Suture fabricated from syndiotactic polypropylene

• US 5,269,807 A
• Filed: 08/27/1992
• Issued: 12/14/1993
• Est. Priority Date: 08/27/1992
• Status: Expired due to Term

• Current Assignee: United States Surgical Corporation (Medtronic Plc)
• Original Assignee: United States Surgical Corporation (Medtronic Plc)
• Inventors: Liu, Cheng-Kung
• Primary Examiner(s): Green, Randall L.
• Assistant Examiner(s): PREBILIC, PAUL B
• Application Number:
  US07/936,571
• Time in Patent Office: 474 Days
• Field of Search: 623/11, 623/13, 606/228, 606/230, 606/231, 606/151, 526/351, 525/240, 525/196, 525/221
• US Class Current: 606/228
• CPC Class Codes: A61L 17/04 Non-resorbable materials
• CPC Class Codes: D01F 6/06 from polypropylene

Abstract

A suture is manufactured from a syndiotactic polypropylene, advantageously by a melt extrusion (spinning) procedure. The suture exhibits greater flexibility than a comparable suture manufactured from isotactic polypropylene.

Claims

1. A medical device comprising a suture-needle combination comprising a filament spun from a composition containing a syndiotactic polypropylene.

2. The medical device of claim 1 wherein the syndiotactic polypropylene possesses a weight average molecular weight of from about 15,000 to about 400,000 and a number average molecular weight of from about 4,000 to about 200,000.

3. The medical device of claim 1 wherein the syndiotactic polypropylene possesses a weight average molecular weight of from about 20,000 to about 300,000 and a number average molecular weight of from about 5,000 to about 150,000.

4. The medical device of claim 1 wherein the syndiotactic polypropylene possesses a melt flow index in g/10 min of from about 2 to about 20.

5. The medical device of claim 1 wherein the syndiotactic polypropylene possesses a melt flow index in g/10 min of from about 3 to about 5.

6. The medical device of claim 1 wherein the syndiotactic polypropylene is present in a blend with at least one other thermoplastic polymer.

7. The medical device of claim 6 wherein the blend contains from about 5 to about 95 weight percent syndiotactic polypropylene, the balance of the blend containing the other thermoplastic polymer or polymers.

8. The medical device of claim 6 wherein the blend contains from about 20 to 80 weight percent syndiotactic polypropylene, the balance of the blend containing the other thermoplastic polymer or polymers.

9. The medical device of claim 1 wherein the syndiotactic polypropylene is present in a blend with isotactic polypropylene, stactic polypropylene or both.

10. The medical device of claim 9 wherein the blend contains from about 5 to about 95 weight percent syndiotactic polypropylene, the balance of the blend containing isotactic polypropylene, atactic polypropylene or both.

11. The medical device of claim 9 wherein the blend contains from about 20 to about 80 weight percent syndiotactic polypropylene, the balance of the blend containing isotactic polypropylene, atactic polypropylene or both.

12. A method of suturing tissue comprising:

providing a suture-needle combination wherein said suture comprises a filament spun from a composition containing a syndiotactic polypropylene;

piercing tissue with said needle of said suture-needle combination; and

drawing said suture at least partially through the tissue.