Medical device

Abstract

To provide a medical device capable of suppressing damage to a transplanted object transplanted onto a living body lumen.SOLUTION: A medical device 10 includes: an outer long body 20 having a lumen 21 extending in an axial direction; an inner long body 25 inserted into the lumen 21 of the outer long body 20; and a support body 30 having a tip part 31 and a base end part 32 in which a long body part 33 is wound spirally along the axial direction. The tip part 31 of the support body 30 includes a tip fixed part 31a fixed to the inner long body 25. The support body 30 is flexible to be deformed so that in a state of being exposed to the tip side of the outer long body 20, the interval of the body parts 33 adjacent in the axial direction becomes small and the diameter of the support body is expanded.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a medical device for delivering an implant to the tissue of a biological lumen. [Background technology]

[0002] In procedures for delivering implants such as medical sheets or drugs to tissue in a biological lumen, a medical device having a balloon at the tip of an elongated body that is inserted into the biological lumen is sometimes used. The balloon can serve as a support on which the implant can be mounted. The balloon is inserted into the biological lumen in a folded state and expanded at the target site, thereby implanting the implant into the biological tissue. Once the implant is implanted, the balloon is deflated and removed from the biological lumen.

[0003] Because the balloon is folded until it reaches the target site, the implant is also folded, and therefore medical devices that use balloons to deliver implants can potentially damage the implant.

[0004] As a means for loading an implant and delivering it to a target site, it is conceivable to use a stent as a support for the implant, as shown in Patent Document 1, for example. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Special Publication No. 2004-516067 Summary of the Invention [Problem to be solved by the invention]

[0006] When a stent is used as a support for a transplant, the stent places a burden on the biological tissue as it is placed at the target site. Therefore, in a medical device that allows the support to be removed after the transplant into the biological tissue, it is necessary to be able to suppress damage to the transplant.

[0007] The present invention has been made to solve the above-mentioned problems, and has an object to provide a medical device that can suppress damage to a transplant that is implanted into a biological lumen. [Means for solving the problem]

[0008] The medical device (1) according to the present invention, which achieves the above-mentioned object, comprises an outer elongated body having an inner cavity extending in the axial direction, an inner elongated body inserted into the inner cavity of the outer elongated body, and a support having a tip end and a base end and an elongated main body portion spirally wound along the axial direction, wherein the tip end of the support has a tip fixing portion fixed to the inner elongated body, and the support has flexibility to deform while exposed on the tip side of the outer elongated body so as to expand in diameter as the distance between adjacent main body portions in the axial direction decreases. [Effects of the Invention]

[0009] The medical device (1) configured as described above places the transplant on a spiral support, preventing the transplant from folding and preventing friction with the support or other parts before and after the support is expanded, thereby reducing damage to the transplant transplanted into the biological lumen.

[0010] (2) In the medical device of (1) above, the base end of the support may be switchable between a movable state and an immovable state along the axial direction relative to the outer elongated body, and the support may be deformed such that the distance between the main body portions adjacent in the axial direction decreases and the diameter increases by moving the distal end toward the base end while rotating with the inner elongated body while the base end is immovable relative to the outer elongated body. This allows the diameter of the support to be increased by a simple operation.

[0011] (3) The medical device of (2) may further include an intermediate elongated body having a second lumen extending in the axial direction and inserted into the lumen of the outer elongated body to insert the inner elongated body into the second lumen, and the proximal end fixing portion of the support body may be fixed to the intermediate elongated body. This allows the medical device to switch between a movable state and an immovable state of the proximal end of the support body relative to the outer elongated body by moving or stationary the intermediate elongated body relative to the outer elongated body.

[0012] (4) In the medical device of (2) above, the outer elongate body may have a guide portion that guides a movable member along the axial direction, the base end fixing portion of the support body may be fixed to the movable member, and the guide portion may have a locking portion that locks the movable member so that it does not move. This allows the medical device to switch between a movable state and an immovable state of the base end of the support body relative to the outer elongate body by moving the movable member with the guide portion or locking it with the locking portion.

[0013] (5) In any of the medical devices (1) to (4) above, the main body may be strip-shaped with a circumferential width greater than a radial thickness, thereby ensuring flexibility for deformation of the medical device while increasing the area for mounting a transplant.

[0014] (6) In the medical device of (5) above, the main body portion may have an engaging portion on a surface in the thickness direction that engages with an adjacent main body portion, thereby suppressing radial displacement between the main body portions when the support is expanded in diameter, and enabling the support to be reliably deformed into the expanded shape.

[0015] (7) In any of the medical devices (1) to (6) above, the inner elongated body may have a flow lumen through which a fluid flows and a communication part that is located in a region in the axial direction where the support is provided and that communicates the flow lumen with the outside, and the inner elongated body may be connected to a supply part that supplies the fluid to the flow lumen. This allows the fluid required for treatment to be supplied to biological tissue before or after the diameter of the support is expanded.

[0016] (8) In any of the medical devices (1) to (7) above, the inner elongated body may have an indicator at a proximal end thereof that indicates the amount of movement in the axial direction and the rotational direction, thereby enabling the surgeon to grasp the amount of movement of the inner elongated body in the axial direction and the rotational direction during the operation of expanding the diameter of the support body, thereby enabling reliable operation of the medical device. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 2 is a front view of the medical device of the present embodiment, showing the outer elongated body in a perspective view. [Figure 2] FIG. 10 is a front view of a medical device in which the support body is exposed at the distal end side of the outer elongated body, and shows the outer elongated body in a perspective view. [Figure 3] FIG. 10 is a front view of a medical device in which the support body is expanded in diameter at the distal end side of the outer elongated body, and shows the outer elongated body in a perspective view. [Figure 4] FIG. 10 is an enlarged plan view of the vicinity of the base end portion of the inner elongate body provided with an indicator portion. [Figure 5] 4A and 4B are enlarged partial cross-sectional views of a support having an engaging portion, in which FIG. 4A shows the state before diameter expansion and FIG. 4B shows the state after diameter expansion. [Figure 6] FIG. 10 is a front view of a medical device configured to allow a fluid to be sprayed from the distal end of an inner elongate body, showing the outer elongate body in a perspective view. [Figure 7] FIG. 10 is a front view of a medical device in which a support is exposed at the distal end of an outer elongate body and a fluid is sprayed, the view showing the outer elongate body in a perspective view. [Figure 8] FIG. 10 is a front view of a medical device according to a second embodiment, showing an outer elongated body in a perspective view. [Figure 9] 9 is a cross-sectional view taken along the line AA in FIG. 8. [Figure 10] FIG. 1 is a front view of a medical device in which the support body is exposed at the distal end side of the outer elongated body, and shows the outer elongated body in a perspective view. [Figure 11]11 is a front view of the medical device in which the inner elongated body is rotated from the state of FIG. 10, and shows the outer elongated body in a perspective view. [Figure 12] FIG. 10 is a front view of a medical device in which the support body is engaged with the outer elongated body and the diameter of the support body is expanded, and the outer elongated body is shown in a perspective view. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the dimensional proportions in the drawings may be exaggerated for convenience of explanation and may differ from the actual proportions. In addition, in this specification, the side of the medical device 10 that is inserted into a living body will be referred to as the "distal end" or "distal side," and the side that is operated by the operator will be referred to as the "proximal end" or "proximal side."

[0019] The medical device 10 of this embodiment is used in a procedure to deliver a transplant to the tissue of a biological lumen. The transplant is a medical sheet such as a cell sheet, but is not limited to this and may also be a drug. The cells that make up the cell sheet include, for example, somatic stem cells, adult stem cells, mesenchymal stem cells, or cardiomyocytes derived from iPS cells (induced pluripotent stem cells). The somatic stem cells preferably include skeletal myoblasts (myoblast cells). In this embodiment, the drug includes, in addition to drugs with therapeutic effects, cells, exosomes, nucleic acid drugs, etc.

[0020] 1, the medical device 10 includes an outer elongated body 20 having an inner lumen 21 extending in the axial direction, an inner elongated body 25 inserted into the inner lumen 21 of the outer elongated body 20, and a support 30 provided at the distal end of the inner elongated body 25. The inner elongated body 25 is movable along the axial direction relative to the outer elongated body 20. The medical device 10 also includes an intermediate elongated body 27 inserted into the lumen 21 and allowing the inner elongated body 25 to pass through a second lumen 28.

[0021] The support 30 has a distal end portion 31 and a proximal end portion 32, and is formed by spirally winding an elongated main body portion 33 along the axial direction. The main body portion 33 is a strip-shaped member whose circumferential width is greater than its radial thickness. The support 30 is spirally formed such that adjacent supports 30 are spaced apart in the axial direction. The distal end 31 of the support 30 has a distal fixing portion 31a fixed to a position near the distal end of the inner elongated body 25. The proximal end 32 of the support 30 has a proximal fixing portion 32a fixed to a position near the distal end of the intermediate elongated body 27. By moving the intermediate elongated body 27 axially relative to the outer elongated body 20, the proximal end 32 of the support 30 becomes movable relative to the outer elongated body 20. Furthermore, by stationarying the intermediate elongated body 27 relative to the outer elongated body 20, the proximal end 32 of the support 30 becomes immovable relative to the outer elongated body 20. By simultaneously moving the inner elongated body 25 and the intermediate elongated body 27 in the axial direction relative to the outer elongated body 20, the support 30 can move in the axial direction relative to the outer elongated body 27 while maintaining its shape. By moving the inner elongated body 25 in the axial direction relative to the outer elongated body 20 while keeping the intermediate elongated body 27 stationary relative to the outer elongated body 20, the axial length of the spiral support 30 can be changed.

[0022] The support body 30 remains housed in the outer elongated body 20 until it reaches the target site in the biological lumen. The intermediate elongated body 27 extends from the base end of the outer elongated body 20 toward the base end, with its proximal portion exposed. The tip of the intermediate elongated body 27 is located inside the base end portion 32 of the support body 30. The inner elongated body 25 extends from the base end of the intermediate elongated body 27 toward the base end, with its proximal portion exposed. The tip of the inner elongated body 25 extends from the base end of the intermediate elongated body 27 toward the base end, with its proximal portion exposed. The tip of the inner elongated body 25 extends from the tip end portion 31 of the support body 30 toward the distal side.

[0023] The support 30 has a transplant 100 on its outer peripheral surface. The transplant 100 is provided continuously along the length of the main body 33 that forms the support 30. However, the transplant 100 may be divided along the length of the main body 33. The surface of the support 30 may have an uneven shape. This increases the friction between the surface of the support 30 and the transplant 100, thereby preventing the transplant 100 from slipping.

[0024] The outer elongated body 20, the inner elongated body 25, and the intermediate elongated body 27 are formed, for example, from a resin material. The constituent materials are not particularly limited, but examples include polyethylene, polypropylene, fluororesin, polyethylene terephthalate, polymethyl methacrylate, polyamide resin, polystyrene, polycarbonate, polyimide, polyetherimide, polyether ether ketone, polyvinyl chloride, and ABS resin. The outer elongated body 20, the inner elongated body 25, and the intermediate elongated body 27 may be formed from a metal material.

[0025] The support 30 is formed by a main body 33 having a flat cross section and made of a metal material such as stainless steel, tungsten, etc. However, the support 30 may also be made of a resin material.

[0026] The method of use of the medical device 10 will be described below, along with its functions. With the support 30 housed in the outer elongated body 20 as shown in FIG. 1 , the surgeon inserts the distal end of the outer elongated body 20 to the target site in a biological lumen. The surgeon can appropriately confirm the state of the medical device 10 within the biological lumen by, for example, injecting a contrast agent for X-ray imaging or by inserting the medical device 10 under an endoscope. Once the distal end of the outer elongated body 20 reaches the target site, as shown in FIG. 2 , the surgeon moves the inner elongated body 25 and the intermediate elongated body 27 toward the distal end while keeping the outer elongated body 20 stationary, thereby exposing the support 30 fixed to the inner elongated body 25 and the intermediate elongated body 27 at the distal end of the outer elongated body 20.

[0027] Next, as shown in Figure 3, the surgeon rotates the inner elongated body 25 in the circumferential direction while moving it toward the base end, with the intermediate elongated body 27 remaining stationary relative to the outer elongated body 20. The support 30 moves toward the base end while twisting its distal end 31, with the base end 32 immovable relative to the outer elongated body 20. This operation reduces the spacing between axially adjacent main body portions 33, and the support 30 has the flexibility to deform so as to expand in diameter. By expanding the diameter of the support 30, the number of turns in the spiral shape becomes smaller than before the diameter expansion.

[0028] By expanding the support 30 to an outer diameter larger than that of the outer elongated body 20, the medical device 10 can implant the graft 100 into tissue within a biological lumen. Because the graft 100 is spirally arranged on the surface of the support 30 before and after the support 30 is expanded, it is possible to prevent damage caused by folding. Furthermore, in the medical device 10, friction between the graft 100 and the support 30 or other parts does not occur before and after the support 30 is expanded, which also prevents damage to the graft 100. When a balloon is used as a means for delivering the graft 100, the expansion range of the balloon is limited to the stretch range of the membrane. However, the support 30 of the medical device 10 expands its spiral shape by twisting, allowing the expansion range to be adjusted more widely by the amount of rotation. Furthermore, the spiral support 30 can be freely bent, allowing for good bending followability during insertion.

[0029] After the graft 100 has been implanted into the tissue, the surgeon moves the inner elongated body 25 toward the distal end while rotating the support 30 in the opposite direction to that of expansion, thereby returning the support 30 to its original shape. Thereafter, the surgeon moves the inner elongated body 25 and the intermediate elongated body 27 toward the proximal end to store the support 30 in the outer elongated body 20, and removes the medical device 10 from the biological lumen.

[0030] As shown in FIG. 4 , the inner elongated body 25 may have an indicator portion 50 at its proximal end that indicates the amount of axial and rotational movement. The indicator portion 50 includes an axial direction indicator portion 51 displayed at one location on the outer surface of the inner elongated body 25 and multiple rotational direction indicator portions 53 displayed along the circumferential direction of the inner elongated body 25. A scale portion 55 is provided at the proximal end of the intermediate elongated body 27 so as to cover the vicinity of the axial direction indicator portion 51 of the inner elongated body 25. When the inner elongated body 25 is moved toward the proximal end relative to the intermediate elongated body 27 to expand the diameter of the support body 30, the axial direction indicator portion 51 moves relative to the scale portion 55, allowing the surgeon to determine the amount of axial movement of the inner elongated body 25. Furthermore, the rotational direction indicator portion 53 allows the surgeon to determine the amount of rotation of the inner elongated body 25.

[0031] As shown in Fig. 5(a), the main body portion 33 constituting the support body 30 may have an engaging portion 35 on the surface in the thickness direction that can engage with an axially adjacent main body portion 33. The engaging portion 35 may have a shape that can mesh with an axially adjacent main body portion 33. As shown in Fig. 5(b), by engaging the engaging portions 35 with each other, it is possible to prevent radial positional deviation when the spacing between the main body portions 33 becomes narrow and they come into contact, and it is possible to accurately form the expanded diameter shape of the support body 30.

[0032] The medical device 10 can also spray a fluid from its distal end. As shown in Fig. 6, the inner elongated body 25 has a flow lumen 26 through which the fluid flows, and a communication portion 29 that is arranged in the axial direction in the region where the support 30 is provided and that connects the flow lumen 26 to the outside. The communication portion 29 is a through-hole provided in the inner elongated body 25. A plurality of communication portions 29 are provided in the axial and circumferential directions, and the fluid can be sprayed all around the region where the support 30 is provided.

[0033] A fluid supply unit 40 is connected to the proximal end of the inner elongated body 25. The supply unit 40 has a first liquid supply unit 41, a second liquid supply unit 42, and a gas supply unit 43. Fibrinogen liquid is supplied from the first liquid supply unit 41, and thrombin liquid is supplied from the second liquid supply unit 42. Fibrin gel can be formed by mixing the fibrinogen liquid and thrombin liquid. Compressed air is supplied from the gas supply unit 43. As shown in FIG. 7 , with the support 30 exposed at the distal end of the outer elongated body 20, the supply unit 40 mixes the fibrinogen liquid, thrombin liquid, and air, and sprays the mixture through the flow lumen 26 of the inner elongated body 25 and the communication unit 29 to the outside. The sprayed mixed fluid becomes a foamy fibrin gel and adheres to the tissue of the biological lumen. The support 30 is then expanded. At this time, the support 30 is expanded in diameter until the foamy fibrin gel adhering to the tissue solidifies, and then the support 30 is reduced in diameter after the fibrin gel has solidified, thereby adhesively fixing the transplant 100 to the tissue.

[0034] The fluid supplied by the supply unit 40 is not limited to the fibrin gel described above, and any fluid necessary for treatment can be sprayed from the communication unit 29. The fluid may be sprayed either before or after the diameter of the support 30 is expanded.

[0035] Next, a medical device 60 according to a second embodiment will be described. As shown in Fig. 8, the medical device 60 includes an outer elongated body 70 having an inner lumen 71 extending in the axial direction, an inner elongated body 75 inserted into the inner lumen 71 of the outer elongated body 70, and a support 80 provided at the distal end of the inner elongated body 75. The inner elongated body 75 is movable along the axial direction relative to the outer elongated body 70.

[0036] The support body 80 has the same configuration as the support body 30 of the first embodiment, and has a distal end portion 81 and a proximal end portion 82, and is formed by spirally winding a band-shaped main body portion 83. The distal end portion 81 of the support body 80 has a distal end fixing portion 81a that is fixed to the inner elongated body 85. The proximal end portion 82 of the support body 80 has a proximal end fixing portion 82a that is movable in the axial direction relative to the outer elongated body 70.

[0037] 8, the outer elongated body 70 has a guide portion 72 extending along the axial direction. The guide portion 72 extends in the circumferential direction from the tip position and has a locking portion 72a extending in the axial direction from the end portion.

[0038] As shown in Figure 9, the base end fixing portion 82a of the support body 80 is fixed to a movable member 73 that is movable along the axial direction of the guide portion 72 of the outer elongated body 70. The movable member 73 is inserted into the guide portion 72 and has flange-shaped portions that can abut against the inner and outer surfaces of the outer elongated body 70. When the movable member 73 is positioned in the guide portion 72, the base end portion 82 of the support body 80 is movable relative to the outer elongated body 70 by axial movement of the movable member 73. When the movable member 73 is positioned in the locking portion 72a, the base end portion 82 of the support body 80 is immovable relative to the outer elongated body 70.

[0039] As shown in FIG. 10 , the distal end of the medical device 10 is brought to a target site in a biological lumen, and the inner elongated body 75 is moved toward the distal end, thereby exposing the support 80 to the distal side of the outer elongated body 70. At this time, the movable member 73 fixed to the proximal end fixing portion 82a of the support 80 can be moved to the distal position of the guide portion 72. By rotating the inner elongated body 25 in this state, as shown in FIG. 11 , the support 80 fixed to the inner elongated body 25 at the distal end fixing portion 81a also rotates, and the movable member 73 fixed to the support 80 is positioned at the locking portion 72a. By positioning the movable member 73 at the proximal end of the locking portion 72a, the proximal end 82 of the support 80 can be made immovable relative to the outer elongated body 70.

