. Medical electricity; a practical treatise on the applications of electricity to medicine and surgery. l vary withthe purpose to which it is applied, butusually they are from two to four inches inlength. The smaller the better, consistentwith the necessary strength. Ciniselli,Anderson, Dujardin-Beaumetz, and Robinstrongly insist on this point. The diam-eter may be stated as between one-twelfthand one-sixteenth of an inch—or smalleror larger than this, as may be most suita-ble under the special circumstances. If too small, theneedle may be destroyed by electrolytic action, or break asit is bei
. Medical electricity; a practical treatise on the applications of electricity to medicine and surgery. l vary withthe purpose to which it is applied, butusually they are from two to four inches inlength. The smaller the better, consistentwith the necessary strength. Ciniselli,Anderson, Dujardin-Beaumetz, and Robinstrongly insist on this point. The diam-eter may be stated as between one-twelfthand one-sixteenth of an inch—or smalleror larger than this, as may be most suita-ble under the special circumstances. If too small, theneedle may be destroyed by electrolytic action, or break asit is being introduced. To prevent oxidation, the uncoatedpart should be gilded. The insulation is extremely im-portant ; if defective, the current is deflected, the soundtextures are burned, and hence the electrolytic action isinefficient. Various kinds of coating are recommended tosecure proper insulation. Shellac, hard rubber, vulcanite,etc., are used. Hamilton1 advises the following, which hehas tested in actual use. As it seems to the author agood preparation, it is given for the benefit of those who. A box of needleelectrodes. 1 Clinical Electrotherapeutics. New York, D. Appleton & Co., 1875,p. 140. 254 ELECTRICITY IN SURGERY. may be unable to obtain the needles prepared by a com-petent dealer: Gum shellac (brown) one drachm. Squibbs solution of India-rubber, one and a half drachms. Wood naphtha, two drachms. Mix. With this solution, the needle is coated by successiveadditions of a thin layer, each one permitted to drythoroughly before the next one is put on. When suffi-cient coating has been laid on, it is rubbed down with thefinest emery paper, and a final layer or two are then addedto impart the necessary smoothness. The cutting end ofthe needle should be lancet-shaped, or triangular, to facili-tate transfixing of the skin, for a merely sharp needle willpass through the skin with difficulty. Each needle shouldhave a short flexible insulated wire attached for con-venience of m
Size: 1449px × 1724px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectro, bookyear1887
