Patent Grant
10201416
The present disclosure pertains to medical devices, and methods for manufacturing and/or using medical devices. More particularly, the present disclosure pertains to configurations of a replacement heart valve.
A wide variety of intracorporeal medical devices have been developed for medical use, for example, intravascular use. Some of these devices include guidewires, catheters, medical device delivery systems (e.g., for stents, grafts, replacement valves, etc.), and the like. These devices are manufactured by any one of a variety of different manufacturing methods and may be used according to any one of a variety of methods. Of the known medical devices and methods, each has certain advantages and disadvantages. There is an ongoing need to provide alternative medical devices as well as alternative methods for manufacturing and using medical devices.
In a first aspect, a locking mechanism for a medical implant may comprise a buckle member, a post member axially translatable with respect to the buckle member, the post member including a receiving portion proximate a proximal end of the post member, a distal end, a laterally-arched central body portion extending between the receiving portion and the distal end, and a cantilevered leg extending proximally from the distal end, and an actuator element including a proximal shaft portion and a distal engagement portion, the distal engagement portion being configured to releasably engage the receiving portion of the post member. The proximal shaft portion may be pivotable with respect to the distal engagement portion.
In addition or alternatively, and in a second aspect, the actuator element includes a hinge element disposed between the proximal shaft portion and the distal engagement portion.
In addition or alternatively, and in a third aspect, the post member includes at least one aperture extending therethrough proximate the distal end, the at least one aperture being configured to receive a coupling element therethrough.
In addition or alternatively, and in a fourth aspect, the distal engagement portion includes a lateral protrusion proximate a distal end of the distal engagement portion.
In addition or alternatively, and in a fifth aspect, the lateral protrusion is configured to engage with an aperture disposed within the receiving portion.
In addition or alternatively, and in a sixth aspect, the laterally-arched central body portion includes a tooth extending laterally therefrom.
In addition or alternatively, and in a seventh aspect, the tooth extends toward the cantilevered leg.
In addition or alternatively, and in an eighth aspect, the central body portion arches laterally in a first direction relative to the proximal end and the distal end, and the tooth extends laterally in the first direction from the central body portion.
In addition or alternatively, and in a ninth aspect, the cantilevered leg includes a longitudinally-oriented slot extending therethrough.
In addition or alternatively, and in a tenth aspect, the receiving portion includes a first portion and a second portion configured to splay apart as the post member is translated proximally within the buckle member to release the distal engagement portion therefrom.
In addition or alternatively, and in an eleventh aspect, the buckle member is formed of a substantially rigid material.
In addition or alternatively, and in a twelfth aspect, the central body portion is configured to flex towards a substantially straight configuration upon proximal translation through the buckle member.
In addition or alternatively, and in a thirteenth aspect, a replacement heart valve implant may comprise a tubular anchor member defining a central longitudinal axis; a plurality of locking mechanisms, each locking mechanism comprising a buckle member fixedly attached to the tubular anchor member, and a post member axially translatable with respect to the buckle member, the post member including a receiving portion proximate a proximal end of the post member, a distal end, a laterally-arched central body portion extending between the receiving portion and the distal end, and a cantilevered leg extending proximally from the distal end; a plurality of valve leaflets, wherein each valve leaflet is coupled to the cantilevered leg of at least one of the plurality of locking mechanisms; and a plurality of actuator elements corresponding to the plurality of locking mechanisms, each actuator element including a proximal shaft portion and a distal engagement portion, wherein the proximal shaft portion is pivotable relative to the distal engagement portion, wherein the distal engagement portion is releasably fixed to the receiving portion of one post member.
In addition or alternatively, and in a fourteenth aspect, the buckle member of each locking mechanism is positioned against an inner surface of the tubular anchor member.
In addition or alternatively, and in a fifteenth aspect, the plurality of valve leaflets is configured to shift between an everted position wherein a free end of each of the plurality of valve leaflets is disposed distally of the tubular anchor member, and a deployed position wherein the free end of each of the plurality of valve leaflets is disposed within the tubular anchor member.
In addition or alternatively, and in a sixteenth aspect, in the everted position, each of the plurality of actuator elements extends distally of the tubular anchor member.
In addition or alternatively, and in a seventeenth aspect, each of the plurality of valve leaflets is secured to the tubular anchor member at a secured end opposite the free end.
In addition or alternatively, and in an eighteenth aspect, a replacement heart valve implant may comprise a tubular anchor member defining a central longitudinal axis, the tubular anchor member being configured to shift between a delivery configuration and a deployed configuration; a plurality of locking mechanisms, each locking mechanism comprising a buckle member fixedly attached to the tubular anchor member, and a post member axially translatable with respect to the buckle member, the post member including a receiving portion proximate a proximal end of the post member, a distal end, a laterally-arched central body portion extending from the receiving portion to the distal end, and a cantilevered leg extending proximally from the distal end; a plurality of valve leaflets, wherein each valve leaflet is coupled to the cantilevered leg of at least one of the plurality of locking mechanisms; and a plurality of actuator elements corresponding to the plurality of locking mechanisms, each actuator element including a proximal shaft portion pivotably connected to a distal engagement portion, the distal engagement portion being releasably fixed to the receiving portion of one post member, wherein the distal engagement portion is configured to pivot with respect to the proximal shaft portion in a radial direction relative to the central longitudinal axis.
In addition or alternatively, and in a nineteenth aspect, each actuator element extends through the buckle member of its corresponding locking mechanism when the tubular anchor member is in the delivery configuration, and each actuator element is configured to translate the post member of its corresponding locking mechanism into engagement with the buckle member of its corresponding locking mechanism upon proximal retraction of the plurality of actuator elements.
In addition or alternatively, and in a twentieth aspect, the post member is at least partially disposed distally of the tubular anchor member when the tubular anchor member is in the delivery configuration, and the post member is locked within the buckle member when the tubular anchor member is in the deployed configuration.
The above summary of some embodiments, aspects, and/or examples is not intended to describe each disclosed embodiment or every implementation of the present disclosure. The Figures, and Detailed Description, which follow, more particularly exemplify these embodiments.
The disclosure may be more completely understood in consideration of the following detailed description of various embodiments in connection with the accompanying drawings, in which:
While aspects of the disclosure are amenable to various modifications and alternative forms, specifics thereof have been shown by way of example in the drawings and will be described in detail. It should be understood, however, that the intention is not to limit aspects of the disclosure to the particular embodiments described. On the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the disclosure.
The following description should be read with reference to the drawings, which are not necessarily to scale, wherein like reference numerals indicate like elements throughout the several views. The detailed description and drawings are intended to illustrate but not limit the claimed invention. Those skilled in the art will recognize that the various elements described and/or shown may be arranged in various combinations and configurations without departing from the scope of the disclosure. The detailed description and drawings illustrate example embodiments of the claimed invention.
For the following defined terms, these definitions shall be applied, unless a different definition is given in the claims or elsewhere in this specification.
All numeric values are herein assumed to be modified by the term “about,” whether or not explicitly indicated. The term “about”, in the context of numeric values, generally refers to a range of numbers that one of skill in the art would consider equivalent to the recited value (e.g., having the same function or result). In many instances, the term “about” may include numbers that are rounded to the nearest significant figure. Other uses of the term “about” (e.g., in a context other than numeric values) may be assumed to have their ordinary and customary definition(s), as understood from and consistent with the context of the specification, unless otherwise specified.
The recitation of numerical ranges by endpoints includes all numbers within that range, including the endpoints (e.g. 1 to 5 includes 1, 1.5, 2, 2.75, 3, 3.80, 4, and 5).
Although some suitable dimensions, ranges, and/or values pertaining to various components, features and/or specifications are disclosed, one of skill in the art, incited by the present disclosure, would understand desired dimensions, ranges, and/or values may deviate from those expressly disclosed.
As used in this specification and the appended claims, the singular forms “a”, “an”, and “the” include plural referents unless the content clearly dictates otherwise. As used in this specification and the appended claims, the term “or” is generally employed in its sense including “and/or” unless the content clearly dictates otherwise.
Relative terms such as “proximal”, “distal”, “advance”, “retract”, variants thereof, and the like, may be generally be considered with respect to the positioning, direction, and/or operation of various elements relative to a user/operator/manipulator of the device, wherein “proximal” and “retract” indicate or refer to closer to or toward the user and “distal” and “advance” indicate or refer to farther from or away from the user. Other relative terms, such as “upstream”, “downstream”, “inflow”, and “outflow” refer to a direction of fluid flow within a lumen, such as a body lumen, a blood vessel, or within a device.
It is noted that references in the specification to “an embodiment”, “some embodiments”, “other embodiments”, etc., indicate that the embodiment(s) described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it would be within the knowledge of one skilled in the art to effect such feature, structure, or characteristic in connection with other embodiments, whether or not explicitly described, unless clearly stated to the contrary. That is, the various individual elements described below, even if not explicitly shown in a particular combination, are nevertheless contemplated as being combinable or arrangable with each other to form other additional embodiments or to complement and/or enrich the described embodiment(s), as would be understood by one of ordinary skill in the art.
For the purpose of clarity, certain identifying numerical nomenclature (e.g., first, second, third, fourth, etc.) may be used throughout the description and/or claims to name and/or differentiate between various described and/or claimed features. It is to be understood that the numerical nomenclature is not intended to be limiting and is exemplary only. In some embodiments, alterations of and deviations from previously-used numerical nomenclature may be made in the interest of brevity and clarity. That is, a feature identified as a “first” element may later be referred to as a “second” element, a “third” element, etc. or may be omitted entirely, and/or a different feature may be referred to as the “first” element. The meaning and/or designation in each instance will be apparent to the skilled practitioner.
Diseases and/or medical conditions that impact the cardiovascular system are prevalent in the United States and throughout the world. Traditionally, treatment of the cardiovascular system was often conducted by directly accessing the impacted part of the system. For example, treatment of a blockage in one or more of the coronary arteries was traditionally treated using coronary artery bypass surgery. As can be readily appreciated, such therapies are rather invasive to the patient and require significant recovery times and/or treatments. More recently, less invasive therapies have been developed, for example, where a blocked coronary artery could be accessed and treated via a percutaneous catheter (e.g., angioplasty). Such therapies have gained wide acceptance among patients and clinicians.
Some relatively common medical conditions may include or be the result of inefficiency, ineffectiveness, or complete failure of one or more of the valves within the heart. For example, failure of the aortic valve or the mitral valve can have a serious effect on a human and could lead to serious health condition and/or death if not dealt with. Treatment of defective heart valves poses other challenges in that the treatment often requires the repair or outright replacement of the defective valve. Such therapies may be highly invasive to the patient. Disclosed herein are medical devices that may be used for delivering a medical device to a portion of the cardiovascular system in order to diagnose, treat, and/or repair the system. At least some of the medical devices disclosed herein may be used to deliver and implant a replacement heart valve (e.g., a replacement aortic valve, replacement mitral valve, etc.). In addition, the devices disclosed herein may deliver the replacement heart valve percutaneously and, thus, may be much less invasive to the patient. The devices disclosed herein may also provide a number of additional desirable features and benefits as described in more detail below.
The figures illustrate selected components and/or arrangements of a medical implant system 10, shown schematically in
The medical implant system 10, as seen in
In use, the medical implant system 10 may be advanced percutaneously through the vasculature to a position proximate to an area of interest and/or a treatment location. For example, in some embodiments, the medical implant system 10 may be advanced through the vasculature to a position proximate to a defective native valve (e.g., aortic valve, mitral valve, etc.). Alternative approaches to treat a defective aortic valve and/or other heart valve(s) are also contemplated with the medical implant system 10. During delivery, the medical implant 14 may be generally disposed in an elongated and low profile “delivery” configuration within the delivery system 12. Once positioned, at least a portion of the delivery system 12 may be retracted relative to the medical implant 14 to expose the medical implant 14. In some embodiments, the medical implant 14 may be disposed in an “everted” configuration while disposed within the lumen and/or the distal end of the delivery system 12 and/or immediately upon exposure after retracting the delivery system 12. In some embodiments, the “delivery” configuration and the “everted” configuration may be substantially similar and/or may be used interchangeably. The medical implant 14 may be actuated using the handle 18 in order to translate the medical implant 14 into a generally shortened and larger profile “deployed” configuration suitable for implantation within the anatomy, as seen in
In some embodiments, the delivery system 12 may include at least one lumen extending therethrough. For example, in some embodiments, the delivery system 12 may include a first lumen, a second lumen, a third lumen, and a fourth lumen. Other configurations are also contemplated. In general, the at least one lumen extend along an entire length of the delivery system 12. Other embodiments are contemplated, however, where at least one of the at least one lumen extends along only a portion of the length of the delivery system 12. In some embodiments, a coupler assembly 32 may be attached at and/or to a distal end of the delivery system 12. In some embodiments, the coupler assembly 32 may releasably couple the medical implant 14 and/or selected components thereof to the delivery system 12. In some embodiments, the coupler assembly 32 may include a plurality of fingers, as discussed in more detail below.
In some embodiments, disposed within one of the lumens of the delivery system 12 may be at least one actuator member 50, which may be used to actuate (e.g., translate axially or longitudinally, and/or expand) the medical implant 14 between a delivery configuration and a deployed configuration. In some embodiments, the medical implant system 10 may include at least one actuator member 50. In some embodiments, the at least one actuator member 50 may include a plurality of actuator members 50, two actuator members 50, three actuator members 50, four actuator members 50, or another suitable or desired number of actuator members 50. For the purpose of illustration only, the medical implant system 10 and/or the medical implant 14 of
It is to be noted that in order to facilitate understanding, certain features of the disclosure may be described in the singular, even though those features may be plural or recurring within the disclosed embodiment(s). Each instance of the features may include and/or be encompassed by the singular disclosure(s), unless expressly stated to the contrary. For example, a reference to “the actuator member”, “the locking element”, “the lumen”, or other features may be equally referred to all instances and quantities beyond one of said feature. As such, it will be understood that the following discussion may apply equally to any and/or all of the components for which there are more than one within the medical implant 14 (e.g., the at least one actuator member 50, the plurality of locking elements, etc.) and/or the medical implant system 10, unless explicitly stated to the contrary. Additionally, not all instances of some elements or features may be shown in each figure for clarity.
In some embodiments, the tubular anchor member 40 may include and/or form a plurality of anchor member intersection points 42 distributed around a circumference of the tubular anchor member 40. In some embodiments, the plurality of anchor member intersection points 42 may include two or more overlapping segments (e.g., a first segment, a second segment, a third segment, etc.) of the tubular anchor member 40 and/or the braid, filaments, wires, etc. thereof. In some embodiments, the two or more overlapping segments may be arranged in an alternating over-and-under pattern or arrangement. For example, at a first anchor member intersection point 42, a first segment may be disposed radially outward of a second segment. At an adjacent second anchor member intersection point 42 including the first segment, the first segment may be disposed radially inward of an overlapping segment (e.g., a third segment). If the first segment (or any single segment) is followed around the circumference of the tubular anchor member 40, the over-under-over pattern would continue alternating about the entire circumference of the tubular anchor member 40.
In some embodiments, the medical implant 14 may include a plurality of locking mechanisms attached to the tubular anchor member 40, the plurality of locking mechanisms being configured to secure the tubular anchor member 40 in the “deployed” and/or “released” configuration(s). In some embodiments, the medical implant 14 and/or the tubular anchor member 40 may be reversed and/or longitudinally extended back toward the “delivery” configuration at any point up until the plurality of locking mechanisms actually “locks” the medical implant 14 and/or the tubular anchor member in the “deployed” configuration. In some embodiments, the at least one actuator member 50 may be configured to engage with the plurality of locking mechanisms and actuate the tubular anchor member 40 and/or the medical implant 14 between the “delivery” configuration, the “deployed” configuration, and/or the “released” configuration. In some embodiments, one actuator member 50 may correspond to, engage with, and/or actuate one locking mechanism. In some embodiments, each actuator member 50 may extend through a guide 38 adjacent to and covering one of the plurality of fingers, as described herein, of the coupler assembly 32, and through a collar 36 coupling and/or locking the finger to one of the plurality of locking mechanisms. The guide 38 may be disposed over each of the fingers proximal of the collar 36 and may serve to keep the fingers of the coupler assembly 32 associated with the actuator members 50 extending adjacent to (and axially slidable relative to) the fingers of the coupler assembly 32. Other configurations are also contemplated. For example, in some embodiments, one actuator member 50 may correspond to, engage with, and/or actuate more than one locking mechanism.
For simplicity and clarity purposes, not all elements of the disclosed invention are necessarily shown in each figure. In some illustrative examples, only one of the fingers of the coupler assembly 32, only one of the plurality of actuator members 50, only one of the post members 76, only one of the buckle members 58, only one of the collars 36, etc. are shown and discussed (the whole medical implant 14 and/or the tubular anchor member 40 may not be shown to facilitate understanding of the locking mechanisms and/or other elements). However, it will be understood that the following discussion may apply equally to any and/or all of the components for which there are more than one within the medical implant 14 (e.g., each of the plurality of fingers 34, collars 36, guides 38, actuator members 50, buckle members 58, post members 76, etc.) and/or the medical implant system 10.
In some embodiments, the plurality of locking mechanisms may each comprise a buckle member 58 or other receiving element fixedly attached to the tubular anchor member 40 (e.g., along an inner surface of the tubular anchor member 40), and an axially movable post member 76, for example at the commissure portions of the valve leaflets 16 (a post member 76 may sometimes be referred to as a “commissure post”, which may serve to secure the plurality of valve leaflets 16, or a post member 76 may be connected and/or attached to a commissure post). In some embodiments, the buckle member 58 or other receiving element may be configured to slidably receive at least a portion of the post member 76 therein to engage with the buckle member 58 and thereafter lock the tubular anchor member 40 and/or the medical implant 14 in the “deployed” and/or the “released” configuration(s). In some embodiments, each of the plurality of valve leaflets 16 may be secured to the tubular anchor member 40 at one post member 76. In some embodiments, each of the plurality of valve leaflets 16 may be secured to two adjacent post members 76 at opposing sides of the valve leaflet 16. In at least some embodiments, a medical implant 14 may include a plurality of post members 76 and a corresponding plurality of buckle members 58 (e.g., one post member 76 for each/one buckle member 58). Other configurations and correspondences are also contemplated. Some suitable but non-limiting materials for the buckle member(s) 58 and/or the post member(s) 76, for example metallic materials or polymeric materials, may be described below.
Positioned proximate to (e.g., aligned with) the plurality of post members 76 may be a corresponding plurality of buckle members 58, which may be secured and/or fixedly attached to the tubular anchor member 40 (e.g., along the interior of the tubular anchor member 40) with sutures, adhesives, or other suitable mechanisms. In some embodiments, the post member 76 may be axially translatable relative to the buckle member 58 generally parallel to the central longitudinal axis of the tubular anchor member 40 when the post member 76 is at least partially disposed within and/or engaged with the buckle member 58.
In some embodiments, one buckle member 58 may be fixedly attached to the tubular anchor member 40 proximate to each of the three post members 76 and/or proximate the proximal end of the tubular anchor member 40. Accordingly, in some embodiments, the tubular anchor member 40 may have a total of three buckle members 58 and three post members 76 attached thereto. Similarly, one actuator member 50 may be associated with each post member 76 and buckle member 58, for a total of three actuator members 50 in the illustrated example(s). Other embodiments are contemplated where fewer or more buckle members 58, post members 76, and/or actuator members 50 may be utilized.
In some embodiments, the medical implant 14 and/or the tubular anchor member may be attached, coupled, and/or connected to the delivery system 12 by a coupler assembly 32, as seen in
In some embodiments, the plurality of valve leaflets 16 may be secured to the tubular anchor member 40 at, proximate to, and/or using (at least in part) individual, corresponding post members 76. In some embodiments, the plurality of valve leaflets 16 may also be secured to the distal end of the tubular anchor member 40. In at least some embodiments, the distal end of the tubular anchor member 40 may be interchangeably described as the “inflow” end or the “upstream” end of the tubular anchor member 40 and/or the medical implant 14. In at least some embodiments, the proximal end of the tubular anchor member 40 may be interchangeably described as the “outflow” end or the “downstream” end of the tubular anchor member 40 and/or the medical implant 14.
