WO2023210206A1

WO2023210206A1 - Dental-use oral suction arm and dental-use oral suction system

Info

Publication number: WO2023210206A1
Application number: PCT/JP2023/010514
Authority: WO
Inventors: 欣央庄司; 友樹田邉; 尚也新田
Original assignee: 株式会社東京技研
Priority date: 2022-04-27
Filing date: 2023-03-17
Publication date: 2023-11-02
Also published as: JP2023162846A

Abstract

A dental-use oral suction arm (1) comprises: a plurality of arms (11-15) that are serially linked via rotatable joints or torsion joints; and a head (20) that is linked by a first torsional joint (154) to the first arm (15) among the plurality of arms (11-15) and that has a suction opening (19) on the tip surface of the head. The first arm (15) is linked by a second torsion joint (151) to the second arm (14) in sequence, and the first arm (15) is configured to include a plurality of elbows (15a-15c) that are serially linked to each other via torsion joints (152, 153).

Description

Dental extraoral suction arm and dental extraoral suction system

The present invention relates to a dental extraoral suction arm and a dental extraoral suction system.

Patent Document 1 discloses a suction arm in which a plurality of pipes are connected in series and relatively rotatably via a rotating part, and has a flexible pipe at its tip and a suction hood connected to the flexible pipe, which is used in a dental clinic. It is described as a pollution prevention device.
The suction arm described in Patent Document 1 can arbitrarily set the vertical height of the suction hood (hereinafter referred to as the head part) by rotating each pipe via a rotating part, and the head part can be set as desired by the flexible pipe. You can change the orientation direction of the section.

Such a suction arm is installed on the floor of a dental clinic and connected to a suction device. Air is sucked from the suction hood by the operation of the suction device, and is used for extraoral suction to remove cutting dust, liquid droplets, etc. generated during dental treatment and surgery.

Japanese Patent Application Publication No. 7-088119

The suction arm described in Patent Document 1 can change the orientation direction of the suction hood by bending the flexible pipe.
However, the range of orientation of the head that can be changed by bending the flexible pipe is relatively narrow. Therefore, for use in dental treatment and surgery, there is a demand for a suction arm that can more freely change the orientation direction of the head over a wider range.

Therefore, the problem to be solved by the present invention is to provide a dental extraoral suction arm and a dental extraoral suction system that can change the orientation direction of the head part more freely over a wide range.

In order to solve the above problems, the present invention has the following configuration.
1) A plurality of arm parts connected in series via rotation joints or torsion joints, and a head part connected to the distal end arm part of the plurality of arm parts by a first torsion joint and having a suction port on the distal end surface. Prepare,
The distal arm section is connected to the second arm section from the distal end by a second torsion joint,
The distal arm portion is a dental extraoral suction arm that includes a plurality of elbows connected in series via torsion joints.
2) The plurality of elbows are a first elbow curved at a curve angle θa from the second arm side, a second elbow curved at a curve angle θb, and a third elbow curved at a curve angle θc,
The dental extraoral suction arm according to item 1), wherein the sum of the bending angle θa, the bending angle θb, and the bending angle θc is 180°.
3) The dental extraoral suction arm according to 2), wherein the bending angle θa and the bending angle θc are 45°, and the bending angle θb is 90°.
4) The first elbow, the second elbow, and the third elbow are formed with a length that allows the axis of the second arm portion to coincide with the axis of the head portion. This is a dental extraoral suction arm.
5) The dental extraoral suction arm described in any one of 1) to 4);
a suction machine,
a ventilation pipe connecting the dental extraoral suction arm and the suction machine;
Equipped with
The dental extraoral suction arm has an internal ventilation path that opens to the suction port at one end and connects to the ventilation pipe at the other end,
The dental extraoral suction system sucks air from the suction port by operating the suction machine.

According to the present invention, it is possible to obtain the effect that the orientation direction of the head portion can be changed more freely over a wide range.

FIG. 1 is a configuration diagram showing a dental extraoral suction system ST, which is an example of the dental extraoral suction system according to an embodiment of the present invention. FIG. 2 is an external view showing the distal end portion of the suction arm 1 included in the dental extraoral suction system ST. FIG. 3 is a side view schematically showing the rotation range of the suction arm 1. FIG. 4 is a link diagram for explaining the serial link configuration of the suction arm 1. FIG. 5A is a plan view showing the link of the fifth arm portion 15 in the first posture. FIG. 5B is a diagram of the link in the first posture shown in FIG. 5A viewed from the tip side. FIG. 5C is an external view of the fifth arm portion 15 in the first posture. FIG. 6A is a plan view showing the link of the fifth arm portion 15 in the second posture. FIG. 6B is a diagram of the link in the second posture shown in FIG. 6A, viewed from the tip side. FIG. 6C is an external view of the fifth arm portion 15 in the second posture. FIG. 7A is a plan view showing the link of the fifth arm portion 15 in the third posture. FIG. 7B is a diagram of the link in the third posture shown in FIG. 7A, viewed from the tip side. FIG. 7C is an external view of the fifth arm portion 15 in the third posture. FIG. 8A is a perspective view showing the link of the fifth arm portion 15 in the fourth posture. FIG. 8B is an external view of the fifth arm portion 15 in the fourth posture.

The dental extraoral suction arm and the dental extraoral suction system according to the embodiments of the present invention are the dental extraoral suction arm 1 (hereinafter referred to as suction arm 1) and the dental extraoral suction system ST (hereinafter referred to as , suction system ST).

(Example)
FIG. 1 is a configuration diagram showing a suction system ST which is an example of a dental extraoral suction system according to an embodiment of the present invention. FIG. 2 is an external view showing the distal end portion of the suction arm 1 included in the suction system ST. FIG. 3 is a side view schematically showing the rotation range of the suction arm 1. FIG. 4 is a link diagram for explaining the serial link configuration of the suction arm 1.
Arrows DR1 to DR3 in FIG. 1 and arrows DR3 to DR7 in FIG. 2, which indicate the rotation directions of the joints, correspond to arrows DR1 to DR7 in FIG. 4, respectively.

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 51, and the valve device 4 and the suction machine 3 are connected by a second ventilation pipe 52.
The suction device 3 is further connected to an exhaust pipe 53 for exhausting the air to the outside space.
The suction arm 1 and the valve device 4 are installed on the floor FL in the dental clinic. The suction machine 3 is usually installed in a machine room or the like separate from the dental clinic, and the second ventilation pipe 52 is laid under the floor FL.

The suction device 3 includes a pump 31 and a control section 32. The control unit 32 may be included in the valve device 4.
Air is sucked from the second ventilation pipe 52 by the operation of the pump 31 . The second ventilation pipe 52 is connected to the suction port 19 on the distal end surface of the suction arm 1 via the valve device 4, the first ventilation pipe 51, and the ventilation path AK (see FIG. 2).
When the valve of the valve device 4 opens and the suction machine 3 operates, external air is sucked into the suction machine 3 through the suction port 19.
The air sucked into the suction device 3 is discharged from the exhaust pipe 53 to the outside space after cutting dust, bacteria, viruses, etc. generated during treatment are removed by a filter (not shown) provided in the suction device 3. Ru.
The control unit 32 controls the entire operation of the suction system ST including the pump 31 and the valve device 4.

The valve device 4 includes a motor 41 and an on-off valve (not shown), and is installed on the floor FL of the treatment room in this example. The valve device 4 may be installed under the floor.
The on-off valve opens and closes ventilation between the first ventilation pipe 51 and the second ventilation pipe 52 by the operation of the motor 41. The operation of the motor 41 is controlled by the control section 32.

