Filter Test Strip Gap Masking for Blood Cell Separation
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Solution Overview
Problem
Conventional filter test strips suffer from uneven surfaces and gaps between the filter cotton and holding layers, allowing blood cells to pass through and affecting test accuracy due to inadequate bonding between the filter cotton and cotton bonding layers.
Innovation Solution
A filter test strip design featuring a filter cotton holding layer with a filter channel, a filter cotton layer, and a cotton bonding layer where the adhesive fully covers the circumference of the filter channel to mask gaps between the layers, ensuring complete filtration of specimens in liquid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If porous material is used to filter blood cells, then filtration function is provided, but gaps and uneven surfaces form at borders allowing blood cells to pass through
Solution Approach 1:
The patent applies local quality by using a cotton bonding layer specifically at the border regions where gaps occur, while the central area uses filter cotton. This localized reinforcement ensures uniform bonding across the entire filter assembly, preventing blood cell leakage through gaps without compromising the overall filtration structure.
Solution Approach 2:
The patent combines different materials (filter cotton and cotton bonding layer) in a composite structure. The cotton bonding layer is specifically positioned at the borders to supplement the filter cotton, creating a unified structure that eliminates gaps and ensures reliable filtration of blood cells.
2Strength
If adhesive bonds filter cotton to cotton bonding layer, then structural connection is achieved, but gaps remain between layers allowing blood cell passage
Solution Approach 1:
The adhesive is applied with local quality by extending it to fully cover the circumference of the filter channel, particularly concentrating on the border regions where gaps are most likely to occur. This ensures strong bonding at critical locations while maintaining the overall structure.
Solution Approach 2:
The cotton bonding layer acts as an intermediary between the filter cotton and the substrate. It provides a bonding interface that connects the filter cotton to the test element, ensuring structural integrity and preventing gaps that would allow blood cell leakage.
3Measurement precision
If filter cotton is placed in filter channel, then plasma filtration is achieved, but residual blood cells remain affecting test accuracy
Solution Approach 1:
The cotton bonding layer is strategically positioned at the borders of the filter channel where gaps are most likely to occur. This localized reinforcement ensures that the adhesive fully covers the circumference of the filter channel, preventing blood cell leakage through border gaps and ensuring complete filtration for accurate test results.
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 design enhances test accuracy by preventing blood cells from seeping through, allowing only plasma to pass through the filter cotton layer, thus meeting the requirements for accurate physiological testing.
Implementation Method 1
The cotton bonding layer is located below the filter cotton holding layer and bonded to the test element via an adhesive which fully covers the circumference of the filter channel and masks the gap between the filter cotton holding layer and filter cotton layer
Implementation Method 2
The filter cotton layer fills the corresponding filter channel. A gap is formed between the filter cotton holding layer and filter cotton layer
Data Source
AI summary
A filter test strip to filter and test a specimen in liquid includes a test element and a specimen filter assembly which is located on the test element and includes a filter cotton holding layer, a filter cotton layer and a cotton bonding layer. The filter cotton holding layer has a filter channel to allow the specimen in liquid to pass through. The filter cotton layer fills the filter channel. A gap is formed between the filter cotton holding layer and filter cotton layer. The cotton bonding layer is located below the filter cotton holding layer and bonded to the test element via an adhesive which masks the gap. Hence the specimen in liquid can be prevented from seeping out through the gap with passing through the filter cotton layer. Therefore, the specimen in liquid can fully be filtered by the filter cotton layer to enhance test accuracy.