Dental extraoral suction arm

Abstract

To provide a dental extraoral suction arm that produces less suction noise.SOLUTION: A dental extraoral suction arm has multiple degrees of freedom and includes a plurality of arms having disposed on the tip of each a head 5 having an air suction opening 19 on the tip surface thereof. The head 5 comprises: a cylindrical inner cover 52; a mesh cup 6 constituted by a cylindrical cup base section 61 that can be inserted into the inner cover and a bottom section 62 having a mesh section 6b provided on one end of the cup base section 61; a cylindrical sound absorption member that is installed on the inside of the cup base section; and a hood 53 that has an intake air guide section 532 that serves as the suction opening, and is attached to the tip of the inner cover. The mesh cup is inserted into the inner cover in an orientation such that the mesh section is at the back in a state where the sound absorption member is installed on the cup base section. The end section of the intake air guide section is positioned so as to interfere, in the radial direction, with an end section opposite to the bottom section of the sound absorption member installed on the mesh cup.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to an extraoral suction arm for dental use.

Background Art

[0002] Patent Document 1 describes an extraoral dental vacuum device (hereinafter also referred to as a suction arm) having multiple degrees of freedom in which a plurality of arms are connected in series and are relatively rotatable. This suction arm includes, at the tip arm, a cylindrical sound-absorbing material detachably inserted from the tip side, and a suction hood for preventing the sound-absorbing material from coming out. The suction arm is installed near a treatment chair in a dental clinic and is connected to a suction machine. The suction arm sucks air outside the oral cavity from the tip of the tip arm by the operation of the suction machine. The sound-absorbing material reduces the sound generated by this air suction (hereinafter referred to as the intake sound). A dental extraoral suction system is constituted including the suction arm and the suction machine.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a suction arm provided with a sound-absorbing material as described in Patent Document 1, generally, a mesh member is disposed at a position on the opening side rather than the sound-absorbing material. The mesh member prevents foreign matter larger than the opening size of each hole of the mesh from entering the intake passage, and prevents the suction machine from sucking in large foreign matter and causing malfunctions in operation. The suction sound generated by the suction arm becomes larger as the suction force is stronger, and even if it has a sound-absorbing material, there is a risk that the operator will feel it as noise. Therefore, it is desired that the suction arm makes as little suction sound as possible.

[0005] Therefore, the problem that this invention aims to solve is to provide a dental extraoral suction arm that produces less suction noise. [Means for solving the problem]

[0006] To solve the above problems, the present invention has the following configuration and procedure. 1) It is configured to have multiple degrees of freedom, including a head portion having an air intake port on its tip surface, and a plurality of arm portions arranged at the tip of the head portion and connected in series, The head portion is, An inner cover formed in the shape of a cylindrical tube, A mesh cup comprising a cylindrical cup base that can be inserted into the inner cover, and a mesh portion, with a bottom provided at one end of the cup base, A cylindrical sound-absorbing member is inserted and mounted inside the base of the cup, The inner cover comprises a hood that has an intake guide portion which serves as the suction port and is detachably attached to the tip of the inner cover, The mesh cup is inserted into the inner cover with the mesh portion facing inwards, with the sound-absorbing member inserted and mounted on the base of the cup. The end of the intake guide portion of the hood is a dental extraoral suction arm located in a position that radially interferes with the end of the sound-absorbing member inserted into the mesh cup, opposite to the bottom portion. 2) The dental extraoral suction arm described in 1), wherein the intake guide portion is formed in a funnel shape with a longitudinal cross-sectional shape that is a curve that is convex inward, and the inner diameter of the end of the intake guide portion matches the inner diameter of the sound-absorbing member. 3) The dental extraoral suction arm according to 1), wherein when the axial orientation of the mesh cup and the head portion of the sound-absorbing member is set to the orientation of the first embodiment, the hood can be attached to the tip of the inner cover even when the mesh cup is set to the second embodiment which is the opposite orientation to the first embodiment. 4) A dental extraoral suction arm according to 1) or 2), wherein a space having a diameter larger than the inner diameter of the sound-absorbing member is provided between the sound-absorbing member and the bottom portion. [Effects of the Invention]

[0007] According to the present invention, the effect of low suction noise can be obtained. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a diagram showing a dental extraoral suction system ST including a suction arm 1, which is an embodiment of the dental extraoral suction arm according to the present invention. [Figure 2] Figure 2 is an external view showing the tip portion of the suction arm 1. [Figure 3] Figure 3 is a cross-sectional view of the half-body at position S3-S3 in Figure 2. [Figure 4] Figure 4 is a semi-cross-sectional view showing the head portion 5 of the suction arm 1. [Figure 5] Figure 5 is a semi-cross-sectional view showing the hood 53, which is the tip portion of the head portion 5 of the suction arm 1. [Figure 6] Figure 6 shows a mesh cup 6 attached to the hood 53, where Figure 6(a) is a half cross-sectional view of the mesh cup 6, Figure 6(b) is a partial plan view of the mesh portion 6b of the mesh cup 6, and Figure 6(c) is an enlarged view of portion A in Figure 6(a). [Figure 7] Figure 7 is a longitudinal cross-sectional view of the sound-absorbing member 7. [Figure 8] Figure 8 is an assembly diagram showing the procedure for attaching the sound-absorbing member 7 to the head unit 5 in the first embodiment. [Figure 9] Figure 9 is an assembly diagram showing the procedure for attaching the sound-absorbing member 7 to the head unit 5 in the second embodiment. [Figure 10] Figure 10 is a half-sectional view illustrating the head portion 5A assembled in the second embodiment. [Modes for carrying out the invention]

[0009] An extraoral dental suction arm according to an embodiment of the present invention will be explained using the suction arm 1 of the example.

[0010] (Example) FIG. 1 is a configuration diagram showing an extraoral dental suction system ST (hereinafter referred to as the suction system) including a suction arm 1 of an example. FIG. 2 is an external view showing the tip portion of the suction arm 1. First, the configuration of the suction system ST and the appearance of the suction arm 1 will be described with reference to FIGS. 1 and 2.

[0011] As shown in FIG. 1, the suction system ST includes a suction arm 1, a valve device 4, and a suction machine 3. The suction arm 1 and the valve device 4 are connected by a first ventilation pipe 41, and the valve device 4 and the suction machine 3 are connected by a second ventilation pipe 42. An exhaust pipe 43 for exhausting to an external space is further connected to the suction machine 3. The suction arm 1 and the valve device 4 are installed in the dental treatment room. The suction machine 3 is usually installed in a machine room separate from the dental treatment room, and the second ventilation pipe 42 is laid under the floor FL. A suction port 19 is opened on the tip surface of the head portion 5 disposed at the tip of the suction arm 1. Inside the suction arm 1, a ventilation path AK (see FIG. 3) having one end connected to the suction port 19 and the other end connected to the first ventilation pipe 41 is provided.

[0012] The valve device 4 has a motor 40 and an on-off valve (not shown), and in this example, it is installed on the floor FL of the treatment room. The valve device 4 may be installed under the floor. The on-off valve opens and closes the ventilation between the first ventilation pipe 41 and the second ventilation pipe 42 by the operation of the motor 40. The operation of the motor 40 is controlled by the control unit 32.

[0013] The suction machine 3 includes a pump 31 and a control unit 32. When the on / off valve is opened and the pump 31 operates, air is drawn in from the suction port 19 of the suction arm 1. After cutting dust, bacteria, viruses, etc. generated during treatment are removed by a filter (not shown), the air is discharged into the outside space through the exhaust pipe 43. The control unit 32 controls the operation of the entire suction system ST, including the pump 31. The control unit 32 does not necessarily have to be provided in the suction machine 3. The location of the control unit 32 is not limited. For example, it may be provided in the valve device 4.

[0014] The suction arm 1 is erected on the floor level (FL) of the examination room and has a so-called vertical multi-joint configuration in which multiple arm sections are connected in series, making it a multi-degree-of-freedom arm whose posture can be changed manually. The suction arm 1 has, from the floor FL side, a base 10, a first arm section 11, a second arm section 12, a third arm section 13, a fourth arm section 14, a fifth arm section 15, and a head section 5. The base 10 is the seat portion that is fixed to the floor FL. The first arm portion 11 is a tubular support column extending vertically upward from the base 10. The first arm portion 11 may also have a lifting function. In this example, the first arm portion 11 is a non-rotating pole member, but for convenience, the term "arm" is used. The upper end of the first arm portion 11 is provided with a first joint 21 that connects to the second arm portion 12. The second to fourth arm sections 12 to 14 are formed in a straight tubular shape and are connected in series at the first to third joints 21 to 23 so as to be able to rotate with a predetermined torque or greater around the first to third axes CL21 to CL23 that extend horizontally.

[0015] As shown in Figures 1 and 2, the fourth arm portion 14 is equipped with an annular switch ring 16. A portion of the switch ring 16 in the circumferential direction is raised radially outward, and the first switch, a suction switch 161, is attached to the tip side of this raised portion.

[0016] As shown in Figure 2, the fifth arm section 15 has a first elbow 15a, a second elbow 15b, and a third elbow 15c connected in series. The first elbow 15a is connected to the fourth arm section 14 via a first link shaft joint 151, and the first elbow 15a to the third elbow 15c are connected in series via a first offset joint 152 and a second offset joint 153. The head section 5 is connected to the third elbow 15c via the second link axial joint 154.

[0017] The first elbow 15a to the third elbow 15c are each formed with a bend such that one end face and the other end face are inclined at a 45° angle. The first link axis joint 151 and the second link axis joint are rotatable around the axis of the fourth arm 14 and the axis of the head portion 5, respectively, and the first offset joint 152 and the second offset joint 153 are rotatable around an axis perpendicular to the end face of the elbow they are provided for. These multi-joint structures allow the suction arm 1 to position the head portion 5 almost exactly as desired by the operator, and the tip of the head portion 5 can be directed in the desired direction.

[0018] The head portion 5 has a frustoconical cover 51 whose outer diameter expands towards the tip. The cover 51 is provided with a handle 17 and a release button 156. A hood 53 is detachably attached to the tip of the cover 51. When the hood 53 is inserted into the tip of the cover 51 from the tip side, it is locked in a predetermined insertion position by a well-known engagement structure. This lock is released by pressing the release button 156, so the hood 53 can be removed by pressing the release button 156.

[0019] The engagement structure includes, for example, a convex portion that protrudes inward on the release button 156 and a spring member that biases this convex portion inward. On the other hand, a recess is formed in the hood 53 into which the convex portion enters, and once the hood 53 is inserted to a predetermined position, the biasing force of the spring member causes the convex portion to enter and engage with the recess, locking it in place. The lock release mechanism is configured such that the release button 156 has a seesaw structure, and when the release button 156 is pressed with a force that resists the biasing force of the spring member, the convex part on the opposite side of the pivot point of the seesaw structure lifts up and disengages from the concave part.

[0020] Next, the structure of the head unit 5 will be explained with reference to Figures 3 to 8. For the sake of explanation, the tip side of the head unit 5 is considered the front, and the base side (the fifth arm 15 side) is considered the rear, with arrows indicating the front and rear directions in each figure.

[0021] Figure 3 is a cross-sectional view taken at position S2-S2 in Figure 2. In Figure 3, the head portion 5 is symmetrical with respect to the axis CL5, and half of it is shown. As shown in Figure 3, the head portion 5 is composed of a cover 51, an inner cover 52, a hood 53, a mesh cup 6, and a sound-absorbing member 7. Figure 4 is a cross-sectional view of one side of the cover 51 and the inner cover 52.

[0022] The cover 51 is formed in a cylindrical shape with an outer diameter that gradually increases towards the front. The inner cover 52 is formed in a cylindrical shape with an outer diameter smaller than that of the cover 51 and is arranged concentrically inside the cover 51. The inner cover 52 has a first stage 52a and a second stage 52b where the diameter increases, and is formed in a cylindrical shape with an inner diameter that increases in two stages towards the front. The cover 51 and inner cover 52 are made of resin. An example of resin is PP (polypropylene).

[0023] For convenience, the internal space of the inner cover 52 is designated as the first region AR1, the second region AR2, and the third region AR3, starting from the smallest inner diameter side and moving forward in Figure 4. The first region AR1 is connected to the ventilation passage AK. The ventilation passage AK passes through the inside of the fifth to first arm sections 15 to 11 and the base 10 and is connected to the first ventilation pipe 41.

[0024] The head unit 5 is equipped with a lighting device 18 at the front end between the cover 51 and the inner cover 52. The lighting device 18 has an annular substrate 181, and a plurality of light-emitting elements 182 are mounted on the front end surface of the substrate 181, spaced apart in the circumferential direction. The plurality of light-emitting elements 182 are turned on / off by the control unit 32. The substrate 181 is positioned between the inner circumferential rib 511 formed on the inner surface of the cover 51 and the outer circumferential rib 521 formed on the outer surface of the inner cover 52, and is secured by being sandwiched between an annular retaining ring 512, which is fixed from the front end by a fixing device (not shown). The lighting device 18 can be switched on or off using a lighting switch 171 provided at the tip of the handle 17.

[0025] The hood 53 shown in Figure 5 is made of a light-transmitting resin (for example, transparent PC) and has a cylindrical main body portion 531 and a flange portion 533 which is formed at the front end of the main body portion 531 and has an enlarged outer diameter. The flange portion 533 and the main body cylindrical portion 531 are connected by the intake guide portion 532. The intake guide section 532 has an inner surface 532c that is formed in a funnel shape with a longitudinal cross-sectional shape that is curved inward. As shown in Figure 3, the flange portion 533 is visible as the external appearance of the head portion 5, and the intake guide portion 532 is visible as the inner surface of the suction port 19 from the front of the head portion 5. The guide end 532a, which is the annular rear end of the intake guide section 532, is located in a position where it enters the space inside the main body cylindrical section 531. The inner diameter d1 of the guide end 532a is the same as the inner diameter d7 of the sound-absorbing member 7 shown in Figure 7. A female threaded portion 531a is formed at the rear end of the inner surface of the main cylindrical portion 531.

[0026] As shown in Figure 6(a), the mesh cup 6 has a cylindrical cup base 61 with an inner diameter d6 and a bottom 62 that closes one end of the cup base 61. The mesh cup 6 is made of resin, and an example of resin is PC. The mesh cup 6 has a male threaded portion 6a on the outer circumferential surface of the cup base 61, slightly forward of the center in the front-to-back direction. The bottom portion 62 has a mesh portion 6b formed in a range of approximately diameter D6 centered on the axis CL6. A stepped portion 6c is formed on the inner circumferential surface of the cup base 61 near the bottom portion 62, such that the inner diameter on the bottom portion 62 side is slightly smaller.

[0027] The cup base 61 can be inserted (inserted) into the inside of the main cylindrical portion 531 of the hood 53, and the male threaded portion 6a can be screwed into the female threaded portion 531a of the hood 53. The outer diameter D6 of the mesh portion 6b is larger than the inner diameter d1 of the guide end 532a of the hood 53 and the inner diameter d7 of the sound-absorbing member 7.

[0028] As shown in Figures 6(b) and 6(c), the mesh portion 6b has multiple through holes 6b1 formed in a so-called 60° staggered arrangement of circular holes. Chamfered portions 6b3 and 6b2 are formed on the opening edges before and after the through holes 6b1, respectively.

[0029] As shown in Figure 7, the sound-absorbing member 7 is formed in a cylindrical shape with through holes of inner diameter d7, for example, using a porous material made of propylene resin. The sound-absorbing member 7 is set so that its outer diameter D7 is a slightly tight fit with respect to the inner diameter d6 of the cup base 61 of the mesh cup 6. Specifically, the sound-absorbing member 7 can be inserted into the inside of the cup base 61 by manually pushing it in until its first end 7a abuts against the stepped portion 6c. The sound-absorbing member 7 can also be removed from the cup base 61 by manually pulling it out. The sound-absorbing member 7 attached to the cup base 61 is fitted tightly enough so that it will not fall out of the cup base 61 under its own weight.

[0030] The procedure for assembling the hood 53, mesh cup 6, and sound-absorbing member 7 to the cover 51 and inner cover 52 as the head portion 5 of the first embodiment shown in Figure 3 will be explained with reference to Figures 3 and 8.

[0031] First, as shown in Figure 8, the sound-absorbing member 7 is attached to the mesh cup 6 with its bottom 62 facing the rear, by pushing it in until its first end 7a contacts the stepped portion 6c. Next, as indicated by arrow DR1, the mesh cup 6 is inserted into the inside of the hood 53. Then, the female threaded portion 531a of the hood 53 and the male threaded portion 6a of the mesh cup 6 are screwed together and screwed in until the second end portion 7b of the sound-absorbing member 7 contacts the guide end portion 532a of the hood 53. The guide end portion 532a is in a position to interfere radially with the second end portion 7b of the sound-absorbing member 7. As previously described, the inner diameter d7 of the sound-absorbing member 7 and the inner diameter d1 of the guide end 532a of the intake guide section 532 in the hood 53 are the same. As a result, as shown in Figure 3, the inner surface 532c of the intake guide section 532, which is formed by a curved surface whose inner diameter decreases towards the inside, and the inner circumferential surface 7c of the sound-absorbing member 7, which has a constant inner diameter, are smoothly connected without any steps.

[0032] The assembled sound-absorbing member 7, mesh cup 6, and hood 53 are then inserted into the inner cover 52 (see Figure 8: arrow DR2). As shown in Figure 3, the inserted integral is fixed to the inner cover 52 by a locking mechanism (not shown) when the bottom 62 of the mesh cup 6 comes into contact with the first step 52a of the inner cover 52, or just before it comes into contact with the first step 52a. Since the hood 53 is made of a light-transmitting material, it can pass through the light emitted from the light-emitting element 182 and illuminate the direction pointed by the head 5.

[0033] In the first embodiment, which is the configuration of the head portion 5 shown in Figure 3, the sound-absorbing member 7 and the mesh portion 6b are arranged in that order from the suction port 19 side. That is, the mesh cup 6 is inserted into the inner cover 52 with the mesh portion 6b facing inwards. The air drawn in by the operation of the suction device 3 is drawn in through the suction port 19, passes through the intake guide section 532, the space V7 surrounded by the inner circumferential surface 7c of the sound-absorbing member 7, and then passes through the mesh section 6b. The air that flows through the mesh section 6b encounters resistance, generating a louder sound compared to when it flows through other parts.

[0034] In the first embodiment of the head unit 5, the sound-absorbing member 7 is positioned on the suction port 19 side of the mesh unit 6b. As a result, of the sound generated in the mesh unit 6b, the sound Sd1 directed toward the sound-absorbing member 7 is absorbed by the sound-absorbing member 7, and only the remaining sound Sd2 directed toward the suction port 19 is released to the outside from the suction port 19 and can be heard by the operator. As a result, the volume of the intake sound heard by an external operator is reduced, making it less likely to be perceived as noise.

[0035] Furthermore, in the head section 5, the air drawn in by the operation of the suction device 3 passes through the space V532 (see Figure 3) surrounded by the inner surface 532c of the intake guide section 532, and is smoothly guided into the space V7 surrounded by the continuously connected inner circumferential surface 7c without any abrupt changes in inner diameter. As a result, turbulence in the airflow is well suppressed in the path from the outside to the mesh section 6b, and the suction noise generated in the path from the intake guide section 532 to the mesh section 6b is small.

[0036] The suction arm 1 may use a head portion 5A configured in the second embodiment instead of the head portion 5 configured in the first embodiment. Next, the second embodiment will be described with reference to Figures 9 and 10. In the second embodiment, which is the configuration of the head portion 5A shown in Figure 10, the mesh portion 6b and the sound-absorbing member 7 are arranged in that order from the suction port 19 side. In other words, in the second embodiment, the orientation of the mesh cup 6 and the sound-absorbing member 7 in the direction of the axis CL5 of the head portion 5 is reversed compared to the first embodiment.

[0037] First, as shown in Figure 9, insert the mesh cup 6 into the hood 53 from the bottom 62 side, with the bottom 62 facing the suction port 19. Then, screw the female threaded portion 531a and the male threaded portion 6a together and screw it in until the bottom 62 contacts the guide end 532a of the hood 53 (see arrow DR3). Next, the sound-absorbing member 7 is pushed in and attached until its second end 7b contacts the stepped portion 6c of the mesh cup 6 (see arrow DR3).

[0038] The assembled sound-absorbing member 7, mesh cup 6, and hood 53 are then inserted into the inner cover 52 (see arrow DR5). As shown in Figure 10, when the first end 7a of the sound-absorbing member 7 comes into contact with the first stepped portion 52a of the inner cover 52, or just before contact, a locking mechanism (not shown) acts to fix the inserted integral to the inner cover 52.

