Abstract: An at least partially implantable hearing system for rehabilitation of a hearing disorder, comprising at least one acoustic sensor for picking up an acoustic signal and converting it into an electrical audio sensor signal; an electronic signal processing unit for audio signal processing and amplification, the signal processing unit including an electronic driver arrangement; an electrical power supply unit which supplies individual components of the system with energy; and at least one electromechanical output transducer driven by the electronic driver arrangement and having a mechanical output impedance, said transducer being provided with an active electromechanical element and an output member for stimulating, via a passive coupling element, an ossicle of a middle ear ossicular chain, which chain has a natural capability for vibratory movement; wherein a switchable clutch arrangement is disposed between the active electromechanical element of the transducer and the passive coupling element, and wherein in

Abstract: An at least partially implantable hearing system for rehabilitation of a hearing disorder, comprising at least one acoustic sensor for picking up an acoustic signal and converting it into an electrical audio sensor signal; an electronic signal processing unit for audio signal processing and amplification, the signal processing unit including an electronic driver arrangement; an electrical power supply unit which supplies individual components of the system with energy; and at least one electromechanical output transducer driven by the electronic driver arrangement and having a mechanical output impedance, said transducer being provided with an active electromechanical element and an output member for stimulating, via a passive coupling element, an ossicle of a middle ear ossicular chain, which chain has a natural capability for vibratory movement; wherein a switchable clutch arrangement is disposed between the active electromechanical element of the transducer and the passive coupling element, and wherein in

Abstract: A vascular catheter for cannulating arterial or venous vessels, for example in the fermoral region, or the vena cava and/or the right auricle of the heart, comprises a flexible tube having blood passage orifices in the nature of holes at its anterior and insertion end to be inserted in the vessel or the auricle, which tube is directly or indirectly connectable at its other open end to a conduit or appliance. A piston-like closure member is movable to and fro in the tube in lengthwise direction thereof, such that it covers and thereby closes at least same of the blood passsage orifices in one position in the tube and clears these orifices in other positions. Preferably, the closure member is so fashioned that in its closure position, it covers all blood passage orifices in the insertion end of the cathether tube.