Patent GB-634918-A (GB)
Title: Improvements in or relating to endoscopic surgical instruments
IPC: A61B18/14
Filed: 1946-04-25
Abstract: 634,918. Endoscopic surgical instrument. AMERICAN CYSTOSCOPE MAKERS, Inc. April 25, 1946, No. 12479. Convention date, April 25, 1945. [Class 81(ii)] An endoscopic surgical instrument comprises a grip member, a sheath for insertion into a body cavity mounted on the grip member and means interconnecting the sheath and the grip member for permitting relative rotation therebetween, said instrument comprising a telescope in said sheath, said telescope being rotatable with the sheath relative to the grip member. As shown in Fig. 5, the grip member consists of a hollow handle 20 comprising a rear chamber 22 to the back wall 30 of which electrical leads for the high frequency resecting and cauterizing current and for the illuminating current are mounted on insulating blocks 38 and 42 respectively and a forward chamber 24 traversed by the instrument carrier 102 which is fitted into a forward bearing 78, situated in the front wall 28 of the said chamber and having at its rear end the carrier driving gear 80 and at its forward end the manually operated carrier rotating wheel 82 (Figs. 5 and 6), and into a rear bearing 104 mounted in a dividing wall 26. The instrument carrier 102 is reciprocated by a driven pinion 106 (Fig. 4) secured thereto engaging with the trigger fork tines 64 which are operated by the movement of the spring-controlled trigger 56 mounted in, and projecting from, the handle 20 beneath the instrument carrier. Intermediate gear 108 situated in the lower part of the chamber 24 and enmeshing with the carrier rotating pinion 80 and the driven pinion 106, is elongated so that as the driven pinion 106 moves with the reciprocating instrument carrier 102, the engagement of the three gears 80, 108, and 106 remains undisturbed and hence the instrument carrier may be rotated and reciprocated simultaneously. The instrument carrier terminates at its forward end in the tubes 122 and 124 one of which carries the telescope and the other the cutting loop shank. A removable sheath 132 of insulating material, designed for insertion into animal body cavities, is mounted on a sleeve nipple 92, immediately forward of the rotating wheel 82, and has a cut-away portion through which the illuminating and cutting loop is exposed. The telescope shank 172, which passes through the full length of the instrument, is removably mounted within the telescope tube 122 and comprises at its rear end an eye piece 180 and at its far end an objective lens 174 and light bulb 178 and is capable of being locked in the instrument carrier 102 so that the lens 174 is always aligned with the cut-away portion of the sheath 132. The cutting loop shank 152 is removably mounted within the cutting loop shank tube 124 and is insulated therefrom except for the exposed cutting loop 158. Water or other liquid may be introduced into the forward end of the instrument through the inlet tube 74 fitted to the front wall 28 of the grip member. To facilitate sterilization of the instrument carrier its body may be cut with a plurality of slots (not shown). In modifications (not shown) the reciprocating instrument carrier has in one case a square shaft and in the other a ribbed shaft, adapted to be engaged by the forward carrier bearing to which is secured the manually operated rotating wheel 82.