Filter Status Detection Using Pressure Differential in Sealed Channels
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Solution Overview
Problem
The service life of filters in medical devices, such as anesthesia machines and ventilators, is difficult to determine due to varying environmental conditions, leading to potential damage from overused filters if maintenance or replacement is overlooked.
Innovation Solution
A status detection method and apparatus using a pressure sensor downstream of the filter, which acquires pressure values at different flow rates to determine the filter's status by calculating differences between these values, facilitating timely maintenance or replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If filter service life is extended to reduce maintenance frequency, then productivity is improved, but reliability deteriorates due to inability to detect filter degradation
Solution Approach 1:
The patent implements feedback by continuously monitoring pressure differential across the filter using pressure sensors. The control unit receives real-time pressure data, compares it against threshold values, and provides feedback about filter status. This enables the system to detect filter degradation automatically and prompt maintenance before the filter fails, thus maintaining reliability while allowing extended service intervals.
Solution Approach 2:
The patent replaces manual filter status assessment with automated electronic detection. Instead of relying on mechanical indicators or manual inspection, the system uses pressure sensors and electronic control units to automatically monitor filter condition. This substitution enables continuous monitoring without increasing maintenance frequency, resolving the contradiction between extended service life and reliable status detection.
2Reliability
If pressure sensors are added to detect filter status, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing a detection system where pressure sensors serve multiple functions. The same pressure sensors used for filter status detection can also be utilized for other medical device functions such as breath pressure monitoring or gas flow control. This multi-functionality reduces the need for additional dedicated sensors, thereby maintaining reliability while minimizing the increase in device complexity.
Solution Approach 2:
The system implements self-service by using the existing gas flow through the medical device to automatically generate the pressure differential needed for detection. The normal operation of the device creates the flow conditions required for the pressure sensors to measure filter status, eliminating the need for separate test mechanisms or additional components. The system monitors itself using its own operational characteristics.
3Ease of manufacture
If manual filter inspection is performed, then detection cost is reduced, but loss of time increases due to operator oversight
Solution Approach 1:
The patent replaces manual inspection with automated electronic detection. The control unit continuously monitors pressure differential and automatically detects when filter maintenance is needed, eliminating reliance on operator memory and attention. This automation prevents time loss due to human oversight while keeping costs reasonable by using simple pressure sensors and basic electronic control logic rather than complex systems.
Solution Approach 2:
The system provides immediate feedback through visual or audible alerts when filter status requires attention. This real-time feedback mechanism ensures that maintenance is prompted at the exact moment it becomes necessary, eliminating the time loss associated with manual inspection schedules and operator forgetfulness. The feedback loop ensures timely response without requiring continuous manual monitoring.
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 approach allows for accurate detection of filter status, prompting operators to maintain or replace filters promptly, thereby preventing performance degradation and damage to medical devices, while utilizing existing components to keep costs low.
Implementation Method 1
acquiring a first pressure value measured by the pressure sensor; if the fluid flowing through the filter in the sealed channel is controlled to have a second flow rate, then acquiring a second pressure value measured by the pressure sensor
Data Source
AI summary
Embodiments of the present application provide a status detection method and apparatus for a filter. The filter filters a fluid in a sealed channel. At least a pressure sensor is further provided downstream of the filter in the sealed channel. The method includes: if a fluid flowing through a filter in a sealed channel is controlled to have a first flow rate, then acquiring a first pressure value measured by a pressure sensor; if the fluid flowing through the filter in the sealed channel is controlled to have a second flow rate, then acquiring a second pressure value measured by the pressure sensor; and determining a status of the filter according to a difference between the first pressure value and the second pressure value. Therefore, detection of the status of the filter is achieved, and an operator is prompted to maintain/replace the filter in time. In addition, an existing component can be used, so that applicability is high and detection costs are low.