CN115137422A - Percutaneous installation axial distraction system for assisting calcaneus fracture minimally invasive surgery - Google Patents

Abstract

The invention discloses a percutaneous-mounted axial distraction system for assisting minimally invasive calcaneal fracture surgery, which comprises a distraction needle and two sets of distraction components, wherein any one distraction component comprises a fixed stay bar, a connecting rod, a movable stay bar and a rotating handle, one end of the fixed stay bar is provided with a fixed stay bar hole capable of being sleeved with the distraction needle, the other end of the fixed stay bar is fixedly connected with one end of the connecting rod, one end of the movable stay bar is provided with a movable stay bar hole capable of being sleeved with the distraction needle, the other end of the movable stay bar is in sliding connection with the connecting rod in a non-relative-rotating mode, and the rotating handle rotates to drive the movable stay bar to be far away from the fixed stay bar. The invention realizes and maintains the distraction of the fracture end by mechanically drawing the movable stay bar away from the fixed stay bar by utilizing the principle of acting force and reacting force; the movable stay bar and the connecting rod are in sliding connection in a mode of non-relative rotation, so that the overall stability is high; the invention has simple structure, convenient and simple installation and minimal invasion, simple operation and strong distraction force, and can greatly improve the effect and efficiency of the calcaneus fracture minimal invasion operation.

Description

Percutaneous installation axial distraction system for assisting calcaneus fracture minimally invasive surgery

Technical Field

The invention relates to the field of medical instruments, in particular to an axial distraction system for assisting a minimally invasive calcaneus fracture operation through percutaneous installation and a using method thereof.

Background

Calcaneus fracture is mostly caused by high-energy violence such as traffic accidents or high fall injuries, deformity such as calcaneus shortening, widening, height loss and inversion often occurs after fracture, and meanwhile, the injured soft tissues around the affected foot are also serious, and the operation treatment is often needed. In the operation treatment, the main purposes are to recover the shape (length, width and height) and the hind foot line of the calcaneus, correct the inversion deformity of the calcaneus, recover the flatness of the anterior, middle and posterior subtalar joint surfaces of the calcaneus and match the calcaneus joint and provide firm internal fixation.

Although the traditional operation can achieve the purpose of the operation, the incision reduction internal fixation operation is adopted for treatment, the incision complication is high, the operation wound is large, much blood is lost during the operation, and the postoperative recovery is slow. Such procedures have become increasingly alternatives. In order to avoid complications of open surgery, orthopedists began exploring minimally invasive surgical protocols. The percutaneous prying reduction percutaneous implantation screw internal fixation is used as a pure closed minimally invasive surgery technology for treating calcaneal fracture, has the advantages of small surgical wound, low soft tissue complications, quick recovery of patients and the like, and is widely developed at home and abroad in recent years.

The operation method firstly solves the problems that the fractured end of the calcaneus is retracted according to the axis of the calcaneus so as to preliminarily restore the shape of the calcaneus, the original space of the fractured end of the calcaneus is restored at the same time, then the fractured block of the inferior articular surface after the reduction is pried and pried through skin so as to restore the flatness and the matching of the articular surface, and finally, the fracture is firmly fixed through a skin screw while the reduction state is continuously maintained. The conventional method for retracting the broken end of the calcaneus fracture is to transversely penetrate a kirschner wire through a tuberosity behind the calcaneus and pull the broken end of the calcaneus fracture open by means of manual counter traction, but the retracting strength of the method is limited and is difficult to maintain continuously. Therefore, it is very difficult and impossible to achieve the closure and distraction of the fractured ends of the calcaneus without good instrument assistance and to maintain the sustained distraction state.

The existing calcaneus distractor widely used in clinical practice has few varieties, and a plurality of hospitals still use the cervical vertebra distractor for replacement. The distracter can not be distracted along the calcaneus axis, has small distraction force, and can not achieve good distraction effect for most parts, thereby affecting the reduction quality and the operation effect.

Chinese patent CN210749442U discloses a retractor for treating calcaneus fracture, which comprises two retracting needles, a left retracting auxiliary device and a right retracting auxiliary device which are arranged on two sides of the calcaneus, wherein the left retracting auxiliary device and the right retracting auxiliary device are identical in structure, the left retracting auxiliary device comprises two parallel first stretching arms, a first guide rod which is arranged between the two parallel first stretching arms and is slidably connected with the two first stretching arms, and a first adjusting piece which is used for adjusting the distance between the two first stretching arms, one end of each retracting needle is fixedly connected with one end of the first stretching arm, and the other end of each retracting needle penetrates through the calcaneus and is fixedly connected with a second stretching arm corresponding to the right retracting auxiliary device. Although the retractor has a certain retracting function, the following problems exist:

1. the retraction auxiliary device adopts a layout mode that a circular wire lever is matched with two circular guide rods, so that the overall stability is low, and the relative opening arms are easy to rotate and deflect;

2. the driving parts of the spreader are rotating discs on the left side and the right side, no special driving tool (such as a handle or a opener) is designed, the spreader is spread only by manually twisting the rotating discs, and the spreading force is very limited;

3. the design of the joint of the distraction arm and the traction needle is too simple, so that the traction needle is easy to deform, the traction force is further lost, and even the retractor slips.

Disclosure of Invention

The invention aims to provide a percutaneous axial distraction system for assisting minimally invasive calcaneal fracture surgery, so that the problems are solved, and the functions of the percutaneous axial distraction system are innovated and optimized.

In order to achieve the purpose, the invention discloses a percutaneous axial distraction system for assisting minimally invasive calcaneal fracture surgery, which comprises a distraction needle and two groups of distraction components, wherein any one of the distraction components comprises a fixed stay bar, a connecting rod, a movable stay bar and a rotating handle, one end of the fixed stay bar is provided with a fixed stay bar hole which can be sleeved with the distraction needle, the other end of the fixed stay bar is fixedly connected with one end of the connecting rod, one end of the movable stay bar is provided with a movable stay bar hole which can be sleeved with the distraction needle, the other end of the movable stay bar is connected with the connecting rod in a non-relative-rotation mode in a sliding mode, and the rotating handle drives the movable stay bar to rotate to be far away from the fixed stay bar.

Furthermore, the connecting rod is of a cubic column structure, and a hollow cubic sleeve matched and sleeved with the connecting rod is arranged at the other end of the movable supporting rod.

Furthermore, the middle part of activity vaulting pole is provided with the screw thread sleeve, still include with screw thread sleeve threaded connection's screw thread vaulting pole, the one end of screw thread vaulting pole support by lean on fixed vaulting pole, the other end is provided with through turning handle driven rotatory drive end.

Further, rotatory drive end is the hexagonal head who sets up at the screw vaulting pole other end, turning handle is T type handle, T type handle includes perpendicular dwang and the actuating lever of connecting, the tip of actuating lever be provided with hexagonal head complex hexagonal hole.

Furthermore, a limiting protrusion is arranged on the fixed stay bar, a limiting hole matched with the limiting protrusion is formed in one end of the threaded stay bar, and one end of the threaded stay bar is always limited in the limiting protrusion to ensure coaxial driving.

Further, still include extension rod, threaded sleeve and connecting block, the perpendicular rigid coupling of one end of extension rod is in on the activity vaulting pole, the other end with the connecting block rigid coupling, threaded sleeve rigid coupling is in on the connecting block, twist grip in order to lean on reach the mode of the connecting rod other end with threaded sleeve's screw hole is connected.

Furthermore, twist grip is T type handle, T type handle includes perpendicular dwang and the actuating lever of connecting, the actuating lever with the screw hole is connected.

Furthermore, the end part of the driving rod is provided with a limiting counter bore which can be sleeved outside the other end of the connecting rod.

Furthermore, the fixed stay bar and the connecting rod are integrally bent and formed through a straight rod, and the included angle between the fixed stay bar and the connecting rod is 80-100 degrees.

Furthermore, the bottom of the fixed stay bar is fixedly connected with a fixed stay bar lengthening sleeve, the fixed stay bar hole is arranged in the fixed stay bar lengthening sleeve, the bottom of the movable stay bar is fixedly connected with a movable stay bar lengthening sleeve, and the movable stay bar hole is arranged in the movable stay bar lengthening sleeve.

Compared with the prior art, the invention has the advantages that:

1. the invention has simple structure, simple and convenient installation, extremely small percutaneous installation wound, simple operation, traction by mechanical force and strong distraction force;

2. the fixed stay bar, the connecting rod and the movable stay bar are of a cubic column structure, wherein the fixed stay bar is fixedly connected with the connecting rod, and one end of the movable stay bar is provided with a hollow cubic sleeve which is matched and sleeved with the connecting rod in a sleeved mode and is connected in a sliding mode in a non-relative-rotation mode. The design can ensure the stability of the distraction assembly and can avoid rotation or deflection in the distraction process;

3. according to the invention, the rotating handle is rotated to drive the threaded stay bar to rotate forwards in the threaded sleeve by mechanical force, and the front end of the threaded stay bar is propped against the fixed stay bar, so that the movable stay bar is mechanically pulled to be far away from the fixed stay bar by utilizing the principle of acting force and counterforce, and the opening force is strong;

4. the traction needle is a common Kirschner wire commonly prepared in an operating room, the materials are convenient to obtain and low in cost, the selected diameter is 3.0mm, the rigidity and the strength of the traction needle can meet the requirement of distraction, the traction needle is not easy to deform, the Kirschner wire with the diameter has small damage to the talus head, and the iatrogenic fracture is not easy to cause;

5. the bottom parts of the fixed stay bar and the movable stay bar are fixedly connected with the stay bar lengthening sleeve, so that the lengthening sleeve is close to a bone as much as possible when the distractor is inserted at two ends of the traction needle, the working length of the traction needle outside the bone can be shortened as much as possible, the deformation of the traction needle is further reduced, and the loss of traction force when the traction force is transmitted to the traction needle is reduced;

6. the invention can realize the distraction only by rotating the rotating handle, and can respectively perform distraction of different forces on the inner side distraction assembly and the outer side distraction assembly according to the requirement of restoration, thereby having simple and convenient operation; the rotary handle can be detached after the driving is finished, so that the operation behind the calcaneus cannot be blocked, and the X-ray perspective shielding in the operation cannot be caused;

7. two traction needles are respectively arranged at two ends of a broken line of the calcaneus and are positioned on a long axis of the calcaneus (a near end traction needle percutaneously traverses the center of the calcaneus, and a far end traction needle percutaneously traverses the center of a tuberosity behind the calcaneus), and the distraction is realized according to the long axis of the calcaneus. Thus, when in reduction, the auxiliary reduction function of the fracture end soft tissue hinge can be exerted to the maximum;

8. the invention is installed percutaneously, the way of opening is closed opening, in the process of opening, the general shape of the calcaneus, namely the length, the width and the height, can be quickly recovered by the action of a fracture end soft tissue hinge (the fracture end soft tissue can assist in pulling a fracture block and automatically returning the fracture end by the tension during opening);

9. the invention can continuously maintain the reset state after the fracture end of the calcaneus is completely and axially opened by pure closing. The method creates a key premise for the subsequent minimally invasive surgery treatment of the joint surface for percutaneous prying reduction calcaneal displacement and percutaneous screw fixation.

The present invention will be described in further detail below with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is an axial view of a percutaneously mounted minimally invasive surgical axial distraction system for assisting calcaneal fractures, in accordance with an embodiment of the present invention;

FIG. 2 is a schematic front view of a percutaneously mounted axial distraction system for minimally invasive surgery to assist with calcaneus fractures, in accordance with an embodiment of the present invention;

FIG. 3 is an axial view of an embodiment of the invention, which discloses a percutaneously mounted axial distraction system for minimally invasive surgery for calcaneal fracture assistance;

FIG. 4 is a perspective view of an insertion point of a retractor needle according to an embodiment of the present invention;

FIG. 5 is a schematic axial calcaneus view showing the insertion direction of the retractor according to an embodiment of the present invention;

FIG. 6 is a schematic perspective view of the percutaneous installation of an axial distraction system for minimally invasive surgery for calcaneal fracture in an embodiment of the present invention before operation;

FIG. 7 is a schematic perspective view of an axial distraction system for minimally invasive percutaneous surgery to assist with calcaneal fractures according to an embodiment of the present invention during operation;

FIG. 8 is a schematic perspective view of the completion of the operation of the percutaneously mounted axial distraction system for assisting a minimally invasive calcaneal fracture surgery and the completion of percutaneous leverage reduction, according to an embodiment of the present invention;

fig. 9 is a schematic axial plane view of the calcaneus after the operation of the percutaneously mounted axial distraction system for assisting minimally invasive surgery on calcaneus fracture is completed, according to the embodiment of the invention.

Illustration of the drawings:

1. a traction needle; 2. a distraction assembly; 21. fixing the stay bar; 211. fixing a stay bar hole; 22. a connecting rod; 23. a movable stay bar; 231. a movable stay bar hole; 232. sliding connection holes; 233. a hollow cubic sleeve; 24. rotating the handle; 241. rotating the rod; 242. a drive rod; 243. limiting counter bores; 244. a hexagonal hole; 25. a threaded sleeve; 251. a threaded hole; 26. an extension rod; 27. connecting blocks; 28. a fixed stay bar lengthening sleeve; 29. a threaded brace rod; 291. a hexagonal head; 292. a limiting hole; 30. lengthening the movable support rod; 31. and a limiting bulge.

Detailed Description

Embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.

The first embodiment is as follows:

as shown in fig. 1-2, the embodiment of the invention discloses an axial distraction system for percutaneous installation to assist minimally invasive calcaneal fracture surgery, which comprises a traction needle 1 and two sets of distraction components 2, wherein any one of the distraction components 2 comprises a fixed stay bar 21, a connecting rod 22, a movable stay bar 23 and a rotating handle 24, the number of the traction needles 1 is two, the two traction needles are common kirschner needles which are commonly prepared in an operating room and have the diameter of 3.0mm, and the two traction needles have the strength and the rigidity which can well resist the retraction force and are not easy to deform. One end of the fixed stay bar 21 is provided with a fixed stay bar hole 211 which can be sleeved with the traction needle 1, the other end of the fixed stay bar is fixedly connected with one end of the connecting rod 22, specifically, the fixed stay bar 21 and the connecting rod 22 are bent into an L shape through a straight rod in an integrated mode, and the fixed stay bar 21 and the connecting rod 22 are vertically arranged at an angle of 90 degrees. One end of the movable stay 23 is provided with a movable stay hole 231 which can be sleeved with the traction needle 1, the other end of the movable stay is provided with a sliding connection hole 232 which is in sliding connection with the connecting rod 22, the connecting rod 22 is in a cubic column structure (including prism structures such as triangular prism, quadrangular prism and hexagonal prism), the other end of the movable stay 23 is provided with a hollow cubic sleeve 233 which is in matching and sleeving connection with the connecting rod 22, and the sliding connection hole 232 is a square hole. Therefore, the connecting rod 22 and the movable stay bar 23 can not rotate relatively, so that the connecting strength and the supporting stability among the fixed stay bar 21, the connecting rod 22 and the movable stay bar 23 are improved, mutual rotation and deflection are avoided, and the axial opening of the spreader according to the calcaneus long axis can be ensured.

In order to realize the driving of the turning handle 24, a threaded support rod 29 which is in threaded connection with the threaded sleeve 25 is further included, and the threaded support rod 29 is arranged in parallel with the connecting rod 22. The threaded sleeve 25 is disposed between two ends of the movable stay 23, and before the distraction is performed, one end of the threaded stay 29 is abutted against the fixed stay 21, and one end of the threaded stay 29 is provided with a limiting hole 292, specifically a counter bore, which is matched with the limiting protrusion 31 on the fixed stay 21, so as to prevent the one end of the threaded stay 29 from slipping when abutting against the fixed stay 21. The other end of the threaded strut 29 is provided with a rotary drive end. Specifically, the rotary driving end at the other end of the threaded stay bar 29 is a hexagonal head 291, the rotary handle 24 is a T-shaped handle, the T-shaped handle includes a rotary bar 241 and a driving bar 242 which are vertically connected, a hexagonal hole 244 matched with the hexagonal head 291 is arranged at the end of the driving bar 242, when the handle needs to be used, the hexagonal hole 244 is sleeved into the hexagonal head 291, and then the active rotary bar 241 can drive the movable stay bar 23 to be away from the fixed stay bar 21, so that the stretching is realized, and the stretching state can be continuously maintained, optionally, the rotary driving end at the other end of the threaded stay bar 29 is the hexagonal hole 244, and the end of the driving bar 242 is the hexagonal head 291.

In this embodiment, the axes of the fixed stay hole 211 and the movable stay hole 231 are arranged in parallel, facilitating parallel traction.

In this embodiment, when the distractor is inserted into the two ends of the traction needle 1, in order to shorten the working length of the traction needle 1 outside the bone as much as possible and further reduce the deformation of the traction needle 1, the fixed stay extension sleeve 28 is fixedly connected to the bottom of the fixed stay 21, and the fixed stay hole 211 is formed in the fixed stay extension sleeve 28, so that the fixed stay extension sleeve 28 can be tightly attached to the bone. The bottom of the movable brace 23 is fixedly connected with a movable brace lengthening sleeve 30, and a movable brace hole 231 is arranged in the movable brace lengthening sleeve 30, so that the movable brace lengthening sleeve 30 can be tightly attached to the bone.

As shown in figures 4-8, the application method and process of the percutaneous axial distraction system for minimally invasive surgery for assisting calcaneal fracture of the invention are as follows (in particular, as shown in figure 4, the forward extension line of the tangent line of the upper posterior edge of the normal calcaneus usually passes through the talus neck, and the long axis of the calcaneus is parallel to the talus neck, namely, the connecting line of the central point of the talus and the central point of the tuberosity of the calcaneus):

1. first, the central point of the talar bone and the central point of the tuberosity of the posterior calcaneus on the lateral plate were visualized using a 2ml syringe needle as a marker to determine the lateral percutaneous insertion point of the introducer needle 1. Wherein the talus side traction needle 1 is arranged in the direction vertical to the sagittal plane of the affected foot; the insertion direction of the calcaneal side traction needle 1 is combined with the calcaneal axial position perspective image and is placed in the direction perpendicular to the longitudinal axis of the calcaneal axial position image. This ensures that the needles 1 are positioned perpendicular to the calcaneus axis and thus can be spread along the long axis of the calcaneus (see fig. 4 and 5).

2. Then, small incisions of 4mm are made in the positions where the traction needles 1 go in and out of the skin in sequence, local skin soft tissues are properly separated, the inner and outer sets of the spreader components 2 of the spreader are installed according to the drawing, the fixed stay bar 21 and the movable stay bar 23 are respectively sleeved in the parts of the two traction needles 1 exposed out of the skin, and the fixed stay bar lengthening sleeve 28 and the movable stay bar lengthening sleeve 30 are both attached to the calcaneus face (as shown in fig. 6).

3. At this time, by rotating the T-shaped handle, the threaded stay 29 is pushed forward in the threaded sleeve 25, and when the front end of the threaded stay 29 abuts against the fixed stay 21, the movable stay 23 is pulled away from the fixed stay 21 by using the principle of acting force and reaction force, so as to achieve the purpose of opening (see fig. 7).

4. Because the opening mode is closed and opened along the long axis of the calcaneus, in the opening process, the general shape of the calcaneus, namely the length, the width and the height, can be quickly recovered under the action of a fracture end soft tissue hinge (the fracture end soft tissue can assist in pulling a fracture block and automatically returning the fracture broken end by means of tension during opening). Meanwhile, the original space of the calcaneal fracture end is recovered, and the reduction state can be continuously maintained. The key premise is created for the subsequent minimally invasive surgery treatment of percutaneous prying reduction of the articular surface of calcaneal displacement and percutaneous screw fixation (as shown in figures 8 and 9).

Example two:

in the present embodiment, as shown in fig. 3, the structural layout of the fixed stay 21, the connecting rod 22, and the movable stay 23 is substantially similar to that of the first embodiment.

The difference from the first embodiment is that:

a threaded sleeve 25 with a threaded hole 251 is fixedly connected to one side of the movable stay 23, and the rotary handle 24 is connected to the threaded hole 251 so as to abut against the other end of the connecting rod 22. In order to realize the fixed mounting and the coaxial arrangement of the threaded sleeve 25, the device further comprises an extension rod 26 and a connecting block 27, one end of the extension rod 26 is vertically fixedly connected to the movable support rod 23, the other end of the extension rod is fixedly connected to the connecting block 27, and the threaded sleeve 25 is fixedly connected to the connecting block 27. The twist grip 24 is a T-shaped grip, the T-shaped grip includes a rotating rod 241 and a driving rod 242 which are connected by vertical welding, the driving rod 242 is a threaded rod with external threads, the external threads of the driving rod 242 are connected with the threaded hole 251, and the rotating rod 241 can apply rotating force more conveniently. The connecting rod 22, the driving rod 242 and the threaded sleeve 25 are coaxially arranged, and the connecting rod 22, the driving rod 242 and the extension rod 26 are arranged in parallel, so that parallel traction is facilitated. Further, in order to prevent the driving rod 242 from slipping when applying force to the connecting rod 22, the end portion of the driving rod 242 is provided with a limiting counterbore 243 capable of being sleeved outside the other end of the connecting rod 22, and when the connecting rod rotates, the other end of the connecting rod 22 is always limited in the limiting counterbore 243, so that coaxial driving is ensured.

Wherein, compared with the design and performance of the embodiment, the first embodiment further has the following advantages: first, the connecting rod 22 of the first embodiment is a cubic column structure, and the other end of the movable stay 23 is provided with a hollow cubic sleeve 233 that is in matching socket with the connecting rod 22, i.e. the sliding ends of the connecting rod 22 and the movable stay 23 cannot rotate relatively. Therefore, the rotation and deflection of the distraction assembly 2 in the distraction process can be avoided, and the distraction device is ensured to be distracted according to the axis of the calcaneus; secondly, the bilateral components of the first embodiment can share one rotating handle 24, and the rotating handle 24 can be detached after the driving is completed, so that the operation behind the calcaneus cannot be blocked, and the X-ray perspective shielding in the operation cannot be caused; third, the design of the first embodiment is more compact and lightweight.

As shown in figures 4-9, the method and procedure of using the percutaneous axial distraction system for minimally invasive surgery to assist fracture of the calcaneus bone of the present invention are as follows (the procedure is substantially the same as the first embodiment, and in the same way, in particular, as shown in figure 4, the forward extension line of the upper edge of the calcaneus bone usually passes through the talus neck, and the long axis of the calcaneus bone is parallel to the long axis, i.e. the line connecting the central point of the talus bone and the central point of the tuberosity behind the calcaneus bone):

1. first, the central point of the talar bone and the central point of the tuberosity of the posterior calcaneus on the lateral plate were visualized using a 2ml syringe needle as a marker to determine the lateral percutaneous insertion point of the introducer needle 1. Wherein the talus side traction needle 1 is arranged in the direction vertical to the sagittal plane of the affected foot; the needle inserting direction of the calcaneus side traction needle needs to be combined with the axial calcaneus perspective image to be placed in the direction vertical to the longitudinal axis of the axial calcaneus image. This ensures that the needles 1 are positioned perpendicular to the calcaneus axis and thus can be spread along the long axis of the calcaneus (see fig. 4 and 5).

2. Then, small incisions of 4mm are made in the positions of the traction needles entering and exiting the skin in sequence, local skin soft tissues are properly separated, the inner and outer groups of the spreader assemblies 2 of the spreader are installed according to the drawing, the fixed stay 21 and the movable stay 23 are respectively sleeved on the parts of the two traction needles 1 exposed out of the skin, and the fixed stay lengthening sleeve 28 and the movable stay lengthening sleeve 30 are both attached to the calcaneus surface (refer to fig. 6).

3. At this time, by rotating the T-shaped handle, the driving rod 242 is pushed forward in the threaded sleeve 25, and when the front end of the threaded rod abuts against the fixed stay 21, the movable stay 23 is pulled away from the fixed stay 21 by using the principle of acting force and reaction force, so as to achieve the purpose of opening (see fig. 7).

4. Because the mode of strutting is for strutting along calcaneum major axis closure, at the in-process of strutting, owing to the effect of fracture end soft tissue hinge (fracture end soft tissue can assist tractive fracture piece and the automatic return of fracture broken ends with the help of the tension when strutting), can resume the general form of calcaneum promptly, length, width and height promptly, resume the original space of calcaneum fracture end simultaneously, and sustainable maintenance this kind of reset state. The key premise is created for the follow-up minimally invasive surgery treatment of restoring the joint surface of the calcaneus displacement by prying and placing screws percutaneously (refer to fig. 8 and 9).

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The axial distraction system of the percutaneous-mounted minimally invasive surgery for assisting calcaneal fracture is characterized by comprising a distraction needle (1) and two sets of distraction components (2), wherein any one of the distraction components (2) comprises a fixed strut (21), a connecting rod (22), a movable strut (23) and a rotating handle (24), one end of the fixed strut (21) is provided with a fixed strut hole (211) capable of being sleeved with the distraction needle (1), the other end of the fixed strut is fixedly connected with one end of the connecting rod (22), one end of the movable strut (23) is provided with a movable strut hole (231) capable of being sleeved with the distraction needle (1), the other end of the movable strut is in sliding connection with the connecting rod (22) in a non-relative-rotating manner, and the rotating handle (24) rotationally drives the movable strut (23) to be far away from the fixed strut (21).

2. The percutaneous installation axial distraction system for minimally invasive surgery of calcaneal fracture as claimed in claim 1, wherein the connecting rod (22) is of a cubic column structure, and the other end of the movable stay bar (23) is provided with a hollow cubic sleeve (233) which is in matched sleeve connection with the connecting rod (22).

3. The percutaneous installation axial distraction system for minimally invasive surgery of calcaneus fracture, according to claim 1, wherein a threaded sleeve (25) is arranged in the middle of the movable stay (23), and further comprising a threaded stay (29) in threaded connection with the threaded sleeve (25), one end of the threaded stay (29) abuts against the fixed stay (21), and the other end is provided with a rotary driving end driven by the rotating handle (24).

4. The percutaneous installation axial distraction system for minimally invasive surgery for assisting calcaneus fracture according to claim 3, wherein the rotary driving end is a hexagonal head (291) arranged at the other end of the threaded support rod (29), the rotating handle (24) is a T-shaped handle, the T-shaped handle comprises a rotating rod (241) and a driving rod (242) which are vertically connected, and the end of the driving rod (242) is provided with a hexagonal hole (244) matched with the hexagonal head (291).

5. The percutaneous installation axial distraction system for minimally invasive surgery of auxiliary calcaneus fracture according to claim 3, wherein a limit protrusion (31) is arranged on the fixed stay (21), and a limit hole (292) matched with the limit protrusion (31) is arranged at one end of the threaded stay (29).

6. The percutaneous axial distraction system for minimally invasive surgery for calcaneus fracture assist according to claim 1, further comprising an extension rod (26), a threaded sleeve (25) and a connecting block (27), wherein one end of the extension rod (26) is vertically fixed on the movable supporting rod (23), the other end of the extension rod is fixed on the connecting block (27), the threaded sleeve (25) is fixed on the connecting block (27), and the rotating handle (24) is connected with the threaded hole (251) of the threaded sleeve (25) in a manner of abutting against the other end of the connecting rod (22).

7. The percutaneously mounted axial distracting system of minimally invasive surgery to assist with calcaneus fractures according to claim 6, wherein the rotating handle (24) is a T-handle, the T-handle comprises a rotating rod (241) and a driving rod (242) which are vertically connected, and the driving rod (242) is connected with the threaded hole (251).

8. The percutaneous installation axial distraction system for minimally invasive surgery of auxiliary calcaneus fracture according to claim 7, wherein the end of the driving rod (242) is provided with a limiting counter bore (243) which can be sleeved outside the other end of the connecting rod (22).

9. The percutaneously mounted axial distraction system for minimally invasive surgery of assisted calcaneus fracture according to any one of claims 1-8, wherein the fixed struts (21) and the connecting rods (22) are integrally bent and formed through a straight rod, and the included angles of the fixed struts (21) and the connecting rods (22) are 80-100 degrees.

10. The percutaneous axial distraction system for minimally invasive surgery to assist calcaneus fracture according to any one of claims 1-8, wherein a fixed strut lengthening sleeve (28) is fixedly connected to the bottom of the fixed strut (21), the fixed strut hole (211) is disposed in the fixed strut lengthening sleeve (28), a movable strut lengthening sleeve (30) is fixedly connected to the bottom of the movable strut (23), and the movable strut hole (231) is disposed in the movable strut lengthening sleeve (30).

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