Fine wire cutting device

Abstract

A filament cutting device may include an outer sheath. A bushing may be coupled to a distal end of the outer sheath. The inner diameter of the liner may be a cutting edge located at a distal tip of the liner. An actuation wire may slidably extend within the outer sheath and bushing. An engagement body may be coupled to a distal end of the actuation wire. A chamber may be defined along a length of the joined body, the chamber configured to capture a portion of the filament within the chamber. Movement of the actuation wire and an assembly with the filament captured within the chamber may cause the cutting edge to sever the filament.

Description

This application is a divisional application of the Chinese application with application date of October 15, 2020, application number 202080071314.4, and name “Filament Cutting Device”. CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims the benefit of priority under 35 U.S.C. §119 to U.S. Provisional Application No. 63 / 011,388, filed on April 17, 2020; and U.S. Provisional Application No. 62 / 923,042, filed on October 18, 2019, the entire contents of which are incorporated herein by reference for all purposes. Technical Field

[0002] The present invention relates generally to the field of devices and procedures for severing filaments, and in particular to devices for severing filaments of a tethered device as part of a tethered traction system and procedure. Background Art

[0003] Accessing and severing one or more filaments during a medical procedure, such as filaments used as tethers in tissue dissection procedures, may be difficult for a medical professional to perform due to remote access to the filaments, visualization, tortuous anatomy, establishing sufficient shear force, etc.

[0004] A variety of beneficial medical outcomes can be achieved through embodiments of the present invention. Summary of the invention

[0005] Various embodiments of filament cutting devices, systems, and methods are described herein. For example, a filament cutting device is described for use in a system including a tether device having a filament, which can be delivered to a patient's body cavity and deployed to apply traction to tissue during an anatomical procedure, such as an endoscopic mucosal resection and / or endoscopic submucosal dissection (EMR / ESD), and can be retrieved after surgery by cutting the filament with such a filament cutting device. An exemplary tether device and / or tether delivery device is also described herein for use together, alone, and / or in combination with a filament cutting device in such a system or other systems.

[0006] In one aspect, a filament cutting device may include an outer sheath. A sleeve may be coupled to the distal end of the outer sheath. The inner diameter of the sleeve may include a cutting edge. An actuation line may extend slidably within the outer sheath and the sleeve. An engagement body may be coupled to the distal end of the actuation line. The engagement body may include an outer surface having a diameter that substantially matches the inner diameter of the cutting edge of the sleeve. A chamber may be defined along the length of the engagement body, the chamber being configured to capture a portion of the filament within the chamber. Movement of the actuation line and the engagement body with the filament captured within the chamber may cause the cutting edge to cut the filament.

[0007] In various aspects of the above and other aspects, the proximal portion of the chamber may include an angled inclined surface. The distal portion of the chamber may include an innermost curved portion of the chamber defining a hook shape. The innermost curved portion of the chamber may extend radially within the coupling body for a length that is 50% greater than the diameter of the coupling body. The cutting edge may be located at the distal tip of the sleeve. The cutting chamber may be defined along the length of the sleeve, and the cutting edge may be along the cutting chamber. The outer sheath may include a winding coil, and the distal tip of the outer sheath may include a ground outer surface, wherein the sleeve is coupled to the outer sheath. The proximal portion of the outer sheath may include an inner diameter smaller than the remainder of the outer sheath, and the proximal portion of the outer sheath may include an outer diameter smaller than the remainder of the outer sheath. The coupling body may include a second chamber opposite to the first chamber around the longitudinal axis of the coupling body. The coupling body may include a substantially square periphery that substantially matches the inner periphery of the sleeve.

[0008] In one aspect, a filament cutting device may include an outer sheath. A sleeve may be coupled to the distal end of the outer sheath. A chamber may be defined along the length of the sleeve and may be configured to capture a portion of the filament within the chamber. An actuation line may extend slidably within the outer sheath and the sleeve. A coupling body may be coupled to the distal end of the actuation line. The coupling body may include a cutting edge located at the distal tip of the coupling body. Movement of the actuation line and the coupling body with the filament captured in the chamber may cause the cutting edge to cut the filament.

[0009] In various aspects of the aspects and other aspects, the cutting edge can be the outer diameter of the engaging body. The distal tip of the engaging body can include a surface having an angle extending from the longitudinal axis of the engaging body to the cutting edge. The contact body can be disposed in the distal end of the bushing, the contact body being configured to prevent the engaging body from translating distally. The contact body can include a tapered proximal portion that tapers proximally with a reduced width. The engaging body can include a tapered distal portion that tapers distally with a reduced width.

[0010] In one aspect, a filament cutting device may include an outer sheath. A sleeve may be coupled to the distal end of the outer sheath. The sleeve may include a chamber. A cutter may extend through the chamber and may be configured to cut the filament. The chamber may be defined along the length of the sleeve and may be configured to capture a portion of the filament within the chamber. The cutter may be a blade having an edge extending substantially parallel to the longitudinal axis of the filament cutting device. The chamber may be defined laterally through the distal tip of the sleeve. The cutter may be an activatable wire configured to melt the filament.

[0011] In one aspect, a filament cutting device may include an outer sheath. A sleeve may be coupled to the distal end of the outer sheath. The inner diameter of the sleeve may be a cutting edge located at the distal tip of the sleeve. An actuation line may extend slidably within the outer sheath and the sleeve. A coupling body may be coupled to the distal end of the actuation line. The coupling body may include an outer surface having a diameter that substantially matches the inner diameter of the cutting edge of the sleeve. A chamber may be defined along the length of the coupling body and may be configured to capture a portion of the filament within the chamber. Movement of the actuation line and the coupling body with the filament captured within the chamber may cause the cutting edge to cut the filament. The filament may be at least partially positioned in the chamber of the coupling body so that in response to the proximal movement of the coupling body into the sleeve, the filament may be cut via the edge of the sleeve and / or the chamber.

[0012] In another aspect, a system can include a filament cutting device, such as the filament cutting device described above and in other aspects herein. The system can include a tether device. The system can include a tether delivery device.

[0013] In one aspect, a tether device can include a tether having a distal end, a proximal end, and a stretchable elongated body extending between the distal end and the proximal end. The proximal end of the tether can be configured to be attached to a deployable clamping device at the distal end of a delivery catheter. The distal end of the tether can be configured with a ring extending from a neck. The ring can be configured to be engaged by a second deployable clamping device at the distal end of the delivery catheter. The ring and neck can include a filament that can be cut by a filament cutting device, such as, the filament cutting device described above and in other aspects of this article.

[0014] In another aspect, a method may include extending an engagement body of a filament cutting device toward a filament. The filament may be captured within a cavity of the engagement body. The engagement body may be retracted into an outer sheath, thereby severing the filament. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Non-limiting embodiments of the present invention are described by way of example with reference to the accompanying drawings which are schematic and are not intended to be drawn to scale. In the drawings, each identical or nearly identical component shown is generally represented by a single numeral. For clarity, not every component is labeled in every figure, and not every component of every embodiment is shown without necessary description for one skilled in the art to understand the present invention. In the drawings:

[0016] Figure 1 A filament cutting device according to one embodiment of the present invention is shown.

[0017] Figure 2 An actuating element and inner sheath of a filament cutting device according to one embodiment of the present invention are shown.

[0018] Figure 3ALongitudinal translation of a filament cutting device is shown according to one embodiment of the present invention.

[0019] Figure 3B Shows Figure 3A Rotation of the filament cutting device.

[0020] Figure 3C Shows Figure 3A and Figure 3B Cross-sectional view of the proximal end of the device.

[0021] Figure 3D Shows FIG. 3A to FIG. 3C A cross-sectional stereoscopic view of the proximal end of the device.

[0022] Figure 4A A proximal portion of an assembled filament cutting device is shown in accordance with one embodiment of the present invention.

[0023] Figure 4B Shown partially unassembled Figure 4A device.

[0024] FIG. 5A to FIG. 5D The distal end of a filament cutting device is shown translating longitudinally and engaging and severing a filament in accordance with one embodiment of the present invention.

[0025] Figure 6 The outline of the cavity of the engaging body of the filament cutting device according to one embodiment of the present invention is shown.

[0026] Figure 7 is a cross-sectional view of a bushing having an edge according to one embodiment of the present invention.

[0027] Figure 8 An outer sheath of a filament cutting device according to one embodiment of the present invention is shown.

[0028] Fig. 9 An engaging body of a filament cutting device according to an embodiment of the present invention is shown.

[0029] FIG. 10A to FIG. 10D The distal end of a filament cutting device is shown translating longitudinally and engaging and severing a filament in accordance with one embodiment of the present invention.

[0030] Fig.11A and Fig. 11B An engaging body and a bushing according to one embodiment of the present invention are shown.

[0031] Fig.12 A joining body according to an embodiment of the present invention is shown.

[0032] FIG. 13A to FIG. 13DAn engagement body is shown in various positions relative to a bushing for engaging and severing a filament in accordance with one embodiment of the present invention.

[0033] Fig.14 An engaging body and a bushing according to one embodiment of the present invention are shown.

[0034] Fig.15 An engaging body and a bushing according to one embodiment of the present invention are shown.

[0035] FIG. 16A to FIG. 16C An engagement body is shown in various positions relative to a bushing for engaging and severing a filament in accordance with one embodiment of the present invention.

[0036] Fig.17 A bushing having a cutter as a blade is shown according to one embodiment of the present invention.

[0037] Fig.18 A bushing having a cutter that is an activatable wire is shown according to one embodiment of the present invention.

[0038] Fig.19 A tether device and a clip delivery device according to one embodiment of the present invention are shown.

[0039] Fig. 20 A tether device deployed in a body cavity is shown according to one embodiment of the present invention. DETAILED DESCRIPTION

[0040] The present invention is not limited to the specific embodiments described herein. The terms used herein are only used to describe specific embodiments and are not intended to be limited beyond the scope of the appended claims. Unless otherwise specified, all technical terms used herein have the same meaning as those generally understood by ordinary technicians in the field to which the present invention belongs.

[0041] 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. When used herein, the terms "include" and / or "comprise" or "include" and / or "include" indicate the presence of the features, regions, steps, elements and / or components, but do not exclude the presence or addition of one or more other features, regions, integers, steps, operations, elements, components and / or groups. As used herein, the conjunction "and" includes each of the structures, components, features, etc. so connected, unless the context clearly indicates otherwise, and the conjunction "or" includes one or the other of the structures, components, features, etc. so connected, individually and in any combination and quantity, unless the context clearly indicates otherwise. The term "or" is generally used in a sense that includes "and / or", unless the content clearly indicates otherwise.

[0042] Certain embodiments of the present invention have been described above. As used herein, "proximal" refers to the end of the device that is located closest to the medical professional when the device is introduced into the patient's body, and "distal" refers to the end of the device or object that is located farthest from the medical professional during implantation, positioning or delivery along the device.

[0043] All numerical values ​​are assumed to be modified by the term "about" herein, regardless of whether or not explicitly indicated. In the context of numerical values, the term "about" generally refers to a numerical range that is considered by those skilled in the art to be equivalent to the quoted value (i.e., having the same function or result). In many cases, the term "about" may include a number rounded to the nearest significant figure. Unless otherwise specified, the term "about" (i.e., in the context other than numerical values) may be assumed to have its common and customary definition, as understood and consistent with the context of this specification. The reference to the numerical range represented by the endpoint includes all numbers within the range, including the endpoint (e.g., 1 to 5 includes 1, 1.5, 2, 2.75, 3, 3.80, 4 and 5).

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

[0045] Throughout the invention, although embodiments of filament cutting devices, tether devices, and / or tether delivery devices may be described with specific reference to medical devices and systems and procedures within the digestive system, it should be understood that such medical devices and methods may be used in conjunction with tissues of the abdominal cavity, gastrointestinal system, thoracic cavity, urinary tract, and reproductive tract, etc. Moreover, a variety of medical procedures may benefit from the presently disclosed medical devices and procedures, including, for example, endoscopic submucosal dissection (ESD), peroral endoscopic myotomy (POEM), cholecystectomy, and video-assisted thoracoscopic surgery (VATS). The structures and configurations and deployment methods may find utility beyond resection for purposes of stability, manipulation, and providing clear vision.

[0046] refer to Figure 1, depicts an embodiment of a filament cutting device comprising an outer sheath 108 for extending within a body cavity of a patient. A filament may be a component that connects other elements together to perform a medical procedure (see Fig.19 and Fig. 20 ), or the filament may be a suture for suturing or other closure of tissue. After performing a medical procedure, it may be necessary to cut the filament to complete the procedure and remove the assembly from the patient.

[0047] The distal end of the outer sheath 108 of the device is shown with a coupling 100 extending distally from the outer sheath 108. The coupling 100 can extend distally and proximally through the outer sheath 108. The outer sheath 108 can be formed as a coil, for example, to allow for increased bending motion in tortuous anatomical structures. The proximal end of the device includes a handle 140 for manipulating the device and coupling 100 relative to the outer sheath 108. The handle 140 is depicted as having a finger slide 120 for translating the coupling 100 relative to the outer sheath 108 along the longitudinal axis of the device, and a knob 122 for rotating the coupling 100 about the longitudinal axis.

[0048] refer to Figure 2 , an embodiment of the actuating element 230 is depicted as being within the inner sheath 232. The actuating element 230 can be connected to the joint body so that the actuating element 230 and / or the inner sheath 232 can be translated proximally or distally or can be rotated around the longitudinal axis of the device to manipulate the joint body relative to the outer sheath of the device. The actuating element 230 can slide relative to the inner sheath 232, or it can extend axially together. The inner sheath 232 and the actuating element 230 can be disposed within the outer sheath of the device. The actuating element 230 can include a harder material than the inner sheath (e.g., Nitinol, etc.) so that the actuating element 230 can be translated axially through the inner sheath 232 and / or the device. The inner sheath 232 can include a material that is not as hard as the actuating element 230 (e.g., PTFE, etc.) so that the harder actuating element 230 is reduced in contact with the outer sheath. The actuation element 230 can be axially translated within the inner sheath 232 without substantially contacting the outer sheath, thereby reducing friction between the substantially axial translation of the actuation element 230 and the outer sheath. The actuation element 230 and / or the inner sheath 232 can be coated with, for example, silicone, etc. to reduce friction. The actuation element 230 can be, for example, a wire, a rod, etc. The actuation element 230 described herein or otherwise described within the scope of the present invention, such as an actuation wire, may or may not include the inner sheath 232.

[0049] refer to Figure 3A, an embodiment of a filament cutting device is shown, which includes an outer sheath 308 extending from a proximal end of the device to a distal end of the device. A slidable body 320 (e.g., a finger slide) can be axially translated (e.g., in the direction of arrow 327) along the longitudinal axis of a handle 340 by a hand of a medical professional (e.g., an index and middle finger of the hand) at the proximal end of the device to cause the actuation wire 310 and the engagement body 300 to axially translate relative to the outer sheath 308 and the filament 330 to be cut. It should be understood that in some embodiments, the handle 340 can translate the outer sheath 308 relative to the axial movement of the actuation wire 310 and the engagement body 300, so that the outer sheath 308 can be retracted and advanced while the actuation wire 310 and the engagement body 300 remain stationary.

[0050] refer to Figure 3B , showing Figure 3A A filament cutting device having a rotatable body 322 at a handle 340 that can be rotated by a medical professional's hand (e.g., the thumb and fingers of the hand) about a longitudinal axis of the proximal end of the device (e.g., in the direction of arrow 325) to rotate the actuation wire 310 and the coupling body 300 relative to the outer sheath 308 and the filament 330 to be cut.

[0051] refer to Figure 3C and Figure 3D , showing an actuation wire 310 extending through the proximal end of the device Figure 3A and Figure 3B 321, which is a cross-sectional view of a handle 340 at the proximal end of a filament cutting device. The proximal end of the actuation wire 310 is coupled to a shaft 321, which is rotatably coupled to a slidable body 320. Axial translation of the slidable body 320 causes axial translation of the shaft 321 and the actuation wire 310. The actuation wire 310 is coupled to a tubular member 323. The tubular member 323 extends through the rotatable member 322, so that rotation of the rotatable member 322 causes rotational translation to the tubular member 323 and the actuation wire 310. In various embodiments, the tubular member 323 can be a cannula, a hypotube, or the like, and can have a cross-sectional shape that is circular, oval, square, rectangular, combinations thereof, or the like, for translational rotation between the rotatable member 322 and the actuation wire 310. The tubular member 323 may extend only within the proximal end of the filament cutting device (e.g., only within the handle 340), or the tubular member 323 may extend distally along the actuation wire 310 to the distal end of the filament cutting device. In various embodiments, the actuation wire 310 may include an inner sheath (e.g., Figure 2 The inner sheath 232 of the embodiment of the present invention. The inner sheath can also be connected to the shaft 321. In various embodiments, the tubular member can be an inner sheath (e.g., Figure 2 Inner sheath 232).

[0052] refer to Figure 4A, shows the proximal portion of an assembled filament cutting device according to one embodiment of the present invention, which includes a handle 440. The handle 440 includes a slidable body 420 for axial manipulation of the device and a rotatable body 422 for rotational manipulation of the device. The mechanical parts for axial and rotational movement can be configured as described above with respect to Figures 1 to 3D The proximal portion of the outer sheath 408 includes a strain relief tube 409 coupled to the outer surface of the outer sheath 408 by a heat shrink tubing 411. The strain relief tube 409 may include a material such as polypropylene. Figure 4B Shows Figure 4A The unassembled device is provided so as to expose the proximal end 409p of the strain relief tube 409, which includes a flare having a larger outer diameter and inner diameter than the remainder of the tube 409. The proximal end 409p of the tube 409 is coupled to the handle 440 by securing the proximal end 409p to the threaded protrusion 444. The actuation wire 410 extends from the handle 440, through the threaded protrusion 444, and through the outer sheath 408. The flare of the proximal end 409p can be placed above and / or near the protrusion 444 along the actuation wire 410 to assemble the device. The strain relief tube 409 is coupled to the handle 440 by a cap 442 that cooperates with the threaded protrusion 444, so that the flare of the proximal end 409p of the tube 409 is held (e.g., compressed, constrained, etc.) between the cap 442 and the threaded protrusion 444. The heat shrink tubing 411 couples the strain relief tube 409 to the outer jacket when melted such that the proximal end 411 p of the heat shrink tubing is bonded to the strain relief tube 409 and the distal end 411 d of the heat shrink tubing 411 is bonded to the outer jacket 408 .

[0053] refer to Figure 5A , shows the distal end of an embodiment of a filament cutting device, which includes an engagement body 500 that can extend distally from a hub 502 coupled to a distal end of an outer sheath 508. The engagement body 500 can extend distally relative to the filament 530 for severing via translation of an actuation wire 510 coupled to the engagement body 500 relative to the outer sheath 508.

[0054] In various embodiments, the outer diameter of the engagement body can be substantially matched with the inner diameter of the bushing. The bushing can be a cylindrical tube for receiving a substantially cylindrical engagement member. One or both of the engagement body and the bushing can be substantially straight along the longitudinal axis of the engagement body and / or the bushing. The engagement body and / or the bushing can be configured so that one or both are more rigid than the actuation line for the engagement body (e.g., an engagement body wider or thicker than the actuation line) and / or the shaft of the outer member connected to the bushing. The more rigid construction of the engagement body and / or the bushing can provide strength to cut off the filaments of the combined work, while the actuation line and the outer member shaft with less rigidity for the bushing can provide flexibility to navigate in tortuous anatomical structures and can allow bending along the path of the anatomical structure. Compared with the bushing, the relative rigidity and width of the engagement body can also improve the pushability of the engagement body through the outer member. Lubricating fluid or coating can be applied to one or both of the bushing and / or the engagement body so that it can slide relative to each other. In various embodiments, the interface or bushing may include stainless steel, 304 stainless steel, Nitinol, polymers, and the like.

[0055] refer to Figure 5B , Figure 5A The engaging body 500 is translated proximally relative to the sleeve 502 and the filament 530. The filament 530 is captured in the substantially radial chamber 512 of the engaging body 500. The filament 530 can be captured by the proximal translation of the engaging body 500, wherein the filament 530 slides along the outer surface of the engaging body 500. The filament 530 can slide along the angled inclined surface 503 of the proximal portion of the engaging body 500 that defines the periphery of the chamber 512. The angled inclined surface 503 can be used for the introduction of the filament 530 until contacting the innermost curved portion of the chamber 512 that defines the hook 505. The hook 505 can be formed so that the filament 530 passes through the sleeve 502 substantially vertically when the engaging body 500 is aligned with the sleeve 502. For example, the innermost curved portion of the chamber 512 can be defined on both sides of the engaging body 500. Each side can be positioned relative to each other such that the filament 530 can be perpendicular relative to the coupling body 500 and / or the sleeve 502. That is, one side of the filament may not be positioned at an angle relative to the coupling body 500 or the sleeve 502 that is different from the other side of the filament passing through the coupling body 500 or the sleeve 502. The filament 530 can be prevented from moving distally beyond the chamber 512 by the distal portion 501 of the coupling body 500 extending proximally at the periphery of the chamber 512. Although the chamber 512 is depicted as a hole comprising a cavity of the coupling body 500, in various embodiments, the coupling body 500 can be solid and the radial chamber 512 can alternatively be defined by a solid coupling body 400 (e.g., as shown in FIG. 5A ). FIG. 10A to FIG. 10DIn various embodiments, the angled, sloped surface 503 can be consistent with the remainder of the perimeter of the chamber 512, can be wider at the surface 503 and consistent along the remainder of the perimeter of the chamber 512, or can be wider at the angled, sloped surface 503 and taper along the perimeter of the chamber 512. The wider surface 503 and / or the tapered outer perimeter of the chamber 512 can assist in capturing and positioning the filament 530 within the chamber 512.

[0056] refer to Figure 5C , Figure 5A and Figure 5B The engagement body 500 can be relative to the outer sheath 508 and translated proximally within the sleeve 502 of the outer sheath 508, wherein the filament 530 is captured within the chamber 512. The sleeve 502 includes a cavity defined by a substantially sharp edge 504 (e.g., compared to an atraumatic blunt outer edge or surface of the distal end of the sleeve 502) at the distal end of the sleeve 502. The engagement body 500 is substantially straight along the longitudinal axis of the engagement body 500 and aligned with the sleeve 502. The outer diameter of the engagement body 500 can be substantially matched or slidably fitted with the inner diameter of the sleeve 502 at the edge 504, so that when the filament 530 is translated proximally to the edge 504 through the chamber 512 of the engagement body 500, the shear force between the edge 504 and the outer surface of the engagement body 500 or the edge defining the distal portion of the chamber 512 cuts the filament 530. In various embodiments, the edge defining the chamber 512 (eg, the hook portion 505 of the chamber) can be substantially sharp and / or the edge 504 of the sleeve 502 can be substantially sharp. In various embodiments, the sleeve 502 and the outer sheath 508 can translate distally relative to the junction 500 and the filament 530.

[0057] refer to Figure 5D , FIG. 5A to FIG. 5C The coupling body 500 can be translated proximally within the sleeve 502 and the outer sheath 508 such that a severed portion (not shown) of the filament 530 is captured within the sleeve 502 and / or the outer sheath 508 for removal. It should also be understood that the filament 530 can be severed at a single point by the sleeve 502 and / or the chamber 512 such that no additional portion of the filament 530 is captured within the sleeve 502 and / or the outer sheath 508. The device can be removed from the patient with the severed filament 530 temporarily (e.g., a grasper or other end effector can secure and remove the severed filament 530) or permanently retained within the patient.

[0058] refer to Figure 6, a side view profile (and accompanying detailed view) of a chamber 612 of an embodiment of a coupling body 600 is shown. The coupling body 600 includes a reduced outer diameter along the coupling body 600 in a proximal direction to the proximal portion of the coupling body 600 that can be connected to the actuation line. The diameter can be tapered to guide in the coupling body 600 relative to the sleeve and / or the outer sheath without precise alignment (e.g., axially along the longitudinal axis of any one / two of the coupling body 600 and the sleeve). In some embodiments, the coupling body 600 can be a constant diameter along its length. The chamber 612 can have a depth 622 from the outer surface of the coupling body 600, which is 50% greater than the outer diameter 620 of the coupling body 600. In various embodiments, the depth 622 can have a length of about 50% of the outer diameter 620. The profile of the chamber 612 can have a variety of shapes, including a hook-like shape, which can help to keep the filament when contacting the innermost surface of the chamber 612. Exemplary dimensions of the profile of the chamber 612 may include, for example, an angled lead-in surface of the proximal portion of the chamber 612 including an angle of about 30° with the outer surface of the junction 600. The angled lead-out surface distal to the angled lead-in proximal surface of the chamber 612 may include an angle of about 50° with the outer surface of the junction 600. The angles herein may be varied and selected as desired depending on a given application, for example, the angled lead-in proximal surface and / or the angled lead-out surface of the chamber 612 may be about 0° to about 90° with the outer surface of the junction 600. It should be understood that other dimensions are contemplated and are within the scope of the present invention.

[0059] In various embodiments, the coupling body and / or the bushing may include a chamber as described herein. The filament may be captured by axial translation of one or both of the coupling body or the bushing. The filament may slide along the outer surface of the coupling body and / or the bushing. The filament 530 may slide along the angled inclined surface of the proximal or distal portion of the coupling body 500 or the bushing that defines the periphery of the chamber 512. The filament may be prevented from moving out of and / or exceeding the chamber (e.g., forming a hook-like shape) by contacting the periphery of the chamber extending back toward the opposite end of the chamber.

[0060] refer to Figure 7, a cross-sectional view of an embodiment of a bushing is shown, which includes a cavity 704 therethrough. Cavity 704 has a proximal portion 704p having a wider diameter than a distal portion 704d, so that the proximal portion 704p of cavity 704 can be disposed around the distal end of the outer sheath. The distal portion 704d of cavity 704 has a diameter 706, which can substantially match the outer diameter of the engagement body, so that the inner edge 708 of the bushing distal end can create a shear force sufficient to cut the filament with the engagement body. The bushing can be fixedly coupled to the distal end of the outer sheath, for example, by welding, soldering, brazing, adhesives, gluing, mechanical fasteners, etc. In some embodiments, the outer sheath and bushing can be formed integrally, and in other embodiments, the outer sheath and bushing can be combined together.

[0061] refer to Figure 8 , shows an embodiment of an outer sheath 808 including a coiled body (with accompanying cross-sectional views along lines AA and BB, respectively). The coiled body can be formed with a variable outer diameter on one or more mandrels. The outer sheath 808 with a coiled body can allow for more radial flexibility and axial stiffness compared to a solid uniform wall outer sheath. The proximal portion 808p of the outer sheath 808 has a smaller inner diameter and a smaller outer diameter than the remainder of the outer sheath 808, which can assist in maintaining a lower profile and maneuverability compared to the remainder of the device. The proximal portion 808p of the outer sheath 808 extends distally to a tapered portion 808t of the outer sheath 808. The tapered portion 808t includes an outer diameter that increases distally and an inner diameter that increases distally. The tapered portion 808t extends to a distal portion 808d of the outer sheath 808, which is depicted as having a substantially uniform outer diameter. The distal portion 808d can be processed by grinding (e.g., longitudinal grinding, polishing, etc.) to form a substantially uniform outer diameter. The diameter of the distal portion 808d of the outer sheath 808 can substantially match or slide fit with the inner diameter of the working channel of the endoscope (e.g., about 2.8 mm, etc.). The distal tip 809 of the outer sheath 808 extending from the distal portion 808d can be ground, for example, Figure 8 As shown, the distal tip 809 is ground more than the distal portion 808d, so that the outer diameter of the distal tip 809 is smaller than the outer diameter of the distal portion 808d. The outer diameter of the distal tip 809 can substantially match the inner diameter of the proximal portion of the lumen of the bushing, so that the bushing can be disposed on the distal tip 809 and can be attached to the distal tip 809, and the outer diameter of the bushing can substantially match the outer diameter of the distal portion 808d of the outer sheath 808. The inner diameter of the distal tip 809 can match the inner diameter of the distal portion 808d of the outer sheath 808 and the inner diameter of the distal portion of the bushing, so that the engagement body can slide and translate within the distal portion 808d of the outer sheath 808 and the distal tip 809 and pass through the bushing. In various embodiments, the outer sheath 808 can have a substantially uniform outer diameter along its length.

[0062] refer to Fig. 9 , shows a coupling body 900 including a transverse distal tip 900t surface transitioning to an inclined surface 901, which extends proximally at an angle along the longitudinal axis of the coupling body 900. The inclined surface 901 is substantially distal to a chamber 912 of the coupling body 900 along the length of the coupling body 900. The chamber 912 is shown as being formed within or defined by a solid body of the coupling body 900, however, the chamber 912 may also include a substantially radial hole formed within the coupling body 900. The inclined surface 901 transitions to an outer circumferential surface 903 of the coupling body 900 in a proximal direction and continues to extend to the chamber 912. As described with respect to FIG. 10A to FIG. 10D As shown in and discussed in the inclined surface of the joint body, the inclined surface 901 can assist in capturing the filament in the chamber 912 of the joint body. Between the inclined surface 901 and the outer circumferential surface 903 and the transition portion from the outer circumferential surface 903 to the chamber 912 can each include fillet 902 (e.g., rounded surface, smooth surface, non-damaged surface, etc.). Compared with the non-rounded edge, the fillet 902 can reduce the friction with the other parts of the device, another device and / or the patient's anatomical structure. During surgery, the axial observation of the joint body 900, the part of the joint body 900 and / or the orientation of the joint body 900 or the chamber 912 may be difficult to identify for medical professionals. Compared with other surfaces of the joint body 900, the fillet 902 can provide a surface that medical professionals can identify (e.g., by reflecting light at different angles or reflecting light in a shape different from other surfaces of the joint body 900).

[0063] refer to FIG. 10A to FIG. 10D , showing a similar FIG. 5A to FIG. 5D The distal end of the embodiment of the filament cutting device discussed. FIG. 10A to FIG. 10DIn the embodiment of the present invention, the distal portion of the joint body 1000 includes an inclined surface 1001. For example, when the actuation wire 1010 and the joint body 1000 are translated distally to contact the filament 1030, the inclined surface 1001 can slide along the filament 1030. During the contact of the joint body 1000 with the filament 1030 traveling distally, the filament 1030 can slide proximally toward the chamber 1012 of the joint body 1000 along the inclined surface 1001. Compared with the distal tip of the joint body 1000 having a substantially transverse surface that may collide with the filament 1030 and guide the filament 1030 away from the chamber 1012, making the distal tip of the joint body 1000 including the inclined surface 1001 in contact with the filament 1030 can more easily facilitate the capture of the filament 1030 in the chamber 1012. The coupling body 1000 can include a radiused surface along the exterior of the coupling body from the distal tip to the chamber 1012 to help prevent the filament 1030 from being damaged or cut prematurely. By translating the coupling body 1000 proximally relative to the outer sheath 1008, the filament 1030 can be captured within the chamber 1012 and retracted proximally to be cut within the sleeve 1002 of the outer sheath 1008. The coupling body 1000 can remain stationary after capturing the filament 1030, and the sleeve 1002 and the outer sheath 1008 can be extended distally to cut the filament 1030 when the coupling body 1000 is received into the outer sheath 1008. The coupling body 1000 can translate distally relative to the sleeve 1002 to eject the cut portion 1031 of the filament 1030.

[0064] In various embodiments, the filaments can be severed in a variety of ways. For example, the filaments can be severed by an incision, plastic fracture, tension fracture, etc., which can be performed by a cutter that is mechanical, electrical, chemical, etc. In various embodiments, the filaments of the device can be cut during or at the end of a medical procedure. The filaments can be severed for a variety of reasons, for example, to release the device, to remove a filament such as a suture, to release tension between the device, between the device and the anatomical structure, between the anatomical structure, between a first portion of the anatomical structure and a second portion of the anatomical structure, etc.

[0065] refer to Fig.11A and Fig. 11B, an embodiment of a coupling body 1100 and a sleeve 1102 is shown. As described herein, the coupling body 1100 can be coupled to an actuation line and the sleeve 1102 can be coupled to an outer sheath. The coupling body 1100 can slide in the cavity 1104 of the sleeve 1102. The coupling body 1100 has a non-circular periphery (e.g., square, rectangular, polyhedron, etc.) that substantially matches the non-circular cavity 1104. The chamber 1112 of the coupling body 1100 can be used to capture the filament 1130, to cut off the filament 1130 between the chamber 1112 and the sleeve 1102 via the translation of the coupling body 1100 toward the sleeve 1102 and / or the translation of the sleeve 1102 toward the coupling body 1100. In an embodiment, such as the illustrated embodiment, the periphery of the coupling body 1100 and the chamber 1112 does not include any curved surface. In some embodiments, the non-circular perimeter geometry of the engagement body 1100 may be advantageous because fewer inputs, less time, and / or less tolerance control may be used compared to other aspects of manufacturing.

[0066] refer to Fig.12, shows an embodiment of a joint 1200, which includes a first chamber 1212 and a second chamber 1213. The chambers 1212, 1213 are oriented substantially opposite to each other around the longitudinal axis l of the joint 1200. The second chamber 1213 allows another portion of the joint 1200 to capture the filament. The substantially opposite orientation of the chambers 1212, 1213 allows minimal rotation of the joint 1200 in order to capture the filament (i.e., a smaller rotation of the joint member 1200 around the longitudinal axis l may be required to expose the chambers 1212, 1213 to the filament compared to the larger rotation required for the embodiment with only the first chamber 1212). The two chambers 1212, 1213 are arranged so that they have a depth extending through the longitudinal axis l (i.e., more than 50% of the outer diameter of the joint 1200); however, in various embodiments, the chambers may extend to the longitudinal axis l or be radially shorter than the longitudinal axis l. For example, the chambers 1212, 1213 may be relatively close to the outer surface of the joint 1200, so that the chambers 1212, 1213 may not extend radially beyond the longitudinal axis 1. The chambers 1212, 1213 may overlap each other along the longitudinal axis 1 and may also overlap radially transversely through the longitudinal axis 1. However, the chambers 1212, 1213 may be arranged so that they may not overlap each other along the longitudinal axis 1, may not overlap radially transversely through the longitudinal axis 1 and / or may not be arranged substantially opposite to each other around the longitudinal axis 1. Although two chambers 1212, 1213 are shown, any number of chambers may be used, for example, 0, 1, 3, 4, 5, 8, 10, 20, etc. Although the chambers 1212, 1213 are shown as being arranged at about 180° around the longitudinal axis 1, any angled arrangement may be used, for example, about 60°, about 90°, about 120°, about 150°, etc.

[0067] refer to Fig.13A , an embodiment of a coupling 1300 and a sleeve 1302 is shown. As described herein, the coupling 1300 can be coupled to an actuation wire and the sleeve 1302 can be coupled to an outer sheath. The coupling 1300 can slide within a cavity 1304 of the sleeve 1302. The coupling 1300 includes a substantially radial first chamber 1312 and an angled inclined surface 1303 of a proximal portion of the coupling 1300 that defines the periphery of the first chamber 1312. The angled inclined surface 1303 of the first chamber 1312 extends to the innermost bend of the first chamber 1312, thereby defining a hook portion at a second surface 1305 of the first chamber 1312. Although the first chamber 1312 is depicted as a hole that includes a cavity of the coupling 1300, in various embodiments, the coupling 1300 can be solid and the radial chamber 1312 can alternatively be defined by a solid coupling 1300 (e.g., as FIG. 10A to FIG. 10D13). The bushing 1302 includes a substantially radial second chamber 1313 extending into the cavity 1304. The second chamber 1313 includes a proximal surface 1314 and a distal surface 1315 that intersect at a curved middle portion 1316 of the second chamber 1313. The proximal surface 1314 and the distal surface 1315 are angled such that the exteriors of the surfaces 1314, 1315 are further from each other (i.e., toward the middle portion 1316) than the interiors of the surfaces 1314, 1315. This orientation of the proximal and distal surfaces 1314, 1315 of the second chamber 1313 forms the periphery of the second chamber 1313 such that the second chamber 1313 has a wider exterior at the outer surface of the joint 1300 and a narrower interior at the curved middle portion 1316.

[0068] refer to Fig. 13B , Fig.13A The first and second chambers 1312, 1313 can be substantially aligned to receive and capture the filament 1330. The sleeve 1302 can extend distally so that the filament 1330 enters the widest outer portion of the second chamber 1313. The filament 1330 can move along the angled periphery of the second chamber 1313 into the second chamber 1313. The second chamber can guide the filament 1330 proximally toward the narrowest interior of the second chamber 1313. When the chambers 1312, 1313 are aligned, inside the second chamber 1313, the filament 1330 is on the distal surface of the first chamber 1312 (i.e., Fig.13A proximal side of the distal surface 1315).

[0069] refer to Fig. 13C , the filament 1330 is captured in Fig.13A and Fig. 13B When the first and second chambers 1312, 1313 are in the first and second chambers 1312, 1313, the joint 1300 can be translated proximally relative to the sleeve 1302. When the first and second chambers 1312, 1313 move beyond each other, the filament 1330 is subjected to shear forces between the distal peripheral outer edge 1316 of the first chamber 1312 and the proximal inner edge 1318 of the periphery of the second chamber 1313.

[0070] refer to Fig.13D ,when FIG. 13A to FIG. 13C When the first and second chambers 1312, 1313 of the filament 1330 move beyond each other, the filament 1330 is cut. The cut portion 1331 of the filament 1330 can remain in the cavity 1304, be withdrawn proximally through the cavity 1304, be discharged distally through the cavity 1304, or be discharged radially from the second cavity 1313 in general.

[0071] In various embodiments, the chamber of the coupling body and / or the liner may include various shapes, surfaces and / or edges for engaging, accepting, capturing, moving, sliding, stopping, guiding, shearing and / or holding a portion of a filament or filament. The shapes of the chambers depicted and described with respect to one or more specific embodiments and / or the combination of various parts on the surface may be used in other embodiments of the chambers described or otherwise within the scope of the present invention.

[0072] refer to Fig.14 , an embodiment of a coupling body 1400 and a sleeve 1402 is shown. As described herein, the coupling body 1400 can be coupled to an actuation line and the sleeve 1402 can be coupled to an outer sheath. The coupling body 1400 can slide within a cavity 1404 of the sleeve 1402. The sleeve 1402 includes a substantially radial chamber 1412 extending into the cavity 1404. The chamber 1412 includes a proximal surface 1414 and a distal surface 1415 that intersect at a mid-portion 1416 of the chamber 1412 curve. The coupling body 1400 includes a cutting edge 1401 located at the distal tip of the coupling body 1400 at the outer diameter of the coupling body 1400. The distal tip of the coupling body 1400 includes a surface 1403 having an angle extending from the longitudinal axis 1 of the coupling body 1400 to the cutting edge 1401. The surface 1403 extends proximally and inwardly from the cutting edge 1401 toward the longitudinal axis 1. The filament can be captured within the chamber 1412 and the engagement body 1400 can translate within the chamber 1402 toward the filament within the chamber 1412. A contact body 1408 is disposed within the distal end 1402d of the sleeve 1402, which prevents the engagement body 1400 from translating distally. The contact body 1408 can include a material that is soft enough so that the cutting edge 1401 is not damaged when contacting the contact body 1408, and has sufficient elasticity so that the cutting edge 1401 can extend distally beyond the filament at least partially into the contact body 1408 to ensure complete severance of the filament, for example, including materials such as urethane, high-density polyethylene, plasticized grade PVC, etc. The sleeve 1402 includes an atraumatic tip 1402t having a distally narrowing diameter, so that anatomical structures or other instruments may not be damaged when delivering the device and / or so that narrow paths can be more easily traversed compared to devices without the atraumatic tip 1402t.

[0073] refer to Fig.15, an embodiment of a coupling body 1500 and a sleeve 1502 is shown. As described herein, the coupling body 1500 can be coupled to an actuation line and the sleeve 1502 can be coupled to an outer sheath. The coupling body 1500 can slide in the cavity 1504 of the sleeve 1502. The sleeve 1502 includes a substantially radial chamber 1512 extending into the cavity 1504. The chamber 1512 includes a proximal surface 1514 and a distal surface 1515 intersecting at a middle portion 1516 bent in the cavity 1512. The coupling body 1500 includes a cutting portion 1501 at the distal tip of the coupling body 1500, which can be a cutting edge or a blunt surface. The cutting portion 1501 is a distal portion of the coupling body 1500 that tapers distally with a reduced width. The filament can be captured in the chamber 1512 and the coupling body 1500 can translate in the cavity 1504 toward the filament in the chamber 1512. The contact body 1508 is disposed within the distal end 1502d of the bushing 1502, which prevents the engagement body 1500 from translating distally. The contact body 1508 includes a tapered proximal portion 1509 that tapers proximally with a reduced width. In the event that the filament is captured within the chamber 1512, the engagement body 1500 can translate distally toward the contact body 1508, causing the filament to be compressed and / or sheared between the cutting portion 1501 and the proximal portion 1509, thereby severing the filament.

[0074] refer to FIG. 16A to FIG. 16C , an embodiment of a coupling body 1600 and a sleeve 1602 is shown. As described herein, the coupling body 1600 can be coupled to an actuation line and the sleeve 1602 can be coupled to an outer sheath. The coupling body 1600 can slide within a cavity 1604 of the sleeve 1602. The sleeve 1602 includes a substantially radial chamber 1612 extending into the cavity 1604. The chamber 1612 includes a proximal surface 1614 and a distal surface 1615 intersecting at a curved middle portion 1616 of the chamber 1612. The coupling body 1600 includes a cutting edge 1601 located at the distal tip of the coupling body 1600 at the outer diameter of the coupling body 1600. The distal tip of the coupling body 1600 includes a surface 1603 having an angle extending to the cutting edge 1601 through the longitudinal axis l of the coupling body 1600. The angled surface 1603 can be used to capture the filament, and the cutting edge 1601 around the angled surface 1603 can reduce the amount of shear stress required to sever the filament compared to a radial cross-sectional surface having a shorter perimeter around the surface. The filament 1630 can be captured within the chamber 1612 and the engaging body 1600 can be translated within the cavity 1604 toward the filament 1630 within the chamber 1612. When the cutting edge 1601 is translated distally beyond the chamber 1612, the cutting edge 1601 and the inner edge of the distal surface 1615 shear the filament 1630.

[0075] refer to Fig.17 , shows an embodiment of a filament cutting device, which includes a sleeve 1702 coupled to a distal end of an outer sheath 1708. The sleeve 1702 includes a substantially radial chamber 1712. The chamber 1712 includes a proximal surface 1714 and a distal surface 1715 that intersect at a curved middle portion 1716 of the chamber 1712. The cutter 1701 extends through the chamber 1712. The cutter 1701 extends substantially parallel to the longitudinal axis of the sleeve 1702, but can also be angled, such as parallel or perpendicular to the proximal surface 1714. The cutter 1701 includes an edge oriented substantially radially outward from the chamber 1712. The filament 1730 can be captured within the chamber 1712 and the sleeve 1702 can be translated proximally and / or distally against the filament 1730 so that the cutter 1701 cuts the filament 1730. The distance between the outer surface of the sleeve 1702 and the edge of the cutter within the chamber 1712 can be substantially equal to the diameter of the filament 1730, for example, approximately 0.25 mm, etc., so that the distal surface 1715 can be placed adjacent to the filament 1730 to manipulate the filament 1730 and / or serve as a stop against the filament 1730 for cutting. Fig.17 Embodiments of have no moving parts relative to each other, which can reduce stress on the outer sheath 1708 and / or filaments 1730 during operation.

[0076] refer to Fig.18 , an embodiment of a filament cutting device is shown, which includes a sleeve 1802 coupled to a distal end of an outer sheath 1808. The sleeve 1802 includes a chamber 1812. The chamber 1812 is defined substantially laterally through the distal top 1802t of the sleeve 1802 and includes a curved middle portion 1816 of the chamber 1812. The cutter 1801 extends through the chamber 1812. The cutter 1801 extends substantially laterally through the longitudinal axis of the sleeve 1802, but may also be angled. The cutter 1801 is an activatable line configured to melt the filament. The ends 1814, 1815 of the cutter 1801 extend into the sleeve 1802 and are coupled (e.g., welded) to a first lead 1851 and a second lead 1852, which extend proximally along the sleeve 1802 and the outer sheath 1808 to an energy source (e.g., a battery in a handle). Cutter 1801 and leads 1851, 1852 may be overmolded within sleeve 1802. Cutter 1801 has a conductive outer surface, while leads 1851, 1852 are insulated along leads 1851, 1852 by sleeve 1802 and / or an insulating cover. Fig.18 The embodiment of has no moving parts, which can reduce stress on the outer sheath 1808 and / or the filaments during operation. The cutter 1801 can include various conductive materials, such as nickel-chromium alloy, iron-chromium-aluminum alloy, etc.

