RU47658U1 - PIN FOR OSTEOSYNTHESIS POLYMERIC HYBRID WITH FOUR FIRM RIGIDITY ANTI-MICROBIAL - Google Patents

Abstract

The utility model relates to medicine and can be used in traumatology and orthopedics in the treatment and correction of tubular bones. The model is a rod with four stiffening ribs, having the following dimensions: length from 100 to 500 mm, diameter of the circumscribed circle from 5 to 20 mm, made of a copolymer of vinylpyrrolidone with methyl methacrylate, capron fiber, aramid fiber terlon and calcium gluconate and having on the surface from 1 to 4 inserts with geometric dimensions: length from 50 to 500 mm, width from 1 to 3 mm, thickness from 1 to 1.5 mm, made from a copolymer of vinylpyrrolidone with methyl methacrylate and an antimicrobial substance.

Description

The utility model relates to medical equipment, namely to products used in traumatology and orthopedics.

Known metal pins used for intramedullary osteosynthesis of tubular bones, for example, Kuncher pins (Christel P., Meunier A., Abols Y. et al. Callus characteristics following intramedullar nailing with stainless steel or opoxy carbon nails. Arch. Orthop. Trauma Surg. 1984, 103, p. 131-136).

However, the use of such pins requires a repeated operation to remove them after the completion of the process of consolidation of fragments. In addition, such pins do not allow their sizes to be changed during surgery in accordance with the individual sizes of the patient’s bone fragments, and they do not allow bone fragments to be attached to them during complex comminuted fractures and do not have antimicrobial activity.

The technical task of the proposed Utility model is to create a pin capable of biodegradation within the body, which eliminates the need for a second operation, a pin that provides the ability to resize the pin directly during the operation and provides the ability to attach bone fragments to the pin in complex fragmentation fractures and capable of providing local antimicrobial act.

The technical result is achieved by the fact that the pin is made in the form of a rod with four stiffeners with the diameter described

circles of 5 to 20 mm and a length of 100 to 500 mm, which is made of a copolymer of vinyl pyrrolidone with methyl methacrylate grade PPM-1, modified nylon fiber, aramid fiber "Terlon" and calcium gluconate in the following ratio of components:

copolymer PPM-1 350-450

modified kapron

fiber 29.0-39.0 aramid fiber - thirlon 16.0-22.0 calcium gluconate 5.0-9.0

and having on the surface from one to four inserts with geometric dimensions

thickness from 0.2 to 1.5 mm width from 1 to 3 mm length from 50 to 500 mm

which are made of a copolymer of vinylpyrrolidone with methyl methacrylate PPM-1 and an antimicrobial substance in the following ratio of constituent components (% wt.)

vinylpyrrolidone copolymer

with methyl methacrylate 50-90

antimicrobial

substance 10-50

The cross section of the rod is shown in Fig. 1

The essence of the utility model is expressed in the fact that a pin made of biocompatible polymeric materials is able to gradually biodegrade in the body, is easily cut with surgical instruments and has a long antimicrobial activity.

The use of a pin made of biocompatible polymers ensures reliable fixation of bone fragments during their consolidation, does not require repeated operations to remove it due to biodegradation, ensures accurate adjustment of the pin in accordance with the individual size of the patient’s bone, which allows the earlier development of joint mobility, provides treatment for complex comminuted fractures and excludes the possibility of postoperative suppuration.

The proposed utility model operates as follows.

After reposition of the fragments, the length of the pin is changed by cutting with a scalpel in accordance with the length of the patient’s bone, and using the nozzle, the pin is inserted into the bone marrow canal. In case of comminuted fractures, the fragments are attached to the pin with metal screws or with surgical glue. After consolidation of the fracture, the screws are removed through an incision in the soft tissues.

Utility Model Manufacturing Examples

Example 1

7.0 g of prepreg, consisting of a mixture of 2.73 g (39%) of modified nylon fiber and 1.54 g (22%) of aramid fiber terlon with 2.1 g (30%) of a vinylpyrrolidone-methyl methacrylate copolymer containing 0.63 g (9%) of calcium gluconate is placed in a mold and, at a temperature of 180 ° C, a core with four stiffeners is formed with a diameter of the circumference of 5 mm and a length of 500 mm.

The method of watering from a suspension of dioxidine in an alcoholic solution of the PPM-1 copolymer on 4 faces of the pin forms 0.2 mm thick inserts 1 mm wide and 500 mm long, containing 50% dioxidine and 50% PPM-1 copolymer.

Example 2

24 g of a prepreg, consisting of a mixture of 8.88 g (37%) of a modified capron fiber and 4.8 g (20%) of aramid fiber theron with 8.4 g (35%) of PPM-1 copolymer containing 1, 92 g (8%) of calcium gluconate are placed in a mold and, at a temperature of 185 ° C, a core with four stiffeners is formed with a diameter of the circumference of 10 mm and a length of 400 mm.

The method of irrigation from a suspension of gentamicin sulfate in an alcoholic solution of the PPM-1 copolymer on two faces form inserts 1 mm thick, 1.5 (2) mm wide and 100 mm long, containing 25% gentamicin sulfate and 75% PPM-1 copolymer.

Example 3

21.8 g of prepreg, consisting of a mixture of 6.32 g (29%) of modified nylon fiber and 3.49 g (16%) of theramone aramid fiber with 10.9 g (50%) deposited on it

a PPM-1 copolymer containing 1.09 (5.0%) calcium gluconate is placed in a mold and, at a temperature of 190 ° C, a core with four stiffeners with a diameter of the described circle of 20 mm and a length of 100 mm is formed.

By watering from a suspension of cefamesin in a solution of the PPM-1 copolymer, an insert with a thickness of 1.5 mm, a width of 2 (3) mm and a length of 50 mm containing 10% cefamezin and 90% PPM-1 copolymer is formed on one face of the pin.

Claims (1)

A pin for osteosynthesis in the form of a rod, characterized in that it is made in the form of a rod with four stiffeners with geometric dimensions circle diameter from 5 to 20 mm length from 100 to 500 mm which is made of a copolymer of vinyl pyrrolidone with methyl methacrylate grade PPM-1, modified nylon fiber, aramid fiber theron and calcium gluconate in the following ratios of components, wt.%: Vinylpyrrolidone copolymer with methyl methacrylate 30.0-50.0 Modified Kapron fiber 29.0-39.0 Aramid Fiber Terlon 16.0-22.0 Calcium gluconate 5.0-9.0 and having on the surface of the faces from 1 to 4 inserts with geometric dimensions thickness from 0.2 to 1.5 mm width from 1 to 3 mm length from 50 to 500 mm which are made from a copolymer of vinylpyrrolidone with methyl methacrylate PPM-1 and an antimicrobial substance in the following ratio of constituent parts, wt.%: Vinylpyrrolidone copolymer with methyl methacrylate PPM-1 50-90 Antimicrobial substance 10-50