| 摘要 |
The invention relates to a constrictor for closing or constricting a passage through tissue of a hollow organ. The constrictor comprises: a ring consisting of a thread-like body, which, viewed in the peripheral direction of the ring, extends in a wavy pattern; as well as pins for fastening to tissue surrounding the passage to be closed or restricted; which pins are arranged distributed over the periphery of the ring. Each pin has a fixed end, which is rigidly attached to the ring, and a free end, which is of pointed design. The constrictor is deformable from a first state into a second state, whilst, in the meantime, a pretension is built up such that the constrictor, in the second state, is under a pretension acting in the direction of the first state. In this second state, the pretension comprises a torsional stress which is present in portions of the thread-like body at the fixed end of each pin. This torsional stress is inclined to want to pivot the respective pin back in the direction of the first state. Furthermore, the threadlike body, in portions thereof at the fixed end of a pin, can be twisted. |
