Implantable medical device for treating neurological conditions including ECG sensing

• US 8,000,788 B2
• Filed: 04/27/2007
• Issued: 08/16/2011
• Est. Priority Date: 04/27/2007
• Status: Active Grant

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Werder, Jonathan C., Giftakis, Jonathon E., Graves, Nina M., Panken, Eric J.
• Primary Examiner(s): Layno; Carl H
• Assistant Examiner(s): MALAMUD, DEBORAH LESLIE
• Application Number:
  US11/796,382
• Publication Number:
  US 20080269842A1
• Time in Patent Office: 1,572 Days
• Field of Search: 607/9, 607 15- 18, 607/116, 607 4- 5, 607/1, 600/378
• US Class Current: 607/9
• CPC Class Codes: A61N 1/36082 Cognitive or psychiatric applications, e.g. dementia or Alzheimer's disease
• CPC Class Codes: A61N 1/36114 Cardiac control, e.g. by vagal stimulation stimulating the heart A61N1/362
• CPC Class Codes: A61N 1/36585 controlled by two or more physical parameters
• CPC Class Codes: A61N 1/37 Monitoring; Protecting
• CPC Class Codes: A61N 1/37512 Pacemakers
• CPC Class Codes: A61N 1/3756 Casings with electrodes thereon, e.g. leadless stimulators

Abstract

An implantable medical device such as an implantable pulse generator that includes EEG sensing for monitoring and treating neurological conditions, and leadless ECG sensing for monitoring cardiac signals. The device includes a connector block with provisions for cardiac leads which may be used/enabled when needed. If significant co-morbid cardiac events are observed in patients via the leadless ECG monitoring, then cardiac leads may be subsequently connected for therapeutic use.

Claims

1. A method comprising:

implanting into a patient a medical device having at least three leadless electrodes located on a housing of the medical device, a brain port, and a cardiac port, the medical device having a processor communicatively coupled to the cardiac port, the brain port, and the at least three leadless electrodes, each of the at least three leadless electrodes adapted for cardiac sensing;

implanting into the patient a brain lead having a proximal end coupled to the brain port and a distal end with at least one electrode, and implanting the distal end in the patient at a location to sense electrical signals from the patient'"'"'s brain;

disabling the cardiac port either before or after implantation of the device;

determining which of the at least three leadless electrodes will be used for cardiac monitoring and which of the at least three leadless electrodes will instead be used for brain signal monitoring;

enabling cardiac monitoring from two of the at least three leadless electrodes based on the determination;

enabling brain signal monitoring from one of the at least three leadless electrodes adapted for cardiac sensing but not enabled for cardiac monitoring based on the determination, the processor including sensing circuitry adapted to receive and process electrical signals received by the distal end of the brain lead and the one of the at least three leadless electrodes enabled for brain signal monitoring;

monitoring for the presence of cardiac events that may require cardiac therapy;

if no cardiac events that may require therapy are identified, maintaining cardiac monitoring using the two leadless electrodes; and

if a cardiac event that may require cardiac therapy is identified, enabling the cardiac port.

2. The method of claim 1 further comprising the step of, if a cardiac event that may require cardiac therapy is identified, coupling proximal ends of cardiac leads to the cardiac port and positioning distal ends of the leads in, or in close proximity to, the heart.

3. The method of claim 2 further comprising the step of, if a cardiac event that may require cardiac therapy is identified, disabling cardiac monitoring from the two leadless electrodes and enabling cardiac monitoring from the cardiac leads.

4. The method of claim 2 further comprising a step of, if a cardiac event that may require cardiac therapy is identified, selecting either the cardiac port or the two leadless electrodes for cardiac monitoring.

5. The method of claim 4 wherein if the cardiac port is selected, performing direct cardiac monitoring with the cardiac leads and, if required, delivering cardiac therapy with the cardiac leads.

6. The method of claim 5 further comprising a step of enabling brain state control of the delivered cardiac therapy.

7. The method of claim 4 wherein if the two leadless electrodes are selected, performing indirect cardiac monitoring with the two leadless electrodes and, if required, delivering cardiac therapy with the cardiac leads.

8. The method of claim 4 further comprising a step of defining cardiac therapy parameters before the step of selecting either the cardiac port or the two leadless electrodes for cardiac monitoring.

