WO2014095858A1

WO2014095858A1 - Medical hose unit and device for administering a respiratory gas

Info

Publication number: WO2014095858A1
Application number: PCT/EP2013/076896
Authority: WO
Inventors: Gunther Weiszl
Original assignee: Linde Aktiengesellschaft
Priority date: 2012-12-17
Filing date: 2013-12-17
Publication date: 2014-06-26
Also published as: DE102012223445A1

Abstract

The present invention relates to a medical hose unit with an inner lumen (186) for transporting respiratory gas to a patient and an outer lumen (187) enclosing said inner lumen for transporting a gas thermally insulating the inner lumen (186) from the environment of the hose unit, particularly for transporting heated air.

Description

description

Medical tube unit and device for administering a Atemqases

The invention relates to a medical hose unit and to a device designed for such a hose unit for administering a respiratory gas, in particular for providing a high-flow therapy.

State of the art

There are various therapies are known in which a patient z. B. oxygenated breathing gas is administered.

In so-called high-flow or high-flow humidification therapy (HFT), a humidified, warm breathing gas, in particular oxygen-enriched air, is administered to the patient via a nasal cannula.

In a delivery tube of a high-flow therapy delivery device, respiratory gas supplied, heated and humidified in a supply unit of the device in a desired composition is delivered to the patient at a relative humidity of about 100%. This can lead to a condensation of moisture (so-called excitation). Cause is the lower ambient temperature, which is a heat exchange over the

Hose wall generated. In the case of such excitation, the respiratory gas entering the respiratory tract of the patient does not have the desired relative

Moisture of about 100%. Furthermore, condensed water may also enter the respiratory tract, reducing the comfort of the device.

From WO 2005/09073007 A1 it is known, to avoid or minimize such excitation, to form a supply tube for respiratory gas with a divided envelope through which heated water circulates. As a result, a condensation of respiratory gas on the inner wall of the supply hose in

Essentially avoided. A disadvantage is to be considered that such a surrounding of a water supply hose when using relatively stiff or is rigid, whereby the handling is difficult. Another disadvantage is the fact that after an interruption of the therapy, the flow of water is stopped, whereby the isolation is no longer given and at a restart of the therapy, first a surge of water can escape from the cannula. Furthermore, this solution is considered technically complex and results in uneconomically high production costs.

It is also known to heat the walls of the supply tube by means of heating wire to avoid condensation on the inside of a supply hose. This technology is also considered to be expensive, especially since electrical connections and insulation are needed.

The present invention seeks to avoid excitation during high-flow therapy by simple means.

This object is achieved with a medical hose unit having the features of claim 1 and a device for administering a respiratory gas, in particular for providing a high-flow therapy with the features of patent claim 2.

With the medical hose unit according to the invention and the

inventive device is in a simple manner z. As a high-flow therapy can be provided, in which the problems associated with excitation can be largely avoided. The invention provides a particularly simple and reliable insulation for an inner lumen, through which provided and conditioned breathing air is supplied to a patient, by

irrespective of the administration of the respiratory gas flow, a heat-insulating gas, in particular heated air, is transported in a direction towards the patient through an outer lumen surrounding the inner lumen. Under heated air is understood in particular at body temperature or above heated air, z. B. at 38 ° C, 40 ^< €, 42 ^< €, 44 ° C, 46 ° C or heated to a higher temperature air. It should be noted that the device according to the invention is characterized in that the transport of breathing air through the inner lumen and the transport of heat-insulating gas through the outer lumen in the same direction, namely from the distal to the proximal end of the hose unit to Patients out. This particular is a precise control of

Heat insulation available.

Further advantages and embodiments of the invention will become apparent from the

Description and attached drawing.

According to the invention, use is made in particular of the fact that the hose unit is connected to the supply unit so that it supplies the gas supply required for the respiratory gas supply (in particular compressed air or fan) and

Heat generation (especially heaters or heat-generating components) can exploit. In particular, air is used as respiratory gas.

According to a particularly preferred embodiment, the breathing gas supply unit of the device according to the invention has a

Oxygen supply device and an air supply device and means for mixing air and oxygen (for example, a fan) for

Providing a suitable breathing gas, wherein a breathing gas thus provided is introduced into the inner lumen of the hose unit of the device. According to a particularly preferred embodiment of the device according to the invention an additional line is provided, which is connected to the outer lumen of the hose unit, and via which air from the

Air supply device, if - not previously in sufficient heat available to be additionally heated - in the externa ßere lumen can be introduced. This is in a particularly simple manner heated air is the externa ßere lumen of the hose unit can be introduced, for which air, the same air source can be used as for the breathing gas, which is guided through the inner lumen.

Particularly preferred is the provision of at least one heating unit for heating oxygen supplied by the oxygen supply device or air provided by the air supply device.

Equally preferred is the provision of a moistening unit for moistening the respiratory gas to be supplied to the patient. With such a heating unit and / or such a moistening unit, optimally prepared breathing air can be supplied to the patient, whereby the latter can tolerate the high flow rates used in the course of a high-flow therapy without any problems.

The device according to the invention preferably has at least one control valve for controlling the composition and / or the flow of the

Respiratory gas and / or the flow of air in the additional line.

Furthermore, the required temperature in the additional line can be regulated to the desired value, e.g. by admixing ambient air or defined cooling.

Conveniently, a distal end of the hose unit with the

Supply unit, and a proximal end of the hose unit with a

Connected nasal cannula.

The outer lumen is preferably designed such that air is released into the environment in the vicinity of the proximal end of the hose unit. For this purpose, it is particularly preferred that the outer lumen at the proximal end of the

Hose unit is connected to a unit which minimizes the exit flow rate and deflects in preferred directions. Furthermore, it is preferred that the exit be designed so that it can not be blocked by the user.

Preferably, the outlet is designed as a sponge insert or as a unit that deflects the air flow sufficiently. This can be largely avoided for a user unpleasant air currents, which may occur at the proximal end of the hose unit.

It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination indicated, but also in other combinations or in isolation, without departing from the scope of the present invention. The invention is illustrated schematically with reference to an embodiment in the drawing and will be described in detail below with reference to the drawing. figure description

Figure 1 shows a schematic side view of a preferred

Embodiment of the hose unit according to the invention in combination with a preferred embodiment of the device according to the invention.

Figures 2a-2c show alternative embodiments of the device according to the invention.

DETAILED DESCRIPTION OF THE DRAWING A preferred embodiment of the device according to the invention is shown in FIG.

The device 100 has a supply unit 110 for supplying breathing gas and a connected to a proximal end of the supply unit

Hose unit 120 (corresponding to a distal end 120b of the hose unit). Via the hose unit 120, a respiratory gas supplied and processed is supplied to a patient in the supply unit 1, as will be explained further below. At its proximal end 120a, the hose unit 120 can be connected to a nasal cannula, which is shown purely schematically and designated 190.

The supply unit 1 10 has in the illustrated embodiment a

Oxygen supply device 150 and an air supply 152 on. The oxygen supply device 150 may be, for example, a suitable oxygen pressure vessel. The air supply device 152 may also be designed as a pressure vessel, wherein particularly preferably the combination of a suction pump with a compressor for the utilization of

Ambient air is. Air from the air supply 152 and oxygen from the oxygen supply 150 is supplied via respective conduits 181 and 182, respectively in a desired ratio in a line 183 is fed, in which takes place a mixing of oxygen and air. For the exact setting of the

Oxygen content in the resulting breathing gas mixture are in the

Supply lines 181, 182 each control valves 175, 176 formed, which are controlled by a control device 101 shown schematically.

The line 183 is connected to a line 184, via which in a

Moistening unit 160 generated water vapor for humidification of the respiratory gas in the conduit 183 can be introduced.

