DE102012014141A1 - Device for detecting respiration activity of patient e.g. newborn child, has detecting unit comprising fluid chamber element with fluid space volume that is controlled by radially eccentric abdomen- and/or thorax movement - Google Patents

Abstract

The device (1) has a detecting unit (4) for detecting a start of an inspirational respiration activity and comprising a rectangular volume-variable fluid chamber element (5) with a fluid space volume (7) that is controlled by a radially eccentric abdomen- and/or thorax movement. The detecting unit is provided with a detection contact surface (9) in a region of the chamber element for ventral installation of the detecting unit in a region of the abdomen- and/or thorax of a patient (2). A sensor element measures volume of fluid (16) displaced out of the chamber element. Independent claims are also included for the following: (1) a method for detecting a respiration activity of a patient (2) a respirator for carrying out a synchronized artificial respiration and/or a resistive and resilient relief of a patient.

Description

The invention relates to a device for detecting a respiratory activity of a patient with a detection device for detecting at least one beginning of an inspiratory breathing activity.

Moreover, the invention relates to a method for detecting a respiratory activity of a patient, in which at least one onset of an inspiratory respiratory activity is detected by means of a volumetric flow.

The invention also relates to a ventilator for assisting a self-breathing of a patient, in particular for performing a synchronized breathing and / or a resistive and elastic relief of the patient, with a control and / or regulating device for controlling and / or regulating at least one machine-initiated inspiration.

Furthermore, the invention relates to a method for operating a ventilator.

Generic devices, respirators or related methods are well known in the art and are often used successfully in patients with respiratory disorders, especially in the context of ventilation therapy.

Respective respiratory disorders can be based on a wide variety of causes. For example, premature infants are often dependent on additional ventilation due to a lack of lung maturity, poorly developed respiratory muscles and / or not fully developed neural control in many cases.

The essential limiting factors for a sufficient respiratory mechanics with regard to a long-term self-breathing of affected children are often greatly increased airway resistance and / or a reduced lung compliance or compliance.

Especially in premature infants, it is usually not an increased resistance but a reduced compliance that is the predominantly pathologically changed parameter. In this case, the required inspiratory strain of the stiff lungs may require such high muscle power that rapid respiratory muscle fatigue sets in and, as a result, mechanical ventilation is required.

The aim of a ventilation therapy in this regard is, in any case, to mechanically ventilate the patients because of the side effects of ventilation until they can be weaned off from the corresponding mechanical ventilator due to their improved condition. If this is not possible to the required extent, a fan dependency arises, which can often lead to long-lasting mechanical ventilation. Such fan dependency is often associated with tracheal lesions, bronchopulmonary dysplasia and / or atrophy of the respiratory muscles, and particularly in premature infants with a lack of ability to learn physiological breathing.

In order to be able to reliably control or regulate mechanical ventilators or respirators in this regard, in particular also with regard to augmented spontaneous breathing, it is generally necessary to detect quantitative and reliable inspiratory and / or expiratory breathing activity of a patient to be assisted in breathing.

For example, for easier synchronized control of ventilation of a patient, it is often sufficient to record or detect a respiratory activity only qualitatively, for example, the detection of a start inspirative breathing activity is already sufficient for a ventilation process to ensure the synchronized control of ventilation reliable.

For this purpose, in the prior art, there are a number of devices with sensor devices by means of which an inhaled respiratory air volume flow, but also an exhaled respiratory air volume flow and / or only a respiratory air flow during breathing, can be detected and measured.

In certain groups of patients, for example premature babies, the use of such devices is not recommended, as a dead space volume added by the device to a respiratory system will not allow for adequate ventilation.

In addition, in intubated patients, especially in the category of newborns and premature babies, leakages on the tube can occur, which prevent reliable detection of the respiratory activity: in fact, such leaks lead to an erroneous determination of the volume flows and volumes supplied to the patient. As a result, an application of the resistive and elastic discharge in the form described in the prior art virtually impossible.

In addition, the resistive and elastic discharge in non-intubated, so non-invasively ventilated patients, for lack of sufficiently accurate or non-existent volume measurement also not be used.

This alone greatly increases the risk of inadequate self-breathing support, which can lead to complications, especially in the sensitive treatment of premature babies.

It is an object of the present invention in the field of respiration detection, in particular the control and / or regulation of ventilation, generic devices, ventilators and related methods further developed to avoid at least the disadvantages mentioned above.

The object of the invention is achieved according to a first aspect of a device for detecting a respiratory activity of a patient with a detecting device for detecting at least one onset of inspiratory breathing activity, wherein the detecting device according to the invention a variable volume fluid chamber element with a by a radially eccentric abdominal and / or Has thoracic movement influenceable volume of space.

Advantageously, in particular for supporting an augmented spontaneous breathing of a patient, especially a support of a self-breathing of a premature baby, an immediate measurement of the volume flow of the respiratory air or the respiratory air volume, in particular with the aid of an additional volume flow sensor, be dispensed with, since especially the beginning of an inspiratory breathing activity According to the invention can be detected only on a radially eccentric abdominal and / or thorax movement.

Advantageously, with the present invention constructively and procedurally, both a start and a course and an end of an inspirative as well as an expiratory breathing activity of a patient can be detected extremely easily.

As a result, a patient-synchronized control of ventilation is structurally very differently possible than previously customary, very simply.

Furthermore, in certain individuals or groups of patients, just as in premature infants, an application of a measuring device for determining the breathing air volume flow is not recommended, since the measuring device adversely adds a dead space volume to the actual ventilation system of the child, which altogether often makes adequate ventilation less reliable.

Especially in premature and / or newborn children, the movement of the abdomen is proportional to the self-breathing, as it is especially in premature babies and newborns so-called abdominal breathing. In mature individuals, the detection of the movement of both the thorax and the abdomen by means of the present device of the invention is usually required.

In addition, the object of the invention is also achieved by a method for detecting a respiratory activity of a patient, in which at least one beginning of an inspiratory breathing activity is detected by means of a volume flow, and wherein for generating a volume flow required in this regard, according to the invention, a volume of space of a variable volume fluid chamber element of a detection device is reduced by a radially eccentric abdominal and / or thorax movement.

According to the invention, the new process control, especially for a patient synchronized ventilation control, can completely dispense with all the disadvantages of measuring the actually inhaled and / or exhaled respiratory air volume flow.

In this way, in particular, the disadvantage can be avoided that falsifies the proportion of self-breathing with a critical leak on about a tube and the resulting leakage volume flows and under certain circumstances can not be compensated.

Overall, the teachings of the present invention leave so far embarked Löslege in supporting the self-breathing of a patient. Such prior art approaches have always required patient-synchronized ventilation control to measure an actual inhaled and / or exhaled airflow volume or actual volume of airflow to obtain information regarding respiratory activity of the patient.

It is advantageous if, in the region of the volume-changeable fluid chamber element, the detection device has a detection contact surface for the ventral application of the detection device in the region of the abdomen and / or in the region of the thorax of the patient. As a result, a particularly accurate detection of the respiratory activity of the patient can be ensured.

Furthermore, it is advantageous if, in the region of the volume-changeable fluid chamber element, the detection device has at least on its side facing the patient an at least partially flexibly configured detection contact surface. By means of the at least partially flexible designed detection contact surface, which is positioned ventrally on the patient, it is structurally extremely simple to be able to transmit even slightest radially eccentric abdominal and / or thorax movements to a sufficient extent on the variable volume fluid chamber element. Thus, for example, the beginning of inspiratory breathability can be detected extremely early, and self-breathing support can advantageously be initiated or started very early.

A preferred embodiment provides that the volume-changeable fluid chamber element comprises an elastically deformable tubular fluid-cushion part that automatically resets itself into an output fluid volume. In this way, it can be advantageously ensured that the volume-changeable fluid chamber element ideally always independently deforms back into its initial volume volume when the detection device is no longer tractioned by a radially eccentric abdominal and / or thorax movement. This is the case, for example, with expiratory breathability.

