CN219440466U - Adjusting device and accelerator for radiotherapy using same - Google Patents

Abstract

The application provides an adjusting device and an accelerator for radiotherapy using the adjusting device, comprising a fixing frame and a first rotating unit; the first rotating unit is provided with a first rotating part capable of rotating around a first direction, a first sliding rail for the first rotating part to rotate, and a first driving component for driving the first rotating part; the first sliding rail comprises a first extending part, a second extending part and a third extending part; the first rotating part rotates around the first direction respectively against the first extending part, the second extending part and the third extending part under the driving of the first driving component. Accordingly, the freedom of movement of the linac relative to the treatment couch can be increased, and the structural complexity and equipment cost can be reduced.

Description

Adjusting device and accelerator for radiotherapy using same

Technical Field

The present utility model relates to an adjustment device capable of increasing the degree of freedom of movement of a linear accelerator with respect to a treatment couch and reducing the complexity of the structure and the cost of equipment, and an accelerator for radiotherapy using the adjustment device.

Background

The linear accelerator is used as an important means for treating cancer in radiotherapy of patients, and is widely applied in a real scene, but the precision requirement of the radiotherapy is higher.

The current medical linear accelerator drives the ray source to rotate around the focus by rotating the rotating frame, so that rays irradiate the focus from different directions. However, both the patient and the lesion have three-dimensional volumes, and the rotating gantry is required to rotate and simultaneously perform operations such as pitching.

In the prior art, the degree of freedom of the ray source can be increased by adopting the design of a robot arm, but the problems are complex structure and high cost.

Patent document 1 with application number of cn201516203. X discloses a novel base for an accelerator treatment device, wherein a boat-shaped rocker arm is installed below a rotating frame, so that the rotating frame can rotate around a focus and pitch at a certain angle, and multi-angle omnidirectional irradiation of the focus is realized.

However, the rotating frame is usually heavy, and the rotating shaft bears very large torque, so that the requirement on a transmission device is very high, the structure is complex, the cost is high, and the failure is easy to occur.

For this reason, in the prior art, there is a technical problem of increasing the degree of freedom of movement of the linac relative to the treatment couch, and reducing the structural complexity and the equipment cost.

Reference to the literature

Patent literature

Patent document 1: CN201516203. X

Disclosure of Invention

The present utility model provides an adjusting device for increasing the freedom of movement of a linear accelerator relative to a treatment table and reducing the complexity of the structure and the equipment cost, and an accelerator for radiotherapy using the adjusting device. In order to achieve the above object, one aspect of the present utility model is an adjusting device, including a fixing frame and a first rotating unit disposed on the fixing frame; the first rotating unit is provided with a first rotating part capable of rotating around a first direction, a first sliding rail arranged on the fixing frame and used for rotating the first rotating part, and a first driving assembly arranged on the fixing frame and used for driving the first rotating part; the first rotating portion has an inner side surface close to a rotation axis thereof and an outer side surface away from the rotation axis, and in a cross section perpendicular to the first direction, the inner side surface and the outer side surface are in concentric circular arcs; the first sliding rail comprises a first extension part which is abutted against the inner side surface and extends along the first direction, a second extension part which is abutted against the outer side surface and extends along the first direction, and a third extension part which is abutted against the inner side surface or the outer side surface and extends along the first direction; the first rotating part rotates around the first direction respectively against the first extending part, the second extending part and the third extending part under the driving of the first driving component.

According to the technical scheme, the first rotating part can rotate around the first direction along the first sliding rail under the drive of the first driving assembly.

In a preferred form, the third extension abuts the outer side surface; and on the planes of the second extension part and the third extension part, the projection of the first extension part and the projection of the rotation axis of the first rotation part are overlapped with each other, and both the projections fall between the second extension part and the third extension part.

According to the technical scheme, a stable supporting and limiting structure is formed between the first extending part and the second and third extending parts.

In a preferred mode, the first driving assembly comprises a first driving motor arranged on the fixing frame, a first screw rod connected with the output end of the first driving motor, and a first nut sleeved on the first screw rod, and the first nut is fixedly connected with the first rotating part.

In a preferred embodiment, the first screw extends substantially in a direction perpendicular to the first direction and parallel to a plane in which the second and third extensions are located; the first driving motor drives the first screw rod to rotate and pushes the first nut to move away from/close to the first driving motor along the extending direction of the first screw rod, so that the first rotating part is pushed to rotate.

According to the technical scheme, the first driving motor can push the first rotating part to perform rotary motion through the first lead screw and the first nut.

In a preferred mode, there is also a second rotating unit that rotates around a second direction perpendicular to the first direction; the second rotating unit comprises a second sliding rail, a second driving motor and a second sliding block, and the section of the second sliding rail perpendicular to the second direction is arc-shaped; and in a working state, the second driving motor drives the second sliding block to move along the second sliding rail.

According to the technical scheme, the second rotating unit realizes the angle adjustment around the second direction through the movement of the second sliding block on the arc-shaped second sliding rail.

In a preferred mode, the second driving motor is a linear motor, and comprises a stator fixed on the second sliding rail and a rotor fixed on one side of the second sliding block, which faces the second sliding rail; under the working condition, the mover drives the second sliding block to move along the second sliding rail.

According to the technical scheme, the linear motor can conveniently drive the second sliding block to move along the second sliding rail, and the linear motor is simple in structure and convenient to operate.

In a preferred mode, the second slide rail is fixedly connected with the first rotating portion and can rotate around the first direction synchronously with the first rotating portion.

According to the technical scheme, the first rotating part can drive the second rotating unit to conduct angle adjustment around the first direction.

In addition, another aspect of the present utility model is a radiation therapy accelerator including the above-described adjustment device, wherein the radiation therapy accelerator includes an above-ground portion exposed to the ground and an underground portion provided in a pit, and the adjustment device is provided in the pit.

According to the technical scheme, the adjusting device is arranged in the pit, so that occupied space can be saved, and equipment installation is facilitated.

In a preferred embodiment, the radiotherapy accelerator includes an elongated bed plate, a bed support device for supporting the bed plate, and the above-mentioned adjusting device; one end of the bed support device along the longitudinal direction of the bed plate is fixedly connected with the adjusting device of the radiotherapy accelerator.

According to the technical scheme, the rotatable adjusting device is fixedly connected with the treatment bed, so that the angle adjustment of the treatment bed in the first direction and the second direction is realized, and the situation that the heavy accelerator is directly adjusted to the rotating frame is avoided.

The adjusting device and the accelerator for radiotherapy using the same can conveniently perform angle adjustment around the first direction and the second direction on the treatment bed, so that the degree of freedom of the linear accelerator relative to the treatment bed is increased, and the system complexity and the cost caused by directly driving the linear accelerator to rotate are avoided.

Drawings

In order to more clearly illustrate the present utility model, the following description and the accompanying drawings of the present utility model will be given. It should be apparent that the figures in the following description merely illustrate certain aspects of some exemplary embodiments of the present utility model, and that other figures may be obtained from these figures by one of ordinary skill in the art without undue effort.

Fig. 1 is an external view of an exemplary linac.

Fig. 2 is a schematic diagram of the spatial coordinate system of an exemplary linac.

Fig. 3 is a schematic diagram of an assembly of an exemplary adjustment device and treatment couch.

Fig. 4 is a view of the illustrated first rotation unit at an obliquely upward viewing angle.

Fig. 5 is a cross-sectional view of an exemplary first rotary unit.

Fig. 6 is a view of the illustrated first rotation unit at an obliquely downward viewing angle.

Fig. 7 is a schematic view of the linac in an exemplary therapeutic state.

Fig. 8 is an enlarged view of the area a in fig. 5 as exemplified.

Fig. 9 is an installation schematic of an exemplary adjustment device.

Description of the drawings:

100. rotary frame

101. Radiation source

102. Isocenter(s)

200. Therapeutic bed

201. Bed board

202. Supporting frame

203. Supporting base

204. Center of gravity

300. Adjusting device

400. Pit

1. First rotary unit

11. A first rotary part

111. Inside surface

112. Outside surface

114. Rotating part fixing rod

115. Nut connecting piece

2. Second rotary unit

20. Connecting arm

21. Second slide rail

22. Second driving motor

23. Second slider

3. Fixing frame

31. First extension part

32. Second extension part

33. Third extension part

34. Motor fixing rod

35. First drive assembly

351. First driving motor

352. First screw rod

353. First nut

Detailed Description

Various exemplary embodiments of the present application are described in detail below with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative, and is in no way intended to limit the application, uses, or uses of the utility model. This application may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that: the relative arrangement of parts and steps, numerical expressions and values, etc. set forth in these embodiments are to be construed as illustrative only and not as limiting unless otherwise stated.

As used in this application, the word "comprising" or "comprises" and the like means that elements preceding the word encompass the elements recited after the word, and that no other elements are excluded from the possible coverage.

All terms (including technical or scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Parameters of, and interrelationships between, components, and control circuitry for, components, specific models of components, etc., which are not described in detail in this section, can be considered as techniques, methods, and apparatus known to one of ordinary skill in the relevant art, but are considered as part of the specification where appropriate.

Degree of freedom of linac

The spatial coordinate system and the degree of freedom of movement of the linac are described in detail below with reference to fig. 1 and 2. Fig. 1 is an external view of a linac for radiation therapy, and fig. 2 is a schematic view of a spatial coordinate system of the linac for radiation therapy. For convenience of explanation, a linac for radiotherapy may be referred to as a linac.

Referring to fig. 1 and 2, the linac includes a rotating gantry 100 and a couch 200, as an example. For convenience of explanation, the isocenter 102 of the linac, i.e., the O point in the figure, is taken as the origin of the spatial coordinate system, the direction of the center line of the ray beam emitted by the ray source 101 is taken as the Z-axis direction, the direction in which the rotation axis of the rotating gantry 100 is located is taken as the Y-axis direction, and the direction perpendicular to the Y-axis and the Z-axis is taken as the X-axis direction.

In this embodiment, the plane in which the Y axis and the X axis as the first direction are located is the horizontal direction, and the Z axis as the second direction is the vertical direction, and the description of the directions is the same as that described below unless otherwise specified. It is understood that the isocenter 102 refers to the intersection of the centerline of the radiation beam emitted by the radiation source 101 and the axis of rotation of the rotating gantry 100.

The treatment couch 200 comprises a longitudinal couch plate 201 for carrying a patient, a support frame 202 for supporting the couch plate 201 below the couch plate 201, and a support base 203 below the support frame 202, wherein the support frame 202 and the support base 203 form a couch support device of the treatment couch 200. The longitudinal direction of the bed plate 201 is the Y-axis direction, and is perpendicular to the rotation plane of the rotating frame 100.

Generally, during treatment, the patient's lesion is positioned at the isocenter 102, and the rotating gantry 100 is capable of translational movement in the X-axis, Y-axis, and Z-axis directions relative to the couch 200, as well as rotational movement about the axis of rotation of the Y-axis, such that the radiation source 101 rotates about the lesion, thereby causing the radiation beam to irradiate the lesion from different directions.

In this case, the radiation source 101 generally irradiates the focus only by 360 ° from a plane perpendicular to the Y axis at a time, and the patient and the focus have three-dimensional shapes, which often require the radiation source 101 to irradiate three-dimensionally and spherically at multiple angles, so that the degree of freedom of rotation about the X axis and the Z axis is generally increased.

On the other hand, when the patient enters the treatment position, there is an inevitable deviation between the focal position and the position of the isocenter 102, and it is often necessary to fine-tune the displacement and angle of the rotating gantry 100 relative to the treatment couch 200, which also needs to increase the degree of freedom of movement of the rotating gantry 100 relative to the treatment couch 200 as much as possible, so as to adjust the positional deviation between the focal position and the isocenter 102, and make the radiation beam emitted by the radiation source 101 irradiate the focal position more accurately.