As will be described in more detail below, the post member 76 may be secured, attached, coupled, and/or connected to the distal end and/or the inflow end of the tubular anchor member 40. Therefore, in some embodiments, when the post member 76 is pulled proximally to engage the buckle member 58, as will be described herein, the distal end and/or the inflow end of the tubular anchor member 40 is also pulled proximally relative to the buckle member 58, thereby transitioning from the “delivery” configuration and/or the “everted” configuration toward the “deployed” configuration. In some embodiments, the plurality of valve leaflets 16 may be coupled and/or secured (e.g., to the post member 76, to the tubular anchor member 40, and/or back to themselves) using at least one suture, thread, wire, filament, or other suitable element. In some embodiments, the plurality of valve leaflets 16 may be coupled and/or secured (e.g., to the post member 76, to the tubular anchor member 40, and/or back to themselves) using an adhesive, a bonding agent, or other suitable securing means. In some embodiments, the plurality of valve leaflets 16 may be coupled and/or secured (e.g., to the post member 76, to the tubular anchor member 40, and/or back to themselves) using a fabric strip, a textile, or other thin flexible material. In some embodiments, the plurality of valve leaflets 16 may not be directly attached to the tubular anchor member 40.
In some embodiments, a seal member 44 may be circumferentially disposed on and/or about a distal portion and/or an inflow portion of the tubular anchor member 40, as seen in
In some embodiments, the seal member 44 may include a plurality of layers of polymeric material. Some suitable polymeric materials may include, but are not necessarily limited to, polycarbonate, polyurethane, polyamide, polyether block amide, polyethylene, polyethylene terephthalate, polypropylene, polyvinylchloride, polytetrafluoroethylene, polysulfone, and copolymers, blends, mixtures or combinations thereof. Other configurations and/or other suitable materials are also contemplated.
In some embodiments, the modulus of elasticity may vary and/or be different from layer to layer. In other embodiments, the elongation to break may vary and/or be different from layer to layer. In some embodiments, the seal member 44 may also include a reinforcement, a reinforcing layer, and/or at least one reinforcing member added to the polymeric material prior to curing. The reinforcement, the reinforcing layer, and/or the at least one reinforcing member may comprise a woven or nonwoven fabric and may be positioned within or between the various layers. In some embodiments, the reinforcement, the reinforcing layer, and/or the at least one reinforcing member may be positioned on a radially innermost surface or radially outermost surface of the seal member 44. In some embodiments, the reinforcement, the reinforcing layer, and/or the at least one reinforcing member may be generally aligned. In some embodiments, the reinforcement, the reinforcing layer, and/or the at least one reinforcing member may be randomly oriented and/or disposed on the seal member 44.
In some embodiments, a distal end of the seal member 44 may include a reinforcing band fixedly attached to the seal member 44 at and/or proximate the distal end and/or the inflow end of the tubular anchor member 40. In some embodiments, the reinforcing band may be integrally formed with, incorporated into, adhered to, and/or at least partially embedded within the seal member 44. In some embodiments, the reinforcing band may be formed from a woven or nonwoven fabric strip, a textile, or other thin flexible material. The reinforcing band may provide tear resistance in the vicinity of sutures, filaments, or other attachment elements associated with components or aspects of the medical implant 14. In some embodiments, the seal member 44 and/or the reinforcing band may extend longitudinally beyond the distal end and/or the inflow end of the tubular anchor member 40.
In some embodiments, the plurality of valve leaflets 16 may each define a secured end and a free end opposite the secured end, wherein the free ends of the plurality of valve leaflets 16 come together to define an outflow end of a valve disposed within the tubular anchor member 40 in the “deployed” configuration. In some embodiments, the secured end of each of the plurality of valve leaflets 16 may be directly attached to the seal member 44 and/or the reinforcing band at and/or proximate the distal end and/or the inflow end of the tubular anchor member 40. In some embodiments, the plurality of valve leaflets 16 may not be attached directly to the distal end and/or the inflow end of the tubular anchor member 40. In some embodiments, the plurality of valve leaflets 16 may be configured to shift between a deployed position wherein the outflow end of the valve is disposed within the tubular anchor member 40, and an everted position wherein the outflow end of the valve is disposed outside of, distal of, and/or upstream of the tubular anchor member 40.
As shown in
In some embodiments, the two axially-extending side walls may include a first side wall and a second side wall. In some embodiments, each side wall may include a proximal upper flange 57 and a distal upper flange 59 spaced longitudinally apart from the proximal upper flange 57, the proximal upper flange 57 and the distal upper flange 59 each extending from a top of the side wall distant from the back wall, the proximal upper flange 57 and the distal upper flange 59 each extending inwardly toward a central plane through the buckle member 58 (and/or the central longitudinal axis) normal to the back wall and/or the generally planar inner surface. In at least some embodiments, the proximal upper flange 57 and the distal upper flange 59 each may be oriented generally parallel to the back wall and/or the generally planar inner surface of the back wall. In some embodiments, the distal upper flange(s) 59 may define a proximal locking face configured to engage a latch portion extending laterally from the post member 76, as described herein.
In some embodiments, the back wall may extend between the two side walls, such that the two side walls, the back wall, and/or the proximal upper flange(s) 57 and the distal upper flange(s) 59 define a channel extending axially through the buckle member 58. In some embodiments, the buckle member 58 and/or the channel may include a suitable shape and/or keying feature(s) configured to cooperate with the actuator member 50 and/or the post member 76 to prevent relative rotation between the actuator member 50 and/or the post member 76 and the buckle member 58. In some embodiments, the back wall may include at least one aperture disposed within the back wall and between the two side walls. In some embodiments, a fastening element (e.g., a suture, thread, wire, filament, etc.) may pass through the at least one aperture and secure the buckle member 58 to the tubular anchor member 40. In some embodiments, the back wall may include a recessed portion in communication with some or all of the at least one aperture of the buckle member 58.
In some embodiments, the buckle member 58 may be substantially rigid. In some embodiments, the buckle member 58 may be formed from a metallic material, a polymeric material, a ceramic material, a composite material, or other suitable materials or combinations thereof. In some embodiments, the buckle member 58 may be partially rigid and/or partially flexible. In some embodiments, a buckle member 58 may permit an actuator member 50 and/or a post member 76 to be slidably received within and/or axially translate through the channel. In some embodiments, the buckle member 58 may be configured to prevent the actuator member 50 and/or the post member 76 from exiting the buckle member 58 in a radially inward direction toward the central longitudinal axis of the tubular anchor member 40, thereby limiting motion of the actuator member 50 and/or the post member 76 within the tubular anchor member 40 to axial translation.
