Multiple dosage injector
First Claim
1. A medicament dispensing mechanism, comprising:
- a housing having a longitudinal axis;
a plunger rod configured for ejecting the doses of medicament from a chamber;
an actuation mechanism that comprises a driver and a trigger, the trigger having a ready position and a fired position with respect to the housing,wherein;
the trigger is configured for manipulation by a user for successive movement in a dosing motion along the longitudinal axis from the ready position to the fired position to cause the plunger rod to eject one of the doses of a predetermined volume, and in a resetting motion from the fired position to the ready position;
in the dosing motion, the trigger causes the driver and the plunger rod to rotate about the longitudinal axis;
the housing defines a first track and the trigger defines a first projection, the first track being configured for receiving the first projection and defines the dosing motion and the resetting motion with respect to the housing;
the trigger defines a second track and the driver defines a second projection, the second track being configured for receiving the second projection and applying a force to the second projection during the dosing motion to rotate the driver, and to allow the resetting motion without rotating the driver;
the first track defines a succession of a plurality of the ready positions interposed in continuous series by a plurality of the fired positions and paths for the corresponding dosing motions and resetting motions therebetween,the second track comprises a plurality of driving portions for causing the trigger to rotate the driver in each of the dosing motions connected in continuous series by alternately applying a force to the second projection during successive dosing motions of the trigger to rotate the driver in a driving direction;
the first track has a first tab disposed therein with a free end configured for engaging the first projection and preventing rearward movement of the trigger from the fired position against the direction of the dosing motion; and
the first track has a second tab disposed therein with a free end configured for engaging the first projection and for preventing rearward movement of the trigger from the ready position against the direction of the resetting motion.
1 Assignment
0 Petitions
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.
434 Citations
11 Claims
-
1. A medicament dispensing mechanism, comprising:
-
a housing having a longitudinal axis; a plunger rod configured for ejecting the doses of medicament from a chamber; an actuation mechanism that comprises a driver and a trigger, the trigger having a ready position and a fired position with respect to the housing, wherein; the trigger is configured for manipulation by a user for successive movement in a dosing motion along the longitudinal axis from the ready position to the fired position to cause the plunger rod to eject one of the doses of a predetermined volume, and in a resetting motion from the fired position to the ready position; in the dosing motion, the trigger causes the driver and the plunger rod to rotate about the longitudinal axis; the housing defines a first track and the trigger defines a first projection, the first track being configured for receiving the first projection and defines the dosing motion and the resetting motion with respect to the housing; the trigger defines a second track and the driver defines a second projection, the second track being configured for receiving the second projection and applying a force to the second projection during the dosing motion to rotate the driver, and to allow the resetting motion without rotating the driver; the first track defines a succession of a plurality of the ready positions interposed in continuous series by a plurality of the fired positions and paths for the corresponding dosing motions and resetting motions therebetween, the second track comprises a plurality of driving portions for causing the trigger to rotate the driver in each of the dosing motions connected in continuous series by alternately applying a force to the second projection during successive dosing motions of the trigger to rotate the driver in a driving direction; the first track has a first tab disposed therein with a free end configured for engaging the first projection and preventing rearward movement of the trigger from the fired position against the direction of the dosing motion; and the first track has a second tab disposed therein with a free end configured for engaging the first projection and for preventing rearward movement of the trigger from the ready position against the direction of the resetting motion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A medicament dispensing mechanism, comprising:
-
a housing having a longitudinal axis; a plunger rod configured for ejecting doses of medicament from a chamber, each of the doses having a predetermined volume; an actuation mechanism that comprises a driver and a trigger, the trigger having a ready position and a fired position with respect to the housing, wherein; the trigger is configured to be manipulated by a user for successive movement in a dosing motion along the longitudinal axis from the ready position to the fired position to cause the plunger rod to eject one of the doses, and movement in a resetting motion from the fired position to the ready position; in the dosing motion, the trigger causes the driver and the plunger rod to rotate about the longitudinal axis; the housing defines a first track and the trigger defines a first projection, the first track configured to receive the first projection and defines the dosing motion and the resetting motion with respect to the housing; the first track includes a first horizontal portion, a second horizontal portion axially spaced from the first horizontal portion, and a vertical portion connecting the first horizontal portion and the second horizontal portion such that the resetting motion includes a first rotation of the trigger about the longitudinal axis, axial translation of the trigger, and a second rotation of the trigger about the longitudinal axis, the first horizontal portion including an upper boundary and a lower boundary, each of the upper boundary and the lower boundary extending horizontally beyond the vertical portion; the trigger defines a second track and the driver defines a second projection, the second track being configured to receive the second projection and applying a force to the second projection during the dosing motion to rotate the driver, and to allow the resetting motion without rotating the driver; the first track defines a succession of a plurality of the ready positions interposed in continuous series by a plurality of the fired positions and paths for the corresponding dosing motions and resetting motions therebetween; the second track comprises a plurality of driving portions for causing the trigger to rotate the driver in each of the dosing motions connected in continuous series by alternately applying a force to the second projection during successive dosing motions of the trigger to rotate the driver in a driving direction.
-
-
11. A medicament dispensing mechanism, comprising:
-
a housing having a longitudinal axis and a first track including a plurality dosing paths and a plurality of resetting paths, each of the plurality of dosing paths alternatingly arranged with each of the plurality of resetting paths in continuous alternating series, the first track including a first tab and a second tab each having a free end; a chamber storing a plurality of doses of medicament; an actuation mechanism comprising a driver and a trigger operatively coupled to the housing, the trigger moveable with respect to the housing between a ready position and a fired position, the trigger including a first projection moveable within the first track of the housing such that the trigger moves between the ready position and the fired position along the longitudinal axis in a dosing motion as the first projection moves along one of the plurality of dosing paths and the trigger moves between the fired position and the ready position in a resetting motion as the first projection moves along one of the plurality of resetting paths; a plunger rod operatively coupled to the trigger and configured to rotate about the longitudinal axis to eject one of the plurality of doses of medicament from the chamber as the trigger moves in the dosing motion, each of the plurality of doses of medicament having a predetermined volume; wherein the trigger includes a second track and the driver includes a second projection operatively coupled to the second track, the second track including a plurality of driving portions configured to apply a force to the second projection thereby rotating the driver in a driving direction as the trigger moves in the dosing motion, the second track configured to allow the resetting motion of the trigger without rotating the driver; wherein the free end of the first tab in the first track is configured to engage the first projection of the trigger thereby preventing rearward movement of the first projection along one of the plurality of dosing paths; wherein the free end of the second tab in the first track is configured to engage the first projection of the trigger thereby preventing rearward movement of the first projection along one of the plurality of resetting paths.
-
Specification