It is advantageous if the volume-changeable fluid chamber element is designed substantially rectangular, wherein the long side of the volume-changeable fluid chamber element is arranged transversely in a detection position with respect to the patient. In this way, a particularly sensitive responsive compression of the variable volume fluid chamber element can be achieved.

It is understood that, in particular, the volume-changeable fluid chamber element can alternatively also be shaped or designed differently.

The present device ideally encloses circularly the abdomen and / or thorax of the patient so that the volume-changeable fluid chamber element or the tube-shaped fluidic pad part can be well compressed by a radially eccentric abdominal and / or thorax movement.

In this respect, it is advantageous if the device comprises a fastening device which can be placed around the body of the patient, as it were, in continuation of the volume-changeable fluid chamber element.

Ideally, the device has a hook-and-loop fastener so that it can be quickly and easily adapted to different sized patients.

The volume-changeable fluid chamber element or in particular the fluid cushion part preferably consists at least of an air-filled hose element, which according to the invention is configured such that a radial eccentric movement of the enclosed body parts to a displacement of at least a portion of the air in the hose element by a discharge opening in the hose member leads. If the outflow port is also used as the air inflow port, the device can be further simplified.

Moreover, it is advantageous if the detection device cumulatively or alternatively has a return device for additional or alternative resetting of the variable fluid chamber element in a Ausgangsfluidraumvolumen, wherein the restoring device is disposed within and / or outside of the variable volume fluid chamber element. Such an additional restoring device is particularly advantageous if the actual material from which the volume-variable fluid chamber element is made, no sufficient or no permanently sufficient elastic properties inherent.

For example, within the volume-changeable fluid chamber element within the meaning of the invention, the restoring device can be provided structurally simply by intrinsically stiff fibers or by an elastic device with a honeycomb structure which always spread apart at least two oppositely disposed walls of the volume-changeable fluid chamber device if sufficient inspiratory respiratory activity is not present.

Outside the volume-changeable fluid chamber element, the restoring device can be provided structurally very simply, for example by means of an expansion tank element which can elastically expand in the case of a radially eccentric abdominal and / or thorax movement by a volume of fluid flowing out of the volume-changeable fluid chamber element. Upon completion of the radially eccentric abdominal and / or thorax movement and exhalation of the patient, it may contract due to its elastic properties and the previously displaced fluid volume flows back into the volume of the volume variable fluid chamber element.

A restoring device arranged outside the volume-changeable fluid chamber element can, for example, also be realized by elastic fibers, in particular glass fiber-reinforced elements, within wall regions of the volume-changeable fluid chamber element.

In order to be able to detect the fluid volume displaced from the volume of volume of the volume-changeable fluid chamber element with particular accuracy, it is advantageous if the detection device has a connection part for connecting a measuring device for measuring a volume of fluid displaced from the volume-changeable fluid chamber element during an inspiratory breathing operation. Thus, an amount of air flowing out of the fluid cushion part can be accurately detected. It is understood that advantageously not only the displaced fluid volume but also, for control purposes, for example, a fluid volume flowing into the volume-changeable fluid chamber element can advantageously be measured by means of the measuring device.

Such a measuring device may advantageously include immediately a pneumotachograph or spirograph, by means of which, for example, the respiratory rate of the patient can be determined.

The measuring device for measuring the volume of fluid displaced from the volume-changeable fluid chamber element can be provided in a constructively diverse manner. For example, it should be mentioned at this point that the measuring device can comprise a sensor which functions on the basis of the actual fluid volume flow, a differential pressure or an ultrasonic measurement.

An exceptionally advantageous and thus also preferred embodiment variant provides that the measuring device comprises a conventional sensor element of a ventilator or the like. By means of this conventional ventilator associated with the sensor element, the structure of the present device can be substantially simplified.

A conventional sensor element in this regard may be, for example, a flow sensor for determining an inhaled and / or exhaled respiratory air volume flow that was previously used, for example, in or on a respirator.

However, any other suitable sensor element may be used as long as it has sufficient measurement sensitivity.

In this respect, it is extremely advantageous if the detection device comprises a sensor element of a ventilator in order to measure a volume of fluid displaced from the volume-changeable fluid chamber element. Thus, the sensor element can advantageously be an integral part of the ventilator. In particular, this advantageously ensures that an otherwise problematic problem with regard to a dead space volume is excluded.

Advantageously, the external restoring device or the relevant expansion container element described above by way of example can also be connected to this connecting part described above.

A particularly fine-responding detection device can be provided if the connection part is arranged approximately in the middle of the volume-changeable fluid chamber element, since in the middle of the variable volume fluid chamber element, on the one hand, the largest volume of fluid chamber volume is present and on the other hand in a radially eccentric abdominal and / or thorax movement there volume variable Fluid chamber element is first compressed. In this respect, the first well-measurable fluid volume flow effects are also created there.

Advantageously, the variable volume fluid chamber element is thus either designed so that it even has a dynamic restoring force, which brings about the fluidic pad part in a declining movement in its original shape, in which case the previously displaced fluid volume flows back into the fluid core part. Or at the particular arranged on the detecting device measuring device for measuring the outflowing fluid volume is a reservoir element with well-defined compliance, for example in the form of the expansion tank element, so that by the radially eccentric movement of the enclosed body parts, the fluid volume through the measuring device for measuring the outflowing fluid volume into this In case of a retrograde movement, the corresponding fluid volume from the reservoir element flows in through the measuring device and flows again into the volume-changeable fluid chamber element or the fluid cushion part.

Moreover, it is advantageous if the device has a device for determining an inspiratory breathing air volume flow and / or an expiratory breathing air volume flow and / or a device for determining a breathing air volume of the patient. For this purpose, advantageously, the further above said conventional sensor elements are used.

Should the ventilation not only be synchronized in time with a self-breathing of the patient, but also about a synchronization in the depth of breath of the patient done, as for example in a resistive and elastic discharge, in which a respirator or a respirator to the patient Assisted by the intensity of his inspiratory efforts or his need for inspiration, a quantitative determination of the respiratory activity is required.

In the present case, this can be achieved particularly simply with the device for determining the inspiratory breathing air volume flow and / or the expiratory breathing air volume flow and / or with a device for determining a breathing air volume of the patient. For this purpose, basically any method known from the prior art can be used. In the present case, such a device will not be discussed in detail.

Known methods for the quantitative and / or qualitative determination of the respiration usually use the measurement of the inspiratory and / or expiratory breathing air volume flow to and from the lung. In particular, this measuring method is used when a respirator or respirator is to be controlled by means of the measuring devices. Patient-synchronized ventilation control requires no quantitative determination of respiratory activity in most established ventilation techniques. It is sufficient to detect or detect a start of the inspiration triggered by the patient and / or the detection or detection of an end of the patient's inspiration, as already described above. However, if the ventilation is not only synchronized with the self-breathing of the patient in time but, moreover, synchronization takes place in the patient's breathing depth, then this is done in the case of resistive and elastic discharge, then a quantitative determination of the respiratory activity is additionally required. In addition, advantageously, a method for the detection or detection of respiration and a method for the quantitative and / or qualitative determination of the respiration in a respirator or in a module of the respirator for monitoring the respiratory activity of a patient can be used.

In this respect, the present device also allows a quantitative detection of the respiratory activity of a patient, without having to introduce a previously required sensor or a sensor element in the respiratory air volume flow of the patient. Rather, the device according to the invention uses the movement of the abdomen and / or the thorax corresponding to the respiration.

In addition, with regard to a further preferred embodiment variant, it is advantageous if the present device has a device for matching a first value with respect to a fluid volume displaced from a volume-changeable fluid chamber element and a further value with respect to an actual respiratory air volume, in particular with regard to a quotient of an inhaled respiratory air volume and an exhaled respiratory air volume having.

As a result, in a particularly simple manner, for example after a corresponding calibration process, only the volume volume of a respiratory activity displaced by the volume-variable fluid chamber element can be deduced, whereby the present device itself responds to a patient by means of a ventilation method, such as a resistive and respiratory method elastic discharge, can be performed, which requires not only qualitative information but also quantitative information regarding respiration.

