CN212438653U

CN212438653U - Positioning and fixing device for oral CBCT and oral CBCT

Info

Publication number: CN212438653U
Application number: CN202021118116.2U
Authority: CN
Inventors: 徐明峰
Original assignee: Hefei Meyer Optoelectronic Technology Inc
Current assignee: Hefei Meyer Optoelectronic Technology Inc
Priority date: 2020-06-16
Filing date: 2020-06-16
Publication date: 2021-02-02
Anticipated expiration: 2030-06-16

Abstract

The utility model discloses a location fixing device and oral cavity CBCT for oral cavity CBCT, include: the base shell component can move up and down, and is provided with a limit groove; a clamping assembly, the clamping assembly comprising: the screw rod is rotatably arranged on the base shell assembly; the first nut and the second nut are respectively movably arranged in the limiting groove and are respectively in threaded fit with the screw rod; the first clamping plate and the second clamping plate are respectively and rotatably arranged on the base shell assembly; the first connecting rod is rotatably connected with the first nut and the first clamping plate respectively, and the second connecting rod is rotatably connected with the second nut and the second clamping plate respectively; and the positioning component is arranged on the base shell component and can move along the front-back direction, and is positioned between the first clamping plate and the second clamping plate in the horizontal projection plane. According to the utility model discloses a positioning and fixing device, simple structure, easy operation, reliable and stable, strong adaptability.

Description

Positioning and fixing device for oral CBCT and oral CBCT

Technical Field

The utility model relates to an oral cavity CBCT technical field particularly, relates to a location fixing device for oral cavity CBCT and having a location fixing device for oral cavity CBCT's oral cavity CBCT.

Background

In three-in-one (i.e., CT, panoramic, lateral) oral CBCT, both CT and panoramic acquire image data by rotating the X-ray source and X-ray sensor on either side of the C-arm around the patient's head under the skull positioning fixture. In order to obtain an excellent image, the patient's head must remain in the acquisition process, i.e. not moved during the X-ray emission.

On the one hand, it is easy for the patient to remain stationary if the patient feels comfortable, and more likely to move if the patient is uncomfortable or under pressure and unsupported conditions; on the other hand, the cranial positioning fixtures should be as transparent to X-rays as possible so that they do not create artifacts that can reduce the diagnostic effectiveness of the radiographic image, which affects the choice of materials and material thicknesses, such as the choice of non-metallic materials with good transmission, while also ensuring that the cranial positioning fixtures are sufficiently rigid to ensure displacement-free positioning and support of the patient. In addition, the cranial positioning fixture should be able to accommodate any patient from a pediatric patient, adult patient, and therefore need to have a wide degree of freedom of adjustment to accommodate the physiological anatomical dimensions of different patients.

The skull positioning and fixing device in the related art is not firm enough in structure, cannot ensure the frankfurt plane to be horizontal (namely the head is inclined forwards and backwards), and is not supported by the forehead. And some heads have front and back supporting structures, and are not clamped left and right or locked by soft belts, so that the fixing mode has the disadvantages of complex operation and low efficiency, and a patient needs to keep still for a long time.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a positioning and fixing device for oral cavity CBCT, a triangle centre gripping of accurate adjustment and both sides, forehead that is used for oral cavity CBCT's positioning and fixing device can realize the head position, for the patient keeps static stability at the shooting in-process and provides the physics of simple, easy operation to support, multi freedom's adjustment mechanism can adapt to different patient head sizes simultaneously.

The utility model discloses still provide one kind have a location fixing device's oral cavity CBCT for oral cavity CBCT.

According to the utility model discloses a location fixing device for oral cavity CBCT, include: a substrate; the base shell assembly is movably arranged on the substrate along the vertical direction and is provided with a limiting groove; a clamping assembly, the clamping assembly is disposed on the base housing assembly and includes: the screw rod is rotatably arranged on the base shell assembly; the first nut and the second nut are respectively movably arranged in the limiting groove and are respectively in threaded fit with the screw rod so as to convert the rotary motion of the screw rod into the movement of the first nut and the second nut; the first clamping plate and the second clamping plate are respectively and rotatably arranged on the base shell assembly; the two ends of the first connecting rod are respectively and rotatably connected with the first nut and the first clamping plate, and the two ends of the second connecting rod are respectively and rotatably connected with the second nut and the second clamping plate; the positioning assembly is arranged on the base shell assembly and is constructed to be movable along the front-back direction, and the positioning assembly is positioned between the first clamping plate and the second clamping plate in the horizontal projection plane.

According to the utility model discloses a location fixing device for oral cavity CBCT can realize that the three point support of head both sides and forehead is fixed, simultaneously, has three degree of freedom, can adjust the upper and lower height and the forehead every single move angle regulation of head centre gripping width, centre gripping to adapt to different patients' physiological anatomy size.

In addition, the positioning and fixing device for oral cavity CBCT according to the embodiment of the present invention has the following additional technical features:

according to some embodiments of the invention, the clamping assembly further comprises: the first knob and the second knob are respectively connected with two ends of the screw rod.

According to the utility model discloses a some embodiments, first nut with the second nut is equipped with the fitting surface respectively, the fitting surface with the laminating of the inside wall of spacing groove is in order to restrict first nut with the rotation of second nut.

According to some embodiments of the invention, the first and second connecting rods are respectively configured in an outwardly protruding arc shape.

According to some embodiments of the invention, the positioning assembly comprises: the rear surface of the positioning base body is provided with a guide post, and the guide post is movably arranged on the base shell assembly; the adjusting rod of the positioning knob is in threaded fit with the guide column, and a limiting part is arranged between the positioning knob and the base shell assembly to limit the movement of the positioning knob.

In some embodiments of the invention, the base housing assembly is provided with a guide groove, and the guide post is movably fitted in the guide groove.

According to some embodiments of the invention, the base shell assembly comprises: an upper housing; the lower shell is connected with the upper shell and defines a mounting cavity together with the upper shell, one part of the clamping assembly and one part of the positioning assembly are located in the mounting cavity, and the limiting groove is defined by the mounting cavity.

In some embodiments of the present invention, the mounting cavity is configured in a "C" shape, and the lead screw, the first nut, the second nut, the first connecting rod and the second connecting rod are located in the mounting cavity.

In some embodiments of the present invention, the base plate is provided with a guide shaft, the guide shaft extends in an up-down direction, and the upper housing and the lower housing are movably disposed on the guide shaft respectively.

According to the utility model discloses oral cavity CBCT of second aspect embodiment, include according to the utility model discloses a location fixing device for oral cavity CBCT.

According to the utility model discloses oral cavity CBCT utilizes as above a location fixing device for oral cavity CBCT, can carry out the accurate adjustment and carry out the triangle centre gripping of both sides, forehead to the position of head, for the patient keeps static stability at the shooting in-process and provides the physics of simple, easy operation to can adapt to different patient head sizes.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

Fig. 1 is a schematic partial structure diagram of an oral CBCT according to an embodiment of the present invention;

fig. 2 is a perspective view of a positioning fixture for oral CBCT according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a positioning and fixing device for oral CBCT according to an embodiment of the present invention;

fig. 4 is a perspective view of another angle of a positioning fixture for oral CBCT in accordance with an embodiment of the present invention;

fig. 5 is an exploded view of a positioning fixture for oral CBCT in accordance with an embodiment of the present invention;

fig. 6 is a top view of a positioning fixture for oral CBCT according to an embodiment of the present invention;

fig. 7 is a side view of a positioning fixture for oral CBCT according to an embodiment of the present invention;

fig. 8 is a partial cross-sectional view of a positioning fixture for oral CBCT in accordance with an embodiment of the present invention;

fig. 9 is a perspective view of a first nut (second nut) according to an embodiment of the present invention;

fig. 10 is a perspective view of a first splint (second splint) according to an embodiment of the present invention;

fig. 11 is a perspective view of a positioning base according to an embodiment of the present invention;

figure 12 is an exploded view of a base housing assembly according to an embodiment of the present invention;

fig. 13 is a schematic view of an open position of a positioning fixture for oral CBCT in accordance with an embodiment of the present invention;

fig. 14 is a schematic diagram of the operation process of the positioning and fixing device for oral CBCT according to the embodiment of the present invention;

fig. 15 is a schematic view of a clamping position of a positioning fixture for oral CBCT according to an embodiment of the present invention.

Reference numerals:

CBCT1 for oral cavity,

A positioning and fixing device 10 for oral CBCT,

A base plate 100, a guide shaft 101, a fixing tube 102,

The base shell assembly 200, a limiting groove 201, a mounting cavity 202, a guide groove 203, a frontal pillow guide hole 204, a carbon tube guide hole 205, a ball plunger 206, an upper shell 210, an upper receiving groove 211, an upper notch 212, a first upper clamping plate hole 213, a second upper clamping plate hole 214, a lower shell 220, a lower receiving groove 221, a lower notch 222, a first lower clamping plate hole 223, a second lower clamping plate hole 224, a first upper clamping plate hole 204, a second lower clamping plate hole 205, a first lower clamping plate hole 204, a second upper clamping plate hole,

The clamping assembly 300, a mating surface 301, a lead screw 310, a first nut 320, a first link mating groove 321, a second nut 330, a second link mating groove 331, a first clamping plate 340, a first mating groove 341, a first pivot hole 342, a second clamping plate 350, a second mating groove 351, a second pivot hole 352, a first connecting rod 360, a second connecting rod 370, a first knob 380, a second knob 390, a first nut 330, a second connecting rod mating groove 331, a first clamping plate 340, a first clamping plate 341, a second clamping plate 350,

positioning assembly 400, positioning base 410, guide column 411, soft pad 412, cylindrical nut 413, positioning knob 420, adjusting rod 421, limiting piece 422,

Chin positioning mechanism 500.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

A positioning fixture 10 for oral CBCT according to an embodiment of the first aspect of the present invention is described below with reference to the accompanying drawings.

As shown in fig. 1-15, a positioning and fixing device 10 for oral CBCT according to an embodiment of the present invention includes: a base plate 100, a base housing assembly 200, a clamping assembly 300, and a positioning assembly 400.

Specifically, the base housing assembly 200 is provided to the base plate 100 to be movable in the up-down direction for height adjustment. The base housing assembly 200 is provided with a limit groove 201. The clamping assembly 300 is disposed on the base housing assembly 200, and the clamping assembly 300 includes: a screw 310, a first nut 320, a second nut 330, a first clamping plate 340, a second clamping plate 350, a first link 360 and a second link 370. The lead screw 310 is rotatably provided to the base housing assembly 200. The first nut 320 and the second nut 330 are movably arranged in the limiting groove 201 respectively, the first nut 320 and the second nut 330 are in threaded fit with the lead screw 310 respectively, the thread pitches of the first nut 320 and the second nut 330 are the same, and the rotation directions of the first nut 320 and the second nut 330 are opposite, so that the rotation motion of the lead screw 310 is converted into the relative or back synchronous motion of the first nut 320 and the second nut 330. The first and

second clamping plates

340 and 350 are rotatably provided to the base housing assembly 200, respectively. The first link 360 has both ends rotatably connected to the first nut 320 and the first clamp plate 340, respectively, and the second link 370 has both ends rotatably connected to the second nut 330 and the second clamp plate 350, respectively.

The positioning member 400 is disposed on the base housing member 200, and the positioning member 400 is configured to be movable in the front-rear direction, and the positioning member 400 is located between the first clamping plate 340 and the second clamping plate 350 in the horizontal projection plane. Thus, the positioning assembly 400 is used for adjusting the pitch angle of the forehead, and the clamping assembly 300 is used for positioning the two sides of the head.

According to the utility model discloses a fix a position fixing device 10 for oral cavity CBCT can realize that the three point support of head both sides and forehead is fixed, simultaneously, has three degree of freedom, can adjust the upper and lower height and the forehead every single move angle regulation of head centre gripping width, centre gripping to adapt to different patients' physiological anatomy size.

According to some embodiments of the present invention, as shown in fig. 2-6, the clamping assembly 300 further comprises: the first knob 380 and the second knob 390, and the first knob 380 and the second knob 390 are respectively connected to two ends of the screw rod 310, so that the screw rod 310 can be rotated by rotating the first knob 380 or the second knob 390, and the operation is convenient and the stability is good.

According to some embodiments of the present invention, as shown in fig. 9 and 13, the first nut 320 and the second nut 330 are respectively provided with a fitting surface 301, and the fitting surface 301 is attached to the inner side wall of the spacing groove 201 to limit the rotation of the first nut 320 and the second nut 330.

According to some embodiments of the present invention, as shown in fig. 5 and 12, the base housing assembly 200 includes: an upper case 210 and a lower case 220. The lower housing 220 is connected to the upper housing 210, the lower housing 220 and the upper housing 210 together define a mounting cavity 202, a portion of the clamping assembly 300 and a portion of the positioning assembly 400 are located in the mounting cavity 202, and the limiting groove 201 is defined by the mounting cavity 202. For example, the upper case 210 is provided with an upper receiving groove 211 opened downward, the lower case 220 is provided with a lower receiving groove 221 opened upward, and the mounting cavity 202 is formed by the upper receiving groove 211 and the lower receiving groove 221 together.

In some embodiments of the present invention, as shown in fig. 13-15, the mounting cavity 202 is configured in a "C" shape, and the lead screw 310, the first nut 320, the second nut 330, the first link 360, and the second link 370 are located in the mounting cavity 202. For example, the upper shell 210 is provided with an upper notch 212, the lower shell 220 is provided with a lower notch 222, the upper notch 212 and the lower notch 222 together define a shaft hole, and the screw rod 310 extends out of the mounting cavity 202 from the shaft hole to be connected with the first knob 380 and the second knob 390; a portion of the first nut 320 is located in the upper receiving groove 211 and another portion is located in the lower receiving groove 221, and a portion of the second nut 330 is located in the upper receiving groove 211 and another portion is located in the lower receiving groove 221.

In some embodiments of the present invention, as shown in fig. 4 and 5, the guide shaft 101 is disposed on the substrate 100, the guide shaft 101 extends in the up-down direction, and the upper casing 210 and the lower casing 220 are movably disposed on the guide shaft 101 respectively. For example, the guide shafts 101 pass through the upper and

lower cases

210 and 220, respectively, the guide shafts 101 are two, and the two guide shafts 101 are disposed adjacent to the first and

second nuts

320 and 330, respectively, so that the operation is more smooth and smooth, and the reliability is higher.

According to some embodiments of the present invention, as shown in fig. 13-15, the first link 360 and the second link 370 are respectively configured in an outwardly protruding arc shape. By designing the first link 360 and the second link 370 in a curved shape, the range of the swing thereof can be ensured within the space allowed by the installation cavity 202.

According to some embodiments of the present invention, as shown in fig. 5, 11 and 13, the positioning assembly 400 includes: a positioning base 410 and a positioning knob 420. The rear surface of the positioning base 410 is provided with a guide post 411, and the guide post 411 is movably provided to the base housing assembly 200. An adjusting rod 421 of the positioning knob 420 is in threaded fit with the guiding column 411, and a limiting member 422 is disposed between the positioning knob 420 and the base housing assembly 200 to limit the movement of the positioning knob 420. For example, two guiding posts 411 are provided, the two guiding posts 411 are respectively inserted into the upper housing 210 and the lower housing 220, the adjusting rod 421 of the positioning knob 420 can be matched with the guiding posts 411 on the upper housing 210 and also matched with the guiding posts 411 on the lower housing 220, the limiting member 422 is a circular gasket sleeved on the adjusting rod 421, taking the matching of the adjusting rod 421 and the guiding posts 411 on the upper housing 210 as an example, the rear end surface of the circular gasket abuts against the inner side wall of the upper receiving groove 211, and the front end surface of the positioning knob 420 abuts against the outer surface of the upper housing 210, so as to limit the movement of the positioning knob 420 along the front-back direction.

In some embodiments of the present invention, as shown in fig. 12-15, the base housing assembly 200 is provided with a guide slot 203, and the guide post 411 is movably fitted in the guide slot 203. For example, the guide grooves 203 are respectively arranged in the upper accommodation groove 211 and the lower accommodation groove 221, so that the positioning base body 410 can be guided to move back and forth smoothly and accurately, the guiding performance is good, and the operation is facilitated.

According to some embodiments of the present invention, as shown in fig. 2, the positioning and fixing device 10 for oral CBCT further comprises: the chin positioning mechanism 500, the chin positioning mechanism 500 is mounted on the base plate 100, and the chin positioning mechanism 500 is located below the base housing assembly 200. The chin positioning mechanism 500 mainly provides head support, the height of which is adjustable. Wherein the cross-lingual slots of the chin positioning mechanism 500 provide occlusal positioning of the upper and lower teeth.

A positioning fixture 10 for oral CBCT in accordance with an embodiment of the present invention is described in detail below with reference to the accompanying drawings.

As shown in fig. 1, when a patient takes CT and panorama, the positioning fixing device 10 for oral CBCT mounted on the detection table is needed to ensure that the patient keeps stable and still during the taking process. In this embodiment, the positioning fixture 10 for oral CBCT mainly realizes three degrees of freedom, i.e., gripping on both sides of the skull, adjustment of the forehead forward and backward, and up and down movement of the positioning portion.

As shown in fig. 13-15, the screw rod 310 is symmetrically and horizontally arranged, one of the first knob 380 and the second knob 390 is left-handed and the other is right-handed, correspondingly, one of the first nut 320 and the second nut 330 is left-handed and the other is right-handed, the left-handed nut and the right-handed nut are respectively matched with the left-handed thread and the right-handed thread of the screw rod 310, and meanwhile, matching surfaces 301 are respectively arranged on two sides of the left-handed nut and the right-handed nut to be matched with the edge surfaces of the upper shell 210 and the lower shell 220, so that the rotation of the left-handed nut and the right-handed nut is limited and can only move. Since the left-hand thread and the right-hand thread of the lead screw 310 are symmetrical, the left-hand nut and the right-hand nut are also symmetrically distributed relative to the central plane.

As shown in fig. 5, 9, 10, 13-15, one end of the first arc-shaped link 360 is disposed in the first link fitting groove 321 of the first nut 320 and is rotatably fitted to the first nut 320 via a pin, wherein the pin and the pin hole of the first nut 320 can be in transition or interference fit, and the pin and the hole of the one end of the first link 360 are in clearance fit, so that the first link 360 can rotate relative to the pin, and the pin cannot fall off; the other end of the first connecting rod 360 is arranged in the first matching groove 341 in the middle of the first clamping plate 340 and is matched with the pin shaft hole on the first clamping plate 340 by the pin shaft, wherein the pin shaft and the pin shaft hole of the first clamping plate 340 can be in transition or interference fit, and the pin shaft and the hole of the other end of the first connecting rod 360 are in clearance fit, so that the first connecting rod 360 can rotate relative to the pin shaft, and the pin shaft can not fall off at the same time.

Similarly, one end of the second link 370 having an arc shape is disposed in the second link fitting groove 331 of the second nut 330 and is rotatably fitted with the second nut 330 via a pin, wherein the pin may be in transition or interference fit with a pin hole of the second nut 330, and the pin is in clearance fit with a hole of the one end of the second link 370, so that the second link 370 may rotate relative to the pin, and the pin may not fall; the other end of the second link 370 is disposed in the second fitting groove 351 in the middle of the second clamping plate 350 and is fitted to the pin hole of the second clamping plate 350 by a pin, wherein the pin and the pin hole of the second clamping plate 350 can be in transition or interference fit, and the pin and the hole of the other end of the second link 370 are in clearance fit, so that the second link 370 can rotate relative to the pin, and the pin cannot fall off.

The first rotating shaft hole 342 of the first clamping plate 340 is matched with the first upper clamping plate hole 213 of the upper shell 210 and the first lower clamping plate hole 223 of the lower shell 220 through a pin shaft to form a rotating hinge; the second rotation shaft hole 352 of the second clamping plate 350 is matched with the second upper clamping plate hole 214 of the upper shell 210 and the second lower clamping plate hole 224 of the lower shell 220 through a pin shaft to form a rotation hinge. The left end and the right end of the screw rod 310 are provided with a first knob 380 and a second knob 390, when the first knob 380 or the second knob 390 is rotated, the left-handed nut and the right-handed nut simultaneously move back to or relatively to each other and drive the first connecting rod 360 and the second connecting rod 370 to swing, the first connecting rod 360 simultaneously drives the first clamping plate 340 to rotate around the first rotating shaft hole 342 on the first clamping plate 340, and the second connecting rod 370 simultaneously drives the second clamping plate 350 to rotate around the second rotating shaft hole 352 on the second clamping plate 350, so that the first clamping plate 340 and the second clamping plate 350 are opened or closed (the clamping process is shown in fig. 13-15). The first link 360 and the second link 370 are respectively formed in a curved shape to ensure a swing range within a space allowed by the upper receiving groove 211 and the lower receiving groove 221.

From the open state, as shown in fig. 13, the patient enters a position where the both sides of the head are held, where the opening width of the upper shell 210 and the opening width of the lower shell 220 should be respectively larger than 180mm, and the maximum width of the skull of the human body does not generally exceed this dimension.

The middle of the upper shell 210 and the lower shell 220 is respectively provided with a frontal pillow guide hole 204, and two guide columns 411 of the positioning base 410 are respectively matched with the frontal pillow guide hole to form a front-back movement guide. A soft cushion 412 is provided on the positioning base 410 to reduce the pressure on the forehead contact. A cylindrical nut 413 is arranged in the guide column 411, a positioning knob 420 with an adjusting rod 421 for front and back positioning passes through a hole on the end face of the upper shell 210 or the lower shell 220 to be matched with the cylindrical nut 413, and meanwhile, the cylindrical nut is clamped between the end faces of the upper shell 210 or the lower shell 220 through a circular gasket to enable the cylindrical nut to only rotate. Thus, by rotating the positioning knob 420, the frontal pillow can move forward and backward. Thus, by adjusting the forward and backward movement of the forehead pillow, after the chin of the patient is supported, the patient can be reliably supported and can be more easily kept still by adjusting the forward and backward pitch angle of the patient to be at the correct shooting position. In addition, the rotation of the first clamping plate 340 and the second clamping plate 350 and the fore-and-aft adjustment of the forehead pillow are realized through threads, and can be self-locked.

Since the carbon fiber pipe has a small density, good rigidity, is not easily deformed, and has good X-ray penetration, the guide shaft 101 may be a carbon fiber pipe. The left and right sides of the upper shell 210 and the lower shell 220 are respectively provided with a carbon tube guide hole 205, the carbon tube guide hole 205 is in clearance fit with the carbon fiber tube, meanwhile, the threaded hole on the side is matched with the ball plunger 206, and the carbon fiber tube is elastically extruded by the ball of the ball plunger 206 to enable the base shell assembly 200 to stay at any height. Wherein the carbon fiber pipe may cooperate with the base plate 100 through the fixing pipe 102 to form a complete skull fixation device. According to different head lengths, the operator can freely adjust the height to ensure that the patient is in a reliable and stable supporting state.

The oral cavity CBCT1 according to an embodiment of the second aspect of the present invention comprises a positioning and fixing device 10 for oral cavity CBCT according to an embodiment of the first aspect of the present invention.

According to the utility model discloses oral cavity CBCT1 utilizes as above a location fixing device 10 for oral cavity CBCT, can carry out accurate adjustment and carry out the triangle centre gripping of both sides, forehead to the position of the head, for the patient keeps static stability at the shooting in-process and provides the physics of simple, easy operation to can adapt to different patient head sizes.

Other configurations and operations of the oral CBCT1 according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of 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, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, "first feature" and "second feature" may include one or more of the features, and the first feature may be "on" or "under" the second feature, and may include the first and second features being in direct contact, or the first and second features being in contact not directly but via another feature therebetween. The first feature being "on," "over" and "above" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature.

It is to be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through the communication between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "a specific embodiment," "an example" or "some examples" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A positioning fixture for oral CBCT, comprising:

a substrate;

the base shell assembly is movably arranged on the substrate along the vertical direction and is provided with a limiting groove;

a clamping assembly, the clamping assembly is disposed on the base housing assembly and includes:

the screw rod is rotatably arranged on the base shell assembly;

the first nut and the second nut are respectively movably arranged in the limiting groove and are respectively in threaded fit with the screw rod so as to convert the rotary motion of the screw rod into the movement of the first nut and the second nut;

the first clamping plate and the second clamping plate are respectively and rotatably arranged on the base shell assembly;

the two ends of the first connecting rod are respectively and rotatably connected with the first nut and the first clamping plate, and the two ends of the second connecting rod are respectively and rotatably connected with the second nut and the second clamping plate;

the positioning assembly is arranged on the base shell assembly and is constructed to be movable along the front-back direction, and the positioning assembly is positioned between the first clamping plate and the second clamping plate in the horizontal projection plane.

2. The positioning fixture for oral CBCT according to claim 1, wherein said clamping assembly further comprises:

the first knob and the second knob are respectively connected with two ends of the screw rod.

3. The positioning and fixing device for the oral CBCT as recited in claim 1, wherein the first nut and the second nut are respectively provided with a matching surface, and the matching surfaces are attached to the inner side walls of the limiting grooves to limit the rotation of the first nut and the second nut.

4. The positioning fixture for oral CBCT according to claim 1, wherein said first link and said second link are each configured in an outwardly protruding arc.

5. The positioning fixture for oral CBCT according to claim 1, wherein said positioning assembly comprises:

the rear surface of the positioning base body is provided with a guide post, and the guide post is movably arranged on the base shell assembly;

the adjusting rod of the positioning knob is in threaded fit with the guide column, and a limiting part is arranged between the positioning knob and the base shell assembly to limit the movement of the positioning knob.

6. The positioning fixture for oral CBCT as claimed in claim 5, wherein the base housing assembly is provided with a guide slot in which the guide post is movably fitted.

7. The positioning fixture for oral CBCT according to any of claims 1-6, wherein said base housing assembly comprises:

an upper housing;

the lower shell is connected with the upper shell and defines a mounting cavity together with the upper shell, one part of the clamping assembly and one part of the positioning assembly are located in the mounting cavity, and the limiting groove is defined by the mounting cavity.

8. The positioning fixture for oral CBCT as claimed in claim 7, wherein said mounting cavity is configured as a "C" shape, said lead screw, said first nut, said second nut, said first link and said second link being located within said mounting cavity.

9. The positioning and fixing device for the oral CBCT according to claim 7, wherein a guide shaft is provided on the base plate, the guide shaft extends in an up-and-down direction, and the upper casing and the lower casing are movably provided on the guide shaft respectively.

10. An oral CBCT comprising a positioning fixture for an oral CBCT according to any of claims 1-9.