Light radiation medical treatment device

Abstract

Provided is a light radiation medical treatment device that can reliably irradiate a required place in a hollow organ with a laser beam. This light radiation medical treatment device comprises: a catheter 20 that can be inserted into a treatment instrument passage 11b formed in a video scope 11 constituting an endoscope system 10; and a light radiator 30 that has an optical fiber probe 32 capable of being inserted into the catheter 20, and causes a laser beam emitted from a laser device 31 to enter from a proximal end side of the optical fiber probe 32 and to be emitted from a light emission section 32a provided to the distal end side of the optical fiber probe 32, wherein the catheter 20 has a cylindrical body section 21 that can be inserted into a hollow organ L of a living body, and a balloon section 22 that is provided to the distal end side of the body section 21 in a manner allowing expansion and contraction in the radial direction of the body section 21, and can, by expanding, bring an outer peripheral surface at least partially into contact with an inner wall of the hollow organ L, and the laser beam emitted from the light emission section 32a passes through the balloon section 22 and is emitted from the outer surface side of the balloon section 22.

Description

Light irradiation medical device

[0001] The present invention relates to a light irradiation medical device.

[0002] Photodynamic therapy has been known as one of the conventional cancer treatment methods. In photodynamic therapy, a photosensitive substance that has the property of collecting in malignant tumors is administered to a living body, and the site where the photosensitive substance has collected in the living body is irradiated with laser light, causing a photochemical reaction in the photosensitive substance to generate active oxygen, which then kills the malignant tumor.

[0003] In photodynamic therapy, when laser light is irradiated onto a malignant tumor occurring in a hollow organ of a living body, such as esophageal cancer, a videoscope that constitutes an endoscopic system is inserted into the hollow organ, and an optical fiber is inserted into the treatment tool passage of the videoscope so that the tip of the optical fiber is positioned near the malignant tumor.

[0004] When irradiating a malignant tumor located on the inner wall of a hollow organ with laser light, the laser light is irradiated from the radial center of the hollow organ toward the outside. Therefore, as an optical fiber for irradiating a laser light inside a hollow organ, one that emits laser light radially outward from the optical fiber has been considered in order to reliably irradiate the malignant tumor with laser light (see, for example, Patent Document 1).

[0005] Japanese Patent Application Laid-Open No. 2004-258387

[0006] However, even if an optical fiber capable of emitting laser light radially outward is used when irradiating a malignant tumor with laser light, when the hollow organ itself moves or deforms, for example, due to peristaltic movement of the esophagus, the position of the tip of the optical fiber may be shifted in the direction of extension of the hollow organ, making it impossible to accurately irradiate the malignant tumor with laser light. Furthermore, when biological tissue such as mucus present in the hollow organ adheres to the light emitting part of the optical fiber that emits laser light, the laser light reaching the malignant tumor may be attenuated, or the laser light may be absorbed by the attached biological tissue, causing the emitting part to heat up and damage the tip of the optical fiber.

[0007] An object of the present invention is to provide a light irradiation medical device that can reliably irradiate a required location within a hollow organ with laser light.

[0008] The light irradiation medical device of the present invention is a light irradiation medical device that irradiates light at a predetermined location on the inner wall of a hollow organ of a living body, and comprises: a catheter that can be inserted into a treatment tool passage formed in a videoscope that constitutes an endoscopic system; and a light irradiator that has an optical fiber probe that can be inserted into the catheter, and causes light from a light source to enter from the base end side of the optical fiber probe and emit from a light emitting section provided on the tip side of the optical fiber probe.The catheter has a tubular main body section that can be inserted into a hollow organ, and a balloon section that is provided on the tip side of the main body section so that it can expand and contract in the radial direction of the main body section and whose outer surface can abut at least a portion of the inner wall of the hollow organ of a living body by expanding, and the light emitted from the light emitting section passes through the balloon section and is emitted to the outer surface side of the balloon section.

[0009] Furthermore, in the light irradiation medical device of the present invention, it is preferable that when the balloon portion is expanded radially of the main body portion, the base end side end of the main body portion extends along the radial direction of the main body portion.

[0010] In the light irradiation medical device according to the present invention, it is preferable that the light emitting section emits light radially outward from the tip end side of the optical fiber probe.

[0011] In the light irradiation medical device according to the present invention, it is preferable that an air layer is formed on the outer surface side of the light emitting portion of the optical fiber probe.

[0012] In the light irradiation medical device according to the present invention, it is preferable that the optical fiber probe is movable relative to the main body of the catheter in the axial direction of the main body.

[0013] In the light irradiation medical device according to the present invention, it is preferable that the optical fiber probe has an axial position display unit that displays the axial position of the catheter relative to the main body unit.

[0014] In the light irradiation medical device according to the present invention, it is preferable that the optical fiber probe is rotatable relative to the main body of the catheter in a circumferential direction of the main body.

[0015] In the light irradiation medical device according to the present invention, it is preferable that the optical fiber probe has a rotational position display unit that displays the circumferential rotational position of the catheter relative to the main body unit.

[0016] According to the present invention, by expanding the balloon portion and abutting it against the inner wall of the hollow organ, it is possible to position the distal end of the catheter in the direction of extension of the hollow organ, so that even if the hollow organ undergoes peristaltic movement or other such movement, it is possible to prevent the laser light irradiation position from shifting in the direction of extension of the hollow organ, and it is possible to reliably irradiate the desired location within the hollow organ with the laser light. Furthermore, because the light emitting portion is located inside the balloon portion, it does not come into contact with the inner wall of the hollow organ, which prevents mucus from burning to the light emitting portion and makes it possible to continue irradiating the laser light using the same optical fiber probe for a long period of time.

[0017] FIG. 1 is a schematic diagram of a light irradiation medical device according to one embodiment of the present invention. FIG. 2 is a perspective view of the tip of a videoscope according to one embodiment of the present invention. FIG. 3 is a view illustrating the expansion and contraction state of a balloon portion of a catheter according to one embodiment of the present invention. FIG. 4 is a cross-sectional view illustrating the structure of a catheter according to one embodiment of the present invention. FIG. 5 is a side view of an optical fiber probe illustrating irradiated laser light according to one embodiment of the present invention. FIG. 6 is a side view of the tip side of the optical fiber probe illustrating the structure of a light emitting section according to one embodiment of the present invention. FIG. 7 is a side view of the tip side of the optical fiber probe illustrating another structure of the light emitting section according to one embodiment of the present invention. FIG. 8 is a side view of an optical fiber probe according to another embodiment of the present invention.

[0018] Figures 1 to 7 show one embodiment of the present invention: Figure 1 is a schematic diagram of a light irradiation medical device, Figure 2 is a perspective view of the tip of a videoscope, Figure 3 is a view illustrating the expansion and contraction state of a balloon portion of a catheter, Figure 4 is a cross-sectional view illustrating the structure of the catheter, Figure 5 is a side view of an optical fiber probe illustrating the irradiated laser light, Figure 6 is a side view of the tip of the optical fiber probe illustrating the structure of the light emitting portion, and Figure 7 is a side view of the tip of the optical fiber probe illustrating other structures of the light emitting portion.

[0019] The light irradiation medical device 1 of this embodiment is used in photodynamic therapy, which is one of the cancer treatment methods. Photodynamic therapy involves administering a photosensitive substance that has the property of concentrating in malignant tumors to a living body, and irradiating the malignant tumor C, which is a predetermined location in the living body where the photosensitive substance has concentrated, with laser light, thereby causing a photochemical reaction in the photosensitive substance to generate active oxygen, which then kills the malignant tumor C. The light irradiation medical device 1 of this embodiment is particularly effective in treating malignant tumors C that have developed on the inner wall of a hollow organ L of a living body, such as esophageal cancer.

[0020] As shown in Figure 1, the light irradiation medical device 1 includes an endoscopic system 10 that can check the condition inside a tubular organ L through video, and a catheter 20 and a light irradiator 30 that are used together with the endoscopic system 10.

[0021] The endoscope system 10 comprises a video system main body (not shown) having a recording device, a display device, a light source device, etc., and a videoscope 11 whose tip side is inserted into a living body.

[0022] The videoscope 11 is made of a flexible tubular member with a total length of, for example, 140 cm. The videoscope 11 can be bent at its distal end in any direction to orient the distal end. A camera lens 11a is attached to the distal end of the videoscope 11, and image signals captured by the camera are transmitted to the video system main body, where the images captured by the camera are displayed on a display device or recorded on a recording device. The videoscope 11 also has a treatment tool passage 11b along its extension direction for inserting treatment tools used to treat an affected area of ​​a living body. A treatment tool port 11b1 is formed at the distal end, allowing the treatment tool to be inserted and retracted. The treatment tool passage 11b has an inner diameter of, for example, 2.8 mm. The camera lens 11a and treatment tool port 11b1 are located on the end face of the distal end of the videoscope 11, as shown in FIG. 2 .

[0023] As shown in FIG. 1, the catheter 20 has a tubular main body 21 that can be inserted into the treatment instrument passage 11b of the videoscope 11, and a balloon portion 22 that is expandable and contractible at the tip side of the main body 21.

[0024] The main body 21 is a tubular member through which a fluid such as water or saline used to expand or contract the balloon 22 and an optical fiber probe (described later) of the light irradiator 30 can be inserted. The main body 21 has a total length of, for example, 200 cm.

[0025] As shown in Fig. 4(a), the main body 21 may be, for example, a double tube made up of an outer tube 21a located on the outer periphery and an inner tube 21b located on the inner periphery of the outer tube 21a. In the main body 21 shown in Fig. 4(a), a fluid used to expand and contract the balloon portion 22 flows between the outer tube 21a and the inner tube 21b, and an optical fiber probe of the light irradiator 30 is inserted into the inner tube 21b. In addition, the outer tube 21a of the main body 21 shown in Fig. 4(a) has a portion located inside the balloon portion 22 on the tip side removed, so that the space between the outer tube 21a and the inner tube 21b is in communication with the interior space of the balloon portion 22.

[0026] Furthermore, the main body 21 may be, for example, one that is made up of a single tubular portion 21c as shown in Fig. 4(b). The main body 21 shown in Fig. 4(b) allows a fluid used to expand and contract the balloon portion 22 to flow inside the tubular portion 21c, and an optical fiber probe of the light irradiator 30 is inserted through the tubular portion 21c. The tubular portion 21c of the main body 21 shown in Fig. 4(b) has a portion of its tip side that is located inside the balloon portion 22 removed, so that the space on the inner periphery of the tubular portion 21c is in communication with the internal space of the balloon portion 22.

[0027] Furthermore, the main body 21 may be, for example, one that includes one tubular portion 21d having two passages 21d1 and 21d2, as shown in Figures 4(c) and 4(d). In the main body 21 shown in Figures 4(c) and 4(d), the fluid used to expand and contract the balloon portion 22 flows through one passage 21d1, and the optical fiber probe of the light irradiator 30 is inserted through the other passage 21d2. Here, as shown in Figures 4(c) and 4(d), the passage 21d1 through which the fluid used to expand and contract the balloon portion 22 flows may have a cross-sectional shape that is, for example, a circular cross-section as shown in Figure 4(c) or a cross-sectional shape formed by combining a pair of arcs as shown in Figure 4(d). The shape is not limited as long as it has a flow path cross-sectional area that allows the fluid to flow through. In addition, the tube portion 21d of the main body portion 21 shown in Figures 4(c) and 4(d) has a portion removed that is located inside the balloon portion 22 at the tip side, and the passage 21d1 of the tube portion 21d is connected to the internal space of the balloon portion 22.

[0028] The balloon portion 22 is a compliant balloon made of a flexible, colorless, transparent resin material such as polyurethane, nylon, or isoprene. The balloon portion 22 is disposed at the distal end of the main body portion 21 so as to circumferentially surround the main body portion 21. The balloon portion 22 is formed to have a size of, for example, 30 mm to 60 mm in the extension direction of the main body portion 21. As shown in FIG. 3 , the balloon portion 22 is folded at the distal end of the main body portion 21 in a contracted state and is capable of passing through the treatment instrument passage 11b of the videoscope 11. Furthermore, the contracted balloon portion 22 expands radially of the main body portion 21 by injecting a fluid therein. The expanded balloon portion 22 has an outer diameter of, for example, 25 mm to 40 mm, and at least a portion of the balloon portion 22 is capable of abutting against the inner wall surface of the tubular organ L. In terms of effectively positioning the distal end of the catheter 20 relative to the hollow organ L, it is advantageous for the balloon portion 22 in the expanded state to have a larger contact area with the inner wall surface of the hollow organ L. In terms of effectively positioning the distal end of the catheter 20 relative to the hollow organ L, it is advantageous for the balloon portion 22 in the expanded state to have more contact points with the inner wall surface of the hollow organ L in the circumferential direction, and it is particularly advantageous for the balloon portion 22 to abut at opposing positions on the inner wall surface of the hollow organ L. In terms of irradiating the malignant tumor C in the hollow organ L with laser light, it is advantageous for the balloon portion 22 in the expanded state to have a larger contact area with the malignant tumor C. In the expanded state, the balloon portion 22 has a shape such that the end portion on the base end side in the axial direction of the main body portion 21 extends along the radial direction of the main body portion 21. In the expanded state, the balloon portion 22 of this embodiment has a shape such that the end portions on both axial ends of the main body portion 21 extend along the radial direction of the main body portion 21. The balloon portion 22, in its expanded state, has flexibility that allows it to come into close contact with the lens 11a at the tip of the videoscope 11. The camera captures images of the inside of the tubular organ L through the balloon portion 22 in its expanded state.

[0029] Here, at least the distal end side of the main body 21 and the balloon 22 are formed of a transparent material that can transmit the laser light output from the light irradiator 30. At least the distal end side of the main body 21 and the balloon 22 are desirably formed of a material that is transparent to visible light (having a wavelength in the range of 400 nm to 700 nm) so that the inner wall of the luminal organ L can be visually confirmed through an image captured by a camera. The materials that constitute the distal end side of the main body 21 and the balloon 22 are desirably selected so that the transmittance of the laser light that passes through the main body 21 and the balloon 22 is, for example, 80% or more.

[0030] As shown in FIG. 1, the light irradiator 30 includes a laser device 31 for generating laser light, and an optical fiber probe 32 for irradiating the laser light generated by the laser device 31 .

[0031] The laser device 31 amplifies light in an oscillator tube and outputs laser light. The laser device 31 outputs laser light having a wavelength in the range of 300 nm to 1000 nm, for example.

[0032] The optical fiber probe 32 is an optical fiber having a light emitting portion 32a that emits laser light incident from the base end toward the outside in the radial direction of the tip end. The optical fiber probe 32 is an optical fiber having a total length of, for example, 300 cm and an outer diameter of, for example, 0.4 mm to 1.5 mm. The optical fiber probe 32 may be, for example, an optical fiber whose core and cladding are made of quartz glass, an optical fiber whose outer periphery of a quartz glass core is covered with a cladding made of hard polymer, or an optical fiber whose core and cladding are made of a resin material.

[0033] The optical fiber probe 32 can be inserted into the main body 21 of the catheter 20, and is rotatable in the circumferential direction relative to the main body 21 and movable in the extension direction.

[0034] When the laser light emitted from the light emitting portion 32a of the optical fiber probe 32 is irradiated onto an irradiation surface 15 mm away from the light emitting portion 32a, it is preferable that the laser light irradiate an area in which the size R1 of the optical fiber probe 32 in the extension direction is 20 mm and the size R2 in the radial direction is 10 mm, as shown in Figure 5.

[0035] Here, as shown in Figure 6(a), the light emitting portion 32a of the optical fiber probe 32 has a structure in which a planar reflecting surface 32a1 is formed at the tip of the optical fiber probe 32 and extends obliquely with respect to the extension direction and radial direction of the optical fiber probe 32, and the laser light is reflected at the reflecting surface 32a1, thereby emitting the laser light radially outward from the optical fiber probe 32.

[0036] As shown in Figure 6 (b), the light emitting section 32a of the optical fiber probe 32 has a curved reflecting surface 32a2 at the tip of the optical fiber probe 32, which extends obliquely with respect to the extension direction and radial direction of the optical fiber probe and protrudes outward, and has a structure in which laser light is reflected on the reflecting surface 32a2, thereby emitting laser light radially outward from the optical fiber probe 32.

[0037] As shown in Figure 6 (c), the light emitting portion 32a of the optical fiber probe 32 has a spherical portion 32a3 formed at the tip of the optical fiber probe 32, and a curved reflective surface 32a4 extending obliquely with respect to the extension direction and radial direction of the optical fiber probe 32 and protruding outward.The laser light is reflected by the reflective surface 32a4 and refracted by the spherical portion 31a3, thereby emitting the laser light radially outward from the optical fiber probe 32.

