Systems and methods for orientation independent sensing

Patent metadata

Field	Value
Publication number	US-2016331471-A1
Application number	US-201615152496-A
Country	US
Kind code	A1
Filing date	May 11, 2016
Priority date	May 12, 2015
Publication date	Nov 17, 2016
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

What is claimed is:

1 . A system 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 choosing a corresponding {circumflex over (n)}(θ) value for each of the plurality of â(θ) values; compute a composite match score; and choose at least one best value for â and a best value for {circumflex over (n)}.

2 . The system of claim 1 , wherein the electronic control unit is further configured to compute at least one of OIS omnipole signals comprising E n , E a , and E w .

3 . The system of claim 2 , wherein the electronic control unit is further configured to compute at least one amplitude from the at least one OIS omnipole signals.

4 . The system of claim 3 , wherein the electronic control unit is further configured to compute a conduction velocity vector from the at least one OIS omnipole signals and the at least one amplitude.

5 . The system according to claim 1 , wherein the electronic control unit is further configured to filter all of a plurality of unipolar signals, a plurality of catheter bipoles, and the 3D E-field loop before determining the local 3D electric field loop and the OIS coordinate fame of {circumflex over (n)}, â, and ŵ.

6 . The system according to claim 1 , wherein the electronic control unit is further configured to determine a catheter force related surface distension through the best value for {circumflex over (n)}.

7 . The system according to claim 1 , wherein the electronic control unit is further configured to determine whether a high quality OIS signal is present within the local 3D electric field loop.

8 . The system according to claim 1 , wherein the electronic control unit is further configured to weight a plurality of points within the local 3D electric field loop.

9 . A method for obtaining an OIS coordinate frame, comprising:
determining a local 3D electric field loop; creating a zero mean version of E(t) over a depolarization interval; computing an Ė value at each of a plurality of time intervals; computing an initial estimate of ŵ from a cross product of E and the Ė value for each of the plurality of time intervals; averaging the initial estimate of ŵ from each of the plurality of time for a best estimate of ŵ; determining a plurality of â(θ) values and choosing a corresponding {circumflex over (n)}(θ) value for each of the plurality of â(θ) values; computing a composite match score; and choosing at least one best value for â and a best value for {circumflex over (n)}.

10 . The method of claim 9 , further comprising computing at least one of OIS omnipole signals comprising E n , E a , and E w .

11 . The method of claim 10 , further comprising computing at least one amplitude from the at least one OIS omnipole signals.

12 . The method of claim 11 , further comprising computing a conduction velocity vector from the at least one OIS omnipole signals and the at least one amplitude.

13 . The method according to claim 9 , further comprising filtering all of a plurality of unipolar signals, a plurality of catheter bipoles, and the 3D E-field loop before determining the local 3D electric field loop.

14 . The method according to claim 9 , wherein the electronic control unit is further configured to determine a catheter force related surface distension through the best value for {circumflex over (n)}.

15 . The method according to claim 9 , wherein the electronic control unit is further configured to determine whether a high quality OIS signal is present within the local 3D electric field loop.

16 . A system for obtaining an OIS coordinate frame, comprising:
an electronic control unit configured to: determine a local 3D electric field loop; compute a composite match score for how well {dot over (φ)} matches an inner product of E and â(θ) and −φ matches an inner product of E and {circumflex over (n)}; choose a best value for â and a best value for {circumflex over (n)}; and determine a value for ŵ by a right hand rule and a cross product ŵ={circumflex over (n)}×â.

17 . The system of claim 16 , wherein the electronic control unit is further configured to compute at least one of OIS omnipole signals comprising E n , E a , and E w .

18 . The system of claim 17 , wherein the electronic control unit is further configured to compute at least one amplitude from the at least one OIS omnipole signals.

19 . The system of claim 18 , wherein the electronic control unit is further configured to compute a conduction velocity vector from the at least one OIS omnipole signals and the at least one amplitude.

20 . The system according to claim 16 , wherein the electronic control unit is further configured to filter all of a plurality of unipolar signals, a plurality of catheter bipoles, and the 3D E-field loop before determining the local 3D electric field loop.

Assignees

• St Jude Medical Cardiology Div Inc

Inventors

• Deno D Curtis
• Balachandran Ram K
• Massé Stéphane

Classifications

• A61B2034/2053

  Tracking an applied voltage gradient · CPC title

• A61B34/20 Primary

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

• 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

• A61B2018/00267

  having a basket shaped structure · CPC title

• A61B5/6858

  with a distal basket, e.g. expandable basket · CPC title