Patient limb lifting adjusting device for interventional operation
By designing a limb lift adjustment device including limb angle adjustment, lift and end restriction mechanism, the problems of poor adjustment performance, insufficient hygiene requirements and poor comfort in the prior art are solved, and more efficient, comfortable and stable limb lift and surgical operations are achieved.
Patent Information
- Application Number
- CN202510045307.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-13
- Publication Date
- 2025-03-07
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The existing limb braces used in interventional surgery have poor regulation performance, insufficient hygiene requirements, poor comfort during the patient's limb lifting, and a separate medical staff is required to lift it, which leads to time-consuming, labor-intensive and poor stability.
A patient's limb lift adjustment device for interventional surgery is designed, including a limb angle adjustment mechanism, a limb lift mechanism and a limb end restriction mechanism. Through the cooperation of these mechanisms, flexible adjustment and stable lift of the limb are achieved, reducing the human resources of medical staff.
This device improves the adjustment performance and sanitary conditions of the limbs, enhances the comfort of the patient's limb lifting process, ensures the stable posture of the limb during the operation, facilitates disinfection and expands the operating range of the surgical operation.
Smart Images
Figure CN119564454A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of limb brace instruments, and in particular to a patient limb lifting and adjusting device for interventional surgery. Background Art
[0002] Interventional therapy is a minimally invasive treatment using modern high-tech means. Under the guidance of medical imaging equipment, special catheters, guidewires and other precision instruments are introduced into the human body to diagnose and locally treat pathological conditions in the body. Before the interventional surgery begins, the current practice is to have a medical staff member lift the patient's limb to be punctured, and lift the patient's upper or lower limbs to a certain angle, so as to facilitate the disinfection and sterilization of the puncture site on the limb; and during the operation, the patient's limb to be punctured still needs to be lifted to keep the limb in a better posture for the puncture surgery.
[0003] However, the current practice of using a single medical staff member to lift the patient's limbs is not only time-consuming and laborious, but also has poor stability. The limb braces used in interventional treatments on the market are mostly "T"-shaped or "I"-shaped braces. Although they have the ability to lift the patient's limbs, they do not have the ability to adjust the limb inclination angle left and right. In addition, the pitch angle of the bracket is fixed, and the contact area between the lifted limb and the bracket becomes smaller, which makes the limb susceptible to local compression. Therefore, those skilled in the art hereby propose a solution for a patient limb lifting and adjustment device for interventional surgery. Summary of the invention
[0004] The purpose of the present invention is to solve the defects of the limb brace used in interventional surgery proposed in the above-mentioned background technology, such as poor adjustment performance, insufficient hygiene requirements, and poor comfort during the patient's limb lifting process. A patient limb lifting and adjustment device for interventional surgery is provided. The device can provide better comfort for the operation of disinfecting the patient's limbs before surgery, and is beneficial for us to reduce the human resources of medical staff.
[0005] The above-mentioned purpose of the present invention is achieved like this: A patient limb lifting and adjustment device for interventional surgery, comprising a base, a limb angle adjustment mechanism is arranged on both left and right sides of the top surface of the base, a limb lifting mechanism is fixedly connected to the top surface of the limb angle adjustment mechanism, a limb placement bracket is hinged at the top of the limb lifting mechanism, and a limb end limiting mechanism is arranged on the front side of the upper surface of the limb placement bracket; The limb placement bracket includes an arc-shaped support plate, an arc-shaped silicone plate fixed to the upper surface of the arc-shaped support plate by adhesive, and two connecting blocks fixed to the left and right sides of the lower surface of the arc-shaped support plate, the bottom end of the connecting block is fixedly connected to a latch, and an axle pin is rotated through the interior of the latch; The limb angle adjustment mechanism includes a pad, two fixing plates fixedly connected to the front and rear sides of the upper surface of the pad, and two bearing seats fixed to the upper surface of the fixing plates, a rotating shaft is rotatably arranged inside the bearing seat, and L-shaped support plates are fixed at the front and rear ends of the rotating shaft, a semicircular slide is opened inside the L-shaped support plate, and an adjusting screw penetrating the fixing plate is arranged inside the semicircular slide; specifically, during the interventional treatment, the adjusting screw is moved along an arc inside the semicircular slide by loosening the nut on the adjusting screw until the adjusting screw moves to the specified position, and then the nut on the adjusting screw is tightened again. At this time, the two L-shaped support plates are pulled by the rotating shaft to the same angle, and the L-shaped support plate allows the limb lifting mechanism and the limb placing bracket to tilt to the left or right, so as to change the left and right angles of the limb after being placed on the upper surface of the arc support plate.
[0006] The limb lifting mechanism includes a hollow tube, a movable column inserted into the inner cavity of the hollow tube, and a socket opened in the top end face of the movable column, and a screw rod is screwed through the side wall of the hollow tube, and one end of the screw rod located in the inner cavity of the hollow tube contacts the outer ring surface of the movable column. Specifically, before the interventional surgery begins, the patient's limb is placed in the concave surface of the upper surface of the arc-shaped support plate, and the arc-shaped support plate as a whole has an arc, and the surface of the limb can be sunken in the concave surface. In addition, loosen the restriction of the screw rod on the movable column, pull the movable column out of the hollow tube, and after locking the screw rod, the arc-shaped support plate relies on the latch and the shaft pin to change its own pitch angle and raise the height of the limb.
[0007] The limb end limiting mechanism includes a servo motor fixed on the left side of the upper surface of the arc-shaped support plate, a transmission shaft connected to the output shaft of the servo motor through a coupling, a winding roller is connected to the end of the transmission shaft, an elastic band is wrapped around the outer ring of the winding roller, and a support frame is fixed to the upper surface of the arc-shaped support plate, the end of the winding roller is inserted into the interior of the support frame for rotation, and a bearing adapted to the end of the winding roller is arranged inside the support frame.
[0008] Furthermore, a rubber anti-skid pad is fixedly connected to the bottom surface of the base by an adhesive, a plurality of anti-skid grooves are arranged on the bottom surface of the rubber anti-skid pad, and the edge of the upper surface of the base is chamfered with an arc.
[0009] Furthermore, the upper surface of the arc-shaped support plate is provided with a downwardly sunken concave surface, the bottom surface of the arc-shaped silicone plate is attached to the concave surface on the upper surface of the arc-shaped support plate, and the upper surface of the arc-shaped silicone plate is covered with a disposable medical sterile cloth.
[0010] Furthermore, the plug is inserted into the inner cavity of the socket, and the plug and the left and right side walls of the socket are both provided with through holes for the shaft pin to pass through, wherein the left and right ends of the shaft pin pass through the interior of the socket.
[0011] Furthermore, there is a spacing of 1-2 cm between the bottom end surface of the connecting block and the top end surface of the movable column, so that the latch pin does not contact the top end of the movable column when rotating along the axis of the shaft pin.
[0012] Furthermore, the bottom surface of the cushion block is fixedly connected to the upper surface of the base, the fixing plate is "L" shaped, and there is a gap of 1-2 cm between the sides of the fixing plates close to each other and the front and rear end surfaces of the cushion block.
[0013] Furthermore, one end of the adjusting screw away from the fixed plate passes through the inside of the semicircular slide, a nut is sleeved on a section of the adjusting screw passing through the semicircular slide, and one end of the adjusting screw away from the L-shaped support plate passes through the fixed plate and rotates inside the fixed plate.
[0014] Furthermore, a ball bearing adapted to the rotating shaft is installed on the top surface of the bearing seat, and nuts are locked at the front and rear ends of the rotating shaft that passes through the L-shaped support plate.
[0015] Furthermore, a bottom plate is fixed to the bottom surface of the hollow tube, and the bottom end surface of the bottom plate is fixedly connected to the upper surface of the L-shaped support plate.
[0016] Furthermore, threaded holes are provided on the side walls of the hollow tube, and threads matching the screw rod are arranged inside the threaded holes. A layer of rubber sheet is adhered to the outer ring surface of the movable column by glue to increase the friction force with the end of the screw rod located inside the hollow tube.
[0017] Compared with the prior art, the patient limb lifting and adjustment device for interventional surgery provided by the present invention has the following beneficial effects: 1. The present invention sets a limb lifting mechanism, uses an arc-shaped support plate with an inward concave shape to fit the curved surface of the limb, and places the limb on the arc-shaped support plate. With the help of the axle pin between the latch and the connecting block, the arc-shaped support plate can change the pitch angle according to the angle between the limb and the horizontal plane, thereby avoiding the problem of local compression caused by the small contact area between the support plate and the limb. At the same time, it can allow the patient's puncture limb to maintain a relatively stable posture during the operation, which is convenient for the puncture operation.
[0018] 2. The present invention realizes that during the interventional surgery, the two movable columns can move up and down synchronously through the cooperation of the limb angle adjustment mechanism and the limb lifting mechanism, so that the limbs can be lifted, and the left and right placement angles of the patient's limbs can be adjusted at will according to the needs of the surgery, so that the sides of the limbs can be exposed, which facilitates the surgery, expands the scope of the surgical operation, and is also convenient for limb disinfection before puncture. Moreover, by arranging a limb end limiting mechanism on the arc-shaped support plate, the limb can be automatically tightened to prevent it from moving around and maintain its posture during the interventional surgery. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces and describes the drawings required for use in the embodiments of the present invention or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0020] Figure 1 is a schematic diagram of the overall structure of a limb lifting and adjusting bracket according to an embodiment of the present invention; Figure 2 is a schematic diagram of a base member in an embodiment of the present invention; Figure 3 is a schematic diagram of a limb placement bracket after being flipped 180 degrees in an embodiment of the present invention; Figure 4 is a schematic diagram of a limb angle adjustment mechanism in an embodiment of the present invention; Figure 5 is a schematic diagram of a limb lifting mechanism in an embodiment of the present invention; Figure 6 Schematic diagram of a limb end restriction mechanism in an embodiment of the present invention.
[0021] In the figure: 1. Base; 2. Limb placement bracket; 21. Arc-shaped support plate; 22. Latch; 23. Axle pin; 24. Connecting block; 25. Arc-shaped silicone plate; 3. Limb angle adjustment mechanism; 31. Pad; 32. Fixing plate; 33. Adjusting screw; 34. Semicircular slide; 35. L-shaped support plate; 36. Bearing seat; 37. Rotating shaft; 4. Limb lifting mechanism; 41. Bottom plate; 42. Hollow tube; 43. Socket; 44. Movable column; 45. Screw; 5. Limb end limiting mechanism; 51. Servo motor; 52. Transmission shaft; 53. Winding roller; 54. Support frame; 55. Elastic belt; 6. Rubber anti-slip pad. DETAILED DESCRIPTION
[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0023] In order to more clearly explain and illustrate the technical solution and implementation of the present invention, preferred specific embodiments for implementing the technical solution of the present invention are introduced below.
[0024] Embodiment: The following is a preferred technical solution for a patient limb lifting and adjustment device for interventional surgery: Figure 1 As shown, it includes a base 1, and a limb angle adjustment mechanism 3 is arranged on both sides of the top surface of the base 1, and a limb lifting mechanism 4 is fixedly connected to the top surface of the limb angle adjustment mechanism 3, and a limb placement bracket 2 is hinged at the top of the limb lifting mechanism 4; a limb end limiting mechanism 5 is arranged on the front side of the upper surface of the limb placement bracket 2. A rubber anti-skid pad 6 is fixedly connected to the bottom surface of the base 1 by an adhesive, and a plurality of anti-skid grooves are arranged on the bottom surface of the rubber anti-skid pad 6, and the edge of the upper surface of the base 1 is chamfered.
[0025] Reference Figure 3 As shown: the limb placement bracket 2 includes an arc-shaped support plate 21, an arc-shaped silicone plate 25 fixed to the upper surface of the arc-shaped support plate 21 by adhesive, and two connecting blocks 24 fixed to the left and right sides of the lower surface of the arc-shaped support plate 21, the bottom end of the connecting block 24 is fixedly connected to a plug 22, and an axle pin 23 is inserted and rotated inside the plug 22; Reference Figure 4 As shown: the limb angle adjustment mechanism 3 includes a cushion block 31, two fixing plates 32 fixedly connected to the front and rear sides of the upper surface of the cushion block 31, and two bearing seats 36 fixed to the upper surface of the fixing plate 32, a rotating shaft 37 is rotatably arranged inside the bearing seat 36, and L-shaped support plates 35 are fixed to the front and rear ends of the rotating shaft 37, and a semicircular slideway 34 is opened inside the L-shaped support plate 35, and an adjusting screw 33 penetrating the fixing plate 32 is arranged inside the semicircular slideway 34; Reference Figure 5 As shown: the limb lifting mechanism 4 includes a hollow tube 42, a movable column 44 inserted into the inner cavity of the hollow tube 42, and a socket 43 opened in the top end face of the movable column 44, and a screw rod 45 is screwed through the side wall of the hollow tube 42, and one end of the screw rod 45 is located in the inner cavity of the hollow tube 42 and contacts with the outer ring surface of the movable column 44.
[0026] Reference Figure 6As shown: the limb end limiting mechanism 5 includes a servo motor 51 fixed to the left side of the upper surface of the arc-shaped support plate 21, a transmission shaft 52 connected to the output shaft of the servo motor 51 through a coupling, a winding roller 53 is connected to the end of the transmission shaft 52, an elastic band 55 is wound around the outer ring of the winding roller 53, and a support frame 54 is fixed to the upper surface of the arc-shaped support plate 21, the end of the winding roller 53 is inserted into the interior of the support frame 54 for rotation, and a bearing adapted to the end of the winding roller 53 is arranged inside the support frame 54.
[0027] Reference Figure 3 As shown: the upper surface of the arc-shaped support plate 21 is provided with a concave surface that is sunken downward, the bottom surface of the arc-shaped silicone plate 25 is attached to the concave surface of the upper surface of the arc-shaped support plate 21, and the upper surface of the arc-shaped silicone plate 25 is covered with a disposable medical sterile cloth. The plug 22 is inserted into the inner cavity of the socket 43, and the plug 22 and the left and right side walls of the socket 43 are both provided with through holes for the shaft pin 23 to pass through, wherein the left and right ends of the shaft pin 23 pass through the inside of the socket 43; there is a spacing of 1-2 cm between the bottom end face of the connecting block 24 and the top end face of the movable column 44, so that the plug 22 does not contact the top of the movable column 44 when rotating along the axis of the shaft pin 23.
[0028] Reference Figure 4 As shown: the bottom surface of the cushion block 31 is fixedly connected to the upper surface of the base 1, the fixing plate 32 is "L" shaped, and there is a gap of 1-2 cm between the side of the fixing plate 32 that is close to each other and the front and rear end surfaces of the cushion block 31. The end of the adjusting screw 33 away from the fixing plate 32 passes through the inside of the semicircular slide 34, and a nut is sleeved on a section of the adjusting screw 33 passing through the semicircular slide 34, and the end of the adjusting screw 33 away from the L-shaped support plate 35 passes through the fixing plate 32 and rotates inside the fixing plate 32. The top surface of the bearing seat 36 is installed with ball bearings that are compatible with the rotating shaft 37, and the front and rear ends of the rotating shaft 37 that passes through the L-shaped support plate 35 are locked with nuts.
[0029] Reference Figure 5 As shown: a bottom plate 41 is fixed to the bottom surface of the hollow tube 42, the bottom end surface of the bottom plate 41 is fixedly connected to the upper surface of the L-shaped support plate 35, threaded holes are provided on the side walls of the hollow tube 42, and threads adapted to the screw rod 45 are provided inside the threaded holes, and a layer of rubber sheet is adhered to the outer ring surface of the movable column 44 by glue to increase the friction with the end of the screw rod 45 located inside the hollow tube 42.
[0030] According to the content of the preferred technical solution provided above, compared with the existing brace used in interventional treatment, the height of the movable column 44 is adjusted by using the screw rod 45, which not only has the ability to infinitely adjust the height, but also the up and down movement of the two movable columns 44 is synchronous, which also improves the smoothness of limb height adjustment. In addition, the arc-shaped support plate 21 has an inwardly concave surface, and the arc-shaped silicone plate 25 and the sterile cloth are fixed in the concave surface. The concave surfaces of the arc-shaped support plate 21 and the arc-shaped silicone plate 25 increase the contact area of the limb, and the softness of the arc-shaped silicone plate 25 can reduce the discomfort of the limb when it is placed for a long time.
[0031] In addition, when the limb is placed on the arc-shaped support plate 21 and the limb is raised by the limb lifting mechanism 4, the angle between the limb and the horizontal plane becomes larger, and the axle pin 23 provides the arc-shaped support plate 21 with the ability to rotate freely, changing its own pitch angle according to the angle between the limb and the horizontal plane, thereby avoiding the problem of local compression due to the small contact area between the arc-shaped support plate 21 and the limb.
[0032] The limb angle adjustment mechanism 3 is based on the placement of the limb on the arc-shaped support plate 21, and utilizes the sliding position of the adjustment screw 33 on the semicircular slide 34 to enable the patient's limb to be freely adjusted to the left and right angles according to surgical needs, so that the side of the limb can be exposed, facilitating the operation and expanding the scope of surgical operation.
[0033] Working principle: Before the interventional surgery begins, the patient's limb is placed in the concave surface of the upper surface of the arc-shaped support plate 21. The arc-shaped support plate 21 has an arc as a whole, and the surface of the limb can be sunken in the concave surface. In addition, the restriction of the screw rod 45 on the movable column 44 is loosened, and the movable column 44 is pulled out from the inside of the hollow tube 42. After locking the screw rod 45, the arc-shaped support plate 21 changes its pitch angle by means of the latch pin 22 and the shaft pin 23, and raises the height of the limb.
[0034] During the interventional treatment process, the nut on the adjusting screw 33 is loosened to make the adjusting screw 33 move along an arc inside the semicircular slide 34 until the adjusting screw 33 moves to the specified position, and then the nut on the adjusting screw 33 is tightened again. At this time, the two L-shaped support plates 35 are pulled by the rotating shaft 37 to the same angle, and the L-shaped support plate 35 allows the limb lifting mechanism 4 and the limb placing bracket 2 to tilt to the left or right, thereby changing the left and right angles of the limb after being placed on the upper surface of the arc-shaped support plate 21.
[0035] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone should be aware that any structural changes made under the inspiration of the present invention, and any technical solutions that are the same or similar to the present invention, fall within the protection scope of the present invention. Finally, it should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the restrictive conditions that can be implemented in this application, so they have no technical substantive significance. Any structural modification, change in proportional relationship or adjustment of size, without affecting the effects that can be produced by this application and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in this application.
Claims
1. A patient limb lifting and adjustment device for interventional surgery, comprising a base (1), characterized in that: A limb angle adjustment mechanism (3) is provided on both left and right sides of the top surface of the base (1); a limb lifting mechanism (4) is fixedly connected to the top surface of the limb angle adjustment mechanism (3); a limb placement bracket (2) is hingedly connected to the top of the limb lifting mechanism (4); and a limb end limiting mechanism (5) is provided on the front side of the upper surface of the limb placement bracket (2); The limb placement bracket (2) comprises an arc-shaped support plate (21), an arc-shaped silicone plate (25) fixed to the upper surface of the arc-shaped support plate (21) by adhesive, and two connecting blocks (24) fixed to the left and right sides of the lower surface of the arc-shaped support plate (21), the bottom end of each connecting block (24) is fixedly connected to a latch (22), and an axle pin (23) is rotatably penetrated inside the latch (22); The limb angle adjustment mechanism (3) comprises a cushion block (31), two fixing plates (32) fixedly connected to the front and rear sides of the upper surface of the cushion block (31), and two bearing seats (36) fixed to the upper surface of the fixing plates (32), a rotating shaft (37) being rotatably arranged inside the bearing seat (36), an L-shaped support plate (35) being fixed to the front and rear ends of the rotating shaft (37), a semicircular slideway (34) being provided inside the L-shaped support plate (35), and an adjusting screw (33) penetrating the fixing plate (32) being provided inside the semicircular slideway (34); The limb lifting mechanism (4) comprises a hollow tube (42), a movable column (44) inserted into the inner cavity of the hollow tube (42), and a socket (43) provided in the top end surface of the movable column (44), and a screw rod (45) is screwed through the side wall of the hollow tube (42), and one end of the screw rod (45) located in the inner cavity of the hollow tube (42) contacts the outer ring surface of the movable column (44); The limb end limiting mechanism (5) comprises a servo motor (51) fixed to the left side of the upper surface of the arc-shaped support plate (21), a transmission shaft (52) connected to the output shaft of the servo motor (51) via a coupling, a winding roller (53) connected to the end of the transmission shaft (52), an elastic band (55) wound around the outer ring of the winding roller (53), and a support frame (54) fixed to the upper surface of the arc-shaped support plate (21), the end of the winding roller (53) inserted into the interior of the support frame (54) for rotation, and a bearing adapted to the end of the winding roller (53) is arranged inside the support frame (54).
2. The device for lifting and adjusting a patient's limb for interventional surgery according to claim 1, characterized in that: A rubber anti-skid pad (6) is fixedly connected to the bottom surface of the base (1) by means of an adhesive, and a plurality of anti-skid grooves are arranged on the bottom surface of the rubber anti-skid pad (6). The edge of the upper surface of the base (1) is chamfered with an arc.
3. The device for lifting and adjusting a patient's limb for interventional surgery according to claim 1, characterized in that: The upper surface of the arc-shaped support plate (21) is provided with a concave surface that is sunken downwards, the bottom surface of the arc-shaped silicone plate (25) is attached to the concave surface of the upper surface of the arc-shaped support plate (21), and the upper surface of the arc-shaped silicone plate (25) is covered with a disposable medical sterile cloth.
4. The patient limb lifting and adjustment device for interventional surgery according to claim 1, characterized in that: The plug (22) is inserted into the inner cavity of the socket (43), and the left and right side walls of the plug (22) and the socket (43) are both provided with through holes for the shaft pin (23) to pass through, wherein the left and right ends of the shaft pin (23) pass through the interior of the socket (43).
5. The patient limb lifting and adjustment device for interventional surgery according to claim 1, characterized in that: There is a spacing of 1-2 cm between the bottom end surface of the connection block (24) and the top end surface of the movable column (44), so that the latch (22) does not contact the top end of the movable column (44) when rotating along the axis of the shaft pin (23).
6. The patient limb lifting and adjustment device for interventional surgery according to claim 1, characterized in that: The bottom surface of the cushion block (31) is fixedly connected to the upper surface of the base (1); the fixing plate (32) is in an "L" shape, and a gap of 1-2 cm exists between the sides of the fixing plates (32) that are close to each other and the front and rear end surfaces of the cushion block (31).
7. The patient limb lifting and adjustment device for interventional surgery according to claim 1, characterized in that: One end of the adjusting screw (33) away from the fixing plate (32) passes through the interior of the semicircular slideway (34), a nut is sleeved on a section of the adjusting screw (33) passing through the semicircular slideway (34), and one end of the adjusting screw (33) away from the L-shaped supporting plate (35) passes through the fixing plate (32) and rotates inside the fixing plate (32).
8. The patient limb lifting and adjustment device for interventional surgery according to claim 1, characterized in that: The top surface of the bearing seat (36) is mounted with a ball bearing matched with the rotating shaft (37), and the rotating shaft (37) passes through the L-shaped support plate (35) and is locked with nuts at both the front and rear ends.
9. The patient limb lifting and adjustment device for interventional surgery according to claim 1, characterized in that: A bottom plate (41) is fixed to the bottom surface of each hollow tube (42), and a bottom end surface of the bottom plate (41) is fixedly connected to the upper surface of the L-shaped support plate (35).
10. The patient limb lifting and adjustment device for interventional surgery according to claim 1, characterized in that: The side walls of the hollow tube (42) are provided with threaded holes, and the inside of the threaded holes is provided with threads adapted to the screw rod (45). A layer of rubber sheet is adhered to the outer ring surface of the movable column (44) by glue, so as to increase the friction force with the end of the screw rod (45) located inside the hollow tube (42).