Pen-type injector
First Claim
1. A drug delivery device comprising:
- a housing;
a dose dial sleeve that can be rotated out of the housing to select a dose of a product contained within a cartridge, the dose dial sleeve provided with graphics on an outer surface;
a rotatable piston rod for expelling the selected dose of the productwherein the housing comprises a unitary housing within which the dose dial sleeve and the piston rod are moveably retained anda cylindrical insert rotationally and axially fixed to the housing and threadedly engaged to the piston rod,where the cylindrical insert has a cylindrical portion extending longitudinally in a proximal direction enclosing a portion of the piston rodwherein the unitary housing is configured to completely enclose the cartridge, the dose dial sleeve, the piston rod, and the cylindrical insert.
2 Assignments
0 Petitions
Accused Products
Abstract
A pen-type injector is improved so that a user may select a delivery dose of a medicinal product from a multidose cartridge. The injector includes a housing, the cartridge containing the medicinal product retained within the housing, a piston rod, a dose selecting member to select the dose of the medicinal product to be expelled, and a drive member to expel the selected dose of the medicinal product. The housing is formed unitary so that the dose selecting member and the drive member are moveably retained within the housing. The injector may include a ratchet associated with an insert to ensure the piston rod only rotates in a single direction through the insert, a button located on the drive sleeve, and a clutch which upon depression of the button prevents rotation between the dose dial sleeve and the drive sleeve.
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Citations
20 Claims
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1. A drug delivery device comprising:
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a housing; a dose dial sleeve that can be rotated out of the housing to select a dose of a product contained within a cartridge, the dose dial sleeve provided with graphics on an outer surface; a rotatable piston rod for expelling the selected dose of the product wherein the housing comprises a unitary housing within which the dose dial sleeve and the piston rod are moveably retained and a cylindrical insert rotationally and axially fixed to the housing and threadedly engaged to the piston rod, where the cylindrical insert has a cylindrical portion extending longitudinally in a proximal direction enclosing a portion of the piston rod wherein the unitary housing is configured to completely enclose the cartridge, the dose dial sleeve, the piston rod, and the cylindrical insert. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A drug delivery device comprising:
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a housing; a piston rod comprising a screw thread; an insert located in the housing and through which the piston rod may rotate; a ratchet associated with the insert to ensure the piston rod only rotates in a single direction through the insert; a dose dial sleeve rotatable with respect to the housing and the insert, the dose dial sleeve provided with graphics on an outer surface; a drive sleeve which is axially displaceable but not rotatable with respect to the piston rod; a button located on the drive sleeve and rotatable with respect to the drive sleeve, and a clutch which upon depression of the button prevents rotation between the dose dial sleeve and the drive sleeve wherein the housing is configured to completely enclose a cartridge, the dose dial sleeve, the piston rod, and the insert. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification