Medical snare device

Abstract

This medical snare device comprises: an inner shaft having a tubular shape that is long in the longitudinal direction, and including a first lumen formed therein in the longitudinal direction and a second lumen formed in parallel with the first lumen in the longitudinal direction; and a wire forming a looped snare at the distal side of the inner shaft, and extending from the snare and disposed in the longitudinal direction to be movable along the first lumen and the second lumen of the inner shaft. The loop of the snare is released by pulling and moving one of the wire portions protruding from the proximal openings of the first lumen and second lumen. accordingly, the snare hooked on a target object can be easily released without moving the inner shaft.

Description

Medical snare device

[0001] The present invention relates to a medical snare device. More specifically, it relates to a medical snare device that can easily release a snare from an object.

[0002] Medical snare devices are typically used in endoscopic procedures. They consist of a rod-shaped shaft and a ring-shaped snare formed at the tip of the shaft. The practitioner uses the snare device to approach an abnormal tissue, such as a polyp, within the body, then either secure it by hanging it on the outside of the abnormal tissue or pull it out to remove it.

[0003] In addition to the above-mentioned uses, medical snare devices are also used to appropriately position coil anchors provided at the ends of catheters positioned in blood vessels, etc. For example, a practitioner can adjust the position of the coil anchor by hooking the snare of the medical snare device to the proximal end of the coil anchor and pushing the coil anchor distally or pulling it proximally. In this case, after adjusting the position of the coil anchor, the practitioner needs to release the snare from the proximal end of the coil anchor and remove it.

[0004] In this way, the medical snare device needs to have a function of fixing the ring-shaped snare to an object (hereinafter referred to as “object”) such as a polyp, an abnormal tissue, or a coil anchor of a catheter, or releasing the snare from the object.

[0005] Fig. 1 is a drawing showing a conventional medical snare device. The conventional medical snare device (10) illustrated in Fig. 1 is composed of a ring-shaped snare (20) and a tube-shaped shaft (30) provided at an end of the snare (20) to support the snare (20) and bring it close to a coil anchor (hereinafter also referred to as an "object") (1000).

[0006] The operator can adjust the position of the object (1000) within the blood vessel (40) by moving the shaft (30) in the longitudinal direction while fixing the snare (20) of the conventional medical snare device to the end of the object (1000) provided on the catheter.

[0007] In a conventional medical snare device, once the position adjustment for the object (1000) is completed, the snare (20) needs to be removed from the object (1000). However, when the snare (20) is moved in the direction A in Fig. 1, the snare (20) is easily released from the object (1000), but when the snare (20) is moved in the direction B, which is the opposite direction to the direction A, it is difficult for the snare (20) to be removed from the object (1000), and thus the snare cannot be easily released, which is a problem.

[0008] In addition, in the conventional medical snare device (10), since the ring-shaped snare (20) is integrally provided with the shaft (30), the shaft (30) must be moved in order to move the snare (20). In the case where the shaft (30) is positioned in a blood vessel or the like, the range in which the shaft (30) can move is narrow, so there is a problem in that it is more difficult to release the snare (20) from the object (1000).

[0009] The present invention is intended to solve the problems of conventional medical snare devices, and aims to provide a medical snare device that can easily release the snare from an object.

[0010] In order to achieve the above object, the present invention is a medical snare device, comprising: an inner shaft having a longitudinally elongated tube shape, a first lumen formed therein along the longitudinal direction, and a second lumen formed along the longitudinal direction parallel to the first lumen; a ring-shaped snare formed on a distal side of the inner shaft; and a wire extending from the snare and arranged to be movable along the longitudinal direction in the first lumen and the second lumen of the inner shaft; wherein the ring shape of the snare is released by pulling and moving one of a wire portion protruding from a proximal opening of the first lumen and a wire portion protruding from a proximal opening of the second lumen toward the proximal side.

[0011] The present invention, having such a configuration, can release the snare from an object by pulling one of the wire portions protruding from the proximal opening of the first lumen and the wire portions protruding from the proximal opening of the second lumen proximally to release the snare's ring shape. Therefore, the present invention can easily release the snare from an object without moving the snare as in the prior art.

[0012] In addition, the present invention further comprises a protective tube provided on the distal side of one of the first lumen and the second lumen and wrapping the snare in the wire.

[0013] The present invention having such a configuration can prevent damage to the object caused by the wire because the protective tube is interposed between the object and the wire (more specifically, the snare).

[0014] Additionally, the protective tube of the present invention is detachably connected to the distal side of one of the first lumen and the second lumen.

[0015] The present invention having such a configuration is easy to manufacture because the protective tube is detachably connected to the distal side of one of the first lumen and the second lumen, and also allows the protective tube to be easily removed during a procedure that does not require the protective tube.

[0016] In addition, the protective tube of the present invention is formed to extend integrally from the distal side of one of the first lumen and the second lumen.

[0017] The present invention having this configuration allows stable treatment to be performed because the protective tube is formed to extend continuously from the distal side of one of the first lumen and the second lumen, so that even if the wire moves within the protective tube, the protective tube does not become separated.

[0018] In addition, the present invention further includes a wire manipulation handle provided on the proximal side of the inner shaft, which locks or unlocks relative movement of a wire portion protruding from the proximal opening of the first lumen and a wire portion protruding from the proximal opening of the second lumen.

[0019] The present invention having such a configuration can easily lock and unlock the relative movement of the wire portion protruding from the proximal opening of the first lumen and the wire portion protruding from the proximal opening of the second lumen.

[0020] In addition, in the present invention, the wire manipulation handle has a body part to which the proximal end of the inner shaft is fixed, and a wire extraction knob detachably mounted on the body part, one of a wire part protruding from the proximal opening of the first lumen and a wire part protruding from the proximal opening of the second lumen being fixed.

[0021] The present invention having this configuration allows the operator to more easily pull out the wire toward the proximal side of the inner shaft using the wire extraction knob.

[0022] In addition, the present invention further comprises an outer shaft having a guide lumen formed in the longitudinal direction through which the inner shaft passes, guiding movement of the inner shaft along the longitudinal direction within the guide lumen, and a shaft operating handle for locking or unlocking relative movement of the inner shaft with respect to the outer shaft.

[0023] The present invention having this configuration can easily lock and unlock the relative movement of the inner shaft with respect to the outer shaft.

[0024] The medical snare device of the present invention can easily release the snare from an object without moving the inner shaft.

[0025] Figure 1 is a drawing showing a conventional medical snare device.

[0026] FIG. 2 is a drawing showing a medical snare device according to the first embodiment of the present invention.

[0027] FIG. 3 is a drawing showing the inner shaft and wire of a medical snare device according to the first embodiment of the present invention.

[0028] FIG. 4 is a drawing showing a wire manipulation handle of a medical snare device according to the first embodiment of the present invention.

[0029] FIG. 5 is a drawing showing an outer shaft and a shaft operating handle of a medical snare device according to the first embodiment of the present invention.

[0030] Fig. 6 is a drawing showing a shaft operating handle of a medical snare device according to the first embodiment of the present invention.

[0031] Figure 7 is a drawing showing a medical snare device of a second embodiment of the present invention.

[0032] Fig. 8 is a drawing explaining the snare's catching operation in a medical snare device according to the second embodiment of the present invention.

[0033] FIG. 9 is a drawing explaining a release operation for releasing the snare in a medical snare device according to the second embodiment of the present invention.

[0034] Fig. 10 is a drawing showing a medical snare device according to a third embodiment of the present invention.

[0035] Fig. 11 is a cross-sectional view showing a handler in a medical snare device according to a third embodiment of the present invention.

[0036] Fig. 12 is a drawing explaining the snare's catching operation in a medical snare device according to the third embodiment of the present invention.

[0037] FIG. 13 is a drawing explaining a release operation for releasing the snare in a medical snare device according to a third embodiment of the present invention.

[0038] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. The drawings may be drawn differently from the actual size and ratio for ease of understanding. In addition, for convenience of explanation, the same reference numerals are assigned to the same components and redundant descriptions are omitted. Hereinafter, “proximal” indicates a close location with respect to the operator, and “distal” indicates a far location. In addition, the direction in which the inner shaft, outer shaft, and wire described below extend, that is, the direction from the distal side to the proximal side or the direction from the proximal side to the distal side, is referred to as the “longitudinal direction.”

[0039] < First embodiment >

[0040] FIGS. 2 to 6 are drawings showing a medical snare device (100) according to a first embodiment of the present invention. Referring to FIGS. 2 to 6, the medical snare device (100) according to the first embodiment includes an inner shaft (200), a wire (300) forming a snare (310), and an outer shaft (400).

[0041] The inner shaft (200) has a tubular shape extending longitudinally, as illustrated in FIGS. 2 and 3. Since the inner shaft (200) must travel along blood vessels within the body, it is manufactured to be able to bend in accordance with the shape of the blood vessels. For example, it is made of a polymer that has flexibility and elasticity along with a certain rigidity.

[0042] In addition, a first lumen (210) and a second lumen (220) are formed inside the inner shaft (200) along the longitudinal direction. The first lumen (210) and the second lumen (220) are opened at the proximal end and the distal end of the inner shaft (200). The first lumen (210) and the second lumen (220) are formed parallel to each other along the longitudinal direction. The first lumen (210) and the second lumen (220), like the inner shaft (200) surrounding them, are manufactured to be able to bend in accordance with the shape of the blood vessel.

[0043] The wire (300) is arranged in the first lumen (210) and the second lumen (220) along the longitudinal direction. The wire (300) also forms a ring-shaped snare (310) at the distal end of the inner shaft (200). The wire (300) is formed as a single member having a thin and long shape and is made of nitinol or the like.

[0044] As illustrated in the enlarged cross-sectional view AA of Fig. 3 (a), a plurality of lumens may be formed in the inner shaft (200). Among these multiple lumens, two lumens in which the wire (300) is placed are referred to as the first lumen (210) and the second lumen (220). Lumens (240) other than the first lumen (210) and the second lumen (220) may be used for other purposes. For example, the operator may inject contrast media, etc., through other lumens (240).

[0045] The wire (300) is arranged to pass through the first lumen (210) and extends from the proximal opening (210a) of the first lumen (210) and the distal opening (210b) of the first lumen (210). In addition, the wire (300) is arranged to pass through the second lumen (220) and extends from the proximal opening (220a) of the second lumen (220) and the distal opening (220b) of the second lumen (220). In addition, the wire (300) is formed such that the portion extending from the distal opening (210b) of the first lumen (210) and the portion extending from the distal opening (220b) of the second lumen (220) are continuously connected to form a ring-shaped snare (310).

[0046] Additionally, the wire (300) is arranged to be movable along the longitudinal direction within the first lumen (210) and the second lumen (220). That is, the wire (300) is not fixed to the first lumen (210) and the second lumen (220).

[0047] As described above, the wire (300) is arranged to be movable in the longitudinal direction within the first lumen (210) and the second lumen (220) while forming a ring-shaped snare (310) on the distal side of the inner shaft (200). The ring-shaped snare (310) of the wire (300) formed on the distal side of the inner shaft (200) is caught on the object (1000). In this state, if the portion of the wire (300) protruding from the proximal opening (210a) of the first lumen (210) and the portion of the wire (300) protruding from the proximal opening (220a) of the second lumen (220) are pulled together proximally or pushed together distally, the size of the ring of the snare (310) can be adjusted. In this way, by adjusting the size of the ring of the snare (310), the degree of engagement (or fixation) of the snare (310) with respect to the object (1000) can be adjusted (see (b) and (c) of FIG. 8).

[0048] In addition, when the wire (300) forms a ring-shaped snare (310) on the distal side of the inner shaft (200) and is arranged so as to be movable in the longitudinal direction within the first lumen (210) and the second lumen (220), and one of the wire (300) portion protruding from the proximal opening (210a) of the first lumen (210) and the wire (300) portion protruding from the proximal opening (220a) of the second lumen (220) is pulled proximally, the wire (300) is pulled proximally from the inner shaft (200). At this time, the ring-shaped snare (310) formed on the distal side of the inner shaft (200) is released and disappears. As a result, the snare on the object (1000) is released (see (b) of FIG. 9).

[0049] In this way, in the medical snare device (100) of the present embodiment, the wire (300) forms a ring-shaped snare (310) on the distal side of the inner shaft (200) and is arranged so as to be movable along the longitudinal direction within the first lumen (210) and the second lumen (220), so that, unlike conventional medical snare devices, the snare is not moved to release the snare from the object, but rather, one of the portion of the wire (300) protruding from the proximal opening (210a) of the first lumen (210) and the portion of the wire (300) protruding from the proximal opening (220a) of the second lumen (220) is pulled proximally to release the snare from the object (1000).

[0050] In addition, the medical snare device (100) of the present embodiment is placed outside the body as illustrated in FIG. 2, and is equipped with a handler (500) for the operator to manipulate the inner shaft (200) and the wire (300). The handler (500) is equipped with a wire manipulation handle (510) for manipulating the wire (300) and a shaft manipulation handle (520) for manipulating the inner shaft (200).

[0051] Specifically, the wire manipulation handle (510) locks or unlocks the relative movement of a portion of the wire (300) extending from the proximal opening (210a) of the first lumen (210) on the proximal side of the inner shaft (200) and a portion of the wire (300) extending from the proximal opening (220a) of the second lumen (220).

[0052] As illustrated in FIG. 4, the wire manipulation handle (510) has a body portion (511) through which a wire (300) (specifically, a portion of the wire (300) extending from the proximal opening (210a) of the first lumen (210) and a portion of the wire (300) extending from the proximal opening (220a) of the second lumen (220)) passes, and a wire locking knob (512) that is screw-coupled to the body portion (511) and rotates to move along the longitudinal direction of the body portion (511). In addition, a fixing member (513) is provided inside the body portion (511) so that the opening through which the wire (300) passes is contracted by the longitudinal movement of the wire locking knob (512).

[0053] For the wire operation handle (510) having this configuration, when the wire locking knob (512) is rotated in the locking direction, the opening of the fixture (513) narrows, and as a result, the portion of the wire (300) protruding from the proximal opening (210a) of the first lumen (210) of the wire (300) and the portion of the wire (300) protruding from the proximal opening (220a) of the second lumen (220) come into close contact, and their relative movement is locked. Conversely, when the wire locking knob (512) is rotated in the opposite direction to the locking direction (releasing direction), the opening of the fixture (513) is widened, and as a result, the portion of the wire (300) protruding from the proximal opening (210a) of the first lumen (210) and the portion of the wire (300) protruding from the proximal opening (220a) of the second lumen (220) are released from contact, and the unlocked state is entered where they can move relative to each other.

[0054] In addition, when the wire locking knob (512) of the wire manipulation handle (510) is rotated in the locking direction so that the relative movement of the portion of the wire (300) protruding from the proximal opening (210a) of the first lumen (210) and the portion of the wire (300) protruding from the proximal opening (220a) of the second lumen (220) is locked, when the wire manipulation handle (510) is pulled proximally or pushed distally, the portion of the wire (300) protruding from the proximal opening (210a) of the first lumen (210) and the portion of the wire (300) protruding from the proximal opening (220a) of the second lumen (220) move simultaneously, and as a result, the size of the ring of the snare (310) formed on the distal side of the inner shaft (200) can be adjusted as described above. As a result, the degree of engagement (or fixation) of the snare (310) with respect to the object (1000) can be adjusted.

[0055] In addition, by rotating the wire locking knob (512) of the wire operating handle (510) in the direction opposite to the locking direction to release the lock on the relative movement of the portion of the wire (300) protruding from the proximal opening (210a) of the first lumen (210) and the portion of the wire (300) protruding from the proximal opening (220a) of the second lumen (220), the operator can easily release the snare (310) from its hook-up on the object (1000) by pulling out one of the portions of the wire (300) protruding from the proximal opening (210a) of the first lumen (210) and the portions of the wire (300) protruding from the proximal opening (220a) of the second lumen (220) proximally, as described above.

[0056] The wire manipulation handle (510) of the present embodiment has the same configuration as described above, but may have a different configuration as long as the relative movement of the wire (300) portion protruding from the proximal opening (210a) of the first lumen (210) and the wire (300) portion protruding from the proximal opening (220a) of the second lumen (220) can be locked or unlocked by the manipulation of the operator.

[0057] The shaft operating handle (520) is provided on the distal side of the wire operating handle (510), as illustrated in FIGS. 2, 5, and 6, and has a guide lumen (521) formed therein along the longitudinal direction. The guide lumen (521) of the shaft operating handle (520) has an open proximal end, and the distal end is continuous with the guide lumen (410) of the outer shaft (400).

[0058] The outer shaft (400) extends from the distal end of the shaft operating handle (520). Like the inner shaft (200), the outer shaft (400) is designed to be flexible because it must travel along blood vessels within the body. For example, it is made of a polymer that has flexibility and elasticity along with a certain level of rigidity.

[0059] The inner shaft (200) is inserted into the guide lumen (521) of the shaft operating handle (520) and the guide lumen (410) of the outer shaft (400), and is guided along the guide lumen (521, 410) to move to a position close to the object (1000). Therefore, the outer shaft (400) has a length that allows it to approach the object (1000) inside the body from outside the body.

[0060] In addition, the shaft operation handle (520) is provided with a shaft locking knob (522) for locking the inner shaft (200) so that it does not move relative to the outer shaft (400). The shaft locking knob (522) is screw-coupled to the proximal end of the shaft operation handle (520) and can be moved by rotation, as illustrated in FIG. 6. An elastic body (523) is provided inside the shaft operation handle (520), and the inner shaft (200) passes through a through hole formed inside the elastic body (523).

[0061] When the shaft locking knob (522) is rotated in the locking direction, the shaft locking knob (522) moves toward the elastic body (523) to pressurize the elastic body (523), thereby tightening the elastic body (523) radially inward. As a result, the inner shaft (200) is locked so as not to move relative to the shaft operating handle (520) (and the outer shaft (400)) by tightening the elastic body (523). When the shaft locking knob (522) is rotated in the opposite direction to the locking direction, the tightening of the elastic body (523) is released, thereby unlocking the inner shaft (200) relative to the outer shaft (400).

[0062] The shaft locking knob (522) of the present embodiment has the same configuration as described above, but may have a different configuration if it locks or unlocks the relative movement of the inner shaft (200) with respect to the outer shaft (400) by manipulation by the operator.

[0063] As described above, the medical snare device (100) of the first embodiment can release the snare (310) from the object (1000) by pulling one of the wire (300) portion protruding from the proximal opening (210a) of the first lumen (210) and the wire (300) portion protruding from the proximal opening (220a) of the second lumen (220) proximally to release the loop shape of the snare (310). That is, the medical snare device (100) of the first embodiment can easily release the snare (310) from the object (1000) without moving the snare as in the prior art.

[0064] < Second embodiment >

[0065] Figures 7 to 9 are drawings showing a medical snare device (100') of a second embodiment of the present invention. For convenience of explanation, the following mainly describes the configurations that are different from the medical snare device (100) of the first embodiment, and the same drawing reference numerals are used for the same configurations, and redundant descriptions are omitted.

[0066] The medical snare device (100') of the second embodiment of the present invention differs from the medical snare device (100) of the first embodiment in that a protective tube (230) is provided that extends a predetermined length from the distal side of the first lumen (210), and all other configurations are the same.

[0067] As illustrated in (a) and (b) of FIG. 7, a wire (300) (more specifically, a wire constituting a snare (310)) is movably arranged within a protection tube (230). In this way, the protection tube (230) is interposed between the object (1000) and the snare (310) when the snare (310) is caught and fixed on the object (1000). In addition, the protection tube (230) has a length sufficient to surround the snare (310) when the snare (310) is caught and fixed on the object (1000). In the present embodiment, the length of the protection tube (230) is approximately 1 cm to 3 cm, and preferably 2 cm.

[0068] In addition, the protective tube (230) is made to be bendable. The protective tube (230) can be made of polytetrafluoroethylene (PTFE) or the like, and in the present embodiment, the protective tube (230) is made of Pellethane (trade name) or the like.

[0069] In this way, the protection tube (230) is interposed between the object (1000) and the snare (310), and serves to reduce friction that occurs between the wire (300) constituting the snare (310) and the object (1000). Since the wire (300) is thin, if it is tightened against the object (1000), it may cause damage to the object (1000). In addition, if it is pulled in one direction while being tightened against the object (1000), it may cause friction with the object (1000) while moving, causing damage.

[0070] In the medical snare device (100') of the present embodiment, the protective tube (230) is interposed between the object (1000) and the wire (more specifically, the snare (310)) to prevent damage to the object (1000) caused by tightening or movement of the wire (300).

