CN111494023A - Posterior Cruciate Ligament Tibial Guide - Google Patents

Abstract

The invention provides a posterior cruciate ligament tibial guide, which relates to the technical field of medical devices and is used to solve the technical problem of poor treatment effect of the current posterior cruciate ligament reconstruction surgery. The posterior cruciate ligament tibial guide includes a support provided with a guide hole and a swing arm slideway; a guide rod slidably installed in the guide hole, the guide rod is provided with a guide pin slideway running through both ends thereof; The eccentric positioning swing arm of the adjusting arm and the connecting arm, the adjusting arm is slidably installed in the swing arm slideway, the rear end of the connecting arm is connected with the distal guide hole end of the adjusting arm, and the front end of the connecting arm A tibial hook bent toward the guide rod is provided, and the vertical distance from the tibial hook to the axis of the guide rod is 2-7 mm. The posterior cruciate ligament tibial guide provided by the present invention is used to assist in determining the attachment point of the posterior cruciate ligament reconstruction on the tibial plateau.

Description

Posterior Cruciate Ligament Tibial Guide

technical field

The invention relates to the technical field of medical devices, in particular to a posterior cruciate ligament tibial guide for posterior cruciate ligament repair surgery.

Background technique

The knee joint is an important joint responsible for supporting the body weight and flexing and extending the lower limbs. It includes the femoral condyle at the distal end of the femur, the tibial plateau at the proximal end of the tibia, and the anterior cruciate ligament and the posterior cruciate ligament that connect the femoral condyle and the tibial plateau. Among them, the anterior cruciate ligament extends from the back of the femoral condyle to the front of the intercondylar eminence of the tibial plateau, which is used to limit the anterior displacement of the tibia; the posterior cruciate ligament extends from the front of the femoral condyle to the rear of the intercondylar eminence of the tibial plateau. , used to limit the posterior displacement of the tibia; maintain the stability of the knee joint in the anterior and posterior directions through the anterior cruciate ligament and the posterior cruciate ligament.

Since the knee joint is one of the important weight-bearing joints in the human body, when the human body is walking or exercising vigorously, the knee joint needs to be alternately affected by the body weight and movement acceleration in a short period of time, which is easy to cause the knee joint in the case of insufficient muscle protection. Internal cruciate ligament injury, such as the phenomenon of posterior cruciate ligament rupture or injury, often requires posterior cruciate ligament reconstruction surgery after posterior cruciate ligament rupture or injury. Because the location of the attachment point of the posterior cruciate ligament (tibial insertion) has a significant impact on the tension of the posterior cruciate ligament bundle and the maintenance of the posterior stability of the tibia, one of the difficulties in posterior cruciate ligament reconstruction surgery is to determine the location of the posterior cruciate ligament reconstruction in the tibia. An attachment point on the platform. At present, the posterior cruciate ligament tibial guide designed according to the center point positioning method is often used to assist in determining the attachment point of the posterior cruciate ligament reconstruction. During the reconstruction of the posterior cruciate ligament, the swing arm of the posterior cruciate ligament tibial guide is implanted into the joint cavity on the inside of the knee joint. It is fixed on the tibia, and the guide pin is inserted into the guide slide of the guide rod. When the guide pin penetrates the tibial plateau, the place where the guide pin passes through the tibial plateau is the attachment point of the reconstructed ligament.

However, the front end of the above-mentioned swing arm is placed about 10mm behind the tibial plateau and the tibial insertion point is obtained according to the average value of different human bodies. The posterior cruciate ligament reconstruction attachment points determined at a distance of 10 mm from the tibial insertion point behind the tibial plateau are quite different, and the determined attachment points of the posterior cruciate ligament reconstruction may not be the ideal attachment point, resulting in poor surgical treatment effect of the posterior cruciate ligament reconstruction.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a posterior cruciate ligament tibial guide, which is used to determine the ideal attachment point of the posterior cruciate ligament reconstruction on the tibial plateau and improve the surgical treatment effect of the posterior cruciate ligament reconstruction.

In order to achieve the above object, the present invention provides the following technical solutions:

The invention provides a posterior cruciate ligament tibial guide, which comprises: a support provided with a guide hole and a swing arm slideway; a guide rod slidably installed in the guide hole, the guide rod is provided with a guide rod extending through the two guide rods. The eccentric positioning swing arm with an adjusting arm and a connecting arm, the adjusting arm is slidably installed in the swing arm slideway, and the rear end of the connecting arm is connected with the distal guide hole end of the adjusting arm , the front end of the connecting arm is provided with a tibial hook bent toward the guide rod, and the vertical distance from the tibial hook to the axis of the guide rod is 2-7 mm.

Compared with the prior art, the posterior cruciate ligament tibial guide provided by the present invention has the following advantages:

In the posterior cruciate ligament tibial guide provided by the present invention, since the front end of the eccentrically positioned swing arm is provided with a tibial hook that is hooked on the posterior side of the tibial plateau during reconstruction of the posterior cruciate ligament, it can be offset from the posterior side of the tibial plateau. Move a certain distance to determine the ideal attachment point of the posterior cruciate ligament reconstruction on the tibial plateau. Because the posterior cruciate ligament tibial guide provided by the present invention is based on the anatomical discovery that "the attachment point of the posterior cruciate ligament on the tibial plateau is closer to the posterior side of the tibial plateau, the more conducive to restoring the function of the original ligament and joint stability." The ideal attachment point of the posterior cruciate ligament reconstruction on the tibial plateau is determined. Therefore, compared with the prior art, the attachment point of the posterior cruciate ligament determined by the posterior cruciate ligament tibial guide provided by the present invention is more ideal, so the improvement is obviously improved. The effect of posterior cruciate ligament reconstruction surgery.

As an improvement of the above-mentioned posterior cruciate ligament tibial guide of the present invention, the vertical distance from the tibial hook to the axis of the guide rod is 5 mm.

As an improvement of the above-mentioned posterior cruciate ligament tibial guide according to the present invention, the slideway of the swing arm is an arc-shaped slideway, and the adjustment arm is an arc-shaped arm.

As a further improvement of the posterior cruciate ligament tibial guide of the present invention, the adjustment arm is provided with a scale mark indicating the angle between the connecting arm and the guide rod, and one edge of the swing arm slideway is provided There are pointers matched with the scale marks.

As a further improvement of the above-mentioned posterior cruciate ligament tibial guide of the present invention, the scale mark on the adjustment arm ranges from 40° to 70°.

As another improvement of the posterior cruciate ligament tibial guide of the present invention, the swing arm slideway is a dovetail slideway, and the adjustment arm is a trapezoid slideway adapted to the dovetail slideway.

As another improvement of the posterior cruciate ligament tibial guide of the present invention, from the front end of the connecting arm, a section of the connecting arm extending toward the rear end of the connecting arm is bent toward the guide rod, and this section is The shape of the connecting arm is the same as or similar to the shape of the tibial intercondylar eminence.

As another improvement of the above posterior cruciate ligament tibial guide of the present invention, the support is provided with a locking screw hole that communicates with the swing arm slideway, and the locking screw hole is provided with an adjustable arm against the locking bolt.

As another improvement of the posterior cruciate ligament tibial guide of the present invention, the support is provided with an installation hole communicating with the swing arm slideway, and a sleeve is pivotally installed in the installation hole, and the sleeve extends A nut is fixed at one end out of the mounting hole, an inner thread is arranged in the sleeve, and a stud adapted to the inner thread is arranged in the sleeve, and the stud can be connected with the adjusting arm offset.

As another improvement of the posterior cruciate ligament tibial guide of the present invention, the support is provided with an adjustment screw hole that communicates with the guide hole, and the adjustment screw hole is sequentially provided with a jack wire, a spring and a stopper , the two ends of the spring are respectively connected with the top wire and the block, the opposite side of the guide rod and the block is provided with locking grooves distributed along the axial direction of the guide rod, the block The opposite side of the guide rod is provided with protruding teeth matched with the locking groove.

In addition to the technical problems solved by the present invention described above, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions, other technologies that can be solved by the posterior cruciate ligament tibial guide provided by the present invention The problems, other technical features included in the technical solution, and the beneficial effects brought about by these technical features will be described in further detail in the specific embodiments.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

1 is a schematic structural diagram of a posterior cruciate ligament tibial guide provided by an embodiment of the present invention;

Fig. 2 is the structural representation of the support in Fig. 1;

Fig. 3 is the structural schematic diagram of the eccentric positioning swing arm in Fig. 1;

Fig. 4 is a sectional view taken along the direction B-B in Fig. 1;

Fig. 5 is the partial cross-sectional view of C area in Fig. 1;

FIG. 6 is a partial view at D in FIG. 1 .

Description of reference numbers:

1-Support, 2-Guide rod,

3-eccentric positioning swing arm, 4-nut,

5-Sleeve, 6-Top wire,

7-spring, 8-stop,

9- Stud, 10- Standoff Body,

11- Guide hole, 12- Swing arm slideway,

13-Connecting part, 14-Boss part,

15- Pointer, 21- Guide pin slide,

22- Locking groove, 23- Knurled knob,

24-Sawtooth, 31-Adjusting Arm,

32 - connecting arm, 33 - tibial hook,

81-convex, 16-guide pin,

161-positioning part, 321-positioning hole.

Detailed ways

In the process of posterior cruciate ligament reconstruction surgery, the posterior cruciate ligament tibial guide designed according to the center point positioning method is mainly used to determine the attachment point of the posterior cruciate ligament reconstruction on the tibial plateau. For different surgical objects, it is difficult to find an ideal attachment point using the posterior cruciate ligament tibial guide, resulting in poor surgical treatment effect of posterior cruciate ligament reconstruction.

In order to solve the above problems, the embodiment of the present invention provides a posterior cruciate ligament tibial guide designed according to the eccentric positioning method. The posterior side of the posterior cruciate ligament is more conducive to restoring the function of the original ligament and joint stability.” Anatomical findings, the posterior cruciate ligament tibial guide includes a support, a guide rod slidably installed on the support, and an eccentric positioning swing arm. The front end of the arm is provided with a tibial hook. During the reconstruction of the posterior cruciate ligament, the tibial hook at the front end of the eccentrically positioned swing arm is hooked on the back of the tibial plateau, and the set distance from the tibial hook to the intercondylar eminence of the tibial plateau is the posterior cruciate ligament reconstruction in the posterior cruciate ligament. An ideal attachment point on the tibial plateau, thus significantly improving the surgical outcome of posterior cruciate ligament reconstruction.

In order to make the above objects, features and advantages of the embodiments of the present invention more clearly and easily understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

In addition, it should be noted that “proximal or proximal”, “distal or distal”, “anterior”, “posterior”, “medial” and “lateral” used in the following embodiments are all based on anatomy The definition of learning posture and indicating direction, that is, the side facing the human head is called the proximal side, the side facing the feet is called the distal side; the side facing the body is called the front side, and the side facing the body is called the back side. The side is called the posterior side, the center line toward the body is called the inside, and the center line away from the body is called the outside. In addition, although the following embodiments of the present invention are described by taking the knee joint of a human patient as an example, the present invention is not limited to this, that is, the human knee joint provided in the following embodiments of the present invention can also be applied in the knee joints of other animals with the same or similar anatomy.

1-3, the posterior cruciate ligament tibial guide provided by the embodiment of the present invention includes a support 1, a guide rod 2 and an eccentric positioning swing arm 3, wherein the support 1 is provided with a guide hole 11 and a swing arm slideway 12. The guide rod 2 is slidably installed in the guide hole 12, and the guide rod 2 is provided with a guide needle slideway 21 running through its both ends; In the arm slideway 12, the rear end of the connecting arm 32 is connected with the distal guide hole end of the adjusting arm 31, and the front end of the connecting arm 32 is provided with a tibial hook 33 bent to the guide rod 2, and the tibial hook 33 is connected to the axis of the guide rod 2. The vertical distance is 2-7mm.

In specific implementation, the support 1 includes a support body 10, a swing arm support portion 13 and a boss portion 14, wherein the support body 10 is provided with a guide hole 11, and the swing arm support portion 13 and the boss portion 14 are located in the support Both sides of the seat body 10 are connected to the support body 10, and a swing arm slideway 12 is formed on the swing arm support portion 13, on the bottom surface of the swing arm slideway 12 and on the swing arm support portion 13 outside the swing arm slideway There are also a plurality of through holes to reduce the weight of the support 1 . The boss portion 14 is provided, on the one hand, to facilitate holding the posterior cruciate ligament tibial guide during posterior cruciate ligament reconstruction surgery, and on the other hand, to provide the guide rod locking device described below. The above-mentioned support body 10 , the swing arm support portion 13 and the boss portion 14 may be an integral structure formed by casting, or may be machined parts connected together by welding or the like. The support 1 is generally made of stainless steel material, such as precipitation, hardening, martensitic stainless steel (05Cr17Ni4Cu4Nb), so that the support 1 has the characteristics of high strength, hardness and corrosion resistance.

The guide rod 2 is a cylindrical rod, and its interior is provided with a guide needle slideway 21 penetrating both ends of the guide rod 2. The guide needle slideway 21 is used to guide the guide needle 16 used in the reconstruction of the posterior cruciate ligament. in order to have an ideal needle exit point on the tibial plateau. The guide rod 2 is slidably installed in the guide hole 12 , the front end of the guide rod 2 is provided with serrations 24 which are convenient for engaging with the tibia, and the rear end of the guide rod is provided with a knurled knob 23 for adjusting the position of the guide rod 2 in the guide hole 11 . , and the knurled knob 23 is a hollow structure, so that the guide needle 16 can enter the guide needle slideway 21 . The guide rod 2 is generally made of stainless steel, such as precipitation, hardening, martensitic stainless steel (05Cr17Ni4Cu4Nb), so that the guide rod 2 has the characteristics of high strength, hardness and corrosion resistance.

The eccentric positioning swing arm 3 includes an adjusting arm 31 , a connecting arm 32 and a tibial hook 33 , wherein the adjusting arm 31 and the rear end of the connecting arm 32 are connected to form a “sickle” structure. The adjusting arm 31 is installed in the swing arm slideway 12 and can slide in the swing arm slideway 12; , the front end of the connecting arm 32 is connected with the tibial hook 33, and the vertical distance d from the tibial hook 33 to the axis of the guide rod 2 is 2-7 mm. The design mechanism of the eccentrically positioned swing arm 3 is mainly based on the anatomical finding that "the closer the attachment point of the posterior cruciate ligament to the tibial plateau is to the posterior side of the tibial plateau, the more conducive to restoring the function of the original ligament and joint stability"; The attachment point of the posterior cruciate ligament on the tibial plateau is too close to the posterior side of the tibial plateau, and the strength of the tibial tunnel formed therefrom may be insufficient. Therefore, the inventor of the present application determines the distance based on a large amount of clinical experience and the anatomical test of the knee joint. d is generally 2-7 mm, preferably, the vertical distance d from the tibial hook 33 to the axis of the guide rod 2 is 5 mm.

When the above-mentioned posterior cruciate ligament tibial guide is used in posterior cruciate ligament reconstruction surgery, with the help of arthroscope, the front end of the eccentric positioning swing arm 3 is placed into the joint cavity from the back side of the knee joint, and the tibial hook 33 is hooked Hanging on the back side of the tibial plateau, the distance between the rear side of the tibial plateau and the center of the attachment point of the posterior cruciate ligament on the tibial plateau (the needle exit point of the guide pin 16 on the tibial plateau is located at the center of the attachment point of the posterior cruciate ligament) is: 5mm or so. Then, the front serration 24 of the guide rod 2 is pressed against the tibia, and from the rear end of the guide rod 2, the guide pin 16 is inserted into the guide pin slideway 21, and the guide pin 16 is implanted into the tibia with the tip of the guide pin 16. The vertical distance between the needle exit point on the tibial plateau and the tibial hook 33 is 5 mm. According to the guide pin 16, the implantation channel of the posterior cruciate ligament and the attachment point of the posterior cruciate ligament on the tibial plateau are established.

As can be seen from the above description, in the embodiment of the present invention, since the front end of the eccentric positioning swing arm 3 is provided with a tibial hook 33 that is hooked to the rear of the tibial plateau during the posterior cruciate ligament surgery, it can be offset from the rear of the tibial plateau. Move a certain distance to determine the attachment point of the reconstructed posterior cruciate ligament on the tibial plateau. Because the attachment point of the posterior cruciate ligament determined by the posterior cruciate ligament tibial guide is consistent with "the attachment point of the posterior cruciate ligament on the tibial plateau is closer to the posterior side of the tibial plateau, the more conducive to restoring the function of the original ligament and joint stability" Therefore, the attachment point of the posterior cruciate ligament determined by the posterior cruciate ligament tibial guide is ideal, thus significantly improving the surgical treatment effect of posterior cruciate ligament reconstruction.

When the adjusting arm 31 slides in the swing arm slideway 12, the included angle between the connecting arm 32 and the guide rod 2 can be changed. In order to facilitate the adjustment of the included angle, preferably, the swing arm slideway 12 is a circular arc slideway. The adjusting arm 31 is an arc-shaped arm. In addition, in order to allow the operator to observe the angle between the connecting arm 32 and the guide rod 2 more intuitively, in a preferred embodiment, the adjusting arm 31 is provided with a display of the angle between the connecting arm 32 and the guide rod 2 The scale mark on the adjustment arm 31 ranges from 40° to 70°, such as 45°, 50°, 55°... 70° in Fig. 3, and one side edge of the swing arm slideway 12 is provided with The index mark 15 that the scale mark is matched with, the scale mark pointed to by the index mark 15 is the angle between the connecting arm 32 and the guide rod 2. For example, the index mark 15 in FIG. 1 points to 45°, indicating that the connecting arm 32 and the guide rod are The included angle between 2 is 45°.

There are many specific structural forms of the swing arm slideway 12, such as a rectangular slideway, an inverted triangular slideway or a dovetail slideway. Please refer to FIG. 4. In a preferred embodiment, the swing arm slideway 12 is a dovetail slide. The adjustable arm is a trapezoidal slide rail that is adapted to the dovetail slide. This design can prevent the adjusting arm 31 from being detached from the swing arm slideway 12 and improve the guiding accuracy of the swing arm slideway 12 to the adjusting arm 31 .

In order to easily hook the tibial hook 33 to the rear side of the tibial plateau and prevent the connecting arm 32 from shaking, please refer to FIG. 1 and FIG. 3 . In a preferred embodiment, from the front end of the connecting arm 32 to the A section of connecting arm 32 extending from the rear end is bent toward the guide rod 2, and the shape of this section of connecting arm 32 is the same as or similar to the shape of the tibial intercondylar eminence. That is to say, a part of the connecting arm from the front end of the connecting arm 32 is curved, and the degree of bending of this part of the connecting arm is the same as or similar to the degree of the intercondylar bulge of the tibial plateau, so that the tibial hook 33 is hooked to the posterior side of the tibial plateau When, because the shape of the part where the connecting arm 32 contacts with the intercondylar bulge of the tibial plateau is the same or similar to the intercondylar bulge of the tibial plateau, so that the connecting arm 32 can be closely fitted with the intercondylar bulge of the tibial plateau, preventing the connecting arm 32 Shake, so as to determine the ideal needle exit point of the guide pin 16, and then determine the ideal attachment point of the posterior cruciate ligament reconstruction on the tibial plateau.

During the reconstruction of the posterior cruciate ligament, after the angle between the connecting arm 32 and the guide rod 2 is selected, it is generally necessary to lock the angle between the connecting arm 32 and the guide rod 2 . There are many ways to lock the angle between the connecting arm 32 and the guide rod 2. For example, the support 1 is provided with a locking screw hole that communicates with the slideway of the swing arm, and the locking screw hole is provided with an adjustable screw hole. arm against the locking bolt. After the angle between the connecting arm 32 and the guide rod 2 is selected, rotate the locking bolt to the inside of the locking screw hole, so that the locking bolt abuts on the adjusting arm 31, thereby locking the connecting arm 32 and the guide rod 2 angle between. When the locking bolt is rotated to the outside of the locking screw hole, the locking bolt is separated from the adjusting arm 31 , so that the angle between the connecting arm 32 and the guide rod 2 can be locked.

In a preferred embodiment, please refer to FIG. 1 and FIG. 4, the support 1 is provided with a mounting hole communicating with the swing arm slideway 12, the mounting hole is pivoted with a sleeve 5, and the sleeve 5 extends out of the mounting hole. A nut 4 is fixed at one end of the sleeve, an inner thread is arranged in the sleeve 5, and a stud 9 is arranged in the sleeve 5 which is adapted to the inner thread, and the stud 9 can abut against the adjusting arm 31. Specifically, the sleeve 5 is installed in the installation hole of the support 1 and can be rotated relative to its axis in the installation hole. One end of the sleeve 5 protrudes out of the installation hole of the support and is fixedly connected with the nut 4. The nut 4 drives the sleeve 5 to rotate; the inner wall of the sleeve 5 is provided with an internal thread, and the sleeve 5 is provided with a stud 9 that matches the internal thread. When the sleeve 5 rotates, the stud 9 can be adjusted toward or away from The arm 31 moves, for example, when the nut 4 is rotated clockwise, the stud 9 moves toward the adjusting arm 31, and when the stud 9 abuts on the adjusting arm 31, the adjusting arm 31 is locked in the swing arm slideway 12, thereby locking The included angle between the connecting arm 32 and the guide rod 2 . When the nut 4 is rotated counterclockwise, the stud 9 is away from the adjusting arm 31. After the stud 9 is separated from the adjusting arm 31, the adjusting arm 31 can slide in the swing arm slideway 12, so as to contact the connecting arm 32 and the guide rod. The angle between 2 is locked.

Please continue to refer to FIG. 1, the guide rod 2 can slide in the guide hole 11. In order to facilitate the observation of the distance A from the front end of the guide rod 2 to the connecting arm 31, the outer surface of the guide rod 2 is provided with a scale mark along its axial direction, which can be passed through Observe the scale mark on the guide rod 2 exposed from the rear end of the support 1 to determine the value of the distance A from the front end of the guide rod 2 to the connecting arm 31 .

After the distance A from the front end of the guide rod 2 to the connecting arm 31 is determined, it is generally necessary to lock the guide rod 2 in the guide hole 11 . In a preferred embodiment, please refer to FIG. 1 and FIG. 5, the support 1 is provided with an adjustment screw hole communicating with the guide hole 11, and the adjustment screw hole is sequentially provided with a jack screw 6, a spring 7 and a stopper 8, Both ends of the spring 7 are connected with the top wire 6 and the stopper 8 respectively. The opposite side of the guide rod 2 and the stopper 8 is provided with a locking groove 22 distributed along the axial direction of the guide rod 2. There are protruding teeth 81 that cooperate with the locking groove 22 . Specifically, the top screw 6, the spring 7 and the stopper 8 are arranged in the adjusting screw hole, wherein the top screw 6 is located at the outermost side and is threadedly matched with the adjusting screw hole, the stopper 8 is located at the innermost side, and the spring 7 is located at the top screw 6 and the stopper 8, and the two ends are respectively connected with the top wire 6 and the stopper 8. When the jack screw 6 is rotated to the inside of the adjusting screw hole, the spring 7 transmits the pressure of the jack screw 6 to the inside of the adjusting screw hole to the stopper 8, and the stopper 8 moves toward the guide rod 2 until the convex teeth 81 of the stopper 8 and the guide The locking groove 22 of the rod 2 is engaged, so that the guide rod 2 is locked in the guide hole 11 . When the top screw 6 is rotated to the outside of the adjusting screw hole, the stopper 8 moves away from the guide rod 2 until the protruding teeth 81 of the stopper 8 are separated from the locking groove 22 of the guide rod 2 , thereby unlocking the guide rod 2 . It should be noted that the spring 7 is used to relieve the pressure of the top wire 6 on the stopper 8, so as to avoid excessive pressure of the stopper 8 on the guide rod 2 and damage to the guide rod 2 or deformation of the guide rod 2, so as to improve the service life of the guide rod.

It should be added that the nut 4, the sleeve 5, the top screw 6, the stopper 8 and the stud 9 in the above embodiments are all made of stainless steel, such as precipitation, hardening, martensitic stainless steel (05Cr17Ni4Cu4Nb) Made to provide the above-mentioned components with high strength, hardness and corrosion resistance. In addition, the spring 7 is generally made of 302 stainless steel, so that the spring has better elasticity; the eccentric positioning swing arm 3 can be selected from martensitic stainless steel, such as 32Cr13Mo, so that the eccentric positioning swing arm 3 has high strength and corrosion resistance.

6 is a partial view of D in FIG. 1 , please refer to FIG. 6 , the guide needles 16 all include a positioning portion 161 formed at the end of the guide needle 16 , and a positioning hole 321 is correspondingly provided on the connecting arm 32 . The positioning portion 161 at the end of the needle 16 can be inserted into the positioning hole 321 , so that the guide needle 16 can be accurately positioned. Further, the connecting arm 32 has a positioning surface, and the positioning hole 321 is opened on the positioning surface.

The embodiments or implementations in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments may be referred to each other.

In the description of this specification, reference to the terms "one embodiment," "some embodiments," "exemplary embodiment," "example," "specific example," or "some examples", etc., is meant to incorporate the embodiments A particular feature, structure, material, or characteristic described or exemplified is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features thereof can be equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention. scope.

Claims (10)

1. A posterior cruciate ligament tibial guide, comprising:

the support is provided with a guide hole and a swing arm slideway;

the guide rod is slidably arranged in the guide hole, and a guide pin slideway penetrating through two ends of the guide rod is arranged in the guide rod;

eccentric location swing arm with regulating arm and linking arm, the regulating arm slidable mounting be in the swing arm slide, the rear end of linking arm with the far guide hole end of regulating arm is connected, the front end of linking arm is equipped with the bending to the shin bone couple of guide bar, the shin bone couple arrives the perpendicular distance of the axis of guide bar is 2-7 mm.

2. The posterior cruciate ligament tibial guide of claim 1, wherein the tibial hook is 5mm perpendicular to the axis of the guide rod.

3. The posterior cruciate ligament tibial guide of claim 1, wherein the swing arm slide is a circular arc shaped slide and the adjustment arm is a circular arc shaped arm.

4. The posterior cruciate ligament tibial guider according to claim 3, wherein the adjusting arm is provided with a scale mark for displaying an included angle between the connecting arm and the guide rod, and one side edge of the swing arm slideway is provided with a direction mark matched with the scale mark.

5. The posterior cruciate ligament tibial guide of claim 4, wherein the scale markings on the adjustment arm range from 40 ° -70 °.

6. The posterior cruciate ligament tibial guide of claim 1, wherein the swing arm slide is a dovetail slide and the adjustment arm is a trapezoidal slide that fits the dovetail slide.

7. The posterior cruciate ligament tibial guide of claim 1, wherein a section of the connecting arm extending from the anterior end of the connecting arm to the posterior end of the connecting arm curves toward the guide rod and has a shape that is the same as or similar to the shape of the tibial intercondylar eminence.

8. The posterior cruciate ligament tibial guide of any one of claims 1-7, wherein the support is provided with a locking screw hole communicated with the swing arm slideway, and a locking bolt capable of abutting against the adjusting arm is arranged in the locking screw hole.

9. The posterior cruciate ligament tibial guider according to any one of claims 1-7, wherein the support is provided with a mounting hole communicated with the swing arm slideway, a sleeve is pivotally installed in the mounting hole, a nut is fixedly arranged at one end of the sleeve extending out of the mounting hole, an internal thread is arranged in the sleeve, a stud matched with the internal thread is arranged in the sleeve, and the stud can be abutted against the adjusting arm.

10. The posterior cruciate ligament tibial guider according to claim 1, wherein the support is provided with an adjusting screw hole communicated with the guide hole, a jackscrew, a spring and a stop block are sequentially arranged in the adjusting screw hole, two ends of the spring are respectively connected with the jackscrew and the stop block, locking grooves axially distributed along the guide rod are arranged on the opposite sides of the guide rod and the stop block, and convex teeth matched with the locking grooves are arranged on the opposite sides of the stop block and the guide rod.

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