Abstract
A system for producing a powder-gas jet for performing a dental treatment, wherein the system is configured for being connected to a dentist chair by a connection, wherein the connection of the system to the dentist chair allows the system to be fed by 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, the system being wherein the compressed gas circuit comprises at least a pressure regulation device having an inlet and an outlet, the regulation device being configured to provide the pressurized gas flow with a pressure at its outlet that is independent of the pressure of the gas flow at its inlet, when it is fed by the pressurized gas flow.
Claims
1. A system for producing a powder-gas jet for performing a dental treatment, wherein the system is configured for being connected to a dentist chair by a connection, wherein the connection of the system to the dentist chair allows the system to be fed by 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, the system being wherein the compressed gas circuit comprises at least a pressure regulation device having an inlet and an outlet, the regulation device being configured to provide the pressurized gas flow with a pressure at its outlet that is independent of the pressure of the gas flow at its inlet, when it is fed by the pressurized gas flow.
2. The system according to claim 1, wherein the regulation device is a pressure regulator, in particular a pressure reducing regulator, the pressure regulator being configured to provide the pressurized gas flow with a pressure at its outlet that is independent of the pressure of the gas flow at its inlet, when it is fed by the pressurized gas flow.
3. The system according to claim 1 wherein the pressure of the gas flow at the outlet of the pressure regulation device is independent from any variation of pressure of the gas flow at the inlet.
4. The system according to any one of claim 1, wherein the system comprises a handpiece comprising a nozzle for ejecting the powder-gas mixture, the handpiece being configured for being connected to the dentist chair through a supply line designed for supplying at least a gas flow to the handpiece.
5. The system according to claim 4, wherein the powder chamber is incorporated into the handpiece.
6. The system according to claim 4, wherein the pressure regulation device is incorporated into the handpiece.
7. The system according to claim 4, wherein the system comprises the supply line, wherein the supply line incorporates the pressure regulation device.
8. The system according to claim 1, wherein the pressure regulation device is configured to adapt a ratio between the pressure at the inlet and the pressure at the outlet.
9. The system according claim 1, wherein the pressure regulation device comprises a basic body and a valve element, which can be moved relative to the basic body between an open position and a closed position, wherein the valve element separates an inlet section of the pressure regulation device from an outlet section of the pressure regulation device, when the valve element is in the closed position, and wherein a fluid can be transferred from the inlet section to the outlet section, when the valve element is in the open position.
10. The system according to claim 9, wherein the pressure regulation device is configured such that, when the valve element is in the closed position, the fluid in the inlet section generates forces, which act on the valve element and wherein the forces in the outlet section, acting on the valve element, compensate each other.
11. The system according to claim 9, wherein the valve element contacts the basic body in a first sealing region, being located in the inlet section of the pressure regulation device, and in a second sealing region, the second sealing region being established in the closed position and being intended for sealing the inlet section from the outlet section, wherein a first inner cross section of the valve element in the first sealing region corresponds to a second inner cross section of the valve element in the second sealing region in particular with respect to size cross-section surface and/or shape, wherein a ratio between the difference between a first extension of the first inner cross section and a second extension of the second inner cross section to a mean of the first extension and the second extension has a value, being smaller than 0.2.
12. The system according to claims 9, wherein the basic body, in particular a core element of the basic body, includes a channel having a first part in the inlet section and a second part in the outlet section.
13. The system according to claims 9, wherein the valve element surrounds at least partially the basic body and a cavity is formed between an inner side of the valve element and the basic body, the fluid passing the cavity in the open position of the valve element for being transported from the inlet section to the outlet section, wherein the basic body has an opening, being in fluid connection with the cavity, wherein the cavity is formed between the first sealing region and the second sealing region, when the valve element is in the closed position.
14. The system according to claim 9, wherein the basic body (21,22) is formed by a core element and wherein the valve element surrounds the core element in both the inlet section and the outlet section, a further cavity being formed between the valve element and the core element in the outlet section.
15. The system according to claim 1, wherein the pressure regulation device comprises a membrane or a sliding seal, being mechanically connected to a moveable valve element.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0053] In the drawings is:
[0054] FIG. 1 shows a system including a powder gas jet device according to a first preferred embodiment according to the present disclosure
[0055] FIG. 2 shows a system including a powder gas jet device according to a second preferred embodiment according to the present disclosure
[0056] FIG. 3 shows the effect of a pressure regulation device compared to a flow regulation device
[0057] FIG. 4 shows a first exemplary version of a pressure regulation device used in a system according to the present disclosure in an open state,
[0058] FIG. 5 shows the first exemplary version of a pressure regulation device used in the system jet device according to the present disclosure in an closed state,
[0059] FIG. 6 shows a detail view of FIG. 5
[0060] FIG. 7 shows a cross sectional view of a second exemplary version of a pressure regulation device used in the system jet device according to the present disclosure, when the valve element is in the closed position
[0061] FIG. 8 shows a cross sectional view of a third exemplary version of a pressure regulation device used in a powder gas jet device according to the present disclosure, when the valve element is in a closed position and
[0062] FIG. 9 shows a cross sectional view of a fourth exemplary version of a pressure regulation device used in the system according to the present disclosure, when the valve element is in a closed position.
DETAILED DESCRIPTION
[0063] In FIG. 1 a system 100 including a powder gas jet device according to a preferred embodiment of the present disclosure is presented. Those powder gas jet devices are preferably used for removing stains, tartar or a coloration from a tooth and/or for removing dental biofilms, in particular by an air polishing method by using abrasive particles. The powder gas jet device provides an output stream that is able to remove stains and coloration and/or to remove dental biofilms. In operation, the output stream is ejected by a nozzle element 17 at its front end.
[0064] In the embodiment of FIG. 1, the powder gas jet device comprises a handpiece 11 having a nozzle element 17. Especially, the handpiece 11 includes a mixing chamber 14, i.e. a powder-gas-mixing chamber 14, being incorporated into the handpiece 11. Such handpieces 11, being used for air polishing teeth by abrasive particles, are also well known as handy. Such handpieces 11 are preferably connected via a supply line 16 with a gas pressure source 60. The supply line 16 might 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 provided and configured to realize the powder gas mixture, being ejected by 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 the powder gas mixture inside the mixing chamber 14.
[0065] Especially, the handpiece 11 being illustrated in FIG. 1 is reversibly connected to the gas pressure source 60 at a terminal 61 of the gas pressure source 60. In particular, it is provided that an assembly comprising the handpiece 11 and the supply line 16 can be removably attached to the terminal 61, such that the gas pressure source 60 can also be used for other, especially, 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 kinds of dental treatment systems and/or devices. Such a gas source or gas pressure source 60 might have a compressor and/or turbine to provide a gas at a determined level, in particular at a level being larger than the level required for operating the powder gas jet device. It might even be possible that the gas pressure source 60 comprises a regulation device for setting and determining the pressure level at the output or outlet of the gas pressure source 60, in particular at the terminal 61. In the prior art, it was usually necessary that the operator adjusts the pressure level at the gas pressure source 60, when they attach the handpiece 11, being intended for air polishing. This is especially necessary, since the gas pressure sources 60, being typically used provide gas at a pressure level being significantly higher than the pressure level being needed in case of operating a powder gas jet device.
[0066] As a result, the operator was forced in the prior art to perform this complicated adaption, creating effort and a loss of time. Contrary to this, it is preferably provided that a pressure regulation device 1 is included into the supply line 16 and/or the handpiece 11, the pressure regulation device 1 having an inlet 41 and an outlet 42. The pressure regulation device 1 is especially configured to create a fixed and determined pressure level at its outlet 42, independent of the size of the pressure level at its input 41. The functionality of setting the pressure level to a determined and/or desired pressure level at the outlet/output 42 especially applies when the pressure level at the input 41 of the regulation device 1 exceeds a threshold.
[0067] In case of attaching the handpiece 11 to the general gas pressure source 60, the desired output level of the pressurized gas will be automatically set due to the pressure regulation device 1, independent of the gas being provided by the gas pressure source 60. In other words: The operator can just plug in the handpiece 11, in particular by using the supply line 16, to the terminal 61 without spending time on adapting the pressure level by adjusting the pressure level at the gas pressure source 60. This significantly simplifies the exchange and the attachment of the handpiece 11 being used for air polishing. For example, the gas pressure source 60 is incorporated into a chair system, being also used for carrying dental instruments and preferably additionally including supply lines for providing electrical energy and/or materials, such as gas and/or water.
[0068] In the embodiment being shown in FIG. 1, the powder gas jet device comprises a pressure regulation device 1, being formed as an adapter, being arranged, preferably interchangeably, between the handpiece 11 and the supply line 16. For example, it is conceivable that the pressure regulation device 30 has interfaces, being adapted to the interface between the supply line 16 and the handpiece 11, such that the pressure regulation device 1, being formed as adapter, can just be added to the system 100 by plugging it into the system 100, between the handpiece 11 and the supply line 16. Thus, it might even be possible to upgrade powder gas jet devices of the prior art by incorporating pressure regulation devices 1 into them.
[0069] Furthermore, it is conceivable that the pressure regulation device 1, especially the adapter, comprises an adjustment element, being configured to set the pressure level at the output 42 of the pressure regulation device 1. Thus, it is possible to provide a means for a fine adjustment of the output level of the pressurized gas at the outlet 42 of the pressure regulation device 1. For example, it might be reasonable to change by the adjustment element a biasing force of a biasing member, being part of the pressure regulation device 1. This will be explained in more detail in context of the FIGS. 4 to 9. The adjustment element might be realized as a ring being rotated for performing the fine adjustment.
[0070] The embodiment illustrated in FIG. 2 mainly corresponds to the embodiment of FIG. 1. The main difference between FIG. 1 and FIG. 2 is that the pressure regulation device 1 is incorporated into the handpiece 11, in particular into a grip section of the handpiece 11, in particular upstream to the mixing chamber 14. Such an incorporation makes a specific compact design necessary and it turned out that especially the pressure regulation device 1, being discussed in detail in the embodiment of the FIGS. 4 to 9, is such compact that it can be incorporated into the handpiece 11 without enlarging the dimensions of the handpiece 11.
[0071] In FIG. 3, a graphic is illustrated, showing the dependency of the pressure inside the mixing chamber 14 in dependency of the pressure at the inlet 41 of the pressure regulation device 1, i.e. the pressure level existing at the terminal 61 of the gas pressure source 60. Especially, the graphic compares the case of a powder gas jet device, having a pressure regulation device 1 (see lines having references C and D) on the one hand and of a powder gas jet device, having a flow regulation device on the other hand (see lines having references A and B). Such flow regulation devices are also known for regulating the output stream, being ejected from the nozzle element 17 of the powder gas jet device. Although these devices can regulate the flow rate of the ejected powder gas mixture, they are unable to limit the pressure level at the outlet. The greater the pressure at the inlet of the flow regulation device is, the greater the pressure in the mixing chamber 14. In contrast to that, the pressure regulation device 1 is for example configured to create a constant pressure level at its outlet 42, when the pressure level at the inlet 41 exceeds a value, being for example larger than 2.5 bar, preferably larger than 3.5 bar and more preferably larger than 4 bar. In this case, the pressure level at the outlet 42 mainly maintains constant independent of the size of the pressure level at the inlet side 41 of the pressure regulation device 1. The graphic shows both the static (B, D) and the dynamic (C, A) pressure behaviors of the two systems, i.e. the pressure regulation device 1 on the one hand and the flow regulation device on the other hand.
[0072] As a consequence of using a pressure regulation device 1, it is advantageously possible to control the powder flow rate and therefore the treatment efficiency in a more precise way, compared to the approaches being known in the prior art, for example, by using a flow rate device. Furthermore, a risk of emphysema, especially in case of a subgingival treatment, is decreased compared to the approaches of the prior art without having a pressure regulation device 1.
[0073] As already mentioned, the pressure regulation devices 1 of the FIGS. 4 to 9 are of benefit, especially since the pressure level at the outlet section/outlet 42 of the pressure regulation device 1 is less sensitive with respect to small variations of the pressure level at the inlet section/inlet 41. Furthermore, only a single moving valve element 10, i.e. plunger element, is used, which allows a compact design while preserving low pressure drops. Due to the comparably big flow sections through a radial opening 46 and a further opening 48 and annular seat geometry, the compactness is further improved. Furthermore, the number of sealing areas can be reduced by using a pressure regulation device as being discussed in the FIGS. 4 to 9 for minimizing the probability of a leak and for reducing friction. This also reduces a hysteresis-effect, being established otherwise after a certain number of operation cycles.
[0074] In addition, the pressure regulation 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 of precise adjustments and a setting between parts.
