Nail placement guider for ankle joint fusion surgery

Abstract

The invention provides an ankle joint fusion surgery screw placement guider, and belongs to the field of medical instruments. Comprising a plurality of elastic abutting type locking mechanisms and a plurality of universal moving type positioning mechanisms. A rectangular frame fixedly installed at the bottom of the longitudinal hollow shell, a longitudinal sliding block capable of moving in the longitudinal direction of the rectangular frame, a rotating ball head installed in the middle of the rectangular frame in a rotatable mode and a positioning hole formed in the rotating ball head and used for positioning the fusion screw are arranged in the longitudinal hollow shell. By means of elastic friction force on the fixed circular ring, the function of circularly moving around the fixed circular ring to change the position can be achieved, under the action of friction resistance, precision deviation of a connecting part is not prone to occurring, and in addition, by means of the spherical hinge principle, the connecting part is more stable. A positioning hole for positioning the fusion set screw can have large-range angle change in a space range, so that the positioning angle range of the fusion set screw is widened.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and more particularly to a nail placement guide for ankle fusion surgery. Background Art

[0002] During the process of ankle fusion screw fixation, it is generally necessary to implant 2-3 hollow screws from different angles to fix the ankle joint. Before inserting the hollow screw, a guide pin needs to be inserted into the patient's ankle joint, and then the hollow screw is put on the guide pin and screwed into the patient's ankle joint, and then the guide pin is pulled out. During the operation, the fusion positioning generally depends entirely on the doctor's experience. The guide pin is often required to be fixed multiple times during the operation to obtain the optimal position. The operation time is long and the trauma is large. At the same time, when fixing, it is necessary to avoid the hollow screws from crossing in the ankle joint cavity, which may lead to failure. Repeated X-ray imaging of the ankle joint is required to determine the angle of hollow screw fixation, which prolongs the operation time, increases radiation, affects the patient's health, and reduces the efficiency of the operation.

[0003] The existing common ankle fusion screw guide has the following two defects during actual surgery: First, the connecting arm is locked to the outer wall of the fixed ring by a locking screw. During the positioning process, the locking screw is prone to displacement of the connecting arm due to the rotation of the screw, resulting in deviations in positioning accuracy; second, the circular hole used to position the fusion screw can only change its angle within a longitudinal plane, resulting in an overly narrow and low adjustment range for the angle of the fusion screw. Summary of the Invention

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

[0005] In order to solve the above problems, the present invention adopts the following technical solutions:

[0006] A nail placement guide for ankle fusion surgery includes a fixed ring that can be fixed to the periphery of the patient's calf, a convex ring structure arranged at the annular end surface of the fixed ring, and a T-shaped ring structure arranged inside the lower annular end of the fixed ring. It also includes a plurality of elastic resistance locking mechanisms, inside which a bottom slide rail that can slide along the T-shaped ring structure is provided, a longitudinal hollow shell that is arranged at the bottom of the bottom slide rail and is hollow inside, a resistance brake rod placed inside the longitudinal hollow shell and locking the spatial position of the longitudinal hollow shell by contacting with the fixed ring, and a first coil spring that exerts an upward elastic force on the resistance brake rod; and a plurality of universal movable positioning mechanisms, inside which a rectangular frame fixedly installed at the bottom of the longitudinal hollow shell, a longitudinal slider that can move longitudinally along 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.

[0007] Optionally, the elastic resistance 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 stuck in the periphery of the T-shaped ring structure and can slide along the periphery of the T-shaped ring structure, the bottom of the longitudinal hollow shell is provided with a first docking plate with an integral structure therewith, 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 connecting the external space and the side of the longitudinal component movable cavity on both symmetrical sides of the longitudinal component movable cavity, and the top of the longitudinal hollow shell is provided with a connecting The first rod body is perforated at the top end of the longitudinal component movable cavity and the bottom end of the concave slide groove, and the longitudinal hollow shell is provided with a built-in movable plate capable of axially moving along the longitudinal component movable cavity inside the longitudinal component movable cavity, and a first coil spring in a compressed state is provided at the bottom of the built-in movable plate, and a resistance brake rod is fixedly installed at the top end of the built-in movable plate, which passes through the first rod body perforation and the bottom end of which abuts against the bottom surface of the T-shaped ring structure, and a horizontal force rod that passes through the longitudinal limit slide groove and can move axially along the longitudinal limit slide groove is fixedly installed on both sides of the built-in movable plate.

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

[0009] Optionally, the universal movable positioning mechanism also includes a first embedding groove and a second embedding groove, the top of the rectangular frame is provided with a second docking plate that is integrally formed with it and fixedly mounted on the bottom end 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 body 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 in a first brake rubber pad whose side abuts against the outside of the side structure of the rectangular frame, 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 area of the spherical cavity, the longitudinal slider is provided with a rotatable rotating ball head placed inside the spherical cavity, the interior of the second embedding groove is embedded with a second brake rubber pad whose inner side abuts against the outer surface of the rotating ball head, and 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 calibers at both ends of the spherical cavity opening are the same and are both smaller than the structural diameter of the rotating ball head.

[0011] Optionally, the friction braking strength of the first brake rubber pad on the rectangular frame and the longitudinal slider is sufficient to keep the rectangular frame and the longitudinal slider stationary when not subjected to external force, and the friction braking strength of the second brake rubber pad on the longitudinal slider and the rotating ball head is sufficient to keep the rotating ball head stationary when not subjected to external force.

[0012] Optionally, it also includes multiple double-helix telescopic clamping mechanisms, which are internally provided with a horizontal hollow shell with a hollow interior and fixedly installed above the convex ring structure, an inner telescopic rod capable of axially moving along the horizontal hollow shell, an elastic air membrane installed at one end of the inner telescopic rod and capable of contacting the patient's calf, and a piston body placed inside the inner telescopic rod and controlling the liquid pressure so that the elastic air membrane contacts the patient's calf under the liquid pressure.

[0013] Optionally, the double-helix telescopic clamping mechanism also includes a second coil spring and a third coil spring, the middle portion of the horizontal hollow shell is provided with a fixed plate structure integral with it, the bottom of the fixed plate structure is provided with an inner concave structure and a fixed groove structure fixedly installed on the outside of the convex ring structure, the interior of the horizontal hollow shell is provided with a horizontal component movable cavity, one end of the horizontal hollow shell is provided with 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 shell is provided with a third rod through-hole connecting the external space and the other end of the horizontal component movable cavity, the horizontal hollow shell is provided with a limiting movable ring capable of axially moving along the horizontal component movable cavity inside the horizontal component movable cavity, the center of the limiting movable ring is provided with The cam is secured to the cam face and is adapted to engage said engaging means and to engage said engaging means to engage said engaging means.

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

[0015] Optionally, the elastic air membrane is a sheet-like structure made of a rubber material with elastic extensibility, and the edge of the sheet-like structure is embedded in the open end of the hollow resistance shell.

[0016] Compared with the prior art, the technical solution provided by the present 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 achieve the circular motion position change function around the fixed ring. Under the action of friction resistance, the connection parts are less likely to have precision deviations. In addition, the ball joint principle is used to make the positioning holes used for positioning fusion nails have a wide range of angle changes within the spatial range, thereby improving the positioning angle range of the fusion nails. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0019] Figure 1 A perspective view of the present invention;

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

[0021] Figure 3 A three-dimensional diagram of the elastic contact locking mechanism of the present invention;

[0022] Figure 4 It is a three-dimensional cross-sectional view of the elastic contact locking mechanism of the present invention;

[0023] Figure 5 A perspective view of the universal movable positioning mechanism of the present invention;

[0024] Figure 6 It is a three-dimensional cross-sectional view of the universal movable positioning mechanism of the present invention;

[0025] Figure 7 A three-dimensional diagram of the double-helix telescopic clamping mechanism of the present invention;

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

[0027] [Reference Signs]

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

[0029] 4. Elastic contact locking mechanism; 41. Longitudinal hollow housing; 42. First docking plate; 43. Bottom slide rail; 44. Concave slide groove; 45. Longitudinal component movable cavity; 46. Longitudinal limit slide groove; 47. First rod body through-hole; 48. Built-in movable plate; 49. Horizontal force rod; 410. First coil spring; 411. Interference brake rod;

[0030] 5. Universal movable 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 shell; 62. Fixed plate structure; 63. Fixed groove structure; 64. Horizontal component movable chamber; 65. Second rod body through-hole; 66. Third rod body through-hole; 67. Position-limiting movable ring; 68. Inner telescopic rod; 69. Force plate; 610. Second coil spring; 611. Liquid flow chamber; 612. Hollow resistance shell; 613. Liquid compression chamber; 614. Third coil spring; 615. Elastic air film; 616. Piston body.

[0032] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments. DETAILED DESCRIPTION

[0033] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. It is also noted that, to provide a more detailed description, the following embodiments are best and preferred embodiments, and those skilled in the art may employ alternative methods for implementing certain known technologies. Furthermore, the accompanying drawings are intended only to provide a more detailed description of the embodiments and are not intended to limit the present invention.

[0034] It should be noted that references in the specification to "one embodiment," "an embodiment," "exemplary embodiments," "some embodiments," etc. indicate that the described embodiments may include specific features, structures, or characteristics, but not necessarily every embodiment will include such specific features, structures, or characteristics. Furthermore, when specific features, structures, or characteristics are described in conjunction with an embodiment, it is within the knowledge of persons skilled in the relevant art to implement such features, structures, or characteristics in conjunction with other embodiments (whether or not explicitly described).

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

[0036] It will be understood that the meanings of “on,” “over,” and “above” in the present invention should be interpreted in the broadest manner, so that “on” means not only “directly on” something but also includes the meaning of being “on” something with intervening features or layers, and “on” or “above” means not only “on” or “above” something but also includes the meaning of being “on” or “above” something with no intervening features or layers.

[0037] Additionally, spatially relative terms such as "below," "beneath," "lower," "above," and "upper" may be used herein for descriptive convenience to describe the relationship of one element or feature to another element or features, as illustrated in the accompanying drawings. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially relative descriptors used herein should be similarly interpreted accordingly.

[0038] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a nail placement guide for ankle fusion surgery, including a fixed ring 1 that can be fixed on the periphery of the patient's calf, a convex ring structure 2 arranged at the upper annular end surface of the fixed ring 1, and a T-shaped ring structure 3 arranged inside the lower annular end of the fixed ring 1. The fixed ring 1 is worn on the patient's calf, and the calf is located in the central area of the fixed ring 1.

[0039] like Figures 1 to 4As shown, in order to achieve the friction-contact braking effect with the fixed ring 1, a plurality of elastic-contact locking mechanisms 4 need to be provided, wherein a bottom slide rail 43 capable of sliding along the T-shaped ring structure 3 is provided inside the mechanism, a longitudinal hollow shell 41 which is provided at the bottom of the bottom slide rail 43 and is hollow inside, a contact brake rod 411 which is placed inside the longitudinal hollow shell 41 and locks the spatial position of the longitudinal hollow shell 41 by contacting the fixed ring 1, and a first coil spring 410 which exerts an upward elastic force on the contact brake rod 411. The torque required for rotation is applied to the bottom slide rail 43. When the torque is greater than the friction force formed by the first coil 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 in space. When it moves to the appropriate position, the longitudinal hollow shell 41 is locked under the elastic action of the first coil spring 410, thereby achieving the friction-contact braking effect with the fixed ring 1.

[0040] like Figure 3 and Figure 4 As shown, the elastic contact locking mechanism 4 also includes a built-in movable plate 48, and the top of the bottom slide rail 43 is provided with a concave slide groove 44 that can be stuck in the periphery of the T-shaped ring structure 3 and can slide along the periphery of the T-shaped ring structure 3. The bottom of the longitudinal hollow shell 41 is provided with a first docking plate 42 with an integral structure therewith, and 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 connecting the external space and the side of the longitudinal component movable cavity 45 on both symmetrical sides of the longitudinal component movable cavity 45, and the top of the longitudinal hollow shell 41 is provided with a groove connecting the top of the longitudinal component movable cavity 45 and the concave slide groove 44. The first rod body through hole 47 at the bottom end, the longitudinal hollow shell 41 is provided with a built-in movable plate 48 capable of axially moving along the longitudinal component movable cavity 45 inside the longitudinal component movable cavity 45, and a first coil spring 410 in a compressed state is placed at the bottom of the built-in movable plate 48, and a resistance brake rod 411 is fixedly installed on the top of the built-in movable plate 48, which passes through the first rod body through hole 47 and the bottom end of which abuts against the bottom surface of the T-shaped ring structure 3, and a horizontal force rod 49 is fixedly installed on both sides of the built-in movable plate 48, which passes through the longitudinal limit slot 46 and can move axially along the longitudinal limit slot 46, and the length of the horizontal force rod 49 is greater than the depth of the first rod body through hole 47.

[0041] like Figure 1 、 Figure 2 、 Figure 5 and Figure 6As shown, in order to realize the control function of the longitudinal height and angle of the positioning hole 510, it is necessary to set up a plurality of universal movable positioning mechanisms 5, which are provided with 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 that is rotatably installed in the middle of the rectangular frame 51, and a positioning hole 510 provided in the rotating ball head 58 and used to position the fusion screw. A longitudinal force is applied to the longitudinal slider 54. When the longitudinal force is greater than the maximum static force formed by the first brake rubber pad 56, the first brake rubber pad 56 is rotated. When friction force is applied, the longitudinal slider 54 will move longitudinally until the longitudinal slider 54 moves to an appropriate 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, so that the positioning hole 510 located at the center of the rotating ball head 58 is aligned with the required installation position of the fusion nail, and the positioning of the positioning hole 510 can be completed. During the operation, the positioning operation of the fusion nail is realized 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 universal movable positioning mechanism 5 also 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 that is an integral structure with it and fixedly installed at the bottom end 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 body of the rectangular frame 51. The longitudinal slider 54 is provided with a first embedding groove 511 on one side of the sleeve structure 55. The longitudinal slider 54 is embedded in a first braking rubber pad 56 whose side is in contact with the outside of the side structure of the rectangular frame 51 in the interior of the first embedding groove 511. A spherical cavity 57 with open ends is provided in the center of the longitudinal slider 54. The longitudinal slider 54 is provided with a second embedding groove 512 on the periphery of the central area of the spherical cavity 57. The second embedded groove 512 is embedded in the second embedded groove 512, and a rotating ball head 58 that can rotate is placed inside the spherical cavity 57 of the longitudinal slider 54. A second brake rubber pad 59 with its inner side in contact with the outer surface of the rotating ball head 58 is embedded in the interior of the second embedded groove 512. A positioning hole 510 with both ends open is set in the center of the rotating ball head 58. The structural radius of the spherical cavity 57 matches the structural radius of the rotating ball head 58, and the diameters of the two ends of the opening of the spherical cavity 57 are the same and are both smaller than the structural diameter of the rotating ball head 58. The friction braking strength of the first brake 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 in a stationary state when not subjected to external force. The friction braking strength of the second brake rubber pad 59 on the longitudinal slider 54 and the rotating ball head 58 is sufficient to keep the rotating ball head 58 in a stationary state when not subjected to external force.

[0043] like Figure 1 、 Figure 2 、 Figure 7 and Figure 8As shown, in order to achieve the clamping and fixing effect on the patient's calf, it is necessary to set up multiple double-helix telescopic clamping mechanisms 6, which are provided with a horizontal hollow shell 61 with a hollow interior and fixedly installed above the convex ring structure 2, an inner telescopic rod 68 that can move axially along the horizontal hollow shell 61, an elastic air film 615 installed at one end of the inner telescopic rod 68 and capable of contacting the patient's calf, and a piston body 616 placed inside the inner telescopic rod 68 and controlling the liquid pressure so that the elastic air film 615 contacts the patient's calf under the liquid pressure, pulling each force plate 69 outward, and then fixing the circular ring. 1 is worn on the patient's calf, and the calf is located in the center area of the fixed ring 1. The tension on each force-applying plate 69 is released. Under the action of the second coil spring 610, the inner telescopic rod 68 moves toward the patient's calf until the elastic air membrane 615 and the hollow abutment shell 612 abut the patient's calf. At this time, the elastic air membrane 615 located near the calf is subjected to the force of the calf and adaptively deforms, so that the elastic air membrane 615 wraps around the abutment part of the calf, thereby reducing the clamping strength per unit area and reducing the pain on the patient's calf, thereby achieving a clamping and fixing effect on the patient's calf.

[0044] like Figure 7 and Figure 8As shown, the double-helical telescopic clamping mechanism 6 also includes a second coil spring 610 and a third coil spring 614. The middle part of the horizontal hollow shell 61 is provided with a fixed plate structure 62 with an integral structure therewith. The bottom of the fixed plate structure 62 is provided with a concave structure and a fixed groove structure 63 fixedly mounted on the outside of the convex ring structure 2. The interior of the horizontal hollow shell 61 is provided with a horizontal component movable cavity 64. One end of the horizontal hollow shell 61 is provided with a second rod connecting the external space and one end of the horizontal component movable cavity 64. The horizontal hollow shell 61 has a third rod through-hole 65, and the other end of the horizontal hollow shell 61 is provided with a third rod through-hole 66 that connects the outside space and the other end of the horizontal component movable cavity 64. The horizontal hollow shell 61 is provided with a limit movable ring 67 that can move axially along the horizontal component movable cavity 64 inside the horizontal component movable cavity 64. The center of the limit movable ring 67 is provided with an inner telescopic rod 68 that is an integral structure with it and passes through the second rod through-hole 65 and the third rod through-hole 66. One end of the limit movable ring 67 is sleeved with a second coil spring 6 10. A hollow abutment shell 612 is fixedly mounted on one end of the inner telescopic rod 68. A liquid compression chamber 613 with an open end is provided inside the hollow abutment shell 612. An elastic air film 615 is fixedly mounted on the open end of the liquid compression chamber 613 of the hollow abutment shell 612. A force plate 69 is fixedly mounted on 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 capable of moving along the liquid flow chamber 613 is placed inside the liquid flow chamber 611. Its axially moving piston body 616 has a third coil spring 614 placed at one end of the piston body 616, and the closed area formed by the other end of the piston body 616, the liquid flow chamber 611, the liquid compression chamber 613 and the elastic air film 615 is filled with a buffer solution, the second coil spring 610 and the third coil spring 614 are both in a compressed state, and the elastic air film 615 is a sheet structure made of rubber material with elastic extensibility, and the edge of the sheet structure is embedded in the open end of the hollow resistance shell 612.

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

[0046] When in use, pull each force plate 69 outward, and then wear the fixed ring 1 on the patient's calf, and make the calf located in the center area of the fixed ring 1, release the pulling force on each force plate 69, and under the action of the second coil spring 610, the inner telescopic rod 68 will move toward the patient's calf until the elastic air film 615 and the hollow interference shell 612 are in contact with the patient's calf. At this time, the elastic air film 615 located near the calf is subjected to the force of the calf and will undergo adaptive deformation, so that the elastic air film 615 is wrapped around the calf interference part, applying the torque required for rotation to the bottom slide rail 43. When the torque is greater than the friction force formed by the first coil spring 410 on the interference brake rod 411 and the T-shaped ring structure 3, the bottom slide rail 43 will drive the longitudinal hollow shell 41 to move in space. When it moves to the appropriate When the longitudinal slider 54 is in the correct position, the elastic action of the first coil spring 410 causes the longitudinal hollow shell 41 to obtain a locking effect, and a longitudinal force is applied to the longitudinal slider 54. When the force is greater than the maximum static friction force formed by the first brake rubber pad 56, the longitudinal slider 54 will move longitudinally until the longitudinal slider 54 moves to a suitable height. Then, a torsional force is applied to the rotating ball head 58. When the torsional force is greater than the maximum static friction force formed by the second brake rubber pad 59, the rotating ball head 58 will rotate, so that the positioning hole 510 located at the center of the rotating ball head 58 is aligned with the required installation position of the fusion nail, and the positioning of the positioning hole 510 can be completed. During the operation, the positioning operation of the fusion nail is realized through the positioning hole 510, thereby realizing the control function of the longitudinal height and angle of the positioning hole 510.

[0047] The present invention encompasses any alternatives, modifications, equivalents, and solutions that fall within the spirit and scope of the present invention. To provide a thorough understanding of the present invention, specific details are described in detail below in connection with the preferred embodiments of the present invention, but those skilled in the art will be able to fully understand the present invention without these detailed descriptions. Furthermore, to avoid unnecessary confusion regarding the essence of the present invention, well-known methods, processes, procedures, components, and circuits have not been described in detail.

[0048] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A guide for placing a nail for ankle fusion surgery, comprising a fixed ring capable of being fixed to the periphery of a patient's lower leg, a convex ring structure disposed at the upper annular end surface of the fixed ring, and a T-shaped ring structure disposed within the lower annular end of the fixed ring, characterized in that: Also includes, Multiple elastic contact locking mechanisms, each internally provided with a bottom rail capable of sliding along a T-shaped ring structure, a longitudinal hollow shell disposed at the bottom of the bottom rail and having a hollow interior, a contact brake rod disposed within the longitudinal hollow shell and locking the longitudinal hollow shell in position by contact with a fixed circular ring, and a first coil spring exerting an upward elastic force on the contact brake rod; And multiple universal movable positioning mechanisms, each of which is provided with a rectangular frame fixedly installed at the bottom of the longitudinal hollow shell, a longitudinal slider that can move longitudinally along the rectangular frame, a rotating ball head installed in the middle of the rectangular frame in a rotatable manner, and a positioning hole provided in the rotating ball head for positioning the fusion screw.

2. The nail placement guide for ankle fusion surgery according to claim 1, characterized in that: The elastic resistance 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 stuck in the periphery of the T-shaped ring structure and can slide along the periphery of the T-shaped ring structure, the bottom of the longitudinal hollow shell is provided with a first docking plate with its integral structure, 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 connecting the external space and the side of the longitudinal component movable cavity on both symmetrical sides of the longitudinal component movable cavity, and the top of the longitudinal hollow shell is provided with a longitudinal limit slide groove connecting the longitudinal component movable cavity The first rod body is perforated at the top of the component movable cavity and the bottom of the concave slide groove, and the longitudinal hollow shell is provided with a built-in movable plate that can move axially along the longitudinal component movable cavity inside the longitudinal component movable cavity, and a first coil spring in a compressed state is placed at the bottom of the built-in movable plate, and a resistance brake rod that passes through the first rod body perforation and the bottom end of which abuts against the bottom surface of the T-shaped ring structure is fixedly installed at the top of the built-in movable plate, and a horizontal force rod that passes through the longitudinal limit slide groove and can move axially along the longitudinal limit slide groove is fixedly installed on both sides of the built-in movable plate.

3. The nail placement guide for ankle fusion surgery according to claim 2, characterized in that: The length of the horizontal force-applying rod is greater than the depth of the through hole of the first rod body.

4. The nail placement guide for ankle fusion surgery according to claim 3, characterized in that: The universal movable positioning mechanism also 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 mounted on the bottom end 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 body 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 in a first brake rubber pad whose side abuts against the outside of the side structure of the rectangular frame, 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 central area of the spherical cavity, the longitudinal slider is provided with a rotatable rotating ball head placed inside the spherical cavity, the interior of the second embedding groove is embedded with a second brake rubber pad whose inner side abuts against the outer surface of the rotating ball head, and the center of the rotating ball head is provided with a positioning hole with open ends.

5. The nail placement guide for ankle fusion surgery according to claim 4, characterized in that: The structural radius of the spherical cavity matches the structural radius of the rotating ball head, and the diameters of the two ends of the spherical cavity opening are the same and are both smaller than the structural diameter of the rotating ball head.

6. The nail placement guide for ankle fusion surgery according to claim 5, characterized in that: The friction braking strength of the first brake rubber pad on the rectangular frame and the longitudinal slider is sufficient to keep the rectangular frame and the longitudinal slider stationary when not subjected to external force, and the friction braking strength of the second brake rubber pad on the longitudinal slider and the rotating ball head is sufficient to keep the rotating ball head stationary when not subjected to external force.

7. The nail placement guide for ankle fusion surgery according to any one of claims 1 to 6, characterized in that: It also includes multiple double-helix telescopic clamping mechanisms, which are internally provided with a horizontal hollow outer shell with a hollow interior and fixedly installed above the convex ring structure, an inner telescopic rod that can move axially along the horizontal hollow outer shell, an elastic air membrane installed at one end of the inner telescopic rod and capable of contacting the patient's calf, and a piston body placed inside the inner telescopic rod and controlling the liquid pressure so that the elastic air membrane contacts the patient's calf under the liquid pressure.

8. The nail placement guide for ankle fusion surgery according to claim 7, characterized in that: The double-helix telescopic clamping mechanism also includes a second coil spring and a third coil spring, the middle portion of the horizontal hollow shell is provided with a fixed plate structure integral with it, the bottom of the fixed plate structure is provided with an inwardly concave structure and a fixed groove structure fixedly installed on the outside of the convex ring structure, the interior of the horizontal hollow shell is provided with a horizontal component movable cavity, one end of the horizontal hollow shell is provided with 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 shell is provided with a third rod through-hole connecting the external space and the other end of the horizontal component movable cavity, the horizontal hollow shell is provided with a limiting movable ring capable of axially moving along the horizontal component movable cavity, the center of the limiting movable ring is provided with a through-hole connecting it to the horizontal component movable cavity. The cam is secured to the cam face and is adapted to engage said engaging means and to engage said engaging means to engage said engaging means.

9. The nail placement guide for ankle fusion surgery according to claim 8, characterized in that: The second coil spring and the third coil spring are both in a compressed state.

10. The nail placement guide for ankle fusion surgery according to claim 9, characterized in that: The elastic air membrane is a sheet-like structure made of a rubber material with elastic extensibility, and the edge of the sheet-like structure is embedded in the open end of the hollow abutment shell.

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