Dilator facilitating stitching of opening in e.g. casing, balloon, surface or artery, expands to cause transverse approach of opening edges

摘要

A central section (5) for thread clamping and release, provides for dilation in one direction (X-X). This tenses the stitching region of the object, causing mutual approach of edges, transverse to the dilation. Preferred features: The central thread clamping section (5) is dilated mechanically and/or electrically and/or pneumatically. Dilation is caused by extension of an edge section of the central clamp. The clamp comprises a central section (5M) and two edges (5R1, 5R2) which can be moved relative to it. Actuators (DZ1, DZ2) push or pull edge sections relative to the center. There are two clamp sections in the central clamp. They are accommodated in a tube when inactive and are spring-loaded outwardly. The tube is retracted in the active state, and they are pressed apart. The clamping sections are drawn together by an actuator. Edge sections are moved relatively, by a cam-track control device. Pneumatic or hydraulic chambers are employed as actuators. To rest on the object, e.g. an artery, the outer region of the central thread clamp has a concave configuration.