公开(公告)号：WO1997010763A1

公开(公告)日：1997-03-27

申请号：PCT/IB1996000669

申请日：1996-07-11

Applicant: VALLEYLAB INC.

Inventor： VALLEYLAB INC. ,  BUYSSE, Steven, Paul ,  KENNEDY, Jenifer, Serafin ,  LUKIANOW, Stephen, Wade ,  RYAN, Thomas, Patrick

IPC: A61B17/39

CPC classification number: A61B18/1206 ,  A61B18/12 ,  A61B2017/00026 ,  A61B2017/2932 ,  A61B2018/00702 ,  A61B2018/00779 ,  A61B2018/00869 ,  A61B2018/00875 ,  A61B2018/00892

Abstract: Electrosurgical energy is used in combination with a surgical tool (12) to seal vessels and vascular tissue of a patient (13). One of the important advances of the present system is that is can effectively seal vessels of a patient (13) without leaving any foreign material in the body of the patient (13). The present system is also capable of sealing vessels as large as ten millimeters in diameter. Another advantage of the present system is that the surgeon can visually inspect the integrity of the seal. The invention works with a combination of pressure and controlled application of electrosurgical energy to achieve the desired result. A surgical tool (12) is used to grasp and apply an appropriate amount of closure force to the tissue of the patient (13). The tool is capable of conducting electrosurgical energy to the tissue concurrently with the application of the closure force. A method for sealing vessels and vascular tissue of a patient (13) includes the steps of applying pressure to the vessels and other tissues of the patient (13); applying a first level of electrosurgical power to the vessels and other tissues sufficient to melt proteins in the tissue; applying a second level of electrosurgical power to the vessels and other tissues sufficient to cause desiccation without charring; reducing the electrosurgical power substantially to zero for a length of time sufficient to allow the vessels and other tissues to cool into a new compressed form; and relieving the pressure on the tissue.

Abstract translation: 电外科能量与外科手术工具（12）组合使用以密封患者（13）的血管和血管组织。 本系统的重要进展之一是可以有效地密封患者（13）的血管，而不会在患者体内（13）中留下任何异物。 本系统还能够密封直径达10毫米的容器。 本系统的另一个优点是外科医生可以目视检查密封的完整性。 本发明结合压力和电外科能量的受控应用来实现期望的结果。 外科手术工具（12）用于把握和施加适当量的闭合力给患者（13）的组织。 该工具能够在施加闭合力的同时对组织进行电外科能量。 用于密封患者（13）的容器和血管组织的方法包括对患者（13）的容器和其他组织施加压力的步骤; 对血管和其他组织施加足以融化组织中的蛋白质的电外科功能; 对足以引起干燥而不烧焦的血管和其他组织施加第二级电外科手术力; 将电外科手术功率基本上降低至零足以允许血管和其它组织冷却成新的压缩形式的时间长度; 并减轻对组织的压力。

公开(公告)号：WO1996039086A1

公开(公告)日：1996-12-12

申请号：PCT/IB1996000549

申请日：1996-06-03

Applicant: VALLEYLAB INC.

Inventor： VALLEYLAB INC. ,  BELL, Gregory, J. ,  KLICEK, Michael, S. ,  PATERSON, William, G.

IPC: A61B17/39

CPC classification number: A61B18/1206 ,  A61B2018/0016 ,  A61B2018/00666 ,  A61B2018/00702 ,  A61B2018/00791 ,  A61B2018/00827 ,  A61B2018/00869 ,  A61B2018/00875 ,  A61B2018/1253

Abstract: A power control system for an electrosurgical generator (11) will control the output power to desired levels. The power control system uses a simple closed-loop control algorithm. Sensors in the electrosurgical generator (11) will monitor changes in output current and output voltage. There may also be sensors to monitor changes in the temperature of the electrosurgical tool, mechanical strain in the electrosurgical tool, or phase shift between output voltage and output current. A microprocessor (19) in the electrosurgical generator (11) is connected to the sensors and repetitively compares the sensed values against their respective threshold values. The threshold values are computed by the microprocessor (19) based on the desired output power, or other desired tissue effects. The microprocessor (19) also has an output to control an adjustable high voltage power supply (15) in the electrosurgical generator (11). The microprocessor (19) will adjust the high voltage power supply (15) to maintain all sensed values below their respective threshold values. The threshold values are computed by the microprocessor (19) based on the desired output power, or other desired tissue effects. The threshold values may also be computed as a function of the impedance of the output load on the electrosurgical generator (11).

