Medical devices with proximity detection

• US 8,907,782 B2
• Filed: 09/06/2011
• Issued: 12/09/2014
• Est. Priority Date: 06/30/2010
• Status: Expired due to Fees

• Current Assignee: Welch Allyn Incorporated
• Original Assignee: Welch Allyn Incorporated
• Inventors: Baker, Steven D., Lathrop, Braxton L., Nagasubramanian, Soundharya
• Primary Examiner(s): Wu, Daniel
• Assistant Examiner(s): Haile, Benyam
• Application Number:
  US13/225,989
• Publication Number:
  US 20120003933A1
• Time in Patent Office: 1,190 Days
• Field of Search: 340/539.12, 342/450, 342/458, 455/41.3
• US Class Current: 340/539.12
• CPC Class Codes: A61B 5/0002 Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network A61B5/07 takes precedence; transmission systems for measured values G08C; transmission H04B; transmission of digital information H04L; wireless communication networks H04W
• 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 5/01 Measuring temperature of body parts ; Diagnostic temperature sensing, e.g. for malignant or inflamed tissue clinical contact thermometers G01K13/20
• CPC Class Codes: A61B 5/021 Measuring pressure in heart or blood vessels A61B5/0205 takes precedence
• CPC Class Codes: A61B 5/14542 for measuring blood gases A61B5/14551 takes precedence
• CPC Class Codes: G16H 10/60 for patient-specific data, e.g. for electronic patient records
• CPC Class Codes: G16H 40/40 for the management of medical equipment or devices, e.g. scheduling maintenance or upgrades
• CPC Class Codes: G16H 40/67 for remote operation
• CPC Class Codes: H04L 67/14 Session management for real-time applications in data packet communications networks H04L65/1066
• CPC Class Codes: H04Q 2209/43 using wireless personal area networks [WPAN], e.g. 802.15, 802.15.1, 802.15.4, Bluetooth or ZigBee
• CPC Class Codes: H04Q 9/00 Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
• CPC Class Codes: H04W 4/02 Services making use of location information
• CPC Class Codes: H04W 4/023 using mutual or relative location information between multiple location based services [LBS] targets or of distance thresholds
• CPC Class Codes: H04W 4/029 Location-based management or tracking services
• CPC Class Codes: H04W 4/80 Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
• CPC Class Codes: H04W 74/02 Hybrid access
• CPC Class Codes: H04W 74/06 using polling
• CPC Class Codes: H04W 76/10 Connection setup
• CPC Class Codes: H04W 76/14 Direct-mode setup
• CPC Class Codes: H04W 76/18 : Management of setup rejection or failure
• CPC Class Codes: H04W 76/30 : Connection release
• CPC Class Codes: H04W 76/38 : triggered by timers

Abstract

A wireless medical device is disclosed. The wireless medical device comprises a processor, a memory, a sensor for detecting a physiological signal, a radio and a proximity detector to measure a distance of the wireless medical device relative to a second wireless medical device. The proximity detector includes a ranging functionality. A wireless communication channel is created when a distance between the wireless medical device and the second wireless medical device is within a first predetermined threshold. The distance is greater than zero.

Claims

1. A wireless medical device, the wireless medical device comprising:

a processor;

a memory that stores a patient context, the patient context providing an identifier for the patient;

a radio comprising an ultra-wideband (UWB) transceiver that determines a distance between the wireless medical device and a second wireless medical device, the radio using the distance as part of an authentication process;

wherein the wireless medical device is configured to join a personal area network with the second wireless medical device when the distance between the wireless medical device and the second wireless medical device is within a predetermined threshold, the distance being greater than zero, wherein the wireless medical device is configured to obtain the patient context from the second wireless medical device, the patient context being obtained from the second wireless medical device when the distance between the wireless medical device and the second wireless medical device is within the predetermined threshold for at least a predetermined interval of time, wherein the wireless medical device is configured to transfer physiological data to the second wireless medical device, the physiological data being transferred along with the patient context, and

wherein the wireless medical device is configured to support a spot check mode and a continuous workflow mode, wherein when a second distance determined by the radio between the wireless medical device and the second wireless monitor device is greater than a second predetermined threshold for at least a second predetermined interval of time, the patient context data is removed from the wireless medical device if the wireless medical device is operating in a spot check mode and the patient context data remains stored on the wireless medical device if the wireless medical device is operating in a continuous workflow mode.

2. The wireless medical device of claim 1, wherein the patient context is obtained from the second wireless medical device upon the detection of physiological signals by the wireless medical device while within the first predetermined threshold.

3. The wireless medical device of claim 1, wherein the second wireless medical device is a patient monitor device.

4. The wireless medical device of claim 1, wherein the patient context is removed from the wireless medical device based on conditions determined by a clinical workflow definition for the wireless medical device.

5. The wireless medical device of claim 1, wherein the patient context is further removed from the wireless medical device when a time since a physiological measurement has been made at the wireless medical device is greater than another predetermined time interval.

6. The wireless medical device of claim 1, wherein the patient context is a medical device identifier.

7. The wireless medical device of claim 1, wherein the wireless medical device is powered on when the distance between the wireless medical device and the second wireless medical device is within a pre-determined threshold.

8. The wireless medical device of claim 1, wherein the wireless medical device creates or breaks a connection based on conditions determined by a clinical workflow definition for the wireless medical device.

9. The wireless medical device of claim 1, wherein a ranging functionality is used to respond to queries.

10. The wireless medical device of claim 1, wherein the wireless medical device changes state based upon a detection of motion of the wireless medical device.

11. A method for authenticating a connection between two wireless medical devices, the method comprising:

moving a first wireless medical device to a proximity of a second wireless medical device;

using a first proximity detector on the first wireless medical device to determine a first distance between the first wireless medical device and the second wireless medical device;

joining the first and second wireless medical devices to a personal area network when the first distance between the first wireless medical device and the second wireless medical device is within a first predetermined threshold, the first distance being greater than zero;

obtaining a patient context at the first wireless medical device from the second wireless medical device when the first distance between the first wireless medical device and the second wireless medical device is within the first predetermined threshold for at least a first predetermined interval of time;

transferring physiological data to the second wireless medical device along with the patient context;

using the first proximity detector to determine a second distance;

determining that the second distance is greater than a second predetermined threshold for at least a second predetermined period of time;

removing the patient context data from the first wireless medical device if the first wireless medical device is operating in a spot check mode; and

maintaining the patient context data stored in the first wireless medical device if the first wireless medical device is operating in a continuous workflow mode.

12. The method of claim 11, wherein the first distance between the first wireless medical device and the second wireless medical device is obtained using an ultra-wideband ranging capability of the first wireless medical device and the second wireless medical device.

13. A system for transmitting physiological data from a first wireless medical device, the system comprising the first wireless medical device and a patient monitor device, the first wireless medical device comprising:

a first processor;

a first memory that stores a patient context, the patient context providing an identifier for the patient; and

a first radio, the first radio comprising a first ultra-wideband (UWB) transceiver that determines a first distance between the first wireless medical device and the patient monitor device, the first radio using the first distance as part of an authentication process,

the patient monitor device comprising;

a second processor;

a second memory that stores the patient context; and

a second radio, the second radio comprising a second UWB transceiver,

wherein the first wireless medical device joins a personal area network with the patient monitor device when the first distance between the first wireless medical device and the patient monitor device is within a first predetermined threshold, the first distance being greater than zero, wherein the first wireless medical device obtains the patient context from the patient monitor device, the patient context being obtained from the patient monitor device when the first distance between the first wireless medical device and the patient monitor device is within the first predetermined threshold for at least a first predetermined interval of time, wherein the first wireless medical device transfers physiological data to the patient monitor device, the physiological data being transferred along with the patient context, and

wherein the first wireless medical device supports a spot check mode and a continuous workflow mode, wherein when a second distance determined by the first radio between the first wireless medical device and the patient monitor device is greater than a second predetermined threshold for at least a second predetermined interval of time, the patient context data is removed from the first wireless medical device if the first wireless medical device is operating in a spot check mode and the patient context data remains stored on the first wireless medical device if the first wireless medical device is operating in a continuous workflow mode.

14. The system of claim 13, wherein the patient monitor device presents a confirmation request prior to storing the patient context when the range to multiple patient monitor devices is within a pre-determined threshold.