[0038] As shown in Figure 7 (a), the light emitting portion 32a of the optical fiber probe 32 has a structure in which a planar mirror surface 32a5 is formed at the tip of the optical fiber probe 32, and the laser light is reflected at the mirror surface 32a5, thereby emitting the laser light radially outward from the optical fiber probe 32.

[0039] As shown in FIG. 7( b), the light emitting portion 32 a of the optical fiber probe 32 is formed by performing processing such as roughening or processing to form fine grooves around the outer periphery of the tip side of the optical fiber probe 32, and has a structure that emits laser light around the tip side of the optical fiber probe 32.

[0040] As shown in Figure 7 (c), the light emitting portion 32a of the optical fiber probe 32 is processed by roughening the outer periphery of the tip side of the optical fiber probe 32 in the circumferential direction, or by processing such as forming fine grooves, and a part of the processed part is covered with a shielding member 32a6, so that laser light is emitted from a part of the circumferential direction of the tip side of the optical fiber probe 32.

[0041] As shown in FIG. 7(d), the light emitting portion 32a of the optical fiber probe 32 has a structure in which a spherical ball lens 32a7 is formed at the tip of the optical fiber probe 32, and the laser light is reflected and refracted by the ball lens 32a7, thereby emitting the laser light radially outward from the optical fiber probe 32.

[0042] An air layer is formed on the outer surface side of the light emitting portion 32a of the optical fiber probe 32. In the main body 21 of the catheter 20 shown in Figure 4(a), the air layer is the gap between the outer surface of the light emitting portion 32a and the inner wall surface of the inner tube portion 21b. In the main body 21 of the catheter 20 shown in Figure 4(b), the fluid used to expand and contract the balloon portion 22 flows through the space inside the tube portion 21c, and the optical fiber probe 32 is inserted through it. Therefore, by arranging a covering member covering the light emitting portion 32a at a distance from the outer surface of the light emitting portion 32a, an air layer is formed on the outer surface side of the light emitting portion 32a. Furthermore, in the main body 21 of the catheter 20 shown in Figures 4(c) and 4(d), the air layer is the gap between the outer surface of the light emitting portion 32a and the inner wall surface of the passage 21d2.

[0043] When using the light irradiation medical device 1 configured as described above to perform photodynamic therapy on a malignant tumor C that has developed on the inner wall of a tubular organ L, such as the esophagus of a living organism, a photosensitive substance is first administered to the living organism, and then the videoscope 11 of the endoscopic system 10 is inserted through the mouth of the living organism that has been administered the photosensitive substance, and the tip of the videoscope 11 is positioned near the malignant tumor C in the tubular organ L.

[0044] Next, the catheter 20 with the optical fiber probe 32 inserted therein is inserted into the treatment tool passage 11 b of the videoscope 11 , and the distal end side is projected from the treatment tool port 11 b 1 at the distal end of the videoscope 11 .

[0045] In this state, fluid is supplied to the balloon portion 22 via the catheter 20 to expand the balloon portion 22, and the balloon portion 22 is brought into contact with the inner wall of the hollow organ L containing the malignant tumor C. As a result, the distal end of the catheter 20 is positioned relative to the extension direction of the hollow organ L.

[0046] After positioning the tip side of the catheter 20 in the extension direction of the luminal organ L, laser light is emitted from the light emitting portion 32a of the optical fiber probe 32, and while adjusting the position of the optical fiber probe 32 in the extension direction and circumferential direction of the catheter 20, the laser light is irradiated onto the malignant tumor C through the main body portion 21 and balloon portion 22 of the catheter 20.

[0047] Here, the positioning of the tip of the videoscope 11 in the luminal organ L, the positioning of the tip of the catheter 20, and the positioning of the tip of the optical fiber probe 32 are performed while checking the image captured by the camera through the lens 11a located at the tip of the videoscope 11 on the video system main body of the endoscopic system 10.

[0048] As described above, the light irradiation medical device of this embodiment is a light irradiation medical device 1 that irradiates a predetermined location (malignant tumor C) on the inner wall of a hollow organ L of a living body with laser light, and includes: a catheter 20 that can be inserted into a treatment instrument passage 11 b formed in a videoscope 11 that constitutes a component of an endoscopic system 10; and a light irradiator 30 that has an optical fiber probe 32 that can be inserted into the catheter 20 and that causes laser light emitted from a laser device 31 to enter the base end side of the optical fiber probe 32 and emit it from a light emitting section 32 a provided on the distal end side of the optical fiber probe 32. The catheter 20 has a tubular main body 21 that can be inserted into the hollow organ L, and a balloon section 22 that is provided on the distal side of the main body 21 so as to be expandable and contractible in the radial direction of the main body 21 and whose outer peripheral surface can abut at least a portion thereof on the inner wall of the hollow organ L of a living body by expanding. The laser light emitted from the light emitting section 32 a passes through the balloon section 22 and is emitted to the outer surface side of the balloon section 22.

