US20080228265A1 - Tissue anchors, systems and methods, and devices - Google Patents

Abstract

Systems, devices and methods for securing tissue including the annulus of a mitral valve. The systems, devices and methods may employ catheter based techniques and devices to plicate tissue and perform an annuloplasty.

Description

TECHNICAL FIELD
• The present invention relates generally to tissue fastening and, more particularly, tissue fastening performed in a minimally invasive and percutaneous manner.
BACKGROUND
• Referring initially toFIGS. 1-4 solely for purposes of understanding the anatomy of a heart10, and specifically the left side of the heart10, the left atrium (LA)12 and left ventricle (LV)14 are shown. Anaorta16 receives oxygenated blood fromleft ventricle14 through anaortic valve18, which serves to prevent regurgitation of blood back intoleft ventricle14. Amitral valve20 is positioned betweenleft atrium12 andleft ventricle14, and allows one-way flow of the oxygenated blood from theleft atrium12 to theleft ventricle14.
• Mitral valve20, which will be described below in more detail, includes ananterior leaflet22 and aposterior leaflet24 that are coupled to cordae tendonae26,28 (FIG. 4).Cordea tendonea26,28 serve as “tension members” that prevent theleaflets22,24 ofmitral valve20 from moving past their closing point and prolapsing back into theleft atrium12. When leftventricle14 contracts during systole,cordae tendonae26,28 limit the upward motion (toward the left atrium) of the anterior andposterior leaflets22,24 past the point at which the anterior andposterior leaflets22,24 meet and seal to prevent backflow from theleft ventricle14 to the left atrium12 (“mitral regurgitation” or “mitral insufficiency”). Cordae tendonae26,28 arise from a columnae carnae or, more specifically, a musculi papillares (papillary muscles) of the columnae carnae. In various figures herein, some anatomical features have been deleted solely for clarity.
• Anterior leaflet22 andposterior leaflet24 of themitral valve20 are generally thin, flexible membranes. Whenmitral valve20 is closed,anterior leaflet22 andposterior leaflet24 are generally aligned and contact one another along a “line of coaptation” several millimeters back from their free edges, to create a seal that prevents mitral regurgitation. Alternatively, whenmitral valve20 is opened, blood flows downwardly through an opening created betweenanterior leaflet22 andposterior leaflet24 intoleft ventricle14.
• Many problems relating to the mitral valve may occur and may cause many types of ailments. Such problems include, but are not limited to, mitral regurgitation. Mitral regurgitation, or leakage, is the backflow of blood fromleft ventricle14 into theleft atrium12 due to an imperfect closure ofmitral valve20. That is, leakage often occurs when the anterior andposterior leaflets22,24 do not seal against each other, resulting in a gap betweenanterior leaflet22 andposterior leaflet24 when the leaflets are supposed to be fully coapted during systole.
• In general, a relatively significant systolic gap may exist betweenanterior leaflet22 andposterior leaflet24 for a variety of different reasons. For example, a gap may exist due to congenital malformations, because of ischemic disease, or because the heart10 has been damaged by a previous heart attack. Such a gap may also be created when congestive heart failure, e.g., cardiomyopathy, or some other type of distress which causes a heart10 to be enlarged. Enlargement of the heart10 can result in dilation (stretching) of the mitral annulus. This enlargement is usually limited to the posterior valve annulus and is associated with theposterior leaflet24, because the anterior annulus is a relatively rigid fibrous structure. When the posterior annulus enlarges, it causes theposterior leaflet24 to move away from theanterior leaflet22, causing a gap during systole because the two leaflets no longer form proper coaptation. This results in leakage of blood through thevalve20, or regurgitation.
• Blood leakage throughmitral valve20 generally causes a heart10 to operate less efficiently, as the heart10 pumps blood both out to the body via theaorta16, and also back (in the form of mitral regurgitation) into theleft atrium12. Leakage throughmitral valve20, or general mitral insufficiency, is thus often considered to be a precursor to congestive heart failure (CHF) or a cause of progressive worsening of heart failure. There are generally different levels of symptoms associated with heart failure. These levels are classified by the New York Heart Association (NYHA) functional classification system. The levels range from aClass 1 level which is associated with an asymptomatic patient who has substantially no physical limitations to a Class 4 level which is associated with a patient who is unable to carry out any physical activity without discomfort and has symptoms of cardiac insufficiency even at rest. In general, correcting or reducing the degree of mitral valve leakage may be successful in allowing the NYHA classification grade of a patient to be reduced. For instance, a patient with a Class 4 classification may have his classification reduced to Class 3 or Class 2 and, hence, be relatively comfortable at rest or even during mild physical exertion. By eliminating the flow of blood backwards into theleft atrium12, therapies that reduce mitral insufficiency reduce the workload of the heart10 and may prevent or slow the degradation of heart function and congestive heart failure symptoms that is common when a significant degree of mitral insufficiency remains uncorrected.
• Treatments used to correct for mitral valve leakage or, more generally, CHF, are typically highly invasive, open-heart surgical procedures. In extreme cases, this may include implantation of a ventricular assist device such as an artificial heart in a patient with a failing heart. The implantation of a ventricular assist device is often expensive, and a patient with a ventricular assist device must be placed on extended anti-coagulant therapy. Anti-coagulant therapy reduces the risk of blood clot formation for example, within the ventricular assist device. Reducing the risks of blood clots associated with the ventricular assist device is desirable, but anti-coagulant therapies may increase the risk of uncontrollable bleeding in a patient, e.g., as a result of a fall.
• Rather than implanting a ventricular assist device, bi-ventricular pacing devices similar to pacemakers may be implanted in some cases, e.g., cases in which a heart beats inefficiently in a particular asynchronous manner. While the implantation of a bi-ventricular pacing device may be effective, not all heart patients are suitable for receiving a bi-ventricular pacing device. Further, the implantation of a bi-ventricular pacing device is expensive, and is generally not effective in significantly reducing or eliminating the degree of mitral regurgitation.
• Open-heart surgical procedures that are intended to correct for mitral valve leakage, specifically, can involve the implantation of a replacement valve. Valves from animals, e.g., pigs, may be used to replace amitral valve20 in a human. While a pig valve may relatively successfully replace a mitral valve, such replacement valves generally wear out, thereby requiring additional open surgery at a later date. Mechanical valves, which are less likely to wear out, may also be used to replace a leaking mitral valve. However, when a mechanical valve is implanted, there is an increased risk of thromboembolism, and a patient is generally required to undergo extended anti-coagulant therapies.
• A less invasive surgical procedure involves heart bypass surgery associated with a port access procedure. For a port access procedure, the heart may be accessed by cutting between ribs or sometimes removing parts of one or more ribs, as opposed to dividing the sternum to open the entire chest of a patient.
• One open-heart surgical procedure that is particularly successful in correcting for mitral valve leakage and, in addition, mitral regurgitation, is an annuloplasty procedure. During an annuloplasty procedure, a medical device such as an annuloplasty ring may be implanted surgically on the left atrial side of mitral annulus (i.e., generally the attachment location of the base of the mitral valve to the heart). The device reduces a dilated mitral valve annulus to a relatively normal size and, specifically, moves the posterior leaflet closer to the anterior leaflet to aid anterior—posterior leaflet coaptation and thus improve the quality of mitral valve closure during systole. Annuloplasty rings are often shaped substantially like the letter “D” to correspond to the natural shape of the mitral annulus as viewed from above. Typically, the rings are formed from a rod or tube of biocompatible material, e.g., plastic, that has a DACRON mesh covering.
• In order for an annuloplasty ring to be implanted, a surgeon surgically attaches the annuloplasty ring to the mitral valve on the atrial side of the mitral valve. Conventional methods for installing a ring require open-heart surgery which involves opening a patient's sternum and placing the patient on a heart bypass machine. The annuloplasty ring is sewn on a top portion of the mitral valve. In sewing the annuloplasty ring onto the mitral valve, a surgeon generally sews the straight side of the “D” to the fibrous tissue located at the junction between the posterior wall of the aorta and the base of the anterior mitral valve leaflet. As the curved part of the ring is sewn to the posterior aspect of the annulus, the surgeon alternately acquires a relatively larger amount of tissue from the mitral annulus, e.g., a one-eighth inch bite of tissue, using a needle and thread, compared to a relatively smaller bite taken of the fabric covering of the annuloplasty ring. Once the thread has loosely coupled the annuloplasty ring to the mitral valve annulus tissue, the annuloplasty ring is slid into contact with the mitral annulus. The tissue of the posterior mitral annulus that was previously stretched out, e.g., due to an enlarged heart, is effectively reduced in circumference and pulled forwards towards the anterior mitral leaflet by the tension applied by annuloplasty ring with the suture or thread. As a result, a gap betweenanterior leaflet22 andposterior leaflet24 during ventricular contraction or systole may be reduced and even substantially closed off in many cases thereby significantly reducing or even eliminating mitral insufficiency. After themitral valve20 is shaped by the ring, the anterior andposterior leaflets22,24 will reform typically by pulling theposterior leaflet24 forward to properly meet theanterior leaflet22 and create a new contact line that will enablemitral valve20 to appear and to function properly.
• Although a patient that receives an annuloplasty ring may be subjected to anti-coagulant therapies, the therapies are not extensive, as a patient is only subjected to the therapies for a matter of weeks, e.g., until tissue grows over the annuloplasty ring.
• Another type of procedure that is generally effective in reducing mitral valve leakage associated with prolapse of the valve leaflets involves placing a single edge-to-edge suture in themitral valve20 that apposes the mid-portions of anterior andposterior leaflets22,24. For example, in an Alfieri stitch or a bow-tie repair procedure, an edge-to-edge stitch is made at approximately the center of the gap between ananterior leaflet22 and aposterior leaflet24 of amitral valve20. Once the stitch is in place between the anterior andposterior leaflets22,24, it is pulled in to form a suture which holdsanterior leaflet22 againstposterior leaflet24.
• Another surgical procedure that reduces mitral valve leakage involves placing sutures along a mitral valve annulus around theposterior leaflet24. These sutures may be formed as a double track, e.g., in two “rows” from a single strand of suture material. The sutures are tied off at approximately a central point (P2) ofposterior leaflet24. Pledgets are often positioned under selected sutures to prevent the sutures from tearing throughannulus40. When the sutures are tightened and tied off, the circumference of theannulus40 may effectively be reduced to a desired size such that the size of a systolic gap betweenposterior leaflet24 and ananterior leaflet22 may be reduced.
• While invasive surgical procedures have proven to be effective in the treatment of mitral valve leakage, invasive surgical procedures often have significant drawbacks. Any time a patient undergoes open-heart surgery, there is a risk of infection. Opening the sternum and using a cardiopulmonary bypass machine has also been shown to result in a significant incidence of both short and long term neurological deficits. Further, given the complexity of open-heart surgery, and the significant associated recovery time, people that are not greatly inconvenienced by CHF symptoms, e.g., people at aClass 1 classification, may choose not to have corrective surgery. In addition, people that need open heart surgery the most, e.g., people at a Class 4 classification, may either be too frail or too weak to undergo the surgery. Hence, many people that may benefit from a surgically repaired mitral valve may not undergo surgery.
• In another method, a cinching device is placed within the coronary sinus (CS) using a catheter system, with distal, mid, and proximal anchors within the lumen of the CS to allow plication of theannulus40 via the CS. In practice, these anchors are cinched together and the distance between them is shortened by pulling a flexible tensile member such as a cable or suture with the intent being to shorten thevalve annulus40 and pull theposterior leaflet24 closer to theanterior leaflet22 in a manner similar to an annuloplasty procedure. Unfortunately, since the tissue that forms the CS is relatively delicate, the anchors are prone to tear the tissue during the cinching procedure. In addition, the effect on the mitral annulus may be reduced when the CS of a particular patient is not directly aligned with the mitral annulus. Other minimally invasive techniques have been proposed but have various drawbacks related to such factors as effectiveness and/or accuracy of catheter-based implementation.
SUMMARY
• In one embodiment, a system is provided for accurately introducing an element into tissue proximate (i.e., either at or close to) the mitral valve annulus of the heart of a patient. The element may be any desired structure suitable for the intended purpose. In one more specific embodiment, for example, the element may advantageously comprise a guide wire. The system includes a first catheter device having a first distal end portion capable of being introduced through the vascular system of the patient and into the coronary sinus proximate the mitral valve annulus. The first catheter device includes first, second and third spaced apart radiopaque markers at the first distal end portion. The system further includes a second catheter device having a second distal end portion capable of being introduced through the vascular system of the patient and into the left ventricle of the heart proximate the mitral valve annulus. The second catheter device includes a fourth radiopaque marker at the second distal end portion and a lumen for delivering an element from the second distal end portion. The fourth radiopaque marker may be aligned with reference to at least one of the first, second or third radiopaque markers to deliver the element into the mitral valve tissue. In one exemplary embodiment, for example, the fourth radiopaque marker is aligned with the first radiopaque marker of the first catheter device generally at location P2 of the posterior mitral annulus. The first, second and third radiopaque markers may be spaced apart to correspond to locations P1, P2 and P3 of the posterior mitral valve annulus.
• A method is also provided for accurately introducing an element into tissue proximate the mitral valve annulus using a first catheter device having a first distal end portion with a first radiopaque marker and a second catheter device having a second distal end portion with a lumen. The method comprises introducing the first distal end portion of the first catheter device through the vascular system of the patient and into the coronary sinus proximate the mitral valve annulus. The first radiopaque marker is positioned at a desired location in the coronary sinus proximate the mitral valve annulus. The second distal end portion of the second catheter device is introduced through the vascular system of the patient and into the heart proximate the mitral valve annulus. The second distal end portion is positioned in a desired orientation relative to the first radiopaque marker. The element is then delivered through the lumen into tissue proximate the mitral valve annulus with the second distal end portion in the desired orientation.
• The method of accurately introducing the element into tissue proximate the mitral valve annulus may further comprise delivering a first guide wire through the mitral valve annulus and into the left atrium of the heart from the left ventricle of the heart. The method may further comprise guiding a second element over the first guide wire to a position proximate the mitral valve annulus and the second element may further comprise a third catheter device. A second guide wire may be delivered from the third catheter device through the mitral valve annulus and into the left atrium of the heart from the left ventricle of the heart. The method may further comprise using the first and second guide wires to deliver first and second anchors, respectively, into the mitral valve annulus, shortening the distance between the first and second anchors, and locking the first and second anchors with respect to each other. This may, for example, form plicated annulus tissue helpful for reducing regurgitation through the mitral valve. A third guide wire may be delivered from the third catheter device through the mitral valve annulus and into the left atrium of the heart from the left ventricle of the heart. This third guide wire may be used to deliver a third anchor into the mitral valve annulus and the distance between at least two of the first, second or third anchors may be shortened and then at least these two anchors may be locked with respect to each other. In an illustrative embodiment, all three anchors are locked with respect to each other with the tissue plicated between each of the adjacent anchors. The first distal end portion may further comprise two additional radiopaque markers spaced apart on opposite sides of the first radiopaque marker. In this case, the method may further comprise positioning the first radiopaque marker at a location in the coronary sinus proximate location P2 of the mitral valve annulus, and positioning the two additional radiopaque markers in the coronary sinus respectively more proximate to locations P1 and P3 of the mitral valve annulus. As further options, the second distal end portion may further include a second radiopaque marker and positioning the second distal end may further comprise positioning the second radiopaque marker in a desired orientation relative to the first radiopaque marker. The first radiopaque marker may have a predetermined cross sectional shape (e.g., circular) when viewed directly along the longitudinal axis of the first catheter device. In association with this feature, the method may further comprise viewing the first radiopaque marker directly along the longitudinal axis of the first catheter device while positioning the second distal end portion in the desired orientation.
• In another illustrative embodiment, a catheter device is provided and capable of being directed through the vascular system of a patient and delivering first and second elements into tissue. Again, these elements may be any structure suited for the intended purpose. The catheter device comprises first, second and third catheter members respectively including first, second and third lumens. A first connecting member is coupled between the first and second catheter members and a second connecting member coupled between the first and third catheter members. The second and third catheter members are laterally movable in generally opposite directions relative to the first catheter member between collapsed positions suitable for delivery of the first, second and third catheter members through the vascular system and expanded positions in which the second and third catheter members are at laterally spaced apart positions relative to the first catheter member for delivering the first and second elements into the tissue through the second and third lumens.
• The catheter device may further comprise a third connecting member coupled between the first and second catheter members and a fourth connecting member coupled between the first and third catheter members. The first, second, third and fourth connecting members may further comprise bars pivotally coupled between the first, second and third catheter members. The device may further comprise an outer catheter member or sheath having a fourth lumen with the fourth lumen receiving the first, second and third catheter members. In this embodiment, the first, second and third catheter members may therefore be a triple lumen catheter received within and extendable from the distal end of an outer sheath. The second and third catheter members may be movable in a lengthwise direction relative to the first catheter member as the second and third catheter members move laterally to the expanded positions.
• The catheter device including the triple lumen catheter, or first, second and third catheter members, may further comprise first, second and third guide wires respectively received in the first, second and third lumens. For example, the first guide wire may be used as an initial guide for delivery of the catheter device to a surgical site, such as within the left ventricle of the heart, and the second and third guide wires may be extendable from the device into tissue, such as mitral valve annulus tissue. The first, second and third guide wires may further comprise radiofrequency (RF) energy delivery wires capable of applying radiofrequency energy to assist with penetrating the tissue.
• In another embodiment, a method is provided for delivering respective elements into spaced apart locations along an annulus of a mitral valve using a catheter device including first, second and third catheter members that respectively include first, second and third lumens. The method comprises directing a first guide wire through the vascular system and into the heart of a patient. The first, second and third catheter members are introduced through the vascular system and into the heart of the patient with the first guide wire received in the first lumen and with the first, second and third catheter members are in a collapsed state relative to one another. Distal end portions of the first, second and third catheter members are positioned proximate the annulus. The distal end portions of the second and third catheter members are expanded laterally away from the first catheter member. The respective elements are then delivered respectively into tissue proximate the annulus through the second and third lumens.
• The method of delivering respective elements into spaced apart locations along the annulus may further comprise delivering second and third guide wires respectively through the second and third lumens. The method may further comprise applying radiofrequency energy with distal tip portions of the second and third guide wires to assist with penetrating through the tissue. The distal end portions of the first, second and third guide wires may be extended into the left atrium of the heart. The method may then further comprise delivering first, second and third anchors into the tissue using the first, second and third guide wires as guides to the spaced apart locations. The first, second and third anchors may be connected to the tissue. Distances between two or more of the anchors may be shortened and locked in position as generally described above. Respective first, second and third flexible tensile member portions may be coupled to the first, second and third anchors and locking the first, second and third anchors may further comprise locking at least two of the first, second or third flexible tensile member portions together. The flexible tensile member portions may be comprised of any suitable material having requisite strength, flexibility and biocompatibility. For this purpose, for example, any suitable suture material, which may be portions of the same suture material, or discrete and separate suture threads having respective free ends, may be used. The first, second and third anchors may be respectively secured to the first, second and third flexible tensile members to form first, second and third anchor assemblies. These anchor assemblies may be delivered to the spaced apart locations via at least one anchor delivery catheter. In an illustrative embodiment, these anchor assemblies are individually delivered to the left ventricle via individual, separate anchor delivery catheters.
• In another embodiment, a tissue anchor is provided generally comprising a flexible tensile member and a plurality of discrete, flat flexible anchor elements coupled for movement along the flexible tensile member to form one illustrative embodiment of an anchor assembly. The flexible tensile member and at least one of the plurality of discrete, flat flexible anchor elements are capable of being inserted through tissue and of moving between an elongate configuration and a shortened configuration suitable for anchoring the assembly against at least one side of the tissue. This anchor assembly includes a proximal end portion, a distal end portion, and a compressible intermediate portion between the proximal and distal end portions. The compressible intermediate portion is compressible in that it may be shortened during an anchoring process. For example, it may comprise multiple anchor elements itself, or more simply a space between proximal and distal anchor elements connected by the flexible tensile member. The anchor elements can slide relative to the flexible tensile member and the flexible tensile member is capable of being pulled to cause the anchor elements to move relative to the flexible tensile member from the elongate configuration to the shortened configuration.
• In this anchor assembly embodiment, the anchor elements may be formed from any suitable biocompatible material. For example, the material may be selected from at least one of natural fibers, synthetic fibers, polymers, metals or any combinations thereof (i.e., combinations with one another and/or with other materials). In one embodiment, the anchor elements are formed of material that promotes tissue ingrowth such that after implantation, the anchor assembly will be essentially covered by natural tissue of the patient. The flexible tensile member may comprise a suture having a suitable lock member, such as a simple slip knot for allowing the proximal end of the flexible tensile member to be pulled causing movement of the slip knot distally and resulting in compression or relative movement of two or more anchor elements toward each other. The flexible tensile member may extend through each of the anchor elements at multiple locations and one or more of the anchor elements and/or the flexible tensile member, or both, may have at least one radiopaque marker to allow visualization under a suitable viewing device such as a fluoroscope during and/or after the anchor installation procedure. In this embodiment the plurality of discrete, flat flexible anchor elements may have any suitable shape. The anchor elements are sufficiently flexible to allow contraction or folding into an anchor delivery catheter and subsequent expansion or unfolding after deployment from the anchor delivery catheter to provide a wider retaining surface against the tissue. A deploying device may be operatively associated with the anchor delivery catheter and operable to extend or deploy the anchor assembly from the anchor delivery catheter. For example, this deploying device may further comprise a deploying member, such as a flexible rod or inner deployment catheter, capable of pushing the anchor assembly at least partially out of the lumen of the anchor delivery catheter.
• In another embodiment, a method is provided for anchoring tissue with a first anchor assembly comprised of a first plurality of discrete, flat flexible anchor elements. The first anchor assembly includes a proximal end portion, a distal end portion and a compressible intermediate portion located between the proximal and distal end portions and movable between an elongated configuration and a shortened configuration. The method comprises inserting at least one of the anchor elements through the tissue and pulling a first flexible tensile member coupled for sliding movement relative to the first plurality of discrete, flat flexible anchor elements. This draws the proximal and distal end portions of the first anchor assembly toward each other and compresses the intermediate portion into the shortened configuration with the assembly engaged against the tissue. The tissue may comprise the mitral valve annulus and the first anchor assembly may be engaged on opposite sides of the tissue, such as on opposite sides of the mitral valve annulus. The method may further comprise inserting second and even third anchor assemblies through the tissue at spaced apart locations from the first anchor assembly and drawing the two or three anchor assemblies toward each other to plicate the tissue whereupon the anchor assemblies are locked relative to each other to lock the plicated condition of the tissue. This procedure may, for example, be repeated any number of times to plicate the posterior portion of the mitral valve annulus for purposes of achieving annuloplasty.
• In another embodiment, a suture cutter is provided for percutaneously cutting a suture located within a patient. The suture cutter may comprise an actuator for manipulation by a medical professional and an intermediate catheter portion operatively coupled to the actuator for insertion into the vascular system of the patient. A cutting assembly is operatively coupled to the intermediate catheter portion and the actuator. The cutting assembly includes a blade housing and a blade with a cutting edge mounted for movement in the blade housing. An adjustably sized cutting window is defined between the cutting edge and the blade housing and the cutting edge cuts a suture received inside of the cutting window as the cutting edge moves in the blade housing to reduce the size of the cutting window. In one embodiment, an anvil may be positioned on an opposite side of the cutting window from the cutting edge and the suture may be cut against the anvil. In another embodiment, a blade receiving slot may be located on an opposite side of the cutting window from the cutting edge and the suture may be cut as the blade moves into the blade receiving slot. The blade housing may further comprise a first aperture on one side of the blade and a second aperture on an opposite side of the blade such that the suture is adapted to pass from the first aperture to the second aperture through the cutting window.
• In another embodiment, a method of cutting a suture located within a patient is provided and involves positioning a suture cutter within the patient, with the suture cutter including a blade movable through an adjustably sized cutting window. A suture is directed through the cutting window, such as at a time before the suture cutter is directed into the patient through the vascular system. The size of the cutting window is reduced by moving the blade towards the suture and the suture is then cut with the blade, either against an anvil or by directing the blade into a blade receiving space past the suture (e.g., into a slot). The suture cutter may be directed through a catheter leading into the vascular system of the patient. The suture cutter may be used, for example, to cut the tails from the sutures used during one or more of the annuloplasty procedures described herein.
• In another embodiment, a plication assistance device is provided and may be used, for example, to tension and lock the flexible tensile members described herein. The device comprises a support structure and a first carriage fixed to the support structure and configured to hold an outer plication catheter. A second carriage is fixed to the support structure at a location proximal to the first carriage. At least one of the first or second carriages is slidable along the support structure and capable of being locked in position relative to the support structure. The second or proximal carriage is configured to hold an inner plication catheter. A first suture tensioning mechanism is mounted to the support structure at a location proximal to the second carriage and a second suture tensioning mechanism is mounted to the support structure also at a location proximal to the second carriage. The plication assistance device may further comprise a third suture tensioning mechanism mounted to the support structure at a location proximal to the second carriage. The first and second suture tensioning mechanisms may further comprise first and second rotatable spools. The first and second carriages may respectively include first and second locking devices for securing the outer plication catheter and inner plication catheter thereto. The plication assistance device may include a suture tension gauge operatively connected with the support structure and configured to measure tension of a suture being tensioned by at least one of the first or second suture tensioning mechanisms.
• Various additional features, advantages, and aspects of the invention will become more readily apparent to those of ordinary skill in the art upon review of the following detailed description of the illustrative embodiments taken in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
• FIG. 1 is a schematic illustration of a patient with the anatomy of the heart in cross section and a guide catheter introduced through the vascular system into the aorta and heart of the patient.
• FIG. 2 is a cross sectional view of the heart from above showing the introduction of various catheters.
• FIG. 3 is a cross sectional view of the heart similar toFIG. 2 and illustrating the further introduction of a guide wire.
• FIG. 4 is a partial longitudinal cross sectional view of the heart showing the positioning of the catheters in the left ventricle and coronary sinus.
• FIG. 5 is a cross sectional view of the heart similar toFIG. 4, but illustrating the further introduction of a guide wire through the mitral valve annulus.
• FIG. 6 is an enlarged view of the mitral valve in cross section and showing the introduction of an expandable triple lumen catheter into the left ventricle.
• FIG. 7 is a cross sectional view of the mitral valve similar toFIG. 6 and showing the further introduction of the expandable triple lumen catheter.
• FIG. 8 is a cross sectional view of the heart similar toFIG. 7, but illustrating the initial expansion of the triple lumen catheter.
• FIG. 9 is an elevational view of the expanding triple lumen catheter relative to the mitral valve annulus.
• FIG. 10 is a view similar toFIG. 9, but showing the full expansion of the triple lumen catheter.
• FIG. 11 is an elevational view showing the introduction of an anchor delivery catheter over one of the guide wires.
• FIG. 12 is a view similar toFIG. 11, but showing the initial deployment of the anchor from the anchor delivery catheter.
• FIG. 12A is a view similar toFIG. 12, but showing a portion of the anchor compressed or shortened on a distal side of the tissue.
• FIG. 13 is a view similar toFIG. 12, but illustrating the full deployment of the anchor from the anchor delivery catheter and the anchor delivery catheter being retracted.
• FIG. 14 is a view similar toFIG. 13, but illustrating deployment of a second anchor from an anchor delivery catheter.
• FIG. 15 is a view similar toFIG. 14, but showing the deployment of a third anchor from an anchor delivery catheter and retraction of the anchor delivery catheter.
• FIG. 16 is an elevational view showing the deployment of a suture locker over the three sutures associated with the respective anchors.
• FIGS. 16A,16B and16C are enlarged views showing the progressive deployment and locking of the suture locker onto the three sutures.
• FIG. 16D is a longitudinal cross sectional view of the suture locker showing the locked condition.
• FIG. 17 is an elevational view showing retraction of the plication catheter and the mitral valve annulus in a plicated condition.
• FIG. 18 is a perspective view of a plication assistance device useful for tensioning the sutures and deploying the suture locker.
• FIGS. 18A and 18B are respective partially cross sectioned views of a tension gauge associated with the plication assistance device ofFIG. 18 with the sections taken lengthwise along the gauge.
• FIG. 19 is an elevational view showing the introduction of a suture cutter catheter for cutting the suture material extending from the suture locker.
• FIGS. 20A,20B and20C are cross sectional views of the distal end portion of the suture cutter showing the suture cutting operation.
• FIG. 21 is a cross sectional view of the locked anchor assembly on the plicated annulus.
• FIG. 22 is a cross sectioned view of the mitral valve showing the locked anchor assembly.
• FIG. 23 is a perspective view of a first alternative anchor.
• FIG. 24 is a perspective view of a second alternative anchor.
• FIG. 25 is an elevational view of a third alternative anchor.
DETAILED DESCRIPTION OF THE ILLUSTRATIVE EMBODIMENTS
• Reference will be made to the various figures in describing the methods, devices and systems in various forms useful to the purpose of plicating tissue, for example, and particularly useful for plicating annulus tissue associated with the mitral valve of a patient. It will be appreciated that although specific details of the methods, devices and systems will be given herein, many different changes, substitutions and additions may be made to such details by those of ordinary skill while still falling within the inventive aspects more generally set forth herein and understood by those of ordinary skill upon review of the present disclosure in its entirety. It should be noted that the terms “proximal” and “distal” are used, as conventional in the art, to denote spatial relationship relative to the person using the particular device or component. That is, “proximal” refers to a position closer to the user and “distal” refers to a position farther from the user.
• Referring first toFIGS. 1-4, aguide catheter50 is illustrated as being directed into the vascular system of a patient, such as through an artery in the groin region of the patient, as shown inFIG. 1. Theguide catheter50 may be a 12 mm catheter directed through the vascular system in any suitable manner. As shown, guidecatheter50 is directed into theaorta16, through theaortic valve18 and into theleft ventricle14 between the pair ofcordae tendonae26,28 as best shown inFIG. 4. Thisguide catheter50 is then used as a guide sheath or tube for guiding all of the subsequent catheter devices into theleft ventricle14 for use in a method of plicating theannulus40 of themitral valve20. It will be appreciated that other methods of guidance may be used as alternatives or in a supplemental fashion to the various methods disclosed herein. After initial insertion of theguide catheter50, aP2 catheter52 is inserted to theguide catheter50. As known in the art, “P2” refers to the central location of the base of theposterior leaflet24 along theannulus40. TheP2 catheter52 may have a deflectable tip to allow more accurate and easier manipulation and location of the catheter tip relative to theannulus40. The catheter tip can include aradiopaque marker52avisible under a fluoroscope. A coronary sinus orCS catheter56 is directed into thecoronary sinus36 via the vascular system of the patient, such as through an entry point in the jugular vein of the patient and subsequently through theright atrium38 as shown best inFIGS. 2 and 3. TheCS catheter56 is directed into thecoronary sinus36 as shown inFIG. 3 such that threeradiopaque markers56a,56b,56con or in thecatheter56 are located generally at positions approximating P1, P2 and P3 along themitral valve annulus40. In this regard, thecoronary sinus36 runs generally along themitral valve annulus40 in most patients and therefore provides a good location for placement ofmarkers56a,56b,56c. Thedistal tip52aof theP2 catheter52 is aligned at theannulus40 as shown inFIG. 4 such that it is directed upward at the interior of theleft atrium12.Radiopaque marker56bin thecoronary sinus36 is used to determine and ensure proper placement of thedistal tip52aat the P2 location along theannulus40. Contrast media injections into the LV and/or LA may also be made to confirm positioning under a fluoroscope, for example.
• Referring toFIG. 5, when accurate positioning of theP2 catheter52 has been confirmed using a fluoroscope, for example, a first RF guide wire may be introduced through the P2 catheter. The P2 guide wire may have a radio frequency (RF)energy delivery tip60afor assisting with penetration through mitral tissue generally at theannulus40. For this purpose, a suitable RF energy device (not shown) may be coupled to guidewire60, as well as the other RF guide wires disclosed hereinbelow. The distal portion of theP2 guide wire60 then extends into the left atrium and curls back on itself to help prevent tissue damage within theleft atrium12 as shown best inFIG. 6.
• The method then involves the further introduction of respective P1 andP3 guide wires62,64 through the use of atriple lumen catheter70 contained within asheath72.Triple lumen catheter70 andsheath72 are introduced into theguide catheter50 after withdrawal of theP2 catheter52 therefrom.Triple lumen catheter70 more specifically comprises a central orfirst catheter member74 having alumen74athreaded over theP2 guide wire60. In addition to this first orP2 catheter member74,triple lumen catheter70 further comprises second andthird catheter members76,78 respectively corresponding generally to the P1 and P3 locations generally along the posteriormitral annulus40. The second andthird catheter members76,78 also includerespective lumens76a,78acontainingrespective guide wires62 and64. It will be appreciated that other locations along theannulus40 may be chosen in addition to or instead of those discussed illustratively herein.
• As further shown inFIG. 7, the combinedtriple lumen catheter70 andsheath72 are pushed through theguide catheter50 and an expandable distal portion comprised ofcatheter members74,76,78 is then extended from thesheath72 in theleft ventricle14 of the patient. The initial positioning of theP2 guide wire60 ensures that the middle orP2 catheter member74 will be an accurate reference point at P2. When thesheath72 reaches the distal location shown inFIGS. 7-9, thetriple lumen catheter70 is pushed outward from the distal end of thesheath72 and expansion takes place as shown inFIGS. 8 and 9. As best shown inFIG. 9, the twoouter catheter members76,78 (that is, the P1 and P3 catheter members) automatically expand outward due to their coupling with the central orP2 catheter member74 by way of connectingbars80,82,84,86. These connecting bars may, for example, be formed from thin metallic plate material such as superelastic material, stainless steel, other metals or combinations of materials. It has been found that a thin plate of Nitinol™ (nickel-titanium) stacked adjacent to a thin plate of stainless steel works well for each connectingbar80,82,84,86. The Nitinol exhibits spring characteristics effective for the expansion of the twoouter catheter members76,78 away from the inner orcentral catheter member74, while the stainless steel plate of each connecting bar provides additional stiffness for support purposes.
• Respective connectors88,90,92,94,96,98 couple each connectingbar80,82,84,86 to therespective catheter members76,74,78 as shown inFIG. 9 with a living hinge adjacent eachconnector88,90,92,94,96,98. This illustrative structure therefore essentially forms two four-bar type linkage structures with one being formed bycatheter members74,76 and bars80,84 and the other being formed bycatheter members74,78 and bars82,86. This expandable structure therefore causes the twoouter catheter members76,78 to translate distally and also expand laterally outward to known positions dictated by the respective lengths of thebars80,82,84,86. In this example, the distal end ofcatheter76 is ultimately positioned approximately at position P1 along themitral annulus40, while the distal end ofcatheter member78 is positioned approximately at position P3 along themitral annulus40. It will be appreciated that these positions are representative and illustrative only and that the method may be performed at any other positions along themitral annulus40 depending on the desires of the surgeon and needs of the patient, for example.
• Catheter members76,78 includelumens76a,78afrom which the respective P1 andP3 guide wires62,64 may be directed as shown inFIG. 10. Like theP2 guide wire60, the P1 andP3 guide wires62,64 may include RF or radiofrequencyenergy delivery tips62a,64afor assisting with penetration through theannulus tissue40. It will be appreciated that when the “annulus tissue” is referred to herein, this refers to tissue generally along theannulus40 and may, in fact, be tissue on the base of theposterior leaflet24 itself. As shown inFIG. 10, theseguide wires62a,64amay generally align with theradiopaque markers56a,56cof theCS catheter56 located in the coronary sinus36 (FIG. 3). TheRF guide wires62,64 are inserted through theannulus tissue40 such that distal portions thereof extend into theleft atrium12 in manners similar toRF guide wire60 as generally shown inFIG. 6. Thetriple lumen catheter70, including thesheath72, is then removed from theguide catheter50.
• FIGS. 11-15 illustrate the procedure for attaching anchors to theannulus tissue40. In particular,FIG. 11 shows the initial introduction of a P2anchor delivery catheter100 over P2guide wire60. As further shown inFIG. 12, thedistal end100aof P2anchor delivery catheter100 is pushed alongRF guide wire60 until it penetrates through theannulus tissue40. As further shown inFIG. 12, after thedistal end100ais penetrated through the annulus tissue and into theleft atrium12, ananchor assembly102 is partially deployed as shown. In this embodiment, theanchor assembly102 comprises a plurality of discrete, flatflexible anchor elements104 coupled to a flexible tensile member, for example, in the form of asuture106. It will be appreciated that in other forms or embodiments of the invention, other anchors (sometimes referred to as fasteners, plicating elements, etc.) may be used instead. As needed, theguide wire60 may be removed before or after the anchor deployment process. As further shown inFIGS. 12A and 13, the P2anchor delivery catheter100 is pulled back into theleft ventricle14 and the remaining proximal portion of theanchor assembly102 is then deployed from thedistal end100asuch that a portion of theanchor elements104 are located in the left atrium and another portion of the anchor elements are located in the left ventricle. Theanchor elements104 are coupled to thesuture106, in this example, by threading thesuture106 upwardly through theelements104 and then back downwardly through theanchor elements104 as shown. Aslip knot108 is then formed, or another type of lock member is used, so that when a proximal end portion of thesuture106 is pulled, all of theanchor elements104 will be drawn together against opposite sides of theannulus tissue40 as shown inFIG. 14. This leaves a long “tail” of thesuture106 outside the patient's body for subsequent tensioning and plication as will be described below. One or more of theanchor elements104 may have a radiopaque marker104afor better visualization under a suitable viewing device during the procedure. For example, one such marker may be located on a proximal portion of theanchor102 and one may be located on a distal portion of theanchor102. Alternatively or in addition, the suture material or other flexible tension members discussed herein may have one or more radiopaque areas for better visualization.
• As shown inFIG. 14, a P1anchor delivery catheter110 is threaded over theP1 guide wire62 throughguide catheter50 after the P2anchor delivery catheter100 has been removed. Ananchor assembly112 again comprised of discrete, flatflexible anchor elements114 is deployed through adistal end110aof the P1anchor delivery catheter110 in the same manner as described above with respect toanchor assembly102. Likeanchor assembly102,anchor assembly112 includes a flexible tensile member, such as asuture116, having a slip knot or other lock member for drawing theanchor elements114 together against opposite sides of theannulus tissue40.
• Likewise,FIG. 15 illustrates a third or P3anchor delivery catheter120 used in the same manner asanchor delivery catheters100,110 for deploying a third orP3 anchor assembly122 comprised of discrete, flatflexible anchor elements124 coupled by a flexible tensile member, such as asuture126, and capable of being drawn together against opposite sides ofannulus tissue40 through the use of a slip knot orother lock member128.Anchor delivery catheters100,110,120 may be separate catheters or may be the same catheter used to separately deliver the anchors or other fasteners or plicating elements. For ease of use, however, separate catheters that have been preloaded with separate anchors may be easiest to use in practice. Suitable pusher rods or elements125 (FIG. 12) may be used to push theanchor assemblies102,112,122 from theirrespective catheters100,110,120. Other deployment methods may be used instead.Anchor elements104,114,124 may be formed from a material such as a surgical grade fabric material (e.g., a polyester material such as Dacron™) designed to promote tissue ingrowth so that theanchors102,112,122 become essentially encased in tissue over time. As mentioned herein, in various aspects of implementing systems and methods herein, any suitable anchor may be used. For example, other suitable anchors are disclosed in U.S. patent application Ser. No. 11/174,951, filed Jul. 5, 2005, assigned to the assignee of the present invention and the disclosure of which is hereby incorporated by reference herein.
• FIGS.16 and16A-D generally illustrate a cinching and locking procedure for plicating themitral annulus tissue40. Specifically, this can involve the use of anouter plication catheter130 carrying asuture locker132 at its distal end. Aninner plication catheter134 is received for sliding movement within the lumen of theouter plication catheter130. Thedistal end134aof theinner plication catheter134 abuts a proximal portion of thesuture locker132. Thesuture locker132 includes aslidable pin136 having ends that are received inrespective slot portions130a,130bofouter plication catheter130 at its distal end. More specifically, thepin136 is initially retained in anangled slot130b, and in an identical slot (not shown) on the diametrically opposite side of theouter plication catheter134, while thecatheter assembly130,134 is directed through theguide catheter50 into theleft ventricle14 as shown inFIG. 16. Thus, theinner catheter134 provides an upward force against thesuture locker132 to bias the pin upwardly to the end of theangled slot130bas shown inFIG. 16A.
• After therespective sutures106,116,126 have been tensioned, the cinching or plicating process and locking process may begin. In this regard, and as shown inFIG. 16B, theouter plication catheter130 is initially moved in a distal direction as shown by the arrow inFIG. 16B, relative to theinner plication catheter134, to force thepin136 to ride downward in theangled slot130bsuch that it is aligned with thevertical slot130aand is pushed upwardly in theslots138,140 (FIG. 16D). This tightens the pin against therespective sutures106,116,126 as the suture locker travels toward theannulus tissue40. Once the desired amount of plicated tissue or folds144 have been formed, theplication catheters130,134 may be withdrawn proximally through theguide catheter50. As shown inFIG. 16D, thesuture locker132 may include a spring-like member142 for preventing proximal movement of thepin136 after the desired amount of plication or tightening has been achieved. For further detail on the suture locker, as well as other illustrative forms of useful suture lockers, reference is made to U.S. Patent Application Ser. No. 60/803,183, filed on May 25, 2006 and assigned to the assignee of the present invention, and the disclosure of which is hereby fully incorporated by reference herein. It will be understood that many types of lockers may be used for locking theanchor assemblies102,112,122, or other fasteners or plicating elements in position after the desired amount of plication has been achieved. As shown,anchor elements114,124 may also have one or more radiopaque markers114a,124aas discussed above relative to anchorelements104. Furthermore, theslip knot108 or other lock member and/or other portions of the suture material described herein may have one or more radiopaque markers.
• As shown inFIG. 18, theouter plication catheter130 includes a proximal hub146 and theinner plication catheter134 includes ahub148. FIG.18 illustrates aplication assistance device150 that may be used for tensioning therespective sutures106,116,126 and moving thesuture locker132 as previously described in connection withFIGS. 16,16A-D, and17. Theplication assistance device150 includes asupport structure152 which may take the form of abase plate152.Base plate152 includes a longitudinally extending slot152a. A fixedcarriage154 is rigidly affixed to a distal end of thebase plate152 and a slidingcarriage156 is secured to a more proximal location ofbase plate152. More specifically, slidingcarriage156 is affixed by a pin or other structure (not shown) so that it may slide along slot152a. For this purpose as well, slidingcarriage156 includes alongitudinally extending slot156athat is parallel to slot152a. Slot156areceives a slide lock158 that may be rotated to respectively lock and unlock the slidingcarriage156 relative to thebase plate152. For this purpose, for example, the slide lock158 may have a threaded member (not shown) that engagesbase plate152. When the slide lock158 is loosened, the slidingcarriage156 may slide along slot152aas the slide lock158 slides alongslot156a. The slide lock158 may then be tightened at the desired position to fix the slidingcarriage156 at a desired location along thebase plate152.
• Thecarriages154,156 also includerespective catheter locks160,162 that may be rotated to tighten and loosen the connections betweenrespective catheter hubs146,148 andcarriages154,156. A proximal end portion of thebase plate152 includessuture tensioning mechanisms164,166,168 for therespective sutures106,116,126. More specifically, these mechanisms includespools170,172,174 for receiving proximal end portions of therespective sutures106,116,126 which may be wrapped and firmly engaged with thespools170,172,174. Thesuture tensioning mechanisms164,166,168 further compriserotatable knobs176,178,180 connected with respective rightangle gear boxes182,184,186 for converting rotation of theknobs176,178,180 to rotation of thespools170,172,174. That is, an output of eachgear box182,184,186 is coupled to a respective one of thespools170,172,174. In this manner, eachsuture106,116,126 may be separately pulled or tensioned by rotating thecorresponding knob176,178,180.
• In use, the inner andouter plication catheters130 and134 are respectively secured and locked into thecarriages154 and156, as shown inFIG. 18, after thesuture locker132 has been moved approximately to the position as shown inFIG. 16. In this position, thesuture locker132 is firmly held by the twocatheters130,134 as previously described and after the slidingcarriage156 is locked down onto thebase plate152 by tightening slide lock158. At this point, thesutures106,116,126 are wrapped around their correspondingspools170,172,174 and tensioned at a suitable minimum force. In the illustrative method, the tension at P1 and P3 (i.e., sutures116 and126) may be in the range of 2-4 lbs, while the tension at P2 (i.e., suture106) may be in the range of 4-6 lbs. The tension at P1 and P3 is maintained high enough to sustain tissue plication, while the tension of P2 is slightly higher so as to lock or activate thelocker132 after plication occurs. More specifically, the higher tension onP2 suture106 drives thepin136 in the locker distally in theslot138 relative to the body of thelocker132. Stated another way, the body of thelocker132 moves slightly proximally as thepin136 remains stationary and grips thesutures106,116,126.
• As best shown inFIGS. 18A and 18B, theplication assistance device150 includes a tension gauge mechanism188 for allowing the user to measure the tension of at least one of thesutures106,116,126. As illustrated, the tension gauge mechanism188 is being used to measure the tension ofP2 suture106. More specifically, this illustrative tension gauge mechanism188 comprises a housing or other support190 having a lever arm192 pivotally mounted therein by way of a pivot194. One end of the lever arm192 includes an element such as a roller196 for engaging thesuture106, while the opposite end includes a pin or other indicator198 for indicating the level of tension being applied to thesuture106. A graduatedscale200 is provided in connection with the indicator198 to indicate the tension being applied to thesuture106. Alternatively, for example, an electronic indicator and digital readout may be used. The indicator or pin198 moves within a slot202 in the housing190 to allow it to be observed by the user. A spring support member203 is also secured rigidly to the housing190, for example, by a pin or fastener204, or is simply a part of the housing or support190, and does not allow pivotal movement of the spring support member203. An opposite end of the spring support member203 includes a connection point, which may be a hole205, while an intermediate location on the lever arm192 likewise includes a connection point, which may also be a hole206. A coil spring207 is connected between these two connection points205,206 and applies a force resistive to rotation of the lever arm192 and upward movement of the indicator198. Thus, this system, including the spring207, is designed such that an applied tension in the direction of the arrow208 will force the lever arm192 to rotate clockwise around the pivot194 (arrow209) against the force of the spring207 thereby indicating a measured amount of tension through upward movement of the indicator or pin198 along the graduatedscale200. Thescale200, for example, may be graduated in any suitable manner depending on the needs of the procedure. In the present case, for purposes of measuring the tension onP2 suture106, thescale200 may be graduated to indicate forces between about 4 lbs and about 6 lbs with the middle of the range being suitable for tensioning theP2 suture106.
• This suture tension provides potential energy that moves thecatheters130,134 relative to each other and locks thesuture locker132 as previously described, after the slidingcarriage156 is unlocked by loosening slide lock158. Theplication catheters130,132 are then removed from theguide catheter50 leaving the long proximal tails of thesuture106,116,126 extending out of the patient through theguide catheter50.
• Asuture cutter210 is threaded along thesutures106,116,126 through theguide catheter50 to the position generally shown inFIG. 19. In this regard, the suture cutter comprises anintermediate catheter portion212 and a distal end portion comprising a cuttingassembly214. The cuttingassembly214 generally comprises ablade housing215 and a reciprocating guillotine-style blade216 slidable mounted therein. Theblade216 includes acutting edge216aas shown best inFIGS. 20A,20B and20C. Theblade216 is mounted for sliding, reciprocating movement within aslot218 ofblade housing215. Theblade216 includes anopening220 through which thesutures106,116,126 extend to cross the path of theblade216 within thehousing215. The blade further includes a connectingend222 coupled to anactuating element224 which may, for example, comprise a wire or other member in a lumen212aofcatheter portion212. Theactuating element224 may be pulled in the direction of the arrow inFIG. 20A to move theblade216 in a proximal direction. The user may accomplish this with a suitable handle or trigger assembly (not shown) coupled toactuator element224 and located outside the patient. Theblade housing215 includes afirst aperture226 at its distal end and asecond aperture228 along a lateral side thereof opposite to thedistal aperture226. In this manner, thesutures106,116,126 may extend into theblade housing215 throughaperture226, opening220 ofblade216 and then throughaperture228 as shown inFIG. 20A. As further shown inFIGS. 20B and 20C, actuatingelement224 may be pulled to move theblade216 in a proximal direction such that thecutting edge216acrosses edge218awith or without a shearing action to cut thesutures106,116,126 at points just proximal tosuture locker132 as generally shown inFIG. 21. Thecutting edge216amay have a double bevel configuration instead of the single bevel design shown.
• The completed annuloplasty or plication procedure is shown inFIG. 22 with theposterior leaflet24 having been moved in an anterior direction to provide better coaptation with theanterior leaflet22 and generally moving theposterior wall42 of theleft ventricle14 in the same anterior direction.
• FIGS. 23-25 illustrate three additional embodiments of anchor assemblies which are only representative of the many variations and substitutions that may be made with respect to the anchor assemblies described herein. For example,FIG. 23 illustrates ananchor assembly230 having a plurality of discrete, flatflexible anchor elements232 coupled along a flexible tensile member such assuture234. Unlikeanchor assemblies102,112,122, theseanchor elements232 are coupled to thesuture234 such that the suture extends through points separated widthwise along therectangular anchor elements232 as opposed to lengthwise. As previously discussed, one or more radiopaque markers232amay be used.FIG. 24 illustrates analternative anchor assembly236 having similar discrete, flatflexible anchor elements238 coupled along a flexibletensile member240 with someanchor elements238 coupled in a lengthwise fashion and some coupled in a widthwise fashion to thesuture240, as shown.FIG. 25 illustrates anotheralternative anchor assembly242 comprised of discrete, flatflexible anchor elements244 coupled for sliding movement along a flexible tensile member such as a suture246. In this embodiment, the option of having differently sized anchor elements is shown as well as the option of having different spacing between coupling points on eachanchor element244 to create different effects, such as fabric bunching, etc. It will be appreciated that many other forms of anchor assemblies utilizing various shapes, sizes and forms of discrete elements coupled for sliding movement along a flexible tensile member may be used with various advantages.
• While the present invention has been illustrated by a description of various preferred embodiments and while these embodiments have been described in some detail, it is not the intention of the Applicants to restrict or in any way limit the scope of the appended claims to such detail. Additional advantages and modifications will readily appear to those skilled in the art. The various features discussed herein may be used alone or in any combination depending on the needs and preferences of the user. This has been a description of illustrative aspects and embodiments the present invention, along with the preferred methods of practicing the present invention as currently known. However, the invention itself should only be defined by the appended claims.

