Hypodermic needle with protection device

• US 5,554,131 A
• Filed: 05/24/1994
• Issued: 09/10/1996
• Est. Priority Date: 07/13/1992
• Status: Expired due to Fees

• Current Assignee: Pia Carpinelli
• Original Assignee: Pia Carpinelli
• Inventors: Lacivita, Antonio
• Primary Examiner(s): Yasko, John D.
• Assistant Examiner(s): STRIGHT, RONALD K
• Application Number:
  US08/199,162
• Time in Patent Office: 840 Days
• Field of Search: 604/110, 604/192, 604/198, 604/263, 604/162, 604/167
• US Class Current: 604/198
• CPC Class Codes: A61M 2005/3109 Caps sealing the needle bore by use of, e.g. air-hardening adhesive, elastomer or epoxy resin
• CPC Class Codes: A61M 2005/325 Means obstructing the needle passage at distal end of a needle protection sleeve
• CPC Class Codes: A61M 5/3243 being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel devices for protecting guide needles in combination with catheters A61M25/0612
• CPC Class Codes: A61M 5/3257 Semi-automatic sleeve extension, i.e. in which triggering of the sleeve extension requires a deliberate action by the user, e.g. manual release of spring-biased extension means
• 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
• CPC Class Codes: A61M 5/3271 with guiding tracks for controlled sliding of needle protective sleeve from needle exposing to needle covering position
• CPC Class Codes: A61M 5/3272 having projections following labyrinth paths

Abstract

A hypodermic needle provided with a protection device against infection risks, substantially comprising a cap (1), or a hollow member shaped like a cylinder or a truncated cone, with piercing-resistant walls (3) having an inner irregular profile (5), which member can be snap-secured to the base (7) supporting the needle (9), and provided at its base (7) with a resilient element (13) formed like a coil or sheath and exhibiting a marked propelling capability, and with a preferably eccentric hole (17) at the tip (15) thereof.

Claims

1. A hypodermic needle with an after-use protection device against infection risks, comprising a cap (1) or a hollow member having a cylindrical or truncated cone shape, with piercing-resistant walls (3) having an inner irregular profile (5), a base (7) and said cap being snap-secured to the base (7) supporting the needle (9), and provided at its base (7) with a resilient element (13) with a marked propulsive capability, and at the other end (15) with a preferably eccentric hole (17), wherein inside the cavity (19) of the cap (1) there is provided a pocket (21), outwardly defined by the cap walls (3) and inwardly by a pierceable metal foil (23), said pocket containing an adhesive and air-hardening material (25), in case supported by a resilient spongy material, and

wherein the cap (1) is locked to the base (7) of the needle, by a series of cooperating snap retainers (27) located on the inner wall of the cap (1) and on the outer wall of the needle base (7) mating the cap (1) whereby a short manually imparted displacement of the cap (1) causes the cap to be released from the base (7), and allows it to spring upward to wholly shelter the needle (9), with said displacement that can be imparted even with the needle (9) still inserted in the skin, so that the cap (1) is released and springs forward to shelter the exposed portion of the needle (9), and remains ready to wholly cover it, as soon as it will be extracted from the skin.

2. A hypodermic needle with an after-use protection device against infection risks, characterized in that it comprises a cap (1) or a hollow member having a cylindrical or truncated cone shape, with piercing-resistant walls (3) having an inner irregular profile (5), a base (7), and said cap being snap-secured to the base (7) supporting the needle (9), and provided at its base (7) with a resilient element (13) with a marked propulsive capability, and at the other end (15) with a preferably eccentric hole (17) wherein the cap (1) is linked to the base (7) of the needle (9) by a lever device (31 or 33), pivotally secured to the wall of the base (7) and cooperating with a recess (35) in the wall (3) of the cap (1) whereby as soon as the needle (9) is inserted into the skin, the fluid displaced by the syringe piston acts upon said lever element (31, 33) and causes it to rotate enough to disengage it from the recess (35) provided in the cap (1), thus allowing the action of the cap propulsion means (13).