Composite material for replacement of bone tissue

FIELD: medicine.

SUBSTANCE: invention relates to medicine, in particular to the field of composite materials for manufacturing endoprostheses. A composite material for replacement of bone tissue contains a porous matrix from crystalline carbon fibres with an inter-plane distance 3.58…3.62 angstrom with a content of fibres 20…80 of its total volume and a filling material, which contains crystalline carbon with an inter-plane distance 3.42…3.44 angstrom. In creation of the composite material for bone tissue replacement with an elasticity modulus, corresponding to the human bone tissue, the filling material contains obtained by Bakelite carbonisation amorphous carbon in the form of coke in an amount of 10…20% and obtained by methane decomposition crystalline carbon in an amount of 70-50% respectively of the total volume of the matrix pores.

EFFECT: composite material has the elasticity modulus, corresponding to the elasticity modulus of the human bone tissue.

1 tbl

 

The invention relates to medicine, more specifically to the field of composite materials for the manufacture of implants.

Known composite material for bone tissue substitution containing a porous matrix of fibers of crystalline carbon with the interplanar distance to 3.58...3,62 Angstrom with a fiber content of 20...80% of its total volume and the material of the filler having a crystalline carbon with the interplanar distance of 3.42...3.44 Angstrom - patent RU No. 2260402 C1, publ. 20.09.2005.

By its characteristics and the achieved result, this composite material closest to the proposed and adopted for the prototype.

Known composite material used for the manufacture of implants humans and animals and is characterized by the modulus of elasticity 14...28 GPA.

A disadvantage of the known composite material is excessively high module of elasticity, significantly higher than the actual modulus of human bone tissue.

The endoprosthesis made of a known material, more rigid in comparison with the bone tissue of a person and its interaction with the latter there is a continuous movement of the mating surfaces, which leads to a gradual loosening of the endoprosthesis and poor germination bone in his pores.

In addition, the pair of hard surfaces endop is otesa with healthy bone of a man causes a decrease of healthy bones and inhibits the creation of a new homogeneous bone.

The technical result of the invention is to provide a composite material for bone tissue substitution with a modulus of elasticity which best matches the elastic modulus of human bone tissue.

The mentioned technical result is achieved due to the fact that in the composite material for bone tissue substitution containing a porous matrix of fibers of crystalline carbon with the interplanar distance to 3.58...3,62 Angstrom with a fiber content of 20...80% of its total volume, and the material is a filler having a crystalline carbon with the interplanar distance of 3.42...3.44 Angstrom, according to the invention the material of the filler contains obtained by carbonizing a phenol-formaldehyde binder of amorphous carbon in the form of coke in the amount of 10...20% and obtained by the decomposition of the hydrocarbon gas crystalline carbon number of 70...50% respectively of the total the pores of the matrix.

The production of the composite material for bone tissue substitution are as follows. First of fibers of crystalline carbon with the interplanar distance to 3.58...3,62 Angstrom is made of a porous matrix with the content of fibrous material 20...80% of its volume, which is then impregnated with the estimated number of precursor amorphous carbon - phenol-formaldehyde binder, on the example of bakelite, and subjected to polymerization.

The obtained carbon billet is subjected to carbonization at a temperature of 1200 K for 3 hours, thus obtaining an amorphous carbon in the form of coke in the amount of 10...20% of the total pore volume of the matrix (which is an approximation of the modulus of elasticity of the composite material to the elastic modulus of human bone tissue).

After that make the pores are filled crystalline carbon with the interplanar distance of 3.42...3.44 Angstrom-70...50% respectively of the total volume of pores of the matrix by decomposition of a hydrocarbon gas such as methane, at temperatures of 1173 1273...(which ensures the compliance of the elastic modulus of the obtained composite material of human bone tissue).

The invention is confirmed by the test results presented in the table.

Why were produced samples of composite material for bone tissue substitution with different content of amorphous and crystalline carbon and conducted tests to determine the modulus of elasticity of the material of each sample.

Test results shows that the samples containing amorphous and crystalline carbon in the claimed range (experiments No. 3, 4, 5)are the moduli of elasticity as of human bone tissue, and samples containing amorphous and crystalline carbon outside of the stated limit is in (experiments No. 1, 2 and 6, 7, 8, 9)are the moduli of elasticity, which does not coincide with the bone tissue of the person.

Composite material for bone tissue substitution in comparison with the prototype is characterized by a modulus of elasticity equal to the elastic modulus of human bone tissue lying within 13,8...and 19.4 GPA.

25
no experienceThe content of amorphous carbon, %The content of crystallic. carbon, %The modulus of elasticity, GPAResult
109028,0-
258523,0-
3107019,0+
4156016,5+
5205014,1+
67013,3-
730508,1-
807022,8-
908026,4-

Composite material for bone tissue substitution containing a porous matrix of fibers of crystalline carbon with the interplanar distance to 3.58...3,62 Angstrom with a fiber content of 20...80% of its total volume and the material of the filler having a crystalline carbon with the interplanar distance of 3.42...3.44 Angstrom, characterized in that the material-filler contains obtained by carbonization of bakelite amorphous carbon in the form of coke in the amount of 10...20% and obtained by the decomposition of methane crystalline carbon number of 70...50% respectively of the total volume of pores of the matrix.



 

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