System for generating powder-gas jet for performing dental treatment

Abstract

A system (100) for generating a powder-gas jet for performing a dental treatment wherein the system (100) is configured for connection to a dentist chair by a connection wherein connection of the system (100) to the dentist chair allows the system (100) to be supplied with a flow of pressurized gas, the system (100) comprising a compressed gas circuit, and a compressed gas circuit configured to direct a flow of pressurized gas into the powder-gas mixing chamber (14) to form a gas-powder mixture, the system (100) being characterized in that the compressed gas circuit comprises at least a pressure regulating device (30) having an inlet (41) and an outlet (42), the regulating device (30) is configured to provide a pressurized gas flow at its outlet (42) with a pressure independent of the pressure of the gas flow at its inlet (41) when supplied with the pressurized gas flow.

Description

Technical Field

[0001] The present invention relates to a system for generating a powder-gas jet for performing dental treatments. Background Art

[0002] Powder-gas injection devices are well known in the technical field of dental treatment. These powder-gas injection devices are intended to provide a powder-gas mixture injected via a nozzle element for air polishing teeth. In particular, the powder used in the powder-gas mixture includes an abrasive, which is intended to remove biofilm, plaque or other substances and / or coloring from the tooth surface. Therefore, the powder-gas mixture is produced by the powder-gas injection device by swirling the pressurized gas and powder in a powder-gas mixing chamber. For example, the powder-gas mixing chamber is implemented as a powder chamber for storing powder, and the pressurized gas enters the powder chamber to form a powder-gas mixture in the powder-gas mixing chamber. The powder-gas mixture leaves the powder chamber and is provided to the nozzle element.

[0003] Preferably, the powder-gas spray device comprises a handpiece having a powder-gas mixing chamber and / or a powder chamber. The handpiece can be oriented and positioned by an operator to direct the nozzle element so that the sprayed powder-gas mixture flows onto the tooth surface. The handpiece is supplied with pressurized gas via a supply line connected to a gas source.

[0004] Preferably, the gas pressure source is part of a dental chair that also provides pressurized gas to a plurality of other dental instruments. For example, the gas pressure source is incorporated into a chair system for positioning the patient and providing all necessary instruments to the operator. The system also includes supply lines that provide electrical energy and / or materials such as fluids, for example water or gas.

[0005] However, these systems usually provide pressurized gas at the gas source at a pressure level significantly greater than the pressure level required by the powder-gas spray device. Therefore, the operator needs to adjust the pressure level at the gas pressure source so that it can be used for the powder-gas spray device. This results in a waste of time and adds extra workload to the operator.

[0006] Alternatively, flow regulating devices are also known in the prior art, which can adjust the flow rate at its outlet. However, if the powder-gas injection device, in particular the nozzle element, is partially or completely blocked or clogged, for example when the nozzle element is in contact with the gums, the flow regulating device will become ineffective and the pressure in the powder-gas mixing chamber will increase. In this case, the risk of emphysema will increase. In addition, the devices of the prior art are subject to pressure changes due to changes in the gas source. Summary of the invention

[0007] In view of the prior art, an object of the present invention is to provide a method for simplifying the attachment of a powder-gas jet device or a handpiece to a gas source, in particular in a dental treatment system, without using flow regulating devices known in the prior art. Another object of the present invention is to provide a device that delivers a constant pressure and is not affected by pressure variations of the pressurized gas flow supplying the system.

[0008] This object is achieved by a system with a powder-gas injection device according to claim 1. Preferred embodiments are incorporated into the dependent claims, the description and the drawings.

[0009] According to a first aspect of the invention, there is provided a system for generating a powder-gas jet to perform a dental treatment, wherein the system is configured to be connected to a dentist's chair via a connection, wherein the connection of the system to the dentist's chair allows the system to be supplied with a pressurized gas flow, the system comprising a compressed gas circuit configured to direct the pressurized gas flow into a powder-gas mixing chamber to form a gas-powder mixture, wherein the compressed gas circuit comprises at least a pressure regulating device having an inlet and an outlet, the regulating device being configured to provide the pressurized gas flow at its outlet with a pressure independent of the pressure of the gas flow at its inlet when it is supplied with the pressurized gas flow. Preferably, the regulating device is a pressure regulator, in particular a pressure reducing regulator, which is configured to provide the pressurized gas flow at its outlet with a pressure independent of the pressure of the gas flow at its inlet when it is supplied with the pressurized gas flow. In particular, the regulating device comprises a valve.

[0010] Contrary to the prior art, the present invention proposes to use a pressure regulating device as part of a system for generating a powder-gas jet for performing a dental treatment. In particular, the regulating device is located upstream of the powder-gas mixing chamber. Thus, independently of the magnitude of the pressure level at the gas source, the pressure level at the outlet of the pressure regulating device remains substantially constant and independently of the pressure level at the inlet of the pressure regulating device and therefore independently of the magnitude of the pressure level at the output of the gas source. The term "independent" means that the pressure at the outlet has a constant value when the pressure of the inlet section exceeds a threshold value. The pressure regulator is preferably selected so that the threshold value is adapted to the pressurized gas supplied to the system, in particular to the pressurized gas supplied to the system.

[0011] As is well known to those skilled in the art, the main function of a pressure reducing regulator is to match the flow of gas through the regulator to the demand of the fluid imposed on it, while maintaining a sufficiently constant output pressure in the output section. If the load flow decreases, the regulator flow must also be reduced. If the load flow increases, the regulator flow must be increased to prevent the controlled pressure from decreasing due to a shortage of fluid in the pressure system. Ideally, the controlled pressure would not vary greatly relative to the set point for a wide range of flow rates, but it is also desirable that the flow through the regulator is stable and the regulated pressure is not subject to excessive oscillations.

[0012] The pressure regulator preferably includes a restriction element, a loading element and a measuring element. The restriction element is a valve that can provide a variable restriction on the flow, such as a stop valve, a butterfly valve and / or a poppet valve. The loading element is a component that can apply the required force to the restriction element. This loading can be provided by a weight, a spring, a piston actuator or a diaphragm actuator in combination with a spring. The function of the measuring element is to determine when the inlet flow is equal to the outlet flow. The diaphragm itself is usually used as a measuring element; the diaphragm can be used as a combined element. It is obvious to a person skilled in the art that there are a variety of possible valve systems that can be used to achieve the effect of the pressure regulator. The pressure regulator is preferably selected so that the pressure regulator is suitable for handling the pressure level of the pressure source in the dentist's chair.

[0013] Preferably, the pressure of the gas flow at the outlet of the pressure regulating device is independent of any changes in the pressure of the gas flow at the inlet. This independence of the magnitude of the pressure level at the gas pressure source allows to simplify the attachment of the system for generating a powder-gas jet to the gas source, because this independence avoids complex regulation of the output level of the pressurized gas at the gas source. Instead, the operator only needs to attach the system, in particular the handpiece and / or the powder-gas jet device, for example via a supply line, to the gas source, in particular to a certain terminal of the gas source, and the pressure level at the outlet of the pressure regulating device is automatically set to provide a predetermined level of pressurized gas to the powder-gas mixing chamber. It is well known to those skilled in the art that when the pressure at the inlet of the pressure regulating device exceeds a threshold value, the pressure regulating device provides a constant pressure at its outlet.

[0014] In particular, the pressure regulating device is independent of the pressure level at the gas source. "Independent of the pressure level at the gas source" preferably means that the pressure regulating device does not set the pressure level at the gas source and in particular cannot be used with another treatment device also intended for use with a gas source. The pressure regulating device is only assigned to the system for providing a powder-gas jet. The pressure regulating device is assigned to the powder-gas jet device and is preferably dedicated to the powder-gas jet device.

[0015] In particular, it is provided that the gas pressure source is part of a dental treatment system which is configured to also handle a plurality of different handpieces and / or dental instruments which can be attached to the system, in particular a plurality of dental treatment devices with pressurized gas using the gas source. In other words: the gas pressure source is configured to supply gas or pressurized gas to a plurality of different devices, each of which has different requirements with regard to the pressure level at its input.

[0016] Alternatively or additionally, a system is provided, the system comprising a powder-gas injection device for performing a dental treatment by injecting a powder-gas mixture, the system comprising:

[0017] - a powder-gas mixing chamber, wherein a pressure regulating device having an inlet and an outlet is arranged upstream of the powder-gas mixing chamber, wherein the outlet is connected to the powder-gas mixing chamber, and wherein the pressure regulating device determines the pressure level at its outlet independently of the pressure level at its input.

[0018] In particular, the system comprises a handpiece. Preferably, the powder chamber and / or the pressure regulating device are integrated in the handpiece. In particular, the system comprises a supply line, wherein the supply line is integrated with the pressure regulating device. Preferably, it is provided that the system comprises a supply line, which is preferably used to form at least a part of a compressed gas circuit, so as to convey pressurized gas from a gas pressure source to a powder-gas mixing chamber, wherein, preferably, the pressure regulating device is arranged between the gas pressure source and the powder-gas mixing chamber. In particular, it is beneficial to arrange the pressure regulating device close to the handpiece so that an operator can operate the pressure regulating device, for example to make fine adjustments or adjustments.

[0019] In particular, the system comprises a handpiece comprising a nozzle for ejecting a powder-gas mixture, the handpiece being configured for connection to a dentist's chair via a supply line designed to supply at least one gas stream to the handpiece. Furthermore, the dentist's chair comprises a gas source for providing pressurized gas to form a powder-gas mixture in a powder-gas mixing chamber. The gas pressure source does not need to be specialized or adapted for the attached powder-gas ejection device. Thus, a simplified replacement of the handpiece and / or the powder-gas ejection device can be established, in particular without any adjustment of the pressure level at the regulating device of the gas source.

[0020] In addition, the use of a pressure regulating device avoids the use of a flow regulating device known in the prior art. These flow regulating devices adjust the flow of the gas-powder mixture delivered, for example, by setting the size of the cross section of the delivery channel. A flow regulating device or flow restrictor is an element (e.g., a smaller orifice, a tap, ...) that produces a pressure drop at a given flow through it, i.e., the higher the flow, the higher the pressure drop. If the flow tends to zero (e.g., due to an obstructed outlet), the pressure drop also tends to zero. In the case of a completely blocked outlet, the outlet pressure will be equal to the inlet pressure. The flow will also vary according to the difference between the inlet pressure and the outlet pressure, resulting in a performance change if the inlet pressure changes. Such a flow regulating device is particularly problematic in the following cases: the handpiece, especially the nozzle element, is partially or completely blocked, for example, when the nozzle element is in contact with the patient's gums. In these cases, the flow regulating device will become inefficient, and the pressure inside the powder-gas mixing chamber will rise. In this case, the risk of emphysema will increase. With this in mind, avoiding the use of a flow regulating device, especially a pressure regulating device, is also beneficial for reducing the risk of emphysema during operation. Preferably, it is provided that the powder-gas injection device and / or a system having the powder-gas injection device has no flow control device.

[0021] It is also conceivable that the system is formed by a powder-gas jet device, in particular by a handpiece of a powder-gas jet device.

[0022] Preferably, the pressure regulating device is integrated into the handpiece and / or into the supply line. In particular, in case the pressure regulating device is integrated into the handpiece, a compact configuration of the pressure regulating device is preferred. In case the pressure regulating device is integrated into the supply line, the pressure regulating device facilitates access to the pressure regulating device by an operator, for example for maintenance or for adjusting the pressure level at the outlet.

[0023] Furthermore, it is provided that the gas pressure source is configured to provide pressurized gas at a pressure level greater than the pressure level required by the powder-gas injection device. In particular, the gas pressure source is intended to supply pressurized gas to a variety of different instruments, so that the high pressure level ensures that all instruments have gas at a sufficient pressure level. In this case, it is advantageous to have a pressure regulating device, because this ensures that the pressure level of the gas pressure source exceeds a threshold value. Above the threshold value, the pressure level at the outlet of the pressure regulating device is constant, in particular regardless of the size of the pressure level at the input side of the regulating device. Preferably, the pressurized gas provided by the gas pressure source at the terminal is at least twice, more preferably three times or more, and most preferably four times or more the pressure level required by the powder-gas injection device. The pressure level required by the powder-gas injection device produces the required powder-gas mixture inside the powder-gas mixing chamber.

[0024] In particular, the pressure regulating device is configured to adjust the ratio between the pressure at the inlet and the pressure at the outlet. This advantageously allows the magnitude of the output pressure to be adjusted when necessary. Preferably, it is provided that the regulating device is configured to adjust the pressure level at its outlet, preferably by means of an adjusting element to adjust the pressure level at its outlet. For example, the pressure regulating device comprises an annular element that can be rotated or spun to adjust the pressure level at the outlet of the pressure regulating device. Such an adjusting element can be used to fine-tune the pressure level at the outlet of the pressure regulating device. For example, the regulating device is directly arranged at the handpiece so that the operator can adjust it directly at the handpiece. The adjusting element is not intended to reduce the pressure level of the gas pressure source to the pressure level required by the powder-gas injection device. The potential change related to the pressure level is the difference between the pressure at the inlet of the pressure regulating device and the pressure at the outlet of the pressure regulating device at most 1 / 5.

[0025] Preferably, it is provided that the pressure regulating device is formed as a regulator, which is inserted into the powder-gas injection device between the gas pressure source and the handpiece. Thus, a powder-gas injection device or system without a regulating device can be advantageously upgraded. In particular, by selecting the interface of the pressure regulating device as the interface between the handpiece and the supply line, the pressure regulating device formed as a regulator can be easily integrated in the section between the supply line and the handpiece to have the benefits discussed above.

[0026] In general, every pressure regulating device is conceivable. In the following, preferred embodiments of such a pressure regulating device are discussed:

[0027] Preferably, a pressure regulating device is provided, the pressure regulating device comprising:

[0028] -Base ontology, and

[0029] a valve element which is movable relative to the base body between an open position and a closed position, wherein, when the valve element is in the closed position, the valve element separates an inlet section of the pressure regulating device from an outlet section of the pressure regulating device, and wherein, when the valve element is in the open position, fluid can be transferred from the inlet section to the outlet section,

[0030] In particular, the pressure regulating device, in particular the section of the pressure regulating device that interacts with the fluid in the inlet section, is configured such that when the valve element is in the closed position, the fluid in the inlet section generates a force acting on the valve element, and wherein forces in the outlet section act on the valve element, which forces compensate each other. The inlet section forms the inlet of the pressure regulating device, and the outlet section forms the outlet of the pressure regulating device.

[0031] The results show that, by such a pressure regulating device, it is advantageously possible to avoid using a second valve mechanism to eliminate the transmission of the pressure change of the fluid in the inlet section to the fluid in the outlet section. This elimination is achieved by configuring the pressure regulating device, in particular by selecting the corresponding geometric shapes of the valve element and the basic body in the transfer area, the transfer area comprising a regulating opening, through which the fluid passes when the valve element is in the open position. In particular, the geometry of the valve element and / or the basic body is adjusted so that the interaction between the fluid and the valve element and / or the basic body produces forces that compensate each other. Preferably, the geometry of the valve element and / or the basic body is adjusted in the transfer area, in particular in the area affected by the inlet pressure of the valve element. Since the transfer area is usually subjected to the force of the pressure of the inlet section, which may lead to unintentional movement of the valve element, the present invention creates a pressure regulating device whose valve element is not affected by the pressure change in the inlet section of the pressure regulating device. Preferably, it is provided that the shape of the valve element and / or the basic body is configured so that the forces generated in the inlet section compensate each other, and therefore there is no additional force acting on the spring element. Without such adjustment or configuration, changes in the inlet pressure will act on the biasing spring element and may move it to an undesirable position, resulting in pressure changes being transmitted from the inlet section to the outlet section. Therefore, by using the pressure adjustment device discussed herein, it can be ensured that the outlet pressure is independent of the influence of changes in the fluid pressure in the inlet section. Preferably, the side wall and / or the front end of the valve element are configured to be affected by the fluid in the inlet section and its pressure.

[0032] Advantageously, the pressure level at the outlet section / outlet of the pressure regulating device is less sensitive to small changes in the pressure level at the inlet section / inlet. This has advantages for incorporation into a system with a powder-gas injection device. In addition, only a single moving valve element, i.e. a plunger element, is used, which allows a compact design while keeping the pressure drop low. The compactness is further improved due to the relatively large flow cross-section through the radial inlet opening and outlet opening and the annular valve seat geometry. Since the number of sealing areas can be reduced by using a pressure regulating device as discussed above, the possibility of leakage can be minimized and friction can be reduced. This also reduces the hysteresis effect of the pressure regulating device, which would otherwise occur after a certain number of operating cycles.

[0033] Preferably, it is provided that the pressure regulating device does not have a membrane and / or that the fluid pressure in the outlet section acts directly on the valve element. In particular, the valve element is made of plastic and / or metal. It is even conceivable that the valve element is made of an elastic material and comprises, for example, a first sealing element and / or a third sealing element for sealing the fluid flow relative to the outside. The valve element is, for example, formed in a plunger-like manner and / or is arranged in the pressure regulating device so that the valve element can be transferred between its open position and closed position by a translational movement along a translational direction. The fluid can be a liquid or a gas.

[0034] Preferably, it is provided that the valve element has a head section and an axis section, the head section being arranged inside the receiving area of ​​the seat element of the basic body. In particular, the valve element contacts the seat element of the basic body through the outer side of its head section, and the inner side of the valve element contacts the outer side of the core element of the basic body. Therefore, these two contacts limit the freedom of movement to a translation along a translation direction, which is preferably parallel to the longitudinal direction of the extension of the core element. Preferably, it is provided that the core element extends from the inlet section to the outlet section. In particular, the inlet section of the core element is fixed to or incorporated into the seat element of the basic body. For example, the seat element has a hole, and the core element passes through the seat element, in particular through the hole, in the assembled state. In addition, it is provided that the core element passes through the valve element.

[0035] Preferably, it is provided that the valve element contacts the basic body in a first sealing area located in an inlet section of the pressure regulating device and in a second sealing area, wherein the second sealing area is established in a closed position and is intended for sealing the inlet section relative to the outlet section, wherein a first internal cross-section of the valve element in the first sealing area corresponds, in particular in size and / or shape, to a second internal cross-section of the valve element in the second sealing area.

[0036] In particular, the second inner cross section forms an outlet through which the fluid leaves the inlet section and enters the outlet section of the pressure regulating device. The outlet is opened when the valve element is in the open position and closed when the valve element is in the closed position. Thus, the fluid passes through the regulating opening at the front side of the valve element, in particular the plunger element. The results show that by selecting the first inner cross section and the second inner cross section of the same size and / or shape, all additional forces can be suppressed or even eliminated, otherwise these additional forces will be generated and act on the valve element, so that the position of the valve element will be shifted to an uncertain position. Preferably, the first diameter of the first inner cross section corresponds to the second diameter of the second inner cross section. Preferably, the term "corresponding" means: relative to the average value of the first inner cross section and the second inner cross section, the deviation of the size and / or shape is within a limit of 15%, more preferably within a limit of 10%, and most preferably within a limit of 5%.

[0037] Preferably, the ratio of the difference between the first extension of the first internal cross section and the second extension of the second internal cross section to the average of the first extension and the second extension is less than 0.2, preferably less than 0.1, and most preferably less than 0.05. In particular, if the extension varies in the cross section, the term "extension" refers to the maximum extension within the first internal cross section or the second internal cross section. In the case of a circular cross section, the first extension and / or the second extension corresponds to the first diameter of the first internal cross section and / or the second diameter of the second internal cross section.

[0038] Preferably, the ratio of the difference between the first area of ​​the first inner cross-section and the second area of ​​the second inner cross-section to the average of the first area and the second area is less than 0.2, preferably less than 0.1 and most preferably less than 0.05.

[0039] Preferably, it is provided that the basic body, in particular the core element, comprises a channel having a first part located in the inlet section and a second part located in the outlet section. In particular, it is provided that the fluid is guided within the channel, i.e. inside the core element, from the inlet channel to the outlet channel. In order to transfer the fluid from the inlet section to the outlet section, i.e. from the first part to the second part of the channel, when the valve element is in the open position, the fluid leaves the core element at an opening incorporated into the core element and bypasses the outer side of the core element to enter the core element at another opening of the core element.

[0040] Preferably, the first part and the second part are arranged coaxially with each other. This simplifies the process of incorporating the pressure regulating device as a built-in component into various fluid systems. In particular, since the direction of the fluid is continuous by using the pressure regulating device, it is no longer necessary to perform some specific redirection of the fluid in order to incorporate the pressure regulating device.

[0041] Preferably, it is provided that the valve element at least partially surrounds the basic body, in particular a core element of the basic body, and that a cavity is formed between the inner side of the valve element and the basic body, through which the fluid passes in the open position of the valve element to be conveyed from the inlet section to the outlet section. In particular, the fluid passes through the cavity when the valve element is in the open position.

[0042] Preferably, it is provided that the basic body has an opening which is fluidically connected to the cavity. In particular, the cavity surrounds the core element in a region close to the second sealing element and / or the opening, via which the fluid leaves the first part of the channel and enters the cavity. In particular, it is provided that any fluid flowing from the first part of the channel to the second part of the channel thereby passes through the opening and / or the cavity.

[0043] Preferably, when the valve element is in the closed position, a cavity is formed between the first sealing area and the second sealing area. Thus, a symmetrical arrangement between the first sealing section and the second sealing section can be established. In particular, the cavity defines the forces of the fluid acting on the valve element. Thus, forces directed in the translation direction and opposite to the translation direction can be generated. Thus, these forces compensate each other.

[0044] In particular, the pressure regulating device comprises a spring element for biasing the valve element relative to the base body, wherein preferably the restoring force of the spring element can be adjusted. In order to adjust the restoring force, it is preferably provided that the nut element or the adjusting screw can be displaced relative to the base body in order to adjust the restoring force established by the spring element. Thus, the pressure established by the fluid in the outlet section can be adjusted.

[0045] Preferably, it is provided that the basic body has a first sealing element for forming a first sealing area and / or a second sealing element for forming a second sealing area. For example, the first sealing element and / or the second sealing element is an O-ring or an annular body having a protruding lip element that causes sealing.

[0046] In particular, the basic body has a core element and a seat element, the seat element comprising a receiving area for receiving the valve element, in particular for receiving the head section of the valve element. In particular, the core element and the seat element are separate components. The use of separate components for the core element and the seat element simplifies the assembly of the cross section and the seat element.

[0047] Preferably, it is provided that the first part of the channel and the second part of the channel have the same extension perpendicular to the flow direction of the fluid when the fluid is transferred from the inlet section to the outlet section, said extension being in particular measured perpendicular to the translation direction of the valve element.

[0048] Preferably, the valve element is the single moving part in the pressure regulating device. In other words, there are no other moving parts in the pressure regulating device, and it is still possible to avoid any pressure changes of the fluid in the inlet section being transferred to the pressure at the outlet section.

[0049] In particular, the basic body is formed by a core element, and the valve element surrounds the core element in both the inlet section and the outlet section, in the outlet section, a further cavity is formed between the valve element and the core element. In particular, the fourth sealing element is located between the valve element and the core element. The further cavity preferably surrounds a further opening for transferring the fluid into the second part of the channel. Therefore, a seat element is no longer required, and the pressure regulating device can preferably be realized by using an axial core element surrounded by the valve element.

[0050] Preferably, the head section includes a sealing body protruding inwardly for forming a sealing contact with the second sealing element in the closed position. In order to surround the core element in the outlet section, the valve element has a side wall protruding from the sealing body along a direction parallel to the translation direction. The length of the side wall measured in a direction parallel to the translation direction is equal to or greater than the length of the head section without a protruding side wall. In other words, the side wall extends far enough to ensure that another cavity is formed in the closed and open positions of the valve element. In particular, the first sealing element, the second sealing element and the fourth sealing element are arranged between the valve element, in particular the inner side of the valve element and the core element, in particular the outer side of the core element. The cavity and the other cavity are included in the region with the first sealing element, the second sealing element and the fourth sealing element. Preferably, the pressure regulating device formed by the valve element and the core element only requires three sealing elements. Preferably, the cavity is assigned to the inlet section, and the other cavity is assigned to the outlet section. Specifically, the cavity and the other cavity both surround the core element and are formed only by the valve element and the core element (except the first sealing element, the second sealing element and the fourth sealing element). In other words: no further components such as seat elements are required.

[0051] According to a preferred embodiment, it is provided that the pressure regulating device comprises a membrane or a sliding seal which is mechanically connected to the movable valve element. In other words: it is also conceivable that the pressure regulating device has a configuration different from a membrane-less configuration.

[0052] Another aspect of the invention is a powder-gas injection device for use in a system according to the invention. All benefits and specifications discussed in the context of the system similarly apply to the powder injection device, and vice versa.

[0053] Another aspect of the invention is the use of a pressure regulating device in a powder-gas injection device according to the invention. The advantages and specifications discussed in the context of the powder-gas injection device of the invention apply analogously and vice versa.

[0054] In the absence of explicit description, the various embodiments or their various aspects and features can be combined or exchanged with each other without limiting or expanding the scope of the described invention, as long as such combination or exchange is meaningful and consistent with the meaning of the invention. Where applicable, the advantages described with respect to one aspect of the invention are also advantages of other aspects of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In the attached drawings:

[0056] Figure 1 A system including a powder-gas injection device according to a first preferred embodiment of the present invention is shown,

[0057] Figure 2 A system including a powder-gas injection device according to a second preferred embodiment of the present invention is shown,

[0058] Figure 3 shows the effect of a pressure regulating device compared to a flow regulating device,

[0059] Figure 4 A first exemplary embodiment of a pressure regulating device in an open state for use in a system according to the invention is shown,

[0060] Figure 5 A first exemplary embodiment of a pressure regulating device in a closed state for use in a system injection device according to the invention is shown,

[0061] Figure 6 Shows Figure 5 Detailed view of

[0062] Figure 7 a cross-sectional view showing a second exemplary embodiment of a pressure regulating device for use in a system injection device according to the invention when the valve element is in a closed position,

[0063] Figure 8 a cross-sectional view showing a third exemplary embodiment of a pressure regulating device for use in a powder-gas injection device according to the present invention when the valve element is in a closed position, and

[0064] Fig. 9 A cross-sectional view of a fourth exemplary embodiment of a pressure regulating device for use in a system according to the invention is shown when the valve element is in a closed position. DETAILED DESCRIPTION

[0065] exist Figure 1 In the present invention, a system 100 including a powder-gas jet device according to a preferred embodiment of the present invention is presented. These powder-gas jet devices are preferably used to remove stains, tartar or staining from teeth and / or for removing dental biofilm, in particular by means of an air polishing method using abrasive particles. The powder-gas jet device provides an output stream capable of removing stains and staining and / or removing dental biofilm. In operation, the output stream is ejected by a nozzle element 17 at its front end.

[0066] exist Figure 1In an embodiment of the present invention, the powder-gas injection device comprises a handpiece 11 having a nozzle element 17. In particular, the handpiece 11 comprises a mixing chamber 14, i.e. a powder-gas mixing chamber 14, which is integrated into the handpiece 11. Such a handpiece 11 for air polishing of teeth by means of abrasive particles is also referred to as a "handheld". Such a handpiece 11 is preferably connected to a gas pressure source 60 via a supply line 16. The supply line 16 can be a hose or a tube, which provides or guides pressurized gas to the handpiece 11, in particular to the mixing chamber 14 of the handpiece 11. The mixing chamber 14 is arranged and configured to achieve the ejection of a powder-gas mixture through the nozzle element 17, wherein the pressurized air of the gas pressure source 60 is used to swirl the powder and the gas to form a powder-gas mixture inside the mixing chamber 14.

