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:
Apr. 11, 1989
Filed:
Dec. 21, 1987
Terry M Haber, Lake Forest, CA (US);
Clark B Foster, El Toro, CA (US);
John A Lewis, Jr, Costa Mesa, CA (US);
Habley Medical Technology Corporation, Laguna Hills, CA (US);
Abstract
A dental syringe of the type having a pre-filled cartridge of fluid medication and a double ended hypodermic needle communicating with the cartridge for injecting the contents thereof into a targeted tissue area of a patient. The cartridge is carried within an inner syringe cylinder, and the inner cylinder is slideable through an outer syringe cylinder. The inner cylinder has a pair of axially spaced locking grooves which extend around the periphery thereof. The outer cylinder includes a finger ring having an integral, inwardly projecting tab. The finger ring is hingedly connected to the outer cylinder so that the integral tab may be rotated into or out of engagement with either one of the pair of locking grooves of the inner cylinder. With the tab engaging a first of the locking grooves, the inner cylinder is retained at a relatively proximal position within the outer cylinder so that the needle is located inwardly of and completely shielded thereby to prevent an accidental needle strike. With the tab engaging a second of the locking grooves, the inner cylinder is retained at a relatively distal position within the outer cylinder so that the needle is extended outwardly thereof for administering an injection. A coil spring surrounds the inner cylinder for automatically biasing the inner cylinder and hypodermic needle towards the shielded proximal position within the outer cylinder.