Dental handpiece with gas circuit anti-back-suction device

Abstract

The utility model provides a dental handpiece with a gas circuit anti-back-suction device, and belongs to the technical field of dental handpieces. Comprising a dental handpiece handle, a connecting threaded sleeve is connected to the rear end of the dental handpiece handle, a connecting base is arranged in the connecting threaded sleeve, an air inlet channel and an exhaust and back suction prevention channel are formed in the connecting base, and a back suction prevention assembly used for opening and closing the channel is arranged in the exhaust and back suction prevention channel; during normal work, the anti-back-suction assembly is opened under the action of air return in the handle of the dental handpiece, so that the exhaust and anti-back-suction channel exhausts air; and when working is stopped, the anti-back-suction assembly closes the exhaust and anti-back-suction channel so as to prevent back suction of the head of the dental handpiece. The utility model not only solves the problem that when negative pressure is generated in the inner cavity of the head of the dental handpiece, external bloodstains and dirt are sucked back into the head of the handpiece from a gap of the head, so that cross infection among patients is easily caused in the treatment process, but also enables the anti-back-suction structure to be simpler and more convenient to manufacture.

Description

Technical Field

[0001] The utility model belongs to the technical field of dental mobile phones, and in particular relates to a dental mobile phone with an air path anti-back-suction device. Background Art

[0002] The dental handpieces currently in use do not have an anti-backsuction function. When the air intake at the tail of the handpiece stops, the high-speed rotating rotor in the head cannot stop instantly. Under the inertia of high-speed rotation, negative pressure will be generated in the inner cavity of the head, causing external blood stains and dirt to be sucked back into the handpiece head through the gaps at the front and rear ends of the head, which can easily lead to cross-infection between patients during treatment.

[0003] In order to solve the above problems, patent CN109602505A discloses an anti-back-suction device for a dental handpiece, which solves the problem of medical cross infection caused by contaminants at the front end of the handpiece being sucked into the handpiece. However, the technical solution of the patent includes: the air inlet channel is composed of an upper air inlet channel, a lower air inlet channel, and a transverse air inlet channel; the air return channel is composed of an upper air return channel, a lower air return channel, and a transverse air return channel; between the upper air inlet channel and the lower air inlet channel, a connecting hole is provided that transversely penetrates the upper air inlet channel and the lower air inlet channel, and the connecting hole is a transverse air inlet channel; between the upper air return channel and the lower air return channel, a connecting hole is provided that transversely penetrates the upper air return channel and the lower air return channel, and the connecting hole is a transverse air return channel. When the air intake is opened, the air pressure in the air intake hole increases, the air flow enters the lower air intake channel, the air pressure pushes the valve core to move, the air intake transverse channel opens, the upper air intake channel is connected with the lower air intake channel, the air flow enters the air intake pipe, enters the handpiece to make the movement operate, and at the same time, the side hole of the valve core moves to the transverse channel between the upper and lower return air channels, then the lower return air channel is connected with the inner hole of the valve core, and the air flow in the inner cavity of the handle can enter the lower return air channel after passing through the inner hole of the valve core for exhaust, and the dental handpiece can work normally. When the air intake is closed, the air flow pressure in the lower air intake channel decreases, the valve core returns to its original position under the action of the spring, and the side of the valve core closes the return air transverse channel between the upper and lower return air channels, and the air flow in the inner cavity of the handle cannot be discharged from the inner hole of the valve core to the lower return air channel, that is, the valve is closed, but at this time the movement is still running at high speed. Since the return air channel cannot exhaust, a certain positive pressure will be formed in the inner cavity of the handle and the inner cavity of the handpiece, and the air flow will gradually be discharged from the front and rear ends of the handpiece until the wind wheel stops rotating, so as to prevent the pollutants at the front end of the handpiece from being sucked into the interior of the handpiece and causing medical cross infection. It can be seen from the above structural features that the air intake path and the anti-back-inhalation path of the dental handpiece in the patent need to be completed through the action of the valve core and the spring, which leads to a complex structure and inconvenient manufacturing. Therefore, it is necessary to propose improvements. Utility Model Content

[0004] The technical problem solved by the utility model is: to provide a dental handpiece with an air circuit anti-backsuction device. The utility model aims to solve the problem that when negative pressure is generated in the inner cavity of the dental handpiece head, external blood stains and dirt will be sucked back into the handpiece head through the head gap, which may easily lead to cross infection between patients during treatment, and to ensure that the anti-backsuction structure is simpler and more convenient to manufacture.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A dental handpiece with an air path anti-back-suction device comprises a dental handpiece handle, a connecting threaded sleeve being connected to the rear end of the dental handpiece handle, a connecting seat being arranged inside the connecting threaded sleeve, an air intake channel and an exhaust and anti-back-suction channel being arranged on the connecting seat, an anti-back-suction component for opening and closing the channel being arranged in the exhaust and anti-back-suction channel; when working normally, the anti-back-suction component is opened under the action of the return air inside the dental handpiece handle to exhaust the exhaust and anti-back-suction channel; when working stops, the anti-back-suction component closes the exhaust and anti-back-suction channel to prevent the dental handpiece head from sucking back.

[0007] To further limit the above scheme, the exhaust and anti-back-inhalation channel is a stepped hole composed of a large diameter hole and a small diameter hole, the large diameter hole is close to the outer end of the connecting seat, the small diameter hole is close to the inner end of the connecting seat, and an annular step surface is formed at the connection between the large diameter hole and the small diameter hole.

[0008] To further define the above scheme, the anti-back-suction assembly includes a tracheal sleeve, a spring and a valve core, the tracheal sleeve is fixedly sleeved in the large-diameter hole of the exhaust and anti-back-suction channel, the spring and the valve core are installed inside the tracheal sleeve, the valve core is in contact with the annular step surface between the large-diameter hole and the small-diameter hole, and the spring presses the valve core by elastic force.

[0009] To further define the above scheme, the tracheal sleeve includes a tracheal outer sleeve and an inner tracheal sleeve, the outer surface of the tracheal sleeve is fixedly connected to the inner surface of the large-diameter hole, the inner tracheal sleeve is coaxially arranged inside the tracheal sleeve and forms a stopper inside the tracheal sleeve, one end of the spring is limited by the stopper, and the other end of the spring is pressed on the valve core.

[0010] As a further limitation of the above solution, the outer surface of the tracheal sleeve and the inner surface of the large diameter hole are fixed by adhesive bonding.

[0011] As a further limitation of the above solution, the tracheal outer sleeve and the tracheal inner sleeve are an integrally formed structure.

[0012] As a further limitation of the above scheme, the tracheal outer sleeve and the tracheal inner sleeve are split-type processed structures, and the outer surface of the tracheal inner sleeve and the inner surface of the tracheal outer sleeve are fixed by adhesive bonding.

[0013] As a further limitation of the above solution, the valve core is a steel ball.

[0014] As a further limitation of the above solution, the wire diameter of the spring is between 0.05-0.5 mm.

[0015] As a further limitation of the above solution, the edge of the annular step surface that contacts the valve core is chamfered or rounded.

[0016] The advantages of this utility model compared with the prior art:

[0017] In this solution, during normal operation, the driving gas directly enters the dental handpiece handle from the air inlet channel to make it operate. During operation, the return air in the dental handpiece handle will first enter the exhaust and anti-back-inhalation channels, and the valve core will be pushed open by the pressure of the return air, and the handpiece will be discharged from the exhaust and anti-back-inhalation channels. At this time, the entire circuit has both air intake and exhaust, and the entire pipeline is normal. When the work stops, the return air pressure in the dental handpiece handle decreases, and the spring will push the valve core to fit with the step hole under the action of elastic force, which plays a role in closing the return air, thereby closing the back-inhalation pipeline, effectively preventing the negative pressure in the inner cavity of the dental handpiece head from causing external blood stains and dirt to be sucked back into the handpiece head from the gaps at the front and rear ends of the head, playing an anti-back-inhalation effect, and avoiding the risk of cross-infection between patients during treatment; this structure not only plays an anti-back-inhalation role, but also has a simple structure and is more convenient to manufacture and process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the utility model;

[0019] Figure 2 It is a cross-sectional structural diagram of the connecting seat and the anti-back sucking component installed therein in the utility model;

[0020] Figure 3 It is a cross-sectional structural diagram of the connecting seat in the utility model;

[0021] Figure 4 It is a top view of the connecting seat in the utility model. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0024] See also Figure 1-4 , describe the embodiments of the present utility model in detail.

[0025] Embodiment: A dental handpiece with an airway anti-suckback device, see Figure 1 and 2 As shown, it includes a dental handpiece handle 1, the rear end of which is connected to a connecting threaded sleeve 2, a connecting seat 3 is provided inside the connecting threaded sleeve 2, an air intake channel 3-1 and an exhaust and anti-back-sucking channel 3-2 with axes parallel to each other are provided on the connecting seat 3, and an anti-back-sucking component 4 for opening and closing the channel is provided in the exhaust and anti-back-sucking channel 3-2. When working normally, the anti-back-sucking component 4 is opened under the action of the return air inside the dental handpiece handle 1 to exhaust the exhaust and anti-back-sucking channel 3-2; when working stops, the anti-back-sucking component 4 closes the exhaust and anti-back-sucking channel 3-2 to prevent the dental handpiece head from sucking back.

[0026] In a specific implementation: see Figure 3 and 4 As shown, the exhaust and anti-back-inhalation channel 3-2 is a step hole formed by coaxially connecting a large diameter hole 3-2-1 and a small diameter hole 3-2-2, wherein the large diameter hole 3-2-1 is close to the outer end of the connecting seat 3, and the small diameter hole 3-2-2 is close to the inner end of the connecting seat 3, and an annular step surface 3-2-4 is formed at the connection between the large diameter hole 3-2-1 and the small diameter hole 3-2-2.

[0027] Specifically, the anti-back-suction assembly 4 includes an tracheal sleeve 5, a spring 6 and a valve core 7. The tracheal sleeve 5 is fixedly sleeved in the large-diameter hole 3-2-1 of the exhaust and anti-back-suction channel 3-2. The spring 6 and the valve core 7 are installed inside the tracheal sleeve 5. The valve core 7 is in contact with the annular step surface 3-2-4 between the large-diameter hole 3-2-1 and the small-diameter hole 3-2-2. The spring 6 presses the valve core 7 by elastic force.

[0028] In the above structure, the step surface is mainly used to facilitate the installation of the anti-back-sucking assembly. The valve core is compressed by a spring to achieve elastic compression, which facilitates the closing and opening of the valve core when the pressure on both sides is unbalanced.

[0029] In a specific implementation: see Figure 2 As shown, the tracheal sleeve 5 includes a tracheal outer sleeve 5-1 and an endotracheal sleeve 5-2, both of which are hollow cylindrical tubular structures; the outer surface of the tracheal outer sleeve 5-1 is fixedly connected to the inner surface of the large-diameter hole 3-2-1, and the endotracheal sleeve 5-2 is coaxially arranged inside the tracheal outer sleeve 5-1 and forms a stopper inside the tracheal outer sleeve 5-1, one end of the spring 6 is limited by the stopper, and the other end of the spring 6 is pressed on the valve core 7.

[0030] In the above structure, the stopper inside the tracheal sleeve is mainly used to limit the position of the spring, and the through hole inside the tracheal sleeve is connected to facilitate the circulation of gas.

[0031] In a specific implementation manner: the outer surface of the tracheal sleeve 5-1 and the inner surface of the large diameter hole 3-2-1 are fixed by gluing.

[0032] In a specific embodiment: the tracheal sleeve 5-1 and the tracheal sleeve 5-2 are an integrally formed structure;

[0033] Alternatively, the tracheal sleeve 5-1 and the tracheal inner sleeve 5-2 are separately processed structures, and the outer surface of the tracheal inner sleeve 5-2 is fixed to the inner surface of the tracheal sleeve 5-1 by adhesive bonding.

[0034] The above structures can conveniently realize the production of the inner baffle of the tracheal sleeve, wherein the split structure makes the processing more convenient and simple, and reduces the processing difficulty.

[0035] Preferably, the valve core 7 is a steel ball, the size of which is determined by the diameter of the contact point between the annular step surface and the steel ball. The steel ball cooperates with the edge of the step surface to seal. The structure is not limited to steel balls, and a cylindrical or conical valve core can also be used to replace the steel ball.

[0036] Preferably, the wire diameter of the spring 6 is between 0.05-0.5 mm, which is obtained based on an experiment on the size of the air pressure during use of a dental mobile phone, to ensure that the pressure applied to the valve core is adapted to the changes in air pressure on both sides, thereby enabling the valve core to be opened and closed.

[0037] In a specific embodiment: the edge of the annular step surface 3-2-4 that contacts the valve core 7 is chamfered or rounded 3-2-3 to improve the sealing effect when contacting the valve core.

