CN209828004U - A New Stereotactic Radiation Therapy System - Google Patents

Abstract

The utility model discloses a novel stereotactic radiotherapy system, which increases the incident angle range of rays, improves the coke-skin ratio and the focus dose rate, and the weight load on the two sides of the machine head is balanced, thereby improving the rotation precision of the machine head and reducing the abrasion of equipment; the technical scheme is as follows: the rotary drum is movably arranged on the base and can do circular motion on the base along with the central axis of the rotary drum, the rotary disc is sleeved on the tray and can rotate on the tray under the action of a driving mechanism of the rotary disc, the two treatment head racks are symmetrically arranged on the rotary disc, the lower ends of the treatment head racks are movably provided with treatment heads, the treatment heads are arranged on the treatment head racks through an adjusting structure, and the adjusting structure is used for ensuring that rays of the treatment heads are always gathered at the intersection of the central axis of the rotary drum and the rotating axis of the rotary disc and adjusting the included angle between the rays of the treatment heads and the rotating axis of the rotary disc; the utility model can be widely applied to the field of radiation therapy.

Description

A New Stereotactic Radiation Therapy System

technical field

The utility model relates to a novel stereotactic radiotherapy system, which belongs to the technical field of radiotherapy.

Background technique

Radiation therapy (referred to as radiotherapy) is an important method of tumor treatment, and precision radiotherapy is an important development direction in the field of radiotherapy. Stereotactic radiotherapy (SRS/SBRT) is an important part of precision radiotherapy, including precise positioning of tumor targets and normal or crisis organs, and high-dose and less-fractionated irradiation techniques. The benefits of stereotactic radiation therapy are increasingly clinically demonstrated. According to RTOG clinical research data, it is estimated that in the next 10 years, the utilization rate of stereotactic radiotherapy technology in brain cancer will increase by 108%; the utilization rate in body tumors will increase by 144%.

At present, the common methods to achieve stereotactic radiotherapy are: 1) Gamma Knife technology; 2) Stereotactic radiotherapy equipment based on linear accelerator; 3) Proton or heavy ion radiotherapy. Among them, the Gamma Knife has been widely used in my country because of its simple and mature technology, extremely low failure rate, simple maintenance, simple operation, and high degree of localization.

The main structure of the hardware of the gyro knife is mainly composed of three parts: the drum, the machine head, and the treatment bed. The drum can rotate 360° around the isocenter of the equipment, commonly known as revolution. The machine head is mounted on the drum and can be driven by a motor to rotate, usually called autorotation. A cobalt 60 treatment head is installed on one side of the handpiece. By adjusting the installation angle of the treatment head, the ray beam output by the treatment head and the self-driving mechanism line of the handpiece form a fixed angle. When the equipment is working, while the head rotates with the drum, the treatment head also rotates with the head, that is, the gyro rotates.

After long-term practical application, it is found that the current gyro knife has the following shortcomings: 1. Because the gyro rotation angle of the treatment head is a fixed angle, the adjustable range of the irradiation path is small, and the incident angle cannot be adjusted according to actual clinical requirements; 2. Due to the rotation of the head The speed is constant. When the drum rotates faster, the step gap of the gyro rotation of the treatment head will be relatively large, which is not conducive to reducing the dose of surrounding normal tissues and improving the focal skin ratio; 3. The treatment head is installed on one side of the machine head , Because the treatment head uses high-density metals such as tungsten and uranium, the mass of the treatment head is very large, so the weight load on both sides of the head is unbalanced, the rotation accuracy of the head is insufficient, and the wear is relatively large.

Utility model content

The utility model overcomes the deficiencies in the prior art and provides a novel stereotactic radiotherapy system, which increases the incident angle range of rays, improves the focal-to-skin ratio and focal dose rate, and balances the weight and load on both sides of the machine head, improving The rotation accuracy of the machine head reduces equipment wear.

In order to solve the above technical problems, the technical solution adopted by the utility model is: a novel stereotactic radiotherapy system, including a base, a rotating drum, a tray, a turntable, a treatment head frame and a treatment head, and the rotating drum is movably arranged on the base above, and the rotating drum can make a circular motion on the base along with its own central axis, the tray is fixedly arranged on the inner wall of the rotating drum in the shape of "earth", and the plane of the tray is parallel to the central axis of the rotating drum, The turntable is set on the tray and is located between the two pallets of the tray, and the rotation axis of the turntable is on the same plane as the central axis of the rotating drum and is perpendicular to each other. Under the action of its own driving mechanism, the turntable can The tray rotates, and the two treatment head frames are symmetrically arranged on the turntable, and the lower end of the treatment head frame is located below the lower end surface of the tray, and the lower ends of the treatment head frames are all movable with treatment heads, so The treatment head is arranged on the treatment head frame through an adjustment structure, and the adjustment structure is used to ensure that the rays of the treatment head are always gathered at the intersection of the central axis of the rotating drum and the rotation axis of the turntable, and can adjust the rays of the treatment head and the rotation axis of the turntable angle between.

