Biological prosthesis for patellofemoral joint replacement

Abstract

The invention provides a biological prosthesis for patellofemoral joint replacement, and belongs to the technical field of artificial joints. A base body; the titanium alloy and hydroxyapatite coating is smeared on the surface of the base body; the support column is fixedly connected to the inner wall of the base body, the prosthesis adopts the titanium alloy and hydroxyapatite coating, so that the biocompatibility of the material is enhanced, and the coating formed by a spraying process has good binding force and can promote ingrowth of surrounding bone tissues; the characteristic means that the prosthesis can be more stably fixed on the bone of a patient after being implanted, related complications possibly caused by a traditional bone cement fixing mode are not used, in addition, due to the fact that bone cement does not need to be used, the operation process is simplified, and convenient conditions are provided for revision operations possibly needing to be conducted in the future.

Description

Technical Field

[0001] The invention belongs to the technical field of artificial joints, and in particular relates to a biological prosthesis for patellofemoral joint replacement. Background Art

[0002] Patellofemoral joint prosthesis is a surgical implant used to replace the knee joint and is used in patellofemoral joint replacement surgery. The material of the existing patellofemoral joint prosthesis is cobalt-chromium-molybdenum alloy. At present, most of the knee joint implants on the market use bone cement prostheses.

[0003] At present, when performing patellofemoral joint surgery in China, bone cement is often used to fill the holes after the prosthesis column fixation holes are completed in the femoral part. At the same time, bone cement is used to cover the prosthesis joint surface and the femoral osteotomy surface. The prosthesis is implanted after the bone cement solidifies. However, bone cement is often toxic, and bone cement will generate a lot of heat during the drying process, which will damage the bone and tissue around the patient's joints, and there is a risk of causing transient hypotension and shock to the patient. At the same time, using bone cement to fill the holes of the prosthesis fixation column is not convenient to remove during revision, and it is easy to cause bone cement residues to float in the body during osteotomy. Summary of the invention

[0004] The purpose of the present invention is to provide a bio-type prosthesis for patellofemoral joint replacement, aiming to solve the problem in the prior art that when performing patellofemoral joint surgery in China, bone cement is often used to fill the hole after the prosthesis column fixing hole is completed in the femoral part, and the prosthesis joint surface and the femoral osteotomy surface are covered with bone cement at the same time, and the prosthesis implantation is completed after the bone cement is solidified, but bone cement is often toxic, and bone cement generates a large amount of heat during the drying process, which will injure the bone and tissue around the patient's joint, and there is a risk of causing a transient decrease in blood pressure to cause shock in the patient. At the same time, bone cement is used to fill the hole of the prosthesis fixing column, which is inconvenient to remove during renovation, and it is easy to cause the problem of bone cement residues floating in the body during osteotomy.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A bioprosthesis for patellofemoral joint replacement, comprising:

[0007] matrix;

[0008] Titanium alloy and hydroxyapatite coating, wherein the titanium alloy and hydroxyapatite coating are applied to the surface of the substrate;

[0009] The support column is fixedly connected to the inner wall of the base body.

[0010] As a preferred solution of the present invention, a plurality of grooves are formed on the inner wall of the base.

[0011] As a preferred solution of the present invention, the thickness of the titanium alloy and hydroxyapatite coating is ±μm.

[0012] As a preferred solution of the present invention, the base and the support are designed to be integrally formed.

[0013] As a preferred solution of the present invention, the titanium alloy and hydroxyapatite coating are formed on the surface of the substrate by a spraying process. The titanium alloy and hydroxyapatite coating have good bonding strength with the substrate, can promote the growth of surrounding bone tissue, thereby improving the stability of the prosthesis after implantation, and no bone cement is required for fixation.

[0014] As a preferred solution of the present invention, the base is provided with various models and specifications to meet the needs of different patients.

[0015] As a preferred solution of the present invention, the support column is connected to the patient's bones by press-fitting, thereby avoiding the use of bone cement and the occurrence of related complications, while facilitating revision surgery that may be required in the future.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The prosthesis uses titanium alloy and hydroxyapatite coating, which not only enhances the biocompatibility of the material, but also the coating formed by the spraying process has good bonding strength and can promote the growth of surrounding bone tissue. This feature means that the prosthesis can be more stably fixed to the patient's bones after implantation, without the related complications that may be caused by traditional bone cement fixation methods. In addition, since bone cement is not required, the surgical process is simplified and convenient conditions are provided for revision surgery that may be required in the future.

