Intramedullary nail lag screw drill guide

Abstract

The application discloses an intramedullary nail tension screw drilling guide device, and belongs to the technical field of medical devices.The intramedullary nail tension screw drilling guide device comprises a sighting arm, one end of the sighting arm is used for detachably connecting the upper end of an intramedullary nail main nail, the other end is provided with a tension screw guide hole, a guide sleeve is coaxially arranged in the tension screw guide hole, the sighting arm is provided with a limiting button at the tension screw guide hole, the limiting button has a locking state and an unlocking state, in the locking state, the guide sleeve is locked in the tension screw guide hole, and in the unlocking state, the guide sleeve is slidably connected in the tension screw guide hole.The intramedullary nail tension screw drilling guide device has the advantages of small space occupation, simple and convenient operation, easy control of pressing force, accurate drilling guide positioning, accurate bottom hole position, accurate oblique tension screw implantation position and good intramedullary nail stability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a drill guide for a lag screw of an intramedullary nail. BACKGROUND

[0002] In the process of inserting a lag screw in a proximal femoral intramedullary nail surgery, a pre-drilling is needed to facilitate the implantation of the nail. The pre-drilling generally includes aiming arm positioning, protective sleeve guiding, and drill hole drilling. The function of the protective sleeve is to prevent the side blade of the drill from directly contacting and crushing soft tissue when the drill rotates. During the operation, the inner end of the protective sleeve must always be in close contact with the lateral cortex of the femur, and it must not retreat when impacted by the rotating force of the drill. Therefore, it must be subjected to a certain inward pressure.

[0003] A common way to pressurize the protective sleeve is to equip the aiming arm with a pressurizing nut and the protective sleeve shaft with corresponding threads. By rotating the pressurizing nut, the inner end of the protective sleeve gradually approaches the lateral cortex of the femur until it is in close contact with the lateral cortex of the femur. The pressurizing method using the pressurizing nut is more accurate in terms of the force applied, as the distance between the inner end of the protective sleeve and the lateral cortex of the femur can be manually shortened linearly during the tightening of the pressurizing nut.

[0004] However, this pressurizing method also has certain drawbacks. Due to the differences in human bodies, the distance between the aiming arm and the lateral cortex of the femur is uncertain. Therefore, the length of the threads on the protective sleeve shaft must be long enough. This results in the need to rotate the pressurizing nut for dozens of times before the protective sleeve can be properly positioned. The pressurizing process is too cumbersome, and the manual adjustment of the pressurizing force is not sufficient for different operators to control. This can result in an insufficient or excessive pressurizing force, making it difficult to unify the pressurizing force. This leads to inaccurate drilling guiding and positioning, affecting the drilling depth, and ultimately resulting in an inaccurate bottom hole position, which can cause the lag screw to be implanted in an inaccurate position, affecting the stability of the intramedullary nail. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a drill guide for a lag screw of an intramedullary nail that is easy to operate, has an easily controlled pressurizing force, and accurately guides and positions the drilling.

[0006] To solve the above technical problems, the present application provides the following technical solutions:

[0007] The invention discloses a drill guide device for lag screw of intramedullary nail, comprising a sighting arm, one end of which is used for detachable connection with the upper end of the main nail of intramedullary nail, and the other end is provided with a lag screw guide hole, a guide sleeve is coaxially arranged in the lag screw guide hole, and a limit button is arranged at the lag screw guide hole of the sighting arm, the limit button has a locked state and an unlocked state, in the locked state, the guide sleeve is locked in the lag screw guide hole, and in the unlocked state, the guide sleeve is slidably connected in the lag screw guide hole.

[0008] Further, a through hole is arranged on the limit button for penetrating the guide sleeve, the inner diameter of the through hole is larger than the outer diameter of the guide sleeve, one of the inner surface of the through hole and the proximal end outer surface of the guide sleeve is provided with a positioning tooth, and the other is provided with a positioning protrusion capable of extending into the positioning tooth.

[0009] Further, the positioning tooth is located on the guide sleeve, the positioning protrusion is located on the inner surface of the through hole near the end of the limit button, and the end of the limit button is provided with a spring;

[0010] And / or, a long circular hole is arranged on the limit button extending along the length direction thereof, a pin hole is arranged on the sighting arm corresponding to the long circular hole, and a positioning pin is penetrated in the pin hole and the long circular hole.

[0011] Further, the first end surface of the positioning protrusion and the first end surface of the positioning tooth are parallel to the cross section of the guide sleeve, the second end surface of the positioning protrusion and the second end surface of the positioning tooth are acute to the cross section of the guide sleeve, the first end surface of the positioning protrusion and the first end surface of the positioning tooth are in abutment, and the second end surface of the positioning protrusion and the second end surface of the positioning tooth are in abutment.

[0012] Or, the first end surface of the positioning protrusion is parallel to the cross section of the guide sleeve, the first end surface of the positioning tooth, the second end surface of the positioning protrusion and the second end surface of the positioning tooth are all acute to the cross section of the guide sleeve, the first end surface of the positioning protrusion and the first end surface of the positioning tooth are in abutment, and the second end surface of the positioning protrusion and the second end surface of the positioning tooth are in abutment.

[0013] Further, the cross section of the lag screw guide hole and the guide sleeve is a circular segment shape;

[0014] And / or, the starting end and the terminal end of the positioning tooth enclose an arc length smaller than the half circumferential length of the cross section of the guide sleeve;

[0015] And / or, the arc length enclosed by the starting end and the terminal end of the positioning tooth corresponds to a radius smaller than the radius of the guide sleeve;

[0016] And / or, the distal end of the guide sleeve is provided with a sharp part for contacting the lateral cortex of the femur.

[0017] Further, the proximal end of the guide sleeve is coaxially provided with a positioning frame on the outside of the aiming arm, the proximal end of the guide sleeve is provided with an abutment, and the abutment is provided with an axially extending positioning hole, and the positioning frame is provided with a positioning column passing through the positioning hole and abutting against the aiming arm.

[0018] Further, a drill rod is arranged in the guide sleeve, the tail of the drill rod is provided with a scale, and the tail of the drill rod is provided with a depth stopper which can be slidably locked at the scale.

[0019] The depth stopper is provided with a control button, the control button has a locked state and an unlocked state, in the locked state, the depth stopper is locked on the drill rod, and in the unlocked state, the depth stopper is slidably connected to the drill rod.

[0020] Further, the connecting end of the aiming arm and the main nail of the intramedullary nail are provided with a plug-in column matched with the threaded hole of the upper end of the main nail of the intramedullary nail, and the edge of the plug-in column is provided with a vertical positioning protrusion matched with a vertical positioning groove of the upper end of the main nail of the intramedullary nail.

[0021] Further, the connecting end of the aiming arm and the main nail of the intramedullary nail are provided with a mounting hole extending along the axis direction of the plug-in column and penetrating the plug-in column, and a fastening screw for connecting to the threaded hole of the upper end of the main nail of the intramedullary nail is arranged in the mounting hole to fix the aiming arm and the main nail of the intramedullary nail together.

[0022] Further, the aiming arm comprises a guide handle, one end of the guide handle is used for detachably connecting the upper end of the main nail of the intramedullary nail, the other end is detachably connected with a guide body arranged in parallel with the main nail of the intramedullary nail, and the tension screw guide hole is arranged on the guide body.

[0023] The present application has the following beneficial effects:

[0024] The aiming arm is provided with a guide sleeve coaxially arranged in the lag screw guide hole, and the aiming arm is provided with a limiting button at the lag screw guide hole. The limiting button has a locking state and an unlocking state. In the locking state, the guide sleeve is locked in the lag screw guide hole. In the unlocking state, the guide sleeve is slidably connected in the lag screw guide hole. At this time, the guide sleeve can be directly pressed to the pressurizing position. Compared with the pressurizing nut, the space occupied is small, the operation is simple and convenient, and the pressurizing degree is easy to control, so that the drilling guide positioning is accurate, the bottom hole position is accurate, and the lag screw implantation position is accurate, and the intramedullary nail stability is good. And only the coaxiality of the lag screw guide hole and the guide sleeve needs to be ensured, the positioning is convenient, and the positioning difficulty is low. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a use structure diagram of the intramedullary nail of the triangular support fixing structure in the intramedullary nail fixing system in the prior art.

[0026] Figure 2 It is a whole structure diagram of the intramedullary nail lag screw drilling guide device of the application.

[0027] Figure 3 It is an exploded structure diagram of the guide handle and the guide body in the intramedullary nail lag screw drilling guide device of the application.

[0028] Figure 4 It is a structure diagram of the guide sleeve in the intramedullary nail lag screw drilling guide device of the application, wherein (a) is a stereogram of one direction, and (b) is a stereogram of another direction.

[0029] Figure 5 It is a structure diagram of the limiting button in the intramedullary nail lag screw drilling guide device of the application.

[0030] Figure 6 It is a sectional structure diagram of the limiting button in the intramedullary nail lag screw drilling guide device of the application, wherein (a) is a structure diagram when the guide sleeve is locked, and (b) is a structure diagram when the guide sleeve is unlocked.

[0031] Figure 7 It is a cooperation structure diagram of the positioning tooth and the positioning protrusion in embodiment 1 of the application.

[0032] Figure 8 It is a cooperation structure diagram of the positioning tooth and the positioning protrusion in embodiment 2 of the application.

[0033] Figure 9 It is a structure diagram of the positioning frame in the intramedullary nail lag screw drilling guide device of the application.

[0034] Figure 10 This is an enlarged structural diagram of the positioning frame in the intramedullary nail tungsten screw drilling guide device of the present invention, wherein (a) is a structural diagram before the positioning frame is installed, and (b) is a structural diagram after the positioning frame is installed;

[0035] Figure 11 This is a schematic diagram of the drill rod structure in the intramedullary nail tension screw drilling guide device of the present invention;

[0036] Figure 12 This is a schematic diagram illustrating the use of the drilling guide device for intramedullary nail traction screws of the present invention. Figure 1 ;

[0037] Figure 13 This is a schematic diagram illustrating the use of the drilling guide device for intramedullary nail traction screws of the present invention. Figure 2 An enlarged structural diagram of the limit button is also shown;

[0038] Figure 14 This is an enlarged structural diagram of the first contact portion of the guide handle in the drilling guide device for intramedullary nail tension screws of the present invention.

[0039] Figure 15 This is a schematic diagram of the guide body in the drilling guide device for intramedullary nail tension screws of the present invention, wherein (a) is a front view and (b) is a perspective view;

[0040] Figure 16 This is a schematic diagram of the locking element in the drilling guide device for intramedullary nail tension screws of the present invention. Detailed Implementation

[0041] To make the technical problems, technical solutions and advantages of the present invention clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0042] This invention provides a drilling guide device for intramedullary nail lag screws, such as... Figures 2-16 As shown, it includes an aiming arm. One end of the aiming arm is used to detachably connect to the upper end of the intramedullary nail main nail 3, and the other end is provided with a tension screw guide hole 25 (i.e., a guide hole for the bottom hole of the inclined nail). A guide sleeve 26 is coaxially arranged in the tension screw guide hole 25. The aiming arm is provided with a limit button 27 at the tension screw guide hole 25. The limit button 27 has a locked state and an unlocked state. In the locked state, the guide sleeve 26 is locked in the tension screw guide hole 25. In the unlocked state, the guide sleeve 26 can be slidably connected in the tension screw guide hole 25.

[0043] In use, first hold the aiming arm, connect one end of the aiming arm to the upper end of the intramedullary nail main nail 3, drive the limiting button 27 to make the limiting button 27 in the unlocked state, then push the guide sleeve 26 into the tension screw guide hole 25, and press the guide sleeve 26 inwardly until the pressurized position (i.e. the distal end of the guide sleeve 26 contacts the lateral cortex of the femur and has a certain pressurized pressure), drive the limiting button 27 to make the limiting button 27 in the locked state, so as to lock the guide sleeve 26 in the tension screw guide hole 25, and finally use the drill rod 5 to drill the inclined tension screw bottom hole along the guide sleeve 26.

[0044] The intramedullary nail tension screw drilling guide device of the present application has a guide sleeve coaxially arranged in the tension screw guide hole on the aiming arm, and the aiming arm is provided with a limiting button at the tension screw guide hole, the limiting button has a locked state and an unlocked state, in the locked state, the guide sleeve is locked in the tension screw guide hole, and in the unlocked state, the guide sleeve is slidably connected in the tension screw guide hole, at this time, only the guide sleeve needs to be pressed inwardly to reach the pressurized position, compared with the pressurized nut, the space occupied is small, the operation is simple and convenient, and the pressurized degree is easy to control, so that the drilling guide positioning is accurate, the bottom hole position is accurate, and then the inclined tension screw implantation position is accurate, the intramedullary nail stability is good, and only the coaxial arrangement of the tension screw guide hole and the guide sleeve needs to be ensured (the prior art needs to ensure the coaxial arrangement of the pressurized nut, the tension screw guide hole and the protective sleeve), the positioning is convenient and the positioning difficulty is low.

[0045] As shown in Figures 4-6 and Figure 13 , in order to conveniently lock the guide sleeve 26 in the tension screw guide hole 25, the limiting button 27 can be provided with a through hole 271 for penetrating the guide sleeve 26, the inner diameter of the through hole 271 is greater than the outer diameter of the guide sleeve 26, one of the inner surface of the through hole 271 and the proximal end outer surface of the guide sleeve 26 is provided with a positioning tooth 261, and the other is provided with a positioning protrusion 272 capable of extending into the positioning tooth 261.

[0046] Further, the positioning tooth 261 can be located on the guide sleeve 26, the positioning protrusion 272 can be located on the inner surface of the end of the through hole 271 close to the limiting button 27, and the end of the limiting button 27 can be provided with a spring 273 to facilitate self-locking and realize the penetration / locking of the guide sleeve 26 during the movement of the limiting button 27. Figure 6 In use, press the limiting button 27, the spring 273 is in a compressed state, the guide sleeve 26 can be unlocked, and the guide sleeve 26 can be smoothly inserted / pulled out (refer to Figure 6 , release the limiting button 27, the limiting button 27 rebounds under the action of the spring 273, the positioning protrusion 272 extends into the positioning tooth 261, so as to lock the position of the guide sleeve 26 (refer to Figure 6 .In section (a), it can achieve quick locking and unlocking, and the operation is simple and convenient. The positioning protrusion 272 is preferably crescent-shaped.

[0047] like Figures 5-6 and Figure 13 As shown, the limit button 27 may be provided with an elongated hole 274 extending along its length direction. A pin hole is provided on the aiming arm at a position corresponding to the elongated hole 274. A positioning pin 275 passes through the pin hole and the elongated hole 274 to limit the movement stroke of the limit button 27 and prevent the limit button 27 from falling off.

[0048] Depending on the different shapes of the positioning tooth 261 and the positioning protrusion 272, the present invention can have the following embodiments:

[0049] Example 1

[0050] like Figure 7 As shown, the first end face of the positioning protrusion 272 ( Figure 7 The right end face of the middle part and the first end face of the positioning tooth 261 ( Figure 7 The left end face of the guide sleeve 26 can be parallel to the cross-section of the guide sleeve 26, positioning the second end face of the protrusion 272. Figure 7 The left end face of the middle tooth 261 and the second end face of the positioning tooth 261 Figure 7 The right end face of the positioning protrusion 272 forms an acute angle with the cross-section of the guide sleeve 26. The first end face of the positioning protrusion 272 abuts against the first end face of the positioning tooth 261, and the second end face of the positioning protrusion 272 abuts against the second end face of the positioning tooth 261. In specific implementation, one of the positioning tooth 261 and the positioning protrusion 272 can be an asymmetrical trapezoidal design, specifically a right-angled trapezoid, and the other is a right-angled trapezoid. This allows the guide sleeve 26 to be pressed inward through the limit button 27 when under force in the locked state, and it cannot retract. That is, in the locked state, the guide sleeve 26 can only be pressed inward in one direction. If the limit button 27 is not unlocked, the guide sleeve 26 cannot retract. In the embodiment shown in the figure, the positioning tooth 261 on the guide sleeve 26 is an asymmetrical trapezoidal design (i.e., a right-angled trapezoid), and the positioning protrusion 272 on the limit button 27 is also a right-angled trapezoid.

[0051] Example 2

[0052] like Figure 8 As shown, the first end face of the positioning protrusion 272 ( Figure 8 The right end face of the positioning tooth 261 can be parallel to the cross-section of the guide sleeve 26. Figure 8 The left end face of the middle section), the second end face of the positioning protrusion 272 ( Figure 8 The left end face of the middle tooth 261 and the second end face of the positioning tooth 261 Figure 8The right end face of the guide sleeve 26 is at an acute angle to the cross-section of the guide sleeve 26. The first end face of the positioning protrusion 272 abuts against the first end face of the positioning tooth 261, and the second end face of the positioning protrusion 272 abuts against the second end face of the positioning tooth 261. In specific implementation, one of the positioning tooth 261 and the positioning protrusion 272 can be an asymmetrical trapezoidal design, specifically a trapezoid with open sides and the other is a right trapezoid. This allows the guide sleeve 26 to be pressed inward through the limit button 27 when under force in the locked state. When the force of the guide sleeve 26 pressing inward exceeds the preset pressure, the guide sleeve 26 can automatically retract (the limit button 27 cannot lock the guide sleeve 26). In use, when the force of the guide sleeve 26 pressing inward exceeds the preset pressure, the limit button 27 automatically changes from the locked state to the unlocked state (i.e., the limit button 27 automatically rebounds), and the guide sleeve 26 automatically retracts. When the force of the guide sleeve 26 pressing inward does not exceed the preset pressure, the limit button 27 automatically changes from the unlocked state to the locked state to lock the position of the guide sleeve 26.

[0053] This embodiment controls the inward pressure of the guide sleeve 26 within a certain range to prevent excessive pressure from causing the guide sleeve 26 to break or the connection between the aiming arm and the intramedullary nail 3 to break. Furthermore, the trapezoidal pressing direction teeth on both sides are more gently sloping, making it easier to pass the limit button 27 when the guide sleeve 26 is pressed inward, but it can only retract backward when subjected to sufficient force in the reverse direction. In this embodiment, the pressure can be automatically controlled, and the preset pressure can be flexibly set according to intraoperative needs. Specifically, the preset pressure can be adjusted by controlling the elasticity of the spring 273, the angle of the trapezoidal sides, etc.

[0054] In the above embodiments, the cross-section of the tension screw guide hole 25 and the guide sleeve 26 can be segmental (specifically D-shaped). When the rod of the guide sleeve 26 is used in conjunction with the tension screw guide hole 25, the guide sleeve 26 can only be inserted / pulled out axially and cannot be rotated (the contact end of the guide sleeve 26 with the lateral cortex of the femur is a pointed tip, and the rotation of the guide sleeve 26 must be prevented).

[0055] like Figure 13 As shown, the guide sleeve 26 may have a concave surface on the outer circle of the positioning tooth 261, so that the guide sleeve 26 at the positioning tooth 261 is 0.2-0.3mm lower than the guide sleeve 26 without the positioning tooth 261 (as indicated by the letter H in the figure). This way, when the guide sleeve 26 is used in conjunction with the tension screw guide hole 25, the positioning tooth 261 will not contact the tension screw guide hole 25, preventing wear on the tension screw guide hole 25. Preferably, the concave surface is a semicircle, allowing the outer circle of the guide sleeve 26 to be used for positioning with the tension screw guide hole 25.

[0056] The arc length between the start end and the end end of the positioning tooth 261 can be less than the half circumference length of the cross section of the guide sleeve 26; the arc length between the start end and the end end of the positioning tooth 261 corresponds to a radius which is preferably less than the radius of the guide sleeve 26, that is, the positioning tooth 261 is a half-circular tooth, that is, the positioning tooth 261 occupies a half-circular rod of the guide sleeve 26, which causes less damage to the rod of the guide sleeve 26, makes the rod of the guide sleeve 26 have high strength, and does not require the tooth front end of the positioning tooth 261 to be smaller than the tooth bottom in diameter (the thread style requires that the thread front end must be thinner than the thread bottom to be screwed in). The positioning tooth 261 is preferably located on the opposite side of the plane of the circular segment structure.

[0057] As shown in Figure 4 and Figure 13 , the distal end of the guide sleeve 26 can be provided with a sharp part for contacting the lateral cortex of the femur to improve the firmness between the distal end of the guide sleeve 26 and the lateral cortex of the femur, thereby improving the overall stability.

[0058] As shown in Figure 2 and Figures 9-10 , the proximal end of the guide sleeve 26 can be coaxially provided with a positioning frame 28 on the outside of the sighting arm, and the proximal end of the guide sleeve 26 can be provided with an abutment 262, the abutment 262 is provided with an axially extending positioning hole 263, and the positioning frame 28 is provided with a positioning column 281 which passes through the positioning hole 263 and abuts against the sighting arm, so as to ensure that the relative position of the positioning frame 28 and the sighting arm is unchanged, thereby keeping the end face position of the positioning frame 28 unchanged, and further providing a positioning reference for drilling of the drill rod 5, so that the drilling is accurately positioned and the bottom hole position is accurate. In the embodiment shown in the figure, the number of positioning holes 263 is three, and the number of corresponding positioning columns 281 is also three.

[0059] As shown in Figures 11-12 , in order to facilitate the adjustment of the drilling depth, the guide sleeve 26 can be provided with a drill rod 5, the tail (i.e. the proximal end) of the drill rod 5 is provided with a scale 51, and the tail of the drill rod 5 is provided with a depth limiting piece 52 which can be slidably and lockably connected at the scale 51.

[0060] The depth limiting piece 52 is provided with a control button 53, the control button 53 has a locked state and an unlocked state, in the locked state, the depth limiting piece 52 is locked on the drill rod 5, in the unlocked state, the depth limiting piece 52 is slidably connected on the drill rod 5, and the internal structure of the control button 53 can be designed according to the common knowledge in the art, which will not be described here. Before use, the control button 53 is driven to make the depth limiting piece 52 in the unlocked state, so as to slide the depth limiting piece 52 to the appropriate scale 51, and then the control button 53 is driven to make the depth limiting piece 52 in the locked state, which can be used.

[0061] The detachable connection between the aiming arm and the main nail 3 of the intramedullary nail can adopt various structural forms that can be easily thought of by those skilled in the art, for example, the connection end of the aiming arm and the main nail of the intramedullary nail is threadedly connected with the threaded hole at the upper end of the main nail of the intramedullary nail; however, for the convenience of implementation, the application preferably adopts the following structural form:

[0062] As shown in Figures 2-3 , the connection end of the aiming arm and the main nail 3 of the intramedullary nail can be provided with a plug-in column 15 matched with the threaded hole 31 at the upper end of the main nail 3 of the intramedullary nail. The edge of the plug-in column 15 can be provided with a vertical positioning protrusion 16 matched with the vertical positioning groove 32 at the upper end of the main nail 3 of the intramedullary nail, so as to prevent the relative rotation of the aiming arm and the main nail 3 of the intramedullary nail.

[0063] Further, in order to improve the firmness of the connection end of the aiming arm and the main nail 3 of the intramedullary nail, the connection end of the aiming arm and the main nail 3 of the intramedullary nail can be provided with a mounting hole 17 extending along the axis direction of the plug-in column 15 and penetrating through the plug-in column 15, and a fastening screw 18 for connecting to the threaded hole 31 at the upper end of the main nail 3 of the intramedullary nail is arranged in the mounting hole 17 to fix the aiming arm and the main nail 3 of the intramedullary nail together. In use, the fastening screw 18 is screwed into the threaded hole 31 at the upper end of the main nail 3 of the intramedullary nail through the mounting hole 17.

[0064] As shown in Figures 2-3 and Figures 12-13 , in order to facilitate intraoperative installation and use, the aiming arm can include a guide handle 1 (which can be C-shaped in particular) and a guide body 2, one end of the guide handle 1 is used for detachable connection with the upper end of the main nail 3 of the intramedullary nail, and the other end is detachably connected with the guide body 2 arranged in parallel with the main nail 3 of the intramedullary nail, and the tension screw guide hole 25 is located on the guide body 2.

[0065] With the development of technology, at present, in the intramedullary nail fixing system for treating femoral intertrochanteric fracture, there appears an intramedullary nail with a triangular support fixing structure, as shown in Figure 1 , which includes a main nail 3 of the intramedullary nail, a diagonal tension screw 33 penetrating through the upper part of the main nail 3 of the intramedullary nail, and a transverse tension screw 34 penetrating through the top of the main nail 3 of the intramedullary nail and the diagonal tension screw 33, so as to form a triangular support, which is firm. The inventor found in the research process that the guide handle and the guide body are fixed by lock bolts, however, the existence of the lock bolts leads to the difficulty in arranging the transverse nail bottom hole guide hole on the guide body under this scheme (the positions of the two are easy to conflict), which leads to inaccurate drilling and positioning, and further leads to inaccurate implantation of the locking screw, thereby affecting the stability of the intramedullary nail. In order to solve this problem, the application preferably adopts the following structural form:

[0066] As shown in Figures 2-3 and Figure 16As shown, the guide body 2 may be provided with a locking member 4 for fixing the guide handle 1 and the guide body 2 together. The locking member 4 is provided with a through hole 41, which is used as a guide hole for the bottom hole of the horizontal nail.

[0067] In this embodiment, the locking component 4 is a two-in-one design, which can realize the connection and locking of the guide handle 1 and the guide body 2. At the same time, the hollow structure can provide drilling guidance for the bottom hole of the horizontal nail. Under the premise of ensuring that the guide handle 1 and the guide body 2 are firmly fixed, it is easy to set the guide hole for the bottom hole of the horizontal nail, which occupies little space and does not interfere with the field of vision. This makes the drilling guidance positioning accurate and the bottom hole position accurate, thereby making the locking screw implantation position accurate and the intramedullary nail stable.

[0068] The locking element 4 on the guide body 2 can adopt various structural forms readily conceived by those skilled in the art; however, for ease of implementation, the present invention preferably adopts the following structural form:

[0069] like Figures 2-3 and Figures 14-15 As shown, the guide handle 1 may have a first fitting part 11 at one end near the guide body 2, and the upper end of the guide body 2 is provided with a second fitting part 21 that cooperates with the first fitting part 11. The locking member 4 is a locking bolt that passes through the second fitting part 21 and the first fitting part 11 in sequence.

[0070] like Figures 14-15 As shown, to facilitate the positioning of the first fitting part 11 and the second fitting part 21, one of the opposite end faces of the first fitting part 11 and the second fitting part 21 may be provided with positioning pins 23 and 24, and the other may be provided with positioning pin holes 13 and 14 that cooperate with the positioning pins 23 and 24. In the embodiment shown in the figure, the first fitting part 11 is provided with positioning pin holes 13 and 14, and the second fitting part 21 is provided with positioning pins 23 and 24 that cooperate with the positioning pin holes 13 and 14.

[0071] Furthermore, the number of positioning pins 23 and 24 is preferably two or more, and they are respectively arranged on the upper and lower sides of the through hole 41. At least one positioning pin is rhomboid, and the shapes of the positioning pin holes 13 and 14 are adapted to the shapes of the positioning pins 23 and 24 to prevent the first fitting part 11 and the second fitting part 21 from shaking or shifting, and to better position the first fitting part 11 and the second fitting part 21. In the embodiment shown in the figure, there are two positioning pins 23 and 24, and they are respectively arranged on the upper and lower sides of the through hole 41. One positioning pin 23 is cylindrical, and the other positioning pin 24 is rhomboid. There are two positioning pin holes 13 and 14, and they are respectively arranged on the upper and lower sides of the through hole 41. One positioning pin hole 13 is a circular positioning pin hole that matches the cylindrical shape, and the other positioning pin hole 14 is a rhomboid positioning pin hole that matches the rhomboid shape.

[0072] The above is the preferred embodiment of the present application, it should be noted that for those skilled in the art, without departing from the principles described in the present application, can also be made several improvements and refinements, these improvements and refinements should also be considered the scope of protection of the present application.

Claims

1. An intramedullary nail lag screw drill guide comprising: The aiming arm is detachably connected to the upper end of the intramedullary nail main nail at one end, and is provided with a tension screw guide hole at the other end, a guide sleeve is coaxially arranged in the tension screw guide hole, the aiming arm is provided with a limit button at the tension screw guide hole, the limit button has a locked state and an unlocked state, in the locked state, the guide sleeve is locked in the tension screw guide hole, in the unlocked state, the guide sleeve is slidably connected in the tension screw guide hole; A through hole is arranged on the limit button for penetrating the guide sleeve, the inner diameter of the through hole is greater than the outer diameter of the guide sleeve, one of the inner surface of the through hole and the proximal end outer surface of the guide sleeve is provided with a positioning tooth, and the other is provided with a positioning protrusion capable of extending into the positioning tooth; The first end surface of the positioning protrusion is parallel to the cross section of the guide sleeve, the first end surface of the positioning tooth, the second end surface of the positioning protrusion and the second end surface of the positioning tooth are all acute angles with the cross section of the guide sleeve, the first end surface of the positioning tooth and the first end surface of the positioning protrusion are in abutment, the second end surface of the positioning tooth and the second end surface of the positioning protrusion are in abutment, one of the positioning tooth and the positioning protrusion is a non-symmetrical trapezoidal design, i.e. a trapezoid with both sides open, and the other is a right trapezoid.

2. The intramedullary nail lag screw drill guide of claim 1, wherein, The positioning tooth is located on the guide sleeve, the positioning protrusion is located on the inner surface of the end of the through hole close to the limit button, and the end of the limit button is provided with a spring; And / or, a long circular hole is arranged on the limit button in the length direction thereof, a pin hole is arranged on the aiming arm at a position corresponding to the long circular hole, and a positioning pin is arranged in the pin hole and the long circular hole.

3. The intramedullary nail lag screw drill guide of claim 1, wherein, The cross section of the tension screw guide hole and the guide sleeve is a circular segment shape; And / or, the arc length enclosed by the starting end and the ending end of the positioning tooth is less than the half circumference length of the cross section of the guide sleeve; And / or, the arc length corresponding to the radius enclosed by the starting end and the ending end of the positioning tooth is less than the radius of the guide sleeve; And / or, the distal end of the guide sleeve is provided with a sharp part for contacting the lateral cortex of the femur.

4. The intramedullary nail lag screw drill guide of claim 1, wherein, A positioning frame is coaxially arranged on the proximal end of the guide sleeve outside the aiming arm, the proximal end of the guide sleeve is provided with an abutment, the abutment is provided with an axially extending positioning hole, and the positioning frame is provided with a positioning column passing through the positioning hole and abutting against the aiming arm.

5. The intramedullary nail lag screw drill guide of Claim 1, wherein, A drill rod is arranged in the guide sleeve, the tail of the drill rod is provided with a scale, and the tail of the drill rod is provided with a depth limiting piece which can be slidably locked at the scale; The depth limiting piece is provided with a control button, the control button has a locked state and an unlocked state, in the locked state, the depth limiting piece is locked on the drill rod, and in the unlocked state, the depth limiting piece is slidably connected on the drill rod.

6. The intramedullary nail lag screw drill guide of any of claims 1-5, wherein, The connecting end of the aiming arm and the intramedullary nail main nail is provided with an insertion column matched with the threaded hole of the upper end of the intramedullary nail main nail, and the edge of the insertion column is provided with a vertical positioning protrusion matched with the vertical positioning groove of the upper end of the intramedullary nail main nail.

7. The intramedullary nail lag screw drill guide of Claim 6, wherein, The connecting end of the aiming arm and the main nail of the intramedullary nail is provided with a mounting hole extending along the axis of the insertion column and penetrating the insertion column, a threaded hole for connecting to the upper end of the main nail of the intramedullary nail is arranged in the mounting hole, and a fastening screw for fixing the aiming arm and the main nail of the intramedullary nail together is arranged in the threaded hole.

8. The intramedullary nail lag screw drill guide of Claim 6, wherein, The aiming arm comprises a guide handle, one end of the guide handle is used for detachably connecting the upper end of the main nail of the intramedullary nail, the other end is detachably connected with a guide body arranged in parallel with the main nail of the intramedullary nail, and the tension screw guide hole is arranged on the guide body; The guide body is provided with a locking member for fixing the guide handle and the guide body together, and the locking member is provided with a through hole penetrating the locking member, and the through hole is used as the transverse nail bottom hole guide hole; The end of the guide handle close to the guide body is provided with a first fitting part, the upper end of the guide body is provided with a second fitting part matched with the first fitting part, and the locking member is a locking bolt penetrating the second fitting part and the first fitting part in sequence.

Images