DRIVE MECHANISM FOR A DRUG DELIVERY DEVICE
First Claim
1. Drive mechanism for a drug delivery device for dispensing of a dose of a medicinal product, comprising:
- a holder for a product-containing cartridge, the cartridge having a piston slidably arranged therein in an axial direction,a piston rod to be operably engaged with the cartridge'"'"'s piston for dispensing of a dose of the medicinal product,at least one adjusting member displaceably arranged in axial direction relative to the piston and/or relative to the piston rod for eliminating axial clearance between the piston and the piston rod, wherein the adjusting member is attached to a proximal end of the piston or is pre-assembled to a distal portion of the piston rod and further comprises a receptacle to receive a distal portion of the piston rod,an interlock means adapted to interact with the adjusting member for locking the piston rod'"'"'s distal portion in place at an arbitrary position inside the adjusting member'"'"'s receptacle.
0 Assignments
0 Petitions
Accused Products
Abstract
The present invention relates to a drive mechanism for a drug delivery device as well as to a drug delivery device for dispensing of a dose of a medicinal product, wherein the drive mechanism comprises:
a holder for a product-containing cartridge, the cartridge having a piston slidably arranged therein in an axial direction,
a piston rod to be operably engaged with the cartridge'"'"'s piston for dispensing of a dose of the medicinal product,
at least one adjusting member slidably arranged in axial direction relative to the piston and/or relative to the piston rod for eliminating axial clearance between the piston and the piston rod,
an interlock means adapted to interact with the adjusting member for mutually locking in position the piston and the piston rod irrespective of the relative distance between piston and piston rod.
20 Citations
19 Claims
-
1. Drive mechanism for a drug delivery device for dispensing of a dose of a medicinal product, comprising:
-
a holder for a product-containing cartridge, the cartridge having a piston slidably arranged therein in an axial direction, a piston rod to be operably engaged with the cartridge'"'"'s piston for dispensing of a dose of the medicinal product, at least one adjusting member displaceably arranged in axial direction relative to the piston and/or relative to the piston rod for eliminating axial clearance between the piston and the piston rod, wherein the adjusting member is attached to a proximal end of the piston or is pre-assembled to a distal portion of the piston rod and further comprises a receptacle to receive a distal portion of the piston rod, an interlock means adapted to interact with the adjusting member for locking the piston rod'"'"'s distal portion in place at an arbitrary position inside the adjusting member'"'"'s receptacle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
-
-
19. A method of eliminating clearance between a piston and a piston rod in a drive mechanism of a drug delivery device, wherein the drive mechanism comprises a holder for a product-containing cartridge having a piston slidably arranged therein in an axial direction, wherein the piston rod is to be operably engaged with the cartridge'"'"'s piston for dispensing of a dose of the medicinal product, further comprising an adjusting member attached to a proximal end of the piston or being pre-assembled to a distal portion of the piston rod, wherein the adjusting member comprises a receptacle to receive a distal portion of the piston rod, the method of eliminating said clearance during or after assembly of the drive mechanism comprises the steps of:
-
axially moving of the piston rod relative to the adjusting member and/or axially moving the adjusting member relative to the piston for eliminating axial clearance between the piston and the piston rod, locking the piston rod'"'"'s distal portion in place at an arbitrary position inside the adjusting member'"'"'s receptacle by an interlock means adapted to interact with the adjusting member.
-
Specification