Wireless synchronized movement monitoring apparatus and system

• US 8,647,287 B2
• Filed: 02/28/2011
• Issued: 02/11/2014
• Est. Priority Date: 12/07/2008
• Status: Active Grant

• Current Assignee: Wearables IP Holdings LLC
• Original Assignee: APDM, Inc.
• Inventors: Greenberg, Andrew, Riobo Aboy, Pedro Mateo, McNames, James, Pearson, Sean, Gallino, Gavin, Brandon, Timothy
• Primary Examiner(s): Hindenburg, Max
• Assistant Examiner(s): DANEGA, RENEE A
• Application Number:
  US13/037,310
• Publication Number:
  US 20110214030A1
• Time in Patent Office: 1,079 Days
• Field of Search: 600/595, 702/141
• US Class Current: 600/595
• CPC Class Codes: A61B 2560/0475 Special features of memory means, e.g. removable memory cards
• 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 5/002 Monitoring the patient using a local or closed circuit, e.g. in a room or building A61B5/0017 takes precedence
• CPC Class Codes: A61B 5/0024 for multiple sensor units attached to the patient, e.g. using a body or personal area network
• CPC Class Codes: A61B 5/1101 Detecting tremor
• CPC Class Codes: A61B 5/112 Gait analysis
• CPC Class Codes: A61B 5/4082 Diagnosing or monitoring movement diseases, e.g. Parkinson, Huntington or Tourette
• CPC Class Codes: A61B 5/6831 Straps, bands or harnesses
• CPC Class Codes: A61B 5/7246 using correlation, e.g. template matching or determination of similarity
• CPC Class Codes: A61B 5/7257 using Fourier transforms
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04W 56/002 Mutual synchronization

Abstract

Disclosed embodiments include a movement monitoring apparatus comprising a wireless synchronization scheme. Depending on the particular embodiment such wireless synchronization scheme is a master synchronization scheme or a mesh synchronization scheme. Additionally, in a particular embodiment, the movement monitor further comprises a robust wireless data transfer data controller. The disclosure includes a description of the complete system, namely, the wireless synchronized movement monitors with robust data transfer capabilities, the docking station, the access point, and the computer-implemented analysis system.

Claims

1. A wearable movement monitoring apparatus comprising:

(a) a kinematics sensor module with a resolution of 14 bits or more comprising an accelerometer, a gyroscope, a magnetometer, or combinations thereof, and said kinematics sensor configured to acquire more than 20 samples per second; and

(b) a bidirectional wireless communication module configured to wirelessly synchronize the sampling time instances of said kinematics sensor module with the sampling time instances of at least a second wearable movement monitoring apparatus using a wireless synchronization scheme/protocol, said bidirectional wireless communication module including a chip antenna, a printed circuit board antenna, or a patch antenna.

2. The movement monitoring apparatus of claim 1, wherein said wireless synchronization scheme is a master synchronization scheme or a mesh synchronization scheme.

3. The movement monitoring apparatus of claim 2, further comprising a robust wireless data transfer data controller.

4. The movement monitoring apparatus of claim 3, wherein said mesh synchronization scheme includes a statistical model of a network time and of said movement monitor apparatus relative to said network time.

5. The wearable movement monitoring apparatus of claim 4, wherein said statistical model of the network time is a distributed statistical clock model.

6. The wearable movement monitoring apparatus of claim 5, wherein said mesh synchronization scheme is based on a flooding time synchronization protocol.

7. The wearable movement monitoring apparatus of claim 6, wherein said flooding time synchronization scheme is modified to enable said movement monitoring apparatus to broadcast its estimated clock model parameters and enable a root node to estimate its own parameters.

8. The wearable movement monitoring apparatus of claim 3, wherein said robust wireless data transfer data controller stores data packets locally whenever a transmission error is detected, and re-transmits said data packets at a later point in time, whereby no data packets are lost during wireless data transfers.

9. The wearable movement monitoring apparatus of claim 2, wherein said mesh synchronization scheme 1) avoids a master time source, 2) configures each movement monitoring apparatus in a wireless network to send a synchronization packet during a prescribed time slot, 3) compares a local clock against one or more clocks of other movement monitors in said wireless network, and 4) creates a distributed statistical clock model of said network time and of said local clock relative to said network time.

10. The wearable movement monitoring apparatus of claim 1, wherein said bidirectional wireless communication module comprises a low power bidirectional transceiver configured for transmitting and receiving wireless communications.

11. The wearable movement monitoring apparatus of claim 1, wherein said kinematics sensor module comprises a low power three-axis low-noise accelerometer and a low power three-axis low-noise gyroscope.

12. The wearable movement monitoring apparatus of claim 1, wherein said kinematics sensor module further includes a temperature sensor.

13. The wearable movement monitoring apparatus of claim 1, further comprising a data storage module including an onboard solid state local storage medium configured for multi-day local storage of movement monitoring data at sampling frequencies greater than 20 samples per second.

14. The wearable movement monitoring apparatus of claim 3, wherein said robust data transfer controller is configured to send movement monitoring data to a low power radio and store said movement monitoring data locally whenever a failed transmission is detected.

15. The wearable movement monitoring apparatus of claim 14, wherein said robust data transfer controller is further configured to 1) store movement monitoring data to said onboard solid state local storage medium while sensing the state of a communication channel, 2) shut off said low power radio to save power while continuing to poll said communication channel, and 3) transmit said movement monitoring data when said communication channel becomes available.

16. The wearable movement monitoring apparatus of claim 3, wherein said robust data transfer controller is configurable for 1) optimizing power, 2) optimizing communication bandwidth, or 3) optimizing robustness to lost data packets.

17. The wearable movement monitoring apparatus of claim 11, wherein said kinematics sensor module further comprises a low power three-axis low-noise magnetometer.

18. The wearable movement monitoring apparatus of claim 1, wherein said movement monitoring apparatus is a lightweight device further comprising a power module including a Lithium Ion Polymer battery.