Effectiveness of laser therapy for the treatment of lumbosacral radiculoischemias

Introduction.The study was devoted to assessing the effectiveness of laser therapy in the treatment of spondylogenic radiculoischemias. Low-intensity laser therapy and vaporization technology were used.Aim – to improve treatment and outcomes in patients with compression of the spinal roots in herniated intervertebral discs using various methods of laser therapy.Materials and methods. In two groups, the results of treatment of 225 patients with clinical manifestations of spondylogenic lumbosacral radiculoischemias were analyzed using laser therapy techniques. In 115 cases (group 1), laser treatment was performed using the method of puncture polychannel laser disk decompression. In 110 patients (group 2), low-intensity percutaneous laser therapy was used. The dynamics of the clinical and neurological manifestations of the disease was recorded: the time of pain syndrome reduction, the dynamics of motor and sensory disorders of the corresponding root, changes in parameters according to the Roland-Morris and Oswestry Disability questionnaire.Results. In both groups, an improvement in clinical and neurological manifestations was obtained: the intensity of pain syndrome according to VAS decreased in more than 70 % of the observed individuals. A significant improvement in the parameters of vital activity was revealed according to scales with a long-lasting effect (more than 12 months) with an improvement in the blood supply to the spinal roots.Conclusion. Laser radiation has significant clinical effectiveness; the important parameters are the wavelength and rate of the radiation. Structural-modifying action and improvement of microcirculation (of arterial and venous bed) are achieved. Evaluation of the effectiveness of polychannel laser puncture decompression is advisable using scales and questionnaires. Low-intensity percutaneous laser therapy and monochannel interstitial laser therapy provide a targeted antiedemic and neuroprotective effect with the possibility of dosing and control. The treatment is highly effective and improves the prognosis of the disease.

Silicon wafers separation to disk-crystals by jet-abrasive processing

The variants of application of the method of abrasive jet processing in the electronics industry are analyzed. The features of technology and equipment for dividing silicon wafers into circular disk crystals are highlighted. A comparative analysis of the results of jet-abrasive processing and cutting of silicon wafers with a laser disk is carried out.

Vidéodisque et disque optique numérique en documentation

Depuis déjà plusieurs années, l’explosion documentaire suscite de nombreuses discussions quant à la conservation, au stockage et à l’accessibilité de l’information. La fin des années 70 a vu apparaître un nouveau mode de stockage et de repérage : le vidéodisque. Qu’il se nomme vidéodisque, disque optique ou « laser disk », ce procédé s’impose de plus en plus comme une solution permanente pour « absorber » la quantité phénoménale d’information produite ou conservée par tout organisme. L’auteure présente un profil technique des vidéodisques et des disques optiques tout en jetant un regard critique sur leur avenir dans le monde de la documentation.