CN209360877U - A kind of ankle fusion sets nail guider - Google Patents

Abstract

The utility model discloses a nail guider for fusion of ankle joints, which belongs to the technical field of medical instruments. The nail guider for ankle joint fusion of the utility model includes a guide ring, a fixer, a movable rod, a nail guide sleeve and a nail locator; The adjustment and positioning of the guide can obtain the best screw placement position and angle, which is convenient and quick to operate and has high accuracy, which can effectively shorten the time of surgical screw placement; at the same time, it can also effectively prevent the fixation screw from being stuck in place when the screw is implanted efficiently and quickly. The intracavitary crossing of the ankle leads to failure, and does not require multiple radiation imaging, which greatly shortens the operation time and improves the operation efficiency; it is beneficial to the health of medical staff.

Description

An ankle joint fusion nail guide

technical field

The utility model relates to the technical field of medical devices, in particular to a nail guider for fusion of ankle joints.

Background technique

The ankle joint is the closest weight-bearing joint to the ground in the human body, and it is also the joint that bears the most weight in the whole body. It is the hub between the foot and the lower leg, so its function is extremely important. It is the most important joint for stabilizing the human body and maintaining balance during walking and running, and even jumping. At the same time, it is not as thick as the knee joint and hip joint and lacks muscle protection, so it has become the joint most likely to be injured in the human body. The ankle joint is composed of the tibia, fibula and talus. Among the joint and ligament injuries, the incidence of ankle joint injury is the highest. Its main functions are dorsiflexion and plantarflexion, and it also has a certain rotation function. Ankle joint sprains, fractures caused by violence, and multiple previous surgical injuries destroy the ligament and articular cartilage structure of the ankle joint to a certain extent, thus destroying the normal anatomical correspondence of the ankle joint and reducing the stability of the ankle joint. Sex, these are important factors leading to ankle traumatic arthritis. Traumatic arthritis of the ankle joint causes symptoms such as pain when walking or bearing weight, which seriously affects the quality of life of patients, and conservative treatment is difficult to achieve satisfactory results.

At present, the commonly used method is ankle joint fusion treatment, which has good effect and can quickly achieve the purpose of relieving symptoms, which is accepted by most patients. Factors affecting the effect of ankle joint fusion mainly include the method of surgical fixation, the choice of surgical approach, the method of fixation, the area of fusion, and whether bone grafting is sufficient. The choice of surgical fixation method is one of the key factors for the success of ankle joint fusion. The fixation methods of ankle joint fusion include compression screw internal fixation, plate internal fixation, intramedullary nail fixation and external fixation bracket fixation. Internal fixation with steel plates can achieve a strong and stable fusion of the ankle joint, but the tissue damage is greater, the risk of vascular and nerve injury is greater, and there are more postoperative complications. Intramedullary nail fixation is more in line with the principles of biomechanics. Interlocking nails can play an anti-torsion effect. The fixation is more stable and reliable, with less damage to surrounding soft tissues and fewer postoperative complications, but the operation is relatively more difficult. Ankle joint fusion external fixation is commonly used in clinical practice as Ilizarov ring external fixation, which can be adjusted at any time according to the patient's condition to adjust the angle, shift, deformity correction, stable fixation, and sufficient anti-bending and anti-torsion force , can also play the role of continuous pressure. For skin tension, soft tissue scars, and Achilles tendon contracture, minimally invasive stretching can be performed at the same time. For patients with acute osteoarthritis and joint infection, external fixation is a good choice, but it is easy to lead to increased bone nonunion rate and screw path. Infection and ankylosis of the adjacent joints, and the inconvenience caused by the external fixator to the life of patients after operation also affected its use in ankle arthrodesis to a certain extent. In recent years, minimally invasive treatment has been increasingly used in clinical treatment, and there are many methods, and screw internal fixation has also become the preferred surgical method in clinical practice. According to literature reports, the fusion rate of screw internal fixation is higher than 90%. And it has the advantages of small incision, simple operation, high stability and few complications.

In the current internal fixation process of ankle joint fusion screws, it is generally necessary to implant 2-3 screws from different angles to fix the ankle joint. During the operation, the fusion positioning is generally based on the experience of the doctor, and many guide pins are often required during the operation. Second fixation is required to obtain the best position, the operation time is long, and the trauma is large; at the same time, it is necessary to avoid the failure of the fixation screw crossing in the ankle joint cavity during fixation, and repeated radiographic imaging of the ankle joint is required to determine the angle of screw fixation, resulting in long operation time. Extended, increased radiation, affecting the health of patients and medical staff, reducing the efficiency of surgery; at present, there is no guider for ankle fusion nails at home and abroad.

Utility model content

The purpose of this utility model is to provide a guider for placing nails in ankle joint fusion. During the internal fixation operation of ankle joint fusion screws, the fixation screws can be stably and effectively fixed on the fused ankle joint through the guider. It can achieve effective positioning and avoid internal crossing of nails. Its structure design is reasonable, the operation is fast and efficient, and the operation efficiency is effectively improved.

In order to achieve the above-mentioned technical purpose and achieve the above-mentioned technical effect, the utility model is realized through the following technical solutions:

A nail guide for ankle joint fusion, including a guide ring, a fixer, a movable rod, a guide sleeve for nail placement, and a nail positioner; the guide ring is provided with 3 fixers and 3 movable rods evenly distributed, and the movable There is a movable base on the rod, and a nail-setting guide sleeve is arranged on the movable base; a detachable nail-setting locator is arranged on the nail-setting guide sleeve;

The guide ring is made of medical stainless steel, the guide ring is provided with an opening with a length of 3-4cm, the axial center position of the guide ring on the opposite side of the opening and the opening is provided with a fixer screw hole, and the upper and lower sides of the guide ring are provided with indentations arc chute;

The movable rod is a square rod, and the upper end of the movable rod is an installation seat that can be stuck on the arc-shaped chute, and the movable rod is provided with a movable base that can slide on the rod; a dial is fixedly installed on the movable base, There is a dial screw hole at the center of the dial;

The movable base is provided with locking bolts, the surface of the movable rod corresponding to the locking thread is provided with an indented card slot, and the outer surface of the movable rod is provided with scale lines, and scale marks are provided from top to bottom;

The nail setting guide sleeve is a hollow sleeve, a screw rod is set at the middle position on the upper side to mesh with the dial screw hole, a lock nut is provided on the screw rod, and an angle positioning mark is set at the front end of the upper side; the nail setting guide sleeve is provided on the lower side. There is a detachable nail positioner;

The nail setting locator includes an arc-shaped handle and an adjustable positioning handle. The positioning end of the positioning handle is the pointing end of the nail setting guide sleeve; the nail guiding sleeve and the nail setting locator are always on the same plane.

Further, the diameter of the guide ring is 10-15 cm, the opening is round, and there is a mounting groove for mounting a card seat at a position 1 cm behind the opening end, and a locking bolt is provided on the mounting card seat.

Further, the fixer includes an adjustment knob at the rear end, a threaded rod at the middle position, and a detachable fixed end at the front end, and the fixed end is an arc-shaped latex pad.

Further, the length of the movable rod is 5-6cm, the movable base is provided on the movable rod, and the dial of the movable base is provided with uniformly spaced angle marks.

Further, a square connecting groove is provided on the opposite side of the screw end of the nail setting guide sleeve to connect with a square connecting tenon provided on the nail setting positioner.

Another purpose of the present utility model is to provide a method of operating the nail guide for ankle joint fusion. Three movable rods are installed on the arc-shaped chute of the guide ring through the mounting bracket, and the opening end of the guide ring is opposite to the other side. The screw hole of the fixer is used as a reference, so that one movable rod is on its left side, and the other two movable rods are on its right side; by passing the threaded rod of the fixer through the screw hole of the fixer and connecting the fixed end, the guide ring passes through the opening position Put the upper end of the ankle joint in the guide ring, and fix the guide ring at the position of 3-5cm above the ankle joint by the fixed end of the fixer; the movable base on the movable rod is fixed with a dial, and the dial is connected by a screw to place a nail The guide sleeve, under the locking of the lock nut, the angle positioning mark of the nail setting guide sleeve coincides with the 0° angle mark on the dial; the opposite side of the screw rod on the nail setting guide sleeve is connected with a nail positioning At this time, the nail positioner, guide sleeve and movable base are on the same plane; properly adjust the positions of the movable rod and the movable base, and adjust the angle of the guide sleeve and the nail positioner to place the first The hollow screw is implanted into the ankle joint, and the implanted angle and position can be controlled by the nail positioner and the guide sleeve; after that, the nail positioner is disassembled and installed on the guide sleeves of the remaining two movable rods for guiding and positioning and implanted cannulated screws; when implanting the second and third cannulated screws, in order to prevent internal crossover, when the initial position of implantation is higher than that of the implanted screws, the arc of implantation is controlled to be smaller than that of the implanted screws. Conversely, when the initial position of implantation is lower than that of the implanted screw, the implanted arc is controlled to be larger than the arc of the implanted screw.

The beneficial effect of the utility model is that: the ankle joint fusion nail guide of the utility model includes a guide ring, a fixer, a movable rod, a nail guide sleeve and a nail locator; the guide ring is provided with evenly distributed 3 A fixer and 3 movable rods, the movable base is provided with a movable base, the movable base is provided with a dial and is connected with the nail setting guide sleeve through a screw, and the nail setting guide sleeve is provided with a detachable nail setting guide When fixing the ankle joint fusion screw, the best position and angle of the screw can be obtained through the adjustment and positioning of the screw guide sleeve and the screw guide, and the first hollow screw is implanted into the ankle joint, which is convenient and quick to operate. The accuracy is high, which can effectively shorten the time of surgical nail placement; after that, the best nail placement position and angle can be obtained through the adjustment and positioning of the remaining nail placement guide sleeve and the nail placement guide, and the second and second nail placement can be implanted. For three cannulated screws, in order to prevent internal crossover, the initial position of implantation is higher than that of the implanted screw, and the arc of implantation is controlled to be smaller than that of the implanted screw; otherwise, the initial position of implantation is lower When the screw has been implanted, the arc of its implantation is controlled to be larger than the arc of the implanted screw; that is, when the screw is implanted efficiently and quickly, it can also effectively avoid the failure of the fixation screw crossing in the ankle joint cavity, and there is no need to Radiation imaging is performed many times, which greatly shortens the operation time and improves the operation efficiency; it is beneficial to the health of medical staff.

Of course, any product implementing the present utility model does not necessarily need to achieve all the above-mentioned advantages at the same time.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

Fig. 1 is the structural representation of the guider for placing nails in ankle joint fusion described in the present invention;

Fig. 2 is the structural representation of guide ring and fixator described in the utility model;

Fig. 3 is a structural schematic diagram of the movable rod and the movable base of the utility model;

Fig. 4 is the structural representation of movable base and dial described in the utility model;

Fig. 5 is a schematic structural view of the nail setting guide sleeve and the nail setting guide described in the present invention;

In the accompanying drawings, the list of parts represented by each label is as follows:

1-Guide ring, 101-open end, 102-fixer screw hole, 103-arc chute, 104-installation groove, 2-fixer, 201-adjusting knob, 202-threaded rod, 203-fixed end, 3 -Active rod, 301-Installation card seat, 302-Inset card slot, 303-Graduation line, 4-Nail guide sleeve, 401-Lock nut, 402-Angle positioning mark, 403-Square connecting groove, 404-Screw , 5-nail locator, 501-hand handle, 502-positioning handle, 503-positioning end, 504-square tenon, 6-movable base, 601-dial, 602-angle mark, 603-dial screw hole.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

Example 1

As shown in Figures 1-5, a nail guide for ankle joint fusion includes a guide ring 1, a fixator 2, a movable rod 3, a nail guide sleeve 4, and a nail positioner 5; the guide ring 1 is provided with The fixer 2 and the movable rod 3, the movable rod 3 is provided with a movable base 6, the movable base 6 is provided with a nail setting guide sleeve 4; the nail setting guide sleeve 4 is provided with a detachable nail positioning device ;

The guide ring 1 is made of medical stainless steel. The guide ring 1 is provided with an opening with a length of 3-4 cm. The opening end 101 and the guide ring 1 on the opposite side of the opening are provided with a fixer screw hole 102 at the axial center of the guide ring 1. The upper and lower sides of the guide ring 1 An inset arc-shaped chute 103 is provided for connecting with the movable rod;

Movable bar 3 is a square bar, and the movable bar 3 upper end is the installation bay 301 that can be stuck on the arc chute 103, and the movable bar 3 is provided with the movable base 6 that can slide on the bar; Fixed on the movable base 6 Dial 601 is installed, and the center position of dial 601 is provided with dial screw hole 603 and is used for being connected with guide sleeve 4 of setting nail; Movable base 6 is provided with locking bolt, and the surface of movable rod 3 corresponding with locking bolt is provided with. There is an inset slot 302, and the outer surface of the movable rod 3 is provided with a scale line 303, and a scale mark is provided from top to bottom for identifying the mutual position distance of the movable base 6 relative to the guide ring 1;

Movable bar 3 length is 5-6cm, and movable base 6 is set on movable bar 3, and the dial 601 of movable base 6 is provided with the angle sign 602 of uniform interval;

The nail setting guide sleeve 4 is a hollow sleeve, and the upper middle position is provided with a screw rod 404 engaged with the dial screw hole 603. The screw rod 404 is provided with a locking nut 401, and the upper front end position is provided with an angle positioning mark 402. After passing through the screw rod 404 After being connected with the dial 601, the angle of the nail setting guide sleeve 4 can be rotated to adjust the angle of the nail setting, and can be locked by the locking nut 401; the lower side of the nail setting guide sleeve 4 is provided with a detachable set Nail Locator 5;

The nail setting locator 5 includes an arc-shaped handle 501 and an adjustable positioning handle 502. The positioning end 503 of the positioning handle 502 is the pointing end of the nail setting guide sleeve 4; After the square connecting groove 403 provided on the side is connected with the square connecting tenon 504 provided on the nail setting locator 5, the nail setting guide sleeve 4 and the nail setting locator 5 are always on the same plane, and the front end of the nail setting guide sleeve 4 points to the positioning handle 502 The positioning end 503 of the positioning handle 502, that is, the positioning end 503 from the positioning handle 502 is the front end pointing end of the screw passing through the nail guide sleeve 4;

The diameter of the guide ring 1 is 10-15 cm, the opening is round, and the position 1 cm behind the opening end 101 is provided with a mounting groove 104 for installing the card holder 301, and the installation card holder 301 is provided with a locking bolt for stably fixing the movable rod 3 and the guide ring 1 ;

The fixator 2 includes an adjustment knob 201 at the rear end, a threaded rod 202 at the middle position, and a detachable fixed end 203 at the front end. The fixed end 203 is an arc-shaped latex pad; The adjustment knob 201 of 2 and the threaded rod 202 in the middle position will abut the fixed end 203 against the upper end of the ankle joint so that the guide ring is stably fixed at the position 3-5 cm above the ankle joint.

Example 2

As shown in Figures 1-5, a nail guide for ankle joint fusion, its structure and the interconnection of each part are as described in the above-mentioned embodiment 1; The card seat 301 is installed on the arc-shaped chute 103 of the guide ring 1, taking the fixer screw hole 102 on the opposite side of the open end 101 of the guide ring 1 as a reference, so that one movable rod 3 is on its left side, and the other two movable rods are on the left side. The rod 3 is on its right side; by passing the threaded rod of the fixer 2 through the screw hole 102 of the fixer and connecting the fixed end 203, the guide ring 1 puts the upper end of the ankle joint in the guide ring 1 through the opening position, and the The fixed end 203 fixes the guide ring 1 on the 3-5cm position on the ankle joint. At this time, the opening position of the guide ring 1 is located at the front side of the ankle joint; After the screw rod 404 is connected with the dial 601, the angle of the nail setting guide sleeve 4 can be rotated to adjust the angle of the nail setting, and can be locked by the locking nut 401, and the angle positioning mark 402 of the nail setting guide sleeve 4 is aligned with The angle mark 602 of 0° on the dial 601 coincides; the opposite side of the screw rod 404 on the nail guide sleeve 4 is connected with the nail locator 5 through the square connecting groove 403. At this time, the nail locator 5 and the nail guide sleeve The barrel 4 and the movable base 6 are on the same plane;

When placing screws in the ankle joint for fusion, first properly adjust the movable rod 3 and the movable base 6 on the right side of the fixator screw hole 102 to determine the starting point for implanting the first hollow screw. The rod 3 and the movable base 6 are stably fixed, and then the nail setting positioner 5 is connected with the nail setting guide sleeve 4, and the angle of the nail setting guide sleeve 4 is adjusted by rotating with the assistance of the nail setting positioner 5: that is, the nail setting The positioning handle 502 of the positioner 5 can be adjusted to elongate. By rotating the nail setting guide sleeve 4, the handle 501 of the nail setting positioner 5 rotates accordingly, and the front end of the nail setting guide sleeve 4 points to the positioning end 503 of the positioning handle 502. Determine the angle of the first hollow screw, and then lock the nail positioning sleeve 4 through the locking nut 401; drive the steel needle through the nail positioning sleeve 4 to implant the first hollow screw; the first hollow screw After the screw is driven in, the distance between the movable base 6 driven into by the first hollow screw and the guide ring 1 and the angle of the nail guide sleeve 4 relative to the dial 601 can be determined (after the nail guide sleeve 4 rotates counterclockwise, The angle positioning mark 402 of the nail guide sleeve 4 will point to the scale mark 602 on the dial 601 to determine the rotation angle); afterward, the nail positioning device 5 is disassembled and installed on the nail guides of the remaining two movable rods 3 on sleeve 4; repeat the above operation method to implant the remaining two cannulated screws; when implanting the second and third cannulated screws, in order to prevent internal crossover, the starting position of implanted cannulated screws is higher than that of the implanted cannulated screws. When the screw is inserted, the arc of its implantation is controlled to be smaller than that of the implanted screw. On the contrary, when the initial position of implantation is lower than that of the implanted screw, the arc of its implantation is controlled to be greater than that of the implanted screw. radian; the utility model obtains the best nail position and angle through the adjustment and positioning of the nail guide sleeve 4 and the nail guide 5 when the ankle joint fusion is fixed, and implants the first hollow screw into the ankle joint , the operation is convenient and fast, and the accuracy is high, which can effectively shorten the time for surgical nail placement; after that, the best nail placement position and angle can be obtained through the adjustment and positioning of the remaining nail placement guide sleeve 4 and nail placement guide 5, That is to say, when the screws are implanted efficiently and quickly, it can also effectively avoid the failure caused by the crossing of the fixing screws in the ankle joint cavity, and does not require multiple radiation imaging, which greatly shortens the operation time and improves the operation efficiency; it is beneficial to the health of medical staff.

Example 3

As shown in Figures 1-5, a nail guide for ankle joint fusion. On the basis of the operation method described in Embodiment 1 and Embodiment 2, when the specific ankle joint is placed and fused, the opening of the guide ring 1 is located at the ankle joint. On the front side of the ankle joint, the guide ring is about 4cm above the ankle joint. Adjust the movable rod 3 and the movable base 6 on the right side of the fixator screw hole 102 to determine the starting point for implanting the first hollow screw. The first hollow screw (a hollow screw with a diameter of 7 mm and a length of 55 mm) was implanted at the tibial end on the posterior side of the joint, and then the movable rod 3 and the movable base 6 were stably fixed, and adjusted by rotation with the assistance of the nail positioner 5 The angle of the nail-setting guide sleeve 4: the angle of nail-setting is determined by the positioning handle 502 and the positioning end 503 of the nail-setting locator 5 and the nail-setting guide sleeve 4. Generally, the implantation point needs to be from the rear tibia to reach the foot. Navicular bone; (specifically, it can be selected and determined according to the actual operation, and the angle and direction of the nail placement are not limited, as long as the ankle joint can be fixed); after the angle is determined, the nail positioning sleeve is fixed by the locking nut 401 after confirmation. 4 to lock; the steel needle is driven into the first hollow screw by the nail positioning sleeve 4 to implant the first hollow screw; after the first hollow screw is driven in, the movable base 6 driven into the first hollow screw and the guide ring 1 Both the distance of the nail guide sleeve 4 and the angle of the dial 601 relative to the dial 601 can be determined; after that, the nail positioning device 5 is disassembled and installed on the nail guide sleeves 4 of the remaining two movable rods 3; the above operation method is repeated Insert the remaining two cannulated screws (one with a diameter of 5.5 mm and a length of 35 mm; the other with a diameter of 5.5 mm and a length of 45 mm); when implanting the second and third cannulated screws, in order to prevent internal crossing, implant When the initial position of the hollow screw is higher than that of the implanted screw, the arc of its implantation is controlled to be smaller than that of the implanted screw; The radian is controlled to be greater than the radian of the implanted screw (that is, when the second hollow screw is implanted, if the implantation starting point is below the starting point of the first hollow point, the implantation angle needs to be selected during the selection process. Select smaller than the angle of the first hollow point); the utility model obtains the best nail position and angle through the adjustment and positioning of the nail guide sleeve 4 and the nail guide 5 when the ankle joint is fused and fixed. The first hollow screw is implanted into the ankle joint, which is convenient and quick to operate and has high accuracy, which can effectively shorten the time of surgical screw placement; after that, it can be obtained through the adjustment and positioning of the rest of the nail placement guide sleeve 4 and the nail placement guide 5. The optimal position and angle of screw placement, that is, when the screws are implanted efficiently and quickly, can also effectively avoid the failure of the fixation screws crossing in the ankle joint cavity, and do not need multiple radiation imaging, which greatly shortens the operation time and improves the operation efficiency. Efficiency; beneficial to the health of medical staff.

In the description of this specification, descriptions referring to the terms "one embodiment", "example", "specific example" and the like mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in the description of the present invention. In at least one embodiment or example. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not exhaust all details, nor do they limit the utility model to the specific implementations described. Obviously, many modifications and variations can be made based on the contents of this specification. This specification selects and specifically describes these embodiments in order to better explain the principle and practical application of the utility model, so that those skilled in the art can well understand and utilize the utility model. The invention is to be limited only by the claims and their full scope and equivalents.

Claims (5)

1. a kind of ankle fusion sets nail guider, it is characterised in that: including guide ring, fixator, motion bar, set nail guide sleeve Cylinder and set nail positioner；Guide ring is equipped with equally distributed 3 fixators and 3 motion bars, and motion bar is equipped with movable base Seat, movable base are equipped with and set nail pilot sleeve；It sets nail pilot sleeve and sets nail positioner equipped with dismountable；

The guide ring is medical stainless steel material, and guide ring is equipped with the opening that length is 3-4cm, open end and opening opposite side Guide ring axial centre position be equipped with fixator screw hole, guide ring upper and lower sides be equipped with invagination arc chute；

The motion bar is square pole, and motion bar upper end is the installed cassette that can be stuck on arc chute, and motion bar is equipped with The movable base that can be slided on bar；Dial is fixedly installed on movable base, dial center is equipped with scale valve snail Hole；

Movable base is equipped with locking bolt, and the surface of motion bar corresponding with locking screw thread is equipped with invagination card slot, outside motion bar The surface of side is equipped with graduation mark, is equipped with scale marker from top to bottom；

The nail pilot sleeve of setting is cannulated sleeve, and upside middle position is arranged screw rod and engages connection, screw rod with dial screw hole It is equipped with lock nut, angle positioning identifier is arranged in upper front end position；It sets to be equipped on the downside of nail pilot sleeve and removably sets nail Locator；

Described to set the hand holding handle and adjustable positioning handle that nail positioner includes arc, the positioning end of positioning handle is to set nail guiding Sleeve is directed toward end；It the nail pilot sleeve and sets nail positioner and is constantly in same plane.

2. a kind of ankle fusion as described in claim 1 sets nail guider, it is characterised in that: the guiding ring diameter is 10-15cm is open mellow and full, and the position 1cm is equipped with the mounting groove of installed cassette behind open end, and installed cassette is equipped with locking bolt.

3. a kind of ankle fusion as described in claim 1 sets nail guider, it is characterised in that: the fixator includes rear end Adjusting knob, middle position the dismountable fixing end of threaded rod and front end, fixing end be arc-shaped latex mattress.

4. a kind of ankle fusion as described in claim 1 sets nail guider, it is characterised in that: the activity pole length is 5- 6cm, movable base is arranged on motion bar, and the dial of movable base is identified equipped with evenly spaced angle.

5. a kind of ankle fusion as described in claim 1 sets nail guider, it is characterised in that: described to set on nail pilot sleeve The opposite side at screw rod end be arranged rectangular connecting groove with set be arranged on nail positioner rectangular and be connected feather joint.