Blood Treatment Cassette Alignment Latching Tilt-Tolerance
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Solution Overview
Problem
Existing blood treatment cassettes face challenges with alignment and latching, leading to tilting and material stress during equipping and removing, which can result in incorrect positioning and potential damage.
Innovation Solution
The use of two spaced-apart alignment devices, with the first device defining translational displacement and the second device determining angular orientation, along with aligning facets and snap-in tongues, ensures a free-of-play arrangement that minimizes tilting and material stress, allowing for ergonomic and safe handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single alignment device is used, then the device complexity is reduced, but the alignment precision and tilt tolerance deteriorate
Solution Approach 1:
The alignment system is segmented into two independent alignment devices positioned at different locations on the cassette. Each alignment device independently defines alignment in specific degrees of freedom, dividing the complex alignment task into manageable segments that collectively achieve precise positioning and orientation while maintaining reasonable device complexity
Solution Approach 2:
The patent transitions from single-point alignment to multi-point spatial alignment by positioning alignment devices at different locations and orientations. This dimensional approach allows the system to control translational displacement and angular orientation simultaneously, achieving comprehensive alignment precision through spatial distribution
2Manufacturing precision
If rigid alignment structures are used, then the alignment precision is improved, but the tilt tolerance and ease of operation worsen
Solution Approach 1:
The alignment devices incorporate dynamic characteristics that allow controlled movement and adjustment during the equipping process. The system transitions from a rigid fixed-position alignment to a dynamic alignment that accommodates operational requirements, enabling easy insertion and removal while maintaining precision through controlled degrees of freedom
Solution Approach 2:
The patent employs parameter changes in the alignment mechanism, specifically in the snap-in tongues and latching edges, that allow the system to adapt between precise alignment mode and easy operation mode. The mechanical parameters of the alignment devices are designed to change state during equipping, facilitating both precision and ease of use
3Device complexity
If alignment devices are positioned close together, then the device complexity is reduced, but the ability to prevent tilting and material stress worsens
Solution Approach 1:
The alignment function is segmented across two spatially separated devices, with each device positioned to address specific alignment requirements. This segmentation allows the system to independently control different aspects of alignment, preventing tilting and material stress through distributed alignment points that provide stable geometric constraints
Solution Approach 2:
The alignment devices are positioned and configured in advance to preemptively prevent tilting and material stress during the equipping process. The spatial arrangement of the two alignment devices creates predetermined geometric relationships that guide the cassette into proper orientation before operational forces are applied, preventing harmful tilting and stress concentrations
Data Source
AI summary
A fluid cassette, for example, a blood treatment cassette having a cassette body embodied as a hard part and, optionally, a film which is connected to the hard part and at least partially covers the hard part, wherein the hard part comprises at least one first alignment device, and a second alignment device which are optionally arranged at first and second opposite sides of the fluid cassette or are attached thereon. The disclosure relates in addition to a blood treatment apparatus.