Breathing system
First Claim
1. A respiratory apparatus for supplying breathing gas to a user, said apparatus comprising:
- a respiratory circuit including a first variable volume chamber which contracts and expands during inhalation and exhalation respectively and which functions as a respiratory flow transducer subjected to the breathing gas demand by said user, a connection means for supplying breathing gas to and receiving exhaled gas from a user;
an oxygen flow regulator connected to said respiratory circuit for the introduction of oxygen and comprising a second variable volume chamber and a normally closed oxygen admission valve connected between the second variable volume chamber and the respiratory circuit, which valve opens in response to excess pressure in the second variable volume chamber to admit oxygen into said respiratory circuit;
an oxygen supply inlet connected to said oxygen flow regulator; and
,linkage means connecting said first and second variable volume chambers and constraining the first and second variable volume chambers to operate together, whereby there is a substantially constant ratio between the breathing gas flow rate and the oxygen flow rate.
2 Assignments
0 Petitions
Accused Products
Abstract
A respiratory apparatus, which receives exhaled gas from a user, removes carbon dioxide from and introduces oxygen into the exhaled gas, to present a breathing gas to a user. A respiratory flow transducer in the respiratory apparatus is subjected to the breathing gas demand of the user. Oxygen is introduced into the breathing system by an oxygen flow regulator connected to an oxygen supply inlet. The respiratory flow transducer and the oxygen flow regulator are connected by a linkage. The linkage constrains the oxygen flow regulator and respiratory flow transducer to operate together whereby there is a substantially constant ratio between the breathing gas flow rate and the oxygen flow rate.
An air bleed system can be connected to an air inlet to introduce air into the respiratory apparatus and to displace a portion of the gas from the respiratory apparatus. The air bleed system ensures a relatively constant oxygen concentration in the breathing gas presented to the user despite varying oxygen demands placed upon the respiratory apparatus by the user.
62 Citations
29 Claims
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1. A respiratory apparatus for supplying breathing gas to a user, said apparatus comprising:
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a respiratory circuit including a first variable volume chamber which contracts and expands during inhalation and exhalation respectively and which functions as a respiratory flow transducer subjected to the breathing gas demand by said user, a connection means for supplying breathing gas to and receiving exhaled gas from a user; an oxygen flow regulator connected to said respiratory circuit for the introduction of oxygen and comprising a second variable volume chamber and a normally closed oxygen admission valve connected between the second variable volume chamber and the respiratory circuit, which valve opens in response to excess pressure in the second variable volume chamber to admit oxygen into said respiratory circuit;
an oxygen supply inlet connected to said oxygen flow regulator; and
,linkage means connecting said first and second variable volume chambers and constraining the first and second variable volume chambers to operate together, whereby there is a substantially constant ratio between the breathing gas flow rate and the oxygen flow rate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification