DE29613610U1 - Breathing tube - Google Patents

Description

Ventilation tube

The invention relates to a ventilation tube as used in ventilators, e.g. for ventilating patients during anesthesia and in the intensive care unit.
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The tubes used to date on ventilators have a completely separate tube to separate the inspiration path from the expiration path, which means that two tubes are used for ventilation and, in the case of anesthesia machines, a third tube is used for manual ventilation. This large number of tubes complicates working with ventilators, which can be dangerous, especially in emergency medicine.

The object of the invention is to provide a ventilation tube for ventilation and anesthesia devices that enables easy handling.

This problem is solved by the features of claim 1.

The previously usual two tubes for inhalation and exhalation are replaced by a single tube, which, with a membrane in the lumen, provides two ventilation channels in a tube cover. Combining the two ventilation tubes into a single ventilation tube simplifies handling and handling of a ventilator. The ventilation tube according to the invention can be designed both as a disposable material and in a reprocessable form, using suitable materials. In particular, if ventilation tubes are used as a disposable product

The low use of materials in the ventilation tube according to the invention is significant and reduces the burden on the environment, as less material has to be disposed of. The presence of one tube instead of two also reduces the effort required for processing in the case of reusable ventilation tubes. This means that a larger number of ventilation tubes can be washed using the existing processing or washing systems for reusable ventilation tubes.

The membrane is preheated by the warm gas flowing in the expiratory channel and this heat is transferred to the cold ventilation gas flowing in the inspiratory channel, i.e.

i.e. the cold ventilation gas is preheated by the warm exhaled gas. By preheating the ventilation gases, they can advantageously absorb more moisture. Since inspiration and expiration take place alternately, the membrane should preferably be heat-conducting, but also have a certain heat storage capacity.

The membrane can be made of rigid or flexible material, but must reliably prevent the inner lumen of the tube from becoming blocked, even with tight curve radii. When using a rigid membrane, the inner lumen of the tube must be sufficiently dimensioned to reliably prevent turbulent flows and pressure increases during forced breathing or ventilation. A cross-section of 10 to 25 mm should be achieved per membrane-separated leg. The different dimensions depend on the intended use, either the ventilation of neonates, infants, children

up to adults.
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In the case of using a flexible membrane, differences arise in such a way that the membrane

When one leg is used, the flexibility of the membrane narrows the leg that is not being used and the space gained is made available to the leg that is currently active. This can lead to a reduction in the outer diameter of the tube. The inner lumen of such a tube can also be 10 to 25 mm per leg. However, it is also possible to use the advantages of the flexible membrane without reducing the outer diameter.

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In both cases, the outer casing of the hose should have a kink protection, in the form of pleating that is already common today, or an endless spiral connected to the hose.

When using conventional materials such as silicone and PVC, the wall thickness of the membrane is in the range between 0.2 and 1.5 mm. If materials are used that reliably prevent the diffusion of the respiratory gases through the membrane even with a lower wall thickness, the minimum wall thickness can be adjusted downwards.

The end of the ventilation tube that points towards the ventilator ends in two partial tubes with a length of 20 to 50 cm. The connection sleeves preferably correspond to the ISO standard. The length of these independent partial tubes can be determined according to the requirements of the respective ventilator.

The patient-side end of the ventilation tube ends with both ventilation channels in an ISO sleeve, which usually has a diameter of 22 mm.

The length of the membrane tube depends on the requirements of the practice and should be between 80 cm and 150 cm for use in anesthesia or ventilation.

However, deviations are possible without loss of functionality.

Production of different hose lengths is already common practice today.

The total length of the hose is the dimensions of the membrane hose plus the length of the independent leg.

List of reference symbols

Figure 1 : Double-luid supply hose

1, Outer hose cover

2, Membrane flexible or fixed

3, inspiration limb or expiratory limb

4, sleeve

Figure 2 ; Cross section of double-luid supply hose

L Outer tube cover 2, Meibran , solid

Figure 3: Cross section of double-luid supply hose

L Outer hose cover 2, Meibran , flexible

Claims (4)

Expectations 1. Ventilation tube for a ventilator with a tube cover and a longitudinal gas-tight membrane that splits the tube cover into a channel for inspiration and a channel for expiration. 2. Ventilation tube according to claim 1, characterized in that the membrane is flexible. 3. Ventilation tube according to claim 1 or 2, characterized in that the membrane is heat-conducting. 4. Ventilation tube according to at least one of the preceding claims, characterized in that in at least one end region the two ventilation channels merge into two separate partial tubes.