Dynamic Pressure Monitoring for Reflux Detection in Fluid Injection
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Solution Overview
Problem
Existing systems for localised fluid injection, particularly in pathological cerebral tissues, fail to detect and prevent reflux effectively due to their reliance on static pressure measurements and lack of dynamic analysis, leading to potential contamination of cerebrospinal fluid and reduced therapeutic efficacy.
Innovation Solution
A system comprising a peristaltic pump, a catheter, and a pressure sensor that measures and analyzes pressure changes over time to detect reflux and automatically adjust the pump operation, allowing for rapid intervention and prevention of reflux by reversing the flow or stopping the pump.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If static pressure measurements and equilibrium state analysis are used, then the system is simpler to implement, but the detection of reflux is delayed and cannot prevent contamination
Solution Approach 1:
The patent transitions from static pressure measurement to dynamic pressure monitoring by analyzing pressure variations throughout the entire pump cycle. The system measures pressure at multiple phases (compression, relaxation, valve operation) to detect reflux patterns, enabling real-time detection while maintaining system simplicity through software-based analysis of existing sensor data.
Solution Approach 2:
The patent implements feedback by continuously monitoring pressure sensor data and using it to detect reflux conditions. The system compares measured pressure variations against expected patterns to identify reflux, providing automatic feedback that triggers alarm signals and enables preventive action before contamination occurs.
2Speed
If manual monitoring by operator is used, then the device complexity is reduced, but the response time to reflux is slow and intervention is delayed
Solution Approach 1:
The system performs self-monitoring by automatically analyzing pressure sensor data to detect reflux conditions. The algorithm independently evaluates pressure variations throughout the pump cycle and triggers alarms without requiring continuous manual observation, enabling rapid automatic detection while maintaining operational simplicity.
3Object-affected harmful factors
If pressure measurement is used a posteriori for monitoring, then the measurement system is simpler, but the injection safety is compromised as reflux cannot be prevented
Solution Approach 1:
The patent enables preliminary detection of reflux by analyzing pressure variations during the pump cycle before contamination can occur. By detecting reflux patterns in real-time through dynamic pressure monitoring, the system can trigger preventive alarms and stop injection before therapeutic liquid contaminates cerebrospinal fluid, shifting from a posteriori monitoring to proactive prevention.
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 system enables quick detection and prevention of reflux, minimizing contamination and ensuring safer, more effective delivery of therapeutic fluids into pathological tissues by dynamically controlling the injection process.
Implementation Method 1
a pressure sensor for measuring the liquid pressure in the catheter
Implementation Method 2
a peristaltic pump, for example a peristaltic micro-pump
Data Source
AI summary
A system for injecting and controlling a flow of liquid to be injected, including: a peristaltic pump; a catheter delivering the liquid to be injected; a pressure sensor measuring liquid pressure in the catheter; a controller receiving data from the pressure sensor and controlling the pump on the basis of the data measured at different times.