Cirujano De Pie Y Tobillo

Challenges for Assistive Technology G. Eizmendi et al. (Eds.) IOS Press, 2007 © 2007 The authors and IOS Press. All rights reserved.

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The Measurement Technique of AFO(ankle-foot orthosis) Fitting for More Comfortable
Yasushi MATSUDAa,1, Tomohiko HORIGUCHIb, Akiyoshi SAITOUb, Shoichiro FUJISAWAa and Osamu SUEDAa a The University of Tokushima b KAWAMURA Gishi Co,.Ltd
Abstract. Anankle-foot orthosis (AFO) for the physically disabled is constructed of one or two pieces, but the human leg ,below the knee level, is composed of over 26 bones. As a result, the present AFO shape doesn't match human leg's action. An AFO is usually used for the patients standing on tiptoe or to support their foot. A one-piece AFO foot part accomplishes this purpose. However, a human being walksalternately right and left feet. Many bones are required to transfer our weight smoothly between right and left foot. A foot part of one-piece AFO can not reproduce the movement of a soft human foot. This is the reason current AFOs do not conform to those movement of patients. AFOs which do not reproduce the movement accurately, even if they match the shape of the patients, not only inhibit naturalwalking, but also disturb normal daily activities ((ADL)). Furthermore, using unsuitable AFOs for long periods of time might harden paralyzed limbs. For better rehabilitation, it is necessary that AFOs has to be proper shape statically but also dynamically that reproduce natural walking movement. To research and develop better orthopedic braces, we measured the action of human legs in AFO devices andwalking using sensors and video analysis. A sensor can measure force in the vertical direction (pressure) and force in the horizontal direction (shear). The analysis of AFO becomes possible with this sensor. Video measurements can be used to evaluate human walking by recording the position of each joint and movement of the center of gravity. These measurements can evaluate an objective by numericalanalysis rather than just the conventional subjective evaluation of walking. Keywords. Orthosis , Dynamic force-sensors , Movement analysis

Introduction When the persons take damage of a cerebral blood vessel and fluid in the brain and a brain cortex, and it influences of illness and a wound of the spinal column, and instructions form a brain do not reach limbs, it is with the paralysis and afunctional motility disorder of a sense and perception without sensory nerve and instructions system of motor nerves working precisely and causes a delay in everyday life. A brain and the paralysis by an obstacle of the spinal column perform rehabilitation after medical treatment now. After treatment, the persons aim at acquiring of the recovery and compensation movement, but we call the case thatwas not able to recover in an original condition in body chronically with “Disabled”.
1

e-mail: matsuda@eco.tokushima-u.ac.jp

+81-72-875-8047

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Y. Matsuda et al. / The Measurement Technique of AFO Fitting for More Comfortable

The disabled person use AFO(ankle-foot orthosis[1])for support to walk. Now it is made with one part or two parts connected to an axis made from amachine-element. Two parts have a calf part from a foot part. Ordinary Ankle-foot orthosis is shown in figure 1.

Figure 1. Ordinary ankle-foot orthosis

Figure 2.

Human legs skeleton

With a paralysis, extending a foot part becomes strong and the foot part does not Get nervous with the tip of a foot having fallen down. A support to put up the tip of a foot while a foot leaves the ground atwalking is necessary. In this purpose, the case to wear AFO is common. For other purposes, AFOs help stability of a foot part at intervals where a foot reaches the ground. Leaning back became strong a foot by a kind of the paralysis and objective AFO to immobilize is added [2]. As for the judgment, AFOs meet physical shape and athletic capability, a step and walk speed, comparison of a video picture...