CA2454607A1 - System and method for patient temperature control employing temperature projection algorithm - Google Patents

System and method for patient temperature control employing temperature projection algorithm Download PDF

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Publication number
CA2454607A1
CA2454607A1 CA002454607A CA2454607A CA2454607A1 CA 2454607 A1 CA2454607 A1 CA 2454607A1 CA 002454607 A CA002454607 A CA 002454607A CA 2454607 A CA2454607 A CA 2454607A CA 2454607 A1 CA2454607 A1 CA 2454607A1
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Canada
Prior art keywords
temperature
working fluid
time
interval
circulating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002454607A
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French (fr)
Other versions
CA2454607C (en
Inventor
Michael Magers
Steve Yon
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Zoll Circulation Inc
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Individual
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Filing date
Publication date
Priority claimed from US10/117,733 external-priority patent/US6702841B2/en
Priority claimed from US10/219,874 external-priority patent/US6974463B2/en
Application filed by Individual filed Critical Individual
Publication of CA2454607A1 publication Critical patent/CA2454607A1/en
Application granted granted Critical
Publication of CA2454607C publication Critical patent/CA2454607C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F7/00—Heating or cooling appliances for medical or therapeutic treatment of the human body
    • A61F7/12—Devices for heating or cooling internal body cavities
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F7/00—Heating or cooling appliances for medical or therapeutic treatment of the human body
    • A61F7/12—Devices for heating or cooling internal body cavities
    • A61F7/123—Devices for heating or cooling internal body cavities using a flexible balloon containing the thermal element
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F7/00—Heating or cooling appliances for medical or therapeutic treatment of the human body
    • A61F7/12—Devices for heating or cooling internal body cavities
    • A61F2007/126—Devices for heating or cooling internal body cavities for invasive application, e.g. for introducing into blood vessels

Abstract

Embodiments of the invention provide a system for temperature control of the human body. The system includes an indwelling catheter with a tip-mounted heat transfer element. The catheter is fluidically coupled to a console that provides a heated or cooled heat transfer working fluid to exchange heat with the heat transfer element, thereby heating or cooling blood. The heated or cooled blood then heats or cools the patient's body or a selected portion thereof. In particular, methods and devices, including software, are provided for administering cooling or rewarming and controlling the same based on a projected control temperature measured by a temperature sensor within the catheter.

Claims (42)

