CN115399907A

CN115399907A - Fixing device for repairing fracture of Achilles tendon

Info

Publication number: CN115399907A
Application number: CN202211071227.6A
Authority: CN
Inventors: 王力平; 江涛
Original assignee: Hangzhou Huamai Medical Technology Co ltd
Current assignee: Hangzhou Huamai Medical Technology Co ltd
Priority date: 2022-09-01
Filing date: 2022-09-01
Publication date: 2022-11-29

Abstract

The embodiment of the application provides a fixing device for repairing ruptured achilles tendon, which comprises a first fixing frame, a second fixing frame and at least two connecting rods, wherein the at least two connecting rods are arranged at intervals along the width direction of the fixing device; the first fixing frame comprises a first fixing needle and a second fixing needle which are fixedly connected with each other, the first fixing needle penetrates through and is fixed on the metatarsus, and the second fixing needle penetrates through and is fixed on the radicle; the second fixing frame at least comprises a third fixing needle, and the third fixing needle penetrates through and is fixed on the tibia; the first ends of the two connecting rods are respectively movably connected with the two ends of the first fixing needle; the second ends of the two connecting rods are respectively movably connected with the two ends of the third fixing needle. The third fixing needle is used as a base point, the distance between the metatarsus and the third fixing needle is limited through the connecting rod, the tension required by repair and fixation and rehabilitation is applied to the achilles tendon for fixation, and the recovered achilles tendon is guaranteed to have the original due strength. The movable connection ensures that the joint is limited in a controllable range, and a certain movement space is reserved, so that the problems of joint stiffness and the like are solved.

Description

Fixing device for repairing fracture of Achilles tendon

Technical Field

The application relates to the technical field of medical equipment, in particular to a fixing device for repairing broken achilles tendons.

Background

In the research of repairing the achilles tendon fracture, the achilles tendon of an experimental animal needs to be fixed after the operation. The fixing mode in the related technology belongs to rigid fixing, so that the related joints completely lose mobility, and the broken achilles tendon is fixed in tension unchanged from surgical suture to postoperative healing recovery, so that the achilles tendon muscle atrophy and the muscle tissue adipogenesis are easily caused; the broken achilles tendon is anastomosed and adhered to the tissue surrounding the tendon, the original strength of the healed achilles tendon is lost, and the joint stiffness complication after the achilles tendon is healed may occur, so that the fixing device is urgently needed to be provided for solving the problems of poor function and joint stiffness complication after the achilles tendon is healed, which are caused by the existing fixing device.

Disclosure of Invention

An object of this application embodiment is to provide a fixing device for after achilles tendon fracture repair for the problem of the intensity that the solution achilles tendon healed back weakens and appears joint stiffness complication easily. The specific technical scheme is as follows:

the embodiment of the application provides a fixing device for repairing ruptured achilles tendon, which comprises a first fixing frame, a second fixing frame and at least two connecting rods, wherein the at least two connecting rods are arranged at intervals in the width direction of the fixing device;

the first fixing frame comprises a first fixing needle and a second fixing needle which are fixedly connected with each other, the first fixing needle is used for penetrating and fixing the first fixing needle on the metatarsus, and the second fixing needle is used for penetrating and fixing the second fixing needle on the radicle; the second fixing frame at least comprises a third fixing needle, and the third fixing needle is used for penetrating through and fixing the tibia;

the first ends of the two connecting rods are respectively movably connected with the two ends of the first fixing needle; the second ends of the two connecting rods are respectively movably connected with the two ends of the third fixing needle, and the connecting rods are matched with the first fixing frame and the second fixing frame to fix the achilles tendon.

The utility model provides a be used for cracked fixing device of achilles tendon, use first fixed needle to run through in the metatarsal, the fixed needle of second runs through in the root bone, the fixed needle of third runs through in the shin bone, the first end and the first fixed needle of connecting rod are connected, second end and the fixed needle swing joint of third, thus, the shin bone, the root bone, the metatarsal, the connecting rod forms the triangle-shaped structure jointly, rely on fixed and indirect realization to the achilles tendon of relevant limbs joint skeleton, the triangle-shaped structure is comparatively stable, thereby avoided because of fixed not in place the condition such as fracture achilles tendon suture port nonunion, and, the connecting rod of accessible selection different length is with the tension of adjustment fracture achilles tendon required load after repairing, it reaches the functional healing to satisfy the achilles tendon after the restoration, guarantee that the achilles tendon after the rehabilitation possesses its due intensity originally. The connecting rod is movably connected with the first fixing needle and the third fixing needle, the limbs are limited to move in a controllable moving range, and joint stiffness complications caused by complete loss of joint movement of rigid fixation of achilles tendon fracture repair or achilles tendon dysfunction complications such as achilles tendon tissue adhesion can be prevented.

In some embodiments of the present application, a middle portion of the first fixing pin is inserted into the metatarsal bones, and both ends of the first fixing pin are located outside the metatarsal bones, and both ends of the first fixing pin are respectively formed with first collars;

second lantern rings are respectively formed at the first ends of the two connecting rods, and the first ends of the two connecting rods are respectively movably connected with the two ends of the first fixing needle through the second lantern rings and the first lantern rings;

the middle part of the third fixing needle penetrates through the tibia, two ends of the third fixing needle are positioned outside the tibia, and fourth lantern rings are formed at two ends of the third fixing needle respectively;

and the second ends of the two connecting rods are respectively provided with a third lantern ring, and the second ends of the two connecting rods are respectively movably connected with the two ends of the third fixing needle through the third lantern ring and the fourth lantern ring.

In some embodiments of the present application, at least a portion of both ends of the first fixing pin located outside the metatarsal bones is used for bending to form two first connection portions; the utility model discloses a root bone fixing device, including first fixing frame, root bone, first connecting portion, second fixing needle, first connecting portion, second connecting portion, first fixing frame, second fixing needle, the first fixing frame is fixed to the root bone, and the first fixing frame is fixed to the second connecting portion, the second fixing frame is fixed to the root bone, the first fixing frame is fixed to the second fixing frame, the second fixing frame is fixed to the root bone, the second fixing frame is fixed to the second fixing frame, the first fixing frame is fixed to the root bone, the second fixing frame is fixed to the second fixing frame, the second fixing frame is fixed to the root bone, the root bone is fixed to the second fixing frame, the root bone is fixed to the root bone outside, be located the root bone outside at least part at the both ends of second fixing needle is used for buckling to form two second connecting portions, first connecting portion with second connecting portion are connected to form first fixing frame.

In some embodiments of the present application, the first fixing frame is a rectangular frame structure.

In some embodiments of the present application, the first connecting portion and the second connecting portion are bonded to form the first fixing frame.

In some embodiments of the present application, the connecting rod includes first and second segments and a sleeve connector, at least portions of the first and second segments being located within and connected by the sleeve connector such that the length of the connecting rod is adjustable.

In some embodiments of the present application, at least a portion of the first and second sections are provided with external threads, and the sleeve connector is provided with internal threads that mate with the external threads to threadably connect the first and second sections with the sleeve connector to form the connecting rod that is adjustable in length.

In some embodiments of the present application, a limiting member is further connected to each end of the sleeve connector, and at least a portion of the limiting member is located in the sleeve connector; an elastic part is arranged in the sleeve connector, the first section and the second section penetrate through the limiting part and are connected with the elastic part to form the connecting rod with adjustable length, and the limiting part is used for limiting the elastic part to extend out of the sleeve connector.

In some embodiments of the present application, the stopper is adhesively connected to the sleeve connector.

In some embodiments of the present application, the second fixing frame further includes a fourth fixing pin arranged in parallel to the third fixing pin at an interval, a portion of the third fixing pin penetrates through the tibia, two ends of the third fixing pin are both located outside the tibia, and at least a portion of two ends of the third fixing pin located outside the tibia is used for bending to form two third connecting portions; a part of the fourth fixing needle penetrates through the tibia, two ends of the fourth fixing needle are located outside the tibia, at least parts of two ends of the fourth fixing needle are used for bending to form two fourth connecting portions, and the third connecting portions are connected with the fourth connecting portions to form a second fixing frame.

In some embodiments of the present application, a distance between the third fixing pin and the first fixing frame is smaller than a distance between the fourth fixing pin and the first fixing frame.

In some embodiments of the present application, the middle portions of the first, second, third and fourth fixing pins are provided with threaded sections for anchoring bone.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the description below are only some embodiments of the present application, and other embodiments can be obtained by those skilled in the art according to the drawings.

FIG. 1 is a schematic view of a limb of a fixing laboratory mouse of a fixing device for repairing broken achilles tendon provided by an embodiment of the application;

FIG. 2 is a schematic view of an anchoring limb of the anchoring device for repairing ruptured Achilles tendon provided by an embodiment of the present application;

FIG. 3 is a block diagram of a fixation device for repair of Achilles tendon rupture according to an embodiment of the present disclosure;

FIG. 4 is a structural diagram of a connecting rod provided in an embodiment of the present application;

FIG. 5 is another block diagram of a fixation device for repair of Achilles tendon rupture provided in an embodiment of the present application;

FIG. 6 is a partial perspective view of another configuration of a fixation device for achilles tendon rupture repair provided in accordance with an embodiment of the present application;

FIG. 7 is another block diagram of a connecting rod according to an embodiment of the present disclosure;

FIG. 8 is a block diagram of a sleeve connector provided in an embodiment of the present application;

fig. 9 is a partial cross-sectional view provided in accordance with an embodiment of the present application.

The reference numbers are as follows:

10: metatarsal bone, 20: root bone, 30: a tibia;

100: first mount, 101: second mount, 102: first connection portion, 103: second connection portion, 104: third connection portion, 105: a fourth connecting portion;

202: fourth fixing pin, 203: thread segment, 204: third fixing pin, 205: fourth collar, 206: second fixing pin, 207: first collar, 208: a first fixing pin;

302: connecting rod, 303a: second collar, 303b: third collar, 304: sleeve connector, 305: handle, 312a: first stage, 312b: a second stage;

402: a stopper, 404: an elastic member;

l: a length direction; w: a width direction; h: the height direction.

Detailed Description

The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the description herein are intended to be within the scope of the present disclosure.

The relative fixation is required in the healing process after the achilles tendon rupture repair operation because if the limbs are completely fixed, the problems of joint stiffness complication after the achilles tendon is healed, adhesion of healed repaired achilles tendon and surrounding tissues and the like can occur; if the limbs are not fixed in place, the broken achilles tendon suture port of the experimental animal is not healed in the running, jumping and other processes. Therefore, the postoperative relative fixation of the broken achilles tendon requires the particularity of the limb fixation, and the fixed and movable positions are required.

In addition, the effect of stress deprivation on tendon tissue resulting from Achilles tendon fixation has been an important focus in the field of biomechanics. Mechanical or stress loads have a direct effect on post-operative healing of the fractured achilles tendon, tendon-to-tendon healing, and tendon-to-bone healing. Therefore, the achilles tendon is required to be fixed by repair, and the stress load for fixing the achilles tendon has an adjustable tension range, so that the repaired achilles tendon can be functionally healed, and the restored achilles tendon can have the original strength.

An embodiment of the first aspect of the present application provides a fixing device for repairing ruptured achilles tendon, as shown in fig. 1 to 3, including a first fixing frame 100, a second fixing frame 101, at least two connecting rods 302 arranged at intervals along a width direction W of the fixing device; the first fixing frame 100 comprises a first fixing needle 208 and a second fixing needle 206 fixedly connected with each other, the first fixing needle 208 is used for penetrating and fixing on the metatarsal bone 10, the second fixing needle 206 is used for penetrating and fixing on the root bone 20, the second fixing frame 101 at least comprises a third fixing needle 204, and the third fixing needle 204 is used for penetrating and fixing on the tibia 30; a first end of the connecting rod 302 is movably connected with two ends of the first fixing needle 208, a second end of the connecting rod 302 is movably connected with two ends of the third fixing needle 204, and the connecting rod 302 is matched with the first fixing frame 100 and the second fixing frame 101 to fix the achilles tendon.

The fixing device for repairing the broken achilles tendon provided by the embodiment of the application uses the first fixing needle 208 to penetrate through the metatarsal bone 10, the second fixing needle 206 to penetrate through the radicle 20, and the third fixing needle 204 to penetrate through the tibia 30. The first end of the connecting rod 302 is movably connected with the first fixing needle 208, the second end of the connecting rod 302 is movably connected with the third fixing needle 204, and the triangular relation among the tibia 30, the root bone 20 and the metatarsal bone 10 is adopted, so that the tibia 30, the root bone 20, the metatarsal bone 10 and the connecting rod 302 jointly form a triangular structure, the achilles tendon connected with the root bone 20 is indirectly fixed by means of fixing the relevant limb joint bones, and the situations that the suture port of the broken achilles tendon is not healed due to the fact that the achilles tendon is not fixed in place are avoided.

Further, the Achilles tendon is connected to the gastrocnemius and the soleus muscle at one end and to the ossicle 20 at the other end, and the tension of the Achilles tendon load can be adjusted by adjusting the Achilles tendon, i.e., the distance between the connection point of the ossicle 20 and the soleus muscle. The present application uses the third fixing needle 204 penetrating the tibia 30 as a base point, and uses the connecting rod 302 with different lengths, so that the distance between the first fixing needle 208 and the third fixing needle 204 is adjustable to achieve the required tension of the achilles tendon load. It can be understood that, the position that third fixing needle 204 runs through in shin bone 30 is the basic point, through using the connecting rod 302 of required length, adjusts the angle between shin bone 30 and the 10 radical bones 20 of metatarsal, and radical bones 20 upwards changes downwards to the distance between adjustment achilles tendon and the 20 tie point of radical bones and gastrocnemius muscle and soleus muscle realizes the regulation to the required tension of achilles tendon, and in certain cycle, tension along with the continuous promotion of healing phase, just can satisfy the achilles tendon after the restoration and reach the functional healing, guarantees that the achilles tendon after the rehabilitation possesses its intensity that should originally.

In addition, the connecting rod 302, the third fixing needle 204 and the first fixing needle 208 are movably connected, a micro-motion space is reserved in the joint, the limbs can move within a controllable moving range in a limited mode, and joint stiffness complications caused by complete loss of mobility of rigid fixation of achilles tendon fracture repair, achilles tendon tissue adhesion complications and the like can be prevented.

In the present embodiment, the direction in which the first fixing pin 208 penetrates the metatarsal bone 10 and the direction in which the second fixing pin 206 penetrates the radicular bone 20 are the width direction W of the fixing device, the direction perpendicular to the width direction W is defined as the length direction L of the fixing device, and the direction perpendicular to the plane in which the width direction W and the length direction L are located is the height direction H of the fixing device.

In some embodiments, as shown in fig. 1 to 4, a middle portion of the first fixing pin 208 is inserted into the metatarsal bone 10, two ends of the first fixing pin 208 are located outside the metatarsal bone 10, and two ends of the first fixing pin 208 are respectively formed with a first collar 207; the first ends of the two connecting rods 302 are respectively formed with a second lantern ring 303a, and the first ends of the two connecting rods 302 are respectively movably connected with the two ends of the first fixing needle 208 through the second lantern ring 303a and the first lantern ring 207; the middle part of the third fixing pin 204 penetrates through the tibia 30, two ends of the third fixing pin 204 are positioned outside the tibia 30, and fourth lantern rings 205 are respectively formed at two ends of the third fixing pin 204; the second ends of the two connecting rods 302 are respectively formed with a third lantern ring 303b, and the second ends of the two connecting rods 302 are respectively movably connected with the two ends of the third fixing pin 204 through the third lantern ring 303b and the fourth lantern ring 205.

In this embodiment, the middle portion of the first fixing pin 208 is inserted into the metatarsal bone 10, the middle portion of the third fixing pin 204 is inserted into the tibia 30, the two first collars 207 are located on both sides of the metatarsal bone 10, the two fourth collars 205 are located on both sides of the tibia 30, the first ends of the two connecting rods 302 are respectively formed with a second collar 303a, and the second ends of the two connecting rods 302 are respectively formed with a third collar 303b. Two connecting rods 302 are arranged along the width direction W of the fixing device, two second collars 303a at the first end are respectively sleeved with the two first collars 207, and two third collars 303b at the second end are respectively sleeved with the fourth collars 205, so that the movable connection of the first fixing needle 208 and the third fixing needle 204 with the connecting rods 302 is realized.

First fixed needle 208 is located metatarsal both sides and is bent with the pincers of bending and form first lantern ring 207 of sheep eye circle structure, the third fixed needle is located the shin bone both sides and is bent with the pincers of bending and form the fourth lantern ring 205 of sheep eye circle structure, connecting rod 302 both ends are bent with the pincers of bending and are formed second lantern ring 303a and third lantern ring 303b of sheep eye circle structure, the operation process is convenient simple, overlap between sheep eye circle and the sheep eye circle takes, and can use the size of the pincers adjustment sheep eye circle of bending as required, in order to inject space range of motion.

It can be understood that after the first collar 207 and the second collar 303a are sleeved, a gap is left between the collars, and this gap is a limited range of motion of the first fixing pin 208 and the connecting rod 302. Similarly, after the fourth sleeve ring 205 is sleeved with the third sleeve ring 303b, a gap is left between the sleeve rings, and the gap is the limited movable range of the third fixing needle 204 and the connecting rod 302, so that the limb can be fixed in the limited movable range, and the joint can still move, namely, the problems of joint stiffness complication and broken achilles tendon anastomosis and surrounding tissue adhesion caused by complete fixation and loss of movement of the joint are avoided, and the limb can be fixed in a limited range to prevent the broken repaired and sutured achilles tendon from breaking.

