Assembled artificial knee joint tibia support assembly

Abstract

The utility model belongs to the field of medical instruments, and particularly relates to an assembled artificial knee joint tibia support assembly which comprises a tibia support body and at least one tibia support extension rod. The tibia support extension rod is connected with the tibia support body through a thread structure or a tenon-and-mortise structure; when more than two tibia support extension rods are arranged, the adjacent tibia support extension rods are connected through a thread structure or a tenon-and-mortise structure; the length of the tibia support extension rod is not smaller than 2 cm and smaller than 30 cm. Compared with the prior art, the utility model solves the problems that the tibia support extension rod in the prior art is a standard part, the length, the angle, the shape and the like cannot be adjusted according to the needs of a patient, and the bone needs to be cut to adapt to the tibia support extension rod; according to the scheme, the tibia support extension rod can be individually adjusted according to the condition of a patient through an assembled structure, and the condition that a cut bone is matched with the tibia support extension rod can be avoided to a great extent.

Description

Technical Field

[0001] The utility model belongs to the field of medical equipment, and in particular relates to a modular artificial knee joint tibial support component. Background Art

[0002] Knee replacement surgery is a common joint surgery used to treat serious knee diseases such as osteoarthritis, rheumatoid arthritis or post-traumatic joint injuries, which can effectively improve patients' mobility and quality of life. In this type of surgery, the damaged or diseased knee joint surface is removed and replaced with an artificial joint to restore the function of the joint and relieve pain.

[0003] In the prior art, the tibial tray of the artificial knee joint is a key component used to replace or repair damaged knee joint tissue. However, the traditional artificial knee joint design is limited in some aspects. It is usually fixed in size and shape, which limits its adaptability and scope of use, especially in terms of flexibility in adapting to different patient anatomical structures.

[0004] In traditional tibial tray design, an extension rod with a fixed length and diameter is usually used. This design requires the doctor to precisely cut the patient's knee bone during surgery to ensure that the extension rod can adapt. However, this process not only increases the difficulty and time of the operation, but also increases the trauma and recovery time of the patient; and the shape and size of each patient's knee joint are different, and the existing tibial trays and extension rods often cannot perfectly adapt to all patients. This "one-size-fits-all" solution may lead to unsatisfactory surgical results for some patients, such as joint instability, limited range of motion, or persistent pain. For some special cases, such as patients with osteoporosis or bone defects, standard-sized tibial trays may not be applicable, mainly because fixed-size extension rods may not provide adequate support and stability for patients with osteoporosis or bone defects.

[0005] In addition, the existing extension rods with completely fixed sizes also have problems in warehousing and logistics. Hospitals need to stock extension rods of various sizes to meet the needs of different patients, which increases inventory costs and management difficulties. During surgery, due to the limitations of the extension rod size, doctors need to compromise with limited choices, which may also affect the surgical effect and the patient's postoperative recovery.

[0006] Therefore, in order to solve the above problems, it is necessary to further improve the existing tibial tray and extension rod so that they can have good adaptability when used for different patients. Utility Model Content

[0007] The purpose of the present utility model is to provide a modular artificial knee joint tibial tray assembly in order to solve at least one of the above problems, so as to solve the problem that in the prior art, tibial tray extension rods are all standard parts, and the length, angle, shape, etc. cannot be adjusted according to the needs of the patient, and bone cutting is required to adapt to the tibial tray extension rod; this solution achieves personalized adjustment of the tibial tray extension rod according to the patient's condition through a modular structure, which can greatly avoid the situation of bone cutting to adapt to the tibial tray extension rod.

[0008] The purpose of the utility model is achieved through the following technical solutions:

[0009] A modular artificial knee joint tibial tray assembly comprises a tibial tray body and at least one tibial tray extension rod;

[0010] The tibial tray extension rod is connected to the tibial tray body via a threaded structure or a mortise and tenon structure;

[0011] When the tibial tray extension rod is provided with more than two sections, adjacent tibial tray extension rods are connected by a threaded structure or a mortise and tenon structure;

[0012] The length of the tibial support extension rod is not less than 2 cm and less than 30 cm.

[0013] Extension rods of various lengths can be combined and used to facilitate combination according to the actual situation of the patient's tibia, avoiding the situation of bone cutting to adapt to the extension rod to the greatest extent, reducing the patient's pain and unnecessary injuries; the threaded structure or the mortise and tenon structure can achieve fast and convenient disassembly and assembly, so as to compare and confirm the optimal combination method, and at the same time shorten the time consumption of the disassembly and assembly process, thereby shortening the operation time.

[0014] When a threaded structure is used, the lower connecting end of the tibial tray body and the tibial tray extension rod is usually an internal thread, and the upper end of the tibial tray extension rod is an external thread, which can ensure that the lower end of the tibial tray extension rod at the end is an internal thread, avoiding the external thread from causing internal wear or irritation to the normal tibia; similarly, when a mortise and tenon structure is used, the lower connecting end of the tibial tray body and the tibial tray extension rod is usually an inward-recessed female end, and the upper end of the tibial tray extension rod is an outward-convex male end, which can ensure that the lower end of the tibial tray extension rod at the end is an inward-recessed female end, avoiding the convex male end from causing internal wear or irritation to the normal tibia. At the same time, the internal thread and the inward-recessed female end also provide a certain internal rough structure for cell growth and attachment.

[0015] Preferably, the tibial support extension rod is a columnar structure or a frustum-shaped structure.

[0016] Preferably, the tibial support extension rod is a hollow structure or an inner support structure. The inner support structure can be used for cells to cling to, thereby increasing the degree of binding firmness and the structural strength of the tibia part.

[0017] Preferably, the inner support structure is a support rod arranged inside the tibial support extension rod.

[0018] Preferably, the side wall of the tibial tray extension rod is opened in the height direction to provide a growth space for cells after the extension rod is inserted into the tibia, so that the cells can grow alternately inside and outside the tibial tray extension rod to further improve the bonding degree.

[0019] Preferably, the diameter of the tibial support extension rod is 5-40 mm. When a frustum-shaped structure is used, the upper and lower diameters are different, and a suitable slope is selected according to the patient's tibia condition.

[0020] Preferably, the tibial tray extension rod is made of biomedical metal or biomedical plastic.

[0021] Preferably, the biomedical metal is medical stainless steel, titanium alloy, tantalum metal, tantalum alloy or cobalt-chromium-molybdenum alloy.

[0022] Preferably, the tantalum alloy is a titanium-tantalum alloy or a titanium substrate provided with a tantalum coating.

[0023] Preferably, the surface of the tibial support extension rod is provided with a surface micro-nano structure, which provides a certain degree of roughness to facilitate cell attachment.

[0024] Preferably, the surface of the tibial tray extension rod is coated with a bioactive substance layer.

[0025] The working principle of the utility model is:

[0026] When in use, the tibial tray body and a suitable tibial tray extension rod can be reasonably assembled according to the specific conditions of the patient's knee joint, and a tibial tray of matching shape and size can be assembled through reliable connection with threads or mortise and tenon joints to avoid bone cutting for the patient.

[0027] Compared with the prior art, the utility model has the following beneficial effects:

[0028] The modular extension rod of the utility model provides a flexible and economical solution, allowing doctors to customize knee replacement surgery according to the specific needs of patients, thereby improving the success rate of surgery and the comfort of patients. The extension rod is designed with a unique internal and external thread or mortise and tenon structure, which enables it to fit tightly with the end of the tibial support intramedullary rod. The length of the extension rod can range from 2 cm to 30 cm, and the diameter is about 5 mm to 40 mm, to meet the specific needs of different patients. This design allows the extension rod of appropriate length to be selected according to the specific situation of the patient during surgery, thereby greatly reducing the difficulty of surgery and the cost of equipment.

[0029] In addition, the modular extension rod is designed with long-term use in mind. As it can precisely match the patient's knee joint, this extension rod can reduce the mismatch between the implant and the bone, thereby reducing possible complications such as prosthesis loosening or wear during long-term use. This is of great significance for improving the patient's quality of life and reducing the need for secondary surgery in the future.

[0030] Furthermore, modular extension rods also provide hospitals with greater economic benefits. By reducing the need for multiple extension rods of different sizes, hospitals can reduce inventory costs and management complexity, while reducing medical waste and having a positive impact on the environment.

[0031] Therefore, the introduction of the modular extension rod not only solves multiple problems in traditional technology, but also brings patients a truly personalized treatment plan, which is a very important advancement in the modern medical field. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of the structure of a modular artificial knee joint tibial tray component when the columnar extension rod is used;

[0033] Figure 2 A schematic diagram of the structure of a modular artificial knee joint tibial tray component when the rod is a cone-shaped extension rod;

[0034] Figure 3 A schematic diagram of the structure of a hollow cylindrical tibial tray extension rod with a threaded connection structure;

[0035] In the figure: 1-tibial tray body; 2-tibial tray extension rod. DETAILED DESCRIPTION

[0036] The utility model is described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] Example 1

[0038] A modular artificial knee joint tibial tray component, such as Figure 1 , 3 As shown, it includes a tibial tray body 1 and at least one tibial tray extension rod 2;

[0039] The tibial tray extension rod 2 is connected to the tibial tray body 1 via a threaded structure or a mortise and tenon structure;

[0040] When the tibial tray extension rod 2 is provided with more than two sections, adjacent tibial tray extension rods 2 are connected by a threaded structure or a mortise and tenon structure;

[0041] The length of the tibial support extension rod 2 is not less than 2 cm and less than 30 cm.

[0042] More specifically, in this embodiment:

[0043] The assembly is composed of an existing tibial tray body 1 and at least one assembleable tibial tray extension rod 2, wherein the first tibial tray extension rod 2 is tightly matched with the end of the tibial tray intramedullary rod on the tibial tray body 1 through a threaded structure or a mortise and tenon structure, and the subsequent two adjacent tibial tray extension rods 2 are also connected to each other through a threaded structure or a mortise and tenon structure. This design allows doctors to easily, quickly and firmly connect the extension rod and the tibial tray according to surgical needs, as well as add, reduce or replace the extension rod, while also ensuring the reliability and stability of the overall structure.

[0044] When adopting the threaded structure, the lower connecting end of the tibial support body 1 and the tibial support extension rod 2 can usually be an internal thread, and the upper end of the tibial support extension rod 2 can be an external thread, which can ensure that the lower end of the tibial support extension rod 2 at the end is an internal thread, avoiding the external thread from causing internal wear or stimulation to the normal tibia; similarly, when adopting the mortise and tenon structure, the lower connecting end of the tibial support body 1 and the tibial support extension rod 2 can usually be an inward-recessed female end, and the upper end of the tibial support extension rod 2 can be a convex male end, which can ensure that the lower end of the tibial support extension rod 2 at the end is an inward-recessed female end, avoiding the convex male end from causing internal wear or stimulation to the normal tibia. At the same time, the internal thread and the inward-recessed female end also provide a certain internal rough structure for cell growth and attachment.

[0045] The tibial support extension rod 2 can be designed to have a length ranging from 2 cm to 30 cm and a diameter of about 5 mm to 40 mm to meet the specific needs of different patients. This design allows the extension rod of a suitable length to be selected and assembled according to the specific conditions of the patient during surgery. Figure 1 As shown, a columnar (hollow column) tibial tray extension rod 2 is used. At the same time, the hollow structure can effectively reduce the overall weight of the tibial tray extension rod 2, and also provide more space for new bone growth, thereby strengthening the combination between the implant and the bone. In some embodiments, the interior of the tibial tray extension rod 2 is also designed as an internal support structure, and a horizontal support (support rod) is spanned inside, which can provide new bone growth and attachment, and can also provide additional radial support for the overall structure (multiple directions can be set), to prevent the longer tibial tray extension rod 2 from being squeezed and deformed during installation or when the patient moves after installation. Figure 3 A form of tibial tray extension rod 2 is shown in the figure, which is a hollow cylindrical structure with external and internal threads at both ends for connecting other structures; when the tibial tray intramedullary rod of the tibial tray body 1 is conical, the internal thread at one end of the first section of the tibial tray extension rod 2 can be correspondingly designed as a conical internal thread to obtain a better and more stable connection effect.

[0046] In order to ensure excellent biocompatibility and durability, the tibial tray extension rod 2 is made of biocompatible materials, such as medical-grade stainless steel, titanium alloy, tantalum metal, tantalum alloy, cobalt-chromium-molybdenum alloy or biomedical plastic. These materials not only provide the necessary mechanical strength, but also minimize allergic reactions or rejection reactions caused by implants. Among them, tantalum alloys can be used such as titanium-tantalum alloys or titanium-based tantalum coatings. Tantalum has significant benefits in bone integration, can improve the bonding strength between implants and bones, and reduce complications in long-term use.

[0047] The structural design of the tibial tray extension rod 2 should also consider the relationship between its implant length and biomechanics, ensure that the load is evenly distributed when it is subjected to normal knee joint activities, reduce stress concentration on the surrounding bones, and thus reduce the risk of prosthesis loosening or bone defects during long-term use. In this regard, the tibial tray extension rod 2 can preferably be manufactured using 3D printing technology to have a more suitable personalized structural design (allowing the tibial tray extension rod 2 to be more accurately customized according to the patient's specific anatomical structure), especially in some complex structural environments, can provide better personalized adaptation, and can achieve a more complex structural design.

[0048] In order to further improve bone integration and biocompatibility, the surface of the tibial tray extension rod 2 can be specially treated, such as applying micro-nano surface texture to form a surface micro-nano structure for new bone to grow, or coating the surface with bioactive substances to form a bioactive layer. These surface treatment technologies can promote bone cell growth and attachment, and enhance the stability of the implant. At the same time, the side wall of the tibial tray extension rod 2 can also be extended in both directions to open holes, so that cells can grow in the inside and outside of the tibial tray extension rod 2, further improving the bonding firmness.

[0049] Through these innovative designs, the modular artificial knee joint tibial support extension rod 2 components of the utility model not only improve the adaptability and precision of the operation, have a wider range of applications and higher adaptability, but also reduce the postoperative recovery time, improve the stability and durability of the implant, meet the needs of different patients, and provide patients with more personalized and effective treatment plans.

[0050] The main purpose of the utility model is to provide an artificial knee joint tibial tray extension rod 2 component that can adapt to individual differences of patients, so as to achieve a more personalized treatment plan and optimize the surgical effect. Through the design of the assembleable tibial tray extension rod 2, the utility model aims to solve the following key problems:

[0051] Improved surgical adaptability and precision: By offering a range of configurable tibial tray extensions2 in varying lengths and diameters, surgeons can select the most appropriate component based on each patient’s specific bone structure and health condition, thereby improving surgical precision and adaptability.

[0052] Reduced intraoperative trauma and postoperative recovery time: Due to the ability to better adapt to the patient's knee joint, unnecessary bone resection and tissue damage during surgery are reduced, thereby reducing postoperative recovery time and the risk of complications.

[0053] Improved implant stability and durability: By precisely matching the patient’s anatomy, the mismatch between the prosthesis and the bone is reduced, thereby improving implant stability and durability and reducing the risk of complications in long-term use.

[0054] Economic and environmental benefits: Reduces the need for various large-sized tibial tray extensions 2, reduces inventory costs and management difficulties for hospitals, while reducing medical waste and having a positive impact on the environment.

[0055] In general, the utility model aims to improve surgical results, increase patient satisfaction, and reduce overall medical costs and environmental impact by providing a more flexible, economical and personalized artificial knee tibial tray extension rod 2 component.

[0056] Example 2

[0057] This embodiment is basically similar to the embodiment 1 in structure, the main difference is that the tibial tray extension rod 2 in this embodiment adopts a frustum-shaped structure, such as Figure 2 As shown, after multiple sections are assembled, a larger cone is formed, and the taper is controlled by assembly according to needs, usually within 3-10°.

[0058] The above description of the embodiments is to facilitate the understanding and use of the utility model by those skilled in the art. It is obvious that those familiar with the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the utility model is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the utility model without departing from the scope of the utility model should be within the scope of protection of the utility model.

Claims

1. A modular artificial knee joint tibial tray assembly, characterized in that: It comprises a tibial tray body (1) and at least one tibial tray extension rod (2); The tibial tray extension rod (2) is connected to the tibial tray body (1) via a threaded structure or a mortise and tenon structure; When the number of tibial support extension rods (2) is greater than two, adjacent tibial support extension rods (2) are connected via a threaded structure or a mortise and tenon structure; The length of the tibial support extension rod (2) is not less than 2 cm and less than 30 cm.

2. The modular artificial knee joint tibial tray assembly according to claim 1, characterized in that: The tibial support extension rod (2) is a columnar structure or a frustum-shaped structure.

3. The modular artificial knee joint tibial tray assembly according to claim 1, characterized in that: The tibial support extension rod (2) is a hollow structure or an internal support structure.

4. The modular artificial knee joint tibial tray assembly according to claim 3, characterized in that: The inner support structure is a support rod arranged inside the tibial support extension rod (2).

5. The modular artificial knee joint tibial tray assembly according to claim 1, characterized in that: The diameter of the tibial support extension rod (2) is 5-40 mm.

6. The modular artificial knee joint tibial tray assembly according to claim 1, characterized in that: The material of the tibial support extension rod (2) is biomedical metal or biomedical plastic.

7. The modular artificial knee joint tibial tray assembly according to claim 6, characterized in that: The biomedical metal is medical stainless steel, titanium alloy, tantalum metal, tantalum alloy or cobalt-chromium-molybdenum alloy.

8. The modular artificial knee joint tibial tray assembly according to claim 7, characterized in that: The tantalum alloy is a titanium-tantalum alloy or a titanium substrate provided with a tantalum coating.

9. The modular artificial knee joint tibial tray assembly according to claim 1, characterized in that: The surface of the tibial support extension rod (2) is provided with a surface micro-nano structure.

10. The modular artificial knee joint tibial tray assembly according to claim 1, characterized in that: The surface of the tibial support extension rod (2) is coated with a bioactive substance layer.

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