Anesthetic vaporizers

Details Anesthetic vaporizers Anesthetic vaporizers

1994-11-16

1996-07-16

Yan, Ren

Surgery

Respiratory method or device

Means for mixing treating agent with respiratory gas

12820312, 12820325, 12820326, 12820327, 12820414, 12820421, A61M 1600

Patent

active

055357377

ABSTRACT:
An anesthetic vaporizer 1 includes an inlet 2 for carrier gas, an outlet 4 for carrier gas and anesthetic agent, a first passage 6 interconnecting the inlet to the outlet and a first fixed flow restrictor 8 located in the passage 6. A second passage 56 extends between a vaporizing chamber and the outlet 4 and located therein is a second fixed flow restrictor 54 and also a solenoid valve 58. A first pressure transducer 50 generates an electrical signal corresponding to the pressure differential P1 across the restrictor 8; and a second pressure transducer 52 generates an electrical signal corresponding to the pressure differential P2 between the passages 6, 56. A controller responsive to said electrical signals from the pressure transducers 50, 52 transmits an electrical signal to the valve 58 for controlling the flow of gaseous anesthetic agent through the passage 56 such that P2=P1.times.constant.

REFERENCES:
patent: 3593710 (1971-07-01), Eichelman et al.
patent: 3739799 (1973-06-01), Bickford et al.
patent: 3741208 (1973-06-01), Jonsson et al.
patent: 3923056 (1975-12-01), Bingmann et al.

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