Critical care thermal therapy method and system

• US 7,909,861 B2
• Filed: 10/13/2006
• Issued: 03/22/2011
• Est. Priority Date: 10/14/2005
• Status: Active Grant

• Current Assignee: The Thermotek Incorporated
• Original Assignee: The Thermotek Incorporated
• Inventors: Hadzidedic, Darko, Balachandran, Niran, Quisenberry, Tony, Parish, Overton L.
• Primary Examiner(s): Gibson; Roy D
• Assistant Examiner(s): SMITH, KAITLYN ELIZABETH
• Application Number:
  US11/580,504
• Publication Number:
  US 20070112401A1
• Time in Patent Office: 1,621 Days
• Field of Search: 607/104
• US Class Current: 607/104
• CPC Class Codes: A61B 2017/00119 alarm; indicating an abnormal situation
• CPC Class Codes: A61F 2007/0001 Body part
• CPC Class Codes: A61F 2007/0054 with a closed fluid circuit, e.g. hot water
• CPC Class Codes: A61F 2007/0075 using a Peltier element, e.g. near the spot to be heated or cooled
• CPC Class Codes: A61F 2007/0076 remote from the spot to be heated or cooled
• CPC Class Codes: A61F 2007/0086 with a thermostat
• CPC Class Codes: A61F 7/02 Compresses or poultices for effecting heating or cooling

Abstract

A critical care thermal therapy system incorporating a remote temperature sensor in association with a thermal module adapted for delivering a fluid to a patient in response to the sensed temperature thereof.

Claims

1. A critical care, thermal therapy system utilizing a thermal fluid flow to which a patient is thermally exposed, the system comprising:

a recirculating, temperature controlled fluid flow network adapted for patient care;

a temperature control module connectable in fluid communication with the temperature controlled fluid flow network for regulating the thermal fluid temperature and flow to the patient;

a thermal therapy device adapted for the flow of the thermal fluid therethrough and thermal exposure to the patient, the device being connectable to the temperature control module through the temperature controlled fluid flow network; and

at least one temperature sensor in thermal communication with the patient and remotely disposed from the temperature control module;

wherein the at least one remotely disposed temperature sensor monitors a select body temperature and sends thermal measurement signals to the temperature control module;

wherein, the temperature control module calculates a rate factor and an acceleration factor of the select body temperature; and

wherein, responsive to the rate factor and the acceleration factor of the select body temperature, the temperature control module is adapted to increase or decrease the thermal fluid temperature or flow rate in response to the thermal measurement signals from the at least one remotely disposed temperature sensor.

2. The system of claim 1 wherein the thermal measurement signals sent by the at least one remotely disposed temperature sensor comprise real-time measurements.

3. The system of claim 1 and further comprising:

a user interface coupled to the temperature control module for setting a desired temperature and tolerance boundaries;

wherein the tolerance boundaries represent upper and lower thermal fluid temperature limits.

4. The system of claim 3 wherein the user interface is electrically isolated from the temperature control module, by way of an infrared connection.

5. The system of claim 3 wherein the temperature control module continually adjusts the thermal fluid temperature wherein the monitored temperature approaches the desired temperature.

6. The system of claim 3 wherein the user interface comprises an alarm for alerting the user when an error occurs.

7. The system of claim 1 wherein the temperature control module is capable of receiving power from an AC power source.

8. The system of claim 1 wherein the temperature control module is capable of receiving power from a DC power source.

9. The system of claim 1 wherein the temperature controlled fluid flow network is portable.

10. The system of claim 1 wherein the temperature control module is rack mountable.

11. The system of claim 1 wherein the at least one remotely disposed temperature sensor is electrically isolated from the temperature control module, by way of an infrared connection.

12. The system of claim 1 wherein the at least one remotely disposed temperature sensor and the temperature control module are communicatively coupled via infrared signals.

13. The system of claim 1 wherein the temperature control module comprises a thermoelectric component for regulating the thermal fluid temperature.

14. The system of claim 13 wherein the thermoelectric component for regulating the temperature of the thermal fluid is secured therein for low-noise and low-vibrational operation facilitating use in a neonatal critical care environment.

15. The system of claim 1 wherein the at least one remotely disposed temperature sensor monitors one or more of a rectal temperature, an esophageal temperature, a dermal temperature, and a deep-brain temperature.

16. The system of claim 1 wherein the thermal therapy device comprises one or more of a thermal wrap, a thermal blanket, and a thermal pad.