In view of the fact that the rotating frame 100 of the linear accelerator is generally heavy, if the rotating frame is directly adjusted to rotate around the X-axis and the Z-axis, the torque borne by the rotating shaft is very large, the requirement on the transmission device is also very high, and the structure is complex and the cost is high. In order to simplify the structure, the present application provides an adjusting device 300 fixedly connected to one end of the support base 203 facing the rotating frame 100, for adjusting the rotation angle of the therapeutic bed 200 around the X-axis and the Z-axis directions, so as to increase the degree of freedom of the rotating frame 100 relative to the therapeutic bed 200.

Adjusting device

Next, the adjusting device 300 will be specifically described with reference to fig. 3 to 8. Fig. 3 is an assembled schematic view of the adjusting device 300 and the treatment couch 200, fig. 4 is a view of the first rotary unit 1 in an obliquely upper view, fig. 5 is a cross-sectional view of the first rotary unit 1, fig. 6 is a view of the first rotary unit 1 in an obliquely lower view, fig. 7 is a schematic view of the linac in a treatment state, and fig. 8 is an enlarged view of a region a in fig. 5.

Referring to fig. 3, as a preferred manner, the adjusting device 300 includes a first rotating unit 1 rotatable about an X-axis, and a second rotating unit 2 rotatable about a Z-axis. Preferably, one end of the support base 203 of the treatment couch 200 facing the rotating gantry 100 is fixedly connected to the second rotating unit 2, and rotates around the Z-axis direction along with the second rotating unit 2. Meanwhile, the second rotating unit 2 is fixedly connected to the first rotating unit 1, so that the supporting base 203 can also rotate around the X axis under the driving of the first rotating unit 1.

Next, the first rotation unit 1 will be specifically described.

Referring to fig. 4 and 5, the adjusting device 300 includes a fixed fixing frame 3, and the first rotating unit 1 is disposed on the fixing frame 3. Wherein the first rotating unit 1 has a first rotating portion 11 rotatable about the X-axis, the first rotating portion 11 having an inner side surface 111 close to its rotation axis and an outer side surface 112 distant from the rotation axis, it being understood that the inner side surface 111 is an upper surface of the first rotating portion 11, and the outer side surface 112 is a lower surface of the first rotating portion 11.

In a preferred manner, the inner side surface 111 and the outer side surface 112 have a circular arc shape with the same center above the inner side surface 111 in a cross section perpendicular to the X axis. Further preferably, in a cross section perpendicular to the X-axis and passing through the radiation source 101, the center of the inner side surface 111 and the outer side surface 112 is the isocenter 102.

Meanwhile, as a preferable mode, the first extension portion 31 extending in the X-axis direction and abutting against the inner side surface 111, and the second extension portion 32 and the third extension portion 33 extending in the X-axis direction and abutting against the outer side surface 112 are also fixedly provided on the fixing frame 3.

The second extension portion 32 and the third extension portion 33 are sequentially disposed at intervals along the rotation direction of the first rotation portion 11. In a preferred manner, the projection of the first extension portion 31 and the projection of the rotation axis of the first rotation portion 11 overlap each other on the plane in which the second extension portion 32 and the third extension portion 33 are located, and both fall between the second extension portion 32 and the third extension portion 33.

In other words, the first extension 31 is below the rotation axis of the first rotation part 11, and the second extension 32 and the third extension 33 are symmetrically distributed on both sides of the first extension 31 in a section perpendicular to the X axis. Thus, the first extending portion 31, the second extending portion 32 and the third extending portion 33 form a triangular structure attached to the upper and lower surfaces of the first rotating portion 11, and stable fixing and supporting can be provided for the first rotating portion 11, so that the first rotating portion 11 can perform reciprocating rotational movement between the first extending portion 31, the second extending portion 32 and the third extending portion 33.

Thus, a rotation rail as a first slide rail for the rotation of the first rotation portion 11 is formed between the first extension portion 31 and the second and third extension portions 32 and 33. The first rotation section 11 is provided in the rotation track, and when the rotation is performed in the X-axis direction, the inner side surface 111 always abuts against the first extension section 31, and the outer side surface 112 always abuts against the second extension section 32 and the third extension section 33.

Referring to fig. 5 and 6, the first rotating unit 1 further includes a first driving assembly 35 disposed on the fixing frame 3 for driving the first rotating portion 11. The first driving assembly 35 includes a first driving motor 351, a first screw 352 connected to an output end of the first driving motor 351, and a first nut 353 sleeved on the first screw 352.

Meanwhile, a motor fixing lever 34 for fixing the first driving motor 351 is fixedly provided on the fixing frame 3. The first rotating portion 11 is fixedly provided with a rotating portion fixing rod 114, the rotating portion fixing rod 114 is fixedly provided with a nut connecting member 115 in a sleeved manner, and the first nut 353 is fixedly connected with the nut connecting member 115.

In a preferred embodiment, the first screw 352 extends substantially in a direction perpendicular to the X-axis direction and parallel to the plane in which the second extending portion 32 and the third extending portion 33 are located. Thereby, the first driving motor 351 rotates the first screw shaft 352 and pushes the first nut 353 to perform a movement away from/toward the first driving motor 351 in the extending direction of the first screw shaft 352.

Further, the first nut 353 pushes the first rotating part 11 to move through the nut link 115 and the rotating part fixing lever 114. Since the inner side surface 111 and the outer side surface 112 of the first rotating portion 11 are both circular arc-shaped in the direction perpendicular to the X axis and respectively abut against the first extending portion 31, the second extending portion 32, and the third extending portion 33, when the first nut 353 applies a force to the first rotating portion 11 that is away from/close to the first driving motor 351 in the direction perpendicular to the X axis, the first rotating portion 11 is pushed to rotate about the X axis along the first slide rail formed between the first extending portion 31 and the second extending portion 32, and the third extending portion 33.

That is, the first rotation part 11 converts the translational force of the first nut 353 into rotation about the X-axis direction by the arc-shaped inner and outer side surfaces 111, 112 under the restriction of the first and second and third extensions 31, 32, 33. The first sliding rail formed by the first extending part 31, the second extending part 32 and the third extending part 33 has simple structure and convenient manufacture, reduces the contact area with the first rotating part 11, further reduces the friction force when the first rotating part 11 rotates, and improves the efficiency.

With continued reference to fig. 5 and 6, the second rotating unit 2 is fixedly connected to the first rotating part 11 through the connecting arm 20, and at the same time, one end of the support base 203 of the treatment couch 200, which is close to the rotating gantry 100, is fixedly connected to the second rotating unit 2. Therefore, when the first rotating part 11 rotates around the X-axis direction, the connecting arm 20 and the second rotating unit 2 drive the supporting base 203 to rotate around the X-axis direction, so that the pitching angle of the patient on the bed board 201 is adjusted, the deviation between the focus and the isocenter 102 is smaller, and the ray bundle and the focus are better aligned and shaped.

Referring to fig. 7, as described above, in a cross section perpendicular to the X-axis and passing through the radiation source 101, the inner side surface 111 and the outer side surface 112 of the first rotating portion 11 are preferably circular arcs centered on the isocenter 102. In other words, the first rotating portion 11 rotates about a rotation axis parallel to the X axis and passing through the isocenter 102. The patient-carrying couch 200 is driven by the first rotating part 11 to perform a pitching motion at a certain angle around the isocenter 102, and at this time, the distance between the couch 200 and the center of gravity 204 of the patient and the isocenter 102 is smaller than the radial distance between the isocenter 102 and the inner side surface 111 of the first rotating part 11, so that the first rotating unit 1 is equivalent to a labor-saving lever mechanism.

In other words, during the angle adjustment, the first screw 352 pushes the first rotating part 11 to rotate through the first nut 353, and in the case of rotating around the isocenter 102 by the same angle, the displacement amount of the first nut 353 is smaller than the displacement amount of the center of gravity 204, and the pushing force of the first screw 352 can push the treatment couch 200 to achieve the adjustment of the corresponding angle around the X-axis direction in the case of being smaller than the sum of the gravity of the treatment couch 200 and the patient. In practice, only the first driving motor 351 with power of tens of watts is needed to push the upper ton of the treatment couch 200 to rotate, and the device has simple structure, convenient operation and high efficacy.

