Method for making a reinforced absorbable multilayered fabric for use in medical devices

• US 20060258995A1
• Filed: 04/10/2006
• Published: 11/16/2006
• Est. Priority Date: 10/20/2004
• Status: Abandoned Application

• Current Assignee: Ethicon Incorporated (Johnson & Johnson)
• Original Assignee: Ethicon Incorporated (Johnson & Johnson)
• Inventors: Shetty, Dhanuraj S., Gorman, Anne Jessica, Moore, Jerry, Kalirai, Simmi, Pendharkar, Sanyog Manohar
• Application Number:
  US11/401,030
• Publication Number:
  US 20060258995A1
• Time in Patent Office: Days
• US Class Current: 604/307
• CPC Class Codes: A61L 27/18 obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
• CPC Class Codes: A61L 27/20 Polysaccharides
• CPC Class Codes: B32B 2250/02 2 layers
• CPC Class Codes: B32B 2250/20 All layers being fibrous or filamentary
• CPC Class Codes: B32B 2262/0276 Polyester fibres
• CPC Class Codes: B32B 2262/04 Cellulosic plastic fibres, e.g. rayon
• CPC Class Codes: B32B 2262/06 Vegetal fibres
• CPC Class Codes: B32B 2307/726 Permeability to liquids, absorption
• CPC Class Codes: B32B 2459/00 Nets, e.g. camouflage nets
• CPC Class Codes: B32B 2535/00 Medical equipment, e.g. bandage, prostheses or catheter
• CPC Class Codes: B32B 5/022 Non-woven fabric
• CPC Class Codes: B32B 5/024 Woven fabric
• CPC Class Codes: B32B 5/026 Knitted fabric
• CPC Class Codes: B32B 5/06 characterised by a fibrous or filamentary layer mechanically connected, e.g. by needling to another layer, e.g. of fibres, of paper
• CPC Class Codes: B32B 5/10 characterised by a fibrous or filamentary layer reinforced with filaments
• CPC Class Codes: B32B 5/26 another layer next to it also being fibrous or filamentary relative arrangement of fibres or filaments of different layers B32B5/12
• CPC Class Codes: B32B 9/04 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to a glass layer B32B17/06; layered products with at least two ceramic layers composed mainly of ceramic B32B18/00
• CPC Class Codes: C08L 1/04 Oxycellulose; Hydrocellulose , e.g. microcrystalline cellulose
• CPC Class Codes: C08L 67/04 Polyesters derived from hydroxycarboxylic acids, e.g. lactones C08L67/06 takes precedence

Abstract

The present invention is directed to a method of making a multilayered fabric comprising a first absorbable nonwoven fabric and one or more a second absorbable woven or knitted fabric.

Claims

1. A method for making a multilayered fabric comprising a first absorbable nonwoven fabric and one or more second absorbable woven or knitted fabric, comprising the steps of.

(a) crimping absorbable polymer fibers or yams in the range of about 10 to 30 crimps per inch;

(b) cutting the crimped fibers or yams to a staple length between about 0.1 and 2.5 inch;

(c) carding the staple to form the first absorbable nonwoven fabric;

(d) attaching the first absorbable nonwoven fabric to the second absorbable woven or knitted fabric;

while

(e) controlling the humidity of the environment for step (c) to about 20 to 60%, at a room temperature of about 15 to 24°

C.

2. The method of claim 1, wherein the humidity of the environment for step (c) is from about 40 to 60%, at a room temperature of about 15 to 24°

C.

3. The method of claim 1, where the first absorbable nonwoven fabric comprises fibers comprised of aliphatic polyester polymers or copolymers of one or more monomers selected from the group consisting of lactic acid, lactide (including L-, D-, meso and D, L mixtures), glycolic acid, glycolide, ε

-caprolactone, p-dioxanone, and trimethylene carbonate.

4. The method of claim 3, where the first absorbable nonwoven fabric comprises glycolide/lactide copolymer.

5. The method of claim 4, where the second absorbable woven or knitted fabric comprises oxidized polysaccharides.

6. The method of claim 5, where the second absorbable woven or knitted fabric comprises oxidized cellulose.

7. The method of claim 6, where the second absorbable woven or knitted fabric comprises oxidized regenerated cellulose.

8. The method of claim 7, where the second absorbable woven or knitted fabric is an absorbable knitted fabric comprising oxidized regenerated cellulose.

9. The method of claim 1, where the first absorbable nonwoven fabric comprises glycolide/lactide copolymer, and the second absorbable woven or knitted fabric comprises oxidized regenerated cellulose.

10. The method of claim 9, where the first absorbable nonwoven fabric comprises staple having a length from about 0.75 to 2.5 inches.

11. The method of claim 10, where the first absorbable nonwoven fabric comprises staple having a length from about 1.5 to 2.0 inches.

12. The method of claim 9, where the first absorbable nonwoven fabric comprises a copolymer of glycolide and lactide, in an amount ranging from about 70 to 95% by molar basis of glycolide and the remainder lactide, and the second absorbable woven or knitted fabric comprises oxidized regenerated cellulose.

13. The method of claim 12, where the first absorbable nonwoven fabric is attached to the second absorbable woven or knitted fabric via needlepunching.

14. The method of claim 13, where the absorbable polymer fibers range from about 0.001 to 4 denier per filament.

15. The method of claim 14, where the first absorbable nonwoven fabric has a basis weight of about 0.01 to 0.2 g/in²;

and the second absorbable woven or knitted fabric has a basis weight of about 0.001 to 0.2 g/in².

16. The method of claim 1, wherein the first absorbable nonwoven fabric is attached to the second absorbable woven or knitted fabric via needlepunching.