Self-sealing tissue expander and method

Details Self-sealing tissue expander and method Self-sealing tissue expander and method

A - Human Necessities

61

F

3/114

A61F 2/12 (2006.01) A61L 27/18 (2006.01) B32B 25/10 (2006.01)

Patent

CA 2022709

ABSTRACT OF THE DISCLOSURE The self-sealing tissue expander includes inner and outer layers of relatively nonflowable material and a median layer of flowable material. The median layer of flowable material which can include one or more sublayers of flowable material is under a predetermined compression imposed by the inner and outer layers due to a prestressing of the tissue expander shell during formation of the tissue expander. The self-sealing shell seals an opening in the shell wall following removal of an infusion needle. In all embodiments of the invention a needle stop member is provided to prevent the needle that accesses the fluid chamber from passing outwardly of the tissue expander. The need for a septum, a fluid conduit or a special fluid entry opening in the tissue expander shell is thus optional. The shell can also be made relatively more stretchable in some areas than in other areas.

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