Abstract: A method for determining a position of a catheter tip of a catheter, more particularly of a central venous catheter, in the body of a patient, a medical system equipped to carry out such a method, and the use of the method in catheterization.

Abstract: A method for checking a position and/or an orientation of a catheter tip of a catheter, in particular a central venous catheter, in a patient's body, a medical system set up for carrying out such a method, and a use of such a method during a catheterization.

Abstract: An infusion system and method for providing different medical fluids to a patient. The infusion system, which can be used in complex infusion therapies, includes a catheter with a catheter tube and at least one lumen extending longitudinally through the catheter tube between a proximal tube end and a distal tube end. A plurality of pump devices are each connected to the at least one lumen so as to convey fluid. A control device is connected to the pump devices and adapted to control the pump devices so that the different medical fluids can be delivered through the at least one lumen by the pump devices in time division multiplex. The catheter can include the pump devices. Each pump device can be configured as a micropump mounted at the proximal tube end.

Abstract: A medical elastomer pump and an elastomeric membrane for use in infusion therapy. The elastomeric membrane forms a pump volume for receiving and delivering a medical fluid. In a filled state of the pump volume, in which the pump volume is filled at least in part with the medical fluid, the elastomeric membrane is resiliently stretched. The resiliently stretched elastomeric membrane applies a delivery pressure onto the pump volume for delivering the medical fluid. The elastomeric membrane has a plurality of bulge portions which, at least in the filled state, are convex, each forming a bulge. The bulges each form a pump volume portion of the pump volume.

Abstract: A medical fluid-line arrangement and a medical elastomeric pump having such a fluid-line arrangement. The fluid-line arrangement transfers a medical fluid between a medical elastomeric pump and a patient port. The fluid-line arrangement has a fluid-line channel with an inlet and an outlet. The inlet connects to an outlet of the elastomeric pump, and the outlet connects to the patient port. A throttle element is connected in a fluid-conducting manner to the inlet and outlet of the fluid-line channel. A portion of the fluid-line channel extends through the throttle element. The throttle element causes a narrowing of an active-flow cross section of the fluid-line channel. The throttle element is encapsulated at least partially in a thermally conductive body having a heat-absorption surface that is larger than an outer surface of the throttle element and that is intended to be applied flat to a skin surface of a patient.

Abstract: An infusion arrangement for administering a medical fluid includes a medical elastomer pump that produces a delivery pressure dependent on expansion and thus is variable over an infusion duration, a fluid conduit path provided for discharging the medical fluid from the elastomer pump, and a fluid control device arranged in the fluid conduit path and designed to influence a volumetric flow of the medical fluid delivered through the fluid conduit path by the elastomer pump. The fluid control device has a hydraulic flow-regulating valve designed to regulate the volumetric flow to a setpoint value and is provided with a throttle action that is automatically variable at least in accordance with the delivery pressure. The infusion arrangement can be used in infusion therapy.

Abstract: An infusion arrangement for administering a medical fluid includes a pump apparatus with an elastomeric membrane which forms a pump volume. The elastomeric membrane is elastically extended in a fill state, filled at least partially with medical fluid, of the pump volume and produces a delivery pressure on the pump volume. An infusion line is connected to the pump volume and provided with a patient access for fluid-conducting connection. A main fluid channel transfers medical fluid from the pump volume to the patient access. A monitoring device is connected to the infusion line and configured for monitoring the pump apparatus. The monitoring device has a differential pressure-measuring element connected to the main fluid channel and designed such that differential pressure formed along a channel portion of the main fluid channel can be detected by the differential pressure-measuring element and a delivery rate of the medical fluid can be indicated.

Abstract: An infusion arrangement for administering a medical fluid includes a pump apparatus with an elastomeric membrane which forms a pump volume. The elastomeric membrane is elastically extended in a fill state, filled at least partially with medical fluid, of the pump volume and produces a delivery pressure on the pump volume. An infusion line is connected to the pump volume and provided with a patient access for fluid-conducting connection. A main fluid channel transfers medical fluid from the pump volume to the patient access. A monitoring device is connected to the infusion line and configured for monitoring the pump apparatus. The monitoring device has a differential pressure-measuring element connected to the main fluid channel and designed such that differential pressure formed along a channel portion of the main fluid channel can be detected by the differential pressure-measuring element and a delivery rate of the medical fluid can be indicated.

Abstract: There is provided a wireless headphone unit having at least one electroacoustic transducer and a transmitting/receiving unit for wirelessly receiving first signals which contain audio signals to be reproduced on the electroacoustic transducer and a network identification unit for storing the network identification of the wireless headphone unit, wherein the transmitting/receiving unit is adapted for wirelessly transmitting the network identification of the headphone unit.

Abstract: Provided is an electroacoustic transducer having a diaphragm (10). The diaphragm (10) has a first and a second region (20, 30), wherein the hardness, stiffness or compliance of the first region (20) differs from the second region (30).