[0039] The air drawn in by the operation of the suction device 3 is drawn in through the suction port 19, passes through the suction guide section 532, and then through the mesh section 6b. After passing through the mesh section 6b, it passes through the space V7 surrounded by the inner circumferential surface 7c of the sound-absorbing member 7, and then through the ventilation passage AK towards the suction device 3.

[0040] As previously described, when air passes through the mesh section 6b, it produces a louder suction sound than when it flows through other parts. In the second embodiment, the mesh section 6b is close to the suction port 19 and no sound-absorbing member is placed on the suction port 19 side of the mesh section 6b, so the operator hears a louder suction sound than in the first embodiment. On the other hand, in the second embodiment, since the mesh portion 6b is located close to the suction port 19, the operator can easily remove unwanted materials that were sucked in by the operation of the suction device 3 and could not pass through the mesh portion 6b.

[0041] The suction arm 1 can be configured in either a first or second form, depending on the installation environment and the content of the dental treatment and procedure. If reducing suction noise is the priority, the head portion 5 of the first form should be selected, while if removing unwanted objects caught in the mesh portion 6b is the priority, the second form should be selected. The suction arm 1 allows for the selection of either the head portion 5 of the first embodiment or the head portion 5A of the second embodiment as the head portion, with only a difference in simple assembly work, without the need to add any new parts.

[0042] As shown in Figure 3, the distance Lt is defined as the distance in the axial direction CL5 from the guide end 532a of the hood 53 in the head portion 5 to the first stage portion 52a of the inner cover 52. If the axial length of the sound-absorbing member 7 is distance L1, the distance from the bottom 62 of the mesh cup 6 to the first stage 52a in the direction of axis CL5 is distance L2, and the thickness of the bottom 62 is distance L3, Length L1 ≈ Distance L1 + Distance L2 + Distance L3 That's how it is. Furthermore, the threaded portion SC between the female threaded portion 531a and the male threaded portion 6a is positioned to include the center of the length L1 range. This makes it possible to select between the configuration of the first and second embodiments using the same components.

[0043] As shown in Figures 3 and 10, the head portions 5 and 5A are set to a certain distance L2, so a space V67 is formed between the bottom portion 62 of the mesh cup 6 and the first stage portion 52a. Therefore, the sound-absorbing member 7 and the mesh portion 6b are not in close contact. As a result, turbulence is less likely to occur when the drawn-in air passes through the mesh section 6b, which has high resistance, and the volume of intake noise generated in the mesh section 6b is suppressed. The predetermined value of distance L2 should be set to be greater than or equal to, for example, distance L3, which is the thickness of the bottom 62. As a result, the volume of space V67 is sufficiently increased, and the inhaled air passes through space V7 inside the sound-absorbing member 7. The airflow is well-regulated and the flow velocity is reduced to some extent from the point where it enters the expanded space V67 until it reaches the mesh section 6b, thus further suppressing the volume of intake noise generated in the mesh section 6b.

[0044] In a comparison of intake sound volume between the head unit 5 of the first embodiment and the head unit 5A of the second embodiment, it was confirmed that, under the same conditions, the head unit 5 of the first embodiment reduced the noise level by approximately 3 dB compared to the head unit 5A of the second embodiment. Thus, the suction arm 1 not only provides a head portion 5 in a first embodiment that significantly reduces intake noise, but also allows selection between a head portion 5A in a second embodiment that offers superior maintainability and a suction noise reduction head portion 5A, using the same components, depending on the priority between reduced suction noise and maintainability, thereby greatly improving convenience for the operator.

[0045] The embodiments of the present invention are not limited to the configurations and procedures described above, and may be modified without departing from the spirit of the invention.

