Patent Description:
In most cardiovascular procedures, a catheter is inserted into an artery, such as the femoral artery, either directly or through a percutaneous vascular access. The catheter may be inserted, typically over a guidewire, directly into an artery (a "bareback" procedure), or the catheter may be inserted through a vascular introducer. When the procedure is complete, the physician removes the catheter and then removes the introducer from the vessel (if one was used). The physician then must prevent or limit the amount of blood that leaks through the vascular access. Physicians currently use a number of methods to close the vascular access, such as localized external compression, suture-mediated closure devices, plugs, gels, foams and similar materials.

However, such closure procedures may be time consuming, and may consume a significant portion of the time of the procedure. In addition, existing methods are associated with complications such as hematoma or thromboses. Still further, some of such procedures, particularly suture-mediated closure devices, are known to have high failure rates in the presence of common vascular disease such as atherosclerosis and calcification.

<CIT> tries to overcome the above-mentioned problems by introducing a semi-automated closure apparatus. The suggested closure apparatus is provided for delivering a closure element into engagement with tissue adjacent an opening into a body lumen. The apparatus includes a sheath including a lumen extending between its proximal and distal ends, and a locator member disposed within the sheath, the locator member having a distal portion extending distally beyond the distal end of the sheath. One or more positioning elements are provided on the distal portion of the locator member, the positioning elements being selectively expandable between a substantially axial collapsed configuration and a substantially transverse expanded configuration.

Even though <CIT> provides some relief for the patient by reducing the time necessary for performing a vascular closure, there appears to be room for further improvement in regards to rapid vascular closure, specifically in regards to a device that is easy to use.

Further attention is drawn to <CIT>, <CIT>, <CIT>, <CIT> and <CIT>.

In view of above-mentioned and other drawbacks of the prior art, there is therefore provided a vascular closure device according to claim <NUM>.

According to the present disclosure, the vascular closure device may be used percutaneously at a vascular access site used for a diagnostic or therapeutic intervention. A vascular access site may in some embodiments correspond to the expression "the passage through tissue proximate to a blood vessel". Engagement members are then be placed and released through the vascular closure device and attach to the tissue proximate to the blood vessel, however without engaging a wall portion of the blood vessel. The engagement members are subsequently released out from the vascular closure device using the deployment member, by using pusher rods arranged in independent lumens comprised with the vascular closure device. A pusher assembly is arranged in a common lumen that simultaneously deploys all engagement members, through a spring-loaded mechanism or by means of similar functionality. The engagement members are connected with an elongate flexible tension element, in the form of sutures. The sutures are individually connected to each engagement member. The tissue in proximity to the blood vessel is then pulled together with the sutures connected to the engagement members. When pulled together, the distance between the initial positions where the engagement members have been positioned to engage with the tissue will be reduced, thereby closing the passage, e.g. the mentioned vascular access site. The tightening accordingly creates a tissue lock thereby closing the passage in the tissue proximate to the blood vessel and indirectly closing the passage in the blood vessel/artery.

Advantages with the present disclosure include the possibility of closing large passages, such as a large bore access site, post-procedure, and that no preparation of the access site for percutaneous closure is necessary prior to the time of closure, being of high importance e.g. during acute cases. The present disclosure is however not limited to large bore holes, also small passages/holes can be closed with the present vascular closure device.

In addition to the above, it should specifically be understood that the blood vessel is not engaged directly and thus not included when closing the passage in the tissue proximate the blood vessel, rather, only the tissue proximate to the blood vessel is used for closing the passage. This may typically avoid complications involved with diseased vessels, such as dissection of the intimal layer that can occur and that might cause thrombosis, or such calcified plaques may be present and prevent penetration of the arterial wall. Furthermore, the proposed vascular closure device replaces an established invasive, manual surgical procedure with an automatized, minimally invasive, and easy to learn closure method.

The terms "proximal" and "distal" are used herein with reference to a clinician manipulating the vascular closure device. The term "proximal end" referring to the portion closest to the clinician and the term "distal end" referring to the portion located away from the clinician. It will be further appreciated that, for convenience and clarity, spatial terms such as "vertical", "horizontal", "up", and "down" may be used herein with respect to the drawings. However, the vascular closure device may be used in many orientations and positions, and these terms are not intended to be limiting and/or absolute.

It is in some embodiments possible to adapt the engagement member to mechanically engage (or anchor into) the tissue, possibly at a predetermined distance from the distal end of the vascular closure device. The predetermined distance may in one embodiment be as small as only a few millimeters.

In one embodiment, the first and the second engagement members are adapted to engage with a fascia membrane of said tissue. The fascia membrane is made up of fibrous connective tissue containing closely packed bundles of collagen fibers oriented in a wavy pattern. The fascia membrane is consequently flexible and able to resist great unidirectional tension forces until the wavy pattern of fibers has been straightened out by the pulling force. Adapting the vascular closure device such that the first and the second engagement members are adapted to engage with the fascia membrane of said tissue is thus, in some embodiments, considered suitable for further enhancing the closure of the passage to the blood vessel. The structure of the fascia membrane may additionally allow for the distance reduction, as mentioned above, to be performed without risking that the first and the second engagement members dislocate/disengage from the tissue.

In an embodiment of the present disclosure, the vascular closure device further comprises an anvil member to be used for determining a location of the anterior wall of the blood vessel/artery, and thereby to be used for providing a reference point in relation to the blood vessel. By means of such an implementation, it may be possible to allow the first and the second engagement members to successfully engage with said tissue at a predetermined distance from anvil member. In a possible embodiment, the distal end of the elongated housing may be positioned e.g. a few millimeters above the fascia membrane, typically not in contact with the fascia membrane or the wall position of the blood vessel.

In addition to providing a reference point to the engagement members, the anvil member may additionally be used for controlling bleeding during the procedure. However, it should be understood that it of course may be possible to include a further hemostasis member adapted to block blood flow through the passage in the fascia, blood vessel or both, where the hemostasis member is positioned within the blood vessel prior to deploying the first and the second engagement member.

As mentioned above, the anvil member may provide an orientation in relation to the blood vessel, possibly in a two-dimensional orientation (x-y) in relation to the blood vessel. This may further allow for the first and the second engagement member to mechanically capture or otherwise be secured to the tissue with a predetermined pattern in relation to the blood vessel.

The anvil member may for example comprise one of a balloon, a deployable disk, a deployable positioning feature or an anchoring plate, depending on the selected implementation of the vascular closure device. Similar anvil members are of course possible. In addition, it is in accordance with the present disclosure possible to remove the anvil member from blood vessel in completing the procedure involving the vascular closure device, leaving nothing behind in the artery. The anvil member may for example be arranged to form part of the elongated housing.

As an alternative to using the anvil member for providing a reference point in relation to the blood vessel, it could be possible to adapt the vascular closure device to instead comprise a small port on the distal end of the device, which communicates with a lumen that extends an external port near the proximal end of the device. The operator of the vascular closure device may then determine the reference point by inserting the vascular closure device until blood is seen coming from the proximal port, thereby indicating that the distal port is just inside the blood vessel and blood pressure is forcing blood through the vascular closure device.

The vascular closure device may additionally further comprise a device-positioning member to be aligned with a longitudinal axis of the blood vessel prior to deploying the first and the second engagement member. Such a device positioning member may for example be implemented using an extendable portion of the housing, where the device positioning member is to be aligned e.g. with a limb (e.g. leg or arm) where the passage is located.

As mentioned above, it is possible to allow a suture to be connected to the first and the second engagement member, wherein the retraction member is adapted to retract the suture to reduce the distance between the first and the second engagement member. A single suture may be used connect to all of the engagement members, or alternatively the suture and a corresponding further suture may be individually connected to the first and the second engagement member, respectively. It should be understood that it may be possible, and within the scope of the present disclosure, to include e.g. a third and a fourth (or even further) engagement members, where a single or a plurality of sutures may be connected to the engagement members in a similar manner as mentioned. Alternatively, a separate suture may be attached to each engagement member and routed into a lumen through the distal aspect of the device such that applying tension to the sutures serves to pull the fascia attachments toward the vascular closure device, reduce the distance between the engagement members and thereby close the passage.

