Composite fixed hip joint femoral stem for accelerating bone ingrowth

Abstract

The utility model discloses a composite fixed hip joint femoral stem for accelerating bone ingrowth in the technical field of medical instruments, which comprises a femoral stem, a femoral neck and a stem body, the femoral neck is of a conical structure, the diameter of the femoral neck is gradually reduced from one end close to the stem body to one end far away from the stem body, and a flat position is processed on the femoral neck close to the stem body. The handle body is provided with the two intersecting planes, the screw holes are formed in the handle body at intervals, the planes are perpendicular to the screw holes, a doctor selects a proper number of screws to lock the femoral handle and a bone bed through the screw holes in the femoral handle, and obvious prosthesis sinking caused by the fact that the prosthesis is not in tight press fit with the bone bed in the initial fixing stage is avoided. Therefore, the stability of the hip joint is reduced, and complications such as dislocation of the hip joint and unequal lengths of two lower limbs are caused.

Description

Technical Field

[0001] The utility model relates to the field of medical devices, in particular to a composite fixed hip joint femoral stem for accelerating bone ingrowth. Background Art

[0002] Medical devices refer to instruments, equipment, instruments, in vitro diagnostic reagents and calibrators, materials, and other similar or related items, including required computer software, intended for direct or indirect use on the human body. Medical devices include both medical equipment and medical consumables. Their effectiveness is primarily achieved through physical or other means, rather than through pharmacological, immunological, or metabolic pathways, or if these pathways are involved, they only play a supporting role.

[0003] Hip replacement is currently the most effective treatment for bone and joint diseases. It can effectively relieve pain, improve joint function, and restore joint stability and limb function. As a crucial component of hip replacement surgery, the femoral stem prosthesis plays a crucial role, and its implantation effect directly affects the degree of joint function recovery. With the trend of younger patients undergoing joint replacement, the demand for maximizing the patient's original bone stock is growing, making the use of a bio-fixed femoral stem the preferred surgical option.

[0004] Existing biological fixation of femoral stems usually goes through two stages: the initial fixation stage and the secondary fixation stage. The initial fixation is to make the prosthesis fit tightly into the bone bed by press-fitting. It relies on the shape of the prosthesis to fit closely with the bone bed to achieve a short-term fixation effect. The secondary fixation stage is to use surface spraying technology to make the surface of the prosthesis microporous on the basis of the close fit between the prosthesis and the bone bed to facilitate bone growth into the prosthesis and obtain long-term fixation, namely biological fixation. However, doctors are worried that the biological femoral stem may experience significant prosthesis sinking before bone growth occurs and a firm fixation is achieved, thereby reducing the stability of the hip joint and causing complications such as hip dislocation and unequal length of the lower limbs. Utility Model Content

[0005] The purpose of the present invention is to provide a composite fixed hip joint femoral stem with accelerated bone ingrowth, which solves the concerns raised in the above background technology that the biological femoral stem may undergo obvious prosthesis sinking before bone ingrowth occurs and a firm fixation is obtained, thereby reducing the stability of the hip joint and causing complications such as hip dislocation and unequal length of the lower limbs, by improving the initial fixation strength and accelerating bone ingrowth.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a composite fixed hip joint femoral stem for accelerating bone ingrowth, comprising a femoral stem, a femoral neck and a stem body, wherein the femoral neck is a conical structure, and the diameter of the femoral neck gradually decreases from one end close to the stem body to the end away from the stem body, and the femoral neck is processed with a flat position near the stem body.

[0007] As a further solution of the present invention: the femoral neck is provided with a fine external thread, and the femoral neck is provided with an internal thread.

[0008] As a further solution of the present invention: the handle body has two intersecting planes, and the handle body is provided with a plurality of screw holes spaced apart from each other, and the planes and the screw holes are perpendicular to each other.

[0009] As a further solution of the present invention: the outer wall of the handle is attached with a trabecular structure, and the trabecular structure is integrally formed by 3D printing. The BMP2 simulated embryo is dissolved in PBS buffer solution, and the BMP2 is loaded into the trabecular structure through multiple immersions.

[0010] Compared with the prior art, the beneficial effects of the present invention are:

[0011] In the present invention, the handle body has two intersecting planes, and a plurality of spaced screw holes are provided on the handle body. The planes and the screw holes are perpendicular to each other. The doctor selects an appropriate number of screws to lock the femoral stem and the bone bed through the screw holes on the femoral stem, thereby avoiding the prosthesis not being tightly pressed against the bone bed in the initial fixation stage, causing obvious prosthesis sinking, thereby causing decreased hip joint stability and causing complications such as hip dislocation and unequal length of the lower limbs.

[0012] In this practice, the stem body is attached to the trabecular structure. The trabecular structure is integrally formed by 3D printing, and then the basic structure is completed through surface treatment. The BMP2 simulated fetus is dissolved in PBS buffer, and the BMP2 is loaded into the trabecular structure through multiple immersions. This composite structure has better bone induction growth, significantly reduces the secondary fixation stage of biological fixation, thereby shortening the recovery period and reducing various complications caused by incomplete bone ingrowth of biological fixation. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the main structure of a composite fixed hip joint femoral stem for accelerating bone ingrowth according to the present invention;

[0014] Figure 2 This is a side view of the structure of a composite fixed hip joint femoral stem for accelerating bone ingrowth according to the present invention;

[0015] Figure 3 This is a schematic diagram of the side view of the installation structure of a composite fixed hip joint femoral stem for accelerating bone ingrowth according to the present invention;

[0016] Figure 4 The utility model is a cross-sectional schematic diagram of a composite fixed hip joint femoral stem for accelerating bone ingrowth when used in conjunction with a medical device.

[0017] In the figure: 1. Femoral stem; 2. Femoral neck; 21. Internal thread; 22. Flat position; 3. Stem body; 31. Flat surface; 32. Trabecular structure; 33. Screw hole; 4. Screw; 5. Guide. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0019] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first," "second," and the like are generally of the same type, and do not limit the number of objects; for example, the first object can be one or more. In addition, the term "and / or" in the specification and claims refers to at least one of the connected objects, and the character " / " generally indicates that the objects connected are in an "or" relationship.

[0020] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0021] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "disposed" should be understood in a broad sense. For example, they may refer to fixed connection or disposition, detachable connection or disposition, or integral connection or disposition. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0022] Example 1:

[0023] refer to Figures 1 to 2A composite fixed hip joint femoral stem 1 for accelerated bone ingrowth comprises a femoral neck 2 and a stem body 3. The femoral neck 2 is a conical structure that tapers from the stem body 3 away from the stem body 3 and is provided with fine external threads. This structure allows the femoral neck 2 to achieve a taper fit with other implants. This conical structure facilitates machining and provides a tight, gap-free fit with other implants, consistent with biomechanical restoration. It also eliminates the need for additional fixation, simplifying surgical procedures and reducing surgical risks.

[0024] refer to Figures 2 to 4 The femoral neck 2 includes an internal thread 21 and a flat portion 22. The stem body 3 is provided with a plurality of spaced screw holes 33. During hip replacement surgery, after the femoral stem 1 is hammered into the femur, a guide 5 is installed on the femoral neck 2. The guide 5 is fixed to the femoral stem 1 by the internal thread 21, and angular positioning is achieved by the flat portion 22, so that the hole on the guide coincides with the screw hole 33. Screw holes are drilled from the outside of the femur to the inside of the femur through the guide 5. The doctor selects an appropriate number of screws to lock the femoral stem and the bone bed through the screw holes 33 on the femoral stem, thereby avoiding the prosthesis not being tightly pressed against the bone bed in the initial fixation stage, causing obvious prosthesis sinking, thereby causing decreased hip joint stability and complications such as hip dislocation and unequal length of the lower limbs.

[0025] refer to Figures 2 to 3 The handle 3 is provided with a trabecular bone structure 32, which is integrally formed by 3D printing and then undergoes surface treatment to complete its basic structure. A BMP2 simulant is dissolved in PBS buffer and loaded into the trabecular bone structure 32 through multiple soakings. The prosthesis surface is microporous to facilitate bone ingrowth into the prosthesis, achieving long-term fixation, or biofixation. The microporous trabecular bone structure is the foundation of biofixation. Compared with traditional microporous structures, the BMP2-loaded trabecular bone structure 32 has better bone-induction ingrowth, significantly reducing the secondary fixation stage of biofixation, thereby shortening the recovery period and reducing various complications caused by incomplete bone ingrowth in biofixation.

[0026] Preferably, in this embodiment, BMP2 is bone morphogenetic protein 2. BMP is a group of highly conserved functional proteins belonging to the transforming growth factor-β (TGF-β) family. Among them, BMP-2 is one of the most widely studied BMPs with the strongest osteogenic activity. It has the ability to induce undifferentiated mesenchymal stem cells to differentiate and proliferate into chondrocytes and osteoblasts, thereby accelerating bone defect repair.

[0027] As an improvement direction of this embodiment:

[0028] If a coating containing bioactive molecules other than BMP-2, such as growth factors or drugs, is developed, BMP-2 can be replaced with the new coating to promote the proliferation and differentiation of bone cells.

[0029] At the same time, if a coating with antibacterial function is discovered, it can also be used to replace BMP-2 to prevent postoperative infection and improve the success rate of implants.

[0030] In practical applications, research is underway to develop 3D-printed porous structures tailored to a patient's specific bone density and mechanical requirements to optimize stress distribution and reduce stress shielding. Furthermore, smart materials that adapt to different mechanical environments within the body can be used, tailored to the patient's individual constitution and infection source. These materials can adjust their elastic modulus based on load changes.

[0031] During use, microsensors or wireless transmission devices can be integrated into the femoral stem to monitor the status of the implant and the health of surrounding tissues in real time. Combined with smartphone applications or remote monitoring systems, this allows doctors to remotely track patients' recovery progress and adjust treatment plans in a timely manner.

[0032] It should be noted that, in this article, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element. In addition, it should be noted that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the opposite order according to the functions involved. For example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0033] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

Claims

1. A composite fixed hip joint femoral stem for accelerating bone ingrowth, comprising a femoral stem (1), a femoral neck (2) and a stem body (3), characterized in that: The femoral neck (2) is a conical structure, and the diameter of the femoral neck (2) gradually decreases from the end close to the handle body (3) to the end away from the handle body (3). The femoral neck (2) is processed with a flat part (22) near the handle body (3).

2. The bone ingrowth-accelerating composite fixed hip joint femoral stem according to claim 1, characterized in that: The femoral neck (2) is provided with a fine external thread, and an internal thread (21) is provided inside the femoral neck (2).

3. The bone ingrowth-accelerating composite fixed hip joint femoral stem according to claim 1, characterized in that: The handle body (3) has two intersecting planes (31), and a plurality of screw holes (33) are provided on the handle body (3), and the planes (31) and the screw holes (33) are perpendicular to each other.

4. The bone ingrowth-accelerating composite fixed hip joint femoral stem according to claim 1, characterized in that: A trabecular bone structure (32) is attached to the outer wall of the handle body (3); the trabecular bone structure (32) is integrally formed by 3D printing; and the trabecular bone structure (32) is made of BMP2 material.

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