Cassette Frame Locking Structure for Secure Blood Purification Attachment
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Solution Overview
Problem
Existing blood purification devices face issues with the cassette frame coming off during use, necessitating a more secure attachment mechanism.
Innovation Solution
A blood purification device with a cassette frame attachment part that includes locking portions and a pressing portion, where the cassette frame has a locking hole and a pressure-receiving portion with an inclined surface to convert the pressing force into an opposite direction, preventing the cassette frame from coming off during use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking portion locks the cassette frame from the front surface side, then the cassette frame is secured against detachment, but the cassette frame may still come off during use due to insufficient pressing force from the back surface side
Solution Approach 1:
The attachment mechanism is segmented into two distinct functional components: a locking portion that locks the cassette frame from the front surface side, and a pressing portion that presses the cassette frame from the back surface side. This segmentation allows each component to perform its specific function effectively, with the locking portion providing anti-detachment security and the pressing portion providing additional holding force, thereby resolving the contradiction between attachment security and mechanism complexity.
Solution Approach 2:
The pressing portion acts from the back surface side, which is a different dimension relative to the front surface side where the locking portion operates. This multi-dimensional approach to attachment (front surface locking + back surface pressing) enhances the overall security of the cassette frame attachment without requiring excessive complexity in a single plane.
2Reliability
If a pressing portion presses the cassette frame from the back surface side, then the attachment security is improved, but the structure becomes more complex
Solution Approach 1:
The locking portion and pressing portion are merged into a single integrated attachment mechanism that operates together as a unified system. The locking portion and pressing portion work in conjunction, with the locking portion engaging the cassette frame from the front and the pressing portion applying force from the back, creating a combined effect that enhances attachment security while maintaining reasonable structural simplicity.
Solution Approach 2:
The pressing portion is designed to automatically press the cassette frame when the locking portion engages, utilizing the mechanical interaction between the locking protrusion and the inclined surface. This self-service mechanism reduces the need for additional complex actuation systems, as the pressing action is generated inherently by the locking engagement process itself.
3Reliability
If an inclined surface converts pressing force into opposite direction force, then the cassette frame is prevented from coming off, but the manufacturing precision requirements increase
Solution Approach 1:
The inclined surface is designed with specific geometric parameters (angle, length, and curvature) that optimize the force conversion efficiency while accommodating normal manufacturing tolerances. By carefully selecting these parameters, the design achieves reliable force direction conversion without requiring extremely tight manufacturing precision, thus resolving the contradiction between attachment security and manufacturing precision requirements.
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 cassette frame is securely attached, reducing the likelihood of unintentional detachment during use and facilitating easy detachment when not in use, while maintaining a simple device configuration.
Implementation Method 1
one of the pressing portion and the pressure-receiving portion comprises an inclined surface that comes into contact with the other of the pressing portion and pressure-receiving portion and converts a part of a pressing force from the pressing portion into a force in an opposite direction to a direction a locking protrusion of the locking portion faces
Data Source
AI summary
A blood purification device includes a cassette frame and a cassette frame attachment part to which the cassette frame is removably attached. The cassette frame attachment part includes a locking portion that locks the cassette frame from the front surface side, and a pressing portion that presses the cassette frame from the back surface side. The cassette frame includes a locking hole through which the locking portion passes, and a pressure-receiving portion that receives pressure from the pressing portion. One of the pressing portion and the pressure-receiving portion includes an inclined surface that comes into contact with the other of the pressing portion and pressure-receiving portion and converts a part of a pressing force from the pressing portion into a force in an opposite direction to a direction a locking protrusion of the locking portion faces, thereby moving the cassette frame in the opposite direction.