Prosthetic knit for treating prolapses

• US 20080208360A1
• Filed: 02/15/2008
• Published: 08/28/2008
• Est. Priority Date: 02/15/2007
• Status: Active Grant

• Current Assignee: Sofradim Production
• Original Assignee: Sofradim Production
• Inventors: Meneghin, Alfredo, Therin, Michel, Lecuivre, Julie, Spinnler, Linda
• Granted Patent: US 8,181,491 B2
• Time in Patent Office: Days
• US Class Current: 623/23.75
• CPC Class Codes: A61F 2/0045 Support slings
• CPC Class Codes: D04B 21/12 characterised by thread material
• CPC Class Codes: D04B 21/20 specially adapted for knitting articles of particular configuration
• CPC Class Codes: D10B 2509/08 Hernia repair mesh

Abstract

The present invention relates to a prosthetic open knit fabric (10) made as a single piece, based on an arrangement consisting of several sets of yarns of a biocompatible polymer material, comprising, continuously in the direction of production of the knit, a central strip (11) and two lateral strips (12), one on each side of the central strip, characterized in that it comprises one or more set(s) of pillar stitch yarns defining a pillar stitch pattern, the said one or more set(s) of pillar stitch yarns extending across the entire width of the central strip (11) and of the lateral strips (12) and together forming a first threading across the width of the central strip and a second threading across the width of the lateral strips, the said first and second threading being different, and at least two partial weft stitching sets.

The present invention also relates to a method of producing such a knit fabric and to an implant for supporting prolapses obtained from such a knit fabric.

Claims

1. Prosthetic open knit fabric made as a single piece, based on an arrangement consisting of several sets of yarns of a biocompatible polymer material, comprising, continuously in the direction of production of the knit fabric, a central strip and two lateral strips, one on each side of the central strip, characterized in that it comprises one or more sets of pillar stitch yarns defining a pillar stitch pattern, the said one or more set(s) of pillar stitch yarns extending across the entire width of the central strip and of the lateral strips and together forming a first threading across the width of the central strip and a second threading across the width of the lateral strips, the said first and second threadings being different, and at least two partial weft stitching sets of yarns.

2. Knit fabric according to claim 1, characterized in that the second threading is denser than the first threading.

3. Knit fabric according to claim 1, characterized in that it comprises two sets of pillar stitch yarns, a first set of pillar stitch yarns and a second set of pillar stitch yarns, the said first set of pillar stitch yarns extending across the entire width of the central strip and of the lateral strips, the said second set of pillar stitch yarns extending only across the width of each of the lateral strips.

4. Knit fabric according to claim 1, characterized in that the said two partial weft stitching sets of yarns extend across the entire width of the central strip and of the lateral strips of the knit fabric.

5. Knit fabric according to claim 1, characterized in that the breaking load of the knit fabric in the longitudinal direction for each lateral strip is greater than or equal to 50 N.

6. Knit fabric according to claim 5, characterized in that the said breaking load ranges from 70 to 90 N.

7. Knit fabric according to claim 1, characterized in that the elongation at break of the knit fabric in the longitudinal direction for each lateral strip ranges from 25% to 70%.

8. Knit fabric according to claim 7, characterized in that the said elongation at break ranges from 50% to 70%.

9. Knit fabric according to claim 1, characterized in that the breaking load of the knit fabric in the transverse direction for the central strip is greater than or equal to 60 N.

10. Knit fabric according to claim 9, characterized in that the said breaking load ranges from 70 to 90 N.

11. Knit fabric according to claim 1, characterized in that the elongation at 30 N of the knit fabric in the transverse direction for the central strip ranges from 30% to 50%.

12. Knit fabric according to claim 11, characterized in that the said elongation ranges from 40% to 50%.

13. Knit fabric according to claim 1, characterized in that the said central strip comprises pores the mean width of which varies from 2.5 mm to 3 mm and the mean height of which varies from 1.6 mm to 1.9 mm.

14. Knit fabric according to claim 1, characterized in that it is produced from yarns, monofilaments or multifilaments of a biocompatible polymer material chosen from polypropylene, polyester, polyamide and blends thereof.

