CN111097107A

CN111097107A - Positioning mechanism and radiotherapy equipment

Info

Publication number: CN111097107A
Application number: CN201811260080.9A
Authority: CN
Inventors: 郭召; 张瑞荣
Original assignee: Shenzhen Our New Medical Technologies Development Co Ltd
Current assignee: Shenzhen Our New Medical Technologies Development Co Ltd
Priority date: 2018-10-26
Filing date: 2018-10-26
Publication date: 2020-05-05

Abstract

The invention discloses a positioning mechanism and radiotherapy equipment, the positioning mechanism comprises: two side supports respectively connected with two sides of the radiation head; a top support connected to the top of the side support; a first locator on the top support; and the second positioning parts are positioned at the top of the rack, wherein the first positioning parts correspond to the second positioning parts one to one. The positioning mechanism can improve the installation precision of the radiation head, and the radiation head with heavier weight does not need to be repeatedly disassembled and assembled in the installation process, so that the installation process is obviously simplified, and the installation difficulty is reduced.

Description

Positioning mechanism and radiotherapy equipment

Technical Field

The invention relates to the technical field of radiotherapy, in particular to a positioning mechanism and radiotherapy equipment.

Background

Gamma knife and medical linear accelerator are used as common radiotherapy equipment for tumor treatment. By way of example, a gamma knife includes: the radiation source focusing device comprises a machine frame and a focusing radiation head arranged on the machine frame, wherein a plurality of radiation sources are arranged on the focusing radiation head, and the mounting precision of the focusing radiation head is very necessary to ensure that the plurality of radiation sources are focused on an isocenter.

At present, a focusing radiation head is generally preliminarily mounted on a rack, trial-fit cushion blocks are arranged between guide rails on two sides of the focusing radiation head and mounting side plates of the rack on the same side, and the positions of the focusing radiation head on the rack are adjusted by selecting the trial-fit cushion blocks with different thicknesses so as to achieve good mounting accuracy.

The focusing radiation head needs to be repeatedly disassembled and assembled in the process, and the focusing radiation head is heavy and increases the installation difficulty.

Disclosure of Invention

In view of the above, the present invention provides a positioning mechanism and a radiotherapy apparatus, which can solve the above technical problems. Specifically, the method comprises the following technical scheme:

in one aspect, there is provided a positioning mechanism, comprising: two side supports respectively connected with two sides of the radiation head;

a top support connected to the top of the side support;

a first locator on the top support;

the second positioning piece is positioned at the top of the rack;

the first positioning pieces correspond to the second positioning pieces one to one.

In one possible implementation, the positioning mechanism further includes: an adjustment member;

the adjusting part is movably arranged in or on the first positioning part, and is provided with an installation hole matched with the second positioning part; alternatively, the first and second electrodes may be,

the adjusting piece is movably arranged in the second positioning piece or on the second positioning piece, and the adjusting piece is provided with an installation hole matched with the first positioning piece.

In a possible implementation manner, the first positioning element is connected with the second positioning element in an inserting manner, in a welding manner, in a bolt manner, or in a buckling manner.

In a possible implementation manner, the first positioning member is a positioning hole, and the second positioning member is a positioning pin;

or, the first positioning piece is a positioning pin, and the second positioning piece is a positioning hole.

In a possible implementation manner, the adjusting member is movably mounted on the positioning hole, and the positioning pin penetrates through the positioning hole and is fixed in the mounting hole of the adjusting member.

In a possible implementation manner, the first positioning element is a jack, and the second positioning element is an insertion block;

or, the first positioning piece is a jack, and the second positioning piece is an insert block.

In one possible implementation, the adjusting member includes: the adjusting body is movably positioned inside the jack and provided with the mounting hole;

and the fixing body is connected with the end part of the adjusting body and is used for fixing the adjusting body in the jack.

In one possible implementation, the positioning mechanism further includes: and the two ends of the reinforcing support are respectively connected with the two side supports.

In one possible implementation, the positioning mechanism further includes: the positioning support is connected with the rack and positioned between the side support and the rack;

the thickness of the positioning support is adjustable.

In one possible implementation, the positioning mechanism further includes:

the unloading support is connected with the rack and positioned between the side support and the rack, and the thickness of the unloading support is adjustable;

the unloading support is provided with a rolling piece which is used for forming rolling friction with the side support.

In another aspect, there is provided a radiotherapy apparatus comprising: any of the above-described positioning mechanisms;

a radiation head coupled with a side support of the positioning mechanism;

and the rack is connected with the first positioning piece on the top support through the second positioning piece of the positioning mechanism.

The technical scheme provided by the embodiment of the invention has the beneficial effects that at least:

the positioning mechanism provided by the embodiment of the invention can be used for mounting and positioning the radiation head in the radiotherapy device, when the positioning mechanism is used, two sides of the radiation head are connected with the side supports of the positioning mechanism, and then the radiation head is integrally placed in the mounting position of the rack of the radiotherapy device for mounting, wherein the top of the rack is provided with the second positioning piece, the first positioning piece and the second positioning piece on the top support are in one-to-one correspondence, and are matched with each other, so that the position positioning of the radiation head on the rack is realized, and the mounting precision is improved. After the positioning is finished, the radiation head is connected with the rack, and the position of the radiation head on the rack is fixed. Therefore, by using the positioning mechanism provided by the embodiment of the invention, the mounting precision of the radiation head can be improved, and the radiation head with heavier weight does not need to be repeatedly dismounted in the mounting process, so that the mounting process is obviously simplified, and the mounting difficulty is reduced.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1-1 is a schematic structural diagram of a positioning mechanism according to an embodiment of the present invention;

fig. 1-2 are schematic structural views of a positioning mechanism provided with an adjusting member according to an embodiment of the present invention;

fig. 1-3 are schematic structural views of another positioning mechanism according to an embodiment of the present invention, in which the positioning support and the unloading support in fig. 1-3 are not mounted on the side support, but are attached to the side support;

FIG. 2 is a schematic structural diagram of a radiotherapy apparatus provided by an embodiment of the present invention;

FIG. 3 is a schematic structural view of a frame;

FIG. 4 is a schematic structural diagram of a positioning support according to an embodiment of the present invention;

FIG. 5 is a schematic view of the operation relationship between the positioning support and the side support according to the embodiment of the present invention;

fig. 6 is a schematic structural diagram of an unloading support provided in an embodiment of the present invention.

The reference numerals denote:

1-side support, 101-connecting groove,

2-top support, 201-first positioning member, 202-second positioning member, 203-adjusting member,

3-positioning support, 301-first fixed block, 302-first thickness regulating block,

4-unloading support, 401-rolling element, 4011-fixed body, 4012-ball,

402-a second fixed block, 403-a second thickness adjusting block,

5-reinforcing support, 6-via hole, 7-first driving piece, 8-second driving piece, 9-reinforcing block,

m-radiation head, N-frame, P-installation side plate.

Detailed Description

In order to make the technical solutions and advantages of the present invention clearer, the following will describe embodiments of the present invention in further detail with reference to the accompanying drawings.

It should be noted that, for the radiotherapy device, the radiation head includes but is not limited to: the treatment head, the imaging head and the like are arranged on the stand by the radiation head, and the stand is correspondingly provided with an installation position for accommodating the radiation head. Typically, the gantry mounting location has two mounting side plates for attachment to two sides of the radiation head (typically two side rails). It will be appreciated that the corresponding radiation heads are named differently depending on the particular radiation treatment apparatus, for example, for a gamma knife, the radiation head is referred to as a focus treatment head, and for a linear accelerator, the radiation head is an accelerator treatment head.

Based on the above structure of the radiation head and the frame, the embodiment of the present invention provides a positioning mechanism for facilitating the installation and positioning of the radiation head, and the structure is summarized as follows:

in one aspect, an embodiment of the present invention provides a positioning mechanism, as shown in fig. 1-1 and fig. 3, the positioning mechanism includes: two side supports 1 respectively connected with both sides of a radiation head M of the radiotherapy apparatus; a top support 2 connected with the top of the side support 1; a first locator 201 located on the top support 2; and the second positioning part 202 is positioned at the top of the rack N of the radiotherapy equipment, wherein the first positioning parts 201 correspond to the second positioning parts 202 one by one.

