| 摘要 |
PCT No. PCT/SE90/00878 Sec. 371 Date Jun. 26, 1992 Sec. 102(e) Date Jun. 26, 1992 PCT Filed Dec. 27, 1990 PCT Pub. No. WO91/09576 PCT Pub. Date Jul. 11, 1991.A voice prosthesis is adapted to be inserted into a fistula between an esophagus and a trachea of a user. This prosthesis includes a cylindrical middle piece defining a passageway therethrough which has a groove therein and which has first and second end portions. First and second external flanges extend from respective first and second end portions of the middle piece. The middle piece and the flanges are all made of flexible material. A ring made of a material which is stiff in relation to the flexible material of the middle piece and the flanges is inserted into the groove in the passageway of the middle piece for stiffening of the middle piece. A valve is provided which includes a seat formed in the passageway of the middle piece and a flap extending across the passageway and carried by the middle piece for resting on the seat to close the passageway and is adapted to be moved off the seat to open the passageway. |
