Patent Grant
11523900
The present technology relates generally to prosthetic heart valve devices. In particular, several embodiments are directed to heart valve devices for percutaneous replacement of native heart valves and associated systems and methods.
The present technology is generally directed to treatment of heart disease related to valves of the heart such as percutaneous replacement of the mitral valve. Although specific reference is made to percutaneous replacement of the mitral valve, embodiments of the present technology can provide percutaneous or other treatment of other valves such as the aortic valve.
During a normal cycle of heart contraction (systole), when the left ventricle contracts, the mitral valve acts as a check valve to prevent flow of oxygenated blood back into the left atrium. In this way, the oxygenated blood is pumped into the aorta through the aortic valve. Regurgitation of the mitral valve can significantly decrease the pumping efficiency of the heart, placing the patient at risk of severe, progressive heart failure in at least some instances. The mitral valve regurgitation can be characterized by retrograde flow from the left ventricle of a heart through an incompetent mitral valve into the left atrium.
Mitral valve regurgitation can result from a number of mechanical defects of the mitral valve. The mitral valve includes leaflets and chordae tendineae coupled to the leaflets. One or more of the leaflets, the chordae tendineae, or the papillary muscles may be damaged or otherwise dysfunctional. In at least some instances, the valve annulus may be damaged, dilated, or weakened, thereby limiting the ability of the mitral valve to close adequately against the high pressures of the left ventricle.
The prior methods and apparatuses to treat valves of the heart can be less than ideal in at least some instances. Although open heart surgery can be used to repair valves of the heart, such surgery can be more invasive than would be ideal. For example, suturing opposed valve leaflets together, referred to as the “bow-tie” or “edge-to-edge” technique, can result in improved heart function. However, with open heart surgery the patient's chest is opened, typically via a sternotomy, and the patient placed on cardiopulmonary bypass. The need to open the chest and place the patient on bypass can be traumatic and may have associated morbidity.
Although recent advances in percutaneous technologies have resulted in valve therapies that can be less invasive, such percutaneous therapies can be less than ideal and may have less than ideal outcomes in at least some instances. Although clips may be delivered percutaneously to connect leaflets of the mitral valve to perform an edge-to-edge repair, placement of these clips on the mitral valve can be difficult. For example, the mitral valve leaflets can move and change shape with blood flow and contractions of the heart, such that alignment and placement of a clip on the valve can be more difficult than would be ideal in at least some instances. Further, many patients suffer from mitral valve disease which is not treatable with such clips or other percutaneous therapies so are left with no options other than open surgical repair or replacement.
Percutaneous treatment of the mitral valve can present additional challenges as compared with other valves such as the aortic valve. The methods and apparatus appropriate for the aortic valve may not be well suited for use with the mitral valve in at least some instances. The mitral valve includes clusters of chordae tendineae extending from the valve leaflets to the walls of the ventricle that may interfere with placement of the prosthesis. The shape of the mitral valve, rather than being circular and uniform like the aortic valve, can be an oval or kidney-like shape that may not be well suited for supporting conventional stents of cylindrical configuration. The mitral valve annulus can be distorted and may have an unpredictable and non-uniform geometry, as compared to the aortic valve annulus. Further, whereas the aortic valve annulus is often entirely surrounded by muscular tissue, the mitral valve annulus may be bounded by muscular tissue on the outer wall only. The anterior side of the mitral valve annulus is bounded by a thin vessel wall. The thin vessel wall separates the mitral valve annulus and the left ventricular outflow tract (“LVOT”), which must remain open to allow blood to pass into the aorta. As a result, the stent-type fixation upon which prior transcatheter prostheses rely may not be suitable for the mitral valve because the anterior side of the valve has insufficient radial strength and can distort under the radial force of such a stent, risking occlusion of the left ventricular outflow tract. Moreover, mitral valve disease often is accompanied by (or caused by) gradual enlargement of the native annulus and/or the left ventricle. Thus, treatment approaches which rely upon radial engagement with or outward compression against the native annulus are subject to failure as the size and shape of the annulus changes.
In light of the above, it would be desirable to provide improved treatments for heart valves, such as mitral valve replacement. Ideally, these treatments would decrease at least some of the deficiencies of the prior art, and provide improved percutaneous valve prostheses with greater ease of alignment and improved coupling of the prostheses to tissues of the heart.
Many aspects of the present disclosure can be better understood with reference to the following drawings. The components in the drawings are not necessarily to scale. Instead, emphasis is placed on illustrating clearly the principles of the present disclosure. Furthermore, components can be shown as transparent in certain views for clarity of illustration only and not to indicate that the illustrated component is necessarily transparent.
FIGS. 2A1 and 2A2 are side and top views of a prosthetic heart valve device having a valve portion, a support in a delivery configuration and a plurality of arms having an outward configuration configured to reach behind leaflets of the native mitral valve, in accordance with an embodiment of the present technology.
FIG. 2A3 is a top view of the device of FIGS. 2A1 and 2A2 with the support in an expanded configuration and showing the valve open, in accordance with an embodiment of the present technology.
FIG. 2A4 is a top view of the device of FIGS. 2A1 and 2A2 with the support in an expanded configuration and showing the valve closed, in accordance with an embodiment of the present technology.
FIG. 2A5 is a side view of an individual arm in accordance with an embodiment of the present technology.
FIG. 2A6 is a schematic illustration showing a plurality of arms extending around a native leaflet and between chordae of a native mitral valve, in accordance with an embodiment of the present technology.
FIGS. 2A7A-2A7D are side views of tip portions of individual arms, in accordance with various embodiments of the present technology.
FIG. 2A7E is a side view of a portion of a prosthetic heart valve device showing an arm having a curved tip portion oriented inwardly toward the support for retaining a native leaflet around the proximal end of the support, in accordance with an embodiment of the present technology.
FIG. 2A8 is a top view of a prosthetic heart valve device showing a support and a plurality of arms, wherein the arms are in an inward configuration and wherein pressure reducing tip portions of the arms are oriented along a surface of the support, in accordance with an embodiment of the present technology.
FIG. 2A9 is a side view of a prosthetic heart valve device showing arms in an outward configuration at varying splay angles from a support configured in accordance with an embodiment of the present technology.
FIGS. 2A10 and 2A11 are top and side views, respectively, of a support and a plurality of arms arranged in varying splay angles relative to a longitudinal axis of the support configured in accordance with an embodiment of the present technology.
FIG. 2C1 is a top view of the device shown in
FIG. 2C2 is a side view of an individual arm configured to have variable length and in accordance with another embodiment of the present technology.
FIGS. 2C3 and 2C4 are side views of individual arms showing, respectively, a first outward configuration prior to expansion of the support and a second outward configuration after expansion of the support configured in accordance with an embodiment of the present technology.
FIGS. 2C5 and 2C6 are side views of individual arms showing schematically a twisting movement of the arms when transitioning from the first outward configuration (FIG. 2C5) to the second outward configuration (FIG. 2C6), in accordance with an embodiment of the present technology.
FIGS. 2F1-A and 2F1-B are side and top views, respectively, of a prosthetic heart valve device having sealing members configured to be positioned adjacent the commissures of the native valve, and in accordance with another embodiment of the present technology.
FIGS. 2F2-A and 2F2-B are isometric side and top views, respectively, of a prosthetic heart valve device having a bell-shaped skirt tapering from an open downstream end to a closed, narrower upstream end configured in accordance with a further embodiment of the present technology.
FIGS. 2F3A-2F3B and 2F4A-2F4C are side views of a prosthetic heart valve device having alternative skirt configurations in accordance with further embodiments of the present technology.
FIGS. 2F5A and 2F5B are top and cross-sectional side views, respectively, of a prosthetic heart valve device having leaflet pushers shown in an open or separated configuration and in accordance with an embodiment of the present technology.
FIGS. 2F5C and 2F5D are top and cross-sectional side views, respectively, of a prosthetic heart valve device having leaflet pushers shown in a closed or inward configuration in accordance with an embodiment of the present technology.
FIG. 3I1 is a force diagram illustrating the forces exerted on the arms during systole and showing the corresponding forces to the support's struts and posts in accordance with aspects of the present technology.
FIGS. 5A1 to 5A4 are side views of a prosthetic heart valve device having arms with ringed ends configured in accordance with an embodiment of the present technology.
FIG. 5A5 is a partial side view of a prosthetic heart valve device having arms with a first, flattened cross-sectional dimension and a second, elongated cross-sectional dimension such that the arms have a relative resistance to bending in different directions and configured in accordance with an embodiment of the present technology.
FIG. 5A6A shows a portion of the arm along line A-A of FIG. 5A5.
FIG. 5A6B shows a portion of the arm along line B-B of FIG. 5A5.
FIGS. 5A7-5A8 are side and front views, respectively, of prosthetic heart valve devices with arms including arm tips having a bent tip portion for providing a planar subannular interfacing tip configured in accordance with embodiments of the present technology.
FIGS. 5A9-5A10 are partial side views of a prosthetic heart valve device having an arm with loop and two support attachment points. The looped arm can be in an outward configuration (FIG. 5A9) suitable for positioning within a native valve structure, or in an inward configuration (FIG. 5A10) with a low cross-sectional profile suitable for retention in a delivery catheter and configured in accordance with an embodiment of the present technology.
FIG. 5A11 is a perspective view of a further embodiment of a prosthetic heart valve device having a cover thereon in accordance with aspects of the present technology.
FIGS. 5A12-5A15 are partial side views showing various embodiments of covers on arms of a prosthetic heart valve device in accordance with aspects of the present technology.
FIGS. 6A1 to 6B4 are bottom, front, side and isometric views of prosthetic heart valve devices showing arms that cross from a support attachment site on a first side of a support to a leaflet and/or annulus engaging site oriented on a second side of the support opposite the first side and configured in accordance with additional embodiments of the present technology.
FIG. 7A1 is a perspective view of a separate prosthetic valve shown in an expanded configuration and configured for use with an expanded support of a prosthetic heart valve device configured in accordance with an embodiment of the present technology.
FIGS. 7B1 to 7B3 show various components and construction of a temporary valve comprising leaflets, in accordance with embodiments of the present technology.
Specific details of several embodiments of the technology are described below with reference to
With regard to the terms “distal” and “proximal” within this description, unless otherwise specified, the terms can reference a relative position of the portions of a prosthetic valve device and/or an associated delivery device with reference to an operator and/or a location in the vasculature or heart. For example, in referring to a delivery catheter suitable to deliver and position various prosthetic valve devices described herein, “proximal” can refer to a position closer to the operator of the device or an incision into the vasculature, and “distal” can refer to a position that is more distant from the operator of the device or further from the incision along the vasculature (e.g., the end of the catheter). With respect to a prosthetic heart valve device, the terms “proximal” and “distal” can refer to the location of portions of the device with respect to the direction of blood flow. For example, proximal can refer to an upstream position or a position of blood inflow, and distal can refer to a downstream position or a position of blood outflow. For ease of reference, throughout this disclosure identical reference numbers and/or letters are used to identify similar or analogous components or features, but the use of the same reference number does not imply that the parts should be construed to be identical. Indeed, in many examples described herein, the identically numbered parts are distinct in structure and/or function. The headings provided herein are for convenience only.
Overview
Systems, devices and methods are provided herein for percutaneous replacement of native heart valves, such as mitral valves. Several of the details set forth below are provided to describe the following examples and methods in a manner sufficient to enable a person skilled in the relevant art to practice, make and use them. Several of the details and advantages described below, however, may not be necessary to practice certain examples and methods of the technology. Additionally, the technology may include other examples and methods that are within the scope of the claims but are not described in detail.
Embodiments of the present technology provide systems, methods and apparatus to treat valves of the body, such as heart valves including the mitral valve. The apparatus and methods enable a percutaneous approach using a catheter delivered intravascularly through a vein or artery into the heart. Additionally, the apparatus and methods enable other less-invasive approaches including trans-apical, trans-atrial, and direct aortic delivery of a prosthetic replacement valve to a target location in the heart. The apparatus and methods enable a prosthetic device to be anchored at a native valve location by engagement with a subannular surface of the valve annulus and/or valve leaflets. In accordance with various embodiments of the present technology, the valve annulus or leaflets are engaged within a subannular space behind (radially outside of) the native leaflets. In particular embodiments, the subannular surface is engaged by one or more elongated members, or arms, which extend from a location downstream of the native annulus. The elongated members may extend around a downstream edge of at least one native leaflet, and may further pass between two or more chordae tendineae coupled to the native leaflets. The elongated members may have an upstream end configured to engage the subannular surface. In some embodiments, the elongated members are oriented so as to be generally orthogonal to, or at an oblique angle between about 45 and 135 degrees relative to, the subannular surface, such that the loading exerted upon the elongated members is primarily a compressive, axial load. The prosthetic device may comprise a support coupled to the elongated members which contains a prosthetic valve, or which is configured to receive a separately-delivered prosthetic valve, such as a stented valve prosthesis. The elongated members can be configured to maintain the position of the prosthetic device and resist movement in at least the upstream direction when the device is subject to the force of blood pressure downstream of the valve and when the valve is closed.
In some embodiments, the arms of the apparatus may be shorter in length so as to not extend completely into engagement with the annulus tissue behind the leaflets. Additionally, in some arrangement, the arms may comprise short hooks which extend around the free edges of the native leaflets and behind the leaflets only a short distance sufficient to keep the arms from slipping off the leaflets. The arms may alternatively be configured to engage or couple to the chordae, papillary muscles or ventricular walls to enhance anchoring. Moreover, the arms may be configured to remain on the inner sides of the native leaflets and to engage the leaflets themselves, or to penetrate through the leaflets to contact the annulus or other tissue behind the leaflets. All of the various features and characteristics of the arms described herein may be applicable to longer arms, which engage sub-annular tissue, as well as shorter arms or arms which remain on the inner sides of the leaflets. Additionally, devices may include or incorporate a plurality of arms of different length or arms having different modes of engagement with the leaflets or other native tissue.
The devices, systems and methods described herein overcome many of the challenges of previous percutaneous valve replacement approaches. In particular, the apparatus and methods may eliminate the need to rely solely upon radial engagement with an outward force against the native valve annulus in order to anchor the prosthetic device, such as a replacement valve, to the native valve. The apparatus and methods may be well-suited for treating non-circular, asymmetrically shaped valves and bileaflet or bicuspid valves, such as the mitral valve. The apparatus and methods further provide for permanent and reliable anchoring of the prosthetic device even in conditions where the heart or native valve may experience gradual enlargement or distortion.
Some embodiments of the disclosure are directed to prosthetic heart valve devices for implanting at a native valve located between an atrium and a ventricle of a heart of a patient. Such devices are suitable, for example, for implantation at native valves that have an annulus and leaflets coupled to the annulus. In one embodiment, the device can have an expandable support having an outer surface and configured for placement between the leaflets. The device can also have a plurality of arms coupled to or otherwise extending from the expandable support and configured to receive the leaflets between the arms and the outer surface of the expandable support. In some embodiments, at least two arms can have different lengths to extend different distances behind the leaflets to engage a subannular surface of the annulus. In other embodiments, the plurality of arms can be asymmetrically arranged around a circumference of the expandable support and configured to receive the leaflets between the arms and the outer surface. In some examples, asymmetrically arranged arms can be arms with varying distance between adjacent arms. Alternatively or additionally, the arms may be asymmetrically arranged around a longitudinal axis passing through a center of the expandable support, e.g., with more arms disposed on one side of the axis than on an opposite side. In other examples, asymmetrically arranged arms can be arms having varying lengths or varying extension angles, wherein an extension angle is the angle between an upstream extending portion of the arm and the vertical or longitudinal axis of the support. In further examples, asymmetrically arranged arms can be arms having varying splay angles for increasing or decreasing the distance between tip portions of adjacent arms. A person skilled in the art will recognize other ways to asymmetrically arrange arms around the circumference of the expandable support.
In another embodiment, the device can further include a sealing member coupled to at least one of the expandable support and the arms. The sealing member, in some embodiments can be membranes configured to extend from the expandable support into the commissural region of the valve as to inhibit blood flow through a commissural region of a valve. In some embodiments, the device can include two sealing members, which could be membrane structures or rigid structures) oriented on the device to inhibit blood flow through commissural regions of a bicuspid valve (e.g., mitral valve or a bicuspid aortic valve). In another embodiment, the device can include three or more sealing members oriented on the device as to inhibit blood flow through commissural regions of a tricuspid (e.g., aortic valve) or other valve. In a further embodiment, the device can include a single skirt shaped membrane oriented on the device as to inhibit blood flow through gaps formed between the device and the native valve.
Other embodiments of the disclosure are directed to prosthetic heart valve devices for implantation at a native valve region of a heart. In one embodiment, the device can include an expandable support having an upstream portion and a downstream portion. The expandable support can also be configured to be located at the native valve region such that the upstream portion is in fluid communication with a first heart chamber and the downstream portion is in fluid communication with a second heart chamber or portion. In one example, the native valve region can be a mitral valve region and the first heart chamber can be a left atrium and the second heart chamber can be a left ventricle. In another example, the native valve region can be an aortic valve region and the first heart chamber can be a left ventricle and the second heart chamber or portion can be an aorta.
The prosthetic heart valve device can also include a plurality of arms coupled to the expandable support at the downstream portion. The arms, for example, can be formed integrally with the expandable support, or the arms can be separate components that are attached to the expandable support (e.g., spot welded). In one embodiment, each individual arm can be configured to extend from the downstream portion to engage a subannular surface of the native valve region within the second chamber (or portion). In some embodiments, at least some of the individual arms have independently adjustable lengths. In other embodiments, the individual arms can have a base portion, an extension portion and an elbow portion connecting the base portion to the extension portion. The extension portion can be configured, in some embodiments, to engage a subannular surface of the native valve region within the second chamber or portion. In further embodiments, individual arms extend from the support at different splay angles.
Further embodiments of the present technology provide a device to treat a heart valve of a patient, wherein the valve includes an annulus and leaflets coupled to the annulus. The device can include an expandable support comprising an outer surface, an upstream portion and a downstream portion. The support can be configured for placement between the leaflets. The device can also include a plurality of arms coupled to the expandable support. In some arrangements, the plurality of arms can include a first plurality of arms and a second plurality of arms. The first plurality of arms can be arranged on a first portion of the support to receive a first leaflet and the second plurality of arms can be arranged on a second portion of the support to receive a second leaflet. In some examples, the first plurality of arms can include a larger number of arms than the second plurality of arms.
Another embodiment of the present technology provides a device for repair or replacement of a bicuspid heart valve having an annulus, leaflets coupled to the annulus and chordae tendineae coupled to the leaflets. The device can include a hollow support positionable between the leaflets and having an interior to which a valve may be coupled. The device can also include an anchoring portion coupled to the support. The anchoring portion can have an arcuate region configured to extend around a downstream edge of at least one leaflet, an extension region configured to extend from the downstream edge between the chordae tendineae to the annulus, and an engagement region configured to engage a subannular surface of the annulus so as to inhibit movement of the device in an upstream direction. The device can also optionally include a sealing member coupled to at least one of the support and the anchoring portion and extending outwardly from the expandable support into a commissural region of the bicuspid valve so as to occlude the commissural region to inhibit blood flow through the commissural region. In some embodiments, the membrane can be a sealing member configured to engage the commissural region from a ventricle or downstream side of the bicuspid heart valve.
Further embodiments of the disclosure are directed to devices for repair or replacement of a heart valve having an annulus and leaflets coupled to the annulus. In one embodiment, the device can include a cylindrical support configured for placement between the leaflets. The support can include proximal and distal portions, or in other embodiments, upstream and downstream portions. The cylindrical support can also include an interior in which a valve may be coupled. The device can also include a first group of arms (e.g., anchoring arms) coupled to a posterior side of the cylindrical support and a second group of arms (e.g., anchoring arms) coupled to an anterior side of the cylindrical support opposite the posterior side. In one embodiment, each arm can be configured to extend around a downstream edge of a leaflet and extend between the chordae tendineae. Each arm may also engage a subannular surface of the annulus so as to inhibit movement of the support in an upstream direction. In some arrangements, the first group of arms can be configured to engage a first subannular surface along a first line and the second group of arms can be configured to engage a second subannular surface along a second line. In some embodiments, the first and second lines can be non-parallel to the annulus. For example, in one embodiment, the first and second lines are substantially straight, and in another embodiment, the first and second lines can have a curvature substantially larger than a radius of the annulus.
In some embodiments, anchoring arms can be coupled to downstream portions of the cylindrical support and extend outwardly in an upstream direction. The anchoring arms can have distal tips configured to atraumatically engage the annulus of the heart valve. In some arrangements, the plurality of anchoring arms can include a first and second plurality of anchoring arms. The first plurality of anchoring arms can have a characteristic different than the second plurality of anchoring arms. Examples of such arm characteristics can include size, shape, stiffness, splay angle, spacing from the support, and the number of arms disposed within a given area of the support. One of ordinary skill in the art will recognize other arm characteristics that can vary between separate groups of arms coupled to the support and/or associated with the devices disclosed herein.
In a further embodiment, the cylindrical support can have upstream and downstream ends, an interior in which a valve may be coupled, and a perimeter. A plurality of arms can be coupled to the cylindrical support and extend outwardly and in an upstream direction. The arms can include distal tips configured to atraumatically engage the annulus of the heart valve. Further, the arms can be unevenly or otherwise irregularly distributed about the perimeter such that at least a first adjacent pair of arms is spaced closer together than at least a second adjacent pair of arms.
Other embodiments of the disclosure are directed to prosthetic heart valve devices having cylindrical supports having upstream and downstream ends, an interior in which a valve may be coupled and a central longitudinal axis. The devices can also include a plurality of arms extending outwardly from the cylindrical support in an upstream direction. The arms can have distal tips configured to atraumatically engage a subannular surface of a native heart valve. In some embodiments, at least one of the arms can extend outwardly from the longitudinal axis by a greater distance than at least a second of the arms.
A prosthetic heart valve device may also, in some embodiments, include an expandable support having an upstream portion and a downstream portion. The support, for example, can be configured to be located at a native valve region such that the upstream portion is in fluid communication with a first heart chamber and the downstream portion is in fluid communication with a second heart chamber. The device can also include at least one arm coupled to the support and extending in an upstream direction with a distal tip configured to engage an annulus of the native valve region within the second heart chamber. The arm can have a column strength selected to maintain the position of the support relative to the heart valve under the force of blood during systole, e.g., a force of at least about 0.5 lbf exerted against the support in the upstream direction. If multiple arms are utilized, the column strength of each arm can be selected such that in combination the arms maintain the position of the support relative to the heart valve under such a systolic load.
Some devices can include a cylindrical support having a longitudinal axis and an interior along the longitudinal axis through which blood may flow. The device may also include a valve coupled within the interior of the support that is configured to block blood flow through the support in an upstream direction and allow blood flow through the support in a downstream direction. The device can further include a plurality of arms coupled to the support and extending in the upstream direction along an exterior wall or surface of the support. The device may be movable into a plurality of configurations that can include a) a first configuration in which the support is radially contracted and each arm is in an inward position against or adjacent to the exterior wall of the support, b) a second configuration in which the support is radially contracted and each arm is in an outward position spatially separated from the exterior wall by a distance sufficient to receive a leaflet of the heart valve therebetween, and c) a third configuration in which the support is radially expanded and each arm is positioned closer to the exterior wall of the support than in the second configuration.
In many embodiments, an apparatus comprises an expandable support coupled to a plurality of arms. The expandable support may comprise an upstream portion for placement near an upstream portion of the valve and a downstream portion for placement near a downstream portion of the valve. The plurality of arms may extend from the downstream portion and may comprise an inward configuration for placement in a lumen of a catheter and an outward configuration to reach behind the leaflets and engage the annulus. The expandable support and the plurality of arms can be introduced into the patient percutaneously with the plurality of arms comprising the inward configuration and the expandable support comprising a first non-expanded configuration, such that the support and the plurality of arms can be advanced along the lumen of a catheter toward the intended valve. A sheath covering the plurality of arms and the expandable support can be drawn proximally so as to expose the plurality of arms, and the plurality of arms can move outward from the expandable support so as to comprise the outward configuration. In the outward configuration, the plurality of arms can extend, in some embodiments, between chordae tendineae of the mitral valve and receive the leaflets between the plurality of arms and the support. The support can be moved upstream with the leaflets received between the plurality of arms and the support so as to guide the plurality of arms toward the annulus. When the support has moved upstream a sufficient distance, the plurality of arms can engage the annulus with the leaflets extending substantially between the plurality of arms and the support such that the plurality of arms can engage the annulus with direct contact and with decreased interference of the leaflets. The expandable support can be expanded to an expanded configuration when the plurality of arms engages the annulus in the outward configuration. The arms may have sufficient flexibility to deflect inwardly or outwardly relative to the support sufficiently to accommodate any expansion or distortion of the native annulus which may occur in a heart afflicted with mitral valve disease, congestive heart failure, or other conditions.
A valve can be provided which is configured to be coupled to the support when the support is in the expanded configuration. The valve may be delivered separately from the support and coupled to the support after the support has been implanted at the native valve site. Alternatively the valve may be pre-mounted to the support and delivered with it to the target site. The valve may also be a temporary valve which regulates blood flow through the support for a temporary period, e.g. 15 minutes to 3 days, until a permanent prosthetic valve is delivered and coupled to the support. The valve can be supported with the plurality of arms engaging the ventricular side of the annulus behind the leaflets with the arms in the outward configuration, such that the valve is supported by direct coupling to the native annulus. This engagement of the annulus by the plurality of arms can provide safe and reliable coupling to the native valve. The integrity of neighboring tissues and structures can be substantially maintained and blood flow through the aortic outflow tract can be substantially unimpeded. The arms may comprise sufficient strength to support the valve and maintain its position during systole, and the strength may comprise a column strength which keeps the arms from buckling or fracturing under the force of blood against the valve coupled to the support.
The plurality of arms may comprise one or more structures to couple to the annulus of the valve. Each of the plurality of arms may comprise a tip portion to inhibit penetration of the annulus. The tip portion may comprise a cross-sectional size to inhibit excessive penetration of the annulus. The plurality of arms may comprise a portion to provide deflection of the tip portion.
Each of the plurality of arms may comprise a mechanism to vary the length of the arm, such as a telescopic component. The mechanism may comprise a locking mechanism which locks when the plurality of arms engage the annulus. Alternatively or in combination, the plurality of arms can be shaped to engage the annulus of the mitral valve. A first plurality of arms can be configured to engage a first portion of the annulus on a first side of the support and a second plurality of arms can be configured to engage a second portion of the annulus on a second side of the support. Each of the first plurality of arms and the second plurality of arms may be splayed outwardly from a surface of the support and configured to pass between chordae coupled to the leaflets with minimal interference therewith.
In many embodiments, the support can be configured to receive an expandable valve when the support is in the expanded configuration. The expandable valve may comprise an expandable stented valve, and the support may comprise retaining structures to couple to the expandable stented valve with one or more of friction, compression, or interlocking elements. In some embodiments, the expandable support is configured to receive an expandable aortic stented valve when the support is placed in the mitral valve. The support may be disposed in the expanded configuration when coupled to the expandable aortic stented valve and configured such that the support and the plurality of arms substantially maintain the shape and size of the native annulus and do not extend excessively into the aortic outflow tract so that blood flow through the aortic outflow tract is substantially unimpeded.
Certain embodiments of the present technology provide an apparatus to treat a mitral valve located between an atrium and a ventricle of a heart of a patient. The mitral valve has an annulus, leaflets coupled to the annulus, and chordae tendineae coupled to the leaflets. The apparatus comprises an expandable support comprising an outer surface. The expandable support is configured for placement between the leaflets and comprises an upstream portion and a downstream portion. A plurality of arms is coupled to the expandable support. The plurality of arms is configured to receive the leaflets between the arms and the outer surface and extend behind the leaflets so as to engage the annulus.
In many embodiments, the plurality of arms is configured to engage the annulus so as to inhibit movement of the support toward the atrium. The plurality of arms collectively may have column strength sufficient to support a systolic load of at least about 2 to 5 lbf exerted in the axial direction on the support. In some embodiments, each arm may be configured to support an axial compressive load of at least about 0.2 lbf, and in other embodiments, at least about 0.5 lbf.
In many embodiments, a valve is coupled to the support and is configured to inhibit retrograde blood flow when the left ventricle of the heart contracts, and the plurality of arms extends from the support to the annulus so as to couple the valve to the annulus.
In many embodiments, the plurality of arms is configured to contact the leaflets so as to further resist movement of the support. Each of the plurality of arms can be separated from the outer surface by a gap distance sized to receive the leaflets such that the leaflets are received between the plurality of arms and the support. The gap distance associated with each of the plurality of arms can be sized to guide the plurality of arms toward the annulus. Each of the plurality of arms can be independently deflectable to vary the gap distance if engaged by tissue during positioning. The arms may further be configured to be movable from a first position having a first gap distance to a second position having a second gap distance, the first gap distance being larger than the second gap distance. The arms may be moved automatically from the first position to the second position when the support is expanded to the expanded configuration, or the arms may be actively movable on demand either before or after the support is expanded. The arms may further be movable to a third position having a gap distance even smaller than in the first or second positions, in which the arms have a minimal profile so as to facilitate endovascular delivery to the target site. The arms may have an unbiased configuration which corresponds to either the first, second, or third positions.
In another aspect, embodiments of the present technology provide a method of treating a mitral valve of a patient, in which the mitral valve has an annulus and leaflets. The method comprises placing an apparatus comprising an expandable support coupled to a plurality of arms along the mitral valve such that the plurality of arms engages the annulus behind the leaflets.
In a further aspect, embodiments of the present technology provide a system to treat a mitral valve of a patient, in which the mitral valve has an annulus. The system comprises an apparatus to treat the mitral valve as described herein and a catheter having the apparatus within a lumen of the catheter.
In yet another aspect, embodiments of the present technology provide a method of treating a valve of heart of a patient. The valve has an annulus and leaflets. The method can include implanting a device as described herein within or adjacent to the annulus. The device, in some embodiments, can include an expandable support coupled to a plurality of arms. The support can be disposed between the leaflets and the plurality of arms can be configured to engage the annulus behind the leaflets. Accordingly, the method can also include engaging a surface of the annulus behind the leaflets by a plurality of arms coupled to the expandable support so as to inhibit movement of the support, and, in some embodiments, include coupling a valve to the support to allow blood flow in a first direction through the support and inhibit blood flow in a second direction through the support.
In another aspect, embodiments of the present technology provide an apparatus to treat a valve of a patient, in which the valve comprises an annulus and leaflets coupled to the annulus. An expandable support comprises an outer surface, and the expandable support is configured for placement between the leaflets. The expandable support comprises an upstream portion and a downstream portion when placed between the leaflets. A plurality of arms is coupled to the expandable support and extends from the downstream portion. The plurality of arms comprises a first plurality of arms and a second plurality of arms. The first plurality of arms is arranged on a first portion of the support to receive a first leaflet, and the second plurality of arms is arranged on a second portion of the support to receive a second leaflet. At least some of the first and second plurality of arms engage the annulus behind the first and second leaflets so as to inhibit movement of the support. A temporary or permanent valve may be coupled to the support to allow blood flow in a first direction and inhibit blood flow in a second direction.
In a further aspect of the technology, a method of securing a treatment device at a location proximate a native valve of a heart of a patient. The method can include passing a first arm of the treatment device around a free edge of the first leaflet into a first subannular space behind the first leaflet; passing a second arm of the treatment device around a free edge of the second leaflet into a second subannular space behind the second leaflet; and engaging a surface of the annulus behind the leaflets with the first and second arms to inhibit movement of the treatment device in an upstream direction relative to the native valve.
In another aspect, an apparatus to treat a valve of a patient includes an expandable support comprising an outer surface, the expandable support configured for placement between the leaflets and comprising an upstream portion and a downstream portion; and a plurality of arms coupled to the expandable support, the plurality of arms comprising a first plurality of arms and a second plurality of arms, the first plurality of arms arranged on a first portion of the support to receive a first leaflet, the second plurality of arms arranged on a second portion of the support to receive a second leaflet.
In a further embodiment, an apparatus for repair or replacement of a heart valve having an annulus, leaflets coupled to the annulus, and chordae tendineae coupled to the leaflets, comprises a support portion positionable between the leaflets and having an interior to which a valve may be coupled; an anchoring portion coupled to the support portion, the anchoring portion having a turning region configured to extend around a downstream edge of at least one leaflet, an extension region configured to extend from the downstream edge between the chordae tendineae to the annulus, and an engagement region configured to engage the annulus so as to inhibit movement of the apparatus in an upstream direction.
In still another aspect, the present technology provides an apparatus for repair or replacement of a heart valve having an annulus, leaflets coupled to the annulus, and chordae tendineae coupled to the leaflets, the apparatus comprising a cylindrical support configured for placement between the leaflets, the support having upstream and downstream ends and an interior in which a valve may be coupled; a first group of arms coupled to the support along a posterior side thereof; and a second group of arms coupled to the support along an anterior side thereof opposite the posterior side; wherein each arm is configured to extend around a downstream edge of a leaflet, between the chordae tendineae and into engagement with the annulus so as to inhibit movement of the support in an upstream direction.
In another embodiment, an apparatus for repair or replacement of a heart valve having an annulus can include a cylindrical support configured for placement between the leaflets, the support having upstream and downstream ends and an interior in which a valve may be coupled; and a plurality of arms coupled to the cylindrical support and extending in an upstream direction with distal tips configured to engage annulus tissue of the heart valve; wherein a first plurality of the arms have a characteristic different than at least a second plurality of the arms, the characteristic being selected from size, shape, stiffness, angle, spacing from the support, or the number of arms within a given area of the support.
In another aspect of the present technology, an apparatus for repair or replacement of a heart valve having an annulus is provided. The apparatus can comprise a cylindrical support having upstream and downstream ends, an interior in which a valve may be coupled, and a perimeter; and a plurality of arms coupled to the cylindrical support and extending in an upstream direction with distal tips configured to atraumatically engage annulus tissue of the heart valve; wherein the arms are unevenly distributed about the perimeter such that at least a first adjacent pair of arms is spaced closer together than at least a second adjacent pair of arms.
In a further embodiment, an apparatus for repair or replacement of a heart valve having an annulus can include a cylindrical support having upstream and downstream ends, an interior in which a valve may be coupled, and a central longitudinal axis; and a plurality of arms coupled to the cylindrical support and extending in an upstream direction with distal tips configured to engage annulus tissue of the heart valve; wherein at least one of the arms extends outwardly a greater distance from the longitudinal axis than at least a second of the arms.
In still another aspect, the present technology provides an apparatus for repair or replacement of a heart valve having an annulus which comprises a cylindrical support having upstream and downstream ends and an interior in which a valve may be coupled; and at least one arm coupled to the cylindrical support and extending in an upstream direction with a distal tip configured to engage the annulus of the heart valve behind a leaflet thereof, the at least one arm having a column strength selected to maintain the position of the support relative to the heart valve under a force of at least about 0.5 lbf exerted against the support in the upstream direction.
In a further aspect of the present technology, an apparatus for replacement of a heart valve comprises a cylindrical support having an interior through which blood may flow; a valve coupled within the interior of the support and configured to block blood flow through the support in an upstream direction and allow blood flow through the support in a downstream direction; and a plurality of arms coupled to the support and extending in the upstream direction along an exterior wall of the support; wherein the apparatus is movable into a plurality of configurations comprising a first configuration in which the support is radially contracted and each arm is in an inward position against or adjacent to the exterior wall of the support; a second configuration in which the support is radially contracted and each arm is in an outward position separated from the exterior wall by a distance sufficient to receive a leaflet of the heart valve therebetween; and a third configuration in which the support is radially expanded and each arm is positioned closer to the exterior wall of the support than in the second configuration.
Additional aspects of the present technology are described further herein. It is contemplated that the embodiments as described herein may be combined in many ways, and any one or more of the elements recited in the claims can be combined together in accordance with embodiments of the present technology and teachings as described herein.
Embodiments of the present technology as described herein can be combined in many ways to treat one or more of many valves of the body including valves of the heart such as the mitral valve. The embodiments of the present technology can be therapeutically combined with many known surgeries and procedures, for example, such embodiments can be combined with known methods of accessing the valves of the heart such as the mitral valve with antegrade or retrograde approaches, and combinations thereof.
Cardiac Physiology
The left ventricle LV of a normal heart H in systole is illustrated in
Referring now to
Regurgitation also occurs in the patients suffering from cardiomyopathy where the heart is dilated and the increased size prevents the valve leaflets LF from meeting properly, as shown in
FIGS. 1C1, 1C2, and 1E further illustrate the shape and relative sizes of the leaflets L of the mitral valve. It may be seen that the overall valve has a generally kidney-like shape, with a long axis MVA1 and a short axis MVA2. In healthy humans the long axis MVA1 is typically within a range from about 33.3 mm to about 42.5 mm in length (37.9+/−4.6 mm), and the short axis MVA2 is within a range from about 26.9 to about 38.1 mm in length (32.5+/−5.6 mm). However, with patients having decreased cardiac function these values can be larger, for example MVA1 can be within a range from about 45 mm to 55 mm and MVA2 can be within a range from about 35 mm to about 40 mm. The line of coaptation C is curved or C-shaped, thereby defining a relatively large anterior leaflet AL and substantially smaller posterior leaflet PL (FIG. 1C1). Both leaflets appear generally crescent-shaped from the superior or atrial side, with the anterior leaflet AL being substantially wider in the middle of the valve than the posterior leaflet. At the opposing ends of the line of coaptation C the leaflets join together at corners called the anterolateral commissure AC and posteromedial commissure PC, respectively.
Mitral valve regurgitation can also occur in patients who have suffered ischemic heart disease where the functioning of the papillary muscles PM is impaired, as illustrated in
A person of ordinary skill in the art will recognize that the dimensions and physiology of the patient may vary among patients, and although some patients may comprise differing physiology, the teachings as described herein can be adapted for use by many patients having various conditions, dimensions and shapes of the mitral valve. For example, work in relation to the present disclosure suggests that some patients may have a long dimension across the annulus and a short dimension across the annulus without well defined peak and valley portions, and the methods and apparatus as described herein can be configured accordingly.
Access to the Mitral Valve
Access to the mitral valve or other atrioventricular valve can be accomplished through the patient's vasculature in a percutaneous manner. By percutaneous it is meant that a location of the vasculature remote from the heart is accessed through the skin, typically using a surgical cut down procedure or a minimally invasive procedure, such as using needle access through, for example, the Seldinger technique. The ability to percutaneously access the remote vasculature is well-known and described in the patent and medical literature. Depending on the point of vascular access, the approach to the mitral valve may be antegrade and may rely on entry into the left atrium by crossing the interatrial septum. Alternatively, approach to the mitral valve can be retrograde where the left ventricle is entered through the aortic valve. Once percutaneous access is achieved, the interventional tools and supporting catheter (s) may be advanced to the heart intravascularly and positioned adjacent the target cardiac valve in a variety of manners, as described herein.
Using a trans-septal approach, access is obtained via the inferior vena cava IVC or superior vena cava SVC, through the right atrium RA, across the interatrial septum IAS and into the left atrium LA above the mitral valve MV.
As shown in
As shown in
The antegrade or trans-septal approach to the mitral valve, as described above, can be advantageous in many respects. For example, the use of the antegrade approach will usually allow for more precise and effective centering and stabilization of the guide catheter and/or prosthetic valve apparatus. Precise positioning facilitates accuracy in the placement of the prosthetic valve apparatus. The antegrade approach may also reduce the risk of damaging the subvalvular apparatus during catheter and interventional tool introduction and manipulation. Additionally, the antegrade approach may decrease risks associated with crossing the aortic valve as in retrograde approaches. This can be particularly relevant to patients with prosthetic aortic valves, which cannot be crossed at all or without substantial risk of damage.
An exemplary retrograde approach to the mitral valve is illustrated in
In some instances, a retrograde arterial approach to the mitral valve can be preferred due to its advantages. Use of the retrograde approach can eliminate the need for a trans-septal puncture. The retrograde approach is also more commonly used by cardiologists and thus has the advantage of familiarity.
An additional approach to the mitral valve is via trans-apical puncture, as shown in
The trans-apical approach has the advantage of providing a shorter, straighter, and more direct path to the mitral or aortic valve. Further, because it does not involve intravascular access, it can be performed by surgeons who may not have the necessary training in interventional cardiology to perform the catheterizations of other percutaneous approaches.
The prosthetic treatment apparatus may be specifically designed for the approach or interchangeable among approaches. A person of ordinary skill in the art can identify an appropriate approach for an individual patient and design the treatment apparatus for the identified approach in accordance with embodiments described herein.
Orientation and steering of the prosthetic valve apparatus can be combined with many known catheters, tools and devices. Such orientation may be accomplished by gross steering of the device to the desired location and then refined steering of the device components to achieve a desired result.
