Focusing head

Abstract

This application discloses a focusing head, belonging to the field of medical device technology. The focusing head includes: a shielding box, a housing, and a shielding rod; the housing is located inside the shielding box and is used to carry at least one radiation source; the shielding rod is located inside the shielding box and positioned in the direction of the radiation emitted by the radiation source, and the shielding rod has at least one collimating channel, each collimating channel corresponding to one radiation source; wherein, the shielding rod is movably connected to the shielding box, and the shielding rod is configured to rotate within the shielding box to keep the focusing head in an open-source state or a closed-source state. The housing is located inside the shielding box and outside the shielding rod, maintaining a relatively stationary state with respect to the shielding box at all times; that is, the housing is fixed inside the shielding box. This eliminates the need for a thick shielding box to effectively shield the radiation emitted by the radiation source, resulting in a smaller shielding box size and lower manufacturing cost.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a focusing head. Background Technology

[0002] Gamma Knife is a large-scale medical device used to treat cancer. Based on the principle of stereotactic geometry, Gamma Knife selectively targets normal or diseased tissue within the brain, using a single, high-dose focused irradiation of the target area with gamma rays generated by cobalt-60. This causes focal necrosis or functional changes, thereby achieving the goal of treating the disease.

[0003] The focusing head is the core component of the Gamma Knife, and it mainly includes: a housing, a shielding rod, a drive assembly, a shielding box, and a collimator. Multiple radiation sources are housed within the housing, which is located inside and fixedly connected to the shielding rod. The shielding rod can be installed inside the shielding box, while the drive assembly is located outside the shielding box and connected to the shielding rod. The drive assembly drives the shielding rod and the housing within it to rotate, allowing the focusing head to switch between open-source and closed-source states. In the open-source state, the radiation emitted by the multiple radiation sources within the housing exits the beam after passing through the collimator; in the closed-source state, the radiation emitted by the multiple radiation sources within the housing is shielded by the shielding box.

[0004] However, since the current casing is located inside the shielding rod, when the drive assembly rotates the shielding rod, the casing inside the shielding rod also rotates. Furthermore, the radiation from the source is emitted in all directions. Therefore, the shielding box needs to be quite thick to ensure that it can shield the radiation emitted by the source inside the casing from any position it rotates to. This results in a larger focusing head and higher manufacturing costs. Summary of the Invention

[0005] This application provides a focusing head. It solves the problem that the existing shielding box is too thick, resulting in a large focusing head size and high manufacturing cost. The technical solution is as follows:

[0006] A focusing head is provided, comprising: a shielding box, a housing, and a shielding rod;

[0007] The housing is located inside the shielding box, and the housing is used to carry at least one radioactive source;

[0008] The shielding rod is located inside the shielding box and is positioned in the direction of the beam exit of the radiation emitted by the radiation source. The shielding rod has at least one collimating channel, and each collimating channel corresponds to one radiation source.

[0009] The shielding rod is movably connected to the shielding box, and the shielding rod is configured to rotate within the shielding box to keep the focusing head in an open or closed state.

[0010] In one embodiment, the shielding rod rotates within the shielding box, causing the rays emitted by the radiation source to pass through the corresponding collimation channel and be focused, so that the focusing head is in the open-source state; or, the shielding rod rotates within the shielding box, causing the beam exit direction of the rays emitted by the radiation source to be misaligned with the corresponding collimation channel, so that the focusing head is in the closed-source state.

[0011] In one embodiment, the shielding box includes: a shielding box body having a first receiving cavity for carrying a housing and a second receiving cavity for carrying a shielding rod, the first receiving cavity and the second receiving cavity being in communication.

[0012] In one embodiment, the shielding box further includes a support portion located within the first receiving cavity and fixedly connected to the shielding box body, wherein the box body abuts against the support portion.

[0013] In one embodiment, the support includes a first hook that abuts against a first end of the housing and a second hook that abuts against a second end of the housing, the first hook and the second hook being disposed opposite to each other within the first receiving cavity.

[0014] In one embodiment, the shielding box body further has a through hole communicating with the first receiving cavity, the through hole being located on the side of the first receiving cavity away from the second receiving cavity;

[0015] In one embodiment, the shielding box further includes a support rod that passes through the through hole and abuts against the housing.

[0016] In one embodiment, the housing includes a first sub-housing and a second sub-housing, wherein the shape and size of the first sub-housing are the same as those of the second sub-housing.

[0017] In one embodiment, the shielding rod includes: a shielding rod body, and two support shafts detachably connected to both ends of the shielding rod body, the collimation channel being located within the shielding rod body, and the attenuation coefficient of the support shaft being less than the attenuation coefficient of the shielding rod body.

[0018] In one embodiment, the material of the support shaft is the same as the material of the shielding rod body, and the diameter of the support shaft is smaller than the diameter of the shielding rod body;

[0019] Alternatively, the diameter of the support shaft is the same as the diameter of the shielding rod body, but the material of the support shaft is different from the material of the shielding rod body.

