Connecting device, marker assembly and CT bed

Abstract

The utility model discloses a connecting device, a marker assembly and a CT bed, and the connecting device comprises a mounting seat which is detachably connected to a CT moving bed plate and keeps moving synchronously with the CT moving bed plate; the adjusting seat is provided with a supporting column and is used for supporting the marker; the adjusting seat is further provided with a locking mechanism, the position of the locking mechanism can be adjusted relative to the mounting seat, the locking mechanism and the mounting seat can be quickly locked and loosened, the position of the adjusting seat is adjustable, the marker is conveniently adjusted, the marker is aligned with the disease position of the patient, and the tracking precision is improved. Experiments show that the device is high in stability, easy and convenient to use and operate and high in practicability, the operation preparation time is effectively shortened, and the efficiency is improved. The connecting device and the marker assembly can be used for marking and tracking a human body in a robot navigation operation and obtaining the deformation quantity of a CT bed board to be fed back to a robot system for compensation and correction, errors are reduced, and the marker assembly is further used for converting the disease position of a patient into coordinates of the robot system together with a CT host marker to conduct an accurate positioning operation.

Description

Technical Field

[0001] The utility model relates to medical technology, and more specifically to a connecting device, a marker component and a CT bed. Background Art

[0002] During the puncture operation, the navigation surgical robot under CT guidance needs to fix a marker on the moving bed board of the CT bed. The relative position of the marker and the human body remains unchanged. The marker can be used to obtain the deformation of the CT bed board and feed it back to the robot system for compensation correction to reduce errors. It is also used together with the marker of the CT host to convert the patient's disease position into the system coordinate system. In order to enable the optical marker to be connected to the CT moving bed quickly, stably, firmly and positionally adjustable, a fixing device is designed to connect the CT bed and the fixed marker.

[0003] Experiments show that the closer the optical marker is to the puncture target, the higher the navigation positioning accuracy. Since it is inconvenient to move the patient, in order to simplify the adjustment operation, the marker needs to be designed as a position-adjustable structure. To facilitate the adjustment of the marker's position, the moving part of the fixture and the mounting seat connected to the CT bed are designed to be relatively movable, so a locking structure is required to lock the position. However, the existing moving parts and guide rails are generally fixed directly by knobs and screws. The force area between the guide rail and the screw is small, and the side of the guide rail is easily depressed by the knob screw, resulting in unsmooth movement or depression, resulting in insufficient travel of the knob screw and failure to hold it firmly.

[0004] In addition, the locking requires multiple turns of the knob screw to tighten it tightly, and there is no fixed torque. The operator cannot confirm whether it is locked or it is locked too tightly, which causes trouble when loosening it by twisting it back. Utility Model Content

[0005] The embodiments of the utility model provide a connecting device, a marker assembly and a CT bed, which can realize fast and non-destructive locking.

[0006] The embodiment of the utility model provides a connection device, which can be quickly and positionally connected and fixed on a CT mobile bed plate to achieve synchronous movement with the CT bed plate, and can be used to track the human body and obtain the deformation of the CT bed plate and feed it back to the robot system for compensation and correction to reduce errors; the connection device is also used to convert the patient's disease position into the robot system coordinates together with the CT host marker to perform precise positioning surgery.

[0007] An embodiment of the utility model also provides a connecting device, characterized in that it includes: a mounting seat; an adjusting seat, which is relatively movably installed with the mounting seat and is configured to be connected to a marker; a locking mechanism, which is provided on one of the mounting seat and the adjusting seat, and includes a locking state that generates a locking friction force with the other of the mounting seat and the adjusting seat and a separated loose state.

[0008] In an exemplary embodiment, the locking mechanism includes a friction block and a driving device for driving the friction block to move;

[0009] The driving device can drive the friction block to contact with one of the mounting seat and the adjusting seat to generate locking friction or separation.

[0010] In an exemplary embodiment, the adjustment seat includes a base that is relatively movably mounted with respect to the mounting seat, and a support seat that is arranged on the top of the base and detachably connected to the base, the locking mechanism is arranged on the base, and the support seat is configured to be connected to a marker.

