Method for Assembling a Drug Delivery Device, Assembly for a Drug Delivery Device and Piston Rod for a Drug Delivery Device
First Claim
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1. A method for assembling a drug delivery device comprising a body retaining a piston rod and a cartridge retaining a bung and holding a drug, said body having a distal end and a proximal end,comprising the following steps:
- A) Providing the cartridge and the body retaining the piston rod, wherein the piston rod is plastically deformable, at least a part of said plastically deformable piston rod being manufactured from a plastically deformable material,B) Applying a force on the piston rod, at least a part of the piston rod being in a state that allows plastic deformation, so that the piston rod is plastically deformed and an element of the piston rod abuts the bung,C) Applying conditions in order to bring the plastically deformed piston rod of step B) into an altered state wherein no further plastic deformation takes placeD) Securing the cartridge to the body.
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Abstract
A method for assembling a drug delivery device comprising a body (2) retaining a piston rod (3) and a cartridge (5) retaining a bung (6) and holding a drug, said body (2) having a distal end (11) and a proximal end (12),
comprises the following steps:
- A) Providing the cartridge (5) and the body (2) retaining the piston rod (3), wherein the piston rod (3) is plastically deformable, at least a part of said plastically deformable piston rod being manufactured from a plastically deformable material,
- B) Applying a force on the piston rod (3), at least a part of the piston rod (3) being in a state that allows plastic deformation, so that the piston rod (3) is plastically deformed and an element of the piston rod (3) abuts the bung (6),
- C) Applying conditions in order to bring the plastically deformed piston rod (3) of step B) into an altered state wherein no further plastic deformation takes place,
- D) Securing the cartridge (5) to the body (2).
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Citations
16 Claims
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1. A method for assembling a drug delivery device comprising a body retaining a piston rod and a cartridge retaining a bung and holding a drug, said body having a distal end and a proximal end,
comprising the following steps: -
A) Providing the cartridge and the body retaining the piston rod, wherein the piston rod is plastically deformable, at least a part of said plastically deformable piston rod being manufactured from a plastically deformable material, B) Applying a force on the piston rod, at least a part of the piston rod being in a state that allows plastic deformation, so that the piston rod is plastically deformed and an element of the piston rod abuts the bung, C) Applying conditions in order to bring the plastically deformed piston rod of step B) into an altered state wherein no further plastic deformation takes place D) Securing the cartridge to the body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 11, 14)
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9. A method for assembling a drug delivery device comprising a body retaining a piston rod and a cartridge retaining a bung and holding a drug, said body having a distal end and a proximal end,
comprising the following steps: -
A′
) Providing a component defining the distance between the proximal face of the bung and the proximal end of the piston rod,B′
) Engaging the cartridge and the distance defining component,C′
) Arranging the cartridge in its most distal position with respect to the distance defining component and determining a distance between the proximal face of the bung and the proximal end of the distance defining component,D′
) Calculating the gap between the proximal face of the bung and the distal end of the piston rod from the distance determined in step C′
),E′
) Adjusting the length of the piston rod,F′
) Securing the cartridge to the body. - View Dependent Claims (10)
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12. A piston rod contained in an assembly for a drug delivery device having a distal end and a proximal end which are spaced apart in the direction of an axis, said piston rod comprising a predetermined area of weakness, which is deformable upon application of a force in the direction of the axis with respect to the piston rod.
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13. An assembly for a drug delivery device having a distal end and a proximal end, comprising
a body retaining a piston rod, a cartridge retaining a bung, wherein the cartridge is secured to the body and wherein the piston rod abuts the proximal face of the bung, the piston rod comprising a plastically deformed area, at least a part of said plastically deformed piston rod being obtained from a plastically deformable material.
Specification