3D printing personalized metatarsal bone prosthesis

Abstract

The invention relates to the technical field of medical prostheses, and discloses a 3D printing personalized metatarsal bone prosthesis which comprises a prosthesis body, the prosthesis body obtains a personalized form based on patient CT data three-dimensional reconstruction, and the prosthesis body is made through 3D printing; the proximal end of the prosthesis body is provided with a connecting part for connecting bone tissues, and the surface of the connecting part is provided with a biological porous structure; the far end of the prosthesis body is provided with an articular surface, the articular surface is subjected to mirror polishing treatment, and suture holes are reserved in the far end of the prosthesis body and used for suturing an articular capsule and an articular ligament. According to the invention, precise adaptation of metatarsal bone defects is realized; the metatarsal bone far-end osteotomy surface is located at the joint part, joint capsule and ligament are reconstructed through suture holes, the metatarsal bone near-end osteotomy surface is located on the bone end face, a biological porous structure is arranged on the surface of the connecting part, the joint is reconstructed, biological healing is achieved, the operation difficulty is lowered, the operation time is shortened, the metatarsal bone defect repairing treatment effect is improved, and the metatarsal bone defect repairing time is shortened. And the pain of the metatarsal bone defect patient is relieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical prosthesis, in particular to a 3D-printed personalized metatarsal prosthesis. BACKGROUND

[0002] In the field of foot surgery, metatarsal injury (such as complex fracture nonunion, tumor resection, severe arthritis, traumatic defect, etc.) is a common and serious condition that affects the patient's walking function and quality of life. When conservative treatment is ineffective or the structure is severely damaged, partial or total metatarsal resection and implantation of a prosthesis are required for repair and functional reconstruction.

[0003] The current clinical commonly used metatarsal prosthesis scheme mainly includes: standardized finished prosthesis and temporary filling prosthesis based on bone cement forming. The standardized finished prosthesis adopts a pre-made fixed type (such as S, M, L) metal (such as titanium alloy, cobalt-chromium-molybdenum alloy) or high polymer prosthesis. The prosthesis has a relatively simple shape, limited size, mature production, and convenient use, but cannot accurately match the individualized metatarsal anatomical structure (such as length, diameter, physiological curvature, joint surface shape) of the patient, often facing the dilemma of "cutting feet to fit shoes", leading to uneven stress distribution at the prosthesis-host bone interface; and cannot reconstruct the individual-specific metatarsophalangeal joint movement trajectory and biomechanical properties, affecting the naturalness of gait, which may lead to adjacent joint degeneration, prosthesis loosening or dislocation; in addition, the host bone often needs to be greatly trimmed during the operation to adapt to the standard prosthesis, increasing the surgical trauma, bleeding volume and time. The temporary filling operation based on bone cement forming is simple, low in cost, but has the problems of insufficient mechanical properties, especially for metatarsal bones with heavy load, easy to break, sink and wear; the manual shaping precision is low during the operation, it is difficult to restore the complex anatomical structure, and the interface is also prone to loosening. SUMMARY

[0004] To solve the above problems in the prior art, the present application provides a 3D-printed personalized metatarsal prosthesis, which has individualized shape, good adaptability, good biological healing and retains joint activity.

[0005] To achieve the above technical purposes, the technical scheme adopted by the present application is:

[0006] A 3D-printed personalized metatarsal prosthesis, comprising a prosthesis body, the prosthesis body is obtained based on patient CT data three-dimensional reconstruction to obtain individualized shape, and is made by 3D printing; a connecting part is arranged at the proximal end of the prosthesis body for connecting bone tissue, and a biological porous structure is arranged on the surface of the connecting part; a joint surface is arranged at the distal end of the prosthesis body, the joint surface is subjected to mirror polishing treatment, and a suture hole is reserved at the distal end of the prosthesis body for suturing the joint capsule and joint ligament.

[0007] As a preferred technical scheme, the suture hole is distributed in multiple directions.

[0008] As a preferred technical solution, the distribution of the suture holes includes at least the inner-outer side distribution and the upper-lower side distribution.

[0009] As a preferred technical solution, the middle part of the prosthesis body is provided with long strip-shaped suture holes in the axial direction.

[0010] As a preferred technical solution, the connecting part of the proximal end of the prosthesis body is provided with a plurality of through nail holes, and the prosthesis body is fixed by screws.

[0011] As a preferred technical solution, the connecting part of the proximal end of the prosthesis body is provided with an intramedullary nail structure.

[0012] As a preferred technical solution, the surface of the intramedullary nail structure is sprayed with hydroxyapatite.

[0013] The beneficial effects of the present application are:

[0014] The 3D-printed personalized metatarsal prosthesis of the present application is based on the three-dimensional reconstruction of patient CT data to obtain personalized morphology, and is made by 3D printing to realize precise fitting of metatarsal defects; the distal metatarsal bone resection surface is located at the joint part, the joint capsule and ligament are reconstructed through the suture holes, the proximal metatarsal bone resection surface is located at the bone end surface, the connecting part surface is provided with a biological porous structure, the joint is reconstructed and biological healing is achieved, the surgical difficulty and time are reduced, the treatment effect of metatarsal defect repair is improved, the metatarsal defect repair time is shortened, and the pain of metatarsal defect patients is alleviated. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0016] Figure 1 is a front view structural schematic diagram of an embodiment of the present application;

[0017] Figure 2 is a rear view of Figure 1 ;

[0018] Figure 3 is a top view of Figure 1 ;

[0019] Figure 4 is a connecting schematic diagram of the embodiment shown in Figure 1 ;

[0020] Figure 5 is another structural schematic diagram of an embodiment of the present application;

[0021] Figure 6 is a top view of the embodiment shown in Figure 5 ;

[0022] Figure 7 is a radiographic image of the embodiment shown in Figure 6 implanted in vivo.

