US3998215A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bio-medical electrode conductive gel pads
Assignee: 3M Co
•
Filing: 1971-04-23
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Granted: 1976-12-21
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Expires: 1991-04-23
Abstract
Abstract A gel pad has impregnated in a porous matrix or held within a cavity, an electrically conductive hydrogel capable of transferring electrical signals between the human body and an electrode of an electrical sensing device when the hydrogel is in contact with the body surface. The hydrogel is lightly adherent to the body surface but sufficiently cohesive so that no residue remains when the pad is removed therefrom.
Inventors
- 👤 Clifford J. Anderson
- 👤 James T. Gumbusky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:00
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/24; A61B5/25; A61B5/263; A61B5/266; A61B5/251; A61B5/257
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
75 words
An electrically conductive pad conformable to the surface of the human body and adapted to facilitate the transfer of electrical signals between the body and an electrode, comprising a porous, fibrous carrier having a lightly adherent, conductive hydrogel carried thereby, said hydrogel impregnating and surfacing both sides of said carrier and said hydrogel being more cohesive to said hydrogel than adhesive to the surface of the human body to enable residue-free removal from the skin.
Claim 2
Dependent Claim
75 words
An electrically conductive pad conformable to the surface of the human body and adapted to facilitate the transfer of electrical signals between the body and an electrode, comprising a porous, fibrous carrier having a lightly adherent, conductive hydrogel carried thereby, said hydrogel impregnating and surfacing both sides of said carrier and said hydrogel being more cohesive to said hydrogel than adhesive to the surface of the human body to enable residue-free removal from the skin.
Claim 3
Dependent Claim
19 words
The pad of claim 1 wherein said porous, fibrous carrier is a fabric carrier having a substantially porous matrix.
Claim 4
Dependent Claim
14 words
The pad of claim 2 wherein said fabric carrier is an absorbent, non-woven fabric.
Claim 5
Dependent Claim
35 words
The pad of claim 1 wherein said hydrogel comprises a mixture of water, polyvinyl alcohol, sodium borate decahydrate and a fungicide, said water being present in a concentration of at least about 70% by weight.
Claim 6
Dependent Claim
41 words
The pad of claim 1 wherein said carrier has a porosity of from about 300 cc. of air in 0.1 to 50 seconds as measured on a Gurley Densometer and a volume resistivity of from about 5 ohm-cm to 50,000 ohm-cm.
Claim 7
Dependent Claim
35 words
The pad of claim 5 wherein said hydrogel comprises a mixture of water, polyvinyl alcohol, sodium borate decahydrate and a fungicide, said water being present in a concentration of at least about 70% by weight.
Claim 8
Dependent Claim
11 words
The pad of claim 5 wherein said fibers are rayon fibers.
Claim 9
Dependent Claim
89 words
An electrically conductive pad conformable to the surface of the human body and adapted to facilitate the transfer of electrical signals between said body and an electrode, comprising a thin layer of a reinforced, lightly adherent, conductive hydrogel reinforced with from about 0.5 to 10% by weight of a fibrous material, said hydrogel being available for contact with the skin on at least two sides, said hydrogel being more cohesive to said hydrogel than adhesive to the surface of the human body to enable residue-free removal from the skin.
Claim 10
Dependent Claim
89 words
An electrically conductive pad conformable to the surface of the human body and adapted to facilitate the transfer of electrical signals between said body and an electrode, comprising a thin layer of a reinforced, lightly adherent, conductive hydrogel reinforced with from about 0.5 to 10% by weight of a fibrous material, said hydrogel being available for contact with the skin on at least two sides, said hydrogel being more cohesive to said hydrogel than adhesive to the surface of the human body to enable residue-free removal from the skin.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-12-21 | 1980-06-21 | 1980-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-21 | 1984-06-21 | 1984-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-21 | 1988-06-21 | 1988-12-21 | $7700.00 | Window Closed / Lapsed |