Absorbable implant for anterior cruciate ligament reconstruction of knee joint
By designing a resorbable internal implant for reconstruction of the anterior cruciate ligament of knee, the problems of femoral injury and postoperative complications during reconstruction of the anterior cruciate ligament of knee in the prior art are solved, and a safer and more effective ligament reconstruction effect is achieved.
Patent Information
- Application Number
- CN202420983956.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-08
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-05-08
AI Technical Summary
In the reconstruction of the anterior cruciate ligament of the knee joint, multiple through holes are needed to assist in fixing the tendon, resulting in increased femoral damage and difficult to remove after fixing the loop steel plate, which may cause postoperative infection and pain and other complications.
An absorbable inner plant is designed, including an integrally formed body part, a fixing part and an operating part, and the fixing part and the operating part are arranged at the axial distance of the body part and are connected to the body part. The inner plant is equipped with a receiving groove extending axially in the surface of the body, for receiving and fixing the tendons, so that they form stable fixation in the femur without further opening of through holes.
By reducing damage to the femur, the increased risk of surgical procedures in traditional techniques is avoided, and the risk of postoperative infection and pain is avoided through absorbable materials.
Smart Images
Figure CN222584562U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of medical devices, and in particular to an absorbable implant for reconstruction of anterior cruciate ligament of knee joint. Background Art
[0002] The anterior cruciate ligament (ACL), also known as the anterior cruciate ligament, is an important ligament in the knee joint. The anterior cruciate ligament is located in the knee joint, starting from the medial side of the lateral condyle of the femur, obliquely forward and downward, and ending at the front of the intercondylar eminence of the tibia and the anterior corners of the medial and lateral menisci, connecting the femur and tibia. The anterior cruciate ligament is composed of fibrous tissue and has strong tensile strength. It plays an important role in the stability and function of the knee joint.
[0003] Anterior cruciate ligament injury can lead to knee instability, knee pain, knee synovitis, and even osteoarthritis. To this end, the prior art uses anterior cruciate ligament reconstruction technology, which opens through implantation tunnels on the femur and tibia, implants the tendon between the femur and tibia through the tunnels, and uses a steel plate with loops to fix the two ends of the tendon to the outer cortex of the femur and tibia respectively (refer to Figure 1 As shown in the figure, the purpose of reconstructing the anterior cruciate ligament and restoring the stability of the knee joint is achieved. However, when the plate with loops is fixed, the tendon needs to pass through the femur to reach the outer cortex for fixation, and two opposite through holes that penetrate the bone layer need to be opened on the femur. During the operation, the femur will be greatly damaged, increasing the risk of surgery. Secondly, the plate with loops cannot be removed even after the bone fusion in the later stage. Long-term retention in the body may cause complications such as infection and pain.
[0004] In view of the above, the present utility model is proposed. Utility Model Content
[0005] The present application provides an absorbable implant for reconstruction of the anterior cruciate ligament of the knee joint, aiming to solve or at least alleviate the defects existing in the above-mentioned anterior cruciate ligament reconstruction.
[0006] The present application provides an absorbable implant for reconstruction of the anterior cruciate ligament of the knee joint. The absorbable implant includes an integrally formed main body, a fixing part and an operating part; the fixing part and the operating part are arranged at two ends of the main body along the axial direction of the main body and are connected to the main body; at least two first receiving grooves extending axially are opened on the surface of the main body, and the two first receiving grooves are arranged at intervals along the radial direction of the main body, and the two ends of each first receiving groove respectively pass through the fixing part and the operating part, and the receiving groove is used to accommodate and fix the tendon.
[0007] In some embodiments, a second receiving groove is formed on the fixing portion, and two ends of the second receiving groove are respectively connected to the first receiving groove to cooperate with the first receiving groove to fix the tendon.
[0008] In some embodiments, a positioning hole extending in the axial direction is provided on the operating portion for receiving an external guiding force.
[0009] In some embodiments, a plurality of protrusions are disposed on the surface of the main body, and the plurality of protrusions are arranged at intervals along the axial direction; the plurality of protrusions all protrude from the main body along the radial direction of the main body; and the first receiving groove is opened on the protrusion along the axial direction.
