Methods for inserting medical devices and medical elongated objects into blood vessels

Abstract

This invention provides a medical device for inserting a combination of a dilator, which has a changeable diameter and is easily removable from a medical-grade elongated body, and a medical-grade elongated body into a blood vessel, and a method for inserting a medical-grade elongated body into a blood vessel using the same. [Solution] The medical device 10 comprises a tubular section 21 formed by winding a thin film sheet 20 to create a lumen through which a long medical body 100 is inserted, and a hub 30 having an inner space 31 that communicates with the lumen 22 and a slit section 32 that connects the inner space 31 to the outside. The sheet 20 forming the tubular section 21 has two circumferentially discontinuous ends 20a and 20b that extend along the axial direction of the tubular section 21, one end 20a of the wound sheet 20 overlaps with the surface of the other end 20b of the sheet 20, and the slit section 32 of the hub 30 is located in a circumferential position that does not overlap with the sheet 20 when it is unfolded.

Description

Technical Field

[0001] The present invention relates to a medical device used when inserting a long medical body into a blood vessel and a method for inserting a long medical body into a blood vessel using this medical device.

Background Art

[0002] ECMO (ExtraCorporeal Membrane Oxygenation) is one of the effective treatment methods in life-saving treatment for resuscitating patients with cardiac arrest. When using ECMO, a cannula, which is a tubular long medical body, is inserted into a blood vessel. The cannula is required to have little resistance when inserted into the blood vessel, be easy to secure the blood vessel, and be difficult to come out after indwelling.

[0003] In order to give rigidity to the cannula to make it easier to insert into the blood vessel, a dilator is inserted into the cannula when inserting it into the blood vessel. The dilator is inserted into the blood vessel with its tip exposed on the tip side of the tip of the cannula. Further, the dilator is not limited to the cannula for ECMO, and is widely used when inserting a long medical body such as a catheter into a blood vessel.

[0004] For example, Patent Document 1 shows an introducer sheath formed from a sheath tube, which is a tubular member having a hollow portion through which a long body such as a catheter can be inserted.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in the sheath described in Patent Document 1, the diameter of the sheath tube is predetermined, making it impossible to accommodate medical long instruments with different outer diameters. This necessitated the preparation of multiple sheaths for each size. Therefore, when introducing multiple medical long instruments into a blood vessel, it was necessary to prepare a sheath each time and replace the sheath for each medical long instrument.

[0007] The present invention was made to solve the above-mentioned problems, and aims to provide a medical device for inserting a combination of a dilator, which has a changeable diameter and can be easily removed from a medical elongated body, and a medical elongated body into a blood vessel, and a method for inserting a medical elongated body into a blood vessel using the same. [Means for solving the problem]

[0008] The (1) medical device according to the present invention, which achieves the above objective, is a medical device through which a long medical body can be inserted, comprising: a tubular portion formed by winding a thin film sheet to create a lumen through which the long medical body can be inserted; and a hub having an inner space communicating with the lumen and a slit portion that connects the inner space to the outside, wherein the sheet forming the tubular portion has both ends that are discontinuous in the circumferential direction and each extends along the axial direction of the tubular portion, and one end of the wound sheet overlaps the surface of the other end of the sheet.

[0009] A method for inserting a medical elongated body into a blood vessel according to the present invention, which achieves the above objective, includes the steps of: preparing a medical device comprising: a tubular portion having a lumen formed by winding a thin film sheet; a hub having an inner space communicating with the lumen and a slit portion communicating the inner space with the outside; and a medical elongated body; introducing the tubular portion into a blood vessel; inserting the medical elongated body into the lumen of the tubular portion from the inner space of the hub, thereby inserting the medical elongated body into the blood vessel; and removing the tubular portion from the blood vessel, spreading the sheet to form a gap between both ends that is continuous in the axial direction between the slit portion of the hub and the tubular portion, thereby removing the medical device along the radial direction of the medical elongated body. [Effects of the Invention]

[0010] The (1) medical device configured as described above allows for easy modification of the diameter of the tubular section by changing the position where one end of the winding sheet overlaps, and also allows for easy removal of the medical device radially from the medical elongated body by unfolding the sheet after it has been removed from the blood vessel.

[0011] (2) In the medical device described in (1) above, the slit portion of the hub may be provided at a circumferential position that does not overlap with the sheet when it is unfolded. This allows the sheet to be removed from the medical device from the medical device without the sheet getting in the way, as a gap is formed between the slit portion of the hub, which is continuous in the axial direction, and both ends of the sheet when the sheet is unfolded.

[0012] (3) In the medical device described in (1) or (2) above, when one end of the sheet is wound around the other end, the free end of the sheet may be wound toward the opposite surface of the opening of the slit. This allows the medical device to be smoothly removed from the medical device by preventing the slit from being blocked by the sheet when the sheet is unfolded.

[0013] (4) In any of the medical devices described in (1) to (3) above, the hub may be fixed to one end of the sheet. This allows the medical device to easily form and maintain the shape of the tubular portion by winding the sheet and overlapping the other end with the surface of the sheet.

[0014] (5) In any of the medical devices described in (1) to (3) above, the hub may be fixed between the two ends of the sheet. This allows the medical device to easily form and maintain the shape of the tubular portion by winding the two ends of the sheet so that their surfaces overlap.

[0015] (6) In any of the medical devices described in (1) to (5) above, the hub may be detachable from the tubular portion around which the sheet is wound. This allows the medical device to easily maintain the shape of the wound sheet by attaching the tubular portion to the hub, and to easily remove the tubular portion from the medical device by removing it from the hub.

[0016] (7) In any of the medical devices described in (1) to (6) above, the hub may have a portion that can be fixed to the skin surface. This allows the medical device to fix and position the hub on the skin surface, making it easier to insert the medical device into a blood vessel.

[0017] (8) In the medical device described in (1) or (7) above, the hub may be formed by winding the portion of the sheet opposite to the tubular portion in a direction perpendicular to the direction in which both ends face each other. This allows the medical device to integrally form the tubular portion and the hub with the sheet, and since there is no need to fix the tubular portion to the hub, the procedure for introducing the medical device into a blood vessel can be made easier.

[0018] The method of inserting the (9) medical elongated body into a blood vessel, as described above, involves winding a sheet to form a tubular section according to the diameter of the medical elongated body, and the medical elongated body is inserted into the blood vessel by passing through the lumen of the tubular section. This makes it easier to insert multiple medical elongated bodies of different diameters into blood vessels using a single medical device.

[0019] (10) In the method of inserting the medical elongated body into a blood vessel as described in (9) above, when preparing the medical device, the sheet may be rolled up in an unfolded state, and one end of the sheet may be overlapped with the surface of the other end of the sheet to form the tubular portion having a lumen through which the medical elongated body is inserted. This allows the method of inserting the medical elongated body into a blood vessel to form a tubular portion having a diameter that matches the diameter of the medical elongated body before introducing the medical device into the blood vessel.

[0020] (11) In the method of inserting the medical elongated body described in (9) or (10) above into a blood vessel, the lumen of the tubular portion has an inner diameter smaller than the outer diameter of the medical elongated body, and the method may further include the step of increasing the inner diameter of the lumen by inserting a predilator having a larger outer diameter than the tubular portion into the lumen of the tubular portion introduced into the blood vessel, thereby changing the position of the other end of the sheet where one end of the sheet overlaps. This allows the method of inserting the medical elongated body into a blood vessel to initially form the tubular portion with a small diameter to facilitate introduction into the blood vessel, and then increase the diameter after introduction into the blood vessel to enable insertion of the medical elongated body. [Brief explanation of the drawing]

[0021] [Figure 1] This is a front view of a medical elongated body through which the medical device and dilator of this embodiment are inserted. [Figure 2] This is a front view of the medical device with the sheet unfolded. [Figure 3] This is a perspective view of medical devices. [Figure 4]It is a view of the thin tube part seen in the axial direction, where (a) shows the state where the inner diameter of the thin tube part is reduced, and (b) shows the state where the inner diameter of the thin tube part is increased. [Figure 5] It is a view of a state where a long medical body is to be inserted into a medical device introduced into a blood vessel. [Figure 6] It is a view of a state where the long medical body is inserted into the blood vessel. [Figure 7] It is a view of a state where the medical device is removed from the blood vessel and detached from the long medical body. [Figure 8] It is a view of a state where a pre-dilator is to be inserted into a medical device with a reduced inner diameter of the thin tube part. [Figure 9] It is a front view of a medical device according to the first modification example, where (a) shows the state where the hub is removed from the thin tube part, and (b) shows the state where the hub is attached to the thin tube part. [Figure 10] It is a front view of a medical device according to the second modification example, where (a) shows the state where the sheet is spread out, and (b) shows the state where the sheet is wound to form the thin tube part. [Figure 11] It is a view of a state where a medical device according to the third modification example is introduced into a blood vessel and fixed to the skin surface. [Figure 12] It is a front view of a medical device according to the fourth modification example. [Figure 13] It is a front view of the state where the sheet of the medical device according to the fifth modification example is spread out.

Embodiments for Carrying Out the Invention

[0022] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the dimensions in the drawings may be exaggerated for the convenience of explanation and may be different from the actual dimensions. Also, in this specification and the drawings, components having substantially the same functions are denoted by the same reference numerals, and redundant explanations are omitted.

[0023] The medical device 10 of this embodiment is an inserter used to insert a medical elongated body 100 into a blood vessel. The medical elongated body 100 is a cannula used in ECMO. However, the medical elongated body 100 is not limited to a cannula and may be a catheter or other elongated body used in other medical procedures.

[0024] As shown in Figures 1 and 3, the medical device 10 comprises a tubular section 21 having a lumen 22 through which a medical elongated body 100 is inserted, and a hub 30 having an inner space 31 communicating with the lumen 22. The medical elongated body 100 can enter the tubular section 21 from the hub 30.

[0025] The tubular section 21 is formed by winding a thin film sheet 20 into a tubular shape. As shown in Figure 2, the sheet 20 is rectangular and has one end 20a and the other end 20b. The other end 20b of the sheet 20 is fixed to the outer circumferential surface of the hub 30. The sheet 20 can be fixed to the hub 30 by heat fusion, but the means of fixing the sheet 20 to the hub 30 are not limited; for example, the sheet 20 may be fixed to the hub 30 with an adhesive. The other end 20b of the sheet 20 may also be fixed to the inner circumferential surface of the hub 30.

[0026] As shown in Figure 3, when the sheet 20 is wound, one end 20a and the other end 20b of the sheet 20 become discontinuous in the circumferential direction in the narrow tube section 21, and these extend along the axial direction of the narrow tube section 21. The wound end 20a of the sheet 20 overlaps with the surface of the other end 20b of the sheet 20. This allows the narrow tube section 21 to become tubular. Note that the end faces of the one end 20a and the other end 20b do not need to be precisely parallel and overlapping; for example, an irregular winding method that results in a tapered narrow tube section 21 is also acceptable.

[0027] A lubricating coating layer may be provided on the surface of the sheet 20 that is exposed to the outer circumference of the tubular portion 21. This facilitates the introduction of the tubular portion 21 into the blood vessel. However, the sheet 20 does not necessarily have to be provided with a lubricating coating layer.

[0028] As shown in Figures 4(a) and 4(b), the sheet 20 forming the tubular portion 21 can change the inner diameter of the lumen 22 by changing the circumferential position of one end 20a relative to the other end 20b. Therefore, the medical device 10 can accommodate multiple types of long medical devices with different outer diameters.

[0029] As shown in Figures 1 and 3, the hub 30 has a slit portion 32 that extends along the axial direction. The slit portion 32 has a width equal to or greater than the outer diameter of the medical elongated body 100 that is inserted into the medical device 10. Also, as shown in Figure 2, the slit portion 32 is located in a circumferential position that does not overlap with the sheet 20 when it is unfolded. When one end 20a of the sheet 20 is wound towards the other end 20b, the free end 20a is wound toward the opposite surface of the opening of the slit portion 32, so that the slit portion 32 is not blocked by the sheet 20 when the sheet 20 is unfolded. For this reason, the medical device 10 can be removed from the inserted medical elongated body 100 by unfolding the sheet 20 of the tubular portion 21 and passing it through the slit portion 32.

[0030] The material of the sheet 20 forming the tubular section 21 can be, for example, tetrafluoroethylene-hexafluoropropylene copolymer (FEP), tetrafluoroethylene-perfluoroalkoxyethylene copolymer (PFA), polytetrafluoroethylene (PTFE), polypropylene (PP), polyethylene terephthalate (PET), etc., but is not particularly limited. The material of the hub 30 can be, for example, polycarbonate (PC), ABS resin, polypropylene (PP), etc., but is not particularly limited.

[0031] Next, a method for inserting a medical elongated body 100 into a blood vessel using a medical device 10 will be described. Prior to the insertion of the medical elongated body 100, a guidewire 120 is already inserted into the blood vessel 210. The surgeon prepares the medical device 10 and the medical elongated body 100 to be inserted into the blood vessel 210. The medical device 10 may be pre-shaped with a sheet 20 wound around it, forming a tubular section 21 with a certain diameter through which the medical elongated body 100 can be inserted, or the sheet 20 may not be shaped, and the surgeon may wind the sheet 20 before insertion to form the tubular section 21. If the sheet 20 is not shaped, the surgeon winds the sheet 20 in an unfolded state, and forms a tubular section 21 with a lumen 22 through which the medical elongated body 100 can be inserted, by overlapping one end 20a of the sheet 20 with the surface of the other end 20b of the sheet 20. The narrow tube section 21 is formed to have an inner diameter that allows the medical elongated body 100 to be inserted. The dilator 110 is inserted through the medical elongated body 100, and the tip of the dilator 110 is positioned so that it is exposed beyond the tip of the medical elongated body 100.

[0032] As shown in Figure 5, the surgeon inserts a needle (not shown) into the blood vessel from the skin surface, then passes a guidewire 120 through the needle, removes the needle, and introduces the medical device 10 into the blood vessel 210 from the proximal end of the guidewire, with its tip remaining inside the blood vessel. At this time, the medical device 10 is kept in a wound state (coiled state) so that its diameter is as small as possible. After introducing the medical device 10, the surgeon passes the guidewire 120 through the dilator 110 and moves the dilator 110 and the medical elongated body 100 along the guidewire 120. As shown in Figure 6, the surgeon inserts the combination of the dilator 110 and the medical elongated body 100 into the lumen 22 of the tubular section 21 from the inner space 31 of the hub 30, and inserts it into the blood vessel 210. As shown in Figure 5, a step 101 is created in the insertion direction at the point where the dilator 110 protrudes from the tip of the medical elongated body 100 due to the difference in their outer diameters. However, since the dilator passes through the lumen 22 of the medical device 10 and is inserted into the blood vessel 210, the step 101 does not get caught, allowing for insertion.

[0033] Once the medical length 100 is inserted into the blood vessel 210, the surgeon removes the medical device 10 from the blood vessel 210. As shown in Figure 7, the medical device 10, after being removed from the blood vessel 210, can be radially detached from the medical length 100 by spreading out the sheet 20, through the gap between one end 20a and the other end 20b of the sheet 20 and the slit portion 32 of the hub 30. Furthermore, by removing the dilator 110 from the medical length 100, the procedure using the medical length 100 can be carried out.

[0034] The tubular portion 21 may have a smaller inner diameter than the medical elongated body 100 before being introduced into the blood vessel 210, and its diameter may be increased after it is introduced into the blood vessel 210. As shown in Figure 8, when the medical device 10 is introduced into the blood vessel 210, the tubular portion 21 has a smaller inner diameter than the medical elongated body 100. In this case, a pre-dilator 115 with a larger outer diameter than the tubular portion 21 is inserted into the lumen 22 of the tubular portion 21, changing the position of the other end of the sheet 20 where one end 20a of the sheet 20 overlaps, thereby expanding the tubular portion 21 and increasing the inner diameter of the lumen 22. If the inner diameter of the tubular portion 21 is sufficient to insert the medical elongated body 100, the medical elongated body 100 is inserted into the medical device 10. If the inner diameter of the tubular section 21 is not sufficient to insert the medical length 100, a pre-dilator with a larger outer diameter is inserted into the lumen 22 of the tubular section 21 to further expand the tubular section 21, and this step is repeated until the tubular section 21 has a sufficient inner diameter. In this way, the tubular section 21 is made small in diameter before being introduced into the blood vessel 210, and then its inner diameter is expanded with the pre-dilator 115 after the tubular section 21 has been introduced into the blood vessel 210 so that the medical length 100 can be inserted, making it easier to introduce the tubular section 21 into the blood vessel 210.

[0035] Next, a modified version of the medical device will be described. As shown in Figure 9(a), the medical device 50 may be detachable from the tubular portion 52 around which the sheet 51 is wound via a hub 53. As shown in Figure 9(b), by inserting the axial end of the tubular portion 52 into the hub 53 so that one end 51a of the sheet 51 that overlaps the surface of the sheet 51 does not overlap the slit portion 54 of the hub 53 in the circumferential direction, the shape of the tubular portion 52 around which the sheet 51 is wound can be maintained by the hub 53. When the medical device 50 is removed from the blood vessel, the hub 53 and the tubular portion 52 can be easily removed from the medical elongated body 100 by removing the hub 53 from the tubular portion 52.

[0036] As shown in Figure 10(a), the medical device 60 may have a sheet 61 that is fan-shaped. In this case, as shown in Figure 10(b), the sheet 61 can be wound to make the tubular portion 62 tapered towards the tip. This makes it easier to introduce the tubular portion 62 of the medical device 60 into a blood vessel.

[0037] As shown in Figure 11, the medical device 70 may have a fixing portion 73a on the hub 73 for fixing to the skin surface 200. The fixing portion 73a protrudes circumferentially from the outer surface of the hub 73 and has an adhesive or the like on its surface that can fix it to the skin surface 200. However, the fixing portion can have any configuration as long as it is a structure that can be fixed to the skin surface 200.

[0038] As shown in Figure 12, the medical device 80 may be configured such that a tubular section 82 and a hub 83 are formed by winding a sheet 81. That is, the medical device 80 has the tubular section 82 and the hub 83 integrally formed. A folded portion 83a is formed at the base end of the hub 83 by folding back the sheet 81. The folded portion 83a allows for positioning of the medical device 80 relative to the skin surface when it is introduced into a blood vessel. In the tubular section 82 portion of the sheet 81, one end 81a overlaps the surface of the sheet 81 on the other end 82b side. Also, in the hub section of the sheet 81, one end 81a and the other end 82b are separated circumferentially to form a slit portion 84.

[0039] As shown in Figure 13, the medical device 10 may have a hub 30 fixed between both ends of a sheet 20 having one end 20a and the other end 20b. In this case as well, the slit portion 32 is provided in a circumferential position that does not overlap with the sheet 20 when it is unfolded.

[0040] As described above, the (1) medical device 10 according to this embodiment is a medical device 10 through which a medical elongated body 100 can be inserted, and comprises a tubular portion 21 formed by winding a thin film sheet 20 to create a lumen through which the medical elongated body 100 can be inserted, and a hub 30 having an inner space 31 that communicates with the lumen 22 and a slit portion 32 that connects the inner space 31 to the outside, wherein the sheet 20 forming the tubular portion 21 has both ends 20a and 20b that are discontinuous in the circumferential direction and extend along the axial direction of the tubular portion 21, and one end 20a of the wound sheet 20 overlaps the surface of the other end 20b of the sheet 20. With the medical device 10 configured in this way, the diameter of the tubular portion 21 can be easily changed by changing the position where one end 20a of the wound sheet 20 overlaps, and the medical device 10 can be easily removed radially from the medical elongated body 100 by unfolding the sheet 20 while it is removed from the blood vessel.

[0041] (2) In the medical device 10 described in (1) above, the slit portion 32 of the hub 30 may be provided at a circumferential position that does not overlap with the sheet 20 when it is unfolded. This allows the medical device 10 to avoid the sheet 20 getting in the way when the sheet 20 is unfolded, as a gap is formed between the slit portion 32 of the hub 30, which is continuous in the axial direction, and both ends of the sheet 20.

[0042] (3) In the medical device 10 described in (1) or (2) above, when one end 20a of the sheet 20 is wound around the other end 20b, the free end 20a may be wound toward the opposite side of the opening of the slit portion 32. This allows the medical device 10 to be smoothly removed from the medical elongated body 100 by preventing the slit portion 32 from being blocked by the sheet 20 when the sheet 20 is unfolded.

[0043] (4) In any of the medical devices 10 described in (1) to (3) above, the hub 30 may be fixed to one end 20a of the sheet 20. This allows the medical device 10 to easily form and maintain the shape of the tubular portion 21 by winding the sheet 20 and overlapping the other end 20b on the surface of the sheet 20.

[0044] (5) In any of the medical devices 10 described in (1) to (3) above, the hub 30 may be fixed between the ends of the sheet 20. This allows the medical device 10 to easily form and maintain the shape of the tubular portion 21 by winding the ends of the sheet 20 so that their surfaces overlap.

[0045] (6) In any of the medical devices 50 described in (1) to (5) above, the hub 53 may be detachable from the tubular portion 52 around which the sheet 51 is wound. This allows the medical device 50 to easily maintain the shape of the tubular portion 52 around the sheet 51 by attaching it to the hub 53, and to easily remove the tubular portion 52 from the medical device 100 by removing it from the hub 53.

[0046] (7) In any of the medical devices 70 described in (1) to (6) above, the hub 73 may have a fixing portion for the skin surface 200. This allows the medical device 70 to fix and position the hub 73 on the skin surface 200, making it easier to insert the medical elongated body 100 into the blood vessel.

[0047] (8) In the medical device 80 described in (1) or (7) above, the hub 83 may be formed by winding the portion of the sheet 81 opposite to the tubular portion 82 in a direction perpendicular to the direction in which both ends face each other. This allows the medical device 80 to have the tubular portion 82 and the hub 83 integrally formed by the sheet 81, and since there is no need to fix the tubular portion 82 to the hub 83, the procedure for introducing the medical device 80 into a blood vessel can be made easier.

[0048] The method for inserting the (9) medical elongated body 100 into a blood vessel according to this embodiment includes the steps of preparing a medical device 10 and a medical elongated body 100, the medical device 10 having a tubular portion 21 in which a lumen 22 is formed by winding a thin film sheet 20, and a hub 30 having an inner space 31 communicating with the lumen 22 and a slit portion 32 that connects the inner space 31 to the outside; introducing the tubular portion 21 into a blood vessel; inserting the medical elongated body 100 into the lumen 22 of the tubular portion 21 from the inner space 31 of the hub 30, thereby inserting the medical elongated body 100 into the blood vessel; and removing the tubular portion 21 from the blood vessel, spreading out the sheet 20 to form a gap between both ends that is continuous in the axial direction of the slit portion 32 of the hub 30 and the tubular portion 21, thereby removing the medical device 10 along the radial direction of the medical elongated body 100. In this method of inserting the medical elongated body 100 into a blood vessel, the sheet 20 is wound to match the diameter of the medical elongated body 100 to form a tubular section 21, and the medical elongated body 100 is inserted into the blood vessel by passing through the lumen 22 of the tubular section 21. This makes it easier to insert multiple medical elongated bodies 100 of different diameters into blood vessels using a single medical device 10.

[0049] (10) In the method of inserting the medical elongated body 100 into a blood vessel as described in (9) above, when preparing the medical device 10, the sheet 20 may be rolled up in an unfolded state, and one end of the sheet 20 may be overlapped with the surface of the other end of the sheet 20 to form a tubular portion 21 having a lumen 22 through which the medical elongated body 100 can be inserted. This allows the method of inserting the medical elongated body 100 into a blood vessel to form a tubular portion 21 having a diameter that matches the diameter of the medical elongated body 100 before introducing the medical device 10 into the blood vessel.

[0050] (11) In the method of inserting the medical elongated body 100 according to (9) or (10) above into a blood vessel, the lumen 22 of the tubular portion 21 has an inner diameter smaller than the outer diameter of the medical elongated body 100, and the method may further include the step of increasing the inner diameter of the lumen 22 by inserting a predilator 115 having a larger outer diameter than the tubular portion 21 into the lumen 22 of the tubular portion 21 that has been introduced into the blood vessel, thereby changing the position of the other end of the sheet 20 where one end of the sheet 20 overlaps. This allows the method of inserting the medical elongated body 100 into a blood vessel to initially form the tubular portion 21 with a small diameter to facilitate introduction into the blood vessel, and then increase the diameter after introduction into the blood vessel to enable insertion of the medical elongated body 100.

[0051] It should be noted that the present invention is not limited to the embodiments described above, and various modifications can be made by those skilled in the art within the technical framework of the present invention. [Explanation of symbols]

[0052] 10 Medical Devices 20 sheets 20a One end 20b Other end 21. Capillary section 22 lumen 23 seats 30 Hubs 31 Interior space 32 Slit section 35 Hub 36 Hubs 36a Fixed part

Claims

1. A medical device through which a long medical object can be inserted, A thin tube section formed by winding a thin film sheet to create a lumen through which the aforementioned long medical device is inserted, The hub comprises an inner space that communicates with the aforementioned lumen and a slit portion that connects the inner space to the outside, A medical device in which the sheet forming the tubular portion has both ends that are discontinuous in the circumferential direction and each end extends along the axial direction of the tubular portion, and one end of the wound sheet overlaps the surface of the other end of the sheet.

2. The medical device according to claim 1, wherein the slit portion of the hub is provided at a circumferential position that does not overlap with the sheet when it is extended.

3. The medical device according to claim 1, wherein when one end of the sheet is wound around the other end, the free end of the sheet is wound toward the surface opposite the opening of the slit portion.

4. The medical device according to claim 1, wherein the hub is fixed to one end of the sheet.

5. The medical device according to claim 1, wherein the hub is fixed between both ends of the sheet.

6. The medical device according to claim 1, wherein the hub is detachably attached to the tubular portion around which the sheet is wound.

7. The medical device according to claim 1, wherein the hub has a portion that is fixed to the skin surface.

8. The medical device according to claim 1, wherein the hub is formed by winding the portion of the sheet opposite to the tubular portion in a direction perpendicular to the direction in which both ends face each other.

9. A medical device comprising a tubular section in which a lumen is formed by winding a thin film sheet, and a hub having an inner space communicating with the lumen and a slit section that connects the inner space to the outside, and a medical elongated body, The steps include introducing the aforementioned tubular portion into a blood vessel, The steps include inserting the medical elongated body from the inner space of the hub into the lumen of the tubular portion, and inserting the medical elongated body into the blood vessel, The steps include removing the tubular portion from the blood vessel, spreading the sheet to form a gap between both ends that is continuous in the axial direction between the slit portion of the hub and the tubular portion, and removing the medical device along the radial direction of the medical elongated body, A method for inserting a medical-grade, elongated instrument into a blood vessel.

10. A method for inserting a medical elongated body into a blood vessel according to claim 9, wherein when preparing the medical device, the sheet is rolled up in an unfolded state, and one end of the sheet is made to overlap with the surface of the other end of the sheet, thereby forming the tubular portion having a lumen through which the medical elongated body is inserted.

11. The lumen of the aforementioned tubular section has an inner diameter smaller than the outer diameter of the medical elongated body. A method for inserting a medical elongated body into a blood vessel according to claim 9, further comprising the step of inserting a predilator having a larger outer diameter than the tubular portion into the lumen of the tubular portion introduced into the blood vessel, thereby changing the position of the other end of the sheet where one end of the sheet overlaps, and thereby increasing the inner diameter of the lumen.

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