Abstract: A surgical treatment of a shoulder joint, includes inserting an arthroscope and an ultrasonic device into the shoulder joint, and removing a bursa and removing a bone spur present under an acromion in a state seen with the arthroscope by use of the ultrasonic device which ultrasonically vibrates.

Abstract: A surgical treatment of an ACL or a PCL of a knee joint under an arthroscope, includes: contacting a treating portion of an ultrasonic device with a start region to which the ACL or the PCL of a femur adheres, and excising the femur and a remaining ligament of the ACL, or the femur and a remaining ligament of the PCL by ultrasonically vibrating the treating portion, thereby exposing a footprint of the femur; and contacting the treating portion with an end region to which the ACL or the PCL of a tibia adheres, and excising the tibia and a remaining ligament of the ACL, or the tibia and a remaining ligament of the PCL by ultrasonically vibrating the treating portion, thereby exposing a footprint of the tibia.

Abstract: A joint surgical treatment under an arthroscope, includes: excising a treatment object of a synovial membrane, by transmitting an ultrasonic vibration to a treating portion of an ultrasonic device in a state where the treating portion is in contact with the treatment object of the synovial membrane; facing the treating portion to a treatment object of a cartilage, the treating portion being used in excising the treatment object of the synovial membrane; and removing the treatment object of the cartilage, by contacting the treating portion with the treatment object of the cartilage, and by transmitting the ultrasonic vibration to the treating portion in a state where the treating portion is in contact with the treatment object of the cartilage.

Abstract: A probe which is configured to treat a bone by ultrasonic vibration, includes: a treatment section which is arranged on a distal end side of a vibration transmitting section, to which the ultrasonic vibration is transmitted through the vibration transmitting section. The treatment section includes: a cutting blade that includes a treatment surface, and cuts and treats the bone by the treatment surface; a protrusion that is provided at a position different from the cutting blade, protrudes in a direction different from the protruding direction of the treatment surface of the cutting blade, marks the bone, and defines a position of the bone to be treated with the cutting blade; and a regulation surface that is formed at a position where the protrusion is provided, and regulates entrance of the protrusion into the bone beyond a predetermined level.

Abstract: A contact portion, provided in an exposed surface of the treating section, treats a treated object by a transmitted ultrasonic vibration while intruding into the treated object toward an intruding direction from a state being in contact with the treated object. An index portion is disposed on an anti-intruding direction side with respect to the contact portion in the exposed surface. The index portion becomes an index indicating an intruding amount of the contact portion into the treated object toward the intruding direction. The index portion includes index surfaces arranged in the intruding direction, and each of the index surfaces has an angle relative to the intruding direction which is different from the angle of the adjacent index surface.

Abstract: A probe unit includes, a probe configured to treat a bone by ultrasonic vibration, a hollow sheath which surrounds the probe and which has a first portion at a small distance from a central axis, and a second portion at a greater distance from the central axis than the first portion, and a knob configured to rotate the sheath relative to the probe between a first position for insertion between the bone and a living tissue facing the bone so that the first portion is located between the bone and the living tissue and a second position for insertion between the bone and the living tissue so that the second portion is located between the bone and the living tissue.

Abstract: A probe which is configured to treat a bone by ultrasonic vibration, includes: a treatment section which is arranged on a distal end side of a vibration transmitting section, to which the ultrasonic vibration is transmitted through the vibration transmitting section. The treatment section includes: a cutting blade that includes a treatment surface, and cuts and treats the bone by the treatment surface; a protrusion that is provided at a position different from the cutting blade, protrudes in a direction different from the protruding direction of the treatment surface of the cutting blade, marks the bone, and defines a position of the bone to be treated with the cutting blade; and a regulation surface that is formed at a position where the protrusion is provided, and regulates entrance of the protrusion into the bone beyond a predetermined level.

Abstract: A treatment device for use in treating a biological tissue, includes: a holding portion, an ultrasonic transducer unit, a probe, an inner sheath, a first sealing member, an outer sheath that covers an outer peripheral surface of the inner sheath, a second sealing member, and an actuator that moves the ultrasonic transducer unit, the probe and the inner sheath integrally to the outer sheath along the longitudinal axis.