Multi-section adjustable calibration device

Abstract

The utility model provides a multi-section adjustable calibration device. The multi-section adjustable calibration device comprises a reference plate, a clamping part and a connecting part, a plurality of reflective identification points are arranged on the reference plate; the clamping part comprises a first clamping plate, a connecting plate and a second clamping plate, the first clamping plate and the second clamping plate are oppositely arranged, a clamping space is formed between the first clamping plate and the second clamping plate, and a plurality of CT reference spheres are arranged in the connecting plate; the connecting part comprises a first joint assembly, a second joint assembly and a third joint assembly, the first joint assembly is connected with the reference plate, and the third joint assembly is connected with the clamping part. The reference plate and the clamping part are connected through the first joint assembly, the second joint assembly and the third joint assembly, angle adjustment is carried out in the using process through the matched connection relation between the joint assemblies, adaptive angle adjustment can be conveniently carried out according to application scenes, and the beneficial effects of being easy to mount and dismount and the like are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, and particularly to a multi-section adjustable calibration device for auxiliary calibration and positioning in the process of dental implantation. Background Art

[0002] Dental implants are an important method for treating tooth loss. In order to achieve higher surgical accuracy and better treatment results, implant navigation systems are often used in clinics to determine the real-time position of the patient and the implant mobile phone based on an optical locator and a reference plate, so as to implement the dental implant surgery according to the preset implant plan. Compared with pure manual operation, the use of implant navigation systems can undoubtedly achieve higher accuracy and better ensure implant results.

[0003] Before using the implant navigation system to perform surgery, the implant navigation system needs to be calibrated first. The CT scanning coordinate system is determined by collecting the CT signal of the CT reference sphere, and the visual scanning coordinate system is determined by collecting the light signal reflected from the reflective marking point on the reference plate. After completing the above steps, a coordinate conversion relationship is established between the CT scanning coordinate system and the visual scanning coordinate system, so that accurate navigation can be performed during the implant surgery.

[0004] The calibration device generally includes a clamping part and a reference plate. The CT reference sphere is fixedly arranged on the clamping part, and the reflective marking point is fixedly arranged on the reference plate. In the prior art, the clamping part and the reference plate of the calibration device are an integrated structure, and the two are fixedly connected to each other. Such a structure has problems such as difficult disassembly after use and inconvenient angle adjustment during use. Summary of the invention

[0005] The technical problem to be solved by the utility model is that, in view of the above-mentioned defects of the prior art, a multi-stage adjustable calibration device is provided, in which a multi-stage adjustable connection structure is arranged between the clamping part and the reference plate, which has the advantages of easy angle adjustment and easy installation and disassembly.

[0006] The technical solution adopted by the utility model to solve the technical problem is as follows:

[0007] A multi-stage adjustable calibration device, comprising:

[0008] A reference plate, wherein a plurality of reflective marking points are arranged on the reference plate;

[0009] A clamping portion, wherein the clamping portion comprises a first clamping plate, a connecting plate and a second clamping plate, wherein the first clamping plate and the second clamping plate are arranged opposite to each other, a clamping space is formed between the first clamping plate and the second clamping plate, the first clamping plate is connected to the second clamping plate through the connecting plate to form an integral structure, and a plurality of CT reference spheres are arranged in the connecting plate;

[0010] A connecting part, the connecting part includes a first joint component, a second joint component and a third joint component, the first joint component is connected to the reference plate, the third joint component is connected to the clamping part, the first joint component and the second joint component are detachably connected, and the second joint component and the third joint component are detachably connected.

[0011] Compared with the prior art, the beneficial effects of the present technical solution are as follows: the reference plate and the clamping part are connected by the first joint assembly, the second joint assembly and the third joint assembly, and the angle is adjusted during use by utilizing the matching connection relationship between the joint assemblies, which facilitates adaptive angle adjustment according to the application scenario and has the advantages of easy installation and disassembly.

[0012] Further, the first joint assembly, the second joint assembly and the third joint assembly are respectively provided with a first joint connecting member and a second joint connecting member;

[0013] The first joint connection member includes a circular base plate and a plurality of first angle adjustment teeth disposed on the circular base plate, wherein the first angle adjustment teeth are arranged in a circular shape;

[0014] The second joint connection member includes a circular base plate and a circular sleeve, wherein the circular base plate is arranged at one end of the circular sleeve, and the other end of the circular sleeve is provided with a plurality of second angle adjustment teeth, and the second angle adjustment teeth are arranged in a circular shape;

[0015] A connecting protrusion is provided on the circular base plate of the first joint connecting member, and the connecting protrusion extends toward the second joint connecting member. A connecting outer sleeve is provided in the circular sleeve on the second joint connecting member, and the opening of the connecting outer sleeve faces the first joint connecting member.

[0016] In the first joint assembly, the second joint assembly or the third joint assembly, when the first joint connector and the second joint connector are fixed to each other, the connecting protrusion is nested in the connecting outer sleeve, and the first angle adjustment tooth and the second angle adjustment tooth are engaged with each other.

[0017] The beneficial effect of adopting the above scheme is: a joint assembly is formed by the first joint connector and the second joint connector, so that the angle of each joint assembly can be adjusted based on the matching connection relationship between the first joint connector and the second joint connector, and six structures can be adjusted between the first joint assembly, the second joint assembly and the third joint assembly, so that the device has the advantages of simple structure and a large adjustment range.

[0018] Furthermore, the circular sleeve on the first joint assembly and the reference plate are an integrally formed structure, and the circular base plate on the third joint assembly and the clamping portion are an integrally formed structure;

[0019] The circular base plate on the first joint component and the circular sleeve on the second joint component are an integrally formed structure, and the circular base plate on the second joint component and the circular sleeve on the third joint component are an integrally formed structure;

[0020] The axis of the circular sleeve on the first joint component is perpendicular to the axis of the circular sleeve on the second joint component, and the axis of the circular sleeve on the third joint component is perpendicular to the axis of the circular sleeve on the second joint component.

[0021] The beneficial effect of adopting the above scheme is: the above special structural setting makes the connection between the first joint assembly, the second joint assembly and the third joint assembly more secure, and can ensure that the axes of the circular sleeves between the first joint assembly, the second joint assembly and the third joint assembly are perpendicular to each other, greatly expanding the adjustable angle range.

[0022] Further, the connecting protrusion is provided with an internal threaded hole, the second joint connecting member is provided with a connecting bolt, the connecting bolt comprises a bolt driving cap and a bolt connecting column, and the bolt connecting column is provided with an external threaded portion;

[0023] When the first joint connector and the second joint connector are fixedly connected, the connecting protrusion is nested in the connecting outer sleeve, and the connecting bolt passes through the circular bottom plate on the second joint connector and is fixedly connected to the connecting protrusion through the cooperation of the external threaded portion and the internal threaded hole.

[0024] The beneficial effect of adopting the above scheme is: in any one of the first joint assembly, the second joint assembly and the third joint assembly, when the first joint connecting part and the second joint connecting part need to be fixedly connected together, the first joint connecting part and the second joint connecting part can be locked by threading the bolt connecting column on the connecting bolt with the internal threaded hole on the connecting protrusion, thereby forming a joint assembly with a fixed structure.

[0025] Further, the bolt driving cap is a circular structure, and the outer edge of the bolt driving cap is provided with anti-slip stripes;

[0026] The bolt driving cap is provided with a driving recessed portion, the driving recessed portion is located at the central position of the bolt driving cap, and the driving recessed portion is located at the opposite side of the bolt connection column.

[0027] The beneficial effects of the above solution are: anti-slip stripes are provided on the outer edge of the bolt driving cap, which is convenient for pre-tightening by hand during pre-positioning; a driving recess is provided on the bolt driving cap, which can be inserted into the driving recess with the help of an external tool after the pre-positioning is completed, thereby achieving complete locking. Specifically, the driving recess is a hexagonal recess.

[0028] Furthermore, a connecting through hole is opened on the circular bottom plate, and a connecting recess is formed outside the connecting through hole; the connecting bolt passes through the connecting through hole on the circular bottom plate and is fixedly connected to the connecting protrusion through the cooperation of the external thread part and the internal thread hole, and the bolt driving cap is buried in the connecting recess.

[0029] The beneficial effect of adopting the above scheme is that a connection recess is formed outside the connection through hole. When the internal threaded hole on the bolt connection column and the connection protrusion is completely locked, the bolt drive cap is completely buried in the connection recess to prevent the bolt drive cap from being exposed and affecting the operation.

[0030] Furthermore, the connecting bolts are an integrally formed metal structure.

[0031] The beneficial effect of adopting the above solution is that the connecting bolts are set as an integrally formed metal structure, which has the advantages of simple structure, convenient manufacturing, etc., and is easy to be recycled and reused.

[0032] Furthermore, the reference plate is a plate-like structure, and a plurality of positioning recesses are provided on the reference plate. Reflective stickers are attached to the positioning recesses, and the reflective stickers are attached and fixed to the positioning recesses to form the reflective marking points.

[0033] The beneficial effect of adopting the above solution is that by attaching a reflective sticker to the positioning recessed portion to form a reflective marking point, a real-time optical positioning function can be achieved through a simple structure.

[0034] Furthermore, the reference plate, the first clamping plate, the second clamping plate and the connecting plate are plastic structures, and the CT reference sphere is a stainless steel sphere or a ceramic sphere.

[0035] The beneficial effect of adopting the above scheme is that using a stainless steel sphere or a ceramic sphere as a CT reference sphere can make the difference between the density of the CT reference sphere and the density of the surrounding material larger, which is convenient for improving the CT scanning imaging effect.

[0036] Furthermore, the first joint assembly is connected to the reference plate via a first connecting rod, and the third joint assembly is connected to the clamping portion via a second connecting rod.

[0037] The beneficial effect of adopting the above solution is that the first connecting rod and the second connecting rod are provided, so that the overall structure of the device can be adjusted by adjusting the length and shape of the first connecting rod and the second connecting rod during the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is an overall schematic diagram of the multi-stage adjustable calibration device of the utility model.

[0039] Figure 2 It is an exploded schematic diagram of the multi-stage adjustable calibration device of the utility model.

[0040] Figure 3 It is a schematic diagram of the first joint connecting member and the second joint connecting member in the multi-stage adjustable calibration device of the utility model.

[0041] Figure 4 It is a schematic diagram of the middle connecting bolt in the multi-stage adjustable calibration device of the utility model.

[0042] In the figure, the components represented by the reference numerals are as follows:

[0043] Reference plate 1, clamping part 2, first joint assembly 3, second joint assembly 4, third joint assembly 5, first connecting rod 6, second connecting rod 7, first joint connecting member 8, second joint connecting member 9;

[0044] Positioning recess 101;

[0045] A first clamping plate 201, a connecting plate 202, and a second clamping plate 203;

[0046] A circular base plate 801, a first angle adjustment tooth 802, and a connecting protrusion 803;

[0047] Circular bottom plate 901 , circular sleeve 902 , second angle adjustment teeth 903 , connecting bolts 904 , bolt driving caps 905 , bolt connecting columns 906 , driving recesses 907 , and connecting recesses 908 . Implementation

[0048] In order to make the purpose, technical solution and advantages of the utility model clearer and more specific, the utility model is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0049] In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "center", "upper", "lower", "front", "back", "left", "right", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0050] In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two components. When a component is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other component or there can also be a central component. When a component is considered to be "connected" to another element, it can be directly connected to the other element or there can be a central element at the same time. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0051] Before using the implant navigation system to perform surgery, the implant navigation system needs to be calibrated first. The CT scanning coordinate system is determined by collecting the CT signal of the CT reference sphere, and the visual scanning coordinate system is determined by collecting the light signal reflected from the reflective marking point on the reference plate. After completing the above steps, a coordinate conversion relationship is established between the CT scanning coordinate system and the visual scanning coordinate system, so that accurate navigation can be performed during the implant surgery.

[0052] The calibration device generally includes a clamping part and a reference plate. The CT reference sphere is fixedly arranged on the clamping part, and the reflective marking point is fixedly arranged on the reference plate. In the prior art, the clamping part and the reference plate of the calibration device are an integrated structure, and the two are fixedly connected to each other. Such a structure has problems such as difficult disassembly after use and inconvenient angle adjustment during use.

[0053] like Figure 1 and Figure 2 As shown, in order to solve the above problems, the utility model provides a multi-stage adjustable calibration device, including a reference plate 1, a clamping part 2 and a connecting part, wherein the reference plate 1 is used to determine the real-time position of the patient and the implant mobile phone with an optical locator, the clamping part 2 is used to clamp and fix on the patient's teeth and cooperate with a CT scanner to determine the CT image, and the connecting part is used to connect and fix the reference plate 1 and the clamping part 2 together in a detachable and adjustable manner.

[0054] The reference plate 1 is provided with a plurality of reflective marking points; the clamping portion 2 comprises a first clamping plate 201, a second clamping plate 203 and a connecting plate 202, the first clamping plate 201 and the second clamping plate 203 are arranged opposite to each other, a clamping space is formed between the first clamping plate 201 and the second clamping plate 203, the first clamping plate 201 is connected to the second clamping plate 203 through the connecting plate 202 to form an integral structure, and a plurality of CT reference spheres are arranged in the connecting plate 202; the connecting portion comprises a first joint component 3, a second joint component 4 and a third joint component 5, the first joint component 3 is connected to the reference plate 1, the third joint component 5 is connected to the clamping portion 2, the first joint component 3 and the second joint component 4 are detachably connected, and the second joint component 4 and the third joint component 5 are detachably connected.

[0055] When in use, first determine the target relative position between the clamping part 2 and the reference plate 1 according to the patient's oral condition, then make corresponding adjustments through the first joint assembly 3, the second joint assembly 4 and the third joint assembly 5 according to the target relative position, and then lock the first joint assembly 3, the second joint assembly 4 and the third joint assembly 5 one by one after the adjustment is completed, so that the relative position between the clamping part 2 and the reference plate 1 is fixed. At this time, the device can be in the optimal angle state under the patient's oral condition.

[0056] Based on the above structure, the reference plate 1 and the clamping part 2 are connected by the first joint component 3, the second joint component 4 and the third joint component 5. The angle is adjusted during use by utilizing the matching connection relationship between the joint components, which facilitates adaptive angle adjustment according to the application scenario and has the advantages of easy installation and disassembly.

[0057] In the present technical solution, the first joint assembly 3, the second joint assembly 4 and the third joint assembly 5 are similar in structure, and the first joint assembly 3, the second joint assembly 4 and the third joint assembly 5 are respectively provided with a first joint connector 8 and a second joint connector 9. The so-called similar structure means that the first joint assembly 3 is provided with a first joint connector 8 and a second joint connector 9, the second joint assembly 4 is provided with a first joint connector 8 and a second joint connector 9, and the third joint assembly 5 is provided with a first joint connector 8 and a second joint connector 9. It should be noted that the first joint connector 8 in the first joint assembly 3 and the first joint connector 8 in the second joint assembly 4 are not the same structure, but only a similar structure. It can be understood that bolts for connection and fixing are provided on the structures of the first joint assembly 3, the second joint assembly 4 and the third joint assembly 5, but the bolts on the structures of the first joint assembly 3, the second joint assembly 4 and the third joint assembly 5 are different bolts.

[0058] like Figure 3 As shown, specifically, the first joint connecting member 8 includes a circular base plate 801 and a plurality of first angle adjustment teeth 802 arranged on the circular base plate 801, and the first angle adjustment teeth 802 are arranged in a circular shape; the second joint connecting member 9 includes a circular bottom plate 901 and a circular sleeve 902, the circular bottom plate 901 is arranged at one end of the circular sleeve 902, and a plurality of second angle adjustment teeth 903 are arranged at the other end of the circular sleeve 902, and the second angle adjustment teeth 903 are arranged in a circular shape; a connecting protrusion 803 is arranged on the circular base plate 801 of the first joint connecting member 8, and the connecting protrusion 803 extends toward the second joint connecting member 9, and a connecting outer sleeve is arranged in the circular sleeve 902 on the second joint connecting member 9, and the connecting outer sleeve opening faces the first joint connecting member 8.

[0059] In the first joint assembly 3, the second joint assembly 4 or the third joint assembly 5, when the first joint connector 8 and the second joint connector 9 are fixed to each other, the connection protrusion 803 is nested in the connection outer sleeve, and the first angle adjustment tooth 802 and the second angle adjustment tooth 903 are engaged with each other. During use, the first joint connector 8 and the second joint connector 9 can be combined into a whole by nesting the connection protrusion 803 in the connection outer sleeve and then further controlling the first angle adjustment tooth 802 and the second angle adjustment tooth 903 to engage with each other.

[0060] Based on the above structure, a joint assembly is formed by the first joint connector 8 and the second joint connector 9, so that the angle of each joint assembly can be adjusted based on the matching connection relationship between the first joint connector 8 and the second joint connector 9. Six structures can be adjusted between the first joint assembly 3, the second joint assembly 4 and the third joint assembly 5, so that the device has the advantages of simple structure and large adjustment range.

[0061] Combination Figure 1 and Figure 2 It can be seen that the circular sleeve 902 on the first joint component 3 is an integrally formed structure with the reference plate 1, and the circular substrate 801 on the third joint component 5 is an integrally formed structure with the clamping portion 2; the circular substrate 801 on the first joint component 3 and the circular sleeve 902 on the second joint component 4 are an integrally formed structure, and the circular substrate 801 on the second joint component 4 and the circular sleeve 902 on the third joint component 5 are an integrally formed structure; the axis of the circular sleeve 902 on the first joint component 3 is perpendicular to the axis of the circular sleeve 902 on the second joint component 4, and the axis of the circular sleeve 902 on the third joint component 5 is perpendicular to the axis of the circular sleeve 902 on the second joint component 4.

[0062] In the above structure, the first joint component 3, the second joint component 4 and the third joint component 5 are not independent entities. From the reference plate 1 to the first joint component 3, the second joint component 4 and the third joint component 5 and then to the clamping part 2, the circular base plate 801 and the circular sleeve 902 in each joint component are detachable structures, and are connected to form an integral structure by connecting end to end. The above special structural setting makes the connection between the first joint component 3, the second joint component 4 and the third joint component 5 more secure, and can ensure that the axes of the circular sleeves 902 between the first joint component 3, the second joint component 4 and the third joint component 5 are perpendicular to each other, which greatly expands the adjustable angle range.

[0063] like Figure 3 As shown, the connecting protrusion 803 is provided with an internal thread hole; Figure 4 As shown, a connecting bolt 904 is provided on the second joint connecting member 9, and the connecting bolt 904 includes a bolt driving cap 905 and a bolt connecting column 906, and the bolt connecting column 906 is provided with an external threaded portion; when the first joint connecting member 8 and the second joint connecting member 9 are fixedly connected, the connecting protrusion 803 is nested in the connecting outer sleeve, and the connecting bolt 904 passes through the circular bottom plate 901 on the second joint connecting member 9 and is fixedly connected to the connecting protrusion 803 through the cooperation of the external threaded portion and the internal threaded hole.

[0064] In any one of the first joint assembly 3, the second joint assembly 4 and the third joint assembly 5, when it is necessary to fix the first joint connector 8 and the second joint connector 9 together, the first joint connector 8 and the second joint connector 9 can be locked by threading the bolt connecting column 906 on the connecting bolt 904 with the internal threaded hole on the connecting protrusion 803, thereby forming a joint assembly with a fixed structure.

[0065] like Figure 4 As shown, the bolt driving cap 905 is a circular structure, and the outer edge of the bolt driving cap 905 is provided with anti-slip stripes; the bolt driving cap 905 is provided with a driving recess 907, and the driving recess 907 is located in the central position of the bolt driving cap 905, and the driving recess 907 is located on the opposite side of the bolt connecting column 906.

[0066] During use, after the connecting protrusion 803 is nested in the connecting outer sleeve, the connecting bolt 904 is controlled to pass through the circular bottom plate 901 on the second joint connector 9, so that the external threaded portion of the connecting bolt 904 and the internal threaded hole on the connecting protrusion 803 can be threadedly matched. At this time, the operator's fingers clamp the anti-slip stripes on the outer edge of the bolt driving cap 905, and the threaded match is gradually deepened by rotating the connecting bolt 904 to complete the pre-positioning; when it is difficult to rotate further by hand, an external tool is used to insert it into the driving recess 907, thereby achieving complete locking. Specifically, the driving recess 907 is a hexagonal recess.

[0067] like Figure 3 As shown, a connecting through hole is opened on the circular bottom plate 901, and a connecting recessed portion 908 is formed outside the connecting through hole; the connecting bolt 904 passes through the connecting through hole on the circular bottom plate 901 and is fixedly connected to the connecting protrusion 803 through the cooperation of the external threaded portion and the internal threaded hole, and the bolt driving cap 905 is buried in the connecting recessed portion 908.

[0068] Based on the above structure, a connection recess 908 is formed outside the connecting through hole. When the bolt connection column 906 and the internal threaded hole on the connecting protrusion 803 are completely locked, the bolt driving cap 905 is completely buried in the connection recess 908 to prevent the bolt driving cap 905 from being exposed and affecting the operation.

[0069] Specifically, the connecting bolt 904 is an integrally formed metal structure. The connecting bolt 904 is provided as an integrally formed metal structure, which has the advantages of simple structure, convenient manufacturing, etc., and is easy to realize repeated use.

[0070] like Figure 1 and Figure 2As shown, the reference plate 1 is a plate-like structure, and a plurality of positioning recesses 101 are provided on the reference plate 1. Reflective stickers are attached to the positioning recesses 101, and the reflective marking points are formed by attaching and fixing the reflective stickers to the positioning recesses 101. By attaching reflective stickers to the positioning recesses 101 to form reflective marking points, a real-time optical positioning function can be realized through a simple structure.

[0071] Specifically, the reference plate 1, the first clamping plate 201, the second clamping plate 203 and the connecting plate 202 are plastic structures, and the CT reference sphere is a stainless steel sphere or a ceramic sphere. Using a stainless steel sphere or a ceramic sphere as a CT reference sphere can make the difference between the density of the CT reference sphere and the density of the surrounding material larger, which is convenient for improving the CT scanning imaging effect.

[0072] like Figure 1 and Figure 2 As shown, preferably, the first joint assembly 3 is connected to the reference plate 1 through a first connecting rod 6, and the third joint assembly 5 is connected to the clamping portion 2 through a second connecting rod 7. The first connecting rod 6 and the second connecting rod 7 are provided, so that the overall structure of the device can be adjusted by adjusting the length and shape of the first connecting rod 6 and the second connecting rod 7 during the production process.

[0073] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made according to the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A multi-stage adjustable calibration device, characterized in that: include: A reference plate, wherein a plurality of reflective marking points are arranged on the reference plate; A clamping portion, wherein the clamping portion comprises a first clamping plate, a connecting plate and a second clamping plate, wherein the first clamping plate and the second clamping plate are arranged opposite to each other, a clamping space is formed between the first clamping plate and the second clamping plate, the first clamping plate is connected to the second clamping plate through the connecting plate to form an integral structure, and a plurality of CT reference spheres are arranged in the connecting plate; A connecting part, the connecting part includes a first joint component, a second joint component and a third joint component, the first joint component is connected to the reference plate, the third joint component is connected to the clamping part, the first joint component and the second joint component are detachably connected, and the second joint component and the third joint component are detachably connected.

