Surgical mesh having ingrowth-preventing coating on one side thereof, and method for making the same
A coated surgical mesh, the coated surgical mesh comprising: a surgical mesh, the surgical mesh comprising a first surface and a second surface; and a tissue ingrowth-preventing coating applied to the second surface of the surgical mesh; wherein the tissue ingrowth-preventing coating penetrates a controllable amount part way through the surgical mesh.
1 . A method of manufacturing a coated surgical mesh, said method comprising:
providing a silicone applicator;
providing a surgical mesh comprising a first surface and a second surface, wherein the surgical mesh comprises a non-knitted/non-woven material;
providing a release sheet;
positioning the silicone applicator on the release sheet;
placing a liquid dispersion of silicone into the silicone applicator;
sliding the silicone applicator over the release sheet so that the liquid dispersion of silicone is dispersed onto the release sheet;
removing the silicone applicator from the release sheet;
placing the second surface of the surgical mesh onto the liquid dispersion of silicone;
applying pressure to the first surface of the surgical mesh so that the liquid dispersion of silicone is forced into the surgical mesh without penetrating all the way through the surgical mesh to the first surface of the surgical mesh;
curing the liquid dispersion of silicone so as to form the coated surgical mesh; and
removing the coated surgical mesh from the release sheet.
2 . A method according to claim 1 wherein the non-knitted/non-woven material comprises a polymer.
3 . A method according to claim 2 wherein the non-knitted/non-woven material comprises polypropylene.
4 . A method according to claim 1 wherein the viscosity of the liquid dispersion of silicone can be decreased by adding an organic solvent to the liquid dispersion of silicone whereby to control the percentage of tissue ingrowth on the first surface of the surgical mesh.
5 . A method according to claim 4 wherein the organic solvent is xylene.
6 . A method according to claim 4 wherein the liquid dispersion of silicone penetrates 10-20% of the depth of the surgical mesh so as to allow for 90-80% tissue ingrowth on the first surface of the surgical mesh.
7 . A method according to claim 4 wherein the liquid dispersion of silicone penetrates 20-40% of the depth of the surgical mesh so as to allow for 80-60% tissue ingrowth on the first surface of the surgical mesh.
8 . A method according to claim 4 wherein the liquid dispersion of silicone penetrates 40-60% of the depth of the surgical mesh so as to allow for 60-40% tissue ingrowth on the first surface of the surgical mesh.
9 . A method according to claim 1 wherein the liquid dispersion of silicone cures to a flexible solid.
10 . A method according to claim 1 wherein the step of curing comprises at least one from the group consisting of the application of heat, ultra-violet irradiation, drying, a catalyst, and gamma radiation.
11 . A method according to claim 1 wherein the step of curing comprises a combination of applying heat and a catalyst.
12 . A method according to claim 1 wherein the release sheet comprises polytetrafluoroethylene (PTFE).
13 . A method according to claim 1 further comprising trimming the coated surgical mesh after removing the coated surgical mesh from the release sheet.
14 . A method according to claim 1 wherein the step of applying pressure to the first surface of the surgical mesh comprises adding weights to the first surface of the surgical mesh.
15 . A method according to claim 1 wherein the silicone applicator comprises an opening with an adjustable height wherein the height of the opening controls the thickness of the liquid dispersion of silicone deposited on the release sheet.
16 . A method according to claim 15 wherein the height of the opening of the silicone applicator is 0.0405 inch.
17 . A method according to claim 1 further comprising placing a frame on the release sheet after the liquid dispersion of silicone has been dispersed on the release sheet so as to keep the release sheet flat.
18 . A method according to claim 1 further comprising using a flattening tool to ensure that the first surface of the surgical mesh is in full contact with the liquid dispersion of silicone before applying pressure to the first surface of the surgical mesh.