Patents by Inventor Hiroshi Fukukita

Hiroshi Fukukita has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6774540
    Abstract: Herein disclosed is a sound converting apparatus for performing conversion between electric signals and ultrasonic waves, comprising: a plurality of oscillation bodies for emitting ultrasonic waves converted from the electric signals along a wave propagating direction Dp; and a plurality of electrically conductive bodies each for electrically connecting the oscillation bodies; a plurality of signal lines for inputting electric signals to be applied to respective oscillation bodies; a pair of external electrodes respectively held in contact with the outer surfaces of respective piezoelectric layers and electrically connected with the electrically conductive bodies; and a dividing electrode sandwiched by and held in contact with the inner surfaces of the piezoelectric layers and electrically connected with the signal line, whereby the piezoelectric layers respectively generate electric polarizations, directions of which are opposing to each other and extending substantially parallel to an azimuthal direction Da
    Type: Grant
    Filed: April 19, 2002
    Date of Patent: August 10, 2004
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventor: Hiroshi Fukukita
  • Patent number: 6572552
    Abstract: An ultrasonic diagnostic apparatus for observing a detectable object to be ultrasonically diagnosed. The apparatus includes an ultrasonically diagnostic probe unit for probing the object with ultrasonic waves in response to input pulse signals and with an ultrasonic echo from the object, a signal transmitting unit to generate the input pulse signals, a signal receiving unit for receiving the ultrasonic echo and processing output signals to be converted into an image of the object, and a display unit to display the image.
    Type: Grant
    Filed: July 31, 2001
    Date of Patent: June 3, 2003
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventor: Hiroshi Fukukita
  • Publication number: 20020167249
    Abstract: Herein disclosed is a sound converting apparatus for performing conversion between electric signals and ultrasonic waves, comprising: a plurality of oscillation bodies for emitting ultrasonic waves converted from the electric signals along a wave propagating direction Dp; and a plurality of electrically conductive bodies each for electrically connecting the oscillation bodies; a plurality of signal lines for inputting electric signals to be applied to respective oscillation bodies; a pair of external electrodes respectively held in contact with the outer surfaces of respective piezoelectric layers and electrically connected with the electrically conductive bodies; and a dividing electrode sandwiched by and held in contact with the inner surfaces of the piezoelectric layers and electrically connected with the signal line, whereby the piezoelectric layers respectively generate electric polarizations, directions of which are opposing to each other and extending substantially parallel to an azimuthal direction Da
    Type: Application
    Filed: April 19, 2002
    Publication date: November 14, 2002
    Inventor: Hiroshi Fukukita
  • Patent number: 6425872
    Abstract: A physical parameter measuring system is provided which measures a physical parameter such as a blood pressure of a person using oscillation transmission. The system includes a phase detector, an A/D converter, an arc center determining circuit, and a phase angle determining circuit. The phase detector detects a phase of a sensor signal produced, in sequence, by monitoring oscillations which are applied by an exciter and transmitted through a living body to map the signal on a two-dimensional plane as a sample point. The A/D converter converts the sample point signal into a digital sample point signal in sequence. The arc center determining circuit determines a center of an arc defined by a distribution of the sample points mapped for a given period of time.
    Type: Grant
    Filed: October 18, 2000
    Date of Patent: July 30, 2002
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hisashi Hagiwara, Hiroshi Fukukita, Kinya Hasegawa, Yushi Nishimura
  • Publication number: 20020042572
    Abstract: Herein disclosed is an ultrasonic diagnostic apparatus for observing a detectable object to be ultrasonically diagnosed. This apparatus comprises an ultrasonically diagnostic probe unit for probing the detectable object with the ultrasonic waves in response to input pulse signals and with the ultrasonic echo from the detectable object, a signal transmitting unit operatively connected with the ultrasonic diagnostic probe unit to generate the input pulse signals to be transmitted into the ultrasonic waves, a signal receiving unit operatively connected with the ultrasonically diagnostic probe unit for receiving the ultrasonic echo from the detectable object and processing output signals to be converted into the image of the object being observed, a display unit connected with the signal receiving unit to display the image of the object based on the output signals from the signal receiving unit to ensure the ultrasonically diagnosed state of the detectable object.
