Method for manufacturing a breast prosthesis
A method for manufacturing a breast prosthesis, in which a film bag is welded together from at least three film layers for producing at least two chambers.
1. A method for manufacturing a breast prosthesis having bodies modeling the shape of the breast, which are shrink-wrapped in plastic films, comprising the following steps:
welding of a film bag from at least three film layers for producing at least first and second chambers,
inserting and fixing the film bag in a prosthesis molding tool,
filling the first chamber with a first compound capable of crosslinking at ambient temperature or at slightly elevated temperature,
pre-crosslinking the compound, while inflating the at least second chamber with a fluid,
draining the fluid from the second chamber, and subsequently filling the second chamber with a second compound,
closing the prosthesis molding tool, and completely crosslinking the compounds present in the chambers at elevated temperature.
2. The method according to claim 1 , wherein the film bag is fabricated from four film layers by forming three chambers, wherein a comparatively thin third chamber is arranged on a back of the breast prosthesis.
3. The method according to claim 2 , wherein the third chamber and the first chamber are filled with a material which initially is only pre-crosslinked.
4. The method according to claim 3 , wherein the first and optionally the third chamber form a thin outer layer with a layer thickness of 2 mm-10 mm, which surround the second chamber on one side.
5. The method according to claim 4 wherein the thin outer layer surrounds the second chamber on two sides.
6. The method according to claim 2 , wherein the film layers forming the film bag are welded together by forming a welding seam of uniform width, wherein by choosing the width of the welding seam and choosing an inflation pressure, uniformity of the layer thickness is adjustable.
7. The method according to claim 6 , wherein the welding seam width of the films forming the first chamber is chosen so that at a given inflation pressure a uniform layer thickness is formed, while the welding seam of the films forming the third chamber is chosen comparatively narrower, in order to obtain a layer thickness non-uniform across the chamber at the same inflation pressure such that the layer thins out towards the welding seam, while it is thicker towards the center.
8. The method according to claim 1 , wherein the film layers forming the film bag are made of polyurethane.
9. The method according to claim 8 , wherein the polyurethane film layers have a thickness of 40 μm-100 μm.
10. The method according to claim 1 , wherein the film layers are welded together by thermal welding, HF welding or laser welding.
11. The method according to claim 1 , wherein the bodies shrink-wrapped in the plastic films are made of an addition crosslinking silicone, a thermoplastic polyurethane and/or a thermoplastic elastomer.
12. The method according to claim 1 , wherein the first compound filled into the first chamber of the film bag consists of a silicone mixture which crosslinks sufficiently at room temperature, in order to be pre-crosslinked and dimensionally stable after few minutes of reaction time.
13. The method according to claim 1 , wherein for complete crosslinking of the second compound filled into the second chamber of the film bag, a temperature is chosen such that the film permanently is plastically deformed without permanently damaging the film.
14. The method according to claim 1 wherein the films are a transparent, addition crosslinking two-component silicone rubber compound.
15. The method according to claim 1 wherein the fluid is air.