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Method of prevention of postoperative osteomyelitis

IPC classes for russian patent Method of prevention of postoperative osteomyelitis (RU 2343925):
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FIELD: medicine.

SUBSTANCE: for prevention of postoperative osteomyelitis use composition consisting of antimicrobial substances, dissolved in high-molecular polyvinylpyrolidone with molecular mass of 1 million. The composition is administered using a syringe into the medullar channel and in the intermuscular spaces surrounding a bone, on a measure of sealing of soft tissues after operation. Invention allows to give antimicrobial activity to tissues surrounding wound for long time at the expense of slow biodegradation of polyvinylpyrolidone and long-term diffusion of antimicrobial substances from a composition in a tissue.

EFFECT: long finding of antimicrobial substances in tissues, prevention of development of postoperative osteomyelitis.

3 tbl

 

The invention relates to medicine, namely antimicrobial chemotherapy.

Osteomyelitis remains one of the most pressing problems of traumatology and orthopedics.

Most often purulent complications observed during intraosseous the osteosynthesis (28,2%); when combined osteosynthesis with the use of several different designs in combination with bone grafting, the imposition of fixation devices (11,3%); osteosynthesis with patch on the wound plates and beams (10,0%); at the osteosynthesis screws (9.8%) and with external vneochagovogo osteosynthesis(8,4%) [1].

Analogues of the proposed method are: the use of systemic antibiotics [1] and local application of antibiotics on polymeric carriers, such as polymethylmethacrylate (PMMA) [2].

The use of these funds is not significantly reduced the above indicators number of complications in the postoperative period.

The release of gentamicin PMMA beads is slow and not in full. Bovine collagen is absorbable, good media for gentamicin, the latest fully released into the tissue with initially high concentrations.

The researchers note that the maximum concentration of gentamicin in bone and surrounding tissues can be achieved almost immediately and significantly pre is yseut minimum overwhelming concentration for most bacteria, causing orthopedic infections.

Recently attracts attention using biodegradable polymeric carriers for antibiotics. The closest analogue (prototype) of the present invention is a method of prevention of postoperative osteomyelitis in terms of osteosynthesis with the local use of the antibiotic gentamicin to biodegradation polymer carrier - collagen sponge [3].

The disadvantage of the prototype is that the bacterial action of aminoglycosides depends on their concentration, the higher is achieved in the first hours after their introduction. This explains why fast decrease of the level of gentamicin may prevent the development of postoperative bone infections (according to the authors), during the first seven days.

At the same time, the authors note that often the remaining infection becomes reproducibles within two to three weeks, raising questions about the need to develop such a method of prophylaxis of postoperative osteomyelitis, which would extend the effect of antimicrobial substances, and to provide antimicrobial activity of the tissues surrounding the wound. This was the subject of the invention.

The proposed method in terms of a single application of antimicrobial substances dissolved in a professional who ekulama polyvinylpyrrolidone with a molecular weight of 1 million, it is essential to prolong the effect of antimicrobial substances to impart antimicrobial activity to the tissues surrounding the wound for 3 weeks due to biodegradation of the polymer during this period. This ultimately leads to good clinical effect, namely the absence of inflammation in the tissues and the absence of microbial contamination of the tissues surrounding the wound.

The result of the invention is achieved due to the fact that high-molecular polyvinylpyrrolidone with antimicrobial substances is within 3 weeks in the wound (on the bone surface, intermuscular, megascale space under the skin). When this occurs, the diffusion of antimicrobial substances in the tissue surrounding the wound, which imparts antimicrobial activity, persisting for 3 weeks.

Shown in the tables following.

Table 1: antimicrobial activity of the tissues surrounding the wound, in experimental animals at 21 days after surgery. The method of diffusion in agar.

Table 2: Microbial infection of the tissues surrounding the wound, in experimental animals in the dynamics.

Table 3: Presence of inflammation in the tissues surrounding the wound in experimental animals.

The method is as follows.

Based on the high molecular weight polyvinylpyrrolidone with a molecular weight of 1 million composition is prepared with antimicro the different substances in the permitted doses [4].

Composition (fit) was introduced by syringe into the bone marrow canal and intermuscular space surrounding bone, as the suturing of soft tissues after surgery.

Based on the high molecular weight polyvinylpyrrolidone prepared 1%solution of the antibiotic amikacin and 1%solution of chemotherapeutic dioksidina.

