CN207233406U - Hexagon variable field collimator based on Driven by Ultrasonic Motors - Google Patents
Hexagon variable field collimator based on Driven by Ultrasonic Motors Download PDFInfo
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- CN207233406U CN207233406U CN201721091407.5U CN201721091407U CN207233406U CN 207233406 U CN207233406 U CN 207233406U CN 201721091407 U CN201721091407 U CN 201721091407U CN 207233406 U CN207233406 U CN 207233406U
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- 239000002783 friction material Substances 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 238000001959 radiotherapy Methods 0.000 abstract description 22
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- 229910052581 Si3N4 Inorganic materials 0.000 description 1
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model discloses a kind of hexagon variable field collimator based on Driven by Ultrasonic Motors, including pedestal, hexagon guide rail, six blocks, steel band and linear ultrasonic motor stator.First is separately mounted to each side of hexagon guide rail to one end of sixth gear block by its upper hopper chute, and the other end has 60 ° and 120 ° of interior angle；The common edge of block interior angle is contacted with the base of the 60 of adjacent blockers ° of interior angles, and hexagon launched field is surrounded in hexagon guideway centreline；Using synchronous Steel Belt Transmission between block, the linear ultrasonic motor stator driving forward and reverse movement of the first block, by the pulling force of steel band transmission, pulls remaining block to slide at the same time, realizes the scalable of collimater launched field.The utility model proposes variable field collimator it is simple in structure, abrasion is small, and launched field Adjustment precision is high, is conducive to improve the precision of radiotherapy.
Description
Technical field
It the utility model is related to the field of medical instrument technology, and in particular to a kind of six sides based on linear ultrasonic motor driving
Shape variable field collimator.
Background technology
Radiotherapy is a kind of important means for treating tumour, its target is to greatest extent to arrive radioactive ray cover
Tumour（Target area）, and the normal structure of surrounding and organ should be radiated be subject to minimum dose.Collimater is radiotherapy equipment
One of key component, installed in radiographic source accelerator front end, by the shapes and sizes of the scalable control launched field of collimater, with more
The dosage of target area and normal surrounding tissue is separated well, reaches the homogeneous irradiation of dosage in target area, and realization emphasizes that conformal radiation is controlled
The purpose for the treatment of.
U.S. Patent Publication No. discloses a kind of collimator structure for US4450578, the structure using four blocks and
Block edge associates, and is formed centrally within square collimater launched field.Portion of chain in utilizing gear driving synchro structure in periphery,
Two opposite blocks are driven diagonally to move by the belt being connected with chain, you can to force two other block to move shape
Into variable square field.Rotational handle can drive synchronous belt to drive block movement opposing upper and lower, and force left and right opposite
Block move up and down, to form variable square field.Due to the flexibility of belt, chain etc., and only drive wherein two pieces gears
Block, two other block need to drive using frictional force, and launched field precision can be caused to adjust, and not high, driving power is larger, efficiency
The problems such as relatively low, serious wear.
In existing collimator structure, except multi-diaphragm collimator, relatively typically radiated using circular field
Treatment, and hexagon launched field is closest to circular field, when target area is collimated the covering of device Ziye, the EDGE CONTACT of Ziye is transitional
It is good, be conducive to treatment plan formulation.Chinese Patent Application No. is CN 200680001372.X, entitled " radiation appliance and aiming
Variable field collimator disclosed in instrument " is staggered 30 ° using two rows of hexagon collimater spaces, and it is next approximate to form a 12 side shape launched fields
Circular field carries out radiotherapy.Since the collimater is by the way of toothed disc and cam are combined, pass through the song on cam
Wire casing driving block movement, transmission parts increase and gear-driven accuracy is low, curved groove abrasion after can there are backhaul gap so that
Cause complicatedization, the problem of launched field Adjustment precision reduces.
Most collimater is using electric rotating machine as driving in the prior art, coordinates chain or cam by toothed disc
The linear motion that launched field component is blocked in driving is obtained indirectly, realizes the scalable of launched field.They are relative complex there are structure, launched field tune
The defects of whole precision is low.
Linear ultrasonic motor is a kind of New Type of Actuator, elastomer is produced ultrasound using the inverse piezoelectric effect of piezoelectric
Vibration in frequency range, by the rubbing action between elastomer and mover, directly exports the macroscopic motion of mover.With traditional electromagnetism
Motor is compared, linear ultrasonic motor have it is simple and compact for structure, can directly export low-speed high-thrust, response is rapid, does not produce magnetic
, positioning accuracy is high and the particular advantages such as cut off self-lock, be widely used in aerospace, biologic medical and optical precision instrument
The fields such as device.
The content of the invention
Above-mentioned the deficiencies in the prior art are directed to, the purpose of this utility model is to provide one kind to be based on Driven by Ultrasonic Motors
Hexagon variable field collimator, with solve variable field collimator structure is relative complex in the prior art, launched field Adjustment precision is low
The problem of, the utility model is by the way of linear ultrasonic motor driving and synchronous Steel Belt Transmission, there is provided and it is a kind of simple in structure,
The hexagon variable field collimator that field size can change in real time in radiation therapy process.
To reach above-mentioned purpose, the technical solution adopted in the utility model is as follows：
A kind of hexagon variable field collimator based on Driven by Ultrasonic Motors of the utility model, including pedestal, hexagon
Guide rail, first to sixth gear block, steel band, tensioning wheel and linear ultrasonic motor stator；
Hexagon guide rail is regular hexagon framework structure, is fixedly mounted on pedestal；
First to being respectively equipped with the sliding slot of straight line on one end of sixth gear block, and is installed on six sides by the sliding slot respectively
On six sides of shape guide rail, first to sixth gear block along hexagon guide rail corresponding side it is free to slide；Described first to the 6th
The other end of block has interior angle 60 ° and 120 ° a pair of；Waist of the common edge of two interior angles as block, 60 ° of interior angles it is another
Base of the side as block；
The waist of the other end of each block and the base of adjacent blockers are engaged, the two opposite slip；
First is sequentially connected with to sixth gear block by the waist and base, and one six is surrounded at the center of hexagon guide rail
The collimater launched field of side shape；Any one block is slided along the side on the hexagon guide rail of place, drives remaining block along each
The equidirectional slip in side on the hexagon guide rail of place so that collimater launched field shrinks or expands；
Six corners of the hexagon guide rail are respectively set in a tensioning wheel installation pedestal, and steel band passes through tensioning wheel
Tightly, it is centered around hexagon guide rail periphery；Second is connected to one end of sixth gear block by stretching out the part outside hexagon guide rail
On the steel band；The head and the tail both ends of steel band are connected to the first block and stretch out on the convex block outside hexagon guide rail, are set on the convex block
There are a block outer end face parallel with the side on the hexagon guide rail of place, thereon one layer of friction material of coating, and with being fixed on
Linear ultrasonic motor stator contact on pedestal.
Preferably, described one layer of Si of hexagon guide rail surface coating3N4Ceramics, to improve sliding slot and hexagon guide rail
Wearability.
Preferably, the pedestal is equipped with the through hole passed through for ray.
Preferably, the variable field collimator two basic change is in use, spatially, and upper and lower two layers coaxial and be staggered
30 ° of settings so that blocked by another layer of block in the gap between each layer of block；The line ultrasonic electricity of two variable field collimators
Machine stator is driven by same controller, makes the launched field synchronization real-time change of two collimaters.
The beneficial effects of the utility model：
(1) collimator structure of the utility model is simple, occupies little space, and whole collimater utilizes linear ultrasonic motor
Direct linear movement output is that becoming larger or diminishing for collimater launched field can be achieved, without the transmission mechanisms such as gear and leading screw, transmission
Component is few and does not have deceleration device.
(2) using synchronous Steel Belt Transmission, six blocks can be driven by the pulling force of steel band transmission at the same time, without by gear
The frictional force drives transmitted between block, avoid the friction between block, can substantially reduce driving power and reduce and wear, improve collimation
The service life of device.
(3) ultrasound electric machine utilizes the inverse piezoelectric effect of piezoelectric ceramics, and the microdeformation of material is put by mechanical resonance
Greatly, the macroscopic motion of mover is converted into by the coupled drive that rubs.Therefore ultrasound electric machine has higher positioning accuracy, positioning accurate
Degree is up to Nano grade.Steel band inductility, will not stretch easily, can by the cooperation of linear ultrasonic motor and synchronous steel band
Realize the accurate adjustment of launched field, target area is collimated device Ziye, precisely covering is emphasized radiotherapy, is conducive to improve radiotherapy
Precision.
(4) collimater of the utility model can be used in the radiotherapy of various high low energy isotope radioactive sources and x-ray source
In system, particularly for robot radiation therapy system.The characteristic being had by oneself according to ultrasound electric machine, its response time is in Millisecond
Not, so ultrasound electric machine is no inertia when moving back and forth, and fast response time.Driven by Ultrasonic Motors sliding block only need to be passed through
Movement forward or backwards, you can realize the opening launched field of whole collimater within the specific limits（Such as 60mm × 60mm）Carry out fast
The stepless change of speed.Become wild speed to be determined by linear ultrasonic motor, can be fast automatic when carrying out radiotherapy for different target areas
Ground carries out sub- launched field conversion, is conducive to various radiation therapy technologies（Such as conventional radiation therapy technology, stereotactic radiotherapy skill
Art, emphasizes radiation therapy technology etc.）Execution.