[0040] As shown in Figure 12, when the movable member 73 is positioned at the engagement portion 72a, the inner elongated body 75 is moved toward the base end relative to the outer elongated body 70 while being rotated circumferentially, whereby the support 80 deforms so that the distance between adjacent main body portions 83 in the axial direction becomes smaller and the diameter expands, allowing the transplant 100 to be transplanted into the tissue.

[0041] In the medical device 60 of the second embodiment, the inner elongate body 75 may also have a communication portion 29 to which the supply portion 40 is connected. Furthermore, the main body portion 83 forming the support body 80 may have an engagement portion 35 that engages with an axially adjacent main body portion 83.

[0042] As described above, the medical device 10 according to the present embodiment (1) comprises an outer elongated body 20 having an inner lumen 21 extending in the axial direction, an inner elongated body 25 inserted into the inner lumen 21 of the outer elongated body 20, and a support 30 having a distal end 31 and a proximal end 32 and an elongated main body 33 spirally wound along the axial direction, the distal end 31 of the support 30 having a distal fixed portion 31a fixed to the inner elongated body 25, and the support 30 has flexibility such that it deforms so as to expand in diameter as the spacing between adjacent main bodies 33 in the axial direction decreases while exposed at the distal end of the outer elongated body 20. In the medical device 10 configured in this manner, by placing the transplant 100 on the spiral support 30, the transplant 100 is not folded and no friction occurs between the support 30 and other parts before and after the diameter of the support 30 expands, thereby suppressing damage to the transplant 100 transplanted into a biological lumen.

[0043] (2) In the medical device 10 described in (1) above, the base end 32 of the support 30 may be switchable between a movable state and an immovable state along the axial direction relative to the outer elongated body 20, and the support 30 may be deformed such that the distance between the axially adjacent main body portions 33 decreases and the diameter increases as the base end 32 is immovable relative to the outer elongated body 20 and the distal end 31 moves toward the base end while rotating due to the inner elongated body 25. This allows the medical device 10 to expand the diameter of the support 30 with a simple operation.

[0044] (3) The medical device 10 of (2) above may further include an intermediate elongated body 27 having a second lumen 28 extending in the axial direction and inserted into the lumen 21 of the outer elongated body 20 to insert the inner elongated body 25 into the second lumen 28, and the base end fixing portion of the support body 30 may be fixed to the intermediate elongated body 27. This allows the medical device 10 to switch between a movable state and an immovable state of the base end portion 32 of the support body 30 relative to the outer elongated body 20 by moving or stationary the intermediate elongated body 27 relative to the outer elongated body 20.

[0045] (4) In the medical device 60 described in (2) above, the outer elongated body 70 may have a guide portion 72 that guides the movable member 73 along the axial direction, the base end fixing portion 81a of the support 80 may be fixed to the movable member 73, and the guide portion 72 may have a locking portion 72a that locks the movable member 73 to prevent it from moving. As a result, the medical device 60 can switch the base end portion 32 of the support 30 between a movable state and an immovable state relative to the outer elongated body 20 by moving the movable member 73 with the guide portion 72 or locking it with the locking portion 72a.

[0046] (5) In any of the medical devices 10 described above in (1) to (4), the main body 33 may be strip-shaped with a circumferential width greater than a radial thickness. This allows the medical device 10 to have a large area for mounting the implant 100 while maintaining sufficient flexibility to allow deformation.

[0047] (6) In the medical device 10 described in (5) above, the main body portions 33 may have, on their surfaces in the thickness direction, engagement portions 35 that engage with adjacent main body portions 33. This allows the medical device 10 to suppress radial displacement between the main body portions 33 when the diameter of the support body 30 is expanded, and ensures that the support body 30 can be deformed into a shape with an expanded diameter.

