Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1992-02-14
1993-06-29
Michl, Paul R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524 47, 525 5431, 523105, 427118, 128640, C08L 312, A61B 504
Patent
active
052235696
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATION
This application is a national phase of PCT/EP90/01064 filed 3 Jul. 1990.
FIELD OF THE INVENTION
My present invention relates to a self-adhesive conductive elastic gel which is used especially for the production of body electrodes.
BACKGROUND OF THE INVENTION
From German open application 36 09 137 films of electrically conductive polymers are known which can be used as electrode materials. These films contain 0.1 to 50 weight-% of water soluble, substantially acid-group-free polymers, which can be present in the form of cellulose ethers and cellulose. These films are produced by an electrochemical polymerization of the monomers on flat etectrodes in aqueous electrolyte solvents. Thereafter, the films are removed from the electrodes upon which they were deposited.
In German open application 27 40 270, an electrode for medicinal purposes is described, especially for the taking of electrocardiograms, which has as a skin-contacting conductive self-adhesive gel, a hydrophilic polysaccharide like karaya-gum.
The known gels are relatively costly and must be introduced into or applied to the body electrode in a hot state in a technically complex manner. The adhesive capacity thereof against the skin, especially after multiple applications, leaves much to be desired.
OBJECT OF THE INVENTION
The object of the invention is to provide a gel for body electrodes, which avoids the disadvantages of the known gels, which can be simply and economically produced, which has a better adhesive force even after multiple uses than the known gels, and which does not require introduction into a body electrode in a hot state or application in an optional layer to the body electrode.
DESCRIPTION OF THE INVENTION
These objects are achieved with a self-adhesive conductive elastic gel based upon a water-soluble polymer and water-soluble monomers which is obtained by the polymerization of acrylic acid group containing monomers or acrylic acid group containing monomer mixtures with formation of skin-tolerable polymers or copolymers in an electrolyte-containing solution of a skin-tolerable starch material.
The gel can make use of amylopectin and starch material. It can use acrylic acid or methacrylic acid or esters thereof or their precursors. The solution of the starch material can contain a moisture-retaining agent, a pH-increasing substance, and/or a free radical supplying initiator or a photoinitiator for the polymerization of the monomers.
The skin-tolerable salt can be present as an electrolyte. The aqueous solution can contain 10 to 50 weight % of the starch material, 10 to 50 weight % of the monomer or monomers, 3 to 10 weight % of an electrolyte and 1 to 2 weight % of a free radical supplying initiator and the balance to 100% of water.
The invention also relates to the use of the gel of the invention as a self-adhesive conductive elastic material for body electrodes.
The invention is based upon the surprising discovery that when an acrylic acid group containing monomer or an acrylic acid group containing monomer mixture is polymerized to a skin-tolerable polymer or copolymer in a solution of a starch material, a gel is formed that has better adhesive characteristics against the skin even with multiple uses than the hitherto known gels.
Furthermore, it is possible according to the invention to introduce the solution of the starch material prior to the polymerization of a monomer or monomers into a body electrode or to apply them to a body electrode in a cold state and then carry out the polymerization for formation of the gel.
The aqueous solution of a starch material which is used to produce the gel of the invention is an aqueous solution and the monomers introduced for polymerization are also water soluble.
The starch materials which are used are preferably amylopectins with molecular weights between 300,000 and 2,000,000. The starch materials can also be substituted in various ways.
As monomers which are polymerized in the solution of the starch material, acrylic acid group con
REFERENCES:
patent: 4352359 (1982-10-01), Larimore et al.
patent: 4560724 (1985-12-01), Brabetz et al.
patent: 5004767 (1991-04-01), Krause et al.
patent: 5124076 (1992-06-01), Smuckler
DeWitt LaVonda
Dubno Herbert
Michl Paul R.
Zimmer Elektromedizin GmbH
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