WO1993020893A1 - Systeme d'antennes coaxiales orientables pour l'ablation cardiaque - Google Patents
Systeme d'antennes coaxiales orientables pour l'ablation cardiaque Download PDFInfo
- Publication number
- WO1993020893A1 WO1993020893A1 PCT/US1993/003429 US9303429W WO9320893A1 WO 1993020893 A1 WO1993020893 A1 WO 1993020893A1 US 9303429 W US9303429 W US 9303429W WO 9320893 A1 WO9320893 A1 WO 9320893A1
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- WIPO (PCT)
- Prior art keywords
- region
- center support
- support wire
- wire
- cable
- Prior art date
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
- A61M25/0105—Steering means as part of the catheter or advancing means; Markers for positioning
- A61M25/0133—Tip steering devices
- A61M25/0144—Tip steering devices having flexible regions as a result of inner reinforcement means, e.g. struts or rods
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/22—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for
-
- 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
- A61B18/18—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves
-
- 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
- A61B18/18—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves
- A61B18/1815—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves using microwaves
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
- A61M25/0105—Steering means as part of the catheter or advancing means; Markers for positioning
- A61M25/0133—Tip steering devices
- A61M25/0147—Tip steering devices with movable mechanical means, e.g. pull wires
-
- 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
- A61B18/18—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves
- A61B18/1815—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves using microwaves
- A61B2018/1861—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves using microwaves with an instrument inserted into a body lumen or cavity, e.g. a catheter
Definitions
- the invention generally relates to cardiac ablation catheters and systems.
- the invention relates to catheters that use microwave energy to ablate ventricular and atrial tachycardia foci for the treatment and control of car ⁇ diac arrhythmias.
- Background of the Invention Physicians make use of catheters today in medical procedures to gain access into interior regions of the body to ablate tissue areas. It is important for the physician to be able to accurately steer the catheter to the ablation site. Once at the site, it is important for the physician to control the emission of energy within the body used to ablate the tissue.
- SUBSTITUTESHEET procedures that ablate tissue within the heart. These procedures, called electrophysiology therapy, are becoming increasingly more widespread for treating cardiac rhythm disturbances, called arrhythmias.
- a physician steers a catheter through a main vein or artery (which is typically the femoral artery) into the interior region of the heart that is to be treated.
- the physician then further manipulates a steering mechanism to place the electrode carried on the distal tip of the cathe ⁇ ter into direct contact with the tissue that is to be ablated.
- the physician directs radio frequency (RF) energy from the electrode tip through the tissue to an indifferent electrode to ablate the tissue and form a lesion.
- RF radio frequency
- the inventions provide improved cardiac ab ⁇ lation systems and methods using coaxial antenna sys- terns.
- the improved systems and methods offer a coaxi ⁇ al antenna assembly for catheters that can be easily steered and maneuvered within critical regions of the body, like the confines of the heart.
- the antenna assembly comprises a coaxial cable having a proximal region for connection to a source of energy and a distal region for propagating the energy.
- the coaxial cable also has an intermediate region between the distal and proximal regions that has a greater degree of flexibility than the proximal region.
- the assembly includes a steering mechanism that is connected directly to the intermediate region of the coaxial cable.
- the mechanism extends from there to an actuator located at the proximal region of the coaxial cable.
- the actuator is operative by the user to bend the intermediate region and, with it, the distal energy propagation region of the coaxial cable-.
- Fig. 1 is a perspective view of a catheter having a steerable coaxial antenna assembly that e -
- Fig. 2 is a top section view, taken along line 2-2 in Fig. 1, of the interior of the handle as ⁇ sociated with the catheter;
- Fig. 3 is an exploded enlarged perspective view of the steering mechanism associated with the catheter;
- Fig. 4 is a view of the three functional regions of the coaxial cable associated with the cath- eter;
- Figs. 5 to 13 show the steps involved in making the catheter shown in Fig. 1;
- Fig. 14 is an alternative embodiment of a steerable coaxial antenna assembly that embodies the features of the invention.
- Figs. 15A and 15B said figures being col ⁇ lectively referred to hereinafter as Fig. 15 are a coaxial antenna assembly that includes a mechanism for absorbing heat along the coaxial cable that embodies the features of the invention.
- Fig. 16 is an enlarged view of the heat ab ⁇ sorbing mechanism shown in Fig. 15. Description of the Preferred Embodiments
- Fig. 1 shows a steerable microwave ablation catheter 10 that embodies the features of the invent ⁇ ion.
- the catheter 10 includes four main parts: a han ⁇ dle 12, a guide tube 14, and a steerable coaxial an ⁇ tenna assembly 16. In use, the catheter 10 provides electrophysiology therapy in the interior regions of the heart.
- a physician grips the handle 12 and maneuvers the guide tube 14 through a main vein or artery (which is typically the femoral arterial) into the interior region of the heart that is to be treated. The physician then fur-
- SUBSTITUTESHEET ther steers the coaxial antenna assembly 16 to place it in contact with the tissue that is to be ablated.
- the physician directs energy to the antenna assembly 16 to ablate the tissue contacted.
- the handle 12 encloses a rotating cam wheel 22, which forms a portion of the steering mechanism for the antenna assembly 16.
- An associated external steering lever 20 (see Fig. 1) rotates the cam wheel 22 to the left and to the right.
- the cam wheel 22 carries a wire fastener 18.
- the wire fastener 18 holds the proximal ends of right and left catheter steering wires 24 and 26, which are soldered or glued to the interior of the fastener 18.
- the steering wires 24 and 26 extend from the opposite ends of the fastener 18 and along the associated left and right side surfaces of the cam wheel 22.
- the steering wires 24 and 26 extend through interior bore of a tension screw 28 and into the proximal end 30 of the guide tube 14.
- the guide tube 14 is a flexible shaft at ⁇ tached to the handle 12. While it can be variously constructed, in the illustrated embodiment, the guide tube 14 is a length of stainless steel coiled into a flexible spring enclosing an interior bore.
- a braided sheath 32 of plastic material encloses the guide tube 14.
- the steering wires 24 and 26 pass through the in ⁇ terior bore, which leads to the antenna assembly 16.
- the steering mechanism for the antenna assembly 16 also includes a bendable main support wire 34.
- the main support wire 34 is made of stainless steel flat wire stock in an elongated shape about .035 inch wide and about .005 inch thick.
- the main support wire 34 is about 3 inches in total length.
- two leaf springs 36 sandwich the
- Each leaf spring 36 is made of stainless steel flat wire stock in an elongated shape that is about .039 inch wide and about .0029 inch thick. The opposite ends of the main support wire
- stepped shoulders 38 and 40 are cut away to form stepped shoulders 38 and 40.
- the shoulders 38 and 40 are about .024 inch wide and aligned along the center- line of the main support wire 34.
- Each shoulder 38 and 40 is about .12 inch in length.
- one stepped shoulder 38 is attached to the distal end 42 of the guide tube 14.
- a sleeve assembly 44 encloses and reinforces the junc ⁇ tion of the guide tube end 42 and the main support wire 34.
- the sleeve assembly 44 terminates well short of the stepped shoulder 40, leaving it exposed for attachment of the distal ends of the right and left steering wires 24 and 26.
- the left and right steering wires 24 and 26 are ultimately attached, respectively, to the right and left sides of the stepped shoulder 40.
- the antenna assembly 16 includes an antenna 46 (see Fig. 13) and an associated coaxial cable 48.
- the proximal end of the cable 48 extends from within the handle 12 (as Fig. 2 shows) , along the outside of the guide tube 14 within the sheath 32.
- a plug 50 joined to the proximal end of the cable 48 extends outside the handle 12. The plug 50 connects the cable 48 to a source of energy.
- the cable 46 conducts this energy to the antenna 46 for propagation at the lesion site.
- the coaxial cable 48 includes three, functionally dif ⁇ ferent regions 52, 54, and 56.
- the first region 52 constitutes the majority
- SUBSTITUTE SHEET of the coaxial cable 48 It is enclosed within an outer insulation sheath 58 and runs along the outside of the guide tube 14, as previously described.