Gross steering may be accomplished by a number of methods. A steerable guidewire may be used to introduce a guide catheter and the prosthetic treatment apparatus into the proper position. The guide catheter may be introduced, for example, using a surgical cut down or Seldinger access to the femoral artery in the patient's groin. After placing a guidewire, the guide catheter may be introduced over the guidewire to the desired position. Alternatively, a shorter and differently shaped guide catheter could be introduced through the other routes described above.
A guide catheter may be pre-shaped to provide a desired orientation relative to the mitral valve. For access via the trans-septal approach, the guide catheter may have a curved, angled or other suitable shape at its tip to orient the distal end toward the mitral valve from the location of the septal puncture through which the guide catheter extends. For the retrograde approach, as shown in
Treatment of Cardiac Valves
Embodiments of the present technology as described herein can be used to treat one or more of the valves of the heart as described herein, and can be used for treatment of the mitral valve, or in other embodiments, the aortic valve.
FIGS. 2A1 and 2A2 show side and top views of a prosthetic treatment apparatus 100 comprising a valve 150 mounted to a support 110 disposed in a delivery configuration 111, and a plurality of arms 120 in an outward configuration 123 to reach behind leaflets of the mitral valve into the subannular space on the ventricular side of the native annulus. The support 110 is generally cylindrical, being formed around a longitudinal axis 110A. The support 110 comprises an expandable skeleton 140 from which the plurality of arms 120 extend. The support 110 may further comprise a covering (not shown) disposed around the exterior and/or interior walls of the skeleton 140 to block blood flow through the walls of skeleton 140 and/or to promote in-growth of tissue. The arms 120 may also be covered by a coating or covering (not shown) to promote in-growth. The arms 120 can be configured to engage the native annulus such that the valve 150 is supported by the annulus when valve 150 is closed during systole. The plurality of arms 120 can have a column strength to support the valve 150 and maintain its general position relative to the native heart tissue by engaging the annulus as described herein.
The support 110 comprises an upstream portion 112 and a downstream portion 114 and an outer surface 110S. As used herein, “upstream” shall mean the direction from which blood normally flows through the heart or valve in question, while “downstream” shall mean the direction toward which blood normally flows. In the case of the mitral valve, “upstream” means the direction toward or closer to the left atrium or superior aspect of the heart, while “downstream” means the opposite direction, toward or closer to the left ventricle or inferior aspect of the heart. For the aortic valve, “upstream” means the direction toward the left ventricle or inferior end of the heart, while “downstream” means the direction toward or closer to the aorta or aortic arch. In one embodiment, the support 110 comprises a first side 110S1 and a second side 110S2. A first plurality of arms 120A comprising first tip portions 122A can be mounted to the support 110 on the first side 110S1 and a second plurality of arms 120B comprising second tip portions 122B can be mounted to the support 110S on the second side 110S2. A first midline 110M divides the support roughly in half between the first side 110S1 and the second side 110S2, intersecting axis 110A. A second midline 110M2 extends transverse to the first midline 110M, intersecting the midline 110M at the center of the support 110 (FIG. 2A2).
The skeleton 140 may be comprised of a plurality of thin interconnecting members referred to herein as struts 142 or posts 144, arranged in a variety of geometrical patterns. Alternatively, the skeleton 140 may comprise a mesh or woven construction. In one embodiment, the skeleton 140 can include a plurality of struts 142 and a plurality of posts 144. The plurality of posts 144 can extend along an axial direction generally parallel to the longitudinal axis 110A and the struts 142 can extend circumferentially around the longitudinal axis 110A. The struts 142 can form a series of rings around the longitudinal axis 110A, wherein each ring can have a circumferentially expandable geometry. In the example shown, struts 142 are formed in sinusoidal configuration. Zig-Zags, closed cells, open cells, or other expandable configurations are also possible. The plurality of struts 142 can attach to the plurality of posts 144 so as to define a plurality of nodes 110N. The plurality of struts 142 and the plurality of posts 144 may comprise a deformable material or a resilient or shape memory material as described herein. In some embodiments, the plurality of arms 120 may be attached to or otherwise formed integrally with the downstream ends 114a of the posts 144 or to locations along the struts 142, or a combination thereof. In other embodiments, the arms 120 can extend from or be coupled to anywhere on the skeleton 140, for example, to an outer surface of a post 144 or strut 142 along the longitudinal axis 110A of the skeleton 140.
The plurality of arms 120 are configured to reach behind the leaflets of the valve and to engage the native annulus. Each of the plurality of arms 120 can comprise a tip portion 122 (e.g., a distal tip) to contact the annulus and a base portion 124 to couple the arm 120 to the support 110. Contact with the annulus may occur, for example, in the annular groove defined by the intersection of the superior portion of the ventricular wall and the root portion the ventricular surface of the mitral leaflets. In one embodiment, the arms 120, when engaging the annulus, are oriented so as to be generally orthogonal to, or at an oblique angle between about 45 and 135 degrees relative to, the subannular surface, such that the loading exerted upon the arms 120 is primarily a compressive, axial load. The tip portion 122 may alternatively be positioned more downstream, that is, anywhere along the ventricular surface of the mitral leaflets or along the ventricular wall. Likewise, the tip portions 122 may not be in substantial contact with any heart structure if, for example, engagement of the plurality of the arms 120 with the chordae tendineae leave the plurality of arms 120 positioned such that the tip portions 122 extend into free space.
Each of the plurality of arms 120 are separated from the support 110 with a gap distance 130 sized to receive the leaflet between each arm 120 and the outer surface 110S of support 110. An elbow portion 126 extends in a downstream direction from the base portion 124 and then makes a turn of about 120-180 degrees in the upstream direction. Each of the plurality of arms 120 may comprise an extension portion 127 extending between the curved elbow portion 126 and the tip portion 122. The elbow portion 126 may comprise a U-shaped curve 126U that extends to the extension portion 127. In some embodiments, the elbow portion 126 can have an arcuate shape, however, in other embodiments, the elbow portion can include a more triangular shape or a square shape that permits redirection of the arm 120 from a downstream trajectory to an upstream trajectory. Each of the plurality of arms 120 can extend a distance 139 below the downstream end 114a of the downstream portion 114 of the support 110. The curved elbow portion 126 can extend around an axis 126A located below the downstream end of the support 110. Each of the plurality of arms 110 extends upstream a distance 138 from the downstream end of curved elbow portion 126 to the tip portion 122 so that the tip 122 can engage the native valve annulus while the curved elbow portion 126 can accommodate the downstream edge of the native leaflet. Optionally, the arms 120 may be configured such that the native leaflet is compressed, folded or bunched up toward the annulus when the tip portion 122 is in engagement with the annulus.
The tip portion 122 of each of the plurality arms 120 can be shaped to inhibit penetration of or injury to the annulus. The tip portion 122 may comprise a pressure reducing tip portion 122PR shaped so that the surface area of the tip portion 122 of the arm 120 contacting the annulus is greater than a cross sectional area of the arm 120 away from the tip portion 122.
The tip portions can be oriented so as to have a low profile when the support 110 is disposed in a delivery configuration 111 (FIG. 2A2) and have an engagement profile when the support 110 is in an expanded configuration 113 (FIG. 2A3). Tip portions 122A can be curved or bent around an axis generally parallel to longitudinal axis 110A so that the tips point toward the second midline 110M2 (FIG. 2A2).
Referring to FIGS. 2A2, 2A3 and 2A4 together, the valve 150 can be configured in many ways and may comprise one or more of a temporary valve, a replaceable valve, a removable valve or a permanent valve. The valve 150 comprises a plurality of leaflets 152. In one embodiment, valve 150 has a tri-leaflet configuration, although various alternative valve configurations may be used, such as a bi-leaflet configuration. The valve 150 is adapted to allow blood flow in the downstream direction and to block blood flow in the upstream direction.
FIG. 2A3 shows the apparatus of FIGS. 2A1 and 2A2 with the support 110 in an expanded configuration 113 and the valve open 150. Additionally, FIGS. 2A3-2A4 illustrate an alternative configuration for tip portions 122A, wherein tip portions 122A are bent or curved around an axis transverse to the longitudinal axis 110A so that the tips 122 point generally toward the center of support 110 or toward midline 110M.
FIG. 2A4 shows the apparatus of FIGS. 2A1 and 2A2 with the support 110 comprising the expanded configuration 113 and the valve 150 closed.
FIG. 2A5 shows the geometry and dimensions of an individual arm 120. The arm 120 comprises the elbow portion 126 that can extend the distance 139 below the downstream end of support 110 (not shown in FIG. 2A5). The distance 139 can be within a range from about 0 to about 15 mm, for example about 4 mm. The arm 120 can extend from the lower end of the elbow portion 126 to the tip 122 a distance 137. The distance 137 can be from about 10 mm to about 35 mm, for example about 20 mm. The extension portion 127 can extend at an extension angle 135 relative to the longitudinal axis 110A of the support 110. The extension angle 135 can be within a range from about 10 degrees to about 50 degrees, for example about 25 degrees. The extension angle 135 can determine a gap distance 130 between the tip portion 122 and the outside surface 110S of the support 110.
FIG. 2A6 shows an apparatus 100 implanted at a native valve location in the heart. The arms 120 of the apparatus 100 extend around a leaflet LF between chordae CT of a mitral valve. In some embodiments, the arms 120 on one side of the apparatus 100 can be configured to extend through a gap in the chordae CT near the center of the native leaflet LF. The arms 120 can be sized to extend to the annulus and engage the annulus with the tip portions 122. The arms 120 are splayed circumferentially so that tip portions 122 are spaced apart along the native annulus so as to distribute the load across a wider area of the native subannular surface.
The tip portions 122 may have a variety of configurations adapted to distribute force and minimize tissue injury or penetration of the annulus. FIG. 2A7A shows an arm 120 having a pair of curved tips 122SK on the tip portion 122. The pair of curved tips 122SK of tip portion 122 may comprise curved tips which are sufficiently flexible to be deflected in the downstream direction when engaged by the annulus. The curved tips 122SK may have sufficient resiliency to be biased in an upstream direction toward the annulus so as to maintain contact with the annulus. In this way, the varying elevation of the annulus can be accommodated by the arms 120 so that each of the arms 120 can engage the annulus and bear some of the load exerted on the support 110. Alternatively, the tip portion 122 may comprise round balls as shown in FIG. 2A7B, flattened disk-like structures as shown in FIG. 2A7C, rings as shown in FIG. 2A7D, or other structures. Moreover, in some embodiments, the tip portions 122 are configured to interact cooperatively with the support 110 to enhance engagement with the native valve leaflets. In one configuration, the tip portions 122 point inwardly toward the longitudinal axis 110A and extend over the upstream end of the support 110 such that the native leaflets are sandwiched or compressed between the arms 120 and the support 110 and are folded around the upstream end 112a of the upstream portion 112 of support 110 as shown in FIG. 2A7E.
FIG. 2A8 shows a top view of an apparatus 100 wherein the maximum dimension 122MD across each pressure reducing tip portion 122PR is oriented so as to extend generally parallel to the outer surface 110S of the support 110. When the support 110 is in the delivery configuration 111 and the plurality of arms 120 are in the inward configuration 121, the tip portions 122 can nest and conform to the outer surface 110S to decrease the cross-sectional size of the apparatus 100. In some embodiments, adjacent pressure reducing tip portions 122PR can be touching or pressed together on the outer surface 110S of the support 110, or in other embodiments, the pressure reducing tip portions 122PR can be spaced apart along the outer surface 110S by a space 122PRA such that each arm 120 can have a low profile against the support 110 while in the inward configuration 121.
In another embodiment, FIGS. 2A9-2A10 show splay angles of the plurality of arms 120. The support 110 is shown in the delivery configuration 111 and the plurality of arms 120 are shown in the outward configuration 123. Each arm 120 extends from the elbow portion 126 toward the tip portion 122 at unique and variable splay angles off a midline (e.g., the second midline 110M2) such that the plurality of arms 120 are splayed away from each other. In the example shown in FIGS. 2A9 and 2A10, the arms 120 (e.g., arm 120z) closest to the second midline 110M2 can have a first splay angle 126SA1 and the arms 120 (e.g., arm 120x) farther from the midline 110M2 can have a second splay angle 126SA2 larger than the first splay angle 126SA1. In this example, the tip portions 122 can be spaced apart with respect to each other tip portion 122 and can span a wider distance while contacting the native annulus. In this embodiment, it can be possible to more widely distribute a load on the subannular surface (e.g., pressure or force exerted on the apparatus 100 against the subannular surface of the native annulus at the points of contact with the tip portion 122) when the second/downstream heart chamber contracts. In another configuration, the splay angles 126SA1, 126SA2 are selected such that the individual tip portions 122 of each of the groupings (e.g., rows 128A and 128B shown in FIG. 2A10) of arms 120 on each side of support 110 are clustered together near the midline 110M2. The splay angles may also be selected such that the curved elbow portion 126 forms a helical curve. Alternatively, or in combination, the elbow portion 126 can be twisted such that the extension portion 127 extends to the tip 122 at the selected splay angle. One of ordinary skill will understand that each arm 120 can project from the support 110 at a unique and variable splay angle, with respect to other splay angles of additional arms 120 on the support 110, for accommodating a variety of native structures having differing shapes, sizes and load-bearing potential.
FIGS. 2A10 and 2A11 show top and side views of angles of the plurality of arms 120 relative to the longitudinal axis 110A and configured for treatment of a bi-leaflet or bicuspid valve such as the mitral valve. The support 110 is shown in the delivery configuration 111 and the plurality of arms 120 in the outward configuration 123. The arms 120 are arranged such that tip portions 122 form a first row 128A on the first side 110S1 of the first midline 110M and a second row 128B on the second side 110S2 of the first midline 110M. In one embodiment, the other two sides of support 110, offset roughly 90 degrees from sides 110S1 and 110S2, may have no arms or a much smaller number or lower density of arms than on sides 110S1 and 110S2. In some embodiments, the circumferential distance between an outside arm 120x in row 128A and an outside arm 120y in row 128B can be substantially larger than the space between adjacent arms (e.g., arm 120x and arm 120z) in the same row (row 128A or 128B).
First and second rows 128A, 128B of arms 120 may each form a generally straight line, or in other arrangements, may form a peaked or arrow-like shape. In additional arrangements, the arms 120 can be arranged in a curvilinear fashion with a curvature generally matching that of the natural curvature of the native annulus. In some embodiments of devices suitable for treating the mitral valve, which can have a large oval or kidney-like shaped annulus, tip portions 122 in the expanded configuration can be arranged to mimic or match the oval or kidney-like shape of the native annulus and can have a radius of curvature substantially larger than the radius of curvature of support 110. For example, support 110 may have a radius of curvature of about 10-20 mm when expanded, while tip portions 122 may be arranged in a curve having a radius of about 15-30 mm. The first side 110S1 and the second side 110S2 are each divided by the second midline 110M2. To extend the radius of curvature of the tip portions 122 of the collective plurality of arms 120, the arms can have varying splay angles (e.g., splay angles 126SA1 and 126SA2) as discussed above, and the arms 120 can be extended from the longitudinal axis 110A at variable extension angles 135 (shown individually as 135a and 135b in FIG. 2A11). The extension portion 127 of each arm 120 can extend at an extension angle 135 relative to the longitudinal axis 110A and/or the outside surface 110S of the support 110. In one embodiment, and as shown in FIG. 2A11, the arms furthest from the second midline 110M2 can extend at an extension angle 135b relative to the longitudinal axis 110A and the arms closest to the second midline 110M2 can extend at an extension angle 135a relative to the longitudinal axis 110A, wherein the extension angle 135b is greater than extension angle 135a. Referring to FIG. 2A11, the extension portion 127 of the arm 120z closest to midline 110M2 extends with a first extension angle 135a relative to longitudinal axis 110A and extension portion 127 of the arm 120x located farther from midline 110M2 than arm 120z, extends with a second extension angle 135b, wherein the second extension angle 135b is greater than the first extension angle 135a such that the plurality of tips 122 on first side 110S1 are linearly aligned to form a generally straight first row 128A and/or have a radius of curvature greater than a radius of curvature of the support 110. For a tri-leaflet or tricuspid valve, arms 120 may be arranged in three groups or rows offset by about 120 degrees from each other circumferentially around the support 110, rather than two groups or rows on opposing sides of the support 110. In other embodiments, the support 110 can accommodate more than three groupings or rows of arms 120.
The arms 120 can include J-hooks, fingers, columns, posts, wires, tubes, ribbons or similar structures having properties such as column strength, flexibility, resilience, etc., suitable for bearing a load or force exerted on the apparatus 100. The arms 120 can have various cross-sectional geometries, including round or polygonal, and can have different geometries at different locations along their length. For example, the curved elbow portions 126 may be circular in cross-section, while other regions of the arms 120, such as those that engage the native leaflets may be more flattened to have a broader area of contact with the leaflets. Referring to
In other embodiments, the arms 120 are shorter in length so as to extend only partially along the length of the support 110, with tip portions 122 being aligned with a middle region (e.g., between portions 112 and 114) of support 110. In the inward configuration 121, the arms 120 may be twisted so that the tip portions 122 are aligned more tangentially with the outer surface 110S of the support 110 so as to lie against the support 110 when covered with the sheath 20 to provide a narrow cross-sectional profile.
The curved elbow portion 126 of each arm 120 may be configured to resiliently urge the arm 120 outward from the inward configuration 121 (
The plurality of arms 120 can be a unitary or integral part of the support 110 or, in another embodiment, the arms 120 can be welded, bonded, pinned, pivotably or slidably coupled by a hinge or sliding mechanism, or otherwise affixed to the support 110. In some embodiments, the arms 120 and support 110 are laser cut from a single tube of material such as stainless steel or cobalt chromium alloy. The arms 120 can then be formed into the desired unbiased configuration, optionally using heat to assist in forming or setting the ultimate shape.
In some arrangements, the plurality of arms have sufficient column strength and resistance to buckling to maintain the position of the support 110 relative to the native valve by engagement of the arms 120 with the annulus, as described more fully below. In the same or other arrangements, the arms 120 can have sufficient resilience to self-expand from the inward configuration 121 when unconstrained, and have sufficient flexibility to be deflected and repositioned when encountering rigid tissue structures during deployment.
The loading of the plurality of arms 120 will depend on the size of the native valve and the subject's blood pressure. As shown in Table 1 below, for a valve 25 mm in diameter, the force of blood pressure during systole can exert a load of about 1.8-3.1 lbf (about 7.8N-13.7 N) on the support 110. For a valve 29 mm in diameter, the systolic load on the support may be about 2.4-4.2 lbf (10.6N-18.5N). This load is distributed across the features that are in contact with the anatomy. The load may be supported by the arms 120, and, in one embodiment, the load may be spread evenly among the arms 120, so that the load can be divided by the number of arms. For example, with an apparatus having 10 arms, each individual arm 120 may see a load of about 0.2-0.4 lbf (1.1N-1.9N). In these arrangements, the arms 120, when restrained by engagement with the annulus, have a column strength sufficient to withstand these forces without buckling. Some flexing or slight deformation may be acceptable in some embodiments, however, arms 120 generally are configured to maintain the position of the support 110 relative to the annulus while under this loading. In other arrangements, the load may not be spread evenly among the arms 120 such that the load is distributed to individual arms in an uneven or variable manner. In these arrangements, the arms 120 can be configured to withstand higher loads, e.g. for a 10-arm embodiment, each arm can be configured to withstand a load of at least about 0.5 lbf, or in another embodiment at least about 1 lbf, and in a further embodiment at least about 2 lbf, without buckling, fracturing or otherwise failing. In embodiments with fewer arms, higher loads can be encountered by each individual arm, while devices having more arms may have each arm 120 receiving lower loads.
The values of Table 1 are based on the following model aspects and values. The systolic pressure acts as the pressure gradient on the mitral valve even though there is some pressure in the left atrium, and the true pressure gradient is less than the peak systolic pressure. The systolic pressure is shown for ranges from about 120 mmHg (normal) to 210 mmHg (far above the 160 mmHg threshold for Stage 2 hypertension). The pressure gradient is applied to the valve area, so for a given pressure, the larger the valve area, the greater the load.
The arms 120 can be sized and positioned in many ways so as to have a combination of rigidity, flexibility, and resilience that is appropriate for deploying and anchoring a replacement heart valve. The arms 120 may comprise sufficient rigidity to brace against the subannular rim and to push against the leaflets and/or chordae (for mitral valve replacement devices) so as to maintain position of apparatus 100 with respect to the native valve. For example, assuming a hypertensive systolic pressure of 200 mm Hg (0.0266 N/mm2) acting as a pressure gradient on a 25 mm diameter valve, the load on the device can be about 13.1 N (2.94 lbf). Divided evenly across 10 arms, each arm will receive a load of 0.294 lbf. For a stainless steel arm, each arm may have a circular cross-section with a diameter of at least about 0.016 in (0.41 mm), a length of 0.787″ (20 mm), and may be angled at about 15-20° away from the skeleton body.
The material and geometry selected for the arms can be used to determine the necessary dimensions. For an arm made from 316 stainless steel having minimum ultimate tensile strength of about 75 ksi (per ASTM A240), a minimum arm diameter may be 0.016″, for example. Arms of different cross-sectional shapes can have a similar bending moment of inertia, and increasing the number of arms on a prosthetic heart valve device can allow for a decrease in individual arm cross-sections. In some embodiments, weaker, softer, more brittle, or more flexible materials may require larger cross-sectional dimensions and/or more rigid geometries.
Referring back to
The plurality of arms 120 may nest within recesses or holes (not shown) in the outer surface 110S of the support 110 to reduce an overall profile or to accommodate a support 110 having a larger cross-section.
Referring to
In various arrangements of the prosthetic heart valve device disclosed herein, the plurality of arms 120 may be sufficiently rigid so as to be pushed or pulled up along the ventricular wall; however, the arms 120 can also be provided with flexibility and resilience so that the arms 120 or tip portions 122 do not damage cardiac tissue or get snagged in recesses in the wall of the downstream heart chamber. The plurality of arms 120 may also have flexibility and resilience so as to be deflected out of the way if engaged by obstructions such as papillary muscles and chordae as the arms are moved into position and engage a subannular surface of the annulus. The arms 120 may also be flexible and resilient so as to absorb some of the cyclic loading experienced by an implanted apparatus 100, and to decrease irritation and puncture of anatomical structures following implantation.
During percutaneous delivery, the support 110 and the plurality of arms 120 may be held within catheter 20 in a compressed configuration, with an overall diameter of about 5-8 mm, for example, with the support in the delivery configuration 111 and the plurality of arms in the inward configuration 121 (shown in
In the relaxed and unbiased outward configuration 123, the plurality of arms 120 may extend radially outward from the support 110 at various angles (e.g., extension angles 135 and splay angles 126SA) and in a generally upstream direction providing a gap distance 130 between the arms 120 and the outer surface 110S of the support 110 (FIGS. 2A5, 2A9-2A11). In some embodiments, the arms 120 can be arranged at extension angles 135 within a range from about 5-40 degrees, or in other embodiments from about 10-30 degrees, relative to the outer surface 110S (or axis 110A) and while in the outward configuration 123 (shown in FIGS. 2A5 and 2A11).
Referring back to
As shown in
As described above, when the arms 120 are in the outward configuration 123 and the support 110 is in the unexpanded delivery configuration 111, the individual arms 120 each extend away from the surface 110S of the support 110 by the gap distance 130. The gap distance 130 may correspond to a radial distance extending between the outer surface 110S and the tip portion 122 of each arms 120, or alternatively, may correspond to another radial distance extending between the outer surface 110S and another position along the extension portion 127 of the arm 120.
Referring to
In one embodiment, the plurality of arms 120A and 120B may be arranged in two rows 128A and 128B, respectively, on opposing sides of the support 110. The gap distance 130 of each of the plurality of arms 120A, 120B may vary among individual arms. For example, arms 120 closest to the second midline 110M2 of the support can have a first gap distance 130 while arms furthest from the second midline 110M2 can have a second gap distance 130 greater than the first gap distance 130. In this embodiment, the gap distances 130 can be arranged such that the arms 120 and/or tip portions 122 can be aligned in generally straight or, in another embodiment, curvilinear rows 128. As described herein, rows 128 may comprise a generally straight line, a curved line, a zig-zag, sinusoidal shape, or other configuration. In some embodiments, the rows 128 are straight or form a slight curve with a radius of curvature substantially larger than that of the outer surface 110S. While a row 128 is shown, the gap distance 130 of each of the tip portions 122 may be varied in many ways to achieve a variety of different arrangements of arms 120 or tip portions 122 so as to position the tip portions 122 against the native annulus and/or to receive the leaflets of the treated valve (e.g., the mitral valve).
In additional arrangements, arms 120A on a first side 110S1 of support 110 may be different in number, may be in a different arrangement, may be disposed at different angles (e.g., extension angles 135 or splay angles 126SA) in the outward configuration 123, may have different sizes or shapes, may be more or less flexible, or may have other properties different than the arms 120B on a second side 110S2 of the support 110. This enables the arms 120 in each row 128A or 128B, or other groupings of the arms 120, to be tailored to receive a particular leaflet of the native valve and/or accommodate the unique physiology of particular leaflet and surrounding anatomy. For a particular valve, such as the mitral valve, in which the two leaflets are very different in shape and size, and where the surrounding anatomy is very different around the anterior leaflet than around the posterior leaflet, this variability and independent adaptability of the arms 120A, 120B on different and/or opposing sides of the support 110 can be useful for providing unique and custom fits of the devices/apparatuses to target native valve structures in a variety of patients and in a variety of unique disease states. In particular, in the case of the mitral valve, the anterior leaflet is disposed adjacent to the left ventricular outflow tract (LVOT) for which, in some embodiments, obstruction should be avoided. Further, the wall of the left ventricle is farther away from the anterior leaflet than a corresponding distance to the ventricle wall near the posterior leaflet. As such, arms 120A, for example, configured to capture and engage the anterior leaflet may not be able slide along a wall of the ventricle to guide the arms to the subannular surface. Thus, in some embodiments, arms 120A on the first side 110S1 of support 110 can be configured, in the outward configuration 123, to extend from the support 110 at a shallower angle and/or to have a shorter gap distance 130 than the arms 120B on the second side 110S2 of the support 110 (shown in FIG. 2C1). In this way, the arms 120A on the first side 110S1 can be positioned to capture the anterior leaflet while minimizing obstruction of the left ventricular outflow tract, and the more widely separated arms 120B on the second side 110S2 can more easily capture the posterior leaflet while being guided toward the annulus by engagement with the left ventricular wall.
The first plurality of arms 120A and the second plurality of arms 120B can be arranged in many ways to receive the corresponding first or second leaflets. The first plurality of arms 120A and the second plurality of arms 120B may comprise similar components oriented around the longitudinal axis 110A so as to define one or more planes of symmetry. For example, the first plurality of arms 120A can extend from a first side of the support 110S1 and the second plurality of arms 120B can extend from a second side of the support S2, wherein a midline 110M divides the support 110 between side 110S1 and side 110S2. A second midline 110M2 perpendicular to midline 110M can further divide each of the first side and the second side. In some embodiments, the gap distance 130 associated with each individual arm 120 can increase progressively with respect to distance from the second midline 110M2. With aortic or other tri-leaflet valve embodiments, the first plurality of arms 120A may extend from a first portion of the support 110, the second plurality of arms 120B may extend from a second portion of the support 110, and a third plurality of arms (not shown) may extend from a third portion of the support 110, forming three rows in a generally triangular shape such that each of the plurality of arms 120 extending from the corresponding portions of the support 110 can be aligned with one of the native valve leaflets.
As described above, the plurality of arms 120 in each row 128 can be splayed away from each other arm 120. The plurality of arms 120 can extend from the base portions 124 to the tip portions 122 at different splay angles (e.g., 126SA1 and 126SA2 shown in FIG. 2A9) so that a distance between adjacent tip portions 122 is greater than a distance between adjacent base portions 124. For example, the arms 120 further from the second midline 110M2 (such as arm 120x shown in FIG. 2A10) can have a greater splay angle relative to the axis 110A, than those arms 120 closer to the second midline (such as arm 120z shown in FIG. 2A10). The plurality of arms 120 in each row 128 might alternatively be biased toward the second midline 110M2 so as to be grouped more tightly together. In this embodiment, the distance between adjacent tip portions 122 is less than a distance between adjacent base portions 124. This arrangement may facilitate the placement of the group of arms 120 through a gap in the chordae near the center of a native mitral valve leaflet.
The plurality of arms 120 can be configured to deflect laterally in response to tissue resistance. For example, each the plurality of arms 120 can be configured to deflect in response to contact with one or more of the chordae tendineae, such that the arm 120 can deflect away the chordae tendineae to avoid entanglement and decrease distortion to the leaflets as the arms 120 are advanced toward the annulus. For example, the elbow portion 126 of each arm 120 can be configured to allow deflection of the tip portion 122, while the extension portion 127 can provide suitable column strength to the arm 120. Accordingly, the elbow portion 126 may comprise a flexible material having a sufficient resiliency so as to assist transition of the arm 120 between the inward configuration 121 and the outward configuration 123, and so as to deflect in response to contact with the chordae or other heart tissue. In some embodiments, the arm 120 may comprise materials similar to the skeleton of the support 110, while the cross-sectional size and curvature of the elbow portion 126 can be configured to provide resilient deflection of tip portions 122 without substantial deformation of the shape and positioning of the elbow portion 126.
In accordance with some embodiments of the present technology, the tip portion 122 of the plurality of arms 120 can be configured to avoid trauma to and inhibit penetration of the annulus or other heart tissues. The tip portion 122 may comprise a surface or material to atraumatically contact and/or engage the annulus while avoiding penetration of the annulus tissue. In some embodiments, the tip portion 122 of each of the plurality of arms 120 may comprise a pressure reducing tip portion 122PR. The pressure reducing tip portion 122PR may comprise any of various structures configured to distribute force over a wider area of contact and avoid penetration of the tissue. Such structures can include, for example, a bumper, broadened foot, disk, curved tip, loop, tube, cap, eyelet, mitten, sleeve, sheath, ball, golf club head-shaped, teardrop shaped structure or other such structures known in the art configured to atraumatically apply pressure to tissue while avoiding penetration or trauma to the tissue. In the embodiment shown in
While in some embodiments, it generally can be desirable to avoid trauma and penetration of the native annulus, in some embodiments the tip portions 122 may be configured to penetrate the annulus partially or entirely in order to more securely anchor the apparatus 100 to the native valve. In such embodiments, tip portions 122 may include sharpened distal tips to enable penetration, and/or barbs, hooks or other suitable structures to resist removal from the tissue after penetration. In addition, the tip portions 122 may further include a depth limiting structure such as a hilt or flange extending around the arm 120 spaced a desired distance from the tip portion 122 to limit the depth of penetration into the annulus. In some embodiments (not shown), the sharpened distal tips may be retractable within the extension portions 127 of the arms 120 such that the penetrating portions (not shown) can be in a retracted state while the apparatus 100 is being positioned with the native valve region and can be in an extended state when contact is made with the desired target region of the subannular surface, for example. In this manner, the sharpened tip portion and/or penetrating tip portions can avoid trauma, cutting, or scraping of any other heart tissue during deployment.
In further embodiments, the extension portion 127 and/or the tip portion 122 of each of the plurality of arms 120 may comprise one or more of an anchoring structure, barb, bump, ridge, scale, sintering, a roughened surface, polymeric or fabric coverings, or hooks on their upstream and/or inward-facing surfaces configured to enhance friction with or couple to the annulus, back sides of the native leaflets, chordae, heart wall, or other surrounding structures to inhibit movement of the apparatus 100 once implanted.
Referring to FIG. 2C2, each of the plurality of arms 120 can optionally include a length adjusting mechanism 136 to adjust a length of the arms and/or the height 138 of tip portions 122 relative to support 110 and/or elbow portion 126 in response to contact with the annulus. In some embodiments, the length adjusting mechanism can be self-adjusting, and in other embodiments, the mechanism can be manually or operatively adjustable. In a further embodiment, the mechanism 136 may be configured to lock each of the arms 120 into position with a desired degree of axial rigidity when the arm 120 engages the annulus at the desired height 138. In some embodiments, the height 138 of each of the tip portions 122 may correspond to a distance along the axis 110A between the tip portion 122 and the base portion 124. In some embodiments, the mechanism 136 may comprise one or more of a spring, a slider, a hypo tube, a telescopic joint or a deflectable portion of the plurality of arms. One of ordinary skill will recognize other mechanisms 136 suitable for self adjustment or manual adjustment of arm length.
In some arrangements, the plurality of self-adjusting arms 120 can be well suited for use with devices used to implant at the native mitral valve region, as the mitral valve may have a non-uniform geometry that can vary among patients. In one embodiment, the mechanism 136 may comprise a telescopic configuration for adjusting and locking each arm 120. In one example, the tip portions 122, which may include a bumper or enlarged surface, may be coupled to a hypodermic tube 136T which can slide up and down over an extension portion 127 of the arm 120. An internal compression spring 136S may bias the tube 136T in an upstream direction so tip portions 122 are urged toward the annulus. The springs 136S may be further compressible from this position in response to tissue contact. When the support 110 is moved in an upstream direction with the plurality of arms 120 extending behind the leaflets, the arms 120 which contact the lower portions of the annulus first can start to compress, so as to allow additional arms 120 to contact the higher portions of the annulus. In exemplary embodiments, the height 138 of tip portions 122 will be self-adjusting within a range of about 1-15 mm to maintain engagement with the higher and lower portions of the annulus.
The self-adjusting the length of the arms 120, for example due to the internal springs 136S, can be expected to last a few hours after implantation. After that time, blood in the space between the hypo tube 136T and the strut over which it slides may cause the mechanism 136 to seize up or otherwise prevent further movement, thereby locking the mechanism 136 and providing a stable or static length of the arm 136. In the locked configuration, the plurality of arms 120 can support the hemodynamic load applied to the apparatus 100 with each second heart chamber contraction (e.g., heartbeat). It is also understood that the mechanism 136 to adjust and lock each arm 120 can be formed in additional ways, including, for example with telescoping tubes fitted with friction locks, spring buttons, cam locks, ratchet system, or hydraulic pressure resistance.
When the apparatus 100 has been positioned in the left ventricle with the arms 120 released in the outward configuration as shown in
The plurality of arms 120 may comprise a first outward configuration 123A prior to expansion of the balloon (not shown) and a second outward configuration 123B after expansion of the support 110 with the balloon and as illustrated in FIGS. 2C3 and 2C4, respectively. Referring to FIG. 2C3 and in the first outward configuration 123A, each of the plurality of arms 120 are separated from the outer surface 110S of support 110 by a gap distance 130A, and each of the tip portions 122 are separated from the outer surface 110S by a gap distance 132A. The arcuate or elbow portion 126 extends below the downstream portion 114 of the support 110 so as to engage the balloon, if present, with the cam portion 126C, as described above. When the support 110 expands from the delivery configuration 111 to the expanded configuration 113, the balloon can engage the cam portion 126C urging the plurality of arms to transition from the first outward configuration 123A to the second outward configuration 123B. The cam portion 126C can move radially outward away from the longitudinal axis 110A of the support such that the cam portion 126, in some embodiments, is outside of a vertical alignment with the support 110. As the cam portion 126 moves radially outward with pressure from a balloon or other expansion device, the axis 126AA (FIG. 2C3) is moved outward to axis position 126AB (FIG. 2C4) and the extension portion 127 and the tip portion 122 are both urged closer toward the outer surface 110S. The gap distance 130B between the arms 120 and the outer surface 110S is decreased in the second outward configuration 123B as compared to the first outward configuration 123A, and the gap distance 132B between the pressure reducing tip portion 122PR and the outer surface 110S is similarly decreased in the second outward configuration 123B. As the arms 120 transition from the first outward configuration 123A to the second outward configuration 123B, the arms 120 can engage and trap the leaflet against the outer surface. In some embodiments, the plurality of arms 120 can include a shape memory material which can promote similar movement between the configurations 123A and 123B.
In addition to the inward movement of the arms 120 relative to the outer surface 110S, the plurality of arms 120 can have a twisting action when transitioning from the first outward configuration 123A to the second outward configuration 123B, as shown schematically in FIGS. 2C5 and 2C6, respectively. In the first outward configuration 123A as seen from the downstream direction shown in FIG. 2C5, the cam portion 126C of each of the plurality of arms 120 extends inclined at an angle away from the axis 110A. When a delivery balloon expands (not shown), the cam portion 126C engages the balloon and twists the arm 120 about base portion 124 and moves the tip portion 122 toward the outer surface 110S with twisting movement 123T. The twisting can splay the arms 120 when the support 110 expands (FIG. 2C6). The twisting of arm 120 about the base portion 124 allows the arm 120 to be drawn toward the annulus (not shown) from a location along the leaflet having few chordae (FIG. 2C5) to a position that engages the annulus and extends along the leaflet to locations having a higher density of chordae (FIG. 2C6). The plurality of arms 120 can be configured to move similarly with shape memory material, for example.
In some embodiments, the arms 120 are configured to move inwardly toward the surface 110S as the support 110 is expanded so as to more accurately engage the annulus A and/or more firmly engage the leaflets L. Referring back to
As shown in
In some embodiments, the apparatus 100 may comprise a membrane or sealing members 160 extending radially outward from the outer surface 110S of the support 110 to inhibit blood flow between the support 110 and the native leaflets. For example, the sealing members may extend outward from the support 110 so as to extend along the long dimension of the mitral valve into the native commissural regions 170, as shown in
Thus, when the sealing members 160 are deployed, they can extend over the native commissural regions 170 and can inhibit or prevent the flow of blood through the native commissural regions 170 in either the upstream or down stream directions.
FIGS. 2F1-A and 2F1-B are side and top views, respectively, of a prosthetic heart valve device (e.g., apparatus 100) having sealing members 160 configured to be positioned adjacent the commissures of the native valve. In some embodiments of the apparatus 100 suitable for mitral valve replacement, a pair of sealing members 160A, 160B may be coupled to opposing sides of the support 110, e.g., roughly 90 degrees offset from the locations of rows 128A, 128B of arms 120, and so as to be positionable in the commissures of the native valve. Sealing members 160A, 160B may comprise tent-like conical or pyramidal tubes of a membrane or fabric such as Dacron or PTFE, tapering from an open downstream end 161 to a closed, narrow upstream end 162. The outer surface 110S of the support 110 (or alternatively, an inner surface of the support 110) may be covered with an impermeable fabric to prevent blood flowing from within the sealing members into the interior of the support 110. Wires may be sewn into sleeves along the edges and along the longitudinal peaks of the sealing members 160A, 160B to maintain their shape and conformity. The sealing members 160A, 160B are configured to fit adjacent or within commissures between the posterior and anterior leaflets, to effectively seal the outer surfaces of the sealing members 160A, 160B to the native valve tissue. During systole, blood is pushed under pressure though the open downstream end 161 of the sealing members 160A, 160B thereby inflating the sealing member 160A, 160B and urging it against the native leaflets and enhancing the seal. Optionally, openings (not shown) may be provided between the interior of the sealing members 160A, 160B and the interior of the support 110, allowing blood to flow from within the support 110 into the interior of the sealing members 160A, 160B to further pressurize them.
In addition to the commissures, gaps may be present between the leaflets and support 110 in other areas around the circumference of the support 110 and through which perivalvular leaks may occur. A sealing member 160 or other similar membrane feature can be included to extend around most or the entire circumference of the support 110 so as to seal any such gaps. In one embodiment, shown in FIGS. 2F2-A and 2F2-B, a bell-shaped skirt 163, tapering from an open downstream end 164 to a closed, narrower upstream end 165 can be provided on the apparatus 100. The skirt 163 may be integrally formed with or sewn to a cover 166 (such as cover 151 discussed above with respect to
In alternative embodiments, the skirt 163 may extend only part-way down the length of the support 110 from the upstream end 112a, as shown in FIG. 2F3-A. In another arrangement, shown in FIG. 2F3-B, the skirt 163 can be attached to the support 110 at the upstream end 112a and configured to flare upwardly in an upstream direction (e.g., have an open skirt end facing upstream). In further embodiments, the skirt 163 may attach to and extend from the downstream end 114a of the support 110, flaring and opening either in a downstream direction as shown in FIG. 2F4-A, or flaring and opening in an upstream direction as shown in FIG. 2F4-B. In another embodiment, the skirt 163 may flare in the upstream direction while extending around the outside of arms 120, as shown in FIG. 2F4-C. The skirt 163 may alternatively be mounted to the support 110 in a mid portion, between the upstream and downstream ends 112a, 114a. In further embodiments, the skirt 163 may also extend around only a subsection of the perimeter of the support 110.
