133 results about "Vessel sealing" patented technology

An electrosurgical generator has an output power control system that causes the impedance of tissue to rise and fall in a cyclic pattern until the tissue is desiccated. The advantage of the power control system is that thermal spread and charring are reduced. In addition, the power control system offers improved performance for electrosurgical vessel sealing and tissue welding. The output power is applied cyclically by a control system with tissue impedance feedback. The impedance of the tissue follows the cyclic pattern of the output power several times, depending on the state of the tissue, until the tissue becomes fully desiccated. High power is applied to cause the tissue to reach a high impedance, and then the power is reduced to allow the impedance to fall. Thermal energy is allowed to dissipate during the low power cycle. The control system is adaptive to tissue in the sense that output power is modulated in response to the impedance of the tissue.

Systems, methods, and apparatus for providing power to an electrosurgical instrument. In particular, a power supply is disclosed in which non-sinusoidal (e.g., pulsed) constant frequency voltage having a variable amplitude is passed to an LC circuit to produce a quasi-sinusoidal current in the LC circuit. The constant driving frequency can be one half the resonant frequency of the LC circuit allowing the LC circuit to operate as an impedance, and thus limit current spikes and arcing. The frequency and phasing of the driving voltage also enables the LC circuit to discharge energy back into a power provider of the power supply so that energy does not build up in the LC circuit. These features result in less severe current spikes and arcing, as well as reduced cutoff times.

An electrosurgical system includes an electrosurgical instrument, an electrosurgical power generating source, and a controller. The electrosurgical instrument includes a shaft extending from a housing. The shaft includes a distal end configured to support an end-effector assembly. The end-effector assembly includes opposing jaw members movably mounted with respect to one another and moveable from a first position in spaced relation relative to one another to at least one subsequent position wherein the jaw members cooperate to grasp tissue therebetween. At least one of the jaw members includes a temperature-sensing electrically-conductive tissue-contacting plate defining a bottom surface. One or more temperature sensors are coupled to the bottom surface. The controller is configured to control one or more operating parameters associated with the electrosurgical power generating source based on one or more signals indicative of a tissue impedance value and indicative of a temperature sensed by the one or more temperature sensors.

A surgical instrument includes a housing having a shaft affixed thereto, a reciprocatable drive rod slideably disposed at least partially within the shaft, and a force applicator coupled to the drive rod. The shaft includes first and second jaw members attached to a distal end thereof, at least one of which movable relative to the other from a first position wherein the jaw members are disposed in spaced relation relative to one another to at least a second position closer to one another wherein the jaw members cooperate to grasp tissue therebetween. The force applicator and the drive rod mechanically communicate to impart movement to at least one of the jaw members. The bipolar forceps includes a handle assembly and a force-balance interface. The force-balance interface configured to translate a multiple of the user-applied force exerted on the handle assembly into the jaw members.

An electrosurgical system for sealing vessels using capacitive (RF) dielectric heating and a method thereof are provided. The system includes an electrosurgical instrument having an end effector with parallel plate electrodes that will clamp onto a vessel and maintain a specified gap distance; however, the electrodes will be coated with a non-conductive dielectric material. Such an end effector will ensure that direct conduction between the electrodes does not occur through tissue or fluids and effectively creates a parallel plate capacitor with a dielectric, e.g., tissue and coating, in between the plates. The electrosurgical instrument will be activated with an AC signal at a specified RF frequency, e.g., a Debye resonance frequency, via an electrosurgical generator. An effective AC current will flow through the tissue and cause heating due to fictional losses from rotating polar molecules in the tissue.

An end effector assembly for use with an instrument for sealing vessels and cutting vessels includes a pair of opposing first and second jaw members which are movable relative to one another from a first spaced apart position to a second position for grasping tissue therebetween. Each jaw member includes an electrically conductive tissue contacting surface connected to an electrosurgical energy source. At least one of the jaw members includes an electrically conductive cutting element disposed within an insulator defined in the jaw member. At least one channel is included in the insulator which is configured to deliver fluid between the jaw members.

An apparatus for sealing a puncture extending through tissue to a blood vessel includes a guidewire including an expandable tamp, a retaining sheath for covering the tamp, and a delivery sheath including a primary lumen for receiving the guidewire therethrough and a secondary lumen for delivering sealing compound into the puncture. The guidewire is advanced into the puncture with the tamp in a contracted condition, the tamp is expanded within the vessel after retracting the retaining sheath, and the guidewire is retracted to seal the puncture from the vessel. The delivery sheath is advanced over the guidewire, and sealing compound is introduced into the puncture through the delivery sheath. After introducing the sealing compound, the delivery sheath is removed, and an introducer sheath is advanced over the guidewire to provide access to perform a medical procedure via the vessel after removing the guidewire.

An internal tissue puncture closure method and apparatus provides a locking device for compressing and holding an external component such as a collagen sponge at a puncture situs. The locking device facilitates compression of the external component in a first direction, but prevents or locks against retraction.

An internal tissue puncture closure method and apparatus. The method and apparatus provide a locking device for compressing and holding an external component such as a collagen sponge at a puncture situs. The locking device facilitates compression of the external component in a first direction, but prevents or locks against retraction.

An implantable, bioresorbable and / or biodegradable sealing member, such as a staple, clip, snap or rivet, is used for clamping vessels, vessel side-branches, aneurysms, or any other tube like body-parts or for sealing vascular access sites and wound site management. The implantable, bioresorbable and / or biodegradable member comprises a combination of materials which dissolve or degrade in the human body without any harmful effects on the person that wears the member.

The present disclosure relates to an end effector assembly for use with an electrosurgical instrument. The end effector assembly includes a pair of opposing first and second jaw members and a first electrically conductive cutting plate. The pair of opposing first and second jaw members is movable to cooperatively grasp tissue. Each of the jaw members includes a tissue contacting plate that is disposed thereon and has a longitudinal channel that is defined therealong. The first electrically conductive cutting plate includes a cutting element that extends along the first electrically conductive cutting plate and into the longitudinal channel of the first jaw member to engage and electrosurgically sever tissue upon activation thereof.

An open electrosurgical forceps is provided and includes a pair of first and second shaft members each having a jaw member at a distal end thereof. The jaw members are movable from a first position in spaced relation relative to one another to a subsequent position wherein the jaw members cooperate to grasp tissue therebetween. A cutting mechanism is adapted to selectively and removably couple to one of the first and second shaft members. The cutting mechanism includes a cutting trigger for selectively advancing a knife blade extending therefrom through a knife channel defined along one or both of the jaw members. The first shaft member includes a stop feature formed thereon and the second shaft feature includes a stop member formed thereon. The stop feature and stop member configured to selectively engage one another to limit rotation of the first and second shaft members with respect to one another.

A square wave generator suitable for use with an electrosurgical device is provided. The square wave generator includes a voltage source configured to output a waveform and a comparator operatively coupled to the voltage source and configured to output energy in the form of a square wave. The generator may also include at least one sensor configured to sense an operational parameter of the energy outputted from the comparator and to provide a sensor signal corresponding thereto and a controller adapted to receive the at least one sensor signal and in response thereto control the voltage source.

An open electrosurgical forceps includes a pair of first and second shaft members each having a jaw member disposed at its distal end. The jaw members are movable from a first position in spaced relation relative to one another to a subsequent position wherein the jaw members cooperate to grasp tissue. Each of the jaw members includes an electrically conductive scaling plate for communicating electrosurgical energy through tissue. A curved knife channel is defined along the length of one of the jaw members and is dimensioned to reciprocate a cutting mechanism. An actuator selectively advances the cutting mechanism from a first position proximal to tissue held between the jaw members to a subsequent position distal to tissue held between the jaw members. The cutting mechanism includes a generally hourglass-shaped flexible blade having a mutually aggregating notch.

An electrosurgical forceps is provided and includes a housing, a shaft and a pair of opposing first and second jaw members. Each jaw member including a pair of spaced apart, electrically conductive tissue sealing surfaces adapted to connect to a source of electrosurgical energy such that the tissue sealing surfaces are capable of conducting electrosurgical energy through tissue held therebetween to effect a seal. One or both of the first and second jaw members includes an electrically conductive cutting element disposed thereon. A switch assembly operably disposed on the housing includes an activation member in operable communication with the source of electrosurgical energy for supplying electrosurgical energy to the first and second jaw members. Activation of the activation member provides electrosurgical energy to the tissue sealing surfaces for sealing tissue and electrosurgical energy to the cutting element for cutting the sealed tissue.

