System and method for detection of motion

• US 6,964,640 B2
• Filed: 01/22/2003
• Issued: 11/15/2005
• Est. Priority Date: 01/22/2002
• Status: Expired due to Fees

• Current Assignee: P.M.G. Medica Ltd.
• Original Assignee: P M G Medica L I D
• Inventors: Zumeris, Jona, Levy, Jacob, Zumeris, Yanina
• Primary Examiner(s): Jaworski, Francis J.
• Application Number:
  US10/348,351
• Publication Number:
  US 20030153831A1
• Time in Patent Office: 1,028 Days
• Field of Search: 600/443, 600459-462, 600/437, 600/438, 600/447, 600454-456, 600/561, 600/587, 310330-334, 310/336, 736/02, 736/25
• US Class Current: 600/459
• CPC Class Codes: A61B 5/033 Uterine pressure
• CPC Class Codes: A61B 5/318 Heart-related electrical modalities, e.g. electrocardiography [ECG]
• CPC Class Codes: A61B 5/415 the glands, e.g. tonsils, adenoids or thymus
• CPC Class Codes: A61B 5/418 lymph vessels, ducts or nodes
• CPC Class Codes: A61B 8/02 Measuring pulse or heart rate
• CPC Class Codes: A61B 8/06 Measuring blood flow measuring volume flow in general G01F, e.g. G01F1/66, G01F1/72; measuring speed of fluids in general G01P5/00
• CPC Class Codes: A61B 8/0866 involving foetal diagnosis; pre-natal or peri-natal diagnosis of the baby
• CPC Class Codes: A61B 8/15 Transmission-tomography
• CPC Class Codes: A61B 8/4483 characterised by features of the ultrasound transducer
• CPC Class Codes: A61B 8/488 involving Doppler signals
• CPC Class Codes: A61B 8/56 Details of data transmission or power supply
• CPC Class Codes: G01S 15/8913 using separate transducers for transmission and reception
• CPC Class Codes: G01S 15/8915 using a transducer array
• CPC Class Codes: G01S 15/8922 the array being concentric or annular
• CPC Class Codes: G01S 15/8979 Combined Doppler and pulse-echo imaging systems
• CPC Class Codes: G01S 7/52079 Constructional features constructional features of transducers B06B; mounting transducers G10K11/00; constructional features of ultrasonic medical diagnostic devices A61B8/44

Abstract

As part of the present invention, a motion detector for detecting motion inside of a body may include a first oscillator to produce an electrical scanning signal and a second oscillator to produce an electrical Doppler signal. A vibrating element may vibrate in response to the scanning and Doppler signals. A vibration transducer may receive vibrations reflected from a structure inside the body and may convert the reflected vibrations into an electrical signal. Doppler shifts between the transmitted and received vibrations may be used to estimate the velocity of the structure inside the body.

Claims

1. A method of detecting motion inside of a body, the method comprising:

providing an electrical signal to a piezoceramic transducer at a first frequency, to cause said transducer to transmit thickness vibrations to a target area;

providing an electrical signal to said piezoceramic transducer at a second frequency, said second frequency being a lower frequency than said first frequency, to cause said transducer to generate bending vibrations, thereby causing said thickness vibrations transmitted from said transducer to scan a relatively wide target area; and

receiving vibrations to said piezoceramic transducer, said vibrations resulting from said thickness vibrations being reflected from an element inside said wide target area.

2. The method of claim 1, further comprising calculating a velocity of a structure inside said wide target area by using a Doppler effect based on the reflected vibrations.

3. The method of claim 1, further comprising altering the pattern electrical signals provided to said transducer.

4. The method of claim 3, further comprising altering the pattern of vibrations emitted by said transducer.

5. The method according to claim 1, wherein said first frequency is in the MHZ range and said second frequency is in the KHZ range.

6. The method of claim 1, wherein said signal is selected from the group consisting of a burst wave input, a continuous wave input, and a standing wave input.

7. The method of claim 1 comprising configuring said at least one piezoceramic transducer to achieve variability in scanning.

8. The method of claim 1, comprising scanning said target area in the x, y, and z axes.

9. The method of claim 1, wherein said transducer enables mechanical scanning of said target at a wide range of angular orientations.

10. The method according to claim 1, comprising generating bending vibration waves that cause planar vibrations within said transceiver, thereby providing an angle suitable for receiving reflected vibrations from said relatively wide target area.

11. The method according to claim 1, comprising generating vibrations using a multi-block piezo-ceramic transceiver unit.

12. A motion detecting apparatus for detecting motion inside of a body, said apparatus comprising:

a piezoceramic transducer;

a first oscillator to provide an electrical signal to said piezoceramic transducer at a first frequency, to generate thickness vibrations for transmission to a target area;

a second oscillator to provide an electrical signal to said piezoceramic transducer at a second frequency, said second frequency being at a lower frequency than said first frequency, said signal being capable to cause said transducer to generate bending vibrations, thereby scanning a relatively wide target area; and

wherein said piezoceramic transducer is to receive vibrations reflected from said relatively wide target area, and to convert the reflected vibrations into electrical signals.

13. The motion detector according to claim 12, further comprising a signal detector to detect the electrical signals produced by said transducer.

14. The motion detector according to claim 12, further comprising a switching gate to switch the signal applied to said transducer between higher frequency signals and said lower frequency signals.

15. The motion detector according to claim 12, wherein said piezo-ceramic transducer has an opening.

16. The motion detector according to claim 12, wherein said transducer includes at least one transmitting element and at least one receiving element, said transmitting element(s) and said receiving element(s) being enabled to scan said relatively wide target area.

17. The motion detector according to claim 16, wherein electrical signals from said first and second oscillators are applied to all said transmitting elements and said receiving elements.

18. The motion detector according to claim 12, wherein said first oscillator produces an electric signal in the Megahertz range and said second oscillator produces an electric signal in the Kilohertz range.

19. The apparatus according to claim 12, further comprising a housing which is at least partially clear for said transducer.

20. The apparatus of claim 12 wherein said first oscillator is configured to provide an input selected from the group consisting of burst wave input, continuous wave input and standing vibration wave input.

21. The apparatus of claim 12, wherein said at least one piezoceramic transducer is configured to achieve variability in scanning.

22. The apparatus of claim 12, comprising a first piezo-ceramic transceiver unit and a second piezo-ceramic transceiver unit, wherein said first transducer is to provide a transmitting frequency of 5 MHz and said second transducer is to provide a transmitting frequency of 8 MHz.

23. The apparatus of claim 12, wherein said transducer scans a target using a wide angular range.

24. The apparatus of claim 23, wherein said angular range is determined by one or more of operations selected from the group consisting of attaching said transducer in one or more selected ways, the voltage applied to said transducer, and the frequency of signals applied to said transducer.

25. The apparatus according to claim 12, wherein said detecting apparatus is included within a chip.