Abstract translation: 用于电外科发生器（11）的功率控制系统将将输出功率控制到期望的水平。 功率控制系统采用简单的闭环控制算法。 电外科发生器（11）中的传感器将监测输出电流和输出电压的变化。 还可以有传感器来监测电外科手术工具的温度变化，电外科手术工具中的机械应变或输出电压与输出电流之间的相移。 电外科发生器（11）中的微处理器（19）连接到传感器，并将感测值与它们各自的阈值重复比较。 阈值由微处理器（19）基于期望的输出功率或其他期望的组织效应计算。 微处理器（19）还具有用于控制电外科发生器（11）中的可调高压电源（15）的输出。 微处理器（19）将调节高压电源（15）以将所有感测值保持在其各自的阈值以下。 阈值由微处理器（19）基于期望的输出功率或其他期望的组织效应计算。 也可以根据电外科发生器（11）上的输出负载的阻抗来计算阈值。

公开(公告)号：WO1996023448A1

公开(公告)日：1996-08-08

申请号：PCT/IB1996000003

申请日：1996-01-03

Applicant: VALLEYLAB, INC.

Inventor： VALLEYLAB, INC. ,  GRASSO, Kamala, J. ,  KETCHAM, Cliff ,  LEINER, Kevin ,  PACER, Lawrence, K. ,  SANCHEZ, Teresa

IPC: A61B17/39

CPC classification number: A61B18/1402 ,  A61B2218/008 ,  A61M1/008

Abstract: An aspirator attachment (10) for an electrosurgical pencil (11) has an axis and an electrode (12) at a distal end (13) thereof to transmit vacuum to remove fluid from an operative site. A semi-rigid hollow body (14) extends parallel to the axis and is contoured to fit coextensively against the elongate pencil. A body passage (15) has an opening (16) at its distal part (17) that is about the electrode (12) and facing toward the patient. The part conjugates aft of the electrode (12) for generally fluid tight pencil engagement. The opening (16) is scalloped with opposed edges increasing visibility, decreasing tissue trapping and decreasing electrode (12) temperature. A part port (21) between the conjugating end (18) and its opening (16) communicates with the passage (15) and the opening (16). A connector (22) at the body end opposite the opening (16) is shaped for fluid communication with the passage (15) and vacuum. A body center section, between the port (21) and the connector (22) joins them. An offset transition (27) of the body, adjacent the pencil conjugating end (18), has the passage (15) therethrough for connecting the port (21) and the center section and alignment. The passage (15) has a uniform cross sectional area extending therein. A swivel (23) attached to the connector (22) permits relative rotation between the pencil and a vacuum hose. The center section at the connector (22) has a rib (24) to engage the pencil retaining the opening (16) about the distal end (13) and resisting movement. The passage (15) within the center section has a generally D shaped cross section. The pencil has controls along a side thereof and the body mates with the pencil opposite the controls. Methods of combining and using the pencil and aspirator include steps of engaging and nesting them together.

Abstract translation: 用于电外科手术铅笔（11）的抽吸器附件（10）具有在其远端（13）处的轴线和电极（12），以透射真空以从手术部位移除流体。 半刚性中空主体（14）平行于轴线延伸并且被成形为与伸长的铅笔共同配合。 身体通道（15）在其远端部分（17）处具有围绕电极（12）并面向患者的开口（16）。 所述部件将电极（12）的后部共轭，用于大体上流体密封的铅笔接合。 开口（16）扇形化，具有相对边缘，增加可见度，减少组织捕获和降低电极（12）的温度。 共轭端（18）与其开口（16）之间的部分端口（21）与通道（15）和开口（16）连通。 在与开口（16）相对的主体端部处的连接器（22）成形为用于与通道（15）和真空流体连通。 在端口（21）和连接器（22）之间的身体中心部分连接它们。 与铅笔共轭端（18）相邻的本体的偏移转变（27）具有用于连接端口（21）和中心部分并对准的通道（15）。 通道（15）具有在其中延伸的均匀横截面积。 附接到连接器（22）的旋转件（23）允许铅笔和真空软管之间的相对旋转。 连接器（22）的中心部分具有肋（24），用于接合围绕远端（13）保持开口（16）并抵抗运动的铅笔。 中心部分内的通道（15）具有大致D形的横截面。 铅笔沿其一侧具有控制，并且身体与与控件相对的铅笔相配合。 组合和使用铅笔和抽吸器的方法包括将它们接合并嵌套在一起的步骤。

公开(公告)号：WO1996019151A1

公开(公告)日：1996-06-27

申请号：PCT/IB1995000826

申请日：1995-10-02

Applicant: VALLEYLAB, INC.

Inventor： VALLEYLAB, INC. ,  MAKOWER, Joshua ,  ZIEVE, David, A. ,  BARBER, Frank

IPC: A61B17/36

CPC classification number: A61B18/1206 ,  A61B2218/008

Abstract: An electrosurgical generator is equipped with a smoke evacuator which becomes active upon acting either on the foot pedal (16) or on the activation button on the hand piece (32). Evacuation however only takes place when the suction motor (29a) is activated by a trigger device (14) via other components (25, 37, 27) whenever HF current begins to flow. The rate of suction is determined by a smoke detector (42) placed on the smoke passage (30). A similar system can be used for total or partial removal of liquids from the operation site.

Abstract translation: 电外科发生器配备有排烟器，其在作用在脚踏板（16）上或者在手部件（32）上的启动按钮上起作用。 然而，仅当HF电流开始流动时，仅通过其他部件（25,37,27）由触发装置（14）激活抽吸马达（29a）才发生抽空。 抽吸速率由放置在烟道（30）上的烟雾探测器（42）确定。 类似的系统可用于从操作现场全部或部分去除液体。

公开(公告)号：WO1995020360A1

公开(公告)日：1995-08-03

申请号：PCT/IB1994000424

申请日：1994-12-14

Applicant: VALLEYLAB, INC.

Inventor： VALLEYLAB, INC. ,  SILVESTRINI, Thomas, A.

IPC: A61B17/39

CPC classification number: A61B18/1492 ,  A61B18/1402 ,  A61B18/1482 ,  A61B18/1485 ,  A61B2018/00196

Abstract: Disclosed herein is a telescoping bipolar electrode (1) having an inner electrode (4) with an outer diameter (D4), length and outer side surface, such that up to the entire side surface is covered with an insulation sheath (5), which alternatively is fixed to the inner electrode (4) or is lengthwise adjustable with respect thereto, the inner electrode (4) and insulation sheath (5) together being slidably mounted within the inner space of an outer electrode (2) having an inner diameter greater than that of the inner electrode and its insulation sheath, an outer diameter (D2), thickness, length and an outer side surface area, the outer electrode (2) also having an insulation sheath (3) around its outer diameter (D2), covering up to the entire side surface area of the outer electrode (2), with the insulation sheath (3) around the outer electrode (2) being alternatively fixed to the outer electrode (2) or lengthwise adjustable with respect thereto. The bipolar electrode (1) is capable of being inserted into the human body through a body cavity or through the lumen of a vessel. At least one of the outer and inner electrodes is supplied with radio frequency energy from an external source (10). The bipolar electrode (1) is utilized to cut, desiccate or ablate neoplasms (12) in the body. In an alternative embodiment, the bipolar electrode (1) is configured such that the two component electrodes (2, 4) are arranged externally parallel to one another and are telescopically slidable relative to one another.

Abstract translation: 本文公开了一种伸缩式双极电极（1），其具有内部电极（4），其具有外径（D4），长度和外侧表面，使得整个侧表面被绝缘护套（5）覆盖， 内部电极（4）和绝缘护套（5）一起可滑动地安装在外部电极（2）的内部空间内，内部电极（2）的内径较大 内部电极及其绝缘护套的外径（D2），厚度，长度和外侧表面区域，外部电极（2）也具有围绕其外径（D2）的绝缘护套（3） 覆盖外部电极（2）的整个侧表面区域，其中围绕外部电极（2）的绝缘护套（3）交替地固定到外部电极（2）或者相对于外部电极（2）纵向可调节。 双极电极（1）能够通过体腔或通过血管的内腔插入人体内。 从外部源（10）向外部和内部电极中的至少一个提供射频能量。 双极电极（1）用于切割，干燥或消融体内的赘生物（12）。 在替代实施例中，双极电极（1）被配置为使得两个部件电极（2,4）彼此外侧平行布置并且可相对于彼此可伸缩地滑动。

公开(公告)号：WO1995009577A1

公开(公告)日：1995-04-13

申请号：PCT/IB1994000273

申请日：1994-09-09

Applicant: VALLEYLAB, INC.

Inventor： VALLEYLAB, INC. ,  KLICEK, Michael, S.

IPC: A61B17/39

CPC classification number: A61B18/1206 ,  A61B2018/00702 ,  A61B2018/00755 ,  A61B2018/00761 ,  A61B2018/00779 ,  A61B2018/00827 ,  A61B2018/00875 ,  A61B2018/00892

Abstract: An electrosurgical generator (11) control responds to tissue impedance between active and return electrodes (12 and 13) during desiccation. Active and return generator leads supply energy (25) and a user control (16) sets the level of energy (25) desired for electrosurgery. Voltage and current sensing circuits (19) respond to high frequency energy (25) in the leads to signal voltage and current in the leads. A multiplier (21) receives the signals to calculate power. A clock (23) sets units of time during which power calculation. An integrator (24) calculates the energy (25) supplied through the leads per time unit. The user control (16) sets a reference signal (26) for the energy (25) level desired. A correlation circuit (27) receives the energy (30) calculations from the integrator (24) and the reference signal (26) and provides a feedback signal (28) to indicate when the energy (25) calculation equals the user control (16) setting for altering the generator supply of energy (25) to the leads. A counter (38) assesses the number of packets of energy (40) delivered against a setting of the user control (16) and the total energy (25) delivered is a function of multiple packet sequences containing pulses wherein the time between the pulses is controlled by the user control (16). The method uses the automatic control (10) in measuring impedance during tissue desiccation and altering the output of an electrosurgical generator (11).

Abstract translation: 电外科发生器（11）控制在干燥期间响应于主动和返回电极（12和13）之间的组织阻抗。 主动和返回发电机引导供电能量（25），用户控制（16）设置电外科所需的能量水平（25）。 电压和电流检测电路（19）对引线中的高频能量（25）作出响应，以引发引线中的电压和电流。 乘法器（21）接收信号以计算功率。 时钟（23）设定功率计算的时间单位。 积分器（24）计算每个时间单位通过引线提供的能量（25）。 用户控制（16）为所需的能量（25）设定参考信号（26）。 相关电路（27）从积分器（24）和参考信号（26）接收能量（30）的计算，并提供反馈信号（28）以指示能量（25）的计算何时等于用户控制（16） 用于将发电机能量供应（25）改变为引线的设置。 计数器（38）根据用户控制（16）的设置来评估递送的能量分组的数量（40），并且传送的总能量（25）是包含脉冲的多个分组序列的函数，其中脉冲之间的时间是 由用户控制（16）控制。 该方法使用自动控制（10）在组织干燥期间测量阻抗并改变电外科发生器（11）的输出。

公开(公告)号：WO1995003743A1

公开(公告)日：1995-02-09

申请号：PCT/IB1994000081

申请日：1994-04-26

Applicant: VALLEYLAB, INC.

Inventor： VALLEYLAB, INC. ,  KLICEK, Michael, S. ,  PATERSON, William, G.

IPC: A61B17/39

CPC classification number: A61B18/1206 ,  A61B18/12 ,  A61B18/1233 ,  A61B2018/00083 ,  A61B2018/0075

Abstract: An apparatus (10) and method to find leakage due to tissue load or transients at the start or end of electrosurgery. Active and return electrodes (11 and 16) between a patient and an ESU (13) pass RF energy sensed by inductive transformers (17 and 19). A circuit finds leakage at more than two thousand times per second; that frequency depends on the phase shift (23) between voltage and current. Software and feedback (26) manage RMS voltage to reduce the peak voltage of the output wave or increase the crest factor by pulse width modulation of the RF drive. Phase shift (23) changes of the active and return current signals (18 and 20) and peak voltage and current are found. The phase angle theta is compared to a threshold and if greater than the frequency at which the differences (22) between the active and return current signals (18 and 20) are examined is increased. The differences (22) between the active and return current signals (18 and 20) are examined and if greater than a maximum for leakage while the mode selected is in coagulation then the pulse width of the RF drive is reduced to hold voltage wave-form peaks at a predetermined value while the RMS voltage is reduced to lower the leakage to a maximum or the frequency at which the leakage current is calculated is held to a maximum level until the phase angle theta is smaller than the threshold. If the difference (22) is greater than a maximum for leakage while the mode is cut or bipolar then the Vrms is reduced to a maximum level or the level remains high until the phase angle theta is smaller than a threshold. The crest factor is increased by reducing the duty cycle or the pulse width of the output wave shape.

