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Pressure-indicating syringe

  • US 4,064,879 A
  • Filed: 04/06/1976
  • Issued: 12/27/1977
  • Est. Priority Date: 04/06/1976
  • Status: Expired due to Term
First Claim
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1. A syringe comprising:

  • a barrel having an apertured wall at one end and open at its opposite end;

    a plunger assembly movably received within the open end of the barrel;

    said plunger assembly including a shaft at its outer end, and a piston at its inner end defining a compartment with the barrel apertured wall for receiving a fluid to be injected through the aperture thereof;

    finger-gripping elements on the barrel and on the plunger shaft enabling the latter and the piston to be manually moved towards the apertured wall of the barrel for pressure-injecting fluid therethrough;

    an elastic connection between the finger-gripping element of the plunger shaft and the piston enabling the piston to be displaced relative to the shaft finger-gripping element an amount corresponding to the pressure on the piston during the injection of the fluid, and indicium carried by said piston and viewable through said barrel thereby providing a viewable indication of the injection pressure.

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