Stent Delivery System

Abstract

The stent delivery system includes a stent deployment sheath and an anti-snagging member that is positionable adjacent to a proximal end of the deployment sheath and is designed to allow the proximal end of the deployment sheath to pass through the stent without snagging on the stent.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority under 35 U.S.C. 119 to U.S. Provisional Patent Application Serial No. 62 / 790,336, filed on January 9, 2019, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present disclosure relates to medical devices and methods for making and using medical devices. More specifically, the present disclosure relates to stents, stent delivery systems, and methods for making and using such devices and systems. Background Art

[0004] A wide variety of in vivo medical devices have been developed for medical uses (e.g., intravascular uses, endoscopic uses, etc.). Some of these devices include expandable stents, delivery devices, and / or systems for expandable stents, etc. These devices and / or systems are manufactured by any of a variety of different manufacturing methods and can be used according to any of a variety of methods. With respect to known medical devices and methods, each has certain advantages and disadvantages. There is a continuing need to provide alternative medical devices and alternative methods for making and using medical devices. Summary of the invention

[0005] The present disclosure provides design, material, manufacturing method, and use alternatives for expandable stents and / or stent delivery systems.

[0006] An exemplary stent delivery system includes: an inner member having a distal region; a delivery sleeve arranged along the distal region of the inner member and defining a space between the inner member and the delivery sleeve, the delivery sleeve having a proximal end, the inner member and the delivery sleeve being designed to slide distally relative to the stent in the space between the inner member and the delivery sleeve to deliver the stent; and an intermediate member arranged along the inner member, the intermediate member including an anti-catch member, the intermediate member being movable relative to the delivery sleeve so that the anti-catch member can be located adjacent to the proximal end of the delivery sleeve and being designed to allow the proximal end of the delivery sleeve to pass through the stent without being caught on the stent.

[0007] Alternatively or in addition to the above embodiments, wherein the anti-snag member comprises a tapered outer surface.

[0008] Alternatively or in addition to any of the above embodiments, wherein the anti-snag member comprises a foldable member.

[0009] Alternatively or in addition to any of the above embodiments, wherein the anti-snagging member comprises a self-expanding member.

[0010] Alternatively or in addition to any of the above embodiments, wherein the anti-snag member comprises a tapered tubular member.

[0011] Alternatively or in addition to any of the above embodiments, wherein the tapered tubular member includes a proximal portion coupled to the intermediate member, and an expandable distal portion.

[0012] Alternatively or in addition to any of the above embodiments, wherein the expandable distal portion comprises a plurality of fingers.

[0013] Alternatively or in addition to any of the above embodiments, wherein the anti-snag member includes a distal portion having a first outer diameter, and a proximal portion having a second outer diameter, and the first outer diameter is greater than the second outer diameter.

[0014] Alternatively or in addition to any of the above embodiments, wherein the deployment cannula comprises an inner diameter, and wherein the first outer diameter of the anti-snag member is proximate to the inner diameter of the deployment cannula.

[0015] Alternatively or in addition to any of the above embodiments, wherein the delivery cannula includes an inner surface and the anti-snagging member includes an outer surface that engages the inner surface of the delivery cannula.

[0016] Alternatively or in addition to any of the above embodiments, wherein the anti-snag member comprises a tapered outer surface of a portion of the intermediate member.

[0017] Alternatively or in addition to any of the above embodiments, the anti-catch member is movable relative to the delivery cannula such that the anti-catch member includes a first position wherein the anti-catch member is spaced from a proximal end of the delivery cannula, and a second position wherein the anti-catch member is located adjacent to the proximal end of the delivery cannula.

[0018] Alternatively or in addition to any of the above embodiments, the anti-catch member is movable relative to the delivery sleeve such that the anti-catch member includes a first position wherein the anti-catch member is disposed within the delivery sleeve distal to the proximal end of the delivery sleeve, and a second position wherein the anti-catch member is engaged with the delivery sleeve at or adjacent to the proximal end of the delivery sleeve.

[0019] Alternatively or in addition to any of the above embodiments, wherein the anti-catch member comprises a constrained configuration (wherein the anti-catch member is disposed inside the delivery sheath) and an expanded configuration (wherein at least a portion of the anti-catch member is disposed outside the delivery sheath).

[0020] Alternatively or in addition to any of the above embodiments, wherein the anti-snag member includes an inner surface designed to engage an outer surface of the delivery cannula.

[0021] Alternatively or in addition to any of the above embodiments, further comprising a self-expanding stent disposed in the space between the inner member and the delivery sheath.

[0022] Alternatively or in addition to any of the above embodiments, wherein the anti-snag member is disposed in a space between the inner member and the deployment sleeve.

[0023] An exemplary stent delivery system includes: an inner member having a distal region; a delivery sleeve connected to the inner member and arranged along the distal region of the inner member, the delivery sleeve having a proximal end; a stent arranged inside a space between the inner member and the delivery sleeve; an intermediate member arranged along the inner member and including an anti-catch member; the inner member and the delivery sleeve being designed to slide distally relative to the stent to deliver the stent; and the intermediate member including an anti-catch member, which is movable relative to the delivery sleeve so that the anti-catch member includes a first position (wherein the anti-catch member is spaced apart from the proximal end of the delivery sleeve) and a second position (wherein the anti-catch member is located adjacent to the proximal end of the delivery sleeve) and is designed to allow the proximal end of the delivery sleeve to pass through the stent without being caught on the stent.

[0024] Alternatively or in addition to any of the above embodiments, wherein when in the first position, the anti-snag member is disposed within the space between the inner member and the delivery sleeve, and when in the second position, at least a portion of the anti-snag member is disposed outside the delivery sleeve.

[0025] An exemplary method of deploying a stent includes delivering a stent delivery system into an anatomical structure of a patient, the stent delivery system including: an inner member having a distal region; a deployment sheath disposed along the distal region of the inner member, the deployment sheath having a proximal end; a stent disposed within a space between the inner member and the deployment sheath; and an intermediate member disposed along the inner member and including an anti-catch member. The method includes deploying the stent by sliding the inner member and the deployment sheath distally relative to the stent; moving the anti-catch member relative to the deployment sheath such that the anti-catch member is located adjacent to a proximal end of the deployment sheath; and passing the deployment sheath through the stent, wherein the anti-catch member is designed to allow the proximal end of the deployment sheath to pass through the stent without catching on the stent.

[0026] The above summary of some embodiments is not intended to describe each disclosed embodiment or every example of the present disclosure. These embodiments are more particularly exemplified in the following figures and detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present disclosure may be more fully understood based on the following detailed description taken in conjunction with the accompanying drawings, in which:

[0028] Figure 1 is a cross-sectional side view of a portion of an exemplary embodiment of a stent delivery system in a first configuration disposed within a vessel prior to deployment of the stent;

[0029] Figure 2 is shown in another configuration during stent deployment Figure 1 a cross-sectional side view of an exemplary embodiment of wherein the stent is partially deployed and wherein the anti-catch member is located within the deployment sleeve space and spaced from the proximal end of the deployment sleeve and / or distal to the proximal end of the deployment sleeve;

[0030] Figure 3 is shown in another configuration after stent deployment Figure 2 A partial cutaway perspective view of an exemplary embodiment of a device for delivering a stent having a plurality of stents and an anti-catch member located within a delivery sheath and spaced from a proximal end of the delivery sheath and / or distal to the proximal end of the delivery sheath, wherein the vessel, the stent, and the delivery sheath are shown in a cutaway side view, and the inner member and the intermediate member including the anti-catch member are shown in a non-cutaway side view;

[0031] Figure 4 is shown in another configuration after stent deployment Figure 3 a partial cutaway perspective view of an exemplary embodiment of wherein the intermediate member and the anti-catch member are moved proximally relative to the delivery sheath and the anti-catch member is in an expanded state, the vessel and stent are shown in a cutaway side view and the delivery system is shown in a non-cutaway side view;

[0032] Figure 5 is shown in another configuration Figure 4 a partial cross-sectional perspective view of an exemplary embodiment of wherein the intermediate member and the anti-catch member are distally moved relative to the delivery cannula such that the anti-catch member is positioned adjacent to the proximal end of the delivery cannula;

[0033] Figure 6 is a partial cross-sectional perspective view of a portion of another exemplary embodiment of a stent delivery system disposed within a vessel shown in a post-deployment configuration of the stent, and an anti-catch member is located within a deployment sheath spaced from a proximal end of the deployment sheath and / or distal to the proximal end of the deployment sheath, wherein the vessel, stent, and delivery sheath are shown in a cross-sectional side view, and an inner member and an intermediate member including the anti-catch member are shown in a non-cross-sectional view; and

[0034] Figure 7 is shown in another configuration Figure 600136] A partial cross-sectional perspective view of an exemplary embodiment of wherein the intermediate member and the anti-catch member are moved proximally relative to the deployment sleeve such that the anti-catch member is positioned adjacent to the proximal end of the deployment sleeve.

[0035] Although the present disclosure may have various modifications and alternative forms, the details thereof have been disclosed by way of example in the accompanying drawings and will be described in detail. However, it should be understood that it is not intended to limit the present invention to the specific embodiments described. On the contrary, it is intended to cover all modifications, equivalents, and substitutes that fall within the spirit and scope of the present disclosure. DETAILED DESCRIPTION

[0036] The following description should be read with reference to the accompanying drawings which are not necessarily drawn to scale, wherein similar reference numerals represent similar elements in all several views. The detailed drawings and the accompanying drawings are used to illustrate but not limit the invention claimed for protection. 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 present disclosure. The detailed description and the accompanying drawings illustrate exemplary embodiments of the invention claimed for protection. However, for clarity and ease of understanding, although each feature and / or element may not be shown in each of the accompanying drawings, these features and / or elements may be understood to exist unless otherwise stated.

[0037] For the following defined terms, these definitions shall apply, unless a different definition is given in the claims or elsewhere in this specification.

[0038] All numerical values ​​herein are modified by the term "about", whether or not explicitly stated. The term "about" generally refers to a series of numbers that one skilled in the art would consider equivalent to the listed values ​​(e.g., having the same function or result). In many cases, the term "about" may include numbers rounded to the nearest significant figure. Other uses of the term "about" (e.g., in contexts other than numerical values) may be assumed to have their ordinary and usual definitions, as understood from the context of and consistent with the context of this specification, unless otherwise stated.

[0039] The recitation of numerical ranges by endpoints includes all numbers within that range (eg, 1 to 5 includes 1, 1.5, 2, 2.75, 3, 3.80, 4, and 5).

[0040] Although some suitable sizes, ranges, and / or values ​​pertaining to various components, features and / or specifications are disclosed, those skilled in the art, in light of this disclosure, will appreciate that the desired sizes, ranges, and / or values ​​may deviate from the explicitly disclosed sizes, ranges, and / or values.

[0041] As used in this specification and the appended claims, the singular forms "a", "an", and "the" include plural referents unless the context clearly indicates otherwise. The term "or" as used in this specification and the appended claims is generally used with its meaning including "and / or", unless the context clearly dictates otherwise. It should be noted that, for ease of understanding, certain features of the present disclosure may be described in singular form, even if these features may be plural or recurring within the disclosed embodiments. Each instance of these features may include and / or be included by the singular disclosure, unless the contrary is explicitly stated. For the purpose of simplicity and clarity, not all elements of the disclosed invention must be shown in each of the drawings or discussed in detail below. However, it should be understood that the following discussion may be equally applicable to any and / or all of the components having more than one, unless the contrary is explicitly stated. In addition, for clarity, not all instances of some elements or features may be shown in the drawings.

[0042] Relative terms such as "proximal," "distal," "advance," "retraction," their variations, and the like may generally be considered with respect to the positioning, orientation, and / or operation of various elements relative to a user / operator / manipulator of a device, wherein "proximal" and "retraction" mean or refer to being closer to or toward a user and "distal" and "advance" mean or refer to being farther away from or away from a user. In some cases, the terms "proximal" and "distal" may be arbitrarily designated to facilitate understanding of the present disclosure, and this will be readily understood by those skilled in the art. Other relative terms such as "axial," "circumferential," "longitudinal," "lateral," "radial," and the like and / or their variations generally refer to directions and / or orientations relative to a central longitudinal axis of a disclosed structure or device.

[0043] The term "range" and / or "maximum range" may be understood to mean the maximum measurement of a stated or indicated dimension, while the term "minimum range" may be understood to mean the minimum measurement of a stated or indicated dimension. For example, "outer range" may be understood to mean the maximum outer dimension, "radial range" may be understood to mean the maximum radial dimension, "longitudinal range" may be understood to mean the maximum longitudinal dimension, etc. The "range" of each case may be different (e.g., axial, longitudinal, lateral, radial, circumferential, etc.) and will be apparent to those skilled in the art from the context of singular use. Typically, depending on the intended use, the "range" or "maximum range" may be considered to be the maximum possible measurement dimension. Alternatively, depending on the intended use, the "minimum range" may be considered to be the minimum possible measurement dimension. In some cases, the "range" may generally be measured orthogonally in a plane and / or cross section, but may be measured differently as will be apparent from the particular context, such as, but not limited to: angularly, radially, circumferentially (e.g., along an arc), etc.

[0044] It should be noted that references to "one embodiment", "some embodiments", "other embodiments", etc. in this specification indicate that the described embodiments may include specific features, structures, or characteristics, but each embodiment may not necessarily include the specific features, structures, or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when a specific feature, structure, or characteristic is described in conjunction with one embodiment, it will be within the knowledge of those skilled in the art to implement the specific feature, structure, or characteristic in conjunction with other embodiments, whether or not explicitly described, unless the contrary is explicitly stated. That is, the various individual elements described below, even if not explicitly shown in a specific combination, it is conceivable that they can be combined or arranged with each other to form other additional embodiments or to supplement and / or enrich the described embodiments, as will be understood by those skilled in the art.

[0045] For the sake of clarity, the digital naming of some identifications (for example, first, second, third, fourth, etc.) can be used to name various described and / or claimed features or configurations and / or distinguish between various described and / or claimed features or configurations in all descriptions and / or claims.It should be understood that this digital naming is not intended to be restrictive but only exemplary.In some embodiments, changes and deviations can be made from the digital naming used before for the sake of brevity and clarity.That is to say, the feature or configuration designated as "first" element or configuration can be referred to as "second" element or configuration, "third" element or configuration, etc., or can be completely omitted, and / or different features or configurations can be referred to as "first" element or configuration.Implication and / or naming in each case will be apparent to those skilled in the art.

[0046] Stents and stent delivery systems are used in medical procedures throughout the world. Many of these systems typically have an outer and / or delivery sheath that constrains the expandable stent in a radially constrained delivery state. The self-expanding stent can be freed from the constraints of the delivery sheath by moving the sheath out of the constraining stent, thereby allowing the expandable stent to expand to a radially expanded deployment state.

[0047] For example, some stent delivery systems work by retracting a delivery sheath proximally relative to the stent and / or pushing the stent distally relative to the delivery sheath, thereby causing the stent to begin deployment at its distal end, etc. Once freed from the delivery sheath, the stent can then expand, for example, to force itself against the wall of the body lumen. Such a distal delivery system (DDS) may be desirable, for example, in situations where precise placement of the stent distal end is of particular concern.

[0048] In some other cases, the stent delivery system operates by advancing the delivery sheath distally relative to the stent and / or pushing the stent proximally relative to the delivery sheath, thereby causing the proximal end of the stent to be deployed first. Such a proximal delivery system (PDS) may be desirable, for example, in cases where accurate placement of the proximal end of the stent is of particular concern.

[0049] A common feature of a proximal placement system is that the delivery sheath extends distally beyond the distal end of the stent during and / or after the placement of the stent. Therefore, after the placement of the stent, in order to remove the delivery system from the anatomical structure, it is often necessary to move the placement sheath back proximally through the placement stent.

[0050] During the proximal withdrawal of the delivery sheath back (backward) through the placement of the stent, there is a possibility that a portion of the stent (such as the distal end of the stent) will be hooked, caught, or damaged by a portion of the delivery sheath (such as the proximal end of the delivery sheath). For example, the delivery sheath may have an open proximal end from which the stent is placed, and this open proximal end may provide a step and / or edge and / or surface that will catch or hook on the stent when the delivery sheath is moved backward through the placed stent. In addition and / or alternatively, the delivery sheath is usually moved and / or placed using an inner member having a smaller diameter than the diameter of the placement sheath. The difference and / or increase in diameter between the inner member and the open proximal end of the placement sheath may provide an edge and / or surface and / or step that may catch or hook the stent when the delivery sheath is moved backward through the placement stent. The catch and / or hooking of the stent during the withdrawal of the placement sheath may cause problems. For example, if a portion of the delivery system and / or stent is damaged, then grabbing and / or hooking the stent with the proximal end of the placement sheath during retrieval may result in difficulty in retrieval, risk of stent displacement, stent or delivery system damage, vessel injury, and / or embolism. If the stent is positioned along a curve, the risk of grabbing and / or hooking is increased.

[0051] Therefore, there is a continuing need for improvements in catheters, devices and / or systems for delivering self-expanding stents that help reduce and / or prevent catching and / or hooking of the stent during retraction of the delivery sheath and / or other components of the delivery system. Therefore, some embodiments of the present disclosure may include methods, devices and / or systems that can be configured or designed to help reduce and / or prevent such catching and / or hooking. For example, it is desirable to provide a stent delivery device and / or system, wherein another configuration includes an anti-snagging member that can be located adjacent to the proximal end of the delivery sheath and / or other portions of the delivery system and is designed to allow portions of the delivery system (such as the proximal end of the delivery sheath) to pass through the stent while reducing or eliminating the risk of catching or hooking on the stent.

[0052] Figure 1-Figure 5An exemplary embodiment of a stent delivery system 10 disposed inside a body lumen, such as inside a blood vessel 8, is shown. The stent delivery system 10 includes an inner member 14 including a distal region 16, and a deployment sheath 20 disposed along the distal region 16. The deployment sheath 20 (e.g., at its distal end 24) may be coupled to the inner member 14. A space 19 is defined between the inner member 14 and the deployment sheath 20. An intermediate member 40 including an anti-catch member 50 is movably and / or slidably disposed along the inner member 14 and / or along the deployment sheath 20. A stent 30 for delivery may be disposed in the space 19. This stent delivery system 10 is designed to operate by advancing / translating the deployment sheath 20 distally relative to the stent 30 and / or pushing / translating the stent 30 proximally relative to the deployment sheath 20, thereby causing the proximal end of the stent to be deployed first. Therefore, the stent delivery system 10 is configured as a proximal delivery system (PDS).

[0053] During use, the stent delivery system 10 may include one or more configurations, such as one or more delivery configurations for delivering the stent 30 to a treatment location; one or more deployment configurations for placing the stent 30 at a desired treatment location; and one or more retrieval configurations for removing the delivery system 10 after placement of the stent 30. Figure 1-Figure 5 The stent delivery system 10 is shown in various configurations in succession as it is used to deliver and deploy the stent 30, and then the anti-catch member 50 is positioned adjacent to the proximal end of the deployment sheath 20 to remove the stent delivery system 10. For example, Figure 1 The stent delivery system 10 is shown in a delivery configuration. Figure 2-Figure 5 The stent delivery system 10 is shown in various other configurations including during stent deployment and positioning of the anti-catch member 50 (e.g., Figure 2-Figure 4 ) in various stages of deployment, and retracted configurations (e.g. Figure 5 ).

[0054] In some embodiments, the inner member 14 can be and / or include a solid shaft, a tubular member or a shaft such as a hypotube, a catheter, etc., and / or a combination thereof. In some cases, the inner member 14 may include a guidewire lumen 17, which is used to advance the stent delivery system 10 to the treatment position over the guidewire 15. The inner member 14 includes a distal region 16, a distal end 18, and a proximal region 13 including a proximal end. The inner member 14 can be coupled to the placement sleeve 20 so as to move with it. For example, the distal end 18 of the inner member 14 can be coupled to the distal end 24 of the placement sleeve 20, but other configurations are also conceivable. The inner member 14 can be adapted to, sized to, designed and / or configured to manipulate and / or move the placement sleeve 20 relative to other components of the system 10 (e.g., relative to the stent 30 and / or the intermediate member 40 and / or the anti-catch member 50). In some embodiments, the proximal end of the inner member 14 may include an enlarged flange, interface, handle, and / or other suitable device for operating and / or manipulating the inner member 14 (and thus the placement sleeve 30) relative to the stent 30 and / or the intermediate member 40 or other parts of the device 10. In at least some embodiments, the inner member 14 can be coaxially located within the intermediate member 40 and / or the stent 30 and / or the placement sleeve 30 and / or other parts of the device 10. Some suitable but non-limiting materials for the inner member 14 are, for example, metallic materials, polymeric materials, composite materials, synthetic materials, etc., as described below.

[0055] In some embodiments, the placement sleeve 20 can be and / or include a tubular structure or member. The placement sleeve 20 includes a wall having an outer surface 28 and an inner surface 26 defining a lumen 25. The placement sleeve 20 can be arranged along the distal region 16 of the inner member 14. The placement sleeve 20 can be connected to the inner member 14 so as to move with the inner member 14 and define a stent space 19 between the two. In the illustrated embodiment, the distal end 24 of the placement sleeve 20 is connected to the distal end 18 of the inner member 14, but other attachment configurations are also conceivable. The placement sleeve 20 can be an independent component attached or attached to the inner member 14 using a suitable attachment technique, or can be a component (e.g., a singular component or component) that is a single or integral structure with the inner member 14. The placement sleeve 20 and / or the lumen 25 of the placement sleeve 20 can be designed and / or configured to accommodate the stent 30 (e.g., inside the space 19) in a radially collapsed or constrained configuration. For example, during the delivery of the stent 30 to the target site in the body cavity, the placement sleeve 20 can surround the expandable stent 30 to maintain the stent 30 in a radially constrained state. The placement sleeve 20 and / or the lumen 25 of the placement sleeve 20 can also be sized and / or configured to accommodate the distal region 42 of the intermediate member 40 and / or the anti-catch member 50 (e.g., inside the space 19), as discussed and shown herein. In some embodiments, the placement sleeve 20 can be sized and configured for passing through an introducer, a delivery catheter, a guide catheter, an endoscope, and / or other medical devices, such as during delivery. Some suitable but non-limiting materials for the placement sleeve 20 include, for example, metallic materials, polymeric materials, composite materials, synthetic materials, etc., as described below.

[0056] Stent 30, which is delivered by stent delivery system 10, can be a self-expanding stent and can be configured to transition between a radially collapsed configuration (when radially constrained) and a radially expanded configuration (when not radially constrained). In some embodiments, stent 30 can be biased toward the radially expanded configuration in an equilibrium state. In some embodiments, stent 30 can be self-biased toward the radially expanded configuration. Stent 30 can include a distal end 32, a proximal end 34, an outer surface 35, and an inner surface 36 defining a stent lumen 37. As shown in FIG. Figure 1 As shown in , the stent 30 can be arranged inside the delivery sleeve 20 (eg, within the lumen 25 and / or the space 19 ) to maintain the stent 30 in a radially constrained state during delivery of the stent 30 to the target site in the body lumen 8 .

[0057] In some embodiments, the stent 30 can be formed by cutting or removing material (such as by laser cutting or other suitable processes) from an integral tubular member. In some embodiments, the stent 30 can be formed as a braided, woven and / or knitted stent by one or more wires, filaments, etc. The stent 30 may have a total length suitable for the intended process and / or use. For example, the stent 30 may have a total length ranging from less than 5mm to greater than 200mm. In some embodiments, depending on the intended use, the stent 30 may be formed into a total diameter or outer range ranging from 1mm to 30mm. Some suitable but non-restrictive materials for the stent 30 are described below, including, for example, metallic materials, polymer materials, composite materials, synthetic materials, etc.

[0058] In some embodiments, the intermediate member 40 can be and / or include a tubular member or shaft, such as a hypotube, a catheter, etc., and / or a combination thereof. The intermediate member 40 can include a tubular structure including a wall having an outer surface, and an inner surface defining an inner cavity 47. The intermediate member 40 can include a distal region 42 including a distal end 43, and a proximal region 48 also including a proximal end. In some embodiments, the proximal end of the intermediate member 40 can include an enlarged flange, an interface, a handle, and / or other suitable means for operating and / or manipulating the intermediate member 40 relative to the inner member 14 and / or the placement sleeve 20 and / or the stent 30 and / or other portions of the device 10 (and thus the anti-snagging member 50 as described herein). In at least some embodiments, the intermediate member 40 can be coaxially located on the inner member 14 so that a portion of the inner member 14 extends within the inner cavity 47. The distal region 42 of the intermediate member 40 may also be sized and / or configured to extend and / or be accommodated within the delivery sleeve 20 and / or the lumen 25 of the delivery sleeve 20, as discussed and shown herein. When so positioned, the distal region 42 of the intermediate member 40 may be coaxial with the delivery sleeve 20.

[0059] The intermediate member 40 may be adapted, sized, designed, and / or configured to manipulate and / or move the anti-catch member 50 and / or the stent 30 relative to other components of the system 10 (e.g., relative to the placement sleeve 20 and / or the inner member 14), as described herein. In addition and / or alternatively, the intermediate member 40 may be adapted, sized, designed, and / or configured to act as a stent bed and / or stent support. For example, in some configurations (such as a delivery configuration and / or a placement configuration), the distal region 42 of the intermediate member 40 may be disposed inside the placement sleeve 20, and the stent 30 in a compressed state and inside the placement sleeve 20 may be disposed around (e.g., surround) a portion of the distal region 42 of the intermediate member 40. The distal region 42 of the intermediate member 40 may extend longitudinally within the stent lumen 37 and may be coaxial with the stent 30. In some embodiments, the stent 30 may be compressed to engage with the outer surface of the distal region 42 of the intermediate member 40. In other embodiments, the stent 30 may be disposed around the distal region 42 of the intermediate member 40, but not necessarily compressed into engagement with its outer surface. Some suitable but non-limiting materials for the intermediate member 40 are, for example, metallic materials, polymeric materials, composite materials, synthetic materials, etc., as described below.

[0060] The intermediate member 40 includes an anti-snag member 50. The anti-snag member 50 may be disposed on and / or along the distal region 42 of the intermediate member 40 and may be coupled to the intermediate member 40 so as to move with the intermediate member 40. The anti-snag member 50 may include a proximal region 54, a proximal end 55, a distal region 56, and a distal end 57. The anti-snag member 50 may include an outer surface 51, and an inner surface 52 defining a lumen 53 (the lumen 53 may be in communication with and / or shared with the lumen 47 of the intermediate member 40).

[0061] The anti-snag member 50 can be a separate component that is attached or attached to the intermediate member 40 using a suitable attachment technique, or can be a part of the intermediate member 40 and / or have a construction that is unitary or integral with the intermediate member 40 (e.g., a single part or component). For example, the anti-snag member 50 can be a separate tubular component that is bonded, welded, glued, welded, heat shrunk, or attached to the intermediate member 40. In other examples, the anti-snag member 50 can be an integral extension, portion, or component of the intermediate member 40 that includes an enlarged and / or increased diameter and / or a tapered outer surface. Figure 1-Figure 5In the embodiment shown in , the anti-snag member 50 is coupled to the distal end 43 of the intermediate member 40 and extends distally beyond the distal end 43 of the intermediate member 40, but other configurations are also contemplated. For example, in other embodiments, the anti-snag member 50 can be disposed at and / or along the distal region 42 of the intermediate member 40, such that the anti-snag member 50 is spaced (e.g., proximally) and / or overlaps the distal end 43 of the intermediate member 40. Some suitable but non-limiting materials for the anti-snag member 50 are, for example, metallic materials, polymeric materials, composite materials, synthetic materials, etc., as described below.

[0062] The anti-catch member 50 is a feature and / or structure on the distal region 42 of the intermediate member that can be positioned and / or can be located adjacent to the proximal end 23 of the delivery sheath 20 after deployment of the stent 30. The anti-catch member 50 can include a structure that, when located adjacent to the proximal end 22 of the delivery sheath 20, is adapted, sized, designed, and / or configured to help form a transition zone adjacent to the proximal end 22 of the delivery sheath 20 that allows the delivery sheath 20 to pass proximally and rearwardly through the delivery stent 30 while reducing or eliminating the risk of the proximal end 22 of the delivery sheath 20 catching or hooking on the stent 20. The anti-catch member 50 can include one or more of several structural features that facilitate this function.

[0063] For example, the anti-snagging member 50 may include an enlarged diameter structure (e.g., an enlarged diameter relative to the distal region of the intermediate member 42 and / or the distal region of the inner member 14) that is designed to reduce, close, shield, cover, fill, and / or protect all or a portion of the open proximal end of the delivery cannula 20. Additionally and / or alternatively, the anti-snagging member 50 may include a structure to provide a tapered transition adjacent to the open proximal end of the delivery cannula 20. For example, the anti-snagging member 50 may provide a tapered transition from the open proximal end 22 of the delivery cannula 20 to the outer surface of the distal region 42 of the intermediate member 40. The enlarged diameter and / or tapered configuration of the anti-catch member 50 (e.g., relative to the distal region of the intermediate member 42), when properly positioned adjacent the proximal end 22 of the delivery sheath 20, can help reduce and / or cover and / or hide and / or eliminate steps and / or gaps and / or edges and / or surfaces on or adjacent the proximal end 22 of the delivery sheath 20 that can catch or hook on the stent 30 when the delivery sheath 20 is moved back and proximally past the delivery stent 30. The anti-catch member 50 can generally include at least a portion thereof having a diameter that is wider than the diameter of the distal region 42 of the intermediate member 40. Additionally or alternatively, the anti-catch member 50 can generally include a tapered outer surface. In some embodiments, the anti-snag member 50 may include an enlarged, generally conical and / or cylindrical portion having a tapered outer surface and having an outer extent or diameter along at least a portion thereof that is greater than the outer extent or diameter of the distal region 42 of the intermediate member 40 and / or greater than the outer extent or diameter of the distal region 16 of the inner member 14.

[0064] Additionally and / or alternatively, the anti-catch member 50 may be adapted, sized, designed, and / or configured to act as a distal bumper and / or distal stop for the stent 30. For example, the anti-catch member 50 may include an enlarged portion designed to engage with the distal end of the stent 30 when the stent is in a constrained configuration inside the delivery sleeve 30 and prevent the stent 30 from moving distally relative to and / or with the delivery sleeve 20 during distal translation of the delivery sleeve 20 during stent deployment. Additionally and / or alternatively, the anti-catch member 50 may function as a stopper or bumper in conjunction with the intermediate member 40 to move the stent 30 proximally from the delivery sleeve 20 during stent deployment.

[0065] In some embodiments, all or part of the anti-snap member 50 may be configured to transition between a radially collapsed configuration (when radially constrained) and a radially expanded configuration (when not radially constrained). The anti-snap member 50 or portions thereof may be self-expandable. In some embodiments, all or part of the anti-snap member 50 may be biased toward a radially expanded configuration in an equilibrium state. In some embodiments, the anti-snap member 50 or portions thereof may be self-biased toward a radially expanded configuration. In other embodiments, the anti-snap member 50 is not and / or does not include a collapseable / expandable portion or component (some embodiments of which are further discussed herein).

[0066] exist Figure 1-Figure 5 In the embodiment shown in FIG. 1 , at least the distal region 56 of the anti-catch member 50 can be configured to be in a radially collapsed configuration (when radially constrained by the delivery sheath 20 (e.g., as Figure 1-Figure 3 )) and the radially expanded configuration (when not radially constrained by the delivery sheath 20 (as shown in Figure 4-Figure 5 )). Figure 1-Figure 3 In the configuration shown in , the anti-catch member 50 can be disposed within the interior of the deployment sleeve 20 (e.g., within the lumen 25 and / or space 19) to maintain at least the distal region 56 of the anti-catch member 50 in a radially constrained state (e.g., during delivery and / or in a stent deployment configuration). Figure 4 and Figure 5 In the configuration shown in , the anti-catch member 50 can be disposed outside of the delivery sheath 20 (e.g., proximally moved out of the lumen 25 and / or space 19) and at least the distal region 56 is transformed into a radially expanded configuration when not radially constrained by the delivery sheath 20. The anti-catch member 50 can be a cone and / or tapered tubular member including a proximal end coupled to the intermediate member 40, and an expandable distal region 56.

[0067] In some embodiments, at least a portion of the anti-snap member 50 includes a tapered outer surface 51. For example, at least a portion of the anti-snap member 50 tapers from a smaller outer diameter to a larger outer diameter as it extends distally. Over at least a portion of the length of the anti-snap member 50, the outer extent (profile) or diameter at the more distal portion of the anti-snap member 50 is greater than the outer extent or diameter of the anti-snap member 50 at its more proximal portion, and the transition between these different diameters may be tapered. The taper may exist at a constant angle relative to the longitudinal axis, or may exist in a curved manner. In other embodiments, the taper may exist in a stepped manner, for example, at varying angles along its length and / or include a series of tapered and non-tapered portions. If the anti-snap member 50 is configured to transition between a radially collapsed configuration and a radially expanded configuration, one or more tapers in the outer surface 51 of the anti-snap member 50 may exist in the expanded configuration, in the collapsed configuration, or in both configurations.

[0068] For example, in Figure 1-Figure 3 , the anti-snag member 50 is illustrated in a radially collapsed configuration, wherein the proximal region 54 includes a portion having a tapered outer surface (whose outer diameter increases as it extends distally), but the distal region 56 does not exhibit a tapered outer surface, for example, due to being constrained within the interior of the delivery cannula 20. However, as Figure 4 and Figure 5 As shown in , once freed from the constraints of the delivery sheath 20, the distal region 56 may then expand and may also then include one or more portions having a tapered outer surface (whose outer diameter increases as it extends distally).

[0069] In some embodiments, the anti-snag member 50 can be a tubular and / or conical member having a generally solid wall made of a suitable material. In other embodiments, the anti-snag member 50 can be formed as a spiral, braided, woven, and / or knitted feature made of one or more wires, windings, filaments, etc. Additionally and / or alternatively, the anti-snag member 50 can be a tubular member that can include one or more slits 60 formed therein, such as, for example, Figure 3-Figure 5 . These slits may provide a greater degree of expandability and / or flexibility. If there are multiple slits 60, then multiple distally extending fingers 61 may be formed and / or included in the anti-snag member, such as in the distal region 56. Multiple fingers 61 may constitute the distal region 56 of the anti-snag member, may be expandable, and may include and / or constitute at least a portion of the tapered outer surface of the anti-snag member 50.

[0070] The anti-catch member 50 may include an open distal end 57. For example, the anti-catch member may be and / or include a tubular and / or conical and / or cup-shaped member (with or without the slit 60 and / or fingers 61) having an opening at its distal end 57 into the lumen 53. In some embodiments, the anti-catch member 50 may include a distal region 56 adapted, configured, and / or sized to engage with the delivery cannula 20 when positioned adjacent to the proximal end 22 and / or distal region 21, e.g., to engage with the proximal end 22 and / or distal region 21 of the delivery cannula 20. For example, in some embodiments, the open distal end 57 may be designed and / or configured to receive and / or accept and / or engage the proximal end 22 of the delivery cannula 20. For example, as shown in the figures, when the anti-catch member 50 is expanded, the opening in the distal end 57 may be sized and configured to receive the proximal end 22 of the delivery cannula (see, e.g., Figure 5 ). In some embodiments, the inner surface 52 of the anti-catch member 50 can engage the outer surface 28 of the delivery cannula 20 at and / or adjacent to the proximal end 22 of the delivery cannula. In some embodiments, the inner surface 52 of the anti-catch member 50 and / or the fingers 61 can include and / or have a smooth and / or anti-stick and / or low-friction surface and / or coating and / or material applied thereto. Such a surface or coating can allow for easier engagement and / or separation of the anti-catch member 50 from the delivery cannula 20.

[0071] like Figure 5 As seen in the drawings, when located adjacent to the proximal end 22 of the delivery sheath 20, the anti-catch member 50 can function to shield, cover, close, fill, reduce and / or protect all or a portion of the open proximal end 22 of the delivery sheath 20 and provide a tapered transition zone adjacent to the open proximal end 22 of the delivery sheath 20, for example, to the outer surface 44 of the intermediate member 40. This can help facilitate smooth removal / proximal retrieval and prevent and / or reduce the likelihood that the proximal end 22 of the delivery sheath 20 will catch or hook on the stent during its removal / proximal retrieval.

[0072] In some embodiments, the anti-catch member 50 can engage the proximal end 22 of the delivery cannula 20 in an end-to-end and / or abutting relationship when disposed adjacent the proximal end 22. For example, the distal end 57 and / or distal region 56 of the anti-catch member 50 can include and / or expand to a diameter that can be sized and / or configured to abut and / or be located and / or can be located in an abutting relationship with the proximal end 22 of the delivery cannula 20. When located adjacent the proximal end 22 of the delivery cannula 20 in an abutting relationship (e.g., from the proximal end 22 to the distal end 57), the anti-catch member 50 can function to shield, cover, close, fill, reduce and / or protect all or a portion of the open proximal end 22 of the delivery cannula 20 and provide a tapered transition region adjacent the open proximal end 22 of the delivery cannula 20, for example, to the outer surface 44 of the intermediate member 40. This can help facilitate smooth removal / proximal retrieval and prevent and / or reduce the likelihood that the proximal end 22 of the deployment sheath 20 will catch or hook on the stent during removal / proximal retrieval thereof.

[0073] In some embodiments, the anti-catch member 50 can engage the inner surface 26 of the delivery cannula 20. For example, the delivery cannula 20 includes a lumen 25 having an inner diameter and defining the inner surface 26. The anti-catch member 50 can include a portion thereof (e.g., a distal portion 56) having an outer diameter, and the outer diameter of the portion of the anti-catch member when the anti-catch member 50 is disposed therein can be close to and / or nearly the same as the inner diameter of the delivery cannula 20. Thus, there can be some friction fit between the inner surface 26 of the delivery cannula 20 and the outer surface 51 of the anti-catch member.

[0074] As indicated herein, the stent delivery system 10 is designed to deploy the stent 30 by advancing / translating the deployment sheath 20 distally relative to the stent 30 and / or pushing / translating the stent 30 proximally relative to the deployment sheath 20, thereby causing the proximal end 34 of the stent 30 to be deployed first. Thus, the inner member 14 and the deployment sheath 20 can be axially, longitudinally, slidably, and / or rotationally moved and / or translated together relative to the stent 30 and / or relative to the intermediate member 40 (including the anti-catch member 50). Such movement will serve to deploy the stent 30 and also to move the anti-catch member 50 from a position where the anti-catch member 50 is spaced from the proximal end 22 of the deployment sheath 20 to a position where the anti-catch member 50 is located adjacent to the proximal end 22 of the deployment sheath 20. Figure 1-Figure 5 The step-by-step review and discussion may be used to illustrate the use of the stent delivery system 10 to deliver and deploy the stent 30 , position the anti-catch member 50 adjacent the proximal end of the deployment sheath, and remove the stent delivery system 10 .

[0075] Figure 1The stent delivery system 10 is shown in a delivery configuration, wherein the stent 30 is in a fully compressed state within the delivery sheath 20 (e.g., within the lumen 25 and / or space 19), and is disposed about the distal region 42 of the intermediate member 40. The anti-catch member 50 is disposed distally of the stent 30 within the delivery sheath 20. As can be appreciated, in this configuration, the anti-catch member 50 is located spaced from and / or distal to the proximal end 22 of the delivery sheath 20. In this configuration, the stent delivery system 10 (including the stent 30) can be delivered to a treatment site, such as within a blood vessel 8.

[0076] Figure 2 The stent delivery system 10 is shown in another and / or deployment configuration, wherein the stent 30 is partially deployed. Specifically, Figure 2 The inner member 14 and the delivery sleeve 20 are shown to be relatively distally translated relative to the stent 30 and the intermediate member 40 (including the anti-catch member 50). In other words, Figure 2 The stent 30 and the intermediate member 40 (including the anti-catch member 50) are shown translated relative to the inner member 14 and the delivery sleeve 20. Once the delivery sleeve 20 is removed from the proximal end of the stent 30, the proximal end of the stent 30 can expand by exhibiting a radially outward force, thereby allowing the proximal end of the stent 30 to expand toward the expanded configuration. As the proximal end of the stent 30 radially expands, the distal end of the stent 30 can be maintained in a radially collapsed configuration inside the delivery sleeve 20. For example, the distal end of the stent 30 is maintained in a collapsed configuration by the delivery sleeve 20. Therefore, the stent 30 is partially compressed (at the distal end inside the delivery sleeve 20) and partially expanded (at the proximal end outside the delivery sleeve 20). The stent 30 is still disposed around (e.g., surrounded by) the distal region 42 of the intermediate member 40, and the anti-catch member 50 is disposed distally of the stent 30 inside the delivery sleeve 20. In this configuration, the anti-catch member 50 has moved proximally within the delivery sleeve 20, but is still disposed within the delivery sleeve 20 at a position spaced from the proximal end 22 of the delivery sleeve 20 and / or at a position distal to the proximal end 22 of the delivery sleeve 20. During this translational movement, the anti-catch member 50 can act as a distal stopper and / or buffer for the stent 30, thereby preventing the stent from moving distally relative to and / or with the delivery sleeve 20.

[0077] Figure 3 The stent delivery system 10 is shown in another and / or deployment configuration, wherein the stent 30 is fully deployed. Specifically, Figure 3 Additional relative distal translation of the inner member 14 and the delivery sleeve 20 relative to the stent 30 and the intermediate member 40 (including the anti-catch member 50) is shown. Figure 3The additional relative proximal translation of the stent 30 and the intermediate member 40 (including the anti-catch member 50) relative to the inner member 14 and the placement sleeve 20 is shown. This additional relative translation of these components can gradually release the middle and distal portions of the stent 30 from the placement sleeve 20 until the stent 30 is completely placed, as shown. During this translational movement, the anti-catch member 50 can again act as a distal stopper and / or buffer for the stent 30, thereby preventing the stent 30 from moving distally relative to the distal side of the placement sleeve 20 and / or with the placement sleeve 20. Once the placement sleeve 20 is removed from the stent 30, the stent 30 applies a radial outward force and expands. Therefore, the stent 30 is in a fully expanded configuration and is placed inside the vessel. The distal region 42 of the intermediate member 40 is still arranged inside the lumen of the stent 30. The placement sleeve 20 and the distal region 16 of the intermediate member 14 are arranged on the distal side of the placement stent 30. Anti-catch member 50 is disposed inside delivery sleeve 20 (distal side of stent 30). In this configuration, anti-catch member 50 has been moved proximally inside delivery sleeve 20 to a position closer to proximal end 22, but is still spaced apart from proximal end 22 and / or distal to proximal end 22.

[0078] Figure 4 The stent deployment system 10 is shown in another and / or transitional configuration, wherein the stent 30 is fully deployed and the anti-catch member 50 has been moved to a proximal position of the deployment sheath 20. Specifically, Figure 4 Additional relative distal translation of the inner member 14 and the placement sleeve 20 relative to the intermediate member 40 (including the anti-catch member 50) is shown. Figure 4 Additional relative proximal translation of the inner member 14 and the delivery sleeve 20 relative to the intermediate member 40 (including the anti-catch member 50) is shown. This additional translation of these components can move and / or release the anti-catch member 50 from the interior of the delivery sleeve 20. In this embodiment, the anti-catch member 50 can be radially contracted / expanded, so that once the delivery sleeve 20 is removed from the anti-catch member 50, it exhibits a radially outward force and expands. Therefore, the anti-catch member 50 is in an expanded configuration. The distal region 42 of the intermediate member 40 is still disposed inside the lumen of the delivery stent 30, and the delivery sleeve 20 and the distal region 16 of the inner member 14 are disposed distally of the delivery stent 30. The anti-catch member 50 is disposed proximal to the delivery sleeve 20 and is spaced (e.g., proximally spaced) from the proximal end 22 of the delivery sleeve 20.

[0079] Figure 5 The stent deployment system 10 is shown in another and / or retracted configuration, wherein the stent 30 is fully deployed and the anti-catch member 50 has been moved to a position adjacent the proximal end 22 of the deployment sheath 20. Specifically, Figure 5The intermediate member 40 (including the anti-catch member 50) is shown with respect to the inner member 14 and the relative distal translation of the placement sleeve 20. In other words, Figure 5 Relative proximal translation of the inner member 14 and the delivery sleeve 20 relative to the intermediate member 40 (including the anti-catch member 50) is shown. This translation of these components can move the anti-catch member 50 to a position adjacent to the proximal end 22 of the delivery sleeve 20. In this embodiment, the anti-catch member 50 is an expandable member that can engage the proximal end 22 of the delivery sleeve 20. The distal region 42 of the intermediate member 40 is still disposed within the lumen of the delivery stent 30. The delivery sleeve 20 and the distal region 16 of the inner member 14 are still disposed distal to the delivery stent 30. In order to remove the delivery system 10 from the anatomical structure, it is necessary to move the delivery sleeve 20 proximally through the delivered stent 30 and out backward. The anti-catch member 50, when located adjacent to the proximal end 22 of the delivery sheath 20, can function to shield, cover, close, fill, reduce and / or protect all or a portion of the open proximal end 22 of the delivery sheath 20, and provide a tapered transition zone adjacent to the open proximal end 22 of the delivery sheath 20 during retrieval. Thus, the delivery sheath 20 can pass through the stent 30, and the anti-catch member is designed to allow the proximal end 22 of the delivery sheath 20 to pass through the stent 30 without catching on the stent.

[0080] As can be appreciated, any configuration of the stent delivery system 10 in which the anti-catch member 50 is spaced from the proximal end 22 of the delivery sleeve 20 can be considered a first position, and any configuration of the stent delivery system 10 in which the anti-catch member is adjacent to the proximal end 22 of the delivery sleeve 20 can be considered a second position, and the anti-catch member can be moved relative to the delivery sleeve 20 so that it can transition from the first position to the second position.

[0081] Figure 6 and Figure 7 Another exemplary embodiment of a stent delivery system is shown, which is similar in shape and function to the reference Figure 1-Figure 5The stent delivery system shown and described, wherein similarly named structures and / or similarly numbered structures may be similar in shape, function, and materials to those discussed elsewhere herein. However, in the present embodiment, the anti-catch member 150 included in the intermediate member 40 is non-collapsible / expandable. The anti-catch member 150 may be disposed at and / or along the distal region 42 of the intermediate member 40, and may be coupled to the intermediate member 40 so as to move with the intermediate member 40. The anti-catch member 150 may include a proximal region 154, a proximal end 155, a distal region 156, a distal end 157, and an outer surface 151. Some suitable but non-limiting materials for the anti-catch member 150 are, for example, metallic materials, polymeric materials, composite materials, synthetic materials, etc., as described below.

[0082] The anti-snap member 150 includes a tapered outer surface 151. For example, at least a portion of the anti-snap member 150 tapers from a smaller outer diameter to a larger outer diameter as it extends distally. Over at least one region of the length of the anti-snap member 150, the outer extent or diameter of the more distal portion of the anti-snap member 150 is greater than the outer extent or diameter of the anti-snap member 150 at a more proximal portion thereof, and the transition between these different diameters may be tapered. Thus, the anti-snap member 150 includes a distal portion 156 having a first outer diameter, and a proximal portion 154 having a second outer diameter, and the first outer diameter is greater than the second outer diameter. As can be appreciated, the anti-snap member 151 is characterized as comprising a conical tubular member. The taper may exist at a constant angle relative to the longitudinal axis, or may exist in a curvilinear manner. In some embodiments, the taper may exist in a stepped manner, such as at a varying angle along its length.

[0083] Thus, in some embodiments, the anti-snagging feature 150 can be a feature at and / or constructed on the distal region of the intermediate member 40 that tapers to a larger diameter as it extends distally. This larger diameter and taper can help to soften the size and / or abruptness of the transition at the proximal end 22 of the delivery cannula 20, and can be designed to allow the proximal end 22 of the delivery cannula 20 to pass through the stent 30 without snagging on the stent.

[0084] The anti-snap member 150 can be a separate component that is attached or attached to the intermediate member 40 using a suitable attachment technique, or can be a component (e.g., a singular component or part) that is of unitary or integral construction with the intermediate member 40. For example, the anti-snap member 150 can be a separate tubular component that is bonded, welded, glued, welded, heat shrunk, or attached to the intermediate member 40. In other examples, the anti-snap member 150 can be an integral extension, portion, or component of the intermediate member 40 that includes an enlarged and / or increased diameter and / or a tapered outer surface. In some embodiments, for example, as shown, the anti-snap member 150 is coupled to the distal end 43 of the intermediate member 40 and extends distally beyond the distal end 43 of the intermediate member 40, but other configurations are also contemplated. For example, in other embodiments, the anti-snagging member 150 may be arranged in the distal region 42 of the intermediate member 40 and / or arranged along the distal region 42 of the intermediate member 40, so that the anti-snagging member 150 is spaced apart from the distal end 43 of the intermediate member 40 (for example, proximal to the distal end 43 of the intermediate member 40) and / or overlaps with the distal end 43 of the intermediate member 40.

[0085] Figure 6 Shows something like Figure 3 The stent delivery system 110 is in a deployed configuration, wherein the stent 30 has been fully deployed. Figure 6 The stent delivery system 110 shown in FIG. 1 has been transformed from an initial and / or delivery configuration (similar to Figure 1 ), wherein the stent 30 is in a compressed state completely disposed within the delivery sleeve 20, and then in a partially deployed configuration (similar to Figure 2 ), wherein the support 30 is partially disposed, transitioning to the illustrated configuration. This transition will be formed by relative translation of the components, as discussed herein. It should also be noted that in these previous configurations (e.g., similar to Figure 1 and Figure 2 ), the anti-catch member 150 will be arranged inside the delivery sleeve 20 at the distal side of the stent 30, spaced from the proximal end 22 of the delivery sleeve 20 and / or at the distal side of the proximal end 22 of the delivery sleeve 20.

[0086] Figure 6 The relative distal translation of the inner member 14 and the delivery sleeve 20 relative to the stent 30 and the intermediate member 40 (including the anti-catch member 150) is then shown. Or in other words, Figure 6The additional relative proximal translation of the stent 30 and the intermediate member 40 (including the anti-catch member 150) relative to the inner member 14 and the placement sleeve 20 is shown. This additional relative translation of these components can gradually release the middle and distal portions of the stent 30 from the placement sleeve 20 until the stent is fully placed, as shown. During this translational movement, the anti-catch member 150 can again act as a distal stopper and / or buffer for the stent 30, thereby preventing the stent 30 from moving distally relative to the placement sleeve 20 and / or inside the placement sleeve 20. Once the placement sleeve 20 is removed from the stent 30, the stent 30 applies a radial outward force and expands. Therefore, the stent 30 is in a fully expanded configuration and is placed inside the vessel. The distal region 42 of the intermediate member 40 is still arranged inside the lumen of the stent 30. The placement sleeve 20 and the distal region 16 of the intermediate member 14 are arranged on the distal side of the placement stent 30. Anti-catch member 150 is arranged inside the deployment sleeve 20 (distal side of stent 30). In this configuration, anti-catch member 150 has moved proximally inside the deployment sleeve 20 to a position closer to the proximal end 22, but is still spaced from the proximal end 22 and / or at a distal position of the proximal end 22.

[0087] Figure 7 The stent deployment system 110 is shown in another and / or retracted configuration, wherein the stent 30 is fully deployed and the anti-catch member 150 has been moved to a position adjacent the proximal end 22 of the deployment sheath 20. Specifically, Figure 7 The intermediate member 40 (including the anti-catch member 150) is shown with respect to the inner member 14 and the relative distal translation of the placement sleeve 20. In other words, Figure 7Relative proximal translation of the inner member 14 and the delivery sleeve 20 relative to the intermediate member 40 (including the anti-catch member 150) is shown. This translation of these components can move the anti-catch member 150 to a position adjacent to the proximal end 22 of the delivery sleeve 20. In this embodiment, the anti-catch member 150 is not an expandable member, but provides a tapered transition adjacent to the proximal end 22 of the delivery sleeve 20. The distal region 42 of the intermediate member 40 is still disposed within the lumen of the delivery stent 30. The delivery sleeve 20 and the distal region 16 of the intermediate member 14 are still disposed distal to the delivery stent 30. In order to remove the delivery system 10 from the anatomical structure, the delivery sleeve 20 needs to be moved proximally through the delivery stent 30 backwards. The anti-catch member 150, when located adjacent to the proximal end 22 of the delivery sheath 20, can function to shield, cover, close, fill, reduce and / or protect all or a portion of the open proximal end 22 of the delivery sheath 20, and provide a tapered transition adjacent to the open proximal end 22 of the delivery sheath 20 during retrieval. Thus, the delivery sheath 20 can pass through the stent 30, and the anti-catch member 150 is designed to allow the proximal end 22 of the delivery sheath 20 to pass through the stent 30 without catching on the stent.

[0088] As can be appreciated, any configuration of the stent delivery system 110 in which the anti-catch member 150 is spaced from the proximal end 22 of the delivery sleeve 20 can be considered a first position, and any configuration of the stent delivery system 10 in which the anti-catch member 150 is adjacent to the proximal end 22 of the delivery sleeve 20 can be considered a second position, and the anti-catch member 150 can be moved relative to the delivery sleeve 20 so that the anti-catch member 150 can be transitioned from the first position to the second position.

[0089] Materials that may be used in the various components of the stent delivery systems (e.g., 10 and 110) disclosed herein may include materials commonly associated with medical devices. For the purpose of simplicity, the following discussion refers to the stent delivery systems (10 and 110). However, this is not intended to limit the devices and methods described herein, as the discussion may be applicable to other similar stent delivery systems and / or components thereof.

[0090] The stent delivery systems 10 and 110 and / or their other components may be made of metals, metal alloys, polymers (some examples of which are described below), metal-polymer composites, ceramics, combinations thereof, or other suitable materials. Some examples of suitable polymers may include polytetrafluoroethylene (PTFE), ethylene-tetrafluoroethylene copolymer (ETFE), fluorinated ethylene propylene copolymer (FEP), polyoxymethylene (POM, such as available from DuPont) and polyoxymethylene (POM). ), polyetherester block copolymers, polyurethanes (e.g., polyurethane 85A), polypropylene (PP), polyvinyl chloride (PVC), polyetheresters (e.g., available from DSM Engineering Plastics ), ether- or ester-based copolymers (e.g., poly(terephthalate) / poly(alkylene terephthalate) and / or other polyester elastomers, such as those available from DuPont ), polyamide (e.g., available from Bayer AG Or available from Elf Atochem ), elastic polyamides, polyamide / ether block copolymers, polyether block amides (PEBA, for example, commercially available), ethylene-vinyl acetate copolymer (EVA), silicone, polyethylene (PE), Marlex high-density polyethylene, Marlex low-density polyethylene, linear low-density (e.g. ), 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(p-phenylene terephthalamide) (e.g., ), polysulfone, nylon, nylon-12 (such as available from EMS American Grilon Company ), perfluoropropyl vinyl ether (PFA), ethylene-vinyl alcohol copolymer, polyolefin, polystyrene, epoxy resin, polyvinylidene chloride (PVdC), (styrene-b-isobutylene-b-styrene) triblock copolymer (e.g., SIBS and / or SIBS 50A), polycarbonate, ionomer, biocompatible polymer, other suitable materials, or mixtures, copolymers thereof, polymer / metal composites, etc. In some embodiments, the cannula can be mixed with a liquid crystal polymer (LCP). For example, the mixture can contain up to about 6% LCP.

[0091] Some examples of suitable metals and metal alloys include stainless steels, such as 304V, 304L, and 316LV stainless steels; mild steels; nickel-titanium alloys, such as linear elastic and / or superelastic nickel-titanium alloys; other nickel alloys, such as nickel-chromium-molybdenum alloys (e.g., UNS: N06625, e.g., UNS:N06022 UNS:N10276 other alloys, etc.), nickel-copper alloys (e.g., UNS: N04400, etc.), 400, 400, 400, etc.), nickel-cobalt-chromium-molybdenum alloys (e.g., UNS: R30035, etc.), etc.), nickel-molybdenum alloys (e.g., UNS: N10665, etc.), alloy ), 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, etc.; cobalt-chromium alloys; cobalt-chromium-molybdenum alloys (for example, UNS: R30003 such as etc.); platinum-rich stainless steel; titanium; combinations thereof; etc.; or any other suitable material.

[0092] At least in some embodiments, part or all of the stent delivery system 10 and / or 110 and / or its components may also be doped with radiopaque materials, made of radiopaque materials, or contain radiopaque materials. Radiopaque materials are understood to be materials that can produce relatively bright images on a fluorescent screen or another imaging technique during a medical procedure. This relatively bright image helps users of the stent delivery system and / or its other components determine their position. Some examples of radiopaque materials may include, but are not limited to: gold, platinum, palladium, tantalum, tungsten alloys, polymer materials filled with radiopaque fillers, etc. In addition, other radiopaque marker bands and / or coils may also be incorporated into the design of the stent delivery system and / or its other components to obtain the same results.

[0093] In some embodiments, a degree of magnetic resonance imaging (MRI) compatibility is imparted to the stent delivery system and / or its other components. For example, the stent delivery system and / or its other components or portions thereof may be made of materials that do not significantly distort the image and form noticeable artifacts (e.g., gaps in the image). Certain ferromagnetic materials, for example, would be unsuitable because they would produce artifacts in MRI images. The stent delivery system and / or its other components or portions thereof may also be made of materials that can be imaged by a nuclear magnetic resonance machine. Some materials that exhibit these properties include, for example, tungsten, cobalt-chromium-molybdenum alloys (e.g., UNS: R30003, etc.). etc.), nickel-cobalt-chromium-molybdenum alloys (e.g., UNS: R30035, etc.), etc.), nickel-titanium alloy, etc., and other materials.

[0094] It should be understood that the present disclosure is in many respects illustrative only. Changes may be made in the details, particularly in the configuration, size, and arrangement of steps, without exceeding the scope of the present disclosure. This may include, within the appropriate range, using any feature of one exemplary embodiment in other embodiments. Of course, the scope of the present invention is defined by the terms in which the appended claims are expressed.

Claims

1. A stent delivery system, comprising: an inner member having a distal region; a placement sleeve disposed along a distal region of the inner member and defining a space between the inner member and the placement sleeve, the placement sleeve having a proximal end; The inner member and the placement sleeve are designed to slide distally relative to the stent arranged in the space between the inner member and the placement sleeve so as to place the stent; as well as An intermediate member is arranged along the inner member, and the intermediate member includes an anti-catch member connected to the distal end of the intermediate member, the anti-catch member has a tapered structure and the diameter of at least a portion of the anti-catch member is larger than the diameter of the distal portion of the intermediate member, and the intermediate member is movable relative to the delivery sleeve so that the anti-catch member can be located in a position adjacent to the proximal end of the delivery sleeve and is designed to allow the proximal end of the delivery sleeve to pass through the stent without being caught on the stent.

2. The stent delivery system according to claim 1, wherein: The anti-snatch member comprises a collapsible member and, optionally, a self-expanding member.

3. The stent delivery system according to any one of claims 1 to 2, wherein: The anti-snap member includes a conical tubular member.

4. The stent delivery system according to claim 3, wherein: The tapered tubular member includes a proximal portion coupled to the intermediate member, and an expandable distal portion.

5. The stent delivery system according to claim 4, wherein: The expandable distal portion includes a plurality of fingers.

6. The stent delivery system according to any one of claims 1 to 2, wherein: The anti-snag member includes a distal portion having a first outer diameter and a proximal portion having a second outer diameter, and the first outer diameter is greater than the second outer diameter.

7. The stent delivery system according to claim 6, wherein: The delivery cannula includes an inner diameter, and wherein the first outer diameter of the anti-snag member is proximate to the inner diameter of the delivery cannula.

8. The stent delivery system according to any one of claims 1 to 2, wherein: The delivery sleeve includes an inner surface, and the delivery sleeve is configured to receive an entirety of the stent.

9. The stent delivery system according to any one of claims 1 to 2, wherein: The anti-snag member includes a tapered outer surface of a portion of the intermediate member.

10. The stent delivery system according to any one of claims 1 to 2, wherein: The anti-catch member is movable relative to the delivery cannula such that the anti-catch member has a first position in which the catch member is spaced from the proximal end of the delivery cannula and a second position in which the anti-catch member abuts the proximal end of the delivery cannula.

11. The stent delivery system according to any one of claims 1 to 2, wherein: The anti-catch member is movable relative to the delivery sleeve so that the anti-catch member has a first position and a second position. In the first position, the anti-catch member is arranged inside the delivery sleeve and is located distal to the proximal end of the delivery sleeve. In the second position, the anti-catch member is engaged with the delivery sleeve at the proximal end of the delivery sleeve or adjacent to the proximal end of the delivery sleeve.

12. The stent delivery system according to any one of claims 1 to 2, wherein: The anti-catch member has a constrained configuration in which the anti-catch member is disposed inside the delivery sheath and an expanded configuration in which at least a portion of the anti-catch member is disposed outside the delivery sheath.

13. The stent delivery system according to any one of claims 1 to 2, wherein: The anti-snag member includes an inner surface designed to engage an outer surface of the delivery cannula.

14. A stent delivery system, comprising: an inner member having a distal region; a placement sleeve coupled to the inner member and disposed along a distal region of the inner member, the placement sleeve having a proximal end; a stent, the stent being disposed in a space between the inner member and the placement sleeve; an intermediate member disposed along the inner member and including a distal anti-snap member coupled to the intermediate member, the anti-snap member having a tapered structure and at least a portion of the anti-snap member having a diameter greater than a diameter of a distal portion of the intermediate member; The inner member and the placement sleeve are designed to slide distally relative to the stent to place the stent; and The intermediate member includes the anti-catch member, which is movable relative to the delivery sleeve, so that the anti-catch member includes a first position in which the anti-catch member is spaced apart from the proximal end of the delivery sleeve and a second position in which the anti-catch member is located adjacent to the proximal end of the delivery sleeve, and is designed to allow the proximal end of the delivery sleeve to pass through the stent without being caught on the stent.

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