ECG Interface Data Link for Low-Power External Sensors

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Solution Overview

Problem

Wearable devices like smartwatches are limited by their fixed sensor sets, making it costly and complex to incorporate specialized sensors for niche user needs, and existing communication protocols like Bluetooth Low Energy are power-intensive and expensive.

Innovation Solution

Leveraging electrocardiogram (ECG) hardware as a communication interface for external sensors, encoding sensor data as voltage fluctuations, allowing low-power communication with minimal components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If specialized sensors are incorporated into wearable devices, then sensor functionality and versatility are improved, but device complexity and manufacturing cost increase

Engineering Contradiction:

Improvesensor functionalityVSAvoiddevice complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The ECG interface is designed to serve dual purposes: its primary function for cardiac monitoring and a secondary function as a communication interface for external sensors. This multi-functionality allows the device to accommodate specialized sensors without adding dedicated communication hardware, thereby reducing overall device complexity while maintaining versatility.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent uses the ECG signal as an intermediary medium to transmit data from external sensors to the wearable device's processor. Instead of requiring direct wireless communication components in both the sensor and the watch, the ECG interface acts as a mediator that enables data transfer through the existing hardware, simplifying the system architecture.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If specialized sensors are incorporated into wearable devices, then sensor functionality and versatility are improved, but manufacturing cost increases

Engineering Contradiction:

Improvesensor functionalityVSAvoidmanufacturing cost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

By making the ECG interface multi-functional for both cardiac monitoring and sensor data communication, the patent eliminates the need for separate communication hardware in each device. This reduces component count and assembly complexity, leading to lower manufacturing costs while enabling specialized sensor functionality.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

Using the ECG interface as an intermediary communication channel eliminates the need for expensive wireless communication components in both the wearable device and the external sensor. This intermediary approach significantly reduces bill of materials costs and simplifies the manufacturing process.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Adaptability or versatility

If Bluetooth Low Energy is used for sensor data communication, then communication capability is improved, but power consumption increases

Engineering Contradiction:

Improvecommunication capabilityVSAvoidpower consumption

Core Design Contradiction:

Adaptability or versatilityVSUse of energy by moving object

Solution Approach 1:

The ECG interface serves as a low-power intermediary that leverages the existing analog signal processing infrastructure for communication. By using the ECG hardware's amplifiers and analog-to-digital converters to transmit sensor data, the system avoids the high power consumption associated with wireless radio transmission, achieving energy-efficient communication.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces the wireless communication mechanism (radio frequency transmission) with an electrical signal-based mechanism using the ECG interface. This substitution eliminates the need for radio transceivers and associated power consumption, utilizing the existing electrical infrastructure for data transfer instead.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 cost-effective and low-power communication of specialized sensor data, enhancing wearable device functionality without the need for additional microcontrollers or radios, reducing production costs and power consumption.

Implementation Method 1

encoding sensor data as voltage fluctuations

Methodology Applied

Scientific EffectVoltage fluctuation encoding:

Data Source

PatentUS20250344997A1Sensor data communication using ECG interface

Publication Date: 2025.11.13 UNIV OF WASHINGTON

AI summary

An example method involves providing data from an external sensor device to an electrocardiogram (ECG) application, and then decoding the ECG application's output to obtain the original sensor data. Systems described herein include external sensor devices which may provide sensor data to electronic devices, such as smartwatches, through an ECG interface.