Injector Dosing Device With Positive-Lock Positioning
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Solution Overview
Problem
Conventional injection devices with electric drives can malfunction, leading to incorrect substance delivery, posing risks such as overdoses, especially for users with limited mobility.
Innovation Solution
An injector with a dosing device featuring a drive coupled to an actuating device with a release and blocking position, utilizing a positive locking mechanism to enable controlled, portion-wise dispensing through a kinematic chain, allowing precise and safe administration of medicinal substances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an electric drive is used to enable automated dosing, then ease of operation is improved for users with limited mobility, but reliability deteriorates due to risk of malfunction and incorrect substance delivery
Solution Approach 1:
A positioning device with a positioning element acts as an intermediary between the actuating device and the drive. This positioning element can be selectively positioned in a first position to enable drive operation or a second position to block drive operation, providing a mechanical safety layer that prevents incorrect substance delivery even if the electronic control system fails.
Solution Approach 2:
The dosing mechanism is segmented into distinct functional components: the actuating device for user input, the positioning device with movable positioning element for intermediate control, and the drive for actual substance delivery. This segmentation allows each component to perform its specific function reliably, with the positioning element serving as a mechanical gatekeeper that must be properly positioned for the drive to operate.
2Reliability
If a positioning device with movable positioning element is added to control drive operation, then reliability is improved through mechanical blocking, but device complexity increases
Solution Approach 1:
The positioning device is integrated with the actuating device such that the positioning element is selectively positionable based on actuating device operation. This merging allows the safety mechanism to be triggered by the same user action that initiates dosing, eliminating the need for separate controls and reducing overall device complexity while maintaining reliability.
Data Source
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AI summary
The invention relates to a dosing device for an injector (1) for the dosed administration of a medical substance, comprising a drive, a dispensing element which can be moved by the drive to dispense the substance out of the injector (1), and an actuation means. The actuation means has a release position in which the drive is released by the actuation means and the drive can move the dispensing element. The actuation means also has a locking position in which the drive is locked by means of a form fit by the actuation means, as a result of which the drive cannot move the dispensing element. In the release position, the actuation means is coupled to the drive so that a movement of the actuation means is transferred to the drive or a movement of the drive is transferred to the actuation means. The invention also relates to an injector (1) having such a dosing device.