HRV-Guided Cooling Control for Patient Heat Exchange Bladders
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Solution Overview
Problem
Existing cooling systems for brain trauma and physical activity fail to adequately control cooling magnitude and duration based on physiological measurements, leading to discomfort and potential health risks.
Innovation Solution
A system incorporating a pump, heat exchanger, bladder, thermometer, and heart rate variability (HRV) sensor, controlled by a controller to regulate fluid temperature and flow based on HRV signals, ensuring precise cooling or warming adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If cooling intensity and duration are fixed without physiological feedback, then system complexity is reduced, but treatment precision and safety deteriorate
Solution Approach 1:
The system incorporates HRV sensors that continuously monitor physiological parameters and feed this information back to the controller. The controller adjusts cooling intensity and duration based on real-time HRV data, enabling precise tailoring of cooling protocols to individual physiological responses while maintaining system complexity at acceptable levels through automated feedback loops.
Solution Approach 2:
The cooling system transitions from static, pre-programmed cooling protocols to dynamic adjustment based on real-time physiological monitoring. The controller continuously modifies cooling parameters (intensity, duration) in response to changing HRV measurements, allowing the system to adapt to the patient's evolving physiological state during treatment.
2Reliability
If cooling is applied without physiological monitoring, then device complexity is reduced, but patient safety and comfort deteriorate
Solution Approach 1:
HRV sensors provide continuous physiological feedback to the controller, which monitors patient response to cooling treatment. This feedback mechanism enables early detection of adverse reactions or excessive cooling effects, allowing immediate adjustment of cooling parameters to maintain patient safety and comfort throughout the treatment process.
Solution Approach 2:
The system uses the patient's own physiological signals (HRV) to automatically regulate cooling intensity and duration. The controller interprets HRV data and self-adjusts cooling parameters without requiring constant manual intervention, enabling the system to serve itself in maintaining safe and effective treatment parameters based on real-time patient response.
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 tailored cooling protocols that enhance comfort and safety by dynamically adjusting cooling intensity and duration based on HRV, preventing dangerous heart rate variations.
Implementation Method 1
a heat exchanger, in fluid communication with the pump. The bladder is configured to be placed on a person, and is in fluid communication with the heat exchanger
Implementation Method 2
removing heat from the fluid as the fluid passes through the heat exchanger
Implementation Method 3
A system for cooling a person includes a pump, a heat exchanger, a bladder, a thermometer
Data Source
AI summary
A system for cooling a person includes a pump, a heat exchanger, a bladder, a thermometer, a heart rate variability (HRV) sensor, and a controller. The heat exchanger is in fluid communication with the pump. The bladder is configured to be placed on a person, and is in fluid communication with the heat exchanger. The thermometer measures a temperature of fluid passing through at least one of the pump, the heat exchanger and the bladder. The controller is in electrical communication with the thermometer, the HRV sensor and the heat exchanger, and is configured to control power delivered to or flow through the heat exchanger based on signals received from the HRV sensor.