Bi-dose device with segmented piston and puller clips
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Solution Overview
Problem
Existing BI-Dose systems lack adequate protection and control for unintentional operation, particularly when handling both small and large application quantities, and do not provide clear visual feedback for dosing volumes.
Innovation Solution
A reduced-parts BI-Dose system with a sliding actuation and sealing plug assembly, featuring integrated dosing protection and self-explanatory application functions, including a movable stopper, finger rest, and puller clips that allow for precise control of dosing volumes and prevent unintentional operation through a secure anchoring mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a stepped piston principle is used for dosing control, then dosing precision is improved, but device complexity increases and protection against unintentional operation is insufficient
Solution Approach 1:
The piston rod is segmented with multiple puller clips positioned at different locations, each corresponding to a specific dosing volume. This segmentation allows the single piston to deliver multiple predetermined doses by removing different numbers of puller clips, achieving dosing precision without complex multi-piston mechanisms.
Solution Approach 2:
The puller clips are pre-positioned on the piston rod at specific locations corresponding to desired dosing volumes. Before operation, the user selects the appropriate number of clips to remove based on the required dose, preparing the system in advance for precise dosing control without requiring complex real-time adjustment mechanisms.
2Reliability
If additional dosing protection is added to protect against unintentional operation, then reliability is improved, but device complexity increases
Solution Approach 1:
The dosing protection function is merged with the dosing control mechanism itself. The puller clips serve dual purposes: they control the piston stroke length for dosing precision and simultaneously act as safety locks preventing unintentional operation. This integration achieves reliability without adding separate protection mechanisms.
Solution Approach 2:
The system uses its own existing components (puller clips and piston rod) to provide dosing protection against unintentional operation. The clips inherently prevent the piston from moving unless deliberately removed by the user, making the system self-protecting without requiring external safety devices.
3Ease of operation
If visual control over dosing strokes is implemented, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The cartridge is made transparent or translucent, allowing the user to visually observe the medium level and dosing progress through the cartridge wall. This transparency provides clear visual feedback about the remaining dose and administration progress without adding complex display mechanisms or indicators.
Data Source
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AI summary
The invention relates to a BI-Dose device (1) consisting of a liquid cartridge (2) and a control unit (3), wherein the liquid cartridge (2) can be emptied by means of an actuating piston (6), wherein the actuating piston (6) has a first dispensing clamp (7) and a second dispensing clamp (8), wherein the two dispensing clamps (7, 8) are operatively connected to each other.