Medical device

Abstract

To provide a technique of reducing a load applied to a long body when bending operation of a sheath is performed.SOLUTION: A medical device 1 includes a sheath 6 configured such that bending operation of at least a part thereof can be performed, and a long body. The sheath 6 includes a lumen capable of storing at least a part of the long body. The long body has a first portion 36, and a second portion 38 located on a proximal end side from the first portion 36. The sheath 6 has a third portion 22, and a fourth portion 24 located on the proximal end side from the third portion 22. The first portion 36 is configured not to relatively move to a distal end side from the third portion 22. The second portion 38 is configured not to relatively move to a proximal end side from the fourth portion 24. At least one of the first portion 36 and the second portion 38 relatively moves with respect to the sheath 6 when bending operation of the sheath 6 is performed.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure relates to medical devices. [Background technology]

[0002] Patent Document 1 discloses an endoscope in which a solid-state image sensor is provided at the tip, and signals for the solid-state image sensor are transmitted via a shielded cable. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 5-13483 Summary of the Invention [Problem to be solved by the invention]

[0004] Patent Document 1 describes the provision of a shielding member that surrounds electrical components including a solid-state imaging element and a cable fixing member that fixes the shielded cable to the shielding member in order to prevent disconnection at the connection part of the shielded cable due to an external force being applied to the connection part of the shielded cable when a bending operation (bending operation) of a bending tube such as a sheath is performed during use of the endoscope. However, simply fixing a long body such as a shielded cable may cause a load to be applied to the long body when the sheath is bent.

[0005] The present disclosure has been made in consideration of the above circumstances, and its purpose is to provide a technique for reducing the load applied to an elongated body when a sheath is bent. [Means for solving the problem]

[0006] A medical device according to one embodiment of the present disclosure comprises a sheath, at least a portion of which is configured to be bendable, and an elongated body, wherein the sheath has a lumen capable of accommodating at least a portion of the elongated body, the elongated body having a first portion and a second portion located proximal to the first portion, the sheath having a third portion and a fourth portion located proximal to the third portion, the first portion configured not to move relative to the distal end of the third portion, the second portion configured not to move relative to the proximal end of the fourth portion, and at least one of the first portion and the second portion moving relative to the sheath when the sheath is bent.

[0007] Any combination of the above components, and conversion of the expression of the present disclosure into a method, device, system, etc., are also valid aspects of the present disclosure. [Effects of the Invention]

[0008] The medical device of the present disclosure can reduce the load applied to the elongated body when the sheath is bent. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram schematically illustrating a medical device according to a first embodiment of the present disclosure. [Figure 2] FIG. 2 is a side view schematically showing the distal end region of the medical device shown in FIG. [Figure 3] FIG. 2 is a plan view schematically showing the distal end surface of the medical device shown in FIG. [Figure 4] FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. [Figure 5] 2 is a diagram schematically showing the relative positional relationship between each part of a sheath and a camera module in the medical device shown in FIG. 1. FIG. [Figure 6] 3 is a cross-sectional view along the axial direction, schematically showing a part of the camera shaft shown in FIG. 2, the connecting member shown in FIG. 1, and a part of the cable shown in FIG. [Figure 7]FIG. 10 is a perspective view schematically showing a part of a camera shaft, a connecting member, and a part of a cable in a medical device according to a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] The present disclosure will be described below with reference to the drawings based on preferred embodiments. The embodiments are illustrative and do not limit the present disclosure, and all features and combinations thereof described in the embodiments are not necessarily essential to the present disclosure. The same or equivalent components, parts, and processes shown in each drawing are designated by the same reference numerals, and redundant descriptions will be omitted where appropriate. The scale and shape of each part shown in each drawing are set for convenience to facilitate explanation and should not be interpreted as limiting unless otherwise specified. Furthermore, when terms such as "first" and "second" are used in this specification or claims, unless otherwise specified, these terms do not represent any order or importance, but are intended to distinguish one configuration from another. Furthermore, some components that are not important for explaining the embodiments are omitted from each drawing.

[0011] [First embodiment] FIG. 1 is a diagram schematically illustrating a medical device 1 according to a first embodiment of the present disclosure. The medical device 1 is, for example, an endoscope, and is used to capture images of the inside of a living body, specifically, the bile duct or pancreatic duct. The medical device 1 includes a sheath 6 and a camera module 30 as an elongated body. The sheath 6 includes a shaft 10, a handle 20 on the proximal end side of the shaft 10, and a connecting member 50. In FIG. 1, the tip of the camera module 30 is arranged in a state where it is exposed from the tip (distal end) of the shaft 10.

[0012] The shaft 10 is a long tubular member. An example of the material of the shaft 10 is a flexible material such as resin. The length of the shaft 10 is, for example, 200 mm to 4800 mm. A handle 20 is connected to the base end (proximal end) of the shaft 10. Hereinafter, in the medical device 1 and each of the components constituting the medical device 1, the direction along the axis of the shaft 10 will be referred to as the "axial direction," the direction perpendicular to the axis will be referred to as the "radial direction," and the direction around the axis will be referred to as the "circumferential direction." Furthermore, in the medical device 1 and each of the components constituting the medical device 1, the side along the axial direction where the tip is located relative to the base end of the shaft 10 will be referred to as the "tip side," and the side where the base end is located relative to the tip of the shaft 10 will be referred to as the "base side."

[0013] Although details will be described later, the camera module 30 includes a long camera shaft 32 and a camera head 31 at the tip of the camera shaft 32 (see FIG. 2). The camera head 31 includes an imaging element such as a CMOS (Complementary Metal Oxide Semiconductor) image sensor. The shaft 10 is inserted into the duodenum from the mouth or the like, and is then inserted into the common bile duct and pancreatic duct through the papilla of Vater facing the duodenum. In this state, the camera head 31 of the camera module 30, which is located near the tip of the shaft 10, captures images of the inside of the common bile duct and pancreatic duct.

[0014] The shaft 10 can be intentionally bent by pulling a pull wire 56 (see FIG. 4) fixed in the distal region 10A, which will be described later. That is, at least a portion of the sheath 6 is configured to be bendable. The shaft 10 is configured to be bendable within a desired range by, for example, varying the hardness (e.g., Shore D hardness) of the resin constituting the shaft 10 in the axial direction. The distal region 10A is a region extending a predetermined distance from the distal end of the shaft 10, for example, a region extending 50 mm from the distal end of the shaft 10 toward the base end.

[0015] The handle 20 is operated by a doctor or the like. With the camera head 31 of the camera module 30 disposed near the tip of the shaft 10, the sheath 6 can be bent using the handle 20 to arbitrarily change the imaging range of the camera module 30. A connecting member 50 is connected to the handle 20. When the connecting member 50 is not connected to the handle 20, it constitutes a part of the camera module 30. In this embodiment, when the connecting member 50 is connected to the handle 20 as shown in FIG. 1, the connecting member 50 is treated as a component of the sheath 6 as described above. Details of the connecting member 50 will be described later.

[0016] 2 is a side view schematically showing the distal region 10A of the medical device 1 with the camera head 31 disposed near the distal end of the shaft 10. FIG. 3 is a plan view schematically showing the distal end surface of the medical device 1. As shown in FIG. 3, the distal end surface 15 of the shaft 10 has a camera lumen 13, a treatment tool lumen 17, and two fluid lumens 14, each of which is substantially circular. The camera lumen 13, the treatment tool lumen 17, and the two fluid lumens 14 each extend toward the base end within the shaft 10. The distal end surface 15 is the distal end surface of the shaft 10 and also the distal end surface of the sheath 6.

[0017] A small-diameter, long camera shaft 32 is housed in camera lumen 13, connecting member 50, and handle 20. Camera head 31 forms the tip of camera module 30 and includes an image sensor 34. Image sensor 34 is connected to an external power source, computer, etc. by conductors that pass through camera shaft 32 and cable 35 that extends from connecting member 50 shown in FIG. 1 to the outside on the proximal end side.

[0018] A treatment tool such as forceps is inserted into the treatment tool lumen 17. The fluid lumen 14 supplies water to a diagnostic site or a treatment site.

[0019] 2, the tip of the camera head 31 may be disposed distally of the tip surface 15 of the shaft 10. The tip of the camera head 31 may be disposed at a position coinciding with the tip surface 15 of the shaft 10, or at a position closer to the base end than the tip surface 15 of the shaft 10. The above-mentioned "state in which the tip of the camera module 30 is exposed from the tip of the shaft 10" includes cases in which the tip of the camera head 31 is disposed at any of a position distally of the tip surface 15 of the shaft 10, a position coinciding with the tip surface 15 of the shaft 10, and a position closer to the base end than the tip surface 15 of the shaft 10.

[0020] 2, the shaft 10 includes, in the distal region 10A, a distal tip 11 and a pull wire anchor 12, in that order from the distal end. The distal ends of four pull wires 56 are fixed to the pull wire anchor 12.

[0021] FIG. 4 is a cross-sectional view taken along line AA in FIG. 2. As shown in FIG. 4, the shaft 10 has four pull wire lumens 18 proximal to the pull wire anchor 12. A pull wire 56 is housed in each of the four pull wire lumens 18, and the tips of the four pull wires 56 are fixed to the pull wire anchor 12. Therefore, when any of the pull wires 56 is pulled proximally, the pull wire anchor 12 is pulled proximally at the position where the tip of that pull wire 56 is fixed. As a result, the shaft 10 is compressed in the axial direction at positions corresponding to the pull wires 56 pulled proximally, enabling bending of the shaft 10. When bending the shaft 10, the shaft 10 is compressed axially as a whole, including positions other than the positions corresponding to the pull wires 56 pulled proximally. Therefore, when bending the shaft 10, the tip of the camera module 30 inserted in the camera lumen 13 of the shaft 10 is likely to move relatively toward the tip. Here, the relative movement of the tip of the camera module 30 means that the relative positional relationship between the tip of the camera module 30 and the sheath 6 changes, and the camera module 30 itself does not need to move.

[0022] FIG. 5 is a diagram schematically illustrating the relative positional relationship between the sheath 6 and the camera module 30 in the medical device 1. In FIG. 5, components of the medical device 1 other than the sheath 6 and the camera module 30 are omitted. Furthermore, each component is illustrated simply, and their shape and size are not limited. The camera module 30 has a first component 36 and a second component 38 located proximally relative to the first component 36. The sheath 6 has a third component 22 and a fourth component 24 located proximally relative to the third component 22. As shown in FIG. 5, the third component 22 is located on the shaft 10. In the example shown in FIG. 5, the fourth component 24 is located on the connecting member 50, but the fourth component 24 may be located on the shaft 10 or the handle 20. The first component 36 of the camera module 30 is configured not to move distally relative to the third component 22 of the sheath 6.

[0023] An example of a configuration in which the first portion 36 of the camera module 30 does not move distally relative to the third portion 22 of the shaft 10 will be described with reference to FIG. 2 . In the example shown in FIG. 2 , the first portion 36 is located near the distal end of the camera shaft 32. In the example shown in FIG. 2 , the third portion 22 is located on the pull wire anchor 12. When the distal end of the camera module 30 is easily moved distally relative to the shaft 10 due to a bending operation of the shaft 10 or the like, a force acts on the shaft 10 and the camera module 30 to prevent the first portion 36 from moving distally relative to the third portion 22. For example, the first portion 36 and the third portion 22 may be fixed to each other by joining, screwing, or the like; the outer diameter of the first portion 36 may be larger than the inner diameter of the third portion 22 to prevent the first portion 36 from passing through the camera lumen 13; or the relative movement may be suppressed by frictional force between the first portion 36 and the third portion 22, for example. As long as the first portion 36 is configured not to move relative to the third portion 22 toward the tip side, the above force does not have to act directly on the first portion 36 or the third portion 22, and may act on other portions of the camera module 30 and the shaft 10.

[0024] As shown in Fig. 2, the third section 22 is preferably located near the tip of the shaft 10. The vicinity of the tip of the shaft 10 may be, for example, the tip region 10A shown in Fig. 1. This more effectively prevents the tip of the camera module 30 from moving relative to the sheath 6 toward the tip side when the shaft 10 is bent, compared to when the third section 22 is located closer to the base end than near the tip of the shaft 10.

[0025] When the first portion 36 is located near the third portion 22 in the axial direction, the imaging element 34 can capture an image of the outside through the opening on the distal end side of the camera lumen 13. Even when the shaft 10 is bent, the first portion 36 does not move relative to the third portion 22 toward the distal end and remains located near the third portion 22, so that the imaging element 34 can stably capture an image of the outside.

[0026] In this embodiment, the first portion 36 is configured not to move relatively more distally than the third portion 22, and the second portion 38 is configured not to move relatively more proximally than the fourth portion 24, and at least one of the first portion 36 and the second portion 38 moves relatively to the sheath 6 when the shaft 10 is bent. That is, at least one of the first portion 36 and the third portion 22, and the second portion 38 and the fourth portion 24 are not fixed to each other. This makes it possible to reduce the load applied to the camera module 30 between the first portion 36 and the second portion 38, even when the shaft 10 is compressed in the axial direction due to the bending operation.

[0027] If the first portion 36 is located near the third portion 22 in the axial direction and the second portion 38 is located near the fourth portion 24 in the axial direction, when the shaft 10 is bent, a force acts on the camera module 30 to prevent the first portion 36 from moving relatively further distally than the third portion 22, and a force acts on the camera module 30 to prevent the second portion 38 from moving relatively further proximally than the fourth portion 24. In this case, a large load is likely to be applied to the camera module 30. Therefore, when the shaft 10 is not bent and the first portion 36 is located near the third portion 22 in the axial direction, it is preferable that the second portion 38 be located more distally than the fourth portion 24.

[0028] 6 is an axial cross-sectional view that schematically shows a part of the camera shaft 32, the connecting member 50, and a part of the cable 35. With reference to FIG. 6, an example of a configuration that prevents the second part 38 of the camera module 30 from moving relatively closer to the base end than the fourth part 24 of the sheath 6 will be described.

[0029] In this embodiment, the camera module 30 and the sheath 6 are connected to each other at least via an elastic member 44. The distal end of the elastic member 44 is directly or indirectly connected to the camera module 30. The proximal end of the elastic member 44 is directly or indirectly connected to the sheath 6. When the camera module 30 moves relatively toward the proximal end, the elastic member 44 is compressed in the axial direction. As the elastic member 44 is compressed in the axial direction, a force toward the distal end acts on the camera module 30 due to the restoring force of the elastic member 44. When the elastic member 44 is most compressed in the axial direction, the camera module 30 cannot move relatively toward the proximal end. In this state, the portion of the camera module 30 near the position where the distal end of the elastic member 44 is connected is located closer to the distal end than the portion of the sheath 6 near the position where the proximal end of the elastic member 44 is connected. That is, the portion of the camera module 30 near the position where the tip end side of the elastic member 44 is connected is the second portion 38, and the portion of the sheath 6 near the position where the base end side of the elastic member 44 is connected is the fourth portion 24.

[0030] In the example shown in FIG. 6 , a first tubular member 40 is connected to the proximal end of the camera shaft 32. The distal end of an elastic member 44 is connected to the first tubular member 40, and the elastic member 44 extends proximally beyond the first tubular member 40. A second tubular member 46 is connected to the distal end of a cable 35 connected to a connecting member 50. The proximal end of the elastic member 44 is connected to the second tubular member 46. That is, the distal end of the elastic member 44 is connected to the camera module 30 via the first tubular member 40, and the proximal end of the elastic member 44 is connected to the connecting member 50, which is a component of the sheath 6, via the second tubular member 46 and the cable 35. In the example shown in FIG. 6 , the elastic member 44 is a coil-shaped spring member, but its form is not particularly limited as long as it is an elastic member. The distal end of the elastic member 44 may be directly connected to the camera shaft 32. The proximal end of the elastic member 44 may be directly connected to the sheath 6.

[0031] In this embodiment, the sheath 6 may further include a fifth region 26 located between the third region 22 and the fourth region 24, and the second region 38 may be configured not to move further distally than the fifth region 26. This limits the range in which the second region 38 of the camera module 30 can move relative to the sheath 6 to between the fourth region 24 and the fifth region 26 of the sheath 6, thereby enabling the camera module 30 to be held within an appropriate range relative to the sheath 6.

[0032] Returning to FIG. 6 , when the second part 38 moves relatively toward the distal end, the elastic member 44 is stretched in the axial direction. As the elastic member 44 is stretched in the axial direction, a force toward the proximal end acts on the camera shaft 32 due to the restoring force of the elastic member 44. When the elastic member 44 is in the state where it is most stretched in the axial direction, the second part 38 cannot move relatively toward the distal end. In this state, the part of the sheath 6 near the distal end of the second part 38 is the fifth part 26. In the example shown in FIG. 6 , the fifth part 26 is a part of the connecting member 50 connected to the sheath 6.

[0033] [Second embodiment] A second embodiment of the present disclosure will be described with reference to Fig. 7. In the following embodiments, among the components described in the first embodiment, the same content as in the first embodiment may be applied to the components not described below.

[0034] The medical device according to this embodiment differs from the medical device 1 according to the first embodiment in that it includes a connecting member 52 instead of the connecting member 50. Figure 7 is a perspective view schematically showing a part of the camera shaft 32, the connecting member 52, and a part of the cable 35.

[0035] In this embodiment, the connecting member 52 includes a housing 62. A portion of the camera shaft 32 extends axially within the housing 62. A groove 64 extending axially is formed in the housing 62. A radially extending protrusion 66 is connected to a predetermined portion of the camera shaft 32 located within the housing 62. The protrusion 66 is disposed within the groove 64 and is movable axially. Specifically, the protrusion 66 is movable axially between a proximal-most position within the groove 64 and a distal-most position within the groove 64. When the protrusion 66 is at the proximal-most position within the groove 64, the protrusion 66 abuts against a wall portion constituting the proximal end of the groove 64, preventing it from moving relative to the proximal end. The wall portion constituting the proximal end of the groove 64 at this time is the fourth portion 24, and the portion of the camera shaft 32 at the same position as the protrusion 66 in the axial direction is the second portion 38. When the protrusion 66 is at the most distal position within the groove 64, the protrusion 66 abuts against the wall that forms the distal end of the groove 64, preventing relative movement toward the distal end. The wall that forms the distal end of the groove 64 at this time is the fifth portion 26. The protrusion 66 may be part of the camera shaft 32. In this case, the second portion 38 may be the protrusion 66.

[0036] As shown in Fig. 7, a portion of the protrusion 66 may protrude outside the housing 62. This allows a doctor or other professional to slide the protrusion 66 along the axial direction, thereby relatively moving the second part 38 to a suitable position in the axial direction. In the example shown in Fig. 7, a groove 64 is formed in the housing 62, and the protrusion 66 is connected to the camera shaft 32. However, as long as the above-described relationship between the groove 64 and the protrusion 66 is established, the protrusion 66 may be connected to the housing 62, and the groove 64 may be formed in the camera shaft 32.

[0037] The embodiments of the present disclosure have been described in detail above. The above-described embodiments merely illustrate specific examples of implementing the present disclosure. The content of the embodiments does not limit the technical scope of the present disclosure, and many design modifications, such as changing, adding, or deleting components, are possible within the scope of the concept of the present disclosure defined in the claims. A new embodiment with design modifications will combine the effects of the combined embodiments and modifications. In the above-described embodiments, content that allows such design modifications is emphasized by using notations such as "in this embodiment" or "in this embodiment," but design modifications are also permitted even in content without such notation. Any combination of components included in each embodiment is also valid as an aspect of the present disclosure. Hatching on cross sections in the drawings does not limit the material of the hatched object.

[0038] In the above-described embodiment, the camera module 30 has been described as including the long camera shaft 32 and the camera head 31 at the tip of the camera shaft 32. However, the camera module 30 may be an elongated body as a whole, as long as it includes the image sensor 34. Furthermore, although the camera module 30 has been described as being a separate member from the sheath 6, the image sensor 34 of the camera module 30 may be fixed integrally to the tip of the sheath 6. In this case, it is sufficient that the wiring and other components of the camera module 30 other than the image sensor 34 have the same function as the camera shaft 32 described above.

[0039] In the above-described embodiment, the sheath 6 has been described as including the shaft 10, the handle 20, and the connecting member 50. However, the sheath 6 does not necessarily have to include the connecting member 50. In this case, the fourth portion 24 and the fifth portion 26 may be located on the shaft 10 or on the handle 20.

[0040] The embodiments may be specified by the following items.

[0041] [1st item] a sheath (6) configured so that at least a portion thereof can be bent; an elongated body; The sheath (6) has a lumen (13) capable of accommodating at least a portion of the elongated body, The elongated body has a first portion (36) and a second portion (38) located closer to the base end than the first portion (36), The sheath (6) has a third portion (22) and a fourth portion (24) located closer to the proximal end than the third portion (22), The first portion (36) is configured not to move relative to the third portion (22) toward the tip side, The second portion (38) is configured not to move relative to the fourth portion (24) toward the base end side, At least one of the first portion (36) and the second portion (38) moves relative to the sheath (6) when the sheath (6) is bent. Medical devices (1).

[0042] According to the medical device (1) relating to the first item, even when the sheath (6) is compressed in the axial direction due to a bending operation, at least one of the first portion (36) and the second portion (38) moves relative to the sheath (6), so that the load applied to the elongated body between the first portion (36) and the second portion (38) can be reduced.

[0043] [Second item] The third portion (22) is located near the tip of the sheath (6). Medical devices as described in item 1 (1).

[0044] According to the medical device (1) of the second aspect, the first portion (36) of the elongated body does not move relative to the distal end of the sheath (6) beyond the vicinity of the distal end of the sheath (6). Therefore, compared to when the third portion (22) is located closer to the proximal end than the vicinity of the distal end of the sheath (10), relative movement of the distal end of the elongated body housed in the lumen (13) of the sheath (6) toward the distal end of the sheath (6) with respect to the sheath (10) during bending operation of the sheath (6) can be more effectively prevented.

[0045] [3rd item] The second portion (38) is connected to the sheath (6) via at least an elastic member (44). A medical device as described in item 1 or 2 (1).

[0046] According to the medical device (1) of the third aspect, when the second portion (38) of the elongated body moves relative to the sheath (6) toward the base end of the sheath (6), the second portion (38) is biased toward the distal end of the sheath (6) via the elastic member (44). Therefore, it is possible to reduce the impact on the elongated body and the sheath (6) compared to when the elastic member (44) is not used.

[0047] [4th item] The sheath (6) has a fifth region (26) located between the third region (22) and the fourth region (24), The second portion (38) is configured not to move relative to the fifth portion (26) toward the tip side. A medical device as described in item 1 or 2 (1).

[0048] According to the medical device (1) relating to the fourth item, the range in which the second portion (38) of the elongated body can move relative to the sheath (10) is limited to between the fourth portion (24) and the fifth portion (26) of the sheath (6), so that the elongated body can be held within an appropriate range relative to the sheath (6).

[0049] [Item 5] The elongated body is a camera module (30) including an imaging element (34), When the first portion (36) is located near the third portion (22), the imaging element (34) can capture an image of the outside through the opening at the distal end side of the lumen (13). A medical device (1) according to any one of items 1 to 4.

[0050] The medical device (1) according to the fifth aspect is an endoscope including a camera module (30) as an elongated body. According to the medical device (1) according to the fifth aspect, even when the sheath (6) is bent, for example, the first section (36) does not move relative to the third section (22) toward the distal end side and is positioned near the third section (22), so that external imaging can be stably performed using the imaging element (34). [Explanation of symbols]

[0051] 1...medical device, 6...sheath, 22...third part, 24...fourth part, 26...fifth part, 30...camera module, 34...imaging element, 36...first part, 38...second part, 44...elastic member.

Claims

1. a sheath configured to be at least partially bendable; an elongated body; the sheath has a lumen capable of accommodating at least a portion of the elongated body; the elongated body has a first portion and a second portion located closer to the base end than the first portion, the sheath has a third portion and a fourth portion located closer to the proximal end than the third portion, The first portion is configured not to move relatively further distally than the third portion, the second portion is configured not to move relative to the fourth portion toward the proximal end, At least one of the first portion and the second portion moves relative to the sheath when the sheath is bent. Medical equipment.

2. the third portion is located near the distal end of the sheath; The medical device of claim 1.

3. The second portion is connected to the sheath via at least an elastic member. The medical device of claim 1.

4. the sheath has a fifth portion located between the third portion and the fourth portion; The second portion is configured not to move relatively further distally than the fifth portion. The medical device of claim 1.

5. the elongated body is a camera module including an imaging element, When the first portion is located near the third portion, the imaging element can capture an image of the outside through an opening on the distal end side of the lumen. A medical device according to any one of claims 1 to 4.

Images