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Dental syringe having an automatically retractable needle

  • US 4,767,413 A
  • Filed: 04/20/1987
  • Issued: 08/30/1988
  • Est. Priority Date: 04/20/1987
  • Status: Expired due to Fees
First Claim
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1. A syringe including a hollow cylinder having an open proximal end and a substantially closed distal end, a pre-filled ampule loaded into said cylinder through the proximal end thereof, said ampule having a sealed cap at one end thereof, and a double ended hypodermic needle loaded into said cylinder ahead of said ampule and arranged in spaced axial alignment with said ampule, said syringe also including:

  • means for advancing said ampule axially and distally through said cylinder so that a proximal end of said needle penetrates the end cap of said ampule and a distal end of said needle projects outwardly from said cylinder past the distal end thereof; and

    locking means for releasably retaining said ampule at the distally advanced position within said cylinder, said locking means including at least one locking arm being pivotally connected to said syringe cylinder so as to be rotatable inwardly through an opening in said cylinder and towards said ampule to retain said ampule at said distally advanced position, said locking arm also being rotatable outwardly and away from said ampule for releasing said ampule from the distally advanced position.

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