Disposable safety medical syringe

• US 4,955,868 A
• Filed: 10/04/1989
• Issued: 09/11/1990
• Est. Priority Date: 11/28/1988
• Status: Expired due to Fees

• Current Assignee: Klein, Edward
• Original Assignee: Klein, Edward
• Inventors: Klein, Edward
• Primary Examiner(s): YASKO JR, JOHN D
• Application Number:
  US07/418,819
• Time in Patent Office: 342 Days
• Field of Search: 604/198, 604/195, 604/110, 604/192, 604/263, 604/187
• US Class Current: 604/198
• CPC Class Codes: A61B 5/15003 for venous or arterial blood
• CPC Class Codes: A61B 5/150244 Rods for actuating or driving the piston, i.e. the cylindrical body that sits inside the syringe barrel, typically with an air tight seal, and slides in the barrel to create a vacuum or to expel blood
• CPC Class Codes: A61B 5/150259 Improved gripping, e.g. with high friction pattern or projections on the housing surface or an ergonometric shape
• CPC Class Codes: A61B 5/150389 Hollow piercing elements, e.g. canulas, needles, for piercing the skin
• CPC Class Codes: A61B 5/150503 Single-ended needles hollow piercing element tip design A61B5/150396, needle sets for catheters A61M25/06, needles for bringing media into the body A61M5/32
• CPC Class Codes: A61B 5/150656 semi-automatically triggered, i.e. in which the triggering of the protective sleeve requires a deliberate action by the user, e.g. manual release of spring-biased extension means
• CPC Class Codes: A61B 5/150709 semi-automatically removed, i.e. before puncturing the protection is removed by a mechanism initiated by a deliberate action by the user, such as pressing a button
• CPC Class Codes: A61B 5/153 Devices specially adapted for taking samples of venous or arterial blood, e.g. with syringes
• CPC Class Codes: A61M 5/326 Fully automatic sleeve extension, i.e. in which triggering of the sleeve does not require a deliberate action by the user

Abstract

A modification of a hypodermic syringe shielding the needle from user so that inadvertant puncture to the user of syringe will not occur before, during or after the injection of subject. This modification removes the necessity for capping or recapping the syringe. It is an improvement over prior devices in that the hypodermic needle is moved out of shield with out pressure of the syringe on subject being injected allowing for full view of needle during injection making venipuncture possible. The needle retracts automatically back in shield with release of pressure on shield handle (5) and syringe handle (7) by means of spring (2). Gasket (3) prevents movement of needle in shield by unintentional forces, and the plunger rod handle operates independently of retracting or protracting needle allowing for filling of syringe, aspiration of syringe and injecting with syringe. This device allows the safe use of a medical hypodermic syringe with out fear of contracting diseases the subject being injected may have by inadvertant puncture of user afer injecting subject. It also gives operator full visability of needle, control of needle and indendent action of exposing and needle and injecting with syringe or withdrawing blood of patient through springe.

Claims

1. A shield for use with a conventional unitary hypodermic syringe having a tubular body, piston and needle comprising a unitary cylindrical jacket of fixed length for enclosing and holding said hypodermic syringe partially within said jacket, said jacket having a constricted opening at one end for passage of the hypodermic needle of said syringe in response to displacement of the syringe within said jacket and being open at its other end to permit emplacement of said syringe so that the syringe piston and the portion of the syringe body proximate thereto extend beyond said jacekt and such that movement of said syringe piston in either direction within the tubular body of the syringe is independent of either said jacket or movement of the syringe body within said jacket, resilient spring means disposed within said jacket proximate to said constricted opening and around said syringe needle for maintaining said syringe in a retracted position within said jacket but permitting said unrestricted longitudinal displacement of the syringe in either direction within the jacket to cause passage of the needle through said constricted opening in the unitary jacket.