Adaptive Filter Fluid Pump for Motor Pressure Separation
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Solution Overview
Problem
Fluid pumps, such as infusion pumps, face challenges in accurately adjusting fluid delivery due to fluctuations in pressure caused by patient movement or other sources, leading to unintended bolus, under-delivery, and cessation of fluid, which existing sensors and detection methods struggle to address effectively, especially at low flow rates.
Innovation Solution
Incorporating an adaptive filter to separate contributors to fluid pressure, such as pump motor and patient movement, by predicting and removing motor pressure from sensor readings, allowing for more accurate adjustment of pump settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If direct flow-rate measurements are used to measure fluid pressure, then the fluid pressure can be detected, but the measurements are unreliable and inaccurate especially at low flow rates
Solution Approach 1:
The patent introduces an adaptive filter as an intermediary processing layer between the pressure sensor and the control system. The filter processes the raw pressure measurements by separating the signal into components attributable to pump motor pressure and patient pressure, thereby improving measurement accuracy and reliability without requiring additional sensors or changing the physical measurement approach
Solution Approach 2:
The patent replaces direct mechanical flow-rate measurement with an electronic signal processing approach. Instead of relying on mechanical sensors to directly measure pressure accurately, the system uses electronic filtering and signal separation algorithms to derive accurate pressure information from noisy measurements, substituting mechanical measurement reliability with electronic processing accuracy
2Measurement precision
If sensors are used to measure fluid pressure, then fluid pressure can be monitored, but a significant amount of device resources (power, processing time, memory) are required
Solution Approach 1:
The patent applies partial action by using a simplified adaptive filter model that processes only the essential information needed for pressure separation. Rather than using complex multi-sensor systems or high-power processing, the filter uses a streamlined algorithm that consumes minimal device resources while still achieving accurate pressure monitoring and separation of motor and patient pressure components
3Productivity
If the pump motor contributes to fluid pressure, then the pump can deliver fluid, but the motor pressure cannot be distinguished from patient pressure fluctuations
Solution Approach 1:
The patent segments the fluid pressure signal into distinct components: motor pressure and patient pressure. By using the adaptive filter to separate these overlapping signals, the system loses no information about either pressure source while maintaining the ability to distinguish between them, enabling accurate monitoring of patient pressure fluctuations independent of motor operation
Solution Approach 2:
The adaptive filter uses feedback from the motor current measurements to continuously refine its separation of motor pressure and patient pressure. The filter adjusts its processing based on the relationship between motor operation and pressure readings, enabling accurate real-time differentiation of pressure sources without requiring additional sensors or complex processing
Data Source
AI summary
A method includes measuring a fluid pressure of fluid in a fluid supply line of an infusion pump. The fluid pressure includes a motor pressure and a patient pressure. The method also includes determining the patient pressure. The determining includes removing, by an adaptive filter, to remove the motor pressure from the measured fluid pressure. The removing includes generating a predicted motor pressure based on the current of the motor, generating an error signal based on a comparison between the predicted motor pressure and the measured fluid pressure, and removing the motor pressure from the measured fluid pressure when an error value indicative of the error signal is less than an error threshold. The method also includes adjusting, based on the patient pressure, a setting of the infusion pump. Related methods and articles of manufacture, including apparatuses and computer program products, are also disclosed.