Wireless communication protocol for a medical sensor system

• US 20070109117A1
• Filed: 06/07/2006
• Published: 05/17/2007
• Est. Priority Date: 11/14/2005
• Status: Active Grant

• Current Assignee: Edwards Lifesciences Corporation
• Original Assignee: Edwards Lifesciences Corporation
• Inventors: Yadlowsky, Ann, Armstrong, John, Noda, Wayne, McKeown, Morgan, Sutton, George, Richert, John, Heitzmann, Harold, Gelvin, Michael, Frazier, John
• Granted Patent: US 7,595,723 B2
• Time in Patent Office: Days
• US Class Current: 340/539.120
• 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: H04L 67/125 involving control of end-device applications over a network

Abstract

In one embodiment the present invention provides a wireless communication system for medical sensor data. This communications system includes a portable unit that connects to a wireless sensor and a monitor unit that connects to a sensor monitor. Once activated, the units will self organize into a wireless communication structure controlled by the portable unit. As other pairs of units activate, they can self-organize their transmissions by joining an existing network or by creating new networks.

Claims

1. A method of organizing wireless communications comprising:

providing a portable unit connected to a medical sensor;

providing a monitor unit connected to a vital signs monitor;

transmitting a first wireless signal from said portable unit to said monitor unit;

controlling a second wireless signal transmitted from said monitor unit using said first wireless signal.

2. The method of claim 1, wherein said controlling a second wireless signal includes causing said second wireless signal to be transmitted according to a predetermined schedule.

3. The method of claim 2, wherein said causing said second wireless signal to be transmitted according to a predetermined schedule includes determining said predetermined schedule during operation of said portable unit and said monitor unit.

4. The method of claim 2, further comprising updating said predetermined schedule during operation of said portable unit and said monitor unit.

5. The method of claim 2, wherein said controlling a second wireless signal further includes causing said second wireless signal to be transmitted on a pre-selected communication timeslot.

6. The method of claim 1, wherein said controlling a second wireless signal includes causing said second wireless signal to be transmitted on a predetermined communication frequency and a predetermined timeslot within said communication frequency.

7. The method of claim 1, wherein said providing of a portable unit and said providing of a monitor unit includes providing said portable unit as a master unit and providing said monitor unit as a slave unit.

8. The method of claim 1, further comprising providing a plurality of portable units and transmitting a transmission schedule to said plurality of portable units for controlling said first wireless signals transmitted from said plurality of portable units.

9. The method of claim 1, further comprising coordinating wireless transmissions from a plurality of other portable units with said portable unit.

10. A wireless sensor system comprising;

a first slave unit connectable to a vital signs monitor for relating sensor data to said vital signs monitor, said first slave unit including a first wireless transceiver; and

a timing master unit connectable to a medical sensor, said timing master unit including a second wireless transceiver for controlling transmissions of at least said first slave unit.

11. The wireless sensor system of claim 10, wherein controlling transmission of at least said first slave unit includes communicating a transmission schedule to said first slave unit.

12. The wireless sensor system of claim 10, further comprising a plurality of portable units each connectable to a medical sensor and a plurality of slave units each connectable to a vital signs monitor;

the transmissions of said plurality of portable units and said plurality of slave units controlled by said first timing master unit.

13. The wireless sensor system of claim 12, wherein any one of said plurality of portable units can become said timing master unit.

14. The wireless sensor system of claim 10, wherein said timing master and said slave unit include a collision avoidance protocol for use on a common timeslot.

15. A wireless communication system comprising:

a monitor unit including a first wireless transceiver, said monitor unit connected to a vital signs monitor;

a portable unit connected to a sensor;

said portable unit including a processor for identifying a wireless transmission schedule and a second wireless transceiver for communicating said wireless transmission schedule to said monitor unit.

16. The wireless communication system of claim 15, wherein said processor in said portable unit includes a protocol to communicate said wireless transmission schedule to a plurality of portable units and a plurality of monitor units.

17. The wireless communication system of claim 15, wherein said transmission schedule includes a transmission frequency and a timeslot on which said monitor unit is to communicate.

18. The wireless communications system of claim 15, wherein said transmission schedule is transmitted on a predetermined timeslot.

19. The wireless communications system of claim 15, wherein said processor determines said transmission schedule when said portable unit is designated as a timing master.

20. The wireless communications system of claim 19, wherein designating of said portable unit as said timing master is based on a detection by said processor of at least one radio signal strength measurement.

21. A method of organizing wireless communications comprising:

providing a first portable unit connected to a medical sensor;

providing a first monitor unit connected to a vital signs monitor;

searching for a second portable unit controlling at least part of a wireless communications protocol;

controlling at least part of said wireless communications protocol with said first portable unit if said searching for said second portable unit is unsuccessful.

22. The method of claim 21, further comprising:

providing additional portable units; and

identifying which of said portable units to assume control of at least part of said wireless communications protocol in the event such assumption of control becomes necessary.

