EP3220840A1 - Générateur à haute fréquence pour le raccordement d'une sonde destinée à être introduite dans des milieux corporels - Google Patents

Générateur à haute fréquence pour le raccordement d'une sonde destinée à être introduite dans des milieux corporels

Info

Publication number
EP3220840A1
EP3220840A1 EP15797320.7A EP15797320A EP3220840A1 EP 3220840 A1 EP3220840 A1 EP 3220840A1 EP 15797320 A EP15797320 A EP 15797320A EP 3220840 A1 EP3220840 A1 EP 3220840A1
Authority
EP
European Patent Office
Prior art keywords
probe
signal
shaft
electrical
frequency generator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP15797320.7A
Other languages
German (de)
English (en)
Inventor
Hanno Winter
Stefan Schiddel
Dennis Trebbels
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Olympus Winter and Ibe GmbH
Original Assignee
Olympus Winter and Ibe GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Olympus Winter and Ibe GmbH filed Critical Olympus Winter and Ibe GmbH
Publication of EP3220840A1 publication Critical patent/EP3220840A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
    • A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
    • A61B18/1206—Generators therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
    • A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
    • A61B18/14—Probes or electrodes therefor
    • A61B18/1492—Probes or electrodes therefor having a flexible, catheter-like structure, e.g. for heart ablation
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B2017/00017—Electrical control of surgical instruments
    • A61B2017/00022—Sensing or detecting at the treatment site
    • A61B2017/00039—Electric or electromagnetic phenomena other than conductivity, e.g. capacity, inductivity, Hall effect
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00636—Sensing and controlling the application of energy
    • A61B2018/00773—Sensed parameters
    • A61B2018/00779—Power or energy
    • A61B2018/00785—Reflected power
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00636—Sensing and controlling the application of energy
    • A61B2018/00773—Sensed parameters
    • A61B2018/00869—Phase
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
    • A61B90/06—Measuring instruments not otherwise provided for
    • A61B2090/062—Measuring instruments not otherwise provided for penetration depth

Definitions

  • High frequency generator for connecting a probe for insertion in body media
  • the invention relates to a high-frequency generator for connecting a probe for introduction into body media, and a probe and a system comprising a high-frequency generator and a probe.
  • the probe has an elongate shaft with proximal and distal ends and may be inserted distal end first into body media such as body tissue or body fluid.
  • Such probes are basically known and may be provided for and adapted for various purposes, e.g. for the treatment of body tissue by delivering energy to the body tissue, for taking body tissue samples, for introducing fluids or other media or, in the case of a catheter, only for guiding another probe guided in a lumen of the catheter.
  • probes In the use of such probes, it is of great importance that the probe is inserted with the correct length in the body, or introduced at the correct speed and / or pulled out. To indicate the respective insertion length known probes are sometimes provided with length markings. However, the speed of insertion / extraction is only properly controlled by the experience of the user. The invention has for its object to facilitate the use of such probes.
  • a high frequency generator for the connection of a probe for introduction into body media.
  • the probe to be connected has an elongate shaft with a proximal and a distal end and an electrical conductor running along the shaft with an inductive and a capacitive line pad, which determine a respective local characteristic impedance of the electrical conductor.
  • the high-frequency generator has a terminal for a respective probe to be connected to the high-frequency generator, which together with a terminal of a respective probe is designed to feed an electrical signal into the electrical conductor of the probe and to decouple reflected signal components of the electrical signal from the electrical conductor.
  • the high-frequency generator has a measurement signal generator and an evaluation unit, of which the measurement signal generator is designed to generate an electrical measurement signal to be supplied to a probe connected to the high-frequency generator and the evaluation unit is designed to detect signal components of the sensor connected to the high-frequency generator during operation evaluate electrical measurement signal and provide a distance signal identifying the location on the shaft of a probe connected in operation to the radio frequency generator, at which the permittivity of the immediate environment along the shaft changes due to a transition between the media surrounding the shaft.
  • a probe is proposed to achieve the object, which has an elongate shaft with a proximal and a distal end and an electrical conductor extending along the shaft with an inductive and a capacitive Ichsbe lag, which determine a respective local characteristic impedance of the electrical conductor.
  • the probe has a terminal for feeding an electrical signal into the electrical conductor and coupling out reflected signal components of the electrical signal from the electrical conductor.
  • the object is achieved by a system with a probe of the type mentioned and a high-frequency generator of the type mentioned, wherein the probe is connected via the connection to the high-frequency generator, the measuring signal generator is designed to generate an over the connection of the probe to be supplied electrical measurement signal and the evaluation unit is designed to eject reflected signal components of the electrical measurement signal coupled out of the probe via the connection. and to provide a distance signal identifying the location on the shaft where the permittivity of the immediate environment changes along the shaft.
  • Such a high-frequency generator and such a system offer the advantage that a measurement of the penetration depth of a connected probe instead of by means of printed markings or in addition can be done by means of an electrical measurement method.
  • the measurement method is based on the so-called “Time Domain Reflectometry" ("TDR"), in which a high-frequency electrical measurement signal is fed in at the proximal end of the probe (eg in the handle or in the plug) If the conductors are not electrically shielded against the environment, one can influence the electrical conduction properties capacitively, which changes the characteristic impedance of the conduction at the affected points Scope of the case when the probe is inserted in the body The measured signal is partly reflected and only partly transmitted at the points of the line which have a changed characteristic impedance at the entrance of the pipe Voltage profile is detected and evaluated by the electronics in the probe assembly according to the invention by measurement.
  • TDR Time Domain Reflectometry
  • the measuring signal generator of the high-frequency generator is designed to deliver a modulated measuring signal and the evaluation unit preferably contains a phase detector the signal transit time can be precisely determined by phase detection.
  • the high-frequency generator additionally contains a circulator which is arranged and configured to conduct the measurement signal from the measurement signal generator to a probe and to guide signal components reflected in the probe to the evaluation unit.
  • the evaluation unit can be part of a measuring electronics or a CPU module.
  • the evaluation unit of the high-frequency generator is formed
  • Reference reflection signal from reflected signal components of the electrical measurement signal for the probe in air comprising partial reflections by the changes of the characteristic impedance inherent in the probe, the cable and the connection, with a respective current reflection signal from reflected signal components of the electrical measurement signal for the probe in a Compare part in a lumen introduced state, so that the reflection that occurs at the location of the transition from a first to a second material surrounding the shaft, can be identified by the comparison.
  • the reference reflection signal contains partial reflections of the measurement signal, which are caused by the changes in the characteristic impedance inherent in the probe, the cable, the connection and are thus intrinsic to the system, so that the reflection at the location of the transition of air to tissue (when introduced into the body tissue probe) can be identified as a further reflection within a current reflection signal.
  • the measuring signal generator is designed to deliver a high-frequency, optionally additionally modulated, measuring signal.
  • the evaluation unit can additionally be designed with the aid of a change in the location determined by the distance signal to determine a speed of the probe in the longitudinal direction of the shaft.
  • the evaluation unit can be designed to detect the change in a respectively detected location of a reflection of the measurement signal at the transition between the shaft surrounding media over time, in order to determine a speed of the probe in the shaft longitudinal direction in this way.
  • This speed of the probe in the longitudinal direction of the shaft corresponds, for example, to the speed with which the probe is inserted into or pulled out of a body.
  • the high-frequency generator has a control unit.
  • the control unit is designed to control the measuring signal generator as a function of the distance signal, for example by adjusting the amplitude and / or a frequency of the measuring signal. In this way, an electrical measurement signal with a low amplitude can be fed, which can be increased during operation and thus individually adapted to the operation in certain lumens.
  • the high-frequency generator has a user interface.
  • the user interface is designed to optically and / or acoustically present to a user of the high-frequency generator the distance signal delivered by the evaluation unit or a signal derived therefrom.
  • an audio signal may be presented when the elongate shaft of the probe penetrates too deep into a lumen.
  • a predetermined distance value can be entered with the aid of the user interface. If it results from the distance signal that this distance value has been reached, the audio signal is triggered in this case so that it can serve as a warning signal for the user.
  • the evaluation unit can also be designed to detect and evaluate a time profile of the voltages and / or currents resulting from the coupled-out reflected signal components of the electrical measurement signal.
  • the high-frequency generator has a high-frequency generator. This high-frequency power generator is designed to generate an electrical working signal to be supplied via the connection of the probe.
  • the working signal is intended, for example, to supply the energy necessary for cutting or coagulating tissue to the distal end of the shaft.
  • the working signal can be provided parallel to the measuring signal in the electrical conductors of the elongated shaft.
  • the signals are shielded from each other so that they do not interfere with each other.
  • the high frequency generator has a control unit configured to control the high frequency working generator in response to the distance signal, the output of energy to surrounding tissue can be automatically controlled depending on how far the probe is inserted into a body or how fast she is moved in the longitudinal direction.
  • the elongated shaft of the probe be flexible so that it can be inserted, for example, along blood vessels such as veins or other body lumens.
  • the probe preferably has a connecting cable which is electrically connected to the electrical conductor running along the shaft, wherein the electrical conductor and the connecting cable form a waveguide for measuring signals and the characteristic impedance of the along the shaft extending electrical conductor, the connecting cable and the connection between the two are coordinated.
  • This coordination can be such that the characteristic impedance does not change or only insignificantly changes along the connecting cable and the electrical conductor running along the shaft.
  • system-inherent reflections of the measurement signal inherent to the probe can be prevented or reduced so that the reflection due to different electrical characteristics of various media surrounding the probe shaft such as e.g. Air and body tissue or body fluid are not concealed, obscured or masked by systemic reflection.
  • the characteristic impedance of the connecting cable may have a predetermined characteristic impedance difference with respect to the elongate shaft.
  • the electrical conductor may be routed along the shaft at the distal end with an impedance, e.g. be completed in the form of a terminating resistor whose value corresponds to the characteristic impedance of the conductor, so that there is no (partial) reflection of the measuring signal at the distal end of the conductor.
  • an impedance e.g. be completed in the form of a terminating resistor whose value corresponds to the characteristic impedance of the conductor, so that there is no (partial) reflection of the measuring signal at the distal end of the conductor.
  • the electrical conductor at its distal end may also be shorted or open (corresponding to an infinite terminating resistor).
  • the probe has two electrical conductors which are designed to conduct an electrical measurement signal parallel to an electrical operating signal.
  • the probe may include three electrical conductors, two of which are configured to carry an electrical working signal and of which the third electrical conductor is configured to carry an electrical measurement signal.
  • the distance between the respective electrical conductors is at least approximately constant and also the permittivity of an insulating material of the electrical conductors is at least approximately the same over the entire length of the electrical conductors.
  • Further aspects of the invention relate to a method for determining the penetration depth of a probe into a medium having a different permittivity than air.
  • the transit time is determined by comparing a portion of the measurement signal itself as a reference signal with the reflected or partially reflected measurement signal component and determining a time or phase shift between the reference signal and the reflected signal.
  • Fig. 1 a schematic representation of a system according to the invention with a
  • FIG. 2 is a schematic detail view of a distal end of the shaft of FIG.
  • FIG. 1 shows a system 100 which comprises a probe 10 and a high-frequency generator 12, which are electrically connected to one another via a connection cable 14.
  • the probe 10 has a flexible shaft 16 which is adapted to be inserted into body tissue or body lumens.
  • the shaft 16 has a distal end 16.1 and a proximal end 16.2.
  • a handle 18 is provided at the proximal end 16.2 of the shaft.
  • the connecting cable 14 is connected via a plug connection 20 with the high-frequency generator 12.
  • the high-frequency generator 12 comprises a high-frequency power generator 22 which supplies an electrical working signal, which is supplied via the connector 20 and the connecting cable 14 of the probe 10 and can serve, for example, the coagulation or cutting tissue.
  • the probe 10 may have corresponding electrodes (see FIG. 2).
  • the high-frequency generator 12 comprises a measuring signal generator 24, which generates a measuring signal during operation, and which is likewise connected via the plug connection 20 in the connection cable 14 with the probe 10.
  • an evaluation device is provided which comprises a measuring electronics 26 and a CPU module 28. The CPU module 28 generates a distance signal from a signal supplied by the measuring electronics 26 and outputs this to a user interface 30.
  • FIG. 2 shows a schematic detail view of a distal section of the shaft 16.
