Disposable safety syringe having a retractable needle cannula and cannula lock
Patent 4908022 Issued on March 13, 1990. Estimated Expiration Date: 
August 15, 2008. 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.
August 15, 2008. 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 3923058 Two-chamber mixing syringe Syringe for storage and application of at least two injection media Wet-dry syringe Patent #: 4424057 InventorAssigneeApplicationNo. 232234 filed on 08/15/1988US Classes:604/195, Portion of body entering conduit stored in material receiving syringe reservoir604/110Having means for preventing reuse of deviceExaminersPrimary: Yasko, John D.Attorney, Agent or FirmInternational ClassA61M 005/32AbstractA disposable safety syringe comprising a cylinder which is prefilled with fluid medication, a double ended hypodermic needle cannula, and a cannula lock by which the needle cannula is supported in an axially extended position so that an injection of the fluid medication may be administered. The cannula lock includes a clamp having a pair of oppositely disposed jaws between which the cannula is releasably retained. The fluid medication is carried within the syringe cylinder between piston and plug members, each of which members having respective suction heads which are arranged in spaced, face-to-face alignment with one another. The piston member is advanceable axially and distally through the syringe cylinder whereby to expulse the medication from the cylinder and move the suction head of the piston member into air-tight sealing engagement with the suction head of the plug member at the distal end of the cylinder. The needle cannula penetrates the sealed piston and plug members, such that a retraction of the piston member axially and proximally through the cylinder causes a corresponding withdrawal and relocation of the cannula from the jaws of the cannula lock to the interior of the cylinder, where said cannula is completely surrounded and shielded to prevent a reuse of the cannula and an accidental needle stick.Field of SearchInjector or aspirator syringe supported only by person during use (e.g., hand held hypodermic syringe, douche tube with forced injection, etc.)Cover or protector for body entering conduit movable axially relative to one another Portion of body entering conduit stored in material receiving syringe reservoir Entire body entering conduit stored in cavity in piston or piston actuator inside syringe prior to use Used as piston actuator after removal from conduit covering or protecting position on syringe Having plural material reservoirs With piston or plunger for expelling material from body or injector reservoir Material reservoir (e.g., cartridge, etc.) removably mounted in syringe Material flow controlled by valve or movable closure (e.g., plug in orifice, etc.) Septum Means broken, cut, pierced or torn to permit mixing Closure or barrier between compartments moved to permit mixing Closure moved, expanded, or flexed by force transmitted by liquid Closure moved by relative movement between closure and separate protruding member Piston or piston actuator slidable in or against seal ring mounted on reservoir Specific structure of means coupling piston to piston actuator Conduit holder attached to another syringe component by thread means Conduit or holder therefor removably attached to another injector component by friction Having means for preventing reuse of device | |