[0071] In the medical snare device (100') of the present embodiment, the protective tube (230) may be formed to extend integrally from the distal side of the first lumen (210), or may be manufactured separately from the first lumen (210) and detachably connected thereto, as in (b) of FIG. 7. The protective tube (230) may be detachably connected to the distal side of the first lumen (210) by screwing. To this end, screw threads may be formed on the outer circumferential surface of the end portion (231) of the protective tube (230), and screw threads may also be formed on the inner circumferential surface of the end portion (211) of the first lumen (210).

[0072] When the protection tube (230) and the first lumen (210) are connected by a screw connection, the protection tube (230) is caught on the first lumen (210) by the screw thread, so that when the wire (300) moves inside the protection tube (230), the protection tube (230) is pulled due to the movement of the wire (300) so as not to fall out of the first lumen (210).

[0073] In this embodiment, the protection tube (230) and the first lumen (210) are described as being screw-connected, but it is acceptable to have another connection structure as long as it has a hooking connection structure in which the protection tube (230) is pulled due to movement of the wire (300) after the protection tube (230) and the first lumen (210) are connected and does not fall out from the first lumen (210).

[0074] When the protection tube (230) is formed to extend continuously from the distal side of the first lumen (210), stable treatment is possible because the protection tube (230) does not separate from the first lumen (210) even if the wire (300) moves within the protection tube (230). In addition, when the protection tube (230) is detachably connected to the first lumen (210), there is the advantage of ease of manufacture, and the advantage of being able to be easily removed during treatment when the protection tube (230) is not needed.

[0075] In the above description, the protection tube (230) is described as being provided on the distal side of the first lumen (210), but the protection tube (230) may also be provided on the distal side of the second lumen (220). That is, the protection tube (230) may be provided on the distal side of one of the first lumen (210) and the second lumen (220).

[0076] Hereinafter, with reference to FIGS. 8 and 9, the engaging and releasing operations of the snare (310) in the medical snare device (100') of the second embodiment of the present invention will be described. The description will be made on the assumption that the object (1000) is a coil anchor and a protective tube (230) is provided on the distal side of the first lumen (210).

[0077] First, the wire (300) is movably placed in the first lumen (210) and the second lumen (220) of the inner shaft (200), and a ring-shaped snare (310) is formed on the distal side of the inner shaft (200). In this state, the inner shaft (200) is moved along the guide lumen (410) of the outer shaft (400), and the snare (310) is caught on the object (1000) (Fig. 8 (a)). At this time, the wire (300) constituting the snare (310) passes through the protective tube (230). In this state, the wire locking knob (512) and the shaft locking knob (522) are unlocked.

[0078] In the state of (a) of Fig. 8, that is, in the state where the snare (310) is caught on the object (1000), when the inner shaft (200) and the wire (300) are pulled proximally, the size of the loop of the snare (310) becomes smaller ((b) of Fig. 8). In the state of (b) of Fig. 8, when the inner shaft (200) and the wire (300) are pulled further proximally, the snare (310) is tightened on the object (1000), and a catch state in which the snare (310) is caught on the object (1000) is created ((c) of Fig. 8). When the snare (310) is caught and fixed on the object (1000), the shaft locking knob (522) is rotated in the locking direction to fix the inner shaft (200) to the outer shaft (400), and the wire locking knob (512) of the wire operating handle (510) is rotated in the locking direction to tighten the portion of the wire (300) protruding from the proximal opening (210a) of the first lumen (210) among the wires (300) and the portion of the wire (300) protruding from the proximal opening (220a) of the second lumen (220) to each other, thereby locking their relative movements.

[0079] In the state of (c) of Fig. 8, the operator can move the position of the object (1000) (anchor coil) fixed to the snare (310) by moving the shaft operation handle (520) and the outer shaft (400) in the longitudinal direction. In this case, the wire (300) constituting the snare (310) contacts the object (1000) with the protective tube (230) in between, and thus does not cause damage to the object (1000).

[0080] Meanwhile, in the above description, while reducing the size of the ring of the snare (310) (while making it into the state of (b) and (c) of FIG. 8), the relative movement of the wire (300) portion protruding from the proximal opening (210a) of the first lumen (210) and the wire (300) portion protruding from the proximal opening (220a) of the second lumen (220) is not locked, but the relative movement may be locked by rotating the wire locking knob (512) of the wire operating handle (510) in the locking direction.

[0081] When the operator adjusts and moves the position of the object (1000) (anchor coil) to a desired position and then releases the snare (310) from its engagement with the object (1000), first, the shaft locking knob (522) is rotated in the opposite direction to the locking direction, thereby releasing the lock of the inner shaft (200) with respect to the outer shaft (400). Then, the inner shaft (200) is pushed toward the distal side of the outer shaft (400). This causes the loop of the snare (310) to become larger. Thereafter, the operator rotates the wire locking knob (512) of the wire manipulation handle (510) in the opposite direction to the locking direction to release the lock on the relative movement of the portion of the wire (300) that has protruded from the proximal opening (210a) of the first lumen (210) and the portion of the wire (300) that has protruded from the proximal opening (220a) of the second lumen (220) (Fig. 9 (a)).

[0082] Thereafter, in the state of (a) of FIG. 9, the operator pulls one of the wire (300) portions proximal to the first lumen (210) and the wire (300) portions proximal to the second lumen (220) to cause the wire (300) to come out proximally from the inner shaft (200). As a result, the loop shape of the snare (310) is released, and the snare (310) is released from the object (1000) ((b) of FIG. 9).

[0083] When the wire (300) moves in the state of (b) of Fig. 9, it may cause friction and damage to the object (1000), but the medical snare device (100') of the present embodiment does not cause damage to the object (1000) because the protective tube (230) is interposed between the object (1000) and the snare (310).

[0084] As described above, the medical snare device (100') of the second embodiment can release the snare (310) from the object (1000) by pulling one of the wire (300) portion protruding from the proximal opening (210a) of the first lumen (210) and the wire (300) portion protruding from the proximal opening (220a) of the second lumen (220) proximally to release the loop shape of the snare (310), similar to the medical snare device (100) of the first embodiment. That is, the medical snare device (100') of the second embodiment can easily release the snare (310) from the object (1000) without moving the snare as in the prior art.

[0085] In the medical snare device (100') of the second embodiment, a protective tube (230) is interposed between the object (1000) and the snare (310), so that the wire (300) does not damage the object (1000) while moving.

[0086] <Third Embodiment>

[0087] Hereinafter, a medical snare device (100") according to a third embodiment of the present invention will be described with reference to FIGS. 10 to 13. For convenience of explanation, the following mainly describes the configurations that are different from the medical snare device (100) of the first embodiment and the medical snare device (100') of the second embodiment, and the same reference numerals are assigned to the same configurations, and redundant descriptions are omitted.

[0088] The medical snare device (100") of the present embodiment has a difference in the configuration of the handler (600) for manipulating the inner shaft (200) and the wire (300) compared to the medical snare device (100) of the first embodiment and the medical snare device (100') of the second embodiment described above, and is the same as the medical snare device (100') of the second embodiment in other configurations.

[0089] Referring to (a) of FIG. 10, the handler (600) of the medical snare device (100") of the present embodiment is provided with a wire manipulation handle (610) and a shaft manipulation handle (620). As shown in (b) of FIG. 10, the wire manipulation handle (610) is provided to be movable in the longitudinal direction with respect to the shaft manipulation handle (620).

[0090] The handler (600) of the present embodiment differs from the handler (500) of the second embodiment in that the wire manipulation handle (610) is not separated from the shaft manipulation handle (620) but is movably mounted on the shaft manipulation handle (620).

[0091] Fig. 11 (a) is a drawing showing a cross-section of a handler (600) portion of the present embodiment, and Fig. 11 (b) is a drawing showing a cross-section of a handler (600) portion seen from below Fig. 11 (a). For convenience of explanation, Fig. 11 (b) omits the wire locking knob (614) and only shows the end portion (614a) of the wire locking knob (614).

[0092] As illustrated in FIGS. 10 and 11, the shaft operation handle (620) has a generally roughly cylindrical shape, and an outer shaft (400) is connected to the distal end. As illustrated in FIG. 11 (a), the shaft operation handle (620) has an accommodation space (621) formed therein for movably accommodating a wire operation handle (610). The accommodation space (621) is connected to the guide lumen (410) of the outer shaft (400) on the distal side and is open on the proximal side.

[0093] A shaft operating handle (620) is provided with a shaft locking knob (622). The shaft locking knob (622) is screw-connected to a point on the outside of the shaft operating handle (620). When the shaft locking knob (622) is rotated in the locking direction, its end (622a) moves radially inward of the shaft operating handle (620) (specifically, toward the receiving space (621)). As a result, the end (622a) of the shaft locking knob (622) presses the body (611) of the wire operating handle (610) accommodated in the receiving space (621) on the inside of the shaft operating handle (620) from one side. In addition, when the shaft locking knob (622) is rotated in the opposite direction to the locking direction, its end (622a) moves outward to release the pressurization of the wire operating handle (610).

[0094] The wire operating handle (610) has a body portion (611) that is accommodated in a receiving space (621) of a shaft operating handle (620). A through hole (612) that penetrates from the distal side to the proximal side is formed within the body portion (611). An inner shaft (200) is inserted into and fixed to the through hole (612) from the distal side of the body portion (611). A wire (300) passes through the inner shaft (200) and the through hole (612).

[0095] A concave groove (613) is formed in the body (611) of the wire operating handle (610). An end (622a) of the shaft locking knob (622) described above is positioned in this concave groove (613). Specifically, in the present embodiment, a nut (613a) is positioned in the concave groove (613) so as to be movable in the longitudinal direction along the concave groove (613), and an end (622a) of the shaft locking knob (622) is screw-connected to this nut (613a).

[0096] As described above, when the shaft locking knob (622) is rotated in the locking direction, the end portion (622a) moves inwardly of the shaft operating handle (620) as described above, thereby pressurizing the body portion (611) accommodated in the accommodation space (621) of the shaft operating handle (620) from one side. As a result, the body portion (611) of the wire operating handle (610) is brought into close contact with the shaft operating handle (620) from the other side, so that the wire operating handle (610) is locked with respect to the shaft operating handle (620) and does not move along the longitudinal direction.

[0097] Conversely, when the shaft locking knob (622) is rotated in the opposite direction to the locking direction, the end portion (622a) moves to the outside of the shaft operating handle (620), thereby releasing the pressure on one side of the body portion (611) accommodated in the accommodation space (621) of the shaft operating handle (620). As a result, the contact between the body portion (611) and the shaft operating handle (620) on the other side is released, and the wire operating handle (610) becomes capable of moving longitudinally with respect to the shaft operating handle (620).

[0098] Meanwhile, since the end (622a) of the shaft locking knob (622) and the screw-connected nut (613a) are positioned within the concave groove (613), the wire operating handle (610) can move longitudinally within the range in which the nut (613a) can move within the concave groove (613) with respect to the shaft operating handle (620). That is, the concave groove (613) of the body portion (611) limits the range of movement of the wire operating handle (610) in the longitudinal direction.

[0099] In addition, a wire locking knob (614) is screw-connected to the proximal side of the body portion (611) in the wire operating handle (610). When the wire locking knob (614) is rotated in the locking direction, its end (614a) is pushed against the wall side of the body portion (611) facing the wire (300). As a result, the portion of the wire (300) protruding from the proximal opening (210a) of the first lumen (210) of the wire (300) and the portion of the wire (300) protruding from the proximal opening (220a) of the second lumen (220) are brought into close contact with the body portion (611), and their relative movement is locked.

[0100] In addition, the wire locking knob (614) is rotated in the opposite direction to the locking direction so that its end (614a) is separated from the wire (300). As a result, the portion of the wire (300) protruding from the proximal opening (210a) of the first lumen (210) and the portion of the wire (300) protruding from the proximal opening (220a) of the second lumen (220) do not come into close contact with the body (611). As a result, the portion of the wire (300) protruding from the proximal opening (210a) of the first lumen (210) and the portion of the wire (300) protruding from the proximal opening (220a) of the second lumen (220) can move relative to each other.

[0101] In addition, a wire extraction knob (630) is detachably mounted on the proximal side of the wire manipulation handle (610). To this end, a protruding portion (615) protruding proximally is provided on the proximal end of the wire manipulation handle (610), and a concave portion (631) that slides into and fits into the protruding portion (615) is provided on the wire extraction knob (630).

[0102] A wire passage hole (632) is formed in the wire extraction knob (630) that penetrates from the distal side to the proximal side. Only one of the wire (300) portions that extend from the proximal opening (210a) of the first lumen (210) and the wire (300) portions that extend from the proximal opening (220a) of the second lumen (220) passes through the wire passage hole (632).

[0103] Among the wire (300) portions protruding from the proximal opening (210a) of the first lumen (210) and the wire (300) portions protruding from the proximal opening (220a) of the second lumen (220), the other wire (300) is fixed to the wire extraction knob (630). Specifically, the other wire (300) portion can be fixed by being inserted into a hole formed in the wire extraction knob (630) and a fixing screw being screwed into the hole. The other wire (300) portion may also be fixed to the wire extraction knob (630) by any other appropriate method, such as welding.

[0104] Since the wire extraction knob (630) is fixed to the wire (300) of the other side, when the operator pulls the wire extraction knob (630) out from the wire manipulation handle (610) and pulls it toward the proximal side, the wire (300) of the other side is pulled together. That is, unlike the medical snare devices (100, 100') of the first and second embodiments, the medical snare device (100") of the present embodiment has a wire extraction knob (630), and is used when one of the wire (300) portion protruding from the proximal opening (210a) of the first lumen (210) and the wire (300) portion protruding from the proximal opening (220a) of the second lumen (220) is pulled out toward the proximal side of the inner shaft (200), so that the pulling out can be done more easily.

[0105] Hereinafter, with reference to FIGS. 12 and 13, the engaging and releasing operations of the snare (310) in the medical snare device (100") of the third embodiment of the present invention will be described. The description will be made on the assumption that the object (1000) is a coil anchor and a protective tube (230) is provided on the distal side of the first lumen (210).

[0106] First, the wire (300) is movably placed in the first lumen (210) and the second lumen (220) of the inner shaft (200), and a ring-shaped snare (310) is formed on the distal side of the inner shaft (200). In this state, the inner shaft (200) is moved along the guide lumen (410) of the outer shaft (400), and the snare (310) is caught on the object (1000) (Fig. 12 (a)). At this time, the wire (300) constituting the snare (310) passes through the protective tube (230). In addition, the wire locking knob (614) and the shaft locking knob (622) are in an unlocked state. The wire locking knob (614) may be in a locked state.

[0107] In the state of (a) of Fig. 13, that is, in the state where the snare (310) is caught on the object (1000), the wire locking knob (614) is rotated in the locking direction to be locked, and then when the wire locking handle (610) is pulled proximally, both the inner shaft (200) and the wire (300) move proximally, thereby reducing the size of the loop of the snare (310) ((b) of Fig. 13). In the state of (b) of Fig. 13, when the wire locking handle (610) is pulled further proximally, both the inner shaft (200) and the wire (300) move further proximally, thereby tightening the snare (310) on the object (1000), and entering a caught state where the snare (310) is caught on the object (1000). When the snare (310) is caught and fixed on the object (1000), the shaft locking knob (622) is rotated in the locking direction to fix the inner shaft (200) to the outer shaft (400) (Fig. 13 (c)).

[0108] In the state of (c) of Fig. 13, the operator can move the position of the object (1000) (anchor coil) fixed to the snare (310) by moving the shaft operation handle (620) and the outer shaft (400). In this case, the wire (300) constituting the snare (310) contacts the object (1000) with the protective tube (230) in between, and thus does not cause damage to the object (1000).

