Safety Clip for Medical Injection Device Assembly
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Solution Overview
Problem
Medical injection devices, particularly autoinjectors, face issues during assembly where a pre-cocked drive assembly can accidentally be actuated, rendering the device unusable, and existing locking arrangements require separate coupling and decoupling steps, slowing assembly and potentially making the device unusable if left in place.
Innovation Solution
A safety clip is integrated with the medical injection device's motor body to secure the lever actuation member in a locked position, preventing accidental actuation during assembly, and is designed to move out of the way upon assembly completion, allowing the device to function properly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking arrangement is used to prevent accidental actuation during assembly, then safety is improved, but assembly time increases due to separate coupling and decoupling steps
Solution Approach 1:
The safety clip integrates the locking function directly into the drive assembly structure, merging the safety mechanism with the existing components. The clip engages with the lever actuation member and drive shaft, eliminating the need for separate locking components and their associated coupling/decoupling steps, thus reducing assembly time while maintaining safety.
Solution Approach 2:
The safety clip is designed to be automatically engaged during the assembly process itself. As the drive assembly is inserted into the housing, the safety clip naturally positions itself to lock the lever actuation member in the safe position. The clip's geometry and the assembly sequence ensure that safety protection is provided without requiring separate manual locking actions.
2Reliability
If a locking component is used to prevent accidental firing, then safety is improved, but device complexity increases due to additional components
Solution Approach 1:
The safety clip is integrated with existing drive assembly components rather than being a completely separate element. It engages with the lever actuation member and drive shaft structures that are already part of the device, thereby providing safety functionality without significantly increasing the total component count or overall device complexity.
Solution Approach 2:
The safety clip serves multiple functions: it locks the lever actuation member in the safe position during assembly, and it is designed to be automatically disengaged during the normal operation sequence. This multi-functionality reduces the need for additional dedicated components for each function, thereby simplifying the overall device structure.
Data Source
AI summary
Disclosed herein is a subassembly for a medical injection device and a medical injection device including the subassembly. The subassembly includes a first housing shell, a drive assembly configured to move a stopper of a syringe assembly, the drive assembly including a drive member, a plunger body, and a lever actuation member moveable between a locked position where actuation of the drive assembly is prevented and a released position where actuation of the drive assembly is allowed, the drive assembly configured to be received at least partially within the housing shell. The subassembly also includes a motor body, the motor body receiving at least a portion of the drive assembly therein and configured to be received at least partially within the housing shell, and a safety clip configured to couple to the motor body and to secure the lever actuation member in the locked position.