Claims (39)

1. A tissue anchor comprising:

a flexible tensile member; and

a plurality of discrete, flat flexible anchor elements coupled for movement along the flexible tensile member to form an anchor assembly, the flexible tensile member and at least one of the plurality of discrete, flat flexible anchor elements capable of being inserted through tissue and capable of moving between an elongate configuration and a shortened configuration suitable for anchoring against at least one side of the tissue, the anchor assembly having a proximal end portion, a distal end portion, and a compressible intermediate portion between the proximal end portion and the distal end portion;

wherein the anchor elements can slide relative to the flexible tensile member, and the flexible tensile member is capable of being pulled to cause the anchor elements to move relative to the flexible tensile member from the elongate configuration to the shortened configuration.

2. The tissue anchor ofclaim 1, wherein the anchor elements are formed from a material selected from at least one of: natural fibers, synthetic fibers, polymers, metals or combinations thereof.

3. The tissue anchor ofclaim 2, wherein the flexible tensile member further comprises a suture.

4. The tissue anchor ofclaim 1, wherein the flexible tensile member further comprises a suture.

5. The tissue anchor ofclaim 1, further comprising a lock member for retaining the shortened configuration.

6. The tissue anchor ofclaim 5, wherein the lock member further comprises a slip knot in the flexible tensile member.

7. The tissue anchor ofclaim 1, wherein the flexible tensile member extends through multiple locations on each of the anchor elements.

8. The tissue anchor ofclaim 1, wherein the anchor elements are formed from a material that promotes tissue ingrowth.

9. The tissue anchor ofclaim 1, further comprising at least one radiopaque marker on at least one of the anchor elements or the flexible tensile member or both the flexible tensile member and at least one of the anchor elements.

10. The tissue anchor ofclaim 9, further comprising a first radiopaque marker located proximate the proximal end portion when the anchor assembly is in the shortened configuration and a second radiopaque marker located proximate the distal end portion when the anchor assembly is in the shortened configuration.

11. A tissue anchoring system, comprising:

a delivery catheter including a lumen;

a flexible tensile member; and

a plurality of discrete, flat flexible anchor elements coupled for movement along the flexible tensile member to form an anchor assembly, the anchor assembly received in the lumen of the delivery catheter and the flexible tensile member and at least one of the plurality of discrete, flat flexible anchor elements capable of being extended therefrom and inserted through tissue, the anchor assembly further capable of moving between an elongate configuration and a shortened configuration suitable for anchoring against at least one side of the tissue, the anchor assembly having a proximal end portion, a distal end portion, and a compressible intermediate portion between the proximal end portion and the distal end portion;

wherein the anchor elements can slide relative to the flexible tensile member, and the flexible tensile member is capable of being pulled to cause the anchor elements to move relative to the flexible tensile member from the elongate configuration to the shortened configuration.

12. The system ofclaim 11, further comprising:

a deploying device operatively associated with the delivery catheter and operable to extend the anchor assembly from the delivery catheter.

13. The system ofclaim 12, wherein the deploying device further comprises a deploying member capable of pushing the anchor assembly at least partially out of the lumen of the delivery catheter.

14. The system ofclaim 11, wherein the anchor elements are formed from a material selected from at least one of: natural fibers, synthetic fibers, polymers, metals, or combinations thereof.

15. The system ofclaim 11, wherein the flexible tensile member further comprises a suture.

16. The system ofclaim 11, further comprising a lock member for retaining the shortened configuration.

17. The system ofclaim 16, wherein the lock member further comprises a slip knot in the flexible tensile member.

18. The system ofclaim 11, wherein the flexible tensile member extends through multiple locations on each of the anchor elements.

19. The system ofclaim 11, wherein the anchor elements are formed from a material that promotes tissue ingrowth.

20. The system ofclaim 11, further comprising at least one radiopaque marker on at least one of the anchor elements, or the flexible tensile member, or both the flexible tensile member and at least one of the anchor elements.

21. The system ofclaim 11, further comprising a first radiopaque marker located proximate the proximal end portion when the anchor assembly is in the shortened configuration and a second radiopaque marker located proximate the distal end portion when the anchor assembly is in the shortened configuration.

22. A method of anchoring tissue with a first anchor assembly comprised of a first plurality of discrete, flat flexible anchor elements, the first anchor assembly having a proximal end portion, a distal end portion, and a compressible intermediate portion located between the proximal and distal end portions and movable between an elongated configuration and a shortened configuration, the method comprising:

inserting at least one of the anchor elements through the tissue, and

pulling a first flexible tensile member coupled for sliding movement relative to the first plurality of discrete, flat flexible anchor elements to draw the proximal and distal end portions of the first anchor assembly toward each other and to compress the intermediate portion into the shortened configuration with the first anchor assembly engaged against the tissue.

23. The method ofclaim 22, wherein the tissue comprises the mitral valve annulus.

24. The method ofclaim 22, further comprising:

engaging the first anchor assembly against opposite sides of the tissue.

25. The method ofclaim 22, further comprising:

inserting a second anchor assembly through the tissue at a location spaced from the first anchor assembly, the second anchor assembly including a second plurality of discrete, flat flexible anchor elements, the second anchor assembly having a proximal end portion, a distal end portion, and a compressible intermediate portion located between the proximal and distal end portions and movable between an elongated configuration and a shortened configuration;

pulling a first end of a second flexible tensile member coupled for sliding movement relative to the second plurality of discrete, flat flexible anchor elements to draw the proximal and distal end portions of the second anchor assembly toward each other and to compress the intermediate portion into the shortened configuration with the second anchor assembly engaged against the tissue;

drawing the first and second anchor assemblies toward each other to plicate the tissue between the first and second anchor assemblies, and

locking the first and second anchor assemblies in position relative to each other with the tissue plicated therebetween.

26. The method ofclaim 25, wherein the tissue comprises the mitral valve annulus and drawing the first and second anchor assemblies toward each other plicates annulus tissue between the first and second anchor assemblies.

27. The method ofclaim 25, further comprising:

inserting a third anchor assembly through the tissue at a location spaced from the first anchor assembly, the third anchor assembly including a third plurality of discrete, flat flexible anchor elements, the third anchor assembly having a proximal end portion, a distal end portion, and a compressible intermediate portion located between the proximal and distal end portions and movable between an elongated configuration and a shortened configuration;

pulling a first end of a third flexible tensile member coupled for sliding movement relative to the third plurality of discrete, flat flexible anchor elements to draw the proximal and distal end portions of the third anchor assembly toward each other and to compress the intermediate portion into the shortened configuration with the third anchor assembly engaged against the tissue;

drawing at least two of the first, second and third anchor assemblies toward each other to plicate the tissue therebetween; and

locking the first, second and third anchor assemblies in position relative to each other with the tissue plicated therebetween.

28. The method ofclaim 27, wherein the tissue comprises the mitral valve annulus and drawing at least two of the first, second and third anchor assemblies toward each other plicates annulus tissue between at least the two anchor assemblies.

29. A suture cutter for percutaneously cutting a suture located within a patient, comprising:

an actuator for manipulation by a medical professional;

an intermediate catheter portion operatively coupled to the actuator for insertion into the vascular system of the patient; and

a cutting assembly operatively coupled to the intermediate catheter portion and the actuator, the cutting assembly including a blade housing and a blade with a cutting edge mounted for movement in the blade housing, wherein an adjustably sized cutting window is defined between the cutting edge and the blade housing, and the cutting edge cuts a suture received inside of the cutting window as the cutting edge moves in the blade housing to reduce the size of the cutting window.

30. The suture cutter ofclaim 39, further comprising:

an anvil positioned on an opposite side of the cutting window from the cutting edge, wherein the suture is cut against the anvil by the cutting edge.

31. The suture cutter ofclaim 29, further comprising:

a blade receiving space on an opposite side of the cutting window from the cutting edge, wherein the suture is cut as the blade moves into the blade receiving slot.

32. The suture cutter ofclaim 31, wherein the blade receiving space further comprises a slot.

33. The suture cutter ofclaim 31, wherein the blade housing further comprises:

a first aperture on one side of the blade and a second aperture on an opposite side of the blade, wherein the suture is adapted to pass from the first aperture to the second aperture through the cutting window.

34. A method of cutting a suture located within a patient, the method comprising:

positioning a suture cutter within the patient, the suture cutter including a blade movable through an adjustably sized cutting window;

directing a suture through the cutting window;

reducing the size of the cutting window by moving the blade towards the suture; and

cutting the suture with the blade.

35. The method ofclaim 34, wherein positioning the suture cutter further comprises directing the suture cutter into the vascular system of the patient.

36. The method ofclaim 35, wherein directing the suture cutter into the vascular system of the patient further comprises directing the suture cutter through a catheter.

37. The method ofclaim 34, wherein cutting the suture further comprises:

cutting the suture against an anvil.

38. The method ofclaim 34, wherein cutting the suture further comprises:

directing the blade into a blade receiving space past the suture.

39. The method ofclaim 38, wherein the blade receiving space further comprises a slot.

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