Tail cap, locking piece, intramedullary nail main nail, intramedullary nail assembly and implantation assembly

Abstract

The invention discloses a tail cap, a locking piece, an intramedullary nail main nail, an intramedullary nail assembly and an implantation assembly. According to the intramedullary nail assembly, in the time period when the locking part of the tail cap starts to be locked with the third hole section of the main intramedullary nail, the first surface of the main intramedullary nail guides the first guide part of the tail cap, and the second surface of the main intramedullary nail guides the second guide part of the tail cap, or the locking part of the tail cap is locked with the third hole section of the main intramedullary nail. The third guide part of the tail cap is guided by the third surface of the main intramedullary nail, and the second guide part of the tail cap is guided by the second surface of the main intramedullary nail, so that the locking part of the tail cap can be locked with the third hole section of the main intramedullary nail in a time period when the locking part of the tail cap begins to be locked with the third hole section of the main intramedullary nail; the overlap ratio of the axis of the tail cap and the axis of the third hole section of the main nail of the intramedullary nail is effectively improved, so that the risk that the locking part of the tail cap is pinned by the hole of the main nail of the intramedullary nail and cannot be continuously inserted is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a tail cap, a locking member, an intramedullary nail main nail, an intramedullary nail assembly and an implant assembly. Background Art

[0002] In intramedullary nail fixation surgery, the main nail of the intramedullary nail assembly is generally implanted into the bone, and then the tail cap is inserted into the hole of the main nail of the intramedullary nail, so that the locking part of the tail cap is locked with the hole of the main nail of the intramedullary nail. During clinical use, due to reasons such as patient obesity and incorrect surgical posture, when the locking part of the tail cap is inserted into the hole of the main nail of the intramedullary nail and locked with the hole, the axis of the tail cap may have a large deviation angle relative to the axis of the hole of the main nail of the intramedullary nail, resulting in the risk that the locking part of the tail cap is pinned by the hole of the main nail of the intramedullary nail and cannot be inserted further, resulting in poor stability of the intramedullary nail assembly. In severe cases, the locking part of the tail cap may be damaged and the tail cap needs to be replaced. Summary of the invention

[0003] The embodiments of the present application provide a tail cap, a locking piece, an intramedullary nail, an intramedullary nail assembly and an implant assembly, which are intended to solve the problem that when the locking portion of the tail cap is inserted into the hole of the intramedullary nail and locked with the hole, the axis of the tail cap may have a large deviation angle relative to the axis of the hole of the intramedullary nail, causing the locking portion of the tail cap to be stuck in the hole of the intramedullary nail and unable to continue to be inserted.

[0004] In a first aspect, an embodiment of the present application provides an intramedullary nail assembly, comprising:

[0005] An intramedullary nail main nail, comprising a proximal end and a distal end opposite to each other, the intramedullary nail main nail comprising an inner surface extending between the proximal end and the distal end, the inner surface comprising a first surface, a second surface and a third surface, the first surface encloses a first hole segment, the second surface encloses a second hole segment, and the third surface encloses a third hole segment;

[0006] A tail cap, comprising a head end and a tail end opposite to each other, the tail cap comprising a first guide portion, a second guide portion and a locking portion, the diameter of the circumscribed circle of the radial cross section of the first guide portion is d1, the diameter of the circumscribed circle of the radial cross section of the second guide portion is d2, d1>d2;

[0007] The first guide portion is used to be inserted into the first hole segment, the second guide portion is used to be inserted into the second hole segment, and the locking portion is used to be inserted into the third hole segment and locked with the third hole segment;

[0008] Wherein, the third hole segment, the first hole segment and the second hole segment are sequentially distributed along the direction from the proximal end to the distal end, and the locking portion, the first guide portion and the second guide portion are sequentially distributed along the direction from the head end to the tail end; or, the first hole segment, the second hole segment and the third hole segment are sequentially distributed along the direction from the proximal end to the distal end, and the first guide portion, the second guide portion and the locking portion are sequentially distributed along the direction from the head end to the tail end;

[0009] During the period when the locking portion begins to lock with the third hole segment, at least a portion of the second guide portion is inserted into the second hole segment, and the second surface abuts against the second guide portion to guide the second guide portion;

[0010] Wherein, at least part of the first guide portion is inserted into the first hole section, and the first surface abuts against the first guide portion to guide the first guide portion, or, at least part of the first guide portion is inserted into the third hole section, and the third surface abuts against the first guide portion to guide the first guide portion.

[0011] In a second aspect, an embodiment of the present application provides an intramedullary nail assembly, comprising:

[0012] An intramedullary nail main nail, comprising a proximal end and a distal end opposite to each other, the intramedullary nail main nail comprising an inner surface extending between the proximal end and the distal end, the inner surface comprising a fourth surface, a fifth surface and a sixth surface, the fourth surface encloses a fourth hole segment, the fifth surface encloses a fifth hole segment, the sixth surface encloses a sixth hole segment, the fourth hole segment and the fifth hole segment are sequentially distributed along the direction from the proximal end to the distal end, and the sixth hole segment is the first locking hole of the intramedullary nail main nail along the direction from the proximal end to the distal end;

[0013] A tail cap, comprising a head end and a tail end opposite to each other, the tail cap comprising a first guide portion, a second guide portion and a locking portion, the first guide portion and the second guide portion being sequentially distributed along the direction from the head end to the tail end, the circumscribed circle diameter of the radial cross section of the first guide portion being d1, the circumscribed circle diameter of the radial cross section of the second guide portion being d2, d1>d2; the first guide portion is used to be inserted into the fourth hole segment, the second guide portion is used to be inserted into the fifth hole segment, and the locking portion is used to be inserted into the sixth hole segment and locked with the sixth hole segment;

[0014] During the period when the locking portion begins to lock with the sixth hole segment, at least a portion of the first guide portion is inserted into the fourth hole segment, and the fourth surface is used to abut against the first guide portion to guide the first guide portion;

[0015] Wherein, at least a portion of the second guide portion is inserted into the fifth hole segment, and the fifth surface is used to abut against the second guide portion to guide the second guide portion; or, at least a portion of the second guide portion is inserted into the sixth hole segment, and the sixth surface is used to abut against the second guide portion to guide the second guide portion.

[0016] In a third aspect, an embodiment of the present application provides a tail cap, the tail cap being used to be connected to a main nail of an intramedullary nail, the main nail of the intramedullary nail comprising a proximal end and a distal end opposite to each other, the main nail of the intramedullary nail comprising an inner surface extending between the proximal end and the distal end, the inner surface comprising a first surface, a second surface and a third surface, the first surface encloses a first hole segment, the second surface encloses a second hole segment, and the third surface encloses a third hole segment;

[0017] The tail cap includes a head end and a tail end opposite to each other, and includes a first guide portion, a second guide portion and a locking portion, the diameter of the circumscribed circle of the radial cross section of the first guide portion is d1, the diameter of the circumscribed circle of the radial cross section of the second guide portion is d2, and d1>d2;

[0018] The first guide portion is used to insert into the first hole segment, the second guide portion is used to insert into the second hole segment, and the locking portion is used to insert into the third hole segment and lock with the third hole segment; wherein the third hole segment, the first hole segment and the second hole segment are sequentially distributed along the direction from the proximal end to the distal end, and the locking portion, the first guide portion and the second guide portion are sequentially distributed along the direction from the head end to the tail end; or, the first hole segment, the second hole segment and the third hole segment are sequentially distributed along the direction from the proximal end to the distal end, and the first guide portion, the second guide portion and the locking portion are sequentially distributed along the direction from the head end to the tail end;

[0019] During the time period when the locking portion begins to lock with the third hole segment, at least a portion of the second guide portion is inserted into the second hole segment, and the second surface abuts against the second guide portion to guide the second guide portion, at least a portion of the first guide portion is inserted into the first hole segment, and the first surface abuts against the first guide portion to guide the first guide portion, or at least a portion of the first guide portion is inserted into the third hole segment, and the third surface abuts against the first guide portion to guide the first guide portion.

[0020] In a fourth aspect, an embodiment of the present application provides a tail cap, the tail cap being used to be connected to a main nail of an intramedullary nail, the main nail of the intramedullary nail comprising a proximal end and a distal end opposite to each other, the main nail of the intramedullary nail comprising an inner surface extending between the proximal end and the distal end, the inner surface comprising a fourth surface, a fifth surface and a sixth surface, the fourth surface encloses a fourth hole segment, the fifth surface encloses a fifth hole segment, the sixth surface encloses a sixth hole segment, the fourth hole segment and the fifth hole segment are sequentially distributed along the direction from the proximal end to the distal end, the sixth hole segment being the first locking hole of the main nail of the intramedullary nail along the direction from the proximal end to the distal end;

[0021] The tail cap comprises a head end and a tail end opposite to each other, the tail cap comprises a first guide portion, a second guide portion and a locking portion, the first guide portion and the second guide portion are sequentially distributed along the direction from the head end to the tail end, the circumscribed circle diameter of the radial cross section of the first guide portion is d1, the circumscribed circle diameter of the radial cross section of the second guide portion is d2, d1>d2; the first guide portion is used to insert into the fourth hole segment, the second guide portion is used to insert into the fifth hole segment, and the locking portion is used to insert into the sixth hole segment and lock with the sixth hole segment;

[0022] Wherein, during the time period when the locking portion begins to lock with the sixth hole segment, at least a portion of the first guide portion is inserted into the fourth hole segment, and the fourth surface is used to abut against the first guide portion to guide the first guide portion, and at least a portion of the second guide portion is inserted into the fifth hole segment, and the fifth surface is used to abut against the second guide portion to guide the second guide portion; or, at least a portion of the second guide portion is inserted into the sixth hole segment, and the sixth surface is used to abut against the second guide portion to guide the second guide portion.

[0023] In a fifth aspect, an embodiment of the present application provides an intramedullary nail main nail, the intramedullary nail main nail is used to be connected to a tail cap, the tail cap includes a head end and a tail end opposite to each other, the tail cap includes a first guide portion, a second guide portion and a locking portion, the diameter of the circumscribed circle of the radial cross section of the first guide portion is d1, the diameter of the circumscribed circle of the radial cross section of the second guide portion is d2, d1>d2;

[0024] The main intramedullary nail comprises a proximal end and a distal end opposite to each other, the main intramedullary nail comprises an inner surface extending between the proximal end and the distal end, the inner surface comprises a first surface, a second surface and a third surface, the first surface encloses a first hole segment, the second surface encloses a second hole segment, the third surface encloses a third hole segment, the first hole segment is used for the first guide portion to be inserted, the second hole segment is used for the second guide portion to be inserted, and the third hole segment is used for the locking portion to be inserted and locked with the locking portion;

[0025] During the time period when the locking portion begins to lock with the third hole segment, at least a portion of the second guide portion is inserted into the second hole segment, and the second surface abuts against the second guide portion to guide the second guide portion, at least a portion of the first guide portion is inserted into the first hole segment, and the first surface abuts against the first guide portion to guide the first guide portion, or at least a portion of the first guide portion is inserted into the third hole segment, and the third surface abuts against the first guide portion to guide the first guide portion;

[0026] Wherein, the third hole segment, the first hole segment and the second hole segment are sequentially distributed along the direction from the proximal end to the distal end, and the locking portion, the first guide portion and the second guide portion are sequentially distributed along the direction from the head end to the tail end; or,

[0027] wherein the first hole segment, the second hole segment and the third hole segment are sequentially distributed along the direction from the proximal end to the distal end, and the first guide portion, the second guide portion and the locking portion are sequentially distributed along the direction from the head end to the tail end; or,

[0028] Among them, the third hole segment is the first locking hole of the main nail of the intramedullary nail along the direction from the proximal end to the distal end, and the first hole segment, the third hole segment and the second hole segment are distributed in sequence along the direction from the proximal end to the distal end, and the first guide part, the locking part and the second guide part are distributed in sequence along the direction from the head end to the tail end.

[0029] In a sixth aspect, an embodiment of the present application provides an intramedullary nail assembly, comprising:

[0030] An intramedullary nail main nail, comprising a proximal end and a distal end opposite to each other, the intramedullary nail main nail comprising an inner surface extending between the proximal end and the distal end, the inner surface comprising a second surface and a third surface, the second surface encloses a second hole segment, the third surface encloses a third hole segment, the third hole segment and the second hole segment are sequentially distributed along the direction from the proximal end to the distal end;

[0031] A tail cap, comprising an opposite head end and a tail end, the tail cap comprising a first guide portion, a second guide portion and a locking portion, the locking portion, the first guide portion and the second guide portion being sequentially distributed along the direction from the head end to the tail end, the first guide portion being used to insert the third hole segment, the second guide portion being used to insert the second hole segment, and the locking portion being used to insert the third hole segment and lock with the third hole segment; the circumscribed circle diameter of the radial cross section of the first guide portion is d1, the circumscribed circle diameter of the radial cross section of the second guide portion is d2, d1>d2; the length of the locking portion in the direction from the head end to the tail end is less than the length of the third hole segment in the direction from the proximal end to the distal end;

[0032] Wherein, during the time period when the locking portion begins to lock with the third hole segment, at least a portion of the first guide portion is inserted into the third hole segment, and the third surface abuts against the first guide portion to guide the first guide portion, and at least a portion of the second guide portion is inserted into the second hole segment, and the second surface abuts against the second guide portion to guide the second guide portion.

[0033] In a seventh aspect, an embodiment of the present application provides an implant assembly, comprising:

[0034] An implant, comprising a proximal end and a distal end opposite to each other, the implant comprising an inner surface extending between the proximal end and the distal end, the inner surface comprising a first surface, a second surface and a third surface, the first surface enclosing a first hole segment, the second surface enclosing a second hole segment, and the third surface enclosing a third hole segment;

[0035] A locking member, comprising a head end and a tail end opposite to each other, the locking member comprising a first guide portion, a second guide portion and a locking portion, the diameter of the circumscribed circle of the radial cross section of the first guide portion is d1, the diameter of the circumscribed circle of the radial cross section of the second guide portion is d2, d1>d2; the first guide portion is used to be inserted into the first hole segment, the second guide portion is used to be inserted into the second hole segment, and the locking portion is used to be inserted into the third hole segment and locked with the third hole segment;

[0036] During the time period when the locking portion begins to lock with the third hole segment, at least a portion of the second guide portion is inserted into the second hole segment, and the second surface abuts against the second guide portion to guide the second guide portion, at least a portion of the first guide portion is inserted into the first hole segment, and the first surface abuts against the first guide portion to guide the first guide portion, or at least a portion of the first guide portion is inserted into the third hole segment, and the third surface abuts against the first guide portion to guide the first guide portion;

[0037] Wherein, the locking portion, the first guide portion and the second guide portion are sequentially distributed along the direction from the head end to the tail end, and the third hole segment, the first hole segment and the second hole segment are sequentially distributed along the direction from the proximal end to the distal end; or,

[0038] Wherein, the first guide portion, the second guide portion and the locking portion are sequentially distributed along the direction from the head end to the tail end, and the first hole segment, the second hole segment and the third hole segment are sequentially distributed along the direction from the proximal end to the distal end; or,

[0039] Among them, the third hole segment is the first locking hole of the implant along the direction from the proximal end to the distal end, and the first guide portion, the locking portion and the second guide portion are distributed in sequence along the direction from the head end to the tail end, and the first hole segment, the third hole segment and the second hole segment are distributed in sequence along the direction from the proximal end to the distal end.

[0040] In an eighth aspect, an embodiment of the present application provides a locking member, the locking member being used to connect with an implant, the implant comprising a proximal end and a distal end opposite to each other, the implant comprising an inner surface extending between the proximal end and the distal end, the inner surface comprising a first surface, a second surface and a third surface, the first surface encloses a first hole segment, the second surface encloses a second hole segment, and the third surface encloses a third hole segment;

[0041] The locking member comprises a head end and a tail end opposite to each other, and the locking member comprises a first guide portion, a second guide portion and a locking portion, the diameter of the circumscribed circle of the radial cross section of the first guide portion is d1, the diameter of the circumscribed circle of the radial cross section of the second guide portion is d2, and d1>d2; the first guide portion is used to be inserted into the first hole segment, the second guide portion is used to be inserted into the second hole segment, and the locking portion is used to be inserted into the third hole segment and locked with the third hole segment;

[0042] During the time period when the locking portion begins to lock with the third hole segment, at least a portion of the second guide portion is inserted into the second hole segment, and the second surface abuts against the second guide portion to guide the second guide portion, at least a portion of the first guide portion is inserted into the first hole segment, and the first surface abuts against the first guide portion to guide the first guide portion, or at least a portion of the first guide portion is inserted into the third hole segment, and the third surface abuts against the first guide portion to guide the first guide portion;

[0043] Wherein, the locking portion, the first guide portion and the second guide portion are sequentially distributed along the direction from the head end to the tail end, and the third hole segment, the first hole segment and the second hole segment are sequentially distributed along the direction from the proximal end to the distal end; or,

[0044] Wherein, the first guide portion, the second guide portion and the locking portion are sequentially distributed along the direction from the head end to the tail end, and the first hole segment, the second hole segment and the third hole segment are sequentially distributed along the direction from the proximal end to the distal end; or,

[0045] Among them, the third hole segment is the first locking hole of the implant along the direction from the proximal end to the distal end, and the first guide portion, the locking portion and the second guide portion are distributed in sequence along the direction from the head end to the tail end, and the first hole segment, the third hole segment and the second hole segment are distributed in sequence along the direction from the proximal end to the distal end.

[0046] In a ninth aspect, an embodiment of the present application provides an implant, the implant being used to connect with a locking member, the locking member comprising a head end and a tail end opposite to each other, the locking member comprising a first guide portion, a second guide portion and a locking portion, the circumscribed circle diameter of a radial cross section of the first guide portion being d1, the circumscribed circle diameter of a radial cross section of the second guide portion being d2, d1>d2;

[0047] The implant comprises a proximal end and a distal end opposite to each other, the implant comprises an inner surface extending between the proximal end and the distal end, the inner surface comprises a first surface, a second surface and a third surface, the first surface encloses a first hole segment, the second surface encloses a second hole segment, and the third surface encloses a third hole segment; the first hole segment is used for inserting the first guide portion, the second hole segment is used for inserting the second guide portion, and the third hole segment is used for inserting the locking portion and locking with the locking portion;

[0048] During the time period when the locking portion begins to lock with the third hole segment, at least a portion of the second guide portion is inserted into the second hole segment, and the second surface abuts against the second guide portion to guide the second guide portion, at least a portion of the first guide portion is inserted into the first hole segment, and the first surface abuts against the first guide portion to guide the first guide portion, or at least a portion of the first guide portion is inserted into the third hole segment, and the third surface abuts against the first guide portion to guide the first guide portion;

[0049] Wherein, the third hole segment, the first hole segment and the second hole segment are sequentially distributed along the direction from the proximal end to the distal end, and the locking portion, the first guide portion and the second guide portion are sequentially distributed along the direction from the head end to the tail end; or,

[0050] wherein the first hole segment, the second hole segment and the third hole segment are sequentially distributed along the direction from the proximal end to the distal end, and the first guide portion, the second guide portion and the locking portion are sequentially distributed along the direction from the head end to the tail end; or,

[0051] Among them, the third hole segment is the first locking hole of the implant along the direction from the proximal end to the distal end, and the first hole segment, the third hole segment and the second hole segment are distributed in sequence along the direction from the proximal end to the distal end, and the first guide portion, the locking portion and the second guide portion are distributed in sequence along the direction from the head end to the tail end.

[0052] The intramedullary nail assembly provided in the embodiment of the present application can effectively improve the overlap between the axis of the tail cap and the axis of the third hole segment of the main nail of the intramedullary nail during the time period when the locking portion of the tail cap begins to lock with the third hole segment of the main nail of the intramedullary nail, thereby reducing the risk that the locking portion of the tail cap is stuck in the hole of the main nail of the intramedullary nail and cannot be inserted further. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0054] Figure 1 A schematic structural diagram of an embodiment of a main intramedullary nail provided in an embodiment of the present application;

[0055] Figure 2 A schematic structural diagram of a first embodiment of an intramedullary nail assembly provided in an embodiment of the present application;

[0056] Figure 3 for Figure 2 Schematic diagram of the process of inserting the middle tail cap into the hole of the main nail of the intramedullary nail;

[0057] Figure 4 A schematic structural diagram of a second embodiment of an intramedullary nail assembly provided in an embodiment of the present application;

[0058] Figure 5 for Figure 4 Schematic diagram of the process of inserting the middle tail cap into the hole of the main nail of the intramedullary nail;

[0059] Figure 6 A schematic structural diagram of a third embodiment of an intramedullary nail assembly provided in an embodiment of the present application;

[0060] Figure 7 for Figure 6 Schematic diagram of the process of inserting the middle tail cap into the hole of the main nail of the intramedullary nail;

[0061] Figure 8 A schematic structural diagram of a fourth embodiment of an intramedullary nail assembly provided in an embodiment of the present application;

[0062] Fig. 9 for Figure 8 Schematic diagram of the process of inserting the middle tail cap into the hole of the main nail of the intramedullary nail;

[0063] Fig.10 for Figure 8 The enlarged view of point A in the middle;

[0064] Fig.11 A schematic structural diagram of a fifth embodiment of an intramedullary nail assembly provided in an embodiment of the present application;

[0065] Fig.12 for Fig.11 Schematic diagram of the process of inserting the middle tail cap into the hole of the main nail of the intramedullary nail;

[0066] Fig.13 A schematic structural diagram of a sixth embodiment of an intramedullary nail assembly provided in an embodiment of the present application;

[0067] Fig.14 for Fig.13 The enlarged view of point B in the middle;

[0068] Fig.15 This is a schematic structural diagram of the seventh embodiment of the intramedullary nail assembly provided in the embodiments of the present application.

[0069] Intramedullary nail assembly 100; tail cap 110; head end 1101; tail end 1102; first guide portion 111; second guide portion 112; locking portion 113; fourth end 1112; fifth end 1121; sixth end 1131; backing groove 114; first side 1141; first edge 1143; second edge 1144; second side 1142; third edge 1145; fourth edge 1146; intramedullary nail main nail 120; proximal end 1201; distal end 1202; inner surface 1 203; first surface 1204; second surface 1205; third surface 1206; hole 1200; first hole section 121; second hole section 122; third hole section 123; fourth surface 1207; fifth surface 1208; sixth surface 1209; fourth hole section 124; fifth hole section 125; sixth hole section 126; seventh end 1241; eighth end 1251; ninth end 1261; first end 1211; second end 1221; third end 1231; chamfer 1222. DETAILED DESCRIPTION

[0070] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0071] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may 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 clearly and specifically defined.

[0072] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0073] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0074] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides various specific processes and examples of materials, but those of ordinary skill in the art can appreciate the application of other processes and / or the use of other materials.

[0075] The embodiments of the present application provide a tail cap, a locking member, an intramedullary nail, an intramedullary nail assembly and an implant assembly, which are described in detail below.

[0076] First, an embodiment of the present application provides an intramedullary nail assembly.

[0077] Figure 1 A schematic structural diagram of an embodiment of the main intramedullary nail provided in an embodiment of the present application. Figure 2 This is a schematic diagram of the structure of the first embodiment of the intramedullary nail assembly provided in the present application. Figure 1 and Figure 2 As shown, the intramedullary nail assembly 100 includes an intramedullary nail main nail 120 and a tail cap 110, the intramedullary nail main nail 120 includes a relative proximal end 1201 and a distal end 1202, the intramedullary nail main nail 120 includes an inner surface 1203 extending between the proximal end 1201 and the distal end 1202, and the inner surface 1203 encloses a hole 1200 extending from the proximal end 1201 of the intramedullary nail main nail 120 to the distal end 1202. The hole 1200 formed by the inner surface 1203 extends from the proximal end 1201 of the intramedullary nail main nail 120 to the distal end 1202 of the intramedullary nail main nail 120, and openings are respectively formed at the proximal end 1201 and the distal end 1202 of the intramedullary nail main nail 120, that is, the inner surface 1203 of the intramedullary nail main nail 120 extends between the proximal end 1201 and the distal end 1202 of the intramedullary nail main nail 120, and the inner surface 1203 of the intramedullary nail main nail 120 extends between the proximal end 1201 and the distal end 1202 of the intramedullary nail main nail 120 and encloses a through hole extending along the length direction of the intramedullary nail main nail 120, so as to facilitate the surgeon to pass the guide needle or other medical instruments through the hole 1200 of the intramedullary nail main nail 120 for operation.

[0078] The tail cap 110 includes a head end 1101 and a tail end 1102 opposite to each other. The tail end 1102 of the tail cap 110 is used to be inserted into the hole 1200 of the intramedullary nail main nail 120 from the proximal end 1201 of the intramedullary nail main nail 120 to close the hole 1200 of the intramedullary nail main nail 120. The tail cap 110 includes a locking portion 113. The locking portion 113 of the tail cap 110 is used to be inserted into the hole 1200 of the intramedullary nail main nail 120 and locked with the hole 1200 of the intramedullary nail main nail 120 to stably fix the tail cap 110 to the proximal end 1201 of the intramedullary nail main nail 120.

[0079] In an intramedullary nail fixation operation, the intramedullary nail main nail 120 of the intramedullary nail assembly 100 is generally implanted into the bone, and then the tail cap 110 is inserted into the hole 1200 of the intramedullary nail main nail 120 so that the locking portion 113 of the tail cap 110 is locked with the hole 1200 of the intramedullary nail main nail 120. During clinical use, due to reasons such as patient obesity and incorrect surgical position, when the locking portion 113 of the tail cap 110 is inserted into the hole 1200 of the main nail 120 of the intramedullary nail and locked with the hole 1200, the axis of the tail cap 110 may have a large deviation angle relative to the axis of the hole 1200 of the main nail 120 of the intramedullary nail, resulting in the risk of the locking portion 113 of the tail cap 110 being pinned by the hole 1200 of the main nail 120 of the intramedullary nail and unable to continue to be inserted, resulting in poor stability of the intramedullary nail assembly 100. In severe cases, the locking portion 113 of the tail cap 110 may be damaged, requiring the tail cap 110 to be replaced.

[0080] In order to avoid the above problems, the present application provides an intramedullary nail assembly. Figure 2 and Figure 3 As shown, the inner surface 1203 of the main nail 120 of the intramedullary nail includes a first surface 1204, a second surface 1205 and a third surface 1206. The first surface 1204 encloses a first hole section 121, the second surface 1205 encloses a second hole section 122, and the third surface 1206 encloses a third hole section 123. The first hole section 121, the second hole section 122 and the third hole section 123 are distributed at different positions in the length direction of the main nail 120 of the intramedullary nail. The tail cap 110 includes a first guide portion 111, a second guide portion 112 and a locking portion 113. The first guide portion 111 is used to insert into the first hole section 121, the second guide portion 112 is used to insert into the second hole section 122, and the locking portion 113 is used to insert into the third hole section 123 and lock with the third hole section 123. The first guide portion 111, the second guide portion 112 and the locking portion 113 of the tail cap 110 are distributed at different positions in the length direction of the tail cap 110.

[0081] Continue to refer to Figure 2 and Figure 3, the first hole section 121 and the second hole section 122 of the main nail 120 of the intramedullary nail are sequentially distributed along the direction X from the proximal end 1201 to the distal end 1202. The first guide portion 111 and the second guide portion 112 of the tail cap 110 are sequentially distributed along the direction X from the head end 1101 to the tail end 1102. The circumscribed circle diameter d1 of the radial cross section of the first guide portion 111 of the tail cap 110 is different from the circumscribed circle diameter d2 of the radial cross section of the second guide portion 112. Among them, the circumscribed circle diameter of the radial cross section of the first guide portion 111 is d1, and the circumscribed circle diameter of the radial cross section of the second guide portion 112 is d2, so that d1>d2. It should be noted that the radial cross section of the first guide portion 111 of the tail cap 110 can be circular or non-circular. When the radial cross section of the first guide portion 111 of the tail cap 110 is circular, the diameter of the radial cross section is the circumscribed circle diameter.

[0082] During the time period when the locking portion 113 of the tail cap 110 begins to lock with the third hole section 123 of the intramedullary nail main nail 120, at least a portion of the first guide portion 111 and at least a portion of the second guide portion 112 of the tail cap 110 are inserted into the hole 1200 of the intramedullary nail main nail 120, and the inner surface 1203 of the intramedullary nail main nail 120 abuts against the first guide portion 111 and the second guide portion 112, respectively, to guide the first guide portion 111 and the second guide portion 112.

[0083] The locking of the locking portion 113 of the tail cap 110 and the third hole section 123 of the main nail 120 of the intramedullary nail is a continuous process, and the time point when the locking portion 113 of the tail cap 110 starts to cooperate with the locking structure in the third hole section 123 of the main nail 120 of the intramedullary nail is the starting time point, and the period of time after the starting time point is the time period when the locking portion 113 of the tail cap 110 starts to lock with the third hole section 123 of the main nail 120 of the intramedullary nail. For example, when the locking portion 113 is a threaded section and the third hole section 123 is a threaded hole section, the time point when the external thread of the threaded section of the locking portion 113 and the internal thread of the threaded hole section of the third hole section 123 start to mesh is the starting time point, and the period of time after the starting time point is the time period when the locking portion 113 of the tail cap 110 starts to lock with the third hole section 123 of the main nail 120 of the intramedullary nail.

[0084] In addition, the inner surface 1203 can limit the movement of the first guide portion 111 in the radial direction of the hole 1200 by abutting against the first guide portion 111, thereby guiding the first guide portion 111 so that the axis of the tail cap 110 and the axis of the hole 1200 are kept at a high degree of coincidence. Similarly, the inner surface 1203 can limit the movement of the second guide portion 112 in the radial direction of the hole 1200 by abutting against the second guide portion 112, thereby guiding the second guide portion 112 so that the axis of the tail cap 110 and the axis of the hole 1200 are kept at a high degree of coincidence.

[0085] The intramedullary nail assembly 100 provided in the embodiment of the present application can effectively improve the coincidence degree between the axis of the tail cap 110 and the axis of the third hole section 123 of the intramedullary nail main nail 120 by guiding the first guide portion 111 and the second guide portion 112 respectively through the inner surface 1203 of the intramedullary nail main nail 120 during the time period when the locking portion 113 of the tail cap 110 begins to lock with the third hole section 123 of the intramedullary nail main nail 120, so as to reduce the risk that the locking portion 113 of the tail cap 110 is pinned by the third hole section 123 of the intramedullary nail main nail 120 and cannot be further inserted.

[0086] In some embodiments, Figure 2 and Figure 3 As shown, the third hole section 123, the first hole section 121 and the second hole section 122 of the main intramedullary nail 120 are sequentially distributed along the direction X from the proximal end 1201 to the distal end 1202, and the locking portion 113, the first guide portion 111 and the second guide portion 112 of the tail cap 110 are sequentially distributed along the direction X from the head end 1101 to the tail end 1102. During the time period when the locking portion 113 begins to lock with the third hole section 123, at least a portion of the second guide portion 112 is inserted into the second hole section 122, and the second surface 1205 abuts against the second guide portion 112 to guide the second guide portion 112. At the same time, at least a portion of the first guide portion 111 is inserted into the first hole section 121, and the first surface 1204 abuts against the first guide portion 111 to guide the first guide portion 111.

[0087] The intramedullary nail assembly 100 provided in the embodiment of the present application can effectively improve the overlap between the axis of the tail cap 110 and the axis of the third hole section 123 of the intramedullary nail main nail 120 during the time period when the locking portion 113 of the tail cap 110 begins to lock with the third hole section 123 of the intramedullary nail main nail 120, thereby reducing the risk that the locking portion 113 of the tail cap 110 is pinned by the third hole section 123 of the intramedullary nail main nail 120 and cannot be further inserted.

[0088] like Figure 2As shown, the end of the first hole section 121 of the main intramedullary nail 120 close to the proximal end 1201 is the first end 1211, the end of the second hole section 122 close to the proximal end 1201 is the second end 1221, and the end of the third hole section 123 close to the proximal end 1201 is the third end 1231; the end of the first guide portion 111 close to the tail end 1102 is the fourth end 1112, the end of the second guide portion 112 close to the tail end 1102 is the fifth end 1121, and the end of the locking portion 113 close to the tail end 1102 is the sixth end 1131. The third hole section 123, the first hole section 121, and the second hole section 122 are sequentially distributed along the direction X from the proximal end 1201 to the distal end 1202, the distance between the third end 1231 and the second end 1221 is H1, and the distance between the first end 1211 and the third end 1231 is H2. A distance between the sixth end 1131 and the fifth end 1121 is L1, and a distance between the sixth end 1131 and the fourth end 1112 is L2.

[0089] In some embodiments, L1>H1 and L2>H2, so that during the period when the locking portion 113 begins to lock with the third hole segment 123, at least a portion of the second guide portion 112 is inserted into the second hole segment 122, and the second surface 1205 abuts against the second guide portion 112 to guide the second guide portion 112. At the same time, at least a portion of the first guide portion 111 is inserted into the first hole segment 121, and the first surface 1204 abuts against the first guide portion 111 to guide the first guide portion 111.

[0090] In other embodiments, Figure 4 and Figure 5 As shown, the first hole section 121, the second hole section 122 and the third hole section 123 of the main nail 120 of the intramedullary nail are sequentially distributed along the direction X from the proximal end 1201 to the distal end 1202, and the first guide portion 111, the second guide portion 112 and the locking portion 113 of the tail cap 110 are sequentially distributed along the direction X from the head end 1101 to the tail end 1102. During the time period when the locking portion 113 begins to lock with the third hole section 123, at least a portion of the second guide portion 112 is inserted into the second hole section 122, and the second surface 1205 abuts against the second guide portion 112 to guide the second guide portion 112. At the same time, at least a portion of the first guide portion 111 is inserted into the first hole section 121, and the first surface 1204 abuts against the first guide portion 111 to guide the first guide portion 111.

[0091] The intramedullary nail assembly 100 provided in the embodiment of the present application can effectively improve the overlap between the axis of the tail cap 110 and the axis of the third hole section 123 of the intramedullary nail main nail 120 during the time period when the locking portion 113 of the tail cap 110 begins to lock with the third hole section 123 of the intramedullary nail main nail 120, thereby reducing the risk that the locking portion 113 of the tail cap 110 is pinned by the third hole section 123 of the intramedullary nail main nail 120 and cannot be further inserted.

[0092] like Figure 4 As shown, the first hole section 121, the second hole section 122 and the third hole section 123 of the main nail 120 of the intramedullary nail are sequentially distributed along the direction X from the proximal end 1201 to the distal end 1202, the distance between the third end 1231 and the first end 1211 is H3, and the distance between the second end 1221 and the third end 1231 is H4. The first guide portion 111, the second guide portion 112 and the locking portion 113 of the tail cap 110 are sequentially distributed along the direction X from the head end 1101 to the tail end 1102, the distance between the fourth end 1112 and the sixth end 1131 is L3, and the distance between the fifth end 1121 and the sixth end 1131 is L4.

[0093] In some embodiments, L3<H3 and L4<H4, so that during the period when the locking portion 113 begins to lock with the third hole segment 123, at least a portion of the second guide portion 112 is inserted into the second hole segment 122, and the second surface 1205 abuts against the second guide portion 112 to guide the second guide portion 112. At the same time, at least a portion of the first guide portion 111 is inserted into the first hole segment 121, and the first surface 1204 abuts against the first guide portion 111 to guide the first guide portion 111.

[0094] In other embodiments, Figure 6 and Figure 7As shown, the third hole section 123, the first hole section 121 and the second hole section 122 of the main intramedullary nail 120 are sequentially distributed along the direction X from the proximal end 1201 to the distal end 1202, and the locking portion 113, the first guide portion 111 and the second guide portion 112 of the tail cap 110 are sequentially distributed along the direction X from the head end 1101 to the tail end 1102. During the time period when the locking portion 113 begins to lock with the third hole section 123, at least a portion of the second guide portion 112 is inserted into the second hole section 122, and the second surface 1205 abuts against the second guide portion 112 to guide the second guide portion 112. At the same time, at least a portion of the first guide portion 111 is inserted into the third hole section 123, and the third surface 1206 abuts against the first guide portion 111 to guide the first guide portion 111.

[0095] The intramedullary nail assembly 100 provided in the embodiment of the present application can effectively improve the overlap between the axis of the tail cap 110 and the axis of the third hole section 123 of the intramedullary nail main nail 120 during the time period when the locking portion 113 of the tail cap 110 begins to lock with the third hole section 123 of the intramedullary nail main nail 120, thereby reducing the risk that the locking portion 113 of the tail cap 110 is pinned by the third hole section 123 of the intramedullary nail main nail 120 and cannot be further inserted.

[0096] like Figure 6 and Figure 7 As shown, the distance between the third end 1231 and the second end 1221 is H1, and the distance between the sixth end 1131 and the fifth end 1121 is L1. In some embodiments, the locking portion 113 of the tail cap 110 is provided with an external thread, the third hole section 123 of the intramedullary nail main nail 120 is a threaded hole section engaged with the external thread, the minor diameter of the locking portion 113 is d3, L1>H1, and d3-d1≤0.5mm, so that during the time period when the locking portion 113 begins to lock with the third hole section 123, at least a portion of the second guide portion 112 is inserted into the second hole section 122, and the second surface 1205 abuts against the second guide portion 112 to guide the second guide portion 112. At the same time, at least a portion of the first guide portion 111 is inserted into the third hole section 123, and the third surface 1206 abuts against the first guide portion 111 to guide the first guide portion 111.

[0097] In some embodiments, the diameter of the inscribed circle of the radial cross-section of the first hole section 121 of the main nail of the intramedullary nail 120 is D1, wherein D1-d1≤0.8mm, so that the fitting clearance between the first hole section 121 of the main nail of the intramedullary nail 120 and the first guide portion 111 of the tail cap 110 is smaller. When the first guide portion 111 is at least partially inserted into the first hole section 121, the first surface 1204 abuts and limits the first guide portion 111, so that the radial movement distance of the first guide portion 111 in the first hole section 121 can be smaller, so that the axis of the first guide portion 111 of the tail cap 110 and the axis of the first hole section 121 have a higher degree of overlap, thereby improving the guiding effect of the first surface 1204 on the first guide portion 111 of the tail cap 110.

[0098] Furthermore, the inscribed circle diameter D1 of the radial cross section of the first hole segment 121 and the circumscribed circle diameter d1 of the radial cross section of the first guide portion 111 can satisfy: D1-d1≤0.5mm, thereby further limiting the radial movement distance of the first guide portion 111 in the first hole segment 121, so that the first surface 1204 has a better guiding effect on the first guide portion 111 of the tail cap 110.

[0099] In the embodiment of the present application, the value of D1-d1 can be 0.7mm, 0.6mm, 0.45mm, 0.3mm, 0.2mm, etc. In a preferred embodiment, D1-d1≤0.3mm, so that the first guide portion 111 can be inserted into the first hole section 121 more easily, and the first surface 1204 can achieve the best guiding effect on the first guide portion 111 of the tail cap 110.

[0100] Similarly, the diameter of the inscribed circle of the radial cross-section of the second hole section 122 of the intramedullary nail main nail 120 is D2, wherein D2-d2≤1.2mm, so that the fitting clearance between the second hole section 122 of the intramedullary nail main nail 120 and the second guide portion 112 of the tail cap 110 is smaller. When the second guide portion 112 is at least partially inserted into the second hole section 122, the abutment and limiting of the second guide portion 112 by the second surface 1205 can make the radial movement distance of the second guide portion 112 of the second hole section 122 smaller, so that the axis of the second guide portion 112 of the tail cap 110 and the axis of the second hole section 122 have a higher degree of overlap, thereby improving the guiding effect of the second surface 1205 on the second guide portion 112 of the tail cap 110.

[0101] Furthermore, the inscribed circle diameter of the radial cross section of the second hole segment 122 can be set to D2, and the circumscribed circle diameter d2 of the radial cross section of the second guide portion 112 can satisfy: D2-d2≤0.8mm, thereby further limiting the radial movement distance of the second guide portion 112 in the second hole segment 122, so that the second surface 1205 has a better guiding effect on the second guide portion 112 of the tail cap 110.

[0102] In the embodiment of the present application, the value of D2-d2 can be 1.1 mm, 1 mm, 0.9 mm, 0.6 mm, etc. In a preferred embodiment, D2-d2 can be ≤ 0.3 mm, so that the second guide portion 112 can be inserted into the second hole section 122 more easily, and the second surface 1205 can achieve the best guiding effect on the second guide portion 112 of the tail cap 110.

[0103] It should be noted that D1-d1 and D2-d2 can meet the above requirements at the same time, or only one of D1-d1 and D2-d2 can meet the above requirements. Of course, the former can further improve the coincidence degree between the axis of the tail cap 110 and the axis of the third hole section 123 of the intramedullary nail main nail 120.

[0104] In some embodiments, the diameter of the inscribed circle of the radial section of the first hole section 121 of the main nail of the intramedullary nail 120 is D1, and the diameter of the inscribed circle of the radial section of the second hole section 122 of the main nail of the intramedullary nail 120 is D2; wherein, D1-d1≤D2-d2. By making the value of D1-d1 less than or equal to the value of D2-d2, the second guide portion 112 of the tail cap 110 can be initially guided by the second surface 1205 of the main nail of the intramedullary nail 120 before the locking portion 113 of the tail cap 110 starts to lock with the third hole section 123 of the main nail of the intramedullary nail 120, so that the first guide portion 111 of the tail cap 110 can be more accurately inserted into the first hole section 121, and the first guide portion 111 of the tail cap 110 can be guided by the first surface 1204 of the main nail of the intramedullary nail 120, so as to further improve the coincidence degree between the axis of the tail cap 110 and the axis of the third hole section 123 of the main nail of the intramedullary nail 120. Therefore, during the time period when the locking portion 113 of the tail cap 110 begins to lock with the third hole segment 123 of the main intramedullary nail 120, the axis of the locking portion 113 of the tail cap 110 and the axis of the third hole segment 123 of the main intramedullary nail 120 have a high degree of coincidence, and the locking portion 113 of the tail cap 110 is not easily stuck or jammed by the third hole segment 123.

[0105] In some embodiments, (D2-d2)-(D1-d1)≤0.4mm. Thus, it is avoided that the matching clearance between the first guide portion 111 and the second guide portion 112 of the tail cap 110 and the first hole section 121 and the second hole section 122 of the intramedullary nail main nail 120 is too different, resulting in only one surface of the first surface 1204 and the second surface 1205 playing a guiding role.

[0106] In some embodiments, the third hole section 123 is the first locking hole of the intramedullary nail main nail 120 along the direction X from the proximal end 1201 to the distal end 1202. It is understandable that a plurality of locking holes may be provided in the hole 1200 of the intramedullary nail main nail 120, one of which may be used to lock with the locking portion 113 of the tail cap 110, and the other locking holes may be used to lock with other components other than the tail cap 110. By making the third hole section 123 the first locking hole of the intramedullary nail main nail 120 along the direction X from the proximal end 1201 to the distal end 1202, the problem that the locking portion 113 of the tail cap 110 is stuck or stuck by other locking holes of the intramedullary nail main nail 120 during the process of inserting the locking portion 113 of the tail cap 110 into the third hole section 123 of the intramedullary nail main nail 120 can be avoided, so that the locking portion 113 of the tail cap 110 can be locked with the third hole section 123 more smoothly.

[0107] like Figure 8 As shown, the intramedullary nail main nail 120 includes a relative proximal end 1201 and a distal end 1202, and the intramedullary nail main nail 120 includes an inner surface 1203 extending between the proximal end 1201 and the distal end 1202, and the inner surface 1203 includes a fourth surface 1207, a fifth surface 1208 and a sixth surface 1209, the fourth surface 1207 encloses a fourth hole segment 124, the fifth surface 1208 encloses a fifth hole segment 125, and the sixth surface 1209 encloses a sixth hole segment 126, and the fourth hole segment 124 and the fifth hole segment 125 are distributed in sequence along the direction X from the proximal end 1201 to the distal end 1202.

[0108] The tail cap 110 includes a head end 1101 and a tail end 1102 opposite to each other. The tail cap 110 includes a first guide portion 111, a second guide portion 112 and a locking portion 113. The first guide portion 111 and the second guide portion 112 are sequentially distributed along the direction X from the head end 1101 to the tail end 1102. The diameter of the circumscribed circle of the radial cross section of the first guide portion 111 is d1, and the diameter of the circumscribed circle of the radial cross section of the second guide portion 112 is d2, and d1>d2. The first guide portion 111 is used to insert into the fourth hole segment 124, the second guide portion 112 is used to insert into the fifth hole segment 125, and the locking portion 113 is used to insert into the sixth hole segment 126 and lock with the sixth hole segment 126.

[0109] In some embodiments, the sixth hole segment 126 is the first locking hole of the intramedullary nail main nail 120 along the direction X from the proximal end 1201 to the distal end 1202. It is understandable that a plurality of locking holes may be provided in the hole 1200 of the intramedullary nail main nail 120, one of which may be used to lock with the locking portion 113 of the tail cap 110, and the other locking holes may be used to lock with other components other than the tail cap 110. By making the sixth hole segment 126 the first locking hole of the intramedullary nail main nail 120 along the direction X from the proximal end 1201 to the distal end 1202, the problem that the locking portion 113 of the tail cap 110 is stuck or stuck in other locking holes of the intramedullary nail main nail 120 during the process of inserting the locking portion 113 of the tail cap 110 into the sixth hole segment 126 of the intramedullary nail main nail 120 can be avoided, so that the locking portion 113 of the tail cap 110 can be locked with the sixth hole segment 126 more smoothly.

[0110] In some embodiments, Fig. 9 As shown, during the period when the locking portion 113 begins to lock with the sixth hole segment 126, at least a portion of the first guide portion 111 is inserted into the fourth hole segment 124, and the fourth surface 1207 is used to abut against the first guide portion 111 to guide the first guide portion 111. At least a portion of the second guide portion 112 is inserted into the fifth hole segment 125, and the fifth surface 1208 is used to abut against the second guide portion 112 to guide the second guide portion 112.

[0111] The locking of the locking portion 113 of the tail cap 110 and the sixth hole section 126 of the main nail 120 of the intramedullary nail is a continuous process, and the time point when the locking portion 113 of the tail cap 110 starts to cooperate with the locking structure in the sixth hole section 126 of the main nail 120 of the intramedullary nail is the starting time point, and the period of time after the starting time point is the time period when the locking portion 113 of the tail cap 110 starts to lock with the sixth hole section 126 of the main nail 120 of the intramedullary nail. For example, if the locking portion 113 is a threaded section and the sixth hole section 126 is a threaded hole section, the time point when the external thread of the threaded section of the locking portion 113 and the internal thread of the threaded hole section of the sixth hole section 126 start to mesh is the starting time point, and the period of time after the starting time point is the time period when the locking portion 113 of the tail cap 110 starts to lock with the sixth hole section 126 of the main nail 120 of the intramedullary nail.

[0112] When at least part of the first guide portion 111 is inserted into the fourth hole segment 124, the fourth surface 1207 can limit the radial movement of the first guide portion 111 in the fourth hole segment 124 by abutting against the first guide portion 111, thereby guiding the first guide portion 111 and making the axis of the tail cap 120 and the axis of the fourth hole segment 124 maintain a high degree of coincidence.

[0113] When at least part of the second guide portion 112 is inserted into the fifth hole segment 125, the fifth surface 1208 can limit the radial movement of the second guide portion 112 in the fifth hole segment 125 by abutting against the second guide portion 112, thereby guiding the second guide portion 112 and making the axis of the tail cap 120 and the axis of the fifth hole segment 125 maintain a high degree of coincidence.

[0114] The intramedullary nail assembly 100 provided in the embodiment of the present application can effectively improve the overlap between the axis of the tail cap 110 and the axis of the sixth hole segment 126 of the intramedullary nail main nail 120 during the time period when the locking portion 113 of the tail cap 110 begins to lock with the sixth hole segment 126 of the intramedullary nail main nail 120, thereby reducing the risk that the locking portion 113 of the tail cap 110 is pinned by the sixth hole segment 126 of the intramedullary nail main nail 120 and cannot be further inserted.

[0115] In other embodiments, Fig.11 and Fig.12 As shown, during the period when the locking portion 113 begins to lock with the sixth hole segment 126, at least a portion of the first guide portion 111 is inserted into the fourth hole segment 124, and the fourth surface 1207 is used to abut against the first guide portion 111 to guide the first guide portion 111. At least a portion of the second guide portion 112 is inserted into the sixth hole segment 126, and the sixth surface 1209 is used to abut against the second guide portion 112 to guide the second guide portion 112.

[0116] The intramedullary nail assembly 100 provided in the embodiment of the present application can effectively improve the overlap between the axis of the tail cap 110 and the axis of the sixth hole segment 126 of the intramedullary nail main nail 120 during the time period when the locking portion 113 of the tail cap 110 begins to lock with the sixth hole segment 126 of the intramedullary nail main nail 120, thereby reducing the risk that the locking portion 113 of the tail cap 110 is pinned by the sixth hole segment 126 of the intramedullary nail main nail 120 and cannot be further inserted.

[0117] In some embodiments, Figure 8 and Fig. 9As shown, the fourth hole section 124, the sixth hole section 126 and the fifth hole section 125 of the intramedullary nail main nail 120 are sequentially distributed along the direction X from the proximal end 1201 to the distal end 1202. The first guide portion 111, the locking portion 113 and the second guide portion 112 of the tail cap 110 are sequentially distributed along the direction X from the head end 1101 to the tail end 1102.

[0118] The end of the fourth hole section 124 of the main intramedullary nail 120 close to the proximal end 1201 is the seventh end 1241, the end of the fifth hole section 125 close to the proximal end 1201 is the eighth end 1251, and the end of the sixth hole section 126 close to the proximal end 1201 is the ninth end 1261. The distance between the seventh end 1241 and the ninth end 1261 of the main intramedullary nail 120 is H5, and the distance between the ninth end 1261 and the eighth end 1251 is H6. The end of the first guide portion 111 of the tail cap 110 close to the tail end 1102 is the fourth end 1112, the end of the second guide portion 112 close to the tail end 1102 is the fifth end 1121, and the end of the locking portion 113 close to the tail end 1102 is the sixth end 1131. A distance between the fourth end 1112 and the sixth end 1131 of the tail cap 110 is L5, and a distance between the sixth end 1131 and the fifth end 1121 is L6.

[0119] In some embodiments, L5<H5 and L6>H6, so that during the time period when the locking portion 113 of the tail cap 110 begins to lock with the sixth hole segment 126 of the intramedullary nail main nail 120, the first guide portion 111 of the tail cap 110 is guided by the fourth surface 1207 of the intramedullary nail main nail 120, and the second guide portion 112 of the tail cap 110 is guided by the fifth surface 1208 of the intramedullary nail main nail 120.

[0120] In other embodiments, the locking portion 113 of the tail cap 110 is provided with an external thread, the sixth hole segment 126 of the intramedullary nail main nail 120 is a threaded hole segment engaged with the external thread, and the minor diameter of the locking portion 113 is d3, wherein L5<H5 and d3-d2≤0.5mm, so that during the time period when the locking portion 113 of the tail cap 110 begins to lock with the sixth hole segment 126 of the intramedullary nail main nail 120, the first guide portion 111 of the tail cap 110 is guided by the fourth surface 1207 of the intramedullary nail main nail 120, and the second guide portion 112 of the tail cap 110 is guided by the sixth surface 1209 of the intramedullary nail main nail 120.

[0121] like Figure 8As shown, the diameter of the inscribed circle of the radial section of the fourth hole section 124 of the intramedullary nail main nail 120 is D3, D3-d1≤0.8mm, so that the fitting clearance between the fourth hole section 124 of the intramedullary nail main nail 120 and the first guide portion 111 of the tail cap 110 is smaller. When the first guide portion 111 is at least partially inserted into the fourth hole section 124, the abutment and limitation of the first guide portion 111 by the fourth surface 1207 can make the radial movement distance of the first guide portion 111 in the fourth hole section 124 smaller, so that the axis of the tail cap 110 and the axis of the fourth hole section 124 have a higher degree of overlap, thereby improving the guiding effect of the fourth surface 1207 on the first guide portion 111 of the tail cap 110.

[0122] Among them, the inscribed circle diameter D3 of the radial cross section of the fourth hole segment 124 and the circumscribed circle diameter d1 of the radial cross section of the first guide portion 111 can satisfy: D3-d1≤0.5mm, thereby further limiting the radial movement distance of the first guide portion 111 in the fourth hole segment 124, so that the fourth surface 1207 of the intramedullary nail main nail 120 has a better guiding effect on the first guide portion 111 of the tail cap 110.

[0123] In the embodiment of the present application, the value of D3-d1 can be 0.7mm, 0.6mm, 0.45mm, 0.3mm, 0.2mm, etc. In a preferred embodiment, D3-d1 can be ≤ 0.3mm, so that the first guide portion 111 can be inserted into the fourth hole section 124 more easily, and the fourth surface 1207 can achieve the best guiding effect on the first guide portion 111 of the tail cap 110.

[0124] Similarly, the inscribed circle diameter D4 of the radial cross-section of the fifth hole segment 125 of the intramedullary nail main nail 120, wherein D4-d2≤1.2mm, is used to make the fitting clearance between the fifth hole segment 125 of the intramedullary nail main nail 120 and the second guide portion 112 of the tail cap 110 smaller. When the second guide portion 112 is at least partially inserted into the fifth hole segment 125, the abutment and limiting of the second guide portion 112 by the fifth surface 1208 can make the radial movement distance of the second guide portion 112 in the fifth hole segment 125 smaller, so that the axis of the second guide portion 112 of the tail cap 110 and the axis of the fifth hole segment 125 have a higher degree of overlap, thereby improving the guiding effect of the fifth surface 1208 on the second guide portion 112 of the tail cap 110.

[0125] Among them, the inscribed circle diameter D4 of the radial cross-section of the fifth hole segment 125 and the circumscribed circle diameter d2 of the radial cross-section of the second guide portion 112 can satisfy: D4-d2≤0.8mm, so as to further limit the radial movement distance of the second guide portion 112 in the fifth hole segment 125, so that the fifth surface 1208 of the intramedullary nail main nail 120 has a better guiding effect on the second guide portion 112 of the tail cap 110.

[0126] In the embodiment of the present application, the value of D4-d2 can be 1.1 mm, 1 mm, 0.9 mm, 0.6 mm, etc. In a preferred embodiment, D4-d2 can be ≤ 0.5 mm, so that the second guide portion 112 can be inserted into the fifth hole section 125 more easily, and the fifth surface 1208 can achieve the best guiding effect on the second guide portion 112 of the tail cap 110.

[0127] In some embodiments, the inscribed circle diameter D3 of the radial section of the fourth hole section 124 of the intramedullary nail main nail 120 and the inscribed circle diameter D4 of the radial section of the fifth hole section 125 of the intramedullary nail main nail 120; wherein D3-d1≤D4-d2. By making the value of D3-d1 less than or equal to the value of D4-d2, the second guide portion 112 of the tail cap 110 can be initially guided by the fifth surface 1208 of the intramedullary nail main nail 120 before the locking portion 113 of the tail cap 110 starts to lock with the sixth hole section 126 of the intramedullary nail main nail 120, so that the first guide portion 111 of the tail cap 110 can be more accurately inserted into the fourth hole section 124, and the first guide portion 111 of the tail cap 110 can be guided by the fourth surface 1207 of the intramedullary nail main nail 120, so as to further improve the coincidence degree between the axis of the tail cap 110 and the axis of the sixth hole section 126 of the intramedullary nail main nail 120. Therefore, during the time period when the locking portion 113 of the tail cap 110 begins to lock with the sixth hole segment 126 of the intramedullary nail main nail 120, the axis of the locking portion 113 of the tail cap 110 and the axis of the sixth hole segment 126 of the intramedullary nail main nail 120 have a high degree of overlap, and the locking portion 113 of the tail cap 110 is not easily stuck or jammed by the sixth hole segment 126.

[0128] In some embodiments, (D4-d2)-(D3-d1)≤0.4mm. Thus, it is avoided that the matching clearance between the first guide portion 111 and the second guide portion 112 of the tail cap 110 and the fourth hole section 124 and the fifth hole section 125 of the intramedullary nail main nail 120 is too different, resulting in only one of the fourth surface 1207 and the fifth surface 1208 playing a guiding role.

[0129] like Figure 8 As shown, the distance H5 between the seventh end 1241 and the ninth end 1261, and the distance L8 between the fourth end 1112 and the fifth end 1121 satisfy: L8 ≥ H5. Therefore, the tail cap 110 is a short tail cap structure. The sixth hole section 126 of the intramedullary nail main nail 120 is a threaded hole section, and the minor diameter of the sixth hole section 126 is D5. The diameter of the inscribed circle of the radial cross section of the fourth hole section 124 is D3. Among them, H5>L5*cosα, α=arcsin{(D5+D3-d2-d1) / (2*L8)}.

[0130] It is understandable that, during the process of inserting the tail cap 110 into the hole 1200 of the main nail 120 of the intramedullary nail, the axis of the tail cap 110 is inclined at a certain angle relative to the axis of the hole 1200 of the main nail 120 of the intramedullary nail, and the maximum angle is α=arcsin{(D5+D3-d2-d1) / (2*L8)}. By making H5>L5*cosα, it can be further ensured that during the time period when the locking portion 113 of the tail cap 110 begins to insert into the sixth hole section 126 of the main nail 120 of the intramedullary nail, the first guide portion 111 of the tail cap 110 has been inserted into the fourth hole section 124 of the main nail 120 of the intramedullary nail, thereby avoiding the situation where the first guide portion 111 of the tail cap 110 is not inserted into the fourth hole section 124 of the main nail 120 of the intramedullary nail due to the inclination of the axis of the tail cap 110 relative to the axis of the hole 1200 of the main nail 120 of the intramedullary nail.

[0131] like Figure 8 As shown, a chamfer 1222 is provided at one end of the fourth hole section 124 of the main nail 120 of the intramedullary nail near the proximal end 1201, and the chamfer 1222 can guide the tail cap 110 so that the tail cap 110 can be inserted into the hole 1200 of the main nail 120 of the intramedullary nail more smoothly. The length of the chamfer 1222 along the direction X from the proximal end 1201 to the distal end 1202 is C1, and H5-C1>L5*cosα. Thus, it can be avoided that during the time period when the locking portion 113 of the tail cap 110 begins to be inserted into the sixth hole section 126 of the main nail 120 of the intramedullary nail, the first guide portion 111 of the tail cap 110 is still at the chamfer 1222 of the main nail 120 of the intramedullary nail, and is not inserted into the fourth hole section 124 of the main nail 120 of the intramedullary nail.

[0132] like Figure 8 As shown, the locking portion 113 of the tail cap 110 is a threaded segment, and the tail cap 110 also includes a back-cut groove 114 located between the locking portion 113 and the first guide portion 111, so as to facilitate the processing and forming of the threaded segment on the locking portion 113. The length of the back-cut groove 114 in the direction X from the head end 1101 to the tail end 1102 is L7, and the pitch of the locking portion 113 is P, L7≤P. Therefore, while conveniently processing and forming the threaded segment of the tail cap 110, the size of the back-cut groove 114 in the length direction of the tail cap 110 can be shortened as much as possible, so that the length of the locking portion 113 is as long as possible, thereby increasing the number of thread rings on the locking portion 113, and improving the locking effect of the locking portion 113 of the tail cap 110 and the corresponding hole segment of the main nail 120 of the intramedullary nail.

[0133] like Figure 8 and Fig.10As shown, the tail cap 110 includes a first side surface 1141, which is located on a side of the undercut groove 114 close to the tail end 1102, and the first side surface 1141 includes a first edge 1143 close to the bottom of the undercut groove 114, and a second edge 1144 opposite to the first edge 1143, and the second edge 1144 is farther away from the head end 1101 than the first edge 1143. Specifically, the first side surface 1141 is a conical surface, and the contour line of the cross section of the first side surface 1141 in the direction X perpendicular to the head end 1101 to the tail end 1102 of the tail cap 110 is circular, and the diameter of the contour line gradually increases in the direction X from the head end 1101 to the tail end 1102 of the tail cap 110.

[0134] The major diameter of the locking portion 113 is d4. The minor diameter of the locking portion 113 is d3. The thread angle of the thread teeth of the locking portion 113 is β. In some embodiments, L7≥0.25*P+(d4 / 2-d3 / 2)*tan(β / 2). Thus, while ensuring the normal withdrawal of the tool during the processing of the threaded segment by the withdrawal groove 114, the length of the withdrawal groove 114 can be made as short as possible, so that the length of the locking portion 113 can be made as long as possible, so as to further improve the locking effect of the locking portion 113 of the tail cap 110 and the corresponding hole segment of the intramedullary nail main nail 120.

[0135] like Fig.13 and Fig.14 As shown, the tail cap 110 includes a first side surface 1141 and a second side surface 1142, and the first side surface 1141 and the second side surface 1142 are sequentially distributed on both sides of the undercut groove 114 along the direction X from the head end 1101 to the tail end 1102, and the second side surface 1142 includes a third edge 1145 close to the bottom of the undercut groove 114, and a fourth edge 1146 opposite to the third edge 1145, and the fourth edge 1146 is closer to the head end 1101 than the third edge 1145. Specifically, the second side surface 1142 is a conical surface, and the contour line of the cross section of the second side surface 1142 perpendicular to the direction X from the head end 1101 to the tail end 1102 of the tail cap 110 is circular, and the diameter of the contour line gradually decreases in the direction X from the head end 1101 to the tail end 1102 of the tail cap 110.

[0136] The minor diameter of the locking portion 113 is d3, and the thread angle of the thread teeth of the locking portion 113 is β. In some embodiments, L7≥0.25*P+(d1 / 2-d3 / 2)*tan(β / 2), so that the length of the backing groove 114 can be as short as possible while ensuring the normal backing of the tool when processing the threaded segment through the backing groove 114, so that the length of the locking portion 113 can be as long as possible, so as to further improve the locking effect of the locking portion 113 of the tail cap 110 and the corresponding hole segment of the intramedullary nail main nail 120.

[0137] The application embodiment itself also provides a tail cap, which is used to connect with the intramedullary nail main nail 120. The intramedullary nail main nail 120 includes a relative proximal end 1201 and a distal end 1202. The intramedullary nail main nail 120 includes an inner surface 1203 extending between the proximal end 1201 and the distal end 1202. The inner surface 1203 includes a first surface 1204, a second surface 1205 and a third surface 1206. The first surface 1204 encloses a first hole segment 121, the second surface 1205 encloses a second hole segment 122, and the third surface 1206 encloses a third hole segment 123.

[0138] like Figures 2 to 7 As shown, the tail cap 110 includes a relative head end 1101 and a tail end 1102, and the tail cap 110 includes a first guide portion 111, a second guide portion 112 and a locking portion 113. The circumscribed circle diameter of the radial cross section of the first guide portion 111 is d1, and the circumscribed circle diameter of the radial cross section of the second guide portion 112 is d2, d1>d2.

[0139] The first guide portion 111 is used to insert into the first hole segment 121, the second guide portion 112 is used to insert into the second hole segment 122, and the locking portion 113 is used to insert into the third hole segment 123 and lock with the third hole segment 123; wherein the third hole segment 123, the first hole segment 121, and the second hole segment 122 are sequentially distributed along the direction X from the proximal end 1201 to the distal end 1202, and the locking portion 113, the first guide portion 111, and the second guide portion 112 are sequentially distributed along the direction X from the head end 1101 to the tail end 1102; or, the first hole segment 121, the second hole segment 122, and the third hole segment 123 are sequentially distributed along the direction X from the proximal end 1201 to the distal end 1202, and the first guide portion 111, the second guide portion 112, and the locking portion 113 are sequentially distributed along the direction X from the head end 1101 to the tail end 1102.

[0140] During the time period when the locking portion 113 begins to lock with the third hole segment 123, at least a portion of the second guide portion 112 is inserted into the second hole segment 122, and the second surface 1205 abuts against the second guide portion 112 to guide the second guide portion 112, at least a portion of the first guide portion 111 is inserted into the first hole segment 121, and the first surface 1204 abuts against the first guide portion 111 to guide the first guide portion 111, or, at least a portion of the first guide portion 111 is inserted into the third hole segment 123, and the third surface 1206 abuts against the first guide portion 111 to guide the first guide portion 111.

[0141] The embodiment of the present application also provides a tail cap, which is used to connect with the intramedullary nail main nail 120. The intramedullary nail main nail 120 includes a relative proximal end 1201 and a distal end 1202. The intramedullary nail main nail 120 includes an inner surface 1203 extending between the proximal end 1201 and the distal end 1202. The inner surface 1203 includes a fourth surface 1207, a fifth surface 1208 and a sixth surface 1209. The fourth surface 1207 encloses a fourth hole segment 124, the fifth surface 1208 encloses a fifth hole segment 125, and the sixth surface 1209 encloses a sixth hole segment 126. The fourth hole segment 124 and the fifth hole segment 125 are distributed in sequence along the direction X from the proximal end 1201 to the distal end 1202. The sixth hole segment 126 is the first locking hole of the intramedullary nail main nail 120 along the direction X from the proximal end 1201 to the distal end 1202.

[0142] like Figures 8 to 14 As shown, the tail cap 110 includes a head end 1101 and a tail end 1102 opposite to each other, and the tail cap 110 includes a first guide portion 111, a second guide portion 112 and a locking portion 113. The first guide portion 111 and the second guide portion 112 are sequentially distributed along the direction X from the head end 1101 to the tail end 1102, the circumscribed circle diameter of the radial cross section of the first guide portion 111 is d1, the circumscribed circle diameter of the radial cross section of the second guide portion 112 is d2, d1>d2; the first guide portion 111 is used to insert into the fourth hole segment 124, the second guide portion 112 is used to insert into the fifth hole segment 125, and the locking portion 113 is used to insert into the sixth hole segment 126 and lock with the sixth hole segment 126.

[0143] In which, during the time period when the locking portion 113 begins to lock with the sixth hole segment 126, at least a portion of the first guide portion 111 is inserted into the fourth hole segment 124, and the fourth surface 1207 is used to abut against the first guide portion 111 to guide the first guide portion 111, and at least a portion of the second guide portion 112 is inserted into the fifth hole segment 125, and the fifth surface 1208 is used to abut against the second guide portion 112 to guide the second guide portion 112; or, at least a portion of the second guide portion 112 is inserted into the sixth hole segment 126, and the sixth surface 1209 is used to abut against the second guide portion 112 to guide the second guide portion 112.

[0144] The embodiment of the present application also provides an intramedullary nail main nail 120, which is used to connect with a tail cap 110, and the tail cap 110 includes a head end 1101 and a tail end 1102 relative to each other. The tail cap 110 includes a first guide portion 111, a second guide portion 112 and a locking portion 113. The diameter of the circumscribed circle of the radial cross section of the first guide portion 111 is d1, and the diameter of the circumscribed circle of the radial cross section of the second guide portion 112 is d2, and d1>d2.

[0145] The intramedullary nail main nail 120 includes a relative proximal end 1201 and a distal end 1202, and the intramedullary nail main nail 120 includes an inner surface 1203 extending between the proximal end 1201 and the distal end 1202, and the inner surface 1203 includes a first surface 1204, a second surface 1205 and a third surface 1206. The first surface 1204 encloses a first hole section 121, the second surface 1205 encloses a second hole section 122, and the third surface 1206 encloses a third hole section 123. The first hole section 121 is used for inserting the first guide portion 111, the second hole section 122 is used for inserting the second guide portion 112, and the third hole section 123 is used for inserting the locking portion 113 and locking with the locking portion 113.

[0146] During the time period when the locking portion 113 begins to lock with the third hole segment 123, at least a portion of the second guide portion 112 is inserted into the second hole segment 122, and the second surface 1205 abuts against the second guide portion 112 to guide the second guide portion 112, at least a portion of the first guide portion 111 is inserted into the first hole segment 121, and the first surface 1204 abuts against the first guide portion 111 to guide the first guide portion 111, or, at least a portion of the first guide portion 111 is inserted into the third hole segment 123, and the third surface 1206 abuts against the first guide portion 111 to guide the first guide portion 111.

[0147] The third hole segment 123, the first hole segment 121 and the second hole segment 122 are sequentially distributed along the direction X from the proximal end 1201 to the distal end 1202, and the locking portion 113, the first guide portion 111 and the second guide portion 112 are sequentially distributed along the direction X from the head end 1101 to the tail end 1102; or,

[0148] The first hole segment 121, the second hole segment 122 and the third hole segment 123 are sequentially distributed along the direction X from the proximal end 1201 to the distal end 1202, and the first guide portion 111, the second guide portion 112 and the locking portion 113 are sequentially distributed along the direction X from the head end 1101 to the tail end 1102; or,

[0149] Among them, the third hole segment 123 is the first locking hole 1200 of the intramedullary nail main nail 120 along the direction X from the proximal end 1201 to the distal end 1202, and the first hole segment 121, the third hole segment 123 and the second hole segment 122 are distributed in sequence along the direction X from the proximal end 1201 to the distal end 1202, and the first guide portion 111, the locking portion 113 and the second guide portion 112 are distributed in sequence along the direction X from the head end 1101 to the tail end 1102.

[0150] The present application also provides an intramedullary nail assembly 100. Fig.15As shown, the intramedullary nail assembly 100 includes an intramedullary nail main nail 120 and a tail cap 110, the intramedullary nail main nail 120 includes a relative proximal end 1201 and a distal end 1202, the intramedullary nail main nail 120 includes an inner surface 1203 extending between the proximal end 1201 and the distal end 1202, the inner surface 1203 includes a second surface 1205 and a third surface 1206, the second surface 1205 encloses a second hole segment 122, the third surface 1206 encloses a third hole segment 123, the third hole segment 123 and the second hole segment 122 are distributed sequentially along the direction X from the proximal end 1201 to the distal end 1202.

[0151] The tail cap 110 includes a head end 1101 and a tail end 1102 opposite to each other, and the tail cap 110 includes a first guide portion 111, a second guide portion 112 and a locking portion 113. The locking portion 113, the first guide portion 111 and the second guide portion 112 are sequentially distributed along the direction X from the head end 1101 to the tail end 1102. The first guide portion 111 is used to insert the third hole segment 123, the second guide portion 112 is used to insert the second hole segment 122, and the locking portion 113 is used to insert the third hole segment 123 and lock with the third hole segment 123; the circumscribed circle diameter of the radial cross section of the first guide portion 111 is d1, and the circumscribed circle diameter of the radial cross section of the second guide portion 112 is d2, d1>d2; the length of the locking portion 113 in the direction X from the head end 1101 to the tail end 1102 is less than the length of the third hole segment 123 in the direction X from the proximal end 1201 to the distal end 1202.

[0152] In which, during the time period when the locking portion 113 begins to lock with the third hole segment 123, at least a portion of the first guide portion 111 is inserted into the third hole segment 123, and the third surface 1206 abuts against the first guide portion 111 to guide the first guide portion 111, and at least a portion of the second guide portion 112 is inserted into the second hole segment 122, and the second surface 1205 abuts against the second guide portion 112 to guide the second guide portion 112.

[0153] An embodiment of the present application also provides an implant assembly, including an implant and a locking member, the implant including a relative proximal end 1201 and a distal end 1202, the implant including an inner surface 1203 extending between the proximal end 1201 and the distal end 1202, the inner surface 1203 including a first surface 1204, a second surface 1205 and a third surface 1206, the first surface 1204 encloses a first hole segment 121, the second surface 1205 encloses a second hole segment 122, and the third surface 1206 encloses a third hole segment 123.

[0154] The locking member includes a relative head end 1101 and a tail end 1102, and the locking member includes a first guide portion 111, a second guide portion 112 and a locking portion 113. The circumscribed circle diameter of the radial cross section of the first guide portion 111 is d1, and the circumscribed circle diameter of the radial cross section of the second guide portion 112 is d2, d1>d2; the first guide portion 111 is used to insert into the first hole section 121, the second guide portion 112 is used to insert into the second hole section 122, and the locking portion 113 is used to insert into the third hole section 123 and lock with the third hole section 123.

[0155] During the time period when the locking portion 113 begins to lock with the third hole segment 123, at least a portion of the second guide portion 112 is inserted into the second hole segment 122, and the second surface 1205 abuts against the second guide portion 112 to guide the second guide portion 112, at least a portion of the first guide portion 111 is inserted into the first hole segment 121, and the first surface 1204 abuts against the first guide portion 111 to guide the first guide portion 111, or, at least a portion of the first guide portion 111 is inserted into the third hole segment 123, and the third surface 1206 abuts against the first guide portion 111 to guide the first guide portion 111.

[0156] The locking portion 113, the first guide portion 111 and the second guide portion 112 are sequentially distributed along the direction X from the head end 1101 to the tail end 1102, and the third hole segment 123, the first hole segment 121 and the second hole segment 122 are sequentially distributed along the direction X from the proximal end 1201 to the distal end 1202; or,

[0157] The first guide portion 111, the second guide portion 112 and the locking portion 113 are sequentially distributed along the direction X from the head end 1101 to the tail end 1102, and the first hole segment 121, the second hole segment 122 and the third hole segment 123 are sequentially distributed along the direction X from the proximal end 1201 to the distal end 1202; or,

[0158] Among them, the third hole segment 123 is the first locking hole of the implant along the direction X from the proximal end 1201 to the distal end 1202, and the first guide portion 111, the locking portion 113 and the second guide portion 112 are distributed sequentially along the direction X from the head end 1101 to the tail end 1102, and the first hole segment 121, the third hole segment 123 and the second hole segment 122 are distributed sequentially along the direction X from the proximal end 1201 to the distal end 1202.

[0159] An embodiment of the present application also provides a locking member, which is used to connect to an implant, wherein the implant includes a relative proximal end 1201 and a distal end 1202, and the implant includes an inner surface 1203 extending between the proximal end 1201 and the distal end 1202, and the inner surface 1203 includes a first surface 1204, a second surface 1205 and a third surface 1206, the first surface 1204 encloses a first hole segment 121, the second surface 1205 encloses a second hole segment 122, and the third surface 1206 encloses a third hole segment 123.

[0160] The locking member includes a relative head end 1101 and a tail end 1102, and the locking member includes a first guide portion 111, a second guide portion 112 and a locking portion 113. The circumscribed circle diameter of the radial cross section of the first guide portion 111 is d1, and the circumscribed circle diameter of the radial cross section of the second guide portion 112 is d2, d1>d2; the first guide portion 111 is used to insert into the first hole section 121, the second guide portion 112 is used to insert into the second hole section 122, and the locking portion 113 is used to insert into the third hole section 123 and lock with the third hole section 123.

[0161] During the time period when the locking portion 113 begins to lock with the third hole segment 123, at least a portion of the second guide portion 112 is inserted into the second hole segment 122, and the second surface 1205 abuts against the second guide portion 112 to guide the second guide portion 112, at least a portion of the first guide portion 111 is inserted into the first hole segment 121, and the first surface 1204 abuts against the first guide portion 111 to guide the first guide portion 111, or, at least a portion of the first guide portion 111 is inserted into the third hole segment 123, and the third surface 1206 abuts against the first guide portion 111 to guide the first guide portion 111.

[0162] The locking portion 113, the first guide portion 111 and the second guide portion 112 are sequentially distributed along the direction X from the head end 1101 to the tail end 1102, and the third hole segment 123, the first hole segment 121 and the second hole segment 122 are sequentially distributed along the direction X from the proximal end 1201 to the distal end 1202; or,

[0163] The first guide portion 111, the second guide portion 112 and the locking portion 113 are sequentially distributed along the direction X from the head end 1101 to the tail end 1102, and the first hole segment 121, the second hole segment 122 and the third hole segment 123 are sequentially distributed along the direction X from the proximal end 1201 to the distal end 1202; or,

[0164] Among them, the third hole segment 123 is the first locking hole of the implant along the direction X from the proximal end 1201 to the distal end 1202, and the first guide portion 111, the locking portion 113 and the second guide portion 112 are distributed sequentially along the direction X from the head end 1101 to the tail end 1102, and the first hole segment 121, the third hole segment 123 and the second hole segment 122 are distributed sequentially along the direction X from the proximal end 1201 to the distal end 1202.

[0165] An embodiment of the present application also provides an implant, which is used to connect with a locking member, the locking member includes a head end 1101 and a tail end 1102 relative to each other, the locking member includes a first guide portion 111, a second guide portion 112 and a locking portion 113, the circumscribed circle diameter of the radial cross section of the first guide portion 111 is d1, the circumscribed circle diameter of the radial cross section of the second guide portion 112 is d2, d1>d2.

[0166] The implant includes a relative proximal end 1201 and a distal end 1202, and the implant includes an inner surface 1203 extending between the proximal end 1201 and the distal end 1202, the inner surface 1203 includes a first surface 1204, a second surface 1205 and a third surface 1206, the first surface 1204 encloses a first hole segment 121, the second surface 1205 encloses a second hole segment 122, and the third surface 1206 encloses a third hole segment 123; the first hole segment 121 is used for inserting the first guide portion 111, the second hole segment 122 is used for inserting the second guide portion 112, and the third hole segment 123 is used for inserting the locking portion 113 and locking with the locking portion 113.

[0167] During the time period when the locking portion 113 begins to lock with the third hole segment 123, at least a portion of the second guide portion 112 is inserted into the second hole segment 122, and the second surface 1205 abuts against the second guide portion 112 to guide the second guide portion 112, at least a portion of the first guide portion 111 is inserted into the first hole segment 121, and the first surface 1204 abuts against the first guide portion 111 to guide the first guide portion 111, or, at least a portion of the first guide portion 111 is inserted into the third hole segment 123, and the third surface 1206 abuts against the first guide portion 111 to guide the first guide portion 111.

[0168] The third hole segment 123, the first hole segment 121 and the second hole segment 122 are sequentially distributed along the direction X from the proximal end 1201 to the distal end 1202, and the locking portion 113, the first guide portion 111 and the second guide portion 112 are sequentially distributed along the direction X from the head end 1101 to the tail end 1102; or,

[0169] The first hole segment 121, the second hole segment 122 and the third hole segment 123 are sequentially distributed along the direction X from the proximal end 1201 to the distal end 1202, and the first guide portion 111, the second guide portion 112 and the locking portion 113 are sequentially distributed along the direction X from the head end 1101 to the tail end 1102; or,

[0170] Among them, the third hole segment 123 is the first locking hole of the implant along the direction X from the proximal end 1201 to the distal end 1202, and the first hole segment 121, the third hole segment 123 and the second hole segment 122 are distributed in sequence along the direction X from the proximal end 1201 to the distal end 1202, and the first guide portion 111, the locking portion 113 and the second guide portion 112 are distributed in sequence along the direction X from the head end 1101 to the tail end 1102.

[0171] The implant component of the implant assembly can refer to the intramedullary nail main nail 120 in any of the above embodiments, and the locking component of the implant assembly can refer to the tail cap 110 structure in any of the above embodiments, which will not be repeated here.

[0172] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0173] The above is a detailed introduction to a tail cap, a locking piece, an intramedullary nail main nail, an intramedullary nail assembly and an implant assembly provided in the embodiments of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of ​​the present application. Ordinary technical personnel in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An intramedullary nail assembly, characterized in that: include: An intramedullary nail main nail, comprising a proximal end and a distal end opposite to each other, the intramedullary nail main nail comprising an inner surface extending between the proximal end and the distal end, the inner surface comprising a first surface, a second surface and a third surface, the first surface encloses a first hole segment, the second surface encloses a second hole segment, and the third surface encloses a third hole segment; A tail cap, comprising a head end and a tail end opposite to each other, the tail cap comprising a first guide portion, a second guide portion and a locking portion, the diameter of the circumscribed circle of the radial cross section of the first guide portion is d1, the diameter of the circumscribed circle of the radial cross section of the second guide portion is d2, d1>d2; The first guide portion is used to be inserted into the first hole segment, the second guide portion is used to be inserted into the second hole segment, and the locking portion is used to be inserted into the third hole segment and locked with the third hole segment; Wherein, the third hole segment, the first hole segment and the second hole segment are sequentially distributed along the direction from the proximal end to the distal end, and the locking portion, the first guide portion and the second guide portion are sequentially distributed along the direction from the head end to the tail end; or, the first hole segment, the second hole segment and the third hole segment are sequentially distributed along the direction from the proximal end to the distal end, and the first guide portion, the second guide portion and the locking portion are sequentially distributed along the direction from the head end to the tail end; During the period when the locking portion begins to lock with the third hole segment, at least a portion of the second guide portion is inserted into the second hole segment, and the second surface abuts against the second guide portion to guide the second guide portion; Wherein, at least part of the first guide portion is inserted into the first hole section, and the first surface abuts against the first guide portion to guide the first guide portion, or, at least part of the first guide portion is inserted into the third hole section, and the third surface abuts against the first guide portion to guide the first guide portion.

2. The intramedullary nail assembly according to claim 1, characterized in that: An end of the first hole segment close to the proximal end is a first end, an end of the second hole segment close to the proximal end is a second end, and an end of the third hole segment close to the proximal end is a third end; an end of the first guide portion close to the tail end is a fourth end, an end of the second guide portion close to the tail end is a fifth end, and an end of the locking portion close to the tail end is a sixth end; The third hole segment, the first hole segment and the second hole segment are sequentially distributed along the direction from the proximal end to the distal end; the distance between the third end and the second end is H1, and the distance between the first end and the third end is H2; the locking portion, the first guide portion and the second guide portion are sequentially distributed along the direction from the head end to the tail end; the distance between the sixth end and the fifth end is L1, and the distance between the sixth end and the fourth end is L2; Wherein, L1>H1 and L2>H2; and / or, the locking portion is provided with an external thread, the third hole section is a threaded hole section meshing with the external thread, the minor diameter of the locking portion is d3, L1>H1, and d3-d1≤0.5mm; or, The first hole segment, the second hole segment and the third hole segment are distributed in sequence along the direction from the proximal end to the distal end, the distance between the third end and the first end is H3, and the distance between the second end and the third end is H4; the first guide portion, the second guide portion and the locking portion are distributed in sequence along the direction from the head end to the tail end, the distance between the fourth end and the sixth end is L3, the distance between the fifth end and the sixth end is L4, L3<H3 and L4<H4.

3. The intramedullary nail assembly according to claim 1, characterized in that: The diameter of the inscribed circle of the radial cross section of the first hole segment is D1, wherein D1-d1≤0.8mm; and / or, The diameter of the inscribed circle of the radial cross section of the second hole segment is D2, wherein D2-d2≤1.2 mm.

4. The intramedullary nail assembly according to claim 3, characterized in that: The inscribed circle diameter D1 of the radial cross section of the first hole segment and the circumscribed circle diameter d1 of the radial cross section of the first guide portion satisfy: D1-d1≤0.5 mm.

5. The intramedullary nail assembly according to any one of claims 1 to 4, characterized in that: The diameter of the inscribed circle of the radial cross section of the first hole segment is D1, and the diameter of the inscribed circle of the radial cross section of the second hole segment is D2; wherein D1-d1≤D2-d2.

6. An intramedullary nail assembly, characterized in that: include: An intramedullary nail main nail, comprising a proximal end and a distal end opposite to each other, the intramedullary nail main nail comprising an inner surface extending between the proximal end and the distal end, the inner surface comprising a fourth surface, a fifth surface and a sixth surface, the fourth surface encloses a fourth hole segment, the fifth surface encloses a fifth hole segment, the sixth surface encloses a sixth hole segment, the fourth hole segment and the fifth hole segment are sequentially distributed along the direction from the proximal end to the distal end, and the sixth hole segment is the first locking hole of the intramedullary nail main nail along the direction from the proximal end to the distal end; A tail cap, comprising a head end and a tail end opposite to each other, the tail cap comprising a first guide portion, a second guide portion and a locking portion, the first guide portion and the second guide portion being sequentially distributed along the direction from the head end to the tail end, the circumscribed circle diameter of the radial cross section of the first guide portion being d1, the circumscribed circle diameter of the radial cross section of the second guide portion being d2, d1>d2; the first guide portion is used to be inserted into the fourth hole segment, the second guide portion is used to be inserted into the fifth hole segment, and the locking portion is used to be inserted into the sixth hole segment and locked with the sixth hole segment; During the time period when the locking portion begins to lock with the sixth hole segment, at least a portion of the first guide portion is inserted into the fourth hole segment, and the fourth surface is used to abut against the first guide portion to guide the first guide portion; the time period when locking begins Wherein, at least a portion of the second guide portion is inserted into the fifth hole segment, and the fifth surface is used to abut against the second guide portion to guide the second guide portion; or, at least a portion of the second guide portion is inserted into the sixth hole segment, and the sixth surface is used to abut against the second guide portion to guide the second guide portion.

7. The intramedullary nail assembly according to claim 6, characterized in that: The fourth hole segment, the sixth hole segment and the fifth hole segment are sequentially distributed along the direction from the proximal end to the distal end; the first guide portion, the locking portion and the second guide portion are sequentially distributed along the direction from the head end to the tail end.

8. The intramedullary nail assembly according to claim 7, characterized in that: The end of the fourth hole segment close to the proximal end is the seventh end, the end of the fifth hole segment close to the proximal end is the eighth end, and the end of the sixth hole segment close to the proximal end is the ninth end; the end of the first guide portion close to the tail end is the fourth end, the end of the second guide portion close to the tail end is the fifth end, and the end of the locking portion close to the tail end is the sixth end; The distance between the seventh end and the ninth end is H5, the distance between the ninth end and the eighth end is H6, the distance between the fourth end and the sixth end is L5, and the distance between the sixth end and the fifth end is L6; Among them, L5<H5 and L6>H6; and / or, the locking portion is provided with an external thread, the sixth hole segment is a threaded hole segment engaged with the external thread, the minor diameter of the locking portion is d3, L5<H5 and d3-d2≤0.5mm.

9. The intramedullary nail assembly according to claim 6, characterized in that: The diameter of the inscribed circle of the radial cross section of the fourth hole segment is D3, wherein D3-d1≤0.8mm; and / or, The inscribed circle diameter D4 of the radial cross section of the fifth hole segment, wherein D4-d2≤1.2 mm.

10. The intramedullary nail assembly according to claim 9, characterized in that: The inscribed circle diameter D3 of the radial cross section of the fourth hole segment and the circumscribed circle diameter d1 of the radial cross section of the first guide portion satisfy: D3-d1≤0.5mm.

11. The intramedullary nail assembly according to claim 6, characterized in that: The inscribed circle diameter D3 of the radial cross section of the fourth hole segment, the inscribed circle diameter D4 of the radial cross section of the fifth hole segment; wherein D3-d1≤D4-d2.

12. The intramedullary nail assembly according to claim 11, characterized in that: (D4-d2)-(D3-d1)≤0.4mm.

13. The intramedullary nail assembly according to claim 8, characterized in that: A distance H5 between the seventh end and the ninth end, and a distance L8 between the fourth end and the fifth end satisfy: L8 ≥ H5; The sixth hole segment is a threaded hole segment, and the minor diameter of the sixth hole segment is D5; the diameter of the inscribed circle of the radial cross section of the fourth hole segment is D3; wherein, H5>L5*cosα, α=arcsin{(D5+D3-d2-d1) / (2*L8)}.

14. The intramedullary nail assembly according to claim 13, characterized in that: An end of the fourth hole segment close to the proximal end is provided with a chamfer, and a length of the chamfer along the direction from the proximal end to the distal end is C1, wherein H5-C1>L5*cosα.

15. The intramedullary nail assembly according to claim 6, characterized in that: The tail cap also includes a tool retreat groove located between the locking portion and the first guide portion, the length of the tool retreat groove in the direction from the head end to the tail end is L7, the locking portion is a threaded section, and the pitch of the locking portion is P; wherein L7≤P.

16. The intramedullary nail assembly according to claim 15, characterized in that: The tail cap includes a first side surface, the first side surface is located on a side of the undercut groove close to the tail end, the first side surface includes a first edge close to the bottom of the undercut groove, and a second edge opposite to the first edge, the second edge is farther away from the head end than the first edge; The major diameter of the locking portion is d4; the minor diameter of the locking portion is d3; the thread angle of the thread teeth of the locking portion is β; wherein L7≥0.25*P+(d4 / 2-d3 / 2)*tan(β / 2).

17. The intramedullary nail assembly according to claim 15, characterized in that: The tail cap includes a first side surface and a second side surface, the first side surface and the second side surface are sequentially distributed on both sides of the undercut groove along the direction from the head end to the tail end, the second side surface includes a third edge close to the bottom of the undercut groove, and a fourth edge opposite to the third edge, the fourth edge is closer to the head end than the third edge; The minor diameter of the locking portion is d3; the thread angle of the thread teeth of the locking portion is β; wherein L7≥0.25*P+(d1 / 2-d3 / 2)*tan(β / 2).

18. A tail cap, characterized in that: The tail cap is used to connect with the main nail of the intramedullary nail, the main nail of the intramedullary nail comprises a proximal end and a distal end opposite to each other, the main nail of the intramedullary nail comprises an inner surface extending between the proximal end and the distal end, the inner surface comprises a first surface, a second surface and a third surface, the first surface encloses a first hole segment, the second surface encloses a second hole segment, and the third surface encloses a third hole segment; The tail cap includes a head end and a tail end opposite to each other, and includes a first guide portion, a second guide portion and a locking portion, the diameter of the circumscribed circle of the radial cross section of the first guide portion is d1, the diameter of the circumscribed circle of the radial cross section of the second guide portion is d2, and d1>d2; The first guide portion is used to insert into the first hole segment, the second guide portion is used to insert into the second hole segment, and the locking portion is used to insert into the third hole segment and lock with the third hole segment; wherein the third hole segment, the first hole segment and the second hole segment are sequentially distributed along the direction from the proximal end to the distal end, and the locking portion, the first guide portion and the second guide portion are sequentially distributed along the direction from the head end to the tail end; or, the first hole segment, the second hole segment and the third hole segment are sequentially distributed along the direction from the proximal end to the distal end, and the first guide portion, the second guide portion and the locking portion are sequentially distributed along the direction from the head end to the tail end; During the time period when the locking portion begins to lock with the third hole segment, at least a portion of the second guide portion is inserted into the second hole segment, and the second surface abuts against the second guide portion to guide the second guide portion, at least a portion of the first guide portion is inserted into the first hole segment, and the first surface abuts against the first guide portion to guide the first guide portion, or at least a portion of the first guide portion is inserted into the third hole segment, and the third surface abuts against the first guide portion to guide the first guide portion.

19. A tail cap, characterized in that: The tail cap is used to connect with the main nail of the intramedullary nail, the main nail of the intramedullary nail comprises a proximal end and a distal end opposite to each other, the main nail of the intramedullary nail comprises an inner surface extending between the proximal end and the distal end, the inner surface comprises a fourth surface, a fifth surface and a sixth surface, the fourth surface encloses a fourth hole segment, the fifth surface encloses a fifth hole segment, the sixth surface encloses a sixth hole segment, the fourth hole segment and the fifth hole segment are sequentially distributed along the direction from the proximal end to the distal end, and the sixth hole segment is the first locking hole of the main nail of the intramedullary nail along the direction from the proximal end to the distal end; The tail cap comprises a head end and a tail end opposite to each other, the tail cap comprises a first guide portion, a second guide portion and a locking portion, the first guide portion and the second guide portion are sequentially distributed along the direction from the head end to the tail end, the circumscribed circle diameter of the radial cross section of the first guide portion is d1, the circumscribed circle diameter of the radial cross section of the second guide portion is d2, d1>d2; the first guide portion is used to insert into the fourth hole segment, the second guide portion is used to insert into the fifth hole segment, and the locking portion is used to insert into the sixth hole segment and lock with the sixth hole segment; Wherein, during the time period when the locking portion begins to lock with the sixth hole segment, at least a portion of the first guide portion is inserted into the fourth hole segment, and the fourth surface is used to abut against the first guide portion to guide the first guide portion, and at least a portion of the second guide portion is inserted into the fifth hole segment, and the fifth surface is used to abut against the second guide portion to guide the second guide portion; or, at least a portion of the second guide portion is inserted into the sixth hole segment, and the sixth surface is used to abut against the second guide portion to guide the second guide portion.

20. An intramedullary nail main nail, characterized in that: The main intramedullary nail is used to connect with the tail cap, the tail cap includes a head end and a tail end opposite to each other, the tail cap includes a first guide portion, a second guide portion and a locking portion, the diameter of the circumscribed circle of the radial cross section of the first guide portion is d1, the diameter of the circumscribed circle of the radial cross section of the second guide portion is d2, d1>d2; The main intramedullary nail comprises a proximal end and a distal end opposite to each other, the main intramedullary nail comprises an inner surface extending between the proximal end and the distal end, the inner surface comprises a first surface, a second surface and a third surface, the first surface encloses a first hole segment, the second surface encloses a second hole segment, the third surface encloses a third hole segment, the first hole segment is used for the first guide portion to be inserted, the second hole segment is used for the second guide portion to be inserted, and the third hole segment is used for the locking portion to be inserted and locked with the locking portion; During the time period when the locking portion begins to lock with the third hole segment, at least a portion of the second guide portion is inserted into the second hole segment, and the second surface abuts against the second guide portion to guide the second guide portion, at least a portion of the first guide portion is inserted into the first hole segment, and the first surface abuts against the first guide portion to guide the first guide portion, or at least a portion of the first guide portion is inserted into the third hole segment, and the third surface abuts against the first guide portion to guide the first guide portion; Wherein, the third hole segment, the first hole segment and the second hole segment are sequentially distributed along the direction from the proximal end to the distal end, and the locking portion, the first guide portion and the second guide portion are sequentially distributed along the direction from the head end to the tail end; or, wherein the first hole segment, the second hole segment and the third hole segment are sequentially distributed along the direction from the proximal end to the distal end, and the first guide portion, the second guide portion and the locking portion are sequentially distributed along the direction from the head end to the tail end; or, Among them, the third hole segment is the first locking hole of the main nail of the intramedullary nail along the direction from the proximal end to the distal end, and the first hole segment, the third hole segment and the second hole segment are distributed in sequence along the direction from the proximal end to the distal end, and the first guide part, the locking part and the second guide part are distributed in sequence along the direction from the head end to the tail end.

21. An intramedullary nail assembly, characterized in that: include: An intramedullary nail main nail, comprising a proximal end and a distal end opposite to each other, the intramedullary nail main nail comprising an inner surface extending between the proximal end and the distal end, the inner surface and a third surface, the second surface encloses a second hole segment, the third surface encloses a third hole segment, the third hole segment and the second hole segment are sequentially distributed along the direction from the proximal end to the distal end; A tail cap, comprising an opposite head end and a tail end, the tail cap comprising a first guide portion, a second guide portion and a locking portion, the locking portion, the first guide portion and the second guide portion being sequentially distributed along the direction from the head end to the tail end, the first guide portion being used to insert the third hole segment, the second guide portion being used to insert the second hole segment, and the locking portion being used to insert the third hole segment and lock with the third hole segment; the circumscribed circle diameter of the radial cross section of the first guide portion is d1, the circumscribed circle diameter of the radial cross section of the second guide portion is d2, d1>d2; the length of the locking portion in the direction from the head end to the tail end is less than the length of the third hole segment in the direction from the proximal end to the distal end; Wherein, during the time period when the locking portion begins to lock with the third hole segment, at least a portion of the first guide portion is inserted into the third hole segment, and the third surface abuts against the first guide portion to guide the first guide portion, and at least a portion of the second guide portion is inserted into the second hole segment, and the second surface abuts against the second guide portion to guide the second guide portion.

22. An implant assembly, characterized in that: include: An implant, comprising a proximal end and a distal end opposite to each other, the implant comprising an inner surface extending between the proximal end and the distal end, the inner surface comprising a first surface, a second surface and a third surface, the first surface enclosing a first hole segment, the second surface enclosing a second hole segment, and the third surface enclosing a third hole segment; A locking member, comprising a head end and a tail end opposite to each other, the locking member comprising a first guide portion, a second guide portion and a locking portion, the diameter of the circumscribed circle of the radial cross section of the first guide portion is d1, the diameter of the circumscribed circle of the radial cross section of the second guide portion is d2, d1>d2; the first guide portion is used to be inserted into the first hole segment, the second guide portion is used to be inserted into the second hole segment, and the locking portion is used to be inserted into the third hole segment and locked with the third hole segment; During the time period when the locking portion begins to lock with the third hole segment, at least a portion of the second guide portion is inserted into the second hole segment, and the second surface abuts against the second guide portion to guide the second guide portion, at least a portion of the first guide portion is inserted into the first hole segment, and the first surface abuts against the first guide portion to guide the first guide portion, or at least a portion of the first guide portion is inserted into the third hole segment, and the third surface abuts against the first guide portion to guide the first guide portion; Wherein, the locking portion, the first guide portion and the second guide portion are sequentially distributed along the direction from the head end to the tail end, and the third hole segment, the first hole segment and the second hole segment are sequentially distributed along the direction from the proximal end to the distal end; or, Wherein, the first guide portion, the second guide portion and the locking portion are sequentially distributed along the direction from the head end to the tail end, and the first hole segment, the second hole segment and the third hole segment are sequentially distributed along the direction from the proximal end to the distal end; or, Among them, the third hole segment is the first locking hole of the implant along the direction from the proximal end to the distal end, and the first guide portion, the locking portion and the second guide portion are distributed in sequence along the direction from the head end to the tail end, and the first hole segment, the third hole segment and the second hole segment are distributed in sequence along the direction from the proximal end to the distal end.

23. A locking member, characterized in that: The locking member is used to connect with the implant, the implant comprises a proximal end and a distal end opposite to each other, the implant comprises an inner surface extending between the proximal end and the distal end, the inner surface comprises a first surface, a second surface and a third surface, the first surface encloses a first hole segment, the second surface encloses a second hole segment, and the third surface encloses a third hole segment; The locking member comprises a head end and a tail end opposite to each other, and the locking member comprises a first guide portion, a second guide portion and a locking portion, the diameter of the circumscribed circle of the radial cross section of the first guide portion is d1, the diameter of the circumscribed circle of the radial cross section of the second guide portion is d2, and d1>d2; the first guide portion is used to be inserted into the first hole segment, the second guide portion is used to be inserted into the second hole segment, and the locking portion is used to be inserted into the third hole segment and locked with the third hole segment; During the time period when the locking portion begins to lock with the third hole segment, at least a portion of the second guide portion is inserted into the second hole segment, and the second surface abuts against the second guide portion to guide the second guide portion, at least a portion of the first guide portion is inserted into the first hole segment, and the first surface abuts against the first guide portion to guide the first guide portion, or at least a portion of the first guide portion is inserted into the third hole segment, and the third surface abuts against the first guide portion to guide the first guide portion; Wherein, the locking portion, the first guide portion and the second guide portion are sequentially distributed along the direction from the head end to the tail end, and the third hole segment, the first hole segment and the second hole segment are sequentially distributed along the direction from the proximal end to the distal end; or, Wherein, the first guide portion, the second guide portion and the locking portion are sequentially distributed along the direction from the head end to the tail end, and the first hole segment, the second hole segment and the third hole segment are sequentially distributed along the direction from the proximal end to the distal end; or, Among them, the third hole segment is the first locking hole of the implant along the direction from the proximal end to the distal end, and the first guide portion, the locking portion and the second guide portion are distributed in sequence along the direction from the head end to the tail end, and the first hole segment, the third hole segment and the second hole segment are distributed in sequence along the direction from the proximal end to the distal end.

24. An implant, characterized in that: The implant is used to connect with the locking member, the locking member includes a head end and a tail end opposite to each other, the locking member includes a first guide portion, a second guide portion and a locking portion, the diameter of the circumscribed circle of the radial cross section of the first guide portion is d1, the diameter of the circumscribed circle of the radial cross section of the second guide portion is d2, d1>d2; The implant comprises a proximal end and a distal end opposite to each other, the implant comprises an inner surface extending between the proximal end and the distal end, the inner surface comprises a first surface, a second surface and a third surface, the first surface encloses a first hole segment, the second surface encloses a second hole segment, and the third surface encloses a third hole segment; the first hole segment is used for inserting the first guide portion, the second hole segment is used for inserting the second guide portion, and the third hole segment is used for inserting the locking portion and locking with the locking portion; During the time period when the locking portion begins to lock with the third hole segment, at least a portion of the second guide portion is inserted into the second hole segment, and the second surface abuts against the second guide portion to guide the second guide portion, at least a portion of the first guide portion is inserted into the first hole segment, and the first surface abuts against the first guide portion to guide the first guide portion, or at least a portion of the first guide portion is inserted into the third hole segment, and the third surface abuts against the first guide portion to guide the first guide portion; Wherein, the third hole segment, the first hole segment and the second hole segment are sequentially distributed along the direction from the proximal end to the distal end, and the locking portion, the first guide portion and the second guide portion are sequentially distributed along the direction from the head end to the tail end; or, wherein the first hole segment, the second hole segment and the third hole segment are sequentially distributed along the direction from the proximal end to the distal end, and the first guide portion, the second guide portion and the locking portion are sequentially distributed along the direction from the head end to the tail end; or, Among them, the third hole segment is the first locking hole of the implant along the direction from the proximal end to the distal end, and the first hole segment, the third hole segment and the second hole segment are distributed in sequence along the direction from the proximal end to the distal end, and the first guide portion, the locking portion and the second guide portion are distributed in sequence along the direction from the head end to the tail end.

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