Umbilicus Bearing Traction Features to Prevent Relative Rotation
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Solution Overview
Problem
Blood processing systems face challenges in maintaining the sterile and sealed integrity during centrifugation, particularly in preventing relative rotation between components, which can lead to contamination and reduce the longevity of hardware.
Innovation Solution
A one-piece bearing with traction features is secured to the umbilicus, featuring a plurality of tabs disposed about the axis of rotation, which engage the umbilicus at specific compression locations to prevent relative rotation, utilizing thermoplastic elastomer material for the umbilicus to maintain sterility and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bearing is used to support the umbilicus during centrifugation, then the sterile integrity and密封性 are maintained, but relative rotation between the bearing and umbilicus can occur leading to contamination and reduced hardware longevity
Solution Approach 1:
The bearing incorporates traction features (protrusions or ridges) at specific locations on its inner surface that create localized engagement points with the umbilicus. These localized traction features prevent relative rotation at critical areas while maintaining the overall rotational freedom needed for centrifugation operation.
Solution Approach 2:
The traction features are designed with asymmetric geometries that provide differential engagement with the umbilicus surface. This asymmetric design creates directional friction forces that effectively prevent relative rotation between the bearing and umbilicus during the centrifugation process.
2Ease of operation
If traditional bearing designs are used, then rotation is permitted, but relative rotation occurs reducing component lifespan
Solution Approach 1:
The bearing incorporates traction features (protrusions or ridges) at specific locations on its inner surface that create localized engagement points with the umbilicus. These localized traction features prevent relative rotation at critical areas while maintaining the overall rotational freedom needed for centrifugation operation.
Solution Approach 2:
The traction features are designed with asymmetric geometries that provide differential engagement with the umbilicus surface. This asymmetric design creates directional friction forces that effectively prevent relative rotation between the bearing and umbilicus during the centrifugation process.
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
This solution effectively maintains the sterile integrity of the fluid processing assembly by preventing relative rotation and extending the lifespan of components, ensuring efficient and contamination-free blood processing.
Implementation Method 1
a plurality of traction features, which bear against the umbilicus to prevent relative rotation of the bearing and the umbilicus
Data Source
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AI summary
A fluid circuit for use with a fluid processing assembly, the fluid circuit comprising an umbilicus having a first end, a second end, an axis of rotation, and a cross-sectional circumference; a one-piece bearing secured to the umbilicus at a location between the first and second ends, the bearing having an axis of rotation and including an inner lumen which directly engages the umbilicus and includes a plurality of traction features (156a, 156b), which bear against the umbilicus to prevent relative rotation of the bearing and the umbilicus; and the plurality of traction features comprising a first traction feature (156a) configured to engage the umbilicus at a first length between the first and second ends and a second traction feature (156b) configured to engage the umbilicus at a second length between the first and second ends.