Z-axis swing structure of a mobile C-arm X-ray machine

Abstract

The present invention discloses a Z-axis swing structure of a mobile C-arm X-ray machine. It includes a brake plate, a brake piece and a swing shaft; a receiving cavity is provided on the bottom surface of the brake plate, and the brake piece is located in the receiving cavity; the swing shaft sequentially penetrates through the brake plate and the brake piece, the swing shaft is movably connected to the brake plate, and the swing shaft and the brake piece are detachably fixedly connected; a first limiting hole with a radian is formed at one end of the brake piece, and a locking pin used in cooperation with the first limiting hole is installed on the brake plate above the first limiting hole; a positioning hole is formed at the other end of the brake piece, and a locking assembly that can be inserted into the positioning hole and locked is installed at the corresponding position of the brake plate; the Z-axis swing structure of the mobile C-arm X-ray machine is convenient to operate, has strong equipment stability, and has a simple structure, all using mechanical parts, reducing costs.

Description

Technical Field

[0001] The present invention relates to a Z-direction swing structure of a mobile C-arm X-ray machine. Background Art

[0002] A mobile C-arm X-ray machine (also known as a mobile C-shaped arm X-ray machine) refers to an X-ray imaging device with a C-shaped frame, which is used for real-time dynamic imaging during surgery. The C-arm has advantages such as low radiation dose, low infection risk, small floor area, and easy mobility, and is now widely used in departments such as orthopedics, surgery, and gynecology in hospitals. The main uses of the C-arm include orthopedic nail insertion, bone setting, reduction; surgical implantation of a pacemaker, removal of foreign bodies in the body, partial angiography, partial interventional surgery; and cooperation with an ozone machine for pain treatment, small needle knife treatment, and gynecological fallopian tube guiding surgery.

[0003] The popularity rate of this type of product in hospitals is very high, and basically all secondary hospitals are equipped with it. There are also many domestic manufacturers. For example, there are quite a few in Beijing, Nanjing, and Shanghai. However, the quality and configuration vary. With the continuous deepening of the medical reform situation in China, the demand is increasing day by day, and it is continuously moving towards the most basic medical institutions and will be gradually popularized in the next 5-10 years.

[0004] During the operation, the mobile C-arm X-ray machine adjusts the position of the C-arm electrically and manually to ensure that the lesion point of the patient coincides with the focus of the C-arm during the operation, so as to obtain accurate imaging of the lesion. Among them, the Z-direction (i.e., the horizontal direction) swing of the C-arm requires a function of temporary fixation and ensure accurate and reliable restoration to the original standard position.

[0005] At present, for a Z-direction swing structure of a mobile C-arm X-ray machine in a mobile C-arm X-ray machine, most of them adopt a method of connecting and cooperating with each other by a hoop, an adjusting bolt and a rotating shaft to achieve the purpose of hoop locking - rotating shaft fixing, hoop loosening - rotating shaft rotating; that is, by rotating the adjusting bolt, the hoop is loosened or tightened, the hoop is rotated when it is loose, and the hoop is braked when it is tightened. This structure is relatively complex, and the hoop is easy to loosen, and the installation process requirements are relatively high; in addition, after a Z-direction swing structure of a mobile C-arm X-ray machine operates for a period of time, the hoop is loosened and tightened repeatedly, and the accuracy of restoring to the initial position will be reduced. The stability, accuracy and reliability of a Z-direction swing structure of a mobile C-arm X-ray machine will have a greater impact on the lesion imaging of the mobile C-arm X-ray machine.

[0006] Although the mobile C-arm X-ray machines produced by each manufacturer have their own functional structure characteristics, a Z-direction swing structure of a mobile C-arm X-ray machine needs to achieve the following functions:

[0007] 1. It can swing within the range of ±12° horizontally, thereby controlling the rotation of the horizontal slide structure within the plane range of ±12°.

[0008] 2. It can stably stop at any adjacent position within the range of ±12° horizontally.

[0009] 3. It can accurately return to the initial state, that is, the position where the rotation angle is 0°.

[0010] Regarding the third item above, after the Z-direction swing structure of a mobile C-arm X-ray machine returns to the initial state multiple times, cumulative errors may occur. The cumulative errors cause the horizontal slide rail fixedly connected thereto to be deflected, thereby reducing the overall accuracy of the mobile C-arm X-ray machine and ultimately affecting the accurate imaging of the patient's lesion site.

[0011] Even if some manufacturers can achieve the above functions, their structural designs often require relatively high production costs. Summary of the Invention

[0012] In view of the above problems, the object of the present invention is to provide a Z-direction swing structure of a mobile C-arm X-ray machine that is convenient to operate, has strong equipment stability, and has a simple structure, all using mechanical parts, thereby reducing costs.

[0013] The technical solution for realizing the present invention is as follows

[0014] A Z-direction swing structure of a mobile C-arm X-ray machine includes a brake plate, a brake pad, and a swing shaft; a receiving cavity is provided on the bottom surface of the brake plate, and the brake pad is located in the receiving cavity; the swing shaft sequentially penetrates the brake plate and the brake pad, the swing shaft is movably connected to the brake plate, and the connection between the swing shaft and the brake pad is detachably fixed; a first limiting hole with a radian is provided at one end of the brake pad, and a locking pin for cooperating with the first limiting hole is installed on the brake plate above the first limiting hole; a positioning hole is provided at the other end of the brake pad, and a locking component that can be inserted into the positioning hole and locked is installed at the corresponding position of the brake plate.

[0015] The first limiting hole is an oblong hole; the locking component is a knob plunger.

[0016] The receiving cavity is composed of two left and right fan-shaped cavities and a central circular cavity to form a bow shape, and the edge contours of both ends of the brake pad are fan-shaped; the radian of the fan shape is consistent with the radian of the corresponding fan-shaped cavity.

[0017] The included angle of the first limiting hole is 24°.

[0018] A swing flange sleeve is sleeved outside the swing shaft below the brake pad, and the step on the top surface of the swing flange sleeve is connected to the brake plate through a positioning pin.

[0019] A positioning T-shaped plate is installed between the swing flange sleeve and the brake pad, and a locking nut for cooperating with the locking pin is provided on the positioning T-shaped plate.

[0020] A spring washer is also sleeved on the locking nut below the positioning T-shaped plate.

[0021] Second limiting holes are formed on the outer surface of the swing flange sleeve, and positioning pins are arranged at corresponding hole positions of the swing shaft and the second limiting holes.

[0022] The included angle of the second limiting holes is 24.2°.

[0023] A knob plunger seat for installing the knob plunger is provided on the brake plate outside the knob plunger.

[0024] The above technical scheme is adopted: a Z-direction swing structure of a mobile C-arm X-ray machine invented by itself is adopted, and it has good effects when rotating within ±12°, temporarily fixing in position and restoring to the original position. The operation is simple, and it can work stably and reliably under a certain load. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a three-dimensional structure schematic diagram of the present invention;

[0026] Figure 2 It is a three-dimensional structure schematic diagram of the swing flange sleeve of the present invention;

[0027] Figure 3 It is a bottom view structure schematic diagram of the brake plate of the present invention;

[0028] Figure 4 It is an A-A sectional view schematic diagram of the present invention;

[0029] Figure 5 It is a B-B sectional view schematic diagram of the present invention;

[0030] Figure 6 It is a three-dimensional structure schematic diagram of the present invention;

[0031] Figure 7 It is a structure schematic diagram of the present invention when the brake pad is at the limit position (rotated 12°);

[0032] Figure 8 It is a sectional structure schematic diagram of the knob plunger of the present invention;

[0033] Figure 9 It is a three-dimensional structure schematic diagram of the positioning T-shaped plate of the present invention;

[0034] Figure 10 It is a three-dimensional structure schematic diagram of the locking nut of the present invention;

[0035] Figure 11Schematic diagram of the first limiting hole structure of the present invention;

[0036] Figure 12 Schematic diagram of the second limiting hole structure of the present invention;

[0037] In the attached drawings, 1 is a brake plate, 2 is a brake pad, 3 is a swing shaft, 4 is a receiving cavity, 5 is a first limiting hole, 6 is a locking pin, 7 is a positioning hole, 8 is a locking assembly, 9 is a positioning T-shaped plate, 10 is a knob plunger, 11 is a thrust ball bearing, 12 is a first deep groove ball bearing, 13 is a second deep groove ball bearing, 14 is a plane, 15 is a lifting column, 16 is a horizontal sliding structure;

[0038] 2.1 is an edge profile, 2.2 is a swing flange sleeve, 2.3 is a positioning pin;

[0039] 4.1 is a fan-shaped cavity;

[0040] 9.1 is a locking nut, 9.2 is a spring washer;

[0041] 10.1 is a knob plunger seat;

[0042] 2.21 is a second limiting hole, 2.22 is a positioning pin. Detailed implementation manner

[0043] See Figures 1 - 12The structural schematic diagram of the present application is shown. A Z-direction swing structure of a mobile C-arm X-ray machine includes a brake plate 1, a brake pad 2, and a swing shaft 3. The upper end of the swing shaft is fixed to a horizontal sliding structure 16, and the brake plate is fixed to a lifting column 15. The Z-direction swing structure can move with the vertical movement of the lifting column; a receiving cavity 4 is provided on the bottom surface of the brake plate, the brake pad is located in the receiving cavity, and the brake pad can make a z-direction (horizontal direction) rotational movement in the receiving cavity; the swing shaft sequentially penetrates through the brake plate and the brake pad, the swing shaft is movably connected to the brake plate, and the brake plate is sleeved on the swing shaft from top to bottom; the connection between the swing shaft and the brake pad is detachable. The middle part of the brake pad is an incomplete round hole with two straight edges, and this hole tightly fits the swing shaft and is connected and fixed to the swing shaft flange by an internal hexagonal countersunk head screw. The brake pad can rotate together with the swing shaft; a first limiting hole 5 with a radian is provided at one end of the brake pad, and a locking pin 6 that cooperates with the first limiting hole is installed on the brake plate above the first limiting hole. The flange surface of the locking pin contacts the upper surface of the brake plate, and the part passing through the brake plate is a cylindrical surface, so the locking pin can rotate; there is a 0.25 mm gap between the surfaces of the brake pad and the brake plate. The brake pad is provided with a first limiting hole, and the first limiting hole is an arc-shaped waist hole. The angle a of the arc-shaped waist hole is 24°. The locking pin passes through the hole. The lower end of the locking pin engages with a locking nut (when the brake pad rotates to the limit position, since both ends of the arc-shaped waist hole are semi-circles with a diameter of 12 mm, and the diameter of the cylindrical part of the locking pin penetrating into the arc-shaped waist hole is also 12 mm, it can be ensured that they are tightly fitted at the limit position. The included angle formed by the connection lines between the centers of the semi-circles at both ends of the arc-shaped waist hole of the brake pad and the rotation center of the swing structure is 24°. As shown below Figure 11 shown.). This structure limits the rotation range of the brake pad with the swing shaft to ±12°. A positioning hole 7 is provided at the other end of the brake pad, and a locking component 8 that cooperates with the positioning hole is installed at the corresponding position of the brake plate. The locking component uses a metal body knob plunger 10. Structures such as a standard metal body knob plunger and a locking pin are used. When the swing shaft is manually rotated to the 0° position, the knob plunger can automatically and accurately position; the stud part of the standard metal body knob plunger passes through the brake plate, and there is a retractable pin column inside. By pulling out or lowering the black knob, the pin column can enter and exit the corresponding positioning hole (the positioning hole is a round hole) of the brake pad; if the knob of the standard metal body knob plunger is lowered and the swing shaft is rotated to the initial position (the rotation amplitude is 0°), the pin column of the standard metal body knob plunger will automatically snap into the positioning hole on the brake pad due to the elastic force of the internal spring. At this time, the brake pad and the swing shaft are locked. Since the position of the standard metal body knob plunger remains unchanged all the time, it can ensure that the swing shaft accurately returns to the initial position.

[0044] A swing flange sleeve 2.2 is sleeved outside the swing shaft below the brake pad. The top of the Z-direction swing structure is fixed under the horizontal sliding structure, and the two can rotate freely within a range of ±12° horizontally; the steps on the top surface of the swing flange sleeve are assembled and positioned with the brake plate by installing two orientation pins 2.3.

[0045] A positioning T-shaped plate 9 is installed between the swing flange sleeve and the brake pad. The positioning T-shaped plate is fixed to the brake plate by socket head cap screws; a locking nut for cooperating with a locking pin is provided on the positioning T-shaped plate. The locking pin passes through the brake plate and the brake pad in sequence and meshes with the locking nut; the outer surface of the locking nut is an incomplete cylindrical surface with two planes and is sleeved in the positioning T-shaped plate with an opening of the same contour. This structure makes the locking nut unable to rotate and can only move linearly up and down in the opening of the positioning T-shaped plate. If the locking pin and the locking nut are tightened, the Z-direction swing structure of a mobile C-arm X-ray machine can stably stop at any temporary position within a range of ±12°. Therefore, during the operation, the Z-direction swing structure of a mobile C-arm X-ray machine rotates horizontally manually and can stably stop at any temporary position, ensuring that the penetration position of the X-ray will not shift due to accidental collision; after the operation, the Z-direction swing structure of a mobile C-arm X-ray machine can be accurately restored to the initial position (i.e., the 0° position).

[0046] A spring washer 9.2 is also sleeved on the locking nut 9.1 below the positioning T-shaped plate. The spring washer is sleeved on the locking nut, and the locking nut is inserted into the hole position of the positioning T-shaped plate. The locking pin passes through the brake plate and the brake pad from top to bottom and meshes with the locking nut until the spring washer is in a critical state of compression; the spring washer is installed between the locking nut and the positioning T-shaped plate, and the outer tooth part of the spring washer contacts the positioning T-shaped plate. The spring washer has elasticity when compressed. When in the compressed state, the locking nut will receive a downward force. Since the locking pin meshes with the locking nut, the locking pin also receives a downward force. This structure can ensure that the locking pin always contacts the upper surface of the brake plate during the screwing process and will not move upward.

[0047] A horizontal second limit hole 2.21 is provided on the outer surface of the swing flange sleeve. This second limit hole is also an oblong hole. A positioning pin 2.22 is provided in the hole position corresponding to the oblong hole of the swing shaft. The corresponding angle b of the oblong hole is 24.2°. The positioning pin passes through the oblong hole. The positioning pin has a thread, and the threaded part meshes with the corresponding hole position of the swing shaft. When the swing shaft rotates, the positioning pin rotates together, and the rotation range is limited within 24.2°. The purpose of designing this angle is to play an auxiliary protection role in the limit effect of the brake pad. This angle is 0.2° larger than 24° to prevent the machining or assembly error from affecting the limit effect of the brake pad. Therefore, this structure limits the rotation angle of the swing shaft to 24° (the maximum does not exceed 24.2°), that is, ±12° (the maximum does not exceed ±12.1°). (Since the two ends of the horizontal oblong hole of the Z-direction swing flange sleeve are semi-circles with a diameter of 12 mm, and the diameter of the cylindrical part of the positioning pin inserted into the oblong hole is also 12 mm, it can be ensured that the positioning pin can rotate with the swing shaft. The included angle formed by the connection line between the centers of the semi-circles at both ends of the oblong hole and the rotation center of the swing structure is 24.2°. As Figure 12 shown.)

[0048] A knob plunger seat 10.1 for installing the knob plunger is provided on the brake plate outside the metal body knob plunger. The knob plunger seat is connected to the brake plate and fixed by cross recessed head screws. The standard metal body knob plunger is installed on the knob plunger seat.

[0049] A first deep groove ball bearing 12, a thrust ball bearing 11, and a second deep groove ball bearing 13 are sequentially installed in the swing flange sleeve from top to bottom. The first deep groove ball bearing is installed between the swing shaft and the top end of the swing flange sleeve. The thrust ball bearing is installed between the bottom step of the swing shaft and the bottom step of the swing flange sleeve. The second deep groove ball bearing is installed between the swing shaft and the bottom end of the swing flange sleeve. The first deep groove ball bearing, the thrust ball bearing, and the second deep groove ball bearing are installed on the inner wall of the flange sleeve cavity from top to bottom, and the three bearings are interference-fitted with the swing shaft.

[0050] The accommodating cavity is composed of two left and right fan-shaped cavities 4.1 and a central circular cavity to form a bow shape (as Figure 7 shown). The edge contours 2.1 at both ends of the brake pad are fan-shaped. The radian of this fan shape is consistent with the radian of the corresponding fan-shaped cavity, and the centers of the circles coincide. The brake pad rotates ±12° in the cavity of the brake plate. It is required that the volume of the brake plate be as small as possible (reduce the load, save costs, and reduce the installation difficulty). And since both ends of the brake plate are exposed on the outside, the fan-shaped structure can make the shape more beautiful. In summary, a fan-shaped structure with the same radian is adopted.

[0051] Next, the installation method of the present invention will be described:

[0052] During installation, first connect the knob plunger seat 10.1 with the brake plate 1 and fix them with cross recessed countersunk head screws, and then install the standard metal body knob plunger 10 on the knob plunger seat 10.1. At the same time, put the brake pad 2 on the swing shaft 3 and connect it with the flange edge of the swing shaft, and fix it with socket head cap screws.

[0053] Then put the brake plate 1 on the swing shaft 3 from top to bottom, connect the positioning T-shaped plate 9 with the brake plate and fix it with socket head cap screws. Then put the return spring washer 9.2 on the lock nut 9.1, pass the lock nut through the hole of the positioning T-shaped plate 9, and pass the lock pin 6 through the brake plate and the brake pad from top to bottom and engage it with the lock nut 9.1 until the return spring washer is in the critical state of compression.

[0054] Install the thrust ball bearing 11, the first deep groove ball bearing 12 and the second deep groove ball bearing 13 inside the Z-direction swing flange sleeve 2.2, and then install two alignment pins into the corresponding holes on the upper flange edge of the Z-direction swing flange sleeve.

[0055] Then pass the swing shaft 3 through the Z-direction swing flange sleeve from top to bottom, and make the two corresponding holes of the brake plate engage with the alignment pins. The alignment pins play a role in installation positioning. Connect the brake plate with the Z-direction swing flange sleeve and fix it with four socket head cap screws. Finally, pass the positioning pin through the waist hole of the Z-direction swing flange sleeve and screw it into the threaded hole of the swing shaft.

[0056] Next, describe how the present invention swings within the range of ±12° horizontally, and then controls the horizontal slide structure to freely rotate within the horizontal range of ±12°: when the knob of the standard metal body knob plunger is lowered, the brake pad is locked and fixed, and the swing shaft is in a locked state; when the knob of the standard metal body knob plunger is lifted, the swing shaft can be rotated by an external force, and the brake pad rotates accordingly. Since the lock pin passes through the arc waist hole of the brake pad, when the rotation amplitude reaches ±12°, the brake pad reaches the limit position, and at the same time, the positioning pin installed at the lower end of the swing shaft also reaches the limit position. Therefore, both the lock pin and the positioning pin ensure that the horizontal swing angle range is ±12°.

[0057] The following describes how the present invention stably stops at any adjacent position within the horizontal range of ±12° (the stopping process is: manually adjust to the required angle and then manually tighten the locking pin): A spring washer is installed on the lower flange of the locking nut. When the spring washer is compressed, it has elastic force. In the compressed state, the locking nut will receive a downward force. Since the locking pin meshes with the locking nut, the locking pin also receives a downward force. The outer surface of the locking nut is an incomplete cylindrical surface with two planes 14, which is sleeved in the positioning T-shaped plate with the same cross-sectional shape and size opening. This structure makes the locking nut unable to rotate and can only move linearly up and down in the opening of the positioning T-shaped plate; while the outer surface of the locking pin is a cylindrical surface, so it can freely rotate in the corresponding round hole of the brake plate.

