POWER OF ATTORNEY

         Know all by these presents, that the undersigned hereby constitutes and
appoints Laura M. Medina and Christopher R. Letang the undersigned's true and
lawful attorney-in fact and agent to:

                  (1) execute for and on behalf of the undersigned, an officer,
         director or holder of 10% of more of a registered class of securities
         of Intraop Medical Corporation (the "Company"), Forms 3, 4 and 5 in
         accordance with Section 16(a) of the Securities Exchange Act of 1934,
         as amended (the "Exchange Act") and the rules thereunder;

                  (2) do and perform any and all acts for and on behalf of the
         undersigned that may be necessary or desirable to complete and execute
         such Form 3, 4 or 5, complete and execute any amendment or amendments
         thereto, and timely file such forms or amendments with the United
         States Securities and Exchange Commission and any stock exchange or
         similar authority; and

                  (3) take any other action of any nature whatsoever in
         connection with the foregoing which, in the opinion of such
         attorney-in-fact, may be of benefit, in the best interest of, or
         legally required by, the undersigned, it being understood that the
         documents executed by such attorney-in-fact on behalf of the
         undersigned pursuant to this Power of Attorney shall be in such form
         and shall contain such terms and conditions as such attorney-in-fact
         may approve in such attorney-in-fact's discretion.

         The undersigned hereby grants to such attorney-in-fact full power and
authority to do and perform any and every act and thing whatsoever requisite,
necessary, or proper to be done in the exercise of any of the rights and powers
herein granted, as fully to all intents and purposes as the undersigned might or
could do if personally present, with full power of substitution or revocation,
hereby ratifying and confirming all that such attorney-in-fact, or such
attorney-in-fact's substitute or substitutes, shall lawfully do or cause to be
done by virtue of this power of attorney and the rights and powers herein
granted. The undersigned acknowledges that the foregoing attorney-in-fact, in
serving in such capacity at the request of the undersigned, is not assuming, nor
is the Company assuming, any of the undersigned's responsibilities to comply
with Section 16 of the Exchange Act.

         This Power of Attorney shall remain in full force and effect until the
earliest to occur of (a) the undersigned ceasing to be required to file Forms 3,
4 and 5 with respect to the undersigned's holdings of and transactions in
securities issued by the Company, (b) revocation by the undersigned in a signed
writing delivered to the foregoing attorney-in-fact or (c) such attorney-in-fact
ceasing to be employed by Lacuna, LLC, or its successor, or Cooley Godward
Kronish LLP.

         IN WITNESS WHEREOF, the undersigned has cause this Power of Attorney to
be executed as of this 27th day of August, 2007.

                            LACUNA VENTURE FUND LLLP

                                By: Lacuna Ventures GP LLLP, its general partner
                                By: Lacuna, LLC, its general partner


                            By: /s/ J.K. Hullett
                                ------------------------------------------------
                                J.K. Hullett, Member







                                POWER OF ATTORNEY

         Know all by these presents, that the undersigned hereby constitutes and
appoints Laura M. Medina and Christopher R. Letang the undersigned's true and
lawful attorney-in fact and agent to:

                  (1) execute for and on behalf of the undersigned, an officer,
         director or holder of 10% of more of a registered class of securities
         of Intraop Medical Corporation (the "Company"), Forms 3, 4 and 5 in
         accordance with Section 16(a) of the Securities Exchange Act of 1934,
         as amended (the "Exchange Act") and the rules thereunder;

                  (2) do and perform any and all acts for and on behalf of the
         undersigned that may be necessary or desirable to complete and execute
         such Form 3, 4 or 5, complete and execute any amendment or amendments
         thereto, and timely file such forms or amendments with the United
         States Securities and Exchange Commission and any stock exchange or
         similar authority; and

                  (3) take any other action of any nature whatsoever in
         connection with the foregoing which, in the opinion of such
         attorney-in-fact, may be of benefit, in the best interest of, or
         legally required by, the undersigned, it being understood that the
         documents executed by such attorney-in-fact on behalf of the
         undersigned pursuant to this Power of Attorney shall be in such form
         and shall contain such terms and conditions as such attorney-in-fact
         may approve in such attorney-in-fact's discretion.

