Patent•
Automatic bipolar control for an electrosurgical generator
03 Dec 1993-
TL;DR: 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.
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Patent•
10 Jun 2011
TL;DR: In this article, a surgical stapling device particularly suited for endoscopic procedures is described, which includes a handle assembly and an elongated body extending distally from the handle assembly.
Abstract: A surgical stapling device particularly suited for endoscopic procedures is described The device includes a handle assembly and an elongated body extending distally from the handle assembly The distal end of the elongated body is adapted to engage a disposable loading unit A control rod having a proximal end operatively connected to the handle assembly includes a distal end extending through the elongated body A control rod locking member is provided to prevent movement of the control rod until the disposable loading unit is fully secured to the elongated body of the stapling device
2,013Â citations
Patent•
30 Sep 2004
TL;DR: In this paper, a surgical stapling instrument (1) comprises a body portion (2, 3), a handle (4), and a staple fastening assembly (8), which includes a curved cartridge (10), which comprises at least one curved open row of staples, and a curved anvil (22), which is adapted to cooperate with the cartridge for forming the ends of the staples exiting from the cartridge.
Abstract: A surgical stapling instrument (1) comprises a body portion (2, 3), a handle (4) and a staple fastening assembly (8). The staple fastening assembly (8) includes a curved cartridge (10), which comprises at least one curved open row of staples, and a curved anvil (22), which is adapted to cooperate with the cartridge (10) for forming the ends of the staples exiting from the cartridge (10). The staple fastening assembly (8) is adapted to allow unobstructed access towards the concave inner faces of the cartridge (10) and the anvil (22). The cartridge (10) can be moved towards the anvil (22) from a spaced position for positioning tissue therebetween to a closed position for clamping the tissue. Preferably, a knife is contained within the cartridge (10) and is positioned such that there is at least one row of staples on at least one side of the knife.
1,502Â citations
Patent•
14 Jun 2016
TL;DR: Newness and distinctiveness is claimed in the features of ornamentation as shown inside the broken line circle in the accompanying representation as discussed by the authors, which is the basis for the representation presented in this paper.
Abstract: Newness and distinctiveness is claimed in the features of ornamentation as shown inside the broken line circle in the accompanying representation.
1,500Â citations
Patent•
21 Apr 2011TL;DR: In this paper, a surgical instrument can comprise a channel configured to support a staple cartridge and, in addition, an anvil pivotable between open and closed positions relative to the channel.
Abstract: A surgical instrument can comprise a channel configured to support a staple cartridge and, in addition, an anvil pivotable between open and closed positions relative to the channel. The surgical instrument can further comprise a cutting member configured to incise tissue positioned captured between the staple cartridge and the anvil and, in addition, means for stopping the cutting member prior to a distal end datum, wherein the distal end datum can be defined by the distal-most staple cavity in the staple cartridge. In such embodiments, the incision within the tissue may not extend beyond the portion of the tissue that has been stapled.
1,498Â citations
Patent•
19 Jun 1996TL;DR: In this article, the authors present a controller that can cause the generator to supply a blended output signal alternating constantly between a first output signal across the output connections in which the radio frequency output voltage developed across output connections is limited to at least a first predetermined threshold value for cutting or vaporization of tissue, and a second output signal with a power supply coupled to the output stage for supplying power to output stage.
Abstract: In an electrosurgical generator for generating radio frequency power, the generator includes a radio frequency output stage having two or more output connections, and a power supply coupled to the output stage for supplying power to the output stage. A controller is operable to cause the generator to supply a blended output signal alternating constantly between a first output signal across the output connections in which the radio frequency output voltage developed across the output connections is limited to at least a first predetermined threshold value for cutting or vaporisation of tissue, and a second output signal across the output connections in which the radio frequency output voltage developed across the output connections is limited to a second threshold value for coagulation. There is also provided adjustment means, operable by a user of the electrosurgical generator, for changing between various preset settings for the blended signal, the preset settings each having a predetermined duty cycle of the blended signal that is limited to the first threshold value for cutting or vaporisation, and a predetermined duty cycle of the blended signal that is limited to the second threshold value for coagulation.
1,486Â citations
References
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Patent•
[...]
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.
Abstract: An electrosurgical bipolar RF generator apparatus includes a bipolar electrode. An aperiodic sequence of uniform width bursts of a high frequency signal are electronically synthesized. Substantially identical decaying amplitude envelopes are impressed on the bursts of the high frequency signal. Each of the envelopes has a predetermined rate of change from a preselected initial amplitude. The impressed bursts of the high frequency signal are applied to the electrode. The electrical apparatus operates in a cut mode or a coagulation mode. The apparatus includes a power supply for providing a variable DC voltage, a short circuit detect circuit for detecting a short circuit at the bipolar electrode, and an open circuit detector for detecting an open circuit at the bipolar electrode.
354Â citations
Patent•
20 Nov 1979
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.
Abstract: The appts. has a HF current generator providing a cutting and/or coagulation current. This is supplied at predetermined intervals, with the duration of these intervals as well as the length of the pauses between them being preselected. Pref. the appts. has two rotary switches (1,2) which are used respectively to select the intensity of the cutting current and the coagulation current, with a dual push-button switch (3) used to select either or both of these currents. Two further rotary switches (4,5) respectively control the duration of the pulse intervals and the pauses between them, with a second dual push-button switch (6) for selection of individual pulses or a pulse series.
305Â citations
Patent•
13 Sep 1975
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.
Abstract: 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. The delay time of the relay is adjustable and the relay switches on the coagulation current only when the electrical resistance between two arms contact the tissue to be coagulated lies within a given range. Due to the time lag in switching on the coagulation current, tissue portions to be coagulated can first be withdrawn from a larger tissue formation or prepared. Also the tweezers can be more readily manufactured and cleaned compared with use of a manual switch on the tweezers. The generator may carry a current indicator.
302Â citations
Patent•
23 Mar 1985
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.
Abstract: A control device for a high-frequency surgical instrument is described, which permits the activation of the high-frequency 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. This control device is extended to form an automatic coagulation device.
302Â citations
Patent•
04 Jul 1991
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.
Abstract: The surgical instrument is connected to the h.f. leads output (33,34) of a h.f. generator (10) via a h.f. coupling transformer (11) to supply the electrodes (16,17,16',17'). A monitoring circuit (20) detects the voltage at the latter and evaluates it to deliver a switch-off signal to the h.f. generator. The monitoring circuit includes a differential circuit (21) with a d.c. voltage at its input that is proportional to the amplitude curve of the h.f. electrode voltage. Its output signal is delivered to a switch-off unit (23) actuating the h.f. generator. ADVANTAGE - Technically simple circuitry ensuring reliable automatic switching off of power after completion of contact coagulation. This ensures optimal result in each case.
299Â citations