Rotary target sheet clamping mechanism for neutron capture therapy

Abstract

The utility model relates to the field of radiation medical treatment, in particular to a rotating target sheet clamping mechanism for neutron capture therapy, which comprises a mounting plate, a bottom plate, a top plate, equidistant spacing columns and a clamping assembly, the clamping assembly comprises a first clamping jaw, a second clamping jaw, a first incomplete gear, a second incomplete gear and a driving component, the first clamping jaw is connected with the bottom plate and the top plate, the second clamping jaw is connected with the bottom plate and the top plate, the first incomplete gear is rotationally connected with the bottom plate and the top plate, and the second incomplete gear is rotationally connected with the bottom plate and the top plate; the first incomplete gear is meshed with the second incomplete gear, power is transmitted to the first incomplete gear through the driving component, and the first incomplete gear drives the first clamping jaw to rotate; the first incomplete gear drives the first clamping jaw to rotate and drives the second incomplete gear to rotate at the same time, then the second clamping jaw is driven to rotate, the first clamping jaw and the second clamping jaw can be opened and closed, and therefore the target piece body is clamped.

Description

Technical Field

[0001] The utility model relates to the field of radiation medicine, in particular to a rotating target sheet clamping mechanism used for neutron capture therapy. Background Art

[0002] Boron Neutron Capture Therapy (BNCT) is a binary, targeted, cell-level precision radiotherapy mode based on neutron capture reaction, combining radiation and drugs. It combines the advantages of both "biological targeting" and "heavy ion radiotherapy". The high-energy alpha particles and recoil lithium-7 nuclei generated when the isotope boron-10 enriched in tumor tissue captures thermal neutrons will ionize and radiate inside tumor cells, causing irreparable DNA double-strand damage to biological organisms and cell macromolecules, thereby leading to apoptosis or necrosis of tumor cells, while being able to protect surrounding normal tissues well. Traditional photon radiotherapy and proton and heavy ion therapy require multiple irradiations of tumor lesions, up to more than 30 times, while BNCT treatment usually only requires 1 to 2 irradiations, and the treatment course is significantly shorter than traditional photon radiotherapy and proton and heavy ion therapy. The indications of BNCT are mainly invasive, multiple, recurrent, radiation-resistant, and inoperable malignant tumors that cannot be well treated by other radiotherapy methods.

[0003] The core component of this patent in this treatment device is the neutron target station, which is a device for generating neutrons. The specific principle is that a proton beam of a certain energy in the upstream beam tube bombards the target body in the neutron target station. The target body is generally composed of a copper base and a very thin lithium plating layer. The proton lithium plating layer undergoes a nuclear reaction to produce neutrons. A water-cooled microchannel is generally set in the copper base, and the passing plasma water takes away the heat generated by the proton bombardment of the target body. Neutron target stations can be classified into fixed targets and rotating targets. Fixed targets are to fix a single target piece in a non-moving target station mechanism, and rotating targets are to evenly assemble multiple target pieces on a rotating mechanism. Fixed targets do not need to move, and the proton beam will continue to hit a fixed position on the target, which will aggravate the heat dissipation problem of the target and shorten its service life. In the rotating target structure, the target is driven by a motor, and a single target will not always be in working condition. The targets scattered on the rotating mechanism will work evenly in the gaps, which effectively increases the yield of the epithermal neutron beam and greatly increases the proton bombardment area, reducing the heat received by a single target, thereby reducing the temperature rise of the target, greatly increasing the service life of the target, reducing the frequency of target replacement, and improving the reliability of the neutron target station.

[0004] In the existing boron neutron capture tumor therapy devices, waste targets are mainly produced in two ways: 1. Waste targets are produced when normal operation reaches the efficiency limit. After a fixed period of time of charged particle bombardment, the new target pieces will have less material available for nuclear reactions. When the raw materials for nuclear reactions are too few to produce neutrons with sufficient technical parameters and quality, the target pieces become waste targets that have lost their own performance; 2. Due to individual differences in the work of the target pieces, the lithium plating layer on the target pieces melts or falls off, radiation damage, bubbles and bulging, and other abnormal conditions cause the neutron yield produced by proton target shooting to be greatly reduced; these waste targets need to be replaced with new ones before the neutron tumor therapy device can continue to be used. Waste targets have a high dose of induced radioactivity after long-term proton irradiation. If they are replaced manually, maintenance workers need to wear heavy radiation protection clothing; not only are maintenance operations clumsy and inefficient, but they also pose serious risks to the health of operators;

[0005] The main technical solution currently available on the market is to hoist the neutron target station as a whole out of the equipment room and replace it with a new neutron target station. This solution has the problems of long maintenance cycle and high cost, and it is not ruled out that some manufacturers use manual target replacement. Utility Model Content

[0006] The utility model aims to provide a rotating target clamping mechanism for neutron capture therapy, which solves the problems of high maintenance costs of existing solutions on the market and the risk of serious damage to the health of personnel when changing targets in a high-dose radiation environment.

[0007] To achieve the above-mentioned purpose, the utility model provides a rotating target plate clamping mechanism for neutron capture therapy, comprising a mounting plate, a bottom plate, a top plate and equidistantly spaced columns, wherein the bottom plate is mounted on the mounting plate, the top plate is mounted on the mounting plate, the two ends of the equidistantly spaced columns are respectively connected to the bottom plate and the top plate, the equidistantly spaced columns are located between the bottom plate and the top plate, and also comprises a clamping assembly; the clamping assembly comprises a first clamping jaw, a second clamping jaw, a first incomplete gear, a second incomplete gear and a driving member, the first clamping jaw is connected to the bottom plate and the top plate, the second clamping jaw is connected to the bottom plate and the top plate, the first incomplete gear is rotatably connected to the bottom plate and the top plate, and is connected to the first clamping jaw, the second incomplete gear is rotatably connected to the bottom plate and the top plate, and is connected to the second clamping jaw, the first incomplete gear and the second incomplete gear are meshed, and the driving member is arranged on the top plate and drives the first incomplete gear to rotate.

[0008] Among them, the first clamp includes a clamp, a driving link and a driven link, the driving link is rotatably connected to the top plate and is located on one side of the top plate; the driven link is rotatably connected to the top plate and is located on a side of the top plate close to the driving link; the clamp is rotatably connected to the driving link and the driven link, and the clamp is arranged on the driving link.

[0009] Among them, the first incomplete gear includes a bearing, a connecting shaft and a gear body, the bearing is connected to the bottom plate and is arranged on the bottom plate; the connecting shaft is rotatably connected to the bearing, and is fixedly connected to the driving connecting rod and passes through the top plate; the gear body is fixedly connected to the connecting shaft and is arranged on the connecting shaft.

[0010] Wherein, the driving component includes a motor seat, a stepper motor and a coupling, the motor seat is fixedly connected to the top plate and is located on the side of the top plate away from the bottom plate; the stepper motor is connected to the motor seat and is arranged on the motor seat; the two ends of the coupling are respectively connected to the connecting shaft and the output end of the stepper motor, and the connecting shaft sleeve is arranged on the connecting shaft.

[0011] Wherein, the driving component further comprises a motor radiation shielding cover, which is fixedly connected to the motor base and covers the stepping motor.

[0012] The utility model discloses a rotating target clamping mechanism for neutron capture therapy. When in use, power is transmitted to the first incomplete gear through the driving component, and the first incomplete gear drives the first clamping jaw to rotate; while the first incomplete gear drives the first clamping jaw to rotate, it also drives the second incomplete gear to rotate, thereby driving the second clamping jaw to rotate, so that the first clamping jaw and the second clamping jaw can be opened and closed, thereby clamping the target body. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0014] Figure 1 It is a schematic structural diagram of the target sheet body of the first embodiment of the utility model.

[0015] Figure 2 It is a schematic diagram of the overall structure of a rotating target plate clamping mechanism for neutron capture therapy according to the first embodiment of the utility model.

[0016] Figure 3 It is a schematic diagram of the installation structure of the first clamping jaw of the first embodiment of the utility model.

[0017] Figure 4 It is a schematic diagram of the installation structure of the connecting shaft of the first embodiment of the utility model.

[0018] Figure 5 It is a structural schematic diagram of a driving component of the second embodiment of the utility model.

[0019] In the figure: 101-target cover plate, 102-target body, 103-target lithium plating layer, 104-mounting plate, 105-bottom plate, 106-top plate, 107-equidistant spaced columns, 108-clamping assembly, 109-first jaw, 110-second jaw, 111-first incomplete gear, 112-second incomplete gear, 113-driving member, 114-chuck, 115-driving connecting rod, 116-driven connecting rod, 117-bearing, 118-connecting shaft, 119-gear body, 201-motor seat, 202-stepping motor, 203-coupling, 204-motor radiation shielding cover. DETAILED DESCRIPTION

[0020] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0021] First embodiment:

[0022] See also Figures 1 to 4 ,in Figure 1 It is a schematic diagram of the structure of the target body. Figure 2 This is a schematic diagram of the overall structure of the rotating target clamping mechanism used for neutron capture therapy. Figure 3 is a schematic diagram of the installation structure of the first clamping jaw. Figure 4 It is a schematic diagram of the installation structure of the connecting shaft.

[0023] The utility model provides a rotating target clamping mechanism for neutron capture therapy, comprising a mounting plate 104, a bottom plate 105, a top plate 106, equidistant spaced columns 107 and a clamping assembly 108, wherein the clamping assembly 108 comprises a first clamping jaw 109, a second clamping jaw 110, a first incomplete gear 111, a second incomplete gear 112 and a driving member 113, wherein the first clamping jaw 109 comprises a chuck 114, a driving connecting rod 115 and a driven connecting rod 116, wherein the first incomplete gear 111 comprises a bearing 117, a connecting shaft 118 and a gear body 119, wherein the first incomplete gear 111 is driven to rotate by the driving member 113, and the first incomplete gear 111 drives the second incomplete gear 112 to rotate, thereby enabling the first clamping jaw 109 and the second clamping jaw 110 to open and close, and clamp the target body 102, and it can be understood that the above scheme can be used when replacing the target body 102, and can also be used to drive the first incomplete gear 111 to rotate.

[0024] According to this specific embodiment, the bottom plate 105 is mounted on the mounting plate 104, the top plate 106 is mounted on the mounting plate 104, the two ends of the equidistant spaced columns 107 are respectively connected to the bottom plate 105 and the top plate 106, and the equidistant spaced columns 107 are located between the bottom plate 105 and the top plate 106; a manipulator adapter is provided on one side of the mounting plate 104 for connecting the mounting plate 104 and the manipulator;

[0025] Among them, the utility model also provides a lithium target target sheet structure (see Figure 1 ), most of them are a fan-shaped entity, which is divided into a target cover plate 101, a target body 102 and a target lithium-plated layer 103. The target cover plate 101 and the target body 102 are welded together to form a copper base, and a water-cooled microchannel is formed between the target cover plate 101 and the target body 102; wherein the target lithium-plated layer 103 cannot be clamped by a clamping mechanism, because the clamping pressure will greatly cause damage to the lithium-plated layer, so there is an arc area between the arc edge of the target body 102 and the lithium-plated layer for clamping by the clamping mechanism.

[0026] Secondly, the first clamping jaw 109 is connected to the bottom plate 105 and the top plate 106, the second clamping jaw 110 is connected to the bottom plate 105 and the top plate 106, the first incomplete gear 111 is rotatably connected to the bottom plate 105 and the top plate 106 and is connected to the first clamping jaw 109, the second incomplete gear 112 is rotatably connected to the bottom plate 105 and the top plate 106 and is connected to the second clamping jaw 110, the first incomplete gear 111 is meshed with the second incomplete gear 112, and the driving The component 113 is arranged on the top plate 106 and drives the first incomplete gear 111 to rotate; when in use, the power is transmitted to the first incomplete gear 111 through the driving component 113, and the first incomplete gear 111 drives the first clamp 109 to rotate; the first incomplete gear 111 also drives the second incomplete gear 112 to rotate, and then drives the second clamp 110 to rotate, so that the first clamp 109 and the second clamp 110 can be opened and closed, thereby clamping the target sheet body 102.

[0027] At the same time, the driving connecting rod 115 is rotatably connected to the top plate 106 and is located on one side of the top plate 106; the driven connecting rod 116 is rotatably connected to the top plate 106 and is located on a side of the top plate 106 close to the driving connecting rod 115; the chuck 114 is rotatably connected to the driving connecting rod 115 and the driven connecting rod 116, and the chuck 114 is arranged on the driving connecting rod 115; the driving connecting rod 115 and the driven connecting rod 116 are each provided with two The two driving connecting rods 115 are connected to the top plate 106 and the bottom plate 105 respectively, and the two driven connecting rods 116 are connected to the top plate 106 and the bottom plate 105 respectively. The driving connecting rod 115 and the driven connecting rod 116 are arranged in parallel to form a parallelogram mechanism, thereby improving the stability of the clamping head 114 in clamping the target sheet body 102; the structure and principle of the second clamping jaw 110 are the same as those of the first clamping jaw 109, and no further details are given here.

[0028] In addition, the bearing 117 is connected to the bottom plate 105 and is arranged on the bottom plate 105; the connecting shaft 118 is rotatably connected to the bearing 117, and is fixedly connected to the driving connecting rod 115, and passes through the top plate 106; the gear body 119 is fixedly connected to the connecting shaft 118 and is arranged on the connecting shaft 118; the structure of the second incomplete gear 112 is the same as that of the first incomplete gear 111, except that the connecting shaft 118 in the first incomplete gear 111 is connected to the driving member 113, and the gear body of the first incomplete gear 111 and the The gear body in the second incomplete gear 112 is meshed; the bearing 117 is used to improve the stability of the connecting shaft 118 when it rotates, and the connecting shaft 118 is driven to rotate by the driving member 113, thereby driving the first driving connecting rod 115 to rotate, so that the first driving connecting rod 115 drives the chuck 114 to rotate, and the connecting shaft 118 also drives the gear body 119 to rotate, and the gear body 119 drives the second incomplete gear 112 to rotate, thereby driving the second clamping jaw 110 to rotate; the purpose of opening and closing the first clamping jaw 109 and the second clamping jaw 110 is achieved.

[0029] When the rotating target plate clamping mechanism for neutron capture therapy of this embodiment is used, the connecting shaft 118 is driven to rotate by the driving member 113, thereby driving the driving connecting rod 115 and the gear body 119 to rotate, the driving connecting rod 115 drives the chuck 114 to rotate, the gear body 119 drives the second incomplete gear 112 to rotate, thereby driving the second clamping jaw 110 to rotate, so that the chuck of the first clamping jaw 109 and the chuck of the second clamping jaw 110 can be opened and closed, thereby achieving the purpose of clamping the target plate body 102; the driving connecting rod 115 and the driven connecting rod 116 form a parallelogram mechanism to drive the chuck 114 to open and close, thereby improving the stability of clamping.

[0030] Second embodiment:

[0031] Based on the first embodiment, please refer to Figure 5 , Figure 5 2 is a schematic diagram of the structure of the driving component of the second embodiment. The driving component 113 of this embodiment includes a motor base 201 , a stepping motor 202 , a coupling 203 and a motor radiation shielding cover 204 .

[0032] According to this specific embodiment, the motor base 201 is fixedly connected to the top plate 106 and is located on the side of the top plate 106 away from the bottom plate 105; the stepper motor 202 is connected to the motor base 201 and is arranged on the motor base 201; the two ends of the coupling 203 are respectively connected to the connecting shaft 118 and the output end of the stepper motor 202, and the connecting shaft 118 is sleeved on the connecting shaft 118; the coupling 203 is driven to rotate by the stepper motor 202, and then the connecting shaft 118 is driven to rotate, thereby achieving the purpose of driving the connecting shaft 118 to rotate.

[0033] The motor radiation shielding cover 204 is fixedly connected to the motor base 201 and covers the stepping motor 202 ; radiation isolation is performed by the motor radiation shielding cover 204 to ensure the normal and high-reliability operation of the stepping motor 202 .

[0034] The utility model has the following beneficial effects: 1. The structure is simple and compact, and is realized by using the most primitive parallel rocker arm structure plus a gear mechanism; 2. The function of clamping the target piece is realized by using the holding torque and low-speed high-torque output of the stepper motor 202; based on the above two points, the market competitiveness of neutron tumor medical treatment is effectively improved.

[0035] What is disclosed above is only one or more preferred embodiments of the present application, and cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiments and equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A rotating target clamping mechanism for neutron capture therapy, comprising a mounting plate, a bottom plate, a top plate and equidistant spaced columns, wherein the bottom plate is mounted on the mounting plate, the top plate is mounted on the mounting plate, the two ends of the equidistant spaced columns are respectively connected to the bottom plate and the top plate, and the equidistant spaced columns are located between the bottom plate and the top plate, characterized in that: Also included is a clamping assembly; The clamping assembly includes a first jaw, a second jaw, a first incomplete gear, a second incomplete gear and a driving member, the first jaw is connected to the bottom plate and the top plate, the second jaw is connected to the bottom plate and the top plate, the first incomplete gear is rotatably connected to the bottom plate and the top plate and is connected to the first jaw, the second incomplete gear is rotatably connected to the bottom plate and the top plate and is connected to the second jaw, the first incomplete gear is meshed with the second incomplete gear, and the driving member is disposed on the top plate and drives the first incomplete gear to rotate.

2. The rotating target clamping mechanism for neutron capture therapy according to claim 1, characterized in that: The first clamp includes a clamp, a driving link and a driven link, the driving link is rotatably connected to the top plate and is located on one side of the top plate; the driven link is rotatably connected to the top plate and is located on a side of the top plate close to the driving link; the clamp is rotatably connected to the driving link and the driven link, and the clamp is arranged on the driving link.

3. The rotating target clamping mechanism for neutron capture therapy according to claim 2, characterized in that: The first incomplete gear includes a bearing, a connecting shaft and a gear body, wherein the bearing is connected to the base plate and is arranged on the base plate; the connecting shaft is rotatably connected to the bearing and is fixedly connected to the driving connecting rod and passes through the top plate; the gear body is fixedly connected to the connecting shaft and is arranged on the connecting shaft.

4. The rotating target clamping mechanism for neutron capture therapy according to claim 3, characterized in that: The driving component includes a motor seat, a stepper motor and a coupling. The motor seat is fixedly connected to the top plate and is located on a side of the top plate away from the bottom plate. The stepper motor is connected to the motor seat and is arranged on the motor seat. The two ends of the coupling are respectively connected to the connecting shaft and the output end of the stepper motor, and the connecting shaft is sleeved on the connecting shaft.

5. The rotating target clamping mechanism for neutron capture therapy according to claim 4, characterized in that: The driving component further comprises a motor radiation shielding cover, which is fixedly connected to the motor seat and covers the stepping motor.

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