Clamping type artificial bone

Abstract

The utility model discloses a clamping type artificial bone, and belongs to the technical field of biomedical prostheses. The middle section of the clamping type artificial bone is a bone main body, and two ends are connecting ends; the middle section is in a square strip shape; the cross section of each connecting end in the width direction is in a transverse U shape, the connecting ends at the two ends of each connecting end are connected with the autogenous bone in a clamping mode, connection is firm, and displacement and looseness of the implanted artificial bone are prevented.

Description

Technical Field

[0001] The utility model discloses an artificial bone, in particular to a clamping type artificial bone, belonging to the technical field of biomedical prostheses. Background Art

[0002] Chest wall defects can be caused by various chest wall diseases, such as tumors, congenital deformities, radiation injuries, and complex infections. Since most of the above diseases require surgical resection of the lesions and the involved chest ribs, resulting in local skin, muscle, and bone defects. The current clinical view is that when the diameter of the chest wall defect is greater than 5 cm, it is necessary to use a rigid implant to reconstruct the chest wall to prevent chest wall flutter, paradoxical breathing, and / or respiratory failure. When the diameter of the defect behind the scapula is greater than 10 cm, it is necessary to reconstruct it.

[0003] Artificial materials provide good bony support for chest wall reconstruction. However, the materials currently used clinically still have various problems: poor binding ability with tissues, difficult to organically combine with tissues, and often loosening, moving, or even prolapsing in the later stage. Carbon materials have excellent biocompatibility and have been widely used in the preparation of artificial implants such as heart valves, and can also be used to repair human tendons and ligaments. However, due to the general strength and brittleness of traditional carbon materials, their further application in the field of biomedical materials is limited. Carbon fiber carbon matrix composite is a new composite material with carbon fiber reinforcing the carbon matrix, having properties such as high specific strength, high fracture toughness, corrosion resistance, high-temperature strength retention rate, and thermal shock resistance. As a biomedical material, carbon fiber carbon matrix composite has the following main advantages: (1) good biocompatibility, the overall structure is composed of carbon, and the body tissues have good adaptability to it; (2) stable in the living body, not corroded, and will not cause the diffusion of metal ions to the surrounding tissues and the degeneration of the implant material itself due to the corrosion of the physiological environment like medical metal materials; (3) having good biomechanical compatibility, very close to the elastic modulus of autologous bone, and can reduce complications such as bone resorption caused by the stress shielding effect of the prosthesis; (4) high strength, fatigue resistance, good toughness, and the material properties can be adjusted through structural design to meet specific mechanical requirements. For the above reasons, carbon fiber carbon matrix composite has become a research hotspot in the field of medical artificial bone materials.

[0004] The traditional connection method between clinical artificial bone and autologous bone is that the artificial bone is lapped on the autologous bone stump by 10 - 20 mm, and then fixed by metal screws, medical suture threads, and medical metal wires. This fixing method may cause problems such as loosening, moving, or even prolapsing due to factors such as human breathing or external impact after chest wall reconstruction, affecting the normal life of patients. Content of the Utility Model

[0005] Aiming at the defects existing in the prior art, the purpose of the present utility model is to provide a clamping type artificial bone, and the connection mode between the connection ends at both ends and the autologous bone is a clamping type connection, which is firmly connected and can prevent the displacement and loosening of the artificial bone after implantation.

[0006] A clamping type artificial bone provided by the present utility model has a bone main body in the middle section and connection ends at both ends; the middle section is in a square bar shape; the cross-section of the connection end along the width direction is a horizontally placed U shape.

[0007] The middle section of the clamping type artificial bone provided by the present utility model mainly imitates the rib, and the cross-section of the connection ends at both ends along the width direction is a horizontally placed U shape. The connection mode between it and the autologous bone is a clamping type connection, which is more firm than the existing fixing methods such as screw fixation, medical suture, and medical wire fixation, and can effectively prevent the displacement and loosening of the artificial bone after implantation.

[0008] As a preferred solution, the clamping type artificial bone is assembled by two strip-shaped structures with a concave cross-section along the width direction. This assembly method is easy to disassemble and install, greatly improving the operability of the operation.

[0009] As a preferred solution, the thickness of the strip-shaped structure is 1.0 - 3.0 mm, and the width is 9 - 18 mm. The thickness and width of the strip-shaped structure are for imitating the artificial bone, and the length is designed according to needs.

[0010] As a preferred solution, the length of the connection end is 10 - 30 mm. If the connection end is too short, it is difficult to achieve the purpose of stable fixation.

