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Details for Patent: 8,021,345

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Details for Patent: 8,021,345

Title:Pen-type injector
Abstract: The present invention relates to injectors, such as pen-type injectors, that provide for administration of medicinal products from a multidose cartridge and permit a user to set the delivery dose. The injector may include a housing, a cartridge containing medicinal product, the cartridge being retained within the housing, means for selecting a dose of medicinal product to be expelled, and means for expelling the selected dose of medicinal product. The housing may be a unitary housing within which the means for selecting a dose and the means for expelling the selected dose are moveably retained. Alternatively, the injector may include a housing, a piston rod, an insert located in the housing and through which the piston may rotate, a ratchet, a dose dial sleeve, a drive sleeve, 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.
Inventor(s): Veasey; Robert Frederick (Warwickshire, GB), Langley; Christopher Nigel (Warwickshire, GB), Wimpenny; Steven (Warwickshire, GB)
Assignee: DCA Design International Ltd. (GB)
Filing Date:Oct 08, 2010
Application Number:12/900,725
Claims:1. A pen-type injector, comprising: a housing; a piston rod having a screw thread; a cylindrical insert located in the housing, where the insert is rotationally fixed with respect to the housing during dose setting and has a cylindrical portion extending longitudinally in a proximal direction enclosing a portion of the piston rod; a ratchet to ensure the piston rod only rotates in a single direction; a dose dial sleeve rotatable with respect to the housing and the insert during dose setting; a drive sleeve engaged with the piston rod but not rotatable with respect to the piston rod; and a clutch which controls rotation between the dose dial sleeve and the drive sleeve.

2. An injector according to claim 1, characterized in that an outer surface of the dose dial sleeve includes graphics and wherein the housing is provided with an aperture or window through which a portion of the graphics may be viewed.
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