Multiple dosage injector
First Claim
1. A dispensing mechanism comprising:
- a housing;
a medicament chamber associated with the housing and configured to contain medicament;
a plunger rod configured to eject successive doses of medicament from the medicament chamber;
an actuation mechanism including a trigger and a driver, the driver rotatably associated with the housing and the trigger configured to move with respect to the housing between a ready position and a fired position, the trigger configured to be manipulated by a user for successive movement in;
a dosing motion from the ready position to the fired position generally in axial translation in which the trigger is associated with the plunger rod to cause the plunger rod to eject one of the successive doses of medicament, anda resetting motion from the fired position to the ready position that comprises movement of the trigger without movement of the plunger rod; and
a nut configured to receive the plunger rod, the nut including a ramp configured to allow rotation of the driver in a driving direction and prevent rotation of the driver in a direction opposite to the driving direction.
1 Assignment
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Accused Products
Abstract
A medicament dispensing mechanism is disclosed that is configured to eject successive doses of the medicament from a medicament chamber. An embodiment of the dispensing mechanism includes a housing and a plunger rod configured for ejecting the doses of medicament from the chamber. The dispensing mechanism further includes an actuation mechanism that comprises a trigger associated with the housing and having a ready and a fired position with respect thereto. The trigger is configured for manipulation by a user for successive movement in a generally axial dosing motion from the ready position to the fired position in which the trigger is associated with the plunger rod to cause the plunger rod to eject one of the doses of a predetermined volume and a resetting motion from the fired position to the ready position that comprises axial rotation, wherein the trigger is uncoupled from the plunger rod during the resetting motion.
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Citations
20 Claims
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1. A dispensing mechanism comprising:
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a housing; a medicament chamber associated with the housing and configured to contain medicament; a plunger rod configured to eject successive doses of medicament from the medicament chamber; an actuation mechanism including a trigger and a driver, the driver rotatably associated with the housing and the trigger configured to move with respect to the housing between a ready position and a fired position, the trigger configured to be manipulated by a user for successive movement in; a dosing motion from the ready position to the fired position generally in axial translation in which the trigger is associated with the plunger rod to cause the plunger rod to eject one of the successive doses of medicament, and a resetting motion from the fired position to the ready position that comprises movement of the trigger without movement of the plunger rod; and a nut configured to receive the plunger rod, the nut including a ramp configured to allow rotation of the driver in a driving direction and prevent rotation of the driver in a direction opposite to the driving direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification