Sorbent Cartridge Fluid Circuits for Dialysis Monitoring
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for monitoring urea clearance and dialysis adequacy in patients with end-stage renal disease are inadequate, as they rely on infrequent blood tests and cannot accurately assess urea clearance efficiency during dialysis sessions, leading to potential morbidity and mortality due to insufficient or excessive dialysis.
Innovation Solution
A sorbent regeneration system with multiple material layers, including urease-containing materials, alumina, zirconium phosphate, and activated carbon, is used to measure fluid characteristics such as conductivity and ammonium ion concentration in dialysate, allowing for continuous monitoring of urea clearance and dialysis efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If infrequent blood tests are used to monitor urea clearance, then testing cost is reduced, but measurement reliability deteriorates leading to potential morbidity and mortality
Solution Approach 1:
The patent replaces the mechanical/blood sampling system with an optical sensing system. Sensors detect urea concentration in dialysate fluid optically, eliminating the need for blood draws and laboratory analysis. This substitution enables continuous real-time monitoring without the time delays and costs associated with traditional blood test methods.
Solution Approach 2:
The patent uses dialysate fluid as an intermediary to indirectly measure urea clearance. Instead of measuring urea directly in blood, the system measures urea concentration in the dialysate that has contacted the patient's blood in the dialyzer. This intermediary approach provides continuous monitoring data without requiring direct blood sampling.
2Measurement precision
If continuous monitoring of urea clearance is implemented, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent makes the dialysate fluid serve multiple functions: it performs its primary dialysis function of removing waste from blood, and simultaneously serves as the medium for continuous urea concentration monitoring. The same fluid pathway is used for both treatment and measurement, eliminating the need for separate monitoring equipment and reducing overall system complexity.
Solution Approach 2:
The patent merges the dialysis treatment function with the monitoring function into a single integrated system. The sensors are placed within the existing dialysate flow path, combining the therapeutic dialysis process with the diagnostic monitoring process. This integration reduces device complexity by eliminating separate blood sampling and laboratory analysis systems.
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 system enables real-time monitoring of urea clearance and dialysis efficiency, providing immediate feedback to adjust treatment duration and intensity, thereby improving patient outcomes by ensuring adequate dialysis and reducing the risk of under or over-dialysis.
Implementation Method 1
a first material layer comprising a urease-containing material
Implementation Method 2
a second material layer comprising alumina, zirconium phosphate, or zirconium oxide; a third material layer comprising activated carbon
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A system for measuring at least one fluid characteristic at various stages within a sorbent system has a sorbent cartridge that has at least one material layer and at least one fluid passageway in at least one location in the sorbent system to provide a diverted sample stream from the various stages. At least one fluid characteristic of the diverted sample stream is measured.