GB1429436A - Surgical snare - Google Patents

Abstract

1429436 Surgical shares; cauterising AMERICAN CYSTOSCOPE MAKERS INC 12 Feb 1974 [28 Feb 1973] 06393/74 Heading A5R In a surgical share comprising a flexible loop 21 connected to a lead 20 which is manipulatable within a sheath 19, for retraction and projection of the loop relative to the sheath, the loop 21 comprises a flexible spirally wound sleeve 22 and a resilient core (23) Figs. 3 and 6 (not shown) having greater flexibility in the plane of the loop, when open, than a direction normal thereto. The core (23) comprises a band of rectangular cross-section of electrically conductive material e.g. stainless steel, which is disposed within the sleeve 10 that its thinner dimension lies in the plane of the loop. The sleeve may comprise two members (22a, 22b) Fig. 2 (not shown) of insulating material disposed on the loop so that the distal end (23a) of the loop is exposed, the proximal ends of the members and the core being secured to the lead 20 which is conductive. The lead 20 extends through the sheath, which is non- conductive material, e.g. polytetrafluoroethylene, and a stem 18 which is secured by a block 17 to a first handle part 14, 15. The proximal end of the lead 20 is secured by a clamping knob 26 to a second handle part 16, the handle parts being arranged for relative movement to move the lead 20 within the sheath 19. A cauterising or coagulation current may be applied to the loop and lead through a connector 27 on the second handle part 16.