130 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.

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 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. 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.

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.

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.

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.

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.