The suction arm 1 is a so-called vertical multi-joint type arm having a plurality of arm parts, and whose posture can be changed manually.
As shown in FIGS. 1 and 4, the suction arm 1 includes, from the floor FL side, a pedestal 10 (omitted in FIG. 4), a first arm part 11, a second arm part 12, and a third arm part. 13, a fourth arm portion 14, a fifth arm portion 15, and a head portion 20. In addition, the suction arm 1 includes a first joint 21, a second joint 22, a third joint 23, a fourth joint 151, a fifth joint 152, a sixth joint 153, and a seventh joint as joint groups from the floor FL side. It has 154. The fifth arm portion 15 is also referred to as the tip arm portion 15.

The pedestal 10 is a seat portion fixed to the floor FL.
The first arm portion 11 is a straight tube-shaped support that extends vertically upward from the pedestal 10 .
As shown in FIGS. 1 and 4, a first joint 21 is provided at the upper end of the first arm portion 11. As shown in FIGS.
The first joint 21 connects the second arm portion 12 to the first arm portion 11 so as to be rotatable about a rotation axis CL21 horizontal to the floor FL with a predetermined torque or more.
The second arm portion 12 is formed into a straight tube shape.
As shown in FIG. 3, the rotation range of the second arm portion 12 by the first joint 21 is a range of angle θ1 counterclockwise in FIG. 3 from the vertically upwardly extending posture. The angle θ1 is, for example, 75°.

As shown in FIGS. 1 and 4, a second joint 22 is provided at the tip of the second arm portion 12. As shown in FIGS.
The second joint 22 connects the third arm portion 13 to the second arm portion 12 so as to be rotatable about a rotation axis CL22 horizontal to the floor FL with a predetermined torque or more.
The third arm portion 13 is formed into a straight tube shape.
As shown in FIG. 3, the rotation range of the third arm portion 13 by the second joint 22 is a range of angle θ2 clockwise in FIG. 3 from the posture along the second arm portion 12. The angle θ2 is, for example, 150°.

As shown in FIGS. 1, 2, and 4, a third joint 23 is provided at the tip of the third arm portion 13. As shown in FIGS.
The third joint 23 connects the fourth arm portion 14 to the third arm portion 13 so as to be rotatable about a rotation axis CL23 horizontal to the floor FL with a predetermined torque or more.
The fourth arm portion 14 is formed into a straight tube shape that is shorter than the first to third arm portions 11 to 13.
As shown in FIG. 3, the rotation range of the fourth arm portion 14 by the third joint 23 is an angle θ3 clockwise in FIG. 3 and an angle θ4 counterclockwise in FIG. range. The angle θ3 is, for example, 165°, and the angle θ4 is, for example, 45°.
The first to third joints 21 to 23 are rotation joints having rotation axes in a direction perpendicular to the axis of the arm portion.

As shown in FIGS. 1 and 2, the fourth arm portion 14 is equipped with an annular switch ring 16. A part of the switch ring 16 in the circumferential direction is raised outward in the radial direction, and a suction switch 161, which is a first switch, is attached to a surface on the tip side of the raised part.

The suction switch 161 is composed of, for example, a proximity sensor. By placing a hand close to the suction switch 161, a suction signal is outputted to the control unit 32 each time. The control unit 32 controls the operation of the suction machine 3 based on the suction signal.
The switch ring 16 can be rotated around the axis CL14 (see FIG. 2) of the fourth arm 14 with a predetermined resistance of the fourth arm 14, thereby adjusting the circumferential position of the suction switch 161 according to the operator's preference. You can change it to any position you like.

As shown in FIGS. 2 and 4, a fourth joint 151 is provided at the distal end of the fourth arm section 14, and the fifth arm section 15, which is the distal arm section, is connected via the fourth joint 151. connected. That is, the fourth arm section 14 becomes the second arm section from the distal end side.
The fifth arm portion 15 includes a plurality of elbows connected in series. The plurality of elbows are, from the fourth arm portion 14 side, a first elbow 15a, a second elbow 15b, and a third elbow 15c.
Further, the fifth arm portion 15 includes a fifth joint 152 that connects the first elbow 15a and the second elbow 15b, and a sixth joint 153 that connects the second elbow 15b and the third elbow 15c.

The fourth joint 151 connects the first elbow 15a of the fifth arm section 15 to the fourth arm section 14 so as to be rotatable around the axis CL14 of the fourth arm section 14 (see arrow DR4). .

The first elbow 15a has a curved angle θa of 45° between the connecting surface of the first end connected to the fourth joint 151 and the connecting surface of the second end opposite thereto. , formed into a tubular shape with a smoothly curved shape. That is, the first elbow 15a is a curved tube that is smoothly bent such that the bending angle θa between the axis CL14 of the connecting surface of the first end and the axis CLa of the connecting surface of the second end is 45°. There is.

The fifth joint 152 connects the second elbow 15b to the first elbow 15a so as to be rotatable around the axis CLa (see arrow DR5).
The second elbow 15b is smoothly curved so that the angle θb between the connecting surface of the first end connected to the fifth joint 152 and the connecting surface of the second end opposite thereto forms 90°. It is formed into a tubular shape. That is, the second elbow 15b is a curved tube that is smoothly bent such that the angle θb between the axis CLa of the connecting surface of the first end and the axis CLb of the connecting surface of the second end is 90°. .

The sixth joint 153 connects the third elbow 15c to the second elbow 15b so as to be rotatable around the axis CLb (see arrow DR6).
The third elbow 15c is smoothly curved so that the angle θc between the connecting surface of the first end connected to the sixth joint 153 and the connecting surface of the second end opposite thereto is 45°. It is formed into a tubular shape. That is, the third elbow 15c is a curved tube that is smoothly bent so that the angle θc between the axis CLb of the connecting surface of the first end and the axis CLc of the connecting surface of the second end is 45 degrees. .

The seventh joint 154 connects the head portion 20 to the third elbow 15c so as to be rotatable around the axis CLc (see arrow DR7). That is, the fifth arm portion 15 connects the head portion 20 via the seventh joint 154 so as to be rotatable around the axis CLc. The axis CL20 of the head portion 20 coincides with the axis CLc.

The fourth joint 151 to the seventh joint 154 are rotatable when a torque of a predetermined value or more is applied. The rotatable angular range of each of the fourth joint 151 to the seventh joint 154 is, for example, 330°.
The fourth joint 151 to the seventh joint 154 are torsion joints that twist and rotate around the axes of the arm portion and the elbow.

As shown in FIG. 2, the head portion 20 is formed in the shape of a truncated cone whose outer diameter slightly expands toward the tip. The head portion 20 is provided with a handle 17 and a release button 156. An annular hood 155 is removably attached to the tip of the head section 20.

The hood 155 is made of a light-transmitting resin, and is automatically positioned and locked onto the head section 20 by being pushed in from the distal end side of the head section 20. The hood 155 is unlocked by pushing the release button 156 and can be removed from the head section 20.
A suction port 19 is opened in the center of the front end surface of the hood 155, and an annular lighting device 18 having a light emitting element such as an LED is arranged around the suction port 19. The illumination device 18 illuminates through the hood 155 in the direction toward which the head section 20 is directed.

The handle 17 is formed in a protruding L-shape so that the operator of the suction arm 1 can grasp it by hand.
A lighting switch 171 is attached to the tip of the handle 17. The lighting switch 171 is a push button switch, and is pressed by the finger of the hand holding the handle 17 to send out a lighting signal to the control unit 32. The control unit 32 controls turning on/off the lighting device 18 based on the lighting signal.

Inside the suction arm 1, an air passage AK (see FIG. 2) is formed that connects the head portion 20 to the pedestal 10. One end of the ventilation path AK is connected to the suction port 19 and opens to the external space, and the other end is connected to the first ventilation pipe 51.

