Disposable Hemodialysis Cartridge with Integrated Actuation
Solution Overview
Problem
Current hemodialysis machines are complex, costly, and prone to failure, with increased maintenance needs and risks of incorrect line installation and cross-infection, particularly in home dialysis settings.
Innovation Solution
A disposable cartridge for hemodialysis machines featuring a blood flowpath and a dialysate flowpath with integrated mixing pumps, three-way valves, and deformable membranes for actuation, ensuring accurate dialysate composition and minimizing machine complexity, while reducing the risk of infection and improving installation precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If complex fluid paths with multiple pumping and valving components are used to achieve accurate dialysate composition control, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple pumping and valving components into a single integrated disposable cartridge assembly. The cartridge integrates the dialysate mixing chamber, blood dialysis chamber, and all necessary fluid control mechanisms into one unified device, eliminating the need for separate pumps and valves on the main machine while maintaining accurate dialysate composition control.
Solution Approach 2:
The patent segments the dialysis system into a reusable main machine and a disposable cartridge. The complex fluid control functions are isolated to the disposable cartridge, which can be discarded after a single use, thereby reducing the complexity and maintenance requirements of the permanent machine while preserving manufacturing precision in the dialysate composition control.
2Manufacturing precision
If multiple pumping and valving components are provided on the dialysis machine, then dialysate composition control is improved, but reliability decreases
Solution Approach 1:
The patent employs a disposable cartridge that contains all pumping and valving components needed for dialysate composition control. This single-use cartridge is discarded after one treatment, eliminating the risk of component failure from repeated use and reducing the reliability concerns associated with having multiple mechanical components in the permanent machine.
Solution Approach 2:
The patent extracts all pumping and valving components from the permanent dialysis machine and relocates them to the disposable cartridge. This extraction removes potential failure points from the main machine, improving its reliability while still enabling precise dialysate composition control through the cartridge's integrated components.
3Manufacturing precision
If blood and dialysate solution lines require careful mounting before treatment, then manufacturing precision is improved, but ease of operation deteriorates
Solution Approach 1:
The patent combines the blood line and dialysate solution line connections into a single integrated cartridge assembly with pre-configured connection points. The cartridge is designed to be inserted into the machine as one unit with all connections pre-established, eliminating the need for separate careful mounting of individual lines while maintaining installation precision.
Solution Approach 2:
The patent performs preliminary action by pre-assembling and pre-connecting all fluid lines and components within the disposable cartridge before it reaches the patient. The cartridge arrives ready-to-use with all connections pre-established, eliminating the need for complex installation procedures at the point of use and making the operation simpler for healthcare providers.
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 cartridge simplifies dialysate composition control, reduces machine complexity, and minimizes the risk of infection and incorrect line installation, enhancing the reliability and safety of hemodialysis treatments.
Implementation Method 1
The action of dialysis across the membrane is achieved primarily by a combination of diffusion (the migration of molecules by random motion from a region of higher concentration to a region of lower concentration)
Implementation Method 2
and convection (solute movement that results from bulk movement of solvent, usually in response to differences in hydrostatic pressure)
Implementation Method 3
The cartridge has a deformable membrane which may be deformed by the dialysis machine to actuate valves and pumps on the cartridge
Data Source
AI summary
A disposable cartridge for use in a hemodialysis machine has a blood flow path for carrying a volume of blood to be treated in a dialyser and a dialysate flow path, isolated from the blood flow path, for delivering a flow of dialysate solution through the dialyser. The cartridge is received in an engine section of the machine. The engine section has first and second platens which close when the cartridge is inserted to retain the cartridge. Actuators and sensors arranged on the second platen control operation of the cartridge.