Cardiothoracic Systems Inc Watch

from SC 13D 1 page Exhibit 1 Joint Filing Agreement Pursuant to Rule 13d-1(f)(1) Under the Securities Exchange Act of 1934, the Undersigned Hereby Agree That Only One Statement Containing the Information Required by Schedule 13d (Or Any Amendment Thereof) Need Be Filed on Their Behalf With Respect to the Beneficial Ownership of Any Equity Securities of Cardiothoracic Systems, Inc. or Any Subsequent Acquisitions or Dispositions of Equity Securities of Cardiothoracic Systems, Inc. by Any of the Undersigned. Date: June 11, 1998 Vertical Fund Associates, L.P. By: The Vertical Group, L.P. General Partner By: /S/ John E. Runnells John E. Runnells General Partner Vertical Life Sciences, L.P. By: The Vertical Group, L.P. General Partner By: /S/ John E. Runnells John E. Runnells General Partner /S/ Stephen D. Baksa Stephen D. Baksa -10

from SC 13G/A 1 page <page> Exhibit 1 Agreement Pursuant to Rule 13d-1(f) Promulgated Pursuant to the Securities Exchange Act of 1934, as Amended, the Undersigned Agree That the Attached Schedule 13g Is Being Filed on Behalf of Each of the Undersigned. February 13, 1998 Venrock Associates By: /S/ Ted H. McCourtney Ted H. McCourtney General Partner February 13, 1998 Venrock Associates II, L.P. By: /S/ Ted H. McCourtney Ted H. McCourtney General Partner February 13, 1998 General Partners /S/Mark W. Bailey Mark W. Bailey /S/ Anthony B. Evnin Anthony B. Evnin /S/ David R. Hathaway David R. Hathaway /S/ Patrick F. Latterell Patrick F. Latterell /S/ Ted H. McCourtney Ted H. McCourtney /S/ Ray A. Rothrock Ray A. Rothrock /S/ Kimberley A. Rummelsburg Kimberley A. Rummelsburg /S/ Anthony Sun Anthony Sun