| 摘要 |
PROBLEM TO BE SOLVED: To provide a valve having a pre-deployed support structure, for example a support structure adapted to be mounted to an esophageal luminal prosthesis such as a stent.SOLUTION: An esophageal valve 1 comprises a polymeric valve body having an outer support region 2, at least three valve leaflets 3, 4, 5, and a main body region 6 extending between the support region 2 and the valve leaflets 3, 4, 5. The valve 1 has a normally closed configuration in which the valve 1 is closed, an antegrade open configuration in which the valve leaflets 3, 4, 5 are opened in response to an antegrade force to allow flow through the valve 1, and a retrograde open configuration in response to a retrograde force which is substantially larger than the antegrade force. |
