Single use medical device with retraction mechanism
April 5, 2014. 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 3306290 Cannula insertion set with safety retracting needle Safe needle system for collecting fluids Retractable needle syringe Blood drawing apparatus Safety syringe Phlebotomy set with safety retracting needle Hypodermic syringe with retractable needle Retractable needle hypodermic syringe system Safety hypodermic syringe InventorApplicationNo. 222888 filed on 04/05/1994US Classes:604/110, Having means for preventing reuse of device604/195, Portion of body entering conduit stored in material receiving syringe reservoir604/218With piston or plunger for expelling material from body or injector reservoirExaminersPrimary: Yasko, John D.Attorney, Agent or FirmForeign Patent References
International ClassA61M 005/32AbstractA single use retractable syringe has three main parts which are coaxially arranged. An outer barrel is fitted with a slidable plunger and an elongated needle rod is carried within the plunger and biased for retraction. In the unretracted position of the needle rod, an injection needle is extended from the front of the barrel. The needle rod is held in the unretracted position by a resilient ring member frictionally mounted on one larger part of the needle rod just behind a reduced size front part of the needle rod. The needle communicates with a variable fluid chamber behind the resilient ring member below the front end of the plunger. After an injection, further depression of the plunger pushes the resilient ring member forward and off the larger diameter portion of the needle rod to release the needle rod which is biased to retract along with the needle into the plunger. The needle rod may be biased in the retraction direction by a spring or by a vacuum in the plunger behind the needle rod. The device is simple in operation and especially suited for mass production and robotic assembly. Retraction is reliable and permanent.Other References
Field of SearchHaving means for preventing reuse of deviceInjector or aspirator syringe supported only by person during use (e.g., hand held hypodermic syringe, douche tube with forced injection, etc.) Having cover or protector for body entering conduit Portion of body entering conduit stored in material receiving syringe reservoir Cover or protector for body entering conduit movable axially relative to one another With piston or plunger for expelling material from body or injector reservoir Removable cover or protector for body inserted conduit | |
