Piston Head Snap-Fit Cassette Connection for Dialysis
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Solution Overview
Problem
Current medical fluid pumping systems for dialysis, particularly peritoneal dialysis, often require complex and costly vacuum-based connections that can be user-unfriendly, prone to errors, and noisy, with a need for improved mechanical connections that are simpler, more efficient, and reduce deformation during operation.
Innovation Solution
A medical fluid pumping system featuring a piston head that can be mechanically connected and disconnected from a fastening member on a medical fluid cassette using a snap-fit mechanism, allowing for automatic connection and disconnection without manual intervention, reducing the force required and minimizing deformation, thus enhancing pumping accuracy and reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vacuum-based connections are used in medical fluid pumping systems, then pumping capability is achieved, but device complexity and cost increase
Solution Approach 1:
The patent replaces the vacuum-based mechanical connection system with a purely mechanical snap-fit connection system. The piston head directly engages with the fastening member through complementary geometric features (protrusions and recesses), eliminating the need for vacuum generation and maintenance mechanisms while achieving reliable fluid pumping capability.
Solution Approach 2:
The invention extracts and removes the vacuum system components from the medical fluid pumping system, retaining only the essential mechanical connection elements (piston head and fastening member with snap-fit features). This simplification maintains pumping functionality while eliminating the complexity of vacuum-based connections.
2Reliability
If vacuum-based connections are used, then pumping capability is achieved, but ease of operation deteriorates due to user-unfriendly interface
Solution Approach 1:
The snap-fit connection system is designed to automatically engage and lock when the piston head is inserted into the fastening member. The complementary geometric features (protrusions fitting into recesses) self-align and self-secure without requiring user manipulation of vacuum controls or complex alignment procedures, making the connection process intuitive and error-proof.
3Reliability
If vacuum-based connections are used, then pumping capability is achieved, but harmful factors increase due to noise and error-prone operation
Solution Approach 1:
The patent eliminates the vacuum system that generates noise during operation (vacuum pump, valve actuation, pressure changes) and replaces it with a silent mechanical snap-fit connection. The purely mechanical engagement of the piston head with the fastening member produces no operational noise while maintaining reliable pumping capability.
Solution Approach 2:
The cassette with the fastening member appears to be designed as a disposable component that is replaced rather than maintained. This eliminates the need for complex vacuum system maintenance and reduces operational errors associated with vacuum system troubleshooting and repair.
4Ease of operation
If mechanical connection with snap-fit mechanism is used, then ease of operation improves, but manufacturing precision requirements increase
Solution Approach 1:
The connection system is divided into distinct functional segments: the piston head with its engagement features and the fastening member with complementary features. This segmentation allows each component to be manufactured and assembled independently with standard tolerances, then connected through the snap-fit mechanism, reducing the need for high-precision machining of the entire assembly.
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 user-friendly, cost-effective, and quieter operation by simplifying the mechanical connection process, reducing the risk of human errors, and maintaining a tight fit between the piston head and fastening member, thereby improving pumping accuracy and efficiency.
Implementation Method 1
a flexible membrane attached to the base in a manner such that the flexible membrane and the base cooperate to at least partially define a fluid pump chamber
Data Source
AI summary
This disclosure relates to medical fluid pumping systems and related devices and methods. In some aspects, a medical fluid pumping system includes a medical fluid pumping machine including a piston head that can be linearly displaced and a medical fluid cassette that can be secured to the medical fluid pumping machine. The medical fluid cassette includes a fastening member attached to a region of a flexible membrane overlying a fluid pump chamber, and the piston head is configured to be mechanically connected to the fastening member of the cassette.