- the sheath 58 has an outer diam- eter of about .06 inch.
- the second region 54 begins near the junc ⁇ tion of the main support wire 34 with the guide tube 14.
- the outer sheath 58 is absent, leaving a metallic mesh shield 60 that sur- rounds the core cable wire 62.
- the mesh shield 60 has an outer diameter of about .054 inch.
- the steering mechanism for the antenna as ⁇ sembly 16 is ultimately attached to the flexible sec ⁇ ond region 54 of the coaxial cable 48.
- the third region 56 occupies the distal end of the cable 48. Here, there is no surrounding sheath or shield, leaving the core conductor 62 of the cable 48 exposed.
- the core con ⁇ ductor 62 is silver coated copper having an outer di- ameter of about .018 inch and a length of about .75 inch.
- the third region 56 ultimately functions as or as part of the antenna 46.
- Figs. 5 to 13 show the steps in a preferred method of assembling the steerable coaxial antenna assembly 16 just generally described.
- the practitioner shapes the antenna 46.
- the antenna 46 is helical is shape, but other shapes can be selected. In this arrangement, the practitioner uses
- the mandrel 64 includes a threaded end 66.
- the threaded end 66 has the radius and pitch required to create an antenna that will propagate the desired ra- diation heating patterns at the operating frequency selected.
- the threaded mandrel end 66 forms a helical configuration having an internal diameter of about 0.56 inch; an outer diame- ter of about .104 inch; and a pitch of about 24 turns to the inch.
- the practitioner passes a length of antenna wire 68 through an opening 70 to secure it to the man ⁇ drel 64.
- Various types of antenna wire can be used. In the illustrated embodiment, 5% silver coated copper wire having an outer diameter of about .023 inch is used.
- the practitioner winds the wire 68 tightly about the threaded mandrel end 66, forming it into the helix shape. Once formed, the practitioner unscrews the helix antenna 46 from the mandrel.
- the practitioner cuts the antenna 46 to the desired length. In the illustrated embodiment, the desired length is 10 turns.
- the operating frequencies of the antenna so made is either about 915 MHz or 2450 Mhz.
- the antenna 46 has a forward end 72 and a rearward end 74.
- the practitioner preferably uses a deburring tool to remove the silver on the rearward antenna end 74. This deburring exposes the inner copper core of the antenna 46.
- the practitioner forms the three regions 52, 54, and 56 in the cable 48.
- the practitioner first strips away 1.1 inch of the outer shield 58 from the end of
- This exposed shield 60 is next tinned with solder (as Fig. 6B shows) .
- solder Various solder coatings can be used. In the illustrated embodiment, a 95% tin/5% silver solder mix is used.
- the practitioner preferably cuts off about .002 inch of the tin coated shield 60 to expose the copper core of the cable 48 before proceeding to the next step.
- the practitioner then removes about .75 inch of the tin coated shield 60 to expose the core conduc ⁇ tor 62 (as Fig. 6C shows) . This exposed area becomes the third region 56 of the cable 48.
- the practitioner than removes an additional amount of the sheath 58 beyond the already tinned shield 60 to expose a total of about 3 inches of the metallic mesh shield 60, of which about 0.175 inch remains tin coated. This forms the second region 54 of the cable 48.
- the remaining portion of the cable 48 (still enclosed within the sheath 58) becomes the first region 52 of the cable 48.
- the practitioner preferably applies an electroplastic conforming coat ⁇ ing 76 to the second cable region 54 that is not tin coated.
- the conforming coating 76 imparts greater strength to the flexible second region 54. It compen ⁇ sates for the absence of the sheath 58, but does not reduce the degree of flexibility required.
- Various conforming coatings 76 can be used.
- the illustrated embodiment uses an electroplastic sil- icone coating sold by Chemtronics under the tradename Konoform.
- the practitioner prefera- bly wraps and solders small gauge tin signal wire 78 around the junction of the steering wires 24 and 26 to the stepped shoulder 40.
- the wire wrap 78 imparts greater strength to this critical area of the steering mechanism.
