Abstract: An ultrasound transducer includes: a drive unit including a piezoelectric device; a proximal end block; and a distal end block. The distal end block includes a first portion, a supported portion, a second portion, and a third portion. The distal end block is configured such that a position of a boundary between the second portion and the third portion corresponds to or substantially corresponds to an antinode of the ultrasonic vibration while the piezoelectric device generates the ultrasonic vibration, and the ultrasonic vibration is being propagated to the proximal end block, the first portion, the second portion, and the third portion. A resonance frequency of the ultrasonic vibration differs according to a position of the boundary between the second portion and the third portion under a condition that a distance from the supported portion to a distal end of the third portion along the longitudinal axis is constant.

Abstract: A vibration transmitter includes: a first rod including a fitting hole extending along the longitudinal axis thereof; and a second rod attached to a distal end portion of the first rod by a fitting portion fitted into the fitting hole in a state where a compressed surface pressure is received from the inner surface of fitting hole. The first rod includes: a first region in which the fitting portion is fitted into the fitting hole; and a second region positioned proximal of the first region. In the first region of the first rod, a crystal grain diameter is larger than that in the second region of the first rod.

Abstract: A vibration transmission member includes: a main body that extends from a front end toward a proximal end of the vibration transmission member to define a longitudinal axis direction and that has a proximal end to which an ultrasonic transducer configured to generate ultrasonic vibration is connected; and an end effector that is installed at a front end of the main body and that has a curved shape which curves in a first direction toward the front end of the vibration transmission member, the first direction being orthogonal to the longitudinal axis direction, the end effector being configured to apply the ultrasonic vibration to a body tissue to treat the body tissue.

Abstract: A vibration transmitter includes: a first rod including a fitting hole extending along the longitudinal axis thereof; and a second rod attached to a distal end portion of the first rod by a fitting portion fitted into the fitting hole in a state where a compressed surface pressure is received from the inner surface of fitting hole. The first rod includes: a first region in which the fitting portion is fitted into the fitting hole; and a second region positioned proximal of the first region. In the first region of the first rod, a crystal grain diameter is larger than that in the second region of the first rod.

Abstract: The ultrasonic transducer has a cylindrical shape having a first end surface and a second end surface, and includes a piezoelectric material that generates ultrasonic vibration for treating biological tissue with ultrasonic energy, a first electrode that is disposed in contact with the first end surface and to which an ultrasonic driving voltage is applied for generating ultrasonic vibration to the piezoelectric material, a second electrode that is disposed in contact with the second end surface and to which a reference voltage is applied for generating ultrasonic vibration to the piezoelectric material, an insulating plate that opposes the second end surface with the second electrode interposed therebetween, a third electrode that opposes the second electrode with the insulating plate and to which high-frequency power for treating biological tissue is supplied with high-frequency energy, and a short-circuit prevention unit that prevents short-circuiting between the first and third electrodes.

Abstract: A probe is connected to an ultrasonic transducer capable of generating ultrasonic vibration. The probe includes an elongated main body portion, and a cylindrical engagement portion. The main body portion is capable of transmitting the ultrasonic vibration. The ultrasonic vibration is input to the engagement portion. The engagement portion includes: a connection portion that is connected to the ultrasonic transducer, and a holding cylindrical portion that is continuous to the connection portion, and that holds the proximal end portion of the main body portion.

Abstract: Treatment device having vibration source, transmission rod, and detachable tip is equipped with ultrasonic transducers. Ultrasonic vibrations transmitted along the transmission rod to the detachable tip cause a treatment end of the tip, such as a blade, to vibrate at ultrasonic frequencies to cut and/or seal tissues. The detachable tip is connected at a location other than the vibration node or the antinode position. The detachable tip endures increased stresses associated with this location by decreasing the mass and sectional area relative to the increasing stress levels. The detachable tip connects to the transmission rod using a transmission surface and a biasing member, such as a leaf spring, that engages a detent located in the housing at the distal end of the transmission rod. Biased contact between the transmission surface and contact surface transmits both ultrasonic vibrations and high-frequency currents to the treatment edge of the detachable tip.

Abstract: A probe configured to be connected to a transducer unit configured to generate ultrasonic vibration, includes an elongated vibration transmission portion configured to transmit the ultrasonic vibration; and an engagement member provided on and/or near an outer circumference at a position which becomes a node of the ultrasonic vibration when the ultrasonic vibration is transmitted to the vibration transmission portion, the engagement member being formed by a material of an identical to or smaller damping rate than a damping rate of the ultrasonic vibration in the vibration transmission portion, and the engagement member being engaged with an exterior member disposed on an outer side of the vibration transmission portion.

Abstract: A vibration transmitter includes: a first rod including a fitting hole extending along the longitudinal axis thereof; and a second rod attached to a distal end portion of the first rod by a fitting portion fitted into the fitting hole in a state where a compressed surface pressure is received from the inner surface of fitting hole. The first rod includes: a first region in which the fitting portion is fitted into the fitting hole; and a second region positioned proximal of the first region. In the first region of the first rod, a crystal grain diameter is larger than that in the second region of the first rod.

Abstract: A probe is connected to an ultrasonic transducer configured to generate ultrasonic vibration. The probe includes an elongated main body portion, and a cylindrical engagement portion. The main body portion includes is configured to transmit the ultrasonic vibration. The ultrasonic vibration is input to the engagement portion. The engagement portion includes: a connection portion that is connected to the ultrasonic transducer, and a holding cylindrical portion that is continuous to the connection portion, and that holds the proximal end portion of the main body portion.

Abstract: An ultrasound transducer includes: a drive unit including a piezoelectric device; a proximal end block; and a distal end block. The distal end block includes a first portion, a supported portion, a second portion, and a third portion. The distal end block is configured such that a position of a boundary between the second portion and the third portion corresponds to or substantially corresponds to an antinode of the ultrasonic vibration while the piezoelectric device generates the ultrasonic vibration, and the ultrasonic vibration is being propagated to the proximal end block, the first portion, the second portion, and the third portion. A resonance frequency of the ultrasonic vibration differs according to a position of the boundary between the second portion and the third portion under a condition that a distance from the supported portion to a distal end of the third portion along the longitudinal axis is constant.

Abstract: A probe configured to be connected to a transducer unit configured to generate ultrasonic vibration, includes an elongated vibration transmission portion configured to transmit the ultrasonic vibration; and an engagement member provided on and/or near an outer circumference at a position which becomes a node of the ultrasonic vibration when the ultrasonic vibration is transmitted to the vibration transmission portion, the engagement member being formed by a material of an identical to or smaller damping rate than a damping rate of the ultrasonic vibration in the vibration transmission portion, and the engagement member being engaged with an exterior member disposed on an outer side of the vibration transmission portion.