WO2002089908A1 - Catheter multi-electrode orientable et son procede - Google Patents

Catheter multi-electrode orientable et son procede Download PDF

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Publication number
WO2002089908A1
WO2002089908A1 PCT/IL2001/000415 IL0100415W WO02089908A1 WO 2002089908 A1 WO2002089908 A1 WO 2002089908A1 IL 0100415 W IL0100415 W IL 0100415W WO 02089908 A1 WO02089908 A1 WO 02089908A1
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WO
WIPO (PCT)
Prior art keywords
distal
electrodes
locating
distal portion
electrical contact
Prior art date
Application number
PCT/IL2001/000415
Other languages
English (en)
Inventor
Pinhas Gilboa
Original Assignee
Super Dimension Ltd.
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 Super Dimension Ltd. filed Critical Super Dimension Ltd.
Priority to PCT/IL2001/000415 priority Critical patent/WO2002089908A1/fr
Publication of WO2002089908A1 publication Critical patent/WO2002089908A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6846—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive
    • A61B5/6847—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive mounted on an invasive device
    • A61B5/6852—Catheters
    • A61B5/6857—Catheters with a distal pigtail shape
    • 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
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
    • A61B5/25—Bioelectric electrodes therefor
    • A61B5/279—Bioelectric electrodes therefor specially adapted for particular uses
    • A61B5/28—Bioelectric electrodes therefor specially adapted for particular uses for electrocardiography [ECG]
    • A61B5/283—Invasive
    • A61B5/287—Holders for multiple electrodes, e.g. electrode catheters for electrophysiological study [EPS]
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6846—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive
    • A61B5/6847—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive mounted on an invasive device
    • A61B5/6852—Catheters
    • A61B5/6853—Catheters with a balloon
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6846—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive
    • A61B5/6885—Monitoring or controlling sensor contact pressure
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/00234—Surgical instruments, devices or methods, e.g. tourniquets for minimally invasive surgery
    • A61B2017/00292—Surgical instruments, devices or methods, e.g. tourniquets for minimally invasive surgery mounted on or guided by flexible, e.g. catheter-like, means
    • A61B2017/003—Steerable
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B2017/00831—Material properties
    • A61B2017/00867—Material properties shape memory 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
    • A61B2018/00571—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body for achieving a particular surgical effect
    • A61B2018/00577—Ablation
    • 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
    • A61B2018/124—Generators therefor switching the output to different electrodes, e.g. sequentially
    • 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
    • A61B2018/1405—Electrodes having a specific shape
    • A61B2018/1407—Loop
    • 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
    • A61B2018/1405—Electrodes having a specific shape
    • A61B2018/1435—Spiral
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/12—Shape memory

Definitions

  • the present invention relates to catheters for performing tissue ablation and, in particular, it concerns a multiple-electrode catheter assembly and a method of using a multiple-electrode catheter assembly.
  • Atrial fibrillation is, in many cases, treated by ablating atrial tissue at a plurality of locations along a line so as to form a closed loop of ablation across the atrium. In other cases, it is treated by ablating the pulmonary vein tissue at a plurality of locations along a line, so as to form a closed loop of ablation across the vein.
  • WO00/ 16684 which is incorporated by reference as if fully set forth herein, teaches how to mark and ablate a series of points of ablation in order to create a continues line of ablation. According to WO00/16684 this is effected by a steerable catheter having a tip adapted to ablate a single point. It is very difficult, however, to achieve sufficient precision to ensure ablation of a contiguous line of tissue using a single electrode catheter. Furthermore, the repeated repositioning of the catheter between successive ablation steps is very time consuming. In an alternative approach to ablation of a line of tissue, a number of multiple-electrode catheters have been proposed to allow successive ablation of multiple sites while the catheter is in a single position.
  • the parameters of the process such as current, voltage, and temperature are monitored at each individual point of ablation, thereby giving an indication of the quality of ablation at each point.
  • the use of a multiple-electrode catheter provides a partial solution to the difficulty in forming a contiguous line of ablation, significant problems are still encountered. Most significantly, it often occurs that one or more of the electrodes is not properly in contact with the endocardium when actuated and, as a result, insufficient ablation occurs. This results in a break in the line of ablation which may cause the entire procedure to fail.
  • the present invention is a multiple-electrode catheter assembly and a method for performing a procedure using such a catheter assembly.
  • a multiple-electrode catheter assembly comprising: (a) a hollow catheter having an internal elongated channel and a flexible distal portion, a plurality of electrodes being spaced along the flexible distal portion; and (b) an inner element slidingly engaged within the elongated channel, the inner element having a steering mechanism configured for selectively deflecting a steerable distal portion of the inner element.
  • the steering mechanism is configured to be selectively operable from an initial curved form so as to tend to straighten the steerable distal portion.
  • the plurality of electrodes is implemented as n electrodes spaced evenly at an interval d along the flexible distal portion, n being at least 3, and wherein a distal end and a proximal end of the steerable distal portion are separated by a length L along the inner element, L being approximately equal to m x d where m is a positive integer less than n, such that the distal end and the proximal end of the steerable distal portion come into simultaneous functional alignment with pairs of the electrodes.
  • m is no more that half of n such that each one of the electrodes is spaced by L from at least one other of the electrodes.
  • the inner element further includes a distal electrical contact located at the distal end of the distal steerable portion and a proximal electrical contact located at the proximal end of the distal steerable portion, the distal and the proximal electrical contacts being configured such that, by moving the inner element along the internal elongated channel, the distal and proximal electrical contacts are selectively brought into alignment for forming an electrical connection with the pairs of the plurality of electrodes.
  • the inner element further includes a distal locating element located at the distal end of the distal steerable portion and a proximal locating element located at the proximal end of the distal steerable portion, the distal and the proximal locating elements forming parts of a location sensing system for determining positions of the distal end and the proximal end, respectively, of the steerable distal portion.
  • a multiple-electrode catheter assembly comprising: (a) a hollow catheter having an internal elongated channel and a hollow distal portion, a plurality of electrodes being spaced along the hollow distal portion; and (b) an inner element slidingly engaged within the elongated channel, the inner element having an actuating distal portion including at least one outwardly facing electrical contact, the electrical contact being configured such that, by moving the inner element along the internal elongated channel, the electrical contact is selectively brought into alignment for forming an electrical connection with each of at least two of the plurality of electrodes.
  • the plurality of electrodes is implemented as n electrodes spaced evenly at an interval d along the flexible distal portion, n being at least 3, and wherein the at least one electrical contact includes a distal electrical contact and a proximal electrical contact separated by a length L along the inner element, L being equal to m x d where m is a positive integer less than n, such that the distal electrical contact and the proximal electrical contact of the actuating distal portion come into simultaneous alignment with pairs of the electrodes.
  • a multiple-electrode catheter assembly comprising: (a) a hollow catheter having an internal elongated channel and a hollow distal portion, a plurality of electrodes being spaced along the hollow distal portion; and (b) an inner element slidingly engaged within the elongated channel, the inner element having a sensing distal portion including at least one locating element, the locating element forming part of a location sensing system for determining a position of at least one point within the inner element, such that, by moving the inner element along the internal elongated channel, the locating element is selectively brought into alignment for determining the position of each of at least two of the plurality of electrodes.
  • the plurality of electrodes is implemented as n electrodes spaced evenly at an interval d along the flexible distal portion, n being at least 3, and wherein the at least one locating element includes a distal locating element and a proximal locating element separated by a length L along the inner element, L being equal to m x d where m is a positive integer less than n, such that the distal locating element and the proximal locating element of the sensing distal portion come into simultaneous alignment with pairs of the electrodes.
  • the at least one locating element forms part of a locating system which determines the position of at least one point in the inner element in three dimensions.
  • the at least one locating element forms part of a locating system which is a non-imaging locating system.
  • the at least one locating element forms part of a locating system which generates coordinates of the position of at least one point relative to a given frame of reference.
  • a method for performing a procedure using a multiple-electrode assembly comprising: (a) providing a hollow catheter having a distal portion with a plurality of independently operable electrodes; (b) deploying a steering mechanism within the hollow catheter so as to be slidable along a length of the distal portion; (c) guiding the catheter to a position in which each of the electrodes lies adjacent to a corresponding region of tissue; (d) sliding the steering mechanism along the distal portion to a first position and actuating the steering mechanism so as to ensure effective contact of at least a first of the electrodes with the corresponding region of tissue during operation of the first electrode; and (e) sliding the steering mechanism along the distal portion to a second position and actuating the steering mechanism so as to ensure effective contact of at least a second of the electrodes with the corresponding region of tissue during operation of the second electrode.
  • the catheter assumes a curved configuration when in the position in which each of the electrodes lies adjacent to a corresponding region of tissue, and wherein the steering mechanism is actuated so as to tend to straighten a selected part of the distal portion.
  • FIG. 1A is a schematic side view of a preferred implementation of a multiple-electrode catheter assembly, constructed and operative according to the teachings of the present invention
  • FIG. IB is an enlarged cross-sectional view taken through a distal portion of the catheter assembly of Figure 1A;
  • FIGS. 2A-2F are a sequence of schematic cross-sectional views showing steps of a procedure performed using the catheter assembly of Figures 1A and IB;
  • FIG. 3 is a schematic enlargement of part of Figure 2F illustrating the use of a steering mechanism of the catheter assembly to ensure effective contact of electrodes with adjacent tissue during operation;
  • FIGS. 4A and 4B are schematic cross-sectional views taken through a variant implementation of the catheter assembly of Figures 1A and IB in a deployed state and a retracted state, respectively. DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • the present invention is a multiple-electrode catheter assembly and a method for performing a procedure using such a catheter assembly.
  • FIGS. 1 A and IB show a multiple-electrode catheter assembly, generally designated 10, constructed and operative according to the teachings of the present invention.
  • catheter assembly 10 includes a hollow catheter 12 with a flexible distal portion 16. The portion of catheter 12 proximal to distal portion 16 is generally standard and is shown here only schematically.
  • Catheter 12 has an internal elongated channel 14 extending along substantially its entire length, best seen in Figure IB.
  • a plurality of electrodes 18 are spaced along distal portion 16.
  • An inner element 20, slidingly engaged within elongated channel 14, has a steering mechanism, shown here as actuated by a steering wire 22, configured for selectively deflecting a steerable distal portion 24 of inner element 20.
  • the steering mechanism may be sequentially positioned and actuated in order to ensure that one or more electrodes at a time are in effective contact with the adjacent tissue prior to operation of those electrodes, thereby making it possible to reduce or eliminate instances of incomplete ablation.
  • This and other advantages of the present invention will become clearer from the subsequent description. Parenthetically, it should be noted that, although described primarily in the preferred context of an ablation catheter, the various aspects of the present invention may be used to advantage additionally, or alternatively, for sensing functions, providing sensing at a series of sites spaced along a line which may be useful for mapping and other diagnostic techniques.
  • sensing functions may be performed using the same structure, or a similar structure with minor adaptations self-evident to one ordinarily skilled in the art, as is used for ablation procedures.
  • operation of an electrode is used herein in the description and claims to refer generically to operation as a sensor, operation as an ablating electrode by supply of suitable RF power, and any other mode of operation of an electrode.
  • the steering mechanism is preferably configured to be selectively operable from an initial curved form so as to tend to straighten the steerable distal portion.
  • the steering mechanism preferably has the capability of providing a straightening force when bent "backwards", i.e., against the direction of curvature normally induced by actuation of the steering mechanism.
  • a steering mechanism of the type illustrated in Figure IB where steering is achieved by pulling on a steering wire 22, this is achieved by localizing the wire along one side of the inner element. In the example illustrated in Figure IB, this is done by locating steering wire 22 within a lumen 26 extending along steerable distal portion 24.
  • steering wire 22 passes along the catheter within a central region of inner element 20, typically confined within a compression coil, as is well known in the art.
  • the length L of the operative portion of the steering mechanism corresponds to the spacing between pairs of electrodes.
  • L is preferably approximately equal to m x d where m is a positive integer less than n, such that the distal end and the proximal end of the steerable distal portion come into simultaneous functional alignment with pairs of the electrodes.
  • m is no more that half of n such that each one of the electrodes is spaced by L from at least one other of the electrodes.
  • inner element 20 can assume five indexing position in which the proximal and distal ends of distal steerable portion 24 are each functionally aligned with one electrode, thereby defining five pairs of electrodes.
  • the catheter assembly may often be implemented with significantly more numerous electrodes than are shown here.
  • inner element 20 preferably further includes at least one, and preferably two, outwardly facing electrical contacts 28.
  • Each electrical contact 28 is configured such that, by moving inner element 20 along channel 14, electrical contact 28 is selectively brought into alignment for forming an electrical connection with one of a number of different electrodes 18. This allows a single electrical connecting wire 30 for each contact to be used to operate a sequence of different electrodes 18, thereby greatly reducing the complexity of electrical wiring required and consequently reducing the unit cost of the catheter assembly.
  • electrical contacts 28 may be implemented in various different forms. Most simply, the contacts may be provided by spring contacts permanently biased outwards towards internal contact surfaces of electrodes 18. Alternatively, a deployment mechanism, such as for example an inflatable balloon actuator (not shown), may be used to selectively displace the contacts outwards when required and allow retraction of the electrodes prior to adjusting the position of the inner element 20. These and other implementations are within the capabilities of one ordinarily skilled in the art. Where more than one electrical contact 28 is used, the spacing between the contacts is preferably equal to an integer multiple of the electrode spacing d to allow operation of more than one electrode while inner element 20 remains in one position. Preferably, electrical contacts 28 are aligned with one, or most preferably both, ends of steerable distal portion 24, thereby inherently ensuring that the electrodes to be operated are the same electrodes with which the steering mechanism is aligned to ensure tissue contact.
  • inner element preferably also includes at least one locating element 32 forming part of a location sensing system for determining a position of at least one point in inner element 20.
  • Locating element 32 is either a transmitting element or a receiving element electrically connected by a sensor connection wire 34 extending along the length of inner element 20.
  • the location sensing system is preferably a system which provides accurate position information in at least three dimensions, and most preferably in six dimensions. The system preferably generates coordinates in a coordinate frame which is reproducibly related to the body position of the subject.
  • the location sensing system is preferably a non-imaging system, i.e., which operates without requiring simultaneous activation of any imaging device.
  • a most preferred implementation of the invention employs a location sensing system as described in co-assigned PCT Publications Nos. WO00/16684 or WO00/10456 which are incorporated by reference herein.
  • a locating element 32 When used in combination with the slidable steering mechanism, a locating element 32 is preferably located at one, and most preferably both, ends of steerable distal portion 24, thereby inherently ensuring that the locating elements sense the position of the electrodes which the steering mechanism is aligned to ensure tissue contact. Similarly, when used in combination with the slidable contacts, a locating element 32 is preferably located adjacent to each electrical contact 28, thereby inherently ensuring that the locating elements sense the position of the electrodes to be operated.
  • slidable locating elements 32 which are selectively brought adjacent to electrodes prior to operation of those electrodes offers significant advantages. Firstly, precise location information is available for each electrode such that, in the event of an ineffective ablation (as identified by monitoring parameters of the process, such as current, voltage, and temperature), a single tip probe may subsequently be brought accurately to the problematic site. This allows a single-electrode steerable ablation catheter to be brought precisely to the point in the line at which incomplete ablation occurred and to perform a supplementary ablation step in order to complete the desired line of treatment. At the same time, the number of locating elements required, as well as the complexity of the wiring, is greatly reduced, thereby rendering the catheter assembly highly cost effective.
  • Figures 2A-2F illustrate a sequence of steps through which the catheter assembly is guided to a position in which each of the electrodes lies adjacent to a corresponding region of tissue, in this case, forming a ring around the left atrium.
  • an external guide sheath 40 is first navigated to the left atrium. This is typically achieved by entering the right atrium via the IVC and piercing the septum by use of a needle 42 (Figure 2A). The needle 42 is then withdrawn and sheath 40 is advanced into the left atrium ( Figure 2B). Catheter assembly 10 is then introduced through sheath 40 ( Figure 2C) and is flexed, typically by operation of the steering mechanism of inner element 20, so that the distal extremity of hollow catheter 12 lies near the point of introduction into the atrium. The steering mechanism is then released as the catheter is advanced, thereby gradually deploying distal portion 16 along a line around the internal tissue surface of the atrium ( Figures 2E and 2F).
  • the steering mechanism is rotated, preferably by rotating inner element 20 while holding hollow catheter 12 still so as not to disturb the catheter positioning, so that steering wire 22 extends along the outside of the curve of distal portion as shown in Figure 3.
  • tension applied to steering wire 22 tends to straighten steerable distal portion 24, thereby tending to push outwards electrodes 18 adjacent to the ends of steerable distal portion 24.
  • the inner element 20 is slid to a sequence of positions and actuated so as to each time ensure effective contact of one, or preferably a pair, of electrodes 18 with the corresponding region of tissue during operation.
  • Figure 4A shows a variant implementation of the present invention in which hollow catheter 12' is implemented with a shape memory configured to facilitate positioning for performing an ablation procedure requiring a line of a particular predefined shape, for instance a circular ablation around the pulmonary vein ostium.
  • Figure 4B shows the same catheter withdrawn in a straight configuration within a sheath 40 ready for deployment.

