METHOD AND SYSTEM FOR LOOP RECORDING WITH OVERLAPPING EVENTS

• US 20070255155A1
• Filed: 04/27/2006
• Published: 11/01/2007
• Est. Priority Date: 04/27/2006
• Status: Active Grant

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Carlson, David, Drew, Touby
• Granted Patent: US 7,610,083 B2
• Time in Patent Office: Days
• US Class Current: 600/523
• CPC Class Codes: A61B 2560/0481 in implanted apparatus
• CPC Class Codes: A61B 5/0028 Body tissue as transmission medium, i.e. transmission systems where the medium is the human body
• CPC Class Codes: A61B 5/0031 Implanted circuitry
• CPC Class Codes: A61B 5/1112 Global tracking of patients, e.g. by using GPS
• CPC Class Codes: A61B 5/335 using integrated circuit memory devices
• CPC Class Codes: A61B 5/363 Detecting tachycardia or bradycardia
• CPC Class Codes: A61B 5/369 Electroencephalography [EEG] devices for psychotechnics A61B5/16
• CPC Class Codes: A61B 5/384 Recording apparatus or displays specially adapted therefor
• CPC Class Codes: A61B 5/4094 Diagnosing or monitoring seizure diseases, e.g. epilepsy
• CPC Class Codes: A61B 5/7232 involving compression of the physiological signal, e.g. to extend the signal recording period
• CPC Class Codes: A61B 5/7435 Displaying user selection data, e.g. icons in a graphical user interface
• CPC Class Codes: A61N 1/36082 Cognitive or psychiatric applications, e.g. dementia or Alzheimer's disease

Abstract

A method and apparatus is provided for handling multiple loop recordings that result from events in a limited memory implantable device. The events may include various automatic and manual triggers. The method provides a mechanism for deciding the amount of information to store associated with each overlapping loop recording.

Claims

1. A method of handling multiple loop recording in an implantable device, the method comprising:

(a) monitoring a first signal set including first waveform data, the first waveform data associated with a physiologic condition;

(b) detecting a first event;

(c) initiating a first loop recording, the first loop recording activated by the first event, the first loop recording storing at least a portion of the waveform data of the first signal set;

(d) monitoring a second signal set including second waveform data;

(e) detecting a second event;

(f) determining if an overlap of data will occur between the first loop recording and a second loop recording associated with the second event; and

(g) based on the determination in (f), determining whether to initiate the second loop recording.

2. The method of claim 1, wherein the first signal set and the second signal set are the same.

3. The method of claim 1, wherein the first event comprises a first trigger, the first trigger including an electrocardiogram trigger.

4. The method of claim 1, wherein the first event comprises a first trigger, the first trigger including a seizure detection algorithm trigger.

5. The method of claim 1, wherein the first event comprises a first trigger, the first trigger including a manual trigger.

6. The method of claim 1, wherein the second event comprises a second trigger, the second trigger including an electrocardiogram trigger.

7. The method of claim 1, wherein the second event comprises a second trigger, the second trigger including a seizure detection algorithm trigger.

8. The method of claim 1, wherein the second event comprises a second trigger, the second trigger including a manual trigger.

9. The method of claim 1, wherein the first loop recording comprises a pre-event time and a post-event time.

10. The method of claim 9, wherein if an overlap of data will not occur as determined in (f), then initiating the second loop recording in (g).

11. The method of claim 9, wherein if an overlap of data will occur as determined in (f), then (g) further comprising:

(i) determining if the second event occurs while recording the post-event time of the first loop recording; and

if in (i) the second event occurs while recording the post-event time of the first loop recording, then

(ii) completing the first loop recording and not initiating the second loop recording.

12. The method of claim 9, wherein if an overlap of data will occur as determined in (f), then (g) further comprising:

(i) determining if the second event occurs after recording of the post-event time of the first loop recording; and

if in (i) the second event occurs after recording of the post-event time of the first loop recording, then

(ii) initiating the second loop recording after completion of the first loop recording.

13. The method of claim 12, wherein the first loop recording and the second loop recording are contiguous.

14. The method of claim 12, wherein the first loop recording and the second loop recording comprise substantially similar recording times.

15. An implantable medical device comprising:

(a) a first monitoring element that receives a first signal set associated with a physiologic condition;

(b) a second monitoring element that receives a second signal set;

(c) a storage medium; and

(d) a processing module coupled to the storage medium and programmed with computer-executable instructions for performing;

(i) detecting a first event;

(ii) initiating a first loop recording, the first loop recording activated by the first event, the first loop recording storing waveform data of the first signal set in the storage medium;

(iii) detecting a second event;

(iv) determining if an overlap of waveform data will occur between the first loop recording and a second loop recording associated with the second event; and

(v) based on the determination in (f), determining whether to initiate the second loop recording.

16. The method of claim 15, wherein the first loop recording comprises a pre-event time and a post-event time.

17. The method of claim 16, wherein if an overlap will occur as determined in (iv), then (v) further comprising:

(I) determining if the second event occurs while recording the post-event time of the first loop recording; and

if in (I) the second event occurs while recording the post-event time of the first loop recording, then

(II) completing the first loop recording and not initiating the second loop recording.

18. The method of claim 16, wherein if an overlap will occur as determined in (iv), then (v) further comprising:

(I) determining if the second event occurs after recording of the post-event time of the first loop recording; and

if in (I) the second event occurs after recording of the post-event time of the first loop recording, then

(II) initiating the second loop recording after completion of the first loop recording.

19. A method of handling multiple loop recordings in an implantable device, the method comprising:

(a) detecting a first event associated with brain activity;

(b) initiating a first loop recording based on the detected first event, the first loop recording including a pre-event time and a post-event time;

(c) detecting a second event associated with heart activity; and

(d) determining whether to initiate a second loop recording associated with the second event.

20. The method of claim 19, wherein the brain activity comprises a seizure and the heart activity comprises a heart arrhythmia.