17. The system of claim 1 and further comprising an alarm for indicating the occurrence of an error.

18. A method of thermal therapy critical care utilizing a thermal fluid flow to which a patient is thermally exposed, the method comprising:

recirculating a thermal fluid through a closed-loop fluid flow network adapted for patient care;

controlling the flow of the thermal fluid with a temperature control module connectable to the fluid flow network;

thermally exposing an environment to the thermal fluid via a thermal therapy device connectable to the fluid flow network;

monitoring a patient temperature with at least one temperature sensor remotely disposed from the temperature control module; and

sending real-time signals from the at least one remotely disposed temperature sensor to the temperature control module indicating the patient temperature, wherein the temperature control module calculates a rate factor and an acceleration factor of the patient temperature; and

adjusting a temperature of the thermal fluid responsive to the rate factor and the acceleration factor of the patient temperature via the temperature control module.

19. The method of claim 18 wherein the at least one remotely disposed temperature sensor is electrically isolated from a main power supply of the temperature control module, by way of an infrared connection.

20. The method of claim 18 and further comprising:

inputting a desired temperature into a user interface coupled to the temperature control module.

21. The method of claim 20 and further comprising:

inputting upper and lower tolerance boundaries into the user interface; and

wherein the upper tolerance boundary represents a maximum allowed temperature for the thermal fluid and the lower tolerance boundary represents a minimum allowed temperature for the thermal fluid.

22. The method of claim 20 and further comprising:

decreasing the flow rate of the thermal fluid when the patient temperature substantially equals the desired temperature.

23. The method of claim 18 wherein a main power supply of the temperature control module is adapted to receive an AC input.

24. The method of claim 18 wherein a main power supply of the temperature control module is adapted to receive a DC input.

25. The method of claim 18 wherein the at least one remotely disposed temperature sensor and the temperature control module are communicatively coupled via infrared signals.

26. The method of claim 18 wherein the temperature control module utilizes a thermoelectric component to heat and cool the thermal fluid.

27. The method of claim 18 wherein the at least one remotely disposed temperature sensor is one of a rectal thermometer, an esophageal thermometer, a dermal thermometer, and a deep-brain temperature monitor.

28. The method of claim 18 wherein the thermal therapy device is one of a thermal wrap, a thermal blanket, and a thermal pad.

29. The method of claim 18 and further comprising:

sounding an alarm if any error occurs.

30. A critical care, thermal therapy system utilizing a thermal fluid flow to which a patient is thermally exposed, the system comprising:

a recirculating, temperature controlled fluid flow network adapted for patient care;

a temperature control module connectable in fluid communication with the temperature controlled fluid flow network for regulating the thermal fluid temperature and flow to the patient;

a thermal therapy device adapted for the flow of the thermal fluid therethrough and thermal exposure of the patient, the device being connectable to the temperature control module through the temperature controlled fluid flow network; and

a temperature sensor in thermal communication with the patient and remotely disposed from the temperature control module;

wherein the temperature sensor monitors a select body temperature and sends thermal measurement signals to the temperature control module; and

wherein the temperature control module utilizes a rate factor and an acceleration factor of the monitored temperature as well as a moving average of the monitored temperature to control the thermal fluid temperature or flow rate.

31. The thermal therapy system of claim 30 wherein the temperature control module waits for transient events to pass before making adjustments to the temperature of the thermal fluid.

32. The thermal therapy system of claim 31 wherein the temperature control module utilizes the acceleration factor of the monitored temperatures to calculate the rate of temperature change to detect transient events.

33. The thermal therapy system of claim 32 wherein the transient events comprise spikes in the monitored temperature due to one or more of movement of the patient, insertion of an I.V. into the patient, acid reflux in the patient, and a variation in a metabolic condition of the patient.

34. The thermal therapy system of claim 30 wherein a core body temperature of the patient can be changed with an overshoot of less than 0.5 degrees Celsius and maintained within 0.2 degrees Celsius of a set temperature.

35. The thermal therapy system of claim 30

wherein the temperature control module operates in four states comprising:

a stable state when the monitored temperature is within 0.25 degrees Celsius of an ideal temperature;

a slow state when the monitored temperature is between 0.25 and 1.00 degrees Celsius of the ideal temperature;

a medium state when the monitored temperature is between 1.00 and 2.00 degrees Celsius of the ideal temperature; and

a fast state when the monitored temperature is more than 2.00 degrees Celsius away from the ideal temperature.