Medication delivery device with telescopic piston rod
First Claim
1. A medication delivery device for delivering medicine or other fluent material to a mammal body, having a housing (1) accommodating a cartridge (2) containing an amount of said medicine, comprising:
- an elastomeric piston (3) movable mounted in said cartridge (2), which elastomeric piston (3) is moved from a proximal end of said cartridge (2) towards a distal end of said cartridge (2) by rotating at least a part (5) of a first telescopic piston rod (4), which first telescopic piston rod (4) has a distal part (7) abutting said elastomeric piston (3) and a proximal part (5) rotatably mounted in said housing (1) and a plurality of parts (6) there between, said parts (5,6,7) being connected to each other by mating threads, drive means (8,9,10,11 ) for rotating said first telescopic piston rod (4), such that said elastomeric piston (3) moves forward inside said cartridge (2) and expels an amount of said medicine, and means preventing said elastomeric piston (3) from rotating when said part (5) of said first telescopic piston rod (4) is rotated, characterized in that said means preventing said elastomeric piston (3) from rotating when at least a part (5) of said first telescopic piston rod (4) is rotated comprises an additional telescopic piston rod (14) having a proximal end mounted in said housing (1) and a distal end abutting said elastomeric piston (3).
1 Assignment
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Accused Products
Abstract
A medication delivery device comprising a container containing a fluid medicament. The medicament is expelled from the container by moving forward an elastomeric piston inside the cartridge. The piston is moved forward by a telescopic piston rod, which can either be centrally located in the container or eccentric located. One end of the telescopic piston rod abuts the elastomeric piston either by itself or through an additional plate. The abutment having a friction large enough to prevent a lower part of the telescopic rod from rotating. In order to prevent the elastomeric piston from rotating inside the container a second telescopic piston rod is provided parallel with the first telescopic piston rod.
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Citations
10 Claims
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1. A medication delivery device for delivering medicine or other fluent material to a mammal body, having a housing (1) accommodating a cartridge (2) containing an amount of said medicine, comprising:
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an elastomeric piston (3) movable mounted in said cartridge (2), which elastomeric piston (3) is moved from a proximal end of said cartridge (2) towards a distal end of said cartridge (2) by rotating at least a part (5) of a first telescopic piston rod (4), which first telescopic piston rod (4) has a distal part (7) abutting said elastomeric piston (3) and a proximal part (5) rotatably mounted in said housing (1) and a plurality of parts (6) there between, said parts (5,6,7) being connected to each other by mating threads, drive means (8,9,10,11 ) for rotating said first telescopic piston rod (4), such that said elastomeric piston (3) moves forward inside said cartridge (2) and expels an amount of said medicine, and means preventing said elastomeric piston (3) from rotating when said part (5) of said first telescopic piston rod (4) is rotated, characterized in that said means preventing said elastomeric piston (3) from rotating when at least a part (5) of said first telescopic piston rod (4) is rotated comprises an additional telescopic piston rod (14) having a proximal end mounted in said housing (1) and a distal end abutting said elastomeric piston (3). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification