CARTRIDGE INTERFACE ASSEMBLY WITH DRIVING PLUNGER

• US 20110178463A1
• Filed: 01/19/2010
• Published: 07/21/2011
• Est. Priority Date: 01/19/2010
• Status: Active Grant

• Current Assignee: West Pharma. Services IL, Ltd. (West Pharmaceutical Services Incorporated)
• Original Assignee: Medimop Medical Projects Ltd. (West Pharmaceutical Services Incorporated)
• Inventors: Cabiri, Oz
• Granted Patent: US 7,967,795 B1
• Time in Patent Office: Days
• US Class Current: 604/154
• CPC Class Codes: A61M 2005/14506 mechanically driven, e.g. spring or clockwork
• CPC Class Codes: A61M 5/1452 pressurised by means of pistons
• CPC Class Codes: A61M 5/1456 with a replaceable reservoir comprising a piston rod to be moved into the reservoir, e.g. the piston rod is part of the removable reservoir
• CPC Class Codes: A61M 5/14566 with a replaceable reservoir for receiving a piston rod of the pump
• CPC Class Codes: A61M 5/2425 by compression of deformable ampoule or carpule wall

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.

Claims

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.

8. The combination as recited in claim 1, wherein said complementary sealing anti-rotation friction relation is the only force impeding rotation of the driving plunger with respect to the cartridge.

7. A method for interfacing between a driver and plunger slidingly disposed in a rotationally immobile cartridge, the method comprising:

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.