Portable EEG electrode locator headgear

• US 6,381,481 B1
• Filed: 01/27/2000
• Issued: 04/30/2002
• Est. Priority Date: 02/05/1999
• Status: Expired due to Term

• Current Assignee: Advanced Brain Monitoring
• Original Assignee: Advanced Brain Monitoring
• Inventors: Berka, Christine, Levendowski, Daniel J., Konstantinovic, Zoran R.
• Primary Examiner(s): COHEN, LEE S
• Application Number:
  US09/492,380
• Time in Patent Office: 824 Days
• Field of Search: 600/383, 600/390, 600/393, 600/544, 602/139
• US Class Current: 600/383
• CPC Class Codes: A61B 5/291 for electroencephalography [EEG]
• CPC Class Codes: A61B 5/6803 Head-worn items, e.g. helmets, masks, headphones or goggles
• CPC Class Codes: A61B 5/6804 Garments; Clothes

Abstract

The EEG electrode locator headgear allows the user to locate and apply disposable EEG electrodes accurately according to the International 10/20 System without technical assistance, to allow the acquisition of high quality EEG signals. The headgear includes a front forehead pad, a base strap assembly connected to the front forehead pad, a plurality of EEG electrode locators for receiving EEG electrodes, and a plurality of locator straps connected to the front pad of material, the base strap assembly, and to the plurality of EEG electrode locators for accurately positioning the plurality of EEG electrode locators positioned relative to the scalp of a user. A visor can be attached to the front pad of material, and the base strap assembly may include an occipital locator device. A plunger assembly with spreadable fingers for optionally parting the hair of the user'"'"'s scalp is also provided that is inserted in the electrode locators to optionally prepare the user'"'"'s scalp and to seat the electrodes. In one embodiment, a spreader portion of the plunger assembly is formed of electrically conductive material, such as electrically conductive silicone. An elastic, stretchable cap portion may also be connected to the EEG electrode locators, for biasing the plurality of electrode locators toward the user'"'"'s scalp.

Claims

1. An electroencephalograph (EEG) electrode locator headgear, comprising:

a base strap assembly adapted to be secured comfortably around the circumference of a user'"'"'s head;

an elastic, stretchable cap portion connected to said base strap assembly;

a plurality of EEG electrode locators mounted to said elastic, stretchable cap portion for accurately positioning said plurality of EEG electrode locators relative to the user'"'"'s scalp, and for biasing said plurality of electrode locators toward the user'"'"'s scalp; and

a plurality of EEG electrodes adapted to be received in and cooperate with said plurality of EEG electrode locators, respectively, each of said EEG electrodes including a plunger assembly adapted to prepare the user'"'"'s scalp and to seat the electrode in one of said EEG electrode locators, said plunger assembly including a plunger member having upper and lower portions, and said plunger assembly including an electrically conductive spreader member mounted to said lower portion of said plunger member, said spreader member having a plurality of flexible, resilient fingers having distal ends biased to meet at a common distal central location, and said flexible, resilient fingers being adapted to spread apart by exertion of downward pressure of said plunger assembly against the user'"'"'s scalp and to thereby part the hair of the user'"'"'s scalp.

2. The EEG electrode locator headgear of claim 1, wherein said plunger assembly is adapted to be inserted in the electrode locator to spread the distal flexible, resilient fingers.

3. The EEG electrode locator headgear of claim 1, wherein said plunger assembly comprises a cap connected to the upper portion of the plunger member.

4. The EEG electrode locator headgear of claim 1, wherein said spreader member comprises a cushion portion located between said flexible, resilient fingers adapted to rest against the user'"'"'s scalp after the electrode has been pressed downward to seat the electrode on the user'"'"'s scalp and spread the flexible, resilient fingers, to cushion the pressure of the electrode on the user'"'"'s scalp for additional comfort.

5. The EEG electrode locator headgear of claim 4, further comprising a conductive gel adapted to contact the user'"'"'s scalp, said conductive gel disposed adjacent to the cushion portion of the spreader member and between the flexible, resilient fingers.

6. The EEG electrode locator headgear of claim 1, wherein said plunger assembly comprises an electrical conductor mounted to said plunger member and electrically connected between said electrically conductive spreader member and said EEG electrode locator for conducting EEG signals from said electrode to an EEG monitor.

7. The EEG electrode locator headgear of claim 1, wherein said spreader member is formed of electrically conductive silicone.

8. The EEG electrode locator headgear of claim 1, wherein said elastic, stretchable cap portion comprises at least one elastic locator strap connected to said plurality of EEG electrode locators.

9. The EEG electrode locator headgear of claim 8, wherein said at least one elastic locator strap comprises a plurality of elastic locator straps.

10. The EEG electrode locator headgear of claim 9, wherein said plurality of locator straps are made of elastic material.

11. The EEG electrode locator headgear of claim 9, wherein said plurality of locator straps are formed of elasticized fabric.

12. The EEG electrode locator headgear of claim 1, wherein said elastic, stretchable cap portion comprises a stretch mesh cap of elastic, fabric material.

13. The EEG electrode locator headgear of claim 1, further comprising an outer cap shell disposed over said elastic, stretchable cap portion.

14. The EEG electrode locator headgear of claim 13, further comprising a Faraday shield attached to the outer cap shell to provide shielding against external noise and artifacts.

15. The EEG electrode locator headgear of claim 1, wherein said base strap assembly comprises a front pad of material having first and second ends, said front pad of material being adapted to extend across a user'"'"'s forehead, said base strap assembly having a first end connected to said first end of said front pad of material, and a second end connected to said second end of said front pad of material, said front pad of material and said base strap assembly being adapted to be secured comfortably around the circumference of a user'"'"'s head.

16. The EEG electrode locator headgear of claim 15, further comprising a visor attached to said front pad of material.

17. The EEG electrode locator headgear of claim 1, wherein said base strap assembly is adjustable.

18. The EEG electrode locator headgear of claim 15, wherein said base strap assembly comprises a pair of adjustable elastic straps connected at one end to said front pad of material and adjustably connected together at the other end.

19. The EEG electrode locator headgear of claim 15, wherein said base strap assembly further comprises an occipital locator device adapted to be seated on a region of the user'"'"'s scalp over the user'"'"'s occipital bone, said base strap assembly comprising first and second elastic edge straps connected at one end to said front pad of material, and adjustably connected at the other end to said occipital locator device.

20. The EEG electrode locator headgear of claim 1, wherein said plurality of EEG electrode locators each comprise a plurality of slots for receiving at least one locator strap.

21. The EEG electrode locator headgear of claim 1, wherein each of said electrode locators comprises an electrode locator electrical conductor adapted to be electrically connected to one of said EEG electrodes inserted in said electrode locator.

22. The EEG electrode locator headgear of claim 21, wherein said electrode locator electrical conductor comprises at least one electrical contact.

23. The EEG electrode locator headgear of claim 22, wherein each of said electrode locators comprises a circuit board base member mounted to said electrode locator electrical conductor, and wherein said at least one electrical contact is connected to said circuit board base member.

24. The EEG electrode locator headgear of claim 23, wherein said plunger assembly is adapted to be received in said circuit board base member of the electrode locator.

25. The EEG electrode locator headgear of claim 24, wherein the circuit board base member includes a spring detent, and said plunger member has a plurality of grooves for engagement with the corresponding spring detent of the circuit board base member for seating the plunger assembly in the electrode locators.

26. The EEG electrode locator headgear of claim 21, further comprising circuitry to reduce noise caused by high scalp-electrode impedance electrically connected to said electrode locator electrical conductor to receive EEG signals from said electrode.

27. The EEG electrode locator headgear of claim 26, further comprising an analog to digital converter mounted on the EEG electrode locator headgear, and wherein the EEG signals from the electrode locators are conducted from said circuitry to reduce noise to the analog to digital converter.

28. The EEG electrode locator headgear of claim 27, further comprising apparatus for analyzing the digital EEG signals from the user and an RF transmitter connected to receive output from the analog to digital converter, said RF transmitter being mounted on the EEG electrode locator headgear for communicating digital EEG signals to said apparatus for analyzing the digital EEG signals from the user.

29. The EEG electrode locator headgear of claim 28, wherein said apparatus for analyzing the digital EEG signals from the user comprises a data processing unit for analyzing EEG signals from the user, and for providing feedback to the user.

30. The EEG electrode locator headgear of claim 29, wherein said data processing unit is battery powered.

31. The EEG electrode locator headgear of claim 29, wherein said data processing unit includes a speaker for transmitting audio alert messages to the user.

32. The EEG electrode locator headgear of claim 28, wherein said RF transmitter of the EEG electrode locator headgear is a bi-directional RF transmitter-receiver for receiving feedback signals from said apparatus for analyzing the digital EEG signals from the user.

33. The EEG electrode locator headgear of claim 32, further comprising a speaker mounted in the EEG electrode locator headgear for communicating audio messages from the apparatus for analyzing the digital EEG signals to the user.

34. The EEG electrode locator headgear of claim 32, further comprising storage means mounted in the EEG electrode locator headgear for storing audio messages in analog format.

35. The EEG electrode locator headgear of claim 22, wherein said plunger assembly is adapted to form an electrical connection with said at least one electrical contact.

36. The EEG electrode locator headgear of claim 1, wherein each of said electrode locators comprises a plurality of spring loaded detent pins for engagement with said electrode.

37. An electroencephalograph (EEG) electrode locator headgear, comprising:

a base strap assembly adapted to be secured comfortably around the circumference of a user'"'"'s head;

an elastic, stretchable cap portion connected to said base strap assembly;

a visor connected to said base strap assembly; and

a plurality of EEG electrodes adapted to be received in said elastic, stretchable cap portion and cooperate with said elastic, stretchable cap portion.

38. The EEG electrode locator headgear of claim 37, further comprising a plurality of EEG electrode locators mounted to said elastic, stretchable cap portion for accurately positioning said plurality of EEG electrode locators relative to the user'"'"'s scalp, and for biasing said plurality of electrode locators toward the user'"'"'s scalp, each of said EEG electrodes including a plunger assembly adapted to seat the electrode in one of said EEG electrode locators, said plunger assembly including a plunger member having upper and lower ends, and said plunger assembly including an electrically conductive, flexible and resilient base member mounted to said lower end of said plunger member, said base member being adapted to contact the user'"'"'s scalp by exertion of downward pressure of said plunger assembly against the user'"'"'s scalp.

39. The EEG electrode locator headgear of claim 38, wherein said base member is tapered, and has an annular, lower end surface.

40. The EEG electrode locator headgear of claim 39, wherein said lower end surface of said base member is uneven.

41. The EEG electrode locator headgear of claim 38, wherein said base member is adapted to receive an electrically conductive gel to be pressed against the scalp.

42. The EEG electrode locator headgear of claim 38, wherein said base member is formed of electrically conductive silicone.

43. The EEG electrode locator headgear of claim 38, wherein said plurality of EEG electrode locators each comprise a plurality of slots for receiving at least one locator strap.

44. The EEG electrode locator headgear of claim 38, wherein each of said electrode locators comprises an electrode locator electrical conductor adapted to be electrically connected to one of said EEG electrodes inserted in said electrode locator.

45. The EEG electrode locator headgear of claim 44, wherein said electrode locator electrical conductor comprises at least one electrical contact.

46. The EEG electrode locator headgear of claim 45, wherein each of said electrode locators comprises a circuit board base member mounted to said electrode locator electrical conductor, and wherein said at least one electrical contact is connected to said circuit board base member.

47. The EEG electrode locator headgear of claim 46, wherein said plunger assembly is adapted to be received in said circuit board base member of the electrode locator.

48. The EEG electrode locator headgear of claim 41, wherein the circuit board base member includes a spring detent, and said plunger member has a plurality of grooves for engagement with the corresponding spring detent of the circuit board base member for seating the plunger assembly in the electrode locator.

49. The EEG electrode locator headgear of claim 46, wherein said EEG electrode locator headgear includes impedance monitoring circuitry for measuring scalp-electrode impedance values and generating impedance signals indicating said impedance values for each EEG electrode, respectively.

50. The EEG electrode locator headgear of claim 49, further comprising an analog to digital converter mounted on the EEG electrode locator headgear, wherein the impedance signals from the impedance monitoring circuitry are conducted from said impedance monitoring circuitry to said analog to digital converter.

51. The EEG electrode locator headgear of claim 45, wherein said plunger assembly is adapted to form an electrical connection with said at least one electrical contact.

52. The EEG electrode locator headgear of claim 44, further comprising circuitry to reduce noise caused by high scalp-electrode impedance electrically connected to said electrode locator electrical conductor to receive EEG signals from said electrode.

53. The EEG electrode locator headgear of claim 52, further comprising an analog to digital converter mounted on the EEG electrode locator headgear, and wherein the EEG signals from the electrode locators are conducted from said circuitry to reduce noise to the analog to digital converter mounted on the EEG electrode locator headgear.

54. The EEG electrode locator headgear of claim 53, further comprising apparatus for analyzing the digital EEG signals from the user, and an RF transmitter connected to receive output from the analog to digital converter, said RF transmitter being mounted on the EEG electrode locator headgear for communicating digital EEG signals to said apparatus for analyzing the digital EEG signals from the user.

55. The EEG electrode locator headgear of claim 54, wherein said apparatus for analyzing the digital EEG signals from the user comprises a data processing unit for analyzing EEG signals from the user, and for providing feedback to the user.

56. The EEG electrode locator headgear of claim 55, wherein said data processing unit is battery powered.

57. The EEG electrode locator headgear of claim 55, wherein said data processing unit includes a speaker for transmitting audio alert messages to the user.

58. The EEG electrode locator headgear of claim 54, wherein said RF transmitter of the EEG electrode locator headgear is a bi-directional RF transmitter-receiver for receiving feedback signals from said apparatus for analyzing the digital EEG signals from the user.

59. The EEG electrode locator headgear of claim 58, further comprising a speaker mounted in the EEG electrode locator headgear for communicating audio messages from the apparatus for analyzing the digital EEG signals to the user.

60. The EEG electrode locator headgear of claim 58, further comprising storage means mounted in the EEG electrode locator headgear for storing audio messages in analog format.

61. The EEG electrode locator headgear of claim 38, wherein each of said electrode locators comprises a plurality of spring loaded detent pins for engagement with said electrode.

62. The EEG electrode locator headgear of claim 38, wherein said plunger assembly base member is adapted to prepare the user'"'"'s scalp for contact with one of said EEG electrodes.

63. The EEG electrode locator headgear of claim 38, further comprising an outer cap shell disposed over said elastic, stretchable cap portion, and a Faraday shield attached to the outer cap shell to provide shielding against external noise and artifacts.

64. The EEG electrode locator headgear of claim 37, wherein said elastic, stretchable cap portion comprises at least one elastic locator strap.

65. The EEG electrode locator headgear of claim 64, wherein said at least one elastic locator strap comprises a plurality of elastic locator straps.

66. The EEG electrode locator headgear of claim 65, wherein said plurality of locator straps are made of elastic material.

67. The EEG electrode locator headgear of claim 65, wherein said plurality of locator straps are formed of elasticized fabric.

68. The EEG electrode locator headgear of claim 37, wherein said elastic, stretchable cap portion comprises a stretch mesh cap of elastic, fabric material.

69. The EEG electrode locator headgear of claim 37, further comprising an outer cap shell disposed over said elastic, stretchable cap portion.

70. The EEG electrode locator headgear of claim 69, further comprising a Faraday shield attached to the outer cap shell to provide shielding against external noise and artifacts.

71. The EEG electrode locator headgear of claim 37, wherein said base strap assembly comprises a front pad of material having first and second ends, said front pad of material being adapted to extend across a user'"'"'s forehead, said base strap assembly having a first end connected to said first end of said front pad of material, and a second end connected to said second end of said front pad of material, said front pad of material and said base strap assembly being adapted to be secured comfortably around the circumference of a user'"'"'s head.

72. The EEG electrode locator headgear of claim 71, wherein said visor is attached to said front pad of material.

73. The EEG electrode locator headgear of claim 71, wherein said base strap assembly comprises a pair of adjustable elastic straps connected at one end to said front pad of material and adjustably connected together at the other end.

74. The EEG electrode locator headgear of claim 71, wherein said base strap assembly further comprises an occipital locator device adapted to be seated on a region of the user'"'"'s scalp over the user'"'"'s occipital bone to confirm accurate placement of the EEG electrode headgear, said base strap assembly comprising first and second elastic edge straps connected at one end to said front pad of material, and adjustably connected at the other end to said occipital locator device.

75. The EEG electrode locator headgear of claim 37, wherein said base strap assembly is adjustable.

76. The EEG electrode locator headgear of claim 37, wherein said plurality of EEG electrodes comprises two EEG electrodes.

77. The EEG electrode locator headgear of claim 37, further comprising an outer cap shell disposed over said elastic, stretchable cap portion, and a Faraday shield attached to the outer cap shell to provide shielding against external noise and artifacts.

78. The EEG electrode locator headgear of claim 37, wherein EEG electrode locator headgear includes impedance monitoring circuitry for measuring scalp-electrode impedance values and generating impedance signals indicating said impedance values for each EEG electrode, respectively.

79. An electroencephalograph (EEG) electrode locator headgear, comprising:

a base strap assembly adapted to be secured comfortably around the circumference of a user'"'"'s head, said base strap assembly including an occipital locator device adapted to be seated on a region of the user'"'"'s scalp over the user'"'"'s occipital bone to confirm accurate placement of the EEG electrode headgear;

an elastic, stretchable cap portion connected to said base strap assembly; and

a plurality of EEG electrodes adapted to be received in predetermined locations in said elastic, stretchable cap portion and cooperate with said elastic, stretchable cap portion.

80. The EEG electrode locator headgear of claim 79, further comprising an outer cap shell disposed over said elastic, stretchable cap portion, and a Faraday shield attached to the outer cap shell to provide shielding against external noise and artifacts.

81. The EEG electrode locator headgear of claim 79, wherein EEG electrode locator headgear includes impedance monitoring circuitry for measuring scalp-electrode impedance values and generating impedance signals indicating said impedance values for each EEG electrode, respectively.

82. An improvement in a portable electroencephalograph (EEG) electrode locator headgear, the EEG electrode locator headgear including a base strap assembly adapted to be secured comfortably around the circumference of a user'"'"'s head, an elastic, stretchable cap portion connected to said base strap assembly, a visor connected to said base strap assembly, a plurality of EEG electrodes adapted to be received in predetermined locations in said elastic, stretchable cap portion and cooperate with said elastic, stretchable cap portion, and an outer cap shell disposed over said elastic, stretchable cap portion, the improvement comprising a Faraday shield attached to the outer cap shell to provide shielding against external noise and artifacts.

83. All improvement in a portable electroencephalograph (EEG) electrode locator headgear, the EEG electrode locator headgear including a base strap assembly adapted to be secured comfortably around the circumference of a user'"'"'s head, an elastic, stretchable cap portion connected to said base strap assembly, a visor connected to said base strap assembly, a plurality of EEG electrodes adapted to be received in predetermined locations in said elastic, stretchable cap portion and cooperate with said elastic, stretchable cap portion, the improvement comprising impedance monitoring circuitry associated with said plurality of EEG electrodes for measuring scalp-electrode impedance values and generating impedance signals indicating said impedance values for each EEG electrode, respectively.