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An implantable socket is described for percutaneous electrical pathways in long-term intermittent monitoring, stimulation and energy transmission.<BR>The shell of the socket is made of an acryl pipe. In the shell, a conductive rubber of 2.5 mm is housed, which serves as an electrical mediator between a lead wire in the body and a needle inserted via the skin. To insulate the conductive rubber from body tissues, the socket is filled with silicone oil of high viscosity and covered with a-silicone rubber sheet. The final dimension of the socket is 15 mm∅ x 7 mm. The needle is made of a 27 G disposable hypodermic needle and insulated by silicone varnish except 2-3mm at the tip, which makes contact with the conductive rubber in the socket.<BR>The durability of the socket was tested in experiments in which the needle was stuck into the socket 4, 000 times consecutively, and contact resistance and leakage resistance were measured every 50 times. Contact resistance remained below 10 Ω, and leakage resistance above 100 MΩ. The socket was implanted in a dog's chest wall for 67-120 days. No tissue abnormalities were observed at gross examinations.<BR>Possible applications of the socket to clinical and research purposes are discussed together with the consideration of some limitations in the use of the socket.
一般社団法人日本生体医工学会の論文