Zahn V, Seitz P
J Perinat Med. 1979;7(5):270-2.
In order to register contractional activity, especially in the case of high-risk pregnancies, a tocograph was develop by means of which the contractions are registered by a small cassette recorder, which the patient can carry by about with her. A separate graphic recorder is responsible for the playback and this recorder remains at the doctor's practice. The patient is able to register her contractions herself as the unit is so simple to use. The recording section weighs only 500 grams, including the specially developed pressure transducer with optical distance-meter. The tocograph is produced in series.
为了记录宫缩活动，尤其是在高危妊娠的情况下，人们研发了一种宫缩图仪。通过它，宫缩情况由一个小型盒式录音机记录下来，患者可以随身携带。一个单独的图形记录仪负责回放，且该记录仪留在医生诊所。由于该装置使用非常简单，患者能够自行记录宫缩情况。记录部分仅重500克，包括专门研发的带有光学测距仪的压力传感器。这种宫缩图仪是批量生产的。
