Medical devices

Abstract

To improve the shape memory properties of medical devices. [Solution] The medical device comprises a long main body and a reading section connected to the tip of the main body, the reading section having a rod that enters the lesion. The tip of the main body extends in a first direction. The tip of the rod extends in a second direction different from the first direction.

Description

Technical Field

[0001] The technology disclosed in the present specification relates to a medical device.

Background Art

[0002] A known medical device comprises an elongated portion including a shaft, a coil, and the like, and a probe extending distally from a distal end of the elongated portion. The elongated portion is bent (see, for example, Patent Document 1).

Prior Art Literature

Patent Literature

[0003]

Patent Document 1

Summary of the Invention

Problem to be Solved by the Invention

[0004] When the above medical device receives an external force in a biological lumen such as a blood vessel, it easily deforms from the shape before receiving the external force. That is, the above medical device has low shape memory property.

[0005] The present specification discloses a technology capable of solving the above-described problems.

Means for Solving the Problem

[0006] The technology disclosed in the present specification can be implemented, for example, in the following forms.

[0007] The medical device disclosed in the present specification comprises: an elongated main body portion; and a leading portion connected to a distal end of the main body portion, the leading portion having a rod that enters a lesion. A distal end portion of the main body portion extends in a first direction. A distal end portion of the rod extends in a second direction different from the first direction.

Brief Description of the Drawings

[0008] [Figure 1] This diagram schematically shows the configuration of the guide wire in the first embodiment. [Figure 2] This diagram schematically shows the configuration of the guide wire in the first embodiment. [Figure 3] This diagram schematically shows the configuration of the guide wire in the first embodiment. [Figure 4] This diagram schematically shows the configuration of the guide wire in the first embodiment. [Figure 5] This diagram schematically shows the configuration of the guide wire in the first embodiment. [Figure 6] A flowchart illustrating an example of a treatment method using a guidewire. [Figure 7] An explanatory diagram showing an example of a treatment method using a guidewire. [Figure 8] An explanatory diagram showing an example of a treatment method using a guidewire. [Figure 9] This is an explanatory diagram illustrating the configuration of the guide wire in the second embodiment. [Figure 10] This is an explanatory diagram illustrating the configuration of the guide wire in the third embodiment. [Figure 11] This diagram schematically shows the configuration of the guide wire in the first modified example. [Figure 12] This diagram schematically shows the guide wire configuration of the second modified example. [Figure 13] This diagram schematically shows the configuration of the guide wire in the third modified example. [Figure 14] This diagram schematically shows the guide wire configuration of the fourth modified example. [Modes for carrying out the invention]

[0009] (First Embodiment) Figures 1 to 5 are schematic diagrams illustrating the configuration of the guidewire 100 in the first embodiment. Each figure shows mutually orthogonal XYZ axes for specifying direction. Figure 1 shows the appearance of the guidewire 100 in the X-axis direction view. Figure 2 shows the appearance of the guidewire 100 in the Y-axis direction view. Figure 3 shows the YZ longitudinal section of the guidewire 100. Figure 4 shows the YZ longitudinal section of the tip of the guidewire 100. Figure 5 shows the cross-section CS of the core shaft 40, described later, at position VV in Figure 4. In the guidewire 100, the positive Z-axis side is the tip side (distal side) that is inserted into the body. In the guidewire 100, the negative Z-axis side is the proximal end (proximal side) that is manipulated by the surgeon. In each figure, some parts of the guidewire 100 may be omitted from the illustration. Figures 1 to 4 show the guidewire 100 in a straight line parallel to the Z-axis. The guide wire 100 has enough flexibility to bend.

[0010] In this specification, for the guide wire 100 and its components, the tip end is referred to as the "tip," the tip and its vicinity as the "tip portion," the base end is referred to as the "base end," and the base end and its vicinity as the "base end portion." The cross-section of the guide wire 100 and its components means a cross-section perpendicular to the longitudinal direction. The longitudinal section of the guide wire 100 and its components means a cross-section parallel to the central axis in the longitudinal direction. For the guide wire 100 and its components, the direction perpendicular to the longitudinal direction is referred to as the "radial direction." The outer diameter of the guide wire 100 and its components means the width along the radial direction.

