JP2024170778A - Introducer sheath - Google Patents

Abstract

To improve the operability of a sheath for an introducer which has a relatively large diameter.SOLUTION: A sheath 100 for an introducer comprises: a sheath main body 110 which is percutaneously introduced into a body lumen, into which a medical device can be inserted, and has a lumen 111 through which fluid can circulate; and a hub 120 which is connected to the base end side of the sheath main body and has a valve body 123 with an internal space 124 which can displace inward, an inner wall face through which a medical device can be inserted, by introduction of liquid, and can displace outward the inner wall face by discharge of the liquid. The hub has a common port 130 which is communicated with the lumen from an inlet 131 and communicated with the internal space.SELECTED DRAWING: Figure 2

Description

The present invention relates to a sheath for an introducer.

Conventionally, introducers have been used as medical instruments for forming an access path into a blood vessel in procedures using a catheter. A typical introducer includes an introducer sheath and a dilator. The introducer sheath also includes a sheath body (sheath tube) with a lumen formed therein, and a hub connected to the sheath body (see Patent Document 1).

In a procedure using an introducer, the surgeon inserts a dilator into the lumen of the sheath body and then percutaneously inserts the introducer sheath into the blood vessel through a puncture (perforation) made in the patient's limb, etc., with the dilator inserted and fixed in place in the lumen of the sheath body. The surgeon removes the dilator from the sheath body with the tip of the sheath body inserted into the blood vessel. After removing the dilator from the sheath body, the surgeon can introduce a guidewire or various catheters into the blood vessel through the lumen of the sheath body.

JP 2018-167078 A

A hemostatic valve is provided at the hub of the introducer sheath to prevent blood from flowing back from the tip when the introducer sheath is inserted into a biological lumen, and the inner wall surface of the sheath body can be cleaned by injecting physiological saline into the sheath body. Among introducer sheaths with a relatively large diameter, there are those that have a port for circulating liquid into the internal space of the hemostatic valve and a port for circulating liquid on the inner wall surface of the sheath body separately provided in order to enable the hemostatic valve to function as a valve, as in Patent Document 1. In such a configuration, it is necessary to connect a stopcock to each of the port for circulating liquid to the hemostatic valve and the port for flowing liquid into the sheath body, and the inventor noticed that the operability is poor, and after extensive research, he arrived at the present invention.

At least one embodiment of the present invention has been made to solve the above-mentioned problems, and aims to improve the operability of a relatively large-diameter introducer sheath.

The present invention can be achieved by any one of the following means (1) to (7).

(1) A sheath for introducer, comprising: a sheath body that is percutaneously introduced into a biological lumen, through which a medical instrument can be inserted, and which has a lumen through which a liquid can flow; and a hub that is connected to the base end side of the sheath body and has a valve body having an internal space that can displace the inner wall surface through which the medical instrument can be inserted inward by introducing the liquid and displace the inner wall surface outward by discharging the liquid, the hub having an inlet that leads to the lumen and a common port that leads to the internal space.

(2) The sheath for introducer described in (1) includes a common section in which a flow path from the inlet to the lumen and the internal space is shared up to a certain point, a first branch section that branches from the common section to the lumen, and a second branch section that branches from the common section to the internal space.

(3) The sheath for introducer described in (2) is provided with a valve in the first branch section that prevents the liquid from flowing into the lumen until the pressure reaches or exceeds a threshold value, and allows the liquid to flow into the lumen when the pressure reaches or exceeds the threshold value.

(4) The sheath for introducer described in (2) or (3) is provided in the second branch section with a check valve that prevents the liquid that has flowed into the internal space from flowing into the common section.

(5) The sheath for introducer described in (2) is provided at a branch point where the common section branches into the first branch section and the second branch section with a switching member that can be operated by a user to switch whether the liquid flowing from the inlet flows through the first branch section or the second branch section.

(6) The sheath for introducer described in (1) has a partition wall that separates a first flow path leading from the inlet of the common port to the lumen and a second flow path leading from the inlet to the internal space.

(7) The partition wall is formed to separate an inner side from an outer side in a radial direction of the inlet of the common port,
The sheath for introducer according to (6), wherein the common port is provided so as to connect an inside of the common port to the partition wall and includes a support portion that supports the partition wall.

The introducer sheath described above can improve the operability of a relatively large diameter introducer sheath.

FIG. 2 is a diagram showing an introducer according to the first embodiment. FIG. 2 shows the flow of liquid from the inlet of the common port of the introducer sheath of FIG. 1. FIG. 2 shows the flow of liquid from the inlet of the common port of the introducer sheath of FIG. 1. FIG. 11 is a view showing the vicinity of a common port of an introducer sheath according to a second embodiment. FIG. 5 shows the flow of liquid from the inlet of the common port of the introducer sheath of FIG. 4. FIG. 5 shows the flow of liquid from the inlet of the common port of the introducer sheath of FIG. 4. A diagram showing the flow of liquid from the inlet of the common port of the introducer sheath according to the third embodiment. FIG. 13 is a view showing an inlet of a common port of an introducer sheath according to a third embodiment.

The following describes in detail the embodiments of the present invention with reference to the drawings. The embodiments shown here are merely illustrative in order to embody the technical ideas of the present invention, and do not limit the present invention. Furthermore, all other possible embodiments, examples, and operational techniques that can be conceived by those skilled in the art without departing from the gist of the present invention are included in the scope and gist of the present invention, and are included in the scope of the inventions described in the claims and their equivalents.

Furthermore, for the convenience of illustration and ease of understanding, the drawings attached to this specification may be represented diagrammatically with appropriate changes in scale, aspect ratio, shape, etc. from the actual product, but these are merely examples and do not limit the interpretation of the present invention.

In the following description, ordinal numbers such as "first" and "second" are used for convenience and do not specify any particular order unless otherwise specified. Figure 1 shows an introducer 10 according to the first embodiment. Figures 2 and 3 show the flow of liquid from the inlet 131 of the common port 130 of the introducer sheath 100 shown in Figure 1.

(Introducer 10)
As shown in FIG. 1 , the introducer 10 has an introducer sheath 100 and a dilator 200 .

The introducer sheath 100 can be used to introduce the dilator body 210 of the dilator 200 and various medical instruments (catheter devices, guide wires, etc.) into a biological lumen through the lumen 111 of the sheath body 110 (see Figures 2 and 3). The introducer sheath 100 according to this embodiment can be used with a stent graft or for thrombus aspiration. In the following description, the side of the hand-operated portion of the introducer sheath 100 is referred to as the "base end side," and the side that is inserted into the body cavity is referred to as the "distal end side." In the following description, a blood vessel is used as an example of a biological lumen.

(Introducer sheath 100)
1 to 3, the introducer sheath 100 includes a sheath body 110, a hub 120 attached to the proximal end side of the sheath body 110, and a common port 130 provided inside the hub 120. A detailed description will be given below.

(Sheath body 110)
The sheath body 110 is a tubular member that is percutaneously inserted into a living body lumen, through which a medical instrument such as a catheter can be inserted, and that has a lumen 111 through which a liquid can flow. The sheath body 110 can be configured to be about 20 Fr and have an inner diameter of 7 mm or more.

The sheath body 110 may be made of a polymer material such as polyolefin (e.g., polyethylene, polypropylene, polybutene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ionomer, or a mixture of two or more of these), polyolefin elastomer, crosslinked polyolefin, polyvinyl chloride, polyamide, polyamide elastomer, polyester, polyester elastomer, polyurethane, polyurethane elastomer, fluororesin (e.g., polytetrafluoroethylene, tetrafluoroethylene-ethylene copolymer), polycarbonate, polystyrene, polyacetal, polyimide, polyetherimide, polyetheretherketone, or a mixture of these.

(Hub 120)
The hub 120 is connected to the proximal end side of the sheath body 110. The hub 120 according to this embodiment is formed with a common port 130 that communicates with the inside of the sheath body 110. One end of a flexible tube 140 made of, for example, polyvinyl chloride is liquid-tightly connected to the common port 130. A three-way stopcock 150, for example, is attached to the other end of the tube 140. A liquid such as physiological saline is injected into the introducer sheath 100 from the port of the three-way stopcock 150 via the tube 140.

2, the hub 120 has a hub body 121, a central hole 122 formed in the hub body 121 and communicating with the lumen 111 of the sheath body 110, and a valve body 123 provided on the base end side of the central hole 122. The valve body 123 has an inner wall surface 125 through which a medical instrument can be inserted, which can be displaced inward by introducing a liquid, and an internal space 124 in which the inner wall surface 125 can be displaced outward by discharging the liquid. By introducing a liquid into the internal space 124 of the valve body 123 to expand the valve body 123, it is possible to prevent blood from flowing out of the body through the inner wall surface 125 when the sheath body 110 or a medical instrument is inserted into a blood vessel or the like.

The liquid flowing from the inlet 131 of the common port 130 forms a flow path to flow to the internal space 124 of the valve body 123 and the lumen 111 of the sheath body 110. In this embodiment, the flow path from the common port 130 to the valve body 123 and the lumen 111 of the sheath body 110 includes a common section 132, a first branch section 133 branching from the common section 132, and a second branch section 134, as shown in Figures 2 and 3.

The common section 132 is configured as a section in which the flow path from the inlet 131 of the common port 130 to the internal space 124 of the valve body 123 and the flow path to the lumen 111 of the sheath body 110 are shared up to a certain point. The common section 132 is illustrated as being linear in Figures 2 and 3, but this is merely an example and does not have to be linear.

The first branch section 133 is configured as a flow path branching from the common section 132 to the lumen 111 of the sheath body 110. The first branch section 133 can be provided with a valve 135 that blocks the flow of liquid from the inlet 131 to the lumen 111 up to a predetermined pressure and allows the liquid to flow into the lumen 111 when the pressure value exceeds a threshold value. The threshold value of the valve 135 is the pressure at which the valve bodies 123 come into close contact with each other, blood does not leak, and the medical device expands to an extent that it can be inserted through the valve body 123. When the threshold value is exceeded, the valve 135 opens, allowing the liquid to flow and flow into the lumen 111 via the first branch section 133. The valve 135 can be of a known structure such as an umbrella valve.

The second branch section 134 is configured as a flow path branching from the common section 132 to the internal space 124 of the valve body 123. A check valve 136 can be provided near the branch point of the second branch section 134 to prevent liquid that has flowed into the internal space 124 from flowing into the common section 132. The check valve 136 is configured to prevent liquid in the valve body 123 from flowing back to the common section 132 even if a medical instrument is inserted into the valve body 123 and pressure is generated inside the valve body 123. The check valve 136 can be configured of an elastically deformable member, and can be formed so that the center of the member opens to allow flow from the common section 132 to the internal space 124 (see FIG. 2), and the center of the member closes to prevent flow from the internal space 124 to the common section 132 (see FIG. 3). A known structure such as a duckbill valve can be used as the check valve.

The material of which the hub 120 is made is not particularly limited, but a hard material such as a hard resin is preferable. Specific examples of hard resins include polyolefins such as polyethylene and polypropylene, polyamides, polycarbonates, and polystyrene.

The materials from which the valve body 123, the valve 135, and the check valve 136 are made are not particularly limited, but examples include elastic materials such as silicone rubber, latex rubber, butyl rubber, and isoprene rubber.

(Dilator 200)
As shown in FIG. 1 , the dilator 200 has a dilator body 210 formed of a tubular body that can be inserted into the sheath body 110 , and a dilator hub 220 that can be connected to the hub 120 .

The dilator 200 is used to prevent the sheath body 110 of the introducer sheath 100 from bending and to widen the skin perforation when the sheath body 110 is inserted into a biological lumen.

The material constituting the dilator body 210 is not particularly limited, and the same materials as those conventionally used for the dilator body 210 can be used. Specific examples include polyolefins such as polypropylene (PP) and polyethylene (PE), polyesters such as nylon and polyethylene terephthalate (PET), and fluorine-based polymers such as polyvinylidene fluoride (PVDF) and tetrafluoroethylene-hexafluoropropylene copolymer (FEP).

The material of which the dilator hub 220 is made is not particularly limited, but a hard material such as a hard resin is preferable. Specific examples of hard resins include polyolefins such as polyethylene and polypropylene, polyamides, polycarbonates, and polystyrene.

Next, we will explain the treatment method using the introducer sheath 100 according to this embodiment.

First, a hole is made in a predetermined position of the skin using an introduction needle or the like, a guide wire is inserted, for example, into a blood vessel through the lumen of the introduction needle, and the introduction needle is removed from the lumen of the body while the guide wire is left in the lumen of the body. Then, physiological saline is flowed from the tube 140 through the three-way stopcock 150 into the inlet 131 of the common port 130. When physiological saline flows from the inlet 131, the valve 135 remains closed and the check valve 136 operates to open, so that physiological saline flows into the internal space 124, expanding the valve body 123 (see the arrow in FIG. 2). When the valve body 123 is sufficiently expanded, the liquid no longer flows into the internal space 124, the pressure near the valve 135 rises, and when the pressure exceeds a threshold value, the liquid flows through the valve 135 and into the lumen 111, and the sheath body 110 is washed (see the arrow in FIG. 3). After cleaning of the sheath body 110 is completed, close the flow path of the three-way stopcock 150 to stop the injection of saline.

Next, the introducer 10 is inserted while the dilator 200 is aligned with the guidewire placed in the biological lumen. Then, the guidewire and the dilator 200 are removed from the introducer sheath 100 while the introducer sheath 100 is left in the biological lumen. This allows the introducer sheath 100 to function as a passage connecting the outside of the body with the inside of the blood vessel, and a medical instrument such as a catheter can be inserted into the blood vessel through this sheath to perform various procedures.

As described above, the introducer sheath 100 according to this embodiment includes a sheath body 110 and a hub 120. The sheath body 110 is percutaneously introduced into a biological lumen, and is configured to include a lumen 111 through which a medical instrument can be inserted and through which a liquid can flow. The hub 120 is connected to the base end side of the sheath body 110 and includes a valve body 123 having an internal space 124 that can displace an inner wall surface 125 through which a medical instrument can be inserted inward by introducing a liquid and displace the inner wall surface 125 outward by discharging the liquid. The hub 120 includes a common port 130 that communicates with the lumen 111 of the sheath body 110 from an inlet 131 and communicates with the internal space 124.

By circulating liquid from the common port 130 in this way, it is possible to prevent blood leakage due to expansion of the valve body 123 and to clean the lumen 111. In addition, since the sheath body 110 can be cleaned and the valve body 123 can be expanded using the common port 130, it is possible to clean the sheath and connect tubes, etc., only once to expand the valve body. This can improve or enhance the operability of the introducer sheath.

The common port 130 also includes a common section 132, a first branch section 133, and a second branch section 134. The common section 132 corresponds to a portion where the flow paths from the inlet 131 to the lumen 111 and the internal space 124 are common up to a certain point. The first branch section 133 is configured to branch from the common section 132 to the lumen 111. The second branch section 134 is configured to branch from the common section 132 to the internal space 124. This allows the liquid flowing in from the inlet 131 of the common port 130 to flow through the lumen 111 to clean the sheath body 110, and to flow through the internal space 124 of the valve body 123 to expand the valve body 123 and function as the valve body 123.

The first branch section 133 is also configured to have a valve 135 that prevents liquid from flowing into the lumen 111 until the pressure reaches or exceeds a threshold value, and allows liquid to flow into the lumen 111 when the pressure reaches or exceeds the threshold value. This allows liquid from the inlet 131 to flow into the internal space 124 until the pressure reaches or exceeds the threshold value, causing the valve body 123 to expand and preventing blood leakage, and after the valve body 123 expands, liquid can be allowed to flow into the lumen 111 to clean the sheath body 110.

The second branch section 134 is also configured to have a check valve 136 that prevents the liquid that has flowed into the internal space 124 from flowing into the common section 132. This configuration prevents or suppresses a decrease in the function of the valve body 123 to prevent blood leakage due to the liquid in the internal space 124 flowing into the lumen 111, which weakens the expansion of the valve body 123.

Second Embodiment
Fig. 4 is a diagram showing a hub 120a of an introducer sheath 100a according to the second embodiment. Figs. 5 and 6 are diagrams for explaining the flow of liquid from a common port 130a inside the hub 120a in Fig. 4.

In the first embodiment, it has been explained that the flow path from the inlet 131 of the common port 130 is configured with the common section 132 that is common to the lumen 111 and the internal space 124 up to a certain point, and the first branch section 133 and the second branch section 134 that branch off from the common section 132. However, the flow path from the common port can also be configured as follows. Note that the sheath body 110 is the same as in the first embodiment, so a description of the common parts will be omitted.

The flow path from the inlet 131 of the common port 130a includes a common section 132a, a first branch section 133a that branches from the common section 132a to the lumen 111, and a second branch section 134a that branches from the common section 132a to the internal space 124, as in the first embodiment (see Figures 4 to 6). The common section 132a, the first branch section 133a, and the second branch section 134a have different shapes from the common section 132, the first branch section 133, and the second branch section 134 of the first embodiment. Therefore, although the symbols are different from those of the common section 132, the first branch section 133, and the second branch section 134 of the first embodiment, the functions of each are the same as in the first embodiment. Therefore, detailed explanations of each will be omitted.

At the branching point between the common section 132a, the first branching section 133a, and the second branching section 134a, a switching member 135a is installed that can switch whether the liquid flowing in from the inlet 131 flows through the first branching section 133a or the second branching section 134a in response to a user's operation.

As shown in Figures 4 to 6, the switching member 135a includes a gripping portion 136a that can be gripped by the user, and a rotating member 137a that can switch between the flow of the common section 132a and the first branch section 133a or the second branch section 134a in response to the operation of the gripping portion 136a. The gripping portion 136a can be formed to have a longitudinal portion so that the flow direction of the liquid can be easily recognized, but the specific shape is not particularly limited.

The rotating member 137a is configured to be rotatable in response to the operation of the gripping portion 136a, and is configured to allow the liquid flowing from the common section 132a to flow to either the first branch section 133a or the second branch section 134a. The rotating member 137a forms a cavity so that the liquid can flow to either the first branch section 133a or the second branch section 134a, as shown in Figures 5 and 6.

The method of using the introducer sheath 100a according to this embodiment is to operate the gripping portion 136a of the switching member 135a by the user so that it is connected to the internal space 124 as shown in FIG. 5, and then to flow physiological saline to expand the valve body 123. When the valve body 123 is sufficiently expanded, the gripping portion 136a is rotated to switch the flow direction of the liquid as shown in FIG. 6. This allows the liquid from the common port 130a to flow through the lumen 111, and the sheath body 110 is washed. The rest is the same as in the first embodiment, so a description will be omitted. In the above, the valve body 123 is expanded and then the sheath body 110 is washed, but the valve body 123 may be expanded after the sheath body 110 is washed.

As described above, the introducer sheath 100a according to this embodiment is provided with a switching member 135a at the branch point where the common section 132a branches into the first branch section 133a and the second branch section 134a. The switching member 135a is configured to be able to switch, by the user's operation, whether the liquid flowing in from the inlet 131 of the common port 130a is to flow through the first branch section 133a or the second branch section 134a. By configuring it in this way, the user can freely switch, by operation, whether the liquid flowing through the common port 130a is to be used for cleaning the sheath body 110 or for expanding the valve body 123.

Third Embodiment
Fig. 7 is a cross-sectional view showing the inside of a hub 120b of an introducer sheath 100b according to the third embodiment, and Fig. 8 is a view showing a common port 130b of the hub 120b according to Fig. 7. In the first embodiment, it has been described that the flow path from the inlet 131 of the common port 130 is composed of the common section 132, the first branch section 133, and the second branch section 134. However, the flow path from the common port for washing the sheath body 110 and expanding the internal space 124 of the valve body 123 can be configured as follows. Note that the configuration of the sheath body 110 is similar to that of the first embodiment, and therefore description thereof will be omitted.

In this embodiment, the flow path near the inlet 131b of the common port 130b is configured to be divided into an outer first flow path 132b and an inner second flow path 133b in the radial direction by a partition wall 134b, as shown in Figures 7 and 8. The first flow path 132b of the common port 130b is configured to communicate with the lumen 111 of the sheath body 110 from the inlet 131b. The second flow path 133b of the common port 130b is formed to communicate with the internal space 124 from the inlet 131b.

The partition wall 134b, which separates the inside and outside at the inlet 131b of the common port 130b, is connected integrally to the inner wall 136b of the common port 130b by a connecting wall 135b (corresponding to a support portion) as shown in FIG. 8. The partition wall 134b is formed so that the area of the second flow path 133b is larger than the area of the first flow path 132b when the common port 130b is viewed from the front. The partition wall 134b can be configured to be thicker than the wall thickness of the tube 140 (a tubular member connected to the common port) so that the first flow path 132b is not blocked by bending during use. The configuration for separating the lumen through which the liquid flows into the first flow path and the second flow path can also be configured in the tube 140 in a similar manner.

The connecting walls 135b are configured to support the partition walls 134b. Four connecting walls 135b are provided at approximately equal angles in the angular direction in FIG. 8. However, as long as the partition walls 134b can be integrated with the inner wall 136b of the common port 130b, the number of connecting walls 135b does not have to be four, and when there are multiple connecting walls 135b, the angular intervals do not have to be equal. The number of connecting walls can be two or more.

As an example of use of the introducer sheath 100b according to this embodiment, when physiological saline is circulated from the three-way stopcock 150, the inlet 131b of the common port 130b is provided with a second flow path 133b leading to the internal space 124 and a first flow path 132b leading to the lumen 111. Therefore, liquid such as physiological saline flows from the second flow path 133b to the internal space 124, and at the same time, flows from the first flow path 132b to the lumen 111. This allows the operation of expanding the valve body 123 and the cleaning of the sheath body 110 to be performed simultaneously. Other operations are the same as those in the first embodiment, so a description thereof will be omitted.

As described above, in this embodiment, a partition wall 134b is provided to separate the first flow path 132b that leads from the inlet 131b of the common port 130b to the lumen 111 and the second flow path 133b that leads from the inlet 131b to the internal space 124. Therefore, by circulating liquid from the common port 130b, the valve body 123 can be expanded and the sheath body 110 can be washed at the same time.

The partition wall 134b is formed to separate the radial inside and outside of the inlet 131b of the common port 130b. The common port 130b is provided to connect the inner wall 136b of the common port 130b and the partition wall 134b, and includes a connecting wall 135b as a support part that supports the partition wall 134b. This allows the partition wall 134b to be held integrally with the common port 130b, allowing liquid from the inlet 131b to flow between the internal space 124 and the lumen 111.

The present invention is not limited to the above-mentioned embodiment and modified examples, and various modifications are possible within the scope of the claims. Although it has been explained that the biological lumen that is the target of the procedure using the introducer sheath is a blood vessel, if an introducer sheath equipped with a common port can be used, the introducer sheath may be used in a site other than a blood vessel.

In addition, the structure of each part and the arrangement of the parts described in the specification may be changed as desired. Additional parts described in the drawings may be omitted, or other additional parts may be used as desired.

100, 100a, 100b sheath for introducer,
110 sheath body,
111 lumens,
120 Hub,
123 valve body,
124 Internal space (internal space of valve body),
125 Inner wall surface (inner wall surface of valve body),
130, 130a, 130b common port,
131, 131b inlet (common port inlet),
132, 132a common section,
132b first flow path,
133, 133a first branch section,
133b second flow path,
134, 134a second branch section,
135 valves,
135a switching member,
134b partition wall,
136 check valve,
135b Connecting wall (support part).

Claims (7)

a sheath body that is percutaneously introduced into a biological lumen, through which a medical instrument can be inserted, and that has a lumen through which a liquid can flow;
a hub including a valve body connected to a base end side of the sheath body and having an internal space in which an inner wall surface through which the medical instrument can be inserted can be displaced inward by introducing the liquid and the inner wall surface can be displaced outward by discharging the liquid,
The hub is an introducer sheath having an inlet leading to the lumen and a common port leading to the internal space. The sheath for introducer according to claim 1, wherein the common port comprises a common section in which a flow path from the inlet to the lumen and the internal space is shared up to a certain point, a first branch section that branches from the common section to the lumen, and a second branch section that branches from the common section to the internal space. The introducer sheath according to claim 2, wherein the first branch section is provided with a valve that prevents the liquid from flowing into the lumen until the pressure reaches or exceeds a threshold value, and allows the liquid to flow into the lumen when the pressure reaches or exceeds the threshold value. The introducer sheath according to claim 2 or 3, wherein the second branch section is provided with a check valve that prevents the liquid that has flowed into the internal space from flowing into the common section. The sheath for introducer according to claim 2, wherein a switching member is provided at a branching point where the common section branches into the first branch section and the second branch section, and the switching member can be operated by a user to switch whether the liquid flowing from the inlet flows through the first branch section or the second branch section. The introducer sheath according to claim 1, wherein the common port has a partition wall that separates a first flow path that leads from the inlet of the common port to the lumen and a second flow path that leads from the inlet to the internal space. the partition wall is formed to separate an inner side from an outer side in a radial direction of the inlet of the common port,
The sheath for introducer according to claim 6 , wherein the common port includes a support portion that is provided to connect an inside of the common port to the partition wall and supports the partition wall.