[0010] In some embodiments, the outer edge of the protrusion transitions into an arc shape.
[0011] In some embodiments, a thread extending and rotating along the axial direction is provided on the surface of the main body, two ends of the thread are respectively connected to the operating part and the fixing part, and the first receiving groove is opened on the thread along the axial direction.
[0012] In some embodiments, the first receiving groove is an arc-shaped groove.
[0013] In some embodiments, both ends of the first receiving groove along the width direction transition along an arc shape.
[0014] In some embodiments, the length of the absorbable implant is 46-52 mm; and / or the diameter of the absorbable implant is 4-6 mm.
[0015] In some embodiments, the absorbable implant is made of any one of polyetheretherketone, polylactide or polycaprolactone.
[0016] Compared with the prior art, the absorbable implant for reconstruction of the anterior cruciate ligament of the knee provided by the present application has at least the following beneficial effects:
[0017] The absorbable implant provided by the present application is designed through structural optimization. The absorbable implant includes an integrally formed main body, a fixing part and an operating part. The fixing part and the operating part are arranged at two ends of the main body along the axial direction of the main body and are connected to the main body. At least two first receiving grooves extending in the axial direction are opened on the surface of the main body. The two first receiving grooves are arranged at radial intervals along the main body. The two ends of each first receiving groove pass through the fixing part and the operating part respectively, so that the tendon can be fixed in the first receiving groove by being accommodated, and fixed on the absorbable implant in cooperation with the fixing part, so that when reconstructing the anterior cruciate ligament of the knee joint, it is only necessary to insert the absorbable implant with the tendon fixed into the femur through the opening on the femur to form fixation of the tendon at one end of the femur, without further opening a through hole in the femur to assist fixation with the help of the lateral cortex of the femur, thereby greatly reducing damage to the femur. In addition, the absorbable implant has good biocompatibility and can be gradually absorbed and degraded by the human body, avoiding the risks of complications such as postoperative infection and pain brought about by the traditional fixation method of the steel plate with loops. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the specific implementation of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific implementation or the prior art description. Obviously, the drawings described below are some implementations of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.
[0019] Figure 1 A schematic diagram of tendon fixation in the prior art;
[0020] Figure 2 A schematic diagram of the overall structure of the absorbable implant provided in the embodiment of the present application;
[0021] Figure 3 A schematic diagram of the overall structure of the absorbable implant provided in the embodiment of the present application;
[0022] Figure 4 A schematic diagram of the structure of the fixing part provided in the embodiment of the present application;
[0023] Figure 5 A schematic diagram of the structure of the operating unit provided in the embodiment of the present application;
[0024] Figure 6 A schematic diagram of an absorbable implant for fixing a tendon provided in an embodiment of the present application.
[0025] The reference numerals are as follows:
[0026] 10. absorbable implant; 20. femur; 30. tibia; 40. tendon;
[0027] 100, main body; 110, first receiving groove; 120, protruding portion;
[0028] 200, fixing portion; 210, second receiving groove;
[0029] 300, operating part; 310, positioning hole. DETAILED DESCRIPTION
[0030] In the description of the present application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like appear to indicate the orientation or position relationship, unless otherwise specified, they are understood to be based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application.
[0031] In addition, if there is a feature defined as "first" or "second", it is only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Features defined as "first" or "second" may explicitly or implicitly include at least one of the defined features. If there is a description of "plurality", the general meaning is to include at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0032] In this application, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed" and so on should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection, it can be a direct connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.
[0033] In the description of this specification, if the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" appear, it means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.
[0034] The general concept of the embodiment of the present application is to provide an absorbable implant 10 for reconstruction of the anterior cruciate ligament of the knee joint. Through the structural design of the absorbable implant 10, the absorbable implant 10 can accommodate and fix the tendon 40, so that the tendon 40 is placed into the femur 20 together with the absorbable implant 10 and fixed in the femur 20, thereby avoiding the greater damage caused by the need to open too many through holes in the femur 20 in the traditional technology; in addition, the absorbable implant 10 can be gradually absorbed and degraded by the human body, avoiding the risks of complications such as postoperative infection and pain brought about by the traditional fixation method of the steel plate with loops.
