CN102512765A - Multi-blade collimator for medical radiotherapy equipment - Google Patents
Multi-blade collimator for medical radiotherapy equipment Download PDFInfo
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- CN102512765A CN102512765A CN2011104336747A CN201110433674A CN102512765A CN 102512765 A CN102512765 A CN 102512765A CN 2011104336747 A CN2011104336747 A CN 2011104336747A CN 201110433674 A CN201110433674 A CN 201110433674A CN 102512765 A CN102512765 A CN 102512765A
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Abstract
The invention provides a multi-blade collimator for medical radiotherapy equipment. The multi-blade collimator comprises a plurality of blades and corresponding transmission mechanisms for driving the blades, each transmission mechanism comprises a motor, a bevel gear and a spur gear, each bevel gear is directly or indirectly connected to an output shaft of the corresponding motor and is driven to rotate by the motor, each spur gear is disposed between the corresponding bevel gear and the corresponding blade, teeth of each spur gear are always meshed with teeth of the corresponding bevel gear and wheel teeth on the outer edge of the corresponding blade, and two ends of a mandrel of each bevel gear are supported by angular contact bearings. In the technical scheme, the transmission mechanisms not only are simple and compact, but also have high transmission efficiency and transmission precision.
Description
The application of this division is to be that to be called " multi-leaf optical grating that is used for medical radiotherapy apparatus ", application number be dividing an application of 200810240836.3 Chinese invention patent application to December 24 day, in 2008 applying date.
Technical field
The present invention relates to medical radiotherapy apparatus, relate to the multi-leaf optical grating that is used for medical radiotherapy apparatus specifically.
Background technology
Radiotherapy is a kind of important method of treating malignant tumor.At present, the multi-leaf optical grating of increasingly extensive application can make various medical radiotherapy equipment realize conformal therapy efficiently.This conformal therapy can improve the treatment ratio of gains greatly, allows the doctor to leave higher single prescribed dose, thereby can control the development of tumor better, and can allow single to provide tumor lethal dose, plays operating effect.
Conformal radiation therapy is exactly to use multi-leaf optical grating the X ray that linear accelerator produces is carried out beam shaping, produces and the consistent beam shape of tumor outline projection shape, the tumor of body is carried out the non-coplane conform irradiation of gradation, heavy dose, multi-angle.Its indication is extensive, can treat gynecological cancers such as pulmonary carcinoma, constitutional and secondary liver cancer, cancer of pancreas, kidney and adrenal gland neoplasms, uterus and fallopian tube, is particularly suitable for the metering upgrading behind the various parenchymal viscera tumor conventional radiotheraphies.The conformal therapy system generally is made up of body target spot location, frame repeatability assurance system, treatment planning systems and multi-leaf optical grating.
In traditional conformal therapy system, the multi-leaf optical grating that is adopted generally all is manual form, is that the afterbody at each blade is provided with a handle that supplies people's push-and-pull as the one of which, is used for moving blade.Because the irradiation field shape of manual adjustment multi-leaf optical grating wastes time and energy and must suspend therapeutic process, thereby manually multi-leaf optical grating is replaced by automatic multi-leaf optical grating in recent years just gradually.
At present, mostly the automatic multi-leaf optical grating of prior art is monofocal (or claiming single collimation) form.In the monofocal multi-leaf optical grating, the longitudinal cross-section of each blade is made near narrow far away wide trapezoidal generally, and guarantees that two hypotenuses of trapezoid cross section are parallel with the directions of rays of passing through this place.It will be appreciated by those of skill in the art that directional terminology used herein " closely " and " far " all for radiographic source, that is: are " closely " near radiogenic direction, is " far " away from radiogenic direction.Even after the blade shape to the monofocal multi-leaf optical grating carries out other optimal design, can not guarantee that also the end face of blade is parallel with the ray through its place all the time.Therefore, the monofocal multi-leaf optical grating in use can cause significantly launched field penumbra, has a strong impact on radiocurable precision.
Double focusing (or claiming double-collimation) multi-leaf optical grating can guarantee that the end face of each blade is parallel with the ray through blade surface all the time when blade moves to all places with two sidewalls.The radial section (being end surface shape) that the sidewall profile of double focusing blade is made into a fan-shaped section and blade on the whole will be made in one narrow outer wide trapezoidal generally.Obviously, when the position of this sector of adjustment, it is carried out with the radiographic source be the circular motion at center could realize the double focusing effect.
Because the blade quantity of multi-leaf optical grating is numerous, and need be for each blade provides independent drive mechanism in limited space, therefore, those skilled in the art constantly are being devoted to effectively to solve comparatively complicated problems of multi-leaf optical grating drive mechanism at present.
A kind of scheme that in multi-leaf optical grating, adopts screw-nut body to carry out transmission was disclosed among the disclosed Chinese invention patent CN2674197Y on January 26th, 2005.This scheme with the transmission nut in the monofocal grating blade drive mechanism and blade be fixedly connected and motor changes pivotal connection into being fixedly connected of motor cabinet; Also be provided with convex guide rail respectively simultaneously with gear teeth for the inner circumferential edge of each blade and outer circumferential edges; With respectively with two gathering sills up and down that are fixed in the multi-leaf optical grating housing in two guide gears cooperate, thereby finally realize the circular motion of blade.The scheme that this use screw-nut body carries out transmission is more complicated in fact also, and it need be provided with a motor, a rhizoid thick stick, a transmission nut, two convex guide rails, two gathering sills and 4 guide gears etc. for each blade.It is very difficult that above-mentioned these parts reasonably are arranged in the comparatively limited space.And it can also be seen that; In this scheme; Has big stroke if will guarantee blade; Its leading screw must be longer so, and this has just determined this scheme can not be used in basically in the extremely limited built-in multi-leaf optical grating in space, and make that the external multi-leaf optical grating of this scheme of employing is comparatively heavy.
Disclosed on February 1st, 2006 another kind of among the disclosed Chinese invention patent CN2755352Y at multi-leaf optical grating blade transmission scheme.After this scheme utilizes worm-and-wheel gear that rotatablely moving of motor is transformed into rotatablely moving of another vertical axial; Utilize again one with the co-axial gear of turbine come driven vane to do circular motion; And the sidewall that utilizes them between blade carries out relative sliding motion each other as the side sliding surface.The scheme that this use worm-and-wheel gear carries out transmission is some complicacy also, need for each blade be provided with a motor, worm screw, turbine, one with gear teeth of co-axial spur gear of turbine and blade outer rim etc.That is to say; The drive mechanism of this scheme will use two groups of members (being worm screw and turbine, the gear teeth of spur gear and blade outer rim) to carry out transmission between from the motor output shaft to the blade at least; And blade is to utilize rail plate to support each other or the gear teeth through the blade outer rim directly are bearing on the spur gear that carries out transmission; Make that the friction of each member is bigger in the transmission process, not only transmission efficiency is impaired, and causes between blade easily and the wearing and tearing of each driving member; Shortened the service life of whole multi-leaf optical grating, and can cause adverse effect fitting the shape precision.
In a word, in the various double focusing multi-leaf optical gratings of prior art, its drive mechanism is comparatively complicated, transmission efficiency is lower, between blade and possibly exist to be solved now between each driving member than problems such as heavy wears.
Summary of the invention
An object of the present invention is to provide a kind of multi-leaf optical grating, and its drive mechanism through compact is realized the rotation of grating blade.
A further purpose of the present invention is to make said drive mechanism have higher transmission efficiency.
Another further purpose of the present invention be to reduce between blade to the full extent and each building block of drive mechanism or part between wearing and tearing, the service life of improving multi-leaf optical grating.
Particularly, the invention provides a kind of multi-leaf optical grating, it comprises a plurality of blades and the corresponding drive mechanism that is used to drive each blade, and each said drive mechanism comprises a motor; Especially, each drive mechanism also comprises helical gear, and it directly or indirectly is connected to the output shaft of said motor and under the driving of said motor, rotates; And spur gear, it is set between said helical gear and the respective vanes, and keeps engagement with the gear teeth on the outer rim of said helical gear and respective vanes, and the two ends of wherein said helical gear axle are all supported by angular contact bearing.
Further, have at least one V-shaped groove on two sidewalls of each said blade, the end face of said V-shaped groove along the circular arc path from said blade extends to another end face, and the center of rotation coaxial line of said circular arc path and said blade.
Further, have equal number and relative respectively V-shaped groove on the adjacent wall of adjacent two blades.
Preferably; On each sidewall of each said blade, have only two V-shaped grooves; Wherein V-shaped groove is arranged between the outer rim of middle part anti-leak deformation of unevenness and blade of blade, and another V-shaped groove is arranged between the inner edge of middle part anti-leak deformation of unevenness and blade of blade.
Further, the radius in the said V-shaped groove circular arc path of on two sidewalls of each said blade, being extended is different.
Further, between the relative V-shaped groove of the adjacent wall of adjacent two blades, be provided with ball; But also can ball retainer be set for said ball.
Further, said helical gear is connected to the output shaft of said motor and the output shaft coaxial line of said helical gear pivot center and said motor through a shaft coupling.
Further, said multi-leaf optical grating is preferably the double focusing multi-leaf optical grating.
Technical scheme of the present invention has adopted the drive mechanism of compact when realization grating blade with the radiographic source is the rotation at center, have higher transmission efficiency and transmission accuracy.Because simple and compact for structure, multi-leaf optical grating of the present invention not only can be made the external hanging type multi-leaf optical grating but also can make built-in multi-leaf optical grating, is widely used on the various radiotherapy equipments.
In addition, technical scheme of the present invention also is provided with the V-shaped groove that has ball on the sidewall of each grating blade, replaced the sliding friction between traditional blades with rolling friction, has not only improved transmission efficiency, and has significantly reduced interlobate wearing and tearing.
Description of drawings
Though preceding text have briefly been described content of the present invention; But in order to make those skilled in the art can be expressly understood each technical characterictic of the present invention and advantage more; Thereby can come the technical scheme of embodiment of the present invention according to the description of this paper; The back literary composition will further be introduced the specific embodiment of the present invention with reference to accompanying drawing in detail, in said accompanying drawing:
Fig. 1 schematically shows the drive mechanism of multi-leaf optical grating in accordance with a preferred embodiment of the present invention;
Fig. 2 is a plurality of drive mechanisms of multi-leaf optical grating in accordance with a preferred embodiment of the present invention and the schematic partial perspective view that a plurality of vane group is fitted together;
Fig. 3 is the perspective schematic view of the right-hand part multi-leaf optical grating that is assembled by a plurality of drive mechanisms and a plurality of blade of multi-leaf optical grating in accordance with a preferred embodiment of the present invention;
Fig. 4 is in accordance with a preferred embodiment of the present invention the double focusing multi-leaf optical grating schematic, bottom view when in running order.
The specific embodiment
Multi-leaf optical grating of the present invention comprises a plurality of blades 50 and the corresponding drive mechanism that is used to drive each blade 50.As depicted in figs. 1 and 2; In a preferred embodiment, this multi-leaf optical grating is the double focusing multi-leaf optical grating, and wherein each blade 50 has the basic configuration of double focusing blade; Be that each blade is essentially fan-shaped, and the shape of its radial section is narrow outer wide trapezoidal in being on the whole.The radially middle part of this blade has the deformation of unevenness that prevents radiation leakage usually in addition.
Each drive mechanism includes the gear teeth 52 on the outer rim of motor 10, helical gear 30, spur gear 40 and respective vanes 50.Helical gear 30 is connected to the output shaft of motor 10 directly or indirectly, and under the driving of motor 10, rotates.Preferably, helical gear 30 is connected to the output shaft of motor 10 and the output shaft coaxial line of the pivot center of helical gear 30 and motor 10 through a shaft coupling 20.More preferably, at the two ends of the axle of helical gear 30 angular contact bearing can be set respectively supports.Spur gear 40 is set between helical gear 30 and the respective vanes 50; And keep engagement with the gear teeth 52 on the outer rim of helical gear 30 and respective vanes 50, thereby what realize converting helical gear 30 into blade 50 is that the circular arc in the center of circle rotates (or claiming to swing) with the radiographic source.
Have at least one V-shaped groove 54 on two sidewalls of each blade 50, an end face of 50 extends to another end face to this V-shaped groove 54 along the circular arc path from blade, and the center of rotation coaxial line of said circular arc path and blade 50.Have equal number and relative respectively V-shaped groove 54 on the adjacent wall of adjacent two blades 50.Preferably; On each sidewall of each said blade 50, have only two V-shaped grooves 54; Wherein V-shaped groove 54 is arranged between the outer rim of middle part anti-leak deformation of unevenness and blade 50 of blade 50, and another V-shaped groove 54 is arranged between the inner edge of middle part anti-leak deformation of unevenness and blade 50 of blade 50.The radius in the V-shaped groove 54 residing circular arc paths on two sidewalls of each blade 50 is preferably different, and the V-shaped groove 54 on the sidewall of promptly same blade 50 is arranged with the V-shaped groove 54 on another sidewall alternately.
Advantageously, between the relative V-shaped groove 54 of the adjacent wall of adjacent two blades 50, be provided with the ball (not shown); But also can corresponding ball retainer be set for said ball.Like this, just can significantly reduce interlobate frictional force, and make blade 50 obtain suitable supporting diametrically so that be rolling friction relation between the adjacent blades 50.
Those skilled in the art all can recognize, preferably each motor 10 (can be referred to as group of motors) are arranged on outside the roentgenization zone, and the relative position relation of they and each blade 50 (can be referred to as vane group) is as shown in Figure 3.
Fig. 4 shows a complete in running order multi-leaf optical grating.As shown in the drawing, a complete multi-leaf optical grating left and right sides symmetrical configuration.Under the control of the control system of multi-leaf optical grating, symmetric about in two groups of blades some under the driving of motor 10 separately, rotate, finally form required desirable irradiation field.For example in Fig. 4, about the mid portion of two groups of blades respectively have 4 blades that rotation has taken place, formed an irregular irradiation field.
In addition, those skilled in the art can recognize that also multi-leaf optical grating of the present invention also can comprise parts such as fixed mount, with each blade that multi-leaf optical grating is installed on the whole and each drive mechanism etc.Because these characteristics are as well known to those skilled in the art and are easy to realize, thereby this paper will not give unnecessary details it.
Although combine accompanying drawing to describe the preferred embodiments of the present invention in the preceding text, those skilled in the art should recognize that the present invention should not be limited to the particular content of above-mentioned preferred embodiment.Under the situation of the spirit and scope of the invention that does not break away from the accompanying claims qualification, can make various modification and improvement by the foregoing description.
Claims (9)
1. a multi-leaf optical grating that is used for medical radiotherapy apparatus comprises a plurality of blades and the corresponding drive mechanism that is used to drive each blade, and each said drive mechanism comprises a motor, it is characterized in that each drive mechanism also comprises:
Helical gear, it directly or indirectly is connected to the output shaft of said motor and under the driving of said motor, is rotated; With
Spur gear, it is set between said helical gear and the respective vanes, and keeps engagement with the gear teeth on the outer rim of said helical gear and respective vanes, wherein
The two ends of said helical gear axle are all supported by angular contact bearing.
2. multi-leaf optical grating according to claim 1; It is characterized in that: have at least one V-shaped groove on two sidewalls of each said blade; The end face of said V-shaped groove along the circular arc path from said blade extends to another end face, and the center of rotation coaxial line of said circular arc path and said blade.
3. multi-leaf optical grating according to claim 2 is characterized in that: have equal number and relative respectively V-shaped groove on the adjacent wall of adjacent two blades.
4. multi-leaf optical grating according to claim 3; It is characterized in that: on each sidewall of each said blade, have only two V-shaped grooves; Wherein V-shaped groove is arranged between the outer rim of middle part anti-leak deformation of unevenness and blade of blade, and another V-shaped groove is arranged between the inner edge of middle part anti-leak deformation of unevenness and blade of blade.
5. multi-leaf optical grating according to claim 3 is characterized in that: the radius in the circular arc path that said V-shaped groove is extended on two sidewalls of each said blade is different.
6. multi-leaf optical grating according to claim 3 is characterized in that: between the relative V-shaped groove of the adjacent wall of adjacent two blades, be provided with ball.
7. multi-leaf optical grating according to claim 6 is characterized in that: between the relative V-shaped groove of the adjacent wall of adjacent two blades, be provided with ball retainer for said ball.
8. multi-leaf optical grating according to claim 1 is characterized in that: said helical gear is connected to the output shaft of said motor and the output shaft coaxial line of said helical gear pivot center and said motor through a shaft coupling.
9. multi-leaf optical grating according to claim 1 is characterized in that: said multi-leaf optical grating is the double focusing multi-leaf optical grating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104336747A CN102512765A (en) | 2008-12-24 | 2008-12-24 | Multi-blade collimator for medical radiotherapy equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104336747A CN102512765A (en) | 2008-12-24 | 2008-12-24 | Multi-blade collimator for medical radiotherapy equipment |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008102408363A Division CN101757738B (en) | 2008-12-24 | 2008-12-24 | Multiple-blade raster for medical radiotherapeutic equipment |
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| Publication Number | Publication Date |
|---|---|
| CN102512765A true CN102512765A (en) | 2012-06-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011104336747A Pending CN102512765A (en) | 2008-12-24 | 2008-12-24 | Multi-blade collimator for medical radiotherapy equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104658629A (en) * | 2013-11-20 | 2015-05-27 | 上海联影医疗科技有限公司 | Blade driving structure and multi-blade collimator |
| EP2775482A3 (en) * | 2013-03-07 | 2017-08-16 | ELEKTA AB (publ.) | Improvements in or relating to multi-leaf collimators |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002253686A (en) * | 2000-12-26 | 2002-09-10 | Toshiba Corp | Radiotherapeutic apparatus and backlash removor |
| JP2003210594A (en) * | 2002-01-21 | 2003-07-29 | Toshiba Corp | Method of driving leaf and driving device as well as radiotherapy equipment |
| CN1530151A (en) * | 2003-03-13 | 2004-09-22 | ��ʽ���綫֥ | Multiblade collimator |
| CN2755352Y (en) * | 2004-08-10 | 2006-02-01 | 深圳市益普生医疗设备发展有限公司 | Raster blade transmission with multiple blades |
| US20080205599A1 (en) * | 2007-02-23 | 2008-08-28 | Kabushiki Kaisha Toshiba | Radiation therapy apparatus |
-
2008
- 2008-12-24 CN CN2011104336747A patent/CN102512765A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002253686A (en) * | 2000-12-26 | 2002-09-10 | Toshiba Corp | Radiotherapeutic apparatus and backlash removor |
| JP2003210594A (en) * | 2002-01-21 | 2003-07-29 | Toshiba Corp | Method of driving leaf and driving device as well as radiotherapy equipment |
| CN1530151A (en) * | 2003-03-13 | 2004-09-22 | ��ʽ���綫֥ | Multiblade collimator |
| CN2755352Y (en) * | 2004-08-10 | 2006-02-01 | 深圳市益普生医疗设备发展有限公司 | Raster blade transmission with multiple blades |
| US20080205599A1 (en) * | 2007-02-23 | 2008-08-28 | Kabushiki Kaisha Toshiba | Radiation therapy apparatus |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2775482A3 (en) * | 2013-03-07 | 2017-08-16 | ELEKTA AB (publ.) | Improvements in or relating to multi-leaf collimators |
| CN104658629A (en) * | 2013-11-20 | 2015-05-27 | 上海联影医疗科技有限公司 | Blade driving structure and multi-blade collimator |
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Application publication date: 20120627 |