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:
Dec. 17, 2002
Filed:
Oct. 15, 2001
Thomas J. Shaw, Little Elm, TX (US);
Judy Zhu, Plano, TX (US);
Retractable Technologies, Inc., Little Elm, TX (US);
Abstract
A retracting syringe of one use has a plunger comprising a handle portion and a needle retention portion forward of the handle portion. A positive locking structure in the syringe barrel ensures the syringe is not reused. In one embodiment, the positive locking structure is a stop in the syringe barrel. The handle portion separates after one use and is removed from the syringe. In a second embodiment, the handle portion has a plurality of stepped serrations and the positive locking structure is a clip which is movable with respect to both the handle portion and the barrel. In a third embodiment, the positive locking structure is a clip fixed in an enlarged back opening of the barrel with springing points which are protected from a plurality of stepped serrations on the handle portion by a sliding collar. This one use feature can be applied to a nonretracting syringe.