The structure of the adjustment structure includes an arc guide rail, a gear, a driver, a guide block and a frame body, the arc guide rail is fixedly arranged in the treatment head frame, the arc of the arc guide rail is equal to the arc of the rotating drum, and The center of the arc-shaped guide rail coincides with the center of the circle of the section where the arc-shaped guide rail is located. The inner side of the arc-shaped guide rail is provided with an arc-shaped rack, and the gears are matched and meshed on the arc-shaped rack. The body is movably arranged on the frame of the treatment head, the frame is used to limit the gear on the arc rack, and one end of the frame is movably arranged on the rear side of the arc guide rail through the arc guide block, so The other end of the frame body is provided with a treatment head, and the frame body is provided with a driver, and the driver is connected with a gear for driving the gear to move along the arc-shaped rack.

The driver is a stepping motor or a servo motor, and the stepping motor or the servo motor is electrically connected to the control module, and the control module controls the precise movement of the stepping motor or the servo motor to realize real-time and precise rotation of the treatment head.

The two treatment heads adjust the included angle between the radiation of the treatment head and the rotation axis of the turntable synchronously or asynchronously through their respective stepping motors or servo motors, so as to realize the arbitrary adjustment of the angle within a certain range.

Compared with the prior art, the utility model has the beneficial effects that: the utility model upgrades the existing single treatment head to a double treatment head, and changes the installation method of the treatment head on the machine head from a fixed type to a movable type. By driving the motor, the gyro rotation angle of the treatment head can be adjusted arbitrarily within a certain range, increasing the incident angle range of the ray, and better meeting the clinical treatment requirements; due to the constant rotation speed of the head, when the drum rotation speed is fast, due to the machine According to the double treatment head on the head, the step gap of the gyro rotation of the treatment head will be reduced by half, which is beneficial to reduce the dose of surrounding normal tissues and help to improve the focal skin ratio; two treatment heads are installed symmetrically on both sides of the machine head, On the premise of not increasing the amount of cobalt source, the number of collimation holes is increased, and the height of the radioactive source column is reduced. Since the height of the radioactive source is exponentially related to the self-absorption of the radioactive source, the radioactive source column can be greatly reduced. The self-absorption improves the focal dose rate; the weight and load balance on both sides of the machine head improves the rotation accuracy of the machine head and reduces equipment wear.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is described further.

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a schematic diagram of the adjustment structure in the utility model.

In the figure: 1 is the base, 2 is the rotating drum, 3 is the tray, 4 is the turntable, 5 is the treatment head frame, 6 is the treatment head, 7 is the adjustment structure, 71 is the arc guide rail, 72 is the gear, 73 is the driver , 74 is a guide block, 75 is a frame body, and 76 is an arc rack.

Detailed ways

As shown in Figures 1 and 2, a novel stereotactic radiotherapy system of the present invention includes a base 1, a rotating drum 2, a tray 3, a turntable 4, a treatment head frame 5 and a treatment head 6, and the rotating drum 2 It is movably arranged on the base 1, and the rotating drum 2 can make a circular motion on the base 1 along with its own central axis. The plane of 3 is parallel to the central axis of the rotating drum 2, the turntable 4 is set on the tray 3, and is located between the two pallets of the tray 3, and the rotation axis of the turntable 4 is in a plane with the central axis of the rotating drum 2 and perpendicular to each other, the turntable 4 can rotate on the tray 3 under the action of its own drive mechanism, and the two treatment head frames 5 are symmetrically arranged on the turntable 4, and the lower end of the treatment head frame 5 is located on the tray Below the lower end surface of 3, the lower end of the treatment head frame 5 is provided with a treatment head 6, and the treatment head 6 is arranged on the treatment head frame 5 through an adjustment structure 7, and the adjustment structure 7 is used to ensure the treatment The rays of the head 6 are always gathered at the intersection of the central axis of the rotating drum 2 and the rotation axis of the turntable 4, and the angle between the rays of the treatment head 6 and the rotation axis of the turntable 4 can be adjusted.

The structure of the adjustment structure 7 includes an arc guide rail 71, a gear 72, a driver 73, a guide block 74 and a frame body 75, and the arc guide rail 71 is fixedly arranged in the treatment head frame 5, and the arc guide rail 71 The arc is equal to the arc of the rotary drum 2, and the center of the arc guide rail 71 coincides with the center of circle of the rotary drum 2 at the section where the arc guide rail 71 is located, and the arc rack 76 is arranged inside the arc guide rail 71, so Said gear 72 is matched and engaged on the arc rack 76, said frame body 75 is movably arranged on the treatment head frame 5, said frame body 75 is used to limit the gear 72 on the arc rack 76, and the One end of the frame body 75 is movably arranged on the rear side of the arc guide rail 71 through an arc-shaped guide block 74, the other end of the frame body 75 is provided with a treatment head 6, and the frame body 75 is provided with a driver 73, and the driver 73 is connected with the gear 72 for driving the gear 72 to move along the arc rack 76 .

The driver 73 is a stepping motor or a servo motor, and the stepping motor or the servo motor is electrically connected to the control module, and the control module controls the precise movement of the stepping motor or the servo motor to realize the real-time precise rotation of the treatment head 6 .

The two treatment heads 6 adjust the included angle between the radiation of the treatment head 6 and the rotation axis of the turntable 4 synchronously or asynchronously through their respective stepping motors or servo motors, so as to realize the arbitrary adjustment of the angle within a certain range .

The utility model keeps the current drum structure unchanged, and two treatment heads are symmetrically installed on both sides of the machine head, and the two treatment heads are installed on the machine head through leading screws and guide rails. The two treatment heads can be driven by the motor to adjust the angle formed by the treatment head rays and the self-driving mechanism line of the handpiece synchronously, so that the angle can be adjusted arbitrarily within a certain range.

The utility model upgrades the existing single treatment head to a double treatment head, changes the installation method of the treatment head on the machine head from a fixed type to a movable type, and realizes that the gyro rotation angle of the treatment head is within a certain range by driving the motor Arbitrary adjustment to increase the incident angle range of rays to better meet the clinical treatment requirements; due to the constant rotation speed of the machine head, when the drum rotates at a faster speed, the machine head will follow the stepping steps of the gyro rotation of the treatment head due to the dual treatment heads on the machine head The gap will be reduced by half, which is beneficial to reduce the dose of surrounding normal tissues and improve the focal-to-skin ratio; two treatment heads are installed symmetrically on both sides of the handpiece, which increases the precision without increasing the amount of cobalt source. The number of straight holes reduces the height of the radioactive source column. Since the height of the radioactive source is exponentially related to the self-absorption of the radioactive source, it can greatly reduce the self-absorption of the radioactive source column and increase the focal dose rate; the weight on both sides of the machine head Load balance improves the rotation accuracy of the machine head and reduces equipment wear.

The above embodiments of the utility model have been described in detail in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned embodiments. Make various changes below.

Claims (4)

1. A novel stereotactic radiotherapy system is characterized by comprising a base (1), a rotary drum (2), a tray (3), a turntable (4), a therapy head rack (5) and a therapy head (6), wherein the rotary drum (2) is movably arranged on the base (1), the rotary drum (2) can do circular motion on the base (1) along with the central axis of the rotary drum, the tray (3) is fixedly arranged on the inner side wall of the rotary drum (2) in a soil shape, the plane of the tray (3) is parallel to the central axis of the rotary drum (2), the turntable (4) is sleeved on the tray (3) and is positioned between two supporting plates of the tray (3), the self-rotating axis of the turntable (4) and the central axis of the rotary drum (2) are positioned on the same plane and are mutually perpendicular, and the turntable (4) can rotate on the tray (3) under the action of a self-driving mechanism, two treatment head frame (5) symmetry sets up on carousel (4), just the lower extreme of treatment head frame (5) is located the lower terminal surface below of tray (3), the equal activity of lower extreme of treatment head frame (5) is provided with treatment head (6), treatment head (6) set up on treatment head frame (5) through adjusting structure (7), it gathers at the intersection of axis of rotation of rotary drum (2) the central axis and carousel (4) from the axis of rotation always to adjust the contained angle between treatment head (6) ray and carousel (4) axis of rotation.

2. The novel stereotactic radiation therapy system according to claim 1, wherein said adjusting structure (7) comprises an arc-shaped guide rail (71), a gear (72), a driver (73), a guide block (74) and a frame body (75), said arc-shaped guide rail (71) is fixedly disposed in said therapeutic head frame (5), the radian of said arc-shaped guide rail (71) is equal to the radian of said rotary drum (2), the center of said arc-shaped guide rail (71) coincides with the center of said rotary drum (2) on the cross section of said arc-shaped guide rail (71), said arc-shaped guide rail (71) is provided with an arc-shaped rack (76) on the inner side, said gear (72) is engaged with said arc-shaped rack (76), said frame body (75) is movably disposed on said therapeutic head frame (5), said frame body (75) is used for limiting said gear (72) on said arc-shaped rack (76), and the one end of support body (75) is passed through curved guide block (74) activity and is set up the rear side in arc guide rail (71), the other end of support body (75) sets up treatment head (6), support body (75) are provided with driver (73), driver (73) are connected with gear (72) for drive gear (72) move along arc rack (76).

3. The system of claim 2, wherein the driver (73) is a stepping motor or a servo motor, the stepping motor or the servo motor is electrically connected with the control module, and the control module controls the stepping motor or the servo motor to perform precise motion, so as to realize real-time precise rotation of the treatment head (6).

4. A novel stereotactic radiation therapy system according to claim 3, wherein said two treatment heads (6) are used to adjust the angle between the ray of the treatment head (6) and the rotation axis of the turntable (4) synchronously or asynchronously by means of respective stepping motors or servomotors, so as to achieve any adjustment of the angle within a certain range.