CN209917099U - Medical linear accelerator treatment head - Google Patents
Medical linear accelerator treatment head Download PDFInfo
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- CN209917099U CN209917099U CN201920252567.6U CN201920252567U CN209917099U CN 209917099 U CN209917099 U CN 209917099U CN 201920252567 U CN201920252567 U CN 201920252567U CN 209917099 U CN209917099 U CN 209917099U
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Abstract
The utility model provides a medical linear accelerator treatment head, the medical linear accelerator treatment head includes diaphragm, treatment head rotary mechanism, the wild subassembly of light, ionization chamber, the piece of uniform accuracy and just accurate awl, treatment head rotary mechanism is connected with the diaphragm and drives the diaphragm rotates, the wild subassembly of light sets up above the diaphragm, the ionization chamber sets up above the wild subassembly of light, the piece of uniform accuracy sets up above the ionization chamber, just accurate awl sets up above the piece of uniform accuracy; the treatment head rotating mechanism comprises a rotating gear disc, a treatment head rotating motor and a transmission gear, the treatment head rotating motor is connected with the transmission gear, the transmission gear is meshed with the rotating gear disc, and the treatment head rotating motor drives the rotating gear disc to rotate through the transmission gear. Can improve the positioning precision, the structural rigidity and the running speed of the treatment head, and enlarge the range of the radiation field, thereby realizing the rapid and accurate treatment.
Description
Technical Field
The utility model relates to the technical field of medical accelerator manufacturing, in particular to a medical linear accelerator treatment head.
Background
In recent years, the therapeutic head of the medical linear accelerator has the functions of providing radiation beams meeting certain requirements on uniformity and symmetry, limiting the radiation beams in a certain area and obtaining radiation fields with different sizes, shapes and angles, which are clinically required. The existing accelerator treatment head has insufficient positioning precision and rigidity of a treatment head rotating assembly in the treatment process, and cannot realize quick and accurate positioning adjustment and treatment.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a medical linear accelerator treatment head, can fix a position fast accurately, and the rotational rigidity is strong.
In order to solve the above technical problem, an embodiment of the present invention provides a medical linear accelerator treatment head, which includes a diaphragm, a treatment head rotating mechanism, a light field assembly, an ionization chamber, an alignment block and a primary alignment cone, wherein the treatment head rotating mechanism is connected with the diaphragm and drives the diaphragm to rotate, the light field assembly is disposed above the diaphragm, the ionization chamber is disposed above the light field assembly, the alignment block is disposed above the ionization chamber, and the primary alignment cone is disposed above the alignment block;
the treatment head rotating mechanism comprises a rotating gear disc, a treatment head rotating motor and a transmission gear, the treatment head rotating motor is connected with the transmission gear, the transmission gear is meshed with the rotating gear disc, and the treatment head rotating motor drives the rotating gear disc to rotate through the transmission gear.
Preferably, the therapeutic head rotating motor is connected with the transmission gear through the right-angle reducer and the worm, the worm is connected with the transmission gear, the transmission gear is a turbine, and the therapeutic head rotating mechanism is provided with an absolute encoder for carrying out closed-loop control on the position of the rotating gear disc.
Preferably, the diaphragm comprises an upper diaphragm and a lower diaphragm, and the upper diaphragm is arranged above the lower diaphragm; the upper diaphragm is transversely opened and closed, and the lower diaphragm is longitudinally opened and closed.
Preferably, the upper diaphragm comprises a first tungsten block, a second tungsten block and a first arc-shaped slide rail, the first tungsten block and the second tungsten block transversely open and close along the first arc-shaped slide rail, the lower diaphragm comprises a third tungsten block, a fourth tungsten block and a second arc-shaped slide rail, the third tungsten block and the fourth tungsten block longitudinally open and close along the second arc-shaped slide rail, the upper diaphragm and the lower diaphragm are respectively provided with a motor absolute encoder and an absolute position magnetic grid, and closed-loop control and mutual monitoring are performed through double-position detection of the absolute position magnetic grid installed on the absolute encoder and the arc-shaped guide rail.
Preferably, the first tungsten block, the second tungsten block, the first arc-shaped slide rail, the third tungsten block, the fourth tungsten block and the second arc-shaped slide rail are concentrically arranged, and the cross section of the tungsten block is fan-shaped.
Preferably, the leveling block is arranged on the multi-station indexing table and is adjusted along with the multi-station indexing table.
Preferably, the multi-station indexing table is adjusted by a three-station indexing table and comprises a ray leveling station, a common placing station and a maintenance station.
