Ownership Submission
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 *
KINDERHOOK PARTNERS, LP
  2. Issuer Name and Ticker or Trading Symbol
Patient Safety Technologies, Inc [PSTX.OB]
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)
TWO EXECUTIVE DRIVE, SUITE 585
3. Date of Earliest Transaction (Month/Day/Year)
05/18/2012
(Street)

FORT LEE, NJ 07024
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 05/18/2012   P   1,045,642 A $ 1.4 7,359,435 D (1) (2)  

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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
KINDERHOOK PARTNERS, LP
TWO EXECUTIVE DRIVE
SUITE 585
FORT LEE, NJ 07024
    X    
KINDERHOOK CAPITAL MANAGEMENT, LLC
TWO EXECUTIVE DRIVE
SUITE 585
FORT LEE, NJ 07024
    X    
KINDERHOOK GP LLC
TWO EXECUTIVE DRIVE
SUITE 585
FORT LEE, NJ 07024
    X    
Shah Tushar
TWO EXECUTIVE DRIVE
SUITE 585
FORT LEE, NJ 07024
    X    
CLEARMAN STEPHEN J
TWO EXECUTIVE DRIVE
SUITE 585
FORT LEE, NJ 07024
    X    

Signatures

 /s/ Stephen J. Clearman, Managing Member of Kinderhook Partners, LP   05/18/2012
**Signature of Reporting Person Date

 /s/ Stephen J. Clearman, Managing Member of Kinderhook GP, LLC   05/18/2012
**Signature of Reporting Person Date

 /s/ Stephen J. Clearman, Managing Member of Kinderhook Capital Management, LLC   05/18/2012
**Signature of Reporting Person Date

 /s/ Tushar Shah   05/18/2012
**Signature of Reporting Person Date

 /s/ Stephen J. Clearman   05/18/2012
**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) Kinderhook Capital Management, LLC serves as the investment adviser to Kinderhook Partners, LP (the "Partnership"). Kinderhook GP, LLC serves as the general partner (the "General Partner") to the Partnership, and Messrs. Tushar Shah and Stephen Clearman serve as the General Partner's managing members, responsible for making investment decisions with respect to the Partnership and, as a result, Mr. Shah and Mr. Clearman may be deemed to control such entities. In addition, Mr. Shah and Mr. Clearman are responsible for making investment decisions with respect to Kinderhook Capital Management, LLC. Accordingly, Mr. Shah and Mr. Clearman may be deemed to have a beneficial interest in the shares of Common Stock by virtue of their indirect control of the Partnership's, the General Partner's and Kinderhook Capital Management, LLC's power to vote and/or dispose of the shares of Common Stock.
(2) Mr. Shah and Mr. Clearman disclaim beneficial ownership of the shares of Common Stock except to the extent of his respective pecuniary interest, if any, therein. Kinderhook Capital Management, LLC specifically disclaims beneficial ownership in the shares of Common Stock reported herein except to the extent of its pecuniary interest therein, if any.

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