Auto Injector Battery Voltage Check
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Solution Overview
Problem
Auto injectors face challenges in ensuring sufficient battery power for completing medicament delivery processes, especially at lower temperatures where the viscosity of medicaments increases, leading to higher battery voltage requirements, and existing solutions may leave cartridges stuck due to power depletion during use.
Innovation Solution
An auto injector system with a temperature sensor, battery calculation module, and processing unit that checks the residual battery voltage level against a temperature-dependent threshold, preventing the initiation of the medicament delivery process if the voltage is insufficient, thus ensuring the cartridge can be safely removed after use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the auto injector is used at lower temperatures, then the medicament delivery function is maintained, but the battery voltage requirement increases due to higher medicament viscosity
Solution Approach 1:
The system performs a preliminary check of the battery voltage level before initiating the medicament delivery process. The processing unit determines whether the battery can provide sufficient voltage for the entire delivery process based on current temperature conditions. If the voltage is insufficient, the system prevents initiation of the process, avoiding the risk of power depletion during delivery.
Solution Approach 2:
The system continuously monitors battery voltage and temperature conditions, and uses this feedback to determine whether to allow or prevent the medicament delivery process. The processing unit adjusts the operational state based on real-time measurements of battery capacity and environmental conditions.
2Reliability
If the battery power is insufficient, then the medicament delivery process cannot be initiated, but this may leave cartridges stuck in the device
Solution Approach 1:
The system takes preliminary action to prevent the harmful state of having a stuck cartridge by checking battery voltage before process initiation. By preventing startup when voltage is insufficient, the system avoids the scenario where the plunger rod cannot complete its cycle and leave the cartridge locked in place.
Solution Approach 2:
The system provides a safety margin by requiring sufficient battery voltage not just for the delivery process but also for the subsequent cartridge unlocking and removal operations. This cushioning ensures that even if voltage drops during operation, there remains enough power to complete the full cycle including cartridge release.
3Reliability
If the auto injector prevents process initiation due to low battery voltage, then complete medicament delivery is ensured, but the device cannot be charged when a cartridge is inserted
Solution Approach 1:
The system performs preliminary assessment of battery voltage and provides clear information to the user about charging requirements before the medicament delivery process is attempted. This allows users to charge the device in advance, avoiding delays during the actual delivery process.
Data Source
AI summary
Described herein is an auto injector for administering a medicament, the auto injector comprising a function, which initiate the auto injector process only if the auto injector battery is sufficiently charged.