A lithotrite which forms part of an instrument used by urologists for crushing concretions in the urinary tract is provided by the invention as a modified form of the cutting loop of a resectoscope, which is an instrument normally used in transurethral resection procedures....http://www.google.se/patents/US4190051?utm_source=gb-gplus-sharePatent US4190051 - Lithotrite for electrohydraulic cystolithotripsy
