Shape sensor system
The shape sensor system of the present invention contains a braided structure in which diameter bending members including two or more optical fibers, provided with detection target portions, are spirally wound around a center member as an axis in directions opposite to each other, or a semi permeable structure in which three or more modest diameter bending members including an optical fiber and a dummy optical fiber or a thin metal cable are a plurality of detection target portions are distributed in the direction around the axis of the center member, the bending instructions of the respective bending members have been synthesized to detect a bending shape of the probe part, a part of adjusting the fiber length at a braiding cycle is completed, and position deviation does not occur.
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1. Field of the Invention
The current invention relates to some shape detector system which is to be attached to a topic whose shape varies, and detects a condition of the topic.
2. Description of the Related Art
For a tubular insertion system using a flexible insertion portion known for endoscopes or so on, a shape sensor is integrated from the insertion portion to detect a changing shape of the insertion portion. As the shape sensor, for instance,Jpn. Pat. Appln. KOKAI Publication No. 2007-143600 reveals a shape detection probe using an optical fiber provided using a light modulation unit for a detection goal portion. In the shape detection breaker, the nitric oxide is assembled in order tobend integrally with the insertion portion of an endoscope. This optical fiber transmits light beams having different wavelength components. The light modulation unit modulates the intensity etc. of this wavelength part of the light beam to betransmitted. Based on the intensity etc. of this wavelength component before and following the modulation detected by the light modulation unit, the shape detecting probe detects the shape of the optical fiber in the place where the light modulation unit isdisposed, in other words, the shape of the endoscope bending together with the optical fiber.
PCT National Publication No. 2004-517331 proposes a structural case where a first fiber set spirally wound at one rotational direction and another fiber set spirally wound in the opposite rotational direction arebraided together.
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