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Apparatus for warming and moistening a respiration gas

  • US 4,200,094 A
  • Filed: 03/03/1978
  • Issued: 04/29/1980
  • Est. Priority Date: 04/05/1977
  • Status: Expired due to Term
First Claim
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1. Apparatus for warming and moistening a respiration gas for a patient, comprising a housing having a gas passage therethrough, said gas passage having a first fluid flow portion, one end of said first fluid flow portion including means for direct fluid flow communication with the mouth of the patient to receive exhalation gas flow from the patient when the patient exhales and for supplying a respiration gas to the patient when the patient inhales, the other end of said first fluid flow portion terminating within said housing, said gas passage having a second fluid flow having a second fluid flow portion, one end of said second fluid flow portion terminating within said housing and being in fluid communication with said other end of said first fluid flow passage, a respiration vessel connected with the gas passage and in fluid flow communication with the other end of said second fluid flow portion for supplying the respiration gas to said second fluid flow portion, means communicating with said other end of said second fluid flow portion for directing said exhalation gas flow from said patient to atmosphere, a moisture storage comprising gas-permeable, hygroscopic material in said gas passage, said other end of said first fluid flow portion comprising lamallae (7) disposed thereacross in the direction of flow of the exhalation gas, said lamellae (7) have interspaces in fluid flow communication with the first fluid flow portion at the gas inlet sides thereof, with said moisture storage (6) disposed over the exit sides thereof, whereby when the patient exhales, exhalation gas flows through the first fluid flow portion, the interspaces, the moisture storage, the second fluid flow portion to atmosphere and accumulates heat and moisture in said interspaces and in said moisture storage and when the patient inhales, inhalation gas flows from said respiratory vessel, through the second fluid flow portion, the moisture storage, the interspaces, the first fluid flow portion to the patient and collects the heat and moisture accumulated in the interspaces and moisture storage.

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