Method and apparatus for cardiac hemodynamic monitor

Details Method and apparatus for cardiac hemodynamic monitor Method and apparatus for cardiac hemodynamic monitor

1987-04-15

1990-05-22

Smith, Ruth S.

Surgery

Truss

Pad

128695, 128804, 343700MS, A61B 500

Patent

active

049268686

ABSTRACT:
A method and apparatus for cardiac hemodynamic monitoring is described. It is based on the complex field amplitudes of microwaves propagated through and scattered by thoracic cardiovascular structures, particularly the heart chambers, as a function of time during the cardiac cycle. Movement artifact and signal leakage are controlled by the use of closely coupled, flexible, light weight, passivated, conformal microstrip antennas that operate in the UHF band. The basic measurement technique is vector network analysis of the power wave scattering parameter in forward scatter configurations of various projections such as posterioanterior (PA), left anterior oblique (LAO), and right anterior oblique (RAO). Non-invasive evaluation of hemodynamic aspects of cardiovascular function is provided. Calibration is possible in human subject without invasive methods.

REFERENCES:
patent: 4360810 (1982-11-01), Landt
patent: 4572197 (1986-02-01), Moore et al.
patent: 4600018 (1986-07-01), James et al.
patent: 4638808 (1987-01-01), Mawhinney
Iskander et al., "An Electromagnetic Energy Coupler for Medical Applications", Proceedings of the IEEE, vol. 67, No. 10, Oct. 1979, pp. 1463-1465.
Bahl, "A Microstrip Antenna for Medical Applications", IEEE MTT-S International Microwave Symposium Digest, Washington, D.C., U.S.A., (May 28-30, 1980), pp. 358-360.
Pedersen et al., "Microwave Reflection and Transmission Measurements for Pulmonary Diagnosis and Monitoring", IEEE Transactions on Biomedical Eng., vol. BME-25, No. 1, Jan. 1978, pp. 40-48.

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