As filed with the  Securities  and  Exchange  Commission  on  December  12, 2005
Registration No. 333-129845


                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                   Form S-3/A
                          PRE-EFFECTIVE AMENDMENT NO. 1
             REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933

                               THERMOGENESIS CORP.
             (Exact name of registrant as specified in its charter)

     Delaware                                               94-3018487
     --------                                               ----------
(State or other jurisdiction                             (I.R.S. Employer
of incorporation or organization)                       Identification No.)


                                2711 Citrus Road
                            Rancho Cordova, CA 95742
                                 (916) 858-5100
          (Address and telephone number of principal executive offices)


                                Philip H. Coelho
                             Chief Executive Officer
                                2711 Citrus Road
                            Rancho Cordova, CA 95742
                                 (916) 858-5100
            (Name, address and telephone number of agent for service)


                                   Copies to:

                              David C. Adams, Esq.
                                 Mark Lee, Esq.
                          Bullivant/Houser/Bailey P.C.
                         1331 Garden Highway, Suite 300
                          Sacramento, California 95833
                            Telephone: (916) 442-0400


Approximate  date of commencement of the proposed sale to the public:  From time
to time after the effective date of this Registration Statement.

If the only securities  being registered on this Form are being offered pursuant
to dividend or interest reinvestment plans, please check the following box. [ ]

If any of the  securities  being  registered on this Form are to be offered on a
delayed or continuous  basis  pursuant to Rule 415 under the  Securities  Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment  plans,  check  the  following  box.  |X| 

                                       1


If this Form is filed to register additional securities for an offering pursuant
to Rule 462(b) under the Securities Act, please check the following box and list
the  Securities  Act  registration  statement  number of the  earlier  effective
registration statement for the same offering. [ ]

If this Form is a  post-effective  amendment filed pursuant to Rule 462(c) under
the  Securities  Act,  check  the  following  box and  list the  Securities  Act
registration  statement number of the earlier effective  registration  statement
for the same offering. [ ]

If this Form is a registration statement pursuant to General Instruction I.D. or
a post-effective  amendment thereto that shall become effective upon filing with
the  Commission  pursuant to Rule 462(e)  under the  Securities  Act,  check the
following box. [ ]

If this Form is a  post-effective  amendment to a registration  statement  filed
pursuant to General Instruction I.D. filed to register additional  securities or
additional  classes of securities  pursuant to Rule 413(b) under the  Securities
Act, check the following box. [ ]



                      

                         CALCULATION OF REGISTRATION FEE
========================================= ================= ================ =================== ===================
                                                               Proposed
                                                                maximum       Proposed maximum       Amount of
  Title of each class of securities to      Amount to be    offering price       aggregate          registration
             be registered                registered(1)(3)   per share(2)      offering price          fee(2)
========================================= ================= ================ =================== ===================
Common Stock, $0.001 par value              $75,000,000            -            $75,000,000          $8,827.50
========================================= ================= ================ =================== ===================


(1) There are being registered an indeterminate number of shares of common stock
of the  Registrant  as shall  have an  aggregate  offering  price  not to exceed
$75,000,000.  The proposed  maximum offering price per share shall be determined
from time to time by the  Registrant  in  connection  with the  issuance  of any
securities under the registration statement.  Also includes additional shares of
common stock that may be issued as a result of stock splits,  stock dividends or
similar  transactions.  
(2) Calculated in accordance  with Rule 457(o) of the Securities Act of 1933, as
amended  ("Securities  Act"). A total of $8,827.50 was previously  paid with the
initial filing of this registration  statement.  
(3)  Includes  such  indeterminate  number of shares of common stock as may from
time to  time be  issued  at  indeterminate  prices,  subject  to the  aggregate
threshold dollar amount registered.

The registrant hereby amends this  registration  statement on such date or dates
as may be necessary to delay its effective date until the registrant  shall file
a further amendment which specifically  states that this registration  statement
shall  thereafter  become  effective  in  accordance  with  Section  8(a) of the
Securities Act or until the  registration  statement  shall become  effective on
such date as the Securities and Exchange Commission (the  "Commission"),  acting
pursuant to said Section 8(a), may determine.

                                       2


The  information  in this  prospectus  is not complete  and may be changed.  The
Company may not sell these  securities  until the  registration  statement filed
with the Commission  becomes  effective,  and only then pursuant to a prospectus
supplement.  This prospectus is not an offer to sell these securities and we are
not soliciting an offer to buy these  securities in any state where the offer or
sale  is  not  permitted  or  would  be  unlawful  prior  to   registration   or
qualification under the securities laws of any such state.

                 SUBJECT TO COMPLETION, DATED DECEMBER 12, 2005.

                                   PROSPECTUS

                                   $75,000,000

                               THERMOGENESIS CORP.
                                  Common Stock
                           --------------------------

     By this prospectus,  we may offer a number of shares of our common stock up
to an  aggregate of  $75,000,000  in one or more  transactions.  We will provide
specific terms for any sale of common stock in  supplements to this  prospectus.
You should read this  prospectus and any prospectus  supplement,  as well as the
documents  incorporated  or  deemed  to be  incorporated  by  reference  in this
prospectus,  carefully  before you invest.  This  prospectus  may not be used to
offer and sell the shares of common  stock  unless  accompanied  by a prospectus
supplement.

     Our common stock is traded and listed on the NASDAQ Capital  Market,  under
the symbol  "KOOL." On December 9, 2005,  the last  reported  sale price for the
common stock was $4.05 per share. 

                         -------------------------------

          INVESTING IN OUR COMMON STOCK INVOLVES A HIGH DEGREE OF RISK.
                          SEE "RISK FACTORS" AT PAGE 6.
                         -------------------------------

NEITHER  THE  SECURITIES  AND  EXCHANGE  COMMISSION  NOR  ANY  STATE  SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR DETERMINED IF THIS
PROSPECTUS  IS TRUTHFUL OR  COMPLETE.  ANY  REPRESENTATION  TO THE CONTRARY IS A
CRIMINAL OFFENSE.

THIS  PROSPECTUS  MAY NOT BE USED  TO  CONSUMMATE  SALES  OF  SECURITIES  UNLESS
ACCOMPANIED BY THE APPLICABLE PROSPECTUS SUPPLEMENT.

