A multi-functional 3D printed bone plate for pelvic repair and its manufacturing method

Abstract

A multifunctional 3D printed bone plate for pelvic repair, which relates to the field of medical devices; its structure includes a main body part, a hollow filling block, fixing holes, an acetabular bone grafting part and an extension plate. A number of fixing holes are provided inside both the main body part and the extension plate. The left part of the main body part is connected to the hollow filling block, the bottom of the main body part is connected to the left side of the acetabular bone grafting part, and the right side of the acetabular bone grafting part is connected to the top of the extension plate. The manufacturing method of the present invention includes scanning CT images, establishing an integrated bone plate model, 3D printing the bone plate, and coating a biological coating. The multifunctional 3D printed bone plate for pelvic repair of the present invention is an integrated bone plate that combines the functions of a bone plate, a surgical guide plate and bone grafting, and can simultaneously achieve the effects of positioning, bone connection and bone grafting. The hollow part can achieve the bone grafting function and promote the healing of fractures, bone cracks and bone tissue defects. The manufacturing method of the present invention can create personalized bone plates.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and particularly to a multifunctional 3D printed bone plate for pelvic repair and a manufacturing method thereof. Background Art

[0002] A bone plate refers to a plate-shaped fracture internal fixation device with holes. Clinically, it is often used in combination with bone screws or bone wires. Existing bone plates are all straight plates. For example, the metal bone plates specified in the YY0017-2008 standard stipulate that there are two types of metal bone plates, straight and irregular. However, regardless of the type of metal bone plate, the bone plate is plate-shaped and lies in a plane.

[0003] For skeletal problems such as pelvic fractures, bone cracks, and bone tissue defects, internal fixation methods are generally used currently, and bone plates are used as treatment tools. Doctors judge the injured part of the patient through X-rays, and then select a commercially available bone plate for surgery according to the bone condition. Commercially available bone plates are general-purpose bone plates, and their shapes are generally straight plates. During the operation, doctors need to position according to experience and manually bend according to the shape of the patient's bone temporarily, which is highly dependent on the proficiency of the doctor's surgical operation, and it is inevitable that the positioning is inaccurate; or the situation of excessive bending resulting in the fracture of the bone plate occurs, causing waste of resources; or the bone plate still cannot fit the shape of the patient's bone after bending, affecting the treatment effect, and in severe cases, leading to the failure of the operation and causing secondary injury to the patient. In addition, medical devices on the market currently have single functions, and each function requires a corresponding medical device. For example, the implantation of autologous bone fragments requires an additional fixing device, the surgical steps are complicated, and the operation time is long. Summary of the Invention

[0004] One of the purposes of the present invention is to provide a multifunctional 3D printed bone plate for pelvic repair to avoid the deficiencies in the prior art. This bone plate is an integrated bone plate integrating the functions of a bone plate, a surgical guide plate, and bone grafting. Another purpose of the present invention is to provide a manufacturing method for a multifunctional 3D printed bone plate for pelvic repair, which can customize a suitable bone plate according to the different damaged conditions of different people.

[0005] One of the purposes of the present invention is achieved through the following technical solutions:

[0006] A multifunctional 3D printed bone plate for pelvic repair, comprising a main body part, a hollow filling block, an acetabular bone grafting part and an extension plate. A number of fixing holes are provided inside the main body part and the extension plate. The left part of the main body part is connected to the hollow filling block, the bottom of the main body part is connected to the left side of the acetabular bone grafting part, and the right side of the acetabular bone grafting part is connected to the top of the extension plate. The main body part, the hollow filling block, the acetabular bone grafting part and the extension plate are of an integral structure. The included angle formed between the first plane where the acetabular bone grafting part and the extension plate are located and the second plane where the main body part and the hollow filling block are located is an obtuse angle.

[0007] Preferably, the main body part is a C-shaped sheet plate with irregular arches, and the overall shape of the main body part fits the arcuate line of the patient.

[0008] Preferably, the thickness of the main body part is 0.5 - 1.5 cm, the thickness of the connection part between the bottom of the main body part and the acetabular bone grafting part is 1 - 2 cm, the connection part and the surface of the main body part are in smooth transition, and 1 to 5 fixing holes are provided inside the main body part.

