Mouth opening device for temporal-mandibular joint nuclear magnetic resonance examination

Abstract

The utility model discloses a mouth opening device for nuclear magnetic resonance examination of temporomandibular joints, and relates to the technical field of medical instruments, the mouth opening device for nuclear magnetic resonance examination of temporomandibular joints comprises a fixing assembly, the fixing assembly comprises an upper support plate and a lower support plate, and the upper support plate and the lower support plate are used for opening an oral cavity; the occlusion groove is used for accommodating teeth; the mouth opening limiting assembly is arranged in the occlusion groove, the mouth opening limiting assembly comprises a rear fixing plate, and the rear fixing plate slides towards the front fixing plate so as to clamp teeth in the occlusion groove. The first driving assembly drives the upper supporting plate and the lower supporting plate to rotate, so that the oral cavity of a user is expanded to a fixed angle to limit the occlusion action of the user, the second driving assembly drives the rear fixing plate to slide towards the front fixing plate to clamp the teeth of the user, and the mouth opening action of the user is limited; the temporomandibular joint movement of a user during examination is avoided, and the quality of examination images is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to an opening device for magnetic resonance imaging (MRI) examination of the temporomandibular joint. Background Art

[0002] When using magnetic resonance imaging to examine the temporomandibular joint, the patient's mouth needs to be opened and closed to different degrees to dynamically observe the condition of the temporomandibular joint, such as the position, morphology, signal changes and intra-articular fluid accumulation of the articular disc. This examination requires the patient to keep his mouth open at an appropriate angle for a long time, generally for 6 to 10 minutes. During this process, the patient's unconscious biting or opening of the mouth will cause motion artifacts in the examination image, resulting in distorted examination results.

[0003] In the patent with announcement number CN221356867U, an opener for magnetic resonance imaging examination of the temporomandibular joint is proposed. The opener is provided with a nut and an arc-shaped elastic plate. The arc-shaped elastic plate is compressed by rotating the nut. When the arc-shaped elastic plate is compressed, it drives the two arc-shaped support plates to move and adjust in relative directions. When the arc-shaped elastic plate is reset, it drives the two arc-shaped support plates to move and adjust in opposite directions, thereby controlling the opening angle of the opener. The overall adjustment is relatively simple.

[0004] However, the mouth opener can only limit the patient's biting action and prevent the patient's mouth opening angle from becoming smaller, but cannot limit the patient's mouth opening action. If the patient opens his mouth due to mouth fatigue during use, the patient's mouth opening angle will be increased, thereby causing the patient's temporomandibular joint to move during the examination, reducing the quality of the examination image. Utility Model Content

[0005] The utility model provides an opening device for magnetic resonance imaging (MRI) examination of the temporomandibular joint, which has the advantage of limiting the biting and opening movements of the user, thereby solving the problems raised in the background technology.

[0006] To achieve the purpose of limiting the user's biting and mouth opening movements, the present invention provides the following technical solutions: an opening device for magnetic resonance imaging (MRI) examination of the temporomandibular joint, comprising a fixing assembly, the fixing assembly comprising an upper support plate and a lower support plate, one end of the upper support plate and the lower support plate being rotatably connected by a rotating shaft, the upper support plate and the lower support plate being used to open the oral cavity; an occlusal groove, the occlusal grooves being respectively provided on surfaces on opposite sides of the upper support plate and the lower support plate, and the two occlusal grooves being located at an end away from the rotating shaft, the occlusal grooves being used to accommodate teeth; a first driving assembly, the first driving assembly being provided between the upper support plate and the lower support plate, the first driving assembly being used to adjust the opening angle of the upper support plate and the lower support plate; a mouth opening limiting assembly, the mouth opening limiting assembly being provided in the occlusal groove, the mouth opening limiting assembly comprising a front fixing plate fixedly provided in the occlusal groove and away from the rotating shaft, and a rear fixing plate slidably provided in the occlusal groove and close to the rotating shaft, the rear fixing plate sliding toward the front fixing plate to clamp the teeth in the occlusal groove, thereby limiting the patient's mouth opening movement.

[0007] As a preferred technical solution of the present invention, the first driving assembly includes a sliding member slidably connected to the upper support plate and a fixed member fixedly connected to the lower support plate, the sliding member is located at one end of the upper support plate close to the rotating shaft, and the fixed member is located at one end of the lower support plate close to the bite groove, and both the sliding member and the fixed member are provided with an axial connection part, and a connecting rod is provided between the sliding member and the fixed member, and the two ends of the connecting rod are rotatably connected to the two axial connections respectively; a threaded rod is rotatably provided on one side of the upper support plate adjacent to the lower support plate, and the threaded rod is threadedly connected to the sliding member, and the threaded rod rotates to make the sliding member move axially along the threaded rod.

[0008] As a preferred technical solution of the present invention, an installation cavity is provided inside the upper support plate and the lower support plate, a bottom plate is slidably provided in the installation cavity, a plurality of connecting columns are fixedly provided on the side of the bottom plate close to the bite groove, and a plurality of straight grooves are provided on the bottom surface of the bite groove that penetrate into the installation cavity, and the positions of the straight grooves correspond to the positions of the connecting columns, and the connecting columns are fixedly connected to the rear fixed plate after passing through the straight grooves.

[0009] As an optimal technical solution of the present invention, a second drive assembly is provided in the installation cavity, and the second drive assembly is used to slide the rear fixed plate toward the front fixed plate; the second drive assembly includes a transmission rod rotatably arranged inside the threaded rod, and a first ball gear is fixedly provided at one end of the transmission rod close to the rotating shaft, and a second ball gear is provided at one end of the installation cavity close to the rotating shaft, the first ball gear is meshed with the second ball gear, and a connecting shaft is rotatably provided inside the installation cavity, and one end of the connecting shaft is fixedly connected to the second ball gear; the second drive assembly also includes a worm fixedly connected to the other end of the connecting shaft, a turbine is meshed on one side of the worm, and an output gear is provided on the upper or lower side of the turbine, and the turbine is coaxial with the output gear; a connecting frame is fixed on the side of the base plate away from the engaging groove, and a rack is fixed on the connecting frame corresponding to the output gear, and the output gear is meshed with the rack.

[0010] As a preferred technical solution of the present invention, the extension line of the axis of the rotating shaft passes through the center of the second ball gear located on the lower support plate, so that the second ball gear engages with the first ball gear when rotating.

[0011] As a preferred technical solution of the present invention, the surfaces of the adjacent sides of the upper support plate and the lower support plate are both provided with sunken grooves, and the two sunken grooves are combined into an accommodating groove when the surfaces of the adjacent sides of the upper support plate and the lower support plate are in contact. At this time, the first driving assembly is located in the accommodating groove; the fixing member is provided with a clearance groove, and the clearance groove is used to accommodate the threaded rod when the surfaces of the adjacent sides of the upper support plate and the lower support plate are in contact.

[0012] As a preferred technical solution of the present invention, the threaded rod and the transmission rod pass through the surface of the upper support plate at one end close to the engagement groove to form a through portion, the transmission rod is fixedly provided with a second knob at one end close to the through portion, and the threaded rod is fixedly provided with a first knob at one end close to the through portion.

[0013] Compared with the prior art, the present invention provides an opening device for MRI examination of the temporomandibular joint, which has the following beneficial effects:

[0014] 1. The opening device for MRI examination of the temporomandibular joint is provided with a first drive assembly, an upper support plate and a lower support plate. The first drive assembly drives the upper support plate and the lower support plate to rotate, thereby opening the user's mouth to a fixed angle and limiting the user's biting action. A second drive assembly and a rear fixing plate are provided. The second drive assembly drives the rear fixing plate to slide toward the front fixing plate to clamp the user's teeth and limit the user's mouth opening action. By simultaneously limiting the user's biting and mouth opening actions, the user's temporomandibular joint movement during the examination is avoided, thereby improving the quality of the examination image.

[0015] 2. The opening device for magnetic resonance imaging of the temporomandibular joint is provided with a first ball gear and a second ball gear, so that when the upper support plate and the lower support plate rotate, the torque of the transmission rod can still be transmitted to the connecting shaft through the first ball gear and the second ball gear, thereby driving the rear fixing plate to move, so that the expansion action driven by the first drive component and the clamping action driven by the second drive component do not interfere with each other, thereby improving the convenience of using the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the closed state structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the utility model in the expanded state;

[0018] Figure 3 This is a side view of the utility model in the expanded state;

[0019] Figure 4 This is a schematic diagram of the bottom structure of the upper support plate of the utility model;

[0020] Figure 5 This is a schematic diagram of the internal structure of the upper support plate of the utility model;

[0021] Figure 6 This is a top view of the internal structure of the upper support plate of the utility model;

[0022] Figure 7 This is a bottom view of the fixing frame, bottom plate and rear fixing plate of the utility model;

[0023] Figure 8 This is a position relationship diagram of the first ball gear and the second ball gear of the utility model;

[0024] Figure 9 It is the rear view of the present utility model.

[0025] In the figure: 1. Upper support plate; 2. Lower support plate; 3. Engaging groove; 301. Straight groove; 4. Front fixing plate; 5. Rear fixing plate; 6. Fixing part; 601. Give way groove; 7. Sliding part; 8. Threaded rod; 9. Support rod; 10. Connecting rod; 11. First knob; 12. Second knob; 13. Mounting cavity; 1301. Fixing block; 14. First ball gear; 15. Second ball gear; 16. Connecting shaft; 17. Worm; 1701. Turbine; 18. Output gear; 19. Bottom plate; 1901. Connecting column; 20. Connecting frame; 2001. Rack; 21. Transmission rod; 22. Rotating shaft; 23. Axial connection; 24. Sinking groove. DETAILED DESCRIPTION

[0026] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] The following is based on Figure 1 - Figure 9 The present invention describes an opening device for magnetic resonance imaging (MRI) examination of the temporomandibular joint. It should be noted that all components proposed below are made of non-metallic materials to prevent the device from being displaced under the action of a magnetic field.

[0028] See also Figure 1 - Figure 3 The utility model discloses an opening device for magnetic resonance imaging (MRI) examination of the temporomandibular joint, including a fixing assembly, which includes an upper support plate 1 and a lower support plate 2. The upper support plate 1 and the lower support plate 2 are provided with arc-shaped surfaces that fit the user's mouth to avoid injuring the mouth tissue, and one end of the upper support plate 1 and the lower support plate 2 are rotatably connected by a rotating shaft 22, so that the upper support plate 1 and the lower support plate 2 can rotate around the rotating shaft 22 to open the user's mouth, thereby rotating the temporomandibular joint.

[0029] Bite grooves 3 are provided on the surfaces of the opposite sides of the upper support plate 1 and the lower support plate 2, and the two bite grooves 3 are located at the end away from the rotating shaft 22. When the device is placed in the user's mouth, the user's teeth can bite into the bite grooves 3 to play a supporting role.

[0030] A first drive assembly is provided between the upper support plate 1 and the lower support plate 2. The first drive assembly is used to adjust the opening angle of the upper support plate 1 and the lower support plate 2, and control the rotation or locking of the upper support plate 1 and the lower support plate 2, so that the user's mouth can be opened to a fixed angle through the device. The user's biting action can be restricted by the upper support plate 1, the lower support plate 2 and the first drive assembly.

[0031] A mouth opening limiting assembly is provided in the occlusal groove 3, and the mouth opening limiting assembly includes a front fixing plate 4 fixed in the occlusal groove 3 and away from the side of the rotating shaft 22, and a rear fixing plate 5 slidably provided in the occlusal groove 3 and close to the side of the rotating shaft 22. After the user's mouth is opened by the first driving assembly, the rear fixing plate 5 can be slid toward the front fixing plate 4 to clamp the user's teeth, thereby fixing the user's teeth to the device to avoid the patient from opening his mouth during a long period of MRI examination. When in use, a silicone sleeve can be provided on the outer surface of the front fixing plate 4 and the rear fixing plate 5 to protect the user's teeth.

[0032] In this embodiment, the first drive assembly drives the upper support plate 1 and the lower support plate 2 to rotate, thereby expanding the user's mouth to a fixed angle and limiting the user's biting action. The rear fixing plate 5 can slide toward the front fixing plate 4 to clamp the user's teeth and limit the user's mouth opening action. By simultaneously limiting the user's biting and mouth opening actions, the user's temporomandibular joint is avoided from moving during the examination, thereby improving the quality of the examination image.

[0033] Combine Figure 2-Figure 4 The first driving assembly includes a sliding member 7 slidably connected to the upper support plate 1 and a fixing member 6 fixedly connected to the lower support plate 2. The sliding member 7 and the fixing member 6 are both straight rod-shaped. The sliding member 7 is located on one end of the upper support plate 1 close to the rotating shaft 22, and the fixing member 6 is located on one end of the lower support plate 2 close to the engaging groove 3. A shaft connection portion 23 is provided on both the sliding member 7 and the fixing member 6. A connecting rod 10 is provided between the sliding member 7 and the fixing member 6, so that the two ends of the connecting rod 10 are rotatably connected to the two shaft connections 23 respectively.

[0034] In addition, in order to facilitate the movement of the sliding member 7, a threaded rod 8 is rotatably provided on one side of the upper support plate 1 adjacent to the lower support plate 2. The thread on the threaded rod 8 only needs to be opened in a section corresponding to the movement path of the sliding member 7, so that the threaded rod 8 is threadedly connected to the sliding member 7, so that the sliding member 7 can be moved axially along the threaded rod 8 by rotating the threaded rod 8. Preferably, the threaded rod 8 is connected to the middle part of the sliding member 7, so that the sliding member 7 is evenly stressed.

[0035] Optionally, multiple support rods 9 are arranged on one side of the upper support plate 1 close to the lower support plate 2 and parallel to the threaded rod 8. The support rods 9 are fixedly connected to the upper support plate 1, and the multiple support rods 9 are symmetrically arranged about the axis of the threaded rod 8, so that both sides of the sliding member 7 are supported, thereby improving the stability of the movement, and multiple connecting rods 10 are arranged between the sliding member 7 and the fixed member 6, thereby improving the stability and connection strength of the connection between the upper support plate 1 and the lower support plate 2.

[0036] In this embodiment, the fixing member 6, the sliding member 7, the threaded rod 8, the support rod 9 and the connecting rod 10 are all made of ceramic or hard plastic. When the sliding member 7 moves, the end of the connecting rod 10 close to the sliding member 7 moves together with the sliding member 7, and the end of the connecting rod 10 close to the fixing member 6 rotates around the axial connection portion 23, thereby causing the connecting rod 10 to move from a horizontal state to a vertical state, thereby increasing the angle between the upper support plate 1 and the lower support plate 2, and opening the user's mouth. When the user bites down hard, the self-locking effect between the threaded rod 8 and the sliding member 7 prevents the sliding member 7 from moving in the opposite direction, thereby fixing the angle between the upper support plate 1 and the lower support plate 2, so as to facilitate the inspection of the user's temporomandibular joint at different mouth opening degrees.

[0037] Combine Figure 5 and Figure 6In order to enable the rear fixing plate 5 to maintain support for the user's teeth while moving, an installation cavity 13 is provided inside the upper support plate 1 and the lower support plate 2, and a bottom plate 19 is slidably provided in the installation cavity 13. The contour of the bottom plate 19 is arc-shaped to correspond to the shape of the rear fixing plate 5, and a plurality of connecting posts 1901 are fixedly provided on the side of the bottom plate 19 close to the occlusal groove 3. Preferably, the plurality of connecting posts 1901 are equidistantly arranged, and a plurality of straight grooves 301 penetrating into the installation cavity 13 are provided on the bottom surface of the occlusal groove 3. The positions of the straight grooves 301 correspond to the positions of the connecting posts 1901, so that each connecting post 1901 can pass through the corresponding straight groove 301 and be fixedly connected to the rear fixing plate 5, so that the occlusal groove 3 maintains support for the user's teeth while avoiding friction with the user's teeth due to the movement of the rear fixing plate 5, causing discomfort to the user.

[0038] Combine Figure 5 - Figure 8 In order to facilitate the movement of the rear fixing plate 5, a second driving assembly is provided in the installation cavity 13. The second driving assembly is used to make the rear fixing plate 5 slide toward the front fixing plate 4 or slide away from the front fixing plate 4.

[0039] The second drive assembly includes a transmission rod 21 that is rotatably arranged inside the threaded rod 8. In order to facilitate the installation of the transmission rod 21, the threaded rod 8 is a hollow structure. A first ball gear 14 is fixedly provided at one end of the transmission rod 21 near the rotating shaft 22, and a second ball gear 15 is provided at one end of the mounting cavity 13 near the rotating shaft 22. The first ball gear 14 is meshed with the second ball gear 15, so that the transmission rod 21 can drive the second ball gear 15 to rotate by driving the first ball gear 14 to rotate. A connecting shaft 16 is rotatably provided inside the mounting cavity 13, so that one end of the connecting shaft 16 is fixedly connected to the second ball gear 15. Although the ball gears are more worn and are not suitable for high speed situations However, the rotational speeds of the transmission rod 21 and the connecting shaft 16 are not high, so they can be transmitted through ball gears. A fixed block 1301 can also be provided inside the mounting cavity 13, and the connecting shaft 16 can be rotatably mounted on the fixed block 1301, thereby improving the rotation stability of the connecting shaft 16. A worm 17 is fixed to the other end of the connecting shaft 16, and a turbine 1701 is engaged with one side of the worm 17. Preferably, the axis of the turbine 1701 is arranged perpendicular to the bottom surface of the mounting cavity 13, thereby reducing the thickness required for installing the turbine, so as to reduce the overall thickness of the device. An output gear 18 is provided on the upper or lower side of the turbine 1701, and the turbine 1701 is coaxial with the output gear 18.

[0040] In addition, a connecting frame 20 is fixedly provided on the side of the bottom plate 19 away from the engaging groove 3. The connecting frame 20 can be slidably connected to the bottom surface of the installation cavity 13, or directly contact the bottom surface of the installation cavity 13. A rack 2001 is fixedly provided on the connecting frame 20 corresponding to the output gear 18. The output gear 18 is engaged with the rack 2001, so that the second ball gear 15 drives the worm 17 and the turbine 1701 to rotate through the connecting shaft 16, and then drives the output gear 18 to drive the rack 2001, so that the connecting frame 20 moves, thereby driving the rear fixed plate 5 to move.

[0041] In this embodiment, the transmission rod 21, the first ball gear 14, the second ball gear 15, the connecting shaft 16, the worm 17, the turbine 1701, the gear 18 and the connecting frame 20 are all made of ceramic or hard plastic. By providing the first ball gear 14 and the second ball gear 15, when the upper support plate 1 and the lower support plate 2 rotate, the torque of the transmission rod 21 can still be transmitted to the connecting shaft 16 through the first ball gear 14 and the second ball gear 15, thereby driving the rear fixed plate 5 to move, so that the expansion action driven by the first drive component and the clamping action driven by the second drive component do not interfere with each other, thereby improving the convenience of using the device; the cooperation of the turbine 1701 and the worm 17 makes the rear fixed plate 5 self-locking, without the need to provide an additional locking mechanism.

[0042] Combine Figure 8 and Figure 9 In order to ensure that the first ball gear 14 and the second ball gear 15 are in a meshing state when the upper support plate 1 and the lower support plate 2 rotate, the extension line of the axis of the rotating shaft 22 passes through the center of the second ball gear 15 on the lower support plate 2, so that the axis of the rotating shaft 22 is close to one side of the lower support plate 2, so that the second ball gear 15 is meshed with the first ball gear 14 when rotating. In fact, when the upper support plate 1 and the lower support plate 2 rotate, the positions of the second ball gear 15 and the first ball gear 14 on the upper support plate 1 remain unchanged, and the second ball gear 15 and the first ball gear 14 on the lower support plate 2 rotate relative to each other, so that the torque of the transmission rod 21 is transmitted to the connecting shaft 16 in the upper support plate 1 and the lower support plate 2.

[0043] Combine Figure 2 and Figure 4 In order to reduce the thickness of the device and make the overall structure of the device more compact, a sunken groove 24 is opened on the surface of the adjacent side of the upper support plate 1 and the lower support plate 2. When the two sunken grooves 24 contact the surfaces of the adjacent side of the upper support plate 1 and the lower support plate 2, they form a receiving groove. At this time, the first drive component is located in the receiving groove to facilitate placement in the user's mouth.

[0044] In addition, a clearance groove 601 is provided on the fixing member 6, and the clearance groove 601 is used to accommodate the threaded rod 8 when the surfaces of the adjacent sides of the upper support plate 1 and the lower support plate 2 are in contact. Accordingly, when the support rod 9 is added, an additional clearance groove 601 needs to be provided on the fixing member 6 to accommodate the support rod 9.

[0045] Combine Figure 4 or Figure 5 In order to facilitate the driving of the threaded rod 8 and the transmission rod 21 to rotate, a through portion is formed at the end of the threaded rod 8 and the transmission rod 21 near the engaging groove 3, and a second knob 12 is fixedly provided at the end of the transmission rod 21 near the through portion, and a first knob 11 is fixedly provided at the end of the threaded rod 8 near the through portion, so that the threaded rod 8 and the transmission rod 21 can be driven to rotate by the first knob 11 and the second knob 12, which facilitates the use of the device.

[0046] When the user's mouth needs to be opened, the first knob 11 is turned to drive the threaded rod 8 to rotate, so that the sliding member 7 moves in the direction close to the first knob 11, and the sliding member 7 drives the connecting rod 10 to rotate around the fixing member 6 on the lower support plate 2. When the angle between the upper support plate 1 and the lower support plate 2 reaches the required angle, the first knob 11 is stopped, and then the second knob 12 is turned to drive the transmission rod 21 to rotate, and the torque of the transmission rod 21 is transmitted to the connecting shaft 16 through the first ball gear 14 and the second ball gear 15. The connecting shaft 16 drives the worm 17 and the worm wheel 1701 to rotate, and then drives the output gear 18 to rotate. The output gear 18 drives the connecting frame 20 to move by driving the rack 2001, so that the rear fixing plate 5 slides towards the front fixing plate 4 to clamp the user's teeth, thereby limiting the user's mouth opening action. When the mouth opening restriction needs to be released, the second knob 12 is turned in the opposite direction.

[0047] In summary, the opening device for magnetic resonance imaging of the temporomandibular joint is provided with a first driving component, an upper support plate 1 and a lower support plate 2. The first driving component drives the upper support plate 1 and the lower support plate 2 to rotate, thereby opening the user's mouth to a fixed angle and limiting the user's biting action. A second driving component and a rear fixing plate 5 are provided. The second driving component drives the rear fixing plate 5 to slide toward the front fixing plate 4 to clamp the user's teeth and limit the user's mouth opening action. Then, by simultaneously limiting the user's biting and mouth opening actions, the user's temporomandibular joint is avoided from moving during the examination, thereby improving the quality of the examination image; by providing the first ball gear 14 and the second ball gear 15, when the upper support plate 1 and the lower support plate 2 rotate, the torque of the transmission rod 21 can still be transmitted to the connecting shaft 16 through the first ball gear 14 and the second ball gear 15, thereby driving the rear fixing plate 5 to move, so that the opening action driven by the first driving component and the clamping action driven by the second driving component do not interfere with each other, thereby improving the convenience of using the device.

[0048] It should be noted that, in this document, terms such as "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0049] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An opening device for magnetic resonance imaging of the temporomandibular joint, characterized in that: include: A fixing assembly, the fixing assembly comprising an upper support plate (1) and a lower support plate (2), one end of the upper support plate (1) and the lower support plate (2) being rotatably connected via a rotating shaft (22), and the upper support plate (1) and the lower support plate (2) being used to open the oral cavity; An occlusal groove (3), wherein the occlusal groove (3) is respectively formed on surfaces of opposite sides of the upper support plate (1) and the lower support plate (2), and the two occlusal grooves (3) are located at an end away from the rotating shaft (22), and the occlusal groove (3) is used to accommodate teeth; A first drive assembly, the first drive assembly being arranged between the upper support plate (1) and the lower support plate (2), and the first drive assembly being used to adjust the opening angle of the upper support plate (1) and the lower support plate (2); A mouth opening limiting component is provided in the occlusal groove (3), and comprises a front fixing plate (4) fixed in the occlusal groove (3) and away from the rotating shaft (22), and a rear fixing plate (5) slidably provided in the occlusal groove (3) and close to the rotating shaft (22). The rear fixing plate (5) slides toward the front fixing plate (4) to clamp the teeth in the occlusal groove (3), thereby limiting the patient's mouth opening movement.

