Intramedullary nail aiming device

Abstract

The present invention relates to an intramedullary nail aiming device, which includes a handle provided with a positioning part and a connecting part, and the connecting part is provided with a through hole; a connecting sleeve having opposite first and second ends along its axial direction, the inside of the connecting sleeve has a through hole, the first end is nested and matched with the connecting part, wherein one of the first end and the connecting part is provided with a plurality of first mating surfaces, and the other of the two is provided with at least one second mating surface. When the second mating surface fits with the first mating surface, the handle is fixed in the circumferential direction relative to the connecting sleeve; a tightening screw, the distal end of the tightening screw extends out of the second end of the connecting sleeve, and the displacement of the tightening screw in the direction away from the connecting part is restricted; a fastening bolt abuts against the connecting part and is threadedly connected to the first end. When performing an operation, a doctor can perform aiming operations by rotating, eliminating the cumbersome work of disassembling and matching instruments, and greatly optimizing the surgical procedure.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to an intramedullary nail aiming device. Background Art

[0002] Current interlocking intramedullary nail products include a main nail axially inserted into the medullary cavity and multiple locking nails passing through the main nail perpendicular to the main nail or at other angles. As Figure 1 shown, where the vertical one is the main nail and the horizontally arranged ones are the locking nails. Through the interlocking of multiple locking nails, especially the three-dimensional interlocking method of multiple locking nails in different planes, the anti-rotation function of the main nail can be greatly enhanced, and the indication scope of the main nail can be greatly expanded. However, the intramedullary nail surgery is performed by means of an interventional surgery method of making a small incision at one end of the medullary cavity and inserting it into the medullary cavity. After the main nail is inserted into the medullary cavity, the position of the locking nail holes cannot be observed with the naked eye. And since multiple locking nail holes are distributed at different angles at the end of the main nail, during the operation process, different auxiliary means are required to aim at the locking nail holes on the main nail inserted into the medullary cavity to ensure that the locking nails are accurately inserted into the locking nail holes.

[0003] Currently common aiming methods are mechanical aiming and fluoroscopic aiming. Mechanical aiming generally connects a tightening bolt with a handle, and then cooperatively connects the handle with an aiming bracket through a series of conversion brackets, and uses the mechanical locking method of a positioning ejector rod and a lateral threaded pull rod to tightly connect the brackets to ensure the stability and accuracy of aiming. Fluoroscopic aiming is to use a mechanical aiming bracket as an auxiliary and cooperate with X-ray fluoroscopy for aiming, or directly aim by means of X-ray transmission.

[0004] When performing mechanical aiming, in order to meet different angle requirements, it is necessary to adopt a method of converting the angle for aiming. As Figure 2 shown, an intramedullary nail aiming instrument of a traditional technology includes a handle, a connecting sleeve connected to the handle, and a tightening bolt. It positions the main nail by cooperating the connecting sleeve with the main nail, and the tightening bolt passes through the connecting sleeve and is threadedly connected to the main nail to tighten the main nail. This aiming instrument aims at one side direction with the handle. Specifically, it aims at the locking nail hole from the horizontal direction with the handle, as Figure 2 shown by the arrow X in; when aiming at other directions, it is necessary to connect a conversion bracket with the handle to convert the aiming direction by 90° so as to be able to aim at the locking nail hole along the vertical direction, as Figure 2In the direction indicated by arrow Z, while the structure for achieving the remaining aiming angles is provided on the aiming bracket connected to the conversion bracket. Moreover, in order to ensure the accuracy and stability of aiming, the various components of the instrument need to be connected in a precise positioning and fastening manner. Therefore, both the conversion bracket and the aiming bracket need to be provided with tightening nuts for hanging and tightening, and the handle, the conversion bracket, and the aiming bracket also need to be provided with positioning pins for positioning respectively, resulting in a very large number of sub-components for each component, which is very inconvenient for processing and use; and since multiple instruments are connected, in order to ensure that there is no deformation during use, the handle and the conversion bracket need to be designed with increased width and thickness. The heavy handle and conversion bracket, combined with each aiming bracket, make the entire set of aiming instruments very cumbersome and heavy when in use. Generally speaking, the above-mentioned aiming instrument is cumbersome to use, and disassembly and assembly are required when adjusting the aiming, which affects the aiming efficiency. Summary of the Invention

[0005] Based on this, in view of the problem that the traditional intramedullary nail aiming instrument is cumbersome to use and affects the aiming efficiency, it is necessary to provide an intramedullary nail aimer.