[0011] In an exemplary embodiment, the base is provided with a first installation cavity extending in a height direction of the adjustment base, and the first installation cavity has a first opening located on a bottom surface of the base;

[0012] The base is also provided with a second installation cavity which is in communication with the first installation cavity and extends to the side surface of the base along the horizontal direction of the adjustment seat;

[0013] The driving device includes a pull rod arranged in the first mounting cavity, and a driving rod arranged in the second mounting cavity and extending out of the base; the driving rod is connected to the pull rod and can drive the pull rod to move along the height direction in the first mounting cavity; the friction block is connected to one end of the pull rod close to the mounting seat.

[0014] In an exemplary embodiment, a groove is provided on a side of the pull rod, and the drive rod is provided with a drive portion extending into the groove, and a pressing portion connected to the drive portion and extending from the second mounting cavity to the outside of the base.

[0015] In an exemplary embodiment, the pull rod and the friction block are detachably connected, a first screw-on portion is provided on a side surface of one of the pull rod and the friction block, and a first screw-on groove that cooperates with and engages with the first screw-on portion is provided on a side surface of the other.

[0016] In an exemplary embodiment, a first limiting portion is provided on a side surface of the pull rod, and a boss for stopping the first limiting portion is provided on a side wall of the first mounting cavity.

[0017] In an exemplary embodiment, the locking mechanism further includes a reset device, which provides the driving device with power to drive the friction block to contact the mounting seat or the adjustment seat to generate locking friction force;

[0018] The resetting device comprises a limit block provided in the first installation cavity and located above the pull rod, and an elastic element abutting between the limit block and the pull rod.

[0019] In an exemplary embodiment, the limiting block and the pulling rod are respectively provided with positioning grooves for accommodating and positioning two ends of the elastic element.

[0020] In an exemplary embodiment, a second rotational connection portion is provided on a side surface of one of the limiting block and the first installation cavity, and a second rotational connection groove that cooperates with and engages with the second rotational connection portion is provided on a side surface of the other one.

[0021] In an exemplary embodiment, the first installation cavity has a second opening located on the top surface of the base, and the limiting block stops at the second rotational connection groove or the second rotational connection portion along the height direction.

[0022] In an exemplary embodiment, the base is provided with a guide groove, and the mounting seat is provided with a guide rail that moves in cooperation with the guide groove;

[0023] One side of the guide groove has an interlocking structure with one side of the guide rail, and the other side of the guide groove has an inclined surface with a gap between the other side of the guide rail for accommodating a friction block;

[0024] The friction block comprises a mounting portion and a wedge-shaped portion, wherein the mounting portion is connected in cooperation with the pull rod, and the wedge-shaped portion can extend into the gap and cooperate with the inclined surface of the guide groove to generate a locking friction force.

[0025] In an exemplary embodiment, the guide rail and the mounting seat are detachably connected; the mounting seat is provided with a mounting groove, the guide rail and the mounting groove are engaged with each other and are connected and fixed by a connecting piece.

[0026] In an exemplary embodiment, the mounting seat is provided with scale marks, and the relative positions of the mounting seat and the adjustment seat can be adjusted according to the scale marks.

[0027] The embodiment of the present utility model further provides a marker assembly, characterized in that it comprises: a connecting device as described in any of the above embodiments, and an optical marker installed on the connecting device.

[0028] In an exemplary embodiment, the optical marker includes a rigid body and a plurality of markers disposed on the rigid body; the rigid body includes a vertical rigid body and a horizontal rigid body connected to the vertical rigid body.

[0029] The embodiment of the utility model further provides a CT bed, characterized in that it comprises: a bed body, and a marker assembly as described in any of the above embodiments installed on the bed body, wherein a mounting seat of the marker assembly is installed in cooperation with the bed body.

[0030] The connection device of the embodiment of the utility model can generate a locking friction force to lock the mounting seat and the adjustment seat by providing a locking mechanism, without causing damage to the mounting seat.

[0031] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained through the structures particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are used to provide a further understanding of the technical solution of the utility model and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the utility model and do not constitute a limitation on the technical solution of the utility model.

[0033] Figure 1 A three-dimensional view of a connection device according to an embodiment of the utility model having a marker installed thereon;

[0034] Figure 2 for Figure 1 3D split diagram of

[0035] Figure 3 This is an appearance view of a mounting seat with a locking device of a connecting device according to an embodiment of the utility model installed on a guide rail;

[0036] Figure 4 A cross-sectional view of a vertical guide rail in a state where a mounting seat provided with a locking device of a connection device according to an embodiment of the utility model and the guide rail are installed in cooperation with each other;

[0037] Figure 5 A cross-sectional view of a parallel guide rail in a state where a mounting seat provided with a locking device and a guide rail of a connecting device according to an embodiment of the utility model are in cooperation with each other;

[0038] Figure 6 A three-dimensional view of a mounting base of a connecting device according to an embodiment of the utility model;

[0039] Figure 7 A front cross-sectional view of a mounting base of a connecting device according to an embodiment of the utility model;

[0040] Figure 8 This is an appearance view of a pull rod of a locking device of a connecting device according to an embodiment of the utility model;

[0041] Fig. 9 An axial cross-sectional view of a locking device of a connecting device according to an embodiment of the utility model;

[0042] Fig.10 A three-dimensional view of a friction block of a locking device of a connecting device according to an embodiment of the utility model;

[0043] Fig.11 This is a front cross-sectional view of a friction block of a locking device of a connecting device according to an embodiment of the utility model.

[0044] Description of reference numerals:

[0045] Connecting device-100; mounting seat-1; adjusting seat-2; locking mechanism-3; marking object-4; bottom surface-10; mounting groove-11; guide rail-12; mounting hole 110; connecting piece-13; friction block-3a; driving device-3b; base-21; supporting seat-22; plug-in part-220; plug-in groove-215; first mounting cavity-211; second mounting cavity-212; pull rod-31; driving rod-32; groove-310; driving part -320; pressing portion-321; first rotational connection portion-311; first rotational connection groove-301; first limiting portion-312; boss-211; reset device-3c; limiting block-33; elastic element-34; positioning grooves-330, 313; second rotational connection portion-331; second rotational connection groove-213; guide groove-214; V-shaped groove-2141; V-shaped protrusion-121; inclined surface-2142; mounting portion-302; wedge-shaped portion-303. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the utility model more clear, the embodiments of the utility model will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other arbitrarily without conflict.

[0047] like Figure 1-11 As shown, an embodiment of the utility model provides a connecting device 100, which can fix the marker 4 on the movable bed board of the CT bed.

[0048] like Figure 1 , Figure 2 As shown, the connection device 100 of the embodiment of the utility model comprises a mounting seat 1, an adjustment seat 2 and a locking mechanism 3, wherein the adjustment seat 2 and the mounting seat 1 can be relatively movably installed and are configured to be connected to a marker 4. The locking mechanism 3 is disposed on one of the mounting seat 1 and the adjustment seat 2, and includes a locking state in which a locking friction force is generated with the other of the mounting seat 1 and the adjustment seat 2, and a separated loose state.

[0049] The connection device 100 of the embodiment of the utility model can generate a locking friction force to lock the mounting seat 1 and the adjusting seat 2 by providing a locking mechanism 3 without causing damage to the mounting seat and the adjusting seat 2.

[0050] like Figure 1 , Figure 2 As shown, in this embodiment, the mounting seat 1 is in the shape of a plate and can be connected to the CT bed. The bottom surface 10 of the mounting seat 1 is used to connect to the CT bed. Exemplarily, the bottom surface 10 of the mounting seat 1 can be bonded to the CT movable bed board with glue. The bottom surface of the mounting seat 1 has a sufficient area and its shape matches the shape of the bed board, so it can be tightly fitted and firmly connected to the bed board. Since the adhesive bonding method is adopted, it can be easily disassembled when not used for a long time.

[0051] like Figure 2 As shown, the top surface of the mounting seat 1 is provided with a mounting groove 11 and a guide rail 12 detachably connected to the mounting groove 11. The bottom of the mounting groove 11 is provided with a plurality of mounting holes 110 penetrating the bottom surface of the mounting seat 1, and the end surface where the guide rail 12 and the mounting groove 11 are mounted in cooperation is provided with a plurality of connecting holes (not shown). The mounting seat 1 also includes a connecting member 13 extending from the bottom surface of the mounting seat 1 into the mounting holes 110 and the connecting holes and connecting the guide rail 12 to the mounting seat 1, and the connecting member 13 may be a connecting screw.

[0052] The guide rail 12 and the mounting seat 1 of the embodiment of the utility model are detachably connected, and during maintenance, components can be replaced separately, thereby reducing maintenance costs.

[0053] like Figure 1 , Figure 3-5 As shown, the locking mechanism 3 includes a friction block 3a and a driving device 3b for driving the friction block 3a to move. The driving device 3b can drive the friction block 3a to contact with the mounting seat 1 and the adjustment seat 2 to generate locking friction or separation. In this embodiment, the locking mechanism 3 is arranged on the adjustment seat 2, and the driving device 3b can drive the friction block 3a to generate locking friction with the mounting seat 1.

[0054] The embodiment of the utility model is provided with a driving device 3b, which can drive the friction block 3a to move and generate a locking friction force with the mounting seat 1 to limit the relative movement of the adjustment seat 2 and the mounting seat 1, or to separate from the mounting seat 1 so that the mounting seat 1 and the adjustment seat 2 can slide relative to each other. The friction block 3a is in plane contact with the mounting seat 1 and has a large contact area, which ensures the wear resistance between the moving parts and avoids easy wear caused by small contact area.

[0055] like Figure 2As shown, the adjustment seat 2 includes a base 21 that is relatively movable with the mounting seat 1, and a support seat 22 that is arranged on the top of the base 21 and is detachably connected to the base 21. The locking mechanism 3 is arranged on the base 21, and the support seat 22 is arranged to be connected to the marker 4. One of the support seat 22 and the base 21 is provided with a plug-in portion 220, and the other is provided with a plug-in groove 215 that cooperates with the plug-in portion 220. The base 21 and the support seat 22 are arranged to be detachably connected, which facilitates the installation of the locking mechanism 3.

[0056] like Figure 6 , Figure 7 As shown, the base 21 is provided with a first installation cavity 211 extending along the height direction of the adjustment base 2, and a second installation cavity 212 communicating with the installation cavity 211 and extending to the side of the base 21 along the horizontal direction of the adjustment base 2. The first installation cavity 211 has a first opening on the bottom surface of the base 21.

[0057] like Figure 4-5 As shown, the driving device 3b includes a pull rod 31 disposed in the first installation cavity 211, and a driving rod 32 disposed in the second installation cavity 212 and extending outside the base 21. The driving rod 32 is connected to the pull rod 31. Figure 5 In the embodiment, the user moves the driving rod 32 left and right, and the driving rod 32 can drive the pull rod 31 to move up and down along the height direction. Figure 5 , Figure 8 , Fig. 9 As shown, the side of the pull rod 31 is provided with a groove 310 (see Fig. 9 The driving rod 32 is provided with a driving portion 320 extending into the groove 310, and a pressing portion 321 connected to the driving rod 32 and extending out of the second mounting cavity 212 to the outside of the base (see Figure 5 As shown in the figure of this embodiment, the pressing part 321 is swung left and right, and the driving rod 32 drives the driving part 320 to move in the opposite direction to drive the pull rod 31 to move up and down along the height direction.

[0058] like Figure 5 , Fig. 9 , Fig.11 As shown, the pull rod 31 and the friction block 3a in this embodiment can be detachably connected. A first screw connection portion 311 (see Fig. 9 The other side is provided with a first rotation groove 301 (see Fig.11 When installing, the first rotational connection portion 311 extends into the first rotational connection groove 311 and rotates a certain angle before being engaged; when disengaging, the first rotational connection portion 311 rotates a certain angle before being disengaged from the first rotational connection groove 311.

[0059] like Figure 7 , Fig. 9The side of the pull rod 31 is provided with a first limiting portion 312 (see Fig. 9 As shown in FIG. 1 ), the side wall of the first installation cavity 211 is provided with a boss 211 for stopping the first limiting portion 312 (see FIG. 1 ). Figure 7 As shown), it is used to limit the distance that the pull rod 31 moves toward the mounting seat 1.

[0060] like Figure 4 , Figure 5 As shown, the locking mechanism 3 also includes a reset device 3c, which provides the driving device 3b with the power to drive the friction block 3a to contact the mounting seat 1 or the adjustment seat 2 to generate locking friction. The reset device 3c includes a limit block 33 disposed in the first mounting cavity 211 and located above the pull rod 31, and an elastic element 34 abutting between the limit block 33 and the pull rod 31. The limit block 33 and the pull rod 31 are respectively provided with positioning grooves 330 and 313 for accommodating and positioning the two ends of the elastic element 34.

