RU47723U1 - POLYMERIC IMPLANT FOR REPLACING AN ETI-BODY ANTI-TUBERCULAR BODIES AND DISCS - Google Patents

Abstract

The utility model relates to the neurosurgical field of medicine and can be used in the treatment of destroyed vertebral bodies and discs ..

The utility model is an octagonal cross-section, having the following dimensions:

diameter described

circumference mm from 7 to 16 length mm from 5 to 90

and made of a copolymer of vinyl pyrrolidone with methyl methacrylate, capro fiber and calcium gluconate and having on the surface from 1 to 8 inserts with geometric dimensions:

length from 5 to 80 mm width from 1 to 3.5 mm thickness from 0.5 to 1.5 mm,

made from a copolymer of vinylpyrrolidone with methyl methacrylate and an anti-tuberculosis substance.

Description

The utility model relates to medical devices, namely to products used in neurosurgery.

Known metal and ceramic implants for replacing the bodies and discs of the vertebrae (Ramikh EA, Atomanenko MG "Surgical methods in the complex treatment of fractures of the thoracic and lumbar spine." Traumatology and Orthopedics named after N.N. Priorov, 2003 , No. 3, pp. 43-48). However, the use of such implants has a number of disadvantages:

- implants are made of non-destructible material and are constantly inside the body, which causes a prolonged reaction to a foreign body;

- implants have high rigidity, significantly greater than the bone tissue of the vertebrae, which causes the resorption of adjacent areas of the bone;

- the dimensions of the implant cannot be changed during surgery in accordance with the individual dimensions of the patient;

- the implantate does not have anti-tuberculosis activity.

The technical task of the proposed utility model is the possibility of the gradual replacement of the implant with its own bone tissue and the provision of conditions that exclude the resorption of adjacent bone tissue under the influence of the implant and the possibility of changing the dimensions of the implant during the operation in accordance with the individual size of the patient, providing local anti-tuberculosis action.

The technical result is achieved by the fact that the implant is made in the form of an octagonal rod with a diameter of the circumscribed circle of 7 to 16 mm and a length of 5 to 90 mm, which is made of a copolymer of vinylpyrrolidone with methyl methacrylate grade PPM-1, modified capron fiber and calcium gluconate in the following the ratio of component parts (% wt.):

PPM-1 copolymer 30.0-50.0

Modified

nylon fiber 45.0-60.0 Calcium gluconate 5.0-10.0,

and from 1 to 8 inserts with the following dimensions are formed on the surface:

length from 5 to 80 mm width from 1 to 3.5 mm thickness from 0.5 to 1.5 mm,

consisting of a copolymer of vinylpyrrolidone with methyl methacrylate and an anti-tuberculosis substance in the following ratio of components (% wt.):

vinylpyrrolidone copolymer with

methyl methacrylate 50.0-90.0 anti-tuberculosis substance 10.0-50.0

The implant section is shown in Fig. 1

The essence of the utility model is expressed in the fact that an implant made of incompatible polymer materials is able to gradually biodegrade in the body, is easily processed with surgical instruments and has local anti-tuberculosis treatment.

The use of a polymer implant provides reliable fixation of the vertebrae, provides bone tissue regeneration throughout the entire intervertebral space, allows you to accurately simulate the size of the implant in accordance with individual

the size of the patient eliminates the complications associated with the resorption of bone tissue in contact with the implant and reduces the number of relapses of tuberculosis. The proposed utility model operates as follows. After removal of the damaged body or disc of the vertebra, the dimensions of the implant are changed by treatment with a surgical instrument in exact accordance with the distance between the intact vertebrae and the implant is implanted between them. The wound is sutured in layers. If necessary, the strength of fixation of the implant in the intervertebral space can be increased through the use of medical adhesives, for example, grades MK-7, MK-9.

Utility Model Manufacturing Examples

Example No. 1

0.7 g of the prepreg, consisting of 0.42 g (60%) of the modified capron fiber with 0.21 g (30%) of the PPM-1 copolymer containing 0.07 g (10%) of calcium gluconate, is placed in a mold and, at a temperature of 180 ° C., form a core with a diameter of the circumference of 7 mm and a length of 20 mm.

The method of irrigation from a suspension of isoniazid in an alcoholic solution of the PPM-1 copolymer on 3 faces of the implant forms inserts 0.5 mm thick, 1 mm wide and 20 mm long, containing 50% isoniazid and 50% PPM-1 copolymer.

Example No. 2

5.4 g of a prepreg consisting of 2.97 g (55%) of a modified nylon fiber with 1.94 g (36%) of a PPM-1 copolymer deposited on it containing 0.49 g (9%) of calcium gluconate, placed in the mold and, at a temperature of 185 ° C, form a core with a diameter of the circumference of 10 mm and a length of 90 mm.

By watering from a suspension of phthivazide in an alcoholic solution of the PPM-1 copolymer, an insert 1 mm thick, 2 mm wide and 80 mm long containing 25% phthivazide and 75% PPM-1 copolymer is formed on 1 face of the implant.

Example No. 3

0.8 g of prepreg, consisting of 0.36 g (45%) of a modified nylon fiber with 0.4 g (50%) of a PPM-1 copolymer deposited on it containing 0.04 g (5%) of calcium gluconate, placed in the mold and, at a temperature of 190 ° C, form a rod with a diameter of the described circle of 16 mm and a length of 5 mm

The method of irrigation from a suspension of sodium para-aminosalicylate in an alcohol solution of the PPM-1 copolymer on 8 faces of the implant forms inserts 1.5 mm thick, 3.5 mm wide and 5 mm long, containing 10% sodium para-aminosalicylate and 90% PPM- copolymer 1.

Claims (1)

Polymer implant for replacing vertebral bodies and discs in the form of a rod of synthetic material, characterized in that it is made in the form of an octagonal cross-section rod with geometric dimensions diameter of the circumscribed circle, mm from 7 to 16 length mm from 5 to 90, which is made from a copolymer of vinylpyrrolidone with methyl methacrylate grade PPM-1, modified nylon fiber and calcium gluconate in the following ratio of components, wt.%: PPM-1 copolymer 30.0-50.0 Modified Kapron Fiber 45.0-60.0 Calcium gluconate 5.0-10.0 and having on the surface of the faces from one to eight inserts with geometric dimensions length from 5 to 80 mm width from 1 to 3.5 mm thickness from 0.5 to 1.5 mm, which are made of a copolymer of vinylpyrrolidone with methyl methacrylate grade PPM-1 and an anti-tuberculosis substance in the following ratio of constituent parts, wt.%: Vinyl pyrrolidone copolymer with methyl methacrylate 50.0-90.0 Anti-TB substance 10.0-50.0