[0011] The guidewire 100 is a long medical device inserted into the lumen of a living body, such as a blood vessel. The total length of the guidewire 100 is, for example, between 1000 mm and 3000 mm. The guidewire 100 is an example of a medical device.

[0012] The guide wire 100 comprises a main body 10 and a leading section 20.

[0013] The main body portion 10 is an elongated portion extending along the central axis Ax. The proximal end 15 of the main body portion 10 coincides with the proximal end of the guide wire 100. A helical groove 18 is formed on the outer circumferential surface 17 of the distal end portion of the main body portion 10. The distal end portion of the main body portion 10 extends in the first direction DR1. The first direction DR1 is a direction parallel to the Z-axis direction.

[0014] The leading portion 20 is connected to the distal end 16 of the main body portion 10. A proximal end 27 of the leading portion 20 is connected to the distal end 16 of the main body portion 10. The leading portion 20 has a rod 21 that enters a lesion. The leading portion 20 can be expressed as a leading part, a drill part, a crushing part, a peeling part, an entering part, a peeler, a shaver, or the like. A distal end 22 of the rod 21 coincides with a distal end 23 of the leading portion 20. The distal end 22 of the rod 21 coincides with the distal end of the guide wire 100. The distal end 23 of the leading portion 20 is a flat plane parallel to a direction perpendicular to the longitudinal direction of the leading portion 20 (the second direction DR2). The distal end 22 of the rod 21 is a flat plane parallel to a direction perpendicular to the longitudinal direction of the rod 21 (the second direction DR2). The leading portion 20 enters the lesion while rotating around the central axis Ax of the main body portion 10. The entry of the leading portion 20 into the lesion can be expressed as crossing through the lesion, drilling the lesion, peeling the lesion, separating the lesion, entering the lesion, or the like.

[0015] The rod 21 in the leading portion 20 extends linearly. A distal end portion of the rod 21 extends in a second direction DR2. The second direction DR2 is a direction parallel to the YZ plane and intersecting each of the Z-axis direction and the Y-axis direction. The second direction DR2 is a direction inclined at a predetermined angle with respect to the first direction DR1. The predetermined angle is, for example, not less than 10 degrees and not more than 70 degrees. The predetermined angle may be not less than 15 degrees and not more than 60 degrees, or may be not less than 30 degrees and not more than 50 degrees. An outer diameter of a cross-section of the rod 21 in the leading portion 20 is smaller than an outer diameter of a cross-section of the main body portion 10. A length L20 of the leading portion 20 along the Z-axis direction is, for example, not less than 0.2 mm and not more than 2.0 mm. The length L20 of the leading portion 20 may be not less than 0.3 mm and not more than 1.5 mm, or may be not less than 0.4 mm and not more than 1.0 mm.

[0016] As shown in FIG. 4, in a radial direction of the guide wire 100, a distal end 22 of the rod 21 is located at the same position as an outer peripheral surface 17 of the main body portion 10. When a trajectory traced by the distal end 22 of the rod 21 in a case where the guide wire 100 is rotated around the central axis Ax is defined as a virtual circle VC, a diameter D2 of the virtual circle VC is equal to a diameter D1 of the main body portion 10. Specifically, the diameter D1 is a diameter of the main body portion 10 at a distal end 16 of the main body portion 10.

[0017] As shown in FIG. 3, the guide wire 100 includes a core shaft 40, a first coil 50, and a second coil 60.

[0018] The core shaft 40 is a linear member. A part of the core shaft 40 is covered by each of the first coil 50 and the second coil 60. The core shaft 40 includes a first portion 40A and a second portion 40B. FIG. 4 shows a boundary position BP between the first portion 40A and the second portion 40B. The boundary position BP is a distal end of the first portion 40A and a proximal end of the second portion 40B. The main body portion 10 includes a part of the core shaft 40 on a proximal end side of the first portion 40A. The leading portion 20 includes a part of the core shaft 40 on a distal end side of the first portion 40A and the second portion 40B.

[0019] The first part 40A is a portion of the core shaft 40. The proximal end of the first part 40A is located at the proximal end of the main body 10. The proximal end of the first part 40A is the portion that is grasped by the operator. The first part 40A extends along a central axis Ax parallel to the Z-axis direction.

[0020] The first section 40A has a large diameter section 41, a first tapered section 42, an intermediate diameter section 43, a second tapered section 44, and a small diameter section 45. The large diameter section 41, the first tapered section 42, the intermediate diameter section 43, the second tapered section 44, and the small diameter section 45 are arranged in this order from the base end to the tip end of the guide wire 100.

[0021] The large diameter section 41 is a rod-shaped portion having a substantially constant outer diameter. The outer diameter (maximum width) of the large diameter section 41 is, for example, approximately 0.2 mm or more and 3.0 mm or less. The first tapered section 42 is a portion where the outer diameter gradually decreases from the boundary with the large diameter section 41 toward the boundary with the intermediate diameter section 43. The intermediate diameter section 43 is a rod-shaped portion having a substantially constant outer diameter smaller than the outer diameter of the large diameter section 41. The second tapered section 44 is a portion where the outer diameter gradually decreases from the boundary with the intermediate diameter section 43 toward the boundary with the small diameter section 45. The small diameter section 45 is a rod-shaped portion having a substantially constant outer diameter smaller than the outer diameter of the intermediate diameter section 43. The small diameter section 45 is the tip of the first section 40A. The small diameter section 45 extends in the first direction DR1.

[0022] The second portion 40B is a portion of the core shaft 40 that is different from the first portion 40A. The second portion 40B is located closer to the tip than the first portion 40A. The base end of the second portion 40B is connected to the tip of the first portion 40A. The tip of the second portion 40B is located at the tip of the leading portion 20. The tip of the second portion 40B is a plane parallel to the direction perpendicular to the long axis direction (second direction DR2) of the second portion 40B. The second portion 40B extends linearly from the boundary position BP with the first portion 40A to the tip of the second portion 40B. The second portion 40B extends in the second direction DR2. In the radial direction of the guide wire 100, the tip of the second portion 40B is in the same position as the outer circumferential surface 52 of the first coil 50. As shown in Figure 5, the cross-section CS of the second portion 40B in the core shaft 40 is flattened.

[0023] For example, metal can be used as the material for forming the core shaft 40. More specifically, stainless steel (SUS302, SUS304, SUS316, etc.), Ni-Ti alloy, piano wire, etc., can be used. The core shaft 40 may be formed entirely from the same material, or each part may be formed from different materials.

[0024] The first coil 50 is a cylindrical member in which one or more wires are wound in a spiral shape. The main body 10 includes the first coil 50. The first coil 50 covers the core shaft 40. The outer diameter of the first coil 50 is, for example, 0.1 mm or more and 0.6 mm or less. The outer diameter of the first coil 50 may be 0.2 mm or more and 0.5 mm or less, or 0.3 mm or more and 0.4 mm or less. The outer diameter of the first coil 50 may be 1.00 mm or more and 2.00 mm or less, or 1.10 mm or more and 1.65 mm or less, or 1.20 mm or more and 1.35 mm or less. In this embodiment, the outer diameter of the first coil 50 is constant along the entire length of the first coil 50. A spiral groove 53 is formed on the outer circumferential surface 52 of the first coil 50. Due to the presence of the spiral groove 53, a spiral groove 18 is formed on the outer circumferential surface 17 of the main body 10. The tip 51 of the first coil 50 coincides with the tip 16 of the main body 10. The first coil 50 is an example of a cylindrical body.

[0025] The second coil 60 is a cylindrical member in which one or more wires are wound in a spiral. The main body 10 includes the second coil 60. The second coil 60 is located between the core shaft 40 and the first coil 50 in the radial direction of the main body 10. The second coil 60 covers the core shaft 40. The tip of the second coil 60 covers the tip of the portion of the core shaft 40 included in the main body 10. The inner diameter of the second coil 60 is larger than the outer diameter of the portion of the core shaft 40 covered by the second coil 60. The second coil 60 is covered by the first coil 50. The outer diameter of the second coil 60 is smaller than the inner diameter of the first coil 50.

[0026] For example, metals can be used as the materials for forming the first coil 50 and the second coil 60. More specifically, radiotransparent materials such as stainless steel (SUS302, SUS304, SUS316, etc.), Ni-Ti alloys, and piano wire, or radiopaque materials such as platinum, gold, tungsten, and any of these alloys can be used. The first coil 50 and the second coil 60 may be formed from the same material or from different materials. Each of the first coil 50 and the second coil 60 may be formed entirely from the same material or from different materials in parts.

[0027] The first coil 50 and the second coil 60 are joined to the core shaft 40 via a tip-side joining member 71 formed at the tip of the first coil 50 and the second coil 60, and a base-side joining member 72 formed at the base end of the first coil 50 and the second coil 60. The tip-side joining member 71 protrudes from the tip 51 of the first coil 50 toward the tip. The first portion 40A of the core shaft 40 is connected to the first coil 50 and the second coil 60, respectively, via the portion of the tip-side joining member 71 that protrudes from the tip 51 of the first coil 50. In the longitudinal direction of the guide wire 100, the base end of the second portion 40B is located toward the tip of the core shaft 40 than the joint CP with the first coil 50. The joint CP is a part of the core shaft 40, and is the section to which the tip-side joining member 71 is attached to the core shaft 40. The boundary position BP between the first part 40A and the second part 40B is located on the tip side of the guide wire 100, relative to the tip-side joining material 71. Examples of materials used to form the tip-side joining material 71 and the base-side joining material 72 include metal solder (Au-Sn alloy, Sn-Ag alloy, Sn-Pb alloy, Pb-Ag alloy, etc.), brazing material (aluminum alloy brazing, silver brazing, gold brazing, etc.), and adhesive (epoxy adhesive, etc.).

[0028] The leading portion 20 has a reinforcing portion 28 located at the connection point with the main body portion 10. The reinforcing portion 28 reinforces the connection point between the leading portion 20 and the main body portion 10. In this embodiment, the reinforcing portion 28 is formed from the portion of the tip-side joining material 71 that protrudes from the tip 51 of the first coil 50 toward the tip side. The reinforcing portion 28 may also be formed by the welded portion between the leading portion 20 and the main body portion 10.

[0029] Figure 6 is a flowchart showing an example of a treatment method using a guidewire 100. Figures 7 and 8 are explanatory diagrams showing an example of a treatment method using a guidewire 100. As shown in Figures 7 and 8, in the treatment method using a guidewire 100, the operator inserts the leading portion 20 of the guidewire 100 into the lesion 220 within the blood vessel 200. The lesion 220 is, for example, a highly calcified lesion. The lesion 220 is, for example, a chronic total occlusion lesion. The length L0 of the lesion 220 along the extension direction of the blood vessel 200 is, for example, 100 mm or more and 500 mm or less. The length L0 of the lesion 220 may be 150 mm or more and 450 mm or less, or 200 mm or more and 400 mm or less.

[0030] First, the surgeon inserts a lead guidewire into the blood vessel 200 (S110). Unlike the guidewire 100 in this embodiment, the lead guidewire is a known guidewire that does not have a leading portion 20. The lead guidewire is also called a workhorse guidewire or first-choice guidewire. The surgeon inserts the lead guidewire into the blood vessel 200 through a sheath placed at an arbitrary position on the patient's body surface. The surgeon advances the lead guidewire to just before the lesion 220 in the blood vessel 200.

[0031] Next, the surgeon inserts the catheter 120 into the blood vessel 200 along the lead guidewire (S120). The surgeon advances the catheter 120 to just before the lesion 220 in the blood vessel 200 (see Figure 7).

[0032] Next, the surgeon withdraws the lead guidewire from the blood vessel 200 (S130). Then, the surgeon inserts the guidewire 100 into the catheter 120 inserted into the blood vessel 200, with the leading portion 20 at the front (S140, Figure 7). The surgeon advances the guidewire 100 to just before the lesion 220 in the blood vessel 200. When advancing the guidewire 100, the surgeon may or may not rotate the guidewire 100 around the central axis Ax.

[0033] Next, the surgeon advances the guidewire 100 toward the tip while rotating it, thereby causing the leading portion 20 of the guidewire 100 to enter the lesion 220 (S150, Figure 8). When the surgeon grasps the proximal end of the guidewire 100 and rotates the guidewire 100 around the central axis Ax, the leading portion 20 located at the tip of the guidewire 100 also rotates around the central axis Ax. The leading portion 20, rotating within the lesion 220, excavates by cutting through the lesion 220. When the leading portion 20 passes through the lesion 220, a through hole is formed in the lesion 220 with an inner diameter equal to the diameter D2 of the virtual circle VC. In this embodiment, in the guidewire advancement step (S150), the surgeon advances the leading portion 20 until it passes through the lesion 220. The guidewire 100 advancement step (S150) is performed while no other medical devices are passing over the lesion 220.

[0034] After the leading portion 20 of the guidewire 100 has passed the lesion 220, the operator advances a catheter (not shown) along the guidewire 100 to the position of the lesion 220. Then the operator withdraws the guidewire 100. When withdrawing the guidewire 100, the operator may or may not rotate the guidewire 100 around its central axis Ax.

[0035] Subsequently, the surgeon inserts a guidewire for an adjunct device (not shown) into the blood vessel 200 and advances it until the tip of the guidewire passes the lesion 220. The surgeon then advances the adjunct device to the location of the lesion 220, following the guidewire. The adjunct device may be, for example, an atherectomy device, a balloon catheter, or a stent.

[0036] As described above, the guide wire 100 of this embodiment comprises a long main body portion 10 and a leading portion 20 connected to the tip 16 of the main body portion 10, the leading portion 20 having a rod-shaped body 21 that enters the lesion portion 220. The tip of the main body portion 10 extends in a first direction DR1. The tip of the rod-shaped body 21 extends in a second direction DR2, which is different from the first direction DR1. With the guide wire 100 of this embodiment, since the guide wire 100 is bent at the tip side of the main body portion 10, the shape memory properties of the guide wire 100 are improved compared to, for example, a medical device in which the main body portion is bent.

[0037] In the guide wire 100 of this embodiment, the tip 22 of the rod 21 is at the same position as the outer circumferential surface 17 of the main body 10 in the radial direction of the guide wire 100. With the guide wire 100 of this embodiment, since the tip 22 of the rod 21 is at the same position as the outer circumferential surface 17 of the main body 10, the shape memory properties of the guide wire 100 are improved. With the guide wire 100 of this embodiment, since the tip 22 of the rod 21 is at the same position as the outer circumferential surface 17 of the main body 10, a through hole equal to the diameter D1 of the main body 10 can be formed in the lesion 220, and the passage of the guide wire 100 through the lesion 220 is improved. In other words, with the guide wire 100 of this embodiment, both shape memory properties and passage properties of the guide wire 100 are achieved.

[0038] In the guide wire 100 of this embodiment, the main body portion 10 is a first portion 40A which is part of the core shaft 40, and the tip of the first portion 40A extends in a first direction DR1, including the first portion 40A, and the leading portion 20 is a second portion 40B which is a part of the core shaft 40 different from the first portion 40A, and the second portion 40B is connected to the tip of the first portion 40A and extends in a second direction DR2, including the second portion 40B. According to the guide wire 100 of this embodiment, the shape memory properties of the guide wire 100 are improved.

[0039] In the guide wire 100 of this embodiment, the main body 10 further includes a first coil 50 that covers the core shaft 40 and is joined to the core shaft 40. According to the guide wire 100 of this embodiment, the torque transmission performance and durability of the guide wire 100 are improved.

[0040] In the guide wire 100 of this embodiment, in the longitudinal direction of the guide wire 100, the base end of the second portion 40B is located on the tip side of the joint CP with the first coil 50 on the core shaft 40. With the guide wire 100 of this embodiment, since the second portion 40B is not joined to the first coil 50, the angle between the extension direction of the main body portion 10 and the extension direction of the leading portion 20 is not easily fixed. For this reason, for example, when the guide wire 100 is used in combination with a combined device such as a catheter that covers the guide wire 100, strong contact between the leading portion 20 and the combined device is suppressed, and a decrease in sliding performance between the leading portion 20 and the combined device is suppressed.

[0041] In this embodiment, the guide wire 100 further includes a second coil 60 located between the core shaft 40 and the first coil 50 in the radial direction of the guide wire 100. According to this embodiment, the torque transmission performance and durability of the guide wire 100 are improved.

[0042] In the guide wire 100 of this embodiment, the cross-section CS of the second portion 40B is flattened. According to the guide wire 100 of this embodiment, the shape memory properties of the guide wire 100 are improved.

[0043] (Second Embodiment) Figure 9 is an explanatory diagram schematically showing the configuration of the guide wire 100a of the second embodiment. Figure 9 shows an enlarged view of the YZ longitudinal cross-section of the tip of the guide wire 100a. In the following, for components of the guide wire 100a of the second embodiment that are the same as those of the guide wire 100 of the first embodiment, the same reference numerals are used, and their explanations will be omitted as appropriate.

[0044] In the guide wire 100a of this embodiment, the tip 22 of the rod 21a is located outside the outer circumferential surface 17 of the main body 10 in the radial direction of the guide wire 100a. When the guide wire 100a is rotated around the central axis Ax, the trajectory followed by the tip 22 of the rod 21a is defined as a virtual circle VCa, and the diameter D2a of the virtual circle VCa is greater than the diameter D1 of the main body 10. In the radial direction of the guide wire 100a, the tip of the second portion 40Ba of the core shaft 40a is located outside the outer circumferential surface of the first coil 50.

[0045] As described above, in the guide wire 100a of this embodiment, the tip 22 of the rod 21a is located outside the outer circumferential surface 17 of the main body 10 in the radial direction of the guide wire 100a. With the guide wire 100a of this embodiment, since the tip 22 of the rod 21a is located outside the outer circumferential surface 17 of the main body 10, a through hole larger than the diameter D1 of the main body 10 can be formed in the lesion 220, and the passage of the guide wire 100a through the lesion 220 is improved.

[0046] (Third embodiment) Figure 10 is an explanatory diagram schematically showing the configuration of the guide wire 100b of the third embodiment. Figure 10 shows an enlarged view of the YZ longitudinal cross-section of the tip of the guide wire 100b. In the following, for components of the guide wire 100b of the third embodiment that are the same as those of the guide wire 100 of the first embodiment, the same reference numerals are used, and their explanations will be omitted as appropriate.

[0047] In the guide wire 100b of this embodiment, the tip 22 of the rod 21b is located inside the outer circumferential surface 17 of the main body 10 in the radial direction of the guide wire 100b. When the guide wire 100b is rotated around the central axis Ax, the trajectory followed by the tip 22 of the rod 21b is taken as a virtual circle VCb, and the diameter D2b of the virtual circle VCb is smaller than the diameter D1 of the main body 10. In the radial direction of the guide wire 100b, the tip of the second portion 40Bb of the core shaft 40b is located inside the outer circumferential surface of the first coil 50.

[0048] As described above, in the guide wire 100b of this embodiment, the tip 22 of the rod 21b is located inside the outer circumferential surface 17 of the main body 10 in the radial direction of the guide wire 100b. With the guide wire 100b of this embodiment, since the tip 22 of the rod 21b is located inside the outer circumferential surface 17 of the main body 10, the shape memory properties of the guide wire 100b are improved.

[0049] (modified version) The technologies disclosed herein are not limited to the embodiments described above and can be modified in various forms without departing from their essence, for example, the following modifications are possible.

[0050] The configuration of the guide wire 100 in the above embodiment is merely an example and can be modified in various ways.

[0051] Figure 11 is an explanatory diagram schematically showing the configuration of the guide wire 100c of the first modified example. Figure 11 shows an enlarged view of the YZ longitudinal cross-section of the tip of the guide wire 100c. In the following, for the configuration of the guide wire 100c of the first modified example that is the same as that of the guide wire 100 of the first embodiment, the same reference numerals are used and their explanations are omitted as appropriate.

[0052] The guide wire 100c of this modified example comprises a core shaft 40c and a tip wire 47 instead of the core shaft 40 of the first embodiment. The main body 10 includes the core shaft 40c. The leading portion 20c includes the tip wire 47. The tip of the core shaft 40c is embedded in the tip-side connecting material 71. The base end of the tip wire 47 is embedded in the tip-side connecting material 71. The tip of the tip wire 47 coincides with the tip 22 of the rod body 21c. The tip wire 47 extends in the second direction DR2. In other words, in the guide wire 100c of this modified example, the portion corresponding to the first portion 40A and the portion corresponding to the second portion 40B of the first embodiment are separate. Thus, the leading portion may be a wire separate from the core shaft.

[0053] Figure 12 is an explanatory diagram schematically showing the configuration of the guide wire 100d of the second modified example. Figure 12 shows an enlarged view of the YZ longitudinal cross-section of the tip of the guide wire 100d. In the following, for the configuration of the guide wire 100d of the second modified example that is the same as that of the guide wire 100 of the first embodiment, the same reference numerals are used and their explanations are omitted as appropriate.

[0054] In this modified guidewire 100d, the rod 21d in the leading section 20d extends in a curved shape. The tip of the rod 21d extends in the second direction DR2d. The second section 40Bd of the core shaft 40d extends in a curved shape from the boundary position BP with the first section 40A to the tip of the second section 40Bd. The tip of the second section 40Bd extends in the second direction DR2d. Thus, the rod in the leading section may extend in a curved shape.

[0055] Figure 13 is an explanatory diagram schematically showing the configuration of the guide wire 100e of the third modified example. Figure 13 shows an enlarged view of the YZ longitudinal cross-section of the tip of the guide wire 100e. In the following, for the configuration of the guide wire 100e of the third modified example that is the same as that of the guide wire 100 of the first embodiment, the same reference numerals are used and their explanations will be omitted as appropriate.

[0056] In the modified guidewire 100e, the tip 23e of the leading portion 20e is curved. The tip 22 of the rod body 21e is curved. The tip of the second portion 40Be of the core shaft 40e is curved. Thus, the tip of the leading portion may be curved. The tip of the leading portion may have any shape. The tip of the leading portion may be a shape close to a cone, pointed at any position closer to the center than the outer circumferential surface of the leading portion. The tip of the leading portion may be a shape pointed at any position on the outer circumferential surface of the leading portion, and may have a plane extending obliquely with respect to the second direction DR2. The tip of the leading portion may have irregularities formed on its surface, for example. The tip of the leading portion may be spherical, for example.

[0057] Figure 14 is an explanatory diagram schematically showing the configuration of the guide wire 100f of the fourth modified example. Figure 14 shows an enlarged view of the YZ longitudinal cross-section of the tip of the guide wire 100f. In the following, for the configuration of the guide wire 100f of the fourth modified example that is the same as that of the guide wire 100 of the first embodiment, the same reference numerals are used and their explanations are omitted as appropriate.

[0058] In this modified guidewire 100f, the tip of the second coil 60f covers the tip of the second portion 40Bf of the core shaft 40f. In other words, the tip of the second coil 60f covers the tip of the portion included in the leading portion 20f of the core shaft 40f. The tip of the second coil 60f is joined to the tip of the core shaft 40f via a leading-edge joining material 73 formed further towards the tip than the tip-side joining material 71. The surface of the leading-edge joining material 73 facing the tip side is curved. The leading portion 20f includes the leading-edge joining material 73. The leading-edge joining material 73 is located at the tip 22f of the leading portion 20f. The tip 23f of the leading portion 20f is curved. Thus, the tip of the second coil may cover the tip of the portion included in the leading portion of the core shaft. The surface of the leading-edge joining material facing the tip side may be curved.

[0059] The second coil may be a stranded wire containing multiple strands.

[0060] In the longitudinal direction of the medical device, the proximal end of the second portion of the core shaft may be located at the joint with the cylindrical body in the core shaft, or it may be located on the proximal end side of the joint with the cylindrical body in the core shaft. In other words, the boundary between the first portion and the second portion of the core shaft may be embedded in the tip-side joint material, or it may be located on the proximal end side of the tip-side joint material.

[0061] Medical devices do not necessarily need to have a second coil.

[0062] The cross-section of the second portion of the core shaft does not have to be flattened; it may be any shape, such as circular.

[0063] The treatment method using the guide wire 100 in the above embodiment is merely one example and can be modified in various ways.

[0064] In the above embodiment, a guidewire 100 for treating lesions within blood vessels was used as an example. The techniques disclosed herein are similarly applicable to medical devices in general for treating lesions in biological tubular lumenes.

[0065] Each of the features described in each of the embodiments described above may be appropriately combined with other embodiments or modifications. Each of the features described in each of the modifications described above may be appropriately combined with embodiments or modifications. Each of the features described in each of the embodiments described above may be appropriately omitted. Each of the features described in each of the modifications described above may be appropriately omitted.

Claims

1. A medical device (100), A long main body (10), A reading section (20) connected to the tip (16) of the main body (10), the reading section (20) having a rod (21) that enters the lesion (220), Equipped with, The tip of the main body (10) extends in the first direction (DR1), The tip of the rod (21) is a medical device (100) that extends in a second direction (DR2) different from the first direction (DR1).

2. A medical device (100) according to claim 1, In the radial direction of the medical device (100), the tip (22) of the rod (21) is at the same position as the outer circumferential surface (17) of the main body (10).

3. A medical device (100a) according to claim 1, In the radial direction of the medical device (100a), the tip (22) of the rod (21a) is located outside the outer peripheral surface (17) of the main body (10).

4. A medical device (100b) according to claim 1, In the radial direction of the medical device (100b), the tip (22) of the rod (21b) is located inside the outer circumferential surface (17) of the main body (10).

5. A medical device (100) according to any one of claims 1 to 4, The main body (10) is a first portion (40A) which is part of the core shaft (40), and the tip of the first portion (40A) includes a first portion (40A) that extends in the first direction (DR1). The medical device (100) includes a second portion (40B) which is a part of the core shaft (40) that is different from the first portion (40A), and which is connected to the tip of the first portion (40A) and extends in the second direction (DR2).

6. A medical device (100) according to claim 5, The main body (10) further includes a cylindrical body (50) that covers the core shaft (40) and is joined to the core shaft (40), comprising a medical device (100).

7. A medical device (100) according to claim 6, In the longitudinal direction of the medical device (100), the base end of the second portion (40B) is located on the tip side of the joint (CP) between the core shaft (40) and the cylindrical body (50) of the medical device (100).

8. A medical device (100) according to claim 6 or claim 7, The cylindrical body (50) is the first coil (50), The medical device (100) further comprises a second coil (60) located between the core shaft (40) and the first coil (50) in the radial direction of the medical device (100).

9. A medical device (100) according to any one of claims 5 to 8, The cross-section (CS) of the second portion (40B) is flattened, medical device (100).

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