Pliable silk medical device
An implantable, pliable knitted silk mesh for use in human soft tissue support and repair having a particular knit pattern that substantially prevents unraveling and preserves the stability of the mesh when cut, the knitted mesh including at least two yarns laid in a knit direction and engaging each other to define a plurality of nodes.
1. A process for making a pliable, knitted silk mesh, the process comprising the steps of:
knitting a first silk yarn in a first wale direction using the knit pattern 3/1-1/1-1/3-3/3;
knitting a second silk yarn in a second wale direction using the knit pattern 1/1-1/3-3/3-3/1;
knitting a third silk yarn in a first course direction using the knit pattern 3/3-3/3-5/5-5/5-3/3-3/3-5/5-5/5-1/1-1/1-5/5-5/5-3/3-3/3-5/5-5/5-3/3-3/3-7/7-7/7; and
knitting a fourth silk yarn in a second course direction using the knit pattern 1/1-5/5-5/5-3/3-3/3-5/5-5/5-3/3-3/3-7/7-7/7-3/3-3/3-5/5-5/5-3/3-3/3-5/5-5/5-1/1,
thereby obtaining the pliable knitted silk mesh.
2. The process of claim 1 , wherein (a) the two movements in the wale direction occur on separate needle beds (a knitting machine having two needle beds); and (b) with alternate yarns such as they knit with the opposing needle bed to their location (the front set of yarn knit with the back needle bed and the back set of yarn knit with the front needle bed).
3. The process of claim 1 wherein the silk yarns are made of a nine filaments twisted, and sericin depleted silk fibers.
4. The process of claim 1 wherein the yarns are made with three ends of raw silk yarn twisted together having a finesse of Td 20/22 twisted together in the S direction (clockwise direction of twist) to form a ply with 20 tpi (twist per inch is the number of twist measured in an inch of yarn) and further combining 3 of the resulting ply with 10 tpi in the Z direction(counter clockwise direction of twist).
5. The process of claim 1 , wherein the stitch density or pick count for silk mesh design is about 40 picks per centimeter including the total picks count for the technical front face and the technical back face of the mesh, or equivalently about 20 picks per cm considering only one face of the mesh.
6. A process for making a pliable knitted silk mesh, the process comprising the steps of:
knitting a first silk yarn in a first wale direction using the pattern 3/1-1/1-1/3-3/3;
knitting a second silk yarn in a second wale direction using the pattern 1/1-1/3-3/3-3/1,
knitting a third silk yarn in a first course direction using the pattern 3/3-3/3-5/5-5/5-3/3-3/3-5/5-5/5-1/1-1/1-5/5-5/5-3/3-3/3-5/5-5/5-3/3-3/3-7/7-7/7; and
knitting a fourth silk yarn in a second course direction using the pattern 1/1-5/5-5/5-3/3-3/3-5/5-5/5-3/3-3/3-7/7-7/7-3/3-3/3-5/5-5/5-3/3-3/3-5/5-5/5-1/1,
wherein:
(e) the two movements in the wale direction occur on separate needle beds with alternate yarns and loops that occur on every course are staggered within repeat,
(f) the silk yarns are made of a nine filament, twisted, and sericin depleted silk fibers,
(g) the yarns are made with 3 ends of Td 20/22 raw silk twisted together in the S direction to form a ply with 20 tpi and further combining 3 of the resulting ply with 10 tpi in the Z direction, and
(h) the stitch density or pick count for silk mesh design is 40 picks per centimeter including the total picks count for the technical front face and the technical back face of the mesh, or equivalently 20 picks per cm considering only one face of the mesh,
thereby obtaining the pliable knitted silk mesh.
7. A pliable knitted silk mesh made by:
knitting a first silk yarn in a first wale direction using the pattern 3/1-1/1-1/3-3/3;
knitting a second silk yarn in a second wale direction using the pattern 1/1-1/3-3/3-3/1;
knitting a third silk yarn in a first course direction using the pattern 3/3-3/3-5/5-5/5-3/3-3/3-5/5-5/5-1/1-1/1-5/5-5/5-3/3-3/3-5/5-5/5-3/3-3/3-7/7-7/7; and
knitting a fourth silk yarn in a second course direction using the pattern 1/1-5/5-5/5-3/3-3/3-5/5-5/5-3/3-3/3-7/7-7/7-3/3-3/3-5/5-5/5-3/3-3/3-5/5-5/5-1/1.
8. The pliable knitted silk mesh of claim 7 , wherein the two movements in the wale direction occur on separate needle beds with alternate yarns and loops that occur on every course are staggered within repeat.
9. The pliable knitted silk mesh of claim 7 , wherein the silk yarns are made of a nine filament, twisted, and sericin depleted silk fibers.
10. The pliable knitted silk mesh of claim 7 , wherein the yarns are made with 3 ends of Td 20/22 raw silk twisted together in the S direction to form a ply with 20 tpi and further combining 3 of the resulting ply with 10 tpi in the Z direction.
11. The pliable knitted silk mesh of claim 7 , wherein the stitch density or pick count for silk mesh design is 40 picks per centimeter including the total picks count for the technical front face and the technical back face of the mesh, or equivalently 20 picks per cm considering only one face of the mesh.
12. A pliable knitted silk mesh made by:
knitting a first silk yarn in a first wale direction using the pattern 3/1-1/1-1/3-3/3;
knitting a second silk yarn in a second wale direction using the pattern 1/1-1/3-3/3-3/1;
knitting a third silk yarn in a first course direction using the pattern 3/3-3/3-5/5-5/5-3/3-3/3-5/5-5/5-1/1-1/1-5/5-5/5-3/3-3/3-5/5-5/5-3/3-3/3-7/7-7/7; and
knitting a fourth silk yarn in a second course direction using the pattern 1/1-5/5-5/5-3/3-3/3-5/5-5/5-3/3-3/3-7/7-7/7-3/3-3/3-5/5-5/5-3/3-3/3-5/5-5/5-1/1; wherein:
(a) the two movements in the wale direction occur on separate needle beds with alternate yarns and loops that occur on every course are staggered within repeat;
(b) the silk yarns are made of a nine filament, twisted, and sericin depleted silk fibers;
(c) the yarns are made with 3 ends of Td 20/22 ra(g) w silk twisted together in the S direction to form a ply with 20 tpi and further combining 3 of the resulting ply with 10 tpi in the Z direction; and
(d) the stitch density or pick count for silk mesh design is 40 picks per centimeter including the total picks count for the technical front face and the technical back face of the mesh, or equivalently 20 picks per cm considering only one face of the mesh.