Preferably, the multi-station indexing table is connected with the rotary gear disc and comprises a servo motor and a worm gear.
Preferably, the ionization chamber is provided with an ionization chamber slide way, and the ionization chamber is connected in a sliding mode through the ionization chamber slide way.
Preferably, the light field assembly comprises a reflector and a cold light source, and the reflector and the cold light source are arranged in a 45-degree angle in parallel.
The utility model discloses an above-mentioned technical scheme's beneficial effect as follows:
in the above scheme, through setting up diaphragm, treatment head rotary mechanism, the wild subassembly of light, ionization chamber, the accurate piece of equalling and just accurate awl, treatment head rotating electrical machines drives rotatory pinion disc through drive gear and rotates, can improve treatment head positioning accuracy, adjustment rigidity and speed, guarantees quick accurate treatment.
Drawings
Fig. 1 is a schematic cross-sectional structure view of a treatment head of a medical linear accelerator according to an embodiment of the present invention;
fig. 2 is a schematic cross-sectional structure view of a treatment head of a medical linear accelerator according to an embodiment of the present invention;
fig. 3 is a schematic view of a treatment head structure of a medical linear accelerator according to an embodiment of the present invention.
[ main component symbol description ]
A diaphragm 1;
a therapeutic head rotating mechanism 2;
a light field component 3;
an ionization chamber 4;
an equalizing block 5;
a primary collimating cone 6;
a rotary gear disk 7;
a therapeutic head rotating motor 8;
a transmission gear 9;
a gear bearing 10;
an upper diaphragm 11;
a lower diaphragm 12;
a first tungsten block 13;
a second tungsten block 14;
a first arcuate slide track 15;
a third tungsten block 16;
a fourth tungsten block 17;
a second arcuate slide rail 18;
a multi-station index table 19;
a mirror 20;
a cold light source 21.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 to 3, the medical linear accelerator treatment head of the embodiment of the present invention comprises a diaphragm 1, a treatment head rotating mechanism 2, a light field component 3, an ionization chamber 4, an equalizing block 5 and a collimating cone 6, wherein the treatment head rotating mechanism 2 is connected with the diaphragm 1 and drives the diaphragm 1 to rotate, the light field component 3 is disposed above the diaphragm 1, the ionization chamber 4 is disposed above the light field component 3, the equalizing block 5 is disposed above the ionization chamber 4, and the collimating cone 6 is disposed above the equalizing block 5;
the treatment head rotating mechanism 2 comprises a rotating gear disc 7, a treatment head rotating motor 8 and a transmission gear 9, the treatment head rotating motor 8 is connected with the transmission gear 9, the transmission gear 8 is meshed with the rotating gear disc 7, and the treatment head rotating motor 8 drives the rotating gear disc 7 to rotate through the transmission gear 8.
Specifically, the treatment head rotating motor 8 is connected with a transmission gear 9 through a right-angle reducer and a worm, the worm is connected with the transmission gear, the transmission gear 9 is a turbine, and the treatment head rotating mechanism 2 is provided with an absolute encoder for carrying out closed-loop control on the position of a rotating gear disc.
The treatment head rotating mechanism 2 can be supported by a four-point contact gear bearing 10, the treatment head rotating motor is a servo motor, the servo motor drives a rotating gear disc 7 through a right-angle reducer and a worm gear, so that the treatment head forms a radiation field with any angle at an isocenter plane, and meanwhile, an absolute encoder is arranged for closed-loop control, so that the angle positioning precision of the treatment head at the isocenter plane is as high as 0.1 degree. The primary collimating cone 6 can be fixed on the stator of the therapy head rotating mechanism 2 and is used for blocking the primary radiation generated by the radiation source outside the maximum radiation field range.
The utility model discloses medical linear accelerator treatment head, through setting up diaphragm, treatment head rotary mechanism, the wild subassembly of light, ionization chamber, all accurate piece and just accurate awl, treatment head rotating electrical machines passes through drive gear and drives rotatory toothed disc rotation, can improve treatment head positioning accuracy, adjustment rigidity and speed, guarantees quick accurate treatment.