15. Knit fabric according to claim 1, characterized in that the said central strip is covered on at least one side with a bioresorbable material.

16. Knit fabric according to claim 1, characterized in that it further comprises at least one radiopaque yarn.

21. Supporting implant for treating prolapses, obtained by cutting a prosthetic knit fabric according to claim 1.

22. Implant according to claim 21, comprising a central support and at least two extending arms extending from the said central support, characterized in that the said extending arms are cut in the longitudinal direction of the lateral strips of the knit fabric and the central support is cut from within the central strip of the knit fabric.

23. Implant according to claim 22, characterized in that it comprises at least four extending arms.

24. Implant according to claim 22, characterized in that the breaking load of the implant in the longitudinal direction for each extending arm is greater than or equal to 50 N.

25. Implant according to claim 24, characterized in that the said breaking load ranges from 70 to 90 N.

26. Implant according to claim 22, characterized in that the elongation at break of the implant in the longitudinal direction for each extending arm ranges from 25% to 70%.

27. Implant according to claim 26, characterized in that the said elongation at break ranges from 50% to 70%.

28. Implant according to claim 21, characterized in that the breaking load of the implant in the longitudinal direction of the central support is greater than or equal to 60 N.

29. Implant according to claim 28, characterized in that the said breaking load ranges from 70 to 90 N.

30. Implant according to claim 21, characterized in that the elongation at 30 N of the implant in the longitudinal direction of the central support ranges from 30% to 50%.

31. Implant according to claim 30, characterized in that the said elongation ranges from 40% to 50%.

32. Implant according to claim 22, characterized in that the central support comprises pores the mean width of which varies from 2.5 mm to 3 mm and the mean height of which varies from 1.6 mm to 1.9 mm.

33. Implant according to claim 22, characterized in that the said central support is covered on at least one side with a bioresorbable material.

34. Implant according to claim 22, characterized in that it further comprises at least one radiopaque yarn.

35. Method of producing a supporting implant for treating prolapses comprising at least one central support and at least two extending arms extending from this central support, characterized in that it comprises the following steps:

sourcing a prosthetic knit fabric according to claim 1,

cutting the said central support from within the central strip of the said knit fabric,

unravelling or cutting the said extending arms from within the said lateral strips of the said knit fabric, in the longitudinal direction of the said lateral strips.

17. Method of producing a prosthetic open knit fabric made as a single piece, based on an arrangement consisting of several sets of yarns of a biocompatible polymer material, comprising, continuously in the direction of production of the knit fabric, a central strip and two lateral strips, one on each side of the central strip, characterized in that it comprises the following step:

producing a knit fabric on a warp knitting machine or Raschel knitting machine in one or more sets of pillar stitch yarns defining a pillar stitch pattern, the said one or more set(s) of pillar stitch yarns being threaded continuously or partly threaded across the entire width of the lateral strips and of the central strip on one or more guide bar(s) and together forming a first threading across the width of the central strip and a second threading across the width of the lateral strips, the said first and second threadings being different, and at least two additional sets of yarns, each of the additional sets being obtained from a guide bar, the pattern chart used for knitting the yarns of each additional lap leading to a partial weft stitching pattern.

18. Method according to claim 17, characterized in that use is made of two sets of pillar stitch yarns, a first set of pillar stitch yarns and a second set of pillar stitch yarns, the said first set of pillar stitch yarns being threaded continuously along a first guide bar across the entire width of the lateral strips and of the central strip and the said second set of pillar stitch yarns being partly threaded on a second guide bar across only the width of each of the lateral strips.

19. Method according to claim 17, characterized in that, when the width of the warp knitting machine or Raschel knitting machine allows several knit fabrics to be knitted side by side, a lateral strip of a first knit fabric lies adjacent to a lateral strip of a second knit fabric so the partial weft stitching sets of the said first and second knit fabrics have a pattern such that for any pillar stitch yarn separating two adjacent lateral strips, any weft yarn of the said partial weft stitching sets approaching the said pillar stitch yarn makes a U-turn at this pillar stitch yarn.

20. Supporting implant for treating prolapses, obtained by unravelling the pillar stitch yarns of knit fabrics obtained according to claim 19 and cutting the central strip of the said knit fabric or knit fabrics.