Vibration-Aided Air Separation in Dialysis Cassette
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Solution Overview
Problem
Dialysis systems face challenges in removing entrained air and gases from dialysis fluids and blood, which can reduce treatment effectiveness and pose safety risks, particularly in hemodialysis and peritoneal dialysis, where air accumulation can lead to discomfort or severe consequences.
Innovation Solution
The development of a dialysis cassette with an integrated air separation chamber that utilizes buoyancy forces, baffles, and optional ultrasonic vibration to effectively remove air from dialysis fluids and blood, ensuring safe delivery to patients by venting air to atmosphere or a holding vessel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dialysis systems use conventional air removal methods, then the system structure remains simple, but air removal effectiveness is insufficient and treatment safety is compromised
Solution Approach 1:
The dialysis system is segmented into multiple functional chambers including a first chamber for air removal and a second chamber for fluid processing. This segmentation allows dedicated air removal functionality while maintaining overall system organization and managing complexity through modular design.
Solution Approach 2:
An intermediary air removal mechanism is introduced between the fluid source and the patient delivery system. This intermediary component actively removes air bubbles from the dialysis fluid, preventing air embolism and improving treatment safety without requiring complete system redesign.
2Object-affected harmful factors
If dialysis systems increase air removal effectiveness, then treatment safety improves, but the device complexity increases
Solution Approach 1:
Mechanical vibration is applied to the air removal chamber to enhance the separation of air bubbles from dialysis fluid. The vibration disrupts air bubble coalescence and promotes their removal through dedicated outlets, significantly improving air removal effectiveness through a relatively simple mechanical addition.
Solution Approach 2:
The system changes physical parameters such as vibration frequency and chamber pressure to optimize air removal effectiveness. By adjusting these parameters, the system achieves superior air removal performance without requiring complex mechanical structures, maintaining a balance between effectiveness and simplicity.
3Device complexity
If dialysis systems use simple air removal structures, then device complexity remains low, but air removal completeness is insufficient
Solution Approach 1:
Air is extracted from the dialysis fluid through dedicated air removal outlets in the first chamber, separating the air removal function from the main fluid processing path. This extraction approach ensures complete air removal while maintaining simple fluid delivery structures, as air is removed at the source rather than requiring complex filtration throughout the system.
Solution Approach 2:
Air removal is performed as a preliminary action before fluid delivery to the patient. The system removes air bubbles from the dialysis fluid in advance through the first chamber, ensuring that only air-free fluid reaches the patient. This preliminary air removal maintains simple downstream structures while achieving complete air elimination.
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 significantly enhances air removal from dialysis fluids and blood, improving treatment efficacy and safety by ensuring that air is eliminated before delivery, thereby maintaining the effectiveness of dialysis processes and preventing adverse reactions.
Implementation Method 1
The air separation chamber is configured with respect to the other components of the disposable cassette such that when the cassette is loaded into the dialysis instrument, the fluid inlet and fluid outlet are located towards a bottom or bottom wall of the air separation chamber, while the air outlet is located at or near the top of the dialysis instrument. Such configuration allows buoyancy forces to lift air bubbles from the dialysis fluid to the top of the air separation chamber for venting.
Implementation Method 2
The vibrator is positioned within the dialysis instrument to contact the disposable cassette at the air separation chamber. The vibrator provides a force in addition to buoyancy to separate air from the fluid, forming an air separation area.
Data Source
AI summary
A dialysis system includes a dialysis fluid disposable configured to hold and transport a dialysis fluid; an air separation chamber in fluid communication with the dialysis fluid disposable; and a dialysis instrument operable to pump dialysis fluid through the dialysis fluid disposable, the instrument including a vibrator configured to vibrate the air separation chamber to separate air from the dialysis fluid traveling through the chamber.