Percutaneously-deliverable dual-frame valve

Abstract

A prosthetic valve comprises a first frame, defining an arrangement of cells; a second frame, a first protrusion, and a second protrusion. In an expanded state of the valve, the first frame is generally cylindrical and has an expanded width, and the valve defines a lumen having a first end and a second end. In a compressed state of the valve, the first and second frames are both generally cylindrical, and the first frame has a compressed width that is smaller than the expanded width. In the expanded state, the valve provides directional fluid flow through the lumen. The valve defines first and second coupling points, and an axis therebetween, the axis lying on a transverse cross-section of the first frame. The first and second coupling points couple the second frame to the first frame by protruding into respective first and second slots defined by the first frame.

Description

FIELD OF THE INVENTION

Some applications of the present invention relate in general to valve replacement. More specifically, some applications of the present invention relate to prosthetic valves for replacement of a cardiac valve.

BACKGROUND

Ischemic heart disease causes regurgitation of a heart valve by the combination of ischemic dysfunction of the papillary muscles, and the dilatation of the ventricle that is present in ischemic heart disease, with the subsequent displacement of the papillary muscles and the dilatation of the valve annulus.

Dilation of the annulus of the valve prevents the valve leaflets from fully coapting when the valve is closed. Regurgitation of blood from the ventricle into the atrium results in increased total stroke volume and decreased cardiac output, and ultimate weakening of the ventricle secondary to a volume overload and a pressure overload of the atrium.

SUMMARY OF THE INVENTION

A percutaneously-deliverable (e.g., transluminally-deliverable) mechanical prosthetic valve, comprising a tubular element and a valve member is described. Typically, the tubular element and valve member are restrained in respective compressed configurations for delivery, and automatically expand into respective expanded configurations when released at the native valve.

There is therefore provided, in accordance with an application of the present invention, apparatus for regulating blood flow of a subject, the apparatus including a prosthetic valve, the prosthetic valve:

including:

• • a tubular element, shaped to define a lumen therethrough, and
  • a valve member, configured to be coupled to the tubular element and to be disposed within the lumen, and

having:

• • a compressed configuration in which the lumen has a compressed width, the valve member is generally cylindrical, and the prosthetic valve is configured to be percutaneously delivered into the subject, and
  • an expanded configuration in which:
    • the lumen has an expanded width that is greater than the compressed width, and
    • the valve member is generally disc-shaped, is coupled to the tubular element, and is disposed within the lumen.

In an application, the prosthetic valve is configured to function as a check valve when in the expanded configuration thereof, and not when in the compressed configuration thereof.

In an application, in the compressed configuration, the valve member is coupled to the tubular element.

In an application, in the compressed configuration, the valve member is disposed within the lumen.

In an application:

the lumen has a first end and a second end, and

the valve member, when the valve is in the expanded configuration thereof:

• • has an open state, in which the first and second ends of the lumen are in fluid communication with each other,
  • has a closed state, in which the first and second ends of the lumen are generally not in fluid communication with each other, and
  • is movable between the open and closed states.

In an application, in the expanded configuration, the valve member is configured to move between the open and closed states in response to changes in relative pressure between the first and second ends of the lumen.

In an application, in the expanded configuration, the valve member, in at least the closed state thereof, has a diameter that is no more than 20 percent smaller than the expanded width of the lumen.

In an application, the valve member has a compressed diameter in the compressed configuration of the prosthetic valve, and an expanded diameter in the in the expanded configuration of the prosthetic valve, and the expanded diameter is at least twice as great as the compressed diameter.

In an application, in the expanded configuration, the prosthetic valve is configured to act as a check valve.

In an application, in the expanded configuration, the valve member is configured to move toward the open state when pressure at the first end of the lumen is greater than pressure at the second end of the lumen, and to move toward the closed state when pressure at the second end of the lumen is greater than pressure at the first end of the lumen.

In an application, the valve member is coupled to the tubular element at at least two coupling points, the coupling points defining an axis therebetween.

In an application, the valve member is configured to move between the open and closed states thereof, by rotating around the axis between the coupling points.

In an application, the valve member is configured to move between the open and closed states thereof, by deflecting around the axis between the coupling points.

In an application, the apparatus further includes a coupling rod, coupled to the coupling points, and coupled to the valve member along the axis between the coupling points, and the valve member is configured to move between the open and closed states thereof, by bending around the coupling rod.

In an application, the prosthetic valve includes a coupling element that includes at least one strut, the strut being coupled to the tubular element, and to the valve member at a coupling point that is generally midway across a diameter of the valve member, and the valve member is configured to move between the open and closed states by deflecting from the coupling point.

In an application, the valve member is configured to move between the open and closed states by collapsing and expanding.

In an application, the valve member is configured to move between the open and closed states thereof without changing a shape thereof.

In an application, the prosthetic valve is configured such that, when the valve member moves toward the open state, at least part of the valve member moves toward the first end of the lumen and at least part of the valve member moves toward the second end of the lumen.

In an application, the valve member is configured to move between the open and closed states thereof by changing a shape thereof.

In an application, the valve member is configured to be biased toward being in the closed state thereof.

In an application, in the compressed configuration, the prosthetic valve has a greatest transverse diameter of less than 12 mm.

In an application, in the compressed configuration, the prosthetic valve has a greatest transverse diameter of less than 9 mm.

In an application, in the compressed configuration, the prosthetic valve has a greatest transverse diameter of less than 6 mm.

In an application, the prosthetic valve is intracorporeally expandable from the compressed configuration to the expanded configuration.

In an application, the prosthetic valve is configured to be percutaneously delivered in the constrained configuration thereof, by being restrained in the compressed configuration during the percutaneous delivery, and the prosthetic valve is configured to automatically expand toward the expanded configuration thereof when no longer restrained.

The present invention will be more fully understood from the following detailed description of applications thereof, taken together with the drawings, in which:

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1A-D are schematic illustrations of a prosthetic valve, comprising a tubular element and a valve member, in accordance with some applications of the invention;

FIGS. 2A-B are schematic illustrations of the valve member, in accordance with respective applications of the invention;

FIGS. 3A-B are schematic illustrations of a prosthetic valve in open and closed states thereof, in accordance with some applications of the invention;

FIGS. 4A-C are schematic illustrations of a prosthetic valve, comprising a tubular element and a valve member, in accordance with some applications of the invention; and

FIGS. 5A-C are schematic illustrations of a prosthetic valve comprising a tubular element and a valve member, in accordance with some applications of the invention.

DETAILED DESCRIPTION OF EMBODIMENTS

Reference is made to FIGS. 1A-D, which are schematic illustrations of a prosthetic valve 20, comprising a tubular element 22 and a valve member 24, in accordance with some applications of the invention. It is to be noted that throughout this application, including the specification and the claims, the term “valve member” is defined as the movable obstruction (e.g., inside the tubular element) that restricts and/or controls flow through the valve, as is known in the general valve art. Prosthetic valve 20 is configured to be placed in a lumen of the body of the subject, such as in a blood vessel and/or at a native valve of the subject. Typically, prosthetic valve 20 is configured to be placed at a native heart valve of a subject, and to replace native functionality of the native valve. FIG. 1A shows tubular element 22 alone, FIG. 1B shows valve member 24 alone, FIG. 1C shows valve 20 in a compressed configuration thereof, and FIG. 1D shows valve 20 in an expanded configuration thereof, in accordance with some applications of the invention.

FIG. 1A shows tubular element 22, in an expanded configuration thereof, in accordance with some applications of the invention. Tubular element 22 is shaped to define a lumen 23 therethrough, and has a length d1 along a longitudinal axis of the tubular element, from a first end of the lumen to a second end of the lumen (e.g., from a first end of element 22 to a second end of element 22). Lumen 23 is defined by an inner surface 36 (FIG. 1D) of tubular element 22, and has a width d2. That is, d2 represents an inner width of tubular element 22. Typically, tubular element 22 is generally cylindrical (i.e., element 22 has a generally circular transverse cross-section), and width d2 represents a diameter of lumen 23. Alternatively, tubular element 22 has a transverse cross-section that is not generally circular, and width d2 represents a maximum width of lumen 23.

Typically, length d1 is greater than 10 mm and/or less than 30 mm (e.g., 10-30 mm). Typically, width d2 is greater than 20 mm and/or less than 40 mm (e.g., 20-40 mm, such as 30 mm). That is, in the expanded configuration thereof (as shown in FIG. 1A), tubular element 22 has length of greater than 10 mm and/or less than 30 mm, and an inner width of greater than 20 mm and/or less than 40 mm.

Typically, tubular member 22 comprises a frame 26 that defines a circumferentially-repeating arrangement of cells 27. Typically, frame 26 defines, along length d1, longitudinal columns c1 comprising one cell 27, alternating with longitudinal columns c2 comprising two cells. Typically, frame 26 defines circumferential rows comprising more than 10 and/or less than 25 cells 27 (e.g., 18 cells). It is to be noted, however, that the scope of the invention includes other configurations of frame 26.

FIG. 1B shows valve member 24, in an expanded configuration thereof, in accordance with some applications of the invention. Valve member 24 typically has a shape that is similar to that of lumen 23 of tubular element 22. That is, a transverse cross-section of valve member 24 typically has a shape that is similar to the shape of the transverse cross-section of lumen 23. For example, for applications in which tubular element 22 is generally cylindrical, valve member 24 typically has a generally disc-shaped transverse cross-section. For such applications, other dimensions and/or shapes of valve member 24 may vary (e.g., as described with reference to FIGS. 2A-B).

Typically, valve member 24 has a width d4 that is no more than 20 percent smaller than width d2 of tubular element 22 (e.g., no more than 10 percent smaller, such as no more than 5 percent smaller). For applications in which tubular element 22 is generally cylindrical and valve member is generally disc-shaped, widths d3 and d4 represent transverse cross-sectional diameters of lumen 23 and valve member 24, respectively, and the diameter of valve member 24 is typically no less than 20 percent smaller than the diameter of lumen 23 (i.e., no less than 20 percent smaller than the inner diameter of tubular element 22). Thereby, width d4 is typically greater than 20 mm and/or less than 40 mm (e.g., 20-40 mm, such as 30 mm).

Typically, valve member 24 comprises a frame 28 that defines an outer edge 30, an inner edge 32, and a radially-repeating arrangement of cells 29, disposed between the inner and outer edges. Inner edge 32 defines an opening 42, the presence of which facilitates compression of valve member 24 into the compressed configuration thereof (e.g., as described with reference to FIG. 1C). That is, the absence of frame material at opening 42 facilitates compression of the valve member into a generally cylindrical shape. Typically, opening 42 has a width d5 (e.g., a diameter) of more than 5 mm and/or less than 20 mm (e.g., between 5 and 20 mm, such as 12 mm). Alternatively or additionally, frame 28 may comprise a portion of increased flexibility, e.g., instead of defining opening 42.

For clarity, FIGS. 1A-B show frames 26 and 28 of tubular element 22 and valve member 24, respectively. However, tubular element 22 and valve member 24 comprise a covering 40, e.g., as shown in FIGS. 1C-D. Covering 40 covers at least part of frames 26 and 28. Non-limiting examples of materials that covering 40 may comprise, include cotton and polymers (e.g., polyester). Typically the covering has a thickness that is less than 1 mm (e.g., between 0.05 mm and 0.6 mm).

FIG. 1C shows valve 20 in the compressed configuration thereof, in which valve member 24, in a compressed configuration thereof, is disposed within lumen 23 of tubular element 22, in the compressed configuration thereof. FIG. 1D shows valve 20 in the expanded configuration thereof, in which valve member 24, in an expanded configuration thereof, is disposed within lumen 23 of tubular element 22, in an expanded configuration thereof.

Valve 20 is configured to be percutaneously (e.g., transcatheterally and/or transluminally, such as transfemorally) delivered to the native heart valve of a subject, by being compressed (e.g., “crimped”) into the compressed configuration thereof (i.e., a delivery configuration thereof). Valve 20 is typically configured to be restrained in the compressed configuration (e.g., by an overtube) during delivery of the valve, and to automatically move into an expanded configuration when released (e.g., by being deployed from the overtube). Typically, frames 26 and 28 comprise a shape-memory material such as, but not limited to, nitinol, which facilitates this automatic expansion.

Covering 40 typically covers inner surface 36 of cylindrical element 22 and at least one side of valve member 24, including opening 42. Opening 42 is thereby an opening in frame 28 but typically not an opening in covering 40, and thereby typically not an opening through the entire of valve member 24 (FIG. 1D).

As described hereinabove, tubular element 22 is typically generally cylindrical.

That is, element 22 is typically generally cylindrical in the expanded configuration thereof. Tubular element 22 is typically also generally cylindrical in the compressed configuration thereof. In the compressed configuration thereof, tubular element 22 (e.g., lumen 23 thereof) has a width d6 (e.g., a diameter) that is smaller than width d2 of the tubular element in the compressed configuration thereof. Typically, width d2 is more than 1.5 times (e.g., more than 4 times) greater than width d6.

As described hereinabove, valve member 24 is typically generally disc-shaped. That is, member 24 is typically generally disc-shaped in the expanded configuration thereof. In the compressed configuration thereof, valve member 24 is typically elongate, such as generally cylindrical, and has a width (e.g., a diameter) d7. Typically, width d4 (FIG. 1B) is more than twice (e.g., more than 5 times, such as more than 10 times) greater than width d7. Typically, when valve member 24 moves from the compressed configuration to the expanded configuration, (1) a first end 33 of the cylinder defined by valve member 24 in the compressed configuration, expands to define outer edge 30 of the valve member in the expanded configuration, and a second end 35 of the cylinder expands to define inner edge 32. It is to be noted that covering 40 covers opening 42 in frame 28, and therefore inner edge 32 is an inner edge of frame 28, and does not define an opening through the entire of valve member 24.

Valve member 24 is typically disposed in lumen 23 of tubular element 22, in both the compressed configuration and the expanded configuration of valve 20. Valve member 24 is coupled to tubular element 22 at one or more (e.g., two) coupling points 60. Coupling points 60 comprise a coupling element 61, which may comprise a hinge, a connector (e.g., a connecting wire or suture), or any other suitable coupling element. For some applications, and as shown in FIG. 1D, coupling element 61 comprises a hinge formed by a protrusion 59 of frame 28 protruding into a slot 57 defined by frame 26. Typically, and as described in more detail with reference to FIGS. 3A-B, valve 20 further comprises one or more valve seats 62, configured to facilitate sealing between tubular element 22 and valve member 24.

Typically, width d6 is greater than 2 mm and/or less than 12 mm (e.g., 2-10 mm, such as 3-6 mm). Typically, width d7 is greater than 2 mm and/or less than 10 mm (e.g., 2-8 mm, such as 2-6 mm). Typically, valve member 24 is configured to be compressible such that width d7 is smaller than width d6 in a maximally-compressed configuration of cylindrical element 22, e.g., such that cylindrical element 22 is compressible to generally the same width in the presence or absence of valve member 24.

As described hereinabove, prosthetic valve 20 is configured to be placed (i.e., implanted) at a native heart valve of a subject, and to replace native functionality of the native valve. Prosthetic valve 20 is configured to act as a one-way valve (e.g., a check valve). That is, prosthetic valve 20 is configured to generally allow blood to flow in a first direction through lumen 23 of tubular element 22, and to inhibit blood from flowing in a second direction through the lumen. Typically, prosthetic valve 20 resembles and/or is configured to act as a “tilting disc” valve, as is known in the valve art. Valve member 24, disposed in lumen 23 of tubular element 22, provides valve functionality by being configured to move between an open state and a closed state in response to changes in relative pressure between each end of the lumen of tubular element 22 (i.e., in response to changes in relative pressure between blood at each end of the lumen; e.g., as described hereinbelow with reference to FIGS. 3A-B). Movement of valve member 24 between the open and closed states thereof, thereby moves prosthetic valve 20 between open and closed states thereof.

Reference is made to FIGS. 2A-B, which arc schematic illustrations of valve member 24, in accordance with respective applications of the invention. As described hereinabove, valve member 24 is typically disc-shaped in the expanded configuration thereof. FIG. 2A shows valve member 24, comprising a disc-shaped valve member 24a in the expanded configuration thereof, in accordance with some applications of the invention. As described hereinabove, frame 28 and opening 42 of valve member 24 are typically covered in covering 40.

For some applications, valve member 24 has a shape that is different to a flat disc. FIG. 2B shows valve member 24, comprising a frustoconical valve member 24b in the expanded configuration thereof, in accordance with some applications of the invention. For some applications of the invention, frame 28 of valve member 24b comprises a frame 28b, which is configured to assume a frustoconical shape. For some applications of the invention, covering 40 of valve member 24b comprises a covering 40b, which is configured to facilitate the valve member assuming the frustoconical shape, e.g., by restricting full expansion of the frame. For some such applications, valve member 24b comprises frame 28 (i.e., the same frame as member 24a), and the assuming of the frustoconical shape of valve member 24b is facilitated mainly (e.g., solely) by covering 40b.

It is to be noted that FIGS. 2A-B show non-limiting examples of possible shapes of valve member 24, and that the scope of the invention includes valve member 24 having other shapes. Similarly, it is to be noted that, although tubular element 22 is shown as being substantially cylindrical, the scope of the invention includes tubular element 22 having other shapes, e.g., so as to facilitate blood flow, so as to conform to the shape of the native valve, and/or so as to facilitate coupling to the native valve and/or to auxiliary apparatus, such as a prosthetic valve support, such as the prosthetic valve supports described in US 2012/0022640 to Gross et al., which is incorporated herein by reference. For example, tubular element 22 may comprise and/or define flared ends, barbs, clips, or any other such features, e.g., as are known in the art.

Reference is made to FIGS. 3A-B, which are schematic illustrations of functioning of valve 20, in accordance with respective applications of the invention. FIGS. 3A-B show valve member 24 as disc-shaped (e.g., as shown for valve member 24a, described with reference to FIG. 2A), but valve members of other shapes may be used, and typically function similarly, mutatis mutandis.

Valve member 24 is coupled to tubular element 22 at one or more coupling points 60, such that the valve member can rotate between (1) an open state in which the valve member generally allows fluid (e.g., blood) to flow through lumen 23, and (2) a closed state in which the valve member generally blocks lumen 23, thereby generally inhibiting fluid from flowing through the lumen. Typically, valve member 24 is coupled to tubular element 22 at two coupling points 60 (e.g., coupling points 60a and 60b), such that the valve member can rotate around an axis a1 between the two coupling points. Typically, valve member 24 does not change shape when moving between the open and closed states. FIG. 3A shows valve member 24 (and thereby valve 20) in the closed state thereof, and FIG. 3B shows valve member 24 (and thereby valve 20) in the open state thereof.

Typically, coupling points 60a and 60b do not lie on a central transverse axis a2 of tubular element 22. That is, axis a1 is typically a non-diameter chord of a transverse cross-section of tubular element 22. Such a configuration typically facilitates the functioning of valve 20 as a tilting-disc valve, as is known in the art.

Valve 20 is configured such that valve member 24 moves between the open state and the closed state in response to changes in relative fluid pressure between each end of lumen 23, and thereby valve 20 is configured to act as a one-way valve (e.g., a check valve). In the open state, a first end 64 of tubular element 22 is in fluid communication with a second end 66 of the tubular element. In the closed state, fluid communication between the two ends is reduced, compared to in the open state (e.g., the first and second ends are substantially not in fluid communication).

As shown in FIG. 3A, when fluid pressure at a second end 66 of tubular member 22 is higher than fluid pressure at a first end 64 of the tubular member (e.g., when fluid “tries” to move from the second end to the first end), valve member 24 is in (e.g., moves into) the closed state, thereby inhibiting flow of the fluid from the second end to the first end. As shown in FIG. 3B, when fluid pressure at first end 64 is higher than fluid pressure at second end 66 (e.g., when fluid “tries” to move from the first end to the second end), valve member 24 moves into the open state, thereby facilitating flow of the fluid from the first end to the second end. Thereby, valve 20 acts as a check-valve (e.g., a tilting-disc valve), first end 64 is an upstream end of the valve, and second end 66 is a downstream end of the valve. It is to be noted that, when the valve member moves toward the open state, part of valve member 24 moves toward first end 64 (i.e., upstream), and part of the valve member moves toward second end 66 (i.e., downstream).

Valve member 24 is typically configured (e.g., dimensioned) such that, in the closed state, outer edge 30 (see FIG. 1B) of the valve member is positioned closely to the inner surface of tubular element 22 (e.g., the valve member is in close contact with the inner surface of the tubular element). For example, and as described hereinabove, the diameter of valve member 24 is typically no more than 20 percent smaller than the width of the lumen of the tubular element.

