Medication delivery device with bended piston rod
First Claim
1. A portable medication delivery device comprising a medication cartridge having an outlet and a movable piston, and a housing for holding the cartridge, and a flexible piston rod being operable to engage and displace the piston along an axis of the cartridge, and a guiding means for bending the piston rod away from the axis, and an actuating means and driving means for transferring movement from the actuating means to the piston rod, the driving means including a driving wheel for displacing the flexible piston rod, the flexible piston rod comprising regularly spaced first members adapted to mechanically cooperate with corresponding second members on the driving wheel, wherein:
- the flexible piston rod comprises at least two separate tape-shaped bodies that are joined together at one or more points in a traversal cross-section.
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Accused Products
Abstract
The invention relates to: A portable medication delivery device (1) comprising a medication cartridge (11) having an outlet (111) and a movable piston (112), and a housing (12) for holding said cartridge, and a flexible piston rod (13) being operable to engage and displace said piston along an axis (113) of said cartridge, and guiding means (14) for bending said piston rod away from said axis, and actuating means (15), and driving means (16, 17) for transferring movement from said actuating means to said piston rod, said driving means including a driving wheel (17) for displacing the piston rod (13), said flexible piston rod comprising regularly spaced first members (330; 331; 332) adapted to mechanically cooperate with corresponding second members (171) on said driving wheel. The object of the present invention is to provide a medication delivery system that combines compactness with an improved accuracy. The problem is solved in that said flexible piston rod (13) exhibits a linear or approximately linear path between said driving wheel (17) and said piston (112). This has the advantage of yielding a compact, low-weight device with an improved dose accuracy. The invention may e.g. be used in injection or infusion devices for a person'"'"'s self-treatment of a disease such as diabetes.
348 Citations
19 Claims
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1. A portable medication delivery device comprising a medication cartridge having an outlet and a movable piston, and a housing for holding the cartridge, and a flexible piston rod being operable to engage and displace the piston along an axis of the cartridge, and a guiding means for bending the piston rod away from the axis, and an actuating means and driving means for transferring movement from the actuating means to the piston rod, the driving means including a driving wheel for displacing the flexible piston rod, the flexible piston rod comprising regularly spaced first members adapted to mechanically cooperate with corresponding second members on the driving wheel, wherein:
- the flexible piston rod comprises at least two separate tape-shaped bodies that are joined together at one or more points in a traversal cross-section.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
- 17. A flexible piston rod for a medication delivery device comprising two separate tape-shaped bodies joined together at one or more points in a traversal cross section.
Specification