[0035] Based on the above general concept, reference Figure 2 to Figure 6 As shown, the embodiment of the utility model first provides an absorbable implant 10 for reconstruction of the anterior cruciate ligament of the knee joint. The absorbable implant 10 includes an integrally formed main body portion 100, a fixing portion 200 and an operating portion 300; the fixing portion 200 and the operating portion 300 are arranged at both ends of the main body portion 100 along the axial direction of the main body portion 100 and are connected to the main body portion 100; at least two first receiving grooves 110 extending axially are opened on the surface of the main body portion 100, and the two first receiving grooves 110 are arranged at intervals along the radial direction of the main body, and the two ends of each first receiving groove 110 respectively pass through the fixing portion 200 and the operating portion 300, and the receiving groove is used to accommodate the fixed tendon 40.
[0036] It should be understood that in this embodiment, the first receiving groove 110 on the main body 100 is used to accommodate the tendon 40. Since the two first receiving grooves 110 are arranged at intervals along the radial direction of the main body, the tendon 40 can pass through one of the first receiving grooves 110, be sleeved on the fixing part 200, and extend through the other first receiving groove 110. The first receiving groove 110 cooperates with the fixing part 200 to fix the tendon 40 on the absorbable implant 10. Since the two ends of the first receiving groove 110 respectively pass through the fixing part 200 and the operating part 300, the tendon 40 can be implanted into the femur 20 with the absorbable implant 10. When the tendon 40 is inserted through the through hole on the femur 20, the bone layer on the inner wall of the through hole is not damaged; and the design of the operating part 300 allows external auxiliary equipment to apply force to implant the absorbable implant 10 loaded with the tendon 40 into the femur 20 through the through hole opened in the femur 20, so as to fix the tendon 40 inside the femur 20; thus, there is no need to open additional through holes on the femur 20 for fixation, which greatly reduces the damage to the femur 20 during the operation, and the absorbable implant 10 can gradually degrade in the femur 20 over time, avoiding complications such as infection and pain caused by long-term retention in the femur 20.
[0037] Furthermore, in this embodiment, the integrally formed main body portion 100, fixing portion 200 and operating portion 300 ensure the overall strength and stability of the absorbable implant 10, reduce stress concentration and fracture risks caused by component connections, and improve safety during surgery.
[0038] It should be noted that, in some embodiments, the number of the first receiving grooves 110 may also be designed to be three or four to meet different fixation requirements of the tendon 40 .
[0039] refer to Figure 4 In an optional embodiment of the present application, a second receiving groove 210 is provided on the fixing portion 200, and both ends of the second receiving groove 210 are respectively connected to the first receiving groove 110 to cooperate with the first receiving groove 110 to fix the tendon 40. Since both ends of the second receiving groove 210 are respectively connected to the first receiving groove 110, the tendon 40 can be further embedded in the second receiving groove 210 when located on the fixing portion 200 to improve the stability of the tendon 40 on the absorbable implant 10; in addition, the two ends of the second receiving groove 210 are respectively connected to the first receiving groove 110, which is also beneficial for the tendon 40 to avoid being damaged by the inner wall of the through hole of the femur 20 when passing through the through hole on the femur 20.
[0040] refer to Figure 5 In an optional embodiment of the present application, a positioning hole 310 extending in the axial direction is provided on the operating portion 300 for receiving an external guiding force. The operating portion 300 in this embodiment is mainly used to receive an external guiding force, and the design of the positioning hole 310 facilitates an external auxiliary device to apply a guiding force toward the preset through hole of the femur 20, so as to accurately place the absorbable implant into the femur 20 through the through hole on the femur 20.
[0041] refer to Figure 2 and Figure 3 In order to improve the stability of the absorbable internal component in the femur 20, in an optional embodiment of the present application, a plurality of protrusions 120 are provided on the surface of the main body 100, and the plurality of protrusions 120 are arranged at intervals along the axial direction; the plurality of protrusions 120 all protrude from the main body 100 along the radial direction of the main body 100; and the first receiving groove 110 is opened on the protrusion 120 along the axial direction.
[0042] In this embodiment, the first receiving groove 110 is provided on the protrusion 120, so that after the tendon 40 is embedded in the first receiving groove 110, in the process of passing through the bone layer, it is mainly the protrusion 120 that contacts the inner wall of the through hole on the femur 20, rather than the tendon 40 contacting the inner wall of the through hole of the femur 20, so as to reduce the risk of damage to the tendon 40 during the operation; what is particularly critical is that multiple protrusions 120 all protrude from the main body 100 in the radial direction of the main body 100, and multiple protrusions 120 can increase the contact area between the absorbable implant and the bone tissue in the femur 20, thereby greatly improving the stability of the absorbable implant 10, making it not easy to fall out of the femur 20.
[0043] In an optional embodiment of the present application, the outer edge of the protrusion 120 is in an arc-shaped transition. By designing the outer edge of the protrusion 120 as an arc-shaped transition, the stimulation and damage of the protrusion 120 to the tissue around the through hole of the femur 20 during the implantation process can be reduced, making the implantation process smoother and reducing the patient's postoperative discomfort.
[0044] In some embodiments of the present application, the surface of the main body 100 may also be designed with a thread that rotates and extends along the axial direction to replace the above-mentioned protrusion 120, and the two ends of the thread are respectively connected to the operating part 300 and the fixing part 200, and the first receiving groove 110 is axially opened on the thread. In this embodiment, the design of the thread on the surface of the main body 100 can make it easier to implant the absorbable implant 10 into the femur 20 by rotating the thread, thereby improving the convenience and efficiency of the operation, and also helping to provide additional fixing force.
[0045] In an optional embodiment of the present application, the first receiving groove 110 and the second receiving groove 210 are both arc-shaped grooves. Since the functions of the first receiving groove 110 and the second receiving groove 210 are to accommodate and fix the tendon 40, designing the first receiving groove 110 and the second receiving groove 210 as arc-shaped grooves can be more in line with the natural shape of the tendon 40, improve the adaptability of the absorbable implant 10 and the tendon 40, so as to better accommodate and fix the tendon 40 and reduce the distortion and damage of the tendon 40.
[0046] In an optional embodiment of the present application, both ends of the first receiving groove 110 along the width direction transition along an arc shape. It can be understood that when the tendon 40 is thicker, the tendon 40 is easy to protrude from the first receiving groove 110 and contact the groove edge of the first receiving groove 110. By designing both ends of the first receiving groove 110 along the width direction to transition along an arc shape, the friction and damage of the tendon 40 in the first receiving groove 110 can be further reduced, thereby improving the comfort and healing effect of the tendon 40.
[0047] In an optional embodiment of the present application, the length of the absorbable implant is 46-52 mm; and / or the diameter of the absorbable implant 10 is 4-6 mm. The length of the absorbable implant provided in this embodiment is 46-52 mm. For example, the absorbable implant can be 46 mm, 48 mm, 50 mm, 52 mm or any length value within the range of 46-52 mm; the diameter of the absorbable implant 10 is 4-6 mm. For example, the absorbable implant can be 4 mm, 4.5 mm, 5.0 mm, 5.5 mm, 6.0 mm or any diameter within the range of 4-6 mm; the absorbable implant can be designed with different specifications and models. In specific application scenarios, the appropriate length of the implant can be selected according to the specific needs of different patients, so that the absorbable implant 10 is more flexible, accurate and personalized, thereby helping to improve the success rate of the operation, reduce the incidence of complications, and also improve the comfort and satisfaction of patients.
[0048] In an optional embodiment of the present application, the absorbable implant 10 is made of any one of polyetheretherketone, polylactide or polycaprolactone. The absorbable implant 10 is made of the above materials, which can make the absorbable implant 10 have good biocompatibility and degradability, can be gradually absorbed in the body, reduce the risk of complications of long-term implantation, and promote the patient's recovery.
[0049] Therefore, if Figure 6 As shown, the absorbable implant 10 provided in the embodiment of the present application can, during the application process, first place the tendon 40 into at least two first receiving grooves 110 on the main body 100 for fixation, and further, by opening a through hole at one end of the femur 20 facing the tibia 30, the operating portion 300 of the absorbable implant 10 can, under the action of an external auxiliary device, drive the absorbable implant 10 with the tendon 40 fixed thereto through the through hole into the bone tissue in the femur 20 to form a stable fixation in the femur 20.
[0050] In summary, the absorbable implant 10 provided in the embodiment of the present application is designed through optimization of the structure. The absorbable implant 10 includes an integrally formed main body 100, a fixing part 200 and an operating part 300. The fixing part 200 and the operating part 300 are arranged at both ends of the main body 100 along the axial direction of the main body 100 and are connected to the main body 100; wherein, at least two first receiving grooves 110 extending toward the axial direction are opened on the surface of the main body 100, and the two first receiving grooves 110 are arranged at intervals along the radial direction of the main body, and the two ends of each first receiving groove 110 respectively pass through the fixing part 200 and the operating part 300, thereby, the tendon 40 can be received by the fixing part 200 and the operating part 300. It is fixed in the first receiving groove 110 and is fixed on the absorbable implant 10 in conjunction with the fixing part 200, so that when the anterior cruciate ligament of the knee joint is reconstructed, it is only necessary to insert the absorbable implant 10 with the tendon 40 fixed thereon into the femur 20 through the opening on the femur 20 to fix the tendon 40 at one end of the femur 20, without further opening a through hole in the femur 20 to assist in fixation with the help of the lateral cortex of the femur 20, thereby greatly reducing damage to the patient; and the absorbable implant 10 has good biocompatibility and can be gradually absorbed and degraded by the human body, thereby avoiding the risks of complications such as postoperative infection and pain brought about by the traditional fixation method of a steel plate with a loop.
[0051] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Those skilled in the art can change, modify, replace and modify the above embodiments within the scope of the present application.
Claims
1. An absorbable implant for reconstruction of the anterior cruciate ligament of the knee joint, characterized in that: The absorbable implant comprises an integrally formed main body, a fixing portion and an operating portion; The fixing portion and the operating portion are arranged at two ends of the main body portion at intervals along the axial direction of the main body portion, and are connected to the main body portion; The surface of the main body is provided with at least two first receiving grooves extending toward the axial direction, the two first receiving grooves are arranged at intervals along the radial direction of the main body, the two ends of each first receiving groove respectively pass through the fixing part and the operating part, and the receiving groove is used to accommodate and fix the tendon.
2. The absorbable implant according to claim 1, characterized in that: The fixing portion is provided with a second receiving groove, and two ends of the second receiving groove are respectively communicated with the first receiving groove to cooperate with the first receiving groove to fix the tendon.
3. The absorbable implant according to claim 2, characterized in that: The operating portion is provided with a positioning hole extending along the axial direction for receiving an external guiding force.
4. The absorbable implant according to claim 2, characterized in that: The surface of the main body is provided with a plurality of protrusions, and the plurality of protrusions are arranged at intervals along the axial direction; The plurality of protrusions all protrude from the main body along the radial direction of the main body; The first receiving groove is opened on the protruding portion along the axial direction.
5. The absorbable implant according to claim 4, characterized in that: The outer edge of the protrusion is in an arc-shaped transition.
6. The absorbable implant according to claim 2, characterized in that: The surface of the main body is provided with a thread that rotates and extends along the axial direction, two ends of the thread are respectively connected to the operating part and the fixing part, and the first receiving groove is opened on the thread along the axial direction.
7. The absorbable implant according to any one of claims 1 to 6, characterized in that: The first receiving groove is an arc-shaped groove.
8. The absorbable implant according to claim 7, characterized in that: Both ends of the first receiving groove along the width direction are transitioned along an arc shape.
9. The absorbable implant according to claim 7, characterized in that: The absorbable implant has a length of 46 to 52 mm; and / or The diameter of the absorbable implant is 4 to 6 mm.
10. The absorbable implant according to claim 7, characterized in that: The absorbable implant is made of any one of polyetheretherketone, polylactide or polycaprolactone.