Proximity sensor circuits and related sensing methods
US-2020305740-A1 · Oct 1, 2020 · US
Bio-signal detection
US12458268B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12458268-B2 |
| Application number | US-201816761669-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 20, 2018 |
| Priority date | Nov 24, 2017 |
| Publication date | Nov 4, 2025 |
| Grant date | Nov 4, 2025 |
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- Title
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Abstract
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An apparatus comprising: a displacement current sensor configured to measure for a subject one or more sensed electrical signals; and circuitry configured to process the one or more sensed electrical signals to obtain an electrocardiogram signal and a variable impedance signal caused by an arterial pulse wave.
First claim
Opening claim text (preview).
We claim: 1 . An apparatus comprising: a displacement current sensor configured to measure for a subject one or more sensed electrical signals, wherein the displacement current sensor comprises at least one electrode; and circuitry configured to process the one or more sensed electrical signals from the displacement current sensor to obtain an electrocardiogram (ECG) signal and a variable impedance signal caused by an arterial pulse wave, wherein the circuitry configured to process the one or more sensed electrical signals to obtain the electrocardiogram signal and the variable impedance signal caused by the arterial pulse wave is configured to measure the variable impedance signal caused by the arterial pulse wave as a modulation of the ECG signal. 2 . An apparatus as claimed in claim 1 , wherein the circuitry configured to process the one or more sensed electrical signals to obtain an electrocardiogram signal and variable impedance signal caused by an arterial pulse wave is configured to: obtain an Imaginary part of a signal dependent upon an impedance between first and second guard electrodes of an ECG electrode. 3 . An apparatus as claimed in claim 1 , wherein the displacement current sensor comprises a displacement current electrode having a capacitance that varies with varying arterial blood volume under the displacement current sensor when in situ; wherein the circuitry configured to process the one or more sensed electrical signals to obtain the electrocardiogram signal and the variable impedance signal caused by the arterial pulse wave, is configured to: process the signal at the displacement current electrode to measure the variable impedance signal caused by the arterial pulse wave. 4 . An apparatus as claimed in claim 3 , wherein the displacement current electrode comprises resiliently flexible dielectric. 5 . An apparatus as claimed in claim 3 , wherein the circuitry configured to process the one or more sensed electrical signals to obtain the electrocardiogram signal and the variable impedance signal caused by the arterial pulse wave, is configured to: in the frequency domain, remove the variable impedance signal from the one or more sensed electrical signals to obtain the electrocardiogram signal. 6 . An apparatus as claimed in claim 1 , wherein the circuitry is configured to use the variable impedance signal dependent upon an impedance between first and second guard electrodes of an ECG electrode as an external reference signal for an adaptive filter for filtering the sensed signal.
Assignees
Inventors
Classifications
Capacitive electrodes · CPC title
- A61B5/28Primary
for electrocardiography [ECG] · CPC title
Capacitive electrodes · CPC title
Details of analogue processing, e.g. isolation amplifier, gain or sensitivity adjustment, filtering, baseline or drift compensation (input circuits for detecting, measuring, or recording bioelectric or biomagnetic signals A61B5/30; specific diagnostic methods using bioelectric or biomagnetic signals A61B5/316) · CPC title
from analysis of pulse wave characteristics · CPC title
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Frequently asked questions
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- What does patent US12458268B2 cover?
- An apparatus comprising: a displacement current sensor configured to measure for a subject one or more sensed electrical signals; and circuitry configured to process the one or more sensed electrical signals to obtain an electrocardiogram signal and a variable impedance signal caused by an arterial pulse wave.
- Who is the assignee on this patent?
- Nokia Technologies Oy
- What technology area does this patent fall under?
- Primary CPC classification A61B5/28. Mapped technology areas include Human Necessities.
- When was this patent published?
- Publication date Tue Nov 04 2025 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).