Specifically, the diaphragm 1 includes an upper diaphragm 11 and a lower diaphragm 12, and the upper diaphragm 11 is disposed above the lower diaphragm 12; the upper diaphragm 11 is transversely opened and closed, and the lower diaphragm 12 is longitudinally opened and closed. Go up diaphragm 11 and include first tungsten piece 13, second tungsten piece 14, first arc slide rail 15, first tungsten piece 13 and second tungsten piece 14 transversely open and shut along first arc slide rail 15, diaphragm 12 includes third tungsten piece 16, fourth tungsten piece 17, second arc slide rail 18 down, third tungsten piece 16 and fourth tungsten piece 17 vertically open and shut along second arc slide rail 18, it carries out closed-loop control through absolute type encoder with diaphragm 12 down to go up diaphragm 11. Preferably, the first tungsten block 13, the second tungsten block 14, the first arc-shaped slide rail 15, the third tungsten block 16, the fourth tungsten block 17 and the second arc-shaped slide rail 18 are concentrically arranged.
The cross sections of the four tungsten blocks are fan-shaped, can independently rotate around the radiation source as a center and conform to the movement mode, so that the structure is compact. Can form the arbitrary rectangle radiation field that is not more than 400mm in isocentre plane department through opening and shutting of last diaphragm and lower diaphragm, go up the diaphragm simultaneously and all design with lower diaphragm and have 2 position detection of absolute position magnetic grid on motor absolute encoder and the arc slide rail, the latter is used for closed-loop control, the former is used for detecting for its motion positioning accuracy in isocentre plane department is superior to 0.1mm, can avoid a certain position sensor to make mistakes simultaneously, improves the reliability greatly.
Specifically, the leveling block 5 is arranged on the multi-station indexing table 19 and is adjusted along with the multi-station indexing table. The multi-station indexing table 19 is adjusted by a three-station indexing table and comprises a ray leveling station, a common placing station and a maintenance station. Preferably, the multi-station indexing table 19 is connected with the rotary gear disc 7, and the multi-station indexing table 19 comprises a servo motor and a worm gear.
The equalizing block is arranged below the initial collimating cone, and the X-ray intensity distribution is equalized by utilizing different absorption amounts of different thicknesses of substances to radiation, so that the dose distribution meeting the clinical treatment requirement is obtained. The even piece can pass through worm gear drive by servo motor, and is rotatable to different angles to realize the switching of ray leveling station, ordinary station and the maintenance station of putting, the flexibility ratio is higher, and the function is more comprehensive.
Preferably, the ionization chamber 4 is provided with an ionization chamber slide, and the ionization chambers are slidably connected through the ionization chamber slide. The light field assembly 3 comprises a reflector 20 and a cold light source 21, wherein the reflector 20 and the cold light source 21 are arranged in parallel.
An ionization chamber is disposed below the collimator block for measuring an amount of radiation related to an absorbed dose. The ionization chamber can be provided with a linear guide rail, and the ionization chamber can be manually slid out to be convenient for maintenance and reset.
The light field assembly is used for visualizing the radiation field before treatment and is arranged below the ionization chamber and at the arc-shaped space formed by the upper diaphragm, so that the structure is compact. The light field assembly can be made of various materials, so that the light field assembly has uniform ray absorption rate, and the cold light source can be manually adjustable in three directions, so that the cold light source is symmetrical to the reflector.
The drag chain component is used for protecting and dragging the cable and is arranged in the inner cavity of the therapeutic head rotating mechanism, so that the structure is compact and concise. Drag chain baffle has been designed to drag chain part inner wall, guarantees that the drag chain all swings in the set space when treatment head is in each state.
The utility model discloses medical linear accelerator treatment head has following advantage:
the therapeutic head rotating mechanism is supported by a four-point contact gear bearing and has good angular rigidity; the servo motor is driven by a first-stage right-angle reducer and a first-stage worm gear, so that the transmission clearance is small; an absolute encoder is designed to perform closed-loop control, so that the control precision is ensured; the three points simultaneously ensure the positioning precision and the running stability of the rotating component. The therapeutic head rotating mechanism is designed with a large window, is matched with rotation, and can be simultaneously used for uniform block modification, ionization chamber disassembly, reflector wiping and cold light lamp adjustment.
2. The equal accurate piece part is rotated to different angles through the equal monoblock of worm gear drive by servo motor to realize the switching of ray average station, ordinary station and maintenance station, have multi-functional and good maintainability. Through the Hall sensor, the repeated positioning precision of the ray leveling station is ensured.
3. The light field component is made of various materials, so that the light field component has uniform ray absorption rate, and the ray uniformity in the radiation field is ensured. The reflector is fixed in the arc space of the upper diaphragm part, so that the structure is compact.
4. 4 tungsten blocks of the diaphragm can independently rotate around the radiation source as a center, and any rectangular radiation field with the size not larger than 400mm can be formed at the isocentric plane; the gear-type planetary gear transmission mechanism is supported by an arc-shaped guide rail containing gears, and meshed pinions are driven by a servo motor through a planet and right-angle reducer, so that the gear-type planetary gear transmission mechanism has a large reduction ratio and ensures sufficient output torque; meanwhile, an absolute encoder is designed to perform closed-loop control, so that the motion positioning precision of the encoder at the isocenter plane is as high as 0.1 mm. The tungsten door is in arc design and conforms to the movement mode, so that the structure is compact.
5. The drag chain is designed in the inner cavity of the therapeutic head rotating mechanism, so that the structure is compact and concise.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The treatment head of the medical linear accelerator is characterized by comprising a diaphragm, a treatment head rotating mechanism, a light field component, an ionization chamber, an alignment block and an alignment cone, wherein the treatment head rotating mechanism is connected with the diaphragm and drives the diaphragm to rotate;
the treatment head rotating mechanism comprises a rotating gear disc, a treatment head rotating motor and a transmission gear, the treatment head rotating motor is connected with the transmission gear, the transmission gear is meshed with the rotating gear disc, and the treatment head rotating motor drives the rotating gear disc to rotate through the transmission gear.
2. The linear accelerator treatment head according to claim 1, wherein the treatment head rotating motor is connected with a transmission gear on a turntable bearing through a right-angle reducer and a worm, the worm is connected with the transmission gear, the transmission gear is a turbine, and the treatment head rotating mechanism is provided with an absolute encoder for performing closed-loop control on the position of a rotating gear disc.
3. The linac treatment head of claim 1, wherein the diaphragm comprises an upper diaphragm and a lower diaphragm, the upper diaphragm being disposed above the lower diaphragm; the upper diaphragm is transversely opened and closed, and the lower diaphragm is longitudinally opened and closed.
4. The linear accelerator treatment head according to claim 3, wherein the upper diaphragm comprises a first tungsten block, a second tungsten block and a first arc-shaped slide rail, the first tungsten block and the second tungsten block transversely open and close along the first arc-shaped slide rail, the lower diaphragm comprises a third tungsten block, a fourth tungsten block and a second arc-shaped slide rail, the third tungsten block and the fourth tungsten block longitudinally open and close along the second arc-shaped slide rail, and the upper diaphragm and the lower diaphragm are respectively provided with a motor absolute encoder and an absolute position magnetic grid.
5. The linac therapy head according to claim 4, wherein the first tungsten block, the second tungsten block, the first arc-shaped slide rail, the third tungsten block, the fourth tungsten block and the second arc-shaped slide rail are concentrically arranged, and the cross-sectional shape of the tungsten blocks is a sector.
6. The linac treatment head of claim 1, wherein the leveling block is disposed on the multi-station index table and is adjusted therewith.
7. The linac treatment head of claim 6, wherein the multi-station index table is a three-station index table comprising a beam leveling station, a normal placement station, and a maintenance station.
8. The linac treatment head according to claim 7, wherein the multi-station indexing table is connected with a rotary gear wheel, the multi-station indexing table comprising a servo motor through a worm gear.
9. The linac therapy head according to claim 1, characterized in that the ionization chamber is provided with ionization chamber slides, through which the ionization chambers are slidably connected.
10. The linac therapy head according to claim 1, wherein the light field assembly comprises a mirror and a cold light source that are disposed at a 45 degree angle in elevation parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920252567.6U CN209917099U (en) | 2019-02-28 | 2019-02-28 | Medical linear accelerator treatment head |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920252567.6U CN209917099U (en) | 2019-02-28 | 2019-02-28 | Medical linear accelerator treatment head |
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| Publication Number | Publication Date |
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| CN209917099U true CN209917099U (en) | 2020-01-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920252567.6U Active CN209917099U (en) | 2019-02-28 | 2019-02-28 | Medical linear accelerator treatment head |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109966658A (en) * | 2019-02-28 | 2019-07-05 | 玛西普医学科技发展(深圳)有限公司 | A kind of clinac treatment head |
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2019
- 2019-02-28 CN CN201920252567.6U patent/CN209917099U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109966658A (en) * | 2019-02-28 | 2019-07-05 | 玛西普医学科技发展(深圳)有限公司 | A kind of clinac treatment head |
| CN109966658B (en) * | 2019-02-28 | 2024-05-10 | 玛西普医学科技发展(深圳)有限公司 | Medical linear accelerator treatment head |
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