Injection-assisting probe for medical injector assembly
First Claim
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1. 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.
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Abstract
A probe and nozzle assembly for reducing the pressure at which a needleless injector must deliver medicament for proper delivery are disclosed. In one embodiment of the probe, the probe is retractably located within an injector nozzle assembly. Upon activation of the energy source a portion of the probe extends past the nozzle assembly to deliver the medicament through a discharge channel. After activation the probe retracts back into the nozzle assembly. In another embodiment, the probe is fixed to the end of the nozzle assembly. In both embodiments the ratio of discharge channel length to diameter is greater than 6/1.
65 Citations
24 Claims
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1. 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 14)
- a housing, a nozzle assembly removably associated with the housing and defining a fluid chamber, a plunger;
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11. An injection device comprising:
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a housing, a plunger assembly; 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 a nozzle assembly comprising; a fluid chamber for holding fluid; and a nozzle discharge channel in fluid communication with the fluid chamber and including a channel portion that ends at an orifice through which fluid is expelled when the plunger is moved in the first direction; wherein the channel portion has a channel length, and orifice and the channel portion having a same diameter over the channel length, such that the channel portion has a length-to-diameter ratio over the channel length of greater than 6/1, and the energy source and discharge channel are configured to expel the fluid to jet inject the fluid. - View Dependent Claims (12, 13, 22, 23, 24)
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15. A needleless jet injection device comprising:
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a housing, a plunger assembly; a trigger assembly; an energy 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; a fluid chamber for holding fluid; and a nozzle including a nozzle discharge channel in fluid communication with the fluid chamber and comprising a channel portion ending at an orifice through which fluid is expelled when the plunger is moved in the first direction; wherein the channel portion has a length and a diameter, with a ratio of length to average diameter of the channel portion being greater than 6/1 measured adjacent the orifice, such that the energy source has a reduced force generation requirement to expel the fluid to jet inject the fluid. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification