AU718288B2 - Apparatus for cosmetically remodeling a body structure - Google Patents
Apparatus for cosmetically remodeling a body structure Download PDFInfo
- Publication number
- AU718288B2 AU718288B2 AU68988/96A AU6898896A AU718288B2 AU 718288 B2 AU718288 B2 AU 718288B2 AU 68988/96 A AU68988/96 A AU 68988/96A AU 6898896 A AU6898896 A AU 6898896A AU 718288 B2 AU718288 B2 AU 718288B2
- Authority
- AU
- Australia
- Prior art keywords
- tongue
- interior
- ablation
- source
- delivery device
- 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.)
- Expired
Links
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Description
WO 97/30644 PCT/US96/13414 APPARATUS FOR COSMETICALLY REMODELING A BODY STRUCTURE BACKGROUND OF THE INVENTION Field of the Invention This invention relates to a method for maintaining upper airway patency in human patients, and more particularly to a method which utilizes electromagnetic energy to debulk selected sections of the tongue and/or lingual tonsil without damaging the hypoglossal nerve.
Description of Related Art Sleep-apnea syndrome is a medical condition characterized by daytime hypersomnomulence, morning arm aches, intellectual deterioration, cardiac arrhythmias, snoring and thrashing during sleep. It is caused by frequent episodes of apnea during the patient's sleep. The syndrome is classically subdivided into two types. One type, termed "central sleep apnea syndrome", is characterized by repeated loss of respiratory effort. The second type, termed obstructive sleep apnea syndrome, is characterized by repeated apneic episodes during sleep resulting from obstruction of the patient's upper airway or that portion of the patient's respiratory tract which is cephalad to, and does not include, the larynx.
Treatment thus far includes various medical, surgical and physical measures. Medical measures include the use of medications such as protriptyline, medroxyprogesterone, acetazolamide, theophylline, nicotine and other medications in addition to avoidance of central nervous system depressants such as sedatives or alcohol. The medical measures above are sometimes helpful but are rarely completely effective. Further, the medications frequently have undesirable side effects.
Surgical interventions have included uvulopalatopharyngoplasty, tonsillectomy, surgery to correct severe retrognathia and tracheostomy. In one procedure the jaw is dislodged and pulled forward, in order to gain access to the WO 97/30644 PCTUS96/13414 base of the tongue. These procedures may be effective but the risk of surgery in these patients can be prohibitive and the procedures are often unacceptable to the patients.
Physical measures have included weight loss, nasopharyngeal airways, nasal CPAP and various tongue retaining devices used nocturnally. These measures may be partially effective but are cumbersome, uncomfortable and patients often will not continue to use these for prolonged periods of time.
Weight loss may be effective but is rarely achieved by these patients.
In patients with central sleep apnea syndrome, phrenic nerve or diaphragmatic pacing has been used. Phrenic nerve or diaphragmatic pacing includes the use of electrical stimulation to regulate and control the patient's diaphragm which is innervated bilaterally by the phrenic nerves to assist or support ventilation. This pacing is disclosed in Direct Diaphragm Stimulation by J. Mugica et al. PACE vol. 10 Jan-Feb. 1987, Part II, Preliminary Test of a Muscular Diaphragm Pacing System on Human Patients by J. Mugica et al.
from Neurostimulation: An Overview 1985 pp. 263-279 and Electrical Activation of Respiration by Nochomovitez IEEE Eng. in Medicine and Biology; June, 1993.
However, it was found that many of these patients also have some degree of obstructive sleep apnea which worsens when the inspiratory force is augmented by the pacer. The ventilation induced by the activation of the diaphragm also collapses the upper airway upon inspiration and draws the patient's tongue inferiorly down the throat choking the patient. These patients then require tracheostomies for adequate treatment.
A physiological laryngeal pacemaker as described in Physiological Laryngeal Pacemaker by F. Kaneko et al. from Trans Am Soc ArtifIntern Organs 1985 senses volume displaced by the lungs and stimulates the appropriate nerve to open the patient's glottis to treat dyspnea. This apparatus is not effective for treatment of sleep apnea. The apparatus produces a signal proportional in the displaced air volume of the lungs and thereby the signal P:\OPER\GCP\68988.RES 8/2/00 -3produced is too late to be used as an indicator for the treatment of sleep apnea.
There is often no displaced air volume in sleep apnea due to obstruction.
One measure that is effective in obstructive sleep apnea is tracheostomy.
However, this surgical intervention carries considerable morbidity and is aesthetically unacceptable to many patients. Other surgical procedures include pulling the tongue as forward as possible and surgically cutting and removing sections of the tongue and other structures which can close off the upper airway passage.
There is a need for a method and apparatus to overcome these problems.
SUMMARY OF THE INVENTION Accordingly, an object of the invention is to provide a method for cosmetically remodeling a tongue.
Another object of the invention is to provide a method for cosmetically remodeling a tongue without damaging a hypoglossal nerve of the tongue.
Still another object of the invention is to provide a method for cosmetically remodeling a tongue with reduced swelling of the tongue.
A further object of the invention is to provide a method for cosmetically remodeling a tongue by applying ablative energy to a selected site in an interior of the tongue without S damaging a hypoglossal nerve of the tongue.
*l 20 Still a further object of the invention is to provide a method for cosmetically remodeling a tongue by applying an ablative agent to a selected site in an interior of the tongue without damaging a hypoglossal nerve of the tongue.
."Another object of the invention is to provide a method for cosmetically remodeling a lingual tonsil.
According to the present invention there is provided a method for cosmetically remodeling a tongue, comprising: providing an ablation apparatus including a source of electromagnetic energy and one or more electromagnetic energy delivery electrodes coupled to the electromagnetic energy source; R advancing at least one electrode into an interior of the tongue; S delivering a sufficient amount of the electromagnetic energy from the electrode int the P:\OPER\GCP\68988.RES 8/2/00 interior of the tongue to debulk a section of the tongue and remodel the tongue without damaging the hypoglossal nerve and retracting the electrode from the interior of the tongue.
The invention also provides a method for cosmetically remodeling a lingual tonsil, comprising: providing an ablation apparatus including a source of electromagnetic energy and one or more electromagnetic energy delivery electrodes coupled to the electromagnetic energy source; advancing at least one electrode into a lingual tonsil; delivering sufficient electromagnetic energy from the electrode into an interior of the lingual tonsil to debulk and remodel the lingual tonsil; and retracting the electrode from the lingual tonsil.
The invention also provides a method for cosmetically remodeling a tongue, comprising: providing an ablation apparatus including a source of ablation energy and an ablation 15 energy delivery device; "advancing at least a portion of the ablation energy delivery device into an interior of the tongue; delivering a sufficient amount of energy from the energy delivery device into the interior of the tongue to debulk a section of the tongue and remodel the tongue without 20 permanently damaging a main branch of a hypoglossal nerve; and retracting the ablation energy delivery device from the interior of the tongue.
The invention also provides a method for cosmetically remodeling a tongue, comprising: providing an ablative agent source coupled to an ablative agent delivery device; S. advancing at least a portion of the ablative agent delivery device into an interior of the tongue; delivering a sufficient amount of an ablative agent from the ablative agent delivery device into the interior of the tongue to debulk a section of the tongue and remodel the tongue without damaging a hypoglossal nerve; and retracting the ablative agent delivery device from the interior of the tongue.
The invention also provides a method for cosmetically remodeling a tongue by reducing a of a tongue, comprising: providing an ablation apparatus including one or more RF electrodes coupled to an RF P:\OPER\GCP\68988.RES 8/2/00 -4energy source; positioning at least one electrode into an interior of the tongue; delivering RF energy from the electrode into the interior of the tongue; and ablating a section in the interior of the tongue without damaging a hypoglossal nerve.
BRIEF DESCRIPTION OF THE FIGURES Figure 1 is a cross-sectional view of an ablation apparatus used with the methods of the present invention.
Figure 2 is a cross-sectional view illustrating the catheter and connector of the ablation apparatus shown in Figure 1.
S
"WOO** Figure 3 is a perspective view of the connector illustrated in Figure 1.
Figure 4 is a perspective view of a needle electrode associated with the ablation 15 apparatus illustrated in Figure 1.
Figure 5 is a perspective view of a flexible needle electrode utilized with the methods of the present invention.
Figure 6 illustrates the creation of ablation zones with the ablation apparatus shown in Figure 1.
20 Figure 7 is a cross-sectional view of the tongue with the mouth closed.
Figure 8 is a cross-sectional view of the tongue with the mouth open.
Figure 9 is a perspective view f the tongue.
Figure 10 is a perspective view of the dorsum of the tongue.
Figure 11 is a cross-sectional view of the tongue.
Figure 12 is a cross-sectional view of the tongue illustrating the location of the hypoglossal nerves and the creation of an ablation zone.
Figure 13 is a cross-sectional view of the tongue illustrating a plurality of ablation zones.
WO 97/30644 PCTIUS96/13414 Figure 14 is a perspective view of the ventral surface of the tongue.
Figure 15 is a cross-sectional view of the tongue.
Figure 16 is a block diagram illustrating an analog amplifier, analog multiplexer and microprocessor used with the feedback control system.
Figure 17 is a block diagram of a temperature/impedance feedback system that can be used to control cooling medium flow rate through the catheter of Figure 1.
Figure 18 is a block diagram of a temperature/impedance feedback system that can be used to control cooling medium flow rate through the catheter of Figure 1.
Figure 19 is a three dimensional graph illustrating the percent shrinkage of the tongue following RF ablation.
Figure 20 is a graph illustrating two-dimensional shrinkage of bovine tongue tissue with RF ablation.
Figure 21 is a graph illustrating three-dimensional shrinkage of bovine tongue tissue due to RF ablation.
Figure 22 is a graph illustrating percent volume change in a tongue following RF ablation.
DETAILED DESCRIPTION A method for cosmetically remodeling and debulking the tongue, uvula, soft palate, lingual tonsil and/or adenoids provides an ablation apparatus including a source of electromagnetic energy and one or more electromagnetic energy delivery electrodes coupled to the electromagnetic energy source. At least one electrode is advanced into an interior of the tongue. Sufficient electromagnetic energy is delivered from the electrode to debulk a section of the tongue without damaging the hypoglossal nerve. The electrode is then removed from the interior of the tongue. A method for treating airway obstructions is achieved by debulking the tongue without damaging the hypoglossal nerve. The electrode can be introduced into the tongue from the tongue's tip, ventral surface, dorsum, underneath the tongue, along the tongue's midline, or in certain WO 97/30644 PCT/US96/13414 instances through the chin area. The tongue is ablated (debulked) without damaging the hypoglossal nerves, resulting in a remodeling of the tongue and a cosmetic change. This is achieved by positioning the electrodes far enough away from the hypoglossal nerves so that during the delivery of electromagnetic energy to the tongue, the hypoglossal nerves are not damaged. Another method for treating airway obstructions is achieved by debulking the lingual tonsil without damaging the hypoglossal nerve. These methods are used to treat sleep apnea.
Referring to Figures 1 and 2, an ablation apparatus 10 for cosmetically remodeling and debulking the tongue, lingual tonsils, uvula, soft palate and/or adenoids is illustrated. Ablation apparatus 10 can be positioned so that one or more energy delivery devices or electrodes 12 are introduced into an interior of the tongue through the tongue. Ablation apparatus 10 may include atraumatic intubation with or without visualization, provide for the delivery of oxygen or anesthetics, and can be capable of suctioning blood or other secretions. It will be appreciated that ablation apparatus 10 is used to treat a variety of different obstructions in the body where passage of gas is restricted. One embodiment is the treatment of sleep apnea using electrodes 12 to ablate (cell necrosis) selected portions of the tongue, lingual tonsils and/or adenoids by the use of resistive heating, RF, microwave, ultrasound and liquid thermal jet. The preferred energy source is an RF source. In this regard, ablation apparatus 10 can be used to ablate targeted masses including but not limited to the tongue, tonsils, turbinates, soft palate tissues, hard tissue and mucosal tissue. In one embodiment, ablation apparatus 10 is used to debulk the tongue in order to increase the cross-sectional area of the air passageway. A disinfectant medium introduction member introduces a disinfectant medium in the oral cavity in order to reduce infection of the ablated body member.
Prior to debulking the tongue, a presurgical evaluation may be performed including a physical examination, fiberoptic pharyngoscopy, cephalometric analysis and polygraphic monitoring. The physical examination emphasizes the evaluation of the head and neck. It also includes a close examination of the nasal WO 97/30644 PCT/US96/13414 cavity to identify obstructing deformities of the septum and turbinate; oropharyngeal obstruction from a long, redundant soft palate or hypertrophic tonsils; and hypopharyngeal obstruction from a prominent base of the tongue.
Debulking apparatus 10 includes a catheter 14, an optional handle 16 and one or more electrodes 12 extending from different ports 18 formed along a longitudinal surface of catheter 14, or from a distal end of electrode 12.
Catheter 14 can be a handpiece. An advancement device 20 may be provided.
Advancement device 20 can include guide tracks or tubes 23 positioned in the interior of catheter 14. Electrodes 12 may be positioned in guide tracks 23 and advanced from guide tracks into the interior of the tongue.
Ablation or debulking apparatus 10 includes a catheter 14, an optional handle 16 and one or more ablation source delivery device 12 extending from different ports 18 formed along a longitudinal surface of catheter 14, or from a distal portion of ablation source delivery device 12 Catheter 14 can be a handpiece. Ablation source delivery device advancement device 20, also known as advancement device 20 may be provided. Ablation source delivery device advancement device 20 can include guide tracks or tubes 23 positioned in the interior of catheter 14. Ablation source delivery device 12 may be positioned in guide tracks 23 and advanced from the guide tracks into the interior of the tongue. Cabling is coupled to ablation source delivery device 12.
Ablation source delivery device 12 may be least partially positioned in an interior of catheter 14. In one embodiment, ablation source delivery device 12 is advanced and retracted through a port 18 formed in an exterior surface of catheter 14. Ablation source delivery device advancement and retraction device 20 advances ablation source delivery device 12 out of catheter 14, into an interior of a body structure and can also provide a retraction of ablation source delivery device 12 from the interior of the body structure. Although the body structure can be any number of different structures, the body structure will hereafter be referred to as the tongue. Ablation source delivery device 12 pierce an exterior surface of the tongue and are directed to an interior region of the tongue. Sufficient ablation energy is delivered by ablation source 12 to the WO 97/30644 PCT/US96/13414 interior of the tongue to cause the tongue to become sufficiently ablated and debulked. Ablation source delivery device 12 can be a hollow structure that is, adapted to deliver different chemicals to a selected tongue interior ablation site (for chemical ablation) (ii) deliver alcohol or other liquids or semi-liquids to achieve ablation as well as a variety of different infusion mediums, including but not limited to saline, chemotherapy and the like. Different modalities can be combined to achieved a desired ablation including but not limited to RF and chemotherapy, chemical and chemotherapy. Ablation source delivery device 12 may have a limited travel distance in the tongue. In one embodiment with RF electrodes, this is achieved with an insulation sleeve that is in a surrounding relationship to an exterior of an electrode. Other devices can include a structure located on ablation source delivery device 12 which limits their advancement, or a structure coupled to a catheter which limits the advancement of ablation source delivery devices 12, such as a stop and the like. One suitable fluid is an electrolytic solution. Instead of direct contact with tissue and electrode 12 for the delivery of thermal energy, a cooled electrolytic solution can be used to deliver the thermal energy to the tissue. The electrolytic solution may be cooled in the range of about 30 to 55 degrees C.
Catheter 14 includes a catheter tissue interface surface 22, a cooling medium inlet conduit 24 and a cooling medium exit conduit 26 extending through an interior of catheter 14. Ports 18 are formed in the exterior of catheter 14, and are preferably formed on catheter tissue interface surface 22.
Ports 18 are isolated from a cooling medium flowing in inlet and outlet conduits 24 and 26. Cooling medium inlet and exit conduits 24 and 26 are configured to provide a cooled section of catheter tissue interface surface 22 of at least 1 to 2 2 cm 2 More preferably, the cooled section of catheter tissue interface surface 22 is at least equal to the cross-sectional diameter of the underlying zone of ablation.
In one embodiment, the cooled section of catheter tissue interface surface 22 is at least equal to the cross-sectional diameter of the underlying zone of ablation. In another embodiment, the cooled section of catheter tissue interface WO 97/30644 PCT/US96/13414 surface 22 only provides cooling to an area associated with each deployed ablation source delivery device.
The size of the cooled section of catheter tissue interface surface 22 varies for each patient. The size is sufficient enough to minimize swelling of the tongue following the delivery of electromagnetic energy. The reduction of swelling can be 50% or greater, 75% or greater, and 90% and greater. The amount of cooling provided is sufficient to enable the patient to return home shortly after the debulking procedure is performed, and not run the risk of choking on the tongue. It has been found that by providing a sufficient level of cooling over a relatively large area, the amount of ablation in an interior region of the tongue is enhanced. By providing a sufficiently large enough cooled section of catheter tissue interface surface 22, an adenomas response is minimized.
Handle 16 is preferably made of an insulating material. Electrodes 12 are made of a conductive material such as stainless steel. Additionally, electrodes 12 can be made of a shaped memory metal, such as nickel titanium, commercially available from Raychem Corporation, Menlo Park, California. In one embodiment, only a distal end of electrode 12 is made of the shaped memory metal in order to effect a desired deflection. When introduced into the oral cavity, catheter 14 can be advanced until a patient's gag response is initiated.
Catheter 14 is then retracted back to prevent patient's gagging. The distal end of electrode 12 can be semi-curved. The distal end can have a geometry to conform to an exterior of the tongue.
In one embodiment of the invention catheter 14 is a handpiece. In this embodiment, a separate handle 16 is not necessary. Debulking apparatus 10 is used to treat an interior region of the tongue. Catheter 14 has a distal end that is sized to be positioned within an oral cavity. Ablation source delivery device 12 is at least partially positioned within an interior of catheter 14. Ablation source delivery device 12 includes ablation delivery surface 30. Ablation source delivery device 20 is coupled to ablation source delivery device 12 and calibrated to advance ablation source delivery device 12 from catheter 14, including but not WO 97/30644 PCT/US96/13414 limited to a distal position of catheter 14, into the interior of the tongue when catheter 14 is positioned adjacent to a surface of the tongue. Ablation source delivery device 12 is advanced an advancement distance 33 from catheter 14 of sufficient length to treat the interior region of the tongue with ablation energy and/or an ablation effect without damaging the hypoglossal nerve or the surface ofthe tongue.
Catheter 14 can be malleable in order to conform to the surface of the tongue when a selected ablation target site is selected. An encapsulated soft metal, such as copper, or an annealed metal/plastic material can be used to form malleable catheter 14. All or a portion of catheter 14 may be malleable or made of a shaped memory metal.
For many applications it is desirable for a distal end 14' of catheter 14 to be deflectable. This can be achieved mechanically or with the use of memory metals. A steering wire, or other mechanical structure, can be attached to either the exterior or interior of distal end 14'. In one embodiment, a deflection knob located on handle 16 is activated by the physician causing a steering wire to tighten. This imparts a retraction of distal end 14', resulting in its deflection. It will be appreciated that other mechanical devices can be used in place of the steering wire. The deflection may be desirable for tissue sites with difficult access.
Controlled volumetric reduction of the tongue, under feedback control is used to achieve an effective opening in the airway passage. A variety of different pain killing medicaments, including but not limited to Xylocaine, may be used. A digital ultrasonic measurement system can be used. The ultrasound measurement quantifies biological shape changes, provides ultrasonic transmission and reception, uses piezoelectric transducers (crystals) and provides time of flight data.
A disinfectant medium introduction member 21 may also be introduced into the oral cavity. The disinfectant medium can be introduced prior to ablation, during ablation and/or after the ablation. It can be delivered continuously. The level of disinfection of the oral cavity is selectable as the WO 97/30644 PCTUS96/13414 volume of the oral cavity that is disinfected. The degree of disinfection varies.
Disinfection is provided to reduce infection of the ablated body structure.
Disinfectant medium introduction member 21 can be introduced before, after or during the introduction of ablation apparatus 10 into the oral cavity.
Additionally, disinfectant medium introduction member 21 can be removed at the same time or at a different time that ablation apparatus 10 is removed from the oral cavity.
Disinfectant medium introduction member 21 can be included in ablation apparatus 10, in an interior of catheter 14 or at an exterior of catheter 14, and may be an introducer with a lumen configured to introduce a disinfectant agent from a disinfectant agent source 23 into all or a selected portion of the oral cavity. Disinfectant medium introduction member 21 can be capable of movement within the oral cavity in order to provide for disinfection of all or only a portion of the oral cavity. For purposes of this disclosure, the oral cavity is that body internal environment where infectious germs may be introduced into the ablated tongue, soft tissue structure, and the like. Disinfectant medium introduction member 21 may be slideably positioned in catheter 14 or at its exterior. Alternatively, disinfectant medium introduction member 21 can be an optical fiber coupled to a light energy source, including but not limited to a UV source 25. The optical fiber can also be slideably be positioned in the oral cavity. The optical fiber is configured to provide for the selective disinfection of all or only a portion of the oral cavity and can have a variety of different distal ends to achieve this purpose.
Suitable disinfectant agents include but are not limited to Peridex, an oral rinse containing 0.12% chlorhexidine glucinate chlorophenyl) biganide} di-D-gluconate in a base containing water, 11.6% alcohol, glycerin, PEG 40 sorbitan arisoterate, flavor, dosium saccharin, and FD&C Blue No. 1.
It will be appreciated that a variety of different disinfectants can be employed, including other electromagnetic wavelengths, and various chemical compositions.
WO 97/30644 PCT/US96/13414 Electrodes 12 are at least partially positioned in an interior of catheter 14.
Each electrode 12 is advanced and retracted through a port 18 formed in an exterior surface of catheter 14. Advancement and retraction device advances electrodes 12 out of catheter 14, into an interior of a body structure and retracted back into catheter 14. Electrodes 12 pierce an exterior surface of the tongue and are directed to an interior region of the tongue. Sufficient electromagnetic energy is delivered by electrodes 12 to the interior of the tongue to cause the tongue to become sufficiently ablated and debulked. Electrodes 12 can be hollow to receive a variety of different infusion mediums, including but not limited to saline. Electrodes 12 may be limited in the distance that they can be advanced into the tongue. This is achieved with an insulation sleeve, a structure located on electrodes 12 which limits their advancement, or a structure coupled to catheter which limits the advancement of electrodes 12, such as a stop and the like.
The disinfectant medium can be introduced prior to ablation, during ablation and/or after the ablation. It can be delivered continuously. The level of disinfection of the oral cavity is selectable as is the volume of the oral cavity that is disinfected. The degree of disinfection varies. Disinfection is provided to reduce infection of the ablated body structure.
An ablation delivery surface, such as an electromagnetic energy delivery surface 30 of electrode 12 can be adjusted by inclusion of an adjustable or nonadjustable insulation sleeve 32 (Figures 3, 4, and Insulation sleeve 32 can be advanced and retracted along the exterior surface of electrode 12 in order to increase or decrease the length of the electromagnetic energy delivery surface Insulation sleeve 32 can be made of a variety of materials including but not limited to nylon, polyimides, other thermoplastics and the like. The size of electromagnetic energy delivery surface 30 can be varied by other methods including but not limited to creating a segmented electrode with a plurality of electrodes that are capable of being multiplexed and individually activated, and the like.
WO 97/30644 PCT/US96/13414 Referring specifically to Figure 4, ablation source delivery device 12 has an advancement length 33 that extends from an exterior surface of catheter 14 and is directed into the interior of the tongue. Advancement length 33 is sufficient to position ablation delivery surface 30 at a selected tissue site in the interior of the tongue. Ablation delivery surface 30 is of sufficient length so that the ablation effect is delivered to the selected tissue site, create a desired level of ablation at the selected tissue site without causing damage to the hypoglossal nerve. Ablation delivery surface 30 is not always at the distal end of ablation source delivery device 12. Insulation 32 can also be positioned at the distal end of ablation source delivery device 12. In this embodiment, ablation delivery surface 30 does not extend to the distal end of ablation source delivery device 12. However, ablation delivery surface 30 still delivers a sufficient ablation effect to create a desired level of cell necrosis in the interior of the tongue at the selected tissue site without damaging the hypoglossal nerve and/or damage to the surface of the tongue. Additionally, only one side or a portion of a side of ablation source delivery device 12 can be insulated. This also provides for an ablation source delivery device 12 which can be positioned throughout the tongue, including adjacent to a hypoglossal nerve. Where ablation source delivery device 12 is adjacent to the hypoglossal nerve, ablation source delivery device 12 is insulated.
In one embodiment, advancement length 33 is 1.2 to 1.5 cm, and the length of ablation delivery surface 30 is 5 to 10 mm, more preferably about 8 mm.
In another embodiment, advancement length 33 is insufficient to reach the hypoglossal nerve when introduced through any of the tongue surfaces, particularly the dorsum of the tongue.
Advancement device 20 is configured to advance at least a portion of each ablation source delivery device 12 to a placement position in the interior of the tongue. Advancement device 20 can also be configured to retract each ablation source delivery device 12. At the placement position, ablation delivery surface delivers sufficient ablation energy and/or effect to reduce a volume of the WO 97/30644 PCT/US96/13414 selected site without damaging a hypoglossal nerve and/or a surface of the tongue. In one embodiment, ablation source delivery device advancement and retraction device 20, with or without guide tracks 23, directs the delivery of ablation source delivery device 12 from catheter 14 into the interior of the tongue at an angle of 60 to 90 degrees relative to a longitudinal axis of catheter 14, and preferably about 70 degrees.
In certain embodiments, ablation source delivery device 12 has a geometric shape, including but not limited to a curved configuration that includes one or more insulated surfaces, either partially insulated on one side, at a proximal end, at a distal end, and the like, that is configured to reduce the volume of the selected tissue site without damaging a hypoglossal nerve. In one embodiment, ablation source delivery device 12 is introduced through any tongue surface and is configured so that a section of ablation source delivery device 12 which may be positioned close to the hypoglossal nerve is provided with insulation 32. As previously noted, insulation 32 can be positioned at different sites of ablation source delivery device 12.
Handle 16 can comprise a connector 34 coupled to retraction and advancement device 20. Connector 34 provides a coupling of electrodes 12 to power, feedback control, temperature and/or imaging systems. An RF/temperature control block 36 can be included.
In one embodiment, the physician moves retraction and advancement device 20 in a direction toward a distal end of connector 34. Electrodes 12 can be spring loaded. When retraction and advancement device 20 is moved back, springs cause selected electrodes 12 to advance out of catheter 14.
One or more cables 38 couple electrodes 12 to an electromagnetic energy source 40. A variety of energy sources 40 can be used with the present invention to transfer electromagnetic energy to the interior of a body structure, including but not limited to RF, microwave, ultrasound, coherent light and thermal transfer. Preferably, energy source 40 is a RF generator. When a RF energy source is used, the physician can activate RF energy source 40 by the use of a foot switch (not shown) coupled to RF energy source WO 97/30644 PCT/US96/13414 One or more sensors 42 may be positioned on an interior or exterior surface of electrode 12, insulation sleeve 32, or be independently inserted into the interior of the body structure. Sensors 42 permit accurate measurement of temperature at a tissue site in order to determine, the extent of ablation, (ii) the amount of ablation, (iii) whether or not further ablation is needed, and (iv) the boundary or periphery of the ablated geometry. Further, sensors 42 prevent non-targeted tissue from being destroyed or ablated.
Sensors 42 are of conventional design, including but not limited to thermistors, thermocouples, resistive wires, and the like. Suitable sensors 42 include a T type thermocouple with copper constantene, J type, E type, K type, fiber optics, resistive wires, thermocouple IR detectors, and the like. It will be appreciated that sensors 42 need not be thermal sensors.
Sensors 42 measure temperature and/or impedance to permit ablation monitoring. This reduces damage to tissue surrounding the targeted ablation mass. By monitoring the temperature at various points within the interior of the body structure the periphery of ablation can be ascertained and it is possible to determine when the ablation is completed. If at any time sensor 42 determines that a desired ablation temperature is exceeded, then an appropriate feedback signal is received at energy source 40 and the amount of energy delivered is regulated.
Ablation or debulking apparatus 10 can include visualization capability including but not limited to a viewing scope, an expanded eyepiece, fiber optics, video imaging, and the like.
Additionally, ultrasound imaging can be used to position the electrodes 12 and/or determine the amount of ablation. One or more ultrasound transducers 44 can be positioned in or on electrode 12, catheter 14, or on a separate device. An imaging probe may also be used internally or externally to the selected tissue site. A suitable imaging probe is Model 21362, manufactured and sold by Hewlett Packard Company. Each ultrasound transducer 44 is coupled to an ultrasound source (not shown).
WO 97/30644 PCTIUS96/13414 With reference now to Figure 6 catheter 14 is shown as being introduced into the oral cavity and multiple RF electrodes 12 are advanced into the interior of the tongue creating different ablation zones 46. Using RF, ablation apparatus can be operated in either bipolar or monopolar modes. In Figure 6, electrodes 12 are operated in the bipolar mode, creating sufficient ablation zones 46 to debulk the tongue without affecting the hypoglossal nerves and creating a larger airway passage. With this debulking, the back of the tongue moves in a forward direction away from the air passageway. The result is an increase in the cross-sectional diameter of the air passageway.
Using RF, ablation apparatus 10 can also be operated in the monopolar mode. A groundpad can be positioned in a convenient place such as under the chin. A single electrode 12 is positioned in the tongue to create a first ablation zone 46. Electrode 12 can then be retracted from the interior of the tongue, catheter 14 moved, and electrode 12 is then advanced from catheter 14 into another interior section of the tongue. A second ablation zone 46 is created.
This procedure can be completed any number of times to form different ablation regions in the interior of the tongue. More than one electrode 12 can be introduced into the tongue and operated in the bipolar mode. Electrodes 12 are then repositioned in the interior of the tongue any number of times to create a plurality of connecting or non-connecting ablation zones 46.
Referring now to Figures 7 through 15, various anatomical views of the tongue and other structures are illustrated. The different anatomical structures are as follows: the genioglossus muscle, or body of the tongue is denoted as 48; the geniohyoid muscle is 50; the mylohyoid muscle is 52; the hyoid bone is 54; the tip of the tongue is 56; the ventral surface of the tongue is denoted as 58; the dorsum of the tongue is denoted as 60; the inferior dorsal of the tongue is denoted as 62; the reflex of the vallecula is 64; the lingual follicles are denoted as 66; the uvula is 68; the adenoid area is 70; the lateral border of the tongue is 72; the circumvallate papilla is 74, the palatine tonsil is 76; the pharynx is 78; the redundant pharyngeal tissue is 80; the foramen cecum is 82; the hypoglossal nerve is 84, and the lingual frenum of the tongue is 86.
WO 97/30644 PCT/US96/13414 Dorsum 60 is divided into an anterior 2/3 and inferior dorsal 62. The delineation is determined by circumvallate papilla 74 and foramen cecum 82.
Inferior dorsal 62 is the dorsal surface inferior to circumvallate papilla 74 and superior reflex of the vallecula 64. Reflex of the vallecula 64 is the deepest portion of the surface of the tongue contiguous with the epiglottis. Lingual follicles 66 comprise the lingual tonsil.
Catheter 14 can be introduced through the nose or through the oral cavity. Electrodes 12 can be inserted into an interior of the tongue through dorsum surface 60, inferior dorsal surface 62, ventral surface 58, tip 56 or geniohyoid muscle 50. Additionally, electrodes may be introduced into an interior of lingual follicles 66 and into adenoid area 70. Once electrodes 12 are positioned, insulation sleeve 32 may be adjusted to provided a desired electromagnetic energy delivery surface 30 for each electrode 12.
Ablation zones 46 are created without damaging hypoglossal nerves 84.
This creates a larger air way passage and provides a treatment for sleep apnea.
In all instances, the positioning of electrodes 12, as well as the creation of ablation zones 46 is such that hypoglossal nerves 84 are not ablated or damaged.
The ability to swallow and speak is not impaired.
In one embodiment, RF electrode 12 are placed on the dorsum surface of the tongue. The first electrode is positioned 0.5 cm proximal to the circumvallate pappilla. The other electrodes are spaced 1.6 cm apart and are 1 cm off a central axis of the tongue. In one embodiment, 465 MHz RF was applied. The temperature at the distal end of electrode 12 was about 100 degrees C. The temperature at the distal end of the insulation sleeve 32 was about 60 degrees C. In another embodiment, the temperature at the distal end of insulation sleeve 32 was 43 degrees C and above. RF energy can be applied as short duration pulses with low frequency RF. Precise targeting of a desired ablation site is achieved. One or more electrodes 12 may be used to create volumetric three-dimensional ablation. A variety of ablation geometries are possible, including but not limited to rectilinear, polyhedral, redetermined shapes, symmetrical and non-symmetrical.
WO 97/30644 PCT/US96/13414 Referring now to Figures 16 and 17 an open or closed loop feedback system couples sensors 42 to energy source 40. The temperature of the tissue, or of electrode 12 is monitored, and the output power of energy source adjusted accordingly. Additionally, the level of disinfection in the oral cavity can be monitored. The physician can, if desired, override the closed or open loop system. A microprocessor can be included and incorporated in the closed or open loop system to switch power on and off, as well as modulate the power.
The closed loop system utilizes a microprocessor 88 to serve as a controller, watch the temperature, adjust the RF power, look at the result, refeed the result, and then modulate the power.
With the use of sensors 42 and the feedback control system a tissue adjacent to RF electrodes 12 can be maintained at a desired temperature for a selected period of time without impeding out. Each RF electrode 12 is connected to resources which generate an independent output for each RF electrode 12. An output maintains a selected energy at RF electrodes 12 for a selected length of time.
When an RF electrode is used, current delivered through RF electrodes 12 is measured by current sensor 90. Voltage is measured by voltage sensor 92.
Impedance and power are then calculated at power and impedance calculation device 94. These values can then be displayed at user interface and display 96.
Signals representative of power and impedance values are received by a controller 98.
A control signal is generated by controller 98 that is proportional to the difference between an actual measured value, and a desired value. The control signal is used by power circuits 100 to adjust the power output in an appropriate amount in order to maintain the desired power delivered at respective RF electrodes 12.
In a similar manner, temperatures detected at sensors 42 provide feedback for maintaining a selected power. The actual temperatures are measured at temperature measurement device 102, and the temperatures are displayed at user interface and display 96. A control signal is generated by WO 97/30644 PCT/US96/13414 controller 98 that is proportional to the difference between an actual measured temperature, and a desired temperature. The control signal is used by power circuits 100 to adjust the power output in an appropriate amount in order to maintain the desired temperature delivered at the respective sensor. A multiplexer can be included to measure current, voltage and temperature, at the numerous sensors 42, and energy can be delivered to RF electrodes 12 in monopolar or bipolar fashion.
Controller 98 can be a digital or analog controller, or a computer with software. When controller 98 is a computer it can include a CPU coupled through a system bus. On this system can be a keyboard, a disk drive, or other non-volatile memory systems, a display, and other peripherals, as are known in the art. Also coupled to the bus is a program memory and a data memory.
User interface and display 96 includes operator controls and a display.
Controller 98 can be coupled to imaging systems, including but not limited to ultrasound, CT scanners, X-ray, MRI, mammographic X-ray and the like.
Further, direct visualization and tactile imaging can be utilized.
The output of current sensor 90 and voltage sensor 92 is used by controller 98 to maintain a selected power level at RF electrodes 12. The amount of RF energy delivered controls the amount of power. A profile of power delivered can be incorporated in controller 98, and a preset amount of energy to be delivered can also be profiled. Other sensors similar to sensors and 92 can be used by controller 98 for other ablation source delivery devices 12 to maintain a controllable amount of an ablation energy and/or ablative agent.
Circuitry, software and feedback to controller 98 result in process control, and the maintenance of the selected power that is independent of changes in voltage or current, and are used to change, the selected power, (ii) the duty cycle (on-off and wattage), (iii) bipolar or monopolar energy delivery, and (iv) infusion medium delivery, including flow rate and pressure.
These process variables are controlled and varied, while maintaining the desired delivery of power independent of changes in voltage or current, based on temperatures monitored at sensors 42.
WO 97/30644 PCTIUS96/13414 Current sensor 90 and voltage sensor 92 are connected to the input of an analog amplifier 104. Analog amplifier 104 can be a conventional differential amplifier circuit for use with sensors 42. The output of analog amplifier 104 is sequentially connected by an analog multiplexer 106 to the input of A/D converter 108. The output of analog amplifier 104 is a voltage which represents the respective sensed temperatures. Digitized amplifier output voltages are supplied by A/D converter 108 to microprocessor 88. Microprocessor 88 may be a type 68HCI available from Motorola. However, it will be appreciated that any suitable microprocessor or general purpose digital or analog computer can be used to calculate impedance or temperature.
Microprocessor 88 sequentially receives and stores digital representations of impedance and temperature. Each digital value received by microprocessor 88 corresponds to different temperatures and impedances.
Calculated power and impedance values can be indicated on user interface and display 96. Alternatively, or in addition to the numerical indication of power or impedance, calculated impedance and power values can be compared by microprocessor 88 with power and impedance limits. When the values exceed predetermined power or impedance values, a warning can be given on user interface and display 96, and additionally, the delivery of RF energy can be reduced, modified or interrupted. A control signal from microprocessor 88 can modify the power level supplied by energy source Figure 18 illustrates a block diagram of a temperature/impedance feedback system that can be used to control cooling medium flow rate through catheter 14. Electromagnetic energy is delivered to electrode 12 by energy source 44, and applied to tissue. A monitor 110 ascertains tissue impedance, based on the energy delivered to tissue, and compares the measured impedance value to a set value. If the measured impedance exceeds the set value a disabling signal 112 is transmitted to energy source 40, ceasing further delivery of energy to electrode 12. If measured impedance is within acceptable limits, energy continues to be applied to the tissue. During the application of energy to tissue sensor 42 measures the temperature of tissue and/or electrode 12. A comparator WO 97/30644 PCT/US96/13414 114 receives a signal representative of the measured temperature and compares this value to a pre-set signal representative of the desired temperature.
Comparator 114 sends a signal to a flow regulator 116 representing a need for a higher cooling medium flow rate, if the tissue temperature is too high, or to maintain the flow rate if the temperature has not exceeded the desired temperature.
EXAMPLE 1 Ablation apparatus 10 was used to determine two-dimensional shrinkage of a bovine. RF volumetric reduction was achieved using a single needle electrode. Four miniature ultrasonic crystals were positioned to form a square.
Measurements were taken at control and post volumetric reduction at 15 watts initially with a 13% volumetric reduction, and 15 watts for 4 hours with an additional 4% volumetric reduction. A total 17% volumetric reduction was achieved.
EXAMPLE 2 Ablation apparatus 10 was used to determine three-dimensional shrinkage of a bovine tongue. RF volumetric reduction was achieved with a single needle electrode with eight miniature ultrasonic crystals, creating a cube.
Application of 16 watts initially produced a 17% volumetric reduction of the tongue, 25 watts applied initially produced a 25% volumetric reduction, and watts after hours produced an additional 4% reduction, for a total volumetric reduction of 29%.
EXAMPLE 3 A 35% volumetric reduction was achieved in porcine in vivo, with three dimensional gross at 20 watts initial application.
Referring now to Figure 19, ablation volume dimensions were measured with a multidimensional digital sonomicrometry. An average decrease in the Z direction was 20%, and volume shrinkage was 26%. Three-dimensional shrinkage of tongue tissue due to in vivo REF ablation with the needle, ablation with 20 Watts) is presented in Figure 20. Control volume before ablation is compared with a post-ablation volume.
Figure 20 illustrates two-dimensional shrinkage of a bovine tongue tissue due to RF ablation with a needle electrode. The before and after ablation results are illustrated.
Figure 21 illustrates in graph form ablation at 16 Watts resulted in a 17% volume shrinkage of the tissue in post-ablation verses control. Ablation at watts resulted in a 25% volume shrinkage after ablation. An additional 4% area shrinkage was obtained after in long-term post ablation (4 hours) verses postablation.
Figure 22 illustrates a percent volume change after RF ablation. 16 Watts, ablation at 16 Watts for 20 minutes; 25 Watts, ablation at 25 Watts for minutes; 25 Watts (4 hours), and long tern post ablation (4 hours after 25 Watts ablation).
The foregoing description of a preferred embodiment of the invention has been presented for purposes of illustra 1 and description. It is not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obviously, t many modifications and variations will be apparent to practitioners skilled in this lit art. It is intended that the scope of the invention be defined by the following claims and their equivalents.
~What is claimed is: Throughout this specification and the claims which follow, unless the context requires otherwise, the word "comprise", and variations such as "comprises" and "comprising", will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not 0p the exclusion of any other integer or step or group of integers or steps.
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Claims (48)
1. A method for cosmetically remodeling a tongue, comprising: providing an ablation apparatus including a source of electromagnetic energy and one or more electromagnetic energy delivery electrodes coupled to the electromagnetic energy source; advancing at least one electrode into an interior of the tongue; delivering a sufficient amount of electromagnetic energy from the electrode into the interior of the tongue to debulk a section of the tongue and remodel the tongue without damaging the hypoglossal nerve; and retracting the electrode from the interior of the tongue.
2. The method of claim 1, wherein the energy source is an RF source.
3. The method of claim 1, wherein the energy source is a microwave source.
4. The method of claim 1, wherein the electrode is advanced into an interior of the tongue through a ventral surface of the tongue.
The method of claim 1, wherein the electrode is advanced into an interior of the tongue through an inferior dorsal surface of the tongue.
6. The method of claim 1, wherein the electrode is advanced into an interior of the tongue through a dorsum surface of the tongue.
7. The method of claim 1, wherein the electrode is advanced into an interior of the tongue through a tip of the tongue.
8. The method of claim 1, wherein two or more electrodes are advanced into a different interior area of the tongue. WO 97/30644 PCT/US96/13414
9. The method of claim 1, wherein two or more electrodes are introduced through a different surface site of the tongue.
The method of claim 1, wherein the ablation apparatus further comprises: a catheter including a lumen, wherein the electrode is deployed from the catheter lumen into an interior of the tongue.
11. The method of claim 1, wherein the catheter further comprises: a cooling element.
12. The method of claim 11, wherein the cooling element comprises a cooling channel in an interior of the catheter, the cooling channel receiving a cooling medium and circulating the cooling medium through the interior of the catheter.
13. The method of claim 12, further comprising: cooling a surface of the tongue while an electrode ablates an interior section of the tongue.
14. The method of claim 10, wherein the catheter is introduced into an oral cavity and one or more electrodes are introduced into an interior of the tongue through one of an inferior dorsal surface of the tongue, a dorsum surface of the tongue, or a tip of the tongue.
15. The method of claim 10, wherein the catheter is introduced into an oral cavity and one or more electrodes are introduced into an interior of the tongue through a ventral surface of the tongue. WO 97/30644 PCT/US96/13414
16. The method of claim 1, further comprising: providing an imaging apparatus.
17. The method of claim 16, wherein the imaging apparatus is an ultrasound device.
18. The method of claim 16, further comprising: imaging the tongue prior to debulking the tongue.
19. The method of claim 16, further comprising: imaging the tongue after debulking the tongue.
A method for cosmetically remodeling a lingual tonsil, comprising: providing an ablation apparatus including a source of electromagnetic energy and one or more electromagnetic energy delivery electrodes coupled to the electromagnetic energy source,; advancing at least one electrode into a lingual tonsil; delivering sufficient electromagnetic energy from the electrode into an interior of the lingual tonsil to debulk and remodel the lingual tonsil; and retracting the electrode from the lingual tonsil.
21. The method of claim 20, wherein the energy source is an RF source.
22. The method of claim 20, wherein one or more electrodes are advanced into a different section of the lingual tonsil.
23. The method of claim 20, further comprising: providing an imaging apparatus.
24. The method of claim 23, wherein the imaging apparatus is an ultrasound device.
The method of claim 23, further comprising: imaging the lingual tonsil prior to debulking.
26. The method of claim 23, further comprising: imaging the lingual tonsil after debulking.
27. A method for cosmetically remodeling a tongue, comprising: Sproviding an ablation apparatus including a source of ablation energy and an ablation energy delivery device; advancing at least a portion of the ablation energy delivery device into an irterior of the tongue; delivering a sufficient amount of energy from the energy delivery device into the interior of the tongue to debulk a section of the tongue and remodel the tongue without permanently damaging a main branch of a hypoglossal nerve; and retracting the ablation energy delivery device from the interior of the tongue.
28. The method of claim 27, wherein the energy source is an RF source and the ablation energy delivery device is an RF electrode.
29. The method of claim 27, wherein the energy source is a coherent source of light and the ablation energy delivery device is an optical fiber.
The method of claim 27, wherein the energy source is a heated fluid and the ablation energy delivery device is a catheter with a closed channel configured to receive the heated fluid. 26 0 44)~
31. The method of claim 27, wherein the energy source is a heated fluid and the ablation energy delivery device is a catheter with an open channel configured to receive the heated fluid.
32. The method of claim 27, wherein the energy source is a cooled fluid and the ablation energy delivery device is a catheter with a closed channel configured to receive the cooled fluid.
33. The method of claim 27, wherein the energy source is a cooled fluid and the ablation energy delivery device is a catheter with an open channel configured to receive the cooled fluid.
34. The method of claim 27, wherein the energy source is a cryogenic fluid.
35. The method of claim 27, wherein the energy source is a microwave source providing energy from 915 MHZ to 2.45 GHZ and the ablation energy delivery device is a microwave antenna. 5
36. The apparatus of claim 27, wherein the energy source is an ultrasound source and the ablation energy delivery device is an ultrasound emitter. 9
37. The method of claim 27, wherein the energy source is a microwave source. 9 f
38. The method of claim 27, wherein the electrode is advanced into an interior of the tongue through a ventral surface of the tongue.
39. The method of claim 27, wherein the ablation energy delivery device is advanced into an interior of the tongue through an inferior dorsal surface of the tongue.
The method of claim 27, wherein the ablation energy delivery device is advanced into an interior of the tongue through a dorsum surface of the tongue.
41. The method of claim 27, wherein the ablation energy delivery device is advanced into an interior of the tongue through a tip of the tongue.
42. A method for cosmetically remodeling a tongue,' comprising: providing an ablative agent source coupled to an ablative agent delivery device; advancing at least a portion of the ablative agent delivery device into an interior of the tongue; delivering a sufficient amount of an ablative agent from the ablative agent delivery device into the interior of the tongue to debulk a section of the tongue and remodel the tongue without damaging a hypoglossal nerve; and retracting the ablative agent delivery device from the interior of the tongue.
43. The method of claim 42, wherein the ablative agent is a chemical composition or mixture of compositions.
44. The method of claim 42, wherein the ablative agent includes an alcohol composition.
The method of claim 42, wherein the ablative agent is a chemotherapeutic agent. 28 AMENDED SHEET P:\OPER\GCP\68988.RES 8/2/00 -29-
46. The method of claim 45, further comprising: providing an RF electrode to deliver electromagnetic energy to an interior section of the tongue.
47. A method for cosmetically remodeling a tongue by reducing a volume of a tongue, comprising: providing an ablation apparatus including one or more RF electrodes coupled to an RF energy source; positioning at least one electrode into an interior of the tongue; delivering RF energy from the electrode into the interior of the tongue; and ablating a section in the interior of the tongue without damaging a hypoglossal nerve.
48. A method for cosmetically remodeling a tongue substantially as hereinbefore described C S* 15 with reference to the accompanying drawings. DATED this 8th day of February 2000 C C SOMNUS MEDICAL TECHNOLOGIES, INC. 20 By its Patent Attorneys DAVIES COLLISON CAVE C C ftff
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US08/606,195 US5707349A (en) | 1994-05-09 | 1996-02-23 | Method for treatment of air way obstructions |
US08/606195 | 1996-02-23 | ||
US08/695796 | 1996-08-12 | ||
US08/695,796 US5800379A (en) | 1996-02-23 | 1996-08-12 | Method for ablating interior sections of the tongue |
PCT/US1996/013414 WO1997030644A1 (en) | 1996-02-23 | 1996-08-16 | Apparatus for cosmetically remodeling a body structure |
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AU718288B2 true AU718288B2 (en) | 2000-04-13 |
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AU68988/96A Expired AU718288B2 (en) | 1996-02-23 | 1996-08-16 | Apparatus for cosmetically remodeling a body structure |
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JP (1) | JP2001501491A (en) |
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1996
- 1996-08-12 US US08/695,796 patent/US5800379A/en not_active Expired - Fee Related
- 1996-08-16 EP EP96929700A patent/EP0957796A1/en not_active Ceased
- 1996-08-16 AU AU68988/96A patent/AU718288B2/en not_active Expired
- 1996-08-16 KR KR1019980706606A patent/KR19990087209A/en not_active Application Discontinuation
- 1996-08-16 JP JP09530111A patent/JP2001501491A/en not_active Abandoned
- 1996-08-16 WO PCT/US1996/013414 patent/WO1997030644A1/en not_active Application Discontinuation
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EP0608609A2 (en) * | 1992-12-01 | 1994-08-03 | Cardiac Pathways Corporation | Catheter for RF ablation with cooled electrode and method |
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Also Published As
Publication number | Publication date |
---|---|
WO1997030644A1 (en) | 1997-08-28 |
US5800379A (en) | 1998-09-01 |
EP0957796A1 (en) | 1999-11-24 |
JP2001501491A (en) | 2001-02-06 |
KR19990087209A (en) | 1999-12-15 |
AU6898896A (en) | 1997-09-10 |
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FGA | Letters patent sealed or granted (standard patent) |