[0038] The anti-backsucking principle of this utility model:

[0039] During normal operation, the driving gas directly enters the dental handpiece handle 1 from the air inlet channel 3-1 to make it operate. During operation, the return air in the dental handpiece handle 1 will first enter the exhaust and anti-back-inhalation channels, and the valve core will be pushed open by the pressure of the return air, and the handpiece will be discharged from the exhaust and anti-back-inhalation channels. At this time, the entire circuit has both air intake and exhaust, and the entire pipeline is normal. When the operation stops, the return air pressure in the dental handpiece handle 1 decreases, and the spring 6 will push the valve core 7 to fit with the step hole under the action of elastic force to close the return air, thereby closing the back-inhalation pipeline, effectively preventing the negative pressure in the inner cavity of the dental handpiece head from causing external blood stains and dirt to be sucked back into the handpiece head from the gaps at the front and rear ends of the head, achieving an anti-back-inhalation effect and avoiding the risk of cross-infection between patients during treatment.

[0040] The structure not only has the function of preventing backflow, but also has the advantages of simple structure and more convenient manufacturing and processing.

[0041] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.

[0042] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A dental handpiece with an air path anti-suckback device, comprising a dental handpiece handle (1), wherein a connecting thread sleeve (2) is connected to the rear end of the dental handpiece handle (1), and a connecting seat (3) is provided inside the connecting thread sleeve (2), characterized in that: The connecting seat (3) is provided with an air intake channel (3-1) and an exhaust and anti-back-suction channel (3-2), and the exhaust and anti-back-suction channel (3-2) is provided with an anti-back-suction component (4) for opening and closing the channel; when working normally, the anti-back-suction component (4) is opened under the action of the return air inside the dental handpiece handle (1) to exhaust the exhaust and anti-back-suction channel (3-2); when working stopped, the anti-back-suction component (4) closes the exhaust and anti-back-suction channel (3-2) to prevent the dental handpiece head from sucking back.

2. A dental handpiece with an air circuit anti-suckback device according to claim 1, characterized in that: The exhaust and anti-back-inhalation channel (3-2) is a stepped hole formed by a large-diameter hole (3-2-1) and a small-diameter hole (3-2-2), wherein the large-diameter hole (3-2-1) is close to the outer end of the connecting seat (3), and the small-diameter hole (3-2-2) is close to the inner end of the connecting seat (3), and an annular stepped surface (3-2-4) is formed at the connection between the large-diameter hole (3-2-1) and the small-diameter hole (3-2-2).

3. A dental handpiece with an air circuit anti-suckback device according to claim 2, characterized in that: The anti-back-suction component (4) comprises an air pipe sleeve (5), a spring (6) and a valve core (7); the air pipe sleeve (5) is fixedly sleeved in the large-diameter hole (3-2-1) of the exhaust and anti-back-suction channel (3-2); the spring (6) and the valve core (7) are installed inside the air pipe sleeve (5); the valve core (7) contacts the annular step surface (3-2-4) between the large-diameter hole (3-2-1) and the small-diameter hole (3-2-2); and the spring (6) presses the valve core (7) by elastic force.

4. A dental handpiece with an air circuit anti-suckback device according to claim 3, characterized in that: The tracheal sleeve (5) comprises a tracheal outer sleeve (5-1) and an inner tracheal sleeve (5-2); the outer surface of the tracheal outer sleeve (5-1) is fixedly connected to the inner surface of the large-diameter hole (3-2-1); the inner tracheal sleeve (5-2) is coaxially arranged inside the tracheal outer sleeve (5-1) and forms a stopper inside the tracheal outer sleeve (5-1); one end of the spring (6) is limited by the stopper, and the other end of the spring (6) is pressed on the valve core (7).

5. A dental handpiece with an air circuit anti-suckback device according to claim 4, characterized in that: The outer surface of the tracheal jacket (5-1) and the inner surface of the large-diameter hole (3-2-1) are fixed by adhesive bonding.

6. A dental handpiece with an air circuit anti-sucking device according to claim 4, characterized in that: The tracheal outer sleeve (5-1) and the tracheal inner sleeve (5-2) are an integrally formed structure.

7. A dental handpiece with an air circuit anti-suckback device according to claim 4, characterized in that: The tracheal outer sleeve (5-1) and the tracheal inner sleeve (5-2) are split-type processing structures, and the outer surface of the tracheal inner sleeve (5-2) and the inner surface of the tracheal outer sleeve (5-1) are fixed by adhesive bonding.

8. The dental handpiece with an air circuit anti-suckback device according to claim 3, characterized in that: The valve core (7) is a steel ball.

9. The dental handpiece with an air circuit anti-suckback device according to claim 3, characterized in that: The wire diameter of the spring (6) is between 0.05-0.5 mm.

10. The dental handpiece with an air circuit anti-sucking device according to claim 3, characterized in that: The edge of the annular step surface (3-2-4) in contact with the valve core (7) is chamfered or rounded (3-2-3).

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