Coupling for an auto-injection device
First Claim
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1. A power injection assembly, comprising:
- a plunger rod having a rib;
an injection spring;
an inner housing having a first opening and an inner diameter, said injection spring surrounding said inner housing and said plunger rod being disposed in said inner diameter; and
a coupling having a spring rest and a shoulder, said coupling being disposed in said inner diameter such that said spring rest extends through said first opening and receives said injection spring and such that said shoulder is compressed to a first position by said inner diameter, said shoulder being engaged with said rib in said first position.
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Abstract
A coupling for selectively securing a spring to a plunger is provided. The coupling has a first end defining a spring rest for receiving the spring and a second end defining a shoulder. The shoulder is moveable to a first position into contact with the plunger and to a second position out of contact with the plunger. The shoulder is normally in the second position and is resiliently moveable to the first position.
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Citations
8 Claims
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1. A power injection assembly, comprising:
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a plunger rod having a rib; an injection spring; an inner housing having a first opening and an inner diameter, said injection spring surrounding said inner housing and said plunger rod being disposed in said inner diameter; and a coupling having a spring rest and a shoulder, said coupling being disposed in said inner diameter such that said spring rest extends through said first opening and receives said injection spring and such that said shoulder is compressed to a first position by said inner diameter, said shoulder being engaged with said rib in said first position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification