CN219290464U - Fine adjustment positioning device of secondary scattering filter for medical accelerator - Google Patents
Fine adjustment positioning device of secondary scattering filter for medical accelerator Download PDFInfo
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- CN219290464U CN219290464U CN202222529267.2U CN202222529267U CN219290464U CN 219290464 U CN219290464 U CN 219290464U CN 202222529267 U CN202222529267 U CN 202222529267U CN 219290464 U CN219290464 U CN 219290464U
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Abstract
The utility model discloses a fine adjustment positioning device of a secondary scattering filter for a medical accelerator, and belongs to the technical field of radiotherapy apparatuses. The device comprises a mounting plate, a transition plate, a loosening-preventing spring screw, a reset spring and a precise fine tooth spring screw; the transition plate is arranged in the guide slot of the mounting plate, the loose spring-free screw passes through the kidney-shaped hole on the transition plate and then is connected to the mounting plate, the transition plate can move back and forth along the direction of the guide slot in the mounting plate, the two ends of the mounting plate corresponding to the movement direction of the transition plate are respectively provided with the precise fine tooth spring screw and the reset spring, the position of the transition plate along the left and right direction is regulated by the relative acting force of the precise fine tooth spring screw and the reset spring, and after the regulation is finished, the relative position of the transition plate and the mounting plate is fixed by the loose spring-free screw. The utility model can realize accurate fine adjustment, so that the secondary scattering filter center is consistent with the electron beam flow center.
Description
Technical Field
The utility model belongs to the technical field of radiotherapy apparatuses, and particularly relates to a fine adjustment positioning device of a secondary scattering filter for a medical accelerator.
Background
Electron beams are well suited for the treatment of superficial and deviated tumors in tumor radiotherapy. At present, a medical linear accelerator generally adopts electron beams with energy of 4-20 MeV as an irradiation source, and a primary scattering filter and a secondary scattering filter are required to be used for correction, so that the medical linear accelerator can obtain dose distribution meeting certain flatness and symmetry requirements at a treatment position and can be used for clinical treatment.
In general, the secondary scattering filter is fixed on the collimating cone, and the collimating cone is affected by the processing precision and has errors, so that the center of the secondary scattering filter is not completely ensured to be consistent with the center of the electron beam flow, which brings inconvenience to the subsequent electron beam index debugging.
Disclosure of Invention
In view of this, the present utility model provides a fine adjustment positioning device for a secondary scatter filter for a medical accelerator, which fine adjusts the position of the secondary scatter filter in the right-left direction by the positioning device so that the center thereof coincides with the center of the electron beam flow after the direction of the secondary scatter filter GT (gun and target) is aligned with the direction of the beam GT.
A fine adjustment positioning device of a secondary scattering filter for a medical accelerator comprises a mounting plate, a transition plate, a spring loosening prevention screw, a return spring and a precise fine tooth spring screw;
the mounting plate is provided with a linear guide groove matched with the transition plate;
a waist-shaped hole is formed in the transition plate, and the waist-shaped Kong Gongsong does not pass through a spring screw;
the transition plate is arranged in the guide slot of the mounting plate, the loose spring-free screw passes through the kidney-shaped hole on the transition plate and then is connected to the mounting plate, the transition plate can move back and forth along the direction of the guide slot in the mounting plate in the unfixed state of the loose spring-free screw, the two ends of the mounting plate corresponding to the movement direction of the transition plate are respectively provided with the precise fine tooth spring screw and the reset spring, the precise fine tooth spring screw is in rigid contact with the transition plate, the reset spring is in elastic contact with the transition plate, the position of the transition plate along the left and right directions is regulated through the relative acting force of the precise fine tooth spring screw and the reset spring, and the relative position of the transition plate and the mounting plate is fixed through the loose spring-free screw after the regulation is completed.
Further, the mounting plate is provided with a rectangular groove, and a guide groove for mounting the transition plate is processed on the side wall of the rectangular groove.
Further, the tooth distance of the precise fine tooth spring screw is 0.4mm, the screw head of the precise fine tooth spring screw is divided into eight equal parts in the circumferential direction and marked, and the screw head is equivalent to 45 degrees of screw rotation and 5 threads of displacement.
Further, the bottom surface of the transition plate is provided with a concave structure.
Further, the waist-shaped holes on the transition plate are four in number, and the four waist-shaped holes are symmetrically distributed by taking the moving direction of the transition plate as the center.
The beneficial effects are that:
1. according to the utility model, the position of the transition plate along the left-right direction is regulated by the relative acting force of the precise fine tooth spring screw and the reset spring, after the regulation is finished, the transition plate and the mounting plate are fixed by loosening the spring screw, and the reset spring exerts acting force on the transition plate at any moment in the regulation process, so that the fit gap between the transition plate and the mounting plate can be eliminated, the difficulties in processing, assembling and debugging of the collimation cone and the system thereof can be reduced, and the production cost is reduced.
2. The screw head of the precise fine tooth spring screw is divided into eight equal parts in the circumferential direction and marked, and the precise linear displacement regulated can be visually reflected by utilizing the rotation angle, so that the position of the secondary scattering filter on the collimating cone can be precisely regulated, the beam center and the secondary scattering filter center can be conveniently and rapidly superposed, the optimal leveling effect is achieved, and the production and performance indexes of the accelerator are increased by one step.
3. The bottom surface of the transition plate is provided with the concave structure, so that the contact area between the transition plate and the mounting plate is reduced, the sliding friction force between the transition plate and the mounting plate is reduced, and the adjustment process is smoother.
Drawings
FIG. 1 is a three-dimensional block diagram of a fine tuning positioning device according to the present utility model;
FIG. 2 is a top view of the fine tuning positioning device of the present utility model;
FIG. 3 is a front view of the present utility model;
FIG. 4 is a cross-sectional view of the present utility model;
FIG. 5 is a right side view of the present utility model;
wherein: 1-transition plate, 2-mounting plate, 3-loosening-preventing spring screw, 4-reset spring and 5-precise fine tooth spring screw.
Detailed Description
The utility model will now be described in detail by way of example with reference to the accompanying drawings.
The utility model provides a fine adjustment positioning device of a secondary scattering filter for a medical accelerator, which enables the center of the secondary scattering filter to be consistent with the center of an electron beam flow by adjusting the position of a secondary scattering filter LR when the position of the secondary scattering filter GT is shifted to a specified position.
As shown in fig. 1 to 5, the fine adjustment positioning device of the utility model comprises a transition plate 1, a mounting plate 2, a loosening-preventing spring screw 3, a return spring 4 and a precise fine tooth spring screw 5.
Wherein, a rectangular groove is arranged on the mounting plate 2, a guide groove for mounting the transition plate is processed on the side wall of the rectangular groove, the guide groove is used for the transition plate 1 to move along the LR direction, and the transition plate 1 is provided with four kidney-shaped holes with adjustable LR direction. The pitch of the precise fine tooth spring screw 5 is 0.4mm, the screw head is divided into eight equal parts in the circumferential direction and marked, which is equivalent to 45 degrees of rotation of the precise fine tooth spring screw 5, and the linear displacement generated by the precise fine tooth spring screw is 5 wires.
The transition plate 1 is placed in a guide groove on the mounting plate 2, a precise fine tooth spring screw and a reset spring 4 are respectively arranged at two ends of the mounting plate corresponding to the movement direction of the transition plate, the precise fine tooth spring screw 5 is in rigid contact with the transition plate 1, the reset spring 4 is in elastic contact with the transition plate 1, and the direction of the transition plate 1LR is adjustable through the acting force of the precise fine tooth spring screw 5 opposite to the reset spring 4. After the adjustment, the transition plate 1 is fixed on the mounting plate 2 by using the spring screws 3 which are not loosened.
Working principle: the secondary scattering filter is fixed on the transition plate 1, the LR and GT direction displacement deviation of the secondary scattering filter center and the beam center is determined according to the uniformity curve tested by software, the alignment of the secondary scattering filter and the beam GT direction is ensured by adjusting the GT direction position of the treatment head, then the precise fine tooth spring screw 5 is adjusted to move the transition plate 1 to enable the LR direction of the secondary scattering filter to be displaced to the beam center, and finally, the secondary scattering filter center is consistent with the beam center.
In summary, the above embodiments are only preferred embodiments of the present utility model, and are not intended to limit the scope of the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (5)
1. The fine-tuning positioning device of the secondary scattering filter for the medical accelerator is characterized by comprising a mounting plate, a transition plate, a loose spring screw, a reset spring and a precise fine tooth spring screw;
the mounting plate is provided with a linear guide groove matched with the transition plate;
a waist-shaped hole is formed in the transition plate, and the waist-shaped Kong Gongsong does not pass through a spring screw;
the transition plate is arranged in the guide slot of the mounting plate, the loose spring-free screw passes through the kidney-shaped hole on the transition plate and then is connected to the mounting plate, the transition plate can move back and forth along the direction of the guide slot in the mounting plate in the unfixed state of the loose spring-free screw, the two ends of the mounting plate corresponding to the movement direction of the transition plate are respectively provided with the precise fine tooth spring screw and the reset spring, the precise fine tooth spring screw is in rigid contact with the transition plate, the reset spring is in elastic contact with the transition plate, the position of the transition plate along the left and right directions is regulated through the relative acting force of the precise fine tooth spring screw and the reset spring, and the relative position of the transition plate and the mounting plate is fixed through the loose spring-free screw after the regulation is completed.
2. The fine tuning and positioning device of a secondary scattering filter for a medical accelerator according to claim 1, wherein the mounting plate is provided with a rectangular groove, and a guide groove for mounting the transition plate is formed in the side wall of the rectangular groove.
3. The fine tuning and positioning device of a secondary scattering filter for a medical accelerator according to claim 2, wherein the pitch of the precision fine tooth spring screw is 0.4mm, and the screw head of the precision fine tooth spring screw is bisected into eight equal parts in the circumferential direction and marked, which corresponds to 45 degrees of screw rotation and 5 threads of displacement.
4. A secondary scatter filter fine tuning positioning apparatus for a medical accelerator as defined in claim 3, wherein the bottom surface of the transition plate has a concave structure.
5. The fine tuning and positioning device for a secondary scattering filter for a medical accelerator as claimed in claim 3 or 4, wherein the number of the waist-shaped holes on the transition plate is four, and the four waist-shaped holes are symmetrically distributed with the movement direction of the transition plate as a center.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222529267.2U CN219290464U (en) | 2022-09-23 | 2022-09-23 | Fine adjustment positioning device of secondary scattering filter for medical accelerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222529267.2U CN219290464U (en) | 2022-09-23 | 2022-09-23 | Fine adjustment positioning device of secondary scattering filter for medical accelerator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219290464U true CN219290464U (en) | 2023-07-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222529267.2U Active CN219290464U (en) | 2022-09-23 | 2022-09-23 | Fine adjustment positioning device of secondary scattering filter for medical accelerator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219290464U (en) |
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2022
- 2022-09-23 CN CN202222529267.2U patent/CN219290464U/en active Active
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