- the wire wrap 78 holds the steering wires intimately against the stepped shoulder 40 both during and after their connection to the tinned end of the flexible, second cable region 54 (as Fig. 7B shows) .
- the practi ⁇ tioner preferably shrink fits a series of plastic rings 80 (for example, made of polyolefin material) about the main support wire 34, steering wires 24 and 26, and the underlying flexible second cable region 54.
- Fig. 8A shows the rings 80 before heat shrinking;
- Fig. 8B shows the rings 80 after heat shrinking.
- the rings 80 hold the steering wires 24 and
- the practitioner also preliminarily slides an outer pro ⁇ tective distal sleeve 82 over the coaxial cable and the now integrally attached steering mechanism.
- the practi ⁇ tioner affixes an end cap 84 about the stripped and solder coated second cable region 54, to which the steering mechanism is now integrally joined.
- the end cap 84 is attached using a suitable adhesive, like locktite.
- the third cable region 56 i.e., the ex ⁇ posed core conductor 62 extends through the attached cap 84.
- the practitioner posi ⁇ tions a temporary centering tool 86 between the core conductor 62 and the antenna 46.
- the centering tool 86 aligns the helical antenna centrally about the core conductor 62.
- the practitioner now solders the for ⁇ ward antenna end 72 to the core conductor 62.
- the practitioner removes the temporary centering tool 86 after making the soldered connection. After trimming away the excess wire at the soldered connection, it is preferably shaped to a blunt, tapered point, exposing the copper core (as Fig. 12 shows) .
- the practitioner surrounds the assembly of the core conductor 62 and helical antenna 46 with a mold tube 88.
- the mold tube 88 is made of a flexible plastic material (for exam ⁇ ple. Teflon) .
- One end fits snugly about the end cap 84.
- a small air vent hole 94 is drilled in this end next to the cap 84.
- the other end extends from the cap 84 and tapers to an opening 90 having a reduced diameter.
- the practitioner next injects a potting com ⁇ pound 92 into the fitted mold tube 88 through the ta- pered opening 90.
- the potting compound 92 fills the tube 88, completely encompassing the assembly of the core conductor 62 and helical antenna 46.
- the practi ⁇ tioner stops the injection when the compound 92 begins to leak from the air vent hole 94.
- the potting compound 92 includes a material that has the combined characteristics of (i) a high dielec ⁇ tric constant; (ii) low microwave energy loss; and (iii) high thermal conductivity. In the illustrated embodiment, a material
- the com ⁇ pound 92 is made by adding one unit part of diamond dust (about 1 micron) to one unit part of a medical grade epoxy mix.
- the one unit part of the epoxy mix consists of 1/2 resin and 1/2 hardener.
- the practitioner allows the injected potting compound 92 to air cure for about 5 minutes. Then, the practitioner places the potted assembly into an oven, where it cures for 30 minutes at 150 degrees F.
- the practitioner removes the mold tube 88 (see Fig. 13) .
- the end of the cured pot ⁇ ted compound 92 is shaped to a blunt tip.
- the distal sleeve 82 is slid into place and attached to the cap 84 by an adhesive.
- the potting compound 92 that encapsulates the entire assembly of the core conductor 62 and antenna 46 provides at least three benefits.
- the compound 92 provides a high dielectric con ⁇ stant for the antenna 46.
- the com ⁇ pound 92 maximizes the propagation of the desired ra- diation heating patterns about the antenna 46.
- SUBSTITUTE SHEET the compound 92 has high thermal conductivity that dissipates any undesirable conductive heat patterns about the antenna 46.
- Fig. 14 shows a whip microwave antenna as- sembly 96 that has been encapsulated by the potting compound 92 that embodies the features of the inven ⁇ tion.
- the method of making the assembly 96 shown in Fig. 14 generally follows the same progression of steps as previously described, except that in Fig. 14, the core conductor 62 itself serves as the antenna.
- Other microwave antenna structures can be similarly encapsulated within the potting compound and attached to a steering mechanism to achieve the benefits of the invention.
- Figs. 15 and 16 show another aspect of the invention that serves to reduce the propagation of conductive heating patterns by the antenna 46 and the attached coaxial cable 48.