[0067] In particular, Figure 1 The handpiece 11 illustrated in the figure is reversibly connected to a gas pressure source 60 at a terminal 61 of the gas pressure source 60. In particular, it is provided that the assembly comprising the handpiece 11 and the supply line 16 can be removably attached to the terminal 61, so that the gas pressure source 60 can also be used for other, in particular different dental treatment systems and / or devices. In particular, the gas pressure source 60 is incorporated into a supply system to provide pressurized gas to different types of dental treatment systems and / or devices. Such a gas source or gas pressure source 60 can have a compressor and / or a turbine, thereby providing gas at a determined level, in particular at a level greater than that required for operating the powder-gas injection device. It is even possible that the gas pressure source 60 includes a regulating device for setting and determining the pressure level at the output or outlet of the gas pressure source 60, in particular the pressure level at the terminal 61. In the prior art, when an operator attaches a handpiece 11 intended for air polishing, it is usually necessary for the operator to adjust the pressure level at the gas pressure source 60. This is necessary in particular since the gas pressure source 60 which is usually used provides gas at a pressure level which is significantly higher than the pressure level which is required in the case of operating the powder gas injection device.

[0068] Therefore, in the prior art, the operator is forced to perform such a complex adaptation, resulting in a loss of labor and time. In contrast, it is preferably provided that a pressure regulating device 1 is included in the supply line 16 and / or the handpiece 11, the pressure regulating device 1 having an inlet 41 and an outlet 42. The pressure regulating device 1 is particularly configured to generate a fixed and determined pressure level at its outlet 42, regardless of the size of the pressure level at its input 41. The function of setting the pressure level at the outlet / output 42 to a determined and / or desired pressure level is particularly applicable when the pressure level at the input 41 of the regulating device 1 exceeds a threshold value.

[0069] In case the handpiece 11 is attached to a universal gas pressure source 60, the desired output level of the pressurized gas will be set automatically due to the pressure regulating device 1, independently of the gas provided by the gas pressure source 60. In other words: the operator only has to plug the handpiece 11 into the terminal 61, in particular by using the supply line 16, without having to spend time adjusting the pressure level by regulating the pressure level at the gas pressure source 60. This significantly simplifies the replacement and attachment of the handpiece 11 for air polishing. For example, the gas pressure source 60 is integrated into a chair system, which is also used to carry dental instruments and preferably also includes supply lines for providing electrical energy and / or materials, such as gas and / or water.

[0070] exist Figure 1 In the embodiment shown in , the powder-gas injection device comprises a pressure regulating device 1 formed as a regulator, which is preferably arranged in an interchangeable manner between the handpiece 11 and the supply line 16. For example, it is conceivable that the pressure regulating device 30 has an interface that is adapted to the interface between the supply line 16 and the handpiece 11, so that the pressure regulating device 1 formed as an adapter can be added to the system 100 simply by inserting it into the system 100 between the handpiece 11 and the supply line 16. Thus, even a powder-gas injection device of the prior art can be upgraded by incorporating the pressure regulating device 1 into the powder-gas injection device of the prior art.

[0071] Furthermore, it is conceivable that the pressure regulating device 1, in particular the adapter, comprises an adjusting element which is configured to set the pressure level at the output 42 of the pressure regulating device 1. Thus, a way can be provided to finely adjust the output level of the pressurized gas at the outlet 42 of the pressure regulating device 1. For example, it may be reasonable to vary the biasing force of a biasing member which is part of the pressure regulating device 1 by means of the adjusting element. This will be Figures 4 to 9 The adjustment element may be implemented as a ring that rotates to perform fine adjustment.

[0072] Figure 2 The embodiment illustrated in FIG. generally corresponds to Figure 1 implementation method. Figure 1 and Figure 2 The main difference between the two is that the pressure regulating device 1 is integrated into the handpiece 11, in particular into the grip section of the handpiece 11, in particular upstream of the mixing chamber 14. Such an integration necessitates a particularly compact design and it turns out that, in particular Figures 4 to 9 The pressure regulating device 1 discussed in detail in the embodiments of FIG. 1 is so compact that the pressure regulating device 1 can be incorporated into the handpiece 11 without enlarging the size of the handpiece 11 .

[0073] exist Figure 3 , a diagram is illustrated showing the dependence of the pressure inside the mixing chamber 14 on the pressure at the inlet 41 of the pressure regulating device 1, i.e., the pressure level present at the terminal 61 of the gas pressure source 60. In particular, the diagram compares the case of a powder-gas injection device with a pressure regulating device 1 on the one hand (see the lines with reference numerals C and D) and the case of a powder-gas injection device with a flow regulating device on the other hand (see the lines with reference numerals A and B). Such flow regulating devices are also known for regulating the output flow ejected from the nozzle element 17 of the powder-gas injection device. Although these devices can regulate the flow of the ejected powder-gas mixture, they cannot limit the pressure level at the outlet. The greater the pressure at the inlet of the flow regulating device, the greater the pressure in the mixing chamber 14. In contrast, the pressure regulating device 1 is configured, for example, to produce a constant pressure level at its outlet 42 when the pressure level at the inlet 41 exceeds a certain value, for example, greater than 2.5 bar, preferably greater than 3.5 bar, and more preferably greater than 4 bar. In this case, the pressure level at the outlet 42 remains substantially constant, regardless of the magnitude of the pressure level at the inlet side 41 of the pressure regulating device 1. The figure shows the static (B, D) and dynamic (C, A) pressure behavior of the two systems, namely the pressure regulating device 1 on the one hand and the flow regulating device on the other hand.

[0074] Thus, the use of the pressure regulating device 1 makes it possible to advantageously control the powder flow and thus the treatment efficiency in a more precise manner compared to methods known in the prior art, for example by using a flow device. Furthermore, the risk of emphysema, in particular in the case of subgingival treatment, is reduced compared to methods of the prior art without the pressure regulating device 1.

[0075] As already mentioned, Figures 4 to 9 The pressure regulating device 1 is advantageous, in particular, because the pressure level at the outlet section / outlet 42 of the pressure regulating device 1 is less sensitive to small changes in the pressure level at the inlet section / inlet 41. In addition, only a single movable valve element 10, i.e. a plunger element, is used, which enables a compact design while keeping the pressure drop low. The compactness is further increased due to the relatively large flow cross section through the radial opening 46 and the further opening 48 and the annular seat geometry. In addition, it is possible to use a plurality of movable valve elements 10, i.e. a plunger element, to reduce the pressure drop. Figures 4 to 9 The pressure regulating devices discussed in the previous section are used to reduce the number of sealing areas, thereby minimizing the possibility of leakage and reducing friction. This also reduces the hysteresis effect that would otherwise occur after a certain number of operating cycles.

[0076] Furthermore, the pressure regulating device 1 is easy to manufacture and has a self-centering mechanism, since the plunger is only guided on a central shaft or core element, which avoids the need for precise adjustments and settings between components.

[0077] Figure 4 A cross-sectional view of a pressure regulating device 1 according to a first preferred embodiment of the present invention is shown, in particular a cross-sectional view of the pressure regulating device 1 when the valve element 10 is in an open position. The pressure regulating device 1 is preferably a valve, which controls the pressure of a fluid to a desired value. Such a pressure regulating device 1 is typically included in a pipeline system and / or at an outlet of a fluid source. The fluid may be a liquid or a gas. The pressure regulating device 1 discussed here is preferably part of a dental treatment device, such as a powder injection device or a toothbrush device. Preferably, the pressure regulating device 1 is a pressure reducing regulating device and / or does not have a membrane used in a pressure regulating device 1 of the prior art. The necessary components of the pressure regulating device 1 are a base body 21, 22 and a valve element 10, wherein the valve element 10 can be moved or displaced between an open position and a closed position. In Figure 1 In the embodiment illustrated in the figure, the basic body 21, 22 is formed by two parts, namely the core element 22 and the seat element 21. In the illustrated embodiment, the core element 22 and the seat element 22 are permanently fixed to each other by form fit, material fit and / or friction fit. It is also conceivable that the core element 22 and the seat element 21 are formed by a single integral part.

[0078] The valve element 10 can move between an open position and a closed position relative to the basic body 21, 22, wherein, when the valve element 10 is in the closed position, the valve element 10 separates the inlet section 41 of the pressure regulating device 1 from the outlet section 42 of the pressure regulating device 1, and wherein, when the valve element 10 is in the open position, the fluid can be transferred from the inlet section 41 to the outlet section 42. Figure 1 The pressure regulating device 1 is illustrated when the valve element 10 is in the open position. Thus, the fluid flows from the inlet section 41 of the pressure regulating device 1 to the outlet section 42 of the regulating device 1. In this case, the outlet section 42 can increase the pressure with the newly introduced fluid until the desired pressure is reached. When the outlet pressure, i.e. the pressure of the outlet section 42 overcomes the restoring force of the spring element 28, the pressure generated in the outlet section 42 automatically causes the valve element 10 to move from the closed position to the open position, wherein the spring element 28 biases the valve element 10 relative to the basic body 21, 22. Thus, the valve element 10 is preferably moved by a translational movement along a direction parallel to the translation direction T.

[0079] In particular, it is provided that the valve element 10 has a shaft section 10 ′ and a head section 10 ″. In the assembled state, in the illustrated Figure 1In the embodiment of the present invention, the valve element 10 surrounds the core element 22, and the core element 22 is particularly formed as an axis. Therefore, it is provided that the valve element 10 can be displaced along the longitudinal direction of the core element 22 of the base body 21, 22 to move between the open position and the closed position along the translation direction T. The core element 22 at least partially forms a track for moving the valve element 10 along the translation direction T. In particular, the shaft region 1" of the valve element 10 is arranged in the inlet section 41 to be coaxial with the longitudinal direction of the core element 22 or the outer wall side of the core element 22. In particular, the valve element 10 is guided by the shaft section 1" of the valve element 10 and the outer side of the core element 22, in particular, in the inlet section 41 of the pressure regulating device 1 by the shaft section 10" of the valve element 10 and the outer side of the core element 22.

[0080] Furthermore, the valve element 10 comprises a head section 10', which has an inner diameter which is increased compared to the inner diameter of the shaft section 1 "of the valve element 10. The valve element 10 preferably has a plunger-like shape. In particular, it is provided that in the head section 10' of the valve element 10, a cavity 43 is formed on the inner side of the valve element 10, through which the fluid flows when the valve element 10 is in the open position, as shown in FIG. Figure 1 . In particular, it is provided that the cavity 43 is formed by the inner side of the valve element 10 and the outer side of the core element 22 of the basic body 21, 22. In particular, the cavity 43 is in fluid communication with a first part 40' of the channel 40 included in the core element 22 of the basic body 21, 22. In particular, it is provided that the core element 22 has an opening 46 through which the fluid leaves the first part 40' of the channel 40 and enters the cavity 43. When the valve element 10 is in the open position, the fluid leaves the cavity 43 via a regulating opening 49 at the front end of the valve element 10. In particular, it is provided that the core element 22 has a diameter that tapers in the longitudinal direction in this area, which is intended to be opened or closed to regulate the flow of the fluid. The fluid that bypasses the outer side of the core element 22 re-enters the second part 40' of the channel 40 incorporated in the core element 22 of the basic body 21, 22 via a further opening 48, which is part of the outlet section 42 of the pressure regulating device 1.

[0081] Preferably, the pressure regulating device 1 is a membraneless pressure regulating device 1 .

[0082] In order to adjust the movement of the valve element 10 so that a desired pressure is established in the outlet section 42 of the pressure regulating device 1, the spring element 28 is connected to the basic bodies 21, 22, in particular to the core element 22 of the basic bodies 21, 22, via the nut element 24. During the transition of the valve element 10 between the open position and the closed position, by rotating the nut element 24 or displacing the nut element 24 in a direction parallel to the longitudinal direction of the core element 22 or in a direction parallel to the translation direction T of the valve element 10, the restoring force of the spring element 28 can be adjusted, and thus the force or pressure required to displace the valve element 10 from the closed position to the open position can be adjusted.

[0083] exist Figure 5 , the valve element 10 is shown in the closed position. Figure 1 of the pressure regulating device 1. In the closed position, the cavity 43 is filled with a fluid at the pressure of the inlet section 41 of the pressure regulating device 1. In particular, the cavity 43 is formed between the first sealing element 31 and the second sealing element 32, and the second sealing element 32 is in contact with the valve element 10 in the closed position, in particular, with the outer edge of the regulating opening 49 at the front side of the valve element 10, for sealing the inlet section 41 relative to the outlet section 42. Therefore, when the valve element 10 is in the closed position, a second sealing area 52 is formed. The first sealing area 51 is formed between the shaft section 10' of the valve element 10 and the outer side of the core element 22, which is arranged close to the inner side or inner wall of the shaft section 10' of the valve element 10. In particular, the opening 48 is arranged between the first sealing element 31 and the second sealing element 32 in a direction parallel to the longitudinal direction. Through such a specific design of the cavity 43, which preferably surrounds the core element 22, in particular completely surrounds the core element 22, a force can be generated by the pressure inside the inlet section 41, which acts on the valve element 10, in particular on the inner wall of the head section 10' of the valve element 10, and compensates each other.

[0084] Preferably, it is provided that the chamber 43 has a diameter which increases in the direction of the outlet section 42 of the pressure regulating device 1. This supports the guidance of the fluid flow when the valve element 10 is in the open position.

[0085] Preferably, it is provided that the first sealing element 31 and / or the second sealing element 32 is an O-ring and / or a sealing component having a lip section.

[0086] Furthermore, the head section 10' is arranged inside a receiving area 47 at the front side of the seat element 21 of the basic body 21, 22. In particular, it is provided that the head section 10' of the valve element 10 can be displaced within the receiving area 47 along the translation direction T. In particular, it is provided that the receiving area 47 at the outlet section 42 is filled with fluid when the valve element 10 is in the closed position.

