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

Claim 7:
8. An injection device for injecting, said injection device comprising:
a housing having a plurality of parallel ribs formed on an interiorly facing wall of said housing, 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 cylindrical body 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
said plunger rod having a recessed arcuate surface at a distal end thereof, said at least one protrusion extending radially outwardly from said cylindrical body contacting said recessed arcuate surface to cause rotation of said cylindrical body such that said at least one protrusion extending radially outward from said cylindrical body lines up with said channel allowing said spring to move said cylindrical body and said needle hub upwardly within said housing in response to said plunger rod being depressed;
wherein said at least one protrusion of said cylindrical body contacts said diagonal rib while said cylindrical body and said needle hub are driven upwardly within said housing by said spring, causing said at least one protrusion of said cylindrical body 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.