Devices and methods for controlling patient temperature
Relatively non-invasive devices and methods for heating or cooling a patient's body are disclosed. Devices and methods for treating ischemic conditions by inducing therapeutic hypothermia are disclosed. Devices and methods for inducing therapeutic hypothermia through esophageal cooling are disclosed. Devices and methods for operative temperature management are disclosed.
1. An esophageal heat transfer device comprising:
(a) a plurality of lumens configured to provide a fluid path for flow of a heat transfer medium;
(b) a heat transfer region configured for contacting esophageal epithelium of a patient;
(c) a proximal end including an input port and an output port;
(d) a distal end configured for insertion into an esophagus of a patient, the heat transfer device further comprising a hollow tube having a distal end configured to extend into a stomach of said patient.
2. The heat transfer device of claim 1 , wherein said heat transfer region is capable of contacting substantially all of the esophageal epithelium.
3. The heat transfer device of claim 1 , wherein said heat transfer region comprises a semi-rigid material.
4. The heat transfer device of claim 1 , wherein said device is capable of cooling at a rate of about 1.2° C./hr to about 1.8° C./hr.
5. The heat transfer device of claim 1 , wherein said device is capable of cooling a mass at a rate of about 350 kJ/hr to about 530 kJ/hr.
6. The heat transfer device of claim 5 , wherein said device is capable of cooling a mass at a rate of about 430 kJ/hr.
7. The heat transfer device of claim 1 , wherein said device includes a heat transfer region with a surface area of at least about 100 cm 2 .
8. The heat transfer device of claim 7 , wherein said heat transfer region has a surface area of about 140 cm 2 .
9. A system for cooling or warming at least one portion of a patient's body, comprising:
a heat transfer device including a proximal end, a distal end, and at least one semi-rigid tube extending therebetween;
said proximal end including a heat transfer medium input port and a heat transfer medium output port;
said distal end configured for insertion into an orifice of a patient;
said at least one semi-rigid tube defining an inflow lumen and an outflow lumen;
said lumens configured to provide a fluid path for flow of a heat transfer medium;
a supply line connected to said input port;
a return line connected to said output port; and
a hollow tube having a distal end configured to extend into a stomach of said patient.
10. The system of claim 9 , wherein said orifice is an esophageal lumen.
11. The system of claim 10 , wherein said heat transfer device comprises a heat transfer region capable of contacting substantially all of the esophageal epithelium.
12. The system of claim 9 , wherein said device is capable of cooling at a rate of about 1.2° C./hr to about 1.8° C./hr.
13. The system of claim 9 , wherein said device is capable of cooling a mass at a rate of about 350 kJ/hr to about 530 kJ/hr.
14. The system of claim 13 , wherein said device is capable of cooling a mass at a rate of about 430 kJ/hr.
15. The system of claim 9 , wherein said device includes a heat transfer region with a surface area of at least about 100 cm 2 .
16. The system of claim 15 , wherein said heat transfer region has a surface area of about 140 cm 2 .
17. A system for controlling core body temperature of a subject, comprising:
a heat transfer tube insertable within the esophagus of said subject, wherein said tube is configured to contact the epithelial lining of the esophagus;
an external heat exchanger containing a heat transfer fluid;
a pump for flowing said heat transfer fluid through a circuit within the heat transfer tube;
a heat transfer element in contact with the external heat exchanger;
a sensor for detecting a parameter and generating a signal representative of the parameter, wherein the signal is transmitted to a microprocessor to control (i) the flow heat transfer fluid within the circuit or (ii) the temperature of the heat transfer fluid; and
a hollow tube having a distal end configured to extend into a stomach of said subject.
18. The system of claim 17 , wherein said sensor is a temperature sensor positioned distal to the heat transfer tube and configured to generate a signal representing the core body temperature of said subject.
19. The system of claim 18 , wherein said microprocessor receives a target temperature input and responds to said signal from said temperature sensor with a proportional integrated differential response to control the rate at which said subject approaches said target temperature.
20. The system of claim 17 , wherein said sensor is a bubble detector and configured to generate a signal representing the presence of air in the circuit.
21. The system of claim 17 , wherein said heat transfer tube comprises a heat transfer region capable of contacting substantially all of the esophageal epithelium.
22. The system of claim 17 , wherein said system is capable of cooling at a rate of about 1.2° C./hr to about 1.8° C./hr.
23. The system of claim 17 , wherein said system is capable of cooling a mass at a rate of about 350 kJ/hr to about 530 kJ/hr.
24. The system of claim 17 , wherein said system is capable of cooling a mass at a rate of about 430 kJ/hr.
25. The system of claim 17 , wherein said system includes a heat transfer region with a surface area of at least about 100cm 2 .
26. The system of claim 25 , wherein said heat transfer region has a surface area of about 140 cm 2 .