               The date of this Prospectus is ______________, 2005

                                       3


Table of Contents

                                                                            Page
                                                                            ----
Prospectus Summary............................................................4
Our Business..................................................................6
Risk Factors..................................................................6
Use of Proceeds...............................................................7
Business Description..........................................................7
Description of Common Stock..................................................12
Plan of Distribution.........................................................13
Indemnification of Directors and Officers....................................13
Experts......................................................................14
Legal Matters................................................................14

                               PROSPECTUS SUMMARY

Forward-Looking Statements

     This  Prospectus  contains or  incorporates  "forward-looking  statements,"
which include statements about our business strategy,  our growth strategy,  our
product  development  and  marketing  efforts  and  anticipated  trends  in  our
business,   which  are  not  historical  facts.  We  may  also  make  additional
forward-looking  statements  from time to time in filings  that we make with the
Commission. When we use words like "believe," "expect," "anticipate," "project,"
and  similar   expressions,   this  should  alert  you  that  the  statement  is
forward-looking.  Forward-looking  statements  speak  only as of the date  made,
based largely on expectations.  These  expectations  are generally  subject to a
number  of  risks  and  uncertainties,  some of which  cannot  be  predicted  or
quantified  and which are beyond our control.  Future events and actual  results
may differ materially from the anticipated  results  expressed in,  contemplated
by, or underlying our forward-looking statements. Statements in this Prospectus,
and in documents incorporated by reference into this Prospectus, including those
set forth in the caption "Risk Factors"  describe  factors,  among others,  that
could  contribute  to  or  cause  differences.  In  light  of  these  risks  and
uncertainties,   we  cannot  give  any  assurances   that  the   forward-looking
information will in fact transpire or prove to be accurate in the future.

Summary

     This summary highlights selected  information from this prospectus and does
not contain all of the  information  that is important to you. To understand the
terms  of any  offering  you  should  read  carefully  this  prospectus  and the
prospectus supplement, as well as our periodic reports filed with the Securities
and Exchange Commission that contain more detailed disclosure about our business
and financial performance.

                                       4


About this Prospectus

     This  prospectus  is part of a  registration  statement on Form S-3 that we
filed with the Securities and Exchange  Commission  ("SEC")  utilizing a "shelf"
registration process.  Under this shelf registration process, we may sell shares
of our common stock up to an aggregate of $75,000,000 in one or more  offerings.
This prospectus  provides you with a general description of the shares of common
stock we may offer.  Each time we sell shares of common  stock we will provide a
prospectus  supplement that will contain specific information about the terms of
that  offer  and  sale.  The  prospectus  supplement  may add,  update or change
information  contained  in  this  prospectus.  This  prospectus,  together  with
applicable prospectus supplements, includes all material information relating to
this offering.  Please  carefully  read both this  prospectus and any prospectus
supplement together with any additional information described below under "Where
You Can Find More  Information." THIS PROSPECTUS MAY NOT BE USED TO CONSUMMATE A
SALE OF SECURITIES UNLESS IT IS ACCOMPANIED BY A PROSPECTUS SUPPLEMENT.

Where You Can Find More Information

     Government Filings. We file annual, quarterly and special reports and other
information with the Commission. You may read and copy any document that we file
at the  Securities  and Exchange  Commission's  Public  Reference Room at 100 F.
Street, N.E., Room 1580,  Washington,  D.C. 20549. Please call the Commission at
1-202-551-8090 for more information about the Public Reference Room. Most of our
filings are also  available to you free of charge at the Securities and Exchange
Commission's website at http://www.sec.gov.

     Information Incorporated by Reference. The Commission rules and regulations
allow us to  "incorporate  by reference" the  information  that we file with it.
This means  that we can  disclose  additional  important  information  to you by
referring to those  documents.  The information  incorporated by reference is an
important part of this  Prospectus,  and information  that we file in the future
with the Commission will automatically update and supersede this information. We
have filed the  following  documents  with the  Commission  and the  information
contained in those documents is incorporated by reference into this Prospectus:

     o    Our  Annual  Report on Form 10-K for the  fiscal  year  ended June 30,
          2005, filed on September 12, 2005;

     o    Our Quarterly  Report on Form 10-Q for the quarter ended September 30,
          2005, filed on November 9, 2005;

     o    Our Quarterly  Report on Form 10-Q/A for the quarter  ended  September
          30, 2005, filed on December 12, 2005;

     o    Our Current Reports on Form 8-K filed on November 10, 2005;

     o    Our Current Report on Form 8-K filed on October 18, 2005;

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     o Our Proxy Statement on Schedule 14A filed on September 12, 2005;

     o Our Proxy Statement on Schedule 14A filed on October 31, 2005.

     Please  note that all other  documents  and reports  filed  under  Sections
13(a),  13(c),  14 or 15(d)  of the  Securities  and  Exchange  Act of 1934,  as
amended,  following the date of this  Prospectus and prior to the termination of
this  offering  will  be  deemed  to be  incorporated  by  reference  into  this
Prospectus  and  will be made a part of it from  the  date of  filing  with  the
Commission.

     Filings  made with the  Commission  and other  information  about us can be
found on our website at  www.thermogenesis.com.  We will provide to each person,
including any beneficial owner, who is delivered a prospectus,  a copy of any of
the documents that are  incorporated by reference free of charge.  Send requests
to Matthew Plavan,  Assistant  Corporate  Secretary,  ThermoGenesis  Corp., 2711
Citrus Road, Rancho Cordova, CA 95742 or call (916) 858-5100.

Our Business

     We are a leader in developing and manufacturing  automated blood processing
systems and disposables that enable the  manufacture,  preservation and delivery
of personalized cell and tissue therapy products, or CTT products,  for clinical
use.  Personalized CTT products are created from the blood or tissue of a single
donor and  administered  to that donor or a matched  patient.  Our  systems  and
disposables  are intended  for use by hospitals  and blood banks in two distinct
markets.  In cell  therapy,  our products  automate the  isolation,  capture and
preservation  of stem cells  residing in the blood of the placenta and umbilical
cord,  or cord  blood,  after a baby is  born.  These  cells  are  used to treat
patients  for  leukemia,  lymphoma  and over 60 other life  threatening  genetic
diseases. Cord blood stem cells typically result in reduced immune complications
post transplant compared to adult bone marrow stem cells. In tissue therapy, our
products are used for the rapid  manufacture of autologous  sealants or thrombin
for surgical wound care.  Autologous  sealants have no risk of  contamination by
blood-borne  pathogens  from  other  donors.  We  believe  that our  significant
experience and technical  expertise in developing  proprietary  technologies for
enabling personalized CTT products,  coupled with our relationships with leading
transplant  physicians,  stem cell  researchers and surgeons,  has enabled us to
develop safer, more effective systems for these applications.