9. The method of claim 2 further comprising the step of delivering cardiac therapy with the cardiac leads.

10. The method of claim 1 wherein the processor also includes a pulse generator wherein the at least one electrode on the distal end of the brain lead is adapted to receive stimulating pulses from the pulse generator and deliver pulses to tissue in which the at least one electrode is implanted.

11. The method of claim 10 wherein the one of the at least three leadless electrodes not enabled for cardiac monitoring is a remote electrode coupled to the pulse generator.

12. The method of claim 11 wherein the remote electrode is a reference electrode.

13. The method of claim 11 wherein the remote electrode is an indifferent electrode.

14. The method of claim 13 wherein the at least one electrode may deliver monopolar stimulation.

15. The method of claim 10 further comprising a second electrode located at the distal end of the brain lead coupled to the pulse generator wherein the at least one electrode and the second electrode may deliver bipolar stimulation.

16. The method of claim 1, wherein determining which of the at least three leadless electrodes will be used for cardiac monitoring is based on a visual inspection of signals from the at least three leadless electrodes.

17. The method of claim 1, wherein determining which of the at least three leadless electrodes will be used for brain signal monitoring is based on a visual inspection of cardiac signals from the at least three leadless electrodes.

18. A method comprising:

implanting into a patient a medical device having a plurality of cardiac sensing electrodes and a brain port, the medical device having a processor communicatively coupled to the cardiac sensing electrodes and the brain port;

implanting into the patient a brain lead having a proximal end coupled to the brain port and a distal end with at least one electrode, and implanting the distal end in the patient at a location to sense electrical signals from the patient'"'"'s brain;

dividing the plurality of cardiac sensing electrodes for use between cardiac monitoring and brain monitoring;

enabling cardiac monitoring from two of the plurality of cardiac sensing electrodes based on the division of the plurality of cardiac sensing electrodes;

enabling brain signal monitoring from one of the plurality of cardiac sensing electrodes not enabled for cardiac monitoring based on the division of the plurality of cardiac sensing electrodes, the processor including sensing circuitry adapted to receive and process electrical signals received by the distal end of the brain lead and the one of the plurality of cardiac sensing electrodes enabled for brain signal monitoring; and

assessing the cardiac monitoring for the presence of cardiac events that may require cardiac therapy.

19. The method of claim 18, wherein the medical device further comprises a cardiac therapy port communicatively coupled to the processor, and further comprising the steps of disabling the cardiac therapy port either before or after implantation of the device, if no cardiac events that may require therapy are identified, maintain cardiac monitoring using the cardiac sensing port, if a cardiac event that may require cardiac therapy is identified, enabling the cardiac therapy port, and coupling proximal ends of cardiac leads to the cardiac therapy port after assessing the cardiac monitoring and positioning distal ends of the cardiac leads in, or in close proximity to, the patient'"'"'s heart, and delivering cardiac therapy with the cardiac leads.

20. The method of claim 18 wherein the processor also includes a pulse generator wherein the at least one electrode on the distal end of the brain lead is adapted to receive stimulating pulses from the pulse generator and deliver pulses to the at least one electrode.

21. The method of claim 20 wherein the cardiac sensing electrode enabled for brain signal monitoring is a remote, leadless electrode coupled to the pulse generator.

22. The method of claim 21 wherein the remote electrode is a reference electrode.

23. The method of claim 21 wherein the remote electrode is an indifferent electrode.

24. The method of claim 23 wherein the at least one electrode may deliver monopolar stimulation.

25. The method of claim 20 further comprising a second electrode located at the distal end of the brain lead coupled to the pulse generator wherein the at least one electrode and the second electrode may deliver bipolar stimulation.

26. The method of claim 18, wherein dividing the plurality of cardiac sensing electrodes for use between brain monitoring and cardiac monitoring is based on a visual inspection of signals from the plurality of cardiac sensing electrodes.

