A dental spray gun and its usage method

Abstract

A dental spray gun and its usage method. The dental spray gun includes a nozzle head and an air inlet pipe. A nozzle, a handle, and a switch are provided on the nozzle head. The air inlet pipe is connected to an exhaust pipe line, and the exhaust pipe line is communicated with the nozzle. A heating element is provided on the exhaust pipe line. The switch is used to connect or disconnect the connection between the air inlet pipe and the exhaust pipe line. The method includes: opening the air source or water source, and the fluid enters the air inlet pipe; opening the switch, and the fluid flows from the air inlet pipe to the exhaust pipe line; turning on the heating element, the heating element heats the fluid in the exhaust pipe line, and the heated fluid is ejected from the nozzle. The present invention changes the traditional heating structure and method, so that the exhaust pipe line is always communicated with the external atmosphere through the nozzle, and the exhaust pipe line is an open space. No matter when the heating element provided inside or outside the exhaust pipe line is turned on, it always heats the fluid in the open space, avoiding the volume expansion of the fluid in the closed space from the root, significantly improving the comfort of the patient, and reducing the safety risk.

Description

Technical Field

[0001] The invention relates to the field of medical equipment, and in particular to a dental spray gun and a use method thereof. Background Art

[0002] Dental spray guns are commonly used tools for oral treatment of patients, usually with water spray, air jet, and spray functions. In winter, the lower ambient temperature makes the fluid sprayed by the spray gun low in temperature, and the low-temperature fluid can easily irritate the patient's wound surface, causing discomfort to the patient.

[0003] In order to increase the temperature of the fluid sprayed from the spray gun and reduce the stimulation to the patient's wound surface, the existing technology has conducted research on the fluid heating function of the dental spray gun.

[0004] Patent CN208876867U discloses a medical internally heated water-gas three-purpose spray gun, which has a heating element for heating the fluid built into the handle. When in use, the fluid is first passed into the heating part and heated to a preset temperature, and then the heated fluid is sprayed out for oral treatment.

[0005] Patent CN106236308B discloses a dental spray gun with water vapor heating function, which also has a heating key for heating fluid built into the handle to achieve the function of outputting hot air, hot water, and hot mist to meet clinical treatment needs. When in use, the fluid passage needs to be closed for heating, and after heating to a preset temperature, the fluid passage switch is opened to spray the heated fluid.

[0006] In the prior art, dental spray guns with heating functions need to be heated with the passage closed when in use, and the passage is opened to spray fluid only after heating to the required temperature. However, heating the fluid in a closed space will increase the volume of the fluid, increase the pressure in the closed space, and increase the flow rate at the nozzle when the fluid passage is opened, and the flow rate and temperature are unstable, which can easily cause discomfort to the patient; in addition, if there is a problem with the fluid temperature control, the fluid in the closed space will be heated to an excessively high temperature, causing damage to the spray gun, and in serious cases, medical accidents. Summary of the invention

[0007] The object of the present invention is to provide a dental spray gun and a method for using the same, so as to solve the problem that the dental spray gun with a heating function in the prior art needs to heat the fluid in a closed space before use, resulting in unstable flow rate and temperature at the nozzle outlet, which may cause discomfort to the patient and pose a safety hazard.

[0008] In the prior art, the heating method of patent CN208876867U is as follows: first, low-temperature water is introduced into the water channel, and low-temperature gas is introduced into the gas channel. Then, the low-temperature water and low-temperature gas are heated in the narrow enclosed space of the handle. When the preset temperature is reached, the control button is pressed to eject the heated water or gas. Taking patent CN106236308B as an example, when hot air is needed, the air switch button is pressed to conduct the air path, thereby making the air control electric switch conduct and power the air heating component for heating. After the heat instantaneously heats the gas to the set temperature, the gas is ejected through the gun head and the spray rod. Then, the switch button is released to stop heating.

[0009] It can be seen that although the dental spray gun with a heating function in the prior art can heat the ejected fluid, the heating process mainly heats the fluid in the enclosed space. After the heated liquid, gas or gas-liquid mixture expands in volume, the pressure in the enclosed space increases accordingly. At the moment when the fluid passage is conducted, the flow rate at the outlet suddenly increases, and the high-speed fluid impacts and stimulates the wound surface, causing discomfort to the patient. At the same time, since there is a difference in the heating time between the subsequent fluid and the fluid that starts to be ejected, a continuous and constant-temperature fluid cannot be formed. The fluid flow rate and temperature are both unstable, which will also make the patient feel uncomfortable. Moreover, during the entire heating process, there are potential safety hazards in the temperature control of the fluid in the prior art. Once there is a problem with the fluid temperature control, the fluid heated to a high temperature in the enclosed space is not only likely to damage the spray gun, but may even cause medical accidents in severe cases.

[0010] To solve the above problems, the inventor changed the heating idea and method of the fluid and designed a dental spray gun for heating the fluid in an open space.

[0011] The present invention is realized through the following technical solutions:

[0012] A dental spray gun includes a spray head and an air inlet pipe. A nozzle, a handle and a switch are arranged on the spray head. The air inlet pipe is connected with an exhaust pipe path, and the exhaust pipe path is communicated with the nozzle. A heating element is arranged on the exhaust pipe path, and the switch is used to connect and disconnect the connection between the air inlet pipe and the exhaust pipe path.

[0013] Similar to the prior art, this dental spray gun includes a spray head, on which a nozzle, a handle and a switch are arranged. It also includes an air inlet pipe, which is connected to an external gas source or water source, such as an air pump or a water pump, to introduce external fluid into the handle and control it with the switch, so that the fluid is finally ejected through the nozzle to the wound surface of the patient.

[0014] In the prior art, the air inlet pipe is connected to the nozzle and the heating element is arranged on the air inlet pipe. After the fluid is introduced into the air inlet pipe, the fluid is heated by the heating element.

[0015] This technical solution changes the traditional heating method. Specifically, an exhaust pipeline is provided between the intake pipe and the nozzle, one end of the exhaust pipeline is connected to the intake pipe, and the other end is connected to the nozzle. The heating element is used to heat the fluid in the exhaust pipeline instead of the fluid in the intake pipe, and the switch can connect or block the fluid flow between the intake pipe and the exhaust pipeline.

[0016] When in use, turn on the external gas source or water source, the switch is in the closed state, and the fluid enters the intake pipe for storage. Then turn on the switch and the heater, the heater heats the fluid in the exhaust pipe, and the fluid continues to be ejected through the nozzle during the heating process. In the above steps, the switch can be turned on before the heater, can be turned on later than the heater, or can be turned on at the same time. Preferably, the heater is turned on at the same time as the switch is turned on to reduce fluid loss or energy consumption. At the end, turn off the switch to block the fluid in the intake pipe from entering the exhaust pipe, and the exhaust pipe is emptied through the nozzle under the action of the internal pressure, and then turn off the heater. In some embodiments, the heater is a resistance wire.

[0017] Through the above-mentioned heating structure and method, the exhaust duct is always connected to the external atmosphere through the nozzle, and the exhaust duct is an open space. The heating element arranged inside or outside the exhaust duct always heats the fluid in the open space whenever it is turned on, thereby fundamentally avoiding the volume expansion of the fluid in the closed space. The fluid is ejected from the nozzle during the heating and constant temperature process, and the temperature and flow rate of the ejected fluid will not increase or decrease sharply. The continuous, uniform and constant temperature fluid acting on the wound surface can significantly improve the patient's comfort; in addition, even if the heating element and the temperature control component are abnormal, when the switch is turned off, the heating element only heats the gas in the pipeline, and the heated gas is connected to the outside atmosphere; when the switch is turned on, the fluid continues to take away part of the heat, which not only slows down the excessively fast heating rate of the heating element, but also the heating rate of the flowing fluid is slower than that of the fluid in the closed space. When the color of the thermal layer on the nozzle is observed to change significantly, the work can be stopped immediately and checked, which improves the reliability of the equipment and greatly reduces the safety risk.

[0018] As a preferred embodiment of the present invention, the exhaust pipeline includes a first exhaust pipe and a second exhaust pipe, wherein the first exhaust pipe is connected to the intake pipe, and the second exhaust pipe is connected to the nozzle, and a control pipeline is arranged between the first exhaust pipe and the second exhaust pipe, and the control pipeline is used to control the heating element to be turned on or off, and the heating element is used to heat the fluid in the second exhaust pipe.

[0019] The exhaust pipeline is divided into two sections, and a control pipeline is arranged between the two sections. Among them, the first exhaust pipe serves as the input end of the control pipeline, and the second exhaust pipe serves as the output end of the control pipeline. The principle of this scheme is: after turning on the switch, the fluid in the intake pipe enters the control pipeline through the first exhaust pipe, and the fluid triggers the heating element control switch in the control pipeline, thereby controlling the heating element to turn on and heat the second exhaust pipe. After that, the fluid in the control pipeline enters the second exhaust pipe, and is heated by the heating element during the flow process, and finally the heated fluid is ejected from the nozzle; after turning off the switch, the fluid is blocked in the intake pipe, and the remaining fluid in the first exhaust pipe is discharged under the action of the internal pressure. The heating element control switch is turned off after no fluid touches it, and the heating element stops heating. Through the above-mentioned arrangement, medical personnel can control the heating of the heating element and the opening and closing of the fluid pipeline only through the switch on the nozzle, which not only simplifies the operation of medical personnel and avoids the situation where the heating element is turned on but the fluid pipeline is not connected or the heating element is not turned on but the fluid pipeline is connected due to misoperation, but also heats only after the fluid pipeline is connected, reducing energy consumption.

[0020] Preferably, the fluid-triggered heating element control switch is a pneumatic electric switch or a water flow switch. Both the pneumatic electric switch and the water flow switch are prior art and are triggered by the passing gas and liquid, respectively.

[0021] As a preferred embodiment of the control pipeline, the control pipeline includes a tee and a control switch, the inlet end of the tee is connected to the first exhaust pipe, one outlet end of the tee is connected to the second exhaust pipe, the other outlet end of the tee is connected to the control switch, and the control switch is electrically connected to the heating element. The control switch and the heating element are electrically connected through a wire, and the wire can be set inside the pipeline or outside the pipeline. The fluid entering the control pipeline through the first exhaust pipe is divided at the tee, a small part of the fluid flows to the control switch and triggers the control switch to turn on, the heating element starts to heat the second exhaust pipe, and the remaining fluid enters the second exhaust pipe and is ejected from the nozzle after heating. Preferably, the length of the second exhaust pipe is longer than the distance between the tee and the control switch. In some embodiments, the length of the second exhaust pipe is 10 to 20 times the length of the distance between the tee and the control switch, so that after the heating element is turned on, the fluid passes through the heating element after the heating element is heated to a certain temperature, and then the fluid at the nozzle outlet has an initial temperature that is suitable for the wound surface, thereby reducing fluid waste and shortening the fluid heating time; and after the switch is closed, the fluid between the tee and the control switch is emptied first, the heating element stops heating, and the fluid in the second exhaust pipe can gradually take away the temperature in the heating element, thereby maximizing the use of the heat energy provided by the heating element.

[0022] Further, a valve is provided on the control pipeline, and the valve is used to control the flow rate of the fluid in the pipeline. Preferably, the valve is installed between the first exhaust pipe and the tee. In some embodiments, the valve can also be installed on the control loop or the second exhaust pipe to control the ejection speed of the fluid.

[0023] Further, a disinfection unit is provided on the control pipeline. The disinfection unit is used to disinfect the fluid in the control pipeline, and the disinfected fluid enters the second exhaust pipe and is ejected from the nozzle.

[0024] As another preferred embodiment of the present invention, the nozzle includes an air inlet, a first exhaust port, a second exhaust port, and a spray hole. One end of the air inlet is connected to the intake pipe, and the other end of the air inlet is connected to the first exhaust port. The first exhaust port is connected to the first exhaust pipe; one end of the second exhaust port is connected to the second exhaust pipe, and the other end of the second exhaust port is connected to the spray hole. The spray hole is connected to the nozzle; the switch is used to turn on and off the connection between the air inlet and the first exhaust port. Preferably, the air inlet is connected to the intake pipe by a thread, the first exhaust port is connected to the first exhaust pipe by a thread, and the second exhaust port is connected to the second exhaust pipe by a thread. Preferably, the connection mode between the spray hole and the nozzle can be a detachable connection mode such as a thread connection, a snap connection, an inlay connection, or a fastener connection. Through the above settings, the fluid enters the air inlet through the intake pipe, and then flows through the first exhaust port, the first exhaust pipe, the control loop, the second exhaust pipe, the second exhaust port, and the spray port in sequence, and finally is ejected from the nozzle. The switch is used to block or connect the air inlet and the first exhaust port to realize the on-off of the intake pipe and the exhaust pipe, so that the heating element can only heat the exhaust pipe, and further, the heating element only heats the second exhaust pipe.

[0025] Further, a switch port is provided on the nozzle, and the switch port extends into the nozzle to form a switch cavity. The switch cavity is connected to the air inlet and the first exhaust port; the switch is a hollow structure, and the switch is provided with a first hole and a second hole. The switch includes a connected state and a blocked state. In the connected state, the first hole is connected to the air inlet, and the second hole is connected to the first exhaust port. In the blocked state, the switch blocks the connection between the air inlet and the first exhaust port. When the switch is in the connected state, the fluid in the air inlet enters the switch through the first hole, and then enters the first exhaust port through the second hole, realizing the conduction of the intake pipe and the first exhaust pipe; when the switch is in the blocked state, the first hole and the second hole are closed by the inner wall of the switch cavity, and the fluid in the intake pipe contacts the outer wall of the switch, and the fluid in the intake pipe cannot enter the first exhaust pipe through the switch cavity.

[0026] Furthermore, a spring is provided in the switch cavity, one end of the spring is connected to the outer wall of the switch, and the other end is connected to the inner wall of the switch cavity, and the spring is used to reset the switch from the connected state to the blocked state. In the initial state, the spring is of natural length, and the switch is in the blocked state. When the fluid needs to be sprayed, the switch is pressed in the direction of the switch cavity to overcome the force of the spring, the first hole and the second hole are aligned with the air inlet and the first exhaust port respectively, the air inlet pipe and the first exhaust pipe are connected, and the gas is sprayed from the nozzle after heating. After the dental treatment is completed, the force applied to the switch is removed, and the switch is reset from the connected state to the blocked state under the action of the spring. The above-mentioned setting structure is convenient for medical personnel to operate. After pressing the switch, the fluid passage is connected and the heating element is turned on. The heating element heats the fluid in the second exhaust pipe. After the operation is completed, the switch is released, and the switch is reset under the force of the spring, blocking the fluid passage and turning off the heating element at the same time.

[0027] Furthermore, a thermosensitive layer is provided on the nozzle. The thermosensitive layer is made of a thermosensitive material, which can change color as the nozzle wall temperature changes, indicating to medical staff whether the current nozzle temperature is suitable for the patient's wound surface, further simplifying the operation and reducing misoperation.

[0028] Based on any of the above-mentioned dental spray guns, the present invention provides a method for using the dental spray gun, the method comprising the following steps:

[0029] The air source or water source is turned on, and the fluid enters the air inlet pipe;

[0030] After the gas source or water source is turned on, the gas, liquid, and gas-liquid mixture enters the air intake pipe and is blocked in the air intake pipe. Regardless of whether the heating element is turned on or not, the fluid in the air intake pipe is not heated.

[0031] The switch is turned on, and the fluid flows from the intake pipe to the exhaust pipe;

[0032] After the switch is turned on, the intake pipe and the exhaust pipe are connected, and the fluid enters the exhaust pipe. The fluid in the exhaust pipe is used to control the control switch of the heating element to turn on, and on the other hand, it flows through the heating element and is heated by the heating element.

[0033] The heating element is turned on, the heating element heats the fluid in the exhaust pipe, and the heated fluid is ejected from the nozzle;

[0034] The heating element may be turned on before or after the switch, or may be turned on simultaneously with the switch.

[0035] Further, the switch controls the conduction of the intake pipe and the exhaust pipe, and simultaneously controls the heating element to start heating; the switch controls the blockage of the intake pipe and the exhaust pipe, and simultaneously controls the heating element to stop heating. After the switch controls the fluid passage to conduct, the fluid enters the control loop and triggers the control switch, turning on the heating element. The heating element starts to heat up. After the heating element has heated up for several seconds, the fluid in the second exhaust pipe passes through the heating element and conducts heat transfer. The heated heating element is finally ejected from the nozzle. After the switch controls the fluid passage to block, the fluid is blocked in the intake pipe, and the fluid in the exhaust pipe is continuously discharged under the action of the internal pressure. After the fluid that triggers the control switch leaves, the heating element stops heating. The remaining fluid in the second exhaust pipe passes through the heating element and takes away part of the heat, maximizing the use of the heat energy of the heating element.

