Pump-less Breath Analysis Valve Flow Regulation
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Solution Overview
Problem
Existing breath analysis devices for measuring ketones are inaccurate for non-Keto diet applications due to their inability to reliably detect ketone levels below 9 parts per million, and the addition of a pump increases complexity and cost, introducing delays in measurement processes.
Innovation Solution
A pump-less breath analysis device that dynamically adjusts the flow of breath past an analyte sensor using a processor-controlled valve, regulating the flow rate based on real-time pressure measurements from the user's exhalation force, maintaining the pressure within a specific range to ensure accurate ketone measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pump is added to control breath flow rate, then measurement accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent removes the pump component from the device entirely, extracting the problematic element that caused complexity and cost increases. Instead of using active pump control, the device relies on passive flow regulation through valve control during user exhalation, achieving measurement accuracy without the need for complex pumping mechanisms.
Solution Approach 2:
The device utilizes the user's own exhalation force to drive breath flow through the sensor, eliminating the need for external pump power sources. The system self-regulates flow by capturing the natural exhalation pressure and using a valve to control the portion of breath that passes over the sensor, making the device simpler and more cost-effective.
2Measurement precision
If a pump is added to control breath flow rate, then measurement accuracy is improved, but measurement time increases due to breath capture delay
Solution Approach 1:
The device performs preliminary valve positioning and flow path setup before the user completes their exhalation. The valve is pre-configured to direct breath flow appropriately as the user exhales, allowing immediate measurement without waiting for a separate capture phase. This eliminates the time delay associated with pump-based capture systems.
Solution Approach 2:
The measurement process continues uninterrupted during the user's exhalation phase. As the user exhales, the valve dynamically controls flow in real-time, allowing continuous measurement without pausing to capture breath in a separate chamber. This continuous action eliminates the time loss between breath capture and analysis.
3Productivity
If a pump is added to control breath flow rate, then flow rate regulation is improved, but device cost increases
Solution Approach 1:
The patent extracts the expensive pump component from the device architecture, replacing it with a simpler valve control mechanism. This removal of the pump significantly reduces manufacturing costs while maintaining flow rate regulation capability through passive valve control during user exhalation.
Solution Approach 2:
The patent replaces the mechanical pump system with a valve-based flow control system that uses the user's exhalation pressure as the driving force. This substitution eliminates the need for motorized pumping mechanisms, reducing both manufacturing complexity and cost while achieving the desired flow rate regulation.
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 provides accurate ketone measurements without the need for a pump, reducing complexity and cost while maintaining the flow rate within a desired range, ensuring reliable results for various applications.
Implementation Method 1
a pressure sensor that detects pressure produced by a user's exhalation force into the breath input port
Implementation Method 2
a valve that the processor controls to regulate a flow rate of the breath sample passing by the sensor based on the detected pressure
Data Source
AI summary
A pump-less breath analysis device regulates the flow of breath past an analyte sensor, which may be a semiconductor sensor, by dynamically adjusting the state or position of a valve as the user exhales into the device. The valve controls the flow of incoming breath between two flow paths: a venting path through which breath exits the device without passing by the sensor, and a sensing path that includes the sensor. In some embodiments, the valve is controlled by a processor that monitors pressure produced by the user's exhalation force. Based on these real-time pressure measurements, the processor adjusts the valve to maintain the pressure, and thus the flow rate, in the sensing path within a desired range. The processor may also use the pressure measurements to determine whether the characteristics of the user's exhalation are sufficient to generate a valid measurement.