SEC Form 4

FORM 4		UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940	OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response: 0.5
	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person* William Blair Capital Management VII, LLC (Last) (First) (Middle) 303 W. MADISON SUITE 2500 (Street) CHICAGO IL 60606 (City) (State) (Zip)	2. Issuer Name and Ticker or Trading Symbol CRYOCOR INC [ CRYO ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) Director X 10% Owner Officer (give title below) Other (specify below)
	3. Date of Earliest Transaction (Month/Day/Year) 04/24/2007
	4. If Amendment, Date of Original Filed (Month/Day/Year)	6. Individual or Joint/Group Filing (Check Applicable Line) Form filed by One Reporting Person X Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock(1)	04/24/2007		P		96,553(2)	A	$5.14	1,944,961(3)	I	See footnote(4)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Common Stock Warrants (Right to Buy)	$5.14	04/24/2007		P		53,103(5)		10/24/2007	04/24/2012	Common Stock	53,103	$0.07	53,103	I	See footnote(4)

1. Name and Address of Reporting Person* William Blair Capital Management VII, LLC (Last) (First) (Middle) 303 W. MADISON SUITE 2500 (Street) CHICAGO IL 60606 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* William Blair Capital Management VII, LP (Last) (First) (Middle) 303 W. MADISON SUITE 2500 (Street) CHICAGO IL 60606 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* BLAIR WILLIAM CAPITAL PARTNERS VII QP LP (Last) (First) (Middle) 303 W. MADISON SUITE 2500 (Street) CHICAGO IL 60606 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* BLAIR WILLIAM CAPITAL PARTNERS VII LP (Last) (First) (Middle) 303 W. MADISON SUITE 2500 (Street) CHICAGO IL 60606 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

Explanation of Responses:

1. The Designated Filer is executing this report on behalf of William Blair Capital Management VII, L.L.C., William Blair Capital Management VII, L.P., William Blair Capital Partners VII QP, L.P. and William Blair Capital Partners VII, L.P. (collectively, the "Reporting Persons"), each of whom has authorized it to do so; each of the Reporting Persons disclaim beneficial ownership of the Issuer?s securities to the extent it exceeds such Reporting Person?s pecuniary interest.

2. The shares were purchased as follows: 92,970 by William Blair Capital Partners VII QP, L.P. and 3,583 shares by William Blair Capital Partners VII, L.P.

3. Represents 1,872,801 shares beneficially owned by William Blair Capital Partners VII QP, LP and 72,160 shares beneficially owned by William Blair Capital Partners VII LP.

4. The amount shown in Table I represents the beneficial ownership of the Issuer?s equity securities by William Blair Capital Partners VII QP, L.P. and William Blair Capital Partners VII, L.P., a portion of which may be deemed attributable to William Blair Capital Management VII, L.L.C. and William Blair Capital Management VII, L.P., because William Blair Capital Management VII, L.P. is the general partner of William Blair Capital Partners VII QP, L.P. and William Blair Capital Partners VII, L.P. and William Blair Capital Management VII, L.L.C. is the general partner of William Blair Capital Management VII, L.P. The actual pro rata portion of such beneficial ownership that may be deemed attributable to such Reporting Person is not readily determinable because it is subject to several variables.

5. The warrants were purchased and are held as follows: 51,133 by William Blair Capital Partners VII QP, L.P. and 1,970 by William Blair Capital Partners VII, L.P.

Remarks:

	Arda M. Minocherhomjee, Managing Director of William Blair Capital Management VII, L.L.C.	04/26/2007
	Arda M. Minocherhomjee, Managing Director of William Blair Capital Management VII, L.L.C., the general partner of William Blair Capital Management VII, L.P	07/14/2005
	Arda M. Minocherhomjee, Managing Director of William Blair Capital Management VII, L.L.C., the general partner of William Blair Capital Management VII, L.P., the general partner of William Blair Capital Partners VII QP, L.P.	07/14/2005
	Arda M. Minocherhomjee, Managing Director of William Blair Capital Management VII, L.L.C., the general partner of William Blair Capital Management VII, L.P., the general partner of William Blair Capital Partners VII, L.P.	07/14/2005
	** Signature of Reporting Person	Date
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* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
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