Patents Assigned to CGR Ultrasonic
  • Patent number: 4729019
    Abstract: The method and the device provides for the automatic processing of digitalized signals in order toremove speckle from the said signals by comparing the digitalized signal with a noise model obtained after learning its statistical properties,extract, from the signals, echos not characteristic of the contour of the organ to be displayed,extract the characteristic parameters of the contour from the said signals,calculate the contour from these parameters by likening them to a pre-established model of variable parameters,combine the digitalized signal, before or after eliminating noise, with the signal that is characteristic of the estimated position of the contour,display the resultant signal in which the contour appears as an overlay.
    Type: Grant
    Filed: October 15, 1986
    Date of Patent: March 1, 1988
    Assignee: CGR Ultrasonic
    Inventor: Bernard Rouvrais
  • Patent number: 4694700
    Abstract: Ultrasonic sensor and echograph with static sectorial scanning, especially for a wide angle picture, wherein according to a possible embodiment, the sensor comprises several groups of transducer elements forming between one another obtuse angles in such a way as to define overall a convex outline so that the delays or lags necessary to obtain a complete scanning be lower than with a conventional linear strip and thus easier to contol, the sensor being intended to be applied to medical echography.
    Type: Grant
    Filed: September 25, 1985
    Date of Patent: September 22, 1987
    Assignee: CGR Ultrasonic
    Inventor: Charles Maerfeld
  • Patent number: 4680739
    Abstract: The present invention concerns a process for removing all ambiguity from the measurement by the Doppler effect of the speed of a target. It consists in obtaining a signal of Doppler shift relating to a series of ultrasonic pulses sent in the direction of the target and received after their reflection onto this target, the recurrence frequency of the pulses constituting an ambiguity limit of these speed measurements, wherein the measured Doppler shift is transposed by modulating the signal received by a signal at a frequency called determination frequency, so as to bring from a known value the spectral components to be analyzed in the useful measuring band and after measuring the true speed values are worked out by adjunction of a correction that depends upon the determination frequency that is used, this process being applicable to measuring the speed of blood in the medical field.
    Type: Grant
    Filed: April 4, 1985
    Date of Patent: July 14, 1987
    Assignee: CGR Ultrasonic
    Inventor: Olivier Lannuzel
  • Patent number: 4641660
    Abstract: An echography apparatus comprising a probe reconstituting mobile rings by element switching, said probe comprising a plurality of transducer elements spread over a convex coupling surface, and switching means being provided for grouping together certain transducer elements into rings.
    Type: Grant
    Filed: October 15, 1984
    Date of Patent: February 10, 1987
    Assignee: CGR Ultrasonic
    Inventor: Robert Bele
  • Patent number: 4619267
    Abstract: The invention relates to a method for characterizing the structure of a medium in which the ultrasonic absorption coefficient of the medium is measured. In order to perform a spectral analysis of this absorption, the spectrum of the signal reflected after it has been transmitted is evaluated by means of an autocorrelation method. Application: medical practice.
    Type: Grant
    Filed: December 14, 1984
    Date of Patent: October 28, 1986
    Assignee: CGR Ultrasonic
    Inventors: Olivier Lannuzel, Thierry Pradal
  • Patent number: 4583409
    Abstract: The invention relates to a method of measuring the flow parameters of a fluid, and to a device utilizing this method, in which the autocorrelation function of the signal transmitted back by a particle of the fluid in motion is calculated. The mean speed and the variance of the flow are calculated by calculating the derivations of orders 1 and 2 of this autocorrelation function.
    Type: Grant
    Filed: August 20, 1984
    Date of Patent: April 22, 1986
    Assignee: CGR Ultrasonic
    Inventors: Olivier Lannuzel, Thierry Pradal
  • Patent number: 4561308
    Abstract: A process of utilizing ultrasound for acquiring data representative of the internal portions of a structure and the display of the data thus obtained. This process includes the emitting of sequences of ultrasound to the structure under consideration and receiving therefrom corresponding echoes. For each sequence two groups of transducer elements are selected for generating ultrasound beams of possible N different focal characteristics sequentially. The ultrasound beams alternate from one group to the other except when a given beam corresponds to the most distant focal zone. In that case, the succeeding emission is carried out without alternating, i.e., the emission is generated from the same group.
