Retractable needle hypodermic syringe system
Patent 4994034 Issued on February 19, 1991. Estimated Expiration Date: 
July 11, 2009. 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.
July 11, 2009. 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 3046985 3306290 Cannula insertion set with safety retracting needle Patent #: 4747831 InventorsApplicationNo. 378275 filed on 07/11/1989US Classes:604/110, Having means for preventing reuse of device604/198Cover or protector for body entering conduit movable axially relative to one anotherExaminersPrimary: Pellegrino, Stephen C.Assistant: Maglione, Corrine Attorney, Agent or FirmForeign Patent References
International ClassA61M 005/24AbstractA hypodermic injection system with a retractable needle wherein the needle retracts within the interior cavity of a syringe plunger, so that the needle is safely and confinedly held within the plunger for ease of handling and transport, while remaining safely therein. A cylindrical spring housing has resilient fingers which can capture a coiled spring which biasly holds a needle holder against the retaining force of the resilient fingers. The plunger has a frangible end, which, when engaging the resilient fingers under a pre-determined amount of force, dissociate while remaining inwardly-tapered shoulders spread the resilient fingers, allowing the coiled spring to eject the needle and its holder into the interior cavity of the syringe plunger.Field of SearchHaving means for preventing reuse of deviceHaving cover or protector for body entering conduit Entire body entering conduit stored in cavity in piston or piston actuator inside syringe prior to use Common cover or protector for body entering conduit and material syringe reservoir Cover or protector for body entering conduit movable axially relative to one another Having means to prevent fluid return to reservoir Mechanical means (e.g., piston, clamp, etc.) moved to collapse reservoir Means for preventing accidental displacement of piston Closable storage cavity included in piston or piston actuator | |
