Wearable Device for Continuous Cardiac Monitoring

• US 20130338460A1
• Filed: 03/14/2013
• Published: 12/19/2013
• Est. Priority Date: 06/18/2012
• Status: Abandoned Application

• Current Assignee: Robert F. Dudley
• Original Assignee: Robert F. Dudley
• Inventors: He, David Da, Sodini, Charles G., Winokur, Eric Steven
• Application Number:
  US13/803,165
• Publication Number:
  US 20130338460A1
• Time in Patent Office: Days
• US Class Current: 600/324
• CPC Class Codes: A61B 2562/0219 Inertial sensors, e.g. accelerometers, gyroscopes, tilt switches
• CPC Class Codes: A61B 5/0004 characterised by the type of physiological signal transmitted
• CPC Class Codes: A61B 5/0006 ECG or EEG signals
• CPC Class Codes: A61B 5/0022 Monitoring a patient using a global network, e.g. telephone networks, internet
• 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 5/02125 of pulse wave propagation time
• CPC Class Codes: A61B 5/024 Detecting, measuring or recording pulse rate or heart rate A61B5/0205, A61B5/021 take precedence
• CPC Class Codes: A61B 5/0261 using optical means, e.g. infrared light
• CPC Class Codes: A61B 5/029 Measuring or recording blood output from the heart, e.g. minute volume A61B8/065 takes precedence
• CPC Class Codes: A61B 5/08 Detecting, measuring or recording devices for evaluating the respiratory organs A61B5/0205 takes precedence
• CPC Class Codes: A61B 5/11 Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb for measuring pulse A61B5/02 ;A61B5/1038 takes precedence; motion detection to correct for motion artifacts in physiological signals A61B5/721
• CPC Class Codes: A61B 5/1102 Ballistocardiography
• CPC Class Codes: A61B 5/1455 using optical sensors, e.g. spectral photometrical oximeters
• CPC Class Codes: A61B 5/14551 for measuring blood gases
• CPC Class Codes: A61B 5/30 Input circuits therefor
• CPC Class Codes: A61B 5/316 Modalities, i.e. specific diagnostic methods
• CPC Class Codes: A61B 5/318 Heart-related electrical modalities, e.g. electrocardiography [ECG]
• CPC Class Codes: A61B 5/486 Bio-feedback A61B5/375 takes precedence
• CPC Class Codes: A61B 5/6823 Trunk, e.g., chest, back, abdomen, hip
• CPC Class Codes: A61B 5/6824 Arm or wrist
• CPC Class Codes: A61B 5/6829 : Foot or ankle

Abstract

A physiological monitor for measuring a pulsatile motion signal (MoCG) that is delayed from, but at the same rate as, the heartbeat of a user. In one embodiment, the system includes a housing configured to be worn on the body of a user; at least one MoCG sensor, within the housing, that measures a pulsatile motion signal (MoCG) that is delayed from, but at the same rate as, the heartbeat of the user; and at least one data processor that calculates, solely based on an output of the at least one MoCG sensor, at least one of (i) heart rate (HR) and activity level for the user, and (ii) respiratory rate (RR), stroke volume (SV), and cardiac output (CO) for the user. In another embodiment, the at least one data processor is within the housing.

Claims

1. A system comprising:

a housing configured to be worn on a body of a user;

at least one MoCG sensor, within the housing, that measures a pulsatile motion signal (MoCG) that is delayed from, but at the same rate as, the heartbeat of the user; and

at least one data processor that calculates, solely based on an output of the at least one MoCG sensor, at least one of (i) heart rate (HR) and activity level for the user, and (ii) respiratory rate (RR), stroke volume (SV), and cardiac output (CO) for the user.

2. The system of claim 1, wherein the at least one data processor is within the housing.

3. The system of claim 1 further comprising:

at least one data transmitter coupled to the at least one MoCG sensor, and wherein the at least one data processor is part of a remote computing system that receives data from the at least one data transmitter.

4. The system of claim 3, wherein the remote computing system is selected from a group consisting of:

mobile communications devices, wearable devices, mobile telephones, tablet computers, data collection devices, and network enabled medical devices.

5. The system of claim 1, wherein the housing is worn on an extremity of the user.

6. The system of claim 1, wherein the housing is worn on or adjacent a bicep of the user.

7. The system of claim 1, wherein the housing is on or adjacent a wrist of the user.

8. The system of claim 1, wherein the housing is on or adjacent the torso of the user.

9. The system of claim 1, wherein the housing is on or adjacent a foot of the user.

10. The system of claim 1, wherein the housing is carried by the body of the user.

11. The system of claim 1, wherein the MoCG sensor comprises one or more of an accelerometer and a gyroscope.

12. The system of claim 1 further comprising at least one optical sensor, within the housing, for measuring photoplethysmogram (PPG) of the user.

13. The system of claim 12, wherein at least one data processor calculates blood pressure (BP) based on a calculated time delay between a reference point in the MoCG and a reference point in the PPG.

14. The system of claim 13, wherein the reference point is selected from a group consisting of:

a maxima, a minima, a point of maximum slope, or the midpoint of the maxima and minima of the MoCG and the PPG signals.

15. The system of claim 13, wherein the at least one data processor calculates at least one of (i) HR and RR for the user, and (ii) blood oxygenation (SpO2) for the user, solely using the measured PPG.

16. The system of claim 1 further comprising, within the housing, at least one circuit for measuring an electrocardiogram (ECG) of the user.

17. The system of claim 16, wherein the at least one data processor calculates pre-ejection period (PEP) in response to the delay between a peak in the ECG and a peak in the MoCG.

18. The system of claim 16, wherein the at least one data processor calculates HR and RR from ECG.

19. The system of claim 16 further comprising at least one optical sensor for measuring a PPG, and wherein at least one data processor calculates at least three of:

HR, BP, RR, SV, CO, activity level, SpO2, and PEP for the user based on the measured ECG and the measured PPG for the user.

20. The system of claim 1 further comprising, within the housing, memory for storing data and a transmitter that transmits data to at least one remote computing device.

21. The system of claim 1 further comprising a module for providing sensory feedback to the user upon the occurrence of at least one calculated event.

22. The system of claim 1 further comprising a module for providing sensory feedback to the user upon user request.

23. A system comprising:

a housing configured to be worn on a body of a user;

at least one MoCG sensor, within the housing, that measures a pulsatile motion signal (MoCG) that is delayed from, but at the same rate as, the heartbeat of the user; and

at least one optical sensor, within the housing, for measuring photoplethysmogram (PPG) of the user.

24. A system as in claim 23, further comprising at least one data processor.

25. The system of claim 24, wherein the at least one data processor calculates, solely based on an output of the at least one MoCG sensor, at least one of (i) heart rate (HR) and activity level for the user and (ii) respiratory rate (RR), stroke volume (SV), and cardiac output (CO) for the user.

26. The system of claim 24, wherein the at least one data processor is within the housing.

27. The system of claim 24 further comprising:

at least one data transmitter coupled to the at least one MoCG sensor and the at least one optical sensor, and wherein at least one data processor is part of a remote computing system that receives data from at least one data transceiver.

28. The system of claim 27, wherein the remote computing system is selected from a group consisting of:

mobile communications devices, wearable devices, mobile telephones, tablet computers, data collection devices, and network enabled medical devices.

29. The system of claim 23, wherein the housing is worn on an extremity of the user.

30. The system of claim 23, wherein the housing is worn on or adjacent a bicep of the user.

31. The system of claim 23, wherein the housing is on or adjacent a wrist of the user.

32. The system of claim 23, wherein the housing is on or adjacent the torso of the user.

33. The system of claim 23, wherein the housing is on or adjacent a foot of the user.

34. The system of claim 23, wherein the housing is carried by the body of the user.

35. The system of claim 23, wherein the MoCG sensor comprises one or more of an accelerometer and a gyroscope.

36. The system of claim 24, wherein the at least one data processor calculates blood pressure (BP) based on a calculated time delay between a reference point in the MoCG and a reference point in the PPG.

37. The system of claim 36, wherein the reference point is selected from a group consisting of:

a maxima, a minima, a point of maximum slope, or the midpoint of the maxima and minima of the MoCG and the PPG signals.

38. The system of claim 24, wherein the at least one data processor calculates at least one of (i) HR, RR for the user, and (ii) blood oxygenation (SpO2) for the user solely using the measured PPG.

39. The system of claim 23 further comprising, within the housing, at least one circuit for measuring an electrocardiogram (ECG) of the user.

40. The system of claim 39, wherein the at least one data processor calculates pre-ejection period (PEP) in response to the delay between a peak in the ECG and a peak in the MoCG.

41. The system of claim 39, wherein the at least one data processor calculates HR and RR from ECG.

42. The system of claim 23 further comprising, within the housing, memory for storing data and a transceiver that transmits data to at least one remote computing device.

43. The system of claim 23 further comprising a module for providing sensory feedback to the user upon the occurrence of at least one calculated event.

44. The system of claim 23 further comprising a module for providing sensory feedback to the user upon user request.

45. A method comprising:

receiving data from a first sensor characterizing pulsatile motion in the body (MoCG) of a user, the first sensor being part of a monitor worn on a body of the user;

calculating, solely based on the received data, heartbeat related parameters for the user comprising at least one of (i) heart rate (HR) and activity level for the user, and (ii) respiratory rate (RR), stroke volume (SV), and cardiac output (CO) for the user; and

providing data characterizing the heartbeat related parameters.

