Pulse Oximeter Automatic Display Orientation via Accelerometer
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Solution Overview
Problem
Current pulse oximeters are large, complex to operate, and lack automatic display orientation adjustment, limiting their convenience and adaptability for wearable, low-cost, high-performance applications in family and community healthcare settings.
Innovation Solution
A digital pulse oximeter with a compact design featuring a single control key and a three-axis accelerometer that automatically adjusts the display orientation, allowing for easy operation and measurement of PI value, blood oxygen saturation, pulse rate, and waveform, using a microprocessor module and power supply system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple keys and manual display orientation control are provided, then more functions are available, but the device becomes large and complex to operate
Solution Approach 1:
The accelerometer automatically detects the device orientation and rotates the display accordingly without user intervention. The system serves itself by using sensor data to autonomously adjust the display orientation, eliminating the need for manual control keys while maintaining full functionality.
Solution Approach 2:
The single control key is designed to perform multiple functions including power on/off, mode switching, and data navigation. This multi-functional key reduces the total number of keys while maintaining comprehensive operational capability, making the device both versatile and easy to operate.
2Adaptability or versatility
If multiple control keys are provided for various functions, then more operations are possible, but the device size increases
Solution Approach 1:
Multiple control functions are merged into a single control key. The key can cycle through different modes (power, measurement mode, display format) and the system interprets different press durations or patterns to execute different functions, consolidating what would traditionally require multiple physical keys into one compact component.
Solution Approach 2:
The accelerometer-based automatic display rotation eliminates the need for dedicated orientation control keys. The system automatically adapts to the device's physical orientation, providing functionality that would otherwise require additional control elements, thereby reducing overall device size.
3Measurement precision
If manual display orientation control is required, then display positioning is precise, but the device is not convenient to operate
Solution Approach 1:
The accelerometer continuously monitors the device's physical orientation and automatically rotates the display to match the user's viewing angle. This self-adjusting mechanism maintains precise display orientation alignment without requiring any manual input from the user, combining accuracy with maximum convenience.
Solution Approach 2:
The mechanical or manual rotation control system is replaced with an electronic sensor-based system. The accelerometer electronically detects orientation changes and triggers software-based display rotation, eliminating the need for mechanical rotation mechanisms or manual control interfaces while maintaining precise orientation accuracy.
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 solution provides a user-friendly, compact pulse oximeter that automatically adjusts its display orientation and enhances functionality with minimal user input, improving convenience and adaptability for diverse healthcare settings.
Implementation Method 1
connecting with one two-axis or three-axis accelerometer
Implementation Method 2
a red infrared light emitting diode
Implementation Method 3
a light-frequency converter, for transmitting the received signals that are emitted by the red infrared light emitting diode and pass through a finger
Data Source
AI summary
A digital pulse oximeter with automatic orientation change function, comprising a housing that is configured to clamp a human finger being tested, a display window disposed at outside of and atop the housing, a circuit being disposed within the housing for calculating and analyzing the tested signals, and displaying them in the display window atop the housing via a display, wherein the said circuit has only one control key disposed on the housing, the said circuit allowing the display contents of the display to be always oriented properly for easy reading by connecting with one two-axis or three-axis accelerometer. The digital pulse oximeter of the present invention is featured with small size and convenient operation and can shift from one function to another using only one control key in conjunction with the interface display, thereby increasing the functions of small-sized pulse oximeters. The present invention uses accelerometers to judge the placing location of the apparatus without the need for any operation from the user, and the apparatus can automatically change the display orientation of the display, thus providing great convenience to the user.