CN216985297U

CN216985297U - Titanium alloy microporous bone implant adopting additive manufacturing technology

Info

Publication number: CN216985297U
Application number: CN202123364767.7U
Authority: CN
Inventors: 冯强; 宋慕国; 蔡兴博; 王腾
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-12-30
Filing date: 2021-12-30
Publication date: 2022-07-19
Anticipated expiration: 2031-12-30

Abstract

The utility model relates to a titanium alloy microporous bone implant adopting an additive manufacturing technology, which comprises a cylindrical implant body, wherein intramedullary pins are arranged on two end surfaces of the implant body, and a plurality of reticular micropores are arranged on the outer surfaces of the implant body and the intramedullary pins. The micropore bone implant which adopts the additive manufacturing technology and the TC4 titanium alloy accords with the biomechanics, the shape and the size are made based on the original body CT and the magnetic resonance tomography of a patient, the safety risk of the patient can be reduced, the fusion of the organism tissue of the patient and the implant can be realized, and the adhesion and the proliferation of osteoblasts can be promoted.

Description

Titanium alloy microporous bone implant adopting additive manufacturing technology

Technical Field

The utility model relates to the technical field of orthopedic medical instruments, in particular to a titanium alloy microporous bone implant adopting an additive manufacturing technology.

Background

The traditional bone implant is limited by processes and materials, and cannot form a complex structure, so that the problem that the shape is mismatched and the clinical requirement is difficult to meet is caused, for example, the raw materials of the implant mainly comprise PEEK (polyether ether ketone) and titanium and TC4 titanium alloy, and the elastic modulus of the TC4 titanium alloy is about 1/2 of steel, so that the implant is poor in rigidity and easy to deform, an elongated rod and a thin-walled part are not suitable to be manufactured, the rebound quantity of a processing surface during cutting is large and is about 2-3 times of that of the stainless steel, severe friction, adhesion and adhesive abrasion of a rear cutter surface are caused, and poor fusion is easy to occur in a formed part; and the adherent proliferation of osteocytes is difficult to achieve with conventional bone implants, such as chinese patent invention "implant", granted publication No. CN103442665B, which comprises an articular component having a bearing surface and an opposite surface arranged to couple to a proximal neck portion of an arthroplasty implant coupled to the bone, which is a common, standard type of implant device now in use with smooth surfaces and simple structural symmetry. While additive manufacturing, otherwise known as 3D printing (3DP), has unique advantages in rapidly and precisely manufacturing implants that are porous and have complex microstructures, how to make a biomechanically compatible bone implant using additive manufacturing has been the direction of research and exploration in this field.

SUMMERY OF THE UTILITY MODEL

In view of the above problems, the present invention provides a microporous bone implant that conforms to biomechanics using additive manufacturing techniques, reduces the safety risk of a patient, and enables fusion of a patient's body tissue with the implant.

The specific technical scheme of the utility model is as follows: a titanium alloy microporous bone implant adopting an additive manufacturing technology comprises a cylindrical implant body, wherein intramedullary pins are arranged on two end faces of the implant body, and a plurality of reticular micropores are arranged on the outer surfaces of the implant body and the intramedullary pins; bone implants, primarily long bones.

Further, preferably, the intramedullary needle comprises an intramedullary needle I and an intramedullary needle II, and the intramedullary needle I and the intramedullary needle II are symmetrically arranged along the central axis of the implant body.

Further, it is preferable that the diameter of the bore of the intramedullary pin I and the intramedullary pin II is 7 to 9mm, preferably 8 mm.

Further, it is preferable that the length of the intramedullary pin I and the intramedullary pin II is 10 to 18mm, preferably 15mm, and the intramedullary pin I and the intramedullary pin II are intramedullary pins in which the implant is fixed to the bone body.

Further, preferably, the implant body comprises an implant body reinforcing needle, wherein the implant body reinforcing needle with a square cross section is arranged in the middle of the implant body; the implant reinforcing needle is rectangular, has the width of 3-5mm, preferably 3.5mm, and reinforces the strength of the implant.

Further, it is preferable that the pore diameter of the mesh-like micropores is 1 to 3 mm; preferably 2 mm.

Further, preferably, the lower end of the implant body is further provided with a steel plate, the steel plate is of a rectangular structure, and edges of two ends of the steel plate are rounded corners.

Further, preferably, the length of the steel plate is 160-180mm, preferably 180mm, and each side steel plate needs to exceed the implant by 60-70 mm; the thickness of the steel plate is 3.5-4.5mm, preferably 4 mm.

Further, preferably, 2-3 fixing screw holes are symmetrically formed in two sides of the implant body on the steel plate.

Further, preferably, the bone screw drilling device further comprises a bone screw drilling hole, and the steel plate far away from the implant body is provided with the bone screw drilling hole corresponding to the fixing screw hole; the distance between the two screws on the steel plate is 3-6mm, preferably 5mm, the set screw hole and the bone screw hole are parallel to the axis of the implant body, and the axes of the set screw hole and the bone screw hole are perpendicular to the axis of the implant body.

The utility model has the beneficial effects that: the micropore bone implant which is in accordance with the biomechanics, the shape and the size of which are made based on the original body CT and the magnetic resonance tomography of a patient by adopting the additive manufacturing technology and the TC4 titanium alloy can reduce the safety risk of the patient, can realize the fusion of the organism tissue and the implant of the patient and can promote the adhesion and the proliferation of osteoblasts.

Drawings

FIG. 1 is a schematic perspective view of a microporous bone implant made of titanium alloy according to the present invention, wherein the mesh micropores are not shown;

FIG. 2 is a front view of a microporous bone implant of titanium alloy material of the present invention, shown without reticulated pores;

fig. 3 is a partially enlarged view of an implant body, an intramedullary needle, a steel plate, etc. of the microporous bone implant of titanium alloy material of the present invention, showing the reticulated micropores of the implant body and the intramedullary needle surface.

FIG. 4 is an enlarged partial view of the set screw hole in the steel plate of the inventive microporous bone implant of titanium alloy material.

In the upper diagram: 1-implant body, 2-fixing screw hole, 3-intramedullary needle, 301-intramedullary needle I, 301-intramedullary needle II, 4-implant reinforcing needle, 5-bone screw punching, 6-reticular micropore and 7-steel plate.

Detailed Description

In order to make the technical problems and technical solutions solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

In the description of the present invention, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1:

as shown in fig. 1 and fig. 2, a titanium alloy microporous bone implant adopting an additive manufacturing technology, which is a bone implant mainly for a long bone, includes a cylindrical implant body 1, the bone shapes are basically the same, but the sizes and sizes thereof are slightly different due to the influences of age, weight, height, etc., and titanium alloy microporous bone implants of several models can be manufactured and directly selected during use (using mode of the existing universal and standard implant devices), and of course, based on the additive manufacturing technology, the size of the implant body 1 can be reconstructed based on CT and magnetic resonance tomography images of the original body of a patient through a digital three-dimensional model, and then the reconstructed implant body 1 is guaranteed to be the same as the original bone body, and is generally a solid implant.

The intramedullary needles 3 are arranged on two end surfaces of the implant body 1, the intramedullary needles 3 comprise an intramedullary needle I301 and an intramedullary needle II 302, the intramedullary needle I301 and the intramedullary needle II 302 are symmetrically arranged along the central axis of the implant body 1, the intramedullary needles 3 and the implant body 1 are integrally manufactured by adopting an additive manufacturing technology, and the diameters of the intramedullary needles I301 and the intramedullary needles II 302 are 7-9mm, preferably 8 mm; the length of the intramedullary pin I301 and the intramedullary pin II 302 is 10-18mm, preferably 15mm, and the intramedullary pin I301 and the intramedullary pin II 302 are intramedullary pins which are fixed on a bone body by an implant.

