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Pulsed external medication dispenser

  • US 4,596,558 A
  • Filed: 09/13/1985
  • Issued: 06/24/1986
  • Est. Priority Date: 09/13/1985
  • Status: Expired due to Fees
First Claim
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1. A pulsed liquid injection device comprising a first liquid storage container adapted to store liquid under pressure greater than that required for making injections, a second liquid metering container also adapted to store liquid under a pressure greater than that required for making injections and having a predetermined capacity for liquid at the pressure in the first container, valve means having first, second and third ports and having a first operating condition in which the valve means connect together the first and second ports but blank off the third port, and a second operating condition in which the valve means blank off the first port but connect together the second and third ports, first liquid flow passages connecting the first port to the interior of the first storage container, second fluid flow passages connecting the second port to the interior of the second metering container, a liquid dispensing duct connected to said third port and electrical timing means arranged repeatedly at predetermined intervals to apply an electrical operating pulse to the said valve means to change them from one initial operating condition to the other and, after a delay determined by the pulse length, to permit the valve means to return to their initial position.

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