The supply lines 181, 182 and / or the line 183 are formed with a heating unit 170, by means of which the oxygen supply device 150 and the air supply device 152 exiting or the line 183 flowing through gases to a desired temperature, preferably body temperature or higher, are warm.

Overall, so by the oxygen supply device 150, the

Air supply 152, the humidifier 160 and the heating unit 170 a heated to body temperature, a humidity of up to 100%

Providing breathable gas available.

The supply unit 110 is, as mentioned, coupled to the hose unit 120. This tube unit has an inner lumen 186 and a concentrically surrounding outer lumen 187 on. At the distal end of the hose unit, the inner lumen 186 is connected to the conduit 183 so that in the

Supply unit provided respiratory gas can be transported via the tube unit 120 to the patient.

In line 181 branches off an additional line 185. In this additional line 185, a further control valve 177 is provided.

This additional line 185 is connected to the outer lumen 187 of the hose unit 120. As can be seen from the figure 1, thus heated by the heater 170 heated air from the air supply device 152 in controllable or

controllably guided into the outer lumen 187 of the hose unit 120. With appropriate adjustment of the air temperature in the outer lumen 187, effective thermal insulation for the inner lumen with respect to the environment

provided. By setting a suitable air temperature in the outer lumen 187, it can be ensured, in particular, that the humidified and preferably 100% air humidity-containing breathing gas does not condense in the inner lumen 186. Thus, it can be ensured that from the proximal end 120a of the

Hose unit 120 leaking breathing gas, which enters the nasal cannula 190, which essentially maintains the temperature and humidity provided by the supply unit 1 10th

At the proximal end 120a of the hose unit 120, the provided air exits the outer lumen 187 into the ambient air. In order to avoid an unpleasant air flow for a patient here, for example, a sponge insert 195 is provided in the outlet region of the outer lumen 187. Instead of such a sponge insert, it would also be possible to use suitable sponges

To use flow flaps. The breathing air exiting the inner lumen 186 at the proximal end 120a, as mentioned, enters the nasal cannula 190 connected to the patient. Overall, it can be ensured by means of the device according to the invention that the air entering the patient via the nasal cannula 190 has an optimum temperature (essentially body temperature) and moisture (essentially 100%).

Humidity).

For example, according to a preferred embodiment of the invention, it is conceivable to heat the air introduced into the outer lumen 187 more strongly than the respiratory gas in the inner lumen 186. This can be used, for example, to achieve heat from the respiratory gas during transport through the inner lumen receives air flowing through the outer lumen and is thus further heated during passage through the inner lumen 186 of the hose unit 120. In this case, the temperature of the breathing gas could be chosen correspondingly lower when entering the inner lumen. It proves to be particularly advantageous that the air for the outer lumen 187 and for the provision of the desired breathing gas in the inner lumen can be provided from the same source, namely the air supply device 152. It can thus be exploited the easy availability of ambient air, which can be provided and processed in a very inexpensive manner.

To provide an optimally processed breathing gas, it is possible to provide temperature sensors, not shown in FIG. 1, at suitable positions of the device 100 and, according to the detected temperature values, to control the control valves 175, 176, 177, the heating device 170 and / or the humidifying device 160 to make. However, it is particularly preferred to dispense with such temperature sensors for cost reasons, and the air flow through the outer lumen 187 correspondingly conservative, d. H. with relatively high air temperature and / or flow.

The inner and outer lumen tube unit 120 may be connected to the supply unit 110 at a suitable interface which provides respiratory gas and air in a correspondingly coaxial manner. This requires only a single compound, which is an improvement over conventional solutions using two compounds, for example for breathing gas and heated water. Also the angular orientation of such

Connection can be chosen essentially arbitrary. A simple one

Hose connection, as used for example for single-lumen hoses, is sufficient. For example, conical connectors could be used.

According to the invention, a disruption of the therapy in a particularly simple manner, d. H. the supply of breathing gas to a patient possible, without having to interrupt the flow of heated air through the externa ßere lumen 187. As a result, the insulation effect can be maintained in a simple manner, for example, in the inner lumen remaining breathing gas is not subject to excitation.

