Dialysis Fluid Pump Cam Mechanism Pulsating Flow
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Hemodialysis efficiency is limited by the need for a pressure difference between blood and dialysis fluid, which requires increasing the size of the hemodialysis filter and consumption of more dialysis membranes, rather than enhancing efficiency without enlarging the filter.
Innovation Solution
A dialysis fluid pump with a cam-driven mechanism that generates pulsating flow by using flexible tubes and pressure members to increase the pressure difference between blood and dialysis fluid, allowing for enhanced mass transfer without enlarging the filter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the path where blood and dialysis fluid meet is lengthened to enhance hemodialysis efficiency, then mass transfer efficiency is improved, but the size of the hemodialysis filter and consumption of dialysis membranes increase
Solution Approach 1:
The patent applies periodic action by generating pulsating flow of dialysis fluid through a cam mechanism with lifting portions that periodically press against the flexible tube. This creates cyclic pressure variations that enhance mass transfer efficiency without requiring a larger filter, thereby resolving the contradiction between improving hemodialysis efficiency and increasing filter size
Solution Approach 2:
The patent changes the flow regime parameter from continuous laminar flow to pulsating flow by introducing periodic pressure variations. This parameter change enhances the driving force for mass transfer across the dialysis membrane, improving hemodialysis efficiency without increasing the physical dimensions of the filter
2Productivity
If the path where blood and dialysis fluid meet is lengthened to enhance hemodialysis efficiency, then mass transfer efficiency is improved, but consumption of dialysis membranes increases
Solution Approach 1:
The cam mechanism generates periodic pulsations in the dialysis fluid flow, creating cyclic pressure gradients that enhance waste matter removal across the dialysis membrane. This improves hemodialysis efficiency without requiring increased membrane surface area, thus reducing dialysis membrane consumption
Solution Approach 2:
By transforming continuous flow into pulsating flow, the patent changes the mass transfer parameters to achieve higher efficiency. This allows effective waste removal with smaller membrane surface area, reducing the consumption of dialysis membranes
3Stress or pressure
If pulsating flow is generated by cam mechanism with multiple pressure members, then pressure difference between blood and dialysis fluid is increased, but device complexity increases
Solution Approach 1:
The cam mechanism is segmented into multiple lifting portions (first, second, third lifting portions) that act on different sections of the flexible tube. This segmentation allows generation of controlled pressure differences at different locations and times, enhancing mass transfer efficiency while maintaining a relatively simple overall structure
Solution Approach 2:
The patent employs dynamic elements including a rotating cam mechanism and flexible tubes that respond to periodic pressing forces. This dynamic approach generates time-varying pressure differences that enhance mass transfer, while the mechanical simplicity of the cam-follower arrangement keeps device complexity manageable
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 solution increases the magnitude and frequency of pressure differences, thereby enhancing hemodialysis efficiency by generating pulsating flow of dialysis fluid to the hemodialysis filter, improving waste removal and electrolyte balance without requiring larger filters or more membranes.
Implementation Method 1
A dialysis fluid pump with a cam-driven mechanism that generates pulsating flow by using flexible tubes and pressure members to increase the pressure difference between blood and dialysis fluid
Implementation Method 2
increase the magnitude and frequency of pressure differences, thereby enhancing hemodialysis efficiency by generating pulsating flow of dialysis fluid
Implementation Method 3
The dialysis fluid supply tube is formed of a flexible material that can be contracted and relaxed, and one end of the dialysis fluid supply tube is connected to the dialysis fluid supply tank and the other end is connected to the hemodialysis filter
Implementation Method 4
a hemodialysis filter that is equipped with a dialysis membrane within a single housing to enable mass transfer through the dialysis membrane between blood and dialysis fluid
Data Source
AI summary
According to the present invention, a dialysis fluid pump comprises: a housing having an accommodating space formed therein; a dialysis fluid supply tube and a dialysis fluid recovery tube, at least a portion of each of which is accommodated in the accommodating space; a cam rotatably installed in the accommodating space; a motor for rotating the cam; and a first backflow pressure preventer and a second backflow pressure preventer adapted to be mobile in the accommodating space and be pushed by the cam. The dialysis fluid supply tube is made of a flexible material which can be contracted or relaxed, and one end thereof is connected to a dialysis fluid supply tank and the other end thereof is connected to a hemodialysis filter. The dialysis fluid recovery tube is made of a flexible material which can be contracted or relaxed, and one end thereof is connected to a dialysis fluid recovery tank and the other end thereof connected to the hemodialysis filter. The cam has a cam surface for pressing the dialysis fluid supply tube and recovery tube to discharge the dialysis fluid from the inside of the dialyzing fluid supply tube and of the dialyzing fluid recovery tube. The first backflow pressure preventer and the second backflow pressure preventer prevent the dialysis fluid from flowing backward through the dialysis fluid supply tube and the dialysis fluid recovery tube.