Abstract: A pacemaker has a sensor for deteching inertial and/or rotational movements of a patient in whom the pacemaker is implanted. The sensor has a hollow member with at least one freely moveable member therein, the freely moveable member generating a mechanical vibration upon movement thereof within the hollow member caused by movement or rotation of the patient. A transducer generates an electrical signal corresponding to the mechanical vibrations, the electrical signal being proportional to the movement. This electrical signal is used to vary the rate at which stimulation pulses are supplied to the patient by the pacemaker.

Abstract: In an exemplary embodiment, an electrical signal is to be generated corresponding to the pressure to be measured. The pressure transducer is formed by an outer tube in which a measuring cell as well as a liquid line connected to a liquid reservoir are disposed. In order to be able to calibrate the pressure transducer at the respective place of measurement, for example, a blood vessel, the disclosure provides that the open end of the outer tube is closed by a one-way valve through which fluid can only flow out in the direction from the tube. When a slight, specific underpressure is set, the one-way valve closes and the pressure transducer can be calibrated.