Particle emission beam collimator

Abstract

The utility model discloses a particle emission beam collimator and belongs to the technical field of medical instruments. The objective of the utility model is to solve the problem that the aperture of an existing particle beam outlet cannot be adjusted, thereby limiting the accuracy of irradiation and the flexibility of adjustment according to different application requirements. The device comprises a particle emission collimation port, a plurality of shielding bodies and a driving ring, the plurality of shielding bodies are circumferentially and uniformly arranged at the port of the particle emission collimation port, the outer end of each shielding body is movably connected with the port of the particle emission collimation port, and the inner ends of the plurality of shielding bodies define a particle beam adjusting port. Each shielding body is provided with a driving pin and is connected to the driving ring; when the driving ring is driven to rotate around the central axis of the particle emission collimation opening, the rotating force of the driving ring is transmitted to the shielding bodies through the driving pins, and the inner ends of the shielding bodies gather inwards or expand outwards so as to adjust the aperture size of the particle beam adjusting opening. The device is used for adjusting the aperture of the particle beam outlet.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a particle emission beam collimator. Background Art

[0002] In the field of new radiotherapy, such as proton therapy, heavy ion therapy, and boron neutron capture therapy, high-energy particles are generated by particle accelerators to accurately irradiate the patient's lesions to complete treatment.

[0003] During radiation therapy using a particle beam, the beam must be precisely directed to the patient's lesion, ensuring complete coverage of the tumor area and avoiding missed lesions, thereby ensuring the accuracy and effectiveness of treatment. Specifically, beam outlets of varying diameters must be selected based on the shape and size of the patient's lesion to avoid missed lesions while minimizing neutron beam exposure to irrelevant tissue and potential damage.

[0004] In the existing technology, a single device is fixedly equipped with a treatment head of a single specification and a fixed beam outlet diameter. Therefore, the focal spot size of the particle beam used for treatment is fixed. This limits the accuracy of irradiation and the flexibility to adjust according to different application requirements, making it difficult to accurately irradiate patients with tumor lesions of different shapes and sizes. Adjusting the size of the beam outlet requires replacing the outlet. Such treatment heads are usually activated by particle bombardment to produce a photonuclear reaction, which carries induced radioactivity and has accumulated residual radiation, making replacement difficult. Replacing the beam outlet also requires high maintenance costs and long equipment downtime. Utility Model Content

[0005] In view of this, the utility model provides a particle emission beam collimator, which utilizes multiple shielding bodies to form a particle beam adjustment ring, and changes the diameter of the particle beam adjustment port through the deformation of the particle beam adjustment ring.

[0006] In order to achieve the above-mentioned purpose, the present utility model provides the following technical solutions.

[0007] 1. A particle emission beam collimator, comprising a particle emission collimation port, a plurality of shielding bodies and a driving ring. The plurality of shielding bodies are evenly arranged circumferentially at the port of the particle emission collimation port. The outer end of each shielding body is movably connected to the port of the particle emission collimation port. The inner ends of the plurality of shielding bodies enclose a particle beam adjustment port. Each shielding body is provided with a driving pin and connected to the driving ring. When the driving ring rotates around the central axis of the particle emission collimation port, the rotational force of the driving ring is transmitted to the shielding body via the driving pin, and the inner ends of the plurality of shielding bodies converge inward or expand outward to adjust the aperture size of the particle beam adjustment port.

[0008] The particle beam is emitted from the particle emission collimator. When the driver rotates around the central axis of the particle emission collimator, the rotational force of the drive ring is transmitted to the shields via the drive pins. Each shield moves synchronously and in the same direction, causing the inner ends of the shields to converge inward or expand outward, thereby changing the diameter of the particle beam adjustment port. The diameter of the particle beam adjustment port can be adjusted according to the shape and size of the patient's lesion, avoiding missed lesions while minimizing the neutron beam from irradiating irrelevant tissue and causing unnecessary damage.

[0009] 2. On the basis of technical solution 1, it also includes an annular limit seat, which is installed at the particle emission collimation port. A plurality of guide slides are provided in the circumferential direction of the annular limit seat, and the sliding direction of each guide slide extends along the radial direction of the annular limit seat; each shielding body is a fan-shaped shielding block, and each fan-shaped shielding block corresponds to a guide slide, the driving pin of the fan-shaped shielding block is inserted into the corresponding guide slide, and the two adjacent fan-shaped shielding blocks are slidably connected; each fan-shaped shielding block moves along the sliding direction of the guide slide as the driving ring rotates, and at the same time, a lateral thrust is generated between the two adjacent fan-shaped shielding blocks and they slide relative to each other, so that the inner end of the fan-shaped shielding block gathers inward or expands outward.

[0010] 3. Based on Technical Solution 2, the driving pin is located at the top corner of the arc side of the sector-shaped shielding block.

[0011] 4. Based on technical solution 2, a plurality of drive grooves are opened in the circumferential direction of the drive ring, each drive groove corresponds to a guide slide and is arranged to intersect with the corresponding guide slide at an acute angle, each sector-shaped shielding block corresponds to a drive groove, and the drive pin of the sector-shaped shielding block is inserted into the corresponding drive groove; as the drive ring rotates, the drive groove generates a thrust on the drive pin to cause the drive pin to move along the extension direction of the guide slide. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The present invention is a schematic diagram of the overall structure of the particle emission beam collimator.

[0013] Figure 2 This is an exploded view of this embodiment.

[0014] Figure 3 This is the state diagram when the particle beam adjustment port is closed.

[0015] Figure 4 This is the state diagram when the particle beam adjustment port is open.

[0016] Figure 5 It is a cross-sectional view of this embodiment.

[0017] The accompanying drawings are marked as follows: particle emission collimation port 1; shielding body 2; sliding pin 21; driving pin 22; sliding pair 23; driving ring 3; driving slide 31; annular limit seat 4; annular mounting cavity 41; upper annular cover 42; first slide 421; lower annular cover 43; second slide 431; particle shaping cavity 5. DETAILED DESCRIPTION

[0018] The present invention will be described in detail below with reference to specific embodiments.

[0019] like Figures 1 to 5 As shown, this embodiment provides a particle emission beam collimator, comprising a particle emission collimator port 1, multiple shields 2, and a drive ring 3. The particle emission collimator port 1 is mounted at the end of a particle shaping cavity 5. Multiple shields 2 are evenly arranged circumferentially around the end of the particle emission collimator port 1 to form a particle beam adjustment ring. The outer end of each shield 2 is movably connected to the end of the particle emission collimator port 1, and the inner ends of the multiple shields 2 enclose the particle beam adjustment port, which is the central opening of the particle beam adjustment ring. Each shield 2 is provided with a drive pin 22 and connected to the drive ring 3. When the drive ring 3 rotates about the central axis of the particle emission collimator port 1, the rotational force of the drive ring 3 is transmitted to the shields 2 via the drive pin 22, causing each shield 2 to move synchronously and in the same direction. The inner ends of the shields 2 converge inward or expand outward, and the particle beam adjustment ring deforms to adjust the diameter of the particle beam adjustment port. The inlet of the particle generator is connected to the particle shaping cavity 5. The generated particles enter the particle shaping cavity 5 and are decelerated. Since the particle emission collimation port 1 is installed at the end of the particle shaping cavity 5, the particle beam will be emitted from the particle emission collimation port 1. In this embodiment, the caliber of the particle beam adjustment port can be adjusted according to the shape and size of the patient's lesion, avoiding missed irradiation while minimizing the neutron beam from irradiating irrelevant tissue and causing unnecessary damage. Among them, when the patient's lesion is small, the inner end of the shield 2 converges inward, the particle beam adjustment port gradually closes, and the caliber decreases. The particles emitted from the particle shaping cavity 5 are blocked by the shield 2 and can only be emitted from the particle beam adjustment port and irradiate the lesion, achieving precise irradiation of the particle beam. When the patient's lesion is large, the inner end of the shield 2 expands outward, the particle beam adjustment port gradually opens, and the caliber increases. The particles emitted from the particle shaping cavity 5 directly irradiate the lesion, increasing the effective area.

[0020] like Figures 1 to 5 As shown, the particle emission beam collimator also includes an annular stopper 4, which is installed at the particle emission collimation port 1. An annular mounting cavity 41 is provided in the annular stopper 4, and a plurality of guide slideways are provided in the circumferential direction of the annular stopper 4. The sliding direction of each guide slideway extends along the radius direction of the annular stopper 4. Specifically, combined with Figure 2The annular limit seat 4 includes an upper annular cover 42 and a lower annular cover 43. The upper annular cover 42 and the lower annular cover 43 are coaxially arranged and connected, and an annular mounting cavity 41 is formed between the two. The upper annular cover 42 is provided with a plurality of first slide grooves 421 in the circumferential direction. The sliding direction of the first slide grooves 421 is the same as the radial direction of the upper annular cover 42. The lower annular cover 43 is provided with a plurality of second slide grooves 431 in the circumferential direction. The sliding direction of the second slide grooves 431 is the same as the radial direction of the lower annular cover 43. The first slide grooves 421 and the second slide grooves 431 are arranged in a one-to-one correspondence and form a guide slideway. Each shielding body 2 is a fan-shaped shielding block, and the fan-shaped shielding blocks are preferably 12. The 12 fan-shaped shielding blocks are closely arranged in sequence along the circumferential direction to form a particle beam adjustment ring with a particle beam adjustment port of dodecagonal shape. Each sector-shaped shielding block corresponds to a guide slideway. Each sector-shaped shielding block is also equipped with a sliding pin 21, which is positioned opposite a drive pin 22 on the upper and lower surfaces of the sector-shaped shielding block. The arcuate end of the sector-shaped shielding block extends into the annular mounting cavity 41. The sliding pin 21 of the sector-shaped shielding block is inserted into the second slide groove 431 of the lower annular cover 43, while the drive pin 22 extends through the first slide groove 421 of the upper annular cover 42 and connects to the drive ring 3. Adjacent sector-shaped shielding blocks are slidably connected via a sliding pair 23, ensuring the overall annular structure of the sector-shaped shielding block. When the drive ring 3 rotates about the central axis of the particle emission collimator 1, the drive ring 3 applies thrust to the drive pin 22, causing each sector-shaped shielding block to move along the sliding direction of the guide slideway. As the adjacent sector-shaped shielding blocks generate lateral thrust and slide relative to each other, each sector-shaped shielding block deflects, causing the inner ends of the sector-shaped shielding blocks to converge inward or expand outward.

[0021] In this embodiment, the shielding body 2 can be installed at the particle emission collimation port 1 through the design of the annular limit seat 4. The design of the guide slideway in the annular limit seat 4 allows the fan-shaped shielding body 2 to move only along the sliding direction of the guide slideway under the drive of the drive ring 3. At the same time, a lateral thrust is generated between two adjacent fan-shaped shielding blocks, so that the tip of the fan-shaped shielding block can only deflect to one side, so that the inner end of the fan-shaped shielding block can gather inward or expand outward. Among them, the sliding pin 21 and the driving pin 22 are both at the top corners of the arc side of the fan-shaped shielding block. Such a design can reduce the coverage area of ​​the driving ring 3 on each shielding body 2 compared to setting the sliding pin 21 and the driving pin 22 near the middle of the fan-shaped shielding block, thereby increasing the aperture size adjustment range of the particle beam adjustment port.

[0022] like Figures 1 to 4As shown, in this embodiment, a plurality of driving grooves 31 are opened in the circumferential direction of the driving ring 3, each driving groove 31 corresponds to a guide slide, and compared with the grooves in the radial direction, the driving grooves 31 are deflected to one side so that each driving groove 31 and the corresponding guide slide are arranged at an acute angle, and each sector-shaped shielding block corresponds to a driving groove 31, and the driving pin 22 of the sector-shaped shielding block passes through the first groove 421 of the upper annular cover 42 and is inserted into the corresponding driving groove 31; combined with Figure 3 and Figure 4 When the drive ring 3 rotates counterclockwise, the drive slot 31 generates a counterclockwise thrust on the drive pin 22, and the drive pin 22 transmits the thrust to the sector-shaped shielding block. Under the limit of the first slot 421 of the upper annular cover 42, the drive pin 22 drives the sector-shaped shielding block to move outward along the first slot 421, and also generates a counterclockwise lateral thrust between the sector-shaped shielding blocks. All the sector-shaped shielding blocks are deflected counterclockwise, and the diameter of the particle beam adjustment port becomes larger, that is, Figure 3 The status shown is Figure 4 On the contrary, when the driving ring 3 rotates clockwise, the diameter of the particle beam regulating port becomes smaller.

[0023] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A particle emission beam collimator, characterized by: The invention comprises a particle emission collimation port, a plurality of shielding bodies and a driving ring. The plurality of shielding bodies are evenly arranged at the port of the particle emission collimation port in a circumferential direction. The outer end of each shielding body is movably connected to the port of the particle emission collimation port. The inner ends of the plurality of shielding bodies enclose a particle beam adjustment port. Each shielding body is provided with a driving pin and is connected to the driving ring. When the driving ring rotates around the central axis of the particle emission collimation port, the rotational force of the driving ring is transmitted to the shielding body via the driving pin, and the inner ends of the plurality of shielding bodies gather inward or expand outward to adjust the aperture size of the particle beam adjustment port.

2. The particle emission beam collimator according to claim 1, characterized in that: It also includes an annular limit seat, which is installed in the particle emission collimation port. A plurality of guide slides are provided in the circumferential direction of the annular limit seat, and the sliding direction of each guide slide extends along the radial direction of the annular limit seat; each shielding body is a fan-shaped shielding block, and each fan-shaped shielding block corresponds to a guide slide, the driving pin of the fan-shaped shielding block is inserted into the corresponding guide slide, and the two adjacent fan-shaped shielding blocks are slidably connected; each fan-shaped shielding block moves along the sliding direction of the guide slide as the driving ring rotates, and at the same time, a lateral thrust is generated between the two adjacent fan-shaped shielding blocks and they slide relative to each other, so that the inner end of the fan-shaped shielding block gathers inward or expands outward.

3. The particle emission beam collimator according to claim 2, characterized in that: The driving pin is located at a top corner of the arc side of the sector-shaped shielding block.

4. The particle emission beam collimator according to claim 2, characterized in that: A plurality of drive grooves are provided in the circumferential direction of the drive ring, each drive groove corresponds to a guide slide and is arranged to intersect with the corresponding guide slide at an acute angle, each sector-shaped shielding block corresponds to a drive groove, and the drive pin of the sector-shaped shielding block is inserted into the corresponding drive groove; as the drive ring rotates, the drive groove generates a thrust on the drive pin, so that the drive pin moves along the extension direction of the guide slide.

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