In the figures 2a to 2c alternative embodiments of the device according to the invention are shown in a schematically simplified manner. In FIG. 2, one recognizes the air supply unit 152, the oxygen supply unit 150 and the humidification unit 160 have output lines that are brought together in a common point 196, which represents the beginning or the distal end of the line 183. As in the embodiment of FIG. 1, this line 183 is connected directly to the inner lumen 186 of the hose unit 120. It can also be seen that the additional line 185 as the second output line of the

Air supply device 152 is formed. The leadership of the lines 183, 185 and their connection to the lumen 186, 187 proves to be structurally particularly simple.

The embodiment according to FIG. 2b essentially corresponds to that of FIG. 2a, but indicates that the gas supply sources 152 and 150, as well as the moistening unit 160, do not necessarily have to provide the necessary heat energies, but that the heat to be provided for a desired temperature is also present at the point 196 as well as in the additional line 185 can be introduced (by means of schematically illustrated heaters 270).

In Figure 2c, only an alternative air supply for the outer lumen 187 is shown. At the distal end of the line 185, a fan 199 is provided here, by means of which ambient air can be introduced into the additional line 185. The air flow of the fan flows around a heat-emitting element 201, which heats the additional air flow. In a preferred application, the heat-emitting element is the electrical components of the supply unit 1 to be cooled

Temperature sensor measures whether the amount of heat supplied by the element 201 is sufficient or causes excess energy partially to the

Environment is discharged by means of a drain valve 205.

Claims

claims

A medical tubing unit having an inner lumen (186) for transporting breathing gas to a patient, and an outer lumen (187) surrounding the inner lumen for transporting a heat insulating gas surrounding the inner lumen (186) from the environment of the tubing unit, particularly for transporting heated Air.

Device for administering a respiratory gas, in particular for providing a high-flow therapy with a supply unit (1 10) for providing a respiratory gas for a patient, characterized in that a medical tube unit (120) according to claim 1 to the supply unit (1 10) is connected with its distal end, wherein the device is set up such that both in the inner lumen (186) and in the outer lumen (187) of the hose unit (120) a transport of breathing gas or

thermally insulating gas from the distal end to the proximal end of the

Hose unit out.

Apparatus according to claim 2, characterized in that the

Supply unit (1 10) an oxygen supply means (150) and an air supply means (152) and means (183) for mixing air and oxygen to provide a suitable breathing gas, wherein a breathing gas thus provided in the inner lumen (186) of the hose unit (120 ) is introduced.

Device according to one of the preceding claims 2 or 3, characterized in that an additional line (185) is provided, which is connected to the outer lumen (187) of the hose unit, and which is arranged such that air from the air supply device (152) in the outer lumen (187) is introduced.

Device according to one of the preceding claims 2 to 4, characterized by a heating unit (170) for heating by the

Oxygen supply device (150) provided oxygen and / or provided by the air supply device (152) air.

6. Device according to one of the preceding claims 2 to 5, characterized by a moistening unit (160) for moistening respiratory gas.

7. Device according to one of the preceding claims 2 to 6, characterized by at least one control valve (175, 176, 177) for controlling or regulating the composition and / or the flow of the respiratory gas in the inner lumen

(186) and / or the flow of air in the outer lumen or the

Additional line (185).

0

8. Device according to one of the preceding claims 2 to 7, characterized

characterized in that a distal end (120b) of the tube unit (120) is connected to the supply unit (110), and a proximal end (120a) of the tube unit (120) is connected to a nasal cannula (190).

5

9. Apparatus according to claim 8, characterized in that the outer lumen

(187) is formed at the proximal end (120a) of the hose unit (120) such that the air flowing through the outer lumen (187) is discharged to the environment.

Ό

10. The device according to claim 9, characterized in that the outer lumen (187) at the proximal end (120a) is formed with a sponge insert (195).