Apparatus for use with fluid flow transfer device

Details Apparatus for use with fluid flow transfer device Apparatus for use with fluid flow transfer device

1987-02-11

1989-01-17

Jones, W. Gary

Measuring and testing

Fluid pressure gauge

Diaphragm

210 90, 210251, 21032172, G01L 708, B01D 3500

Patent

active

047980907

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 symetrical 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.

REFERENCES:
patent: 4024483 (1977-05-01), Tomczak et al.
patent: 4077882 (1978-03-01), Gangemi
patent: 4109535 (1978-08-01), Reed et al.
patent: 4168517 (1979-09-01), Lee
patent: 4226124 (1980-10-01), Kersten
patent: 4227420 (1980-10-01), Lamadrid
patent: 4263808 (1981-04-01), Bellotti et al.
patent: 4412916 (1983-11-01), Kell
patent: 4432238 (1984-02-01), Tward

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