27. An apparatus for leadless acquisition of electrocardiographic data comprising:

a hermetically sealed implantable device including at least three leadless electrodes located on a housing of the medical device, a brain port, and a cardiac therapy port wherein each of the at least three leadless electrodes are adapted for cardiac sensing;

a brain lead having a proximal end coupled to the brain port, the brain lead having a distal end with at least one electrode configured to be implanted in a human at a location to sense electrical signals from the human'"'"'s brain;

a therapy module coupled to the cardiac therapy port for providing therapeutic output to the heart;

a processor in communication with the at least three leadless electrodes, the brain port, and the cardiac port; and

a non-transitory computer readable medium in communication with the processor, the computer readable medium comprising executable instructions for causing the processor to perform the following;

enable two of the at least three leadless electrodes for cardiac monitoring based on a post-implantation determination indicating which of the at least three leadless electrodes will be used for cardiac monitoring;

enable brain signal monitoring from one of the at least three leadless electrodes adapted for cardiac monitoring but not enabled for cardiac monitoring;

receive and process electrical signals received by the distal end of the brain lead and the one leadless electrode enabled for brain signal monitoring;

monitor for the presence of cardiac events that may require cardiac therapy, and

if no cardiac event that may require cardiac therapy is identified, maintain cardiac monitoring using the two leadless electrodes; and

if a cardiac event that may require cardiac therapy is identified, enable the cardiac therapy port so that cardiac leads may subsequently be coupled to the cardiac port.

28. The apparatus of claim 27 further comprising cardiac leads coupled to the cardiac therapy port.

29. The apparatus of claim 27 wherein the computer readable medium further comprises executable instructions for causing the processor to disable cardiac monitoring from the two leadless electrodes and enable cardiac monitoring from the cardiac leads, if a cardiac event that may require cardiac therapy is identified.

30. The apparatus of claim 27 wherein the computer readable medium further comprises executable instructions for causing the processor to select either the cardiac port or the two leadless electrodes for cardiac monitoring, if a cardiac event that may require cardiac therapy is identified.

31. The apparatus of claim 30 wherein the computer readable medium further comprises executable instructions for causing the processor to perform direct cardiac monitoring with the cardiac leads if the cardiac port is selected and, if required, deliver cardiac therapy with the cardiac leads.

32. The apparatus of claim 30 wherein the computer readable medium further comprises executable instructions for causing the processor to perform indirect cardiac monitoring with the two leadless electrodes if the two leadless electrodes are selected, and, if required, deliver cardiac therapy with the cardiac leads.

33. The apparatus of claim 27 wherein the computer readable medium further comprises executable instructions for causing the processor to enable brain state control of the delivered cardiac therapy.

34. The apparatus of claim 27 wherein the processor also includes a pulse generator wherein the at least one electrode on the distal end of the brain lead is adapted to receive stimulating pulses from the pulse generator and deliver pulses to the at least one electrode.

35. The apparatus of claim 34 further comprising a second electrode located at the distal end of the brain lead coupled to the pulse generator wherein the at least one electrode and the second electrode may deliver bipolar stimulation.

36. The apparatus of claim 34 wherein the one of the at least three leadless electrodes enabled for brain signal monitoring is a remote electrode coupled to the pulse generator.

37. The apparatus of claim 36 wherein the remote electrode is a reference electrode.

38. The apparatus of claim 36 wherein the remote electrode is an indifferent electrode.

39. The apparatus of claim 38 wherein the at least one electrode may deliver monopolar stimulation.

40. The apparatus of claim 27, wherein the computer readable medium further comprises executable instructions for causing the processor to receive a command indicating which of the at least three leadless electrodes will be used for cardiac monitoring and to enable the two of the at least three leadless electrodes based on the command.

41. An apparatus for leadless acquisition of electrocardiographic data comprising:

a hermetically sealed implantable device including at least three leadless electrodes located on a housing of the medical device and a brain port;

a brain lead having a proximal end coupled to the brain port, the brain lead having a distal end with at least one electrode configured to be implanted in a human at a location to sense electrical signals from the human'"'"'s brain;

a processor in communication with the at least three leadless electrodes and the brain port; and

a non-transitory computer readable medium in communication with the processor, the computer readable medium comprising executable instructions for causing the processor to perform the following;

enable two of the at least three leadless electrodes for cardiac monitoring based on a post-implantation determination indicating which of the at least three leadless electrodes will be used for cardiac monitoring;

enable brain signal monitoring from one of the at least three leadless electrodes adapted for cardiac monitoring but not enabled for cardiac monitoring;

receive and process electrical signals received by the distal end of the brain lead and the one leadless electrode enabled for brain signal monitoring; and

monitor for the presence of cardiac events that may require cardiac therapy.