Ear clip positioning mechanism, ear clip positioning device, head positioning device and oral cavity CBCT equipment

Abstract

The utility model relates to an ear clip positioning mechanism, an ear clip positioning device, a head positioning device and oral cavity CBCT equipment, the ear clip positioning mechanism comprises two ear clip assemblies, each ear clip assembly comprises an ear clip rod, a reducing sleeve and a clamping plate, each ear clip rod is provided with a first end, and the first ends of the two ear clip rods can move in the direction close to or away from each other; the reducing sleeve is connected to the first end of the ear clip rod, the reducing sleeve can move and rotate in the axial direction of the ear clip rod, the clamping plate is connected to the reducing sleeve and located in the containing space, and the clamping plate can deflect relative to the reducing sleeve. According to the ear clip positioning mechanism, by adjusting the moving position and the rotating angle of the reducing sleeve relative to the ear clip rod and the deflection angle of the clamping plate relative to the reducing sleeve, the position of the clamping plate can be adjusted in the three-degree-of-freedom direction, so that the clamping plate can be attached to the head of a patient, and the head of the patient is rapidly clamped and fixed; the fixing reliability of the ear clip positioning mechanism to the head of the patient is improved, and the adjustable clamping plate can adapt to physiological anatomy sizes of the heads of different patients.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to an ear clip positioning mechanism, an ear clip positioning device, a head positioning device, and an oral CBCT device. Background Technology

[0002] Dental cone beam computed tomography (CBCT) is an X-ray imaging technique that uses cone beam computed tomography to display normal and diseased tissue structures of the oral and maxillofacial region and even the entire skull in axial, coronal, sagittal, and stereoscopic views. For example, when capturing a panoramic view of the oral and maxillofacial region, X-ray sources and sensors on both sides of a C-arm rotate around the patient's head, which is positioned by a fixation device, to acquire image data.

[0003] Currently, the positioning and fixation devices for fixing the patient's head cannot adapt to different physiological and anatomical dimensions. Because the positioning and fixation devices do not have left and right clamping components or use soft straps for locking, the fixing of the positioning and fixation devices is cumbersome and the fixation reliability is low. Patients cannot maintain a static posture for a long time, and artifacts are easily generated during the image taking process. Utility Model Content

[0004] Therefore, it is necessary to provide an ear clip positioning mechanism, an ear clip positioning device, a head positioning device, and an oral CBCT device to address the problems that existing positioning and fixation devices for fixing the patient's head cannot adapt to different physiological and anatomical sizes, and that the fixation is cumbersome and has low reliability.

[0005] An ear clip positioning mechanism, the ear clip positioning mechanism comprising:

[0006] Two ear clip assemblies are spaced apart and have a space for accommodating the patient's head;

[0007] The ear clip assembly includes an ear clip rod, an adapter sleeve, and a clamp plate. The ear clip rod has a first end, and the first ends of the two ear clip rods can move toward each other or away from each other. The adapter sleeve is connected to the first end of the ear clip rod and can move and rotate along the axial direction of the ear clip rod. The clamp plate is connected to the adapter sleeve and is located in the receiving space. The clamp plate can deflect relative to the adapter sleeve.

[0008] In one embodiment, the adapter sleeve has an insertion hole that can be inserted into the ear clip rod, and when the adapter sleeve is connected to the ear clip rod, the insertion hole is tightly fitted with the outer circular surface of the ear clip rod.

[0009] In one of the embodiments, the adapter sleeve has a deformation hole communicating with the insertion hole, wherein the adapter sleeve is elastic or thin-walled.

[0010] In one of the embodiments, the ear clip rod is provided with a clamping groove near the first end, and the adapter sleeve is provided with a clamping portion protruding from the side wall forming the insertion hole and extending into the insertion hole.

[0011] When the adapter sleeve is connected to the ear clip rod, the clamping portion is clamped in the clamping groove, and between the clamping portion and the clamping groove in the axial direction of the ear clip rod, there is a movement space for the adapter sleeve to move, and in the circumferential direction of the ear clip rod, the clamping portion and the clamping groove have a clearance for the adapter sleeve to rotate.

[0012] In one of the embodiments, the outer circumferential surface of the adapter sleeve protrudes an adapter shaft, the clamping plate is connected to the adapter shaft and can be deflected relative to the adapter shaft.

[0013] In one of the embodiments, the clamping plate has a clamping portion for clamping and fixing the patient's head and a connecting portion provided with an arc-shaped groove capable of being clamped in the adapter shaft and deflected relative to the adapter shaft.

[0014] In one of the embodiments, the adapter shaft is provided with a groove opening on the outer surface of the adapter shaft, and the connecting portion is further provided with a boss protruding from the side wall forming the arc-shaped groove and extending into the arc-shaped groove.

[0015] When the arc-shaped groove is clamped in the adapter shaft, the boss is clamped in the groove, and the boss and the groove have a clearance.

[0016] In one of the embodiments, the adapter shaft and the connecting portion are both two, and the two adapter shafts protrude from opposite sides of the adapter sleeve, and the two connecting portions are spaced apart and form a positioning groove accommodating the adapter sleeve therebetween.

[0017] In one of the embodiments, the connecting portion is elastic or thin-walled.

[0018] The circular arc angle formed in the circumferential length direction of the arc-shaped groove is α, 180°<α<360°, and the opening of the arc-shaped groove is smaller than the outer diameter of the adapter shaft.

[0019] In one of the embodiments, the clamping plate is an arc-shaped member, the thickness of the two sides of the clamping plate is smaller than the thickness of the middle, and / or the clamping plate is provided with a flexible member at least on the side contacting the patient's head.

[0020] In one of the embodiments, the adapter sleeve has a clamping portion, a plug-in hole, and two deformation holes, the deformation holes have a smaller diameter than the plug-in hole, the two deformation holes are symmetrically arranged on the opposite sides of the plug-in hole, and the two deformation holes and the plug-in hole are in communication, and the clamping portion protrudes from the side wall forming the plug-in hole.

[0021] The outer circumferential surface of the adapter sleeve protrudes two adapter shafts, and the clamping plate has two connecting portions clamped with the two adapter shafts.

[0022] The adapter sleeve has a central symmetry structure with the axis of the plug-in hole.

[0023] In one of the embodiments, the adapter shaft is symmetrically provided with two grooves.

[0024] The connecting portion is provided with a boss, and the boss is movably clamped in any of the grooves of the adapter shaft.

[0025] An ear clip positioning device, the ear clip positioning device comprises:

[0026] The ear clip positioning device according to any one of the above technical solutions, the ear clip rod has a second end away from the first end; and

[0027] Two shafts, the ends of the two shafts are respectively connected to the second ends of the two ear clip rods, and the rotation of the two shafts can drive the first ends of the two ear clip rods to move towards each other or away from each other.

[0028] In one of the embodiments, the shaft is connected to the second end of the ear clip rod through a shaft sleeve.

[0029] A head positioning device, the head positioning device comprises:

[0030] The ear clip positioning device according to any one of the above technical solutions.

[0031] In one of the embodiments, the head positioning device further comprises a base and a driving assembly, the driving assembly is arranged on the base and is in transmission connection with the shaft.

[0032] The driving assembly comprises a threaded shaft, two adjusting blocks, and two rocker arms.

[0033] The threaded shaft is rotatably arranged on the base.

[0034] The two adjusting blocks are arranged on the threaded shaft and are slidable along the extension direction of the threaded shaft.

[0035] One end of each of the two swing arms is connected to one of the two rotating shafts, and the other end of each of the two swing arms is matched to one of the two adjusting blocks, and the adjusting blocks can drive the swing arms to swing during sliding.

[0036] In one of the embodiments, the threaded shaft has a first thread and a second thread matched to the two adjusting blocks, and the first thread and the second thread have opposite rotation directions.

[0037] In one of the embodiments, the adjusting block has an abutting surface, which is a smooth curved surface and is matched to the swing arm in abutting manner.

[0038] The adjusting block also has a stop surface, which is matched to the base to prevent the adjusting block from rotating relative to the threaded shaft.

[0039] In one of the embodiments, the driving assembly further includes an elastic member, which has a deformation direction consistent with the extension direction of the threaded shaft, and two ends of the elastic member are respectively hooked to the two swing arms.

[0040] In one of the embodiments, the driving assembly further includes a connecting block, which is fixed to the base, and the threaded shaft is rotatably inserted into the connecting block.

[0041] In one of the embodiments, the base has at least one hollow part, which is a hollow hole or a hollow slot, and a support part for mounting the threaded shaft and the two rotating shafts is extended from the outer edge of the hollow part or the base to the front surface and / or the back surface of the base, and the support part and the base are integrally formed as a cast member.

[0042] An oral CBCT device, the CBCT device comprising:

[0043] The head positioning device according to any one of the preceding technical solutions.

[0044] The ear clamp positioning mechanism, the ear clamp positioning device, the head positioning device and the oral CBCT device, the patient's head is contained in the containing space, and the two ear clamp assemblies clamp and fix the patient's head. Since the adapter sleeve can move and rotate along the axial direction of the ear clamp rod, the clamping plate can be deflected relative to the adapter sleeve. By adjusting the moving position and the rotation angle of the adapter sleeve relative to the ear clamp rod, and the deflection angle of the clamping plate relative to the adapter sleeve, the position of the clamping plate can be adjusted in three degrees of freedom, so that the clamping plate can be clamped against the patient's head, the ear clamp positioning mechanism can quickly clamp and fix the patient's head, and the clamping plate can adapt to the anatomical size of different patient's heads. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1Structural schematic diagram of the head positioning device provided in some embodiments.

[0046] Figure 2 Exploded schematic diagram of the ear clip assembly provided in some embodiments.

[0047] Figure 3 Structural schematic diagram of the adapter sleeve provided in some embodiments.

[0048] Figure 4 Structural schematic diagram of the clamping plate provided in some embodiments.

[0049] Figure 5 Structural schematic diagram of the ear clip positioning device provided in some embodiments.

[0050] Figure 6 Exploded schematic diagram of the ear clip positioning device provided in some embodiments.

[0051] Figure 7 Structural schematic diagram of the head positioning device provided in some embodiments from one perspective.

[0052] Figure 8 Structural schematic diagram of the head positioning device provided in some embodiments from another perspective.

[0053] Figure 9 Structural schematic diagram of the adjustment block provided in some embodiments.

[0054] Reference signs:

[0055] 100, ear clip positioning mechanism;

[0056] 110, ear clip assembly; 111, accommodation space; 120, ear clip rod; 121, first end; 122, second end; 123, clamping groove; 124, third connecting hole; 130, adapter sleeve; 131, insertion hole; 132, deformation hole; 133, clamping portion; 134, adapter shaft; 1341, groove; 140, clamping plate; 141, clamping portion; 142, connecting portion; 1421, arc-shaped groove; 1422, boss; 143, positioning groove;

[0057] 200, ear clip positioning device; 210, rotating shaft; 211, connecting shaft; 212, locking plane; 213, locking hole; 220, rotating shaft sleeve; 221, first connecting hole; 222, second connecting hole; 223, threaded hole;

[0058] 300, head positioning device;

[0059] 310, base; 311, hollowed part; 320, driving assembly; 321, threaded shaft; 322, adjusting block; 3221, abutting surface; 3222, abutting surface; 3223, body; 3224, protruding part; 323, rocker arm; 330, elastic member; 340, connecting block; 350, knob; 360, supporting part;

[0060] 400, jaw rest. DETAILED DESCRIPTION

[0061] To make the above objectives, features and advantages of the present application more clear and easily understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. In the following description, a lot of specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many different ways other than the embodiments described herein, and one of ordinary skill in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0062] In the description of the present application, it should be understood that if these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0063] In addition, if these terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "a plurality of" appears, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0064] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0065] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0066] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0067] The technical solutions provided by the embodiments of this application are described below with reference to the accompanying drawings.

[0068] See Figure 1 and Figure 2 As shown, this application provides an ear clip positioning mechanism 100, which includes two ear clip assemblies 110. The ear clip positioning mechanism 100 can be used to restrict the position of the patient's head. For example, during oral imaging by the head positioning device 300, the ear clip positioning mechanism 100 can keep the patient's head position fixed, thereby improving the imaging quality and avoiding artifacts during oral imaging.

[0069] Two ear clip assemblies 110 are spaced apart, and each ear clip assembly 110 has a receiving space 111 for accommodating the patient's head. For example, the two ear clip assemblies 110 are arranged along... Figure 1As shown, the two ear clip assemblies 110 are spaced apart along direction A and can abut against the temples of the patient's head along direction A to keep the patient's head in the receiving space 111.

[0070] The ear clip assembly 110 includes an ear clip rod 120, an adapter sleeve 130, and a clip plate 140. The ear clip rod 120 has a first end 121 and a second end 122 in its extending direction, wherein the first end 121 of the ear clip rod 120 is a free end, and the second end 122 of the ear clip rod 120 is a connecting end. The first ends 121 of the two ear clip rods 120 can move toward each other or away from each other. For example, when the first ends 121 of the two ear clip rods 120 move toward each other, the overall space of the accommodating space 111 decreases, and the first ends 121 of the two ear clip rods 120 can abut against the patient's head to keep the patient's head in the accommodating space 111; or when the first ends 121 of the two ear clip rods 120 move away from each other, the overall space of the accommodating space 111 increases, making it easier for the patient's head to enter or exit the accommodating space 111. The adapter sleeve 130 is connected to the first end 121 of the ear clip rod 120, and the adapter sleeve 130 can move along the axial direction of the ear clip rod 120 (such as along...). Figure 2 (as shown by movement in direction B) and rotation in the circumferential direction around the ear clamp 120 (such as around) Figure 2 (as shown by rotation in direction C), the clamp 140 is connected to the adapter sleeve 130 so that when the first ends 121 of the two ear clip rods 120 move toward each other, the two clamps 140, spaced apart along direction A, clamp the patient's head on both sides to keep the patient's head in the receiving space 111, and the clamps 140 can deflect relative to the adapter sleeve 130 (such as around). Figure 2 (as shown, rotation in direction D).

[0071] Thus, by adjusting the moving position and rotation angle of the adapter sleeve 130 relative to the ear clip rod 120, and the deflection angle of the clamp plate 140 relative to the adapter sleeve 130, the position of the clamp plate 140 can be adjusted in three degrees of freedom, allowing the clamp plate 140 to fit against the patient's head for quick clamping and fixation. This improves the reliability of the ear clip positioning mechanism 100 in fixing the patient's head, keeping the patient's head in the accommodating space 111 for an extended period and preventing artifacts during imaging. Furthermore, due to the high degree of adjustability of the clamp plate 140, it can adapt to the physiological and anatomical dimensions of different patients' heads, improving patient comfort during imaging.

[0072] In one embodiment, see Figures 1-3As shown, the adapter sleeve 130 has a insertion hole 131, which can be inserted into the ear clip rod 120. When the adapter sleeve 130 is connected to the ear clip rod 120, the insertion hole 131 and the outer circular surface of the ear clip rod 120 are tightly fitted, and there is frictional resistance between the adapter sleeve 130 and the ear clip rod 120. The outer circular surface of the ear clip rod 120 prevents the adapter sleeve 130 from moving freely, thus achieving a fixed connection between the adapter sleeve 130 and the ear clip rod 120. Furthermore, since the adapter sleeve 130 and the ear clip rod 120 are connected by a hole-shaft fit, the installation and disassembly operations between the adapter sleeve 130 and the ear clip rod 120 can be completed quickly.

[0073] Specifically, see Figures 1-3 As shown, the adapter sleeve 130 has a deformation hole 132 communicating with the insertion hole 131. The adapter sleeve 130 is elastic or a thin-walled part, such as a flexible part such as a plastic part or a rubber part, or a thin-walled metal part, so that the adapter sleeve 130 can deform under the action of external force. During the connection process between the adapter sleeve 130 and the ear clip rod 120, the operator applies force to the outer circular surface of the adapter sleeve 130 by pinching, holding, or grasping, causing the deformation hole 132 to deform. Since the deformation hole 132 is connected to the insertion hole 131, the diameter of the insertion hole 131 changes. When the diameter of the insertion hole 131 increases, the insertion hole 131 can pass through the end of the ear clip rod 120 and be inserted into the preset position of the ear clip rod 120. After the external force applied to the adapter sleeve 130 is removed, the adapter sleeve 130 returns to its original deformation state, and the insertion hole 131 and the outer circular surface of the ear clip rod 120 are tightly fitted, so that the adapter sleeve 130 can be detachably connected to the ear clip rod 120.

[0074] Further, see Figures 2-4 As shown, the ear clip rod 120 has a locking groove 123 near the first end 121. The adapter sleeve 130 has a locking part 133, which protrudes from the side wall forming the insertion hole 131 and extends into the insertion hole 131. When the adapter sleeve 130 is connected to the ear clip rod 120, the locking part 133 engages with the locking groove 123. In the axial direction of the ear clip rod 120, there is a movement space between the locking part 133 and the locking groove 123 for the adapter sleeve 130 to move, and in the circumferential direction of the ear clip rod 120, there is a movement gap between the locking part 133 and the locking groove 123 for the adapter sleeve 130 to rotate.

[0075] For example, the locking groove 123 is an oblong groove provided on the ear clamp rod 120. The locking groove 123 opens on the outer circular surface of the ear clamp rod 120, and the locking portion 133 extends in the axial direction of the ear clamp rod 120, providing movement space. The position of the locking portion 133 is adjustable along the extension direction of the locking groove 123. When the adapter sleeve 130 is connected to the ear clamp rod 120, the locking portion 133 is loosely fitted in the locking groove 123, limiting the clearance space for the circumferential movement of the locking portion 133. Through this design, the adapter sleeve 130 can be prevented from detaching from the locking groove 123 on its own, while providing a relatively large axial adjustment range and a relatively small circumferential adjustment range for the clamping plate 140, so as to provide a more convenient clamping operation.

[0076] In the axial direction of the ear clip rod 120, the engaging part 133 and the engaging groove 123 have a large range of motion. Under the action of external force, the engaging part 133 can move along the axial direction of the ear clip rod 120 (such as along...). Figure 2 (As shown in direction B), since the clamp 140 is connected to the adapter sleeve 130, the movement of the clamp 140 along the axial direction of the ear clip rod 120 via the adapter sleeve 130 allows adjustment of the clamp 140's position relative to the ear clip rod 120. Furthermore, by changing the axial position of the clamp 140 relative to the ear clip rod 120, it can accommodate patients with different head sizes, further improving the comfort of the patient's head during fixation. For example, when targeting women, children, and the elderly with smaller head sizes, the clamp 140 can be adjusted to the side closer to the second end 122 to reduce the accommodating space 111 for positioning and clamping patients with smaller head sizes; similarly, when targeting men and obese patients with larger head sizes, the clamp 140 can be adjusted to the side closer to the first end 121 to increase the accommodating space 111 for positioning and clamping patients with larger head sizes. In the circumferential direction of the ear clip rod 120, the locking part 133 and the locking groove 123 have a small clearance for movement. Under the action of external force, the locking part 133 can rotate in the circumferential direction of the ear clip rod 120 (such as around). Figure 2 As shown in direction C (rotation), since the clamp 140 is connected to the adapter sleeve 130, the clamp 140 can be adjusted in the circumferential direction of the ear clip rod 120 by rotating the adapter sleeve 130 at a small angle. Thus, the adapter sleeve 130 can drive the clamp 140 to move and rotate relative to the ear clip rod 120, thereby adjusting the connection position of the clamp 140 on the ear clip rod 120. The clamp 140 can adapt to and hold different patients' head anatomy dimensions, improving patient comfort during imaging.

[0077] In one embodiment, see Figures 1-3As shown, the outer circular surface of the adapter sleeve 130 protrudes with an adapter shaft 134. Preferably, the adapter shaft 134 is integrally formed into the adapter sleeve 130 to simplify the forming process of the adapter sleeve 130 and the adapter shaft 134, and to improve the structural strength of the adapter sleeve 130 and the adapter shaft 134. A clamping plate 140 is connected to the adapter shaft 134, and the clamping plate 140 can be deflected relative to the adapter shaft 134 (e.g., around). Figure 2 (as shown by the deflection in direction D), further improving the adjustment freedom of the splint 140, allowing the splint 140 to better adapt to the physiological and anatomical dimensions of different patients' heads.

[0078] Among them, see Figure 3 and Figure 4 As shown, the clip 140 has a clamping part 141 and a connecting part 142. The clamping part 141 is used to clamp and fix the patient's head, and the connecting part 142 is provided with an arc-shaped groove 1421. The arc-shaped groove 1421 can be engaged with the adapter shaft 134, and the arc-shaped groove 1421 can be deflected relative to the adapter shaft 134. In this way, by engaging the arc-shaped groove 1421 with the adapter shaft 134, the clip 140 can be detachably connected to the adapter sleeve 130. For different patients, different sizes of clips 140 can be replaced to fit the patient's head more closely, so that the clip 140 can better adapt to the physiological and anatomical dimensions of different patients' heads, further improving the fixation reliability of the ear clip positioning mechanism 100 for the patient's head.

[0079] Specifically, see Figures 2-4 As shown, the adapter shaft 134 has a groove 1341, which opens onto the outer surface of the adapter shaft 134. The connecting part 142 also has a boss 1422, which protrudes from the sidewall forming the arc-shaped groove 1421 and extends into the arc-shaped groove 1421. When the arc-shaped groove 1421 is engaged with the adapter shaft 134, the boss 1422 is engaged with the groove 1341, and there is a play gap between the boss 1422 and the groove 1341. In this way, by the gap fit of the boss 1422 into the groove 1341, while ensuring the reliability of the connection between the connecting part 142 and the adapter shaft 134, the boss 1422 can be deflected relative to the groove 1341 to adjust the clamping plate 140 relative to the ear clamp rod 120 along... Figure 2 The deflection angle in direction D is shown.

[0080] It should be noted that the gap between the boss 1422 and the groove 1341 should not be too large to prevent the boss 1422 from detaching from the groove 1341 on its own, so as to ensure the reliability of the connection between the clamping plate 140 and the adapter shaft 134. The movable gap between the boss 1422 and the groove 1341 allows the clamping plate 140 to move, so as to adjust the deflection angle of the clamping plate 140 relative to the ear clamp rod 120 within a small range.

[0081] Further, see Figures 2-4As shown, there are two adapter shafts 134 and two connecting portions 142. The two adapter shafts 134 protrude from opposite sides of the adapter sleeve 130, and the two connecting portions 142 are spaced apart, with a positioning groove 143 formed between the two connecting portions 142 to accommodate the adapter sleeve 130. For example, when the clamp 140 needs to be connected to the adapter sleeve 130, the two connecting portions 142 can be respectively snapped onto the two adapter shafts 134, and the adapter sleeve 130 is at least partially accommodated in the positioning groove 143. Since the two adapter shafts 134 protrude from opposite sides of the adapter sleeve 130, the connection reliability and stability between the clamp 140 and the adapter sleeve 130 can be improved, and the clamp 140 can be held in a preset position, improving the positional stability of the clamp 140 and further improving the fixation reliability of the ear clip positioning mechanism 100 for the patient's head.

[0082] Furthermore, see Figures 2-4 As shown, the connecting part 142 is elastic or a thin-walled component, such as a flexible component like a plastic or rubber component, or a thin-walled metal component, allowing it to deform under external force. The arc angle formed by the arc groove 1421 along its circumference is α, where 180° < α < 360°, and the opening of the arc groove 1421 is smaller than the outer diameter of the adapter shaft 134. Thus, when an operator applies force to the connecting part 142 by pinching, gripping, or grasping, the arc groove 1421 deforms, increasing its opening. After the force applied to the connecting part 142 is removed, the arc groove 1421 returns to its original shape and engages with the adapter shaft 134, ensuring that the clamping plate 140 is reliably connected to the adapter sleeve 130. Furthermore, since the arc groove 1421 is an excellent arc, after the connection part 142 elastically resets, the opening of the arc groove 1421 is smaller than the outer diameter of the adapter shaft 134, which prevents the clamping plate 140 from detaching from the adapter sleeve 130 on its own and improves the connection reliability between the clamping plate 140 and the adapter sleeve 130.

[0083] In one embodiment, see Figure 1 and Figure 2 As shown, the splint 140 is an arc-shaped component, which makes the shape of the splint 140 conform to the contour of the patient's head. When the splint 140 is against the patient's head, it can wrap around the outside of the contour of the patient's head, increasing the contact area between the splint 140 and the patient's head, improving the comfort of the patient's head during the fixation process, so as to keep the patient's head in the accommodating space 111 for a long time and avoid artifacts during the imaging process.

[0084] In this embodiment, the thickness of the two sides of the splint 140 is less than the thickness of the middle, and / or, the splint 140 has a flexible element at least on the side that contacts the patient's head. For example, in one embodiment, the thickness of the two sides of the splint 140 is less than the thickness of the middle, making the splint 140 an elastic structure. When the splint 140 is in contact with the patient's head, it can adaptively wrap around the outside of the patient's head, further improving the comfort of the patient's head during the fixation process. In another embodiment, see [continuing to the previous section] Figure 4 As shown, the splint 140 has a flexible component on at least one side that contacts the patient's head. For example, if a soft pad is provided on the clamping part 141 by means of bonding or wrapping, the comfort of the patient's head during the fixation process can be further improved.

[0085] Further, see Figure 1 and Figure 2 As shown, the ear clip 120 is made of carbon fiber tubing to achieve X-ray transmission and avoid blocking X-rays, thus reducing artifacts during imaging. Furthermore, the high rigidity and low density of the carbon fiber tubing ensures the strength of the ear clip 120 during clamping.

[0086] In one embodiment, see Figures 1-4 As shown, the adapter sleeve 130 has a snap-fit ​​portion 133, a insertion hole 131, and two deformation holes 132. The adapter shaft 134 is centrally symmetrical about the axis of the insertion hole 131. The diameter of the deformation hole 132 is smaller than the diameter of the insertion hole 131. The two deformation holes 132 are symmetrically arranged on opposite sides of the insertion hole 131. Figure 3 The two deformation holes 132 are symmetrically arranged on opposite sides of the insertion hole 131 in the direction E shown, and both are connected to the insertion hole 131. The snap-fit ​​part 133 protrudes from the side wall forming the insertion hole 131. The outer circular surface of the adapter sleeve 130 has two adapter shafts 134 protruding from it, and the clamping plate 140 has two connecting parts 142 that snap-fit ​​with the two adapter shafts 134.

[0087] Thus, when the operator applies pressure to the outer surface of the adapter sleeve 130 by pinching, gripping, or grasping, the deformation holes 132 on both sides... Figure 3 As shown, deformation occurs in direction E. Since the deformation hole 132 is connected to the insertion hole 131, the diameter of the insertion hole 131 after being compressed moves along... Figure 3 As shown, the F direction changes, and when the diameter of the insertion hole 131 increases, the insertion hole 131 can pass through the end of the ear clip rod 120 and be inserted into the preset position of the ear clip rod 120. After the external force applied to the adapter sleeve 130 is removed, the deformation holes 132 on both sides change along... Figure 3As shown, the insertion hole 131 elastically resets in the reverse direction E, causing the locking part 133 to engage with the locking groove 123. The insertion hole 131 tightly fits the outer surface of the ear clip rod 120, enabling the adapter sleeve 130 to be detachably connected to the ear clip rod 120. Furthermore, since two adapter shafts 134 protrude from the outer surface of the adapter sleeve 130, if the two adapter shafts 134 along... Figure 3 As shown, the two connecting parts 142 of the clamping plate 140 are symmetrically arranged on opposite sides of the adapter sleeve 130 in the F direction. The two connecting parts 142 are engaged with the two adapter shafts 134. On the one hand, the two connecting parts 142 can improve the reliability and stability of the connection between the clamping plate 140 and the adapter sleeve 130. On the other hand, the two connecting parts 142 can restrict the autonomous deformation of the adapter sleeve 130 and prevent the clamping plate 140 from detaching from the adapter shaft 134.

[0088] Further, see Figures 1-4 As shown, the adapter shaft 134 has two symmetrically arranged grooves 1341, and the connecting part 142 has a boss 1422, which can be movably engaged with either groove 1341 of the adapter shaft 134. Thus, when the clamping plate 140 needs to be connected to the adapter shaft 134, only the boss 1422 needs to be engaged with either groove 1341, without needing to distinguish the installation direction of the clamping plate 140, improving the convenience and efficiency of the installation operation of the clamping plate 140. Furthermore, since the boss 1422 is movably engaged with the groove 1341, the boss 1422 can be deflected relative to the groove 1341 to adjust the clamping plate 140 relative to the ear clamp rod 120 along... Figure 2 The deflection angle in direction D is shown.

[0089] Additionally, see Figure 1 , Figure 2 and Figure 5 As shown, the ear clip positioning device 200 includes two rotating shafts 210 and an ear clip positioning mechanism 100 as described above. The ends of the two rotating shafts 210 are respectively connected to the second ends 122 of the two ear clip rods 120. The rotation of the two rotating shafts 210 can drive the first ends 121 of the two ear clip rods 120 to move toward each other or away from each other.

[0090] The ear clip positioning device 200 described above has two rotating shafts 210 connected to the second ends 122 of two ear clip rods 120. When the rotating shafts 210 are driven to rotate, the rotating shafts 210 drive the second ends 122 of the ear clip rods 120 to rotate. Since the first ends 121 of the ear clip rods 120 are free ends, the first ends 121 of the two ear clip rods 120 can move toward each other or away from each other, controlling the opening and closing of the first ends 121 of the two ear clip rods 120 to adapt to the clamping and fixing of different patients' heads, and to facilitate the entry or exit of the patient's head into or out of the receiving space 111.

[0091] Further, see Figure 1 ,Figure 2 and Figure 5 As shown, the rotating shaft 210 is connected to the second end 122 of the ear clip rod 120 via the rotating shaft sleeve 220. Since the rotating shaft 210 is a slender rod and the ear clip rod 120 is also a slender rod, the rotating shaft sleeve 220 facilitates the connection between the rotating shaft 210 and the ear clip rod 120. When the rotating shaft 210 rotates, the two rotating shafts 210 can drive the two ear clip rods 120 to swing through the rotating shaft sleeve 220, thereby controlling the opening and closing of the two ear clip rods 120.

[0092] For example, see [link to relevant documentation] Figures 6-8 As shown in this embodiment, the rotating sleeve 220 is provided with a first connecting hole 221, a second connecting hole 222, and a screw hole 223. The first connecting hole 221, the second connecting hole 222, and the screw hole 223 all open on the outer circumferential surface of the rotating sleeve 220, and the first connecting hole 221, the second connecting hole 222, and the screw hole 223 are interconnected. The ear clip rod 120 is provided with a third connecting hole 124 on the side near the second end 122, and the end of the rotating shaft 210 has a connecting shaft 211, a locking plane 212, and a locking hole 213. The second end 122 of the ear clip rod 120 can be inserted into the first connecting hole 221. When the ear clip rod 120 is inserted into the first connecting hole 221, the third connecting hole 124 is connected to the second connecting hole 222. The connecting shaft 211 can be inserted into the second connecting hole 222 and the third connecting hole 124. When the connecting shaft 211 is inserted into the second connecting hole 222 and the third connecting hole 124, the locking hole 213 is connected to the screw hole 223. The adapter sleeve 220 has a stop surface (not shown) that abuts against the locking surface 212. Specifically, when the ear clip rod 120 needs to be connected to the rotating shaft 210, the second end 122 of the ear clip rod 120 is inserted into the first connecting hole 221, and the connecting shaft 211 is simultaneously inserted into the second connecting hole 222 and the third connecting hole 124 to lock the ear clip rod 120 to the rotating shaft sleeve 220, preventing the ear clip rod 120 from rotating freely relative to the rotating shaft sleeve 220. Furthermore, since the locking surface 212 abuts against the stop surface of the rotating shaft sleeve 220, the rotating shaft 210 is prevented from rotating freely. 10 rotates relative to the rotating sleeve 220, while the screw connector is screwed into the locking hole 213 through the threaded hole 223 to completely fix the rotating shaft 210 to the rotating sleeve 220, thereby achieving complete limiting and locking of the ear clip rod 120, the rotating shaft 210 and the rotating sleeve 220, preventing the ear clip rod 120 and the rotating shaft 210 from moving relative to the rotating sleeve 220, so that the rotating shaft 210 can drive the two ear clip rods 120 to swing through the rotating sleeve 220, and control the opening and closing of the two ear clip rods 120.

[0093] Continue, see below Figure 1 and Figure 7As shown, this application also provides a head positioning device 300, which includes an ear clip positioning device 200 as described above. Thus, the head positioning device 300 quickly clamps and fixes the patient's head to maintain its position.

[0094] In one embodiment, see Figure 1 , Figure 5 and Figure 7 As shown, the head positioning device 300 also includes a base 310 and a drive assembly 320. The drive assembly 320 is disposed on the base 310 and is connected to the rotating shaft 210 for transmission. Thus, the drive assembly 320 drives the rotating shaft 210 to rotate, and the two rotating shafts 210 drive the two ear clip rods 120 to swing, controlling the opening and closing of the ear clip rods 120 to adapt to the clamping and fixing of different patient heads, and to facilitate the entry or exit of the patient's head into or out of the receiving space 111.

[0095] Specifically, see Figure 1 , Figure 5 and Figure 7 As shown, the drive assembly 320 includes a threaded shaft 321, two adjusting blocks 322, and two rocker arms 323. The threaded shaft 321 is rotatably mounted on the base 310, and the two adjusting blocks 322 are mounted on the threaded shaft 321 and can slide along the extension direction of the threaded shaft 321. One end of each rocker arm 323 is connected to one of the two rotating shafts 210, and the other end of each rocker arm 323 is engaged with one of the two adjusting blocks 322. During the sliding of the adjusting blocks 322, the adjusting blocks 322 can drive the rocker arms 323 to swing. For example, when the threaded shaft 321 is rotated, the two adjusting blocks 322 slide along the extension direction of the threaded shaft 321. Since one end of the two rocker arms 323 is engaged with the two adjusting blocks 322, the two adjusting blocks 322 can drive the two rocker arms 323 to swing. Since the two rotating shafts 210 are respectively connected to the other end of the two rocker arms 323, the two rocker arms 323 swing and drive the two rotating shafts 210 to rotate. The rotating shafts 210 rotate and drive the ear clip rods 120 to swing, controlling the opening and closing of the two ear clip rods 120 to adapt to the clamping and fixing of different patient heads, and to facilitate the entry or exit of the patient's head into or out of the receiving space 111.

[0096] Further, see Figure 1 , Figure 5 and Figure 8As shown, the threaded shaft 321 has a first thread (not shown) and a second thread (not shown) that mate with two adjusting blocks 322. The first thread and the second thread have opposite directions of rotation, so that when the threaded shaft 321 rotates, the two adjusting blocks 322 screwed onto the threaded shaft 321 can move towards or away from each other, thereby driving the two rocker arms 323 to swing synchronously, and thus controlling the opening and closing of the two ear clamp rods 120. For example, when the two adjusting blocks 322 move in opposite directions, the two adjusting blocks 322 can drive the two rocker arms 323 to swing in opposite directions, and when the two adjusting blocks 322 move in opposite directions, the two rocker arms 323 return to their original positions.

[0097] Further reading Figure 7 and Figure 9 As shown, the adjusting block 322 has an abutment surface 3221, which is a smooth curved surface. The adjusting block 322 includes a body 3223 and a protrusion 3224 extending from the body 3223. The abutment surface 3221 is formed in the transition area connecting the body 3223 and the protrusion 3224. The abutment surface 3221 abuts against the rocker arm 323. When the adjusting block 322 slides relative to the threaded shaft 321, the abutment position of the rocker arm 323 and the abutment surface 3221 changes, and the rocker arm 323 swings to control the opening and closing of the two ear clamp rods 120. Since the contact surface 3221 is a smooth curved surface, a high-pair contact is formed between the adjusting block 322 and the rocker arm 323. On the one hand, the adjusting block 322 and the rocker arm 323 maintain a line-surface contact, which can avoid the adjusting block 322 causing wear to the rocker arm 323 during the swinging process of pushing the rocker arm 323, and improve the swing control accuracy of the rocker arm 323. On the other hand, the adjusting block 322 will not cause any obstruction to the swinging of the rocker arm 323, which can reduce the transmission error between the adjusting block 322 and the rocker arm 323, improve the transmission accuracy between the adjusting block 322 and the rocker arm 323, and further improve the opening and closing control accuracy of the two ear clamp rods 120.

[0098] In one embodiment, see Figure 1 , Figure 7 and Figure 8 As shown, the adjusting block 322 also has a stop surface 3222, which abuts against the base 310. If the adjusting block 322 is positioned below the base 310, the stop surface 3222 abuts against the lower surface of the base 310. The stop surface 3222 abuts against the base 310 to prevent the adjusting block 322 from rotating relative to the threaded shaft 321, allowing the adjusting block 322 to slide only along the extension direction of the threaded shaft 321 to transmit power to the rocker arm 323 and control the opening and closing of the two ear clamp rods 120.

[0099] Furthermore, the drive assembly 320 also includes an elastic element 330, the deformation direction of which is consistent with the extension direction of the threaded shaft 321, and both ends of the elastic element 330 are hooked onto the two rocker arms 323 respectively. In this embodiment, the elastic element 330 is stretched, so that a certain preload pressure is maintained between the rocker arms 323 and the adjusting blocks 322, thereby maintaining the contact state. When the two adjusting blocks 322 move in opposite directions and drive the two rocker arms 323 to swing in opposite directions toward the outside of the base 310, the elastic element 330 can be further stretched. The elastic element 330 will not affect the swing of the rocker arms 323, and when the two adjusting blocks 322 move toward each other, the elastic element 330 can drive the two rocker arms 323 to return to their original position through elastic reset.

[0100] In this embodiment, the elastic element 330 is a tension spring. The two ends of the elastic element 330 are provided with hanging rings. The elastic element 330 is hooked to the two rocker arms 323 through the two hanging rings respectively. The elastic deformation of the elastic element 330 drives the rocker arms 323 to reset.

[0101] Further, see Figure 1 , Figure 7 and Figure 8 As shown, the drive assembly 320 also includes a connecting block 340. The connecting block 340 is fixed to the base 310, and the threaded shaft 321 is rotatably inserted into the connecting block 340 to prevent the threaded shaft 321 from moving relative to the base 310 during rotation. Since the threaded shaft 321 can only rotate, the transmission accuracy of the threaded shaft 321 to the two adjusting blocks 322 is improved, thereby improving the opening and closing control accuracy of the two ear clamp rods 120.

[0102] Furthermore, see Figure 1 , Figure 7 and Figure 8 As shown, the drive assembly 320 includes a knob 350. There may be one knob 350 connected to one end of the threaded shaft 321, or two knobs 350 connected to opposite ends of the threaded shaft 321. In this way, the operator can hold the knob 350 and rotate it to easily drive the threaded shaft 321. If there are two knobs 350 connected to opposite ends of the threaded shaft 321, the operator can hold both knobs 350 with both hands, making the rotation of the threaded shaft 321 less strenuous, especially convenient for women, children, and the elderly.

[0103] Preferably, the outer surface of the knob 350 is textured, such as grooves on the outer surface of the knob 350, thereby increasing the roughness of the outer surface of the knob 350 and making it easier for the operator to hold.

[0104] In one embodiment, see Figure 1 ,Figure 7 and Figure 8 As shown, the base 310 has at least one hollow portion 311, which is a hollow hole or a hollow groove. By providing the hollow portion 311 on the base 310, the manufacturing cost of the head positioning device 300 can be reduced, and the overall weight of the head positioning device 300 can be reduced. The outer edge of the hollow portion 311 or the base 310 extends into a support portion 360 to the front and / or back of the base 310. The support portion 360 and the base 310 are integrally cast parts, which simplifies the forming process of the base 310 and the support portion 360 and improves the connection strength between the support portion 360 and the base 310. The support portion 360 is used to install the threaded shaft 321 and two rotating shafts 210. If a stepped hole is provided on the support portion 360, the threaded shaft 321 and the rotating shafts 210 can be connected to the support portion 360 by being inserted into the stepped hole, which facilitates the installation and fixing of the various components of the drive assembly 320.

[0105] Additionally, see Figure 1 and Figures 1-9 As shown, this application also provides an oral CBCT device, which includes a head positioning device 300 as described above. Thus, the patient can place their chin on the jaw rest 400, and the ear clip positioning mechanism 100 quickly clamps and fixes the patient's head to maintain its position. The oral CBCT device then captures a panoramic view of the oral and maxillofacial region to obtain the patient's oral and maxillofacial image data.

[0106] The following combination ​ The working process of the head positioning device 300 provided in this application is further explained.

[0107] When it is necessary to fix the patient's head, the operator first screws the threaded shaft 321. The rotation of the threaded shaft 321 causes the two adjusting blocks 322 to slide in opposite directions. Then, the two adjusting blocks 322 push the two rocker arms 323 to swing outward toward the base 310. Then, the rocker arms 323 rotate and drive the rotating shaft 210 to rotate. Finally, the rotation of the two rotating shafts 210 drives the first ends 121 of the two ear clip rods 120 to move toward each other until they come into contact with the patient's head. At the same time, the operator adjusts the position of the clamp 140 in three degrees of freedom so that the clamp 140 can fit against and wrap around the outside of the patient's head, thus quickly fixing the patient's head. Conversely, when the patient's head needs to enter or exit the accommodating space 111, the operator first reverses the rotation of the threaded shaft 321. The rotation of the threaded shaft 321 causes the two adjusting blocks 322 to slide towards each other. Then, the elastic element 330, after being stretched, returns to its original position and causes the two rocker arms 323 to swing towards the inside of the base 310. Then, the rocker arms 323 rotate to their original position and cause the rotating shaft 210 to rotate in the opposite direction. Finally, the rotation of the two rotating shafts 210 causes the first ends 121 of the two ear clip rods 120 to move away from each other. The accommodating space 111 increases, allowing the patient's head to enter or exit the accommodating space 111.

[0108] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0109] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An ear clip positioning mechanism, characterized in that, The ear clip positioning mechanism includes: Two ear clip assemblies are spaced apart and have a space for accommodating the patient's head; The ear clip assembly includes an ear clip rod, an adapter sleeve, and a clamp plate. The ear clip rod has a first end, and the first ends of the two ear clip rods can move toward each other or away from each other. The adapter sleeve is connected to the first end of the ear clip rod and can move and rotate along the axial direction of the ear clip rod. The clamp plate is connected to the adapter sleeve and is located in the receiving space. The clamp plate can deflect relative to the adapter sleeve.

2. The ear clip positioning mechanism according to claim 1, characterized in that, The adapter sleeve has an insertion hole that can be inserted into the ear clip rod, and when the adapter sleeve is connected to the ear clip rod, the insertion hole is tightly fitted with the outer circular surface of the ear clip rod.

3. The ear clip positioning mechanism according to claim 2, characterized in that, The adapter sleeve has a deformation hole communicating with the insertion hole, wherein the adapter sleeve is elastic or is a thin-walled component.

4. The ear clip positioning mechanism according to any one of claims 2 or 3, characterized in that, The ear clip rod is provided with a snap-fit ​​groove near the first end, and the adapter sleeve is provided with a snap-fit ​​part. The snap-fit ​​part protrudes from the side wall forming the insertion hole and extends into the insertion hole. When the adapter sleeve is connected to the ear clip rod, the locking part is locked into the locking groove. In the axial direction of the ear clip rod, there is a movement space between the locking part and the locking groove for the adapter sleeve to move. In the circumferential direction of the ear clip rod, there is an active clearance between the locking part and the locking groove for the adapter sleeve to rotate.

5. The ear clip positioning mechanism according to claim 1, characterized in that, The outer circular surface of the adapter sleeve has a protruding adapter shaft, and the clamp is connected to the adapter shaft and can be deflected relative to the adapter shaft.

6. The ear clip positioning mechanism according to claim 5, characterized in that, The clamp has a clamping part and a connecting part. The clamping part is used to clamp and fix the patient's head. The connecting part is provided with an arc-shaped groove. The arc-shaped groove can be engaged with the adapter shaft and can be deflected relative to the adapter shaft.

7. The ear clip positioning mechanism according to claim 6, characterized in that, The adapter shaft is provided with a groove, the groove opening on the outer surface of the adapter shaft, and the connecting part is also provided with a boss, the boss protruding from the side wall forming the arc-shaped groove and extending into the arc-shaped groove; When the arc-shaped groove is engaged with the adapter shaft, the boss is engaged with the groove, and there is a movable gap between the boss and the groove.

8. The ear clip positioning mechanism according to claim 6, characterized in that, There are two adapter shafts and two connecting parts, with the two adapter shafts protruding from opposite sides of the adapter sleeve, and the two connecting parts spaced apart and forming a positioning groove between them to accommodate the adapter sleeve.

9. The ear clip positioning mechanism according to claim 6, characterized in that, The connecting part is elastic or is a thin-walled component; The arc angle formed by the arc groove along its circumference is α, where 180° < α < 360°, and the opening of the arc groove is smaller than the outer diameter of the adapter shaft.

10. The ear clip positioning mechanism according to claim 1, characterized in that, The splint is an arc-shaped component, the thickness of the two sides of the splint is less than the thickness of the middle, and / or, the splint has a flexible component on at least the side that contacts the patient's head.

11. The ear clip positioning mechanism according to claim 1, characterized in that, The adapter sleeve has a snap-fit ​​part, a plug-in hole and two deformation holes. The diameter of the deformation holes is smaller than the diameter of the plug-in hole. The two deformation holes are symmetrically arranged on opposite sides of the plug-in hole, and both deformation holes are connected to the plug-in hole. The snap-fit ​​part protrudes from the side wall forming the plug-in hole. The outer circular surface of the adapter sleeve has two protruding adapter shafts, and the clamping plate has two connecting parts that engage with the two adapter shafts. The adapter sleeve has a centrally symmetrical structure with respect to the axis of the insertion hole.

12. The ear clip positioning mechanism according to claim 11, characterized in that, The adapter shaft is symmetrically provided with two grooves; The connecting part is provided with a boss, which can be movably engaged with any of the grooves of the adapter shaft.

13. An ear clip positioning device, characterized in that, The ear clip positioning device includes: The ear clip positioning mechanism as described in any one of claims 1-12, wherein the ear clip rod has a second end remote from the first end; and Two rotating shafts, the ends of which are respectively connected to the second ends of the two ear clip rods, and the rotation of the two rotating shafts can drive the first ends of the two ear clip rods to move toward each other or away from each other.

14. The ear clip positioning device according to claim 13, characterized in that, The rotating shaft is connected to the second end of the ear clip rod via a rotating shaft sleeve.

15. A head positioning device, characterized in that, The head positioning device includes: The ear clip positioning device as described in any one of claims 13-14.

16. The head positioning device according to claim 15, characterized in that, The head positioning device further includes a base and a drive assembly, the drive assembly being disposed on the base and being connected to the rotating shaft via a transmission. The drive assembly includes a threaded shaft, two adjusting blocks, and two rocker arms. The threaded shaft is rotatably mounted on the base; The two adjustment blocks are disposed on the threaded shaft and are slidable along the extension direction of the threaded shaft; One end of each of the two rocker arms is connected to one of the two rotating shafts, and the other end of each of the two rocker arms is engaged with one of the two adjusting blocks. During the sliding of the adjusting blocks, the adjusting blocks can drive the rocker arms to swing.

17. The head positioning device according to claim 16, characterized in that, The threaded shaft has a first thread and a second thread that mate with the two adjusting blocks, the first thread and the second thread having opposite directions of rotation.

18. The head positioning device according to claim 16, characterized in that, The adjusting block has an abutting surface, which is a smooth curved surface and abuts against the rocker arm; The adjusting block also has a stop surface that abuts against the base to prevent the adjusting block from rotating relative to the threaded shaft.

19. The head positioning device according to claim 16, characterized in that, The drive assembly also includes an elastic element whose deformation direction is consistent with the extension direction of the threaded shaft, and whose two ends are respectively hooked to the two rocker arms.

20. The head positioning device according to claim 16, characterized in that, The drive assembly further includes a connecting block, which is fixed to the base, and the threaded shaft is rotatably inserted into the connecting block.

21. The head positioning device according to claim 16, characterized in that, The base has at least one hollowed-out portion, which is a hollowed-out hole or a hollowed-out groove. A support portion for mounting the threaded shaft and the two rotating shafts extends from the hollowed-out portion or the outer edge of the base to the front and / or back of the base. The support portion and the base are integrally formed castings.

22. A dental CBCT device, characterized in that, The CBCT device includes: The head positioning device as described in any one of claims 15-21.

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