Multiple dosage injector
First Claim
1. A medicament 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 the medicament from the chamber;
an actuation mechanism that comprises a trigger associated with the housing and having a ready position and a fired position with respect thereto, the trigger being configured for manual engagement 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 the medicament, anda resetting motion from the fired position to the ready position, wherein the trigger is uncoupled from the plunger rod during the resetting motion,an anti-retrograde mechanism associated with the actuation mechanism for preventing rearward movement thereof against the direction of operation of the actuation mechanism through at least a portion of the dosing and resetting motions; and
a lockout mechanism comprising an flexible arm engageable with the trigger to prevent movement of the trigger relative to the after a final dose has been administered.
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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.
425 Citations
21 Claims
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1. A medicament 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 the medicament from the chamber; an actuation mechanism that comprises a trigger associated with the housing and having a ready position and a fired position with respect thereto, the trigger being configured for manual engagement 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 the medicament, and a resetting motion from the fired position to the ready position, wherein the trigger is uncoupled from the plunger rod during the resetting motion, an anti-retrograde mechanism associated with the actuation mechanism for preventing rearward movement thereof against the direction of operation of the actuation mechanism through at least a portion of the dosing and resetting motions; and a lockout mechanism comprising an flexible arm engageable with the trigger to prevent movement of the trigger relative to the after a final dose has been administered. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification