Prefilled hypodermic syringe system
First Claim
1. An injection device for use with a needle assembly comprising:
- a syringe body having a fluid chamber formed therein for retaining an injection fluid, said syringe body having an outlet for dispensing fluid from said fluid chamber, anda plunger assembly including a plunger slidably disposed in said fluid chamber for creating positive pressures to cause ejection of a fluid from said fluid chamber and an actuator, said actuator being movable relative to said plunger between a first position, with at least a portion of said actuator positioned in said fluid chamber between said outlet and said plunger, and a second position, with said actuator positioned to engage said plunger and drive said plunger through said fluid chamber to create said positive pressures.
2 Assignments
0 Petitions
Accused Products
Abstract
A hypodermic syringe and method of filling the syringe with an injection fluid. The syringe includes a fluid chamber for retaining an injection fluid and a plunger assembly for expelling fluid from the chamber. The plunger assembly includes a plunger slidably disposed in the fluid chamber for creating positive pressures to cause ejection of a fluid from the chamber and an actuator coupled to the plunger for movement of the actuator between a first position with the actuator released for movement of the actuator through the fluid chamber relative to the plunger and a second position with the actuator in cooperative engagement with the plunger for driving the plunger to create the positive pressures.
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Citations
17 Claims
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1. An injection device for use with a needle assembly comprising:
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a syringe body having a fluid chamber formed therein for retaining an injection fluid, said syringe body having an outlet for dispensing fluid from said fluid chamber, and a plunger assembly including a plunger slidably disposed in said fluid chamber for creating positive pressures to cause ejection of a fluid from said fluid chamber and an actuator, said actuator being movable relative to said plunger between a first position, with at least a portion of said actuator positioned in said fluid chamber between said outlet and said plunger, and a second position, with said actuator positioned to engage said plunger and drive said plunger through said fluid chamber to create said positive pressures. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An injection device for use with a needle assembly comprising:
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a syringe body having a fluid chamber formed therein for retaining an injection fluid, said syringe body having an outlet for dispensing fluid from said fluid chamber, and a plunger assembly including a plunger slidably disposed in said fluid chamber for creating positive pressures to cause ejection of a fluid from said fluid chamber and an actuator releasably coupled to said plunger for movement of said actuator between a first position with said actuator released for movement of said actuator through said fluid chamber relative to said plunger and a second position with said actuator in cooperative engagement with said plunger for driving said plunger to create said positive pressures, said actuator including sealing means for sealing said outlet of said fluid chamber, said sealing means being movable away from said outlet for breaking said seal upon retraction of said actuator from said fluid chamber.
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13. An injection device for use with a needle assembly comprising:
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a syringe body having a fluid chamber formed therein for retaining an injection fluid, said syringe body having an outlet for dispensing fluid from said fluid chamber and a plunger assembly including a plunger slidably disposed in said fluid chamber for creating positive pressures to cause ejection of a fluid from said fluid chamber and an actuator releasably coupled to said plunger for movement of said actuator between a first position with said actuator released for movement of said actuator through said fluid chamber relative to said plunger and a second position with said actuator in cooperative engagement with said plunger for driving said plunger to create said positive pressures, and supply means for filling said fluid chamber with said injection fluid. - View Dependent Claims (14, 15)
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16. An injection device for use with a needle assembly comprising:
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a syringe body having a fluid chamber formed therein for retaining an injection fluid, said syringe body having an outlet for dispensing fluid from said fluid chamber, and a plunger assembly including a plunger slidably disposed in said fluid chamber for creating positive pressures to cause ejection of a fluid from said fluid chamber and an actuator releasably coupled to said plunger for movement Of said actuator between a first position with said actuator released for movement Of said actuator through said fluid chamber relative to said plunger and a second position with said actuator in cooperative engagement with said plunger for driving said plunger to create said positive pressures, and further comprising a needle assembly coupled to said syringe body, said needle assembly including a protective sheath mountable to said syringe body and a needle carriage slidably positioned within said sheath, said needle carriage being movable between a forward position with said needle projecting from said front end of said sheath and a retracted position with said needle positioned inside of said sheath. - View Dependent Claims (17)
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Specification