Abstract: Provided is an electroacoustic transducer having a diaphragm (10). The diaphragm (10) has a first and a second region (20, 30), wherein the hardness, stiffness or compliance of the first region (20) differs from the second region (30).

Abstract: A method of denoise a stereo signal comprising a stereo sum signal and a stereo difference signal, performs a frequency selective stereo to mono blending based on the masking effect of the human auditory system. Therefore, a stereo signal noise reducer, comprising a first filter bank (1) to split the stereo difference signal (l?r) into a plurality of subbands, respective first multipliers (CO, . . . , CN) to weight each of the subbands of the stereo difference signal with a respective corresponding control signal (CO, . . . , CN), and a first adder (3) to sum all weighted subbands of the stereo difference signal (l?r) to build a frequency selective weighted stereo difference signal (diff), within which a number and width of the subbands obtained via the first filter bank (1) are choosen according to the properties of the human auditory system, further comprises a weighting factor determination unit which determines a respective control signal (CO, . . .

Abstract: A signal receiver and a method for separating a RDS signal component from a received signal is described. After the received signal has been downconverted to the baseband, the baseband signal is split up into a first baseband signal for a first signal path and a second baseband signal for a second signal path. The first baseband signal is highpass filtered and forwarded to a frequency synchronization unit that generates a frequency synchronization carrier. The second baseband signal is modified in accordance with the frequency synchronization carrier provided by the first signal path, and a synchronized baseband signal is obtained that still comprises the full range of the RDS signal's spectral components.

Abstract: A method for preprocessing a signal, wherein an iterative process with at least one iteration is performed to generate an output signal based on an input signal. In each iteration a preceding intermediate output signal and the input signal is received. A process is applied to the preceding intermediate output signal to transform the latter according to a given transfer function so as to generate a transformed preceding intermediate output signal. Then, the input signal is subtracted from the transformed intermediate output signal. Thereby, an intermediate error signal is generated and then added to the intermediate output signal so as to generate a succeeding intermediate output signal which is used as an output signal after the iterative process stopped.

Abstract: A reduced peak simulcast signal generator and a method for generating a stable peak-attenuated simulcast signal, which combines a digital broadcast signal and an analogue broadcast signal, are described. The simulcast signal generator comprises at least one attenuation stage for attenuating the digital and/or the analogue broadcast signal in order to obtain a stable simulcast signal. Each attenuation stage comprises a simulcast signal generator for generating an error signal, and attenuation means which attenuate, in dependence of said first error signal, at least one of the analogue and the digital broadcast signal.

Abstract: A radio transmission signal consisting of signal frames that comprise a dynamic data part and a quasi-static data part according to the present invention is characterized in that the dynamic data part of a respective frame contains an indicator showing in which following frame the quasi-static data part of this respective frame will be repeated. Therewith, an alternative frequency of e.g. a digital shortwave signal like a DRM signal can easily and satisfactorily be checked before a fast seamless switching to this alternative frequency can be performed.

Abstract: In an automatic gain control unit, the gain of a voltage-controlled amplifier (VCA) (25) is regulated with a closed-loop control circuit. The time constant of the control circuit is varied dependent on the magnitude (31) of the VCA output signal. As long as the magnitude (31) of the VCA output signal is small, the gain is slowly adjusted. In case the magnitude (31) of the VCA becomes so large that saturation of the analog-digital converter (28) might occur, the time constant of the control circuit is decreased, in order to allow for a quick adjustment of the amplifier's gain.

Abstract: There is provided a wireless headphone unit having at least one electroacoustic transducer and a transmitting/receiving unit for wirelessly receiving first signals which contain audio signals to be reproduced on the electroacoustic transducer and a network identification unit for storing the network identification of the wireless headphone unit, wherein the transmitting/receiving unit is adapted for wirelessly transmitting the network identification of the headphone unit.

Abstract: Many broadcast stations transmit their programs via a variety of different frequencies. The invention relates to monitoring alternative frequencies during the reception of a broadcast signal at a present frequency. Whenever the broadcast signal at an alternative frequency is checked, the receiver's gain is instantaneously switched from a present gain value corresponding to the present frequency to a second gain value corresponding to the alternative frequency. The second gain value is adapted to the supposed signal strength of the broadcast signal at the alternative frequency.

Abstract: A compander for noise reduction of a FM signal is described, wherein a group delay (?) linked to the generation of the compressor gain (cc(t)) is equalised during generation of the multiplex signal (m(t)), and a group delay (?) linked to the generation of the expander gain (ce(t)) is equalised during generation of the sum signal (us(t)) and the expanded difference signal (ue(t)). Alternatively or additionally the compressor gain and/or the expander gain is controlled by an auxiliary signal on the basis of a combination of sum signal and difference signal of the FM signal. Such companders avoid overmodulation in the transmitter.