Fluid Line State Detection for Accurate Peritoneal Dialysis Priming
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Solution Overview
Problem
Existing peritoneal dialysis systems face challenges in accurately calibrating fluid volumes and managing fluid lines, leading to inconsistencies in treatment efficacy and patient comfort.
Innovation Solution
The implementation of a volumetric standard cassette with predefined geometry and a cassette analog for calibration, along with a fluid line state detector using LED illumination to ensure accurate fluid management and detection, enhances the precision of fluid handling in peritoneal dialysis systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional fluid management methods are used in peritoneal dialysis systems, then the system structure remains simple, but fluid volume calibration accuracy deteriorates
Solution Approach 1:
The patent uses a volumetric standard cassette that is a precise geometric copy or analog of the actual fluid handling system. This standard cassette contains predefined geometric features (channels, chambers, reservoirs) that replicate the fluid paths and volumes of the real system, enabling accurate calibration without requiring complex measurement equipment. The copying principle allows the system to transfer known geometric relationships into the calibration artifact, achieving high measurement precision through geometric replication rather than electronic sensing.
Solution Approach 2:
The volumetric standard cassette is pre-manufactured with exact geometric dimensions and fluid path configurations before use. The calibration data is embedded in the physical geometry of the cassette itself, not calculated during operation. This preliminary preparation of precise geometric standards eliminates the need for complex real-time measurement systems, as the calibration information is already encoded in the cassette's physical structure.
2Reliability
If multiple fluid lines are used for comprehensive fluid management, then treatment efficacy improves, but line detection accuracy deteriorates
Solution Approach 1:
The patent employs LED illumination to detect the presence and state of fluid lines. The light source emits light that interacts with the fluid or air in the lines, and sensors detect changes in light properties (absorption, reflection, transmission) to determine line state. This optical detection method allows differentiation between multiple lines and their states (filled, empty, connected, disconnected) based on light property changes rather than complex electrical or mechanical sensing.
Solution Approach 2:
The patent replaces mechanical or electrical detection methods with optical detection using LED illumination. Instead of using mechanical switches, electrical contacts, or complex sensors to detect fluid line states, the system uses light emission and detection. This substitution simplifies the detection mechanism while improving reliability, as optical sensors can non-invasively detect the presence and state of multiple fluid lines simultaneously without physical contact or complex wiring.
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 improves the accuracy of fluid volume calibration and line detection, ensuring consistent and reliable peritoneal dialysis treatments, enhancing patient comfort and treatment efficacy.
Implementation Method 1
A fluid line state detector may include a receptacle configured to retain a fluid line opaque to ultraviolet light, a light sensor, an ultraviolet light emitting LED
Data Source
AI summary
A fluid pumping system may comprise a pump and a fluid line state detector having, a receptacle, at sensor, and an illuminator. The system may further comprise a fluid transfer set including an output line for mating into the receptacle. The system may further comprise a controller in data communication with the fluid line state detector configured to power the illuminator and monitor an output signal of the sensor when the outlet line is in the receptacle to determine a dry tube light intensity value. The controller may be further configured to govern operation of the pump to prime the output line with fluid. The controller may be further configured to power the illuminator, monitor the output signal, and halt operation of the pump when the output signal indicates the light intensity value has dropped below a primed line threshold which is dependent upon the dry tube intensity value.