CN215652398U

CN215652398U - Mouth-biting and temporomandibular joint training instrument

Info

Publication number: CN215652398U
Application number: CN202121736911.2U
Authority: CN
Inventors: 周雄; 杨屹巍
Original assignee: Suzhou Minimally Invasive Rehabilitation Medical Technology Group Co ltd
Current assignee: Suzhou Minimally Invasive Rehabilitation Medical Technology Group Co ltd
Priority date: 2021-07-27
Filing date: 2021-07-27
Publication date: 2022-01-28
Anticipated expiration: 2031-07-27

Abstract

The utility model provides a mouthpiece and temporomandibular joint training instrument, wherein the mouthpiece comprises an air bag body, and at least one vent hole is arranged on the air bag body; the air bag body can expand and contract along the first direction, and two surfaces of the air bag body arranged along the first direction are respectively used for contacting with upper teeth and lower teeth; a first groove used for being meshed and matched with the upper teeth is formed in the circumferential direction of one surface, which is used for being contacted with the upper teeth, of the air bag body; and/or a second groove used for being meshed and matched with the lower teeth is arranged on one surface of the air bag body, which is used for being contacted with the lower teeth, along the circumferential direction of the air bag body. Temporomandibular joint training apparatus includes the mouthpiece and the host computer of above. Because the mouthpiece adopts the gasbag structure, not only simple structure from this, processing is convenient, has lighter weight, simultaneously because the material of gasbag body is softer, can not cause the damage to patient's oral mucosa from this. In addition, through setting up first recess and/or second recess, can effectively prevent to take place to slide between patient's tooth and the mouthpiece, avoid the saliva to spill over.

Description

Mouth-biting and temporomandibular joint training instrument

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a mouth piece and temporomandibular joint training instrument.

Background

The temporomandibular joint dysfunction syndrome is one of clinical common diseases, is classified as the fourth oral epidemic disease affecting human health by WHO, is a syndrome of a series of symptoms such as temporomandibular joint area pain, reverberation, muscular soreness, hypodynamia, mouth opening limitation, temporomandibular joint dysfunction and the like, and has repeated attack, lingering and prolonged treatment in some cases, thereby seriously affecting masticatory muscles and language functions. From the perspective of modern medicine, the cause of the disease is complex and is not clear yet. It is thought to be related to emotional instability, physical weakness, disturbance of occlusion relationship of teeth, and trauma. These factors affect the normal structure of the mandibular joint or hinder the coordinated movement of muscles and ligaments attached around the joint structure.

Studies have shown that exercise is beneficial in treating disorders of the jaw joints. Movement is necessary to prevent cartilage deterioration, soft tissue delamination of the jaw joint surfaces. In many cases, movement can stimulate joint healing, reduce joint pain and swelling. By stretching and relaxing the jaw muscles, increased training is gradually helpful to improve the mouth-opening degree of a patient suffering from muscle pain. Passive motion may also improve the benefits of the treatment plan, especially subsequent training. Therefore, the passive jaw opening training has good effect on patients with jaw joint disorder or physical therapy of the jaw after operation.

Temporomandibular passive training apparatus of the prior art suffer from the following problems:

1. traditional temporomandibular passive training instruments are generally heavier, and the head and neck need to be kept in an immovable posture during treatment, so that the instrument needs to be held by hands of people, and muscle and cervical vertebra aches can be caused after long-term use no matter the instrument is assisted by medical care personnel or used by the patients.

2. Traditional temporomandibular passive training instrument needs manual regulation to open a mouthful distance, and the operation is adjusted loaded down with trivial details, and all belongs to static draft mode, and high load is at tensile in-process for a long time, causes patient's soft tissue injury easily.

3. When the traditional temporomandibular passive training instrument is used, the mouth opening condition is usually measured by gears, and no accurate mouth opening distance value exists.

4. The material of the mouthpiece part of the traditional temporomandibular passive training instrument is hard, the oral mucosa is easy to damage, and the traditional temporomandibular passive training instrument is not detachable, is not sanitary and is easy to cross-infect.

5. The replacement process of the mouthpiece part of the traditional temporomandibular passive training instrument is complicated, is not easy to disassemble and is not efficient.

6. The traditional temporomandibular passive training instrument is only used for assisting the limitation of treatment openings, cannot assist doctors in patient evaluation and diagnosis and personalized treatment schemes, and is not scientific enough.

It is noted that the information disclosed in this background section of the utility model is only for enhancement of understanding of the general background of the utility model, and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.

SUMMERY OF THE UTILITY MODEL

It is an object of the present invention to provide a mouthpiece and temporomandibular joint training apparatus that solves one or more of the above mentioned technical problems.

In order to achieve the aim, the utility model provides a mouthpiece which comprises an air bag body, wherein at least one vent hole is formed in the air bag body;

the air bag body can expand and contract along a first direction, and two surfaces of the air bag body arranged along the first direction are respectively used for contacting with upper teeth and lower teeth;

a first groove used for being meshed and matched with the upper teeth is formed in the circumferential direction of one surface, which is used for being in contact with the upper teeth, of the air bag body; and/or a second groove used for being meshed and matched with the lower teeth is arranged on one surface of the air bag body, which is used for being contacted with the lower teeth, along the circumferential direction of the air bag body.

Optionally, the first groove and/or the second groove are V-shaped grooves, circular arc-shaped grooves or rectangular grooves.

Optionally, a partial outer contour of a cross section of the airbag body along a second direction is arranged in a circular arc shape, and the second direction is perpendicular to the first direction.

Optionally, the airbag body is arranged in a U-shape along the cross section of the second direction.

Optionally, a reinforcement is arranged on the side wall of the airbag body, and the vent hole is arranged on the reinforcement.

Optionally, the vent hole is located at a central position on the side wall of the airbag body.

Optionally, the vent hole is recessed relative to the outer wall of the airbag body.

In order to achieve the above object, the present invention further provides a temporomandibular joint training apparatus, which includes a main machine and the mouthpiece mentioned above, wherein the mouthpiece is connected to the main machine through the vent hole, the main machine includes a housing and an inflation and exhaust device disposed inside the housing, the inflation and exhaust device is used for inflating gas into the airbag body so as to enable the airbag body to expand along a first direction, and discharging gas from the inside of the airbag body so as to enable the airbag body to contract along the first direction.

Optionally, a plug pipe matched with the vent hole is arranged on one side of the shell close to the vent hole, and the plug pipe is connected with the air charging and discharging device.

Optionally, the plug pipe includes a pipe body and a step portion arranged along the peripheral circumference of the pipe body, the vent hole includes a first hole cavity and a second hole cavity which are communicated with each other, the first hole cavity is close to the position of the outer side wall of the airbag body, the second hole cavity is close to the position of the inner side wall of the airbag body, the inner diameter of the first hole cavity is larger than the inner diameter of the second hole cavity, the inner diameter of the first hole cavity is matched with the outer diameter of the step portion, and the inner diameter of the second hole cavity is matched with the outer diameter of the pipe body.

Optionally, the plug pipe still includes elasticity joint spare, elasticity joint spare is located on the periphery of step portion, and follows the radially outside outstanding setting of step portion, be equipped with on the inner wall of first vestibule with elasticity joint spare matched with joint groove.

Optionally, the elastic clamping piece is an elastic ring pipe, the elastic clamping piece is arranged along the circumferential direction of the outer periphery of the step portion, and the clamping groove is an annular groove matched with the elastic clamping piece.

Optionally, the elastic clamping piece is provided with a notch.

Optionally, the breach is followed the circumference setting of elastic clamping spare just follows the circumference of elastic clamping spare is run through elastic clamping spare.

Optionally, the airbag body is provided with at least two vent holes, wherein at least one vent hole is used for inflation, at least one vent hole is used for exhaust, the vent hole defined for inflation is a first vent hole, the vent hole defined for exhaust is a second vent hole, the housing is provided with at least two plug pipes, the plug pipe defined for being matched with the first vent hole is a first plug pipe, and the plug pipe defined for being matched with the second vent hole is a second plug pipe.

Optionally, the inflation and exhaust device is an air pump, the air pump has two working modes of air pumping and air inflation, the air pump is provided with an air inlet and an air outlet, the air outlet of the air pump is connected with the first insertion pipe through a first air transmission pipeline, and the air inlet of the air pump is connected with the second insertion pipe through a second air transmission pipeline.

Optionally, a check valve is arranged on the first gas transmission pipeline; and/or

The second gas transmission pipeline comprises a vent pipe, an electromagnetic valve and a vent pipe, wherein the gas inlet end of the vent pipe is connected with the second plug pipe, the gas outlet end of the vent pipe is connected with the gas inlet of the electromagnetic valve, the gas inlet end of the vent pipe is connected with the gas outlet of the electromagnetic valve, and the gas outlet end of the vent pipe is connected with the gas inlet of the gas pump.

Optionally, a distance measuring device for measuring the mouth opening distance is arranged outside the shell.

Optionally, an arc-shaped inclined plane is arranged at one end, close to the upper teeth, of the shell, and the distance measuring device is arranged on the arc-shaped inclined plane.

Compared with the prior art, the mouth-piece and temporomandibular joint training instrument provided by the utility model has the following advantages: the mouthpiece provided by the utility model adopts the air bag structure, so that the structure is simple, the processing is convenient, the weight is lighter, the use is more convenient, meanwhile, the material of the air bag body is softer, the oral mucosa of a patient cannot be damaged, the muscles in the oral cavity of the patient can be fully unfolded in the treatment process, the muscle tension is effectively reduced, the pressure injury risk can be effectively reduced, and the problem of unbalanced pressure in the oral cavity is solved. In addition, the gasbag body is used for being equipped with along its circumference with the one side that the upper teeth contacted and is used for being the first recess that the interlock matches with the upper teeth, and/or the gasbag body is used for being equipped with along its circumference with the one side that the lower teeth contacted and is used for being the second recess that the interlock matches with the lower teeth, can effectively prevent to open a mouthful training in-process, and patient's tooth and the bite take place to slide between the mouth, and influence the training effect, also can avoid patient's saliva to spill over and lead to the cross infection risk simultaneously.

Drawings

FIG. 1 is a perspective view of a mouthpiece in a first embodiment of the present invention;

FIG. 2 is a schematic perspective view of another angle of the mouthpiece shown in FIG. 1;

FIG. 3 is a perspective view of a mouthpiece in a second embodiment of the present invention;

FIG. 4 is a side view of the mouthpiece shown in FIG. 3;

FIG. 5 is a perspective view of a mouthpiece in a third embodiment of the present invention;

FIG. 6 is a schematic view of the temporomandibular joint training apparatus in an original state of the mouthpiece according to one embodiment of the present invention;

FIG. 7 is a schematic view of the temporomandibular joint training apparatus in one embodiment of the present invention, shown in its overall configuration with the mouthpiece in an expanded state;

FIG. 8 is a top view of a main frame of the temporomandibular joint training apparatus in an embodiment of the present invention;

FIG. 9 is a schematic view of the connection between the vent hole and the insertion tube according to an embodiment of the present invention;

fig. 10 is an exploded view of the temporomandibular joint training apparatus in accordance with an embodiment of the present invention.

Wherein the reference numbers are as follows:

an airbag body-100; a vent-110; a first bore-111; a second bore-112; a clamping groove-113; a first groove-120; a second recess-130; a reinforcement-140; a first vent-110A; a second vent-110B;

a host-200; a housing-210; a plug tube-220; a tube body-221; a step-222; an elastic clamping piece-223; gap-224; a first bayonet tube-220A; a second bayonet tube-220B; an arc inclined plane-201; a first housing cover-211; a second housing cover-212;

an air pump-1; an air inlet-11; outlet-12; vent-13; a control panel-2; a first gas transmission pipeline-3; a one-way valve-31; a second gas transmission pipeline-4; a breather pipe-41; a solenoid valve-42; an exhaust pipe-43; a pressure sensor-5; a distance measuring device-6; a wireless communication module-7; a battery-8; wires-9A, 9B, 9C, 9D, 9E; switch-10;

a first direction-D1;

a second direction-D2.

Detailed Description

The mouthpiece and temporomandibular joint training apparatus of the present invention will now be described in further detail with reference to the accompanying figures 1 to 10 and the detailed description of the utility model. The advantages and features of the present invention will become more apparent from the following description. It is to be noted that the drawings are in a very simplified form and are all used in a non-precise scale for the purpose of facilitating and distinctly aiding in the description of the embodiments of the present invention. To make the objects, features and advantages of the present invention comprehensible, reference is made to the accompanying drawings. It should be understood that the structures, proportions, sizes, and other elements shown in the drawings and described herein are illustrative only and are not intended to limit the scope of the utility model, which is to be given the full breadth of the appended claims and any and all modifications, equivalents, and alternatives to those skilled in the art should be construed as falling within the spirit and scope of the utility model. Specific design features of the utility model disclosed herein, including, for example, specific dimensions, orientations, locations, and configurations, will be determined in part by the particular intended application and use environment. In the embodiments described below, the same reference numerals are used in common between different drawings to denote the same portions or portions having the same functions, and a repetitive description thereof will be omitted. In this specification, like reference numerals and letters are used to designate like items, and therefore, once an item is defined in one drawing, further discussion thereof is not required in subsequent drawings. Additionally, if the method described herein comprises a series of steps, the order in which these steps are presented herein is not necessarily the only order in which these steps may be performed, and some of the described steps may be omitted and/or some other steps not described herein may be added to the method.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. The singular forms "a", "an" and "the" include plural referents, the term "or" is generally employed in its sense including "and/or" the plural referents, "the plural referents are generally employed in its sense including" at least one ", the plural referents are generally employed in its sense including" two or more ", and the terms" first "," second "and" third "are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of indicated technical features.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The utility model provides a mouth piece and temporomandibular joint training instrument, which aims to solve the problems that the existing temporomandibular joint training instrument is generally heavier, the mouth piece is made of harder material and the like. It should be noted that, as will be understood by those skilled in the art, the first direction D1 is referred to herein as a direction parallel to the patient's mouth opening direction, and the second direction D2 is referred to as a direction perpendicular to the patient's mouth opening direction.

To achieve the above idea, the present invention provides a mouthpiece, please refer to fig. 1 and fig. 2, wherein fig. 1 schematically shows a perspective structure of the mouthpiece provided by the first embodiment of the present invention; figure 2 schematically illustrates another angled perspective view of the mouthpiece shown in figure 1. As shown in fig. 1 and 2, the mouthpiece includes a balloon body 100, the balloon body 100 is provided with at least one vent hole 110, the balloon body 100 is expandable and contractible in a first direction D1, and both surfaces of the balloon body 100 disposed in the first direction D1 are respectively configured to contact upper teeth and lower teeth. The mouthpiece provided by the utility model adopts an air bag structure, so that the structure is simple, the processing is convenient, and the mouthpiece has lighter weight and is more convenient to use. In addition because the material of gasbag body 100 is softer, can not cause the damage to patient's oral mucosa from this, in the training process, can make patient's the inside muscle of oral cavity obtain comprehensive stretching, effectively reduce muscular tension, can effectively reduce simultaneously and press the wound risk, improve the unbalanced problem of the inside pressurized in oral cavity. Specifically, when gas is filled into the airbag body 100 positioned in the mouth of the patient, the airbag body 100 can be expanded along the first direction D1, the expanded airbag body 100 can expand the mouth of the patient, the more the gas filled into the airbag body 100, the larger the expansion degree of the airbag body 100 is, the larger the opening distance of the patient is, after the mouth of the patient cannot be further expanded, the inflation into the airbag body 100 is stopped, and after the training is completed to the target time, the gas in the airbag body 100 is slowly discharged, so that the mouth of the patient is slowly closed, and one opening training is completed.

Preferably, the material of the air bag body 100 is a soft polymer material, such as TPU (thermoplastic polyurethane elastomer rubber), so that the mouthpiece provided by the present invention can better conform to the mouth shape of the patient by using the soft polymer material to make the air bag body 100, and the damage to the oral mucosa can be further reduced.

As shown in fig. 1 and 2, in the present embodiment, the airbag body 100 is provided with two vent holes 110, one vent hole 110 being used to inflate the inside of the airbag body 100, and the other vent hole 110 being used to exhaust the gas inside the airbag body 100. For the sake of convenience of distinction, the vent hole 110 for inflation is hereinafter defined as a first vent hole 110A, and the vent hole 110 for exhaust is hereinafter defined as a second vent hole 110B. As will be understood by those skilled in the art, in other embodiments, only one vent hole 110 may be provided in the airbag body 100, and in this case, the inside of the airbag body 100 may be inflated through the vent hole 110, or the inside of the airbag body 100 may be exhausted through the vent hole 110. Of course, in other embodiments, three or more vent holes 110 may be provided in the airbag body 100, wherein at least one vent hole 110 is used for inflation and the other vent holes 100 are used for deflation.

Preferably, as shown in fig. 2, the vent hole 110 is located at a central position on the outer sidewall of the airbag body 100. Therefore, the vent holes 110 are arranged at the central position on the outer side wall of the airbag body 100, so that the uniformity of inflation and deflation can be ensured, and the pressure inside the oral cavity is more balanced in the process of mouth opening training of a patient.

Further, as shown in fig. 2, a reinforcement 140 is disposed on a sidewall of the airbag body 100, and the vent hole 110 is disposed on the reinforcement 140 and extends into the airbag body 100. Thus, by providing the vent hole 110 in the reinforcement member 140, it is possible to ensure that the shape of the vent hole 110 does not change when the airbag body 100 expands and contracts in the first direction D1, thereby ensuring airtightness of the mouthpiece during use. It should be noted that, as will be understood by those skilled in the art, the stiffness of the reinforcement member 140 is greater than that of the airbag body 100, and the shape of the reinforcement member 140 is not changed when the airbag body 100 expands and contracts in the first direction D1.

Preferably, the vent hole 110 is recessed with respect to the outer wall of the airbag body 100. Because the vent hole 110 is recessed inward relative to the outer wall of the airbag body 100, the leakage of the inflated gas can be effectively prevented, and meanwhile, the vent hole 110 and the insertion tube 220 described below can be connected more tightly, so that the problem of easy sliding of radial positioning is effectively solved.

As shown in fig. 1 and 2, in the present embodiment, a surface of the airbag body 100 contacting the upper teeth is provided with a first groove 120 along a circumferential direction thereof for engaging with the upper teeth, and a surface of the airbag body 100 contacting the lower teeth is provided with a second groove 130 along a circumferential direction thereof for engaging with the lower teeth. Therefore, the first groove 120 is formed in the face, contacting with the upper teeth, of the air bag body 100, the second groove 130 is formed in the face, contacting with the lower teeth, of the air bag body 100, when the mouthpiece is placed in the mouth of a patient, the upper teeth of the patient can be occluded in the first groove 120, the lower teeth of the patient can be occluded in the second groove 130, when mouth opening training is conducted, the upper teeth of the patient are occluded in the first groove 120, and the lower teeth of the patient are occluded in the second groove 130, so that the situation that in the mouth opening training process, the teeth of the patient slide with the mouthpiece to affect the training effect can be effectively prevented, and meanwhile, the risk of cross infection caused by saliva overflow of the patient can be avoided. In addition, through setting up first recess 120 and second recess 130 also can make the patient when carrying out the training, need not keep an unmovable posture, effectively reduce the muscle that the patient produced and cervical vertebra ache and feel in the training process. In other embodiments, the first recess 120 may be provided only on one surface of the airbag body 100 for contacting with the upper teeth, or the second recess 130 may be provided only on one surface of the airbag body 100 for contacting with the lower teeth, which is not limited in the present invention.

Further, as shown in fig. 1 and 2, in the present embodiment, the first groove 120 and the second groove 130 are both arc-shaped grooves. Therefore, the first groove 120 and the second groove 130 are both provided with the arc-shaped grooves, so that the first groove 120 and the second groove 130 are more smooth, and the upper teeth of the patient can be more conveniently occluded in the first groove 120 and the lower teeth of the patient can be more conveniently occluded in the second groove 130. It should be noted that, as will be understood by those skilled in the art, in other embodiments, the shapes of the first groove 120 and the second groove 130 may be different, that is, one of the first groove 120 and the second groove 130 is a circular arc groove, and the other is a groove with another shape, which is not limited in the present invention.

Preferably, as shown in fig. 1 and 2, a part of the outer contour of a cross section (i.e., a radial cross section) of the airbag body 100 along a second direction D2 is configured in a circular arc shape, and the second direction D2 is perpendicular to the first direction D1. Because the partial outer contour of the section of the airbag body 100 along the second direction D2 is arranged in a circular arc shape, the mouthpiece provided by the utility model can be more close to the mouth shape of a patient.

Further, as shown in fig. 1 and 2, the airbag body 100 is disposed in a U-shape in cross section along the second direction D2. Because the cross section of the airbag body 100 along the second direction D2 is U-shaped, the mouthpiece provided by the utility model can be more conformable to the mouth shape of the patient, and the overall structure of the mouthpiece provided by the utility model can be further simplified, thereby reducing the production cost of the mouthpiece.

Continuing to refer to fig. 3 and 4, wherein fig. 3 schematically illustrates a perspective view of a mouthpiece provided by a second embodiment of the present invention; figure 4 schematically illustrates a side view of the mouthpiece shown in figure 3. As shown in fig. 3 and 4, the mouthpiece provided in the present embodiment is different from the mouthpiece provided in the first embodiment in that, in the present embodiment, the first groove 120 and the second groove 130 are both V-shaped grooves. Therefore, the first groove 120 and the second groove 130 are both set to be V-shaped grooves, which not only can facilitate the processing of the first groove 120 and the second groove 130, but also can enable the upper teeth of the patient to be tightly occluded in the first groove 120, and the lower teeth of the patient to be tightly occluded in the second groove 130, so as to further prevent the teeth and the mouthpiece of the patient from sliding. It should be noted that, as will be understood by those skilled in the art, in other embodiments, the shapes of the first groove 120 and the second groove 130 may also be different, that is, one of the first groove 120 and the second groove 130 is a V-shaped groove, and the other is a groove with another shape, which is not limited in the present invention.

Continuing to refer to fig. 5, a perspective view of a mouthpiece provided by a third embodiment of the present invention is schematically shown. As shown in fig. 5, the present embodiment provides a mouthpiece that differs from the mouthpiece provided by the first embodiment in that, in the present embodiment, both the first recess 120 and the second recess 130 are rectangular grooves. Therefore, the first groove 120 and the second groove 130 are both rectangular grooves, so that the first groove 120 and the second groove 130 can be processed more conveniently, and the rectangular first groove 120 and the rectangular second groove 130 can contain more saliva, so that the saliva of a patient can be further prevented from overflowing in the process of mouth opening training, and the risk of cross infection is effectively reduced. It should be noted that, as will be understood by those skilled in the art, in other embodiments, the shapes of the first groove 120 and the second groove 130 may be different, that is, one of the first groove 120 and the second groove 130 is a rectangular groove, and the other is a groove with another shape, which is not limited in the present invention.

As will be understood by those skilled in the art, in other embodiments, the first groove 120 and the second groove 130 may have other shapes besides V-shaped grooves, circular arc-shaped grooves or rectangular grooves, which is not limited by the present invention.

To achieve the above idea, the present invention further provides a temporomandibular joint training apparatus, please refer to fig. 6 and 7, wherein fig. 6 schematically shows a schematic view of the temporomandibular joint training apparatus provided by an embodiment of the present invention in an original state (non-inflated state) of the mouthpiece; figure 7 shows schematically the temporomandibular joint training apparatus shown in figure 6 with the mouthpiece in an expanded state (inflated state). As shown in fig. 6 and 7, the temporomandibular joint training apparatus includes a main unit 200 and a mouthpiece as described above, the mouthpiece is connected to the main unit 200 through the vent 110, the main unit 200 includes a housing 210 and an inflation and deflation device provided inside the housing 210, the inflation and deflation device is used for inflating gas into the airbag body 100 so as to enable the airbag body 100 to expand in a first direction D1 and discharging gas from the inside of the airbag body 100 so as to enable the airbag body 100 to contract in a first direction D1. Therefore, the temporomandibular joint training instrument provided by the utility model comprises the mouthpiece, so that the temporomandibular joint training instrument provided by the utility model is light in overall weight, and can effectively solve the problems that the device in the prior art adopts pure mechanical stiff drafting in the training process to cause pain of a patient, and the oral mucosa of the patient is easy to be injured and the risk of masseter muscle injury is easy to generate. In addition, the temporomandibular joint training instrument provided by the utility model has a simple and small structure, does not need to be supported by hands, and can effectively eliminate the risks of muscle stiffness and cervical vertebra ache of a patient caused by limited physical movement of the patient in the process of mouth opening training.

Referring to fig. 8, a top view of a main frame 200 of the temporomandibular joint training apparatus according to an embodiment of the present invention is schematically shown. As shown in fig. 8, an insertion pipe 220 matched with the vent hole 110 is disposed on one side of the housing 210 close to the vent hole 110, and the insertion pipe 220 is connected to the air charging and discharging device. Therefore, the detachable connection between the host 200 and the mouthpiece can be realized through the insertion pipe 220 and the vent 110 which are matched with each other, so that the quick replacement of the mouthpiece part can be realized, the cross infection among patients can be effectively avoided, and the use cost can be effectively reduced. It should be noted that, as can be understood by those skilled in the art, the insertion tubes 220 are disposed in one-to-one correspondence with the ventilation holes 110, that is, the number of the insertion tubes 220 is the same as that of the ventilation holes 110.

Specifically, as shown in fig. 8, when the airbag body 100 is provided with a first vent hole 110A for inflation and a second vent hole 110B for deflation, two insertion pipes 220 are correspondingly provided on the housing 210 of the host 200, the insertion pipe 220 for matching with the first vent hole 110A is defined as a first insertion pipe 220A, and the insertion pipe 220 for matching with the second vent hole 110B is defined as a second insertion pipe 220B. Thus, through the first plug tube 220A and the first vent hole 110A, which are engaged with each other, the main unit 200 can inflate the inside of the airbag body 100, so that the airbag body 100 can expand in the first direction D1; through the second insertion pipe 220B and the second vent hole 110B, which are engaged with each other, the main unit 200 can discharge the gas inside the airbag body 100, so that the airbag can be contracted in the second direction D2. In addition, through the first plug pipe 220A and the first vent hole 110A which are matched with each other and the second plug pipe 220B and the second vent hole 110B which are matched with each other, the connection between the mouthpiece and the main machine 200 can be firmer, and the problem of easy sliding of radial positioning is effectively avoided.

With continued reference to fig. 8 and fig. 9, fig. 9 schematically illustrates a connection relationship between the vent 110 and the insertion tube 220 according to an embodiment of the present invention. As shown in fig. 8 and 9, the plug tube 220 includes a tube body 221 and a step portion 222 circumferentially disposed along an outer periphery of the tube body 221, the vent hole 110 includes a first bore 111 and a second bore 112 that are communicated with each other, the first bore 111 is located near an outer side wall of the airbag body 100, the second bore 112 is located near an inner side wall of the airbag body 100, an inner diameter of the first bore 111 is larger than an inner diameter of the second bore 112, the inner diameter of the first bore 111 matches an outer diameter of the step portion 222, and the inner diameter of the second bore 112 matches an outer diameter of the tube body 221. Therefore, when the plug tube 220 is inserted into the correspondingly arranged vent hole 110, the step portion 222 on the plug tube 220 can play a role in sealing the second hole cavity 112, so that the air tightness of the airbag body 100 can be improved, and the training effect is prevented from being influenced by air leakage of the airbag body 100 in the process of opening training.

Preferably, as shown in fig. 8 and 9, the insertion tube 220 further includes an elastic clamping member 223, the elastic clamping member 223 is disposed on the outer periphery of the step portion 222 and protrudes outward in the radial direction of the step portion 222, and a clamping groove 113 matched with the elastic clamping member 223 is disposed on the inner wall of the first bore 111. Therefore, when the plug tube 220 is inserted into the vent hole 110, the elastic clamping piece 223 is pressed to deform, the elastic clamping piece 223 can be smoothly clamped into the clamping groove 113, after the elastic clamping piece 223 is clamped into the clamping groove 113, external force is eliminated, and the elastic clamping piece 223 returns to the initial shape, so that the plug tube 220 can be firmly locked in the vent hole 110, and the mouthpiece and the host machine 200 can be firmly fixed together. When the inserting tube 220 is pulled outwards, the elastic clamping piece 223 is extruded and deformed again, after the pulling force breaks through the critical condition, the elastic clamping piece 223 can be smoothly separated from the clamping groove 113, and the inserting tube 220 can be smoothly pulled out from the vent hole 110 at the moment so as to separate the mouthpiece from the host 200. It can be seen that, through the elastic clamping member 223 and the clamping groove 113 which are mutually matched, not only can the quick connection between the mouthpiece and the main machine 200 be realized, but also the replacement of the mouthpiece can be more stable and efficient.

The elastic clamping member 223 is an elastic ring pipe, the elastic clamping member 223 is arranged along the circumferential direction of the outer periphery of the step portion 222, and the clamping groove 113 is an annular groove matched with the elastic clamping member 223. Therefore, the elastic clamping piece 223 is arranged to be an elastic ring pipe, the clamping groove 113 is arranged to be an annular groove, the requirement of limitation in the vertical direction between the vent hole 110 and the inserting pipe 220 does not exist, the inserting pipe 220 can be inserted into the vent hole 110 more conveniently and efficiently, and the stability and the efficiency in the mouthpiece replacing process are further ensured. It should be noted that, as will be understood by those skilled in the art, the elastic clamping member 223 may also be other structures besides the elastic ring tube, for example, the elastic clamping member 223 may be an elastic clamping bead, which is not limited by the present invention.

Specifically, in order to facilitate the installation of the elastic clamping member 223, the step portion 222 is provided with an installation groove (not shown in the figure) matched with the elastic clamping member 223 along the circumferential direction thereof. Therefore, the elastic clamping piece 223 can be embedded into the mounting groove, so that the elastic clamping piece 223 can be mounted.

As shown in fig. 9, the elastic clip member 223 is provided with a notch 224. From this, through set up breach 224 on the elasticity joint spare 223, can be more convenient for elasticity joint spare 223 takes place to warp when receiving outside extrusion, so that will peg graft pipe 220 inserts when in the air vent 110, elasticity joint spare 223 can be gone into smoothly the card in the annular groove, and draw outward when pegging graft pipe 220, elasticity joint spare 223 can break away from smoothly the annular groove.

Preferably, the gap 224 is arranged along the circumference of the elastic clamping piece 223 and runs through the circumference of the elastic clamping piece 223, that is, the radial cross section of the elastic clamping piece 223 is arranged in a C shape. From this, the processing manufacturing of elastic clamping piece 223 can be convenient for more in this kind of setting, can make elastic clamping piece 223 when receiving outside extrusion simultaneously, warp more evenly.

Please refer to fig. 10, which schematically illustrates an exploded view of the temporomandibular joint training apparatus according to an embodiment of the present invention. As shown in fig. 10, the inflation and exhaust device includes an air pump 1, the air pump 1 has two working modes of air pumping and air inflation, the air pump 1 is provided with an air inlet 11, an air outlet 12 and an air vent 13, the air outlet 12 of the air pump 1 is connected with the first insertion pipe 220A through a first air transmission pipeline 3, and the air inlet 11 of the air pump 1 is connected with the second insertion pipe 220B through a second air transmission pipeline 4. Because the utility model adopts the same air pump for air inflation and air exhaust, the utility model not only can reduce the number of parts and reduce the cost, but also can simplify the integral structure of the main machine and further reduce the weight of the temporomandibular joint training instrument. It should be noted that, as will be appreciated by those skilled in the art, in other embodiments, the inflation and deflation device may comprise two air pumps, one for inflation and one for deflation.

Preferably, in order to reduce the cost, the housing 210 of the main unit 200 is not completely closed, so that the inside of the housing 210 is communicated with the outside atmosphere, and thus, when the air pump 1 is in the inflation mode, the outside air can enter the air pump 1 through the vent hole 13, and the air pump 1 inflates the sucked air inside the airbag body 100 through the first air transmission pipeline 3 and the first insertion pipe 220A. When the air pump 1 is in the air pumping mode, air inside the airbag body 100 can be sucked into the air pump 1 through the second inserting pipe 220B and the second air transmission pipeline 4, and is finally discharged through the vent 13 on the air pump 1.

Preferably, as shown in fig. 10, the first air transmission pipeline 3 is provided with a one-way valve 31. Specifically, when the air pump 1 is in the inflation mode, the check valve 31 is in the open state, so that the air delivered to the check valve 31 by the first air delivery pipeline 3 can only be ensured to flow in and out, and therefore, the air inflated into the airbag body 100 can be prevented from flowing back into the air pump 1 through the check valve 31, and the normal operation of the temporomandibular joint training apparatus can be prevented from being affected. When pressure reduction or pressure maintaining is needed, namely the air pump 1 is in an air suction mode or a shutdown state, the one-way valve 31 is in a closed state, so that the phenomenon that the redundant air in the first air transmission pipeline 3 enters the air bag again to influence the normal operation of the temporomandibular joint training instrument can be avoided.

Preferably, as shown in fig. 10, a control board 2 is further disposed inside the housing 210, and the air pump 1 is connected to the control board 2 through a wire 9A. Therefore, when gas needs to be filled into the airbag body 100, under the control of the control panel 2, the air pump 1 is in an inflation mode, and the gas sucked into the air pump 1 through the vent 13 can be conveyed to the first air transmission pipeline 3 through the air outlet 12 of the air pump 1, conveyed to the first insertion pipe 220A through the first air transmission pipeline 3, and finally filled into the airbag body 100 through the first insertion pipe 220A, so that the airbag body 100 is expanded along the first direction D1. When pressure maintaining is needed, the air pump 1 is in a shutdown state under the control of the control board 2. When the gas in the airbag body 100 needs to be discharged, the air pump 1 is in an air exhaust mode under the control of the control panel 2, and the gas in the airbag body 100 can be conveyed to the second air transmission pipeline 4 through the second inserting pipe 220B, conveyed to the air pump 1 through the second air transmission pipeline 4, and finally discharged through the vent 13 on the air pump 1.

Further, as shown in fig. 10, the second air transmission pipeline 4 includes an air pipe 41, an electromagnetic valve 42 and an air exhaust pipe 43, the electromagnetic valve 42 is connected with the control panel 2 through a wire 9B, an air inlet end of the air pipe 41 is connected with the second inserting pipe 220B, an air outlet end of the air pipe 41 is connected with the air inlet 11 of the electromagnetic valve 42, an air inlet end of the air pipe 43 is connected with the air outlet 12 of the electromagnetic valve 42, and an air outlet end of the air pipe 43 is connected with the air inlet 11 of the air pump 1. Because the second inserting pipe 220B is always in a communicating state with the vent pipe 41, in order to prevent the gas filled into the airbag body 100 from flowing back into the air pump 1 through the vent pipe 41 in the inflating process, when the air pump 1 is in an inflating mode, the electromagnetic valve 42 is in a normally closed state under the control of the control panel 2. When pressure reduction is needed, under the control of the control panel 2, the air pump 1 is switched to an air suction mode, the electromagnetic valve 42 is in an open state, and air inside the airbag body 100 can reach the electromagnetic valve 42 through the vent pipe 41, and then is conveyed to the exhaust pipe 43 through the electromagnetic valve 42, and finally is discharged through the vent hole 13 on the air pump 1.

