A rigidity variable device includes: a main body unit having an elongated shape; a plurality of higher rigidity portions made of metal, the higher rigidity portions being included in the main body unit and arrayed in a separated manner in a direction along a longitudinal axis of the main body unit; and one or a plurality of lower rigidity portions included in the main body unit and including a shape memory alloy coil disposed between adjacent ones of the higher rigidity portions and formed by winding a wire around an axis parallel to the longitudinal axis. A rigidity of the shape memory alloy coil increases when heated.

A rigidity variable device includes: an elongated main body unit; a plurality of metal high-rigidity portions arranged with gaps along an longitudinal axis of the main body unit in the main body unit, the plurality of high-rigidity portions being made of metal; and a low-rigidity portion including a plurality of shape-memory alloy wires that intervene between high-rigidity portions adjacent to each other among the high-rigidity portions, and are apart in a direction orthogonal to the longitudinal axis in the main body unit.

An endoscope system includes: an endoscope equipped with an insertion portion inserted into a subject; a heating element provided in the insertion portion and configured to generate heat; a temperature sensor configured to acquire heating element temperature data on temperature of the heating element; and a processor. The processor outputs initial surface temperature, which is data on insertion portion surface temperature at a first time point prior to a heating start time of the heating element, based on the heating element temperature data at the first time point and estimates changes in the insertion portion surface temperature over time after the first time point based on the heating element temperature data after the first time point using the initial surface temperature as an initial value of the insertion portion surface temperature.

A rigidity control apparatus includes a processor and controls a variable-rigidity apparatus. The variable-rigidity apparatus includes a variable-rigidity member, flexural rigidity of which increases when the variable-rigidity member is heated, and a heater configured to be able to heat the variable-rigidity member. The processor calculates information about temperature of the heater, and estimates information about temperature of the variable-rigidity member based on the information about the temperature of the heater.

A method includes transmitting an instruction to a motive power supply of an elastically deformable device to drive the elastically deformable device in accordance with a drive setting; measuring a force exerted on the elastically deformable device with a sensor; outputting an observed value representative of the force; comparing the observed value with a reference value corresponding with a predetermined force to be exerted on the elastically deformable device; and adjusting the drive setting based on a determination that the observed value is outside of a predetermined range of the reference value. The method prevents slack in the elastically deformable device over time. Related apparatuses, systems, techniques and articles are also described.

An insertion system includes an insertion section and a rigidity variable portion provided in the insertion section. The rigidity variable portion includes a superelastic alloy member whose rigidity starts changing from a high-rigidity state to a low-rigidity state at a temperature, which varies with a degree of bending of the superelastic alloy member, and a heating member capable of switching between presence and absence of heating of the superelastic alloy member. The insertion system also includes a bending state detection sensor that detects a bending state of the rigidity variable portion, and a rigidity variable controller that controls switching between presence and absence of heating of the superelastic alloy member by the heating member to control the temperature of the superelastic alloy member.

A system for advancing an instrument along an arbitrary path includes a flexible and steerable instrument and an electronic memory configured to store a three-dimensional model of the path, the three-dimension model being generated based on signals from the instrument as it traverses along the path. The system further includes an electronic motion controller logically coupled to the electronic memory, wherein the electronic motion controller is configured to automatically control the instrument to traverse the path based on the three dimensional model.

A flexible tube insertion apparatus includes: a flexible tube; a stiffness control system configured to control a stiffness of the tube; a buckling detection system configured to detect occurrence of a buckling in the tube; a pulling operation detection system configured to detect that a pulling operation of the tube is performed, after detection of the occurrence of the buckling; and a storage configured to store position information of a stiffness-to-be-enhanced portion of the tube neighboring a buckling portion of the tube and located on a distal side of the buckling portion. The stiffness control system is configured to enhance a stiffness of the stiffness-to-be-enhanced portion, based on the position information, at detection of the pulling operation.

An embodiment of the present invention provides for an elongated medical device with a hypotube backbone running through the device, and a spiral lumen spiraled around the backbone along the length of the backbone. The backbone may be formed from a nitinol alloy for increased bendability without compromising axial stiffness. The device may also incorporate a jacket around the hypotube and spiral lumen formed using either melting, molding, bonding, or casting. The spiral lumen may be configured to accommodate a variety of uses, including actuation members (e.g., pull wires), tools, and means for aspiration, irrigation, image capture, and illumination. Additionally, the present invention provides a method for constructing an elongated medical device with a hypotube backbone running through the device, and a spiral lumen spiraled around the backbone along the length of the backbone.

Provided is a control apparatus for a continuum robot system includes: a continuum robot (1), which includes a plurality of curvable portions (111, 112) provided in series in a longitudinal axial direction thereof and each being curvable, and is capable of being moved in the longitudinal axial direction; a drive unit (2) configured to move the continuum robot (1) in the longitudinal axial direction; and a plurality of angle control motors (211, 212) configured to change a distal-end angle (.sub.1, .sub.2) for each of the plurality of curvable portions (111, 112). The control apparatus includes a drive unit speed calculation/control unit (44) configured to calculate a followable speed, and to control the drive unit (2). The drive unit speed calculation/control unit (44) controls the drive unit (2) to move the continuum robot at a speed equal to or lower than the followable speed.