Trap in barrel one handed retractable safety syringe
Patent 4978343 Issued on December 18, 1990. Estimated Expiration Date: 
March 6, 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 6, 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 ReferencesCannula insertion set with safety retracting needle Safe needle system for collecting fluids Button activated automatic needle sheath for disposable syringe Safety syringe Patent #: 4874382 InventorsApplicationNo. 488613 filed on 03/06/1990US Classes:604/195, Portion of body entering conduit stored in material receiving syringe reservoir604/110, Having means for preventing reuse of device604/198Cover or protector for body entering conduit movable axially relative to one anotherExaminersPrimary: Yasko, John D.International ClassA61M 005/32AbstractA disposable hypodermic syringe having a needle cannula fixed to a piston assembly. The piston assembly is held within the elongated hollow barrel of said hypodermic syringe by a compressed spring and a trigger. When said trigger is disengaged with said piston assembly said spring pushes said piston assembly and said needle cannula into said barrel of said hypodermic syringe and holds said needle cannula fixed to said piston assembly within said barrel and is further prevented from being pushed out of said elongated hollow barrel by a rim in said elongated hollow barrel thus preventing any accidental injection of bacteria, virus or other undesirable material into others. The disengagement of said trigger with said piston assembly is accomplished with only one and the same hand that is used to inject the needle cannula and medicament into a body.Field of SearchPortion of body entering conduit stored in material receiving syringe reservoirCover or protector for body entering conduit movable axially relative to one another Having means for preventing reuse of device 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 With piston or plunger for expelling material from body or injector reservoir | |
