Cuff Inflation Controller Adaptive Pump Control
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Solution Overview
Problem
Existing cuff inflation controllers for tracheal tubes may overshoot or undershoot target pressure during adjustments, leading to temporary cuff overpressure and underpressure, particularly for cuffs of sizes different from the average used in tuning control parameters, causing patient discomfort and prolonged pressure stabilization.
Innovation Solution
A cuff inflation controller that determines the size of the cuff by detecting pressure changes in response to a fixed volume of inflation fluid and sets variable control parameters for the pump based on the cuff size, ensuring stable pressure maintenance by adjusting pump output accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fixed control parameters are used for the pump, then the system is simple to operate, but pressure stability deteriorates for cuffs of sizes different from the average
Solution Approach 1:
The control parameters of the pump are made dynamic by automatically adjusting them based on the detected cuff size. The system transitions from using fixed control parameters to variable control parameters that adapt to different cuff sizes, thereby improving pressure stability across all cuff types while maintaining ease of operation through automated adjustment.
Solution Approach 2:
The system changes the control parameters of the pump based on the detected cuff size. By measuring the actual cuff size and using this information to modify the pump's control parameters, the system achieves optimal pressure control for each specific cuff size, resolving the contradiction between operational simplicity and pressure stability.
2Device complexity
If the pump transfers a fixed volume of inflation fluid, then the control process is simple, but pressure overshoot or undershoot occurs during adjustments
Solution Approach 1:
The system changes the volume of inflation fluid transferred by the pump based on the detected cuff size. Instead of using a fixed volume, the system dynamically adjusts the volume parameter to match the specific cuff size, thereby achieving precise pressure control without overshoot or undershoot while maintaining reasonable control process complexity.
3Ease of manufacture
If control parameters are tuned for average cuff size, then the system is easy to manufacture, but pressure stabilization time increases for other cuff sizes
Solution Approach 1:
The system performs preliminary detection of the cuff size before initiating pressure control. By measuring the actual cuff size in advance and using this information to pre-adjust the pump's control parameters, the system eliminates the need for prolonged stabilization time during operation, while maintaining ease of manufacture through automated detection and adjustment.
Solution Approach 2:
The control parameters are made dynamic and adaptive to the actual cuff size detected during operation. This dynamic adjustment ensures that each cuff size receives optimized control parameters, thereby reducing pressure stabilization time for all cuff sizes while maintaining manufacturing simplicity through automated detection and adaptation.
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 use of variable control parameters based on cuff size improves cuff pressure stability, minimizing overshoot and settling time, and maintaining pressure within a desired range, reducing patient discomfort and ensuring efficient gas delivery.
Implementation Method 1
a pressure sensor that generates pressure data indicative of internal pressure in a cuff
Implementation Method 2
a pump that transfers inflation fluid to or from the cuff
Data Source
AI summary
A cuff inflation controller is provided that includes a pressure sensor that generates pressure data indicative of internal pressure in a cuff and a pump that transfers inflation fluid to or from the cuff. A controller of the cuff inflation controller operates to determine a size of the cuff based on data from the pressure sensor and to set control parameters for the pump based on the determined cuff size.