3D Valve Actuation for Precise Multi-Valve Dialysis Cassettes
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Solution Overview
Problem
Conventional dialysis systems require complex mechanisms to control multiple valves in dialysis fluid cassettes, leading to increased component count and control algorithm complexity.
Innovation Solution
A valve actuation system comprising a drive unit with an actuator and a positioning frame that allows three-dimensional alignment with valves, enabling rapid and precise control of multiple valves within a dialysis cassette.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional mechanisms are used to control multiple valves, then valve control functionality is achieved, but device complexity increases
Solution Approach 1:
A single actuator is designed to perform multiple functions by sequentially actuating different valves through linear movement and rotation. The actuator can engage with multiple valve stems positioned at different locations, enabling one component to control the entire fluid path rather than requiring separate actuators for each valve.
Solution Approach 2:
Multiple valve control functions are merged into a single integrated actuator mechanism. The actuator combines linear translation along the x-axis, y-axis, and z-axis with rotational capability to sequentially engage and control multiple valves, reducing the overall number of components needed in the system.
2Ease of operation
If multiple dedicated actuators are used for each valve, then precise valve control is achieved, but the number of components increases
Solution Approach 1:
The single actuator is designed with multi-functional capability to replace multiple dedicated actuators. It achieves precise control of each valve through controlled linear movement to specific positions and rotational engagement with valve stems, maintaining operational precision while reducing component quantity.
Solution Approach 2:
The actuator employs dynamic movement along three linear axes (x, y, z) and rotational capability to adaptively engage with different valves at different positions. This dynamic positioning system allows one actuator to precisely control multiple valves that are spatially distributed, replacing the need for fixed, dedicated actuators at each valve location.
3Reliability
If complex control algorithms are used to manage multiple valves, then fluid path management is achieved, but control algorithm complexity increases
Solution Approach 1:
The actuator system incorporates self-positioning capabilities through its linear rails and engagement mechanisms. The actuator automatically positions itself relative to valve stems through mechanical guidance features, reducing the computational burden on control algorithms. The mechanical structure provides inherent positioning feedback that simplifies the control logic needed to manage fluid paths.
4Device complexity
If a single actuator controls multiple valves, then device complexity is reduced, but positioning precision requirements increase
Solution Approach 1:
The actuator utilizes dynamic three-axis linear movement and rotational capability to achieve precise positioning at multiple valve locations. The linear rails provide mechanical guidance that ensures accurate positioning, while the rotational mechanism enables precise engagement with valve stems. This dynamic positioning system allows a single actuator to maintain the required positioning precision across multiple valves without increasing overall system complexity.
Solution Approach 2:
The actuator operates in three-dimensional space with linear movement along x, y, and z axes, adding spatial dimensions to the positioning capability. This multi-dimensional movement allows the actuator to reach multiple valves positioned at different locations and orientations, achieving the required positioning precision through spatial coordination rather than requiring multiple separate actuators.
Data Source
AI summary
In one aspect, a valve actuation system includes a drive unit including an actuator configured to engage and move multiple valves disposed within a fluid cassette to selectively open and close each valve of the multiple valves and a positioning frame disposed adjacent the fluid cassette and along which the drive unit can be moved in three dimensions to align the actuator with a selected valve of the multiple valves.