46. The method as in claim 45, wherein providing data comprises one or more of:

displaying at least a portion of the data characterizing the heartbeat related parameters, transmitting at least a portion of the data characterizing the heartbeat related parameters to a remote computing device, loading at least a portion of the data characterizing the heartbeat related parameters into memory, and storing at least a portion of the data characterizing the heartbeat related parameters into a data storage device.

47. The method of claim 45 further comprising:

receiving data from at least one optical sensor for measuring photoplethysmogram (PPG) of the user, the at least one optical sensor being part of the monitor worn on the body of the user; and

calculating blood pressure (BP) based on a calculated time delay between a reference point in the MoCG and a reference point in the PPG; and

providing data characterizing the calculated blood pressure.

48. The method of claim 47 further comprising calculating at least one of (i) HR and RR for the user and (ii) blood oxygenation (SpO2) for the user, solely using the measured PPG.

49. The method of claim 47 further comprising:

receiving data from at least one electrocardiogram (ECG) sensor for measuring ECG of the user, the at least one ECG sensor being part of the monitor worn on the body of the user; and

calculating at least three of;

HR, RR, SV, CO, activity level, SpO2, and PEP for the user in response to the MoCG, ECG and the PPG.

50. A non-transitory computer program product storing instructions, which when executed by at least one data processor of at least one computing system, results in operations comprising:

receiving data from a first sensor characterizing pulsatile motion in the body (MoCG) of a user, the first sensor being part of a monitor worn on a body of the user;

calculating, solely based on the received data, heartbeat related parameters for the user comprising at least one of;

(i) heart rate (HR) and activity level for the user, and (ii) respiratory rate (RR), stroke volume (SV) and cardiac output (CO) for the user; and

providing data characterizing the heartbeat related parameters.

51. The computer program product as in claim 50, wherein the providing of data comprises one or more of:

displaying at least a portion of the data characterizing the heartbeat related parameters, transmitting at least a portion of the data characterizing the heartbeat related parameters to a remote computing device, loading at least a portion of the data characterizing the heartbeat related parameters into memory, and storing at least a portion of the data characterizing the heartbeat related parameters into a data storage device.

52. The computer program product of claim 50, wherein the operations further comprise:

receiving data from at least one optical sensor for measuring photoplethysmogram (PPG) of the user, the at least one optical sensor being part of the monitor worn on the body of the user;

calculating blood pressure (BP) based on a calculated time delay between a reference point in the MoCG and a reference point in the PPG; and

providing data characterizing the calculated blood pressure.

53. The computer program product of claim 52, wherein the operations further comprise:

calculating at least one of (i) HR and RR for the user, and (ii) blood oxygenation (SpO2) for the user solely using the measured PPG.

54. The computer program product of claim 52, wherein the operations further comprise:

receiving data from at least one electrocardiogram (ECG) sensor for measuring ECG of the user, the at least one ECG sensor being part of the monitor worn on the body of the user; and

calculating at least three of;

HR, RR, SV, CO, activity level, SpO2, and PEP for the user in response to the MoCG, ECG and the PPG.

58. The system of claim 52, wherein the operations further comprise:

calculating at least one of (i) HR and RR for the user, and (ii) blood oxygenation (SpO2) for the user solely using the measured PPG.

59. The system of claim 58, wherein the operations further comprise:

receiving data from at least one electrocardiogram (ECG) sensor for measuring ECG of the user, at least one ECG sensor being part of the monitor worn on the body of the user; and

calculating at least three of;

HR, RR, SV, CO, activity level, SpO2, and PEP for the user in response to the MoCG, ECG and the PPG.

55. A system comprising:

at least one data processor; and

memory storing instructions, which when executed by at least one data processor, result in operations comprising;

receiving data from a first sensor characterizing pulsatile motion in the body (MoCG) of a user, the first sensor being part of a monitor worn on a body of the user;

calculating, solely based on the received data, heartbeat related parameters for the user comprising at least one of (i) heart rate (HR) and activity level for the user, and (ii) respiratory rate (RR), stroke volume (SV), and cardiac output (CO) for the user; and

providing data characterizing the heartbeat related parameters.

56. The system of claim 55, wherein providing data comprises one or more of:

displaying at least a portion of the data characterizing the heartbeat related parameters, transmitting at least a portion of the data characterizing the heartbeat related parameters to a remote computing device, loading at least a portion of the data characterizing the heartbeat related parameters into memory, and storing at least a portion of the data characterizing the heartbeat related parameters into a data storage device.

57. The system of claim 55, wherein the operations further comprise:

receiving data from at least one optical sensor for measuring photoplethysmogram (PPG) of the user, at least one optical sensor being part of the monitor worn on the body of the user;

calculating blood pressure (BP) based on a calculated time delay between a reference point in the MoCG and a reference point in the PPG; and

providing data characterizing the calculated blood pressure.