For some applications of the invention, valve 20 further comprises at least one valve seat 62, configured to facilitate contact (e.g., sealing) between valve member 24 and tubular element 22. For some such applications, and as shown in FIGS. 3A-B, seat 62 comprises two arc-shaped seats 62a and 62b that are disposed on the inner surface of the tubular element, and form respective arcs whose endpoints are adjacent to coupling points 60a and 60b. For example, and as shown in FIGS. 3A-B, (1) seat 62a forms a major arc between coupling points 60a and 60b, disposed slightly closer than coupling points 60 to first end 64, and (2) seat 62b forms a complementary minor arc, disposed slightly closer than coupling points 60 to second end 66.

Seats 62a and 62b protrude into lumen 23 of tubular element 22, so as to facilitate sealing between the tubular element and valve member 24. For some applications, the seats comprise a sealing element, such as a sealing surface, to further facilitate such sealing. Typically, the seats and/or sealing elements comprise a fabric, a resin and/or a polymer and are configured to fold, crumple, contract, and/or compress when valve 20 is compressed into the compressed configuration thereof, and to unfold, uncrumple, expand, and/or uncompress into the configuration shown in FIGS. 3A-B, when valve 20 is moved into the uncompressed configuration thereof. For example, the seats may comprise a fabric, sutured to frame 26, and configured to crumple and uncrumple when valve 20 is compressed and uncompressed, respectively. Alternatively or additionally, the seats may comprise an elastic material, such as rubber silicone, that is configured to compress and stretch when valve 20 is compressed and uncompressed, respectively.

Reference is made to FIGS. 4A-C, which are schematic illustrations of a prosthetic valve 80, comprising a tubular element 82 and a valve member 84, in accordance with some applications of the invention. FIG. 4A shows valve 80 in a compressed configuration thereof, and FIGS. 4B-C show valve 80 in an expanded configuration thereof, and functioning, in accordance with some applications of the invention.

Typically, tubular element 82 comprises and/or has features of tubular element 22, described hereinabove (e.g., with reference to FIGS. 1A-D). For example, tubular element 82 defines a lumen 83 therethrough, typically comprises a frame that defines a plurality of cells, and is typically expandable (e.g., automatically) from a generally cylindrical compressed configuration (FIG. 4A) to a generally cylindrical expanded configuration (FIG. 4B).

Typically, valve member 84 comprises and/or has features of valve member 24, described hereinabove (e.g., with reference to FIGS. 1A-D and/or 2A-B). For example, valve member 84 is typically disc-shaped, typically comprises a frame that defines a plurality of cells, and is typically expandable (e.g., automatically) from a generally cylindrical compressed configuration (FIG. 4A) to a generally disc-shaped expanded configuration (FIG. 4B).

Typically, the dimensions of valve 80 (e.g., the dimensions of tubular element 82 and valve member 84) are similar (e.g., the same as) those of valve 20 (e.g., of tubular element 22 and valve member 24), described hereinabove, mutatis mutandis.

As shown in FIG. 4A, in the compressed configuration of valve 80, valve member 84, in the generally cylindrical compressed configuration thereof, is typically disposed within lumen 83 of tubular element 82, in the generally cylindrical compressed configuration thereof. As shown in FIG. 4B, in the expanded configuration of valve 80, valve member 84, in the generally disc-shaped expanded configuration thereof, is disposed within lumen 83 of tubular element 82, in the generally cylindrical expanded configuration thereof.

Valve 80 comprises covering 40, which covers at least part of the frames of tubular element 82 and valve member 84 (e.g., as described hereinabove for valve 20, mutatis mutandis). Typically, covering 40 covers an inner surface 96 of tubular element 82, and at least one side of valve member 84. Valve 80 is configured to be delivered percutaneously (e.g., transcatheterally and/or transluminally, such as transfemorally), e.g., as described hereinabove with respect to valve 20, mutatis mutandis.

Valve member 84 is coupled to tubular element 82 at one or more (e.g., two) coupling points 100, in both the compressed and expanded configurations of valve 80. Coupling points 100 comprise a coupling element, which may comprise a hinge, a connector (e.g., a connecting wire or suture), or any other suitable coupling element. For some applications, and as described for coupling element 61 hereinabove, each coupling element of valve 80 comprises a protrusion of the frame of the valve member protruding into a slot defined by frame of the tubular element.

Valve member 84 is coupled to tubular element 82 at the one or more coupling points 100, such that the valve member can move between (1) an open state in which the valve member generally allows fluid (e.g., blood) to flow through lumen 83, and (2) a closed state in which the valve member generally blocks lumen 83, thereby generally inhibiting fluid from flowing though the lumen. FIG. 4B shows valve member 84 (and thereby valve 80) in the closed state thereof, and FIG. 4C shows valve member 84 (and thereby valve 80) in the open state thereof.

Typically, valve member 84 is coupled to tubular element 82 at two coupling points 100 (e.g., coupling points 100a and 100b), such that valve member 84 can deflect (e.g., bend) around an axis a3 between the two coupling points. Typically, coupling points 100a and 100b lie on a central transverse axis a4 (e.g., a diameter) of tubular element 82, and axis a3 acts as a central fixed axis around which each resulting half of valve member 84 deflects. Further typically, and as shown in FIGS. 4A-C, the coupling element of valve 80 comprises a coupling rod 92, which is coupled to valve member 84 along axis a3, and to coupling points 100a and 100b, such that the valve member can move between the open and closed states by bending around the coupling rod. Coupling rod 92 is configured to be bent when valve 80 is compressed into the compressed configuration thereof (FIG. 4A), and to assume a generally straight configuration when the valve assumes the expanded configuration thereof (FIGS. 4A-B).

For some applications of the invention, valve member 84 comprises valve member 24, described hereinabove. For some applications of the invention, valve member 84 is unevenly rigid. For example, the valve member may define an area of increased flexibility at and/or around axis a3 (e.g., at and/or around coupling rod 92), so as to facilitate the movement of valve member 84 between the open and closed states described hereinabove. It is to be noted that, whereas valve member 24 of prosthetic valve 20 typically moves between the open and closed states thereof without changing shape, valve member 84 of prosthetic valve 80 typically does change shape when moving between the open and closed states thereof.

Valve 80 is configured such that valve member 84 moves between the open state and the closed state in response to changes in relative fluid pressure between each end of lumen 83, and thereby valve 80 is configured to act as a one-way valve (e.g., a check valve). In the open state, a first end 104 of tubular element 82 is in fluid communication with a second end 106 of the tubular element. In the closed state, fluid communication between the two ends is reduced, compared to in the open state (e.g., the first and second ends are substantially not in fluid communication).

As shown in FIG. 4B, when fluid pressure at a second end 106 of tubular element 82 is higher than fluid pressure at a first end 104 of the tubular member (e.g., when fluid “tries” to move from the second end to the first end), valve member 84 is in (e.g., moves into) the closed state, thereby inhibiting flow of the fluid from the second end to the first end. As shown in FIG. 4C, when fluid pressure at first end 104 is higher than fluid pressure at second end 106 (e.g., when fluid “tries” to move from the first end to the second end), valve member 84 moves into the open state, thereby facilitating flow of the fluid from the first end to the second end. Thereby, valve 80 acts as a check-valve, first end 104 is an upstream end of the valve, and second end 106 is a downstream end of the valve.

For some applications of the invention, movement of valve member 84 between the open and closed states thereof is driven primarily by the relative pressure at each end of lumen 83. For some applications, valve member 84 is biased (e.g., shape-set) toward assuming the closed state, e.g., in the absence of any substantial forces thereon.

Valve member 84 is typically configured (e.g., dimensioned) such that, in the closed state, an outer edge 90 of the valve member is disposed close to inner surface 96 of tubular element 82 (e.g., the valve member is in close contact with the inner surface of the tubular element). For example, the diameter of valve member 84 is typically no more than 20 percent smaller than the width of the lumen of the tubular element.

For some applications of the invention, valve 80 further comprises a valve seat 102, configured to facilitate contact (e.g., sealing) between valve member 84 and tubular element 82. For some such applications, and as shown in FIGS. 4B-C, seat 102 is annular, and is disposed on the inner surface of tubular element 82, slightly closer than coupling points 100 to first end 104 of the tubular element. Seat 102 protrudes into lumen 83 of tubular element 82, so as to facilitate sealing between the tubular element and valve member 84. For some applications, the seats comprise a sealing element, such as a sealing surface, to further facilitate such sealing.

Typically, the seat and/or sealing element comprises a fabric, a resin and/or a polymer and is configured to fold, crumple, contract, and/or compress when valve 80 is compressed into the compressed configuration thereof (FIG. 4A), and to unfold, uncrumple, expand, and/or uncompress into the configuration shown in FIGS. 4B-C, when valve 80 is moved into the uncompressed configuration. For example, the seat may comprise a fabric, sutured to the frame of tubular element 82, and configured to crumple and uncrumple when valve 80 is compressed and uncompressed, respectively. Alternatively or additionally, the seat may comprise an elastic material, such as rubber silicone, that is configured to compress and stretch when valve 80 is compressed and uncompressed, respectively.

Reference is made to FIGS. 5A-C, which are schematic illustrations of a prosthetic valve 120, comprising a tubular element 122 and a valve member 124, in accordance with some applications of the invention. FIG. 5A shows valve 120 in a compressed configuration thereof, and FIGS. 5B-C show valve 120 in an expanded configuration thereof, and functioning, in accordance with some applications of the invention.

Typically, tubular element 122 comprises and/or has features of tubular element 22 and/or tubular element 82, described hereinabove (e.g., with reference to FIGS. 1A-D, and/or 4A-C). For example, tubular element 122 defines a lumen 123 therethrough, typically comprises a frame that defines a plurality of cells, and is typically expandable (e.g., automatically) from a generally cylindrical compressed configuration (FIG. 5A) to a generally cylindrical expanded configuration (FIG. 5B).

Typically, valve member 124 comprises and/or has features of valve member 24 and/or valve member 84, described hereinabove (e.g., with reference to FIGS. 1A-D, 2A-B and/or 4A-C). For example, valve member 124 is typically disc-shaped, typically comprises a frame that defines a plurality of cells, and is typically expandable (e.g., automatically) from a generally cylindrical compressed configuration (FIG. 5A) to a generally disc-shaped expanded configuration (FIG. 5B).

Typically, the dimensions of valve 120 (e.g., the dimensions of tubular element 122 and valve member 124) are similar (e.g., the same as) those of valve 20 (e.g., of tubular element 22 and valve member 24), described hereinabove, mutatis mutandis.

As shown in FIG. 5A, in the compressed configuration of valve 120, valve member 124, in the generally cylindrical compressed configuration thereof, is typically disposed within lumen 123 of tubular element 122, in the generally cylindrical compressed configuration thereof. As shown in FIG. 5B, in the expanded configuration of valve 120, valve member 124, in the generally disc-shaped expanded configuration thereof, is disposed within lumen 123 of tubular element 122, in the generally cylindrical expanded configuration thereof.

Valve 120 comprises covering 40, which covers at least part of the frames of tubular element 122 and valve member 124 (e.g., as described hereinabove for valves 20 and 80, mutatis mutandis). Typically, covering 40 covers an inner surface 136 of tubular element 82, and at least one side of valve member 84. Valve 80 is configured to be delivered percutaneously (e.g., transcatheterally and/or transluminally, such as transfemorally), e.g., as described hereinabove with respect to valves 20 and 80, mutatis mutandis.

Valve member 124 is coupled to tubular element 122 at at least one coupling point 140, in both the compressed and expanded configurations of valve 120. Valve 120 comprises a coupling element 141, which may comprise a hinge, a connector (e.g., a connecting wire or suture), or any other suitable coupling element. Typically, and as shown in FIGS. 5A-C, coupling element 141 comprises one or more struts 150 that protrude radially-inwardly from tubular element 122, and are coupled to a generally central point on valve member 124 (e.g., generally midway across the diameter of the valve member). Further typically, coupling element 141 comprises another strut 152 that is coupled to struts 150, extends longitudinally from struts 150, and couples struts 150 to valve member 124 by being coupled to the valve member.

Valve member 124 is coupled to tubular element 122 such that the valve member can move between (1) an open state in which the valve member generally allows fluid (e.g., blood) to flow through lumen 123, and (2) a closed state in which the valve member generally blocks lumen 123, thereby generally inhibiting fluid from flowing though the lumen. FIG. 5B shows valve member 124 (and thereby valve 120) in the closed state thereof, and FIG. 5C shows valve member 124 (and thereby valve 120) in the open state thereof. Typically, valve member 124 is coupled to tubular element 122 at coupling point 140 such that valve member 124 can deflect (e.g., bend, fold, and/or collapse) from the coupling point, such as by opening and closing in an umbrella-like or jellyfish-like fashion. Typically, coupling point 140 lies on a central longitudinal axis a5 of tubular element 122 and at the center of valve member 124. It is to be noted that, whereas valve member 24 of prosthetic valve 20 typically moves between the open and closed states thereof without changing shape, valve member 124 of prosthetic valve 120 typically does change shape when moving between the open and closed states thereof.

For some applications of the invention, valve member 124 comprises valve member 24 and/or valve member 84, described hereinabove. For some applications of the invention, valve member 124 is unevenly rigid. For example, the valve member may define one or more areas of increased flexibility that extend radially from coupling point 140 so as to facilitate the movement of valve member 124 between the open and closed states described hereinabove.

Valve 120 is configured such that valve member 124 moves between the open state and the closed state in response to changes in relative fluid pressure between each end of lumen 123, and thereby valve 120 is configured to act as a one-way valve (e.g., a check valve). In the open state, a first end 144 of tubular element 122 is in fluid communication with a second end 146 of the tubular element. In the closed state, fluid communication between the two ends is reduced, compared to in the open state (e.g., the first and second ends are substantially not in fluid communication).

As shown in FIG. 5B, when fluid pressure at a second end 146 of tubular element 122 is higher than fluid pressure at a first end 144 of the tubular member (e.g., when fluid “tries” to move from the second end to the first end), valve member 124 is in (e.g., moves into) the closed state, thereby inhibiting flow of the fluid from the second end to the first end. As shown in FIG. 5C, when fluid pressure at first end 144 is higher than fluid pressure at second end 146 (e.g., when fluid “tries” to move from the first end to the second end), valve member 124 moves into the open state, thereby facilitating flow of the fluid from the first end to the second end. Thereby, valve 120 acts as a check-valve, first end 144 is an upstream end of the valve, and second end 146 is a downstream end of the valve.

For some applications of the invention, movement of valve member 124 between the open and closed states thereof is driven primarily by the relative pressure at each end of lumen 123. For some applications, valve member 124 is biased (e.g., shape-set) toward assuming the closed state, e.g., in the absence of any substantial forces thereon.

Valve member 124 is typically configured (e.g., dimensioned) such that, in the closed state, an outer edge 130 of the valve member is disposed close to inner surface 136 of tubular element 122 (e.g., the valve member is in close contact with the inner surface of the tubular element). For example, the diameter of valve member 124 is typically no more than 20 percent smaller than the width of the lumen of the tubular element.

For some applications of the invention, valve 120 further comprises a valve seat 142, configured to facilitate contact (e.g., sealing) between valve member 124 and tubular element 122. For some such applications, and as shown in FIGS. 5B-C, scat 142 is annular, and is disposed on the inner surface of tubular element 122. Seat 142 protrudes into lumen 123 of tubular element 122, so as to facilitate sealing between the tubular element and valve member 124. For some applications, the seats comprise a sealing element, such as a sealing surface, to further facilitate such sealing.

