Auto-injection syringe having vent device
First Claim
1. An auto-injection syringe comprising:
- a retraction assembly having;
a hypodermic needle and a needle hub connected to the hypodermic needle,an upper seal urged against and in contact with a distally facing sealing surface perpendicular to a radial sealing surface of an inner diameter of said retraction assembly by a force of a retraction spring on said needle hub, anda lower seal, wherein the upper seal and the lower seal define a sealed area, andwherein the hypodermic needle and the needle hub connected to the hypodermic needle are maintained in the 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 and a needle hub connected to the hypodermic needle, an upper seal urged against and in contact with a distally facing sealing surface perpendicular to a radial sealing surface of an inner diameter of said retraction assembly by a force of a retraction spring on said needle hub, and a lower seal, wherein the upper seal and the lower seal define a sealed area, and wherein the hypodermic needle and the needle hub connected to the hypodermic needle are maintained in the 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 and in contact with a distally facing 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 and needle hub 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 and a needle hub connected to the hypodermic needle, an upper seal urged against and in contact with a distally facing sealing surface perpendicular to a radial sealing surface of an inner diameter of said retraction assembly by a force of a retraction spring on said needle hub, and a lower seal, wherein the upper seal and the lower seal define a sealed area, and wherein the hypodermic needle and the needle hub connected to the hypodermic needle are maintained in the sealed area within said retraction assembly, said retraction assembly being operatively connectable to said injection assembly; and a vent device in fluid communication with 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