[0058] When the knob of the standard metal body knob plunger is lifted and the swing shaft rotates to a certain position and needs to be fixed at this adjacent position, the locking pin can be rotated clockwise by 45°. The locking nut meshing with the locking pin will rise accordingly, the spring washer is compressed, and the locking nut lifts one end of the brake pad by 0.25 mm, so that the upper surface of the brake pad fits with the lower surface of the brake plate. Then, static friction resistance is generated between the brake pad and the brake plate, and the rotation of the brake pad and the swing shaft is restricted, achieving the adjacent position fixation of the Z-direction swing structure of a mobile C-arm X-ray machine; at this time, if the locking pin is rotated counterclockwise, under the action of thread meshing, the locking nut moves downward. During this process, due to the elastic force of the spring washer itself, the locking pin and the locking nut receive downward forces, and the locking nut and the positioning T-shaped plate will not be stuck due to friction, enabling the locking nut to smoothly return to the lowest position. At this time, the spring washer is no longer compressed, and the brake pad naturally disengages from the brake plate downward, and the adjacent position fixation state of the Z-direction swing structure of a mobile C-arm X-ray machine is thus released.

[0059] The following describes how the present invention accurately returns to the initial state, that is, the position where the horizontal rotation angle is 0°: If the knob of the standard metal body knob plunger is lowered and the swing shaft is rotated to the initial position (the rotation amplitude is 0°), the pin of the standard metal body knob plunger will automatically and quickly snap into the small round hole on the brake pad due to the internal elastic force. At this time, the brake pad and the swing shaft are locked again. Since the position of the standard metal body knob plunger remains unchanged all the time, the swing shaft can be ensured to accurately return to the initial position.

Claims

1. Z-axis swing structure of a mobile C-arm X-ray machine, characterized in that, It includes a brake plate, a brake pad and a swing shaft; a receiving cavity is provided on the bottom surface of the brake plate, and the brake pad is located in the receiving cavity; the swing shaft sequentially penetrates through the brake plate and the brake pad, the swing shaft is movably connected to the brake plate, and the connection between the swing shaft and the brake pad is a detachable fixed connection; a first limiting hole with a radian is formed at one end of the brake pad, and a locking pin used in cooperation with the first limiting hole is installed on the brake plate above the first limiting hole; a positioning hole is formed at the other end of the brake pad, and a locking component that can be inserted into the positioning hole and locked is installed at the position corresponding to the positioning hole on the brake plate; a swing flange sleeve is sleeved outside the swing shaft below the brake pad, and the step on the top surface of the swing flange sleeve is connected to the brake plate through an orientation pin; a positioning T-shaped plate is installed between the swing flange sleeve and the brake pad, and a locking nut used in cooperation with the locking pin is provided on the positioning T-shaped plate; a spring washer is also sleeved on the locking nut below the positioning T-shaped plate; a second limiting hole is formed on the outer surface of the swing flange sleeve, and a positioning pin is provided in the corresponding hole position of the swing shaft and the second limiting hole.

2. The Z-direction swing structure of a mobile C-arm X-ray machine according to claim 1, characterized in that, The first limiting hole is an oblong hole; the locking component is a knob plunger.

3. The Z-axis swing structure of a mobile C-arm X-ray machine according to claim 1, characterized in that, The receiving cavity is composed of two left and right fan-shaped cavities and a central circular cavity to form a bow shape, and the edge contours at both ends of the brake pad are fan-shaped; the radian of the fan shape is consistent with the radian of the corresponding fan-shaped cavity.

4. The Z-axis swing structure of a mobile C-arm X-ray machine according to claim 1, characterized in that, The included angle of the first limiting hole is 24°.

5. The Z-direction swing structure of a mobile C-arm X-ray machine according to claim 1, characterized in that, The included angle of the second limiting hole is 24.2°.

6. The Z-axis swing structure of a mobile C-arm X-ray machine according to claim 2, characterized in that, A knob plunger seat for installing the knob plunger is provided on the brake plate outside the knob plunger.

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