Bionic thighbone tackle prosthesis suite

Abstract

The utility model relates to a medical implant instrument, in particular to a bionic thighbone tackle prosthesis suite which comprises a thighbone tackle prosthesis. A tackle groove is formed in the articular surface of the thighbone tackle prosthesis, the tackle groove is formed in the coronal position and located on the center line of the thighbone tackle prosthesis or on the outer side of the center line, and the lowest walking point of the tackle groove is located on the outer side of the center line. Compared with the prior art, the thighbone tackle prosthesis overcomes the defects that in the prior art, due to the fact that the design direction of the thighbone tackle prosthesis is wrong, a patient cannot change the wrong movement mode fundamentally after the thighbone tackle prosthesis is installed, and then various complications occur, and the retention rate of the prosthesis is low. According to the scheme, wrong teaching and thinking impairment in the prior art are broken through, and the defects that in the prior art, complications are likely to be caused by the prosthesis and the retention rate of the prosthesis is low are fundamentally overcome by simulating the prosthesis into a correct tissue structure.

Description

Technical Field

[0001] The utility model relates to a medical implant device, in particular to a bionic femoral pulley prosthesis kit. Background Art

[0002] Osteoarthritis (OA) is a chronic joint disease characterized by degeneration, destruction and bone hyperplasia of articular cartilage. The prevalence of OA in people over 60 years old can reach 50%, and in people over 75 years old it can reach 80%, and the disability rate can be as high as 53% (Chinese Medical Association Orthopedics Branch, 2007 "Osteoarthritis Diagnosis and Treatment Guidelines" revised edition). OA is prone to occur in the knee joint, called knee osteoarthritis (KOA), and the impact on human health and the medical expenses caused by it are increasing. Among them, the femoral trochlea is the main lesion, such as femoral trochlea degeneration and femoral trochlea cartilage defect. The incidence rate is increasing year by year, often manifested as knee pain during activities, mainly in front of the knee, aggravated when climbing stairs, squatting and stepping, relieved when resting, affecting the patient's life. For patients with moderate to severe femoral trochlea disease or those who are ineffective with symptomatic treatment, it has a great impact on the quality of life of patients.

[0003] For patients with moderate to severe femoral trochlear disease, the main treatment methods in clinical practice include partial joint replacement and total knee replacement. Although total knee arthroplasty (TKA) is a mature technology with stable efficacy for the treatment of joint degeneration and cartilage defects, for patients whose lesions are limited to the femoral trochlear joint, the surgery needs to destroy the normal medial and lateral compartments of the knee joint, which is more traumatic and has many complications, and there is overtreatment. Partial joint replacement (PFA) started relatively late, but the current prosthesis retention rate is not high, and there are prominent complications such as postoperative prepatellar pain, osteolysis, and prosthesis loosening, which is in the "awkward zone" of treatment. The reason for this is the postoperative complications caused by unreasonable prosthesis design.

[0004] Therefore, further improvements and adjustments to the prosthesis structure are needed to increase the prosthesis retention rate and control the complications caused by it. Utility Model Content

[0005] The purpose of the present utility model is to provide a bionic femoral trochlear prosthesis kit in order to solve at least one of the above problems, so as to solve the problem that the femoral trochlear prosthesis in the prior art has errors in design direction, resulting in the patient's inability to fundamentally change the wrong movement mode after installing the femoral trochlear prosthesis, which in turn leads to the occurrence of various complications and the defect of low prosthesis retention rate; this solution breaks the erroneous teachings and thinking barriers of the prior art, and fundamentally overcomes the problem that the prosthesis in the prior art is prone to cause complications and has a low prosthesis retention rate by biomimetic correct tissue structure of the prosthesis.

[0006] The purpose of the utility model is achieved through the following technical solutions:

[0007] A bionic femoral trochlear prosthesis kit comprises a femoral trochlear prosthesis;

[0008] The articular surface of the femoral trochlear prosthesis is provided with a trochlear groove, which is arranged in the coronal position on the midline of the femoral trochlear prosthesis or outside the midline, and the lowest point of the trochlear groove is located outside the midline.

[0009] One of the causes of existing femoral trochlear disease is that the trochlear groove of the femoral trochlear is oriented incorrectly, extending inwardly (relative to the midline of the human body) or straight downwardly, while the trochlear groove of a normal femoral trochlear should be oriented outwardly. Although the trochlear groove on the existing femoral trochlear prosthesis also adopts a bionic design, it is designed to imitate the problematic femoral trochlear, resulting in the trochlear groove thereon being designed in the wrong direction to extend along the midline (midline of the femoral trochlear) or toward the inside of the midline (midline of the femoral trochlear), and further, after the existing femoral trochlear prosthesis is installed and applied to the patient, there is still continuous friction, resulting in rapid wear of the prosthesis and discomfort when worn.

[0010] The applicant studied the femoral trochlear structure of normal humans and diseased patients and was surprised to find the problems and defects of the existing prostheses in use. In response to this, the applicant proposed a femoral trochlear prosthesis with a truly bionic structure, in which the trochlear groove is arranged in the coronal position on the midline or outside the midline of the femoral trochlear prosthesis, and the lowest point of the trochlear groove is located outside the midline, which is consistent with the femoral trochlear structure of a normal person. Therefore, after the prosthesis is installed, friction in the wrong direction will no longer occur, which can effectively ensure the prosthesis retention rate and avoid most complications.

[0011] Preferably, the femoral trochlear prosthesis includes a guide area and a flexion weight-bearing area; the guide area is in a neutral position of 0° from the proximal end to the distal end; the flexion weight-bearing area is deviated 1-5° from the proximal end to the distal end, and the radius from the flexion weight-bearing area to the lowest point of the flexion position is 20±5mm.

[0012] Preferably, the bone surface of the femoral trochlear prosthesis is provided with a fixing piece for assembling the femoral trochlear prosthesis at the femoral defect position. The fixing piece enables the prosthesis to be inserted into the corresponding bone defect position, making the assembly reliable.

[0013] Further preferably, the fixing member includes a fixing column and a fixing plug plate (including a straight plate and an arc-shaped plate), which are plugged into and matched with a slot pre-opened at the femoral defect position; the fixing column and the fixing plug plate can also be used in combination.

[0014] Further preferably, the fixing members may be provided in plurality; if they are provided as fixed columns, three fixing members may be provided on non-colinear lines to form a triangular fixation; if they are provided as arc-shaped plates or straight plates, they may be arranged at intervals along the circumference of the femoral trochlear prosthesis to form an interval ring-shaped limiter; if the fixed columns and the fixed plug plates are used together, the fixed columns may be arranged at the center position, and the fixed plug plates may be arranged around the fixed columns and close to the sides of the femoral trochlear prosthesis.

[0015] Preferably, the surface of the fixing piece is provided with a mesh structure, and the design of the mesh structure can increase friction and strengthen the adhesion of bone tissue, making the assembly and combination tighter.

[0016] Preferably, the unit structures of the network structure include diamond, dodecahedron, helical tetrahedron, octahedron and cage structure.

[0017] Preferably, the mesh structure is made of porous tantalum, porous titanium or porous polymer material.

[0018] Preferably, the surface of the fixing piece is also provided with openings or hollow structures, which can further enable bone tissue to grow in an alternating manner inside and outside the fixing piece, thereby providing a strong bonding effect.

[0019] Preferably, the femoral trochlear prosthesis is made of one or more of polymer materials, ceramics and metals.

[0020] Preferably, the bone surface of the femoral trochlear prosthesis is a smooth surface or a rough surface.

[0021] Preferably, the bionic femoral trochlear prosthesis kit also includes a patellar prosthesis; the articular surface of the patellar prosthesis is provided with an outer protrusion, and the outer protrusion is slidably matched with the trochlear groove. When both the patella and the femur are defective or worn, the kit is used to replace them together.

[0022] Preferably, the bone surface of the patellar prosthesis is provided with a fixing device for assembling the patellar prosthesis at the position of the patellar defect; the surface of the fixing device is provided with a mesh structure, the unit structure of the mesh structure includes a diamond type, a dodecahedron, a spiral icosahedron, an octahedron and a cage structure, and the material of the mesh structure is porous tantalum, porous titanium or a porous polymer material; the material of the patellar prosthesis is one or more of a polymer material, ceramics and metal; the bone surface of the patellar prosthesis is a smooth surface or a rough surface.

[0023] Compared with the prior art, the utility model has the following beneficial effects:

[0024] The present invention solves the following problems in the prior art: 1. Total knee replacement causes great trauma; 2. Some joint replacements are not designed in a friendly way, causing anterior knee pain after surgery, leading to osteolysis, loosening of the prosthesis, inability to fix it biologically, and inability to be applied to a wider population. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the front view structure of the femoral trochlear prosthesis;

[0026] Figure 2 A schematic diagram of the structure when the femoral trochlear prosthesis kit is used together;

[0027] In the figure: 1-femoral trochlear prosthesis; 11-trochlear groove; 12-fixing piece; 13-mesh structure; 14-guiding area; 15-flexion weight-bearing area; 2-patellar prosthesis. DETAILED DESCRIPTION

[0028] The utility model is described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Example

[0030] A bionic femoral trochlear prosthesis 1 kit, such as Figure 1 and Figure 2 As shown, it includes a femoral trochlea prosthesis 1;

[0031] The articular surface of the femoral trochlear prosthesis 1 is provided with a trochlear groove 11, which is arranged on the midline of the femoral trochlear prosthesis 1 or outside the midline in the coronal position, and the lowest point of the trochlear groove 11 is located outside the midline.

