Multiple dosage injector with rack and pinion dosage system
First Claim
Patent Images
1. A dispensing mechanism, comprising:
- a housing having a proximal-distal axis;
a ram within the housing, movable in a distal direction;
a user-operable push button moveable along the proximal-distal axis relative to the housing, the push button including a push button slot at a distal portion of the push button;
a crank arm having a pawl tooth, a pivot point, and a crank arm engagement member slideably engageable with the push button slot such that movement of the push button causes the crank arm engagement member to move along the push button slot, causing rotation of the crank arm about the pivot point;
a ratchet gear having a first set of teeth releasably engageable with the pawl tooth and a second set of teeth releaseably engageable with the ram, wherein engagement of the pawl tooth with the first set of teeth of the ratchet gear causes the ratchet gear to rotate, causing the ram to distally advance relative to the housing; and
an anti-reverse mechanism including;
at least one housing ratchet integrally formed on an internal surface of the housing; and
a flexible column integrally formed on and extending from a distal portion of the push button, the flexible column having a flexible column protrusion at a proximal end thereof,wherein as the push button moves along the proximal-distal axis, the flexible column protrusion engages the housing ratchet and restricts movement of the push button to one direction during a resetting motion.
1 Assignment
0 Petitions
Accused Products
Abstract
A dispensing mechanism for delivering a dosage of medicament including a housing, a push button, a crank arm that is slideably engageable with the push button, a ram, and a ratchet gear releasably engageable with the crank arm and ram, translation of the push button along an axis causing the crank arm to engage and rotate the ratchet gear which causes the ram to distally advance relative to the housing.
-
Citations
18 Claims
-
1. A dispensing mechanism, comprising:
-
a housing having a proximal-distal axis; a ram within the housing, movable in a distal direction; a user-operable push button moveable along the proximal-distal axis relative to the housing, the push button including a push button slot at a distal portion of the push button; a crank arm having a pawl tooth, a pivot point, and a crank arm engagement member slideably engageable with the push button slot such that movement of the push button causes the crank arm engagement member to move along the push button slot, causing rotation of the crank arm about the pivot point; a ratchet gear having a first set of teeth releasably engageable with the pawl tooth and a second set of teeth releaseably engageable with the ram, wherein engagement of the pawl tooth with the first set of teeth of the ratchet gear causes the ratchet gear to rotate, causing the ram to distally advance relative to the housing; and an anti-reverse mechanism including; at least one housing ratchet integrally formed on an internal surface of the housing; and a flexible column integrally formed on and extending from a distal portion of the push button, the flexible column having a flexible column protrusion at a proximal end thereof, wherein as the push button moves along the proximal-distal axis, the flexible column protrusion engages the housing ratchet and restricts movement of the push button to one direction during a resetting motion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
-
-
16. A dispensing mechanism, comprising:
-
a housing having a proximal-distal axis; a ram within the housing, movable in a distal direction; a user-operable push button moveable along the proximal-distal axis relative to the housing, the push button including a push button slot at a distal portion of the push button; a V-shaped crank arm having a pawl tooth, a pivot point, and a crank arm engagement member slideably engageable with the push button slot such that movement of the push button causes the crank arm engagement member to move along the push button slot, causing rotation of the crank arm about the pivot point; and a ratchet gear having a first set of teeth releasably engageable with the pawl tooth and a second set of teeth releaseably engageable with the ram, wherein engagement of the pawl tooth with the first set of teeth of the ratchet gear causes the ratchet gear to rotate, causing the ram to distally advance relative to the housing, wherein the crank arm is rotatable about a pivot axis extending through the pivot point, the pivot axis being generally perpendicular to the proximal-distal axis, and wherein the ratchet gear is rotatable about the pivot axis. - View Dependent Claims (17, 18)
-
Specification