[0075] FIG. 4 shows a cross sectional view of a pressure regulation device 1 according to a first preferred embodiment of the present disclosure, in particular, when a valve element 10 is in an open position. A pressure regulation device 1 is preferably a valve, which controls the pressure of a fluid to a desired value. Such a pressure regulation device 1 is typically included in a pipeline system and/or at an outlet of a fluid source. The fluid might be a liquid or a gas. The pressure regulation device 1, being discussed here, is preferably a part of a dental treatment apparatus, such as a powder jet device or a scaler device. Preferably, the pressure regulation device 1 is a pressure-reducing regulation device and/or is free of a membrane, which is used in pressure regulation devices 1 of the prior art. Essential parts of the pressure regulation device 1 is a basic body 21, 22 and a valve element 10, wherein the valve element 10 can be moved or shifted between an open position and a closed position. In the embodiment illustrated in FIG. 1, the basic body 21, 22 is formed by two components, i.e. a core element 22 and a seat element 21. In the illustrated embodiment the core element 22 and the seat element 22 are fixed to each other permanently by a positive, material and/or frictional fitting. It is also conceivable that core element 22 and seat element 21 are formed by a single integral component.
[0076] The valve element 10 can be moved relative to the basic body 21, 22 between the open position and closed position, wherein the valve element 10 separates an inlet section 41 of the pressure regulation device 1 and an outlet section 42 of the pressure regulation device 1, when the valve element 10 is in the closed position and wherein a fluid can be transferred from the inlet section 41 to the outlet section 42, when the valve element 10 is in the open position. FIG. 1 illustrates the pressure regulation device 1, when the valve element 10 is in the open position. As a consequence, the fluid streams from the inlet section 41 of the pressure regulation device 1 to the outlet section 42 of the regulation device 1. In such a scenario, the outlet section 42 can use the newly introduced fluid for increasing the pressure until the desired pressure is reached. The pressure generated in the outlet section 42 automatically causes a movement of the valve element 10 from the closed position to the open position, when an outlet pressure, i.e. the pressure as the outlet section 42, overcomes the restoring force of a spring element 28, which biases the valve element 10 relative to the basic body 21, 22. Thereby, the valve element 10 is moved preferably by a translation movement along a direction being parallel to the translation direction T.
[0077] Especially, it is provided that the valve element 10 has a shaft section 10 and a head section 10. In the assembled state, the valve element 10 surrounds the core element 22 in the illustrated embodiment of FIG. 1, the core element 22 particularly being formed as a shaft. As a consequence, it is possible that the valve element 10 can be shifted along the longitudinal direction of the core element 22 of the basic body 21, 22 for being moved 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. Especially, the shaft region 10 of the valve element 10 is arranged coaxial to the longitudinal direction of the core element 22 or the outer wall side of the core element 22 in the inlet section 41. Especially, the valve element 10 is guided by the shaft section 10 of the valve element 10 and the outside of the core element 22, in particular in the inlet section 41 of the pressure regulation device 1.
[0078] Furthermore, the valve element 10 includes a head section 10, the head section 10 having an increased inner diameter compared to the inner diameter of the shaft section 10 of the valve element 10. The valve element 10 has preferably a plunger like shape. Especially, it is provided that in the head section 10 of the valve element 10 the inner side of the valve element 10 forms a cavity 43, which is passed by the fluid, when the valve element 10 is in the open position, as illustrated in FIG. 1. Especially, it is provided that the cavity 43 is formed by the inner side of the valve element 10 and an outer sider of the core element 22 of the basic body 21, 22. Especially, the cavity 43 is in fluid communication with a first part 40 of a channel 40, being included into the core element 22 of the basic body 21, 22. Especially, it is provided that the core element 22 has an opening 46, the fluid passing the opening 46 for exiting a first part 40 of the channel 40 and entering the cavity 43. The fluid exits the cavity 43 via a regulation opening 49 at a front end of a valve element 10, when the valve element 10 is in the open position. Especially, it is provided that the core element 22 has a tapered diameter along the longitudinal direction in this region, which is intended to be open or closed for regulating the stream of the fluid. The fluid, which bypasses the outside of the core element 22, re-enters into a second part 40 of the channel 40, being incorporated into the core element 22 of the basic body 21, 22 via a further opening 48, the further opening 48 being part of the outlet section 42 of the pressure regulation device 1.
[0079] Preferably, the pressure regulation device 1 is a membrane-free pressure regulation device 1.
[0080] For adjusting the movement of the valve element 10, such that the desired pressure is established in the outlet section 42 of the pressure regulation device 1, the spring element 28 is connected to the basic body 21, 22, in particular to the core element 22 of the basic body 21, 22 via a nut element 24. By rotating the nut element 24 or shifting the nut element 24 along the direction being parallel to the longitudinal direction of the core element 22 or being parallel to the translation direction T of the valve element 10 during its transfer between the open position and the closed position, the restoring force for the spring element 28 can be adapted and therefore, the force or pressure, which is needed for shifting the valve element 10 from the closed position to the open position, can be adapted.
[0081] In FIG. 5 the pressure regulation device 1 of FIG. 1 is illustrated, when the valve element 10 is in the closed position. In this closed position, the cavity 43 is filled with the fluid at a pressure of the inlet section 41 of the pressure regulation device 1. Especially, the cavity 43 is formed between a first sealing element 31 and a second sealing element 32, being in the closed position in contact with the valve element 10, in particular an outer rim of the regulation opening 49 at the front side of the valve element 10 for sealing the inlet section 41 from the outlet section 42. As a consequence, a second sealing region 52 is formed, when the valve element 10 is in the closed position. The first sealing region 51 is formed between the shaft section 10 of the valve element 10 and the outside of the core element 22, the outside being arranged next to the inside or inner wall of the shaft section 10 of the valve element 10. Especially, 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. By the specific design of the cavity 43, which preferably surrounds the core element 22, in particular completely, it is possible that forces are generated by the pressure inside the inlet section 41, which acts on the valve element 10, in particular on the inner side wall of the head section 10, of the valve element 10 and compensate each other.
[0082] Preferably, it is provided that the cavity 43 has an increasing diameter towards the direction to the outlet section 42 of the pressure regulation device 1. This supports a guiding of the fluid stream, when the valve element 10 is in the open position.
[0083] Preferably, it is provided that the first sealing element 31 and/or the second sealing element 32 is an O-rings and/or sealing component having a lip section.
[0084] Furthermore, the head section 10 is arranged inside a receiving region 47 at a 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 shifted along the translation direction T within the receiving region 47. Especially, it is provided that the receiving region 47 at the outlet section 42 is filled with the fluid, when the valve element 10 is in the closed position.
[0085] Furthermore, it is provided that the outer side of the core element 22 has a step-like course in the inlet section 41, the step-like course forming preferably a stop for the translation movement of the valve element 10 in a direction being parallel to the translation direction T.
[0086] For sealing the receiving region 47 from 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 incorporated into a corresponding recess, being formed at the outer side wall of the valve element 10 and/or the inner side wall of the seat element 21, in particular in the receiving region 47.
[0087] Furthermore, it is provided that a fourth sealing element 34 seals the core element 22 and the seat element 21 for hindering the fluid from exiting the pressure regulation device 1 via the interface 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, simplifies the assembling process of the pressure regulation device 1, since this allows pulling the valve element 10 over the core element 22, in particular at the front side of the core element 22 being in the finished state or assembled state the outlet section. After pulling the valve element 10 on the core element 22, it is possible to shift the valve element 10 to its desired position. Subsequently, the seat element 21 can be pulled over the same section or front side of the core element 22 and can be connected to the core element 22, preferably permanently.
[0088] In FIG. 6, a detailed view of FIG. 2 is illustrated. The detailed view shows the 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. Especially, it turned out, that it is possible to reduce or eliminate the forces, being caused by inlet pressure variations and acting on the valve element 10, when a first sealing region 51 has a first inner cross section and a second sealing region 52 has a second inner cross section, the first inner cross section and the second inner cross section corresponding to each other with respect to their size and/or shape.
[0089] Preferably, it is provided that a first diameter D1 in the first sealing region 51 corresponds to a second diameter D2 in the second sealing region 52. In the illustrated embodiment, this correspondence is realised by a correspondence of the diameters and/or a specific shape of the inner wall of the valve element 10 in the region of the shaft section 10 on the one hand and the cross section and/or diameter of the regulation opening 49 at the front side of the valve element 10. However, this applies also for cross sections being different from a circular cross section. In this case a first extension and a second extension correspond to each other, the first extension and the second extension being each the maximum extension of the respective cross sections. Preferably, the first sealing region 51 and the second sealing region 52 have cross section geometries, which correspond to each other. For example, both cross sections are circular, elliptic and/or rectangular, in particular having the same dimensions, i.e. areas. It is also conceivable that in case of an asymmetric cross section the cross sections are orientated differently such that they are not flush to each other in a direction being parallel to the translation direction T.
[0090] Preferably, it is provided that the first sealing element 31 and/or the second sealing element 32 are part of the core element 22. In particular, the outer side of the core element 22 has recesses and/or profiled sections, which are intended to receive the first sealing element 31 and/or second sealing element 32.
[0091] Furthermore, it is provided that the core element 22 passes through the receiving region 47, the seat element 21 and the valve element 10. In particular, it is provided that the core element 22 includes the channel 40, for transporting the fluid from the inlet section 41 to the outlet section 42 of the pressure regulation device 1.
[0092] Preferably, it is provided that the core element 11 has an outer diameter in the outlet section 42, being smaller than the outer diameter of the core element 21 in the inlet section 41.
[0093] In FIG. 7, a pressure regulation device 1 according to a second preferred embodiment of the presented disclosure, is illustrated, when the valve element 10 is in the closed position. In general, the embodiment of FIG. 4 mainly corresponds to the embodiment of FIGS. 1, 2 and 3. However, the embodiment of FIG. 4, the nut element 24 is not directly connected to the core element 22 of the basic body 21, 22, but instead to an inner side of a front section of a seat element 21 of the basic body 21, 22. In other words, the nut element 24, being formed in the illustrated embodiment as a setting screw, is placed at an end section of the receiving region 47 of the seat element 21. As a consequence, it is possible to cover the spring element 28 and protect it from environmental influences. Furthermore, the first sealing element 41 is configured by a ringshaped element having a sealing lip protruding from the ring-shaped element.
[0094] In FIG. 8, a pressure regulation device 1 according to a third preferred embodiment is shown. The pressure regulation device 1 of FIG. 5 only distinguishes from the embodiments of the FIGS. 1 to 4 by avoiding a seat element 21, being part of the basic body 21, 22. Instead, the pressure regulation device 1 is formed by the valve element 10 and the core element 22, being a shaft-like body, which extends mainly along the translation direction T. For avoiding the need of a seat element 21, being included in the embodiments of FIGS. 1 to 4, the valve element 10, in particular its head section 10, surrounds the core element 22 both in the inlet section 41 and the outlet section 42 of the pressure regulation device 1. In contrast to that, the valve element 10 in the FIGS. 1 to 4 are mainly part and assigned to the inlet section 41 of the pressure regulation device 1. For establishing the second sealing section 52, the head section 10 of the valve element 10 includes a sealing body 36, protruding inwardly from the inside of the head section 10. In the closed position, the sealing body 36 contacts the second sealing element 32 for separating the inlet section 41 from the outlet section 42. For surrounding the core element 22 also in the outlet section 42, the valve element 10 includes a side wall 35, which extends from the sealing body 36 along a direction being parallel to the translation direction T. Preferably, the length of the side wall 35 protruding from the sealing body 36, is greater or larger than the length of the head section 10 without the protruding side wall 35. As a consequence, it is possible that the protruding side wall 35 extends far enough for forming a further cavity 43 between the valve element 10 and the core element 22, the further cavity 43 being assigned to the outlet section 42. In particular, it is provided that in the open position, fluid can be transferred from the cavity 43 to the further cavity 43 and subsequently, via the further opening 48, into the second part 40 being incorporated into the channel 40.
[0095] For sealing 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 includes a recess for arranging the fourth sealing element 34 inside this recess. This fourth sealing element 34 having a lip section in the embodiment of FIG. 5, contacts for sealing the inner side of the valve element 10, in particular its protruding side wall 35. Preferably, the side wall 35 forms a hollow section, in particular a cylindric section for receiving the core element 22.
[0096] Furthermore, the embodiment of FIG. 5 includes fixation means 44 for abutting or supporting the spring element 28. Especially, the fixation means 44 of the inlet section is part of the screwing nut or screwing mechanism for adjusting or adapting the restoring force of the spring element 28, being used in the pressure regulation device 1.
[0097] Furthermore, the fixation element 44, being arranged inside the outlet section 42 can be used as a stopper for the valve element 10, which can be shifted along the translation direction T for transferring the pressure regulation device 1 between the open and the closed position.
[0098] In particular, it is provided, that the valve element 10 surrounds a section, including 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 a core element 22 and a valve element 10 for providing the pressure regulation 1, it is possible to improve the compactness of the pressure regulation device 1, which simplifies its introduction into supply line systems.
[0099] In FIG. 9 another embodiment of a pressure regulation device 1 is shown for a powder gas jet device, in particular incorporated into the handpiece, being addressed by the present disclosure. The pressure regulation device 1 mainly corresponds to the pressure regulation devices 1 being specified and discussed in the previous figures, although it for example includes more side walls radially extending. Furthermore, the biasing member is not included but the skilled person will be aware that such a biasing member is incorporated in such a pressure regulation device 1 for moving the valve element 10.
