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Device and method useful in monitoring fluid flow in a drug injector

  • US 4,411,651 A
  • Filed: 05/26/1981
  • Issued: 10/25/1983
  • Est. Priority Date: 05/26/1981
  • Status: Expired due to Term
First Claim
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1. In a peristaltic pump having a conduit and at least one valve means for restricting fluid flow through said conduit, a means for determining the position of said valve means comprising monitoring means for generating a signal related to the electrical resistance of fluid between two points located within said conduit and on opposite sides of said valve means, said electrical resistance being related to the cross-sectional area of a portion of said conduit whose cross-sectional area is altered by said valve means, said electrical resistance thus being related to the position of said valve means.

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