[0009] Preferably, the part of the hollow filling block close to the pelvic side surface is flush with the surface of the main body part during use, and the shape of the part of the hollow filling block for implanting bone tissue close to the iliac wing surface is the same as the shape of the iliac fossa surface of the patient during use.

[0010] Preferably, the acetabular bone grafting part is an ellipsoidal shape consistent with the shape of the iliopubic eminence, and the thickness of the acetabular bone grafting part is 1 - 2 cm.

[0011] Preferably, the shape of the extension plate is a sheet with an arch, the thickness of the extension plate is the same as the thickness of the main body part, the extension plate covers the pubis and 1 to 3 fixing holes are provided inside the extension plate.

[0012] Preferably, the fixing hole is one of a circular hole, a waist-shaped hole, an elliptical hole and a polygonal hole, and the aperture of the fixing hole is 0.3 - 0.5 cm.

[0013] Preferably, the structures of the hollow filling block and the acetabular bone grafting part are both hollow structures formed by stacking multiple unit structures end to end, and the gap between the hollow spaces of the unit structures is 0.2 - 0.5 cm.

[0014] The second object of the present invention is achieved through the following technical solutions:

[0015] A manufacturing method of a multifunctional 3D printed bone plate for pelvic repair, comprising the following steps:

[0016] S1. Scan the bone part of the patient to obtain the CT image of the bone part of the patient;

[0017] S2. Establish an integrated bone plate model according to the bone condition of the patient in the CT image;

[0018] S3. Select a suitable 3D printer to print the integrated bone plate according to the size of the bone plate model;

[0019] S4. Coat the surface of the integrated bone plate with a biological coating that is beneficial to bone growth.

[0020] Preferably, in the step S3, the processing material for 3D printing is metal powder that meets the requirements of implants, and the metal powder is one of titanium alloy powder or medical stainless steel powder.

[0021] Advantages of the present invention: The multifunctional 3D printed bone plate for pelvic repair of the present invention is a bone plate that integrates a bone plate, a surgical guide plate, and a bone graft. It can simultaneously achieve the effects of positioning, bone connection, and bone grafting. The hollow part can achieve the bone grafting function and promote the healing of fractures, bone cracks, and bone tissue defects; the overall shape of the bone plate is consistent with the pelvic shape, achieving positioning upon placement. Doctors can directly drill the bone at the position of the fixing holes after adjusting the position. One bone plate realizes three functions, improving the treatment effect, promoting the recovery of patients, reducing the operation time and the operation burden of doctors, and reducing the risk of bone screw detachment caused by the inconsistent shape of the bone plate and the bone.

[0022] Furthermore, the manufacturing method of the multifunctional 3D printed bone plate for pelvic repair of the present invention is based on the existing 3D printing technology and can create personalized bone plates according to the different damaged conditions of different people. This bone plate better fits the shape of the human bone, reduces stress concentration during use, and at the same time reduces the error caused by doctors manually adjusting the bone plate during the operation. Description of the Drawings

[0023] The invention is further described with the accompanying drawings, but the embodiments in the drawings do not constitute any limitation to the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to the following drawings without creative efforts.

[0024] Figure 1 It is a schematic structural view of the multifunctional 3D printed bone plate for pelvic repair of the present invention.

[0025] Figure 2 It is a schematic structural view of another perspective of the multifunctional 3D printed bone plate for pelvic repair of the present invention.

[0026] Figure 3 It is a schematic structural view when the multifunctional 3D printed bone plate for pelvic repair of the present invention is combined with the pelvis.

[0027] Figure 4It is a schematic structural diagram of the connection of the unit structure of a multifunctional 3D printed bone plate for pelvic repair according to the present invention.

[0028] The figure includes:

[0029] 1. Main body part; 2. Hollow filling block; 3. Fixing hole;

[0030] 4. Acetabular bone graft part; 5. Extension plate; 6. Unit structure. Specific implementation mode

[0031] The present invention will be further described in conjunction with the following embodiments.

[0032] A multifunctional 3D printed bone plate for pelvic repair in this embodiment, referring to Figures 1 to 4 , includes a main body part 1, a hollow filling block 2, an acetabular bone graft part 4 and an extension plate 5. A number of fixing holes 3 are provided inside both the main body part 1 and the extension plate 5. The left part of the main body part 1 is connected to the hollow filling block 2, the bottom of the main body part 1 is connected to the left side of the acetabular bone graft part 4, and the right side of the acetabular bone graft part 4 is connected to the top of the extension plate 5. The main body part 1, the hollow filling block 2, the acetabular bone graft part 4 and the extension plate 5 are of an integral structure. The included angle formed between the first plane where the acetabular bone graft part 4 and the extension plate 5 are located and the second plane where the main body part 1 and the hollow filling block 2 are located is an obtuse angle.

[0033] The main body part 1 is a C-shaped sheet with an irregular arch. The overall shape of the main body part 1 matches the arcuate line of the patient, providing a shape structure for positioning and guiding. The shape of the irregular arch matches the arch of the acetabulum.

[0034] The thickness of the main body part 1 is 1 cm, and the thickness at the connection between the bottom of the main body part 1 and the acetabular bone graft part 4 is 1.5 cm. The connection between the two is smoothly transitioned with the surface of the main body part 1. There are 5 fixing holes 3 inside the main body part 1. The thickness of the main body part 1 being 1 cm conforms to the thickness of a general bone plate, and at the same time, the thickness at the connection with the acetabular bone graft part 4 below is 1.5 cm to ensure the connection strength. The gradual smooth transition can avoid the appearance of stepped corners.

[0035] The part of the surface of the hollow filling block 2 close to the pelvic side is flush with the surface of the main body part 1. The shape of the hollow filling block 2 close to the surface of the iliac wing for implanting bone tissue is the same as the surface of the iliac fossa of the patient. It provides a shape structure for positioning and guiding.

[0036] The acetabular bone graft part 4 is an ellipsoidal shape consistent with the shape of the pubic eminence, and the thickness of the acetabular bone graft part 4 is 1.5 cm. It is convenient for the growth and shaping of acetabular bone grafts.

[0037] The extension plate 5 is in the shape of a flake with an arch. The arch structure of the extension plate 5 matches the arch of the acetabulum. The thickness of the extension plate 5 is the same as that of the main body part 1. The extension plate 5 covers the pubis and there are 1 to 3 fixing holes 3 inside the extension plate 5. The function of the extension plate 5 is to provide enough space to set the fixing holes 3 so that the whole implant can be better fixed in the human body.

[0038] The fixing hole 3 is a circular hole. The aperture of the fixing hole 3 is 0.4 cm. The fixing hole 3 that plays a fastening and guiding role is used in combination with a 3.5 mm medical bone nail. Through the cooperation of the medical bone nail and the fixing hole 3, the fixation of the bone plate is realized.

[0039] The structures of the hollow filling block 2 and the acetabular bone grafting part 4 are hollow structures formed by multiple unit structures 6 connected end to end in an overlapping manner. The gap between the hollows of the unit structure is 3.5 cm. The unit structure 6 is provided with four centrally symmetric convex rods, and adjacent unit structures 6 are connected end to end through the convex rods.

[0040] The usage method of a multifunctional 3D printed bone plate for pelvic repair in this embodiment is as follows: First, select the correct approach method according to the injured position, make an incision, and expose; implant the patient's autogenous bone tissue into the hollow filling block 2 and the acetabular bone grafting part 4 respectively; place the main body part 1 into the patient's body; adjust the position of the main body part 1 so that the rear surfaces of the main body part 1 and the hollow filling block 2 and the inner surface of the acetabular bone grafting part 4 are all in contact with the patient's pelvis to achieve rapid positioning; fix the position of the bone plate. At the same time, the bone plate plays a guiding role, and use a medical bone drill to drill holes at the positions located by the fixing holes 3; use 3.5 mm bone screws matching the holes to fix at the fixing holes 3 so that the bone plate is firmly installed in the patient's body; then perform the next operation until the operation is successful.

[0041] A multifunctional 3D printed bone plate for pelvic repair in this embodiment is an integrated bone plate integrating the functions of a bone plate, a surgical guide plate, and bone grafting. The hollow part can realize the bone grafting function and promote the healing of fractures, bone cracks, and bone tissue defects; the overall shape of the bone plate is consistent with the pelvic shape, realizing positioning upon placement. Doctors can directly drill the bone at the position where the fixing hole 3 is located after adjusting the position. One bone plate realizes three functions, improving the treatment effect, promoting the patient's recovery, reducing the operation time and the operation burden of doctors, and reducing the risk of bone screw shedding caused by the inconsistent shape of the bone plate and the bone.

[0042] The manufacturing method of a multifunctional 3D printed bone plate for pelvic repair in this embodiment includes the following steps:

[0043] S1. Scan the patient's bone part to obtain the CT image of the patient's bone part;

[0044] S2. Establish an integrated bone plate model according to the bone condition of the patient in the CT image;

[0045] S3. Select a suitable 3D printer to print the integrated bone plate according to the size of the bone plate model;

[0046] S4. Coat the surface of the integrated bone plate with a bio - coating that is beneficial to bone growth.

[0047] In the step S3, the processing material for 3D printing is metal powder that meets the requirements of implants, and the metal powder is specifically titanium alloy powder. The product printed with titanium alloy powder has good biocompatibility and properties similar to human bones. The product printed with 316L stainless steel powder has high strength and corrosion resistance.

[0048] The manufacturing method of this embodiment can create a personalized bone plate. This bone plate better fits the shape of the human bone, reduces stress concentration during use, and at the same time reduces the error caused by doctors manually adjusting the bone plate during the operation.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A multifunctional 3D printed bone plate for pelvic repair, characterized in that, It includes a main body part (1), a hollow filling block (2), an acetabular bone grafting part (4) and an extension plate (5). A number of fixing holes (3) are provided inside both the main body part (1) and the extension plate (5). The left part of the main body part (1) is connected to the hollow filling block (2), the bottom of the main body part (1) is connected to the left side of the acetabular bone grafting part (4), and the right side of the acetabular bone grafting part (4) is connected to the top of the extension plate (5). The main body part (1), the hollow filling block (2), the acetabular bone grafting part (4) and the extension plate (5) are of an integral structure. The included angle formed between the first plane where the acetabular bone grafting part (4) and the extension plate (5) are located and the second plane where the main body part (1) and the hollow filling block (2) are located is an obtuse angle. The main body part (1) is a C-shaped sheet with an irregular arch, and the overall shape of the main body part (1) fits the arcuate line of the patient. The thickness of the main body part (1) is 0.5 - 1.5 cm, the thickness at the connection between the bottom of the main body part (1) and the acetabular bone grafting part (4) is 1 - 2 cm, and the connection is smoothly transitioned with the surface of the main body part (1). 1 to 5 fixing holes (3) are provided inside the main body part (1). When in use, the part of the hollow filling block (2) close to the pelvic side surface is flush with the surface of the main body part (1), and the shape of the part of the hollow filling block (2) for implanting bone tissue close to the iliac wing surface is the same as the shape of the iliac fossa surface of the patient. The acetabular bone grafting part (4) is an ellipsoid with the same shape as the iliopubic eminence, and the thickness of the acetabular bone grafting part (4) is 1 - 2 cm. The extension plate (5) is in the shape of a sheet with an arch, the thickness of the extension plate (5) is the same as the thickness of the main body part (1), the extension plate (5) covers the pubis and 1 to 3 fixing holes (3) are provided inside the extension plate (5). The structures of the hollow filling block (2) and the acetabular bone grafting part (4) are both hollow structures formed by multiple unit structures connected end to end and stacked, and the gap between the unit structures is 0.2 - 0.5 cm.

2. The multifunctional 3D printed bone plate for pelvic repair according to claim 1, wherein: The fixing hole (3) is one of a circular hole, a kidney-shaped hole, an oval hole and a polygonal hole, and the aperture of the fixing hole (3) is 0.3 - 0.5 cm.

3. The manufacturing method of a multifunctional 3D printing bone plate for pelvic repair according to any one of claims 1 to 2, characterized in that, It includes the following steps: S1. Scan the bone part of the patient to obtain the CT image of the patient's bone part; S2. Establish an integrated bone plate model according to the situation of the patient's bone part in the CT image; S3. Select a suitable 3D printer to print the integrated bone plate according to the size of the bone plate model; S4. Coat a biological coating beneficial to bone growth on the surface of the integrated bone plate.

4. The manufacturing method of a multifunctional 3D printing bone plate for pelvic repair according to claim 3, characterized in that: In the step S3, the processing material for 3D printing is metal powder meeting the requirements of implants, and the metal powder is one of titanium alloy powder or medical stainless steel powder.

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