APPARATUS FOR MAGNETICALLY DEPLOYABLE CATHETER WITH MOSFET SENSOR AND METHOD FOR MAPPING AND ABLATION

• US 20090248014A1
• Filed: 06/08/2009
• Published: 10/01/2009
• Est. Priority Date: 02/23/2006
• Status: Abandoned Application

• Current Assignee: Neuro-Kinesis Corporation
• Original Assignee: Magnetecs Incorporated
• Inventors: Gang, Eli, Shachar, Yehoshua, Farkas, Laszlo
• Application Number:
  US12/480,566
• Publication Number:
  US 20090248014A1
• Time in Patent Office: Days
• US Class Current: 606/41
• CPC Class Codes: A61B 18/1492 having a flexible, catheter-like structure, e.g. for heart ablation A61B18/1477 takes precedence
• CPC Class Codes: A61B 2017/00026 Conductivity or impedance, e.g. of tissue
• CPC Class Codes: A61B 2017/0011 piezoelectric
• CPC Class Codes: A61B 2018/00214 Expandable means emitting energy, e.g. by elements carried thereon
• CPC Class Codes: A61B 2018/00839 Bioelectrical parameters, e.g. ECG, EEG
• CPC Class Codes: A61B 2018/1467 using more than two electrodes on a single probe
• CPC Class Codes: A61B 2018/183 characterised by the type of antenna
• CPC Class Codes: A61B 2034/2051 Electromagnetic tracking systems
• CPC Class Codes: A61B 2034/301 for introducing or steering flexible instruments inserted into the body, e.g. catheters or endoscopes
• CPC Class Codes: A61B 2034/742 Joysticks
• CPC Class Codes: A61B 34/20 Surgical navigation systems; Devices for tracking or guiding surgical instruments, e.g. for frameless stereotaxis
• CPC Class Codes: A61B 34/73 Manipulators for magnetic surgery
• CPC Class Codes: A61B 5/318 Heart-related electrical modalities, e.g. electrocardiography [ECG]
• CPC Class Codes: A61B 5/33 specially adapted for cooperation with other devices
• CPC Class Codes: A61B 5/7285 for synchronising or triggering a physiological measurement or image acquisition with a physiological event or waveform, e.g. an ECG signal A61B6/5205, A61B6/541, A61B8/5207, A61B8/543 take precedence
• CPC Class Codes: A61B 6/541 involving acquisition triggered by a physiological signal
• CPC Class Codes: A61B 8/543 involving acquisition triggered by a physiological signal

Abstract

A mapping and ablation catheter is described. In one embodiment, the catheter includes a MOSFET sensor array that provides better fidelity of the signal measurements as well as data collection and reduces the error generated by spatial distribution of the isotropic and anisotropic wavefronts. In one embodiment, the system maps the change in potential in the vicinity of an activation wavefront. In one embodiment, the mapping system tracks the spread of excitation in the heart, with properties such as propagation velocity changes. In one embodiment, during measurement, the manifold carrying the sensor array expands from a closed position state to a deployable open state. Spatial variation of the electrical potential is captured by the system'"'"'s ability to occupy the same three-dimensional coordinate set for repeated measurements of the desired site. In one embodiment, an interpolation algorithm tracks the electrogram data points to produce a map relative to the electrocardiogram data.

Claims

1. A catheterization method, comprising:

guiding a distal end of a catheter to a desired region of tissue;

spreading sensor arms of said catheter;

establishing contact between said sensor arms and the region of tissue;

sensing a position of said sensor arms;

measuring activation potential data using sensors provided to said sensor arms;

measuring impedance data of tissue between said sensor arms using contacts provided to said sensor arms; and

displaying a map of activation potential and impedance of said region of tissue.

2. The method of claim 1, further comprising using said activation potential data and said impedance data in a calculation to predict an RF ablation lesion.

3. The method of claim 2, further comprising creating an RF ablation lesion.

4. The method of claim 1, wherein said sensors comprise MOSFET sensors.

5. The method of claim 1, wherein said contacts comprise PN junctions.

6. The method of claim 1, wherein said contacts comprise alternating PN junctions.

7. The method of claim 1, further comprising calculating an angle between an E vector and an energy vector in said region of tissue.

8. The method of claim 7, further comprising identifying anomalies in activation vector spreads where an angle between said E vector and said energy vector exceeds a threshold.

9. The method of claim 1, wherein said position of said sensor arms is measured using radar.

10. The method of claim 1, wherein said position of said sensor arms is measured using X-rays.

11. The method of claim 1, further comprising:

calculating a desired direction of movement for said distal end;

computing a magnetic field needed to produce said movement;

controlling a plurality of electric currents and pole positions to produce said magnetic field; and

measuring a location of said distal end.

12. The method of claim 1, further comprising controlling one or more electromagnets to produce said magnetic field.

13. The method of claim 1, further comprising simulating a magnetic field before creating said magnetic field.