Claims
- 1. A skin expanding device comprising:
- a substantially non-extensible base;
- an expansion layer joined to the periphery of the base defining an expansion chamber when fluid is introduced between the base and the expansion layer;
- means for introducing fluid between the base and the expansion layer; and
- wherein the expansion layer includes only first and second area portions, the first area portion being 50% to 300% thicker than the second area portion such that when fluid is introduced between the expansion layer and the non-extensible base, the first area portion expands proportionally differentially from the second area portion, both area portions expanding as fluid is being introduced, the expansion layer and base initially being flat in a non-expanded state so that the expansion layer is in contact with the base throughout the layers' entire area so that neither base nor layer has any folds or wrinkles when in the non-expanded state.
- 2. The device of claim 1 wherein the first portion expands at a proportional rate with respect to the second portion.
- 3. The device of claim 1 wherein the means for introducing fluid is a fill tube fluidly communicating with the chamber.
- 4. The device of claim 1 wherein the means for introducing fluid is an injection site in fluid communication with the chamber.
Parent Case Info
This is a continuation of application Ser. No. 06/909,223, filed Sept. 19, 1986 (now abandoned).
US Referenced Citations (18)
Continuations (1)
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Number |
Date |
Country |
Parent |
909223 |
Sep 1986 |
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