Typically, the seat and/or sealing element comprises a fabric, a resin and/or a polymer and is configured to fold, crumple, contract, and/or compress when valve 120 is compressed into the compressed configuration thereof (FIG. 5A), and to unfold, uncrumple, expand, and/or uncompress into the configuration shown in FIGS. 5B-C, when valve 120 is moved into the uncompressed configuration. For example, the seat may comprise a fabric, sutured to the frame of tubular element 122, and configured to crumple and uncrumple when valve 120 is compressed and uncompressed, respectively. Alternatively or additionally, the seat may comprise an elastic material, such as rubber silicone, that is configured to compress and stretch when valve 120 is compressed and uncompressed, respectively.

Reference is again made to FIGS. 1A-5C. The prosthetic valves described hereinabove are typically configured to be compressed (e.g., crimped) so as to have a greatest diameter of less than 12 mm (e.g., less than 9 mm, such as less than 6 mm). The prosthetic valves described hereinabove are thereby typically advantageously configured to be delivered via a catheter that is 34 Fr or narrower (e.g., 24 Fr or narrower, such as 18 Fr or narrower), thereby facilitating percutaneous (e.g., transluminal, such as transfemoral) delivery.

Reference is again made to FIGS. 1A-5C. As described hereinabove, the valve member of each prosthetic valve is typically disposed within the lumen of the tubular element of that prosthetic valve, in both the compressed and uncompressed configurations of the prosthetic valve. It is to be noted that, for some applications, in the compressed configuration of the prosthetic valve, the valve member is disposed outside of the lumen of the tubular element. For example, in the compressed configuration of the prosthetic valve, the tubular element and the valve member may be generally collinear.

Reference is again made to FIGS. 1A-5C. As described hereinabove, the valve member of each prosthetic valve is typically coupled to the tubular element of that prosthetic valve, in both the compressed and uncompressed configurations of the prosthetic valve (e.g., during delivery and after implantation). It is to be noted that, for some applications, the valve member is intracorporeally couplable to the tubular element, such as after implantation of the tubular element. For example, the tubular element and valve member may be delivered sequentially, whilst connected via one or more guiding filaments, the guiding filaments facilitating juxtaposition and coupling of tubular element and valve member, such as by facilitating assembly of coupling element (e.g., by guiding a protrusion or rod into a slot).

Typically, the prosthetic valves described herein arc implanted (and/or configured to be implanted) at a native valve of the subject such that the first end is upstream of the second end. For example, the valves may be implanted at an atrioventricular valve of the subject (e.g., a mitral valve of the subject) such that the first end is disposed in an atrium of the subject (e.g., a left atrium of the subject) and the second end is disposed in a ventricle of the subject (e.g., a left ventricle of the subject). Thereby, the prosthetic valve replaces one-way valve functionality of the native valve, with one-way valve functionality of the prosthetic valve.

It will be appreciated by persons skilled in the art that the present invention is not limited to what has been particularly shown and described hereinabove. Rather, the scope of the present invention includes both combinations and subcombinations of the various features described hereinabove, as well as variations and modifications thereof that are not in the prior art, which would occur to persons skilled in the art upon reading the foregoing description.

Claims

1. Apparatus for use at a native valve of a heart of a subject, the apparatus comprising a prosthetic valve, the prosthetic valve comprising: a first frame, defining an arrangement of cells;a second frame;a first protrusion; anda second protrusion,

2. The apparatus according to claim 1, wherein, in the expanded state, the prosthetic valve provides directional fluid flow through the lumen by the second frame rotating around the axis in response to changes in relative fluid pressure between the first end and the second end.

3. The apparatus according to claim 1, wherein, in the expanded state, the prosthetic valve provides directional fluid flow through the lumen by the second frame rotating deflecting around the axis in response to changes in relative fluid pressure between the first end and the second end.

4. The apparatus according to claim 1, wherein the axis is a non-diameter chord of the transverse cross-section of the first frame.

5. The apparatus according to claim 1, wherein the first frame defines a flared end that facilitates coupling of the prosthetic valve to the native valve.

6. The apparatus according to claim 1, wherein in both the compressed state and the expanded state, the first frame circumscribes the second frame.

7. The apparatus according to claim 1, wherein, in the expanded state, the prosthetic valve provides directional fluid flow through the lumen by opening and closing, without the second frame changing shape, in response to changes in relative fluid pressure between the first end and the second end.

8. The apparatus according to claim 1, wherein both the first frame and the second frame comprise nitinol.

9. The apparatus according to claim 1, wherein, in the expanded state, difference between (i) a transverse cross-sectional diameter of the first frame, and (ii) a transverse cross-sectional diameter of the second frame, is no more than 5 percent.

10. The apparatus according to claim 1, wherein the second frame has a compressed diameter in the compressed configuration of the prosthetic valve, and an expanded diameter in the in the expanded configuration of the prosthetic valve, and wherein the expanded diameter is at least twice as great as the compressed diameter.

11. The apparatus according to claim 1, wherein the prosthetic valve is configured such that, while the second frame remains coupled to the first frame at the first coupling point and at the second coupling point, the second frame is movable with respect to the first frame such that at least part of the second frame moves toward the first end and at least part of the second frame moves toward the second end.

12. The apparatus according to claim 1, wherein the prosthetic valve is configured: to be transluminally delivered in the compressed configuration by being restrained in the compressed configuration during the transluminal delivery, andto automatically expand toward the expanded configuration thereof when no longer restrained.

13. The apparatus according to claim 1, further comprising a first covering that at least partly covers the first frame, and a second covering that at least partly covers the second frame.

14. The apparatus according to claim 13, wherein the first covering and the second covering are polymeric coverings.