Abstract translation: 一种在电外科手术开始或结束时发现由于组织负荷或瞬变引起的渗漏的装置（10）和方法。 患者和ESU（13）之间的有源和返回电极（11和16）传递由感应变压器（17和19）感测的RF能量。 电路每秒发现二千多次泄漏; 该频率取决于电压和电流之间的相移（23）。 软件和反馈（26）管理RMS电压以降低输出波的峰值电压或通过RF驱动器的脉宽调制增加波峰因数。 发现有源和回流电流信号（18和20）和峰值电压和电流的相移（23）变化。 将相位角θ与阈值进行比较，并且如果大于检查有效和返回电流信号（18和20）之间的差（22）的频率增加。 检查有源和回流电流信号（18和20）之间的差异（22），并且如果在选择的模式处于凝结状态时大于泄漏的最大值，则RF驱动器的脉冲宽度被减小以保持电压波形 峰值处于预定值，同时RMS电压降低以将泄漏降低到最大值或将泄漏电流计算出的频率保持在最大电平，直到相位角θ小于阈值。 如果在模式被切断或双极时差（22）大于泄漏的最大值，则Vrms被减小到最大电平，或者水平保持高，直到相位角θ小于阈值。 通过减小输出波形的占空比或脉冲宽度来增加波峰因数。

公开(公告)号：WO1994023659A1

公开(公告)日：1994-10-27

申请号：PCT/IB1994000057

申请日：1994-04-06

Applicant: VALLEYLAB, INC.

Inventor： VALLEYLAB, INC. ,  KLICEK, Michael, S. ,  PATERSON, William, G.

IPC: A61B17/39

CPC classification number: A61B18/1206 ,  A61B18/1233 ,  A61B2018/00666 ,  A61B2018/00678 ,  A61B2018/00702 ,  A61B2018/00708 ,  A61B2018/00875

Abstract: A circuit, for monitoring and controlling parameters of an electrosurgical unit (10), ESU, relative to load and the RF energy, has a load responsive output sensing circuit (11) that measures the ESU load. A signal modifier (12) attached to the sensing circuit (11) enhances the signals measured and transmits them to a buffer (13). An analog to digital converter (18), A/D, digitizes the signals and samples wave pulse train at about eight million samples per second. A data memory (21) stores the digitized signals. An RF drive clock (27) connects to the ESU output; a sample clock (19) uses phase shifting to interrogate the input signals to a processor (20), DSP, at a greater sampling rate of frequency than without. The DSP receives the stored signals from the data memory (21) and processes them while monitoring and calculating ESU parameters measured, i.e. voltage, current, power, load impedance, leakage current, peak to peak voltage, peak to peak current, spectral content and/or crest factor of the RF wave pulse train energy to use as controlling feedback to either a high voltage power supply in the ESU, regulating the RF drive pulses or both. A method monitors and controls the ESU relative to load and has the steps of collecting parameters with the ESU output sensing circuit (11) responsive to loads; enhancing signals with the signal modifier (12); transmitting signals to the buffer (13); converting signals with the A/D converter (18); storing signals in the data memory (21); receiving signals in the DSP, and processing, monitoring and controlling signals by repeatedly measuring ESU output parameters.

Abstract translation: 用于监测和控制电外科单元（10），ESU相对于负载和RF能量的参数的电路具有测量ESU负载的负载响应输出检测电路（11）。 附接到感测电路（11）的信号调节器（12）增强测量的信号并将其发送到缓冲器（13）。 A / D模数转换器（18）对信号进行数字化处理，每秒采样波形脉冲序列约800万个。 数据存储器（21）存储数字化信号。 RF驱动时钟（27）连接到ESU输出; 采样时钟（19）使用相移来以比没有频率更大的采样频率向输入信号询问处理器（20）DSP。 DSP接收来自数据存储器（21）的存储信号，并在监测和计算测量的ESU参数，即电压，电流，功率，负载阻抗，漏电流，峰峰值电压，峰峰值电流，频谱含量和 RF波脉冲串能量的波峰因数用作控制反馈给ESU中的高压电源，调节RF驱动脉冲或两者。 一种方法监测和控制ESU相对于负载，并具有响应于负载与ESU输出检测电路（11）收集参数的步骤; 用信号调节器增强信号（12）; 向所述缓冲器发送信号; 用A / D转换器（18）转换信号; 将信号存储在数据存储器（21）中; 在DSP中接收信号，并通过重复测量ESU输出参数来处理，监控和控制信号。

公开(公告)号：WO1994022378A1

公开(公告)日：1994-10-13

申请号：PCT/US1994000594

申请日：1994-01-28

Applicant: VALLEYLAB, INC.

