Catheter assembly

Abstract

To provide a catheter assembly enabling a user to manipulate a catheter hub so as to adjust the position of the tip of a catheter within a blood vessel.SOLUTION: In a catheter assembly 10, a covering member 22 covers at least a portion of a catheter hub 28. A rotation structure 24 enables the covering member 22 to rotate relative to the catheter hub 28 around the axis 18 of the catheter hub 28. The catheter hub 28 is provided with a portion protruding in the proximal direction further than the proximal end of the covering member 22.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a catheter assembly. [Background technology]

[0002] Patent Document 1 discloses a catheter assembly including an outer needle unit having a hollow catheter and a catheter hub connected to the proximal end of the catheter. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2021-49233 Summary of the Invention [Problem to be solved by the invention]

[0004] After the outer needle unit is placed in a blood vessel of a living body, a liquid such as a medicinal solution is supplied into the blood vessel from outside the living body via a catheter. In this case, the tip of the catheter continuously contacts the same point on the blood vessel wall, and if the contact time is long, the local stress on the blood vessel due to contact with the catheter increases. Furthermore, since the position of the tip of the catheter within the blood vessel is continuously fixed, the medicinal solution flowing out of the catheter increases the stimulation of specific points on the blood vessel. The stimulation by the medicinal solution also results in a local stress on the blood vessel.

[0005] To address this issue, a possible solution is for the user to operate the catheter hub and adjust the catheter tip position within the blood vessel. In this case, it is possible to operate the catheter hub while checking the catheter tip position within the blood vessel from outside the living body using an ultrasound device. However, frequent checking using an ultrasound device is tedious. Furthermore, users tend to avoid adjusting the catheter tip position because they are concerned about the possibility of the catheter becoming dislodged from the blood vessel when adjusting the catheter tip position.

[0006] The present invention aims to solve the above-mentioned problems. [Means for solving the problem]

[0007] (1) An aspect of the present invention is a catheter assembly comprising a catheter member having a hollow catheter and a catheter hub connected to the base end of the catheter, a covering member covering at least a portion of the catheter hub, and a rotation structure that enables the covering member to rotate relative to the catheter hub around the axis of the catheter hub, wherein the catheter hub has a portion that protrudes in the proximal direction beyond the base end of the covering member.

[0008] With this configuration, after the catheter is inserted into a blood vessel of a living body and placed in the body, the portion of the catheter hub that protrudes from the proximal end of the covering member in the proximal direction is rotated around the axis of the catheter hub relative to the covering member after a certain period of time has elapsed or periodically. This allows the circumferential position of the catheter tip within the blood vessel to be displaced. As a result, localized stress on the blood vessel can be reduced.

[0009] (2) In the catheter assembly described in (1) above, the covering member may be cylindrical.

[0010] With this configuration, the catheter hub can be easily rotated in the circumferential direction about the axis relative to the covering member.

[0011] (3) In the catheter assembly described in (1) or (2) above, the rotating structure may have a protrusion formed on one of the outer surface of the catheter hub and the inner surface of the covering member, and a groove formed circumferentially around the axis on the other surface, which engages with the protrusion.

[0012] This configuration allows the catheter hub to be easily rotated in the circumferential direction relative to the covering member.

[0013] (4) In the catheter assembly described in (3) above, the groove portion may be an annular groove.

[0014] This configuration makes it easier to rotate the catheter hub circumferentially relative to the covering member.

[0015] (5) In the catheter assembly described in (3) or (4) above, the protrusion may be a rib formed in the circumferential direction on the one surface and engaging with the groove.

[0016] This configuration makes it easier to rotate the catheter hub circumferentially relative to the covering member.

[0017] (6) In the catheter assembly described in any one of (3) to (5) above, the protrusion portions may be provided in multiple locations on the one surface at intervals in the axial direction of the catheter hub, and the groove portions may be provided in multiple locations on the other surface at intervals in the axial direction.

[0018] This configuration allows the catheter hub to be stably rotated in the circumferential direction relative to the covering member, thereby reducing the deviation of the catheter from its axis.

[0019] (7) In the catheter assembly described in (3) or (6) above, the protrusion portion may be a threaded portion formed on one surface, and the groove portion may be a screw groove formed on the other surface that screws into the threaded portion.

[0020] With this configuration, when the catheter hub is rotated relative to the covering member, the catheter member can be moved not only in the circumferential direction but also in the axial direction, allowing for fine axial adjustment of the catheter tip position.

[0021] (8) In the catheter assembly described in any one of (1) to (7) above, the covering member has a covering main body portion supported by the catheter hub and a tubular insertion portion protruding from the tip of the covering main body portion and insertable into a living body together with the catheter, and the catheter may be inserted through the insertion portion.

[0022] With this configuration, by rotating the catheter hub about its axis relative to the covering member, localized stress on the blood vessel can be effectively reduced. Furthermore, by inserting the insertion section into the living body together with the catheter, the area of ​​direct contact between the catheter and the living body can be reduced. This reduces the stress from the catheter to the living body associated with the rotation of the catheter when the catheter is rotated about its axis.

[0023] (9) In the catheter assembly described in any one of (1) to (8) above, the covering member may have a flat portion provided on the outer circumferential surface of the covering member.

[0024] With this configuration, after inserting the catheter into the living body, the central portion of the tape piece is attached to the flat portion and both ends of the tape piece are attached to the living body, thereby making it possible to easily fix the catheter assembly to the living body.

[0025] (10) In the catheter assembly described in any one of (1) to (8) above, the covering member may have a covering main body portion that covers a portion of the catheter hub, and two plate-shaped portions that protrude from the covering main body portion so as to be spaced apart from each other.

[0026] With this configuration, after inserting the catheter into the living body, the central portion of the tape piece is attached to the covering main body and the two plate-like portions, and both ends of the tape piece are attached to the living body. Alternatively, the central portion of the tape piece is attached to each of the two plate-like portions, and both ends of the two tape pieces are attached to the living body. This makes it possible to easily fix the catheter assembly to the living body. [Effects of the Invention]

[0027] According to the present invention, after a catheter is inserted into a blood vessel of a living body and placed in the body, the portion of the catheter hub that protrudes from the proximal end of the covering member in the proximal direction is rotated around the axis of the catheter hub relative to the covering member after a certain period of time has elapsed or periodically. This allows the circumferential position of the catheter tip within the blood vessel to be displaced. As a result, localized stress on the blood vessel can be reduced. [Brief explanation of the drawings]

[0028] [Figure 1] FIG. 1 is a cross-sectional view of a catheter assembly according to a first embodiment. [Figure 2] 2A is a cross-sectional view taken along the line IIA-IIA in FIG. 1, and FIG. 2B is a partial cross-sectional view showing another configuration of the covering member. [Figure 3] FIG. 3 is an explanatory view showing the puncturing state of the outer needle unit of FIG. [Figure 4] FIG. 4 is a cross-sectional view of the catheter assembly of the second embodiment. [Figure 5] FIG. 5 is an explanatory diagram showing the puncturing state of the outer needle unit of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0029] 1 is a cross-sectional view of a catheter assembly 10 according to a first embodiment. When at least the distal end of the catheter assembly 10 is inserted into a living body 12 (see FIG. 3 ) such as a patient, a portion of the catheter assembly 10 is placed within the living body 12.

[0030] The catheter assembly 10 comprises an outer needle unit 14 and an inner needle unit 16. The outer needle unit 14 and the inner needle unit 16 are connected along the central axis (axis 18) of the catheter assembly 10.

[0031] The outer needle unit 14 includes a catheter member 20, a covering member 22, and a rotating structure 24. The catheter member 20 has a catheter 26 and a catheter hub 28. The inner needle unit 16 includes an inner needle 30 and an inner needle hub 32.

[0032] The catheter 26, catheter hub 28, covering member 22, inner needle 30, and inner needle hub 32 are arranged coaxially with the axis 18. In the following description, the direction along the axis 18 will be referred to as the axial direction. Furthermore, the direction along the axis 18 toward the catheter 26 will be referred to as the distal direction. Furthermore, the direction away from the catheter 26 along the axis 18 (the direction toward the inner needle hub 32) will be referred to as the proximal direction. Furthermore, the direction perpendicular to the axis 18 will be referred to as the radial direction. Furthermore, the direction around the axis 18 will be referred to as the circumferential direction.

[0033] The catheter member 20 is an outer needle member. The catheter 26 is an outer needle. The catheter 26 is a hollow member. The catheter 26 is a tubular member extending in the axial direction. The catheter 26 is flexible. The catheter 26 is made of a material such as a resin material. The tip of the catheter 26 is open toward the tip. The tip of the catheter 26 is the end that is inserted into the living body 12.

[0034] The catheter hub 28 is an outer needle hub. The catheter hub 28 is a tubular member extending in the axial direction. The catheter hub 28 is connected to the proximal end of the catheter 26. The lumen of the catheter 26 and the lumen of the catheter hub 28 are in communication.

[0035] The catheter hub 28 has a first tubular portion 34 and a second tubular portion 36 .

[0036] The first cylindrical portion 34 is the main body of the catheter hub 28. The first cylindrical portion 34 is a cylindrical portion extending in the axial direction. The outer peripheral surface 68 and the inner peripheral surface of the first cylindrical portion 34 are formed in a tapered shape that narrows toward the distal end.

[0037] The second cylindrical portion 36 is the distal end portion of the catheter hub 28. The second cylindrical portion 36 protrudes distally from the distal end surface of the first cylindrical portion 34. The second cylindrical portion 36 is a cylindrical portion having a smaller diameter than the first cylindrical portion 34. The second cylindrical portion 36 is a cylindrical portion extending along the axis 18. The second cylindrical portion 36 is coaxially connected to the first cylindrical portion 34.

[0038] The inner lumens of the first cylindrical portion 34 and the second cylindrical portion 36 are connected to each other. The inner lumens of the first cylindrical portion 34 and the second cylindrical portion 36 form the inner lumen of the catheter hub 28. The base end side of the catheter 26 is inserted into the inner lumen of the second cylindrical portion 36 and fixed to the inner circumferential surface of the second cylindrical portion 36.

[0039] The catheter hub 28 is preferably made of a material harder than the catheter 26. The catheter hub 28 is made of, for example, a resin material.

[0040] The inner needle 30 is a tubular member having sufficient rigidity to puncture the skin 40 (see Figure 3) of the living body 12. The inner needle 30 is inserted through the inner cavities of the catheter 26 and the catheter hub 28. The overall length of the inner needle 30 is sufficiently longer than that of the catheter 26 and the catheter hub 28. The tip of the inner needle 30 protrudes in the distal direction from the tip of the catheter 26. The tip of the inner needle 30 is open toward the distal direction. The base end of the inner needle 30 protrudes in the proximal direction from the base end of the catheter hub 28. The inner needle 30 is made of a metal material such as stainless steel.

[0041] The inner needle hub 32 is a tubular member extending in the axial direction. The distal end of the inner needle hub 32 is inserted into the lumen of the first tubular portion 34 of the catheter hub 28 and is fixed to the inner circumferential surface of the first tubular portion 34. The inner needle hub 32 fixes the proximal end side of the inner needle 30 in a state in which the inner needle 30 passes through the inner needle hub 32. Although not shown, the proximal end of the inner needle 30 protrudes in the proximal direction from the joint with the inner needle hub 32. The proximal end of the inner needle 30 communicates with the outside of the inner needle 30. The inner needle hub 32 is desirably made of the same material as the catheter hub 28. The constituent material of the inner needle hub 32 is, for example, a resin material.

[0042] The covering member 22 covers at least a portion of the catheter hub 28 of the catheter member 20. Specifically, the covering member 22 is a tubular member extending in the axial direction. The covering member 22 is preferably made of the same material as the catheter hub 28. The constituent material of the covering member 22 is, for example, a resin material.

[0043] The covering member 22 has a covering body portion 42 and an insert portion 44 .

[0044] The covering body 42 is a tubular portion that covers a portion of the catheter 26 and a portion of the catheter hub 28. As described above, the base end side of the catheter 26 is fixed to the second tubular portion 36 of the catheter hub 28. The covering body 42 covers the base end side of the catheter 26, the second tubular portion 36, and the distal end side of the first tubular portion 34. The outer peripheral surface 46 of the covering body 42 is tapered toward the distal end. The inner peripheral surface 48 of the covering body 42 is tapered toward the distal end. The inner peripheral surface 48 of the covering body 42 gradually reduces in diameter toward the distal end in accordance with the shapes of the first tubular portion 34 and the second tubular portion 36. The second tubular portion 36 and the distal end side of the first tubular portion 34 are inserted into the lumen of the covering body 42. Therefore, the base end side of the first tubular portion 34 protrudes in the proximal direction beyond the base end of the covering member 22.

[0045] The insertion section 44 is a tubular section that protrudes distally from the distal end of the covering main body section 42. The length of the insertion section 44 in the axial direction is shorter than the length of the inner needle 30 in the axial direction. The inner cavity of the insertion section 44 and the inner cavity of the covering main body section 42 are in communication. The catheter 26 is inserted through the insertion section 44 and the covering main body section 42. The catheter 26 protrudes distally from the distal opening of the insertion section 44.

[0046] The covering member 22 only needs to cover at least a portion of the catheter hub 28. Therefore, the covering member 22 does not have to be cylindrical. The covering member 22 may be an arc-shaped member. Furthermore, the covering main body 42 of the covering member 22 may have an arc-shaped configuration. Furthermore, the covering member 22 is not limited to covering a portion (the distal end side) of the first tubular portion 34 and the second tubular portion 36. The covering member 22 may cover only the first tubular portion 34 or only the second tubular portion 36. Alternatively, the covering member 22 may cover the first tubular portion 34 and a portion of the second tubular portion 36. Alternatively, the covering member 22 may cover the entire catheter hub 28.

[0047] 1 and 2A, the covering member 22 has a flat portion 50. The flat portion 50 is a flat surface provided on the outer peripheral surface 46 of the covering main body 42. In this case, after the catheter 26 is inserted into a blood vessel 54 (see FIG. 3) of the living body 12, the central portion of a piece of tape (not shown) is attached to the flat portion 50, and both ends of the tape are attached to the skin 40 of the living body 12. In this way, the catheter assembly 10 is fixed to the living body 12.

[0048] As shown in FIG. 2B , the covering member 22 may have two plate-shaped portions 52. The two plate-shaped portions 52 protrude from the covering main body portion 42 so as to be spaced apart from each other. In this case, after the catheter 26 is inserted into a blood vessel 54 (see FIG. 3 ) of the living body 12, a central portion of a tape piece is attached to the covering main body portion 42 and the two plate-shaped portions 52, and both ends of the tape piece are attached to the skin 40 of the living body 12. Alternatively, a central portion of a tape piece is attached to each of the two plate-shaped portions 52, and both ends of the two tape pieces are attached to the living body 12. In this way, the catheter assembly 10 is fixed to the living body 12.

[0049] The covering member 22 does not necessarily have to have the flat portion 50 and the two plate-like portions 52. In this case, the outer peripheral surface 46 of the covering main body 42 will be circular. The user fixes the catheter assembly 10 to the living body 12 by attaching the center portion of a tape piece to the outer peripheral surface 46 of the covering main body 42 and then attaching both ends of the tape piece to the skin 40 of the living body 12.

[0050] As shown in FIG. 1, the rotation structure 24 is configured to allow the covering member 22 to rotate relative to the catheter hub 28 about the axis 18 .

[0051] The rotating structure 24 has protrusions 60 and grooves 62. The protrusions 60 are formed on one of the outer peripheral surface 38 of the catheter hub 28 and the inner peripheral surface 48 of the covering body 42 of the covering member 22. The grooves 62 are formed on the other of the outer peripheral surface 38 of the catheter hub 28 and the inner peripheral surface 48 of the covering body 42. The grooves 62 are formed in the circumferential direction on the other surface. The grooves 62 engage with the protrusions 60.

[0052] In this case, the groove 62 may be an annular groove 64. The protrusion 60 may be a rib 66 formed in the circumferential direction on one surface. The rib 66 is engaged with the groove 62.

[0053] Furthermore, a plurality of protrusions 60 may be provided on one surface at intervals in the axial direction, in which case a plurality of grooves 62 are provided on the other surface at intervals in the axial direction.

[0054] 1, ribs 66, which are protrusions 60, are formed on the outer peripheral surface 38 of the catheter hub 28. Also, an annular groove 64, which is a groove portion 62, is formed on the inner peripheral surface 48 of the covering body 42 of the covering member 22.

[0055] Two protrusions 60 (a first protrusion 60a and a second protrusion 60b) are provided axially spaced apart on the outer peripheral surface 38 of the catheter hub 28. That is, the first protrusion 60a is formed on the distal end side of the outer peripheral surface 68 of the first cylindrical portion 34. The second protrusion 60b is formed on the distal end side of the outer peripheral surface 70 of the second cylindrical portion 36.

[0056] Two grooves 62 (a first groove 62a and a second groove 62b) are formed axially spaced apart on the inner circumferential surface 48 of the covering body 42 of the covering member 22. The first groove 62a is formed to face the first protrusion 60a. The second groove 62b is formed to face the second protrusion 60b.

[0057] Therefore, the first protrusion 60a engages with the first groove 62a, and the second protrusion 60b engages with the second groove 62b. This allows the catheter hub 28 to rotate about the axis 18 relative to the covering member 22. Furthermore, the covering member 22 is supported by the catheter hub 28 due to the engagement between the first protrusion 60a and the first groove 62a, and the engagement between the second protrusion 60b and the second groove 62b.

[0058] The grooves 62 may be formed on the outer peripheral surface 38 (outer peripheral surfaces 68, 70) of the catheter hub 28, and the protrusions 60 may be formed on the inner peripheral surface 48 of the covering main body 42.

[0059] Furthermore, when multiple protrusions 60 are provided on the outer peripheral surface 68 of the catheter hub 28, multiple protrusions 60 may be provided on the outer peripheral surface 68 of the first cylindrical portion 34. Alternatively, multiple protrusions 60 may be provided on the outer peripheral surface 70 of the second cylindrical portion 36.

[0060] Furthermore, when multiple grooves 62 are provided on the outer peripheral surface 68 of the catheter hub 28, multiple grooves 62 may be provided on the outer peripheral surface 68 of the first cylindrical portion 34. Alternatively, multiple grooves 62 may be provided on the outer peripheral surface 70 of the second cylindrical portion 36. Alternatively, grooves 62 may be provided on both the outer peripheral surface 68 of the first cylindrical portion 34 and the outer peripheral surface 70 of the second cylindrical portion 36.

[0061] Next, the operation of placing the catheter 26 in the living body 12 using the catheter assembly 10 will be described.

[0062] As shown in FIG. 1, a user prepares a catheter assembly 10 .

[0063] Next, as shown in Figure 3, the user punctures the skin 40 of the living body 12 with the tip of the inner needle 30 (see Figure 1) of the catheter assembly 10. As a result, the tip of the inner needle 30 punctures a blood vessel 54 of the living body 12, and the tip of the catheter 26 is inserted into the blood vessel 54. In this case, the insertion section 44 of the covering member 22 is inserted into the living body 12 together with the catheter 26.

[0064] Next, the user pulls the inner needle unit 16 (see FIG. 1) in the proximal direction while maintaining the position of the outer needle unit 14. This causes the inner needle unit 16 to be pulled out in the proximal direction from the outer needle unit 14 and removed.

[0065] Thereafter, the connection unit 80 is connected to the catheter hub 28 of the outer needle unit 14 placed on the skin 40 of the living body 12. The connection unit 80 has a connector 82 and a tube 84. The connector 82 is connected to the base end of the catheter hub 28. The tube 84 extends from the connector 82 in the base end direction. The tube 84 is connected to a liquid supply device (not shown). The user administers a liquid such as a medicinal solution into the blood vessel 54 through the connection unit 80.

[0066] Next, the user attaches a part of the tape piece to the flat portion 50 (see FIG. 2A) or the two plate-shaped portions 52 (see FIG. 2B), and attaches both ends of the tape piece to the skin 40 of the living body 12. This fixes the outer needle unit 14 to the living body 12.

[0067] With the outer needle unit 14 indwelling in the living body 12, the user rotates the base end side of the catheter hub 28, which protrudes in the base end direction from the base end of the covering main body 42, around the axis 18 relative to the covering member 22 after a certain time has elapsed, or periodically. This allows the position of the tip of the catheter 26 in the circumferential direction within the blood vessel 54 to be displaced.

[0068] The first embodiment has the following advantages.

[0069] As shown in FIGS. 1 and 3 , after inserting the catheter 26 into a blood vessel 54 of the living body 12 and placing the catheter 26 in the living body 12, the user rotates the portion of the catheter hub 28 protruding from the proximal end of the covering member 22 about the axis 18 relative to the covering member 22 after a certain period of time has elapsed or periodically. This allows the distal end position of the catheter 26 to be displaced circumferentially within the blood vessel 54. The displacement of the distal end position of the catheter 26 changes the contact position of the distal end of the catheter 26 with the blood vessel wall. As a result, the distal end of the catheter 26 is prevented from continuously contacting the same location on the blood vessel wall for an extended period of time, thereby reducing local stress on the blood vessel 54 due to contact with the catheter 26. Furthermore, the change in the distal end position of the catheter 26 with the blood vessel wall disperses the stimulation of the blood vessel wall by the liquid (medicinal solution). This reduces the contact of the catheter 26 and the local stress on the blood vessel 54 due to the liquid.

[0070] Because the covering member 22 is cylindrical, the catheter hub 28 can be easily rotated circumferentially about the axis 18 relative to the covering member 22 .

[0071] Of the outer peripheral surface 38 of the catheter hub 28 and the inner peripheral surface 48 of the covering body 42 of the covering member 22, protrusions 60 are formed on one surface, and grooves 62 are formed on the other surface. The grooves 62 are formed in the circumferential direction around the axis 18 and engage with the protrusions 60. This allows the catheter hub 28 to be easily rotated in the circumferential direction relative to the covering member 22.

[0072] Since the groove portion 62 is an annular groove 64, the catheter hub 28 can be rotated circumferentially relative to the covering member 22 more easily.

[0073] The circumferential projections 60 on one surface are ribs 66 that engage with the grooves 62, making it easier to rotate the catheter hub 28 circumferentially relative to the covering member 22.

[0074] A plurality of protrusions 60 are provided on one surface at intervals in the axial direction of the catheter hub 28, and a plurality of grooves 62 are provided on the other surface at intervals in the axial direction. This allows the catheter hub 28 to rotate stably in the circumferential direction relative to the covering member 22. As a result, wobble of the catheter 26 relative to the axis 18 can be reduced.

[0075] The covering body 42 is supported by the catheter hub 28, and the insertion section 44 protrudes from the tip of the covering body 42 and can be inserted into the living body 12 together with the catheter 26. The catheter 26 is inserted through the insertion section 44. By rotating the catheter hub 28 about the axis 18 relative to the covering member 22, localized stress on the blood vessel 54 can be effectively reduced. Furthermore, by inserting the insertion section 44 into the living body 12 together with the catheter 26, the area of ​​direct contact between the catheter 26 and the living body 12 can be reduced. As a result, when the catheter 26 is rotated about the axis 18, the stress from the catheter 26 to the living body 12 associated with the rotation of the catheter 26 can be reduced.

[0076] 2A, the covering member 22 has a flat portion 50 provided on the outer peripheral surface 46 of the covering main body 42. As a result, after the catheter 26 is inserted into the living body 12, the central portion of the tape piece is attached to the flat portion 50, and both ends of the tape piece are attached to the living body 12. This makes it possible to easily fix the catheter assembly 10 to the living body 12.

[0077] As shown in Fig. 1, the covering main body 42 covers a portion of the catheter hub 28. As shown in Fig. 2B, the two plate-shaped portions 52 protrude from the covering main body 42 so as to be spaced apart from each other. As a result, after the catheter 26 is inserted into the living body 12, the central portion of a tape piece is attached to the covering main body 42 and the two plate-shaped portions 52, and both ends of the tape piece are attached to the living body 12. Alternatively, the central portion of a tape piece is attached to each of the two plate-shaped portions 52, and both ends of the two tape pieces are attached to the living body 12. This makes it possible to easily fix the catheter assembly 10 to the living body 12.

[0078] A catheter assembly 90 of the second embodiment will be described with reference to Figures 4 and 5. Note that the same components as those of the catheter assembly 10 of the first embodiment (see Figures 1 to 3) are given the same reference numerals, and detailed description thereof will be omitted.

[0079] 4 and 5, in the catheter assembly 90 of the second embodiment, the protrusion 60 of the rotating structure 24 is a threaded portion 92 formed on one of the outer circumferential surface 38 of the catheter hub 28 and the inner circumferential surface 48 of the covering body 42 of the covering member 22. The groove 62 is a thread groove 94 formed on the other surface and threadably engages with the threaded portion 92.

[0080] 4 and 5, a threaded portion 92 is formed on the outer peripheral surface 68 of the first cylindrical portion 34 of the catheter hub 28. Also, a threaded groove 94 is formed on the inner peripheral surface 48 of the covering body 42. The threaded portion 92 is threadedly engaged with the threaded groove 94.

[0081] In the second embodiment, the threaded portion 92 may be formed on the outer peripheral surface 70 of the second cylindrical portion 36. Also, the threaded portion 92 may be formed from the outer peripheral surface 68 of the first cylindrical portion 34 to the outer peripheral surface 70 of the second cylindrical portion 36.

[0082] In the second embodiment, a thread groove 94 may be formed on the outer peripheral surface 38 of the catheter hub 28, and a thread portion 92 may be formed on the inner peripheral surface 48 of the covering main body portion 42.

[0083] The second embodiment also provides the same effects as the first embodiment. The second embodiment further provides the following effects.

[0084] When the user rotates the catheter hub 28 relative to the covering member 22, the catheter member 20 can be moved not only in the circumferential direction but also in the axial direction, allowing for fine axial adjustment of the tip position of the catheter 26 within the blood vessel 54 of the living body 12.

[0085] Although the present disclosure has been described in detail, the present disclosure is not limited to the above-described individual embodiments. Various additions, substitutions, modifications, partial deletions, etc. are possible to these embodiments without departing from the gist of the present disclosure or the gist of the present disclosure derived from the content of the claims and their equivalents. [Explanation of symbols]

[0086] 10, 90...catheter assembly 18...Axis line 20...Catheter member 22...Covering member 24...Rotating structure 26...catheter 28...catheter hub

Claims

1. a catheter member having a hollow catheter and a catheter hub connected to a proximal end of the catheter; a covering member covering at least a portion of the catheter hub; a rotation structure that allows the covering member to rotate relative to the catheter hub about the axis of the catheter hub; Equipped with A catheter assembly, wherein the catheter hub has a portion that protrudes in the proximal direction beyond the proximal end of the covering member.

2. The catheter assembly according to claim 1, A catheter assembly, wherein the covering member is tubular.

3. The catheter assembly according to claim 1 or 2, The rotating structure includes: a protrusion formed on one of the outer circumferential surface of the catheter hub and the inner circumferential surface of the covering member; a groove formed on the other surface in a circumferential direction around the axis and engaging with the protrusion; A catheter assembly comprising:

4. The catheter assembly according to claim 3, A catheter assembly, wherein the groove portion is an annular groove.

5. The catheter assembly according to claim 3, A catheter assembly, wherein the protrusion is a rib formed in the circumferential direction on the one surface and engages with the groove.

6. The catheter assembly according to claim 3, the protrusions are provided on the one surface at intervals in the axial direction of the catheter hub, A catheter assembly, wherein the groove portion is provided in the other surface at intervals in the axial direction.

7. The catheter assembly according to claim 3, the protrusion is a threaded portion formed on the one surface, A catheter assembly, wherein the groove portion is a thread groove formed on the other surface and threadably engages with the threaded portion.

8. The catheter assembly according to claim 1 or 2, the covering member has a covering main body portion supported by the catheter hub, and a tubular insertion portion protruding from a distal end of the covering main body portion and insertable into a living body together with the catheter, The catheter is inserted through the insertion section.

9. The catheter assembly according to claim 1 or 2, The catheter assembly, wherein the covering member has a flat portion provided on the outer peripheral surface of the covering member.

10. The catheter assembly according to claim 1 or 2, A catheter assembly, wherein the covering member has a covering main body portion that covers a part of the catheter hub, and two plate-shaped portions that protrude from the covering main body portion so as to be spaced apart from each other.

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