Detecting occlusion of proximal or distal lines of an IV pump

Details Detecting occlusion of proximal or distal lines of an IV pump Detecting occlusion of proximal or distal lines of an IV pump

1991-08-12

1992-05-26

Hepperle, Stephen M.

Pumps

Processes

417 63, 417282, 417474, 604153, F04B 4312, F04B 4902

Patent

active

051162032

ABSTRACT:
A method and apparatus for detecting proximal and distal occlusions of flexible tubing in a positive displacement pump. A volumetric pump (30) includes a motor (146) that rotatably drives a cam assembly (142). The rotating cam assembly actuates a plunger (48), causing it to compress a pumping portion (34b) of a flexible tubing (34), compression of the tubing displaces fluid trapped within the pumping portion, causing it to flow past an outlet cracking valve (52). A proximal pressure sensor (44) and a distal pressure sensor (56) each produce signals indicative of the pressure within the proximal portion and distal portion of the flexible tubing, which are used to determine whether a proximal or distal occlusion of the flexible tubing has occurred. Both pressure sensors comprise strain gauges connected to flexures that apply a spring-biased force against the proximal and distal portions of the flexible tubing. These sensors thereby respond to the cross-sectional size (diameter) of the tubing, as affected by fluid pressure therein. Proximal and distal pressures are thus monitored without violating the integrity of the flexible tubing passing through the volumetric pump.

REFERENCES:
patent: 4453931 (1984-06-01), Pastrone
patent: 4836752 (1989-06-01), Burkett

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