US20150073245A1 - System and method for measuring force and torque applied to a catheter electrode tip - Google Patents
System and method for measuring force and torque applied to a catheter electrode tip Download PDFInfo
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- US20150073245A1 US20150073245A1 US14/496,153 US201414496153A US2015073245A1 US 20150073245 A1 US20150073245 A1 US 20150073245A1 US 201414496153 A US201414496153 A US 201414496153A US 2015073245 A1 US2015073245 A1 US 2015073245A1
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- 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
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- 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
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- A61B5/042—
-
- 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
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/12—Diagnosis using ultrasonic, sonic or infrasonic waves in body cavities or body tracts, e.g. by using catheters
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/02—Details
- A61N1/04—Electrodes
- A61N1/05—Electrodes for implantation or insertion into the body, e.g. heart electrode
-
- 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
- A61B18/02—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by cooling, e.g. cryogenic techniques
-
- 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
- A61B18/20—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 laser
- A61B18/22—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 laser the beam being directed along or through a flexible conduit, e.g. an optical fibre; Couplings or hand-pieces therefor
- A61B18/24—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 laser the beam being directed along or through a flexible conduit, e.g. an optical fibre; Couplings or hand-pieces therefor with a catheter
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
- A61B90/06—Measuring instruments not otherwise provided for
- A61B2090/064—Measuring instruments not otherwise provided for for measuring force, pressure or mechanical tension
- A61B2090/065—Measuring instruments not otherwise provided for for measuring force, pressure or mechanical tension for measuring contact or contact pressure
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2218/00—Details of surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B2218/001—Details of surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body having means for irrigation and/or aspiration of substances to and/or from the surgical site
- A61B2218/002—Irrigation
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N7/00—Ultrasound therapy
- A61N7/02—Localised ultrasound hyperthermia
- A61N7/022—Localised ultrasound hyperthermia intracavitary
Definitions
- This invention relates to a system and method for assessing the force and torque between an electrode and tissue in a body.
- the instant invention relates to a system and method for assessing the force and torque between an electrode tip on a diagnostic and/or therapeutic medical device such as a mapping or ablation catheter and tissue, such as cardiac tissue.
- the instant invention also relates to a method for sensing and calculating contact force exerted by another component on a tissue, and generally, a method for sensing and calculating contact force on an elongate member when in contact with another component or structure, for medical or non-medical purposes.
- Electrodes are used on a variety of diagnostic and/or therapeutic medical devices.
- electrodes may be used on cardiac mapping catheters to generate an image of the internal geometry of a heart and electrical potentials within the tissue.
- Electrodes are also used on ablation catheters to create tissue necrosis in cardiac tissue to correct conditions such as atrial arrhythmia (including, but not limited to, ectopic atrial tachycardia, atrial fibrillation, and atrial flutter).
- Arrhythmia can create a variety of dangerous conditions including irregular heart rates, loss of synchronous atrioventricular contractions and stasis of blood flow which can lead to a variety of ailments and even death.
- the ablation catheter imparts ablative energy (e.g., radiofrequency energy, cryoablation, lasers, chemicals, high-intensity focused ultrasound, etc.) to cardiac tissue to create a lesion in the cardiac tissue.
- ablative energy e.g., radiofrequency energy, cryoablation, lasers, chemicals, high-intensity focused ultrasound, etc.
- the safety and effectiveness of many of diagnostic and/or therapeutic devices is often determined in part by the proximity of the device and the electrodes to the target tissue.
- mapping catheters the distance between the electrodes and the target tissue affects the strength of the electrical signal and the identity of the mapping location.
- the safety and effectiveness of ablation lesions is determined in part by the proximity of the ablation electrode to target tissue and the effective application of energy to that tissue. If the electrode is too far from the tissue or has insufficient contact with the tissue, the lesions created may not be effective. On the other hand, if the catheter tip containing the electrode contacts the tissue with excessive force, the catheter tip may perforate or otherwise damage the tissue (e.g., by overheating). Therefore, to successfully ablate live tissue, the electrode should be applied to the tissue with proper force.
- knowledge of direction of the force i.e. multi-axial measurement
- torque acting on the electrode tip are important for estimating the distribution of pressure and stress over an electrode tip surface.
- Contact force between a catheter electrode and tissue has typically been determined using one or more of the following methods: clinician sense, fluoroscopic imaging, intracardiac echo (ICE), atrial electrograms (typically bipolar D-2), pacing thresholds, evaluation of lesion size at necropsy and measurement of temperature change at the energy delivery site.
- clinician sense fluoroscopic imaging
- intracardiac echo ICE
- atrial electrograms typically bipolar D-2
- pacing thresholds typically evaluation of lesion size at necropsy
- measurement of temperature change at the energy delivery site typically been determined using one or more of the following methods: clinician sense, fluoroscopic imaging, intracardiac echo (ICE), atrial electrograms (typically bipolar D-2), pacing thresholds, evaluation of lesion size at necropsy and measurement of temperature change at the energy delivery site.
- ICE intracardiac echo
- atrial electrograms typically bipolar D-2
- pacing thresholds typically bipolar D-2
- evaluation of lesion size at necropsy typically bipolar D-2
- a clinician can evaluate contact force based on tactile feedback from the catheter and prior experience
- the determination depends largely on the experience of the clinician and is also subject to change based on variations in the mechanical properties of catheters used by the clinician.
- the determination is particularly difficult when using catheters that are relatively long (such as those used to enter the left atria of the heart).
- fluoroscopic images are two-dimensional projections and blood and myocardium attenuate x-rays similarly, it can be difficult to quantify the degree of contact force and detect when the catheter tip is not in contact with the tissue.
- Intracardiac echo can be time consuming and it can be difficult to align the echo beam with the ablation catheter. Further, intracardiac echo does not always permit the clinician to confidently assess the degree of contact and can generate unacceptable levels of false positives and false negatives in assessing whether the electrode is in contact with tissue.
- Atrial electrograms do not always correlate well to tissue contact and are also prone to false negatives and positives.
- Pacing thresholds also do not always correlate well with tissue contact and pacing thresholds can be time-consuming and also prone to false positives and negatives because tissue excitability may vary in hearts with arrhythmia. Evaluating lesion size at necropsy is seldom available in human subjects, provides limited information (few data points) and, further, it is often difficult to evaluate the depth and volume of lesions in the left and right atria. Finally, temperature measurements provide limited information (few data points) and can be difficult to evaluate in the case of irrigated catheters.
- the inventors herein have thus recognized a need for a system and method for determining the contact force and torque upon an electrode tip, both during RF ablation and when driving the RF electrode to the ablation site, that will minimize and/or eliminate one or more of the above-identified deficiencies.
- a system for assessing a degree of coupling between an electrode and a tissue in a body in accordance with one embodiment of the invention may include a contact sensing assembly including a catheter having a body having a proximal end and a distal end, and an electrode including a tip portion and a base portion mounted adjacent a head portion of the catheter body.
- One or more force and torque sensors may be disposed generally adjacent the base portion and may include one or more pressure sensors for measuring pressure applied to the electrode tip portion and providing a pressure signal related to the measured pressure, with the pressure sensor including a predetermined sensitivity.
- the base and head portions may include a predetermined rigidity so that force applied to the electrode tip portion may be determinable as a function of the predetermined sensitivity and the pressure signal.
- the assembly may include a plurality of pressure sensors, and the individual pressure sensor output signals allow a vector reconstruction of a net tip contact force using a vector addition algorithm or relationship.
- the assembly may further include a plurality of pressure sensors, and the force applied to the electrode tip portion may be determinable as a sum of a voltage output signal of each pressure sensor respectively divided by the predetermined sensitivity of each pressure sensor.
- the assembly may further include a plurality of pressure sensors, and torque applied to the electrode tip portion may be determinable as a function of a voltage output signal of each pressure sensor respectively divided by the predetermined sensitivity of each pressure sensor, and a distance of the pressure sensors from a central axis of the electrode.
- the generally distal end of the catheter may include a coupling member connecting the electrode to the catheter body.
- the coupling member may include an elastic material.
- the pressure sensors may be emplaced in an interface between two or more annular or circular rings.
- the tip portion of the electrode may include an irrigation port.
- the electrode may include an RF ablation electrode, a HIFU ablation transducer, a laser ablation assembly, a cryogenic ablation assembly, an ultrasonic imaging apparatus, an electrical cardiac pacing electrode, or an electrical cardiac sensing electrode.
- the pressure sensors may be fabricated using flex circuit technology, lithographic technology, thin-film technology, and/or thick film technology.
- the assembly may further include a proximal control handle including one or more catheter deflection or articulation controls, and one or more switches for controlling a diagnostic or therapeutic function of the electrode.
- the force applied to the electrode tip may be utilized for automatically limiting a maximum force, warning of a high or unacceptable force, giving visual or audible feedback to a practitioner regarding a tissue contact force, warning of a loss of contact force or contact, and/or warning of a contact force which may be too low.
- a system for assessing a degree of coupling between an electrode and a tissue in a body may include a contact sensing assembly including a catheter including a body having a proximal end and a distal end, and an electrode including a tip portion and a base portion mounted adjacent a head portion of the catheter body.
- One or more sensors may be disposed generally adjacent the base portion for measuring compression or tensile forces applied to the electrode tip portion and providing an output signal related to the measured forces, with the sensor including a predetermined sensitivity.
- the base and head portions may include a predetermined rigidity so that the compression or tensile forces applied to the electrode tip portion are determinable as a function of the predetermined sensitivity and the output signal.
- the assembly may include a plurality of sensors, and the individual sensors each generate an output signal that together provide a vector reconstruction of a net tip contact force using a vector addition algorithm or relationship.
- the assembly may include a plurality of sensors, and the compression or tensile forces applied to the electrode tip portion may be determinable as a sum of the output signals of each sensor respectively divided by the predetermined sensitivity of each sensor.
- the assembly may include a plurality of sensors, and torque applied to the electrode tip portion may be determinable as a function of the output signal of each sensor respectively divided by the predetermined sensitivity of each sensor, and a distance of the sensors from a central axis of the electrode.
- the generally distal end of the catheter may include a coupling member connecting the electrode to the catheter body.
- the coupling member includes an elastic material.
- the sensors may be emplaced in an interface between two or more annular or circular rings.
- the tip portion of the electrode may include an irrigation port.
- the electrode may include an RF ablation electrode, a HIFU ablation transducer, a laser ablation apparatus, a cryogenic ablation assembly, an ultrasonic imaging transducer, a cardiac pacing electrode, or a cardiac sensing electrode.
- the sensors may be fabricated using flex circuit technology, lithographic technology, thin-film technology, and/or thick film technology.
- the assembly may include a proximal control handle including one or more catheter deflection or articulation controls, and one or more switches for controlling a diagnostic or therapeutic function of the electrode.
- the compression or tensile force applied to the electrode tip may be utilized for automatically limiting a maximum force, warning of a high or unacceptable force, giving visual or audible feedback to a practitioner regarding a tissue contact force, warning of a loss of contact force or contact, and/or warning of a contact force which may be too low.
- the sensor may be a resistive force sensor, a capacitive force sensor, or an optical force sensor.
- a system for assessing a degree of coupling between an electrode and a tissue in a body may include a contact sensing assembly including a catheter having a body having a proximal end and a distal end, an electrode pipe disposed in the catheter body, and an electrode wire disposed in the electrode pipe and including isolation thereon.
- a change in capacitance resulting from movement of the electrode wire toward the electrode pipe or contact of the electrode wire with the electrode pipe during bending of the catheter may directly correlate to a force applied to the catheter.
- the electrode wire and electrode pipe may be mechanically coupled toward a distal end thereof
- An electrode operatively connected to the catheter may include an RF ablation electrode, a HIFU ablation transducer, a laser ablation apparatus, a cryogenic ablation assembly, an ultrasonic imaging transducer, a cardiac pacing electrode, or a cardiac sensing electrode.
- the assembly may further include a proximal control handle including one or more catheter deflection or articulation controls, and one or more switches for controlling a diagnostic or therapeutic function of an electrode operatively connected to the catheter.
- the compression or tensile force applied to the electrode tip may be utilized for automatically limiting a maximum force, warning of a high or unacceptable force, giving visual or audible feedback to a practitioner regarding a tissue contact force, warning of a loss of contact force or contact, and/or warning of a contact force which may be too low.
- a system for assessing a degree of coupling between an electrode and a tissue in a body may include a contact sensing assembly including a catheter having a body having a proximal end and a distal end, an electrode pipe operatively connected to the catheter body for movement and/or bending with the catheter body, and an electrode wire disposed in the electrode pipe and including isolation thereon.
- a change in capacitance resulting from movement of the electrode wire toward the electrode pipe or contact of the electrode wire with the electrode pipe during bending of the catheter may directly correlate to a force applied to the catheter.
- FIG. 1 is a partial perspective view of a catheter assembly in accordance with an embodiment of the invention
- FIG. 2 is an isometric diagrammatic view of an electrode area according to the invention, illustrating exemplary force and torque sensors
- FIG. 3 is a top view of the electrode area of FIG. 2 , with the electrode removed for clarity;
- FIG. 4 is a partial diagrammatic view of a catheter assembly in accordance with another embodiment of the invention.
- FIGS. 5 a - 5 d are partial isometric diagrammatic views of a catheter structure in accordance with another embodiment of the invention.
- FIGS. 6 a - 6 f are schematic overviews of a system for measuring force and torque in accordance with alternate embodiments of the invention.
- FIG. 1 illustrates an exemplary embodiment of a contact sensing assembly 10 as provided by the invention.
- contact sensing assembly 10 may include a catheter 12 , an electrode 14 connected to the catheter, and a force and torque sensor 16 for interacting with base 18 of electrode 14 or alternatively with head 20 of catheter body 22 if sensor 16 is mounted on base 18 .
- contact sensing assembly 10 may include a first interactive component and a second interactive component. The contact sensing assembly may be used in the diagnosis, visualization, and/or treatment of tissue (such as endocardial tissue) in a body.
- Contact sensing assembly 10 may be used in a number of diagnostic and therapeutic applications, such as for example, the recording of electrograms in the heart, the performance of cardiac ablation procedures, and/or various other applications.
- the catheter assembly can be used in connection with a number of applications that involve humans, or other mammals, for tissue observation, treatment, repair or other procedures.
- the invention is not limited to one particular application, but rather may be employed by those of ordinary skill in the art in any number of diagnostic and therapeutic applications, and for medical or non-medical purposes.
- the contact sensing assemblies disclosed herein may be usable in combination with a robotic catheter system (e.g.
- catheter 12 of the invention may include body 22 having a distal end 24 and a proximal end 26 .
- Body 22 of catheter 12 is generally tubular in shape, although other configurations of the catheter may be used as known in the industry.
- the outer portion of catheter 12 may have a braided outer covering therein providing increased flexibility and strength.
- the catheters of the invention vary in length and are attached to a handle or other type of control member that allows a surgeon or operator of the catheter to manipulate the relative position of the catheter within the body from a remote location, as recognized by one of ordinary skill in the art.
- body 22 of catheter 12 may generally include sensors 28 , 30 , 32 of force and torque sensor 16 mounted on head 20 in a tri-axial arrangement.
- sensors 28 , 30 , 32 may be generally located between a “neck” area of electrode 14 and a support portion on the body.
- the body of electrode 14 particularly near base 18 and the area of body 22 adjacent head 20 , may be sufficiently rigid to permit any forces (axial or transverse) applied to distal end 24 to be measured by force and torque sensor 16 .
- the sensor arrangement of FIGS. 2 and 3 may specifically measure force along the electrode axis F z , and two components of torque in a plane perpendicular to the electrode axis, namely T x and T y . If needed, the force in the x and y directions may be determined from the torque components.
- all three sensors 28 , 30 , 32 may be presumed to have the same sensitivity “ ⁇ ” ( ⁇ is the proportionality constant between force applied to a sensor and the sensor's electrical output, and represents a predetermined value for each sensor).
- ⁇ is the proportionality constant between force applied to a sensor and the sensor's electrical output, and represents a predetermined value for each sensor.
- sensors 28 , 32 may measure a negative (e.g. tensile) force
- sensor 30 would measure a positive (e.g. compression) force
- force and torque sensor 16 determining the force in the z-direction based on the respective measurements at each sensor 28 , 30 , 32 .
- the force/torque components may be given by the following equations:
- T — y sqrt(3)/(2* ⁇ )* D *( V — c ⁇ V — a/ 2 ⁇ V — b/ 2)
- T — x sqrt(3)/(2* ⁇ )* D *( V — a ⁇ V — b ),
- D is the diameter of circle 34 in the x-y plane passing through the centers of sensors 28 , 30 , 32 .
- each sensor 28 , 30 , 32 has a different sensitivity ⁇ (e.g. ⁇ _a, ⁇ _b, ⁇ _c), then the sensor outputs would be:
- V —a ⁇ _aF_a
- V_b ⁇ _bF_b
- V_c ⁇ — cF _c.
- T — y 3 ⁇ 4 *D* ( V — c/a — c ⁇ V — a/a ⁇ C — b/a — b ), and
- T — x sqrt(3)/2 *D* ( V — a/a — a ⁇ V — b/a — b )
- the sensor arrangement of FIGS. 2 and 3 may specifically measure force along the electrode axis F z , and two components of torque in the plane perpendicular to the electrode axis, namely T x and T y , with the force and torque being determined as discussed above.
- electrode 14 and body 22 may optionally be connected by an elastic hermetic neck, with elastic hermetic neck 38 further allowing only predetermined relative movement of electrode 14 and body 22 , and thus force and torque determination by sensors 28 , 30 , 32 .
- neck 38 is illustrated as including ridges, neck 38 may optionally be a smooth structure, or another elastic coupling element such as those disclosed in commonly owned and copending application titled “Optic-Based Contact Sensing Assembly and System.”
- force and torque sensor 16 provides feedback on the amount of force of electrode 14 onto a tissue (e.g. F z ), as well as the torque applied to electrode 14 (e.g. T x and T y ).
- FIGS. 5 a - 5 d another embodiment of a system and method for measuring force applied to the tip of an electrode, namely contact sensing assembly 100 , will be described in detail.
- contact sensing assembly 100 of FIGS. 5 a - 5 d may estimate the lateral (x-y) force of an electrode tip (e.g. electrode 14 ) onto tissue (e.g. heart or other tissue) from the bending curvature of a catheter 102 near the tip of an electrode.
- tissue e.g. heart or other tissue
- Such a sensor of curvature may be either resistive or capacitive.
- an inner electrode wire 104 (made for example of stainless steel) may be disposed inside a coaxial outer electrode pipe 106 , with wire 104 and electrode pipe 106 being mechanically connected at bottom area 108 .
- Outer electrode pipe 106 may be made of a flexible plastic, with the interior surface thereof covered with a thin metal film (e.g. gold).
- Electrode wire 104 may be covered with a thin layer of isolation 110 made of, for example, Teflon®, to prevent shorts, and may also include isolation at the mechanical coupling at bottom area 108 .
- Outer electrode pipe 106 may be mechanically coupled to catheter body 112 so that they both bend similarly.
- the capacitance may be directly correlated to the amount of force being applied to catheter body 112 .
- a capacitance factor may be provided to determine the amount of force being applied to the catheter body based on measured capacitance.
- contact sensing assembly 100 may be either resistive or capacitive.
- a resistive solution may be injected inside electrode pipe 106 and anti-short standoffs (not shown) may be used instead of isolation 110 .
- the resistive solution such as saline, may be used to fill assembly 100 right before or during surgery.
- contact sensing assembly 100 provides feedback on the amount of force of an electrode (e.g. electrode 14 ) onto tissue.
- sensors 28 , 30 , 32 may be positioned differently than the arrangement of FIGS. 2 and 3 (e.g. asymmetrically relative to the central axis of the electrode), or the sensors may be positioned so that their axes of sensitivity are not parallel to the electrode central axis.
- electrode 14 may also be configured to include a means for irrigating.
- a means for irrigating for example, without limitation, as shown in FIG. 1 , the incorporation of at least one irrigation port 36 within electrode 14 may provide an irrigated electrode tip.
- An irrigated electrode tip allows for the cooling of electrode 14 , for instance, through the transporting of fluid through electrode 14 and around the surface of the tissue.
- a number of different types of electrodes, irrigated and non-irrigated may be connected and incorporated for use of an electrode 14 according to embodiments of the invention depending on the type of procedures being done.
- Such irrigated electrodes include, but are not limited to, those disclosed in U.S. patent application Ser. Nos.
- the invention further discloses a force-based catheter system 200 , as shown in FIGS. 6A-6F , that includes assemblies 10 or 100 (note: only assembly 10 illustrated) of the invention connected to a signal converter 210 (such as an analog to digital converter) and an operator interface 220 , which may further include a computer and display, for processing the force signals received from assemblies 10 or 100 in connection with positioning and contact with tissue, such as myocardial tissue 205 .
- This force-based information is processed to determine the contact force exerted on electrode 14 or the electrode for assembly 100 .
- a calibration system 230 i.e., calibration software
- a mapping system 240 such as the Ensite system, also known as NavX®, may be integrated with system 200 to provide a visualization and mapping system for use in connection with assemblies 10 or 100 of the invention.
- signal converter 210 may be integrated with assemblies 10 , 100 , such that the force or torque signal is directly processed and provided on operator interface 220 .
- each of these components may be modified and/or integrated with one another depending on the design of the force/torque system as recognized by one of ordinary skill in the art.
- joinder references do not necessarily infer that two elements are directly connected and in fixed relation to each other. It is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative only and not as limiting. Changes in detail or structure may be made without departing from the invention as defined in the appended claims.
Abstract
Description
- This application is a continuation of U.S. application Ser. No. 12/347,607, filed 31 Dec. 2008, now pending, which is hereby incorporated by reference as though fully set forth herein.
- a. Field of the Invention
- This invention relates to a system and method for assessing the force and torque between an electrode and tissue in a body. In particular, the instant invention relates to a system and method for assessing the force and torque between an electrode tip on a diagnostic and/or therapeutic medical device such as a mapping or ablation catheter and tissue, such as cardiac tissue. The instant invention also relates to a method for sensing and calculating contact force exerted by another component on a tissue, and generally, a method for sensing and calculating contact force on an elongate member when in contact with another component or structure, for medical or non-medical purposes.
- b. Background Art
- Electrodes are used on a variety of diagnostic and/or therapeutic medical devices. For example, electrodes may be used on cardiac mapping catheters to generate an image of the internal geometry of a heart and electrical potentials within the tissue. Electrodes are also used on ablation catheters to create tissue necrosis in cardiac tissue to correct conditions such as atrial arrhythmia (including, but not limited to, ectopic atrial tachycardia, atrial fibrillation, and atrial flutter). Arrhythmia can create a variety of dangerous conditions including irregular heart rates, loss of synchronous atrioventricular contractions and stasis of blood flow which can lead to a variety of ailments and even death. It is believed that the primary cause of atrial arrhythmia is stray electrical signals within the left or right atrium of the heart. The ablation catheter imparts ablative energy (e.g., radiofrequency energy, cryoablation, lasers, chemicals, high-intensity focused ultrasound, etc.) to cardiac tissue to create a lesion in the cardiac tissue. This lesion disrupts undesirable electrical pathways and thereby limits or prevents stray electrical signals that lead to arrhythmias.
- The safety and effectiveness of many of diagnostic and/or therapeutic devices is often determined in part by the proximity of the device and the electrodes to the target tissue. In mapping catheters, the distance between the electrodes and the target tissue affects the strength of the electrical signal and the identity of the mapping location. The safety and effectiveness of ablation lesions is determined in part by the proximity of the ablation electrode to target tissue and the effective application of energy to that tissue. If the electrode is too far from the tissue or has insufficient contact with the tissue, the lesions created may not be effective. On the other hand, if the catheter tip containing the electrode contacts the tissue with excessive force, the catheter tip may perforate or otherwise damage the tissue (e.g., by overheating). Therefore, to successfully ablate live tissue, the electrode should be applied to the tissue with proper force. When ablating and moving an electrode, in addition to the magnitude of the force, knowledge of direction of the force (i.e. multi-axial measurement) and further the torque acting on the electrode tip are important for estimating the distribution of pressure and stress over an electrode tip surface.
- Contact force between a catheter electrode and tissue has typically been determined using one or more of the following methods: clinician sense, fluoroscopic imaging, intracardiac echo (ICE), atrial electrograms (typically bipolar D-2), pacing thresholds, evaluation of lesion size at necropsy and measurement of temperature change at the energy delivery site. Each of these methods has disadvantages, however.
- For example, although a clinician can evaluate contact force based on tactile feedback from the catheter and prior experience, the determination depends largely on the experience of the clinician and is also subject to change based on variations in the mechanical properties of catheters used by the clinician. The determination is particularly difficult when using catheters that are relatively long (such as those used to enter the left atria of the heart).
- Because fluoroscopic images are two-dimensional projections and blood and myocardium attenuate x-rays similarly, it can be difficult to quantify the degree of contact force and detect when the catheter tip is not in contact with the tissue.
- Intracardiac echo can be time consuming and it can be difficult to align the echo beam with the ablation catheter. Further, intracardiac echo does not always permit the clinician to confidently assess the degree of contact and can generate unacceptable levels of false positives and false negatives in assessing whether the electrode is in contact with tissue.
- Atrial electrograms do not always correlate well to tissue contact and are also prone to false negatives and positives. Pacing thresholds also do not always correlate well with tissue contact and pacing thresholds can be time-consuming and also prone to false positives and negatives because tissue excitability may vary in hearts with arrhythmia. Evaluating lesion size at necropsy is seldom available in human subjects, provides limited information (few data points) and, further, it is often difficult to evaluate the depth and volume of lesions in the left and right atria. Finally, temperature measurements provide limited information (few data points) and can be difficult to evaluate in the case of irrigated catheters.
- The inventors herein have thus recognized a need for a system and method for determining the contact force and torque upon an electrode tip, both during RF ablation and when driving the RF electrode to the ablation site, that will minimize and/or eliminate one or more of the above-identified deficiencies.
- It is desirable to provide a system and method for determining the degree of coupling between an electrode and a tissue in a body. In particular, it is desirable to be able to determine a degree of electrical coupling between electrodes on a diagnostic and/or therapeutic medical device such as a mapping or ablation catheter and tissue, such as cardiac tissue.
- A system for assessing a degree of coupling between an electrode and a tissue in a body in accordance with one embodiment of the invention may include a contact sensing assembly including a catheter having a body having a proximal end and a distal end, and an electrode including a tip portion and a base portion mounted adjacent a head portion of the catheter body. One or more force and torque sensors may be disposed generally adjacent the base portion and may include one or more pressure sensors for measuring pressure applied to the electrode tip portion and providing a pressure signal related to the measured pressure, with the pressure sensor including a predetermined sensitivity. The base and head portions may include a predetermined rigidity so that force applied to the electrode tip portion may be determinable as a function of the predetermined sensitivity and the pressure signal.
- For the assembly described above, in an embodiment, the assembly may include a plurality of pressure sensors, and the individual pressure sensor output signals allow a vector reconstruction of a net tip contact force using a vector addition algorithm or relationship. In an embodiment, the assembly may further include a plurality of pressure sensors, and the force applied to the electrode tip portion may be determinable as a sum of a voltage output signal of each pressure sensor respectively divided by the predetermined sensitivity of each pressure sensor. In an embodiment, the assembly may further include a plurality of pressure sensors, and torque applied to the electrode tip portion may be determinable as a function of a voltage output signal of each pressure sensor respectively divided by the predetermined sensitivity of each pressure sensor, and a distance of the pressure sensors from a central axis of the electrode.
- For the assembly described above, in an embodiment, the assembly may include three symmetrically disposed pressure sensors, and for an electrode having a central axis disposed along a z-direction, torque applied to the electrode tip portion may be determinable as follows: T_y=¾*D*(V_c/α_c−V_a/α_a−V_b/α_b), where T_y may be the torque applied to the electrode tip portion in a y-direction, D may be a diameter of a circle passing through the centers of each pressure sensor, V may be a voltage output of each respective pressure sensor, and α may be the predetermined sensitivity of each respective pressure sensor. In an embodiment, the assembly may include three symmetrically disposed pressure sensors, and for an electrode having a central axis disposed along a z-direction, torque applied to the electrode tip portion may be determinable as follows: T_x=sqrt(3)/2*D*(V_a/α_a−V_b/α_b), where T_x may be the torque applied to the electrode tip portion in a x-direction, D may be a diameter of a circle passing through the centers of each pressure sensor, V may be a voltage output of each respective pressure sensor, and a may be the predetermined sensitivity of each respective pressure sensor.
- For the assembly described above, in an embodiment, the generally distal end of the catheter may include a coupling member connecting the electrode to the catheter body. In an embodiment, the coupling member may include an elastic material. In an embodiment, the pressure sensors may be emplaced in an interface between two or more annular or circular rings. In an embodiment, the tip portion of the electrode may include an irrigation port. The electrode may include an RF ablation electrode, a HIFU ablation transducer, a laser ablation assembly, a cryogenic ablation assembly, an ultrasonic imaging apparatus, an electrical cardiac pacing electrode, or an electrical cardiac sensing electrode. The pressure sensors may be fabricated using flex circuit technology, lithographic technology, thin-film technology, and/or thick film technology. In an embodiment, the assembly may further include a proximal control handle including one or more catheter deflection or articulation controls, and one or more switches for controlling a diagnostic or therapeutic function of the electrode. The force applied to the electrode tip may be utilized for automatically limiting a maximum force, warning of a high or unacceptable force, giving visual or audible feedback to a practitioner regarding a tissue contact force, warning of a loss of contact force or contact, and/or warning of a contact force which may be too low.
- In an embodiment, a system for assessing a degree of coupling between an electrode and a tissue in a body may include a contact sensing assembly including a catheter including a body having a proximal end and a distal end, and an electrode including a tip portion and a base portion mounted adjacent a head portion of the catheter body. One or more sensors may be disposed generally adjacent the base portion for measuring compression or tensile forces applied to the electrode tip portion and providing an output signal related to the measured forces, with the sensor including a predetermined sensitivity. The base and head portions may include a predetermined rigidity so that the compression or tensile forces applied to the electrode tip portion are determinable as a function of the predetermined sensitivity and the output signal.
- For the assembly described above, in an embodiment, the assembly may include a plurality of sensors, and the individual sensors each generate an output signal that together provide a vector reconstruction of a net tip contact force using a vector addition algorithm or relationship. In an embodiment, the assembly may include a plurality of sensors, and the compression or tensile forces applied to the electrode tip portion may be determinable as a sum of the output signals of each sensor respectively divided by the predetermined sensitivity of each sensor. In an embodiment, the assembly may include a plurality of sensors, and torque applied to the electrode tip portion may be determinable as a function of the output signal of each sensor respectively divided by the predetermined sensitivity of each sensor, and a distance of the sensors from a central axis of the electrode.
- For the assembly described above, in an embodiment, the assembly may include three symmetrically disposed sensors, and for an electrode having a central axis disposed along a z-direction, torque applied to the electrode tip portion may be determinable as follows: T_y=¾*D*(V_c/α_c−V_a/α_a−V_b/α_b), where T_y may be the torque applied to the electrode tip portion in a y-direction, D may be a diameter of a circle passing through the centers of each sensor, V may be a voltage output of each respective sensor, and α may be the predetermined sensitivity of each respective sensor. In an embodiment, the assembly may include three symmetrically disposed sensors, and for an electrode having a central axis disposed along a z-direction, torque applied to the electrode tip portion may be determinable as follows: T_x=sqrt(3)/2*D*(V_a/α_a−V_b/α_b), where T_x may be the torque applied to the electrode tip portion in a x-direction, D may be a diameter of a circle passing through the centers of each sensor, V may be a voltage output of each respective sensor, and a may be the predetermined sensitivity of each respective sensor.
- For the assembly described above, in an embodiment, the generally distal end of the catheter may include a coupling member connecting the electrode to the catheter body. In an embodiment, the coupling member includes an elastic material. In an embodiment, the sensors may be emplaced in an interface between two or more annular or circular rings. In an embodiment, the tip portion of the electrode may include an irrigation port. The electrode may include an RF ablation electrode, a HIFU ablation transducer, a laser ablation apparatus, a cryogenic ablation assembly, an ultrasonic imaging transducer, a cardiac pacing electrode, or a cardiac sensing electrode. The sensors may be fabricated using flex circuit technology, lithographic technology, thin-film technology, and/or thick film technology. In an embodiment, the assembly may include a proximal control handle including one or more catheter deflection or articulation controls, and one or more switches for controlling a diagnostic or therapeutic function of the electrode. The compression or tensile force applied to the electrode tip may be utilized for automatically limiting a maximum force, warning of a high or unacceptable force, giving visual or audible feedback to a practitioner regarding a tissue contact force, warning of a loss of contact force or contact, and/or warning of a contact force which may be too low. The sensor may be a resistive force sensor, a capacitive force sensor, or an optical force sensor.
- In an embodiment, a system for assessing a degree of coupling between an electrode and a tissue in a body may include a contact sensing assembly including a catheter having a body having a proximal end and a distal end, an electrode pipe disposed in the catheter body, and an electrode wire disposed in the electrode pipe and including isolation thereon. A change in capacitance resulting from movement of the electrode wire toward the electrode pipe or contact of the electrode wire with the electrode pipe during bending of the catheter may directly correlate to a force applied to the catheter.
- For the assembly described above, in an embodiment, the electrode wire and electrode pipe may be mechanically coupled toward a distal end thereof An electrode operatively connected to the catheter may include an RF ablation electrode, a HIFU ablation transducer, a laser ablation apparatus, a cryogenic ablation assembly, an ultrasonic imaging transducer, a cardiac pacing electrode, or a cardiac sensing electrode. In an embodiment, the assembly may further include a proximal control handle including one or more catheter deflection or articulation controls, and one or more switches for controlling a diagnostic or therapeutic function of an electrode operatively connected to the catheter. The compression or tensile force applied to the electrode tip may be utilized for automatically limiting a maximum force, warning of a high or unacceptable force, giving visual or audible feedback to a practitioner regarding a tissue contact force, warning of a loss of contact force or contact, and/or warning of a contact force which may be too low.
- In an embodiment, a system for assessing a degree of coupling between an electrode and a tissue in a body may include a contact sensing assembly including a catheter having a body having a proximal end and a distal end, an electrode pipe operatively connected to the catheter body for movement and/or bending with the catheter body, and an electrode wire disposed in the electrode pipe and including isolation thereon. A change in capacitance resulting from movement of the electrode wire toward the electrode pipe or contact of the electrode wire with the electrode pipe during bending of the catheter may directly correlate to a force applied to the catheter.
- The foregoing and other aspects, features, details, utilities and advantages of the invention will be apparent from reading the following description and claims, and from reviewing the accompanying drawings.
-
FIG. 1 is a partial perspective view of a catheter assembly in accordance with an embodiment of the invention; -
FIG. 2 is an isometric diagrammatic view of an electrode area according to the invention, illustrating exemplary force and torque sensors; -
FIG. 3 is a top view of the electrode area ofFIG. 2 , with the electrode removed for clarity; -
FIG. 4 is a partial diagrammatic view of a catheter assembly in accordance with another embodiment of the invention; -
FIGS. 5 a-5 d are partial isometric diagrammatic views of a catheter structure in accordance with another embodiment of the invention; and -
FIGS. 6 a-6 f are schematic overviews of a system for measuring force and torque in accordance with alternate embodiments of the invention. - Referring now to the drawings wherein like reference numerals are used to identify like components in the various views,
FIG. 1 illustrates an exemplary embodiment of acontact sensing assembly 10 as provided by the invention. In a general form, referring toFIGS. 1 and 2 ,contact sensing assembly 10 may include acatheter 12, anelectrode 14 connected to the catheter, and a force andtorque sensor 16 for interacting withbase 18 ofelectrode 14 or alternatively withhead 20 ofcatheter body 22 ifsensor 16 is mounted onbase 18. In another embodiment,contact sensing assembly 10 may include a first interactive component and a second interactive component. The contact sensing assembly may be used in the diagnosis, visualization, and/or treatment of tissue (such as endocardial tissue) in a body.Contact sensing assembly 10 may be used in a number of diagnostic and therapeutic applications, such as for example, the recording of electrograms in the heart, the performance of cardiac ablation procedures, and/or various other applications. The catheter assembly can be used in connection with a number of applications that involve humans, or other mammals, for tissue observation, treatment, repair or other procedures. Moreover, the invention is not limited to one particular application, but rather may be employed by those of ordinary skill in the art in any number of diagnostic and therapeutic applications, and for medical or non-medical purposes. For example, the contact sensing assemblies disclosed herein may be usable in combination with a robotic catheter system (e.g. disclosed in commonly owned and copending applications titled “Robotic Catheter System,” “Robotic Catheter Manipulator Assembly,” “Robotic Catheter Device Cartridge,” “Robotic Catheter Rotatable Device Cartridge,” “Robotic Catheter Input Device,” “Robotic Catheter System Including Haptic Feedback,” and “Robotic Catheter System with Dynamic Response,” the respective disclosures of which are incorporated herein by reference in their entirety), for example, for coupling to a computer controlled catheter or surgical instrument for real-time feedback and precise control during a procedure. - Referring to
FIGS. 1-4 ,catheter 12 of the invention may includebody 22 having adistal end 24 and aproximal end 26.Body 22 ofcatheter 12 is generally tubular in shape, although other configurations of the catheter may be used as known in the industry. If desired, the outer portion ofcatheter 12 may have a braided outer covering therein providing increased flexibility and strength. The catheters of the invention vary in length and are attached to a handle or other type of control member that allows a surgeon or operator of the catheter to manipulate the relative position of the catheter within the body from a remote location, as recognized by one of ordinary skill in the art. - An embodiment of a system and method for measuring force and torque applied to the tip of
electrode 14, namely contactsensing assembly 10, will now be described in detail. - As shown in
FIG. 3 ,body 22 ofcatheter 12 may generally includesensors torque sensor 16 mounted onhead 20 in a tri-axial arrangement. Alternatively,sensors electrode 14 and a support portion on the body. The body ofelectrode 14, particularly nearbase 18 and the area ofbody 22adjacent head 20, may be sufficiently rigid to permit any forces (axial or transverse) applied todistal end 24 to be measured by force andtorque sensor 16. The sensor arrangement ofFIGS. 2 and 3 may specifically measure force along the electrode axis Fz, and two components of torque in a plane perpendicular to the electrode axis, namely Tx and Ty. If needed, the force in the x and y directions may be determined from the torque components. - The method of calculating force and torque from
sensors - Without loss of generality, all three
sensors sensors torque sensor 16 only measures forces in the z-direction. Namely, if a force is applied in the y-direction inFIG. 2 , whilesensors sensor 30 would measure a positive (e.g. compression) force, with force andtorque sensor 16 determining the force in the z-direction based on the respective measurements at eachsensor - The force/torque components may be given by the following equations:
-
F — z=(V_a+V— b+V — c)/α, -
T — y=sqrt(3)/(2*α)*D*(V — c−V — a/2−V — b/2), and -
T — x=sqrt(3)/(2*α)*D*(V — a−V — b), - where “D” is the diameter of
circle 34 in the x-y plane passing through the centers ofsensors - If each
sensor -
V—a=α_aF_a, V_b=α_bF_b,V_c=α— cF_c. - The force and torque components may be given by the following equations:
-
F — z=V — a/a — a+C — b/a — b+V — c/a — c, -
T — y=¾*D*(V — c/a — c−V — a/a−C — b/a — b), and -
T — x=sqrt(3)/2*D*(V — a/a — a−V — b/a — b) - Thus the sensor arrangement of
FIGS. 2 and 3 may specifically measure force along the electrode axis Fz, and two components of torque in the plane perpendicular to the electrode axis, namely Tx and Ty, with the force and torque being determined as discussed above. - Referring to
FIG. 4 ,electrode 14 andbody 22 may optionally be connected by an elastic hermetic neck, with elastichermetic neck 38 further allowing only predetermined relative movement ofelectrode 14 andbody 22, and thus force and torque determination bysensors neck 38 is illustrated as including ridges,neck 38 may optionally be a smooth structure, or another elastic coupling element such as those disclosed in commonly owned and copending application titled “Optic-Based Contact Sensing Assembly and System.” - Thus by measuring the z-directional forces applied to each
sensor torque sensor 16 provides feedback on the amount of force ofelectrode 14 onto a tissue (e.g. Fz), as well as the torque applied to electrode 14 (e.g. Tx and Ty). - Referring next to
FIGS. 5 a-5 d, another embodiment of a system and method for measuring force applied to the tip of an electrode, namely contactsensing assembly 100, will be described in detail. - Generally,
contact sensing assembly 100 ofFIGS. 5 a-5 d may estimate the lateral (x-y) force of an electrode tip (e.g. electrode 14) onto tissue (e.g. heart or other tissue) from the bending curvature of acatheter 102 near the tip of an electrode. Such a sensor of curvature may be either resistive or capacitive. If capacitive, an inner electrode wire 104 (made for example of stainless steel) may be disposed inside a coaxialouter electrode pipe 106, withwire 104 andelectrode pipe 106 being mechanically connected atbottom area 108.Outer electrode pipe 106 may be made of a flexible plastic, with the interior surface thereof covered with a thin metal film (e.g. gold).Electrode wire 104 may be covered with a thin layer ofisolation 110 made of, for example, Teflon®, to prevent shorts, and may also include isolation at the mechanical coupling atbottom area 108.Outer electrode pipe 106 may be mechanically coupled tocatheter body 112 so that they both bend similarly. - In operation, as shown in
FIG. 5 c, whenelectrode pipe 106 bends together withcatheter body 112, the capacitance betweenelectrode wire 104 andelectrode pipe 106 increases as electrode wire 104 (which has isolation thereon) begins to move towardelectrode pipe 106. As shown inFIG. 5 d, aselectrode pipe 106 bends more together withcatheter body 112, the contact area betweenelectrode wire 104 andelectrode pipe 106 increases, to thus further increase the capacitance betweenelectrode wire 104 andelectrode pipe 106. The increase in capacitance is measured and correlated to the amount of force on the tip of the electrode (e.g. electrode 14) based on the degree of bending ofcatheter body 112. For example, for a catheter body having a predetermined flexibility based on the application of a predetermined force, the capacitance may be directly correlated to the amount of force being applied tocatheter body 112. Likewise, for any given catheter body having a predetermined flexibility based on the application of a predetermined force, a capacitance factor may be provided to determine the amount of force being applied to the catheter body based on measured capacitance. - As discussed above,
contact sensing assembly 100 may be either resistive or capacitive. For anassembly 100 based on changes in resistivity, a resistive solution may be injected insideelectrode pipe 106 and anti-short standoffs (not shown) may be used instead ofisolation 110. The resistive solution, such as saline, may be used to fillassembly 100 right before or during surgery. - Thus by measuring the change in capacitance or resistivity between
inner electrode wire 104 andouter electrode pipe 106,contact sensing assembly 100 provides feedback on the amount of force of an electrode (e.g. electrode 14) onto tissue. - Those skilled in the art would appreciate in view of this disclosure that various modifications may be made to the aforementioned force and torque sensors without departing from the scope of the invention.
- For example, for force and
torque sensor 16, more components of force and torque may be measured by usingmore sensors Sensors FIGS. 2 and 3 (e.g. asymmetrically relative to the central axis of the electrode), or the sensors may be positioned so that their axes of sensitivity are not parallel to the electrode central axis. - Further,
electrode 14 may also be configured to include a means for irrigating. For example, without limitation, as shown inFIG. 1 , the incorporation of at least oneirrigation port 36 withinelectrode 14 may provide an irrigated electrode tip. An irrigated electrode tip allows for the cooling ofelectrode 14, for instance, through the transporting of fluid throughelectrode 14 and around the surface of the tissue. A number of different types of electrodes, irrigated and non-irrigated, may be connected and incorporated for use of anelectrode 14 according to embodiments of the invention depending on the type of procedures being done. Such irrigated electrodes include, but are not limited to, those disclosed in U.S. patent application Ser. Nos. 11/434,220 (filed May 16, 2006), 10/595,608 (filed Apr. 28, 2006), 11/646,270 (filed Dec. 28, 2006) 11/647,346 (filed Dec. 29, 2006) and 60/828,955 (filed Oct. 10, 2006), each of which is hereby incorporated by reference as though fully set forth herein. - The invention further discloses a force-based
catheter system 200, as shown inFIGS. 6A-6F , that includesassemblies 10 or 100 (note: only assembly 10 illustrated) of the invention connected to a signal converter 210 (such as an analog to digital converter) and anoperator interface 220, which may further include a computer and display, for processing the force signals received fromassemblies myocardial tissue 205. This force-based information is processed to determine the contact force exerted onelectrode 14 or the electrode forassembly 100. A calibration system 230 (i.e., calibration software) may be further provided to readily correlate the pressure or capacitance measurements to the external force or torque on the electrode. Amapping system 240, such as the Ensite system, also known as NavX®, may be integrated withsystem 200 to provide a visualization and mapping system for use in connection withassemblies FIGS. 6D-6F ,signal converter 210 may be integrated withassemblies operator interface 220. Overall, each of these components may be modified and/or integrated with one another depending on the design of the force/torque system as recognized by one of ordinary skill in the art. - Although several embodiments of this invention have been described above with a certain degree of particularity, those skilled in the art could make numerous alterations to the disclosed embodiments without departing from the scope of this invention. All directional references (e.g., upper, lower, upward, downward, left, right, leftward, rightward, top, bottom, above, below, vertical, horizontal, clockwise and counterclockwise) are only used for identification purposes to aid the reader's understanding of the invention, and do not create limitations, particularly as to the position, orientation, or use of the invention. Joinder references (e.g., attached, coupled, connected, and the like) are to be construed broadly and may include intermediate members between a connection of elements and relative movement between elements. As such, joinder references do not necessarily infer that two elements are directly connected and in fixed relation to each other. It is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative only and not as limiting. Changes in detail or structure may be made without departing from the invention as defined in the appended claims.
Claims (28)
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US20100168620A1 (en) | 2010-07-01 |
US8864757B2 (en) | 2014-10-21 |
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