Rotatable Sensor for Wrist Pulse Detection

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing electronic devices worn on the wrist to measure biological information face challenges in accurately acquiring data due to difficulties in stable positioning and noise interference, which affects measurement accuracy.

Innovation Solution

The electronic device incorporates a sensor with a rotatable and adjustable design, featuring a pulse contact pad and an angular velocity sensor, which detects pulsation by rotating and displacing to align orthogonally with the skin surface, minimizing noise and ensuring accurate contact with the radial artery, and a controller that calculates indices from the pulse wave to estimate glucose and lipid metabolism states.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the sensor is fixed in a predetermined position, then the device structure is simple, but the measurement accuracy deteriorates due to unstable positioning and noise interference

Engineering Contradiction:

Improvepulsation detection accuracyVSAvoidsensor structure complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The sensor is designed with rotational freedom and elastic deformation capability, transitioning from a fixed static structure to a dynamic adaptive structure. The sensor can rotate around the radial artery and deform elastically to maintain orthogonal contact with the skin surface, automatically adapting to positional variations and maintaining measurement accuracy without complex adjustment mechanisms.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The sensor's orientation angle and contact position are changed dynamically to optimize measurement conditions. By allowing the sensor to rotate and deform, the system changes its geometric parameters (orientation, position) to maintain the optimal orthogonal relationship with the skin surface, thereby improving measurement precision while keeping the structure relatively simple.

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If the sensor is made adjustable and rotatable, then the measurement accuracy improves, but the device complexity increases

Engineering Contradiction:

Improvesensor contact accuracyVSAvoidsensor mechanism complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The sensor structure serves itself by automatically adapting to the correct position and orientation through its inherent rotational freedom and elastic deformation properties. The sensor naturally seeks the optimal contact configuration with the skin surface without requiring external adjustment mechanisms, control systems, or complex actuators, thereby improving measurement accuracy while minimizing added complexity.

Inventive Principle:

Principle #25Self-service

3Measurement precision

If the sensor contacts the skin at non-optimal angles, then the device is easier to wear, but noise interference increases and measurement accuracy deteriorates

Engineering Contradiction:

Improvepulsation signal qualityVSAvoidnoise interference

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The sensor dynamically adjusts its contact angle with the skin surface through elastic deformation and rotation, maintaining the optimal orthogonal relationship during wear. This dynamic adaptation ensures that even when the device is worn in slightly different positions, the sensor automatically corrects its orientation to minimize noise interference and maintain high measurement precision.

Inventive Principle:

Principle #15Dynamics

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 configuration enhances measurement accuracy by reducing noise and improving the stability of data acquisition, allowing for non-invasive and efficient estimation of blood fluidity, glucose, and lipid metabolism states.

Implementation Method 1

a sensor with a rotatable and adjustable design, featuring a pulse contact pad and an angular velocity sensor, which detects pulsation by rotating and displacing to align orthogonally with the skin surface

Methodology Applied

Scientific EffectAngular velocity sensing:

Implementation Method 2

The sensor is urged to a test part side of an examinee and is able to detect pulsation at the test part

Methodology Applied

Scientific EffectPulsation detection:

Data Source

PatentUS11594118B2Electronic device

Publication Date: 2023.02.28 KYOCERA CORP

AI summary

An electronic device comprises a sensor, a notifier and a controller. The sensor is urged to a test part side of an examinee and can detect pulsation at the test part. The notifier notifies information for a position of the sensor at the test part. The controller controls the notifier to notify information for a position of the sensor at the test part based on pulsation at the test part detected by the sensor.