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

F - Mech Eng,Light,Heat,Weapons

04

B

F04B 43/12 (2006.01) A61M 5/168 (2006.01) F04B 43/08 (2006.01) F04B 49/02 (2006.01) F04B 49/06 (2006.01)

Patent

CA 2113474

2113474 9304284 PCTABS00020 A volumetric pump (30) includes a motor (146) that rotatably drives a cam assembly (142), which 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.

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