2. A multi-stage adjustable calibration device according to claim 1, characterized in that: The first joint assembly, the second joint assembly and the third joint assembly are respectively provided with a first joint connecting member and a second joint connecting member; The first joint connection member includes a circular base plate and a plurality of first angle adjustment teeth disposed on the circular base plate, wherein the first angle adjustment teeth are arranged in a circular shape; The second joint connection member includes a circular base plate and a circular sleeve, wherein the circular base plate is arranged at one end of the circular sleeve, and the other end of the circular sleeve is provided with a plurality of second angle adjustment teeth, and the second angle adjustment teeth are arranged in a circular shape; A connecting protrusion is provided on the circular base plate of the first joint connecting member, and the connecting protrusion extends toward the second joint connecting member. A connecting outer sleeve is provided in the circular sleeve on the second joint connecting member, and the opening of the connecting outer sleeve faces the first joint connecting member. In the first joint assembly, the second joint assembly or the third joint assembly, when the first joint connector and the second joint connector are fixed to each other, the connecting protrusion is nested in the connecting outer sleeve, and the first angle adjustment tooth and the second angle adjustment tooth are engaged with each other.

3. A multi-stage adjustable calibration device according to claim 2, characterized in that: The circular sleeve on the first joint component and the reference plate are an integrally formed structure, and the circular base plate on the third joint component and the clamping portion are an integrally formed structure; The circular base plate on the first joint component and the circular sleeve on the second joint component are an integrally formed structure, and the circular base plate on the second joint component and the circular sleeve on the third joint component are an integrally formed structure; The axis of the circular sleeve on the first joint component is perpendicular to the axis of the circular sleeve on the second joint component, and the axis of the circular sleeve on the third joint component is perpendicular to the axis of the circular sleeve on the second joint component.

4. A multi-stage adjustable calibration device according to claim 2, characterized in that: The connecting protrusion is provided with an internal threaded hole, the second joint connecting member is provided with a connecting bolt, the connecting bolt comprises a bolt driving cap and a bolt connecting column, and the bolt connecting column is provided with an external threaded portion; When the first joint connector and the second joint connector are fixedly connected, the connecting protrusion is nested in the connecting outer sleeve, and the connecting bolt passes through the circular bottom plate on the second joint connector and is fixedly connected to the connecting protrusion through the cooperation of the external threaded portion and the internal threaded hole.

5. A multi-stage adjustable calibration device according to claim 4, characterized in that: The bolt driving cap is a circular structure, and the outer edge of the bolt driving cap is provided with anti-slip stripes; The bolt driving cap is provided with a driving recessed portion, the driving recessed portion is located at the central position of the bolt driving cap, and the driving recessed portion is located at the opposite side of the bolt connection column.

6. A multi-stage adjustable calibration device according to claim 4, characterized in that: A connecting through hole is provided on the circular bottom plate, and a connecting recess is formed outside the connecting through hole; the connecting bolt passes through the connecting through hole on the circular bottom plate and is fixedly connected to the connecting protrusion through the cooperation of the external thread part and the internal thread hole, and the bolt driving cap is buried in the connecting recess.

7. The multi-stage adjustable calibration device according to claim 4, characterized in that: The connecting bolt is an integrally formed metal structure.

8. The multi-stage adjustable calibration device according to claim 1, characterized in that: The reference plate is a plate-like structure, and a plurality of positioning recesses are provided on the reference plate. Reflective stickers are attached to the positioning recesses, and the reflective stickers are attached and fixed to the positioning recesses to form the reflective marking points.

9. A multi-stage adjustable calibration device according to any one of claims 1 to 8, characterized in that: The reference plate, the first clamping plate, the second clamping plate and the connecting plate are plastic structures, and the CT reference sphere is a stainless steel sphere or a ceramic sphere.

10. A multi-stage adjustable calibration device according to any one of claims 1 to 8, characterized in that: The first joint assembly is connected to the reference plate via a first connecting rod, and the third joint assembly is connected to the clamping portion via a second connecting rod.

Images