Kabushiki Kaisha B.i. Tec

Hitachi, Ltd.

Thk Co., Ltd.

Mamoru Mitsuishi

Mitsuishi, Mamoru

Nobuhiko Sugano

Kazuo Yonenobu

Ichiro Sakuma

Yasuyuki Momoi

Takeyoshi Dohi

Shinichi Warisawa

Toji Nakazawa

Kojima Kisanuki

Yoshinobu Sato

Takahiro Ochi

Tatsuya Ishizuka

Toshihiko Sasama

Yoshikazu Nakajima

Madoka Sugiura

Masaru Zako

Sunichi Bandoh

Toji c/o Thk Co Ltd Nakazawa

A custom-made stem has a shape displaying good fit and fill, reflecting personal characteristics of a femur obtained by computer calculation. A model is made from the femur which does not need much time to calculate in spite of the fact that it complies with the characteristic of shape of the femur, particularly with the personal difference in the curvature thereof, which usually complicates the calculation. Several models are made which can be implanted in a deep hollow by calculating in a reverse course how the stem is pulled out of the deep hollow, to display reliable models to a surgeon. By determining the movement peculiar to the stem of a particular patient, an improved stem is made in a short time which meets the needs of the surgeon. The stem, which is custom-made, can be confirmed beforehand that it agrees with the femur of the patient.

Method of determining shape of artificial cementless hip prosthesis stem

An artificial cement-less hip prosthesis stem comprises an inner constructwhich reacts with a load acting on a hip joint and an outer constructfor transmitting the load acting on the inner construct to a femur. The inner construct has an inner bodyB which reacts with the load transmitted from a neckA. The outer construct has both an outer bodyA which is bell mouth-shaped toward an epiphysis so as to surround the inner bodyB and a legB extending toward a medullary cavity. The torsional rigidity given to the proximal end and the distal end of the outer bodyA and the legB is regulated so as to be lower than the torsional rigidity given to an intermediate portionof the outer bodyA.

Artificial cementless hip prosthesis stem

A position measuring apparatus, for use in an assisting apparatus for surgical opertions, includes a position indicating apparatus for indicating a position and a direction of a tool, and three-dimensional position measuring apparatus for measuring a position and a direction of a surgical field and also the position and the direction of the tool. The position indicating apparatus and the three dimensional position measuring apparatus are unified in one body in the relative position thereof, so that a position for assistance of surgical operation is indicated in the form of an intersection line or an intersection point of the laser beams, irrespective of the position of the position measuring apparatus.

Position measuring apparatus

Tow forces can be measured only by providing one force sensor in a device structure, and a drive system is driven so as to assist an external force by detecting it. A value at a force sensor () at the moment when a foot switch () is set as the original point (detection reference) of a force to be assisted. Variations of the force after the original point setting is measured by the force sensor () the difference between the measured value and the assist original point is obtained, and a force to be assisted is detected. Depending on the magnitude of the force to be assisted, assist operation is performed by causing a drive force to act on a foot such that the force to be assisted is reduced. When the force is assisted reaches zero, the assist operation is completed. Then, two forces, or 'a force acting on a patient's foot' and 'a force applied to the foot' from the outside, are detected by the one force sensor ().

Power assistance controlling apparatus, power assistance controlling method, and physiotherapy apparatus

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Suita, Japan

Nobuhiko Sugano