As shown in figure 3, the implant body 1 and the intramedullary needle 3 are provided with a plurality of fine reticular micropores 6 on the outer surface, the aperture is 1-3mm, preferably 2mm, so that the intact bone body of a patient can have a gap for growing in and out, and the fine reticular micropores 6 on the surface can form a channel for the growth of surrounding organism tissues to promote the fusion of the implant and the organism.

An implant reinforcing needle 4 with a square cross section is additionally arranged in the center of the middle part of the implant body 1, the implant reinforcing needle 4 is rectangular, the width is 3-5mm, preferably 3.5mm, and the strength of the implant is enhanced.

The lower end of the implant body 1 is further provided with a steel plate 7, the steel plate 7 is coplanar and extends on the side wall of the implant body 1 through a material increase manufacturing technology to form the steel plate 7 with a rectangular structure, edges of two ends of the steel plate 7 are rounded corners, friction between the bone body of a patient and an attractive steel plate is reduced, the total length of the steel plate 7 is 160-180mm, the optimal length is 180mm, and each side of the steel plate 7 needs to exceed the implant body by 60-70 mm; the thickness of the steel plate is 3.5-4.5mm, preferably 4 mm.

As shown in fig. 1, 2 and 4, 2 to 3 fixing screw holes 2 are symmetrically formed on two sides of an implant body 1 on a steel plate 7, and in this embodiment, a scheme that 3

fixing screw holes

2, and 6 fixing screw holes 2 are respectively formed on two sides is adopted.

A non-threaded cortical bone screw punching hole 5 is formed on the steel plate 7 far away from the implant body 1 corresponding to the fixing screw hole 2; the hole diameters of the fixing screw hole 2 and the bone screw punching hole 5 are 3.5-4mm, the hole diameter of the preferred bone screw punching hole 5 is 3.5mm, the distance 8 between the two screws is 3-6mm, namely the distance between the two screws on the steel plate is 3-6mm, the preferred hole diameter is 5mm, the fixing screw hole 2 and the bone screw punching hole 5 are parallel to the axis of the implant body 1, the axes of the fixing screw hole 2 and the bone screw punching hole 5 are perpendicular to the axis of the implant body 1, and the steel plate 7 is used for fixing the implant and the bone body structure.

The titanium alloy microporous bone implant adopting the additive manufacturing technology adopts TC4 titanium alloy, and the TC4 titanium alloy implant has corrosion resistance, biocompatibility, excellent mechanical property and fatigue property, high strength, strong toughness, good wear resistance in a combination body, good comprehensive mechanical property, good contact with a patient, personalized customization according to the required part of the patient, printing of a through coarse mesh structure, close to the size of a bone, promotion of adhesion and proliferation of osteoblasts, short time required in the manufacturing process, reduction of pain of the patient and the like, and has good advantages.

Example 2:

for the titanium alloy microporous bone implant described in example 1, which is primarily a bone implant for long bones, the additive manufacturing technique was used to construct the following steps:

the method comprises the following steps: based on CT or magnetic resonance tomography of an original body of a patient, the three-dimensional model implant body 1 with the same size as the original diseased bone body is ensured to be reconstructed through the reconstruction of a digital three-dimensional model, and the reconstructed implant body 1 is generally a solid implant body, so that the following steps are facilitated.

Step two: two intramedullary needles 3, i.e. an intramedullary needle I301 and an intramedullary needle II 302, with a length of 10-18mm, preferably 15mm, and a bore diameter of 7-9mm, preferably 8mm, are added on the solid implant body 1 on the basis of step one, and are combined with the solid implant body 1 addition technique of step one into one.

Step three: on the basis of the second step, the shell-drawing hollow implant body wall is fine reticular micropores 6, the aperture is 1-3mm, preferably 2mm, and the intact bone body of the patient can have gaps for growth.

Step four: and on the basis of the third step, a layer of rectangular implant reinforcing needle 4 is added in the center of the implant with the shell drawn out, so that the strength of the implant is enhanced, the width of the implant reinforcing needle 4 is 3-5mm, preferably 3.5mm, and the implant reinforcing needle is combined with the operation of the third step, so that the next step of operation is facilitated.

