Vascular Model

Abstract

To provide a blood vessel model capable of evaluating selection performance of a medical long body for branch blood vessels having a plurality of continuous meandering parts.SOLUTION: A blood vessel model 10 simulating a blood vessel, has a main passageway 30 that simulates a main blood vessel; and a plurality of branch passages 40 that simulates branch blood vessels branching from the main blood vessel 30, and is narrower than the main passage 30. The plurality of branch passages 40 branch in a certain direction from the same main blood vessel 30. Each branch passage 40 meanders so as to have three or more crest parts 41a that are convex on one side and the other in a direction of branching from the main blood vessel 30.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a blood vessel model that simulates a blood vessel. [Background technology]

[0002] In recent years, interventions have been performed in which a medical elongated object such as a catheter or a guide wire is inserted into a blood vessel through the skin and reaches a target position through the blood vessel. Since interventions are performed through blood vessels that are complicatedly curved, the catheter is required to be able to reach the target position. For this reason, for example, Patent Document 1 describes a blood vessel model used to test the operability of a medical elongated object. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2001-343891 A Summary of the Invention [Problem to be solved by the invention]

[0004] In prostate artery embolization as a treatment for prostatic hyperplasia and liver artery embolization as a treatment for liver cancer, a thin branch blood vessel that branches off from a thick main blood vessel at an acute angle is selected with a microcatheter or guidewire, which can be difficult to select. In particular, when the main blood vessel is thick, the microcatheter is easily bent, making it difficult to enter the branch blood vessel, or even if it does enter, the tip of the microcatheter may come out. In addition, when the branch blood vessel forms an acute angle with the main blood vessel, the tip of the microcatheter is easily pulled out of the branch blood vessel, making selection even more difficult.

[0005] In arterial embolization of the prostate, the internal iliac artery, which is the main blood vessel, has an inner diameter of 2 to 8 mm, and the branch blood vessels have an inner diameter of about 1 mm. In arterial embolization of the liver, the main blood vessel has an inner diameter of 2 to 5 mm, and the branch blood vessels have an inner diameter of about 1 mm, and there may be further continuous branches. When the branch blood vessels have further continuous branches, it becomes even more difficult to select the branch blood vessels using a microcatheter or guidewire.

[0006] With the vascular model described in Patent Document 1, it is difficult to evaluate the selection performance of medical elongated objects such as microcatheters and guidewires in thin branch blood vessels that branch off at acute angles from a main blood vessel as described above.

[0007] In addition, a branch blood vessel may have multiple continuous meandering portions, and it is conceivable that a medical elongated object may be inserted into such a branch blood vessel. However, with the conventional blood vessel model, it is not possible to evaluate a branch blood vessel having such a continuous meandering portion.

[0008] The present invention has been made to solve the above-mentioned problems, and aims to provide a vascular model that can evaluate the selection performance of a medical elongated body toward a branched blood vessel having multiple continuous meandering sections. [Means for solving the problem]

[0009] The blood vessel model according to the present invention, which achieves the above object, is a blood vessel model simulating a blood vessel, and includes a main passage simulating a main blood vessel, and a plurality of branch passages simulating branch blood vessels branching off from the main blood vessel and narrower than the main passage, the plurality of branch passages branching off from the same main blood vessel in a certain direction, and each of the branch passages meanders so as to have three or more peaks that are convex on one side and the other side with respect to the branching direction from the main blood vessel. The plurality of peaks of the same branch passage are bent to have the same radius of curvature, and the plurality of branch passages have peaks each having a different radius of curvature. It is characterized by: Effect of the Invention

[0010] The blood vessel model constructed as described above can be used to evaluate the selection performance of a medical elongated object to a branched blood vessel having a plurality of successive meandering portions. Furthermore, the blood vessel model allows the degree of passability of medical elongated objects to be evaluated by using multiple paths with different radii of curvature.

[0012] The main passage may have a bent portion between the inlet and the branch passage closest to the inlet, whereby the medical elongated object can be inserted into the branch passage while being subjected to a bending load, thereby enabling performance evaluation to be performed under conditions close to those in an actual living body.

[0013] The medical elongate body may have a second main passage having a meandering portion that is convex on one side and a straight bypass passage that opens at the inlet side and the outlet side of the second main passage, respectively. This allows the performance of the medical elongate body to be evaluated by arbitrarily combining the meandering passage and the straight passage.

[0014] The medical elongate object may have a third main passage having a curved portion bent in one direction, an inner circumference side branch passage branching toward the inner circumference side of the curved portion, and an outer circumference side branch passage branching toward the outer circumference side of the curved portion. This makes it possible to evaluate the difference in torque required to advance the medical elongate object from the passage bent in one direction into the passages branching toward the inner circumference side and the outer circumference side.

[0015] The inner circumference side branch passage and the outer circumference side branch passage may be configured to meander so as to have convex mountain portions on one side and the other side in the branching direction from the curved portion, respectively, thereby making it possible to evaluate the passability of the medical elongated object when the passages branching from the curved portion to the inner circumference side and the outer circumference side, respectively, are meandering. [Brief description of the drawings]

[0016] [Figure 1] FIG. 2 is a plan view showing a blood vessel model according to the embodiment. [Diagram 2] FIG. 2 is a side view showing a blood vessel model according to the embodiment. [Diagram 3]2 is an enlarged view of the first main passage and the branch passage in FIG. 1, showing a state in which a medical elongated object has been inserted into the first branch passage. FIG. [Figure 4] 2 is an enlarged view of the vicinity of the second main passage in FIG. 1, showing a state in which an elongated medical object has been inserted into the second main passage. FIG. [Diagram 5] 2 is an enlarged view of the vicinity of the third main passage, the inner peripheral branch passage, and the outer peripheral branch passage in FIG. 1, showing a state in which a medical elongated object has been inserted into the inner peripheral branch passage. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that dimensions in the drawings may be exaggerated for convenience of explanation and may differ from actual dimensions. In addition, in this specification and the drawings, components having substantially the same functions are denoted by the same reference numerals, and duplicated explanations will be omitted.

[0018] The blood vessel model 10 according to this embodiment is a model that simulates a blood vessel in order to evaluate the selectivity of branched blood vessels of a medical elongated object such as a microcatheter, a guidewire, etc. The use of the blood vessel model 10 is not limited to the use for evaluating a medical elongated object, and may be used, for example, for training in procedures.

[0019] As shown in FIGS. 1 and 2, the blood vessel model 10 includes two split simulation parts 11, two holding plates 12 sandwiching the split simulation parts 11, a plurality of connectors 13, and an insertion port 14. The two split simulation parts 11 are substantially rectangular flat plates with grooves simulating blood vessels formed on the opposing surfaces 15. The two split simulation parts 11 are formed in a plane-symmetrical shape. Therefore, by overlapping on the opposing surfaces 15, the grooves overlap to form a blood vessel simulation part 20 simulating a blood vessel with a substantially circular cross section. The split simulation part 11 is preferably transparent or semi-transparent so that the inside can be visually observed, and is preferably formed of a flexible material similar to actual biological tissue. The constituent material of the split simulation part 11 is not particularly limited, and may be, for example, silicone resin, various elastomer resins such as SEBS, polyolefin elastomer, polyamide elastomer, acrylic elastomer, and fluorine-containing elastomer. In this embodiment, the constituent material of the split simulation part 11 is silicone resin. The divided simulation portion 11 is preferably formed using a mold, but the method of formation is not particularly limited, and it may be formed, for example, by a 3D printer.

[0020] The holding plate 12 is a member that sandwiches the two flexible division simulation parts 11 in order to hold the two flexible division simulation parts 11 in an overlapping state. Each holding plate 12 is a substantially rectangular flat plate that can cover the division simulation part 11. The holding plate 12 is preferably transparent or semi-transparent so that the inside can be visually observed, and is formed of a hard material that can hold the flexible division simulation part 11. The constituent material of the holding plate 12 is not particularly limited, and may be, for example, acrylic resin, ABS resin, acrylic resin, methacrylic resin, polycarbonate, melamine resin, styrene resin, hard polyvinyl chloride resin, fluororesin, glass, etc. In this embodiment, the constituent material of the holding plate 12 is acrylic resin.

[0021] The connector 13 is a member for holding the split simulation part 11 sandwiched between the holding plates 12. The connector 13 is composed of, for example, a bolt and a nut that can pass through through holes formed in the split simulation part 11 and the holding plates 12 and hold the two holding plates 12 together. The configuration of the connector 13 is not particularly limited, and may be, for example, a clamp or the like.

[0022] The insertion port 14 is a site for inserting the medical elongated body into the blood vessel model 10. The insertion port 14 is disposed on the side end faces of the two divided simulation parts 11 in communication with the grooves so as to be sandwiched between the opposing grooves. The insertion port 14 is configured, for example, with a hemostatic valve having a three-way stopcock or a Y connector, and is connected to a communication passage 21 (described later) of the blood vessel simulation part 20 as a site for inserting the medical elongated body. The insertion port 14 equipped with a hemostatic valve or the like may also be disposed on an opening other than the communication passage 21 on the side end faces of the two divided simulation parts 11. This makes it easy to fill the inside of the blood vessel simulation part 20 with liquid, and the state filled with liquid can be well maintained.

[0023] The blood vessel model 10 is a model having a substantially planar structure. The thickness of the blood vessel model 10 having a substantially planar structure is 100 mm or less, preferably 50 mm or less, and more preferably 30 mm or less.

[0024] Next, the blood vessel simulation section 20 formed in the divided simulation section 11 will be described in detail. First, the lower half of the blood vessel simulation section 20 will be described. As shown in Fig. 1, the blood vessel simulation section 20 includes a communication passage 21 to which the insertion port 14 is connected, a main passage 30 simulating a main blood vessel, a plurality of branch passages 40 simulating branch blood vessels branching off from the main blood vessel, and an auxiliary passage 50 for removing air when the inside of the blood vessel simulation section 20 is filled with liquid.

[0025] The main passage 30 has a first main passage 31 extending from the communication passage 21. As shown in Fig. 3, the first main passage 31 has a large-diameter linear large-diameter passage section 31a communicating with the communication passage 21, a bent passage section 31b bending in an S-shape at the peripheral side of the large-diameter passage section 31a, a straight passage section 31c communicating with the peripheral side of the bent passage section 31b and extending between the communication passage 21 and the end of the blood vessel simulation section 20, and an introduction passage section 31d branching from the straight passage section 31c and bending in an L-shape. The distal side means the side of the passage away from the insertion port 14 (the side in the direction of travel of the medical elongated body to be inserted).

[0026] The first main passage 31 extends from the communication passage 21, which is the inlet, toward the peripheral side in the order of the large diameter passage section 31a, the bent passage section 31b, the straight passage section 31c, and the introduction passage section 31d, and has a bent section 31e that bends multiple times. The introduction passage section 31d has three branch passages 40 that branch in a certain direction. The branch passage 40 has a first branch passage 41, a second branch passage 42, and a third branch passage 43 along the inlet side to the peripheral side. The first branch passage 41, the second branch passage 42, and the third branch passage 43 each have three or more peaks 41a, 41b, and 41c that are convex on one side and the other side with respect to the branching direction from the introduction passage section 31d, which is the main passage 30. The first branch passage 41, the second branch passage 42, and the third branch passage 43 are all connected to the auxiliary passage 50 on the peripheral side.

[0027] The multiple peaks 41a of the first branch passage 41 are all bent to have the same radius of curvature. The multiple peaks 42a of the second branch passage 42 are all bent to have the same radius of curvature. The multiple peaks 43a of the third branch passage 43 are all bent to have the same radius of curvature. The peaks 41a of the first branch passage 41 have a larger radius of curvature than the peaks 42a of the second branch passage 42, and the peaks 42a of the second branch passage 42 have a larger radius of curvature than the peaks 43a of the third branch passage 43. That is, the peaks 41a, 42a, 43a of the branch passages have different radii of curvature.

