Endoscopic Clip System

Abstract

An endoscope clip system (1) comprises: a medical clip (10) that grips an object; and a linear member (20) that has a distal end and a proximal end, extends in the longitudinal direction, and moves the medical clip (10) in the longitudinal direction thereof. The medical clip (10) has a first part (11) and a second part (12) disposed so as to be mutually opposing. The linear member (20) is provided with a clip connection part (21) that connects the medical clip (10) to the distal side, and is provided with a friction part (60) between an inner surface of the medical clip (10) and an outer surface of the clip connection part (21).

Description

[Technical field]

[0001] The present invention relates to an endoscopic clip system used for the purpose of stopping bleeding or the like in surgery or treatment using an endoscope. [Background technology]

[0002] Treatments using endoscopes, such as endoscopic submucosal dissection (ESD) and endoscopic mucosal resection (EMR), can sometimes cause bleeding during the procedure. In such cases, the clipping method involves using an endoscopic treatment tool with a clip attached to place a clip at the bleeding site and applying pressure to stop the bleeding.

[0003] For example, Patent Document 1 describes a medical treatment tool that includes a force transmission member having a distal end and a base end and an end effector provided at the distal end of the force transmission member, and when a hook is pushed into the rear end of a clip, the rear end of the clip is deformed and the hook engages with the clip. Patent Document 2 describes an endoscopic treatment tool system that includes a treatment tool having an introduction device having a tubular body, a wire, and a connection part provided at the tip of the wire, a connecting member having an engagement part at the base end that can engage with the connection part, and a treatment tool main body provided at the tip of the connecting member, and includes a hook part that includes a substantially conical engagement part that hooks and engages with a clip unit and a wire connection part provided at the base end of the engagement part, and the cross section of the tip of the engagement part is formed in a substantially circular shape, and the cross section of the base end is formed in a substantially rectangular shape. Patent Document 3 describes a clip device that includes a cylindrical body, a wire having a first engagement means at its tip that engages with the clip, and an operation unit for operating the opening and closing of the clip, the clip includes a clip body having a base end and both arms and a fastening member, the base end is provided with a second engagement means, the open arms are closed by the fastening member moving toward the tip side, and a rotationally symmetric polygonal regulating unit that regulates the rotation of the clip body when the tip of the operating wire end hook engages with the clip base end claw may be provided. Patent Document 4 describes a clip device that includes a clip body, an operating tube that can appropriately select a holding position for holding the clip body and a detaching position for attaching and detaching the clip body, and a temperature regulating mechanism for regulating the temperature state of the clip body and opening and closing, and the clip body is insulated by applying a fluororesin coating to the outer surface except for the part that comes into contact with the contact. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2010-5430 A [Patent Document 2] International Publication No. 2006 / 062019 [Patent Document 3] JP 2007-275542 A [Patent Document 4] Japanese Patent Application Publication No. 57-156752 Summary of the Invention [Problem to be solved by the invention]

[0005] When bleeding occurs during a procedure such as ESD or EMR, it is necessary to stop bleeding quickly. To achieve this, it is necessary to rotate the clip so that it is oriented appropriately with respect to the bleeding point, and to reliably grasp the bleeding point with the clip without being pushed back by the reaction force of the tissue at the bleeding point. However, in the endoscopic clip systems such as those in Patent Documents 1 to 4, the clip rotates relative to the linear object of the endoscopic clip system when grasping the clip, making it difficult to orient it appropriately with respect to the bleeding point, or the clip is pushed back by the tissue at the bleeding point, making it difficult to grasp the bleeding point sufficiently, which can result in a long time being required to stop bleeding.

[0006] The present invention has been made in consideration of the above-mentioned circumstances, and its object is to provide an endoscopic clip system in which a medical clip is less likely to rotate relative to a linear object, and which can reliably grasp an object. [Means for solving the problem]

[0007] The endoscopic clip system that can solve the above problem includes a medical clip that grasps an object, and a linear object having a distal end and a proximal end, extending along a longitudinal axis and moving the medical clip along its longitudinal axis, the medical clip having a first part and a second part arranged opposite each other, the linear object having a clip connecting part on the distal side that connects the medical clip, and a friction part between the inner surface of the medical clip and the outer surface of the clip connecting part.

[0008] In the clip system for an endoscope of the present invention, at least one of the first member, the second member and the clip connecting portion preferably includes a friction portion.

[0009] In the clip system for an endoscope of the present invention, the first member, the second member and the clip connecting portion preferably include a friction portion.

[0010] In the clip system for an endoscope of the present invention, it is preferable that the first and second parts are in surface contact with the clip connecting portion at the friction portion.

[0011] In the clip system for an endoscope of the present invention, it is preferable that the material of the friction portion contains an elastic body.

[0012] In the clip system for an endoscope of the present invention, the material of the first part and the second part is preferably the same as the material constituting the friction part.

[0013] In the clip system for an endoscope of the present invention, the material of the clip connecting portion is preferably the same as the material constituting the friction portion.

[0014] In the clip system for an endoscope of the present invention, the friction portion is disposed on the outer surface of the clip connecting portion, and is preferably disposed distal to the proximal end of the clip connecting portion.

[0015] In the clip system for an endoscope of the present invention, it is preferable that the friction portion includes a resin tube disposed outside the clip connecting portion.

[0016] In the endoscopic clip system of the present invention, the medical clip has a longitudinal direction, an opening / closing direction of the medical clip, and a width direction of the medical clip, and the medical clip is configured to connect to the clip connecting portion on the proximal side of the longitudinal direction of the medical clip and to grasp an object on the distal side of the longitudinal direction, and a connecting portion connecting the first part and the second part is disposed on the first end side of the width direction of the medical clip, and it is preferable that the connecting portion is disposed proximal to the midpoint of the longitudinal length of the medical clip.

[0017] In the endoscopic clip system of the present invention, it is preferable that the medical clip further has a cylindrical fastening ring arranged on the outside of the first and second parts, and that the fastening ring is movable longitudinally on the medical clip.

[0018] In the endoscopic clip system of the present invention, it is preferable that the linear object further has a pushing tool capable of moving in the longitudinal direction, and that the distal end of the pushing tool is configured to contact the proximal end of the fastening ring and move the fastening ring distally.

[0019] In the clip system for an endoscope of the present invention, it is preferable that the clip connecting portion has a contact portion that contacts the proximal end of the medical clip.

[0020] In the endoscopic clip system of the present invention, the medical clip further has a first claw portion at the proximal end of the first part extending toward the second part, and a second claw portion at the proximal end of the second part extending toward the first part, and it is preferable that the first claw portion and the second claw portion have a notch along the outer periphery of the linear object.

[0021] In the endoscopic clip system of the present invention, it is preferable that the clip connecting portion has a groove portion that is concave in the circumferential direction of the clip connecting portion, and that the distal wall surface of the groove contacts the distal side surface of the proximal end of the medical clip, and that the proximal wall surface of the groove contacts the proximal side surface of the proximal end of the medical clip. Effect of the Invention

[0022] According to the endoscopic clip system of the present invention, a friction portion is provided between the inner surface of the medical clip and the outer surface of the clip connection portion, making it difficult for the medical clip to rotate relative to the clip connection portion and also difficult for the medical clip to move longitudinally relative to the clip connection portion, making it easier for the medical clip to reliably grasp an object. [Brief description of the drawings]

[0023] [Figure 1] 1 illustrates a plan view of the distal side of an endoscopic clip system in one embodiment of the present invention. [Diagram 2] 2 is a cross-sectional view of the clip system for an endoscope shown in FIG. 1 along line II-II. [Diagram 3] 3 is a cross-sectional view of the clip system for an endoscope shown in FIG. 1 along line III-III. [Figure 4] 2 shows a plan view of the distal side of the linear object of the endoscopic clip system shown in FIG. 1. [Diagram 5] 2 is a plan view of a medical clip of the clip system for an endoscope shown in FIG. 1, without showing a fastening ring. [Figure 6] 6 shows a cross-sectional view of the medical clip shown in FIG. 5 along the line VI-VI. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] The present invention will be described in more detail below based on the following embodiments, but the present invention is not limited to the following embodiments, and can be modified as long as it meets the purpose described above and below, and all of these modifications are included in the technical scope of the present invention. In addition, hatching and component symbols may be omitted in each drawing for convenience, but in such cases, the specification and other drawings should be referred to. In addition, the dimensions of various components in the drawings may differ from the actual dimensions because priority is given to helping understand the features of the present invention.

[0025] FIG. 1 is a plan view of the distal side of a clip system 1 for an endoscope in one embodiment of the present invention, and FIGS. 2 and 3 are cross-sectional views perpendicular to the longitudinal direction of the clip system 1 for an endoscope.

[0026] 1 to 3, an endoscopic clip system 1 of the present invention includes a medical clip 10 for gripping an object, and a linear object 20 having a distal end and a proximal end, extending along a longitudinal axis, and moving the medical clip 10 along the longitudinal axis. After gripping a target site inside the body, the medical clip 10 is separated from the linear object 20 at the connecting portion, and the linear object 20 is removed from the body.

[0027] In the present invention, the proximal side refers to the hand side of the user in the extending direction of the linear object 20, and the distal side refers to the opposite side of the proximal side, i.e., the side to be treated. The extending direction of the linear object 20 is called the longitudinal direction. The longitudinal direction can be rephrased as the direction of approach and distance of the linear object 20. The radial direction refers to the radial direction of the circumscribing circle of the cross-sectional shape of the linear object 20 in the longitudinal direction, the inward direction in the radial direction refers to the direction toward the axial center of the circumscribing circle of the cross-sectional shape of the linear object 20, and the outward direction in the radial direction refers to the direction toward the opposite side to the inward direction. In addition, in Figures 1, 4, and 5, the right side of the figure is the proximal side, and the left side of the figure is the distal side.

[0028] The medical clip 10 is attached to a linear object 20 of an endoscopic clip system 1 in an endoscopic procedure such as ESD or EMR, and is used for stopping bleeding, suturing a lesion, or the like.

[0029] Examples of materials constituting the medical clip 10 include stainless steels such as SUS301, SUS303, SUS304, and SUS631, Ni-Ti alloys, and the like. Among these, it is preferable that the material constituting the medical clip 10 is stainless steel. By using stainless steel as the material constituting the medical clip 10, the medical clip 10 becomes highly elastic, and the biocompatibility of the medical clip 10 can be improved.

[0030] The linear object 20 has a longitudinal direction. That is, the linear object 20 extends along the longitudinal axis. The linear object 20 may be tubular having an inner cavity extending along the longitudinal axis, but is preferably solid. By making the linear object 20 solid, the rigidity of the linear object 20 can be increased without excessively increasing the outer diameter of the linear object 20. As a result, the insertability of the endoscopic clip system 1 can be improved. The linear object 20 may be a single wire, or a twisted wire in which single wires are twisted together. If the linear object 20 is a single wire, it is easy to manufacture. If the linear object 20 is a twisted wire, the strength of the linear object 20 can be increased, so that the operation on the hand side is easily transmitted to the distal end including the medical clip 10 and the clip connecting portion 21. The cross-sectional shape of the wire constituting the linear object 20 may be, for example, a circular shape, an elliptical shape, a polygonal shape, or a combination of these shapes.

[0031] Examples of materials constituting the linear object 20 include metals such as stainless steels, such as SUS301, SUS303, SUS304, and SUS631, and carbon steel, and synthetic resin fibers, such as polyamide resins, such as nylon, polyolefin resins, such as PP and PE, polyester resins, such as PET, aromatic polyether ketone resins, such as PEEK, polyimide resins, and fluororesins, such as PTFE, PFA, and ETFE. Among these, the material constituting the linear object 20 is preferably stainless steel. By using stainless steel as the material constituting the linear object 20, it is possible to improve biocompatibility while providing the strength required for the endoscopic clip system 1.

[0032] Although not shown, the linear object 20 may have a coating layer on the surface. By having the linear object 20 have a coating layer, it is possible to reduce friction on the surface of the linear object 20 and increase the sliding property, and to increase the strength of the linear object 20. Examples of the coating layer include fluororesins such as PTFE, PFA, ETFE, and tetrafluoroethylene-hexafluoropropylene copolymer (FEP).

[0033] The coating layer can be formed on the linear object 20 by, for example, coating the linear object 20 with a material for forming the coating layer, and methods such as a dipping method, a spraying method, a fluidized bed method, and a kneader coater method can be used.

[0034] The longitudinal length of the linear object 20 can be appropriately selected in consideration of the distance from the forceps port of the endoscope to the treatment target site, and can be, for example, 1000 mm or more and 3000 mm or less. By providing a handle on the proximal side of the linear object 20, the medical clip 10 and the linear object 20 can be easily operated.

[0035] The outer diameter of the linear object 20 is preferably 100 μm or more, more preferably 200 μm or more, and even more preferably 300 μm or more. By setting the lower limit of the outer diameter of the linear object 20 within the above range, the rigidity of the linear object 20 can be increased. Furthermore, the outer diameter of the linear object 20 is preferably 900 μm or less, more preferably 800 μm or less, and even more preferably 700 μm or less. By setting the upper limit of the outer diameter of the linear object 20 within the above range, the linear object 20 can be made thinner, and the insertability of the endoscopic clip system 1 can be improved.

[0036] The outer diameter of the linear object 20 may be the same or different over the entire length. For example, the proximal portion of the linear object 20 may be thickened for reinforcement. As a method for reinforcing the linear object 20, for example, a tubular part may be disposed on the outer surface of the linear object 20.

[0037] Fig. 4 is a plan view of the distal side of the linear object 20 of the endoscopic clip system 1. As shown in Fig. 4, the linear object 20 has a clip connecting portion 21 for connecting the medical clip 10 to the distal side. The medical clip 10 can be attached to the linear object 20 by connecting the medical clip 10 to the clip connecting portion 21. In other words, the linear object 20 has a distal end and a proximal end, extends along a longitudinal axis, and moves the medical clip 10 along the longitudinal axis.

[0038] The clip connecting part 21 is provided on the linear object 20. For the operation of the medical clip 10, the clip connecting part 21 is provided on the distal side of the linear object 20, and is preferably provided on the distal end of the linear object 20. The linear object 20 preferably has a portion, as the clip connecting part 21, whose outer diameter increases toward the distal side. The clip connecting part 21 may be a part of the linear object 20, or may be configured by attaching a separate part (hereinafter, sometimes referred to as a "clip connecting part") for connecting the medical clip 10 to the linear object 20. The clip connecting part 21 may be disposed, for example, on the distal end of the linear object 20.

[0039] When the clip connecting portion 21 is a clip connecting part attached to the linear object 20, the material of the clip connecting part may be, for example, a metal such as stainless steel or carbon steel, a polyamide resin such as nylon, a polyolefin resin such as PP or PE, a polyester resin such as PET, an aromatic polyetherketone resin such as PEEK, a polyimide resin, or a synthetic resin such as fluororesin such as PTFE, PFA, or ETFE. Among them, the material of the clip connecting part is preferably the same as the material of the linear object 20. By using the same material of the clip connecting part as the material of the linear object 20, the connection between the clip connecting part and the linear object 20 can be made strong, so that the clip connecting part is less likely to come off from the linear object 20. As a result, the durability of the endoscopic clip system 1 can be increased.

[0040] When the clip connecting portion 21 is a clip connecting part, the method of fixing the clip connecting part to the linear object 20 can be, for example, mechanical fixing using a connecting member such as a screw, crimping, fitting, or press-fitting, welding using a laser, silver solder, or heat, or adhesion using an adhesive or tape. Among these, it is preferable that the clip connecting part is fixed to the linear object 20 by welding. Fixing the clip connecting part to the linear object 20 by welding can increase the bonding strength between the clip connecting part and the linear object 20.

[0041] FIG. 5 is a plan view of the medical clip 10, and FIG. 6 is a cross-sectional view perpendicular to the longitudinal direction of the medical clip 10. As shown in FIG. 5 and FIG. 6, the medical clip 10 has a first part 11 and a second part 12 arranged opposite to each other, and has a friction part 60 between the inner surface of the medical clip 10 and the outer surface of the clip connecting part 21. By providing the friction part 60 to the medical clip 10, the friction force generated between the inner surface of the medical clip 10 and the outer surface of the clip connecting part 21 is increased, making the medical clip 10 less likely to rotate relative to the clip connecting part 21 and also less likely to move along the longitudinal axis relative to the clip connecting part 21. This makes it easier for the medical clip 10 to grip an object.

[0042] The friction part 60 may be provided on the inner surface of the medical clip 10, or on the outer surface of the clip connecting part 21, or may be configured by disposing a separate part (hereinafter, sometimes referred to as a "friction part part") that constitutes the friction part 60 between the inner surface of the medical clip 10 and the outer surface of the clip connecting part 21. When the friction part 60 is provided on the inner surface of the medical clip 10 or the outer surface of the clip connecting part 21, for example, at least one of the inner surface of the medical clip 10 and the outer surface of the clip connecting part 21 is coated with a material that constitutes the friction part 60, at least one of the inner surface of the medical clip 10 and the outer surface of the clip connecting part 21 is covered with a resin tube and fixed to form the friction part 60, at least one of the inner surface of the medical clip 10 and the outer surface of the clip connecting part 21 is roughened to increase the frictional force to form the friction part 60, and the like. When the friction portion 60 is constructed by arranging friction portion parts between the inner surface of the medical clip 10 and the outer surface of the clip connecting portion 21, for example, a resin sheet or a resin tube can be arranged between the inner surface of the medical clip 10 and the outer surface of the clip connecting portion 21.

[0043] The friction portion 60 is preferably disposed in at least one of the first part 11, the second part 12, and the clip connecting part 21. That is, at least one of the first part 11, the second part 12, and the clip connecting part 21 preferably includes the friction portion 60. By providing at least one of the first part 11, the second part 12, and the clip connecting part 21 with the friction portion 60, it is possible to increase the friction force between at least one of the first part 11 and the clip connecting part 21 and between the second part 12 and the clip connecting part 21, and the medical clip 10 becomes less likely to rotate and move along the longitudinal axis relative to the clip connecting part 21.

[0044] It is also preferable that the friction portion 60 is disposed in the first part 11, the second part 12, and the clip connecting part 21. That is, it is also preferable that the first part 11, the second part 12, and the clip connecting part 21 include the friction portion 60. In other words, it is also preferable that the friction portion 60 is disposed in all of the first part 11, the second part 12, and the clip connecting part 21. By providing the friction portion 60 in the first part 11, the second part 12, and the clip connecting part 21, it is possible to increase both the friction force generated between the first part 11 and the clip connecting part 21 and the friction force generated between the second part 12 and the clip connecting part 21, and it is possible to make the medical clip 10 even more difficult to rotate with respect to the clip connecting part 21 and to move along the longitudinal axis.

[0045] In addition, in the friction portion 60, it is preferable that the first part 11 and the second part 12 are in surface contact with the clip connecting part 21. The first part 11 and the second part 12 are in surface contact with the clip connecting part 21, thereby making it possible to further increase the frictional force between the medical clip 10 and the clip connecting part 21. The surface where the first part 11 and the second part 12 are in contact with the clip connecting part 21 may be flat or curved. In addition, there may be a plurality of surfaces where the first part 11 and the second part 12 are in contact with the clip connecting part 21.

[0046] The material of the friction part 60 preferably contains an elastic body. Examples of the elastic body contained in the material of the friction part 60 include synthetic rubber such as natural rubber, urethane rubber, and silicone rubber, and polyamide elastomers such as polyether ester amide elastomer and polyamide ether elastomer. Among them, the elastic body contained in the material of the friction part 60 is preferably a polyamide elastomer, and more preferably a polyether block amide elastomer. When the elastic body contained in the material of the friction part 60 is a polyamide elastomer, the flexibility of the friction part 60 is increased, and the friction part 60 is easily fitted to the inner surface of the medical clip 10 and the outer surface of the clip connecting part 21. Therefore, it is possible to increase the friction force between the inner surface of the medical clip 10 and the outer surface of the clip connecting part 21.

[0047] The material of the first part 11 and the second part 12 is preferably the same as the material constituting the friction part 60. By using the same material of the first part 11 and the second part 12 as the material constituting the friction part 60, the frictional force generated between the first part 11 and the second part 12 and the friction part 60 is increased, and the effect of preventing rotation and longitudinal movement of the medical clip 10 with respect to the clip connecting part 21 can be enhanced.

[0048] It is also preferable that the material of the clip connecting part 21 is the same as the material constituting the friction part 60. By using the same material of the clip connecting part 21 as the material constituting the friction part 60, the frictional force between the clip connecting part 21 and the friction part 60 can be increased, making it difficult for the medical clip 10 to rotate and move in the longitudinal direction relative to the clip connecting part 21.