[0048] (7) In the medical device 10 of any one of (1) to (6) above, the inner elongated body 25 may have a flow lumen 26 through which a fluid flows, and a communication part 29 that is arranged in the axial region where the support 30 is provided and that connects the flow lumen 26 to the outside, and the inner elongated body 25 may be connected to a supply part 40 that supplies a fluid to the flow lumen 26. This allows the fluid required for treatment to be supplied to the living tissue before or after the diameter of the support 30 is expanded.

[0049] (8) In the medical device 10 of any of (1) to (7) above, the inner elongated body 25 may have an indicator 50 at the base end that indicates the amount of axial and rotational movement of the inner elongated body 25. This allows the surgeon to grasp the amount of axial and rotational movement of the inner elongated body 25 during the operation of expanding the diameter of the support 30, thereby enabling reliable operation of the medical device 10.

[0050] The present invention is not limited to the above-described embodiment, and various modifications can be made by those skilled in the art within the technical spirit of the present invention. In the above-described embodiment, the support 30 is in a natural state where its diameter is reduced and the axial spacing of the main body 33 is large. The support 30 is expanded in diameter by moving the inner elongated body 25 toward the proximal end and rotating it with the support 30 exposed to the distal end of the outer elongated body 20. In contrast, the support 30 may be in a natural state where its diameter is expanded and it is housed in the outer elongated body 20 with its diameter reduced and the axial spacing of the main body 33 large. The support 30 may be exposed distally of the outer elongated body 20 by the inner elongated body 25, so that the support 30 expands in diameter in a self-expanding manner. [Explanation of symbols]

[0051] 10 Medical Devices 20 External elongated body 25 Inner long body 27 Intermediate long body 30 Support 31 Tip 31a Tip fixing part 32 Proximal end 32a Proximal fixation part 33 Main body 40 Supply section 50 Index section 60 Medical Devices 70 External elongated body 72 Information Department 72a Locking part 73 Moving parts 75 Inner long body 80 Support 81 Tip 81a Tip fixing part 82 Proximal end 82a Proximal fixation part 83 Main body 100 implants

Claims

1. an outer elongated body having an inner lumen extending in an axial direction; an inner elongated body inserted into the inner cavity of the outer elongated body; a support having a tip end and a base end, and an elongated main body portion wound spirally along the axial direction; the distal end portion of the support member has a distal end fixing portion fixed to the inner elongated body, The support body is a medical device having flexibility that allows it to deform so as to expand in diameter as the distance between the main body portions adjacent in the axial direction decreases while exposed at the tip side of the outer elongated body.

2. the base end portion of the support member is switchable between a movable state and an immovable state along the axial direction relative to the outer elongated body, The medical device of claim 1, wherein the support body is deformed so that the distance between adjacent main body portions in the axial direction becomes smaller and the diameter increases as the base end portion is immovable relative to the outer elongated body and the tip portion rotates and moves toward the base end due to the inner elongated body.

3. an intermediate elongated body having a second lumen extending in the axial direction and inserted into the lumen of the outer elongated body to insert the inner elongated body into the second lumen; The medical device according to claim 2 , wherein the proximal end fixing portion of the support is fixed to the intermediate elongated body.

4. the outer elongated body has a guide portion that guides a moving member along the axial direction, a base end fixing portion of the support body is fixed to the moving member; The medical device according to claim 2 , wherein the guide portion has a locking portion that locks the moving member so that it does not move.

5. The medical device according to any one of claims 1 to 4, wherein the main body portion is strip-shaped with a circumferential width greater than a radial thickness.

6. The medical device according to claim 5 , wherein the main body portion has an engaging portion on a surface in the thickness direction that engages with an adjacent main body portion.

7. the inner elongated body has a flow lumen through which a fluid flows, and a communication portion that is disposed in a region in the axial direction where the support body is provided and that communicates the flow lumen with the outside, The medical device according to any one of claims 1 to 4, wherein the inner elongated body is connected to a supply portion that supplies the fluid to the flow lumen.

8. The medical device according to any one of claims 2 to 4, wherein the inner elongated body has an indicator portion at a base end portion thereof that indicates the amount of movement in the axial direction and the rotational direction.

Images