Combination Temperature Exposure Indicator for Vaccine Vials
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Solution Overview
Problem
Current freeze indicators lack a reliable and cost-effective solution to monitor exposure to freezing temperatures and cumulative ambient temperature exposure, particularly for sensitive products like vaccines, which can be damaged by freezing or excessive heat, leading to quality loss and disposal issues.
Innovation Solution
A combination temperature exposure indicator that integrates a freeze indicator and a cumulative ambient time-temperature indicator on a single device, providing visual signals for freeze exposure and cumulative temperature exposure, suitable for attachment to small host products like vaccine vials, using active dispersions of inorganic pigments in a liquid medium with vapor sealing techniques to ensure consistency and longevity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a freeze indicator is used to detect freezing exposure, then freeze damage can be identified, but cumulative ambient temperature exposure cannot be monitored
Solution Approach 1:
The patent combines a freeze indicator and a cumulative ambient temperature indicator into a single device. The freeze indicator uses a colloidal dispersion that becomes opaque upon freezing, while the cumulative temperature indicator uses a time-temperature indicator that changes color based on cumulative thermal exposure. Both indicators are integrated on one substrate, allowing simultaneous monitoring of both freeze events and cumulative heat exposure.
Solution Approach 2:
The single indicator device performs multiple functions: detecting freeze exposure through the freeze indicator portion and monitoring cumulative ambient temperature exposure through the time-temperature indicator portion. This multi-functional design eliminates the need for separate devices for each type of temperature monitoring.
2Reliability
If separate freeze indicators and cumulative temperature indicators are used, then each can be optimized for its specific function, but device complexity and cost increase
Solution Approach 1:
The patent integrates both the freeze indicator and cumulative ambient temperature indicator onto a single substrate, creating one unified device that performs both monitoring functions. This eliminates the need for multiple separate devices while maintaining the reliability of each indicator type.
Solution Approach 2:
The single device is designed to perform multiple monitoring functions simultaneously, reducing the overall system complexity and the number of components needed while maintaining optimized performance for each specific temperature monitoring task.
3Measurement precision
If traditional freeze indicators are used, then freeze exposure can be detected, but the indicators are not suitable for small host products like vaccine vials
Solution Approach 1:
The indicator device uses a thin substrate that can be easily attached to small host products like vaccine vials. The freeze indicator and cumulative temperature indicator are both implemented in a compact, thin-form-factor design that accommodates small surface areas while maintaining detection accuracy.
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 solution provides a reliable, cost-effective, and consistent visual indication of temperature exposure, enabling users to identify damaged products promptly, reducing waste and ensuring the quality of temperature-sensitive items by distinguishing between freeze and heat-related damage.
Implementation Method 1
Hanlon's colloidal dispersions are described as becoming nonreversibly destabilized upon freezing, transforming a translucent dispersion to a substantially opaque dispersion.
Implementation Method 2
a colloidal dispersion of inorganic pigment particles in a liquid medium which provides a distinct appearance change indicative of freeze exposure
Implementation Method 3
using active dispersions of inorganic pigments in a liquid medium with vapor sealing techniques to ensure consistency and longevity
Data Source
AI summary
A combination temperature exposure indicator suitable for attachment to, or association with, a host product has a substrate, a freeze indicator supported by the substrate and a cumulative ambient time-temperature indicator also supported by the substrate. The freeze indicator can provide a visual indication of exposure of the freeze indicator to a freezing or near-freezing temperature and the cumulative time-temperature indicator can provide a visual indication of exposure of the cumulative time-temperature indicator to a predetermined cumulative time-temperature value. Also disclosed are: a combination freeze indicator and threshold temperature indicator; a combination threshold indicator and cumulative temperature indicator; and three-way combination indicators that can provide indications of cumulative past temperature exposure, exposure to freezing temperatures and exposure to a temperature above a threshold.