An internal fixation device for hallux valgus treatment and an internal fixation kit for hallux valgus treatment

Abstract

The internal fixation device for hallux valgus treatment comprises a working sleeve provided with a working threaded hole, a working member along its axial direction, a threaded rod capable of being threadedly connected with the working threaded hole, and a fixing rod with an outer diameter larger than the threaded rod, the fixing rod being coaxially arranged with the threaded rod, a nail head with a beveled proximal end surface, a distal end connected with the end of the fixing rod through a ball hinge structure, a ball center of the ball hinge structure coinciding with the axis of the working member, the nail head being provided with a first tool channel, a ball head in the ball hinge structure being provided with a second tool channel, the first tool channel and the second tool channel being coaxially arranged and communicated when the nail head is coaxial with the working member, and a torsion tool being capable of being torque transmission connected with the threaded rod through the first tool channel and the second tool channel to threadedly connect the threaded rod with the working threaded hole, control the deflection angle of the nail head, make the nail head flush with the metatarsal bone surface, control the gap between the two metatarsal bone fracture bones, and reduce the metatarsal bone shortening degree after the operation.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of hallux valgus treatment, and particularly relates to an internal fixation device for hallux valgus treatment and an internal fixation kit for hallux valgus treatment. BACKGROUND

[0002] Hallux valgus is a common foot deformity, mainly characterized by outward deviation of the big toe (hallux) and protrusion of the first metatarsal bone (a foot bone connecting the big toe) to the inside, forming a joint deformity, causing pain in the forefoot when walking, especially when wearing narrow shoes, and even causing stiffness of the big toe, affecting normal walking or movement.

[0003] For patients with moderate or severe hallux valgus or ineffective conservative treatment, surgical treatment can be adopted, such as Chevron osteotomy (suitable for IMA < 15°), Scarf osteotomy (IMA 15-20°), and Lapidus operation (IMA > 20° or joint instability).

[0004] The internal fixation device for treating hallux valgus includes a metatarsal bone internal fixation plate and a cannulated screw.

[0005] The installation process of the phalangeal internal fixation plate requires incision of the skin, and the wound is large, the blood supply of the foot skin and soft tissue is poor, and poor healing of the incision is easy to occur. The internal fixation plate is located between the thin layer of skin and the bone surface, and the skin on the surface of the internal fixation plate is easy to be pressed and necrotized for a long time, affecting the healing of the surgical area. The fixation strength of the internal fixation plate is low, and the anti-rotation ability is limited, and bone end displacement is easy to occur. The internal fixation plate lacks elasticity, and stress shielding of the osteotomy end is easy to occur, affecting the healing of the osteotomy end.

[0006] The first phalangeal proximal orthopedic surgery uses a cannulated screw for fixation, and the anti-rotation ability of the osteotomy surface is poor. When inserted obliquely, the tail of the screw is easy to protrude from the bone cortex plane, causing extrusion to the surface skin and causing local pain in the patient, and even leading to necrosis of the surface skin. The screw fixation also has the problem of stress shielding affecting the healing of the osteotomy end. After the cannulated screw is inserted, in order to prevent the tail from protruding from the bone surface, it needs to be screwed into the bone, and completely embedded. This will increase the difficulty of taking out the cannulated screw from the metatarsal bone.

[0007] In addition, the surgical incision at the metatarsal bone is small. When the cannulated screw is implanted, the needle insertion angle of the cannulated screw needs to ensure that the cannulated screw can accurately connect the metatarsal bone fracture, and also needs to ensure that the twisting tool has enough space to connect with the cannulated screw, and uses the threads on the cannulated screw to drive the stable advancement of the cannulated screw into the metatarsal bone. The surgical incision restricts the needle insertion angle of the cannulated screw, thereby increasing the difficulty of the surgery.

[0008] If the fractured bones are directly connected by rigid fixation, when the patient's toes are stressed, the gap between the fractured bones is difficult to adjust, causing a large stress at the connection between the screw and the fractured bone, thereby affecting the healing of the bone fracture end. SUMMARY

[0009] In order to reduce the stress shielding caused by rigid internal fixation to the osteotomy site, avoid the problem of non-union of the osteotomy, prevent the rotation and displacement of the bone surface at the osteotomy, and avoid the protrusion of the internal fixation device relative to the metatarsal bone surface, which has a strong irritation to the skin, and in order to reduce the influence of the surgical incision on the nail angle, when fixing the broken bone, the internal fixation device is at the limit of the nail angle, the driving tool can still drive the internal fixation device to rotate and advance in the metatarsal bone through the internal fixation device. The application provides an internal fixation device for hallux valgus treatment and an internal fixation kit for hallux valgus treatment.

[0010] An internal fixation device for hallux valgus treatment, comprising: a working sleeve provided with a working threaded hole; a working piece along its axial direction, comprising a threaded rod capable of being threadedly connected with the working threaded hole and a fixed rod with an outer diameter larger than the threaded rod, the fixed rod being coaxially arranged with the threaded rod; a nail head, the proximal end surface of which is beveled, and the distal end thereof is connected with the end of the fixed rod through a ball hinge structure, the ball center of the ball hinge structure coincides with the axis of the working piece, the nail head is provided with a first tool channel, the ball head in the ball hinge structure is provided with a second tool channel, when the nail head is coaxial with the working piece, the first tool channel and the second tool channel are coaxially arranged and communicated, a torsion tool can reach the working piece through the first tool channel and the second tool channel and be in torque transmission connection with the threaded rod to make the threaded rod rotate and be threadedly connected with the working threaded hole.

[0011] After the metatarsal bone is cut off, the metatarsal bone can be divided into two parts with the osteotomy site as the dividing point. The working sleeve is implanted in one part and the working piece is implanted in the other part. Then the threaded rod of the working piece is threadedly connected with the working sleeve, and when the working piece rotates relative to the working sleeve, it can pull the two parts of the metatarsal bone cut off close together, so that the two osteotomy ends can abut against each other, creating better healing conditions for the osteotomy ends. After connecting the two broken bones together, the deflection direction of the nail head can be adjusted according to the outer surface of the bone, so that the tail end of the nail head can be as close as possible to the bone surface, avoiding the exposure of the nail head to the bone cortex surface, the outward lifting of the skin wrapped around the metatarsal bone, and the compression of the skin. Due to the shielding of the nail head, the internal fixation device will not be completely embedded during bone growth. When the internal fixation device is removed from the metatarsal bone, the working sleeve and the working piece can be removed from the healed metatarsal bone through the nail head.

[0012] In an embodiment of the application, the threaded rod is fixedly connected with the fixed rod.

[0013] In an embodiment of the application, the external thread of the threaded rod and the internal thread of the working threaded hole can be clearance fit in the axial direction of the working sleeve, so that when the threaded rod is threadedly connected with the working threaded hole, the working piece can move axially relative to the working sleeve.

[0014] The bone itself has elasticity, so when the metatarsal bone is subjected to stretching or extrusion in the length direction, the metatarsal bone will elastically deform slightly, and the outer thread of the threaded segment and the inner thread of the working thread hole are clearance fitted in the axial direction of the working sleeve, so that the working piece can move slightly axially relative to the working sleeve to adapt to the slight change in the length of the metatarsal bone, avoid the situation that the length of the combination of the working sleeve and the working piece in the metatarsal bone cannot change to adapt to the length change of the metatarsal bone, and damage the metatarsal bone

[0015] In an embodiment of the present application, the hallux valgus treatment internal fixation device further comprises two locking screws; the side wall of the fixed rod is provided with a first fixing hole, one of the locking screws can be connected with the first fixing hole; the side wall of the threaded rod is provided with a first connecting hole, the side wall of the working sleeve is provided with a second connecting hole penetrating the working sleeve, the second connecting hole is communicated with the working thread hole, when the threaded rod is screwed with the working thread hole and reaches the connecting position relative to the working thread hole, the first connecting hole is communicated with the second connecting hole; the first connecting hole is a long hole, and its extension direction is parallel to the axial direction of the threaded rod, and the other locking screw can be connected with the first connecting hole through the second connecting hole.

[0016] The interlocking structure formed by the two locking screws and the working sleeve and the working piece respectively enables the working sleeve to be firmly connected with one of the broken bones, the fixed rod of the working piece to be connected with the other broken bone, and avoids the working sleeve and the working piece from rotating in the broken bone, and since the first connecting hole is a long hole, the locking screw does not limit the slight relative axial movement of the threaded rod relative to the working sleeve.

[0017] In an embodiment of the present application, the threaded rod is rotationally connected with the fixed rod, and the fixed rod is provided with a third tool channel in the axial direction thereof; when the nail head is coaxial with the working piece, the torque transmission tool can be connected with the end of the threaded rod through the first tool channel, the second tool channel and the third tool channel.

[0018] By rotationally connecting the threaded rod with the fixed rod and by the way that the outer diameter of the fixed rod is greater than the outer diameter of the threaded rod, the effect that the fixed rod does not rotate in the broken bone, and the threaded rod rotates in the nail channel relative to the fixed rod and is screwed with the working sleeve can be achieved. Avoiding the situation that the fixed rod excessively rotates in the broken bone, reduces the friction between the fixed rod and the nail channel, and reduces the fixing effect of the nail channel on the fixed rod.

[0019] In one embodiment of the present application, the side wall of the fixed rod is provided with a first fixed hole in communication with the third tool channel; the thread angle between the threaded rod and the working threaded hole is greater than the friction angle; the side wall of the threaded rod is provided with a first connecting hole, and the side wall of the working sleeve is provided with a second connecting hole penetrating through the working sleeve, the second connecting hole being in communication with the working threaded hole, the first connecting hole being in communication with the second connecting hole when the threaded rod is threadedly connected with the working threaded hole and reaches the connecting position relative to the working threaded hole, the first connecting hole being a long hole provided in the side wall of the threaded rod; the hallux valgus treatment internal fixation device further comprises two interlocking screws, one of which is connected with the first fixed hole, and the other of which is connected through the first connecting hole and the second connecting hole, and the first connecting hole has an extension direction parallel and perpendicular to the axis of the threaded rod, so that the threaded rod can still rotate around its axis in the working threaded hole when the interlocking screw passes through the first connecting hole and the second connecting hole to form an interlocking structure.

[0020] By means of the first connecting hole having an extension direction parallel and perpendicular to the axis of the threaded rod, when the interlocking screw passes through the first connecting hole and the second connecting hole to form an interlocking structure, the interlocking screw does not prevent the threaded rod from rotating slightly through the first connecting hole, thereby allowing the fixed rod and the working sleeve to move slightly axially.

[0021] In one embodiment of the present application, the hallux valgus treatment internal fixation device further comprises two elastic washers, one of which is arranged between the fixed rod and the working sleeve when the working threaded hole is connected with the threaded rod, and the other of which is arranged at the bottom of the working threaded hole.

[0022] The elastic washer between the fixed rod and the working sleeve is used to buffer the impact force when they are close to each other, and the elastic washer at the bottom of the working threaded hole is used to limit the excessive rotation of the threaded rod and buffer the impact force when the threaded rod is rotated.

[0023] In one embodiment of the present application, the working threaded hole includes a threaded fitting section, a containing section and a terminal section along its depth direction, the containing section is provided with an elastic sleeve coaxially arranged in the containing section, and the elastic sleeve is fixedly arranged in the containing section; the threaded rod includes a threaded section, a sleeve fitting section and a limiting section in sequence from the proximal end of the threaded rod to the distal end of the threaded rod, the threaded section is capable of being threadedly connected with the threaded fitting section, the limiting section is capable of reaching the terminal section through the internal passage of the threaded fitting section and the elastic sleeve, the elastic sleeve is sleeved on the sleeve fitting section, and the outer diameter of the limiting section and the outer diameter of the threaded section are both greater than the outer diameter of the sleeve fitting section and the inner diameter of the elastic sleeve.

[0024] The elastic sleeve can be elastically deformed when the fixing rod approaches the working sleeve, thereby forming a buffering effect. When the distance between the fixing rod and the working sleeve is reduced or increased, the shaft shoulder at the connection between the threaded segment and the sleeve fitting segment and the shaft shoulder at the connection between the limiting segment and the sleeve fitting segment extrude the elastic sleeve, and the elastic sleeve is elastically deformed, thereby forming the buffering effect to avoid the influence of external force on the healing of the osteotomy end.

[0025] In an embodiment of the present application, the elastic sleeve is an absorbable elastic sleeve, and the inner wall of the accommodating segment is provided with a release hole in communication with the outside.

[0026] By adopting the absorbable elastic sleeve, the elastic sleeve can be absorbed by the human body as the osteotomy of the patient gradually recovers, so that the elastic sleeve no longer limits the fixing rod from moving away from the fixing sleeve. After a period of time, the axial distance between the fixing rod and the working sleeve can be increased, thereby facilitating the removal of the hallux valgus treatment internal fixation device.

[0027] The internal fixation kit for hallux valgus treatment comprises an internal fixation device for hallux valgus treatment, which is characterized by a working sleeve provided with a working threaded hole; a working member along its axial direction, which comprises a threaded rod capable of being threadedly connected with the working threaded hole and a fixed rod with an outer diameter larger than the threaded rod, the fixed rod being coaxially arranged with the threaded rod; a nail head, the proximal end surface of which is beveled, and the distal end of which is connected with the end of the fixed rod through a ball joint structure, the ball center of the ball joint structure coincides with the axis of the working member, the nail head is provided with a first tool channel, the ball head in the ball joint structure is provided with a second tool channel, when the nail head is coaxial with the working member, the first tool channel and the second tool channel are coaxially arranged and communicated, a torsion tool can reach the working member through the first tool channel and the second tool channel and be in torque transmission connection with the threaded rod to make the threaded rod rotate and be threadedly connected with the working threaded hole; the threaded rod is in rotational connection with the fixed rod, the fixed rod is provided with a third tool channel along its axial direction; when the nail head is coaxial with the working member, the torsion tool can be in torque transmission connection with the end of the threaded rod through the first tool channel, the second tool channel and the third tool channel. The side wall of the fixed rod is provided with a first fixed hole communicated with the third tool channel; the thread rise angle between the threaded rod and the working threaded hole is larger than the friction angle; the side wall of the threaded rod is provided with a first connecting hole, the side wall of the working sleeve is provided with a second connecting hole penetrating through the working sleeve, the second connecting hole is communicated with the working threaded hole, when the threaded rod is in threaded connection with the working threaded hole and reaches a connecting position relative to the working threaded hole, the first connecting hole is communicated with the second connecting hole, the first connecting hole is a long hole arranged on the side wall of the threaded rod; the internal fixation device for hallux valgus treatment further comprises two interlocking screws, one of which is connected with the first fixed hole, the other of which is connected through the first connecting hole and the second connecting hole, and the first connecting hole has an extension direction parallel and perpendicular to the axis of the threaded rod, so that when the interlocking screw passes through the first connecting hole and the second connecting hole, the threaded rod can still rotate in the working threaded hole around its axis. The internal fixation kit for hallux valgus treatment further comprises a first sighting bracket and a second sighting bracket; the first sighting bracket comprises a first fixing part capable of being connected with the end of the threaded rod through the first tool channel, the second tool channel and the third tool channel, and further comprises a first sighting arm provided with a first sighting hole matched with the first connecting hole; the second sighting bracket comprises a second fixing part capable of being connected with the fixed rod through the first tool channel and the second tool channel, and further comprises a second sighting arm provided with a second sighting hole matched with the first fixed hole. BRIEF DESCRIPTION OF DRAWINGS

[0028] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The detailed description is made with reference to the accompanying drawings.

[0029] Figure 1 is a structural schematic diagram of an illustrative embodiment of the application;

[0030] Figure 2 is a structural schematic diagram of an illustrative embodiment of the application when the threaded rod is engaged with the working threaded hole;

[0031] Figure 3 is a structural schematic diagram of an illustrative embodiment of the application when the distal end of the nail head is provided with a ball head;

[0032] Figure 4 is a structural schematic diagram of an illustrative embodiment of the application when the two metatarsal bone fractures are respectively provided with a working member and a working sleeve;

[0033] Figure 5 is a structural schematic diagram of an illustrative embodiment of the application when the two metatarsal bone fractures are connected together through the joint action of the working member and the working sleeve;

[0034] Figure 6 is a structural schematic diagram of an illustrative embodiment of the application when the first connecting hole is a long hole;

[0035] Figure 7 is a structural schematic diagram of an illustrative embodiment of the application when the ball head is provided with a driving tooth;

[0036] Figure 8 is a structural schematic diagram of an illustrative embodiment of the application when the torsion tool is engaged with the driving tooth;

[0037] Figure 9 is a structural schematic diagram of an illustrative embodiment of the application when an elastic washer 402 is arranged between the end face of the fixing rod and the end face of the working sleeve;

[0038] Figure 10 is a structural schematic diagram of an illustrative embodiment of the application when the first connecting hole is a long hole;

[0039] Figure 11 is a structural schematic diagram of an illustrative embodiment of the application when the plurality of interlocking screws are connected with the fixing rod, the threaded rod, and the working sleeve;

[0040] Figure 12 is a structural schematic diagram of an illustrative embodiment of the application when the interlocking screws are connected with the two metatarsal bone fractures;

[0041] Figure 13 is a structural schematic diagram of an illustrative embodiment of the application when the threaded rod is rotationally connected with the fixing rod;

[0042] Figure 14This is a schematic structural diagram of one embodiment of the threaded rod and fixed rod rotatably connected in this application, where the first connecting hole is an elongated hole;

[0043] Figure 15 This is a schematic structural diagram of one embodiment of the threaded rod in this application;

[0044] Figure 16 This is a schematic structural diagram of one embodiment of the present application where an elastic sleeve is provided within the receiving section;

[0045] Figure 17 This is a schematic structural diagram of one embodiment of the present application with two elastic washers 402;

[0046] Figure 18 This is a schematic structural diagram of one embodiment of the first aiming frame in this application;

[0047] Figure 19 This is a schematic structural diagram of one embodiment of the second aiming frame in this application;

[0048] Figure 20 This is a schematic diagram of a structural embodiment in which the working sleeve of this application has an arc-shaped shape.

[0049] Label Explanation:

[0050] 101. Nail head; 102. Mating surface; 103. First tool channel; 104. Ball head; 105. Second tool channel; 106. Drive groove; 107. Drive tooth;

[0051] 201. Working part; 202. Fixed rod; 203. Threaded rod; 204. Threaded section; 205. Sleeve mating section; 206. Restricting section; 207. First fixing hole; 208. First connecting hole; 209. Third tool channel; 210. External thread;

[0052] 301. Working sleeve; 302. Working threaded hole; 303. Threaded mating section; 304. Receiving section; 305. End section; 306. Second connecting hole; 307. Release hole;

[0053] 401. Locking screw; 402. 402 elastic washer; 403. Elastic sleeve;

[0054] 501. First aiming frame; 502. First fixing part; 503. First aiming arm; 504. First aiming hole;

[0055] 601. Second aiming frame; 602. Second fixing part; 603. Second aiming arm; 604. Second aiming hole;

[0056] 701, metatarsal bone; 702, torsion tool. DETAILED DESCRIPTION

[0057] In order to make the technical features, objectives and effects of the present application clearer, the specific embodiments of the present application will be described below with reference to the drawings, wherein the same reference numbers represent the same or similar parts having the same function.

[0058] In the present document, "schematic" means "serving as an example, instance or illustration", and any illustration or embodiment described as "schematic" in the present document should not be interpreted as a more preferred or more advantageous technical solution.

[0059] For the sake of simplicity of the drawings, only the parts related to the present application are shown in the drawings, which do not represent the actual structure of the product. In addition, for the sake of simplicity and easy understanding of the drawings, in some drawings, only one of the parts having the same structure or function is shown schematically, or only one of them is labeled.

[0060] Herein, "proximal end" refers to the end of the medical device close to the operator, and "distal end" refers to the end close to the patient's body.

[0061] Please refer to Figures 1 to 20 to understand the present application.

[0062] Please refer to Figure 1 , the internal fixation device for hallux valgus treatment comprises a nail head 101, a working piece 201 and a working sleeve 301.

[0063] Please refer to Figure 1 , along the axial direction of the working piece 201, the working piece 201 comprises a threaded rod 203 provided with external threads 210 and a fixed rod 202 with an outer diameter larger than that of the threaded rod 203, and the fixed rod 202 is coaxially arranged with the threaded rod 203. When the working piece 201 is arranged in the nail channel established in the metatarsal bone fracture, the working piece 201 is coaxially arranged with the nail channel, and the fixed rod 202 can abut against the inner wall of the nail channel. Since the outer diameter of the threaded rod 203 is smaller than that of the fixed rod 202, the threaded rod 203 does not abut against the inner wall of the nail channel, thereby avoiding scratching the inner wall of the nail channel when the external threads 210 of the threaded rod 203 rotate.

[0064] Please refer to Figure 2 , along the axial direction of the working sleeve 301, the working sleeve 301 is provided with a working threaded hole 302, and the working threaded hole 302 is provided with internal threads, and the working threaded hole 302 can be threadedly connected with the threaded rod 203.

[0065] Please refer to Figure 1, the proximal end face of the nail head 101 is a matching face 102, the matching face 102 is inclined relative to the axis of the nail head 101, the matching face 102 is a bevel, after the installation of the hallux valgus treatment internal fixation device, the nail head 101 can swing, so that the matching face 102 is in close contact with the metatarsal bone surface, reduces the protrusion of the nail head 101 relative to the bone cortex surface, and reduces the pressure on the skin. The distal end of the nail head 101 is connected with the end of the fixed rod 202 through a ball hinge structure, see Figure 2 , the ball center of the ball hinge structure coincides with the axis of the working piece 201, the nail head 101 is provided with a first tool channel 103, and the ball head 104 in the ball hinge structure is provided with a second tool channel 105. Those skilled in the art to which the present application pertains can understand that the ball head 104 of the ball hinge structure in the present application can be arranged at the fixed rod 202, and the ball socket of the ball hinge structure can be arranged at the distal end of the nail head 101, or as shown in Figure 3 , the ball head 104 of the ball hinge structure is arranged at the distal end of the nail head 101, and the ball socket of the ball hinge structure is arranged at the proximal end of the fixed rod 202.

[0066] Referring to Figure 2 , when the nail head 101 is coaxial with the working piece 201, the first tool channel 103 and the second tool channel 105 are coaxially arranged and communicated, the twisting tool 702 can reach the working piece 201 through the first tool channel 103 and the second tool channel 105, and is in torque transmission connection with the threaded rod 203, so as to make the threaded rod 203 rotate and be in threaded connection with the working threaded hole 302.

[0067] Referring to Figure 4 、 Figure 5 , when the hallux valgus treatment internal fixation device is used, the working piece 201 can be arranged in a nail channel of one metatarsal bone fracture, the working sleeve 301 can be arranged in a nail channel of another metatarsal bone fracture, and the fixed rod 202 and the working sleeve 301 are tightly connected with the two nail channels respectively by using friction or using medical glue and the like. Subsequently, the twisting tool 702 drives the threaded rod 203 to rotate and be in threaded connection with the working threaded hole 302, so that the two metatarsal bone fractures can gradually approach, and the two bone fracture ends can approach each other.

[0068] Because the traditional osteotomy adopts a ring saw or a swing saw to cut the bone tissue, the bone tissue is lost, and the metatarsal bone 701 is shortened after the osteotomy. The threaded rod 203 and the working sleeve 301 are connected through the threaded connection, the depth of the threaded rod 203 into the working threaded hole 302 is adjusted, the distance between the two metatarsal bone fractures is adjusted, and a certain gap is reserved between the two metatarsal bone fractures according to the patient condition and the operation condition. The new bone tissue can fill the gap between the two metatarsal bone fractures after healing, and the degree of shortening of the metatarsal bone 701 after the operation is reduced. The working sleeve 301 and the threaded rod 203 are connected with the metatarsal bone fracture through the interlocking screw 401 to form an interlocking structure, see Figure 6 The threaded rod 203 and the working sleeve 301 are connected through the threaded connection, the depth of the threaded rod 203 into the working threaded hole 302 is adjusted, the distance between the two metatarsal bone fractures is adjusted, and a certain gap is reserved between the two metatarsal bone fractures according to the patient condition and the operation condition. The new bone tissue can fill the gap between the two metatarsal bone fractures after healing, and the degree of shortening of the metatarsal bone 701 after the operation is reduced. The working sleeve 301 and the threaded rod 203 are connected with the metatarsal bone fracture through the interlocking screw 401 to form an interlocking structure, see Figure 19 The threaded rod 203 and the working sleeve 301 are connected through the threaded connection, the depth of the threaded rod 203 into the working threaded hole 302 is adjusted, the distance between the two metatarsal bone fractures is adjusted, and a certain gap is reserved between the two metatarsal bone fractures according to the patient condition and the operation condition. The new bone tissue can fill the gap between the two metatarsal bone fractures after healing, and the degree of shortening of the metatarsal bone 701 after the operation is reduced. The working sleeve 301 and the threaded rod 203 are connected with the metatarsal bone fracture through the interlocking screw 401 to form an interlocking structure, see

[0069] After the implantation of the internal fixation device for hallux valgus treatment is completed, the nail head 101 is connected with the fixed rod 202 through the ball joint structure, so that the nail head 101 can be deflected relative to the fixed rod 202, and the matching surface 102 can be as flat as possible with the surface of the metatarsal bone 701, and the angle of the nail head 101 relative to the metatarsal bone 701 is fixed by medical glue or other fillers. By adjusting the angle of the nail head 101, the degree of exposure of the nail head 101 relative to the surface of the metatarsal bone 701 can be reduced, and the degree of compression of the skin by the nail head 101 can be reduced. Due to the shielding of the nail head 101, the metatarsal bone 701 tissue at the opening of the nail channel will not embed the nail head 101 when it grows, avoiding the situation that the working sleeve 301, the working piece 201 and the nail head 101 can be removed after the nail channel is established again. When the internal fixation device for hallux valgus treatment is taken out of the nail channel, the position can also be found through the nail head 101, and after the nail head 101 leaves the nail channel, the angle of the nail head 101 relative to the fixed rod 202 can be adjusted according to the situation, so that the working piece 201 and the working sleeve 301 can be completely taken out of the nail channel by applying force to the nail head 101.

[0070] The way to realize the torque transmission connection between the twisting tool 702 and the threaded rod 203 has many ways. For example, when the threaded rod 203 is fixedly connected with the fixed rod 202, as shown in Figure 2 , the proximal end of the fixed rod 202 is provided with a ball head 104, the second tool channel 105 in the ball head 104 is coaxially arranged with the fixed rod 202, and the second tool channel 105 is formed with a driving groove 106 matched with the twisting tool 702. When the nail head 101 is coaxial with the fixed rod 202, the twisting tool 702 can be torque transmission connected through the first tool channel 103, the second tool channel 105 and the driving groove 106, and the threaded rod 203 is driven by the fixed rod 202 to rotate around the axis of the threaded rod 203. Alternatively, as shown in Figure 3 , the ball head 104 is arranged at the distal end of the nail head 101, the ball socket is arranged at the proximal end of the fixed rod 202, and the proximal end of the fixed rod 202 is also provided with a driving groove 106 in communication with the ball socket. The twisting tool 702 can be torque transmission connected through the first tool channel 103, the second tool channel 105 and the driving groove 106, and the threaded rod 203 is driven by the fixed rod 202 to rotate around the axis of the threaded rod 203. Of course, when the threaded rod 203 is fixedly connected with the fixed rod 202, it is not limited to the coaxial arrangement of the nail head 101 and the fixed rod 202, and the torque transmission connection between the twisting tool 702 and the threaded rod 203 through the first tool channel 103 and the second tool channel 105 can be realized, as shown in Figure 7 , Figure 8 , the ball socket of the ball joint structure is arranged at the nail head 101, the first tool channel 103 is in communication with the ball socket, the proximal end of the fixed rod 202 is provided with the ball head 104 of the ball joint structure, as shown in Figure 7, the ball head 104 is hollow, the inner cavity of the ball head 104 forms part of the second tool channel 105, and the second tool channel 105 is communicated with the outside, and the driving teeth 107 are arranged along the circumference of the second tool channel 105 at the position where the second tool channel 105 is communicated with the outside, when the end of the twist tool 702 is inserted into the ball head 104, the twist tool 702 can be inclined relative to the workpiece 201, and the side edges of the twist tool 702 can be clamped between the driving teeth 107, and the twist tool 702 can be deviated from the axis of the second tool channel 105, and the ball head 104 is driven to rotate by the driving teeth 107, so that the ball head 104 arranged at the proximal end of the fixed rod 202 drives the fixed rod 202, the threaded rod 203 to rotate, and the threaded section 204 can be screwed with the work threaded hole 302. Of course, there are other ways to realize the torque transmission connection between the twist tool 702 and the threaded rod 203, for example, the fixed rod 202 and the threaded rod 203 are coaxially arranged and rotationally connected, the twist tool 702 can pass through the fixed rod 202 and be directly torque transmission connected with the proximal end of the threaded rod 203, see Figure 13 , which will be described below.

[0071] The present application can also realize the slight axial movement of the fixed rod 202 relative to the work sleeve 301.

[0072] In an embodiment of the present application, see Figure 9When the fixed rod 202 and the threaded rod 203 are fixedly connected, the external thread 210 of the threaded rod 203 and the internal thread of the working threaded hole 302 can be clearance fit in the axial direction of the working sleeve 301, so that when the threaded rod 203 is screwed with the working threaded hole 302, the threaded rod 203 and the working sleeve 301 can move axially relative to each other due to the clearance between the external thread 210 of the threaded rod 203 and the internal thread of the working threaded hole 302, the threaded rod 203 can move axially relative to the working sleeve 301, and the working piece 201 including the threaded rod 203 and the fixed rod 202 can move axially relative to the working sleeve 301, so that the fixed rod 202 can move towards or away from the working sleeve 301 in the axial direction of the working sleeve 301, realizing that the fixed rod 202 can move axially by a small amount relative to the working sleeve 301. This is to adapt to the change in length of the metatarsal bone 701 when the metatarsal bone 701 is subjected to stretching or extrusion in its length direction and the metatarsal bone 701 undergoes elastic deformation due to its own elasticity, so that the length of the combination of the working piece 201 and the working sleeve 301 can also change due to the axial movement of the fixed rod 202 relative to the working sleeve 301, thereby adapting to the small change in length of the metatarsal bone 701 when subjected to external force, avoiding the situation that the working piece 201 and the working sleeve 301 in the metatarsal bone 701 cannot adapt to the small change in length of the metatarsal bone 701, and the working piece 201 and the working sleeve 301 rigidly contact the metatarsal bone 701 in the nail channel, thereby damaging the metatarsal bone 701.

[0073] In order to make the fixed rod 202, the threaded rod 203 and the working sleeve 301 more firmly connected with the two metatarsal bone fractures, the hallux valgus treatment internal fixation device further comprises two interlocking screws 401, which can be connected with the fixed rod 202 and the working sleeve 301 respectively.

[0074] Referring to Figures 10 to 12 The side wall of the fixed rod 202 is provided with a first fixing hole 207, and when the working piece 201 is screwed with the working sleeve 301, one of the interlocking screws 401 is used to pass through one of the metatarsal bone fractures, the first fixing hole 207 and is connected with the first fixing hole 207, so as to firmly connect the fixed rod 202 with the metatarsal bone fracture through the interlocking screw 401, avoiding the movement and rotation of the fixed rod 202 in the nail channel established in the metatarsal bone fracture.

[0075] The side wall of the threaded rod 203 is provided with a first connecting hole 208, the side wall of the working sleeve 301 is provided with a second connecting hole 306 penetrating the working sleeve 301, the second connecting hole 306 is in communication with the working threaded hole 302, when the threaded rod 203 is screwed with the working threaded hole 302 and reaches the connecting position relative to the working threaded hole 302, the first connecting hole 208 and the second connecting hole 306 can be in communication, and the first connecting hole 208 is a long hole (see Figure 10 ), and the extension direction of the first connecting hole 208 is parallel to the axial direction of the threaded rod 203, the second connecting hole 306 is a round hole matched with the interlocking screw 401, which can be seen from Figure 9 、 Figure 10 , and the other interlocking screw 401 can be connected through the second connecting hole 306, the first connecting hole 208 and the metatarsal bone 701, the second connecting hole 306 can be a light hole or a threaded hole, the interlocking screw 401 penetrating the second connecting hole 306 can prevent the working sleeve 301 from moving or rotating in the nail channel, so that the position of the working sleeve 301 in the metatarsal bone fracture nail channel is fixed. The external thread 210 of the threaded rod 203 and the internal thread of the working threaded hole 302 can be gap-fitted, so that the threaded rod 203 can have a slight axial movement relative to the working sleeve 301, while the first connecting hole 208 is a long hole, and since the threaded rod 203 is screwed with the working threaded hole 302, the extension direction of the first connecting hole 208 is parallel to the axial direction of the working sleeve 301, and then when the interlocking screw 401 penetrates the first connecting hole 208, the first connecting hole 208 can still move relative to the interlocking screw 401, and the interlocking screw 401 will not prevent the threaded rod 203 from moving axially relative to the working sleeve 301, so that when the interlocking screw 401 fixes the two metatarsal bone fractures with the working sleeve 301 and the fixed rod 202 respectively, the interlocking screw 401 will not hinder the movement of the working sleeve 301 and the fixed rod 202, and will not limit the slight movement between the two metatarsal bone fractures, and the two metatarsal bone fractures can move closer to each other or farther away from each other, and through the interlocking screw 401, the connection stability and firmness of the working member 201, the working sleeve 301 and the two metatarsal bone fractures are ensured, and the application can also adapt to the slight length change of the combination of the two metatarsal bone fractures.

[0076] Those skilled in the art to which the present application pertains can understand that there are other ways to realize the slight axial movement of the fixed rod 202 and the working sleeve 301, so that the slight distance change between the metatarsal bone fractures connected with the fixed rod 202 and the working sleeve 301 respectively can be realized, which will be described in detail below.

[0077] The connection mode of the fixed rod 202 and the threaded rod 203 in the present application is not only limited to the fixed connection mode of the fixed rod 202 and the threaded rod 203 described above, but also can be the rotary connection mode of the fixed rod 202 and the threaded rod 203 mentioned above, which can be seen fromFigure 13 The threaded rod 203 is coaxially arranged with the fixed rod 202 and rotationally connected. The fixed rod 202 is provided with a third tool channel 209 along the axial direction thereof. When the nail head 101 is coaxial with the working member 201, the torque transmission connection can be achieved between the torsion tool 702 and the end of the threaded rod 203 through the first tool channel 103, the second tool channel 105 and the third tool channel 209. See Figure 13 The end of the proximal end of the threaded rod 203 is provided with a driving groove 106, which can be matched with the torsion tool 702 to achieve the torque transmission connection. Of course, a driving protrusion can be arranged at the proximal end of the threaded rod 203 to achieve the torque transmission connection with the torsion tool 702. Of course, other implementation modes for achieving the torque transmission connection between the torsion tool 702 and the proximal end of the threaded rod 203 are also available, which will not be described herein. Since the fixed rod 202 and the threaded rod 203 are rotationally connected, when the threaded rod 203 is driven to rotate by the torsion tool 702, the fixed rod 202 cannot rotate in the nail channel established in the metatarsal fracture, and the working sleeve 301 cannot rotate in the nail channel of the other metatarsal fracture, so that the fixed rod 202 and the working sleeve 301 cannot excessively scratch the nail channel due to the rotation thereof, thereby reducing the damage to the bone at the inner wall of the nail channel. Since the outer diameter of the threaded rod 203 is smaller than the outer diameter of the fixed rod 202, the external thread 210 will not cause the rotary cutting of the nail channel when the threaded rod 203 rotates, thereby further protecting the bone at the nail channel.

[0078] When the fixed rod 202 and the threaded rod 203 are rotationally connected, the axial movement of the fixed rod 202 relative to the working sleeve 301 can also be achieved. The thread angle between the threaded rod 203 and the working thread hole 302 is greater than the friction angle. When the thread angle is greater than the friction angle, the threaded connection is not self-locking, and the threaded rod 203 is allowed to rotate to adjust the position, so that the thread between the two loses the self-locking ability. When the two metatarsal bones 701 are close to or away from each other due to the external force, the fixed rod 202 and the working sleeve 301 connected to the two metatarsal fractures have the tendency to be close to or away from each other, so that the threaded rod 203 can rotate relative to the working thread hole 302, and the fixed rod 202 can be close to or away from the working sleeve 301.

[0079] Further, in order to prevent the threaded rod 203 from excessively rotating and to strengthen the connection between the threaded rod 203, the working sleeve 301 and the two metatarsal fractures, the side wall of the threaded rod 203 is provided with a first connecting hole 208, and the side wall of the working sleeve 301 is provided with a second connecting hole 306 penetrating the working sleeve 301. The second connecting hole 306 is in communication with the working thread hole 302. When the threaded rod 203 is threadedly connected with the working thread hole 302 and reaches the connecting position relative to the working thread hole 302, the first connecting hole 208 is in communication with the second connecting hole 306. The first connecting hole 208 is a long hole arranged on the side wall of the threaded rod 203. SeeFigure 13 、 Figure 14 , the first connecting hole 208 has an extending direction parallel to and perpendicular to the axis of the threaded rod 203, the second connecting hole 306 is a light hole matched with the interlocking screw 401 or a threaded hole capable of being threadedly connected with the interlocking screw 401, the interlocking screw 401 can pass through the second connecting hole 306 to lock the position of the working sleeve 301 in the nail channel. The application also comprises an interlocking screw 401, the interlocking screw 401 can pass through the second connecting hole 306 and the first connecting hole 208, and since the outer diameter of the interlocking screw 401 is smaller than the length and width of the first connecting hole 208, even if the interlocking screw 401 passes through the first connecting hole 208, the first connecting hole 208 can still move slightly relative to the interlocking screw 401, when the threaded rod 203 slightly rotates in the working threaded hole 302 around its own axis, the interlocking screw 401 does not immediately abut against the inner wall of the first connecting hole 208 to limit the rotation of the threaded rod 203, until the rotation of the threaded rod 203, the inner wall of the first connecting hole 208 abuts against the interlocking screw 401, so that the interlocking screw 401 limits the threaded rod 203 to continue to rotate in the working threaded hole 302, thereby limiting the relative axial movement between the fixed rod 202 and the working sleeve 301. Therefore, the interlocking screw 401 not only has the effect of strengthening the connection between the working sleeve 301 and the metatarsal bone 701, but also has the effect of preventing the threaded rod 203 from excessively rotating in the working threaded hole 302.

[0080] Of course, when the fixed rod 202 is rotationally connected with the threaded rod 203, the fixed rod 202 can also have the first fixed hole 207 capable of being connected with the interlocking screw 401, the side wall of the fixed rod 202 is provided with the first fixed hole 207 communicated with the third tool channel 209, an interlocking screw 401 can pass through the metatarsal bone 701 and the first fixed hole 207 to lock the position of the fixed rod 202 in the nail channel, so that the fixed rod 202 can be stably connected with the metatarsal bone fracture, and since the first fixed hole 207 is communicated with the third tool channel 209, the interlocking screw 401 does not pass through the threaded rod 203 when passing through the first fixed hole 207, so that the interlocking screw 401 passing through the first fixed hole 207 does not limit the rotation of the threaded rod 203, so that when the threaded rod 203 slightly rotates, the fixed rod 202 and the working sleeve 301 can slightly move relative to each other in the axial direction.

[0081] The above describes the technical solution that when the fixed rod 202 and the threaded rod 203 are fixedly connected, and the fixed rod 202 and the threaded rod 203 are rotationally connected, and the threaded rod 203 is threadedly connected with the working threaded hole 302 of the working sleeve 301, the fixed rod 202 can still move axially relative to the working sleeve 301 to adapt to the slight change in length of the metatarsal bone 701 composed of two metatarsal bone fractures during the healing process. In order to protect the newly formed bone tissue at the junction of the metatarsal bone fractures, the present application also provides an elastic body to reduce the impact of the working sleeve 301 and the fixed rod 202 on the inside of the metatarsal bone fractures when the fixed rod 202 moves axially relative to the working sleeve 301, and to share the boundary force acting on the junction of the two metatarsal bone fractures. The specific setting mode of the elastic body is described below.

[0082] Referring to Figure 15 , the working threaded hole 302 along its depth direction includes a threaded matching section 303, a receiving section 304, and a terminal section 305, referring to Figure 16 , the receiving section 304 is provided with an elastic body coaxially arranged in the receiving section 304 and fixedly arranged in the receiving section 304, the elastic body being an elastic sleeve 403, the elastic sleeve 403 being fixedly arranged in the receiving section 304 in multiple ways, such as referring to Figure 15 , the inner diameter of the receiving section 304 is greater than the inner diameters of the threaded matching section 303 and the terminal section 305, the outer diameter of the elastic sleeve 403 can be equal to the inner diameter of the receiving section 304, the hole shoulders of the receiving section 304 and the threaded matching section 303 and the terminal section 305 can limit the movement of the elastic sleeve 403, so that the elastic sleeve 403 is fixedly arranged in the receiving section 304. Of course, the implementation of the elastic sleeve 403 fixedly arranged in the receiving section 304 also has other ways, such as the elastic sleeve 403 being clamped with the inner wall of the receiving section 304 through a clamping structure, of course, there are other implementation ways, which are not described here.

[0083] Referring to Figure 15threaded rod 203 includes a threaded section 204, a sleeve matching section 205 and a limiting section 206 in sequence, the limiting section 206 has a diameter larger than the inner diameter of the elastic sleeve 403 and the outer diameter of the sleeve matching section 205, the threaded section 204 is capable of being threadedly connected with the threaded matching section 303, the limiting section 206 is capable of reaching the terminal section 305 through the threaded matching section 303 and the internal passage of the elastic sleeve 403, the elastic sleeve 403 is sleeved on the sleeve matching section 205, the inner diameter of the elastic sleeve 403 is smaller than the outer diameter of the limiting section 206, when the limiting section 206 at the terminal section 305 moves towards the containing section 304, the elastic sleeve 403 abuts against the shoulder at the joint of the limiting section 206 and the sleeve matching section 205 and elastically deforms, preventing the limiting section 206 from moving towards the containing section 304, because the fixed rod 202 of the working member 201 is fixedly arranged in one of the metatarsal bone fractures and the working sleeve 301 is fixedly arranged in the other metatarsal bone fracture, when a slight movement of moving away from each other occurs between the two metatarsal bone fractures, because the threaded rod 203 is fixedly connected with the fixed rod 202 in the above-mentioned manner, the gap fit between the threaded rod 203 and the threaded matching section 303, or the threaded rod 203 and the threaded matching section 303 lose the self-locking ability in the manner of being rotatably connected with the fixed rod 202, the threaded rod 203 is capable of moving axially relative to the working threaded hole 302, so as to Figure 16 in the direction described above, the limiting section 206 of the threaded rod 203 is capable of moving left and right in the working threaded hole 302, because the outer diameter of the limiting section 206 is larger than the outer diameter of the sleeve matching section 205 and the inner diameter of the elastic sleeve 403, when the shoulder at the limiting section 206 and the sleeve matching section 205 moves to the right, it can abut against the end face of the elastic sleeve 403, so that the elastic sleeve 403 elastically deforms, the elastic sleeve 403 has a buffering effect, when the metatarsal bone fractures are subjected to stretching, it can share the force that causes the two metatarsal bone fractures to move away from each other, reducing the force at the joint of the two metatarsal bone fractures, and the distance between the fixed rod 202 and the working sleeve 301 can also change with the length change of the metatarsal bone 701, so as to better protect the bone tissue at the joint of the two metatarsal bone fractures. Because the relative axial position between the fixed rod 202 and the working sleeve 301 can change slightly, the gap between the two metatarsal bone fractures can change slightly, adapting to the slight length change of the metatarsal bone 701 caused by the growth of new bone-like tissue, avoiding the situation that the fixed rod 202 and the working sleeve 301 cannot move slightly relative to each other, the distance between the two metatarsal bone fractures cannot change slightly, and the growth of new bone-like tissue between the two metatarsal bone fractures is inhibited.

[0084] Further, the outer diameter of the limiting section 206 gradually decreases in the axial direction away from the sleeve fitting section 205, so that the limiting section 206 can more easily pass through the elastic sleeve 403 and reach the terminal section 305.

[0085] When the workpiece 201 and the work sleeve 301 are taken out, the threaded rod 203 can be rotated out of the work sleeve 301 by a part, so that the nail head 101 enters the outside world from the nail channel, thereby facilitating the taking out of the workpiece 201 and the work sleeve 301 through the nail head 101. In an embodiment of the present application, the elastic sleeve 403 is an absorbable elastic sleeve 403, which can be made of polyglycolide, or PLCL, or modified PLCL, or other materials. The elastic sleeve 403 has elasticity and absorbability; see Figure 16 The inner wall of the containing section 304 is provided with a release hole 307 in communication with the outside world, and the elastic sleeve 403 can exchange substances with the human environment through the release hole 307. With the passage of time, the elastic force of the elastic sleeve 403 gradually decreases, and when the two metatarsal fracture junctions are subjected to external forces, the buffering effect provided by the elastic sleeve 403 decreases. With the passage of time, the new bone tissue needs to adapt to the gradually increasing external forces, and gradually strengthens the bearing capacity of the new bone tissue, which is beneficial to enhance the stability of the bone, so that the absorbability of the elastic sleeve 403 can help the patient gradually adapt to the healing of the metatarsal bone 701. On the other hand, with the degradation of the elastic sleeve 403, the elastic sleeve 403 is no longer limited by the limiting section 206 to rotate the threaded rod 203 out of the work threaded hole 302, so that the nail head 101 at the proximal end of the fixed rod 202 enters the outside world from the nail channel, facilitating the medical staff to take out the workpiece 201 and the work sleeve 301 from the metatarsal bone 701 through the nail head 101.

[0086] Of course, the elastic sleeve 403 can also provide cushioning when the fixed rod 202 approaches the work sleeve 301. Further, the outer diameter of the threaded section 204 is greater than the inner diameter of the elastic sleeve 403 and the outer diameter of the sleeve fitting section 205, so that the shaft shoulder at the connection between the threaded section 204 and the sleeve fitting section 205 can abut against the end face at the other end of the elastic sleeve 403, so that the elastic sleeve 403 can be prevented from rotating with the threaded rod 203, and the threaded section 204 can be prevented from rotating with the sleeve fitting section 205. Figure 16The direction in the figure is expressed, when the metatarsal bone 701 is subjected to the extrusion force, the threaded segment 204 moves left relative to the working sleeve 301, so that the elastic sleeve 403 can be elastically deformed, the elastic sleeve 403 forms a buffer, reduces the extrusion effect of the two metatarsal bone fracture joints, and better promotes the healing of the metatarsal bone 701. And the elastic sleeve 403 can have absorbability, over time, the elasticity of the elastic sleeve 403 gradually decreases, so that the external force received by the two metatarsal bone fracture joints will increase, gradually strengthening the bearing capacity of the new bone tissue, and enhancing the stability of the bone.

[0087] Further, in order to ensure that the fixed rod 202 and the working sleeve 301 have a small amount of axial movement, a gap will exist between the distal end face of the fixed rod 202 and the proximal end face of the working sleeve 301. In order to fill the gap, in an embodiment of the present application, when the working threaded hole 302 is connected with the threaded rod 203, an elastic washer 402 is arranged between the distal end face of the fixed rod 202 and the proximal end face of the working sleeve 301. See Figure 16 The elastic washer 402 can be made of rubber, wave-shaped elastic washer, etc.

[0088] For application scenarios that only need to reduce the mutual extrusion effect of the two metatarsal bone fracture joints, the hallux valgus treatment internal fixation device can be provided with two elastic washers 402, which can be rubber washers or wave-shaped elastic washers 402. One of the elastic washers 402 can be arranged at the bottom of the working threaded hole 302, and the other elastic washer 402 can be arranged between the end face of the fixed rod 202 and the end face of the working sleeve 301. See Figure 17 The two elastic washers 402 bear the force that makes the fixed rod 202 approach the working sleeve 301 in the axial direction, thereby reducing the extrusion effect between the two metatarsal bone fractures and avoiding damage to the two metatarsal bone fracture joints due to excessive extrusion force.

[0089] For the mode of implanting the interlocking screw 401 with the fixed connection of the threaded rod 203 and the fixed rod 202, the aiming jig can be directly and rigidly connected with the proximal end of the fixed rod 202, so that the aiming hole of the aiming jig can be aligned with the first connecting hole 208. Due to the characteristics of threaded connection, the threaded rod 203 can be rotated by a certain angle and can enter the working threaded hole 302 to a certain depth, so that the first connecting hole 208 of the threaded rod 203 can be aligned with and communicated with the second connecting hole 306 of the working sleeve 301. Because the aiming hole of the aiming jig can indicate the position of the first connecting hole 208, the interlocking screw 401 can pass through the second connecting hole 306 and be communicated with the first connecting hole 208, thereby connecting the metatarsal bone fracture with the working sleeve 301.

[0090] The thumb hallux valgus treatment internal fixation kit includes the fixed rod 202 and the threaded rod connected with the fixed rod 202, the fixed rod 202 is provided with the first fixed hole 207, the threaded rod 203 is provided with the first connecting hole 208, the thumb hallux valgus treatment internal fixation device is provided with the second connecting hole 306 of the working sleeve 301, the thumb hallux valgus treatment internal fixation device further includes two interlocking screws 401, the thumb hallux valgus treatment internal fixation kit further includes the first sighting bracket 501 and the second sighting bracket 601, the first sighting bracket 501 and the second sighting bracket 601 are used for installing the interlocking screw 401, see Figure 18 , Figure 19 .

[0091] The first sighting bracket 501 includes the first fixed part 502 capable of being connected with the end of the threaded rod 203 through the first tool channel 103, the second tool channel 105 and the third tool channel 209, and further includes the first sighting arm 503 provided with the first sighting hole 504 matched with the first connecting hole 208. Since the final position relationship of the working sleeve and the threaded rod has predictability under the characteristics of the threaded connection, the final position of the threaded rod in the working threaded hole 302 is determinable, and by determining the size matching relationship and the angle matching relationship in advance, when the first fixed part 502 is directly and rigidly connected with the proximal end of the threaded rod 203 at the angle preset in advance, the first sighting hole 504 can aim at the second connecting hole 306 and the first connecting hole 208 communicated with the second connecting hole 306, so that the interlocking screw 401 can be inserted into the second connecting hole 306 and the first connecting hole 208 from outside the body through the first sighting hole 504, realizing the connection of the interlocking screw 401 with the second connecting hole 306 and the first connecting hole 208. The direct and rigid connection mode of the first fixed part 502 with the proximal end of the threaded rod 203 has multiple modes, for example, see Figure 18 , the first fixed part 502 is inserted and matched with the driving groove 106 provided at the end of the threaded rod, the driving groove 106 limits the rotation of the first fixed part 502, and continues to enter the driving groove, so that the position of the first fixed part 502 in the axial and circumferential directions of the threaded rod 203 is determined, so that the first sighting hole 504 can aim at the first connecting hole 208, and further aim at the second connecting hole 306 communicated with the first connecting hole 208. Of course, there are other modes to realize the rigid connection, which will not be described here.

[0092] See Figure 19, the second aiming frame 601 comprises a second fixing part 602 capable of being connected with the fixing rod 202 through the first tool channel 103, the second tool channel 105, and the third tool channel 209, and a second aiming arm 603 provided with a second aiming hole 604 matched with the first fixing hole 207. When the second fixing part 602 is directly and rigidly connected with the fixing rod 202 at a circumferential position of the fixing rod 202 preset in advance, the second aiming hole 604 can be aligned with the first fixing hole 207 through a preset angle and size matching relationship, so that the interlocking screw 401 can enter the first fixing hole 207 through the second aiming hole 604 and be connected with the first fixing hole 207. There are various ways to directly and rigidly connect the second fixing part 602 with the fixing rod 202, for example, referring to Figure 19 , the second fixing part 602 is inserted into the third tool channel 209 and cannot rotate relative to the third tool channel 209, and the hole shoulder limits the second fixing part 602 from continuing to enter the third tool channel 209, so that the position of the second aiming hole 604 and the first fixing hole 207 in the axial direction and the circumferential direction of the fixing rod is determined, so that the second aiming hole 604 aims at the first fixing hole 207. Of course, there are other ways to achieve rigid connection, which will not be described here.

[0093] Although only two interlocking screws 401 connected with the fixing rod 202 and the working sleeve 301 are described above, more interlocking screws 401 can be provided according to actual conditions to strengthen the connection strength of the working piece 201, the working sleeve 301 and the fractured bone. The working piece 201 and the working sleeve 301 can be designed accordingly.

[0094] The specific use mode of the present application can also be other use modes, such as first threadedly connecting the threaded rod 203 and the working sleeve 301, so that the fixing rod 202 and the working sleeve 301 are spaced apart in the axial direction of the threaded rod 203, then connecting the two metatarsal bones in series through the nail channel established on the two metatarsal bones, and then rotating the threaded rod 203 to reduce the axial distance between the fixing rod 202 and the working sleeve 301, so that the cross sections of the two metatarsal bones are close to each other.

[0095] Those skilled in the art to which the present application belongs can understand that the shape of the working sleeve 301 in the present application is not limited to Figure 1 the straight state shown, but can also be Figure 20 the arc-shaped state shown, which can be adapted to the shape of the metatarsal bone, which will not be described here.

[0096] It should be understood that although the present specification is described in terms of various embodiments, each of which describes only one implementation, the specification is intended to cover all possible implementations that are within the scope of the application, which is defined by the claims. One skilled in the art will readily recognize from the disclosure herein, that alternative embodiments of the present application can be constructed from a number of approaches already known in the art, which, if desired, can be selected for the implementation of the techniques described in the specification. Accordingly, the application as set forth is not limited to the embodiments described but is intended to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0097] The detailed description set forth above is merely illustrative of the application and is not intended to limit the scope of the application as defined by the claims. Other modifications of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. Therefore, the scope of the application is intended to be limited only by the claims.

Claims

1. An internal fixation device for hallux valgus treatment, characterized by, It comprises: a working sleeve provided with a working threaded hole; a working piece along its axial direction, which comprises a threaded rod capable of being threadedly connected with the working threaded hole and a fixed rod with an outer diameter larger than the threaded rod, the fixed rod being coaxially arranged with the threaded rod; a nail head with a beveled proximal end surface, and a distal end connected with the end of the fixed rod through a ball hinge structure, the ball center of the ball hinge structure coinciding with the axis of the working piece, the nail head being provided with a first tool channel, the ball head in the ball hinge structure being provided with a second tool channel, the first tool channel and the second tool channel being coaxially arranged and communicated when the nail head is coaxial with the working piece, a torsion tool being capable of reaching the working piece through the first tool channel and the second tool channel and being in torque transmission connection with the threaded rod to make the threaded rod rotate and be threadedly connected with the working threaded hole.

2. The internal fixation device for hallux valgus treatment according to claim 1, wherein the threaded rod is fixedly connected with the fixed rod.

3. The internal fixation device for hallux valgus treatment according to claim 2, wherein the external thread of the threaded rod and the internal thread of the working threaded hole are capable of clearance fit in the axial direction of the working sleeve, so that the working piece is capable of axial movement relative to the working sleeve when the threaded rod is threadedly connected with the working threaded hole.

4. The internal fixation device for hallux valgus treatment according to claim 3, wherein the internal fixation device for hallux valgus treatment further comprises two interlocking screws; the side wall of the fixed rod is provided with a first fixing hole, one of the interlocking screws being capable of being connected with the first fixing hole; the side wall of the threaded rod is provided with a first connecting hole, the side wall of the working sleeve is provided with a second connecting hole penetrating through the working sleeve, the second connecting hole being communicated with the working threaded hole, the first connecting hole being communicated with the second connecting hole when the threaded rod is threadedly connected with the working threaded hole and reaches a connecting position relative to the working threaded hole; the first connecting hole is a long hole, and its extension direction is parallel to the axial direction of the threaded rod, the other interlocking screw being capable of being connected with the first connecting hole through the second connecting hole.

5. The internal fixation device for hallux valgus treatment according to claim 1, wherein the threaded rod is rotationally connected with the fixed rod, the fixed rod being provided with a third tool channel along its axial direction; the torsion tool is capable of being in torque transmission connection with the end of the threaded rod through the first tool channel, the second tool channel and the third tool channel when the nail head is coaxial with the working piece.

6. The internal fixation device for hallux valgus treatment according to claim 5, wherein the side wall of the fixed rod is provided with a first fixing hole communicated with the third tool channel; the thread rise angle between the threaded rod and the working threaded hole is greater than the friction angle. ​ ​ ​ ​ ​ The side wall of the threaded rod is provided with a first connecting hole, the side wall of the working sleeve is provided with a second connecting hole penetrating the working sleeve, the second connecting hole is communicated with the working threaded hole, the first connecting hole is communicated with the second connecting hole when the threaded rod is threadedly connected with the working threaded hole and reaches a connecting position relative to the working threaded hole, and the first connecting hole is a long hole provided on the side wall of the threaded rod. The hallux valgus treatment internal fixation device further comprises two interlocking screws, one of which is connected with the first fixing hole, and the other interlocking screw is connected with the first connecting hole and the second connecting hole, and the first connecting hole has an extension direction parallel and perpendicular to the axis of the threaded rod, so that the threaded rod can still rotate around its axis in the working threaded hole when the interlocking screw passes through the first connecting hole and the second connecting hole.

7. The hallux valgus treatment internal fixation device according to claim 3 or claim 6, wherein The hallux valgus treatment internal fixation device further comprises two elastic washers, one elastic washer is arranged between the fixed rod and the working sleeve when the working threaded hole is connected with the threaded rod, and the other elastic washer is arranged at the bottom of the working threaded hole.

8. The hallux valgus treatment internal fixation device according to claim 3 or claim 6, wherein The working threaded hole comprises a threaded matching section, a containing section and a terminal section along the depth direction of the working threaded hole, the elastic sleeve coaxial with the containing section is arranged in the containing section, and the elastic sleeve is fixedly arranged in the containing section; The threaded rod comprises a threaded section, a sleeve matching section and a limiting section in sequence from the proximal end of the threaded rod to the distal end of the threaded rod, the threaded section can be threadedly connected with the threaded matching section, the limiting section can reach the terminal section through the threaded matching section and the internal passage of the elastic sleeve, the elastic sleeve is sleeved on the sleeve matching section, and the outer diameter of the limiting section and the outer diameter of the threaded section are both greater than the outer diameter of the sleeve matching section and the inner diameter of the elastic sleeve.

9. The hallux valgus treatment internal fixation device according to claim 8, wherein The elastic sleeve is an absorbable elastic sleeve; The inner wall of the containing section is provided with a release hole communicated with the outside.

10. An internal fixation kit for treating hallux valgus, characterized in that, The hallux valgus treatment internal fixation device comprises the hallux valgus treatment internal fixation device according to claim 6, and further comprises a first aiming frame and a second aiming frame; The first aiming frame comprises a first fixing part capable of being connected with the end of the threaded rod through the first tool channel, the second tool channel and the third tool channel, and further comprises a first aiming arm provided with a first aiming hole matched with the first connecting hole; The second aiming frame comprises a second fixing part capable of being connected with the fixed rod through the first tool channel and the second tool channel, and further comprises a second aiming arm provided with a second aiming hole matched with the first fixing hole.

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