MEASUREMENT SIGNAL TRANSMITTER FOR CONTINUOUS WATCHING OF THE MOTHER AND THE CHILD BEFORE AND DURING CHILD BIRTH

摘要

With a view to continuous watching of the mother and the child before and during child birth, a capsule (10) is placed on the lower part of the abdomen of the mother. This capsule contains a measurement signal generator (20, 22, 32, 42, 54, 56) which provides more than two data concerning the status of the mother and the child, for example, the ECG, the work of the child birth, the temperature of the skin, the hart beats of the foetus. These data are converted into pulses at determined repetition frequency by clock pulses by means of a multiplexer (64) and a modulator in the width of the pulses (68). This pulses are transmitted to a receiver (57) by a transmitter (16) placed into the capsule (10), transformed into analog signals and transcribed by a potentiometric register (58). The width of the pulses is limited by a time limitation circuit (78-84), at a value which is smaller than the time spacing of the clock pulses. The potentiometric register (58) comprises a capacitive-mechanical divider (110) acting as a detector for the balancing of the deviation of the register. This divider is connected so that the progress in temperature and the linearity of the components entered later should not be critical.