Surgery – Truss – Perineal
Patent
1975-07-17
1977-10-11
Kamm, William E.
Surgery
Truss
Perineal
73 675R, 128 205Z, 128 24A, A61B 1000
Patent
active
040529770
ABSTRACT:
A method and apparatus for obtaining an audible signal containing information as to the characteristics of at least one moving element situated internally of a living body and in which a transmitting transducer fed with an electrically generated signal of supersonic frequency transmits stress waves through the body tissue to the moving element to be investigated, and a receiving transducer receives reflected waves and feeds a received electrical signal to a receiver containing a multiplier or other modulator for generating an output signal of difference frequency in the audible range, and the transmitting signal is subjected to frequency sweep and has a mean value and a sweep which produce frequency variations in the electrical difference signal arising from change of position of the element under investigation and motion of this element, the electrical difference signal being fed to a transducer for audible reproduction of a sound pattern representative of the variations of position and motion of the element.
REFERENCES:
patent: 3172075 (1965-03-01), Kay
patent: 3366922 (1968-01-01), Kay
patent: 3568661 (1971-03-01), Franklin
patent: 3572099 (1971-03-01), Wieczorek
patent: 3631849 (1972-01-01), Norris
McCarty et al., "Medical & Biological Engineering", vol. 13, No. 1, Jan. 1975, pp. 59-64.
Satomura, "Journal of the Acoustical Society of America", vol. 29, No. 11, Nov. 1957, pp. 1181-1185.
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