Importance

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Abstract

A fetal electrode applicator for attaching a coil electrode to the skin of a fetus by moving the coil electrode forwardly through the forward end of an inserter tube introduced through the mother's vagina by a plunger having cooperating helical threads for converting linear force applied to the plunger to rotary motion of the coil electrode. In one embodiment, the helical threads include cooperating helical ribs and grooves on the electrode carrier and the forward interior wall of the inserter tube, and a plunger rod pushes the electrode carrier forwardly. In the preferred embodiment, helical grooves are formed on a motion converter which carries the electrode carrier, and radially-inwardly projecting pins on the forward interior wall of a plunger tube engage the helical grooves; and stops are provided for limiting forward movement of the motion converter, whereby depression of the plunger after the coil electrode has moved forwardly a predetermined distance will result in only rotary motion of the coil electrode.

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First Claim