[0036] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0037] 1. The present invention changes the traditional heating structure and method. An exhaust pipe is provided between the intake pipe and the nozzle, and the heating element is arranged on the exhaust pipe. By using the switch to turn on and off the fluid flow between the intake pipe and the exhaust pipe, the exhaust pipe is always connected to the external atmosphere through the nozzle. The exhaust pipe is an open space. Whenever the heating element arranged inside or outside the exhaust pipe is turned on, it always heats the fluid in the open space, fundamentally avoiding the volume expansion of the fluid in the closed space. The fluid sprays out from the nozzle during the heating and constant temperature processes. The temperature and flow rate of the sprayed fluid do not increase or decrease suddenly. The continuous, uniform, and constant-temperature fluid acting on the wound surface can significantly improve the comfort of the patient.

[0038] 2. In the present invention, even if the heating element and the temperature control component are abnormal, when the switch is closed, the heating element only heats the gas in the pipe, and the heated gas is connected to the external atmosphere; when the switch is opened, the fluid continuously takes away part of the heat, not only slowing down the too-fast heating rate of the heating element, but also the heating rate of the flowing fluid is slower than that of the fluid in the sealed space. When it is observed through the thermosensitive layer on the nozzle that the color of the thermosensitive layer changes significantly, the operation can be stopped immediately for inspection, improving the reliability of the device and greatly reducing the safety risk.

[0039] 3. The exhaust pipeline of the present invention is divided into two sections, and a control pipeline is arranged between the two sections. After the switch is turned on, the fluid pipeline is connected, and the fluid entering the control pipeline triggers the heating element control switch, thereby controlling the heating element to turn on and heat the second exhaust pipe. After that, the fluid enters the second exhaust pipe and is heated by the heating element during the flow process, and finally the heated fluid is ejected from the nozzle; after the switch is turned off, the fluid is blocked in the intake pipe, and the remaining fluid in the first exhaust pipe is discharged under the action of the internal pressure, and the heating element control switch is turned off after no fluid touches it, and the heating element stops heating; through the above arrangement, medical personnel can control the heating of the heating element and the connection and disconnection of the fluid pipeline only through the switch on the nozzle, which not only simplifies the operation of medical personnel and avoids the situation that the heating element is turned on but the fluid pipeline is not connected or the heating element is not turned on but the fluid pipeline is connected due to misoperation, but also heating is performed only after the fluid pipeline is connected, thereby reducing energy consumption;

[0040] 4. In the control pipeline of the present invention, the length of the second exhaust pipe is longer than the distance between the three-way and the control switch through the three-way and the control switch, so that after the heating element is turned on, the fluid passes through the heating element after the heating element is heated to a certain temperature, and then the fluid at the nozzle outlet has an initial temperature that can be suitable for the wound surface, reducing the waste of the fluid and shortening the fluid heating time; and after the switch is turned off, the fluid between the three-way and the control switch is emptied first, the heating element stops heating, and the fluid in the second exhaust pipe can gradually take away the temperature in the heating element, maximizing the use of the heat energy provided by the heating element;

[0041] 5. The switch structure design of the present invention is convenient for medical personnel to operate. After pressing the switch, the fluid passage is connected and the heating element is turned on. The heating element heats the fluid in the second exhaust pipe. After the operation is completed, the switch is released, and the switch is reset under the action of the spring, blocking the fluid passage and turning off the heating element at the same time.

[0042] 6. The present invention provides a thermosensitive layer on the nozzle to indicate to medical personnel whether the current temperature of the nozzle is suitable for the wound surface of the patient, thereby further simplifying the operation and reducing misoperation. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0044] Figure 1 It is a structural schematic diagram of a specific embodiment of the present invention;

[0045] Figure 2 This is a schematic diagram of the structure of a specific embodiment of the present invention without the handle;

[0046] Figure 3 It is an axonometric view of a nozzle according to a specific embodiment of the present invention;

[0047] Figure 4 It is the bottom view of the nozzle of the specific embodiment of the present invention;

[0048] Figure 5 is Figure 4 the cross-sectional view of the A-A plane in

[0049] Figure 6 is Figure 4 the cross-sectional view of the B-B plane in

[0050] Figure 7 It is the schematic diagram of the control system in the specific embodiment of the present invention.

