Ultrafiltration Pump Flow Path Design for Blood Purification
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In existing blood purification apparatuses, the ultrafiltration pump is prone to clogging due to waste products like protein flowing through it during ultrafiltration, leading to difficulty in maintaining accurate volume control over time.
Innovation Solution
The ultrafiltration pump is designed to operate such that it draws dialysate from the dialysate introduction line, reducing the volume of dialysate introduced into the blood purification device, thereby preventing waste liquid from flowing through it, and is synchronized with the liquid-delivering pump to ensure efficient ultrafiltration without dialysate backflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ultrafiltration pump is provided to the bypass line connected to the dialysate drain line, then ultrafiltration can be performed by removing water from blood, but waste liquid containing protein adheres to the pump chamber making it difficult to control ultrafiltration volume over time
Solution Approach 1:
The patent extracts the harmful element (waste liquid) from the ultrafiltration pump's flow path by providing a separate drain line that bypasses the pump. The ultrafiltration pump only handles dialysate introduction, while waste liquid is drained through a dedicated line, preventing protein adhesion and maintaining pump performance over time.
2Object-generated harmful factors
If the ultrafiltration pump draws dialysate from the dialysate introduction line, then waste liquid is prevented from flowing through the pump, but dialysate volume control must be precisely coordinated with the liquid-delivering pump
Solution Approach 1:
The patent uses the dialysate introduction line as an intermediary pathway. The ultrafiltration pump draws dialysate from this line, which serves as a common fluid pathway for both the liquid-delivering pump and ultrafiltration pump. This intermediary approach allows coordinated control while preventing waste liquid contamination.
3Ease of operation
If the ultrafiltration pump operates independently without synchronization, then the system is simpler to operate, but dialysate backflow may occur reducing ultrafiltration efficiency
Solution Approach 1:
The patent implements feedback control through the liquid-delivering pump's liquid delivery amount information. The ultrafiltration pump's operation is controlled based on feedback from the liquid-delivering pump's performance, ensuring coordinated operation that prevents backflow while maintaining efficient ultrafiltration.
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 configuration maintains the performance and accuracy of ultrafiltration over a long period by preventing waste liquid from clogging the ultrafiltration pump and allows for efficient use of dialysate, enabling ultrafiltration without introducing dialysate into the blood purification device.
Implementation Method 1
The ultrafiltration pump is capable of performing ultrafiltration by drawing the dialysate in the dialysate introduction line through the ultrafiltration line
Implementation Method 2
a blood purification apparatus for performing purification treatment and ultrafiltration while causing blood of a patient to extracorporeally circulate
Data Source
AI summary
A blood purification apparatus is provided in which waste liquid is prevented from flowing through an ultrafiltration pump during ultrafiltration so that the performance and accuracy of ultrafiltration can be maintained over a long period. The blood purification apparatus includes an ultrafiltration line one end of which is connected to a dialysate introduction line at a position on a downstream side with respect to a duplex pump. The ultrafiltration line is provided with the ultrafiltration pump. The ultrafiltration pump is capable of performing ultrafiltration by drawing dialysate in the dialysate introduction line through the ultrafiltration line such that the volume of the dialysate to be introduced into a dialyzer becomes smaller than the volume of waste liquid to be drained from the dialyzer.