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The United States Surgical Corporation patent solves the following problem:
This invention relates to a seal system adapted to allow the introduction of surgical instrumentation into the body of a patient. In particular, the invention is applicable to a cannula assembly where a cannula housing included or adapted to receive a seal assembly to sealingly accommodate instruments of different diameters inserted through the seal assembly and the cannula.
Our analysis of this patent is as follows:
United States Surgical Corporation’s patent US 5492304 A deals with Seal assembly for accommodating introduction of surgical instruments.
A seal assembly which includes a housing and a resilient first seal means associated with the housing. The first seal means is preferably a gasket having an aperture formed therein for receiving surgical instrumentation adapted to cooperate with a dilating means having an outer surface that had -with housing for dilating the aperture in the gasket. The first seal means and the dilating means adapted for relative movement therebetween, the first seal means and the dilating means assuming a first position wherein the aperture of the first seal means spaced from the dilating means and adapted to receive surgical instrumentation of a first diameter with minimal insertion force, and think that a second position in which the aperture of the first seal means that stretched around the outer surface of the dilating means for receiving surgical instrumentation of a second diameter greater than the first diameter with minimal insertion forces.
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