  • the shaft 16 has a flexible shell 32 and has at its distal end a tip electrode 34 and a ring electrode 36. About the tip electrode 34 and the ring electrode 36 can deliver a high frequency working signal to surrounding body tissue. This high-frequency operating signal is supplied to the electrodes 34 and 36 via an electrical operating signal line 38 and 40, respectively.
  • the working signal lines 38 and 40 are connected via the connecting cable 14 with the high frequency working generator 22. In this way results in a bipolar probe 16, as it is known per se. Also provided are two further electrical conductors 42 and 44 which extend along the shaft 16 and constitute a waveguide for a measurement signal generated by the measurement signal generator 24. This measuring signal can be generated by the measuring signal generator 24 and fed via the connector 20 in the connection cable 14 and the electrical conductors 42 and 44 are supplied via this connecting cable 14. The electrical conductors 42 and 44 are terminated at their distal end with a terminating resistor 46 whose impedance value corresponds to the characteristic impedance of the line formed by the two electrical conductors 42 and 44.
  • the termination resistor 46 causes the measurement signal generated by the measurement signal generator 24 is not reflected at the distal end of the electrical conductors 42 and 44, but there is dissipated in the terminating resistor, so that reflections of the measurement signal occur where the characteristic impedance of the electrical conductors 42 and 44 formed line changes.
  • the system 100 thus comprises a measuring system for determining the penetration depth of the probe in e.g. Twill fabric.
  • the measuring system is integrated in the high-frequency generator 12 and has as components the measuring signal generator 24 and the measuring electronics 26 and the CPU module 28.
  • the measuring signal generator 24 is connected to the conductors in the connecting cable and feeds high-frequency measuring signals into those of the along the shaft 16 extending electrical conductors 42 and 44 formed line.
  • the measuring electronics measures the time profile of the voltage and / or the currents at the line input in the vicinity of the connector 20.
  • the high-frequency measuring signals of the measuring signal generator are evaluated, but not the HF currents of the working signal, which is used to treat the tissue.
  • the measured values e.g.
  • the work generator 22 may be controlled based on the evaluations and / or the user may be acoustically and / or optically informed via the user interface 30.
  • the operating signal from the high-frequency power generator 22 and the measuring signal from the measuring signal generator 24 are conducted via a circulator 50 to the plug connection 20.
  • Signals reflected in the probe 10 are transmitted through the circulator 50 through a notch filter 52 to the Measuring electronics 26 passed.
  • the notch filter 52 filters out unwanted portions of the radio frequency working signal from the reflected signal.
  • a portion of the measurement signal from the measurement signal generator 24 is also passed as a reference signal via an attenuator 54 to the measurement electronics 26. From the time or phase shift between the reference signal and the reflected signal, the measuring electronics 26 determines the penetration depth of the probe 10 into the body of the patient.
  • the connector 20, the connecting cable 14 and the flexible probe 10 form a waveguide for the fed high-frequency measurement signal. It is advantageous if the characteristic characteristic impedances of the individual components are matched to one another, and e.g. at least approximately identical. This allows the best possible signal transmission without disturbing partial reflections. Small changes or deviations of the characteristic impedance are technically manageable, but large differences in the characteristic impedances cause metrological difficulties. However, it may be advantageous to have a defined and targeted difference in the characteristic impedance of the connection cable 14 and the flexible probe 10. As a result, the exact beginning of the probe, in particular the proximal end 16.2 of the shaft 16, can be detected more easily later in the measurement signal during the evaluation.
  • connection cable 14 This possibly also allows a free choice of the length of the connection cable 14 without affecting the evaluation.
  • the measuring signal generator 24 is then designed to feed the high-frequency measuring signal parallel to the working current.
  • the measuring electronics 26 are in turn designed to distinguish the high-frequency measuring signals from the signals of the working current.
  • an additional electrical conductor as a measuring conductor. This then allows a simplified feed and measurement of the high-frequency measurement signal regardless of the working current.
  • Another technical advantage of an additional electrical conductor is the defined electrical termination of this conductor with a known terminating resistor, eg an open conductor end. This simplifies the evaluation of the measurement signal.
  • the characteristic impedance along the line is as constant as possible. This requires a defined and fixed geometry of the ladder.
  • the distance between the conductors 42 and 44 with each other should be as constant as possible. If the distance is not constant, partial reflections occur along the line. These complicate the evaluation of the measurement signal.
  • the measuring effect is due to a change in the characteristic impedance of the electrical conductor 42 or 44 along the shaft 16 of the probe 10 when the shaft 16 is introduced over part of its length into the human body.
  • the tissue surrounding the shaft 16 has a correspondingly high relative permittivity (about 80) due to the high water content. If the conductors 42 and 44 inside the shaft 16 are not electrically shielded from the environment, so no coax cable or the like is provided, then penetrates the electrical stray field of at least one conductor in the surrounding the shaft 16 tissue. Due to the high relative permittivity of the fabric, this increases the capacitive conduction of the conductor 42 or 44. The characteristic impedance changes accordingly.
  • This sudden change in the characteristic impedance causes the injected measuring signal to be at least partially reflected at the location of the change. Due to this fact, the length of the shaft 16 can be determined, which is already in the body. For exact determination of the length component, the signal propagation time between emission of the measurement signal and arrival of the measurement signal reflected at the location of the change of the characteristic impedance is evaluated.
  • the signal transit time can be determined by directly determining a pulse transit time or by phase detection. The latter requires a modulated measurement signal.
  • control unit for controlling the high-frequency power generator 22nd
  • control unit for controlling the measurement signal generator 24th

