Dialysis Mixing Apparatus Pressure Control for Reliable Disinfection
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Solution Overview
Problem
Existing mixing apparatuses in dialysis systems face issues where auxiliary liquids can be unintentionally mixed into the main unit due to switching device failures, and pressurizing device malfunctions can damage the switching device or auxiliary flow route.
Innovation Solution
A mixing apparatus with a pressure control unit that manages the pressure between the switching device and pressurizing device in the auxiliary flow route, ensuring it is lower than the main unit when not mixing, and equal to or greater than the main unit when mixing, along with a discharge flow route and detection devices to prevent unintended mixing and damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the switching device is arranged in the auxiliary flow route to enable optional mixing of auxiliary liquid with main liquid, then the mixing function is improved, but the risk of unintentional mixing due to switching device failure increases
Solution Approach 1:
A pressure control unit is introduced as an intermediary component between the auxiliary flow route and the main unit. This pressure control unit actively monitors and regulates pressure differential to prevent unintended mixing, serving as a mediator that enhances reliability without compromising the mixing function controlled by the switching device
Solution Approach 2:
The pressure control unit performs beforehand cushioning by establishing a protective pressure differential barrier before any potential failure can cause unintended mixing. By maintaining pressure in the auxiliary flow route lower than in the main unit during non-mixing states, the system pre-prevents harmful effects of switching device failure
2Productivity
If the pressurizing device operates to inject auxiliary liquid into the main unit, then the disinfecting function is improved, but the risk of damage to switching device or auxiliary flow route due to malfunction increases
Solution Approach 1:
The pressure control unit implements feedback control by continuously monitoring pressure conditions in the auxiliary flow route and adjusting the pressure differential accordingly. This feedback mechanism ensures that pressure builds up in a controlled manner during disinfecting operations, preventing sudden pressure spikes that could damage the switching device or auxiliary flow route
Solution Approach 2:
The pressure control unit provides beforehand cushioning by regulating pressure buildup before it reaches dangerous levels. During pressurizing device operation, the pressure control unit ensures pressure increases gradually and remains within safe limits, protecting the switching device and auxiliary flow route from malfunction-induced damage
Data Source
AI summary
A mixing apparatus which can reliably prevent an auxiliary liquid from being unintentionally mixed into a main unit even when a failure occurs in a switching device, and which can prevent the switching device or an auxiliary flow route from being damaged even when a pressurizing device malfunctions due to the failure. The mixing apparatus includes a pipe circulating dilution water; a pipe circulating a disinfecting solution; a pressurizing pump circulating the disinfecting solution in the pipe toward the pipe; and a check valve capable of optionally turning on and off the pipe. The mixing apparatus further includes a discharge flow route which consists of a flow route branched from between the check valve and the pressurizing pump in the pipe, and which can discharge the dilution water or the disinfecting solution; and an electromagnetic valve which can control the flow route between the check valve and the pressurizing pump in the pipe to have a pressure lower than that of the pipe when not mixing the disinfecting solution with the dilution water.