[0049] 4, the friction portion 60 is disposed on the outer surface of the clip connecting portion 21, and is preferably disposed distal to the proximal end 21p of the clip connecting portion 21. By disposing the friction portion 60 on the outer surface of the clip connecting portion 21, and distal to the proximal end 21p of the clip connecting portion 21, when the medical clip 10 is connected to the clip connecting portion 21, the proximal end 21p of the clip connecting portion 21 and the medical clip 10 are likely to come into direct contact with each other, and it is therefore easier to reliably connect the medical clip 10 to the clip connecting portion 21.

[0050] The friction portion 60 is preferably disposed on the outer surface of the clip connecting portion 21, distal to the proximal end 21p of the clip connecting portion 21 and proximal to the distal end 21d of the clip connecting portion 21. By disposing the friction portion 60 distal to the proximal end 21p of the clip connecting portion 21 and proximal to the distal end 21d of the clip connecting portion 21, for example, when connecting the medical clip 10 to the clip connecting portion 21 by inserting the distal end 21d of the clip connecting portion 21 from the proximal end 10p of the medical clip 10, the distal end 21d of the clip connecting portion 21 does not have the friction portion 60, making it easier to connect to the medical clip 10, and thus making it possible to provide an endoscopic clip system 1 in which the medical clip 10 can be easily attached.

[0051] It is preferable that the friction portion 60 includes a resin tube disposed outside the clip connecting portion 21. Since the friction portion 60 includes a resin tube, it is easy to provide the friction portion 60 and to make the thickness of the friction portion 60 uniform, so that the manufacturing efficiency of the clip system 1 for an endoscope can be improved.

[0052] The resin tube constituting the friction portion 60 only needs to be disposed outside the clip connecting portion 21, and may be disposed, for example, on the outer peripheral surface of the clip connecting portion 21 or on the inner peripheral surface of the medical clip 10. In particular, the resin tube constituting the friction portion 60 is preferably disposed on the outer peripheral surface of the clip connecting portion 21. By disposing the resin tube constituting the friction portion 60 on the outer peripheral surface of the clip connecting portion 21, it becomes easier to provide the friction portion 60 while ensuring a sufficient frictional force generated between the inner surface of the medical clip 10 and the outer surface of the clip connecting portion 21, and the efficiency of manufacturing the endoscopic clip system 1 can be improved.

[0053] 5 and 6, the medical clip 10 has a longitudinal direction, an opening / closing direction of the medical clip 10, and a width direction of the medical clip 10, and the medical clip 10 is configured to be connected to the clip connecting part 21 on the proximal side of the longitudinal direction of the medical clip 10 and to grip an object on the distal side of the longitudinal direction, and a connecting part 13 that connects the first part 11 and the second part 12 is disposed on the first end side of the width direction of the medical clip 10, and the connecting part 13 is preferably disposed on the proximal side of the midpoint P1 of the longitudinal length of the medical clip 10. By disposing the connecting part 13 on the first end side of the width direction of the medical clip 10, the distance between the first part 11 and the second part 12 is less likely to change when an external force is applied to the medical clip 10, and the medical clip 10 is less likely to be unintentionally detached from the clip connecting part 21. In addition, since the connecting portion 13 is disposed proximal to the midpoint P1 of the longitudinal length of the medical clip 10, the clip connecting portion 21 can be easily fitted to the medical clip 10 and difficult to come off, and the handleability of the endoscopic clip system 1 can be improved. In FIG. 5, the left-right direction of the paper corresponds to the longitudinal direction, the up-down direction of the paper corresponds to the opening and closing direction of the medical clip 10, and the front-to-back direction of the paper corresponds to the width direction of the medical clip 10. In three-dimensional coordinates, when the x-axis direction is the longitudinal direction, the y-axis direction can be the opening and closing direction, and the z-axis direction can be the width direction. The medical clip 10 is configured to connect to the clip connecting portion 21 of the linear object 20 on the proximal side of the longitudinal direction and to grip an object on the distal side of the longitudinal direction.

[0054] The medical clip 10 may be formed, for example, by bending a single metal plate including the first portion 11, the second portion 12, and the connecting portion 13, or may be formed by joining a part including the first portion 11, a part including the second portion 12, and a part including the connecting portion 13. In particular, the medical clip 10 is preferably formed by bending a single metal plate including the first portion 11, the second portion 12, and the connecting portion 13. By forming the medical clip 10 from a single metal plate, there is less variation in the product during the manufacture of the medical clip 10, and the manufacturing efficiency of the medical clip 10 can be improved.

[0055] When the medical clip 10 is formed by joining together a part including the first part 11, a part including the second part 12, and a part including the connecting part 13, the part including the connecting part 13 and the part including the first part 11 and the part including the second part 12 can be joined by, for example, mechanical fixing using a connecting member such as a screw, crimping, fitting, or press-fitting, welding using a laser, silver solder, or heat, or adhesion using an adhesive or tape. Among these, the method for joining the part including the connecting part 13 to the part including the first part 11 and the part including the second part 12 is preferably welding. By joining the parts by welding, the joining strength of the parts can be increased.

[0056] The length from the distal end 13d of the connecting part 13 to the proximal end 13p of the connecting part 13 is preferably greater than at least one of the width of the proximal end of the first part 11 and the width of the proximal end of the second part 12. Since the length from the distal end 13d of the connecting part 13 to the proximal end 13p is greater than at least one of the width of the proximal end of the first part 11 and the width of the proximal end of the second part 12, the connecting part 13 can easily prevent the distance between the first part 11 and the second part 12 from changing, and for example, when the clip connecting part 21 is fitted between the first part 11 and the second part 12, the distance between the first part 11 and the second part 12 can be prevented from widening, causing the clip connecting part 21 to come off the medical clip 10.

[0057] It is more preferable that the connection part 13 is disposed proximal to the midpoint P1 of the longitudinal length of the medical clip 10 and distal to the proximal end of the medical clip 10. By disposing the connection part 13 proximal to the midpoint P1 of the longitudinal length of the medical clip 10 and distal to the proximal end of the medical clip 10, the medical clip 10 is less likely to be deformed or damaged due to being widely opened.

[0058] The distal end 21d of the clip connecting part 21 is preferably disposed distal to the proximal end 13p of the connecting part 13. By disposing the distal end 21d of the clip connecting part 21 distal to the proximal end 13p of the connecting part 13, the contact area between the inner surface of the medical clip 10 and the outer surface of the clip connecting part 21 can be made sufficient. Therefore, during treatment using the endoscopic clip system 1 after the medical clip 10 is attached to the clip connecting part 21, it is possible to prevent the medical clip 10 from unintentionally falling off the clip connecting part 21.

[0059] The distal end 21d of the clip connecting part 21 is disposed distal to the proximal end 13p of the connecting part 13, and more preferably, the proximal end 21p of the clip connecting part 21 is disposed proximal to the proximal end 13p of the connecting part 13. In addition to the distal end 21d of the clip connecting part 21 being disposed distal to the proximal end 13p of the connecting part 13, the proximal end 21p of the clip connecting part 21 is disposed proximal to the proximal end 13p of the connecting part 13, so that a larger area can be secured where the inner surface of the medical clip 10 is in contact with the outer surface of the clip connecting part 21. As a result, the frictional force generated between the inner surface of the medical clip 10 and the outer surface of the clip connecting part 21 can be increased, making it possible to make the medical clip 10 less likely to fall off the clip connecting part 21.

[0060] 1, the endoscopic clip 10 further has a cylindrical fastening ring 30 disposed outside the first part 11 and the second part 12, i.e., on the outer periphery of the medical clip 10, and it is preferable that the fastening ring 30 is movable in the longitudinal direction on the medical clip 10. Since the endoscopic clip 10 has the fastening ring 30, the medical clip 10 is less likely to be pushed back by the object, and the object can be sufficiently grasped by closing the medical clip 10.

[0061] The material of the fastening ring 30 may be the same as that of the medical clip 10, and examples of such materials include stainless steels such as SUS301, SUS303, SUS304, and SUS631, and metals such as Ni-Ti alloys. Of these, the material of the fastening ring 30 preferably contains stainless steel. By including stainless steel in the material of the fastening ring 30, the fastening ring 30 can be made highly elastic. Therefore, the fastening ring 30 can easily press the medical clip 10 from the outside, making it easy to close the medical clip 10.

[0062] As shown in FIG. 1, the linear object 20 further has a pusher 40 capable of moving in the longitudinal direction, and the distal end 40d of the pusher 40 is preferably configured to contact the proximal end 30p of the fastening ring 30 to move the fastening ring 30 distally. By the linear object 20 having the pusher 40, it becomes easy to move the fastening ring 30 distally, and it becomes easy to close the medical clip 10 and grasp the target object. The pusher 40 is preferably operated by an operating handle disposed on the proximal side of the linear object 20. When the pusher 40 is operated by the operating handle, the linear object 20 and the pusher 40 are preferably integrated via the operating handle.

[0063] The pushing tool 40 is preferably tubular, with the linear object 20 disposed in the inner cavity of the pushing tool 40. By disposing the linear object 20 in the inner cavity of the pushing tool 40, the pushing tool 40 can be moved along the linear object 20, making it easier to move the pushing tool 40 in the longitudinal direction. The pushing tool 40 pushes the fastening ring 30 to move it from the proximal side to the distal side of the medical clip 10. For this reason, the distal end of the pushing tool 40 is preferably tubular with a cross-sectional size that is the same as or similar to that of the fastening ring 30.

[0064] Examples of the material of the pressing tool 40 include stainless steel such as SUS304 and SUS316, metals such as platinum, nickel, cobalt, chromium, titanium, tungsten, gold, Ni-Ti alloy, and Co-Cr alloy, polyamide resins such as nylon, polyolefin resins such as polyethylene and polypropylene, polyester resins such as polyethylene terephthalate (PET), aromatic polyether ketone resins such as polyether ether ketone (PEEK), polyimide resins, and synthetic resins such as polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), and ethylene-tetrafluoroethylene copolymer (ETFE), etc. Among these, the material of the pressing tool 40 is preferably a metal, and more preferably contains stainless steel. Since the material of the pusher 40 is metal, the pusher 40 is less likely to be crushed when the distal end 40d of the pusher 40 comes into contact with the proximal end 30p of the fastening ring 30, and the force applied to the pusher 40 is sufficiently transmitted to the fastening ring 30, making it easier to move the fastening ring 30 distally.

[0065] Although not shown, the distal end of the pushing tool 40 is preferably a coil. By forming the distal end of the pushing tool 40 as a coil, the distal end of the pushing tool 40 is easily bent. Therefore, even if the distal end of the endoscopic clip system 1 is curved when the medical clip 10 is gripped on an object, the fastening ring 30 can be easily moved distally by the pushing tool 40.

[0066] 1 and 4, the clip connecting portion 21 preferably has a contact portion 22 that contacts the proximal end 10p of the medical clip 10. By having the clip connecting portion 21 have the contact portion 22, the contact portion 22 contacts the proximal end 10p of the medical clip 10, thereby preventing movement of the linear object 20 in the direction along the longitudinal axis, and making it difficult for the medical clip 10 to come off from the clip connecting portion 21 in an unintended situation.

[0067] 5 and 6, the medical clip 10 further has a first claw portion 51 extending toward the second portion 12 at the proximal end of the first portion 11, and a second claw portion 52 extending toward the first portion 11 at the proximal end of the second portion 12, and as shown in Fig. 2, the first claw portion 51 and the second claw portion 52 preferably have a notch 53 along the outer periphery of the linear object 20. Since the medical clip 10 has the first claw portion 51 and the second claw portion 52, it has the effect of preventing the linear object 20 from moving proximally relative to the medical clip 10 and preventing the medical clip 10 from unintentionally coming off the linear object 20. Furthermore, since the first claw portion 51 and the second claw portion 52 have a notch 53 that follows the outer circumference of the linear object 20, when attaching the medical clip 10 to the linear object 20, even if the medical clip 10 has the first claw portion 51 and the second claw portion 52 at the proximal ends of the first part 11 and the second part 12, the linear object 20 passes through the notch 53, making it easy to attach the medical clip 10 to the linear object 20.

[0068] When the gripping of the object by the medical clip 10 is completed and the medical clip 10 is to be removed from the linear object 20 to place the medical clip 10, it is preferable that the clip connecting part 21 pushes the first claw part 51 and the second claw part 52 from the distal side toward the proximal side to deform them, so that the clip connecting part 21 passes through the notch 53, and the clip connecting part 21 moves to the proximal side to remove the medical clip 10 from the linear object 20. The clip connecting part 21 deforms the first claw part 51 and the second claw part 52 to pass through the notch 53, and removes the medical clip 10 from the linear object 20. As a result, the clip connecting part 21 does not move to the proximal side unless a force greater than the deformation of the first claw part 51 and the second claw part 52 is applied to the clip connecting part 21, thereby preventing the medical clip 10 from being unintentionally removed from the linear object 20.

[0069] The first claw portion 51 may be formed by bending the proximal end of the first portion 11, or may be formed by joining a part constituting the first claw portion 51 (hereinafter, sometimes referred to as a "first claw part") to the proximal end of the first portion 11. Similarly, the second claw portion 52 may be formed by bending the proximal end of the second portion 12, or may be formed by joining a part constituting the second claw portion 52 (hereinafter, sometimes referred to as a "second claw part") to the proximal end of the second portion 12. Among them, it is preferable that the first claw portion 51 is formed by bending the proximal end of the first portion 11, and the second claw portion 52 is formed by bending the proximal end of the second portion 12. Since the first claw portion 51 is formed by bending the proximal end of the first part 11 and the second claw portion 52 is formed by bending the proximal end of the second part 12, the first claw portion 51 is prevented from coming off the first part 11 and the second claw portion 52 is prevented from coming off the second part 12. Even if a load is applied to the first claw portion 51 and the second claw portion 52 when attaching the medical clip 10 to the clip connecting part 21 or removing the medical clip 10 from the clip connecting part 21, the first claw portion 51 and the second claw portion 52 of the medical clip 10 are less likely to be damaged.

[0070] When the first claw portion 51 is formed by joining the first claw part to the first part 11, and the second claw portion 52 is formed by joining the second claw part to the second part 12, the first claw part and the second claw part can be joined to the first part 11 and the second part 12, respectively, by, for example, mechanical fixing using a connecting member such as a screw, crimping, fitting, or press-fitting, welding using a laser or heat, or adhesion using an adhesive or tape. Among them, the method of joining the first claw part and the second claw part to the first part 11 and the second part 12, respectively, is preferably welding. By joining each part by welding, it is possible to increase the joining strength of the first claw part to the first part 11 and the joining strength of the second claw part to the second part 12.

[0071] 1 and 4, the clip connecting part 21 has a groove part 23 that is recessed in the circumferential direction of the clip connecting part 21, and the distal side wall surface 24d of the groove part 23 is in contact with the distal side surface of the proximal end 10p of the medical clip 10, and the proximal side wall surface 24p of the groove part 23 is preferably in contact with the proximal side surface of the proximal end 10p of the medical clip 10. Since the distal side wall surface 24d of the groove part 23 is in contact with the distal side surface of the proximal end 10p of the medical clip 10 and the proximal side wall surface 24p of the groove part 23 is in contact with the proximal side surface of the proximal end 10p of the medical clip 10, the proximal end of the medical clip 10 is fitted into the groove part 23 of the clip connecting part 21, so that the medical clip 10 is firmly fixed to the clip connecting part 21, and the medical clip 10 is less likely to fall off unintentionally when the endoscopic clip system 1 is used.

[0072] The depth of groove 23 is preferably greater than the thickness of first claw 51 and second claw 52. The depth of groove 23 indicates the size of groove 23 in the radial direction of clip connecting part 21, the thickness of first claw 51 indicates the size of first claw 51 in the longitudinal direction, and the thickness of second claw 52 indicates the size of second claw 52 in the longitudinal direction. Since groove 23 is deeper than the thickness of first claw 51 and second claw 52, ​​clip connecting part 21 can be easily fitted into medical clip 10 from the second end side of medical clip 10 in the width direction, and medical clip 10 can be easily attached to clip connecting part 21.

