Methods and devices for non-invasive cerebral and systemic cooling alternating liquid mist/gas for induction and gas for maintenance
Devices for cerebral and systemic cooling via a patient's nasopharyngeal cavity are described. Cooling assemblies include at least one elongate tubular member having first and second lumens, a source of liquid coolant, a gas source communicating with the first lumen, and a switch for alternately connecting the liquid coolant source to the second lumen. The first lumen transports a compressed gas and the second lumen transports a volatile liquid. The pressurized fluid may be a perfluorocarbon. The perfluorocarbon may be perfluorohexane, perfluoropentane, or 2-methyl-perfluoropentane. The gas may be air, oxygen, or a combination.
1. A medical device for cerebral cooling comprising:
an elongate tubular member having proximal and distal ends, an outer wall having a plurality of delivery ports, and first and second lumens, the first and second lumens extending from a proximal region to the delivery ports and in communication with the plurality of delivery ports;
a source of liquid coolant;
a gas source in fluid communication with the first lumen; and
a switch for alternately connecting the liquid coolant source to the second lumen,
wherein the first lumen transports a compressed gas and wherein the second lumen transports the liquid coolant.
2. The device of claim 1 , wherein the liquid coolant is a perfluorocarbon.
3. The device of claim 2 , further comprising:
a plurality of mixing channels extending between said plurality of delivery ports and said first lumen; and
a plurality of connecting tubes extending between said plurality of mixing channels and said second lumen,
the first and second lumens arranged such that in use the perfluorocarbon and compressed gas are separately transported from the proximal end to the plurality of delivery ports on the outer wall the of the elongate tubular member.
4. The device of claim 2 , wherein the perfluorocarbon is selected from the group consisting of perfluorohexane, perfluoropentane, and 2-methyl-perfluoropentane.
5. A medical device for cerebral cooling comprising:
a first elongate tubular member adapted for insertion into a nasal cavity of a patient through a patient's first nostril, the first elongate tubular member comprising a proximal end, a distal end, a lumen extending therebetween, and a plurality of ports in fluid communication with the lumen;
a second elongate tubular member adapted for insertion into a nasal cavity of a patient through the patient's second nostril, the second elongate tubular member comprising a proximal end, a distal end, a lumen extending therebetween, and a plurality of ports on the distal end of the second elongate tubular member in communication with the lumen;
a manifold in fluid communication with the lumens of the first and second elongate tubular members, the manifold further communicating with a third and a fourth elongate tubular member; and
a reservoir containing gas and a pressurized fluid, the pressurized fluid having a boiling point of less than 37° C. in communication with the third elongate tubular member and the gas in communication with the fourth elongate tubular member.
6. The device of claim 5 , wherein the pressurized fluid is a perfluorocarbon.
7. The device of claim 6 , wherein the perfluorocarbon is selected from the group consisting of perfluorohexane, perfluoropentane, and 2-methyl-perfluoropentane.
8. The device of claim 5 , wherein the gas is air, oxygen, or a combination thereof.