| 摘要 |
An RF voltage generated by an RF oscillator (13) is amplitude-modulated with the output voltage of an AF oscillator (14). The amplitude-modulated output voltage of the RF oscillator is applied to outer electrodes (2 and 3) via an impedance-matching transformer (15) and conductors (6, 7). Two parts of a broken bone (9) are held together mechanically by screws (11, 12) in the interior of a body part (8). One screw (11) is attached to a metal layer via an insulator and electrically connected to said metal layer via a diode. The metal layer forms an inner electrode (4). The other screw (12) penetrates a metal plate which forms a further internal electrode (5) and is connected in an electrically direct fashion to the metal plate. The RF oscillation serves to transmit the AF energy of the AF oscillator (14) to the said screws (11, 12) via a capacitor formed by the one external electrode (2) and the one internal electrode (4) as well as a further capacitor formed by the other external electrode (3) and the other internal electrode (5). The amplitude-modulated RF voltage is demodulated by the diode, so that at the screws the AF voltage required for stimulating the tissue region between the screws is applied to said screws. The stimulation energy can be introduced in this way into the desired tissue region, the implants other than the one internal electrode (4) not needing to be changed in shape. <IMAGE>
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