A medical extractor comprising a cannula assembly having an annularly expanding and retracting gripping and releasing mechanism on the distal end thereof and a moving assembly on the proximal end thereof. The arrangement is such that a manual movement of the moving assembly in one direction effects a...http://www.google.es/patents/US5906622?utm_source=gb-gplus-sharePatente US5906622 - Positively expanded and retracted medical extractor
Positively expanded and retracted medical extractor
