An ankle joint fusion surgery screw placement guide

Abstract

This invention provides a screw placement guide for ankle fusion surgery, belonging to the field of medical devices. It includes multiple elastic locking mechanisms and multiple omnidirectional positioning mechanisms. Internally, it comprises a rectangular frame fixedly mounted on the bottom of a longitudinal hollow shell, a longitudinal slider movable along the longitudinal direction of the rectangular frame, a rotating ball head rotatably mounted in the middle of the rectangular frame, and a positioning hole disposed in the rotating ball head for positioning the fusion screw. This application utilizes the elastic friction of a fixed ring to achieve a circular motion-type position change function around the fixed ring. Under the action of frictional resistance, the connecting parts are less prone to precision deviation. Furthermore, utilizing the ball joint principle, the positioning hole for positioning the fusion screw can have a wide range of angular changes within space, thereby improving the positioning angle range for the fusion screw.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and more specifically, to a screw placement guide for ankle joint fusion surgery. Background Technology

[0002] During ankle joint fusion and internal fixation with screws, 2-3 cannulated screws are typically implanted from different angles to fix the ankle joint. Before inserting the cannulated screws, a guide pin is inserted into the patient's ankle joint. Then, the cannulated screw is placed on the guide pin and screwed into the patient's ankle joint before the guide pin is removed. During the operation, the fusion positioning generally relies entirely on the surgeon's experience. The guide pin often needs to be fixed multiple times during the operation to achieve the best position, resulting in a long operation time and significant trauma. At the same time, it is necessary to avoid the cannulated screws crossing within the ankle joint cavity, which could lead to failure. Repeated X-ray imaging of the ankle joint is required to determine the angle of cannulated screw fixation, which prolongs the operation time, increases radiation exposure, affects the patient's health, and reduces the efficiency of the operation.

[0003] Existing common ankle fusion screw placement guides have the following two defects in actual surgery: First, the connecting arm is locked to the outer wall of the fixing ring by a locking screw. During the positioning process, the connecting arm is prone to displacement due to the rotation of the screw, resulting in deviation in positioning accuracy. Second, the circular hole used to position the fusion screw can only change angle in one longitudinal plane, resulting in an overly narrow and low adjustment range for the fusion screw angle. Summary of the Invention

[0004] In view of the problems existing in the prior art, the purpose of this invention is to provide a screw placement guide for ankle joint fusion surgery.

[0005] To solve the above problems, the present invention adopts the following technical solution:

[0006] An ankle fusion surgery screw placement guide includes a fixing ring that can be fixed to the periphery of the patient's lower leg, a convex ring structure disposed on the annular end face of the fixing ring, and a T-shaped ring structure disposed inside the lower annular end of the fixing ring. It also includes multiple elastic abutment locking mechanisms, each containing a bottom slide rail that can slide along the T-shaped ring structure, a hollow longitudinal shell disposed at the bottom of the bottom slide rail, an abutment brake rod placed inside the hollow longitudinal shell and locking the spatial position of the hollow longitudinal shell through contact with the fixing ring, and a first helical spring that exerts an upward elastic force on the abutment brake rod. Furthermore, it includes multiple omnidirectional positioning mechanisms, each containing a rectangular frame fixedly installed at the bottom of the hollow longitudinal shell, a longitudinal slider movable along the longitudinal direction of the rectangular frame, a rotating ball head rotatably mounted in the middle of the rectangular frame, and a positioning hole disposed in the rotating ball head for positioning the fusion screw.

[0007] Optionally, the elastic abutment locking mechanism further includes a built-in movable plate. The top of the bottom slide rail is provided with a concave groove that can be engaged with the outer periphery of the T-shaped ring structure and slide along the outer periphery of the T-shaped ring structure. The bottom of the longitudinal hollow shell is provided with a first docking plate integrally formed with it. The interior of the longitudinal hollow shell is provided with a longitudinal component movable cavity. The longitudinal hollow shell is provided with a longitudinal limiting groove on each of the symmetrical sides of the longitudinal component movable cavity, communicating with the external space and the side of the longitudinal component movable cavity. The top of the longitudinal hollow shell is provided with a connecting groove. The first rod has a through hole at the top of the longitudinal component's movable cavity and at the bottom of the concave slide groove. The longitudinal hollow shell has an internal movable plate inside the longitudinal component's movable cavity that can move axially along the longitudinal component's movable cavity. A first helical spring in a compressed state is placed at the bottom of the internal movable plate. An abutting brake rod that passes through the first rod's through hole and abuts against the bottom surface of the T-shaped ring structure is fixedly installed at the top of the internal movable plate. A horizontal force-applying rod that passes through the longitudinal limiting slide groove and can move axially along the longitudinal limiting slide groove is fixedly installed on both sides of the internal movable plate.

[0008] Optionally, the length of the horizontal force-applying rod is greater than the depth of the hole in the first rod.

[0009] Optionally, the omnidirectional positioning mechanism further includes a first embedding groove and a second embedding groove. The top of the rectangular frame is provided with a second docking plate integrally formed with it and fixedly installed at the bottom of the first docking plate. The interior of the rectangular frame is provided with a rectangular movable opening with a hollow center. The interior of the longitudinal slider is provided with two sleeve structures that can slide along the longitudinal rod of the rectangular frame. The longitudinal slider is provided with a first embedding groove on one side of the sleeve structure. The longitudinal slider is embedded with a first braking rubber pad whose side abuts against the outside of the side structure of the rectangular frame inside the first embedding groove. The center of the longitudinal slider is provided with a spherical cavity with open ends. The longitudinal slider is provided with a second embedding groove on the periphery of the middle region of the spherical cavity. The longitudinal slider is provided with a rotatable rotating ball head inside the spherical cavity. The interior of the second embedding groove is embedded with a second braking rubber pad whose inner side abuts against the outer surface of the rotating ball head. The center of the rotating ball head is provided with a positioning hole with open ends.

[0010] Optionally, the structural radius of the spherical cavity matches the structural radius of the rotating ball head, and the diameters at both ends of the spherical cavity opening are the same and both smaller than the structural diameter of the rotating ball head.

[0011] Optionally, the frictional braking strength of the first braking rubber pad on the rectangular frame and the longitudinal slider is sufficient to keep the rectangular frame and the longitudinal slider stationary without being subjected to external force, and the frictional braking strength of the second braking rubber pad on the longitudinal slider and the rotating ball head is sufficient to keep the rotating ball head stationary without being subjected to external force.

[0012] Optionally, it also includes multiple double-helix telescopic clamping mechanisms, each having a hollow internal structure fixedly mounted above a convex ring structure, an inner telescopic rod capable of moving axially along the horizontal hollow internal structure, an elastic air membrane mounted at one end of the inner telescopic rod and capable of contacting the patient's lower leg, and a piston body placed inside the inner telescopic rod and controlled by liquid pressure so that the elastic air membrane contacts the patient's lower leg under liquid pressure.

[0013] Optionally, the double-helix telescopic clamping mechanism further includes a second helical spring and a third helical spring. A fixed plate structure integrally formed with the horizontal hollow outer shell is provided in the middle of the shell. The bottom of the fixed plate structure has a concave structure and a fixed groove structure fixedly installed outside the convex ring structure. A horizontal component movable cavity is provided inside the horizontal hollow outer shell. One end of the horizontal hollow outer shell has a second rod through-hole connecting the external space and one end of the horizontal component movable cavity. The other end of the horizontal hollow outer shell has a third rod through-hole connecting the external space and the other end of the horizontal component movable cavity. A limiting movable ring capable of moving axially along the horizontal component movable cavity is placed inside the horizontal hollow outer shell within the horizontal component movable cavity. The center of the limiting movable ring is provided with… The inner telescopic rod, which is integral with the structure and passes through the second and third rod holes, has a second helical spring fitted at one end of the limiting ring. A hollow contact shell is fixedly installed at one end of the inner telescopic rod. The hollow contact shell has a liquid compression chamber with one end open. An elastic gas film is fixedly installed at the open end of the hollow contact shell located in the liquid compression chamber. A force-applying plate is fixedly installed at the other end of the inner telescopic rod. A liquid flow chamber with one end connected to the liquid compression chamber is provided inside the inner telescopic rod. A piston body capable of moving along its axial direction is placed inside the liquid flow chamber. A third helical spring is placed at one end of the piston body. The closed area formed by the other end of the piston body, the liquid flow chamber, the liquid compression chamber, and the elastic gas film is filled with buffer solution.

[0014] Optionally, both the second and third helical springs are in a compressed state.

[0015] Optionally, the elastic air film is a sheet-like structure made of rubber material with elastic extensibility, and the edge of the sheet-like structure is embedded inside the opening end of the hollow contact shell.

[0016] Compared with the prior art, the technical solution provided by this invention has at least the following beneficial effects:

[0017] In the above scheme, the elastic friction force on the fixed ring can be used to realize the function of circumferential movement and position change around the fixed ring. Under the action of frictional resistance, the connecting parts are less prone to precision deviation. In addition, by using the ball joint principle, the positioning hole used to position the fusion pin can have a large range of angle changes in space, thereby improving the positioning angle range of the fusion pin. Attached Figure Description

[0018] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the invention and, together with the specification, further serve to explain the principles of the invention and enable those skilled in the art to practice and use the invention.

[0019] Figure 1 This is a perspective view of the present invention;

[0020] Figure 2 This is a three-dimensional cross-sectional view of the present invention;

[0021] Figure 3 This is a perspective view of the elastic abutment locking mechanism in this invention;

[0022] Figure 4 This is a perspective cross-sectional view of the elastic abutment locking mechanism in this invention;

[0023] Figure 5 This is a perspective view of the omnidirectional mobile positioning mechanism in this invention;

[0024] Figure 6 This is a three-dimensional cross-sectional view of the universal moving positioning mechanism in this invention;

[0025] Figure 7 This is a perspective view of the double-helix telescopic clamping mechanism in this invention;

[0026] Figure 8 This is a three-dimensional cross-sectional view of the double-helix telescopic clamping mechanism in this invention.

[0027] [Figure Labels]

[0028] 1. Fixed ring; 2. Convex ring structure; 3. T-shaped ring structure;

[0029] 4. Elastic anti-locking mechanism; 41. Longitudinal hollow shell; 42. First docking plate; 43. Bottom slide rail; 44. Concave slide groove; 45. Longitudinal component movable cavity; 46. Longitudinal limiting slide groove; 47. First rod through hole; 48. Built-in movable plate; 49. Horizontal force bar; 410. First helical spring; 411. Anti-locking brake rod;

[0030] 5. Universal moving positioning mechanism; 51. Rectangular frame; 52. Second docking plate; 53. Rectangular movable opening; 54. Longitudinal slider; 55. Sleeve structure; 56. First brake rubber pad; 57. Spherical cavity; 58. Rotating ball head; 59. Second brake rubber pad; 510. Positioning hole; 511. First embedding groove; 512. Second embedding groove;

[0031] 6. Double-helix telescopic clamping mechanism; 61. Horizontal hollow outer shell; 62. Fixed plate structure; 63. Fixed groove structure; 64. Horizontal component movable cavity; 65. Second rod through hole; 66. Third rod through hole; 67. Limiting movable ring; 68. Inner telescopic rod; 69. Force application plate; 610. Second helical spring; 611. Liquid flow cavity; 612. Hollow contact shell; 613. Liquid compression cavity; 614. Third helical spring; 615. Elastic air film; 616. Piston body.

[0032] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to this specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs. Detailed Implementation

[0033] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. It should also be noted that, to make the embodiments more comprehensive, the following embodiments are the best and preferred embodiments, and those skilled in the art can use other alternative methods to implement some well-known technologies; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0034] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the art.

[0035] Generally, terms can be understood at least partly from their use in context. For example, depending at least partly on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood not necessarily to convey an exclusive set of factors, but rather, alternatively, depending at least partly on the context, to allow for the presence of other factors that are not necessarily explicitly described.

[0036] It is understood that the meanings of “on”, “above”, and “above” in this invention should be interpreted in the broadest manner, such that “on” means not only “directly on” something, but also includes the meaning of being “on” something with an intervening feature or layer, and that “above” or “above” means not only “on” something, but also includes the meaning of being “on” something without an intervening feature or layer.

[0037] Furthermore, spatially related terms such as “below,” “under,” “lower,” “above,” and “upper” are used herein for convenience to describe the relationship of one element or feature to one or more other elements or features, as illustrated in the accompanying drawings. Spatially related terms are intended to cover different orientations in the use or operation of the device other than those depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially related descriptive terms used herein can be interpreted similarly.

[0038] like Figure 1 and Figure 2 As shown, this embodiment of the invention provides a screw placement guide for ankle joint fusion surgery, including a fixing ring 1 that can be fixed to the periphery of the patient's lower leg, a convex ring structure 2 disposed on the annular end face of the fixing ring 1, and a T-shaped ring structure 3 disposed inside the lower annular end of the fixing ring 1. The fixing ring 1 is worn on the patient's lower leg, so that the lower leg is located in the central area of ​​the fixing ring 1.

[0039] like Figures 1 to 4As shown, in order to achieve the frictional braking effect with the fixed ring 1, multiple elastic contact locking mechanisms 4 are required. Each mechanism includes a bottom slide rail 43 that slides along the T-shaped ring structure 3, a hollow longitudinal shell 41 located at the bottom of the bottom slide rail 43, a contact brake rod 411 placed inside the hollow longitudinal shell 41 and locking the hollow longitudinal shell 41 in space by contacting the fixed ring 1, and a first helical spring 410 that exerts an upward elastic force on the contact brake rod 411. The bottom slide rail 43 is subjected to the torque required for rotation. When this torque exceeds the frictional force exerted by the first helical spring 410 on the contact brake rod 411 and the T-shaped ring structure 3, the bottom slide rail 43 will cause the hollow longitudinal shell 41 to move spatially. When it reaches the appropriate position, the hollow longitudinal shell 41 is locked under the elastic action of the first helical spring 410, thus achieving the frictional braking effect with the fixed ring 1.

[0040] like Figure 3 and Figure 4 As shown, the elastic abutment locking mechanism 4 also includes a built-in movable plate 48. The top of the bottom slide rail 43 is provided with a concave slide groove 44 that can be engaged with the outer periphery of the T-shaped ring structure 3 and slide along the outer periphery of the T-shaped ring structure 3. The bottom of the longitudinal hollow shell 41 is provided with a first docking plate 42 integrally formed with it. The interior of the longitudinal hollow shell 41 is provided with a longitudinal component movable cavity 45. The longitudinal hollow shell 41 is provided with a longitudinal limiting slide groove 46 on each of the symmetrical sides of the longitudinal component movable cavity 45, which connects the external space and the side of the longitudinal component movable cavity 45. The top of the longitudinal hollow shell 41 is provided with a groove 44 that connects the top of the longitudinal component movable cavity 45 and the concave slide groove 44. The first rod through hole 47 at the bottom end, the longitudinal hollow shell 41 has an internal movable plate 48 that can move axially along the longitudinal component movable cavity 45 inside the longitudinal component movable cavity 45, the bottom of the internal movable plate 48 has a first helical spring 410 in a compressed state, the top of the internal movable plate 48 has a contact brake rod 411 that passes through the first rod through hole 47 and abuts against the bottom surface of the T-shaped ring structure 3, and the two sides of the internal movable plate 48 have a horizontal force rod 49 that passes through the longitudinal limiting slide groove 46 and can move axially along the longitudinal limiting slide groove 46. The length of the horizontal force rod 49 is greater than the depth of the first rod through hole 47.

[0041] like Figure 1 , Figure 2 , Figure 5 and Figure 6As shown, in order to achieve the function of controlling the longitudinal height and angle of the positioning hole 510, multiple universal movable positioning mechanisms 5 need to be set up. Each mechanism has a rectangular frame 51 fixedly installed at the bottom of the longitudinal hollow shell 41, a longitudinal slider 54 that can move longitudinally along the rectangular frame 51, a rotating ball head 58 rotatably installed in the middle of the rectangular frame 51, and a positioning hole 510 set in the rotating ball head 58 for positioning the fusion screw. A longitudinal force is applied to the longitudinal slider 54. When this force is greater than the maximum static force formed by the first brake rubber pad 56... When friction is applied, the longitudinal slider 54 will move longitudinally until it reaches a suitable height. Then, a torque is applied to the rotating ball head 58. When the torque is greater than the maximum static friction force formed by the second brake rubber pad 59, the rotating ball head 58 will rotate, causing the positioning hole 510 located at the center of the rotating ball head 58 to align with the required installation location of the fusion staple. This completes the positioning of the positioning hole 510. During surgery, the positioning operation of the fusion staple is achieved through the positioning hole 510, thereby realizing the control function of the longitudinal height and angle of the positioning hole 510.

[0042] like Figure 5 and Figure 6As shown, the omnidirectional positioning mechanism 5 further includes a first embedding groove 511 and a second embedding groove 512. The top of the rectangular frame 51 is provided with a second docking plate 52, integrally structured with it and fixedly installed at the bottom of the first docking plate 42. The interior of the rectangular frame 51 is provided with a rectangular movable opening 53 with a hollow center. The interior of the longitudinal slider 54 is provided with two sleeve structures 55 that can slide along the longitudinal rod of the rectangular frame 51. The longitudinal slider 54 has a first embedding groove 511 on one side of the sleeve structure 55. A first braking rubber pad 56, with its side abutting against the outside of the side structure of the rectangular frame 51, is embedded inside the first embedding groove 511. The center of the longitudinal slider 54 is provided with a spherical cavity 57 with open ends. The longitudinal slider 54 has a second embedding groove 512 on the periphery of the central region of the spherical cavity 57. The longitudinal slider 54 is placed inside the spherical cavity 57, and a rotatable ball head 58 is placed inside the groove 512. A second braking rubber pad 59 is embedded inside the second insertion groove 512, with its inner side abutting against the outer surface of the ball head 58. The ball head 58 has a positioning hole 510 with both ends open at its center. The structural radius of the spherical cavity 57 matches the structural radius of the ball head 58, and the diameters of the two ends of the spherical cavity 57 are the same and smaller than the structural diameter of the ball head 58. The frictional braking strength of the first braking rubber pad 56 on the rectangular frame 51 and the longitudinal slider 54 is sufficient to keep the rectangular frame 51 and the longitudinal slider 54 stationary without external force. The frictional braking strength of the second braking rubber pad 59 on the longitudinal slider 54 and the ball head 58 is sufficient to keep the ball head 58 stationary without external force.

[0043] like Figure 1 , Figure 2 , Figure 7 and Figure 8As shown, to achieve the clamping and fixing effect on the patient's lower leg, multiple double-helix telescopic clamping mechanisms 6 are required. Each mechanism includes a horizontal hollow shell 61 with a hollow interior, fixedly mounted above a convex ring structure 2; an inner telescopic rod 68 capable of axial movement along the horizontal hollow shell 61; an elastic air membrane 615 mounted at one end of the inner telescopic rod 68 and able to abut against the patient's lower leg; and a piston body 616 placed inside the inner telescopic rod 68. By controlling the liquid pressure, the elastic air membrane 615 abuts against the patient's lower leg under liquid pressure, pulling outwards the force-applying plates 69. Then, the fixing ring... 1. When worn on the patient's calf, with the calf positioned in the center of the fixing ring 1, the tension on each force plate 69 is released. Under the action of the second helical spring 610, the inner telescopic rod 68 moves toward the patient's calf until the elastic air membrane 615 and the hollow contact shell 612 contact the patient's calf. At this time, the elastic air membrane 615 located near the calf undergoes adaptive deformation due to the force of the calf, causing the elastic air membrane 615 to wrap around the contact area of ​​the calf, thereby reducing the clamping strength per unit area and reducing the pain in the patient's calf, thus achieving the clamping and fixing effect on the patient's calf.

[0044] like Figure 7 and Figure 8As shown, the double-helix telescopic clamping mechanism 6 further includes a second helical spring 610 and a third helical spring 614. A fixed plate structure 62, integrally formed with the horizontal hollow outer shell 61, is provided in the middle of the shell. The bottom of the fixed plate structure 62 has a concave structure and a fixed groove structure 63 fixedly installed outside the convex ring structure 2. A horizontal component movable cavity 64 is provided inside the horizontal hollow outer shell 61. A second rod is provided at one end of the horizontal hollow outer shell 61, connecting the external space and one end of the horizontal component movable cavity 64. The horizontal hollow outer shell 61 has a third rod-body through-hole 66 at one end, which connects to the external space and the other end of the horizontal component movable cavity 64. A limiting movable ring 67 capable of moving axially along the horizontal component movable cavity 64 is placed inside the horizontal hollow outer shell 61. An inner telescopic rod 68, integrally formed with the limiting movable ring 67 and passing through the second rod-body through-hole 65 and the third rod-body through-hole 66, is located at the center of the limiting movable ring 67. A second helical spring 6 is fitted onto one end of the limiting movable ring 67. 10. A hollow contact shell 612 is fixedly installed at one end of the inner telescopic rod 68. The hollow contact shell 612 has an open-ended liquid compression chamber 613 inside. An elastic gas film 615 is fixedly installed at the open end of the hollow contact shell 612 located in the liquid compression chamber 613. A force-applying plate 69 is fixedly installed at the other end of the inner telescopic rod 68. A liquid flow chamber 611, with one end connected to the liquid compression chamber 613, is provided inside the inner telescopic rod 68. A liquid flow chamber 611 containing a component capable of flowing along... The piston body 616 moves axially. A third helical spring 614 is placed at one end of the piston body 616. The other end of the piston body 616, the liquid flow chamber 611, the liquid compression chamber 613 and the elastic gas film 615 form a closed area filled with buffer solution. The second helical spring 610 and the third helical spring 614 are both in a compressed state. The elastic gas film 615 is a sheet structure made of rubber material with elastic extensibility, and the edge of the sheet structure is embedded in the opening end of the hollow contact shell 612.

[0045] The specific working process of the technical solution provided in this application is as follows:

