Disposable syringe with automatic needle retraction
Patent 5000736 Issued on March 19, 1991. Estimated Expiration Date: 
March 22, 2010. 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.
March 22, 2010. 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 3008570 3107785 3895633 Injection syringe with cartridge retaining tab Syringe package with evidence of opening Syringe assembly Shielded hypodermic syringe Self-resheathing needle assembly Latch integral with latched apparatus Safety blood donor apparatus InventorsAssigneeApplicationNo. 497458 filed on 03/22/1990US Classes:604/110, Having means for preventing reuse of device604/195Portion of body entering conduit stored in material receiving syringe reservoirExaminersPrimary: Yasko, John D.Attorney, Agent or FirmInternational ClassA61M 005/00AbstractA medicinal syringe including a tubular plunger from which air has been evacuated and a seal member releasably attached on the distal end of the plunger. Upon application of a predetermined longitudinal axial force to the seal member, the attachment between the seal member and the plunger will rupture, releasing the seal member for movement within the plunger. The seal member when released will be forced by the differential pressure between the vacuum and the ambient air into the interior of the tubular plunger. The plunger is slidably disposed in a tubular barrel. A needle is disposed in a hub releasably attached within the distal end of the barrel. Upon application of a predetermined longitudinal axial force to the hub, the attachment between the hub and the barrel will rupture, releasing the hub for movement within the barrel. The hub when released will be forced by the pressure differential, along with the distal plunger seal member, into the interior of the tubular plunger, carrying the needle with it. The attachment between the hub and barrel is adapted to rupture prior to that between the seal member and plunger. Once drawn into the tubular plunger, the needle and hub will remain there indefinitely, thus eliminating accidental puncturing by the needle of a person in the vicinity of the syringe.Field of SearchHaving means for preventing reuse of devicePortion of body entering conduit stored in material receiving syringe reservoir Injector 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 With piston or plunger for expelling material from body or injector reservoir By detent Removable cover or protector for body inserted conduit Cover or protector for body entering conduit movable axially relative to one another | |
