US 11,511,119 B2Granted

Impedance sensing

AssigneeMedtronic, Inc.

InventorsMelissa G. T. Christie, Ronald A. Drake, Vladimir P. Nikolski, Bushan K. Purushothaman, Xusheng Zhang

Life of this patent

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Abstract

In some examples, a medical device system includes an electrode. The medical device system may include impedance measurement circuitry coupled to the electrode, the impedance measurement circuitry may be configured to generate an impedance signal indicating impedance proximate to the electrode. The medical device system may include processing circuitry that may be configured to identify a first component of the impedance signal. The first component of the impedance signal may be correlated to a cardiac event. The processing circuitry may be configured to determine that the cardiac event occurred based on the identification of the first component of the impedance signal.

Claims18

Dependent claims

A medical device system comprising:

an electrode;
impedance measurement circuitry coupled to the electrode, the impedance measurement circuitry configured to generate an impedance signal indicating impedance proximate to the electrode;
and
processing circuitry configured to identify a plurality of first components within the impedance signal, each of the first components caused by a respective one of a plurality of cardiac depolarizations, wherein the impedance signal further comprises a plurality of second components, each of the second components caused by a respective one of a plurality of cardiac contractions,
wherein, to identify each first component of the plurality of first components, the processing circuitry is configured to:
detect a change in at least one of an amplitude or a slope in the impedance signal that exceeds a respective threshold;
and
identify the first component based on detecting the change in at least one of the amplitude or the slope of the impedance signal that exceeds the respective threshold.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/156,960Filed 25 Jan 2021 · continuation
Priority: 17 Oct 2017
Published: US 2021/0146141 A120 May 2021
Granted: 29 Nov 2022
Term ends: Not estimatedThe source records don’t support an estimate.

Classification33 codes

A61N 1/36521
Controlled by a physiological quantity other than heart potential, e.g. blood pressure: the parameter being derived from measurement of an…
A61B 5/0816
Measuring devices for evaluating the respiratory organs: measuring devices for examining respiratory frequency
A61B 5/1116
Measuring movement of the entire body or parts thereof, e.g. head or hand tremor or mobility of a limb: determining posture transitions
A61B 5/1118
Measuring movement of the entire body or parts thereof, e.g. head or hand tremor or mobility of a limb: determining activity level

Family

Application62/573,436Us provisional application · filed 17 Oct 2017
Application16/161,534Parent of this continuation · filed 16 Oct 2018
US 2021/0146141 A1Pre-grant publication · published 20 May 2021
US 10,898,720 B2Parent of this continuation
US 2019/0111268 A1Published application
US 11,511,119 B2This patent

From the US filing history. Foreign family members aren’t listed.