Utilization of electrode spatial arrangements for characterizing cardiac conduction conditions

Patent metadata

Field	Value
Publication number	US-9808171-B2
Application number	US-201414782134-A
Country	US
Kind code	B2
Filing date	May 7, 2014
Priority date	May 7, 2013
Publication date	Nov 7, 2017
Grant date	Nov 7, 2017

Abstract

A system and method are provided for determining electrophysiological data. The system comprises an electronic control unit that is configured to receive electrical signals from a set of electrodes, receive position and orientation data for the set of electrodes from a mapping system, compensate for position and orientation artifacts of the set of electrodes, compose cliques of a subset of neighboring electrodes in the set of electrodes, determine catheter orientation independent information of a target tissue, and output the orientation independent information to a display. The method comprising receiving electrogram data for a set of electrodes ( 80 ), compensating for artifacts in sensor positions in the mapping system ( 81 ), resolving the bipolar signals into a 3D vector electrogram in the mapping system coordinates ( 82 ), manipulating observed unipolar voltage signals and the tangent component of the e-field to estimate the conduction velocity vector ( 83 ), and outputting the catheter orientation independent information ( 84 ).

First claim

What is claimed is:

1. A system for determining electrophysiological data, comprising:
an electronic control unit configured to:
receive electrogram data for a set of electrodes,
compose a clique of at least three neighboring electrodes from the set of electrodes, wherein the electrogram data comprises a plurality of bipole signals taken between the at least three neighboring electrodes in the clique;
receive position and orientation information for the set of electrodes from a mapping system;
derive an E-field from the plurality of bipole signals of the clique, wherein bipole signals taken between the at least three neighboring electrodes in the clique overdetermine the E-field;
determine catheter orientation independent information of a tissue based on the electrogram data and position and orientation information from the set of electrodes, wherein the catheter orientation independent information comprises a local tangent E-field and an orthogonal unit vector in the direction along which a wavefront is propagating (a); and
output the orientation independent information to a user or process.

2. The system according to claim 1 , wherein the orientation independent information further comprises at least one of a 2D vector electric field, a 3D vector electric field, a normal electric field, the eccentricity of the tangent electric field loop, derived normal and tangent bipolar electrogram signals, a wavefront conduction velocity, or a unit direction vector.

3. The system according to claim 1 , wherein the electronic control unit is further configured to compensate for artifacts in the position and orientation information received from the mapping system.

4. The system according to claim 1 , wherein the electronic control unit is further configured to resolve the electrogram data into a 3D vector electrogram in a coordinate system of the mapping system.

5. The system according to claim 1 , wherein the catheter orientation independent information further comprises a wavefront conduction velocity and a 2D vector electric field.

6. The system according to claim 1 , wherein the electronic control unit is further configured to resolve the electrogram data into a 2D vector electrogram in a coordinate system of the mapping system.

7. The system according to claim 6 , wherein the catheter orientation independent information further comprises a conduction velocity magnitude.

8. The system according to claim 1 , wherein the orientation independent information further comprises a single phase positive waveform.

9. The system according to claim 1 , wherein the orientation independent information further comprises a local estimate of the conduction velocity vector.

10. The system according to claim 9 , wherein the local estimate of the conduction velocity vector occurs on a beat-by-beat basis.

11. A system for determining electrophysiological data, comprising:
an electronic control unit configured to:
receive electrical signals from a set of electrodes;
receive position and orientation data for the set of electrodes from a mapping system;
compensate for position and orientation artifacts of the set of electrodes;
compose cliques of a subset of neighboring electrodes in the set of electrodes, wherein each of the cliques comprise at least three electrodes, wherein the electrical signals comprise a plurality of bipole signals taken between the at least three neighboring electrodes in each of the cliques;
derive an E-field for a tissue adjacent to each of the cliques from the plurality of bipole signals, wherein bipole signals taken between the at least three neighboring electrodes in each of the cliques overdetermine the E-field for the tissue adjacent that clique;
determine catheter orientation independent information of a target tissue based on the electrogram data and position and orientation information from the set of electrodes, wherein the catheter orientation independent information comprises a local tangent E-field and an orthogonal unit vector in the direction along which a wavefront is propagating (a); and
output the orientation independent information to a display.

12. The system according to claim 11 , wherein the orientation independent information further comprises a local estimate of the conduction velocity vector.

13. The system according to claim 11 , wherein the electronic control unit is further configured to resolve the electrogram data into a 2D vector electrogram in a coordinate system of the mapping system.

14. The system according to claim 13 , wherein the electrical signals comprises at least one planar electrode bipolar signal.

15. A method of determining electrophysiological data, comprising:
receiving electrogram data for a set of electrodes,
composing a clique of at least three neighboring electrodes from the set of electrodes, wherein the electrogram data comprises a plurality of bipole signals taken between the at least three neighboring electrodes in the clique;
receiving position and orientation information for the set of electrodes from a mapping system;
deriving an E-field from the plurality of bipole signals, wherein bipole signals taken between the at least three neighboring electrodes in the clique overdetermine the E-field;
determining catheter orientation independent information of a tissue based on the electrogram data and position and orientation information from the set of electrodes, wherein the catheter orientation independent information comprises a local tangent E-field and an orthogonal unit vector in the direction along which a wavefront is propagating (a); and
outputting the orientation independent information to a user or process.

16. The method according to claim 15 , wherein the orientation independent information further comprises at least one of a 2D vector electric field, a 3D vector electric field, a normal electric field, the eccentricity of the tangent electric field loop, derived normal and tangent bipolar electrogram signals, a wavefront conduction velocity, or a unit direction vector.

17. The method according to claim 15 further comprising compensating for artifacts in the position and orientation information received from the mapping system.

18. The method according to claim 15 further comprising resolving the electrogram data into a 3D vector electrogram in a coordinate system of the mapping system.

19. The method according to claim 15 , wherein the orientation independent information further comprises a local estimate of the conduction velocity vector.

20. The method according to claim 19 , wherein the local estimate of the conduction velocity vector occurs on a beat-by-beat basis.

Assignees

• St Jude Medical Atrial Fibrillation Div Inc

Inventors

• Balachandran Ram K
• Deno D Curtis

Classifications

• A61B2017/00053

  Mapping · CPC title

• A61B2218/002

  Irrigation · CPC title

• A61B2017/00044

  Sensing electrocardiography, i.e. ECG · CPC title

• A61B34/20

  Surgical navigation systems; Devices for tracking or guiding surgical instruments, e.g. for frameless stereotaxis · CPC title

• A61B2034/2051

  Electromagnetic tracking systems · CPC title