Pen-type injector
First Claim
1. A pen-type injector, comprising:
- a housing;
a piston rod having a screw thread and rotatable in only one direction relative to the housing;
an insert located in the housing threadedly engaged with the piston rod;
a ratchet associated with the insert configured to allow the piston rod to rotate only in a single direction through the insert;
a dose dial sleeve rotatable with respect to the housing and the insert;
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
clutch means which upon depression of the button prevents rotation between the dose dial sleeve and the drive sleeve.
2 Assignments
0 Petitions
Accused Products
Abstract
A pen-type injector is improved so that a user may select a delivery dose of medicinal product from a multidose cartridge. The injector includes a housing. a cartridge containing medicinal product retained within a housing, a piston rod, a dose selecting member to select a dose of medicinal product to be expelled, and a drive member to expel the selected dose of 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 ratchet means associated with the insert to ensure the piston rod only rotates in a single direction through the insert, a button located on the drive sleeve, and clutch means which upon depression of the button prevents rotation between the dose dial sleeve and the drive sleeve.
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Citations
13 Claims
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1. A pen-type injector, comprising:
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a housing; a piston rod having a screw thread and rotatable in only one direction relative to the housing; an insert located in the housing threadedly engaged with the piston rod; a ratchet associated with the insert configured to allow the piston rod to rotate only in a single direction through the insert; a dose dial sleeve rotatable with respect to the housing and the insert; 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 clutch means which upon depression of the button prevents rotation between the dose dial sleeve and the drive sleeve. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification