Pressure wave device and method for treating human or animal body

Abstract

The invention relates to a pressure wave device for treating a human or animal body, comprising: a pneumatic drive for generating a pressure wave coupled into the human or animal body; at least one compressor for generating a source gas; and a handpiece into which the source gas can be introduced and by means of which a pressure wave is generated, and a pressure regulating device for setting a pressure wave generating pressure for generating the pressure wave, at least one compressor for generating the source gas being able to be set in stages to at least two power levels, and the pressure regulating device regulates the pressure wave generating pressure by regulating the source gas pressure at each power level. Each power level is preferably determined by a range of frequencies at which a pressure wave produces a pressure value and at which the pressure wave is activated. The power level is preferably selected by means of a table in which a respective range of pressure wave generation pressure values and frequencies are stored.

Description

[0001] This application is a divisional application of the patent application with application number 201980085056.2 (international application number PCT / EP2019 / 085333), application date December 16, 2019, and invention name “Pressure wave device and method for treating human or animal body”. Technical Field

[0002] The invention relates to a pressure wave device for treating the human or animal body, the pressure wave device having a pneumatic drive for generating pressure waves which are coupled into the human or animal body, and a method for treating the human or animal body with pressure waves using the pressure wave device described herein. Background Art

[0003] Pressure wave devices for treating the human or animal body by means of pressure waves are known per se, wherein the mutual impact of accelerated impact elements on an impact body generates the pressure waves.

[0004] For example, a pressure wave device for treating a human or animal body is known from EP 2 529 792 or EP 2 381 864 B1. The pressure wave device has a pneumatic drive for generating pressure waves. The pressure wave is generated by a pneumatically accelerated impact component and impacts a transmission element, which couples the pressure wave into the body through contact. Therefore, the pressure wave device has a compressor as part of the pneumatic drive for generating a source gas, wherein the compressor has a compressor motor. The pressure wave device has a device for setting the pressure generated by the pressure wave, for example by means of the rotational speed of the compressor motor, i.e., a device for setting the pressure of the accelerated gas. In the pressure wave device of EP 2 381 864 B1, the compressor works continuously at different powers in order to be able to provide adjustable pressure waves of different intensities in the handpiece, which can cause premature wear of the compressor and is accompanied by noise scenes of different sizes.

[0005] It is known that in pressure wave devices, a compressor is controlled as a function of the gas pressure to be generated for the pressure waves. In this case, the compressor is usually operated until a preset maximum source gas pressure value is reached, which in some variants is stored in a pressure reservoir. After the source gas pressure value is reached, the compressor is usually switched off in order to be able to counteract the generation of an overpressure. This has the effect that during the treatment, the compressor constantly restarts its operation, thereby generating a background noise scene that is sometimes louder and sometimes quieter. This again has the effect that the patient actively perceives this and feels disturbed by the background noise scene during the treatment. The compressor also wears out relatively quickly.

[0006] It is desirable in a pressure wave device that it provides a constant pressure in the handpiece within a certain time period, in particular in the area of ​​different flow rates, which pressure can be set by the user as required. In particular, it is desirable that the pressure wave device or the pneumatic drive provide a constant pressure for a range of flow rates, which is determined by the switching frequency of the corresponding valve, for example the solenoid valve of the handpiece. This is the power range or load range. The same applies to the varying pressure in the case of a fixed switching frequency or a combination of both settings. It is also desirable that the acoustic background scene of the pressure wave device is minimized or constant during its operation, thereby improving the health of the human or animal patient, because the patient's perception of the noise scene becomes insignificant if the noise scene is monotonous. Finally, the service life of the compressor will be extended. Summary of the invention

[0007] In view of these problems existing in the prior art, the object of the present invention is to provide a pressure wave device in which the background noise during operation of the pressure wave device is reduced or always slightly perceptible, regardless of the load that the pressure wave device is applying. The load is essentially related to the frequency of the pressure wave device, i.e. the switching frequency at which the valves of the handpiece are operated (air volume) and to the pressure used to operate the pressure wave device (the speed available for the impact part to be accelerated). In addition, it is an object of the present invention to provide a pressure wave device that provides a regulated or adjustable, in particular variable, constant pressure.

[0008] This object is achieved by means of a pressure wave device according to claim 1 and a method for treating the human or animal body by means of pressure waves according to claim 11. Further advantages and features of the invention are given in the dependent claims.

[0009] According to the present invention, a pressure wave device for treating a human or animal body comprises a pneumatic drive device for generating pressure waves that are coupled into the human or animal body. In addition, the pressure wave device comprises at least one compressor for generating a source gas (or Quellgas) having at least two settable power levels and a handpiece, wherein the source gas can be introduced into the handpiece via a connecting pipeline, and the impact component can be accelerated by means of the handpiece so as to couple the pressure wave into the human or animal body. In addition, the pressure wave device comprises a pressure regulating device for setting the source gas pressure to a pressure wave generating pressure for generating the pressure wave. The pressure wave generating pressure is the pressure that directly acts on the impact site.

[0010] The pressure wave device comprises a hand piece and a pressure regulating device, into which a source gas can be introduced and by means of which a pressure wave is generated, wherein the pressure regulating device is used to set a pressure wave generating pressure for generating the pressure wave, wherein in particular at least one compressor of a compressor system for generating the source gas can be set in stages to at least two power levels, each power level being adjusted by a pressure wave generating pressure value (P D_Bi ) and frequency (f Bi ) range, and the pressure regulating device is adjusted at each power level L i The source gas pressure (P s_i ) to adjust the pressure wave generating pressure (P D_i ).

[0011] According to the invention, the pressure wave device has at least one compressor system, which can be operated in stages in different operating states to generate different power levels. If the pressure regulating device is no longer able to set the source gas pressure to the pressure wave generation pressure and / or set the desired flow rate, that is, to repeatedly accelerate the frequency of the valve opening of the impact component to provide the pressure wave device with the required pressure wave generation pressure and / or the required flow rate, the selection of different power levels can be performed by presetting according to the set operating parameters of the pressure wave device (pressure wave generation pressure and frequency range), or the power level can be automatically changed by the pressure wave device.

[0012] In other words: the pressure wave device according to the present invention has a compressor system, which can be operated in different operating states in a staged manner to produce different power levels, wherein the pressure regulating device sets, especially reduces the pressure wave generating pressure by adjusting the first source gas pressure within a first power level, that is, setting the source gas pressure within a first specific flow rate range, and wherein once the pressure regulating device can no longer provide the required pressure wave generating pressure and / or the required flow rate, the pressure regulating device switches the compressor system to a second operating state with a second power level in order to set, especially reduce, the pressure wave generating pressure.

[0013] The pressure wave generating pressure is the pressure by which the impact component of the pressure wave device is accelerated. The flow rate is the frequency at which the valve on the handpiece of the pressure wave device is opened, that is, the number of pressure waves generated per unit time. The specific power range consists of the desired pressure wave generating pressure at a specific flow rate. The higher the desired pressure wave generating pressure within a specific power range, the lower the flow rate, and vice versa. In addition, within a specific power range, there is a maximum first pressure wave generating pressure at a minimum flow rate, and there is a maximum flow rate at a minimum pressure wave generating pressure. Therefore, if a pressure wave generating pressure exceeding the maximum in the specific power level is to be generated, or if a flow rate exceeding the maximum in the specific power level is to be achieved, the power level is automatically changed by the pressure wave device.

[0014] Each power level (L i ) generates pressure value (P) through pressure wave D_Bi ) and the frequency of the activation pressure wave (f Bi ) range. The power level (L i ), in which the table stores the pressure values ​​(P D_Bi ) and the frequency of the activation pressure wave (f Bi ).

[0015] The pressure regulating device is configured to set different pressure wave generating pressures P D To this end, for example, directly in front of or at the inlet of the handpiece, a pressure regulator for adjusting the source gas pressure, in particular for providing a substantially constant, predetermined pressure wave generating pressure P D The pressure regulating device is arranged in the handpiece. In other words: during the separately controllable operating state of one and / or more compressors, certain power levels are covered at a constant rotational speed, wherein the current source gas pressure is subject to operation-related or load-related fluctuations, for example, and it is proposed to set the pressure wave generation pressure at a constant rotational speed by means of the pressure regulating device. Preferably, the compressor system is designed so that the separately settable power levels do not overlap. The compressor system can, for example, consist of a single compressor or a plurality of compressors.

[0016] It is also conceivable to arrange the pressure regulating device in the pneumatic drive or at any position in the connecting line. At present, the term "substantially constant pressure wave generating pressure" is to be understood as a gas pressure which is substantially constant with respect to the predetermined pressure wave generating pressure P D, i.e. the preset desired value for the gas pressure of the pressure wave to be generated deviates by at most ±0 to 0.5 bar. Preferably, the pressure regulating device is designed so that the deviation from the desired pressure wave generating pressure, i.e. the setting accuracy of the pressure wave generating pressure, is always less than 0.2 bar, preferably less than 0.15 bar and particularly preferably less than 0.1 bar. This makes it possible to achieve the setting accuracy required for the operationally safe use of the pressure wave device.

[0017] The same applies in a meaningful manner to the corresponding flow velocities which must be available at certain pressure wave generating pressure values.

[0018] Preferably, the compressor system comprises a plurality of compressors, between which switching is performed, for example, to set a desired power level. In other words: the individual compressors are not operated in a specific operating state to manipulate or determine the source gas pressure range, but rather switching is performed between the following compressors (or the following compressors are switched on individually), which are respectively responsible for producing a single operating state with a corresponding power level. According to the invention, the corresponding power level is defined from the operating parameters pressure and frequency (flow rate) of the pressure wave device, which operating parameters determine the consumption on the pneumatic mechanism of the pressure wave device (amount of air per unit time).

[0019] The pressure regulating device can set a preset pressure wave generating pressure P D , for example before the gas pressure is conducted into the handpiece, in order to accelerate the impact component there and generate a pressure wave. This has the advantage that a pressure wave generating pressure range can be provided for a specific power level, for example a specific flow rate range, more precisely, regardless of the switching frequency of the valve, for example a solenoid valve, used specifically, i.e. in the handpiece, regardless of the activation duration of the pressure wave generating pressure and / or regardless of the compressor power of the compressor or the source gas pressure currently induced by one or more compressors.

[0020] In addition, one or more corresponding compressors for generating the source gas pressure can be operated continuously in a specific power range, preferably during treatment, so that a monotonous background noise scene can be heard. In addition, the operating state of the compressor can be selected so that a particularly favorable noise scene is formed. In particular, only those rotation speeds can be selected at which strong vibrations or resonances do not occur. In the case of a discretely settable rotation speed, the vibration of the pressure generating device can be suppressed in a targeted manner by structural measures. Here, the rotation speed of one or more compressors is essentially determined by its voltage or operating voltage, which can be set discretely. It is also conceivable that the electrical controller fixes the rotation speed of the compressor to one of a plurality of fixedly preselected values. The discrete power level of one or more compressors is associated with the fixed rotation speed of one or more compressors.

[0021] In particular, the subjective perceptibility of the background noise scene can be reduced during operation of the pressure wave device, which in turn can improve the patient's well-being during treatment. Due to the constant speed, this is less stressed than with repeated switching on / off or repeated changes in speed. In other words: one or more compressors are operated at a fixed speed at a fixed voltage, and load differences (pressure and flow rate) only lead to different current consumption of the motor.

[0022] Preferably, the pressure regulating device has a discharge valve, which in particular has a valve, in particular a solenoid valve. For example, the pressure regulating device comprises a proportional valve. The proportional valve allows, for example, a stable or continuous switch between a fully open and a fully closed state. This can be, for example, an electromagnetically controlled or medium-controlled proportional valve.

[0023] The pressure regulating device is advantageously used to provide a constant pressure on or in the handpiece, namely a pressure wave generating pressure P for generating the pressure waves. D , so that uniform pressure waves can be introduced into the body to be treated via the handpiece.

[0024] In general, a pressure reducer is understood to be a pressure valve for installation in a hose or pipe system, wherein the pressure on the input side corresponds to the source gas pressure P s The pressure (input pressure) is different, but the pressure valve ensures that, on the output side currently introduced into the handpiece, a specific output pressure is not exceeded, which currently corresponds to the pressure wave generation pressure P D By providing a pressure regulating device, the source gas pressure P s is converted into the pressure wave generating pressure P required for generating the pressure wave D Therefore, the advantage of the pressure reducer is that it can generate a uniform pressure wave in the pressure wave device.

[0025] According to one embodiment of the pressure wave device, the pressure regulating device has at least one pressure sensor for determining the pressure wave generating pressure P D . It is thus possible to check in a simple manner whether the pressure regulating device has carried out a corresponding regulation, in particular a pressure reduction. Preferably, the pressure regulating device is designed as a control circuit. It is conceivable that a further pressure sensor is provided. By providing a further pressure sensor, the gas pressure, i.e. the source gas pressure, can be detected for checking, in particular before entering the handpiece. The pressure P is generated based on the detected source gas pressure and / or based on the detected pressure wave D -- Depending on the position at which the at least one pressure sensor is arranged -- it is possible to set the pressure wave generating pressure P which is stored in particular in the controller D .

[0026] In particular, it is proposed that the compressor system is controlled or configured such that the discrete power levels always provide a source gas pressure that can be reduced to a desired pressure wave generating pressure, in order to ensure that this is provided reliably on the handpiece and independently of the switching frequency of the pressure wave generating pressure. In other words, it is avoided that the provided source gas pressure is insufficient to always achieve the desired pressure wave generating pressure, i.e., the pressure wave generating pressure within the flow rate range.

[0027] According to one embodiment of the pressure wave device, in relation to the power level L i The controller (where i≥1) stores a predetermined range of pressure wave generation pressure values ​​P D_i and a predetermined range of switching frequency f i , where i≥1, i.e., a pressure table, wherein the pressure regulating device is configured to generate a pressure P according to a desired pressure wave D_i , for example, for a desired range of switching frequencies f i , set the required power level L of the compressor system i .

[0028] As proposed herein, a first source gas pressure P is first generated within a specific power level by means of one or more compressors. s_i , where i ≥ 1, the source gas pressure can then in particular be detected by a pressure sensor. The detected source gas pressure P s_i Capable of generating pressure P with a preset or desired pressure wave D_i The pressure wave generating pressure is stored in the controller. In this case, in particular at a preset frequency of the pressure wave device, that is, at a time-dependent number of strokes of the impact component, each source gas pressure value P s_i With a certain range of pressure waves to generate pressure P D_iThe pressure wave is associated with the pressure wave generator to generate a pressure wave. This association is carried out in particular as a function of the frequency set on the pressure wave device. The pressure wave generates a pressure P D_i Therefore, it is variable, wherein variable should be understood as: according to the maximum source gas pressure value P s_i The specific preset, especially set source gas pressure range or load range can set the desired pressure wave generation pressure P D_i The pressure wave generating pressure is within a specific range of preset and expected pressure wave generating pressure P D_i are associated with each other and have another maximum source gas pressure value P s_i±1 Another specific source gas pressure range or load range and another range of pressure wave generating pressure P D_i±1 Associated.

[0029] According to a specific, graded preset load range or power level L i , with the help of the pressure regulating device, the desired pressure wave is generated at a specific flow rate. D_i Or another desired pressure wave generating pressure P D_i±1 Set to another power level L i±1 This has the advantage that during the treatment the pressure P can be generated with the aid of the desired pressure wave. D_i Generate a uniform pressure wave, namely by means of step-controllable, discrete power levels L i A uniform pressure wave is generated. The compressor or compressors thus work in discrete stages.

[0030] Preferably, the pressure wave device has at least two compressors. Each of the at least two compressors can be operated at the same or different rotational speed levels, in particular at different power levels. The compressors can therefore be operated at different, in particular discrete power levels. Currently, discrete power levels can be achieved at a preset source gas pressure and a preset flow rate. The at least two compressors can in particular achieve: reducing the noise of the pressure wave device, i.e. the background noise scene, in particular when the pressure wave device is used in the range of low flow rates and / or at low source gas pressures. Because in order to generate a specific source gas pressure P s_i For example, two or more compressors can be used, each of which is operated at a lower power.

[0031] Preferably, at least two compressors are connected to one or each compressor motor for controlling the compressor. The compressor or each compressor can thus be controlled by the respective motor at a preset power or a preset frequency, whereby a predetermined power level can be set at the respective compressor. This advantageously reduces the changing noise of the pressure wave device and reduces wear due to constant operation.

[0032] According to a preferred embodiment of the pressure wave device, a cold trap for collecting cooled, condensed source gas is provided, in particular between the at least one compressor and the pressure regulating device. Condensed gas, in particular condensed air, can thus be collected by the cold trap. It is thus possible to prevent condensed gas, i.e. liquid, from being introduced into the handpiece. Thus, only source gas is introduced into the handpiece. It is thus possible to avoid moisture deposits in the handpiece, which can lead to, for example, mold formation, corrosion, etc., for a long time.

[0033] More preferably, an overpressure valve for removing the overpressure of the source gas is provided, in particular between one or more compressors and the pressure regulating device. This makes it possible to avoid that the pressure wave device is damaged or even destroyed by the overpressure generated. In particular, an overpressure valve is used at gas pressures of more than 5 bar, preferably at pressures of up to 25 bar.

[0034] Preferably, each compressor is configured to generate different, especially discrete volume flows in stages, so that different source gas pressures and / or flow rates of the source gas can be generated. Therefore, each compressor can be set or adjusted with respect to its compressor power so that each compressor can generate different volume flows in stages, and thus can generate different source gas pressures and / or flow rates of the source gas. Therefore, the compressor power is used to generate source gas at a staged, i.e. discrete, rotation speed of the compressor motor. Preferably, each compressor has its own compressor motor. In particular, each compressor has a direct current motor (DC motor). Therefore, each compressor can operate at a fixed rotation speed (i.e. a fixed preset voltage), but has different current consumptions at different pressure values ​​and / or at different flow rates within a power level. This has the following advantages: the background noise of the pressure wave device can be reduced as a whole.

[0035] According to a preferred embodiment of the pressure wave device, the pressure wave device is configured so that the pressure wave device can be exhausted by means of a controllable exhaust valve, in particular a solenoid valve, after one, in particular each use of the pressure wave device. The source gas remaining in the circulation circuit of the pressure wave device can be removed from the circulation circuit in an advantageous manner via the exhaust valve. The exhaust valve preferably works autonomously. However, it is conceivable that the exhaust valve can be additionally controlled by a controller. In particular, such an exhaust valve can prevent the source gas from being deposited for a long time and possibly condensing in the circulation circuit or the pressure wave device. The growth of bacteria and the like can thus be counteracted in a simple manner.

[0036] Another aspect of the invention relates to a method for treating the human or animal body by means of pressure waves, in particular generating the pressure waves by means of a pressure wave device as described herein, wherein the method comprises the following steps:

[0037] - switching on at least one compressor to produce a source gas,

[0038] - conducting the source gas from the compressor to the handpiece, wherein at least one compressor is set to a discretely controllable operating state, and a discrete power level L is associated with the operating state, - wherein the pressure is regulated by the pressure regulating device within the power level L by adjusting the pressure of the first source gas at a specific frequency to generate pressure,

[0039] - and wherein the pressure wave generating pressure is adjusted by increasing or decreasing the power level L.

[0040] By switching on one or more compressors, a first pressure P of the source gas pressure can be set within discrete power levels L. s_i , where i ≥ 1. At a specific flow rate or frequency f i Under the specific discrete power level L i The associated possible preset or desired pressure wave generates a pressure P D_i , where i ≥ 1, can be stored in the controller and can be displayed to the user when the pressure wave device is switched on for individual selection. It is also possible that the user manually inputs a preset pressure wave generation pressure P D_i In this case, it is possible to firstly i The first source gas pressure P is generated under s_i The first source gas pressure can be reduced to a first pressure wave generating pressure P by means of a pressure regulating device. D_i The set pressure wave generates pressure P D_i It can then flow to the inlet of the handpiece.

[0041] During the flow of the source gas to the handpiece, the gas pressure is detected by a pressure sensor. Depending on the position of the pressure sensor, the pressure sensor detects the source gas pressure (before passing through the pressure regulating device) or the pressure wave generation pressure (after passing through the pressure regulating device), or both pressures are measured by means of two sensors. Depending on the arrangement of at least one pressure sensor, the source gas pressure P is thus detected. s_i Or pressure wave produces pressure P D_i According to the detected source gas pressure P s_i Or pressure wave produces pressure P D_i To control the pressure regulating device. Therefore, on the one hand, a constant pressure wave generating pressure P is always provided for the handpiece. D_i , so that a uniform pressure wave can be generated at the end of the handpiece for transmission into the human or animal body, and on the other hand one or more compressors are not always under full load, but only generate pressure P at the required pressure wave D_i The range falls within which the power level L i Constant work.

[0042] Preferably, the method further comprises the following steps:

[0043] - Close the exhaust valve, and / or

[0044] - at least partially opening or at least partially closing or regulating a pressure regulating device for conducting the source gas from the compressor to the handpiece.

[0045] In one step, the exhaust valve is closed in order to prevent source gas, in particular generated in at least one compressor, from escaping from the pressure wave device, the source gas being provided for generating the pressure wave, ie the source gas pressure P s_i , where i≥1. In addition, the pressure regulating device can be at least partially opened or partially closed, so that the source gas generated after the pressure is reduced or increased, and the pressure wave generates a pressure P D_i , able to flow to the handpiece.

[0046] Preferably, after the actual generated pressure wave generation pressure is detected, it is checked whether the detected pressure wave generation pressure corresponds to the desired or predetermined pressure wave generation pressure, and based on the difference between the detected pressure wave generation pressure and the desired pressure wave generation pressure

[0047] a) maintaining the state of the pressure regulating device unchanged as long as the difference is approximately zero;

[0048] b) the pressure regulating device at least partially opens or reduces the source gas pressure Ps_i , as long as the difference is positive, meaning that the detected pressure wave generation pressure is higher than the expected pressure wave generation pressure, and

[0049] c) the pressure regulating device at least partially closes or increases the source gas pressure P s_i , as long as the difference is negative, it means that the detected pressure wave generation pressure is lower than the expected pressure wave generation pressure.

[0050] At present, depending on the evaluation of the difference between the detected pressure wave generating pressure and the desired pressure wave generating pressure, the source gas pressure P is increased, decreased or maintained. s_i The detected pressure wave generates a pressure P D_i From the source gas pressure P generated at at least one compressor s_i Each pressure wave generates pressure P D_i Here and the power level L i Associated, ie associated with, a constant rotational speed range of the one or more compressors.

[0051] If the pressure P is generated when the pressure wave is detected D_i When the pressure wave generates a pressure higher than the desired pressure, the preset pressure wave generates a pressure P D_i , the pressure regulating device is at least partially opened or further opened to discharge the source gas, whereby the pressure wave generates a pressure P D_i If the pressure wave is detected, the pressure P D_i Lower than the expected pressure wave pressure P D_i , the pressure regulating device is at least partially closed or further closed to generate a higher pressure wave generating pressure P D_i If the pressure wave is detected to generate pressure P D_i Basically equal to the desired pressure wave generating pressure P D_i , the state of the pressure regulating device remains unchanged.

[0052] By opening or closing the pressure regulating device, in particular the proportional valve, it is thus possible to set only the desired pressure wave generating pressure P D_i , wherein opening or closing the pressure regulating device does not presuppose that the source gas pressure P generated by at least one compressor must be changed s_i However, the source gas pressure P can be changed when necessary. s_i , in particular by setting at least one compressor to another power level. If the difference is so large that only when setting another (higher or lower) level of source gas pressure P s_i The desired pressure wave generation pressure P can be achieved only when D_i, then a "demand" is generated. The same applies similarly when the flow rate changes.

[0053] At present, the term "substantially equal to" or the term "difference is approximately zero" is understood to mean that the following pressure wave generates a pressure P D_i The pressure wave generates a pressure that is different from the preset pressure wave generating pressure P D_i Deviations up to ±0 to 0.5 bar, i.e. pressure P generated by the pressure wave D_i The preset desired value of can deviate by at most ±0 to 0.5 bar. In the controller, for example, the source gas pressure P s_i In particular, a pressure wave with a certain range of adjustable frequencies is stored to generate a pressure P D_i The source gas pressure P to be generated is thus achieved in a simple manner s_i The hierarchical model.

[0054] The "opening" or "closing" of the pressure regulating device is explained here only as an example. It is conceivable that the pressure regulating device works in exactly the opposite direction, so that opening or closing the pressure regulating device causes exactly the opposite effect as described here. "Opening" / "closing" also includes other rules for setting the pressure.

[0055] Preferably, if for a specific power level L i-1 The maximum source gas pressure applicable is P s_(i-1) ≤P D_i , or for the desired or required pressure wave generating pressure P D_i ≤P s_(i-1) , at least one power level is increased or decreased in stages, wherein in order to increase or decrease the power level, the compressor speed is adjusted and / or additional compressors are added or individual compressors are turned off. It is conceivable that the possible pressure wave generation pressure P is stored in the controller D The range of at a specific flow rate or frequency f or for a specific frequency range can be associated in order to be able to define the power level L. In addition, the voltage U to be set can be stored in the controller, at which at least one compressor must be operated in order to be able to achieve the desired source gas pressure P at the set power level. s , so that the desired pressure wave generation pressure P can be achieved at the desired frequency D. In particular, the voltage at the compressor can be selected for a pair consisting of a pressure wave generation pressure and a frequency selected by a user. For example, it is conceivable that the control device automatically sets a voltage at the compressor as a function of the desired pressure wave generation pressure and the set frequency input by the user at the man-machine interface, the voltage resulting in a power range that also includes the desired pressure wave generation pressure. It is therefore advantageously possible to select an operating state for the compressor that is particularly advantageous for low-wear and low-noise scenarios, since at a fixed voltage one or more compressors always operate at a constant speed within a power level L. It is also conceivable in particular that the compressor is correspondingly optimized for a discretely controllable voltage or is designed to ensure relatively quiet operation and a long service life.

[0056] It is further preferred that in the proposed method, the setting of the preset pressure wave generating pressure can be changed, in particular during the treatment. If, for example, the preset pressure wave generating pressure is changed during the treatment, the pressure regulating device is further opened or further closed when the pressure wave generating pressure adapted to the changed pressure is exceeded or fallen below. The pressure regulating device is thus actuated as a function of the detected pressure of the source gas only when the detected pressure wave generating pressure no longer corresponds to the preset or changed preset pressure wave generating pressure, in particular no longer within a predefined error limit of the pressure wave generating pressure.

[0057] More preferably, the pressure regulating device is also switched on and / or off depending on the frequency with which the pressure wave device is operated. Depending on the flow rate, i.e. how often the impact element of the pressure wave device is accelerated per unit time at the preset pressure wave generating pressure, more or less air is consumed, which is regulated by the pressure regulating device. Only when the pressure regulating device no longer achieves the required flow rate or frequency at the preset pressure wave generating pressure, or when this can also be achieved at a lower power level, is the one or more compressors controlled to a higher or lower power level.

[0058] More preferably, in relation to the pressure wave generating pressure P D_i The range and frequency f i The controller of the range has a specific power level L stored in it. i , the power level is associated with a fixed voltage which triggers a specific rotational speed at one or more compressors or continuously switches the compressors on or off in order to carry out the method as described here. The controller is also designed to actuate various valves, in particular the exhaust valve. The active gas pressure P is preferably also stored in the controller. s_i The discrete values ​​of the pressure wave generating pressure P D_iA voltage and / or a frequency are predefined for actuating the compressor and / or a frequency is predefined at which, for example, a valve in a handpiece is to be switched or at least one compressor is to be operated.

[0059] More preferably, at least one compressor of the pressure wave device for performing the method has a plurality of settable, graded power levels at which the at least one compressor can be operated in order to generate the source gas pressure P s_i The corresponding power level can be set in particular by determining a voltage which is associated with the desired pressure wave generation pressure and the set frequency. It is conceivable that at least one compressor generates different source gas pressures at different power levels, for example a source gas pressure P of 2 bar, 5 bar, 8 bar or 10 bar at six different power levels. s_i Then, the pressure regulating device can generate a pressure wave of 0-2 bar, 2-5 bar, 5-8 bar or 8-10 bar at a specific frequency to generate a pressure P D_i The maximum possible source gas pressure P is obtained by way of example in the following table: s_i The different power levels produce pressure P with respect to the corresponding desired pressure wave at a specific frequency D_i The table describes, in particular, the reduction of the source gas pressure to the desired pressure wave generation pressure:

[0060] BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Further advantages and features of the invention are apparent from the following description of preferred embodiments with reference to the accompanying drawings. It goes without saying that the individual embodiments shown in the respective drawings can have features that can also be used in other embodiments, even if this is not explicitly mentioned and as long as this is not explicitly excluded due to technical conditions. The drawings show:

[0062] Figure 1 A pressure wave device according to the invention is shown;

[0063] Figure 2 Show according to Figure 1 Circuit diagram of the pressure wave device;

[0064] Figure 3 Show according to Figure 1 Alternative circuit diagrams of pressure wave devices;

[0065] Figure 4 a flow chart showing the proposed method for treating the human or animal body by means of pressure waves; and

[0066] Figure 5A visualization of the hierarchical model proposed herein that describes the pressure P generated by a pressure wave D_i and a correlation between a frequency at which at least one compressor is operated. DETAILED DESCRIPTION

[0067] Figure 1 A pressure wave device 10 for treating a human or animal body (not shown) is shown, the pressure wave device having a pneumatic drive 14 for generating pressure waves 16 for coupling into the human or animal body. The pressure wave device 10, in particular the pneumatic drive 14, has at least one compressor 18 for generating pressure waves 16 at a source gas pressure P s_i The source gas is generated under the condition that the compressor 18 includes a compressor motor 20. It is conceivable that, instead of one compressor 18, a plurality of compressors 34, 36 ( Figure 2 ). In addition, the pressure wave device 10 has a handpiece 12, wherein the source gas can be introduced into an inlet 24 of the handpiece 12 via a connecting line 22. Via the handpiece 12, the pressure wave 16 can be coupled into the human body or animal body. The handpiece 12 has a slender guide tube 26, in which a projectile 28 can be accelerated by the source gas along the guide tube to an impact body 30. The impact body 30 serves as a transmission element for transmitting the pressure wave 16 from the handpiece 12 to the human body or animal body. The pressure wave 16 is generated by the accelerated movement of the projectile 28 in the guide tube 26. The guide tube 26 is therefore used as an acceleration route for the projectile 28. The pressure wave 16 generated by means of the pressure wave device 10 can penetrate into the human body or animal body up to 50 mm.

[0068] exist Figure 1 In combination Figure 2 and Figure 3 It can be seen that before or at the inlet 24 of the handpiece 12 or optionally at the drive device 14, a control device for adjusting the source gas pressure P is provided in the handpiece 12. s_i The pressure regulating device 32 is particularly used to provide a substantially constant pressure wave generating pressure P D_i By means of the regulator 19, a predetermined pressure wave generation pressure or a desired pressure wave generation pressure can be set at the input, and by means of the activation key 21, the frequency of the introduction of the source gas which accelerates the projectile can be set. A specific power level L is controlled by means of a compressor or a compressor system. i , so the pressure wave generating pressure P can be set by the regulator 19 D_i The frequency f is set by means of the activation key 21 on the handpiece 12 i Here, the source gas pressure Ps_i represents the gas pressure generated by the compressor 18 or the compressors 34, 36 and prevailing before the flow through the pressure control device 32. The pressure wave generates the pressure P D_i From the source gas pressure P after flowing through the pressure regulating device 32 s_i Produced in.

[0069] Figure 2 and Figure 3 Show respectively according to Figure 1 An alternative circuit diagram of the pressure wave device 10 is shown in FIG. Figure 2 , instead of a compressor 18 with a compressor motor 20, the pneumatic drive 14 of the pressure wave device 10 comprises two compressors 34, 36. Each compressor 34, 36 is connected to a compressor motor 38, 40, which drives the respective compressor 34, 36. The compressors 34, 36 are therefore used to compress the source gas, wherein the source gas flows through the cooling zone after its compression, in which a cooling device 42, in particular a cooling coil 42', is arranged. In the cooling device 42, in particular in the cooling coil 42', the compressed source gas is cooled before it is introduced into the handpiece 12 via the connecting line 22.

[0070] An overpressure valve 44 is also provided between the cooling device 42 and the inlet 24 of the handpiece 12 for discharging overpressure of the source gas. The overpressure valve 44 is designed to automatically discharge a pressure exceeding a preset pressure, in particular a maximum source gas pressure P, from the connecting line 22 or even before the source gas enters the connecting line 22. s_i The occurrence of an overpressure in the handpiece 12 can thus be avoided. The overpressure valve 44 is designed, for example, to automatically discharge pressures greater than, for example, 5 or 10 bar, in particular from the connecting line 22. It is of course conceivable to calibrate the overpressure valve 44 to another switching threshold value for the gas pressure, wherein the overpressure valve 44 discharges the gas pressure as necessary. Preferably, the overpressure valve is designed to withstand gas pressures of up to 25 bar.

[0071] It is particularly preferred that a cold trap 46 for collecting condensed source gas, i.e. condensate, is provided in the connecting line 22. It is conceivable that an overpressure valve 44 is provided between the cooling device 42 and the cold trap 46. The cold trap 46 can also be connected to a discharge valve or exhaust valve 48, such as a solenoid valve. Through the exhaust valve 48, condensate can be removed from the pressure wave device 10 and the air can be exhausted, in particular after each use of the pressure wave device 10. This ensures that no residual condensate and source gas remain in the pressure wave device 10 after the treatment. In addition, according to the present invention, a pressure regulating device 32, in particular a pressure regulator, is provided at or before the inlet 24 of the handpiece 12, which pressure regulating device adjusts the source gas pressure P in the connecting line 22 to a value greater than 0.05. s_i Set to a preset, i.e. desired, pressure value, i.e. the pressure wave generates a pressure P D_i It is also conceivable that the pressure regulating device 32 is arranged in the pneumatic drive 14 and regulates the gas pressure before the gas pressure flows into the connecting line 22 .

[0072] In order to check the pressure wave generation pressure P set by the pressure regulating device 32 D_i A pressure sensor 50 is also provided, for example, in the connecting line 22 or at another suitable position. The pressure sensor 50 is configured to detect the pressure wave flowing in the connecting line 22 after passing through the pressure regulating device 32 to generate a pressure P D_i , and display it to the user, for example, on a display.

[0073] Figure 2 and 3 The only difference is the design of the pressure regulating device 32. Figure 2 The pressure regulating device 32 is designed as a valve, in particular as a solenoid valve, which can withstand a pressure of, for example, up to 7 bar, preferably up to 10 bar. Figure 3 The pressure regulating device 32 is designed as a pressure reducer, which can withstand a pressure of up to 7 bar, preferably up to 10 bar, for example. The pressure reducer is basically any pressure reducing valve, which is designed for installation in a hose or pipeline system, although the pressure on the input side (input pressure, in the present case the source gas pressure P s_i ) is different, but the pressure reducing valve can ensure that a certain output pressure (currently the pressure wave generation pressure P) is not exceeded on the output side. D_i). In particular, the discharge valve differs from the pressure reducer in that its task is to reduce the overpressure. This is achieved, for example, by opening the valve and discharging the gas or liquid, for example, into the environment. The valve can be actively controlled or can also be opened automatically as an independent unit at a settable pressure by means of a spring mechanism. In the case of a pressure reducer, however, there is no medium release. The spring mechanism in the pressure reducer always exposes just enough opening cross section that a pre-settable pressure is established behind the pressure reducer.

[0074] Figure 4 A flow chart of a preferred method for treating the human or animal body with pressure waves 16 by means of a pressure wave device 10 as described herein is shown. The method comprises the following steps:

[0075] - switching on at least one compressor 18, 34, 36 to produce source gas,

[0076] - conducting the source gas from at least one of the compressors 18, 34, 36 to the handpiece 12, wherein

[0077] at least one of the compressors 18, 34, 36 is operated in an operating state which generates a first source gas pressure within a source gas pressure range at a first power level,

[0078] - Produce the desired pressure wave by adjusting the pressure of the first source gas to generate the pressure P D_i , by opening or closing the pressure regulating device 32 accordingly.

[0079] In the method proposed here, as in Figure 4 In the first step S1, the power level to be controlled can also be first input, that is, the maximum desired pressure wave generation pressure and the maximum desired frequency can be input, or they are already stored in the pressure wave device 10 for the corresponding power level. In particular, a specific voltage can be set for the pressure wave generation pressure range to be controlled at a specific frequency (preset by the user), in particular a plurality of discretely selectable voltages can be set for the compressor. The selection allows, in particular, the selection of a low-wear and low-noise operating state for the compressor. After the input of the information, the method itself can start in the second step S2.

[0080] In the third step S3, the pressure regulating device 32 is first opened so that the source gas pressure P generated by the one or more compressors 34, 36 is s_ican be guided unhindered through the connecting line 22. In a fourth step S4, the exhaust valve 48 is closed simultaneously or subsequently, which in the open state serves to exhaust the cold trap 46. In a fifth step S5, at least one compressor 18, 34, 36 can then be actuated with a preset voltage U. The preset voltage can be stored in the control unit. The optimal voltage U for low-wear and / or low-noise operation is preferably based on a preset discrete power level L. i Therefore, after switching on at least one compressor 18 , 34 , 36 , the generated source gas pressure flows via the connecting line 22 to the inlet 24 of the handpiece 12 .

[0081] When passing through the connecting pipeline, the source gas is adjusted from the source gas pressure P to the pressure regulating device 32. s_i Adjust to generate the desired pressure wave pressure P D_i For example, a source gas pressure P of 2 bar s_i Able to generate pressure P with the pressure wave of the first range 1 D_i and the frequency f of the first range i The source gas pressure is in particular associated with a first power level L1 of at least one compressor 18, 34, 36. Here, it is now conceivable that the pressure regulating device 32 performs a reduction in order to be able to achieve a pressure between 1 bar ≤ P D_i The pressure wave generates pressure P in the range of ≤2bar D_i It is also conceivable that, in addition to the first range 1, there are also second and third ranges 2, 3, so as to provide a second or third maximum source gas pressure P s_i The desired pressure wave at the desired frequency f generates the pressure P D_i Currently, it is used to set the pressure wave generating pressure P D_i The number of ranges is not limited to three ranges 1, 2, 3. Rather, more or fewer ranges can be provided. The number of ranges is particularly related to the number of settable power levels of at least one compressor.

[0082] With the aid of a pressure sensor 50, for example arranged before or at the inlet 24, the current pressure wave generates a pressure P D_i After passing through the pressure regulating device 32 in the connecting line 22, it is detected. If in the seventh step S7, the pressure P is generated by forming a pressure wave detected D_i and the desired pressure wave produces pressure P D_i The difference between the detected pressure wave and the pressure P is determined. D_i The pressure P corresponding to the desired pressure wave is generated D_i, the setting of the pressure regulating device 32 remains unchanged, and the pressure P generated by the pressure wave is further detected at a certain time interval according to the sixth step S6. D_i If it is determined in the seventh step S7 that the measured pressure wave generates a pressure P D_i , in particular, the pressure wave generating pressure measured in the connecting pipe 22 exceeds the preset pressure wave generating pressure P D_i , which means it is too high, then in the eighth step S8, the pressure regulating device 32 is opened to make the increased pressure wave generate pressure P D_i can escape, in particular from the connecting line 22 (opening of the pressure regulating device 32 is described by step S8 ′).

[0083] This can avoid: increased gas pressure, that is, increased pressure wave generation pressure P D_i , enters the handpiece 12 and is undesirable for treatment.

[0084] Furthermore, according to a sixth step S6, the pressure wave generating pressure P in the connecting line 22 is detected by means of the pressure sensor 50. D_i If it is determined in the seventh difference forming step S7 that the desired pressure wave generating pressure is lower than the detected pressure wave generating pressure P D_i , which means that the predetermined pressure wave generates pressure P D_i If the pressure is too low, the pressure regulating device 32 is at least partially closed (the closing of the pressure regulating device 32 is described by step S9'). This achieves that less gas is blown out, so that the increased pressure wave generates the pressure P D_i It occurs in the connecting line 22 , in particular at or before the inlet 24 of the handpiece 12 .

[0085] Steps S7 to S9 enable automatic pressure adjustment during treatment. This ensures that the pressure wave 16 can generate the desired pressure wave pressure P as preset. D_i In addition, according to the sixth step S6, the gas pressure in the connecting pipe 22 is detected by means of the pressure sensor 50, that is, the pressure wave generates the pressure P D_i and / or source gas pressure P s_i .

[0086] If necessary for treatment with pressure waves, or if it is not (any more) possible to form the desired pressure waves by switching on / off in steps S8', S9', the pressure P is generated. D_i, then in the tenth step S10, the power level of one or more compressors can be "switched" to another level, that is, the speed at which one or more compressors are operated to generate the pressure wave 16 is switched to a higher or lower level. According to this modification scheme according to step S10, the pressure wave generating pressure P can be adjusted again according to the fifth to tenth steps S5 to S10 in the eleventh step S11. D_i .

[0087] Figure 5 The operating state diagram is shown as an example. For each pair of preset frequency f and preset pressure wave, the pressure P is generated. D , provides voltage or operating voltage at the compressor. Figure 5 The diagram in FIG. 1 shows, for power levels 1, 2 and 3, first and second predetermined switching thresholds 52, 54, by means of which a treatment of the human or animal body by means of pressure waves 16 is performed. The range 1, 2, 3 between the switching thresholds 52, 54 can be associated with a discrete rotational speed that can be set at at least one compressor 18, 34, 36, i.e., the power level L 1、2、3 If, for example, a second power level L2 associated with range 2 is set, then the controller stores: the pressure wave generation pressure P of a specific second range at a specific frequency f2 D_B2 can be adjusted by means of the pressure regulating device 32. This means that the pressure regulating device 32 is at least partially opened, partially closed or remains unchanged. If, for example, a third power level L3 associated with the third range 3 is set, then it is stored in the controller that the pressure wave generation pressure P of a specific third range can be manipulated at a specific frequency f2. D_B3 above the second switching threshold 54, ie the pressure regulating device 32 can then be at least partially opened or closed in order to generate the desired pressure wave at the pressure P D_i Set in the third pressure range P D_B3 Inside.

[0088] If, for example, a first power level L1 associated with the first range 1 is set, then the controller stores: at a specific frequency f2, a pressure wave generating pressure P of a specific first range can be manipulated. D_B1 .

[0089] In other words: according to the predetermined frequency f j , can be for each power level L i Adjusting the adjustable pressure wave to generate pressure P within a specific range D_Bi , and generates pressure P according to a predetermined pressure wave D_i , can be for each power level L i Adjust the adjustable frequency f within a specific range Bi .

[0090] In a controller (not shown), a preset switching frequency f and a preset pressure wave generating pressure P are stored for one or more compressors 18, 34, 36. D_i The corresponding voltage setting U. Therefore, according to Figure 5 It turns out that the pressure wave generation pressure P can be changed within the switching thresholds 52, 54 in the power level at a fixed frequency f. D_i (moving along a vertical line), or can generate a pressure P at a fixed pressure wave D_i The frequency f is changed (moved along the horizontal line). The pressure P is generated according to the frequency f and / or the pressure wave D_i , adjusting the power level L by operating one or more compressors 18, 34, 36. Obviously, the proposed solution also includes the following Figure 5 The movement of the curve in the figure, which consists of horizontal and vertical movements, means that the pressure wave is changed to produce pressure P D and frequency f.

[0091] it goes without saying, Figure 5 The relatively few ranges 1, 2, 3 and switching thresholds 52, 54 are purely exemplary. It is conceivable that significantly more ranges and switching thresholds are stored in the control unit, and thus a stepping module with a plurality of fixedly adjustable levels, i.e. at discrete stepped power levels L. It is also self-evident that the pressure wave device 10 can have a plurality of compressors 18, wherein each or a plurality of compressors 18 can have its own compressor motor 20. The use of a plurality of compressors 18 reduces the noise scenario.

