Dose setting device
HUP0002162A3Inactive Publication Date: 2001-02-28NOVO NORDISK AS
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Patent Information
- Application Number
- HU2000002162
- Authority / Receiving Office
- HU · HU
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 1998-06-15
- Filing Date
- 1998-06-15
- Publication Date
- 2001-02-28
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Technical Problem
Existing injection devices with flexible piston rods are unsuitable for short, compact designs due to the need for large ampoules, and require manual reassembly after each use, leading to inefficiencies and potential dose inaccuracies.
Method used
A dose adjustment device with a piston rod composed of two parts, where the second part is rotatable relative to the first, connected by internal and external threads, allowing for precise dose adjustment and automatic reassembly without manual screwing, featuring a gear-connected injection mechanism for consistent dose delivery.
Benefits of technology
Enables precise dose setting and automatic reassembly, ensuring consistent injection accuracy and ease of use in compact devices, reducing manual effort and potential errors.
✦ Generated by Eureka AI based on patent content.
Abstract
The invention relates to a dose adjustment device for a drug delivery system, which has a piston rod consisting of a first part and a second part, one end of which is continuously pressed into the first end of an ampoule containing a drug, whereby the piston closing the first end of the ampoule is pressed into the ampoule, whereby the drug is squeezed out through the delivery member - injection needle - attached to the other end of the ampoule; for dose adjustment, the second part of the piston rod is designed to be rotatable relative to the first part of the piston rod; the first and second parts are connected by internal and external threading at a specific part, whereby the total length of the piston rod, which is proportional to the degree of rotation of the second part relative to the first part, is increased by a distance;during the rotation of the second part, a point of the piston rod in this second part is moved away from a fixed stop position relative to the church and the return movement in this point stop position is configured in a set dose-injecting manner;The first part of the piston rod is guided in the housing so that it can be moved axially, but not rotated, while the second part of the piston rod, which is further away from the piston, is fixed so that it can be moved both rotatably and axially. The dose setting device according to the invention is characterized in that the first part (6) of the piston rod is designed to rest on the piston (2) in the ampoule (1), the second part (9) of the piston (2) is connected to a gear (19) which is connected to the teeth - rim - on a dose setting drum (20), and thus the second part (9) of the piston rod is designed to be rotatable by rotating the dose setting drum (20), and has an injection mechanism provided with an injection button (10) movable between a protruding position and a depressed position, which acts on the second part of the piston rod (9) and has elements for moving this second part to the abutment position of the above point on the second part when the injection button (10) is pressed. à;
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