Autoinjector Temperature Inhibition Mechanism
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Solution Overview
Problem
Autoinjectors often fail to maintain consistent performance across a wide temperature range, particularly when the viscosity of injected substances varies significantly with temperature, leading to potential misuse under adverse temperature conditions.
Innovation Solution
Incorporating a temperature-sensitive arrangement with thermally responsive members or electrically driven elements that inhibit device operation and provide visual indicators when temperatures fall outside predetermined ranges, ensuring safe and reliable use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the autoinjector is designed to operate across a wide temperature range, then the device's adaptability is improved, but the reliability deteriorates due to significant variations in fluid viscosity with temperature
Solution Approach 1:
The patent implements a temperature sensing system that provides feedback about the current temperature to both the user (via display or indicator) and the control system. This allows the device to monitor temperature conditions and alert users when the temperature is outside the optimal range for consistent injection performance, enabling them to adjust or avoid use under adverse conditions.
Solution Approach 2:
The patent changes the operational parameters by establishing predetermined minimum and maximum temperature thresholds for device operation. The system monitors temperature and compares it against these parameters, actively inhibiting operation or passively indicating when temperatures fall outside the range where reliable injection is achievable, thus maintaining consistency where possible.
2Reliability
If temperature monitoring and inhibition systems are added to the autoinjector, then the reliability is improved by preventing misuse, but the device complexity increases
Solution Approach 1:
The patent replaces complex mechanical temperature control mechanisms with simpler electronic or optical sensing systems. Instead of using mechanical components to physically prevent operation at wrong temperatures, the system uses temperature sensors combined with electronic control or visual indicators to achieve the same safety function with fewer moving parts and simpler architecture.
Solution Approach 2:
The patent introduces an intermediary temperature sensing system that acts as a mediator between the physical temperature condition and the device operation. This intermediary layer monitors temperature and translates it into control signals or visual information, allowing the device to respond to temperature conditions without requiring direct mechanical intervention or complex integrated control.
3Object-affected harmful factors
If active inhibition mechanisms are implemented to prevent operation outside temperature range, then the safety is improved, but the ease of operation deteriorates due to additional user constraints
Solution Approach 1:
The patent applies preliminary action by checking the temperature condition before allowing device operation. The temperature is monitored and evaluated in advance, and the system either prevents the firing mechanism from engaging or displays a warning to the user before the injection can proceed. This ensures that unsafe operations are prevented before they can occur, rather than reacting after a problem arises.
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
Prevents device operation under inconsistent temperatures, ensuring user safety by actively or passively alerting against misuse and maintaining consistent performance across varying temperature conditions.
Implementation Method 1
a thermally responsive member which, upon passing a predetermined temperature adopts a position in which it inhibits operation of the autoinjector
Implementation Method 2
The or each thermally responsive member may be any suitable member that changes shape with temperature, such as is a bi-morph or bi-metallic strip
Implementation Method 3
an electrically driven inhibiting element responsive to the output of a heat sensor
Implementation Method 4
said heat-sensitive indicator may comprise a coating of thermochromic material adapted to reveal or conceal a symbol or indicia relating to the operational state of the autoinjector under predetermined temperature conditions
Data Source
Figure 1~2
Figure 3~4
AI summary
An injection device operable to deliver a dose of medicament from a syringe or cartridge includes a temperature-sensitive arrangement for inhibiting operation thereof under predetermined temperature conditions. This may comprise a thermally responsive element that adopts a position in which operation of the device is inhibited when a temperature level is passed.