FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person * MPM BIOVENTURES II QP LP   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) (Last) (First) (Middle) C/O MPM ASSET MANAGEMENT, 111 HUNTINGTON AVE., 31ST FLOOR 3. Date of Earliest Transaction (Month/Day/Year) 07/13/2005 (Street) BOSTON, MA 02199 4. If Amendment, Date 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 (City) (State) (Zip) 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 07/13/2005   P   180,000 (1) A $ 11 180,000 I See footnote (1)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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 Underlying Securities (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 of Derivative Security: 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

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
MPM BIOVENTURES II QP LP C/O MPM ASSET MANAGEMENT 111 HUNTINGTON AVE., 31ST FLOOR BOSTON, MA 02199		X
MPM BIOVENTURES II LP C/O MPM ASSET MANAGEMENT 111 HUNTINGTON AVE., 31ST FLOOR BOSTON, MA 02199		X
MPM BIOVENTURES II GMBH & CO PARALLEL BETEILIGUNGS KG C/O MPM ASSET MANAGEMENT 111 HUNTINGTON AVE., 31ST FLOOR BOSTON, MA 02199		X
MPM ASSET MANAGEMENT INVESTORS 2000B LLC C/O MPM ASSET MANAGEMENT 111 HUNTINGTON AVE., 31ST FLOOR BOSTON, MA 02199		X
MPM ASSET MANAGEMENT II LP C/O MPM ASSET MANAGEMENT 111 HUNTINGTON AVE., 31ST FLOOR BOSTON, MA 02199		X
MPM ASSET MANAGEMENT II LLC C/O MPM ASSET MANAGEMENT 111 HUNTINGTON AVE., 31ST FLOOR BOSTON, MA 02199		X
GADICKE ANSBERT C/O MPM ASSET MANAGEMENT 111 HUNTINGTON AVE., 31ST FLOOR BOSTON, MA 02199		X
STEINMETZ MICHAEL C/O MPM ASSET MANAGEMENT 111 HUNTINGTON AVE., 31ST FLOOR BOSTON, MA 02199		X
GALAKATOS NICHOLAS C/O MPM ASSET MANAGEMENT 111 HUNTINGTON AVE., 31ST FLOOR BOSTON, MA 02199		X
EVNIN LUKE C/O MPM ASSET MANAGEMENT 111 HUNTINGTON AVE., 31ST FLOOR BOSTON, MA 02199		X

Signatures

By Luke Evnin, manager of MPM Asset Management II LLC, the general partner of MPM Asset Management II, L.P., the general partner of MPM BioVentures II-QP, L.P /s/ Luke Evnin		07/14/2005
**Signature of Reporting Person		Date
By Luke Evnin, manager of MPM Asset Management II LLC, the general partner of MPM Asset Management II, L.P.,the general partner of MPM BioVentures II, L.P /s/ Luke Evnin		07/14/2005
**Signature of Reporting Person		Date
By Luke Evnin, member of MPM Asset Management II LLC, the general partner of MPM Asset Management II, L.P.,the general partner of MPM BioVentures GmbH and Co. Parallel-Beteiligungs KG /s/ Luke Evnin		07/14/2005
**Signature of Reporting Person		Date
By Luke Evnin, manager of MPM Asset Management Investors 2000B LLC /s/ Luke Evnin		07/14/2005
**Signature of Reporting Person		Date
By Luke Evnin, manager of MPM Asset Management II LLC, the general partner of MPM Asset Management II, L.P. /s/ Luke Evnin		07/14/2005
**Signature of Reporting Person		Date
By Luke Evnin, manager of MPM Asset Managment II, LLC /s/ Luke Evnin		07/14/2005
**Signature of Reporting Person		Date
/s/ Ansbert Gadicke		07/14/2005
**Signature of Reporting Person		Date
/s/ Michael Steinmetz		07/14/2005
**Signature of Reporting Person		Date
/s/ Nicholas Galakatos		07/14/2005
**Signature of Reporting Person		Date
/s/ Luke Evnin		07/14/2005
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	The shares were purchased and are held as follows: 121,176 by MPM BioVentures II-QP, L.P. ("BV II QP"), 13,374 by MPM BioVentures II, L.P. ("BV II"), 2,790 by MPM Asset Management Investors 2000B LLC ("AM 2000B") and 42,660 by MPM BioVentures GmbH & Co. Parallel-Beteiligungs KG ("BV KG"). MPM Asset Management II, L.P. ("AM II GP") and MPM Asset Management II LLC ("AM II LLC") are the direct and indirect general partners of BV II QP, BV II and BV KG. Luke Evnin, Ansbert Gadicke, Nicholas Galakatos, Michael Steinmetz and Kurt Wheeler are the members of AM II LLC and AM 2000B Each member of the group disclaims beneficial ownership of the securities except to the extent of its pecuniary interest therein.

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