A device for treating carbon monoxide poisoning includes a light emitter that emits light having a wavelength in the range of from 600 to 750 nm. An upper clothing of the present invention emits light having a wavelength in the range of from 600 to 750 nm on the inside of a front body and/or a back body. A catheter of the present invention includes a catheter body that has a distal end portion formed of a light-transmissive material and that includes a plurality of lumens; a light emitter that emits light having a wavelength in the range of from 600 to 750 nm to allow the light to exit through a first lumen from the distal end portion of the catheter body; a balloon that is disposed around a circumferential surface of the distal end portion, that is in communication with a second lumen, and that guides the distal end portion to downstream blood flow in an inflated state; and a pressure sensor that is disposed at the distal end of the distal end portion and that is connected to a cable inserted through a third lumen.
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