We used two kinds of implant materials, clinical bone screw for control, titanium alloy dual locking screw. These samples were implanted into wood. Torsional and bending strength between the implant materials and wood was measured by torsion and bending tests with an Instron-type universal testing machine. There were no differences in torsional strength of bone screw and dual locking screw at rotation angle ±10°. Torsional strength was greatest in bone cement reinforced bone screw compared with other groups, but there was no significant difference between apatite cement reinforced bone screw and bone screw at rotation angle ±15°. The mean ultimate bending load of the Type S(bone screw)was(5.4±0.36 kN), Type D(dual locking screw)(3.8±0.23 kN), Type S(A)(bone screw with apatite cement)(1.2±0.4 kN)and that of the Type S(B)(bone screw with bone cement)(2.5±0.7 kN). In torsional test, the effect of the apatite and bone cement was positive, and in bending test, it was negative.

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In this study, we developed a telemonitoring system of water supplier to estimation of water intake for health care. This system consists of a automatic water supply measurement system and a remote monitoring system. The automatic water supply measurement system has a thermos bottle, a electric balance and a computer. Subject can drink water from the thermos bottle using his/her cup/glass that subject is used to in daily life. The remote monitoring system consists of a computer and WWW browser. Neither new device nor special procedure is not required for monitoring. We estimated water intake of an elderly diabetic inpatient for three days by using this system. The automatic water supply measurement system set up at a position where the subject could reach it from the bed, because the subject needed assistance for walking. Data was monitored from nurse's station . We obtained the tendency that the volume of water supply increase after awaking and meals. Our results suggested that this system easily provide information of water intake pattern. Moreover, this system was easy to use for both of subject and observers. There is a possibility that this system will not only save nursing time, but also improve clinical care.

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Checking the fit between a prosthetic socket and a residual limb is important for functional prostheses. Designing a prosthetic socket using a CAD system and checking the above mentioned fit by analyzing the deformation and stress under the weight of an amputee requires a three-dimensional model of the residual limb that includes not only the surface, but also the fat, muscle and bone. An ultrasonic measurement system, including a probe that three-dimensionally measures the external surface shape and the shapes of internal tissues simultaneously was developed. The system uses wavelet analysis to define the positions of the boundaries between each tissue. A cone-shaped aluminum test object was measured using the system, which was shown to be capable of measuring radius with an error of 0.6mm and slope with an error of 6%. In addition, the lower legs were measured, and the surface, muscles and bone boundaries were defined by wavelet analysis. The results of these measurements were compared to MRI cross sectional data, and the average error for the leg surface, muscles and tibia were 1.7mm, 2.4mm and 1.9mm, respectively, for boundaries that were determined correctly.

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