Pneumatically operable injection device
First Claim
1. A pneumatically operable injection device, characterized by a first pressure cylinder comprising a piston which is adapted to be rigidly but detachably connected to a piston of an injection syringe, a second pressure cylinder comprising a piston having an extension adapted to co-operate with a three-way cock in such a manner as to cause said three-way cock to be operated by movement of said piston, a flow connection between the outlet of said injection syringe and said three-way cock, a flow connection between said three-way cock and a connecting piece, a flow connection leading to an inlet of a reservoir for the substance to be injected, the device being adapted to effect either a connection between the outlet of the injection syringe and said connecting piece or between the syringe outlet and the connection of said reservoir, compressed-air lines provided for the purpose of pneumatically operating said pistons in said two pressure cylinders and bleed valves disposed in said compressed-air lines and adapted to be controlled electronically in such a manner that the pneumatically effected filling step can only be initiated with said three-way cock being in the position in which it connects the syringe outlet with the reservoir and that a subsequent injection step can only be effected with said three-way cock in a position in which it connects the syringe outlet with said connecting piece.
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Accused Products
Abstract
A pneumatically operable injection device has a first pressure cylinder with a piston which is adapted to be rigidly but detachably connected to a piston of an injection syringe, and a second pressure cylinder with a piston having an extension adapted to co-operate with a three-way cock in such a manner as to cause the three-way cock to be operated by movement of its piston. Flow connections are provided between the outlet of the injection syringe and the three-way cock, between the three-way cock and a connecting piece, and between the three-way cock and an inlet of a reservoir for the substance to be injected. The device is adapted to effect either a connection between the outlet of the injection syringe and the connecting piece or between the syringe outlet and the reservoir. Compressed-air lines are provided for the purpose of pneumatically operating the pistons in the two pressure cylinders. Bleed valves disposed in the compressed-air lines are adapted to be controlled electronically in such a manner that the pneumatically effected filling step can only be initiated with the three-way cock being in the position in which it connects the syringe outlet with the reservoir and that a subsequent injection step can only be effected with the three-way cock in a position in which it connects the syringe outlet with the connecting piece.
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Citations
7 Claims
- 1. A pneumatically operable injection device, characterized by a first pressure cylinder comprising a piston which is adapted to be rigidly but detachably connected to a piston of an injection syringe, a second pressure cylinder comprising a piston having an extension adapted to co-operate with a three-way cock in such a manner as to cause said three-way cock to be operated by movement of said piston, a flow connection between the outlet of said injection syringe and said three-way cock, a flow connection between said three-way cock and a connecting piece, a flow connection leading to an inlet of a reservoir for the substance to be injected, the device being adapted to effect either a connection between the outlet of the injection syringe and said connecting piece or between the syringe outlet and the connection of said reservoir, compressed-air lines provided for the purpose of pneumatically operating said pistons in said two pressure cylinders and bleed valves disposed in said compressed-air lines and adapted to be controlled electronically in such a manner that the pneumatically effected filling step can only be initiated with said three-way cock being in the position in which it connects the syringe outlet with the reservoir and that a subsequent injection step can only be effected with said three-way cock in a position in which it connects the syringe outlet with said connecting piece.
Specification