Apparatus for delivery of gas to patients
First Claim
1. Apparatus for controlled delivery of gas to a patient which apparatus is operatively connectable to a gas supply and to means for withdrawing waste gas, the apparatus comprising an outlet duct for conveying gas from the gas supply to the patient, a chamber disposed around said outlet duct for receiving gas exhausted by said patient, and a waste gas inlet duct having an opening for receiving gas exhaled by said patient from outside of said outlet duct and from inside of said outlet duct;
- characterized by further including means for diverting exhaled gas from the outlet duct to the waste gas inlet duct, whereby gas exhaled by said patient into said outlet duct is also received in said waste gas inlet duct.
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Accused Products
Abstract
Apparatus (10) is provided for controlled delivery of gas to a patient. The apparatus is particularly useful for delivery of anaesthetic gases in circumstances where the patient is conscious and able to receive gas upon demand and also where ventilation is poor. The apparatus (10) includes an outlet duct (40) for conveying gas from a gas supply (25) to the patient. A waste gas inlet duct (60) is also provided for receiving gas exhaled by the patient. This is connectable to a suction source (at 35) for scavenging the waste gas. The waste gas inlet duct (60) is arranged so that it can receive gas exhaled by the patient with the outlet duct (via a valve or other diverting means (80)) and around the outlet duct (as guided by shroud (70)).
63 Citations
17 Claims
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1. Apparatus for controlled delivery of gas to a patient which apparatus is operatively connectable to a gas supply and to means for withdrawing waste gas, the apparatus comprising an outlet duct for conveying gas from the gas supply to the patient, a chamber disposed around said outlet duct for receiving gas exhausted by said patient, and a waste gas inlet duct having an opening for receiving gas exhaled by said patient from outside of said outlet duct and from inside of said outlet duct;
- characterized by further including means for diverting exhaled gas from the outlet duct to the waste gas inlet duct, whereby gas exhaled by said patient into said outlet duct is also received in said waste gas inlet duct.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. Apparatus for controlled delivery of gas to a patient which apparatus is operatively connectable to a gas supply and to means for withdrawing waste gas, the apparatus comprising:
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an outlet duct for conveying gas from the gas supply to the patient; a shroud defining a chamber disposed around said outlet duct for receiving gas exhausted by the patient, the shroud being adapted to be placed over the patient'"'"'s nose and mouth; a waste gas inlet duct which is arranged to receive gas that is exhaled by the patient into said chamber directly from the chamber such that the gas exhaled into the chamber by-passes the outlet duct; and means for diverting exhaled gas from the outlet duct and to the waste gas inlet duct such that gas which is exhaled by the patient directly into the outlet duct is received in said waste gas inlet duct through the diverting means.
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Specification