- the catheter 10 carries an assembly 98 for cooling the coaxial cable 48 and antenna 46 during use.
- the cooling assembly 98 includes flexible tubing 100 that extends alongside the first and second regions 52 and 54 of the coaxial cable 48.
- the proxi- mal end 102 of the tubing 100 is located within the catheter handle 12.
- An external supply tube 104 ex ⁇ tends from the handle 12 and connects this end 102 of the tubing 100 to an external source 105 of pressur ⁇ ized gas, like carbon dioxide.
- the distal end 106 of the tubing 100 terminates in the second cable region 54, where the potting compound 92 encasing the antenna 46 begins.
- the tubing 100 includes one or more expan ⁇ sion orifices 108.
- the orifices 108 are formed at spaced intervals along the
- the pressurized gas conveyed by the tubing 100 exits the orifices 108 and expands.
- the expanding gas absorbs conductive heat propagated by the antenna 46 and the coaxial cable 48.
- the gas travels back along the guide tube 14 and vents out through openings 110 in the catheter handle 12.
- the inventions provide a steerable ablation catheter that delivers energy to the ablation site using an coaxial cable.
- the steering mechanism the inventions provide make possible the fabrication of highly steerable microwave antenna systems for cardiac ablation purposes.
- the inventions also provide a microwave an- tenna assembly for an ablation catheter that maximizes the propagation of radiation heating patterns for deep lesion formation while minimizing the propagation of conductive heating patterns that cause tissue damage and blood coagulation.
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Abstract
L'invention concerne un ensemble (14) d'antennes orientables qui utilise un câble coaxial pourvu d'une région proximale (50) se raccordant à une source d'énergie et d'une région distale (16) destiné à propager l'énergie. Le cable coaxial possède également une région intermédiaire (32) située entre les régions distale et proximale, présentant un degré de flexibilité plus important que celui de la région proximale. Un mécanisme de direction (10) est directement relié à la région intermédiaire (32) du câble coaxial afin de la courber et, avec elle, la région distale de propagation d'énergie du câble coaxial par rapport à sa région proximale.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US86800992A | 1992-04-13 | 1992-04-13 | |
US07/868,009 | 1992-04-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1993020893A1 true WO1993020893A1 (fr) | 1993-10-28 |
Family
ID=25350912
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1993/003429 WO1993020893A1 (fr) | 1992-04-13 | 1993-04-12 | Systeme d'antennes coaxiales orientables pour l'ablation cardiaque |
Country Status (1)
Country | Link |
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WO (1) | WO1993020893A1 (fr) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5405346A (en) * | 1993-05-14 | 1995-04-11 | Fidus Medical Technology Corporation | Tunable microwave ablation catheter |
DE4442690A1 (de) * | 1994-11-30 | 1996-06-05 | Delma Elektro Med App | Einrichtung zur interstitiellen Thermotherapie von Tumoren mit Hochfrequenzströmen |
US5693082A (en) * | 1993-05-14 | 1997-12-02 | Fidus Medical Technology Corporation | Tunable microwave ablation catheter system and method |
EP0835151A1 (fr) * | 1995-06-27 | 1998-04-15 | Arrow International Investment Corporation | Ensemble catheter evitant les coudures et orientable pour ablation par micro-ondes |
US5741249A (en) * | 1996-10-16 | 1998-04-21 | Fidus Medical Technology Corporation | Anchoring tip assembly for microwave ablation catheter |
US5766171A (en) * | 1994-02-09 | 1998-06-16 | Keravision, Inc. | Electrosurgical procedure for the treatment of the cornea |
