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:
May. 21, 1991
Filed:
May. 04, 1990
Robert J Sullivan, Rancho Santa Margarita, CA (US);
Other;
Abstract
A self retracting hypodermic syringe resembles and is used like a standard syringe except that it is automatically disabled at the instant that the injection is completed. During the injection, the plunger is pressed into the syringe body. When the plunger reaches the front of the syringe an actuating element attaches to the needle assembly and unlocks it from the syringe body. At the same time a spring is unlatched driving the injection needle into the body of the syringe. In order to actuate the spring the plunger must be driven beyond a detent provided for tactile identification of the limit of travel for the purpose of filling the syringe. After use, the needle cannot be retrieved and the syringe is not reusable. The fast withdrawal of the needle from the patient results in much less pain.