     Our  principal  executive  offices are located at 2711 Citrus Road,  Rancho
Cordova, California 95742. Our telephone number is (916) 858-5100.

                                  RISK FACTORS

         Investment in our common stock involves risk. You should carefully
consider the risks we describe in our reports filed with the Securities and
Exchange Commission (SEC) from time to time which are incorporated by reference
herein, and those that may be set forth in any prospectus supplement, before
deciding to invest.

                                       6


                                 USE OF PROCEEDS

     Unless  otherwise  indicated in the applicable  prospectus  supplement,  we
expect to use the net  proceeds  from the sale of our common  stock for  working
capital,  to fund our  future  growth  plans,  and for other  general  corporate
purposes  and  capital  expenditures  related to our  growth.  We may also use a
portion of the net  proceeds  to acquire or invest in  businesses,  products  or
technologies that complement our existing business. From time to time, we engage
in preliminary  discussions and negotiations with various businesses in order to
explore the possibility of strategic partnering or investment.

                           DESCRIPTION OF OUR BUSINESS

BUSINESS OVERVIEW

     We are a leader in developing and manufacturing  automated blood processing
systems and disposables that enable the  manufacture,  preservation and delivery
of personalized cell and tissue therapy products, or CTT products,  for clinical
use.  Personalized CTT products are created from the blood or tissue of a single
donor and  administered  to that donor or a matched  patient.  Our  systems  and
disposables  are intended  for use by hospitals  and blood banks in two distinct
markets.  In cell  therapy,  our products  automate the  isolation,  capture and
preservation  of stem cells  residing in the blood of the placenta and umbilical
cord,  or cord  blood,  after a baby is  born.  These  cells  are  used to treat
patients  for  leukemia,  lymphoma  and over 60 other life  threatening  genetic
diseases. Cord blood stem cells typically result in reduced immune complications
post transplant compared to adult bone marrow stem cells. In tissue therapy, our
products are used for the rapid  manufacture of autologous  sealants or thrombin
for surgical wound care.  Autologous  sealants have no risk of  contamination by
blood-borne  pathogens  from  other  donors.  We  believe  that our  significant
experience and technical  expertise in developing  proprietary  technologies for
enabling personalized CTT products,  coupled with our relationships with leading
transplant  physicians,  stem cell  researchers and surgeons,  has enabled us to
develop safer, more effective systems for these applications.

     In recent years, our revenue  primarily has been generated from the sale of
our  BioArchive  System and  related  disposables.  However,  we  currently  are
developing and commercializing new automated systems that enable the manufacture
of  personalized  CTT  products.  Our products and products in  development  are
described below.

     o    The BioArchive  System is an automated  cryogenic  system used in cell
          therapy to  cryopreserve  and archive cord blood stem cells for future
          transplant.  We have sold 117 BioArchive Systems to date to major cord
          blood banks and stem cell research institutes in 26 countries. We have
          recently  signed a global  distribution  agreement  with GE Healthcare
          granting them exclusive rights to distribute the BioArchive System and
          related disposables.

     o    The AutoXpress, or AXP, System is our newly developed automated system
          and disposable intended for use in cell therapy to isolate and capture
          stem cells from cord blood.  Our  agreement  with GE  Healthcare  also
          grants  them  exclusive  rights  to  distribute  the  AXP  System  and
          disposables,  and we  expect  sales to begin in the first  quarter  of
          2006.

                                       7


     o    The CryoSeal Fibrin Sealant, or FS, System is an automated system used
          in wound care to prepare an  autologous  hemostatic  surgical  sealant
          from a  patient's  own  blood  in  approximately  one  hour.  We  have
          completed  our  pivotal  150  patient  U.S.  clinical  trial  and  are
          preparing  our PMA  submission.  In addition,  we have received the CE
          Mark, and in Japan our  distribution  partner,  Asahi  Medical,  filed
          their PMA equivalent in March 2005.

     o    The Thrombin Processing  Disposable,  or TPD, is used in wound care to
          isolate  activated  thrombin from the  patient's  blood plasma in less
          than 30 minutes.  Thrombin is used as a topical  hemostatic  agent for
          minor bleeding sites, to treat pseudo  aneurysms and to release growth
          factors  from  platelets.  We have signed  non-exclusive  distribution
          agreements  with Biomet,  Medtronic and Asahi Medical for sales of our
          TPD.

BACKGROUND

Industry

     CTT is a broad and rapidly  growing  field of medicine  that  requires  the
collection,  purification,  manipulation,  storage  and  administration  of stem
cells, proteins and growth factors tailored to individual patients. Personalized
CTT  products  are  created  from  the  blood  or  tissue  of  a  single  donor,
administered  to that  donor  or a  matched  patient,  and used  either  for the
treatment of leukemia,  lymphoma and over 60 other life threatening diseases, or
for surgical wound care.  Critical factors in providing  effective  personalized
CTT products are that they be precisely identified and tracked from their source
to the receiving patient and that every  manufacturing step, such as harvesting,
processing,  freezing,  transporting,  matching and  delivering,  preserves  the
viability and sterility of the product.

Cell Therapy

     The human body is  comprised  of cells of specific  tissues,  such as skin,
liver or blood, and stem cells that are not fully  differentiated  into specific
tissues. Until the middle of the 1990s, researchers were familiar with two major
types of stem  cells,  embryonic  stem  cells and  adult  stem  cells.  However,
researchers now know that pluripotent  stem cells are found in cord blood,  bone
marrow and other  tissues  of the body.  Pluripotent  stem cells are  capable of
differentiation into multiple tissues such as bone, blood, nerve and muscle. All
the cells  residing in blood,  which are red cells,  white cells and  platelets,
arise from a  particular  pluripotent  stem cell called the  hematopoietic  stem
cell.  Before the  discovery  that there were  hematopoietic  stem cells in cord
blood,  the placenta and umbilical cord were  routinely  discarded as biological
waste. However,  these hematopoietic stem cells are harvested at no risk or pain
to the donor and can be  preserved  in a cord blood bank for clinical use with a
matched patient on short notice.  Their use also results in a lower incidence of
post-transplant  immune  complications  than  transplants with adult bone marrow
stem cells.

