The paper describes a practical method for real-time
measurement of active power in a dielectric barrier discharge by
calculating a Lissajous figures based on the Manley formula. Such a
method is very useful for controlling the output ozone concentration
in ozone generators taking into account the active power in a DBD
reactor. A dielectric barrier discharge (DBD) in atmospheric
pressure air was excited by a high-voltage pulse power supply. The
active power of the reactor was estimated from the area of the
Lissajous figure formed by the V-Q traces, which is directly
proportional to the energy consumed per cycle at voltages of 8 and
12 kV, respectively.
Bone loss and significant acetabular defects remain one of the major problems in revision hip arthroplasty. A promising material for grafting of bone defects can be materials based on allogeneic bone after various types of processing, combining optimal properties for osteoregeneration. Objective. To analyze the results of acetabular reconstruction with bone implants «OMS-A» in the case of revision arthroplasty. Methods. The results of examination and treatment of 57 patients (33 women and 24 men) were analyzed. The patients' age at the time of hospitalization ranged from 24 to 81 years. Patients were diagnosed on the basis of a combination of clinical manifestations of the disease, laboratory data, radiography, computed tomography with 3D reconstruction. According to the classification of W. G. Paprosky, the largest group consisted of type I defects -25 patients (44 %), II -13 (23 %), . For the reconstruction of the acetabulum, 21 patients (37%) we used fragmented cortical-cancellous pieces (CGP), 28 (49 %) -volumetric bone implants (OCI), 8 (14 %) -a combination of CGP and OCI. All patients underwent revision hip arthroplasty with an anterolateral approach according to Harding. The resulting acetabular defect was tightly filled with an allografts. Results. X-ray and G. A. Gie results were assessed as good in 36 patients (63 %), satisfactoryin 14 (25 %). The manifestations of infection associated with the use of bone implants «OMS-A» have not been determined. The necessity for repeated surgery in order to restore the acetabulum occurred in 7 patients (12 %). Conclusions. Тhe clinical efficiency of bone implants «OMS-A» for the reconstruction of the acetabulum according to the classification of W. G.
In this paper we describe a compact, economical, easy to use air ozonator developed at the Institute of Plasma Physics of the NSC KIPT and manufactured in collaboration with Public Joint Stock Company «HARTRON-PLANT» LtD. Ozonator of OzD 10/0.1-type uses a surface dielectric barrier discharge to generate ozone from flowing air oxygen, has a flexible system of settings, and is an autonomous and mobile sanitary device for the disinfection of closed spaces up to 500 m3. The output ozone concentration reaches 0.1 g/m3 with productivity of 10 g/h. A microprocessor controller has been developed to control the operation of the ozonator. The results of bacteria inactivation in two various premises for surgical operations are presented.
Insufficient bone regeneration is a common issue for patients with extensive bone damage, therefore the use of allografts is required. With increasing life expectancy, there is a higher risk of bone repair issues after fractures or orthopedic surgical intervention. We studied incorporation and remodeling of structural allografts in critical size metaphyseal femur defects in 52 rats aged 3-month-old and 12-month-old who underwent surgeries creating a bone defect, which was either filled with a structural allograft (3-month-old -3moAllo; 12-month-old -12moAllo) or left empty (3-month-old -3moE; 12-month-old -12moE). Histological analyses were performed 14, 28 and 90 days after the surgery. The percentage of bone and fibrous tissues, and allograft relative to the defect area was evaluated. The transmission electron microscopy was carried out 14 days after allograft implantation. When the defect was empty, slower bone regeneration was observed in 12moE rats versus 3moE, leading to sufficient irregularities in the anatomic structure of the femur 90 days after the surgery. When a structural allograft was used, the area of the fibrous tissue was larger in the defects of 12moAllo compared with 3moAllo rats 90 days after surgery. No age-related differences were found in the allograft remodeling and structures of the osteocytes, osteoblasts, and osteoclasts over the observation period. Evident issues with bone regeneration were found in critical size defects both of 12moE and 12moAllo rats. However, the allograft use allowed the bone maintaining anatomic structure 90 days after the surgery.
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