Was reproduced in the model of experimental acute osteomyelitis [3].

In the experiment used the rabbits of the Chinchilla breed weighing 3.0 to 3.5 kg as the infective agent was applied daily culture of Staphylococcus aureus strain 209 P "Oxford".

All manipulations were carried out under intravenous hypentelium anesthesia. Under aseptic conditions from a longitudinal incision was revealing the tibial diaphysis, cortical layer was powerleveling 2 holes with a diameter of 1.0 mm at a distance of 1.0 cm and was filled with 0.1 N NaOH (50 μl) to obtain superficial necrosis of the bone. After 1 min the holes were filled with 0.5 ml of staphylococcal inoculum density of 2-108CFU/ml, and then 0.1 ml of the polymer composition. Then the holes were set pieces spokes Kirchner length of 0.5 cm Composition consisting of antimicrobial substances dissolved in the high-molecular polyvinylpyrrolidone with a molecular weight of 1 million, was injected by syringe into the bone marrow canal and intermuscular space surrounding bone,as the suturing of soft tissues after surgery. The animals were sacrificed experiment on the 7th, 14th and 21st day after the operation.

The results of the observations are given in tables 1, 2, 3. The figures in table 1 demonstrate that the antimicrobial activity of the tissues surrounding the wound, in the animals treated with the application of the proposed method.

In animals without treatment was observed phenomena of acute osteomyelitis confirmed clinically, microbiologically and morphologically (table 2-3). In the animals treated with the use of the proposed method, a clinically and morphologically revealed no signs of osteomyelitis; the same was confirmed and microbiological parameters (microbial infection of the tissues surrounding the wound): on the 7th day compared with the control seeding of bone marrow and bone was three orders of magnitude less than in the control; on the 14th day, respectively, 3 and 2; and on the 21st day was absent. In the control of infection of muscle tissue was 105bone marrow - 103bones - 102CFU/g

Thus, as can be seen from the above example, the inventive method for the prevention of postoperative osteomyelitis, in contrast to the way the prototype allows us to give antimicrobial activity surrounding the wound tissues within 3 weeks and to prevent the development of osteomyelitis.

Table 1
Cloth Antimicrobial activity (zone of inhibition, mm)
Muscle 7
Bone 11,5
Bone marrow 12,3

Table 2
Cloth Microbial colonization (CFU/1 g tissue)
CONTROL EXPERIENCE
Without treatment Treatment
7 days 14 days 21 days 7 days 14 days 21 days
Muscle tissue 6.4×105 4.1×104 2.3×105 5.9×105 6.0×102 0
Bone marrow 2,3×105 1.8×105 1.2×103 3.1×102 6.0×102 0
Bone 2,1×105 1.5×104 6.9×102 2.9×102 5.6×102 0

Table 3
Cloth CONTROL (without treatment) Clinically / morphologically EXPERIENCE with the use of antimicrobial compositions) Clinically / morphologically
7 days 14 days 21 days 7 days 14 days 21 days
Muscle
cloth
+/+ +/+ +/+ +/+ -/- -/-
Bone marrow +/+ +/+ +/+ +/+ -/- -/-
Bone +/+ +/+ +/+ +/+ -/- -/-

LITERATURE.

1. Cancer A.V. Postoperative osteomyelitis: Chapter 14. Surgical infection of musculoskeletal system. Osteomyelitis // Surgical infections: a Guide / edited by I.A. Erohina, BYR Gelfand, S.A. Shlyapnikova. - SPb: Peter, 2003. - S-749.

2. Papirov S. Pyo-septic surgery. Sofia: "Medicine and physical education, 1974. - S. 483

3. Riegels-Nielsen P., Espersen F., Rosenkrantz Hömlich L., Frimodt-Moller N. Collagen with gentamicin for prophylaxis of postoperative infection. // Acta Orthop Scand 1995; 66 (1): 69-72.

4. ON THE MAIN PAGE. Drugs is by drugs in Russia: a Handbook. - M.: Attraversare, 2005 - 1536 S.

Method of prevention of postoperative osteomyelitis with use of antimicrobial substances on the polymer carrier, wherein the composition consisting of antimicrobial substances dissolved in the high-molecular polyvinylpyrrolidone with a molecular weight of 1 million injected by syringe into the bone marrow canal and intermuscular space surrounding bone, as the suturing of soft tissues after surgery.

 

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