Injection device plunger auto-disable
AssigneeBioject, Inc.
InventorsSergio Landau, Daniel E. Williamson, John R. Marshall
Life of this patent
Estimating the term…
Abstract
A nozzle assembly for a needle-free injection device. The nozzle assembly includes a nozzle body including an injectate chamber and one or more outlet orifices and a plunger configured to move through the injectate chamber toward the one or more outlet orifices. In some embodiments, the plunger includes a first portion and a second portion removably joined by a frangible region. In some embodiments, the plunger includes extensions configured to couple the plunger to a drive assembly of a needle-free injection device.
Claims19
A nozzle assembly for a needle-free injection device comprising:
- a nozzle body including an injectate chamber and an outlet orifice;
- and
- a plunger configured to move through the injectate chamber toward the outlet orifice, the plunger including a proximal portion, a distal portion and frangible region along which the proximal portion and distal portion are configured to uncouple upon injection;
- wherein a region of the proximal portion adjacent the frangible region is adapted to rotate away from a region of the distal portion adjacent the frangible region upon injection;
- wherein the proximal portion remains in the injectate chamber upon retraction of the distal portion from the injectate chamber.
A plunger for use in a needle-free injection device comprising:
- a plunger configured to move through an injectate chamber of the needle-free device toward an outlet orifice, the plunger including a proximal portion, a distal portion and frangible region along which the proximal portion and distal portion are configured to uncouple upon injection;
- wherein a region of the proximal portion adjacent the frangible region is adapted to rotate away from a region of the distal portion adjacent the frangible region upon injection;
- wherein the proximal portion remains in the injectate chamber upon retraction of the distal portion from the injectate chamber.
A nozzle assembly for an injection device comprising:
- a nozzle body including an injectate chamber and an outlet orifice;
- and
- a plunger configured to move through the injectate chamber toward the outlet orifice, the plunger including a proximal portion, a distal portion, a frangible region along which the proximal portion and distal portion are configured to uncouple upon injection, a first surface proximal to the frangible region that is at an angle relative to a longitudinal axis of the injection device, and a second surface distal to the frangible region that is at an angle relative to the longitudinal axis of the injection device;
- wherein the first surface guides a region of the distal portion adjacent the frangible region away from a region of the proximal portion adjacent the frangible region during injection;
- wherein the second surface guides a region of the proximal portion adjacent the frangible region away from a region of the proximal portion adjacent the frangible region during injection;
- wherein the proximal portion remains in the injectate chamber upon retraction of the distal portion from the injectate chamber.
Dependencies are inferred from the claim text.