[0023] Reference signs: 1-connection part, 2-bioporous structure, 3-articular surface, 4-suture hole, 5-stitching hole, 6-nail hole, 7-intramedullary nail structure. DETAILED DESCRIPTION

[0024] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings of the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the accompanying drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present application.

[0025] A 3D-printed personalized metatarsal prosthesis, as shown in Figures 1-7 , comprises a prosthesis body, which is obtained in a personalized shape based on CT data of a patient, and is made by 3D printing to completely match the shape of the affected part; a connection part 1 is arranged at the proximal end of the prosthesis body for connecting with bone tissue, and a bioporous structure 2 is arranged on the surface of the connection part 1 for promoting bone ingrowth and bone integration to achieve biological fixation; an articular surface 3 is arranged at the distal end of the prosthesis body, and the distal end of the prosthesis body is located at the connection of the metatarsal pararticular joints, and a suture hole 4 is reserved for reconstructing the joint capsule and ligament of the metatarsophalangeal joint to balance the joint mobility and stability.

[0026] Further, the suture hole 4 is distributed in multiple directions, including at least medial-lateral distribution and superior-inferior distribution, to realize multi-directional and full-angle suturing. A long strip-shaped stitching hole 5 is further arranged in the middle of the prosthesis body for hiding the knot of the suture line when knotting, to increase the range of motion of the joint and reduce the weight of the prosthesis body.

[0027] In one embodiment, when the proximal metatarsal osteotomy is located at the tarsometatarsal joint, the connecting part 1 of the proximal end of the prosthesis body is provided with a plurality of through nail holes 6, the prosthesis body is fixed by screws, and the bone integration is promoted by the bioporous structure. In another embodiment, when the proximal metatarsal osteotomy is located at the bone section, the connecting part 1 of the proximal end of the prosthesis body is provided with an intramedullary nail structure 7, the intramedullary nail structure 7 is implanted into the host bone for fixation, the surface of the intramedullary nail structure 7 is sprayed with hydroxyapatite (HA) to promote bone integration and increase the stability and biocompatibility of the prosthesis body.

[0028] In the present application, the distal metatarsal osteotomy surface is located at the joint part, the joint capsule and ligament are reconstructed through the suture hole; the proximal metatarsal osteotomy surface is located at the bone end surface, and the biological fixation technology is adopted: the bioporous structure is arranged on the surface of the connecting part, and the screw or intramedullary nail is fixed. The present application realizes the precise fitting of metatarsal bone defect, reconstructs the joint and biologically heals, reduces the operation difficulty and operation time, improves the treatment effect of metatarsal bone defect repair, shortens the time of metatarsal bone defect repair, and relieves the pain of metatarsal bone defect patients.

[0029] The present application is the overall design, manufacture and surgical procedure of the personalized metatarsal prosthesis, which is not limited to the shape of the prosthesis body itself, and the prosthesis shape and fixation method will have slight differences for different individual bone defects, but the overall design idea and process belong to the scope of the present application.

[0030] Of course, the present application can have other various embodiments, and those skilled in the art can make various corresponding changes and modifications according to the present application without departing from the spirit and essence of the present application, but these corresponding changes and modifications should all belong to the protection scope of the claims attached to the present application.

Claims

1. A 3D-printed personalized metatarsal prosthesis, comprising a prosthesis body, characterized in that: The prosthesis body is made by 3D printing to obtain a personalized shape based on the patient's CT data and three-dimensional reconstruction. The proximal end of the prosthesis body has a connecting part for connecting bone tissue, and the surface of the connecting part has a bioporous structure. The distal end of the prosthesis body has an articular surface, which is mirror polished. The distal end of the prosthesis body has a suture hole for suturing the joint capsule and joint ligaments.

2. The 3D-printed personalized metatarsal prosthesis according to claim 1, characterized in that: The suture holes are distributed in multiple directions.

3. The 3D-printed personalized metatarsal prosthesis according to claim 2, characterized in that: The distribution of the suture holes includes at least an inner and outer distribution and an upper and lower distribution.

4. The 3D-printed personalized metatarsal prosthesis according to claim 1, characterized in that: The prosthesis body has an axially elongated suture hole in the middle.

5. The 3D-printed personalized metatarsal prosthesis according to claim 1, characterized in that: The prosthetic body has multiple through holes at the proximal end of the connecting portion, and the prosthetic body is fixed by screws.

6. The 3D-printed personalized metatarsal prosthesis according to claim 1, characterized in that: The proximal end of the prosthesis body is designed as an intramedullary nail structure.

7. The 3D-printed personalized metatarsal prosthesis according to claim 6, characterized in that: The surface of the intramedullary nail structure is coated with hydroxyapatite.

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