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

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

In one general aspect, various embodiments are directed to a surgical instrument that can supply mechanical energy and electrical energy to an end effector of the surgical instrument. The surgical instrument may be operated in a first operating mode in which a transducer of the surgical instrument produces mechanical energy, or vibrations, that are transmitted to the end effector and a second operating mode in which electrical energy, or current, can flow through the end effector to perform electrosurgery. In another general aspect, the surgical instrument may comprise a clamp, or jaw, which can be moved into a closed position to hold tissue against a waveguide, or blade, of the end effector. In the second operating mode of the surgical instrument, current can flow from a power source, through the waveguide, and return to the power source through a path comprising the jaw.

Electrosurgery generator for ultrasonic surgical instruments

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 method for operating a piezoelectric element, wherein a first voltage (1) is applied to a piezoelectric element, said voltage effecting a first deflection by a travel (w) of the piezoelectric element, and an electric discharge of the piezoelectric element after application of the first voltage effecting a first contraction of the piezoelectric element by a first compression (x). After the first contraction, a second voltage (2) is applied to the piezoelectric element, said voltage having an opposite polarity relative to the first voltage (1) and effecting a further contraction of the piezoelectric element by a second compression (y). A repeated application of the first voltage (1) after the electric discharge of the applied second voltage (2) effects a deflection of the piezoelectric element by the same travel (w).

Method for operating a piezoelectric element

Es wird ein Verfahren zum Betrieb eines Piezoelements angegeben, bei dem an einem Piezoelement eine erste Spannung (1) angelegt wird, welche eine erste Auslenkung des Piezoelements mit einem Hub (w) bewirkt, und eine elektrische Entladung des Piezoelements nach dem Anlegen der ersten Spannung ein erstes Zusammenziehen des Piezoelements um eine erste Stauchung (x) bewirkt. Nach dem ersten Zusammenziehen wird eine zweite Spannung (2) an dem Piezoelement angelegt, die eine gegenuber der ersten Spannung (1) entgegen gesetzte Polaritat aufweist und ein weiteres Zusammenziehen des Piezoelements um eine zweite Stauchung (y) bewirkt. Ein wiederholtes Anlegen der ersten Spannung (1) nach der elektrischen Entladung der angelegten zweiten Spannung (2) bewirkt eine Auslenkung des Piezoelements mit dem gleichen Hub (w).

Verfahren zum betrieb eines piezoelements

The aim of the invention is to integrate an LTCC balun in the microwave ceramic body of a duplexer without increasing the total height of said duplexer. To achieve this, the height of the ceramic body in the vicinity of the RX filter is reduced to a surface area that corresponds to the size of the LTCC balun. A compact component, which can deliver a symmetrical output signal for the RX path without a volume increase, is thus obtained without modification to the characteristics of the TX filter.

Low-rise duplexer

Es wird vorgeschlagen, einen in LTCC-Bauweise realisierten Balun so in den Mikrowellen-Keramikkorper eines Duplexers einzubauen, das die Gesamtbauhohe des Duplexers nicht erhoht wird. Dazu wird die Hohe des Keramikkorpers im Bereich des RX-Filters auf einer Flache reduziert, die der Grose des LTCC-Baluns entspricht. Bei unveranderten Eigenschaften des TX-Filters wird so ein kompaktes Bauelement erhalten, welches ohne Volumenvergroserung fur den RX-Pfad ein symmetrisches Ausgangssignal liefern kann.

Alenko Lic

Papers

Method for operating a piezoelectric element

Verfahren zum betrieb eines piezoelements

Low-rise duplexer

Duplexer mit niedriger bauhöhe