[0006] An intramedullary nail aimer includes a handle, the handle is provided with a positioning portion and a connecting portion, and a through hole penetrating the connecting portion is provided on the connecting portion; a connecting sleeve, the connecting sleeve has opposite first and second ends along its axial direction, and a through hole penetrating the connecting sleeve along its axial direction is provided inside the connecting sleeve. The first end is nested and fitted with the connecting portion on one side of the handle. Among them, one of the first end and the connecting portion is provided with a plurality of first mating surfaces, and the other of the two is provided with at least one second mating surface for selectively mating with the plurality of first mating surfaces. When the second mating surface is in contact with the first mating surface, the handle is fixed in the circumferential direction relative to the connecting sleeve; a tightening screw, the distal end of the tightening screw extends out of the second end of the connecting sleeve, and the displacement of the tightening screw in the direction away from the connecting portion is restricted; a fastening bolt, which passes through the through hole from the other side of the handle, the fastening bolt abuts against the connecting portion, and the fastening bolt is threadedly connected to the first end.

[0007] For the above intramedullary nail aiming device, when it is necessary to use the aiming bracket to aim at the hole positions at other angles, only the fastening bolt needs to be removed, and the handle can be separated from the whole formed by the connecting sleeve, the hanging screw and the main nail of the intramedullary nail; then after rotating the handle by a certain angle, the first end of the handle is fitted with the connecting sleeve again, so that the second mating surface fits with different first mating surfaces, and finally the fastening bolt is threadedly connected with the connecting sleeve. By the above means, the rotation of the handle relative to the main nail of the intramedullary nail is realized, and further the rotation of the aiming bracket relative to the main nail of the intramedullary nail is realized, so that the hole positions at other angles can be aimed at. When performing the operation, the doctor can perform the aiming operation by rotating, which saves the complicated work of disassembling and matching the instruments and greatly optimizes the operation process. In addition, the fastening bolt can enable the intramedullary nail aiming device to be well fixed after rotation, providing stability for the aiming operation.

[0008] In one embodiment, the connecting portion is provided with a plurality of the first mating surfaces, which are uniformly distributed on the outer circumference of the connecting portion along the circumferential direction of the through hole; the through hole includes a mating section, and the inner circumference of the mating section has a plurality of the second mating surfaces, and the second mating surfaces match the first mating surfaces, and the mating section is sleeved on the connecting portion.

[0009] In one embodiment, the through hole includes a mating section, a threaded section and a stepped hole that are axially connected in sequence, the threaded section is threadedly connected with the fastening bolt, the proximal end of the hanging screw is accommodated in the stepped hole, and along the direction away from the connecting portion, the hanging screw is axially limited by the stepped hole.

[0010] In one embodiment, the cross-sectional profile at the first mating surface includes first straight segments and first arc segments that are alternately arranged along the circumferential direction; the cross-sectional profile of the inner wall of the mating section includes second straight segments and second arc segments that are alternately arranged along the circumferential direction.

[0011] In one embodiment, the cross-sectional profile of the outer wall of the mating section includes third straight segments and third arc segments that are alternately arranged along the circumferential direction, and the straight segments on the inner and outer walls of the mating section are in corresponding positions, and the arc segments on the inner and outer walls of the mating section are in corresponding positions.

[0012] In one embodiment, the cross-sectional profile of the connecting portion at the first mating surface is a regular polygon, and the cross-sectional profile of the inner wall of the mating section is a regular polygon, and the shapes of the two polygons are the same.

[0013] In one embodiment, a convex platform is provided at the proximal end of the hanging screw, one side of the convex platform close to the second end abuts against the step of the stepped hole, and an operation hole is opened on the side of the convex platform away from the second end.

[0014] In one embodiment, the handle includes an arc-shaped main body, and the positioning portion and the connecting portion are disposed at opposite ends of the arc-shaped main body, wherein the arc-shaped main body extends from the connecting portion toward the side where the connecting sleeve is disposed.

[0015] In one embodiment, a pin hole is formed in the end surface of the positioning portion, a threaded hole axially communicating with the pin hole is further provided at the bottom of the pin hole, and a positioning groove extending along the axial direction of the pin hole is provided on the inner wall of the pin hole.

[0016] An intramedullary nail aiming device includes a handle; a connecting sleeve having opposite first and second ends along its axial direction, the first end being detachably nested with the handle, and the second end being adapted to cooperate with the intramedullary nail, wherein the connecting sleeve and the handle have a plurality of mating positions with a phase difference from each other in the circumferential direction; a fastening bolt threadedly connected to the connecting sleeve to enable the connecting sleeve and the handle to be held at a certain mating position; a tightening screw, the displacement in the direction away from the connecting sleeve is restricted, and the distal end extends out of the second end of the connecting sleeve.

[0017] In one embodiment, the handle has a connecting portion, the cross-sectional profile of the connecting portion is polygonal, the first end has an inner hole that can be sleeved on the connecting portion, the cross-sectional profile of the inner hole is polygonal, and the shapes of the two polygons are the same; alternatively, the cross-sectional profile of the connecting portion includes straight segments and arc segments alternately arranged in the circumferential direction; the first end has an inner hole that can be sleeved on the connecting portion, and the cross-sectional profile of the inner hole includes straight segments and arc segments alternately arranged in the circumferential direction. Description of the Drawings

[0018] Figure 1 Schematic diagram of the three-dimensional interlocking method of the locking nail during intramedullary nail surgery.

[0019] Figure 2 Exploded view of a traditional intramedullary nail aiming instrument.

[0020] Figure 3 Cross-sectional schematic view of the intramedullary nail aiming device according to an embodiment of the present invention.

[0021] Figure 4 Exploded view of the intramedullary nail aiming device according to an embodiment of the present invention.

[0022] Figure 5 For Figure 4 Right view of the handle in

[0023] Figure 6 For Figure 5 Cross-sectional view taken along line A-A in

[0024] Figure 7Structural diagram of the connecting sleeve of the intramedullary nail aiming device according to an embodiment of the present invention.

[0025] Figure 8 is Figure 7 A cross-sectional view taken along the B-B direction in the figure.

[0026] Figure 9 is Figure 7 Left view of the connecting sleeve shown.

[0027] Figure 10 Structural diagram of the fastening bolt of the intramedullary nail aiming device according to an embodiment of the present invention.

[0028] Figure 11 is Figure 10 A cross-sectional view taken along the C-C direction in the figure.

[0029] Figure 12 is Figure 10 Left view of the fastening bolt shown.

[0030] Figure 13 Structural diagram of the tightening screw of the intramedullary nail aiming device according to an embodiment of the present invention.

[0031] Figure 14 is Figure 13 A cross-sectional view taken along the D-D direction in the figure.

[0032] Figure 15 is Figure 13 Left view of the tightening screw shown.

[0033] The corresponding numbers of the relevant components in the figure are as follows:

[0034] 1. Handle; 2. Connecting sleeve; 3. Tightening bolt; 4. Conversion bracket; 5. Aiming bracket; 6. Tightening nut; 7. Positioning pin; 100. Intramedullary nail aiming device; 10. Handle; 110. Arc-shaped main body; 120. Positioning part; 121. Pin hole; 122. Threaded hole; 123. Positioning groove; 130. Connecting part; 131. Through hole; 132. First mating surface; 133. First straight segment; 134. First arc segment; 20. Connecting sleeve; 210. First end; 211. Second mating surface; 212. Second straight segment; 213. Second arc segment; 214. Third straight segment; 215. Third arc segment; 220. Second end; 221. Convex part; 230. Through hole; 231. Fitting section; 232. Threaded section; 233. Step hole; 2331. Step; 30. Tightening screw; 310. Boss; 311. Operation hole; 40. Fastening bolt; 410. Head; 411. Driving hole; 420. Bolt part; 421. External thread; 430. Internal channel. Detailed implementation manners

[0035] To make the above objects, features, and advantages of the present invention more apparent and understandable, the following provides a detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings. Many specific details are set forth in the following description to facilitate a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0037] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0038] In the present invention, unless otherwise clearly specified and limited, the terms "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over", and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "below", "beneath", and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0040] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation.

[0041] Embodiments of the present invention provide an intramedullary nail aiming device 100, combined with Figure 3 and Figure 4 As shown, it includes a handle 10, a connecting sleeve 20, a tightening screw 30 and a fastening bolt 40. During surgery, one end of the connecting sleeve 20 is connected to the handle 10, and the other end of the connecting sleeve 20 is used to connect the end of the intramedullary nail main nail (not shown); the tightening screw 30 passes through the connecting sleeve 20 and is threadedly connected to the intramedullary nail main nail to tighten the intramedullary nail main nail; the fastening bolt 40 passes through the handle 10 and is inserted into the connecting sleeve 20, and the outer thread at its end tightens the connecting sleeve 20.

[0042] As Figure 4 shown, in one embodiment, the handle 10 includes an arc-shaped main body 110, and positioning portions 120 and connecting portions 130 are respectively provided at opposite ends of the arc-shaped main body 110, wherein the positioning portion 120 is used to connect an aiming bracket (not shown), and the connecting portion 130 is used to cooperate with the connecting sleeve 20 and the fastening bolt 40.

[0043] Combined with Figure 3 and Figure 4 As shown, after the intramedullary nail aiming device 100 is assembled, the connecting sleeve 20 and the fastening bolt 40 are respectively fitted to the handle 10 from both sides of the handle 10, and the arc-shaped main body 110 extends from the connecting portion 130 toward the side where the connecting sleeve 20 is provided. In this way, after the aiming bracket is connected to the positioning portion 120, the aiming bracket and the connecting sleeve 20 are on the same side of the handle 10 for aiming at the locking nail for interlocking.

[0044] The aiming accuracy of the intramedullary nail instrument is a very important parameter, so the design of the cooperation structure between each aiming instrument is also very important. Combined with Figure 3 and Figure 6As shown in the figure, in this embodiment, a pin hole 121 is formed on the end face of the positioning portion 120. The axial direction of the pin hole 121 is the same as that of the connecting sleeve 20. A threaded hole 122 axially communicating with the pin hole 121 is further provided at the bottom of the pin hole 121, and a positioning groove 123 extending along the axial direction of the pin hole 121 is provided on the inner wall of the pin hole 121. When the positioning portion 120 is connected to the aiming bracket, the aiming bracket is firmly fixed through the threaded connection between the threaded hole 122 and the aiming bracket, the aiming bracket is centered through the pin hole 121, and the aiming bracket is rotationally positioned through the positioning groove 123. Thus, a triple-functional hole is provided on the positioning portion 120, realizing the functions of firm fixation and precise positioning integrated at one position. The structure of the docking portion of the aiming bracket is set to be able to cooperate with the above-mentioned pin hole 121, threaded hole 122, and positioning groove 123.

[0045] In other embodiments, the high-precision threaded hole 122 can also be used to achieve the purpose of fixation and precise positioning. It can also be that the ordinary-precision threaded hole 122 is used to achieve the fixation function, and other positioning structures are added to achieve central positioning and rotational positioning.

[0046] Combined with Figure 3 、 Figure 4 and Figure 6 As shown in the figure, a through hole 131 penetrating the connecting portion 130 is provided on the connecting portion 130 of the handle 10. The connecting sleeve 20 is located on the right side of the handle 10 and is nested with the connecting portion 130; the fastening bolt 40 passes through the through hole 131 from the left side of the handle 10 and is threadedly connected to the connecting sleeve 20, so that the connecting sleeve 20 and the handle 10 remain relatively stationary.

[0047] Specifically, combined with Figures 13 to 15 As shown in the figure, the fastening bolt 40 includes a head 410 and a bolt portion 420. An inner hexagonal driving hole 411 is formed in the head 410. An external thread 421 is provided at one end of the bolt portion 420 away from the head 410. The bolt portion 420 passes through the through hole 131 and is threadedly connected to the connecting sleeve 20, and the head 410 is used to abut against the connecting portion 130. Since the head 410 of the fastening bolt 40 is provided with an inner hexagonal driving hole 411, it is convenient to use a driving tool to tighten the fastening bolt 40. The shape of the driving hole 411 is not limited to the above-mentioned inner hexagon, and it can also be a plum-shaped inner hole. The interior of the fastening bolt 40 is hollowly arranged to form an internal passage 430 for the ball head probe to pass through.

[0048] Combined with Figures 7 to 9 As shown in the figure, the connecting sleeve 20 is a longitudinally extending cylindrical element along its axis, having opposite first end 210 and second end 220 along its axis. An through hole 230 penetrating the connecting sleeve 20 along its axis is provided inside the connecting sleeve 20. As Figure 3As shown, the first end 210 of the connecting sleeve 20 is sleeved on the connecting portion 130 and is threadedly connected to the fastening bolt 40. The second end 220 of the connecting sleeve 20 is used to cooperate with the intramedullary nail main nail. The distal end of the tightening screw 30 extends out of the second end 220 and is locked and fixed to the thread inside the main nail through the thread, and its movement in the direction away from the connecting portion 130 is restricted. In a preferred embodiment, the proximal end of the tightening screw 30 is received in the through hole 230, and the head 310 abuts against the step 2331 and is limited by the connecting sleeve 20. Here, the distal end refers to the end away from the operator, and correspondingly, the proximal end refers to the end close to the operator. In other embodiments, the tightening screw 30 can also be limited by an element inserted into the connecting sleeve 20 from the outside, or the proximal end of the tightening screw 30 extends into the fastening bolt 40 and is fixed by the fastening bolt 40.

