Patent
Automatic bipolar control for an electrosurgical generator
Reads0
Chats0
TLDR
In this paper, an automatic circuit measures electrosurgical generator output and controls in accord with impedance between activated movable bipolar electrodes able to contact tissue, and assesses changes in impedance between the electrodes.Abstract:
An automatic circuit measures electrosurgical generator output and controls in accord with impedance between activated movable bipolar electrodes able to contact tissue. Voltage monitor in parallel and current monitor in series with the electrodes measure instantaneous variations and generate proportional signals. First and second calculators receive the signals and find respectively, by dividing the voltage by current, short circuit impedances and impedances other than short circuit impedances between the electrodes. First and second comparators receive the respective outputs from the first and second calculators and assess them against respective first and second references providing signs of short conditions and assessments of changes in impedance between the electrodes. A logic analyzer receives the signs and assessments and evaluates them to permit the instantaneous starting, operating or stopping of the electrosurgical generator. The electrodes include an instrument and a set of cables with a preselected combined impedance so the maximum instantaneous impedance between the electrodes is less than the preselected combined impedance. The second reference is user adjustable. Switches, associated with each of the voltage monitor and the current monitor, choose the gain applied to the proportional signals respectively therefrom. First and second calculator gain changers receive the signals for setting the range across which those respective signals are used. Methods have steps of monitoring voltage and current, generating signals, dividing the voltage signal by current signal to find short circuit impedance between the electrodes and the instantaneous changes in impedance for other than the short circuit impedance, assessing those findings against references and permitting the starting, operating, or stopping of the electrosurgical generator.read more
Citations
More filters
Patent
Surgical stapling instruments with cam-driven staple deployment arrangements
TL;DR: In this article, a surgical cutting and fastening instrument with a shaft coupled to a robotic system is described. But the tool mounting portion includes an electric, DC motor connected to a drive train in the shaft for powering the drive train.
Patent
Systems and methods for providing alerts according to the operational state of a surgical instrument
TL;DR: In this paper, a surgical instrument is configured to determine a velocity of a displacement member and, upon the velocity being equal to zero, provide an alert according to the operational state of the instrument and the relative position of the displacement member in its stroke.
Patent
Robotically-controlled motorized surgical instrument
TL;DR: In this article, a surgical cutting and fastening instrument that is motorized and configured for operation in connection with a robotic system is presented, which comprises in one embodiment a charge accumulator device, separate from a battery, that provides additional power to the motor under certain conditions.
Patent
Positive shaft rotation lock activated by jaw closure
TL;DR: In this paper, the rotation locking mechanism is configured to prevent an axial rotation of the end effector and the shaft portion relative to the housing in the open configuration and to prevent the rotation in the closed configuration.
Patent
Methods of operating surgical end effectors
TL;DR: In this paper, the first and second jaws are pivotally coupled together and are selectively movable between a fully open position and a fully closed position, and the dynamic clamping assembly in direction configured to contact at least one positive jaw opening feature on the pivotal coupled jaws with to move them from the fully open to the fully closed positions.
References
More filters
Patent
Bipolar RF generator
Jerry L. Malis,Leonard I. Malis,Robert R. Acorcey,Harry E. Klaus,David L. Solt,Frank DiJoseph +5 more
TL;DR: In this paper, an electrosurgical bipolar RF generator with a bipolar electrode is described. But the generator operates in a cut mode or a coagulation mode, and the electrical apparatus includes a power supply for providing a variable DC voltage, short circuit detect circuit for detecting a short circuit at the bipolar electrode.
Patent
HF surgical appts. for use with endoscope - provides cutting or coagulation current at preset intervals and of selected duration
Guenter Farin,Peter Puetz +1 more
TL;DR: In this article, a rotary switch is used to select the intensity of the cutting current and the coagulation current, with a dual push-button switch (3,4,5) to select either or both of these currents.
Patent
Circuit for bipolar coagulation tweezers - permits preparation of tissues prior to coagulation
TL;DR: Coagulation tweezers have arms which are electrically insulated from each other, and a time-lag relay for switching on a hf. generator to generate the coagulation current.
Patent
Control device for a high-frequency surgical instrument
Guenter Farin,Peter Puetz,Gerhard Prof Dr I Flachenecker,Karl Prof Dr Ing Fastenmeier,Heinz Prof Dr Ing Lindenmeier +4 more
TL;DR: In this article, a control device for a high-frequency surgical instrument is described, which permits the activation of the highfrequency generator for cutting or coagulating only if and only as long as the active monopolar electrode and the neutral electrode or both poles of a bipolar electrode simultaneously have electrically conductive contact with tissue of the same patient.
Patent
Electro-surgical HF instrument for contact coagulation - has monitoring circuit evaluating HF voltage at electrodes and delivering switch=off signal
TL;DR: In this paper, the surgical instrument is connected to the h.f. generator via a coupling transformer to supply the electrodes (16,17,16',17'), and a monitoring circuit detects the voltage at the latter and evaluates it to deliver a switch-off signal to the generator.