Measuring apparatus and a measuring method for the determination of parameters of medical fluids
First Claim
1. A measuring apparatus for the determination of a parameter of a medical fluid with a measured region which comprises the following:
- a measuring chamber device for receiving a disposable cassette with at least one measuring chamber through which the fluid to be measured is guided;
at least one measuring element for measuring a measured value whose value depends on an extent of the measuring chamber and allows for determination of the parameter, or of a value being in a fixed relationship thereto, with a known value for said extent of the measuring chamber, and at least one distance sensor unit which is arranged relative to the measuring chamber device such that a distance measured by said distance sensor unit changes relative to the extent of the measuring chamber.
1 Assignment
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Accused Products
Abstract
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.
78 Citations
19 Claims
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1. A measuring apparatus for the determination of a parameter of a medical fluid with a measured region which comprises the following:
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a measuring chamber device for receiving a disposable cassette with at least one measuring chamber through which the fluid to be measured is guided;
at least one measuring element for measuring a measured value whose value depends on an extent of the measuring chamber and allows for determination of the parameter, or of a value being in a fixed relationship thereto, with a known value for said extent of the measuring chamber, and at least one distance sensor unit which is arranged relative to the measuring chamber device such that a distance measured by said distance sensor unit changes relative to the extent of the measuring chamber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for the determination of a parameter of a medical fluid, comprising the steps of:
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leading the fluid through a measuring chamber;
measuring a measured value whose value depends on an extent of the measuring chamber in a measuring direction, said measured value allowing for determination of the parameter, or of a value being in a fixed relationship thereto, with a known value for said extent of the measuring chamber; and
said measurement of the measured value additionally determining a value that is in a fixed relationship with the extent of the measuring chamber in the measuring direction, or a change in said extent. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A method for the calibration of a measuring apparatus having a measuring chamber through which a medical fluid to be measured is guided, at least one measuring element for measuring a measured value whose value depends on an extent of the measuring chamber, and at least one distance sensor unit, comprising the steps of:
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a) sending a fluid with a known value of a parameter through the measuring chamber, with the measuring apparatus being suitable for determination of said parameter;
b) determining a measured value by the measuring element whose value depends on the extent of the measuring chamber in a measuring direction;
c) determining the extent of the measuring chamber in the measuring direction from the known parameter value and the measured value or from a value that is in a fixed relationship thereto;
d) measuring a signal of the distance sensor unit;
e) associating the measured signal with the determined value of the extent of the measuring chamber or with the value that is in a fixed relationship thereto;
f) changing the extent of the measuring chamber; and
g) repeating the steps b) to f) at least once for determination of a characteristic curve between the signal of the distance sensor unit and the extent of the measuring chamber, or the value that is in a fixed relationship thereto. - View Dependent Claims (18, 19)
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Specification