WO2022219859A1 - 医療用チューブおよびカテーテル - Google Patents
医療用チューブおよびカテーテル Download PDFInfo
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- WO2022219859A1 WO2022219859A1 PCT/JP2022/000381 JP2022000381W WO2022219859A1 WO 2022219859 A1 WO2022219859 A1 WO 2022219859A1 JP 2022000381 W JP2022000381 W JP 2022000381W WO 2022219859 A1 WO2022219859 A1 WO 2022219859A1
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- WIPO (PCT)
- Prior art keywords
- core layer
- medical tube
- hollow shaft
- specific configuration
- medical
- Prior art date
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- 229920005989 resin Polymers 0.000 claims abstract description 69
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- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims abstract description 16
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Images
Classifications
-
- 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
-
- 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
- A61M25/0043—Catheters; Hollow probes characterised by structural features
-
- 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
- A61M25/0043—Catheters; Hollow probes characterised by structural features
- A61M25/0045—Catheters; Hollow probes characterised by structural features multi-layered, e.g. coated
-
- 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
- A61M25/0043—Catheters; Hollow probes characterised by structural features
- A61M25/005—Catheters; Hollow probes characterised by structural features with embedded materials for reinforcement, e.g. wires, coils, braids
-
- 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
- A61M25/0043—Catheters; Hollow probes characterised by structural features
- A61M2025/006—Catheters; Hollow probes characterised by structural features having a special surface topography or special surface properties, e.g. roughened or knurled surface
Definitions
- the technology disclosed in this specification relates to medical tubes and catheters.
- a catheter is a long medical device that is used by being inserted into the human body's tubular organs such as blood vessels, gastrointestinal tracts, and urinary tracts, and body tissues.
- a catheter includes, for example, a tubular hollow shaft, a distal tip joined to the distal side of the hollow shaft, and a connector joined to the proximal side of the hollow shaft.
- the hollow shaft includes, for example, a tubular core layer and an outer layer arranged around the core layer.
- the core layer is made of a resin (for example, a fluororesin) having excellent lubricity and chemical resistance.
- the outer layer is made of a resin (for example, polyamide-based resin) having excellent moldability and flexibility.
- the hollow shaft of the catheter is required to be highly flexible in order to prevent damage to the inner wall of the blood vessel and to improve blood vessel selectivity.
- a technique of providing an uneven structure having a plurality of projections projecting radially inward and recesses surrounding the plurality of projections in a core layer of a hollow shaft is known (see, for example, Patent Document 1).
- the term “stretch resistance” refers to the ability of an object to resist stretching and resist stretching.
- the inventors of the present application have found that if the hollow shaft has low stretch resistance, for example, when the proximal end of the catheter is pulled proximally in order to withdraw the catheter from the body, the hollow shaft stretches and the catheter does not move. It has been found that if the end portion is pulled further proximally, the catheter behaves unfavorably such that the catheter bounces and moves proximally, thereby reducing the operability of the catheter. In recent years, in particular, there has been a demand for thinner hollow shafts in order to reduce the burden on patients and to ensure the size of the lumen for inserting medical devices such as guide wires. is considered to be a problem.
- the conventional techniques described above can improve the flexibility of the hollow shaft of the catheter, no consideration is given to the stretch resistance of the hollow shaft.
- the conventional technique described above has a problem that it is impossible to achieve both flexibility and stretch resistance of the hollow shaft of the catheter at a high level. Such a problem is not limited to hollow shafts constituting catheters, but is common to medical tubes in general.
- This specification discloses a technology capable of solving the above-described problems.
- the medical tube disclosed in the present specification is composed of a tubular core layer and a resin, is arranged on the outer periphery of the core layer, and has an outer peripheral surface substantially parallel to the axial direction of the medical tube. and an outer layer having The core layer has a tubular inner core layer made of a fluororesin and an outer core layer made of a resin having a Young's modulus higher than that of the fluororesin and disposed on the outer periphery of the inner core layer. .
- peaks protruding outward in the radial direction of the medical tube and valleys protruding radially inward of the medical tube are repeatedly arranged in the axial direction of the medical tube. has a specific configuration.
- the core layer has an outer core layer made of a resin having a higher Young's modulus than that of the fluorine-based resin in addition to the inner core layer made of the fluorine-based resin. It has elasticity.
- the core layer since the core layer has a specific configuration in which peaks and valleys are repeatedly arranged, the medical tube has high flexibility even though the core layer has an outer core layer. Therefore, according to the present medical tube, both flexibility and stretch resistance of the medical tube can be achieved at a high level.
- the core layer of the present medical tube has a specific configuration in which peaks and valleys are repeatedly arranged, the inner peripheral portion of the medical tube and other medical devices inserted through the medical tube As a result, the medical device can be smoothly advanced and retracted with respect to the medical tube, and operability can be improved.
- the specific configuration includes an intersection portion where ridgelines of two ridges aligned in the axial direction of the medical tube intersect to form one ridgeline of the ridges.
- the outer diameter of the medical tube may be 5 mm or less. According to this medical tube, the flexibility of the medical tube can be improved by imparting a specific configuration to the core layer even in a medical tube that is difficult to process due to its extremely small outer diameter.
- the core layer may have the specific configuration in a portion in the axial direction of the medical tube, and may not have the specific configuration in the remaining portion. According to the present medical tube, it is possible to improve the flexibility of the portion of the medical tube that particularly requires flexibility while ensuring high stretch resistance as a whole, thereby imparting the desired performance to the medical tube. be able to.
- the core layer may have the specific configuration in a portion including the tip of the core layer, and may not have the specific configuration in the remaining portion. According to this medical tube, it is possible to improve the flexibility of the distal end portion where flexibility is particularly required in the medical tube while ensuring high stretch resistance as a whole.
- the outer core layer may be thinner than the inner core layer. According to this medical tube, it is possible to suppress a decrease in the flexibility of the medical tube due to the provision of the outer core layer in the core layer, and to improve the flexibility and stretch resistance of the medical tube to a higher level. can be reconciled with
- Explanatory drawing schematically showing the configuration of the catheter 10 according to the present embodiment.
- Explanatory drawing showing the detailed configuration of the hollow shaft 100 Explanatory drawing showing the detailed configuration of the hollow shaft 100
- SC Explanatory diagram showing performance evaluation results
- FIG. 1 is an explanatory diagram schematically showing the configuration of a catheter 10 according to this embodiment.
- FIG. 1 shows the side view configuration of catheter 10 .
- illustration of a part of the configuration of the catheter 10 is omitted for the sake of convenience.
- the Z-axis positive direction side is the tip side (distal side) inserted into the body
- the Z-axis negative direction side is the proximal side (proximal side) operated by an operator such as a doctor.
- FIG. 1 shows the catheter 10 as a whole in a straight line parallel to the Z-axis direction, the catheter 10 has flexibility to the extent that it can be curved.
- distal end of the catheter 10 and its constituent members is referred to as the "distal end,” the distal end and its vicinity as the “distal portion,” and the proximal end as the “proximal end.”
- proximal end and its vicinity are referred to as the "base end”.
- the catheter 10 is an elongated medical device that is used by being inserted into human body tubular organs such as blood vessels, gastrointestinal tracts, and urinary tracts, and body tissues.
- the total length of the catheter 10 is, for example, approximately 1500 mm.
- Catheter 10 comprises hollow shaft 100 , flexible distal tip 20 connected to the distal end of hollow shaft 100 , and connector 30 connected to the proximal end of hollow shaft 100 .
- the hollow shaft 100 is an example of a medical tube in the claims.
- FIG. 2 and 3 are explanatory diagrams showing the detailed configuration of the hollow shaft 100.
- FIG. 2 shows an enlarged cross-sectional configuration of the X1 part of FIG. 1 (cross-sectional configuration including the central axis AX of the hollow shaft 100)
- FIG. 3 shows the cross-sectional configuration of the X2 part of FIG.
- a configuration of a cross section including the central axis AX of the hollow shaft 100) is shown enlarged.
- the hollow shaft 100 is a tubular (for example, cylindrical) member with openings at the distal end and the proximal end.
- tubular (cylindrical) is not limited to a complete tube shape (cylindrical shape), but generally a substantially tubular shape (substantially cylindrical shape, for example, a slightly conical shape, a partial It means that it is a shape with unevenness, etc.).
- a hollow portion of the hollow shaft 100 functions as a lumen 102 for inserting a medical device such as a guide wire.
- the outer diameter of the hollow shaft 100 is 0.1 mm or more and 5.0 mm or less.
- the outer diameter of the hollow shaft 100 is more preferably 0.5 mm or more and 3.0 mm or less.
- the hollow shaft 100 is composed of a tubular core layer 130 and an outer layer 140 arranged around the core layer 130 .
- the outer layer 140 is arranged so as to cover the entire outer circumference of the core layer 130 .
- the outer layer 140 is arranged so as to be in contact with the outer peripheral surface of the core layer 130 .
- another member for example, a reinforcing member such as a braid in which a plurality of wires are woven together
- a reinforcing member such as a braid in which a plurality of wires are woven together
- the outer layer 140 has an outer peripheral surface substantially parallel to the axial direction (Z-axis direction) of the hollow shaft 100 .
- the outer layer 140 constitutes the outermost layer of the hollow shaft 100 , so the hollow shaft 100 also has an outer peripheral surface substantially parallel to the axial direction of the hollow shaft 100 .
- the outer layer 140 is made of resin.
- a polyamide-based resin for example, a polyamide-based resin, a polyester-based resin, a polyurethane-based resin, a polyolefin-based resin, an aromatic polyetherketone-based resin, a polycarbonate-based resin, or the like can be used. These may use only 1 type and may use 2 or more types together.
- polyamide-based resins include polyamides and polyamide elastomers.
- polyurethane-based resins include polyurethanes and polyurethane elastomers.
- polyester-based resins include polybutylene terephthalate and polyester elastomers.
- polyolefin resins examples include polyethylene, polypropylene, and ethylene-propylene copolymers.
- Polyetheretherketone (PEEK) can be exemplified as the aromatic polyetherketone-based resin.
- the outer layer 140 preferably contains a polyamide-based resin or a polyurethane-based resin, and more preferably contains a polyamide-based resin.
- the outer layer 140 may contain optional components other than the polyamide-based resin and the polyurethane-based resin, but preferably contains 90% by mass or more of the polyamide-based resin and the polyurethane-based resin. Moreover, it is more preferable to contain 90 mass % or more of polyamide-based resins.
- the Young's modulus of the resin forming the outer layer 140 is not particularly limited, it is preferably lower than the Young's modulus of the resin (resin having a Young's modulus higher than that of the fluorine-based resin) forming the outer core layer 120 described later. Moreover, the Young's modulus of the resin forming the outer layer 140 is preferably less than 1.0 GPa from the viewpoint of ensuring flexibility.
- the Young's modulus of the resin forming the outer layer 140 can be obtained by preparing a test piece according to JIS K 7161 and measuring it.
- the thickness t4 of the outer layer 140 (which is the average thickness; hereinafter, the thickness is the same unless otherwise specified) is preferably, for example, 10 ⁇ m or more from the viewpoint of ensuring the rigidity of the hollow shaft 100. , more preferably 15 ⁇ m or more, more preferably 30 ⁇ m or more.
- the thickness t4 of the outer layer 140 is, for example, 700 ⁇ m from the viewpoint of reducing the outer diameter of the hollow shaft 100 while ensuring the inner diameter of the lumen 102 by suppressing the thickness of the hollow shaft 100 from becoming excessively large. It is preferably 350 ⁇ m or less, more preferably 200 ⁇ m or less.
- the thickness t4 of the outer layer 140 is thicker than the thickness t3 of the core layer 130 .
- thickness t4 of outer layer 140 may be thinner than thickness t3 of core layer 130 .
- the thickness of the relatively thin portion of the outer layer 140 (the portion facing the peak portion 130A described later) may be, for example, 5 ⁇ m or more and 100 ⁇ m or less, 15 ⁇ m or more and 80 ⁇ m or less, 20 ⁇ m or more, It may be 60 ⁇ m or less.
- the thickness of the relatively thick portion of the outer layer 140 may be, for example, 50 ⁇ m or more and 800 ⁇ m or less, 60 ⁇ m or more and 600 ⁇ m or less, 70 ⁇ m or more, It may be 400 ⁇ m or less.
- the core layer 130 is composed of a tubular inner core layer 110 and an outer core layer 120 arranged on the outer periphery of the inner core layer 110 . That is, the hollow shaft 100 of this embodiment is a three-layered tube in which the inner core layer 110 constitutes the innermost layer and the outer layer 140 constitutes the outermost layer.
- the outer core layer 120 is arranged so as to cover the entire outer periphery of the inner core layer 110 . In this embodiment, the outer core layer 120 is arranged so as to be in contact with the outer peripheral surface of the inner core layer 110 .
- the inner core layer 110 is made of a fluororesin, which is a resin with excellent lubricity and chemical resistance.
- the fluorine-based resin is a general term for synthetic resins containing fluorine, and includes thermoplastic resins containing fluorine, fluoroelastomers, and the like.
- fluorine-based resins include PTFE (polytetrafluoroethylene), PFA (tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer), FEP (tetrafluoroethylene-hexafluoropropylene copolymer), ETFE (ethylene-tetra fluoroethylene copolymer) and the like.
- the fact that the inner core layer 110 is made of a fluorine-based resin means that the inner core layer 110 contains 90% by mass or more of the fluorine-based resin, although the inner core layer 110 may contain optional components other than the fluorine-based resin.
- the thickness t1 of the inner core layer 110 is preferably, for example, 3 ⁇ m or more, more preferably 5 ⁇ m or more, and more preferably 7 ⁇ m or more, from the viewpoint of ensuring lubricity and chemical resistance of the inner surface. More preferred.
- the thickness t1 of the inner core layer 110 is 30 ⁇ m from the viewpoint of suppressing an excessive thickness of the hollow shaft 100 and reducing the outer diameter of the hollow shaft 100 while securing the inner diameter of the lumen 102. It is preferably 20 ⁇ m or less, more preferably 15 ⁇ m or less.
- the Young's modulus of the fluorine-based resin forming the inner core layer 110 is preferably less than 1.0 GPa, more preferably 500 MPa or less.
- the Young's modulus of the fluorine-based resin forming the inner core layer 110 may be 200 MPa or less.
- the Young's modulus of the fluorine-based resin forming the inner core layer 110 can be measured according to JIS K 7161.
- the outer core layer 120 is made of a resin having a higher Young's modulus than that of a fluororesin (hereinafter referred to as "high Young's modulus resin").
- the Young's modulus of the high Young's modulus resin forming the outer core layer 120 is preferably, for example, 1.0 GPa or more.
- high Young's modulus resins include polyimide-based resins, aromatic polyetherketone-based resins such as PEEK, and polyamide-based resins having a high Young's modulus such as TR55.
- a polyimide resin is a polymer having an imide bond in its main chain, and includes polyimide, polyamideimide, polyesterimide, polyetherimide, and the like.
- polyimide-based resins it is preferable to use polyimide, which is particularly excellent in mechanical properties, and among polyimides, it is more preferable to use aromatic polyimide.
- the aromatic polyimide may be thermoplastic or non-thermoplastic.
- the expression that the outer core layer 120 is composed of a high Young's modulus resin means that the outer core layer 120 may contain optional components other than the high Young's modulus resin, but the high Young's modulus resin is 90% by mass or more. means to contain Further, it is preferable that the resin forming the outer core layer 120 has a higher Young's modulus than the resin forming the outer layer 140 .
- the Young's modulus of the high Young's modulus resin is more preferably 1.5 GPa or more, more preferably 2.0 GPa or more. Moreover, the Young's modulus of the high Young's modulus resin may be 2.5 GPa or more. The Young's modulus of the high Young's modulus resin can be measured according to JIS K 7161.
- the outer core layer 120 has resistance to elongation compared to the configuration of a conventional hollow catheter shaft, that is, a two-layer configuration of a core layer made of a fluororesin and an outer layer disposed on the outer periphery of the core layer. It is a layer added to improve From the viewpoint of effectively improving the stretch resistance of the hollow shaft 100, the thickness t2 of the outer core layer 120 is preferably, for example, 0.5 ⁇ m or more, more preferably 1.5 ⁇ m or more. It is more preferably 3 ⁇ m or more.
- the thickness t2 of the outer core layer 120 is, for example, preferably 30 ⁇ m or less, more preferably 15 ⁇ m or less, even more preferably 10 ⁇ m or less. From the same point of view, the thickness t2 of the outer core layer 120 is preferably thinner than the thickness t1 of the inner core layer 110 .
- the core layer 130 includes peaks 130A projecting outward in the radial direction of the hollow shaft 100 (in other words, projecting toward the outer layer 140) and peaks 130A projecting outward in the radial direction of the hollow shaft 100. and convex (in other words, convex toward the lumen 102) troughs 130B are arranged repeatedly in the axial direction (Z-axis direction) of the hollow shaft 100 (hereinafter referred to as “specific configuration SC”). have.
- the specific configuration SC of the core layer 130 is a configuration in which the core layer 130 has a wavy shape in a cross section including the central axis AX of the hollow shaft 100 (see FIG. 2).
- the formation pitch of the peaks 130A may be, for example, 0.01 mm to 3.0 mm.
- the height Ha of the peak portion 130A may be, for example, 0.01 mm to 2.0 mm.
- the height Ha of the peak portion 130A is assumed to be the distance from the apex P1 of the peak portion 130A to the imaginary straight line VL connecting the bottom points P2 of the two valley portions 130B sandwiching the peak portion 130A.
- the peak portion 130A is formed by folding each portion of the core layer 130, and can also be expressed as a “mountain fold”.
- the valley portion 130B is formed by folding each portion of the core layer 130. It can also be expressed as a "valley fold”.
- illustration of the specific configuration SC is omitted.
- FIG. 4 is an explanatory diagram schematically showing the appearance of the core layer 130 having the specific configuration SC.
- peaks 130A and valleys 130B forming specific configuration SC are formed over the entire circumference of core layer 130 .
- SC a portion of the core layer 130 including the tip
- SC a portion of core layer 130 including the tip
- SC the remainder of core layer 130
- the portion that constitutes proximal portion PP of hollow shaft 100 shown in FIG. 1 does not have a particular configuration SC.
- the portion of the core layer 130 that constitutes the distal portion DP of the hollow shaft 100 has the specific configuration SC, the flexibility of the distal portion DP of the hollow shaft 100 is improved.
- the specific configuration SC of the core layer 130 is a configuration in which the hollow shaft 100 (core layer 130) also has unevenness in the circumferential direction. Examples of the shape having an intersection CP where the ridgelines of two ridges 130A aligned in the axial direction of the hollow shaft 100 intersect to form one ridgeline of the ridges 130A include Miura folding and Yoshimura pattern.
- the peaks of the peaks 130A are eccentric in the axial direction (Z-axis direction) of the hollow shaft 100.
- L1 the distance from the bottom point of one valley portion 130B to the top of the peak portion 130A (along the axial direction of the hollow shaft 100) L1 is shorter than the distance L2 from the bottom point of the other valley portion 130B to the top of the peak portion 130A.
- the distance L1 and the distance L2 may be the same.
- the distance L1 and the distance L2 may satisfy the relationship 0.5 ⁇ L1/L2 ⁇ 1.0, or may satisfy the relationship 0.6 ⁇ L1/L2 ⁇ 0.9, A relationship of 0.7 ⁇ L1/L2 ⁇ 0.8 may be satisfied.
- the bottom point of the valley portion 130B is eccentric in the axial direction of the hollow shaft 100 . That is, focusing on one valley portion 130B and two peak portions 130A sandwiching the valley portion 130B, the distance L2 from the top of one peak portion 130A to the bottom point of the valley portion 130B is the same as that of the other peak portion 130A. It is longer than the distance L3 from the peak to the bottom of the valley 130B. However, the distance L2 and the distance L3 may be the same. Note that the distance L2 and the distance L3 may satisfy the relationship 0.5 ⁇ L3/L2 ⁇ 1.0, or may satisfy the relationship 0.6 ⁇ L3/L2 ⁇ 0.9, A relationship of 0.7 ⁇ L3/L2 ⁇ 0.8 may be satisfied.
- A-4. Manufacturing method of hollow shaft 100 Next, an example of a method for manufacturing the hollow shaft 100 will be described. First, the inner core layer 110 is formed around the metal core. Next, the inner core layer 110 formed around the core bar is immersed in a liquid containing the material for forming the outer core layer 120, and then pulled out of the liquid. Then, the outer core layer 120 is formed by firing the material for forming the outer core layer 120 attached around the inner core layer 110 . As a result, the core layer 130 composed of the inner core layer 110 and the outer core layer 120 is formed around the metal core.
- a specific configuration SC is formed on the core layer 130 . Specifically, one end of the portion forming the specific configuration SC in the core layer 130 is fixed, the other end is pushed into the one end side, and then pulled back, so that the peak portion 130A and the valley portion 130B are formed in the core layer 130. Forms an axially repeated specific configuration SC.
- the hollow shaft 100 composed of the core layer 130 and the outer layer 140 is formed around the core metal. Finally, pull out the core bar.
- the hollow shaft 100 can be manufactured by the manufacturing method described above.
- FIG. 5 is an explanatory diagram showing performance evaluation results.
- Sample S1 is an example of hollow shaft 100 of the present embodiment described above. That is, the sample S1 is a three-layer tube composed of a core layer 130 composed of an inner core layer 110 and an outer core layer 120, and an outer layer 140. 130B are repeated in the axial direction).
- PTFE was used as the material for forming the inner core layer 110
- polyimide was used as the material for forming the outer core layer 120
- polyamide elastomer pebax35 from ARKEMA
- the thickness of the inner core layer 110 is set to about 10 ⁇ m
- the thickness of the outer core layer 120 is set to about 3 ⁇ m
- the thickness of the outer layer 140 is set to about 40 ⁇ m, and about 80 ⁇ m in the relatively thick portion (the portion facing the valley portion 130B).
- Samples S2 and S3 are comparative examples. That is, sample S2 is a three-layer tube similar to sample S1, but the core layer 130 does not have the specific configuration SC. That is, in sample S2, both the inner core layer 110 and the outer core layer 120 constituting the core layer 130 are configured to have outer peripheral surfaces substantially parallel to the axial direction of the hollow shaft.
- Sample S3 is a two-layer tube in which the core layer 130 is composed only of the inner core layer 110 and is composed of the core layer 130 and the outer layer 140 . That is, the sample S3 does not have the outer core layer 120 made of a resin having a Young's modulus higher than that of the fluororesin. Also, in sample S3, the core layer 130 does not have the specific configuration SC. That is, in sample S3, inner core layer 110 constituting core layer 130 is configured to have an outer peripheral surface substantially parallel to the axial direction of the hollow shaft. The material and thickness of each layer of samples S2 and S3 are the same as those of sample S1.
- the value of the average Young's modulus of sample S1 was lower than the value of sample S2 that did not have the specific configuration SC, it was sufficiently high compared to the value of sample S3 that did not have the outer core layer 120 . Therefore, it was confirmed that sample S1 had sufficiently high elongation resistance. Since the outer core layer 120 is made of a resin with a high Young's modulus, it is considered that the Young's modulus of the sample S1 having the outer core layer 120 is sufficiently high. Note that the value of the average breaking load of sample S1 was equivalent to the value of sample S2 that did not have the specific configuration SC. Therefore, it can be said that the presence or absence of the specific configuration SC hardly affects the breaking load.
- sample S1 had sufficiently high flexibility.
- the specific configuration SC has a configuration in which the peaks 130A and the valleys 130B are repeated in the axial direction, and is a configuration that improves flexibility, so the bending elastic modulus of the sample S1 having the specific configuration SC is sufficiently low. It is considered to be a thing.
- the core layer 130 is composed of the inner core layer 110 made of the fluororesin and the Young's modulus of the fluororesin. and the core layer 130 has a specific configuration SC in which the peaks 130A and the valleys 130B are repeated in the axial direction. It was confirmed that it is possible to achieve both high resistance and stretch resistance at a high level.
- the hollow shaft 100 that constitutes the catheter 10 of the present embodiment is composed of a tubular core layer 130 and a resin. and an outer layer 140 having parallel peripheral surfaces.
- the core layer 130 includes a tubular inner core layer 110 made of a fluororesin and an outer core layer 120 made of a resin having a Young's modulus higher than that of the fluororesin and arranged on the outer periphery of the inner core layer 110 . have.
- peak portions 130A projecting outward in the radial direction of the hollow shaft 100 and valley portions 130B projecting radially inward of the hollow shaft 100 are repeatedly arranged in the axial direction of the hollow shaft 100. has a specific configuration SC.
- the core layer 130 includes the inner core layer 110 made of a fluororesin and the outer core layer 120 made of a resin having a higher Young's modulus than that of the fluororesin. Because it has a high stretch resistance. Further, in the hollow shaft 100 of the present embodiment, the core layer 130 has the specific configuration SC in which the peaks 130A and the valleys 130B are repeatedly arranged. , with high flexibility. Therefore, according to the hollow shaft 100 of the present embodiment, both flexibility and stretch resistance of the hollow shaft 100 can be achieved at high levels.
- the specific configuration SC of the core layer 130 is the intersection point CP where the ridgelines of the two ridges 130A arranged in the axial direction of the hollow shaft 100 intersect to become one ridgeline of the ridges 130A. It is a configuration including Therefore, according to the hollow shaft 100 of the present embodiment, the flexibility of the hollow shaft 100 can be further effectively improved, and both the flexibility and the stretch resistance of the hollow shaft 100 can be achieved at a higher level. can.
- the outer diameter of the hollow shaft 100 of this embodiment is 5 mm or less.
- the flexibility of the hollow shaft 100 can be improved by forming the specific configuration SC in the core layer 130 by the above-described method.
- the core layer 130 has the specific configuration SC in part in the axial direction of the hollow shaft 100 and does not have the specific configuration SC in the remaining part. Therefore, according to the hollow shaft 100 of the present embodiment, it is possible to improve the flexibility of the portion where flexibility is particularly required while ensuring high stretch resistance as a whole, and to provide the hollow shaft 100 with desired performance. can do. More specifically, in hollow shaft 100 of the present embodiment, core layer 130 has specific configuration SC in a portion including the tip of core layer 130 and does not have specific configuration SC in the remaining portion. Therefore, according to the hollow shaft 100 of the present embodiment, it is possible to improve the flexibility of the portion on the distal end side where flexibility is particularly required while ensuring high stretch resistance as a whole.
- the thickness t2 of the outer core layer 120 is thinner than the thickness t1 of the inner core layer 110. Therefore, according to the hollow shaft 100 of the present embodiment, it is possible to suppress a decrease in the flexibility of the hollow shaft 100 due to the core layer 130 including the outer core layer 120, and the flexibility and durability of the hollow shaft 100 can be suppressed. It is possible to achieve both elasticity and stretchability at a higher level.
- the catheter 10 of the present embodiment includes the hollow shaft 100 configured as described above, the flexibility and stretch resistance of the hollow shaft 100 that constitutes the catheter 10 can be achieved at a high level.
- the configuration of the catheter 10 in the above embodiment is merely an example, and various modifications are possible.
- the hollow shaft 100 constituting the catheter 10 is composed of the core layer 130 and the outer layer 140.
- the hollow shaft 100 may further include a second outer layer arranged on the outer circumference of the outer layer 140. good.
- another member for example, a reinforcing member such as a braid in which a plurality of wires are woven together
- the core layer 130 is composed of the inner core layer 110 and the outer core layer 120, but the core layer 130 may further include other layers. Other layers may be arranged on the inner circumference of the inner core layer 110, may be arranged between the inner core layer 110 and the outer core layer 120, or may be arranged on the outer circumference of the outer core layer 120. good too.
- the core layer 130 only the portion including the tip (the portion constituting the distal portion DP of the hollow shaft 100) has the specific configuration SC, but the core layer 130 has the specific configuration SC.
- the parts can be changed as appropriate according to the performance required of the hollow shaft 100 .
- the core layer 130 may have a specific configuration SC over its entire length.
- the specific configuration SC of the core layer 130 includes the crossing portion CP where the ridgelines of the two ridges 130A aligned in the axial direction of the hollow shaft 100 intersect to become one ridgeline of the ridges 130A.
- a specific configuration SC does not necessarily include the intersection CP.
- each constituent member of the hollow shaft 100 and the size relationship between the thicknesses of the members in the above-described embodiment are merely examples, and various modifications are possible.
- the material of each component of the hollow shaft 100 in the above embodiment is merely an example, and other materials can be used.
- the manufacturing method of the hollow shaft 100 in the above embodiment is merely an example, and other manufacturing methods can be adopted.
- the hollow shaft 100 that constitutes the catheter 10 has been described as an example of a medical tube, but the technology disclosed in this specification can be applied to other medical tubes (for example, a hollow shaft that constitutes a balloon catheter). , tubes for indwelling needles, etc.).
- catheter 20 distal tip 30: connector 100: hollow shaft 102: lumen 110: inner core layer 120: outer core layer 130: core layer 130A: crest 130B: valley 140: outer layer CP: intersection DP: distal Part PP: Proximal part SC: Specific configuration
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Abstract
Description
A-1.カテーテル10の構成:
図1は、本実施形態におけるカテーテル10の構成を概略的に示す説明図である。図1には、カテーテル10の側面構成が示されている。なお、図1では、便宜上、カテーテル10の一部の構成の図示が省略されている。図1において、Z軸正方向側が、体内に挿入される先端側(遠位側)であり、Z軸負方向側が、医師等の手技者によって操作される基端側(近位側)である。図1では、カテーテル10が全体としてZ軸方向に平行な直線状となった状態を示しているが、カテーテル10は湾曲させることができる程度の柔軟性を有している。なお、本明細書では、カテーテル10およびその各構成部材について、先端側の端を「先端」といい、先端およびその近傍を「先端部」といい、基端側の端を「基端」といい、基端およびその近傍を「基端部」という。
図2および図3は、中空シャフト100の詳細構成を示す説明図である。図2には、図1のX1部の断面構成(中空シャフト100の中心軸AXを含む断面の構成)が拡大して示されており、図3には、図2のX2部の断面構成(同じく、中空シャフト100の中心軸AXを含む断面の構成)が拡大して示されている。
次に、コア層130の詳細構成について説明する。図3に示すように、コア層130は、中空シャフト100の径方向外側に向かって凸な(換言すれば外層140に向かって凸な)山部130Aと、中空シャフト100の径方向内側に向かって凸な(換言すればルーメン102に向かって凸な)谷部130Bとが、中空シャフト100の軸方向(Z軸方向)に繰り返し配置された構成(以下、「特定構成SC」という。)を有する。コア層130の特定構成SCは、換言すれば、中空シャフト100の中心軸AX(図2参照)を含む断面において、コア層130が波形形状となっている構成である。山部130Aの形成ピッチは、例えば、0.01mm~3.0mmであってよい。また、山部130Aの高さHaは、例えば、0.01mm~2.0mmであってよい。なお、山部130Aの高さHaは、山部130Aの頂点P1から、山部130Aを挟む2つの谷部130Bの底点P2間を結ぶ仮想直線VLまでの距離であるとする。山部130Aは、コア層130の各部分が山折りされたものであり、「山折り部」とも表現することができ、谷部130Bは、コア層130の各部分が谷折りされたものであり、「谷折り部」とも表現することができる。なお、図2では、特定構成SCの図示を省略している。
次に、中空シャフト100の製造方法の一例を説明する。まず、芯金の周りに内側コア層110を形成する。次に、芯金の周りに形成された内側コア層110を、外側コア層120の形成材料を含む液に浸漬した後、該液から引き上げる。そして、内側コア層110の周りに付着した外側コア層120の形成材料を焼成することにより、外側コア層120を形成する。これにより、芯金の廻りに、内側コア層110と外側コア層120とから構成されたコア層130が形成される。
中空シャフトの耐伸性および柔軟性について、性能評価を行った。図5は、性能評価結果を示す説明図である。
以上説明したように、本実施形態のカテーテル10を構成する中空シャフト100は、チューブ状のコア層130と、樹脂により構成され、コア層130の外周に配置され、中空シャフト100の軸方向に略平行な外周面を有する外層140とを備える。コア層130は、フッ素系樹脂により構成されたチューブ状の内側コア層110と、フッ素系樹脂よりヤング率の高い樹脂により構成され、内側コア層110の外周に配置された外側コア層120とを有する。コア層130は、中空シャフト100の径方向外側に向かって凸な山部130Aと、中空シャフト100の径方向内側に向かって凸な谷部130Bとが、中空シャフト100の軸方向に繰り返し配置された特定構成SCを有する。
本明細書で開示される技術は、上述の実施形態に限られるものではなく、その要旨を逸脱しない範囲において種々の形態に変形することができ、例えば次のような変形も可能である。
Claims (7)
- 医療用チューブであって、
チューブ状のコア層と、
樹脂により構成され、前記コア層の外周に配置され、前記医療用チューブの軸方向に略平行な外周面を有する外層と、
を備え、
前記コア層は、
フッ素系樹脂により構成されたチューブ状の内側コア層と、
前記フッ素系樹脂よりヤング率の高い樹脂により構成され、前記内側コア層の外周に配置された外側コア層と、
を有し、
前記コア層は、前記医療用チューブの径方向外側に向かって凸な山部と、前記医療用チューブの径方向内側に向かって凸な谷部とが、前記医療用チューブの軸方向に繰り返し配置された特定構成を有する、
医療用チューブ。 - 請求項1に記載の医療用チューブであって、
前記特定構成は、前記医療用チューブの軸方向に並ぶ2つの前記山部の稜線が交わって1つの前記山部の稜線となる交差部を含む構成である、
医療用チューブ。 - 請求項1または請求項2に記載の医療用チューブであって、
前記医療用チューブの外径は、5mm以下である、
医療用チューブ。 - 請求項1から請求項3までのいずれか一項に記載の医療用チューブであって、
前記コア層は、前記医療用チューブの軸方向における一部分において前記特定構成を有し、残りの部分において前記特定構成を有さない、
医療用チューブ。 - 請求項4に記載の医療用チューブであって、
前記コア層は、前記コア層の先端を含む一部分において前記特定構成を有し、残りの部分において前記特定構成を有さない、
医療用チューブ。 - 請求項1から請求項5までのいずれか一項に記載の医療用チューブであって、
前記外側コア層の厚さは、前記内側コア層の厚さより薄い、
医療用チューブ。 - 請求項1から請求項6までのいずれか一項に記載の医療用チューブを備えたカテーテル。
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EP22787787.5A EP4324506A1 (en) | 2021-04-13 | 2022-01-07 | Medical tube and catheter |
CN202280025103.6A CN117083097A (zh) | 2021-04-13 | 2022-01-07 | 医疗用管及导管 |
US18/369,554 US20240001074A1 (en) | 2021-04-13 | 2023-09-18 | Medical tube and catheter |
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JP2021067432A JP2022162571A (ja) | 2021-04-13 | 2021-04-13 | 医療用チューブおよびカテーテル |
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US18/369,554 Continuation US20240001074A1 (en) | 2021-04-13 | 2023-09-18 | Medical tube and catheter |
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06511162A (ja) * | 1991-05-03 | 1994-12-15 | バーナム,ウォレン,アール. | 移動時の摩擦を減少させるために不規則な内面および/または外面を有するカテーテル |
JP2004097278A (ja) * | 2002-09-05 | 2004-04-02 | Japan Lifeline Co Ltd | 医療用管状体およびその製造方法 |
US20060253101A1 (en) * | 2005-03-16 | 2006-11-09 | Andreas Hartlep | Intracranial catheter |
JP2014236863A (ja) | 2013-06-07 | 2014-12-18 | テルモ株式会社 | カテーテル |
US20200384187A1 (en) * | 2019-06-10 | 2020-12-10 | Medtronic Minimed, Inc. | Flexible cannula and process |
-
2021
- 2021-04-13 JP JP2021067432A patent/JP2022162571A/ja active Pending
-
2022
- 2022-01-07 EP EP22787787.5A patent/EP4324506A1/en active Pending
- 2022-01-07 CN CN202280025103.6A patent/CN117083097A/zh active Pending
- 2022-01-07 WO PCT/JP2022/000381 patent/WO2022219859A1/ja active Application Filing
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2023
- 2023-09-18 US US18/369,554 patent/US20240001074A1/en active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06511162A (ja) * | 1991-05-03 | 1994-12-15 | バーナム,ウォレン,アール. | 移動時の摩擦を減少させるために不規則な内面および/または外面を有するカテーテル |
JP2004097278A (ja) * | 2002-09-05 | 2004-04-02 | Japan Lifeline Co Ltd | 医療用管状体およびその製造方法 |
US20060253101A1 (en) * | 2005-03-16 | 2006-11-09 | Andreas Hartlep | Intracranial catheter |
JP2014236863A (ja) | 2013-06-07 | 2014-12-18 | テルモ株式会社 | カテーテル |
US20200384187A1 (en) * | 2019-06-10 | 2020-12-10 | Medtronic Minimed, Inc. | Flexible cannula and process |
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CN117083097A (zh) | 2023-11-17 |
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