Active attenuation system for medical patients

• US 5,313,945 A
• Filed: 06/11/1990
• Issued: 05/24/1994
• Est. Priority Date: 09/18/1989
• Status: Expired due to Term

• Current Assignee: Noise Cancellation Technologies, Inc. (NCT Group, Inc.)
• Original Assignee: Noise Cancellation Technologies, Inc. (NCT Group, Inc.)
• Inventors: Friedlander, Paul
• Primary Examiner(s): Cohen, Lee S.
• Assistant Examiner(s): Pfaffle, Krista M.
• Application Number:
  US07/543,854
• Time in Patent Office: 1,443 Days
• Field of Search: 128/653 A, 128/653 C, 128/653 A, 128/653.2, 324/300, 324/318, 331/71, 331/94
• US Class Current: 600/410
• CPC Class Codes: A61B 5/055 involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
• CPC Class Codes: G01R 33/3854 means for active and/or passive vibration damping or acoustical noise suppression in gradient magnet coil systems

Abstract

An apparatus and method of actively cancelling undesirable acoustic noise generated by a patient diagnosing apparatus during a diagnosis operation which includes a remotely located active noise cancellation unit. The undesirable acoustic noise is transferred via hollow tubes from the patient diagnosing apparatus to the remote location to be detected thereat. A control unit thereafter generates cancellation waves based upon the detected undesirable acoustic noise. The cancellation waves are transferred to the patient area via additional hollow tubes to cancel the undesirable acoustic noise. The use of hollow tubes of non-magnetic, non-metallic material ensures that the undesirable acoustic noise and the cancellation waves do not interfere with the diagnosis of operation.

Claims

1. A patient diagnosing apparatus comprising:

patient accommodating means for holding a patient in a predetermined position in an ambient environment;

diagnosing means operatively coupled to and surrounding said patient accommodating means, for diagnosing a medical condition of the patient, said diagnosing means generating undesirable acoustic noise in an area of the patient during a diagnosis operation; and

active noise cancellation means, adapted to be coupled to the patient for canceling the undesirable acoustic noise generated by said diagnosing means in said area of the patient, said active noise cancellation means comprising;

first non-magnetic, nonmetallic flexible sound propagating means for carrying said undesirable acoustic noise, and

noise detection means, for detecting the undesirable acoustic noise in the area of the patient and located remotely from said patient accommodating means and adapted to be coupled to the patient through said first non-magnetic, non-metallic flexible sound propagating means so that detection of the undesirable acoustic noise does not interfere with operation of said diagnosing means, and

second non-magnetic, non-metallic flexible sound propagating means, for carrying counternoise waves, and

counternoise speaker means, for generating and transmitting said counternoise waves to the patient based upon the detected undesirable acoustic noise, to cancel the undesirable acoustic noise in the area of the patient, said counternoise speaker means adapted to be located remotely from said patient accommodating means and adapted to be coupled to the patient through said second non-magnetic, non-metallic flexible sound propagating means so that transmission of said counternoise waves does not interfere with operation of said diagnosing means.

2. The patient diagnosing apparatus according to claim 1, wherein said first and second sound propagating means are hollow tubes filled with a sound wave propagating medium.

3. The patient diagnosing apparatus according to claim 1 further comprising:

a headset including a pair of ear coupling means for coupling said counternoise waves to the auditory system of the patient, said noise detection means and said counternoise speaker means being coupled to said ear coupling means through said first and second sound propagating means respectively; and

control means coupled to said noise detection means and said counternoise speaker means for controlling generation of said counternoise waves of respective channels for each respective one of said ear coupling means as a function of said detected undesirable acoustic noise detected at each respective one of said ear coupling means.

4. The patient diagnosing apparatus according to claim 3, wherein said first and second sound propagating means are hollow tubes filled with a sound wave propagating medium.

5. The patient diagnosing apparatus according to claim 3, wherein each of said ear coupling means comprises cup-shaped means adapted to be fitted on the patient so that the patient'"'"'s ears are isolated from said ambient environment.

6. The patient diagnosing apparatus according to claim 3, wherein each of said ear coupling means comprise respective open-ear coupling means for fitting on the patient.

7. A patient diagnosing apparatus comprising:

patient accommodating means for holding a patient in a predetermined position;

diagnosing means, operatively coupled to and surrounding said patient accommodating means, for diagnosing a medical condition of the patient, said diagnosing means generating undesirable acoustic noise in an area of the patient during a diagnosis operation; and

active acoustic noise cancellation means, coupled to said diagnosing means, for canceling the undesirable acoustic noise generated by said diagnosing means in the area of the patient, said active acoustic noise cancellation means comprising

first non-magnetic, non-metallic flexible sound propagating means adapted to carry undesirable acoustic noise, and

noise detection means, for detecting the undesirable acoustic noise in the area of the patient, located remotely from said patient accommodating means and coupled to said diagnosing means through said first non-magnetic, non-metallic flexible sound propagating means so that detection of the undesirable acoustic noise does not interfere with the operation of said diagnosing means, and

second non-magnetic, non-metallic flexible sound propagating means, adapted to carry counternoise waves, and

counternoise speaker means, for generating and transmitting said counternoise waves to the patient based upon the detected undesirable acoustic noise, to cancel the undesirable acoustic noise in the area of the patient, said counternoise speaker means located remotely from said patient accommodating means and coupled to said diagnosing means through said second non-magnetic, non-metallic flexible sound propagating means so that transmission of the counternoise waves does not interfere with operation of said diagnosing means.

