Intracranial vascular stenosis treatment device

Abstract

The utility model discloses an intracranial vascular stenosis treatment device which is provided with a far end and a near end which are opposite to each other, and comprises an inner tube, an outer tube and an inner tube, the balloon body comprises a balloon wall, the balloon wall forms a balloon cavity on the periphery of the inner tube, and the balloon wall is provided with an optical distribution structure; the outer tube is arranged outside the inner tube in a sleeving mode, the far end of the outer tube is communicated with the balloon cavity, and a radial gap between the outer tube and the inner tube serves as a fluid channel communicated with the balloon cavity; the light-emitting component is located in the balloon cavity and provides first light rays, the first light rays are diverged towards the periphery of the balloon body through the optical distribution structure, and the first light rays are 400 nm to 1200 nm. According to the intracranial vascular stenosis treatment device, the first light rays which are evenly distributed are used for repairing the inner wall of the blood vessel in the balloon dilatation process, full dilatation is achieved as much as possible on the premise that safety is guaranteed, and meanwhile the first light rays play a role in restraining stenosis.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and particularly to an intracranial vascular stenosis treatment device. Background Art

[0002] For intravascular stenosis lesions, balloon dilation or balloon pretreatment followed by stent implantation is used for treatment. This surgical treatment method has achieved great success in the coronary artery field. However, intracranial blood vessels are very fragile, and balloon dilation has problems such as blood vessel tearing and rebound. Therefore, clinical treatment often uses sub-satisfactory dilation to treat blood vessels while ensuring safety. The treatment effect of this dilation is relatively poor, and the immediate rebound of blood vessels is obvious. Further stent implantation often leads to problems such as poor stent apposition. At the same time, endothelial injury caused by balloon dilation is also prone to restenosis problems. Currently, it is found in clinical practice that interventional treatment of symptomatic stenosis is likely to cause serious adverse events and endanger the health of patients. Therefore, there is an urgent need in clinical practice for a new balloon device that still has good dilation effect and inhibition of late restenosis while ensuring safety. Summary of the Utility Model

[0003] Based on this, the present application provides an intracranial vascular stenosis treatment device that uses uniformly distributed first light rays to repair the inner wall of blood vessels during balloon dilation, expands as fully as possible on the premise of ensuring safety, and at the same time the first light rays also play a role in inhibiting stenosis.

[0004] An intracranial vascular stenosis treatment device has opposite distal and proximal ends. The intracranial vascular stenosis treatment device includes:

[0005] An inner tube, the lumen of which provides a guide wire passage;

[0006] A balloon body, including a balloon wall, the balloon wall enclosing a balloon cavity around the outer periphery of the inner tube, and the balloon wall being provided with an optical distribution structure;

[0007] An outer tube, sleeved outside the inner tube, the distal end of the outer tube communicating with the balloon cavity, and the radial gap between the outer tube and the inner tube serving as a fluid passage communicating with the balloon cavity;

[0008] A light-emitting component, located in the balloon cavity, providing first light rays, the first light rays diverging towards the outer periphery of the balloon body via the optical distribution structure, and the wavelength range of the first light rays being 400nm - 1200nm.

[0009] The following also provides several optional ways, but they are not additional limitations to the above overall solution, but only further supplements or optimizations. On the premise of no technical or logical contradiction, each optional way can be combined with the above overall solution alone, or multiple optional ways can be combined with each other.

[0010] Optionally, the optical distribution structure is a stripe structure distributed on the outer peripheral surface of the balloon wall.

[0011] Optionally, the stripe structure is an annular groove extending circumferentially along the balloon body. There are multiple annular grooves, and between two adjacent annular grooves are annular ribs protruding radially outward. The annular grooves are arranged in sequence along the axial direction of the balloon body.

[0012] Optionally, the distance between two adjacent annular grooves is 20 μm to 1 mm.

[0013] Optionally, the depth of each annular groove is 20 μm to 300 μm.

[0014] Optionally, in the cross-section of the annular groove, the inner wall of the annular groove is a smooth curve.

[0015] Optionally, in the longitudinal section of the balloon body, the balloon wall extends axially in a wavy shape.

[0016] Optionally, the stripe structure is a straight groove extending axially along the balloon body. There are multiple straight grooves, and between two adjacent straight grooves are rib strips protruding radially outward. The straight grooves are arranged in sequence along the circumferential direction of the balloon body.

[0017] Optionally, the optical distribution structure is a rough layer distributed on the outer peripheral surface of the balloon wall.

[0018] Optionally, the surface roughness Ra of the rough layer is 1.6 to 6.3.

[0019] The intracranial vascular stenosis treatment device provided by the present application uses uniformly distributed first light rays to repair the inner wall of the blood vessel during balloon dilation, fully dilates as much as possible on the premise of ensuring safety, and at the same time the first light rays also play a role in inhibiting stenosis. Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the first embodiment of the intracranial vascular stenosis treatment device of the present application;

[0021] Figure 2 It is a schematic diagram of the second embodiment of the intracranial vascular stenosis treatment device of the present application;

[0022] Figure 3a It is a schematic diagram of the balloon body part of the intracranial vascular stenosis treatment device of the present application;

[0023] Figure 3b is Figure 3a a partial enlarged view of A in

[0024] Figure 4aSchematic diagram of the balloon part of the intracranial vascular stenosis treatment device of the present application;

[0025] Figure 4b is Figure 4a Cross-sectional view in the B-B direction in;

[0026] Figure 4c Cross-sectional schematic diagram (ignoring thickness) of the balloon part of the intracranial vascular stenosis treatment device of the present application;

[0027] Figure 4d Cross-sectional schematic diagram of the balloon part of the intracranial vascular stenosis treatment device of the present application;

[0028] Figure 4e is Figure 4d Enlarged view of part C in;

[0029] Figure 5 Cross-sectional schematic diagram of the balloon part of the intracranial vascular stenosis treatment device of the present application;

[0030] Figure 6 Structural block diagram of the treatment system for intracranial vascular stenosis of the present application;

[0031] Figure 7 Flowchart of the method for treating intracranial vascular stenosis based on the intracranial vascular stenosis treatment device of the present application;

[0032] Figure 8a Microscopic image of the blood vessel wall after HE staining of the blank group when the balloon pressure is 2 atm;

[0033] Figure 8b Microscopic image of the blood vessel wall after HE staining of the injury group when the balloon pressure is 2 atm;

[0034] Figure 8c Microscopic image of the blood vessel wall after HE staining of the repair group when the balloon pressure is 2 atm;

[0035] Figure 9a Microscopic image of the blood vessel wall after HE staining of the blank group when the balloon pressure is 6 atm;

[0036] Figure 9b Microscopic image of the blood vessel wall after HE staining of the injury group when the balloon pressure is 6 atm;

[0037] Figure 9c Microscopic image of the blood vessel wall after HE staining of the repair group when the balloon pressure is 6 atm;

[0038] Figure 10a Microscopic image of the blood vessel wall after HE staining of the blank group when the balloon pressure is 10 atm;

[0039] Figure 10b When the pressure of the balloon body is 10 atm, it is a microscopic image of the blood vessel wall of the injury group after HE staining;

[0040] Figure 10c When the pressure of the balloon body is 10 atm, it is a microscopic image of the blood vessel wall of the repair group after HE staining.

[0041] In the figure: 100, intracranial vascular stenosis treatment device; 110, inner tube; 111, imaging ring; 120, outer tube; 130, balloon body; 131, balloon wall; 132, optical distribution structure; 133, balloon cavity; 140, light-emitting component; 150, fluid channel; 160, guide wire channel; 161, guide wire threading port; 171, annular groove; 172, annular rib; 181, straight groove; 182, rib; 190, light-emitting component channel; 191, handle. Detailed implementation manners

[0042] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.

[0043] For better describing and illustrating the embodiments of the present application, one or more accompanying drawings can be referred to, but the additional details or examples used to describe the accompanying drawings should not be considered as limiting the scope of any one of the invention creations of the present application, the currently described embodiments or the preferred modes.

[0044] It should be noted that when a component is referred to as being "connected" to another component, it can be directly connected to the other component or there may also be an intermediate component. When a component is considered to be "disposed on" another component, it can be directly disposed on the other component or there may be an intermediate component at the same time.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the specification of this application herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0046] See Figure 1 、 Figure 2 As shown in

[0047] Inner tube 110, the lumen of the inner tube 110 provides a guide wire channel 160;

[0048] Balloon body 130, including a balloon wall 131, the balloon wall 131 encloses a balloon cavity 133 around the outer periphery of the inner tube 110, and the balloon wall 131 is provided with an optical distribution structure 132;

[0049] Outer tube 120, sleeved outside the inner tube 110, the distal end of the outer tube 120 communicates with the balloon cavity 133, and the radial gap between the outer tube 120 and the inner tube 110 serves as a fluid channel 150 communicating with the balloon cavity 133;

[0050] Light emitting component 140, located in the balloon cavity 133, provides a first light ray, the first light ray diverges towards the outer periphery of the balloon body 130 via the optical distribution structure 132, and the wavelength range of the first light ray is 400nm - 1200nm.

[0051] During the expansion process of the balloon body 130, it may cause tearing of the blood vessel inner wall and vasospasm, making the expansion difficult. In this application, the light emitting component 140 emits a first light ray with a wavelength range of 400 - 1200nm. The light within this wavelength range has the effect of repairing the vascular endothelium and soothing the smooth muscle, avoiding vasospasm caused by tearing of the blood vessel, reducing the stress exerted by the blood vessel on the balloon body 130, that is, reducing the rebound of the blood vessel, making the expansion process of the balloon body 130 easier, and at the same time causing less damage to the blood vessel wall. Under the condition of ensuring safety, more sufficient expansion can be carried out. At the same time, since the vascular endothelium is repaired, it can also inhibit the occurrence of late vascular restenosis.

[0052] See Figure 1 As shown, in one embodiment, the intracranial vascular stenosis treatment device 100 further includes: a handle portion 191, the proximal ends of the inner tube 110 and the outer tube 120 are both connected to the handle portion 191, and the handle portion 191 has interfaces respectively communicating with the guide wire channel 160 and the fluid channel 150.

[0053] See Figure 2 As shown, in another embodiment, the balloon dilation catheter further includes:

[0054] Handle portion 191, the proximal end of the outer tube 120 is connected to the handle portion 191, and the handle portion 191 has an interface communicating with the fluid channel 150;

[0055] The proximal end of the inner tube 110 is hermetically docked to the tube wall of the outer tube 120, and a guide wire through - hole 161 communicating with the guide wire channel 160 is provided on the tube wall of the outer tube 120 at the hermetic docking portion.

[0056] A wire threading port 161 is formed in the tube wall of the outer tube 120. The wire threading port 161 is in communication with the inner tube 110. A guide wire enters the lumen of the inner tube 110 through the wire threading port 161. The proximal end of the inner tube 110 is sealingly connected to the tube wall of the outer tube 120 at the position of the wire threading port 161, so as to ensure that the radial gap between the inner tube 110 and the outer tube 120 can still serve as a fluid passage 150, but will not communicate with the lumen of the inner tube 110.

[0057] The wire threading port 161 is arranged on the tube wall of the outer tube 120, that is, the threading path of the guide wire in the inner tube 110 is shortened, the length of the guide wire can be reduced, and the frictional force between the guide wire and the lumen of the inner tube 110 can be reduced.

[0058] In this application, for the distal end and the proximal end, refer to Figure 1 、 Figure 2 for the markings. The distal end is the end far from the operator, and the proximal end is the end close to the operator. The distal end and the proximal end are relative concepts, and any component has a distal end and a proximal end.

[0059] Refer to Figure 1 、 Figure 2 As shown, a radiopaque ring 111 is fixedly sleeved on the outer periphery of the inner tube 110 and is located inside the balloon body 130. The radiopaque ring 111 is made of a metal material and can indicate the position of the balloon body 130 under the action of a contrast agent.

[0060] Due to the deviation in the size of the optical fiber itself, the light emitted from the optical fiber is difficult to ensure uniformity, and it is also difficult to achieve uniform irradiation after the light passes through the balloon body 130. In this application, an optical distribution structure 132 is provided on the balloon wall 131 of the balloon body 130. After passing through the optical distribution structure 132, the first light diverges towards the outer periphery of the balloon body 130 through multiple reflections, refractions and scatterings, so that the light acting on the inner wall of the blood vessel is more uniform (the more uniform light includes the uniformity of the irradiation area and the uniformity of the irradiation intensity).

[0061] The optical distribution structure 132 is a stripe structure distributed on the outer peripheral surface of the balloon wall 131. The optical distribution structure 132 can adopt various implementation manners. For example, Figures 3a - 3b in the shown implementation manner, the stripe structure is an annular groove 171 extending along the circumferential direction of the balloon body 130. There are multiple annular grooves 171. An annular rib 172 protruding radially outward is arranged between two adjacent annular grooves 171. The annular grooves 171 are arranged in sequence along the axial direction of the balloon body 130.

[0062] Refer to Figure 3b As shown, the distance between two adjacent annular grooves 171 (i.e., Figure 3b L1 in Figure 3bThe H1) in it is 20 μm to 300 μm. On the cross-section of the annular groove 171, the inner wall of the annular groove 171 is a smooth curve. For example, shapes such as arc and parabola. Refer to Figure 3b As shown, on the longitudinal section of the balloon body 130, the balloon wall 131 extends axially along the balloon body 130 in a wavy shape.

[0063] The annular grooves 171 are arranged at equal intervals along the axial direction of the balloon body 130. After the first light passes through each annular groove 171, reflection, refraction, scattering, etc. occur, and after improving the uniformity of the light, it acts on the inner wall of the blood vessel.

[0064] The optical distribution structure 132 can also adopt the implementation manner such as Figure 4a 、 Figure 4b As shown, the stripe structure is a straight groove 181 extending along the axial direction of the balloon body 130. There are multiple straight grooves 181. Between adjacent two straight grooves 181 are ribs 182 protruding radially outward. The straight grooves 181 are arranged in sequence along the circumferential direction of the balloon body 130. The distance between adjacent two straight grooves 181 (refer to Figure 4b 's L2) is 20 μm to 1 mm. The distance between adjacent two straight grooves 181 is defined as the distance between the center points of the bottoms of the two straight grooves 181.

[0065] Refer to Figure 4b As shown, the depth of each straight groove 181 (refer to Figure 4b 's H2) is 20 μm to 300 μm. On the cross-section of the straight groove 181, the inner wall of the straight groove 181 is a smooth curve. For example, shapes such as arc and parabola. The number of straight grooves 181 is 3 - 40.

[0066] Refer to Figure 4d 、 Figure 4e As shown, the balloon body is prepared by a blow molding process. The hollow tube blank is axially stretched, and then gas is filled into the tube blank to apply a large pressure, so that the tube blank expands radially and is formed in a mold. By extending the pressure holding time of the blow molding process, the tube blank shows a state of uneven wall thickness in the mold, where the wall thickness d2 of the rib part is greater than the wall thickness d1 of the bottom of the straight groove. Due to the uneven surface thickness of the balloon body and the superposition of the distribution of the straight grooves and ribs, the light of the optical fiber is redistributed through refraction, reflection, and scattering effects, making the light applied to the blood vessel wall more uniform.

[0067] In this application, the pressure holding time of the blow molding process is 0.5 min to 5 min. The pressure holding time is closely related to the size of the balloon body. The larger the size of the balloon body, the longer the pressure holding time. The pressure holding time is 1.2 - 1.5 times that of the balloon body made by the conventional blow molding process.

[0068] Refer to Figure 4b As shown, the span of the opening of the straight groove 181 along the circumferential direction of the balloon body 130 (refer toFigure 4b The L3) is 20 μm to 1 mm. On the cross-section of the balloon body 130, the balloon wall 131 is wavy and extends circumferentially. Refer to Figure 4c As shown, on the cross-section of the balloon body 130, the part where the rib 182 is connected to the straight groove 181 has a smooth transition.

[0069] The first light ray diverges peripherally as the second light ray after passing through the optical distribution structure 132, and the energy distribution of the second light ray on the surface of the balloon body 130 is more uniform relative to the first light ray. For example, in the prior art, without the optical distribution structure 132, at a wavelength of 635 nm and a power of 30 mW / cm 2 ², the surface temperature error of the balloon body 130 is 0.5 to 1 °C. After adopting the optical distribution structure 132 provided in the present application, the surface temperature error of the balloon body 130 does not exceed 0.2 °C.

[0070] The optical distribution structure 132 can also adopt the structure as Figure 5 shown. The optical distribution structure 132 is a rough layer distributed on the outer peripheral surface of the balloon wall 131, and the surface roughness Ra of the rough layer is 1.6 to 6.3. The rough layer can be processed in various ways. For example, the rough layer is formed by a coating method, or the balloon wall 131 is formed by laser etching, surface polishing, or chemical treatment on the outer wall surface.

[0071] The rough layer can also be formed by die molding. Specifically, the balloon body 130 is blow molded, and the part in the mold cavity of the blow molding die that contacts the outer wall of the balloon body 130 has corresponding roughness.

[0072] The wavelength range of the first light ray is 600 to 850 nm. The power of the first light ray is 3 mW / cm 2 ² to 100 mW / cm 2 ². The irradiation time of the first light ray is 30 s to 600 s.

[0073] Light with a wavelength in the range of 600 to 850 nm roughly corresponds to the red light band and the near-infrared band in visible light, and light in this wavelength range has a better effect of repairing vascular endothelium and soothing smooth muscle. If the power of the first light ray is too low, the repair effect will be unsatisfactory, and if the power is too high, it will cause excessive heat and lead to vascular burns.

[0074] The wavelength of the first light ray has an impact on the treatment effect, and the preferably adopted wavelengths include 635 nm, 650 nm, or 808 nm.

[0075] Refer to Figure 4a As shown, at least a part of the light-emitting component 140 in the balloon cavity 133 is a light-emitting section to provide the first light ray. The length of the light-emitting section (i.e., Figure 4aThe length of L4) therein is 1 mm to 50 mm. Preferably, the length of the light-emitting section is 10 to 40 mm.

[0076] See Figure 3a 、 Figure 4a As shown, the light-emitting component is located in the radial gap between the inner tube 110 and the outer tube 120. The light-emitting component is fixed to the outer periphery of the inner tube 110. The light-emitting component is fixed as close as possible to the inner tube 110, so that the light-emitting component is as close as possible to the axis of the balloon body 130, which is more conducive to the light emitted by the light-emitting component passing through the balloon body 130 and being evenly emitted to the outer periphery.

[0077] See Figure 1 、 Figure 2 As shown, the handle 191 is further provided with a light-emitting component channel 190 for passing through the light-emitting component. The light-emitting component enters the radial gap between the inner tube 110 and the outer tube 120 through the light-emitting component channel 190 and extends into the balloon cavity 133.

[0078] The light-emitting component can be an optical fiber or a Micro LED. When an optical fiber is used, a laser generator needs to be configured. When a Micro LED is used, a power source needs to be configured. The power source can be a miniaturized component such as a button battery, making the overall balloon catheter device lightweight.

[0079] See Figure 6 As shown, the present application also provides a treatment system for intracranial vascular stenosis, including:

[0080] The intracranial vascular stenosis treatment device provided by the present application;

[0081] A light source, connected to the light-emitting component through an optical path;

[0082] A perfusion device, communicated with the fluid channel through a fluid pipeline.

[0083] The light source is connected to the light-emitting component to drive the light-emitting component to emit light, and the perfusion device provides perfusion and / or extraction of fluid into the balloon cavity.

[0084] See Figure 7 As shown, the present application also provides a method for treating intracranial vascular stenosis based on the intracranial vascular stenosis treatment device, including:

[0085] Interventionally delivering the intracranial vascular stenosis treatment device to a predetermined site, wherein the distal end of the intracranial vascular stenosis treatment device is provided with a balloon body;

[0086] Inflating the balloon body with fluid and dilating the intracranial vascular stenosis site;

[0087] Providing a first light ray in the balloon body. After the first light ray is optically distributed through the wall of the balloon body, a second light ray acts on the intracranial blood vessel dilated by the balloon body.

[0088] When the balloon is in an inflated state, the stenotic part of the intracranial blood vessel is dilated. While the balloon is being dilated, the first light emitted by the light-emitting component is optically distributed through the wall of the balloon and then acts on the intracranial blood vessel dilated by the balloon as a more uniform second light.

[0089] For the vascular wall samples, HE (hematoxylin-eosin) staining sections were prepared as follows:

[0090] (1) Gradient immersion in water: Immerse successively in 100% ethanol, 95% ethanol, 85% ethanol, and 75% ethanol for 5 minutes each, and rinse with tap water for 1 minute.

[0091] (2) Hematoxylin staining for 3 minutes, and rinse with tap water for 1 minute.

[0092] (3) Differentiating solution (1 mL of concentrated hydrochloric acid dissolved in 40 mL of 70% ethanol) for 20 seconds, and rinse with tap water for 1 minute.

[0093] (4) Eosin staining for 10 seconds, and rinse with tap water for 1 minute.

[0094] (5) Gradient dehydration: Immerse successively in 75% ethanol, 85% ethanol, and 95% ethanol for 3 minutes each.

[0095] (6) Section transparency: Immerse in xylene for 5 minutes, and repeat 3 times.

[0096] (7) Sealing the section: Seal the stained glass slide with neutral balsam and observe under a microscope.

[0097] Observe the tissue layers, fiber distribution, or cell morphology of the tissue sections of each vascular wall sample under a microscope. The vascular wall is divided into the intima layer, the media layer, and the adventitia layer. The intima layer is the innermost layer of the vessel wall and is the thinnest of the three layers, mainly composed of endothelial cells; the media layer is mainly the smooth muscle layer, with a large number of smooth muscle elastic fibers to maintain the vasomotor function; the adventitia layer is mainly composed of fibroblasts and loose connective tissue, containing spiral or longitudinally distributed elastic fibers and collagen fibers. When the blood vessel is damaged, fibroblasts have the ability to repair the adventitia.

[0098] Figure 8a 、 Figure 9a 、 Figure 10a are the microscope photos of the blank group where the balloon has not been dilated. Figure 8b 、 Figure 9b 、 Figure 10b are the microscope photos of the damaged group obtained after the balloon is dilated under different dilation pressures. Figure 8c 、 Figure 9c 、 Figure 10cMicroscopic photographs of the repair group that underwent dilation at different dilation pressures while being irradiated with light having a wavelength range of 635 nm for repair.

[0099] Comparison Figure 9b and Figure 10b , due to the relatively large dilation pressure of the balloon body, the blood vessel wall was significantly damaged. Moreover, the greater the dilation pressure of the balloon body, the more the fibrous tissue of the blood vessel wall was torn, obvious cracks and holes could be seen, and the fibers of the entire intima layer were loose.

[0100] Comparison Figure 9c and Figure 10c , when repair was performed by light irradiation, the tearing of the fibrous tissue of the blood vessel wall was significantly reduced, the fibrous tissue was uniform and dense, and the repair effect was ideal.

[0101] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the various technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.

[0102] The above-described embodiments merely represent several implementation manners of the present application. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A device for treating intracranial vascular stenosis, having a distal end and a proximal end opposite to each other, characterized in that: The intracranial vascular stenosis treatment device comprises: an inner tube, wherein the lumen of the inner tube provides a guide wire passage; The balloon body comprises a balloon wall, wherein the balloon wall forms a balloon cavity around the outer periphery of the inner tube, and the balloon wall has an optical distribution structure; An outer tube is sleeved on the outer part of the inner tube, the distal end of the outer tube is connected to the balloon cavity, and the radial gap between the outer tube and the inner tube serves as a fluid channel connected to the balloon cavity; The light emitting component is located in the balloon cavity and provides a first light. The first light is diverged toward the periphery of the balloon body via the optical distribution structure. The wavelength range of the first light is 400nm to 1200nm.

2. The intracranial vascular stenosis treatment device according to claim 1, characterized in that: The optical distribution structure is a stripe structure distributed on the outer peripheral surface of the capsule wall.

3. The intracranial vascular stenosis treatment device according to claim 2, characterized in that: The striped structure is an annular groove extending along the circumference of the balloon body. There are multiple annular grooves, and an annular rib protruding radially outward is between two adjacent annular grooves. The annular grooves are arranged in sequence along the axial direction of the balloon body.

4. The intracranial vascular stenosis treatment device according to claim 3, characterized in that: The distance between two adjacent annular grooves is 20 μm to 1 mm.

5. The intracranial vascular stenosis treatment device according to claim 3, characterized in that: The depth of each annular groove is 20 μm to 300 μm.

6. The intracranial vascular stenosis treatment device according to claim 3, characterized in that: In the cross section of the annular groove, the inner wall of the annular groove is a smooth curve.

7. The intracranial vascular stenosis treatment device according to claim 3, characterized in that: In the longitudinal section of the balloon body, the balloon wall is wavy and extends axially along the balloon body.

8. The intracranial vascular stenosis treatment device according to claim 3, characterized in that: The striped structure is a straight groove extending along the axial direction of the balloon body. There are multiple straight grooves, and between two adjacent straight grooves there are ribs protruding radially outward. The straight grooves are arranged in sequence along the circumference of the balloon body.

9. The intracranial vascular stenosis treatment device according to claim 1, characterized in that: The optical distribution structure is a rough surface layer distributed on the outer peripheral surface of the capsule wall.

10. The intracranial vascular stenosis treatment device according to claim 9, characterized in that: The surface roughness Ra of the matte layer is 1.6-6.3.

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