CN214158304U - Source emitting mechanism and radiotherapy system - Google Patents

Abstract

The utility model relates to a radiation therapy system technical field specifically discloses a radiation source mechanism and radiation therapy system, this radiation source mechanism is including the collimation body and the carrier, the carrier is used for installing a plurality of radiation sources, the collimation body has a plurality of collimation holes, the relative carrier of collimation physical stamina rotates, can make a plurality of collimation holes and a plurality of radiation source aim at, and the carrier can also drive the collimation body and rotate, thereby no relative motion between the collimation body and the carrier among the treatment process, can guarantee the relative position precision of the collimation body and the carrier, and then guarantee the treatment precision. The radiation therapy system comprises the radiation source mechanism.

Description

Source emitting mechanism and radiotherapy system

Technical Field

The utility model relates to a radiation therapy system technical field especially relates to a radiation source mechanism and radiation therapy system.

Background

With the development of medical technology, radiotherapy is more and more widely applied to the treatment of tumors. The existing radiotherapy system mainly comprises a head gamma knife which utilizes a natural isotope radioactive source cobalt-60 to emit gamma rays and utilizes the radioactivity of the gamma rays to kill tumor cells.

In the prior art, a spherical source distribution type head gamma knife is adopted, a collimating body and a source carrier are coaxially arranged, hundreds of radioactive sources are arranged on the source carrier and are statically focused on one point, and a diseased part of a patient is positioned on a focusing point for focusing and irradiation during treatment.

In view of the above, there is also provided a head gamma knife in a concentrated source distribution manner in the prior art, as shown in fig. 1, a certain number of radioactive sources are arranged in a local area of a source carrier and can be focused on one point, after the collimating channels selected on the collimating body are aligned with the radioactive source channels on the source carrier, the collimating body and the source carrier can move synchronously during the treatment process, so as to achieve multi-angle treatment, and because the number of radioactive sources is reduced, all radioactive sources can be shielded by a small shielding body, thereby effectively reducing the weight.

However, in the prior art, the collimating body and the source carrier are usually in transmission connection with the respective corresponding driving motors through chain transmission assemblies, the transmission chains of the collimating body and the source carrier are different in length, transmission accuracy and transmission rigidity, transmission errors are prone to occur in the continuous rotation process, the selected straight alignment channel cannot be always aligned with the radioactive source channel in the treatment process, movement deviation is prone to occur, the size of a radiation field and a half-shadow are prone to change, treatment accuracy is reduced, and treatment is affected.

Meanwhile, the driving motor corresponding to the collimating body is usually arranged at the rear end of the shielding body, and the distance between the driving motor and the collimating body is far, so that a long transmission shaft is required to be arranged, and the transmission precision and the response speed are easily influenced when the transmission shaft bears large torque.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a: a radiation source mechanism and a radiation therapy system are provided, which can ensure the precision of the synchronous rotation of a collimation body and a carrier source body.

In one aspect, the utility model provides a radiation source mechanism, this collimation body including the carrier that is used for installing a plurality of radiation sources and the collimation body that has a plurality of collimation holes, the collimation physical stamina is relative the carrier rotates, makes a plurality of collimation holes and a plurality of the radiation source is aimed at, just the carrier can also drive the collimation body rotates.

As a preferred embodiment of the radiation source mechanism, the radiation source mechanism further comprises a first driving assembly and a second driving assembly, the first driving assembly has a first starting state and a first stopping state, and the second driving assembly has a second starting state and a second stopping state;

when the first driving assembly is in the first stop state, the first driving assembly can lock the relative position of the collimating body and the source carrier, and when the second driving assembly is in the second start state, the second driving assembly can drive the source carrier to rotate, so that the source carrier drives the collimating body to rotate;

when the second driving assembly is in the second stop state, the second driving assembly can lock the position of the carrier source body, and when the first driving assembly is in the first start state, the first driving assembly can drive the collimating body to rotate relative to the carrier source body.

As a preferred technical scheme of the radiation source mechanism, the first driving component comprises a first motor, a first gear and an inner gear ring, the first motor is fixedly arranged on the collimating body, an output shaft of the first motor is in transmission connection with the first gear, the first gear is meshed with the inner gear ring, the inner gear ring is arranged at one end of the source carrier, and a rotating central line of the first gear and a rotating central line of the collimating body are eccentrically arranged.

As a preferred technical solution of the radiation source mechanism, the radiation source mechanism further includes a first bearing, an inner ring of the first bearing is fixedly connected to the collimating body, and an outer ring of the first bearing is fixedly connected to the source carrying body.

As a preferred technical solution of the radiation source mechanism, the radiation source mechanism further includes a shield sleeved outside the carrier source, and the second driving assembly includes a second motor, a second gear and an outer gear ring;

the second motor is arranged on the shielding body, the second motor is in transmission connection with the second gear, the second gear is meshed with the outer gear ring, and the outer gear ring is arranged at one end of the carrier body.

As a preferred technical solution of the radiation source mechanism, the radiation source mechanism further includes a second bearing, an inner ring of the second bearing is fixedly disposed on the source carrier, and an outer ring of the second bearing is fixedly disposed on the shield.

As a preferred technical solution of the radiation source mechanism, the first driving assembly further includes a first brake provided to the first motor, and the first brake is used for braking or releasing braking of an output shaft of the first motor; the second driving assembly further comprises a second brake arranged on the second motor, and the second brake is used for braking or releasing braking of an output shaft of the second motor.

As a preferred technical solution of the radiation source mechanism, the radiation source mechanism further includes a slip ring fixedly disposed on the shielding body and a carbon brush fixedly disposed on the collimating body, the carbon brush is in sliding contact with an inner circumferential surface of the slip ring, and the carbon brush is electrically connected to the first motor.

As a preferred embodiment of the radiation source mechanism, the radiation source mechanism further comprises a detection piece, and the detection piece is used for detecting the position of the collimating body.

As a preferred technical scheme of the radiation source mechanism, the detection piece is an encoder, the radiation source mechanism further comprises an idler wheel, a rotating shaft of the encoder is fixedly connected with the idler wheel, and the idler wheel is meshed with the inner gear ring.

As a preferred solution of the radiation source mechanism, the collimating body is conical or cylindrical.

In another aspect, the present invention provides a radiation therapy system comprising a radiation source mechanism according to any of the above aspects.

The utility model has the advantages that:

the utility model provides a source mechanism and radiotherapy system, this source mechanism include the collimation body and the carrier, and the carrier is used for installing a plurality of radiation sources, and the collimation body has a plurality of collimation holes, and the relative carrier of collimation physical stamina rotates for a plurality of collimation holes are aimed at with a plurality of radiation sources, and the carrier can also drive the collimation body and rotate, thereby among the treatment process the collimation body with no relative motion between the carrier, can guarantee the relative position precision of the collimation body and carrier, and then guarantee the treatment precision.

The first motor transmits torque through the first gear and the inner gear ring to drive the straight body, and the second motor transmits torque through the second gear and the outer gear ring to drive the carrier source body, so that the transmission precision can be guaranteed.

The first motor is arranged in the collimating body and located in the shielding body, and the inner gear ring is arranged at one end of the carrier source body, so that an output shaft of the first motor can be shorter, and can bear larger torque to ensure transmission precision and response speed.

Drawings

FIG. 1 is a schematic structural diagram of a centralized cloth source in the background art of the present invention;

FIG. 2 is a cross-sectional view of a radiation source mechanism according to an embodiment of the present invention;

FIG. 3 is a schematic view of a radiation source mechanism according to an embodiment of the present invention;

FIG. 4 is a schematic view showing a part of a radiation source mechanism according to an embodiment of the present invention;

fig. 5 is a schematic view of a part of a radiation source mechanism according to an embodiment of the present invention.

In the figure:

1. a collimating body; 11. a main body portion; 111. a collimating aperture; 12. a base plate; 13. a treatment cavity;

2. a carrier;

3. a shield; 31. a through hole; 32. avoiding a void;

41. a second gear; 42. an outer ring gear;

51. a first motor; 52. a first gear; 53. an inner gear ring;

6. an idler pulley;

7. a detection member;

81. a slip ring; 82. a carbon brush;

91. a first bearing; 92. a second bearing;

10. a support member; 101. an accommodating cavity.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Where the terms "first position" and "second position" are two different positions, and where a first feature is "over", "above" and "on" a second feature, it is intended that the first feature is directly over and obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the prior art, as shown in fig. 1, a certain number of radioactive sources are arranged in a local area of a source carrier and can be focused on one point, and after a selected collimating channel on the collimating body is aligned with a radioactive source channel on the source carrier, the collimating body and the source carrier can synchronously move in the treatment process, so that multi-angle treatment can be realized, and the dosage of the radioactive sources can be effectively reduced to reduce the weight. However, in the prior art, the collimating body and the source carrier are usually in transmission connection with the respective corresponding driving motors through chain transmission assemblies, the transmission chains of the collimating body and the source carrier are different in length, transmission accuracy and transmission rigidity, transmission errors are prone to occur in the continuous rotation process, the selected straight alignment channel cannot be always aligned with the radioactive source channel in the treatment process, movement deviation is prone to occur, the size of a radiation field and a half-shadow are prone to change, treatment accuracy is reduced, and treatment is affected.

To ensure that the alignment body and the carrier body remain aligned during treatment, the present embodiment provides a radiation source mechanism. The radiation source mechanism is applied to a radiation therapy system, and the radiation therapy system can be a head gamma knife. As shown in fig. 2 to 3, the radiation source mechanism includes a collimating body 1 and a source carrier 2, the source carrier 2 is used for mounting a plurality of radiation sources, the collimating body 1 has a plurality of collimating holes 111, the collimating body 1 can rotate relative to the source carrier 2, so that the collimating holes 111 are aligned with the radiation sources, and the source carrier 2 can also drive the collimating body 1 to rotate, so that no relative movement exists between the collimating body 1 and the source carrier 2 during the treatment process, the relative position precision of the collimating body 1 and the source carrier 2 can be ensured, and the treatment precision can be ensured.

Specifically, in this embodiment, the inside chamber that holds that is equipped with of carrier 2 to hold the alignment body 1, and alignment body 1 and carrier 2 coaxial setting, alignment body 1 have treatment chamber 13, and the diseased part of human body can hold in treatment chamber 13. In the process that the collimating body 1 rotates independently, the collimating holes 111 and the radioactive sources can be aligned one by one, and beams emitted by the radioactive sources can intersect at a common focus after passing through the collimating holes 111, and the common focus is used for treating the focus of a patient. Of course, other embodiments may also have the collimating holes 111 aligned with a portion of the radiation sources.

Optionally, the radiation source mechanism further comprises a first drive assembly having a first start state and a first stop state and a second drive assembly having a second start state and a second stop state; when the second driving assembly is in the second stop state, the second driving assembly can lock the position of the source carrier 2, and when the first driving assembly is in the first start state, because the position of the source carrier 2 is locked by the second driving assembly at this time, the first driving assembly can drive the collimating body 1 to rotate relative to the source carrier 2, so that the plurality of collimating holes 111 on the collimating body 1 can be aligned with the plurality of radiation sources on the source carrier 2 one by one. When the first driving component is in a first stop state, the first driving component can lock the relative position of the collimating body 1 and the carrier source body 2, and when the second driving component is in a second start state, the second driving component can drive the carrier source body 2 to rotate, and because the relative position of the collimating body 1 and the carrier source body 2 is locked by the first driving component at the moment, the collimating body 1 can be driven to rotate by the carrier source body 2, and the synchronous precision of the collimating body 1 and the carrier source body 2 can be ensured.

Optionally, referring to fig. 2 and 4, the first driving assembly includes a first motor 51, a first gear 52 and an inner gear 53, a housing of the first motor 51 is fixedly disposed on the collimating body 1, an output shaft of the first motor 51 is in transmission connection with the first gear 52, the first gear 52 is engaged with the inner gear 53, the inner gear 53 is disposed at one end of the carrier body 2, and a rotation center line of the first gear 52 is eccentric to a rotation center line of the collimating body 1. In this embodiment, the first motor 51 has a torque, when the first motor 51 stops, the first driving assembly can be in a first stop state, at this time, under the effect of the torque carried by the first motor 51, the torque can be maintained among the first gear ring 53, the first gear 52 and the first motor 51, so as to lock the relative position between the source carrier 2 and the collimating body 1, and when the first motor 51 starts, the first driving assembly can be in a first start state. It should be noted that the first driving assembly includes, but is not limited to, a gear transmission assembly composed of the first gear 52 and the ring gear 53, for example, the gear transmission assembly may also be replaced by a chain transmission assembly or a belt transmission assembly.

Preferably, referring to fig. 4 and 5, the support member 10 is fixedly disposed on the collimating body 1, the housing of the first motor 51 is fixed to the support member 10, and the first gear 52 is fixed to the output shaft of the first motor 51 and rotates to pass through the support member 10 and engage with the ring gear 53. The supporting member 10 has a receiving cavity 101, the first gear 52 is located in the receiving cavity 101, and an opening is formed at one side of the receiving cavity 101, and a portion of the first gear 52 extends out of the opening and is engaged with the inner gear ring 53. In other embodiments, the housing of the first motor 51 may be directly fixed to the collimating body 1.

Specifically, when the first driving assembly is in the first starting state and when the second driving assembly is in the second stopping state, the output shaft of the first motor 51 drives the first gear 52 to rotate, because the rotating center line of the first gear 52 is eccentric to the rotating center line of the collimating body 1, the first gear 52 rotates relative to the ring gear 53 and revolves around the circumferential direction of the ring gear 53, and further the collimating body 1 is driven to rotate by the housing of the first motor 51 and the support 10, so that the collimating body 1 can rotate relative to the source carrier 2, and the collimating holes 111 are aligned with the plurality of radiation sources one by one.

In this embodiment, the first motor 51 transmits torque through a gear transmission assembly formed by the first gear 52 and the ring gear 53, so that transmission accuracy can be effectively ensured; the inner gear ring 53 is fixedly arranged at one end of the source carrier 2, and the first motor 51 is fixed on the collimating body 1 and positioned in the shielding body 3, so that the output shaft of the first motor 51 can be shorter, has stronger rigidity and strength, and provides a foundation for high-speed silent driving.

Optionally, referring to fig. 2 and 4, the radiation source mechanism further includes a shield 3 sleeved outside the source carrier 2, and the second driving assembly includes a second motor (not shown in the drawings), a second gear 41 and an outer gear 42; the second motor is arranged on the shielding body 3, the second motor is in transmission connection with a second gear 41, the second gear 41 is meshed with an outer gear ring 42, and the outer gear ring 42 is arranged at one end of the carrier body 2. In this embodiment, the source carrier 2 is rotatably supported by the shield 3, the second motor has a torque, when the second motor stops, the second driving assembly can be in a second stop state, and at this time, under the action of the torque carried by the second motor, the torque can be kept among the second gear ring 42, the second gear and the second motor, so as to lock the relative position between the source carrier 2 and the shield 3, and since the position of the shield 3 is fixed, the position of the source carrier 2 is fixed at this time; when the second motor is started, the second driving assembly can be in a second starting state. It should be noted that the second driving assembly includes, but is not limited to, a gear transmission assembly composed of the second ring gear 42 and the second gear, for example, the gear transmission assembly can be replaced by a chain transmission assembly or a belt transmission assembly.

Specifically, in this embodiment, the shielding body 3 is provided with the through hole 31, the second motor can be disposed in the through hole 31, and at this time, it can be ensured that the output shaft of the second motor is short, the output shaft of the second motor can bear a large torque, and the output shaft of the second motor is fixedly sleeved with the second gear. In other embodiments, the second gear is also rotatably supported by the shield 3, and a reduction gear set may be further provided between the second motor and the second gear 41. The second motor may also be arranged outside the shield 3 such that the output shaft of the second motor passes through the through hole 31.

Specifically, when the first driving assembly is in the first stop state and when the second driving assembly is in the second start state, the relative positions of the collimating body 1 and the source carrier 2 are locked under the action of the torque of the first motor 51, the second motor drives the second gear to rotate, the second gear drives the outer gear 42 to rotate, the outer gear 42 drives the source carrier 2 to rotate relative to the shielding body 3, and the source carrier 2 simultaneously drives the collimating body 1 to rotate, so that the collimating body 1 and the source carrier 2 synchronously rotate.

Optionally, the inner gear ring 53 and the outer gear ring 42 are separately arranged, and both the inner gear ring 53 and the outer gear ring 42 are fixedly arranged on the carrier 2. Specifically, the outer gear ring 42 and the inner gear ring 53 are both located at the rear end of the carrier 2, and the inner gear ring 53 and the outer gear ring 42 are separately arranged, so that the inner gear ring 53 and the outer gear ring 42 can be maintained independently, and the maintenance cost can be effectively reduced.

As an alternative, the inner ring gear 53 and the outer ring gear 42 may also be integrally disposed, so as to avoid an error in the coaxiality of the inner ring gear 53 and the outer ring gear 42 during the installation process when the inner ring gear 53 and the outer ring gear 42 are separately disposed. Specifically, the inner ring gear 53 and the outer ring gear 42 are coaxially disposed, and the inner ring gear 53 and the outer ring gear 42 are integrally fixed to the rear end of the carrier body 2.

Optionally, the first drive assembly further comprises a first brake for braking or releasing the brake of the output shaft of the first motor 51. Through setting up first stopper, cooperation first motor 51 is from taking the moment of torsion, can guarantee that when first drive assembly is in first stop state, the relative position of alignment body 1 and carrier 2 can be locked steadily to avoid the condition that locking force is not enough when the relative position of alignment body 1 and carrier 2 is locked to the moment of torsion of taking alone through first motor 51. Wherein the first brake may be integrated in the first motor 51. In other embodiments, a first brake may also be provided to the collimating body 1 and used to brake the first gear 52.

Optionally, the second drive assembly further comprises a second brake for braking or releasing the brake of the output shaft of the second motor. Through setting up the second stopper, the second motor of cooperation from the area moment of torsion, when can guaranteeing that second drive assembly is in second stall state, the position of carrier 2 can be locked steadily to the not enough condition of locking force when avoiding simply locking the position of carrier 2 through the second motor from the area moment of torsion. Wherein the second brake may be integrated in the second electric machine. In other embodiments, a second brake may also be used to brake the second gear 41.

Optionally, referring to fig. 2, the radiation source mechanism further includes a first bearing 91, an inner ring of the first bearing 91 is fixedly connected to the collimator body 1, and an outer ring of the first bearing 91 is fixedly connected to the source carrier 2. So set up and to guarantee that the alignment body 1 can rotate smoothly and steadily relative to the carrier source body 2, preferably, first bearing 91 is provided with two to be located the both ends of alignment body 1 length direction respectively, in order to further guarantee that alignment body 1 rotates stably. Of course, in other embodiments, the collimating body 1 and the source carrier 2 can be slidably engaged with each other through a sliding rail and a sliding groove.

Optionally, referring to fig. 2, the radiation source mechanism further includes a second bearing 92, the source carrier 2 is fixedly disposed on an inner ring of the second bearing 92, and an outer ring of the second bearing 92 is fixedly disposed on the shield 3. Further preferably, the number of the second bearings 92 is two, and the two second bearings 92 are disposed at two ends of the carrier 2 in the length direction at intervals, so as to further ensure the stability of the carrier 2 rotating relative to the shield 3. In other embodiments, the source carrier 2 and the shield 3 may be slidably engaged with each other via a sliding track and a sliding groove.

Optionally, referring to fig. 2, 4 and 5, in order to ensure that the plurality of collimating holes 111 on the collimating body 1 and the plurality of radiation sources on the carrier body 2 can be aligned one by one at each treatment, the radiation source mechanism further comprises a detecting member 7, and the detecting member 7 is used for detecting the position of the collimating body 1. Specifically, the collimating body 1 can rotate relative to the source carrier 2 to have a working position and an initial position, when the collimating body 1 is located at the initial position, the plurality of collimating holes 111 and the plurality of radioactive sources are arranged in a staggered manner, when the collimating body 1 is located at the working position, the plurality of radiation sources are aligned with the plurality of collimating holes 111 one by one, before the start of the treatment, the second motor is kept stopped and the first motor 51 is started, the collimating body 1 can be adjusted from the initial position to the working position, and during the rotation of the collimating body 1 relative to the carrier body 2, the position of the collimating body 1 can be detected in real time by the detecting member 7, and when the detecting member 7 detects that the position of the collimating body 1 is in the working position, the controller may control the first motor 51 to stop, so that the collimating body 1 stops in the working position, and the relative positions of the collimating body 1 and the carrier body 2 are kept stable under the self-contained torque of the first motor 51.

Specifically, in this embodiment, the detecting member 7 is an encoder, the radiation source mechanism further includes an idler 6, a supporting member 10 is also disposed between the idler 6 and the collimating body 1, the supporting member 10 is fixedly disposed on the collimating body 1, a housing of the encoder is fixed to the supporting member 10, a rotating shaft of the encoder is fixedly connected to the idler 6, and the idler 6 is meshed with the inner gear ring 53. Specifically, the housing of the encoder is located outside the accommodating cavity 101 of the supporting member 10, the idler 6 is located inside the accommodating cavity 101 of the supporting member 10, the rotating shaft of the encoder rotatably penetrates through the supporting member 10 and is fixedly connected with the idler 6, when the first motor 51 drives the collimating body 1 to rotate, the collimating body 1 drives the idler 6 to rotate around the circumferential direction of the inner gear ring 53, the idler 6 can also rotate and drive the rotating shaft of the encoder to rotate, and the rotating angle of the idler 6 can be directly acquired through the encoder so as to reflect the current position of the collimating body 1. The encoder can send the actual angle value that idler 6 rotated that gathers to the controller, predetermines the angle value of setting in the controller, and the angle value of setting for when the alignment body 1 rotated to the operating position from initial position, the angle that idler 6 rotated, and when the controller judged that the actual angle value that obtains equals the angle value of setting, the controller control first motor 51 stopped. In other embodiments, the detecting element 7 may be replaced by a photoelectric sensor. In the treatment process, the position of the collimating body 1 can be continuously monitored through the detection piece 7, and if the controller judges that the rotation angle value of the idler wheel 6 deviates from the set angle value, the controller sends out an alarm prompt, so that the safety in the treatment process can be ensured.

Optionally, the radiation source mechanism further includes a slip ring 81 fixed to the shield 3 and a carbon brush 82 fixed to the collimator body 1, the slip ring 81 is sleeved on the carbon brush 82, the carbon brush 82 is slidably abutted against an inner circumferential surface of the slip ring 81, and the carbon brush 82 is electrically connected to the first motor 51. It will be appreciated that the slip ring 81 is connected to a controller and/or a power source so that the power source can provide power to the first motor 51 through the slip ring 81 and the carbon brushes 82. Preferably, the carbon brush 82 is also electrically connected to the test piece 7, so that the test piece 7 can transmit control signals via the carbon brush 82 and the slip ring 81. Specifically, when the collimator 1 rotates relative to the source carrier 2, the carbon brush 82 rotates along with the collimator 1, and the slip ring 81 is fixed on the shield 3 and remains stationary, so that the carbon brush 82 rotates around the inner circumferential surface of the slip ring 81, and on the premise of ensuring that the collimator 1 rotates continuously, the power line of the first motor 51 and the signal line of the detecting element 7 are not wound; when the source carrier 2 drives the collimating body 1 to rotate synchronously, the carbon brush 82 rotates along with the collimating body 1, the slip ring 81 is fixed on the shielding body 3 and keeps the position still, the effect can be realized similarly, and in the process that the source carrier 2 drives the collimating body 1 to rotate synchronously, the position of the collimating body 1 can be detected by the accessible detecting piece 7, so that the collimating body 1 and the source carrier 2 are prevented from moving relatively, the radioactive source is ensured to be aligned with the collimating hole 111 more, and the treatment effect is ensured. Further preferably, the shield 3 is provided with a clearance hole 32, a center line of the clearance hole 32 is coaxial with the rotation centers of the source carrier 2 and the collimating body 1, and the slip ring 81 is embedded in an inner wall of the clearance hole 32.

The existing collimating body is generally in a hemispherical shape or a bowl shape, has limited accommodating space, can only accommodate the head of a human body generally and treat tumors of the head of the human body, but cannot treat the neck, shoulders and other parts below the head. In order to increase the treatment range, the radiation source mechanism provided by the embodiment can treat the head, the neck and the shoulders of the human body.

Specifically, the collimating body 1 includes a ring-shaped main body 11, a plurality of collimating holes 111 are disposed in the main body 11, and the main body 11 encloses a treatment cavity 13. The collimating body 1 further comprises a bottom plate 12, which bottom plate 12 closes the bottom end of the treatment cavity 13. The collimating body 1 is conical or cylindrical, in this embodiment, the depth of the treatment cavity 13 of the collimating body 1 is deeper than that of the existing hemispherical or bowl-shaped collimating body, so that the radiation source mechanism can treat the head, neck and shoulders of the human body. And when the head of the patient is positioned in the treatment cavity 13 for treatment, the space of the treatment cavity 13 is spacious, so that anxiety of the patient can be avoided.

In addition, as shown in fig. 1, since the beams have a certain radial width, the beams of two adjacent collimating holes 111 have a certain intersection part from the intersection to the public focus, and the beam dose of the part is high, especially when the beams are overlapped, if the beams fall on the normal tissue outside the focus of the patient, the normal tissue outside the focus of the patient is easily damaged. In this regard, in the present embodiment, by providing the collimating body 1 with a conical shape or a cylindrical shape, the arrangement space of the plurality of collimating holes 111 along the axial direction of the collimating body 1 can be increased to some extent, so as to increase the included angle between two adjacent collimating holes 111, and the length of the intersection of two beams can be reduced, so as to ensure the safety of the treatment.

Specifically, the present embodiment also provides a radiation therapy system, which includes the radiation source mechanism in the above scheme.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (12)

1. A radiation source mechanism, comprising a source carrier (2) for mounting a plurality of radiation sources and a collimating body (1) having a plurality of collimating holes (111), wherein the collimating body (1) is rotatable relative to the source carrier (2) such that a plurality of the collimating holes (111) are aligned with a plurality of the radiation sources, and wherein the source carrier (2) is further capable of driving the collimating body (1) to rotate.

2. The source mechanism of claim 1, further comprising a first drive assembly having a first start state and a first stop state and a second drive assembly having a second start state and a second stop state;

when the first driving assembly is in the first stop state, the first driving assembly can lock the relative position of the collimating body (1) and the source carrier (2), and when the second driving assembly is in the second start state, the second driving assembly can drive the source carrier (2) to rotate, so that the source carrier (2) drives the collimating body (1) to rotate;

when the second driving assembly is in the second stop state, the second driving assembly can lock the position of the source carrier (2), and when the first driving assembly is in the first start state, the first driving assembly can drive the collimating body (1) to rotate relative to the source carrier (2).

3. The source mechanism according to claim 2, characterized in that the first driving assembly comprises a first motor (51), a first gear (52) and an inner gear (53), the first motor (51) is fixed to the collimator body (1), an output shaft of the first motor (51) is in transmission connection with the first gear (52), the first gear (52) is engaged with the inner gear (53), the inner gear (53) is arranged at one end of the source carrier (2), and a rotation center line of the first gear (52) is eccentric to a rotation center line of the collimator body (1).

4. The source mechanism according to claim 3, characterized in that the source mechanism further comprises a first bearing (91), an inner ring of the first bearing (91) being fixedly connected to the alignment body (1) and an outer ring of the first bearing (91) being fixedly connected to the carrier source body (2).

5. The radiation source mechanism according to claim 3, characterized in that it further comprises a shield (3) sleeved outside the carrier (2), and the second drive assembly comprises a second motor, a second gear (41) and an outer gear ring (42);

the second motor set up in shield (3), the second motor with second gear (41) transmission is connected, second gear (41) with outer ring gear (42) meshing, outer ring gear (42) set up in the one end of carrier (2).

6. The source mechanism according to claim 5, characterized in that it further comprises a second bearing (92), the inner ring of the second bearing (92) being fixed to the carrier (2) and the outer ring of the second bearing (92) being fixed to the shield (3).

7. The source mechanism according to claim 5, characterized in that the first drive assembly further comprises a first brake provided to the first motor (51) for braking or braking an output shaft of the first motor (51); the second driving assembly further comprises a second brake arranged on the second motor, and the second brake is used for braking or releasing braking of an output shaft of the second motor.

8. The source mechanism according to any of the claims 5-7, characterized in that the source mechanism further comprises a slip ring (81) fixed to the shield (3) and a carbon brush (82) fixed to the collimator body (1), and the carbon brush (82) is in sliding abutment against an inner circumferential surface of the slip ring (81), the slip ring (81) and the carbon brush (82) being electrically connected to the first motor (51).

9. The source mechanism according to any of the claims 3-7, characterized in that the source mechanism further comprises a detector (7), and that the detector (7) is adapted to detect the position of the collimator body (1).

10. The radiation source mechanism according to claim 9, characterized in that the detector (7) is an encoder, the radiation source mechanism further comprises an idler gear (6), the rotating shaft of the encoder is fixedly connected with the idler gear (6), and the idler gear (6) is meshed with the inner gear ring (53).

11. The source mechanism according to any of the claims 1 to 7, characterized in that the collimator body (1) is conical or cylindrical.

12. A radiation therapy system comprising a source mechanism according to any one of claims 1 to 11.

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