WO2014162452A1 - イントロデューサシースおよびその使用方法 - Google Patents
イントロデューサシースおよびその使用方法 Download PDFInfo
- Publication number
- WO2014162452A1 WO2014162452A1 PCT/JP2013/059931 JP2013059931W WO2014162452A1 WO 2014162452 A1 WO2014162452 A1 WO 2014162452A1 JP 2013059931 W JP2013059931 W JP 2013059931W WO 2014162452 A1 WO2014162452 A1 WO 2014162452A1
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- WIPO (PCT)
- Prior art keywords
- lumen
- sub
- sheath
- introducer sheath
- deformed
- Prior art date
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/0021—Catheters; Hollow probes characterised by the form of the tubing
- A61M25/0023—Catheters; Hollow probes characterised by the form of the tubing by the form of the lumen, e.g. cross-section, variable diameter
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/10—Balloon catheters
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
- A61M25/06—Body-piercing guide needles or the like
- A61M25/0662—Guide tubes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/0021—Catheters; Hollow probes characterised by the form of the tubing
- A61M25/0023—Catheters; Hollow probes characterised by the form of the tubing by the form of the lumen, e.g. cross-section, variable diameter
- A61M2025/0024—Expandable catheters or sheaths
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/10—Balloon catheters
- A61M2025/1043—Balloon catheters with special features or adapted for special applications
- A61M2025/1081—Balloon catheters with special features or adapted for special applications having sheaths or the like for covering the balloon but not forming a permanent part of the balloon, e.g. retractable, dissolvable or tearable sheaths
Definitions
- the present invention relates to an introducer sheath and a method for using the introducer sheath, and more particularly, to an introducer sheath for introducing a plurality of catheters into a living body lumen and a method for using the introducer sheath.
- a catheter that can be inserted into a living body lumen such as a blood vessel, a bile duct, a trachea, an esophagus, or a urethra is inserted along the living body lumen.
- a catheter is generally introduced into a living body lumen from an approach site formed by puncturing a living body.
- An introducer sheath having a lumen therein is disposed at the approach site, and a catheter is introduced into the living body lumen through the introducer sheath.
- CTO chronic total occlusion
- Patent Document 1 discloses a catheter introduction tool for simultaneously inserting a plurality of catheters into a living body lumen from one approach site.
- This catheter introducer has one introducer sheath and a plurality of hubs, and each hub communicates with a lumen of the introducer sheath via an introduction passage.
- the plurality of catheters respectively inserted into the plurality of hubs are guided into one introducer sheath and introduced into the living body lumen via the lumen in the introducer sheath. For this reason, it is only necessary to form one approach site for the patient, and the burden on the patient can be reduced.
- the lumen of the introducer sheath is formed in such a size that a plurality of catheters can be inserted at the same time, and the outer circumference of the introducer sheath needs to be formed large in accordance with the size of the lumen. For this reason, when using a smaller number of catheters than the number of catheters that can be inserted into the introducer sheath, for example, even when only one catheter is used, the outer peripheral portion of the introducer sheath has a set number of catheters. It has the same size as when used. Since the approach site formed by puncturing the patient is formed according to the size of the introducer sheath, even when a small number of catheters are used, a set number of catheters are used. It is necessary to form an approach site having the same size as that, and there is a problem that the approach site is formed unnecessarily large.
- the present invention has been made to solve such a conventional problem, and an introducer sheath capable of forming an approach site with a size corresponding to the number of catheters to be inserted into a living body lumen.
- the purpose is to provide a method of use.
- An introducer sheath according to the present invention is an introducer sheath for introducing a plurality of catheters into a living body lumen, and includes a sheath body having a deformed portion disposed so as to include at least a part of an outer peripheral portion; A main lumen formed in the sheath main body and a sub-lumen formed to be expandable in the sheath main body are provided, and the deforming portion is deformed to expand outward in accordance with the expansion of the sub-lumen.
- the sub-lumen is preferably formed in the sheath body in a small contracted state and expanded by pressing the inner peripheral surface outward.
- the secondary lumen can be formed in the sheath body in a contracted state, the size of the outer peripheral surface of the introducer can be reduced, and the burden on the patient to be treated when the introducer is inserted into the blood vessel can be reduced.
- the auxiliary lumen can be expanded by a simple operation of inserting a dilator, a balloon catheter or the like into the auxiliary lumen.
- the auxiliary lumen maintains the expanded state even after the pressure for expanding the auxiliary lumen is removed, it is easy to introduce a diagnostic instrument or a therapeutic instrument into the body cavity through the introducer sheath. is there.
- the sheath body preferably has a rigid portion arranged around the main lumen, and the rigid portion preferably has such rigidity that the main lumen is maintained at a predetermined diameter.
- the introducer's rigidity is increased to prevent the introducer from kinking at the time of insertion, and even when the secondary lumen is expanded, the influence of the diameter of the main lumen is suppressed.
- the rigid portion can be arranged so as to completely surround the periphery of the main lumen.
- the rigid portion is disposed so as to surround a portion other than the boundary portion between the main lumen and the sub-lumen, and the boundary portion can be deformed so as to enter the main lumen according to the expansion of the sub-lumen.
- the deforming portion has a folding portion configured to fold at least a part of the inner peripheral surface of the sub-lumen, and the folding of the folding portion is released according to the expansion of the sub-lumen. Therefore, it may be configured to be deformed so as to spread outward. Thereby, the maximum diameter at the time of expansion of the sub-lumen can be set, and the diameter of the sub-lumen can be prevented from becoming larger than necessary at the time of expansion.
- the deforming portion may be configured to fold at least a part of the outer peripheral portion of the sheath body, and may be deformed so as to expand outward by opening the fold according to the extension of the sub-lumen.
- the maximum outer diameter at the time of expansion of a sheath main body can be set, and it can control that the outer diameter of a sheath main body becomes larger than necessary at the time of expansion, and a burden on a treated person becomes large.
- the size of the outer peripheral surface of the sheath main body portion can be reduced, and the burden on the subject when the sheath main body is inserted into the blood vessel can be reduced.
- a partition membrane that traverses the inside of the sheath body may be provided along the sheath body, and the main lumen and the sub lumen may be formed in spaces separated by the partition membrane, respectively.
- the shape of the partition membrane may be linear or curved in the cross section of the sheath body, and the main lumen and the sub lumen can be formed in the sheath body with a simple configuration in which the partition membrane is provided.
- a cylindrical member is disposed along the inner peripheral surface of the sheath body, the main lumen is composed of an internal space of the cylindrical member disposed along the sheath body portion, and the sub lumen is the sheath body portion. You may be comprised from the space between an inner peripheral surface and the outer peripheral surface of a cylindrical member. Thereby, it is easy to set the size of the diameter of the main lumen, and the main lumen and the sub lumen can be formed with a simple configuration.
- the introducer sheath described above is placed in a living body lumen, and the first catheter is placed in the living body lumen through a main lumen formed in the sheath body.
- the expandable sub-lumen in the sheath body and in response to the expansion of the sub-lumen, the deformed portion arranged to include at least a part of the outer periphery of the sheath body expands outward.
- the second catheter is introduced into the living body lumen through the expanded auxiliary lumen.
- the deformed portion arranged so as to include at least a part of the outer peripheral portion of the sheath body is deformed so as to expand outward in accordance with the expansion of the sub-lumen, so that the catheter inserted into the living body lumen It is possible to form an approach site with a size corresponding to the number.
- FIG. 3 is a cross-sectional view of the sheath body of the introducer sheath according to Embodiment 1.
- FIG. 6 is a cross-sectional view showing a state in which the sub-lumen of the sheath body of the introducer sheath according to Embodiment 1 is expanded. It is sectional drawing which shows an example of the sublumen formed in the deformation
- (A) is a figure which shows a mode that a catheter is introduce
- (b) is an intro in the state of Fig.6
- (A) is a figure which shows a mode that a catheter is introduce
- (b) is an intro in the state of Fig.8 (a).
- sheath main-body part of a deducer sheath It is sectional drawing of the sheath main-body part of a deducer sheath.
- the sheath main body of the introducer sheath which concerns on the modification of Embodiment 1 is shown, (a) is sectional drawing which shows the state which inserted the catheter only in the main lumen, (b) inserts the catheter in each of the main lumen and the sub lumen. It is sectional drawing which shows the state which carried out.
- the sheath main body of the introducer sheath which concerns on Embodiment 2 is shown, (a) is sectional drawing which shows the state which inserted the catheter only in the main lumen, (b) is the state which inserted the catheter in the main lumen and the sub-lumen, respectively. It is sectional drawing shown.
- the sheath main body of the introducer sheath which concerns on Embodiment 3 is shown, (a) is sectional drawing which shows the state which inserted the catheter only in the main lumen, (b) is the state which inserted the catheter in the main lumen and the sub-lumen, respectively. It is sectional drawing shown.
- the introducer sheath is a device for securing an access route into the body cavity.
- the hand operation unit side of the device is referred to as “proximal end side”, and the side inserted into the body cavity is referred to as “distal end side”.
- FIG. 1 shows a configuration of an introducer sheath 1 according to Embodiment 1 of the present invention.
- the introducer sheath 1 is provided on a sheath body 6 for inserting two catheters into a blood vessel, two hubs 2 and 3 disposed at the proximal end of the sheath body 6, and hubs 2 and 3, respectively. And three-way stopcocks 4 and 5.
- the sheath body 6 has an elongated shape, and a main lumen 7 and a sub-lumen 8 extending from the proximal end to the distal end are formed in the sheath body 6 as shown in FIG.
- the main lumen 7 communicates with a port 9 formed in the hub 2, and a catheter can be introduced from the port 9 and inserted into the main lumen 7.
- the sub lumen 8 communicates with a port 10 formed in the hub 3.
- a hemostasis valve made of an elastic member is liquid-tightly fixed to the hub 2 and the hub 3 so that blood does not leak from the ports 9 and 10 after the introducer sheath is placed in the blood vessel. It is configured.
- the three-way stopcock 4 is connected to the port 9 of the hub 2 and can fill the main lumen 7 with the solution by injecting heparin or physiological saline using a syringe or the like.
- the three-way stopcock 5 is connected to the port 10 of the hub 3 and can inject heparin or physiological saline into the auxiliary lumen 8.
- a main lumen 7 and a sub-lumen 8 are arranged close to each other.
- the main lumen 7 has such a size that a single catheter can be inserted therein, and is formed so as to occupy most of the inside of the sheath body 6.
- the secondary lumen 8 is formed in a small contracted state so as not to affect the size of the outer peripheral portion of the sheath body 6.
- the auxiliary lumen 8 can be formed small, for example, to such a size that the guide wire passes (diameter is about 0.5 mm).
- the outer peripheral portion of the sheath body 6 can have the same size as when only the main lumen 7 is formed inside.
- a rigid portion 11 is disposed so as to completely surround the periphery of the main lumen 7, and a deformable portion 12 is disposed so as to cover the rigid portion 11.
- the rigid portion 11 has rigidity that supports the sheath body 6 from the inside and maintains the main lumen 7 at a predetermined diameter.
- the rigid portion 11 preferably has a certain degree of flexibility so that it can be curved along the blood vessel.
- the rigid portion 11 can be made of, for example, a metal such as a pseudoelastic alloy, a shape memory alloy, and stainless steel, or a resin such as polyolefin, polyvinyl chloride, and polyamide.
- the deformable portion 12 constitutes the entire outer peripheral portion of the sheath body 6 and the sub-lumen 8 is disposed therein.
- the deformable portion 12 has flexibility to deform in accordance with the expansion of the sub-lumen 8, and when a medical instrument such as a dilator or a catheter is inserted into the sub-lumen 8, the inner surface of the sub-lumen 8 and the outer surface of the medical instrument. And so as to have slidability.
- the auxiliary lumen 8 expands only when the medical instrument is inserted into the auxiliary lumen 8, the burden on the patient is small.
- the deformable portion 12 is deformed so as to expand outward as shown in FIG.
- the outer peripheral portion of the sheath body 6 is expanded outward.
- the secondary lumen 8 can be expanded until it is approximately the same size as the main lumen 7.
- transformation part 12 can be comprised from members which have flexibility, such as natural rubber and a synthetic rubber, for example. At this time, a coating for improving slidability may be applied to the inner peripheral surface of the sub lumen 8.
- the deforming portion 12 may have a flexibility that deforms according to the expansion of the sub-lumen 8 and a plasticity that maintains the expanded state of the sub-lumen 8. Thereby, the sub-lumen 8 expands when the inner peripheral surface is pressed outward, and the expanded state can be maintained to some extent even after the pressing is removed.
- the deforming portion 12 is deformed so as to expand outward, and accordingly, the outer peripheral portion of the sheath body 6 is expanded outward.
- the sub-lumen 8 can be expanded until it is approximately the same size as the main lumen 7.
- the deformable portion 12 can have, for example, a folding portion configured to fold at least a part of the inner peripheral portion of the sub-lumen 8.
- the deformable portion 12 can form a plurality of folded portions 8 a that are folded with the inner peripheral surface of the sub-lumen 8 inside, over the entire circumference of the sub-lumen 8.
- transformation part 12 can be comprised from synthetic resins, such as polyolefin, a polyvinyl chloride, and polyamide, for example.
- the deformable portion 12 does not have the folding portion 8a, by arranging a malleable wire in the deformable portion 12 in the vicinity of the sub lumen 8, the inner surface of the sub lumen 8 is pressed outward.
- the expanded state can be maintained to some extent even after the pressing is removed.
- an approach site S is formed by puncturing only one predetermined site of the patient, and a guide wire Wo1 (mini guide wire) is inserted into the blood vessel V through the approach site S.
- a guide wire Wo1 mini guide wire
- the dilator D1 is inserted into the introducer sheath 1 shown in FIG. 1 from the port 9 formed in the hub 2, and the distal end portion of the dilator D1 is protruded from the distal end of the introducer sheath 1 through the main lumen 7. .
- the introducer sheath 1 to which the dilator D1 is attached is inserted into the blood vessel V along the guide wire Wo1 that has already been inserted into the blood vessel V as shown in FIG.
- the introducer sheath 1 When the introducer sheath 1 is inserted to a predetermined position in the blood vessel V along the guide wire Wo1, the introducer sheath 1 is placed in the blood vessel V, and the dilator D1 and the guide wire Wo1 are pulled out from the introducer sheath 1. It is. Subsequently, another guide wire Wa is introduced from the port 9 of the hub 2, and its distal end is delivered to the vicinity of the target lesion. Then, the first catheter Ka is introduced from the port 9 of the hub 2, and the introduced first catheter Ka is introduced from the distal end of the introducer sheath 1 via the main lumen 7, as shown in FIGS. 6a and 6b. Derived and inserted into the blood vessel V along the guide wire Wa.
- the main lumen 7 has such a size that a single catheter can be inserted, but the sub-lumen 8 is kept in a small contracted state so as not to affect the size of the sheath body 6.
- the outer peripheral part of the sheath main body 6 has substantially the same size as that in the case where only the main lumen 7 is formed therein, that is, substantially the same size as the sheath for inserting one catheter. Therefore, when only the first catheter Ka is inserted into the blood vessel V, it is not necessary to form a large approach site S for inserting two catheters, and it is the same level as when one catheter is inserted.
- the approach site S can be formed with the size L1.
- the first catheter Ka is inserted into the blood vessel V along the guide wire Wa, and the distal end portion is delivered to the target lesion, and the lesion is treated using the first catheter Ka. It can be carried out.
- the main lumen 7 can be filled by injecting a solution such as heparin from the three-way stopcock 4. For example, by filling the main lumen 7 with heparin, blood flowing into the main lumen 7 is coagulated. Can be suppressed.
- the guide wire Wo2 (into the sub lumen 8 of the introducer sheath 1 from the port 10 formed in the hub 3 of the sheath assembly.
- the mini guide wire is inserted, and the dilator D2 is inserted along the guide wire Wo2, and the guide wire Wo2 and the dilator D2 are led out from the tip of the introducer sheath 1 as shown in FIG.
- the dilator D ⁇ b> 2 is inserted into the introducer sheath 1 while pressing the inner peripheral surface of the sheath body 6 so as to spread the auxiliary lumen 8.
- the secondary lumen 8 is expanded to approximately the same size as the main lumen 7, and in accordance with the expansion of the secondary lumen 8, the deformable portion 12 is deformed so as to expand outward and the outer peripheral portion of the sheath body 6 is pushed outward. spread. For this reason, the outer peripheral part of the sheath body 6 is greatly deformed, and the approach site S formed in the patient to be treated is also expanded in accordance with the deformation.
- the dilator D2 was used in order to expand the auxiliary
- the secondary lumen 8 is flexible and has a high slidability on the inner peripheral surface thereof, so that the catheter Kb can be smoothly inserted even after the dilator D2 is removed.
- the second catheter Kb introduced from the port 10 of the hub 3 does not receive a large pressure from the inner peripheral surface of the deformable portion 12 constituting the auxiliary lumen 8, and is smoothly inserted into the auxiliary lumen 8. I can go. In this way, the second catheter Kb is led out from the distal end of the introducer sheath 1 via the expanded secondary lumen 8, as shown in FIGS. 8a and 8b, and into the blood vessel V along the guide wire Wb. It will be inserted.
- the outer peripheral portion of the introducer sheath 1 is pushed outward by an amount corresponding to the expansion of the sub-lumen 8, it is not expanded more than necessary, and a sheath for inserting two catheters is provided. It is almost the same size.
- the approach site S formed in the treatment subject is formed to have approximately the same size L2 as when two catheters are inserted, and it is not necessary to expand to a larger size.
- the second catheter Kb is inserted into the blood vessel V along the guide wire Wb, and the distal end thereof is delivered to the target lesion, and the first catheter Ka and the second catheter Kb 2
- the lesion can be treated using a catheter of the book. In addition, it can suppress that the blood which inject
- the size of the outer periphery of the introducer sheath 1 can be changed according to the number of catheters inserted into the blood vessel V. For this reason, the size of the approach site S formed by puncturing the person to be treated is the size of one when inserting a single catheter, and the size of two when inserting two catheters. The approach site S need not be formed unnecessarily large, and the burden on the patient can be reduced.
- the deforming portion 12 is formed so as to constitute the entire outer peripheral portion of the sheath main body 6, but the outer peripheral portion of the sheath main body 6 is expanded outward in accordance with the expansion of the sub-lumen 8. It is only necessary to be able to be formed, and it is sufficient that the sheath body 6 is formed so as to include a part of the outer peripheral portion.
- one main lumen 7 and one sub-lumen 8 are formed in the sheath body 6, but a plurality of catheters are used depending on the number of catheters used for treating a lesion in a blood vessel. Can form a lumen.
- a plurality of auxiliary lumens 8 can be formed for one main lumen 7.
- the rigid portion 11 is disposed so as to completely surround the periphery of the main lumen 7, but it is sufficient if the main lumen 7 can be maintained in a size that allows the first catheter Ka to be inserted.
- the rigid portion 11 of the first embodiment instead of the rigid portion 11 of the first embodiment, a rigid portion 14 surrounding the main lumen 7 and surrounding the portion other than the boundary portion 13 between the main lumen 7 and the sub lumen 8 is arranged.
- the deformable portion 15 is arranged so as to cover the rigid portion 14 and include the boundary portion 13.
- the outer peripheral portion of the sheath body 6 is deformed so as to expand outward in accordance with the expansion, and the boundary portion 13 enters the main lumen 7. It deforms as follows. That is, the boundary portion 13 is deformed so as to expand outward in accordance with the expansion of the sub-lumen 8, and is also deformed so as to narrow the size of the main lumen 7 by expanding to the main lumen 7 side.
- the second catheter Kb can be inserted into the expanded secondary lumen 8, and the second catheter Kb led out from the introducer sheath 1 through the secondary lumen 8 is inserted into the blood vessel. Can be inserted into V.
- the outer peripheral part of the sheath body 6 is expanded outward in response to the expansion of the sub-lumen 8, but also the boundary portion 13 is expanded toward the main lumen 7, so that when two catheters are inserted,
- the outer peripheral part of the introducer sheath 1 can be made smaller. For this reason, the size of the approach site S formed in the patient can also be reduced, and the burden on the patient can be further reduced.
- the deformable portion 12 having flexibility so as to be deformed according to the expansion of the sub-lumen 8 is arranged in the sheath body 6. It is not limited to this as long as it can be spread outward.
- the sheath body 21 has a deformed portion 22 in which a part of the outer peripheral portion is folded, and the deformed portion 22 opens the fold according to the expansion of the sub lumen 8,
- the outer peripheral part of the sheath main body 21 can be expanded outside.
- the rigid portion 23 is disposed so as to surround the entire outer peripheral portion of the sheath body 21, and the deformable portion 22 is disposed in a part of the rigid portion 23.
- the rigid portion 23 has such rigidity that the sheath body 21 is supported from the outside when the sheath body 21 is inserted into the blood vessel, for example, a metal such as a pseudoelastic alloy, a shape memory alloy and stainless steel, or It can be comprised from resin, such as polyolefin, polyvinyl chloride, and polyamide.
- the rigid portion 23 preferably has a certain degree of flexibility so as to bend along the blood vessel.
- the deformation part 22 is configured by folding the rigid part 23 inward so as to overlap each other.
- the overlapping portions of the rigid portion 23 are bonded to each other so that the folding is not released.
- the bonding is released and the folding of the deformable portion 22 is released. be able to.
- a partition membrane 24 that traverses the inside of the rigid portion 23 is provided along the sheath body 21, and the interior of the sheath body 21 is divided into the main lumen 7 and the sub-lumen 8 by the partition membrane 24. That is, the main lumen and the sub-lumen are respectively formed in the space divided by the partition film 24.
- the main lumen 7 has a size that allows the first catheter Ka to be inserted, and is formed so as to occupy most of the sheath body 21.
- the sub lumen 8 is formed in a small contracted state so that the deformation of the deformable portion 22 does not affect the size of the outer peripheral portion of the sheath body 21.
- the sub-lumen 8 can be formed small enough to pass through the guide wire (diameter is about 0.5 mm).
- the size of the main lumen 7 and the sub-lumen 8 in a state where the folding of the deformable portion 22 is released can be changed depending on the position of the partition film 24.
- the sizes of the main lumen 7 and the sub lumen 8 in the state where the folding is opened are approximately the same. become.
- the separator 24 only needs to be strong or flexible enough not to be damaged by insertion of a medical device such as a dilator or a catheter, and can be made of a synthetic resin such as polyolefin, polyvinyl chloride, and polyamide.
- the partition film 24 Since the partition film 24 has strength or flexibility that is not broken in response to the expansion of the sub-lumen 8, the inner peripheral surface of the rigid portion 23 is outside by the medical instrument inserted into the sub-lumen 8.
- the rigid portion 23 When the rigid portion 23 is pressed at a predetermined pressure, the deformable portion 22 is unfolded and the auxiliary lumen 8 expands.
- the deformed portion 22 In response to the expansion of the sub-lumen 8, the deformed portion 22 is deformed so as to expand outward, and the outer peripheral portion of the sheath body 21 is expanded outward. Thereby, according to expansion of the sub lumen 8, the outer peripheral part of the sheath main body 21 can be pushed outward.
- the sub lumen 8 is approximately the same size as the main lumen 7, as shown in FIG.
- a second catheter Kb having the same size as the first catheter Ka inserted into the main lumen 7 can be inserted into the expanded secondary lumen 8.
- the introducer sheath 1 since the size of the outer peripheral portion of the introducer sheath 1 can be changed according to the number of catheters inserted into the blood vessel V, the introducer sheath 1 is formed by puncturing the subject. There is no need to unnecessarily increase the size of the approach site S, and the burden on the patient can be reduced. Further, since the rigid portion 23 is disposed so as to surround the entire outer peripheral portion of the sheath body 21, the piercing property of the introducer sheath 1 can be improved, and the introducer sheath 1 can be smoothly moved from the approach site S into the blood vessel. Can be inserted into.
- Embodiment 3 in the introducer sheath having the structure as in the second embodiment, even if the separator membrane 24 is not used and the configuration is as shown in FIG. An introducer sheath that can be formed can be constructed.
- the separator 24 is removed from the sheath body 21 of the second embodiment, and a cylindrical member 25 is provided inside the rigid portion 23 along the inner peripheral surface of the sheath body 21.
- the main lumen 7 is formed in the internal space of the tubular member 25.
- the sub lumen 8 is formed by a space formed between the outer periphery of the tubular member 25 and the inner periphery of the rigid portion 23.
- the rigid portion 23 is disposed so as to cover the outer periphery of the tubular member 25 when the deformable portion 22 is folded. Therefore, even when the deforming portion 22 is folded, the main lumen 7 has such a size that the first catheter Ka can be inserted, and is formed so as to occupy most of the sheath body 21.
- the sub lumen 8 is formed in a small contracted state so that the deformation of the deformable portion 22 does not affect the size of the outer peripheral portion of the sheath body 21.
- the sub-lumen 8 can be formed small enough to pass through the guide wire (diameter is about 0.5 mm).
- the cylindrical member has such a rigidity that it is not crushed in accordance with the expansion of the sub-lumen 8.
- a metal such as a pseudoelastic alloy, a shape memory alloy and stainless steel, or a polyolefin, polyvinyl chloride, and It can be composed of a resin such as polyamide.
- the rigid portion 23 preferably has a certain degree of flexibility so as to bend along the blood vessel.
- the inner peripheral surface of the rigid portion 23 is pressed outward by the medical instrument inserted into the sub-lumen 8.
- the rigid portion 23 is pressed with a predetermined pressure
- the deformable portion 22 is unfolded and the sub-lumen 8 is expanded.
- the deformed portion 22 is deformed so as to expand outward, and the outer peripheral portion of the sheath body 21 is pushed outward.
- the outer peripheral part of the sheath main body 21 can be pushed outward.
- the size of the outer peripheral portion of the introducer sheath 1 can be changed according to the number of catheters inserted into the blood vessel V. It is not necessary to unnecessarily increase the size of the approach site S formed by puncturing the person, and the burden on the patient can be reduced. Further, since the rigid portion 23 is disposed so as to surround the entire outer peripheral portion of the sheath body 21, the piercing property of the introducer sheath 1 can be improved, and the introducer sheath 1 can be smoothly moved from the approach site S into the blood vessel. Can be inserted into.
- the rigid part 23 of Embodiment 2 and Embodiment 3 should just be comprised so that folding of the deformation
- the material can be made of a material having a somewhat low rigidity.
- the introducer sheath 1 is used to introduce a catheter into the blood vessel of the patient.
- the introducer sheath 1 is not disposed in a biological lumen such as a bile duct, trachea, esophagus, or urethra. It can also be used to introduce a catheter.
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Abstract
Description
また、変形部は、副ルーメンの拡張に応じて変形し且つ副ルーメンの拡張状態を保つように構成してもよい。これにより、副ルーメンは、副ルーメンの拡張するための押圧が除かれた後でも拡張状態を維持するため、診断用器具や治療用器具などをイントロデューサシースを通して体腔内に導入するのが容易である。
この際、剛性部は、主要ルーメンの周囲を完全に囲むように配置することができる。また、剛性部は、主要ルーメンと副ルーメンの境界部以外の部分を囲んで配置され、境界部は、副ルーメンの拡張に応じて主要ルーメン内に入り込むように変形することもできる。
また、シース本体の内周面に沿って筒状部材が配置され、主要ルーメンはシース本体部に沿って配置された筒状部材の内部空間から構成されており、前記副ルーメンはシース本体部の内周面と筒状部材の外周面の間の空間から構成されていてもよい。これにより、主要ルーメンの径の大きさを設定しやすく、かつ、簡単な構成で主要ルーメンと副ルーメンを形成することができる。
図1に、この発明の実施の形態1に係るイントロデューサシース1の構成を示す。このイントロデューサシース1は、血管内に2本のカテーテルを挿入するためのシース本体6と、シース本体6の基端に配置された2つのハブ2および3と、ハブ2および3にそれぞれ設けられた三方活栓4および5とを有する。
三方活栓4は、ハブ2のポート9に接続されており、シリンジ等を用いてヘパリンや生理食塩水を注入して主要ルーメン7内をその溶液で満たすことができる。同様に、三方活栓5は、ハブ3のポート10に接続されており、ヘパリンや生理食塩水を副ルーメン8内に注入することができる。
シース本体6内には、図2に示すように、主要ルーメン7と副ルーメン8が互いに近接して配置されている。主要ルーメン7は、内部に1本のカテーテルを挿入できるような大きさを有し、シース本体6内のほとんどの部分を占めるように形成されている。一方、副ルーメン8は、シース本体6の外周部の大きさに影響しないように、小さく収縮した状態で形成されている。副ルーメン8は、例えば、ガイドワイヤが通る程度の大きさ(直径が約0.5mm)に小さく形成することができる。このように、副ルーメン8を小さく収縮した状態で形成することにより、シース本体6の外周部は、内部に主要ルーメン7のみを形成した場合と同程度の大きさを有することができる。
まず、被治療者の所定の部位を1箇所だけ穿刺してアプローチサイトSを形成し、このアプローチサイトSを介して血管V内にガイドワイヤWo1(ミニガイドワイヤ)が挿入される。一方、図1に示したイントロデューサシース1には、ハブ2に形成されたポート9からダイレータD1が挿入され、主要ルーメン7を介してダイレータD1の先端部をイントロデューサシース1の先端から突出させる。このようにして、ダイレータD1が装着されたイントロデューサシース1は、既に血管V内に挿入されているガイドワイヤWo1に沿って、図5に示すように、血管V内に挿入される。
なお、副ルーメン8を拡張させるためにダイレータD2を用いたが、副ルーメン8を拡張できればよく、例えばバルーンカテーテルなどの拡張具を用いてもよい。
このようにして、第2のカテーテルKbをガイドワイヤWbに沿って血管V内に挿入して、その先端部を目的の病変部まで送達させ、第1のカテーテルKaと第2のカテーテルKbの2本のカテーテルを用いて病変部を治療することができる。なお、三方活栓5からヘパリン等の溶液を注入して副ルーメン8内に流入した血液が凝固するのを抑制することができる。
また、上記の実施の形態では、シース本体6の内部に主要ルーメン7と副ルーメン8がそれぞれ1つずつ形成されていたが、血管内の病変部の治療に使用するカテーテルの本数に応じて複数のルーメンを形成することができる。例えば、1つの主要ルーメン7に対して、複数の副ルーメン8を形成することができる。
例えば、図9aに示すように、実施の形態1の剛性部11に換えて、主要ルーメン7の周囲において主要ルーメン7と副ルーメン8の境界部13以外の部分を囲むような剛性部14を配置することができ、この剛性部14を覆うと共に境界部13を含むように変形部15を配置する。これにより、副ルーメン8内にダイレータDを挿入して拡張させると、その拡張に応じて、シース本体6の外周部が外側に拡がるように変形すると共に、境界部13が主要ルーメン7内に入り込むように変形する。すなわち、境界部13は、副ルーメン8の拡張に応じて、外側に拡がるように変形する一方で、主要ルーメン7側にも拡がることにより主要ルーメン7の大きさを狭めるように変形する。拡張された副ルーメン8内には、図9bに示すように、第2のカテーテルKbを挿入することができ、副ルーメン8を介してイントロデューサシース1から導出された第2のカテーテルKbを血管V内に挿入することができる。
実施の形態1では、副ルーメン8の拡張に応じて変形するような柔軟性を有する変形部12がシース本体6に配置されたが、副ルーメン8の拡張に応じてシース本体6の外周部を外側に拡げることができればよく、これに限るものではない。
例えば、図10aに示すように、シース本体21は、一部の外周部が折り畳まれた変形部22を有し、この変形部22が副ルーメン8の拡張に応じて折り畳みを開放することで、シース本体21の外周部を外側に拡げることができる。具体的には、シース本体21の外周部全体を囲むように剛性部23を配置し、この剛性部23の一部に変形部22が配置されている。剛性部23は、シース本体21が血管内に挿入される際にシース本体21を外側から支持するような剛性を有し、例えば、擬弾性合金、形状記憶合金およびステンレス鋼などの金属、または、ポリオレフィン、ポリ塩化ビニルおよびポリアミドなどの樹脂から構成することができる。なお、剛性部23は、血管に沿って湾曲できるように、ある程度の可撓性を有するのが好ましい。
また、剛性部23の内部を横断する区切り膜24がシース本体21に沿って設けられており、区切り膜24によってシース本体21の内部が主要ルーメン7と副ルーメン8に分けられている。すなわち、主要ルーメンと副ルーメンは、区切り膜24により分けられた空間内にそれぞれ形成されることになる。変形部22が折り畳まれた状態において、主要ルーメン7は、第1のカテーテルKaが挿入できる大きさを有し、シース本体21内のほとんどを占めるように形成されている。一方、副ルーメン8は、変形部22の折り畳みにより、シース本体21の外周部の大きさに影響しないように、小さく収縮した状態で形成される。例えば、副ルーメン8は、ガイドワイヤが通る程度の大きさ(直径が約0.5mm)に小さく形成することができる。
例えば、シース本体21の断面において、その断面の形状の中点を通る直線状の区切り膜24を設けた場合には、図10bに示すように、副ルーメン8は、主要ルーメン7とほぼ同じ大きさに拡張することができ、拡張された副ルーメン8内に、主要ルーメン7に挿入された第1のカテーテルKaと同じ大きさの第2のカテーテルKbを挿入することができる。
また、実施の形態2のような構造を持つイントロデューサシースにおいて、区切り膜24を用いず、図11aのように構成しても、副ルーメン8の拡張により、カテーテルが挿入可能な2つのルーメンを形成できるイントロデューサシースを構成できる。
図11aでは、実施の形態2のシース本体21に対して、区切り膜24を除くと共に、剛性部23の内側に、シース本体21の内周面に沿って筒状部材25が設けられており、筒状部材25の内部空間に主要ルーメン7が形成されている。そして、筒状部材25の外周と剛性部23の内周との間にできる空間により副ルーメン8が形成される。
Claims (9)
- 生体管腔内に複数のカテーテルを導入するためのイントロデューサシースであって、
少なくとも一部の外周部を含むように配置された変形部を有するシース本体と、
前記シース本体内に形成された主要ルーメンと、
前記シース本体内に拡張可能に形成された副ルーメンと
を備え、
前記変形部は、前記副ルーメンの拡張に応じて、外側に拡がるように変形することを特徴とするイントロデューサシース。 - 前記副ルーメンは、小さく収縮した状態で前記シース本体内に形成され、内周面が外側に押圧されることにより拡張する請求項1に記載のイントロデューサシース。
- 前記副ルーメンは前記変形部内に形成され、前記変形部は、前記副ルーメンの拡張に応じて変形した際に、前記副ルーメンの拡張状態を保つように構成される請求項1または2に記載のイントロデューサシース。
- 前記変形部は、前記副ルーメンの少なくとも一部の内周部を折り畳むように構成された折畳部を有し、前記副ルーメンの拡張に応じて前記折畳部の折り畳みが開放されることにより、外側に拡がるように変形する請求項3に記載のイントロデューサシース。
- 前記変形部は、前記シース本体の前記少なくとも一部の外周部を折り畳むように構成され、前記副ルーメンの拡張に応じて折り畳みを開放することにより外側に拡がるように変形する請求項1又は2に記載のイントロデューサシース。
- 前記変形部は、前記副ルーメンの拡張に応じて変形し、かつ、前記副ルーメンの拡張状態を保つように構成される請求項5に記載のイントロデューサシース。
- 前記シース本体の内部を横断する区切り膜がシース本体に沿って設けられ、
前記主要ルーメンと前記副ルーメンは、区切り膜により分けられた空間内にそれぞれ形成されている請求項6に記載のイントロデューサシース。 - 前記シース本体の内周面に沿って筒状部材が配置され、
前記主要ルーメンは前記筒状部材の内部空間から構成されており、前記副ルーメンは前記シース本体の内周面と前記筒状部材の外周面の間の空間から構成される請求項6に記載のイントロデューサシース。 - 請求項1~8のいずれか一項に記載のイントロデューサシースを生体管腔内に留置し、
シース本体内に形成された主要ルーメンを介して第1のカテーテルを生体管腔内に導入し、
シース本体内に拡張可能に形成された副ルーメンを拡張し、
前記副ルーメンの拡張に応じて、前記シース本体の少なくとも一部の外周部を含むように配置された変形部が外側に拡がるように変形し、
拡張された前記副ルーメンを介して第2のカテーテルを生体管腔内に導入することを特徴とするイントロデューサシースの使用方法。
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CN114470477A (zh) * | 2020-01-17 | 2022-05-13 | 浙江医高医疗科技有限公司 | 一种改进的输尿管扩张器 |
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KR20220072847A (ko) * | 2019-09-30 | 2022-06-02 | 아비오메드, 인크. | 가단성 시스 몸체 |
CN115531689A (zh) * | 2022-08-31 | 2022-12-30 | 湖南省华芯医疗器械有限公司 | 一种输尿管鞘的前端组件、输尿管鞘及插入输尿管的设备 |
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