[0018] 2. The bone articular surface of the biological patellofemoral prosthesis is sprayed with titanium alloy and hydroxyapatite. When implanted, the prosthesis fixing column and the hole are press-fitted, which can not only ensure the implantation stability of the prosthesis, but also promote bone ingrowth.

[0019] 3. This biological patellofemoral joint prosthesis has various models and specifications and can be used in different situations and for different patients. It can expand the scope of application of patellofemoral joint replacement patients and meet the needs of more patients.

[0020] 4. This biological patellofemoral prosthesis does not require the use of bone cement for bonding and fixation during implantation, thus avoiding the harm to patients caused by the toxicity of bone cement itself and the negative effects during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 It is a structural schematic diagram of the present invention;

[0023] Figure 2 It is a sectional stereogram in the present invention.

[0024] In the figure: 1. substrate; 2. titanium alloy and hydroxyapatite coating; 3. pillar. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Example 1

[0027] See also Figure 1-Figure 2 , the present invention provides the following technical solutions:

[0028] A bioprosthesis for patellofemoral joint replacement, comprising:

[0029] Matrix 1;

[0030] Titanium alloy and hydroxyapatite coating 2, the titanium alloy and hydroxyapatite coating 2 is applied on the surface of the substrate 1;

[0031] A support column 3, the support column 3 is fixedly connected to the inner wall of the base body 1;

[0032] The inner wall of the base body 1 is provided with a plurality of grooves.

[0033] In a specific embodiment of the present invention, the substrate 1 is made of titanium alloy and has good biocompatibility and mechanical strength. The substrate 1 is designed to adapt to the anatomical shape of the patellofemoral joint to ensure the maximum recovery of joint function after surgery. The titanium alloy and hydroxyapatite coating 2 is evenly coated on the surface of the substrate 1 by plasma spraying technology to form a layer of titanium alloy and hydroxyapatite composite coating, which enhances the bonding force between the prosthesis and the surrounding bones and promotes the bone integration process. Among them, the titanium alloy provides the necessary mechanical support and corrosion resistance; and hydroxyapatite, because its chemical composition is close to the inorganic part in the human skeleton, can effectively promote the growth of new bone tissue. The pillar 3 is made of the same material as the substrate 1, providing additional support, facilitating installation, and improving stability. The inner wall of the substrate 1 is specially provided with a plurality of tiny grooves, which not only increases the friction coefficient between the inner surface of the substrate 1 and the filler, thereby improving the overall stability, but also creates favorable conditions for soft tissue attachment. The patellofemoral joint biological prosthesis is suitable for patients who need patellofemoral joint replacement surgery due to severe degeneration, trauma or other reasons. It combines the advantages of advanced material science and engineering technology, and while ensuring long-term durability, it also improves the patient's recovery speed and quality of life. The device uses a titanium alloy matrix 1 as an important material, which better meets the needs of the human body, does not produce rejection, and does not contain toxic substances. The bone joint surface of this biological patellofemoral prosthesis is sprayed with titanium alloy and hydroxyapatite. When implanted, a press-fit is adopted between the prosthesis fixing column and the hole, which can not only ensure the implant stability of the prosthesis, but also promote bone ingrowth.

[0034] For details, please refer to Figure 1-Figure 2 , the thickness of the titanium alloy and hydroxyapatite coating 2 is 500±300 μm.

[0035] In this embodiment: the thickness is 500±300μm, which can improve the implant stability and bone ingrowth of the substrate 1, increase the service life of the prosthesis, and reduce the difficulty of the patient's later revision surgery. This thickness is designed to balance the mechanical properties and biological properties of the coating. On the one hand, sufficient thickness can ensure good coverage of the coating on the base material and improve wear resistance; on the other hand, appropriate thickness helps to maintain the internal porosity of the coating, promote bone cell growth and vascularization process, and the titanium alloy part provides the necessary mechanical support and corrosion resistance; and hydroxyapatite, because its chemical composition is close to the inorganic part in the human skeleton, can effectively promote the growth of new bone tissue and accelerate the bone integration process.

[0036] For details, please refer to Figure 1-Figure 2 The base 1 and the support 3 are designed to be integrally formed.

[0037] In this embodiment, the support 3 is located at a specific position inside the base body, in order to provide additional support and possibly be used as an auxiliary positioning tool. The one-piece design ensures a seamless combination between the support and the base body, increasing the overall rigidity and reliability of the structure.

[0038] For details, please refer to Figure 1-Figure 2 The titanium alloy and hydroxyapatite coating 2 are formed on the surface of the substrate 1 through a spraying process. The titanium alloy and hydroxyapatite coating 2 have good bonding strength with the substrate 1, which can promote the growth of surrounding bone tissue, thereby improving the stability of the prosthesis after implantation, and there is no need to use bone cement for fixation.

[0039] In this embodiment: the titanium alloy and hydroxyapatite coating 2 are directly deposited on the surface of the substrate 1 through a plasma spraying process. During the spraying process, a strong metallurgical bond is formed between the coating and the substrate 1, ensuring that the coating will not fall off easily. The titanium alloy part provides the necessary mechanical support and corrosion resistance; and hydroxyapatite, because its chemical composition is close to the inorganic part in the human skeleton, can effectively promote the growth of new bone tissue and accelerate the bone integration process. The special properties of the coating can induce the surrounding bone tissue to grow into the micropores inside the coating, thereby achieving biological fixation without the need for additional bone cement for fixation.

[0040] For details, please refer to Figure 1-Figure 2 The base 1 has various models and specifications to meet the needs of different patients.

[0041] In this embodiment: In order to meet the specific needs of different patients, the base 1 is provided with a variety of models and specifications, including but not limited to different sizes, thicknesses and curvatures, etc., so that the doctor can select the most suitable model according to the anatomical characteristics of the patient.

[0042] For details, please refer to Figure 1-Figure 2 The support column 3 is connected to the patient's bone by a press-fit method, avoiding the use of bone cement and its related complications, while facilitating revision surgery that may be required in the future.

[0043] In this embodiment: the support column 3 is designed with a special press-fit structure, so that it can be tightly connected to the patient's bones by press-fitting. The press-fit design also facilitates revision surgery that may be needed in the future, thereby simplifying the secondary surgery process and reducing damage to surrounding healthy bones.

[0044] The working principle and use process of the present invention are as follows: according to the imaging data and personal anatomical characteristics, the model and specification of the substrate 1 that best meets the patient's needs are selected, and a bone hole for press-fitting the pillar 3 is prepared at a predetermined position. The substrate 1 with the titanium alloy and hydroxyapatite coating 2 is placed in the correct position, and the pillar 3 is fixed in the pre-prepared bone hole by press-fitting to ensure its stability. The position and range of motion of the prosthesis are checked, and fine-tuning is performed when necessary to ensure that there is no conflict between the prosthesis and the surrounding structures and that the patellar trajectory is normal. The incision is closed with absorbable sutures or other methods, and the wound is bandaged.

[0045] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A bioprosthesis for patellofemoral joint replacement, characterized in that: include: Matrix (1); A titanium alloy and hydroxyapatite coating (2), wherein the titanium alloy and hydroxyapatite coating (2) is applied to the surface of a substrate (1); A support (3), wherein the support (3) is fixedly connected to the inner wall of the base (1).

2. A bioprosthesis for patellofemoral joint replacement according to claim 1, characterized in that: The inner wall of the base body (1) is provided with a plurality of grooves.

3. A bioprosthesis for patellofemoral joint replacement according to claim 2, characterized in that: The thickness of the titanium alloy and hydroxyapatite coating (2) is 500±300 μm.

4. A bioprosthesis for patellofemoral joint replacement according to claim 3, characterized in that: The base (1) and the support (3) are designed to be integrally formed.

5. The bioprosthesis for patellofemoral joint replacement according to claim 4, characterized in that: The titanium alloy and hydroxyapatite coating (2) is formed on the surface of the substrate (1) by a spraying process. The titanium alloy and hydroxyapatite coating (2) has good bonding strength with the substrate (1), and can promote the growth of surrounding bone tissue, thereby improving the stability of the prosthesis after implantation, and does not require the use of bone cement for fixation.

6. A bioprosthesis for patellofemoral joint replacement according to claim 5, characterized in that: The base (1) is provided with a variety of models and specifications, suitable for the needs of different patients.

7. A bioprosthesis for patellofemoral joint replacement according to claim 6, characterized in that: The support (3) is connected to the patient's bones by a press-fit method, thereby avoiding the use of bone cement and the occurrence of related complications, while facilitating revision surgery that may be required in the future.

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