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Method and apparatus for simultaneously injecting a liquid and a transponder into an animal

  • US 5,288,291 A
  • Filed: 08/12/1992
  • Issued: 02/22/1994
  • Est. Priority Date: 08/12/1992
  • Status: Expired due to Fees
First Claim
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1. An ejector for use with and adapted to be attached to a discharge end of a syringe for injecting a liquid into living tissue and simultaneously placing an object into the tissue, the ejector comprising a tubular hub adapted to be attached to a liquid discharge end of the syringe having proximal and distal ends;

  • an elongated, hollow needle secured to the hub, projecting from the distal end and having a sharp end adapted to make an incision in the tissue, the needle terminating short of the proximal end of the hub, the hub defining a chamber between the proximal end of the needle and the proximal end of the hub which has a larger cross-section than the needle;

    an elongated rod reciprocable disposed in the needle, having a diameter less than the inside diameter of the needle and a sufficient length so that it extends into the syringe when the hub is attached to the syringe; and

    retaining means disposed in the chamber and operably coupled with the rod for preventing the rod from axially moving under the influence of gravity out of either end of the needle, the retaining means comprising a sleeve frictionally engaging the rod and, upon the application of an axial force thereto, movable along the rod;

    whereby the object can be placed into the needle so that the object is forced by the rod through the incision into the tissue when a plunger of the syringe is moved towards the hub for injecting the liquid and thereby engages and moves the plunger relative to the needle towards the sharp end thereof.

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