US5810803A (en) * | 1996-10-16 | 1998-09-22 | Fidus Medical Technology Corporation | Conformal positioning assembly for microwave ablation catheter |
TWI734189B (zh) * | 2019-03-15 | 2021-07-21 | 日商日本來富恩有限公司 | 心腔內除顫導管 |
Citations (8)
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US4154246A (en) * | 1977-07-25 | 1979-05-15 | Leveen Harry H | Field intensification in radio frequency thermotherapy |
US4813429A (en) * | 1986-05-12 | 1989-03-21 | Biodan Medical Systems Ltd. | Catheter and probe |
US4921482A (en) * | 1989-01-09 | 1990-05-01 | Hammerslag Julius G | Steerable angioplasty device |
US4967765A (en) * | 1988-07-28 | 1990-11-06 | Bsd Medical Corporation | Urethral inserted applicator for prostate hyperthermia |
US5057106A (en) * | 1986-02-27 | 1991-10-15 | Kasevich Associates, Inc. | Microwave balloon angioplasty |
US5125395A (en) * | 1990-09-12 | 1992-06-30 | Adair Edwin Lloyd | Deflectable sheath for optical catheter |
US5131406A (en) * | 1989-09-20 | 1992-07-21 | Martin Kaltenbach | Guide for introduction of catheters into blood vessels and the like |
US5150717A (en) * | 1988-11-10 | 1992-09-29 | Arye Rosen | Microwave aided balloon angioplasty with guide filament |
-
1993
- 1993-04-12 WO PCT/US1993/003429 patent/WO1993020893A1/fr active Application Filing
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
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US4154246A (en) * | 1977-07-25 | 1979-05-15 | Leveen Harry H | Field intensification in radio frequency thermotherapy |
US5057106A (en) * | 1986-02-27 | 1991-10-15 | Kasevich Associates, Inc. | Microwave balloon angioplasty |
US4813429A (en) * | 1986-05-12 | 1989-03-21 | Biodan Medical Systems Ltd. | Catheter and probe |
US4967765A (en) * | 1988-07-28 | 1990-11-06 | Bsd Medical Corporation | Urethral inserted applicator for prostate hyperthermia |
US5150717A (en) * | 1988-11-10 | 1992-09-29 | Arye Rosen | Microwave aided balloon angioplasty with guide filament |
US4921482A (en) * | 1989-01-09 | 1990-05-01 | Hammerslag Julius G | Steerable angioplasty device |
US5131406A (en) * | 1989-09-20 | 1992-07-21 | Martin Kaltenbach | Guide for introduction of catheters into blood vessels and the like |
US5125395A (en) * | 1990-09-12 | 1992-06-30 | Adair Edwin Lloyd | Deflectable sheath for optical catheter |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5405346A (en) * | 1993-05-14 | 1995-04-11 | Fidus Medical Technology Corporation | Tunable microwave ablation catheter |
US5693082A (en) * | 1993-05-14 | 1997-12-02 | Fidus Medical Technology Corporation | Tunable microwave ablation catheter system and method |
US5957969A (en) * | 1993-05-14 | 1999-09-28 | Fidus Medical Technology Corporation | Tunable microwave ablation catheter system and method |
US5766171A (en) * | 1994-02-09 | 1998-06-16 | Keravision, Inc. | Electrosurgical procedure for the treatment of the cornea |
DE4442690A1 (de) * | 1994-11-30 | 1996-06-05 | Delma Elektro Med App | Einrichtung zur interstitiellen Thermotherapie von Tumoren mit Hochfrequenzströmen |
EP0835151A1 (fr) * | 1995-06-27 | 1998-04-15 | Arrow International Investment Corporation | Ensemble catheter evitant les coudures et orientable pour ablation par micro-ondes |
JPH11509751A (ja) * | 1995-06-27 | 1999-08-31 | アロウ・インターナショナル・インヴェストメント・コーポレイション | マイクロ波除去手術用高捩じれ低抗性操作可能カテーテル |
EP0835151A4 (fr) * | 1995-06-27 | 2000-01-05 | Arrow Int Investment | Ensemble catheter evitant les coudures et orientable pour ablation par micro-ondes |
US5741249A (en) * | 1996-10-16 | 1998-04-21 | Fidus Medical Technology Corporation | Anchoring tip assembly for microwave ablation catheter |
US5810803A (en) * | 1996-10-16 | 1998-09-22 | Fidus Medical Technology Corporation | Conformal positioning assembly for microwave ablation catheter |
TWI734189B (zh) * | 2019-03-15 | 2021-07-21 | 日商日本來富恩有限公司 | 心腔內除顫導管 |
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