Thin soft tissue support mesh

• US 6,042,592 A
• Filed: 08/04/1997
• Issued: 03/28/2000
• Est. Priority Date: 08/04/1997
• Status: Expired due to Term

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Meadox Medicals, Inc. (Boston Scientific Corporation)
• Inventors: Schmitt, Peter J.
• Primary Examiner(s): Buiz, Michael
• Assistant Examiner(s): Trinh, Vikki
• Application Number:
  US08/905,529
• Time in Patent Office: 967 Days
• Field of Search: 606/198, 606/151, 606/154, 606/195, 606/192, 606/108, 606/191, 606/200, 606/213, 623/1, 623/11, 623/12, 604/365
• US Class Current: 606/151
• CPC Class Codes: A61F 2/0063 Implantable repair or support meshes, e.g. hernia meshes
• CPC Class Codes: A61F 2002/0068 having a special mesh pattern
• CPC Class Codes: A61F 2250/0067 Means for introducing or releasing pharmaceutical products into the body

Abstract

A soft and pliable surgical support mesh exhibiting increased resistance to inhabitation of infectious matter. The mesh includes a support trellis formed of multifilament yarns wherein the interstitial voids located between the filaments of said yarns are enclosed within an infection-impervious matrix. The meshes may be designed to be extremely thin yet retain the requisite strength for repairing soft tissue, which allows for a low profile when folded for delivery.

Claims

1. A soft and pliable soft tissue mesh, comprising;

a support trellis formed of multifilament yarns having splayed filaments encapsulated within an infection-impervious matrix whereby each multifilament yarn includes interstitial voids located between the splayed filaments of each of said yarns, and wherein said interstitial voids are enclosed within said matrix.

2. The mesh according to claim 1, wherein said matrix exteriorly surrounds said yarns and is formed of a material having a Young'"'"'s modulus lower than the Young'"'"'s modulus of the material forming the filaments of said yarns.

3. The mesh according to claim 2, wherein said matrix penetrates into said yarn to substantially fill the interstitial voids located therein.

4. The mesh according to claim 3, wherein said matrix is formed from a polymer selected from the group consisting of polyester, polypropylene, polyethylene, polyurethane, poly(meth) acrylate, and copolymers thereof.

5. The mesh according to claim 1, wherein said yarns are formed of a plurality of bi-component filaments each having a flexible core and a fusible sheath surrounding said core, and wherein said sheath has a fusing temperature lower than the melting temperature of said core whereby said sheaths fuse together to enclose said interstitial voids upon heating of said trellis.

6. The mesh according to claim 5, wherein said core is formed of a polyethylene terephthalate polyester and said sheath is formed of a polyethylene terephthalate/isophthalate copolyester.

7. The mesh according to claim 1, wherein said multifilament yarns overlap one another at regularly-spaced junctions to form said support trellis, and wherein said overlapping yarns are adhered to one another at said junctions to enhance ravel resistance of said mesh.

8. The mesh according to claim 1, wherein said matrix is drug permeable, and wherein a medicinal drug is incorporated into said matrix for release into the body of a patient after implantation of said mesh therein.

9. The mesh according to claim 1, wherein the mesh has a thickness less than about 0.20 millimeters.

10. The mesh according to claim 1, wherein said multifilament yarns have no twist imparted thereto.

24. The soft tissue mesh of claim 1, wherein said trellis defines pores having a size in the range of 50 microns to 400 microns.

25. The soft tissue mesh of claim 7, wherein said trellis has a thickness in the range of 0.05 millimeters to 0.50 millimeters.

26. The soft tissue mesh of claim 7, wherein said trellis has a thickness less than 0.20 millimeters.

27. The soft tissue mesh of claim 26 wherein said trellis is sufficiently thin to permit insertion into a trocar having a diameter of about 5 millimeters or less.

28. The soft tissue mesh of claim 27, wherein said is mesh is heat conditioned for a sufficient time at a sufficient temperature to effectuate a shape-memory in an unfurled state.

29. The soft tissue mesh of claim 27, wherein said mesh includes yarns or filaments made from a shape-memory material.

11. A method of producing a soft and pliable surgical mesh exhibiting increased resistance to inhabitation of infectious matter from a support trellis formed of multifilament yarns having splayed filaments and defining interstitial voids between the splayed filaments of each yarn, comprising:

encapsulating said multifilament yarns within an infection-impervious matrix whereby the interstitial voids located between the splayed filaments of said yarns are enclosed within said matrix.

12. The method according to claim 11, wherein said encapsulating step includes the step of applying a resin to the exterior of said yarns prior to the forming of said trellis.

13. The method according to claim 12, wherein said resin is applied to the exterior of said trellis in sufficient quantity and for a sufficient period of time to allow said resin to penetrate into said yarn and substantially fill said voids.

14. The method according to claim 11, wherein said encapsulating step includes the step of applying a resin to the exterior of said yarns subsequent to the forming of said trellis.

15. The method according to claim 14, wherein said resin is applied to the exterior of said trellis in sufficient quantity and for a sufficient period of time to allow said resin to penetrate into said yarn and substantially fill said voids.

16. The method according to claim 11, wherein said yarns are formed of a plurality of bi-component filaments each having a flexible core and a fusible sheath surrounding said core, and wherein said encapsulating step includes the step of heating said trellis above the fusing temperature of said sheaths whereby said sheaths fuse together.

17. The method according to claim 16, wherein said fusing step is accomplished by application of thermal or light wave radiation to said trellis.

18. The method according to claim 11, further comprising the step of incorporating a medicinal drug into said matrix for release therefrom after implantation of said mesh into the body of a patient.

19. The method according to claim 11, further comprising the step of sealing said encapsulated trellis in a sterile package.

20. The method according to claim 11, further comprising the step of applying a compressive force to press the mesh to a desired thickness.

21. A method of repairing a damaged portion of a patient'"'"'s body, comprising:

providing a soft tissue mesh, said mesh comprising a support trellis formed of multifilament yarns having splaved filaments and defining interstitial voids between the splayed filaments of each yarn, wherein said interstitial voids are encapsulated within an infection-impervious matrix whereby said mesh is soft and pliable while simultaneously exhibiting a resistance to inhabitation of infectious matter;

accessing said damaged portion of said body; and

implanting said surgical mesh in said body to reinforce said damaged portion and allowing said mesh to assimilate into said body.

22. The method according to claim 21, wherein said yarns are formed of a plurality of bi-component filaments each having a flexible core and a fusible sheath surrounding said core, and wherein said providing step includes the step of heating said trellis above the fusing temperature of said sheaths whereby said sheaths fuse together to encapsulate said cores.

23. The method according to claim 21, wherein said matrix is drug permeable, and wherein a medicinal drug is incorporated into said matrix for release into the body of a patient after implantation of said mesh therein.