Next, the second rotation unit 2 will be specifically described.

Referring to fig. 8, the adjusting device 300 further has a second rotating unit 2 rotating around the Z-axis direction. The second rotating unit 2 includes a second slide rail 21, a second driving motor 22, and a second slider 23, wherein a cross section of the second slide rail 21 perpendicular to the Z-axis direction is arc-shaped.

The second driving motor 22 is a linear motor, a stator part of which is fixed in the second motor sliding rail 21, and a rotor part of which is fixed on one side of the second sliding block 23 facing the second sliding rail 21, wherein the section of the stator part in the direction vertical to the Z axis is also arc-shaped which is matched with the second sliding rail 21. It should be understood that the second driving motor 22 is a linear motor, which means that the driving principle is the same as that of the linear motor, and the stator is actually circular along the second sliding rail 21, rather than linear.

The second slider 23 is engaged with the second slide rail 21, and can slide along the second slide rail 21. Meanwhile, the second slider 23 is fixedly connected with one end of the support base 203 of the therapeutic bed 200, which faces the rotating frame 100, and can be welded or fastened by bolts. Therefore, in the electrified working state, the rotor of the second driving motor 22 rotates around the Z axis along the stator, namely the track of the second sliding rail 21, and drives the second sliding block 23 to rotate along the second sliding rail 21, so as to drive the supporting base 203 to rotate around the Z axis, and finally, the bed board 201 is adjusted to rotate around the Z axis by a certain angle, so that the ray bundle is aligned and conformed with the focus more accurately.

It should be noted that, because the deviation angle between the beam and the focus is generally smaller, the adjustment angles of the first rotating unit 1 and the second rotating unit 2 do not need to be too large, for example, the actual adjustment requirements can be met by rotating about the X axis and the Z axis by 5 ° respectively, so that the strokes of the first driving motor 351 and the second motor slider 22 can be reduced during design, thereby simplifying the structure and saving the cost.

Pit

Next, the installation of the adjusting device 300 will be described with reference to fig. 9. Fig. 9 is an installation schematic of the adjusting device 300.

The radiation therapy linac includes an aerial part exposed to the ground and an underground part provided in the pit 400. The above-ground part includes a large part of the rotating gantry 100, the radiation source 101, and the like, and the above-ground part of the radiotherapy linac is engaged with the treatment couch 200 to examine or treat the patient. In addition, the subsurface portion includes a portion of the rotating gantry 100, and the like. That is, a portion of the rotating gantry 100 is submerged in the ground to serve to stabilize and support the above-ground portion.

Referring to fig. 9, in the installation process, a pit 400 matched with the adjusting device 300 is dug under the ground, the adjusting device 300 is installed in the pit 400 so that the top of the adjusting device 300 is leveled with the ground, and then a linear accelerator is installed above the adjusting device 300 so that one end of the support base 203 of the treatment couch 200 facing the rotating gantry 100 is fixedly connected with the adjusting device 300.

At this time, the whole adjusting device 300 is installed in the pit 400 below the linear accelerator, so that the adjusting device 300 is prevented from protruding outside, and the space occupied by the whole mechanism is effectively saved.

That is, in the present utility model, by disposing the adjusting device 300 in the pit 400, the space of the pit 400 can be effectively utilized, so that there is no need to additionally provide a space for accommodating the adjusting device 300. More specifically, by providing the adjustment device 300 in the pit 400 that the linac for radiation therapy originally has, the degree of freedom of rotation about the X-axis and the degree of freedom of rotation about the Z-axis can be provided by the adjustment device 300 in the pit 400 (see fig. 1 and 2). Also, the degree of freedom provided by the adjustment device 300 is transferred to the treatment couch 200 connected thereto and ultimately reflected in the treatment couch 200. Thus, 6 degrees of freedom for the patient are provided by multiple parties among the rotating gantry 100, the couch 200, and the adjustment apparatus 300, respectively.

In this way, compared with the case where, for example, the degree of freedom of rotation about the X-axis and the Z-axis is provided by the rotating gantry 100 or the couch 200, for example, the burden of the rotating gantry 100 or the couch 200 can be greatly reduced, and it is not necessary to additionally provide the installation space of the adjusting device 300 required for the degree of freedom, but the space of the existing pit 400 is utilized.

