Apparatus for use with fluid flow transfer device
First Claim
1. A fluid flow chamber cassette assembly for mounting on a machine including a peristaltic pump roller moving about a pump axis and means for supporting a fluid flow transfer device, said cassette assembly comprisinga rigid plastic casing having front and rear walls spaced from each other and a side wall between said front and rear walls at one side to partially define a first fluid flow chamber, said casing also having a first chamber inlet to said chamber, and a first chamber outlet from said first chamber formed in said side wall,a first flexible tube for directing liquid from said first chamber to said transfer device, said first tube forming a portion of a loop adapted to be acted upon by said roller of said peristaltic pump, one end of said first tube being connected to said first chamber outlet and another portion of said loop being secured to said casing so that said loop is symmetrical about a loop axis transverse to said sidewall, said loop axis passing through said pump axis when mounted on said machine, andmounting means for mounting said casing on said machine in two positions, the first position being said rear wall against said machine, the second position being said front wall against said machine, portions of said loop being on opposite sides of said loop axis when changed from said first to said second position.
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Accused Products
Abstract
A fluid flow chamber cassette that can be mounted with either its front wall or rear wall against a supporting machine and has a flexible tube that extends from a sidewall and forms a loop that is symmetrical about a loop axis that is transverse to the side wall so that the loop will be acted upon by a pump roller on the machine both when the front wall is against the machine and when the rear wall is against the machine. Also disclosed is automatically fixing the initial liquid levels and amounts of air in venous and arterial chambers of fluid flow transfer device apparatus by having the arterial chamber inlet enter the arterial chamber at a position higher than the arterial chamber outlet, having the venous chamber inlet enter the venous chamber at a position higher than the venous chamber outlet, and priming the apparatus by causing reverse flow, so that the liquid rises in the venous and arterial chambers to the level of the entrances of the inlets. Also disclosed is sensing pressure of fluid in a fluid flow chamber by placing an impermeable flexible diaphragm over a hole in a rigid wall of the fluid flow chamber, providing a second chamber on the other side of the diaphragm, and sensing the pressure in the second chamber.
276 Citations
15 Claims
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1. A fluid flow chamber cassette assembly for mounting on a machine including a peristaltic pump roller moving about a pump axis and means for supporting a fluid flow transfer device, said cassette assembly comprising
a rigid plastic casing having front and rear walls spaced from each other and a side wall between said front and rear walls at one side to partially define a first fluid flow chamber, said casing also having a first chamber inlet to said chamber, and a first chamber outlet from said first chamber formed in said side wall, a first flexible tube for directing liquid from said first chamber to said transfer device, said first tube forming a portion of a loop adapted to be acted upon by said roller of said peristaltic pump, one end of said first tube being connected to said first chamber outlet and another portion of said loop being secured to said casing so that said loop is symmetrical about a loop axis transverse to said sidewall, said loop axis passing through said pump axis when mounted on said machine, and mounting means for mounting said casing on said machine in two positions, the first position being said rear wall against said machine, the second position being said front wall against said machine, portions of said loop being on opposite sides of said loop axis when changed from said first to said second position.
Specification