US 12,239,829 B2
Multi-dose dispenser
Mathieu Viens, Granby (CA); and Robert Liddell, Granby (CA)
Assigned to DUOJECT MEDICAL SYSTEMS INC., Bromont (CA)
Appl. No. 17/300,646
Filed by DUOJECT MEDICAL SYSTEMS INC., Bromont (CA)
PCT Filed Mar. 10, 2020, PCT No. PCT/CA2020/000023
§ 371(c)(1), (2) Date Sep. 10, 2021,
PCT Pub. No. WO2020/181357, PCT Pub. Date Sep. 17, 2020.
Prior Publication US 2022/0323687 A1, Oct. 13, 2022
Int. Cl. A61M 5/315 (2006.01)
CPC A61M 5/31593 (2013.01) [A61M 5/31526 (2013.01); A61M 2005/31508 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A multi-dose dispenser comprising:
an inner housing (16) and an outer housing (12), said inner housing (16) being movable within said outer housing (12) for a defined distance;
a plunger rod (20) comprising a shaft (66) mounted within said inner housing (16), said shaft (66) having a plurality of spaced apart teeth (68) circling said shaft (66) formed on said shaft (6);
an actuator (22) located at one end of said shaft (66) for advancing the inner housing (16) said defined distance between an original position and an advanced position;
said inner housing (16) having at least one pawl (70) arranged to engage with said teeth (68);
a syringe (74) co-axially mounted interiorly of said inner housing (16), said syringe (74) being arranged such that said shaft (66) engages with a plunger within said syringe (74); and
a spring member (18), said spring member (18) being biased between said inner housing (16) and said outer housing (12);
wherein the outer housing (12) has a shoulder (36) and the actuator (22) has a button bottom wall (62);
and wherein when the actuator (22) is engaged, the inner housing (16) and the shaft (66) are advanced together from the original position to the advanced position through engagement of the button bottom wall (62) with the shoulder (36);
and wherein the inner housing (16) and the shaft (66) are returned to the original position from the advanced position by force of the spring member (18) when the actuator (22) is released.