1. A method of controlling the administration of a thermal therapy, comprising:
inserting a catheter having a heat transfer element positioned at a distal tip of the catheter into a blood vessel of a patient, the catheter having a supply lumen for supplying a working fluid to the heat transfer element and a return lumen for returning a working fluid from the heat transfer element;
circulating a working fluid through the catheter and the heat transfer element, the working fluid having a temperature different from the patient temperature;
receiving a signal from a temperature sensor mounted in one of the supply lumen or the return lumen;
determining a control temperature based on the signal; and using the control temperature to control the temperature of the working fluid.
2. The method of claim 1, further comprising causing the working fluid to stop circulating, and wherein the receiving includes:
allowing a first interval of time to pass;
collecting data from the temperature sensor during a second interval of time, such that the allowing and collecting each follow the causing.
3. The method of claim 1, wherein the temperature sensor is selected from the group consisting of thermistors, thermocouples, and combinations thereof.
4. The method of claim 3, wherein the temperature sensor is two thermistors, and further comprising receiving a safety monitor signal from one of the two thermistors.
5. The method of claim 4, further comprising causing the working fluid to stop circulating if a value of control temperature measured by the safety monitor signal falls outside a predetermined range.
6. The method of claim 5, wherein the predetermined range is 31oC to 37oC.
7. The method of claim 2, wherein no data is collected during the first interval.
8. The method of claim 7, wherein data is collected during the second interval at a predetermined frequency.
9. The method of claim 2, wherein the first interval is between about 5 and 15 seconds.
10. The method of claim 9, wherein the first interval is between about 10 and 12 seconds.
11. The method of claim 2, wherein the second interval is between about 10 and 30 seconds.
12. The method of claim 11, wherein the second interval is between about 15 and 25 seconds.
13. The method of claim 1, wherein the temperature sensor is disposed in a polymer tube within the supply lumen or the return lumen.
14. The method of claim 1, wherein the temperature sensor is disposed in the return lumen.
15. The method of claim 13, wherein the polymer is polyamide.
16. The method of claim 2, wherein the first interval is about the same length of time as the second interval.
17. The method of claim 2, wherein the first and second intervals are different lengths of time.
18. The method of claim 2, further comprising integrating a value of the signal over the first interval with respect to time to derive a first area.
19. The method of claim 18, further comprising integrating a value of the signal over the second interval with respect to time to derive a second area.
20. The method of claim 2, wherein the second interval of time is at least one minute.
21. The method of claim 2, wherein the time during which the working fluid is caused to stop circulating, divided by the sum of the time during which the working fluid is caused to stop circulating plus the time during which the working fluid is circulating, is greater than about 90%.
22. The method of claim 1, further comprising circulating a working fluid, and not determining a control temperature, for a predetermined period of time based on the difference between a current patient temperature and a target patient temperature.
23. The method of claim 22, wherein the working fluid has a temperature below the current patient temperature, and wherein the predetermined period of time is greater than about 30 minutes.
24. The method of claim 22, wherein the working fluid has a temperature above the current patient temperature, and wherein the predetermined period of time is greater than about 15 minutes.
25. The method of claim 22, wherein the predetermined period of time is directly proportional to the difference between the current patient temperature and the target patient temperature.
26. The method of claim 22, wherein the circulating includes circulating the working fluid at a maximum pump speed.
27. The method of claim 22, wherein the circulating includes circulating the working fluid at a power of pump speed which is proportional to the difference between the current patient temperature and the target patient temperature.
28. The method of claim 22, wherein the predetermined period of time is determined by the initial patient temperature minus the sum of the target patient temperature and a constant, divided by the maximum rate of change of temperature, pertaining to a desired thermal therapy.
29. The method of claim 28, wherein the desired thermal therapy is inducing hypothermia.
30. The method of claim 28, wherein the desired thermal therapy is rewarming.
31. The method of claim 19, further comprising dividing the first area by the second area to calculate a value that is a function of a time constant of an exponential function.
32. The method of claim 31, further comprising constructing a look-up table for the function of the time constant and the results of the division of the first area by the second area.
33. The method of claim 32, further comprising determining a magnitude of the exponential function using the first area, the second area, and the time constant.
34. The method of claim 33, wherein the determining further comprises calculating the projected control temperature based on the signal from the temperature sensor as measured at the end of the second interval, the magnitude of the exponential function, and the time constant of the exponential function.
35. The method of claim 2, wherein the determining includes:
assuming a range of time constants for an exponential;
performing a least squares fit between the collected data and the exponential for each of the range of time constants to calculate an error value that is a function of the time constant; and minimizing the error value to determine a unique value of the time constant.
36. The method of claim 35, further comprising using the unique value of the time constant to determine the projected control temperature.
37. The method of claim 35, further comprising determining the magnitude of the exponential.
38. The method of claim 35, further comprising determining a first-order linear component and adding the first-order linear component to the exponential to determine the projected control temperature.
39. The method of claim 38, further comprising determining a higher-order components and adding the higher-order components to the exponential to determine the projected control temperature.
40. The method of claim 1, further comprising administering an anti-shivering agent to the patient.
41. A computer program, residing on a computer-readable medium, for causing a machine to:
receive a signal from a temperature sensor mounted in one of a supply lumen or a return lumen in which working fluid is flowing;
determine a control temperature based on the signal; and use the control temperature to control the temperature of the working fluid.
42. A computer program, residing on a computer-readable medium, for causing a machine to:
receive a signal from a temperature sensor mounted in one of a supply lumen or a return lumen in which a working fluid is flowing;
cause the working fluid to stop flowing;
allow a first interval of time to pass;
collect data from the temperature sensor during a second interval of time;
determine a control temperature based on the collected data; and use the control temperature to control the temperature of the working fluid.
CA2454607A 2001-08-15 2002-08-15 System and method for patient temperature control employing temperature projection algorithm Expired - Fee Related CA2454607C (en)

Applications Claiming Priority (19)

