Low Power Carbon Dioxide Laser Research Articles

Low-power carbon dioxide laser irradiation reduces sclerostin expression, but stimulates Dmp-1 expression in osteocyte-like cells of rats.

Low-power carbon dioxide laser irradiation reduces sclerostin expression, but stimulates Dmp-1 expression in osteocyte-like cells of rats.

Low-power carbon dioxide laser and conventional electrosurgery in the treatment of verrucae vulgaris

Low-power carbon dioxide laser and conventional electrosurgery in the treatment of verrucae vulgaris

Correlations between Lymphocytes, Mid-Cell Fractions and Granulocytes with Human Blood Characteristics Using LowPower Carbon Dioxide Laser Radiation

In this research, the subpopulations of human blood parameters including lymphocytes, monocytes, and granulocytes were determined byelectronic sizing in the Health Centre of UniversitiSains Malaysia. These parameters have beencorrelated with human blood characteristics such as age, gender, ethnicity, blood types, body mass index, medical history, number of chronic diseases, and type of chronic diseases; before and after irradiation with 15 W carbon dioxide laser (?=10,600 nm). The correlations were obtained byfinding patterns in changes of blood parameters using paired non-parametric tests, and an independent non-parametric test using the SPSS version 17. Irradiation of blood samples with carbon dioxide lasershowedsignificant changes in lymphocytes, monocytes, and granulocytes before and after irradiation.These analysis revealed that a significant increaseinlymphocyte before and after irradiation among different body mass index (p-value = 0.031).There is significant increase in monocyte before and after irradiation between medical history (p-value = 0.052), and number of chronic diseases (p-value = 0.022).And there is significant decrease in granulocyte before and after irradiation, among different body mass index (p-value = 0.021), and number of chronic diseases (p-value = 0.018).The correlation between changes in human blood parameters and a patient’s characteristics were very much correlated and can become a significant indicator for blood analyses.This study considered as a new finding for the increase inlymphocyte, monocyte, and the decrease in granulocyte by using low power Carbon dioxide laser radiation.

Selected Malaysian Wood CO2-Laser Cutting Parameters And Cut Quality

Laser has been used to cut most non-metallic materials very efficiently and successfully because these materials are highly absorptive by the CO2 laser wavelength of 10.6 10.6µm. Laser cutting process has been found to be reliable in loads of applications, with several advantages over other mechanical means in producing successful cut of even thermally sensitive materials such as wood. Various works which have been conducted to resolve the interaction between laser and wood but an ultimate guideline to produce the best cutting results are still undecided. This latest experiment was performed on Malaysian light hardwood namely, Nyatoh (Palaquium spp.), Kembang Semangkok (Scaphium spp.), Meranti (Shorea spp.) and normal Plywood using low power carbon dioxide laser machine with 500 Watt maximum output. The low power laser machine (Zech Laser model ZL 1010), equipped with a slow flow CO2 laser producing maximum output power of 500 watt on beam mode of TEM01 is employed. The processing variables taken into investigation were laser power, nozzlestandoff distance (SOD) or focal point position, nozzle size, assist gas pressure, types of assist gas, cutting speed and delay time. The wood properties observed were thickness, density and moisture content of the wood. The analyses considered were of the geometric and dimensional accuracy (straight sideline length, diameter of circle, kerf width, and percent over cut), material removal rate, and severity of burns of the matters upon machining with compressed air or any assist gases. The relationship between processing parameters and types of wood with different properties were outlined in terms of optimum cutting conditions, the minimum burnt-effect achievable and the best cut quality obtained with minimal surface deterioration and acceptable in accuracy. From this present study a guideline for cutting a wide range of Malaysian wood has been outlined.

Cold processing of green state LTCC with a CO2 laser

We report a novel “cold” self-cleaning technique for processing low temperature co-fired ceramic (LTCC) in the “green” state at high resolution and high speed, using a low power carbon dioxide laser. A particle ejection process involving both the ceramic grains and the organic binder produces material removal rates of >100 μm per pulse with lateral processing resolution of 50 μm and depth resolution comparable to ceramic grain size with no heat-effected zone or other deleterious thermal effects. The process has been used to drill microvias and to machine arbitrary shapes with high resolution.

Laser-assisted microsurgical anastomosis.

A low power carbon dioxide laser was used to perform 212 end-to-end laser-assisted microvascular anastomoses (LAMA) of femoral arteries (mean diameter, 1.2 mm) in Sprague-Dawley rats. Eighty-two conventional microvascular suture anastomoses (CMSA) utilizing 10-0 monofilament interrupted sutures were done for comparison of techniques and wound healing. The mean duration of each anastomosis procedure was 16 minutes for the LAMA repairs, compared to an average of 27 minutes for the CMSA repairs (P less than 0.05). All anastomoses were patent at the completion of the procedure. Each laser-assisted anastomosis required an average of seven intermittent laser exposures of 0.1 to 0.3 seconds each with approximately 80 mW of CO2 (wavelength = 10.6 micron) radiation at a spot size of 150 micron. A patency rate of 95% was obtained on the LAMA vessels (202 of 212) compared to 96% for the CMSA repairs (79 of 82). A total of 14 aneurysms were noted in the LAMA group (7%) compared to 11 in the CMSA (13%). All aneurysms were in patent vessels. Histological analysis indicates that the progression of wound healing of LAMA and CMSA anastomoses follows similar paths chronologically and morphologically with increased scar tissue formation around the suture. Scanning electron microscopy confirms the comparable luminal healing of the LAMA and CMSA vessels, with complete reendothelialization occurring by 3 weeks postoperatively. The tensile strength of the LAMA repair, although low immediately after operation, is comparable to that of the intact artery at 21 days. These findings suggest that a low energy carbon dioxide microsurgical laser has potential beneficial clinical application for anastomosis of small vessels.

Simple RF-excited CO2 laser

In the letter we describe the construction of a simple RF-excited low-power carbon dioxide laser built with ordinary materials. We achieved an output of 0.5 to 1 W and an efficiency of 5%.

Low power carbon dioxide laser induced chemistry of sulfur hexafluoride sensitized diborane

Low power carbon dioxide laser induced chemistry of sulfur hexafluoride sensitized diborane