Preferably, as shown in fig. 10, a pressure sensor 5 is further disposed inside the housing 210, and the pressure sensor 5 is connected to the control board 2 through a wire 9C. Therefore, the pressure sensor 5 can monitor the pressure inside the airbag body 100 in real time and send the monitored pressure value to the control board 2, so as to further improve the safety of the temporomandibular joint training instrument provided by the utility model in the using process. Specifically, when the pressure sensor 5 monitors that the pressure inside the airbag body 100 reaches a target pressure, the air pump 1 stops continuously inflating air into the airbag body 100 under the control of the control board 2; when the pressure sensor 5 monitors that the pressure inside the airbag body 100 is too high and needs to be reduced, the air pump 1 is switched to an air-bleeding mode under the control of the control board 2, and the pressure inside the airbag body 100 is reduced by exhausting the gas inside the airbag body 100.

Preferably, as shown in fig. 10, a distance measuring device 6 for measuring the mouth opening distance is provided outside the housing 210, and the distance measuring device 6 is connected to the control board 2 through a wire 9D. Therefore, the mouth opening distance of the patient in the mouth opening training process can be monitored in real time through the distance measuring device 6, and the monitored mouth opening distance is sent to the control board 2, so that the mouth opening distance is accurately controlled under the control of the control board 2, and the mouth opening training effect is further improved. Specifically, when the patient's mouth opening distance reaches the target distance, the air pump 1 stops continuing to inflate the air into the airbag body 100 under the control of the control board 2.

Preferably, as shown in fig. 6 and 7, an arc inclined surface 201 is provided at one end of the housing 210 of the main body 200 close to the upper teeth, and the distance measuring device 6 is provided on the arc inclined surface 201. Therefore, the arc-shaped inclined surface 201 is arranged at one end of the shell 210 of the main machine 200 close to the upper teeth, and the distance measuring device 6 is arranged on the arc-shaped inclined surface 201, so that the measuring angle of the distance measuring device 6 can be wider. Specifically, as shown in fig. 10, the height of the arc-shaped inclined plane 201 close to the bite side is lower than the height of the arc-shaped inclined plane 201 away from the bite side, and the distance measuring device 6 is located on the lower side of the arc-shaped inclined plane 201, that is, the distance measuring device 6 is located close to the bite. It should be noted that, as will be understood by those skilled in the art, the distance measuring device 6 may be a device for measuring distance in the prior art, such as a laser probe, and the present invention is not limited thereto.

Preferably, as shown in fig. 10, a wireless communication module 7 is further disposed inside the housing 210, and the wireless communication module 7 is connected to the control board 2. Therefore, by arranging the wireless communication module 7 in the shell 210, data information such as pressure, mouth opening distance and the like collected in the mouth opening training process can be sent to external electronic equipment, such as a mobile phone, a personal computer, a tablet personal computer and the like, so as to perform data analysis, and a good foundation is laid for forming a training scheme for the individual patient. It should be noted that, as will be understood by those skilled in the art, the wireless communication module 7 may employ a wireless communication element in the prior art, such as bluetooth, for example, and the utility model is not limited thereto.

Preferably, as shown in fig. 10, a battery 8 is further disposed inside the housing 210, and the battery 8 is connected to the control board 2 through a wire 9E. Therefore, the battery 8 can provide electric energy for the air pump 1, the pressure sensor 5, the distance measuring device 6, the wireless communication module 7, the control panel 2 and the like, so that the temporomandibular joint training instrument provided by the utility model does not need an external power supply in the use process, and is more convenient to use.

Further, as shown in fig. 6, 7 and 10, the housing 210 of the host 200 is formed by combining a first housing cover 211 and a second housing cover 212, the first housing cover 211 is covered on the second housing cover 212, the first housing cover 211 and the second housing cover 212 form an accommodating space, the air pump 1, the control board 2, the pressure sensor 5 and the battery 8 are all arranged in the accommodating space, the distance measuring device 6 is arranged on the first housing cover 211, and a switch 10 is arranged on a side surface of the first housing cover 211. In order to further reduce the overall weight of the temporomandibular joint training apparatus provided by the present invention, the first cover 211 and the second cover 212 are made of plastic, preferably PP (polypropylene), so that the main body 200 is safer and lighter by making the first cover 211 and the second cover 212 from PP plastic, the overall weight of the temporomandibular joint training apparatus provided by the present invention is further reduced, the weight reduction is achieved, the problem that the training apparatus needs to be held by a hand due to heavy weight is effectively solved, and the risks of muscle stiffness and cervical vertebra aching pain caused by the limited physical activity of the patient during the mouth opening training are further eliminated.

The working principle of the temporomandibular joint training instrument provided by the present invention is explained below:

opening switch 10 on host 200, wireless communication module 7 in host 200 opens, establish connection through wireless signal and patient's cell-phone, install relevant APP in advance on patient's the cell-phone, the patient registers and establishes patient health information archives through this APP, through doctor's initial diagnosis, set up the safe training scheme (including target distance, target pressure and target training time) and input the safe training scheme that sets up in the APP, then let the patient bite the mouth, air pump 1 in host 200 starts the mode of aerifing to aerify to the inside of gasbag body 100, gasbag body 100 expands along first direction D1 gradually, so that the patient slowly opens the mouth, after patient's mouth opened to target distance, or the inside pressure of gasbag body 100 rises to the target pressure, air pump 1 stops to aerify gasbag body 100, so that the mouth opening distance of the patient is kept near the target distance, after the target training time is reached, the air pump 1 in the main machine 200 is switched to the air pumping mode to exhaust the air in the airbag body 100, and the airbag body 100 gradually contracts to the original state along the first direction D1, so that the mouth of the patient is slowly closed, and one mouth opening training is completed. The real-time mouth-opening distance and the real-time pressure of the temporomandibular joint training instrument provided by the utility model in the training process can be displayed in real time in a curve form at the mobile phone end, so that a doctor can more deeply know the illness state of a patient according to the curve graphs of the mouth-opening distance and the pressure change value in the training process to form a personal training scheme for the patient, and relevant data information in the training process can be stored in a network cloud end through an APP on the mobile phone, so that the doctor can conveniently check the historical illness state record of the patient at any time.