[0049] As a result, by expanding the balloon portion 22 and bringing it into contact with the inner wall of the hollow organ L, it is possible to position the tip side of the catheter in the extension direction of the hollow organ L. Therefore, even when, for example, peristaltic movement or other movement occurs in the hollow organ L, it is possible to prevent the laser light irradiation position from shifting in the extension direction of the hollow organ L, and it is possible to reliably irradiate the laser light to the required location within the hollow organ L. Furthermore, because the light emitting portion 32 a is located inside the balloon portion 22, the light emitting portion 32 a does not come into contact with the inner wall of the hollow organ L. This prevents mucus from burning to the light emitting portion 32 a, and it is possible to continue irradiating the laser light using the same optical fiber probe 32 for a long period of time.

[0050] In addition, it is preferable that when the balloon portion 22 is expanded in the radial direction of the main body portion 21, the end portion on the base end side of the main body portion 21 extends along the radial direction of the main body portion 21.

[0051] This makes it possible to position the components constituting the balloon portion 22 in a direction perpendicular to the optical axis of the lens 11a of the camera provided at the tip of the videoscope 11, thereby enabling the light emitting portion 32a of the optical fiber probe 32 and the malignant tumor C in the luminal organ L to be accurately photographed by the camera through the balloon portion 22. At this time, by bringing the end of the balloon portion 22 on the base end side of the main body portion 21 into close contact with the lens 11a, it is possible to ensure a clear field of view.

[0052] Preferably, the light emitting portion 32 a emits laser light radially outward from the tip end of the optical fiber probe 32 .

[0053] This makes it possible to irradiate the malignant tumor C with laser light without bending the tip of the videoscope 11 and pointing the tip toward the malignant tumor C inside the tubular organ L, making it possible to reliably irradiate the malignant tumor C with laser light even inside a tubular organ L with a small inner diameter.

[0054] It is also preferable that an air layer be formed on the outer surface side of the light emitting portion 32 a of the optical fiber probe 32 .

[0055] This makes it possible to make the refractive index of light at the light emitting portion 32a constant, and therefore makes it possible to maintain a uniform state of the laser light emitted from the light emitting portion 32a.

[0056] Furthermore, it is preferable that the optical fiber probe 32 is movable relative to the main body 21 of the catheter 20 in the axial direction of the main body 21 .

[0057] This makes it possible to adjust the irradiation position of the laser light in the extension direction inside the tubular organ L, so that the malignant tumor C can be reliably irradiated with the laser light.

[0058] Furthermore, it is preferable that the optical fiber probe 32 be rotatable relative to the main body 21 of the catheter 20 in the circumferential direction of the main body 21 .

[0059] This makes it possible to adjust the irradiation position of the laser light in the circumferential direction within the tubular organ L, thereby making it possible to reliably irradiate the malignant tumor C with the laser light.

[0060] FIG. 8 is a side view of an optical fiber probe according to another embodiment of the present invention.

[0061] The optical fiber probe 32 of this embodiment has scales along the axial direction on both the tip and base ends, and has an axial position display section 32b that displays the axial position of the catheter 20 relative to the main body 21.

[0062] The optical fiber probe 32 also has a rotational position display section 32c that displays a scale along the circumferential direction on the base end side and displays the rotational position of the catheter 20 relative to the main body section 21 in the circumferential direction.

[0063] In the light irradiation medical device 1 configured as described above, the user can adjust the axial position of the optical fiber probe 32 relative to the main body 21 of the catheter 20 while directly viewing the axial position display unit 32b on the base end side of the optical fiber probe 32. In addition, the user of the light irradiation medical device 1 can adjust the axial position of the optical fiber probe 32 relative to the main body 21 of the catheter 20 while viewing the axial position display unit 32b on the tip end side of the optical fiber probe 32 via the camera of the videoscope 11.

