Method of positioning electrodes for central nervous system monitoring and sensing pain reactions of a patient

• US 7,130,673 B2
• Filed: 04/08/2003
• Issued: 10/31/2006
• Est. Priority Date: 04/08/2003
• Status: Expired due to Term

• Current Assignee: GE Healthcare Finland OY (GE Healthcare Technologies, Inc.)
• Original Assignee: Instrumentarium Dental Incorporated (Envista Holdings Corporation)
• Inventors: Viertiö-Oja, Hanna, Tolvanen-Laakso, Heli, Paloheimo, Markku
• Primary Examiner(s): Cohen, Lee S.
• Application Number:
  US10/409,679
• Publication Number:
  US 20040204656A1
• Time in Patent Office: 1,302 Days
• Field of Search: 600/383, 600/393, 600/544, 600/546
• US Class Current: 600/383
• CPC Class Codes: A61B 5/1106 to assess neuromuscular blockade, e.g. to estimate depth of anaesthesia
• CPC Class Codes: A61B 5/291 for electroencephalography [EEG]
• CPC Class Codes: A61B 5/296 for electromyography [EMG]
• CPC Class Codes: A61B 5/4821 Determining level or depth of anaesthesia A61B5/1106 takes precedence
• CPC Class Codes: A61B 5/6814 Head

Abstract

A method concerning measurements by using an electrode array comprising three electrodes for central nervous system (CNS) monitoring from the forehead of a patient'"'"'s head. A first electrode of said three electrodes is positioned between the eyebrows or immediately above the eyebrows of the patient. A third electrode of said three electrodes is positioned apart from the first electrode on the hairless fronto-lateral area of the forehead the patient. A second electrode is positioned between the first and the third electrodes on the forehead of the patient.

Claims

1. Method of positioning electrodes in an electrode array consisting of three electrodes for central nervous system (CNS) monitoring from the forehead of a patient'"'"'s head, said method comprising the steps of:

positioning a first electrode of said three electrodes between the eyebrows or above the eyebrows near frontalis and orbicularis muscles of the patient;

positioning a third electrode of said three electrodes apart from the first electrode on the hairless fronto-lateral area of the frontal lobe of the patient; and

positioning a second electrode between the first and the third electrodes on the forehead of the patient.

2. The method of claim 1, in which the first and the third electrodes are measuring electrodes and the second electrode is a ground electrode.

3. The method of claim 2, in which the second electrode is positioned essentially in the middle of the first and the third electrodes having essentially the same distance to said first and third electrodes.

4. The method of claim 2, in which the positioning of the first and the third electrodes enables the first and third electrodes to obtain electroencephalography (BEG) signals.

5. The method of claim 4 in which the positioning of the first electrode enables the first electrode to obtain mainly frontal electromyography (FEMG) signals when the patient is awake or the patient feels pain.

6. The method of claim 4 in which the positioning of the third electrode enables the third electrode to obtain mainly electroencephalography (EEG) signals from the fronto-lateral area of the forehead.

7. The method of claim 1, in which the second electrode is positioned essentially in the middle of the first and the third electrodes having essentially the same distance to said first and third electrodes.

8. The method of claim 7, in which the positioning of the first and the third electrodes enables the first and third electrodes to obtain electroencephalography (EEG) signals.

9. The method of claim 8 in which the positioning of the first electrode enables the first electrode to obtain mainly frontal electromyography (FEMG) signals when the patient is awake or the patient feels pain.

10. The method of claim 8 in which the positioning of the third electrode enables the third electrode to obtain mainly electroencephalography (EEG) signals from the fronto-lateral area of the forehead.

11. The method of claim 1, in which the positioning of the first and the third electrodes enables the first and third electrodes to obtain electroencephalography (EEG) signals.

12. The method of claim 11, in which the positioning of the first electrode enables the first electrode to obtain mainly frontal electromyography (FEMG) signals when the patient is awake or the patient feels pain.

13. The method of claim 11, in which the positioning of the third electrode enables the third electrode to obtain mainly electroencephalography (EEG) signals from the fronto-lateral area of the forehead.

14. The method of claim 1, further comprising the step of positioning at least one additional electrode separate from said three electrode array on the area surrounding the eye of the patient to monitor the movements of the eye.

15. The method of claim 14, in which two additional electrodes are used.

16. The method of claim 15, in which the additional electrodes are positioned above or/and under the eye or/and adjacent to the eye.

17. The method of claim 14, in which the additional electrodes are positioned above or/and under the eye or/and adjacent to the eye.