System and method for multiple site dispensing or injection

A system for injection, comprising:

• a disposable portion, comprising
• a syringe body having proximal and distal ends, a syringe interior, and a disposable portion flange at the proximal end thereof,
• an injectable fluid disposed in the syringe interior,
• a stopper member disposed in the syringe interior, and
• a plunger member coupled to the stopper member, wherein the plunger member defines a rack gear comprising a plurality of rack gear teeth;
• and
• a reusable portion configured to be removably coupled to the disposable portion, the reusable portion comprising
• a gear assembly comprising a pinion gear configured to sequentially advance the plunger member distally by a predetermined distance, and
• a finger flange coupled to the disposable portion flange,
• wherein the gear assembly comprises
• a sprocket, and
• a reduction gear operatively coupling the sprocket to the pinion gear,
• wherein the reusable member comprises a thumbpad member,
• wherein the thumbpad member defines a pawl at a distal end thereof, and
• wherein the pawl is operatively coupled to the sprocket of the gear assembly.