[0051] Marks in the attached drawings and corresponding component names:

[0052] 1 - nozzle, 2 - nozzle orifice, 3 - handle, 4 - switch, 5 - intake pipe, 6 - first exhaust pipe, 7 - second exhaust pipe, 8 - thermal layer, 9 - heating element, 11 - air inlet, 12 - first exhaust port, 13 - second exhaust port, 14 - spring, 15 - spray hole, 20 - valve, 21 - tee, 22 - control switch, 23 - disinfection unit. Specific Embodiments

[0053] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with embodiments and the attached drawings. The illustrative embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0054] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inner", "outer", etc. are based on the orientation or positional relationships shown in the attached drawings. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the protection scope of the present invention.

[0055] Embodiment 1:

[0056] As Figure 1 and Figure 2A dental spray gun as shown includes a nozzle head 1 and an air inlet pipe 5. A nozzle 2, a handle 3 and a switch 4 are arranged on the nozzle head 1. The air inlet pipe 5 is connected with an exhaust pipe line, and the exhaust pipe line is communicated with the nozzle 2. A heating element 9 is arranged on the exhaust pipe line. The switch 4 is used to connect or disconnect the connection between the air inlet pipe 5 and the exhaust pipe line. The exhaust pipe line includes a first exhaust pipe 6 and a second exhaust pipe 7. Among them, the first exhaust pipe 6 is communicated with the air inlet pipe 5, and the second exhaust pipe 7 is communicated with the nozzle 2. A control pipe line is arranged between the first exhaust pipe 6 and the second exhaust pipe 7. The control pipe line is used to control the heating element 9 to be turned on or off. The heating element 9 is used to heat the fluid in the second exhaust pipe 7. A thermal sensitive layer 8 is arranged on the nozzle 2.

[0057] In some embodiments, the heating element 9 is a resistance wire.

[0058] In some embodiments, the heating element 9 can be arranged either outside the second exhaust pipe 7 or inside the second exhaust pipe 7.

[0059] In some embodiments, the fluid can be gas, liquid and gas-liquid mixture. Preferably, the fluid is gas.

[0060] In some embodiments, the heating element 9 can be controlled separately from the switch 4.

[0061] The above-mentioned heating element control switch triggered by fluid is a pneumatic electric switch or a water flow switch. Both the pneumatic electric switch and the water flow switch are prior arts and are triggered by the flowing gas and liquid respectively.

[0062] Before use, the switch 4 is in a blocked state. When the gas source or water source is turned on, the fluid enters and is blocked in the air inlet pipe 5. The pressures on both sides of the switch 4 are different, and the second exhaust pipe 7 is communicated with the atmosphere. When in use, the switch 4 is switched to the connected state. As Figure 2 shown, the fluid enters from the air inlet pipe 5 into the first exhaust pipe 6. Then the fluid passes through the control circuit, triggers the heating element 9 to start heating the second exhaust pipe 7. Subsequently, the fluid enters the second exhaust pipe 7 through the control circuit and is heated. The heated fluid enters the nozzle 2 from the second exhaust pipe 7. The fluid with increased temperature transfers part of the heat to the thermal sensitive layer 8 through the nozzle 2, causing the thermal sensitive layer 8 to change color. Medical staff can judge whether they can start to process the wound surface according to the color change degree of the thermal sensitive layer.

