EP0640356A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Device for supplying breathing gas

Assignee: Siemens Elema AB

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Filing: 1994-06-01

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Granted: —

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Expires: 2014-06-01

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Abstract

Abstract The invention relates to a device (2) which supplies breathing gas mixed with an additive gas to a patient for pulmonary diagnosis or pulmonary treatment. The device (2) comprises a gas mixing unit (4) through which a relatively large flow of breathing gas is achieved from a first gas source (6) through a first pressure regulator (8) and a second pressure regulator (10). The breathing gas passes through a connecting tube (24) from which the patient can breathe spontaneously through an inspiration tube (26), thereby inhaling air from the connecting tube (24). Expired gas passes via an expiration tube (36) to the connecting tube (24). Additive gas is supplied from a separate gas source (16) via a second pressure regulator (18) and a second flow regulator (20). The additive gas is supplied in a flow which is considerably smaller than the flow of breathing gas, whereby a very small but accurate concentration of the additive gas can be achieved in the breathing gas. The large flow prevents a reactive additive gas from reacting before being supplied to the patient.

Inventors

👤 Sven-Gunnar Olsson
👤 Göran Rydgren
👤 Anders Larsson

Bibliographic Details

Application Number —

Jurisdiction EP

Data Source google_patents

Last Synchronized 2026-10-28 14:16

CPC Classifications

A; A61; A61M; A61M16/00; A61M16/10; A61M16/12; A61M16/0003; A61M2016/003; A61M2016/0033; A61M2016/0036; A61M2016/0042; A61M16/1005; A61M2016/102; A61M2016/1035; A61M2202/00; A61M2202/02; A61M2202/0266; A61M2202/0275

Claims Analysis

Total Claims: 8

Claim 1

Independent Claim 268 words

A device (2, 52) for supplying a breathing gas containing a predetermined concentration of a specific additive gas to the lungs of a living creature, comprising an inspiration tube (26; 78) through which a breathing gas and an additive gas are delivered to the lungs, an expiration tube (36; 38) through which expired gas is carried away from the lungs, a first adjustable gas source (6, 8, 10; 56, 60) for supplying the breathing gas to the inspiration tube (26; 78) and a second adjustable gas source (16, 18, 20; 66, 70, 72) for supplying at least the additive gas to the inspiration tube (26; 78), characterized in that the first gas source (6, 8, 10; 56, 60) supplies a continuous flow of the breathing gas, the second gas source (16, 18, 20; 66, 70, 72) supplies a continuous flow of the additive gas, a connecting tube (24; 76) is connected to the gas sources (6, 8, 10, 16, 18, 20; 56, 60, 66, 70, 72) and a gas evacuation system, whereby the gas sources (6, 8, 10, 16, 18, 20; 56, 60, 66, 70, 72) supply the breathing gas and the additive gas for mixing in the connecting tube (24; 76), mixed gas passes through the connecting tube (24; 76) to the gas evacuation system and the inspiration tube (26; 78) is connected to the connecting tube (24; 76) between the gas sources (6, 8, 10, 16, 18, 20; 56, 60, 66, 70, 72) and the gas evacuation system, whereupon breathing gas and additive gas pass through the inspiration tube (26; 78) to the lungs during inhalation.

Claim 2

Dependent Claim 34 words

A device according to claim 1, characterized in that the expiration tube (36; 86) is connected to the connecting tube downstream from the inspiration tube's (26; 78) connection to the connecting tube (24;: 76).

Claim 3

Dependent Claim 34 words

A device according to claim 1 or 2, characterized in that a first gas meter (30; 82) is connected to the inspiration tube (26; 78) in order to measure the concentration of additive gas.

Claim 4

Independent Claim 33 words

A device according to any of the above claims, characterized in that a second gas meter (40) is connected to the expiration tube (36) in order to measure the concentration of additive gas.

Claim 5

Independent Claim 39 words

A device according to any of the above claims, characterized in that the first gas source (56, 60) comprises a fan (60) for generating the predetermined, continuous flow of breathing gas, whereby the breathing gas consists of ambient air.

Claim 6

Independent Claim 28 words

A device according to any of the above claims, characterized in that the additive gas consists of any of the gases NO, SF₆, N₂O or an inert gas.

Claim 7

Dependent Claim 48 words

A device according to claim 6, characterized in that when the additive gas consists of NO, an inert gas or N₂O, an exact mixture of the additive gas and SF₆ is used, whereby the SF₆ concentration is measured in order to determine the concentration of the additive gas.

Claim 8

Independent Claim 29 words

A device according to any of the above claims, characterized in that the continuous flow of mixed gas is at least as large as the living creature's minute volume.

References Cited (Backward Citations)

EP0149722A2 Cited

EP0166305A2 Cited

US4903693A Cited

EP0570612A1 Cited

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