Manometer Alignment Spur for Respiratory Pressure Accuracy
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Solution Overview
Problem
Existing pressure manometers for respiratory systems are not simple, sensitive, efficient, and reliable for continuous measurement of small and sudden pressure changes in a gaseous environment, particularly in the context of human respiration, where they need to respond to up to 40 cycles per minute and maintain accuracy over 3000 cycles.
Innovation Solution
A pressure measuring manometer with a linear gear rack and pinion gear system that converts diaphragm deflection into rotational motion, using an alignment spur to ensure precise movement and rapid response to pressure changes, along with a biasing spring for zero-state and resistance, and an integrated alarm for alerting prolonged inaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a traditional pressure gauge mechanism is used, then the device structure is simple, but the response speed to sudden pressure changes is slow
Solution Approach 1:
The pressure measurement mechanism is segmented into distinct functional components: diaphragm for pressure sensing, gear rack for linear motion conversion, pinion gear for rotational motion, and alignment spur for positioning. This segmentation allows each component to be optimized for its specific function, enabling rapid response to pressure changes while maintaining manageable structural complexity
Solution Approach 2:
The patent replaces traditional slow-response mechanical pressure gauge mechanisms with a gear-driven system that converts diaphragm deflection into rotational motion of the indicator needle. This mechanical substitution enables much faster response to sudden pressure changes, achieving response times suitable for monitoring rapid respiratory pressure variations
2Measurement precision
If a simple indicator mechanism is used, then the device is easy to manufacture, but the measurement precision of small pressure changes is insufficient
Solution Approach 1:
The patent converts the linear deflection of the diaphragm into rotational motion through the gear rack and pinion mechanism. This dimensional transformation amplifies small linear displacements into larger angular movements of the indicator needle, significantly improving the visibility and precision of small pressure change measurements while using straightforward mechanical components
Solution Approach 2:
The gear rack acts as an intermediary mechanism between the diaphragm and the indicator needle. It translates minimal diaphragm deflection (as small as 0.03 inch) into proportional rotational movement, enabling precise measurement of subtle pressure changes without requiring complex sensing electronics or manufacturing processes
3Manufacturing precision
If the pinion gear is positioned far from the linear rack gear, then the indicator needle has more movement freedom, but the movement uniformity and precision are reduced
Solution Approach 1:
The alignment spur acts as a counterbalancing element that offsets the positional distance between the pinion gear and linear rack gear. By providing a physical reference and positioning feature, it ensures the pinion remains correctly aligned with the rack throughout operation, maintaining movement precision without requiring complex adjustment mechanisms or tight tolerances on component positioning
4Stability of the object's composition
If the alignment spur is not included, then the device has fewer parts, but the pinion gear cannot maintain proper orientation perpendicular to the diaphragm element
Solution Approach 1:
The alignment spur is integrated directly onto the pinion gear assembly, making it a self-contained positioning feature. The spur automatically engages with the linear rack to establish and maintain the correct perpendicular orientation between the pinion axis and diaphragm element throughout operation, eliminating the need for separate adjustment mechanisms or additional alignment components
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 manometer provides accurate and reliable pressure measurements with minimal response time and high cycle durability, capable of detecting small pressure changes as low as 0.03 inch deflections, and includes an alarm for alerting critical conditions such as cessation of breathing.
Implementation Method 1
a pressure measuring manometer configured to show positive and/or negative changes in pressure of a test fluidic environment relative to a an ambient fluid environment
Implementation Method 2
a linear gear rack that moves in response to motion of a diaphragm as the diaphragm deflects relative to cyclic increase and decrease in pressure
Implementation Method 3
A pinion gear is engaged to the linear gear rack such that as the linear gear rack moves back and forth in a linear orientation, the associated pinion gear converts the linear motion into a corresponding rotational moment
Implementation Method 4
A biasing spring may be included within the device so as to act upon the linear gear rack and the indicating needle associated pinion to establish a zero-state and provide resistance to movement of the indicator until energy is imparted upon the diaphragm element by a change in pressure
Data Source
AI summary
A measuring device for detecting and indicating changes in fluid pressure of a test environment relative to ambient fluid conditions, wherein the measuring device includes a linear gear rack having an alignment spur, an indicator needle associated pinion gear, calibrated indicia for visual measure of a pressure change event, and a deflectable diaphragm element. The alignment spur acts upon the pinion gear by maintaining close relationship of the linear gear rack and the needle associated pinion gear and counteracts torque and off-center forces created by the linear rack gear upon deflection of the deflectable diaphragm, thus providing improved resolution of small pressure changes and increased accuracy of measurement as the measuring device operates through a cycling period.