[0061] A second screw connection portion 331 is provided on one side of the stop block 33 and the base 21 (see Figure 4 The other side is provided with a second rotation groove 213 (see Figure 7 The limiting block 33 is rotated by a predetermined angle to engage with the second rotation groove 213 of the base 21 to hold the limiting block 33 in position or to separate the limiting block 33.

[0062] The embodiment of the utility model is provided with a reset device 3c, which can drive the pull rod and the friction block 3a to automatically lock the guide rail 12, without the operator having to judge whether it is locked; when releasing the lock, the driving rod is operated to overcome the locking force provided by the reset device 3c to disengage, and the operation is simple and efficient.

[0063] like Figure 7 As shown, the first installation cavity 211 has a second opening located on the top surface of the base 21, and the limit block 33 is installed into the first installation cavity 211 from the second opening. The second rotation groove 213 forms a convex shoulder, and the limit block 33 stops at the second rotation groove 213 along the height direction to limit the movement of the limit block 33 in the height direction.

[0064] like Figure 6 , Figure 7 As shown, the base 21 is provided with a guide groove 214, and the guide rail 12 of the mounting base 1 moves in coordination with the guide groove 214. One side of the guide groove 214 and one side of the guide rail 12 have a chimeric structure, and the chimeric structure of this embodiment is a V-shaped groove 2141 on one side of the guide groove 214 and a V-shaped protrusion 121 on one side of the guide rail 12 (see Figure 4 The other side of the guide groove 214 has a slope 2142 and a gap between the guide rail 12 for accommodating the friction block 3a.

[0065] like Fig.10As shown, the friction block 3a includes a mounting portion 302 and a wedge-shaped portion 303. The mounting portion 302 has a first rotation groove 301, which is connected with the pull rod 31; the wedge-shaped portion 303 can extend into the gap between the guide rail 12 and the friction block 3a, and the wedge surface cooperates with the inclined surface of the guide groove to generate a locking friction force (see Figure 4 shown).

[0066] The mounting base 1 of the utility model embodiment is provided with a scale mark (refer to Figure 2 As shown), the relative positions of the mounting seat 1 and the adjusting seat 2 can be adjusted according to the scale marks, so as to facilitate understanding and adjustment of the moving distance of the adjusting seat 2.

[0067] like Figure 1 As shown, the embodiment of the utility model further provides a marker assembly, including: a connecting device 100 as in any of the above embodiments, and an optical marker 4 installed on the connecting device 100. The optical marker 4 includes a rigid body, and a plurality of markers 41 arranged on the rigid body. The rigid body includes a vertical rigid body 42 and a horizontal rigid body 43 connected to the vertical rigid body 42.

[0068] The present invention provides a CT bed, comprising: a bed body (not shown), and a marker assembly as described in any of the above embodiments mounted on the bed body, wherein a mounting base 1 of the marker assembly is mounted in cooperation with the bed body.

[0069] The marker component provided in the embodiment of the utility model can be used to mark and track the human body during robot navigation surgery and to obtain the CT bed plate deformation variable and feed it back to the robot system for compensation correction to reduce errors; the marker component is also used to convert the patient's disease position into the robot system coordinates together with the CT host marker to perform precise positioning surgery.

[0070] In the description of the present invention, it should be noted that the terms "left", "right", "up", "down", "one side", "the other side", "one end", "the other end", "side", "relative", "four corners", "periphery", "'mouth'-shaped structure" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the structure referred to has a specific orientation, is constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0071] In the description of the embodiments of the present utility model, unless otherwise clearly specified and limited, the terms "connection", "direct connection", "indirect connection", "fixed connection", "installation", and "assembly" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; the terms "installation", "connection", and "fixed connection" can be a direct connection, or an indirect connection through an intermediate medium, or the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0072] Although the implementation methods disclosed in the utility model are as above, the above contents are only implementation methods adopted to facilitate the understanding of the utility model, and are not used to limit the utility model. Any technician in the field to which the utility model belongs can make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in the utility model, but the scope of patent protection of the utility model shall still be defined by the attached claims.