[0109] When the operator adjusts and moves the position of the object (1000) (anchor coil) to a desired position and then releases the snare (310) from its engagement with the object (1000), first, the shaft locking knob (622) is rotated in the opposite direction to the locking direction, thereby releasing the lock on the outer shaft (400) of the inner shaft (200). Then, the wire manipulation handle (610) is pushed toward the distal side of the outer shaft (400). This causes the loop of the snare (310) to become larger. Thereafter, the operator rotates the wire locking knob (614) of the wire manipulation handle (610) in the opposite direction to the locking direction to release the lock on the relative movement of the portion of the wire (300) protruding from the proximal opening (210a) of the first lumen (210) and the portion of the wire (300) protruding from the proximal opening (220a) of the second lumen (220) (Fig. 13 (a)).

[0110] Thereafter, in the state of (a) of FIG. 13, the operator pulls the wire extraction knob (630) out from the wire manipulation handle (610) and pulls it proximally. As a result, the wire (300) fixed to the wire extraction knob (630) together with the wire extraction knob (630) (one of the wire (300) portion protruding from the proximal opening (210a) of the first lumen (210) and the wire (300) portion protruding from the proximal opening (220a) of the second lumen (220)) is pulled out from the proximal side of the inner shaft (200). As a result, the loop shape of the snare (310) is released, and the snare (310) is released from the object (1000) ((b) of FIG. 13).

[0111] As described above, the medical snare device (100") of the third embodiment, like the medical snare devices (100, 100') of the first and second embodiments, can release the snare (310) from the object (1000) by pulling one of the wire (300) portion protruding from the proximal opening (210a) of the first lumen (210) and the wire (300) portion protruding from the proximal opening (220a) of the second lumen (220) proximally to release the loop shape of the snare (310). That is, the medical snare device (100") of the third embodiment can easily release the snare (310) from the object (1000) without moving the snare as in the prior art.

[0112] In addition, in the medical snare device (100") of the third embodiment, a wire extraction knob (630) is provided to which one of the wire (300) portion protruding from the proximal opening (210a) of the first lumen (210) and the wire (300) portion protruding from the proximal opening (220a) of the second lumen (220) is fixed, so that the operator can more easily pull out the wire to the proximal side of the inner shaft (200).

[0113] The embodiments of the present invention described above are merely examples that embody the technical idea of ​​the present invention, and the present invention is not limited to the embodiments described above and may be modified in various ways within the scope of the technical idea described in the claims.

[0114] [Explanation of symbols]

[0115] 100, 100', 100": Medical snare device

[0116] 200: Inner shaft 210: 1st lumen

[0117] 210a: Proximal opening of the first lumen 210b: Distal opening of the first lumen

[0118] 220: Second lumen 220a: Proximal opening of the second lumen

[0119] 220b: Distal opening of the second lumen 230: Protective tube

[0120] 300: Wire 310: Snare

[0121] 400: Outer shaft 410: Guide lumen

[0122] 500, 600: Handler 510, 610: Wire manipulation handle

[0123] 511, 611: Body 512, 614: Wire locking knob

[0124] 513: Fixture 520, 620: Shaft operating handle

[0125] 521: Guide lumen 522, 622: Shaft locking knob

[0126] 523: Elastic body 630: Wire extraction knob

[0127] 1000: Object

Claims

1. An inner shaft having a long tube shape in the longitudinal direction, a first lumen formed along the longitudinal direction therein, and a second lumen formed along the longitudinal direction parallel to the first lumen; A ring-shaped snare is formed on the distal side of the inner shaft, and a wire extending from the snare and arranged to be movable along the longitudinal direction in the first lumen and the second lumen of the inner shaft is included. A medical snare device characterized in that the loop shape of the snare is released by pulling and moving one of the wire portions protruding from the proximal opening of the first lumen and the wire portions protruding from the proximal opening of the second lumen toward the proximal side.

2. In claim 1, A medical snare device characterized in that it further comprises a protective tube that is provided on the distal side of one of the first lumen and the second lumen and wraps the snare around the wire.

3. In claim 2, A medical snare device, characterized in that the protective tube is detachably connected to the distal side of one of the first lumen and the second lumen.

4. In claim 2, A medical snare device characterized in that the protective tube is formed to extend integrally from the distal side of one of the first lumen and the second lumen.

5. In any one of claims 1 to 4, A medical snare device characterized in that it further comprises a wire manipulation handle provided on the proximal side of the inner shaft and locking or unlocking relative movement of a wire portion protruding from the proximal opening of the first lumen and a wire portion protruding from the proximal opening of the second lumen.

6. In claim 5, The above wire manipulation handle is, A body part to which the proximal end of the inner shaft is fixed, A medical snare device characterized by having a wire extraction knob detachably mounted on the body portion, and having one of a wire portion protruding from the proximal opening of the first lumen and a wire portion protruding from the proximal opening of the second lumen fixed thereto.

7. In claim 5, An outer shaft having a guide lumen formed longitudinally through which the inner shaft passes, and guiding movement of the inner shaft along the longitudinal direction within the guide lumen; A medical snare device further characterized by comprising a shaft manipulation handle for locking or unlocking relative movement of the inner shaft with respect to the outer shaft.

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