Patent ID: 11872376
Assignee: DUOJECT MEDICAL SYSTEMS INC.
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 0:
1. An injection device for injecting an injectable substance, said injection device comprising:
a housing, said housing having an interiorly facing wall, said wall having a plurality of parallel ribs formed thereon, said ribs defining a channel extending therebetween, wherein the plurality of parallel ribs comprises a first upper rib, a second upper rib, a first lower rib and a second lower rib;
a diagonal rib extending between an end of the second upper rib and an end of the first upper rib;
a horizontal rib extending radially from an upper end of said second lower rib;
a plunger rod mountable within said housing, said plunger rod having at least one protrusion extending outwardly therefrom;
a vial containing said injectable substance, said vial having at least one protrusion extending radially outwardly therefrom;
a needle hub and a hollow needle secured thereto;
a spring mounted at a distal end of said housing, said spring being biased between said distal end of said housing and said needle hub; and
a pusher rod mounted within said plunger rod, said pusher rod being arranged such that depressing said plunger rod with a load will cause said pusher rod to push said injectable substance from said vial into said hollow needle for injection, said plunger rod having a recessed arcuate surface at a distal end thereof, said at least one protrusion extending radially outwardly from said vial contacting said recessed arcuate surface to cause rotation of said vial such that said at least one protrusion extending radially outward from said vial lines up with said channel allowing said spring to move said vial and said needle hub upwardly within said housing;
wherein the at least one protrusion of said vial contacts said diagonal rib while said vial and said needle hub are driven upwardly within said housing by said spring, causing said at least one protrusion of the vial to move into a space between said second upper rib and said wall such that said horizontal rib prevents the plunger rod from being depressed again.