Pumping Cassette Pressure Control for Automated Dialysate Mixing
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Solution Overview
Problem
Conventional peritoneal dialysis solutions are bulky, difficult to handle, and their production cannot keep pace with the growing demand, leading to potential shortages and increased waste due to the need for manual mixing, which affects patient convenience and supply availability.
Innovation Solution
A cassette-based fluid pumping system with a pumping cassette, flexible membranes, and a control surface that uses positive and negative pressure sources to precisely control fluid transfer, allowing for automated mixing and delivery of dialysate, reducing the need for large bags and enabling efficient production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional peritoneal dialysis solutions are used, then dialysis therapy can be provided, but the solutions are bulky and difficult to handle
Solution Approach 1:
The patent divides the dialysis solution into multiple concentrated compartments that are stored separately and mixed in vivo. Instead of storing large volumes of pre-mixed dilute solution, the system stores smaller volumes of concentrated solution in separate compartments, reducing the bulk and handling difficulty while maintaining the required dialysis function.
Solution Approach 2:
The patent changes the concentration parameter of the dialysis solution by storing it in a concentrated state and diluting it in vivo through mixing with body fluids. This parameter change allows for more compact storage while achieving the same therapeutic effect, directly addressing the bulk and handling issues.
2Reliability
If compartmented dialysate solutions requiring manual manipulation are used, then physiological biocompatibility is improved, but mixing variability and set-up burden increase
Solution Approach 1:
The patent enables the dialysis system to automatically mix the concentrated compartments in vivo without requiring manual manipulation by the patient. The mixing is achieved through the body's natural movements and fluid dynamics, eliminating the set-up burden while maintaining the physiological biocompatibility of compartmented solutions.
Solution Approach 2:
The patent replaces the mechanical mixing system (manual manipulation of compartments) with a physiological mixing system that utilizes body movements and fluid dynamics. This substitution eliminates the need for patient intervention in the mixing process while preserving the benefits of compartmented solutions.
3Productivity
If production capacity is expanded to meet growing demand, then supply availability improves, but manufacturing time and complexity increase
Solution Approach 1:
The patent segments the dialysis solution manufacturing into multiple concentrated compartments that can be produced separately and then combined. This segmentation allows for simpler, more scalable production of each compartment while maintaining the overall therapeutic effect, reducing manufacturing complexity as demand grows.
Solution Approach 2:
The patent changes the concentration parameter of the manufactured solution, producing highly concentrated compartments that require smaller volumes and simpler packaging. This parameter change reduces the complexity of production and distribution while meeting growing demand, as less material needs to be manufactured, stored, and handled.
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 system provides a compact, efficient, and reliable method for preparing and delivering dialysate, minimizing waste and setup burden while ensuring consistent mixing, thus addressing production capacity issues and patient convenience.
Implementation Method 1
a pneumatic pressure distribution assembly to precisely manage fluid volumes and pressures
Implementation Method 2
positive and negative pressure source and a number of pneumatic valves
Implementation Method 3
pumping cassette having a first side including number of valve wells and second side having a fluid bus
Data Source
AI summary
A system including a pumping cassette having a first side including number of valve wells and second side having a fluid bus. Each side may be covered by a flexible membrane. A control surface having a number of valve well control stations actuatable with respect to the flexible membrane covering the first side of the cassette to open and close the valve wells when the cassette is mated against the control surface may be included. A pressure distribution assembly having a positive and negative pressure source and a number of pneumatic valves may be included. A controller configured to selectively actuate the number of pneumatic valves to apply pressure against the valve well control stations in a valve pumping sequence until a volume displaced through the fluid bus of the pumping cassette from a source to a destination is within a range of a target volume may be included.