Abstract: The invention relates to a protection for a semi-conductor switch against over voltages. A capacitive element is provided on an inlet connection of the semi-conductor switch. The load amount, which flows into said capacitive element, is integrated in order to trigger a protection function when a threshold value is exceeded.

Abstract: A sealing arrangement for a centrifugal pump is provided. The sealing arrangement permits a sealing gap between a rotating element such as a pump impeller and a non-rotating element such as a pump casing to be minimized, while protecting against element wear from gap reduction and element contact, particularly during transient operation such as pump start up. At least one of the rotating element and the non-rotating element is provided with a plurality of movably mounted bodies configured to rotate and maintain separate the rotating and non-rotating elements when the sealing gap is reduced. The elements and the bodies may be formed in an additive manufacturing process.

Abstract: A method for providing cleaning information for at least one surface of a medical imaging device. The method includes: recording contact data indicating contact between a person and at least one surface of the medical imaging device, wherein the contact data is recorded by at least one surface sensor unit; evaluating the contact data by an evaluation unit, wherein the evaluation of the contact data comprises identifying those surfaces of the medical imaging device which indicate a contact with and/or a physical proximity to a person; and generating cleaning information for the identified surfaces on the basis of the evaluated contact data and providing the cleaning information for the surfaces.

Abstract: Method for the operation of a cleaning system of a medical imaging facility, wherein the imaging facility has an outer useful surface exposed to contaminating effects of patients and/or operators. During a utilization phase for an examination procedure of a patient, sensor data of a sensor arrangement detecting at least a portion of the useful surface is acquired and by evaluation of the sensor data, a surface map having potentially contaminated regions of the useful surface is determined. During a cleaning phase following the utilization phase, cleaning information of the potentially contaminated regions are output to a cleaner and/or used for actuation of at least one cleaning apparatus of the imaging facility for targeted cleaning of the potentially contaminated regions.

Abstract: A sealing arrangement for a centrifugal pump is provided. The sealing arrangement permits a sealing gap between a rotating element such as a pump impeller and a non-rotating element such as a pump casing to be minimized, while protecting against element wear from gap reduction and element contact, particularly during transient operation such as pump start up. At least one of the rotating element and the non-rotating element is provided with a plurality of movably mounted bodies configured to rotate and maintain separate the rotating and non-rotating elements when the sealing gap is reduced. The elements and the bodies may be formed in an additive manufacturing process.