Safety needle medical bearing devices

• US 7,329,238 B2
• Filed: 12/07/2000
• Issued: 02/12/2008
• Est. Priority Date: 12/07/1999
• Status: Expired due to Term

• Current Assignee: MDC Investment Holdings Incorporated (Becton, Dickinson & Co)
• Original Assignee: Specialized Health Products, Inc. (Becton, Dickinson & Co)
• Inventors: Barker, John, Botich, Michael J., Halseth, Thor R.
• Primary Examiner(s): Desanto; Matthew F.
• Application Number:
  US10/149,172
• Publication Number:
  US 20040116853A1
• Time in Patent Office: 2,623 Days
• Field of Search: 604/110, 604/181, 604/187, 604/188, 604192-198, 604/263
• US Class Current: 604/110
• CPC Class Codes: A61M 2005/3123 having air entrapping or venting means, e.g. purging channels in pistons
• CPC Class Codes: A61M 2005/3235 triggered by radial deflection of the anchoring parts between needle mount and syringe barrel or needle housing, e.g. spreading of needle mount retaining hooks having slanted surfaces by engagement with correspondingly shaped surfaces on the piston at the end of an injection stroke
• CPC Class Codes: A61M 2005/3238 Trigger provided at the proximal end, i.e. syringe end opposite to needle mounting end
• CPC Class Codes: A61M 2005/3261 triggered by radial deflection of the anchoring parts between sleeve and syringe barrel, e.g. spreading of sleeve retaining hooks having slanted surfaces by engagement with conically shaped collet of the piston rod during the last portion of the injection stroke of the plunger
• CPC Class Codes: A61M 2005/3263 Trigger provided at the distal end, i.e. syringe end for mounting a needle
• CPC Class Codes: A61M 5/283 by telescoping of ampoules or carpules with the 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
• CPC Class Codes: A61M 5/3234 Fully automatic needle retraction, i.e. in which triggering of the needle does not require a deliberate action by the user
• 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 5/508 Means for preventing re-use by disrupting the piston seal, e.g. by puncturing

Abstract

The present invention relates to a syringe (10) for administering injections of medicinal fluids to a patient or withdrawal of fluid, such as blood from a patient. More specifically the present invention is a syringe device (10) for injecting medication or withdrawing fluid, wherein after use the needle (60) is shielded (15) against inadvertent contact to prevent needle sticks.

Claims

1. A medical device, comprising:

a hollow barrel;

a plunger displaceable within the barrel to eject fluid from the barrel;

a needle assembly, comprising;

a needle having a sharpened tip, and

a needle hub fixedly attached to the needle,

wherein the needle assembly is operable between a projecting position in which the sharpened tip of the needle projects forwardly from the barrel and a retracted position in which the sharpened tip is retracted rearwardly;

a needle carrier in the barrel that is connectable with the needle hub,

wherein the needle carrier is positioned between the plunger and the needle hub, wherein a pin radially extends from the needle carrier;

means for biasing the needle carrier rearwardly;

means for releasably retaining the needle carrier against the bias of the biasing means, wherein the means for releasably retaining the needle carrier comprises a pin slot that is diagonal relative to axis of the needle and wherein the means for releasably retaining the needle carrier is located within the barrel;

wherein, upon pushing the rearward end of the plunger forwardly after ejection of fluid from the barrel, the plunger causes the needle carrier to rotate such that the pin moves relative to the pin slot to enable the means for releasably retaining the needle carrier to release the needle carrier, so that the biasing means displaces the needle carrier rearwardly until the sharpened tip of the needle is shielded within the barrel.

2. The medical device of claim 1 comprising means for locking the plunger in a rearward position after the needle is retracted.

3. The medical device of claim 1 wherein the needle hub comprises a first connector and the needle carrier comprises a second connector cooperable with the first connector for attaching the needle assembly to the needle carrier.

4. The medical device of claim 1 comprising means for providing a fluid-tight seal between the barrel and the needle carrier.

5. The medical device of claim 1 wherein the biasing means is disposed between the needle carrier and the means for releasably retaining the needle carrier.

6. The medical device of claim 1 comprising means for circumferentially aligning the means for releasably retaining the needle carrier.

7. A medical device, comprising:

a hollow barrel;

a plunger displaceable within the barrel to eject fluid from the barrel;

a needle assembly, comprising;

a needle having a sharpened tip, and

a needle hub fixedly attached to the needle,

wherein the needle assembly is operable between a projecting position in which the sharpened tip of the needle projects forwardly from the barrel and a retracted position in which the sharpened tip is retracted rearwardly;

a needle carrier in the barrel that is connectable with the needle hub,

wherein the needle carrier is positioned between the plunger and the needle hub, wherein a pin radially extends from the needle carrier;

a coil spring positioned to bias the needle carrier rearwardly;

a collar operable to releasably retain the needle carrier against the bias of the coil spring, wherein the collar comprises a pin slot that is diagonal relative to axis of the needle and wherein the collar is located within the barrel;

wherein, upon pushing the rearward end of the plunger forwardly after ejection of fluid from the barrel, the plunger causes the needle carrier to rotate such that the pin moves relative to the pin slot to enable the collar to release the needle carrier, so that the coil spring displaces the needle carrier rearwardly until the sharpened tip of the needle is shielded within the barrel.

8. The medical device of claim 7 comprising a lock for locking the plunger in a rearward position after the needle is retracted.

9. The medical device of claim 7 wherein the needle hub comprises a first connector and the needle carrier comprises a second connector cooperable with the first connector for attaching the needle assembly to the needle carrier.

10. The medical device of claim 7 comprising a seal for providing a fluid-tight seal between the barrel and the needle carrier.

11. The medical device of claim 7 wherein the coil spring is disposed between the needle carrier and the collar.

12. The medical device of claim 7 comprising an alignment element for circumferentially aligning the collar.