Peritoneal Dialysis Adequacy Measurement via Flow and Solute Sensors
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Solution Overview
Problem
Current methods for measuring dialysis adequacy in peritoneal dialysis patients are inadequate as they fail to account for variations in clearance, do not provide real-time assessments, and are burdensome and costly, often neglecting the residual renal component and requiring frequent laboratory analyses.
Innovation Solution
A system with flow sensors and uremic solute sensors integrated into the peritoneal dialysis system to calculate dialysis adequacy in real-time, using equations like Kt/V, which includes measurements from the catheter, fluid line, or reservoir, and osmotic agent sensors to estimate membrane transport capability and residual kidney function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If periodic laboratory analysis of dialysate aliquots is used to measure dialysis adequacy, then measurement precision is maintained, but loss of time increases and device complexity increases
Solution Approach 1:
The patent replaces the mechanical/physical process of manual fluid transfer, weighing, and laboratory analysis with electronic sensing and automated calculation. Flow sensors measure dialysate volume electronically, uremic solute sensors measure concentration electronically, and a processor calculates clearance values automatically, eliminating the need for physical fluid handling and laboratory processing.
Solution Approach 2:
The dialysis system performs its own monitoring function by incorporating sensors directly into the dialysis circuit. The system self-measures dialysate volume via flow sensors and solute concentration via uremic solute sensors, then self-calculates clearance values without requiring external laboratory analysis, making the system self-sufficient for adequacy monitoring.
2Measurement precision
If frequent laboratory analyses are performed to capture day-to-day variability, then measurement precision improves, but loss of time increases and device complexity increases
Solution Approach 1:
The patent replaces complex laboratory analysis infrastructure with simple electronic sensors and a processor. Flow sensors and uremic solute sensors provide continuous or frequent measurements without requiring laboratory equipment,技术人员, or complex sample handling procedures, thereby capturing day-to-day variability with minimal system complexity.
Solution Approach 2:
The system enables continuous or frequent monitoring of dialysis adequacy by integrating sensors into the dialysis circuit. Rather than periodic batch analysis, the sensors continuously track dialysate flow and solute concentration, allowing for real-time assessment of clearance and detection of day-to-day variations in dialysis performance.
3Measurement precision
If manual collection and transport of dialysate and urine samples to clinic is required, then measurement precision is maintained, but ease of operation deteriorates
Solution Approach 1:
The dialysis system performs its own monitoring function by incorporating sensors directly into the dialysis circuit. The system self-measures dialysate volume via flow sensors and solute concentration via uremic solute sensors, then self-calculates clearance values without requiring patient action for sample collection or transport.
Solution Approach 2:
The patent replaces the manual process of sample collection, transport, and laboratory analysis with electronic sensing and automated calculation. Flow sensors measure dialysate volume electronically, uremic solute sensors measure concentration electronically, and a processor calculates clearance values automatically, eliminating the need for patient involvement in sample handling.
4Device complexity
If residual renal function is excluded from clearance calculations, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent creates a universal clearance calculation system that can accommodate multiple clearance sources. The processor is programmed to calculate dialysis clearance from sensor data and can also incorporate residual renal clearance measurements when available, providing a total clearance value that reflects all clearance mechanisms without increasing system complexity.
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
Enables real-time or nearly real-time assessment of dialysis adequacy, reduces patient burden and costs by eliminating the need for laboratory analyses, and accurately accounts for residual renal function and daily variability in clearance.
Implementation Method 1
one or more flow sensors in any one or more of the catheter or the fluid line
Implementation Method 2
one or more uremic solute sensors measuring a uremic solute concentration in a peritoneal dialysate removed from the patient
Implementation Method 3
Toxins and metabolic waste products are exchanged between the fluid injected into the peritoneum and the vascularized peritoneal membrane
Implementation Method 4
osmotic agent sensors to estimate membrane transport capability
Data Source
AI summary
The invention relates to devices, systems, and methods for measuring dialysis adequacy in patients undergoing peritoneal dialysis treatment. The devices, systems, and methods use one or more flow sensors and one or more solute sensors to measure the concentration of a uremic solute and volume of the peritoneal dialysate removed from the patient, and to calculate the dialysis adequacy based on the measured peritoneal dialysate concentration and volume.