Load shaping for dynamic tensioning mechanisms and methods

摘要

A surgical tensioning device for dynamically holding two tissue portions in contact with one another comprises a resilient body having a plurality of spring elements, and a plurality of stop members for limiting travel of the spring elements in order to control energy stored or delivered by the spring elements. A length of suture is also provided, wherein a first end of the suture is connected to the resilient body at a first attachment point and a second end of the suture is connected to the resilient body at a second attachment point. In one embodiment, the stop members contact one another to limit compression of the spring elements. When the suture is placed in tension, the spring elements move to an extended configuration and the stop members move apart, creating gaps between ends of each of the stop members. When the gaps become sufficiently large, edges of the stop elements contact corresponding spring elements to impede further widening of the gaps and consequent further extension of the spring elements, thus protecting the springs.