Medical electrode with relatively rigid electrolyte cup

Claim 2

The electrode of claim 1 wherein said rim and said outer wall are circular, and wherein said adhesive completely surrounds said outer wall.

Claim 3

The electrode of claim 1 wherein said means defining said cup comprises a thin sheet of plastic formed in the shape of a cavity washer.

Claim 4

In a medical electrode of the type having an inverted, non-conducting and collapse resistant cup member for containing an electrolyte and a conductor located within said cup member remote from its mouth, the improvement wherein the mouth of said cup member is defined by a U-shaped flange having a convexly curved rim adapted to engage the skin of a subject, said flange having an outer wall with an upper margin spaced from said rim, and wherein said electrode further includes an elastic sheet overlying and projecting beyond said upper margin, an adhesive on lower surface portions of said elastic sheet beyond said upper margin for attaching said elastic sheet to the skin, said outer wall supporting said elastic sheet remote from the skin whereby portioNs of said elastic sheet immediately adjacent said outer wall are stretched when said elastic sheet is moved into engagement with the skin, the stretched portions of said elastic sheet biasing said rim into firm engagement with the skin.

Claim 5

The electrode of claim 5 wherein said adhesive is pressure sensitive and said elastic sheet is stretched as a result of said elastic sheet being pressed against the skin.

Claim 6

The electrode of claim 6 wherein said cup member is circular and said adhesive completely surrounds said cup member.

Claim 7

The electrode of claim 5 wherein said cup member is made from a thin sheet of plastic.

Claim 8

The electrode of claim 5 further including a clamp plate overlying said elastic sheet and said conductor penetrating said elastic sheet to fix said clamp plate to said cup member thereby to clamp said elastic sheet to said cup member.

Claim 9

The electrode of claim 9 wherein said conductor consists of interfitting parts pressed together and having upper and lower plates engaging said clamp plate and said cup member, respectively, holding them in mutually fixed relation with said elastic sheet clamped therebetween.

Claim 10

The electrode of claim 9 wherein said clamp plate is constructed identically to said cup member and wherein said clamp plate and said cup member are aligned on opposite sides of said elastic sheet.

Claim 11

The electrode of claim 9 wherein said cup member and said clamp plate are both circular and are relatively thin plastic members, said clamp plate having a margin confronting said upper margin of said cup member whereby a circular area of said elastic sheet is squeezed therebetween.

Claim 12

The electrode of claim 5 wherein said elastic sheet is made from an open cell thermoplastic having relatively closed cell upper and lower surfaces.

Claim 13

The electrode of claim 13 wherein said thermoplastic is polyvinylchloride.

Claim 14

In a medical electrode, a low profile non-conducting, relatively rigid, collapse resistant cup member having a base and a rim, apertured elastic sheet means connected to said cup member overlying said rim, an adhesive on the lower surface of said sheet means adjacent and in surrounding relation to said rim, a snap fastener projecting through said base and supported by said base remote from said rim, said snap fastener projecting through an aperture in said sheet means, and a removable protective cover for said adhesive.

Claim 15

The medical electrode of claim 15 wherein said rim has a convexly curved skin contacting surface.

Claim 16

The medical electrode of claim 15 wherein said snap fastener has interfitting parts holding said cup member and said sheet means in assembled relation.