Electrophysiology filtering system

• US 5,706,823 A
• Filed: 08/12/1996
• Issued: 01/13/1998
• Est. Priority Date: 08/18/1995
• Status: Expired due to Term

• Current Assignee: Quinton, Inc. (Pfizer Inc.)
• Original Assignee: Quinton Instrument Co. (Cardica Incorporated)
• Inventors: Wodlinger, Harold Max
• Primary Examiner(s): Cohen, Lee S.
• Application Number:
  US08/695,484
• Time in Patent Office: 519 Days
• Field of Search: 606/32, 606/34, 606/40, 606/41, 606/49, 607/98, 607/99, 607/122, 128/642, 128/696, 128/710
• US Class Current: 600/509
• CPC Class Codes: A61B 5/30 Input circuits therefor
• CPC Class Codes: A61B 5/307 specially adapted for particular uses
• CPC Class Codes: A61B 5/7217 of noise originating from a therapeutic or surgical apparatus, e.g. from a pacemaker

Abstract

A versatile electrophysiology system including an amplification system, an ablation machine, a filter box, a display monitor and a chart recorder as well as an optional data management and analysis system wherein the amplification system receives endocardial signals from an ablation catheter during both the electrophysiology study and the ablation procedure and wherein the amplification system, ablation machine and ablation catheter are interconnected with the filter box such that the endocardial signals and the high energy ablation signal pass therethrough and are filtered thereby.

Claims

1. An electrophysiology system for monitoring the physiological data of a patient from an electrophysiology study and performing an ablation procedure, the system comprising:

an amplification system for receiving and amplifying endocardial data from a patient;

an ablation machine for generating an energy signal to ablate portions of a heart in accordance with said endocardial data;

an ablation catheter for delivery of the energy signal to the heart of the patient and to provide endocardial data from the heart of the patient to the amplification system; and

a filter box interconnected with said amplification system, said ablation machine and said ablation catheter and having a filter array therein to filter said endocardial data for use by said amplification system while said energy signal is generated by said ablation machine and applied to the heart of a patient through said ablation catheter and while said energy signal is not applied to the heart of the patient.

2. The system of claim 1 wherein said amplification system includes a monitor associated therewith to provide a display of the physiological data received from the patient.

3. The system of claim 1 wherein said filter box includes a passive filter therein.

4. The system of claim 1 wherein said filter box includes a first filter member having an impedance less than about 1 ohm at approximately 500 kHz therein.

5. The system of claim 1 wherein said filter box includes a filter member having an impedance greater than about 3000 ohms at approximately 500 kHz therein.

6. The system of claim 1 wherein said filter box includes a patient side and an ablation machine side and said filter array results in a filter pole between about 5000 and 10000 ohms as measured from the patient side of said filter box.

7. The system of claim 1 wherein said filter array blocks the noise generated by said ablation machine which is generally within the same frequency range as the endocardial data from the patient.

8. The system of claim 1 wherein said amplification system includes further filters therein to filter the signal received by said amplification system from said filter box to provide a signal which is representative of the endocardial data received from the patient by said ablation catheter.

9. The system of claim 1 wherein said filter box includes a patient side and an ablation machine side and said filter box includes a first filter member having an impedance less than about 1 ohm at approximately 500 kHz and a second filter member having an impedance greater than about 3000 ohms at approximately 500 kHz and said filter array of said filter box has a filter pole between about 5000 and 10000 Hz as measured from said patient side of said filter box.

10. The system of claim 1 further including a chart recorder for printing the physiological data from the patient and a display system including a display monitor wherein said chart recorder and said display monitor are independently configurable through said amplification system.

11. The system of claim 1 further including a separate data management system operatively connected to said amplification system and a display system which includes a real time display monitor operatively associated therewith and the operation of said monitor and said data management system being in response to command signals received from said amplification system.

12. The system of claim 1 further including a separate chart recorder operatively connected thereto and a display system which includes a real time display monitor operatively associated therewith and the operation of said monitor and said chart recorder being in response to command signals received from said amplification system.

