Electronic system for determining blood sedimentation rate using a continually retuned resonant circuit

US4187462A · kind A · utility

Assignee

• Labora Mannheim GmbH fur Labortechnik

Inventors

• Rolf Haker · Bischofswerda, DE
• Klaus Schrader · Zwickau, DE
• Joachim Thiery · Mannheim, DE

Key dates

• Filing date: Jan 20, 1978
• Grant date: Feb 5, 1980
• Expiry date: Jan 20, 1998

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N15/05
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A device for determining the blood sedimentation rate in a substantially vertical test tube, where the electrical or magnetic property of a given volume of liquid, which is changed by the settling of the erythrocytes in the test tube is measured as a function of time, by means of an oscillator with an output circuit which is completed via the column of liquid to be measured and by means of a measured-value pickup, having an output signal of which a pulse sequence of a definite frequency can be fed to a pulse counter with an indicating device. A coil-capacitor resonant circuit is coupled inductively with its coil or capacitively with its capacitor to liquid at a definite height in the test tube. An additional coil inductively coupled to the resonant-circuit coil serves as the measuring pickup. A retuning circuit is provided for the retuning of the resonance of the tuned L-C circuit which is detuned by the lowering of the boundary layer between the erythrocyte column and the plasma in the test tube. A pulse counter connected to the retuning circuit determines the number of retuning operations which correspond to the blood sedimentation rate. The electrical or magnetic property of the…