[0046] In use, pull each force-applying plate 69 outwards, then put the fixing ring 1 on the patient's lower leg, so that the lower leg is in the center area of ​​the fixing ring 1. Release the tension on each force-applying plate 69. Under the action of the second helical spring 610, the inner telescopic rod 68 will move towards the patient's lower leg until the elastic air membrane 615 and the hollow contact shell 612 contact the patient's lower leg. At this time, the elastic air membrane 615 located near the lower leg will undergo adaptive deformation due to the force of the lower leg, so that the elastic air membrane 615 wraps around the contact part of the lower leg, applying the torque required for rotation to the bottom slide rail 43. When this torque is greater than the frictional force formed by the first helical spring 410 on the contact brake rod 411 and the T-shaped ring structure 3, the bottom slide rail 43 will drive the longitudinal hollow shell 41 to move spatially. When it moves to the appropriate position... During positioning, the first helical spring 410 acts elastically to lock the longitudinal hollow shell 41, applying a longitudinal force to the longitudinal slider 54. When this force exceeds the maximum static friction force generated by the first brake rubber pad 56, the longitudinal slider 54 will move longitudinally until it reaches a suitable height. Then, a torque is applied to the rotating ball head 58. When the torque exceeds the maximum static friction force generated by the second brake rubber pad 59, the rotating ball head 58 will rotate, aligning the positioning hole 510 at the center of the rotating ball head 58 with the required installation location of the fusion staple. This completes the positioning of the positioning hole 510. During surgery, the positioning operation of the fusion staple is achieved through the positioning hole 510, thereby controlling the longitudinal height and angle of the positioning hole 510.

[0047] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0048] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A screw placement guide for ankle arthroplasty, comprising a fixing ring capable of being fixed to the periphery of the patient's lower leg, a convex ring structure disposed on the annular end face of the fixing ring, and a T-shaped ring structure disposed inside the lower annular end of the fixing ring, characterized in that: It also includes, Multiple elastic contact locking mechanisms are provided inside, including a bottom slide rail that can slide along a T-shaped ring structure, a longitudinal hollow shell located at the bottom of the bottom slide rail and having a hollow interior, a contact brake rod placed inside the longitudinal hollow shell and locking the spatial position of the longitudinal hollow shell by contacting a fixed ring, and a first helical spring that exerts an upward elastic force on the contact brake rod. And multiple omnidirectional moving positioning mechanisms, which are internally provided with a rectangular frame fixedly installed at the bottom of the longitudinal hollow shell, a longitudinal slider that can move along the longitudinal direction of the rectangular frame, a rotating ball head that is rotatably installed in the middle of the rectangular frame, and a positioning hole provided in the rotating ball head for positioning the fusion screw. The elastic abutment locking mechanism also includes a built-in movable plate. The top of the bottom slide rail is provided with a concave slide groove that can be engaged with the outer periphery of the T-shaped ring structure and slide along the outer periphery of the T-shaped ring structure. The bottom of the longitudinal hollow shell is provided with a first docking plate integrally formed with it. The interior of the longitudinal hollow shell is provided with a longitudinal component movable cavity. The longitudinal hollow shell is provided with a longitudinal limiting slide groove on each of the symmetrical sides of the longitudinal component movable cavity, connecting the external space and the side of the longitudinal component movable cavity. The top of the longitudinal hollow shell is provided with a longitudinal... The first rod has a through hole at the top of the component's movable cavity and at the bottom of the concave slide groove. The longitudinal hollow shell has an internal movable plate that can move along the longitudinal component's movable cavity axially inside the longitudinal component's movable cavity. A first helical spring in a compressed state is placed at the bottom of the internal movable plate. An abutting brake rod that passes through the first rod's through hole and abuts against the bottom surface of the T-shaped ring structure is fixedly installed at the top of the internal movable plate. A horizontal force-applying rod that passes through the longitudinal limiting slide groove and can move along the longitudinal limiting slide groove axially is fixedly installed on both sides of the internal movable plate. The omnidirectional positioning mechanism further includes a first embedding groove and a second embedding groove. The top of the rectangular frame is provided with a second docking plate integrally formed with it and fixedly installed at the bottom of the first docking plate. The interior of the rectangular frame is provided with a rectangular movable opening with a hollow center. The interior of the longitudinal slider is provided with two sleeve structures that can slide along the longitudinal rod of the rectangular frame. The longitudinal slider is provided with a first embedding groove on one side of the sleeve structure. The longitudinal slider is embedded with a first braking rubber pad whose side abuts against the outside of the side structure of the rectangular frame inside the first embedding groove. The center of the longitudinal slider is provided with a spherical cavity with open ends. The longitudinal slider is provided with a second embedding groove on the periphery of the middle region of the spherical cavity. The longitudinal slider is provided with a rotatable rotating ball head inside the spherical cavity. The interior of the second embedding groove is embedded with a second braking rubber pad whose inner side abuts against the outer surface of the rotating ball head. The center of the rotating ball head is provided with a positioning hole with open ends. The ankle joint fusion surgery nail placement guide also includes multiple double-helix telescopic clamping mechanisms, which internally consist of a horizontal hollow shell with a hollow internal structure fixedly mounted above a convex ring structure, an inner telescopic rod capable of moving axially along the horizontal hollow shell, an elastic air membrane mounted at one end of the inner telescopic rod and capable of contacting the patient's lower leg, and a piston body placed inside the inner telescopic rod and controlled by liquid pressure so that the elastic air membrane contacts the patient's lower leg under liquid pressure.

2. The ankle joint fusion surgery screw placement guide according to claim 1, characterized in that: The length of the horizontal force-applying rod is greater than the depth of the hole in the first rod.

3. The ankle joint fusion surgery screw placement guide according to claim 1, characterized in that: The structural radius of the spherical cavity matches the structural radius of the rotating ball head, and the diameters at both ends of the spherical cavity opening are the same and both smaller than the structural diameter of the rotating ball head.

4. The ankle joint fusion surgery screw placement guide according to claim 3, characterized in that: The frictional braking strength of the first braking rubber pad on the rectangular frame and the longitudinal slider is sufficient to keep the rectangular frame and the longitudinal slider stationary without being subjected to external force. The frictional braking strength of the second braking rubber pad on the longitudinal slider and the rotating ball head is sufficient to keep the rotating ball head stationary without being subjected to external force.

5. The ankle joint fusion surgery screw placement guide according to claim 1, characterized in that: The double-helix telescopic clamping mechanism further includes a second helical spring and a third helical spring. A fixed plate structure integrally formed with the horizontal hollow outer shell is provided in the middle of the shell. The bottom of the fixed plate structure has a concave structure and a fixed groove structure fixedly installed outside the convex ring structure. A horizontal component movable cavity is provided inside the horizontal hollow outer shell. One end of the horizontal hollow outer shell has a second rod through-hole connecting the external space and one end of the horizontal component movable cavity. The other end of the horizontal hollow outer shell has a third rod through-hole connecting the external space and the other end of the horizontal component movable cavity. A limiting movable ring capable of moving axially along the horizontal component movable cavity is placed inside the horizontal hollow outer shell within the horizontal component movable cavity. The center of the limiting movable ring is provided with a... An inner telescopic rod with an integrated structure and penetrating through the second and third rod perforations has a second helical spring fitted at one end of the limiting movable ring. A hollow contact shell is fixedly installed at one end of the inner telescopic rod. The hollow contact shell has a liquid compression chamber with one end open. An elastic gas film is fixedly installed at the open end of the hollow contact shell located in the liquid compression chamber. A force-applying plate is fixedly installed at the other end of the inner telescopic rod. A liquid flow chamber with one end connected to the liquid compression chamber is provided inside the inner telescopic rod. A piston body capable of moving along its axial direction is placed inside the liquid flow chamber. A third helical spring is placed at one end of the piston body. The closed area formed by the other end of the piston body, the liquid flow chamber, the liquid compression chamber, and the elastic gas film is filled with buffer solution.

6. The ankle joint fusion surgery screw placement guide according to claim 5, characterized in that: Both the second and third helical springs are in a compressed state.

7. The ankle joint fusion surgery screw placement guide according to claim 6, characterized in that: The elastic air film is a sheet-like structure made of rubber material with elastic extensibility, and the edge of the sheet-like structure is embedded inside the opening end of the hollow contact shell.

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