Real-time graphic display of heat lesioning parameters in a clinical lesion generator system

• US 5,233,515 A
• Filed: 06/08/1990
• Issued: 08/03/1993
• Est. Priority Date: 06/08/1990
• Status: Expired due to Term

• Current Assignee: Covidien AG (Medtronic Plc)
• Original Assignee: Eric R. Cosman
• Inventors: Cosman, Eric R.
• Primary Examiner(s): Envall, Jr., Roy N.
• Assistant Examiner(s): BODENDORF, ANDREW
• Application Number:
  US07/535,733
• Time in Patent Office: 1,152 Days
• Field of Search: 128/734, 128/736, 128/784, 128/785, 128/804, 128/660.02, 128/660.06, 364/413.02, 364/413.01, 364/413.06, 364/413.09, 606/34
• US Class Current: 600/549
• CPC Class Codes: A61B 18/12 by passing a current through the tissue to be heated, e.g. high-frequency current
• CPC Class Codes: A61B 18/1206 Generators therefor
• CPC Class Codes: A61B 2017/00084 Temperature
• CPC Class Codes: A61B 2018/0066 without feedback, i.e. open loop control
• CPC Class Codes: A61B 5/283 Invasive
• CPC Class Codes: A61M 2230/04 Heartbeat characteristics, e.g. ECG, blood pressure modulation
• CPC Class Codes: G16H 40/63 for local operation
• CPC Class Codes: G16Z 99/00 Subject matter not provided for in other main groups of this subclass

Abstract

A real-time graphic display of heat lesioning parameters in a clinical lesion generator is disclosed. The graphic display provides a display of heat lesioning parameters such as, impedance, temperature, power current, voltage as well as the change or alteration of various physiologic parameters such as, ECG, as a function of time during the course of the lesion process and for a time before and after the process. Benchmark values for these parameters can be set to provide visual references on the graphic display.

Claims

1. An apparatus for making and monitoring the course of a heat lesion in living bodily tissues having real-time graphics display screen monitoring of the lesion parameters, the apparatus comprising:

(a) a controllable power source means which is adapted to be connected to an electrode that can be implanted into a living body so that the power from said controllable power source means can heat tissue near said electrode when it is implanted in the living body and with an increase in the amount of heating around said electrode producing a heat lesion in the living body;

(b) means for measuring electrical impedance of the tissue around said electrode when it is connected to said power source means;

(c) a real-time graphics display screen means for displaying the impedance measured by said impedance measuring means as a function o time during the course of producing the heat lesion in said living body.

2. The apparatus of claim 1 further comprising means for displaying ambient initial values of impedance on said real-time graphics display screen means.

3. The apparatus of claim 1 further comprising means for setting and displaying a predetermined value of impedance on said real-time graphics display screen means.

4. The apparatus of claim 1 wherein said electrode includes temperature sensing means, said apparatus and further comprising means for displaying an indication of the temperature sensed by said temperature sensing means in a graphics fashion on said real-time graphics display screen means.

5. The apparatus of claim 4 further comprising means graphically displaying predetermined values of temperature on said real-time graphics display screen means.

6. The apparatus of claim 5 further comprising means for setting and displaying a predetermined value of temperature on said real-time graphics display screen means.

7. The apparatus of claim 5 wherein at least some of said predetermined temperature values are 37 degrees centigrade and 100 degrees centigrade.

8. The apparatus of claim 1 further comprising means for displaying electrocardiographic signals from an ECG electrode on said real-time graphics display screen means.

9. The apparatus of claim 8 wherein said ECG electrode is the same as said implanted electrode.

10. The apparatus of claim 1 further comprising means for measuring ECG electrocardiographic signals from an ECG electrode and displaying the measured ECG signals on said real-time graphics display screen means together with said displayed measured impedance value.

11. The apparatus of claim 1 further comprising means for measuring the power from said controllable power source means and means for displaying on said real-time graphics display screen means an indication of the measured power.

12. The apparatus of claim 1 wherein said controllable power source means is a radiofrequency power source so that the heating from said electrode occurs by radiofrequency current heating in the tissue surrounding said electrode.

13. An apparatus for making heat lesions in the tissue of a living body with real-time graphics display capability of lesion parameters, said apparatus comprising:

a controllable power source means which is adapted to deliver power to an electrode implanted in the living body with the power from said controllable power source means heating the tissue around said electrode to produce a heat lesion in the living body;

(b) a temperature measuring means for measuring the temperature of tissue around said electrode when the electrode is heated by said controllable power source means;

(c) a real-time graphics display screen means for displaying the temperature measured by the temperature measuring means as a function of time during the course of producing the heat lesion process.

14. The apparatus of claim 13 further comprising means for graphically displaying predetermined values of temperature on said real-time graphics display screen means.

15. The apparatus of claim 13 further comprising means for setting and displaying a predetermined value of temperature on said real-time graphics display screen means.

16. The apparatus of claim 13 wherein said controllable power source means is a radiofrequency power source so that the heating from said electrode occurs by radiofrequency current heating in the tissue surrounding said electrode.

17. The apparatus of claim 13 further comprising means for displaying electrocardiographic signals from an ECG electrode on said real-time graphics display screen means together with said displayed measured temperature value whereby the operator can observe the physiologic effect on said ECG signal .

18. The apparatus of claim 17 wherein said ECG electrode is the same as said implanted electrode.

19. The apparatus of claim 14 wherein at least some of said predetermined temperature values are 37 degrees centigrade and 100 degrees centigrade.