CN220175320U - Backbone defect filling fusion body based on personalized 3D printing - Google Patents

Abstract

The utility model discloses a backbone defect filling fusion body based on personalized 3D printing, which comprises a solid part and a porous part, wherein the solid part is circumferentially arranged around the porous part; the porous portion includes a first joint surface, a second joint surface, a third joint surface, and a back curved surface, and the first joint surface, the second joint surface, the third joint surface, and the back curved surface enclose a closed space. The second engagement surface includes a first side and a second side, the first engagement surface abutting the second engagement surface at the first side, the third engagement surface abutting the second engagement surface at the second side. The second joint surface comprises a third side and a fourth side, the back curved surface is adjacent to the second joint surface on the third side and the fourth side, and the back curved surface is adjacent to the first joint surface and the third joint surface. The filling fusion body has good matching effect with the bone defect space. The back curved surface of the filling fusion body is matched with the original bone surface of a patient, so that the growth of bone surface tissues is not affected, and the physiological characteristics and mechanical properties of the bone surface are reserved.

Description

Backbone defect filling fusion body based on personalized 3D printing

Technical Field

The utility model relates to the field of orthopedic surgical implants, in particular to a diaphysis defect filling fusion body based on personalized 3D printing.

Background

Bone defects are often caused by trauma, inflammation, tumors, or surgical debridement. The bone defect is difficult to treat, the period is long, the complications are numerous, great economic, psychological and social pressures are brought to patients, and the life quality of the patients is seriously affected. If the bone defect range reaches the critical bone defect length, namely 1.5-2.5 times of the diaphyseal peripheral diameter or more than 1/10 of the length, the maximum capacity of self-repairing of the bone is exceeded, and the defect can not heal by itself. At this point surgical intervention is required to repair the large bone defect. The current clinical approach to treating bone defects is mainly bone grafting. Bone graft materials commonly used in clinic include autogenous bone, allograft bone, synthetic biomaterials, and the like.

However, bone grafting using autologous or allogeneic bone currently suffers from varying degrees of deficiency:

autologous bone grafting is taking conditioned bone tissue from other parts of the patient's body, which can additionally increase surgical trauma and time. For patients with large bone defect volumes, it is difficult to find a satisfactory bone on their own. Therefore, the bone source of autologous bone is limited, and even the bone source cannot be found.

Allograft bone grafting may cause the spread of blood-borne diseases and the resulting immune response interfering with bone healing. In addition, allograft bone has only osteoconductive and no osteoinductive effects, and fracture healing is relatively slow after implantation.

At present, titanium alloy materials are often used as artificial bone substitutes for bone grafting in clinic, but the elastic modulus of metal materials is not matched with that of bones, stress shielding is easy to generate after implantation, and the risk of secondary fracture is increased while bone absorption is caused. At the same time, conventional machining processes do not allow the outer dimensions of the implant to match the bone defect space, resulting in wear or other unnecessary trauma.

Although the prior art can employ a bone trabecular structure or similar porous structure to adjust the modulus of elasticity to match the human bone, the strength of the porous structure presents a problem for larger bone defects (above 4 cm), affecting the stability of the implant.

Accordingly, those skilled in the art have focused on developing a personalized 3D printing-based diaphyseal defect filling fusion to solve the technical problems of the prior art.

Disclosure of Invention

In order to achieve the above object, the present utility model provides a diaphyseal defect filling fusion body based on personalized 3D printing, comprising a solid portion and a porous portion, wherein the solid portion is circumferentially arranged around the porous portion; the porous portion includes a first joint surface, a second joint surface, a third joint surface, and a back curved surface, and the first joint surface, the second joint surface, the third joint surface, and the back curved surface enclose a closed space.

Further, the second engagement surface includes a first side and a second side, the first engagement surface abutting the second engagement surface at the first side, the third engagement surface abutting the second engagement surface at the second side.

Further, the first joint surface and the third joint surface are not arranged in parallel, the first joint surface is arranged non-perpendicularly relative to the second joint surface, and the third joint surface is arranged non-perpendicularly relative to the second joint surface.

Further, the second engagement surface includes a third side and a fourth side, the back curved surface and the second engagement surface are adjacent to the fourth side at the third side, and the back curved surface is adjacent to the first engagement surface and the third engagement surface.

Further, the back curved surface intersects the first, second and third joint surfaces to form a closed back curved surface.

Further, the solid portion extends along the back curve.

Further, the solid portion includes an opening provided in a middle portion of the porous portion, the opening penetrating the porous portion in a direction perpendicular to the second joint surface.

Further, 2 of the openings are provided for receiving fasteners.

Further, the first engagement surface, the second engagement surface, and the third engagement surface are all in engagement with a plane of the bone defect space.

Further, the back curved surface coincides with the bone defect space outer surface.

Compared with the prior art, the technical scheme of the utility model has at least the following technical effects:

1. the filling fusion body provided by the utility model is manufactured based on a personalized 3D printing process, and the problem of material acquisition does not exist. Both its shape and size depend on the exact three-dimensional model reconstruction of the surgical site by the preoperative plan. Therefore, the filling fusion body has good matching effect with the bone defect space. The back curved surface of the filling fusion body is matched with the original bone surface of a patient, so that the growth of bone surface tissues is not affected, and the physiological characteristics and mechanical properties of the bone surface are reserved.

2. The filling fusion body provided by the utility model has the advantages that the elastic modulus is adjusted through the porous part of the bone trabecular structure to reduce stress shielding, and meanwhile, bone ingrowth is facilitated, so that the joint effect is improved.

3. The filling fusion body provided by the utility model is suitable for maintaining the stability of the fusion body in bone defects with the length of more than 4cm by arranging the solid parts around the porous parts in a surrounding way so as to increase the overall strength of the fusion body.

4. According to the filling fusion body, two openings for accommodating fasteners are formed in the middle of the filling fusion body, and the fusion body is fixed in an auxiliary mode through the fasteners such as screws.

The conception, specific structure, and technical effects of the present utility model will be further described with reference to the accompanying drawings to fully understand the objects, features, and effects of the present utility model.

Drawings

FIG. 1 is a schematic representation of the three-dimensional appearance of one embodiment of the present utility model;

FIG. 2 is a schematic diagram of the embodiment of FIG. 1;

FIG. 3 is a schematic side view of an embodiment of the present utility model;

FIG. 4 is a schematic diagram of the embodiment of FIG. 3;

FIG. 5 is a schematic side view of an embodiment of the present utility model;

fig. 6 is a schematic view of one embodiment of the present utility model secured to a bone.

Detailed Description

The following description of the preferred embodiments of the present utility model refers to the accompanying drawings, which make the technical contents thereof more clear and easier to understand. This utility model may be embodied in many different forms of embodiments and should not be construed as limited to the embodiments set forth herein.

Examples

Fig. 1 shows a backbone defect filling fusion based on personalized 3D printing according to this embodiment. The filling fusion is used to repair diaphyseal defects on the medial femur. Fig. 3 is a side view of this embodiment. The structure is shown in fig. 2 and 4. Comprises a solid part 1 and a porous part 2, wherein the solid part 1 is arranged around the porous part 2. The porous portion 2 includes a first joint surface 21, a second joint surface 22, a third joint surface 23, and a back curved surface 24. The first joint surface 21, the second joint surface 22 and the third joint surface 23 are all plane surfaces, and the back curved surface 24 is a non-plane curved surface. The first joint surface 21, the second joint surface 22, the third joint surface 23, and the back curved surface 24 enclose a closed space. For clarity, the second joint surface 22 is taken as a bottom surface (as viewed in fig. 2), and the outline of the present embodiment is substantially rectangular, including a first side a, a second side B, a third side C, and a fourth side D. The first engagement surface 21 abuts the second engagement surface 22 at a first side a and the third engagement surface 23 abuts the second engagement surface 22 at a second side B. The first engagement surface 21 is at a non-perpendicular angle relative to the second engagement surface 22 and the third engagement surface 23 is at a non-perpendicular angle relative to the second engagement surface 22. Preferably, the first joint surface 21 and the third joint surface 23 form an obtuse angle with respect to the second joint surface 22, so that the whole embodiment has a ship-shaped structure with the second joint surface 22 as a bottom surface.

When the second joint surface 22 is used as the bottom surface, the back curved surface 24 is disposed at the top. The back curved surface 24 adjoins the first junction surface 21 at the first side a, and forms a first curve 11 at the abutment; the back curved surface 24 adjoins the third junction surface 23 at the second side B, and forms the second curve 12 at the abutment; the back curved surface 24 adjoins the second joint surface 22 at the third side C and the fourth side D, and forms the third curve 13 and the fourth curve 14 at the adjoining points. The first curve 11, the second curve 12, the third curve 13 and the fourth curve 14 form a closed back curve as the outer contour of the present embodiment. The solid portion 1 extends along the back curve direction, i.e., the solid portion 1 is provided along the first curve 11, the second curve 12, the third curve 13, and the fourth curve 14. For filling fusion bodies used to repair diaphyseal bone defects, the size is typically large (greater than 4cm in length), so the outer contour is configured as a metallic solid structure, contributing to the overall structural strength.

An opening 15 is provided in the porous portion 2. The opening 15 extends through the filled fusion from the back curved surface 24 to the second engagement surface 22 in a direction perpendicular to the second engagement surface 22. Preferably, a plurality of openings 15 are provided. Preferably, the opening 15 is cylindrical and is provided with threads on its inner wall. The openings 15 may receive threaded fasteners (e.g., set screws) therethrough to effect securement of the present embodiment. To ensure strength at the opening 15, the opening 15 is a metal solid structure.

Both the solid portion 1 and the porous portion 2 of the present embodiment are made of titanium alloy. Preferably, the porous portion 2 is of trabecular bone structure. As shown in fig. 4, a side cross-sectional view of the present embodiment is shown. The view of the cross-section is from the second side B to the first side a. The first joint surface 21, the second joint surface 22 and the third joint surface 23 are porous structures. The back curve 24 has a porous structure in a majority of its middle area and a solid metal structure in the back curve portion. Since this embodiment is typically used for filling femoral diaphyseal defects, the size is larger (greater than 4cm in length), and the strength problem becomes more and more pronounced as the porous structure becomes larger in size and volume. The solid metal structure is thus disposed circumferentially around the filled fusion body, serving to increase the overall strength.

Fig. 6 is a schematic view showing the structure of the present embodiment when it is mounted in a femur having a bone defect. It can be seen that the bone defect space has three planes, since the bone defect that is required for surgery is created by the cutting of the surgical instrument. Through accurate preoperative planning, the size of the filling fusion cage is matched with the size of the bone defect space, so that the first joint surface 21, the second joint surface 22 and the third joint surface 23 of the embodiment are just fit with three planes of the bone defect space. Simultaneously, three joint surfaces which are jointed with the bone defect space plane are of a bone trabecular structure, which is favorable for bone cell ingrowth and provides better binding force. The shape of the back curve 24 matches the outer surface of the femoral stem, so that other tissue growth around the bone is not affected, while retaining the physical and mechanical properties of the femoral stem. For example, the solid portion 1 of the present embodiment further includes a protrusion 16 for replacing the small rotor that is originally in this position. In other similar embodiments, the back curve 24 may also be designed to match the shape of the curve of the bone defect site. A fastening screw 17 is provided in the opening 15 to achieve fixation of the filling fusion body relative to the bone defect space.

In the above description of the present utility model, it should be noted that, the words "one side" or "another side", "top surface" or "bottom surface", etc. are used to indicate an orientation or a positional relationship based on that shown in the drawings, or an orientation or a positional relationship in which the product is conventionally placed when in use, only for convenience of describing the present utility model and simplifying the description, and are not intended to indicate or imply that the referred position or element must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the words "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance. In addition, the term "parallel" or "perpendicular" does not necessarily limit the structure to strictly parallel or perpendicular in a mathematical sense, but may be formed with a certain error in an industrial production environment to form non-strictly parallel or perpendicular.

The foregoing describes in detail preferred embodiments of the present utility model. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the utility model without requiring creative effort by one of ordinary skill in the art. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.

Claims (10)

1. A backbone defect filling fusion body based on personalized 3D printing, which comprises a solid part and a porous part, and is characterized in that the solid part is circumferentially arranged around the porous part; the porous portion includes a first joint surface, a second joint surface, a third joint surface, and a back curved surface, and the first joint surface, the second joint surface, the third joint surface, and the back curved surface enclose a closed space.

2. The personalized 3D printing-based diaphyseal defect filling fusion of claim 1, wherein the second engagement surface comprises a first side and a second side, the first engagement surface abutting the second engagement surface at the first side, the third engagement surface abutting the second engagement surface at the second side.

3. The personalized 3D printing-based diaphyseal defect filling fusion of claim 2, wherein the first engagement surface is non-parallel to the third engagement surface, the first engagement surface is non-perpendicular to the second engagement surface, and the third engagement surface is non-perpendicular to the second engagement surface.

4. The personalized 3D printing-based diaphyseal defect filling fusion of claim 3, wherein the second engagement surface comprises a third side and a fourth side, the back curved surface abutting the second engagement surface at the third side and the fourth side, the back curved surface abutting the first engagement surface and the third engagement surface.

5. The personalized 3D printing based diaphyseal defect filling fusion of claim 4, wherein the back curve intersects the first, second, third engagement surfaces to form a closed back curve.

6. The personalized 3D printing based diaphyseal defect filling fusion of claim 5, wherein the solid portion extends along the back curve.

7. The personalized 3D printing based diaphyseal defect filling fusion of claim 6, wherein the solid portion comprises an opening disposed in a middle of the porous portion, the opening extending through the porous portion in a direction perpendicular to the second engagement surface.

8. The personalized 3D printing based diaphyseal defect filling fusion of claim 7, wherein 2 openings are provided for receiving fasteners.

9. The personalized 3D printing based diaphyseal defect filling fusion of claim 1, wherein the first engagement surface, the second engagement surface, and the third engagement surface are all in registry with a plane of a bone defect space.

10. The personalized 3D printing-based diaphyseal defect filling fusion of claim 1, wherein the back curved surface coincides with the bone defect space outer surface.