Joint bone nail

Abstract

The utility model provides a joint bone nail, and relates to the technical field of medical equipment. The joint bone nail comprises a nail rod, threads are arranged on the outer surface of the nail rod, and the thread pitch of the threads is gradually increased or gradually decreased along the central axis of the nail rod; wherein the nail rod is provided with a near end and a far end, the near end is far away from the first bone tissue, the far end is close to the first bone tissue, and the nail rod is provided with a first end face obliquely intersecting with the central axis of the nail rod and close to the near end. According to the joint bone nail provided by the invention, the joint stability can be improved, and the possibility of generating irritation reaction can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, and in particular to a joining bone nail. BACKGROUND

[0002] In the surgical treatment of hallux valgus, generally includes osteotomy, reduction and fixation steps, in particular, the surgeon by surgical operation to cut off the hallux and the first metatarsal bone valgus part and the hallux and the first metatarsal bone valgus reduction, and finally fixed part of the bone tissue after reduction, to prevent the two parts of the bone tissue from shifting. Because the hallux and the first metatarsal bone after osteotomy reduction will be misaligned by a certain distance, usually after drilling oblique bone tunnel, implanting bone nail to fix the two parts of the bone tissue.

[0003] However, because the pitch of the thread of the bone nail is usually equal, after implanting the bone nail, the two parts of the bone tissue are not stable, thereby affecting the healing of the bone tissue; and the end surface of the bone nail is usually perpendicular to the central axis, after implanting the bone nail into the oblique bone tunnel, the end of the bone nail may still be exposed to the bone surface, thereby having the risk of causing irritation reaction. CONTENT OF THE UTILITY MODEL

[0004] Therefore, the purpose of the present application is to overcome the deficiencies in the prior art, and provide a joining bone nail which can improve the stability of the joint and reduce the possibility of irritation reaction.

[0005] The present application provides the following technical solutions:

[0006] The present application provides a joining bone nail, which is used for joining a first bone tissue and a second bone tissue, and includes:

[0007] A nail rod, which has a thread on the outer surface thereof, and the pitch of the thread gradually increases or gradually decreases along the central axis of the nail rod;

[0008] Wherein, the nail rod has a proximal end and a distal end, the proximal end is away from the first bone tissue, the distal end is close to the first bone tissue, and the nail rod has a first end surface which is oblique to the central axis of the nail rod and close to the proximal end.

[0009] In some embodiments, the pitch of the thread close to the distal end is greater than the pitch of the thread close to the proximal end.

[0010] In some embodiments, the shape of the first end surface is the same as that of the implant surface of the first bone tissue.

[0011] In some embodiments, the included angle between the central axis of the nail rod and the first end surface is A, and satisfies: 20°≤A≤70°.

[0012] In some embodiments, the junction bone peg is made of inorganic material and absorbable material.

[0013] In some embodiments, the stem includes a tip portion at the end of the distal end.

[0014] In some embodiments, the stem includes a main body portion, and the stem is tapered or the main body portion is constant in diameter.

[0015] In some embodiments, the stem further includes a smooth surface disposed on a portion of the stem between the proximal end and the distal end.

[0016] In some embodiments, the stem has a first channel with a tapered portion.

[0017] In some embodiments, the first channel has a hexagonal cross-section.

[0018] Embodiments of the present application have the following advantages:

[0019] The present application provides a junction bone peg, by providing a thread with a gradually changing pitch on the outer surface of the stem of the junction bone peg, when the junction bone peg is engaged with the first bone tissue and the second bone tissue, the first bone tissue and the second bone tissue can be brought closer to each other, so that the first bone tissue and the second bone tissue are tightly fitted, and the stability of the engagement is improved; in addition, by making the first end surface of the stem close to the proximal end obliquely intersect with the central axis of the stem, after the junction bone peg is implanted in the oblique bone tunnel, the first end surface matches the implantation surface of the first bone tissue, which can help to reduce the volume of the part of the stem exposed to the first bone tissue, reduce the stimulation to other tissues, and thus reduce the possibility of producing an irritation reaction.

[0020] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0022] Figure 1 is a diagram showing the application scene of the junction bone peg involved in the example of the present application;

[0023] Figure 2 is a structural schematic view showing a first embodiment of a junction bone peg according to the present application;

[0024] Figure 3 is a structural schematic view showing a second embodiment of a junction bone peg according to the present application;

[0025] Figure 4 is a schematic view showing the first embodiment of a junction bone peg according to the present application in a first bone tissue and a second bone tissue;

[0026] Figure 5 is a view showing the first embodiment of a junction bone peg according to the present application along an implantation direction;

[0027] Figure 6 is a view showing Figure 5 is a sectional view of the junction bone peg shown along a line X-X;

[0028] Figure 7 is a structural schematic view showing a second channel according to the present application.

[0029] Main element symbol explanation:

[0030] 1 - bone tissue; 11 - first bone tissue; 111 - first bone surface; 112 - third bone surface; 1121 - implantation surface; 12 - second bone tissue; 121 - second bone surface;

[0031] 2 - bone tunnel;

[0032] 3 - junction bone peg; 31 - peg shaft; 311 - main body portion; 312 - proximal end; 313 - distal end; 314 - first end surface; 315 - second end surface; 316 - smooth surface; 317 - tip portion; 318 - first channel; 3181 - tapered portion; 319 - second channel; 32 - screw thread; 321 - first screw thread; 322 - second screw thread;

[0033] D - implantation direction. DETAILED DESCRIPTION

[0034] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals are used throughout to designate the same or similar elements or elements having the same or similar functions. The embodiments described below by reference to the drawings are exemplary only, and are used only for the purpose of explanation of the present application, and are not to be understood as limiting the present application.

[0035] It is to be noted that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. Like terms are used to describe like elements in the figures and the description.

[0036] In this application, unless otherwise clear and limited by the context, the terms "mount", "connect", "connection", "fixed", and the like should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0037] In addition, the terms "first", "second", "third" and the like are used only to describe the purpose and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the specification of the template is only for the purpose of describing the specific embodiments and is not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more of the associated listed items.

[0039] In the related art, in the surgical treatment for treating hallux valgus, generally includes the steps of osteotomy, reduction and fixation, specifically, the surgeon cuts off the part of the hallux and the first metatarsal bone by surgical operation and reduces the hallux and the first metatarsal bone, and finally fixes the part of the bone tissue after reduction, to prevent the displacement of the two parts of the bone tissue. Since the bone surface of the hallux and the first metatarsal bone after osteotomy and reduction will be misaligned by a certain distance and cannot be aligned, a bone tunnel is usually drilled obliquely, and then a bone screw is implanted to fix the two parts of the bone tissue.

[0040] However, since the thread pitch of bone screws is usually equal, the two parts of bone tissue may not be firmly joined after the screw is implanted, which may affect the healing of the bone tissue. In addition, the end face of the bone screw is usually perpendicular to its central axis. After the bone screw is implanted into the oblique bone tunnel, part of the end of the bone screw may still be exposed on the bone surface, which may pose a risk of triggering an irritation reaction.

[0041] This utility model relates to a connecting bone nail 3, which is used to sequentially implant a first bone tissue 11 and a second bone tissue 12 to connect the first bone tissue 11 and the second bone tissue 12.

[0042] The bone screw 3 involved in this utility model has a thread 32 with a gradually changing pitch on the outer surface of the screw rod 31. When the bone screw 3 is engaged with the first bone tissue 11 and the second bone tissue 12, it can bring the first bone tissue 11 and the second bone tissue 12 closer to each other, thereby making the first bone tissue 11 and the second bone tissue 12 fit tightly together and improving the stability of the engagement. In addition, by making the first end face 314 near the proximal end 312 of the screw rod 31 obliquely intersecting the central axis of the screw rod 31, after the bone screw 3 is implanted into the oblique bone tunnel 2, the first end face 314 matches the implantation surface 1121 of the first bone tissue 11. This can help reduce the volume of the part of the screw rod 31 exposed in the first bone tissue 11, reduce stimulation to other tissues, and thus reduce the possibility of irritation.

[0043] In some embodiments, the connecting bone screw 3 involved in this utility model may also be referred to as a connecting screw, bone screw, compression screw, absorbable bone screw, or compressible bone screw, etc.

[0044] In some embodiments, bone tissue 1 may include the big toe bone and the first metatarsal bone. In some embodiments, other tissues may refer to tissues other than bone tissue 1, such as muscle tissue and nerve tissue, or may refer to intact bone tissue 1 other than the bone tissue 1 to be joined. In some embodiments, joining may refer to the process of inserting the bone screw 3 into the bone tissue 1.

[0045] The following is a detailed description of the connecting bone nail 3 involved in this utility model, with reference to the accompanying drawings.

[0046] Figure 1 This diagram illustrates an application scenario of the connecting bone nail 3 involved in this utility model. Figure 1 In this illustration, the structure of the connecting bone nail 3 has been simplified for clarity, but this should not be construed as a limitation of the present invention.

[0047] In some embodiments, see Figure 1A bone tunnel 2 can be drilled in the bone tissue 1. In some embodiments, the engaging bone peg 3 can be implanted in the bone tissue 1 through the bone tunnel 2. Thereby, the implantation of the engaging bone peg 3 can be facilitated and the damage to the bone tissue 1 can be reduced.

[0048] In some embodiments, referring to Figure 1 , the bone tissue 1 can include a first bone tissue 11. In some embodiments, the bone tissue 1 can include a second bone tissue 12. In some embodiments, the engaging bone peg 3 can be implanted in the first bone tissue 11 and the second bone tissue 12.

[0049] In some embodiments, the engaging bone peg 3 can be used to engage the first bone tissue 11 and the second bone tissue 12. In some embodiments, the engaging bone peg 3 can be a bone peg used to be implanted in the first bone tissue 11 and the second bone tissue 12 in sequence so as to engage the first bone tissue 11 and the second bone tissue 12.

[0050] In some embodiments, referring to Figure 1 , the first bone tissue 11 can include a first bone surface 111. In some embodiments, the second bone tissue 12 can include a second bone surface 121. In some embodiments, the first bone surface 111 and the second bone surface 121 can be misaligned with each other. For example, the center of the first bone surface 111 can not be aligned with the center of the second bone surface 121. In some embodiments, the first bone tissue 11 can further include a third bone surface 112.

[0051] In some embodiments, referring to Figure 1 , the engaging bone peg 3 can be implanted in the bone tissue 1 obliquely. In some embodiments, the engaging bone peg 3 can be implanted in the first bone tissue 11 and the second bone tissue 12 in sequence from the third bone surface 112. In other words, the axis of the bone tunnel 2 can be oblique to the third bone surface 112.

[0052] In some embodiments, referring to Figure 1 , the implantation direction D of the engaging bone peg 3 can be parallel to the axis of the bone tunnel 2. In this case, by implanting the engaging bone peg 3 in the bone tissue 1 along the bone tunnel 2, the implantation of the engaging bone peg 3 can be facilitated.

[0053] In some embodiments, the engaging bone peg 3 can be made of a composite material. In some embodiments, the engaging bone peg 3 can be made of an inorganic material. For example, inorganic particles. In some embodiments, the inorganic material can be at least one of hydroxyapatite, calcium polyphosphate, and tricalcium phosphate. In this case, by using the inorganic material, acidic substances generated in the healing process can be absorbed, thereby reducing the possibility of inflammation.

[0054] In some embodiments, the joining bone pin 3 can be made of absorbable material. For example, a polymer material. In some embodiments, the absorbable material can be at least one of polylactic acid material, polycaprolactone, poly-p-dioxanone, and polyglycolic acid. In addition, in some embodiments, the absorbable material can be one of a binary or more random copolymer or block copolymer. For example, lactide, caprolactone, p-dioxanone, and glycolide. In this case, by using the absorbable material, the possibility of rejection reaction can be reduced, and the joining bone pin 3 can be absorbed by the first bone tissue 11 and the second bone tissue 12 during the healing process, thereby promoting the healing of the first bone tissue 11 and the second bone tissue 12. In addition, since the joining bone pin 3 can be absorbed by the bone tissue 1, it can help to avoid secondary surgery.

[0055] In some embodiments, the joining bone pin 3 can be made by an injection molding process and a polymer forging process. In other words, the processing process of the joining bone pin 3 can include an injection molding process and a polymer forging process.

[0056] In some embodiments, when the joining bone pin 3 is prepared, the injection molding process can be performed first, and then the polymer forging process can be performed. In this case, by processing the joining bone pin 3 by the injection molding process, the efficiency of the processing of the joining bone pin 3 can be improved. In addition, by processing the joining bone pin 3 by the polymer forging process, the disordered microstructure of the joining bone pin 3 formed by injection molding is changed to an ordered microstructure, and after the joining bone pin 3 is implanted, the internal stress in the joining bone pin 3 is released to cause the joining bone pin 3 to expand, thereby the expanded joining bone pin 3 can fill the gaps and cracks in the bone tunnel 2, thereby improving the stability of the joining and facilitating the healing of the bone tissue 1. In addition, by the polymer forging process, the structure of the joining bone pin 3 can be improved, the toughness and strength of the joining bone pin 3 can be improved, and thus the possibility of breaking of the joining bone pin 3 can be reduced.

[0057] Figure 2 FIG. 1 is a structural schematic view showing a first embodiment of a joining bone pin 3 according to the present application. Figure 3 FIG. 2 is a structural schematic view showing a second embodiment of a joining bone pin 3 according to the present application.

[0058] In some embodiments, referring to Figure 2 or Figure 3 , the joining bone pin 3 can include a pin shaft 31. In some embodiments, the pin shaft 31 can include a main body portion 311. In some embodiments, the diameters of the main body portion 311 can be the same. For example, the pin shaft 31 can have a cylindrical shape. Thus, the processing of the joining bone pin 3 can be facilitated.

[0059] In some embodiments, the shank 31 can be tapered. For example, the shank 31 can be frustoconical. In this case, by increasing the contact area of the engagement bone peg 3 with the first bone tissue 11 and the second bone tissue 12, the stress distribution can be optimized, and the possibility of breakage of the engagement bone peg 3 can be reduced.

[0060] In some embodiments, referring to Figure 2 or Figure 3 , the shank 31 can have a proximal end 312. In some embodiments, the proximal end 312 can be distal to the first bone tissue 11 when engaged. In some embodiments, the shank 31 can have a distal end 313. In some embodiments, the distal end 313 can be proximal to the first bone tissue 11 when engaged. It should be noted that engaged can refer to when the engagement bone peg 3 is not completely implanted in the bone tunnel 2, for example, referring to Figure 1 , when the engagement bone peg 3 is about to be implanted in the bone tunnel 2, the proximal end 312 is closer to the first bone tissue 11 than the distal end 313; after the engagement bone peg 3 is completely implanted in the bone tunnel 2, the proximal end 312 can be located at the first bone tissue 11, and the distal end 313 can be located at the second bone tissue 12, at this time, the proximal end 312 is closer to the first bone tissue 11 than the distal end 313. In other words, during the entire process of implanting the engagement bone peg 3, the relative positional relationship between the proximal end 312 and the distal end 313 and the first bone tissue 11 and the second bone tissue 12 can change, and the above description is only a schematic description and should not be understood as a limitation of the present application. In some embodiments, during the entire process of implanting the engagement bone peg 3, the distal end 313 can enter the bone tunnel 2 first compared to the proximal end 312.

[0061] In some embodiments, referring to Figure 2 or Figure 3 , the engagement bone peg 3 can include a thread 32. In some embodiments, the thread 32 can be provided on the outer surface of the shank 31. Specifically, the thread 32 can be formed on the outer surface of the shank 31. In some embodiments, the shank 31 and the thread 32 can be integrally formed.

[0062] In some embodiments, referring to Figure 2 or Figure 3 , the thread 32 can have a variable pitch. In some embodiments, the pitch of the thread 32 can gradually increase.

[0063] In some embodiments, referring to Figure 2 , the pitch of the thread 32 can gradually increase along the central axis of the shank 31. For example, the pitch of the thread 32 can gradually increase along the implantation direction D.

[0064] In some embodiments, the pitch of the thread 32 can also gradually decrease. In some embodiments, referring to Figure 3The pitch of the thread 32 can also gradually decrease along the central axis of the nail rod 31. For example, the pitch of the thread 32 can gradually decrease along the implantation direction D. In this case, by providing the thread 32 with a gradually changing pitch on the outer surface of the nail rod 31, the first bone tissue 11 and the second bone tissue 12 can be brought closer to each other when the bone engagement nail 3 engages the first bone tissue 11 and the second bone tissue 12, thereby enabling the first bone tissue 11 and the second bone tissue 12 to be tightly fitted, improving the stability of the engagement.

[0065] In some embodiments, referring to Figure 3 , the pitch of the thread 32 near the distal end 313 can be greater than the pitch of the thread 32 near the proximal end 312. In this case, when the proximal end 312 and the distal end 313 of the nail rod 31 are located in the first bone tissue 11 and the second bone tissue 12, respectively, as the nail rod 31 is implanted, the displacement of the portion of the nail rod 31 near the proximal end 312 in the first bone tissue 11 is less than the displacement of the portion of the nail rod 31 near the distal end 313 in the second bone tissue 12 due to the greater pitch of the thread 32 in the distal end 313 portion than the pitch of the thread 32 in the proximal end 312 portion, enabling the first bone tissue 11 to be continuously brought closer to and eventually tightly fitted with the second bone tissue 12, thereby enabling the stability of the engagement to be improved.

[0066] In some embodiments, referring to Figure 2 or Figure 3 , the top end and the bottom end of the thread of the thread 32 can have a rounded corner. Thereby, the damage to the bone tissue 1 when the bone engagement nail 3 is implanted can be reduced.

[0067] In some embodiments, referring to Figure 2 or Figure 3 , the thread 32 can include a first thread 321 and a second thread 322. In some embodiments, the first thread 321 can be near the proximal end 312, and the second thread 322 can be near the distal end 313.

[0068] In some embodiments, the pitch of the first thread 321 is different from the pitch of the second thread 322. Hereinafter, exemplary embodiments are described with the first thread 321 and the second thread 322 as examples.

[0069] In some embodiments, referring to Figure 2 , the rotation direction of the first thread 321 and the second thread 322 can be the same. In some embodiments, when the rotation direction of the first thread 321 and the second thread 322 is the same, the pitch of the first thread 321 can be less than the pitch of the second thread 322 (see Figure 2 ). In this case, when the bone engagement nail 3 is screwed into the first bone tissue 11 and the second bone tissue 12, the first bone tissue 11 can be continuously brought closer to and eventually tightly fitted with the second bone tissue 12, thereby enabling the stability of the engagement to be improved.

[0070] In some embodiments, referring to Figure 3 , the rotation direction of the first thread 321 can be different from that of the second thread 322. In some embodiments, when the rotation direction of the first thread 321 is different from that of the second thread 322, the pitch of the first thread 321 can be greater than that of the second thread 322 (see Figure 3 ).

[0071] It should be noted that when the rotation direction of the first thread 321 is different from that of the second thread 322, the distal end 313 of the engaging bone nail 3 can be screwed into the second bone tissue 12 through the second thread 322 first, then the first bone tissue 11 can be screwed into the proximal end 312 of the engaging bone nail 3 through the first thread 321, and finally the engaging bone nail 3 can be rotated to tightly fit the first bone tissue 11 and the second bone tissue 12.

[0072] In some embodiments, referring to Figure 2 or Figure 3 , the shank 31 can have a first end face 314. In some embodiments, the first end face 314 can be close to the proximal end 312. In some embodiments, the first end face 314 can be oblique to the central axis of the shank 31. In this case, by making the first end face 314 of the shank 31 close to the proximal end 312 oblique to the central axis of the shank 31, after the engaging bone nail 3 is implanted into the oblique bone tunnel 2, the first end face 314 can be matched with the implantation surface 1121 (to be described later) of the first bone tissue 11, which can help to reduce the volume of the part of the shank 31 exposed to the first bone tissue 11 (i.e., the part of the shank 31 exposed to the third bone surface 112), reduce the irritation to other tissues, and thus reduce the possibility of producing an irritation reaction.

[0073] Figure 4 is a schematic view showing the first embodiment of the engaging bone nail 3 involved in the example of the present application in the first bone tissue 11 and the second bone tissue 12.

[0074] In some embodiments, referring to Figure 4 , after the engaging bone nail 3 is implanted into the first bone tissue 11, the first end face 314 can be flush with the third bone surface 112. For example, the angle between the first end face 314 and the central axis of the shank 31 can be equal to the angle between the third bone surface 112 and the central axis of the shank 31. Thus, it can help to reduce the volume of the part of the shank 31 exposed to the third bone surface 112, thereby reducing the possibility of producing an irritation reaction.

[0075] In some embodiments, referring back to Figure 1 , the third bone surface 112 can include an implantation surface 1121. In some embodiments, the implantation surface 1121 can be the part where the bone tunnel 2 intersects with the third bone surface 112, i.e., the part of the third bone surface 112 that is excavated when the bone tunnel 2 is drilled.

[0076] In some embodiments, referring to Figure 4 , the first end surface 314 can match the implant surface 1121 of the first bone tissue 11. In some embodiments, the matching can include that the shape of the first end surface 314 is similar to the shape of the implant surface 1121. For example, the edge profile of the first end surface 314 can be similar to the edge profile of the implant surface 1121. In this case, after the engagement bone peg 3 is implanted, the implant surface 1121 is filled by the first end surface 314, the surface shape of the third bone surface 112 before the bone tunnel 2 is drilled as much as possible is restored, and the possibility of irritation reaction can be reduced.

[0077] In some embodiments, the matching can include that the shape of the first end surface 314 is the same as the shape of the implant surface 1121. In this case, after the engagement bone peg 3 is implanted into the oblique bone tunnel 2, the volume of the part of the peg shank 31 exposed to the first bone tissue 11 is reduced by matching the first end surface 314 with the bone surface (for example, the third bone surface 112), and the possibility of irritation reaction can be further reduced.

[0078] In some embodiments, the angle between the central axis of the peg shank 31 and the first end surface 314 can be 20 degrees to 70 degrees. Preferably, the angle between the central axis of the peg shank 31 and the first end surface 314 can be 30 degrees to 50 degrees. For example, the angle between the central axis of the peg shank 31 and the first end surface 314 can be 30 degrees, 40 degrees, 45 degrees and 50 degrees. In this way, the application range of the engagement bone peg 3 can be expanded. However, the present application is not limited thereto, and in some embodiments, the angle between the central axis of the peg shank 31 and the first end surface 314 can be any angle.

[0079] In some embodiments, referring to Figure 2 , Figure 3 or Figure 4 , the peg shank 31 can have a second end surface 315. In some embodiments, the second end surface 315 can be a plane.

[0080] In addition, in some embodiments, the second end surface 315 can be an inclined surface, that is, the second end surface 315 can be oblique to the central axis of the peg shank 31. In this case, when the engagement bone peg 3 penetrates the second bone tissue 12, the second end surface 315 can be matched with the bone surface of the second bone tissue 12, thereby reducing the possibility of irritation reaction.

[0081] It should be noted that the description of the first end surface 314 being an inclined surface to reduce the possibility of irritation reaction also applies to the second end surface 315, which will not be described here.

[0082] In some embodiments, referring to Figure 2 , Figure 3 or Figure 4In some embodiments, referring to FIG. 1 1, the shank 31 can further include a smooth surface 316. In some embodiments, the smooth surface 316 can be a surface of the shank 31 that does not have the thread 32. In some embodiments, the smooth surface 316 can be disposed between the proximal end 312 and the distal end 313. In this case, since bone debris can be generated in the first bone tissue 1 1 and the second bone tissue 12 during the rotational implantation, when the proximal end 312 and the distal end 313 of the shank 31 are located in the first bone tissue 1 1 and the second bone tissue 12, respectively, by disposing the smooth surface 316 between the proximal end 312 and the distal end 313, the bone debris can be guided by the thread 32 to approach the smooth surface 316 and enter the gap between the first bone tissue 1 1 and the second bone tissue 12, thereby promoting the healing of the first bone tissue 1 1 and the second bone tissue 12.

[0083] In some embodiments, referring to FIG. 1 1, the shank 31 can include a pointed end 317. In this way, the engagement of the bone peg 3 with the bone tissue 1 can be facilitated. In some embodiments, the pointed end 317 can be proximate to the distal end 313. Figure 2 Figure 3 In some embodiments, referring to FIG. 1 1, the shank 31 can include a pointed end 317. In this way, the engagement of the bone peg 3 with the bone tissue 1 can be facilitated. In some embodiments, the pointed end 317 can be proximate to the distal end 313.

[0084] Figure 5 FIG. 1 1 is a view showing the engagement of the bone peg 3 along the implantation direction D according to an example of the present application. Figure 6 FIG. 1 1 is a view showing the engagement of the bone peg 3 along the implantation direction D according to an example of the present application. Figure 5 FIG. 1 1 is a view showing the engagement of the bone peg 3 along the implantation direction D according to an example of the present application. Figure 7 FIG. 1 1 is a view showing the engagement of the bone peg 3 along the implantation direction D according to an example of the present application.

[0085] In some embodiments, referring to FIG. 1 1, the shank 31 can include a pointed end 317. In this way, the engagement of the bone peg 3 with the bone tissue 1 can be facilitated. In some embodiments, the pointed end 317 can be proximate to the distal end 313. Figure 5 Figure 6 In some embodiments, referring to FIG. 1 1, the shank 31 can include a pointed end 317. In this way, the engagement of the bone peg 3 with the bone tissue 1 can be facilitated. In some embodiments, the pointed end 317 can be proximate to the distal end 313.

[0086] In some embodiments, referring to FIG. 1 1, the shank 31 can include a pointed end 317. In this way, the engagement of the bone peg 3 with the bone tissue 1 can be facilitated. In some embodiments, the pointed end 317 can be proximate to the distal end 313. Figure 6

[0087] In some embodiments, referring to FIG. 1 1, the shank 31 can include a pointed end 317. In this way, the engagement of the bone peg 3 with the bone tissue 1 can be facilitated. In some embodiments, the pointed end 317 can be proximate to the distal end 313. Figure 5 ​​​In some embodiments, referring to FIG. 1, the first channel 318 can have a cross section in the shape of a hexagon. In this case, by setting the cross section of the first channel 318 in the shape of a hexagon, the processing of the first channel 318 can be facilitated, and the stress between the engagement bone nail 3 and the auxiliary tool can be uniformly dispersed, thereby reducing the possibility of the engagement bone nail 3 being twisted and deformed due to stress.

[0088] In some embodiments, referring to FIG. 1, the first channel 318 can have a tapered portion 3181. In this case, by setting the tapered portion 3181 in the first channel 318, the contact area of the first channel 318 with the auxiliary tool can be increased, thereby optimizing the stress distribution and reducing the possibility of the engagement bone nail 3 being twisted and deformed. Figure 6

[0089] In some embodiments, referring to FIG. 1, the first channel 318 can have a tapered portion 3181. In this case, by setting the tapered portion 3181 in the first channel 318, the contact area of the first channel 318 with the auxiliary tool can be increased, thereby optimizing the stress distribution and reducing the possibility of the engagement bone nail 3 being twisted and deformed. Figure 7 In some embodiments, referring to FIG. 1, the nail shaft 31 can have a second channel 319. In some embodiments, the second channel 319 can be in communication with the first channel 318. In this way, the guide tool (not shown) can guide the engagement bone nail 3 to the designated position of the bone tissue 1, thereby improving the accuracy of positioning the engagement bone nail 3. In some embodiments, the guide tool can be a guide wire or a Kirschner wire.

[0090] Figure 7 In some embodiments, referring to FIG. 1, the second channel 319 can have a diameter smaller than that of the first channel 318. In this way, the possibility of the auxiliary tool entering the second channel 319 from the first channel 318 can be reduced, thereby reducing the possibility of the auxiliary tool penetrating the engagement bone nail 3.

[0091] In some embodiments, the cross section of the second channel 319 can be in the shape of a hexagon. In some embodiments, when the second channel 319 penetrates the tip portion 317, the nail shaft 31 can not have the second end face 315 (see FIG. 1). Figure 7

[0092] In the present application, by setting the thread 32 with a gradually changing pitch on the outer surface of the nail shaft 31 of the engagement bone nail 3, when the engagement bone nail 3 engages the first bone tissue 11 and the second bone tissue 12, the first bone tissue 11 and the second bone tissue 12 can be caused to relatively displace to make the first bone tissue 11 and the second bone tissue 12 approach each other, thereby making the first bone tissue 11 and the second bone tissue 12 closely fit, improving the stability of the engagement. In addition, by making the first end face 314 of the nail shaft 31 close to the proximal end 312 obliquely intersect with the central axis of the nail shaft 31, after the engagement bone nail 3 is implanted into the oblique bone tunnel 2, the volume of the portion of the nail shaft 31 exposed to the first bone tissue 11 can be reduced, the irritation to other tissues can be reduced, and the possibility of an irritation reaction occurring can be reduced.

[0093] ​​​In all of the examples shown and described herein, any specific values should be interpreted as merely exemplary and not as limiting, and thus other examples of the exemplary embodiments can have different values.

[0094] It should be noted that like reference numerals and letters refer to like items throughout the several views, and once an item is defined in one view, it is not necessary to further define and explain it in the subsequent views.

[0095] The above-described embodiments are merely illustrative for the present application and do not restrict the scope of the present application. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these should be within the scope of the present application.

Claims

1. A connecting bone screw for connecting first bone tissue and second bone tissue, characterized in that, The connecting bone screw includes: A nail bar, the outer surface of which has threads, the pitch of which gradually increases or decreases along the central axis of the nail bar; The pin has a proximal end and a distal end, the proximal end being away from the first bone tissue and the distal end being close to the first bone tissue. The pin has a first end face that is oblique to the central axis of the pin and close to the proximal end.

2. The connecting bone screw according to claim 1, characterized in that, The pitch of the thread closer to the distal end is greater than the pitch of the thread closer to the proximal end.

3. The connecting bone screw according to claim 1, characterized in that, The shape of the first end face is the same as the shape of the implantation surface of the first bone tissue.

4. The connecting bone screw according to claim 1, characterized in that, The angle between the central axis of the nail rod and the first end face is A, and satisfies: 20°≤A≤70°.

5. The connecting bone screw according to claim 1, characterized in that, The connecting bone screw is made of inorganic and absorbable materials.

6. The connecting bone screw according to claim 1, characterized in that, The nail bar includes a tip portion located at the distal end.

7. The connecting bone screw according to claim 1, characterized in that, The nail rod includes a main body, which is tapered or the main body is of equal diameter.

8. The connecting bone screw according to claim 1, characterized in that, The nail bar also includes a smooth surface disposed on the portion of the nail bar located between the proximal end and the distal end.

9. The connecting bone screw according to claim 1, characterized in that, The nail bar has a first channel, and the first channel has a tapering portion.

10. The connecting bone screw according to claim 9, characterized in that, The cross-section of the first channel is hexagonal.

Images