Magnetic resonance multi-angle scanning auxiliary positioning device

Abstract

The invention relates to a magnetic resonance multi-angle scanning auxiliary positioning device, belongs to the technical field of magnetic resonance examination auxiliary equipment, and solves one of the problems that in the prior art, left and right ankles are not universally turned inwards and outwards, the inwards and outwards turning angles are not accurate, the angle adjusting process is prone to being blocked, the operation process is tedious, or the adaptability is poor. The magnetic resonance multi-angle scanning auxiliary positioning device comprises a foot supporting part, a leg supporting part and an angle adjusting mechanism. The leg supporting part is a basic bearing part and is used for supporting legs of a patient; the angle adjusting mechanism is connected with the bottom of the leg supporting part, the foot supporting part is movably connected with the angle adjusting mechanism, and the angle adjusting mechanism is used for adjusting the angle of varus and valgus of the ankle. According to the device, inward and outward turning adaptation of the left and right ankles is achieved, the inward and outward turning angle is accurate, fixation is firm, the angle adjusting process is stable, the operation process is simple and convenient, and adaptability is good.

Description

Technical Field

[0001] This invention relates to the field of magnetic resonance imaging (MRI) auxiliary equipment technology, and in particular to an MRI multi-angle scanning auxiliary positioning device. Background Technology

[0002] In clinical settings such as foot and ankle injury diagnosis, ligament repair follow-up, and bone metabolic disease detection, magnetic resonance imaging (MRI) is a core tool for assessing the condition. Precise positioning and stable fixation of the foot and ankle directly determine the clarity of the scanned images, the accuracy of data registration, and the reliability of image comparisons during multiple follow-up examinations. The anatomical structure of the foot and ankle is complex, containing multiple joints, ligaments, and small bones. It is also prone to scanning artifacts due to involuntary patient movement and incorrect positioning. Especially in scenarios involving prolonged examinations (such as MRI, which typically takes tens of minutes) or when pain-stricken patients are unable to maintain their position voluntarily, the stability and ease of positioning are paramount.

[0003] Existing devices are mostly dedicated fitting mechanisms for the left and right ankles, resulting in strong fixation stability on one side of the ankle but easy loosening on the other, making it impossible to simultaneously accommodate the multi-angle scanning needs of left and right ankle rotation. Some positioning devices rely on the friction of wing nuts or ratchet-ratchet locking when adjusting the angle, without quantitative scale markings. When patients are followed up, the positioning angle of the first scan cannot be reproduced, resulting in a lack of consistency between the two images and affecting the diagnostic accuracy during the injury recovery period. Positioning requires multiple steps such as "unlocking the locking mechanism → adjusting the angle → locking → clamping the leg → fixing with straps", which is cumbersome and prolongs the overall examination cycle, especially when examining a large number of patients. In hospitals or departments with high patient traffic, this can easily lead to congestion in examination queues. Furthermore, the complex procedures require a high level of proficiency from medical staff, and novices are prone to issues such as angle adjustment errors and insecure locking, further impacting examination progress and image quality. Insufficient leg fixation stability, with existing devices exhibiting uneven fixation force, and the straps easily loosening due to slight patient limb movements during scanning, leading to leg displacement and indirectly causing foot and ankle positioning deviations, affecting scanning stability. Poor motion stability during angle adjustment, with some devices lacking effective guiding mechanisms, can cause support components to shift or jam when adjusting ankle inversion and eversion angles, resulting in uneven force on the foot and ankle, affecting positioning accuracy and potentially increasing patient discomfort. Summary of the Invention

[0004] Based on the above analysis, the present invention aims to provide a magnetic resonance multi-angle scanning auxiliary positioning device to solve one of the problems of existing devices, such as incompatibility between left and right ankle inversion and eversion, inaccurate inversion and eversion angles, easy jamming during angle adjustment, insecure fixation after angle adjustment, or cumbersome operation.

[0005] The objective of this invention is mainly achieved through the following technical solutions:

[0006] A magnetic resonance imaging (MRI) multi-angle scanning assisted positioning device includes a foot support, a leg support, and an angle adjustment mechanism; the leg support is a basic load-bearing component used to support the patient's leg; the angle adjustment mechanism is connected to the bottom of the leg support, and the foot support is movably connected to the angle adjustment mechanism, which is used to adjust the inversion and eversion angles of the foot and ankle.

[0007] Furthermore, the foot support includes a movable baffle and a partition; the partition is fixedly connected to the leg support, the movable baffle is used to place and press down on the patient's foot, and the partition is used to limit the movement of the movable baffle.

[0008] Furthermore, a guiding mechanism is also provided, which includes a guide groove and a guide post, and the inner arc surface of the guide groove is adapted to the outer wall of the guide post.

[0009] Furthermore, the guiding mechanism also includes a support block; the support block is fixedly connected to the leg support portion, and the support block has an arc-shaped groove, which is used to accommodate the guide post and position the guide post.

[0010] Furthermore, the leg support includes a support plate and elastic straps; the support plate is an arc-shaped support plate, and the elastic straps are disposed on both sides of the support plate and are used to achieve stable restraint on the patient's lower leg.

[0011] Furthermore, the angle adjustment mechanism adjusts the inversion and eversion angles of the ankle from 0° to 60°.

[0012] A foot and ankle magnetic resonance multi-angle scanning examination bed includes the aforementioned magnetic resonance multi-angle scanning auxiliary positioning device, as well as a bed body and a double slide rail linkage mechanism, wherein the double slide rail linkage mechanism is fixedly installed at one end of the bed body; the positioning device is fixedly installed on the double slide rail linkage mechanism.

[0013] Furthermore, the dual-slide rail linkage mechanism includes a first moving mechanism and a second moving mechanism; the first moving mechanism drives the positioning device to move along the width direction of the bed; the second moving mechanism drives the positioning device to move along the length direction of the bed.

[0014] Furthermore, the first and second moving mechanisms are linked mechanisms to coordinate the adjustment of the position of the positioning device on the bed plane.

[0015] Furthermore, the guide groove is fixedly connected to the bottom of the foot support, and the guide groove is sleeved on the outside of the guide post and can slide along the guide post to make the angle adjustment mechanism stable for adjustment.

[0016] Furthermore, the angle adjustment mechanism includes a movable screw and a fixed sleeve; the fixed sleeve is fixedly connected to the bottom of the foot support, and the fixed sleeve has an internal thread that matches the movable screw. The fixed sleeve is threadedly engaged with the movable screw, and the rotational movement of the movable screw drives the fixed sleeve to move horizontally along the axis of the movable screw, thereby realizing the inversion or eversion of the ankle.

[0017] Furthermore, it also includes an automatic clamping unit, which includes a clamping arm, a spring, and a rotating shaft. One end of the clamping arm is hinged to the support plate via the rotating shaft, and the other end of the clamping arm is a free clamping end. One end of the spring is connected to the clamping arm, and the other end of the spring is fixedly connected to the side wall of the support plate. The clamping arm is rotated around the rotating shaft by the restoring force of the spring to clamp and fix the patient's leg.

[0018] Furthermore, the automatic clamping part also includes a positioning post, which is coaxially arranged with the spring. The positioning post is fixed to the support plate, and the spring is sleeved on the outside of the positioning post. The positioning post constrains the radial deformation of the spring.

[0019] Furthermore, the first moving mechanism includes a first base, a driving screw and a driven screw arranged parallel to each other within the first base, and a synchronous transmission belt; the axial directions of the driving screw and the driven screw are parallel to the width direction of the bed, and the two are synchronously linked through the synchronous transmission belt; the second moving mechanism includes a second base, the second base being threadedly engaged with the driving screw and the driven screw; wherein, rotating a first adjusting knob fixed to one end of the driving screw can drive the second base and the second moving mechanism and the positioning device mounted thereon to move as a whole along the width direction of the bed.

[0020] Furthermore, the second moving mechanism also includes a slide, an adjusting screw, a drive gear, an operating screw, and a screw nut; the adjusting screw is installed inside the second base, and the axis of the adjusting screw is parallel to the length direction of the bed; the slide is threadedly engaged with the adjusting screw, and the positioning device is fixed to the top of the slide; the operating screw is arranged parallel to the driving screw, and both ends of the operating screw are connected to the first base; the screw nut is sleeved on the operating screw and is circumferentially fixed to the first base through a keyway; the outer side of the screw nut is provided with a toothed ring, which meshes with the drive gear fixed to one end of the adjusting screw; wherein, rotating the operating screw can drive the toothed ring of the screw nut to rotate, thereby driving the adjusting screw to rotate through the drive gear, and finally driving the slide and the positioning device to move along the length direction of the bed.

[0021] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects: 1. The present invention sets the leg support part as the basic load-bearing component of the entire positioning device to stably support the patient's lower leg; the angle adjustment mechanism is connected to the bottom of the leg support part, and the foot support part is connected to the angle adjustment mechanism. The angle adjustment mechanism drives the foot support part to move, thereby adjusting the inversion and eversion angles of the patient's foot and ankle. It is applicable to both left and right feet.

[0022] 2. This invention uses a fixed sleeve to drive a movable screw to translate along its own axis, while the foot support moves synchronously. The guide groove moves with the foot support and is fitted on the outside of the guide post, sliding smoothly along the axis of the guide post. Through the constraint of the guide post and the guide groove, the positioning of the support block on the guide post ensures that the pressing direction of the foot support is always perpendicular to the axis of the ankle, making the ankle bear force evenly, improving the stability and adjustment accuracy of the positioning device during angle adjustment, and reducing positioning errors caused by movement deviation.

[0023] 3. This invention allows the movable screw to rotate by rotating the adjustment knob at either end, thereby pressing the foot support towards the inward or outward side of the ankle to achieve inversion or eversion adjustment of the ankle. Once the ankle is adjusted to the target positioning angle, the self-locking characteristic of the thread between the movable screw and the fixed sleeve ensures that the fixed sleeve and foot support remain stably in the current pressing position. No additional locking mechanism is required, and no replacement of adapter parts is needed to achieve inversion / eversion adjustment of the left / right foot, simplifying the device structure and improving the reliability of ankle fixation.

[0024] 4. In this invention, the free clamping ends of the clamping arms are driven by springs to move towards the center of the support plate, forming an initial clamping gap between the free clamping ends of the clamping arms that is adapted to the width of a normal calf. When the patient's calf is placed on the support plate, the two sides of the calf exert an outward squeezing force on the free clamping ends of the clamping arms. The spring is compressed and generates an adaptive restoring force, which drives the clamping arms to rotate around the rotation axis, so that the free clamping ends of the clamping arms fit tightly against the two sides of the calf, thereby achieving automatic clamping and fixing of the calf.

[0025] 5. This invention, by setting a double sliding rail linkage mechanism in the bed, realizes the displacement of the positioning device along the width and length of the bed to actively adapt to the position of the fixed affected limb. On the one hand, it reduces the pain and risk of secondary injury caused by patients (especially those with pain, trauma, or postoperative conditions) actively moving their feet and ankles; on the other hand, combined with the symmetrical design of the positioning device itself, this examination bed can seamlessly switch between left and right foot examination scenarios with just simple left and right movements, without the need for replacement, disassembly, or reassembly of other parts, thus improving examination efficiency and equipment utilization.

[0026] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the specification or be learned by practicing the invention. The objectives and other advantages of this invention can be realized and obtained from the content specifically pointed out in the text and accompanying drawings. Attached Figure Description

[0027] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0028] Figure 1 This is a schematic diagram of the overall structure of the magnetic resonance multi-angle scanning assisted positioning device in Embodiment 1; Figure 2 This is a schematic diagram of the angle adjustment mechanism of the magnetic resonance multi-angle scanning auxiliary positioning device in Embodiment 1; Figure 3 This is a schematic diagram (a) of the angle adjustment mechanism and guide mechanism of the magnetic resonance multi-angle scanning auxiliary positioning device in Embodiment 1. Figure 4 This is a schematic diagram (II) of the angle adjustment mechanism and guide mechanism of the magnetic resonance multi-angle scanning auxiliary positioning device in Embodiment 1. Figure 5 This is a schematic diagram of the overall structure of the magnetic resonance multi-angle scanning assisted positioning device in Embodiment 2; Figure 6 This is a schematic diagram of the automatic clamping part structure of the magnetic resonance multi-angle scanning assisted positioning device in Embodiment 2; Figure 7 This is a schematic diagram of the overall structure of the foot and ankle magnetic resonance multi-angle scanning examination bed in Embodiment 4; Figure 8 This is a schematic diagram of the dual-slide rail linkage mechanism of the foot and ankle magnetic resonance multi-angle scanning examination table in Embodiment 4.

[0029] Figure label: 1-Foot support; 11-Moving baffle; 12-Baffle; 2-Leg support; 21-Bracket; 22-Strap; 3-Angle adjustment mechanism; 31-Modible screw; 32-Fixed sleeve; 4-Guiding mechanism; 41-Guiding column; 42-Guiding groove; 43-Supporting block; 5-Automatic clamping unit; 51-Clamping arm; 52-Spring; 53-Rotating shaft; 54-Positioning pin; 6-Bed body; 7-Double slide rail linkage mechanism; 71-First moving mechanism; 711-First base; 712-First adjusting knob; 713-Driving screw; 714-Driven screw; 715-Synchronous transmission belt; 72-Second moving mechanism; 721-Second base; 722-Slide table; 723-Adjusting screw; 724-Drive gear; 725-Operating screw; 726-Screw nut; 727-Second adjusting knob. Detailed Implementation

[0030] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0031] Example 1 Specific embodiments of the present invention, such as Figure 1 As shown, a magnetic resonance multi-angle scanning assisted positioning device (hereinafter referred to as "positioning device") is disclosed, including a foot support part 1, a leg support part 2, and an angle adjustment mechanism 3. The leg support part 2 serves as the basic load-bearing component of the entire positioning device and is used to stably support the patient's lower leg. The angle adjustment mechanism 3 is connected to the bottom of the leg support part 2, and the foot support part 1 is connected to the angle adjustment mechanism 3. The core function of the angle adjustment mechanism 3 is to drive the foot support part 1 to make linear displacement, thereby adjusting the inversion and eversion angles of the patient's foot and ankle.

[0032] Specifically, considering the scanning artifacts caused by patients' involuntary movements and incorrect positioning, especially during prolonged examinations or when patients in pain cannot maintain their position independently, such as... Figure 1 As shown, in this embodiment, the foot support part 1 is provided with a movable baffle 11, which is vertically fixed to one end of the top of the foot support part 1. The movable baffle 11 is used to conform to the ankle. A partition 12 is vertically fixed to the side of the foot support part 1, and the partition 12 is fixedly connected to the end of the leg support part 2. The leg support part 2 is provided with a support plate 21 and an elastic strap 22, wherein, as shown... Figure 2As shown, the support plate 21 adopts an arc-shaped structure adapted to the contour of the posterior side of the human lower leg. A layer of medical sponge pad (not shown in the figure) is attached to the inner wall of the support plate 21, which can improve the patient's comfort and increase the contact area with the lower leg, reducing local pressure. Two elastic straps 22 are provided, which are fixed to the left and right edges of the support plate 21 respectively. The free ends of the elastic straps 22 are provided with Velcro (not shown in the figure), which can be used to detach and fix the elastic straps 22. During operation, the patient's lower leg is placed on the arc-shaped support plate 21, and the elastic straps 22 are wrapped around the lower leg and fixed in place to achieve stable restraint of the lower leg. In turn, the fixation of the lower leg indirectly restricts the displacement of the foot and ankle, reducing scanning artifacts caused by leg shaking, involuntary displacement of the foot and ankle, etc. It is especially suitable for patients who have long-term MRI foot and ankle scans and patients with foot and ankle pain who cannot maintain their position voluntarily.

[0033] Furthermore, current positioning devices suffer from technical problems such as the incompatibility between left and right foot positioning to achieve inversion or eversion of the ankle (requiring replacement of adapter parts to achieve inversion / everversion adjustment of the left / right foot), and cumbersome operation. Figure 3 and Figure 4 As shown, the angle adjustment mechanism 3 includes a movable screw 31 and a fixed sleeve 32. The fixed sleeve 32 is fixedly connected to the bottom center of the foot support part 1 by bolts. The fixed sleeve 32 has an internal thread that matches the external thread of the movable screw 31. The fixed sleeve 32 and the movable screw 31 form a threaded transmission through thread engagement. The rotation of the movable screw 31 can drive the fixed sleeve 32 to move horizontally along the axis of the movable screw 31, thereby driving the foot support part 1, which is fixedly connected to the fixed sleeve 32, to move horizontally synchronously. Through the directional pressing action of the foot support part 1 on the inner or outer side of the ankle, the ankle joint is forced to rotate around its own axis, ultimately achieving inversion or eversion of the ankle.

[0034] Specifically, both ends of the movable screw 31 are fixedly equipped with adjustment knobs. On the one hand, medical staff can choose to drive the movable screw 31 to rotate by adjusting the knob on either side according to the position of the scanning bed and their own operating habits, without having to move back and forth around the device, thus improving the convenience and efficiency of positioning adjustment. On the other hand, regardless of whether the patient's left or right foot is placed on the foot support 1, the movable screw 31 has a symmetrical structure, with both ends of the movable screw 31 extending to the outside of the leg support 2. It can be driven from either side of the device. The movable screw 31 can be driven to rotate by rotating the adjustment knob on either end, thereby causing the foot support 1 to press against the inside or outside of the ankle. There is no need to adjust the device structure according to the scanning requirements of the left / right foot, thus achieving universal positioning for the left and right feet.

[0035] It is worth noting that after the ankle is adjusted to the target positioning angle, the self-locking characteristic of the thread between the movable screw 31 and the fixed sleeve 32 allows the fixed sleeve 32 and the foot support 1 to be stably maintained in the current pressing position without the need for an additional locking mechanism, simplifying the device structure and improving the reliability of body position fixation. After the leg support 2 is fixed to the patient's lower leg by the elastic strap 22, when the foot support 1 presses against the outside of the ankle, it forces the ankle joint to evert around its own axis. Medical staff can change the degree of pressure of the foot support 1 by controlling the rotation angle of the adjustment knob, thereby adjusting the inversion / everversion angle.

[0036] Furthermore, to facilitate the quantitative calibration by medical staff and to reproduce the placement angle of the previous scan during patient follow-up examinations for comparison of MRI images, this embodiment provides angle markings (not shown in the figure) on the axial end faces of the adjustment knobs at both ends of the movable screw 31. The angle markings are etched circumferentially with the center of the knob as the origin, with a scale range of 0°-60° and a minimum scale value of 1°. Medical staff can quickly adjust and record the inversion / eversion angle of the ankle by observing the scale indications on the knobs. It is worth noting that when the movable baffle 11 moves to the position of the partition 12, the inversion or eversion angle of the ankle is at its maximum, and the positioning device can make the inversion or eversion angle of the ankle range from 0° to 60°.

[0037] Furthermore, to reduce issues such as offset and jamming during the translation of the foot support part 1 by the angle adjustment mechanism 3, and to ensure even force distribution on the ankle, such as... Figure 3 and Figure 4 As shown, in this embodiment, the positioning device is also provided with a guide mechanism 4, which includes a guide post 41, a guide groove 42, and a support block 43. The guide groove 42 is fixedly connected to the bottom of the foot support part 1 by bolts. The guide groove 42 is annular, and the inner arc surface of the guide groove 42 is adapted to the outer wall of the guide post 41. The guide post 41 is a cylindrical structure, and the axis of the guide post 41 is parallel to the axis of the movable screw 31. The support block 43 is fixedly connected to the leg support part 2. The support block 43 has an arc-shaped groove that can accommodate the guide post 41, which can accommodate the guide post 41 and achieve stable bearing and positioning of the guide post 41. The guide post 41 is placed in the arc-shaped groove of the support block 43 to fix the guide post 41 to the leg support part 2.

[0038] It is worth noting that when the angle adjustment mechanism 3 is working, the fixed sleeve 32 drives the movable screw 31 to translate along its own axis, and at the same time, the foot support part 1 translates synchronously. At this time, the guide groove 42 moves together with the foot support part 1. The guide groove 42 is always sleeved on the outside of the guide post 41 and slides smoothly along the axis of the guide post 41. Through the cooperation and constraint of the guide post 41 and the guide groove 42, the positioning of the support block 43 on the guide post 41 can make the pressing direction of the foot support part 1 always perpendicular to the axis of the ankle, so that the ankle is evenly stressed, improving the motion stability and adjustment accuracy of the positioning device in the angle adjustment process, and reducing the positioning error caused by motion offset.

[0039] Example 2 To address the issue of poor adaptability of existing devices to calf shapes of varying widths and thicknesses, this second embodiment differs from embodiment one in that the structure of the leg support portion 2 is different, such as... Figure 5 As shown, the elastic strap 22 is replaced with the automatic clamping part 5 to achieve automatic clamping and fixation of legs in different shapes, further improving the stability of leg fixation and reducing the deviation of foot and ankle positioning caused by leg displacement during scanning.

[0040] Specifically, the automatic clamping parts 5 are symmetrically arranged on the left and right edges of the tray 21, and the automatic clamping parts 5 are fixedly connected to the tray 21, such as... Figure 6 As shown, the automatic clamping part 5 includes a clamping arm 51, a spring 52 and a rotating shaft 53. One end of the clamping arm 51 is hinged to the tray 21 through the rotating shaft 53, and the other end of the clamping arm 51 is a free clamping end. One end of the spring 52 is connected to the middle of the clamping arm 51, and the other end of the spring 52 is fixedly connected to the side wall of the tray 21.

[0041] When the lower leg is not placed, the spring 52 is in a naturally extended state. The spring 52 drives the free clamping end of the clamping arm 51 to move towards the center of the support plate 21, and an initial clamping gap adapted to the width of a normal lower leg is formed between the free clamping ends of the clamping arm 51. When the patient's lower leg is placed on the support plate 21, the two sides of the lower leg exert an outward squeezing force on the free clamping ends of the clamping arm 51. The spring 52 is compressed and generates an adaptive restoring force, which drives the clamping arm 51 to rotate around the rotation axis 53, so that the free clamping ends of the clamping arm 51 fit tightly against the two sides of the lower leg, thereby achieving automatic clamping and fixation of the lower leg.

[0042] Furthermore, considering that the spring 52 may exhibit a slight lateral deflection tendency during ankle inversion or eversion, which could lead to loosening of the clamp and angle shift, compromising ankle positioning accuracy and causing scanning artifacts, a positioning post 54 is added inside the spring 52. The positioning post 54 is coaxially arranged with the spring 52, with one end fixed to the support plate 21 and the other end extending freely. The spring 52 is sleeved on the outside of the positioning post 54, and the positioning post 54 physically constrains the radial deformation of the spring 52, allowing the spring to only extend and contract axially along the guide post axis, reducing radial torsion and lateral offset deformation.

[0043] Furthermore, a medical pad (not shown in the figure) is attached to the inner side of the free gripping end of the clamping arm 51. This medical pad can increase the friction with the lower leg, improve the gripping stability, and reduce the pressure damage caused by the clamping arm 51 directly contacting the skin of the lower leg, thus balancing the reliability of fixation and the comfort of the patient.

[0044] Example 3 To address the problems in existing technologies where the positioning device is fixed and immovable, requiring patients (especially those with foot and ankle injuries) to actively move their limbs to get into position, and the cumbersome operation, poor patient comfort, or high risk of secondary injury caused by the need to replace or reinstall components for left and right foot examinations, a specific embodiment of the present invention discloses a foot and ankle magnetic resonance multi-angle scanning examination bed (hereinafter referred to as the "examination bed"), including the magnetic resonance multi-angle scanning auxiliary positioning device (hereinafter referred to as the "positioning device") of embodiment one or embodiment two.

[0045] Specifically, such as Figure 7 As shown, the examination bed also includes a bed body 6 and a double-slide rail linkage mechanism 7; the positioning device is installed on the top of the double-slide rail linkage mechanism 7 to achieve stable constraint and angle adjustment of the patient's foot and ankle; the bed body 6 is the load-bearing structure of the entire examination bed. The bed body 6 has no metal parts, which reduces the interference of metal materials on the magnetic resonance magnetic field and ensures that the quality of the scanned images is not affected. The bed body 6 is provided with a recessed or flat installation area corresponding to the patient's foot placement area. This installation area is used to install the double-slide rail linkage mechanism 7, so that the upper surface of the double-slide rail linkage mechanism 7 transitions smoothly with the bed surface, improving the patient's limb placement comfort. The side of the bed body 6 is provided with an operation panel area for setting up the operating components of the double-slide rail linkage mechanism 7, which is convenient for medical staff to operate.

[0046] Considering that existing devices require lifting the patient's limbs and placing them into the positioning device during foot and ankle MRI scan-assisted positioning, which can easily lead to poor patient comfort or secondary injury, the dual-slide rail linkage mechanism 7 includes a first moving mechanism 71 and a second moving mechanism 72. The first moving mechanism 71 and the second moving mechanism 72 move the positioning device along the width and length of the bed 6, positioning the positioning device at the patient's foot and ankle.

[0047] Specifically, the first moving mechanism 71 includes a first base 711, a first adjusting knob 712, a driving screw 713, a driven screw 714, and a synchronous transmission belt 715. The first base 711 is a rectangular frame structure and is detachably connected to the bed 6. The driving screw 713 and the driven screw 714 are arranged parallel to each other inside the first base 711. The axial direction of the driving screw 713 and the driven screw 714 is consistent with the width direction of the bed. Both ends of the driving screw 713 and the driven screw 714 are connected to the bed via non-metallic bearings (not labeled). The first base 711 is rotatably connected by a synchronous drive belt 715, through which the driving screw 713 and the driven screw 714 rotate synchronously. The synchronous drive belt 715 is a non-metallic toothed drive belt, which is sleeved on the same end of the driving screw 713 and the driven screw 714, ensuring even force distribution when the positioning device moves. The inner side of the synchronous drive belt 715 is provided with anti-slip teeth, which mesh with the pulleys (not shown in the figure) of the driving screw 713 and the driven screw 714, reducing slippage of the synchronous drive belt 715. One end of the driving screw 713 passes through the side wall of the first base 711 and extends to the outer side of the first base 711. A first adjustment knob 712 is provided at the end of the driving screw 713.

[0048] Furthermore, the second moving mechanism 72 includes a second base 721, a slide 722, an adjusting screw 723, a drive gear 724, an operating lead screw 725, a lead screw nut 726, and a second adjusting knob 727. The second base 721 has a block-shaped structure. Two threaded holes are opened at the bottom of the second base 721. The two threaded holes are respectively engaged with the threads of the driving screw 713 and the driven screw 714. The bottom of the second base 721 slides with the inner bottom surface of the first base 711. When the first adjusting knob 712 is rotated, the driving screw 713 rotates, which drives the driven screw 714 to rotate synchronously through the synchronous transmission belt 715. The driving screw 713 and the driven screw 714 drive the second base 721 to move linearly along the axis of the driving screw 713 and the driven screw 714 through threaded engagement, thereby realizing the translation of the second base 721 and the positioning device.

[0049] Furthermore, the adjusting screw 723 is installed inside the second base 721 via a non-metallic bearing (not shown in the figure), and the axial direction of the second base 721 is consistent with the length direction of the bed 6. The slide table 722 is a flat plate structure. The top of the slide table 722 is used to fix the positioning device, and the bottom of the slide table 722 has a threaded hole. The slide table 722 and the adjusting screw 723 are threaded together. The two sides of the slide table 722 slide against the inner sidewall of the second base 721, so that the slide table 722 can move smoothly along the axial direction of the adjusting screw 723. The end of the adjusting screw 723 is provided with a drive gear 724, and the operating screw 725 is set parallel to the driving screw 713. The operating screw 725 passes through the first base 711, and the two ends of the operating screw 725 are rotatably connected to the sidewall of the first base 711 via non-metallic bearings (not shown in the figure), so that the operating screw 725 can rotate freely, but the axial position of the operating screw 725 is fixed and cannot move along its own axial direction. The operating screw 725 extends to the side operating panel area of ​​the bed body 6. A second adjustment knob 727 is provided at the end of the operating screw 725. The first adjustment knob 712 and the second adjustment knob 727 are located on the same side of the device, which is convenient for medical staff to operate.

[0050] Furthermore, the lead screw nut 726 is sleeved on the operating lead screw 725. The lead screw nut 726 is circumferentially fixed to the first base 711 through a keyway structure, that is, the lead screw nut 726 cannot rotate around the axis of the operating lead screw 725, but can move along the width direction of the bed 6 with the first base 711. A gear is provided on the outer side of the lead screw nut 726. During the movement of the second base 721, the lead screw nut 726 always maintains engagement with the drive gear 724.

[0051] To further improve the reliability of the mechanism and reduce the risk of components detaching from the track under extreme conditions, limit baffles are provided at both ends of the second base 721. These baffles are located at the final position of the slide table 722's movement path, and the inner side of the baffles forms a rigid mechanical stop for the slide table 722's forward and backward movement, reducing the risk of the slide table 722 falling off the second base 721 during operation. Similarly, limit baffles are provided on the side edges of the first base 711. These limit baffles cooperate with the protrusions or blocks on the side of the second base 721 to form the final mechanical barrier for the left and right movement of the second base 721, reducing the risk of the second base 721 detaching from the guide rail of the first base 711.

[0052] When it is necessary to adjust the position of the positioning device along the width of the bed, medical staff directly rotate the first adjustment knob 712 on the control panel. At this time, the first adjustment knob 712 drives the active screw 713 to rotate, and the active screw 713 drives the driven screw 714 to rotate synchronously and in the same direction via the synchronous transmission belt 715. Since both the active screw 713 and the driven screw 714 are threadedly engaged with the second base 721, and the second base 721 is restricted from rotation, the rotational motion of the active screw 713 and the driven screw 714 is converted into linear movement of the active screw 713 and the driven screw 714 along the width of the bed, thereby driving the second base 721 and the positioning device to translate left and right. During this process, the operating screw 725 remains stationary, and the screw nut 726 translates synchronously with the first base 711. Because the screw nut 726 is circumferentially fixed, it only translates in the width direction of the bed without rotation, and the position of the slide table 722 remains unchanged, achieving independent movement in the width direction of the bed.

[0053] When the position of the positioning device along the length of the bed needs to be adjusted, medical staff rotate the operating screw 725. Since the screw nut 726 is circumferentially fixed to the first base 711 via a keyway, it cannot rotate around the axis of the operating screw 725. The rotational motion of the operating screw 725 is converted into a rotational driving force on the screw nut 726. This driving force is transmitted through the screw nut 726 to the meshing drive gear 724, causing the drive gear 724 to rotate. The drive gear 724 drives the adjusting screw 723 to rotate synchronously. The adjusting screw 723 drives the slide 722 to move linearly along the length of the bed through threaded engagement, realizing the forward and backward translation of the positioning device. During this process, the first adjusting knob 712 is not operated, the driving screw 713 and the driven screw 714 remain stationary, the second base 721 is locked at the current position in the width direction of the bed, and only the slide 722 moves independently, achieving independent control of the bed along its length.

[0054] When it is necessary to adjust the positioning device along the length and width directions at the same time, the position of the slide table 722 and the positioning device in the plane of the bed body 6 can be achieved by operating the first adjustment knob 712 and the operating screw 725 separately or simultaneously, so as to meet the positioning needs of different patient body types and different affected ankles.

[0055] Once the MRI scan is complete, rotating the first adjustment knob 712 or the second adjustment knob 727 in the reverse direction will detach the patient's foot and ankle from the positioning device. The movable positioning device actively adapts to the stationary limb, reducing pain and the risk of secondary injury caused by the patient's (especially those experiencing pain, trauma, or post-operative complications) active movement of the foot and ankle. Furthermore, combined with the symmetrical design of the positioning device itself, the examination table can seamlessly switch between left and right foot examination scenarios with simple left and right movements, without requiring replacement, disassembly, or reassembly of other parts, thus improving examination efficiency and equipment utilization.

[0056] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A magnetic resonance multi-angle scan assisted positioning device, characterized in that, It includes foot support part (1), leg support part (2) and angle adjusting mechanism (3);The leg support part (2) is a basic load-bearing component and is used to support the patient's leg;The angle adjusting mechanism (3) is connected with the bottom of the leg support part (2), the foot support part (1) is movably connected with the angle adjusting mechanism (3), and the angle adjusting mechanism (3) is used to adjust the angle of foot ankle varus and eversion.

2. The magnetic resonance multi-angle scan assisted positioning device of claim 1, wherein, The foot support part (1) includes a movable baffle (11) and a partition (12);The partition (12) is fixedly connected with the leg support part (2), and the movable baffle (11) is used to place and press the patient's foot, and the partition (12) is used to limit the movable baffle (11).

3. The magnetic resonance multi-angle scan assist positioning device of claim 1, wherein, A guide mechanism (4) is further provided, the guide mechanism (4) includes a guide groove (42) and a guide column (41), and the inner side arc surface of the guide groove (42) is matched with the outer side wall of the guide column (41).

4. The magnetic resonance multi-angle scan assisted positioning apparatus of claim 3, wherein, The guide mechanism (4) further includes a support block (43);The support block (43) is fixedly connected with the leg support part (2), and the support block (43) is provided with an arc-shaped groove, and the arc-shaped groove is used to accommodate the guide column and position the guide column (41).

5. The magnetic resonance multi-angle scan assist positioning device of claim 1, wherein, The leg support part (2) includes a supporting plate (21) and an elastic band (22);The supporting plate (21) is an arc-shaped supporting plate, and the elastic band (22) is arranged at the two side edges of the supporting plate (21) and is used to stably constrain the patient's calf.

6. The magnetic resonance multi-angle scan assist positioning device of claim 1, wherein, The angle adjusting mechanism (3) adjusts the angle of foot ankle varus and eversion to be 0°-60°.

7. A foot and ankle magnetic resonance multi-angle scan examination bed, characterized in that, The magnetic resonance multi-angle scanning auxiliary positioning device comprises the bed body (6) and the double slide rail linkage mechanism (7), and the double slide rail linkage mechanism (7) is fixedly installed at one end of the bed body (6);The positioning device is fixedly installed on the double slide rail linkage mechanism (7).

8. The foot and ankle magnetic resonance multi-angle scan examination bed of claim 7, wherein, The double slide rail linkage mechanism (7) includes a first moving mechanism (71) and a second moving mechanism (72);The first moving mechanism (71) drives the positioning device to move along the width direction of the bed body (6);The second moving mechanism (72) drives the positioning device to move along the length direction of the bed body (6).

9. The foot and ankle magnetic resonance multi-angle scan examination bed of claim 8, wherein, The first moving mechanism (71) and the second moving mechanism (72) are linkage mechanisms, which are used to cooperatively adjust the position of the positioning device on the bed body (6) plane.

10. The magnetic resonance multi-angle scan assisted positioning apparatus of claim 3, wherein, The guide groove (42) is fixedly connected with the bottom of the foot support part (1), the guide groove (42) is sleeved outside the guide column (41) and can slide along the guide column (41) to stably adjust the angle adjusting mechanism (3).

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