A tissue-removing catheter for removing tissue from a body lumen during a cutting operation includes an elongate catheter body configured for insertion into the body lumen and a tissue-removing element. A motor is operably connected to the tissue-removing element for rotating the tissue-removing element. A sensor is configured to detect a parameter of the catheter body during the cutting operation. A motor control circuit is in electrical communication with the sensor and the motor. During an operational control function, the motor control circuit is configured to receive a signal from the sensor based at least in part on the detected parameter, determine whether the received signal is indicative of inefficient movement of the tissue-removing element, and adjust a rotational speed of the tissue-removing element to increase efficiency of the tissue-removing element if the received signal is indicative of inefficient movement of the tissue-removing element.

A system includes a focus optic configured to converge an electromagnetic radiation (EMR) beam to a focal region located along an optical axis. The system also includes a detector configured to detect a signal radiation emanating from a predetermined location along the optical axis. The system additionally includes a controller configured to adjust a parameter of the EMR beam based in part on the signal radiation detected by the detector. The system also includes a window located a predetermined depth away from the focal region, between the focal region and the focus optic along the optical axis, wherein the window is configured to make contact with a surface of a tissue.

A surgical instrument comprising a shaft, an end effector, and an articulation joint rotatably connecting the end effector to the shaft is disclosed. The end effector and/or shaft comprise indicator lights which indicate the direction in which the end effector is being articulated. The indicator lights are positioned such that they are visible to a clinician via an endoscope monitor during an endoscopic procedure.

Reperfusion injury is limited during endovascular therapies (e.g., revascularization and/or reperfusion of end organ tissues) by conditioning the tissues against reperfusion injury using an optical fiber catheter to deliver far red and near infrared (R/NIR) light to the tissues. The light may be multiple wavelength or single wavelength light, and may have one or more wavelengths selected from the range of 510 to 830 nm. The R/NIR light may be delivered concurrently with the endovascular therapy, or in other instances may be delivered before or after a particular therapy.

A tissue-removing catheter for removing tissue in a body lumen includes an elongate body having an axis and proximal and distal end portions spaced apart from one another along the axis. A tissue-removing element is mounted on the distal end portion of the elongate body. The tissue-removing element is configured to remove the tissue as the tissue-removing element is rotated by the elongate body within the body lumen. A motor operatively engages the elongate body for driving rotation of the elongate body and tissue-removing element mounted on the elongate body. A controller is operatively connected to the motor and configured to perform a torque response routine to control a speed of the motor based on a set PWM value of the motor and a detected current applied to the motor during rotation of the elongate body and tissue-removing element.

A catheter assembly includes a catheter comprising a flexible elongated member including a distal portion that includes a tubular body defining an inner lumen and a plurality of body apertures that extend through a sidewall of the tubular body into the inner lumen, and a plurality of primary electrodes positioned along the tubular body. The catheter assembly includes a wire defining at least one secondary electrode, the wire being configured to be slidably moved through the inner lumen of the tubular body, where the wire and the plurality of primary electrodes are configured to electrically couple to an energy source that delivers an electrical pulse to a fluid in contact with the plurality of primary electrodes and the at least one secondary electrode to cause the fluid to undergo cavitation to generate a pressure pulse wave within the fluid.

A surgical instrument comprising a handle, a shaft rotatable relative to the handle, and an end effector articulatable relative to the shaft about an articulation joint is disclosed. The shaft comprises a grip and at least one articulation control on the grip.

The present disclosure is directed to an electrosurgical generator including a resonant inverter having an H-bridge and a tank. A sensor array measures at least one property of the tank. A pulse width modulation (PWM) controller outputs a first PWM timing signal and a second PWM timing signal to the H-bridge. The PWM controller controls a dead-time between the first PWM timing signal and the second PWM timing signal based on the at least one property measured by the sensor array.

An ultrasonic surgical instrument and method for identifying tissue state and energizing the surgical instrument includes an end effector having an ultrasonic blade and an RF electrode, a shaft assembly, a body, and a power controller. A first ultrasonic energy input is configured to be actuated from a first unactuated energy input state to a first actuated energy input state. A trigger input is configured to be actuated from an unactuated trigger input state to an actuated trigger input state. The power controller is operatively connected to the ultrasonic blade, the RF electrode, the first ultrasonic energy input, and the trigger input and configured to direct at least one of the ultrasonic blade or the RF electrode to be selectively driven according to a predetermined drive function based on the tissue impedance, the state of the first energy input, and the state of the trigger input.

An electrosurgical system for treating biological tissue that comprises: an electrosurgical generator to supply microwave energy; a surgical scoping device having a steerable insertion cord for insertion to a treatment site; and an electrosurgical instrument dimensioned to fit within an instrument channel that is located within the insertion cord. The electrosurgical instrument comprises: a flexible coaxial cable arranged to convey the microwave energy; and a radiating tip portion connected at an end of the coaxial cable and configured to receive microwave energy. The radiating tip portion comprises: a coaxial transmission line for conveying the microwave energy; and a needle tip mounted at an end of the proximal coaxial transmission line, wherein the electrosurgical instrument is slidable within the instrument channel to extend the needle tip beyond an end of the instrument channel to puncture biological tissue; the needle tip is arranged to deliver the microwave energy into biological tissue.