[0063] In this embodiment, by changing the traditional heating structure and method, the exhaust pipe is always connected to the external atmosphere through the nozzle, and the exhaust pipe is an open space. Whenever the heating element disposed inside or outside the exhaust pipe is turned on, it always heats the fluid in the open space, fundamentally avoiding the volume expansion of the fluid in the closed space. During the heating and constant temperature process of the fluid, the fluid sprays out from the nozzle, and the temperature and flow rate of the sprayed fluid do not increase or decrease suddenly. The continuous, uniform, and constant temperature fluid acting on the wound surface can significantly improve the comfort of the patient. Even if the heating element and the temperature control component are abnormal, when the switch is turned off, the heating element only heats the gas in the pipe, and the heated gas is connected to the external atmosphere; when the switch is turned on, the fluid continuously takes away part of the heat, not only slowing down the too fast heating rate of the heating element, but also the heating rate of the flowing fluid is slower than that of the fluid in the sealed space. When it is observed through the thermal sensitive layer on the nozzle that the color of the thermal sensitive layer changes significantly, the operation can be stopped immediately for inspection, improving the reliability of the device and significantly reducing the safety risk. Moreover, medical staff can control the heating of the heating element and the on / off of the fluid pipeline only through the switch on the nozzle, which not only simplifies the operation of medical staff, avoids the situation where the heating element is turned on while the fluid pipeline is not conducted or the heating element is not turned on while the fluid pipeline is conducted due to misoperation, but also starts heating only after the fluid pipeline is conducted, reducing energy consumption.

[0064] Embodiment 2:

[0065] As Figure 7 shown, on the basis of Embodiment 1, the control pipeline includes a three-way joint 21 and a control switch 22. The inlet end of the three-way joint 21 is connected to the first exhaust pipe 6, one outlet end of the three-way joint 21 is connected to the second exhaust pipe 7, and the other outlet end of the three-way joint 21 is connected to the control switch 22. The control switch 22 is electrically connected to the heating element 9; the control switch 22 is a pneumatic electric switch or a water flow switch.

[0066] In some embodiments, a valve 20 is provided in the control pipeline, and the valve 20 is used to control the flow rate of the fluid in the pipeline.

[0067] In some embodiments, a disinfection unit 23 is provided on the control pipeline.

[0068] The control switch and the heating element are electrically connected through a wire. In some embodiments, the wire can be disposed either inside the pipeline or outside the pipeline.

[0069] During use, after the fluid in the first exhaust pipe 6 enters the control pipeline, a small part of the fluid flows to the control switch 22 and triggers the control switch 22 to turn on, and the heating element 9 starts to heat the second exhaust pipe 7. The remaining fluid enters the second exhaust pipe 7 and sprays out from the nozzle 2 after being heated.

[0070] In some embodiments, the length of the second exhaust pipe is 10 to 20 times the length of the distance between the tee joint and the control switch, so that after the heating element is turned on, when the heating element is heated to a certain temperature, the fluid passes through the heating element, and then the fluid at the nozzle outlet has an initial temperature suitable for the wound surface, reducing the waste of the fluid and shortening the fluid heating time; and, after the switch is turned off, the fluid between the tee joint and the control switch is emptied first, the heating element stops heating, and the fluid in the second exhaust pipe can gradually take away the temperature in the heating element, maximizing the use of the heat energy provided by the heating element.

[0071] Embodiment 3:

[0072] As Figures 3 to 6 shown, on the basis of the above embodiments, the nozzle 1 includes an air inlet 11, a first exhaust port 12, a second exhaust port 13, and a spray hole 15. One end of the air inlet 11 is connected to the air inlet pipe 5, and the other end of the air inlet 11 is connected to the first exhaust port 12. The first exhaust port 12 is connected to the first exhaust pipe 6; one end of the second exhaust port 13 is connected to the second exhaust pipe 7, and the other end of the second exhaust port 13 is connected to the spray hole 15. The spray hole 15 is connected to the nozzle 2; the switch 4 is used to connect and disconnect the connection between the air inlet 11 and the first exhaust port 12; a switch port is provided on the nozzle 1, and the switch port extends into the nozzle 1 to form a switch cavity, and the switch cavity is connected to the air inlet 11 and the first exhaust port 12; the switch 4 is a hollow structure, and a first hole and a second hole are provided on the switch 4. The switch 4 includes a connected state and a blocked state. In the connected state, the first hole is connected to the air inlet 11, and the second hole is connected to the first exhaust port 12. In the blocked state, the switch 4 blocks the connection between the air inlet 11 and the first exhaust port 12; a spring 14 is provided in the switch cavity, one end of the spring 14 is connected to the outer wall of the switch 4, and the other end is connected to the inner wall of the switch cavity. The spring 14 is used to reset the switch 4 from the connected state to the blocked state.

[0073] The above structure is convenient for medical staff to operate. After pressing the switch, the fluid passage is turned on and the heating element is turned on. The heating element heats the fluid in the second exhaust pipe. After the operation is completed, the switch is released, and the switch is reset under the action of the spring, blocking the fluid passage and closing the heating element at the same time.

