Dialysis Fluid Mixing Control With Conductivity Recheck
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Solution Overview
Problem
Existing peritoneal dialysis systems lack efficient and automated methods for preparing dialysis fluid at the point of care, necessitating complex setups and potential contamination risks.
Innovation Solution
A system and method for preparing dialysis fluid using a daily sterile disposable fluid circuit, incorporating a controller to manage pinch clamps, peristaltic pumps, and conductivity/temperature sensors to ensure precise mixing and quality control, enabling automated preparation at the point of care.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If automated preparation system is implemented, then productivity and safety are improved, but device complexity increases
Solution Approach 1:
The system is divided into separate functional modules: a controller unit, a pump system with pinch clamps, mixing chambers, and sensor systems. Each module performs a specific function (fluid transfer, mixing, monitoring) and can be independently controlled, allowing automated preparation while maintaining manageable system complexity through modular design.
Solution Approach 2:
The controller is configured to manage multiple functions through a single interface: controlling pinch clamps for fluid flow regulation, operating peristaltic pumps for fluid transfer, and monitoring conductivity/temperature sensors. This multi-functionality automates the preparation process while consolidating control complexity into a centralized unit.
2Device complexity
If manual preparation methods are used, then device complexity is reduced, but contamination risk increases
Solution Approach 1:
The system performs self-monitoring through conductivity and temperature sensors that automatically detect fluid properties during preparation. The controller receives sensor inputs and autonomously adjusts pump speeds, pinch clamp positions, and mixing parameters to maintain sterile conditions, eliminating the need for manual intervention and reducing contamination risk.
Solution Approach 2:
Conductivity and temperature sensors provide real-time feedback to the controller about the medicament preparation status. The controller uses this feedback to automatically adjust the mixing process, ensuring proper concentration and temperature control, which maintains preparation quality and reduces contamination risk without requiring complex manual monitoring procedures.
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
Ensures safe, automated, and precise preparation of dialysis fluid, reducing contamination risks and enhancing the efficiency of peritoneal dialysis processes.
Implementation Method 1
a peristaltic pump 149 to make a batch of diluted concentrate in the mixing container 102
Implementation Method 2
conductivity/temperature sensors to ensure precise mixing and quality control
Implementation Method 3
conductivity/temperature sensors to ensure precise mixing and quality control
Data Source
AI summary
A proportioning device includes a proportioning machine with a temperature-compensating conductivity sensor, a controller, and pump actuator. A fluid circuit is engageable with the pump actuator, has connections for a source of water and one or more medicament concentrates, and includes a mixing container. The controller is configured to mix contents of the mixing container at a first time and to sample fluid from the mixing container, to pass the samples from the mixing container through the temperature-compensating conductivity sensor at different points in time as the fluid flows from the mixing container. The controller is further configured to mix contents of the mixing container a second time if the conductivities differ by a predefined magnitude.