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Automatic injector device

  • US 4,108,177 A
  • Filed: 04/13/1977
  • Issued: 08/22/1978
  • Est. Priority Date: 04/23/1976
  • Status: Expired due to Term
First Claim
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1. An automatic injector device comprising:

  • a frame;

    a removable injection syringe comprising a syringe body, a syringe piston and at least one injection needle;

    a syringe cradle carrying said syringe body and forming therewith a syringe-cradle assembly which is slidably mounted with respect to said frame by means of guiding means;

    drive means coupled to said syringe-cradle assembly for actuating said syringe-cradle assembly in reciprocating motion between a retracted rear position which is a non-operative position of said injector device and an operative front position corresponding to the injection position, and for actuating said syringe piston with respect to said syringe body;

    stop means located on said frame and delimiting said front position of said syringe-cradle assembly;

    said drive means including an electromagnet actuating a magnetic core connected to a movable member bearing upon said syringe piston, said drive means driving said syringe piston simultaneously with said syringe-cradle assembly in rectilinear displacement towards its front position and then only driving said syringe piston when said syringe-cradle assembly reaches its front position, said drive means further including resilient means for resiliently returning said syringe-cradle assembly to its retracted rear position; and

    control means for selectively energizing said electromagnet.

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