초록 ▼

Metering apparatus for metering the flow of fluid through an administration set includes a peristaltic-type metering pump which repeatedly and progressively compresses a section of vinyl tubing of the administration set to provide a desired flow rate. For improved metering accuracy the fluid is main

Metering apparatus for metering the flow of fluid through an administration set includes a peristaltic-type metering pump which repeatedly and progressively compresses a section of vinyl tubing of the administration set to provide a desired flow rate. For improved metering accuracy the fluid is maintained under pressure upline and downline of the metering pump to assist the tubing in becoming fully restored following each compression by the pump. In the illustrated embodiment, upline pressure is provided by a peristaltic-type pressure pump which is operated at a controlled rate to maintain a predetermined upline pressure, and downline pressure is provided by a spring-biased plunger which bears against the tubing downline of the metering pump to partially occlude the tubing.

대표청구항 ▼

In a flow system for infusing a fluid from a supply reservoir into the human body, having, in combination: a length of flexible-walled tubing extending from the supply reservoir to the body, said tubing exhibiting incomplete restoration upon repeated compressive cycling thereof; metering means conti

In a flow system for infusing a fluid from a supply reservoir into the human body, having, in combination: a length of flexible-walled tubing extending from the supply reservoir to the body, said tubing exhibiting incomplete restoration upon repeated compressive cycling thereof; metering means continuously including at least one pressure means compressively engaged to the sidewall of said tubing for completely occluding the lumen thereof; drive means for advancing the point of engagement of said pressure means along a segment of said tubing, the lumen of said tubing being repetitively and progressively compressed and restored along said segment to urge fluid through said tubing; downline pressurization means for continuously at least partially restricting the lumen of said tubing downline of said tubing segment to increase the pressure of the fluid within said segment downline of said point of engagement; the improvement comprising: upline pressurization means operatively engaging said tubing for increasing the pressure of said fluid in said segment upline of said point of engagement, the increase in pressure of said fluid at said point of engagement assisting in post-compressive reformation of said tubing for improved metering accuracy.