Dental syringe having an automatically retractable needle
Patent 4767413 Issued on August 30, 1988. Estimated Expiration Date: 
April 20, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
April 20, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3055362 3066670 3136313 3306290 3605744 InventorsAssigneeApplicationNo. 07/039715 filed on 04/20/1987US Classes:604/198, Cover or protector for body entering conduit movable axially relative to one another604/232Material reservoir (e.g., cartridge, etc.) removably mounted in syringeExaminersPrimary: Yasko, John D.Attorney, Agent or FirmInternational ClassesA61M 5/32 (20060101)A61M 5/24 (20060101) AbstractA disposable dental syringe of the type having a pre-filled ampule of fluid medication and a double ended hypodermic needle arranged in spaced, axial alignment with the ampule. The ampule may be moved axially through the cylinder of the syringe until the proximal end of the needle penetrates the ampule and the distal end of the needle extends outwardly from the cylinder for administering an injection. The ampule is locked in the distal position so that an injection may be administered. Upon completing the injection, the ampule is released from the distal position and moved proximally through the cylinder, so that the distal end of the needle is automatically retracted within the cylinder. The syringe may now be safely discarded with the hypodermic needle completely shielded within the cylinder, so as to eliminate the necessity of handling and/or breaking the needle and, thereby, avoiding the possibility of an accidental needle strike.Field of SearchCover or protector for body entering conduit movable axially relative to one anotherCommon cover or protector for body entering conduit and material syringe reservoir Material reservoir (e.g., cartridge, etc.) removably mounted in syringe Piston actuator mounted in means (e.g., yoke, etc.) pivoted to syringe Material reservoir centered or clamped in syringe by slidable component Means for ejecting, or facilitating ejection of material reservoir from syringe Material supply means pierced by conduit | |