In a further embodiment, shown in FIGS. 2F5A-2F5D, one or more leaflet pushers 300 can be coupled to the support 110 and configured to extend in the upstream direction to engage the leaflets and urge them into coaptation with each other or into sealing engagement with the outer surface 110S of the support 110. The leaflet pushers 300 may be constructed similarly to arms 120 but because they need not serve the function of pushing against or pressing into the annulus to anchor the device 100, leaflet pushers 300 may, in some embodiments, have less rigidity and strength as arms 120. Further, in select embodiments, leaflet pushers 300 can have further lateral extension when compared with arms 120 to enable the pushers 300 to engage the leaflets near the valve commissures, (e.g., where the leaflets are not in engagement with the support 110 and may be prevented from coapting). As shown in FIGS. 2F5A-2F5D and described further below, the leaflet pushers 300 can push in opposing directions so as to urge the leaflets toward each other.
As shown in FIGS. 2F5A-2F5D, leaflet pushers 300 extend from a downstream end 114a of support 110. A pair of leaflet pushers 300 can be provided and coupled on each of two opposing sides of the support 110 which can be approximately 90 degrees offset from the two opposing sets of arms 120, such that each pair of leaflet pushers 300 are positioned to extend toward the commissural regions 170 of the valve. In one embodiment, each pair of leaflet pushers 300 can be arranged in a crossing pattern along the outer surface 110S of the support such that the distal tips 302 are on opposite sides from the bases 304 (shown in FIGS. 2F5B and 2F5D). When the support 110 is in the radially-contracted delivery configuration 111, distal tips 302 are separated from each other as shown in FIGS. 2F5A-2F5B. In this configuration, leaflet pushers 300 can be positioned behind the leaflets L such that the distal tips 302 engage the ventricular or downstream side of the leaflets outside of the support 110. When the support 110 is expanded to its expanded configuration 113, distal tips 302 are urged toward one another, pushing the leaflets L toward each other into sealed coaptation, as shown in FIGS. 2F5C-2F5D. Alternatively or additionally, leaflet pushers 300 may be configured to push leaflets L toward the support 110 so as to seal against the outer surface 110S of the support 110.
For mitral valve treatment, during expansion of the support 110 into the expanded configuration 113, one row of the arms 120 can be configured for placement behind the anterior leaflet and to contact the annulus without extending excessively or obstructively into the left ventricular outflow tract. The other row of arms 120 can be configured for positioning behind the posterior leaflet and may contact regions of the ventricular wall, while engaging the posterior annulus with the tip portions 122. The more laterally positioned arms 120—those further away from the midline 110M2 in each row—may remain some millimeters away from the outer surface 110S of the support 110 when the support has been expanded, so that the tip portions 122 can make contact with the annulus even though the expanded support 110 does not fill the entire area of the native mitral valve near the commissures 170. These more laterally positioned arms 120 may also engage the leaflets and urge them against the support 110 and in closer apposition to each other to help prevent retrograde blood flow through the commissures 170.
In some arrangements, this approach may tend to push some or all of the central chordae CT laterally. Accordingly it may be desirable in some embodiments to make the arms 120 a little longer, so that the arms 120 extend in the downstream direction further into the left ventricle (e.g., increase the distance 138 shown in FIG. 2A1) and so that the chordae CT and leaflets are more minimally displaced. The leaflets can be compressed by the arms 120 an amount sufficient so as to provide support, keep the leaflets out of the way of the prosthetic valve 100, and to limit systolic anterior motion.
Referring again to FIG. 2A1, the skeleton 140 of the support 110 may comprise a plurality of nodes 110N which move apart from one another when the skeleton 140 is expanded. The base portions 124 of the arms 120 can be coupled to the plurality of nodes 110N such that the plurality of arms 120 separate from one another when the support 110 expands from the delivery configuration 111 to the expanded configuration 113. The plurality of bases 124 can be coupled to the plurality of nodes 110N, for example, such that the plurality of base portions 124 separates with respect to each other when the support 110 expands. The arms 120 and tip portions 122 may also splay outwardly—i.e. the splay angle 127SA of the arms 120 relative to the longitudinal axis 110A may increase—when the support 110 expands from the delivery configuration 111 to the expanded configuration 113. Each of the plurality of base portions 124 may be integrally formed with the nodes 110N or can be connected to the plurality of nodes 110N in other ways, for example, by welding, bonding, mechanical fastener, slider, tube, and many attachment and other coupling mechanisms known in the art so as to transmit forces from the tip portions 122 to the skeleton 140 of the support 110.
In some configurations, due to their angle relative to the support 110, arms 120 may translate forces downward and radially inward against the support 110 at the location (e.g., base portion 124) where the arms 120 are coupled to the support 110. This force may be at a maximum force when a valve (e.g., valve 150) mounted to the support 110 closes and the force of blood pressure downstream of the valve 150 pushes the support 110 in the upstream direction and arms 120 engage the annulus. Accordingly, the support 110 may have a hoop strength sufficient to resist inward radial deformation at the point where the arms 120 are coupled to the support 110.
In one embodiment, the support 110 may include a retention structure to inhibit migration of apparatus 100 in the downstream direction. In embodiments suitable for mitral valve replacement, the retention structure may be coupled to support 110 on or near its upstream end 112a so as to be located in the left atrium and upstream of the native annulus.
In another embodiment, as shown in
The embodiments described herein can also be adapted for trans-apical delivery via ventricular incision or puncture, or retrograde delivery via the aorta. In trans-apical and aortic delivery, due to the approach coming from the downstream side of the valve rather than the upstream side, the upstream portion 112 and the downstream portion 114 of the apparatus will be reversed on the delivery system, and the delivery system can be modified appropriately.
Because the apparatus 100 utilizes the plurality of arms 120 to engage the annulus for maintaining the position of the apparatus 100 rather than outward compression against the aortic wall, the support 110 can be expanded to a diameter slightly smaller than the inner diameter of the aorta. This slightly undersized expanded configuration 113 may protect against unintentional blockage of the coronary ostia. Further, the present technology may provide more consistent and complete deployment of the apparatus 100 than prior transcatheter aortic valves that rely on aggressive expansion against the aortic wall and/or annulus. Prior transcatheter aortic valves may deploy to a non-circular, uneven shape because of calcium nodules in the native valve leaflets. In contrast, the apparatus 100 of the present technology can be deployed consistently into a known shape and size in which it will reliably function. This improved coupling to the annulus can help to prevent perivalvular leakage as well as incompetent valve closure due to incomplete valve expansion. Further, the plurality of arms 120 can hold the native aortic leaflets against the support 110, helping to decrease perivalvular leakage and regurgitation. The improved coupling to the annulus with the arms 120 and the support 110, as described herein, may also reduce the incidence of embolic debris and stroke, which can be a particular concern with transcatheter aortic valve replacement.
Devices suitable for aortic deployment may further include a flange 165 or plurality of fingers 165PF on the upstream end 112a of the support 110 (similar to those shown in
Additionally, devices suitable for aortic valve replacement may be implanted using either a retrograde approach via the aorta, a trans-septal approach from the right atrium, or transapical approach via a puncture or incision in the left ventricle. In retrograde approaches, because the native valve will be approached from the downstream side rather than the upstream side, the apparatus 100 will be oriented in a reverse direction on the delivery system from the trans-septal mitral embodiments described above. Further, the delivery system can be modified appropriately for this reverse orientation. In apical approaches, the device will be oriented similarly to trans-septal mitral embodiments, although because of the shorter length and surgical approach, other suitable modifications may be made to the delivery system.
Referring to
With expansion of the support 110 from the delivery configuration 111 to the expanded configuration 113, the struts 142 can assume an elongate configuration so as to increase the separation distance of the posts 144 and corresponding nodes 110N. The distance between the ends of the struts 142 can be increased with deformation of the struts 142 with force of a balloon (not shown), or the struts 142 may comprise a shape memory material, for example. The skeleton 140 may also comprise a variety of eyelets, hooks, or other features to facilitate attachment of the valve, membrane, sealing member, skirt, cover, or other elements.
The plurality of tips 122 can be curved such that each tip comprises a curved portion 122C. The curved portion 122C of each of the plurality of tips 122 can be curved around an axis 122CA. The curved portion 122C can extend from the extension portion 127 pointing inwardly toward the surface 110S of the support 110, and the axis 122CA of each curved portion may be parallel to a tangent of the outer surface of support 110, or, alternatively, parallel to the midline 110M1, for example. In the embodiment shown, the axis 122CA of each curved portion 122C are generally parallel to each other and parallel to midline 110M1.
The plurality of arms 120 are attached to the downstream ends of posts 144 and have a curved elbow portion 126 extending a distance 139 below the downstream end portion 114 of the support 110. Each curved elbow portion 126 can be curved about an axis 126A which, like axis 122CA, is parallel to midline 110M1. Alternatively, axis 126A may be parallel to a tangent of the outer surface of support 110, or disposed at some other angle. Intermediate elbow portions 126 may comprise a cam portion 126C to engage the balloon (not shown). The curved elbow portion 126 may comprise U-shaped portion 126U. The curved elbow portion 126 can extend to the extension portion 127, and the extension portion 127 can extend from the curve elbow portion 126 to the tip portion 122.
Operatively, when the pressure reducing tip portions 122PR engage annulus tissue, the arms 120 can slide axially in the downstream direction relative to support 110 to accommodate the varying elevations of the annulus and to ensure that all of the arms 120 contact the annulus. The pressure reducing tip portions 122PR of the arms 120 may also be configured to deflect when contacting annulus tissue to avoid trauma and to allow further variation of the height of the pressure reducing tip portions 122PR. Preferably arms 120 are slidably coupled to the support 110 in such a way that their axial position is maintained once the support 110 is positioned in the desired final location. For example, the coupling mechanism may apply significant friction to the arms 120 such that a fairly high threshold axial force must be applied to the arms 120 to overcome such friction. For example, the threshold force could be of sufficient magnitude that the user could apply it via the delivery system, but could be higher than the forces applied to the arms 120 once implanted. Alternatively, the arms 120 may have teeth, bumps, notches, detents, or other mechanical indexing features that engage a cooperating structure coupled to the support, providing a series of axial positions at which the arm 120 can be maintained.
FIGS. 5A1-5A4 are side views of a prosthetic heart valve (such as apparatus 100) having arms 120 with ringed tips 122 configured in accordance with another embodiment of the present technology. The apparatus 100 is shown having a plurality of arms 120 with pressure reducing tip portions 122PR comprising rings or loops wherein each ring 122 can lie in a vertical plane extending radially from the central longitudinal axis 110A of the support 110, or which is parallel to a tangent of the outer surface 110S of the support 110. In such an arrangement, the tangential orientation of the ring 122 may improve the ease of compressing the arms 120 to form a compact delivery profile. In other embodiments, the ring 122 can be at various other angles relative to the support 110. The support 110 in the delivery configuration 111 may comprise a cross-sectional diameter 111D defined by a first outer boundary 111B1 and a second outer boundary 111B2. The curved portion 126 of the arms 120 may have one or more bends 126B1, 126B2, 126B3 so as to offset the axis 126A (FIG. 5A4) to within the outer boundaries 111B1 and 111B2 of the profile of the support 110.
FIGS. 5A5-5A6A show a further embodiment of a prosthetic heart valve device (apparatus 100), having arms 120 with a first, flattened cross-sectional dimension and a second, elongated cross-sectional dimension such that the arms 120 have a relative resistance to bending in different directions. FIG. 5A6B shows a portion of the arm 120 along line A-A of FIG. 5A5. For example, curved portions 126 of the arms 120 can have a cross-sectional shape 126CSA, as shown in FIG. 5A6A. The cross-sectional shape 126CSA is flattened and wider along a distance 126CSC in the circumferential direction (parallel to a tangent of the outer surface 110S of support 110) and relatively thin along a distance 126CSR in the radial direction. Accordingly, the cross-sectional distance 26CSC extending circumferentially and parallel to the support 110 is greater than the cross-sectional distance 126CSR extending radially. This arrangement can give the arms 120 a lower bending stiffness toward and away from the support 110, but a relatively high bending stiffness in a circumferential direction. Various other cross-sectional dimensions and geometries may be selected to provide a desirable relative bending stiffness in any direction.
FIG. 5A6B shows a portion of the arm along line B-B of FIG. 5A5. As illustrated, the extension portion 127 of each arm 120 can have a different cross-sectional shape than the curved elbow portion 126 of the arm 120 (FIG. 5A6A). For example, while the cross sectional shape 127CSA is flattened and wider along a distance 127CSC in the circumferential direction (parallel to a tangent of the outer surface 110S of support 110) and relatively thin along a distance 127CSR in the radial direction (similar to the cross-sectional shape 126CSA), the radial dimension along distance 127CSR can be larger than the radial dimension along distance 126CSR in the curved elbow portion 126 in order to resist buckling of the extension portions 1127. The flattened and wider dimension 27CSC can provide a wider surface for engagement of the native leaflets.
In other embodiments, the curved elbow portion 126 may have a radial dimension 126CSR that is the same or greater than that of the extension portion 127 so as to have greater resistance to bending. Further, either the curved elbow portion 126 or the extension portion 127 may have a cross-section in which the circumferential dimension is closer to or about the same as the radial dimension, giving it more rigidity and resistance to bending away from the support 110. In one embodiment, the curved elbow portion 126 may have a cross-sectional shape 126CSA which is circular, while the extension portion 127 has a cross-sectional shape 127CSC that has polygonal geometry, e.g. rectangular, trapezoidal, triangular or other shape.
FIGS. 5A7-5A8 are side and front views, respectively, of prosthetic heart valve devices (apparatus 100) with arms 120 including arm tips having a pressure reducing bent tip portion 122 PR for providing a planar subannular interfacing tip. As shown, arm tips portions 122 have an approximately 90° bend 122C1 about a horizontal axis so that the loops of the pressure reducing tip portions 122PR lie in a plane generally parallel to the subannular plane of the native valve. In some embodiments, the pressure reducing tip portions 122PR may be bent outwardly away from the support 110 as shown in FIG. 5A7, inwardly toward the support 110 as shown in FIG. 5A8, or laterally in a circumferential direction (not shown).
