A rotation mechanism for patient positioning
By combining a dual-axis rotary table and a motion actuator, the problems of structural complexity and low precision of existing treatment bed rotation mechanisms are solved, achieving efficient and precise patient positioning control and improving the effectiveness of radiotherapy.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHAANXI HUAMING PUTAI MEDICAL EQUIP CO LTD
- Filing Date
- 2025-08-26
- Publication Date
- 2026-07-28
AI Technical Summary
The existing rotating mechanism of the treatment bed has problems such as complex structure, slow response, low precision and weak vibration resistance, which leads to large positioning errors during radiotherapy and affects the treatment effect.
The combination of a dual-axis rotary table and a motion actuator converts rotary motion into precise linear motion through a lead screw and nut pair. The articulated structure of the dual-axis rotary table and the motion actuator improves response speed and adjustment freedom, and enhances vibration resistance.
It achieves precise control of position and speed, improves the response speed and adjustment flexibility of the treatment bed, reduces positioning errors, and enhances the accuracy and safety of radiotherapy.
Smart Images
Figure CN224557939U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of medical equipment, and particularly relates to a rotating mechanism for patient positioning. BACKGROUND
[0002] A treatment bed is an important component of a medical linear accelerator system, and functions to fix a patient during radiotherapy, thereby facilitating a doctor to perform radiotherapy. Radiotherapy is a method of treating a tumor primary site or metastatic site using radiation, and needs to maximize the concentration of a radiation dose to a lesion area, so as to efficiently kill tumor cells and avoid irradiation of surrounding normal tissues and organs.
[0003] When a tumor patient is subjected to radiotherapy, the body needs to be fixed to a treatment bed, and body positioning is adjusted by medical staff. The lack of flexibility in adjusting the treatment bed and the experience of the medical staff can all lead to positioning errors. At this time, radiotherapy can be performed, and part of the target region can be outside the field, and part of the surrounding normal tissues and organs can enter the field, thereby reducing the radiotherapy effect and damaging the surrounding normal tissues and organs. Therefore, a rotating mechanism needs to be provided at the bottom of the treatment bed. The patent with the publication number CN223220841U, a two-dimensional rotating drive mechanism of a treatment bed, adopts gear transmission to realize two-dimensional rotation. The backlash of the gear is difficult to eliminate, the anti-vibration interference ability is weak, the meshing friction of the gear is larger than the rolling friction of the lead screw guide rail, so the actual use is greatly affected by the environment. In addition, the structure of the two-dimensional rotating drive mechanism is complex, the response is slow, the repeated positioning is low in precision, and the actual use needs to be adjusted multiple times to reach the predetermined position. UTILITY MODEL CONTENTS
[0004] The utility model wants to solve the technical problem in the prior art, and provides a rotating mechanism for patient positioning.
[0005] To solve the above technical problems, the utility model adopts the technical scheme of a rotating mechanism for patient positioning, characterized by comprising a static platform, a double-shaft turntable installed on the static platform, two groups of power mechanisms and two groups of motion execution mechanisms, the top of the double-shaft turntable and the motion execution mechanism is connected with the bottom of a dynamic platform for installing a treatment bed, the two groups of motion execution mechanisms are symmetrically arranged on the two sides of the two groups of power mechanisms, and one group of power mechanisms drives one group of motion execution mechanisms. The power mechanism comprises a first support seat and a second support seat fixed on the static platform and used for penetrating a lead screw, a prime mover output shaft is connected with one end of the lead screw through a shaft coupling, a nut seat is threadedly connected with the lead screw, and the lead screw shaft is connected with an encoder at the tail end. The motion actuator includes a horizontal guide rail fixed on a stationary platform, a first slider slidingly engaged with the horizontal guide rail, an inclined guide rail base mounted on the first slider, the inclined guide rail fixed along the inclined surface of the inclined guide rail base, a second slider slidingly engaged with the inclined guide rail, a first hinge seat mounted on the second slider, the hinge shaft of the first hinge seat being rotatable around the X-axis; a second hinge seat connected to the shaft end of the first hinge seat, the hinge shaft of the second hinge seat being rotatable around the Y-axis, and the inclined guide rail base being connected to the side of the nut seat.
[0006] The aforementioned rotating mechanism for patient positioning is characterized in that: the dual-axis turntable includes a U-shaped structure and a turntable support for mounting the XY dual axes; both ends of the X-axis and both ends of the Y-axis of the XY dual axes are provided with rotary supports; the rotary supports at both ends of the X-axis of the XY dual axes are respectively mounted on the two top ends of the turntable support; and a third hinge seat with an H-shaped structure is mounted on the rotary supports at both ends of the Y-axis of the XY dual axes; the tops of the third hinge seat and the second hinge seat are both connected to the bottom of the moving platform for mounting the treatment bed.
[0007] The above-mentioned rotating mechanism for patient positioning is characterized in that: the inclined guide rail base is fixedly connected to the first slider, and the bottom of the first hinge seat is fixedly connected to the second slider.
[0008] The above-mentioned rotating mechanism for patient positioning is characterized in that: the nut seat is disposed on the lead screw segment between the first support seat and the second support seat, a connecting block is disposed on the side of the nut seat, and the inclined guide rail base is fixedly connected to the connecting block.
[0009] The above-mentioned rotating mechanism for patient positioning is characterized in that: the U-shaped openings on both sides of the third hinge seat of the H-shaped structure are aligned with the X-axis direction of the XY dual axis, and the width of the U-shaped opening is not less than the width of the XY dual axis. The beneficial effects of this utility model are as follows: the third hinge seat of the dual-axis turntable and the second hinge seat of the motion actuator are connected to the bottom of the moving platform used to install the treatment bed. The second slider slides in cooperation with the inclined guide rail. The inclined guide rail base of the inclined guide rail is installed on the first slider that slides in cooperation with the horizontal guide rail. The guide rail slider pair provides precise guidance and rigid support. The movement of the inclined guide rail bases of the two sets of motion actuators allows the two second hinge seats to travel to different lateral distances and reach different heights. The power mechanism uses a screw and nut pair to convert the rotational motion output by the power mechanism into precise linear motion. The nut seat drives the inclined guide rail base to move linearly, accurately controlling the position and speed. The cooperation of the dual-axis turntable, the two sets of power mechanisms and the two sets of motion actuators can improve the response speed and the efficiency of adjusting the degrees of freedom of the moving platform. The hinge structure in the dual-axis turntable and the two sets of motion actuators has strong anti-vibration interference ability and good flexibility.
[0010] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 for Figure 1 A schematic diagram of the structure of the platform is removed. Figure 3 for Figure 1 The view after rotating by an angle; Figure 4 for Figure 1 The view after rotating to another angle; Figure 5 This is a schematic diagram of the power structure of this utility model; Figure 6 This is a schematic diagram of the motion actuator of this utility model; Figure 7 This is a side view of the motion actuator of this utility model; Figure 8 This is a schematic diagram of the structure of the dual-axis rotary table of this utility model; Figure 9 This is a view of the dual-axis turntable of this utility model after it has been rotated by an angle in the Y direction; Figure 10 for Figure 9 The view after rotating by an angle in the X direction; Explanation of reference numerals in the attached figures: 1—Static platform; 2—Moving platform; 3—Power mechanism; 4—Motion actuator; 5—Dual-axis rotary table; 301—Prime mover; 302—Coupling; 303—First support seat; 304—Lead screw; 305—Nut seat; 306—Second support seat; 307—Encoder; 401—Horizontal guide rail; 402—First slider; 403—Angled guide rail; 404—Second slider; 405—First hinge seat; 406—Second hinge seat; 407—Inclined guide rail base; 501—Turntable support; 502—Slewing bearing; 503—XY dual axis; 504—Third hinge seat. Detailed Implementation
[0012] like Figures 1 to 10As shown, this utility model includes a static platform 1 and a dual-axis turntable 5, two sets of power mechanisms 3 and two sets of motion actuators 4 installed on the static platform 1. The top of the dual-axis turntable 5 and the motion actuators 4 are connected to the bottom of the moving platform 2 for installing the treatment bed. The two sets of motion actuators 4 are arranged symmetrically on both sides of the two sets of power mechanisms 3, and one set of power mechanisms drives one set of motion actuators 4. The power mechanism 3 includes a first support 303 and a second support 306, both fixed on the static platform 1 and used to pass through the lead screw 303. The output shaft of the prime mover 301 is connected to one end of the lead screw 303 through a coupling 302. The nut seat 305 is threadedly connected to the lead screw 304. An encoder 307 is connected to the end of the lead screw 304 shaft. The motion actuator 4 includes a horizontal guide rail 401 fixed on a static platform 1, a first slider 402 slidably engaged with the horizontal guide rail 401, an inclined guide rail base 407 mounted on the first slider 402, an inclined guide rail 403 fixed along the inclined surface of the inclined guide rail base 407, a second slider 404 slidably engaged with the inclined guide rail 403, a first hinge seat 405 mounted on the second slider 404, and the hinge shaft of the first hinge seat 405 rotatable around the X-axis; a second hinge seat 406 connected to the shaft end of the first hinge seat 405, and the hinge shaft of the second hinge seat 406 rotatable around the Y-axis; and the inclined guide rail base 407 connected to the side of the nut seat 305.
[0013] It should be noted that the third hinge seat 504 of the dual-axis rotary table and the second hinge seat 406 of the motion actuator are connected to the bottom of the moving platform 2 used to mount the treatment bed. The second slider 404 is slidably engaged with the inclined guide rail 403. The inclined guide rail base 407 of the inclined guide rail 403 is mounted on the first slider 402, which is slidably engaged with the horizontal guide rail 401. The guide rail slider pair provides precise guidance and rigid support. The movement of the inclined guide rail bases 407 of the two sets of motion actuators 4 causes the two second hinge seats 404 to move. 6. When the vehicle travels to different lateral distances and reaches different heights, the power mechanism 3 uses a screw and nut pair to convert the rotational motion output by the power mechanism into precise linear motion. The nut seat 305 drives the inclined guide rail base 407 to move linearly, accurately controlling the position and speed. The cooperation of the dual-axis turntable 5, the two sets of power mechanisms 3 and the two sets of motion actuators 4 can improve the response speed and the efficiency of adjusting the degrees of freedom of the moving platform 2. The hinge structure in the dual-axis turntable 5 and the two sets of motion actuators 4 has strong anti-vibration interference ability and good flexibility.
[0014] In this embodiment, the dual-axis turntable 5 includes a U-shaped structure turntable support 501 for mounting the XY dual-axis 503. Rotary supports 502 are provided at both ends of the X-axis direction and both ends of the Y-axis direction of the XY dual-axis 503. The rotary supports 502 at both ends of the X-axis direction of the XY dual-axis 503 are respectively mounted on the two top ends of the turntable support 501. A third hinge seat 504 with an H-shaped structure is mounted on the rotary supports 502 at both ends of the Y-axis direction of the XY dual-axis 503. The tops of the third hinge seat 504 and the second hinge seat 406 are both connected to the bottom of the moving platform 2 for mounting the treatment bed.
[0015] It should be noted that the two ends of the U-shaped turntable support 501 are respectively provided with arc-shaped grooves. The rotary supports 502 at both ends of the X-axis direction of the XY dual axis 503 are respectively installed in the arc-shaped grooves at both ends of the turntable support 501. In this embodiment, the U-shaped openings on both sides of the third hinge seat 504 of the H-shaped structure are aligned with the X-axis direction of the XY dual axis 503. The width of the U-shaped opening is not less than the width of the XY dual axis 503, ensuring that when the moving platform 2 is tilted on both sides along the X-axis direction, the third hinge seat 504 does not touch the XY dual axis 503.
[0016] In this embodiment, the inclined guide rail base 407 is fixedly connected to the first slider 402, and the bottom of the first hinge seat 405 is fixedly connected to the second slider 404.
[0017] In this embodiment, the nut seat 305 is disposed on the screw 303 segment between the first support seat 303 and the second support seat 306, and a connecting block is disposed on the side of the nut seat 305, and the inclined guide rail base 407 is fixedly connected to the connecting block.
[0018] When this utility model is in use, the prime movers 301 in the two sets of power mechanisms 3 work separately without needing to be synchronized. The two sets of power mechanisms 3 drive the first sliders 402 of the two sets of motion actuators 4 to travel different lengths, causing the second sliders 404 to slide to different heights on the inclined guide rail 403. The XY dual axes 503 of the dual-axis turntable 5 also rotate with the moving platform 2, accurately controlling the position and speed. The cooperation of the dual-axis turntable 5, the two sets of power mechanisms 3 and the two sets of motion actuators 4 can improve the response speed and the efficiency of adjusting the degrees of freedom of the moving platform 2. The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the present utility model. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present utility model shall still fall within the protection scope of the present utility model.
Claims
1. A rotating mechanism for patient positioning, characterized in that: It includes a static platform (1) and a dual-axis turntable (5) installed on the static platform (1), two sets of power mechanisms (3) and two sets of motion actuators (4). The top of the dual-axis turntable (5) and the motion actuators (4) are connected to the bottom of the moving platform (2) used to install the treatment bed. The two sets of motion actuators (4) are arranged symmetrically on both sides of the two sets of power mechanisms (3). One set of power mechanisms drives one set of motion actuators (4). The power mechanism (3) includes a first support seat (303) and a second support seat (306) both fixed on the static platform (1) and used for threading the lead screw (303). The output shaft of the prime mover (301) is connected to one end of the lead screw (303) through a coupling (302). The nut seat (305) is threadedly connected to the lead screw (304). An encoder (307) is connected to the end of the lead screw (304) shaft. The motion actuator (4) includes a horizontal guide rail (401) fixed on a stationary platform (1), a first slider (402) slidingly engaging with the horizontal guide rail (401), an inclined guide rail base (407) mounted on the first slider (402), an inclined guide rail (403) fixed along the inclined surface of the inclined guide rail base (407), a second slider (404) slidingly engaging with the inclined guide rail (403), a first hinge seat (405) mounted on the second slider (404), and the hinge shaft of the first hinge seat (405) being rotatable around the X-axis; a second hinge seat (406) connected to the shaft end of the first hinge seat (405), and the hinge shaft of the second hinge seat (406) being rotatable around the Y-axis; and the inclined guide rail base (407) being connected to the side of the nut seat (305).
2. A rotating mechanism for patient positioning according to claim 1, characterized in that: The dual-axis turntable (5) includes a U-shaped structure and a turntable support (501) for mounting the XY dual-axis (503). Rotary supports (502) are provided at both ends of the X-axis direction and both ends of the Y-axis direction of the XY dual-axis (503). The rotary supports (502) at both ends of the X-axis direction of the XY dual-axis (503) are respectively installed at the two top ends of the turntable support (501). A third hinge seat (504) with an H-shaped structure is installed on the rotary supports (502) at both ends of the Y-axis direction of the XY dual-axis (503). The tops of the third hinge seat (504) and the second hinge seat (406) are connected to the bottom of the moving platform (2) for mounting the treatment bed.
3. A rotating mechanism for patient positioning according to claim 1, characterized in that: The inclined guide rail base (407) is fixedly connected to the first slider (402), and the bottom of the first hinge seat (405) is fixedly connected to the second slider (404).
4. A rotating mechanism for patient positioning according to claim 1, characterized in that: The nut seat (305) is disposed on the screw section of the lead screw (303) between the first support seat (303) and the second support seat (306). A connecting block is provided on the side of the nut seat (305), and the inclined guide rail base (407) is fixedly connected to the connecting block.
5. A rotating mechanism for patient positioning according to claim 2, characterized in that: The U-shaped openings on both sides of the third hinge seat (504) of the H-shaped structure are aligned with the X-axis direction of the XY dual axis (503), and the width of the U-shaped openings is not less than the width of the XY dual axis (503).