Fluid Injector Occlusion Detection Using Compliance Volume Feedback
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Solution Overview
Problem
Conventional fluid injector systems rely solely on pressure monitoring to detect occlusions, leading to overestimation of flow rate reduction and potential motor wear, and inadequate iodine delivery during medical procedures.
Innovation Solution
A fluid injector system with a control device that calculates compliance volume changes and pressure differentials to detect occlusions, adjusting the delivery rate to maintain the predetermined flow rate and prevent pressure limits from being exceeded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional pressure monitoring alone is used to detect occlusions, then the system can detect pressure increases, but the occlusion location is subjected to much higher pressures than desired before the pressure limit is reached
Solution Approach 1:
The system calculates compliance volume changes continuously during the injection procedure to detect occlusions before pressure reaches dangerous levels. By monitoring the relationship between injected volume and pressure differential in real-time, the system identifies occlusions proactively rather than reactively, preventing excessive pressure exposure at the occlusion site.
Solution Approach 2:
The compliance volume calculation serves as an intermediary parameter that bridges the gap between injection parameters and pressure effects. By introducing this intermediate measurement that accounts for system compliance, the system can detect occlusions more accurately without subjecting the occlusion site to harmful pressure levels.
2Stress or pressure
If the fluid flow rate is stepped down when a predetermined pressure limit is reached, then system pressure is reduced, but the needed reduction in flow rate is often overestimated resulting in frequent motor speed changes and possibly impacting iodine delivery rate
Solution Approach 1:
The system uses real-time feedback from compliance volume calculations to dynamically adjust flow rate reductions. By continuously monitoring the relationship between injected volume, pressure differential, and time, the system determines the actual flow rate reduction needed rather than applying fixed percentage reductions, thereby avoiding overestimation and unnecessary motor speed changes.
Solution Approach 2:
The system dynamically adjusts the flow rate reduction based on real-time compliance volume measurements rather than using static predetermined reductions. This dynamic approach allows the system to optimize motor speed changes and maintain reliable iodine delivery rates while still controlling system pressure effectively.
3Measurement precision
If pressure monitoring alone is used to monitor occlusions, then the system can detect when a predetermined pressure limit is reached, but frequent motor speed changes occur reducing motor life
Solution Approach 1:
The system implements continuous feedback monitoring of compliance volume changes during the injection procedure. By analyzing the relationship between injected volume, pressure differential, and time in real-time, the system detects occlusions more efficiently and makes more accurate flow rate adjustments, reducing the frequency of motor speed changes and extending motor life.
Data Source
AI summary
A system, method, and computer program product are disclosed for occlusion detection and/or pressure limiting in a fluid injector system. A fluid injector system may include at least one fluid injector device, one or more drive components, and a control device. The control device may comprise at least one processor programmed or configured to: provide instructions to the fluid injector system to deliver fluid from the at least one fluid injector device at a predetermined fluid flow rate, determine a first fluid pressure measurement within the at least one fluid injector device at a first time, determine a second fluid pressure measurement within the at least one fluid injector at a second time, determine a pressure differential between the first fluid pressure measurement and the second fluid pressure measurement, calculate a change in compliance volume of the at least one fluid injector device based on the determined pressure differential, compare the calculated change in compliance volume with the predetermined fluid flow rate, repeat the steps throughout the fluid injection procedure, and determine whether an occlusion or a partial occlusion has occurred downstream of the at least one fluid injector device.