Disposable, multi-purpose cardiovascular autonomic neuropathy testing device

• US 7,912,536 B2
• Filed: 09/06/2006
• Issued: 03/22/2011
• Est. Priority Date: 09/06/2005
• Status: Expired due to Fees

• Current Assignee: Neurometrix, Inc.
• Original Assignee: Neurometrix, Inc.
• Inventors: Fendrock, Charles
• Primary Examiner(s): Getzow; Scott M
• Assistant Examiner(s): Dietrich; Joseph M
• Application Number:
  US11/516,282
• Publication Number:
  US 20070066909A1
• Time in Patent Office: 1,658 Days
• Field of Search: 600/509, 600/513, 600/529, 600/532, 600/537, 600/538, 600/484
• US Class Current: 600/513
• CPC Class Codes: A61B 5/0205 Simultaneously evaluating both cardiovascular conditions and different types of body conditions, e.g. heart and respiratory condition
• CPC Class Codes: A61B 5/02405 Determining heart rate variability
• CPC Class Codes: A61B 5/0245 by using sensing means generating electric signals, i.e. ECG signals
• CPC Class Codes: A61B 5/038 Measuring oral pressure
• CPC Class Codes: A61B 5/087 Measuring breath flow
• CPC Class Codes: A61B 5/0878 using temperature sensing means
• CPC Class Codes: A61B 5/25 Bioelectric electrodes therefor
• CPC Class Codes: A61B 5/28 for electrocardiography [ECG]
• CPC Class Codes: A61B 5/332 Portable devices specially adapted therefor
• CPC Class Codes: A61B 5/4035 Evaluating the autonomic nervous system

Abstract

A disposable, multi-purpose cardiovascular autonomic neuropathy testing device which comprises a tubular body having a distal end, a proximal end and a passageway extending therebetween; at least one ECG electrode disposed on the exterior surface of the tubular body for monitoring ECG signals of a patient holding the tubular body; a breathing sensor attached to the tubular body for monitoring breathing through the passageway; a closure mechanism attached to the tubular body for selectively restricting the passageway; and a pressure monitor attached to the tubular body for confirming when a pre-determined pressure has been established in the passageway; whereby the testing device can be used to conduct (i) metronomic breathing tests, (ii) Valsalva maneuver tests, and (iii) HRV standing tests.

Claims

1. A disposable, multi-purpose cardiovascular autonomic neuropathy testing device which comprises:

a tubular body having a distal end, a proximal end, and a single passageway defined thereby and extending therethrough;

at least one ECG electrode disposed on an exterior surface of said tubular body for sensing ECG signals of a patient holding said tubular body;

a breathing sensor attached to an interior surface of said tubular body for measuring air flow caused by breathing through the passageway;

a closure mechanism attached to the distal end of said tubular body for selectively restricting the passageway, said closure mechanism having a first configuration in which the passageway is unrestricted, and a second configuration in which the passageway is selectively restricted; and

a pressure monitor attached to the interior surface of said tubular body for confirming when a pre-determined pressure has been established in the passageway;

whereby when said closure mechanism is in the first configuration such that the passageway is unrestricted, the testing device is adapted for conducting metronomic breathing tests wherein the patient breathes through the passageway while the patient'"'"'s ECG is monitored by said at least one ECG electrode, and

the testing device is further adapted for conducting HRV standing tests wherein the patient'"'"'s ECG is monitored by the ECG electrode;

whereby when the closure mechanism is in the second configuration such that the passageway is restricted, the testing device is adapted to conduct Valsalva maneuver tests wherein the patient breathes into the passageway until said pressure monitor confirms that the pre-determined pressure has been established in the passageway while the patient'"'"'s ECG is monitored by said at least one ECG electrode.

2. A testing device according to claim 1 wherein said tubular body comprises a rolled-substrate.

3. A testing device according to claim 2 wherein said tubular body further comprises a molded mouthpiece.

4. A testing device according to claim 2 wherein said rolled substrate is formed of a plastic.

5. A testing device according to claim 4 wherein said rolled substrate is 0.002 inches to 0.007 inches thick.

6. A testing device according to claim 2 wherein said rolled substrate is sufficiently flexible to be rolled from a flat sheet configuration, but sufficiently rigid to provide body when said rolled substrate is in a rolled configuration.

7. A testing device according to claim 2 wherein the testing device further comprises a conductive pattern disposed on the rolled substrate so as to form (i) said at least one ECG electrode, and (ii) a plurality of electrical traces.