The positioning mechanism provided by the embodiment of the invention can be used for installing and positioning the radiation head M in the radiotherapy device, when in application, two sides of the radiation head M are connected with the side supports 1 of the positioning mechanism, and then the radiation head M is integrally placed in the installation position of the rack N of the radiotherapy device for installation, wherein the second positioning part 202 is arranged at the top of the rack N, and the first positioning parts 201 and the second positioning parts 202 on the top support 2 are firstly in one-to-one correspondence and are matched with each other, so that the position positioning of the radiation head M on the rack N is realized, and the installation precision is improved. After the positioning is completed, the radiation head M is connected with the rack N, so that the position of the radiation head M on the rack N is fixed. Therefore, by using the positioning mechanism provided by the embodiment of the invention, the mounting precision of the radiation head M can be improved, and the radiation head M with heavier weight does not need to be repeatedly dismounted in the mounting process, so that the mounting process is obviously simplified, and the mounting difficulty is reduced.

The number of first detents 201 on the same top support 201 may be more than one, e.g., two, three, etc. It is understood that the number of the second positioning members 202 is the same as the number of the first positioning members 201.

As mentioned above, the positioning of the radiation head M in the installation process is realized by the first positioning member 201 corresponding to the second positioning member 202, and the positioning manner between the two includes, but is not limited to: plug-in connections, bolted connections, welded connections, snap connections, etc., and plug-in connections may be selected for quick and efficient connection. The following are described with respect to the above several connection methods, respectively:

to bolted connection mode, first setting element 201 and second setting element 202 can be the bolt hole, and during the application, make first setting element 201 and second setting element 202 one-to-one switch on, adopt bolt and both threaded connection, can realize effective location.

To the welding connection mode, first setting element 201 and second setting element 202 can be the signpost, during the application, make first setting element 201 and second setting element 202 one-to-one overlap, then will top and support 2 and the welding of frame N top, can realize effective location.

To buckle connection mode, first setting element 201 can be the draw-in groove, and second setting element 202 can be the clamp, and during the application, make second setting element 202 card go into in first setting element 201, can realize effective location.

As for the plug connection mode, it has the advantages of simple, fast and reliable positioning mode, as an example, the first positioning element 201 is a jack, and the second positioning element 202 is a plug, which certainly does not exclude the case that the first positioning element 201 is a plug, and the second positioning element 202 is a jack.

Generally, the structure of the insert block is adapted to the insertion hole, for example, when the insertion hole is a circular hole, the insert block is a cylindrical block; when the jacks are rhombic holes, the insertion blocks are rhombic columns.

As another example, the first positioning member 201 is a positioning hole, and the second positioning member 202 is a positioning pin;

alternatively, the first positioning member 201 is a positioning pin, and the second positioning member 202 is a positioning hole.

Wherein, the outline of the insert block (or the positioning pin) can be just matched with the inner outline of the insert hole (or the positioning hole) so as to achieve the stable positioning effect. The volume of the outer contour of the insert (or the positioning pin) may also be smaller than the volume of the inner contour of the insert (or the positioning hole), for example, the radial width of the insert (or the positioning hole) may be larger than the radial width of the insert (or the positioning pin), in this case, as shown in fig. 1-2, in the embodiment of the present disclosure, the top of the rack N may be used to support the top support 2, that is, the top support 2 may be attached to the top wall of the rack N when in use.

Further, as shown in fig. 1-2, the positioning mechanism provided in the embodiments of the present disclosure further includes: and the adjusting part 203, wherein the adjusting part 203 is movably installed in the first positioning part 201 or on the first positioning part 201, and the adjusting part 203 is provided with an installation hole matched with the second positioning part 202. Alternatively, the first and second electrodes may be,

the adjusting member 203 is movably mounted in the second positioning member 202 or on the second positioning member 202, and the adjusting member 203 has a mounting hole adapted to the first positioning member 201.

By making the adjusting member 203 movable in or on one of the positioning members, the position of the radiation head M on the gantry N can be further appropriately adjusted to ensure higher mounting accuracy. The first positioning member 201 and the second positioning member 202 can be relatively fixed by providing a mounting hole on the adjusting member 203 for fitting with another positioning member.

For example, when the mating manner between the first positioning member 201 and the second positioning member 202 is the insertion between the insertion hole and the insertion block, the adjusting member 203 may include: the adjusting body is movably positioned in the jack and is provided with a mounting hole; and the fixing body is connected with the end part of the adjusting body and is used for fixing the adjusting body in the jack.

The position of the radiation head M on the gantry N is finally adjusted by adjusting the body to move within the receptacle. By means of the fixing body, after the above-mentioned positional relationship is determined, the adjusting member 203 is fixed with respect to the inside of the insertion hole, thereby ensuring that the radiation head M is fixed with respect to the chassis N.

The fixing body may be a plate-like structure surrounding the end of the adjustment body, in which case the fixing body may be fixed to the top support by means of screws to fix the adjustment member 203 relative to the insertion hole.

For example, when the first positioning element 201 and the second positioning element 202 are matching positioning holes and positioning pins, the adjusting element 203 is movably mounted on the positioning holes, and the positioning pins are fixed in the mounting holes of the adjusting element 203 through the positioning holes. For example, as shown in fig. 1 to 2, the adjusting member 203 may have a plate shape and may be attached to the plate surface around the positioning hole by a screw or the like.

As can be seen from the above, the two side supports 1 may be separate and relatively independent, and in order to simplify the structure and increase the strength of the positioning mechanism, as shown in fig. 1-1, the positioning mechanism further includes: and the two ends of the reinforcing support 5 are respectively connected with the two side supports 1.

For example, the reinforcing support 5 may be a link structure, and may be configured as one or two, and both ends are respectively connected with the same side ends of the two side supports 1.

Further, the length of the reinforcing support 5 can be adjusted to adapt the positioning mechanism to various specifications of the radiation head M.

After the radiation head M is accurately positioned relative to the frame N, the radiation head M and the frame N are fastened and connected conventionally, and generally, the guide rail of the radiation head M and the mounting side plate P of the frame N are connected through a connecting screw. The second positioning member 202 may be disposed on the top of the mounting side plate P.

Considering that the side support 1 is clamped between the guide rail and the mounting side plate P in the application state, the side support 1 has a through hole 6 for passing a connection screw of the housing N and the radiation head M therethrough, as shown in fig. 4.

The side support 1 may be used to connect with the guide rails on both sides of the radiation head M, and a connection groove adapted to the shape of the guide rail may be provided on the side support 1 according to the shape of the guide rail. Under general situation, the guide rail of radiation head M both sides is half circular arc, at this moment, can set up half circular arc's spread groove 101 on collateral branch support 1, and the guide rail card is gone into and is tentatively fixed a position in spread groove 101, adopts the fastener afterwards, for example the screw connect can, so set up, do benefit to improvement joint strength and simplify the connection degree of difficulty.

Further, as shown in fig. 1 to 3, the positioning mechanism provided in the embodiment of the present invention further includes: the positioning support 3 is connected with the frame N and is positioned between the side support 1 and the frame N; the thickness of the positioning support 3 is adjustable.

During application, after the radiation head M and the rack N are accurately positioned by the first positioning part 201 and the second positioning part 202, the radiation head M is initially installed on the rack N. Because the positioning support 3 is connected with the frame N, the positioning support 3 is positioned between the side support 1 and the frame N at the moment, and the thickness of the positioning support 3 is adjusted until the installation gap between the side support 1 and the frame N is eliminated, namely, the side support 1 and the positioning support 3 are tightly attached to each other, at the moment, the positioning support 3 can be utilized to provide lateral support for the radiation head M, so that the installation rigidity of the radiation head M is effectively improved. Subsequently, the radiation head M may be subsequently fastened to the gantry N.

