A sighting device

Abstract

This invention provides an aiming device, including a loading mechanism, an aiming base, and a locking mechanism. The loading mechanism is used to load a target object. The aiming base has an aiming channel for the loading mechanism to pass through. The locking mechanism is disposed on the aiming base and selectively engages or disengages from the loading mechanism. The aiming device is configured such that when the loading mechanism is partially inserted into the aiming channel and is in a predetermined position, the locking mechanism engages with the loading mechanism and locks it on the aiming base, preventing movement of the loading mechanism relative to the aiming base. When the locking mechanism disengages from the loading mechanism, movement of the loading mechanism relative to the aiming base is permitted. This aiming device allows the fourth screw hole of the lag screw in the intramedullary nail assembly to be coaxial with the first screw hole of the main nail after insertion into the medullary cavity, thereby enabling rapid insertion of the locking screw.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and specifically to an aiming device. Background Technology

[0002] In fracture surgery using interlocking intramedullary nails, to improve the overall mechanical properties and anti-rotation performance of the intramedullary nail and address clinical indications such as lack of fracture support, various types of nails have emerged on the market. Figures 1 to 3 The intramedullary nail assembly shown includes a main nail 10, a traction screw 20, a locking screw 30, and a lower locking screw 40. The main nail 10 has a first hole 11 and a second hole 12 at its proximal end (the end of the main nail 10 closest to the heart during normal use). The axes of the first hole 11 and the second hole 12 are inclined relative to each other. The main nail 10 also has a third hole 13 at its distal end (the end of the main nail 10 furthest from the heart during normal use). The traction screw 20 has a fourth hole 21. In use, after the main nail 10 is inserted into the medullary cavity, the lower locking screw 40 is inserted into the medullary cavity and passes through the third hole 13, the traction screw 20 is inserted into the medullary cavity and passes through the second hole 12, and the locking screw 30 is inserted into the medullary cavity and passes through the first hole 11 and the fourth hole 21 in sequence, thus forming a stable triangular structure. Because the axes of the first nail hole 11 and the second nail hole 12 are inclined to each other, it is difficult to observe these two nail holes simultaneously after the main nail 10 is inserted into the medullary cavity. Moreover, when inserting the tension screw 20, it is necessary to control the insertion depth of the tension screw 20 to ensure that the axis of the fourth nail hole 21 coincides with the axis of the first nail hole 11, thereby ensuring that the locking nail 30 can be inserted smoothly. This usually requires the aid of an aiming mechanism.

[0003] Existing aiming mechanisms include two types: mechanical aiming mechanisms and fluoroscopic aiming mechanisms. Mechanical aiming relies solely on the aiming mechanism for aiming operations, only ensuring that the axes of the two aiming holes on the aiming mechanism correspond to the axes of the first nail hole 11 and the second nail hole 12, respectively. When inserting the traction screw 20, it is difficult to control the depth of the traction screw 20 into the medullary cavity, thus failing to guarantee that the axis of the fourth nail hole 21 coincides with the axis of the first nail hole 11 after the traction screw 20 is inserted into the medullary cavity. This is detrimental to the insertion of the locking screw 30. Fluorescent aiming, on the other hand, uses a mechanical aiming bracket as an aid, combined with X-ray fluoroscopy for aiming, or directly uses X-ray fluoroscopy for aiming. This method poses radiation hazards and has poor aiming effect, resulting in a longer operation time. Summary of the Invention

[0004] The purpose of this invention is to provide an aiming device that can improve the positioning accuracy of intramedullary nails when they are placed into the medullary cavity, thereby shortening the operation time.

[0005] To achieve the above objectives, the present invention provides an aiming device, including a loading mechanism, an aiming base, and a locking mechanism; wherein, the loading mechanism is used to load a target object; the aiming base is provided with an aiming channel for passing through the loading mechanism; the locking mechanism is disposed on the aiming base and selectively connects to or disconnects from the loading mechanism;

[0006] The aiming device is configured such that when the loading mechanism partially passes through the aiming channel and is in a predetermined position, the locking mechanism can engage with the loading mechanism and lock the loading mechanism onto the aiming mount to prevent the loading mechanism from moving relative to the aiming mount; when the locking mechanism is disengaged from the loading mechanism, the loading mechanism is allowed to move relative to the aiming mount.

[0007] Optionally, the locking mechanism includes a slider, a pull rod, an elastic element, and a second locking part; the slider is movably mounted on the aiming base, and a guide groove is provided on the slider, with a first position within the guide groove; one end of the pull rod is connected to the aiming base, and the other end is a sliding end, which is disposed within the guide groove and can move within the guide groove as the slider moves; one end of the elastic element is connected to the aiming base, and the other end is connected to the slider; the second locking part is disposed at the end of the slider facing the aiming channel;

[0008] The aiming device is configured such that when the slider moves on the aiming base to bring the sliding end of the lever to the first position, the sliding end stops sliding, the elastic element stores elastic potential energy, and the second locking part is connected to the loading mechanism; when the slider moves to disengage the sliding end of the lever from the first position and the elastic element releases elastic potential energy, the slider drives the second locking part to move away from the aiming channel, thereby disengaging the second locking part from the loading mechanism.

[0009] Optionally, the aiming channel extends through the aiming base in a first direction, and the aiming base has a first end and a second end opposite to each other in a second direction, the second direction being perpendicular to the first direction; the slider is disposed on the side of the aiming channel near the first end, and the guide groove is at least partially formed into an annular structure, within which a second position, a first position, and a third position are sequentially provided, the first position being located on the side of the second position and the third position near the second end; the groove walls of the second position and the third position abut against the sliding end of the pull rod to prevent the slider from moving along the direction from the first end to the second end, and the groove wall of the first position abuts against the sliding end of the pull rod to prevent the elastic element from releasing elastic potential energy;

[0010] The aiming device is configured such that when the slider moves from the first end to the second end under the action of an external force, the sliding end of the lever moves from the second end to the first end, and the elastic element stores elastic potential energy; when the elastic element at least partially releases the elastic potential energy, the slider moves from the second end to the first end, and the sliding end of the lever moves from the first end to the second end.

[0011] Optionally, the guide groove includes a first segment, a second segment, a third segment, and a fourth segment; the second segment is connected to the first segment at an angle and forms a first corner with an opening facing the second end, and the end of the second segment closer to the first segment constitutes the second position; the third segment is connected to the second segment at an angle and forms a second corner with an opening facing the first end, and the end of the third segment closer to the second segment constitutes the first position; the fourth segment is connected to the third segment at an angle and forms a third corner with an opening facing the second end, and the end of the fourth segment closer to the third segment constitutes the third position; the end of the fourth segment away from the third segment communicates with the first segment so that the guide groove at least partially forms the annular structure.

[0012] Optionally, at the intersection of the first segment and the second segment, the depth of the first segment is less than the depth of the second segment.

[0013] Optionally, at the intersection of the second segment and the third segment, the depth of the second segment is less than the depth of the third segment.

[0014] Optionally, at the intersection of the third segment and the fourth segment, the depth of the third segment is less than the depth of the fourth segment.

[0015] Optionally, at the intersection of the fourth segment and the first segment, the depth of the fourth segment is less than the depth of the first segment.

[0016] Optionally, the pull rod includes a pull rod body, a first bent portion, and a second bent portion. The pull rod body extends along the second direction. The first bent portion and the second bent portion are respectively connected to both ends of the pull rod body, and the bending directions of the first bent portion and the second bent portion are the same. The first bent portion is rotatably connected to the second end of the aiming seat, and the second bent portion is disposed in the guide groove to form the sliding end.

[0017] Optionally, the elastic element extends along the second direction, and one end of the elastic element is connected to the first end of the aiming mount, such that when the slider moves along the direction from the first end to the second end, the elastic element is stretched and stores elastic potential energy.

[0018] Optionally, the elastic element extends along the second direction, and one end of the elastic element is connected to the second end of the aiming mount, such that when the slider moves along the direction from the first end to the second end, the elastic element is compressed and stores elastic potential energy.

[0019] Optionally, the loading mechanism is provided with a first locking part, which is a locking groove. The slider is provided with a U-shaped groove on the side near the second end. The U-shaped groove has a first side, a second side and a third side connected in sequence. The first side and the third side are arranged opposite to each other and are parallel to each other. The first side is also parallel to the first direction and the second direction. The second locking part is a locking protrusion connected to the second side.

[0020] Optionally, the locking mechanism is provided with a first identifier and a second identifier, and the loading mechanism is provided with a third identifier and a fourth identifier; when the third identifier and the first identifier satisfy a first predetermined relationship, and the fourth identifier and the second identifier satisfy a second predetermined relationship, the loading mechanism is in the predetermined position.

[0021] Optionally, the locking mechanism is disposed on the distal end face of the aiming mount; the locking mechanism further includes a cover plate, the cover plate covers the guide groove and restricts the sliding end of the pull rod within the guide groove; the distal end face of the cover plate is the first marking position, and the cover plate also has a fourth side surface, the fourth side surface is parallel to both the first direction and the second direction, and the fourth side surface constitutes the second marking position;

[0022] The loading mechanism includes an upper nailer and a tightening bolt. The upper nailer has an axially extending upper nail channel. The tightening bolt partially passes through the upper nail channel, with its proximal end extending out of the upper nail channel. The outer circumferential surface of the proximal end of the tightening bolt has an external thread. The proximal end face of the upper nailer has an axially extending positioning protrusion. The outer circumferential surface of the upper nailer has a circumferentially arranged marking groove, and the marking groove has a zero-position marking as the third marking position. A portion of the outer circumferential surface of the upper nailer is also formed as a marking plane, which is parallel to the outer surface of the positioning protrusion. The marking plane constitutes the fourth marking position.

[0023] The first predetermined relationship means that the third identifier bit is aligned with the first identifier bit, and the second predetermined relationship means that the fourth identifier bit is parallel to the second identifier bit.

[0024] Compared with the prior art, the aiming device of the present invention has the following advantages:

[0025] The aforementioned aiming device includes a loading mechanism, an aiming mount, and a locking mechanism; wherein, the loading mechanism is used to load a target; the aiming mount is provided with an aiming channel for the loading mechanism to pass through; the locking mechanism is disposed on the aiming mount, and the locking mechanism selectively engages or disengages with the loading mechanism; the aiming device is configured such that when the loading mechanism is partially passed through the aiming channel and the loading mechanism is in a predetermined position, the locking mechanism can engage with the loading mechanism and lock the loading mechanism on the aiming mount to prevent the loading mechanism from moving relative to the aiming mount; when the locking mechanism is disengaged from the loading mechanism, the loading mechanism is allowed to move relative to the aiming mount. The target object is, for example, the traction screw of an intramedullary nail assembly. When the loading mechanism loads the traction screw, the traction screw is inserted into the medullary cavity and passes through the second screw hole on the main nail, and the loading mechanism is in the predetermined position, the axis of the fourth screw hole on the traction screw can be made to coincide with the axis of the first screw hole on the main nail. At this time, controlling the locking mechanism to connect with the loading mechanism can lock the loading mechanism in the predetermined position, so that the axis of the fourth screw hole and the axis of the first screw hole remain coincident. Thus, the upper lock can accurately pass through the first screw hole of the main nail and the fourth screw hole of the traction screw, which is accurate and convenient to use.

[0026] Furthermore, the locking mechanism is provided with a first and a second identifier, and the loading mechanism is provided with a third and a fourth identifier. When the third identifier and the first identifier satisfy a first predetermined relationship, and the fourth identifier is located between the second identifier and satisfy a second predetermined relationship, the loading mechanism is in the predetermined position. Both the locking mechanism and the loading mechanism are located outside the body, thus the first, second, third, and fourth identifiers are all located outside the body. The surgeon can determine whether the first identifier and the third identifier satisfy the first predetermined condition, and whether the second identifier located between the fourth identifier and the first identifier satisfies the second predetermined condition, without the need for X-ray fluoroscopy, thereby eliminating radiation damage to both the doctor and patient caused by X-rays. Attached Figure Description

[0027] The accompanying drawings are provided to better understand the invention and are not intended to unduly limit the scope of the invention. Wherein:

[0028] Figure 1This is a schematic diagram illustrating the application scenarios of intramedullary nail components in existing technologies;

[0029] Figure 2 This is a schematic diagram of the proximal end of the main nail in an intramedullary nail assembly in the prior art;

[0030] Figure 3 This is a schematic diagram of the tension screw in an intramedullary nail assembly in the prior art;

[0031] Figure 4 This is a schematic diagram of the aiming device provided by the present invention according to an embodiment;

[0032] Figure 5 This is a schematic diagram illustrating an application scenario of the aiming device provided by the present invention according to an embodiment;

[0033] Figure 6 yes Figure 4 An explosion diagram of the aiming device is shown;

[0034] Figure 7 This is a partial structural schematic diagram of the loading mechanism of the aiming device provided according to an embodiment of the present invention, showing the nailer;

[0035] Figure 8 This is a partial structural schematic diagram of the aiming device mechanism provided by the present invention according to an embodiment, showing the lifting bolt.

[0036] Figure 9 This is a partial explosion diagram of the aiming device provided by the present invention according to an embodiment;

[0037] Figure 10 This is a schematic diagram of the aiming mount body of the aiming device according to an embodiment of the present invention;

[0038] Figure 11 This is a schematic diagram of the upper nail sleeve of the aiming device provided according to an embodiment of the present invention;

[0039] Figure 12 This is a schematic diagram of the upper nail sleeve of the aiming device according to an embodiment of the present invention. Figure 11 and Figure 12 The observation directions are different;

[0040] Figure 13 This is a partial structural schematic diagram of the locking mechanism of the aiming device provided according to an embodiment of the present invention;

[0041] Figure 14 yes Figure 13 A partially enlarged schematic diagram of the locking mechanism of the aiming device shown;

[0042] Figure 15This is a schematic diagram of the elastic element of the locking mechanism of the aiming device according to an embodiment of the present invention;

[0043] Figure 16 This is a schematic diagram of the pull rod of the locking mechanism of the aiming device according to an embodiment of the present invention;

[0044] Figure 17 This is a schematic diagram of the assembly relationship between the locking mechanism and the aiming base body of the aiming device according to an embodiment of the present invention. The elastic element in the figure is not stretched.

[0045] Figure 18 This is a schematic diagram of the assembly relationship between the locking mechanism and the aiming base body of the aiming device according to an embodiment of the present invention. In the figure, the elastic element is stretched and stores elastic potential energy.

[0046] Figure 19 This is a schematic diagram of the cover plate of the locking mechanism of the aiming device according to an embodiment of the present invention;

[0047] Figure 20 This is a partial cross-sectional view of the aiming device provided by the present invention according to an alternative embodiment;

[0048] Figure 21 This is a partial structural schematic diagram of the aiming device provided by the present invention according to an alternative embodiment.

[0049] [The annotations in the attached figures are explained below]:

[0050] 100-Loading mechanism, 101-Third marking position, 102-Fourth marking position, 103-First locking part, 110-Hooker, 111-Hooker channel, 112-Positioning protrusion, 113-Marking groove, 120-Hanging bolt, 121-External thread;

[0051] 200-Sight mount, 210-Sight mount body, 211-First through hole, 212-First boss, 213-First limiting plane, 214-Guide groove, 215-First pin, 216-First connecting hole, 220-Upper pin sleeve, 221-Second through hole, 222-Second boss, 223-Step surface, 224-Second limiting plane;

[0052] 300-Locking mechanism, 310-Slider, 310a-Operating part, 310b-Wing-shaped part, 311-Guide groove, 311a-First segment, 311b-Second segment, 311c-Third segment, 311d-Fourth segment, 312-Positioning surface, 313-Second pin, 320-Pull rod, 321-Pull rod body, 322-First bending part, 323-Second bending part, 330-Elastic element, 331-First connecting ring, 332-Second connecting ring, 340-Second locking part, 350-Cover plate, 301-First marking position, 302-Second marking position;

[0053] 10-Main screw, 11-First screw hole, 12-Second screw hole, 13-Third screw hole, 20-Pull screw, 21-Fourth screw hole, 22-Internal threaded hole, 23-Positioning groove, 30-Upper locking screw, 40-Lower locking screw, 50-Handle. Detailed Implementation

[0054] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show components related to the present invention and are not drawn according to the actual number, shape, and size of components in the actual implementation. In the actual implementation, the type, quantity, and proportion of each component can be arbitrarily changed, and the component layout may also be more complex.

[0055] Furthermore, while each embodiment described below possesses one or more technical features, this does not imply that users of the present invention must simultaneously implement all technical features in any embodiment, or can only separately implement some or all technical features in different embodiments. In other words, provided it is feasible, those skilled in the art can, based on the disclosure of the present invention and depending on design specifications or implementation requirements, selectively implement some or all technical features in any embodiment, or selectively implement a combination of some or all technical features in multiple embodiments, thereby increasing the flexibility in implementing the present invention.

[0056] As used herein, the singular forms “a,” “an,” and “the” include plural objects, and the plural form “a plurality” includes two or more objects, unless otherwise expressly indicated. As used herein, the term “or” is generally used to include the meaning of “and / or,” unless otherwise expressly indicated, and the terms “install,” “connect,” and “link” should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection. Connections can be mechanical or electrical. Connections can be direct or indirect through an intermediate medium, and can represent internal communication between two elements or an interaction between two elements. Those skilled in the art will understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0057] In this article, the terms "proximal" and "distal" refer to the relative orientation, position, and direction of components or movements relative to each other from the perspective of a physician using a medical device. Although "proximal" and "distal" are not restrictive, "proximal" usually refers to the end of the medical device that is closer to the patient during normal operation, while "distal" refers to the end that is farther away from the patient.

[0058] To make the objectives, advantages, and features of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clearly illustrate the objectives of the embodiments of the present invention. The same or similar reference numerals in the drawings represent the same or similar parts.

[0059] Figure 4 This is a schematic diagram of the aiming device provided according to an embodiment of the present invention. Figure 9 This is a partial explosion diagram of the aiming device. (See diagram below.) Figure 4 and Figure 9As shown, the aiming device includes a loading mechanism 100, an aiming base 200, and a locking mechanism 300. The loading mechanism 100 is used to load a target. The aiming base 200 has an aiming channel (not shown) through which the loading mechanism 100 passes. The locking mechanism 300 is disposed on the aiming base 200 and is selectively connected to or disconnected from the loading mechanism 100. The aiming device is configured such that when the loading mechanism 100 is partially inserted into the aiming channel and is in a predetermined position, the locking mechanism 300 can connect to the loading mechanism 100 and lock it onto the aiming base 200, preventing movement of the loading mechanism 100 relative to the aiming base 200. When the locking mechanism 300 is disconnected from the loading mechanism 100, movement of the loading mechanism 100 relative to the aiming base 200 is permitted.

[0060] The aiming device can be applied to, for example, Figure 1 In the surgical treatment of fractures using the intramedullary nail assembly shown, the target object refers to the lag screw 20. When the loading mechanism 100 is in the predetermined position, the lag screw 20 mounted on the loading mechanism 100 passes through the second nail hole 12 of the master nail 10, and the fourth nail hole 21 coincides with the axis of the first nail hole 11.

[0061] At work, such as Figure 5 As shown, when the main nail 10 of the intramedullary nail assembly is inserted into the medullary cavity, the aiming seat 200 is connected to the proximal end of the main nail 10 via an external mechanism, such as a handle 50, and remains relatively fixed. Then, the loading mechanism 100 is used to load the tension screw 20, and the loading mechanism 100 is partially inserted into the aiming channel, after which the loading mechanism 100 is positioned in the predetermined position. Next, the loading mechanism 100 is locked onto the aiming seat 200 by the locking mechanism 300, so that the loading mechanism 100 and the aiming seat 200 are fixed, thereby fixing the tension screw 20 and the main nail 10, with the axis of the fourth nail hole 21 coinciding with the axis of the first nail hole 11. Finally, the locking screw 30 is inserted into the medullary cavity, and the locking screw 30 passes sequentially through the first nail hole 11 and the fourth nail hole 21. In other words, by using the locking mechanism 300 to lock the position of the loading mechanism 100 in the predetermined posture, the tension screw 20 can be kept in the appropriate position in the medullary cavity, so as to ensure that the fourth nail hole 21 of the tension screw 20 is coaxial with the first nail hole 11 of the main nail 10, thereby quickly and smoothly inserting the locking nail 30. It has the advantages of being simple and convenient to use, and having accurate and stable aiming.

[0062] like Figure 6 As shown, the locking mechanism 300 is provided with a first identifier 301 and a second identifier 302. Figure 9 As shown, the loading mechanism 100 is provided with a third identifier 101 and a fourth identifier 102. When the third identifier 101 and the first identifier 301 satisfy a first predetermined relationship, and the fourth identifier 102 and the second identifier 302 satisfy a second predetermined relationship, the loading mechanism 100 is in the predetermined position. Both the locking mechanism 300 and the loading mechanism 100 are located outside the body, thus the first identifier 301, the second identifier 302, the third identifier 101, and the fourth identifier 102 are also located outside the body. The surgeon can determine whether the first identifier 301 and the third identifier 101 satisfy the first predetermined condition, and whether the second identifier 302 and the fourth identifier 102 satisfy the second predetermined condition, without the need for X-ray fluoroscopy, thereby eliminating radiation damage to both the doctor and the patient.

[0063] The specific structure and cooperation of the aiming device will be described in detail below. However, those skilled in the art should understand that the following description is merely a preferred structure of the aiming device, not the only structure, and therefore should not be construed as an undue limitation on the present invention.

[0064] Please refer to Figure 4 and combined Figure 7 and Figure 8 The loading mechanism 100 includes a nailer 110 and a tightening bolt 120. The nailer 110 has a nailing channel 111 extending axially through it, and a positioning protrusion 112 extending axially is provided on the proximal end face of the nailer 110. The tightening bolt 120 partially passes through the nailing channel 111, and the proximal end of the tightening bolt 120 extends out of the nailing channel 111. An external thread 121 is provided on the proximal outer circumferential surface of the tightening bolt 120.

[0065] Please return to the reference. Figure 3 The tension screw 20 has an internal threaded hole 22 on its distal end face, and a positioning groove 23 is also provided on the distal outer circumferential surface of the tension screw 20. When the proximal end of the tightening bolt 120 is inserted into the internal threaded hole 22 and threadedly connected thereto, and the positioning protrusion 112 of the nailer 110 is inserted into the positioning groove 23, the loading mechanism 100 loads the tension screw 20.

[0066] Preferably, there are two positioning grooves 23, which are arranged symmetrically around the axis of the tension screw 20. Correspondingly, there are also two positioning protrusions 112, which are arranged symmetrically around the axis of the nailer 110.

[0067] The outer peripheral surface of the stapler 110 is provided with a marking groove 113 arranged circumferentially thereon, and the marking groove 113 is provided with a zero mark as the third marking position 101. A portion of the outer peripheral surface of the stapler 110 is formed as a marking plane as the fourth marking position 102, and the marking plane is parallel to the outer surface of the positioning protrusion 112 (i.e., the portion of the surface of the positioning protrusion 112 away from the axis of the stapler 110). The number of marking planes can be one, so that one fourth marking position 102 is formed on the stapler 110. In addition, the outer peripheral surface of the stapler 110 is also provided with a first locking part 103, which is, for example, a locking groove.

[0068] Please continue to refer to this. Figure 4 and combined Figure 6 The aiming mount 200 may include an aiming mount body 210 and an upper nail sleeve 220. The aiming mount body 210 has a first through hole 211 extending through a first direction, such that... Figure 4 and Figure 6 As shown by the double-headed arrow A, the upper nail sleeve 220 partially passes through the first through hole 211, with its proximal end extending out of the first through hole 211. The upper nail sleeve 220 remains relatively stationary with respect to the aiming mount body 210. The upper nail sleeve 220 also has a second through hole 221 extending through along the first direction, which constitutes the aiming channel.

[0069] Please refer to Figure 9 and Figure 10 The aiming mount body 210 has two first protrusions 212 protruding distally on its distal end face. Each first protrusion 212 extends along a second direction, and the two first protrusions 212 are arranged along a third direction on opposite sides of the first through hole 211. The second direction is perpendicular to the first direction. Figure 9 and Figure 10 As shown by the bidirectional arrow B in the diagram. The third direction is perpendicular to both the first direction and the second direction, as shown in the diagram. Figure 9 and Figure 10 As shown by the double-headed arrow C in the diagram. The inner surfaces of the two first protrusions 212 respectively form two first limiting planes 213. The inner surfaces refer to the opposite portions of the surfaces of the two first protrusions 212, which are parallel to the first direction and the second direction.

[0070] Please refer to Figure 11 and Figure 12The distal end of the upper nail sleeve 220 has an annular second protrusion 222 extending radially outward. The proximal end face of the second protrusion 222 forms a stepped surface 223. Two opposing second limiting planes 224 are also formed on the second protrusion 222. When the upper nail sleeve 220 is partially inserted into the first through hole 211, the two second limiting planes 224 of the second protrusion 222 abut against the two first limiting planes 213, respectively, so that the upper nail sleeve 220 and the aiming mount body 210 remain circumferentially stationary. Simultaneously, the stepped surface 223 of the second protrusion 222 also presses against the distal end face of the aiming mount body 210. In this embodiment, please refer to... Figure 9 , Figure 17 and Figure 18 The locking mechanism 300 is actually disposed on the aiming mount body 210, specifically on the first protrusion 212. Furthermore, the locking mechanism 300 presses against the distal end face of the second protrusion 222, so that the upper nail sleeve 220 and the aiming mount body 210 remain axially relatively stationary.

[0071] Please refer to this again for more details. Figure 9The locking mechanism 300 includes a slider 310, a pull rod 320, an elastic element 330, and a second locking part 340. Specifically, the aiming base 200 has a aiming base body 210 having a first end 210a and a second end 210b opposite to each other in the second direction. The slider 310 is disposed on the aiming base body 210 and can be located on the side of the aiming channel closer to the first end 210a. The slider 310 is capable of reciprocating linear motion in the second direction (i.e., moving on the aiming base body 210 from the first end 210a to the second end 210b, and moving from the second end 210b to the first end 210a). The slider 310 is also provided with a guide groove 311, and the guide groove 311 has a first position (not shown in the figure). One end of the pull rod 320 is disposed on the aiming base body 210, and the other end of the pull rod 320 is a sliding end disposed within the guide groove 311. When the slider 310 moves along the second direction, the sliding end of the pull rod 320 can move within the guide groove 311. One end of the elastic element 330 is disposed on the aiming base body 210, and the other end is disposed on the slider 310. The second locking part 340 is disposed on the slider 310. The second locking part 340 may be a locking protrusion that matches the locking groove and is disposed on the end of the slider 310 facing the aiming channel, that is, the locking protrusion is disposed on the end of the slider 310 near the second end 210b. Preferably, a U-shaped groove is provided on the side of the slider 310 near the second end 210b. The U-shaped groove has a first side surface, a second side surface, and a third side surface connected in sequence, wherein the first side surface and the second side surface are parallel to the first direction and the second direction, respectively. The second locking part 340 is a locking protrusion connected to the second side surface. One of the first side and the second side forms the positioning surface 312, and the other side can also be connected to the locking protrusion.

[0072] It is understood that when the loading mechanism 100 partially passes through the aiming through hole 201 and is in the predetermined position, the locking groove is arranged toward the slider 310 so that the locking protrusion can be inserted into the locking groove, and the positioning surface 312 is used to contact the marking plane.

[0073] The aiming device is configured such that when the slider 310 moves on the aiming base body 210 to make the sliding end of the pull rod 320 reach the first position, the sliding end of the pull rod 320 stops moving, the elastic element 330 stores elastic potential energy, and the locking protrusion is stably inserted in the locking groove so that the second locking part 340 is connected to the first locking part 103; when the slider 310 moves under the action of an external force to make the sliding end of the pull rod 320 disengage from the first position, the external force is canceled, and the elastic element 330 releases elastic potential energy to drive the slider 310 to move to the point where the second locking part 340 is disengaged from the first locking part 103.

[0074] For more details, please refer to [link / reference]. Figure 9 and Figure 10 The distal end face of the first protrusion 212 is provided with a guide groove 214 extending in the second direction. Furthermore, the distal end face of the first protrusion 212 is also provided with a first pin 215 and a first connecting hole 216. The first pin 215 and the first connecting hole 216 are respectively located on opposite sides of the guide groove 214 in the second direction; that is, the first pin 215 can be located on the first end of the aiming mount body 210, and the first connecting hole 216 can be located on the second end of the aiming mount body 210.

[0075] Please continue to refer to this. Figure 9 and combined with 14 and Figure 18 The slider 310 includes an operating part 310a and two wing-shaped parts 310b, which are symmetrically arranged on opposite sides of the operating part 310a in the third direction. The proximal end of each wing-shaped part 310b inserts into the guide groove 214 and can slide along the guide groove 214, allowing the slider 310 to perform reciprocating linear motion in the second direction. Each wing-shaped part 310b is provided with a guide groove 311 to make the movement of the slider 310 more stable and smooth. Additionally, a second pin 313 is provided on the end of each wing-shaped part 310b near the first end.

[0076] Please refer to this carefully. Figure 13 and Figure 14The guide groove 311 at least partially forms an annular structure, and the annular structure has the first position. Furthermore, the annular structure also has a second position (not shown in the figure) and a third position (not shown in the figure), arranged sequentially. The first position is located on the side of the second and third positions closer to the second end 210b of the aiming mount 200 (or the aiming mount body 210). The groove walls of the second and third positions abut against the sliding end of the pull rod 320 to prevent the slider 310 from moving from the first end to the second end under the action of external force. The groove wall of the first position abuts against the sliding end of the pull rod 320 to prevent the elastic element 330 from releasing its elastic potential energy.

[0077] In this embodiment, the guide groove 311 first extends from the second end 210b to the first end 210a, forming a first segment 311a. Then, the guide groove 311 bends for the first time and extends from the first end 210a to the second end 210b, forming a second segment 311b. Next, the guide groove 311 bends for the second time and extends from the second end 210b to the first end 210a, forming a third segment 311c. Then, the guide groove 311 bends for the third time and extends from the first end 210a to the second end 210b, forming a fourth segment 311d. The end of the fourth segment 311d away from the third segment 311c communicates with the first segment 311a, so that at least a portion of the guide groove 311 forms an annular structure. That is, the guide groove 311 includes a first segment 311a, a second segment 311b, a third segment 311c, and a fourth segment 311d. The second segment 311b is connected to the first segment 311a at an angle, forming a first corner with an opening facing the second end 210b. The third segment 311c is connected to the second segment 311b at an angle, forming a second corner with an opening facing the first end 210a. The fourth segment 311d is connected to the third segment 311c at an angle, forming a third corner with an opening facing the second end 210b. The end of the second segment 311b closest to the first segment 311a constitutes the second position, the end of the third segment 311c closest to the second segment 311b constitutes the first position, and the end of the fourth segment 311d closest to the third segment 311c constitutes the third position.

[0078] It should be noted that the extension of the guide groove 311 from the first end 210a to the second end 210b to form the first segment 311a does not mean that the first segment 311a must be a straight groove segment parallel to the second direction. It only indicates that the first segment 311a has two opposite ends in the second direction. The first segment 311a can be a curved groove segment or a straight groove segment perpendicular to the first direction. Similarly, any one of the second segment 311b, the third segment 311c, and the fourth segment 311d can be a curved groove segment or a straight groove segment perpendicular to the second direction. In other words, as long as any one of the first segment 311a, the second segment 311b, the third segment 311c, and the fourth segment 311d is not a straight groove segment perpendicular to the second direction, it is acceptable.

[0079] Please refer to this again. Figure 15 and combined Figure 17 and Figure 18 The elastic element 330 is a spring and extends along the second direction. A first connecting ring 331 is provided at one end of the elastic element 330, and a second connecting ring 332 is provided at the other end of the elastic element 330. The first connecting ring 331 is connected to the first pin 215, and the second connecting ring 332 is connected to the second pin 313.

[0080] Please refer to this again. Figure 16 and combined Figure 17 and Figure 18 The pull rod 320 includes a pull rod body 321, a first bent portion 322, and a second bent portion 323. The pull rod body 321 extends along the second direction, and the bending directions of the first bent portion 322 and the second bent portion 323 are the same. The first bent portion 322 serves as one end of the pull rod 320 and is inserted into the first connecting hole 217 on the aiming mount body 210, thereby rotatably connecting one end of the pull rod 320 to the second end 210b of the aiming mount body 210. The second bent portion 323 serves as the other end of the pull rod 320, i.e., the sliding end, and is disposed in the guide groove 311. In addition, to facilitate the insertion of the first bent portion 322 into the first connecting hole 217, in this embodiment, it is preferable that the length of the first bent portion 322 is greater than the length of the second bent portion 323.

[0081] Thus, when the loading mechanism 100 is partially inserted into the aiming channel and is in the predetermined position, the user first applies an external force to the slider 310, causing the slider 310 to move along the first end 210a to the second end 210b, and the elastic member 330 is stretched and stores elastic potential energy. Simultaneously, the sliding end of the pull rod 320 moves within the first segment 311a of the guide groove 311 along the second end 210b to the first end 210a until it enters the second position of the second segment 311b, and the locking protrusion is inserted into the locking groove, with the positioning surface 312 contacting the marking plane. At this time, the groove wall at the second position abuts against the sliding end of the pull rod 320, hindering the movement of the sliding end of the pull rod 320 along the first end to the second end, and also hindering the movement of the slider 310 along the first end 210a to the second end 210b. Then, the user stops applying external force to the slider 310 and causes the elastic element 330 to release its elastic potential energy, driving the slider 310 to move along the second end 210b toward the first end 210a. At the same time, the sliding end of the pull rod 320 moves along the first end 210a toward the second end 210b in the second segment 311b until it enters the third segment 311c and reaches the first position. At this time, the locking protrusion is still partially inserted in the locking groove. Since the groove wall at the first position abuts against the sliding end of the pull rod 320, this prevents the elastic element 330 from continuing to release elastic potential energy, and hinders the movement of the sliding end of the pull rod 320 along the direction from the first end 210a to the second end 210b and the movement of the slider 310 along the direction from the second end 210b to the first end 210a, so that the slider 310 remains stationary on the aiming body 210, thereby allowing the locking protrusion to be stably inserted into the locking groove, that is, the second locking part 340 and the first locking part 103 remain connected.

[0082] When it is necessary to disengage the locking mechanism 300 from the loading mechanism 100, the user applies external force to the slider 310 again, causing the slider 310 to move from the first end 210a to the second end 210b. This causes the sliding end of the pull rod 320 to move from the second end 210b to the first end 210a within the third segment 311c of the guide groove 311, until it enters the fourth segment 311d and reaches the third position. During this process, the elastic element 330 is stretched again and stores elastic potential energy. Then, the user stops applying external force to the slider 310, causing the elastic element 330 to release its elastic potential energy again, and driving the slider 310 to move from the second end 210b to the first end 210a, thereby causing the locking protrusion to disengage from the locking groove and disconnect from the loading mechanism 100. At the same time, the sliding end of the pull rod 320 moves along the direction from the first end 210a to the second end 210b within the fourth segment 311d and returns to the first segment 311a.

[0083] To facilitate the smooth movement of the sliding end of the pull rod 320 along the first segment 311a and into the second segment 311b, in this embodiment, it is preferable that at the intersection of the first segment 311a and the second segment 311b, the depth of the first segment 311a is less than the depth of the second segment 311b, so that a first step is formed at the intersection of the first segment 311a and the second segment 311b. Similarly, to facilitate the smooth movement of the sliding end of the pull rod 320 into the third segment 311c and into the fourth segment 311d and back to the first segment 311a, it is preferable that at the intersection of the second segment 311b and the third segment 311c, the depth of the second segment 311b is less than the depth of the third segment 311c, so that a second step is formed at the intersection of the second segment 311b and the third segment 311c. At the intersection of the third segment 311c and the fourth segment 311d, the depth of the third segment 311c is less than the depth of the fourth segment 311d, such that the intersection of the fourth segment 311d and the third segment 311c forms a third step. Similarly, at the intersection of the fourth segment 311d and the first segment 311a, the depth of the fourth segment 311d is less than the depth of the first segment 311a, such that the intersection of the fourth segment 311d and the first segment 311a forms a fourth step. The height of each step can be 0.1mm to 0.5mm.

[0084] In this embodiment, the depth of at least a portion of the first segment 311a, for example, the region near the second segment 311b, gradually decreases along the direction from the second end 210b toward the first end 210a. The second segment 311b may have a uniform depth. The depth of at least a portion of the third segment 311c, for example, the region near the fourth segment 311d, gradually decreases along the direction from the second end 210b toward the first end 210a. The depth of at least a portion of the fourth segment 311d, for example, the region near the first segment 311a, gradually decreases along the direction from the first end 210a toward the second end 210b.

[0085] Please refer to Figure 20 and Figure 21 In an alternative embodiment, one end of the elastic element 330 is connected to the second end 210b of the aiming mount body 210. In this way, when the slider 310 moves along the first end 210a toward the second end 210b on the aiming mount body 210, the elastic element 330 is compressed and stores elastic potential energy.

[0086] Please return to the reference. Figure 9 and combined Figure 19 The locking mechanism 300 further includes a cover plate 350. There are two cover plates 350. Each cover plate 350 is disposed on the distal end face of one of the wing-shaped portions 310b and covers one of the guide grooves 311 to restrict the sliding end of the pull rod 320 within the corresponding guide groove 311 and prevent the sliding end of the pull rod 320 from coming out of the guide groove 311.

[0087] Optionally, the cover plate 350 is provided with a first identifier 301 and a second identifier 302. Specifically, as shown in the figure... Figure 9 and Figure 19 As shown, the cover plate 350 has a distal end face and a fourth side face. The fourth side face is parallel to the first direction and the second direction, and perpendicular to the third direction. In this embodiment, the distal end face of the cover plate 350 is used as the first identifier 301, and the fourth side face is used as the second identifier 302. The first predetermined relationship means that the first identifier 301 is aligned with the third identifier 101, and the second predetermined relationship means that the second identifier 302 is parallel to the fourth identifier 102.

[0088] While the present invention has been disclosed above, it is not limited thereto. Those skilled in the art can make various modifications and variations to the present invention without departing from its spirit and scope. Therefore, if such modifications and variations fall within the scope of the claims and their equivalents, the present invention also intends to include such modifications and variations.

Claims

1. An aiming device for assembling a main nail and a traction screw of an intramedullary nail assembly, wherein the main nail has a first nail hole and a second nail hole, the axis of the first nail hole being inclined relative to the axis of the traction screw, and the traction screw has a fourth nail hole, the axis of the fourth nail hole being inclined relative to the axis of the traction screw; characterized in that, It includes a loading mechanism, a aiming mount, and a locking mechanism; wherein, the loading mechanism is used to load a target object, the target object being the tension screw; the aiming mount is provided with an aiming channel for the loading mechanism to pass through; the locking mechanism is disposed on the aiming mount and selectively connects to or disconnects from the loading mechanism; The aiming device is configured such that when the loading mechanism partially passes through the aiming channel and the loading mechanism is in a predetermined position, the locking mechanism can engage with the loading mechanism and lock the loading mechanism onto the aiming mount to prevent the loading mechanism from moving relative to the aiming mount; when the locking mechanism is disengaged from the loading mechanism, the loading mechanism is allowed to move relative to the aiming mount. The locking mechanism is provided with a first identifier and a second identifier, and the loading mechanism is provided with a third identifier and a fourth identifier. When the third identifier and the first identifier satisfy a first predetermined relationship, and the fourth identifier and the second identifier satisfy a second predetermined relationship, the loading mechanism is in the predetermined position. The first predetermined relationship means that the third identifier is aligned with the first identifier, and the second predetermined relationship means that the fourth identifier is parallel to the second identifier. When the aiming mount is connected to the proximal end of the main nail via a handle, the loading mechanism is in the predetermined position, and the locking mechanism is connected to the loading mechanism, the tension screw mounted on the loading mechanism can pass through the second nail hole of the main nail, and make the axis of the fourth nail hole coincide with the axis of the first nail hole.

2. The aiming device according to claim 1, characterized in that, The locking mechanism includes a slider, a pull rod, an elastic element, and a second locking part; the slider is movably mounted on the aiming base, and a guide groove is provided on the slider, with a first position within the guide groove; one end of the pull rod is connected to the aiming base, and the other end is a sliding end, which is disposed within the guide groove and can move within the guide groove as the slider moves; one end of the elastic element is connected to the aiming base, and the other end is connected to the slider; the second locking part is disposed at the end of the slider facing the aiming channel. The aiming device is configured such that when the slider moves on the aiming base to bring the sliding end of the lever to the first position, the sliding end stops sliding, the elastic element stores elastic potential energy, and the second locking part is connected to the loading mechanism; when the slider moves to disengage the sliding end of the lever from the first position and the elastic element releases elastic potential energy, the slider drives the second locking part to move away from the aiming channel, thereby disengaging the second locking part from the loading mechanism.

3. The aiming device according to claim 2, characterized in that, The aiming channel extends through the aiming base in a first direction, and the aiming base has a first end and a second end opposite each other in a second direction, the second direction being perpendicular to the first direction; the slider is disposed on the side of the aiming channel near the first end, and the guide groove is at least partially formed into an annular structure, within which a second position, a first position, and a third position are sequentially provided, the first position being located on the side of the second position and the third position near the second end; the groove walls of the second position and the third position abut against the sliding end of the pull rod to prevent the slider from moving along the direction from the first end to the second end, and the groove wall of the first position abuts against the sliding end of the pull rod to prevent the elastic element from releasing elastic potential energy; The aiming device is configured such that when the slider moves from the first end to the second end under the action of an external force, the sliding end of the lever moves from the second end to the first end, and the elastic element stores elastic potential energy; when the elastic element at least partially releases the elastic potential energy, the slider moves from the second end to the first end, and the sliding end of the lever moves from the first end to the second end.

4. The aiming device according to claim 3, characterized in that, The guide groove includes a first segment, a second segment, a third segment, and a fourth segment; the second segment is connected to the first segment at an angle and forms a first corner with an opening facing the second end, and the end of the second segment closer to the first segment constitutes the second position; the third segment is connected to the second segment at an angle and forms a second corner with an opening facing the first end, and the end of the third segment closer to the second segment constitutes the first position; the fourth segment is connected to the third segment at an angle and forms a third corner with an opening facing the second end, and the end of the fourth segment closer to the third segment constitutes the third position; the end of the fourth segment away from the third segment communicates with the first segment so that the guide groove at least partially forms the annular structure.

5. The aiming device according to claim 4, characterized in that, At the intersection of the first segment and the second segment, the depth of the first segment is less than the depth of the second segment.

6. The aiming device according to claim 4, characterized in that, At the intersection of the second segment and the third segment, the depth of the second segment is less than the depth of the third segment.

7. The aiming device according to claim 4, characterized in that, At the intersection of the third segment and the fourth segment, the depth of the third segment is less than the depth of the fourth segment.

8. The aiming device according to claim 4, characterized in that, At the intersection of the fourth segment and the first segment, the depth of the fourth segment is less than the depth of the first segment.

9. The aiming device according to claim 3, characterized in that, The pull rod includes a pull rod body, a first bent portion, and a second bent portion. The pull rod body extends along the second direction. The first bent portion and the second bent portion are respectively connected to both ends of the pull rod body, and the bending directions of the first bent portion and the second bent portion are the same. The first bent portion is rotatably connected to the second end of the aiming mount, and the second bent portion is disposed in the guide groove to form the sliding end.

10. The aiming device according to claim 3, characterized in that, The elastic element extends along the second direction, and one end of the elastic element is connected to the first end of the aiming mount, such that when the slider moves along the direction from the first end to the second end, the elastic element is stretched and stores elastic potential energy.

11. The aiming device according to claim 3, characterized in that, The elastic element extends along the second direction, and one end of the elastic element is connected to the second end of the aiming mount, such that when the slider moves along the direction from the first end to the second end, the elastic element is compressed and stores elastic potential energy.

12. The aiming device according to claim 3, characterized in that, The loading mechanism is provided with a first locking part, which is a locking groove. The slider is provided with a U-shaped groove on the side near the second end. The U-shaped groove has a first side, a second side and a third side connected in sequence. The first side and the third side are arranged opposite to each other and are parallel to each other. The first side is also parallel to the first direction and the second direction. The second locking part is a locking protrusion connected to the second side.

13. The aiming device according to claim 3, characterized in that, The locking mechanism is disposed on the distal end face of the aiming mount; the locking mechanism further includes a cover plate, which covers the guide groove and restricts the sliding end of the pull rod within the guide groove; the distal end face of the cover plate is the first marking position, and the cover plate also has a fourth side surface, which is parallel to both the first direction and the second direction, and the fourth side surface constitutes the second marking position; The loading mechanism includes a nailer and a tightening bolt. The nailer has an axially extending nailing channel, and the tightening bolt partially passes through the nailing channel, with its proximal end extending out of the nailing channel. The outer circumferential surface of the proximal end of the tightening bolt has an external thread, and the proximal end face of the nailer has an axially extending positioning protrusion. The outer circumferential surface of the nailer has a circumferentially arranged marking groove, and the marking groove has a zero-position marking as the third marking position. A portion of the outer circumferential surface of the nailer is also formed as a marking plane, which is parallel to the outer surface of the positioning protrusion, and the marking plane constitutes the fourth marking position.

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