[0011] As a preferred solution, small holes are evenly distributed on the surface of the strip-shaped structure, and the hole diameter is 1.5 - 2.5 mm. As a more preferred solution, the small holes in the concave surface of the strip-shaped structure are distributed in a Z shape or an M shape. The small holes in the concave surface are mainly used for suturing between the two strip-shaped structures. Designed in a Z shape or an M shape, it is beneficial to improve the suture strength, and the small holes outside the concave surface are used for fixation with natural bone.

[0012] As a preferred solution, the clamping type artificial bone is composed of a carbon fiber carbon matrix composite material matrix and a functional coating on its surface. Choosing a carbon fiber carbon matrix composite material as the matrix, it not only has good mechanical properties and high strength, meets the structural support function of chest wall reconstruction, prevents the occurrence of paradoxical breathing, but also has good biocompatibility and can be implanted for a long time. In particular, the functional coating on its surface can improve its surface wear resistance and further improve biocompatibility. The functional coating is preferably a pyrolytic carbon coating and / or a tantalum-doped diamond-like carbon coating. The carbon fiber carbon matrix composite material is a well-known material in the industry, which uses carbon as the matrix and carbon fiber as the reinforcing phase.

[0013] The clamping type artificial bone provided by the present utility model is prepared by the following method:

[0014] 1) Weave carbon fibers into strips, then shape them into a concave strip structure, and then stitch and fix two strip structures with carbon fibers to obtain a carbon fiber preform.

[0015] 2) Impregnate the carbon fiber preform with matrix carbon by chemical vapor deposition and / or liquid impregnation to make the required carbon fiber artificial bone;

[0016] The process of chemical vapor deposition for composite matrix carbon is as follows: Place the carbon fiber preform in a deposition furnace, and at a temperature of 850 - 1300 °C, introduce a carbon-containing gas source (such as common gas carbon sources like natural gas, methane, propylene, etc.), and deposit for 10 - 100 h; The process of impregnation-pyrolysis for composite matrix carbon is as follows: The carbon fiber preform is successively subjected to resin or pitch vacuum pressure impregnation, curing, and pyrolysis treatment: The impregnation pressure is 1.0 - 5.0 MPa, the impregnation time is 2 - 10 h; The curing temperature is 160 - 230 °C, and the curing time is 10 - 50 h; The resin pyrolysis temperature is 900 - 1050 °C, the pressure is normal pressure, and the pyrolysis time is 2 - 20 h; The pitch pyrolysis temperature is 750 - 850 °C, the pressure is 50 - 200 MPa, and the impregnation time is 2 - 10 h;

[0017] 3) Machine process the carbon fiber artificial bone blank, including cutting the ends and edges and setting fixing holes;

[0018] 4) Put the machined carbon fiber artificial bone blank into a high-temperature furnace, and heat it under vacuum or protective atmosphere conditions for impurity removal treatment (this step can be selected according to needs), where the treatment conditions are: temperature 1500 - 2300 °C, heat preservation for 1 - 10 h;

[0019] 5) Prepare a pyrolytic carbon coating and / or a tantalum-doped diamond-like coating on the surface of the carbon fiber artificial bone blank to obtain the clamped carbon fiber artificial bone; The pyrolytic carbon coating is generated by chemical vapor deposition, and the generation conditions are: using a gas carbon source (such as common gas carbon sources like natural gas, methane, propylene, etc.), depositing at a temperature of 900 - 1500 °C for 10 - 50 h; The tantalum-doped diamond-like coating is generated, and the generation conditions are: the Ar gas flow rate is 20 - 100 sccm, the acetylene gas flow rate is 10 - 100 sccm, the vacuum degree is 1.0×10 -1 ~4.0×10 -1 Pa, the ion source power is 0.5 - 3 kW, the tantalum target power is 0.5 - 2 kW, the purity of the tantalum target is not less than 99.9 wt%, the workpiece negative bias voltage is 50 - 600 V, and the coating time is 1 - 5 h.

[0020] Compared with the prior art, the beneficial technical effects brought by the present utility model are:

[0021] 1) The connection between the two ends of the clamping type artificial bone and the autologous bone is a clamping connection, which is more firm than the conventional connection method and can prevent the displacement and loosening of the artificial bone after implantation.

[0022] 2) The clamping type artificial bone is made of carbon fiber carbon matrix composite material, which has good biocompatibility, can be implanted for a long time, and has high strength, meeting the structural support function of chest wall reconstruction and preventing the occurrence of paradoxical breathing phenomenon;

[0023] 3) The surface of the clamping type artificial bone has a functional coating, which can improve biocompatibility, wear resistance, etc. Description of the Drawings

[0024] Figure 1 It is a schematic structural diagram of the clamping type artificial bone.

[0025] Figure 2 It is a top view of the clamping type artificial bone.

[0026] Figure 3 It is a cross-sectional view of the clamping type artificial bone along the width direction.

[0027] Figure 4 It is a cross-sectional view of the coating of the clamping type artificial bone.

[0028] Wherein, 1 is the bone main body, 2 is the connection end, 3 is the small hole, 4 is the concave strip structure, 5 is the carbon fiber suture route, and 6 is the coating. Detailed Implementation Modes

[0029] The following specific embodiments are intended to further illustrate the present invention in conjunction with the accompanying drawings of the specification, rather than limiting the protection scope of the claims.

[0030] Embodiment 1

[0031] The schematic structural diagram of the clamping type artificial bone is as Figures 1 to 4 shown. The clamping type artificial bone is assembled by two strip structures with a concave cross-section along the width direction. The strip structure is composed of a carbon fiber carbon matrix composite material substrate and a tantalum-doped diamond-like coating on its surface, and small holes are evenly distributed on the surface of the strip structure. Among them, the small holes in the concave surface are evenly distributed in a Z shape, with a pore diameter of 1.5 mm, while the small holes outside the concave surfaces at both ends of the strip structure are evenly distributed in a straight line along the length direction, with a pore diameter of 2.0 mm. The two strip structures are symmetrically assembled and sutured by carbon fibers passing through the through holes in the concave surface, so that the two strip structures are assembled into a whole. The thickness of the middle section is 2.0 mm, the length is 10 cm, and the width is 12 mm, which is close to the shape of the human rib and is the bone main body part. The two ends thereof form connection ends, and the cross-section of the connection end along the width direction is a horizontally placed U shape. The length of the connection end is 20 mm, and the opening width is 5 mm.

[0032] The clamping type artificial bone is processed and prepared by the following method:

[0033] First, prepare the preform of the carbon fiber artificial bone. 12 bundles of 6k carbon fibers are woven into a carbon fiber strip, and the carbon fiber strip is shaped using a metal mold. The morphology of the carbon fiber strip is concave, and the two ends outside the concave surface are used as connection ends, each with a length of 20 mm. The length of the middle concave part is 10 cm, there are reserved holes in the concave surface with a pore diameter of 1.5 mm, the width of the carbon fiber strip is 12 mm, and the depth of the concave surface is 2.5 mm. After baking and shaping, it becomes a carbon fiber strip with a width of 12 mm and a thickness of 1.0 mm, and it is stitched and fixed with 6k carbon fibers. Subsequently, the carbon fiber preform is composited with matrix carbon by chemical vapor deposition to make the required carbon fiber artificial bone. The process of chemical vapor deposition compositing matrix carbon is as follows: Place the carbon fiber preform in a deposition furnace, and at a temperature of 900 °C, introduce a propylene gas source and deposit for 60 h; then perform machining on the carbon fiber artificial bone blank, including cutting the ends, edges, and fixing holes, and the size of the fixing holes is 1.8 mm. Finally, a tantalum-containing diamond-like carbon coating is prepared on the surface of the carbon fiber artificial bone blank to obtain the clamped carbon fiber artificial bone. The generation conditions of the tantalum-containing diamond-like carbon coating are as follows: the Ar gas flow rate is 40 sccm, the acetylene gas flow rate is 50 sccm, the vacuum degree is 2.0×10 -1 Pa, the ion source power is 1.5 kW, the tantalum target power is 1.2 kW, the purity of the tantalum target is not less than 99.9 wt%, the workpiece negative bias voltage is 200 V, and the coating time is 3 h.

Claims

1. A clamping type artificial bone, characterized in that: The middle section is the bone body (1), and the two ends are the connecting ends (2); the middle section is in the shape of a square bar; the cross-section of the connecting end along the width direction is a horizontally placed U shape.

2. The clamping type artificial bone according to claim 1, characterized in that: It is symmetrically assembled by two strip-shaped structures (4) with a concave cross-section along the width direction.

3. The clamping type artificial bone according to claim 2, wherein: The thickness of the strip-shaped structure is 1.0 - 3.0 mm, and the width is 9 - 18 mm.

4. The clamping type artificial bone according to claim 1, characterized in that: The length of the connecting end is 10 - 30 mm.

5. A clamping type artificial bone according to any one of claims 2 to 3, characterized in that: Small holes are evenly distributed on the surface of the strip-shaped structure, and the hole diameter is 1.5 - 2.5 mm.

6. The clamping artificial bone according to claim 5, characterized in that: The small holes in the concave surface of the strip-shaped structure are distributed in a Z shape or an M shape.

7. A clamping artificial bone according to any one of claims 1 to 4, characterized in that: It is composed of a carbon fiber composite matrix and a functional coating on its surface.

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