SURGICAL INSTRUMENT

摘要

A surgical system comprises a tubular member (8), a surgical instrument (1) and a sealing assembly (23). The surgical instrument (1) is locatable within the tubular member (8), the tubular member having a distal end locatable at a surgical operation site which is supplied with pressurised gas, and a proximal end remote from the surgical operation site. The surgical instrument (1) has a distal end locatable at the surgical operation site. The sealing assembly (23) is provided at the proximal end of the tubular member (8) to seal the tubular member with respect to the proximal end portion of the surgical instrument (1) to prevent gas escaping from the surgical operation site through the proximal end of the tubular member. The sealing assembly (23) is constituted by a diaphragm (26) whose peripheral edge portions (26a) are fixed to the tubular member (8). The central portion (26b) of the diaphragm (26) is formed with a slit (27) through which the surgical instrument (1) passes. The sealing assembly (23) is such that movement of the surgical instrument (1) relative to the tubular member (8) causes the diaphragm (26) to move between first and second operating positions in which the slit (27) faces respectively towards and away from the distal end of the tubular member, and such that the edges of the slit sealingly engage with the surgical instrument in the first and second operating positions, and in all positions therebetween.