Patent ID: 7273359

Claim:
In an irrigating fluid positive displacement pump system having a housing with a panel parallel to a peristaltic pump roller assembly having a pump inlet and a pump outlet, inflow tubing to communicate fluid from a source to the pump, outflow tubing to communicate fluid from the pump to a work site, a pressure sensor to sense the pressure of fluid in the outflow tubing and a control system responsive to the pressure sensor to adjust the speed of the pump, the improvement comprising: a one-sided pressure sensing area situated on said housing, said area containing the pressure sensor; a tubing set comprising said inflow and outflow tubing and comprising a pressure transducer adapted to be sensed by said one-sided pressure sensing area, said tubing set comprising: a flexible inlet tube having a proximal end adapted to engage a fluid supply and a distal end; a flexible outlet tube having a proximal end and a distal end adapted to engage a surgical instrument at a surgical site; a flexible intermediate tube in operative engagement with the peristaltic pump, said intermediate tube having a proximal end and a distal end, said intermediate tube proximal end secured to said inlet tube distal end and said intermediate tube distal end secured to said outlet tube proximal end; a cassette means for fixedly holding the ends of said intermediate tube to thereby form a tube loop, said cassette means comprising: a base member comprising an inlet conduit interposed between said distal end of said inlet tube and said proximal end of said intermediate tube and an outlet conduit interposed between said distal end of said intermediate tube and said proximal end of said outlet tube; latch means to secure said pressure transducer adjacent to said pressure sensing area, said latch means comprising: a transverse pivot rib parallel and spaced a first predetermined distance from said front panel, said transverse rib situated between said peristaltic roller assembly and said cassette means; a transverse groove formed on said cassette means for engaging said transverse pivot rib; force means acting in a plane parallel to said panel and spaced therefrom a second predetermined distance, said first predetermined distance greater than said second predetermined distance, said force means for producing a force rotationally urging said cassette means about said transverse pivot rib; support means for preventing rotation of said cassette means about said transverse pivot rib to thereby maintain said tube loop in operative engagement with said peristaltic roller assembly.