Puncture catheter
The puncture catheter design addresses the issue of needle penetration through the guiding catheter by incorporating a cylindrical member with a braid, coil, or pipe structure in contact with the resin tube, thereby enhancing procedural safety and reliability.
Patent Information
- Application Number
- PCT/JP2024/041410
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2023-12-21
- Filing Date
- 2024-11-22
- Publication Date
- 2025-06-26
AI Technical Summary
Existing chemical solution injection needle systems are prone to the needle piercing or penetrating through the guiding catheter, which can lead to complications during medical procedures.
A puncture catheter design featuring a resin tube with a cylindrical member having a braid, coil, or pipe structure, where the outer surface of the cylindrical member is in contact with the inner surface of the resin tube, reducing the likelihood of the needle piercing or penetrating through the resin tube.
The design effectively prevents the needle from piercing or penetrating through the resin tube, enhancing the safety and reliability of medical procedures involving direct administration of chemical solutions to organs.
Smart Images
Figure JP2024041410_26062025_PF_FP_ABST
Abstract
Description
Puncture catheter
[0001] The present invention relates to a puncture catheter equipped with a medical puncture needle.
[0002] Treatments such as direct administration of a medicinal solution such as a cardiac regenerative cell preparation to cardiac muscle cells that are losing function due to myocardial infarction, etc., are being carried out. When administering a medicinal solution directly to an internal organ, it is necessary to insert a catheter with a needle into a body cavity and puncture the organ with the needle.
[0003] As an example of a medical device for use in the above-described treatment, Patent Document 1 discloses a medical device injection needle system having a hollow needle for puncturing a patient's myocardium and injecting a medical device, and a guiding catheter into which the needle is inserted.
[0004] International Publication No. 2021 / 192283
[0005] However, the drug solution injection needle system described in Patent Document 1 has a problem in that the needle is likely to pierce or penetrate the wall of the guiding catheter.
[0006] The present invention has been made in consideration of the above circumstances, and its purpose is to provide a new puncture catheter that is less likely to have a puncture needle pierce or penetrate through a resin tube.
[0007] Puncture needles according to embodiments of the present invention that can solve the above problems are as follows: [1] A puncture catheter comprising: a resin tube having a longitudinal direction and a lumen extending in the longitudinal direction, a tubular member whose outer surface is in contact with the inner surface of a distal portion of the resin tube, and a medical puncture needle that is movable in the longitudinal direction within the lumen of the resin tube and the lumen of the tubular member, wherein the tubular member is configured as a braid in which wire is woven, a coil in which wire is wound, a pipe in which a plurality of holes or grooves are formed, or a combination of these.
[0008] In the above-mentioned puncture catheter, the outer surface of the cylindrical member is in contact with the inner surface of the resin tube, so that the puncture needle is less likely to pierce or penetrate the resin tube.
[0009] The puncture catheter according to the embodiment of the present invention is preferably any one of the following [2] to [7].
[0010] [2] The puncture catheter according to [1], wherein a gap exists in the lumen of the tubular member, and the inner surface of the tubular member is exposed to the gap. [3] The puncture catheter according to [1] or [2], wherein the puncture catheter includes a handle for adjusting the bending direction of the resin tube, wherein the resin tube has a bending section that bends by operating the handle and a non-bending section that is located proximal to the bending section and does not bend by operating the handle, and wherein the tubular member is disposed in the bending section. [4] The puncture catheter according to [3], wherein the tubular member is not disposed in the non-bending section. [5] The puncture catheter according to any one of [1] to [4], wherein three or more electrodes are disposed on the outer surface of the resin tube, and wherein the tubular member is disposed distal to the proximal end of the proximal-most electrode and not proximal to the proximal end of the proximal-most electrode. [6] The puncture catheter according to any one of [1] to [5], wherein the tubular member is made of metal. [7] The puncture catheter according to any one of [1] to [6], wherein the inner surface of the cylindrical member and the puncture needle are capable of contacting each other.
[0011] In the puncture catheter according to the embodiment of the present invention, the outer surface of the tubular member is in contact with the inner surface of the resin tube, making it difficult for the puncture needle to pierce or penetrate the resin tube.
[0012] FIG. 1 is a side view showing an example of a puncture catheter according to an embodiment of the present invention. FIG. 2 is a cross-sectional view (partially a side view) of the puncture catheter shown in FIG. 1. FIG. 3 is a cross-sectional view (partially a side view) showing the puncture catheter shown in FIG. 2 in a curved state. FIG. 4 is a cross-sectional end view taken along line IV-IV in FIG. 2. FIG. 5 is a cross-sectional view (partially a side view) showing a modified example of the puncture catheter shown in FIG. 2. FIG. 6 is a cross-sectional view (partially a side view) showing a modified example of the puncture catheter shown in FIG. 2. FIG. 7 is a cross-sectional view (partially a side view) showing a modified example of the puncture catheter shown in FIG. 2. FIG. 8 is a cross-sectional view showing a modified example of the tubular member.
[0013] The present invention will be described in detail below with reference to the drawings. However, the present invention is not limited to the illustrated examples, and appropriate modifications can be made within the scope of the above and below-described purpose, and all such modifications are within the technical scope of the present invention. In each drawing, hatching, symbols, etc. may be omitted for convenience. In such cases, reference should be made to the specification or other drawings. Furthermore, the dimensions of various parts in the drawings may differ from their actual dimensions, as priority is given to helping understand the features of the present invention.
[0014] A puncture catheter according to an embodiment of the present invention is a puncture catheter comprising a resin tube having a longitudinal direction and a lumen extending in the longitudinal direction, a tubular member whose outer surface is in contact with the inner surface of the distal portion of the resin tube, and a medical puncture needle that is movable in the longitudinal direction of the resin tube within the lumen of the resin tube and the lumen of the tubular member, and is characterized in that the tubular member is composed of a braid in which wire is woven, a coil in which wire is wound, a pipe in which multiple holes or grooves are formed, or a combination of these.
[0015] The overall configuration of a puncture catheter according to an embodiment of the present invention will be described with reference to Figures 1 to 8. Figures 1 to 7 show a puncture catheter 1 comprising a resin tube 10, a tubular member 20, and a puncture needle 30. Figures 2 to 8 show specific aspects of the tubular member 20. In these figures, the longitudinal direction of the resin tube 10 is indicated by x, the radial direction of the resin tube 10 by y, and the circumferential direction of the resin tube 10 by c. The radial direction y is a direction perpendicular to the longitudinal direction x. The longitudinal direction x of the resin tube 10 can also be said to be the extension direction of the resin tube 10.
[0016] In this specification, the proximal side refers to the direction toward the user's hand relative to the longitudinal direction x of the resin tube 10, and the distal side refers to the opposite side of the proximal side, i.e., the direction toward the treatment target. Furthermore, when each component or part is divided into two equal halves in the longitudinal direction x of the resin tube 10, the distal part of each component or part is referred to as the distal part of each component or part, and the proximal part of each component or part is referred to as the proximal part of each component or part. The distal end of each component or part is the most distal end of each component or part. The proximal end of each component or part is the most proximal end of each component or part. The end includes the peripheral portion of the end. That is, the distal end refers to the distal end and the peripheral portion of the distal end, and the proximal end refers to the proximal end and the peripheral portion of the proximal end.
[0017] Fig. 1 is a side view showing an example of a puncture catheter according to an embodiment of the present invention. Fig. 2 is a cross-sectional view (partially a side view) of the puncture catheter shown in Fig. 1. Fig. 3 is a cross-sectional view (partially a side view) showing the puncture catheter shown in Fig. 2 in a curved state. Fig. 4 is an end view of a cut portion taken along line IV-IV shown in Fig. 2. Figs. 5 to 7 are cross-sectional views (partially side views) showing modified examples of the puncture catheter shown in Fig. 2. Fig. 8 is a cross-sectional view showing modified examples of the tubular member.
[0018] As shown in FIGS. 1 to 7, the puncture catheter 1 comprises a resin tube 10, a cylindrical member 20, and a puncture needle 30.
[0019] 1 and 2, the resin tube 10 has a longitudinal direction x and an inner lumen 10e extending in the longitudinal direction x. The resin tube 10 has a distal end 10a, a proximal end 10b, an inner surface 10c facing the inner lumen 10e, and an outer surface 10d facing the outside of the resin tube 10. The distal end 10a and the proximal end 10b of the resin tube 10 are preferably open.
[0020] 2 to 8, the tubular member 20 is a cylindrical member and has a distal end 20a, a proximal end 20b, a lumen 20e, an inner surface 20c facing the lumen 20e, and an outer surface 20d facing the outside of the tubular member 20. The lumen 20e of the tubular member 20 extends in the longitudinal direction x of the resin tube 10, and the distal end 20a and the proximal end 20b are preferably open.
[0021] 2 to 7 , the outer surface 20d of the tubular member 20 is in contact with the inner surface 10c of the distal portion of the resin tube 10. Only a portion of the outer surface 20d of the tubular member 20 may be in contact with the inner surface 10c of the distal portion of the resin tube 10, or the entire outer surface 20d of the tubular member 20 may be in contact with the inner surface 10c of the distal portion of the resin tube 10.
[0022] The tubular member 20 is composed of a braid 22 in which wire 21 is woven as shown in FIG. 5, a coil 23 in which wire 21 is wound as shown in FIG. 2, a pipe 26 in which a plurality of holes 24 or grooves 25 are formed as shown in FIGS. 6 to 8, or a combination of these.
[0023] The puncture needle 30 is for medical use and is inserted into target tissue. The puncture needle 30 is movable in the longitudinal direction x of the resin tube 10 within the inner cavity 10e of the resin tube 10 and the inner cavity 20e of the cylindrical member 20.
[0024] In the above-mentioned puncture catheter 1, the outer surface 20d of the tubular member 20 is in contact with the inner surface 10c of the resin tube 10, so that the puncture needle 30 is less likely to pierce or penetrate the resin tube 10.
[0025] The puncture catheter 1 is used when administering a liquid such as a cell preparation or a medicinal solution to a target tissue. Specifically, the puncture catheter 1 can be used when directly administering a liquid to an internal organ, such as the heart, kidney, or liver. For example, the puncture catheter 1 can be used when directly administering an iPS cell suspension to the liver or kidney, or when directly administering a cardiac regenerative cell preparation to the heart, or more specifically, the myocardium. Note that internal organs refer to organs located within the body, particularly in the abdominal or thoracic region, and are also known as internal organs.
[0026] The resin tube 10 may have a cylindrical shape, a hollow cylindrical shape, a hollow polygonal prism shape, or a shape that is a combination of these.
[0027] The resin tube 10 can be manufactured by extrusion molding. The resin tube 10 may be composed of a single layer or multiple layers. A portion of the resin tube 10 in the longitudinal direction x or circumferential direction c may be composed of a single layer, and the other portion may be composed of multiple layers.
[0028] The resin tube 10 can be made of synthetic resins such as polyolefin resins (e.g., polyethylene and polypropylene), polyamide resins (e.g., nylon), polyester resins (e.g., PET), aromatic polyether ketone resins (e.g., PEEK), polyether polyamide resins, polyurethane resins, polyimide resins, fluororesins (e.g., PTFE, PFA, ETFE), etc. These may be used alone or in combination of two or more.
[0029] The length of the resin tube 10 can be 900 mm or more, 1000 mm or more, 1100 mm or more, etc. The length of the resin tube 10 can be 1200 mm or less, 1400 mm or less, 1600 mm or less, etc. The length of the resin tube 10 refers to the longest length of the resin tube 10 in the longitudinal direction x of the resin tube 10. When used as a puncture catheter to puncture the myocardium, the length of the resin tube 10 is preferably 1400 mm.
[0030] The outer diameter of the resin tube 10 can be 0.5 mm or more, 1.0 mm or more, 1.5 mm or more, etc. The outer diameter of the resin tube 10 can be 2.0 mm or less, 2.5 mm or less, 3.0 mm or less, etc. If the outer shape of the resin tube 10 when observed in the longitudinal direction x of the resin tube 10 is not a perfect circle, the diameter of a circle circumscribing the resin tube 10 is defined as the outer diameter of the resin tube 10. When used as a puncture catheter to puncture the myocardium, the outer diameter of the resin tube 10 is preferably 1 mm.
[0031] The outer surface 20d of the tubular member 20 is in contact with the inner surface 10c of the distal end of the resin tube 10, but it is preferable that the outer surface 20d of the tubular member 20 is in contact with the inner surface 10c of the distal end of the resin tube 10.
[0032] Although only a portion of the outer surface 20d of the tubular member 20 may be in contact with the inner surface 10c of the distal portion of the resin tube 10, it is preferable that the entire outer surface 20d of the tubular member 20 be in contact with the inner surface 10c of the distal portion of the resin tube 10.
[0033] The tubular member 20 may be made of resin. In this case, the resin making up the tubular member 20 may have higher or lower bending rigidity than the resin making up the resin tube 10, but it is preferable that the resin making up the tubular member 20 has lower bending rigidity than the resin making up the resin tube 10. This makes it easier for the puncture catheter 1 to bend at the portion where the tubular member 20 is disposed. The tubular member 20 may also be made of metal. The tubular member 20 may be made entirely of metal, or entirely of resin. The tubular member 20 may be partially made of metal and partially made of resin.
[0034] Examples of metals that can be used to form the cylindrical member 20 include stainless steels such as SUS304 and SUS316, platinum, nickel, cobalt, chromium, titanium, tungsten, gold, Ni-Ti alloys, Co-Cr alloys, and combinations thereof.
[0035] Examples of resins that can be used to form the cylindrical member 20 include polyparaphenylene terephthalamide, polyether ether ketone (PEEK), and polycarbonate (PC).
[0036] The outer surface 20d of the tubular member 20 and the inner surface 10c of the distal portion of the resin tube 10 may be fixed to each other. The outer surface 20d of the tubular member 20 and the inner surface 10c of the distal portion of the resin tube 10 may be welded by melting a portion of them, or may be bonded with an adhesive.
[0037] 2 to 8, a gap exists in the lumen 20e of the tubular member 20, and the inner surface 20c of the tubular member 20 is preferably exposed to the gap. Although only a portion of the inner surface 20c of the tubular member 20 may be exposed to the gap, it is preferable that the entire inner surface 20c of the tubular member 20 is exposed to the gap. With the above configuration, the inner surface 10c of the resin tube 10 is more easily protected by the tubular member 20.
[0038] It is preferable that the inner surface 20c of the tubular member 20 can come into contact with the puncture needle 30. With the above-described configuration, the inner surface 10c of the resin tube 10 can be easily protected by the tubular member 20. Note that only a portion of the inner surface 20c of the tubular member 20 may be able to come into contact with the puncture needle 30, or the entire inner surface 20c of the tubular member 20 may be able to come into contact with the puncture needle 30.
[0039] It is preferable that no other members are disposed between the inner surface 20c of the tubular member 20 and the puncture needle 30. For example, it is preferable that no other resin layer is provided on the inner surface 20c of the tubular member 20.
[0040] The maximum outer diameter of the cylindrical member 20 may be larger than the minimum inner diameter of the resin tube 10. The maximum outer diameter of the cylindrical member 20 and the minimum inner diameter of the resin tube 10 may be the same.
[0041] The minimum inner diameter of the tubular member 20 may be smaller than the minimum inner diameter of the resin tube 10. The minimum inner diameter of the tubular member 20 and the minimum inner diameter of the resin tube 10 may be the same. By making the minimum inner diameter of the tubular member 20 and the minimum inner diameter of the resin tube 10 the same, it is possible to easily eliminate a step between the resin tube 10 and the tubular member 20. This makes it possible to easily protect the inner surface 10c of the resin tube 10 by the tubular member 20 while preventing the puncture needle 30 from getting caught on the step.
[0042] The braid 22 is preferably configured so that the maximum length of the gap between adjacent wires 21 in the longitudinal direction x of the resin tube 10 when no external force is applied to the puncture catheter 1 is no more than twice the wire diameter of the wires 21, more preferably no more than 1.8 times, and even more preferably no more than 1.5 times. It is particularly preferable that the braid 22 is configured so that the maximum length of the gap between adjacent wires 21 in the longitudinal direction x of the resin tube 10 when no external force is applied to the puncture catheter 1 is no more than the wire diameter of the wires 21. This configuration makes it easier for the tubular member 20 to protect the inner surface 10c of the resin tube 10.
[0043] The braid 22 is preferably configured so that the maximum length of the gap between adjacent wires 21 in the radial direction y of the resin tube 10 when no external force is applied to the puncture catheter 1 is no more than twice the wire diameter of the wires 21, more preferably no more than 1.8 times, and even more preferably no more than 1.5 times. It is particularly preferable that the braid 22 is configured so that the maximum length of the gap between adjacent wires 21 in the radial direction y of the resin tube 10 when no external force is applied to the puncture catheter 1 is no more than the wire diameter of the wires 21. This configuration makes it easier for the tubular member 20 to protect the inner surface 10c of the resin tube 10.
[0044] When no external force is applied to the puncture catheter 1, the pitch of the coil 23 may increase toward the distal side or toward the proximal side.
[0045] When no external force is applied to the puncture catheter 1, the pitch of the coil 23 is preferably 2.0 times or less, more preferably 1.8 times or less, and even more preferably 1.5 times or less, the wire diameter of the wire material 21. When no external force is applied to the puncture catheter 1, the pitch of the coil 23 can be 1.0 times or more the wire diameter of the wire material 21. When no external force is applied to the puncture catheter 1, it is particularly preferable that the pitch of the coil 23 is the same as the wire diameter of the wire material 21. With the above configuration, the inner surface 10c of the resin tube 10 can be more easily protected by the tubular member 20.
[0046] The hole 24 formed in the pipe 26 may be a blind hole or a through hole.
[0047] The outer shape of the hole 24 in the pipe 26 when observed from the radial direction of the pipe 26 can be a polygonal shape such as a triangle, a square, or a pentagon, or a circle, an ellipse, or a combination of these. Note that polygons include polygons with clear corner vertices and straight sides, as well as rounded polygons with rounded corners and polygons with at least some of the sides curved.
[0048] The depth direction of the hole 24 may be inclined with respect to the radial direction y of the resin tube 10. For example, as shown in Fig. 8, one hole 24 may have a first opening 241 located on the inner surface 20c side of the tubular member 20 and a second opening 242 located on the outer surface 20d side of the tubular member 20, and the distal end 241a of the first opening 241 may be located distal to the distal end 242a of the second opening 242, and the proximal end 241b of the first opening 241 may be located distal to the proximal end 242b of the second opening 242. This makes it easier to prevent the puncture needle 30 from getting caught in the hole 24.
[0049] The groove 25 formed in the pipe 26 may be a bottomed groove or a through groove.
[0050] The grooves 25 may extend in a direction perpendicular to the longitudinal direction of the pipe 26. The grooves 25 may extend in the longitudinal direction of the pipe 26. The grooves 25 may extend at an angle relative to the longitudinal direction of the pipe 26 and the direction perpendicular to the longitudinal direction of the pipe 26.
[0051] The pipe 26 may have holes 24 and grooves 25 formed therein.
[0052] In the longitudinal direction x of the resin tube 10 , the length of the cylindrical member 20 is preferably shorter than the length of the resin tube 10 .
[0053] The length of the tubular member 20 in the longitudinal direction x of the resin tube 10 can be 20 mm or more, 70 mm or more, 120 mm or more, etc. The length of the tubular member 20 in the longitudinal direction x of the resin tube 10 can be 200 mm or less, 250 mm or less, 300 mm or less, etc. The length of the tubular member 20 in the longitudinal direction x of the resin tube 10 refers to the longest length of the resin tube 10 in the longitudinal direction x. When used as a puncture catheter to puncture the myocardium, the length of the tubular member 20 in the longitudinal direction x of the resin tube 10 is preferably 70 mm.
[0054] The outer diameter of the tubular member 20 can be 0.5 mm or more, 1.0 mm or more, 1.5 mm or more, etc. The outer diameter of the tubular member 20 can be 2.0 mm or less, 2.5 mm or less, 3.0 mm or less, etc. If the outer shape of the tubular member 20 when observed from a direction perpendicular to the radial direction of the tubular member 20 is not a perfect circle, the diameter of a circle circumscribing the tubular member 20 is taken as the outer diameter of the tubular member 20. When used as a puncture catheter to puncture the myocardium, the outer diameter of the tubular member 20 is preferably 1.3 mm.
[0055] The wire rod 21 may have a constant diameter, or the wire rod 21 may have different diameters at different portions.
[0056] The wire diameter of the wire 21 can be 0.1 mm or more, 0.2 mm or more, 0.3 mm or more, etc. The wire diameter of the wire 21 can be 0.5 mm or less, 0.6 mm or less, 0.7 mm or less, etc. If the outer shape of the wire 21 when observed in the axial direction of the wire 21 is not a perfect circle, the diameter of a circle circumscribing the wire 21 is taken as the wire diameter of the wire 21. When used as a puncture catheter 1 to be inserted into myocardium, it is preferable that the outer shape of the wire 21 when observed in the axial direction of the wire 21 is a rectangle, the short side of the rectangle is 0.2 mm, the long side is 0.3 mm, and the wire diameter of the wire 21 is √0.13.
[0057] The puncture catheter 1 may be provided with only one tubular member 20 or may be provided with a plurality of tubular members 20.
[0058] The puncture needle 30 is preferably one that is inserted into an internal organ.
[0059] The puncture needle 30 can be made of, for example, metal or resin. The puncture needle 30 may be made entirely of metal, or entirely of resin. The puncture needle 30 may be partially made of metal and the other portion made of resin.
[0060] The puncture needle 30 is preferably made of only metal, such as stainless steel (SUS304, SUS316, etc.), platinum, nickel, cobalt, chromium, titanium, tungsten, gold, Ni—Ti alloy, Co—Cr alloy, or a combination thereof.
[0061] Examples of resins that can be used to form the puncture needle 30 include polyetheretherketone (PEEK) and polycarbonate (PC). By forming the puncture needle 30 using only resin, without using any metal, the puncture catheter 1 can be used by patients who are allergic to metals.
[0062] The length of the puncture needle 30 in the longitudinal direction x of the resin tube 10 can be 2 mm or more, 3 mm or more, 4 mm or more, etc. The length of the puncture needle 30 in the longitudinal direction x of the resin tube 10 can be 50 mm or less, 30 mm or less, 10 mm or less, etc. The length of the puncture needle 30 in the longitudinal direction x of the resin tube 10 refers to the longest length of the puncture needle 30 in the longitudinal direction x of the resin tube 10. When used as a puncture catheter to puncture the myocardium, the length of the puncture needle 30 in the longitudinal direction x of the resin tube 10 is preferably 5 mm.
[0063] The length of the puncture needle 30 in the radial direction y of the resin tube 10 can be 0.2 mm or more, 0.3 mm or more, 0.4 mm or more, etc. The length of the puncture needle 30 in the radial direction y of the resin tube 10 can be 10 mm or less, 5 mm or less, 1 mm or less, etc. The length of the puncture needle 30 in the radial direction y of the resin tube 10 refers to the longest length of the puncture needle 30 in the radial direction y of the resin tube 10. When used as a puncture catheter to puncture the myocardium, the length of the puncture needle 30 in the radial direction y of the resin tube 10 is preferably 0.45 mm.
[0064] The puncture needle 30 preferably has an inner cavity extending in the longitudinal direction x of the resin tube 10 and a hole 31 that connects the inner cavity to the outside of the puncture needle 30. A liquid such as a cell preparation or a drug solution that has been carried through the inner cavity of the puncture needle 30 is carried to the target tissue through this hole 31.
[0065] It is preferable that the hole 31 be capable of discharging liquid from the lumen of the puncture needle 30 radially outwardly of the resin tube 10. For this reason, it is preferable that the hole 31 be located proximal to the distal end of the puncture needle 30 and distal to the proximal end of the puncture needle 30.
[0066] The puncture needle 30 may have only one or more holes 31. When the puncture needle 30 has only one hole 31, it becomes easier to administer a liquid such as a cell preparation or a drug solution in a pinpoint manner. When the puncture needle 30 has multiple holes 31, it becomes easier to administer a liquid such as a cell preparation or a drug solution over a wide area.
[0067] The outer shape of the hole 31 of the puncture needle 30 when observed from a direction perpendicular to the longitudinal direction x of the resin tube 10 can be a polygonal shape such as a triangle, a square, or a pentagon, or a circle, an ellipse, or a combination of these.
[0068] The puncture catheter 1 may include a handle 40 for adjusting the bending direction of the resin tube 10. The handle 40 is a part that is held by the user, and is preferably shaped to be easily held by the user. The handle 40 is preferably connected to the proximal end of the resin tube 10.
[0069] The bending direction of the resin tube 10 can be adjusted by operating the handle 40, for example, by providing a wire on the puncture catheter 1. More specifically, the distal end of the wire is fixed to the distal end of the resin tube 10, the proximal end of the wire is fixed to the handle 40, and the resin tube 10 can be bent by operating the handle 40 to move the wire toward the proximal side.
[0070] The material of which the handle 40 is made is not particularly limited, but examples thereof include polyolefin resins such as polypropylene (PP) and polyethylene (PE), polyester resins such as polyethylene terephthalate (PET), polycarbonate resins, ABS resins, and polyurethane resins.
[0071] 3, the resin tube 10 may have a curved section 11 that is curved by operating the handle 40, and a non-curved section 12 that is located proximal to the curved section 11 and is not curved by operating the handle 40. In this case, the tubular member 20 is preferably disposed in the curved section 11. With the above configuration, the puncture needle 30 is less likely to pierce or penetrate the resin tube 10 in the curved portion of the resin tube 10.
[0072] The tubular member 20 may be disposed in the non-curved section 12 , but the tubular member 20 does not have to be disposed in the non-curved section 12 .
[0073] 1 to 7, electrodes 50 may be arranged on the outer surface 10d of the resin tube 10. The number of electrodes 50 arranged on the outer surface 10d of the resin tube 10 may be one or two, but preferably three or more. The number of electrodes 50 arranged on the outer surface 10d of the resin tube 10 may be, for example, 10 or less, or 8 or less.
[0074] It is preferable to use electrodes 50 that can detect electrical signals from organs or detect current flow. Electrical signals include information on current, voltage, potential, etc. For example, it is preferable to use electrodes that can detect the strength and direction of current flow.
[0075] The electrode 50 is preferably annular or cylindrical.
[0076] The electrodes 50 can be made of a conductive material such as platinum or stainless steel, but preferably contain an X-ray opaque material such as platinum to make it easier to determine the position of the electrodes under X-ray fluoroscopy. The materials constituting the electrodes 50 may all be the same or may be different.
[0077] The electrode 50 is preferably disposed on the outer surface 10d of the distal portion of the resin tube 10, and more preferably disposed on the outer surface 10d of the distal end portion of the resin tube 10.
[0078] The tubular member 20 may be disposed distal to the proximal end of the electrode 50 located most proximal. The entire tubular member 20 may be disposed distal to the proximal end of the electrode 50 located most proximal. The tubular member 20 does not have to be disposed proximal to the proximal end of the electrode 50 located most proximal. Alternatively, only a portion of the tubular member 20 may be disposed distal to the proximal end of the electrode 50 located most proximal, with the remaining portion of the tubular member 20 being disposed proximal to the proximal end of the electrode 50 located most proximal.
[0079] The tubular member 20 may be disposed proximal to the distal end of the electrode 50 located most distally. The entire tubular member 20 may be disposed proximal to the distal end of the electrode 50 located most distally. The tubular member 20 does not have to be disposed distal to the distal end of the electrode 50 located most distally. Alternatively, only a portion of the tubular member 20 may be disposed proximal to the distal end of the electrode 50 located most distally, with the remaining portion of the tubular member 20 being disposed distal to the distal end of the electrode 50 located most distally.
[0080] 2, the puncture catheter 1 may have a tube 60 connected to the proximal end of the puncture needle 30 and having a lumen extending in the longitudinal direction x of the resin tube 10. It is preferable that the proximal end of the puncture needle 30 and the distal end of the tube 60 are connected so that the lumen of the puncture needle 30 and the lumen of the tube 60 communicate with each other.
[0081] It is preferable that the tube 60 be movable in the longitudinal direction x of the resin tube 10 in the inner cavity 10 e of the resin tube 10 and the inner cavity 20 e of the tubular member 20 .
[0082] The tube 60 can be made of, for example, any of the materials exemplified as materials that can be used to make the puncture needle 30 .
[0083] The tube 60 may be made up of only one cylindrical member, or may be made up of a plurality of cylindrical members.
[0084] This application claims the benefit of priority based on Japanese Patent Application No. 2023-215765, filed on December 21, 2023. The entire contents of the specification of Japanese Patent Application No. 2023-215765, filed on December 21, 2023, are incorporated herein by reference.
[0085] 1: Puncture catheter 10: Resin tube 10a: Distal end 10b: Proximal end 10c: Inner surface 10d: Outer surface 10e: Lumen 11: Curved section 12: Non-curved section 20: Cylindrical member 20a: Distal end 20b: Proximal end 20c: Inner surface 20d: Outer surface 20e: Lumen 21: Wire 22: Braid 23: Coil 24: Hole 241: First opening 241a: Distal end 241b: Proximal end 242: Second opening 242a: Distal end 242b: Proximal end 25: Groove 26: Pipe 30: Puncture needle 31: Hole 40: Handle 50: Electrode 60: Tube
Claims
1. A puncture catheter comprising: a resin tube having a longitudinal direction and an inner lumen extending in the longitudinal direction; a tubular member whose outer surface is in contact with the inner surface of a distal portion of the resin tube; and a medical puncture needle that is movable in the longitudinal direction within the inner lumen of the resin tube and the inner lumen of the tubular member, wherein the tubular member is configured as a braid in which wire is woven, a coil in which wire is wound, a pipe in which a plurality of holes or grooves are formed, or a combination of these.
2. The puncture catheter according to claim 1, wherein a gap exists in the inner cavity of the tubular member, and the inner surface of the tubular member is exposed to the gap.
3. The puncture catheter according to claim 1 or 2, wherein the puncture catheter is provided with a handle for adjusting the bending direction of the resin tube, the resin tube has a curved section which is bent by operating the handle, and a non-curved section which is located proximal to the curved section and is not bent by operating the handle, and the tubular member is disposed in the curved section.
4. The puncture catheter according to claim 3, wherein the tubular member is not disposed in the non-curved section.
5. A puncture catheter as described in claim 1 or 2, wherein three or more electrodes are arranged on the outer surface of the resin tube, and the tubular member is arranged distal to the proximal end of the electrode located most proximal, but is not arranged proximal to the proximal end of the electrode located most proximal.
6. The puncture catheter according to claim 1 or 2, wherein the tubular member is made of metal.
7. The puncture catheter according to claim 1 or 2, wherein the inner surface of the tubular member and the puncture needle are capable of abutting against each other.
Citation Information
Patent Citations
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