Dialysis Mode Switching to Prevent Sorbent Cartridge Overload

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Solution Overview

Problem

Sorbent-based dialysis systems face limitations in treating larger or more uremic patients due to sorbent cartridge capacity being exceeded, leading to therapy interruption and challenges in removing sulfate and nitrate ions effectively.

Innovation Solution

A dialysis system with controlled water addition rates to switch between single pass and multi-pass modes, using sensors and a control system to manage sorbent cartridge capacity and optimize water usage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If sorbent-based multi-pass dialysis is used to reduce water volume, then water consumption is reduced, but the sorbent cartridge capacity is exceeded for large or highly uremic patients

Engineering Contradiction:

Improvewater volumeVSAvoidtherapy continuity

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The system dynamically switches between multi-pass and single-pass modes based on real-time monitoring of sorbent cartridge capacity and patient-specific parameters. This dynamic adjustment allows the system to maintain reliable continuous therapy for large or highly uremic patients while optimizing water consumption through multi-pass operation when appropriate.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The invention changes the operational parameter (dialysis mode) from fixed to variable. By controlling the mode of operation between single pass and multi-pass based on patient weight, BUN level, and sorbent capacity, the system adapts to different patient conditions, ensuring therapy continuity while managing water usage efficiently.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If multi-pass mode is used to optimize water usage, then water efficiency is improved, but sorbent cartridge capacity is exceeded leading to therapy interruption

Engineering Contradiction:

Improvewater efficiencyVSAvoidtherapy management

Core Design Contradiction:

ProductivityVSEase of operation

Solution Approach 1:

The control system continuously monitors patient parameters (weight, BUN level) and system state (sorbent cartridge capacity, dialysate flow rate) to determine the appropriate dialysis mode. This feedback mechanism automatically adjusts operation between single-pass and multi-pass modes, maintaining water efficiency while preventing sorbent overload and ensuring seamless therapy management.

Inventive Principle:

Principle #23Feedback

3Reliability

If single pass mode is used to prevent sorbent overload, then therapy continuity is maintained, but water volume requirements increase

Engineering Contradiction:

Improvetherapy continuityVSAvoidwater volume

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

Rather than operating in fixed single-pass mode, the system dynamically transitions between single-pass and multi-pass modes based on real-time conditions. This allows the system to maintain therapy continuity through single-pass when needed while recovering water efficiency by switching to multi-pass mode when sorbent capacity allows, optimizing both reliability and water consumption.

Inventive Principle:

Principle #15Dynamics

4Device complexity

If standard size sorbent cartridges are used for all patients, then device simplicity is maintained, but capacity is insufficient for large or highly uremic patients

Engineering Contradiction:

Improvecartridge standardizationVSAvoidpatient coverage

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The control system provides multi-functionality by enabling standard sorbent cartridges to serve different patient populations through dynamic mode switching. The same standard cartridge can be used for both small/standard patients (in multi-pass mode) and large/highly uremic patients (in single-pass or hybrid mode), making the system universally applicable across diverse patient weights and uremic conditions without requiring multiple cartridge sizes.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 continuous therapy for larger patients by preventing sorbent cartridge overload, reducing water volume requirements, and improving ion removal efficiency.

Implementation Method 1

Sorbent cartridges operate by adsorbing ions and other waste solutes from spent dialysate

Methodology Applied

Scientific EffectAdsorption: Adsorption

Implementation Method 2

urea in the dialysate is catalytically converted to ammonium ions

Methodology Applied

Scientific EffectCatalysis: Catalysis

Implementation Method 3

ammonium ions, which are removed by zirconium phosphate or other cation exchange resin in the sorbent cartridge

Methodology Applied

Scientific EffectIon Exchange: Ion Exchange

Data Source

PatentUS12569601B2Increased operational capabilities of a dialysis system

Publication Date: 2026.03.10 MOZARC MEDICAL US LLC

AI summary

The disclosure relates to systems and methods for increasing the functional capabilities of a sorbent-based dialysis system. The systems and methods allow for the mode of operation of the dialysis system to be switched between single pass mode and a sorbent based multi-pass mode by controlling an amount of water added to the dialysate between 0% to 100% of the dialysate flow rate.