[0032] More specifically, in this embodiment:

[0033] The kit includes a femoral trochlear prosthesis 1, and if the patella also needs to be replaced, a patellar prosthesis 2 is also included; this embodiment is described in terms of the way in which the femoral trochlear prosthesis 1 and the patellar prosthesis 2 are used together.

[0034] The femoral trochlear prosthesis 1 can be made of polymer materials, ceramics and metals alone or in combination. According to the structural design and functional zoning, the femoral trochlear prosthesis 1 is further divided into a guide area 14 and a flexion load-bearing area 15 (priority area), both of which are valley (concave surface) structures with high sides on both sides. The trochlear groove 11 formed in the middle of the articular surface is located on the midline of the prosthesis or outside the midline in the coronal position (left-right direction), and the lowest point of the trochlear groove 11 is always outside the midline. The guide area 14 is in a neutral position of 0° from the proximal end to the distal end, and the flexion load-bearing area 15 (priority area) is outwardly biased by 1-5° from the proximal end to the distal end, and the radius from the flexion load-bearing area 15 to the lowest point in the sagittal position is 20±5mm (in this embodiment, Figure 2As shown in , the radius is 20+5mm). The bone surface of the femoral trochlear prosthesis 1 is designed to be smooth or rough, in contact with the defective surface of the femur, and may be provided with fixing parts 12 at intervals to ensure a stable assembly and insertion into the femur. The surface of the fixing part 12 is provided with a column mesh of a mesh structure 13, and the column mesh may be composed of metals such as porous tantalum or porous polymer materials, etc., to provide a place for new bone tissue to grow and to increase the surface roughness to increase friction, so that the prosthesis is not easy to slip. In this embodiment, the fixing part 12 on the femoral trochlear prosthesis 1 is a fixing part 12 in the form of a fixed column, such as Figure 2 , and three are set to form a triangular limit; in other embodiments, a fixing member 12 in the form of a fixed plug plate can also be used, including a straight plate and an arc plate, which are arranged at intervals along the circumference of the femoral trochlear prosthesis 1 (such as 4-6 are set at intervals) to form a ring-shaped limit; further, a combination of a fixed column and a fixed plug plate can also be used, such as setting the fixed column at the center of the femoral trochlear prosthesis 1, and the fixed plug plate surrounds the fixed column and is set close to the side of the femoral trochlear prosthesis 1.

[0035] The patellar prosthesis 2 as a whole is slidably matched with the femoral trochlear prosthesis 1. Specifically, the patellar prosthesis 2 is formed with a convexity on the articular surface, and the convexity is slidably matched with the trochlear groove 11. The patellar prosthesis 2 can be made of polymer, ceramic, metal alone or in combination, and is in a corresponding relationship with the femoral trochlear prosthesis 1. The articular surface is regularly or irregularly convex, the bone surface is flat, and there is a fixing member 12. The fixing member 12 can also be equipped with a column sleeve net with a mesh structure 13. The column sleeve net can be composed of metals such as porous tantalum or porous polymer materials. In this embodiment, the fixing member 12 on the patellar prosthesis 2 is consistent with the femoral trochlear prosthesis 1, and also adopts a fixing member 12 in the form of a fixed column, and three are set to form a triangular limit.

[0036] The fixing member 12 used in combination can be specifically designed for structural dimensions such as diameter, length, and quantity according to the actual clinical situation; the bone surface of the femoral trochlear prosthesis 1 and the patellar prosthesis 2 can be smooth or rough; the column sleeve of the mesh structure 13 can be prepared by laser engraving, 3D printing, etc., and its material can be porous tantalum, porous titanium, porous polymer materials and other medical biomaterials. The changes in its structural units include but are not limited to diamond type, dodecahedron, spiral icosahedron, octahedron, cage structure, etc., and the changes in its thickness, pore size and porosity are personalized according to the size of the fixing member 12. In this embodiment, three fixing members 12 are provided to form a triangular fixation, which has a more stable assembly effect; according to needs, it can be in the form of a regular triangle (one is provided in the guide area 14 and two are provided in the flexion load-bearing area 15) or an inverted triangle (two are provided in the guide area 14 and one is provided in the flexion load-bearing area 15). Furthermore, a hole may be opened on the fixing member 12 or a hollow structure may be provided so that the bone tissue can be interwoven with the fixing member 12 to form a reliable combination.

[0037] One of the causes of existing femoral trochlear disease is that the trochlear groove 11 of the femoral trochlear is in the wrong direction, extending inward (relative to the midline of the human body) or straight downward, while the trochlear groove 11 of a normal femoral trochlear should be facing outward; although the trochlear groove 11 on the existing femoral trochlear prosthesis 1 also adopts a bionic design, it is designed to imitate the problematic femoral trochlear, resulting in the trochlear groove 11 thereon being designed according to the wrong direction to extend along the midline (midline of the femoral trochlear) or towards the inside of the midline (midline of the femoral trochlear), and then after the existing femoral trochlear prosthesis 1 is installed and applied to the patient, there is still continued friction, resulting in rapid wear of the prosthesis and discomfort when wearing.

[0038] The applicant studied the femoral trochlear structure of normal human bodies and diseased patients and was surprised to find the problems and defects of the existing prostheses in use. In response to this, the applicant proposed a femoral trochlear prosthesis 1 with a truly bionic structure, on which the trochlear groove 11 is arranged in the coronal position on the midline or outside the midline of the femoral trochlear prosthesis 1, and the lowest point of the trochlear groove 11 is located outside the midline, which is consistent with the femoral trochlear structure of a normal person. Therefore, after the prosthesis is installed, friction in the wrong direction will no longer occur, which can effectively ensure the prosthesis retention rate and avoid most complications.

[0039] Therefore, this prosthesis kit can adapt to special bone beds or can be used for biological fixation. It solves the current problems: 1. Total knee replacement is very traumatic; 2. Some joint replacement designs are not friendly, causing postoperative anterior knee pain, osteolysis, loosening of the prosthesis, inability to fix biologically, and inability to be applied to more people.

[0040] 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 bionic femoral trochlea prosthesis kit, characterized in that: Includes femoral trochlear prosthesis (1); The articular surface of the femoral trochlear prosthesis (1) is provided with a trochlear groove (11), and the trochlear groove (11) is arranged on the midline or outside the midline of the femoral trochlear prosthesis (1) in the coronal position, and the lowest point of the trochlear groove (11) is located outside the midline.

2. The bionic femoral trochlea prosthesis kit according to claim 1, characterized in that: The femoral trochlear prosthesis (1) comprises a guide area (14) and a flexion load-bearing area (15); the guide area (14) is in a neutral position of 0° from the proximal end to the distal end; the flexion load-bearing area (15) is outwardly deviated by 1-5° from the proximal end to the distal end, and the radius from the flexion load-bearing area (15) to the lowest point of the flexion position is 20±5 mm.

3. The bionic femoral trochlear prosthesis kit according to claim 1, characterized in that: The bone surface of the femoral trochlear prosthesis (1) is provided with a fixing piece (12) for assembling the femoral trochlear prosthesis (1) at the defective position of the femur.

4. The bionic femoral trochlear prosthesis kit according to claim 3, characterized in that: The surface of the fixing piece (12) is provided with a mesh structure (13).

5. The bionic femoral trochlear prosthesis kit according to claim 4, characterized in that: The unit structures of the network structure (13) include diamond, dodecahedron, helical tetrahedron, octahedron and cage structure.

6. The bionic femoral trochlear prosthesis kit according to claim 4, characterized in that: The material of the mesh structure (13) is porous tantalum, porous titanium or porous polymer material.

7. The bionic femoral trochlear prosthesis kit according to claim 1, characterized in that: The material of the femoral trochlear prosthesis (1) is one of polymer materials, ceramics and metals.

8. The bionic femoral trochlear prosthesis kit according to claim 1, characterized in that: The bone surface of the femoral trochlear prosthesis (1) is a smooth surface or a rough surface.

9. A bionic femoral trochlear prosthesis kit according to any one of claims 1 to 8, characterized in that: The bionic femoral trochlear prosthesis kit further comprises a patellar prosthesis (2); the articular surface of the patellar prosthesis (2) is provided with an external protrusion, and the external protrusion is in sliding engagement with the trochlear groove (11).

10. The bionic femoral trochlear prosthesis kit according to claim 9, characterized in that: The bone surface of the patellar prosthesis (2) is provided with a fixing piece (12) for assembling the patellar prosthesis (2) at the position of the patellar defect; the surface of the fixing piece (12) is provided with a mesh structure (13), the unit structure of the mesh structure (13) includes a diamond type, a dodecahedron, a spiral tetrahedron, an octahedron and a cage structure, and the material of the mesh structure (13) is porous tantalum, porous titanium or porous polymer material; the material of the patellar prosthesis (2) is one of a polymer material, ceramic and metal; the bone surface of the patellar prosthesis (2) is a smooth surface or a rough surface.

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