As seen in
In some embodiments, the post member 76 may include a latch portion 80 connected to and/or integrally formed with or as a part of the central body portion. In some embodiments, the central body portion may be a laterally-arched central body portion extending laterally away from the first plane to form the latch portion 80. In some embodiments, the latch portion 80 may be resilient and/or self-biased away from the first plane. In some embodiments, the latch portion 80 may be configured to be deflected by the buckle member 58 and/or the distal upper flange(s) 59 as the post member 76 is translated proximally through the buckle member 58 and/or past the distal upper flange(s) 59.
In some embodiments, the post member 76 (in association and/or cooperation with axial translation of the actuator member 50) may be reversibly actuatable between a first orientation, wherein the proximal end extends distally from the central body portion (e.g., in the “delivery” and/or “everted” configuration), and a second orientation, wherein the proximal end extends proximally from the central body portion. In some embodiments, the post member 76 may be positioned and/or oriented in the second orientation in at least one configuration, including but not limited to, the “deployed” and/or “released” configurations. In some embodiments, the post member 76 may be axially translatable relative to the buckle member 58 and/or the tubular anchor member 40.
In some embodiments, the post member 76 may include a cantilevered leg 84 connected by a flexible hinge portion 82 at the distal end of the post member 76. In some embodiments, the cantilevered leg 84 may extend proximally from the hinge portion 82 and/or the distal end to a free end of the cantilevered leg 84 disposed radially inward from the central body portion and/or the latch portion 80 (relative to the tubular anchor member 40), when the post member 76 is in the second orientation. In some embodiments, the free end may be disposed proximal of the latch portion 80 when the post member 76 is in the second orientation. In some embodiments, the latch portion 80 may be disposed proximal of the distal end and/or the hinge portion 82 when the post member 76 is in the second orientation. In some embodiments, the cantilevered leg 84 may extend distally from the hinge portion 82 and/or the distal end to the free end of the cantilevered leg 84 disposed radially outward from the central body portion and/or the latch portion 80 (relative to the tubular anchor member 40), when the post member 76 is in the first orientation. In some embodiments, the free end may be disposed distal of the latch portion 80 when the post member 76 is in the first orientation. In some embodiments, the latch portion 80 may be disposed distal of the distal end and/or the hinge portion 82 when the post member 76 is in the first orientation.
In some embodiments, the hinge portion 82 may have and/or include a radius of curvature. For example, in some embodiments, the radius of curvature may be between 0 and 3 millimeters (mm). In some embodiments, the radius of curvature may be an inner radius of curvature of between 0 and 3 millimeters (mm). In some embodiments, the radius of curvature may be an outer radius of curvature of between 0 and 3 millimeters (mm). Other configurations and radii of curvature are also contemplated. In some embodiments, the hinge portion 82 may be configured to dispose the central body portion and the cantilevered leg 84 at an acute angle relative to each other. In some embodiments, the acute angle may be between about 0 degrees and about 90 degrees, between about 3 degrees and about 60 degrees, between about 5 degrees and about 45 degrees, between about 8 degrees and about 30 degrees, between about 10 degrees and about 20 degrees, between about 12 degrees and about 16 degrees, about 14 degrees, or another suitable angle. In at least some embodiments, the hinge portion 82 flexibly attaches the cantilevered leg 84 to the central body portion of the post member 76. In some embodiments, at least part of the cantilevered leg 84 may longitudinally overlap the buckle member 58 along a central longitudinal axis of the tubular anchor member 40 in the “deployed” configuration.
In some embodiments, the cantilevered leg 84 may include a free end and a secured end, where the cantilevered leg 84 may be attached to the central body portion and/or the distal end of the post member 76 at the secured end of the cantilevered leg 84, which may connect directly to the hinge portion 82. In some embodiments, the free end of the cantilevered leg 84 may be unattached (e.g., not directly attached) to any other structure of the medical implant 14, except for the cantilevered leg 84 and/or the plurality of valve leaflets 16. In other words, in some embodiments, the free end of the cantilevered leg 84 may not be directly attached to any other structure or feature of the medical implant 14 (e.g., the buckle member 58, the tubular anchor member 40, etc.). In some embodiments, the distal end of the post member 76, which in at least some embodiments may be proximate to and/or include the hinge portion 82, may be coupled to the distal end of the tubular anchor member 40, such as, for example, by a fastening element such as a suture, a filament, a wire, or other suitable means, as described herein. In some embodiments, the central body portion may include at least one aperture or hole 86 configured to receive a coupling element therethrough for securing the post member 76 to a distal end of the tubular anchor member 40, such as the suture, for example. As such, when the post member 76 is pulled proximally to engage the buckle member 58, the distal end of the tubular anchor member 40 is also pulled proximally relative to the buckle member 58, thereby transitioning from the “delivery” configuration toward the “deployed” configuration.
In some embodiments, the cantilevered leg(s) 84 may include a first longitudinally-oriented slot 85 extending therethrough between the secured end of the cantilevered leg 84 and the free end of the cantilevered leg 84. In at least some embodiments, at least one of the plurality of valve leaflets 16 may be coupled to and/or attached to the cantilevered leg(s) 84. In some embodiments, at least one of the plurality of valve leaflets 16 extend through the first longitudinally-oriented slot 85 of the cantilevered leg(s) 84. In some embodiments, attachment of the plurality of valve leaflets 16 to the cantilevered leg(s) 84 may provide flexibility and/or a reduction in stress between the plurality of valve leaflets 16 and the tubular anchor member 40. In some embodiments, at least a portion of the plurality of valve leaflets 16 may axially or longitudinally overlap at least a portion of the buckle members 58 at a common position along a central longitudinal axis of the tubular anchor member 40, which in some embodiments may allow for a shorter overall length or height of the medical implant 14. In some embodiments, the plurality of valve leaflets 16 may be secured directly to the cantilevered leg(s) 84. In some embodiments, the plurality of valve leaflets 16 may not be directly secured to the central body portion of the post member 76, but is instead coupled to the post member 76 via the cantilevered leg(s) 84. In some embodiments, the plurality of valve leaflets 16 may be wrapped around at least a portion of the cantilevered leg(s) 84. In some embodiments, a distalmost end of the plurality of valve leaflets 16 may be coupled to the distal end of the tubular anchor member 40. In some embodiments, the plurality of valve leaflets 16 may be coupled and/or secured (e.g., to the cantilevered leg 84, to the tubular anchor member 40, and/or back to themselves) using at least one suture, thread, wire, filament, or other suitable element. In some embodiments, the plurality of valve leaflets 16 may be coupled and/or secured (e.g., to the cantilevered leg 84, to the tubular anchor member 40, and/or back to themselves) using an adhesive, a bonding agent, or other suitable securing means. In some embodiments, the plurality of valve leaflets 16 may be coupled and/or secured (e.g., to the cantilevered leg 84, to the tubular anchor member 40, and/or back to themselves) using a fabric, a textile, or other thin flexible material.
In some embodiments, the post member 76 may include a receiving portion 88 proximate the proximal end. In some embodiments, the receiving portion 88 may include a first portion 81 and a second portion 83, each extending proximally from the central body portion and/or the latch portion 80 when the post member 76 is in the second orientation. In some embodiments, the first portion 81 and the second portion 83 may be spaced apart by a second longitudinally-oriented slot 87 disposed therebetween. In some embodiments, the second longitudinally-oriented slot 87 may narrow distally when the post member 76 is in the second orientation. In some embodiments, each of the first portion 81 and the second portion 83 may include an aperture 89 extending into and/or from the second longitudinally-oriented slot 87 such that the aperture 89 of each respective portion is in communication with the second longitudinally-oriented slot 87. In some embodiments, the aperture 89 of the first portion 81 and/or the aperture 89 of the second portion 83 may extend partially through its respective portion in a radial (with respect to the central longitudinal axis and/or the tubular anchor member 40) direction. In some embodiments, the aperture 89 of the first portion 81 and/or the aperture 89 of the second portion 83 may extend completely through its respective portion in a radial (with respect to the central longitudinal axis and/or the tubular anchor member 40) direction. In some embodiments, the first portion 81 and the second portion 83 may be configured to releasably engage the actuator member 50, thereby releasably connecting the actuator member 50 to the proximal end of the post member 76. In some embodiments, as the actuator member 50 and/or the post member 76 is translated proximally through the buckle member 58 in the second orientation, the second longitudinally-oriented slot 87 of the post member 76 may contact and/or engage a distal end of the finger of the coupler assembly 32. In some embodiments, the distal end of the finger may be configured to splay apart the first portion 81 and the second portion 83 by forcing the first portion 81 radially inward toward the central longitudinal axis relative to, and/or away from, the second portion 83 as the post member 76 is translated proximally when the first portion 81 contacts the finger, as seen in
In some embodiments, the latch portion 80 may be configured to engage the proximal locking face of the distal upper flange(s) 59 of the buckle member 58 when the post member 76 is in the second orientation, such that axial movement of the post member 76 distally relative to the buckle member 58 is prevented when the medical implant 14 and/or the tubular anchor member 40 is in the “deployed” configuration and/or the “released” configuration. In some embodiments, the latch portion 80 may include a transversely-oriented tooth extending laterally (or radially relative to the central longitudinal axis) therefrom and/or extends toward the cantilevered leg 84, wherein the tooth is configured to engage with the proximal locking face of the distal upper flange(s) 59 when the post member 76 is in the second orientation and/or the tubular anchor member 40 is in the “deployed” configuration and/or the “released” configuration. In some embodiments, the central body portion arches laterally (or radially relative to the central longitudinal axis) in a first direction relative to the proximal end and the distal end of the post member 76 (e.g., relative to the first plane), and the latch portion 80 and/or the tooth extends laterally (or radially relative to the central longitudinal axis) in the first direction from the central body portion.
In some embodiments, at least a portion of the post member 76 is flexible. In some embodiments, the latch portion 80 and/or the tooth may be movable relative to the central body portion. In some embodiments, the latch portion 80 may be deflectable relative to the central body portion such that the latch portion 80 and/or the tooth may translate laterally relative to the central body portion and/or radially outward relative to the central longitudinal axis. In some embodiments, the central body portion and/or the latch portion 80 may be configured to flex towards the first plane and/or a substantially straight configuration (e.g., radially relative to the central longitudinal axis) upon proximal translation of the post member 76 through the buckle member 58. In some embodiments, the free end of the cantilevered leg 84 may be movable toward and away from the central body portion (e.g., radially relative to the central longitudinal axis) by bending and/or pivoting the cantilevered leg 84 at and/or using the hinge portion 82.
In some embodiments, the central body portion may be unitary with and/or integrally formed with the latch portion 80, the hinge portion 82, the cantilevered leg 84, the receiving portion 88, and/or the first portion 81 and the second portion 83, of the post member 76 as and/or from a single piece of material. In some embodiments, the post member 76 may be formed from a single piece of wire, flat stock, or other suitable material as discussed herein. In some embodiments, the post member 76 may be formed by further processing the single piece of wire, flat stock, or other suitable material, such as by machining, stamping, laser cutting, or other suitable techniques.
In some embodiments, an example actuator member 50, as seen in
In some embodiments, the distal engagement portion 56 may include a lateral protrusion 60 proximate a distal end thereof. In some embodiments, the distal engagement portion 56 may include more than one lateral protrusion 60 proximate a distal end thereof. In some embodiments, the lateral protrusion 60 may be configured to matingly engage with the receiving portion 88, the aperture 89 of the first portion 81, and/or the aperture 89 of the second portion 83 of the post member 76. In some embodiments, the actuator member 50 may be prevented from rotating (e.g., is non-rotatable) relative to the post member 76 when the distal engagement portion 56 and/or the lateral protrusion 60 of the actuator member 50 is engaged with the receiving portion 88, the aperture 89 of the first portion 81, and/or the aperture 89 of the second portion 83 of the post member 76. In some embodiments, the actuator member 50 may be prevented from rotating (e.g., is non-rotatable) relative to the buckle member 58 when the distal engagement portion 56 and/or the lateral protrusion 60 of the actuator member 50 is engaged with the receiving portion 88, the aperture 89 of the first portion 81, and/or the aperture 89 of the second portion 83 of the post member 76, and/or when the post member 76 is engaged with the buckle member 58.
In use, the proximal end of the actuator member 50 may be connected to and/or manipulated or otherwise actuated by a user, for example using the handle 18, to shift the medical implant 14 from a “delivery” configuration and/or an “everted” configuration to a “deployed” configuration, and later to a “released” configuration. In some embodiments, the actuator member 50 may be axially translatable relative to the buckle member 58. In some embodiments, the actuator member 50 may extend through the channel of the buckle member 58 when the tubular anchor member 40 is in the “delivery” configuration and/or the “everted” configuration. In some embodiments, the actuator member 50 may extend distally of the tubular anchor member 40 in the “delivery” configuration and/or the “everted” configuration. In some embodiments, the actuator member 50 may be axially translatable within and/or through the channel of the buckle member 58 to engage the post member 76 with the buckle member 58.
In some embodiments, the actuator member 50 may be aligned with the post member 76 and/or the lateral protrusion(s) 60 may be releasably engaged with and/or connected to the proximal end of the post member 76 and/or the receiving portion 88, the aperture 89 of the first portion 81, and/or the aperture 89 of the second portion 83 of the post member 76. In some embodiments, the distal engagement portion 56 may be received within the second longitudinally-oriented slot 87 disposed between the first portion 81 and the second portion 83 of the post member 76. In some embodiments, the lateral protrusion(s) 60 may be configured to engage with, be received by, and/or extend into the aperture(s) 89 formed within each of the first portion 81 and the second portion 83 of the post member 76.
In some embodiments, the actuator member 50 and/or the proximal shaft portion 52 may be generally round, oblong, ovoid, rectangular, polygonal (e.g., two-sided, three-sided, four-sided, five-sided, six-sided, etc.) in shape. Other shapes, both regular and irregular, are also contemplated. For example, in some embodiments, the proximal shaft portion 52 may include a flattened portion or side oriented radially inward toward the central longitudinal axis. In some embodiments, the actuator member 50 may be formed from a single piece of wire, round stock, or other suitable material, as discussed herein. In some embodiments, the actuator member 50 may be formed by further processing the single piece of wire, round stock, or other suitable material, such as by machining, stamping, laser cutting, or other suitable techniques. Some suitable but non-limiting materials for the actuator member 50, the proximal shaft portion 52, the distal engagement portion 56, and/or the hinge element 54, for example metallic materials or polymeric materials, may be described below.
During delivery, after the medical implant 14 is advanced within the anatomy to the desired and/or target location, at least a portion of the delivery system 12 may be withdrawn (e.g., moved proximally relative to the medical implant 14) to expose the medical implant 14 in the “delivery” configuration and/or the “everted” configuration.
In some embodiments, a distal end of the axially movable post member 76 may be secured and/or attached (e.g., fixedly attached, movably attached, removably attached, etc.) to a distal portion of the tubular anchor member 40, such as by a suture 74, a tether, adhesives, or other suitable element. In some embodiments, the commissure post and/or the post member 76 may include at least one hole 86 (as seen in
In some embodiments, the post member 76 may be movable relative to the tubular anchor member 40 and/or the buckle member 58. In some embodiments, the post member 76 may be axially or longitudinally movable relative to the tubular anchor member 40 and/or the buckle member 58. In some embodiments, the buckle member 58 may be fixedly attached to the tubular anchor member 40 at and/or proximate the proximal end thereof. Other embodiments are contemplated where the buckle member 58 may be movably or removably attached to the tubular anchor member 40. In some embodiments, the post member 76 may be movably or removably attached to the tubular anchor member 40 and the buckle member 58 may be movably or removably attached to the tubular anchor member 40. In some embodiments, the post member 76 may be secured or attached (e.g., fixedly attached, movably attached, removably attached, etc.) to a distal end of the tubular anchor member 40.
As seen in
Turning now to
As seen in
Simultaneously with and/or immediately before splaying apart the receiving portion 88, and/or the first portion 81 and the second portion 83, of the post member 76 and/or disengagement of the distal engagement portion 56 and/or the lateral protrusion(s) 60 of the actuator member 50 from the aperture(s) 89 in the receiving portion 88, and/or the aperture 89 in the first portion 81 and the aperture 89 in the second portion 83, of the post member 76, a proximal face along a top or radially-inward facing side of the proximal shaft portion 52 of the actuator member 50 proximate to and/or proximal of the hinge element 54 may contact the collar 36, thereby proximally retracting the collar 36 along with the actuator member 50 to expose the finger 34 where it engages with the proximal end of the buckle member 58.
In some embodiments, after disengaging the distal engagement portion 56 and/or the lateral protrusion(s) 60 of the actuator member 50 from the aperture(s) 89 in the receiving portion 88, and/or the aperture 89 in the first portion 81 and the aperture 89 in the second portion 83, of the post member 76, the medical implant 14 and/or the tubular anchor member 40 may experience a minor or slight “spring-back” toward the “delivery” configuration. Additionally, since the collar 36 is no longer maintaining the finger 34 and the buckle member 58 in a coupled relationship or configuration, the finger(s) 34 and/or the coupler assembly 32 may separate from the medical implant 14, the buckle member(s) 58, and/or the tubular anchor member 40. As noted above, the latch portion 80 and/or the tooth may contact the proximally facing surface of the distal upper flange(s) 59, preventing the medical implant 14 and/or the tubular anchor member 40 from actuating further toward the “delivery” configuration. Upon separation and/or disengagement of the coupler assembly 32 from the medical implant 14, the medical implant 14 and/or the tubular anchor member 40 may be left in the “released” configuration, as seen in
The materials that can be used for the various components of the medical implant system 10 (and/or other systems disclosed herein) and the various elements thereof disclosed herein may include those commonly associated with medical devices. For simplicity purposes, the following discussion makes reference to the delivery system 12 and/or the medical implant 14. However, this is not intended to limit the devices and methods described herein, as the discussion may be applied to other elements, members, components, or devices disclosed herein, such as, but not limited to, the tubular anchor member 40, the actuator member 50, the locking mechanism, the post member 76, the buckle member 58, and/or elements or components thereof.
In some embodiments, the delivery system 12 and/or the medical implant 14, and/or components thereof (such as, but not limited to, the tubular anchor member 40, the locking mechanisms, the actuator members 50, etc.), may be made from a metal, metal alloy, polymer (some examples of which are disclosed below), a metal-polymer composite, ceramics, combinations thereof, and the like, or other suitable material. Some examples of suitable metals and metal alloys include stainless steel, such as 444V, 444L, and 314LV stainless steel; mild steel; nickel-titanium alloy such as linear-elastic and/or super-elastic nitinol; other nickel alloys such as nickel-chromium-molybdenum alloys (e.g., UNS: N06625 such as INCONEL® 625, UNS: N06022 such as HASTELLOY® C-22®, UNS: N10276 such as HASTELLOY® C276®, other HASTELLOY® alloys, and the like), nickel-copper alloys (e.g., UNS: N04400 such as MONEL® 400, NICKELVAC® 400, NICORROS® 400, and the like), nickel-cobalt-chromium-molybdenum alloys (e.g., UNS: R44035 such as MP35-N® and the like), nickel-molybdenum alloys (e.g., UNS: N10665 such as HASTELLOY® ALLOY B2®), other nickel-chromium alloys, other nickel-molybdenum alloys, other nickel-cobalt alloys, other nickel-iron alloys, other nickel-copper alloys, other nickel-tungsten or tungsten alloys, and the like; cobalt-chromium alloys; cobalt-chromium-molybdenum alloys (e.g., UNS: R44003 such as ELGILOY®, PHYNOX®, and the like); platinum enriched stainless steel; titanium; combinations thereof; and the like; or any other suitable material.
As alluded to herein, within the family of commercially available nickel-titanium or nitinol alloys, is a category designated “linear elastic” or “non-super-elastic” which, although may be similar in chemistry to conventional shape memory and super elastic varieties, may exhibit distinct and useful mechanical properties. Linear elastic and/or non-super-elastic nitinol may be distinguished from super elastic nitinol in that the linear elastic and/or non-super-elastic nitinol does not display a substantial “superelastic plateau” or “flag region” in its stress/strain curve like super elastic nitinol does. Instead, in the linear elastic and/or non-super-elastic nitinol, as recoverable strain increases, the stress continues to increase in a substantially linear, or a somewhat, but not necessarily entirely linear relationship until plastic deformation begins or at least in a relationship that is more linear than the super elastic plateau and/or flag region that may be seen with super elastic nitinol. Thus, for the purposes of this disclosure linear elastic and/or non-super-elastic nitinol may also be termed “substantially” linear elastic and/or non-super-elastic nitinol.
In some cases, linear elastic and/or non-super-elastic nitinol may also be distinguishable from super elastic nitinol in that linear elastic and/or non-super-elastic nitinol may accept up to about 2-5% strain while remaining substantially elastic (e.g., before plastically deforming) whereas super elastic nitinol may accept up to about 8% strain before plastically deforming. Both of these materials can be distinguished from other linear elastic materials such as stainless steel (that can also be distinguished based on its composition), which may accept only about 0.2 to 0.44 percent strain before plastically deforming.
In some embodiments, the linear elastic and/or non-super-elastic nickel-titanium alloy is an alloy that does not show any martensite/austenite phase changes that are detectable by differential scanning calorimetry (DSC) and dynamic metal thermal analysis (DMTA) analysis over a large temperature range. For example, in some embodiments, there may be no martensite/austenite phase changes detectable by DSC and DMTA analysis in the range of about −60 degrees Celsius (° C.) to about 120° C. in the linear elastic and/or non-super-elastic nickel-titanium alloy. The mechanical bending properties of such material may therefore be generally inert to the effect of temperature over this very broad range of temperature. In some embodiments, the mechanical bending properties of the linear elastic and/or non-super-elastic nickel-titanium alloy at ambient or room temperature are substantially the same as the mechanical properties at body temperature, for example, in that they do not display a super-elastic plateau and/or flag region. In other words, across a broad temperature range, the linear elastic and/or non-super-elastic nickel-titanium alloy maintains its linear elastic and/or non-super-elastic characteristics and/or properties.
In some embodiments, the linear elastic and/or non-super-elastic nickel-titanium alloy may be in the range of about 50 to about 60 weight percent nickel, with the remainder being essentially titanium. In some embodiments, the composition is in the range of about 54 to about 57 weight percent nickel. One example of a suitable nickel-titanium alloy is FHP-NT alloy commercially available from Furukawa Techno Material Co. of Kanagawa, Japan. Other suitable materials may include ULTANIUM™ (available from Neo-Metrics) and GUM METAL™ (available from Toyota). In some other embodiments, a superelastic alloy, for example a superelastic nitinol can be used to achieve desired properties.
In at least some embodiments, portions or all of the delivery system 12 and/or the medical implant 14, and/or components thereof, may also be doped with, made of, or otherwise include a radiopaque material. Radiopaque materials are understood to be materials capable of producing a relatively bright image on a fluoroscopy screen or another imaging technique during a medical procedure. This relatively bright image aids a user in determining the location of the delivery system 12 and/or the medical implant 14. Some examples of radiopaque materials can include, but are not limited to, gold, platinum, palladium, tantalum, tungsten alloy, polymer material loaded with a radiopaque filler, and the like. Additionally, other radiopaque marker bands and/or coils may also be incorporated into the design of the delivery system 12 and/or the medical implant 14 to achieve the same result.
In some embodiments, a degree of Magnetic Resonance Imaging (MRI) compatibility is imparted into the medical implant 14. For example, the delivery system 12 and/or the medical implant 14, and/or components or portions thereof, may be made of a material that does not substantially distort the image and create substantial artifacts (e.g., gaps in the image). Certain ferromagnetic materials, for example, may not be suitable because they may create artifacts in an MRI image. The delivery system 12 and/or the medical implant 14, or portions thereof, may also be made from a material that the MRI machine can image. Some materials that exhibit these characteristics include, for example, tungsten, cobalt-chromium-molybdenum alloys (e.g., UNS: R44003 such as ELGILOY®, PHYNOX®, and the like), nickel-cobalt-chromium-molybdenum alloys (e.g., UNS: R44035 such as MP35-N® and the like), nitinol, and the like, and others.
In some embodiments, a sheath or covering (not shown) may be disposed over portions or all of the delivery system 12 and/or the medical implant 14. The sheath may be made from a polymer or other suitable material. Some examples of suitable polymers may include polytetrafluoroethylene (PTFE), ethylene tetrafluoroethylene (ETFE), fluorinated ethylene propylene (FEP), polyoxymethylene (POM, for example, DELRIN® available from DuPont), polyether block ester, polyurethane (for example, Polyurethane 85A), polypropylene (PP), polyvinylchloride (PVC), polyether-ester (for example, ARNITEL® available from DSM Engineering Plastics), ether or ester based copolymers (for example, butylene/poly(alkylene ether) phthalate and/or other polyester elastomers such as HYTREL® available from DuPont), polyamide (for example, DURETHAN® available from Bayer or CRISTAMID® available from Elf Atochem), elastomeric polyamides, block polyamide/ethers, polyether block amide (PEBA, for example available under the trade name PEBAX®), ethylene vinyl acetate copolymers (EVA), silicones, polyethylene (PE), Marlex high-density polyethylene, Marlex low-density polyethylene, linear low density polyethylene (for example REXELL®), polyester, polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polytrimethylene terephthalate, polyethylene naphthalate (PEN), polyetheretherketone (PEEK), polyimide (PI), polyetherimide (PEI), polyphenylene sulfide (PPS), polyphenylene oxide (PPO), poly paraphenylene terephthalamide (for example, KEVLAR®), polysulfone, nylon, nylon-12 (such as GRILAMID® available from EMS American Grilon), perfluoro(propyl vinyl ether) (PFA), ethylene vinyl alcohol, polyolefin, polystyrene, epoxy, polyvinylidene chloride (PVdC), poly(styrene-b-isobutylene-b-styrene) (for example, SIBS and/or SIBS 50A), polycarbonates, ionomers, biocompatible polymers, other suitable materials, or mixtures, combinations, copolymers thereof, polymer/metal composites, and the like. In some embodiments the sheath can be blended with a liquid crystal polymer (LCP). For example, the mixture can contain up to about 6 percent LCP.
It should be understood that this disclosure is, in many respects, only illustrative. Changes may be made in details, particularly in matters of shape, size, and arrangement of steps without exceeding the scope of the invention. This may include, to the extent that it is appropriate, the use of any of the features of one example embodiment being used in other embodiments. The invention's scope is, of course, defined in the language in which the appended claims are expressed.
This application claims priority to U.S. Provisional Application Ser. No. 62/336,944, filed May 16, 2016.
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