Device and method for locating flow blockage in a three-dimensional object

• US 5,617,869 A
• Filed: 06/16/1995
• Issued: 04/08/1997
• Est. Priority Date: 06/16/1995
• Status: Expired due to Term

• Current Assignee: the united states of america as represented by the secretary of the navy
• Original Assignee: the united states of america as represented by the secretary of the navy
• Inventors: Peloquin, Mark S., Austin, Stephen A., Hull, Andrew J., Owsley, Norman L.
• Primary Examiner(s): Cohen, Lee S.
• Assistant Examiner(s): Huang, Stephen D.
• Application Number:
  US08/491,385
• Time in Patent Office: 662 Days
• Field of Search: 128/672, 128/675, 128/677, 128/687, 128/691
• US Class Current: 600/504
• CPC Class Codes: A61B 5/02007 Evaluating blood vessel condition, e.g. elasticity, compliance
• CPC Class Codes: A61B 5/026 Measuring blood flow A61B3/1233, A61B3/1241 take precedence

Abstract

A method and apparatus for locating artery stenoses in blood vessels incls providing an array of sensors on skin surface to acquire data for detecting, locating and analyzing energy emissions in three-dimensional objects. The array detects momentum transfer that exists in the object in the form of wave energy, and the detection is designed to occur on the surface of the object, thereby providing a non-intrusive method for locating artery stenoses, with localization of the artery stenoses being achieved through array signal processing by information detected on the surface of the skin with the plurality or array of sensors.

Claims

1. A method for detecting arterial blockage in a body containing blood vessels, comprising the steps of:

positioning an array of sensors on a surface of the body;

detecting waveform energy on the body surface by said positioned array of sensors;

identifying a change in waveform energy on the surface of the body by at least one sensor in said array of sensors;

determining at least spectral, directional, and intensity waveform energy characteristics sensed by each sensor in said array of sensors; and

locating the arterial blockage from said waveform energy characteristics, wherein said step of positioning includes spacing each sensor in said array from an adjacent sensor by a distance at least one-half wavelength of the waveform energy being measured.

2. The method according to claim 1 wherein the waveform energy detected is vibrational energy having compressional waves, shear waves and Raleigh surface waves.

3. The method according to claim 2 wherein the array of sensors comprises a plurality of sensors selected from the group of vibrational sensors including accelerometers, hydrophones, microphones, laser velocimeters, strain gages, and motion detectors.

4. The method according to claim 3 wherein said array is a linear arrangement of sensors.

5. The method according to claim 3 wherein said array is a two-dimensional arrangement of sensors.

6. The method according to claim 3 wherein said array is a three-dimensional arrangement of sensors.

7. The method according to claim 1 wherein said array is a linear arrangement of sensors.

8. The method according to claim 1 wherein said array is a two-dimensional arrangement of sensors.

9. The method according to claim 1 wherein said array is a three-dimensional arrangement of sensors.

10. A device for detecting arterial stenoses within a body containing blood vessels, comprising:

a sensor array adapted to be positioned on the surface of the body, each sensor in said sensor array detecting waveform energy on a surface of the body and outputting a representative analog signal;

means for converting the analog waveform signal to a digital signal;

a microprocessor unit, responsive to said converted digital signal, for reducing background noise and identifying variations in waveform energy at the surface of the body, comparing variations in waveform energy, and thereby localizing an origin of the arterial blockage; and

display means joined to said microprocessor unit for displaying the localized origin of the arterial blockage, wherein each sensor in said array of sensors is spaced from an adjacent sensor by a distance one-half of the wavelength of the waveform energy being measured.

11. The device according to claim 10 wherein the waveform energy detected include compressional waves, shear waves and Raleigh surface waves.

12. The device according to claim 11 wherein the sensors in the array include at least one of accelerometers, hydrophones, microphones, laser velocimeters, strain gages and motion detectors.

13. The device according to claim 12 wherein said array is linear.

14. The device according to claim 12 wherein said array is two-dimensional.

15. The device according to claim 12 wherein said array is three-dimensional.

16. The device according to claim 10 wherein said array is linear.

17. The device according to claim 10 wherein said array is two-dimensional.

18. The device according to claim 10 wherein said array is three-dimensional.