[0077] refer to Fig.19, shows an embodiment of a tether device 1900, which includes an elastically stretchable body 1904 having a first end 1901 and a second end 1902. An elongated tubular hollow body alignment member 1908 may extend at least partially over the elastomeric body 1904. The alignment member 1908 may align and / or orient the device 1900 within a working channel of a scope, other introducer sheath, or catheter during manipulation of the device 1900. A clip 1910 is coupled to the first end 1901 of the elastomeric body 1904. A neck 1912 extends from the second end 1902 of the elastomeric body 1904 to a loop 1914. The clip 1910 may be manipulated by a medical professional so that the clip 1910 coupled to the first end 1901 of the tether device 1900 is delivered toward tissue. The clip 1910 may be coupled to tissue in addition to being coupled to the first end 1901 of the elastomeric body 1904. The loop 1914 may be engaged by another device, such as an additional clip. The additional clip can be moved to position the loop 1914 within the additional clip jaws and couple the additional clip to another anatomical structure or another portion of tissue so that the second end 1902 of the elastic member 1904 extends away from the first end 1901. In this position, the additional clip is attached to the anatomy of the structure or tissue. Fig.19 1900 is placed in greater axial tension than in the relaxed state of tether device 1900 shown. In various embodiments, clip 1910 can be rotated to rotate tether device 1900. Clip 1910 can be repositioned before, during, and / or after a procedure. Clip 1910 can be a single-use clip. With tether device 1900 and tissue coupled to tether device 1900 in tension, a medical procedure can be performed, such as excising tissue. During and / or after a procedure, the tether device 1900 can be cut by severing the tether device, such as elastomer 1904, alignment member 1908, neck 1912, and / or loop 1914 (see, e.g., FIG. 5A to FIG. 5D and FIG. 10A to FIG. 10D ) to release tension. In various embodiments, the elastomer 1904 can be cut by a cutting device. In various embodiments, the elastomer 1904 can include one or more fixing bodies located at one or more ends 1901, 1902 of the elastomer 1904, which can each be coupled to the filament. The elastomer 1904 can include an internal filament that can prevent the elastomer 1904 from stretching beyond a desired length. The filaments of the elastomer 1904 can include, extend to, or be coupled to one or more rings (e.g., ring 1914 with or without neck 1912) that can have various shapes and diameters.

[0078] refer to Fig. 20, an embodiment of a tether device is shown being delivered and applying tension between a target tissue 2004 and another tissue 2038. An elastic body 2014 is coupled to a first clip 2012 at a first end of the elastic body 2014. The first clip 2012 is coupled to the target tissue 2004 for resection. A second end of the elastic body 2014 is coupled to a second clip 2011. The second clip 2011 is coupled to the tissue 2038 such that the elastic body 2014 is in tension. A resection tool 2020 is delivered toward the target tissue 2004 via the endoscope 2006. When the target tissue 2004 is resected, the elastic body 2014 substantially pulls the first clip 2012 and the target tissue 2004 toward the second clip 2011 such that visualization is maintained between the endoscope 2006, the tool 2020, and the target tissue 2004. During or at the end of a procedure, an embodiment of a filament cutting device may be delivered to the elastic body 2014 to cut the elastic body 2014, thereby releasing the tension in the elastic body 2014. A tether device and clip delivery device or other delivery device for a tether device, such as Fig.19 Various embodiments of the tether device and clip delivery device can be used in tissue removal procedures, such as Fig. 20 Depicted during surgery.

[0079] An embodiment of a method for cutting filaments can include inserting a device having an outer sheath into a patient. The engaging body and / or sleeve of the device can be manipulated toward the filaments. The filaments can be captured in one or more chambers of the device. The engaging body and / or sleeve can be translated axially along the device to cut the filaments.

[0080] According to the present invention, all devices and / or methods disclosed and claimed herein can be made and performed without undue experimentation. Although the devices and methods of the present invention have been described in preferred embodiments, it is obvious to those skilled in the art that changes can be applied to the devices and / or methods and the steps of the methods described herein or in the sequence of steps without departing from the concept, spirit and scope of the present invention. All such similar substitutions and modifications obvious to those skilled in the art are considered to be within the spirit, scope and concept of the present invention as defined by the appended claims.

Claims

1. A filament cutting device, comprising: Outer sheath; a hub coupled to a distal end of the outer sheath, the hub defining a chamber along a length of the hub, the hub being configured to capture a portion of the filament within the chamber; an actuation wire slidably extendable within said outer sheath and said bushing; as well as an engagement body coupled to a distal end of the actuation wire, the engagement body including a cutting edge at a distal tip of the engagement body; as well as Wherein with the filament captured within the chamber, movement of the actuation wire and engagement body causes the cutting edge to sever the filament.

2. The filament cutting device of claim 1, wherein the cutting edge is an outer diameter of the engagement body.

3. The filament cutting device of claim 2, wherein the distal tip of the engagement body comprises a surface having an angle extending from a longitudinal axis of the engagement body to the cutting edge. 4 . The filament cutting device according to claim 1 , further comprising a contact body disposed within the distal end of the bushing, the contact body being configured to prevent the engagement body from translating distally.

5. The filament cutting device of claim 4, wherein the contact body comprises a tapered proximal portion that tapers proximally with a decreasing width.

6. The filament cutting device according to any one of claims 1-3, wherein the engagement body comprises a tapered distal portion that tapers distally with a decreasing width.

7. A filament cutting device comprising: Outer sheath; a hub coupled to a distal end of the outer sheath, the hub including a chamber; and A cutter extends across the chamber and is configured to sever the filament.

8. The filament cutting device according to claim 7, wherein: The chamber is defined along a length of the bushing, and the bushing is configured to capture a portion of the filament within the chamber.

9. The filament cutting device according to claim 8, wherein: The cutter is a blade having an edge extending substantially parallel to a longitudinal axis of the filament cutting device.

10. The filament cutting device according to claim 7, wherein: The chamber is defined transversely through the distal tip of the hub.

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