Medical conductive pressure sensitive adhesive

Frequent replacement of disposable electrodes is required in electrocardiograms, electroencephalograms, defibrillation instruments, my electrometer, transcutaneous electrical nerve stimulation therapy, neuromuscular electrical stimulation therapy, and other medical examinations and electrotherapy.

The electrical conductivity of this electrode and its adhesion properties are directly related to the examination results. In addition, since the electrode is in direct contact with the skin, the material of the electrode is required to be non-irritating, non-cytotoxic, and non-sensitizing to the skin.

At present, the disposable medical electrode is mainly composed of substrate carrier film, Ag/AgCl conductive paste printing layer, conductive pressure sensitive adhesive, and release film. Among them, the conductive pressure-sensitive adhesive is also referred to as conductive adhesive, which is mainly composed of acrylic conductive pressure-sensitive adhesive containing hydrophilic groups loaded with certain water and conductive electrolyte.

The existing acrylic conductive pressure-sensitive adhesive uses non-water-soluble acrylic ester, volatile, and easily causes toxic side effects; In order to reduce volatilization and residue, it is usually necessary to increase the recovery device and prolong the curing time, which increases the production cost and affects the production efficiency.

Chinese patent CN107163866A disclosed a medical UV curable water-based conductive pressure-sensitive adhesive, the conductive pressure-sensitive adhesive using hydroxypropyl acrylate, hydroxypropyl methacrylate, and other monomers to prepare medical conductive pressure-sensitive adhesive, although this monomer is water-soluble, its volatility is still large, processing and production inconvenience.

Moreover, such monomers have no ionic base and have no beneficial contribution to the conductivity of the conductive pressure-sensitive adhesive made, which requires electrolytes or monomers with ionic groups to provide. In addition, the Chinese patent CN107903838A discloses a kind of UV-curable conductive adhesive and its preparation method. The conductive adhesive uses 2-acrylamide – 2-methyl propyl sulfonic acid as the polymerization body to solve the volatilization and residual harm of non-water-soluble acrylate, and the monomer is anionic, which is beneficial to the conductive property of the prepared conductive adhesive. However, the conductive adhesive obtained from the process formula has weak adhesion and is easy to fall off when it is glued to the skin.