Injection Add-On Spacer for Blocking Movable Part During Assembly
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Solution Overview
Problem
Existing add-on devices for injection devices face challenges in user-friendly detachment and reattachment, often leading to unintended operation due to difficulties in preventing movement of the movable part relative to the device body during assembly.
Innovation Solution
A spacer is detachably fastened to the add-on device, acting as a mechanical stopper to prevent movement of the movable part relative to the device body along a specific direction, ensuring proper assembly and preventing unintended activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the movable part is made movable relative to the device body for dose injection, then the functionality of dose dispensing is improved, but unintended operation occurs during detachment and reattachment
Solution Approach 1:
A spacer is introduced as an intermediary component between the movable part and device body. The spacer includes a blocking portion that prevents the movable part from moving relative to the device body during detachment and reattachment operations, while allowing the add-on device to be properly attached to the injection device. This mediator resolves the contradiction by enabling reliable operation without unintended activation.
2Ease of operation
If the add-on device is designed for easy detachment and reattachment, then ease of operation is improved, but movement control of the movable part deteriorates
Solution Approach 1:
The spacer serves as a temporary intermediary that simplifies the attachment process. Users can easily attach the add-on device to the injection device while the spacer is in place. The spacer's blocking portion automatically prevents unwanted movement of the movable part without requiring users to understand or control complex mechanisms, thus maintaining ease of operation while ensuring movement control.
Solution Approach 2:
The spacer is attached to the add-on device in advance before the actual use with the injection device. This preliminary action ensures that the blocking function is already in place, preventing unintended movement of the movable part during the subsequent attachment and operation phases, without adding complexity to the user's interaction.
3Reliability
If the movable part is constrained during assembly, then reliability is improved, but ease of operation deteriorates
Solution Approach 1:
The spacer acts as a mediator that provides reliable constraint of the movable part during assembly through its blocking portion, while simultaneously maintaining ease of operation. The spacer is designed to be easily attached and detached, and its presence during assembly automatically ensures proper constraint without requiring users to perform complex manipulation or understand assembly intricacies.
Data Source
AI summary
An add-on device of an injection device includes a device body and a movable part. A spacer for the add-on device is detachably fastenable to the add-on device. The movable part is movable relative to the device body along a first direction. The spacer includes a spacer body including an engaging portion to detachably fasten to one of the device body and the movable part. The spacer body is operable to impede a movement of the movable part relative to the device body with regard to the first direction when fastened to the device body or the movable part.