Biomedical solid gel electrodes prodn.

摘要

A process (A) for the prodn. of biomedical solid gel electrodes comprises; (Aa) feeding an adhesive-coated strip (I) with a siliconised paper cover which is cut through lengthwise at a distance of at least 5-25 mm from the edge, at regular intervals to a cutting device, with the adhesive side upwards; (Ab) cutting gaps in the strips corresp. to the above intervals and at least as big as the gel bodies to be formed; (Ac) covering the gaps underneath with adhesive film (II) so that the projecting parts of the film are firmly bonded to the strip; (Ad) making a hole in the middle of the strip, inserting the lug of an eyelet into the hole and pushing a stud up from below so that the film is clamped between eyelet and stud; (Ae) forming a cavity and filling it with a polymerisable mixt. (III); (Af) polymerising the mixt. to a gel by passing the strip with the mixt. through a UV irradiation section under normal conditions; (Ag) removing the siliconised paper and covering the sticky top of the strip and the gel with an anti-adhesive cover (IV); (Ah) punching out the finished electrode. In another process (B), stages (b-d) are as follows; other stages are as above; (Bb) cutting one or more circular gaps in the polymer strip to take the eyelet lug; (Bc) pulling off the paper cover at the place where the gel body is to be formed, and attaching the eyelet and stud as above; (Bd) heating the strip at this place to its distortion temp., positioning and fixing on a mobile deep-drawing mould, applying a vacuum and moving the mould back to original position. In a further version (C), stages (a), (f) and (g) are as above; other are as follows: (Cb) cutting circular holes in the strip to take an external connection for a sensor; (Cc) pulling of the paper where the gel is to be formed and placing the sensor over the gap; (Cd) placing a strip of non-woven textile on the adhesive coated surface; (Ce) saturating the fleece with mixt. (I) at the place where the gel is to be formed, then adding the same amt. of (I) again and distributing the mixt. to give a uniform liq. level with the required layer thickness; (Ch) cutting the electrode body out up to the antiadhesive cover, pulling off the remainder as a strip, cutting through the antiadhesive cover level with the attached electrodes and separating into sections depending on pack size. Also claimed are non-woven fabric electrodes, flat electrodes and mini-electrodes obtd. by process (A), transparent electrodes obtd. by process (B) and gel electrodes obtd. by process (C).