Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1995-06-02
1997-08-12
Hofsass, Jeffery
Communications: electrical
Condition responsive indicating system
Specific condition
128DIG12, 128DIG13, 417 63, 4174777, 604 67, G08B 2100
Patent
active
056570007
ABSTRACT:
An method and apparatus for determining a degree of occlusion in the tubing loop disposed in the raceway of a peristaltic pump. An electrical circuit is formed in tubing loop by filling the loop with an electrically conductive fluid, such as blood, and electrically connecting the inlet portion to the outlet portion of the tubing loop. An excitation coil, which encircles a portion of the tubing loop, induces an alternating current in the tubing fluid. A sensing coil, also encircling a portion of the tubing loop, senses the induced current. The degree if occlusion in the tubing loop is correlated to the magnitude of the sensed current. The degree of occlusion may be adjusted, in response to the determined occlusion, while the pump is in operation using an occlusion adjuster.
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Cobe Laboratories, Inc.
Hofsass Jeffery
O'Connor Edna M.
Winsor Bruce R.
Wu Daniel J.
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