23. The method of claim 22, wherein identifying which of said portable units to assume control includes ranking said portable units based on a wireless signal strength.

24. The method of claim 21, wherein controlling at least part of said wireless communications protocol with said first portable unit if said searching for said second portable unit is unsuccessful includes designating a transmission schedule for at least said first portable unit.

25. The method of claim 24, wherein said controlling at least part of said wireless communication protocol includes designating a transmission schedule for a plurality of portable units.

26. The method of claim 21, wherein said searching for said second portable unit is unsuccessful when a wireless signal strength of said second portable unit is below a threshold value.

27. A method of organizing wireless communications comprising:

providing a first portable unit connectable to a medical sensor;

providing a first monitor unit connectable to a vital signs monitor;

activating said first portable unit and said first monitor unit;

scanning a plurality of frequencies with said first portable unit;

evaluating said plurality of frequencies based on a plurality of predetermined preferences;

selecting a transmission frequency based on said evaluating said plurality of frequencies;

communicating said transmission frequency to said first monitor unit;

causing transmission of information on said transmission frequency between said first portable unit and said first monitor unit.

28. The method of claim 27, wherein said evaluating of said plurality of frequencies based on a plurality of predetermined preferences includes evaluating a plurality of signal strengths on said frequencies.

29. The method of claim 28, wherein said evaluating of a plurality of signal strengths on said frequencies includes categorizing a plurality of wireless signals based on radio signal strength and ranking said plurality of frequencies.

30. The method of claim 27, wherein said evaluating of said plurality of frequencies based on a plurality of predetermined preferences includes increasing preference for a frequency of said plurality of frequencies based on radio signal strength.

31. The method of claim 27, wherein said evaluating said plurality of frequencies based on a plurality of predetermined preferences includes increasing preference for a frequency of said plurality of frequencies based on a number of portable units within a close proximity to said first portable unit.

32. A method of organizing wireless communications comprising:

providing a plurality of portable units, each portable unit being connectable to a medical sensor and including a wireless transceiver;

providing a plurality of monitor units being connectable to a vital signs monitor and including a wireless transceiver;

creating a line of succession based on characteristics of a wireless signal of each of said plurality of portable units; and

selecting a first portable unit from said plurality of portable units as a timing master based on said line of succession.

33. The method of claim 32, wherein said creating of a line of succession includes measuring a radio signal strength of said plurality of portable units on a frequency channel.

34. The method of claim 33, further comprising:

causing said first portable unit to become unavailable; and

selecting a second portable unit from said plurality of portable units based on said line of succession.

35. The method of claim 32, wherein said creating a line of succession based on characteristics of a wireless signal of each of said plurality of portable units includes storing said line of succession in a current timing master.

36. The method of claim 32, further comprising transmitting said line of succession to said plurality of portable units.

37. A method of organizing wireless communications comprising:

providing a first portable unit connectable to a medical sensor and having a first wireless ID tag reader;

providing a first monitor unit connectable to a vital signs monitor and having a second wireless ID tag reader;

moving a first ID tag near either one of said first portable unit and said first monitor unit to transmit an association code contained within said ID tag;

moving said first ID tag near the other of said first portable unit and said first monitor unit to transmit said association code contained within said ID tag;

transmitting a wireless signal including said association code with a first wireless transceiver contained within said first portable unit;

receiving said wireless signal including said association code with a second wireless transceiver contained within said first monitor unit; and

creating a partnership between said first portable unit and said first monitor unit based on said second wireless transceiver sensing said association code.

38. The method of claim 37, wherein said creating a partnership between said first portable unit and said first monitor unit further comprises:

transmitting a first portable unit serial number to said first monitor unit and storing said portable unit serial number in a first monitor unit memory;

transmitting a first monitor unit serial number to said first portable unit and storing said monitor unit serial number in a first portable unit memory.

39. The method of claim 38, further comprising transmitting a sensor data packet including said first portable unit serial number from said first portable unit to said first monitor unit.

40. The method of claim 37, wherein said moving a first ID tag near one of said first portable unit and said first monitor unit to transmit an association code contained within said ID tag includes transmitting said association code by RFID.

41. A wireless sensor system comprising;

a first unit connectable to a vital signs monitor for relating sensor data to said vital signs monitor, said first unit including a first wireless transceiver and a first wireless RFID transceiver; and

a second unit connectable to a medical sensor, said second unit including a second wireless transceiver for transmitting a first data signal to said first unit and including a second RFID transceiver.

42. The wireless sensor system of claim 41, wherein said second wireless transceiver controls transmissions of at least said first unit.

43. The wireless sensor system of claim 41, further comprising an RFID tag readable by said first RFID transceiver and said second RFID transceiver.

44. The wireless sensor system of claim 41, wherein said first RFID transceiver and said second RFID transceiver transmit on a frequency selected from 125-134 kHz, 13.56 MHz, 902-928 MHz, and 2.4 GHz.