     Hematopoietic stem cell therapy is used to:

     o    replace diseased bone marrow with healthy, functioning bone marrow for
          patients with blood diseases such as aplastic anemia;

                                       8


     o    replace  bone marrow  damaged by high-dose  chemotherapy  or radiation
          therapy  used to treat  patients  with a variety  of  cancers  such as
          leukemia  and  lymphoma;   and  

     o    provide  genetically  healthy  and  functioning  bone  marrow to treat
          patients with genetic diseases such as sickle cell anemia.

     With approximately four million births per year in the United States alone,
cord blood  represents a large,  natural  resource  for use in the  treatment of
malignant  and  genetic  diseases.  Following  the first  successful  cord blood
transplant  performed in 1988,  awareness of the potential  therapeutic value of
cord  blood  stem cells has  increased  and  collection  and  storage  has grown
rapidly.

     We believe the number of units stored will continue to grow, due in part to
the following factors:

     o    increased  awareness about the availability and benefits of preserving
          cord  blood;  
     o    improved technology to harvest the stem cells in a sterile environment
          and maintain their viability for many years; 
     o    growing  endorsement by the medical community;  
     o    new applications for cell therapy; and 
     o    new governmental legislation.

     For example, in May 2005, the House of Representatives  passed the National
Cord Blood Stem Cell Act,  which aims to store  150,000 units of cord blood in a
national  registry.  This Act is still awaiting passage by the Senate, and there
is no certainty that it ultimately will pass and be signed into law. Separately,
the Health Resources and Services  Administration intends to distribute funds to
qualified  cord blood banks to  manufacture  higher quality cord blood units and
develop an improved system for  distributing the units to matched  patients.  We
believe that countries outside the United States are likely to follow this lead.

Wound Care 

     Wound  care  products  are used in a variety  of  surgical  procedures  and
applications to control  bleeding,  close incisions,  assist in tissue fixation,
create a physical  barrier to prevent fluid or air passage and promote  healing.
With the population and number of surgeries  increasing and as physicians  learn
about new  applications  and safer  products,  this  market  has  potential  for
significant  growth.  Wound-healing  products  are  evaluated  by their  safety,
effectiveness,  preparation  time,  ease  of use  and  cost.  In  addition,  the
components of wound care  products are very  important,  as different  materials
have different associated risks and benefits.

     Current wound care products  fall into the  following  general  categories:
topical hemostats, tissue sealants and platelet gels. Topical hemostats are used

                                       9


when  bleeding  is  difficult  to control  with  conventional  methods,  such as
suturing,  stapling or placement of pads or gauze at the bleeding site. The most
common type of topical hemostatic agents are  thrombin-based,  which are used in
procedures  where  blood  clotting  must be  accelerated,  in  order to keep the
surgery site dry. In addition,  thrombin can be used by itself to control  minor
bleeding sites but is insufficient for more persistent bleeding sites.

     The only  thrombin  that is available in the United States as a stand-alone
product is Thrombin JMI(R), a thrombin derived from bovine,  or cow, blood. This
product is only sold in limited  geographies  outside of the United States.  The
market for thrombin is growing  rapidly,  with  Thrombin JMI net sales  totaling
approximately $175 million in the full year ended December 31, 2004, and already
$170 million during the nine months ended September 30, 2005.

     Tissue sealants,  which are more powerful  hemostatic  agents than thrombin
alone,  are made of either  biologic  or  synthetic  material  and are used in a
variety  of  surgical  specialties  and  applications.  They  are  used to close
incisions,  seal and secure skin flaps, reduce adhesions and promote hemostasis.
Fibrin sealants make up the majority of this  sub-segment.  Conventional  fibrin
sealants are derived  from large pools of up to 10,000 units of purchased  human
plasma and often contain animal proteins such as bovine aprotinin. While current
processes attempt to remove all viral and bacterial  pathogens from conventional
sealants,  there have been several recent  peer-reviewed  journal reports of the
transmission  of  Parvovirus  B-19  to  surgical  patients  treated  with  these
sealants.  In  addition,  animal  proteins  are a potential  source of agents of
transmissible  bovine  spongiform  encephalopathy,  which are  resistant  to any
methods of pathogen inactivation available to fractionators at this time.

     Autologous  platelet gels are made by isolating the platelets  from a small
amount of the patient's own blood and combining  those  platelets with thrombin.
Thrombin  causes the release of growth  factors from the  platelets,  which then
trigger wound-healing and tissue repair. Platelet gels increase the quantity and
concentration of growth factors at the wound site.

OUR SOLUTION

     We believe that the use of  personalized  CTT products will increase due to
the growing evidence and  understanding  of their clinical  benefits in treating
disease.  Our  proprietary  systems  and  disposables  enable  the  manufacture,
preservation   and  delivery  of  these   personalized  CTT  products  and  have
substantial  advantages over other products and practices  available  today. Our
products  address a broad range of CTT  applications in two primary areas:  cell
therapy and tissue therapy, including wound care.

Cell Therapy

     Our BioArchive and AXP Systems and  disposables are designed to ensure that
the stem cells in the CTT  products  are  successfully  isolated,  captured  and
preserved such that the cells are fully viable at time of transplant,  which may
be months or years after production.  The BioArchive System,  which can store up
to 3,623 units of cord blood stem cells, is the only fully automated system that
integrates controlled rate freezing, quarantine and long term cryogenic storage.
The  robotic  storage  and  retrieval  of these  stem cell units  improves  cell
viability,  provides precise inventory  management and minimizes the possibility
of human error. To date we have sold 117 BioArchive  Systems to major cord blood

                                       10


stem cell banks and stem cell research centers in 26 countries.  Cord blood stem
cell units  have been used to treat  leukemia,  lymphoma  and over 60 other life
threatening genetic diseases.

