CARTRIDGE INTERFACE ASSEMBLY WITH DRIVING PLUNGER
First Claim
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1. A combination cartridge and cartridge interface assembly comprising:
- a rotationally immobile cartridge having an inner cylindrical surface, a first stopper slidingly inserted in the cartridge, a distal end and a substance therein for administration to a subject;
a driving plunger comprising an outer shaft; and
a driver comprising an inner shaft, said inner shaft mating with said outer shaft, so that said shafts are movable telescopically with respect to one another, wherein rotation of said driver causes said driving plunger to linearly advance in a direction away from said driver, the arrangement being such that on insertion of the cartridge interface assembly in the rotationally immobile cartridge, the driving plunger is in complementary sealing anti-rotation friction relation with the inner cylindrical surface such that rotation of said driver causes said driving plunger to linearly advance only towards the distal end until the driving plunger abuts against the stopper whereupon the driving lunger urges the stopper towards the distal end for metering substance from the cartridge.
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Abstract
A cartridge interface assembly including a driving plunger including an outer shaft, and a driver including an inner shaft, the inner shaft mating with an intermediate shaft, the intermediate shaft mating with the outer shaft, so that the shafts are movable telescopically with respect to one another, wherein rotation of the driver causes the driving plunger to advance in a direction away from the driver.
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Citations
8 Claims
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1. A combination cartridge and cartridge interface assembly comprising:
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a rotationally immobile cartridge having an inner cylindrical surface, a first stopper slidingly inserted in the cartridge, a distal end and a substance therein for administration to a subject; a driving plunger comprising an outer shaft; and a driver comprising an inner shaft, said inner shaft mating with said outer shaft, so that said shafts are movable telescopically with respect to one another, wherein rotation of said driver causes said driving plunger to linearly advance in a direction away from said driver, the arrangement being such that on insertion of the cartridge interface assembly in the rotationally immobile cartridge, the driving plunger is in complementary sealing anti-rotation friction relation with the inner cylindrical surface such that rotation of said driver causes said driving plunger to linearly advance only towards the distal end until the driving plunger abuts against the stopper whereupon the driving lunger urges the stopper towards the distal end for metering substance from the cartridge. - View Dependent Claims (8)
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7. A method for interfacing between a driver and plunger slidingly disposed in a rotationally immobile cartridge, the method comprising:
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providing a a rotationally immobile cartridge having an inner cylindrical surface, a first stopper slidingly inserted in the cartridge, a distal end and a substance therein for administration to a subject inserting a cartridge interface assembly in the rotationally immobile cartridge, said cartridge interface assembly comprising a driving plunger comprising an outer shaft, and a driver comprising an inner shaft, said inner shaft mating with said outer shaft, so that said shafts are moveable telescopically with respect to one another; and rotating said driver to cause said driving plunger to linearly advance distally in said cartridge until abutting said plunger, the arrangement being such that on insertion of the cartridge interface assembly in the rotationally immobile cartridge, the driving plunger is in complementary sealing anti-rotation friction relation with the inner cylindrical surface such that rotation of said driver causes said driving plunger to linearly advance only towards the distal end until the driving plunger abuts against the stopper whereupon the driving plunger urges the stopper towards the distal end for metering substance from the cartridge.
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Specification