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Abstract

L'invention concerne un ensemble cathéter (10) à plusieurs électrodes comprenant un cathéter creux (12) doté d'un canal allongé (14) interne et une partie distale (16) souple. Un élément intérieur (20) coopérant par coulissement dans ledit canal allongé (14) possède un mécanisme d'orientation (22) configuré de façon à dévier sélectivement une partie distale (24) orientable de l'élément intérieur (20). En fonction de caractéristiques supplémentaires ou alternatives, ledit élément intérieur (20) comprend des contacts de coulissement (28) destinés à former des connexions électriques avec les électrodes (18), et des éléments de localisation (32) mobiles permettant de déterminer la position d'une électrode (18) pendant une opération. L'invention concerne également un procédé d'utilisation de ce cathéter.
PCT/IL2001/000415 2001-05-10 2001-05-10 Catheter multi-electrode orientable et son procede WO2002089908A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/IL2001/000415 WO2002089908A1 (fr) 2001-05-10 2001-05-10 Catheter multi-electrode orientable et son procede

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Application Number Priority Date Filing Date Title
PCT/IL2001/000415 WO2002089908A1 (fr) 2001-05-10 2001-05-10 Catheter multi-electrode orientable et son procede

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7957789B2 (en) 2005-12-30 2011-06-07 Medtronic, Inc. Therapy delivery system including a navigation element
US8834464B2 (en) 1999-04-05 2014-09-16 Mark T. Stewart Ablation catheters and associated systems and methods
US8888773B2 (en) 2012-05-11 2014-11-18 Medtronic Ardian Luxembourg S.A.R.L. Multi-electrode catheter assemblies for renal neuromodulation and associated systems and methods
US8934978B2 (en) 2002-04-08 2015-01-13 Medtronic Ardian Luxembourg S.A.R.L. Methods and apparatus for renal neuromodulation
US8956352B2 (en) 2010-10-25 2015-02-17 Medtronic Ardian Luxembourg S.A.R.L. Catheter apparatuses having multi-electrode arrays for renal neuromodulation and associated systems and methods
US9084610B2 (en) 2010-10-21 2015-07-21 Medtronic Ardian Luxembourg S.A.R.L. Catheter apparatuses, systems, and methods for renal neuromodulation
US9095321B2 (en) 2012-11-21 2015-08-04 Medtronic Ardian Luxembourg S.A.R.L. Cryotherapeutic devices having integral multi-helical balloons and methods of making the same
US9179974B2 (en) 2013-03-15 2015-11-10 Medtronic Ardian Luxembourg S.A.R.L. Helical push wire electrode
US9707035B2 (en) 2002-04-08 2017-07-18 Medtronic Ardian Luxembourg S.A.R.L. Methods for catheter-based renal neuromodulation
US10166069B2 (en) 2014-01-27 2019-01-01 Medtronic Ardian Luxembourg S.A.R.L. Neuromodulation catheters having jacketed neuromodulation elements and related devices, systems, and methods
US10188829B2 (en) 2012-10-22 2019-01-29 Medtronic Ardian Luxembourg S.A.R.L. Catheters with enhanced flexibility and associated devices, systems, and methods
US10548663B2 (en) 2013-05-18 2020-02-04 Medtronic Ardian Luxembourg S.A.R.L. Neuromodulation catheters with shafts for enhanced flexibility and control and associated devices, systems, and methods
US10736690B2 (en) 2014-04-24 2020-08-11 Medtronic Ardian Luxembourg S.A.R.L. Neuromodulation catheters and associated systems and methods
US11213678B2 (en) 2013-09-09 2022-01-04 Medtronic Ardian Luxembourg S.A.R.L. Method of manufacturing a medical device for neuromodulation

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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US11147948B2 (en) 2012-10-22 2021-10-19 Medtronic Ardian Luxembourg S.A.R.L. Catheters with enhanced flexibility and associated devices, systems, and methods
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US10792098B2 (en) 2013-03-15 2020-10-06 Medtronic Ardian Luxembourg S.A.R.L. Helical push wire electrode
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