Medical ablation catheter control

• US 6,955,674 B2
• Filed: 04/07/2003
• Issued: 10/18/2005
• Est. Priority Date: 04/11/2002
• Status: Expired due to Fees

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Eick, Olaf J., Feron, John C. M. J.
• Primary Examiner(s): Gibson, Roy D.
• Assistant Examiner(s): KASZTEJNA, MATTHEW JOHN
• Application Number:
  US10/407,905
• Publication Number:
  US 20040127894A1
• Time in Patent Office: 925 Days
• Field of Search: 606 32- 50
• US Class Current: 606/34
• 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 2017/00699 correcting for movement caused by respiration, e.g. by triggering
• CPC Class Codes: A61B 2017/00703 correcting for movement of heart, e.g. ECG-triggered
• CPC Class Codes: A61B 2018/00702 Power or energy
• CPC Class Codes: A61B 2018/00791 Temperature
• CPC Class Codes: A61B 2034/2051 Electromagnetic tracking systems
• CPC Class Codes: A61B 2034/2053 Tracking an applied voltage gradient
• CPC Class Codes: A61B 2034/2072 Reference field transducer attached to an instrument or patient
• CPC Class Codes: A61B 34/20 Surgical navigation systems; Devices for tracking or guiding surgical instruments, e.g. for frameless stereotaxis

Abstract

The control for an ablation catheter provides increased ablation catheter operation feedback and increased options for programmable control of the ablation catheter for clinicians. The control for an ablation catheter has a microcontroller containing memory, an input and output coupled to the microcontroller, a movement program, a comparison program, and an annunciating program. The movement program processes position information from the input to calculate ablation catheter movement. The comparison program compares ablation catheter movement to a predetermined control data.

Claims

1. A medical ablation catheter control structure, comprising:

a microcontroller containing memory;

an input coupled to the microcontroller, the input configured for receiving position information of an ablation catheter from an electronic position detection system;

an output coupled to the microcontroller;

the output configured for communicating ablation catheter movement;

a movement program residing in memory, the movement program processing position information from the input to calculate ablation catheter movement;

a comparison program residing in memory, the comparison program compares ablation catheter movement to a predetermined control data; and

,

an annunciating program means residing in memory and coupled to the output for indicating a spatial relationship between the ablation catheter and the predetermined control data and in the event that the spatial relation exceeds a threshold value for interrupting a source of ablative energy to the ablation catheter.

2. The medical ablation catheter control structure as in claim 1 further comprising,

a control program residing in memory, the control program determining when ablation catheter movement exceeds a predetermined movement range;

and,

a response program residing in memory and coupled to the output, the response program interrupting power to the ablation catheter when ablation catheter movement exceeds the predetermined movement range.

3. The medical ablation catheter control structure as in, claim 2 wherein interrupting power to the ablation catheter is accomplished in less than 500 ms after determining that movement has exceeded the predetermined value.

4. The cardiac ablation catheter control structure as in claim 2 wherein the control program comprises,

setting the predetermined movement range;

reading at a first time a first x axis coordinate, a first y axis coordinate, and a first z axis coordinate,

reading at a second time a second x axis coordinate, a second y axis coordinate, and a second z axis coordinate;

calculating a difference between the first x axis coordinate and the second x axis coordinate, the first y axis coordinate and the second y axis coordinate, and the first z axis coordinate and the second z axis coordinate;

comparing the difference with the predetermined movement range; and

,

deciding whether an ablation catheter has exceeded the predetermined movement range.

5. The cardiac ablation catheter control structure as in claim 4 wherein determining whether movement has exceeded the predetermined movement range is accomplished in less than 500 ms after movement has occurred.

6. The medical ablation catheter control structure as in claim 1 wherein ablation catheter movement includes ablation catheter velocity.

7. The medical ablation catheter control structure as in claim 2 further comprising a physiological movement program to establishing a physiological movement baseline.

8. The medical ablation catheter control structure as in claim 7 wherein the physiological movement program comprises,

recording physiological movement data over a period of time x coordinates, y coordinates and z coordinates while the ablation catheter position remains substantially unchanged;

processing physiological movement data to determine a physiological movement baseline; and

,

establishing physiological movement boundaries according to the physiological movement baseline.

9. The medical ablation catheter control structure as in claim 7 wherein the physiological movement baseline is used to calculate respiratory movement and heart movement.

10. A method for medical ablation catheter control, comprising:

positioning an ablation catheter;

monitoring distal position of the ablation catheter with an electronic position detection system that generates position information;

processing position information to calculate ablation catheter movement;

comparing ablation catheter movement relative to a predetermined control data set;

annunciating relation of ablation catheter movement to the predetermined control data; and

one of reducing and interrupting a source of energy the ablation catheter in the event that the catheter movement exceeds a threshold value.

11. The method as in claim 10 further comprising,

recording physiological movement data over a period of time x coordinates, y coordinates and z coordinates while the ablation catheter position remains substantially unchanged;

processing physiological movement data to determine a physiological movement baseline; and

,

establishing physiological movement boundaries according to the physiological movement baseline.

12. A method of controlling a medical electrophysiology mapping and ablation catheter, comprising:

positioning a medical mapping/ablation catheter within a portion of a heart;

monitoring a position of the catheter with an electronic position detection system that generates position information regarding a distal portion of the catheter;

processing position information to calculate catheter movement;

comparing catheter movement relative to a predetermined control data set;

annunciating relation of ablation catheter movement to the predetermined control data; and

one of reducing and interrupting a source of energy to the catheter in the event that the catheter movement exceeds a threshold value of said control data set.

13. A method according to claim 12, further comprising:

producing a warning signal in the event that the position of the distal portion of the catheter no longer is disposed within the portion of the heart.

14. A method according to claim 13, wherein the warning signal comprises at least one of:

an audible warning signal, a tactile warning signal, a visibly perceptible warning signal.

15. A method according to claim 12, further comprising:

producing a warning signal in the event that the position of the distal portion of the catheter fails to advance at a predetermined rate.

16. A method according to claim 15, wherein the warning signal comprises at least one of:

an audible warning signal, a tactile warning signal, a visibly perceptible warning signal.

17. A method according to claim 12, further comprising:

displaying both a heart rate and a breathing rate of a patient from based at least in part upon the calculated catheter movement.

18. A method according to claim 17, further comprising terminating an ablation energy delivery sequence to the catheter in the event that the heart rate decreases.

19. A method according to claim 12, wherein the step of reducing and interrupting a source of energy to the catheter comprises at least one of;

inserting a high impedance load intermediate at least two members of the group;

a high energy ablation generator, an indifferent electrode, a electrode localization system.