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Biomechanical, biothermic and bioacoustic signal acquisition

The basis of the many activities of the body is the processing and transmission of electrical signals. The implementation of these signals in the organs and muscles leads to further biophysical phenomena which can also be detected non-invasively. In addition, it is also possible to monitor signals based on biochemical and biomechanical changes. These range from thermal effects and acoustic effects as a result of muscle contractions to mechanical changes.

• Phonocardiogram (PCG)
For the phonocardiogram, heart sounds are recorded which are perceptible on the body surface. The cause are the dynamic effects caused by the stimulation of the heart muscle through electrical signals, which are recorded with an acoustic sensor. They allow an evaluation of the condition of the heart muscle. In combination with the acquisition of the electrical basic parameters (ECG) additional diagnostic information can be obtained.

• Phonomyogram (PMG)
For the phonomygram, muscle sounds are recorded in the ultrasound area, which are perceptible on the body surface. The cause is the force generated by the nerves in response to the electrical stimulation of the muscle, which can be detected with an acoustic sensor. This allows an assessment of the condition of the muscles (tensions, blockages). Furthermore, an analysis of the ratio of the muscle fiber types can be carried out.

• Temperature / pressure measurement
The measurement of surface temperatures / pressures can provide an assessment of the physical condition, especially on extremities. Thus, for example, changes in walking due to mechanical limitations after accidents (fractures) or strokes can be well diagnosed. By combining the parameters, an early detection of possible tissue alteration through decreased blood circulation is also possible.
The interpretation of the individual components of the preprocessing of the biological measuring chain is also of decisive importance when measuring non-electrical signals. Placing and interpretation of the sensors decide on the quality of the later diagnosis. Thorsis Technologies has been involved in research projects for several years. Together with medical partners, the company works on telemetric solutions and the development of wearables in the human area.