An open electrosurgical forceps includes a pair of first and second shaft members each having a jaw member disposed at its distal end. The jaw members are movable about a pivot assembly from an open position in spaced relation relative to one another to a closed position wherein the jaw members cooperate to grasp tissue. Each of the jaw members includes an electrically conductive sealing surface for communicating electrosurgical energy through grasped tissue. One or both of the jaw members includes a knife channel defined along its length. The pivot assembly includes a knife slot and is configured to prevent reciprocation of a cutting mechanism when the jaw members are disposed in the open position and to permit reciprocation of the cutting mechanism when the jaw members are disposed in the closed position. An actuator selectively advances the cutting mechanism from a first position to at least one subsequent position.

A bipolar electrosurgical instrument is provided. The bipolar electrosurgical instrument includes first and second shafts each having a jaw member extending from a distal end thereof and a handle disposed at a proximal end thereof for effecting movement of the jaw members relative to one another. A first conductive lead is adapted to connect to a first electrical potential and a second conductive lead is adapted to connect to a second electrical potential. One of the first and second conductive leads extends through the pivot to connect to a respective jaw member.

A method of and apparatus for sealing access openings into blood vessels using an expandable member in the blood vessel on a control member that extends out through the access opening and an applicator which inserts a preformed sealing material into the access opening over the control member to keep the control member and expandable member centered in the access opening and withdrawing the collapsed expandable member back through the sealing material after the access opening is sealed.

An end effector assembly for use with an electrosurgical instrument is provided. The end effector assembly includes a pair of opposing jaw members configured to grasp tissue therebetween, at least one jaw member adapted to connect to a source of electrosurgical energy to seal tissue disposed between jaw members during a sealing process. At least one of the jaw members includes an activator configured to selectively impart mechanical perturbations to the at least one jaw member during the sealing process.

An open electrosurgical forceps includes a pair of first and second shaft members each having a jaw member disposed at its distal end. The jaw members are movable about a pivot assembly from an open position in spaced relation relative to one another to a closed position wherein the jaw members cooperate to grasp tissue. Each of the jaw members includes an electrically conductive sealing surface for communicating electrosurgical energy through grasped tissue. One or both of the jaw members includes a knife channel defined along its length. The pivot assembly includes a knife slot and is configured to prevent reciprocation of a cutting mechanism when the jaw members are disposed in the open position and to permit reciprocation of the cutting mechanism when the jaw members are disposed in the closed position. An actuator selectively advances the cutting mechanism from a first position to at least one subsequent position.

An electrosurgical system for sealing vessels using capacitive (RF) dielectric heating and a method thereof are provided. The system includes an electrosurgical instrument having an end effector with parallel plate electrodes that will clamp onto a vessel and maintain a specified gap distance; however, the electrodes will be coated with a non-conductive dielectric material. Such an end effector will ensure that direct conduction between the electrodes does not occur through tissue or fluids and effectively creates a parallel plate capacitor with a dielectric, e.g., tissue and coating, in between the plates. The electrosurgical instrument will be activated with an AC signal at a specified RF frequency, e.g., a Debye resonance frequency, via an electrosurgical generator. An effective AC current will flow through the tissue and cause heating due to fictional losses from rotating polar molecules in the tissue.

An end effector assembly includes a pair of opposing jaw members movable from a first position in spaced relation relative to one another to at least one subsequent position wherein the jaw members cooperate to grasp tissue therebetween. Each of the jaw members includes a microwave antenna assembly and a shielding member including a metallic plate coupled to ground and a dielectric material. The end effector assembly also includes a splitter configured to receive an active signal from a source of microwave energy and split the active signal into a first signal transmitted to the microwave antenna assembly in one of the jaw members and a second signal transmitted in the microwave antenna assembly in the other jaw member.

Systems and methods are provided for displaying an image of a tracked tool on a user interface, wherein at least a portion of the tool is hidden from view in any image on a user interface at any point during a procedure. The tool may include a cutting tool having jaws for clamping a material and a knife for cutting the clamped material, and superimposing an indicator of a knife position on the display during and / or after cutting. The knife position may include a location and / or orientation of the knife, including any or all of a pre-cut, cut-complete, cut-incomplete and an exposed position. The disclosed systems and methods allows a user to view the knife position in applications where the knife may not be visible to a user, which is particularly useful for clamping and cutting a body tissue with a robotic surgical system in minimally invasive procedures.