         The undersigned hereby grants to such attorney-in-fact full power and
authority to do and perform any and every act and thing whatsoever requisite,
necessary, or proper to be done in the exercise of any of the rights and powers
herein granted, as fully to all intents and purposes as the undersigned might or
could do if personally present, with full power of substitution or revocation,
hereby ratifying and confirming all that such attorney-in-fact, or such
attorney-in-fact's substitute or substitutes, shall lawfully do or cause to be
done by virtue of this power of attorney and the rights and powers herein
granted. The undersigned acknowledges that the foregoing attorney-in-fact, in
serving in such capacity at the request of the undersigned, is not assuming, nor
is the Company assuming, any of the undersigned's responsibilities to comply
with Section 16 of the Exchange Act.

         This Power of Attorney shall remain in full force and effect until the
earliest to occur of (a) the undersigned ceasing to be required to file Forms 3,
4 and 5 with respect to the undersigned's holdings of and transactions in
securities issued by the Company, (b) revocation by the undersigned in a signed
writing delivered to the foregoing attorney-in-fact or (c) such attorney-in-fact
ceasing to be employed by Lacuna, LLC, or its successor, or Cooley Godward
Kronish LLP.

         IN WITNESS WHEREOF, the undersigned has cause this Power of Attorney to
be executed as of this 27th day of August, 2007.

                                       LACUNA VENTURES GP LLLP

                                           By: Lacuna, LLC, its general partner


                                       By: /s/ J.K. Hullett
                                           -------------------------------------
                                           J.K. Hullett, Member




                                POWER OF ATTORNEY

         Know all by these presents, that the undersigned hereby constitutes and
appoints Laura M. Medina and Christopher R. Letang the undersigned's true and
lawful attorney-in fact and agent to:

                  (1) execute for and on behalf of the undersigned, an officer,
         director or holder of 10% of more of a registered class of securities
         of Intraop Medical Corporation (the "Company"), Forms 3, 4 and 5 in
         accordance with Section 16(a) of the Securities Exchange Act of 1934,
         as amended (the "Exchange Act") and the rules thereunder;

                  (2) do and perform any and all acts for and on behalf of the
         undersigned that may be necessary or desirable to complete and execute
         such Form 3, 4 or 5, complete and execute any amendment or amendments
         thereto, and timely file such forms or amendments with the United
         States Securities and Exchange Commission and any stock exchange or
         similar authority; and

                  (3) take any other action of any nature whatsoever in
         connection with the foregoing which, in the opinion of such
         attorney-in-fact, may be of benefit, in the best interest of, or
         legally required by, the undersigned, it being understood that the
         documents executed by such attorney-in-fact on behalf of the
         undersigned pursuant to this Power of Attorney shall be in such form
         and shall contain such terms and conditions as such attorney-in-fact
         may approve in such attorney-in-fact's discretion.

         The undersigned hereby grants to such attorney-in-fact full power and
authority to do and perform any and every act and thing whatsoever requisite,
necessary, or proper to be done in the exercise of any of the rights and powers
herein granted, as fully to all intents and purposes as the undersigned might or
could do if personally present, with full power of substitution or revocation,
hereby ratifying and confirming all that such attorney-in-fact, or such
attorney-in-fact's substitute or substitutes, shall lawfully do or cause to be
done by virtue of this power of attorney and the rights and powers herein
granted. The undersigned acknowledges that the foregoing attorney-in-fact, in
serving in such capacity at the request of the undersigned, is not assuming, nor
is the Company assuming, any of the undersigned's responsibilities to comply
with Section 16 of the Exchange Act.

         This Power of Attorney shall remain in full force and effect until the
earliest to occur of (a) the undersigned ceasing to be required to file Forms 3,
4 and 5 with respect to the undersigned's holdings of and transactions in
securities issued by the Company, (b) revocation by the undersigned in a signed
writing delivered to the foregoing attorney-in-fact or (c) such attorney-in-fact
ceasing to be employed by Lacuna, LLC, or its successor, or Cooley Godward
Kronish LLP.

         IN WITNESS WHEREOF, the undersigned has cause this Power of Attorney to
be executed as of this 27th day of August, 2007.

                                      LACUNA, LLC


                                      By: /s/ J.K. Hullett
                                          --------------------------------------
                                          J.K. Hullett, Member