Patent ID: 7108675

Claim:
An injection device comprising: a housing, a nozzle assembly removably associated with the housing and defining a fluid chamber, a plunger; a trigger assembly, an energy generating source operatively associated with the trigger assembly so that movement of the trigger assembly activates the energy source to move the plunger in a first direction and expel a fluid from the fluid chamber, and a fixed injection-assisting probe at a distal end of the injection device, said injection-assisting probe comprising: a body fixed to a distal end of the nozzle assembly; and a discharge channel extending through the probe body, in fluid communication at a first end with the fluid chamber, and terminating at a second end in an orifice through which the fluid is expelled; wherein the energy source and discharge channel are configured to expel the fluid through the orifice to jet inject the fluid, and the discharge channel has a channel portion at the second end with a ratio of length to average diameter greater than 6/1.