Plunger-Driven Liquid Filtration for Particulate Detection
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Solution Overview
Problem
Current methods for testing the presence of particulates, such as bacteria, in fluids are inefficient and lack effective means for filtering and detecting particulates in gargled fluids or saliva not swabbed from the throat.
Innovation Solution
A testing device comprising a liquid container, a filter disposed downstream of the container, and a liquid-pressure source to drive the liquid through the filter, along with a filter chamber and optional valves and heating elements, is used to trap and test for particulates in fluids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a filter is used to trap particulates in liquid, then the detection accuracy of pathogens is improved, but the liquid flow rate decreases
Solution Approach 1:
The patent employs a filter with controlled porosity to trap particulates while allowing liquid to pass through. The filter is designed with specific pore sizes and distributions to optimize both particle capture efficiency and liquid flow rate, resolving the contradiction between detection accuracy and flow rate.
2Productivity
If pressure is applied to drive liquid through the filter, then the testing efficiency is improved, but the risk of particulate breakthrough increases
Solution Approach 1:
The patent employs a multi-stage filtration system with progressively tighter pore sizes. As liquid passes through each stage, the pore size decreases, allowing the system to handle high flow rates initially while progressively capturing smaller particulates, thus maintaining both testing efficiency and capture reliability under pressure.
Solution Approach 2:
Different regions of the filter have different pore size characteristics. The filter transitions from larger pores at the inlet to smaller pores at the outlet, creating local quality variations that optimize both flow rate and particle capture at different stages of the filtration process.
3Measurement precision
If the filter area is increased to improve particulate trapping, then the detection sensitivity is improved, but the device complexity increases
Solution Approach 1:
The filter is integrated within the existing liquid container structure, with the filter chamber formed as part of the container wall. This nested arrangement increases the effective filter area without adding separate external components, thereby improving detection sensitivity while minimizing device complexity.
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 device effectively traps at least 40% of particulates, such as group A streptococcus bacteria, while allowing the fluid to pass, enabling efficient testing for the presence of pathogens in clinical samples.
Implementation Method 1
a filter, disposed in or downstream of the liquid container... The filter is configured to trap at least 40% of group A streptococcus bacteria and allow passage of the liquid
Implementation Method 2
a liquid-pressure source, which is arranged to apply pressure to drive the liquid contained in the liquid container through the filter
Data Source
AI summary
A testing device is provided for testing for the presence of particulate in a liquid. The testing device includes a liquid container, a filter, a waste liquid receptacle, and a plunger. The plunger includes a plunger head shaped so as to be insertable into the liquid container. The testing device is configured such that relative motion between the plunger head and the liquid container drives the liquid contained in the liquid container through the filter and then into the waste liquid receptacle. The plunger is shaped so as to define a filter-receiving chamber, which is shaped so as to define an inlet that passes through the plunger head. The filter is removably disposed on the plunger head, and arranged in the testing device to be movable at least partially into the filter-receiving chamber via the inlet after the liquid has been driven through the filter. Other embodiments are also described.