Electrochemical and chemical methods for production of non-thrombogenic metal heart valves

• US 4,038,702 A
• Filed: 09/21/1973
• Issued: 08/02/1977
• Est. Priority Date: 09/21/1973
• Status: Expired due to Term

• Current Assignee: Philip Nicholas Sawyer
• Original Assignee: Philip Nicholas Sawyer
• Inventors: Sawyer, Philip Nicholas
• Primary Examiner(s): Edmundson, F.C.
• Application Number:
  US05/399,466
• Time in Patent Office: 1,411 Days
• Field of Search: 3/1, 3/1.4, 3/1.5, 204/129.1
• US Class Current: 623/66.1
• CPC Class Codes: A61F 2/0077 Special surfaces of prostheses, e.g. for improving ingrowth A61F2/30767 takes precedence
• CPC Class Codes: Y10S 623/921 Blood vessel

Abstract

A method of improving the operation of metal heart valves according to which the surfaces of the heart valves are treated to render more negative the electrochemical potential which the valve part will exhibit in blood or a blood-like fluid and to minimize surface non-homogenities. The surface is treated to obtain more particularly a negative surface potential which is generally homogeneous and more negative than + 100 mv/NHE by chemical polishing, electrochemical polishing or cathode cleaning.

Claims

1. A prosthetic device including a metal structure having a metal surface, said metal surface being electrolytically treated to render more negative and homogeneous the electrochemical surface charge which the surface will exhibit in blood or a bloodlike fluid, said surface having thereon no more than two foreign particles not exceeding 0.5 microns in maximum diameter per 25 square microns of surface.