[0073] Although not shown, the endoscopic clip system 1 preferably has a handle connected to a proximal end of the linear object 20. The handle is a member that is gripped by a user when operating the endoscopic clip system 1. By having the handle, the endoscopic clip system 1 can be easily operated.

[0074] As described above, the endoscopic clip system of the present invention includes a medical clip for gripping an object, and a linear object having a distal end and a proximal end, extending along a longitudinal axis, and moving the medical clip along the longitudinal axis, the medical clip having a first part and a second part arranged opposite each other, the linear object having a clip connecting part for connecting the medical clip on the distal side, and a friction part between the inner surface of the medical clip and the outer surface of the clip connecting part. By providing the friction part between the inner surface of the medical clip and the outer surface of the clip connecting part, the friction force generated between the medical clip and the clip connecting part is increased, the medical clip is less likely to rotate relative to the clip connecting part, and the medical clip is less likely to move along the longitudinal axis relative to the clip connecting part, making it easier for the medical clip to grip the object reliably.

[0075] This application claims the benefit of priority based on Japanese Patent Application No. 2019-208965, filed on November 19, 2019. The entire contents of the specification of Japanese Patent Application No. 2019-208965, filed on November 19, 2019, are incorporated by reference into this application. [Explanation of symbols]

[0076] 1: Endoscopic clip system 10: Medical clips 10p: Proximal end of medical clip 11: Part 1 12: Part 2 13: Connection 13d: Distal end of connection 13p: Proximal end of the connection 20: Linear object 21: Clip connection part 21d: Distal end of clip connection 21p: Proximal end of clip connection 22: Contact part 23: Groove 24d: Distal wall of groove 24p: Proximal wall of the groove 30: Fastening ring 30p: Proximal end of fastening ring 40: Pressing tool 40d: Distal end of pusher 51: 1st claw part 52:Second claw part 53:Notch 60:Friction part P1: Midpoint of the longitudinal length of the medical clip

Claims

1. A medical clip for gripping an object; a wire having a distal end and a proximal end, extending along a longitudinal axis, for moving the medical clip along the longitudinal axis; The medical clip has a first portion and a second portion disposed opposite one another; the linear object has a clip connecting portion for connecting the medical clip to a distal side thereof, A friction portion is provided between an inner surface of the medical clip and an outer surface of the clip connecting portion, The friction portion is disposed on an outer surface of the clip connecting portion and is disposed distal to a proximal end of the clip connecting portion, A clip system for an endoscope, wherein the friction portion includes a resin tube arranged outside the clip connection portion.

2. The clip connecting portion has a groove portion that is recessed in a circumferential direction of the clip connecting portion, a distal wall surface of the groove contacts a distal side surface of a proximal end of the medical clip; The clip system for an endoscope according to claim 1 , wherein the proximal wall surface of the groove is in contact with a proximal side surface of the proximal end of the medical clip.

3. The clip system for an endoscope according to claim 1 or 2, wherein at least one of the first portion, the second portion and the clip connecting portion includes the friction portion.

4. The clip system for an endoscope according to any one of claims 1 to 3, wherein the first portion, the second portion and the clip connecting portion are provided with the friction portion.

5. The clip system for an endoscope according to any one of claims 1 to 4, wherein the first and second parts are in surface contact with the clip connecting portion at the friction portion.

6. The clip system for an endoscope according to any one of claims 1 to 5, wherein a material of the friction portion includes an elastic body.

7. The clip system for an endoscope according to any one of claims 1 to 5, wherein the material of the first portion and the second portion is the same as the material constituting the friction portion.

8. The clip system for an endoscope according to any one of claims 1 to 5, wherein the material of the clip connecting portion is the same as the material constituting the friction portion.

9. the medical clip has a longitudinal direction, an opening and closing direction of the medical clip, and a width direction of the medical clip; The medical clip is configured to connect to the clip connecting portion of the linear object at a proximal side in a longitudinal direction of the medical clip and to grip the object at a distal side in the longitudinal direction, A connection portion that connects the first portion and the second portion is disposed on a first end side in a width direction of the medical clip, The clip system for an endoscope according to any one of claims 1 to 8, wherein the connection portion is disposed proximally relative to a midpoint of the longitudinal length of the medical clip.

10. The medical clip further includes a cylindrical fastening ring disposed outside the first and second portions, The clip system for an endoscope according to any one of claims 1 to 9, wherein the fastening ring is movable in a longitudinal direction on the medical clip.

11. The linear object further has a pusher that is movable in a longitudinal direction, The clip system for an endoscope according to claim 10, wherein a distal end of the pusher is configured to contact a proximal end of the fastening ring to move the fastening ring distally.

12. The clip system for an endoscope according to any one of claims 1 to 11, wherein the clip connecting portion has a contact portion that contacts a proximal end of the medical clip.

13. the medical clip further includes a first claw portion at a proximal end of the first portion and extending toward the second portion, and a second claw portion at a proximal end of the second portion and extending toward the first portion; The clip system for an endoscope according to any one of claims 1 to 12, wherein the first claw portion and the second claw portion have a notch along an outer periphery of the linear object.

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