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Microprocessor-based air plethysmograph for the examination of compressed tissue of limbs

Fąs Tomasz, Kaczmarek Mariusz

Acta of Bioengineering and Biomechanics

2022

Vol. 24, no. 3

41--48

The aim of the article is to propose a simple microprocessor-based air plethysmograph that uses a measurement of changes in air pressure in a closed cuff to determine the changes in the volume of the compressed limb. Methods: The microprocessor-controlled measurement system applied pressure to the object (ultimately the limb) by pumping air into the cuff surrounding the object. Changes in pressure and air temperature in the cuff over time were recorded. The results supplemented with the calibration procedure made it possible to determine the changes in the volume of the object. Results: Measurement-independent calibration and temperature correction of pressure changes in the system proved to be necessary components of the measurement procedure for volume changes. When comparing the device test results with the actual changes observed with the limb model, there was a discrepancy between 0.2 and 0.7 percent of the total volume under the cuff. Conclusions: Studies have shown that the proposed air plethysmograph is useful for assessing the changes in the volume of the limb model within the range that are expected in the diagnosis of lymphedema. The solution is a cheaper and less complicated alternative than most of the available methods of measuring changes in the volume of edema tissue under controlled pressure.

Diagnosis support method of pletysmographical records with the use of framework tenets

Penhaker M.

Journal of Medical Informatics & Technologies

2003

Vol. 5

MI121--127

The aim of this study is the processing and evaluating of plethysmographical records giving important information about the blood vessel function. Result of this study is to present the methodology for classifying the records by means of mathematical methods that would contribute to systematic evaluation of what has been found by finger plethysmography. Thereafter the experimental expert system based on framework systems serves to determine the diagnosis on the basis of previous mathematical processing is introduced. The goal of the project was also creation of application by the form of the extension of kernel for the use of framework that is determined for support of control and information systems development in the area of signal processing, elaborate and describe the methodology of extension hereof setting in the nature of specific applications. Beyond above-mentioned outputs the solution of the project should give the specific knowledge about the usage effectiveness of evolutional frameworks. Fundamental implementation idea is based on the usage of MATLAB as the basis for extension of common kernel.