[0074] Embodiment 4:

[0075] On the basis of the above embodiments, there is also provided a method for using a dental spray gun. The method uses any one of the dental spray guns in the above embodiments. The method includes the following steps:

[0076] The air source or water source is turned on, and the fluid enters the air inlet pipe;

[0077] The switch is turned on, and the fluid flows from the air inlet pipe to the exhaust pipe;

[0078] The heating element is turned on, and the heating element heats the fluid in the exhaust pipe. The heated fluid is ejected from the nozzle.

[0079] Furthermore, the switch controls the conduction between the intake pipe and the exhaust pipe, and simultaneously controls the heating element to start heating; the switch controls the blockage between the intake pipe and the exhaust pipe, and simultaneously controls the heating element to stop heating.

[0080] The "first", "second", etc. (such as the first exhaust pipe, the second exhaust pipe, the first exhaust port, the second exhaust port, etc.) used in this article are only used to distinguish the corresponding components for the sake of clear description, and are not intended to limit any order or emphasize importance, etc. In addition, the term "connected" used in this article can be directly connected without special explanation, or can be indirectly connected via other components.

[0081] The specific embodiments described above further elaborate on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A dental spray gun, comprising a spray head and an air inlet pipe, wherein a nozzle, a handle and a switch are arranged on the spray head, and it is characterized in that A thermal-sensitive layer is provided on the nozzle. The intake pipe is connected to an exhaust pipe line, which includes a first exhaust pipe and a second exhaust pipe. The first exhaust pipe is communicated with the intake pipe through a switch. The second exhaust pipe is communicated with the nozzle, and a heating element is provided on the second exhaust pipe to heat the fluid in the second exhaust pipe; A control pipe line is provided between the first exhaust pipe and the second exhaust pipe. The control pipe line includes a tee joint and a control switch. The inlet end of the tee joint is communicated with the first exhaust pipe. One outlet end of the tee joint is communicated with the second exhaust pipe, and the other outlet end is communicated with the control switch. The length of the second exhaust pipe is longer than the pipe distance between the tee joint and the control switch. The control switch is electrically connected to the heating element to control the heating element to be turned on or off; The spray head includes an air inlet, a first exhaust port, a second exhaust port, and a spray hole. One end of the air inlet is communicated with the intake pipe, and the other end of the air inlet is communicated with the first exhaust port. The first exhaust port is communicated with the first exhaust pipe; One end of the second exhaust port is communicated with the second exhaust pipe, and the other end of the second exhaust port is communicated with the spray hole. The spray hole is communicated with the nozzle; The switch is used to connect or disconnect the connection between the air inlet and the first exhaust port; A switch port is provided on the spray head. The switch port extends into the spray head to form a switch cavity, which is communicated with the air inlet and the first exhaust port; The switch is of a hollow structure, and a first hole and a second hole are provided on the switch. The switch includes a connected state and a blocked state. In the connected state, the first hole is communicated with the air inlet, and the second hole is communicated with the first exhaust port. In the blocked state, the switch blocks the connection between the air inlet and the first exhaust port.

2. The dental spray gun according to claim 1, characterized in that, A valve is provided on the control pipe line, and the valve is used to control the flow rate of the fluid in the pipe line.

3. A dental spray gun according to claim 1, characterized in that, A spring is provided in the switch cavity. One end of the spring is connected to the outer wall of the switch, and the other end is connected to the inner wall of the switch cavity. The spring is used to reset the switch from the connected state to the blocked state.

4. A method for using a dental spray gun, characterized in that, Using the dental spray gun according to any one of claims 1 to 3, the method includes the following steps: The air source or water source is turned on, and the fluid enters the intake pipe; The switch is turned on, and the fluid flows from the intake pipe to the exhaust pipe line; The heating element is turned on, and the heating element heats the fluid in the exhaust pipe line, and the heated fluid is ejected from the nozzle.

5. The usage method of a dental spray gun according to claim 4, characterized in that, The switch controls the conduction between the intake pipe and the exhaust pipe line, and at the same time controls the heating element to start heating; The switch controls the blockage between the intake pipe and the exhaust pipe line, and at the same time controls the heating element to stop heating.

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