Hypodermic syringe with retractable needle
Patent 4955870 Issued on September 11, 1990. Estimated Expiration Date: 
August 23, 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.
August 23, 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 References 2722215 Safety syringe Patent #: 4874382 InventorsApplicationNo. 235437 filed on 08/23/1988US 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.Attorney, Agent or FirmInternational ClassA61M 005/00AbstractA hypodermic syringe including a barrel having a closed end, an open end, and an interior surface. A plunger is reciprocally received in the barrel through the open end and in sealing engagement with the interior surface of the barrel and forming a chamber. A hollow needle is detachably attached to the barrel at the closed end of the barrel. The plunger has a hole leading to a cavity. A spring is located within the cavity and is connected to the plunger at one end and a first mating member at the other end. The first mating member is detachably attached to the plunger end. A second mating member is attached to the needle. In operation, liquid is injected in a normal fashion by pushing the plunger toward the closed end of the barrel. When the plunger approaches the barrel closed end, the first and second mating members attach to one another. Further forward movement of the plunger first detaches the needle from the barrel and, thereafter, detaches the second mating member from the plunger and, thus, the spring draws the needle through the hole to within the cavity.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 Entire body entering conduit stored in cavity in piston or piston actuator inside syringe prior to use Injector or aspirator syringe supported only by person during use (e.g., hand held hypodermic syringe, douche tube with forced injection, etc.) Specific structure of means coupling piston to piston actuator With piston or plunger for expelling material from body or injector reservoir Material conduit forced into body by spring Removable cover or protector for body inserted conduit | |
