Development of Computer Assisted Orthosis Design and Manufacturing System for Malformed Ears

Hanafusa, Akihiko; Takahashi, Hajime; Akagi, Kohji; Isomura, Takuya

doi:10.3109/10929089709148117

Cited by 4 publications

(3 citation statements)

References 7 publications

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“…This method is based on the Iterative Closest Point (ICP) algorithm [5], with improvements to permit handling of both three-dimensional and RGB color co-ordinate distance. Equation (2) shows the defined united distance (d) of three dimensional distance and color distance. Here, a P…”

Section: Composure Of the Auricular Three-dimensional Modelmentioning

confidence: 99%

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Orthosis Design System for Malformed Ears Based on Spline Approximation

Hanafusa

Isomura

Sekiguchi

et al. 2002

Medical Image Computing and Computer-Assisted Intervention — MICCAI 2002

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Malformed ears of neonates can be effectively treated by employing an orthosis of suitable shape. Currently, we use orthoses made of nitinol shape memory alloy wire and have developed a computer-assisted design system to manufacture the orthosis. Using this method, extracted contours of the helix and auriculotemporal sulcus are approximated to spline, and orthosis shape can be designed by moving the control points of spline with reference to control points of the target auricular shape. The system also functions to evaluate the contact force between the orthosis and auricle. Using this system, orthoses were designed and manufactured for 16 patients with malformed ears. Treatment was more effective in cases where it was necessary to extend the helix.

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Section: Composure Of the Auricular Three-dimensional Modelmentioning

confidence: 99%

“…An iron plate is grooved by the shape of the orthosis and the wire is inserted to fix the shape. We have recently developed a computer-assisted design system [2] for use in constructing the orthosis. Previously, there have been only limited attempts to employ such a system for this purpose.…”

Section: Introductionmentioning

confidence: 99%

Orthosis Design System for Malformed Ears Based on Spline Approximation

Hanafusa

Isomura

Sekiguchi

et al. 2002

Medical Image Computing and Computer-Assisted Intervention — MICCAI 2002

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“…Examples of both a straight orthosis mounted on cryptotia and a curved orthosis mounted on a folded helix are shown in Fig.1. We have recently developed a computer-assisted design system [2] for use in constructing the orthosis.…”

Section: Introductionmentioning

confidence: 99%

Contact Force Evaluation of Orthoses for the Treatment of Malformed Ears

Hanafusa

Isomura

Sekiguchi

et al. 2002

Medical Image Computing and Computer-Assisted Intervention — MICCAI 2002

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Abstract. In most cases, malformed ears of neonates can be effectively treated by fitting a suitably shaped orthosis. In this study, a finite element analysis system was developed to evaluate the contact force between the orthosis and auricle. In order to reduce the contact force, two methods for modifying orthosis shape were developed. One entailed the addition of a detour curve, while the other canceled out the insertion of the nodal point where maximum force exceeded the limit during the incremental step of finite element analysis. Moreover, two small sensors were developed, one using a silicon tube and the other a strain gauge, for mounting on the orthosis and measuring contact force. Straight, curved and maximum force-restricted orthoses were manufactured for an adult auricle. Simulation and insertion experiments using silicon tube and strain gauge sensors were performed. Results demonstrated that the strength of contact force between the orthosis and auricle decreased from straight type, through curved type to the maximum force-restricted type.

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