    Type: Application
    Filed: July 31, 2001
    Publication date: April 11, 2002
    Inventor: Hiroshi Fukukita
  • Patent number: 6364836
    Abstract: An ultrasound diagnostic apparatus includes a probe which outputs RF signals. There are N phase detectors for converting the RF signals outputted from the probe into baseband signals In and Qn, where “N” denotes a first predetermined natural number and “n” denotes a second predetermined natural number set as 2≦n≦N. A reception beam former operates for processing the baseband signals In and Qn into a time-division-multiplexed signal. The reception beam former includes a device for multiplying the baseband signals In and Qn by phase shift data to generate multiplication-resultant signals, a device for delaying the multiplication-resultant signals to generate delay-resultant signals, and a device for combining the delay-resultant signals into the time-division-multiplexed signal.
    Type: Grant
    Filed: August 8, 2000
    Date of Patent: April 2, 2002
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hiroshi Fukukita, Morio Nishigaki, Hisashi Hagiwara
  • Patent number: 6354998
    Abstract: A blood pressure determining apparatus is provided which applies oscillations to the blood vessel of a subject through an exciter to determine the blood pressure based on the frequency of the oscillations propagated through the blood vessel measured by an oscillation sensor. The apparatus monitors an output of the oscillation sensor when the exciter applies no oscillation to the subject to determine the power spectrum of noise signals contained in the output and sets the frequency of oscillations to be applied to the blood vessel to any value within a band of the power spectrum in which the power of noise is small. This enables the blood pressure to be determined without influence of any electric disturbances from peripheral devices.
    Type: Grant
    Filed: July 14, 2000
    Date of Patent: March 12, 2002
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hisashi Hagiwara, Hiroshi Fukukita, Kinya Hasegawa, Yushi Nishimura
  • Patent number: 6344023
    Abstract: A nonlinear distortion-based ultrasonic diagnostic imaging system displays a raised-resolution video of tissue inside a body at an increased frame rate. Using a two-pulse technique, a transducer driver supplies narrower-width and wider-width driving pulses to a transducer, which transmits weaker and stronger ultrasonic wave pulses alternately while putting the same intervals between adjacent ultrasonic wave pulses to obtain a weaker echo and a stronger echo. An equalizer equalizes each weaker echo to the stronger echo into an equalized weaker echo. An interpolator calculates an interpolation value between the equalized weaker echo and an equalized previous weaker echo obtained from a previous weaker echo. For each weaker ultrasonic wave pulse, a detector finds a difference between the interpolation value and a stronger echo obtained between the weaker echo and the previous weaker echo. The equalization and interpolation enables high-speed scanning, which has not been achieved with two-pulse technique.
    Type: Grant
    Filed: October 31, 2000
    Date of Patent: February 5, 2002
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hiroshi Fukukita, Morio Nishigaki, Takao Suzuki
  • Patent number: 6275447
    Abstract: A sound generating apparatus or a sound detecting apparatus includes: a flexible substrate; and a plurality of bimorphs arranged on a surface of the flexible substrate in a direction at a predetermined interval, each of the bimorphs having input/output terminals. Each of the bimorphs has a rectangular shape and its longitudinal direction is perpendicular to the direction. The flexible substrate has a slit between successive two of the bimorphs. A width of the slit outside the bimorphs is wide. A buffering material covering surfaces of the flexible substrate with the bimorphs exposed or a cover covering the bimorphs with a space may be provided. The cover and the buffering material may have slit. A sound generating apparatus including a plurality of flexible substrates respectively supporting bimorphs may be provided. The flexible substrate may have a comb shape.
    Type: Grant
    Filed: February 10, 1999
    Date of Patent: August 14, 2001
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hiroshi Fukukita, Hisashi Hagiwara
  • Patent number: 6106469
    Abstract: First 1-sound-line received signals are successively generated from an output signal of a transducer. One is selected from among the generated first 1-sound-line received signals as a 1-sound-line received signal of interest. Second 1-sound-line received signals are selected from among the generated first 1-sound-line received signals. The second 1-sound-line received signals include a 1 -sound-line received signal preceding the 1-sound-line received signal of interest and also a 1-sound-line received signal following the 1-sound-line received signal of interest. The second 1-sound-line received signals are averaged into a mean 1-sound-line received signal which corresponds to an undesired multiple-echo signal. The mean 1-sound-line received signal is subtracted from the 1-sound-line received signal of interest to remove the undesired multiple-echo signal from the 1-sound-line received signal of interest.