[0046] Depending on the material, the sound-absorbing member 7 may have relatively large variations in its outer diameter, making it difficult to forcefully and stably fit the sound-absorbing member 7 to the cup base 61 of the mesh cup 6. In this case, the sound-absorbing member 7 may be formed with a standard dimension in which its outer diameter D7 is always smaller than the inner diameter d7 of the cup base 61, even including variations, and inserted into the mesh cup 6 with some radial play. In this case, the sound-absorbing member 7 is prevented from coming off by being inserted in the axial direction, which allows for relatively stable dimensional maintenance. Alternatively, an elastic member (for example, an annular sponge member) may be interposed between the sound-absorbing member 7 and the cup base 61 to fill the gap and eliminate radial play. The second embodiment is selected with priority given to maintainability over intake noise reduction. Therefore, in the second embodiment, the sound-absorbing member 7 may not be inserted into the hood 53, and only the mesh cup 6 may be attached in the opposite direction to that of the first embodiment.

[0047] The suction arm 1 is not limited to being installed on the floor level (FL). For example, it may be installed so as to be suspended from the ceiling of the dental treatment room. Alternatively, the suction machine 3 may be housed in a movable enclosure within the dental treatment room, a suction arm 1 may be attached to the top of the enclosure, and the suction machine 3 and the suction arm 1 may be connected by a ventilation passage inside the enclosure, thereby creating a movable system in which the suction arm 1 and the suction machine 3 are integrated. [Explanation of symbols]

[0048] 1. Suction arm (dental extraoral suction arm) 10 bases 11-15 First Arm Section to Fifth Arm Section 15a~15c First Elbow~Third Elbow 151 First Link Axis Joint 152 First offset joint 153. Second offset joint 154 Second Link Axis Joint 156 Release Button 16 Switch Rings 161 Suction switch 17 Handle 171 Light switch 18 Lighting equipment 181 circuit boards 182 Light-emitting element 19 Suction port 21-23 First joint to third joint 3 Suction machine 31 pumps 32 Control Unit 4 Valve device 40 motors 41. First ventilator 42. Second tracheal vent 43 Exhaust pipe 5.5A Head section 51 Cover 511 Inner Circumference Rib 512 Retaining ring 52 Inner cover 52a First section 52b Second paragraph 521 Outer perimeter rib 53 Food 531 Main body cylindrical section 531a Female thread section 532 Intake Induction Section 532a Leading end 532c Interior 533 Tsuba (guard) 6 Mesh Cups 6a Male threaded section 6b Mesh section 6b1 Through hole 6b2, 6b3 Chamfered section 6c Stepped section 61 cup base 62 Bottom 7 Sound-absorbing material 7a First end 7b Second end 7c Inner surface AK ventilation channel AR1~AR3 1st area~3rd area CL5,CL6 axis line CL21~CL23 1st axis~3rd axis d1,d7,d6 Inner diameter D6 diameter FL floor Lt,L1~L3 distance SC threaded part Sd1, Sd2 sound ST Dental Extraoral Suction System V7,V532,V67 Space

Claims

1. It is configured to have multiple degrees of freedom, including a head portion having an air intake port on its tip surface, and a plurality of arm portions arranged at the tip of the head portion and connected in series. The head portion is, An inner cover formed in the shape of a cylindrical tube, A mesh cup comprising a cylindrical cup base that can be inserted into the inner cover, and a mesh portion, with a bottom provided at one end of the cup base, A cylindrical sound-absorbing member is inserted and mounted inside the base of the cup, The inner cover comprises a hood that has an intake guide portion which serves as the suction port and is detachably attached to the tip of the inner cover, The mesh cup is inserted into the inner cover with the mesh portion facing inwards, with the sound-absorbing member inserted and mounted on the base of the cup. The end of the intake guide portion of the hood is positioned to interfere radially with the end of the sound-absorbing member inserted into the mesh cup, opposite to the bottom portion, in a dental extraoral suction arm.

2. The dental extraoral suction arm according to claim 1, wherein the intake guide portion is formed in a funnel shape with a longitudinal cross-sectional shape that is a curve that is convex inward, and the inner diameter of the end of the intake guide portion matches the inner diameter of the sound-absorbing member.

3. The dental extraoral suction arm according to claim 1, wherein when the axial orientation of the mesh cup and the head portion of the sound-absorbing member is set to the orientation of the first embodiment, the hood can be attached to the tip of the inner cover even when the mesh cup is set to the second embodiment which is the opposite orientation to the first embodiment.

4. The dental extraoral suction arm according to claim 1 or claim 2, wherein a space with a diameter larger than the inner diameter of the sound-absorbing member is provided between the sound-absorbing member and the bottom portion.

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