Devices having a textured surface
A method for forming a randomly textured surface on an implantable device such as soft tissue prosthesis. The textured surface has numerous cavities, interstices and passageways or tunnels and is thus referred to as a microporous surface texture. The surface is formed by two or more applications of polymeric particles and a polymeric dispersion.
1. A method for creating a textured surface on a workpiece, the method comprising:
a) providing a workpiece having a surface;
b) applying particles of a solid polymeric material to at least a portion of the surface to create a particle covered portion of the surface;
c) applying a polymer dispersion to at least the particle covered portion of the surface to create a coated surface;
d) applying particles of a solid polymeric material to at least a portion of the coated surface in a non-uniform fashion to create the textured surface of the workpiece including cavities and interstices; and
e) applying a polymer dispersion to at least the particle covered portion of the coated surface.
2. The method of claim 1 wherein steps d) and e) are repeated such that there are alternating multiple applications of particles of a solid polymeric material and multiple applications of polymer dispersion.
3. The method of claim 1 wherein the solid polymeric particles are silicone particles.
4. The method of claim 1 or 3 wherein the polymer dispersion is a silicone dispersion.
5. The method of claim 1 wherein the solid polymeric particles are silicone particles, the polymer dispersion is a silicone dispersion and wherein the silicone dispersion is at least partially cured after application but prior to any subsequent application of silicone particles.
6. The method of claim 5 wherein the workpiece is formed at least in part of silicone.
7. The method of claim 5 wherein the surface is uncured or partially cured silicone.
8. The method of claim 1 , 5 or 7 wherein the workpiece is the shell of an implantable prosthesis.
9. The method of claim 8 wherein the prosthesis is a mammary prosthesis.
10. The method of claim 1 wherein the average size of the particles used in the first application of particles differs from the average size of the particles used in the second application of particles.
11. The method of claim 2 wherein the average size of the particles used in at least one of the multiple applications of particles differs from the average size of the particles used in at least one other of the multiple applications of particles.
12. The method of claim 11 wherein the average size of the particles in each of the multiple applications of particles differs in average size from the average size of the particles used in each of the other multiple applications of particles.
13. The method of claim 2 wherein steps d) and e) each occur at least two times.
14. The method of claim 2 wherein steps d) and e) each occur at least three times.
15. The method of claim 2 wherein steps d) and e) each occur at least four times.
16. The method of claim 2 wherein steps d) and e) each occur at least five times.
17. The method of claim 2 wherein steps d) and e) each occur at least six times.
18. The method of claim 1 wherein the polymer dispersion is applied by spraying.
19. The method of claim 1 wherein the polymer dispersion is applied by dipping.
20. The method of claim 1 wherein the particles of polymeric material are applied by spraying the particles.
21. The method of claim 1 wherein the particles of polymeric material are applied by dipping the workpiece into particles.
22. The method of claim 20 or 21 wherein the particles are suspended in a silicone dispersion and then applied.
23. The method of claim 3 wherein the silicone particles are formed of HTV silicone.
24. The method of claim 4 wherein the silicone dispersion is an HTV silicone dispersion.
25. The method of claim 4 wherein the silicone dispersion contains between 6% and 15% solids.
26. The method of claim 4 wherein the silicone dispersion contains between 8% and 13% solids.
27. The method of claim 4 wherein the silicone dispersion contains between 9% and 11% solids.
28. The method of claim 4 wherein the solvent in the silicone dispersion is xylene.
29. The method of claim 1 , further comprising forming one or more of overhangs, tunnels or passageways in the surface.
30. The method of claim 1 , further comprising forming a plurality of cavities in the surface, one or more of the cavities having a top and a base wider than the top.
31. A method for producing an implant shell having a textured surface, the method comprising:
a) providing a implant shell formed of a polymeric material;
b) applying particles of a solid polymeric material to at least a portion of at least one surface of the shell to create a particle covered portion of the surface;
c) applying a polymer dispersion to at least the particle covered portion of the surface to create a coated surface;
d) applying particles of a solid polymeric material to at least a portion of the coated surface in a non-uniform fashion to create the textured surface of the workpiece including cavities and interstices; and
e) applying a polymer dispersion to at least the particle covered portion of the coated surface.
32. The method of claim 31 wherein steps d) and e) are repeated such that there are alternating multiple applications of particles of a solid polymeric material and multiple applications of polymer dispersion.
33. The method of claim 31 wherein the solid polymeric particles are silicone particles.
34. The method of claim 31 or 32 wherein the polymer dispersion is a silicone dispersion.
35. The method of claim 31 wherein the solid polymeric particles are silicone particles, the polymer dispersion is a silicone dispersion, and the silicone dispersion is at least partially cured before application of silicone particles.
36. The method of claim 31 wherein the implant is a mammary prosthesis.
37. The method of claim 32 wherein steps d) and e) each occur at least two times.
38. The method of claim 32 wherein steps d) and e) each occur at least three times.
39. The method of claim 31 , further comprising forming one or more of overhangs, tunnels or passageways in the surface.
40. The method of claim 31 , further comprising forming a plurality of cavities in the surface, one or more of the cavities having a top and a base wider than the top.
41. A method for producing a soft tissue prosthesis or tissue expander, the method comprising:
a) providing a shell formed of a polymeric material;
b) applying particles of a solid polymeric material to at least a portion of at least one surface of the shell to create a particle covered portion of the surface;
c) applying a polymer dispersion to at least the particle covered portion of the surface to create a coated surface;
d) applying particles of a solid polymeric material to at least a portion of the coated surface in a non-uniform fashion to create the textured surface of the workpiece including cavities and interstices;
e) applying a polymer dispersion to at least the particle covered portion of the coated surface;
f) sealing the shell and providing the shell with a filling port.
42. The method of claim 41 , further comprising one or more of overhangs, tunnels or passageways in the surface.
43. The method of claim 41 , further comprising forming a plurality of cavities in the surface, one or more of the cavities having a top and a base wider than the top.
44. The method of claim 41 , further comprising permanently filling the shell with a fluid or a gel.