Radio-opaque markers for pyrolytic carbon prosthetic members

• US 4,349,498 A
• Filed: 01/16/1981
• Issued: 09/14/1982
• Est. Priority Date: 01/16/1981
• Status: Expired due to Term

• Current Assignee: Carbomedics Inc. (Snia SpA)
• Original Assignee: Carbomedics Inc. (Snia SpA)
• Inventors: Bokros, Jack C., Haubold, Axel D., Slivenko, Victor, Ellis, Willard H.
• Primary Examiner(s): Silverberg, Sam
• Application Number:
  US06/225,804
• Time in Patent Office: 606 Days
• Field of Search: 3/1.5, 264/81, 264/162, 264/219, 264/275
• US Class Current: 264/81
• CPC Class Codes: A61B 90/39 Markers, e.g. radio-opaque or breast lesions markers
• CPC Class Codes: A61F 2/2403 with pivoting rigid closure members check valves with hinged closure members in general F16K15/03
• CPC Class Codes: A61F 2/2409 Support rings therefor, e.g. for connecting valves to tissue annuloplasty rings A61F2/2442
• CPC Class Codes: A61F 2/30721 Accessories
• CPC Class Codes: A61F 2002/3008 radio-opaque, e.g. radio-opaque markers
• CPC Class Codes: A61F 2250/0098 radio-opaque, e.g. radio-opaque markers
• CPC Class Codes: A61F 2310/00161 Carbon; Graphite
• CPC Class Codes: A61L 27/08 Carbon ; Graphite

Abstract

Methods are provided for fully encasing radio-opaque markers in pyrocarbon prosthetic members. Inserts having a pyrolytic carbon portion joined to a radio-opaque marker are affixed to a mandrel surface so that the marker extends thereabove. Pyrocarbon sufficient to encase the marker is deposited on the mandrel, the mandrel is removed, and the deposited layer of pyrocarbon is finished to form the prosthetic member.

Claims

1. A method of forming a pyrolytic carbon prosthetic member having a marker fully encased in pyrolytic carbon comprising;

forming a mandrel having a surface on which the member is to be created,

providing an insert having a pyrolytic carbon portion and a marker joined thereto,

affixing said insert to said mandrel so that said marker extends above said surface, and

depositing pyrolytic carbon on said mandrel to a desired thickness sufficient to fully encase said marker therein,

removing undesired portions of said mandrel, and

finishing the shaping of said deposited pyrolytic carbon to form a prosthetic member.

2. A method according to claim 1 wherein said marker is radio-opaque.

3. A method according to claim 1 wherein said marker is vapor deposited on a surface of said carbon portion.

4. A method according to claim 1 wherein said prosthetic member is a heart valve member.

5. A method according to claim 1 including providing a cavity in said mandrel surface and securing said carbon portion of said insert in said cavity.

6. A method according to claim 1 wherein said insert is formed by depositing pyrolytic carbon on said marker.

7. A method according to claim 1 wherein said surface is substantially the mirror image of at least a portion of said prosthetic member.

8. A method of forming a pyrolytic carbon prosthetic member having an elongated marker fully encased in pyrocarbon comprising;

forming a mandrel having a surface on which the member is to be created,

affixing spaced-apart pyrocarbon plugs to said mandrel so that portions thereof extend above said surface,

supporting an elongated marker between said plugs,

depositing pyrolytic carbon on said mandrel to a desired thickness sufficient to fully encase said marker therein,

removing unwanted portions of said mandrel, and

finishing the shaping of said deposited pyrolytic carbon to form a prosthetic member.

9. A method according to claim 8 including removing a portion of said pyrolytic carbon plugs as a part of said finish shaping.

10. A method according to claim 8 wherein said surface is substantially the mirror image of at least a portion of said prosthetic member.