Self-destructive syringe

• US 20050240149A1
• Filed: 04/23/2004
• Published: 10/27/2005
• Est. Priority Date: 04/23/2004
• Status: Abandoned Application

• Current Assignee: Chun Hui Lu
• Original Assignee: Chun Hui Lu
• Inventors: Lu, Chun Hui
• Application Number:
  US10/829,966
• Publication Number:
  US 20050240149A1
• Time in Patent Office: Days
• US Class Current: 604/110
• CPC Class Codes: A61M 2005/31516 reducing dead-space in the syringe barrel after delivery
• CPC Class Codes: A61M 5/5013 Means for blocking the piston or the fluid passageway to prevent illegal refilling of a syringe

Abstract

A self-destructive syringe including a barrel, a plunger in the barrel, and a needle head adapted with a needle, a plunger holder at the front end of the plunger comprised of a primary anda secondary tapers each provided with a ring plug, a fixation ring holder and a locking member; a hollow needle holder formed at the front end of the barrel to accommodate the needle head; a limiting part in the needle holder; upon completing the injection, both of the ring plug, the secondary taper, the fixation ring holder and the locking member being left in the barrel, and the plunger and the primary taper being pulled out of barrel to prevent reuse of the syringe.

Claims

1. An improved structure of a self-destructive syringe includes a plunger, having at its rear end disposed with a flange and its front end, a plunger fixation holder;

the plunger holder being provided in sequence a primary taper, a secondary taper, a fixation ring holder and a locking member with the primary taper having its tip to contact a base of the secondary taper;

a ring plug being provided to the primary taper, the secondary taper, and the fixation ring holder so that the primary taper, the secondary taper and the fixation ring holder being inserted through a hole provided on the ring plug;

the locking member being exposed out of the front end of the ring plug;

a barrel having at its rear end provided with a flange and at its front end formed with a hollow needle holder for the insertion of a needle head;

a limiting part being formed inside the needle holder; and

a needle head having its one end fixed to a needle and received in the needle holder;

upon completing the injection of the liquid in the barrel, the plunger being further pushed all way down the barrel;

the locking member being pushed into the needle holder to be interlocked with the limiting part;

the plunger being pulled back to separate both of the primary and the secondary tapers from each other;

the ring plug, the secondary taper therein and the fixation ring holder being stuck in the needle holder by means of the locking member;

the ring plug, the secondary taper, the fixation ring holder and the locking member all being left in the barrel, and the plunger and the primary taper being pulled out of the barrel to prevent any attempted reuse of the syringe.

2. An improved structure of a self-destructive syringe as claimed in claim 1, wherein, a guide is formed at where appropriately on the locking member;

one side of the guide facing the fixation ring holder being externally enlarged; and

a locking side being inwardly formed at the bottom of the guide.

3. An improved structure of a self-destructive syringe as claimed in claim 1, wherein, an opening is provided at where appropriately on the locking member.

4. An improved structure of a self-destructive syringe as claimed in claim 1, wherein, a scale is provided on the body of the barrel.

5. An improved structure of a self-destructive syringe as claimed in claim 1, wherein, a cap is provided to cover up the needle of the needle head.