    Type: Grant
    Filed: March 14, 1984
    Date of Patent: December 31, 1985
    Assignee: CGR Ultrasonic
    Inventors: Robert Bele, Gilbert Micaletti
  • Patent number: 4531412
    Abstract: An ultrasonic probe for accurately determining angular location includes a rotating mobile assembly with at least one angular location track placed thereon. The angular location track is inscribed with location data arranged in a succession of pulses. As the mobile assembly rotates, the track traces a path in space. A fixed reading unit is provided at a point along the path to read the data inscribed on the track. The read data contains information corresponding to the angular position of the mobile assembly at any given point in time.
    Type: Grant
    Filed: June 24, 1983
    Date of Patent: July 30, 1985
    Assignee: CGR Ultrasonic
    Inventors: Lucien Prud'hon, Robert Bele
  • Patent number: 4470017
    Abstract: The present invention relates to a linear voltage-pulse base-clipping circuit with adjustable-threshold condition.It comprises, for unipolar signals, two lines in parallel. The first line transmits the signal suitably delayed by means of an adjustable delay line to an attenuator which is controlled by the second control line which provides, depending on the threshold condition, the adjustment of the transfer of the attenuator.
    Type: Grant
    Filed: March 23, 1981
    Date of Patent: September 4, 1984
    Assignee: CGR Ultrasonic
    Inventor: Andre Eder
  • Patent number: 4340944
    Abstract: A probe primarily applicable to medical echography for achieving a variable compromise between depth of field and lateral resolution incorporates a main piezoelectric transducer, a plano-convex lens having an elastic diaphragm, an auxiliary transducer for measuring the deflection of the lens and means for controlling the deflection in dependence on a reference value by modifying the pressure exerted on the diaphragm by the fluid contained within the lens.
    Type: Grant
    Filed: March 6, 1981
    Date of Patent: July 20, 1982
    Assignee: CGR Ultrasonic
    Inventor: Jacques Dory
  • Patent number: 4209022
    Abstract: An ultra-sonic echography apparatus comprises a probe with multiple elements switched at the rate of transmission pulses and moved along a contour of the test body. Its position is registered by a pantograph cooperating with three sine-cosine potentiometers, the sine potentials of which control the horizontal deflection plates of a cathode-ray tube, while the cosine potentials control the vertical deflection plates and a fourth potentiometer adds potentials displaced by 90.degree. with respect to those delivered by the said three potentiometers, so as to control the beam position of the cathode ray tube for obtaining, on the screen thereof, a beam trace which is homothetic with respect to the ultrasonic beam in the test body.
    Type: Grant
    Filed: May 13, 1977
    Date of Patent: June 24, 1980
    Assignee: CGR Ultrasonic
    Inventor: Jacques Dory
  • Patent number: 4114456
    Abstract: Device for measuring the volume of sections of a tubular blank by ultrasonic echography. An ultrasonic pulse emitter -receiver is associated with an auxiliary reflector. The transducer and the auxiliary reflector are mounted on a rotary head. The blank moves forward continuously and the ultrasonic beam describes a helix on its surface. On basis of the measurement of the distances from the transducer to the outer and inner surfaces of the tube, a computer calculates the elementary areas and volumes and compares the sum of the elementary volumes with a reference value. The sections of constant weight are marked by a component controlled by the computer.
    Type: Grant
    Filed: May 19, 1977
    Date of Patent: September 19, 1978
    Assignee: CGR Ultrasonic
    Inventor: Jacques Dory
  • Patent number: D316376
    Type: Grant
    Filed: May 22, 1987
    Date of Patent: April 23, 1991
    Assignee: CGR Ultrasonic
    Inventor: Patrick G. Dubut
  • Patent number: D319793
    Type: Grant
    Filed: January 7, 1991
    Date of Patent: September 10, 1991
    Assignee: CGR Ultrasonic
    Inventor: Patrick Dubut