8. The patient diagnosing apparatus according to claim 7, wherein said first and second sound propagating means are elongated hollow tubes filled with a sound wave propagating medium.

9. The patient diagnosing apparatus according to claim 8, wherein said sound wave propagating medium is air.

10. The patient diagnosing apparatus according to claim 7, wherein said diagnosing means includes magnetic resonance scanning means for scanning patient for diagnostic purposes.

11. The patient diagnosing apparatus of claim 7, said active noise cancellation means further comprising:

control means, coupled to said noise detection means and said counternoise speaker means, for controlling generation of said counternoise waves of respective channels for each respective ear of the patient as a function of said detected undesirable acoustic noise detected at each respective ear.

12. A method of canceling undesirable acoustic noise generated by diagnosing means in the area of a patient'"'"'s ear during a patient diagnosis operation, comprising the steps of:

transferring the undesirable noise generated by the diagnosing means from the area of the patient'"'"'s ear to a remote location via first elongated, flexible non-magnetic sound propagating means;

detecting the transferred undesirable acoustic noise using noise detection means at the remote location so that said detecting does not interfere with the patient diagnosis operation;

generating counternoise waves using control means at the remote location based upon the detected undesirable acoustic noise so that said generating does not interfere with the patient diagnosis operation; and

transferring the counternoise waves generated by the control means from the remote location to the area of the patient'"'"'s ear via second elongated, flexible non-magnetic, non-metallic sound propagating means to cancel the undesirable acoustic noise in the immediate area of the patient'"'"'s ear.

13. The method of cancelling undesirable acoustic noise of claim 12, wherein said steps of transferring comprises the steps of transferring the undesirable acoustic noise and the counternoise waves via hollow tubes filled with a sound propagating medium.

14. The method of cancelling undesirable acoustic noise of claim 13, wherein said steps of transferring comprises the steps of transferring the undesirable acoustic noise and the counternoise waves via hollow tubes filled with air.

15. The method of cancelling undesirable acoustic noise of claim 13, wherein said steps of transferring comprises the steps of transferring the undesirable acoustic noise and the counternoise waves via hollow tubes filled with liquid.

16. The method of cancelling undesirable acoustic noise of claim 13, said steps of transferring comprising:

transferring the undesirable acoustic noise from the area of the patient to the remote location and the counternoise waves from the remote location to the area of the patient via a headset including cup-like ear coupling means so that the ears of the patient are isolated from the undesirable acoustic noise.

17. The method of cancelling undesirable acoustic noise of claim 13, said steps of transferring comprising:

transferring the undesirable acoustic noise from the area of the patient to the remote location and the counternoise wave from the remote location to the area of the patient via said first and second sound propagating means which are operatively coupled to the diagnosing means.

18. A noise cancellation system for a patient diagnosis apparatus comprising:

active noise cancellation means, located remotely from the patient diagnosis apparatus, for cancelling undesirable acoustic noise generated by the patient diagnosis apparatus in an area of a patient during a diagnosis operation, said active noise cancellation means comprising

first and second microphones for detecting the undesirable acoustic noise in respective first and second areas immediately near the ears of the patient,

control means, coupled to said first and second microphones, for generating respective first and second cancellation waves based upon the undesirable acoustic noise of said first and second areas, and

first and second speakers, coupled to said control means, for respectively transmitting said first and second cancellation waves to said first and second areas to cancel the undesirable acoustic noise, and

non-magnetic, non-metallic sound propagating means, coupled to said active noise cancellation means, said propagating means adopted to transfer the undesirable acoustic noise from said first and second areas to said first and second microphones and for transferring said first and second cancellation waves from said first and second speakers to said first and second areas.

19. The noise cancellation system of claim 18, wherein said sound propagating means comprises hollow tubes filled with a sound propagating medium.

20. The noise cancellation system of claim 19, wherein said sound propagating medium is air.

21. The noise cancellation system of claim 19, wherein said sound propagating medium is liquid.

22. The noise cancellation system of claim 18, further comprising a headset with ear coupling means of cup-like configuration for enclosing and isolating each ear of the patient from the ambient environment, said first and second areas respectively located within said ear coupling means.

23. The noise cancellation system of claim 22, wherein said headset with ear coupling means is of an open-backed coupling configuration.

24. The noise cancellation system of claim 18, wherein said sound propagating means is adapted to be mounted on the patient diagnosis apparatus and positioned near each ear of the patient within said first and second areas, respectively.