Variable Dialysate Flow Rate for Sorbent Filter Optimization
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Solution Overview
Problem
Current hemodialysis systems are cumbersome, expensive, and difficult to use, especially for home applications, lacking portability and requiring frequent medical supervision due to risks associated with ultrafiltration and reverse ultrafiltration, and they do not efficiently utilize sorbent filters.
Innovation Solution
A portable, user-friendly hemodialysis system with a reusable dialysis machine and disposable dialyzer, incorporating dual reservoirs for continuous dialysate flow, sorbent filters for toxin removal, and advanced sensors and control systems to optimize dialysate flow rates for enhanced toxin removal and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hemodialysis systems use ultrafiltration to remove fluid, then fluid removal efficiency is improved, but patient safety deteriorates due to increased risks
Solution Approach 1:
The system incorporates sensors that continuously monitor dialysate flow rate and ultrafiltration parameters, providing real-time feedback to the control system. This enables dynamic adjustment of flow rates to maintain safe operating conditions while achieving effective fluid removal, resolving the contradiction between productivity and safety.
Solution Approach 2:
The patent implements variable dialysate flow rate capability that allows the system to dynamically adjust operational parameters during treatment. This dynamic control enables the system to optimize fluid removal efficiency while maintaining patient safety through real-time parameter modification based on treatment progress and patient response.
2Ease of operation
If hemodialysis systems are designed for portability, then ease of home use is improved, but device complexity increases
Solution Approach 1:
The system is divided into modular components including a portable dialysis machine, disposable dialyzer, and separate reservoir systems. This segmentation allows the core processing unit to be compact and portable while distributing other functions across simpler, replaceable components, reducing overall device complexity while maintaining portability.
Solution Approach 2:
The patent employs disposable dialyzers and single-use components that eliminate the need for complex cleaning, sterilization, and maintenance systems in the portable unit. This approach significantly reduces device complexity while enabling easy home use, as users simply replace disposable components rather than performing complex maintenance procedures.
3Productivity
If sorbent filters are used for toxin removal, then dialysis effectiveness is improved, but filter life deteriorates due to rapid consumption
Solution Approach 1:
The system varies dialysate flow rate parameters during treatment to optimize sorbent filter utilization. By adjusting flow rates based on treatment phase and toxin load, the system maximizes toxin removal effectiveness while extending filter life through more efficient use of the sorbent material.
Solution Approach 2:
The patent implements periodic or variable flow rate patterns rather than continuous constant flow, allowing the sorbent filter to process toxins in optimized bursts. This periodic action enhances dialysis effectiveness during high-need periods while reducing overall filter consumption and extending filter life.
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 system provides efficient, safe, and cost-effective hemodialysis with improved portability and usability, maximizing sorbent filter life and reducing the need for frequent medical supervision, while ensuring enhanced patient safety through advanced monitoring and control features.
Implementation Method 1
The diffusion entails the migration of molecules by random motion from regions of high concentration to regions of low concentration
Implementation Method 2
convection entails the movement of solute typically in response to a difference in hydrostatic pressure
Implementation Method 3
The fibers forming the semipermeable membrane separate the blood plasma from the dialysate and provide a large surface area for diffusion to take place
Implementation Method 4
a sorbent filter connected to the dialysate flow path for removing toxins that have permeated from the blood plasma through the semipermeable membrane into the dialysate
Data Source
AI summary
A portable hemodialysis system is provided including a dialyzer, a closed loop blood flow path, a closed loop dialysate flow path, a blood pump, and a pair of dialysate pumps. A processor controls the flow of blood through the blood flow path, and the processor controls the flow of dialysate through the dialysate flow path. In addition, the processor stores a preprogrammed patient treatment plan wherein the flow rate of the dialysate through the dialysate flow path reduces throughout the patient's treatment to maximize the amount of urea removed by the sorbent filter. In alternative embodiments, the processor stores a patient treatment plan wherein the dialysate flow rate increases throughout the patient's treatment. In still alternative embodiments, the processor stores a patient treatment plan wherein the flow rate of the dialysate through the dialysate flow path both increases and decreases throughout the patient's treatment.