Heat Cycle Counter for Bioprocess Measurement Probes
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Solution Overview
Problem
Measurement probes in bioprocess industries face degradation and failure due to exposure to extreme temperatures during sterilization and cleaning processes, leading to inaccurate lifespan predictions and increased costs from premature replacement or failure during use.
Innovation Solution
A measurement device that automatically detects and counts heat cycles, including autoclave, steam-in-place, and clean-in-place cycles, using temperature and pressure responsive elements to increment a counter and power off during extreme conditions, allowing for accurate tracking of probe usage and determining when to replace the probes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If measurement probes are frequently replaced to ensure accuracy, then measurement reliability is improved, but operational costs and downtime increase
Solution Approach 1:
The probe incorporates an autonomous heat cycle counter that continuously monitors and records the number of sterilization cycles experienced. This feedback mechanism provides real-time information about probe degradation, enabling operators to replace probes based on actual usage rather than fixed schedules, thus optimizing both reliability and downtime.
Solution Approach 2:
The probe performs self-monitoring of its own degradation through integrated temperature and pressure sensors that automatically track heat cycle exposure. This self-service capability eliminates the need for external monitoring systems and enables autonomous decision-making regarding probe replacement timing.
2Productivity
If probes are used beyond recommended heat cycle limits to reduce replacement frequency, then productivity is improved, but measurement reliability deteriorates
Solution Approach 1:
The heat cycle counter provides continuous feedback on probe usage, allowing operators to monitor approaching degradation thresholds. This enables proactive replacement planning that maintains measurement reliability while maximizing productive use of each probe throughout its actual service life.
3Reliability
If autoclave sterilization is used to ensure complete sterilization, then sterilization effectiveness is improved, but probe degradation accelerates
Solution Approach 1:
The probe tracks heat cycle exposure in advance, building a cumulative history of sterilization events. This preliminary monitoring allows operators to anticipate probe degradation and plan replacements before critical failure occurs, balancing sterilization requirements with probe longevity.
4Reliability
If heat cycle counting is manually tracked to monitor probe condition, then measurement reliability is improved, but operational complexity increases
Solution Approach 1:
The probe autonomously performs heat cycle counting using integrated sensors and processing circuitry. This self-service approach eliminates the need for complex external tracking systems or manual recording procedures, reducing operational complexity while maintaining reliable probe condition monitoring.
5Duration of action of stationary object
If probes are protected from high temperatures to extend lifespan, then probe durability is improved, but sterilization effectiveness may be compromised
Solution Approach 1:
The probe separates the sensing elements from the electronic circuitry, with only the sensor portion exposed to high-temperature sterilization environments. This segmentation protects the temperature-sensitive electronics while allowing the sensor to experience full sterilization conditions, thereby maintaining both probe lifespan and sterilization effectiveness.
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
Enables accurate monitoring of probe usage, reducing the risk of failure and costs by providing an automated and accurate count of heat cycles, ensuring timely replacement and maintaining process control.
Implementation Method 1
A heat cycle detection unit is electrically coupled to the condition responsive element. The heat cycle detection unit includes a detection module configured to detect a heat cycle event in response to a signal from the condition responsive element.
Implementation Method 2
The condition responsive element is a pressure responsive element configured to change state in response to a pressure exceeding a threshold pressure
Implementation Method 3
In one embodiment, the condition responsive element is a bimetallic strip configured to change shape in response to a temperature exceeding a threshold temperature. The changing shape of the bimetallic strip opens or closes an electrical contact.
Implementation Method 4
In another embodiment, the condition responsive element is a shape memory alloy configured to change shape in response to a temperature exceeding a threshold temperature.
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A measurement device is disclosed, embodiments of which are adapted to withstand, detect, and record detection of heat cycle events, including autoclave cycles. Embodiments of the measurement device comprise a sensor for measuring a characteristic of a medium and a heat cycle detection unit. Embodiments of the heat cycle detection unit comprise a temperature or pressure responsive element, a detection module, data interface, and data memory. In one disclosed embodiment, the temperature or pressure responsive element is configured to respond to a characteristic of a heat cycle event while the heat cycle detection unit is powered off. In another disclosed embodiment, the detection module is configured to automatically power off the heat cycle detection unit in response to detecting an autoclave cycle. Methods of using the devices are also disclosed.