In particular, the adjustment device 300 is disposed in a pit 400 for receiving the subsurface portion of the linac for radiation therapy, and the degrees of freedom it provides are ultimately reflected in the treatment couch 200, rather than the rotating gantry 100. Thus, the movement of the rotating gantry 100 of the heavy linac can be prevented to the maximum extent while realizing the movement of 6 degrees of freedom, while more reasonably utilizing the space of the pit 400.

It should be understood that the above embodiments are only for explaining the present utility model, the protection scope of the present utility model is not limited thereto, and any person skilled in the art should be able to modify, replace and combine the technical solution and concept according to the present utility model within the scope of the present utility model.

Claims (9)

1. An adjustment device, characterized in that:

comprises a fixed frame and a first rotating unit arranged on the fixed frame;

the first rotating unit is provided with a first rotating part capable of rotating around a first direction, a first sliding rail arranged on the fixing frame and used for rotating the first rotating part, and a first driving assembly arranged on the fixing frame and used for driving the first rotating part;

the first rotating portion has an inner side surface close to a rotation axis thereof and an outer side surface away from the rotation axis, and in a cross section perpendicular to the first direction, the inner side surface and the outer side surface are in concentric circular arcs;

the first sliding rail comprises a first extension part which is abutted against the inner side surface and extends along the first direction, a second extension part which is abutted against the outer side surface and extends along the first direction, and a third extension part which is abutted against the inner side surface or the outer side surface and extends along the first direction;

the first rotating part rotates around the first direction respectively against the first extending part, the second extending part and the third extending part under the driving of the first driving component.

2. An adjustment device according to claim 1, characterized in that:

the third extension portion abuts the outer side surface;

and on the planes of the second extension part and the third extension part, the projection of the first extension part and the projection of the rotation axis of the first rotation part are overlapped with each other, and both the projections fall between the second extension part and the third extension part.

3. An adjustment device according to claim 2, characterized in that:

the first driving assembly comprises a first driving motor arranged on the fixing frame, a first screw rod connected with the output end of the first driving motor, and a first nut sleeved on the first screw rod, and the first nut is fixedly connected with the first rotating part.

4. An adjustment device according to claim 3, characterized in that:

the first lead screw extends in a direction substantially perpendicular to the first direction and parallel to a plane in which the second extending portion and the third extending portion are located;

the first driving motor drives the first screw rod to rotate and pushes the first nut to move away from/close to the first driving motor along the extending direction of the first screw rod, so that the first rotating part is pushed to rotate.

5. An adjustment device according to claim 1, characterized in that:

a second rotating unit rotating around a second direction perpendicular to the first direction;

the second rotating unit comprises a second sliding rail, a second driving motor and a second sliding block, and the section of the second sliding rail perpendicular to the second direction is arc-shaped;

and in a working state, the second driving motor drives the second sliding block to move along the second sliding rail.

6. The adjustment device of claim 5, wherein:

the second driving motor is a linear motor and comprises a stator fixed on the second sliding rail and a rotor fixed on one side of the second sliding block, which faces the second sliding rail;

under the working condition, the mover drives the second sliding block to move along the second sliding rail.

7. The adjustment device of claim 6, wherein:

the second sliding rail is fixedly connected with the first rotating part and can synchronously rotate around the first direction along with the first rotating part.

8. An accelerator for radiotherapy, which is characterized in that,

the accelerator for radiation therapy is provided with the adjusting device as claimed in any one of claims 1 to 7, and,

the accelerator for radiotherapy comprises an aerial part exposed to the ground and an underground part arranged in a pit, and the adjusting device is arranged in the pit.

9. The radiation therapy accelerator according to claim 8, wherein:

comprising an elongated bed plate, a bed support for supporting the bed plate, and an adjusting device according to any one of claims 1-7;

one end of the bed support device along the longitudinal direction of the bed plate is fixedly connected with the adjusting device of the radiotherapy accelerator.