Patent Description:
The left atrial appendage is a small organ attached to the left atrium of the heart. During normal heart function, as the left atrium constricts and forces blood into the left ventricle, the left atrial appendage constricts and forces blood into the left atrium. The ability of the left atrial appendage to contract assists with improved filling of the left ventricle, thereby playing a role in maintaining cardiac output. However, in patients suffering from atrial fibrillation, the left atrial appendage may not properly contract or empty, causing stagnant blood to pool within its interior, which can lead to the undesirable formation of thrombi within the left atrial appendage.

Thrombi forming in the left atrial appendage may break loose from this area and enter the blood stream. Thrombi that migrate through the blood vessels may eventually plug a smaller vessel downstream and thereby contribute to stroke or heart attack. Clinical studies have shown that the majority of blood clots in patients with atrial fibrillation originate in the left atrial appendage. As a treatment, medical devices have been developed which are deployed to close off the left atrial appendage. Of the known medical devices and methods, each has certain advantages and disadvantages. There is an ongoing need to provide alternative medical devices and introducers as well as alternative methods for manufacturing and using medical devices and introducers.

<CIT> discloses an implant positionable within subject's left heart atrium, for facilitating functional activity thereof. Implant includes: implant body housing physiological parameter sensing or/and measuring means; coupling means for coupling with an implant deployment device; and septum gripper having a flexible gripping sleeve fixedly connected to implant body wall, and selectively shapeable to pass through organ wall septum opening, and for gripping onto organ wall, such that implant body is fixatable or/and stabilizable across organ wall and through septum opening, to facilitate sensing or/and measuring in subject's body organ.

In a first aspect, a medical system may comprise a left atrial appendage closure device including an expandable framework and a proximal hub centered on a central longitudinal axis of the expandable framework. An insert may be disposed within the proximal hub, the insert including a collar configured to engage the proximal hub, a recess extending into the insert from a proximal end of the insert, and a post member disposed within the recess. The post member may be radially spaced apart from the collar to define a gap between the post member and the collar, and the post member may extend proximally from a distal end of the recess to a proximal surface. The insert may include a first connection structure disposed distal of the proximal surface. The medical system may comprise a delivery catheter having a second connection structure proximate a distal end of the delivery catheter, the second connection structure being configured to engage the first connection structure in a delivery configuration of the medical system. The distal end of the delivery catheter includes a hollow portion configured to receive the post member in the delivery configuration.

In addition or alternatively to any aspect described herein, a sensor is disposed within the post member.

In addition or alternatively to any aspect described herein, the sensor is a pressure sensor and the proximal surface is a diaphragm extending across a proximal end of the post member, the diaphragm being configured to transmit a pressure within a left atrium to the pressure sensor when the expandable framework is disposed within an ostium of the left atrial appendage.

In addition or alternatively to any aspect described herein, the delivery catheter includes at least one aperture extending through a side wall of the delivery catheter proximate the distal end of the delivery catheter.

In addition or alternatively to any aspect described herein, the left atrial appendage closure device includes a gap seal configured to extend across a proximal end of the gap when the medical system is disposed in a released configuration in which the delivery catheter is disengaged from the left atrial appendage closure device.

In addition or alternatively to any aspect described herein, the gap seal is configured to deflect into the recess when the medical system is in the delivery configuration.

In addition or alternatively to any aspect described herein, the first connection structure includes a first threaded portion disposed on an outside surface of the post member or an inside surface of the collar.

In addition or alternatively to any aspect described herein, the second connection structure includes a second threaded portion disposed proximate the distal end of the delivery catheter, the second threaded portion being configured to threadably mate with the first threaded portion when the medical system is in the delivery configuration.

In addition or alternatively to any aspect described herein, the first connection structure includes at least one groove formed in an outside surface of the post member or an inside surface of the collar, wherein the at least one groove includes a longitudinal portion and a circumferential portion extending from a distal end of the longitudinal portion.

In addition or alternatively to any aspect described herein, the second connection structure includes at least one radially extending projection proximate the distal end of the delivery catheter, the at least one radially extending projection being configured to engage the at least one groove when the medical system is in the delivery configuration.

In addition or alternatively to any aspect described herein, the first connection structure includes at least one projection extending radially outward from the post member.

In addition or alternatively to any aspect described herein, the second connection structure includes two or more movable jaws configured to engage the at least one projection to clamp the post member between the two or more movable jaws when the medical system is in the delivery configuration.

In addition or alternatively to any aspect described herein, the first connection structure includes a channel formed in an outside surface of the post member and extending circumferentially around the post member distal of the proximal surface.

In addition or alternatively to any aspect described herein, the second connection structure includes: a distal cap member disposed at the distal end of the delivery catheter and configured to span the proximal surface of the post member, wherein the distal cap member includes at least one aperture formed in a laterally extending surface of the distal cap member; and a tether extending longitudinally alongside the delivery catheter, through the at least one aperture, and around the post member within the channel when the medical system is in the delivery configuration.

In addition or alternatively to any aspect described herein, a medical system may comprise a left atrial appendage closure device including an expandable framework and a proximal hub centered on a central longitudinal axis of the expandable framework. An insert may be disposed within the proximal hub, the insert including a collar defining a circumferential wall of the insert configured to engage the proximal hub, a recess extending axially into the insert from a proximal end of the insert, and a post member disposed within the recess. The post member may be radially spaced apart from the collar to define an annular gap between the post member and the collar, and the post member may extend proximally from a distal end of the recess to a proximal surface disposed proximate the proximal end of the insert. The insert may include a first connection structure disposed distal of the proximal surface. A pressure sensor may be disposed within the post member and in communication with the proximal surface of the post member for sensing a fluid pressure proximal of the left atrial appendage closure device. The medical system may comprise a delivery catheter having a second connection structure proximate a distal end of the delivery catheter, the second connection structure being configured to engage the first connection structure in a delivery configuration of the medical system. The distal end of the delivery catheter may include a hollow portion configured to extend over the post member and within the circumferential wall in the delivery configuration such that the distal end of the delivery catheter is disposed distal of the proximal end of the insert.

In addition or alternatively to any aspect described herein, a medical system may comprise a left atrial appendage closure device including a self-expanding framework and a proximal hub centered on a central longitudinal axis of the expandable framework. An insert may be disposed within the proximal hub, the insert including a collar defining a circumferential wall of the insert configured to engage the proximal hub, a recess extending axially into the insert from a proximal end of the insert, and a post member disposed within the recess radially inward of the circumferential wall. The post member may extend proximally from a distal end of the recess to a proximal surface. A sensor, a capacitor, and a communication coil may be disposed within the insert. The medical system may comprise a delivery catheter including a hollow portion disposable within the insert radially inward of the circumferential wall and radially outward of the post member in a delivery configuration of the medical system.

In addition or alternatively to any aspect described herein, the insert includes a first connection structure disposed distal of the proximal surface of the post member and the delivery catheter includes a second connection structure configured to engage the first connection structure in the delivery configuration of the medical system.

In addition or alternatively to any aspect described herein, in the delivery configuration of the medical system, the delivery catheter does not contact the proximal surface of the post member.

In addition or alternatively to any aspect described herein, the left atrial appendage closure device includes an occlusive element disposed over at least a portion of the expandable framework. The expandable framework is configured to shift between a collapsed configuration and a deployed configuration. The occlusive element is configured to prevent thrombi from exiting a left atrial appendage when the expandable framework is disposed within an ostium of the left atrial appendage in the deployed configuration.

In addition or alternatively to any aspect described herein, the expandable framework includes a plurality of interconnected struts joined together at the proximal hub.

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.

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. However, in the interest of clarity and ease of understanding, while every feature and/or element may not be shown in each drawing, the feature(s) and/or element(s) may be understood to be present regardless, unless otherwise specified.

The term "extent" may be understood to mean a greatest measurement of a stated or identified dimension, unless the extent or dimension in question is preceded by or identified as a "minimum", which may be understood to mean a smallest measurement of the stated or identified dimension. For example, "outer extent" may be understood to mean an outer dimension, "radial extent" may be understood to mean a radial dimension, "longitudinal extent" may be understood to mean a longitudinal dimension, etc. Each instance of an "extent" may be different (e.g., axial, longitudinal, lateral, radial, circumferential, etc.) and will be apparent to the skilled person from the context of the individual usage. Generally, an "extent" may be considered a greatest possible dimension measured according to the intended usage, while a "minimum extent" may be considered a smallest possible dimension measured according to the intended usage. In some instances, an "extent" may generally be measured orthogonally within a plane and/or cross-section, but may be, as will be apparent from the particular context, measured differently - such as, but not limited to, angularly, radially, circumferentially (e.g., along an arc), etc..

The terms "monolithic" and "unitary" shall generally refer to an element or elements made from or consisting of a single structure or base unit/element. A monolithic and/or unitary element shall exclude structure and/or features made by assembling or otherwise joining multiple discrete elements together.

In some embodiments, alterations of and deviations from previously used numerical nomenclature may be made in the interest of brevity and clarity.

The following figures illustrate selected components and/or arrangements of an implant for occluding the left atrial appendage, a medical system for occluding the left atrial appendage, and/or methods of using the implant and/or the medical system. It should be noted that in any given figure, some features may not be shown, or may be shown schematically, for simplicity. Additional details regarding some of the components of the implant and/or the system may be illustrated in other figures in greater detail. While discussed in the context of occluding the left atrial appendage, the implant and/or the system may also be used for other interventions and/or percutaneous medical procedures within a patient. Similarly, the devices and methods described herein with respect to percutaneous deployment may be used in other types of surgical procedures, as appropriate. For example, in some examples, the devices may be used in a non-percutaneous procedure. Devices and methods in accordance with the disclosure may also be adapted and configured for other uses within the anatomy.

Turning now to the figures, <FIG> illustrate a medical system <NUM> including an outer sheath <NUM> having a lumen <NUM> extending from a proximal opening to a distal opening, a delivery catheter <NUM> slidably disposed within the lumen <NUM>, and a left atrial appendage closure device <NUM> having an expandable framework <NUM> configured to shift between a collapsed configuration (e.g., <FIG>), wherein the left atrial appendage closure device <NUM> is disposed within the lumen <NUM> proximate the distal opening in the collapsed configuration, and a deployed configuration (e.g., <FIG>). The left atrial appendage closure device <NUM> and/or the expandable framework <NUM> may be configured to shift between the collapsed configuration and the deployed configuration when the left atrial appendage closure device <NUM> is disposed distal of the distal opening of the lumen <NUM> and/or the outer sheath <NUM>, and/or when the left atrial appendage closure device <NUM> is unconstrained by the outer sheath <NUM>. The left atrial appendage closure device <NUM> may be disposed at and/or releasably connected to a distal portion of the delivery catheter <NUM>. The delivery catheter <NUM> may be slidably and/or rotatably disposed within the lumen <NUM> of the outer sheath <NUM>. In some embodiments, a proximal end of the delivery catheter <NUM> may extend proximally of a proximal end of the outer sheath <NUM> and/or the proximal opening of the lumen <NUM> for manual manipulation by a clinician or practitioner. In some embodiments, the example left atrial appendage closure device <NUM> may be removably attached, joined, or otherwise connected to the distal end of the delivery catheter <NUM>. Some suitable, but non-limiting, examples of materials for the medical system <NUM>, the delivery catheter <NUM>, the outer sheath <NUM>, and/or the left atrial appendage closure device <NUM>, etc. are discussed below. It is contemplated that any and/or all example occlusive implants disclosed herein may be used in accordance with and/or be associated with the example medical system <NUM> described above.

<FIG> illustrate an example configuration of the left atrial appendage closure device <NUM> comprising the expandable framework <NUM> configured to shift between the collapsed configuration and the expanded configuration. In some embodiments, the left atrial appendage closure device <NUM> may include a proximal hub <NUM> centered on a central longitudinal axis of the expandable framework <NUM>. For example, the proximal hub <NUM> may be coaxial with the central longitudinal axis of the expandable framework <NUM>. In some embodiments, the expandable framework <NUM> may include a plurality of interconnected struts joined together at the proximal hub <NUM>. In some embodiments, the proximal hub <NUM> may be integrally formed with and/or may be monolithically formed with the expandable framework <NUM> and/or the plurality of interconnected struts. In some embodiments, the left atrial appendage closure device <NUM> may include, and/or the expandable framework <NUM> may be, a self-expanding framework.

The expandable framework <NUM> may be compliant and substantially conform to and/or be in sealing engagement with the shape and/or geometry of a lateral wall and/or an ostium of a left atrial appendage in the expanded configuration. In some embodiments, the left atrial appendage closure device <NUM> may expand to a size, extent, or shape less than or different from a maximum unconstrained extent, as determined by the surrounding tissue and/or lateral wall of the left atrial appendage. Reducing a thickness of various elements of the expandable framework <NUM> may increase the flexibility and compliance of the expandable framework <NUM> and/or the left atrial appendage closure device <NUM>, thereby permitting the expandable framework <NUM> and/or the left atrial appendage closure device <NUM> to conform to the tissue around it, rather than forcing the tissue to conform to the expandable framework <NUM> and/or the left atrial appendage closure device <NUM>.

In some embodiments, the left atrial appendage closure device <NUM> may optionally include an occlusive element <NUM> (e.g., a mesh, a fabric, a membrane, and/or other surface treatment) disposed on, disposed over, disposed about, or covering at least a portion of the expandable framework <NUM>, as seen in <FIG>. In some embodiments, the occlusive element <NUM> may be disposed on, disposed over, disposed about or cover at least a portion of an outer (or outwardly facing) surface of the expandable framework <NUM>. In some embodiments, the occlusive element <NUM> may be secured to and/or may extend radially outward from the proximal hub <NUM>.

In some embodiments, the expandable framework <NUM> may include a plurality of anchor members <NUM> disposed about a periphery of the expandable framework <NUM> in the expanded configuration. The plurality of anchor members <NUM> may extend radially outward from the expandable framework <NUM>. In some embodiments, at least some of the plurality of anchor members <NUM> may each have and/or include a body portion, a tip portion, and a barb projecting circumferentially therefrom. In some embodiments, some and/or each of the plurality of anchor members <NUM> have at least one barb projecting circumferentially therefrom. Some suitable, but non-limiting, examples of materials for the expandable framework <NUM>, the plurality of anchor members <NUM>, etc. are discussed below.

In some embodiments, the plurality of anchor members <NUM> may provide an anchoring mechanism to aid in retaining the left atrial appendage closure device <NUM> at a target site within a patient's anatomy (i.e., the left atrial appendage, for example) in the expanded configuration. However, the barb(s) may be configured, positioned, and/or arranged such that engagement of the barb(s) with surrounding tissue at the target site is minimized or avoided. For example, the barb(s) may not puncture, pierce, and/or extend into the surrounding tissue in the expanded configuration. Additionally, in some embodiments, the plurality of anchor members <NUM> may provide an attachment mechanism for securing the occlusive element <NUM> to the expandable framework <NUM>.

In some embodiments, the occlusive element <NUM> may extend distally past at least some of the plurality of anchor members <NUM>. In some embodiments, the occlusive element <NUM> may extend distally past each and/or all of the plurality of anchor members <NUM>. In at least some embodiments, at least a distal portion of the occlusive element <NUM> may be attached to the expandable framework <NUM>. In some embodiments, at least some of the plurality of anchor members <NUM> extend and/or project through the occlusive element <NUM>. In some embodiments, each and/or all of the plurality of anchor members <NUM> extend and/or project through the occlusive element <NUM>. In some embodiments, the membrane or occlusive element may be attached to the frame at some and/or each of the plurality of anchor members <NUM>, for example, by passing some and/or each of the plurality of anchor members <NUM> through the occlusive element <NUM>.

In some embodiments, the barb and/or the tip portion on some and/or each of the at least some of the plurality of anchor members <NUM> may be disposed radially outward of the occlusive element <NUM> and/or exterior of the occlusive element <NUM> while the base of its respective anchor member is disposed radially inward of and/or interior of the occlusive element <NUM>. The barb may serve to retain the occlusive element <NUM> on the expandable framework <NUM>, thereby preventing the occlusive element <NUM> from working loose and/or releasing from the expandable framework <NUM> as the expandable framework <NUM> is shifted between the collapsed configuration and the deployed configuration. In some embodiments, attachment of the distal portion of the occlusive element <NUM> to the expandable framework <NUM> is devoid of sutures and/or adhesives.

In one example, when the left atrial appendage closure device <NUM> and/or the expandable framework <NUM> is shifted to the collapsed configuration for delivery and/or disposal within the lumen <NUM> of the outer sheath <NUM>, the occlusive element <NUM> may be placed in tension and/or stretched tight along the outer surface of the expandable framework <NUM> and/or result in a portion of the expandable framework <NUM> deforming and/or buckling under the tension of the occlusive element <NUM>. The tension may be reduced by extending and/or increasing the length of the occlusive element <NUM> while keeping and/or maintaining the length of the expandable framework <NUM>. To accommodate the changes in tension, the occlusive element <NUM> may be free to move axially along the body portion of the at least some of the plurality of anchor members <NUM> extending through the occlusive element <NUM>. For example, the occlusive element <NUM> may be devoid of fixed attachment (e.g., may not be fixedly secured in place, such as with sutures or adhesives) to the plurality of anchor members <NUM> and/or the expandable framework <NUM>. The barb(s) may prevent the occlusive element <NUM> from slipping off the at least some of the plurality of anchor members <NUM> extending through the occlusive element <NUM> when the left atrial appendage closure device <NUM> and/or the expandable framework <NUM> is shifted to the deployed configuration and the tension is released or reduced.

In some embodiments, the occlusive element <NUM> may be permeable, semipermeable, or impermeable to blood and/or other fluids, such as water. In some embodiments, the occlusive element <NUM> may include a polymeric membrane, a metallic or polymeric mesh, a porous filter-like material, or other suitable construction. In some embodiments, the occlusive element <NUM> may be configured to prevent thrombi (i.e. blood clots, etc.) from passing through the occlusive element <NUM> and/or exiting the left atrial appendage into the blood stream when the left atrial appendage closure device <NUM> and/or the expandable framework <NUM> is disposed within an ostium of the left atrial appendage in the deployed configuration. In some embodiments, the occlusive element <NUM> may be configured to promote endothelization across the ostium of the left atrial appendage after implantation of the left atrial appendage closure device <NUM>, thereby effectively removing the left atrial appendage from the patient's circulatory system. Some suitable, but non-limiting, examples of materials for the occlusive element <NUM> are discussed below.

In some embodiments, the proximal hub <NUM> of the expandable framework <NUM> may be configured to releasably attach, join, couple, engage, or otherwise connect to the distal end of the delivery catheter <NUM>. In some embodiments, the left atrial appendage closure device <NUM> and/or the expandable framework <NUM> may include an insert <NUM> disposed within the proximal hub <NUM>. In some embodiments, the insert <NUM> may be configured to and/or adapted to releasably couple with, join to, mate with, or otherwise engage the distal end of the delivery catheter <NUM>, as discussed herein. In the interest of clarity, not all features of the insert <NUM> described herein are shown in <FIG>. Some of these features may be shown in more detail in other figures.

In some embodiments, the insert <NUM> may include a collar <NUM> defining a circumferential wall <NUM> of the insert <NUM> configured to engage the proximal hub <NUM>, a recess <NUM> extending axially into the insert <NUM> from a proximal end of the insert <NUM>, and a post member <NUM> disposed within the recess <NUM> radially inward of the circumferential wall <NUM>. The recess <NUM> may extend distally into the insert <NUM> from a proximal end of the insert <NUM> to a distal surface within the recess <NUM> defining a distal end of the recess <NUM>. The post member <NUM> may be radially spaced apart from the collar <NUM> and/or the circumferential wall <NUM> to define an annular gap <NUM> (e.g., <FIG>) between the post member <NUM> and the collar <NUM> and/or the circumferential wall <NUM>. The post member <NUM> may extend proximally from a distal end of the recess <NUM> and/or the distal surface within the recess <NUM> to a proximal surface <NUM> of the post member <NUM> disposed proximate the proximal end of the insert <NUM>. In some embodiments, the proximal surface <NUM> of the post member <NUM> may be disposed distal of the proximal end of the insert <NUM>. In some embodiments, the proximal surface <NUM> of the post member <NUM> may be disposed proximal of the proximal end of the insert <NUM>. In some embodiments, the proximal surface <NUM> of the post member <NUM> may be disposed substantially flush with the proximal end of the insert <NUM>.

As shown in <FIG>, the insert <NUM> may extend distally into an interior of the left atrial appendage closure device <NUM> and/or the expandable framework <NUM>. In some embodiments, the insert <NUM> may have a substantially cylindrical outer surface. In some embodiments, the insert <NUM> may be hollow and/or may include an interior space distal of the distal end of the recess <NUM> and/or the distal surface within the recess <NUM>. An overall length of the insert <NUM> may vary depending on the construction of the insert <NUM> and/or components disposed within the interior space of the insert <NUM>.

In one example configuration, as shown in <FIG>, the insert <NUM> may include one or more internal components disposed within the interior space. In some embodiments, the insert may be devoid of any internal components. As such, any and/or all of the internal components may be considered optional in any particular example. The exploded view of <FIG> is one exemplary and non-limiting configuration of the insert <NUM>. For example, the insert <NUM> may include a sensor <NUM> disposed within the insert <NUM> and/or the post member <NUM>, the sensor <NUM> being in communication with the proximal surface <NUM> of the post member <NUM>. In some embodiments, the sensor <NUM> may be a pressure sensor, the proximal surface <NUM> of the post member <NUM> may include a diaphragm extending across the proximal end of the post member <NUM>, and a pressure transfer fluid may be disposed within the post member <NUM> between the sensor <NUM> and the proximal surface <NUM> (e.g., the diaphragm). The proximal surface <NUM> (e.g., the diaphragm) and/or the pressure transfer fluid may cooperate to sense and/or transmit a fluid pressure in a space proximal of the post member <NUM> (e.g., a left atrium) and/or adjacent the proximal surface <NUM> to the sensor <NUM> when the expandable framework <NUM> is disposed within an ostium of the left atrial appendage in the delivery configuration. In some embodiments, the sensor <NUM> may be configured to sense and/or detect temperature, flow rate, heart rate, electrical signals in the heart, heart rhythm, or other characteristics.

In some embodiments, the insert <NUM> may include an integrated circuit board <NUM> for controlling the sensor <NUM> and/or other internal components of the insert <NUM>. In some embodiments, the insert <NUM> may include a communication coil <NUM> disposed within the interior space. In some embodiments, the communication coil <NUM> may be configured for bi-directional wireless communication and/or energy transfer. In some embodiments, the insert <NUM> may optionally include a battery <NUM>. In some embodiments, the insert <NUM> may be powered "on-demand" via an inductive link. In some embodiments, the communication coil <NUM> may be and/or may form a part of the inductive link. In some embodiments, the insert <NUM> may include a capacitor <NUM> disposed within the interior space configured to act as a temporary power source for the sensor <NUM> and/or other internal components of the insert <NUM> (during "on-demand" energy transfer to the left atrial appendage closure device <NUM>, for example). In some embodiments, the communication coil <NUM> may be wrapped around the battery <NUM>, as shown in <FIG>. In some embodiments, the communication coil <NUM> may be wrapped around the capacitor <NUM>. In some embodiments, the communication coil <NUM> may be a stand-alone feature and/or may be wrapped around an inert and/or non-functional structure to maintain shape and/or form. Other configurations are also contemplated.

In some embodiments utilizing the battery <NUM>, the battery <NUM> may be rechargeable. While a direct connection may be used to recharge the battery <NUM>, such a configuration may be rather invasive to the patient. Accordingly, a wireless (e.g., inductive) recharging capability may be more desirable and far less invasive to the patient. In some embodiments, utilizing the battery <NUM>, the battery <NUM> may not be rechargeable. When using a non-rechargeable battery <NUM>, it is desirable to use a battery having a lifetime at least as long as the expected remaining lifetime of the patient to avoid needing to replace the battery <NUM> during a patient's later years when surgical procedures may be more challenging.

The insert <NUM> may include a first connection structure <NUM> disposed distal of the proximal surface <NUM>. The delivery catheter <NUM> may include a second connection structure <NUM> proximate the distal end of the delivery catheter <NUM>. The second connection structure <NUM> may be configured to engage the first connection structure <NUM> in the delivery configuration of the medical system <NUM>. In some embodiments, the distal end of the delivery catheter <NUM> may include a hollow portion <NUM> configured to receive the post member <NUM> in the delivery configuration of the medical system <NUM>, as shown in <FIG> for example. For the purpose of illustration, <FIG> shows aspects of the medical system <NUM> in a released configuration with the delivery catheter <NUM> disengaged from the left atrial appendage closure device <NUM>.

In some embodiments, the first connection structure <NUM> may include a first threaded portion <NUM> disposed on an inside surface of the insert <NUM> (e.g., internal threads), as seen in <FIG>. In the example of <FIG>, the second connection structure <NUM> may include a second threaded portion <NUM> disposed proximate the distal end of the delivery catheter <NUM>. The second threaded portion <NUM> may be disposed on an outside surface of the distal end of the delivery catheter <NUM> (e.g., external threads). The second threaded portion <NUM> may be configured to threadably mate with the first threaded portion <NUM> when the medical system <NUM> is in the delivery configuration (e.g., <FIG>). In use, as the distal end of the delivery catheter <NUM> is inserted into the recess <NUM>, the second connection structure <NUM> and/or the second threaded portion <NUM> may engage with and be rotated relative to the first connection structure <NUM> and/or the first threaded portion <NUM> to further engage the second threaded portion <NUM> with the first threaded portion <NUM> distal of the proximal surface <NUM> of the post member <NUM> such that the distal end of the delivery catheter <NUM> is translated axially and/or distally into the recess <NUM> of the insert <NUM>. In the delivery configuration of the medical system <NUM>, the first threaded portion <NUM> and the second threaded portion <NUM> may prevent relative axial movement between the left atrial appendage closure device <NUM> and the delivery catheter <NUM>. The hollow portion <NUM> of the delivery catheter <NUM> may extend over and/or around the post member <NUM> such that the proximal surface <NUM> of the post member <NUM> may be protected from contact and/or damage during handling and/or implantation. In the delivery configuration of the medical system <NUM>, the delivery catheter <NUM> may not contact the proximal surface <NUM> of the post member <NUM>.

In some embodiments, the first connection structure <NUM> may include a first threaded portion <NUM> disposed on the outside surface of the post member <NUM> (e.g., external threads), as seen in <FIG>. In the example of <FIG>, the second connection structure <NUM> may include a second threaded portion <NUM> disposed proximate the distal end of the delivery catheter <NUM>. The second threaded portion <NUM> may be disposed on an inside surface of the distal end of the delivery catheter <NUM> (e.g., internal threads). For example, the second threaded portion <NUM> may be disposed on an inside surface of the hollow portion <NUM>. The second threaded portion <NUM> may be configured to threadably mate with the first threaded portion <NUM> when the medical system <NUM> is in the delivery configuration. In use, as the distal end of the delivery catheter <NUM> is inserted into the recess <NUM>, the second connection structure <NUM> and/or the second threaded portion <NUM> may engage with and be rotated relative to the first connection structure <NUM> and/or the first threaded portion <NUM> to further engage the second threaded portion <NUM> with the first threaded portion <NUM> distal of the proximal surface <NUM> of the post member <NUM> such that the distal end of the delivery catheter <NUM> is translated axially and/or distally into the recess <NUM> of the insert <NUM>. In the delivery configuration of the medical system <NUM>, the first threaded portion <NUM> and the second threaded portion <NUM> may prevent relative axial movement between the left atrial appendage closure device <NUM> and the delivery catheter <NUM>. The hollow portion <NUM> of the delivery catheter <NUM> may extend over and/or around the post member <NUM> such that the proximal surface <NUM> of the post member <NUM> may be protected from contact and/or damage during handling and/or implantation. In the delivery configuration of the medical system <NUM>, the delivery catheter <NUM> may not contact the proximal surface <NUM> of the post member <NUM>.

<FIG> illustrate selected aspects of medical system <NUM> and the insert <NUM> in more detail. As shown in <FIG> and as described herein, the insert <NUM> may include the collar <NUM> defining the circumferential wall <NUM> of the insert <NUM> configured to engage the proximal hub <NUM>, the recess <NUM> extending axially into the insert <NUM> from the proximal end of the insert <NUM>, and the post member <NUM> disposed within the recess <NUM> radially inward of the circumferential wall <NUM>. The post member <NUM> may be radially spaced apart from the collar <NUM> and/or the circumferential wall <NUM> to define the annular gap <NUM> between the post member <NUM> and the collar <NUM> and/or the circumferential wall <NUM>. For the purpose of illustration only, the insert <NUM> of <FIG> is shown with aspects of the insert <NUM> in accordance with <FIG>. However, any of the embodiments described herein may include and/or may be combined with aspects shown in <FIG>.

In at least some embodiments, the insert <NUM> may further include a gap seal <NUM> disposed in and/or extending across a proximal end of the annular gap <NUM> when the medical system <NUM> is disposed in the released configuration in which the delivery catheter <NUM> is disengaged from the left atrial appendage closure device <NUM> and/or the insert <NUM>. In some embodiments, the gap seal <NUM> may be deflectable between a first position (e.g., <FIG>) and a second position (e.g., <FIG>). When the medical system <NUM> is in the released configuration, the gap seal <NUM> may be disposed in the first position. In the first position, the gap seal <NUM> may extend from the circumferential wall <NUM> to the post member <NUM>. In the first position, the gap seal <NUM> may be in contact with both the circumferential wall <NUM> and the post member <NUM>. In the first position, the gap seal <NUM> may be configured to seal off the annular gap <NUM> and/or the recess <NUM> from the circulatory system and/or the left atrium of the patient, thereby reducing the chance of developing thrombus therein. Additionally, in some embodiments, the gap seal <NUM> may include a coating or therapeutic agent configured to promote endothelization when exposed to the circulatory system and/or the left atrium of the patient.

When the medical system <NUM> is in the delivery configuration and/or the deployed configuration, the gap seal <NUM> may be disposed in the second position. In the second position, the gap seal <NUM> may be in contact with only one of the circumferential wall <NUM> and the post member <NUM>. The gap seal <NUM> may be configured to deflect into the recess <NUM> to the second position by engagement with the distal end of the delivery catheter <NUM> and/or by engagement with the second connection structure <NUM> when the medical system <NUM> is in the delivery configuration. In the second position, the gap seal <NUM> may form a sealing engagement with an inner surface or an outer surface of the delivery catheter <NUM>.

In some embodiments, the gap seal <NUM> may be fixedly attached to the circumferential wall <NUM> or the post member <NUM>. The gap seal <NUM> may be configured to deflect radially away from the first connection structure <NUM>, as shown in <FIG>. While illustrated in <FIG> as being fixedly attached to the circumferential wall <NUM>, it is contemplated that the gap seal <NUM> could be fixedly attached to the post member <NUM> (in the configuration of <FIG>, for example). As shown in <FIG>, in the delivery configuration of the medical system <NUM>, the distal end of the delivery catheter <NUM> includes the hollow portion <NUM> configured to extend over the post member <NUM> and within the circumferential wall <NUM>. For example, the hollow portion <NUM> may be disposable within the insert <NUM> radially inward of the circumferential wall <NUM> and radially outward of the post member <NUM> in the delivery configuration of the medical system <NUM>. The distal end of the delivery catheter <NUM> may be disposed distal of the proximal end of the insert <NUM> and/or the proximal surface <NUM> of the post member <NUM>. Some suitable, but non-limiting, examples of materials for the gap seal <NUM> are discussed below.

In some embodiments, the first connection structure <NUM> may include at least one groove <NUM> formed in the outside surface of the post member <NUM>, as seen in <FIG>. In some embodiments, the at least one groove <NUM> may include two grooves, three grooves, four grooves, or more grooves as needed or desired to achieve desired operational characteristics. The at least one groove <NUM> may each include a longitudinal portion 184A and a circumferential portion 184B extending from a distal end of the longitudinal portion 184A. In some embodiments, the longitudinal portion 184A of the at least one groove <NUM> may include a proximally widening taper 184C at a proximal end, as shown in <FIG>. In the examples of <FIG>, the second connection structure <NUM> may include at least one radially extending projection <NUM> disposed proximate the distal end of the delivery catheter <NUM>. In some embodiments, the second connection structure <NUM> may include at least one radially extending projection for each groove of the first connection structure <NUM>, such that there is a corresponding and/or equal number of grooves and radially extending projections. The at least one radially extending projection <NUM> may be configured to engage the at least one groove <NUM> when the medical system <NUM> is in the delivery configuration. In use, as the distal end of the delivery catheter <NUM> is inserted into the recess <NUM>, the second connection structure <NUM> and/or the at least one radially extending projection <NUM> may engage with the first connection structure <NUM> and/or the at least one groove <NUM> as the delivery catheter <NUM> is advanced distally. Upon reaching the distal end of the longitudinal portion 184A of the at least one groove <NUM>, the delivery catheter <NUM> may be rotated relative to left atrial appendage closure device <NUM>, the insert <NUM>, and/or the post member <NUM> such that the at least one radially extending projection <NUM> is translated circumferentially within the circumferential portion 184B of the at least one groove <NUM> distal of the proximal surface <NUM> of the post member <NUM> to lock the delivery catheter <NUM> to the insert <NUM> and/or the left atrial appendage closure device <NUM> and prevent relative axial movement therebetween when the medical system <NUM> is in the delivery configuration. The hollow portion <NUM> of the delivery catheter <NUM> may extend over and/or around the post member <NUM> such that the proximal surface <NUM> of the post member <NUM> may be protected from contact and/or damage during handling and/or implantation. In the delivery configuration of the medical system <NUM>, the delivery catheter <NUM> may not contact the proximal surface <NUM> of the post member <NUM>.

In some embodiments, the first connection structure <NUM> may include at least one detent <NUM> extending radially inward from the outside surface of the post member <NUM>, as seen in <FIG>. In some embodiments, the at least one detent <NUM> may include two detents, three detents, four detents, or more detents as needed or desired to achieve desired operational characteristics. In the example of <FIG>, the second connection structure <NUM> may include at least one prong <NUM> disposed proximate the distal end of the delivery catheter <NUM>. In some embodiments, the at least one prong <NUM> may extend distally from the distal end of the delivery catheter <NUM>. The at least one prong <NUM> may be configured to engage the at least one detent <NUM> when the medical system <NUM> is in the delivery configuration. In some embodiments, the second connection structure <NUM> may include at least one prong for each detent of the first connection structure <NUM>, such that there is a corresponding and/or equal number of prongs and detents. In use, as the distal end of the delivery catheter <NUM> is inserted into the recess <NUM>, the second connection structure <NUM> and/or the at least one prong <NUM> may engage with the first connection structure <NUM> and/or the at least one detent <NUM>. The at least one prong <NUM> may extend into the at least one detent <NUM> to lock the delivery catheter <NUM> to the insert <NUM> and/or the left atrial appendage closure device <NUM> and prevent relative axial movement therebetween when the medical system <NUM> is in the delivery configuration. In some embodiments, the hollow portion <NUM> of the delivery catheter <NUM> may extend over and/or around the post member <NUM> such that the proximal surface <NUM> of the post member <NUM> may be protected from contact and/or damage during handling and/or implantation. In the delivery configuration of the medical system <NUM>, the delivery catheter <NUM> may not contact the proximal surface <NUM> of the post member <NUM>.

In some embodiments, the first connection structure <NUM> may include at least one projection <NUM> extending radially outward from the outside surface of the post member <NUM>, as seen in <FIG>. In some embodiments, the at least one projection <NUM> may include two projections, three projections, four projections, or more projections as needed or desired to achieve desired operational characteristics. In the example of <FIG>, the second connection structure <NUM> may include two or more movable jaws <NUM> disposed proximate the distal end of the delivery catheter <NUM>. In some embodiments, the two or more movable jaws <NUM> may extend distally from the distal end of the delivery catheter <NUM>. The two or more movable jaws <NUM> may be configured to engage the at least one projection <NUM> when the medical system <NUM> is in the delivery configuration. In use, as the distal end of the delivery catheter <NUM> is inserted into the recess <NUM>, the second connection structure <NUM> and/or the two or more movable jaws <NUM> may engage with the first connection structure <NUM> and/or the at least one projection <NUM>. The two or more movable jaws <NUM> may be actuatable to clamp the post member <NUM> between the two or more movable jaws <NUM> distal of the proximal surface <NUM> of the post member <NUM> to lock the delivery catheter <NUM> to the insert <NUM> and/or the left atrial appendage closure device <NUM> and prevent relative axial movement therebetween when the medical system <NUM> is in the delivery configuration. In the delivery configuration of the medical system <NUM>, the delivery catheter <NUM> may not contact the proximal surface <NUM> of the post member <NUM>.

In some embodiments, the first connection structure <NUM> may include a channel <NUM> formed in and/or extending radially into the outside surface of the post member <NUM> and extending circumferentially around the post member <NUM> distal of the proximal surface <NUM>, as seen in <FIG>. The channel <NUM> may open radially outward from the central longitudinal axis of the insert <NUM> and/or the left atrial appendage closure device <NUM>. In some embodiments, the channel <NUM> may be continuous or discontinuous around the post member <NUM> as needed or desired to achieve desired operational characteristics. The channel <NUM> may define a narrowed neck of the post member <NUM>, wherein the proximal surface <NUM> is disposed on a head of the post member <NUM> proximal of the neck, the head having a greater outer diameter than the neck. In at least some embodiments, the head may include a notch <NUM> extending radially inward from an outer perimeter of the head to the narrowed neck.

In the example of <FIG>, the second connection structure <NUM> may include a distal cap member <NUM> having the hollow portion <NUM> formed therein disposed proximate and/or at the distal end of the delivery catheter <NUM> and configured to span the proximal surface <NUM> of the post member <NUM>. In some embodiments, the distal cap member <NUM> may include at least one aperture <NUM> formed in and/or through a laterally and/or radially extending surface of the distal cap member <NUM>. The second connection structure <NUM> may further include a tether <NUM> extending longitudinally through the lumen <NUM> of the outer sheath <NUM> and/or alongside the delivery catheter <NUM>, through the at least one aperture <NUM>, and around the post member <NUM> in the delivery configuration of the medical system <NUM>. In some embodiments, the tether <NUM> may extend into and/or through the hollow portion <NUM>.

In use, the tether <NUM> may extend through the notch <NUM> and around the post member <NUM> in the channel <NUM> to secure the left atrial appendage closure device <NUM> to and/or against the distal cap member <NUM> of the delivery catheter <NUM> and prevent relative axial movement therebetween when the medical system <NUM> is in the delivery configuration. In some embodiments, the hollow portion <NUM> of the delivery catheter <NUM> and/or the distal cap member <NUM> may extend over and/or around the post member <NUM> such that the proximal surface <NUM> of the post member <NUM> may be protected from contact and/or damage during handling and/or implantation. In the delivery configuration of the medical system <NUM>, the delivery catheter <NUM> may not contact the proximal surface <NUM> of the post member <NUM>. Having the tether <NUM> extend through the notch <NUM> may permit a reduced tolerance and/or spacing between the hollow portion <NUM> and the head of the post member <NUM> in the delivery configuration.

In some embodiments, the first connection structure <NUM> may include a channel <NUM> formed in and/or extending radially into the outside surface of the post member <NUM> and extending circumferentially around the post member <NUM> distal of the proximal surface <NUM>, as seen in <FIG>. The channel <NUM> may open radially outward from the central longitudinal axis of the insert <NUM> and/or the left atrial appendage closure device <NUM>. In some embodiments, the channel <NUM> may be continuous or discontinuous around the post member <NUM> as needed or desired to achieve desired operational characteristics. The channel <NUM> may define a narrowed neck of the post member <NUM>, wherein the proximal surface <NUM> is disposed on a head of the post member <NUM> proximal of the neck, the head having a greater outer diameter than the neck. In at least some embodiments, the head may include two notches <NUM> extending radially inward from an outer perimeter of the head to the narrowed neck.

In some embodiments, and as illustrated in <FIG>, the insert <NUM> may be devoid of the collar <NUM> and/or the circumferential wall <NUM>. For example, the post member <NUM> may extend proximally from the insert <NUM> without any surrounding feature(s). Other configurations are also contemplated, and the first connection structure <NUM> and the second connection structure <NUM> of <FIG> may be used in conjunction with the insert <NUM>, the collar <NUM>, and/or the circumferential wall <NUM> shown in other examples.

In the example of <FIG>, the second connection structure <NUM> may include two movable jaws <NUM> disposed proximate the distal end of the delivery catheter <NUM>. In some embodiments, the two movable jaws <NUM> may extend within and distally from the distal end of the delivery catheter <NUM>. In some embodiments, the medical system <NUM> may be devoid of the delivery catheter <NUM> and the second connection structure <NUM> may be slidably disposed directly within the outer sheath <NUM>. In some embodiments, the second connection structure <NUM> may include an elongate shaft portion <NUM> extending proximally from the two movable jaws <NUM> within the outer sheath <NUM>. Each of the two movable jaws <NUM> may include an engagement element <NUM> extending radially inward from its jaw <NUM> that is curved, arced, and/or semi-circular in shape. In some embodiments, the two movable jaws <NUM> may be movably and/or pivotably joined together at a hinge point <NUM> proximal of the engagement element(s) <NUM>, to permit relative movement of the engagement elements <NUM> in radially opposite directions. The elongate shaft portion <NUM> may extend proximally from the hinge point <NUM> and/or the hinge point <NUM> may distinguish the two movable jaws <NUM> from the elongate shaft portion <NUM>.

The two movable jaws <NUM> and the engagement element(s) <NUM> may be configured to engage the channel <NUM> and the two notches <NUM> when the medical system <NUM> is in the delivery configuration. Each of the two notches <NUM> may correspond to and/or may be configured to engage one of the two movable jaws <NUM>, and engagement of the two movable jaws <NUM> with the two notches <NUM> may prevent relative rotation between the first connection structure <NUM> and the second connection structure <NUM>.

The two movable jaws <NUM> may be actuatable to clamp the post member <NUM> between the two movable jaws <NUM> distal of the proximal surface <NUM> of the post member <NUM> (e.g., within the channel <NUM>) to lock the elongate shaft <NUM> to the insert <NUM> and/or the left atrial appendage closure device <NUM> and prevent relative axial movement therebetween when the medical system <NUM> is in the delivery configuration. In the delivery configuration of the medical system <NUM>, the elongate shaft <NUM>, the two movable jaws <NUM>, and/or the engagement element(s) <NUM> may not contact the proximal surface <NUM> of the post member <NUM>.

Other means of releasably coupling and/or engaging the expandable framework <NUM> to the distal end of the delivery catheter <NUM> are also contemplated.

In addition or alternatively to any configuration described herein, the delivery catheter <NUM> may include at least one aperture <NUM> extending through a side wall of the delivery catheter <NUM> into the hollow portion <NUM> proximate the distal end of the delivery catheter <NUM>, as shown in <FIG>. In the delivery configuration, the at least one aperture <NUM> may be disposed proximal of the insert <NUM> and/or the proximal surface <NUM> of the post member <NUM>. The at least one aperture <NUM> may permit fluid communication between an exterior of the delivery catheter <NUM> and the proximal surface <NUM> of the post member <NUM> when the medical system <NUM> is in the delivery configuration. This may be useful when the practitioner wants to detect and/or measure left atrial pressure and/or other characteristics with the sensor <NUM> prior to releasing the left atrial appendage closure device <NUM>.

The materials that can be used for the various components of the medical system <NUM> and/or the left atrial appendage closure device <NUM> and the various elements thereof disclosed herein may include those commonly associated with medical devices. For simplicity purposes, the following discussion refers to the medical system <NUM> and/or the left atrial appendage closure device <NUM>. 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 delivery catheter <NUM>, the outer sheath <NUM>, the expandable framework <NUM>, the plurality of anchor members <NUM>, the occlusive element <NUM>, the insert <NUM>, and/or elements or components thereof.

In some embodiments, the medical system <NUM> and/or the left atrial appendage closure device <NUM>, and/or components thereof, 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 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-<NUM> (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, polyurethane silicone copolymers (for example, ElastEon® from Aortech Biomaterials or ChronoSil® from AdvanSource Biomaterials), 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 <NUM> percent LCP.

Some examples of suitable metals and metal alloys include stainless steel, such as 304V, <NUM>, and 316LV 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® <NUM>, UNS: N06022 such as HASTELLOY® C-<NUM>®, UNS: N10276 such as HASTELLOY® C276®, other HASTELLOY® alloys, and the like), nickel-copper alloys (e.g., UNS: N04400 such as MONEL® <NUM>, NICKELVAC® <NUM>, NICORROS® <NUM>, and the like), nickel-cobalt-chromium-molybdenum alloys (e.g., UNS: R30035 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: R30003 such as ELGILOY®, PHYNOX®, and the like); platinum enriched stainless steel; titanium; platinum; palladium; gold; combinations thereof; or any other suitable material.

Both 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 <NUM> to <NUM> percent strain before plastically deforming.

In at least some embodiments, portions or all of the medical system <NUM> and/or the left atrial appendage closure device <NUM>, 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 the user of the medical system <NUM> and/or the left atrial appendage closure device <NUM> in determining its location. 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 medical system <NUM> and/or the left atrial appendage closure device <NUM> to achieve the same result.

In some embodiments, a degree of Magnetic Resonance Imaging (MRI) compatibility is imparted into the medical system <NUM> and/or the left atrial appendage closure device <NUM> and/or other elements disclosed herein. For example, the medical system <NUM> and/or the left atrial appendage closure device <NUM>, and/or components or portions thereof, may be made of a material that does not substantially distort the image and create substantial artifacts (i.e., gaps in the image). Certain ferromagnetic materials, for example, may not be suitable because they may create artifacts in an MRI image. The medical system <NUM> and/or the left atrial appendage closure device <NUM>, 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: R30003 such as ELGILOY®, PHYNOX®, and the like), nickel-cobalt-chromium-molybdenum alloys (e.g., UNS: R30035 such as MP35-N® and the like), nitinol, and the like, and others.

In some embodiments, the medical system <NUM> and/or the left atrial appendage closure device <NUM> and/or other elements disclosed herein may include a fabric material disposed over or within the structure. The fabric material may be composed of a biocompatible material, such a polymeric material or biomaterial, adapted to promote tissue ingrowth. In some embodiments, the fabric material may include a bioabsorbable material. Some examples of suitable fabric materials include, but are not limited to, polyethylene glycol (PEG), nylon, polytetrafluoroethylene (PTFE, ePTFE), a polyolefinic material such as a polyethylene, a polypropylene, polyester, polyurethane, and/or blends or combinations thereof.

In some embodiments, the medical system <NUM> and/or the left atrial appendage closure device <NUM> and/or other elements disclosed herein may include and/or be formed from a textile material. Some examples of suitable textile materials may include synthetic yarns that may be flat, shaped, twisted, textured, pre-shrunk or un-shrunk. Synthetic biocompatible yarns suitable for use in the present invention include, but are not limited to, polyesters, including polyethylene terephthalate (PET) polyesters, polypropylenes, polyethylenes, polyurethanes, polyolefins, polyvinyls, polymethylacetates, polyamides, naphthalene dicarboxylene derivatives, natural silk, and polytetrafluoroethylenes. Moreover, at least one of the synthetic yarns may be a metallic yarn or a glass or ceramic yarn or fiber. Useful metallic yarns include those yarns made from or containing stainless steel, platinum, gold, titanium, tantalum or a Ni-Co-Cr-based alloy. The yarns may further include carbon, glass or ceramic fibers. Desirably, the yarns are made from thermoplastic materials including, but not limited to, polyesters, polypropylenes, polyethylenes, polyurethanes, polynaphthalenes, polytetrafluoroethylenes, and the like. The yarns may be of the multifilament, monofilament, or spun-types. The type and denier of the yarn chosen may be selected in a manner which forms a biocompatible and implantable prosthesis and, more particularly, a vascular structure having desirable properties.

In some embodiments, the medical system <NUM> and/or the left atrial appendage closure device <NUM> and/or other elements disclosed herein may include and/or be treated with a suitable therapeutic agent. Some examples of suitable therapeutic agents may include anti-thrombogenic agents (such as heparin, heparin derivatives, urokinase, and PPack (dextrophenylalanine proline arginine chloromethylketone)); anti-proliferative agents (such as enoxaparin, angiopeptin, monoclonal antibodies capable of blocking smooth muscle cell proliferation, hirudin, and acetylsalicylic acid); anti-inflammatory agents (such as dexamethasone, prednisolone, corticosterone, budesonide, estrogen, sulfasalazine, and mesalamine); antineoplastic/antiproliferative/anti-mitotic agents (such as paclitaxel, <NUM>-fluorouracil, cisplatin, vinblastine, vincristine, epothilones, endostatin, angiostatin and thymidine kinase inhibitors); anesthetic agents (such as lidocaine, bupivacaine, and ropivacaine); anti-coagulants (such as D-Phe-Pro-Arg chloromethyl keton, an RGD peptide-containing compound, heparin, anti-thrombin compounds, platelet receptor antagonists, anti-thrombin antibodies, anti-platelet receptor antibodies, aspirin, prostaglandin inhibitors, platelet inhibitors, and tick antiplatelet peptides); vascular cell growth promoters (such as growth factor inhibitors, growth factor receptor antagonists, transcriptional activators, and translational promoters); vascular cell growth inhibitors (such as growth factor inhibitors, growth factor receptor antagonists, transcriptional repressors, translational repressors, replication inhibitors, inhibitory antibodies, antibodies directed against growth factors, bifunctional molecules consisting of a growth factor and a cytotoxin, bifunctional molecules consisting of an antibody and a cytotoxin); cholesterol-lowering agents; vasodilating agents; and agents which interfere with endogenous vasoactive mechanisms.

Claim 1:
A medical system (<NUM>), comprising:
a left atrial appendage closure device (<NUM>) including an expandable framework (<NUM>) and a proximal hub (<NUM>) centered on a central longitudinal axis of the expandable framework (<NUM>);
wherein an insert (<NUM>) is disposed within the proximal hub (<NUM>), the insert including a collar (<NUM>) configured to engage the proximal hub (<NUM>), a recess (<NUM>) extending into the insert (<NUM>) from a proximal end of the insert (<NUM>), and a post member (<NUM>) disposed within the recess (<NUM>);
wherein the post member (<NUM>) is radially spaced apart from the collar (<NUM>) to define a gap between the post member (<NUM>) and the collar (<NUM>), and the post member (<NUM>) extends proximally from a distal end of the recess (<NUM>) to a proximal surface (<NUM>);
wherein the insert (<NUM>) includes a first connection structure (<NUM>) disposed distal of the proximal surface (<NUM>);
and
a delivery catheter (<NUM>) having a second connection structure (<NUM>) proximate a distal end of the delivery catheter (<NUM>), the second connection structure (<NUM>) being configured to engage the first connection structure (<NUM>) in a delivery configuration of the medical system;
wherein the distal end of the delivery catheter (<NUM>) includes a hollow portion (<NUM>) configured to receive the post member (<NUM>) in the delivery configuration.