In some embodiments, as shown in fig. 3 and 6, at least portions of both ends of the first fixing pin 208 located outside the metatarsal bone 10 are bent to form two first connection parts 102, a portion of the second fixing pin 206 is inserted into the calcaneus bone 20, both ends of the second fixing pin 206 are located outside the calcaneus bone 20, at least portions of both ends of the second fixing pin 206 located outside the calcaneus bone 20 are bent to form two second connection parts 103, and the first connection parts 102 and the second connection parts 103 are connected to form the first fixture 100.

In this embodiment, two ends of the first fixing pin 208 are bent toward the direction of the root bone 20 to form two first connecting portions 102, two ends of the second fixing pin 206 are bent toward the direction of the metatarsal bone 10 to form two second connecting portions 103, the two first connecting portions 102 are respectively connected with the two second connecting portions 103 on the same side of the limb to form the first fixing frame 100, the first connecting portions 102 and the second connecting portions 103 on two sides of the limb facilitate the connection between the first fixing pin 208 and the second fixing pin 206 to form the first fixing frame 100, the joint between the first fixing pin and the second fixing pin is a gluing handle for fixing the frame of the root bone and the metatarsal bone, because the diameter of the fixing pin is small, and in order to bend easily, the common rigidity is poor, forming the frame structure is favorable for enhancing the structural rigidity. When tension is applied to the achilles tendon by applying the first fixing needle 208 through the connecting rod 302 with the third fixing needle 204 as a base point, the first fixing needle 208 is prevented from being deformed to cause fixing failure in such a manner that the first fixing needle 208 and the second fixing needle 206 form a frame structure.

In one embodiment, the first fixture 100 is a rectangular frame structure. The part of the first fixing pin 208 located inside the metatarsal bone 10 is parallel to the part of the second fixing pin 206 located inside the metatarsal bone 20, two ends of the first fixing pin 208 are bent towards the direction of the metatarsal bone 20 for 90 degrees to form two first connecting parts 102, two ends of the second fixing pin 206 are bent towards the direction of the metatarsal bone 10 for 90 degrees to form two second connecting parts 103, the first connecting parts 102 are connected with the second connecting parts 103, and at this time, the first fixing frame 100 is in a rectangular frame structure. The first fixing pins 208 and the second fixing pins 206 are arranged in a frame parallel to each other, so that the traction and the twist between the metatarsal bones 10 and the radicular bones 20 can be reduced, and the formed first fixing frame 100 is more stable. The first connecting part 102 and the second connecting part 103 which are parallel to each other are connected to enable acting force to be collinear, torsion in other directions is not generated, and unnecessary damage to the fixing part of the bone-anchoring needle is reduced.

In some embodiments, the first connecting portion 102 is bonded to the second connecting portion 103 to form the first fixing frame 100. At least a part of the first connecting part 102 and the second connecting part 103 are overlapped, the overlapped parts of the first connecting part 102 and the second connecting part 103 are jointed, dental light-curing glue is coated on the jointed part, and then the first connecting part 102 and the second connecting part 103 are bonded to form the first fixing frame 100 after being cured by ultraviolet light irradiation. And the bonding area can be increased by increasing the overlapping part of the first connecting part 102 and the second connecting part 103, so that the bonding stability of the two parts is increased, and a fixing frame gluing handle can be formed, which is beneficial to increasing the structural strength of the rectangular frame.

In the fixing device for repairing the broken achilles tendon in the embodiment, the first end of the connecting rod 302 is connected with the first fixing needle 208, and after the second end of the connecting rod 302 is connected with the third fixing needle 204, the length of the connecting rod 302 is not adjustable, and the fixing device for repairing the broken achilles tendon is generally used in the healing period of suture of the broken achilles tendon operation, and the fixing effect on the achilles tendon is more emphasized in the period, so that only two ends of the connecting rod 302 are set to be movably connected, and the fixing device for repairing the broken achilles tendon in the healing period can meet the requirement by having a smaller movable range.

In some embodiments, the length of the connecting rod 302 of the fixing device for repairing the achilles tendon rupture after being connected with the first fixing needle 208 and the third fixing needle 204 can be adjusted, and the fixing device for repairing the achilles tendon rupture can be generally used for the later healing period of the achilles tendon rupture. Specifically, as shown in fig. 5-8, the connecting rod 302 includes first and

second segments

312a, 312b and a sleeve connector 304, at least portions of the first and

second segments

312a, 312b being positioned within the sleeve connector 304 and connected by the sleeve connector 304 such that the connecting rod 302 is adjustable in length.

In this embodiment, the sleeve connector 304 is preferably made of stainless steel sheet, which prevents damage caused by animal bite when the fixing device of the present application is used on experimental animals. One end of the first and

second segments

312a, 312b is disposed within the sleeve connector 304, and the length of the first and

second segments

312a, 312b within the sleeve connector 304 is adjustable, which allows the length of the connecting rod 302 to be adjustable.

It will be appreciated that the length of the connecting rod 302 is the sum of the lengths of the first section 312a, the sleeve connector 304, and the second section 312b, minus the length of the overlap. The shorter the length of the first section 312a and the second section 312b within the sleeve connector 304, the shorter the overlap, the longer the length of the connecting rod 302; the longer the length of the first section 312a and the second section 312b within the sleeve connector 304, the longer the overlap, and the shorter the length of the connecting rod 302. That is, the first section 312a and the second section 312b of the connecting rod 302 can change the length of the connecting rod 302 by changing the length of the connecting rod which extends into the sleeve connector 304, so that the length of the connecting rod 302 can be adjusted, when the fixing device is applied to fixing the Achilles tendon, the fixing device is fixed on the limb needing to be fixed, the length of the connecting rod 302 can be changed without disassembling the connecting rod 302, and the stress applied to the Achilles tendon can be adjusted to change the length of the connecting rod at different healing stages.

The fixing device in this embodiment has an adjustable tension range for the stress load fixed to the Achilles tendon, and realizes that different fixing ranges are given to the Achilles tendon in the healing process of the Achilles tendon. That is, there is a range of gradients that can be adjusted for a fixed tension of the Achilles tendon over time. The tension is improved along with the continuation of the healing stage, so that the repaired achilles tendon can be functionally healed, and the achilles tendon after rehabilitation has the original strength.

It can be understood that the first end of the connecting rod 302 is movably connected to the first fixing pin 208, the second end is movably connected to the third fixing pin 204, the first fixing pin 208 is fixed to the metatarsal bone 10, the second fixing pin 206 is fixed to the root bone 20, and the third fixing pin 204 is fixed to the tibia 30. This makes the distance between the fixing point of the first fixing pin 208 on the metatarsal 10 and the fixing point of the third fixing pin 204 on the tibia 30 adjustable. Due to the anatomical structure of the tibia, the metatarsus 10 and the metatarsus 20 are connected into a whole and can be regarded as a plate body of a 'seesaw', an ankle joint at the far end of the tibia can be regarded as a fulcrum of the 'seesaw', the plate body can rotate around the fulcrum, and the achilles tendon is pulled by the metatarsus 20 to be tensioned, wherein the tension is related to the ankle joint fulcrum angle at the far end of the tibia and the metatarsus 20. The length of the connecting rod 302 is adjustable, the angle between the "seesaw" plate body formed by integrating the metatarsus 10 and the root bone 20 and the ankle joint fulcrum is adjustable, the angle of the metatarsus 10 driving the root bone 20 to rotate is adjustable, and the tension of the achilles tendon is adjustable.

Because the tibia 30, the radicle 20, the metatarsal bone 10 and the connecting rod 302 form a triangular structure together, the angle of the tibia 30 and the calcaneus 20 can be adjusted by adjusting the length of the connecting rod 302; namely, the length of the hypotenuse of the triangle is adjusted, namely the length of the Achilles tendon at the opposite hypotenuse can be adjusted.

In some embodiments, as shown in fig. 5-8, at least portions of the first and

second segments

312a, 312b are externally threaded, and the sleeve connector 304 is internally threaded, the internal threads mating with the external threads to threadably connect the first and

second segments

312a, 312b to the sleeve connector 304 to form the adjustable length connecting rod 302.

In this embodiment, the ends of the first section 312a and the second section 312b are provided with external threads, and the threads on the first section 312a and the second section 312b are opposite in direction, so that when the sleeve connector 304 is rotated, the first section 312a and the second section 312b move simultaneously in the direction inside the sleeve connector 304 or simultaneously move in the direction outside the sleeve connector 304, thereby realizing the length adjustment of the connecting rod 302. The first section 312a and the second section 312b can be inserted into the interior of the sleeve connector 304 in the axial direction of the sleeve connector 304 or removed from the interior of the sleeve connector 304 in the axial direction of the sleeve connector 304 when rotated relative to the sleeve connector 304.

Therefore, the first segment 312a and the second segment 312b are connected by the screw thread, so that the first segment 312a and the second segment 312b always move along the axial direction of the sleeve connector 304, and the dislocation of the first segment 312a and the second segment 312b can be prevented, thereby avoiding the uncontrolled fixing of the Achilles tendon.

Specifically, the outer side of the sleeve connector 304 may be provided with a tab-shaped handle 305, by which the sleeve connector 304 is manually rotated to adjust the length of the connecting rod 302 is facilitated by the tab-shaped handle 305.

In other embodiments, as shown in fig. 9, the two ends of the sleeve connector 304 are further connected with a limiting member 402, and at least a portion of the limiting member 402 is located in the sleeve connector 304; the sleeve connector 304 is provided with an elastic member 404, the first segment 312a and the second segment 312b penetrate through the limiting member 402 and are connected with the elastic member 404 to form a connecting rod 302 with adjustable length, and the limiting member 402 is used for limiting the elastic member 404 from extending out of the sleeve connector 304.

In this embodiment, the first segment 312a and the second segment 312b are not threaded, smoothly pass through the limiting member 402, and are connected to the elastic member 404 to form a connecting rod 302 with an elastic range length. An elastic member 404 is arranged in the sleeve connector 304, the elastic member 404 is preferably a spring, the limiting members 402 are located at two ends of the sleeve connector 304 and are used for blocking the spring in the sleeve connector 304, the first section 312a and the second section 312b respectively penetrate through the limiting members 402 located at two ends of the sleeve connector 304 and are connected with the elastic member 404, and the connection modes of the first section 312a and the second section 312b with the elastic member 404 may be welding, sleeving, bonding or the like, and are not particularly limited in this embodiment. The extension range of the elastic member 404 is limited by the limiting member 402 within the sleeve connector 304, which makes the length of the connecting rod 302 within the limited range, and the limiting member 402 is provided with a through hole parallel to the axis of the sleeve connector 304, through which the first segment 312a and the second segment 312b pass to connect with the elastic member 404. Thus, the first section 312a and the second section 312b are constrained to move in the direction of the axis of the sleeve connector 304, preventing the first section 312a and the second section 312b from becoming misaligned, which could result in uncontrolled anchorage of the Achilles tendon.

The elastic member 404 is adopted to connect the first section 312a and the second section 312b, so as to apply a symmetrical stress degree under the natural weight to the Achilles tendon, namely, so-called flexible fixation, thereby indirectly realizing the natural elastic stress of the Achilles tendon in the postoperative rehabilitation healing period of the fractured Achilles tendon, and obtaining the clinically expected rehabilitation environment of flexible fixation of the fractured Achilles tendon repair.

Specifically, as shown in fig. 9, the stopper 402 is adhesively connected to the sleeve connector 304. At least the position of the limiting member 402 is disposed in the sleeve connector 304, the overlapping portion of the limiting member 402 and the sleeve connector 304 is coated with metal glue, the limiting member 402 and the sleeve connector 304 are fixed together, and the length of the overlapping portion of the limiting member 402 and the sleeve connector can be adjusted before bonding, so that the movable range of the elastic member 404 can be adjusted.

In some embodiments, as shown in fig. 2, 3, 5 and 6, the second fixing frame 101 further includes a fourth fixing pin 202 disposed parallel to and spaced apart from the third fixing pin 204, a portion of the third fixing pin 204 penetrates the tibia 30, both ends of the third fixing pin 204 are located outside the tibia 30, and at least a portion of both ends of the third fixing pin 204 located outside the tibia 30 is used for bending to form two third connecting portions 104; a part of the fourth fixing pin 202 penetrates through the tibia 30, two ends of the fourth fixing pin 202 are located outside the tibia 30, at least part of two ends of the fourth fixing pin 202 located outside the tibia 30 are used for bending to form two fourth connecting portions 105, and the third connecting portion 104 and the fourth connecting portions 105 are connected to form the second fixing frame 101.

In this embodiment, by providing the third fixing pin 204 and the fourth fixing pin 202, the second fixing frame 101 is fixed at two points through the tibia, and compared with the second fixing frame 101 formed by only one pin of the third fixing pin 204, the second fixing frame 101 formed by the third fixing pin 204 and the fourth fixing pin 202 has higher strength in the double-pin structure, and is more stable for anchoring the tibia, so as to avoid the situation that the tibia is injured due to too much stress at the local fixing position of the tibia when the tibia is fixed at one point. And the second fixing frame can play a good supporting and drawing role on the first support in the fixing device, so that the fixing stability of the fixing device is improved.

Two ends of the third fixing pin 204 are bent towards the fourth fixing pin 202 to form two third connecting parts 104, two ends of the fourth fixing pin 202 are bent towards the third fixing pin 204 to form two fourth connecting parts 105, the two third connecting parts 104 are respectively connected with the two fourth connecting parts 105 on the same side of the limb to form a tibia fixing frame gluing handle, the diameter of the fixing pin is smaller, and the rigidity is usually poorer in order to bend easily, the formation of a frame structure is favorable for enhancing the structural stability, the fixing frame gluing handle formed by overlapping and gluing the third connecting parts 104 and the fourth connecting parts 105 strengthens the rigidity of the fixing frame, and the deformation caused fixing failure is prevented.

In some embodiments, the distance between the third fixing pin 204 and the first fixing frame 100 is smaller than the distance between the fourth fixing pin 202 and the first fixing frame 100. The third fixing pin 204 is located closer to the first fixing frame 100, which makes the length of the connecting rod 302 shorter, enhances the structural rigidity of the fixing device, and prevents the fixing device from deforming to cause fixing failure.

In some embodiments, as shown in fig. 3 and 6, the middle portions of the first, second, third and fourth fixation needles 208, 206, 204 and 202 are provided with threaded segments 203, and the threaded segments 203 are used for anchoring bone. The fixing needle adopts a titanium alloy fixing needle with percutaneous puncture capability, the fixing needle is a rhombus bone penetrating fixing needle with a sharp blade at the end part, the needle is used for direct percutaneous puncture, and the middle thread section 203 is directly anchored into the cortical bone base in a rotating manner after penetrating through the bone and is fixed with the bone base. The metatarsal bone 10 is anchored through the threaded section 203 in the middle of the first fixing needle 208, the root bone 20 is anchored through the threaded section 203 in the middle of the second fixing needle 206, the tibia 30 is anchored through the threaded sections 203 in the middle of the third fixing needle 204 and the fourth fixing needle 202, the anchoring force between the first fixing needle 208, the second fixing needle 206, the third fixing needle 204 and the fourth fixing needle 202 and the bone is increased through the threaded sections 203 in the middle of the third fixing needle 204 and the fourth fixing needle 202, and the phenomenon that the first fixing needle 208, the second fixing needle 206, the third fixing needle 204 and the fourth fixing needle 202 are loosened from the bone in the fixing process can be prevented.

In a second embodiment of the present application, a fixing method using the fixing device of the first aspect is provided, in which the first ends of the two connecting rods 302 are respectively formed with a second collar 303a, and the second ends of the two connecting rods 302 are respectively formed with a third collar 303b, and the fixing method includes the following steps:

the first fixing pin 208 passes through the metatarsal bone 10, the middle part of the pin is left in the metatarsal bone 10, and the two ends of the pin extend out of the metatarsal bone 10;

the first fixing pin 208 located outside the metatarsal bone 10 passes through the second loop 303a at the first end of the connecting rod 302 and is bent to form the first loop 207, so that the second loop 303a is locked;

the third fixing pin 204 passes through the tibia 30, the middle part of the third fixing pin is left in the tibia 30, and two ends of the third fixing pin extend out of the tibia 30;

the third fixing pin 204 located outside the tibia 30 passes through the third collar 303b at the second end of the connecting rod 302, and is bent to form a fourth collar 205, so that the third collar 303b is locked;

the second fixing pin 206 passes through the root bone 20 with the middle portion remaining in the root bone 20 and both ends protruding out of the root bone 20;

the portion of the first fixing pin 208 located outside the metatarsal bone 10 and the portion of the second fixing pin 206 located outside the radicular bone 20 are connected.

In the fixing method provided by the embodiment of the application, the first fixing pin 208 is inserted into the metatarsal bone 10, the second fixing pin 206 is inserted into the radicle 20, the third fixing pin 204 is inserted into the tibia 30, the second loop 303a at one end of the connecting rod 302 is movably connected with the first loop 207 formed by bending the first fixing pin 208, and the second loop 303a at the other end of the connecting rod 302 is movably connected with the fourth loop 205 formed by bending the third fixing pin 204. The portion of the first fixing pin 208 located outside the metatarsal bone 10 and the portion of the second fixing pin 206 located outside the radicular bone 20 are connected.

Therefore, the tibia 30, the root bone 20, the metatarsal bones 10 and the connecting rod 302 form a triangular structure together, and the achilles tendon is fixed indirectly by means of fixation of related limb joint bones, so that the condition that a suture port of the broken achilles tendon is not healed due to incomplete fixation is avoided; and, adopt lantern ring structure swing joint, limbs are injectd and are moved in controllable activity range, can prevent the prosthetic complete fixation of achilles tendon fracture and lose the joint stiffness complication that the activity degree caused, compare with the structure of complete fixation, adopt lantern ring structure swing joint, can also reduce the secondary fracture that the maloperation leads to.

In some embodiments, the step of connecting the portion of the first fixing pin 208 located outside the metatarsal bone 10 and the portion of the second fixing pin 206 located outside the radicle 20 is:

the remaining portion of the first fixing pin 208 located outside the metatarsal bone 10 is bent 90 ° with respect to the portion located inside the metatarsal bone 10;

the portion of the second fixing pin 206 located outside the root bone 20 is bent by 90 ° with respect to the portion of the portion left inside the root bone 20;

the bent portions of the first fixing pin 208 and the second fixing pin 206 are connected.

In the present embodiment, the remaining portion of the first fixing pin 208 located outside the metatarsal bone 10 is bent by 90 ° with respect to the portion located inside the metatarsal bone 10, and the portion of the second fixing pin 206 located outside the metatarsal bone 20 is bent by 90 ° with respect to the portion located inside the metatarsal bone 20, and the bent portions are connected, so that a rectangular frame structure is formed, which has better structural rigidity and prevents deformation from causing fixing failure.

In some embodiments, the two connecting rods 302 are length-adjustable connecting rods 302, each of the two connecting rods 302 includes a first section 312a and a second section 312b, and the steps of forming the length-adjustable connecting rods 302 are as follows:

rotating and screwing the first section 312a having an external thread into the socket connector 304 from one end of the socket connector 304 having an internal thread and the second section 312b having an external thread into the socket connector 304 from the other end of the socket connector 304 having an internal thread, the length of the connecting rod 302 being controlled by controlling the length of the rotating and screwing; further, when the connecting rod 302 is assembled, the thread directions of the first section 312a and the second section 312b are opposite, at least a portion of the first section 312a and the second section 312b is screwed into the sleeve connector 304, and the length of the connecting rod 302 is controlled by rotating the sleeve connector 304;

or, the connecting rod 302 further includes an elastic member 404 and a limiting member 402, the elastic member 404 is first placed inside the sleeve connector 304, the first section 312a and the second section 312b are respectively inserted into the sleeve connector 304 from two ends of the sleeve connector 304 and abut against the elastic member 404, two ends of the sleeve connector 304 are blocked by the limiting member 402, and the elastic member 404 is prevented from being removed from the sleeve connector 304. For example, when the limiting member 402 is an annular limiting member, the limiting member can be installed before the first segment 312a and the second segment 312b are installed, and when the limiting member 402 is a seal-strip-shaped limiting member, the limiting member can be installed after the first segment 312a and the second segment 312b are installed.

In the related technology, for the research on repairing the broken achilles tendon, three methods, namely coating and fixing by using a plaster sleeve, binding and fixing by using a plastic outer splint and fixing by using a Ke's nail through a bone rigid frame, are commonly adopted in a multi-experimental animal surgical repairing and fixing method.

The gypsum sleeve is fixed in a solidification coating mode, the operation controllability is poor, and the experiment is difficult to be repeated in a standard mode; the experimental animal is worn for a long time after operation, the normal activity, diet and rest of the animal are greatly influenced, and the interference of experimental data is great.

The plastic outer splint is bound and fixed, the operation is complicated, the fixation is unstable, and the fixation fails in the middle of the experiment; and the external splint is bound and fixed, which greatly bears the burden of fixing the animal after the operation.

The Ke's nail penetrates through the bone rigid frame for fixation, the joint fixed to the Ke's nail completely loses the mobility, and the joint is stiff as a result; after operation, the tendon is fixed and the tension is unchanged, and the tendon tissue loses stress in the healing and rehabilitation process of the broken and sutured tendon, namely, the tendon muscle atrophy and the muscle tissue adipogenesis of the tendon can be inevitably generated; the repaired achilles tendon loses the original tendon strength function.

According to the application, the first fixing needle 208, the second fixing needle 206, the third fixing needle 204 and the fourth fixing needle 202 are made of titanium alloy steel wires to form a mitsubishi surface bone penetrating fixing needle with a sharp edge, and the middle section of the needle rod is partially provided with a threaded section 203. The needle is used for direct percutaneous puncture, the threaded section 203 at the middle section of the needle rod is directly and rotatably anchored into the cortical bone matrix after penetrating through the bone, and the needle point is cut off and discarded. The two ends of the bone fixing needle extending out and remaining outside the bone are bent for 90 degrees by using special bending forceps.

The connecting rod 302 is made of titanium alloy steel wire, the second collar 303a is made of a first end of the connecting rod 302 by using a bending clamp, and the third collar 303b is made of a second end of the connecting rod 302 by using a bending clamp. The second collar 303a at the first end of the connecting rod 302 is butted against the first collar 207, and the third collar 303b at the second end is butted against the fourth collar 205. The lantern ring is connected to have a limited space, and the purpose of the limited space is to rock in order to provide an actual gap so as to realize that the limb fixation after the achilles tendon rupture repair operation can achieve small movement under large fixation, namely the ideal requirement of external fixation after the achilles tendon rupture operation with movement in the middle and the predetermined in the middle can prevent the joint from being stiff.

Use the fixed needle of first fixed needle 208, the fixed needle 206 of second, the fixed needle 204 of third and the fixed needle 202 of fourth of titanium alloy steel wire preparation to and connecting rod 302, for using the gypsum material, carrying out the achilles tendon fixed back to the experimental animal, titanium alloy steel wire hardness is higher, can prevent that the experimental animal from gnawing the damage that causes, influence the experiment process to fixing device. And the titanium alloy steel wire is small in size and light, and the influence on the normal activities, diet and rest of experimental animals is reduced.

The limited fixing technology of controllable space motion range with variable size is provided by adopting a lantern ring movable connection mode, so that joint stiffness complication caused by fixing of achilles tendon fracture repair can be prevented; in addition, the fixing technology of adjustable fixing tension, namely the length, the length and the tightness of the repair bits of the Achilles tendon is realized, and the requirement of specified stress load can be met in the healing process after the Achilles tendon operation; in addition, the tension spring is used for controlling, the achilles tendon is loosened and tightened to a symmetrical stress degree under the natural weight, namely the flexible fixation, so that the tendon has a natural body elastic tension requirement in the later period of tendon injury restoration.

With the three significant characteristics, the broken achilles tendon can be recovered to the original degree of tendon-tendon combination and tendon-bone combination so as to have the normal physiological function of the original achilles tendon.

The above description is only a preferred embodiment of the present application, and is not intended to limit the scope of the present application. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims

1. A fixing device for repairing ruptured achilles tendon is characterized by comprising a first fixing frame (100), a second fixing frame (101) and at least two connecting rods (302) which are arranged at intervals along the width direction (W) of the fixing device;

the first fixing frame (100) comprises a first fixing needle (208) and a second fixing needle (206) which are fixedly connected with each other, the first fixing needle (208) is used for penetrating and fixing the metatarsal bones (10), and the second fixing needle (206) is used for penetrating and fixing the metatarsal bones (20); the second fixing frame (101) at least comprises a third fixing needle (204), and the third fixing needle (204) is used for penetrating and fixing the tibia (30);

the first ends of the two connecting rods (302) are respectively movably connected with the two ends of the first fixing needle (208); the second ends of the two connecting rods (302) are movably connected with the two ends of the third fixing needle (204) respectively, and the connecting rods (302) are matched with the first fixing frame (100) and the second fixing frame (101) to fix the achilles tendon.

2. The fixing device for achilles tendon fracture repair according to claim 1, wherein a middle portion of the first fixing needle (208) is inserted into the metatarsal bone (10), and both ends of the first fixing needle (208) are located outside the metatarsal bone (10), and both ends of the first fixing needle (208) are respectively formed with a first collar (207);

second lantern rings (303 a) are respectively formed at first ends of the two connecting rods (302), and the first ends of the two connecting rods (302) are movably connected with two ends of the first fixing needle (208) through the second lantern rings (303 a) and the first lantern ring (207);

the middle part of the third fixing needle (204) penetrates through the tibia (30), two ends of the third fixing needle (204) are located outside the tibia (30), and fourth lantern rings (205) are formed at two ends of the third fixing needle (204) respectively;

second ends of the two connecting rods (302) are respectively provided with a third lantern ring (303 b), and the second ends of the two connecting rods (302) are respectively movably connected with two ends of the third fixing needle (204) through the third lantern ring (303 b) and the fourth lantern ring (205).

3. A fixation device for achilles tendon fracture repair according to claim 2, characterized in that at least part of both ends of the first fixation needle (208) located outside the metatarsal (10) is adapted to be bent to form two first connection portions (102);

a part of the second fixing needle (206) penetrates through the root bone (20), two ends of the second fixing needle (206) are located outside the root bone (20), at least part of two ends of the second fixing needle (206) located outside the root bone (20) is used for bending to form two second connecting portions (103), and the first connecting portion (102) is connected with the second connecting portions (103) to form the first fixing frame (100).

4. A fixation device for achilles tendon fracture repair as claimed in claim 3, wherein the first fixation frame (100) is a rectangular frame structure.

5. A fixation device for achilles tendon fracture repair as claimed in claim 3, wherein the first connection portion (102) is bonded to the second connection portion (103) to form the first fixation frame (100).

6. The fixation device for achilles tendon fracture repair according to any one of claims 1 to 5, wherein the connecting rod (302) comprises a first section (312 a) and a second section (312 b) and a sleeve connector (304), at least a portion of the first section (312 a) and the second section (312 b) being located within the sleeve connector (304) and connected by the sleeve connector (304) such that the length of the connecting rod (302) is adjustable.

7. The fixation device for achilles tendon fracture repair according to claim 6, wherein at least a portion of the first section (312 a) and the second section (312 b) are provided with external threads, and the sleeve connector (304) is provided with internal threads which cooperate with the external threads to threadedly connect the first section (312 a) and the second section (312 b) with the sleeve connector (304) to form the connecting rod (302) with adjustable length.

8. The fixation device for achilles tendon fracture repair as claimed in claim 6, wherein a stop member (402) is further connected to both ends of the sleeve connector (304), at least a portion of the stop member (402) being located within the sleeve connector (304);

an elastic piece (404) is arranged in the sleeve connector (304), the first section (312 a) and the second section (312 b) penetrate through the limiting piece (402) and are connected with the elastic piece (404) to form the connecting rod (302) with adjustable length, and the limiting piece (402) is used for limiting the elastic piece (404) to extend out of the sleeve connector (304).

9. The fixation device for achilles tendon fracture repair of claim 8, wherein the stop member (402) is adhesively connected to the sleeve connector (304).

10. The fixing device for achilles tendon fracture repair according to any one of claims 1 to 5, wherein the second fixing frame (101) further comprises a fourth fixing needle (202) arranged in parallel with the third fixing needle (204) at a spacing, a part of the third fixing needle (204) is inserted into the tibia (30), both ends of the third fixing needle (204) are located outside the tibia (30), and at least a part of both ends of the third fixing needle (204) located outside the tibia (30) is used for bending to form two third connecting parts (104);

a part of the fourth fixing pin (202) penetrates through the tibia (30), two ends of the fourth fixing pin (202) are located outside the tibia (30), at least part of two ends of the fourth fixing pin (202) located outside the tibia (30) is used for bending to form two fourth connecting portions (105), and the third connecting portion (104) and the fourth connecting portions (105) are connected to form a second fixing frame (101).

11. Fixing device for achilles tendon rupture repair according to claim 10, characterized in that the distance between the third fixing needle (204) and the first fixing frame (100) is smaller than the distance between the fourth fixing needle (202) and the first fixing frame (100).

12. A fixation device for achilles tendon rupture repair as claimed in claim 10, characterized in that the middle of the first (208), second (206), third (204) and fourth (202) fixation needles is provided with a threaded section (203), the threaded section (203) being used for anchoring bone.