Claims

1. A connection device, characterized in that: include: Mounting seat; An adjustment seat, which is relatively movable with the mounting seat and is configured to be connected to the marker; A locking mechanism, provided on one of the mounting seat and the adjusting seat, including a locking state in which a locking friction force is generated with the other of the mounting seat and the adjusting seat and a separated loose state; The locking mechanism includes a friction block and a driving device for driving the friction block to move; The driving device can drive the friction block to contact with one of the mounting seat and the adjusting seat to generate locking friction or separation.

2. The connection device according to claim 1, characterized in that: The adjustment seat includes a base that is relatively movably mounted with the mounting seat, and a support seat that is arranged on the top of the base and is detachably connected to the base. The locking mechanism is arranged on the base, and the support seat is configured to be connected to a marker.

3. The connection device according to claim 2, characterized in that: The base is provided with a first installation cavity extending along the height direction of the adjustment base, and the first installation cavity has a first opening located on the bottom surface of the base; The base is also provided with a second installation cavity which is in communication with the first installation cavity and extends to the side surface of the base along the horizontal direction of the adjustment seat; The driving device includes a pull rod arranged in the first mounting cavity, and a driving rod arranged in the second mounting cavity and extending out of the base; the driving rod is connected to the pull rod and can drive the pull rod to move along the height direction in the first mounting cavity; the friction block is connected to one end of the pull rod close to the mounting seat.

4. The connection device according to claim 3, characterized in that: A groove is provided on the side of the pull rod, and the driving rod is provided with a driving part extending into the groove, and a pressing part connected with the driving part and extending from the second installation cavity to the outside of the base.

5. The connection device according to claim 3, characterized in that: The pull rod and the friction block are detachably connected, a first screw connection portion is provided on a side surface of one of the pull rod and the friction block, and a first screw connection groove which cooperates with and clamps the first screw connection portion is provided on a side surface of the other one.

6. The connection device according to claim 3, characterized in that: A first limiting portion is disposed on a side surface of the pull rod, and a boss for stopping the first limiting portion is disposed on a side wall of the first mounting cavity.

7. The connection device according to claim 3, characterized in that: The locking mechanism further comprises a reset device, which provides the driving device with power to drive the friction block to contact the mounting seat or the adjusting seat to generate locking friction force; The resetting device comprises a limit block provided in the first installation cavity and located above the pull rod, and an elastic element abutting between the limit block and the pull rod.

8. The connection device according to claim 7, characterized in that: The limiting block and the pulling rod are respectively provided with positioning grooves for accommodating and positioning the two ends of the elastic element.

9. The connection device according to claim 7, characterized in that: A second rotational connection portion is provided on one side of the limiting block and the first installation cavity, and a second rotational connection groove that cooperates with and clamps the second rotational connection portion is provided on the other side.

10. The connection device according to claim 9, characterized in that: The first installation cavity has a second opening located on the top surface of the base, and the limiting block is stopped at the second rotation groove or the second rotation portion along the height direction.

11. The connection device according to any one of claims 3 to 10, characterized in that: The base is provided with a guide groove, and the mounting seat is provided with a guide rail that moves in coordination with the guide groove; One side of the guide groove has an interlocking structure with one side of the guide rail, and the other side of the guide groove has an inclined surface with a gap between the other side of the guide rail for accommodating a friction block; The friction block comprises a mounting portion and a wedge-shaped portion, wherein the mounting portion is connected in cooperation with the pull rod, and the wedge-shaped portion can extend into the gap and cooperate with the inclined surface of the guide groove to generate a locking friction force.

12. The connection device according to claim 11, characterized in that: The guide rail and the mounting seat are detachably connected; the mounting seat is provided with a mounting groove, the guide rail and the mounting groove are matched and snap-fitted, and are connected and fixed by a connecting piece.

13. The connection device according to any one of claims 1 to 10, characterized in that: The mounting seat is provided with a scale mark, and the relative positions of the mounting seat and the adjusting seat can be adjusted according to the scale mark.

14. A marker assembly, characterized in that: include: A connection device as described in any one of claims 1 to 13, and an optical marker installed on the connection device.

15. The marker assembly according to claim 14, characterized in that: The optical marker comprises a rigid body and a plurality of marking objects arranged on the rigid body; the rigid body comprises a vertical rigid body and a horizontal rigid body connected to the vertical rigid body.

16. A CT bed, characterized in that: include: A bed body, and a marker assembly as claimed in claim 14 or 15 installed on the bed body, wherein the mounting seat of the marker assembly is installed in cooperation with the bed body.

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