[Controlled vacuum extraction by measuring the pressure exercised by the truss (author's transl)]

The article explains a method for measuring the adhesivity between the anterior part of the foetus and the suction bulb of the vacuum extractor described by Malmström (1). The cover plate of the suction bulb, which is fitted with an expanding measuring strip, is used for reading off the measurements. This enables a quantitative recording of the pressure existing between the foetal part and the truss which corresponds very closely with the adhesivity of the suction bulb to the anterior part of the foetus. The device allows control and recording by means of an instrument with indicator and scale and a recording device. In this manner, vacuum extraction can be subjected to continuous control, thus rendering this obstetric procedure safer and easier.