Respiratory aid

Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure

Reexamination Certificate

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Details

C128S204230, C128S205230, C128S202220, C128S202270, C128S200120, C128S204250, C128S912000, C600S531000, C600S532000, C600S543000

Reexamination Certificate

active

06273087

ABSTRACT:

The present invention relates to a respiratory assistance device which can be used on patients whose spontaneous respiration is absent or insufficient, whether or not they are placed under artificial respiration.
European Patent EP-A-0 390 684 (U.S. Pat. No. 5,036,847) has already disclosed a tubular respiratory assistance device, which forms a main channel and which is intended to be connected by its distal end to a patient's airway so that said main channel connects said patient's respiratory system to the outside, said device having at least one auxiliary channel associated with deflection means for injecting a respiratory gas jet which is deflected toward the interior of said main channel and is intended to ventilate said patient.
The object of the present invention is to improve such a device so that the doctor can ascertain the gas pressure and/or the gas composition in said patient's airway.
To that end, according to the invention, the respiratory assistance device of the type summarized above is noteworthy in that it has, on the distal side, an annular chamber arranged at the periphery of said tubular device, coaxially with it and communicating with the patient's respiratory system by means of the orifice formed by its distal annular section, and in that said annular chamber is provided with means for connection to the outside.
It is thus possible to measure the pressure and/or determine the composition of the gas contained in said chamber. It will be noted that this gas is identical to the one prevailing in the respiratory system but is quietened compared with it because of its partial isolation by the chamber. The measurements are therefore reliable, avoiding the consequences of gas turbulence.
In particular for the purpose of rendering the gas contained in the chamber homogeneous, it is then preferable for said means of connection to the outside to be arranged at the proximal end of said chamber.
In the case where the gases contained in said chamber need to undergo compositional analysis and pressure measurement, said chamber should have a relatively large volume, corresponding to the quantity of gas needed for the analysis. Turbulence capable of inducing strong variations in the pressure measurements may then occur in said chamber.
In order to avoid this, it is advantageous to provide means for damping gas turbulence, such as a fibrous or porous filter, in said chamber.
As security in addition to an optional pressure measurement device, it is advantageous for the device according to the present invention to have a network of grooves made in the wall of the main channel and at least one orifice passing through the proximal part of said device so as to form an access to the atmosphere for said patient's respiratory system, in the event of accidental obstruction of the proximal part of said device.
There are many possible applications for the tubular respiratory assistance device according to the invention. It may be used as a buccal or nasal probe, or alternatively as an adapter attached to a tracheotomy tube. It may also, in a respiratory mask intended to be fitted to a patient's face, constitute the tubular adapter for inlet and outlet of the respiratory gas. In this case, said chamber is in communication with the patient's respiratory system via the interior of said mask.
When it is used as a respiratory mask adapter, the respiratory assistance device according to the present invention may be integral with said mask. However, in particular in order for it to be usable on its own, without a mask, it may be advantageous for said device to be fitted removably to said mask, for example by engagement.


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patent: WO 97/06843 (1997-02-01), None

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