| 摘要 |
The electrode comprises an anchor point sandwiched firmly between a protective insulating sheath and an enlarged end portion of the selfsame sheath in such a way that the tip of the point projects from the distal end, together with a stimulation head disposed coaxially with the sheath and connected electrically to a spiral wound conductor; when the anchor point is corkscrewed into a cardiac muscle, a conductive spring positioned between the head and the conductor allows a measured retraction of the head back into the sheath, with the result that the head is maintained constantly in contact with the surface of the cardiac muscle independently of the penetrating movement of the point.
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