Auto-Injection Syringe Having Vent Device

• US 20070078394A1
• Filed: 07/18/2006
• Published: 04/05/2007
• Est. Priority Date: 12/09/2004
• Status: Active Grant

• Current Assignee: West Pharmaceutical Services of Delaware, Inc. (West Pharmaceutical Services Incorporated)
• Original Assignee: West Pharmaceutical Services of Delaware, Inc. (West Pharmaceutical Services Incorporated)
• Inventors: Gillespie, Richard III
• Granted Patent: US 8,123,724 B2
• Time in Patent Office: Days
• US Class Current: 604/134
• CPC Class Codes: A61M 2005/206 With automatic needle insertion
• CPC Class Codes: A61M 2005/247 with fixed or steady piercing means, e.g. piercing under movement of ampoule
• CPC Class Codes: A61M 2005/3123 having air entrapping or venting means, e.g. purging channels in pistons
• CPC Class Codes: A61M 2005/31516 reducing dead-space in the syringe barrel after delivery
• CPC Class Codes: A61M 5/2033 Spring-loaded one-shot injectors with or without automatic needle insertion multishot dosing syringes A61M5/31525, needle insertion only A61M5/3287
• CPC Class Codes: A61M 5/2459 upon internal pressure increase, e.g. pierced or burst A61M5/2429 takes precedence
• CPC Class Codes: A61M 5/2466 by piercing without internal pressure increase A61M5/2429 takes precedence
• CPC Class Codes: A61M 5/3202 Devices for protection of the needle before use, e.g. caps A61M5/50 takes precedence; for infusion spikes A61M5/1626; protectors for sharps A61B50/3001
• 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

An auto-injection syringe is provided that includes an injection assembly and a retraction assembly operatively securable to the injection assembly. The retraction assembly includes a hypodermic needle having a needle hub, an end cap having a lower seal through which a portion of the hypodermic needle can pass, a retraction spring disposed between the needle hub and the end cap and maintained in a partially compressed condition therebetween, an upper seal urged against a facially sealing surface of the retraction assembly by the force of the retraction spring on the needle hub so that a sealed area is defined between the upper and lower seals, and a vent device in fluid communication with the sealed area for pressure equalization between the sealed area and an exterior of the retraction assembly.

Claims

1. An auto-injection syringe comprising:

a retraction assembly having a hypodermic needle maintained in a sealed area within said retraction assembly; and

a vent device in fluid communication between said sealed area for equalizing pressure between said sealed area and an exterior of said retraction assembly, wherein said vent device is a microbial filter.

2. The syringe of claim 1, further comprising an injection assembly operatively connectable to said retraction assembly.

3. The syringe of claim 2, further comprising a medicine cartridge being operatively insertable into said retraction assembly.

4. The syringe of claim 1, wherein said retraction assembly comprises an upper seal and a lower seal defining said sealed area therebetween, said upper seal being maintained in a sealing relation with a portion of said retraction assembly by a partially biased retraction spring.

5. The syringe of claim 4, wherein said lower seal comprises a penetrable elastomeric seal through which a portion of said hypodermic needle can pass.

6. The syringe of claim 1, wherein said vent device comprises a porous plastic end cap.

7. The syringe of claim 6, wherein said porous plastic end cap further comprises a penetrable elastomeric seal through which a portion of said hypodermic needle can pass.

8. The syringe of claim 1, wherein said sealed area is sterile.

9. An auto-injection syringe comprising:

an injection assembly; and

a retraction assembly being operatively securable to said injection assembly, said retraction assembly comprising;

a hypodermic needle having a needle hub,

an end cap having a lower seal through which a portion of said hypodermic needle can pass;

a retraction spring disposed between said needle hub and said end cap and maintained in a partially compressed condition therebetween,

an upper seal urged against a facially sealing surface of said retraction assembly by the force of said retraction spring on said needle hub so that a sealed area is defined between said upper and lower seals, said hypodermic needle being disposed in said sealed area; and

a vent device in fluid communication with said sealed area for pressure equalization between said sealed area and an exterior of said retraction assembly, wherein said vent device is a microbial filter.

10. The syringe of claim 9, further comprising a medicine cartridge for receipt in said injection and retraction assemblies when said assemblies are secured to one another.

11. The syringe of claim 9, further comprising an o-ring member forming a hermetic seal between said retraction assembly and said injection assembly when said retraction assembly is operatively secured to said injection assembly.

12. The syringe of claim 9, wherein said end cap comprises a thermoplastic material having sufficient porosity to allow for said pressure equalization so that said end cap is said vent device.

13. The syringe of claim 9, wherein said sealed area is sterile.

14. An injection kit comprising:

an injection assembly;

a retraction assembly having a hypodermic needle maintained in a sealed area within said retraction assembly, said retraction assembly being operatively connectable to said injection assembly; and

a vent device in fluid communication between said sealed area for equalizing pressure between said sealed area and an exterior of said retraction assembly, wherein said vent device is a microbial filter.

15. The injection kit of claim 14, wherein said retraction assembly comprises:

a needle hub secured to said hypodermic needle,

an end cap having a lower seal through which a portion of said hypodermic needle can pass;

a retraction spring disposed between said needle hub and said end cap and maintained in a partially compressed condition therebetween, and

an upper seal urged against a facially sealing surface of said retraction assembly by the force of said retraction spring on said needle hub so that said sealed area is defined between said upper and lower seals.

16. The injection kit of claim 15, further comprising a medicine cartridge for receipt in said injection and retraction assemblies when said assemblies are secured to one another.

17. The injection kit of claim 15, further comprising at least one injection site cleaning swab.

18. The injection kit of claim 15, further comprising an adhesive bandage.

19. The injection kit of claim 16, further comprising a package containing said injection and retraction assemblies.

20. The injection kit of claim 19, wherein said package is terminally sterilized.