Medical devices
The medical device with a tiltable basket and traction member simplifies the insertion of long objects, improving treatment efficacy for vascular lesions by facilitating thrombosis and aneurysm prevention.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- KANEKA CORP
- Filing Date
- 2022-03-29
- Publication Date
- 2026-06-18
Smart Images
Figure 0007875706000001 
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Abstract
Description
【Technical Field】 【0001】 The present invention relates to a medical device used for a living body lumen such as a blood vessel. 【Background Art】 【0002】 Endovascular treatment is one of the treatment methods for vascular lesions such as aneurysms, arteriovenous malformations, arteriovenous fistulas, pulmonary vascular malformations, renal vascular malformations, renal arteries, and abdominal aneurysms in the head and neck. An embolization technique is used to prevent, for example, the rupture of an aneurysm by promoting thrombosis by placing an embolization device having a coil for embolization at a target site such as inside the aneurysm. 【0003】 When the opening of an aneurysm or the like in the blood vessel wall is large, the coil for embolization placed inside the aneurysm may come out of the aneurysm. In order to prevent the coil placed inside the aneurysm from deviating from the aneurysm, a retaining device may be used which is arranged in the blood vessel inside the aneurysm or near the opening of the aneurysm. Also, an embolization technique is known in which a basket is arranged inside the aneurysm and the aneurysm is filled by packing the coil in this basket to prevent the rupture of the aneurysm. 【0004】 For example, Patent Document 1 describes a device for treating an aneurysm located within a parent vessel defining a lumen, having a neck and inner wall that define a lumen communicating with the lumen, wherein the device is configured to unfold within the lumen, and further comprises a foldable member that, when unfolded, is positioned to rest on the neck of the aneurysm and make contact with its inner wall. Patent Document 2 describes a device comprising a self-expanding elastic permeable shell, comprising a plurality of elongated elastic filaments, each filament having a woven structure fixed to each other at the proximal and distal ends of the filaments; an elongated state configured for delivery within a microcatheter, wherein the thin woven filaments extend longitudinally from the proximal end to the distal end, radially adjacent to each other along the length of the filaments; and an expanded relaxed state having a spherical longitudinally shortened configuration relative to the radially constrained state, wherein the woven filaments form a self-expanding elastic permeable shell in a smooth path extending radially from the longitudinal axis between the proximal and distal ends, the largest of which is configured to allow blood flow through the opening at a speed below the thrombus critical velocity. Patent Document 3 describes an occlusion device comprising: a substantially tubular structure having a proximal end region and a distal end region, having a first expanded state and a second folded state, having dimensions suitable for insertion through the patient's vascular system and through the neck of the aneurysm in the second folded state, having an outer surface that can contact the aneurysm in the expanded state, and further having an inner surface; and a control ring disposed in the proximal end region of the structure, having a substantially annular body that at least substantially surrounds the proximal end region in order to prevent radial expansion of the proximal end region and to provide a feature for engagement when the occlusion device is operated.Patent Document 4 describes an occlusion device comprising a retaining portion formed from a plurality of wires braided into a cylindrical shape with a closed proximal end, a catheter having a tip having a first opening at the closed proximal end and detachably connected to the retaining portion, and the catheter having a passage extending to the distal end of the catheter and aligned with the first opening of the retaining portion, wherein the embolic material in the passage of the catheter can advance through the passage, through the first opening and into the cylindrical shape of the retaining portion. Patent Document 5 describes a self-expanding permeable shell having a proximal end, a distal end, and a longitudinal axis, wherein the shell comprises a plurality of elongated elastic filaments having a braided structure, the filaments being fastened at at least one of the proximal or distal ends of the permeable shell, the permeable shell being configured to be delivered within a microcatheter and being in an expanded state having a configuration that is axially shortened relative to the radially constrained state, the permeable shell having a plurality of openings formed between the braided filaments; the permeable shell in its expanded state comprises a plurality of circumferentially aligned fragments; the device is described. Patent Document 6 describes a device comprising an implant that is movable from a folded state to an unfolded state, the implant having a proximal end, a distal end, and a braided section that forms a substantially continuous braided structure between the proximal end and the distal end, wherein in the unfolded state, the implant has an outer occlusion bag extending from the proximal end of the implant and capable of occluding the neck of an aneurysm, an inner occlusion bag extending from the distal end of the implant and forming a groove within the outer occlusion bag, and a folded portion within the braided section positioned between the outer occlusion bag and the inner occlusion bag. [Prior art documents] [Patent Documents] 【0005】 [Patent Document 1] Special Publication No. 2001-518320 [Patent Document 2] Special Publication No. 2011-519632 [Patent Document 3] Japanese Patent Publication No. 2015-196092 [Patent Document 4] Special Publication No. 2019-506230 [Patent Document 5] Special Publication No. 2020-509922 [Patent Document 6] Japanese Patent Publication No. 2020-58808 [Overview of the project] [Problems that the invention aims to solve] 【0006】 In devices such as those described in Patent Documents 1-6, the opening through which long medical objects such as coils can be inserted is limited, making it difficult to insert long medical objects into the device depending on the condition of the lesion and the procedure. Making it easier to insert long medical objects into the device would increase the size of the device itself, which presents room for improvement. 【0007】 This invention has been made in view of the above circumstances, and its purpose is to provide a medical device that facilitates the insertion of long medical objects into the basket. [Means for solving the problem] 【0008】 The medical device that has been able to solve the aforementioned problem comprises a basket having multiple wires, a connecting member positioned proximal to the basket, a basket pusher positioned proximal to the connecting member, and a traction member connected to the basket. The basket has a first point distal to the proximal end of the basket, which is 1 / 4 of the length from the proximal end of the basket to the distal end of the basket, and the traction member is connected to the basket in a region distal to the first point of the basket. 【0009】 In the medical device of the present invention, it is preferable that the device has an outer cylinder having a distal end and a proximal end, and that the basket is placed in the lumen of the outer cylinder and is expandable when it comes out of the outer cylinder. 【0010】 In the medical device of the present invention, the basket preferably has a second point located proximal to the distal end of the basket, which is 1 / 4 of the length from the proximal end of the basket to the distal end of the basket, and the traction member is preferably connected to the basket in a region distal to the second point of the basket. 【0011】 In the medical device of the present invention, the traction member is preferably connected to the distal end of the basket. 【0012】 In the medical device of the present invention, it is preferable that the traction member is located on the outside of the basket. 【0013】 In the medical device of the present invention, it is preferable that the outer diameter of the traction member is larger than the outer diameter of the wire of the basket. 【0014】 In the medical device of the present invention, the material constituting the traction member is preferably metal. 【0015】 In the medical device of the present invention, it is preferable that the traction member is detachable from the basket. 【0016】 In the medical device of the present invention, the basket comprises a first binding portion that bundles and fixes a plurality of wires at its distal portion and a second binding portion that bundles and fixes a plurality of wires at its proximal portion, wherein, in a cross section perpendicular to the extending direction of the basket pusher, the traction member is preferably arranged inside the first binding portion, and in a cross section perpendicular to the extending direction of the basket pusher at the first binding portion, the wires are preferably arranged outside the traction member. 【0017】 In the medical device of the present invention, it is preferable that the first bundling portion and the second bundling portion contain a radiopaque material. 【Advantages of the Invention】 【0018】 According to the medical device of the present invention, in a region distal to a first point that is distal to the proximal end of the basket and is 1 / 4 of the length from the proximal end of the basket to the distal end of the basket, the traction member is connected to the basket. By pulling the traction member toward the operator side, the basket can be rotationally moved, and the basket can be tilted with respect to the basket pusher. Therefore, for example, in a state where the basket is placed inside a tumor through an opening of the tumor, the side surface of the basket can be directed toward the opening of the tumor. Since the gap between the plurality of wires of the basket is likely to be larger than the proximal end portion and the distal end portion of the basket, it is possible to easily insert a long medical object such as a coil into the basket through the gap between the plurality of wires. 【Brief Description of the Drawings】 【0019】 [Figure 1] It shows a cross-sectional view parallel to the extending direction of the basket pusher at the distal end of the medical device in one embodiment of the present invention. [Figure 2] It shows a cross-sectional view parallel to the extending direction of the basket pusher in a state where the traction member of the medical device shown in FIG. 1 is pulled toward the operator side. [Figure 3] It shows a cross-sectional view parallel to the extending direction of the basket pusher in a state where the basket of the medical device shown in FIG. 1 is accommodated in the outer cylinder. [Figure 4] It shows an IV-IV cross-sectional view of the medical device shown in FIG. 3. 【Embodiments for Carrying Out the Invention】 【0020】 The present invention will be described in more detail below based on the embodiments described below. However, the present invention is not limited by the embodiments described below, and it is certainly possible to implement it with appropriate modifications within the scope that is consistent with the spirit of the preceding and following descriptions, and all such modifications are included within the technical scope of the present invention. In addition, hatching and component reference numerals may be omitted in the drawings for convenience, in which case please refer to the specification or other drawings. Furthermore, the dimensions of various components in the drawings may differ from the actual dimensions, as priority has been given to helping to understand the features of the present invention. 【0021】 Figure 1 is a cross-sectional view of the distal end of the medical device 1 in an embodiment of the present invention, parallel to the extending direction of the basket pusher 40, and Figure 2 is a cross-sectional view parallel to the extending direction of the basket pusher 40 when the traction member 100 is pulled towards the user. In the present invention, the proximal side refers to the side towards the user's hand with respect to the extending direction of the basket pusher 40, and the distal side refers to the opposite side of the proximal side, i.e., the side where the medical device 1 is used for treatment (the lesion side). The extending direction of the basket pusher 40 is sometimes referred to as the longitudinal axis direction. The longitudinal axis direction of the basket pusher 40 can be rephrased as the proximal-to-distal direction of the basket pusher 40. In Figures 1 and 2, the right side of the figure is the proximal side, and the left side of the figure is the distal side. Also, in Figures 1 and 2, in order to make it easier to understand the positional relationships of each member and part, only some of the wires 20 of the multiple wires 20 of the basket 30 are shown, and the other wires 20 are not shown. 【0022】 As shown in Figures 1 and 2, the medical device 1 of the present invention comprises a basket 30 having a plurality of wires 20, a connecting member 80 positioned proximal to the basket 30, a basket pusher 40 positioned proximal to the connecting member 80, and a traction member 100 connected to the basket 30. The basket 30 has a first point P1 located distal to the proximal end 30p of the basket 30, which is 1 / 4 of the length from the proximal end 30p of the basket 30 to the distal end 30d of the basket 30. The traction member 100 is connected to the basket 30 in a region distal to the first point P1 of the basket 30. 【0023】 Medical device 1 can be used in embolization procedures to promote thrombosis and prevent aneurysm rupture by placing a basket 30 in a vascular lesion such as an aneurysm. In embolization, for example, the basket 30 is placed in the aneurysm at the terminal end of the in vivo lumen, in the aneurysm on the side wall of the in vivo lumen, or in the distal end of the main tube of the in vivo lumen, and a long medical object is placed inside the basket 30 placed in the aneurysm or distal end of the main tube to promote thrombosis of the aneurysm. Examples of long medical objects include coils, wires, and string-like objects. Furthermore, the long medical object may be a tube for transporting long objects such as coils. In addition, the long medical object, such as a tube, may transport semi-solid fluids, gels, semi-solids, liquids, or even bag-like objects into the aneurysm. The liquid in the long medical object, such as a tube, may be a liquid that hardens or a liquid that precipitates. 【0024】 As shown in Figures 1 and 2, the basket 30 has multiple wires 20. The basket 30 is expandable and contractible. Specifically, when subjected to an external force, the basket 30 shrinks and becomes smaller in diameter, and when not subjected to an external force, it expands and becomes larger in diameter. When the basket 30 is placed inside a nodule, the basket 30 is in contact with the nodule wall and receives an external force from the nodule, causing it to deform. 【0025】 The material constituting the wire 20 is preferably elastic, and examples include single or stranded metal wires made of stainless steel such as SUS304 and SUS316, platinum, nickel, cobalt, chromium, titanium, tungsten, aluminum, gold, silver, Ni-Ti alloy, Co-Cr alloy, etc. In particular, the material constituting the wire 20 is preferably superelastic, and more preferably a Ni-Ti alloy metal wire. By using a Ni-Ti alloy metal wire as the material constituting the wire 20, the elasticity of the wire 20 is increased, and even if the amount of deformation of the basket 30 released from the outer cylinder 10 is large, the amount of return is large, making it less likely for the shape of the basket 30 to collapse. 【0026】 The basket 30 may have multiple wires 20, and the number of wires 20 can be selected according to the inner diameter of the lumen in the body. In the drawing, the number of wires 20 in the basket 30 is limited. However, in the embodiment of the present invention, the basket 30 can be composed of, for example, 8 to 64 wires 20. The wire diameter of the wires 20 can be set according to the size of the basket 30, the number of wires 20, the material, etc. Preferably, the number of wires 20 in the basket 30 is 16 to 32. 【0027】 As shown in Figures 1 and 2, the connecting member 80 is positioned proximal to the basket 30. The connecting member 80 is a member that connects the basket 30 and the basket pusher 40. In other words, the basket 30 and the basket pusher 40 are connected directly or indirectly via the connecting member 80. By having the connecting member 80 proximal to the basket 30 and distal to the basket pusher 40, the connection between the basket 30 and the basket pusher 40 can be easily made. 【0028】 It is preferable that the connecting member 80 is detachable. In other words, it is preferable that the basket 30 can be detached from the basket pusher 40 by detaching the connecting member 80. Because the connecting member 80 is detachable, after the basket 30 has been transported to the target location, the connecting member 80 can be detached, making it easier to detach the basket 30 from the basket pusher 40 and leave the basket 30 in the target location. 【0029】 Various methods can be used to detach the connecting member 80, such as a mechanical detachment mechanism, melting, thermal, electrical, or chemical detachment. Examples of connecting members 80 include rod-shaped objects, string-shaped objects, clips, and fitting members such as those with protrusions and recesses. The material that makes up the connecting member 80 can be synthetic resin or metal. The connecting member 80 may be a different member from the basket 30 or the basket pusher 40, or it may be a part of them. 【0030】 As shown in Figures 1 and 2, the basket pusher 40 is positioned proximal to the connecting member 80. The basket pusher 40 is connected to the basket 30 via the connecting member 80, and can move the basket 30 in the longitudinal axis direction of the outer cylinder 10, releasing the basket 30 from the outer cylinder 10 or retracting the basket 30 into the outer cylinder 10. Although not shown, the basket pusher 40 may be equipped with a handle at the proximal end of the outer cylinder 10 to control its position and rotation in the longitudinal axis direction. 【0031】 The material constituting the basket pusher 40 is preferably metal, such as stainless steel, carbon steel, or nickel-titanium alloy. Among these, stainless steel is preferred as the material constituting the basket pusher 40. By using stainless steel as the material constituting the basket pusher 40, the rigidity of the basket pusher 40 can be increased. As a result, the force applied to the basket pusher 40 can be efficiently transmitted to the basket 30, making it easier to move the basket 30 in the longitudinal direction. 【0032】 As shown in Figures 1 and 2, the towing member 100 is connected to the basket 30. By pulling the towing member 100 towards the user, the portion of the basket 30 to which the towing member 100 is connected can be pulled. 【0033】 The traction member 100 is preferably a long object, and examples include a linear object, a strip-shaped object, a columnar or cylindrical rod-shaped object, etc. The traction member 100 may be an integral structure composed of one member from the distal end to the proximal end, or it may be composed of multiple members combined together. Among these, the traction member 100 is preferably an integral structure. By having an integral structure, the traction member 100 is less likely to break even when force is applied to it, such as when the traction member 100 is pulled. 【0034】 As shown in Figures 1 and 2, the basket 30 has a first point P1 located distal to the proximal end 30p, which is 1 / 4 of the length from the proximal end 30p to the distal end 30d of the basket 30. In other words, the first point P1 is located distal to the proximal end 30p of the basket 30, which is 1 / 4 of the total length of the basket 30. 【0035】 As shown in Figures 1 and 2, the traction member 100 is connected to the basket 30 in a region distal to the first point P1 of the basket 30. In other words, the traction member 100 is connected to the basket 30 in a region other than the region proximal to the first point P1 of the basket 30. Because the traction member 100 is connected to the basket 30 in a region distal to the first point P1 of the basket 30, pulling the traction member 100 towards the user applies a pulling force toward the user to the portion of the basket 30 to which the traction member 100 is connected. This causes the distal end of the basket 30 to rotate toward the proximal side, resulting in the basket 30 being tilted relative to the basket pusher 40. Therefore, for example, when the basket 30 is placed inside the bump after passing through the bump opening, pulling the traction member 100 causes the distal end of the basket 30 to rotate toward the proximal side, allowing the side of the basket 30 to face the bump opening. The gaps between the multiple wires 20 on the side of the basket 30 tend to be larger than those at the proximal and distal ends of the basket 30, making it easier to insert long medical objects such as coils into the basket 30 through the gaps between the multiple wires 20. 【0036】 Figure 3 is a cross-sectional view of the basket pusher 40 parallel to its extension direction when the basket 30 is housed inside the outer cylinder 10. In Figure 3, the right side of the figure is the proximal side, and the left side is the distal side. 【0037】 As shown in Figure 3, the medical device 1 has an outer cylinder 10 having a distal end 10d and a proximal end 10p, and the basket 30 is preferably placed in the lumen of the outer cylinder 10 and is expandable when it is released from the outer cylinder 10. In other words, it is preferable that the basket 30 is placed in the lumen of the outer cylinder 10 and that it is possible to expand the basket 30 when it is released from the outer cylinder 10. When the basket 30 is placed in the lumen of the outer cylinder 10, it is in contact with the inner wall of the outer cylinder 10 and is in a contracted, reduced diameter state when subjected to external force from the outer cylinder 10. When the basket 30 is released from the outer cylinder 10, it is no longer subjected to that external force, and in the absence of other external forces, it expands and becomes an expanded diameter state. Because the basket 30 is placed in the lumen of the outer cylinder 10, it is easy to transport the basket 30 to the target site, making it easier to perform procedures such as embolization using the medical device 1. 【0038】 The outer cylinder 10 is a cylindrical member extending in the longitudinal direction and has at least one lumen extending in the longitudinal direction. The number of lumens in the outer cylinder 10 may be multiple, but it is preferable that there be one. By having only one lumen in the outer cylinder 10, the outer diameter of the outer cylinder 10 can be reduced, which makes it possible to enhance the minimally invasive nature of the medical device 1. 【0039】 The material constituting the outer cylinder 10 is preferably a resin or a metal. Examples of resins constituting the outer cylinder 10 include polyamide resins, polyester resins, polyurethane resins, polyolefin resins, fluororesins, vinyl chloride resins, silicone resins, and natural rubber. These may be used individually or in combination of two or more. In particular, the resin constituting the outer cylinder 10 is preferably at least one of polyamide resins, polyester resins, polyurethane resins, polyolefin resins, and fluororesins. By having the material constituting the outer cylinder 10 be at least one of polyamide resins, polyester resins, polyurethane resins, polyolefin resins, and fluororesins, the slipperiness of the surface of the outer cylinder 10 can be increased, improving the ease of insertion into tubular structures such as blood vessels. The tube made of resin that becomes the outer cylinder 10 can be manufactured using conventional methods such as extrusion molding and injection molding. 【0040】 Examples of metals that make up the outer cylinder 10 include stainless steel such as SUS304 and SUS316, platinum, nickel, cobalt, chromium, titanium, tungsten, gold, Ni-Ti alloy, Co-Cr alloy, or combinations thereof. The metal tube that forms the outer cylinder 10 may be made by winding metal wire in a spiral shape, or by braiding metal wire. The outer cylinder 10 may also be a tube made of a combination of metal and resin. A cylindrical body made of resin with reinforcing material such as metal wire may be used as the outer cylinder 10. When a resin tubular member with wire arranged on it is used as the outer cylinder 10, wire made of Ni-Ti alloy is preferred because it has excellent shape memory and high elasticity. The wire may also be a fibrous material such as the above-mentioned metal, polyarylate fiber, aramid fiber, ultra-high molecular weight polyethylene fiber, PBO fiber, or carbon fiber. The fibrous material may be a monofilament or a multifilament. 【0041】 The outer cylinder 10 may be composed of a single layer or multiple layers. Furthermore, in the longitudinal axis direction, a portion of the outer cylinder 10 may be composed of a single layer, while the other portion is composed of multiple layers. 【0042】 Preferably, the outer cylinder 10 is coated with a hydrophilic resin on its outer surface. In other words, it is preferable that the outer cylinder 10 has a hydrophilic resin layer on its outside. By coating the outer surface of the outer cylinder 10 with a hydrophilic resin, the slipperiness of the outer cylinder 10 is increased, which improves its ability to pass through a lumen in a living body. 【0043】 Furthermore, it is preferable that the inner surface of the outer cylinder 10 is coated with a fluororesin. In other words, it is preferable that the outer cylinder 10 has a fluororesin layer on its inner surface. Having a fluororesin layer on the inner surface of the outer cylinder 10 improves the slipperiness of the inner surface of the outer cylinder 10, making it easier to move the basket 30 in the longitudinal direction within the lumen of the outer cylinder 10. 【0044】 The cross-sectional shape of the outer cylinder 10 in a section perpendicular to the longitudinal axis may be circular, elliptical, polygonal, or a combination thereof. Similarly, the cross-sectional shape of the lumen of the outer cylinder 10 in a section perpendicular to the longitudinal axis may also be circular, elliptical, polygonal, or a combination thereof. 【0045】 It is preferable that the basket 30 is slidable within a cylinder with an inner diameter of 0.021 inches (0.5334 mm) or less. If the outer cylinder 10 has one lumen, it is preferable that the inner diameter of the outer cylinder 10 is 0.021 inches or less, and that the basket 30 is positioned within the lumen of this outer cylinder 10. If the outer cylinder 10 has multiple lumens, it is preferable that the inner diameter of the lumen in which the basket 30 is positioned is 0.021 inches or less. By allowing the basket 30 to slide within a cylinder with an inner diameter of 0.021 inches or less, the outer diameter of the outer cylinder 10 can be reduced, resulting in a medical device 1 that is easy to insert and minimally invasive. 【0046】 As shown in Figures 1 and 2, the basket 30 has a second point P2 located proximal to the distal end 30d of the basket 30, which is 1 / 4 of the length from the proximal end 30p to the distal end 30d of the basket 30, and it is more preferable that the traction member 100 is connected to the basket 30 in the region distal to the second point P2 of the basket 30. Because the traction member 100 is connected to the basket 30 in the region distal to the second point P2 of the basket 30, when the traction member 100 is pulled towards the user, force is more easily transmitted to the distal end of the basket 30. As a result, the distal end of the basket 30 rotates more easily toward the proximal end, and the basket 30 is more easily tilted relative to the basket pusher 40. 【0047】 As shown in Figures 1 and 2, it is even more preferable that the traction member 100 is connected to the distal end 30d of the basket 30. By connecting the traction member 100 to the distal end 30d of the basket 30, it is easier to transmit the force pulling the traction member 100 toward the hand to the distal end 30d of the basket 30, and the distal end of the basket 30 rotates toward the proximal end, making it possible to tilt the basket 30 relative to the basket pusher 40. 【0048】 As shown in Figures 1 to 3, it is preferable that the towing member 100 is positioned on the outside of the basket 30. In other words, it is preferable that the towing member 100 is located outside the basket 30. By positioning the towing member 100 on the outside of the basket 30, the towing member 100 is positioned along the outside of the basket 30, making it less likely for the towing member 100 to interfere with the wire 20 of the basket 30 when the towing member 100 is pulled towards the user. Therefore, it becomes easier to rotate the distal end of the basket 30 toward the proximal end. 【0049】 Preferably, the outer diameter of the towing member 100 is larger than the outer diameter of the wire 20 of the basket 30. A larger outer diameter for the towing member 100 than the wire 20 of the basket 30 increases the strength of the towing member 100, making it easier to transmit sufficient force to the basket 30 when pulling the towing member 100 towards the user. 【0050】 The outer diameter of the traction member 100 is preferably 1.1 times or more the outer diameter of the wire 20 of the basket 30, more preferably 1.2 times or more, and even more preferably 1.3 times or more. By setting the lower limit of the ratio between the outer diameter of the traction member 100 and the outer diameter of the wire 20 of the basket 30 within the above range, it becomes easier to sufficiently increase the strength of the traction member 100. Furthermore, the outer diameter of the traction member 100 is preferably 5 times or less the outer diameter of the wire 20 of the basket 30, more preferably 4 times or less, and even more preferably 3 times or less. By setting the upper limit of the ratio between the outer diameter of the traction member 100 and the outer diameter of the wire 20 of the basket 30 within the above range, it is possible to prevent the outer diameter of the traction member 100 from becoming too large, thereby reducing the outer diameter of the medical device 1 and making it a minimally invasive medical device 1. 【0051】 The material constituting the traction member 100 is preferably metal. The metal material of the traction member 100 increases its strength, making it less likely to break even when pulled strongly. 【0052】 Examples of metals that make up the traction member 100 include single or stranded metal wires made from stainless steel such as SUS304 and SUS316, platinum, nickel, cobalt, chromium, titanium, tungsten, aluminum, gold, silver, Ni-Ti alloy, Co-Cr alloy, etc. In particular, it is preferable that the metal making up the traction member 100 be a Ni-Ti alloy metal wire. Because the metal making up the traction member 100 is a Ni-Ti alloy metal wire, the traction member 100 becomes elastic, and it is possible to make it less likely for the traction member 100 to damage the inner wall of a biological lumen such as a blood vessel wall or other objects such as the outer cylinder 10 when it comes into contact with them. 【0053】 Preferably, the material constituting the towing member 100 is the same as the material constituting the wire 20 of the basket 30. By having the same material constituting the towing member 100 as the material constituting the wire 20 of the basket 30, it becomes easier to connect the towing member 100 and the basket 30, and damage is less likely to occur even if the towing member 100 and the wire 20 constituting the basket 30 come into contact. 【0054】 It is preferable that the traction member 100 is detachable from the basket 30. By making the traction member 100 detachable from the basket 30, the operation of detaching the traction member 100 can be easily performed when transporting and placing the basket 30 to the target site, thereby reducing the time required for the procedure. 【0055】 Various methods can be used to detach the traction member 100 from the basket 30, including a mechanical detachment mechanism, melting, thermal, electrical, and chemical detachment. In particular, as shown in Figures 1 and 2, the traction member 100 includes a heat-melting member 81 at the connection point with the basket 30, and it is preferable to detach it from the basket 30 by heating the heat-melting member 81. By detaching the traction member 100 from the basket 30 by heating, it becomes possible to easily detach the traction member 100 from the basket 30. 【0056】 The material constituting the heat-melting member 81 contained in the traction member 100 is preferably a thermoplastic resin, and more preferably PVA (polyvinyl alcohol). The use of PVA as the material constituting the heat-melting member 81 in the traction member 100 makes it easier to detach the traction member 100, resulting in a more user-friendly medical device 1. 【0057】 Figure 4 is a cross-sectional view of the basket pusher 40 in medical device 1, perpendicular to the direction of extension. 【0058】 As shown in Figures 1 to 3, the basket 30 includes a first binding portion 51 that bundles and fixes a plurality of wires 20 at its distal end, and a second binding portion 52 that bundles and fixes a plurality of wires 20 at its proximal end. As shown in Figure 4, it is preferable that the traction member 100 is positioned inside the first binding portion 51 in a cross section perpendicular to the extending direction of the basket pusher 40, and that the wires 20 are positioned outside the traction member 100 in a cross section perpendicular to the extending direction of the basket pusher 40 at the first binding portion 51. By positioning the traction member 100 inside the first binding portion 51 and the wires 20 outside the traction member 100, it becomes easier to firmly connect the traction member 100 to the distal end of the basket 30. 【0059】 As shown in Figures 1 and 2, when the traction member 100 is positioned inside the first binding portion 51, and the wire 20 is positioned outside the traction member 100 in a cross section perpendicular to the extending direction of the basket pusher 40 at the first binding portion 51, it is preferable that the distal end 100d of the traction member 100 is located inside the basket 30. By having the distal end 100d of the traction member 100 located inside the basket 30, the part of the traction member 100 that is more proximal to the distal end 100d is fixed inside the first binding portion 51. Therefore, the fixing strength between the traction member 100 and the basket 30 is increased, and it is possible to prevent the traction member 100 from unintentionally coming off the basket 30 when the traction member 100 is pulled towards the user. 【0060】 The first binding portion 51 and the second binding portion 52 preferably contain an X-ray opaque material. Because the first binding portion 51 and the second binding portion 52 contain an X-ray opaque material, the positions of the first binding portion 51, located distal to the basket 30, and the second binding portion 52, located proximal to the basket 30, can be confirmed under X-ray fluoroscopy. As a result, the position of the basket 30 within the body can be determined. 【0061】 Examples of X-ray opaque materials include platinum, gold, tungsten, iridium, tantalum, and alloys combining at least one of these materials. 【0062】 The basket 30 is preferably constructed in a cage-like shape by braiding multiple bent wires 20 or right-handed and left-handed spiral wires 20 between the first binding portion 51 and the second binding portion 52. In particular, the basket 30 is preferably constructed by braiding right-handed spiral wires 20 and left-handed spiral wires 20. By braiding right-handed spiral wires 20 and left-handed spiral wires 20 to construct the basket 30, a cage-like basket 30 with a mesh-like wall surface is formed. As a result, objects contained inside the basket 30 are less likely to fall out of the basket 30, making it easier to efficiently promote thrombosis. 【0063】 To bundle and secure multiple wires 20 at the first and second binding sections 51 and 52, methods such as welding the multiple wires 20 together, crimping them together with a separate component, bonding them with an adhesive, or fixing them with brazing material can be used. Among these, it is preferable to crimp and secure the multiple wires 20 at the first and second binding sections 51 and 52 with a separate component. By crimping and securing the multiple wires 20 at the first and second binding sections 51 and 52 with a separate component, it becomes easier to firmly secure the multiple wires 20 at the first and second binding sections 51 and 52, and the basket 30 becomes less likely to be damaged. 【0064】 In the first binding section 51 and the second binding section 52, examples of separate members for bundling and fixing the multiple wires 20 include a ring-shaped member, a C-shaped member with a notch in the ring, a coil-shaped member with a wire wound around it, and a member for tying and fixing with a string-like material. Among these, it is preferable that the separate member for bundling and fixing the multiple wires 20 be a ring-shaped member. If the separate member for bundling and fixing the multiple wires 20 is a ring-shaped member and is swaged, the multiple wires 20 can be firmly fixed, and the bundling of the multiple wires 20 can be made less likely to be released. 【0065】 As the material for the separate component that bundles and fixes the multiple wires 20, for example, the same material as the wires 20 of the basket 30 or the basket pusher 40 can be used. In particular, the material for the separate component that bundles and fixes the multiple wires 20 is preferably stainless steel. By using stainless steel as the material for the separate component that bundles and fixes the multiple wires 20, the fixing strength of the multiple wires 20 can be increased, and the durability of the separate component that bundles and fixes the multiple wires 20 can be improved. Furthermore, it is even more preferable that the material for the separate component that bundles and fixes the multiple wires 20 is an X-ray opaque material. Examples of X-ray opaque materials include platinum, gold, tungsten, iridium, tantalum, and alloys combining at least one of these. By using an X-ray opaque material for the separate component that bundles and fixes the multiple wires 20, the positions of the first bundling portion 51 and the second bundling portion 52 can be confirmed under X-ray fluoroscopy, making it possible to determine the position of the basket 30 inside the body. 【0066】 As shown in Figure 3, when the basket 30 is housed inside the outer cylinder 10, it is preferable that the first bundling portion 51 is located distal to the distal end 20d of the wire 20. The first bundling portion 51 is the part that bundles and fixes the multiple wires 20 of the basket 30. When the basket 30 is housed inside the outer cylinder 10, the position of the first bundling portion 51 distal to the distal end 20d of the wire 20 makes it less likely for the multiple wires 20 bundled by the first bundling portion 51 to come apart. Therefore, it becomes easier to release the basket 30 from the outer cylinder 10 while the multiple wires 20 maintain their respective phases. 【0067】 As shown in Figure 3, it is preferable that the second binding portion 52 is located proximal to the proximal end 20p of the wire 20. The second binding portion 52, like the first binding portion 51, is the part that bundles and fixes the multiple wires 20 of the basket 30, and therefore tends to have higher rigidity than other parts of the basket 30. By positioning the second binding portion 52 proximal to the proximal end 20p of the wire 20, the rigidity of the proximal end of the basket 30 can be increased, and the force applied from the proximal side to push the basket 30 distally can be efficiently transmitted to the basket 30. As a result, the medical device 1 can be made in which the basket 30 can be easily released from the outer cylinder 10. 【0068】 Preferably, the wire 20 of the basket 30 contains a superelastic alloy. The inclusion of a superelastic alloy in the wire 20 gives the basket 30 excellent elasticity. The excellent elasticity of the basket 30 allows for a large amount of deformation of the basket 30. Therefore, the basket 30 can be housed in an outer cylinder 10 with a small outer diameter, and when the basket 30 is outside the outer cylinder 10, the basket 30 can be greatly expanded. 【0069】 Preferably, the wire 20 of the basket 30 contains an X-ray opaque material. The inclusion of an X-ray opaque material in the wire 20 allows for confirmation of the expansion state and position of the basket 30 under X-ray fluoroscopy, facilitating smoother procedure execution. 【0070】 As shown in Figure 3, it is preferable that the length of the connecting member 80 in the extending direction of the basket pusher 40 is shorter than the length of the basket pusher 40 and the length of the basket 30. By making the length of the connecting member 80 in the extending direction of the basket pusher 40 shorter than the length of the basket pusher 40 and the length of the basket 30, the force applied to the basket pusher 40 from the near side to the distal side to transport the basket 30 to the target location is more easily transmitted to the basket 30, making it easier to transport the basket 30 smoothly. 【0071】 The length of the connecting member 80 in the extending direction of the basket pusher 40 is preferably 70% or less of the length of the basket 30, more preferably 60% or less, and even more preferably 50% or less. By setting the upper limit of the ratio of the length of the connecting member 80 to the length of the basket 30 within the above range, the strength of the connecting member 80 is increased, and the force that pushes the basket pusher 40 toward the distal side is more easily transmitted to the basket 30. Furthermore, the length of the connecting member 80 in the extending direction of the basket pusher 40 is preferably 5% or more of the length of the basket 30, more preferably 7% or more, and even more preferably 10% or more. By setting the lower limit of the ratio of the length of the connecting member 80 to the length of the basket 30 within the above range, the connecting member 80 becomes more flexible, and the basket 30 becomes easier to rotate relative to the basket pusher 40. 【0072】 Preferably, the material constituting the connecting member 80 has the property of melting when heated, and the medical device 1 has a heating mechanism 90 for heating the connecting member 80. Because the material constituting the connecting member 80 has the property of melting when heated, and the medical device 1 has a heating mechanism 90, the connecting member 80 melts and breaks when heated by the heating mechanism 90, allowing the basket 30 to be separated from the basket pusher 40. Therefore, the basket 30 and the basket pusher 40 can be firmly connected by the connecting member 80 until the heating mechanism 90 is activated, and the connecting member 80 can be easily separated when the heating mechanism 90 is activated, so that the basket 30 can be placed securely and easily. 【0073】 The material that makes up the connecting member 80 and melts when heated is preferably a thermoplastic resin, and more preferably PVA (polyvinyl alcohol). Because the material making up the connecting member 80 is PVA, it becomes easier to detach the connecting member 80, making the medical device 1 easier to handle. 【0074】 The heating mechanism 90 is preferably connected to the basket pusher 40. Because the heating mechanism 90 is connected to the basket pusher 40, the connecting member 80 can be heated via the basket pusher 40, eliminating the need to provide a separate component to transfer the heat from the heating mechanism 90 to the connecting member 80, thus enabling miniaturization of the medical device 1. 【0075】 As described above, the medical device of the present invention comprises a basket having multiple wires, a connecting member positioned proximal to the basket, a basket pusher positioned proximal to the connecting member, and a traction member connected to the basket. The basket has a first point distal to the proximal end of the basket, which is 1 / 4 of the length from the proximal end to the distal end of the basket, and the traction member is connected to the basket in a region distal to the first point of the basket. With this configuration, the medical device of the present invention has a traction member connected to the basket in a region distal to the first point, which is 1 / 4 of the length from the proximal end to the distal end of the basket. By pulling the traction member towards the hand, the basket can be rotated and moved, causing the basket to tilt relative to the basket pusher. For example, when the basket has passed through the opening of the aneurysm and is placed inside the aneurysm, the side of the basket can be directed toward the opening of the aneurysm. Because the gaps between the multiple wires in the side of the basket tend to be larger than those at the proximal and distal ends of the basket, it is easier to insert long medical objects such as coils into the basket through the gaps between the multiple wires. [Explanation of Symbols] 【0076】 1: Medical devices 10: Outer cylinder 10d: Distal end of the outer tube 10p: Proximal end of the outer cylinder 20: Wire 20d: Distal end of the wire 20p: Proximal end of the wire 30: Basketball 30d: Distal end of the basket 30p: Proximal end of the basket 40: Basket Pusher 51: 1st binding part 52:Second binding part 80: Connecting member 81: Thermally melted components 90:Heating mechanism 100: Traction Member 100d: Distal end of traction member P1: Point 1 P2: 2nd point
Claims
[Claim 1] A basket with multiple wires, A connecting member located proximal to the aforementioned basket, A basket pusher positioned proximal to the aforementioned connecting member, It has a traction member connected to the basket, The basket has a first bundling portion at its distal end that bundles and secures a plurality of the wires, and a second bundling portion at its proximal end that bundles and secures a plurality of the wires. The basket has a first point located distal to the proximal end of the basket, which is 1 / 4 of the length from the proximal end of the basket to the distal end of the basket. The traction member is connected to the basket in a region distal to the first point of the basket. The traction member is positioned on the outside of the basket. In the first bundling section, the plurality of wires are bundled together by a fixing member having a radial direction. In a cross-section perpendicular to the extending direction of the basket pusher at the first binding portion, the traction member is positioned inward in the radial direction compared to the fixing member, and the wire is positioned outward in the radial direction compared to the traction member in this medical device. [Claim 2] It has an outer cylinder with a distal end and a proximal end, The medical device according to claim 1, wherein the basket is positioned inside the lumen of the outer cylinder and is expandable when it is outside the outer cylinder. [Claim 3] The basket has a second point located proximal to the distal end of the basket, which is 1 / 4 of the length from the proximal end of the basket to the distal end of the basket. The medical device according to claim 1 or 2, wherein the traction member is connected to the basket in a region distal to the second point of the basket. [Claim 4] The medical device according to claim 3, wherein the traction member is connected to the distal end of the basket. [Claim 5] The medical device according to any one of claims 1 to 4, wherein the outer diameter of the traction member is greater than the outer diameter of the wire of the basket. [Claim 6] The medical device according to any one of claims 1 to 5, wherein the material constituting the traction member is metal. [Claim 7] The medical device according to any one of claims 1 to 6, wherein the traction member is detachable from the basket. [Claim 8] The medical device according to any one of claims 1 to 7, wherein the first binding portion and the second binding portion include an X-ray opaque material.