With this configuration, when the pump 31 operates, the on-off valve of the valve device 4 becomes open, and outside air is sucked through the suction port 19. The sucked outside air enters the suction machine 3 through the ventilation path AK, the first ventilation pipe 51, the valve device 4, and the second ventilation pipe 52, passes through a filter (not shown) inside the suction machine 3, and is purified. and is exhausted to the outside from the exhaust pipe 53.

The suction arm 1 changes its posture so that the direction in which the head section 20 is directed becomes the desired direction by the operator grasping the handle 17 of the head section 20 and arbitrarily moving each joint to rotate, thereby reducing the force. Once removed, it remains in that state.
As a result, air near the oral cavity can be suctioned well during dental treatment and surgery, and droplets such as cutting dust and body fluids that are scattered in the space near the oral cavity during treatment can be effectively removed.

As shown in FIG. 2, the first elbow 15a to the third elbow 15c have no straight parts and are arcuate with the same curvature, and the directions of the axes are tilted at 45 degrees in the first elbow 15a and the third elbow 15c. The second elbow 15b is a curved pipe that is bent at an angle of 90 degrees.
The inner and outer diameters of the first to third elbows 15a to 15c in the direction orthogonal to the axis are approximately equal to the inner and outer diameters of the fourth arm portion 14, respectively.
Therefore, the amount DH of the outer shape of the second elbow 15b in the direction perpendicular to the axis CL14, based on the axis CL14 of the fourth arm 14, is approximately equal to the outer diameter of the fourth arm 14 at the maximum. It's extremely small.

Further, the ventilation passage AK inside the fifth arm portion 15 is smoothly curved like the first to third elbows 15a to 15c. Therefore, the sucked air flows smoothly inside the air passage AK with little resistance.
Thereby, the suction arm 1 and the suction system ST have high suction efficiency.

Further, since the amount of protrusion DH is small, the suction arm 1 occupies a small space when the head portion 20 is in a posture approaching the oral cavity in dental treatment and surgery.
As a result, the suction arm 1 is less likely to interfere with other dental equipment and treatment assistants, and is very easy to install in a treatment room and to control posture.

Next, the possible postures of the fifth arm section 15 will be explained based on the link diagram of FIG. 4, with first to fourth postures being shown as representative postures.
For convenience, as shown in FIG. 5A, the bending points of the axes of the first elbow 15a and the third elbow 15c, which are curved pipes with a bending angle of 45 degrees, are set as points P1 and P3, respectively. Similarly, the bending point of the second elbow 15b, which is a curved pipe with a bending angle of 90 degrees, is set as point P2.

(First posture) (See Figures 4 and 5A to 5C)
The first posture is a mode in which the fifth arm portion 15 is extended as straight as possible. In the suction arm 1, the axis CL14 and the axis CL20 can be aligned as a straight line.
Specifically, the bending directions of the first to third elbows 15a to 15c in the fifth arm portion 15 are different from each other by 180° between the first elbow 15a and the third elbow 15c and the second elbow 15b.
Specifically, in FIG. 4, the bending angles θa to θc of the first to third elbows 15a to 15c are as follows.

The first elbow 15a has a bending angle θa (45°), the second elbow 15b has a bending angle θb (90°), and the third elbow 15c has a bending angle θc (45°).
At this time, bending angle θa+curving angle θb+curving angle θc becomes 180°. That is, in the first posture, the bending angle of the first to third elbows 15a to 15c as a whole is 180° and is not curved, and the axis CL14 and the axis CL20 are parallel.
Further, since the first elbow 15a to the third elbow 15c have no linear portion and are formed in an arc shape with the same curvature, the axis CL14 and the axis CL20 coincide without deviation, and the suction arm 1 The fourth arm portion 14 and the head portion 20 are in a posture extending in the same straight line.

FIG. 5B is a view of the link configuration in the first posture shown in FIG. 5A viewed from the tip side of the axis CL20 (lower side of FIG. 5A), and FIG. 5C is a view of the actual fifth arm portion of the suction arm 1. 15 and the head portion 20 in a state close to the first posture.
As shown in FIG. 5B, the first elbow 15a to the third elbow 15c are located to be included in the same virtual plane SF, and the fifth arm part 15 protrudes in a direction orthogonal to the virtual plane SF. The head portion 20 at the tip can be placed in a straight position from the fourth arm portion 14 in a spatially compact manner without being curved.

(Second posture) (See Figures 6A to 6C)
As shown in FIG. 6A, the second posture rotates the sixth joint 153 by 180 degrees with respect to the first posture, reverses the direction in which the third elbow 15c curves, and moves the head portion 20 with respect to the axis CL14. This is an embodiment in which the directions are perpendicular to each other.
That is, the second posture is an aspect in which the bending directions of the first to third elbows 15a to 15c are different by 180 degrees between the first elbow 15a, the second elbow 15b, and the third elbow 15c.

6B is a diagram of the link configuration in the second posture shown in FIG. 6A viewed from the tip side of the axis CL14 (lower side of FIG. 6A), and FIG. 6C is a diagram of the fifth arm of the actual suction arm 1. FIG. 4 is a diagram showing a second posture of the portion 15 and the head portion 20;
As shown in FIG. 6B, the first elbow 15a to the third elbow 15c are located so as to be included in the same virtual plane SF, and the fifth arm portion 15 protrudes in a direction perpendicular to the virtual plane SF. The head portion 20 at the distal end can be oriented in a direction perpendicular to the axis CL14 of the fourth arm portion 14 in a spatially compact manner without being curved.

(Third posture) (See Figures 7A to 7C)
As shown in FIG. 7A, in the third posture, the fourth joint 151 to the sixth joint 153 are rotated by 180 degrees with respect to the first posture, so that the head section 20 faces in the direction of returning to the fourth arm section 14. This is an aspect in which the image is reversed by 180°.
That is, the third posture is a mode in which the first to third elbows 15a to 15c are all curved in the same direction.

7B is a diagram of the link configuration in the third posture shown in FIG. 7A, viewed from the direction of axis CL14 (downward side of FIG. 7A), and FIG. 7C is a diagram of the actual fifth arm portion of the suction arm 1. 15 and the head portion 20 in a third posture. FIG.
As shown in FIGS. 7B and 7C, the first elbow 15a to the third elbow 15c are located so as to be included in the same virtual plane SF, and the fifth arm portion 15 is perpendicular to the virtual plane SF. The head portion 20 at the distal end can be placed in a position parallel to the fourth arm portion 14 and inverted toward the fourth arm portion 14 side in a spatially compact manner without protruding and curving in the direction.

(Fourth posture) (See Figures 8A and 8B)
FIG. 8A is a perspective link diagram of the fifth arm portion 15 in the fourth posture. FIG. 8A also includes the third joint 23 and the fourth arm portion 14. In FIG. 8A, a plane that includes the axis CL14 of the fourth arm portion 14 and is parallel to the rotation axis CL23 of the third joint 23 is defined as a virtual plane SF1. FIG. 8B shows an actual aspect of the fifth arm portion 15 corresponding to FIG. 8A.

As shown in FIGS. 8A and 8B, the fifth arm portion 15 appropriately selects the rotation angles of the fourth joint 151 to the sixth joint 153 to set the direction of the axis CL20 in an arbitrary direction with respect to the virtual plane SF1. You can create a diagonal posture with this button. Thereby, the fifth arm section 15 can more freely direct the head section 20 in any direction.

In this way, in the suction arm 1, even when the axis CL20 of the head section 20 is directed in a direction not included in the virtual planes SF, SF1, the maximum amount of protrusion DH of the second elbow 15b in the fifth arm section 15 is small. Therefore, the space occupied by the fifth arm portion is small, and the head portion 20 can be placed in any desired posture in a spatially compact manner.

