The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 09, 1994
Filed:
Feb. 01, 1993
Jules Silver, Boca Raton, FL (US);
Louis C Ziegler, Englewood Cliffs, NJ (US);
Innova Development Corp., Boca Raton, FL (US);
Abstract
An improved hypodermic syringe includes a needle retraction feature permitting the needle to be fully retracted into the cylindrical cavity of the syringe barrel following the injection of medicine into a patient. The needle is held on the distal end of the barrel by means of an attachment hub, which includes an internal abutment surface to prevent outward movement of the needle. Inward movement of the needle is prevented by an expandable restriction of a distal barrel opening, extending between the cylindrical cavity and the distal end of the barrel. The needle is part of a subassembly including a flange held between this internal abutment surface and this expandable restriction. The distal end of the plunger is fitted with a needle extractor, which moves into the distal barrel opening as the plunger is pushed fully into the cylindrical cavity. The needle extractor grips the proximal end of the needle subassembly and expands the expandable restriction so that the needle subassembly, with its flange, is pulled into the cylindrical cavity as the plunger is pulled outward. The needle extractor may be elastically mounted on the plunger, pointing at an acute angle with the axis of the cylindrical cavity, so that the needle is rotated to point toward the side of the barrel as it is pulled fully within the cavity.