Interventional retrieval hook

Abstract

Various embodiments described herein relate to an interventional hook-based retrieval device for retrieval of foreign bodies. The hook may be made from wire or tubing that may be attached to a shaft. In a preferred embodiment, the hook may be made from a superelastic alloy such as Nitinol and the retrieval device may comprise a variety of pre-shaped, pre-sized and pre-positioned bends in the hook or shaft(s) that may be used to increase the usefulness of the retrieval system, for example, as to directionality, grip strength and reduction in profile.

Description

INTERVENTIONAL RETRIEVAL HOOKCLAIM OF PRIORITY

[0001] This patent application claims priority to U.S. Provisional Patent Application No. 63 / 712,932, titled “INTERVENTIONAL RETRIEVAL HOOK,” and filed on October 28, 2024, which is herein incorporated by reference in its entirety .FIELD

[0002] The present disclosure relates to apparatus and methods for retrieval of items via a transcatheter intervention. In particular, it relates to a hook-based device and method that may be used for retrieval of an embolized tissue or thrombus, embolism coils, displaced or damaged medical devices, biological tissue, a filter such as a vena cava filter, an arterial filter, a cerebral filter, or any other appropriate filter, or any other type of object or material that may require retrieval and is amenable to being snared using a hook.BACKGROUND

[0003] The need for foreign body or retained foreign object retrieval is a known complication of interventional procedures. Such retained foreign objects, or foreign bodies, represent items that are unintentionally left inside the body or a cavity after an interventional procedure. These retained foreign objects or foreign bodies may be, for example, displaced or damaged medical devices, pacemaker leads, biological tissue, embolized tissue or thrombus, displaced or embolized stents, embolism coils, a filter such as a vena cava filter, an arterial filter, a cerebral filter, or any other appropriate filter. The presence of such retained foreign objects or foreign bodies in the body or a cavity may lead to vascular injury or perforation, embolization, infection or sepsis, and / or the need for further surgeries and interventions.

[0004] Indeed, retrieving these retained foreign objects or dislodged or migrated materials during interventional procedures is a well-documented and significant clinical challenge. Current and conventional retrieval systems and solutions include the use of pigtail catheters, loop-style snares, stent-style retrievers, and / or jaw-style snares, which may not always be appropriate for all types of retrieval. For example, existing retrieval systems may not be as effective for all retained foreign object types or locations.

[0005] Moreover, current retrieval solutions are not as effective in complex anatomy or tortuous vessels, which hinders access and visualization. Further, fragile or fragmented- 1 -SG Docket No.: 14925-721.600foreign objects, such as broken catheter tips or embolized coils, are especially difficult to grasp or remove.

[0006] Given this, there exists an overwhelming need for retrieval systems or solutions that have improvements such as, for example, improved directional control, grip strength, and a reduced profile, that allows for the navigation of complex anatomy, the secure engagement of various foreign object types, and the reduction of the risk of complications.SUMMARY OF THE DISCLOSURE

[0007] Different from conventional solutions, the present disclosure solves the above problems by allowing for an interventional hook-based retrieval system and solution that may allow for improved directional control, grip strength, and a reduced profile, among many other improvements. Further, the present disclosure provides for a hook-based retrieval system and solution comprising a profile with appropriate hooks and hook opening control bends that may allow for the secure engagement of various foreign object types, active opening and closing of the hook, and active steering or orienting of the hook.

[0008] Moreover, the present disclosure provides for a hook-based retrieval system and solution with an improved control handle comprising active elements such as sliders or knobs to control an inner catheter and an outer catheter, thereby allowing for improved directional control in complex anatomy or tortuous vessels. In this manner, the present disclosure arrives at a solution for a hook-based retrieval system that is able to securely grasp or engage foreign objects in complex anatomies such as tortuous vessels via enhanced practitioner controls, while reducing the risk of complications.

[0009] In one embodiment, the present disclosure details an interventional hook-based retrieval device for retrieval of foreign bodies. The hook may be made from wire or tubing that is attached to a long shaft. In a preferred embodiment, the hook is made from a superelastic alloy such as Nitinol; however, it may be made from any material with sufficient strength and elasticity, including stainless steel, spring steel, beta titanium, or PEEK. The material of the shaft may be the same material as the hook, or it may be a different material with less elasticity. If the shaft is the same material as the hook, the hook and the shaft may be made from one continuous tube or wire, or it may have a joint or junction. In one aspect, embodiments of the retrieval device described herein may be very low profile (<5 Fr). Additionally or optionally depending on the situation, the retrieval device may be combined with a larger sheath for full containment of whatever is being retrieved. As described below, retrieval of a stent or filter or other structure adapted and configured to move between a- 2 -SG Docket No.: 14925-721.600stowed / compact state to a deployed / expanded state may benefit from a retrieval device - retrieval sheath combination.

[0010] In a further embodiment, the present disclosure details an interbody retrieval device comprising at least one hook connected to a shaft, a bend in the shaft, wherein the bend is located below a top of the at least one hook and above a tip of the at least one hook, and an inner catheter and an outer catheter surrounding the shaft, wherein the inner catheter is distally advanced relative to the shaft and over the bend in the shaft to open the at least one hook, wherein the inner catheter is retracted to close the at least one hook, and wherein the tip of the at least one hook may be captured within the outer catheter.

[0011] In still further embodiments, the outer catheter may be distally advanced relative to the shaft to capture the tip of the at least one hook. In other embodiments, the outer catheter may be distally withdrawn to expose the top of the at least one hook. In further embodiments, the at least one hook may be made from a superelastic material. In a further embodiment, the at least one hook may be made from Nitinol.

[0012] In an additional embodiment, the interbody retrieval device may comprise a control handle, wherein the advancement and retraction of the inner catheter and outer catheter are independently controlled.

[0013] In a further embodiment, the object to be retrieved may be a stent, a pacemaker lead, an embolized device, a damaged medical device, a vena cava filter, an arterial filter, a cerebral filter, an embolism coil, an embolized biological material, or a thrombus.

[0014] In still further embodiments, the interbody retrieval device may comprise an additional tip bend formed by bending the at least one hook inwardly from the top of the at least one hook before ending at the tip of the at least one hook.

[0015] In another embodiment, the at least one hook comprises a plurality of hooks. In still further embodiments, the plurality of hooks may bifurcate from a sleeve located in the shaft. In an alternative embodiment, each of the plurality of hooks may have its own respective shaft.

[0016] In yet another embodiment, , the interbody retrieval device may comprise at least one additional shaft bend formed in the proximal portion of the shaft. In a further embodiment, the at least one additional shaft bend may bend laterally toward the direction of the tip of the at least one hook. In still a further embodiment, the at least one additional shaft bend may bend laterally away from the direction of the tip of the at least one hook.

[0017] In still a further embodiment, the at least one additional shaft bend comprises a plurality of additional shaft bends. In an additional embodiment, at least one of the plurality- 3 -SG Docket No.: 14925-721.600of additional shaft bends, bends laterally toward the direction of the tip of the at least one hook, and at least one of the plurality of additional shaft bends, bends laterally away from the direction of the tip of the at least one hook.

[0018] In a further embodiment, the present disclosure details a method for retrieving an object from a human body, the method comprising providing an interbody retrieval device comprising at least one hook, an inner catheter, and an outer catheter, where the hook contains a hook opening control bend between a top of the at least one hook and a tip of the at least one hook, advancing the at least one hook to a location proximate to an object to be retrieved, advancing the inner catheter over the hook opening control bend to open the at least one hook, advancing the tip of the open hook to a point distal to the proximal end of the object to be retrieved with the open hook, and withdrawing the device to engage the object to be retrieved, withdrawing the inner catheter to close the hook, and advancing the outer catheter over the tip of the at least one hook.

[0019] In a further embodiment, the method may comprise advancing a retrieval sheath over the outer catheter and the device. In a still further embodiment, the method may comprise withdrawing the retrieval sheath and the captured object form the body. In yet another embodiment, the bend may be located below the top of the at least one hook and above the tip of the at least one hook.

[0020] In yet a further embodiment, the present disclosure details a method of retrieving an object from a human body, the method comprising advancing an interbody retrieval device in a stowed configuration within an outer catheter to a location proximate to the object, transitioning a distal portion of a distal hook of the interbody retrieval device from the stowed configuration into an open configuration beyond a distal most end of the outer catheter, adjusting the orientation of a portion of the tip of the distal hook relative to a shaft by advancing an inner catheter over a control bend in the shaft, engaging a portion of the object with the distal hook, and advancing the outer sheath to close the distal hook and secure the object to the outer catheter.

[0021] In a further embodiment, the method may comprise advancing a retrieval sheath over the outer catheter and withdrawing the object into the retrieval sheath. In still further embodiments, the step of adjusting the orientation of a portion of the distal hook by advancing an inner catheter over the control bend produces a curved direction of motion of a top of the distal hook. In a further embodiment, the step of adjusting the orientation of a portion of the distal hook by advancing an inner catheter over the control bend separates the tip of the hook from the shaft.- 4 -SG Docket No.: 14925-721.600

[0022] In yet another embodiment, after performing the advancing the outer sheath step, the object secured to the outer catheter may be a stent, a pacemaker lead, an embolized device, a damaged medical device, a vena cava filter, an arterial filter, a cerebral filter, an embolism coil, an embolized biological material, or a thrombus.

[0023] The shape of the hook is such that it may open sufficiently to enclose the object to be retrieved. The hook of the present disclosure is formed into a shape that comprises multiple bends in the hook or the shaft. These multiple bends may be configured in such a way to facilitate active opening and closing of the hook opening and / or active steering or orienting of the hook. These multiple bends may be in the same plane or in different planes. The additional bend may be a bend in an otherwise straight section of wire or it may be a locally reduced radius in a larger radius section of the wire. The tip of the hook may be sharpened, rounded or ballized. The hook may be coated with a hydrophilic coating or an antithrombotic coating. The diameter of the wire that forms the hook may be the same diameter as the shaft, may be smaller or larger than the shaft, and may be tapered or profileground in whole or in part to locally optimize strength and / or elasticity.

[0024] The shaft of the hook may be enclosed within two telescoping lumens — an inner catheter and an outer catheter. These three components — the hook and its shaft together, the inner catheter, and the outer catheter — may form the primary functional elements of the present disclosure. The inner catheter and the outer catheter may be advanced or retracted independently. The inner catheter may be advanced or retracted over the bends in the hook or the shaft (as described above) to facilitate the opening and closing of the hook and adjusting the orientation of the hook or shaft. The inner catheter may be made from an appropriately stiff material to overcome the elastic forces of the bends in the wire of the hook or shaft. Such materials may include a metal hypotube (such as stainless steel) or a stiff polymer (such as PEEK), or any other appropriately stiff material. The outer catheter may serve to fully enclose the hook during insertion and also to capture the tip of the hook after the object has been captured to ensure a strong grip on the retrieved object.

[0025] In a preferred embodiment, the interventional retrieval hook of the present disclosure may attach to a control handle that contains active elements (sliders, knobs, etc.) that are used to advance and retract the inner and outer catheters to perform the functions as described above.

[0026] Optionally, there may be an additional retrieval sheath, through which the interventional retrieval hook of the present invention is introduced. In this embodiment, the- 5 -SG Docket No.: 14925-721.600retrieved object may either partially or fully pulled into this retrieval sheath to enclose it for removal from the body.BRIEF DESCRIPTION OF THE DRAWINGS

[0027] A better understanding of the features and advantages of the methods and apparatuses described herein will be obtained by reference to the following detailed description that sets forth illustrative embodiments, and the accompanying drawings of which:

[0028] FIG. 1 illustrates a perspective and partially exploded view of a first embodiment of an exemplary interventional retrieval hook device in a deployed condition. The exemplary interventional hook device comprises a proximal end and a distal end. Further, the exemplary interventional hook device comprises a control handle comprising a proximal end and a distal end, wherein the control handle is located on the proximal end of the device; an inner catheter and an outer catheter, wherein each of the inner catheter and the outer catheter extends from the proximal end of the device to the distal end of the device; a retrieval sheath extending from the distal end of the device; and a distal most end of the distal end of the device comprising an elongate shaft and a hook, wherein the hook further comprises a hook opening control bend, a top of the hook, and a tip of the hook or a hook tip.

[0029] FIG. 2A is a front perspective view of the distal end of FIG. 1 showing an alternative embodiment of the interventional retrieval hook device shown in FIG. 1, wherein interventional retrieval hook device comprises an outer catheter, an inner catheter, an elongate shaft, and a hook, wherein the hook further comprises a hook control bend, a top of the hook, an additional tip bend, and a hook tip. FIG. 2A illustrates the additional tip bend formed by bending the hook inwardly from the top of the hook, before ending at the hook tip.

[0030] FIG. 2B is a front perspective view of the distal end of FIG. 1 showing an alternative embodiment of the interventional retrieval hook device shown in FIG. 1, wherein the interventional retrieval hook device comprises an outer catheter, an inner catheter, an elongate shaft, and a hook, wherein the hook further comprises a hook control bend, a top of the hook, and a hook tip. FIG. 2B illustrates a hook similar to the hook of FIG. 2A, but without the hook control bend.

[0031] FIG. 2C is a front perspective view of the distal end of FIG. 1 showing the embodiment of the interventional retrieval hook device shown in FIG. 1, wherein the interventional retrieval hook device comprises an outer catheter, an inner catheter, an elongate shaft and a hook, wherein the hook comprises an elongate shaft, a hook control- 6 -SG Docket No.: 14925-721.600bend, a top of the hook, and a hook tip. FIG. 2C illustrates a hook similar to the hook of FIG. 2B, but with the hook opening control bend located farther away from the top of the hook.

[0032] FIG. 2D1 is a front perspective view of the distal end of FIG. 1 showing an alternative embodiment of the interventional retrieval hook device shown in FIG. 1, wherein the interventional retrieval hook device comprises an outer catheter, an inner catheter, an elongate shaft, a sleeve, and two mirrored hooks bifurcating from the sleeve. FIG. 2D1 illustrates a hook similar to the hook of FIG. 2B, but with a double set of mirrored hooks and respective shorter hook tips, as compared to the hook tip of the hook shown in FIG. 2B.

[0033] FIG. 2D2 illustrates the side view of the interventional retrieval hook device shown in FIG. 2D1, wherein the interventional retrieval hook device comprises an outer catheter, an inner catheter, an elongate shaft, a sleeve, and two mirrored hooks bifurcating from the sleeve.

[0034] FIG. 2E is a front perspective view of the distal end of FIG. 1 showing an alternative embodiment of the interventional retrieval hook device shown in FIG. 1, wherein the interventional retrieval hook device comprises an outer catheter, an inner catheter, and mirrored elongate shafts, wherein each of the mirrored elongated shafts connects to or forms its own respective hook. FIG. 2E illustrates a double set of mirrored hooks similar to the hooks shown in FIG. 2D1, 2D2; however, each of the hooks do not comprise a sleeve and are not joined to the same elongated shaft.

[0035] FIG. 2F is a front perspective view of the distal end of FIG. 1 showing an alternative embodiment of the interventional retrieval hook device shown in FIG. 1, wherein the interventional retrieval hook device comprises an outer catheter, an inner catheter, an elongated shaft, and a hook, wherein the hook comprises a shaft bend, a hook control bend, a top of the hook, and a hook tip. FIG. 2F illustrates a hook similar to the hook of FIG. 2C, but with an additional shaft bend. As may be seen in FIG. 2F, the shaft bend may be formed by bending the proximal portion of the elongated shaft laterally toward the direction of the hook tip.

[0036] FIG. 2G is a front perspective view of the distal end of FIG. 1 showing an alternative embodiment of the interventional retrieval hook device shown in FIG. 1, wherein the interventional retrieval hook device comprises an outer catheter, an inner catheter, an elongated shaft, and a hook, wherein the hook comprises a shaft bend, a hook control bend, a top of the hook, and a hook tip. FIG. 2G illustrates a hook similar to the hook of FIG. 2F, but with an additional shaft bend in the opposite direction to the shaft bend of the hook of FIG.- 7 -SG Docket No.: 14925-721.6002F. As may be seen in FIG. 2G, the bend shaft may be formed by bending the proximal portion of the elongated shaft laterally away from the direction of the hook tip.

[0037] FIG. 2H is a front perspective view of the distal end of FIG. 1 showing an alternative embodiment of the interventional retrieval hook device shown in FIG. 1, wherein the interventional retrieval hook device comprises an outer catheter, an inner catheter, an elongated shaft, and a hook, wherein the hook further comprises a plurality of shaft bends, a hook control bend, a top of the hook, and a hook tip. As seen in FIG. 2H, one shaft bend of the plurality of shaft bends may be formed by bending the proximal portion of the elongated shaft laterally toward the direction of the hook tip, another shaft bend of the plurality of shaft bends may be formed by bending the proximal portion of the elongated shaft laterally away from the direction of the hook tip, and another shaft bend of the plurality of shaft bends may be formed by bending the proximal portion of the elongated shaft laterally toward the direction of the hook tip.

[0038] FIGS. 3A-3T illustrate an example of a method of retrieval of a retained foreign object(s) or foreign bodies using an embodiment of the present disclosure. Specifically, FIGs 3 A- 3T illustrate the use of the interventional retrieval hook device of FIG. 2C. However, the method of retrieval of a retained foreign object(s) or foreign bodies shown in FIGs. 3A-3T may apply or be used with any of the interventional retrieval hook devices of FIGs. 2A-2H.

[0039] FIG. 3 A illustrates a step of the method of retrieval of a retained foreign object or a stent from a cavity, an organ, and / or lumen, wherein the outer catheter is used to introduce the hook retrieval device of FIG. 2C.

[0040] FIG. 3B illustrates the next step of the method of retrieval of a retained foreign object or a stent from a cavity, an organ, and / or lumen, wherein the outer catheter may be partially withdrawn to expose the top of the hook.

[0041] FIG. 3C illustrates the next step of the method of retrieval of a retained foreign object or a stent from a cavity, an organ, and / or lumen, wherein the outer catheter may be further withdrawn to expose the majority of the hook.

[0042] FIG. 3D illustrates the next step of the method of retrieval of a retained foreign object or a stent from a cavity, an organ, and / or lumen, wherein the outer catheter may be further withdrawn to expose the hook and the hook opening control bend.

[0043] FIG. 3E illustrates the next step of the method of retrieval of a retained foreign object or a stent from a cavity, an organ, and / or lumen, wherein the outer catheter may be further withdrawn to fully expose the hook, including the hook tip, and the shaft, in preparation for retrieval of the retained foreign object or stent.- 8 -SG Docket No.: 14925-721.600

[0044] FIG. 3F illustrates the next step of the method of retrieval of a retained foreign object or a stent from a cavity, an organ, and / or lumen, wherein the inner catheter may be advanced and begin to emerge from the outer catheter.

[0045] FIG. 3G illustrates the next step of the method of retrieval of a retained foreign object or a stent from a cavity, an organ, and / or lumen, wherein the inner catheter may be advanced over the hook control bend, causing the hook to open and the hook tip to move away from the elongate shaft.

[0046] FIG. 3H illustrates the next step of the method of retrieval of a retained foreign object or a stent from a cavity, an organ, and / or lumen, wherein, since the hook is opened, the entire hook retrieval device may be advanced to position itself for engagement of a strut of the stent, in which the hook is hidden inside of the stent.

[0047] FIG. 31 illustrates the next step of the method of retrieval of a retained foreign object or a stent from a cavity, an organ, and / or lumen, wherein the entire hook retrieval device may be shown to be pulled back to allow the hook tip to engage and surround a strut of the stent.

[0048] FIG. 3 J illustrates the next step of the method of retrieval of a retained foreign object or a stent from a cavity, an organ, and / or lumen, wherein further withdrawal of the hook retrieval device may fully engage the hook with the stent, thereby securely grasping the stent.

[0049] FIG. 3K illustrates the next step of the method of retrieval of a retained foreign object or a stent from a cavity, an organ, and / or lumen, wherein, to further secure the engagement with the stent, the inner catheter may be withdrawn below the hook opening control bend to enable the hook to close, thereby securely engaging the stent.

[0050] FIG. 3L illustrates the next step of the method of retrieval of a retained foreign object or a stent from a cavity, an organ, and / or lumen, wherein the inner catheter may be further withdrawn in preparation for retrieval.

[0051] FIG. 3M illustrates the next step of the method of retrieval of a retained foreign object or a stent from a cavity, an organ, and / or lumen, wherein the outer catheter may be advanced over the hook tip.

[0052] FIG. 3N illustrates the next step of the method of retrieval of a retained foreign object or a stent from a cavity, an organ, and / or lumen, wherein the outer catheter may be further advanced over the hook tip such that the hook tip is completely encapsulated or covered by the outer catheter.- 9 -SG Docket No.: 14925-721.600

[0053] FIG. 30 illustrates the next step of the method of retrieval of a retained foreign object or a stent from a cavity, an organ, and / or lumen, wherein the outer catheter may be further advanced over the hook tip such that only the top of the hook and the captured stent strut remain distal to the lumen of the outer catheter.

[0054] In the FIGS. 3P-3T described below, the retrieval sheath as shown and detailed in FIG. 1 may be utilized to remove the captured object or stent.

[0055] FIG. 3P illustrates the next step of the method of retrieval of a retained foreign object or a stent from a cavity, an organ, and / or lumen, wherein the retrieval sheath may be initially introduced to advance over or to telescope over the outer catheter.

[0056] FIG. 3Q illustrates the next step of the method of retrieval of a retained foreign object or a stent from a cavity, an organ, and / or lumen, wherein retrieval sheath may be advanced to cover or telescope over most of the outer catheter, except for the most distal part of the outer catheter.

[0057] FIG. 3R illustrates the next step of the method of retrieval of a retained foreign object or a stent from a cavity, an organ, and / or lumen, wherein the retrieval sheath may be advanced to fully cover the outer catheter and begin covering and retrieving part of the captured stent.

[0058] FIG. 3S illustrates the next step of the method of retrieval of a retained foreign object or a stent from a cavity, an organ, and / or lumen, wherein the retrieval sheath may be advanced to cover most of the captured stent.

[0059] FIG. 3T illustrates the next step of the method of retrieval of a retained foreign object or a stent from a cavity, an organ, and / or lumen, wherein the retrieval sheath completely covers the retrieval hook and the captured stent within it, thereby allowing the user or practitioner to remove the entire interventional retrieval hook device and the captured stent from the patient.DETAILED DESCRIPTION

[0060] Embodiments of the present disclosure improve upon existing retrieval system designs with a wire-based, hook-style snare that may facilitate a much stronger grip on the object to be retrieved. In addition, the hook may comprise one or multiple bends in the wire of the hook and the shaft that allow active opening and closing of the hook and / or active steering or orienting of the hook. In various implementations, embodiments of the present disclosure may be used for vascular retrieval, or for retrieval anywhere else in the body that- 10 -SG Docket No.: 14925-721.600may be accessed with a catheter-based device, such as a hollow body organ like the heart or gut or body lumens such as veins and arteries.

[0061] FIG. 1 illustrates a perspective and partially exploded view of a first embodiment of an exemplary interventional retrieval hook device 60 in a deployed condition constructed in accordance with the principles of the present disclosure.

[0062] As seen in FIG. 1, the exemplary interventional hook device 60 comprises a proximal end and a distal end. Further, the exemplary interventional hook device 60 comprises a control handle 50 further comprising a proximal end and a distal end, wherein the control handle 50 is located on the proximal end of the interventional hook device 60. As can be seen in FIG. 1, the control handle 50 further comprises an inner catheter slider 52 and an outer catheter 53, which represent controls for advancing and retracting the inner catheter 22 and the outer catheter 23, as described later in the present disclosure.

[0063] As also seen in FIG. 1, the interventional hook device 60 further comprises an inner catheter 22 and an outer catheter 23, wherein each of the inner catheter 22 and the outer catheter 23 extends from the proximal end of the interventional hook device 60 to the distal end of the interventional hook device 60. Further, a hemostasis valve 37 may be connected via a proximal hub 35 to a retrieval sheath 30. Also, the interventional hook device 60 further comprises a retrieval sheath 30 extending from the proximal hub 35 to the distal end of the interventional hook device 60. Further, as seen in FIG. 1, the interventional hook device 60 comprises a distal most end of the distal end of the interventional hook device 60 comprising an elongate shaft 12 and a hook 10, wherein the hook 10 further comprises a hook opening control bend 15, a top 14 of the hook 10, and a tip 11 of the hook 10 or a hook tip 11.

[0064] As seen in FIG. 1, the distal most end of the distal end of the interventional hook device 60 comprises a shaft 12 with a distal end and a proximal end, and a hook 10 with a distal end and a proximal end. As further seen in FIG. 1, the proximal end of the shaft 12 connects to and extends from a distal end of the inner catheter 22, and the distal end of the shaft 12 connects to the proximal end of the hook 10. Further, as seen in FIG. 1, the elongate shaft 12 may extend or telescope through the inner catheter 22 and the outer catheter 23, such that the elongate shaft 12 extends from the distal most end of the distal end of the interventional hook device 60 to the proximal end of the interventional hook device 60.

[0065] As mentioned above, the hook 10 comprises a distal end and a proximal end. As seen in FIG. 1, the proximal end of the hook 10 extends from the distal end of the shaft 12. Further, the distal end of the hook 10 further comprises a hook opening control bend 15, a top 14 of the hook 10, and a tip 11 of the hook 10 or a hook tip 11. As further seen in FIG. l,the- 11 -SG Docket No.: 14925-721.600hook 10 may be formed from a wire that may be preformed to form or make the shape of the hook 10, wherein the shape of the hook 10 extends from the proximal end of the hook 10 to the distal end of the hook 10. As seen in FIG. 1, the hook 10 extends from its proximal end to form the hook opening control bend 15 and then the top 14 of the hook 10, and then ends with the tip 11 of the hook 10 or the hook tip 11 at the distal most end of the distal end of the hook 10. As further seen in FIG. 1, the hook opening control bend 15 may be proximal to the top 14 of the hook 10.

[0066] As mentioned above and further seen in FIG. 1, the elongate shaft 12 may extend or telescope through the inner catheter 22, such that the elongate shaft 12 extends from the distal most end of the distal end of the interventional hook device 60 to the proximal end of the interventional hook device 60. Similarly, as seen in FIG. 1, the inner catheter 22 may extend or telescope through the outer catheter 23, such that the inner catheter 22 extends from the distal end of the interventional hook device 60 to the proximal end of the interventional hook device 60. Further, as seen in FIG. 1, the outer catheter 23 may comprise a proximal end and a distal end, wherein the proximal end of the outer catheter 23 may connect to the distal end of the control handle 50. As such, the elongate shaft 12, the inner catheter 22, and the outer catheter 23 may be attached to the control handle 50. Also, as seen in FIG. 1, the distal end of the outer catheter 23 may allow for the telescoping and / or sliding movement of the inner catheter 22 and the elongate shaft 12.

[0067] As further seen in FIG. 1, the control handle 50 may comprise controls for advancing and retracting the inner catheter 22 and the outer catheter 23. As seen in FIG. 1, the control handle 50 may comprise an inner catheter slider 52 and an outer catheter slider 53. As further seen in FIG. 1, the control handle 50 may comprise a pair of dual channels, guideways, slots, tracks and / or grooves for each of the inner catheter slider 52 and the outer catheter slider 53. The pair of dual channels, guideways, slots, tracks and / or grooves may allow for controlled passage for each of the inner catheter slider 52 and an outer catheter slider 53.

[0068] Further, as seen in FIG. 1, each of the inner catheter slider 52 and the outer catheter slider 53 may further comprise a knob attached to a shaft. Moreover, a user or practitioner may utilize the inner catheter slider 52 to actuate advancement or retraction of the inner catheter 22 accordingly. For example, a user or practitioner may hold on to the knob of the inner catheter slider 52 and move the inner catheter slider 52 linearly along the appropriate channel, guideway, slot, track, or groove of the control handle 50 such that the shaft of the inner catheter slider 52 moves along the appropriate channel, guideway, slot,- 12 -SG Docket No.: 14925-721.600track, or groove. Doing so will actuate advancement or retraction of the inner catheter 22 accordingly.

[0069] Similarly, a user or practitioner may utilize the outer catheter slider 53 to advance or retract the outer catheter 23, as need be. For example, a user or practitioner may hold on to the knob of the outer catheter slider 53 and move the outer catheter slider 53 linearly along the appropriate channel, guideway, slot, track, or groove of the control handle 50 such that the shaft of the outer catheter slider 53 moves along the appropriate channel, guideway, slot, track, or groove. Doing so will actuate advancement or retraction of the outer catheter 23 accordingly.

[0070] As can be further seen in FIG. 1, the interventional retrieval hook device 60 may comprise a retrieval sheath 30. The retriever sheath 30 may comprise a flexible tubular body that may be introduced coaxially over the outer catheter 23, as seen in FIGs. 3P-3T and described later in the present disclosure. Also, as seen in FIG. 1, the outer catheter 23 may be configured for telescoping deployment within the retrieval sheath 30.

[0071] Moreover, the retrieval sheath 30 may comprise a flexible tubular body with an internal lumen dimensioned to accommodate the outer catheter 23, while permitting passage of the of other retrieval elements associated with the interventional retrieval hook device 60 and the retained foreign object(s). Indeed, the retrieval sheath 30 may allow the user or practitioner to retrieve the entire interventional retrieval hook device 60 along with retained foreign object(s), as seen in FIGS. 3P-3T.

[0072] Additionally, the retrieval sheath 30 may further comprise a proximal end and a distal end. The distal end of the retrieval sheath 30 may comprise a flared section, an expandable section, or a funnel-shaped section, wherein the flared section, the expandable section, or the funnel-shaped section may facilitate envelopment of target materials such as the retrieval elements associated with the interventional retrieval hook device 60 and the retained foreign object(s). Further, as seen in FIG. 1, the proximal end of the retrieval sheath 30 may be connected to a distal end of the proximal hub 35.

[0073] Further, the flared section, the expandable section, or the funnel-shaped section of the retrieval sheath 30 may comprise an expandable mesh or a polymer sleeve that conforms to the shape of the object(s) being retrieved. Indeed, the expandable mesh or polymer sleeve may dynamically adapt to the size and shape of the object(s) being retrieved, and to the particular anatomy in which the object is located, whether a cavity, an organ, and / or a lumen. Further, the expandable mesh may comprise a mesh material comprised of nitinol, stainless steel, or polymeric filaments woven into a flexible lattice. Indeed, nitinol offers shape- 13 -SG Docket No.: 14925-721.600memory and superelasticity, which will enhance the ability of the interventional retrieval hook device 60 to conform and to navigate difficult and tortuous anatomies. Further still, the polymer sleeve may comprise elastomeric materials such as silicone, polyurethane, or PTFE, which provides compliance and biocompatible.

[0074] Moreover, the expandable mesh or the polymer sleeve of the retrieval sheath 30 may comprise an expandable geometry, wherein the expandable mesh or the polymer sleeve may be preloaded in a collapsed state and expand upon deployment, either passively (via elastic recoil) or actively (via mechanical actuation). Once expanded, the expandable mesh or the polymer sleeve of the retrieval sheath 30 may form a containment chamber that resists migration and slippage during retrieval of the elements associated with the interventional retrieval hook device 60 and the retained foreign object(s). As such, the expandable geometry of the expandable mesh or the polymer sleeve aids in secure capture and engagement of the retained foreign object(s). Further, the flexible nature of the expandable mesh or the polymer sleeve allows for a minimally traumatic outcome, since the flexible nature of the expandable mesh or the polymer sleeve of the retrieval sheath 30 reduces trauma to surrounding tissue during engagement and withdrawal.

[0075] Indeed, the aforementioned conformability and adaptability of the flared section, the expandable section, or the funnel-shaped section of the retrieval sheath 30 allows it to conform to irregular or variable geometries. This conformability and adaptability allows the retrieval sheath 30 to envelope various retained foreign objects such as displaced or damaged medical devices, catheter fragments, pacemaker leads, biological tissue, embolized tissue or thrombus, displaced or embolized stents, embolism coils, and filters such as vena cava filters, arterial filters, cerebral filters, or any other appropriate filter. Further, this conformability and adaptability allows the retrieval sheath 30 to navigate difficult and tortuous anatomies. Hence, the conformability and adaptability of the flared section, the expandable section, or the funnel-shaped section of the retrieval sheath 30 enhances the ability of the interventional retrieval hook device 60 to securely capture and extract retained foreign objects, dislodged devices, or procedural debris from within a vessel, cavity, or organ, and to navigate difficult or tortuous anomalies within a vessels, cavity, or organ.

[0076] Additionally, the distal end of the retrieval sheath 30 may comprise radiopaque markers for fluoroscopic visualization, which may be further reinforced with embedded structural elements to resist collapse or kinking during navigation through a tortuous anatomy. These radiopaque markers may aid in fluoroscopic guidance of the interventional retrieval hook device 60.- 14 -SG Docket No.: 14925-721.600

[0077] Further, as seen in FIG. 1, the proximal end of the retrieval sheath 30 may be connected to a proximal hub 35 of a hemostasis valve 37.

[0078] As seen in FIG. 1, the proximal hub 35 may be a cone-shaped interface or structure that tapers from a wider base connected to the hemostasis valve 37 to a narrower neck. As further seen in FIG. 1, the proximal hub 35 may allow and facilitate smooth insertion of the retrieval sheath 30 and the outer catheter 23. As seen in FIG. 1, the cone- shaped geometrical structure of the proximal hub 35 streamlines the introduction of the retrieval sheath 30 and the outer catheter 23, thereby reducing insertion resistance and aligning the retrieval sheath 30 concentrically with the outer catheter 23.

[0079] Further, the cone-shaped interface or structure of the proximal hub 35 ensures that the proximal hub 35’s connection to the hemostasis valve 37 allows for a secure and leakresistance connection to the hemostasis valve 37, thereby enhancing sealing engagement with the hemostasis valve 37. In further embodiments, the proximal hub 35 may comprise texturing or reinforcement on its cone-shaped interface or structure to enhance stability and control during deployment.

[0080] As can be further seen in FIG. 1, the interventional retrieval hook device 60 may be used with a hemostasis valve 37. As seen in FIG. 1, the hemostasis valve 37 comprises a cylindrical housing. Indeed, the hemostasis valve 37 may maintain a blood-tight seal during and throughout the use of the interventional retrieval hook device 60. As such, the hemostasis valve 37 may prevent blood from escaping the vascular system during the use and manipulation of the interventional retrieval hook device 60. Further, the hemostasis valve 37 may comprise a compliant sealant membrane within its cylindrical housing that dynamically adjusts to varying shaft diameters, as needed, thereby minimizing blood loss and preventing air ingress during use and manipulation of the interventional retrieval hook device 60.

[0081] Moreover, the hemostasis valve 37 may allow and enable the introduction, manipulation, and exchange of the interventional retrieval hook device 60, depending on which interventional retrieval hook device 60 is appropriate to use. As seen in FIGs. 2A-2H, there are several embodiments of the interventional retrieval hook device 60 that may be utilized, depending on the size, type, and material of the foreign object(s) and the anatomy in which the foreign object(s) is lodged in. As such, a user or practitioner may utilize several versions of the interventional retrieval hook device 60, as need be. In such a case, the hemostasis valve 37 may allow for the introduction, manipulation, and exchange of the appropriate interventional retrieval hook device 60, while maintaining the aforementioned- 15 -SG Docket No.: 14925-721.600sealing. Further, the hemostasis valve 37 prevents air embolism prevention by reducing the risk of air entering the bloodstream during the aforementioned manipulation and exchange(s).

[0082] FIGS. 2A-2H illustrate a number of different shape embodiments for the interventional retrieval hook device 60 of the present disclosure. Specifically, several exemplary specific shapes for the hook 10 and shaft 12 are shown in FIGS. 2 A through 2H.

[0083] As seen in FIG. 2A, the interventional retrieval hook device 60 comprises an outer catheter 23, an inner catheter 22, an elongate shaft 12, and a hook 10, wherein the hook 10 further comprises a hook control bend 15, a top 14 of the hook 10, an additional tip bend 17, and a hook tip 11. As may be seen in FIG. 2A, the hook control bend 15 may form by veering the hook 10 from the vertical elongate shaft 12 of the hook 10 and then bending the hook 10 towards the top 14 of the hook 10. As seen in FIG. 2A, the hook control bend 15 is located near the top 14 of the hook 10. As also seen in FIG. 2A, the hook opening control bend 15 may be located on the shaft 12 in an area below the top 14 of the hook 10 and above the hook tip 11. As further seen in FIG. 2 A, the additional tip bend 17 forms by bending the hook 10 inwardly from the top 14 of the hook 10, before ending at the hook tip 11.

[0084] When operating the interventional retrieval hook device 60, the user or practitioner may introduce the interventional retrieval hook device 60 with the hook of FIG. 2A to the appropriate location, as shown in FIG. 3 A and discussed later in the present disclosure. It is noted that FIGs. 3A-3T show the use of the interventional retrieval hook device 60 with the hook 10 of FIG. 2C and not the hook 10 of FIG. 2 A. However, since the method of use of the interventional retrieval hook device 60 illustrated in FIGs. 3A-3T is analogous regardless of the hook 10 utilized, FIGs. 3A-3T will be referenced henceforth to allow for an explanation of the hook 10 of FIG. 2 A.

[0085] After introduction of the interventional retrieval hook device 60, the user or practitioner may utilize the aforementioned outer catheter slider 53 to actuate a retraction of the outer catheter 23 and expose the top 14 of the hook 10, as shown in FIGS. 3B-3E and discussed later in the present disclosure.

[0086] Thereafter, the user or practitioner may utilize the aforementioned inner catheter slider 52 to actuate an advancement of the inner catheter 22. The advancement of the inner catheter 22 over the hook control bend 15 may cause the hook 10 to open, thereby allowing the hook 10 to more easily and securely engage and capture the retained foreign object(s), as shown in FIGs. 3F-3 J and discussed later in the present disclosure. Indeed, the opening of the hook 10 enables the hook 10 to open for the capture of the foreign retained object(s) it is intended to retrieve.- 16 -SG Docket No.: 14925-721.600

[0087] Further, the additional tip bend 17 may allow for the secure capture of retained foreign object(s) that may require a stronger grasping or clamping force or are otherwise located in tight crevices and / or difficult or tortuous anatomies. Further still, the hook control bend 15 may be designed such that the hook tip 11 may extend away from the shaft 12 when the inner catheter 22 is advanced over the hook opening control bend 15, as seen in FIG. 3G especially. As mentioned above, this causes the hook 10 to open up to more easily enable it to capture the retained foreign object(s) it is intended to retrieve.

[0088] After capturing the retained foreign object(s), as seen in FIG. 3 J, the user or practitioner may utilize the aforementioned inner catheter slider 52 to actuate a retraction of the inner catheter 22 such that the inner catheter 22 is retracted below the hook control bend 15, as seen in FIGs. 3K-3L. This, in turn, closes the hook 10 and causes the hook tip 11 to point towards, and be closer to, the elongate shaft 12, as seen in FIG. 3L especially. The location of the hook tip 11 towards and closer to the elongate shaft 12 may allow for easier capture of the hook tip 11 when the user or practitioner actuates the aforementioned outer catheter slider 53 to advance the outer catheter 23, as seen in FIGS. 3M-3O.

[0089] As such, to be effective in the aforementioned opening and closing of the hook 10 via the advancement and retraction of the inner catheter 22, the hook opening control bend 15 may be located on the shaft 12 in an area below the top 14 of the hook 10 and above the hook tip 11. Indeed, it is the location of the control bend 15 on the shaft 12 in an area below the top 14 of the hook 10 and above the hook tip 11 that may allow the user or practitioner to utilize the aforementioned inner catheter slider 52 to advance the inner catheter 22 to open the hook10 and thereafter to retract the inner catheter 22 to close the hook 10. Hence, the user or practitioner may be able to carefully control the hook 10 of the interventional retrieval hook device 60 to open the hook 10 to securely engage and grasp the retained foreign object(s) and to thereafter close the hook 10 to ensure that the retained foreign object(s) is securely clenched within the hook 10.

[0090] Further, the hook control bend 15 and the additional tip bend 17 may be either preformed with a fixed curvature or actively deflectable via a control wire or shaft manipulation. Additionally, each of the hook control bend 15 and the additional tip bend 17 may comprise radiopaque markers for visualization under fluoroscopy to further enhance operator visualization. As such, each of the hook control bend 15 and the additional tip bend 17 in the hook 10 may allow the user or operator to steer, orient, and / or engage the hook tip11 with greater precision during retrieval of the retained foreign object(s). Hence, each of the hook control bend 15 and the additional tip bend 17 enhances the interventional retrieval- 17 -SG Docket No.: 14925-721.600hook device 60 by augmenting the user’s or operator’s ability to navigate difficult and tortious anatomy and the hook 10’s ability to securely engage the retained foreign object(s) with minimal trauma.

[0091] As seen in FIG. 2B, the interventional retrieval hook device 60 comprises an outer catheter 23, an inner catheter 22, an elongate shaft 12, and a hook 10, wherein the hook 10 further comprises a hook control bend 15, a top 14 of the hook 10, and a hook tip 11. As seen in FIG. 2B, the hook 10 may be similar to the hook 10 of FIG. 2A, but without the hook control bend 17.

[0092] As may be seen in FIG. 2B, the hook control bend 15 may form by veering the hook 10 from the vertical elongate shaft 12 of the hook 10 and then bending the hook 10 towards the top 14 of the hook 10. As seen in FIG. 2B, the hook control bend 15 is located near the top 14 of the hook 10. As also seen in FIG. 2B, the hook opening control bend 15 may be located on the shaft 12 in an area below the top 14 of the hook 10 and above the hook tip 11.

[0093] When operating the interventional retrieval hook device 60, the user or practitioner may introduce the interventional retrieval hook device 60 with the hook of FIG. 2B to the appropriate location, as shown in FIG. 3 A and discussed later in the present disclosure. It is noted that FIGS. 3 A-3T show the use of the interventional retrieval hook device 60 with the hook 10 of FIG. 2C and not the hook 10 of FIG. 2B. However, since the method of use of the interventional retrieval hook device 60 illustrated in FIGS. 3A-3T is analogous regardless of the hook 10 utilized, FIGS. 3A-3T will be referenced henceforth to allow for an explanation of the hook 10 of FIG. 2B.

[0094] After introduction of the interventional hook device 60, the user or practitioner may utilize the aforementioned outer catheter slider 53 to actuate a retraction of the outer catheter 23 and expose the top 14 of the hook 10, as shown in FIGS. 3B-3E and discussed later in the present disclosure.

[0095] Thereafter, the user or practitioner may utilize the aforementioned inner catheter slider 52 to actuate an advancement of the inner catheter 22. The advancement of the inner catheter 22 over the hook control bend 15 may cause the hook 10 to open, thereby allowing the hook 10 to more easily and securely engage and capture the retained foreign object(s), as shown in FIGs. 3F-3 J and discussed later in the present disclosure. Indeed, the opening of the hook 10 enables the hook 10 to open for the capture of the foreign retained object(s) it is intended to retrieve.- 18 -SG Docket No.: 14925-721.600

[0096] Further, the hook control bend 15 may be designed such that the hook tip 11 may extend away from the shaft 12 when the inner catheter 22 is advanced over the hook opening control bend 15, as seen in FIG. 3G especially. As mentioned above, this causes the hook 10 to open up to more easily enable it to capture the retained foreign object(s) it is intended to retrieve.

[0097] After capturing the retained foreign object(s), as seen in FIG. 3 J, the user or practitioner may utilize the aforementioned inner catheter slider 52 to actuate a retraction of the inner catheter 22 such that the inner catheter 22 is retracted below the hook control bend 15, as seen in FIGs. 3K-3L. This, in turn, closes the hook 10 and causes the hook tip 11 to point towards, and be closer to, the elongate shaft 12, as seen in FIG. 3L especially. The location of the hook tip 11 towards and closer to the elongate shaft 12 may allow for easier capture of the hook tip 11 when the user or practitioner actuates the aforementioned outer catheter slider 53 to advance the outer catheter 23, as seen in FIGs. 3M-3O.

[0098] As such, to be effective in the aforementioned opening and closing of the hook 10 via the advancement and retraction of the inner catheter 22, the hook opening control bend 15 may be located on the shaft 12 in an area below the top 14 of the hook 10 and above the hook tip 11. Indeed, it is the location of the control bend 15 on the shaft 12 in an area below the top 14 of the hook 10 and above the hook tip 11 that may allow the user or practitioner to utilize the aforementioned inner catheter slider 52 to advance the inner catheter 22 to open the hook 10 and thereafter to retract the inner catheter 22 to close the hook 10. Hence, the user or practitioner may be able to carefully control the hook 10 of the interventional retrieval hook device 60 to open the hook 10 to securely engage and grasp the retained foreign object(s) and to thereafter close the hook 10 to ensure that the retained foreign object(s) is securely clenched within the hook 10.

[0099] Further, the hook control bend 15 may be either preformed with a fixed curvature or actively deflectable via a control wire or shaft manipulation. Additionally, the hook control bend 15 may comprise radiopaque markers for visualization under fluoroscopy to further enhance operator visualization. As such, the hook control bend 15 in the hook 10 may allow the user or operator to steer, orient, and / or engage the hook tip 11 with greater precision during retrieval of the retained foreign object(s). Hence, the hook control bend 15 enhances the interventional retrieval hook device 60 by augmenting the user’s or operator’s ability to navigate difficult and tortuous anatomy and the hook 10’s ability to securely engage the retained foreign object(s) with minimal trauma.- 19 -SG Docket No.: 14925-721.600

[0100] As seen in FIG. 2C, the interventional retrieval hook device 60 comprises an outer catheter 23, an inner catheter 22, an elongate shaft 12 and a hook 10, wherein the hook 10 comprises an elongate shaft 12, a hook control bend 15, a top 14 of the hook 10, and a hook tip 11.

[0101] As seen in FIG. 2C, the hook 10 similar to the hook 10 of FIG. 2B, but with the hook opening control bend 15 located farther away from the top 14 of the hook 10. Indeed, such a structure for the hook 10 wherein the hook opening control bend 15 located farther away from the top 14 of the hook 10 may be more suitable for the retrieval of retained foreign object(s) from certain anatomies.

[0102] As further seen in FIG. 2C, the hook control bend 15 may form by veering the hook 10 from the vertical elongate shaft 12 of the hook 10 and then bending the hook 10 towards the top 14 of the hook 10. As seen in FIG. 2C, the hook control bend 15 is located near the top 14 of the hook 10. As also seen in FIG. 2C, the hook opening control bend 15 may be located on the shaft 12 in an area below the top 14 of the hook 10 and above the hook tip 11.

[0103] When operating the interventional retrieval hook device 60, the user or practitioner may introduce the interventional retrieval hook device 60 with the hook of FIG. 2C to the appropriate location, as shown in FIG. 3 A and discussed later in the present disclosure. After which, the user or practitioner may utilize the aforementioned outer catheter slider 53 to actuate a retraction of the outer catheter 23 and expose the top 14 of the hook 10, as shown in FIGS. 3B-3E and discussed later in the present disclosure.

[0104] Thereafter, the user or practitioner may utilize the aforementioned inner catheter slider 52 to actuate an advancement of the inner catheter 22. The advancement of the inner catheter 22 over the hook control bend 15 may cause the hook 10 to open, thereby allowing the hook 10 to more easily and securely engage and capture the retained foreign object(s), as shown in FIGs. 3F-3 J and discussed later in the present disclosure. Indeed, the opening of the hook 10 enables the hook 10 to open for the capture of the foreign retained object(s) it is intended to retrieve.

[0105] Further, the hook control bend 15 may be designed such that the hook tip 11 may extend away from the shaft 12 when the inner catheter 22 is advanced over the hook opening control bend 15, as seen in FIG. 3G especially. As mentioned above, this causes the hook 10 to open up to more easily enable it to capture the retained foreign object(s) it is intended to retrieve.- 20 -SG Docket No.: 14925-721.600

[0106] After capturing the retained foreign object(s), as seen in FIG. 3 J, the user or practitioner may utilize the aforementioned inner catheter slider 52 to actuate a retraction of the inner catheter 22 such that the inner catheter 22 is retracted below the hook control bend 15, as seen in FIGS. 3K-3L. This, in turn, closes the hook 10 and causes the hook tip 11 to point towards, and be closer to, the elongate shaft 12, as seen in FIG. 3L especially. The location of the hook tip 11 towards and closer to the elongate shaft 12 may allow for easier capture of the hook tip 11 when the user or practitioner actuates the aforementioned outer catheter slider 53 to advance the outer catheter 23, as seen in FIGS. 3M-3O.

[0107] As such, to be effective in the aforementioned opening and closing of the hook 10 via the advancement and retraction of the inner catheter 22, the hook opening control bend 15 may be located on the shaft 12 in an area below the top 14 of the hook 10 and above the hook tip 11. Indeed, it is the location of the control bend 15 on the shaft 12 in an area below the top 14 of the hook 10 and above the hook tip 11 that may allow the user or practitioner to utilize the aforementioned inner catheter slider 52 to advance the inner catheter 22 to open the hook 10 and thereafter to retract the inner catheter 22 to close the hook 10. Hence, the user or practitioner may be able to carefully control the hook 10 of the interventional retrieval hook device 60 to open the hook 10 to securely engage and grasp the retained foreign object(s) and to thereafter close the hook 10 to ensure that the retained foreign object(s) is securely clenched within the hook 10.

[0108] Further, the hook control bend 15 may be either preformed with a fixed curvature or actively deflectable via a control wire or shaft manipulation. Additionally, the hook control bend 15 may comprise radiopaque markers for visualization under fluoroscopy to further enhance operator visualization. As such, the hook control bend 15 in the hook 10 may allow the user or operator to steer, orient, and / or engage the hook tip 11 with greater precision during retrieval of the retained foreign object(s). Hence, the hook control bend 15 enhances the interventional retrieval hook device 60 by augmenting the user’s or operator’s ability to navigate difficult and tortuous anatomy and the hook 10’s ability to securely engage the retained foreign object(s) with minimal trauma.

[0109] As seen in each of FIG. 2D1 and 2D2, the interventional retrieval hook device 60 comprises an outer catheter 23, an inner catheter 22, an elongate shaft 12, a sleeve 18, and two mirrored hooks 10a, 10b bifurcating from the sleeve 18. Further, FIG. 2D1 illustrates the front view of the hook 10 and FIG. 2D2 illustrates the side view of the hook 10.

[0110] FIG. 2D1 and FIG. 2D2 illustrates a hook 10 similar to the hook 10 of FIG. 2B, but with a double set of mirrored hooks 10a, 10b and respective shorter hook tips 1 la, 1 lb, as- 21 -SG Docket No.: 14925-721.600compared to the hook tip 11 of the hook 10 shown in FIG. 2B. Indeed, such a structure of mirrored hooks 10a, 10b bifurcating from the sleeve 18 and respective shorter hook tips I la, 1 lb may be more suitable for the retrieval of retained foreign object(s) from certain anatomies.[oni] As seen in FIG. 2D1, hook 10a further comprises a hook control bend 15a, a top 14a of the hook 10a, and a hook tip I la. As also seen in FIG. 2D1, the hook control bend 15a may form by further veering the hook 10a from the vertical elongate shaft 12 after its bifurcation from the sleeve 18, and then bending the hook 10a towards the top 14a of the hook 10a. As further seen in FIG. 2D1, the hook control bend 15a may be located near the top 14a of the hook 10a. As also seen in FIG. 2D1, the hook opening control bend 15a may be located on the shaft 12 in an area below the top 14a of the hook 10a and above the hook tip I la.

[0112] Similarly, hook 10b further comprises a hook control bend 15b, a top 14b of the hook 10b, and a hook tip 1 lb. As may be seen in FIG. 2D1, the hook control bend 15b may form by further veering the hook 10b from the vertical elongate shaft 12 after its bifurcation from the sleeve 18, and then bending the hook 10b towards the top 14b of the hook 10b. As further seen in FIG. 2D1, the hook control bend 15b may be located near the top 14b of the hook 10b. As also seen in FIG. 2D1, the hook opening control bend 15b may be located on the shaft 12 in an area below the top 14b of the hook 10b and above the hook tip 1 lb.

[0113] When operating the interventional retrieval hook device 60, the user or practitioner may introduce the interventional retrieval hook device 60 with the hooks 10a, 10b of FIG. 2D1, 2D2 to the appropriate anatomical location, as shown in FIG. 3 A and discussed later in the present disclosure. It is noted that FIGS. 3 A-3T show the use of the interventional retrieval hook device 60 with the hook 10 of FIG. 2C and not the hooks 10a, 10b of FIGs. 2D1, 2D2. However, since the method of use of the interventional retrieval hook device 60 illustrated in FIGS. 3A-3T is analogous regardless of the hook 10 utilized, FIGS. 3A-3T will be referenced henceforth to allow for an explanation of the hooks 10a, 10b of FIGS. 2D1, 2D2.

[0114] After introduction of the interventional retrieval hook device 60, the user or practitioner may utilize the aforementioned outer catheter slider 53 to actuate a retraction of the outer catheter 23 and expose the tops 14a, 14b of each of the hooks 10a, 10b, as shown in FIGS. 3B-3E and discussed later in the present disclosure.

[0115] Thereafter, the user or practitioner may utilize the aforementioned inner catheter slider 52 to actuate an advancement of the inner catheter 22. The advancement of the inner- 22 -SG Docket No.: 14925-721.600catheter 22 over each of the hook control bends 15 a, 15b of each of the hooks 10a, 10b may cause each of the hooks 10a, 10b to open, thereby allowing each of the hooks 10a, 10b to more easily and securely engage and capture the retained foreign object(s), as shown in FIGs. 3F-3 J and discussed later in the present disclosure. Indeed, the opening of each of the hooks 10a, 10b enables each of the hooks 10a, 10b to open for the capture of the foreign retained object(s) it is intended to retrieve.

[0116] Further, the use of mirrored hooks 10a, 10b as shown in FIG. 2D1, 2D2 may allow for the simultaneous and secure capture of retained foreign object(s), thereby improve efficiency and effectiveness. Moreover, the use of mirrored hooks 10a, 10b as shown in FIG. 2D1, 2D2 may allow for the simultaneous and secure capture of retained foreign object(s) that may require a stronger grasping or clamping force or retained foreign object(s) that are otherwise located in tight crevices and / or difficult or tortuous anatomies.

[0117] Further still, each of the hook control bends 15a, 15b of each of the hooks 10a, 10b may be designed such that each of the hook tips I la, 11b may extend away from the shaft 12 when the inner catheter 22 is advanced over each of the hook opening control bends 15a, 15b of each of the hooks 10a, 10b, as seen in FIG. 3G especially. As mentioned above, this causes each of the hooks 10a, 10b to open up to more easily enable it to capture the retained foreign object(s) it is intended to retrieve.

[0118] After capturing the retained foreign object(s), as seen in FIG. 3 J, the user or practitioner may utilize the aforementioned inner catheter slider 52 to actuate a retraction of the inner catheter 22 such that the inner catheter 22 is retracted below each of the hook control bends 15a, 15b, as seen in FIGS. 3K-3L. This, in turn, closes each of the hooks 10a, 10b and causes each of the hook tips I la, 1 lb to point towards, and be closer to, the elongate shaft 12, as seen in FIG. 3L especially. The location of each of the hook tips I la, 1 lb towards and closer to the elongate shaft 12 may allow for easier capture of each of the hook tips I la, 1 lb when the user or practitioner actuates the aforementioned outer catheter slider 53 to advance the outer catheter 23, as seen in FIGS. 3M-3O.

[0119] As such, to be effective in the aforementioned opening and closing of each of the hooks 10a, 10b via the advancement and retraction of the inner catheter 22, each of the hook opening control bends 15a, 15b may be located on the shaft 12 in an area below its respective top 14a, 14b of the respective hook 10a, 10b and above its respective hook tip I la, 1 lb. Indeed, it is the location of each of the control bends 15a, 15b on the shaft 12 in an area below the respective top 14a, 14b of the respective hook 10a, 10b and above its respective hook tip I la, 11b that may allow the user or practitioner to utilize the aforementioned inner- 23 -SG Docket No.: 14925-721.600catheter slider 52 to advance the inner catheter 22 to open each hook 10a, 10b and thereafter to retract the inner catheter 22 to close each hook 10a, 10b. Hence, the user or practitioner may be able to carefully control each hook 10a, 10b of the interventional retrieval hook device 60 to open each hook 10a, 10b to securely engage and grasp the retained foreign object(s) and to thereafter close each hook 10a, 10b to ensure that the retained foreign object(s) is securely clenched within each hook 10a, 10b.

[0120] Further, each hook control bend 15a, 15b may be either preformed with a fixed curvature or actively deflectable via a control wire or shaft manipulation. Additionally, each hook control bend 15a, 15b may comprise radiopaque markers for visualization under fluoroscopy to further enhance operator visualization. As such, each hook control bend 15a, 15b may allow the user or operator to steer, orient, and / or engage the respective hook tip I la, 1 lb with greater precision during retrieval of the retained foreign object(s). Hence, each hook control bend 15a, 15b enhances the interventional retrieval hook device 60 by augmenting the user’s or operator’s ability to navigate difficult and tortious anatomy and each of the hook 10a, lOb’s ability to securely engage the retained foreign object(s) with minimal trauma.

[0121] As seen in FIG. 2E, the interventional retrieval hook device 60 comprises an outer catheter 23, an inner catheter 22, and mirrored elongate shafts 12a, 12b, wherein each of the mirrored elongated shafts 12a, 12b connects to or forms its own respective hook 10a, 10b.

[0122] FIG. 2E illustrates a double set of mirrored hooks 10a, 10b similar to the hooks 10a, 10b shown in FIG. 2D1, 2D2; however, each of the hooks 10a, 10b do not comprise a sleeve 18 and are not joined to an elongated shaft 12. Rather, as seen in FIG. 2E, each hook 10a, 10b and accompanying hook tip I la, 1 lb has its own respective shaft 12a, 12b, each of which further extends to the aforementioned control handle 50 shown in FIG. 1. In one aspect, the control handle 50 may be modified to enable independent and / or coordinated control of shafts 12a, 12b of their respective hooks 10a, 10b.

[0123] As further seen in FIG. 2E, hook 10a further comprises a hook control bend 15a, a top 14a of the hook 10a, and a hook tip I la. As also seen in FIG. 2E, the hook control bend 15a may form by further veering the hook 10a from the vertical elongate shaft 12a, and then bending the hook 10a towards the top 14a of the hook 10a. As further seen in FIG. 2E, the hook control bend 15a may be located near the top 14a of the hook 10a. As also seen in FIG. 2E, the hook opening control bend 15a may be located on the shaft 12a in an area below the top 14a of the hook 10a and above the hook tip I la.

[0124] Similarly, hook 10b further comprises a hook control bend 15b, a top 14b of the hook 10b, and a hook tip 1 lb. As may be seen in FIG. 2E, the hook control bend 15b may- 24 -SG Docket No.: 14925-721.600form by further veering the hook 10b from the vertical elongate shaft 12b, and then bending the hook 10b towards the top 14b of the hook 10b. As further seen in FIG. 2E, the hook control bend 15b may be located near the top 14b of the hook 10b. As also seen in FIG. 2E, the hook opening control bend 15b may be located on the shaft 12b in an area below the top 14b of the hook 10b and above the hook tip 1 lb.

[0125] When operating the interventional retrieval hook device 60, the user or practitioner may introduce the interventional retrieval hook device 60 with the hooks 10a, 10b of FIG. 2E to the appropriate location, as shown in FIG. 3A and discussed later in the present disclosure. It is noted that FIGS. 3A-3T show the use of the interventional retrieval hook device 60 with the hook 10 of FIG. 2C and not the hooks 10a, 10b of FIG. 2E. However, since the method of use of the interventional retrieval hook device 60 illustrated in FIGS. 3A-3T is analogous regardless of the hook 10 utilized, FIGs. 3A-3T will be referenced henceforth to allow for an explanation of the hooks 10a, 10b of FIG. 2E.

[0126] After introduction of the interventional retrieval hook device 60, the user or practitioner may utilize the aforementioned outer catheter slider 53 to actuate a retraction of the outer catheter 23 and expose the tops 14a, 14b of each of the hooks 10a, 10b, as shown in FIGS. 3B-3E and discussed later in the present disclosure.

[0127] Thereafter, the user or practitioner may utilize the aforementioned inner catheter slider 52 to actuate an advancement of the inner catheter 22. The advancement of the inner catheter 22 over each of the hook control bends 15 a, 15b of each of the hooks 10a, 10b may cause each of the hooks 10a, 10b to open, thereby allowing each of the hooks 10a, 10b to more easily and securely engage and capture the retained foreign object(s), as shown in FIGs. 3F-3 J and discussed later in the present disclosure. Indeed, the opening of each of the hooks 10a, 10b enables each of the hooks 10a, 10b to open for the capture of the foreign retained object(s) it is intended to retrieve.

[0128] Further, the use of mirrored hooks 10a, 10b as shown in FIG. 2E may allow for the simultaneous and secure capture of retained foreign object(s), thereby improve efficiency and effectiveness. Moreover, the use of mirrored hooks 10a, 10b as shown in FIG. 2E may allow for the simultaneous and secure capture of retained foreign object(s) that may require a stronger grasping or clamping force or retained foreign object(s) that are otherwise located in tight crevices and / or difficult or tortuous anatomies.

[0129] Further still, each of the hook control bends 15a, 15b of each of the hooks 10a, 10b may be designed such that each of the hook tips I la, 11b may extend away from each of the shafts 12a, 12b when the inner catheter 22 is advanced over each of the hook opening- 25 -SG Docket No.: 14925-721.600control bends 15a, 15b of each of the hooks 10a, 10b, as seen in FIG. 3G especially. As mentioned above, this causes each of the hooks 10a, 10b to open up to more easily enable it to capture the retained foreign object(s) it is intended to retrieve.

[0130] After capturing the retained foreign object(s), as seen in FIG. 3 J, the user or practitioner may utilize the aforementioned inner catheter slider 52 to actuate a retraction of the inner catheter 22 such that the inner catheter 22 is retracted below each of the hook control bends 15a, 15b, as seen in FIGS. 3K-3L. This, in turn, closes each of the hooks 10a, 10b and causes each of the hook tips I la, 1 lb to point towards, and be closer to, its respective elongate shaft 12a, 12b, as seen in FIG. 3L especially. The location of each of the hook tips I la, 1 lb towards and closer to its respective elongate shaft 12a, 12b may allow for easier capture of each of the hook tips I la, 11b when the user or practitioner actuates the aforementioned outer catheter slider 53 to advance the outer catheter 23, as seen in FIGS. 3M-3O.

[0131] As such, to be effective in the aforementioned opening and closing of each of the hooks 10a, 10b via the advancement and retraction of the inner catheter 22, each of the hook opening control bends 15a, 15b may be located on its respective shaft 12a, 12b in an area below its respective top 14a, 14b of the respective hook 10a, 10b and above its respective hook tip I la, 1 lb. Indeed, it is the location of each of the control bends 15a, 15b on its respective shaft 12a, 12b in an area below the respective top 14a, 14b of the respective hook 10a, 10b and above its respective hook tip I la, 11b that may allow the user or practitioner to utilize the aforementioned inner catheter slider 52 to advance the inner catheter 22 to open each hook 10a, 10b and thereafter to retract the inner catheter 22 to close each hook 10a, 10b. Hence, the user or practitioner may be able to carefully control each hook 10a, 10b of the interventional retrieval hook device 60 to open each hook 10a, 10b to securely engage and grasp the retained foreign object(s) and to thereafter close each hook 10a, 10b to ensure that the retained foreign object(s) is securely clenched within each hook 10a, 10b.

[0132] Further, each hook control bend 15a, 15b may be either preformed with a fixed curvature or actively deflectable via a control wire or shaft manipulation. Additionally, each hook control bend 15a, 15b may comprise radiopaque markers for visualization under fluoroscopy to further enhance operator visualization. As such, each hook control bend 15a, 15b may allow the user or operator to steer, orient, and / or engage the respective hook tip I la, 1 lb with greater precision during retrieval of the retained foreign object(s). Hence, each hook control bend 15a, 15b enhances the interventional retrieval hook device 60 by augmenting the- 26 -SG Docket No.: 14925-721.600user’s or operator’s ability to navigate difficult and tortious anatomy and each of the hook 10a, lOb’s ability to securely engage the retained foreign object(s) with minimal trauma.

[0133] FIG. 2F illustrates a hook 10 similar to the hook 10 of FIG. 2C, but with an additional shaft bend 16. As seen in FIG. 2F, the interventional retrieval hook device 60 comprises an outer catheter 23, an inner catheter 22, an elongated shaft 12, and a hook 10, wherein the hook 10 comprises a shaft bend 16, a hook control bend 15, a top 14 of the hook 10, and a hook tip 11. As may be seen in FIG. 2F, the shaft bend 16 may be formed by bending the proximal portion of the elongated shaft 12 laterally toward the direction of the hook tip 11. As further seen in FIG. 2F, the hook control bend 15 may form by veering the hook 10 from the vertical elongate shaft 12 of the hook 10 and then bending the hook 10 towards the top 14 of the hook 10. As seen in FIG. 2F, the hook control bend 15 may be located near the top 14 of the hook 10. As also seen in FIG. 2F, the hook opening control bend 15 may be located on the shaft 12 in an area below the top 14 of the hook 10 and above the hook tip 11.