     More  recently,  we have  developed  the AXP System,  which  automates  the
isolation and capture of  hematopoietic  stem cells from cord blood into a fixed
20 ml volume.  It includes a compact  battery  powered  device and a proprietary
sterile disposable bag set. The AXP replaces the current clinical process, which
involves more than a dozen manual steps.  The AXP System will provide cord blood
banks  with a  reproducible  and  GMP-compliant  solution  to more  successfully
isolate and capture stem cells with lower labor costs and reduced contamination.
We expect sales of the AXP System and  disposables to begin in the first quarter
of 2006 through our distribution partner, GE Healthcare.

Wound Care

     In the tissue therapy market,  we have developed the CryoSeal FS System and
the TPD.  The  CryoSeal FS System  manufactures  fibrin  sealant in a closed and
sterile  disposable  from a single unit of the  patient's own plasma in about an
hour. In contrast,  conventional fibrin sealants are sourced from large pools of
up to  10,000  or more  units of  purchased  plasma  and  often  include  bovine
proteins,  and thus remain  vulnerable to contamination by infectious  pathogens
residing  anywhere in these  sources.  Our  CryoSeal FS System  prepares the two
interactive  liquid  components  of a  fibrin  sealant:  (1) the  wound  healing
proteins of fibrinogen,  fibronectin,  Factor VIII, von  Willebrands  Factor and
Factor  XIII and (2) the  activating  enzyme,  thrombin.  When  combined  at the
bleeding wound site, the two components form an adhesive gel that stops bleeding
and bonds  tissue.  Once  prepared,  the CryoSeal  fibrin  sealant may be stored
frozen for up to a year or used  immediately as a hemostatic  agent for patients
undergoing surgery.

     Our pivotal  trial,  completed  in July 2005,  was a 150  patient  blinded,
randomized  multi-center clinical trial comparing the performance of CryoSeal FS
to Johnson & Johnson's  Instat(R)  collagen sponge.  The study demonstrated that
patients treated with CryoSeal FS showed statistically  significant reduced time
to  hemostasis  versus  the  Instat(R)  control  group,  with  p=<0.001.  We are
currently  preparing  our PMA for the CryoSeal FS System for  submission  in the
first quarter of 2006.

     We have received the CE Mark,  allowing  sales of the CryoSeal FS System in
Europe,  although  sales into  individual  countries  under  cost  reimbursement
structures often requires the existence of supporting clinical usage within that
country.  We have,  through  our  distribution  partners  in Europe,  undertaken
several  clinical  studies and, upon  completion,  will initiate more aggressive
marketing. In Japan, our distributor, Asahi Medical, has completed enrollment in
their pivotal  clinical  trial and filed their PMA  equivalent in March 2005. In
addition,  several field trials are underway in other  geographies  to provide a
cost justification for reimbursement for use of the product.

                                       11


     The TPD is  incorporated  in the  CryoSeal  FS system  but can be sold as a
stand alone  product.  It is a  disposable  device that  isolates  and  captures
activated  autologous thrombin from approximately 11 ml of patient blood plasma.
Thrombin is used as a topical  hemostatic  agent for minor  bleeding  sites,  to
treat pseudo  aneurysms and to release growth factors from platelets.  We have a
received the CE Mark for TPD and began selling the product in Europe through our
distributor in August 2005. The TPD standalone  product would require a separate
PMA before sale in the United States.

OUR STRATEGY

     We believe our products  significantly  enhance the safety and viability of
CTT products and will  ultimately  expand the use and success of CTT products in
clinical  treatment.  Our strategy is to expand our  leadership  position in the
area of medical devices and disposables for the manufacture and  preservation of
personalized CTT products. The key elements of our strategy include:

     o    Begin commercializing the AXP system through our strategic partner, GE
          Healthcare 
     o    Complete  the PMA and receive  approval  for our CryoSeal FS System in
          the United States and Japan
     o    Expand commercialization of the TPD through Biomet,  Medtronic,  Asahi
          Medical and potentially other distribution partners
     o    Expand  our reach  through  both  sales and  consulting  services  for
          clinical  trials 
     o    Accelerate  our  research  and  development  efforts 
     o    Leverage our installed base to generate additional recurring revenue

CORPORATE INFORMATION

     We are  incorporated  in  Delaware.  Our  principal  executive  offices are
located at 2711 Citrus Road,  Rancho Cordova,  California  95742.  Our telephone
number is (916)  858-5100.  Our  website is  www.thermogenesis.com.  Information
contained on our website is not considered to be a part of this prospectus.

                           DESCRIPTION OF COMMON STOCK

     We are  authorized  by our  Certificate  of  Incorporation,  as amended and
restated,  to issue  80,000,000  shares of common  stock,  $0.001  par value and
2,000,000 shares of preferred  stock,  $0.001 par value. As of December 9, 2005,
there were  45,984,692  shares of common stock and no shares of preferred  stock
outstanding. Holders of shares of common stock have full voting rights, one vote
for each share held of record. Stockholders are entitled to receive dividends as
may be declared by the Board out of funds legally available  therefore and share
pro rata in any  distributions to stockholders  upon  liquidation.  Stockholders
have no conversion, preemptive or subscription rights. All outstanding shares of
common  stock are fully  paid and  nonassessable,  and all the  shares of common
stock issued by us upon the exercise of outstanding  warrants will, when issued,
be fully paid and nonassessable.

                                       12


                              PLAN OF DISTRIBUTION

     We may sell all or a portion of the common stock:

     o    Through one or more  underwriters  or dealers for public  offering and
          sale;

     o    Directly to investors;

     o    Through agents;

     o    Through a block trade in which the broker or dealer  engaged to handle
          the block trade will  attempt to sell the common  stock as agent,  but
          may  position  and  resell a  portion  of the  block as  principal  to
          facilitate the transaction.

     We may  distribute  the  common  stock  from  time  to  time in one or more
transactions at a fixed price or prices, which may be changed from time to time:

     o    at market prices prevailing at the time of sale, or

     o    at negotiated prices.