FIGS. 5A9-5A10 are partial side views of a prosthetic heart valve device (apparatus 100) having an arm 120 with loop 510 and two support attachment points on a support 110. As shown, the arms 120 can comprise a loop 510 such as a wire loop with both ends of loop 510 coupled to support 110 to provide a pressure reducing tip 122PR at a distal end of the loop 510. The distal looped end of the loop 510 may be formed in various configurations, with the loop lying in a vertical plane as shown in FIG. 5A9, in a horizontal plane, or in various other configurations. A plurality of such loops 510 may be coupled to the support 110 in various arrangements as described elsewhere herein. In some embodiments and as shown in FIG. 5A10, in order to reduce a cross-sectional profile during delivery, wire loops 510 may be configured to wrap helically around of the exterior of the support skeleton 140 in an inward configuration 121 of the arm 120.
As described above, the support 110 and arms 120 can be covered partially or entirely with a coating or covering which promotes tissue in-growth and provides additional sealing within and around the device. In some embodiments, the arms 110 and the support 110 can be covered by or contained within a fabric cover of Dacron™, ePTFE, or other suitable material. Various arrangements of suitable covers are illustrated in FIGS. 5A11-5A15. In some embodiments, more than one arm 120 (e.g., a plurality of arms 120) may be contained together within a single cover member as described below. For example, in the embodiment shown in FIG. 5A11, a first plurality of arms 120 on a first side 110S1 of the support 110 can be contained within a first cover member 320, while a second plurality of arms 120 on a second side 110S2 of the support 110 can be contained within a second cover member 322. Cover members 320, 322 may comprise a single sheet or wall of material extending across and adhered to one surface of the arms 120, or they may be sewn or otherwise made into a hollow sock or mitten which fits over the arms 120 and completely surrounds them. Cover members 320, 322 may be integrally formed with or attached to a tubular cover or sleeve 324 which extends around the exterior and/or interior of support 110. Cover members 320, 322 may each contain all of the arms 120 on the respective sides of support 110, or only a selected portion of the arms 120.
In another embodiment, shown in FIG. 5Al2, two or more arms 120 can each be covered by a separate cover member 326, however, the cover members 326 are interconnected at the distal ends of arms 120 by an interconnecting portion 328. The cover members 326 may form a continuous tubular member extending over the two or more arms 120, or, in another embodiment, separate tubular members 326 may cover each arm 120 and an interconnecting piece may be attached to the distal end of each tubular member. In some embodiments, the interconnection of two or more arms 120 by the cover member 326 and portion 328 may distribute forces more broadly across the valve annulus as well as reducing trauma to the annulus tissue.
In yet another embodiment, shown in FIG. 5A13, each arm can be covered by a separate tubular cover member 330. As described with respect to FIG. 5A11, each cover member 330 may be integrally formed with or coupled to a tubular sleeve 332 configured to cover the support 110. A distal cap 334 of each cover member 330 may conform to the shape of the underlying arm 120 and tip portion 122. Alternatively, the distal cap 334 may have a configuration which distributes force, reduces pressure, and/or reduces the trauma exerted by engagement of the arm 120 on the annulus. For example, as shown in FIG. 5A14, the distal cap 334 may comprise a generally spherical projection 336 substantially larger than the area of tip portion 122. Projection 336 may be soft and padded so as to minimize trauma to the annulus tissue, and made of a material which enhances friction against the annulus to minimize movement of the arm 120 against the tissue. Further, each cover member 330 may be movable longitudinally relative to the underlying arm 120 to allow for self-adjustment of position of the projection 336, thus accommodating for varying elevation of the valve annulus. For example projection 336 may have an inner pocket 339 for receiving the arm 120 and/or tip portion 122 which, prior to deployment of the device, extends toward a distal tip 338 further than does arm 120, leaving some vacant room distally of the tip portion 122. When projection 336 is brought into engagement with the annulus, it may be pushed downward relative to the arm 120 due to the flexibility and compressibility of the cover member 330 and/or projection 336, thereby acting as a shock absorber and ensuring engagement of each distal tip 338 with the annulus despite variations in the elevation of the subannular surface.
In a further embodiment, shown in FIG. 5A15, the tip portion 122 of arm 120 is covered by a cover member 340. Cover member 340 may comprise a fabric sock-like covering having a teardrop shape and adapted to surround and adhere to a distal portion of the arm 120 (including the tip portion 122). Alternatively, the tip portion 122 may itself be formed in a teardrop shape, and a separate cover member 340 may be correspondingly shaped so as fit over the tip portion 122. The cover member 340 may cover only the teardrop-shaped end of the arm 120, or may cover a larger portion of the arm 120, or in some embodiments, cover the entire arm 120.
FIGS. 6A1 to 6B4 are bottom, front, side and isometric views of prosthetic heart valve devices (apparatus 100) showing arms 120 that cross from a support attachment site on a first side 110S1 of a support 110 to a leaflet and/or annulus engaging site oriented on a second side 110S2 of the support 110 opposite the first side 110S1. In one embodiment, each of the plurality of arms 120 comprises a curved elbow portion 126 configured to span across a downstream portion 114 the support 110 and extend from the first side 110S1 to the second side 110S2. Accordingly, the base portion 124 of arm 120 can be coupled to a different side (e.g., side 110S1) of the support 110 than that on which the tip portion 122 is positioned (e.g., side 110S2). The arms 120 may be constructed like any of the various other embodiments described herein, including single wires or ribbons with looped tips as shown as in FIGS. 6A1-6A4, or in complete loops as shown in FIGS. 6B1-6B4. Upon expansion of the support 110, the arms 120 pull the native leaflets toward each other and/or toward the outer surface 110S of the support 110, thereby enhancing the sealing of the leaflets against the support 110 to prevent perivalvular leaks.
FIG. 7A1 shows a prosthetic valve 180 in an expanded configuration for use with the support 110. The prosthetic valve 180 may comprise a commercially available valve, such as, for example, the Sapien™ transcatheter heart valve from Edwards Lifesciences LLC or the CoreValve™ transcatheter heart valve from Medtronic, Inc. The prosthetic valve 180 may comprise an expandable stent-like frame 184 having a compact configuration positionable within the expanded support 110. The frame 184 can be expanded from the compact configuration to a second expanded configuration so as to attach the prosthetic valve 180 to the support 110. The frame 184 may be either balloon-expandable, as in the case of the Sapien valve, or self-expanding, as in the CoreValve valve.
Referring back to
In various embodiments, the expandable support 110 will be configured to resist expansion beyond a predetermined diameter even under the expansion force of a balloon (not shown) used to expand the prosthetic valve 180. Following expansion of the prosthetic valve 180 within the support 110, especially where the prosthetic valve 180 is balloon expandable, some recoil (radial contraction) of both the frame 184 of the prosthetic valve 180 and the support 110 may occur. The support 110 may therefore be configured to recoil an amount greater than the recoil of the prosthetic valve 180 so that an adequate radial force is maintained between the two structures. The expandable support 110 may comprise skeleton 140 which exerts a radially inwardly directed recoil force against the expandable frame 184 of valve 180, and the expandable frame 184 may comprise a stent which presses radially outward against the skeleton 140. The expandable skeleton 140 can move radially outward with the stent-like expandable frame 184 when a balloon 190 is placed within a lumen of the expandable frame 184 and inflated. When the balloon is deflated, to the extent either the skeleton 140 or the expandable frame 184 experience inward recoil, the skeleton 140 will be adapted to recoil more than the frame 184. The skeleton 140 may comprise one or more of a first strut arrangement, a first strut dimension, a first strut geometry or a first strut material, and the expandable frame 184 may comprise one or more of a second strut arrangement, a second strut dimension, a second strut arrangement or a second strut material different from the one or more of the first strut arrangement, the first strut dimension, the first strut geometry or the first strut material, such that the skeleton 140 is urged radially inward with a recoil force greater than a recoil force of the frame 184 when a balloon placed within a lumen of the frame 184 is deflated.
FIGS. 7B1 to 7B3 show components and construction of a temporary valve 185 comprising leaflets 187 in accordance with embodiments of the present technology. The temporary valve 185 may comprise a sheet of material 189 such as PTFE, woven or knit polyester, bovine pericardium, porcine valve tissue, or other suitable material. The sheet of material 189 can be folded in half and stitched with ePTFE sutures so as to form a cylinder 159 with 3 inner pockets. The inner walls of the three pockets are folded toward the center of the cylinder 159 so as to appose one another, thus forming the leaflets 187 of the temporary valve 185. The temporary valve 185 can be attached to both ends of the skeleton 140 with polypropylene and ePTFE sutures, for example.
The temporary valve 185 can be configured to receive a separate catheter-delivered prosthetic valve 180 such that the prosthetic valve 180 substantially displaces leaflets 187 of the first valve 185 when the prosthetic valve 180 is coupled to the support 110. The temporary valve 185 may comprise one or more leaflets 187 adapted so as to increase one or more of compression or friction with the prosthetic valve 180 when an expandable frame 184 of the prosthetic valve 180 is urged against the one or more leaflets 187. The support 110 may comprises a covering over its inner wall 158, and the covering may have a thickness sufficient so as to provide one or more of friction or compression when an expandable frame 184 of the prosthetic valve 180 is expanded within the support 110. The one or more leaflets 187 of temporary valve 185 can also be adapted to increase compression or the friction with the prosthetic valve 180 when sandwiched between the support 110 and the expandable frame 184 of the prosthetic valve 180.
In alternative embodiments, a temporary valve 185 mounted within the support 110 may be configured to be removed prior to coupling a permanent prosthetic valve 180 to the support 110. The temporary valve 185 may be mounted within support 110 by detachable couplings, for example perforated regions of the leaflets 187 that allow the leaflets 187 to be torn away easily. Alternatively, the leaflets 187 may be coupled to the support by sutures or other fasteners that can be cut with catheter-delivered cutting tools. The temporary valve 185 may also be made of a bioerodible material configured to erode and dissolve into the blood over a period of 2 hours to 2 months following implantation.
Instead of a temporary valve 185, a permanent valve may be attached to support 110 and implanted therewith. The permanent valve may be constructed similarly to temporary valve 185 as described above, or like any of the commercially available percutaneous heart valves. In any case, the permanent valve will be collapsible so as to have a profile suitable for percutaneous delivery, and expandable with support 110 for implantation at the native valve location.
In the delivery configuration shown in
Operatively, in the delivery configuration as shown in
The delivery catheter 200 may then be moved proximally (upstream in the illustrated
Referring to
Once the delivery catheter 200 is at the target site, the outer sheath 20 can be retracted as shown in
In some embodiments, the apparatus 100 may have an active mechanism for urging the arms 120 inwardly toward support 110 to more forcefully compress the leaflets between the arms 120 and the support 110.
In an alternative configuration, shown in
Belt 250 may be coupled to the arms 120 in various ways.
In a further embodiment, the arm 120 may have a hole, eyelet or other feature integrally formed in the arm itself through which the belt 250 may pass.
The above detailed descriptions of embodiments of the technology are not intended to be exhaustive or to limit the technology to the precise form disclosed above. Although specific embodiments of, and examples for, the technology are described above for illustrative purposes, various equivalent modifications are possible within the scope of the technology, as those skilled in the relevant art will recognize. For example, while steps are presented in a given order, alternative embodiments may perform steps in a different order. The various embodiments described herein may also be combined to provide further embodiments.
From the foregoing, it will be appreciated that specific embodiments of the technology have been described herein for purposes of illustration, but well-known structures and functions have not been shown or described in detail to avoid unnecessarily obscuring the description of the embodiments of the technology. Where the context permits, singular or plural terms may also include the plural or singular term, respectively.
Moreover, unless the word “or” is expressly limited to mean only a single item exclusive from the other items in reference to a list of two or more items, then the use of “or” in such a list is to be interpreted as including (a) any single item in the list, (b) all of the items in the list, or (c) any combination of the items in the list. Additionally, the term “comprising” is used throughout to mean including at least the recited feature(s) such that any greater number of the same feature and/or additional types of other features are not precluded. It will also be appreciated that specific embodiments have been described herein for purposes of illustration, but that various modifications may be made without deviating from the technology. Further, while advantages associated with certain embodiments of the technology have been described in the context of those embodiments, other embodiments may also exhibit such advantages, and not all embodiments need necessarily exhibit such advantages to fall within the scope of the technology. Accordingly, the disclosure and associated technology can encompass other embodiments not expressly shown or described herein.
The present application is a continuation of U.S. patent application Ser. No. 16/999,883, filed Aug. 21, 2020, which is a continuation of U.S. patent application Ser. No. 16/020,851, filed Jun. 27, 2018, now U.S. Pat. No. 10,751,173, which is a continuation of U.S. patent application Ser. No. 15/415,091, filed Jan. 25, 2017, now U.S. Pat. No. 10,034,750, which is a continuation of U.S. patent application Ser. No. 15/146,750, filed May 4, 2016, now U.S. Pat. No. 9,585,751, which is a continuation of U.S. patent application Ser. No. 14/807,788, filed Jul. 23, 2015, now U.S. Pat. No. 9,579,196, which is a continuation of U.S. patent application Ser. No. 13/949,098, filed Jul. 23, 2013, now U.S. Pat. No. 9,125,740, which is a continuation of International Application No. PCT/US2012/043636, filed Jun. 21, 2012, entitled “PROSTHETIC HEART VALVE DEVICES AND ASSOCIATED SYSTEMS AND METHODS,” which claims priority to U.S. Provisional Patent Application No. 61/499,632, filed Jun. 21, 2011, entitled “HEART VALVE REPLACEMENT METHODS AND APPARATUS,” the disclosures of each of these applications is incorporated herein by reference in its entireties.
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