Hall Device Pulsimeter Sensor for Noninvasive Pulse Detection
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Solution Overview
Problem
Conventional pulsimeter sensors using pressure sensors are invasive, difficult to accurately measure spatial characteristics of pulses, and limited in understanding traditional pulse diagnosis qualities, with issues in locating radial arteries and generating pain during measurement.
Innovation Solution
A pulsimeter sensor employing a hall device with a magnetic material skin-contacting part and an array-type pulse-sensing part, allowing for noninvasive measurement of magnetic field changes to detect radial pulses, enabling quick location identification and comprehensive spatial pulse characterization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressure sensors are used to measure pulses noninvasively, then the measurement is noninvasive and avoids blood vessel injection, but the measurement precision and ability to detect exact pulse characteristics is compromised
Solution Approach 1:
The patent replaces the mechanical pressure sensor system with a magnetic field-based detection system. Instead of using pressure sensors that require direct skin contact and mechanical pressure application, the invention uses hall devices to detect magnetic field changes caused by pulse-induced movements of magnetic particles in the skin, thereby achieving noninvasive measurement without mechanical contact.
Solution Approach 2:
The patent introduces magnetic particles as an intermediary between the pulse signal and the detection device. These particles are embedded in the skin and respond to pulse-induced movements by changing the magnetic field, which is then detected by the hall device. This intermediary enables noninvasive detection while maintaining measurement precision.
2Measurement precision
If pressure sensors are used to detect pulse pressure changes, then pulse pressure can be measured, but spatial characteristics such as depth, area, and length of the pulse cannot be understood
Solution Approach 1:
The patent transitions from one-dimensional pressure measurement to three-dimensional spatial detection by using an array of hall devices that can detect magnetic field changes at multiple positions simultaneously. This enables measurement of spatial characteristics including depth, area, and length of the pulse by analyzing the distribution and magnitude of magnetic field changes across the sensor array.
Solution Approach 2:
The patent divides the detection system into multiple segmented hall devices arranged in an array, each capable of detecting magnetic field changes at its specific position. This segmentation allows for simultaneous measurement of pulse characteristics at different spatial locations, providing comprehensive spatial information that cannot be obtained with a single pressure sensor.
3Measurement precision
If conventional pressure sensors are used, then pulse pressure changes can be detected, but the device complexity increases due to multiple components including silicon layers, gels, and plates
Solution Approach 1:
The patent extracts and eliminates the complex mechanical components (silicon layers, gels, plates) from the sensor structure, retaining only the essential magnetic field detection functionality. By using hall devices to detect magnetic field changes directly, the invention simplifies the sensor structure while maintaining the ability to detect pulse pressure changes and spatial characteristics.
Solution Approach 2:
The patent replaces the complex mechanical pressure transmission system with a magnetic field-based detection system. Instead of using multiple mechanical components to transmit and measure pressure, the invention uses hall devices to detect magnetic field changes caused by pulse-induced movements of magnetic particles, thereby simplifying the overall device structure.
4Measurement precision
If pressure sensors are used to locate radial arteries, then pulse measurement can be performed, but the time required to search for and locate the pulse increases
Solution Approach 1:
The patent applies preliminary action by pre-positioning magnetic particles in the skin at potential pulse locations before measurement begins. When the hall device array scans the area, these pre-positioned particles immediately respond to pulse-induced movements, allowing for rapid detection and location of radial arteries without requiring time-consuming manual search or trial-and-error positioning.
Solution Approach 2:
The patent uses the spatial arrangement of the hall device array to efficiently search for and locate radial arteries. By detecting magnetic field changes at multiple positions simultaneously across a two-dimensional area, the system can quickly identify the location of pulse signals without requiring sequential one-dimensional scanning, thereby reducing the time required to locate radial arteries.
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
Enables precise measurement of all 28 traditional pulse diagnosis qualities, reduces measurement time, and provides a portable, pain-free solution for pulse detection.
Implementation Method 1
a pulse-sensing part array which consists of a hall device and is located over the skin-contacting part; when a radial pulse transferred to the magnetic material of the skin-contacting part results in changes in a magnetic field of the lower part of the pulse-sensing part array, these changes in the magnetic field can be detected by the hall device
Data Source
AI summary
The present invention relates to a noninvasive medical pulsimeter sensor using a hall device. By forming a pulse-sensing part array with a hall device as a magnetic sensor, over the skin-contacting part which consists of a magnetic material, the present invention increases the integrity of sensors, enables to understand the spatial characteristics of the pulse which cannot be determined by the conventional pressure sensors, minimize the time for searching the pulse, and is applicable widely to portable pulsimeters and the likes.