| 摘要 |
A tissue expander comprising a self-inflating core having a non-inflated state and an inflated state and a coating 14 surrounding said core, in which said core comprises a compacted material having a central portion 16 of a first, higher density D and a peripheral portion 18 of a second, lower density d, a border 19 between said central portion 16 and said peripheral portion 18 and wherein said coating 14 includes a plurality of first and / or second apertures 20, 22 through said coating 14. Also a method of manufacturing said tissue expander. The arrangement is such as to allow for the controlled ingress of water into the expandable core which allows for the control of the delay before expansion and the rate of expansion once initiated. |
