Inclined plane latching device for a spring needle cannula and a spring needle

• US 6,235,003 B1
• Filed: 10/12/1999
• Issued: 05/22/2001
• Est. Priority Date: 10/12/1999
• Status: Expired due to Fees

• Current Assignee: Edward D. Dysarz
• Original Assignee: Edward D. Dysarz
• Inventors: Dysarz, Edward D.
• Primary Examiner(s): Nguyen, Anhtuan T.
• Application Number:
  US09/415,251
• Time in Patent Office: 588 Days
• Field of Search: 604/110, 604/192, 604/195, 604/197, 604/198, 604/162, 604/164.04, 604/164.08, 604/164.12, 604/165.01, 604/170.05, 604/240-243, 604/161
• US Class Current: 604/195
• CPC Class Codes: A61M 2005/3206 Needle or needle hub disconnecting devices forming part of or being attached to the hub or syringe body
• CPC Class Codes: A61M 5/3232 Semi-automatic needle retraction, i.e. in which triggering of the needle retraction requires a deliberate action by the user, e.g. manual release of spring-biased retraction means

Abstract

A spring needle cannula with a first end and a second end wherein said first end is inserted into a body to inject medicament into said body and wherein the second end of said spring needle cannula is formed into a coiled spring and wherein said coiled spring is stretched into a biased spring needle cannula and contained in a modular hub chamber and wherein said first end of said spring needle cannula extends from a tunnel formed in said first end of said modular hub chamber and wherein said second end of said needle cannula is formed into a biased spring cannula and held between an inclined plane latching means and a flange, fixed to a ridge formed at the second end of said modular hub chamber. To release said biased spring needle cannula after said spring needle cannula has been used to inject medicament into a body, a button is depressed thus releasing the biased spring needle from said inclined plane latching means thereby releasing said biased spring needle allowing said biased spring needle cannula to form a coil near said second end of said hub chamber and thus retracting said first end of said needle into said modular hub chamber thereby rendering said needle harmless from an accidental needle prick. The inclined plane latching device may be used on a needle cannula or on a needle for an IV catheter.

Claims

1. A latch and release means for latching and releasing a biased spring needle contained in a syringe or an IV catheter Comprised:

a hub chamber with a first end and a second end wherein said hub chamber is an elongated hollow tube;

a biased spring needle with a first end extending past said first end of said hub chamber and second end fixed near said second end of said hub chamber;

a cannula push out hook wherein said cannula push out hook is fixed to said spring needle and wherein said cannula push out hook has a first inclined plane formed at one end of said cannula push out hook;

a latch foundation wherein said latch foundation is formed on said hub chamber or fixed to said hub chamber and wherein said latch foundation has a second inclined plane formed on said latch foundation and wherein said second inclined plane is engaged with said first inclined plane formed on needle push out hook;

a cannula release button with a first end and second end wherein said second end of said cannula release button is near said cannula pushout hook and wherein said first end of said cannula release button is pushed thereby thrusting said cannula push out hook away from said latch foundation thereby disengaging said first inclined plane formed on said cannula push out hook from said second inclined plane formed on said latch foundation thereby allowing said second end of said spring needle to pull said first end of said spring needle into said hub chamber thereby preventing any reuse or accidental prick from said first end of said needle.

2. A latch and release means of claim 1 wherein said latch and release means may be used on an IV catheter.

4. A latch and release means of claim 1 wherein said latch foundation is formed on a hub chamber cap.

5. A latch and release means of claim 1 wherein said cannula release button has a second knob formed near the second end of said cannula release button wherein said second knob prevents said cannula release button from falling out of said hub chamber.

6. The latch and release means of claim 1 wherein said cannula push out hook has a hole formed near said third end wherein said hole extends from said first to said second end of said cannula push out hook and wherein said needle is disposed in said hole.

3. A latch and release means of claim one wherein said latch and release means may be used on a syringe.