Peritoneal Dialysis Cycler Fluid Volume Control
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Solution Overview
Problem
Current automated peritoneal dialysis systems lack precision in fluid measurement and management, leading to potential overfilling or incomplete drainage, which can result in inadequate treatment efficacy and patient discomfort.
Innovation Solution
A dialysis system with a controller that measures and adjusts infusion and drainage volumes based on calculated residual patient volumes, using a pressure-based volume measurement system to confirm fluid amounts and post alarms for under-drainage, thereby ensuring accurate fluid balance and adjusting treatment protocols accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If automated peritoneal dialysis systems are used, then treatment efficiency is improved, but fluid measurement precision deteriorates
Solution Approach 1:
The system implements a feedback mechanism where the controller continuously monitors drain volume measurements and compares them against expected values. When the measured drain volume falls outside the expected range (infusion volume plus residual volume minus ultrafiltration volume), the controller generates an alarm. This closed-loop feedback ensures measurement precision is maintained throughout the automated treatment process.
Solution Approach 2:
The patent replaces manual mechanical measurement methods with an automated electronic measurement and control system. The controller electronically measures drain volume, calculates expected volumes based on treatment parameters, and automatically compares measurements against expectations, eliminating the imprecision of manual measurement while maintaining treatment efficiency.
2Measurement precision
If fluid measurement precision is improved, then treatment efficacy is enhanced, but device complexity increases
Solution Approach 1:
The controller serves multiple functions: it manages the dialysis treatment protocol, measures infusion volumes, calculates expected drain volumes, measures actual drain volumes, compares measurements against expectations, and generates alarms. By consolidating these functions into a single multi-functional controller, the system achieves high measurement precision without proportionally increasing overall device complexity.
Solution Approach 2:
The system performs self-verification by automatically comparing measured drain volumes against expected volumes calculated from treatment parameters. This self-service measurement verification ensures treatment efficacy is maintained without requiring additional external monitoring equipment or complex manual verification procedures.
3Quantity of substance
If residual patient volume is accurately estimated, then fluid balance is improved, but measurement reliability decreases
Solution Approach 1:
The system performs preliminary measurement of the initial drain volume before the treatment begins. This preliminary action establishes a baseline that is used to calculate the residual patient volume. By measuring the residual volume at the start of treatment rather than attempting to estimate it during treatment, the system improves fluid balance accuracy while maintaining measurement reliability through direct measurement rather than estimation.
Data Source
AI summary
A dialysis system and method is disclosed.