13. The system of claim 1 further including a passive filter in said filter box and at least one low pass filter in said amplification system.

14. The system of claim 1 including a single pole type of filter in said filter box and at least one low pass filter in said amplification system.

15. The system of claim 1 including said filter array which provides an impedance of less than 1 ohm at approximately 500 kHz to said energy signal generated by said ablation machine and which blocks in band noise generated by said ablation machine that is in the same frequency range as the endocardial data generated by the heart of the patient.

16. The system of claim 1 further including a filter member having a high impedance to ground at the frequencies at which said energy signal is generated by said ablation machine.

17. The system of claim 1 further including a plurality of filters in said amplification system wherein said plurality of filters include adjustable high and low pass and notch filters.

18. An electrophysiology system for monitoring the physiological data of a patient from an electrophysiology study and an ablation procedure,said system including an amplification system for amplifying the physiological signals received from the body of the patient, an ablation machine for generating a high energy ablation signal, an ablation catheter for delivering said ablation signal to a location inside the heart of a patient and receiving endocardial signals from the heart of the patient and a filter box operatively connected to said amplification system, said ablation machine and said ablation catheter, said filter box including:

an interface means for interfacing with the endocardial signals received from said ablation catheter and supplying said endocardial signals to said amplification system, said interface means including filters therein and further receiving said ablation signal from said ablation machine and transferring said ablation signal to said ablation catheter while allowing said endocardial signals to be received by said amplification system during an electrophysiology study and an ablation procedure without modification thereof.

19. The system of claim 18 wherein said endocardial signals are received by said interface means and said amplification system in parallel.

20. The system of claim 18 wherein said interface means includes a single pole passive filter therein.

21. The system of claim 18 wherein said interface means includes a plurality of capacitors therein to provide an impedance of less than 1 ohm to said ablation signal therein.

22. The system of claim 18 wherein said interface means includes an inductor therein having an impedance greater than 3000 ohms to ground at the frequencies at which said ablation signal is generated by said ablation machine.

23. The system of claim 18 wherein said interface means includes an ablation machine side and said interface means includes a filter pole therein to block the in band noise from said ablation machine on said ablation machine side of said interface means.

24. The system of claim 18 wherein said interface means includes an amplification system side and said interface means includes a filter pole therein to block the endocardial signals from said ablation catheter on said amplification system side of said interface means and to allow said endocardial signals to be received by said amplification system.

25. A method of performing an electrophysiology study and ablation procedure using an electrophysiology system including an ablation machine, an ablation catheter, a filter box having a patient side and an ablation machine side and an amplification system to receive endocardial signals during the electrophysiology study and the ablation procedure, said method including

passing an ablation signal generated by the ablation machine through the filter box and ablation catheter to the patient,

blocking the in band noise generated by the ablation machine on the ablation machine side of the filter box while also blocking the endocardial signals on the patient side of the filter box, and

processing the endocardial signals in the amplification system.

26. The method of claim 25 including the step of passing the ablation signal through a filter pole formed by the components of the filter box between about 5000 Hz and 10000 Hz to block the in band noise generated by the ablation machine.

27. The method of claim 25 including the step of passing the endocardial signals from the ablation catheter to the amplification system through a parallel connection.

28. The method of claim 25 including the step of filtering the endocardial signals in the amplification system using a low pass filter.

29. The method of claim 25 including the step of providing a passive filter in the filter box to provide a low impedance to the passage of the ablation signal therethrough.

30. The method of claim 25 wherein the ablation signal is an energy signal generated by the ablation machine and the method further includes the step of providing a passive filter in the filter box to provide an impedance to the passage of the ablation signal therethrough which is less than one percent of the energy generated by the ablation signal of the ablation machine.

31. The method of claim 25 including the step of passing the ablation signal through a filter member having an impedance greater than about 3000 ohms at approximately 500 kHz.

32. The method of claim 25 including the step of continuously processing the endocardial signals in the amplification system during the electrophysiology study and the ablation procedure.