The qualitative information includes, for example, information regarding an envelope from inspiratory breathing to exhaled breathing, or vice versa; that is, in terms of a beginning and an end of inspirative or expiratory breathing.

The quantitative information includes, for example, information regarding an entire volume course of a respiratory cycle in terms of its magnitude.

Such a calibration or a related calibration can be done by means of a hardware-based device and / or a software-based device computer supported.

Although the present device is preferably used for the qualitative detection of the respiratory activity. In order to achieve a quantitative detection of the respiratory activity, an algorithm for calibrating the entire system is required in addition to the described device, in which the proportionality between the inhaled and / or exhaled air volume of the patient considered is determined. For this algorithm, a further device is required, with which the actual breathing air volume can be detected. This further device may be any device for measuring the volume of respiratory air described in the prior art.

The algorithm sets the displaced fluid volume of the detecting device of the device surrounding the patient circularly determined by the device in relation to the respiratory air volume measured by means of the device. By multiplying a respective quotient with the volume of fluid displaced from the volume-changeable fluid chamber element, the actual volume of respiratory air can be determined on the basis of the proportionality of the two volumes. In this respect, continuous measurement of the actual respiratory air values is no longer necessary for the permanent operation of a ventilator or a respirator.

Preferably, the measuring device described above and / or the device for balancing comprise an electronic unit, which ideally also allows to metrologically display the detected fluid volume flow, to integrate it into a volume and to apply arithmetic operations to the measured quantities.

In addition, in the present case it should be possible to visualize the detected or determined values visually on a monitor unit or to forward them to a controller of a ventilator or respirator. Thus, the ventilator can be adjusted to the needs of the patient particularly advantageous based on the visually displayed values.

In this context, it is advantageous if, in addition, a corresponding operating unit is provided, so that it is possible to manually perform a scaling of measured values, and to immediately display rescaled measured values on the monitor unit.

Alternatively, facilities required for this purpose can be integrated both in a monitor and in a respirator or in a respirator such that in particular the detection and / or determination of the flowing fluid volume takes place in the respirator or in the respirator or monitor unit.

According to a further aspect of the invention, the present object is also achieved by a method for operating a ventilator, in which the ventilator is calibrated prior to the application such that according to the invention quantitative data with quantitative information at least circumference of an actual air volume of the patient with qualitative data with qualitative Information comprising at least one beginning of an inspiratory breathing activity of the patient during the time-limited calibration are set in relation to each other such that the ventilator can later be operated solely on the basis of the determination of qualitative data, in particular of the device according to the invention.

According to another aspect of the invention, the present object is also achieved by a method for calibrating a ventilator in which the ventilator is calibrated by providing according to the invention quantitative data with quantitative information at least comprising an actual respiratory air volume of the patient with qualitative data containing qualitative information correlating a start of an inspiratory respiratory activity of the patient during the temporally limited calibration such that the ventilator can later be operated solely on the basis of the determination of qualitative data.

Advantageously, by means of the method according to the invention, ventilators or respirators known themselves can be operated much more simply in terms of process technology and, in particular, in terms of apparatus, than has hitherto been customary. Of particular importance beyond that after calibration in particular. it is possible to dispense with the permanent determination of an inhaled and / or exhaled respiratory air volume flow.

There is also provided, by way of example, an advantageous method for operating a respirator to assist a patient's own breath, particularly for performing synchronized breathing and / or resistive and elastic unloading of a patient, in which quantitative data including quantitative information includes at least the actual volume of respiratory air of the patient, which according to the invention is characterized in that qualitative data with qualitative information comprising at least one beginning of an inspiratory breathing activity of the patient by means of a fluid volume flow, which is displaced from a variable volume fluid chamber element of a detection device by the volume variable fluid chamber element by a radially exzehtrische Abdomen- and / or thoracic movement, it can be determined that the quantitative data and the qualitative data are stored during a z limited calibration are set in relation to each other in such a way that control and / or regulating signals for operating the ventilator are formulated, and that the control and regulating signals can only be generated on the basis of the qualitative data after completion of the calibration, so that the ventilator during self-respiratory support is controlled and / or regulated solely on the basis of qualitative data collection.

Namely, if the present device is connected to a ventilator or to a respirator which has an electrical or electronic control which is able to perform a synchronized ventilation and / or a resistive and elastic discharge, this can be done by means of the device certain control and / or control signal advantageously also be used directly for controlling or regulating the ventilator or the respirator.

In this respect, the invention is also solved by a ventilator for supporting a self-breathing of a patient, in particular for performing a synchronized ventilation and / or a resistive and elastic discharge with a control and / or regulating device for controlling and / or regulating at least one machine-initiated inspiration, wherein the ventilator is characterized by a device comprising one of the features described herein.

By using the device according to the invention in connection with a respirator, the structural complexity for determining required data for the permanent operation of the ventilator in various modes, which require quantitative information about a respiration of a patient, significantly reduced.

For synchronization, the controller of the ventilator can advantageously evaluate the signal course of the control and / or regulating signal generated by means of the device and in this case can start and / or end a mechanical inspiration on the basis of the signal curve.

In addition, if the invention is used, for example, for realizing a resistive and elastic discharge, the control and / or regulating signals generated by the present device or by the device for adjustment replace the respiratory airflow measurement required for the resistive and elastic discharge and / or resistive and elastic discharge required respiratory air volume flow measurement and / or respiratory air volume measurement.

The control of the resistive and elastic discharge then ideally takes place directly via the output signals generated by the present device.

It should be noted that this invention is suitable for both invasive use and non-invasive use.

Further advantages, objects and features of the present invention will be elucidated with reference to the attached drawings and the description which follows, in which an apparatus according to the invention is provided with a detecting device for detecting at least one start of an inspiratory breathing operation, wherein the detecting device comprises a volume-changeable fluid chamber element with a radially eccentric abdominal and / or thorax movement influencing volume, is shown and described.

In the drawing show:

1 schematically a cross-sectional view of a device with a detecting device, which has a variable volume fluid chamber element with an influenceable by a radially eccentric abdominal and / or thoracic space volume;

2 schematically a plan view of the device of the 1 ;

3 schematically a cross-sectional view of the device of the 1 and 2 during an inspirational breathing activity phase;

4 schematically another cross-sectional view of the device of the 1 to 3 during a reset phase of the variable fluid chamber element into an output fluid volume;

5 schematically another cross-sectional view of the device of the 1 to 4 with a restoring device in the form of an elastic reservoir element mounted outside the volume-changeable fluid chamber element; and

6 schematically a view of the device of the 1 to 5 ventilator to assist in self-breathing a premature baby.

The in the 1 to 6 shown device 1 for detecting a respiratory activity of a patient 2 (please refer 6 ) is in this embodiment part of a ventilator 3 (see also 6 ).

The device 1 is characterized in particular by a detection device 4 for detecting at least one onset of inspiratory respiratory activity of the patient 2 from, wherein the detecting device 4 for this purpose, a volume-changeable fluid chamber element 5 with one by a radially eccentric abdominal movement 6 influenceable fluid volume 7 having. Since it is the patient shown here 2 to a newborn Child, ie an abdominal breathe, acts, it is sufficient if by means of the device 1 the radially eccentric abdominal movement 6 is determined.

The detection device 4 points in the detection area 8th the volume changeable fluid chamber element 5 on the patient side, a detection contact surface 9 for central application of the detection device 4 in the abdomen area 10 of the patient 2 on.

The detection surface 9 This is so flexible that it already at the beginning of an inspirational breathing activity 11 (see arrows 3 ), thereby increasing the actual output fluid volume 15 (please refer 1 and 5 ) and thereby a fluid volume flow 16 over at least one opening 17 a connection part 18 the detection device 4 from the volume changeable fluid chamber element 5 can be displaced.

The volume changeable fluid chamber element 5 the detection device 4 is as a elastically deformable and in a Ausgangsfluidraumvolumen automatically resetting tubular Schlauchkissenteil 20 configured, wherein within the tubular Fluidkissenteils 20 or of the volume-changeable fluid chamber element 5 an elastic honeycomb structural element 21 is arranged, by means of which the volume variable fluid chamber element 5 into its output fluid volume 15 can be deferred, provided no inspirational breathing activity 11 is present or if the detection device 4 not by an inspirational breathing activity 11 of the patient 2 is charged.

The honeycomb structural element 21 is in this case within the volume-changeable fluid chamber element 5 arranged it between a top wall area 22 and an underside wall area 23 the tubular Fluidkissenteils 20 placed is placed. In this respect, the two wall areas 22 and 23 always through the honeycomb structural element 21 kept a minimum distance apart.

So that the detection device 4 easily on the patient 2 can be attached, the device 1 a corresponding fastening device 25 on which circular around the abdomen area 10 is looped around so that the detection device 4 ventral to the patient 2 can be arranged safely.

At the connection part 18 is a measuring device 26 exemplified in the form of a pneumotachograph, PNT, attached, on which on the one hand pressure hoses 27 can be connected to a flow measurement in terms of fluid volume flow 16 via a differential pressure also on the ventilator 3 make and / or transmit.

It is understood that in other embodiments, alternative signal transmissions can be used. For example, the determined differential pressure as electrical signals by means of a corresponding electrical wiring to the ventilator 3 be transmitted.

At this point, it should again be noted that the measuring device 26 Alternatively or cumulatively, a sensor element (not shown here) of the ventilator 3 may advantageously comprise, as already described above.

By means of the pressure hoses 27 is the device 1 to the ventilator 3 connected, the ventilator 3 the determined values of the flow measurement with respect to the volume changeable fluid chamber element 5 displaced fluid volume 1 for its control according to the invention can use. This includes the ventilator 3 a corresponding evaluation not shown here in detail 28 ,

In addition, there are breathing tubes 30 on the ventilator 3 connected, at their ends facing the patient 31 a respiratory mask 32 is arranged to ventilate the patient. The ventilation mask 32 is here by means of a front holder 33 at the head 34 of the patient 2 secured captive or slip-proof.

As shown 5 is on the top side of the measuring device 26 another external reset device 35 in the form of an elastic reservoir element 36 arranged to a provision of the volume variable fluid chamber element 5 into its output fluid volume 15 to be able to support.

Advantageously, the ventilator 3 solely on the basis of the radially eccentric abdominal movement 6 displaced fluid volume 16 be controlled, so that a determination of the actual breathing air volume of the patient 2 during ventilation is no longer required.

In addition, the ventilator has 3 via a display unit 40 for visualizing fluid volume flows, the actual and / or extra-calculated respiratory air volume flows and / or the actual volume of respiratory air.

It is understood that the exemplary embodiment explained above is only a first embodiment of the device according to the invention. In this respect, the possible scope of the invention is limited. not on this embodiment.

All disclosed in the application documents features are claimed as essential to the invention, provided they are new individually or in combination over the prior art.

LIST OF REFERENCE NUMBERS

1

Device for detecting a breathing activity

2

patient

3

ventilator

4

detection

5

volume changeable fluid chamber element

6

radially eccentric abdominal movement

7

Fluid volume

8th

detection range

9

Detection contact surface

10

abdomen

11

inspirational breathing activity

15

Starting fluid volume

16

fluid volume

17

at least one opening

18

connector

20

Fluid pad member

21

Honeycomb element

22

top wall area

23

underside wall area

25

fastening device

26

measuring device

27

pressure hoses

28

evaluation

30

breathing tubes

31

end up

32

breathing mask

33

end bracket

34

head

35

Reset device

36

elastic reservoir element

40

display unit

Claims (13)

