An electrosurgical forceps includes first and second shafts configured to rotate about a pivot to move jaw members between an open position and a closed position. A knife deployment mechanism is operably coupled to a knife and is configured to move the knife between a retracted position and an extended position. A knife lockout is configured to move between a first position wherein the jaw members are in the open position and movement of the knife from the retracted position to the extended position is prevented, a second position wherein the jaw members are in the closed position and movement of the knife from the retracted position to the extended position is permitted, and a third position wherein the jaw members are in the closed position and movement of the knife from the retracted position to the extended position is prevented.

Various aspects of a generator, ultrasonic device, and method for estimating and controlling a state of an end effector of an ultrasonic device are disclosed. The ultrasonic device includes an electromechanical ultrasonic system defined by a predetermined resonant frequency, including an ultrasonic transducer coupled to an ultrasonic blade. A control circuit measures a complex impedance of an ultrasonic transducer, wherein the complex impedance as defined as

[00001]$Z_g\left(t\right)=\frac{V_g\left(t\right)}{I_g\left(t\right)};$

The control circuit receives a complex impedance measurement data point and compares the complex impedance measurement data point to a data point in a reference complex impedance characteristic pattern. The control circuit then classifies the complex impedance measurement data point based on a result of the comparison analysis and assigns a state or condition of the end effector based on the result of the comparison analysis. The control circuit estimates the state of the end effector of the ultrasonic device and controls the state of the end effector of the ultrasonic device based on the estimated state.

An electrosurgical instrument is provided that captures, compresses, fuses and cuts tissue between upper and lower jaws connected to pivotably movable handles. The instrument includes a force and over compression regulation mechanism that is configured such that in a clamped configuration, the jaws delivers a gripping force between the first jaw and the second jaw between a predetermined minimum force and a predetermined maximum force.

An end effector assembly for use with a forceps includes a pair of jaw members, a knife assembly, and one or more cam assemblies. One or more of the jaw members are moveable relative to the other about a pivot between open and closed positions. One or more of the jaw members include a knife channel. The pivot includes first and second sections defining a passage therebetween. The knife assembly includes a knife blade and an actuation shaft. The knife blade is disposed distally relative to the pivot. The actuation shaft is configured for slidable translation through the passage to allow selective advancement of the knife blade through the knife channel. The one or more cam assemblies are operably coupled to the one or more moveable jaw members and are actuatable to move the one or more jaw members between the open and closed positions for grasping tissue therebetween.

An instrument may comprise a shaft and an end effector comprising a jaw mechanism coupled to the shaft. The jaw mechanism may comprise a first jaw member and a second jaw member movable relative to one another by pivoting about a pivot axis between an open configuration of the jaw mechanism and a closed configuration of the jaw mechanism. The second jaw member may be rotatable about a roll axis of the second jaw member between at least two orientations, the roll axis of the second jaw member being transverse to the pivot axis. In a first orientation of the at least two orientations, the jaw mechanism is configured to perform a first function. In a second orientation of the at least two orientations, the jaw mechanism is configured to perform a second function differing from the first function.

An electrosurgical instrument (1) includes a first shaft member (110) pivotably coupled to a second shaft member (120), and a trigger (184) disposed on the second shaft member (120). The first and second shaft members (110,120) respectively include first and second handle members (130,140), and first and second jaw members (150,160). The first and second shaft members (110,120) define a longitudinal axis extending through a pivot, and first and second pivot axes that are substantially orthogonal to each other and the longitudinal axis. At least one of the first or second handle members (130,140) is pivotable about the first pivot axis to move the first and second jaw members (150,160) to an open position, a grasping position, or a sealing position. The trigger (184) is movable to pivot at least one of the first or second shaft members (110,120) about the second pivot axis to laterally displace the first and second jaw members (150,160) relative to each other to a cutting position.

A left atrial appendage (LAA) occluder and an occluding system are provided. The LAA occluder includes a sealing portion and an ablation portion arranged in the sealing portion, as well as a hollow proximal connector at a proximal end of the sealing portion. The ablation portion is connected to the proximal connector. The ablation portion is used to freeze an LAA after being injected with cryogen so as to form an annular isolation band on an inner wall of the LAA for blocking the conduction of electrical signals between the LAA and a left atrium.

A surgical system includes a housing, an ultrasonic transducer supported by the housing, an end effector assembly distally-spaced from the housing, a clamp lever, and a sensor. The end effector assembly includes an ultrasonic blade operably coupled to the ultrasonic transducer for receiving ultrasonic energy produced by the ultrasonic transducer, and a jaw member pivotable relative to the blade from an open position towards a clamping position for clamping tissue between the jaw member and the blade and imparting a clamping force to the clamped tissue. The clamp lever is operably coupled to the housing and the jaw member such that actuation of the clamp lever relative to the housing pivots the jaw member towards the blade. The sensor is configured to sense whether the clamp lever is sufficiently actuated so as to impart the clamping force to the clamped tissue.

A universal motor cartridge for a surgical instrument includes a reusable housing having a distal face and a bottom surface and configured to securely engage a disposable surgical instrument. Couplers disposed on the distal face are adapted to engage couplers disposed on the surgical instrument upon engagement of the housing. A plurality of electrical interfaces on the bottom surface are adapted to electrically engage corresponding electrical interfaces on the surgical instrument, such that, upon activation of each switch disposed on the surgical instrument, the corresponding electrical interface on the surgical instrument communicates with the corresponding electrical interface on the bottom surface of the housing, which, in turn, actuates the corresponding coupler to engage and actuate the respective coupler on the surgical instrument causing the surgical instrument to rotate/articulate a shaft, open/close a pair of jaw members, deform staples, move a knife or energize an end effector.

A vessel sealing instrument includes a housing having a shaft extending from a distal end thereof including an end effector assembly having opposing first and second jaw members operably coupled thereto. One of the jaw members moveable between open and closed positions for clamping tissue with a closure pressure within the range of about 3 kg/cm.sup.2 to about 16 kg/cm.sup.2. The jaw members are adapted to connect to a generator for providing energy thereto in accordance with a sealing algorithm. An anti-backdrive mechanism is associated with the end effector assembly and includes: a drive shaft coupled to a controller and a screw on opposite ends, the screw configured to engage one of the jaw members upon extension thereof to provide additional closure pressure therebetween. The drive shaft is rotatable by the controller to extend the screw in response to tissue expansion during sealing based on the sealing algorithm.