Systems and methods for orientation independent sensing

Patent metadata

Field	Value
Publication number	US-2021267693-A1
Application number	US-202117200382-A
Country	US
Kind code	A1
Filing date	Mar 12, 2021
Priority date	May 12, 2015
Publication date	Sep 2, 2021
Grant date	—

Abstract

A system and method for obtaining an OIS coordinate frame comprising an electronic control unit configured to determine a local 3D electric field loop, create a zero mean version of E(t) over a depolarization interval, compute an Ė value at each of a plurality of time intervals, compute an initial estimate of ŵ from a cross product of E and the Ė value for each of the plurality of time intervals, average the initial estimate of ŵ from each of the plurality of time for a best estimate of ŵ, determine a plurality of â(θ) values and using the corresponding {circumflex over (n)}(θ) values, compute a composite match score, and choose at least one best value for â and a best value for {circumflex over (n)}.

First claim

1 .- 20 . (canceled)

21 . A system for analyzing signal quality of a plurality of electrodes in contact with a surface of a heart, the system comprising:
an electronic control unit configured to: acquire electrophysiology signals from a plurality of electrodes; select at least one clique of electrodes from the plurality of electrodes; process the electrophysiology signals from the at least one clique to derive a plurality of local E field data points associated with the at least one clique of electrodes; and analyze the E field data points associated with the at least one clique of electrodes to determine whether a quality of the electrophysiology signals is affected.

22 . The system according to claim 21 , wherein, in analyzing the E field data points associated with the at least one clique of electrodes to determine whether the quality of the electrophysiology signals is affected, the electronic control unit is further configured to analyze a morphology of the electrophysiology signals or determine a peak-to-peak amplitude ratio of E w /E span .

23 . The system according to claim 21 , wherein, in analyzing the E field data points associated with the at least one clique of electrodes to determine whether the quality of the electrophysiology signals is affected, the electronic control unit is further configured to determine a cross correlation lag between E a and {dot over (φ)}.

24 . The system according to claim 23 , wherein the electronic control unit is further configured to determine whether the cross correlation lag is less than 5 ms.

25 . The system according to claim 21 , wherein, in analyzing the E field data points associated with the at least one clique of electrodes to determine whether the quality of the electrophysiology signals is affected, the electronic control unit is further configured to determine a conduction velocity of a tissue adjacent the at least one clique of electrodes.

26 . The system according to claim 25 , wherein the electronic control unit is further configured to compare the conduction velocity of the tissue to a physiologically plausible conduction velocity to determine a state of the tissue.

27 . The system according to claim 25 , wherein the state of the tissue comprises healthy tissue.

28 . The system according to claim 21 , wherein the system further comprises:
a model construction system configured to obtain a geometry surface model of a cardiac surface of the heart; and wherein the electronic control unit is further configured to determine whether an error in geometric modeling of the cardiac surface has affected the quality of the electrophysiology signals.

29 . The system according to claim 28 , wherein, in analyzing the E field data points associated with the at least one clique of electrodes to determine whether the quality of the electrophysiology signals is affected, the electronic control unit is further configured to determine a catheter force related surface distension of the cardiac surface.

30 . The system according to claim 21 , wherein the system is configured to determine whether an artifact is present affecting the quality of the electrophysiology signals.

31 . The system according to claim 30 , wherein the artifact comprises a far field artifact.

32 . The system according to claim 21 , wherein determining whether the quality of the electrophysiology signals is affected comprises comparing an E span value against a threshold.

33 . The system according to claim 21 , wherein the electronic control unit is further configured to:
derive at least one orientation independent signal from the at least one clique of electrodes; and output catheter orientation independent electrophysiologic information to a user or process.

34 . The system according to claim 33 , wherein the at least one orientation independent signal comprises one of an instantaneous conduction velocity vector and an index of an inhomogeneous conduction derived from E w or the eccentricity of E t .

35 . The system according to claim 21 , wherein the system further comprises:
a model construction system configured to obtain a geometry surface model of a cardiac surface; and wherein the electronic control unit is further configured to determine whether an error in geometric modeling of the cardiac surface has affected the quality of the electrophysiology signals.

36 . The system according to claim 35 , wherein in analyzing the E field data points associated with the at least one clique of electrodes to determine whether the quality of the electrophysiology signals is affected comprises detecting a catheter force related surface distension of a cardiac surface.

37 . The system according to claim 21 , wherein each of the at least one clique of electrodes comprises a unipole clique electrode.

38 . The system according to claim 21 , wherein determining whether the quality of the electrophysiology signals is affected comprises comparing a relative timing of all unipolar clique electrodes.

39 . The system according to claim 21 , wherein determining whether the quality of the electrophysiology signals is affected comprises comparing a timing of E n or E a to that of a surface QRS signal.

40 . A method for analyzing signal quality of a plurality of electrodes in contact with a surface of a heart, comprising:
acquiring electrophysiology signals from a plurality of electrodes; selecting at least one clique of electrodes from the plurality of electrodes; processing the electrophysiology signals from the at least one clique to derive a plurality of local E field data points associated with the at least one clique of electrodes; and analyzing the E field data points associated with the at least one clique of electrodes to determine whether an artifact is present affecting a quality of the electrophysiology signals.

Assignees

• St Jude Medical Cardiology Div Inc

Inventors

• Deno D Curtis
• Balachandran Ram K
• Massé Stéphane

Classifications

• A61B5/7221 Primary

  Determining signal validity, reliability or quality (preventing, reducing or removing noise induced by motion artefacts A61B5/7207; noise originating from a therapeutic or surgical apparatus A61B5/7217) · CPC title

• A61B5/287

  Holders for multiple electrodes, e.g. electrode catheters for electrophysiological study [EPS] · CPC title

• A61B2034/2053

  Tracking an applied voltage gradient · CPC title

• A61B2018/00267

  having a basket shaped structure · CPC title

• A61B5/316

  Modalities, i.e. specific diagnostic methods · CPC title