[0049] During the operation, the second end 220 of the connecting sleeve 20 cooperates with the intramedullary nail main nail to achieve precise positioning. The tightening screw 30 passes through the inside of the connecting sleeve 20 and is threadedly connected to the intramedullary nail main nail, so that the tightening screw 30, the connecting sleeve 20 and the intramedullary nail main nail form a mutually fastened whole. The tightening screw 30 is firmly fixed to the intramedullary nail main nail, and the tightening screw 30 is axially limited by the connecting sleeve 20, and the tightening screw 30 has good positioning accuracy in the axial direction of the instrument. After the fastening bolt 40 is threadedly connected to the connecting sleeve 20, the connecting sleeve 20 is pressed against the connecting portion 130 of the handle 10. By the above means, the handle 10 and the intramedullary nail main nail are firmly fixed and precisely positioned axially.

[0050] As Figure 7 shown, the second end 220 of the connecting sleeve 20 is provided with an arc-shaped convex portion 221 for cooperating with the matching structure on the intramedullary nail main nail. It can be understood that the second end 220 of the connecting sleeve 20 is not limited to being provided with the above-mentioned arc-shaped convex portion 221.

[0051] During the use of the above-mentioned intramedullary nail aiming device 100, the aiming bracket is used to aim at the hole positions on the intramedullary nail main nail. As is well known to those skilled in the art, multiple hole positions on the intramedullary nail main nail are provided at different angles, and it is necessary to be able to aim at different hole positions.

[0052] To solve the above problems, in the embodiments of the present invention, by rotating the aiming bracket, the holes on the intramedullary nail main nail are aimed, so that there is no need to replace the bracket, greatly simplifying the surgical instruments, reducing the surgical difficulty, reducing the overall surgical time, and improving the surgical efficiency. Moreover, since there is no need to replace the bracket, the total weight of the aiming bracket is reduced, which is convenient for doctors to use. Since the aiming bracket is connected to the handle 10, in the embodiments of the present invention, the handle 10 is arranged to be rotatable circumferentially relative to the connecting sleeve 20, and the position of the aiming bracket is changed by rotating the handle 10 so as to aim at different holes. Here, the circumferential direction refers to the circumferential direction around the axis of the connecting sleeve 20, and also the circumferential direction around the axis of the through hole 131.

[0053] Combined with Figure 3 、 Figure 4 、 Figure 6 、 Figure 8 As shown, the first end 210 of the connecting sleeve 20 is nested and cooperated with the connecting portion 130 on one side of the handle 10 and they are separable from each other, that is, they are cooperated in a separable nested manner. Among the first end 210 and the connecting portion 130, one of them is provided with a plurality of first mating surfaces 132, and the other of them is provided with at least one second mating surface 211 for selectively mating with the plurality of first mating surfaces 132. When the second mating surface 211 is in contact with the first mating surface 132, the handle 10 is fixed circumferentially relative to the connecting sleeve 20, that is, at this time, the connecting sleeve 20 and the handle 10 cannot rotate relative to each other.

[0054] During the operation, the second mating surface 211 is in contact with the first mating surface 132, and the connecting sleeve 20 and the handle 10 are restricted from rotating relative to each other. At the same time, the fastening bolt 40 is threadedly connected to the connecting sleeve 20, and the connecting sleeve 20 is pressed against the connecting portion 130 of the handle 10, and the connecting sleeve 20 and the handle 10 cannot move axially relative to each other either. In this way, in the axial and circumferential directions, the connecting sleeve 20 and the handle 10 are both positioned. At this time, the aiming bracket can be used to aim at the holes on the intramedullary nail main nail. When it is necessary to use the aiming bracket to aim at the holes at other angles, only the fastening bolt 40 needs to be removed, and the whole composed of the handle 10, the connecting sleeve 20, the hanging screw 30 and the intramedullary nail main nail can be separated. Then, after rotating the handle 10 by a certain angle, the first end 210 of the handle 10 is cooperated with the connecting sleeve 20 to make the second mating surface 211 contact with different first mating surfaces 132, and finally the fastening bolt 40 is threadedly connected to the connecting sleeve 20 again. By the above means, the rotation of the handle 10 relative to the intramedullary nail main nail is realized, and further the rotation of the aiming bracket relative to the intramedullary nail main nail is realized, so that the aiming bracket can be used to aim at the holes at other angles.

[0055] The intramedullary nail aiming device 100 of the above embodiment enables the doctor to perform the aiming operation by rotation during the operation, eliminating the cumbersome work of disassembling and matching instruments and greatly optimizing the surgical process. In addition, the fastening bolt 40 can fix the handle 100 well after rotation, providing stability for the aiming operation.

[0056] As Figure 3 shown, the first end 210 of the connecting sleeve 20 is nested and fitted with the connecting portion 130. Specifically, the first end 210 of the connecting sleeve 20 is sleeved on the connecting portion 130. It can be understood that in other embodiments, the situation can be exactly the opposite. In this embodiment, as Figure 3 shown, with reference to Figure 13 , the length of the bolt portion 420 of the fastening bolt 40 is set to pass through the through hole 131 and extend into the connecting sleeve 20, where the end face of the bolt portion 420 extends out of the end face of the through hole 131. In other embodiments, by designing the matching method or length of the connecting sleeve 20 and the connecting portion 130, for example, the connecting portion 130 is sleeved on the first end 210 of the connecting sleeve 20, and after the bolt portion 420 is inserted into the through hole 131, the end face of the bolt portion 420 can be just flush with the end face of the through hole 131.

[0057] Specifically, there are multiple first mating surfaces 132, and the second mating surface 211 is at least one. Preferably, the second mating surface 211 matches the first mating surface 132. Specifically, the number, phase difference, and shape of the second mating surface 211 are the same as those of the first mating surface 132. In this way, every time the handle 10 rotates, multiple second mating surfaces 211 and the first mating surfaces 132 are in mutual contact, and the first mating surface 132 contacted by each second mating surface 211 changes before and after the rotation of the handle 10.

[0058] Combined with Figure 6 and Figure 8 shown, the connecting portion 130 is provided with multiple first mating surfaces 132, and the first mating surfaces 132 are uniformly distributed on the outer circumference of the through hole 131 along the circumferential direction of the through hole 131. The connecting sleeve 20 is provided with second mating surfaces 211 having the same number as the first mating surfaces 132. Specifically, as Figure 8 shown, starting from the first end 210 of the connecting sleeve 20, along the axial direction of the connecting sleeve 20, the through hole 230 includes a mating section 231, a threaded section 232, and a stepped hole 233 that are sequentially connected. Among them, the mating section 231 is used to be sleeved on the connecting portion 130, and multiple second mating surfaces 211 are uniformly distributed along the circumferential direction of the inner circumference of the mating section 231. The threaded section 232 has an internal thread. A step 2331 is formed on the inner wall of the stepped hole 233. As Figure 10 shown, one end of the tightening screw 30 is provided with a boss 310, and the other end is provided with a thread.

[0059] When assembling the intramedullary nail aiming device 100, insert the tightening screw 30 from the first end 210 into the connecting sleeve 20, and make the boss 310 of the tightening screw 30 abut against the aforementioned step 2331, so that along the direction away from the connecting portion 130, the tightening screw 30 is axially limited by the step 2331, and the other end of the tightening screw 30 extends out of the second end 220 of the connecting sleeve 20; then tighten the tightening screw 30 to threadedly connect it with the main nail of the intramedullary nail; next, fit the fitting section 231 over the connecting portion 130 of the handle 10, and use the fastening bolt 40 to pass through the through hole 131 and threadedly connect it with the threaded section 232, so that the connecting sleeve 20 and the handle 10 are fixed together.

[0060] Further, in order to facilitate tightening the tightening screw 30, as shown in Figure 11 and Figure 12 an operation hole 311 is provided on one side of the boss 310 of the tightening screw 30 away from the second end 220 for use in cooperation with a tool. The operation hole 311 is specifically an internal hexagonal drive hole 411.

[0061] During specific implementation, the structures of the first mating surface 132 and the second mating surface 211 are not limited, as long as there are multiple mating positions with a phase difference in the circumferential direction between the connecting sleeve 20 and the handle 10. Having a phase difference between different mating positions means that if one component is used as a reference, the other component needs to be rotated by a certain angle to achieve a mating position. For example, taking the connecting sleeve 20 as a reference, at different mating positions, the positions of the handle 10 in the rotation plane of the handle 10 are different, and there is an angular difference between different positions. Preferably, the first mating surface 132 encloses a regular prism, and the second mating surface 211 encloses a regular prism with the same bottom surface as the above, and the bottom surface of the regular prism can also form a chamfer or a circular arc chamfer.

