Injection device
First Claim
1. An injection device comprising:
- a housing adapted to receive a syringe having a relatively wide reservoir portion and a relatively narrow discharge nozzle, so that the syringe is movable between a retracted position in which the discharge nozzle is contained within the housing and an extended position in which the discharge nozzle extends from the housing through an exit aperture;
a drive element that acts upon the syringe;
a drive that acts upon the drive element to advance the syringe from its retracted position to its extended position and discharge its contents through the discharge nozzle;
a syringe carrier movable within the housing for carrying the syringe as it is advanced and restraining its advancement beyond its extended position,wherein the syringe carrier is adapted to support the syringe between the reservoir portion and the discharge nozzle,wherein the syringe carrier comprises an annular portion which is adapted to act as part of a release mechanism and couple with the drive element in order to disconnect the drive element from the drive.
2 Assignments
0 Petitions
Accused Products
Abstract
An injection device 110 is described having a housing 112 that receives a syringe 114 having a needle 118, wherein the syringe is supported in a syringe carrier 150. The syringe 114 and syringe carrier 150 are biased by a return spring 126 from an extended position in which the needle 118 extends from the housing 112 through an exit aperture 128 to a retracted position in which it does not. A drive spring 130 acts via a drive to advance the syringe 114 from its retracted position to its extended position and discharge its contents through the needle 118 and a return spring 126, brought into play when the drive has reached a nominal return position, restores the syringe 114 to its retracted position. The injection device is less prone to failure than prior art devices and is safer should failure occur.
-
Citations
11 Claims
-
1. An injection device comprising:
-
a housing adapted to receive a syringe having a relatively wide reservoir portion and a relatively narrow discharge nozzle, so that the syringe is movable between a retracted position in which the discharge nozzle is contained within the housing and an extended position in which the discharge nozzle extends from the housing through an exit aperture; a drive element that acts upon the syringe; a drive that acts upon the drive element to advance the syringe from its retracted position to its extended position and discharge its contents through the discharge nozzle; a syringe carrier movable within the housing for carrying the syringe as it is advanced and restraining its advancement beyond its extended position, wherein the syringe carrier is adapted to support the syringe between the reservoir portion and the discharge nozzle, wherein the syringe carrier comprises an annular portion which is adapted to act as part of a release mechanism and couple with the drive element in order to disconnect the drive element from the drive. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
Specification