DEVELOPMENT OF OPTICAL TRANSDUCER ON FABRICS FOR THE APPLICATION OF LIQUID CLUSTERING USING REFLECTANCE SPECTROSCOPY

Recently, usage of fabrics as wearable device, along with their applications are increasing, one example being the detection of bio-analyzes such as blood or sweat. One method used to observe the properties of the material of a fabric is to use the Refcletance Spectroscopy, in which excitation of monochromatic light with a specific wavelength is given to a fabrics. Intensity value is then processed using the PCA method in order to obtain the pattern of the difference between each substrate. The proposed transducer optic system consists of 405nm blueviolet laser as the light source, biconvex lens, Adafruit AS7262 light detector, and Arduino. This system can only detect the difference in substrate content from the occurring light scatter. This system can be applied to various kinds of fabric wearable material with differing scatter intensity values depending on the kind of fabrics. Softer kind of fabric is proposed as material for the wearable device because it gives a high scatter intensity value and constant values in every repetation which results in better data reading.Keywords: clustering, optical, reflectance, spectroscopy, transducer, wearable.

Protamine/Heparin Optical Nanosensors based on Solvatochromism

Optical nanosensors for the detection of polyions, including protamine and heparin, have to date relied upon ion-exchange reactions involving analyte and an optical transducer. Unfortunately, due to the limited selectivity...

Piezo-Optical Transducers in High Sensitive Strain Measurements

New piezo-optical sensors based on the piezo-optical effect for high sensitive mechanical stress measurements have been proposed and developed. The piezo-optical method provides the highest sensitivity to strains compared to sensors based on any other physical principles. Piezo-optical sensors use materials whose parameters practically not change under load or over time, therefore piezo-optical sensors are devoid of the disadvantages inherent in strain-resistive and piezoelectric sensors, such as hysteresis, parameters degradation with time, small dynamic range, low sensitivity to strains, and high sensitivity to overloads. Accurate numerical simulation and experimental investigations of the piezo-optical transducer output signal formation made it possible to optimize its design and show that the its gauge factor is two to three orders of magnitude higher than the gauge factors of sensors of other types. The cruciform shape of the transducer photoelastic element made it possible to significantly increase the stresses in its working area at a given external force. Combining compactness, reliability, resistance to overloads, linearity and high sensitivity, in terms of the all set of these parameters, piezo-optical sensors significantly surpass the currently widely used strain-resistive, piezoelectric and fiber-optic sensors and open up new, previously inaccessible, possibilities in the tasks of measuring power loads.

Arthroscopic laser surgery combined with intraosseous infiltration of autologous platelet-rich plasma in the treatment of knee osteoarthritis

Purpose. To improve the cure of knee osteoarthirtis using a combination of arthroscopic laser surgery and intraosseous infiltration of autologous platelet-rich plasma (PRP). Material and methods. 32 patients (18 men and 14 women) with osteoarthrosis (OA) of the knee joint, degree II–III (by Kellgren–Lawrence classification), participated in the study. By MRI findings, all patients had meniscus and cartilage damage. The arthroscopic intervention was done with laser device «LSP IRE Polyus», wavelength 0.97 mkm. In addition to the arthroscopy, patients were made extra-articular intraosseous infiltration of autologous platelet-rich plasma topically into the altered subchondral bone under the control of an electronic optical transducer (OEC Fluorostar 7900 COMPACT 2). The evaluation of treatment efficacy was made using WOMAC and KOOS knee function assessment scales, as well as VAS scale (pain intensity) before surgery and 1 and 3 months after the treatment beginning. Results. In 3 months, WOMAC scale showed the improved knee joint function by 25.38 points, KOOS scale – by 37.4 points and VAS scale – by 35 points (p < 0.01). Thus, the performed curative technique increased the support capacity, range of motion in the knee joint, less pain – all these contributed to the achievement of prolonged effect.

Microbubble Resonators for All-Optical Photoacoustics of Flowing Contrast Agents

In this paper, we implement a Whispering Gallery mode microbubble resonator (MBR) as an optical transducer to detect the photoacoustic (PA) signal generated by plasmonic nanoparticles. We simulate a flow cytometry experiment by letting the nanoparticles run through the MBR during measurements and we estimate PA intensity by a Fourier analysis of the read-out signal. This method exploits the peaks associated with the MBR mechanical eigenmodes, allowing the PA response of the nanoparticles to be decoupled from the noise associated with the particle flow whilst also increasing the signal-to-noise ratio. The photostability curve of a known contrast agent is correctly reconstructed, validating the proposed analysis and proving quantitative PA detection. The experiment was run to demonstrate the feasible implementation of the MBR system in a flow cytometry application (e.g., the detection of venous thrombi or circulating tumor cells), particularly regarding wearable appliances. Indeed, these devices could also benefit from other MBR features, such as the extreme compactness, the direct implementation in a microfluidic circuit, and the absence of impedance-matching material.

RESULTS OF SURGICAL TREATMENT OF CALCANEAL FRACTURES IN PATIENTS WITH DIABETES MELLITUS

One of the complicated problems of traumatology in the treatment of patients with calcaneal fractures is prevention of diabetes mellitus consequences. The work presents the analysis of treatment results of 72 patients with calcaneal fractures treated by means of surgical method at the Traumatological Adult Department, of the Regional Clinical Hospital “Emergency Rescue Hospital” (ERH), Chernivtsi, for the period from 2011 to 2018. With the purpose to examine the efficacy of treatment of calcaneal fractures all the patients were distributed into three clinical groups, patients with diabetes mellitus were isolated, and remote results of treatment were compared. Therefore, analysis of surgical treatment remote results of intra-articular calcaneal fractures in patients suffering from diabetes mellitus demonstrated that application of closed reposition under electrical optical transducer (EOT) control and fixation by means of wires leads to 44,38% improvement of treatment results, shortened terms of inability-to-work and disability.