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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
764579	Cas Medical Systems Inc	CASM	Surgical & Medical Instruments & Apparatus (3841)	061123096

Insiders

Cik	Name	Reported Address	Director	Officer	Large Shareholder	Other
1009258	Deerfield Management Co	780 Third Avenue, 37Th Floor New York NY 10017	No	No	Yes	Yes
1010823	L.p. Mgmt Deerfield	780 Third Avenue, 37Th Floor New York NY 10017	No	No	Yes	Yes
1352546	E James Flynn	780 Third Avenue, 37Th Floor New York NY 10017	No	No	Yes	Yes
1354395	Deerfield Special Situations Fund, L.p.	780 Third Avenue, 37Th Floor New York NY 10017	No	No	Yes	Yes
1565099	Deerfield Special Situations International Master Fund, L.p.	780 Third Avenue, 37Th Floor New York NY 10017	No	No	Yes	Yes

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2015-01-01	1,443,200	$1.65	3,200,000	No	4	P	Indirect	Through Deerfield Special Situations, L.P.
Common Stock	Disposition	2015-01-01	1,443,200	$1.65	0	No	4	S	Indirect	Through Deerfield Special Situations International Master Fund, L.P.

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	P	Indirect	Through Deerfield Special Situations, L.P.
No	4	S	Indirect	Through Deerfield Special Situations International Master Fund, L.P.

Footnotes

In connection with the consolidation of the Funds (as defined below), effective January 1, 2015, the assets of Deerfield Special Situations International Master Fund, L.P. (including the shares listed in column 4 of Table I above) were transferred to Deerfield Special Situations Fund, L.P.
This Form 4 is being filed by the undersigned as well as the entities listed on the Joint Filer Information Statement attached as an exhibit hereto (the "Reporting Persons"). Deerfield Mgmt, L.P. is the general partner of Deerfield Special Situations Fund, L.P. and Deerfield Special Situtations International Master Fund, L.P. (collectively, the "Funds"). Deerfield Management Company, L.P. is the investment manager of the Funds. James E. Flynn is the sole member of the general partner of each of Deerfield Mgmt, L.P. and Deerfield Management Company, L.P.
In accordance with Instruction 5 (b)(iv) to Form 3, the entire amount of the Issuer's securities held by the Funds is reported herein. For purposes of Section 16 of the Securities Exchange Act of 1934, each Reporting Person disclaims beneficial ownership of any such securities, except to the extent of his/its indirect pecuniary interest therein, if any, and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of such securities for purposes of Section 16 or otherwise.