Brief description of the drawings
Fig. 1 is the structure diagram of hexagon variable field collimator of the utility model based on Driven by Ultrasonic Motors；
Fig. 2 is the schematic diagram of stop location when the utility model center launched field is zero launched field；
In figure, 1 is pedestal, and 2 be hexagon guide rail, and 3 be the first block, and 31 be block outer end face, and 4 be the second block, and 5 are
Steel band, 6 be tensioning wheel, and 7 be linear ultrasonic motor stator, and 8 be collimater launched field.
Embodiment
For the ease of the understanding of those skilled in the art, the utility model is made with reference to embodiment and attached drawing further
Explanation, the content that embodiment refers to not is restriction to the utility model.
With reference to shown in Fig. 1-Fig. 2, a kind of hexagon variable field collimator based on Driven by Ultrasonic Motors of the utility model,
Including pedestal 1, hexagon guide rail 2, first to sixth gear block, steel band 5, tensioning wheel 6 and linear ultrasonic motor stator 7；
Hexagon guide rail 2 is regular hexagon framework structure, is fixedly mounted on pedestal 1, and pedestal 1 is equipped with to be passed through for ray
Through hole；
First to being respectively equipped with the sliding slot of straight line on one end of sixth gear block, and is installed on six sides by the sliding slot respectively
On six sides of shape guide rail 2, first to sixth gear block along hexagon guide rail 2 corresponding side it is free to slide；Described first to
The other end of six blocks has interior angle 60 ° and 120 ° a pair of；Waist of the common edge of two interior angles as block, 60 ° of interior angles it is another
While the base as block；
The waist of the other end of each block and the base of adjacent blockers are engaged, the two opposite slip；Reference Fig. 1,
Such as：The waist of first block 3 is in contact cooperation with the base 41 of the second block 4；
First is sequentially connected with to sixth gear block by the waist and base, and one is surrounded at the center of hexagon guide rail 2
The collimater launched field of hexagon；Any one block is slided along the side on place hexagon guide rail 2, drives remaining block along respectively
From the equidirectional slip in side on the hexagon guide rail of place so that collimater launched field 8 shrinks or expands；
Six corners of the hexagon guide rail are respectively set in 6 installation pedestal of tensioning wheel, and steel band 5 passes through tensioning wheel
6 tensionings, are centered around hexagon guide rail periphery；Second is connected to one end of sixth gear block by stretching out the part outside hexagon guide rail
On the steel band 5；The head and the tail both ends of steel band 5 are connected to the convex block outside the first block 3 stretching hexagon guide rail（Do not marked in figure
Know）On, the convex block is equipped with a block outer end face 31 parallel with the side on the hexagon guide rail of place, thereon one layer of coating
Friction material, such as Al2O3Ceramics or Si3N4Ceramics, and contacted with the linear ultrasonic motor stator 7 being fixed on pedestal 1.
In preferred embodiment, ray leakage caused by eliminate the gap of six block junctions is penetrated, and two standards can be used
Straight device, spatially, upper and lower two layers coaxial and be staggered 30 ° and set so that the gap between each layer of block is by another layer of block
Block, substantially reduce and leakage penetrate rate, ensure the accuracy of radiotherapy.Meanwhile the linear ultrasonic motor stator of two collimaters by
Same controller driving, makes the launched field synchronization real-time change of two collimaters.
Mover of first block as linear ultrasonic motor, is used cooperatively with linear ultrasonic motor stator, block outer end face
Length be greater than the stroke of the first block when collimater launched field is opened and closed completely；Pass through linear ultrasonic motor stator and block outer end
The friction coupling in face, promotes the first block to move along a straight line.
The course of work of the hexagon variable field collimator based on Driven by Ultrasonic Motors of the utility model is as follows：
Under the driving of the controller of radiotherapy system, the block of the first block of linear ultrasonic motor stator friction-driven
Outer end face, makes the first block be done along the side on the hexagon guide rail of place and moves forward or backwards, pass through the drawing of synchronous steel band transmission
Power, pull second to sixth gear block along each place hexagon guide rail on side slide forward or backwards so that six blocks enclose
Into collimater launched field expand or shrink；The position of block is as shown in Figure 2 when collimater launched field is retracted to zero launched field.Collimater
Be open launched field pace of change according to the requirement of radiotherapy system set, for different target areas carry out radiotherapy when can be quick
Automatically real-time transform field size, beneficial to various radiotherapies（Such as conventional radiation therapy technology, stereotactic radiotherapy skill
Art, emphasizes radiation therapy technology etc.）Implementation.
The utility model concrete application approach is very much, and the above is only the preferred embodiment of the utility model, should
Point out, for those skilled in the art, on the premise of the utility model principle is not departed from, can also make
Go out some improvement, these improvement also should be regarded as the scope of protection of the utility model.
Claims (4)
1. a kind of hexagon variable field collimator based on Driven by Ultrasonic Motors, it is characterised in that led including pedestal, hexagon
Rail, first to sixth gear block, steel band, tensioning wheel and linear ultrasonic motor stator；
Hexagon guide rail is regular hexagon framework structure, is fixedly mounted on pedestal；
First to being respectively equipped with the sliding slot of straight line on one end of sixth gear block, and is led respectively by the sliding slot installed in hexagon
On six sides of rail, first to sixth gear block along hexagon guide rail corresponding side it is free to slide；Described first to sixth gear block
The other end there is a pair of 60 ° and 120 ° of interior angle；Waist of the common edge of two interior angles as block, the another side of 60 ° of interior angles are made
For the base of block；
The waist of the other end of each block and the base of adjacent blockers are engaged, the two opposite slip；
First is sequentially connected with to sixth gear block by the waist and base, and a hexagon is surrounded at the center of hexagon guide rail
Collimater launched field；Any one block is slided along the side on the hexagon guide rail of place, drives remaining block along each place
The equidirectional slip in side on hexagon guide rail；
Six corners of the hexagon guide rail are respectively set in a tensioning wheel installation pedestal, and steel band is tensioned by tensioning wheel,
It is centered around hexagon guide rail periphery；Second to one end of sixth gear block by stretch out the part outside hexagon guide rail be connected to it is described
On steel band；The head and the tail both ends of steel band are connected to the first block and stretch out on the convex block outside hexagon guide rail, and the convex block is equipped with one
A block outer end face parallel with side on the hexagon guide rail of place, thereon one layer of friction material of coating, and with being fixed on pedestal
On linear ultrasonic motor stator contact.
2. the hexagon variable field collimator according to claim 1 based on Driven by Ultrasonic Motors, it is characterised in that described
Pedestal be equipped with the through hole passed through for ray.
3. the hexagon variable field collimator according to claim 1 based on Driven by Ultrasonic Motors, it is characterised in that described
Variable field collimator two basic change in use, spatially, upper and lower two layers is coaxial and be staggered 30 ° and set so that each layer of gear
Blocked by another layer of block in gap between block；The linear ultrasonic motor stator of two variable field collimators is driven by same controller
It is dynamic, make the launched field synchronization real-time change of two collimaters.
4. the hexagon variable field collimator according to claim 1 based on Driven by Ultrasonic Motors, it is characterised in that described
One layer of Si of hexagon guide rail surface coating3N4Ceramics.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721091407.5U CN207233406U (en) | 2017-08-29 | 2017-08-29 | Hexagon variable field collimator based on Driven by Ultrasonic Motors |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721091407.5U CN207233406U (en) | 2017-08-29 | 2017-08-29 | Hexagon variable field collimator based on Driven by Ultrasonic Motors |
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| CN207233406U true CN207233406U (en) | 2018-04-13 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107610799A (en) * | 2017-08-29 | 2018-01-19 | 南京航空航天大学 | Hexagon variable field collimator and its method of work based on Driven by Ultrasonic Motors |
| CN108853754A (en) * | 2018-05-22 | 2018-11-23 | 太丛信息科技（上海）有限公司 | A kind of ray collimator of novel changable bore |
| CN110755757A (en) * | 2019-09-27 | 2020-02-07 | 南京航空航天大学 | Piezoelectric-driven integrated high-precision variable-field collimator |
-
2017
- 2017-08-29 CN CN201721091407.5U patent/CN207233406U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107610799A (en) * | 2017-08-29 | 2018-01-19 | 南京航空航天大学 | Hexagon variable field collimator and its method of work based on Driven by Ultrasonic Motors |
| CN107610799B (en) * | 2017-08-29 | 2024-04-12 | 南京航空航天大学 | Hexagonal variable field collimator based on ultrasonic motor drive and working method thereof |
| CN108853754A (en) * | 2018-05-22 | 2018-11-23 | 太丛信息科技（上海）有限公司 | A kind of ray collimator of novel changable bore |
| CN110755757A (en) * | 2019-09-27 | 2020-02-07 | 南京航空航天大学 | Piezoelectric-driven integrated high-precision variable-field collimator |
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