Application Number Priority Date Filing Date Title
US31240901P 2001-08-15 2001-08-15
US60/312,409 2001-08-15
US31605701P 2001-08-29 2001-08-29
US60/316,057 2001-08-29
US31692201P 2001-08-31 2001-08-31
US60/316,922 2001-08-31
US32294501P 2001-09-14 2001-09-14
US60/322,945 2001-09-14
US32832001P 2001-10-09 2001-10-09
US32825901P 2001-10-09 2001-10-09
US60/328,320 2001-10-09
US60/328,259 2001-10-09
US33678301P 2001-11-07 2001-11-07
US60/336,783 2001-11-07
US10/117,733 2002-04-04
US10/117,733 US6702841B2 (en) 1998-01-23 2002-04-04 Method of manufacturing a heat transfer element for in vivo cooling
US10/219,874 2002-08-14
US10/219,874 US6974463B2 (en) 1999-02-09 2002-08-14 System and method for patient temperature control employing temperature projection algorithm
PCT/US2002/025824 WO2003015673A1 (en) 2001-08-15 2002-08-15 System and method for patient temperature control employing temperature projection algorithm

Publications (2)

Publication Number Publication Date
CA2454607A1 true CA2454607A1 (en) 2003-02-27
CA2454607C CA2454607C (en) 2010-04-06

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CA2454607A Expired - Fee Related CA2454607C (en) 2001-08-15 2002-08-15 System and method for patient temperature control employing temperature projection algorithm

Country Status (5)

Country Link
EP (1) EP1416892A4 (en)
JP (1) JP2004538087A (en)
AU (1) AU2002326640B2 (en)
CA (1) CA2454607C (en)
WO (1) WO2003015673A1 (en)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6974463B2 (en) 1999-02-09 2005-12-13 Innercool Therapies, Inc. System and method for patient temperature control employing temperature projection algorithm
US7458984B2 (en) 1998-01-23 2008-12-02 Innercool Therapies, Inc. System and method for inducing hypothermia with active patient temperature control employing catheter-mounted temperature sensor and temperature projection algorithm
US7914564B2 (en) 1999-02-09 2011-03-29 Innercool Therapies, Inc. System and method for patient temperature control employing temperature projection algorithm
US8574146B2 (en) 2000-04-14 2013-11-05 Attenuex Technologies, Inc. Implant with high vapor pressure medium
US10327880B2 (en) 2000-04-14 2019-06-25 Attenuex Technologies, Inc. Attenuation device for use in an anatomical structure
US7374532B2 (en) 2000-04-14 2008-05-20 Attenuex Technologies, Inc. High vapor pressure attenuation device
US6682473B1 (en) 2000-04-14 2004-01-27 Solace Therapeutics, Inc. Devices and methods for attenuation of pressure waves in the body
US20070093697A1 (en) * 2005-10-21 2007-04-26 Theranova, Llc Method and apparatus for detection of right to left shunting in the cardiopulmonary vasculature
JP2007167127A (en) * 2005-12-19 2007-07-05 Atsuo Mori Catheter for topical cooling
US8100880B2 (en) 2007-04-05 2012-01-24 Velomedix, Inc. Automated therapy system and method
WO2009009540A1 (en) 2007-07-09 2009-01-15 Velomedix, Inc. Hypothermia devices and methods
US8608696B1 (en) 2009-02-24 2013-12-17 North Carolina State University Rapid fluid cooling devices and methods for cooling fluids
US9622670B2 (en) 2010-07-09 2017-04-18 Potrero Medical, Inc. Method and apparatus for pressure measurement
US8894563B2 (en) 2012-08-10 2014-11-25 Attenuex Technologies, Inc. Methods and systems for performing a medical procedure
CN113677256A (en) 2019-02-07 2021-11-19 索雷斯医疗公司 Pressure attenuation device

Family Cites Families (3)

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Publication number Priority date Publication date Assignee Title
US5837003A (en) * 1993-02-10 1998-11-17 Radiant Medical, Inc. Method and apparatus for controlling a patient's body temperature by in situ blood temperature modification
US6231594B1 (en) * 1999-08-11 2001-05-15 Radiant Medical, Inc. Method of controlling body temperature while reducing shivering
US6264679B1 (en) * 1999-08-20 2001-07-24 Radiant Medical, Inc. Heat exchange catheter with discrete heat exchange elements

Also Published As

Publication number Publication date
EP1416892A1 (en) 2004-05-12
WO2003015673A8 (en) 2003-08-14
EP1416892A4 (en) 2010-10-20
WO2003015673A9 (en) 2004-05-06
WO2003015673A1 (en) 2003-02-27
JP2004538087A (en) 2004-12-24
CA2454607C (en) 2010-04-06
AU2002326640B2 (en) 2008-05-01

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Effective date: 20200831