[0134] When operating the interventional retrieval hook device 60, the user or practitioner may introduce the interventional retrieval hook device 60 with the hook 10 of FIG. 2F to the appropriate location, as shown in FIG. 3 A and discussed later in the present disclosure. It is noted that FIGS. 3 A-3T show the use of the interventional retrieval hook device 60 with the hook 10 of FIG. 2C and not the hook 10 of FIG. 2F. However, since the method of use of the interventional retrieval hook device 60 illustrated in FIGs. 3A-3T is analogous regardless of the hook 10 utilized, FIGS. 3A-3T will be referenced henceforth to allow for an explanation of the hook 10 of FIG. 2F.

[0135] After introduction of the interventional retrieval hook device 60, the user or practitioner may utilize the aforementioned outer catheter slider 53 to actuate a retraction of the outer catheter 23 and expose the top 14 of the hook 10, as shown in FIGS. 3B-3E and discussed later in the present disclosure.

[0136] Thereafter, the user or practitioner may utilize the aforementioned inner catheter slider 52 to actuate an advancement of the inner catheter 22. As seen in FIG. 2F, the advancement of the inner catheter 22 over the shaft bend 16 of the hook 10 may allow a distal portion of the elongated shaft 12 and the hook 10 to be moved laterally toward the direction of the hook tip 11 for positioning. This allows for a finer and more accurate positioning, especially for securely grasping a retained foreign object(s) that may be located in a difficult anatomy such as a tight crevice or cavity or a tortuous vessel.- 27 -SG Docket No.: 14925-721.600

[0137] Further, the advancement of the inner catheter 22 over the hook control bend 15 may cause the hook 10 to open, thereby allowing the hook 10 to more easily and securely engage and capture the retained foreign object(s), as shown in FIGS. 3F-3J and discussed later in the present disclosure. Indeed, the opening of the hook 10 enables the hook 10 to open for the capture of the foreign retained object(s) it is intended to retrieve.

[0138] Further, the hook control bend 15 may be designed such that the hook tip 11 may extend away from the shaft 12 when the inner catheter 22 is advanced over the hook opening control bend 15, as seen in FIG. 3G especially. As mentioned above, this causes the hook 10 to open up to more easily enable it to capture the retained foreign object(s) it is intended to retrieve.

[0139] After capturing the retained foreign object(s), as seen in FIG. 3 J, the user or practitioner may utilize the aforementioned inner catheter slider 52 to actuate a retraction of the inner catheter 22 such that the inner catheter 22 is retracted below the hook control bend 15, as seen in FIGS. 3K-3L. This, in turn, closes the hook 10 and causes the hook tip 11 to point towards, and be closer to, the elongate shaft 12, as seen in FIG. 3L especially. The location of the hook tip 11 towards and closer to the elongate shaft 12 may allow for easier capture of the hook tip 11 when the user or practitioner actuates the aforementioned outer catheter slider 53 to advance the outer catheter 23, as seen in FIGS. 3M-3O.

[0140] As such, to be effective in the aforementioned opening and closing of the hook 10 via the advancement and retraction of the inner catheter 22, the hook opening control bend 15 may be located on the shaft 12 in an area below the top 14 of the hook 10 and above the hook tip 11. Indeed, it is the location of the control bend 15 on the shaft 12 in an area below the top 14 of the hook 10 and above the hook tip 11 that may allow the user or practitioner to utilize the aforementioned inner catheter slider 52 to advance the inner catheter 22 to open the hook 10 and thereafter to retract the inner catheter 22 to close the hook 10. Hence, the user or practitioner may be able to carefully control the hook 10 of the interventional retrieval hook device 60 to open the hook 10 to securely engage and grasp the retained foreign object(s) and to thereafter close the hook 10 to ensure that the retained foreign object(s) is securely clenched within the hook 10.

[0141] Further, the hook control bend 15 and the shaft bend 16 may be either preformed with a fixed curvature or actively deflectable via a control wire or shaft manipulation. Additionally, each of the hook control bend 15 and the shaft bend 16 may comprise radiopaque markers for visualization under fluoroscopy to further enhance operator visualization. As such, each of the hook control bend 15 and the shaft bend 16 in the hook 10- 28 -SG Docket No.: 14925-721.600may allow the user or operator to steer, orient, and / or engage the hook tip 11 with greater precision during retrieval of the retained foreign object(s). Hence, each of the hook control bend 15 and the shaft bend 16 enhances the interventional retrieval hook device 60 by augmenting the user’s or operator’s ability to navigate difficult and tortious anatomy and the hook 10’s ability to securely engage the retained foreign object(s) with minimal trauma.

[0142] FIG. 2G illustrates a hook 10 similar to the hook 10 of FIG. 2F, but with an additional shaft bend 16 in the opposite direction to the shaft bend 16 of the hook 10 of FIG. 2F. As seen in FIG. 2G, the interventional retrieval hook device 60 comprises an outer catheter 23, an inner catheter 22, an elongated shaft 12, and a hook 10, wherein the hook 10 comprises a shaft bend 16, a hook control bend 15, a top 14 of the hook 10, and a hook tip 11. As may be seen in FIG. 2G, the bend shaft 16 may be formed by bending the proximal portion of the elongated shaft 12 laterally away from the direction of the hook tip 11. As further seen in FIG. 2G, the hook control bend 15 may form by veering the hook 10 from the vertical elongate shaft 12 of the hook 10 and then bending the hook 10 towards the top 14 of the hook 10. As seen in FIG. 2G, the hook control bend 15 may be located near the top 14 of the hook 10. As also seen in FIG. 2G, the hook opening control bend 15 may be located on the shaft 12 in an area below the top 14 of the hook 10 and above the hook tip 11.

[0143] When operating the interventional retrieval hook device 60, the user or practitioner may introduce the interventional retrieval hook device 60 with the hook 10 of FIG. 2G to the appropriate location, as shown in FIG. 3 A and discussed later in the present disclosure. It is noted that FIGS. 3 A-3T show the use of the interventional retrieval hook device 60 with the hook 10 of FIG. 2C and not the hook 10 of FIG. 2G. However, since the method of use of the interventional retrieval hook device 60 illustrated in FIGS. 3A-3T is analogous regardless of the hook 10 utilized, FIGS. 3A-3T will be referenced henceforth to allow for an explanation of the hook 10 of FIG. 2G.

[0144] After introduction of the interventional retrieval hook device 60, the user or practitioner may utilize the aforementioned outer catheter slider 53 to actuate a retraction of the outer catheter 23 and expose the top 14 of the hook 10, as shown in FIGs. 3B-3E and discussed later in the present disclosure.

[0145] Thereafter, the user or practitioner may utilize the aforementioned inner catheter slider 52 to actuate an advancement of the inner catheter 22. As seen in FIG. 2G, the advancement of the inner catheter 22 over the shaft bend 16 of the hook 10 may allow a distal portion of the elongated shaft 12 and the hook 10 to be moved laterally away from the direction of the hook tip 11 for positioning. This allows for a finer and more accurate- 29 -SG Docket No.: 14925-721.600positioning, especially for securely grasping a retained foreign object(s) that may be located in a difficult anatomy such as a tight crevice or cavity or a tortuous vessel.

[0146] Further, the advancement of the inner catheter 22 over the hook control bend 15 may cause the hook 10 to open, thereby allowing the hook 10 to more easily and securely engage and capture the retained foreign object(s), as shown in FIGs. 3F-3J and discussed later in the present disclosure. Indeed, the opening of the hook 10 enables the hook 10 to open for the capture of the foreign retained object(s) it is intended to retrieve.

[0147] Further, the hook control bend 15 may be designed such that the hook tip 11 may extend away from the shaft 12 when the inner catheter 22 is advanced over the hook opening control bend 15, as seen in FIG. 3G especially. As mentioned above, this causes the hook 10 to open up to more easily enable it to capture the retained foreign object(s) it is intended to retrieve.

[0148] After capturing the retained foreign object(s), as seen in FIG. 3 J, the user or practitioner may utilize the aforementioned inner catheter slider 52 to actuate a retraction of the inner catheter 22 such that the inner catheter 22 is retracted below the hook control bend 15, as seen in FIGs. 3K-3L. This, in turn, closes the hook 10 and causes the hook tip 11 to point towards, and be closer to, the elongate shaft 12, as seen in FIG. 3L especially. The location of the hook tip 11 towards and closer to the elongate shaft 12 may allow for easier capture of the hook tip 11 when the user or practitioner actuates the aforementioned outer catheter slider 53 to advance the outer catheter 23, as seen in FIGS. 3M-3O.

[0149] As such, to be effective in the aforementioned opening and closing of the hook 10 via the advancement and retraction of the inner catheter 22, the hook opening control bend 15 may be located on the shaft 12 in an area below the top 14 of the hook 10 and above the hook tip 11. Indeed, it is the location of the control bend 15 on the shaft 12 in an area below the top 14 of the hook 10 and above the hook tip 11 that may allow the user or practitioner to utilize the aforementioned inner catheter slider 52 to advance the inner catheter 22 to open the hook 10 and thereafter to retract the inner catheter 22 to close the hook 10. Hence, the user or practitioner may be able to carefully control the hook 10 of the interventional retrieval hook device 60 to open the hook 10 to securely engage and grasp the retained foreign object(s) and to thereafter close the hook 10 to ensure that the retained foreign object(s) is securely clenched within the hook 10.

[0150] Further, the hook control bend 15 and the shaft bend 16 may be either preformed with a fixed curvature or actively deflectable via a control wire or shaft manipulation. Additionally, each of the hook control bend 15 and the shaft bend 16 may comprise- 30 -SG Docket No.: 14925-721.600radiopaque markers for visualization under fluoroscopy to further enhance operator visualization. As such, each of the hook control bend 15 and the shaft bend 16 in the hook 10 may allow the user or operator to steer, orient, and / or engage the hook tip 11 with greater precision during retrieval of the retained foreign object(s). Hence, each of the hook control bend 15 and the shaft bend 16 enhances the interventional retrieval hook device 60 by augmenting the user’s or operator’s ability to navigate difficult and tortious anatomy and the hook 10’s ability to securely engage the retained foreign object(s) with minimal trauma.

[0151] FIG. 2H illustrates a hook 10 similar to the hook 10 of FIG. 2F and the hook 10 of FIG. 2G, but with additional shaft bends 16a, 16b, and 16c in alternating opposing directions. As seen in FIG. 2G, the interventional retrieval hook device 60 comprises an outer catheter 23, an inner catheter 22, an elongated shaft 12, and a hook 10, wherein the hook 10 further comprises shaft bends 16a, 16b, and 16c, a hook control bend 15, a top 14 of the hook 10, and a hook tip 11.

[0152] As may be seen in FIG. 2H, the shaft bend 16c may be formed by bending the proximal portion of the elongated shaft 12 laterally toward the direction of the hook tip 11, the shaft bend 16b may be formed by bending the proximal portion of the elongated shaft 12 laterally away from the direction of the hook tip 11, and the shaft bend 16a may be formed by bending the proximal portion of the elongated shaft 12 laterally toward the direction of the hook tip 11.

[0153] As further seen in FIG. 2H, the hook control bend 15 may form by veering the hook 10 from the vertical elongate shaft 12 of the hook 10 and then bending the hook 10 towards the top 14 of the hook 10. As seen in FIG. 2H, the hook control bend 15 may be located near the top 14 of the hook 10. As also seen in FIG. 2H, the hook opening control bend 15 may be located on the shaft 12 in an area below the top 14 of the hook 10 and above the hook tip 11.

[0154] When operating the interventional retrieval hook device 60, the user or practitioner may introduce the interventional retrieval hook device 60 with the hook 10 of FIG. 2H to the appropriate location, as shown in FIG. 3 A and discussed later in the present disclosure. It is noted that FIGS. 3 A-3T show the use of the interventional retrieval hook device 60 with the hook 10 of FIG. 2C and not the hook 10 of FIG. 2H. However, since the method of use of the interventional retrieval hook device 60 illustrated in FIGS. 3A-3T is analogous regardless of the hook 10 utilized, FIGS. 3A-3T will be referenced henceforth to allow for an explanation of the hook 10 of FIG. 2H.- 31 -SG Docket No.: 14925-721.600

[0155] After introduction of the interventional retrieval hook device 60, the user or practitioner may utilize the aforementioned outer catheter slider 53 to actuate a retraction of the outer catheter 23 and expose the top 14 of the hook 10, as shown in FIGs. 3B-3E and discussed later in the present disclosure.

[0156] Thereafter, the user or practitioner may utilize the aforementioned inner catheter slider 52 to actuate an advancement of the inner catheter 22. As seen in FIG. 2H, the advancement of the inner catheter 22 over the shaft bend 16c of the hook 10 may allow a distal portion of the elongated shaft 12 and the hook 10 to be moved laterally toward the direction of the hook tip 11 for positioning. Further, the advancement of the inner catheter 22 over the shaft bend 16b of the hook 10 may allow a distal portion of the elongated shaft 12 and the hook 10 to be moved laterally away from the direction of the hook tip 11 for positioning. Also, the advancement of the inner catheter 22 over the shaft bend 16a of the hook 10 may allow a distal portion of the elongated shaft 12 and the hook 10 to be moved laterally toward the direction of the hook tip 11 for positioning. This ability of the user or practitioner to position the elongated shaft 12 and the hook 10 in such alternating opposing directions allows for a finer and more accurate positioning, especially for securely grasping a retained foreign object(s) that may be located in a difficult anatomy such as a tight crevice or cavity or a tortuous vessel.

[0157] Moreover, in still other implementations, the one or more shaft bends 16a, 16b, 16c may also be sized, combined and oriented such that the elongated shaft 12 may bend perpendicular to the direction of the hook tip 11, or in any other desired orientation. This further allows for even more finer and accurate positioning of the hook 10 and the hook tip 11. This, in turn, will provide the user or practitioner with much leeway and flexibility when positioning the hook 10 and the hook tip 11.

[0158] Further, the advancement of the inner catheter 22 over the hook control bend 15 may cause the hook 10 to open, thereby allowing the hook 10 to more easily and securely engage and capture the retained foreign object(s), as shown in FIGS. 3F-3J and discussed later in the present disclosure. Indeed, the opening of the hook 10 enables the hook 10 to open for the capture of the foreign retained object(s) it is intended to retrieve.

[0159] Further, the hook control bend 15 may be designed such that the hook tip 11 may extend away from the shaft 12 when the inner catheter 22 is advanced over the hook opening control bend 15, as seen in FIG. 3G especially. As mentioned above, this causes the hook 10 to open up to more easily enable it to capture the retained foreign object(s) it is intended to retrieve.- 32 -SG Docket No.: 14925-721.600

[0160] After capturing the retained foreign object(s), as seen in FIG. 3 J, the user or practitioner may utilize the aforementioned inner catheter slider 52 to actuate a retraction of the inner catheter 22 such that the inner catheter 22 is retracted below the hook control bend 15, as seen in FIGS. 3K-3L. This, in turn, closes the hook 10 and causes the hook tip 11 to point towards, and be closer to, the elongate shaft 12, as seen in FIG. 3L especially. The location of the hook tip 11 towards and closer to the elongate shaft 12 may allow for easier capture of the hook tip 11 when the user or practitioner actuates the aforementioned outer catheter slider 53 to advance the outer catheter 23, as seen in FIGS. 3M-3O.

[0161] As such, to be effective in the aforementioned opening and closing of the hook 10 via the advancement and retraction of the inner catheter 22, the hook opening control bend 15 may be located on the shaft 12 in an area below the top 14 of the hook 10 and above the hook tip 11. Indeed, it is the location of the control bend 15 on the shaft 12 in an area below the top 14 of the hook 10 and above the hook tip 11 that may allow the user or practitioner to utilize the aforementioned inner catheter slider 52 to advance the inner catheter 22 to open the hook 10 and thereafter to retract the inner catheter 22 to close the hook 10. Hence, the user or practitioner may be able to carefully control the hook 10 of the interventional retrieval hook device 60 to open the hook 10 to securely engage and grasp the retained foreign object(s) and to thereafter close the hook 10 to ensure that the retained foreign object(s) is securely clenched within the hook 10.

[0162] Further, the hook control bend 15 and each of the shaft bends 16a, 16b, 16c may be either preformed with a fixed curvature or actively deflectable via a control wire or shaft manipulation. Additionally, each of the hook control bend 15 and each of the shaft bends 16a, 16b, 16c may comprise radiopaque markers for visualization under fluoroscopy to further enhance operator visualization. As such, each of the hook control bend 15 and each of the shaft bends 16a, 16b, 16c in the hook 10 may allow the user or operator to steer, orient, and / or engage the hook tip 11 with greater precision during retrieval of the retained foreign object(s). Hence, each of the hook control bend 15 and each of the shaft bends 16a, 16b, 16c enhances the interventional retrieval hook device 60 by augmenting the user’s or operator’s ability to navigate difficult and tortious anatomy and the hook 10’s ability to securely engage the retained foreign object(s) with minimal trauma.

[0163] By way of example and not limitation, FIGS. 3A-3T illustrate an example of a method of retrieval of a retained foreign object(s) or foreign bodies using an embodiment of the present disclosure. In the example of FIGS 3 A- 3T, the use of the interventional retrieval hook device 60 with the hook 10 of FIG. 2C is shown. However, the process shown in the- 33 -SG Docket No.: 14925-721.600examples of FIGS. 3A-3T may apply to any of the interventional retrieval hook devices 60 of FIGS. 2A-2H.

[0164] Further, in the example of FIGS. 3A-3T, the object to be retrieved may represented by a stent 70; however, the object to be retrieved may be an embolized medical device or implant, displaced or damaged medical devices, a pacemaker lead, biological tissue, embolized tissue or thrombus, embolism coils, filters such as vena cava filters, arterial filters, cerebral filters, or any other appropriate filter, or any other object that requires retrieval in a body lumen such as a vein or an artery or in a cavity such as a hollow body organ like the gut or the heart or any other part of the body amenable to the use of a catheter-based hook retrieval device as described herein.

[0165] Further still, in the example of FIGS. 3A-3T, the stent 70 may be received or retrieved from a vascular lumen 80. However, the stent 70 or object to be retrieved may be retrieved from any other bodily lumens beyond the vasculature, wherever device or object retrieval is desired and / or required. By way of example, the stent 70 or object may be retrieved from a cavity, an organ, hollow organs such as the heart or gut, and / or any appropriate bodily lumen. As such, in the example of FIGS. 3A-3T, the stent 70 and / or object / device to be retrieved may be retrieved from an organ 80, a hollow organ 80 such as the heart or gut, a cavity 80, bodily lumens 80 beyond the vasculature, and / or a combination of one or more of the aforementioned anatomical locations and / or lumens.

[0166] Moreover, the method of retrieval of a retained foreign object(s) or foreign bodies illustrated in FIGS. 3A-3T may be used after any interventional procedure(s), especially if a foreign object / body remains behind after procedure.

[0167] In still other aspects or embodiments, the user or practitioner may be able to, even in the midst of an interventional procedure, immediately halt the interventional procedure or bail out from the interventional procedure, if need be. Indeed, a user or practitioner may need to bail out from an interventional procedure due to an emergency, safety concerns, technical failure, patient complications such as hemodynamic instability, uncontrolled bleeding, pain, anxiety, intolerance to sedation, etc., device malfunction or misdeployment, anatomical challenges, imaging limitations, infection or sepsis, or complications such as a retained foreign body that cannot be retrieved safety.

[0168] If the user or the practitioner bails out from the interventional procedure, then the user or practitioner may utilize the method of retrieval of a retained foreign object(s) or foreign bodies illustrated in FIGS. 3A-3T. Moreover, the user or practitioner may utilize any of the interventional retrieval hook devices 60 of FIGS. 2A-2H. Furthermore, the method of- 34 -SG Docket No.: 14925-721.600retrieval of FIGS. 3A-3T may be done as a bail out method for any interventional procedure, including, for example, vascular and cardiovascular interventions such as angiography, angioplasty, stent placement, thrombectomy, IVC filter placement and removal, etc., or neurointerventional procedures such as cerebral angiography, coil embolization, mechanical thrombectomy, balloon-assisted embolization, etc., or pulmonary interventions such as bronchial artery embolization, lung biopsy, pleural draining, etc., or oncology-related interventions such as tumor ablation, chemoembolization, radioembolization, etc., or muscoskeletal and spine procedures such as vertebroplasty, bone augmentationjoint injections, etc., or gastrointestinal and hepatobiliary interventions such as biliary drainage, live biopsy, gastrostomy tube placement, etc., or any other interventional procedure(s).

[0169] FIG. 3 A illustrates the stent 70 to be retrieved in a vascular lumen 80 and the outer catheter 23. In FIG. 3 A, the outer catheter 23 is used to introduce the hook retrieval device 60 of the present disclosure. FIG. 3B illustrates the next step of the exemplary retrieval procedure, wherein the outer catheter 23 may be partially withdrawn to expose the top 14 of the hook 10. FIG. 3C illustrates the next step of the exemplary retrieval procedure, wherein the outer catheter 23 may be further withdrawn to expose the majority of the hook 10. FIG. 3D illustrates the next step of the exemplary retrieval procedure, wherein further withdrawal of the outer catheter 23 may be shown such that the hook opening control bend 15 is exposed. FIG. 3E illustrates the next step of the exemplary retrieval procedure, wherein the outer catheter 23 may be even further withdrawn to fully expose the hook 10, including the hook tip 11 and the shaft 12, in preparation for retrieval of the stent 70.

[0170] FIG. 3F illustrates the next step of the exemplary retrieval procedure, wherein the inner catheter 22 may be advanced and begin to emerge from the outer catheter 23. FIG. 3G illustrates the next step of the exemplary retrieval procedure, wherein the inner catheter 22 may be advanced over the hook control bend 15, causing the hook 10 to open and the hook tip 11 to move away from the elongate shaft 12.

[0171] FIG. 3H illustrates the next step of the exemplary retrieval procedure, wherein, since the hook 10 is opened, the entire the hook retrieval device 60 may be advanced to position itself for engagement of a strut of the stent 70, in which the hook 10 is hidden inside of the stent 70. FIG. 31 illustrates the next step of the exemplary retrieval procedure, wherein the entire the hook retrieval device 60 may be shown to be pulled back to allow the hook tip 11 to engage and surround a strut of the stent 70. FIG. 3 J illustrates the next step of the exemplary retrieval procedure, wherein further withdrawal of the hook retrieval device 60 may fully engage the hook 10 with the stent 70, thereby securely grasping the stent 70. FIG.- 35 -SG Docket No.: 14925-721.6003K illustrates the next step of the exemplary retrieval procedure, wherein, to further secure the engagement with the stent 70, the inner catheter 22 may be withdrawn below the hook opening control bend 15 to enable the hook 10 to close, thereby securely engaging the stent 70. FIG. 3L illustrates the next step of the exemplary retrieval procedure, wherein the inner catheter 22 may be further withdrawn in preparation for retrieval.

[0172] FIG. 3M illustrates the next step of the exemplary retrieval procedure, wherein the outer catheter 23 may be advanced over the hook tip 11. FIG. 3N illustrates the next step of the exemplary retrieval procedure, wherein the outer catheter 23 may be further advanced over the hook tip 11 such that the hook tip 11 is completely encapsulated or covered by the outer catheter 23. FIG. 30 illustrates the next step of the exemplary retrieval procedure, wherein the outer catheter 23 may be further advanced over the hook tip 11 such that only the top 14 of the hook 10 and the captured stent strut 70 remain distal to the lumen of the outer catheter 23. Indeed, in the aforementioned steps of FIGS. 3M-3O of the retrieval procedure, the user or practitioner locks in the engagement of the hook 10 with the stent 70.

[0173] In the steps illustrated in FIGS. 3P-3T, the retrieval sheath 30 as shown and detailed in FIG. 1 may be utilized to remove the captured object 70 or stent 70 from the body. As mentioned above, the retrieval sheath 30 may comprise a flexible tubular body with an internal lumen dimensioned to accommodate the outer catheter 23, while permitting passage of other retrieval elements associated with the interventional retrieval hook device 60 and the retained foreign object(s). Indeed, the retrieval sheath 30 may allow the user or practitioner to retrieve the entire interventional retrieval hook device 60 along with retained foreign object(s), as seen in FIGS. 3P-3T.

[0174] Additionally, the retrieval sheath 30 may further comprise a proximal end and a distal end. The distal end of the retrieval sheath 30 may comprise a flared section, an expandable section, or a funnel-shaped section, wherein the flared section, the expandable section, or the funnel-shaped section may facilitate envelopment of target materials such as the retrieval elements associated with the interventional retrieval hook device 60 and the retained foreign object(s).

[0175] Further, the flared section, the expandable section, or the funnel-shaped section of the retrieval sheath 30 may comprise an expandable mesh or a polymer sleeve that conforms to the shape of the object(s) being retrieved. Indeed, the expandable mesh or polymer sleeve may dynamically adapt to the size and shape of the object(s) being retrieved, and to the particular anatomy in which the object is located, whether a cavity, an organ, and / or a lumen. Further, the expandable mesh may comprise a mesh material comprised of nitinol, stainless- 36 -SG Docket No.: 14925-721.600steel, or polymeric filaments woven into a flexible lattice. Indeed, nitinol offers shape memory and superelasticity, which will enhance the ability of the interventional retrieval hook device 60 to conform and to navigate difficult and tortuous anatomies. Further still, the polymer sleeve may comprise elastomeric materials such as silicone, polyurethane, or PTFE, which provides compliance and biocompatible.

[0176] Moreover, the expandable mesh or the polymer sleeve of the retrieval sheath 30 may comprise an expandable geometry, wherein the expandable mesh or the polymer sleeve may be preloaded in a collapsed state and expand upon deployment, either passively (via elastic recoil) or actively (via mechanical actuation). Once expanded, the expandable mesh or the polymer sleeve of the retrieval sheath 30 may form a containment chamber that resists migration and slippage during retrieval of the elements associated with the interventional retrieval hook device 60 and the retained foreign object(s). As such, the expandable geometry of the expandable mesh or the polymer sleeve aids in secure capture and engagement of the retained foreign object(s). Further, the flexible nature of the expandable mesh or the polymer sleeve allows for a minimally traumatic outcome, since the flexible nature of the expandable mesh or the polymer sleeve of the retrieval sheath 30 reduces trauma to surrounding tissue during engagement and withdrawal.

[0177] Indeed, the aforementioned conformability and adaptability of the flared section, the expandable section, or the funnel-shaped section of the retrieval sheath 30 allows it to conform to irregular or variable geometries. This conformability and adaptability allows the retrieval sheath 30 to envelope various retained foreign objects such as displaced or damaged medical devices, catheter fragments, pacemaker leads, biological tissue, embolized tissue or thrombus, displaced or embolized stents, embolism coils, and filters such as vena cava filters, arterial filters, cerebral filters, or any other appropriate filter. Further, this conformability and adaptability allows the retrieval sheath 30 to navigate difficult and tortuous anatomies. Hence, the conformability and adaptability of the flared section, the expandable section, or the funnel-shaped section of the retrieval sheath 30 enhances the ability of the interventional retrieval hook device 60 to securely capture and extract retained foreign objects, dislodged devices, or procedural debris from within a vessel(s), cavity, or organ, and to navigate difficult or tortuous anomalies within a vessel(s), cavity, or organ.

[0178] Indeed, the aforementioned conformability and adaptability of the flared section, the expandable section, or the funnel-shaped section of the retrieval sheath 30 allows for the secure capture and extraction of retained foreign objects, dislodged devices, or procedural debris from within an organ 80, a hollow organ 80 such as the heart or gut, a cavity 80, bodily- 37 -SG Docket No.: 14925-721.600lumens 80 beyond the vasculature, and / or a combination of one or more of the aforementioned anatomical locations and / or vessels.

[0179] In the steps illustrated by FIGS. 3P-3T, the user or practitioner removes the captured stent 70 from the body via the use of the optional retrieval sheath 30 that is introduced over the outer catheter 23, and the entire hook retrieval system may be withdrawn to pull the stent 70 into the optional retrieval catheter 30. An exemplary retrieval sequence using sheath 30 and the snared filter 70 may be shown in FIGS. 3P-3T. Thereafter, with the retrieval hook 10 and filter 70 within the retrieval sheath 30, the entire system may be removed from the patient.

[0180] Specifically, in the step illustrated by FIG. 3P, the retrieval sheath 30 may be initially introduced to advance over or to telescope over the outer catheter 23. In the step illustrated by FIG. 3Q, the retrieval sheath 30 may be advanced to cover or telescope over most of the outer catheter 23, except for the most distal part of the outer catheter 23. In the step illustrated by FIG. 3R, the retrieval sheath 30 may be advanced to fully cover the outer catheter 23 and begin covering and retrieving part of the captured object 70 or stent 70. In the step illustrated by FIG. 3S, the retrieval sheath 30 may be advanced to cover most of the captured stent 70. In the step illustrated by FIG. 3T, the retrieval sheath 30 completely covers the retrieval hook 10 and the captured stent 70 within it, thereby allowing the user or practitioner to remove the entire interventional retrieval hook device 60 and the captured object 70 or captured stent 70 from the patient.

[0181] The process parameters and sequence of steps described and / or illustrated herein are given by way of example only and can be varied as desired. For example, while the steps illustrated and / or described herein may be shown or discussed in a particular order, these steps do not necessarily need to be performed in the order illustrated or discussed. The various example methods described and / or illustrated herein may also omit one or more of the steps described or illustrated herein or include additional steps in addition to those disclosed.

[0182] When a feature or element is herein referred to as being "on" another feature or element, it can be directly on the other feature or element or intervening features and / or elements may also be present. In contrast, when a feature or element is referred to as being "directly on" another feature or element, there are no intervening features or elements present. It will also be understood that, when a feature or element is referred to as being "connected", "attached" or "coupled" to another feature or element, it can be directly connected, attached or coupled to the other feature or element or intervening features or elements may be present.- 38 -SG Docket No.: 14925-721.600In contrast, when a feature or element is referred to as being "directly connected", "directly attached" or "directly coupled" to another feature or element, there are no intervening features or elements present. Although described or shown with respect to one embodiment, the features and elements so described or shown can apply to other embodiments. It will also be appreciated by those of skill in the art that references to a structure or feature that is disposed "adjacent" another feature may have portions that overlap or underlie the adjacent feature.

[0183] Terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. For example, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items and may be abbreviated as " / ".

[0184] Spatially relative terms, such as "under", "below", "lower", "over", "upper" and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is inverted, elements described as "under" or "beneath" other elements or features would then be oriented "over" the other elements or features. Thus, the exemplary term "under" can encompass both an orientation of over and under. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. Similarly, the terms "upwardly", "downwardly", "vertical", "horizontal" and the like are used herein for the purpose of explanation only unless specifically indicated otherwise.

[0185] Although the terms “first” and “second” may be used herein to describe various features / elements (including steps), these features / elements should not be limited by these terms, unless the context indicates otherwise. These terms may be used to distinguish one feature / element from another feature / element. Thus, a first feature / element discussed below could be termed a second feature / element, and similarly, a second feature / element discussed Terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. For example, as used herein, the singular forms- 39 -SG Docket No.: 14925-721.600"a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items and may be abbreviated as " / ".

[0186] Spatially relative terms, such as "under", "below", "lower", "over", "upper" and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is inverted, elements described as "under" or "beneath" other elements or features would then be oriented "over" the other elements or features. Thus, the exemplary term "under" can encompass both an orientation of over and under. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. Similarly, the terms "upwardly", "downwardly", "vertical", "horizontal" and the like are used herein for the purpose of explanation only unless specifically indicated otherwise.

[0187] Although the terms “first” and “second” may be used herein to describe various features / elements (including steps), these features / elements should not be limited by these terms, unless the context indicates otherwise. These terms may be used to distinguish one feature / element from another feature / element. Thus, a first feature / element discussed below could be termed a second feature / element, and similarly, a second feature / element discussed Throughout this specification and the claims which follow, unless the context requires otherwise, the word “comprise”, and variations such as “comprises” and “comprising” means various components can be co-jointly employed in the methods and articles (e.g., compositions and apparatuses including device and methods). For example, the term “comprising” will be understood to imply the inclusion of any stated elements or steps but not the exclusion of any other elements or steps.

[0188] In general, any of the apparatuses and methods described herein should be understood to be inclusive, but all or a sub-set of the components and / or steps may alternatively be exclusive, and may be expressed as “consisting of’ or alternatively “consisting essentially of’ the various components, steps, sub-components or sub-steps.- 40 -SG Docket No.: 14925-721.600

[0189] Although various illustrative embodiments are described above, any of a number of changes may be made to various embodiments without departing from the scope of the invention as described by the claims. For example, the order in which various described method steps are performed may often be changed in alternative embodiments, and in other alternative embodiments one or more method steps may be skipped altogether. Optional features of various device and system embodiments may be included in some embodiments and not in others. Therefore, the foregoing description is provided primarily for exemplary purposes and should not be interpreted to limit the scope of the invention as it is set forth in the claims.

[0190] The examples and illustrations included herein show, by way of illustration and not of limitation, specific embodiments in which the subject matter may be practiced. As mentioned, other embodiments may be utilized and derived there from, such that structural and logical substitutions and changes may be made without departing from the scope of this disclosure. Such embodiments of the inventive subject matter may be referred to herein individually or collectively by the term “invention” merely for convenience and without intending to voluntarily limit the scope of this application to any single invention or inventive concept, if more than one is, in fact, disclosed. Thus, although specific embodiments have been illustrated and described herein, any arrangement calculated to achieve the same purpose may be substituted for the specific embodiments shown. This disclosure is intended to cover any and all adaptations or variations of various embodiments. Combinations of the above embodiments, and other embodiments not specifically described herein, will be apparent to those of skill in the art upon reviewing the above description.SG Docket No.: 14925-721.600

Claims

CLAIMSWhat is claimed are:

1. An interbody retrieval device comprising: at least one hook connected to a shaft; a bend in the shaft, wherein the bend is located below a top of the at least one hook and above a tip of the at least one hook; and an inner catheter and an outer catheter surrounding the shaft, wherein the inner catheter is distally advanced relative to the shaft and over the bend in the shaft to open the at least one hook, wherein the inner catheter is retracted to close the at least one hook, and wherein the tip of the at least one hook may be captured within the outer catheter.

2. The interbody retrieval device of claim 1, wherein the outer catheter is distally advanced relative to the shaft to capture the tip of the at least one hook.

3. The interbody retrieval device of claim 1, wherein the outer catheter is distally withdrawn to expose the top of the at least one hook.

4. The interbody retrieval device of claim 1, wherein the at least one hook is made from a superelastic material.

5. The interbody retrieval device of claim 4, wherein the at least one hook is made from Nitinol.

6. The interbody retrieval device of claim 1, further comprising a control handle, wherein the advancement and retraction of the inner catheter and outer catheter are independently controlled.

7. The interbody retrieval device of claim 1, wherein the object to be retrieved is a stent, a pacemaker lead, an embolized device, a damaged medical device, a vena cava filter,- 42 -SG Docket No.: 14925-721.600an arterial filter, a cerebral filter, an embolism coil, an embolized biological material, or a thrombus.

8. The interbody retrieval device of claim 1, further comprising an additional tip bend formed by bending the at least one hook inwardly from the top of the at least one hook before ending at the tip of the at least one hook.

9. The interbody retrieval device of claim 1, wherein the at least one hook comprises a plurality of hooks.

10. The interbody retrieval device of claim 9, wherein the plurality of hooks bifurcate from a sleeve located in the shaft.

11. The interbody retrieval device of claim 9, wherein each of the plurality of hooks has its own respective shaft.

12. The interbody retrieval device of claim 1, further comprising at least one additional shaft bend formed in the proximal portion of the shaft.

13. The interbody retrieval device of claim 12, wherein the at least one additional shaft bend bends laterally toward the direction of the tip of the at least one hook.

14. The interbody retrieval device of claim 12, wherein the at least one additional shaft bend bends laterally away from the direction of the tip of the at least one hook.

15. The interbody retrieval device of claim 12, wherein the at least one additional shaft bend comprises a plurality of additional shaft bends.

16. The interbody retrieval of claim 15, wherein at least one of the plurality of additional shaft bends, bends laterally toward the direction of the tip of the at least one hook, and at least one of the plurality of additional shaft bends, bends laterally away from the direction of the tip of the at least one hook.- 43 -SG Docket No.: 14925-721.60017. A method for retrieving an object from a human body, said method comprising: providing an interbody retrieval device comprising at least one hook, an inner catheter, and an outer catheter, where the hook contains a hook opening control bend between a top of the at least one hook and a tip of the at least one hook; advancing the at least one hook to a location proximate to an object to be retrieved; advancing the inner catheter over the hook opening control bend to open the at least one hook; advancing the tip of the open hook to a point distal to the proximal end of the object to be retrieved with the open hook, and withdrawing the device to engage the object to be retrieved; withdrawing the inner catheter to close the hook; and advancing the outer catheter over the tip of the at least one hook.

18. The method of claim 17, further comprising advancing a retrieval sheath over the outer catheter and the device.

19. The method of claim 17, further comprising withdrawing the retrieval sheath and the captured object form the body.

20. The method of claim 17, wherein the bend is located below the top of the at least one hook and above the tip of the at least one hook.

21. A method of retrieving an object from a human body, comprising:Advancing an interbody retrieval device in a stowed configuration within an outer catheter to a location proximate to the object;Transitioning a distal portion of a distal hook of the interbody retrieval device from the stowed configuration into an open configuration beyond a distal most end of the outer catheter;Adjusting the orientation of a portion of the tip of the distal hook relative to a shaft by advancing an inner catheter over a control bend in the shaft;Engaging a portion of the object with the distal hook;Advancing the outer sheath to close the distal hook and secure the object to the outer catheter.- 44 -SG Docket No.: 14925-721.60022. The method of claim 21 further comprising: advancing a retrieval sheath over the outer catheter and withdrawing the object into the retrieval sheath.

23. The method of claim 21, wherein the step of adjusting the orientation of a portion of the distal hook by advancing an inner catheter over the control bend produces a curved direction of motion of a top of the distal hook.

24. The method of claim 21, wherein the step of adjusting the orientation of a portion of the distal hook by advancing an inner catheter over the control bend separates the tip of the hook from the shaft.

25. The method of any of claims 21, 22, 23 or 24, wherein after performing the advancing the outer sheath step, the object secured to the outer catheter is a stent, a pacemaker lead, an embolized device, a damaged medical device, a vena cava filter, an arterial filter, a cerebral filter, an embolism coil, an embolized biological material, or a thrombus.- 45 -SG Docket No.: 14925-721.600

Images