The embodiments of the present invention are not limited to the configuration and procedure described above, and modifications may be made without departing from the gist of the present invention.

Any of the first joint 21 to third joint 23 and fourth joint 151 to seventh joint 154 may be provided with a rotation scale M that allows the amount of rotation to be visually recognized.
The rotation scale M is shown, for example, at the fourth joint 151 and the fifth joint 152 in FIG. By providing such rotation scales M in the joints, it is possible to record and store the angles of each joint that make the head section 20 point in a desired direction, and to reproduce them with high precision.

The bending angles θa, θb, and θc of the first to third elbows 15a to 15c are not limited to the above combination of 45°, 90°, and 45°, respectively.
If the combination allows one of the values to be a negative value so that the total is 0°, the axis CL20 of the head section 20 and the axis CL14 of the fourth arm section 14 are at least parallel to each other, and the head section 20 is connected to the fourth arm section 14. They can be oriented in the same direction. For example, it is a combination of angle θa=30°, angle θb=120°, and angle θc=30°.

The number of elbows constituting the fifth arm portion 15 is not limited to the three mentioned above, and may be four or more. The more elbows there are, the more free the posture can be. An increase in the number of elbows increases the cost, so if priority is given to suppressing the cost increase, the above three are preferable.

The suction arm 1 is not limited to being installed on the floor FL. For example, it may be installed so as to be suspended from the ceiling of a dental clinic.
In addition, the suction machine 3 is housed in a housing that can be moved within the dental clinic, the suction arm 1 is attached to the upper part of the housing, and the suction machine 3 and the suction arm 1 are connected by an air passage inside the housing. , the suction arm 1 and the suction device 3 may be integrated into a movable system.

1 Suction arm (dental extraoral suction arm)
10 Pedestal 11 to 15 First arm part to fifth arm part 15a to 15c First elbow to third elbow 151 to 154 Fourth joint to seventh joint 155 Hood 156 Release button 16 Switch ring 161 Suction switch 17 Handle 171 Lighting switch 18 Lighting device 19 Suction port 20 Head portion 21 to 23 First joint to third joint 3 Suction machine 31 Pump 32 Control unit 4 Valve device 41 Motor 51 First ventilation pipe, 52 Second ventilation pipe, 53 Exhaust pipe AK Ventilation path CLa, CLb, CLc, CL14, CL20 Axis CL21 to CL23 Rotation axis DH Overhang amount FL Floor M Rotation scale SF, SF1 Virtual plane ST Suction system (dental extraoral suction system)
θ1, θ2, θ3, θ4 Angle θa, θb, θc Curving angle

Claims

comprising a plurality of arm parts connected in series via rotation joints or torsion joints, and a head part connected to the distal end arm parts of the plurality of arm parts by a first torsion joint and having a suction port on the distal end surface,
The distal arm section is connected to the second arm section from the distal end by a second torsion joint,
The dental extraoral suction arm includes a plurality of elbows connected in series through a torsion joint.
The plurality of elbows are a first elbow curved at a curve angle θa from the second arm side, a second elbow curved at a curve angle θb, and a third elbow curved at a curve angle θc,
The dental extraoral suction arm according to claim 1, wherein the sum of the curved angle θa, the curved angle θb, and the curved angle θc is 180°.
The dental extraoral suction arm according to claim 2, wherein the bending angle θa and the bending angle θc are 45°, and the bending angle θb is 90°.
4. The dental device according to claim 3, wherein the first elbow, the second elbow, and the third elbow are formed with a length that allows the axis of the second arm portion to coincide with the axis of the head portion. Extraoral suction arm.
A dental extraoral suction arm according to any one of claims 1 to 4;
a suction machine,
a ventilation pipe connecting the dental extraoral suction arm and the suction machine;
Equipped with
The dental extraoral suction arm has an internal ventilation path that opens to the suction port at one end and connects to the ventilation pipe at the other end,
A dental extraoral suction system that sucks air from the suction port by operating the suction machine.