[0092] List of reference numerals:

[0093] 10. Pressure wave equipment

[0094] 12 Handpiece

[0095] 14 Pneumatic drive

[0096] 16 Pressure Wave

[0097] 18 Compressor

[0098] 19 Regulator

[0099] 20 Compressor motor

[0100] 21 Activation key

[0101] 22 Connecting pipes

[0102] 24 Entrance

[0103] 26 Guide tube

[0104] 28 Projectile

[0105] 30 Impact Body

[0106] 32 Pressure regulating device

[0107] 34 Compressor

[0108] 36 Compressor

[0109] 38 Compressor Motor

[0110] 40 Compressor Motor

[0111] 42 Cooling device

[0112] 42' Cooling Coil

[0113] 44 Overpressure valve

[0114] 46 Cold Trap

[0115] 48 Exhaust valve

[0116] 50 Pressure Sensor

[0117] 52 First switching threshold

[0118] 54 Second switching threshold

[0119] 1-3 Range

[0120] P D_i Pressure waves generate pressure

[0121] P s_i Source gas pressure

[0122] L i Load range or power level or power class

[0123] F Frequency

[0124] P Pressure

[0125] U Voltage

[0126] Steps S1-S11

Claims

1. A pressure wave device (10) for treating a human or animal body, the pressure wave device comprising: a pneumatic drive (14) for generating a pressure wave (16) which is coupled into the human or animal body, at least one compressor (18, 34, 36) for generating a source gas, and a handpiece (12) into which the source gas can be introduced and by means of which a pressure wave (16) is generated, and A pressure regulating device (32) is used to set a pressure wave generating pressure (P D ), It is characterized in that The at least one compressor (18, 34, 36) for generating the source gas can be set in stages to at least two power levels (L i ), and the pressure regulating device (32) is adjusted at each power level L i The source gas pressure (P s_i ) to adjust the pressure wave generating pressure (P D_i ).

2. The pressure wave device (10) according to claim 1, characterized in that Each power level (L i ) generates pressure value (P) through pressure wave D_Bi ) and the frequency (f) of activating the pressure wave (16) Bi ) is determined by the scope of 3. The pressure wave device (10) according to claim 1 or 2, characterized in that Select the power level (L i ), in which the table stores the pressure values ​​(P D_Bi ) and frequency (f Bi ).

4. The pressure wave device (10) according to any one of the preceding claims, characterized in that Once at a specific frequency (f i ) no longer reaches the pressure wave generation pressure (P D_1 ), at least one of the compressors (18, 34, 36) is capable of switching from a first operating state with a first power level (L1) to a second operating state with a second power level (L2) so as to set a second pressure wave generating pressure (P D_2 ).

5. The pressure wave device (10) according to any one of the preceding claims, characterized in that The pressure regulating device (32) has a pressure reducer or a discharge valve, which in particular has a valve, such as a solenoid valve, wherein the pressure reducer and / or the discharge valve comprises a proportional valve.

6. The pressure wave device (10) according to any one of the preceding claims, characterized in that The pressure regulating device (32) has at least one pressure sensor (50) for determining the pressure wave generating pressure P D_i .

7. The pressure wave device (10) according to any one of the preceding claims, characterized in that At least two compressors (34, 36) are connected to one or each motor (38, 40) for actuating the compressors (24, 36).

8. The pressure wave device (10) according to any one of the preceding claims, characterized in that A cold trap (46) for collecting cooled, condensed source gas is provided between at least one of the compressors (18, 34, 36) and the pressure regulating device (32).

9. The pressure wave device (10) according to any one of the preceding claims, characterized in that An overpressure valve (44) or a discharge valve for drawing out the overpressure of the source gas is provided between at least one of the compressors (18, 34, 36) and the pressure regulating device (32).

10. The pressure wave device (10) according to any one of the preceding claims, characterized in that The pressure wave device (10) can be vented by means of a controllable venting valve (48), in particular a solenoid valve.

11. A method for treating a human or animal body by means of pressure waves (16), the pressure waves being generated by means of a pressure wave device (10), in particular by means of a pressure wave device (10) according to any one of claims 1 to 10, wherein the method comprises the following steps: - switching on at least one compressor (34, 36) to produce a source gas, - conducting the source gas from at least one of the compressors (34, 36) to the handpiece (12), It is characterized in that at least one of the compressors is set in a discretely controllable operating state, to which a discrete power level L is associated, - wherein the pressure wave generating pressure is regulated at a specific frequency (f) by a pressure regulating device (32) by adjusting the first source gas pressure within the power level L, - and wherein the pressure wave generating pressure (P D ).

12. The method according to claim 11, wherein the method further comprises the following steps: - closing the exhaust valve (48), and / or - at least partially opening or at least partially closing the pressure regulating device (32) for conducting the source gas from at least one of the compressors (34, 36) to the handpiece (12).

13. The method according to claim 11 or 12, wherein after detecting the pressure wave generated actually (P D_i ) and then check: the pressure wave detected generates pressure (P D_i ) corresponds to the expected pressure wave to generate pressure (P D_i ), and generates a pressure (P D_i ) and the desired pressure wave to generate pressure (P D_i ) a) keeping the state of the pressure regulating device (32) unchanged as long as the difference is approximately zero; b) the pressure regulating device (32) is at least partially open as long as the difference is positive, i.e. the detected pressure wave generates a pressure (P D_i ) is higher than the desired pressure wave generation pressure (P D_i ),and c) the pressure regulating device (32) is at least partially closed as long as the difference is negative, i.e. the detected pressure wave generates a pressure (P D_i ) is lower than the desired pressure wave generation pressure (P D_i ).

14. The method according to any one of claims 11 to 13, wherein if P is applied to the maximum source gas pressure s_(i-1) ≤P D_i , or for pressure wave generation pressure, apply P D_i ≤P s_(i-1) , then the compressor speed of at least one of the compressors (18, 34, 36) is increased or decreased in stages, wherein the increase or decrease in the compressor speed is proportional to the set power level (L i ) is related to the power level (L i ) generates pressure value (P) through pressure wave D_Bi ) and the frequency (f) of activating the pressure wave (16) Bi ) is determined by the scope of 15. The method according to claim 13 or 14, wherein the power level (L i ) setting and / or the pressure wave generating pressure (P D_i ) adjustment.

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