[0062] After the fastening bolt 40 is threadedly connected to the connecting sleeve 20, the connecting sleeve 20 and the handle 10 are held in the current mating position; after removing the fastening bolt 40, the connecting sleeve 20 and the handle 10 can rotate relative to each other to re-achieve mating, and then the fastening bolt 40 can be used again.

[0063] As shown in Figure 5 and Figure 6As shown, in one embodiment, the cross-sectional profile of the first mating surface 132 of the connecting portion 130 includes first straight segments 133 and first arc segments 134 that are alternately arranged in the circumferential direction. The first straight segments 133 are used to form the first mating surface 132. The above structure can be understood as being formed by arranging a plurality of planes on the outer wall of the through hole 131 in the circumferential direction. Among them, the planes are used to form the above-mentioned first straight segments 133, and the arcs between the planes are used to form the above-mentioned first arc segments 134. It should be noted that during specific setting, along the axial direction of the through hole 131, the length of the first mating surface 132 is less than the length of the through hole 131, and the first mating surface 132 only needs to meet the socketing requirement with the mating section 231. Here, the cross-section refers to the section along the radial direction of the through hole 131. Since the axial direction of the through hole 131 is the same as the axial direction of the connecting sleeve 20 after assembly, the cross-section here is also the section along the radial direction of the connecting sleeve 20.

[0064] Correspondingly, as Figure 9 shown, the cross-sectional profile of the mating section 231 includes second straight segments 212 and second arc segments 213 that are alternately arranged in the circumferential direction, and their numbers are the same as those of the first straight segments 133 and the first arc segments 134 respectively. The second straight segments 212 are used to form the second mating surface 211; the above structure can be understood as being formed by arranging a plurality of planes on the inner wall of the mating section 231 in the circumferential direction. Among them, the planes are used to form the above-mentioned second straight segments 212, and the arcs between the planes are used to form the above-mentioned second arc segments 213. When the connecting portion 130 is nested and mated with the mating section 231, the first straight segment 133 of the connecting portion 130 is in mutual contact with the second straight segment 212 of the mating section 231, and the first arc segment 134 of the connecting portion 130 is in mutual contact with the second arc segment 213 of the mating section 231, so that the function of rotating the handle 10 at a predetermined angle can be achieved. Here, the cross-section refers to the section along the radial direction of the connecting sleeve 20. Since the axial direction of the through hole 131 is the same as the axial direction of the connecting sleeve 20 after assembly, the cross-section here is also the section along the radial direction of the through hole 131.

[0065] Furthermore, as Figure 9 shown, the cross-sectional profile of the first end 210 is set to include third straight segments 214 and third arc segments 215 that are alternately arranged in the circumferential direction, and the third straight segments 214 correspond to the second straight segments 212 in position, and the third arc segments 215 correspond to the second arc segments 213 in position. Similarly, the cross-section here refers to the section along the radial direction of the connecting sleeve 20. That is to say, both the inner wall and the outer wall of the mating section 231 are provided with straight segments and arc segments that are alternately arranged in the circumferential direction, and the straight segments correspond in position, and the arc segments correspond in position. By the above means, the wall thickness of the through hole 230 at the mating section 231 is uniform, the structural strength is uniform, and it is not easy to break.

[0066] In other embodiments, the cross-sectional profile of the first mating surface 132 of the connecting portion 130 is a regular polygon, and the cross-sectional profile of the mating section 231 is a regular polygon, and the shapes of the two polygons are the same. By the above means, it is also possible to achieve that the connecting sleeve 20 and the handle 10 have a plurality of mating positions with a phase difference from each other in the circumferential direction. In specific implementation, the above regular polygon can be a triangle, a quadrilateral, a pentagon, a hexagon, etc.

[0067] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0068] The above-described embodiments merely represent several implementation manners of the present invention, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent should be subject to the appended claims.

Claims

1. An intramedullary nail aiming device, characterized in that, it includes a handle, the handle is provided with a positioning part and a connecting part, and a through hole penetrating the connecting part is provided on the connecting part; a connecting sleeve, the connecting sleeve has opposite first and second ends along its axial direction, the inside of the connecting sleeve has a through hole penetrating the connecting sleeve along its axial direction, the first end is nested and matched with the connecting part on one side of the handle, wherein one of the first end and the connecting part is provided with a plurality of first mating surfaces, and the other of the two is provided with at least one second mating surface for selectively mating with the plurality of first mating surfaces. When the second mating surface is attached to the first mating surface, the handle is fixed circumferentially relative to the connecting sleeve. The through hole includes a mating section, a threaded section and a stepped hole that are axially connected in sequence; a tightening screw, the proximal end of the tightening screw is located in the through hole, the distal end of the tightening screw extends out of the second end of the connecting sleeve, and the displacement of the tightening screw in the direction away from the connecting part is restricted. Wherein the proximal end of the tightening screw is accommodated in the stepped hole, and along the direction away from the connecting part, the tightening screw is axially limited by the stepped hole; a fastening bolt, passing through the through hole from the other side of the handle, the fastening bolt abuts against the connecting part, and the fastening bolt is threadedly connected to the first end, and the threaded section is threadedly connected to the fastening bolt.

2. The intramedullary nail aiming device according to claim 1, characterized in that, the connecting part is provided with a plurality of the first mating surfaces, which are evenly distributed on the outer circumference of the connecting part along the circumference of the through hole; the inner circumference of the mating section has a plurality of the second mating surfaces, the second mating surfaces are matched with the first mating surfaces, and the mating section is sleeved on the connecting part.

3. The intramedullary nail aiming device according to claim 2, characterized in that, the cross-sectional profile of the first mating surface includes a first straight line segment and a first arc segment alternately arranged along the circumference; the cross-sectional profile of the inner wall of the mating section includes a second straight line segment and a second arc segment alternately arranged along the circumference.

4. The intramedullary nail aiming device according to claim 2, characterized in that, the cross-sectional profile of the first mating surface is a regular polygon, the cross-sectional profile of the inner wall of the mating section is a regular polygon, and the shapes of the two polygons are the same.

5. The intramedullary nail aiming device according to claim 1, characterized in that, the proximal end of the tightening screw is provided with a boss, one side of the boss close to the second end abuts against the step of the stepped hole, and an operation hole is opened on the side of the boss away from the second end.

6. The intramedullary nail aiming device according to claim 1, characterized in that, the handle includes an arc-shaped main body, the positioning part and the connecting part are arranged at opposite ends of the arc-shaped main body, wherein the arc-shaped main body extends from the connecting part towards the side where the connecting sleeve is arranged.

7. The intramedullary nail aiming device according to claim 1, characterized in that, A pin hole is formed on the end face of the positioning portion. A threaded hole axially communicating with the pin hole is further provided at the bottom of the pin hole. A positioning groove extending along the axial direction of the pin hole is provided on the inner wall of the pin hole.

8. An intramedullary nail aiming device Characterized in that it comprises a handle, the handle is provided with a positioning portion and a connecting portion, and a through hole penetrating through the connecting portion is provided on the connecting portion; a connecting sleeve, the connecting sleeve has opposite first and second ends along its axial direction, an through hole axially penetrating through the connecting sleeve is formed inside the connecting sleeve, the first end is in separable nested fit with the connecting portion of the handle on one side of the handle, and the second end is used for cooperating with the intramedullary nail, wherein the connecting sleeve and the handle have a plurality of mating positions with phase differences from each other in the circumferential direction; a fastening bolt, threadedly connected to the connecting sleeve so that the connecting sleeve and the handle can be kept at a certain mating position, the fastening bolt passes through the through hole from the other side of the handle, the fastening bolt abuts against the connecting portion, and the fastening bolt is threadedly connected to the first end; the through hole includes a mating section, a threaded section and a stepped hole axially communicating in sequence, and the threaded section is threadedly connected to the fastening bolt; a tightening screw, the proximal end of the tightening screw is located in the through hole, the displacement of the tightening screw along the direction away from the connecting sleeve is limited, and the distal end of the tightening screw extends out of the second end of the connecting sleeve, wherein the proximal end of the tightening screw is received in the stepped hole, and along the direction away from the connecting portion, the tightening screw is axially limited by the stepped hole.

9. The intramedullary nail aiming device according to claim 8, Characterized in that the cross-sectional profile of the connecting portion is polygonal, the first end of the connecting sleeve has an inner hole that can be sleeved on the connecting portion, the cross-sectional profile of the inner hole is polygonal, and the cross-sectional profiles of the connecting portion and the inner hole are the same in shape; or, the cross-sectional profile of the connecting portion includes straight segments and arc segments alternately arranged in the circumferential direction; the first end of the connecting sleeve has an inner hole that can be sleeved on the connecting portion, and the cross-sectional profile of the inner hole includes straight segments and arc segments alternately arranged in the circumferential direction.

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