Inventor： VALLEYLAB, INC. ,  BEATY, Michael, A. ,  JEFFREY-COKER, Bandele ,  OLICHNEY, Michael, D. ,  PAGE, Jon, P. ,  RESCHKE, Arlan, J. ,  ROSE, Emery, S. ,  STODDARD, Robert, B.

IPC: A61B17/00

CPC classification number: A61B17/320068 ,  A61B18/14 ,  A61B2017/320084 ,  A61B2217/005

Abstract: An ultrasonic and electrosurgical handpiece (10) housing (11) has an axis, a distal end (12), a proximal end (13) and a passage (14) defined by an inside wall (40). A piezo stack (26) has elements (16) carried along a plane (17) generally transverse to the axis. A retainer (18) for the elements (16) has distal, intermediate and proximal portions (21). The distal portion (19) has a fastener (22); the proximal portion (21) has a threaded shoulder bolt (24). The stack (26) about the shoulder has an energy input (29) and a reference output (30) positioned axially apart from one another. An insulating sleeve (31) about the bolt is between central openings of the elements (16) and the bolt. A pair of insulators (32) about the bolt has the stack (26) therebetween; one insulator (32) is between the plane (17) and the stack (26) and the other is near the threads. The intermediate portion (20) attaches to the housing (11) at the plane (17) with decoupling and sealing. An irrigation channel (44) conveys fluid. The drive energy input (29), the feedback signal and the reference outputs (30) are insulated by the sleeve (31) and pair from the bolt. A washer (34) against the insulator (32) and about the threads applies axial but not torsion to the insulator (32) when a clamping nut (35) on the threads holds components on the bolt. The clamping nut (35) is in circuit with electrosurgical energy as the reference return for electrosurgery. A tool (36) fastens to a connector (37) for transmitting axial vibrations in the form of a predefined stroke at a tip (38) thereof.

Abstract translation: 超声波和电外科手柄（10）壳体（11）具有轴线，远端（12），近端（13）和由内壁（40）限定的通道（14）。 压电叠层（26）具有沿着大致横向于轴线的平面（17）承载的元件（16）。 用于元件（16）的保持器（18）具有远端，中间和近端部分（21）。 所述远端部分（19）具有紧固件（22）; 近侧部分（21）具有螺纹肩部螺栓（24）。 围绕肩部的叠层（26）具有彼此轴向分开的能量输入（29）和参考输出（30）。 围绕螺栓的绝缘套管（31）在元件（16）的中心开口和螺栓之间。 围绕螺栓的一对绝缘体（32）在其间具有叠层（26）; 一个绝缘体（32）位于平面（17）和堆叠（26）之间，另一个位于螺纹附近。 中间部分（20）通过去耦和密封在平面（17）处附接到壳体（11）。 灌溉通道（44）输送流体。 驱动能量输入（29），反馈信号和参考输出（30）由套筒（31）和螺栓对组成绝缘。 当螺纹上的夹紧螺母（35）保持螺栓上的部件时，抵靠绝缘体（32）并且围绕螺纹的垫圈（34）在螺纹上施加轴向但不扭转到绝缘体（32）。 夹紧螺母（35）以电外科手术电路作为电外科手术的参考回路。 工具（36）紧固到连接器（37），用于在其尖端（38）处以预定行程的形式传递轴向振动。

公开(公告)号：WO1993019681A1

公开(公告)日：1993-10-14

申请号：PCT/US1993000018

申请日：1993-01-11

Applicant: VALLEYLAB, INC.

Inventor： VALLEYLAB, INC. ,  KLICEK, Michael, S.

IPC: A61B17/39

CPC classification number: A61B18/1402

Abstract: An electrosurgical bipolar cutting apparatus comprising a handpiece (1) to which is connected a first active electrode and a second return electrode having exposed distal ends (6, 7) which define a tip for electrosurgically cutting tissue at an operational site on a patient, which tip is structured so that both distal ends simultaneously contact said tissue and wherein the active electrode has a higher tissue to electrode impedance than the return electrode.