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Self contained mechanical injector

  • US 4,269,185 A
  • Filed: 03/29/1979
  • Issued: 05/26/1981
  • Est. Priority Date: 01/08/1979
  • Status: Expired due to Term
First Claim
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1. Apparatus for selectively dispensing a fluid at a controlled slow rate into a patient comprising:

  • container means defining a fluid chamber therein for containing the fluid to be dispensed and defining a fluid outlet therefrom through which the fluid is to be dispensed into the patient;

    expelling means operatively associated with the fluid in said container means to expel the liquid from said container means, said expelling means including a piston member slidably mounted in said fluid chamber for positively forcing the fluid from said fluid chamber as said piston member moves toward the outlet end of said fluid chamber, said piston member moved toward the outlet end when said expelling means is driven;

    spring operated driving means for selectively driving said expelling means to force said piston member toward the outlet end of said fluid chamber; and

    control means operatively connected to said driving means for selectively and successively causing said driving means to move said piston member to successively and incrementally force the fluid from said fluid chamber in said container means into the patient at a selected prescribed average rate over a prolonged period of time, said control means alternatively releasing said driving means for a first prescribed short period of time fo fixed duration so that said driving means causes said expelling means to force fluid from said fluid chamber in said container means at a first prescribed rate greater than the selected prescribed average rate and said control means alternatively arresting the operation of said driving means for a second prescribed short period of time to stop the fluid flow from said fluid chamber so that the fluid is forced from said fluid chamber in said container at the selected prescribed average rate over the sum of said first and second periods of time, said control means including adjustment means for selectively varying the duration of only said second prescribed short period of time without varying the duration of said first prescribed period of time to selectively vary the selected prescribed average rate at which the fluid is forced from said fluid chamber of said container into the patient.

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