DRUG DELIVERY DEVICE WITH AN IMPROVED PISTON ROD
First Claim
1. A piston rod for a device, especially a pen-type injector, comprising an elongated member having a distal end and a proximal end, where the proximal end has at least one guidepost extending outwardly from the elongated member and is configured to engage a corresponding groove in a drive member and for transmitting axial or rotational forces from the drive member.
1 Assignment
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Accused Products
Abstract
An improved drug delivery device is provided having a piston rod that incorporates on its proximal end at least one guidepost that is configured for transmitting axial and rotational forces from a drive mechanism. The device comprises a drug delivery device housing and a medicament contained in the drug delivery device housing.
2 Citations
10 Claims
- 1. A piston rod for a device, especially a pen-type injector, comprising an elongated member having a distal end and a proximal end, where the proximal end has at least one guidepost extending outwardly from the elongated member and is configured to engage a corresponding groove in a drive member and for transmitting axial or rotational forces from the drive member.
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2. A piston rod for a device, especially a pen-type injector, comprising an elongated member having a distal end and a proximal end, where the proximal end has at least one set of guideposts having at least two guideposts, where each guidepost extends outwardly from the elongated member and is configured to engage a corresponding groove in a drive member and for transmitting axial or rotational forces from the drive member.
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3. A piston rod for a device, especially a pen-type injector, comprising an elongated member having a distal end and a proximal end where the proximal end has at least two sets of guideposts, where at least one set has at least two guideposts that are in axial alignment with each other and are configured for transmitting axial and rotational forces from a drive member having at least one internal groove with a pitch P.
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4. A piston rod for a pen device, especially a pen-type injector, comprising an elongated member having a distal end and a proximal end where the proximal end has at least two sets of two or more guideposts, where the guideposts are in axial alignment with each other and are configured for transmitting axial and rotational forces from a drive member having at least one internal groove with a pitch P.
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9. A drug delivery device, said device comprising:
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a drug delivery device housing; a retaining means for a medicament contained in said drug delivery device housing; a drive mechanism; and a piston rod in communication with at least one groove in the drive mechanism comprising an elongated member having a distal end and a proximal end, where the proximal end has at least one guidepost extending outwardly from the elongated member and is configured to engage a corresponding groove in a drive member and for transmitting axial or rotational forces from the drive member.
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10. A pen type drug delivery device, said device comprising:
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a drug delivery device housing, said housing having a distal end for mounting a needle assembly and a proximal end comprising a dose dial grip; a cartridge contained in said housing, said cartridge containing a medication; a drive mechanism; and a piston rod in communication with at least one groove in the drive mechanism comprising an elongated member having a distal end and a proximal end, where the proximal end has at least one guidepost extending outwardly from the elongated member and is configured to engage a corresponding groove in a drive member and for transmitting axial or rotational forces from the drive member.
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Specification