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4534359 Method and means for determing frequency selective tissue attenuation in a baseband ultrasonic imaging system
262
New Patents
waves in soft body tissue. The lens has a planar inner face butted against the planar transmitting and receiving faces of the transducers and a convexly curved outer face including two portions each extending over both transducers, one of such portions being smaller and more sharply curved than the other. The composite lens focuses the transmitted ultrasound waves in two zones overlapping in range so that the same transducer arrangement can be used in obtaining velocity information from deep or shallow blood vessels.
4534221 ULTRASONIC DIAGNOSTIC IMAGING SYSTEMS FOR VARYING DEPTHS OF FIELD Michael J Fife, Paul T Diaz, Dennis R Dietz assigned to Technicare Corporation
reflected ultrasonic waves passing through the tissue. In a baseband ultrasonic imaging system in which transducer generated signals are coherently detected by mixing the signals with a fixed frequency signal both in phase and in phase quadrature, a measure of frequency change in the reflected ultrasonic signal is obtained by measuring phase shift in a side band of the mixed signals.
4535759 ULTRASONIC MEDICAL INSTRUMENT Todd J Polk, James F Morrin assigned to Cabot Medical Corporation
An ultrasonic diagnostic imaging system is described in which a multi-element transducer array transmits a focused beam of energy from the transducer elements. As the depth of focus is varied between near and far field focusing under operator control, the nominal frequency of the transmitted ultrasound energy is varied correspondingly by the system, from relatively high frequency transmission in the near field to relatively low frequency transmission in the far field.
4534359 METHOD AND MEANS FOR DETERMINING FREQUENCY SELECTIVE TISSUE ATTENUATION IN A BASEBAND ULTRASONIC IMAGING SYSTEM
An ultrasonic friction reducing device is comprised of an ultrasonic generator having a special sweep frequency oscillator, a piezoelectric crystal transducer and a cervical dilator probe. The generator produces an oscillatory electric current for the operation of the device. The piezoelectric crystal transducer converts the oscillatory electric current produced by the generator into a vibratory mechanical motion. The transducer, through mechanical coupling, transmits the ultrasonic energy into the friction reducing probe.
4535781 MANUALLY ULTRASOUND
OPERATED APPLICATOR
Stockton M Miller-Jones, Stephen W Flax assigned to General Electric Company
Walter Hetz, Erlangen, Federal Republic Of Germany assigned to Siemens Aktiengesellschaft
Ultrasonic wave attenuation in passing through tissue is determined from frequency changes in
An ultrasonic transducer is pivotally attached to one end of an elongated handle which is divided
New Patents
waves in soft body tissue. The lens has a planar inner face butted against the planar transmitting and receiving faces of the transducers and a convexly curved outer face including two portions each extending over both transducers, one of such portions being smaller and more sharply curved than the other. The composite lens focuses the transmitted ultrasound waves in two zones overlapping in range so that the same transducer arrangement can be used in obtaining velocity information from deep or shallow blood vessels.
4534221 ULTRASONIC DIAGNOSTIC IMAGING SYSTEMS FOR VARYING DEPTHS OF FIELD Michael J Fife, Paul T Diaz, Dennis R Dietz assigned to Technicare Corporation
reflected ultrasonic waves passing through the tissue. In a baseband ultrasonic imaging system in which transducer generated signals are coherently detected by mixing the signals with a fixed frequency signal both in phase and in phase quadrature, a measure of frequency change in the reflected ultrasonic signal is obtained by measuring phase shift in a side band of the mixed signals.
4535759 ULTRASONIC MEDICAL INSTRUMENT Todd J Polk, James F Morrin assigned to Cabot Medical Corporation
An ultrasonic diagnostic imaging system is described in which a multi-element transducer array transmits a focused beam of energy from the transducer elements. As the depth of focus is varied between near and far field focusing under operator control, the nominal frequency of the transmitted ultrasound energy is varied correspondingly by the system, from relatively high frequency transmission in the near field to relatively low frequency transmission in the far field.
4534359 METHOD AND MEANS FOR DETERMINING FREQUENCY SELECTIVE TISSUE ATTENUATION IN A BASEBAND ULTRASONIC IMAGING SYSTEM
An ultrasonic friction reducing device is comprised of an ultrasonic generator having a special sweep frequency oscillator, a piezoelectric crystal transducer and a cervical dilator probe. The generator produces an oscillatory electric current for the operation of the device. The piezoelectric crystal transducer converts the oscillatory electric current produced by the generator into a vibratory mechanical motion. The transducer, through mechanical coupling, transmits the ultrasonic energy into the friction reducing probe.
4535781 MANUALLY ULTRASOUND
OPERATED APPLICATOR
Stockton M Miller-Jones, Stephen W Flax assigned to General Electric Company
Walter Hetz, Erlangen, Federal Republic Of Germany assigned to Siemens Aktiengesellschaft
Ultrasonic wave attenuation in passing through tissue is determined from frequency changes in
An ultrasonic transducer is pivotally attached to one end of an elongated handle which is divided