[0064] In addition, the user of the light irradiation medical device 1 can adjust the circumferential rotational position of the optical fiber probe 32 relative to the main body 21 of the catheter 20 while directly visually checking the rotational position display section 32c on the base end side of the optical fiber probe 32.

[0065] Thus, according to the light irradiation medical device 1 of this embodiment, as in the above embodiment, by expanding the balloon portion 22 and abutting it against the inner wall of the tubular organ L, it is possible to position the tip side of the catheter in the extension direction of the tubular organ L.Therefore, even if, for example, peristaltic movement or other movement of the tubular organ L occurs, it is possible to prevent the laser light irradiation position from shifting in the extension direction of the tubular organ L, and it is possible to reliably irradiate the laser light to the required location within the tubular organ L.

[0066] In addition, the optical fiber probe 32 preferably has an axial position display section 32 b that displays the axial position of the catheter 20 relative to the main body section 21 .

[0067] This makes it possible to accurately adjust the position in the extension direction within the tubular organ L, thereby improving the accuracy with which the laser light is irradiated onto the malignant tumor C.

[0068] In addition, the optical fiber probe 32 preferably has a rotational position display unit 32 c that displays the circumferential rotational position of the catheter 20 relative to the main body 21 .

[0069] This makes it possible to accurately adjust the circumferential position within the tubular organ L, thereby improving the accuracy with which the malignant tumor C is irradiated with laser light.

[0070] In the above embodiment, photodynamic therapy is shown as an example of application of the light diffusion device, but the application is not limited to this, and the light diffusion device can be used in other medical treatments such as photoimmunotherapy.

[0071] In the above embodiment, the balloon portion 22 has a shape in which, in an expanded state, both ends in the axial direction of the main body portion 21 extend along the radial direction of the main body portion 21, but this is not limited thereto. It is sufficient that, in an expanded state, at least the end of the balloon portion 22 on the base end side in the axial direction of the main body portion 21 extends along the radial direction of the main body portion 21.

[0072] In addition, in the above embodiment, an axial position display unit 32b is provided on each of the tip and base ends of the optical fiber probe 32, but this is not limited to this, and an axial position display unit may be provided on only one of the tip and base ends of the optical fiber probe.

[0073] REFERENCE SIGNS LIST 1 Light irradiation medical device 10 Endoscope system 11 Videoscope 11b Treatment tool passage 20 Catheter 21 Main body 22 Balloon 30 Light irradiator 32 Optical fiber probe 32a Light emission part L Hollow organ C Malignant tumor

Claims

1. A light irradiation medical device that irradiates light at a predetermined location on the inner wall of a hollow organ of a living body, comprising: a catheter that can be inserted into a treatment tool passage formed in a videoscope that constitutes an endoscopic system; and a light irradiator that has an optical fiber probe that can be inserted into the catheter, and causes light from a light source to enter the base end of the optical fiber probe and emit it from a light emitting unit provided on the tip end of the optical fiber probe, wherein the catheter has: a tubular main body that can be inserted into the hollow organ; and a balloon that is provided on the tip end of the main body and can be expanded and contracted in the radial direction of the main body, and whose outer surface can be brought into contact with at least a portion of the inner wall of the hollow organ of a living body by expanding, and wherein the light emitted from the light emitting unit passes through the balloon and is emitted to the outer surface side of the balloon.

2. A light irradiation medical device as described in claim 1, wherein when the balloon portion is expanded in the radial direction of the main body portion, the base end side end of the main body portion extends along the radial direction of the main body portion.

3. The light irradiation medical device according to claim 1, wherein the light emitting section emits light radially outward from the tip side of the optical fiber probe.

4. The light irradiation medical device according to claim 1, wherein an air layer is formed on the outer surface side of the light emitting portion of the optical fiber probe.

5. The light irradiation medical device according to claim 1, wherein the optical fiber probe is movable in the axial direction of the main body of the catheter.

6. The light irradiation medical device according to claim 5, wherein the optical fiber probe has an axial position display unit that displays the axial position of the catheter relative to the main body.

7. The light irradiation medical device according to claim 1, wherein the optical fiber probe is rotatable in the circumferential direction of the main body of the catheter.

8. The light irradiation medical device according to claim 7, wherein the optical fiber probe has a rotational position display unit that displays the circumferential rotational position of the catheter relative to the main body.

Images