Safety hypodermic syringe
Patent 5019044 Issued on May 28, 1991. Estimated Expiration Date: 
August 14, 2009. 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 14, 2009. 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 ReferencesSingle use disposable hypodermic syringe Retractable needle syringe Patent #: 4838869 InventorApplicationNo. 393390 filed on 08/14/1989US 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 safety hypodermic syringe includes a hypodermic needle fixedly connected to holder plate and constantly supported by a spring means for making axial movement, which holder plate is normally retained by a clamping means at a ready position for injection. When a plunger is pushed to the front limit, the hypodermic needle becomes released from the constraint of the clamping means and pushed by the spring means to drop and to further follow a rubber plug to be squeezed into the inner chamber of the plunger so as to isolate from outside and to prevent from pricking accident or possible body fluid contact.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.) Material conduit forced into body by spring With piston or plunger for expelling material from body or injector reservoir Means for preventing accidental displacement of piston Portion of body entering conduit stored in material receiving syringe reservoir | |