     We will  describe  the method of  distribution  of the common  stock in the
prospectus supplement.  Underwriters, dealers or agents may receive compensation
in the form of discounts,  concessions or commissions from us or the purchasers,
as  their  agents,  in  connection  with  the sale of the  common  stock.  These
underwriters,  dealers or agents may be considered to be underwriters  under the
Securities Act of 1933, as amended, and, therefore, any discounts,  commissions,
or  profits  on  resale  received  by  such   underwriters  may  be  treated  as
underwriting discounts and commissions.  In the prospectus  supplement,  we will
identify any such  underwriter,  dealer or agent,  and describe the compensation
received  by them  from us.  Any  public  offering  price and any  discounts  or
concessions  allowed or reallowed or paid to dealers may be changed from time to
time.

     Underwriters,  dealers and agents may be entitled to  indemnification by us
against  certain  civil   liabilities,   including   liabilities  under  federal
securities  laws.  Underwriters,  dealers  and agents  also may be  entitled  to
contribution  with respect to payments made by other  underwriters,  dealers and
agents under agreements between us and such underwriters, dealers and agents.

                    INDEMNIFICATION OF DIRECTORS AND OFFICERS

     Our Amended and Restated Certificate of Incorporation provides that we will
indemnify our directors and officers to the fullest extent permitted by the laws
of the state of Delaware. Further, our bylaws, as amended, provide authority for
us to  maintain a liability  insurance  policy that  insures  our  directors  or
officers against any liability incurred by them for service to us.

                                       13


     Insofar as indemnification for liabilities arising under the Securities Act
may be permitted for our directors, officers and controlling persons pursuant to
the foregoing provisions, or otherwise, we have been advised that in the opinion
of the Commission such  indemnification is against public policy as expressed in
the Securities Act and is, therefore,  unenforceable.  In the event that a claim
for  indemnification  against such liabilities  (other than the payment by us of
expenses incurred or paid by a director,  officer,  or controlling person of our
company in the successful defense of any action, suit or proceeding) is asserted
by  such  director,  officer  or  controlling  person  in  connection  with  the
securities being  registered,  unless in the opinion of our counsel,  the matter
has  been  settled  by  controlling  precedent,  we will  submit  to a court  of
appropriate jurisdiction the question of whether such indemnification is against
public policy as expressed in the  Securities  Act and will be governed by final
adjudication.

                                     EXPERT

     The financial  statements of ThermoGenesis Corp. appearing in ThermoGenesis
Corp.'s  Annual  Report (Form 10-K) for the year ended June 30, 2005  (including
the schedule appearing therein) and ThermoGenesis Corp.  management's assessment
of the effectiveness of internal control over financial reporting as of June 30,
2005  included  therein,  have been  audited by Ernst & Young  LLP,  independent
registered  public  accounting  firm,  as set  forth in their  reports  thereon,
included  therein,   and  incorporated  herein  by  reference.   Such  financial
statements and management's  assessment are incorporated  herein by reference in
reliance  upon such  reports  given on the  authority of such firm as experts in
accounting and auditing.

                                  LEGAL MATTERS

     The  validity of the shares of common  stock  offered will be passed by the
law firm of Bullivant/Houser/Bailey P.C., Sacramento, California.

                                       14


                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

Item 14.  Other Expenses of Issuance and Distribution.

     The  following  table  sets forth the costs and  expenses  payable by us in
connection with the issuance and distribution of the securities being registered
hereunder.  All  of  the  amounts  shown  are  estimates,  except  for  the  SEC
registration fee and the NASD fee.

       SEC registration fee                                           $8,827.50
       Printing and engraving expenses                                       $0
       Accounting fees and expenses                                  $20,000.00
       Legal fees and expenses                                       $25,000.00
       Transfer agent and registrar fees                                     $0
       Fees and expenses for qualification under state securities laws       $0
       Engineering fees                                                      $0
       Federal taxes                                                         $0
       State taxes                                                           $0
       Miscellaneous                                                         $0

            Total                                                    $53,827.50
                                                                     ----------

Item 15.  Indemnification of Directors and Officers

     The Company is incorporated  in Delaware.  Under Section 145 of the General
Corporation Law of the State of Delaware,  a Delaware  corporation has the power
to  indemnify  its  directors,  officers,  employees  and agents  from  expenses
(including  attorney's fees),  judgments,  fines, and amounts paid in settlement
actually and reasonably  incurred in connection with a threatened,  pending,  or
completed action, suit or proceeding,  whether civil, criminal,  administrative,
or  investigative,  in which such  person is involved by reason of the fact such
person were or are  directors,  officers,  employees  or agents of the  Company,
provided  that such person  acted in good faith and in a manner that such person
reasonably  believed to be in the best interests of the corporation  and, in the
case of a criminal  proceeding,  such person had no reasonable  cause to believe
his or her  conduct was  unlawful.  Such  person may not be  indemnified  if the
person has been adjudged  liable to the  corporation in the  performance of such
person's duties to the corporation, unless the Court of Chancery or the court in
which  such  action  or  suit  was  brought  determines  that,  in  view  of the
circumstances  of the case,  such  person is fairly and  reasonably  entitled to
indemnity.  To the extent that such person has been  successful on the merits or
otherwise in defense of any proceeding,  the General  Corporate Law of the State
of Delaware  provides  that such person shall be  indemnified  against  expenses
(including attorney's fees) reasonably and actually incurred. The Certificate of

                                       15


Incorporation  and the By-laws of the Company  provide  for  indemnification  of
directors  and  officers  to  the  fullest  extent   permitted  by  the  General
Corporation Law of the State of Delaware.

     The  General  Corporation  Law of the  State of  Delaware  provides  that a
certificate of  incorporation  may contain a provision  eliminating the personal
liability  of a director to the  corporation  or its  stockholders  for monetary
damages for breach of fiduciary duty as a director  provided that such provision
shall not  eliminate or limit the  liability of a director (i) for any breach of
the director's duty of loyalty to the corporation or its stockholders,  (ii) for
acts or omissions not in good faith or which involve intentional misconduct or a
knowing  violation  of law,  (iii) for  unlawful  payment of  dividends or stock
redemption,  or (iv) for any  transaction  from  which the  director  derived an
improper personal benefit. The Company's  Certificate of Incorporation  contains
such a provision.

