WO2018133575A1

WO2018133575A1 - Beam blocking mechanism used in rotary accelerator proton heavy ion medical apparatus

Info

Publication number: WO2018133575A1
Application number: PCT/CN2017/115351
Authority: WO
Inventors: 韩曼芬; 宋云涛; 郑金星; 沈俊松; 金小飞; 张午权; 支博
Original assignee: 合肥中科等离子医学技术装备有限公司
Priority date: 2017-01-19
Filing date: 2017-12-09
Publication date: 2018-07-26
Also published as: CN106823160B; CN106823160A

Abstract

Disclosed is a beam blocking mechanism used in a rotary accelerator proton heavy ion medical apparatus, the beam blocking mechanism comprising a vacuum chamber (8) and a blocking block driving structure, wherein an upper side face of the vacuum chamber (8) is provided with a vacuum chamber cover plate (9); the blocking block driving structure is mounted on the vacuum chamber cover plate (9) and comprises a blocking block (23); an aluminium profile groove (15) is provided on the vacuum chamber cover plate (9), with a gas cylinder (14) being mounted at an upper part of the aluminium profile groove (15) via a gas cylinder holder (16), a linear guide rail (17) being fixed at a central part via a guide rail fixing plate (18) provided in a sliding manner, and a piston rod bushing (13) being mounted on the linear guide rail (17); an upper end of the piston rod bushing (13) is connected in a threaded manner to a piston rod of the gas cylinder (14); and the blocking block (23) is located in the vacuum chamber (8), a lower connecting rod (24) is welded at a lower end of the piston rod bushing (13), and the lower connecting rod (24) is connected in a threaded manner to the blocking block (23).The beam blocking mechanism used in a rotary accelerator proton heavy ion medical apparatus can realise a fast blocking function on an abnormal proton heavy ion beam without affecting the normal operation of other components, thereby guaranteeing the safety of patients and medical personnel.

Description

Beam blocking mechanism for use in a cyclotron proton heavy ion medical device

Technical field

The invention belongs to the technical field of proton heavy ion medical device engineering, and in particular relates to a beam blocking mechanism used in a cyclotron proton heavy ion medical device.

Background technique

The criteria for radiotherapy (radiotherapy) are to achieve maximum tumor control probability and minimal normal organ tissue damage rate, affecting the efficacy and accuracy of radiotherapy including lesion diagnosis, treatment plan, ray and target location method, dose given The grading, but more important factor is the type of radiating particles, commonly used include X-rays, gamma rays, proton beams, and heavy ion beams such as helium and carbon. Compared with traditional X-rays, γ-rays, etc., proton heavy ion treatment can point the peak part to the tumor lesion, which has the advantages of strong penetrating power, small damage to surrounding normal tissue, short treatment time, etc. Ion therapy has also been recognized by the medical community as a superior radiotherapy method.

The proton heavy ion medical device using the cyclotron as the host is the development trend and popular research direction of the current tumor treatment system. It is mainly composed of an accelerator, a rotating frame, a fixed treatment room and a series of beam transmission components. The beam blocking mechanism is used as a kind of beam-transporting component, and is mainly used for quickly cutting off the local beam after the host computer control system issues a beam abnormality command, and ensures that all the operating processes are performed under a closed vacuum condition. There is no beam diffusion and leakage, which guarantees the safety of cancer patients and medical staff to a large extent.

In order to improve the operational reliability of proton heavy ion medical devices, a new solution is now available.

Summary of the invention

It is an object of the present invention to provide a beam blocking mechanism for use in a cyclotron proton heavy ion medical device that meets the requirements for reliability and accuracy during tumor treatment.

The object of the present invention can be achieved by the following technical solutions:

A beam blocking mechanism for a cyclotron proton heavy ion medical device, comprising a vacuum chamber, a vacuum chamber supporting structure, a mounting height adjusting structure, and a blocking block driving structure, wherein the vacuum chamber upper side is provided with a vacuum chamber cover The block driving structure is mounted on the vacuum chamber cover, including the blocking block;

An aluminum slot is mounted on the vacuum chamber cover, a cylinder is mounted on the upper portion of the aluminum slot through the cylinder bracket, and a linear guide rail is fixed on the rail fixing plate in the middle, and a piston rod sleeve is mounted on the linear guide; The upper end of the piston rod sleeve is screwed to the piston rod of the cylinder;

The blocking block is located in the vacuum chamber, and the lower end of the piston rod sleeve is welded with a lower connecting rod, and the lower connecting rod is screwed with the blocking block.

The vacuum chamber support structure includes a bottom support plate, a pair of vertical lateral support plates that are parallel to each other and bolted to the bottom support plate, a central support plate that is fixed between the two side support plates by a screw connection, and An upper support plate parallel to the bottom support plate.

The installation height adjusting structure comprises an adjusting bolt, a nut and a vacuum cavity fixing plate. The bottom of the adjusting bolt is mounted on the upper supporting plate, and the upper part is mounted with a vacuum cavity fixing plate through a nut, and the vacuum cavity fixing plate is connected to the vacuum cavity by screws.

A reinforcing plate and a thick bracket are respectively mounted on two sides of the bottom of the aluminum groove, and are respectively fixed on the vacuum cavity and the vacuum chamber cover.

The vacuum chamber cover is provided with a through hole, and the vacuum chamber cover is welded to the blade flange through the well pipe; the blade flange is connected to the piston rod sleeve through the bellows.

The lower connecting rod is also connected with an H-shaped insulating rod by bolts, and the insulating rod is made of G10 material.

The blocking block is further provided with a socket for mounting a current lead, and a hole is reserved in the vacuum chamber cover for installing the aviation socket.

A fixed position bracket and a limit switch are mounted on the rail fixing plate.

The air cylinder interface is installed on the cylinder block, and the interface is connected to the air source system through a hose, and the air source system is controlled by the PLC.

The workflow of the beam blocking mechanism is:

The air source interface installed on the cylinder block of the cylinder is connected to the air source system through a hose, and the air source system is controlled by the PLC;

When the PLC receives the beam abnormality signal, the control system issues a beam blocking command, and the compressed air enters the cylinder and pushes the piston rod to move, thereby pushing the movement of the lower connecting rod and the blocking block, and the bellows is in a compressed state;

When the blocking block reaches the beam pipe, the limit switch transmits the in-position signal to the PLC control system, the cylinder stops the intake, and the mechanism stops.

The invention has the beneficial effects that the invention can quickly cut off the local beam current and ensure that all the operation processes are carried out under a closed vacuum condition without any beam diffusion and leakage, thereby ensuring the tumor to a large extent. The safety of patients and health care workers;

The vacuum chamber of the invention stops the block at the position of the beam channel driven by the cylinder and feeds the displacement information back to the control system, and can stop the abnormal proton heavy ion beam flow without affecting the normal operation conditions of other components. The ability to quickly block, thus ensuring the safety of patients and health care workers.

DRAWINGS

In order to facilitate the understanding of those skilled in the art, the present invention will be further described below in conjunction with the accompanying drawings. In order to facilitate the understanding of those skilled in the art, the present invention will be further described below in conjunction with the accompanying drawings.

Figure 1 is a perspective view showing the overall structure of the present invention;

2 is a schematic perspective view of a block driving structure in the overall structure of the present invention;

3 is a schematic perspective view showing the three-dimensional structure of the linear guide in the blocker driving structure in the overall structure of the present invention;

4 is a schematic view showing the internal structure of a bellows and a vacuum chamber in the overall structure of the present invention.

Preferred embodiment of the invention

The technical solutions of the present invention will be described clearly and completely hereinafter with reference to the embodiments. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

A beam blocking mechanism for a cyclotron proton heavy ion medical device, as shown in FIGS. 1-3, comprising a vacuum chamber 8, a vacuum chamber supporting structure, a mounting height adjusting structure, and a blocking block driving structure;

The vacuum chamber support structure comprises a bottom support plate 1, a pair of vertical lateral support plates 2 which are parallel to each other and are bolted to the bottom support plate, and a central support plate fixed between the support plates by screwing. 3, and an upper support plate 4 parallel to the bottom support plate;

The installation height adjusting structure comprises an adjusting bolt 5, a nut 6 and a vacuum chamber fixing plate 7. The bottom of the adjusting bolt 5 is mounted on the upper supporting plate 4, and the upper portion is mounted with the vacuum chamber fixing plate 7 through the nut 6, and the vacuum chamber fixing plate 7 is passed. The screw is connected with a vacuum chamber 8, and the upper side of the vacuum chamber 8 is provided with a vacuum chamber cover 9;

The blocking block driving structure is mounted on the vacuum chamber cover 9 and includes a blocking block 23, a lower connecting rod 24, a well pipe 10, a knife edge flange 11, a bellows 12, a piston rod sleeve 13, a cylinder 14, Aluminum groove 15, cylinder bracket 16, linear guide 17, rail fixing plate 18, reinforcing plate 21 and thick bracket 22;

An aluminum-shaped groove 15 is mounted on the vacuum chamber cover 9 . The aluminum-shaped groove 15 is mounted with a rail fixing plate 18 through a slider and a hexagonal nut inside thereof, and a linear guide 17 is fixed on the rail fixing plate 18 for use. The piston rod sleeve 13 is mounted for supporting and guiding. Meanwhile, in order to increase the strength and rigidity of the aluminum groove 15, a reinforcing plate 21 and a thick bracket 22 are respectively mounted on both sides of the bottom portion thereof, and are respectively fixed to the vacuum. The cavity body 8 and the vacuum chamber cover plate 9; similarly, the upper and lower ends of the cylinder block of the cylinder 14 are mounted with the cylinder bracket 16 and fixed on the aluminum groove 15 through the cylinder bracket 16;

A through hole is formed in the vacuum chamber cover 9, and the upper and lower ends of the well pipe 10 are respectively welded to the vacuum chamber cover 9 and the knife edge flange 11; the upper and lower end flanges of the bellows 12 in the vertical direction are respectively tightened by bolts. Solidly mounted on the knife edge flange 11 and the piston rod sleeve 13, so that all the blocking process is carried out under closed conditions, ensuring that the medium in the pipeline is not leaked, and the vacuum degree requirement in the vacuum chamber is satisfied; the piston rod sleeve The cylinder 13 is screwed with the piston rod of the cylinder 14, so that the expansion and contraction of the piston rod can drive the compression of the bellows 12 in the vertical direction during operation;

As shown in FIG. 4, a lower connecting rod 24 is welded to the lower end of the piston rod sleeve 13 and is screwed to the blocking block 23; the lower connecting rod 24 is also bolted with an H-shaped insulating rod 25, which is made of G10 material. The fabricated insulating rod can be used to prevent the current generated by the physical action from being transmitted to the block driving structure and the vacuum chamber 8; in order to monitor the generated current, a plug for mounting the current lead is also formed on the blocking block 23. And a hole is reserved in the vacuum chamber cover 9 for installing the aviation socket;

A limit bracket 19 and a limit switch 20 are mounted on the rail fixing plate 18, and when the piston rod sleeve 13 is moved to a specified position, that is, when the blocking block 23 completely covers the beam passage, the limit switch 20 can be used as a mechanical limit. , to ensure that the piston rod sleeve 13 does not exceed the limit position, thereby ensuring that the blocking block 23 does not exceed the limit, and at the same time, the position signal of the piston rod sleeve 13 can be fed back to the control system to achieve the real-time monitoring target; the limit switch 20 is the OMRON limit switch ZC-Q55;

The air cylinder interface is installed on the cylinder 14 of the cylinder, and the interface is connected to the air source system through a hose, and the air source system is controlled by the PLC; when the PLC receives the beam abnormality signal, the air source is turned on, and the electromagnetic valve is opened. The gas enters the intake valve at one end of the cylinder and pushes the piston rod to move; when the piston rod sleeve reaches the limit switch, the in-position signal is fed back to the PLC system, and the system stops operating;

The specific working principle of the present invention is that the air source interface installed on the cylinder of the cylinder 14 is connected to the air source system through a hose, and the air source system is controlled by the PLC; when the PLC receives the beam abnormality signal, the control system emits a beam. The flow blocking command, the compressed air enters the cylinder 14 and pushes the piston rod to move; since the piston rod sleeve 13 is screwed with the piston rod, the telescopic movement of the piston rod drives the downward movement of the piston rod sleeve 13, thereby pushing the lower connecting rod 24 and the movement of the blocking block 23, at this time the bellows 12 is in a compressed state; when the blocking block 23 reaches the beam pipe, the limit switch 20 transmits the in-position signal to the PLC control system, the cylinder 14 stops the intake, and the mechanism stops. The movements ensure the safety of cancer patients and medical staff to a large extent.

Industrial applicability

Claims

A beam blocking mechanism for a cyclotron proton heavy ion medical device, comprising a vacuum chamber (8), a vacuum chamber support structure, a mounting height adjustment structure, and a block driving structure, wherein:

The upper side of the vacuum chamber (8) is provided with a vacuum chamber cover (9); the block driving structure is mounted on the vacuum chamber cover (9), including a blocking block (23);

The vacuum chamber cover (9) is mounted with an aluminum groove (15), the upper portion of the aluminum groove (15) is mounted with a cylinder (14) through the cylinder bracket (16), and the guide plate is fixed at the middle by sliding. a linear guide rail (17) is fixed, and a piston rod sleeve (13) is mounted on the linear guide rail (17); the upper end of the piston rod sleeve (13) is screwed with the piston rod of the cylinder (14);

The blocking block (23) is located in the vacuum chamber (8), and the lower end of the piston rod sleeve (13) is welded with a lower connecting rod (24), a lower connecting rod (24) and a blocking block (23) Connected by thread.
The beam blocking mechanism for a cyclotron proton heavy ion medical device according to claim 1, wherein said vacuum chamber support structure comprises a bottom support plate (1), a pair of parallel and bottom portions The support plate is fixed to the central support plate (3) between the support plates on both sides by a screw-connected vertical lateral support plate (2), and an upper support plate (4) parallel to the bottom support plate.
The beam blocking mechanism for a cyclotron proton heavy ion medical device according to claim 1, wherein said mounting height adjusting structure comprises an adjusting bolt (5), a nut (6), and a vacuum chamber fixing. The plate (7), the bottom of the adjusting bolt (5) is mounted on the upper support plate (4), the upper part is mounted with a vacuum chamber fixing plate (7) through a nut (6), and the vacuum chamber fixing plate (7) is connected to the vacuum chamber by screws (8) ).
The beam blocking mechanism for a cyclotron proton heavy ion medical device according to claim 1, wherein the aluminum plate (15) is respectively provided with a reinforcing plate (21) and a thick portion on both sides of the bottom portion thereof. The brackets (22) are respectively fixed on the vacuum chamber body (8) and the vacuum chamber cover plate (9).
The beam blocking mechanism for a cyclotron proton heavy ion medical device according to claim 1, wherein the vacuum chamber cover (9) is provided with a through hole and a vacuum chamber cover (9). ) is welded to the knife edge flange (11) through the well pipe (10); the blade flange (11) is connected to the piston rod sleeve (13) through the bellows (12).
The beam blocking mechanism for a cyclotron proton heavy ion medical device according to claim 1, wherein the lower connecting rod (24) is further connected with an H-shaped insulating rod by bolts (25). The insulating rod is made of G10 material.
The beam blocking mechanism for a cyclotron proton heavy ion medical device according to claim 1, wherein said blocking block (23) further has a socket for mounting a current lead, and A hole is reserved in the vacuum chamber cover (9) for mounting the aviation socket.
The beam blocking mechanism for a cyclotron proton heavy ion medical device according to claim 1, wherein the rail fixing plate (18) is provided with a limit bracket (19) and a limit switch ( 20).
The beam blocking mechanism for a cyclotron proton heavy ion medical device according to claim 1, wherein said cylinder (14) is mounted with a gas source port, and the interface is connected through a hose The air source system is connected and the air source system is controlled by the PLC.
The beam blocking mechanism for a cyclotron proton heavy ion medical device according to claim 1, wherein the workflow of the beam blocking mechanism is:

The air source interface installed on the cylinder of the cylinder (14) is connected to the air source system through a hose, and the air source system is controlled by the PLC;

When the PLC receives the beam abnormality signal, the control system issues a beam blocking command, and the compressed air enters the cylinder 14 and pushes the piston rod to move, thereby pushing the movement of the lower connecting rod (24) and the blocking block (23). The bellows (12) is in a compressed state;

When the blocking block (23) reaches the beam conduit, the limit switch (20) transmits the in-position signal to the PLC control system, the cylinder (14) stops the intake, and the mechanism stops.