Medical Devices
The medical device addresses operability issues by employing convex portions with varying frictional resistances on its surface, enhancing smooth insertion and anchoring within body cavities.
Patent Information
- Application Number
- JP2021044634
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- Filing Date
- 2021-03-18
- Publication Date
- 2025-03-18
- Estimated Expiration
- 2041-03-18
AI Technical Summary
The existing medical devices, such as catheters, face challenges in operability due to inadequate frictional resistance management on their surface, which affects smooth insertion and anchoring within body cavities.
A medical device with a long body having lumens, featuring convex portions on its outer surface with distinct first and second surfaces facing the tip and proximal end sides, respectively. The frictional resistance of the first surface is intentionally smaller than that of the second surface, optimizing insertion and anchoring properties.
The medical device achieves enhanced operability by reducing sliding resistance during insertion and ensuring effective anchoring to prevent unintentional retraction, thereby improving overall performance and usability.
Smart Images
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Abstract
Description
[Technical field]
[0001] The present invention relates to medical devices. [Background technology]
[0002] There are types of medical devices that are inserted into a body cavity and used to inject a liquid such as a medicinal solution into the body cavity. For example, such a medical device is described in Patent Document 1. The medical device in Patent Document 1 (referred to as a catheter in the document) includes a medical device main body (referred to as a catheter main body in the document) that is a long tubular member, and a lumen formed by the inner cavity of the medical device main body, and is capable of supplying a liquid such as a medicinal solution into the body cavity via the lumen. [Prior art documents] [Patent documents]
[0003] [Patent Document 1] JP 2020-162645 A Summary of the Invention [Problem to be solved by the invention]
[0004] According to the investigations of the present inventors, the structure of the medical device of Patent Document 1 leaves room for improvement in terms of the operability of the medical device.
[0005] The present invention has been made in consideration of the above problems, and provides a medical device that can achieve even better operability. [Means for solving the problem]
[0006] According to the present invention, a medical device includes an elongated medical device body having a lumen, The outer peripheral surface of the medical device body has convex portions including a first surface facing the distal end side and a second surface facing the proximal end side, the convex portions being located at different positions in an axial direction of the medical device body, A medical device is provided, wherein the frictional resistance of the first surface is less than the frictional resistance of the second surface. Effect of the Invention
[0007] According to the present invention, it is possible to realize even better operability of a medical device. [Brief description of the drawings]
[0008] [Figure 1] 1 is a schematic diagram showing an overall configuration of a medical device according to a first embodiment. [Diagram 2] 2(a) and 2(b) are views showing the distal end of a medical device body in the first embodiment, with FIG. 2(a) being a longitudinal sectional view and FIG. 2(b) being a side view. [Diagram 3] 3(a) and 3(b) are views showing the distal end portion of a medical device body in the second embodiment, with FIG. 3(a) being a longitudinal sectional view and FIG. 3(b) being a side view. [Figure 4] 4(a) and 4(b) are views showing the distal end portion of a medical device body in the third embodiment, with FIG. 4(a) being a longitudinal sectional view and FIG. 4(b) being a side view. [Diagram 5] 5(a) and 5(b) are views showing the distal end portion of a medical device body in the fourth embodiment, with FIG. 5(a) being a longitudinal sectional view and FIG. 5(b) being a side view. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0009] Hereinafter, each embodiment of the present invention will be described with reference to Fig. 1 to Fig. 5(b). In all drawings, the same components are denoted by the same reference numerals, and the description will be omitted as appropriate. Fig. 2(a), Fig. 3(a), Fig. 4(a), and Fig. 5(a) are cross-sectional views taken along the axial direction of the medical device body 10.
[0010] The embodiments described below are merely examples for facilitating understanding of the present invention, and are not intended to limit the present invention. In other words, the shapes, dimensions, arrangements, and other aspects of the components described below may be modified or improved without departing from the spirit of the present invention, and the present invention includes equivalents thereof. The various components of the medical device 100 of the present invention do not need to exist independently of one another. It is acceptable for multiple components to be formed as a single member, for one component to be formed from multiple members, for one component to be a part of another component, or for part of one component to overlap with part of another component. In the following description, the distal side of the medical device 100 is also referred to as the tip side, and the proximal side is also referred to as the base side. The tip portion refers to a certain range including the distal end (the most distal end) and its periphery, and the base portion refers to a certain range including the proximal end (the most proximal end) and its periphery. In addition, below, the axial direction of the medical device body 10 may be simply referred to as the axial direction, the radial direction of the medical device body 10 may be simply referred to as the radial direction, and the circumferential direction of the medical device body 10 may be simply referred to as the circumferential direction.
[0011] [First embodiment] First, the first embodiment will be described with reference to FIG. 1 to FIG. 2(b). As shown in any one of Figures 1 to 2(b), the medical device 100 of this embodiment comprises a long medical device body 10 having a lumen 20, and the outer surface of the medical device body 10 has convex-shaped portions 30 including a first surface 32 facing the tip side and a second surface 34 facing the base end side, at different positions in the axial direction of the medical device body 10, and the frictional resistance of the first surface 32 is smaller than the frictional resistance of the second surface 34.
[0012] The medical device 100 is, for example, a catheter, and is used to supply a liquid such as a contrast agent or a medicinal solution into a body cavity via the lumen 20. However, the medical device 100 may be, for example, a medical device other than a catheter inserted into a body cavity. In the present embodiment, the body cavity into which the medical device 100 is inserted is, for example, a blood vessel, but the body cavity may also be, for example, a digestive tract such as the trachea or the intestines.
[0013] According to this embodiment, the frictional resistance of the first surface 32 is smaller than that of the second surface 34, the first surface 32 faces the distal end side, and the second surface 34 faces the proximal end side. As a result, when the medical device 100 is inserted into a body cavity, the first surface 32, which has the smaller frictional resistance, mainly contacts the inner wall surface of the body cavity, out of the first surface 32 and the second surface 34, and therefore the sliding resistance when the medical device 100 slides toward the distal end side inside the body cavity can be reduced. Therefore, the medical device 100 can be smoothly inserted into the body cavity. Furthermore, according to this embodiment, the frictional resistance of the second surface 34 facing the base end side is greater than the frictional resistance of the first surface 32 facing the tip end side. As a result, when the medical device 100 is inserted into a body cavity and the medical device main body 10 attempts to move toward the base end side, of the first surface 32 and the second surface 34, the second surface 34 having the greater frictional resistance can be anchored to the inner wall surface of the body cavity, so that when liquid is injected into the body cavity, the medical device main body 10 can be prevented from unintentionally retreating toward the base end side due to the recoil caused when the liquid is discharged. In this way, according to this embodiment, good operability of the medical device 100 can be achieved.
[0014] In this embodiment, as shown in Fig. 1, the outer peripheral surface of the medical device body 10 includes a region where the convex-shaped portion 30 is formed and a region 61 where the convex-shaped portion 30 is not formed, and the convex-shaped portion 30 is a portion that protrudes radially outward from the region 61. The outer diameter of the region 61 is substantially constant regardless of the position in the axial direction. However, the outer diameter of the region 61 may be gradually or stepwise reduced from the base end to the tip end of the medical device body 10.
[0015] The medical device body 10 is a long hollow tubular member. As shown in Figures 1 and 2(a), the medical device body 10 has a two-layer structure, for example, including an inner layer 13 and an outer layer 14 arranged around the inner layer 13, and is configured by laminating the inner layer 13 and the outer layer 14 in this order from the axial side of the medical device body 10. The inner layer 13 is the innermost layer of the medical device body 10, and is formed, for example, in a cylindrical shape with a constant wall thickness regardless of the position in the axial direction. The inner layer 13 is open at both the distal and proximal ends of the medical device body 10. In this embodiment, the lumen 20 is defined by the inner peripheral surface of the inner layer 13. The inner layer 13 is made of, for example, a fluorine-based thermoplastic polymer resin. The fluorine-based thermoplastic polymer material is not particularly limited, but may be polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), perfluoroalkoxy fluorine resin (PFA), or the like. The outer layer 14 is the outermost layer of the medical device body 10. For example, the majority (major part) of the thickness of the medical device body 10 is accounted for by the thickness of the outer layer 14. The outer layer 14 is formed, for example, in a cylindrical shape having a substantially constant thickness regardless of the position in the axial direction. However, the outer diameter of the tip of the tip portion of the outer layer 14 is, for example, slightly reduced toward the tip side.
[0016] The outer diameter of the medical device body (outer diameter of the non-formation region 61) is not particularly limited, but is preferably 0.3 mm or more and 1.2 mm or less, and more preferably 0.4 mm or more and 1.0 mm or less. The inner diameter of the medical device body is not particularly limited, but is preferably 0.2 mm or more and 1.0 mm or less. The total length of the medical device body is not particularly limited, but is preferably 500 mm or more and 2000 mm or less.
[0017] The medical device body 10 also includes a reinforcing layer 16 (see FIG. 2(a)) formed in a mesh shape from braided metal wires, for example. The reinforcing layer 16 is, for example, embedded in the outer layer 14 and disposed around the inner layer 13. The reinforcing layer 16 is, for example, disposed coaxially with the inner layer 13. The reinforcing layer 16 is disposed, for example, from the distal end to the proximal end of the medical device body 10. The medical device body 10 is entirely reinforced by the reinforcing layer 16. The reinforcing layer 16 may be, for example, made of a metal wire wound in a coil shape. The reinforcing layer 16 may be, for example, disposed in a portion of the medical device body 10 in the axial direction.
[0018] Furthermore, in this embodiment, the medical device 100 includes a marker member 11 (see FIG. 2(a)) embedded in the distal end portion 10a of the medical device body 10. More specifically, as shown in FIG. 2(a), the marker member 11 is embedded in the tip portion of the outer layer 14, for example. The marker member 11 is a cylindrical member made of an X-ray impermeable material such as platinum, tungsten, etc. The marker member 11 is embedded in the outer layer 14 in a coaxial arrangement with the medical device body 10. By using the position of the marker member 11 as an index, the position of the tip portion 10a of the medical device main body 10 within the body cavity can be accurately recognized under X-ray (radiation) observation.
[0019] As shown in FIG. 1, the base end 10b of the medical device body 10 is provided with a gripping portion 50 that is gripped by a user. The gripping portion 50 has a connecting portion 51 for inserting a drug solution injection device such as a syringe or injector (not shown) from its base end. A screw groove is formed on the outer periphery of the connecting portion 51 so that a syringe can be detachably fixed. A hub 52 is provided at the center of the gripping portion 50 in the axial direction. A through hole is formed in the gripping portion 50, penetrating the gripping portion 50 in the axial direction from the tip to the base end, and the base end 10b of the medical device body 10 is inserted into the tip side of this through hole, and the base end 10b of the medical device body 10 is fixed to the gripping portion 50. The hub 52 has two wing portions 53 that face each other across the axis of the gripping portion 50. By rotating the wing parts 53 around the axis of the grip part 50, it is possible to perform a torque operation to rotate the entire medical device body 10 about its axis, and it is possible to adjust the direction of the tip of the medical device body 10 that has entered the body cavity. A protector 54 is provided on the tip side of the hub 52 and covers the periphery of the base end of the medical device 100.
[0020] Here, as shown in Figs. 2(a) and 2(b), in this embodiment, two or more convex portions 30 are arranged on the distal end portion 10a of the medical device body. This allows the proportion of the first surface 32 in the outer surface of the medical device body 10 to be increased, thereby ensuring a sufficient contact area between the first surface 32 and the inner wall surface of the body cavity. This allows the sliding resistance when the medical device 100 slides toward the distal end inside the body cavity to be further reduced. Similarly, this allows the proportion of the second surface 34 in the outer surface of the medical device body 10 to be increased, thereby ensuring a sufficient contact area between each second surface 34 and the inner wall surface of the body cavity. This allows the medical device body 10 to satisfactorily anchor the second surface 34 to the inner wall surface of the body cavity. The range of the tip portion 10a (L1 shown in FIG. 1) referred to here is not particularly limited in the axial direction of the medical device body 10, but means, for example, a range within 30 cm from the tip, and preferably within 25 cm.
[0021] 1 to 2(b), five convex portions 30 are formed, but the number of convex portions 30 is not particularly limited. Five or less convex portions 30 may be formed, or five or more convex portions 30 may be formed. In addition, in the example shown in Figures 1 to 2(b), the convex portion 30 is formed at the tip portion 10a, but the convex portion 30 may be formed at the base portion 10b, or may be formed intermittently in the longitudinal direction of the medical device body 10 from the tip portion 10a to the base portion 10b.
[0022] More specifically, in this embodiment, as shown in Figures 1 and 2(b), the outer peripheral surface of the medical device body 10 has a plurality of protrusions 36 that are arranged at different positions in the axial direction and are each formed in a circular shape, and each of the plurality of protrusions 36 is a convex portion 30. This results in a structure in which each of the first surfaces 32 and each of the second surfaces 34 are formed in a circumferential shape at the distal end portion 10a of the medical device body. This makes it possible to reduce the sliding resistance when the medical device 100 slides toward the distal end over the entire circumferential area of the medical device body 10. Similarly, when the medical device body 10 moves toward the proximal end, the second surface 34, which has a larger frictional resistance, can be anchored to the inner wall surface of the body cavity over the entire circumferential area of the medical device body 10.
[0023] In the present embodiment, each of the ridges 36 rotates 360 degrees in the circumferential direction. However, the ridges 36 may extend in a C-shaped ring shape (less than 360 degrees in the circumferential direction), or multiple ridges may be arranged intermittently in the circumferential direction. Moreover, the ridges 36 are disposed, for example, spaced apart from one another in the axial direction, with non-forming regions 61 interposed between the convex portions 30. The distance between the apexes 65b of the ridges 36 disposed adjacent to one another (D1 shown in FIG. 2(b)) is preferably, for example, 0.02 mm or more and 5 mm or less. The distance between the rising point 65a of one ridge 36 on the side of the other ridge 36 and the rising point 65a of the other ridge 36 on the side of the one ridge 36, among the ridges 36 disposed adjacent to one another (D2 shown in FIG. 2(b)), is preferably, for example, 0.01 mm or more and 4.5 mm or less. However, the ridges 36 may be disposed adjacent to one another in the axial direction, for example. In this case, the distance D2 between the rising point 65a of one ridge 36 on the side of the other ridge 36 among the ridges 36 disposed adjacent to one another is substantially zero. In the present embodiment, as an example, the ridges 36 are disposed at equal intervals in the axial direction. The ridges 36 are formed to have substantially the same dimensions and shapes. Therefore, the distances D1 between the apexes 65b of the ridges 36 are substantially the same, and the distances D2 between the rising points 65a of the ridges 36 are also substantially the same. However, for example, the ridges 36 may be disposed at unequal intervals in the axial direction. The ridges 36 may be formed to have different dimensions and shapes. Therefore, the distances D1 between the apexes 65b of the ridges 36 may be different, and the distances D2 between the rising points 65a of the ridges 36 may also be different.
[0024] In this embodiment, the first surface 32 is an inclined surface inclined with respect to an orthogonal surface 60 (see FIG. 2(b)) perpendicular to the axial direction. In FIG. 2(b), the orthogonal surface 60 is indicated by a two-dot chain line. This results in a configuration in which the first surface 32 is inclined toward the tip side, thereby reducing the sliding resistance when the medical device 100 is inserted into a body cavity. More specifically, each first surface 32 is inclined, for example, in a direction approaching the axial center side of the medical device body 10 toward the tip side. However, the present invention is not limited to this example, and the first surface 32 may be, for example, an orthogonal surface that is orthogonal to the axial direction.
[0025] In this embodiment, the second surface 34 is an inclined surface that is inclined with respect to an orthogonal surface 60 that is orthogonal to the axial direction. This reduces the dynamic frictional force of the second surface 34 against the inner wall surface of the body cavity, making it possible to smoothly remove the medical device body 10 from the body cavity. More specifically, each second surface 34 is inclined, for example, in a direction approaching the axial center side of the medical device body 10 toward the base end side. However, the second surface 34 may be, for example, an orthogonal surface that is orthogonal to the axial direction.
[0026] More specifically, as shown in Fig. 2(a) and Fig. 2(b), in this embodiment, the first surface 32 is in the shape of an arc convex toward the oblique tip side when a straight line 62 (see Fig. 2(b)) connecting the rising point 65a on the tip side and the apex 65b is taken as a reference. Similarly, the second surface 34 is in the shape of an arc convex toward the oblique base end side when a straight line 63 (see Fig. 2(b)) connecting the rising point 65a on the base end side and the apex 65b is taken as a reference. However, for example, the first surface 32 may be inclined toward the tip side at a certain angle, and the second surface 34 may also be inclined toward the base end side at a certain angle. Further, the rear end of each first surface 32 is connected, for example, to the tip of the corresponding second surface 34. However, for example, a pedestal portion (not shown) having a substantially constant height from the non-forming region 61 in the axial direction may be interposed between the first surface 32 and the corresponding second surface 34. In this embodiment, the angle between the orthogonal plane 60 and the first surface 32 (R1 shown in FIG. 2(b)) is the angle between the orthogonal plane 60 and a straight line 62 of the first surface 32. Similarly, the angle between the orthogonal plane 60 and the second surface 34 (R2 shown in FIG. 2(b)) is the angle between the orthogonal plane 60 and a straight line 63 of the second surface 34. As an example, the angle R1 between the orthogonal plane 60 and the first surface 32 and the angle R2 between the orthogonal plane 60 and the second surface 34 are set to be approximately equal to each other. In FIG. 2(b), the straight lines 62 and 63 are each indicated by a two-dot chain line.
[0027] Angle R1 between orthogonal surface 60 and first surface 32 and angle R2 between orthogonal surface 60 and second surface 34 are not particularly limited, but are preferably, for example, not less than 45 degrees and not more than 80 degrees. In the present embodiment, as an example, the angles R1 of the convex portions 30 are set to be substantially equal to each other. However, for example, the angles R1 of the convex portions 30 may be set to be different from each other. Similarly, in the present embodiment, as an example, the angles R2 of the convex portions 30 are set to be substantially equal to each other. However, for example, the angles R2 of the convex portions 30 may be set to be different from each other. The height dimension of each convex portion 30 (H1 shown in FIG. 2(a)) is not particularly limited, but is preferably, for example, 0.01 mm or more and 0.1 mm or less, and more preferably 0.02 mm or more and 0.08 mm or less. The length dimension of each convex portion 30 (L2 shown in FIG. 2(a)) is not particularly limited, but is preferably, for example, 0.01 mm or more and 2 mm or less, and more preferably 0.02 mm or more and 1 mm or less. In the present embodiment, for example, the height dimension H1 and the length dimension L2 of each of the convex portions 30 are set to be substantially equal to each other. However, for example, the height dimension H1 and the length dimension L2 of each of the convex portions 30 may be different from each other.
[0028] In this embodiment, the method for forming the multiple convex portions 30 (protrusions 36) is not particularly limited, but examples include a method of cutting a portion of the surface of the outer layer 14 of the medical device body 10 by laser processing or the like depending on the desired number and dimensions of the convex portions 30, or a method of transferring unevenness by fine processing such as nanoimprinting.
[0029] Furthermore, in this embodiment, of the first surface 32 and the second surface 34, a hydrophilic coating 18 (see FIG. 2(a)) is selectively applied to the first surface 32. This can further reduce the sliding resistance when the medical device body 10 slides toward the distal end. On the other hand, since the hydrophilic coating 18 is not applied to the second surface 34, the second surface 34 can be well anchored to the inner wall surface of the body cavity when the medical device body 10 moves toward the proximal end. 2(a), in this embodiment, the hydrophilic coating 18 is also formed in a non-formation region 61 of the convex-shaped portion 30 on the outer surface of the medical device body 10 (outer layer 14). The hydrophilic coating 18 may be formed, for example, over the entire non-formation region 61 of the medical device body 10, or may be selectively formed in the non-formation region 61 in the tip portion 10a. The material of the hydrophilic coating 18 is not particularly limited, but examples thereof include hydrophilic resin materials such as maleic anhydride polymers such as polyvinyl alcohol (PVA) and copolymers thereof, and polyvinylpyrrolidone.
[0030] For example, the hydrophilic coating 18 may be applied to both the first surface 32 and the second surface 34. In this case, it is preferable that the frictional resistance of the hydrophilic coating 18 applied to the first surface 32 is smaller than the frictional resistance of the hydrophilic coating 18 applied to the second surface 34. By doing so, the anchoring ability of the second surface 34 to the inner wall surface of the body cavity can be ensured, while the medical device body 10 can be smoothly removed from within the body cavity. There is no particular limitation on the method for making the frictional resistance of the hydrophilic coating 18 applied to the first surface 32 smaller than that of the hydrophilic coating 18 applied to the second surface 34, but one example is a method of forming the hydrophilic coating 18 applied to the first surface 32 from a hydrophilic resin material with a smaller frictional resistance. In addition, for example, when 18 is made of a material in which multiple resin materials are mixed, the mixing ratio of the multiple resin materials of the hydrophilic coating 18 applied to the first surface 32 and the mixing ratio of the materials of the hydrophilic coating 18 applied to the second surface 34 may be different from each other.
[0031] In addition, it is also preferable that, of the first surface 32 and the second surface 34, the second surface 34 is selectively roughened. This makes it possible to increase the frictional resistance generated between the inner wall of the body cavity and second surface 34, thereby ensuring sufficient anchoring of second surface 34 to the inner wall surface of the body cavity when liquid is injected into the body cavity. However, for example, both the first surface 32 and the second surface 34 may be roughened. In this case, it is preferable that the surface roughness of the second surface 34 is greater than that of the first surface 32. In this case as well, the frictional resistance generated between the inner wall of the body cavity and the second surface 34 is greater than the frictional resistance generated between the inner wall of the body cavity and the first surface 32, so that the anchoring ability of the second surface 34 to the inner wall surface of the body cavity can be sufficiently ensured.
[0032] When the first surface 32 (or the second surface 34) is roughened, the method for forming the rough surface is not particularly limited, and for example, a method for forming the rough surface by transferring multiple minute projections and recesses that are pre-formed in a mold when injection molding the medical device body 10, or a method using a polishing process or a blasting process can be used.
[0033] Second Embodiment Next, a second embodiment will be described with reference to FIG. 3(a) and FIG. 3(b). The medical device 100 of this embodiment differs from the medical device 100 of the first embodiment described above in the points described below, but in other respects is configured in the same manner as the medical device 100 of the first embodiment described above.
[0034] As shown in Figures 3(a) and 3(b), in this embodiment, the outer peripheral surface of the medical device body 10 has a spiral ridge 36 that advances in the axial direction, and each of the portions of the ridge 36 that are located at different positions in the axial direction is a convex portion 30. With this configuration, it is possible to reduce the sliding resistance when the medical device main body 10 is inserted into a body cavity, while preventing the medical device main body 10 from unintentionally retracting toward the base end when injecting liquid into the body cavity. Here, "each of the parts is a convex portion 30" means that there are a plurality of convex portions 30 arranged at different positions in the axial direction in a longitudinal cross section along the axial direction. Also, "arranged at different positions in the axial direction" means either being adjacent to each other in the axial direction or being spaced apart from each other in the axial direction. In this embodiment, the convex portions 30 are spaced apart from each other in the axial direction, and non-forming regions 61 are interposed between the convex portions 30. For example, when each convex portion 30 is arranged adjacent to each other, there is no non-formation area 61 between each convex portion 30, and the boundary between each convex portion 30 is recessed to a height position equivalent to that of the non-formation area 61.
[0035] More specifically, in this embodiment, as shown in Figure 3(a), a wire 40 having a first inclined surface 41 facing the tip side and a second inclined surface 42 facing the base end side is embedded in the medical device main body 10 in a spiral arrangement that screws in the axial direction, and a convex portion 30 is arranged on the outer surface of the medical device main body 10 at a position corresponding to the wire 40. For example, the wire 40 is entirely embedded in the outer layer 14. The wire 40 is disposed coaxially with the reinforcing layer 16 and disposed radially outward of the reinforcing layer 16. Since the shape of the wire 40 is reflected in the shape of the convex portion 30 when the outer layer 14 is formed, the portion of the outer layer 14 corresponding to the wire 40 is locally thickened toward the outside, thereby forming a spiral ridge 36. In the present embodiment, the number of ridges 36 is one. However, for example, the ridges 36 may be a plurality of ridges arranged in parallel to one another. Furthermore, the windings of the ridges 36 are spaced apart from one another in the axial direction. However, for example, the windings of the ridges 36 may be adjacent to one another in the axial direction.
[0036] As shown in FIG. 3(a), the first inclined surface 41 of the wire 40 is inclined, for example, in a direction approaching the axial center of the medical device main body 10 toward the tip side, and the second inclined surface 42 of the wire 40 is inclined in a direction approaching the axial center of the medical device main body 10 toward the base end side. In the present embodiment, the first surface 32 of the convex portion 30 is constituted by a thick outer surface of a portion of the outer layer 14 corresponding to the first inclined surface 41, and the second surface 34 of the convex portion 30 is constituted by a thick outer surface of a portion of the outer layer 14 corresponding to the second inclined surface 42. Therefore, in a cross section along the axial direction, the first surface 32 of the convex portion 30 is inclined in a direction approaching the axial center of the medical device main body 10 toward the tip side, and the second inclined surface 42 of the wire 40 is inclined in a direction approaching the axial center of the medical device main body 10 toward the base end side.
[0037] Third Embodiment Next, a third embodiment will be described with reference to FIG. 4(a) and FIG. 4(b). The medical device 100 of this embodiment differs from the medical device 100 of the first and second embodiments described above in the points described below, but in other respects is configured in the same manner as the medical device 100 of the first and second embodiments described above.
[0038] 4(a) and 4(b), in this embodiment, the angle R1 between the orthogonal surface 60 and the first surface 32 is larger than the angle R2 between the orthogonal surface 60 and the second surface 34. In other words, the angle R1 between the orthogonal surface 60 and the first surface 32 is more gentle than the angle R2 between the orthogonal surface 60 and the second surface 34. This reduces the sliding resistance when inserting the medical device body 10 into a body cavity. On the other hand, since the second surface 34 has a steeper slope than the first surface 32, the anchoring force of the medical device body 10 can be further increased. Therefore, the medical device 100 can be inserted more smoothly into the body cavity, and when injecting liquid into the body cavity, unintentional retraction of the medical device main body 10 toward the base end can be more reliably prevented.
[0039] In this embodiment, the angle R1 between the orthogonal surface 60 and the first surface 32 is not particularly limited, but is preferably, for example, 55 degrees or more and 85 degrees or less, and more preferably 65 degrees or more and 75 degrees or less. The angle R2 between the orthogonal surface 60 and the second surface 34 is not particularly limited, but is preferably, for example, 25 degrees or more and 65 degrees or less, and more preferably 35 degrees or more and 55 degrees or less. The angle difference between the angle R1 between the orthogonal plane 60 and the first surface 32 and the angle R2 between the orthogonal plane 60 and the second surface 34 is, for example, preferably 20 degrees or more and 50 degrees or less, and more preferably 30 degrees or more and 40 degrees or less.
[0040] [Fourth embodiment] Next, a fourth embodiment will be described with reference to FIG. 5(a) and FIG. 5(b). The medical device 100 of this embodiment differs from the medical device 100 of the above-described first to third embodiments in the points described below, but in other points is configured similarly to the medical device 100 of the above-described first to third embodiments.
[0041] 5(a) and 5(b), in this embodiment, the second surface 34 is an inclined surface inclined with respect to an orthogonal surface 60 perpendicular to the axial direction, and an angle R1 formed between the orthogonal surface 60 and the first surface 32 is smaller than an angle R2 formed between the orthogonal surface 60 and the second surface 34. In other words, the angle R2 formed between the orthogonal surface 60 and the second surface 34 is more gentle than the angle R1 formed between the orthogonal surface 60 and the first surface 32. This ensures the anchoring ability of the second surface 34 to the inner wall surface of the body cavity while reducing the kinetic friction force of the second surface 34 to the inner wall surface of the body cavity, making it possible to smoothly remove the medical device body 10 from the body cavity.
[0042] In this embodiment, the angle R1 between the orthogonal surface 60 and the first surface 32 is not particularly limited, but is preferably, for example, 25 degrees or more and 65 degrees or less, and more preferably 35 degrees or more and 55 degrees or less. The angle R2 between the orthogonal surface 60 and the second surface 34 is not particularly limited, but is preferably, for example, 55 degrees or more and 85 degrees or less, and more preferably 65 degrees or more and 75 degrees or less. The angle difference between the angle R1 between the orthogonal plane 60 and the first surface 32 and the angle R2 between the orthogonal plane 60 and the second surface 34 is, for example, preferably 20 degrees or more and 50 degrees or less, and more preferably 30 degrees or more and 40 degrees or less.
[0043] Although the embodiments have been described above with reference to the drawings, these are merely examples of the present invention, and various configurations other than those described above can also be adopted.
[0044] For example, in the above, an example has been described in which the medical device body 10 has one lumen 20, but the medical device body 10 may have, for example, a plurality of lumens 20. In this case, the inner wall of the medical device body 10 may define each of the plurality of lumens, or a plurality of tubes may be embedded inside the medical device body 10, and the inner walls of the plurality of tubes may define each of the plurality of lumens 20.
[0045] In the above, an example in which the medical device 100 is a non-active catheter has been described, but the medical device 100 may be, for example, an active catheter. In this case, the medical device 100 may be equipped with an operating line (not shown) inserted into a lumen other than the lumen 20, and an operating section (not shown) connected to the base end of the operating line, and may be configured so that the distal end 10a of the medical device main body 10 can be bent by operating the operating section, thereby allowing the medical device 100 to be selectively directed.
[0046] The present embodiment encompasses the following technical ideas. (1) A long medical device body having a lumen, The outer peripheral surface of the medical device body has convex portions including a first surface facing the distal end side and a second surface facing the proximal end side, the convex portions being located at different positions in an axial direction of the medical device body, A medical device, wherein the frictional resistance of the first surface is smaller than the frictional resistance of the second surface. (2) The medical device described in (1), wherein the first surface is an inclined surface inclined with respect to a perpendicular plane perpendicular to the axial direction. (3) The medical device described in (2), wherein the angle between the orthogonal plane and the first plane is greater than the angle between the orthogonal plane and the second plane. (4) The medical device described in any one of (1) to (3), wherein the second surface is an inclined surface inclined with respect to a perpendicular plane perpendicular to the axial direction. (5) The second surface is an inclined surface inclined with respect to an orthogonal plane perpendicular to the axial direction, The medical device according to (1) or (2), wherein the angle between the orthogonal plane and the first plane is smaller than the angle between the orthogonal plane and the second plane. (6) The outer peripheral surface of the medical device body has a plurality of circumferentially extending protrusions arranged at different positions in the axial direction, The medical device according to any one of (1) to (5), wherein each of the plurality of protrusions is a convex portion. (7) The outer peripheral surface of the medical device body has a helical protrusion that advances in the axial direction, The medical device according to any one of (1) to (5), wherein each of the portions of the protrusion arranged at different positions in the axial direction is the convex portion. (8) A medical device according to any one of (1) to (7), wherein two or more of the convex portions are arranged at the tip of the medical device body. (9) A medical device according to any one of (1) to (8), wherein a hydrophilic coating is selectively applied to the first surface of the first surface and the second surface. (10) A hydrophilic coating is applied to both the first surface and the second surface, A medical device described in any one of (1) to (8), wherein the frictional resistance of the hydrophilic coating applied to the first surface is smaller than the frictional resistance of the hydrophilic coating applied to the second surface. (11) The medical device according to any one of (1) to (10), wherein the second surface of the first surface and the second surface is selectively roughened. (12) A medical device described in any one of (1) to (10), wherein both the first surface and the second surface are roughened, and the surface roughness of the second surface is greater than the surface roughness of the first surface. (13) A wire having a first inclined surface facing the tip side and a second inclined surface facing the base end side is embedded in the medical device body in a spiral arrangement that advances in the axial direction, The medical device according to any one of (1) to (12), wherein the convex portion is disposed at a portion of the outer surface of the medical device body corresponding to the wire. [Explanation of symbols]
[0047] 10 Medical device body 10a Tip 10b Base end 11 Marker material 13 Inner layer 14 Outer layer 16 Reinforcement layer 18 Hydrophilic Coating 19 Non-formation area 20 lumens 30 Convex shape part 32 Page 1 34 2nd page 36 protrusion 40 Wire 41 1st slope 42 Second slope 50 Gripping part 51 Connecting part 52 Hub 53 Wings 54 Protector 60 Orthogonal Planes 61 Non-formation area 62, 63 tangent 65a Starting point 65b Vertex 100 Medical Equipment
Claims
1. A long medical device body having a lumen, The outer peripheral surface of the medical device body has convex portions including a first surface facing the distal end side and a second surface facing the proximal end side, the convex portions being located at different positions in an axial direction of the medical device body, The frictional resistance of the first surface is smaller than the frictional resistance of the second surface, The outer peripheral surface of the medical device body has a plurality of circumferentially formed protrusions arranged at different positions in the axial direction, A medical device, wherein each of the plurality of protrusions is a convex portion.
2. The medical device according to claim 1 , wherein the first surface is an inclined surface inclined with respect to an orthogonal plane perpendicular to the axial direction.
3. The medical device according to claim 2 , wherein an angle between the orthogonal plane and the first plane is greater than an angle between the orthogonal plane and the second plane.
4. The medical device according to claim 1 , wherein the second surface is an inclined surface inclined with respect to an orthogonal plane perpendicular to the axial direction.
5. The medical device according to claim 1 , wherein two or more of the convex portions are arranged at the tip of the medical device body.
6. A long medical device body having a lumen, The outer peripheral surface of the medical device body has convex portions including a first surface facing the distal end side and a second surface facing the proximal end side, the convex portions being located at different positions in an axial direction of the medical device body, The frictional resistance of the first surface is smaller than the frictional resistance of the second surface, A medical device, comprising a hydrophilic coating selectively applied to the first surface of the first surface and the second surface.
7. A long medical device body having a lumen, The outer peripheral surface of the medical device body has convex portions including a first surface facing the distal end side and a second surface facing the proximal end side, the convex portions being located at different positions in an axial direction of the medical device body, The frictional resistance of the first surface is smaller than the frictional resistance of the second surface, Both the first surface and the second surface are provided with a hydrophilic coating; A medical device, wherein the frictional resistance of the hydrophilic coating applied to the first surface is less than the frictional resistance of the hydrophilic coating applied to the second surface.
8. A long medical device body having a lumen, The outer peripheral surface of the medical device body has convex portions including a first surface facing the distal end side and a second surface facing the proximal end side, the convex portions being located at different positions in an axial direction of the medical device body, The frictional resistance of the first surface is smaller than the frictional resistance of the second surface, A medical device, wherein the second surface of the first surface and the second surface is selectively roughened.
9. A long medical device body having a lumen, The outer peripheral surface of the medical device body has convex portions including a first surface facing the distal end side and a second surface facing the proximal end side, the convex portions being located at different positions in an axial direction of the medical device body, The frictional resistance of the first surface is smaller than the frictional resistance of the second surface, A medical device in which both the first surface and the second surface are roughened, the surface roughness of the second surface being greater than the surface roughness of the first surface.
10. The second surface is an inclined surface inclined with respect to an orthogonal plane perpendicular to the axial direction, The medical device according to claim 6 , wherein an angle between the orthogonal plane and the first surface is smaller than an angle between the orthogonal plane and the second surface.
11. The outer circumferential surface of the medical device body has a helical protrusion that advances in the axial direction, The medical device according to claim 6 , wherein each of the portions of the ridges arranged at different positions in the axial direction is the convex portion.
12. A long medical device body having a lumen, The outer peripheral surface of the medical device body has convex portions including a first surface facing the distal end side and a second surface facing the proximal end side, the convex portions being located at different positions in an axial direction of the medical device body, The frictional resistance of the first surface is smaller than the frictional resistance of the second surface, a wire having a first inclined surface facing the distal end side and a second inclined surface facing the proximal end side is embedded in the medical device body in a spiral arrangement that advances in the axial direction; The medical device has a convex portion disposed at a portion of the outer surface of the medical device body that corresponds to the wire.
Citation Information
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