Automatic injection and retraction syringe
First Claim
1. An injection and retraction syringe, comprising:
- a medicine cartridge;
an injection assembly; and
a retraction assembly being selectively securable to said injection assembly to house said medicine cartridge therein, said retraction assembly comprising;
an end cap,a hypodermic needle having a needle hub,a retraction spring disposed between said needle hub and said end cap and maintained in a partially compressed condition therebetween, andan upper seal urged against a facially sealing surface perpendicular to a radial sealing surface of an inner diameter of said retraction assembly by said retraction spring in said partially compressed condition to form a first hermetic seal.
2 Assignments
0 Petitions
Accused Products
Abstract
An automatic injection and retraction syringe having a medicine cartridge, an injection assembly, and a retraction assembly is provided. The retraction assembly is selectively securable to the injection assembly to house the medicine cartridge. The retraction assembly includes an end cap, a hypodermic needle, a retraction spring, and an upper seal. The retraction spring is maintained in a partially compressed condition between the needle hub and the end cap. The upper seal is urged against a sealing surface by the retraction spring in the partially compressed condition to form a hermetic seal. In some embodiments, the injection assembly includes an injection spring, a plunger engaged to the injection spring, and a safety element to prevent the plunger from escaping the injection assembly if the injection spring is released from the normally stressed condition before the assemblies are secured to one another.
199 Citations
6 Claims
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1. An injection and retraction syringe, comprising:
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a medicine cartridge; an injection assembly; and a retraction assembly being selectively securable to said injection assembly to house said medicine cartridge therein, said retraction assembly comprising; an end cap, a hypodermic needle having a needle hub, 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 perpendicular to a radial sealing surface of an inner diameter of said retraction assembly by said retraction spring in said partially compressed condition to form a first hermetic seal. - View Dependent Claims (2, 3, 4)
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5. An injection and retraction syringe, comprising;
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a medicine cartridge; an injection assembly; a retraction assembly being selectively securable to said injection assembly to house said medicine cartridge therein, said retraction assembly comprising; an end cap, a hypodermic needle having a needle hub, 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 said retraction spring in said partially compressed condition to form a first hermetic seal; and an o-ring member forming a second hermetic seal between said retraction assembly and said injection assembly when said retraction assembly is secured to said injection assembly.
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6. An injection and retraction syringe comprising:
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a medicine cartridge; an injection assembly; a retraction assembly being selectively securable to said injection assembly to house said medicine cartridge therein, said retraction assembly comprising; an end cap, a hypodermic needle having a needle hub, 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 said retraction spring in said partially compressed condition to form a first hermetic seal; and wherein said injection assembly comprises one or more outwardly depending tabs for receipt in a corresponding number of openings defined in said retraction assembly when said retraction assembly is secured to said injection assembly.
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Specification