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Apparatus for supplying liquid to a body cavity during an endoscopic procedure includes a feedback loop-controlled liquid supply device inherently capable of supplying liquid at a substantially constant pressure substantially independent of the flow rate of liquid delivered by the liquid supply devi

Apparatus for supplying liquid to a body cavity during an endoscopic procedure includes a feedback loop-controlled liquid supply device inherently capable of supplying liquid at a substantially constant pressure substantially independent of the flow rate of liquid delivered by the liquid supply device within a relatively wide range of flow rate. Also disclosed are a disposable plastic pump cassette having an inflow pump in a housing, and an operative cannula. The surgical procedure is performed with continuous control over the body cavity pressure, regardless of the outflow flow rate.

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Apparatus for supplying liquid to a body cavity during an endoscopic procedure, which comprises: inflow pump means inherently capable of supplying liquid at a substantially constant pressure substantially independent of the flow rate of liquid supplied by the inflow pump means; pressure sensing mean

Apparatus for supplying liquid to a body cavity during an endoscopic procedure, which comprises: inflow pump means inherently capable of supplying liquid at a substantially constant pressure substantially independent of the flow rate of liquid supplied by the inflow pump means; pressure sensing means for generating a body cavity pressure signal representing the pressure in said body cavity; conduit means for communicating said inflow pump means with said body cavity to deliver liquid under pressure to said body cavity; control means responsive to said body cavity pressure signal for increasing or decreasing the pressure of said liquid delivered by said inflow pump means to thereby maintain said body cavity pressure at a predetermined level; a liquid outflow cannula for insertion into said body cavity for transporting liquid from said body cavity; an outflow suction pump means connected to said liquid outflow cannula; and a disposable plastic pump cassette comprising a housing, said inflow pump means and said outflow suction pump means being in said housing and conduit means within said housing for supplying liquid to and delivering liquid under pressure from said inflow pump means and for supplying liquid to and delivering liquid from said outflow suction pump means.