A control circuit of a surgical device is disclosed. The control circuit includes a first circuit portion coupled to at least one switch operable between an open state and a closed state. The first circuit portion communicates with a surgical generator over a conductor pair to receive a control signal to determine a state of the at least one switch.

Surgical generator for ultrasonic and electrosurgical devices

A surgical instrument. The surgical instrument may comprise a transducer and an end effector. The transducer may be configured to provide vibrations along a longitudinal axis at a predetermined frequency and may comprise a piezoelectric stack positioned along the longitudinal axis. The transducer also may comprise a first metallic end mass positioned along the longitudinal axis adjacent a first end of the piezoelectric stack and a second metallic end mass positioned along the longitudinal axis adjacent a second end of the piezoelectric stack. The length of the transducer may be greater than or equal to of one wavelength and less than ½ of one wavelength. The end effector may be coupled to the transducer and may extend along the longitudinal axis. The length of the transducer and the end effector may be a multiple of ½ of one wavelength.

Ultrasonic surgical instruments

A surgical instrument for supplying energy to tissue may comprise a handle, a trigger, an electrical input, and a shaft extending from the handle. The surgical instrument may comprise and end effector first and second tissue engaging surfaces that are slanted with respect to a transection plane. The end effector may, for example, have an electrode defining a V-shaped cross sectional profile. The end effector may comprise a plurality of raised surfaces that are received by a plurality of indentions when the end effector is in the closed position. The end effector may comprise a cutting member having a plurality of bands. A surgical instrument for supplying energy to tissue may comprise a handle, a trigger, an electrical input, and a shaft extending from the handle. The surgical instrument may comprise an end effector. The end effector may comprise a cammed compression surface. The end effector may comprise an electrode comprising a tapered tissue contacting surface. Some surgical instruments may comprise an overload member.

Surgical instrument with jaw member

Various embodiments are directed to an apparatus, system, and method for driving an end effector coupled to an ultrasonic transducer in a surgical instrument. The method comprises generating a first ultrasonic drive signal by a generator coupled to an ultrasonic drive system, actuating the ultrasonic transducer with the first ultrasonic drive signal for a first period, generating a second ultrasonic drive signal by the generator, and actuating the ultrasonic transducer with the second ultrasonic drive signal for a second period, subsequent to the first period. The first drive signal is different from the second drive signal over the respective first and second periods. The first and second drive signals define a step function waveform over the first and second periods. The apparatus comprises a generator configured to couple to an ultrasonic instrument. The system comprises a generator coupled to an ultrasonic instrument. The ultrasonic instrument comprises an ultrasonic drive system comprising an ultrasonic transducer coupled to a waveguide and an end effector coupled to the waveguide, and wherein the ultrasonic drive system is configured to resonate at a resonant frequency.

Ultrasonic device for cutting and coagulating with stepped output

Various embodiments described herein are directed to ultrasonic blades. For example, an ultrasonic blade may comprise a proximally positioned straight section extending along a longitudinal axis and a distally positioned curved section coupled to the straight section and curved away from the longitudinal axis. The curved section may define a radius of curvature and subtend a first angle. A point of tangency between the curved section and the straight section may be positioned at either a node of the ultrasonic blade or an anti-node of the ultrasonic blade.

Surgical instruments with articulating shafts

The invention relates to a high-efficiency driver circuit for capacitive loads, which circuit comprises a drive portion (12) connected to at least one end (X) of a capacitive electric load (11) being applied a voltage waveform. Advantageously, this circuit further comprises a switching circuit portion (13) having its output connected to the above one end (X) of the capacitive load (11) in order to supply a fraction of the overall current demanded by the load (11). Briefly, the invention is a circuit arrangement aimed at providing a highly efficient drive for the capacitive load, using a combined linear/switching setup and without debasing the quality of the waveform generated across the capacitive load.

A high-efficiency driver circuit for capacitive loads

The invention relates to a circuit for highly efficient driving of piezoelectric loads, comprising a linear driving circuit portion connected to the load through an inductive-resistive connection whereto a voltage waveform is applied. Advantageously, the circuit comprises further respective circuit portions, structurally independent, connected in turn to the inductive-resistive connection through respective inductors to supply a considerable fraction of the overall current required by the load in the transient and steady state respectively.

Electronic circuit for highly efficient driving of piezoelectric loads

A method for the automatic design of an electronic circuit includes operations for evaluation of the thermal effects in the electronic circuit. The method generates a layout of the electronic circuit. Abstract data at the substrate level associated to the layout of the electronic circuit is then generated. A grid of partitioning is generated with respect to a view regarding the aforesaid abstract into meshes and nodes. The grid is applied to the substrate. On the basis of the grid (TG), a list of nodes or netlist representing a thermal network that represents the thermal behavior of the substrate or of its portions or elements is extracted. The netlist is useful in simulation operations, in particular of a SPICE type, for making an evaluation of thermal effects in the electronic circuit.

Method for automatic design of an electronic circuit, corresponding system and computer program product

We address the problem of generating Dynamic Compact Thermal Models for non-linear and non-homogeneous heat diffusion problems. We propose a novel Model Order Reduction technique that is based on i) a specifically designed discretization that properly models the non-linear behaviour of different materials, and ii) the introduction of an improved Hyper Reduction method that dramatically reduces the problem dimension. Our experiments show that our method performs similarly to full Finite Volume simulation in terms of accuracy, while being much more computationally efficient.

Giancarlo Zinco

Papers

A high-efficiency driver circuit for capacitive loads

Electronic circuit for highly efficient driving of piezoelectric loads

Method for automatic design of an electronic circuit, corresponding system and computer program product

An Improved Dynamic Compact Thermal Model for Non-Linear and Non-Homogeneous Heat Diffusion Problems