In some embodiments, it may be suitable to form the suture/sutures from a biodegradable or bio-absorbable material, such as a bio-absorbable polymer. In addition, also the engagement member may be formed from a similar biodegradable or bio-absorbable material. This will allow post handling of the closure site to be simplified as no further engagement is needed for removing the engagement members/suture(s).

The vascular closure device is further adapted to comprise a locking member arranged with the elongated housing and adapted to maintain the suture in a retracted state, thereby creating the above-mentioned tissue lock. In addition, the locking member may be formed from a similar biodegradable and bio-absorbable material. The locking arrangement may for example be formed from a wire or similar encircling a bundle of collected sutures, in case of using individual sutures for each of the engagement members or in case of a suture looped by the plurality of engagement members, thus forming two end portions of the suture to be bundled together. The locking member is formed from a preloaded fixation ring, sleeve or coil arranged to clench and secure the tightened suture relative to each other in the retracted state.

Accordingly, when providing individual sutures to each of the engagement members (or using the mentioned two end portions of a looped single suture), the plurality of sutures (or suture end portions) may be routed into the center of a lumen that protrudes distally from the main housing of the vascular closure device. The locking member, such as the suture retention coil, may in such an embodiment initially be placed over the outer diameter of this lumen, and to be preloaded or pre-stretched such that the coil collapses to a smaller diameter when it is displaced off the distal tip of the lumen and contracts onto the sutures and thereby serves to prevent relative motion of the two or more sutures. The suture retention coil may be deployed, at the appropriate time, by distally sliding another tube that is external to the lumen on which the suture retention coil is preloaded such that the outer tube pushes the coil off the inner tube and enables it to contract onto the plurality of sutures. The suture retention coil may consist of two or more coil windings; in another embodiment three to four coil windings, in a helical configuration. In a possible embodiment, the wire used to construct the coil may not be of round cross section and may have edges or angles to increase friction with the suture.

Furthermore, the engagement member (such as the first and the second and further engagement members) may be formed in a structure corresponding to one of a barb, a hook, a needle, an anchor and a spear to mechanically capture the tissue, possibly including the fascia membrane, to provide a suitable connection point for allowing the retraction member to subsequently reduce the distance between the engagement members.

The engagement members may alternatively comprise an anchor (or be formed in a manner providing a corresponding functionality), where the anchor may be arranged as a flexible structure. Still further, the anchor may be adapted to rotate, pivot or expand once in engaged connection with said tissue, possibly including the fascia membrane, thereby further enhancing mechanical capturing of such an anchor within the tissue in some cases. In an alternative embodiment, it is possible to adapt the anchor to expand after being pushed into the fascia membrane.

For example, the anchor may be adapted to have an umbrella like shape in the collapsed position as it passes through the fascia membrane, and then either a stored spring force or tension on the suture could cause it to expand into a reverse-conical configuration, similar to an open umbrella, so that it presents much more surface area to the fascia than did the anchor in the original configuration, and thereby provides increased retention strength in the fascia. In addition, the engagement members may also comprise a hypotube section having an inclined end portion, as will be further discussed below in relation to the detailed description of the present disclosure.

The skilled addressee will realize that different features of the present disclosure may be combined to create embodiments other than those described in the following, without departing from the scope of the present disclosure.

The various aspects of the disclosure, including its particular features and advantages, will be readily understood from the following detailed description and the accompanying drawings, in which:.

The present disclosure will now be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the disclosure are shown.

Turning now to the drawings and to <FIG> in particular, the vascular closure device <NUM> is introduced percutaneously over a guide wire <NUM> into the blood vessel/artery <NUM>, through the skin <NUM> and the fascia lata <NUM> of a patient. An optional anvil member <NUM> is arranged inside the blood vessel <NUM> to create a reference point to the engagement members <NUM> and/or for controlling bleeding. The engagement members <NUM> may then be placed and released through the vascular closure device <NUM> and may attach to tissue proximate to the blood vessel <NUM> and may involve the fascia membrane <NUM> (fascia iliacus), but not a wall of the blood vessel <NUM>. The engagement members <NUM> may for example be pushed out of the vascular closure device <NUM> and into the fascia membrane <NUM> using deployment members provided as pusher rods <NUM> arranged in independent lumens provided with the vascular closure device <NUM>, for example through a pusher assembly in a common lumen that simultaneously deploys all engagement members <NUM>, through a spring-loaded mechanism or similar. The engagement members <NUM> are preferably connected with a single or a plurality of sutures as will be further elaborated below. In <FIG> there is further shown a femoral vein <NUM>, a femoral nerve <NUM> and adjacent/interstitial tissues <NUM>.

With further reference to <FIG>, the above-mentioned suture <NUM> may for example be routed through each of the engagement members <NUM> in sequence. In particular, one suture <NUM> may be looped through each of the engagement members <NUM> in sequence, or a separate suture <NUM> may be attached to each engagement member <NUM>. The tissue, e.g. fascia membrane <NUM>, is then pulled together with the suture <NUM> connected to the engagement members <NUM>. When pulled together, the tissue/fascia membrane <NUM> is tightened towards the center and creates a tissue lock, thereby indirectly closing the artery <NUM>. That is, a distance between the initial position of the engagement members <NUM> and a distance between the engagement members once the engagement members <NUM> have been moved towards each other is thereby reduced. When tightening the fascia membrane <NUM> the anvil member <NUM> may be removed from the artery <NUM>.

Referring to <FIG>, an embodiment of a closure sequence is shown whereby a passage through a wall of a vessel such as the blood vessel shown is treated such that leakage of blood from the interior volume of the blood vessel (not shown) is slowed or stopped to a clinically acceptable degree. As seen in <FIG>, a passage in the wall of the blood vessel, specifically, the femoral artery <NUM>, is disposed in general alignment with a passage through the tissue layer disposed proximate to an outer surface of the femoral artery <NUM>. For this particular exemplary embodiment, the tissue layer disposed outside of and proximate to the outer surface of the femoral artery <NUM> is the fascia iliacus <NUM>. For purposes of this general discussion, the phrase "in general alignment" as applied to the respective passages may mean at least that an appropriately sized elongate device such as a catheter or sheath may pass through both passages without significant relative lateral displacement between the tissue <NUM> and artery <NUM>. In addition, in some cases, the tissue layer <NUM> may be disposed sufficiently proximate the outside surface of the blood vessel <NUM> such that gathering and approximation of the tissue <NUM> which is disposed about the passage through the tissue <NUM> so as to close the passage through the tissue/fascia membrane <NUM> and form a tissue lock is sufficient to tighten and displace the closed gathered tissue/fascia membrane <NUM> against the outer surface of the artery <NUM> which is adjacent the passage through the artery <NUM> as shown in <FIG>. When the gathered tissue <NUM> has been displaced and deflected so as to be disposed against the passage of the artery <NUM> and wall of the artery <NUM> disposed about the passage in the artery <NUM>, this mechanical approximation will typically be sufficient in order to achieve a clinically sufficient slowing or stoppage of blood leakage from the passage in the artery <NUM> in order to permit closure of an access site through the patient's skin <NUM> adjacent the passages. In some instances, an inner surface of the tissue layer <NUM> disposed proximate to the outer surface of the blood vessel <NUM> may be separated from the outer surface of the blood vessel in the region of the respective passages therethrough by a distance of up to about <NUM>, more specifically, up to about <NUM>.

With further reference to <FIG>, there is conceptually illustrated an engagement member, exemplified as an anchor element <NUM>. In <FIG>, the anchor element <NUM> is shown as initially deployed, so that it slides easily in the direction away from a deployment point. Note that the deployment point may optionally be deflected toward the tissue/fascia membrane <NUM> to promote engagement. <FIG> shows the anchor element <NUM> after motion has been reversed toward the deployment point, and the anchor element <NUM> has embedded into the tissue/fascia membrane <NUM>. That is, a tip <NUM> of the anchors element <NUM> is in one embodiment hook-shaped, so that it easily slides outward without engaging the tissue/fascia membrane <NUM>. However, once the anchor element <NUM> is retracted, at least the tip <NUM> of the anchor element <NUM> is adapted to mechanically engage with the tissue/fascia membrane <NUM>.

<FIG> conceptually illustrate the operation of an anvil member exemplified as a deployable positioning feature <NUM>. In <FIG>, deployable positioning feature <NUM> is inserted through the wall <NUM> and into the interior volume of the blood vessel, such as the femoral artery <NUM>. The deployable positioning feature <NUM> is structured similar to an umbrella (using a mesh material), where the deployable positioning feature <NUM> in a radially collapsed form may be inserted into the artery <NUM>. Once within the artery <NUM>, with further reference to <FIG>, the deployable positioning feature <NUM> may be "unfolded" and radially expanded from the collapsed form such that a total surface area proximate to the longitudinal axis of the deployable positioning feature <NUM> is increased and thus may be retracted towards the interior wall of the artery <NUM>. Accordingly, a reference point may be thereby established for further operation of the vascular closure device.

<FIG>, in conjunction with <FIG>, describe, in step-by-step fashion, the use of a vascular closure device <NUM> according to a second aspect of the present disclosure. The first step, as shown in <FIG>, the vascular closure device <NUM> is provided, S1, in the deployment is to advance the vascular closure device <NUM> over e.g. a pre-existing guidewire <NUM> until the conical distal tip <NUM> (possibly provided with a conical nosecone) of an elongated housing <NUM> of the vascular closure device <NUM> is positioned, S2, and the pusher rods exit the housing proximate to the fascia membrane <NUM> above an outer surface of a wall the artery <NUM>, as is shown in <FIG>. Optionally, the vascular closure device <NUM> may be aligned such that a longitudinal marker on the vascular closure device <NUM> (as will be further discussed below in relation to <FIG>, is approximately aligned with the longitudinal axis of the common artery <NUM> of the patient.

In this embodiment, one suture <NUM> for each engagement member <NUM> is initially routed through the center of the vascular closure device <NUM>, out the distal tip, and up alongside the outer surface of the vascular closure device <NUM> and into the slot on the elongated housing <NUM> containing the undeployed engagement members <NUM>. Thus, when the engagement members <NUM> are deployed, S3, as shown in <FIG>, the retraction member pulls the suture <NUM> that is routed from the distal tip <NUM> of the vascular closure device <NUM>, up through the (pre-existing) hole in the fascia <NUM>, and outward to the location of the engagement members <NUM>, as shown in <FIG>.

Once a retraction force is applied by the retraction member, S4, and the direction of is reversed, the engagement members <NUM> will mechanically engage the tissue/fascia membrane <NUM>, as shown in <FIG>, and the pusher rods <NUM> (i.e. the deployment member) is withdrawn back into the slots, holes or lumens in the elongated housing <NUM> of the vascular closure device <NUM> from which they originally extended.

At this stage, a plurality of engagement members <NUM> (e.g. four, or any other number of engagement members, also an odd number of engagement members is possible) will be embedded in and secured to the tissue/fascia membrane <NUM> at locations circumferentially disposed around the passage to be closed in the tissue/fascia membrane <NUM> at positions on each side of the common femoral artery <NUM>. In some cases, the engagement members <NUM> may be symmetrically disposed bilaterally on the medial and lateral sides of the common femoral artery <NUM>. Each of the engagement members <NUM> has a suture <NUM> connected, and that suture <NUM> runs from the anchor, down through the hole in the fascia <NUM>, and into the distal tip <NUM> of the vascular closure device <NUM>.

Next, initial tension is applied to the sutures to pull the engagement members <NUM> (and thus the fascia <NUM>) toward the vascular closure device <NUM>. Now the vascular closure device <NUM> may be slowly withdrawn until the distal tip <NUM> is at or just above the fascia layer <NUM>, keeping tension on the sutures <NUM> to continue to pull the engagement members <NUM> together toward the distal tip <NUM> of the vascular closure device <NUM>, thereby pulling all the engagement members <NUM> toward one point and closing the passage, as shown in <FIG>.

At this point, a locking member, such as a fixation ring <NUM> or sleeve, through which each of the sutures <NUM> passes, is deployed from the distal tip <NUM> of the vascular closure device <NUM>, as shown in <FIG>. This fixation ring <NUM> compresses onto the bundle of multiple sutures <NUM> and locks them in place, thereby preventing the fascia membrane <NUM> and thus the passage from reopening, thereby indirectly closing the artery <NUM>. Furthermore, as a desired level of hemostasis is achieved, also the guidewire <NUM> may be removed while holding tension on the sutures <NUM>. The guidewire <NUM> may be for example routed alongside of, but not through, the fixation ring <NUM>. This may allow the sutures <NUM> to be fully retracted and the fixation ring 508to be deployed to lock the sutures <NUM> in place without removing the guidewire <NUM>.

This fixation ring <NUM> may be spring-like, held open only by its mounting on the vascular closure device <NUM>, such that it automatically closes down on the sutures <NUM> after being deployed from the vascular closure device <NUM>. Alternatively, this locking ring function could be accomplished by another suture loop with a pre-tied knot that is cinched down to anchor the other sutures that are connected to the anchors. In yet another embodiment of the fixation ring <NUM> could be a fusion mechanism that uses heat and/or pressure to fuse the sutures together to provide fixation. In yet another embodiment a fixation ring could be a small tube through which sutures are initially and slidably routed, said tube being compressed by a mechanism in the housing to trap sutures and create fixation.

The vascular closure device <NUM> removal may be continued at this stage, as the passage closure is complete, as shown in <FIG>. Optionally, once the sutures <NUM> are fixed in place, a mechanism within the vascular closure device <NUM> handle may be activated to cut the sutures just above the fixation ring/zone. Alternatively, the sutures <NUM> may be left at this stage and trimmed at the skin surface by the operator, as shown in <FIG>. The vascular closure device <NUM> is now fully removed.

An alternative view of the disclosure is shown in <FIG>. Note that the fascia membrane <NUM> is omitted in <FIG> for clarity in these images. <FIG>, the vascular closure device <NUM> advanced over guidewire <NUM> until tapered distal tip <NUM> is positioned such that deployment members (e.g. pusher rods <NUM>) exit the housing proximal to the fascia layer above the artery <NUM>. In <FIG>, engagement members <NUM> are deployed from the elongated housing <NUM> of the vascular closure device <NUM>, pulling along the pre-attached sutures <NUM> routed through the distal tip <NUM> of the vascular closure device <NUM>. In <FIG>, motion is reversed using a retraction member (as will be further elaborated below), thereby embedding the engagement members <NUM> into the tissue/fascia membrane <NUM>, for example according to a predetermined pattern surrounding the passage <NUM> through the tissue/fascia membrane <NUM>. The engagement members <NUM> are then released from the deployment member. In <FIG>, the engagement members <NUM> are in place with sutures <NUM> attached and the deployment members (e.g. pusher rods <NUM>) are retracted using the predetermined retraction force. In <FIG>, the vascular closure device <NUM> is partially withdrawn until the distal tip <NUM> is just above fascia membrane <NUM>, whereby suture tension is applied to pull the engagement members <NUM> together and to close the passage <NUM>, i.e. such that a diameter of the passage <NUM> is reduced. In <FIG>, sutures <NUM> are fixated, and the vascular closure device <NUM> is withdrawn.

Optionally, a hemostasis member (not explicitly shown in these images) may be added to the distal tip <NUM> of the vascular closure device <NUM>. This hemostasis member may be initially placed inside the artery <NUM> as the vascular closure device <NUM> is advanced to abut the fascia membrane <NUM>, and the hemostasis device activated to prevent bleeding from the artery <NUM> during use of the vascular closure device <NUM>. As the engagement members <NUM> are being brought together during initial retraction of the vascular closure device <NUM>, the hemostasis member may be deactivated and withdrawn. One example of a hemostasis member is an inflatable compliant balloon. Furthermore, a hollow lumen may optionally be left in the center of the elongated housing <NUM>, through which a dilator or cannula may be placed to facilitate initial insertion of the vascular closure device <NUM>. This dilator may be slowly removed as an aid to maintaining hemostasis during the tightening of the sutures <NUM>.

<FIG> provide a detailed view for the application of a locking member or fixing ring, here provided in the form of a preloaded locking coil <NUM> arranged to clench the suture <NUM>. In <FIG>, the locking coil <NUM> is depicted in its initial position, stretched onto the outer surface of a lumen extending from the distal end of a portion of housing <NUM>, with sutures <NUM> passing through this lumen to each of the engagement members <NUM>, which have been deployed to engage the tissue/fascia membrane <NUM>. In <FIG>, the retraction member (for example implemented using a mechanism for applying the above-mentioned retraction force) has been used to apply tension to the sutures <NUM>, resulting in a reduction of distance between the engagement members <NUM>, thereby closing the passage <NUM> in the tissue/fascia membrane <NUM>. The suture retention coil <NUM> has been pushed off the lumen noted above, and has contracted to grasp and fixate the sutures <NUM> to retain the engagement members <NUM> in their proximate positons. In <FIG>, the vascular closure device <NUM> has been withdrawn and the locking coil <NUM> has retained the engagement members <NUM> in their proximate positions, thereby enabling all tension to be released from the suture <NUM> in preparation for complete removal of the vascular closure device <NUM>, suture trimming just below the skin level, and completion of the closure procedure.

<FIG> illustrate the operation of an engagement member <NUM>, provided as a tube shaped element has been inclined or cut at one end portion. The tube shaped element may, for example, be formed from a cut hypotube <NUM>. In <FIG>, the hypotube <NUM> is shown mounted on the tip of the deployment member, here illustrated as arranged at the pushrod <NUM>, and the suture <NUM> is here shown attached to a location in the middle region of the hypotube <NUM>. The sharp/cut end of the hypotube <NUM> is about to penetrate the fascia membrane <NUM>. In <FIG>, the hypotube <NUM> has penetrated the fascia membrane <NUM>, and the pushrod <NUM> has been retracted leaving only the hypotube <NUM> and the attached suture <NUM> in positon. Tension has been applied to the suture <NUM>, and since the suture <NUM> is attached to the hypotube <NUM> in the middle region of one side, the hypotube <NUM> is in the process of rotating approximately <NUM>° as it comes to bear on the underside of the fascia membrane <NUM>. In <FIG>, the rotation process is complete and, as tension in the suture <NUM> has increased, the hypotube <NUM> has come into full contact with the fascia membrane <NUM> with contact occurring along the longitudinal axis of the hypotube <NUM>, thereby increasing the contact area and reducing the likelihood that the hypotube <NUM> could simply pull back out of the fascia membrane <NUM> through the hole created when it originally penetrated the fascia membrane <NUM>. In some cases, the hypotube <NUM> may be said to be mechanically captured by the fascia membrane <NUM> when in such full contact with fascia after the rotation process is complete as shown in <FIG>.

