Safety syringe
Patent 4874382 Issued on October 17, 1989. Estimated Expiration Date: 
October 15, 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.
October 15, 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 2722215 2841143 3825003 Needle-hub assembly for syringes Shielded needle Needle container and method for preventing accidental contact with a needle Retractable safety needle Cannula insertion set with safety retracting needle Dental syringe having an automatically retractable needle Patent #: 4767413 InventorsAssigneeApplicationNo. 109189 filed on 10/15/1987US Classes:604/195, Portion of body entering conduit stored in material receiving syringe reservoir604/198Cover or protector for body entering conduit movable axially relative to one anotherExaminersPrimary: Yasko, John D.Attorney, Agent or FirmInternational ClassA61M 005/00AbstractA safety syringe includes a protective sheath disposed within the interior of the body portion of the syringe. A needle extends from the body portion of the syringe when the syringe is in an armed condition. A biasing mechanism, such as a stretched coiled spring, is connected to the upper end of the needle and tends to draw the needle into the protective sheath. A releasable retainer mechanism engages a detent formed on the upper end of the needle to retain the needle in its extended position against the biasing force of the spring. After use, the releasable retainer mechanism is actuated either by the user or in response to movement of the syringe plunger, to release the detent formed on the needle and to cause the needle to be withdrawn into the protective sheath to prevent accidental contact with the sharpened end of the needle. In another embodiment of the invention, a telescoping sheath is held in a retracted condition adjacent the hub of the needle by a releasable retainer mechanism against the force of a biasing mechanism, such as a compressed coil spring. After use of the needle, the releasable retainer mechanism is actuated to effect extension of the telescoping sheath and to thereby enclose the needle to prevent accidental contact therewith.Field of SearchCover or protector for body entering conduit movable axially relative to one anotherAnd extended therefrom by piston when syringe is used 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 Injector or aspirator syringe supported only by person during use (e.g., hand held hypodermic syringe, douche tube with forced injection, etc.) Removable cover or protector for body inserted conduit Specific structure of means coupling piston to piston actuator | |
