Auto-Injection Syringe Having Vent Device
First Claim
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.
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Accused Products
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.
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Citations
20 Claims
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1. An auto-injection syringe comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An auto-injection syringe comprising:
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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. - View Dependent Claims (10, 11, 12, 13)
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14. An injection kit comprising:
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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. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification