Patent US4033334A successfully refreshed from Google Patents.
US4033334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Snap-in compressible biomedical electrode
Assignee: National Aeronautics and Space Administration
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Filing: 1975-12-03
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Granted: 1977-07-05
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Expires: 1995-12-03
Abstract
Abstract A replaceable, prefilled electrode enclosed in a plastic seal and suitably adapted for attachment to a reusable, washable cap having snaps thereon is disclosed. The apparatus is particularly adapted for quick positioning of electrodes to obtain an EEG. The individual electrodes are formed of a sponge body which is filled with a conductive electrolyte gel during manufacture. The sponge body is adjacent to a base formed of a conductive plastic material. The base has at its center a male gripper snap. The cap locates the female snap to enable the electrode to be positioned. The electrode can be stored and used quickly by attaching to the female gripper snap. The snap is correctly positioned and located by mounting it in a stretchable cap. The cap is reusable with new electrodes for each use. The electrolyte gel serves as the contact electrode to achieve a good ohmic contact with the scalp.
Inventors
- 👤 with respect to an invention of Fletcher James C. Administrator of the National Aeronautics and Space Administration
- 👤 James D. Frost, Jr.
- 👤 Carl E. Hillman, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:12
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/24; A61B5/25; A61B5/271; A61B5/273; A61B5/274; A61B5/263; A61B5/266
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
163 words
A biomedical electrode assembly for use in obtaining EEG signals from a subject comprising: a resilient sponge-like body; an electrically conductive plastic base member attached to said sponge-like body, said base member having a generally planar surface; an electrolyte gel filling said sponge-like body; electrically conductive snap connector means embedded into said base member and extending outward therefrom; plastic coating means surrounding completely said sponge-like body and said plastic base member except for an area immediately surrounding said snap connector means extending outward therefrom, said coating means providing a leakproof barrier for said electrolyte gel; cap means formed of stretchable material for positioning in a predetermined pattern a plurality of said sponge-like bodies at desired locations about the head of a subject for obtaining EEG signals; and electrically conductive snap connector means attached to said cap means for releasably connecting both electrically and mechanically to one or more of said sponge-like bodies through corresponding snap connector means embedded into said base members thereof.
Claim 2
Dependent Claim
163 words
A biomedical electrode assembly for use in obtaining EEG signals from a subject comprising: a resilient sponge-like body; an electrically conductive plastic base member attached to said sponge-like body, said base member having a generally planar surface; an electrolyte gel filling said sponge-like body; electrically conductive snap connector means embedded into said base member and extending outward therefrom; plastic coating means surrounding completely said sponge-like body and said plastic base member except for an area immediately surrounding said snap connector means extending outward therefrom, said coating means providing a leakproof barrier for said electrolyte gel; cap means formed of stretchable material for positioning in a predetermined pattern a plurality of said sponge-like bodies at desired locations about the head of a subject for obtaining EEG signals; and electrically conductive snap connector means attached to said cap means for releasably connecting both electrically and mechanically to one or more of said sponge-like bodies through corresponding snap connector means embedded into said base members thereof.
Claim 3
Dependent Claim
35 words
The apparatus of claim 1 wherein said electrically conductive plastic base member comprises a plastic material and an electrically conductive material in a ratio which will permit molding and transmittance of the desired EEG signal.
Claim 4
Dependent Claim
12 words
The apparatus of claim 2 wherein said electrically conductive material is carbon.
Claim 5
Dependent Claim
22 words
The apparatus of claim 3 wherein the ratio of said materials is about 30 percent carbon to about 70 percent plastic material.
Claim 6
Dependent Claim
38 words
The apparatus of claim 1 wherein said sponge-like body is conically shaped, and further includes filling and sealing tab means at the apex thereof for easy cutting to enable said electrolyte gel to flow from said sponge-like body.
Claim 7
Dependent Claim
33 words
The apparatus of claim 1 wherein said cap means further includes electrical conductor means attached to said snap connector means of said cap means for transferring the EEG signal to suitable recording equipment.
References Cited (Backward Citations)
US3279468A
Cited
US3490439A
Cited
DE1489708A1
Cited
US3508541A
Cited
US3659614A
Cited
US3669110A
Cited
US3830229A
Cited
US3976055A
Cited
US3998213A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-04 | 1981-01-03 | 1981-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-04 | 1985-01-03 | 1985-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-04 | 1989-01-03 | 1989-07-05 | $7700.00 | Window Closed / Lapsed |