Method for forming a base knit suitable for manufacturing hernia prostheses and hernia prostheses obtained therefrom
AssigneeSofradim Production
InventorsXavier Couderc, Jeremy Miralles, Camille Noorman
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Abstract
The invention relates to a method for forming a prosthetic base knit (1) made of two parallel sheets of porous knits, namely a first sheet (2) of porous knit and a second sheet of porous knit, said two parallel sheets being joined together in a discrete manner by a plurality of connecting porous knits (4) spaced apart from each other. The invention further relates to a method for manufacturing H-shaped prostheses for hernia repair from said base knit thus obtained and to the prostheses obtained therefrom.
Claims27
A method for forming a prosthetic base knit made of two parallel sheets of porous knits including a first sheet of porous knit and a second sheet of porous knit, said two parallel sheets being joined together in a discrete manner by a plurality of connecting porous knits spaced apart from each other, said method comprising knitting on a warp knitting machine comprising two needle-beds, a first needle-bed comprising a first guide bar B1, a second guide bar B2 and a third guide bar B3, and a second needle-bed comprising a fourth guide bar B4, a fifth guide bar B5 and a sixth guide bar B6, yarns of a biocompatible material threaded in said first, second, third, fifth and sixth guide bars, according to a defined knitting pattern unit along a warp direction of the warp knitting machine, said pattern unit corresponding to a total number of N courses ranging from 1 to N completed along said warp direction on each needle-bed, and according to a defined threading-in unit repeated along a width of the warp knitting machine, said threading-in unit corresponding to a total number T of needles along said width of the warp knitting machine, N and T being each an integer equal or greater than 5, wherein
- i) for needles ranging from 1 to T and courses ranging from 1 to N, patterns followed by the first and second guide bars produce on the first needle-bed said first sheet of porous knit under a form of a first bidimensional porous knit, and patterns followed by the fifth and sixth guide bars produce on the second needle-bed said second sheet of porous knit under a form of a second bidimensional porous knit, and
- ii) for needles ranging from w to z, where 1≤w<z≤T and courses ranging from x to y, where 1≤x<y=N, where w, x, y, and z are integers, the pattern followed by the third guide bar B3 produces a connecting porous knit joining said first sheet of porous knit to said second sheet of porous knit, under a form of a three-dimensional porous knit, made of yarns threaded in said third guide bar B3 crossing from the first needle-bed to the second needle-bed and vice-versa.
A method for manufacturing a H-shaped prosthesis suitable for hernia repair, said H-shaped prosthesis comprising an underlay layer, an onlay layer and a connector, said method comprising the following steps:
- Aº) producing a prosthetic base knit made of two parallel sheets of porous knits including a first sheet of porous knit and a second sheet of porous knit, said two parallel sheets being joined together by a connecting porous knit, said method comprising knitting on a warp knitting machine comprising two needle-beds, a first needle-bed comprising a first guide bar B1, a second guide bar B2 and a third guide bar B3, and a second needle-bed comprising a fourth guide bar B4, a fifth guide bar B5 and a sixth guide bar B6, yarns of a biocompatible material threaded in said first, second, third, fifth and sixth guide bars, according to a defined pattern unit corresponding to a total number of N courses ranging from 1 to N completed along said warp direction on each needle-bed, and according to a defined threading-in unit corresponding to a total number T of needles along said width of the machine, N and T being each an integer equal or greater than 5, wherein
- i) for needles ranging from 1 to T and courses ranging from 1 to N, knitting patterns followed by the first and second guide bars produce on the first needle-bed said first sheet of porous knit under the form of a first bidimensional porous knit, and knitting patterns followed by the fifth and sixth guide bars produce on the second needle-bed said second sheet of porous knit under the form of a second bidimensional porous knit, and
- ii) ii) for needles ranging from w to z, where 1≤w<z≤T and courses ranging from x to y, where 1≤x<y≤N, where w, x, y, and z are integers, a knitting pattern followed by the third guide bar B3 produces a connecting porous knit joining said first sheet of porous knit to said second sheet of porous knit, under the form of a three-dimensional porous knit, made of yarns threaded in said third guide bar B3 crossing from the first needle-bed to the second needle-bed and vice-versa,
- Bº) cutting the first sheet of porous knit to a shape and dimension desired for forming said underlay layer,
- Cº) cutting the second sheet of porous knit to a shape and dimension desired for forming said onlay layer, said connecting knit forming said connector.
Dependencies are inferred from the claim text.