[0028] The first branch passage 41, the second branch passage 42, and the third branch passage 43 all branch off from a straight portion of the introduction passage portion 31d. Therefore, the bent portion 31e of the first main passage 31 is disposed between the communication passage 21, which is the inlet of the first main passage 31, and the first branch passage 41, which is closest to the communication passage 21.

[0029] The diameters of the respective passages are, for example, as follows: large diameter passage section 31a is 8 mm, bent passage section 31b is 6 mm, straight passage section 32c is 5 mm, introduction passage section 31c is 3 mm, first branch passage 41 is 2.5 mm, second branch passage 42 is 2 mm, and third branch passage 43 is 1.5 mm. The radius of curvature of peak 41a of first branch passage 41 is 5 mm, the radius of curvature of peak 42a of second branch passage 42 is 4 mm, and the radius of curvature of peak 43a of third branch passage 43 is 3 mm.

[0030] As shown in Fig. 4, the main passage 30 has a second main passage 32 extending from the large diameter passage portion 31a and the bent passage portion 31b of the first main passage 31. The second main passage 32 has a first serpentine passage portion 32a communicating with the large diameter passage portion 31a, a straight passage portion 32c communicating with the first serpentine passage portion 32a, and a second serpentine passage portion 32b communicating with the straight passage portion 32c. The first serpentine passage portion 32a branches off from the bent passage portion 31b at an angle of less than 90°. The second serpentine passage portion 32b branches off from the straight passage portion 32c at an angle of less than 90°. The second main passage 32 has a first bypass passage 32d that linearly connects the large diameter passage 31a and the distal side of the first serpentine passage 32a, and a second bypass passage 32e that linearly connects the inlet side and the distal side of the second serpentine passage 32b. The first bypass passage 32d opens to the inlet side of the second main passage 32, and the second bypass passage 32e opens to the outlet side of the second main passage 32.

[0031] The diameters of the respective passages are, for example, as follows: first meandering passage portion 32a is 3 to 5 mm, straight passage portion 32c is 3 to 4 mm, second meandering passage portion 32b is 3 mm, first bypass passage portion 32d is 4 mm, and second bypass passage portion 32e is 3 mm.

[0032] 5, the main passage 30 has a third main passage 33 extending from the distal side of the second main passage 32. The third main passage 33 has a curved portion 33a that bends in a clockwise direction as viewed from the front from the distal end of the second main passage 32 toward the distal side. From the curved portion 33a, an inner circumference side branch passage 44 branches out toward the inner circumference side, and an outer circumference side branch passage 45 branches out toward the outer circumference side.

[0033] The inner branch passage 44 has a plurality of peaks 44a that are convex on one side and the other side in the branching direction from the curved portion 33a. The outer branch passage 45 has a plurality of peaks 45a that are convex on one side and the other side in the branching direction from the curved portion 33a.

[0034] The diameters of the passages are, for example, as follows: curved portion 33a is 3 mm, and the inner circumference side branch passage 44 and the outer circumference side branch passage 45 are 2 mm. The radius of curvature of peak portion 44a of inner circumference side branch passage 44 and peak portion 45a of outer circumference side branch passage 45 is 2.75 mm.

[0035] Next, the upper half of the blood vessel simulation section 20 will be described. As shown in Fig. 1, the upper half of the blood vessel simulation section 20 also has a main passage 60 and a branch passage 70. The main passage 60 has a fourth main passage 61 extending from the communication passage 21, and a fifth main passage 62 branching from the fourth main passage 61. The fourth main passage 61 extends linearly from the communication passage 21.

[0036] The fifth main passage 62 is a passage that branches off at a predetermined branching angle from the fourth main passage 61. The fifth main passage 62 extends linearly from the fourth main passage 61.

[0037] A plurality of branch passages 70 are connected to the fourth main passage 61 and the fifth main passage 62, and are arranged in the extending direction of the main passage 60 and branch off from the main passage 60 at different branching angles.

[0038] Next, a method for evaluating a medical elongated object using the blood vessel model 10 according to this embodiment will be described.

[0039] First, a tester performing the evaluation test determines the main passage 30 and the branch passage 40 into which the medical elongated body is to be inserted. For example, the tester determines that the medical elongated body 100 is to be inserted from the first main passage 31 to the first branch passage 41, as shown in Fig. 3. In this example, the medical elongated body 100 is a guidewire.

[0040] The tester injects water, saline, an aqueous solution containing a surfactant, or the like into the blood vessel model 10 through the insertion port 14. As a result, water, saline, an aqueous solution containing a surfactant, or the like flows into the inside of the blood vessel simulation part 20 of the blood vessel model 10. The air inside the blood vessel model 10 is discharged to the outside through an opening formed on the side end face of the blood vessel simulation part 20, an auxiliary passage 50, or the like. As a result, the inside of the blood vessel simulation part 20 of the blood vessel model 10 is filled with water, saline, an aqueous solution containing a surfactant, or the like. Alternatively, a surfactant or a lubricating polymer may be applied to the inner surface of the blood vessel simulation part 20 in advance, or a hydrophilic lubricating polymer containing acrylamide or a hydrophobic lubricating polymer such as a fluororesin may be applied as the lubricating polymer.

[0041] Next, the tester inserts the medical elongated body 100 from the insertion port 14 communicating with the communication passage 21, and causes the tip to reach the large diameter passage section 31a of the first main passage 31. Next, the tester causes the tip of the medical elongated body 100 to enter the introduction passage section 31d from the large diameter passage section 31a through the bent passage section 31b and the straight passage section 31c. Since the passage is bent in an S-shape from the bent passage section 31b to the introduction passage section 31d, a bending load can be applied to the medical elongated body 100 when the medical elongated body 100 enters the branch passage 40. This makes it possible to test the medical elongated body 100 under conditions close to those in an actual living body.

[0042] Next, the tester selects the first branch passage 41 with the tip of the medical elongated body 100 and attempts to push the medical elongated body 100 into the first branch passage 41. This allows the tester to evaluate, using the blood vessel model 10, whether or not the medical elongated body 100 has been able to select the first branch passage 41 from the first main passage 31.

[0043] The branch passage 40 has a second branch passage 42 and a third branch passage 43 in addition to the first branch passage 41, so the tester can select any one of these branch passages 40. The peak portion 42a of the second branch passage 42 has a smaller radius of curvature than the peak portion 41a of the first branch passage 41, so it is more difficult to pass the medical elongated body 100 through it. In addition, the peak portion 43a of the third branch passage 43 has a smaller radius of curvature than the peak portion 42a of the second branch passage 42, so it is even more difficult to pass the medical elongated body 100 through it. The tester can evaluate the passability of the medical elongated body 100 through the meandering portion by sequentially selecting the first branch passage 41, the second branch passage 42, and the third branch passage 43 and attempting to insert the medical elongated body 100 through them. In addition, since the medical elongated body 100 is already meandering in the first main passage 31 before the branch passage 40, the passability when entering a tortuous branch blood vessel from a tortuous main blood vessel can be appropriately evaluated.

[0044] Next, a case will be described where the tester selects the second main passage 32. In this example, the medical elongated body 100 is a catheter. As shown in Fig. 4, the tester inserts a guiding catheter (not shown) from the insertion port 14 communicating with the communication passage 21, and brings the tip of the guiding catheter into the large diameter passage portion 31a of the first main passage 31, and then inserts the medical elongated body 100 into the catheter, and brings the tip of the guiding catheter from the communication passage 21 to the entrance of the first serpentine passage portion 32a.

[0045] Next, the tester attempts to move the tip of the medical elongated body 100 from the first serpentine passage portion 32a into the straight passage portion 32c. After moving the tip of the medical elongated body 100 to the distal side of the straight passage portion 32c, the tester attempts to move the tip of the medical elongated body 100 into the second serpentine passage portion 32b. This makes it possible to perform a passability evaluation of the medical elongated body 100 for a pattern that combines a serpentine portion and a straight portion.

[0046] If the medical elongated body 100 buckles in the first serpentine passage section 32a and entry is difficult, the tester may attempt to guide the medical elongated body 100 from the large diameter passage section 31a through the first bypass passage section 32d to the straight passage section 32c, and then enter the medical elongated body 100 from the straight passage section 32c into the second serpentine passage section 32b. In this way, the combination of serpentine sections and straight sections may be changed according to the need for the test and the skill of the tester, allowing the test to be performed flexibly.

[0047] Next, a case where the tester selects the third main passage 33 will be described. In this example, the medical elongated body 100 is a catheter. In this case, either the inner circumference side branch passage 44 or the outer circumference side branch passage 45 branching off from the third main passage 33 can be selected. In this example, it is assumed that the tester selects the inner circumference side branch passage 44. The tester inserts a guiding catheter (not shown) from the insertion port 14 communicating with the communication passage 21, and reaches the tip of the guiding catheter to the large diameter passage portion 31a of the first main passage 31, and inserts the medical elongated body 100 into the catheter, passing through the communication passage 21, the first bypass passage portion 32d, the straight passage portion 32c, and the second bypass passage portion 32e, and reaches the entrance of the third main passage 33.

[0048] 5, the tester attempts to insert the tip of the medical elongated body 100 from the curved portion 33a of the third main passage 33 into the inner circumference side branch passage 44. Since the inner circumference side branch passage 44 is formed in a serpentine shape having multiple peaks 44a, the tester can evaluate the passability of the path that curves from the curved portion 33a, which bends in one direction, to the inner circumference side and then becomes serpentine.

[0049] When the tester selects the outer periphery branch passage 45, the tester attempts to insert the tip of the medical elongated body 100 into the outer periphery branch passage 45 from the curved portion 33a of the third main passage 33. Since the outer periphery branch passage 45 is formed in a serpentine shape having multiple peaks 45a, the tester can evaluate the passability of the path that curves from the curved portion 33a, which bends in one direction, to the outer periphery and then becomes serpentine.

[0050] When the medical elongated body 100 passes through a branch from the curved section 33a that bends in one direction, the torque required on the inner circumference side differs from that on the outer circumference side. Therefore, by being able to evaluate both the inner circumference side branch passage 44 and the outer circumference side branch passage 45, an appropriate evaluation of the medical elongated body 100 can be performed.

[0051] The method for evaluating a medical elongated object may be carried out in combination with a catheter and a guidewire.

[0052] The blood vessel model 10 may be used upside down. For this reason, the large diameter passage portion 31a simulating the aorta is formed to be symmetrical up and down. In addition, assuming that the liver is on the left side as seen from the tester, the medical elongated body 100 can be inserted from any of the insertion ports 14 connected to the communication passage 21. In the state of FIG. 1, when the medical elongated body 100 is inserted from the upper insertion port 14, a radial approach can be simulated, and when the medical elongated body 100 is inserted from the lower insertion port 14, a femoral approach can be simulated. Alternatively, the blood vessel model 10 may be used upside down. For example, even when the medical elongated body 100 is inserted from the upper insertion port 14 to simulate a radial approach, by inverting the blood vessel model 10 upside down in advance, the insertion angle of the medical elongated body 100 with respect to the auxiliary passage 50, for example, changes, so that the blood vessel branching angle, which varies among individuals in actual clinical practice, can be simulated.

[0053] As described above, the blood vessel model 10 according to this embodiment is a blood vessel model 10 that simulates a blood vessel, and has a main passage 30 that simulates a main blood vessel, and a plurality of branch passages 40 that are narrower than the main passage 30 and simulate branch blood vessels branching from the main blood vessel 30, and the plurality of branch passages 40 branch off in a certain direction from the same main blood vessel 30, and each of the branch passages 40 meanders to have three or more peaks 41a that are convex on one side and the other side with respect to the branching direction from the main blood vessel 30. The blood vessel model 10 configured in this manner can evaluate the selection performance of the medical elongated body 100 to a branch blood vessel having a plurality of continuous meandering portions.

[0054] Furthermore, the multiple peaks 41a of the same branch passage 40 may be bent to have the same radius of curvature, and the multiple branch passages 40 may have the peaks 41a, 42a, 43a each having a different radius of curvature. This makes it possible to evaluate the degree of passability of the medical elongated body 100 by using multiple paths with different radii of curvature.

[0055] Furthermore, the main passage 30 may have a bent portion 31e between the entrance and the branch passage 41 closest to the entrance. This allows the medical elongated object to enter the branch passage 41 while a bending load is applied, making it possible to perform performance evaluation under conditions close to those in an actual living body.

[0056] Also, the second main passage 32 may have a meandering portion that is convex on one side and the other side, and linear bypass passages 32d, 32e that open to and communicate with the inlet and outlet sides, respectively, of the second main passage 32. This allows performance evaluation of the medical elongated body 100 to be performed by arbitrarily combining meandering passages and linear passages.

[0057] Also, the third main passage 33 may have a curved portion 33a that bends in one direction, an inner circumference side branch passage 44 that branches off toward the inner circumference side of the curved portion 33a, and an outer circumference side branch passage 45 that branches off toward the outer circumference side of the curved portion 33a. This makes it possible to evaluate the difference in torque required to advance the medical elongated body 100 from the passage bent in one direction into the passages that branch off to the inner circumference side and the outer circumference side, respectively.

[0058] Furthermore, the inner circumference side branch passage 44 and the outer circumference side branch passage 45 may be made to meander so as to have peaks 44a, 45a that are convex on one side and the other side with respect to the branching direction from the curved portion 33a, respectively. This makes it possible to evaluate the passability of the medical elongated body 100 when the passages branching off from the curved portion 33a to the inner circumference side and the outer circumference side, respectively, are meandering.

[0059] The present invention is not limited to the above-mentioned embodiment, and various modifications can be made by those skilled in the art within the technical concept of the present invention. In the blood vessel model 10, the arrangement, diameter, curvature radius, etc. of each branch passage can be set arbitrarily as necessary. In addition, the direction in which the branch passage faces may be inverted upside down. [Explanation of symbols]

[0060] 10 Vascular Model 11 Split simulation part 12 Holding plate 13 Connectors 14 Insertion port 15 Opposite Surface 20 Blood vessel simulation section 21 Connecting Passage 30 Main aisle 31 1st main passage 31a Large diameter passage 31b Bent passage section 31c Straight passage section 31d Introduction passage section 31e Bend part 32 2nd main passage 32a First serpentine passage 32b Second serpentine passage 32c Straight passage section 32d First bypass passage 32e Second bypass passage 33 Third main passage 33a Curve section 40 Branch Passage 41 First Branch Passage 41a Yamabe 42 Second Branch Passage 42a Mountain 43 Third Branch Passage 43a Yamabe 44 Inner periphery branch passage 44a Yamabe 45 Outer periphery branch passage 45a Mountain 50 Auxiliary passage 100 Medical long body

Claims

1. A blood vessel model simulating a blood vessel, The device has a main passageway simulating a main blood vessel, and a plurality of branch passageways simulating branch blood vessels branching from the main blood vessel and narrower than the main passageway, The plurality of branch passages branch off from the same main passage in a certain direction, each of the branch passages meanders to have three or more peaks that are convex on one side and on the other side with respect to a branching direction from the main passage; the plurality of peaks of the same branch passage are bent to have the same radius of curvature, The blood vessel model has a plurality of branch passages, each of whose peaks has a different radius of curvature.

2. 2. The blood vessel model according to claim 1, wherein the main passage has a bend between an inlet and the branch passage closest to the inlet.

3. a second main passage having a meandering portion that is convex on one side and a meandering portion on the other side; 3. The blood vessel model according to claim 1, further comprising a linear bypass passage that opens to and communicates with an inlet side and an outlet side of the second main passage, respectively.

4. a third main passage having a curved portion that bends in one direction; an inner periphery side branch passage branching toward an inner periphery side of the curved portion; 4. The blood vessel model according to claim 1, further comprising: an outer periphery branch passage that branches out toward an outer periphery of the curved portion.

5. 5. The blood vessel model according to claim 4, wherein the inner circumference side branch passage and the outer circumference side branch passage are meandering so as to have convex mountain portions on one side and the other side in a branching direction from the curved portion.

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