Adaptive Venous Needle Disconnect Detection in Blood Treatment Machines
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Solution Overview
Problem
Current blood treatment machines face challenges in accurately detecting venous needle disconnections due to interference factors that lead to a high number of false alarms when using pressure-based detection methods, compromising the reliability of venous needle disconnect recognition.
Innovation Solution
A blood treatment machine with a control system that allows for a variable limit value setting for venous needle disconnect detection based on individual patient-specific internal fistula pressure, reducing false alarms without compromising the system's sensitivity by using patient data input or measurement-derived data to determine the optimal limit value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed limit value is used for venous needle disconnect detection, then the detection system is simple to operate, but the reliability of detection deteriorates due to high false alarm rates in patients with high internal fistula pressures
Solution Approach 1:
The patent applies the dynamics principle by transitioning from a static fixed limit value to a dynamic adaptive limit value that automatically adjusts based on the patient's internal fistula pressure. The system measures the actual fistula pressure and calculates an individualized limit value, making the detection threshold dynamic rather than fixed. This resolves the contradiction by improving detection reliability through adaptation to individual patient conditions while maintaining operational simplicity through automation.
Solution Approach 2:
The patent implements parameter changes by modifying the detection limit value parameter based on measured internal fistula pressure. Instead of using a constant threshold, the system varies the limit value parameter according to the specific physiological conditions of each patient. This allows the detection system to adapt to different pressure ranges, reducing false alarms in high-pressure patients while maintaining sensitivity in low-pressure patients, thereby improving overall detection reliability without requiring complex manual configuration.
2Reliability
If a fixed limit value is used for venous needle disconnect detection, then the device complexity is low, but the false alarm rate increases due to interference factors in patients with high internal fistula pressures
Solution Approach 1:
The patent changes the detection parameter (limit value) from a fixed constant to a variable that adapts to the patient's internal fistula pressure. By measuring the actual fistula pressure and calculating an individualized limit value, the system adjusts the detection threshold to match the patient's physiological conditions. This reduces false alarms caused by high internal pressures while maintaining detection sensitivity, directly addressing the harmful effect of false alarms without increasing device complexity.
Solution Approach 2:
The patent implements feedback by using the measured internal fistula pressure to adjust the detection limit value. The system continuously monitors the fistula pressure and uses this information to optimize the detection threshold, creating a closed-loop control system. This feedback mechanism allows the system to adapt to individual patient conditions, reducing false alarms while maintaining high detection accuracy, and eliminates the need for manual parameter adjustment.
3Measurement precision
If pressure-based detection is used, then the detection mechanism is simple, but the measurement precision deteriorates due to interference factors leading to false alarms
Solution Approach 1:
The patent improves measurement precision by changing the detection parameter from a fixed limit value to an adaptive limit value based on measured fistula pressure. This parameter change allows the system to account for individual patient variations in internal pressure, significantly reducing false alarms and improving the precision of disconnect detection. The automation of this process maintains relative system simplicity while dramatically enhancing measurement 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 significantly reduces false alarms in patients with high internal fistula pressures while maintaining reliable detection, ensuring patient safety by adapting the limit value to each patient's unique conditions, thus enhancing treatment efficiency and reliability.
Implementation Method 1
having a pressure sensor for detecting the pressure in the venous line
Data Source
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AI summary
The present invention relates to a blood treatment machine having a control, having a pump actuator for pumping blood through an extracorporeal blood circuit which comprises an arterial line and a venous line, and having a pressure sensor for detecting the pressure in the venous line, wherein the control has a detection function for detecting a venous needle disconnect which compares a value determined on the basis of the pressure in the venous line with a limit value to recognize a venous needle disconnect, wherein the limit value with which the detection function compares the value determined on the basis of the pressure in the venous line can be set variably and/or is set variably by the control.