     We have  indemnification  agreements  with our  officers  and  directors to
indemnify and provide  advanced legal  expenses as permitted by applicable  law,
our Certificate of Incorporation and Bylaws.  Under the agreements,  we will not
indemnify or provide  advance  payments (i) for a violation of Section 16 of the
Securities  Exchange  Act,  (ii) in  connection  with an officer's or director's
takeover  attempt,  or (iii)  any  other  action  where  indemnification  is not
permitted by law. The agreement  terminates  when the officer or director leaves
or is removed from his position.

Item 16. Exhibits

Exhibit No.                     Description
-----------                     -----------

5.1(1)                          Opinion of  Bullivant/Houser/Bailey  P.C. 
23.1                            Consent of Ernst & Young, LLP 
23.2(1)                         Consent of  Bullivant/Houser/Bailey  P.C. 
                                (contained in Exhibit 5.1)
(1)                             Previously filed

Item 17. Undertakings

(a) The undersigned registrant hereby undertakes

     (1)  To file,  during any period in which offers or sales are being made, a
          post-effective amendment to this registration statement:

          (i)  To include any  prospectus  required  by section  10(a)(3) of the
               Securities Act of 1933;

          (ii) To reflect in the  prospectus  any facts or events  arising after
               the  effective  date of the  registration  statement (or the most

                                       16


               recent post-effective  amendment thereof) which,  individually or
               in  the  aggregate,   represent  a  fundamental   change  in  the
               information   set   forth   in   the   registration    statement.
               Notwithstanding the foregoing, any increase or decrease in volume
               of  securities  offered (if the total dollar value of  securities
               offered  would not  exceed  that  which was  registered)  and any
               deviation  from  the low or  high  end of the  estimated  maximum
               offering  range may be reflected in the form of prospectus  filed
               with the Commission pursuant to Rule 424(b) if, in the aggregate,
               the  changes  in volume  and price  represent  no more than a 20%
               change in the maximum  aggregate  offering price set forth in the
               "Calculation  of   Registration   Fee"  table  in  the  effective
               registration statement;

         (iii) To include any material  information with respect to the plan of
               distribution  not  previously   disclosed  in  this  registration
               statement  or any  material  change  to such  information  in the
               registration statement.

     (2)  That,  for  the  purpose  of  determining   any  liability  under  the
          Securities Act of 1933,  each such  post-effective  amendment shall be
          deemed to be a new registration  statement  relating to the securities
          offered  therein,  and the  offering of such  securities  at that time
          shall be deemed to be the initial bona fide offering thereof.

     (3)  To remove from registration by means of a post-effective amendment any
          of  the  securities  being  registered  which  remain  unsold  at  the
          termination of the offering.

     (4)  That,  for the purpose of determining  liability  under the Securities
          Act of 1933 to any purchaser:

          (A)  Each  prospectus  filed  by  the  registrant   pursuant  to  Rule
               424(b)(3)  shall  be  deemed  to  be  part  of  the  registration
               statement as of the date the filed  prospectus was deemed part of
               and included in the registration statement; and

          (B)  Each prospectus  required to be filed pursuant to Rule 424(b)(2),
               (b)(5), or (b)(7)(2),  (b)(5), or (b)(7) of this chapter) as part
               of a registration  statement in reliance on Rule 430B relating to
               an  offering  made  pursuant  to  Rule  415(a)(1)(i),  (vii),  or
               (x)(1)(i),  (vii),  or (x) of this  chapter)  for the  purpose of
               providing  the  information  required  by  section  10(a)  of the
               Securities Act of 1933 shall be deemed to be part of and included
               in the registration  statement as of the earlier of the date such
               form of prospectus is first used after  effectiveness or the date
               of the  first  contract  of sale of  securities  in the  offering
               described  in the  prospectus.  As  provided  in Rule  430B,  for
               liability  purposes  of the issuer and any person that is at that
               date an  underwriter,  such  date  shall  be  deemed  to be a new
               effective  date of the  registration  statement  relating  to the
               securities in the registration statement to which that prospectus
               relates,  and the offering of such  securities at that time shall
               be deemed to be the initial bona fide offering thereof. Provided,

                                       17


               however,  that no  statement  made in  registration  statement or
               prospectus that is part of the registration  statement or made in
               a document  incorporated or deemed incorporated by reference into
               the  registration  statement  or  prospectus  that is part of the
               registration  statement  will,  as to a purchaser  with a time of
               contract  of sale  prior to such  effective  date,  supersede  or
               modify any statement that was made in the registration  statement
               or prospectus that was part of the registration statement or made
               in any such document immediately prior to such effective date.

     (5)  That, for the purpose of determining liability of the registrant under
          the   Securities   Act  of  1933  to  any  purchaser  in  the  initial
          distribution of the securities:

               The undersigned  registrant undertakes that in a primary offering
          of  securities  of  the  undersigned   registrant   pursuant  to  this
          registration statement,  regardless of the underwriting method used to
          sell the securities to the purchaser, if the securities are offered or
          sold  to  such   purchaser   by   means   of  any  of  the   following
          communications,  the  undersigned  registrant  will be a seller to the
          purchaser and will be  considered to offer or sell such  securities to
          such purchaser:

               (i) Any  preliminary  prospectus or prospectus of the undersigned
          registrant  relating to the offering  required to be filed pursuant to
          Rule 424 (ss.230.424 of this chapter);

               (ii)  Any  free  writing  prospectus  relating  to  the  offering
          prepared  by or on behalf  of the  undersigned  registrant  or used or
          referred to by the undersigned registrant;

               (iii) The portion of any other free writing  prospectus  relating
          to the offering containing material  information about the undersigned
          registrant  or  its  securities  provided  by  or  on  behalf  of  the
          undersigned registrant; and

               (iv) Any  other  communication  that is an offer in the  offering
          made by the undersigned registrant to the purchaser.

                                    *  *  *  *  *

(b)  The  undersigned   registrant  hereby  undertakes  that,  for  purposes  of
determining  any liability  under the Securities Act of 1933, each filing of the
registrant's  annual  report  pursuant to section  13(a) or section 15(d) of the
Securities  Exchange  of 1934  Act  that is  incorporated  by  reference  in the
registration  statement  shall  be  deemed  to be a new  registration  statement
relating to the securities  offered herein,  and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.

