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Background: As the most abundant protein in human tissues, the use of collagen is essential in the fields of biological science and medicine.Objective: The aim of this study is to investigate the mechanical effect of pulsed laser irradiation on collagen tissue.Methods: With various laser parameters such as peak power, pulse width, and repetition rate, the induced stresses on samples were measured and analyzed. Monte Carlo simulation was performed to investigate the effect of laser parameters on the collagen sample.Results: The results indicated that the magnitude of mechanical stress could be controlled by various laser parameters.Conclusions: This study can be used in biostimulation for therapy and mechanoreceptor stimulation for tactile application. [ABSTRACT FROM AUTHOR]

Background: The evaluation and control of lighting is crucial in physiological, biomedical, and industrial fields. Many kinds of lighting techniques based on LED have been developed due to its advantages.Objective: The aim of this study is to develop the multi-colored LED system for healing purposes.Methods: Light source with three-color chip LEDs was investigated to detect the dominant wavelength.Results: The results show that the additive principle by three-color LEDs can be successfully applied to lighting system by generating a variety of colors.Conclusions: The results are expected to be useful in the field of light therapy and medicine. Applications of the developed light system are lighting therapies such as stimulating blood circulation and digestive processes, and controlling inflammation. [ABSTRACT FROM AUTHOR]

Background: Evaluation of joint movements is essential to choose an appropriate rehabilitation protocol for a patient.Objective: The aim of this study is to suggest an alternative optical technique for measurement of joint angle which is convenient, inexpensive, and can be operated in real time.Methods: According to the principle of the triangulation method, position sensitive detector (PSD) converts reflected light signals into distance-related voltages. Various parameters were investigated to increase detection range and resolution of joint angle measurements.Results: The accuracy of the suggested optical sensor was verified by comparing with a commercial goniometer and 3D motion capture system.Conclusions: This method can be applied to monitor recovery progress for the patient in rehabilitation and sport science. [ABSTRACT FROM AUTHOR]

For diagnostic and therapeutic purposes, the joint angle measurement of a patient after an accident or a surgical operation is significant for monitoring and evaluating the recovering process. This paper proposed an optical fiber sensor for the measurement of angular displacement. The effect of beveled fiber angle on the detected light signal was investigated to find an appropriate mathematical model. Beveled fiber tips redirected the light over a range of angles away from the fiber axis. Inverse polynomial models were applied to directly obtain and display the joint angle change in real time with the Lab-VIEW program. The actual joint angle correlated well with the calculated LabVIEW output angle over the test range. The proposed optical sensor is simple, cost effective, small in size, and can evaluate the joint angle in real time. This method is expected to be useful in the field of rehabilitation and sport science. [ABSTRACT FROM AUTHOR]