<FIG> illustrate a cross section of a further embodiment of a vascular closure <NUM>. <FIG> shows the device in its initial configuration. The pushrods <NUM>, i.e. engagement members, and suture <NUM> are contained within the device (not directly visible in <FIG>). A thumb button <NUM> is in <FIG> shown as not yet depressed, and an underlying coil spring <NUM> is in an extended position. The engagement members <NUM> are seen in their initial position nestled into the distal end <NUM> of the housing at the distal end of the engagement members <NUM>. The vascular closure device <NUM> further comprises a device-positioning member, in the form of an elongated handle <NUM>, to be aligned with an expected direction of the blood vessel.

<FIG> shows the vascular closure device <NUM> after the engagement members <NUM> have been deployed. The thumb button <NUM> has been depressed, thereby compressing the underlying coil spring <NUM>, and engaging a top clip <NUM> to retain it in place. The pushrods <NUM> are visible in their extended position, with the engagement members <NUM> still attached to the distal tips. <FIG> shows the vascular closure device <NUM> in a completion state, where the engaging clip <NUM> has been released, whereby the coil spring <NUM> will move back towards its initial position. In moving back to its initial position, a retraction force will be applied (using retraction members, not explicitly shown), whereby the sutures <NUM> are "drawn" back into the vascular closure device <NUM>. As discussed above, once the sutures <NUM> are drawn back into the vascular closure device <NUM>, the distance between the engagement members <NUM> will be reduced, consequently reducing the diameter of the passage through the tissue/fascia membrane <NUM>, indirectly forming the tissue look. Once the sutures have been completely retracted (based on the predetermined retraction force applied by means of the coil spring <NUM>), the locking member, such as the fixation ring <NUM> is positioned to secure the sutures <NUM> in the retracted state.

The prior description of the vascular closure device has focused on its initial use to close a vascular access, but in the event this initial use does not provide clinically acceptable hemostasis, it may be possible in some embodiments to use one or more additional vascular closure devices discussed herein to deploy additional engagement members and further support the approximation of the tissue to improve hemostasis to a clinically acceptable level.

Although the figures may show a sequence, the order of the steps may differ from what is depicted. Specifically, the anchor hook characteristic is shown much larger than actual for illustration purposes. Such variation may depend on the structural elements used and on designer choice. All such variations are within the scope of the disclosure. Additionally, even though the present disclosure has been described with reference to specific exemplifying embodiments thereof, many different alterations, modifications and the like will become apparent for those skilled in the art. In addition, any suitable feature, dimension or material of any particular vascular closure device embodiment discussed herein may be used or otherwise combined with any of the other vascular closure device embodiments discussed herein.

Claim 1:
A vascular closure device (<NUM>, <NUM>, <NUM>) for closing a passage through tissue (<NUM>) proximate to a blood vessel (<NUM>), the vascular closure device comprising:
an elongated housing (<NUM>) having a proximal end and a distal end, the distal end adapted to be proximate the tissue;
a first and a second engagement member (<NUM>) releasably arranged with the elongated housing;
a first and a second pusher rod (<NUM>) arranged with the elongated housing and adapted to extend from the distal section of the elongated housing in a distal and radially outward direction, the first and the second pusher rod being adapted to deploy the first and the second engagement member, respectively, by pushing the first and the second engagement member into the tissue proximate to the blood vessel at a distance from each other to engage in contact and to become secured with said tissue, without engaging a wall portion of the blood vessel;
a first and a second suture (<NUM>), the first and the second suture individually connected to the first and the second engagement member and routed into a lumen in a distal aspect of the vascular closure device;
a retraction member arranged with the elongated housing and adapted to retract the first and the second suture to reduce the distance between the first and the second engagement member to close the passage through tissue proximate to the blood vessel, and
said vascular closure device being characterized in that it further comprises a locking member arranged on the elongated housing, disposed about the first and the second suture and adapted to clench the first and the second suture in a retracted state, thereby creating a tissue lock,
wherein the locking member comprises a preloaded self-retracting fixation ring (<NUM>), sleeve or coil with an interior passage which is disposed about the first and the second suture, which is sized to allow free movement of the first and the second suture with the fixation ring, sleeve or coil in an expanded state and which has an interior surface that is adapted to clench the first and the second suture when in a retracted state.