                                    *  *  *  *  *

(c) The  undersigned  registrant  hereby  undertakes  to  deliver or cause to be
delivered with the prospectus,  to each person to whom the prospectus is sent or
given,  the latest annual  report to security  holders that is  incorporated  by
reference  in  the  prospectus  and  furnished   pursuant  to  and  meeting  the
requirements  of Rule 14a-3 or Rule 14c-3 under the  Securities  Exchange Act of

                                       18


1934;  and,  where  interim  financial  information  required to be presented by
Article 3 of Regulation S-X are not set forth in the prospectus,  to deliver, or
cause to be  delivered to each person to whom the  prospectus  is sent or given,
the latest  quarterly  report that is specifically  incorporated by reference in
the prospectus to provide such interim financial information.

                                    *  *  *  *  *

(d) Insofar as indemnification  for liabilities arising under the Securities Act
of 1933 may be permitted to directors,  officers and controlling  persons of the
registrant pursuant to the foregoing  provisions,  or otherwise,  the registrant
has been advised that in the opinion of the Securities  and Exchange  Commission
such  indemnification  is against  public policy as expressed in the Act and is,
therefore,  unenforceable. In the event that a claim for indemnification against
such liabilities  (other than the payment by the registrant of expenses incurred
or paid by a director,  officer or  controlling  person of the registrant in the
successful  defense of any  action,  suit or  proceeding)  is  asserted  by such
director,  officer or controlling person in connection with the securities being
registered, the registrant will, unless in the opinion of its counsel the matter
has been  settled by  controlling  precedent,  submit to a court of  appropriate
jurisdiction the question whether such  indemnification  by it is against public
policy as expressed in the Act and will be governed by the final adjudication of
such issue.

(e) The undersigned registrant hereby undertakes that:

(1) For purposes of determining  any liability under the Securities Act of 1933,
the  information  omitted  from  the  form of  prospectus  filed as part of this
registration  statement  in reliance  upon Rule 430A and  contained in a form of
prospectus  filed by the registrant  pursuant to Rule 424(b)(1) or (4) or 497(h)
under  the  Securities  Act  shall  be  deemed  to be part of this  registration
statement as of the time it was declared effective.

(2) For the purposes of  determining  any liability  under the Securities Act of
1933, each post-effective  amendment that contains a form of prospectus shall be
deemed to be a new  registration  statement  relating to the securities  offered
therein,  and the offering of such securities at that time shall be deemed to be
the initial bona fide offering thereof.

                                       19


                                   SIGNATURES

     Pursuant to the  requirements of the Securities Act of 1933, the registrant
certifies  that it has  reasonable  grounds to believe  that it meets all of the
requirements  for  filing  this Form  S-3/A and duly  caused  this  registration
statement  to be  signed  on its  behalf  by  the  undersigned,  thereunto  duly
authorized, in Rancho Cordova, California, on December 12, 2005.

                                             THERMOGENESIS CORP.
                                             a Delaware Corporation

                                             /s/ Philip H. Coelho
                                             ----------------------------------
                                             Philip H. Coelho,
                                             Chief Executive Officer
                                             (Principal Executive Officer)

     Known All  Persons  By These  Present,  that each  person  whose  signature
appears below appoints Philip H. Coelho as his true and lawful  attorney-in-fact
and agent,  with full power of substitution,  for him and in his name, place and
stead,  to sign any  amendment  (including  post-effective  amendments)  to this
registration  statement,  and to file the same, with all exhibits  thereto,  and
other  documents  in  connection  therewith,  with the  Securities  and Exchange
Commission,  granting  unto said  attorney-in-fact  and  agent,  full  power and
authority to do and perform each and every act and thing requisite and necessary
to be done in connection  therewith,  as fully to all intents and purposes as he
may do in person, hereby ratifying and confirming all that said attorney-in-fact
and agent or any of them, or of his substitutes,  may lawfully do or cause to be
done by virtue hereof.

     Pursuant  to  the   requirements  of  the  Securities  Act  of  1933,  this
registration  statement  has been signed below by the  following  persons in the
capacities and on the dates indicated:

/s/ Philip H. Coelho                                  Dated:  December 12, 2005
-------------------------------------
Philip H. Coelho,
Chairman and Chief Executive Officer
(Principal Executive Officer)

/s/ Matthew Plavan                                    Dated:  December 12, 2005
-------------------------------------
Matthew Plavan, Chief Financial Officer
(Principal Accounting Officer and
Principal Financial Officer)

/s/ Kevin Simpson                                     Dated:  December 12, 2005
------------------------------------
Kevin Simpson, President,
Chief Operating Officer and Director


                                       20


/s/ Hubert E. Huckel                                 Dated:  December 12, 2005
------------------------------------
Hubert E. Huckel, Director


/s/ Patrick McEnany                                  Dated:  December 12, 2005
------------------------------------
Patrick McEnany, Director


/s/ George Barry                                      Dated:  December 12, 2005
------------------------------------
George Barry, Director


                                       21


                                 EXHIBIT INDEX

Exhibit No.        Description
-----------        -----------

5.1(1)             Opinion of Bullivant/Houser/Bailey
23.1               Consent of Ernst & Young, LLP
23.2(1)            Consent of Bullivant/Houser/Bailey (contained in Exhibit 5.1
(1)                Previously filed


                                       22

                                                                    EXHIBIT 23.1


            CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM


     We consent to the reference to our firm under the caption  "Experts" in the
Registration Statement (Form S-3/A Pre-Effective Amendment No. 1 No. 333-129845)
and  related   Prospectus  of  ThermoGenesis   Corp.  for  the  registration  of
$75,000,000 of its common stock and to the incorporation by reference therein of
our reports dated August 26, 2005, with respect to the financial  statements and
schedule of ThermoGenesis Corp.,  ThermoGenesis Corp. management's assessment of
the  effectiveness  of  internal  control  over  financial  reporting,  and  the
effectiveness  of internal  control over  financial  reporting of  ThermoGenesis
Corp.,  included  in its Annual  Report  (Form 10-K) for the year ended June 30,
2005, filed with the Securities and Exchange Commission.



                                                           /s/ Ernst & Young LLP
                                                         

Sacramento, California
December 12, 2005

                                       23