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Device for the controlled infusion of medications

  • US 4,568,335 A
  • Filed: 09/07/1982
  • Issued: 02/04/1986
  • Est. Priority Date: 08/28/1981
  • Status: Expired due to Fees
First Claim
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1. A device for the infusion of measured amounts of a fluid comprising:

  • (a) a container having an outlet opening at a first end and an opening at a second end;

    (b) fluid displacement means operating in the container for the displacement of measured amounts of fluid from the container through the outlet opening at the first end, including an elongate rod extending into the container through the opening at the second end and having a piston head in sealing engagement with the container for displacement of fluid from the container through said outlet opening in response to displacement of the piston head and rod relative to the container in the direction towards the first end of the container;

    (c) means for endwise displacement of the piston and rod comprising a threaded portion on the length of the rod and an operating member fixed on the container in threaded engagement with the threaded portion of the rod; and

    (d) means for controllably advancing the elongate rod within the container comprising an elongate sleeve concentrically mounted over said rod for conjoint rotation with said rod having ramp means at the upper end thereof, a resilient member rotatable about the longitudinal axis of said elongate sleeve in operative communication with said ramp means and actuating means connected to said elongate sleeve with said resilient member being immovably held therebetween;

    whereby rotation of said actuating means rotates the elongate sleeve and the rod to displace the fluid through the outlet opening at said first end of the container.

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