Composite bioabsorbable materials and surgical articles made thereform

• US 5,578,046 A
• Filed: 05/12/1995
• Issued: 11/26/1996
• Est. Priority Date: 02/10/1994
• Status: Expired due to Term

• Current Assignee: United States Surgical Corporation (Medtronic Plc)
• Original Assignee: United States Surgical Corporation (Medtronic Plc)
• Inventors: Jiang, Ying, Roby, Mark S., Liu, Cheng-Kung, Bennett, Steven L., Stevenson, Richard P., Pietrangeli, Jeffrey P.
• Primary Examiner(s): Buiz, Michael Powell
• Assistant Examiner(s): SCHMIDT, JEFFREY
• Application Number:
  US08/439,830
• Time in Patent Office: 564 Days
• Field of Search: 606/151, 606/154, 606/76, 606/77, 606/69, 623/13, 623/16, 602/904, 602/43
• US Class Current: 606/151
• CPC Class Codes: A61L 15/26 Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives thereof A61L15/225 takes precedence
• CPC Class Codes: A61L 15/64 specially adapted to be resorbable inside the body
• CPC Class Codes: A61L 17/04 Non-resorbable materials
• CPC Class Codes: A61L 17/12 Homopolymers or copolymers of glycolic acid or lactic acid
• CPC Class Codes: A61L 17/145 Coating
• CPC Class Codes: A61L 27/48 with macromolecular fillers
• CPC Class Codes: A61L 27/58 Materials at least partially resorbable by the body
• CPC Class Codes: A61L 31/129 containing macromolecular fillers
• CPC Class Codes: A61L 31/148 Materials at least partially resorbable by the body
• CPC Class Codes: C08L 67/04 Polyesters derived from hydroxycarboxylic acids, e.g. lactones C08L67/06 takes precedence
• CPC Class Codes: Y10S 602/904 Film-forming bandage material

Abstract

The present invention relates to composite materials having a core portion formed from a first bioabsorbable material and at least one shell portion of a second bioabsorbable material joined to the core portion. The first and second bioabsorbable materials have different rates of bioabsorption. In a preferred embodiment, the core portion is coextruded with the shell portion to form a composite filament or sheet. The materials of the present invention may be used as sutures or formed into medical devices or surgical articles for implantation within a living organism.

Claims

1. A composite bioabsorbable sheet implantable within a living organism comprising:

a core portion formed from a first bioabsorbable material;

a shell portion substantially coextensive with and substantially surrounding said core portion to form a composite sheet, said shell portion formed from a second bioabsorbable material;

said first and second bioabsorbable materials having different rates of bioabsorption.

2. A bioabsorbable sheet as recited in claim 1 wherein said first bioabsorbable material has a greater rate of bioabsorption than said second bioabsorbable material.

3. A bioabsorbable sheet as recited in claim 1 wherein said first and second bioabsorbable materials are selected from polymers, copolymers, block copolymers, and mixtures and blends of polymers, copolymers, and block copolymers of glycolide, glycolic acid, lactide, lactic acid, caprolactone, dioxanone, trimethylene carbonate, dimethyl trimethylene carbonate, 1,3 dioxane-2-one, and 1,4 dioxane-2-one.

4. A bioabsorbable sheet comprising:

a core portion formed from a first bioabsorbable material;

a shell portion joined to said core portion, said shell portion formed from a second bioabsorbable material;

said first and second bioabsorbable materials having different rates of bioabsorption, wherein said shell portion comprises a first shell portion formed from said second bioabsorbable material and a second shell portion formed from a third bioabsorbable material, said second and third bioabsorbable materials having different rates of bioabsorption.