Fresenius Ag

Fresenius Medical Care Deutschland Gmbh

Klaus Metzner

Detlef Westphal

Hans-Dietrich Polaschegg

Franz-Wilhelm Koerdt

Wolfgang Allendorfer

Reinhard Hahnel

Alexander Heide

Dejan Nikolic

Bernd Steinbach

Peter Scheunert

Walter Pieper

Harald Peter

Paul Jahn

Andreas Wild

Matthias Kr&auml;mer

Franz Wilhelm Koerdt

Uwe Lapp

Gunther Grimm

Alexander Kuhn

The invention relates to a method for calibrating sensors, in particular RFID sensors, within an enclosure such as, e.g., a sterilization chamber. It furthermore relates to a sensor calibrated by the method of the invention, a disposable device including such a sensor, as well as a treatment device.

Method for calibrating a sensor within an enclosure; sensor, disposable, and treatment device including a like sensor

This invention relates to the field of signal transit time sensors, in particular sensors based on ultrasonic transit times. Existing electronic control circuits for such transit time sensors for measurements on medical liquids, in particular blood, are extremely complex or their time resolution is limited. However, the present invention makes use of a simple measurement technique which cannot be used directly at first for the time resolution to be achieved. In this method, an ordinary sampling method is used to detect the received signal (). An oscillator-like received signal () generated by an emitted step-like signal is first sampled during a half-period () and is checked with the help of a selection criterion. Only when the result of this check is positive is at least one interpolated or extrapolated contact point () of the received signal () with a resting level () determined in a received signal-time diagram with the help of which the signal transit time or the change in signal transit time is determined.

Acoustic method for measuring a signal propagation time in a medical liquid and device for using this method

A measuring apparatus for the determination of parameters of medical fluids with a measured region which including a measuring chamber device for receiving a disposable cassette with at least one measuring chamber through which the fluid to be measured is guided, and at least one measuring element for measuring a measured value whose value depends on the extent of the measuring chamber in a measuring direction and allows the determination of the parameter, or of a value being in a fixed relationship thereto, with a known extent of the measuring chamber. A distance sensor unit is provided which is arranged relative to the measuring chamber such that the measured distance changes relative to the extent of the measuring chamber. A method is also provided for the determination of parameters of medical fluids which can be carried out with the measuring apparatus, and for the calibration of the measuring apparatus.

Measuring apparatus and a measuring method for the determination of parameters of medical fluids

A device for measuring parameters of medical fluids having a measurement chamber through which the fluid to be measured passes. The chamber is sealed on one side by a flexible membrane, and it also has a measurement plate that has a peripheral seal on its outer edge and is in contact with the flexible membrane. At least one sensor for measuring a parameter of the medical fluid is mounted on the measurement plate, and the measurement plate has a continuous inlet leading to the flexible membrane so that a vacuum can be established between the measurement plate and the flexible membrane.

Multifunction sensor

Urine measurement apparatus and method for the determination of the

In a measuring device for determination of the activity or the concentration of ions in solution comprising a flow channel (24) having a reference electrode and at least one measuring electrode, said flow channel having a first end (22) and a second end (23); a first line (18) connecting said first end of said flow channel to at least one calibrating liquid container (1,2,3) through first valve means (5,6,7); a first pumping means (14A) interposed in said first line (18) between said first valve means (5,6,7) and said first end (22) of said flow channel (24); a discharge line (19) connected to said first line adjacent said first end (22) of said flow channel (24), said discharge line having second pumping means (14B); a sample feed line (25) connected to said second end (23) of said flow channel for providing a sample to said flow channel; first and second sensors (10,11) arranged in said first and second ends of said flow channel, respectively, for detecting the flowing fronts of liquids, said sensors being capable of discriminating between the presence and absence of liquids and control means coupled to said sensors, pumping means, and valve means for controlling said pumping means and valve means, the improvement comprising a connection line (21) branching off from said exit line (19) of said second pump (14B), said connection line exiting into said flow channel (24) in the vicinity of said first exit (23), said connecting line (21), being provided with a first valve (9) and in said exit line (19), between the juncture of said lines (18) and 19 at mixing point 27 and the point of connection of connection line (21) to said exit line (19), a second valve (8) being provided.

Measuring apparatus for determination of the activity or of the

There is described a method and apparatus for the determination of hematocrit levels in which both the conductivity of whole blood and the conductivity of blood plasma are determined together. While a conductivity cell (18) is being used for the determination of the conductivity of whole blood, the conductivity of plasma is calculated in a computer (30) with the aid of ion selective electrodes (14, 16) from the sodium or potassium concentrations.

Process for the determination of the hematocrit level of whole blood and

Measuring device for determination of the activity or of the concentration of ions in solutions, which has an electrode block having several electrodes and with a flow channel, the flow channel being in connection at its one end with a sample vessel and is connected at its other end to a line, in which a pump is interposed, with calibrating solution containers. Between the pump and the outlet of the electrode block branches off a discharge line, in which a further pump is interposed. Preferably, both pumps are combined into a peristaltic pump, the lines being laid in the segments of the pump. According to a second embodiment, the electrode block is again in connection with the calibrating solution containers. The delivery of the sample is performed however on the same side through a septum. Advantageously, the other side of the electrode block opens out into a pressure equalization vessel, into which a withdrawal line opens in which in turn the above mentioned peristaltic pump is interposed.

Measuring device for determination of the activity or of the

An apparatus (1) for the drawing off of untreated and treated dialyzing liquid and/or blood from a dialysis device (1) has a dialyzer, from which a first line (22) goes off upstream and a second line (24) goes off downstream, which join into a third line (54). The third line (54) is connected to an analysis device (57). In each of the first and second lines is provided a pump (26, 28) and a shut-off element (56, 56'), between which an overflow (38, 40) per line is arranged. This on the one hand ensures that the liquid in the lines (22, 24) are kept constantly in motion, which prevents the formation of line blockages in the case of liquids tending to coagulate, and on the other hand considerably reduces the displacement time of the liquid to be investigated to the analysis device (57).

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Friedrichsdorf, Germany

Klaus Metzner