The distal tip of the implantable lead is held at a desired tissue location by either positive fixation or passive fixation. Positive fixation (sometimes called "active fixation") involves the use of some type of mechanism or means for actively securing and holding the body tissue in contact with the distal tip. The most common type of positive fixation is achieved using a screw-in helix tip located at the distal end of the lead. Positive fixation is achieved by literally screwing the helix tip into the tissue. In contrast, passive fixation involves temporarily holding the distal tip near the desired location, e.g., through the use of tines near the distal electrode that become entangled with trabeculae located inside the heart, until some sort of tissue ingrowth can occur into the lead tip in order to firmly hold it in its desired position. http://www.freepatentsonline.com/5228455.html

Электроды с активной фиксацией имеют на конце специальную спираль – «буравчик», которая ввинчивается в мышцу. https://www.tulagb13.ru/hospital/cardiac-surgery/index_inc3....