Dialysis Venous Pressure Monitoring for Needle Disconnection Detection
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Solution Overview
Problem
Existing dialysis machines struggle with detecting venous needle disconnections due to static threshold values that trigger false alarms and fail to recognize incremental pressure changes, especially in restless patients, leading to potential life-threatening situations.
Innovation Solution
A monitoring device with a 'restless button' that dynamically sets asymmetric threshold values based on actual pressure, enabling detection of incremental pressure changes and reducing false alarms through a preconfigured venous alarm window.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If static threshold values are used for venous pressure monitoring, then the system is simple to operate, but false alarms are triggered and incremental pressure changes are not detected
Solution Approach 1:
The patent implements dynamic threshold values that automatically adapt to the actual venous pressure during dialysis treatment. The system continuously monitors the actual pressure and adjusts the upper and lower threshold values accordingly, enabling detection of incremental pressure changes without requiring manual reconfiguration. This resolves the contradiction by making the monitoring system both precise and adaptive while maintaining operational simplicity.
Solution Approach 2:
The system changes the threshold parameters dynamically based on the actual venous pressure measurements. By automatically adjusting the threshold values according to the prevailing pressure conditions, the system achieves high detection accuracy for needle disconnections without requiring complex manual setup procedures.
2Measurement precision
If individual threshold values are set during treatment, then measurement precision improves, but ease of operation deteriorates due to increased effort and deeper menu navigation
Solution Approach 1:
The monitoring system performs self-configuration by automatically determining appropriate threshold values based on the actual venous pressure measurements during treatment. This eliminates the need for operators to manually navigate deep menu structures and configure individual thresholds, thereby maintaining high measurement precision while significantly improving ease of operation.
Solution Approach 2:
The system pre-configures the threshold value adjustment logic and automatically applies appropriate thresholds based on real-time pressure conditions. This preliminary setup of the adaptation mechanism ensures both accurate detection and simple operation without requiring manual intervention during critical moments.
3Measurement precision
If asymmetric pressure monitoring is configured in TSM, then measurement precision improves, but ease of operation worsens as it requires technical service intervention
Solution Approach 1:
The system automatically implements asymmetric pressure monitoring with appropriately configured upper and lower thresholds based on actual venous pressure measurements. This eliminates the need for technical service intervention while maintaining high sensitivity to needle disconnections, as the system self-adjusts the asymmetric thresholds during normal operation.
Solution Approach 2:
The asymmetric threshold configuration is made dynamic and automatic, adjusting to actual pressure conditions without requiring manual setup by technical services. This enables continuous sensitive monitoring while keeping the system easy to operate for regular users.
4Ease of operation
If simple alarm acknowledgement is allowed, then ease of operation improves, but reliability deteriorates as the pump restarts and adjusts pressure, potentially missing ongoing disconnections
Solution Approach 1:
The system implements continuous feedback monitoring of venous pressure after alarm acknowledgement and pump restart. By continuously comparing actual pressure against dynamically adjusted thresholds, the system ensures that ongoing disconnections are detected even after the pump resumes operation, thereby maintaining both operational simplicity and monitoring reliability.
Solution Approach 2:
The threshold values dynamically adapt to new pressure conditions after pump restart, ensuring continuous accurate monitoring. This dynamic adjustment maintains reliability by preventing false negatives while allowing simple alarm resolution procedures.
Data Source
AI summary
A monitoring device of a dialysis machine and a method for detecting a venous needle disconnection via venous pressure monitoring based on a threshold value setting. The device includes a button, preferably arranged on a screen of the dialysis machine. The button is configured, upon actuation, to set a lower threshold value and an upper threshold value depending on an actual pressure and to detect an incremental decrease in the venous pressure.