Injection Device Locking Mechanism Integrally Formed Biasing
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Solution Overview
Problem
Existing injection devices require costly and complex small coil springs for the safety interlock mechanism, which can be easily missed during assembly and increase manufacturing costs.
Innovation Solution
The injection device incorporates an integrally formed biasing mechanism, such as resilient arms, within the locking mechanism that automatically returns to a locked position, eliminating the need for external springs and simplifying assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If small coil springs are used to bias the locking mechanism, then the locking mechanism can be activated, but the assembly complexity and cost increase
Solution Approach 1:
The biasing function is merged with the locking mechanism itself through integral formation. The resilient arms are formed as part of the locking mechanism structure, eliminating the need for separate coil springs. This integration reduces the number of components and simplifies assembly while maintaining the biasing function necessary for locking mechanism activation.
Solution Approach 2:
The locking mechanism provides its own biasing function through integrally formed resilient arms. Instead of requiring external springs to be installed, the mechanism contains its own biasing elements that are formed as part of its structure. This self-service approach eliminates the need for separate biasing components and their associated assembly steps.
2Reliability
If small coil springs are used to bias the locking mechanism, then the locking mechanism can be activated, but manufacturing cost increases
Solution Approach 1:
The biasing function is merged with the locking mechanism itself through integral formation. The resilient arms are formed as part of the locking mechanism structure, eliminating the need for separate coil springs. This integration reduces the number of components and simplifies assembly while maintaining the biasing function necessary for locking mechanism activation.
Solution Approach 2:
The locking mechanism provides its own biasing function through integrally formed resilient arms. Instead of requiring external springs to be installed, the mechanism contains its own biasing elements that are formed as part of its structure. This self-service approach eliminates the need for separate biasing components and their associated assembly steps.
3Reliability
If small coil springs are used to bias the locking mechanism, then the locking mechanism can be activated, but the risk of missing springs during assembly increases
Solution Approach 1:
The biasing function is merged with the locking mechanism itself through integral formation. The resilient arms are formed as part of the locking mechanism structure, eliminating the need for separate coil springs. This integration reduces the number of components and simplifies assembly while maintaining the biasing function necessary for locking mechanism activation.
Solution Approach 2:
The locking mechanism provides its own biasing function through integrally formed resilient arms. Instead of requiring external springs to be installed, the mechanism contains its own biasing elements that are formed as part of its structure. This self-service approach eliminates the need for separate biasing components and their associated assembly steps.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design reduces assembly complexity and cost by using internal biasing means, ensuring reliable operation without the need for small springs, while maintaining effective locking and unlocking functionality.
Implementation Method 1
the locking mechanism or the housing includes integrally formed biasing means adapted to return the locking mechanism to a locked position when it is not activated
Data Source
AI summary
An injection device (110) comprises a housing (112) adapted to receive a syringe (122) having a discharge nozzle (118) , an actuator (114) and a drive (120) acted upon by the actuator which acts upon the syringe to advance it from a retracted position in which the discharge nozzle is contained within the housing to an extended position in which the discharge nozzle extends from the housing. There is a locking mechanism (HS) in communication with the actuator and activatable to be moved from a locked position in which the actuator is prevented from releasing the drive to an unlocked position in which the actuator is operable to act upon the drive to advance the syringe. The locking mechanism or the housing includes integrally formed biasing means (210) adapted to return the locking mechanism to a locked position when it is not activated. There is no need for separate springs to be used to bias the releasable locking mechanism out of the housing.