Infusion Pump Occlusion Detection via Pressure Differential Analysis
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Solution Overview
Problem
Current infusion pumps face challenges in accurately detecting occlusions in delivery lines, which can lead to inadequate fluid delivery to patients, due to sensor inaccuracies and high costs associated with disposable cartridges, especially when measuring small signals over long periods.
Innovation Solution
The system measures pressure differentials in the infusion pump over short periods to minimize the effects of long-term systematic changes, using a pressure sensor in the infusion cartridge or pump to compare pressure readings before, during, and after motor operations in basal and bolus delivery modes, generating an alarm if significant differences are detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressure sensors are used to detect occlusions in infusion pumps, then occlusion detection capability is improved, but measurement precision deteriorates due to sensor drift and long-term systematic effects
Solution Approach 1:
The patent uses a pressure sensor to measure pressure in the cartridge interior volume, then copies this measurement approach by taking multiple pressure readings at different time points (before, during, and after motor operation) to create a set of comparative data points. This allows detection of occlusions through differential analysis rather than relying on absolute pressure values, thereby compensating for sensor drift and long-term systematic effects.
2Duration of action of stationary object
If pressure readings are taken over long periods to monitor occlusions, then detection coverage is improved, but measurement precision deteriorates due to sensor drift and ambient pressure changes
Solution Approach 1:
The system performs multiple pressure measurements at different stages of the delivery cycle (before motor operation, during motor operation, after motor operation) and compares these copied measurements to each other rather than to a fixed reference. This differential measurement approach enables long-term monitoring while compensating for sensor drift and ambient pressure changes that would affect absolute readings over time.
Solution Approach 2:
The system continuously monitors pressure at multiple points in the delivery cycle and uses the comparison of these pressure readings to detect occlusion conditions. The feedback mechanism compares pressure before motor operation with pressure after motor operation, and alerts the user when occlusion is detected, enabling continuous monitoring without accumulating measurement errors over time.
3Measurement precision
If expensive pressure sensors are incorporated into disposable cartridges, then occlusion detection accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The patent places a pressure sensor in the pump device rather than in the disposable cartridge, and uses this single sensor to measure pressure in the cartridge interior volume through the sealed environment. This approach copies the measurement capability from a reusable pump component rather than requiring expensive sensors in each disposable cartridge, thereby reducing manufacturing costs while maintaining detection accuracy through the sealed cartridge-pump interface.
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
This approach provides accurate and cost-effective occlusion detection, ensuring safer and more reliable fluid delivery to patients by minimizing sensor drift and ambient pressure changes, thereby reducing the risk of under-delivery or over-delivery of medications.
Implementation Method 1
A pressure sensor located in one of the infusion cartridge and the pump can obtain pressure readings in the interior volume of the cartridge
Data Source
AI summary
Occlusions in a delivery line of an infusion pump can be detected by measuring pressure differentials in the pump over short periods of time in order to minimize the effects of long term systematic sensor changes. In a delivery mode such as basal insulin delivery where a small portion of a volume of fluid is delivered, pressure readings can be obtained before and after the motor move to deliver each portion and compared. The differentials after one or more motor moves can be compared to determine whether an occlusion is present. In a delivery mode such as bolus insulin delivery in which an entire volume of fluid is delivered, pressure differentials can be obtained for consecutive deliveries at a common point in the delivery cycle of each delivery. Comparison of these pressure values can be used to determine whether an occlusion is present.