Step five: and on the basis of the fourth step, a steel plate 7 is formed by extending the side wall of the implant body 1 in a coplanar manner, the steel plate 7 is of a rectangular structure, the edges of the steel plate 7 are rounded corners to reduce friction between the bone body of the patient and an attractive steel plate, the total length of the steel plate 7 is 160-180mm, preferably 180mm, each side of the steel plate 7 needs to exceed the implant body by 60-70mm, the remaining bone body of the implant body is removed according to the remaining length of the bone body of the patient, and the wall thickness of the steel plate 7 is 3.5-4.5mm, preferably 4mm, so that the steel plate and the operation of the fourth step are combined to facilitate the next step of operation.

Step six: and on the basis of the fifth step, punching 3 fixing screw holes 2 at two ends of a steel plate 7 respectively, punching 1 bone screw hole 5 at two ends respectively, wherein 8 fixing screw holes are formed at one end respectively, the hole diameter is 3.5-4mm, the thread-free cortical bone screw hole is 5, preferably 3.5mm, and the distance between the two screws is 3-6mm, preferably 5 mm.

Step seven: and converting the file model into a stl format on the basis of the completion of the step six, then carrying out slicing processing, and printing by a 3D printer.

Step eight: and seventhly, taking the implant body to a hospital after printing, sterilizing, placing the implant body in the defect part of the patient, and fixing the implant body and the bone body of the human body together through screws.

Although the present invention has been described in detail with reference to the specific preferred embodiments, it should be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and any modifications, equivalents and the like within the spirit and principle of the present invention should be construed as being included in the scope of the present invention.

Claims

1. The utility model provides an adopt titanium alloy micropore bone implant of additive manufacturing technique which characterized in that, includes implant body (1) of becoming the cylinder type, implant body (1) both ends face is provided with intramedullary needle (3), implant body (1) and intramedullary needle (3) surface are provided with a plurality of netted micropores (6).

2. A titanium alloy microporous bone implant according to claim 1, wherein: the intramedullary needle (3) comprises an intramedullary needle I (301) and an intramedullary needle II (302), and the intramedullary needle I (301) and the intramedullary needle II (302) are symmetrically arranged along the central axis of the implant body (1).

3. A titanium alloy microporous bone implant according to claim 2, wherein: the diameters of the bore diameters of the intramedullary needle I (301) and the intramedullary needle II (302) are 7-9 mm.

4. A titanium alloy microporous bone implant according to claim 2 or 3, wherein: the length of the intramedullary needle I (301) and the length of the intramedullary needle II (302) are 10-18 mm.

5. A titanium alloy microporous bone implant according to claim 1, wherein: the implant body reinforcing needle is characterized by further comprising an implant body reinforcing needle (4), wherein the implant body reinforcing needle (4) with a square cross section is arranged in the middle of the implant body (1).

6. A titanium alloy microporous bone implant according to claim 1, wherein: the aperture of the reticular micropores (6) is 1-3 mm.

7. A titanium alloy microporous bone implant according to claim 1 or 5, wherein: the implant body is characterized in that a steel plate (7) is further arranged at the lower end of the implant body (1), the steel plate (7) is of a rectangular structure, and the edges of two ends of the steel plate (7) are rounded corners.

8. A titanium alloy microporous bone implant according to claim 7, wherein: the length of the steel plate (7) is 160-180mm, and the wall thickness is 3.5-4.5 mm.

9. A titanium alloy microporous bone implant according to claim 7, wherein: 2-3 fixing screw holes (2) are symmetrically formed in the two sides of the implant body (1) on the steel plate (7).

10. A titanium alloy microporous bone implant according to claim 9, wherein: the bone screw implant is characterized by further comprising a bone screw punching hole (5), and the bone screw punching hole (5) is formed in the steel plate (7) far away from the implant body (1) and corresponds to the fixing screw hole (2).