8. A testing device according to claim 1 wherein said tubular body comprises a molded element.

9. A testing device according to claim 8 wherein said molded element is provided with a substrate secured thereto.

10. A testing device according to claim 9 wherein the substrate is provided with a conductive pattern deposited on the substrate so as to form (i) said at least one ECG electrode, and (ii) a plurality of electrical traces.

11. A testing device according to claim 1 wherein a substrate is secured to said tubular body, and the substrate forms a conductive pattern on the substrate so as to form (i) said at least one ECG electrode, and (ii) a plurality of electrical traces.

12. A testing device according to claim 1 wherein a conductive pattern is disposed on said tubular body so as to form (i) said at least one ECG electrode, and (ii) a plurality of electrical traces.

13. A testing device according to claim 1 wherein said breathing sensor is disposed in an interior of said tubular body.

14. A testing device according to claim 1 wherein said breathing sensor comprises a mechanically-based flow sensor.

15. A testing device according to claim 14 wherein said mechanically-based flow sensor comprises a strain-type device.

16. A testing device according to claim 1 wherein said breathing sensor comprises a thermally-based sensor.

17. A testing device according to claim 16 wherein said thermally-based sensor comprises a thermistor.

18. A testing device according to claim 17 wherein said thermistor comprises a positive temperature coefficient thermistor.

19. A testing device according to claim 17 wherein said thermistor comprises a negative temperature coefficient thermistor.

20. A testing device according to claim 16 wherein said thermally-based sensor comprises a semiconductor-based temperature sensing element.

21. A testing device according to claim 1 wherein said closure mechanism comprises a flip-cap.

22. A testing device according to claim 1 wherein said closure mechanism comprises a shutter.

23. A testing device according to claim 1 wherein said tubular body is flexible, and further wherein said closure mechanism comprises adhesive on said tubular body, whereby said tubular body is collapsible and said adhesive is adapted to hold said tubular body in a collapsed condition.

24. A testing device according to claim 1 wherein said closure mechanism comprises a “

zip lock”

configuration.

25. A testing device according to claim 1 wherein said pressure monitor is disposed on an inner surface of said tubular body.

26. A testing device according to claim 1 wherein said pressure monitor comprises a valve.

27. A testing device according to claim 26 wherein said valve comprises a flap valve.

28. A testing device according to claim 27 wherein said flap valve in said tubular body is a punched or laser cut flap valve.

29. A testing device according to claim 27 wherein said flap valve comprises two conductive trace elements and a circuit therebetween such that (i) when said flap valve is closed, said circuit is open, and (ii) when said flap valve is open, said circuit is closed.

30. A testing device according to claim 1 wherein the pre-determined pressure is 40 mm HG.

31. A testing device according to claim 1 wherein said pressure monitor comprises a strain-sensitive printed resistive element.

32. A testing device according to claim 31 wherein said strain-sensitive printed resistive element is deformable.

33. A testing device according to claim 31 wherein said strain-sensitive printed resistive element (i) is in the first configuration when the pre-determined pressure is not established in the passageway, and (ii) is in the second configuration when the pre-determined pressure is established in the passageway.

34. A testing device according to claim 1 wherein said pressure monitor is formed as part of said tubular body.

35. A testing device according to claim 1 wherein said pressure monitor comprises a sound creation element.

36. A testing device according to claim 1 wherein the output of said pressure monitor is recordable.

37. A method for testing breathing effort of a person, the method comprising the steps of:

providing a testing device comprising a tubular body having a distal end and a proximal end, and a single passageway defined thereby and extending therethrough, an ECG electrode disposed on an exterior surface of the tubular body and engageable by fingers of the person, a breathing flow sensor disposed in the tubular body, a closure mechanism adapted for restricting and closing the passageway, and for rendering the passageway unrestricted, and a pressure monitor mounted within the tubular body for measuring pressure in the passageway;

setting the closure mechanism to provide a selected one of no restriction and a selected degree of restriction of the passageway;

placing fingertips of the person on the ECG electrode;

breathing by the person into the proximal end of the passageway;

measuring the person'"'"'s inspiration and expiration by the breathing flow sensor;

sensing the person'"'"'s ECG with the ECG electrode; and

performing at least one of (1) a metronomic breathing test, (2) a Valsalva maneuver, and (3) an HRV test.