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 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

Various embodiments are direct to a surgical instrument comprising and end effector, an articulating shaft and an ultrasonic transducer assembly. The end effector may comprise an ultrasonic blade. The articulating shaft may extend proximally from the end effector along a longitudinal axis and may comprise a proximal shaft member and a distal shaft member pivotably coupled at an articulation joint. The ultrasonic transducer assembly may comprise an ultrasonic transducer acoustically coupled to the ultrasonic blade. The ultrasonic transducer assembly may be positioned distally from the articulation joint.

Ultrasonic surgical instruments with distally positioned transducers

Various embodiments are directed to an apparatus and method of driving an end effector coupled to an ultrasonic drive system of a surgical instrument. The method comprises generating at least one electrical signal. The at least one electrical signal is monitored against a first set of logic conditions.

Devices and techniques for cutting and coagulating tissue

A surgical tool is disclosed. The surgical tool has a tool mounting portion having a tool mounting housing, a tool mounting plate, and a coupler to couple a shaft assembly with an articulation section to the tool mounting portion. An articulation mechanism is located within the tool mounting portion and is configured to receive a proximal end of the shaft assembly to articulate the articulation section of the shaft assembly. An interface mechanically and electrically couples the tool mounting portion to a manipulator.

Robotically controlled surgical instrument

Embodiments of a system and method for providing efficient wideband inverse channelization for direct digital synthesizer based jamming techniques are generally described herein. In some embodiments, metadata associated with a technique for generating a waveform, such as frequency, phase and amplitude parameters, is received. Data select signals and data input are generated based on the received metadata. In-phase and quadrature signals are produced at an output of a first de-multiplexer and a second de-multiplexer, respectively, based on the data select signals and the data input. Frequency modulated signals generated by direct digital synthesizers may be combined in a channel using a separate, distinct channel combiner.

Circuits and method to enable efficient generation of direct digital synthesizer based waveforms of arbitrary bandwidth

Embodiments for providing side lobe modulation in a radio frequency (RF) transmitting are generally described herein. In some embodiments, an antenna side lobe is modulated to add data to the side lobe for communication with an intended recipient.

Side Lobe Modulation System and Related Techniques

A system and method for allocating resources receive one or more resource requests describing tasks, each of the one or more resource requests having a request priority, a requested configuration type, and a requestor identifier. In a winner-take-all circuit, all of the existing resource priorities within each configuration of the requested configuration type are compared to determine a highest-priority task occupying each assignment. In a loser- take-all circuit, one or more current highest resource priorities of each configuration within the requested configuration type, which are output from the winner-take-all circuit associated with the requested resource assignment, each of the one or more current resources having a current priority, are compared.

Apparatus and method for allocating resources using prioritization of requests and updating of requests

A method for concurrent transmission of different signal types by a radar system includes: receiving a waveform request for transmitting a first signal type and a second signal type; determining whether the first signal or the second signal is optimized; when the first signal is optimized: transmitting the first and the second signal simultaneously in separate bands; and when the second signal is optimized: determining a time gap between transmission of the second signal, and adjusting pulse repetition interval (PRI) or pulse width of the first signal to fit in the time gap, transmitting the second signal, and transmitting the first signal in the time gap between the transmission of the second signal.

System and method for concurrent communication of different signal types by a radar

A reconfigurable discrete time analog signal processor includes a finite impulse response (FIR) filter configured to receive a portion of an RF transmit signal, to receive FIR coefficients, and to generate a leakage cancellation signal based on the portion of the RF transmit signal and the FIR coefficients, the FIR filter including sample and hold (SH) circuits configured to receive the portion of the RF transmit signal, to sample the portion of the RF transmit signal at successive sample times according to a sample clock, and to generate sampled analog voltage signals, and analog multipliers coupled to the SH circuits and configured to multiply the sampled analog voltage signals by binary multiplication factors to generate the leakage cancellation signal.

Harry B. Marr

Papers

Circuits and method to enable efficient generation of direct digital synthesizer based waveforms of arbitrary bandwidth

Side Lobe Modulation System and Related Techniques

Apparatus and method for allocating resources using prioritization of requests and updating of requests

System and method for concurrent communication of different signal types by a radar

Discrete time analog signal processing for simultaneous transmit and receive