In conclusion, compared with the prior art, the mouth-biting and temporomandibular joint training instrument provided by the utility model has the following advantages: the mouthpiece provided by the utility model adopts the air bag structure, so that the structure is simple, the processing is convenient, the weight is lighter, the use is more convenient, meanwhile, the material of the air bag body is softer, the oral mucosa of a patient cannot be damaged, the muscles in the oral cavity of the patient can be fully unfolded in the treatment process, the muscle tension is effectively reduced, the pressure injury risk can be effectively reduced, and the problem of unbalanced pressure in the oral cavity is solved. In addition, the gasbag body is used for being equipped with along its circumference with the one side that the upper teeth contacted and is used for being the first recess that the interlock matches with the upper teeth, and/or the gasbag body is used for being equipped with along its circumference with the one side that the lower teeth contacted and is used for being the second recess that the interlock matches with the lower teeth, can effectively prevent to open a mouthful training in-process, and patient's tooth and the bite take place to slide between the mouth, and influence the training effect, also can avoid patient's saliva to spill over and lead to the cross infection risk simultaneously.

Furthermore, in the description of the present specification, reference to the description of the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the various embodiments or examples and features of the various embodiments or examples described in this specification can be combined and combined by those skilled in the art without contradiction.

The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the present invention. It will be apparent to those skilled in the art that various changes and modifications may be made in the utility model without departing from the spirit and scope of the utility model. Thus, it is intended that the present invention also include such modifications and variations as come within the scope of the utility model and their equivalents.

Claims

1. A mouthpiece is characterized by comprising an air bag body, wherein at least one vent hole is arranged on the air bag body;

2. A mouthpiece as claimed in claim 1, in which the first recess and/or the second recess is a V-shaped groove, a circular arc groove or a rectangular groove.

3. A mouthpiece as claimed in claim 1, in which part of the outer profile of a cross-section of the bladder body in a second direction is circular arc-shaped, the second direction being perpendicular to the first direction.

4. A mouthpiece as claimed in claim 3, in which the balloon body is provided with a U-shaped cross-section in the second direction.

5. A mouthpiece as claimed in claim 1, in which a reinforcement member is provided on a side wall of the air bag body, and the vent hole is provided on the reinforcement member.

6. A mouthpiece as claimed in claim 1, in which the vent hole is located centrally on the side wall of the bladder body.

7. A mouthpiece as claimed in claim 1, in which the vent holes are provided recessed inwardly relative to the outer wall of the bladder body.

8. A temporomandibular joint training apparatus comprising a main machine and a mouthpiece as claimed in any one of claims 1 to 7, the mouthpiece being connected to the main machine through the vent, the main machine including a housing and an inflation and deflation means provided inside the housing, the inflation and deflation means being adapted to inflate and deflate the interior of the bladder body so as to enable the bladder body to expand in a first direction and deflate the interior of the bladder body so as to enable the bladder body to contract in the first direction.

9. The temporomandibular joint training apparatus of claim 8, wherein a side of the housing proximate the vent is provided with a plug tube that mates with the vent, the plug tube being connected to the inflation and deflation device.

10. The temporomandibular joint training instrument of claim 9, wherein the insertion tube includes a tube body and a step portion circumferentially disposed along an outer periphery of the tube body, the vent includes a first bore and a second bore that are in communication with each other, the first bore being located near an outer sidewall of the airbag body, the second bore being located near an inner sidewall of the airbag body, an inner diameter of the first bore being larger than an inner diameter of the second bore, the inner diameter of the first bore matching an outer diameter of the step portion, the inner diameter of the second bore matching an outer diameter of the tube body.

11. The temporomandibular joint training instrument of claim 10, wherein the insertion tube further includes an elastic clamping member, the elastic clamping member is disposed on the outer periphery of the stepped portion and protrudes outward in the radial direction of the stepped portion, and a clamping groove matched with the elastic clamping member is disposed on the inner wall of the first bore.

12. The temporomandibular joint training apparatus of claim 11, wherein the elastic clip member is an elastic ring tube, the elastic clip member is circumferentially disposed along an outer circumference of the step portion, and the clip groove is an annular groove that mates with the elastic clip member.

13. The temporomandibular joint training apparatus of claim 12, wherein the resilient clip member is provided with a notch.

14. The temporomandibular joint training apparatus of claim 13, wherein the notch is disposed along a circumference of the resilient clip and extends through the resilient clip along the circumference of the resilient clip.

15. The temporomandibular joint training apparatus of claim 9, wherein the airbag body is provided with at least two vent holes, at least one of which is for inflation, at least one of which is for venting, the vent hole defined for inflation is a first vent hole, the vent hole defined for venting is a second vent hole, the housing is provided with at least two insertion tubes, the insertion tube defined for mating with the first vent hole is a first insertion tube, and the insertion tube defined for mating with the second vent hole is a second insertion tube.

16. The temporomandibular joint training instrument of claim 15, wherein the inflation and exhaust device is an air pump, the air pump has two modes of pumping and inflating, the air pump is provided with an air inlet and an air outlet, the air outlet of the air pump is connected with the first insertion tube through a first air transmission pipeline, and the air inlet of the air pump is connected with the second insertion tube through a second air transmission pipeline.

17. The temporomandibular joint training apparatus of claim 16, wherein a one-way valve is provided on the first air delivery line; and/or

18. The temporomandibular joint training apparatus of claim 8, wherein a distance measuring device is provided on the exterior of the housing for measuring the distance of the stoma.

19. The temporomandibular joint training apparatus of claim 18, wherein an arcuate ramp is provided on an end of the housing proximate the upper teeth, and the distance measuring device is provided on the arcuate ramp.