[0020] In one embodiment, each end face of the shielding rod body has a groove and a plurality of threaded holes;

[0021] Each of the support shafts has an annular connecting plate on the side wall near the end of the shielding rod body, and each of the support shafts has a boss on the end face near the end of the shielding rod body that mates with the groove, wherein the annular connecting plate has a plurality of connecting through holes that correspond one-to-one with the plurality of threaded holes;

[0022] The shielding rod also includes a plurality of screws corresponding one-to-one with the plurality of connecting through holes, each screw passing through the corresponding connecting through hole and connecting to the corresponding threaded hole.

[0023] In one embodiment, the focusing head further includes a bearing located between the support shaft and the shielding box, the support shaft being movably connected to the shielding box via the bearing.

[0024] In one embodiment, the focusing head further includes a drive assembly located outside the shielding box, the drive assembly being connected to one end of one of the two support shafts away from the shielding rod body, for driving the shielding rod to rotate.

[0025] In one embodiment, when the focusing head switches between the open source state and the closed source state, the driving component is configured to rotate the shielding rod by 90 degrees.

[0026] In one embodiment, the shielding box body includes: a first sub-shielding box and a second sub-shielding box that are slidably connected, the housing being located inside the second sub-shielding box, and the first sub-shielding box being configured to: slide relative to the second sub-shielding box to install the housing inside the second sub-shielding box, or to remove the housing from the second sub-shielding box.

[0027] The beneficial effects of the technical solutions provided in this application include at least the following:

[0028] The focusing head includes a shielding box, a housing, and a shielding rod. The housing is located inside the shielding box and outside the shielding rod. It remains relatively stationary with respect to the shielding box; that is, the housing is fixed within the shielding box. The shielding materials in the focusing head (e.g., the shielding box and shielding rod) provide high shielding efficiency against radiation emitted from the radiation source. This eliminates the need for a thick shielding box, resulting in a smaller shielding box and lower manufacturing costs. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of a focusing head provided in an embodiment of this application;

[0031] Figure 2 Yes, yes Figure 1 A cross-sectional view of the focusing head is shown;

[0032] Figure 3 Yes, yes Figure 1 The diagram shown illustrates the focus head in an open-source state.

[0033] Figure 4 Yes, yes Figure 3 A side view of the focusing head is shown;

[0034] Figure 5 yes Figure 1 The diagram shown illustrates the focusing head in the off-source state.

[0035] Figure 6 yes Figure 5 A side view of the focusing head is shown;

[0036] Figure 7 This is a schematic diagram of another focusing head provided in an embodiment of this application;

[0037] Figure 8 yes Figure 7 A schematic diagram of the shielding box body in the focusing head is shown;

[0038] Figure 9 yes Figure 7 A magnified view of a section at point A in the middle;

[0039] Figure 10 This is a simplified structural diagram of a box body provided in an embodiment of this application;

[0040] Figure 11 This is a schematic diagram of the structure of a shielding rod provided in an embodiment of this application;

[0041] Figure 12 yes Figure 11 An exploded view of the shielding rod is shown.

[0042] Figure 13 This is a schematic diagram of the structure of a driving component provided in an embodiment of this application;

[0043] Figure 14 This is a schematic diagram of the structure of a shielding box provided in an embodiment of this application.

[0044] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0046] Please refer to Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of a focusing head provided in an embodiment of this application. Figure 2 yes Figure 1 The diagram shows a cross-sectional view of the focusing head. The focusing head may include: a shielding box 100, a housing 200, and a shielding rod 300.

[0047] The housing 200 is located inside the shielding box 100 and outside the shielding rod 300. The housing 200 is used to carry at least one radioactive source 201.

[0048] The shielding rod 300 is located inside the shielding box 100 and positioned in the direction of the exit beam of the radiation emitted by the radiation source 201. That is, the shielding rod 300 needs to be positioned in the path of the radiation emitted by the radiation source 201. The radiation emitted by the radiation source 201 inside the box 200 can exit from the exit beam direction, while radiation emitted by the radiation source 201 in other directions can be shielded by the shielding box 100. Here, the exit beam direction of the radiation source 201 is often referred to as the focusing direction of the radiation source 201. The shielding rod 300 has at least one collimating channel 301, each collimating channel 301 corresponding to one radiation source 201. In this application, the number of collimating channels 301 on the shielding rod 300 can be the same as the number of radiation sources 201 in the box 200. For example, when the number of radiation sources 201 and the number of collimating channels 301 are the same, multiple radiation sources 201 correspond one-to-one with multiple collimating channels 301, and the rays emitted by each radiation source 201 can pass through the corresponding collimating channel 301. Understandably, the number of radiation sources 201 in the source box 200 and the number of collimating channels 301 on the shielding rod 300 can also be different, as long as the number of collimating channels 301 is greater than the number of radiation sources 201, and each radiation source 201 has a corresponding collimating channel 301, to ensure that the rays emitted by each radiation source 201 can pass through the corresponding collimating channel 301.

[0049] The shielding rod 300 is movably connected to the shielding box 100. The shielding rod 300 is configured to rotate within the shielding box 100, enabling the focusing head to be in an open-source or closed-source state. In this application, the shielding rod 300 can rotate around a first direction within the shielding box 100, enabling the focusing head to be in an open-source state; the shielding rod 300 can also rotate around a second direction within the shielding box 100, enabling the focusing head to be in a closed-source state. One of the first and second directions is clockwise, and the other is counterclockwise.

[0050] For example, such as Figure 3 and Figure 4 As shown, Figure 3 yes Figure 1 The diagram shown illustrates the focus head in an open-source state. Figure 4 yes Figure 3 The diagram shows a side view of the focusing head. The shielding rod 300 in the focusing head rotates within the shielding box 100, causing the rays emitted by the radiation source 201 within the housing 200 to pass through the corresponding collimation channel 301 and be focused, thus positioning the focusing head in an open state. In this application, the collimation channel 301 in the shielding rod 300 can penetrate the shielding rod 300, and at least one collimation channel 301 in the shielding rod 300 corresponds one-to-one with at least one radiation source 201 in the housing 200. Thus, when the focusing head is in an open state, the rays emitted by each radiation source 201 in the housing 200 can pass through the corresponding collimation channel 301 and be focused at the isocenter point O of the focusing head.

[0051] like Figure 5 and Figure 6 As shown, Figure 5 yes Figure 1 The diagram shown illustrates the focusing head in the off-source state. Figure 6 yes Figure 5 The diagram shows a side view of the focusing head. The shielding rod 300 in the focusing head rotates within the shielding box 100, causing the exit direction of the radiation emitted by the radiation source 201 within the housing 200 to be misaligned with the corresponding collimating channel 301, thus putting the focusing head in a source-off state. The misalignment of the exit direction of the radiation emitted by the radiation source 201 with the corresponding collimating channel 301 means that there is an angle between the exit direction of the radiation emitted by the radiation source 201 and the extension direction of the collimating channel 301. For example, this angle can be 60 degrees, 70 degrees, or 90 degrees, etc. It is understood that this angle can be any angle, and this embodiment does not specifically limit it.

[0052] In this application, at least one collimating channel 301 in the shielding rod 300 corresponds one-to-one with at least one radiation source 201 in the housing 200. Thus, when the focusing head is in the off-source state, the beam exit direction of the radiation emitted by each radiation source 201 in the housing 200 is misaligned with the corresponding collimating channel 301, and the radiation emitted by that radiation source 201 will not pass through the corresponding collimating channel 301, and it can be shielded by the shielding rod 300.

[0053] In this configuration, since the housing 200 is located outside the shielding rod 300, it does not rotate with the shielding rod 300 when the shielding rod 300 rotates. Therefore, the housing 200 can remain relatively stationary with respect to the shielding box 100; that is, the housing 200 is fixed inside the shielding box 100. Thus, the radiation source 201 is fixed relative to the shielding box 100. The radiation source 201 only needs to be effectively shielded at a fixed position by the shielding material in the focusing head (e.g., the shielding box 100 and the shielding rod 300). The shielding material in the focusing head does not need to shield the radiation source 201 at other locations, resulting in high shielding efficiency for the radiation emitted by the radiation source 201. Consequently, effective shielding of the radiation emitted by the radiation source 201 can be achieved without using a thick shielding box 100, resulting in a smaller size and lower manufacturing cost for the shielding box 100.

[0054] In summary, the focusing head provided in this application includes a shielding box, a housing, and a shielding rod. The housing is located inside the shielding box and outside the shielding rod, maintaining a relatively stationary state with respect to the shielding box; that is, the housing is fixed inside the shielding box. The shielding materials in the focusing head (e.g., the shielding box and the shielding rod) have high shielding efficiency against radiation emitted from the radiation source. Effective shielding of the radiation emitted from the radiation source can be achieved without using a shielding box with a large thickness, resulting in a smaller shielding box size and lower manufacturing cost.

[0055] In the embodiments of this application, such as Figure 7 As shown, Figure 7 This is a schematic diagram of another focusing head provided in an embodiment of this application. The shielding box 100 in this focusing head may include: a shielding box body 101. To more clearly show the structure of the shielding box body 101, as shown... Figure 8 As shown, Figure 8 yes Figure 7The diagram shows a schematic of the shielding housing body in the focusing head. The shielding housing body 101 may have a first receiving cavity 101a for supporting the housing 200 and a second receiving cavity 101b for supporting the shielding rod 300. In this application, the cross-sectional shape of the first receiving cavity 101a can be quadrilateral, for example, trapezoidal; the cross-sectional shape of the second receiving cavity 101b can be circular. The first receiving cavity 101a and the second receiving cavity 101b are connected. In this application, the housing 200 in the focusing head can be located within the first receiving cavity 101a of the shielding housing body 101, and the side of the housing 200 is tightly fitted to the inner wall of the first receiving cavity 101a to ensure good stability of the housing 200 within the first receiving cavity 101a. The shielding rod 300 in the focusing head can be located within the second receiving cavity 101b of the shielding box body 101. A certain gap exists between the side of the shielding rod 300 and the inner wall of the second receiving cavity 101b to ensure that the shielding rod 300 can rotate freely within the shielding box 100. This ensures that the casing 200 is located outside the shielding rod 300. Furthermore, since the first receiving cavity 101a and the second receiving cavity 101b are connected, the radiation emitted by the radiation source 201 within the casing 200 can pass through the corresponding collimation channel 301 in the shielding rod 300 before exiting the beam.

[0056] In one embodiment, such as Figure 9 As shown, Figure 9 yes Figure 7 A partial enlarged view at point A. The shielding box 100 in the focusing head may further include a support portion 102 located within the first receiving cavity 101a and fixedly connected to the shielding box body 101, with the housing 200 in the focusing head abutting against the support portion 102 within the first receiving cavity 101a. In this case, the housing 200 is assembled into the first receiving cavity 101a of the shielding box body 101 by placing the housing 200 on the support portion 102.

[0057] For example, the support portion 102 can have various structures. In one possible implementation, the support portion 102 may include an annular support portion that matches the shape of the housing 200. In another possible implementation, the support portion 102 may include two sub-support portions disposed on opposite sides within the first receiving cavity 101a. In yet another possible implementation, the support portion 102 may include a plurality of sub-support portions disposed at intervals within the first receiving cavity 101a, wherein the distance between any two adjacent sub-support portions may be the same or different.

[0058] In all three possible implementation methods described above, the support portion 102 and the shielding box body 101 can be fixedly connected by welding or by screws. This application embodiment does not limit this method.

[0059] It should be noted that the housing 200 in the focusing head abuts against the support 102 in the first receiving cavity 101a, and there must be a certain gap between the housing 200 and the shielding rod 300 in the focusing head. In this way, when the shielding rod 300 in the focusing head rotates to switch the focusing head between open and closed states, it can prevent the shielding rod 300 from contacting the housing 200, thereby ensuring that the shielding rod 300 in the focusing head can rotate freely within the shielding box 100.

[0060] In one embodiment, the housing 200 in the focusing head can be implemented in two ways. In one alternative implementation, such as... Figure 9 As shown, the housing 200 can be a single unit. In another alternative implementation, such as... Figure 10 As shown, Figure 10 This is a simplified structural diagram of a casing provided in an embodiment of this application. The casing 200 may include a first sub-casing 200a and a second sub-casing 200b. The shape and size of the first sub-casing 200a are the same as those of the second sub-casing 200b. Thus, the volume of each individual sub-casing in the casing 200 is small, facilitating transportation. It should be noted that the following embodiments are illustrative examples using a single casing 200 as a whole.

[0061] In this embodiment of the application, the housing 200 in the focusing head may be strip-shaped. The support portion 102 in the first receiving cavity 101a may include: a first hook 102a that abuts against a first end of the housing 200 in the focusing head, and a second hook 102b that abuts against a second end of the housing 200, the first hook 102a and the second hook 102b being disposed opposite to each other in the first receiving cavity 101a.

[0062] For example, the first hook 102a and the second hook 102b can be L-shaped hooks. The L-shaped hook has a first support piece and a second support piece fixedly connected to the first support piece. One side of the first support piece in the L-shaped hook can be fixedly connected to the shielding box body 101, and the other side of the first support piece and one side of the second support piece both abut against the box body 200. In this case, the first end of the box body 200 can be placed on the second support piece in the first hook 102a, and the second end of the box body 200 can be placed on the second support piece in the second hook 102b. Thus, through the cooperation of the first hook 102a and the second hook 102b, the box body 200 can be effectively supported to ensure high stability of the box body 200 within the first receiving cavity 101a.

[0063] It should be noted that the side of the first support piece in the L-shaped hook that abuts against the housing can be a conical surface, that is, the opening of the support part 102 away from the second receiving cavity 101b is larger than the opening of the support part 102 near the second receiving cavity 101b. Additionally, the side of the housing 200 that abuts against the first support piece in the L-shaped hook is also a conical surface, that is, the end face of the housing 200 away from the second receiving cavity 101b is larger than the end face of the housing 200 near the second receiving cavity 101b. This allows the housing 200 to be installed more easily into the first receiving cavity 101a.