    Type: Grant
    Filed: April 26, 1999
    Date of Patent: August 22, 2000
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Takao Suzuki, Hisashi Hagiwara, Hiroshi Fukukita
  • Patent number: 6099472
    Abstract: An ultrasonic diagnostic system includes a transducer. A first electric drive signal is fed to the transducer. A second electric drive signal is fed to the transducer at a time different from a time of the feed of the first electric drive signal thereto. The second electric drive signal has a waveform different from a waveform of the first electric drive signal. A first received signal is derived from an output signal of the transducer. The first received signal represents ultrasonic echoes related to an ultrasonic beam caused by the transducer in response to the first electric drive signal. A second received signal is derived from the output signal of the transducer. The second received signal represents ultrasonic echoes related to an ultrasonic beam caused by the transducer in response to the second electric drive signal.
    Type: Grant
    Filed: April 26, 1999
    Date of Patent: August 8, 2000
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hiroshi Fukukita, Morio Nishigaki
  • Patent number: 5419333
    Abstract: An ultrasonic Doppler blood flow meter apparatus includes a wall filter for eliminating clutter from an echo signal of an ultrasonic pulse signal sent to a living being under test. The wall filter includes a switch for cutting a part of input data and a control unit for controlling the switch such that the switch is opened during a period in which first m data (where m is integer) is inputted to undergo filtering by the wall filter while the switch is closed during a period in which data following the (m+1)-th data inclusive thereof are inputted.
    Type: Grant
    Filed: February 28, 1994
    Date of Patent: May 30, 1995
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hisashi Hagiwara, Hiroshi Fukukita, Morio Nishigaki, Yoshihiko Ito
  • Patent number: 5419330
    Abstract: In an ultrasonic diagnostic equipment for performing synthetic aperture, deterioration of picture quality produced by the movement of an object is prevented, thereby to provide an excellent image. Arrayed piezoelectric transducers are driven by a transmitting circuit so as to transmit ultrasonic waves into a body, and, among echoes received by piezoelectric transducers, first the signals of the piezoelectric transducers are selected by amplified appropriately by amplifiers and converted into digital signals by added with delay by a beam former thereafter, and stored in a memory. Similarly, the ultrasonic waves are transmitted again, signals of the piezoelectric transducers are selected by the applied with similar signal processing in the amplifiers, and the beam former, and added to signals added with delay of the piezoelectric transducers T3 to T6 stored in a memory 16 by an adder.
    Type: Grant
    Filed: August 23, 1994
    Date of Patent: May 30, 1995
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Morio Nishigaki, Hiroshi Fukukita, Hisashi Hagiwara
  • Patent number: 5388079
    Abstract: In accordance with the principles of the present invention, advantage is taken by the inventors of the fact that the speed of operation of the digital hardware in a digital beamformer can be reduced by providing, for example, multiple phases of the data signals and then processing the multi-phase data in N parallel summing paths. An interpolation-decimation filter receives the multi-phase data from the N parallel summing paths and provides at its output a signal having a reduced data rate (1/N). In accordance with this technique, the speed of operation of the individual digital circuits for forming the required beamforming delays is not increased as compared to conventional post-beamforming interpolation schemes, so that hereby the effective data rate is increased by a factor N and results in a decrease of the delay quantization error by a factor N. In accordance with the principles of the invention, the interpolation-decimation filter is incorporated into the beamformer at a most advantageous place.
    Type: Grant
    Filed: March 26, 1993
    Date of Patent: February 7, 1995
    Assignee: Siemens Medical Systems, Inc.
    Inventors: Jin Kim, Lin X. Yao, Zoran Banjanin, Hiroshi Fukukita, Hisashi Hagiwara, Masami Kawabuchi
  • Patent number: 5369624
    Abstract: In accordance with the principles of the present invention, advantage is taken by the inventors of the fact that the speed of operation of the digital hardware in a digital beamformer having a plurality of parallel receiving channels can be reduced by providing multiple phases for the data signals supplied by each receiving channel and then processing the multi-phase data in N parallel summing paths. An interpolation-decimation filter receives the multi-phase data from the N parallel summing paths and provides at its output a signal having a reduced data rate (1/N). In accordance with this technique, the speed of operation of the individual digital circuits for forming the required beamforming delays are not increased as compared to conventional post-beamforming interpolation schemes, so that hereby the effective data rate is increased by a factor N and the delay quantization error is reduced by a factor N.
    Type: Grant
    Filed: March 26, 1993
    Date of Patent: November 29, 1994
    Assignees: Siemens Medical Systems, Inc., Matsushita Electrical Industrial Co. Ltd.
