Injection Device Locking Mechanism for Syringe Stability
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Solution Overview
Problem
Existing injection devices face challenges in maintaining syringe sterility and preventing accidental ejection of syringe contents due to weak return springs and mechanical failures, leading to potential damage and exposure risks.
Innovation Solution
An injection device with a locking mechanism that prevents syringe movement during cap removal and includes a resilient locking system to secure the syringe in place, ensuring the syringe remains stationary during cap removal and preventing accidental activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the return spring is made weak to allow syringe retraction, then the syringe can be retracted by the return spring, but the syringe may be accidentally activated or damaged during boot removal
Solution Approach 1:
The locking mechanism is engaged before boot removal to prevent syringe movement. The locking component is positioned to engage with the syringe carrier or housing structure prior to the boot being removed, ensuring the syringe remains stable throughout the boot removal process and preventing accidental activation.
Solution Approach 2:
The locking mechanism acts as an intermediary between the syringe and the housing during boot removal. It provides a temporary constraint that prevents direct movement of the syringe while allowing the boot to be removed, thereby mediating between the need for syringe stability and the operation of removing the boot.
2Ease of operation
If the syringe is made moveable to allow extension, then the syringe can be extended for injection, but the syringe may be accidentally activated by mechanical failure
Solution Approach 1:
The locking mechanism is engaged before syringe extension to prevent accidental activation. The locking component is positioned to engage with the syringe carrier or housing structure prior to the syringe being extended, ensuring the syringe remains stable and cannot be accidentally activated during the extension process.
Solution Approach 2:
The locking mechanism provides dynamic control over syringe movement. It allows the syringe to be extended when needed by disengaging the locking component, while automatically engaging to prevent accidental activation during storage and handling. This dynamic engagement and disengagement provides reliable control over syringe extension.
3Ease of operation
If the cap is made removable to allow access, then the cap can be removed for needle access, but the syringe may move during cap removal
Solution Approach 1:
The locking mechanism is engaged before cap removal to prevent syringe movement. The locking component is positioned to engage with the syringe carrier or housing structure prior to the cap being removed, ensuring the syringe remains stable throughout the cap removal process and preventing accidental activation.
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
The locking mechanism effectively maintains syringe sterility and prevents accidental ejection, reducing the risk of damage and exposure, while allowing safe and controlled removal of the cap and needle shield.
Implementation Method 1
Each locking component comprises a resilient member which abuts the housing and maintains the locking mechanism in its engaged position when no pressure is applied to its respective button.
Data Source
Figure 1a~1c
Figure 2a
Figure 2b
AI summary
An injection device comprises a locking-mechanism in the form of two buttons (17) located on the front end of the injection device. In an engaged position, the locking mechanism prevents removal of a cap (111) from the injection device and, in a disengaged position, prevents movement of a syringe carrier (127) holding a syringe but permits removal of the cap from the housing. This assists in preventing damage to the syringe prior to actuation of the injection device.