External fixation frame and method for correcting limb alignment

Abstract

The application provides an external fixation support for tubular bone osteotomy, the tubular bone comprising a cutting line and proximal and distal joint ends distributed on both sides of the cutting line, the external fixation support comprising: at least two pairs of fixing needles, each pair of fixing needles comprising one or more fixing needles fixed to the proximal and distal joint ends respectively; a plurality of top blocks fixed to the proximal joint end by the fixing needles, the top blocks comprising first connecting holes and first limiting components, the fixing needles being connected to the top blocks by the first limiting components; a plurality of base blocks fixed to the distal joint end by the fixing needles, the base blocks comprising second connecting holes and second limiting components, the fixing needles being connected to the base blocks by the second limiting components; and connecting members connecting the top blocks and the base blocks by the first connecting holes and the second connecting holes, the connecting members being capable of adjusting the distance between the top blocks and the base blocks. In the external fixation support, the subcutaneous fixing devices do not need to be removed by a secondary operation. Accordingly, the application also provides a method for correcting the force line of a limb.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to an external fixation support and a method for correcting the force line of a limb. BACKGROUND

[0002] Knee osteoarthritis is the most common joint disease in the elderly in China, among which the patellofemoral joint and the medial tibiofemoral joint disease are the most common. The varus and valgus deformities caused by knee osteoarthritis can cause abnormal distribution of joint stress under weight, for example, knee varus deformity causes stress concentration on the medial side of the knee, which accelerates the degenerative changes on the medial side of the knee. When knee valgus deformity occurs, stress concentration occurs on the lateral side of the joint, which accelerates the degenerative changes on the lateral side of the joint. Surgical treatment of osteoarthritis usually uses high tibial osteotomy for treatment.

[0003] High tibial osteotomy (HTO) is used to treat the diseased part of the cylindrical bone, such as knee osteoarthritis, which can be treated by high tibial osteotomy. Knee osteoarthritis is often accompanied by knee varus or valgus deformity. When the knee is varus, stress is concentrated on the medial part of the knee, and the degenerative changes occurring on the medial side of the knee are accelerated. Conversely, when the knee is valgus, these changes occur on the lateral part of the knee. The main purpose of osteotomy is to improve knee function by correcting the knee axis and increasing joint stability. However, high tibial osteotomy has the problem of large surgical trauma and difficult precise control of force line correction. SUMMARY

[0004] The purpose of the present application is to provide an external fixation support and a method for correcting the force line of a limb, which greatly reduces surgical trauma and makes the correction of the force line of the limb more precise.

[0005] In order to achieve the above-mentioned purpose, the present application provides an external fixation support for tubular bone osteotomy, which includes a osteotomy line and its proximal and distal joint ends distributed on both sides, and the external fixation support comprises:

[0006] a top block located at the proximal joint end;

[0007] at least two first limiting components, each of which comprises a first fixing needle and a first limiting piece, the first fixing needle extends into the proximal joint end bone along a first direction after penetrating through the top block, and the first limiting piece extends into the top block along a second direction and abuts against the corresponding first fixing needle;

[0008] a base block located at the distal joint end;

[0009] at least two second limiting assemblies, each of the second limiting assemblies comprising a second fixing needle and a second limiting member, the second fixing needle extending into the distal joint end bone along the first direction, and the second limiting member extending into the base block along the second direction and abutting against the corresponding second fixing needle;

[0010] at least two connecting members arranged between the top block and the base block, the top block and the base block being respectively provided with at least two first connecting holes and second connecting holes along a third direction, and the connecting members penetrating through the first connecting holes and the second connecting holes to connect the top block and the base block, the connecting members being capable of adjusting the distance between the top block and the base block.

[0011] Optionally, one side of the top block and the base block facing the tubular bone is an arc surface.

[0012] Optionally, the top block and the base block are circular arc blocks, the width of the circular arc blocks along the first direction is 10-50 mm, the width of the circular arc blocks along the second direction is 50-200 mm, and the width of the circular arc blocks along the third direction is 20-200 mm.

[0013] Optionally, one side of the base block facing the tubular bone is a plane.

[0014] Optionally, the base block is a rectangular block, the width of the rectangular block along the first direction is 10-50 mm, the width of the rectangular block along the second direction is 50-200 mm, and the width of the rectangular block along the third direction is 20-200 mm.

[0015] Optionally, the distance between adjacent first fixing needles along the second direction is 20-80 mm, and the distance between adjacent second fixing needles along the second direction is 20-80 mm.

[0016] Optionally, the first limiting assembly further comprises:

[0017] a first waist hole penetrating through the top block along the first direction, the width of the first waist hole along the second direction being equal to the diameter of the first fixing needle, and the first fixing needle penetrating through the first waist hole;

[0018] a first limiting hole arranged along the second direction and communicating with the first waist hole, the first limiting member penetrating through the first limiting hole and pressing the first fixing needle.

[0019] Optionally, the second limiting assembly further comprises:

[0020] a second waist hole penetrating through the base block along the first direction, the width of the second waist hole along the second direction being equal to the diameter of the second fixing needle, and the second fixing needle penetrating through the second waist hole.

[0021] A second limiting hole is arranged along the second direction and communicates with the second waist hole, and the second limiting member passes through the second limiting hole to press the second fixing needle.

[0022] Optionally, the first limiting member and the second limiting member are both limiting screws, and the first limiting hole and the second limiting hole are both limiting screw holes matched with the limiting screws.

[0023] Optionally, the diameters of the first fixing needle and the second fixing needle are both 0.5-6 mm, the diameters of the first limiting hole and the second limiting hole are both 3-10 mm, and the lengths of the first waist hole and the second waist hole are both 1-20 mm.

[0024] Optionally, the tip portions of the first fixing needle and the second fixing needle are provided with threads.

[0025] Optionally, the connecting member is a half-threaded bolt, the length of the half-threaded bolt is 50-1000 mm, the diameter of the half-threaded bolt is 3-10 mm, and the length of the light rod close to the top block is 5-10 mm.

[0026] Optionally, the connecting member is a double-threaded screw rod with a diameter of 3-10 mm and a length of 50-1000 mm, and the thread directions of the two ends of the double-threaded screw rod are opposite.

[0027] Optionally, the external fixation support comprises:

[0028] a stop screw;

[0029] The top block and the base block are provided with threaded stop holes along the first direction, and the stop screw extends into the top block along the first direction through the stop hole and abuts against the connecting member.

[0030] Optionally, the threaded portions of the first fixing needle, the second fixing needle and the connecting member are all provided with two opposite thread-removed planes.

[0031] Optionally, a protective sleeve is further sleeved on the middle portion of the connecting member, the side edge of the protective sleeve is open, and the diameter of the protective sleeve is 6-13 mm.

[0032] Optionally, the protective sleeve is made of plastic or silica gel.

[0033] In addition, the application further provides a limb force line correction method using the external fixation support, comprising:

[0034] extending the first fixing needle and the second fixing needle into the proximal joint end and the distal joint end along the first direction;

[0035] The top block is penetrated on the first fixing needle, the first limiting member is extended into the top block along the second direction and abuts against the corresponding first fixing needle, so that the top block is fixed on the proximal joint end, the base block is penetrated on the second fixing needle, the second limiting member is extended into the base block along the second direction and abuts against the corresponding second fixing needle, so that the base block is fixed on the distal joint end;

[0036] The connecting member penetrates the first connecting hole and the second connecting hole along the third direction, so that the top block and the base block are connected;

[0037] The distance between the top block and the base block is adjusted through the connecting member, so that the limb force line is corrected.

[0038] The present application provides an external fixation support for high tibial osteotomy, the tibia includes proximal joint end and distal joint end distributed on both sides of the osteotomy area, the external fixation support includes: at least two pairs of fixing needles, the first fixing needle fixed on the proximal joint end and the second fixing needle fixed on the distal joint end. A plurality of top blocks are fixed on the proximal joint end through the first fixing needle, including at least two first connecting holes and at least two first limiting components, the first fixing needle is fixedly connected with the top block through the first limiting component. A plurality of base blocks are fixed on the distal joint end through the second fixing needle, including at least two second connecting holes and at least two second limiting components, the second fixing needle is fixedly connected with the base block through the second limiting component. At least two connecting members connect the top block and the base block through the first connecting hole and the second connecting hole, and the connecting member can adjust the distance between the top block and the base block. In the external fixation support of the present application, the external fixation support is connected with the proximal joint end and the distal joint end on both sides of the osteotomy area through the fixing needle, without the need for secondary surgery to remove the subcutaneous fixing device relative to the high tibial osteotomy. In addition, the top block and the base block are connected with the fixing needle through the first limiting component and the second limiting component, the connecting member can adjust the distance between the top block and the base block, so that the limb force line can be corrected during or after the operation. Correspondingly, the present application also provides a method for correcting the limb force line. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 It is a schematic view of the position relationship between the external fixation support and the tibia in the first embodiment of the present application;

[0040] Figure 2 It is a structural schematic view of the external fixation support in the first embodiment of the present application;

[0041] Figure 3 It is a structural schematic view of the top block in the first embodiment of the present application;

[0042] Figure 4Structure diagram of the base block in the embodiment one of the present application;

[0043] Figure 5 Front view of the top block in the embodiment one of the present application;

[0044] Figure 6 Side view of the top block in the embodiment one of the present application;

[0045] Figure 7 Structure diagram of the connecting piece in the embodiment one of the present application;

[0046] Figure 8 Structure diagram of the connecting piece in the embodiment two of the present application;

[0047] Figure 9 Structure diagram of the fixing needle in the embodiment three of the present application;

[0048] Figure 10 Structure diagram of the fixing needle and the connecting piece in the embodiment four of the present application;

[0049] Figure 11 Structure diagram of the external fixation support in the embodiment five of the present application;

[0050] Wherein, the reference signs are as follows:

[0051] A - near joint end; B - far joint end;

[0052] 100 - top block; 110 - first limiting assembly; 111 - first waist hole; 112 - first limiting hole; 120 - first

[0053] connecting hole; 130 - first stop hole;

[0054] 200 - base block; 210 - second limiting assembly; 211 - second waist hole; 212 - second limiting hole; 220 - second

[0055] connecting hole; 230 - second stop hole;

[0056] 300 - connecting piece; 310 - protective sleeve; 320 - fitting mouth;

[0057] 400 - fixing needle; 410 - first fixing needle; 420 - second fixing needle;

[0058] 500 - limiting screw;

[0059] 600 - stop screw;

[0060] 700 - threadless plane. DETAILED DESCRIPTION

[0061] The specific embodiments of the present application will be described in more detail below with reference to the accompanying drawings. The advantages and features of the present application will be more clearly understood from the following description. It should be noted that the drawings are very simplified and are not drawn to scale, and are only used to facilitate, clarify and assist in the description of the embodiments of the present application.

[0062] Embodiment one

[0063] High tibial osteotomy is an important technique for treating knee osteoarthritis. The geometry of the knee joint is adjusted by high tibial osteotomy to transfer the load bearing load from the arthritic part of the knee joint bone to the relatively unaffected part of the joint. Knee osteotomy is also used to solve the problem of abnormal lower limb geometry caused by, for example, congenital defects, injuries, etc., such as O-shaped leg orthopedics, etc.

[0064] In this embodiment, the treatment of knee osteoarthritis is taken as an example. Generally, high tibial osteotomy uses a medial open wedge osteotomy. The medial open wedge osteotomy technique makes an incision near the key part of the tibia, separates the parts on both sides of the incision (near the joint end and the far joint end) to open a wedge-shaped opening on the tibia, and then fixes the tibia in this position (for example, inserts a wedge-shaped implant into the wedge-shaped opening on the tibia), thereby redefining the direction of the lower part of the tibia relative to the tibial plateau, and adjusting the way of load transfer from the femur to the tibia.

[0065] Although the medial open wedge osteotomy provides great benefits to patients, the medial open wedge osteotomy has the problem of large surgical trauma. More than 10 cm incision and large area of subcutaneous tissue stripping increase the chances of bleeding, infection and tissue necrosis. Moreover, subcutaneous fixation must be performed to increase postoperative stability, and finally a second operation is required to remove the subcutaneous fixation device, which not only increases the surgical trauma and cost, but also has a high difficulty in precise control of the force line correction, which may affect the clinical efficacy.

[0066] Based on this, the embodiment provides an external fixation support and a method for correcting the force line of a limb, which has smaller surgical trauma and can more accurately correct the force line of the limb.

[0067] Figure 1 Fig. 1 is a schematic diagram of the position relationship between the external fixation support in the embodiment and the tibia, Figure 2 Fig. 2 is a structural schematic diagram of the external fixation support in the embodiment, Figure 3 Fig. 3 is a structural schematic diagram of the top block 100 in the embodiment, Figure 4 Fig. 4 is a structural schematic diagram of the base block 200 in the embodiment.

[0068] As shown in Fig. 1, Figures 1-4As shown, an external fixation support for tubular bone osteotomy, the tubular bone comprising a cutting line and a proximal joint end A and a distal joint end B distributed on both sides of the cutting line, it should be understood that the tubular bone comprises a tibia, the external fixation support comprising:

[0069] a top block 100 located at the proximal joint end A;

[0070] at least two first limiting assemblies 110, each of the first limiting assemblies 110 comprising a first fixing needle 410 and a first limiting piece, the first fixing needle 410 extending into the proximal joint end A along a first direction after penetrating through the top block 100, and the first limiting piece extending into the top block 100 along a second direction and abutting against the corresponding first fixing needle 410;

[0071] a base block 200 located at the distal joint end B;

[0072] at least two second limiting assemblies 210, each of the second limiting assemblies 210 comprising a second fixing needle 420 and a second limiting piece, the second fixing needle 420 extending into the distal joint end B along the first direction after penetrating through the base block 200, and the second limiting piece extending into the base block 200 along the second direction and abutting against the corresponding second fixing needle 420;

[0073] at least two connecting pieces 300 located between the top block 100 and the base block 200, the top block 100 and the base block 200 being respectively provided with at least two first connecting holes 120 and second connecting holes 220 along a third direction, the connecting pieces 300 penetrating through the first connecting holes 120 and the second connecting holes 220 to connect the top block 100 and the base block 200, and the connecting pieces 300 being capable of adjusting the distance between the top block 100 and the base block 200.

[0074] Please continue to refer to Figure 1, specifically, the first fixing needle 410 fixed at the proximal joint end A and the second fixing needle 420 fixed at the distal joint end B can be the same type of fixing needle 400. The top block 100 is fixed to the proximal joint end A by the fixing needle 400, and the top block 100 comprises at least two first connecting holes 120 and at least two first limiting assemblies 110, and the fixing needle 400 is fixedly connected with the top block 100 through the first limiting assembly 110. The base block 200 is fixed to the distal joint end B by the fixing needle 400, and the base block 200 comprises at least two second connecting holes 220 and at least two second limiting assemblies 210, and the fixing needle 400 is fixedly connected with the base block 200 through the second limiting assembly 210. A set of external fixation supports at least two connecting pieces 300, which connect the top block 100 and the base block 200 through the first connecting hole 120 and the second connecting hole 220, and the connecting piece 300 can adjust the distance between the top block 100 and the base block 200.

[0075] Generally, the number of fixing needles 400 is two pairs, that is, a pair of first fixing needles 410 and a pair of second fixing needles 420. It should be understood that the number of fixing needles 400 can also be three pairs, four pairs or five pairs, which is not limited here.

[0076] The diameter of the fixing needle 400 is 0.5-6mm, that is, the diameter of the first fixing needle and the second fixing needle is 0.5-6mm. Respectively fixed at the proximal joint end A and the distal joint end B. The fixing needle 400 fixed at the proximal joint end A is the first fixing needle 410, and the fixing needle fixed at the distal joint end B is the second fixing needle 420.

[0077] Generally, the first fixing needle 410 and the second fixing needle 420 are the same type of fixing needle. It should be known that the first fixing needle 410 and the second fixing needle 420 can also use different types of fixing needles 400 when necessary, such as different lengths and different diameters.

[0078] It should be understood that in a set of external fixation supports, several top blocks 100 can be stacked together for use, and several base blocks 200 can also be stacked together for use.

[0079] Generally, the number of top blocks 100 and base blocks 200 is one, but according to actual conditions, multiple can be used when necessary. The number of connecting pieces 300 is generally two, which can be appropriately increased according to actual needs when necessary, for example, the number of connecting pieces 300 is increased to three.

[0080] Please refer to Figure 3The top block 100 is fixed to the proximal joint end A by the fixing needle 400, and comprises at least two first connecting holes 120 and at least two first limiting components 110. As an example, two first connecting holes 120 and two first limiting components 110 are arranged on the top block 100 in the embodiment. The spacing between the first limiting components 110 is 20-80 mm, and the spacing between adjacent first fixing needles in the second direction is also 20-80 mm.

[0081] Figure 5 A front view of the top block 100 in the embodiment of the application, Figure 6 A side view of the top block 100 in the embodiment of the application. As shown in Figure 5 and Figure 6 The first limiting component further comprises:

[0082] A first waist hole 111 is arranged through the top block 100 in the first direction, and the width of the first waist hole 111 in the second direction is consistent with the diameter of the first fixing needle 410. A first limiting hole 112 is arranged in the second direction and communicates with the first waist hole 111. The first fixing needle 410 passes through the first waist hole 111, and the first limiting member presses the first fixing needle 410 through (or passes through) the first limiting hole 112.

[0083] In detail, the first limiting member is a limiting screw 500, and the first limiting hole 112 is a threaded limiting hole arranged on the side surface of the top block 100 in the second direction. The limiting screw 500 matches the first limiting hole 112. Optionally, the diameter of the first limiting hole 112 is 3-10 mm.

[0084] The top block 100 is further provided with a first waist hole 111 that penetrates the top block 100 in the axial direction of the first fixing needle 410, i.e., the first direction. The width of the first waist hole 111 in the first direction is the length of the first waist hole 111, and the width of the first waist hole 111 in the second direction is the width of the first waist hole 111. The length of the first waist hole 111 is 1-20 mm. The width of the first waist hole 111 is consistent with the diameter of the first fixing needle 410. The first fixing needle 410 passes through the first waist hole 111, and the first limiting member presses the first fixing needle through the first limiting hole 112, i.e., the limiting screw 500 presses the first fixing needle 410 through the first limiting hole 112. In this way, the top block 100 can maintain a relative position with the first fixing needle 410, i.e., the top block 100 is fixed to the proximal joint end A by the fixing needle 400.

[0085] Optionally, the top block 100 has an arc surface facing the tubular bone (tibia). The reason for this is that the proximal end A of the tibia has an arc surface, and the top block 100 is designed to match the arc surface of the proximal end A of the tibia.

[0086] Optionally, the top block 100 is a circular arc block, the first fixing needle 410 is the thickness of the circular arc block in the axial direction, the thickness of the circular arc block is 10-50mm, the height is 20-200mm, and the outer arc surface width is 50-200mm. That is, the width of the circular arc block along the first direction is 10-50mm, the width along the second direction is 50-200mm, and the width along the third direction is 20-200mm.

[0087] Please refer to Figure 4 The base block 200 is fixed to the distal end B by the second fixing needle 420, and the base block 200 includes at least two second connecting holes 220 and at least two second limiting components 210. As an example, the base block 200 in this embodiment is provided with two second connecting holes 220 and two second limiting components 210. The distance between the second limiting components 210 is 20-80mm, and similarly, the distance between adjacent second fixing needles 420 in the second direction is 20-80mm.

[0088] The second limiting component 210 further includes:

[0089] The second waist hole is arranged through the base block 200 in the first direction, and the width of the second waist hole 211 in the second direction is consistent with the diameter of the second fixing needle;

[0090] The second limiting hole 212 is arranged in the second direction and is in communication with the second waist hole 211, the second fixing needle 420 passes through the second waist hole 211, and the second limiting member presses the second fixing needle 420 through (or passes through) the second limiting hole 212.

[0091] In detail, the first limiting member is a limiting screw 500, and the second limiting hole 212 is a threaded second limiting hole 212 arranged on the side surface of the base block 200 in the second direction. The limiting screw 500 is matched with the second limiting hole 212, and the diameter of the second limiting hole 212 is 3-10mm.

[0092] The base block 200 is also provided with a second waist hole 211 penetrating the base block 200 along the axial direction of the second fixing needle 420, i.e. the first direction. The width of the second waist hole 211 along the first direction is the length of the second waist hole 211, and the width of the second waist hole 211 along the second direction is the width of the second waist hole 211. The length of the second waist hole 211 is 1-20 mm, and the width of the second waist hole 211 is consistent with the diameter of the second fixing needle 420. The second fixing needle 420 penetrates the second waist hole 211, and the second limiting member presses the second fixing needle through the second limiting hole 212, i.e. the limiting screw 500 presses the second fixing needle 420 through the second limiting hole 212. In this way, the base block 200 can keep the relative position unchanged with the second fixing needle 420, i.e. the base block 200 is fixed to the distal end B of the joint through the fixing needle 400.

[0093] Preferably, the surface of the base block 200 facing the tubular bone (tibia) is a plane. The reason for this arrangement is that the profile surface of the distal end B of the tibia is approximately a plane, so as to enable the base block 200 to fit the profile surface of the distal end B of the tibia, and therefore the surface of the base block 200 facing the tibia is arranged as a plane.

[0094] Preferably, the base block 200 is a rectangular block, the axial direction of the second fixing needle 420 is the width of the base block 200, the length of the base block 200 is 50-200 mm, the width is 10-50 mm, and the height is 20-200 mm, i.e. the width of the rectangular block along the first direction is 10-50 mm, the width along the second direction is 50-200 mm, and the width along the third direction is 20-200 mm. It should be understood that the volume of the base block 200 can be smaller than the volume of the top block 100, so as to reduce the overall weight of the external fixation support.

[0095] Preferably, the materials of the top block 100, the base block 200 and the connecting member 300 are all stainless steel, and more preferably, the top block 100, the base block 200 and the connecting member 300 are made of 316 stainless steel.

[0096] Figure 7 The structure of the connecting member 300 in the embodiment of the application is shown in the schematic view.

[0097] As Figure 7As shown, the connecting member 300 is a half-threaded bolt with a diameter of 3-10 mm, a length of 50-1000 mm, and a length of 5-10 mm of the smooth part at the end close to the top block 100. That is, the connecting member 300 is a half-threaded bolt with a length of 50-1000 mm, and the length of the smooth part of the half-threaded bolt is 5-10 mm.

[0098] The head of the half-threaded bolt corresponds to the top block 100, and the tail corresponds to the base block 200. The first connecting hole 120 and the second connecting hole 220 are threaded holes.

[0099] Specifically, in the osteotomy surgery, when the half-threaded bolt needs to distract the cylindrical bone, the threaded part of the half-threaded bolt penetrates into the first connecting hole 120, so that the half-threaded bolt is integrated with the top block 100, and the tail of the half-threaded bolt does not enter the second connecting hole 220, and the tail of the half-threaded bolt abuts against the base block 200. At this time, rotating the half-threaded bolt can expand the distance between the top block 100 and the base block 200, so as to achieve the distraction of the osteotomy line of the cylindrical bone, and open a wedge-shaped opening on the cylindrical bone for implanting a wedge-shaped implant.

[0100] After the wedge-shaped implant is inserted into the wedge-shaped opening on the cylindrical bone, it is necessary to tighten the proximal joint end A and the distal joint end B. That is, it is necessary to reduce the distance between the top block 100 and the base block 200 through the half-threaded bolt. At this time, the half-threaded bolt is first rotated so that the threaded part of the half-threaded bolt penetrates through the top block 100, and the smooth part of the half-threaded bolt can slide in the first connecting hole 120 of the top block 100. Then, the tail of the half-threaded bolt is aligned with the second connecting hole 220 on the base block 200. After the threaded part of the half-threaded bolt penetrates through the top block 100, rotating the half-threaded bolt can make the head of the half-threaded bolt pull the top block 100 to approach the base block 200. The reduction of the distance between the top block 100 and the base block 200 can achieve the tightening of the proximal joint end A and the distal joint end B, and further achieve the operation of fixing the cylindrical bone.

[0101] Optionally, the external fixation support further comprises a stop screw 600, and the top block 100 and the base block 200 are provided with threaded stop holes in the first direction, and the stop screw 600 extends to the top block 100 and the base block in the first direction through the stop holes to press the connecting member 300. Specifically, the threaded stop hole provided on the top block 100 is a first stop hole 130. The threaded stop hole provided on the base block 200 is a second stop hole 230.

[0102] The connecting piece 300 is used to avoid the change of the distance between the top block 100 and the base block 200 after the distance is adjusted, so as to avoid the self-rotation of the connecting piece 300 (half tooth bolt) and the change of the distance between the top block 100 and the base block 200. The connecting piece 300 is pressed by the stop screw 600 and the stop hole, so as to prevent the self-rotation of the connecting piece 300 (half tooth bolt) and the change of the distance between the top block 100 and the base block 200.

[0103] Optionally, the middle part of the connecting piece 300 is sleeved with a protective sleeve 310 made of plastic or silica gel. It should be known that the half tooth bolt is used as the connecting piece 300, and the skin is easily pressed by the half tooth bolt, which causes the patient to feel uncomfortable or even causes the skin to be broken. This is not expected, and the protective sleeve 310 is arranged in the middle part of the connecting piece 300 to avoid the pressure injury of the skin caused by the half tooth bolt. Effectively, the protective sleeve 310 is made of plastic or silica gel. The protective sleeve 310 made of skin-friendly materials can improve the comfort of the patient.

[0104] Since the patient's body type is different every time the high tibial osteotomy is performed, the position of the wedge-shaped opening is different, and the distance between the top block 100 and the base block 200 is also different. Based on this, the side opening of the protective sleeve 310 is 6-13 mm in diameter. In an embodiment of the present application, the protective sleeve 300 is a plastic tube, and the length of the plastic tube is cut according to the distance between the base block 200 and the top block 100. It should be known that the side opening of the protective sleeve 310 is used to facilitate the sleeve of the protective sleeve 300 on the outer periphery of the connecting piece 300.

[0105] In addition, the present application also provides a limb force line correction method using the external fixation support. The limb force line correction method using the external fixation support comprises the following steps.

[0106] The first fixing needle 410 and the second fixing needle 420 are extended into the proximal joint end A and the distal joint end B of the cylindrical bone along the first direction;

[0107] The top block 100 is sleeved on the first fixing needle 410, the first limiting piece is extended into the top block 100 along the second direction and abuts against the corresponding first fixing needle 410, so that the top block 100 is fixed on the first fixing needle 410 and the proximal joint end A. The base block 200 is sleeved on the second fixing needle 420, the second limiting piece is extended into the base block 200 along the second direction and abuts against the corresponding second fixing needle 420, so that the base block 200 is fixed on the second fixing needle 420 and the distal joint end B;

[0108] The connecting piece 300 is inserted through the first connecting hole 120 and the second connecting hole 220 along a third direction to connect the top block 100 and the base block 200;

[0109] The distance between the top block 100 and the base block 200 is adjusted by the connecting piece 300 to correct the limb force line.

[0110] Embodiment Two

[0111] The external fixation support and the limb force line correction method provided by the embodiment are the same as those of Embodiment One, and the different points are described below.

[0112] Figure 8 The structure of the connecting piece 300 in the embodiment is shown in the figure.

[0113] As shown in the figure, Figure 8 the difference between the embodiment and Embodiment One is that the connecting piece 300 is a double-end screw with a diameter of 3-10 mm and a length of 50-1000 mm, and the thread directions of the two ends of the double-end screw are opposite.

[0114] Specifically, the double-end screw is provided with threads at both ends, and the middle part of the double-end screw is not provided with threads, that is, the middle part of the double-end screw is a smooth rod. The thread directions of the two ends of the double-end screw are opposite, and the first connecting hole 120 and the second connecting hole 220 are arranged in the matching threads of the double-end screw. In this way, when the double-end screw is rotated clockwise or counterclockwise, the distance between the top block 100 and the base block 200 will be increased or decreased accordingly.

[0115] It should be understood that, compared with the half-dental bolt in Embodiment One, the distance between the top block 100 and the base block 200 is adjusted to tighten the proximal joint end A and the distal joint end B, and the tail of the half-dental bolt needs to be repositioned with the second connecting hole 220 during the implementation process, which may cause the proximal joint end A and the distal joint end B to exist lateral movement, which is not conducive to the fixation of the wedge-shaped implant.

[0116] In the embodiment, the connecting piece 300 is always connected with the top block 100 and the base block 200, and the relative position between the top block 100 and the base block 200 is kept unchanged in the third direction during the process of distracting the cylindrical bone osteotomy line and tightening the proximal joint end A and the distal joint end B, so that the lateral movement of the proximal joint end A and the distal joint end B can be weakened, which is conducive to the fixation of the wedge-shaped implant.

[0117] Preferably, the middle portion of the double-ended screw is further provided with a mating opening 320 (shaped like a nut) for engaging with an open-end wrench. The mating opening 320 facilitates adjustment of the distance between the top block 100 and the base block 200.

[0118] Example 3

[0119] The external fixation bracket and limb alignment correction method provided in this embodiment are the same as those in Embodiment 1 and Embodiment 2, and will not be described here. Only the differences will be described below.

[0120] The fixation pin 400 needs to be drilled into the tubular bone (tibia) to a certain length. Preferably, the fixation pin 400 passes through the joint membrane of the tibia. Typically, the implantation of the fixation pin 400 involves the surgeon manually drilling a deep hole in the tubular bone, then tapping the fixation pin 400 to enter the deep hole, so that the fixation pin 400 fits the tibia with an interference fit.

[0121] Figure 9 This is a schematic diagram of the structure of the fixing pin 400 in an embodiment of the present invention, as shown below. Figure 9 As shown, the difference between this embodiment and Embodiments 1 and 2 is that the fixing pin 400 is threaded. Preferably, the threaded fixing pin 400 has threads distributed throughout its outer circumference. More preferably, the portion of the fixing pin 400 that enters the tibia is threaded. In one embodiment of this invention, the portions of the first fixing pin 410 and the second fixing pin 420 that extend into the tubular bone are pointed, and the pointed portions of the first fixing pin 410 and the second fixing pin 420 are threaded. Thus, when the fixing pin 400 is fixed to the tubular bone, rotating the fixing pin 400 causes the threads on the fixing pin 400 to drive it into the tubular bone. Compared to a non-threaded fixing pin 400, using a threaded fixing pin 400 eliminates the need to strike the fixing pin 400 to allow it to enter the tubular bone, reducing the operator's workload and preventing secondary damage to the tubular bone from striking the fixing pin 400.

[0122] Example 4

[0123] The external fixation bracket and limb alignment correction method provided in this embodiment are the same as those in Embodiments 1, 2 and 3, and will not be described here. Only the differences will be described below.

[0124] Figure 10 This is a schematic diagram of the structure of the fixing pin 400 and the connector 300 in an embodiment of the present invention. Figure 10As shown, the difference between the embodiment and the embodiments one, two and three lies in that the threaded portions of the first fixing needle 410, the second fixing needle 420 and the connecting piece 300 are configured with two opposite thread-removing planes 700.

[0125] Specifically, one opposite surface of the fixing needle 400 and the threaded portion of the connecting piece 300 is cut into two planes. When the stop screw 600 is pressed against the stop hole on the top block 100 and the base block 200 to press the connecting piece 300, the tail of the stop screw 600 is directly pressed against the thread-removing plane 700. The rotation of the fixing needle 400 or the connecting piece 300 can be better prevented.

[0126] Embodiment five

[0127] The same parts of the external fixation support and the limb force line correction method provided by the embodiment and the embodiments one, two, three and four are not described herein again, and only the different points are described below.

[0128] The difference between the embodiment and the embodiments one, two, three and four lies in that one side of the base block 200 facing the tubular bone is an arc surface, the base block 200 is a circular arc block, the axial direction of the first fixing needle 410 is the thickness of the circular arc block, the thickness of the circular arc block is 10-50mm, the height is 20-200mm, and the outer arc surface width is 50-200mm. That is, the width of the circular arc block along the first direction is 10-50mm, the width along the second direction is 50-200mm, and the width along the third direction is 20-200mm. Furthermore, the structure and shape of the base block 200 and the top block 100 are consistent.

[0129] Figure 11 The structure of the external fixation support in the embodiment of the application is shown in the figure. Figure 11 As shown, the structure and shape of the base block 200 and the top block 100 are consistent, and both are circular arc blocks. In this way, the parts of the external fixation support have stronger universality.

[0130] In summary, the embodiment of the application provides an external fixation support for tubular bone osteotomy, the tubular bone includes a bone cutting line and proximal and distal joint ends distributed on both sides of the bone cutting line, and the external fixation support includes a top block, a base block, a first limiting assembly, a first limiting assembly and a connecting piece.

[0131] The top block is located at the proximal joint end, at least two first limiting components, each of which comprises a first fixed needle and a first limiting piece, the first fixed needle extends into the proximal joint end along a first direction after penetrating the top block, and the first limiting piece extends into the top block along a second direction and abuts against the corresponding first fixed needle. The base block is located at the distal joint end, at least two second limiting components, each of which comprises a second fixed needle and a second limiting piece, the second fixed needle extends into the distal joint end along the first direction after penetrating the base block, and the second limiting piece extends into the base block along the second direction and abuts against the corresponding second fixed needle. At least two connecting pieces are located between the top block and the base block, the top block and the base block are respectively provided with at least two first connecting holes and second connecting holes along a third direction, the connecting pieces penetrate the first connecting holes and the second connecting holes to connect the top block and the base block, and the connecting pieces can adjust the distance between the top block and the base block. In the external fixation support of the application, the fixed needle connects the external fixation support with the proximal joint end and the distal joint end on both sides of the osteotomy area, and relative to the transmitted tibial high osteotomy, there is no need for secondary surgery to remove the subcutaneous fixing device. In addition, the top block and the base block are connected with the fixed needle through the first limiting component and the second limiting component, the connecting piece can adjust the distance between the top block and the base block, so as to facilitate the correction of the limb alignment in the operation or after the operation. Correspondingly, the application also provides a method for correcting the limb alignment.

[0132] The above is only the preferred embodiment of the present application, and does not limit the present application in any way. Any person skilled in the art can make any form of equivalent replacement, modification or change to the technical solutions and technical contents disclosed in the present application without departing from the scope of the technical solutions of the present application, which still belongs to the protection scope of the present application.

Claims

1. An external fixation frame for use in a tubular bone osteotomy, said tubular bone osteotomy comprising an osteotomy line and proximal and distal articular ends distributed on both sides of the osteotomy line, characterized in that, The external fixation support comprises: a top block located at the proximal end of the joint; at least two first limiting assemblies, each of which comprises a first fixing needle and a first limiting piece, the first fixing needle extends into the bone at the proximal end of the joint along a first direction, the top block is provided with a first waist hole along the first direction, the width of the first waist hole along a second direction is equal to the diameter of the first fixing needle, the first waist hole is in communication with a first limiting hole provided along the second direction, and the first limiting piece passes through the first limiting hole along the second direction and radially abuts against the first fixing needle; a base block located at the distal end of the joint; at least two second limiting assemblies, each of which comprises a second fixing needle and a second limiting piece, the second fixing needle extends into the bone at the distal end of the joint along the first direction, the base block is provided with a second waist hole along the first direction, the width of the second waist hole along the second direction is equal to the diameter of the second fixing needle, the second waist hole is in communication with a second limiting hole provided along the second direction, and the second limiting piece passes through the second limiting hole along the second direction and radially abuts against the second fixing needle; at least two connecting pieces located between the top block and the base block, the top block and the base block are respectively provided with at least two first connecting holes and second connecting holes along a third direction, the connecting pieces pass through the first connecting holes and the second connecting holes to connect the top block and the base block, and the connecting pieces can adjust the distance between the top block and the base block.

2. The external fixation bracket of claim 1, wherein, The top block and the base block are arc surfaces facing the tubular bone.

3. The external fixation tower of claim 2, wherein The top block and the base block are circular arc blocks, the width of the circular arc block along the first direction is 10-50 mm, the width of the circular arc block along the second direction is 50-200 mm, and the width of the circular arc block along the third direction is 20-200 mm.

4. The external fixation stabilizer of claim 1, wherein The base block is a rectangular block, the width of the rectangular block along the first direction is 10-50 mm, the width of the rectangular block along the second direction is 50-200 mm, and the width of the rectangular block along the third direction is 20-200 mm.

5. The external fixation tower of claim 4, wherein The first fixing needle and the second fixing needle are threaded at the tip portions thereof.

6. The external fixation stabilizer of claim 1, wherein The connecting piece is a half-threaded bolt, the length of the half-threaded bolt is 50-1000 mm, the diameter of the half-threaded bolt is 3-10 mm, and the end of the connecting piece close to the top block is a length of 5-10 mm light rod.

7. The external fixation tower of claim 1, wherein ​ 8. The external fixation tower of claim 7, wherein, ​ 9. The external fixation tower of claim 7, wherein ​ 10. The external fixation tower of claim 7, wherein The connecting piece is a double-end screw with a diameter of 3-10 mm and a length of 50-1000 mm, and the two ends of the double-end screw are opposite in screw direction.

11. The external fixation tower of claim 9 or 10, wherein, The application relates to a connecting piece for connecting a top block and a base block. A stop screw; The top block and the base block are provided with threaded stop holes in the first direction, and the stop screw extends into the top block and the base block along the first direction through the stop holes and abuts against the connecting piece.

12. The external fixation tower of claim 11, wherein, The first fixing needle, the second fixing needle and the threaded part of the connecting piece are all provided with two opposite thread-removing planes.

13. The external fixation stabilizer of claim 1, wherein The middle part of the connecting piece is further sleeved with a protective sleeve, the side edge of the protective sleeve is open, and the diameter of the protective sleeve is 6-13 mm.

14. The external fixation tower of claim 13, wherein, The protective sleeve is made of plastic or silica gel.

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