2. The opening device for MRI examination of the temporomandibular joint according to claim 1, characterized in that: The first driving assembly comprises a sliding member (7) slidably connected to the upper support plate (1) and a fixing member (6) fixedly connected to the lower support plate (2), the sliding member (7) being located on one end of the upper support plate (1) close to the rotating shaft (22), the fixing member (6) being located on one end of the lower support plate (2) close to the engaging groove (3), the sliding member (7) and the fixing member (6) being both provided with an axial connection portion (23), a connecting rod (10) being provided between the sliding member (7) and the fixing member (6), and the two ends of the connecting rod (10) being rotatably connected to the two axial connections (23) respectively; A threaded rod (8) is rotatably provided on one side of the upper support plate (1) adjacent to the lower support plate (2); the threaded rod (8) is threadedly connected to the sliding member (7); the threaded rod (8) rotates to allow the sliding member (7) to move axially along the threaded rod (8).

3. The opening device for MRI examination of the temporomandibular joint according to claim 1, characterized in that: The upper support plate (1) and the lower support plate (2) are both provided with an installation cavity (13), a bottom plate (19) is slidably provided in the installation cavity (13), a plurality of connecting columns (1901) are fixedly provided on a side of the bottom plate (19) close to the bite groove (3), a plurality of straight grooves (301) penetrating to the installation cavity (13) are provided on the bottom surface of the bite groove (3), the positions of the straight grooves (301) correspond to the positions of the connecting columns (1901), and the connecting columns (1901) are fixedly connected to the rear fixing plate (5) after passing through the straight grooves (301).

4. The opening device for MRI examination of the temporomandibular joint according to claim 3, characterized in that: A second driving assembly is provided in the installation cavity (13), and the second driving assembly is used to make the rear fixing plate (5) slide toward the front fixing plate (4); The second driving assembly includes a transmission rod (21) rotatably arranged inside the threaded rod (8), a first ball gear (14) is fixedly provided at one end of the transmission rod (21) close to the rotating shaft (22), a second ball gear (15) is provided at one end of the mounting cavity (13) close to the rotating shaft (22), the first ball gear (14) is meshed with the second ball gear (15), a connecting shaft (16) is rotatably provided inside the mounting cavity (13), and one end of the connecting shaft (16) is fixedly connected to the second ball gear (15); The second drive assembly further comprises a worm (17) fixedly connected to the other end of the connecting shaft (16); a turbine (1701) is meshed with one side of the worm (17); an output gear (18) is provided on the upper side or the lower side of the turbine (1701); and the turbine (1701) and the output gear (18) are coaxial; A connecting frame (20) is fixedly provided on one side of the bottom plate (19) away from the occlusal groove (3), and a rack (2001) is fixedly provided on the connecting frame (20) at a position corresponding to the output gear (18), and the output gear (18) is meshed with the rack (2001).

5. The opening device for MRI examination of the temporomandibular joint according to claim 4, characterized in that: The extension line of the axis of the rotating shaft (22) passes through the center of the second ball gear (15) located on the lower support plate (2), so that the second ball gear (15) is engaged with the first ball gear (14) when rotating.

6. The opening device for MRI examination of the temporomandibular joint according to claim 2, characterized in that: The surfaces of the adjacent sides of the upper support plate (1) and the lower support plate (2) are both provided with a sinking groove (24), and when the surfaces of the adjacent sides of the upper support plate (1) and the lower support plate (2) contact each other, the two sinking grooves (24) form a receiving groove, and at this time, the first driving component is located in the receiving groove; The fixing member (6) is provided with a clearance groove (601), and the clearance groove (601) is used to accommodate the threaded rod (8) when the surfaces of the upper support plate (1) and the lower support plate (2) on adjacent sides are in contact.

7. The opening device for MRI examination of the temporomandibular joint according to claim 4, characterized in that: One end of the threaded rod (8) and the transmission rod (21) near the engaging groove (3) passes through the surface of the upper support plate (1) to form a through portion, and one end of the transmission rod (21) near the through portion is fixedly provided with a second knob (12), and one end of the threaded rod (8) near the through portion is fixedly provided with a first knob (11).

Images