Retractable needle syringe
Patent 4838869 Issued on June 13, 1989. Estimated Expiration Date: 
July 22, 2008. 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.
July 22, 2008. 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 Patent #: 4747831 InventorApplicationNo. 07/223077 filed on 07/22/1988US 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.International ClassA61M 5/32 (20060101)AbstractA retractable hypodermic needle configured for one-time use wherein the needle is spring loaded and automatically irretrievably retracted into the hypodermic syringe when the syringe plunger is fully depressed, whereby protrusions on the end of the plunger engage tabs holding the spring loaded needle to release the needle for retraction.Field of SearchPortion of body entering conduit stored in material receiving syringe reservoirEntire body entering conduit stored in cavity in piston or piston actuator inside syringe prior to use Cover or protector for body entering conduit movable axially relative to one another Injector or aspirator syringe supported only by person during use (e.g., hand held hypodermic syringe, douche tube with forced injection, etc.) Having means for preventing reuse of device Material conduit forced into body by spring | |