[0087] Furthermore, it is provided that the outer side of the core element 22 has a stepped course in the inlet section 41 , which preferably forms a stop for a translational movement of the valve element 10 in a direction parallel to the translational direction T.

[0088] In order to seal the receiving area 47 with respect to the outside, it is provided that the seat element 21 and / or the head section 10 ′ of the valve element 10 has a third sealing element 33. The third sealing element 33 surrounds the head section 10 ′ of the valve element 10 and is preferably integrated into a corresponding recess, which is formed at the outer side wall of the valve element 10 and / or at the inner side wall of the seat element 21, in particular in the receiving area 47.

[0089] Furthermore, it is provided that the fourth sealing element 34 seals the core element 22 and the seat element 21 to prevent the fluid from leaving the pressure regulating device 1 via the joint section between the core element 22 and the seat element 21 of the basic body 21, 22. Establishing the basic body 21, 22 by fixing the core element 22 and the seat element 21 to each other, preferably permanently fixing them to each other, simplifies the assembly process of the pressure regulating device 1, because this allows the valve element 10 to be pulled onto the core element 22, in particular at the front side, the outlet section of the core element 22 in the finished state or assembled state. After the valve element 10 is pulled onto the core element 22, the valve element 10 can be displaced to its desired position. Subsequently, the seat element 21 can be pulled onto the same section or the front side of the core element 22 and can be connected to the core element 22, preferably permanently connected to the core element 22.

[0090] exist Figure 6 In the figure, Figure 2 Detailed view of the embodiment of the present invention. The detailed view shows a section including the cavity 43, the first sealing element 31 and the second sealing element 32 when the valve element 10 is in the closed position. In particular, the results show that when the first sealing area 51 has a first inner cross section and the second sealing area 52 has a second inner cross section, the first inner cross section and the second inner cross section correspond to each other in size and / or shape, the force caused by the inlet pressure change and acting on the valve element 10 can be reduced or eliminated.

[0091] Preferably, it is provided that the first diameter D1 in the first sealing area 51 corresponds to the second diameter D2 in the second sealing area 52. In the illustrated embodiment, this correspondence is achieved by the correspondence of the diameter and / or specific shape of the inner wall of the valve element 10 in the region of the shaft section 10' with the cross section and / or diameter of the regulating opening 49 at the front side of the valve element 10 on the one hand. However, this also applies to cross sections that are different from circular cross sections. In this case, the first extension and the second extension correspond to each other, and the first extension and the second extension are both the maximum extensions of the corresponding cross sections. Preferably, the first sealing area 51 and the second sealing area 52 have cross-sectional geometries that correspond to each other. For example, both cross sections are circular, elliptical and / or rectangular, and in particular have the same size, i.e., area. It can also be envisioned that in the case of an asymmetric cross section, the orientation of the cross section is different, so that the cross section is not flush with each other in a direction parallel to the translation direction T.

[0092] Preferably, it is provided that the first sealing element 31 and / or the second sealing element 32 is part of the core element 22. In particular, the outer side of the core element 22 has a recess and / or a profiled section intended to receive the first sealing element 31 and / or the second sealing element 32.

[0093] Furthermore, it is provided that the core element 22 passes through the receiving area 47, the seat element 21 and the valve element 10. In particular, it is provided that the core element 22 comprises a channel 40 for conveying a fluid from an inlet section 41 to an outlet section 42 of the pressure regulating device 1 .

[0094] Preferably, it is provided that the outer diameter of the core element 11 in the outlet section 42 is smaller than the outer diameter of the core element 21 in the inlet section 41 .

[0095] exist Figure 7 , the pressure regulating device 1 according to the second preferred embodiment of the present invention is illustrated when the valve element 10 is in the closed position. In general, Figure 4 The implementation method generally corresponds to Figure 1 , Figure 2 and Figure 3 However, in Figure 4 In the embodiment of the present invention, the nut element 24 is not directly connected to the core element 22 of the basic body 21, 22, but is connected to the inner side of the front section of the seat element 21 of the basic body 21, 22. In other words, the nut element 24 formed as an adjustment screw in the illustrated embodiment is arranged at the end section of the receiving area 47 of the seat element 21. Therefore, the spring element 28 can be covered and protected from environmental influences. In addition, the first sealing element 41 is composed of an annular element with a sealing lip protruding from the annular element.

[0096] exist Figure 8 , a pressure regulating device 1 according to a third preferred embodiment is shown. Figure 5 The pressure regulating device 1 and Figures 1 to 4 The only difference of the embodiment of is that it avoids the seat element 21 as part of the basic body 21, 22. Instead, the pressure regulating device 1 is formed by the valve element 10 and the core element 22, which is a shaft-like body, which extends substantially along the translation direction T. In order to avoid the need Figures 1 to 4 In the embodiment of the present invention, the valve element 10, in particular the head section 10' of the valve element 10, surrounds the core element 22 in both the inlet section 41 and the outlet section 42 of the pressure regulating device 1. In contrast, Figures 1 to 4 The valve element 10 in the embodiment of the present invention is substantially part of the inlet section 41 of the pressure regulating device 1 and is assigned to the inlet section 41. In order to establish the second sealing section 52, the head section 10' of the valve element 10 includes a sealing body 36, which protrudes inwardly from the inner side of the head section 10'. In the closed position, the sealing body 36 contacts the second sealing element 32 to separate the inlet section 41 from the outlet section 42. In order to also surround the core element 22 in the outlet section 42, the valve element 10 includes a side wall 35, which extends from the sealing body 36 in a direction parallel to the translation direction T. Preferably, the length of the side wall 35 protruding from the sealing body 36 is greater than or greater than the length of the head section 10' without the protruding side wall 35. Therefore, the protruding side wall 35 can extend far enough to form a further cavity 43' between the valve element 10 and the core element 22, which is assigned to the outlet section 42. In particular, it is provided that, in the open position, fluid can be transferred from the chamber 43 to the further chamber 43 ′ and subsequently via the further opening 48 into the second part 40 ″ incorporated into the channel 40 .

[0097] In order to seal the further cavity 43, the fourth sealing element 34 is arranged between the head section 10' of the valve element 10 and the core element 22. Preferably, the outer side of the core element 22 comprises a recess for arranging the fourth sealing element 34 in the recess. Figure 5 In the embodiment of the present invention, the fourth sealing element 34 having a lip section contacts the inner side of the valve element 10 to seal the inner side of the valve element 10, in particular, contacts the protruding side wall 35 thereof to seal the side 35. Preferably, the side wall 35 forms a hollow section, in particular a cylindrical section for receiving the core element 22.

[0098] also, Figure 5 An embodiment of the inlet section comprises a fixing means 44 for abutting or supporting the spring element 28. In particular, the fixing means 44 of the inlet section is a part of a screw nut or a screw mechanism for adjusting or regulating the restoring force of the spring element 28 used in the pressure regulating device 1.

[0099] Furthermore, the fixing element 44 arranged inside the outlet section 42 can serve as a stop for the valve element 10 which can be displaced along the translation direction T in order to transfer the pressure regulating device 1 between the open position and the closed position.