[0064] In the embodiments of this application, such as Figure 8 As shown, the shielding box body 101 in the shielding box 100 may also have a through hole 101c communicating with the first receiving cavity 101a, and the through hole 101c is located on the side of the first receiving cavity 101a away from the second receiving cavity 101b.

[0065] In one embodiment, such as Figure 7 As shown, the shielding box 100 in the focusing head may further include a support rod 103. The support rod 103 passes through a through hole 101c in the shielding box body 101, and one end of the support rod 103 can abut against the housing 200. The length of the support rod 103 may be greater than the length of the through hole 101c. The cross-sectional shape of the support rod 103 must be the same as the cross-sectional shape of the through hole 101c. For example, the cross-sectional shape of the support rod 103 may be circular; the cross-sectional shape of the through hole 101c must be circular.

[0066] In the embodiments of this application, such as Figure 9 As shown, the housing 200 in the focusing head may have a groove 202, and one end of the support rod 103 may be located in the groove 202 to abut against the housing 200. In this case, the support rod 103 can abut against the support portion 102 in the first receiving cavity 101a, thereby fixing the housing 200 in the first receiving cavity 101a.

[0067] For example, such as Figure 7As shown, the shielding box 100 in the focusing head may further include a shielding cylinder 104 located within the through hole 101c and sleeved with the support rod 103. The shielding cylinder 104 can be fixedly connected to the shielding box body 101. For example, the shielding cylinder 104 and the shielding box body 101 can be fixedly connected by screws. The shielding cylinder 104 has an internal thread, and the support rod 103 has an external thread that mates with the internal thread. Thus, the support rod 103 can move towards the housing 200 by screwing into the shielding cylinder 104, causing the support rod 103 to abut against the support portion 102 in the first receiving cavity 101a; the support rod 103 can also move away from the housing 200 by screwing out of the shielding cylinder 104 to release the abutment relationship between the support rod 103 and the housing 200, so that the housing 200 can be subsequently removed from the shielding box 100.

[0068] In this embodiment, the shielding cylinder 104 also prevents radiation emitted from the radiation source 201 in the housing 200 from leaking through the gap between the support rod 103 and the through hole 101c. Thus, the shielding cylinder 104 effectively shields the radiation emitted from the radiation source 201, improving the safety of the focusing head.

[0069] In one embodiment, such as Figure 11 and Figure 12 As shown, Figure 11 This is a schematic diagram of the structure of a shielding rod provided in an embodiment of this application. Figure 12 yes Figure 11 An exploded view of the shielding rod is shown. The shielding rod 300 in the focusing head may include: a shielding rod body 302, and two support shafts 303 detachably connected to both ends of the shielding rod body. The attenuation coefficient of the support shafts 303 is less than that of the shielding rod body 302. Because the attenuation coefficient of the shielding rod body 302 is larger, it can effectively shield the radiation emitted by the radiation source 201 when the focusing head is in the off-source state. Furthermore, shielding materials with large attenuation coefficients are more expensive to manufacture, while those with small attenuation coefficients are less expensive. Therefore, when the attenuation coefficient of the support shafts 303 in the shielding rod 300 is less than that of the shielding rod body 302, the manufacturing cost of the shielding rod 300 can be effectively reduced.

[0070] For example, the two support shafts 303 and the shielding rod body 302 can be detachably connected by screws or by clips. This application embodiment does not limit this. In this case, since the shielding rod body 302 and the two support shafts 303 in the shielding rod 300 can be detachably connected, the manufacturing process and installation operation of the shielding rod 300 can be simplified.

[0071] In this application, the shielding rod body 302 and the two support shafts 303 can both be cylindrical. The collimation channel 301 in the shielding rod 300 is located within the shielding rod body 302. In one optional implementation, when the two support shafts 303 and the shielding rod body 302 are made of the same material, for example, both the support shafts 303 and the shielding rod body 302 are made of tungsten, the diameter of each support shaft 303 can be smaller than the diameter of the shielding rod body 302. In this case, since the diameter of each support shaft 303 is smaller than the diameter of the shielding rod body 302, the volume of each support shaft 303 is smaller than the volume of the shielding rod body 302. Thus, the shielding rod 300 has a smaller volume, effectively reducing the manufacturing cost of the shielding rod 300. In another optional implementation, the diameters of the two support shafts 303 can be the same as the diameter of the shielding rod body 302, but the two support shafts 303 and the shielding rod body 302 are made of different materials. Thus, the shielding rod body 302 can be made of a material with good shielding performance, such as tungsten; while the support shaft 303 can be made of a material with lower shielding performance, such as steel. In this case, since the cost of the material with lower shielding performance is lower than that of the material with better shielding performance, the manufacturing cost of the shielding rod 300 can also be reduced when the support shaft 303 is made of a material with lower shielding performance.

[0072] For example, the two support shafts 303 in the shielding rod 300 can have the same shape and size. In this way, the two support shafts 303 in the shielding rod 300 can be manufactured using the same manufacturing process, simplifying the manufacturing difficulty of the shielding rod 300.

[0073] In the embodiments of this application, such as Figure 12 As shown, each end face of the shielding rod body 302 in the shielding rod 300 has a groove 302a and multiple threaded holes (not shown in the figure). Each support shaft 303 has an annular connecting plate 303a on its sidewall near the end of the shielding rod body 302, and each support shaft 303 has a boss 303b that mates with the groove 302a on its end face near the end of the shielding rod body 302. The annular connecting plate 303a has multiple connecting through holes (not shown in the figure) corresponding one-to-one with the multiple threaded holes. The cross-sectional shape of both the groove 302a and the boss 303b can be any shape other than circular. For example, when the cross-sectional shape of the groove 302a is square, the cross-sectional shape of the boss 303b is also square; when the cross-sectional shape of the groove 302a is pentagonal, the cross-sectional shape of the boss 303b is also pentagonal.

[0074] The shielding rod 300 in the focusing head may further include multiple screws (not shown in the figure) corresponding one-to-one with multiple connecting through holes, each screw passing through the corresponding connecting through hole and connecting to the corresponding threaded hole. When the support shaft 303 and the shielding rod body 302 can be connected by screws, the multiple connecting through holes can be evenly distributed circumferentially, and the multiple threaded holes can also be evenly distributed circumferentially. When the multiple connecting through holes and the multiple threaded holes are connected one-to-one, the support shaft 303 and the shielding rod body 302 can be connected by screws passing through the connecting through holes and threaded holes.

[0075] In this configuration, when the support shaft 303 is connected to the shielding rod body 302, the boss 303b can be located within the groove 302a. Multiple connecting through holes on the annular connecting plate 303a in the support shaft 300 correspond one-to-one with multiple threaded holes on one end face of the shielding rod body 302. Thus, screws can be passed through the connecting through holes and threaded holes to connect the support shaft 303 to the shielding rod body 302.

[0076] It should be noted that when the cross-sectional shape of the groove 302a and the boss 303b can be any shape other than a circle, after the boss 303b is located in the groove 302a, the multiple connecting through holes can be connected to the multiple threaded holes without additional debugging operations, so as to simplify the connection process between the shielding rod body 302 and the support shaft 303.

[0077] In one embodiment, the focusing head may further include a bearing 400 located between a support shaft 303 in the shielding rod 300 and a shielding box 100, wherein the support shaft 303 is movably connected to the shielding box 100 in the focusing head via the bearing 400.

[0078] In this configuration, the support shaft 303 in the shielding rod 300 is connected to the shielding box 100 via a bearing 400, and the support shaft 303 is detachably connected to the shielding rod body 302. Therefore, when the support shaft 303 rotates, it can drive the shielding rod body 302 to rotate freely within the shielding box 100 to enable or disable the focusing head.

[0079] In the embodiments of this application, such as Figure 13 As shown, Figure 13 This is a schematic diagram of a drive assembly provided in an embodiment of this application. The focusing head may further include a drive assembly 500 located outside the shielding box 100. The drive assembly 500 is connected to one end of one of the two support shafts 303 away from the shielding rod body 302, and is used to drive the shielding rod 300 in the focusing head to rotate.

[0080] For example, the drive assembly 500 in the focusing head may include: a gear set 501, a drive motor 502, and a reducer (not shown in the figure). The drive motor 502 is connected to the reducer, which is connected to the gear set 501. The gear set 501 is connected to one end of one of the two support shafts 303, away from the shielding rod body 302. The drive motor 502 can drive the support shaft 303 to rotate via the reducer and gear set 501, thereby driving the shielding rod 300 to rotate, so that the focusing head is in an open or closed state. It should be noted that because a reducer is provided in the drive assembly 500, the speed of the gear set 501 can be reduced, thereby increasing the torque of the gear set 501, so that the shielding rod 300 can rotate stably inside the shielding box 100.

[0081] For example, such as Figure 13 As shown, the gear set 501 in the drive assembly 500 may include: a first drive gear 501a, a second drive gear 501b, and a transition gear 501c. The transition gear 501c may mesh with the first drive gear 501a and the second drive gear 501b, respectively. The first drive gear 501a may be connected to the output shaft of the drive motor 502. The second drive gear 501b may be connected to the end of one of the two support shafts 303 away from the shielding rod body 302. In this application, as... Figure 7 As shown, one end of one of the two support shafts 303 away from the shielding rod body 302 is positioned with the second drive gear 501b by a pin 501d. The second drive gear 501b can be connected to the end of one of the two support shafts 303 away from the shielding rod body 302 by a screw 501e.

[0082] In this case, when the drive motor 502 is working, it can sequentially drive the first drive gear 501a, the transition gear 501c, and the second drive gear 501b to rotate, thereby driving the shielding rod 300 to rotate, so that the focusing head is in an open or closed state.

[0083] In one embodiment, such as Figure 7 As shown, the shielding box 100 may have multiple X-ray channels 105. Each of the multiple X-ray channels 105 in the shielding box 100 corresponds one-to-one with a multiple collimation channel 301 in the shielding rod 300. In this case, when the focusing head is in the open-source state, each collimation channel 301 in the shielding rod 300 is connected to the corresponding X-ray channel 105 in the shielding box 100, allowing the X-rays emitted by each radiation source 201 in the housing 200 to pass sequentially through the corresponding collimation channel 301 and the corresponding X-ray channel 105 before being focused. When the focusing head is in the closed-source state, each collimation channel 301 in the shielding rod 300 is misaligned with the corresponding X-ray channel 105 in the shielding box 100.

[0084] In this embodiment, the focusing head may further include a collimator 600, which has multiple sets of collimating holes. Each set of collimating holes includes multiple collimating holes 601, and the apertures of different sets of collimating holes are different. The multiple collimating holes 601 in each set of collimating holes in the collimator 600 correspond one-to-one with the multiple X-ray channels 105 in the shielding box 100, and each collimating hole 601 in the same set of collimating holes in the collimator 600 is connected to the corresponding X-ray channel 105 in the shielding box 100. Thus, when the focusing head is in the open state, the X-rays emitted by each radiation source 201 in the housing 200 can sequentially pass through the corresponding collimating channel 301, the corresponding X-ray channel 105, and the corresponding collimating hole 601 before being focused.

[0085] In this embodiment, when the focusing head switches between open and closed states, the driving component 500 in the focusing head rotates the shielding rod by 90 degrees. In this case, since the shielding rod 300 can directly shield the radiation emitted by the radiation source 201 after the focusing head closes the source, it is only necessary to ensure that the beam direction of the radiation emitted by the radiation source 201 is misaligned with the extension direction of the corresponding collimation channel 301 in the shielding rod 300. The small rotation angle when the driving component 500 in the focusing head rotates the shielding rod by 90 degrees to switch between open and closed states further reduces the time required for the focusing head to open and close the source.

[0086] In one embodiment, such as Figure 14 As shown, Figure 14 This is a schematic diagram of a shielding box provided in an embodiment of this application. The shielding box body 101 in the focusing head may include a first sub-shielding box 101d and a second sub-shielding box 101e that are slidably connected. The housing 200 can be fixed inside the second sub-shielding box 101e. The first sub-shielding box 101d is configured to slide relative to the second sub-shielding box 101e to install the housing 200 inside the second sub-shielding box 101e, or to remove the housing 200 from the second sub-shielding box 101e.

[0087] For example, the shielding box body 101 may also include a pull ring 101f connected to the first sub-shielding box 101d. When the focusing head needs to be loaded with a source, the pull ring 101f can be used to slide the first sub-shielding box 101d away from the second sub-shielding box 101e, so that the mounting port (not shown in the figure) of the housing 200 is aligned with the opening (not shown in the figure) of the second sub-shielding box 101e. After the housing 200 is loaded into the first receiving cavity 101a, the first sub-shielding box 101d and the second sub-shielding box 101e are slidably connected to complete the source loading.

[0088] For example, the first sub-shielding box 101d and the second sub-shielding box 101e can be slidably connected by a guide rail or by a linear bearing. This application embodiment does not limit this.

[0089] In this configuration, the first sub-shield 101d and the second sub-shield 101e within the shielding box 100 of the focusing head can be slidably connected. Therefore, the installation process of the radiation source 201 can be simplified when the focusing head needs to be equipped with a source.

[0090] In one embodiment, the shielding box body 101, shielding cylinder 104, and shielding rod 300 in the above embodiments can be made of shielding material. For example, the material of the shielding box body 101, shielding cylinder 104, and shielding rod 300 may include at least one of lead alloy, metallic steel, and tungsten alloy, or other shielding materials. This application embodiment does not limit this. It should be noted that when the material of the shielding rod 300 can be tungsten alloy, the shielding rod 300 is usually also referred to as a tungsten shielding rod.

[0091] Using the focusing head provided in this embodiment, the drive motor 502 in the drive assembly 500 of the focusing head drives the gear set 501 to rotate. The rotation of the gear set 501 drives the shielding rod 300 to rotate. When the rays emitted by the radiation source 201 in the housing 200 pass sequentially through the collimation channel 301 in the shielding rod 300, the ray channel 105 in the shielding box 100, and the collimation hole 601 in the collimator 600, they are focused, meaning the focusing head is in the open state. When the beam direction of the rays emitted by the radiation source 201 in the housing 200 is misaligned with the collimation channel 301 in the shielding rod 300, the focusing head is in the closed state. When the focusing head is in the closed state, the rays emitted by the radiation source 201 are effectively shielded by the shielding rod 300, thereby reducing the volume of the shielding box 100.

[0092] In summary, the focusing head provided in this application includes a shielding box, a housing, and a shielding rod. The housing is located inside the shielding box and outside the shielding rod, maintaining a relatively stationary state with respect to the shielding box; that is, the housing is fixed inside the shielding box. The shielding materials in the focusing head (e.g., the shielding box and the shielding rod) have high shielding efficiency against radiation emitted from the radiation source. Effective shielding of the radiation emitted from the radiation source can be achieved without using a shielding box with a large thickness, resulting in a smaller shielding box size and lower manufacturing cost.

[0093] This application also provides a gamma knife, including: a rotating frame and a focusing head disposed on the rotating frame. The focusing head can be... Figure 1 or Figure 7 The focusing head is shown.

[0094] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0095] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A focusing head, characterized in that, include: Shielding box, enclosure, and shielding rod; The housing is located inside the shielding box, and the housing is used to carry at least one radioactive source; The shielding rod is located inside the shielding box and is positioned in the direction of the emission of the radiation emitted by the radiation source. The shielding rod has at least one collimation channel, and each collimation channel corresponds to one radiation source. The shielding rod includes: a shielding rod body and two support shafts detachably connected to both ends of the shielding rod body. The collimation channel is located inside the shielding rod body, and the attenuation coefficient of the support shaft is less than the attenuation coefficient of the shielding rod body. The shielding rod is movably connected to the shielding box, and the shielding rod is configured to rotate within the shielding box in a first direction to keep the focusing head in an open state, or rotate within the shielding box in a second direction to keep the focusing head in an off state.

2. The focusing head according to claim 1, characterized in that, The shielding rod rotates inside the shielding box, causing the rays emitted by the radiation source to pass through the corresponding collimation channel and be focused, so that the focusing head is in the open state; Alternatively, the shielding rod rotates within the shielding box, causing the beam direction of the radiation emitted by the radiation source to be misaligned with the corresponding collimation channel, so that the focusing head is in the source-off state.

3. The focusing head according to claim 1, characterized in that, The shielding box includes: a shielding box body, the shielding box body having a first receiving cavity for carrying a housing and a second receiving cavity for carrying a shielding rod, the first receiving cavity and the second receiving cavity being in communication.

4. The focusing head according to claim 3, characterized in that, The shielding box further includes a support portion located within the first accommodating cavity and fixedly connected to the shielding box body, wherein the box body abuts against the support portion.

5. The focusing head according to claim 4, characterized in that, The support includes a first hook that abuts against a first end of the housing and a second hook that abuts against a second end of the housing, the first hook and the second hook being disposed opposite to each other within the first receiving cavity.

6. The focusing head according to claim 4, characterized in that, The shielding box body also has a through hole communicating with the first receiving cavity, and the through hole is located on the side of the first receiving cavity away from the second receiving cavity; The shielding box further includes a support rod that passes through the through hole and abuts against the casing.

7. The focusing head according to any one of claims 1 to 6, characterized in that, The casing includes a first sub-casing and a second sub-casing, wherein the shape and size of the first sub-casing are the same as those of the second sub-casing.

8. The focusing head according to any one of claims 1 to 6, characterized in that, The material of the support shaft is the same as that of the shielding rod body, and the diameter of the support shaft is smaller than that of the shielding rod body. Alternatively, the diameter of the support shaft is the same as the diameter of the shielding rod body, but the material of the support shaft is different from the material of the shielding rod body.

9. The focusing head according to claim 1, characterized in that, Each end face of the shielding rod body has a groove and multiple threaded holes; Each of the support shafts has an annular connecting plate on the side wall near the end of the shielding rod body, and each of the support shafts has a boss on the end face near the end of the shielding rod body that mates with the groove, wherein the annular connecting plate has a plurality of connecting through holes that correspond one-to-one with the plurality of threaded holes; The shielding rod also includes a plurality of screws corresponding one-to-one with the plurality of connecting through holes, each screw passing through the corresponding connecting through hole and connecting to the corresponding threaded hole.

10. The focusing head according to claim 1, characterized in that, The focusing head further includes a bearing located between the support shaft and the shielding box, wherein the support shaft is movably connected to the shielding box via the bearing.

11. The focusing head according to claim 10, characterized in that, The focusing head further includes a drive assembly located outside the shielding box. The drive assembly is connected to one end of one of the two support shafts away from the shielding rod body, and is used to drive the shielding rod to rotate.

12. The focusing head according to claim 11, characterized in that, When the focusing head switches between the open source state and the closed source state, the driving component is configured to rotate the shielding rod by 90 degrees.

13. The focusing head according to any one of claims 1 to 6, characterized in that, The shielding box body includes: a first sub-shielding box and a second sub-shielding box that are slidably connected, the housing being located inside the second sub-shielding box, and the first sub-shielding box being configured to: slide relative to the second sub-shielding box to install the housing inside the second sub-shielding box, or to remove the housing from the second sub-shielding box.

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