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  • Health & Medical Sciences (AREA)
  • Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biomedical Technology (AREA)
  • Molecular Biology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Plasma & Fusion (AREA)
  • Physics & Mathematics (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Otolaryngology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Cardiology (AREA)
  • Measurement Of Resistance Or Impedance (AREA)

Abstract

L'invention concerne un générateur à haute fréquence (12) destiné au raccordement d'une sonde (10) destinée à être introduite dans des milieux corporels. La sonde à raccorder (10) comporte une tige allongée (16) pourvue d'extrémités proximale et distale (16.2, 16.1) et d'un conducteur électrique (42, 44) qui s'étend le long de la tige (16) et qui comporte un revêtement conducteur inductif et un revêtement conducteur capacitif qui déterminent une impédance caractéristique locale respective du conducteur électrique (42, 44). Le générateur à haute fréquence (12) comporte une borne qui est destinée à une sonde (10) respective à raccorder au générateur à haute fréquence (12) et qui est configuré, conjointement avec une borne d'une sonde respective (10), pour injecter un signal électrique dans le conducteur électrique de la sonde (10) et extraire des composantes de signal réfléchies du signal électrique provenant du conducteur électrique (42, 44). En outre, le générateur à haute fréquence (12) comprend un générateur de signal de mesure (24) et une unité d'évaluation (28) : le générateur de signal de mesure (24) est configuré pour générer un signal de mesure électrique destiné à être amené à une sonde (10) raccordée en fonctionnement au générateur à haute fréquence (12), et l'unité d'évaluation (28) est configurée pour évaluer des composantes du signal de mesure électrique qui sont réfléchies par la sonde (10) raccordée en fonctionnement au générateur à haute fréquence (12), et pour délivrer un signal de distance qui est indicatif de l'emplacement sur la tige d'une sonde raccordée en fonctionnement au générateur à haute fréquence, auquel la permittivité de l'environnement immédiat le long de la tige est modifiée en réponse à une transition entre les milieux présents autour de la tige d'une sonde (10) raccordée en fonctionnement au générateur à haute fréquence (12).
EP15797320.7A 2014-11-18 2015-11-18 Générateur à haute fréquence pour le raccordement d'une sonde destinée à être introduite dans des milieux corporels Withdrawn EP3220840A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014223558.8A DE102014223558A1 (de) 2014-11-18 2014-11-18 Hochfrequenzgenerator zum Anschluss einer Sonde zum Einführen in Körpermedien
PCT/EP2015/077022 WO2016079207A1 (fr) 2014-11-18 2015-11-18 Générateur à haute fréquence pour le raccordement d'une sonde destinée à être introduite dans des milieux corporels

Publications (1)

Publication Number Publication Date
EP3220840A1 true EP3220840A1 (fr) 2017-09-27

Family

ID=54601781

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15797320.7A Withdrawn EP3220840A1 (fr) 2014-11-18 2015-11-18 Générateur à haute fréquence pour le raccordement d'une sonde destinée à être introduite dans des milieux corporels

Country Status (3)

Country Link
EP (1) EP3220840A1 (fr)
DE (1) DE102014223558A1 (fr)
WO (1) WO2016079207A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016213520A1 (de) 2016-07-22 2018-01-25 Olympus Winter & Ibe Gmbh Elektrochirurgischer Applikator, Generator, und elektrochirurgisches System sowie Verfahren zum Betreiben eines Applikators, eines Generators und/oder eines Systems und Verfahren zum Einführen eines Applikators in ein Körperlumen
CN113288410B (zh) * 2021-07-08 2022-09-30 昆山雷盛医疗科技有限公司 腔体器官射频热消融系统

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5361776A (en) * 1993-08-06 1994-11-08 Telectronics Pacing Systems, Inc. Time domain reflectometer impedance sensor method of use and implantable cardiac stimulator using same
US7137980B2 (en) * 1998-10-23 2006-11-21 Sherwood Services Ag Method and system for controlling output of RF medical generator
US20080039914A1 (en) * 2000-11-24 2008-02-14 Nervonix, Inc. Needle with depth determination capability and method of use
US6603997B2 (en) * 2001-11-02 2003-08-05 Michael C. Doody Probe penetration detector and method of operation
GB0704650D0 (en) * 2007-03-09 2007-04-18 Medical Device Innovations Ltd Tissue classifying apparatus
US8852179B2 (en) * 2008-10-10 2014-10-07 Covidien Lp Apparatus, system and method for monitoring tissue during an electrosurgical procedure
US9375249B2 (en) * 2012-05-11 2016-06-28 Covidien Lp System and method for directing energy to tissue

Also Published As

Publication number Publication date
WO2016079207A1 (fr) 2016-05-26
DE102014223558A1 (de) 2016-05-19

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