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 distal end configured for insertion into a nostril or mouth of a patient;
a heat transfer medium supply tube that defines an inflow lumen and forms a heat transfer region, wherein the heat transfer region is configured to transfer heat to or extract heat from the esophagus when a heat transfer medium flows through the inflow lumen;
a heat transfer medium return tube that defines an outflow lumen;
an input port for receiving the heat transfer medium from a source, wherein said input port is connected to the heat transfer medium supply tube; and
an output port for returning the heat transfer medium to the source, wherein said output port is connected to the heat transfer medium return tube;
wherein the heat transfer region is not inflatable;
wherein the heat transfer medium return tube is not positioned within the heat transfer medium supply tube; and
wherein the heat transfer medium supply tube and the heat transfer medium return tube have substantially equal inside diameters.
2. The device of claim 1 , wherein the heat transfer region has a surface area of at least about 100 cm 2 .
3. The device of claim 1 , further comprising a temperature sensor.
4. The device of claim 1 , wherein the heat transfer medium return tube and the heat transfer medium supply tube are arranged in parallel.
5. The device of claim 4 , wherein the heat transfer medium return tube and the heat transfer medium supply tube share a common inner wall.
6. The device of claim 1 , further comprising a sensor for detecting a parameter and generating a signal representative of the parameter.
7. An esophageal heat transfer device comprising:
a heat transfer medium supply tube that defines an inflow lumen;
a heat transfer medium return tube that defines an outflow lumen;
wherein the heat transfer medium supply tube and the heat transfer medium return tube are configured such that at least a portion of an exterior wall of the heat transfer medium supply tube is in contact with esophageal tissue upon placement of the device in a patient;
wherein the portion of the exterior wall constitutes a heat transfer region configured to transfer heat to or extract heat from the esophageal tissue when a heat transfer medium flows through the inflow lumen;
wherein the heat transfer region is not inflatable; and
wherein the heat transfer medium return tube is not positioned within the heat transfer medium supply tube.
8. The device of claim 7 , wherein the heat transfer medium supply tube and the heat transfer medium return tube have substantially equal diameters.
9. The device of claim 7 , wherein the heat transfer medium return tube and the heat transfer medium supply tube are arranged in parallel.
10. The device of claim 9 , wherein the heat transfer medium return tube and the heat transfer medium supply tube share a common inner wall.
11. The device of claim 7 , further comprising an input port for receiving a heat transfer medium from a source, wherein said input port is connected to the heat transfer medium supply tube.
12. The device of claim 11 , further comprising an output port for returning the heat transfer medium to the source, wherein said output port is connected to the heat transfer medium return tube.
13. The device of claim 7 , further comprising a temperature sensor.
14. The device of claim 7 , further comprising a sensor for detecting a parameter and generating a signal representative of the parameter.
15. An esophageal heat transfer device comprising:
a distal end configured for insertion into a nostril or mouth of a patient;
a proximal end comprising an input port for receiving a heat transfer medium from a source and an output port for returning the heat transfer medium to the source;
a length of tubing that defines a multi-lumen cavity, the length of tubing comprising an inner divider wall disposed longitudinally therein, the inner divider wall dividing the cavity into at least a first lumen and a second lumen, wherein the first lumen and the second lumen are arranged in parallel to each other, and wherein the first lumen and the second lumen are in fluid communication with each other, thereby defining a fluid path for flow of the heat transfer medium;
wherein the first lumen is defined by a first circumferential portion of an interior wall of the length of tubing and the inner divider wall and the second lumen is defined by a second circumferential portion of an interior wall of the length of tubing and the inner divider wall; and
wherein at least a portion of an exterior wall of the length of tubing is in contact with esophageal tissue upon placement of the device in a patient and the portion of the exterior wall constitutes a non-inflatable heat transfer region configured to transfer heat to or extract heat from the esophageal tissue when the heat transfer medium flows through the first and/or second lumen.
16. The device of claim 15 , further comprising a temperature sensor.
17. The device of claim 15 , wherein the inner divider wall is connected to or coextensive with the interior wall of the length of tubing.
18. The device of claim 15 , wherein a first end of the inner divider wall is connected to or coextensive with a first site on the interior wall of the length of tubing and a second end of the inner divider wall is connected to or coextensive with a second site on the interior wall of the length of tubing.
19. The device of claim 15 , wherein the first site on the interior wall of the length of tubing and the second site on the interior wall of the length of tubing are about 180 degrees apart.
20. The device of claim 15 , further comprising a sensor for detecting a parameter and generating a signal representative of the parameter.