Injection Device
First Claim
1. An injection device comprising:
- a housing adapted to receive a syringe having a discharge nozzle;
first and second drive elements, of which the first is acted upon and the second acts upon the syringe to advance it from its retracted position to its extended position and discharge its contents through the discharge nozzle, the first drive element being capable of movement relative to the second when the former is acted upon and the latter is restrained by the syringe; and
a coupling that prevents the first drive element from moving relative to the second until they have been advanced to a nominal decoupling position relative to the syringe.
2 Assignments
0 Petitions
Accused Products
Abstract
An injection device (210; 110) is described. A housing (212; 112) receives a syringe and includes a return spring (226; 126) for biasing the syringe from an extended position in which its needle (218; 118) extends from the housing (212; 112) to a retracted position in which the it does not. A drive spring (230; 130) acts on a first drive element (232; 132) and a second drive element (234; 134) acts upon the syringe to advance it from its retracted position to its extended position and discharge its contents through the needle. The first drive element (232; 132) is capable of movement relative to the second (234; 134) once a nominal decoupling position has been reached. A release mechanism is activated when the first drive element (234; 134) is further advanced to a nominal release position, to release the syringe (214; 114) from the action of the drive spring (230; 130), whereupon the return spring (226; 126) restores the syringe (214; 114) to its retracted position. The nominal decoupling and release positions are defined relative to the syringe (214; 114). This may be achieved by interaction between a moving component and a decoupling component (162; 262) that moves with the syringe as it is advanced.
124 Citations
20 Claims
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1. An injection device comprising:
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a housing adapted to receive a syringe having a discharge nozzle; first and second drive elements, of which the first is acted upon and the second acts upon the syringe to advance it from its retracted position to its extended position and discharge its contents through the discharge nozzle, the first drive element being capable of movement relative to the second when the former is acted upon and the latter is restrained by the syringe; and a coupling that prevents the first drive element from moving relative to the second until they have been advanced to a nominal decoupling position relative to the syringe. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An injection device comprising:
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a housing adapted to receive a syringe having a discharge nozzle, the housing including means for biasing the syringe from an extended position in which the discharge nozzle extends from the housing to a retracted position in which the discharge nozzle is contained within the housing; first and second drive elements, of which the first is acted upon and the second acts upon the syringe to advance it from its retracted position to its extended position and discharge its contents through the discharge nozzle, the first drive element being capable of movement relative to the second when the former is acted upon and the latter is restrained by the syringe; a coupling that prevents the first drive element from moving relative to the second until they have been advanced to a nominal decoupling position; and a release mechanism, activated when the first drive element has been advanced to a nominal release position relative to the syringe that is more advanced than the said nominal decoupling position, and adapted to release the syringe, whereupon the biasing means restores the syringe to its retracted position. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification