A method for femoral tunnel positioning, molding aid, and determining positioning points.

Abstract

This invention relates to a femoral tunnel positioning and shaping aid and a method for determining positioning points, belonging to the field of medical device technology. It solves the technical problems of inaccurate femoral tunnel location determination and the lack of auxiliary devices for precise femoral tunnel shaping in existing technologies. The femoral tunnel positioning and shaping aid of this invention includes a bone pin holding component, a bone pin clamping component, and a positioning component. The first end of the bone pin clamping component is provided with a ratchet locking unit; the second end of the bone pin clamping component is provided with a positioning component locking unit; the positioning component includes a positioning hook; a guide pin positioning part is provided on the positioning hook; the bone pin holding component is positioned at the guide pin positioning part. The aid of this invention has a simple structure and is easy to use. It can quickly and accurately determine the femoral tunnel location and also assist in femoral tunnel shaping; the method for determining positioning points using the aid is reliable and easy to implement.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a femoral tunnel positioning and molding aid and a method for determining positioning points. Background Technology

[0002] The stability of the patellofemoral joint in the human body is maintained by its bony structure and peripatellar soft tissues. This includes the static stability provided by the osteochondral structure of the patellofemoral joint, the medial and lateral patellar retinaculum and ligaments, and the dynamic stability provided by the quadriceps femoris muscle. During the knee joint's movement from 0° of extension to 20° of flexion, the medial patellofemoral ligament (MPFL) mainly restricts lateral patellar dislocation to maintain relative stability. When the knee flexion angle is greater, the bony structures such as the trochlear groove of the femur play a greater stabilizing role.

[0003] Patellar joint instability can lead to patellar dislocation. This type of joint dislocation can be divided into acute dislocation and recurrent dislocation, accounting for 2%-3% of knee joint injuries. It is the second leading cause of traumatic joint effusion after anterior cruciate ligament injury.

[0004] Primary patellar dislocation is most common in young women aged 10-17. If not properly managed after the initial dislocation, the chance of re-dislocation is generally 30%-50%. Repeated dislocations accelerate knee joint degeneration, causing severe cartilage damage and significantly impacting quality of life. Medial patellofemoral ligament (MPFL) reconstruction is the most important method for patellar reduction. A normal medial patellofemoral ligament (MPFL) is as follows: Figure 1 As shown.

[0005] Figure 1 This is a schematic diagram of a normal medial patellofemoral ligament (MPFL); it shows the femoral tunnel location 1001, the reconstructed medial patellofemoral ligament (MPFL) 1002, and the oblique patellar bone tunnel 1003. Figure 2 This diagram illustrates inaccurate femoral tunnel location; it shows the incorrect location 1001-1. In medial patellofemoral ligament (MPFL) reconstruction, accurate femoral tunnel location is crucial to the success of the reconstruction. Current techniques primarily use an open approach, with the femoral insertion of the adductor magnus tendon as a reference point, relying on experience for location. Alternatively, C-arm fluoroscopy can be used to obtain knee joint images for location. However, in practice, even the open approach cannot fully reveal the corresponding reference point, leading to easy deviations in femoral tunnel location and unsatisfactory patellar stability. C-arm fluoroscopy requires specialized equipment and conditions at the operation site, which are expensive and difficult to popularize. Even with C-arm fluoroscopy, the use of two-dimensional imaging points to determine three-dimensional reference points results in significant deviations in location determination, making accurate location impossible. Examples of incorrect femoral tunnel location include... Figure 2As shown.

[0006] Currently, there is an urgent need for the rapid and accurate positioning of the femoral tunnel location 1001 using specialized equipment, as well as to assist in the fabrication of the femoral tunnel. Summary of the Invention

[0007] Based on the above analysis, the present invention aims to provide a femoral tunnel positioning and forming aid to solve the technical problem of difficulty in determining the location of the femoral tunnel.

[0008] This invention is achieved through the following technical solution:

[0009] A femoral tunnel positioning and shaping aid includes a bone pin retaining assembly, a bone pin clamping assembly, and a positioning assembly; a first end of the bone pin clamping assembly is provided with a ratchet locking unit; a second end of the bone pin clamping assembly is provided with a positioning assembly locking unit; the positioning assembly includes a positioning hook; a guide pin positioning part is provided on the positioning hook; the guide pin positioning part is an arc surface; the bone pin retaining assembly is positioned on the guide pin positioning part.

[0010] Furthermore, the positioning hook includes a positioning handle, the guide pin positioning part, and a positioning hook unit arranged sequentially.

[0011] Furthermore, the positioning hook unit includes a main positioning support plate, a secondary positioning support plate, and a positioning body; the main positioning support plate is parallel to the positioning handle.

[0012] Furthermore, the positioning body is provided on the lower end face of the positioning main support plate and the positioning secondary support plate respectively.

[0013] Furthermore, the positioning body is a cone; the two cones are equidistant from the center of the arc surface of the guide pin positioning part.

[0014] Furthermore, the positioning component also includes a positioning connecting handle and a positioning mounting handle; the two ends of the positioning connecting handle are respectively connected to the positioning hook and the positioning mounting handle.

[0015] Furthermore, the bone pin clamping assembly includes a bone pin clamping part, a bone pin clamping second part, and a bone pin clamping connecting part; the connecting surface of the bone pin clamping part and the bone pin clamping second part is provided with a bone pin clamping hole; the ratchet locking unit is disposed on the bone pin clamping second part and faces the bone pin clamping hole.

[0016] Furthermore, the bone needle clamping connection includes a bone needle clamping connecting shaft and a bone needle clamping locking unit; the bone needle clamping locking unit includes a bone needle clamping locking hook and a bone needle clamping locking shaft.

[0017] Furthermore, the bone pin retaining assembly includes a guide sleeve; the guide sleeve includes a tubular guide sleeve body and a guide sleeve handle.

[0018] A method for determining positioning points using a femoral tunnel positioning and shaping device, the method using the aforementioned femoral tunnel positioning and shaping device, comprising the following steps:

[0019] S1. Assemble the femoral tunnel positioning and molding aids;

[0020] S2, Human Preparation:

[0021] S3. Use the femoral tunnel for positioning and shaping to find the positioning point for the use of the assistive device;

[0022] S4. The locking element of the locking accessory is used to align the guide sleeve with the accessory positioning point determined in S3. Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0023] 1. The femoral tunnel positioning and forming aid of the present invention has a simple structure and is easy to use, and can quickly and accurately determine the position of the femoral tunnel;

[0024] 2. The method for determining positioning points used in the assistive device of the present invention is reliable and easy to implement;

[0025] 3. The femoral tunnel positioning and forming aids involved in this invention can assist in the forming of the femoral tunnel.

[0026] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained from what is particularly pointed out in the description and drawings. Attached Figure Description

[0027] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0028] Figure 1 This is a schematic diagram of the medial patellofemoral ligament (MPFL).

[0029] Figure 2 This is a schematic diagram illustrating the misposition of the femoral tunnel.

[0030] Figure 3 This is a schematic diagram illustrating the principle of using positioning points to determine the assistive device of the present invention;

[0031] Figure 4 This is a schematic diagram of the overall structure of the first embodiment of the present invention;

[0032] Figure 5 This is a schematic diagram of the positioning component structure according to the first embodiment of the present invention;

[0033] Figure 6 This is a schematic diagram of the positioning hook structure of the present invention;

[0034] Figure 7 This is a schematic diagram showing the dimensions and position of the positioning hook of the present invention;

[0035] Figure 8 This is a schematic diagram of the bone needle clamping assembly structure according to the first embodiment of the present invention;

[0036] Figure 9 for Figure 8 A schematic diagram of the ratchet locking unit structure with a AA-direction section;

[0037] Figure 10 This is a schematic diagram of the bone needle clamping and locking unit structure of the present invention;

[0038] Figure 11 for Figure 10 Schematic diagram of cross-section along the major axis;

[0039] Figure 12 This is a schematic diagram of the overall structure of the second embodiment of the present invention;

[0040] Figure 13 for Figure 12 Schematic diagram of the central plane section;

[0041] Figure 14 for Figure 13 Enlarged view of part B in the middle;

[0042] Figure 15 This is a schematic diagram of the second clamping part of the bone needle according to the second embodiment of the present invention.

[0043] Figure label:

[0044] 1. Bone pin retaining assembly; 11. Guide pin; 111. Blade head; 112. Pin shank; 12. Guide sleeve; 121. Guide sleeve body; 1211. Guide sleeve body thorn compression unit; 1212. Guide sleeve body thorn; 122. Guide sleeve handle; 123. Guide sleeve hole; 2. Bone pin clamping assembly; 21. Bone pin clamping part 1; 211. Bone pin clamping positioning groove; 212. Bone pin clamping mounting part; 22. Bone pin clamping part 2; 221. Clamping thorn tooth mounting part; 231. Bone pin clamping connecting shaft; 23 2. Bone pin clamping and locking unit; 2321. Bone pin clamping and locking hook; 23211. Hook body; 23212. Hook spring; 23213. Hook positioning shaft; 23214. Hook cover; 23215. Hook lifting button; 2322. Bone pin clamping and locking shaft; 24. Bone pin clamping hole; 25. Tooth locking unit; 251. Tooth clamping sealing plug; 252. Tooth clamping spring; 253. Tooth clamping; 26. Positioning component locking unit; 27. Bone pin optical shaft Locking unit; 28. Compression spring; 2-1. Second clamping assembly for bone needles; 2-11. Second clamping part of bone needles; 2-111. Second clamping gripping part of bone needles; 2-112. Second clamping bending part of bone needles; 2-113. Second clamping bending positioning mounting part of bone needles; 26-1. Second locking pin; 3. Positioning assembly; 31. Positioning hook part; 311. Positioning handle; 312. Positioning hook unit; 3121. Positioning secondary support plate; 3122. Positioning main support plate; 3123. Position body; 313. Guide pin positioning part; 32. Positioning connecting handle; 33. Positioning mounting handle; 331. Positioning mounting handle scale line; 3-1. Second positioning component; 3-12. Second positioning connecting handle; 3-13. Second positioning mounting part; 1001. Femoral tunnel position; 1001-1. Incorrect positioning position of femoral tunnel; 1002. Reconstructed MPFL; 1003. Oblique bone tunnel of patella; 1004. Insertion point of adductor magnus tendon; 1005. Midpoint of posterior edge of medial femoral condyle. Detailed Implementation

[0045] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0046] The following is combined with Figures 3-15 The technical solution of the present invention will be described in more detail below:

[0047] This invention specifically relates to a femoral tunnel positioning and molding aid. For example... Figure 3 The femoral tunnel location 1001 shown is the positioning point for the use of the device of the present invention.

[0048] Indicative structures around the femur include the insertion point of the adductor magnus tendon at 1004, characterized by a prominent high point, and a distinct arc-shaped ridge posterior to the medial femoral condyle, the midpoint of which is marked as the midpoint of the posterior edge of the medial femoral condyle at 1005. Figure 3 As shown. These two reference points are relatively easy to find.

[0049] Currently, by finding the relative positional changes of the vastus medialis muscle (VMO), adductor magnus tendon (AMT), and medial patellar ligament (MPFL), and the intrinsic connection between the adductor magnus tendon insertion point 1004 and the midpoint 1005 of the posterior edge of the medial femoral condyle, the precise positioning of the femoral tunnel position 1001 is achieved in a relatively fixed position, that is, the positioning of the positioning point of the device of the present invention.

[0050] Specifically, circles are drawn with the insertion point of the adductor magnus tendon (1004) and the midpoint of the posterior edge of the medial condyle of the femur (1005) as centers, and a radius of length L. The intersection of these two circles is identified as the femoral tunnel location (1001), which is used as the position for drilling the femoral tunnel and installing screws during surgery. The length L can be further determined based on the patient's body size.

[0051] Based on the average height of women in China, the value of L is taken as 8mm; based on the average height of men in China, the value of L is taken as 9mm; for those who are particularly tall, the value of L is taken as 10mm.

[0052] Taking the average height of women as an example, the preferred femoral tunnel position is 1001, which is the positioning point for the use of the device of the present invention. During the determination process, L = 8mm is selected.

[0053] The technical solution of the femoral tunnel positioning and molding device specific embodiment one is as follows:

[0054] A femoral tunnel positioning and shaping aid, such as Figure 4 As shown, the assembly includes a bone pin retaining component 1, a bone pin clamping component 2, and a positioning component 3. The first end of the bone pin clamping component 2 is connected to the bone pin retaining component 1; the second end of the bone pin clamping component 2 is connected to the positioning component 3; the positioning component 3 includes a positioning hook portion 31; a guide pin positioning portion 313 is provided on the positioning hook portion 31; the bone pin retaining component 1 includes a guide pin 11 and a guide sleeve 12, the guide pin 11 is inserted into the guide sleeve 12, and the guide sleeve 12 is used to keep the position of the guide pin 11 stable and ensure that the end of the guide pin 11 is stably positioned in the guide pin positioning portion 313.

[0055] Specifically, such as Figure 6 As shown; the positioning hook 31 includes a positioning handle 311, a guide pin positioning part 313, and a positioning hook unit 312 arranged sequentially; the radius of the guide pin positioning part 313 is the same as the radius of the guide pin 11. The design basis of the positioning hook 31 is... Figure 3 A schematic diagram illustrating the principle of determining the location of the femoral tunnel, and the resulting technical solution is as follows: Figure 7A schematic diagram showing the dimensions and position of the positioning hook 31.

[0056] Specifically, the positioning handle 311 is a straight support rod with a certain rigidity; on the one hand, the straight direction of the positioning handle 311 serves as a directional guide in the process of finding the femoral tunnel position 1001, and on the other hand, the positioning handle 311 serves as a strong support for the positioning hook unit 312 and the guide pin positioning part 313.

[0057] Specifically, the guide pin positioning part 313 has a semi-cylindrical space, the radius Ra of which is not less than the radius of the guide pin 11; preferably, the radius Ra of the guide pin positioning part 313 is equal to the radius of the guide pin 11. The function of the guide pin positioning part 313 is to guide the guide pin 11 during the downward insertion of the guide pin 11 into the femur after positioning is completed.

[0058] Specifically, the positioning hook unit 312 includes a positioning main support plate 3122, a positioning secondary support plate 3121, and a positioning body 3123; the positioning body 3123 is disposed at the lower end face of the positioning main support plate 3122 and the positioning secondary support plate 3121, such as... Figure 6 As shown.

[0059] The positioning main support plate 3122 is parallel to the positioning handle 311. Preferably, one side of the positioning main support plate 3122 is aligned with the side edge of the positioning handle 311 on the same side, and the width W2 of the positioning main support plate 3122 is half the width W of the positioning handle 311, i.e., W = 2 * W2. Preferably, when L = 8mm, W = 3mm and W2 = 1.5mm are taken.

[0060] The positioning sub-support plate 3121 is related to the position of the positioning main support plate 3122. The two are set at a certain angle with the center of the guide pin positioning part 313 as their geometric center. This angle is as follows: Figure 7 In this embodiment, the body posture is defined as follows: the legs are bent at 60°, i.e., the angle between the thigh and calf is 120°. Clinically, this is generally a cross-legged position. In this posture, the lateral inner edge of the adductor magnus muscle (VMO) and the adductor magnus tendon are in a basically parallel position. Preferably, D = 47°. Preferably, the width W1 of the positioning support plate 3121 is less than W2, the purpose being to minimize obstruction of the operator's field of vision while ensuring functionality. Specifically, W2 = 1.5 mm.

[0061] Preferably, the positioning body 3123 is a cone, with its center located on an arc surface centered on the center of the guide pin positioning part 313. Specifically, the bottom surface of the cone is located at the ends of the main positioning support plate 3122 and the secondary positioning support plate 3121. The radius of this arc surface is... Figure 7The value of L is shown in the figure. In this specific embodiment, L is preferably 8 mm. More preferably, the main support plate positioning body 3123 is a cylinder with a tapered end for insertion into the periosteum and real-time stable positioning.

[0062] Specifically, such as Figure 4 and Figure 5 As shown, the positioning component 3 also includes a positioning connecting handle 32 and a positioning mounting handle 33; the positioning connecting handle 32 connects the positioning hook 31 and the positioning mounting handle 33, and is set at an angle to the positioning mounting handle 33. Preferably, the positioning connecting handle 32, the positioning hook 31 and the positioning mounting handle 33 are integrally formed and made of structural steel; the end of the positioning mounting handle 33 is provided with a slide rail for matching connection.

[0063] Specifically, such as Figure 10 , Figure 11 and Figure 8 As shown, the bone pin clamping assembly 2 includes a bone pin clamping part 21, a bone pin clamping part 22, and a bone pin clamping connecting part. The bone pin clamping connecting part includes a bone pin clamping connecting shaft 231 that hinges the bone pin clamping part 21 and the bone pin clamping part 22 at a first end. The bone pin clamping part 21 and the bone pin clamping part 22 are each provided with a matching mounting hole for the bone pin clamping connecting shaft 231 to pass through. The two parts move relative to each other, opening and closing, with the bone pin clamping connecting shaft 231 as the rotation axis. Optionally, the bone pin clamping connecting shaft 231 is a stepped shaft, with a nut used for locking at the small end; preferably, the bone pin clamping connecting shaft 231 is a smooth shaft, with both ends riveted together after connection. The bone pin clamping connection also includes a bone pin clamping locking unit 232; the bone pin clamping locking unit 232 is located on the end face opposite to the bone pin clamping connection shaft 231, and is used to lock the bone pin clamping part 21 and the bone pin clamping part 22; the bone pin clamping locking unit 232 includes a bone pin clamping locking hook 2321 and a bone pin clamping locking shaft 2322. Specifically, the mating surfaces of the bone pin clamping part 21 and the bone pin clamping part 22 are provided with a structure for mounting the bone pin clamping locking hook 2321 and the bone pin clamping locking shaft 2322, such as... Figure 4 and Figure 8 As shown. Preferably, the bone needle clamping locking shaft 2322 shown has a threaded end, a smooth shaft in the middle, and a stepped shaft at the end; wherein, the threaded end is used to connect to the bone needle clamping part 21, and the smooth shaft is used to connect to the bone needle clamping locking hook 2321. Preferably, the bone needle clamping locking hook 2321 includes a hook body 23211, a hook spring 23212, a hook positioning shaft 23213, a hook pressure cap 23214, and a hook lifting button 23215, which are installed together in sequence; wherein, the hook pressure cap 23214 is threaded to the upper end of the hook body 23211, the hook positioning shaft 23213 is fixedly connected to the hook lifting button 23215, and the hook spring 23212 is pressed against the lower end face of the hook pressure cap 23214 and the upper end face of the lower platform of the hook positioning shaft 23213.

[0064] Specifically, after the bone needle clamping part 21 and the bone needle clamping part 22 are locked together, a bone needle clamping hole 24 is formed between the two end faces, such as Figure 4 and Figure 8 As shown. The bone pin retaining assembly 1 passes through the bone pin clamping hole 24 to form a punched working position. However, in order to limit the bone pin retaining assembly 1, as... Figure 9 As shown, a ratchet mounting portion 221 is also provided on the outer end face of the bone needle clamping part 22 for mounting the ratchet locking unit 25. Optionally, the ratchet mounting portion 221 has a stepped hole structure, connecting to the bone needle clamping hole 24; the outermost end is provided as a threaded hole. Preferably, the ratchet locking unit 25 includes a ratchet sealing plug 251, a ratchet spring 252, and a ratchet 253, which are installed sequentially from the outer end face of the bone needle clamping part 22 into the stepped hole of the ratchet locking unit 25; wherein, the ratchet sealing plug 251 is a threaded plug that matches and connects with the threaded hole of the ratchet mounting portion 221; the ratchet 253 has a stepped shaft structure, with the large shaft end limited at the shaft platform of the inner hole of the ratchet mounting portion 221, and the small shaft end face is provided with a ratchet, which is located in the bone needle clamping hole 24, specifically limiting the bone needle retaining assembly 1. Preferably, the outer end face of the bone needle clamping part 22 is provided with a threaded hole that connects to the bone needle clamping hole 24, and the ratchet locking unit 25 is a locking bolt. More preferably, the end face of the locking bolt of the ratchet locking unit 25 is machined with a cylindrical concave surface, the diameter of which is the same as the outer diameter of the guide sleeve 121, which facilitates fitting the guide sleeve 121 and optimizes the clamping effect.

[0065] Specifically, the first end of the bone needle clamping part 21 is provided with a bone needle clamping mounting part 212 for connecting the bone needle clamping part 22; the second end of the bone needle clamping part 21 is provided with a bone needle clamping positioning groove 211 for connecting with the slide rail on the positioning mounting handle 33; the second end of the bone needle clamping part 21 is also provided with a positioning component locking unit 26 for locking the positioning mounting handle 33 onto the bone needle clamping part 21. Preferably, the positioning mounting handle 33 is provided with a scale line 331; the scale line 331 is located on the slide rail of the positioning mounting handle 33; when the slide rail of the positioning mounting handle 33 is adjusted into position within the bone needle clamping positioning groove 211, so that the bone needle holding component 1 is exactly perpendicular to the positioning hook part 31 and the guide needle 11 is directly opposite the guide needle positioning part 313, the positioning component locking unit 26 is immediately locked, so that the bone needle clamping part 21 is securely connected to the positioning mounting handle 33.

[0066] Preferably, in the first embodiment, the positioning hook 31 is a replaceable part, and different replaceable parts have different L values ​​as in the first embodiment, such as... Figure 7 As shown. Optionally, L = 7mm, L = 8mm, L = 9mm, and L = 10mm can be used to accommodate patients of different body types. Preferably, L = 8mm is suitable for the average height of Chinese women.

[0067] Specifically, the guide needle 11 includes a needle handle 112, and a cutting head 111 is provided at the first end of the needle handle 112. The cutting head 111 is sleeved on the upper end of the needle handle 112; the cutting head 111 has a polyhedral blade structure.

[0068] Specifically, the bone pin retaining assembly 1 includes a guide sleeve 12. The guide sleeve 12 is provided with a through guide sleeve hole 123, through which a guide pin 11 passes; the guide sleeve 12 includes a tubular guide sleeve body 121 and a guide sleeve handle 122.

[0069] Preferably, the guide sleeve handle 122 is located at the upper end of the guide sleeve body 121; it is used for etching marks and for applying force to press the guide sleeve 12 downwards; a guide sleeve body ratchet unit 1211 is provided on the side of the guide sleeve body 121, which cooperates with the clamping ratchet 253. This ratchet structure is a reverse tooth structure relative to the downward movement direction of the guide sleeve body 121, such as... Figure 4 and Figure 9 As shown, the guide sleeve 121 can be positioned within the bone needle clamping hole 24.

[0070] Preferably, the annular portion at the lower end of the guide sleeve 121 is configured as a guide sleeve blade tooth 1212 with a multifaceted blade structure. When the guide needle 11 is not installed, the guide sleeve 121 first descends into the guide needle positioning part 313, and the blade of the guide sleeve tooth 1212 is inserted into the periosteum or even the surface of the femur to quickly position it so that the guide needle 11 can be accurately installed at the femoral tunnel position 1001, so as to carry out the operation and speed up the operation process.

[0071] The technical solution of the second specific embodiment of the femoral tunnel positioning and molding device is as follows:

[0072] In the second specific embodiment, the guide sleeve 12 includes a tubular guide sleeve body 121 and a guide sleeve handle 122, wherein the outer surface of the guide sleeve body 121 is a light column. Correspondingly, the bone needle clamping part 22 locks the guide sleeve 12 using a bone needle light axis locking unit 27, specifically a light axis set screw; the light axis set screw clamps the guide sleeve body 121 of the light axis body, preferably using the light axis set screw in conjunction with an elastic washer to increase the clamping force.

[0073] In specific embodiment two, the second positioning component 3-1 and the second bone needle clamping component 2-1 are used instead of the positioning component 3 and the bone needle clamping component 2 in specific embodiment one; for example Figure 12 , Figure 13 , Figure 14 and Figure 15 As shown.

[0074] Specifically, such as Figure 14 and Figure 15As shown, the second bone needle clamping assembly 2-1 includes a second bone needle clamping part 2-11 and a second bone needle clamping part 22; the second bone needle clamping part 2-11 includes a second bone needle clamping holding part 2-111 and a second bone needle clamping bending part 2-112, which are integrally formed. The end of the second bone needle clamping bending part 2-112 is provided with a second bone needle clamping bending positioning mounting part 2-113, which is used to connect the second positioning assembly 3-1 via fasteners. Preferably, the second bone needle clamping bending positioning mounting part 2-113 is composed of an axial blind hole and a radial locking hole.

[0075] Specifically, such as Figure 14 As shown, the second positioning component 3-1 includes a positioning hook 31 and a second positioning connecting handle 3-12; the two are integrally formed. The end of the second positioning connecting handle 3-12 is provided with a second positioning mounting portion 3-13; preferably, the second positioning mounting portion 3-13 has a stepped shaft structure, such as... Figure 14 As shown, a connecting hole is provided on the large-diameter shaft for a fastener to pass through. This fastener connects the second positioning connecting handle 3-12 and the second clamping bend of the bone needle 2-112. Optionally, the fastener is a second settling pin 26-1.

[0076] Preferably, a compression spring 28 is provided between the second positioning mounting part 3-13 and the second clamping and bending positioning mounting part 2-113 of the bone needle to eliminate the installation error between the two mounting parts during the working process and increase the positional stability of the positioning hook part 31 during the working process.

[0077] Preferably, in the second specific embodiment, the positioning hook 31 is a replaceable part, and different replaceable parts have different... Figure 7 The L value shown is optional. L = 7mm, L = 8mm, L = 9mm, and L = 10mm can be used to accommodate different body types. Preferably, L = 8mm is suitable for the average height of Chinese women.

[0078] Preferably, after the installation and debugging of the second specific embodiment are completed, the guide sleeve 12 and the guide needle positioning part 313 are concentric.

[0079] The first implementation plan describes the femoral tunnel positioning and shaping device, and introduces the method of determining the positioning point for femoral tunnel positioning and shaping device, with the following steps:

[0080] S1. Assemble the femoral tunnel positioning and molding aid:

[0081] S11. Align the scale line 331 on the positioning mounting handle 33 with the edge of the bone needle clamping part 21, and tighten the positioning component locking unit 26.

[0082] S12. Place the guide sleeve 12 in the bone needle clamping hole 24, so that the guide sleeve body blade teeth 1212 are away from the positioning hook part 31; close the bone needle clamping part 22 on the bone needle clamping part 21, operate the bone needle clamping locking hook 2321 to lock the bone needle clamping part 22 and the bone needle clamping part 21.

[0083] S2. Human preparation:

[0084] Position the body with knees bent and legs crossed until the thighs and calves form a 120° angle, so that the outer inner edge of the vastus medialis muscle (VMO) is basically parallel to the adductor magnus tendon (AMT).

[0085] S3. Use the femoral tunnel for positioning and shaping to find the positioning point for the use of the assistive device;

[0086] S31, hold the bone needle clamp 21 and move the positioning hook 31 forward; during this time, keep the side wall of the positioning hook 31 parallel to the adductor magnus tendon (AMT) and close to the edge of the vastus medialis muscle (VMO).

[0087] S32. Move the positioning hook 31 forward until the tip of the positioning body 3123 of the positioning main support plate 3122 reaches the insertion point 1004 of the adductor magnus tendon, which is a clear high point; at this time, press down so that the tip inserts into the periosteum at the insertion point 1004 of the adductor magnus tendon.

[0088] S33, fine-tune the positioning auxiliary plate 3121 so that the tip of the positioning body 3123 at its lower end coincides with the midpoint 1005 of the posterior edge of the medial condyle of the femur;

[0089] S4. Locking the locking element of the locking device, aligning the guide sleeve 121 with the device positioning point determined in S3:

[0090] Loosen the clamping ratchet sealing plug 251, press the guide sleeve handle 122 so that the lowest end of the guide sleeve 12 is aligned with the center of the guide needle positioning part 313 through the guide needle positioning part 313; tighten the clamping ratchet sealing plug 251.

[0091] Complete the femoral tunnel positioning and determine the positioning points for the molding aid.

[0092] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Furthermore, any equipment equipped with this device to expand its application field and produce combined technical effects falls within the scope of protection of this invention.

Claims

1. A femoral tunnel positioning and shaping aid, characterized in that, It includes a bone pin retaining component (1), a bone pin clamping component (2), and a positioning component (3); The first end of the bone pin clamping assembly (2) is provided with a tooth locking unit (25); the second end of the bone pin clamping assembly (2) is provided with a positioning component locking unit (26). The positioning component (3) includes a positioning hook (31); a guide pin positioning part (313) is provided on the positioning hook (31); the guide pin positioning part (313) is an arc surface; the bone pin retaining component (1) is positioned on the guide pin positioning part (313); the positioning hook (31) includes a positioning handle (311), the guide pin positioning part (313) and a positioning hook unit (312) arranged in sequence; the positioning hook unit (312) includes a positioning main support plate (3122), a positioning secondary support plate (3121) and a positioning body (3123); the positioning main support plate (3122) is parallel to the positioning handle (311) 11); The lower end faces of the main positioning plate (3122) and the secondary positioning plate (3121) are respectively provided with positioning bodies (3123); the positioning body (3123) of the main positioning plate (3122) corresponds to the position of the insertion point (1004) of the adductor magnus tendon, and the positioning body (3123) of the secondary positioning plate (3121) corresponds to the position of the midpoint (1005) of the posterior edge of the medial condyle of the femur; the positioning body (3123) is a cone; the two cones are equidistant from the center of the arc surface of the guide needle positioning part (313), and the distance between the cone and the center of the guide needle positioning part (313) is L; Among them, circles are drawn with the insertion point of the adductor magnus tendon (1004) and the midpoint of the posterior edge of the medial condyle of the femur (1005) as the center and the length L as the radius. The intersection of the two circles is the location of the femoral tunnel (1001).

2. The femoral tunnel positioning and forming aid according to claim 1, characterized in that, The positioning component (3) further includes a positioning connecting handle (32) and a positioning mounting handle (33); the two ends of the positioning connecting handle (32) are respectively connected to the positioning hook (31) and the positioning mounting handle (33).

3. The femoral tunnel positioning and forming aid according to claim 1, characterized in that, The bone pin clamping assembly (2) includes a bone pin clamping part (21), a bone pin clamping part (22), and a bone pin clamping connecting part; the connecting surfaces of the bone pin clamping part (21) and the bone pin clamping part (22) are provided with bone pin clamping holes (24); the tooth locking unit (25) is disposed on the bone pin clamping part (22) and faces the bone pin clamping holes (24).

4. The femoral tunnel positioning and forming aid according to claim 3, characterized in that, The bone needle clamping connection includes a bone needle clamping connection shaft (231) and a bone needle clamping locking unit (232); the bone needle clamping locking unit (232) includes a bone needle clamping locking hook (2321) and a bone needle clamping locking shaft (2322).

5. The femoral tunnel positioning and forming aid according to claim 4, characterized in that, The bone pin retaining assembly (1) includes a guide sleeve (12); the guide sleeve (12) includes a tubular guide sleeve body (121) and a guide sleeve handle (122).

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