    Inventors: Hiroshi Fukukita, Lin X. Yao, Zoran Banjanin, Jin Kim, Hisashi Hagiwara, Masami Kawabuchi
  • Patent number: 5311870
    Abstract: An ultrasonic Doppler imaging apparatus emits ultrasonic pulse waves to an object body under test and provides information on blood flow in the body based on Doppler shifts of ultrasonic waves reflected back from the object body. The ultrasonic pulse waves emitted by a probe to the object body undergo Doppler shifts by being reflected by the blood stream, and the reflected ultrasonic waves received by the probe are decomposed with an A/D converter in synchronism with emission. The decomposed data are transformed into complex Doppler data through a quadrature addition/subtraction by quadrature addition/subtraction means. The complex Doppler data is subjected to frequency analysis through correlative computation or the like, and resulting data is stored in a frame memory and displayed. The apparatus is capable of measuring the Doppler shift frequency accurately.
    Type: Grant
    Filed: May 5, 1992
    Date of Patent: May 17, 1994
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hiroshi Fukukita, Hisashi Hagiwara, Morio Nishigaki, Yasuhiro Nakamura
  • Patent number: 5269308
    Abstract: Disclosed is an ultrasonic Doppler imaging apparatus in which the velocity of a blood flow in a living body can be computed with high precision without increasing a scale of a signal processing circuit, so that a Doppler color image having satisfactory image quality is displayed. In the apparatus, an ultrasonic pulse signal is transmitted into the living body and is reflected from a target in the living body to be received by an ultrasonic probe, and the reception signal is subjected to quadrature phase detection to obtain an I signal and a Q signal. When an amplitude evaluating unit evaluates on the basis of the intensity of the I and Q signals that the reception signal contains many clutter components, a cut-off frequency of high-pass filters is increased by the application of a control signal (A) to thereby eliminate low-frequency clutter components. The outputs of the high-pass filters are converted into blood flow velocity information to be displayed as a Doppler color image.
    Type: Grant
    Filed: July 13, 1992
    Date of Patent: December 14, 1993
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hisashi Hagiwara, Hiroshi Fukukita, Morio Nishigaki
  • Patent number: 5263483
    Abstract: A beam former for a ultrasonic diagnostic apparatus is arranged to have low-bit analog-to-digital converters and enables to obtain an excellent echo signal from blood flow. The beam former further includes a sample and hold circuit for sampling an echo signal of a pulse reflected from the inside of a human body. A delaying circuit serves to delay the output of the sample and hold circuit by a delay time corresponding to an integer multiple of a transmitted pulse period and is subtracted from the output of the sample and hold circuit. The subtracted output is analog-to-digital converted and is stored in a memory. The memory reads out the data asynchronously with the storage. The delaying circuit is composed of an analog-to-digital converter, a memory and a digital-to-analog converter and has a delay time corresponding to an integer multiple of the transmitted pulse period.
    Type: Grant
    Filed: November 16, 1992
    Date of Patent: November 23, 1993
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Morio Nishigaki, Hiroshi Fukukita, Hisashi Hagiwara
  • Patent number: 5261407
    Abstract: There is provided an ultrasonic Doppler blood-flow meter which can suppress the occurrence of unwanted frequency components by suppressing the jump of signal to thereby produce images of high quality A DC feedback circuit is provided which negatively feeds back a Doppler deviated signal produced from an integrator to the input thereof. The feedback amount of the DC feedback circuit is changed in synchronism with the timing for switching between the B-mode transmission/reception sequence and the Doppler mode sequence to prevent a jump of a signal at the commencement of the Doppler mode. The feedback amount of the DC feedback circuit is made to be different for the gate moving sequence and the Doppler mode sequence, thereby preventing a jump of a transient signal due to a discontinuous input signal at the commencement of the Doppler mode.
    Type: Grant
    Filed: November 22, 1991
    Date of Patent: November 16, 1993
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Mori Nishigaki, Hiroshi Fukukita, Hisashi Hagiwara, Junichiro Ninomiya
  • Patent number: 5220923
    Abstract: An ultrasonic Doppler blood flowmeter has a Doppler scanning mode of operation to obtain information about blood speed and a B mode of operation to obtain information for a tomogram. In order to produce supplementary Doppler shift data for use during a B-mode scanning period, Doppler shift data from a phase detector is treated as complex data, and the difference in argument between two consecutive, complex Doppler shift data is detected. The supplementary Doppler shift data can then be calculated by an arithmetic circuit on the basis of the difference in argument between the consecutive complex Doppler shift data.
    Type: Grant
    Filed: August 16, 1991
    Date of Patent: June 22, 1993
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hisashi Hagiwara, Hiroshi Fukukita, Yoshinobu Watanabe, Yoshinao Tannaka