Injection device
First Claim
1. An injection device comprising:
- a housing having a trigger projecting though the housing;
a hypodermic syringe, including a syringe body terminating at one end in a hypodermic needle, said hypodermic syringe received within the housing, the syringe having a bore terminating at a forward end in a discharge nozzle and at a rearward end in a flared opening in which a discharge piston having a bore at a rearward end portion thereof is inserted;
a drive element having a forward end consisting of a substantially flat edge region that is adapted to bear upon the rearward end of the discharge piston of the syringe and surrounds a projecting middle region which continuously tapers from the substantially flat edge region to a closed end neb and that is adapted to be received in the bore at the rearward end portion of the discharge piston; and
an actuator a drive spring actuatable by the trigger for advancing the syringe from a refracted position in which the discharge nozzle is contained within the housing to an extended position in which the discharge nozzle extends from an aperture in the housing and for advancing the drive element so as to advance the discharge piston and discharge the contents of the syringe through the discharge nozzle.
2 Assignments
0 Petitions
Accused Products
Abstract
A syringe is received within a housing, the syringe having a bore terminating at a forward end in a hypodermic needle and at a rearward end in a flared opening in which a bung having a bore surrounded by a skirt is insertod. A drive element has a forward end consisting of a substantially flat annular region that bears upon the skirt of the bung and surrounds a conical middle region that is received in the bore of the bung. An actuator advances the drive element so as to advance the bung and discharge the contents through the needle. The opening in the rear of the synnge is flared by being provided with a radius. The combination of the radius at the opening and the projecting conical middle region of the drive element allows misalignments of the two to be managed during automated assembly.
296 Citations
24 Claims
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1. An injection device comprising:
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a housing having a trigger projecting though the housing; a hypodermic syringe, including a syringe body terminating at one end in a hypodermic needle, said hypodermic syringe received within the housing, the syringe having a bore terminating at a forward end in a discharge nozzle and at a rearward end in a flared opening in which a discharge piston having a bore at a rearward end portion thereof is inserted; a drive element having a forward end consisting of a substantially flat edge region that is adapted to bear upon the rearward end of the discharge piston of the syringe and surrounds a projecting middle region which continuously tapers from the substantially flat edge region to a closed end neb and that is adapted to be received in the bore at the rearward end portion of the discharge piston; and an actuator a drive spring actuatable by the trigger for advancing the syringe from a refracted position in which the discharge nozzle is contained within the housing to an extended position in which the discharge nozzle extends from an aperture in the housing and for advancing the drive element so as to advance the discharge piston and discharge the contents of the syringe through the discharge nozzle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An injection device comprising:
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a housing having a trigger projecting through the housing, said housing adapted to receive a hypodermic syringe, including a syringe body terminating at one end in a hypodermic needle, said hypodermic syringe having a bore terminating at a forward end in a discharge nozzle and at a rearward end in a flared opening in which a discharge piston having a bore at a rearward end portion thereof is inserted; and a drive element that is adapted to bear upon the rearward end of the discharge piston of the syringe; and an actuator a drive spring actuatable by the trigger for advancing the syringe from a refracted position in which the discharge nozzle is contained within the housing to an extended position in which the discharge nozzle extends from an aperture in the housing for advancing the drive element so as to advance the discharge piston and discharge the contents of the syringe through the discharge nozzle, the forward end of the drive element consisting of a substantially flat edge region surrounding a projecting middle region which continuously tapers from the substantially flat edge region to a closed end neb and that is adapted to be received in the bore at the rearward end portion of the discharge piston. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification