Surgery – Truss – Pad
Patent
1985-01-07
1986-05-27
Howell, Kyle L.
Surgery
Truss
Pad
128691, A61B 502
Patent
active
045909482
ABSTRACT:
In a method and an apparatus for measuring the superficial blood flow in tissue, a section of the tissue is irradiated with monochromatic light from a laser source. Light scattered by moving blood cells and adjacent stationary structure within a part of the irradiated section is collected and passed to a photo-detector arrangement, which produces an output signal containing fluctuating signal components, a Doppler signal, deriving from interference between light components having differing frequencies due to having been scattered by moving blood cells and thereby subject to frequency shifts. The Doppler signal contains information concerning the number of blood cells present and the velocity at which they move. By means of a signal processor, there is derived from the Doppler signal a signal which is linearly related to the blood flow expressed as the product of the number of blood cells and their average velocity of movement, and a signal which is linearly related to the number of blood cells present.
REFERENCES:
patent: 4109647 (1978-08-01), Stern et al.
patent: 4476875 (1984-10-01), Nilsson et al.
Dennis Watkins & G. Allen Holloway, Jr., "An Instrument to Measure Cutaneous Blood Flow Using the Doppler Shift of Laser Light", IEEE Transactions on Biomedical Engineering, vol. BME-25, No. 1, Jan. 1978, pp. 28-33.
M. D. Stern, "In Vivo Evaluation of Microcirculation by Coherent Light Scattering", Nature, vol. 254, Mar. 6, 1975.
Michael D. Stern & Donald L. Lappe, "Measurement of Local Tissue Blood Flow by Laser Doppler Spectroscopy", Federation Proceedings, vol. 35, No. 3, Mar. 1, 1976.
Gert Nilsson, Torsten Tenland & P. Ake Oberg, "A New Instrument for Continuous Measurement of Tissue Blood Flow by Light Beating Spectroscopy", IEEE Transactions on Biomedical Engineering, vol. BME-27, No. 1, Jan. 1980, pp. 12-19.
Gert Nilsson, Torsten Tenland & P. Ake Oberg, "Evaluation of a Laser Doppler Flowmeter for Measurement of Tissue Blood Flow", IEEE Transactions on Biomedical Engineering, vol. BME-27, No. 10, Oct. 1980, pp. 597-604.
Hanley John C.
Howell Kyle L.
Perimed KB
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