Contraption ( 1 ) for detecting a respiratory activity of a patient ( 2 ) with a detection device ( 4 ) for detecting at least one start of an inspiratory breathing activity, characterized in that the detection device ( 4 ) a volume changeable fluid chamber element ( 5 ) with a by a radially eccentric abdominal and / or thorax movement ( 6 ) influenceable fluid volume volume ( 7 ) having. Contraption ( 1 ) according to claim 1, characterized in that the detection device ( 4 ) in the region of the volume-changeable fluid chamber element ( 5 ) a detection contact surface ( 9 ) for the ventral application of the detection device ( 4 ) in the area ( 10 ) of the abdomen and / or thorax of the patient ( 2 ) having. Contraption ( 1 ) according to claim 1 or 2, characterized in that the detection device ( 4 ) in the area ( 8th ) of the volume changeable fluid chamber element ( 5 ) at least on the patient ( 2 ) side facing an at least partially flexible designed detection contact surface ( 9 ) having. Contraption ( 1 ) according to one of claims 1 to 3, characterized in that the volume-variable fluid chamber element ( 5 ) an elastically deformable and in a Ausgangsfluidraumvolumen ( 15 ) self-resetting tubular fluid cushion part ( 20 ). Contraption ( 1 ) according to one of claims 1 to 4, characterized in that the volume-variable fluid chamber element ( 5 ) is designed substantially rectangular, wherein the long side of the variable volume fluid chamber element ( 5 ) is arranged transversely in a detection position with respect to the patient. Contraption ( 1 ) according to one of claims 1 to 5, characterized in that the detection device ( 4 ) a reset device ( 35 ) for additional or alternative resetting of the variable fluid chamber element ( 5 ) into an output fluid volume ( 15 ), wherein the resetting device ( 35 ) within and / or outside the volume variable fluid chamber element ( 5 ) is arranged. Contraption ( 1 ) according to one of claims 1 to 6, characterized in that the detection device ( 4 ) a connection part ( 18 ) for connecting a measuring device ( 26 ) for measuring a variable volume fluid chamber element ( 5 ) displaced fluid volume ( 16 ) during an inspiratory respiratory activity, wherein in particular the connection part approximately in the center of the volume-variable fluid chamber element ( 5 ) is arranged. Contraption ( 1 ) according to one of claims 1 to 7, characterized in that the detection device ( 4 ) a sensor element of a ventilator ( 3 ) from the volume changeable fluid chamber element ( 5 ) displaced fluid volume ( 16 ) to eat. Contraption ( 1 ) according to one of claims 1 to 8, characterized by a device for determining an inspiratory breathing air volume flow and / or an expiratory Respiratory air volume flow and / or a device for determining a respiratory air volume of the patient ( 2 ). Contraption ( 1 ) according to one of claims 1 to 9, characterized by a device ( 28 ) for balancing a first value with respect to one of a volume changeable fluid chamber element ( 5 ) displaced fluid volume ( 16 ) and a further value with respect to an actual breathing air volume, in particular with regard to a quotient of an inhaled respiratory air volume and an exhaled respiratory air volume. Method for detecting a respiratory activity of a patient ( 2 ), in which at least one beginning of an inspiratory respiratory activity is detected by means of a volumetric flow, characterized in that in order to generate a volumetric flow required in this regard ( 16 ) a volume of space ( 7 ) of a volume-changeable fluid chamber element ( 5 ) a detection device ( 4 ) by a radially eccentric abdominal and / or thorax movement ( 6 ) is at least reduced. Ventilator ( 3 ) for assisting a patient's own breath ( 2 ), in particular for performing a synchronized ventilation and / or a resistive and elastic discharge of the patient, with a control and / or regulating device for controlling and / or regulating at least one machine-initiated inspiration, characterized by a device ( 1 ) according to one of claims 1 to 10. Method for operating a ventilator ( 3 ), in which the ventilator ( 3 ) is calibrated in such a way that quantitative data with quantitative information at least circumference of an actual breathing air volume of the patient ( 2 ) with qualitative data containing qualitative information comprising at least one onset of inspirational respiratory activity of the patient ( 2 ) are correlated with each other during the time-limited calibration in such a way that the ventilator ( 3 ) can later be operated solely on the basis of the determination of qualitative data.

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