[0100] In particular, it is provided that the valve element 10 surrounds a section comprising the first sealing element 31, the second sealing element 32 and the fourth sealing element 34 and in particular the cavity 43 and the further cavity 43'. By using only the core element 22 and the valve element 10 to provide the pressure regulation 1, the compactness of the pressure regulating device 1 can be increased, which simplifies its introduction into the supply line system.

[0101] exist Fig. 9 , another embodiment of a pressure regulating device 1 for a powder-gas injection device is shown, which pressure regulating device 1 is particularly incorporated into the handpiece proposed by the present invention. This pressure regulating device 1 generally corresponds to the pressure regulating device 1 specified and discussed in the previous figures, but it includes, for example, more radially extending side walls. In addition, although no biasing member is included, a person skilled in the art will appreciate that such a biasing member can be incorporated in such a pressure regulating device 1 for moving the valve element 10.

[0102] Reference numerals

[0103] 1. Pressure regulating device

[0104] 10 Valve components

[0105] 10' head section

[0106] 10" shaft section

[0107] 11 Handpiece

[0108] 14 Mixing chamber

[0109] 16 Supply pipeline

[0110] 17 Nozzle element

[0111] 21 Seat components

[0112] 22 core components

[0113] 24 nut element

[0114] 28 Spring element

[0115] 31 first sealing element

[0116] 32 Second sealing element

[0117] 33 Third sealing element

[0118] 34 Fourth sealing element

[0119] 35 side wall

[0120] 36 Sealing body

[0121] 40 channels

[0122] 40' Part 1

[0123] 40" Part 2

[0124] 41 Entrance Section / Entrance

[0125] 42Exit section / exit

[0126] 43 chambers

[0127] 44Fixed Devices

[0128] 45 medial part

[0129] 46 openings

[0130] 47 Reception Area

[0131] 48 Another opening

[0132] 49 Adjustment opening

[0133] 51 First sealing area

[0134] 52 Second sealing area

[0135] 60 Gas source

[0136] 61 terminal

[0137] 100 Powder-gas injection device

[0138] D1 first diameter

[0139] D2 Second diameter

Claims

1. A system (100) for generating a powder-gas jet to perform a dental treatment, wherein: The system (100) is configured to be connected to a dentist's chair via a connection, wherein the connection of the system (100) to the dentist's chair allows the system (100) to be supplied with a pressurized gas flow, the system (100) comprising a compressed gas circuit, the compressed gas circuit being configured to direct the pressurized gas flow into a powder-gas mixing chamber (14) to form a gas-powder mixture, the system (100) being characterized in that the compressed gas circuit comprises at least a pressure regulating device (30) having an inlet (41) and an outlet (42), the regulating device (30) being configured to provide the pressurized gas flow at the outlet (42) of the pressure regulating device with a pressure that is independent of the pressure of the gas flow at the inlet (41) of the pressure regulating device when the regulating device is supplied with a pressurized gas flow.

2. The system (100) according to claim 1, wherein: The regulating device (3'0) is a pressure regulator, in particular a pressure reducing regulator, which is configured to provide a pressure at its outlet (42) for the pressurized gas flow that is independent of the pressure of the gas flow at its inlet (41) when the pressure regulator is supplied with the pressurized gas flow.

3. System (100) according to one of the preceding claims, characterized in that The pressure of the gas flow at the outlet (42) of the pressure regulating device (30) is independent of any changes in the pressure of the gas flow at the inlet (41).

4. The system (100) according to any one of claims 1 to 3, characterized in that: The system (100) comprises a handpiece (11) comprising a nozzle for ejecting a powder-gas mixture, the handpiece (11) being configured to be connected to the dentist's chair via a supply line (15), the supply line (15) being designed to supply at least a gas flow to the handpiece (11).

5. The system (100) according to claim 4, characterized in that The powder chamber (14) is integrated into the handpiece (11).

6. The system (100) according to claim 4 or 5, characterized in that The pressure regulating device (30) is integrated into the handpiece (11).

7. The system (100) according to claim 4 or 5, characterized in that The system comprises a supply line (16), wherein the supply line (16) is combined with the pressure regulating device (30).

8. The system (100) according to any one of claims 1 to 7, characterized in that The pressure regulating device (30) is configured to adjust the ratio between the pressure at the inlet (41) and the pressure at the outlet (42).

9. The system (100) according to one of the preceding claims, wherein: The pressure regulating device (30) comprises: - basic ontology (21, 22); and - a valve element (10), the valve element (10) being movable relative to the base body (21, 22) between an open position and a closed position, wherein, when the valve element (10) is in the closed position, the valve element (10) separates an inlet section (41) of the pressure regulating device (1) from an outlet section (42) of the pressure regulating device (1), and wherein, when the valve element (10) is in the open position, a fluid can be transferred from the inlet section (41) to the outlet section (42).

10. The system (100) according to claim 9, wherein: The pressure regulating device is configured such that when the valve element (10) is in the closed position, the fluid in the inlet section (41) generates a force acting on the valve element (10), and wherein a force in the outlet section (42) acts on the valve element (10), these forces compensating each other.

11. The system (100) according to claim 9 or 10, wherein: The valve element (10) contacts the basic body (21, 22) in a first sealing area (51) in the inlet section (41) of the pressure regulating device (1) and in a second sealing area (52), the second sealing area (52) being established in the closed position and intended to seal the inlet section (41) relative to the outlet section (42), wherein a first internal cross-section of the valve element (10) in the first sealing area (51) corresponds, in particular in terms of size cross-sectional surface and / or shape, to a second internal cross-section of the valve element (10) in the second sealing area (52), wherein preferably, the ratio of the difference between the first extension of the first internal cross-section and the second extension of the second internal cross-section to the average value of the first extension and the second extension is less than 0.2, preferably less than 0.1 and most preferably less than 0.

05.

12. The system (100) according to claims 9 to 11, wherein: The basic body (21, 22), in particular the core element (22) of the basic body (21, 22), comprises a channel (40) having a first part (40') located in the inlet section (41) and a second part (40") located in the outlet section (42).

13. The system (100) according to one of claims 9 to 12, wherein: The valve element (10) at least partially surrounds the basic body (20, 21), and a cavity (40) is formed between an inner side (45) of the valve element (10) and the basic body (21, 22), wherein in the open position of the valve element (10), the fluid is conveyed from the inlet section (41) to the outlet section (42) through the cavity (43), wherein the basic body (20, 21) preferably has an opening (46) fluidically connected to the cavity (43), wherein, preferably, when the valve element (10) is in the closed position, the cavity (43) is formed between the first sealing area (51) and the second sealing area (51).

14. The system (100) according to one of claims 9 to 13, wherein: The basic body (21, 22) is formed by a core element (22), and wherein the valve element (10) surrounds the core element (22) both in the inlet section (41) and in the outlet section (42), wherein in the outlet section (42) a further cavity (43') is formed between the valve element (10) and the core element (22).

15. System (100) according to one of the preceding claims, wherein: The pressure regulating device (30) comprises a membrane or a sliding seal which is mechanically connected to a movable valve element.

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