Dialysis Pump Fluid Volume Control via Sensor Feedback
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Solution Overview
Problem
Conventional dialysis pumps are expensive due to stringent manufacturing tolerances and require regular maintenance, as they need to accurately control fluid volume and are sensitive to environmental changes, making them unreliable and costly to replace.
Innovation Solution
A pumping apparatus with a reservoir, a sensor to determine fluid weight or volume, and a controller to accurately measure and calibrate the amount of fluid pumped, using piezoelectric sensors or other types of sensors to ensure precise fluid delivery, even with varying pump characteristics, and providing alerts for potential faults or aging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If stringent manufacturing tolerances are applied to ensure accurate fluid volume control, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent applies feedback by using a sensor to detect the actual volume of fluid delivered by the pump and comparing it to the target volume. The controller then adjusts pump operation parameters based on this feedback to compensate for manufacturing variations, eliminating the need for stringent manufacturing tolerances while maintaining measurement precision.
Solution Approach 2:
The patent replaces reliance on precise mechanical pump manufacturing with an electronic control system that uses sensors and algorithms to achieve accurate fluid delivery. This substitution of mechanical precision requirements with electronic control reduces device complexity and manufacturing costs.
2Reliability
If high precision pumps are used to maintain reliable fluid delivery, then reliability is improved, but ease of manufacture deteriorates
Solution Approach 1:
The feedback mechanism continuously monitors pump performance and adjusts operation to maintain reliable fluid delivery despite variations in pump characteristics. This allows the use of more easily manufactured pumps with wider tolerance ranges while preserving reliability through active compensation.
Solution Approach 2:
The system performs self-calibration and self-adjustment using the sensor feedback to compensate for pump variations. This self-service capability eliminates the need for complex manufacturing processes and frequent manual calibration, improving ease of manufacture while maintaining reliability.
3Measurement precision
If pump tolerances are made tight to ensure predictable fluid volume, then measurement precision is improved, but ease of repair and maintenance worsen
Solution Approach 1:
The feedback system continuously monitors and compensates for pump performance drift due to wear or environmental changes. This ongoing compensation maintains measurement precision without requiring frequent maintenance or replacement, improving ease of repair by extending pump service life.
Solution Approach 2:
The electronic control system with sensor feedback replaces reliance on mechanically precise pumps that require frequent maintenance. The system compensates for mechanical wear and variations, reducing maintenance frequency and improving ease of repair.
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 solution ensures accurate and reliable fluid delivery in dialysis, reducing the need for frequent calibration and maintenance, while allowing for the detection of pump faults, thus maintaining consistent treatment quality and reducing costs.
Implementation Method 1
a sensor for determining a variation in the amount of the fluid held in the reservoir... The weight variation may be determined by use of a piezoelectric sensor supporting the weight of the fluid and the reservoir
Data Source
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AI summary
In medical apparatus, for example a dialysis machine, a pump is used to move fluid such as purified water or dialysate. The pump performance is monitored by determining the weight or mass of the fluid being pumped. A less expensive pump may be used whilst maintaining an accurate determination of the volume pumped.