Cylindrical Filter Spacer for Uniform Body Fluid Flow
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Solution Overview
Problem
Existing body fluid-treating filter devices face challenges in maintaining clinically safe treating pressure and achieving effective body fluid recovery, with issues such as pressure increase and incomplete fluid recovery due to uneven flow and structural limitations.
Innovation Solution
The introduction of a cylindrical body fluid-treating filter device with a cylindrical housing, a cylindrical filter layer, and a spacer layer with a thickness of 0.7 to 3.5 mm between the filter layer and the housing, along with a flow passage resistant member, which improves fluid flow distribution by allowing uniform flow and reducing pressure loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a flat-type or cylindrical filter device is used with a filter layer housed in a housing, then the device structure is simple and easy to manufacture, but the body fluid flow becomes uneven causing pressure increase and incomplete fluid recovery
Solution Approach 1:
A porous spacer layer is introduced as an intermediary component between the filter layer and the housing. This spacer layer mediates the flow distribution by providing a uniform flow path for body fluid across the entire surface of the filter layer, preventing uneven flow and pressure increase while maintaining the simple cylindrical device structure.
2Reliability
If the spacer layer thickness is increased to improve flow distribution, then flow uniformity improves, but device volume increases
Solution Approach 1:
The spacer layer thickness is optimized to a specific parameter range (0.7-3.5mm) that provides sufficient flow distribution uniformity while minimizing device volume. This parameter optimization ensures that the spacer layer is thick enough to establish uniform flow patterns but thin enough to keep the overall device compact and clinically acceptable.
3Reliability
If a flow passage resistant member is added to control flow distribution, then pressure control improves, but device complexity increases
Solution Approach 1:
A flow passage resistant member is strategically positioned at specific locations within the device (such as at the inlet end or at specific heights) to provide localized flow resistance. This local quality approach allows pressure control and flow distribution improvement without requiring complex structures throughout the entire device, maintaining relative simplicity while achieving reliable pressure control.
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 configuration maintains treating pressure within a clinically safe range and ensures excellent body fluid recovery with minimal residual fluid, preventing clogging and pressure fluctuations.
Implementation Method 1
a porous spacer layer with a thickness of 0.7 to 3.5 mm is provided between an outer circumference of the cylindrical filter layer and the housing and between an inner peripheral surface of the cylindrical filter layer and the flow passage resistant member
Data Source
AI summary
A body fluid treating filter device capable of maintaining its treating pressure within a clinically safe pressure range even if body fluid treatment is performed over a long period and having excellent property for recovering a body fluid after the body fluid treatment is completed. A body fluid treating cylindrical filter layer is stored in a cylindrical container having two body fluid flow ports. The cylindrical filter layer is disposed so that the inner space of a container can be divided into two parts by making its both end parts fluid-tight and fixing at least one of these both end parts to the inner wall surface of the container. One of the inner spaces of the container divided by the cylindrical filter layer is allowed to communicate with the first body fluid flow port and the other of the inner spaces of the container divided by the cylindrical filter layer is allowed to communicate with the second body fluid flow port. The body fluid treating cylindrical filter device is characterized in that a bar-like flow passage resistant member extending along the center axis is installed in the hollow part of the cylindrical filter layer, and a spacer layer for flowing the body fluid of 0.7 to 3.5 mm in thickness is formed between the outer peripheral surface of the cylindrical filter layer and the container and between the inner peripheral surface of the cylindrical filter layer and the flow passage resistance member.