Further, as shown in fig. 1 to 3, the positioning mechanism further includes: the unloading support 4 is connected with the rack N and positioned between the side support 1 and the rack N, and the thickness of the unloading support 4 is adjustable; the unloading support 4 has a rolling member 401 thereon, and the rolling member 401 is used to form rolling friction with the side support 1.

The unloading support 4 and the positioning support 3 are matched and can be used for the disassembling and reassembling processes of the radiation head M. When the radiation head M is detached, the gantry N is rotated such that the radiation head M is located at a side portion of the gantry N (i.e., a central axis of the radiation head M extends in a horizontal direction). First, the preliminary positioning of the gantry N and the radiation head M is released. The thickness of the spacer 3 between the frame N and the radiation head M is then adjusted until the mounting clearance between the side support 1 and the frame N is restored, i.e. the spacer 3 is spaced from the side support 1 to facilitate disassembly. Subsequently, the thickness of the unloading support 4 between the gantry N and the radiation head M is adjusted to eliminate the installation gap between the side support 1 and the gantry N, and the unloading support 4 is used to provide lateral support for the radiation head M to maintain a good positioning with respect to the gantry N (this process is equivalent to switching the positioning support 3 to the unloading support 4). Since the unloading support 4 has the rolling member 401, the rolling member 401 is configured to form rolling friction with the side support 1, and the radiation head M can be smoothly pulled out from the gantry N by the radiation head detaching tool after the fastening connection between the radiation head M and the gantry N is released based on the rolling friction (it is understood that the radiation head M is pulled out from the gantry N together with the side support 1 and the top support 2 connected thereto). When the radiation head M is remounted, the mounting precision of the remounted radiation head M can be ensured only by returning the original path and switching the unloading support 4 into the positioning support 3.

It can be seen that by switching the positioning support 3 and the unloading support 4, the mounting state of the radiation head M (the positioning support 3 is in operation) can be switched to the dismounting state (the unloading support 4 is in operation), and by the above switching, it can be ensured that the radiation head M can always maintain good mounting accuracy when being mounted again after being dismounted. On the premise of keeping the installation precision, the radiation head M is detached from the rack N, so that various operations of the radiation head M, such as component maintenance, source replacement and the like, are more convenient and feasible, the radiation head M has important significance for reducing the size and the cost of radiotherapy equipment, and the product competitiveness is effectively improved.

The positioning support 3 and the unloading support 4 may be connected with the mounting side plate P of the frame N. In the embodiment of the present invention, the positioning support 3 can effectively improve the rigidity of the radiation head M during installation, and can stably support the radiation head M in a lateral direction in a use state. In order to achieve the adjustable thickness of the positioning support 3, the following outlines its applicable structure:

illustratively, as shown in fig. 4, the positioning support 3 includes: a first fixing block 301 connected to the frame N, for example, a mounting side plate P thereof; and a first thickness adjusting block 302 sliding with respect to the first fixing block 301. Further, as shown in fig. 2, the mounting mechanism further comprises: and the first driving piece 7 is used for driving the first thickness adjusting block 302 to slide bidirectionally.

In the application process, the first fixing block 301 can be fixedly connected to the mounting side plate P of the rack N, the first thickness adjusting block 302 and the first fixing block 301 form a sliding pair, the first driving piece 7 drives the first thickness adjusting block 302 to slide along the first fixing block 301 in two directions, the thickness of the positioning support 3 can be increased or reduced, and therefore the purpose of eliminating or recovering the mounting gap between the side support 1 and the mounting side plate P of the rack N is achieved.

For the sliding of the first thickness adjusting block 302 relative to the first fixing block 301, a sliding groove and a sliding rail may be disposed on the contact surface between the first thickness adjusting block 302 and the first fixing block 301, for example, the sliding rail may be disposed on the first thickness adjusting block 302, the sliding groove may be disposed on the first fixing block 301, and the above-mentioned relative sliding may be achieved through the cooperation of the sliding rail and the sliding groove. It will be appreciated that the length of the slide channel is greater than the length of the slide rail to facilitate bi-directional sliding movement of the first thickness adjustment block 302.

In consideration of the fact that the first fixing block 301 is tightly attached to the mounting side plate P of the frame N and the first thickness adjusting block 302 needs to be tightly attached to the side support 1 (see fig. 5), when the side support 1 is a planar plate-shaped structure, it is desirable that the surface to which the first thickness adjusting block 302 is attached is also planar. In this way, in order to achieve the purpose of changing the thickness while the first thickness adjusting block 302 slides in two directions (for example, up and down), and also ensure that the first fixing block 301 and the first thickness adjusting block 302 are always tightly attached to each other, in the embodiment of the present invention, as shown in fig. 4, the first fixing block 301 and the first thickness adjusting block 302 are wedge-shaped blocks which are matched with each other, so that the first thickness adjusting block 302 can be wedged tightly against the side support 1 to form a side support.

For example, the first fixing block 301 may be a wedge-shaped block with a rectangular profile, the thickness of which may gradually decrease from the top to the bottom, and the first thickness adjusting block 302 may also be a wedge-shaped block with a rectangular profile, the thickness of which may gradually increase from the top to the bottom. That is, the abutting surfaces of the first fixing block 301 and the first thickness adjusting block 302 are inclined surfaces adapted to each other.

As mentioned above, the first driving member 7 is used to drive the bidirectional sliding of the first thickness adjusting block 302, as an example, the first driving member 7 may be screwed with the first thickness adjusting block 302, and the bidirectional sliding of the first thickness adjusting block 302 may be realized by rotating the first driving member 7 in situ and changing the rotating direction.

The first driving member 7 can be limited on the top support 2 to ensure the in-situ rotation. For example, the first driving member 7 may be a bolt, which may pass through the top support 2 to be in threaded connection with the first thickness adjusting block 302, and may be always limited on the top support 2 based on the limiting function of the head thereof, so as to achieve the purpose of being rotatable but not axially movable. Meanwhile, when the bolt is adopted, the position of the first thickness adjusting block 302 can be kept unchanged, and the side support 1 and the mounting side plate P of the frame N are always in a wedged state.

Further, a reinforcing block 9 may be provided on the top support 2, and the first driving member 7 is screwed to the first thickness-adjusting block 302 through both the reinforcing block 9 and the top support 2, which may increase the strength at the connection position. Wherein the reinforcing block 9 may be a plate-like structure.

For the unloading support 4, it can be located on two mounting side plates P of the frame N at the same time, or only one of the mounting side plates P, and considering that a good unloading effect can be achieved even if it is located on only one side, in the embodiment of the present invention, the unloading support 4 can be only located on the mounting side plate P on one side of the frame N.

As mentioned above, the unloading support 4 is used for laterally supporting the radiation head M when the radiation head M is detached, and in order to realize the adjustable thickness of the unloading support 4, the following is summarized as an applicable structure:

illustratively, as shown in fig. 6, the unloading support 4 includes: a second fixing block 402 connected to the frame N, for example, a mounting side plate P thereof; and a second thickness adjusting block 403 sliding with respect to the second fixing block 402. Wherein the rolling member 401 is located on the second thickness adjustment block 403.

Further, the mounting mechanism further comprises: and a second driving member 8 for driving the second thickness adjusting block 403 to slide bidirectionally.

In the application process, the second fixing block 402 can be fixedly connected to the mounting side plate P of the frame N, the second thickness adjusting block 403 and the second fixing block 402 form a sliding pair, the second driving piece 8 drives the second thickness adjusting block 403 to bidirectionally slide along the second fixing block 402, so that the thickness of the unloading support 4 can be increased or reduced, and the purpose of eliminating or restoring the gap between the side support 1 and the mounting side plate P of the frame N is achieved.

The relative sliding manner between the second thickness adjusting block 403 and the second fixing block 402 can be described in the above description of the first thickness adjusting block 302 and the first fixing block 301, and is not described herein again. In addition, the second fixing block 402 and the second thickness adjusting block 403 may also be wedge-shaped blocks that are matched with each other.

The second driving member 8 is connected with the second thickness adjusting block 403 by screw threads, so as to achieve the purpose of making the second thickness adjusting block 403 slide in two directions. The second drive element 8 can also be a bolt, for example.

Likewise, the second driving member 8 may also be threaded through both the reinforcing block 9 and the top support 2 to the second thickness adjustment block 403 to increase the strength at the connection location. In this way, the unloading supports 4 can be arranged adjacent to the positioning supports 3 on the same side.

In the embodiment of the present invention, the rolling member 401 is used to form rolling friction with the side support 1, and as an example, the rolling member 401 includes: a fixed body 4011 fixed to the second thickness adjusting block 403, and a plurality of balls 4012 rotatably provided on the fixed body 4011. The rolling balls 4012 form rolling friction with the side support 1. It will be appreciated that the structure of the rolling members 401 may be referred to the structure of the abacus and will not be described in detail herein.

In order to optimize the functions of the positioning support 3 and the unloading support 4, a plurality of positioning supports 3 and unloading supports 4 may be provided at the same time, and in one possible implementation, a plurality of positioning supports 3, for example, 2, 3 (see fig. 1), 4, etc., may be provided on the mounting side plate P on each side of the frame N. Meanwhile, on the mounting side plate P on either side of the frame N, a plurality of unloading supports 4, for example, 2, 3 (see fig. 1), 4, or the like, may be provided.

In another aspect, an embodiment of the present invention further provides a radiotherapy apparatus, including: any one of the positioning mechanisms provided by the embodiment of the invention;

the radiation head is connected with the side support;

and the rack is connected with the first positioning piece on the top support through a second positioning piece of the positioning mechanism.

With respect to the radiotherapy apparatus provided above, the following is set forth with respect to the process of mounting and dismounting the radiation head thereof:

mounting of the radiation head:

firstly, the first fixing block of the positioning support of the positioning mechanism is connected with the mounting side plate of the rack, so that the two side supports of the positioning mechanism are connected with the guide rails on the two sides of the radiation head, and then the top support and the top of the mounting side plate of the rack are positioned through the first positioning piece and the second positioning piece, so that the preliminary mounting of the radiation head on the rack is realized.

The first thickness adjusting block is driven to move through the first driving piece, so that the thickness of the positioning support is increased until the mounting gap between the side support and the mounting side plate of the rack is eliminated, namely, the first thickness adjusting block is wedged with the side support, the positioning support is utilized to provide lateral support for the focusing radiation head, and the focusing radiation head is accurately positioned relative to the rack. Then, the guide rail of the focusing radiation head is tightly connected with the mounting side plate of the frame by using the connecting screw. The installation process can obtain good installation precision, and ensures that a plurality of radioactive sources on the focusing radiation head are always focused on the isocenter.

Disassembling the radiation head:

the rotating gantry support rotates the gantry such that the radiation head is positioned at a lateral portion of the gantry (i.e., a central axis of the radiation head extends in a horizontal direction). And (4) removing the pin at the top of the side plate, and removing the primary positioning of the rack and the radiation head.

Through the first thickness regulating block reverse motion of first driving piece drive, make the thickness of location support reduce, support the installation clearance between the installation curb plate of frame until recovering the side, promptly, make first thickness regulating block and side support separation to convenient the dismantlement. Then, the thickness of the unloading support between the mounting side plate of the rack and the guide rail of the focusing radiation head is adjusted, specifically, the second thickness adjusting block is driven by the second driving element to slide along the second fixing block, so that the thickness of the unloading support is increased to eliminate the gap between the side support and the mounting side plate of the rack (i.e., the second thickness adjusting block is wedged with the side support), and the unloading support is used for providing the side support for the focusing radiation head, so that the focusing radiation head is well positioned relative to the rack (the process is equivalent to switching the side support into the unloading support). Because the unloading support is provided with the rolling part which is used for forming rolling friction with the side support, based on the rolling friction, after the fastening connection between the focusing radiation head and the rack is released, the radiation head can be smoothly pulled out from the rack by using the radiation head dismounting tool (as can be understood, the radiation head is pulled out of the rack together with the side support and the top support of the positioning mechanism). When the radiation head is remounted, the installation precision of the remounted radiation head can be ensured only by returning the original path and switching the unloading support into the side support.

The radiation head dismounting tool and the operation process thereof for dismounting and mounting the radiation head are common in the art, and are exemplified as follows:

the base of the radiation head dismounting tool is fixed on the foundation at the side part of the frame and is reliably connected with the foundation through a screw. The radiation head dismounting tool has three linear motions in orthogonal directions and is used for adjusting the posture of the radiation head, and the radiation head dismounting tool is connected with the rack to keep the balance of the rack in the dismounting process. The horizontal guide rail on the radiation head dismounting tool extends into the lower part of the guide rail of the radiation head in the rack.

In the dismounting process, the height of the dismounting tool of the radiation head is adjusted, so that the upper horizontal guide rail is tightly attached to the guide rail of the radiation head, and the radiation head is lifted together with the unloading support. And the horizontal screw rod on the radiation head dismounting tool is fixed through the adapter plate and the guide rail of the radiation head. The radiation head can be moved out of the rack along the horizontal direction by manually cranking the horizontal screw rod.

The above description is only for facilitating the understanding of the technical solutions of the present invention by those skilled in the art, and is not intended to limit the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A positioning mechanism, characterized in that the positioning mechanism comprises: two side supports (1) respectively connected with two sides of the radiation head (M);

a top support (2) connected with the top of the side support (1);

a first positioning element (201) located on the top support (2);

a second positioning member (202) positioned at the top of the frame (N);

the first positioning parts (201) correspond to the second positioning parts (202) one by one.

2. The positioning mechanism of claim 1, further comprising: an adjustment member (203);

the adjusting piece (203) is movably arranged in the first positioning piece (201) or on the first positioning piece (201), and a mounting hole matched with the second positioning piece (202) is formed in the adjusting piece (203); alternatively, the first and second electrodes may be,

the adjusting piece (203) is movably arranged in the second positioning piece (202) or on the second positioning piece (202), and the adjusting piece (203) is provided with a mounting hole matched with the first positioning piece (201).

3. The positioning mechanism according to claim 1 or 2, wherein the first positioning member (201) is connected with the second positioning member (202) by means of a plug connection, a welded connection, a bolt connection, or a snap connection.

4. The positioning mechanism according to claim 3, wherein the first positioning member (201) is a positioning hole and the second positioning member (202) is a positioning pin;

or, the first positioning part (201) is a positioning pin, and the second positioning part (202) is a positioning hole.

5. The positioning mechanism according to claim 4, wherein the adjusting member (203) is movably mounted to the positioning hole, and the positioning pin is fixed in the mounting hole of the adjusting member (203) through the positioning hole.

6. The positioning mechanism according to claim 3, wherein the first positioning member (201) is a socket and the second positioning member (202) is a block;

or, the first positioning piece (201) is a jack, and the second positioning piece (202) is an insert block.

7. The positioning mechanism according to claim 6, wherein the adjustment member (203) comprises: the adjusting body is movably positioned inside the jack and provided with the mounting hole;

8. The positioning mechanism of claim 1, further comprising: and the two ends of the reinforcing support (5) are respectively connected with the two side supports (1).

9. The positioning mechanism of any of claims 1-7, further comprising: a positioning support (3) connected with the frame (N) and positioned between the side support (1) and the frame (N);

the thickness of the positioning support (3) is adjustable.

10. The positioning mechanism of claim 8, further comprising:

the unloading support (4) is connected with the rack (N) and positioned between the side support (1) and the rack (N), and the thickness of the unloading support (4) is adjustable;

the unloading support (4) is provided with a rolling piece (401), and the rolling piece (401) is used for forming rolling friction with the side support (1).

11. A radiotherapy apparatus, characterized in that it comprises: the positioning mechanism of any one of claims 1-10;

a radiation head coupled with a side support of the positioning mechanism;