A bone defect implant device
By designing a porous bone defect implantation device and combining 3D printing technology with absorbable materials, the problems of insufficient blood supply and bone healing in the bone defect area were solved, achieving biomechanical restoration and healing of the bone defect area and reducing the risk of chronic inflammation and secondary surgery.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- THE FIRST AFFILIATED HOSPITAL OF JINZHOU MEDICAL UNIV
- Filing Date
- 2025-01-15
- Publication Date
- 2026-07-24
Smart Images
Figure CN224540376U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of medical device technology, and in particular to a bone defect implantation device. Background Technology
[0002] Compared to traditional clinical implants, simple support surgery cannot fundamentally solve the problems of blood supply and bone ingrowth in the bone defect area, nor can it inhibit bone resorption, stimulate bone formation, or stop the progression of the lesion. Non-biomimetic implants can lead to uneven distribution of biomechanical stress in the defect area, secondary chronic inflammatory infiltration, requiring a second surgery to remove the implant, resulting in secondary collapse of the implanted area.
[0003] Conventional biomimetic implant systems are mostly ordinary or coated implants, which are only suitable for open implantation surgery for routine bone defects. Compared with pathological bone defects or osteonecrosis, after conventional biomimetic implants are implanted, the bone at the lesion site is difficult to achieve satisfactory physiological healing, cannot effectively solve the problem of insufficient blood supply to the femoral head, and may even lead to secondary pathological necrosis. Utility Model Content
[0004] The purpose of this application is to provide a bone defect implantation device to at least partially solve the problems mentioned in the background art.
[0005] To achieve the above objectives, this application provides the following technical solution:
[0006] A bone defect implantation device includes a core, which has a porous structure and includes a front end, a middle section, and a tail end connected in sequence; the porosity of the middle section is greater than that of the front end and the tail end.
[0007] The bone defect implantation device of this utility model, by designing the trunk as a porous structure, can inhibit bone resorption and stimulate bone formation after implantation, thus reshaping the bone structure of the defect area and effectively restoring the mechanics of the bone defect area. Specifically, the porosity of the middle section of the bone defect implantation device is greater than that of the front and rear ends, ensuring a good match between the implantation device and the bone quality of the implantation area. The higher porosity in the middle section is beneficial for blood supply and bone tissue growth, while the lower porosity at the front and rear ends enhances the overall strength of the implantation device's integration with the bone.
[0008] In some embodiments, the porous structure includes a plurality of micropores penetrating the stem.
[0009] In some embodiments, the pore size of the porous structure at the front end and the tail end is 100μm-300μm, and the porosity is 30%-40%.
[0010] In some embodiments, the porous structure of the middle section has a pore size of 400μm-600μm and a porosity of 70%-80%.
[0011] In some embodiments, the length of the middle section is greater than the lengths of the front end and the tail end.
[0012] In some embodiments, the front end accounts for 25%-30% of the total length of the stem, the middle section accounts for 40%-50% of the total length of the stem, and the tail end accounts for 20%-35% of the total length of the stem.
[0013] In some embodiments, the stem is screw-shaped;
[0014] In some embodiments, the cadre has an axial cavity.
[0015] In some embodiments, the outer surface of the front end is provided with a threaded structure;
[0016] In some embodiments, the tail end is provided with a tail cap, and the bottom surface of the tail cap is provided with an inner locking hole in the center.
[0017] In some embodiments, the front end is provided with a cutting groove.
[0018] In some embodiments, the front end accounts for 20%-30% of the total length of the stem, the middle section accounts for 40%-50% of the total length of the stem, and the tail end accounts for 20%-40% of the total length of the stem.
[0019] In some embodiments, the cadre is a solid, columnar structure.
[0020] In some embodiments, the cross-section of the cadre is a polygonal structure.
[0021] In some embodiments, the front end is provided with an angle.
[0022] In some embodiments, the bone defect implantation device is fabricated using 3D printing in a single piece.
[0023] In some embodiments, the bone defect implant device is made of absorbable material.
[0024] In some embodiments, the absorbable material is polylactic acid. Attached Figure Description
[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0026] Figure 1 This is a front view of the bone defect implantation device in Embodiment 1 of this utility model;
[0027] Figure 2 This is a left view of the bone defect implantation device in Embodiment 1 of this utility model;
[0028] Figure 3 This is a front view of the bone defect implantation device in Embodiment 2 of this utility model;
[0029] Figure 4 This is a left view of the bone defect implantation device in Embodiment 2 of this utility model.
[0030] in:
[0031] 1. Cadre; 11. Front end; 111. Cutting groove; 12. Middle section; 13. Tail end; 14. Cavity; 2. Tail cap; 21. Inner locking hole. Detailed Implementation
[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0033] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0034] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0035] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.
[0036] Example 1
[0037] Embodiment 1 of this utility model provides a bone defect implantation device for internal fixation of fractures and minimally invasive surgery for bone defects, such as... Figure 1 and Figure 2 As shown. The bone defect implantation device includes a shaft 1, which has a porous structure and includes a front end 11, a middle section 12 and a tail end 13 connected in sequence; the porosity of the middle section 12 is greater than that of the front end 11 and the tail end 13.
[0038] The bone defect implantation device of Embodiment 1 of this utility model has a porous structure in the trunk 1. After implantation, it can inhibit bone resorption, stimulate bone formation, reshape the bone structure of the defect area, promote fracture healing, and effectively restore the biomechanical strength of the fracture site or bone defect site. Specifically, the porosity of the sequentially connected front end 11, middle section 12, and tail end 13 is different, with the porosity of the middle section 12 being greater than that of the front end 11 and tail end 13. This allows the bone defect implantation device to match the bone quality of the implantation area, achieving both structural and functional biomimicry. The relatively large porosity of the middle section 12 of the bone defect implantation device is beneficial for blood supply and nutrient exchange in the bone defect area, promoting bone tissue growth. The relatively small porosity of the front end 11 and tail end 13 of the bone defect implantation device can enhance its effective mechanical load and strengthen the overall integration of the implantation device with the bone.
[0039] In the first embodiment of this utility model, the porous structure includes multiple micropores that penetrate the core 1.
[0040] The porous structure of the front end 11 and the tail end 13 has a pore size of 100μm-300μm and a porosity of 30%-40%. The front end 11 and the tail end 13 are designed with low porosity, which can enhance the strength of the front end 11 and the tail end 13, ensuring that the nail is not easy to break; at the same time, it enhances the overall strength of the implant device to integrate with the bone.
[0041] The porous structure of the middle section 12 has a pore size of 400μm-600μm and a porosity of 70%-80%. The high porosity design of the middle section 12 facilitates blood supply and nutrient exchange in the bone defect area, promoting bone tissue growth.
[0042] In the first embodiment of this utility model, the length of the middle section 12 is greater than the lengths of the front end 11 and the tail end 13.
[0043] Optionally, the front end 11 accounts for 25%-30% of the total length of the stem 1, the middle section 12 accounts for 40%-50% of the total length of the stem 1, and the tail end 13 accounts for 20%-35% of the total length of the stem 1.
[0044] Bone defects or osteonecrosis of the femur in the hip joint often occur at the femoral neck. During the operation, the middle section 12 of the bone defect implantation device of Embodiment 1 of this utility model is implanted into the femoral neck. The length of the middle section 12 is about half of the total length of the shaft 1. This facilitates full contact between the middle section 12 and the bone defect area of the femoral neck, promotes blood supply and nutrient exchange in the bone defect area, and promotes bone tissue growth.
[0045] In Embodiment 1 of this utility model, the front end 12 of the bone defect implantation device is fixed to the femoral head, and the rear end 13 is fixed to the lateral side of the femur. The bones of the femoral head and the lateral side of the femur are relatively hard. Therefore, the lengths of the front end 11 and the rear end 13 are set to be approximately the same to ensure that both ends of the implantation device are stably fixed to the bone.
[0046] In the first embodiment of this utility model, the cadre 1 is screw-shaped.
[0047] Optionally, the organ 1 is provided with an axial cavity 14 extending from the front end 11 to the rear end 13 of the bone defect implantation device. The cavity 14 is used to insert a guide pin, thereby facilitating intraoperative guidance and precise control of the implantation direction and position.
[0048] Optionally, the outer surface of the front end 11 is provided with a threaded structure. By providing a threaded structure at the front end 11, the bone defect implantation device is generally screw-shaped. This facilitates implantation during rotation and ensures stability of fixation to the bone after implantation. In other embodiments, the threaded structure can be replaced with a wing-shaped structure or a tenon-and-mortise structure.
[0049] Optionally, the tail end 13 is provided with a tail cap 2, and the bottom surface of the tail cap 2 is provided with an inner locking hole 21 in the center. Optionally, the inner locking hole 21 is hexagonal or quincunx-shaped, and is used for rotational implantation with a special instrument. This application does not impose specific limitations on the structure of the inner locking hole 21, as long as it can be connected to the rotational drive instrument.
[0050] Optionally, the front end 11 is provided with a cutting groove 111. This provides self-tapping force for the insertion process of the bone defect implantation device, facilitating implantation.
[0051] In the first embodiment of this utility model, the bone defect implantation device is prepared by 3D printing in one piece.
[0052] The bone defect implant is made of absorbable material. The absorbable material is polylactic acid.
[0053] The bone defect implantation device of Embodiment 1 of this utility model can be used alone or in combination with temporary fixation devices such as external fixation brackets.
[0054] Example 2
[0055] Embodiment 2 of this utility model provides a bone defect implantation device for internal fixation of fractures and minimally invasive surgery for bone defects, such as... Figure 3 and Figure 4 As shown. The bone defect implantation device includes a shaft 1, which has a porous structure and includes a front end 11, a middle section 12 and a tail end 13 connected in sequence; the porosity of the middle section 12 is greater than that of the front end 11 and the tail end 13.
[0056] The bone defect implantation device of Embodiment 2 of this utility model has a porous structure in the trunk 1. After implantation, it can inhibit bone resorption, stimulate bone formation, reshape the bone structure of the defect area, promote fracture healing, and effectively restore the biomechanical strength of the fracture site or bone defect site. Specifically, the porosity of the sequentially connected front end 11, middle section 12, and tail end 13 is different, with the porosity of the middle section 12 being greater than that of the front end 11 and tail end 13. This allows the bone defect implantation device to match the bone quality of the implantation area, achieving both structural and functional biomimicry. The relatively large porosity of the middle section 12 of the bone defect implantation device is beneficial for blood supply and nutrient exchange in the bone defect area, promoting bone tissue growth. The relatively small porosity of the front end 11 and tail end 13 of the bone defect implantation device can enhance its effective mechanical load and strengthen the overall integration of the implantation device with the bone.
[0057] In the second embodiment of this utility model, the porous structure includes multiple micropores that penetrate the core 1.
[0058] Optionally, the porous structure of the front end 11 and the tail end 13 has a pore size of 100μm-300μm and a porosity of 30%-40%. The front end 11 and the tail end 13 are designed with low porosity, which can enhance the strength of the front end 11 and the tail end 13, ensuring that the nail is not easy to break; at the same time, it enhances the overall strength of the implantation device and its integration with the bone.
[0059] Optionally, the porous structure of the middle section 12 has a pore size of 400μm-600μm and a porosity of 70%-80%. The high porosity design of the middle section 12 facilitates blood supply and nutrient exchange in the bone defect area, promoting bone tissue growth.
[0060] In the second embodiment of this utility model, the length of the middle section 12 is greater than the lengths of the front end 11 and the tail end 13.
[0061] Optionally, the front end 11 accounts for 20%-30% of the total length of the stem 1, the middle section 12 accounts for 40%-50% of the total length of the stem 1, and the tail end 13 accounts for 20%-40% of the total length of the stem 1.
[0062] Bone defects or osteonecrosis of the femur in the hip joint often occur at the femoral neck. During the operation, the middle section 12 of the bone defect implantation device of Embodiment 2 of this utility model is implanted into the femoral neck. The length of the middle section 12 is about half of the total length of the shaft 1. This facilitates full contact between the middle section 12 and the bone defect area of the femoral neck, promotes blood supply and nutrient exchange in the bone defect area, and promotes bone tissue growth.
[0063] In Embodiment 2 of this utility model, the front end 12 of the bone defect implantation device is fixed to the femoral head, and the tail end 13 is fixed to the lateral side of the femur. The bones of the femoral head and the lateral side of the femur are relatively hard. Therefore, the lengths of the front end 11 and the tail end 13 are set to be approximately the same to ensure that both ends of the implantation device are stably fixed to the bone.
[0064] In the second embodiment of this utility model, the cadre 1 is a solid columnar structure.
[0065] Optionally, the cross-section of cadre 1 is a polygonal structure, thus providing an anti-rotation function.
[0066] Optionally, the front end 11 is angled, thereby providing guidance to facilitate intraoperative implantation of the bone defect implantation device.
[0067] In the second embodiment of this utility model, the tail end 13 of the bone defect implantation device has the same structure along its axial direction, and its length can be trimmed according to individual patient differences.
[0068] In the second embodiment of this utility model, the bone defect implantation device is prepared by 3D printing in one piece.
[0069] The bone defect implant is made of absorbable material. The absorbable material is polylactic acid.
[0070] The bone defect implantation device of Embodiment 2 of this utility model can be used alone.
[0071] The bone defect implantation device has no tail cap 2. It is implanted by tapping during the operation. The implantation device and the bone graft channel are interference fit, and it is not easy to fall off after implantation.
[0072] Depending on the fracture site and the needs of bone defect implantation surgery, the bone defect implantation device of this utility model embodiment can be used to establish a bone tunnel in a designated area using matching special instruments. The bone defect implantation device can then be implanted by tapping or rotating. The technical operation is simple, minimally invasive, requires no bone harvesting, does not affect joint replacement surgery, and is easy to promote.
[0073] Finally, it should be noted that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A bone defect implantation device, characterized in that, The device includes a core, which has a porous structure and comprises a front end, a middle section, and a tail end connected in sequence; the porosity of the middle section is greater than that of the front end and the tail end. The porous structure includes multiple micropores that penetrate the core; And / or, the pore size of the porous structure at the front end and the tail end is 100μm-300μm, and the porosity is 30%-40%; And / or, the porous structure of the middle section has a pore size of 400μm-600μm and a porosity of 70%-80%.
2. The bone defect implantation device according to claim 1, characterized in that, The length of the middle section is greater than the lengths of the front end and the tail end.
3. The bone defect implantation device according to claim 2, characterized in that, The front end accounts for 25%-30% of the total length of the stem, the middle section accounts for 40%-50% of the total length of the stem, and the tail end accounts for 20%-35% of the total length of the stem; And / or, the cadre is screw-shaped; And / or, the cadre is provided with an axial cavity.
4. The bone defect implantation device according to claim 3, characterized in that, The outer surface of the front end is provided with a threaded structure; And / or, the tail end is provided with a tail cap, and the bottom surface of the tail cap is provided with an inner locking hole in the center.
5. The bone defect implantation device according to claim 3, characterized in that, The front end is provided with a cutting groove.
6. The bone defect implantation device according to claim 2, characterized in that, The front end accounts for 20%-30% of the total length of the stem, the middle section accounts for 40%-50% of the total length of the stem, and the tail end accounts for 20%-40% of the total length of the stem. And / or, the cadre is a solid, columnar structure.
7. The bone defect implantation device according to claim 6, characterized in that, The cross-section of the cadre is a polygonal structure; And / or, the front end is provided with an angle.
8. The bone defect implantation device according to claim 1, characterized in that, The bone defect implantation device is manufactured using 3D printing in a single piece. And / or, the bone defect implantation device is made of absorbable material.
9. The bone defect implantation device according to claim 8, characterized in that, The absorbable material is polylactic acid.