Composition of black-reinforced plastic for bone defect correction

FIELD: medicine.

SUBSTANCE: composition of black-reinforced plastic for bone defect correction contains carbon-base material "ТГН"-2M and polyamide film 12/10. Additionally composition contains powdered silicon at following ratio of components wt %: carbon-base material "ТГН"-2M 57.5-62.5, powdered silicon 2.5-7.5, and polyamide film 12/10 - the rest. Particle size of powdered silicon is 20-50 mcm.

EFFECT: higher radiopacity and biocompatibility, reduced toxicity and carcinogenicity of material.

2 cl, 1 tbl, 3 ex

 

The invention relates to medicine, namely to oral and maxillofacial surgery, and can be used to correct bone defects.

Known composition of the carbon fiber to correct bone defects "ASTEC", which contains carbon fabric TGN-2M, polyamide film 12/10 in the following ratio, wt.%:

Carbon fabric TGN-2M65
Polyamide film 12/1035

representing the press pack, consisting of alternating between the carbon cloth TGN-2M, 100×100×034-7 layers; polyamide film 12/10 in the form of a film of 100×100×0.2 to 7 layers (TU 48-4807-22989).

However, this material "ASTEC" for all its positive qualities has one serious drawback - it radiolucent with all the ensuing consequences: when Troubleshooting various bone defects in humans carbon material "ASTEC" during the control study x-ray images and CT scanning of the carbon material is not rendered. In the postoperative period it is impossible to trace the fate of carbon implants placed during the operation.

The closest to the invention is a composition of carbon to eliminate defecto the bone, containing carbon fabric brand TGN-2M polyamide film 12/10, the metal powder of boron in the following ratio, wt.%:

Carbon fabric TGN-2M45-65
The boron metal powder with a particle size of 20-50 microns2-20
Polyamide film 12/10rest

[RF patent N 2241495, A61L 27/08 A61F 2/28, 2003]

The disadvantage of carbon with boron powder is that it is badly visible on the spiral computer tomography and not visible at all when x-ray examination, which complicates the postoperative monitoring of installed carbon material in the human body. Also in the study of patients on spiral computed tomography increases the radial load several times. The boron powder in large quantities is toxic to living organisms.

The technical result of the present invention is to increase rentgencontrastnoe and biocompatibility, reduce the toxicity of the material.

The technical result is achieved by the fact that the composition of the carbon fiber to correct bone defects containing carbon fabric TGN-2M, polyamide film 12/10, the distinguishing feature is that it additionally contains poro is OK silicon in the following ratio of components, wt.%:

Carbon fabric TGN-2M57,5-62,5
The silicon powder2,5-7,5
Polyamide film 12/10rest

It is desirable that the particle size of the silicon powder was 20-50 microns.

The proposed structure of the carbon fiber has high physical and mechanical properties, high use of rotary instruments, not toxic, not carcinogenic, more biocompatible.

Silicon has a density of 2,328 g/cm3chemically passive element is oxidized in air at temperatures above 400°C. these temperatures does not form any connections with the total flora, is not soluble either in acid or alkali, high atmospheric stability. Silicon was added in powder form 2.5 to 7.5% in the press pack and held thermomechanical processing on the following technologies, which maintains the original properties of the silicon powder.

Example 1.

The material was obtained as follows: 62,5 g carbon fabric brand TGN-2M shift 35 g of polyamide film 12/10, between which evenly distribute 2.5 g of silicon powder with a particle size of 20-50 microns. Thus, the obtained material consisting of alternating between the layers of carbon fabric brand TGN-2M, 100×100×0,34-7 layers; the floor of the amide film 12/10 100× 100×0.2 to 7 layers and silicon powder 20-50 microns, uniformly distributed between the fabric and polyamide film, is subjected to hot pressing at a temperature of 210±5C°, a pressure of 100 kg/cm2and the shutter speed is 1 hour. Properties of carbon fiber are shown in table.

Example 2.

Material consisting of 60 g of carbon fabric brand TGN-2M, shift 35 g of polyamide film 12/10 and 5 g of a silicon powder with a particle size of 20-50 μm, respectively, subjected to hot-pressing as in example 1. Properties of carbon fiber are shown in table.

Example 3.

Material consisting of 57.5 g of carbon fabric brand TGN-2M, shift 35 g of polyamide film 12/10 and 7.5 g of a powder of silicon, respectively, subjected to hot-pressing as in example 1. The ratio of the material components is 57.5:35:7,5 respectively. Properties of carbon fiber are shown in table.

Technological equipment allows us to produce blanks of size 20×200×300 mm, made of implants, machining according to drawings or casts applied individually to the patient.

Adding more than 7.5% of silicon powder begin to deteriorate specified properties of the carbon material and it is not recommended to make changes in the biological media of the human body, if you add less than 2.5% of silicon powder, the material will not retenant astim and the surgeon will not be able to trace its fate, the degree of wear.

Physico-mechanical properties of CFRP "ASTEC", "Osaka" with boron and Osaka with silicon
№p/pProperties"ASTEC""ASTEC" with the addition of boron"Ostec with silicon
2%4%6%8%12%15%2,5%5%7,5%
1Density, g/cm31,161,181,201,231,261,331,361,201,281,31
2Porosity, %36,933,730,126,2a 21.516,814,7of 21.218,115,8
3The modulus of elasticity, MPa×1031,831,91,941,971,992,022,053,843,713,35
4Strength, MPa bending49,6a 50.551,351,552,654,1of 56.462,360,657,8
compression13,114,616,317,919,2of 21.222,724,926,328,1

The table shows that in the comparative analysis of the material "ostec and ASTEC with additions of boron and proposed composition "ostec with the addition of silicon density of the material in the proposed structure more than in the known plastics "ASTEC". Also the table shows that increasing the percentage of additives of boron and silicon, the density of the material increases, the porosity decreases, the modulus of elasticity increases, the compressive strength and bending also increases. Thus the proposed structure with the addition of silicon (density visualization on a scale of Hounsfield 400-500 units) in comparison with the known "ostec with additions of boron (density visualization on a scale of Hausfeld 70-150%) has a greater use of rotary instruments. "ASTEC" no additives does not have the use of rotary instruments (density visualization on a scale of Hausfeld 0 ed). The boron content in the article "ostec with additives of boron reaches 12-15%, which negatively affects namesometimes material, the toxicity and Carcinogenicity. Moreover, the visualization of this material is possible only when using spiral computed tomography, while the radial load increases several times. In addition, increases the cost of radiodiagnostics. The proposed composition at a lower silicon content has a good visualization using x-ray methods, increasing the biocompatibility, lack of toxicity and Carcinogenicity, no corrosion phenomena, resistance to fatigue damage, low amount of wear and elasticity is close to the elasticity of the bone and close to the conductivity of the tissues of the human body.

1. The composition of carbon for the removal of defects of bone, containing carbon fabric brand TGN-2M and polyamide film 12/10, characterized in that the composition additionally contains a powder of silicon in the following ratio, wt.%:

carbon fabric TGN-2M57,5-62,5
the silicon powder2,5-7,5
polyamide film 12/10rest

2. The composition of the carbon fiber to correct bone defects according to claim 1, characterized in that it contains a silicon powder with a particle size of 20-50 microns.



 

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