| 摘要 |
<p>A fetal scalp electrode is provided having a spiral tip 5 mounted on the distal end of a dielectric hub 4 and a reference electrode 9 mounted on the proximal end thereof. Conventional apparatus including drive tube (3) and guide tube (2) are used to attach the spiral tip to the fetal scalp in a cork screw fashion. These components are removed leaving electrode wires (8) connected to spiral tip (5) and reference electrode (9) respectively extending from the fetus for connection to suitable monitoring equipment. The spiral tip (5) of the electrode is formed of stainless steel pype 905L which is essentially non-magnetic and non-magnetisable. This has been found to overcome a significant problem of prior art electrodes when used for detecting S-T wave intervals in particular where magnetic properties of the stainless steel typically used can lead to losses of critical portions of the signal. The electrode is particularly suitable for monitoring of the S-T interval in which it is used in a unipolar configuration, i.e. the reference electrode (9) is not used, but instead a remote electrode is attached to the maternal thigh. The wire connected to reference electrode (9) may, however, be simultaneously used for monitoring fetal heart rate.</p> |
