CN117414109A

CN117414109A - Superfine OCT imaging catheter

Info

Publication number: CN117414109A
Application number: CN202311602579.4A
Authority: CN
Inventors: 朱锐; 曹一挥; 李强
Original assignee: SHENZHEN VIVOLIGHT MEDICAL DEVICE & TECHNOLOGY CO LTD
Current assignee: SHENZHEN VIVOLIGHT MEDICAL DEVICE & TECHNOLOGY CO LTD
Priority date: 2022-12-30
Filing date: 2023-11-27
Publication date: 2024-01-19
Also published as: CN115813349A

Abstract

The application belongs to the technical field of medical equipment and provides an ultrafine OCT imaging catheter which comprises a microtube and an OCT imaging assembly, wherein a central cavity is arranged in the microtube; after the guide wire passes through the central cavity of the microtube and guides the microtube to the first target position of the blood vessel, the guide wire is drawn out, the OCT imaging component enters the central cavity of the microtube and pushes the distal end of the optical fiber to the second target position of the blood vessel, and the guide wire and the OCT imaging component are separated into the central cavity of the microtube in sequence, so that the guide wire and the OCT imaging component can share the central cavity of the microtube, a space for the guide wire to pass through is not required to be reserved in the blood vessel, the space diameter of the OCT imaging catheter required by the use is greatly reduced, and the OCT imaging catheter can be suitable for small and complex intracranial blood vessels.

Description

Superfine OCT imaging catheter

The present application claims priority from chinese patent application No. 202211724355.6 entitled "ultra-fine OCT imaging catheter" filed on 12 months 30 of 2022, the entire contents of which are incorporated herein by reference.

Technical Field

The application belongs to the technical field of medical instruments, and particularly relates to an ultrafine OCT imaging catheter.

Background

In the medical field, catheters are commonly used to view a patient's intravascular condition, for example, a target site within a blood vessel is accessed by a catheter, and the target site is scanned to image the condition of the intravascular target site so that a medical practitioner can view the condition of the intravascular target site.

OCT (Optical Coherence Tomography ) is an emerging tomographic imaging technique, and because of its higher resolution, the acquired image is clearer, and the condition of a target site can be completely and clearly observed, and at present, OCT imaging catheters have been widely used in the field of vascular focus diagnosis.

The traditional OCT imaging catheter generally comprises an outer sleeve, a spring tube, an optical fiber and a guide wire, wherein a guide wire cavity is formed in the distal end of the outer sleeve, when the guide wire is used, the guide wire passes through the guide wire cavity in the outer sleeve and enters a blood vessel, after the distal end of the guide wire reaches the target part of the blood vessel, the outer sleeve carrying the spring tube and the optical fiber is guided to the target part of the blood vessel, and the guide wire only partially penetrates the guide wire cavity in the distal end of the outer sleeve, and other parts are parallel to the outer sleeve and are positioned in the blood vessel, so that a space capable of simultaneously accommodating the guide wire and the outer sleeve is reserved in the blood vessel, and the space diameter required by the OCT imaging catheter is larger when the OCT imaging catheter is used, so that the OCT imaging catheter is not suitable for small and complex intracranial blood vessels.

Disclosure of Invention

An object of the embodiment of the application is to provide an ultrafine OCT imaging catheter, so as to solve the technical problem that when the OCT imaging catheter in the prior art is used, an outer sleeve, a spring tube, an optical fiber and a guide wire are combined into a whole to enter a blood vessel, and the space diameter required by the OCT imaging catheter during use is greatly influenced.

In order to achieve the above purpose, the technical scheme adopted in the application is as follows: an ultra-fine OCT imaging catheter is provided, comprising:

the microtube is internally provided with a central cavity; a kind of electronic device with high-pressure air-conditioning system

The OCT imaging assembly comprises a spring tube and an optical fiber, wherein the spring tube is coated on the optical fiber; after a guidewire is passed through the central lumen of the microcatheter and the microcatheter is guided to a first target location of a vessel, the guidewire is withdrawn and the OCT imaging assembly is advanced into the central lumen of the microcatheter and the distal end of the optical fiber is advanced to a second target location of the vessel.

Optionally, the OCT imaging assembly further comprises an imaging lens disposed on a distal end of the optical fiber.

Optionally, the microtube is of an opaque structure, and the imaging lens is located outside the distal end of the microtube when the distal end of the optical fiber reaches the second target position.

Optionally, the micro tube has a light-transmitting portion, and when the distal end of the optical fiber reaches the second target position, the imaging lens is located in the micro tube and is disposed corresponding to the light-transmitting portion.

Optionally, the imaging lens is located outside the distal end of the spring tube; or, the imaging lens is positioned in the spring tube.

Optionally, the OCT imaging assembly further includes a buffer, the buffer being connected to the imaging lens when the imaging lens is located outside the distal end of the spring tube; when the imaging lens is positioned in the spring tube, the buffer is connected with the distal end of the imaging lens or the spring tube.

Optionally, the OCT imaging assembly further includes an outer tube, the spring tube and the optical fiber are disposed in the outer tube, and the imaging lens is disposed in the outer tube.

Optionally, the OCT imaging assembly further comprises a guide, a proximal end of the guide being connected to a distal end of the outer tube.

Optionally, a third development mark is provided on the proximal end of the guide and a fourth development mark is provided on the distal end of the guide.

Optionally, the OCT imaging assembly further includes a connection seat, a buffer tube, a protection cover, and a sheath, where a mouth is provided at a proximal end of the connection seat, the protection cover is plugged at the mouth, and the sheath wraps the connection seat.

The beneficial effect of superfine OCT imaging catheter that this application provided lies in: compared with the prior art, when the OCT imaging catheter is used, the guide wire passes through the central cavity of the microtube, after the distal end of the guide wire reaches the first target position of the blood vessel, the microtube is guided to the first target position of the blood vessel along the guide wire, then the guide wire is pulled out, the OCT imaging assembly enters the central cavity of the microtube, the distal end of the optical fiber is pushed to the second target position, scanning imaging is carried out, the guide wire and the OCT imaging assembly are separated into the central cavity of the microtube in sequence, the guide wire and the OCT imaging assembly can share the central cavity of the microtube, and therefore a space for the guide wire to pass through is not required to be reserved in the blood vessel, the space diameter of the OCT imaging catheter required when the OCT imaging catheter is used is greatly reduced, and the OCT imaging catheter can be suitable for small and complex intracranial blood vessels.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required for the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a superfine OCT imaging catheter according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram II of a superfine OCT imaging catheter according to an embodiment of the present disclosure;

FIG. 3 is a schematic diagram III of an ultra-fine OCT imaging assembly according to an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of a superfine OCT imaging assembly according to an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of a superfine OCT imaging assembly according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of a superfine OCT imaging assembly according to an embodiment of the present disclosure;

FIG. 7 is a schematic diagram of a superfine OCT imaging assembly according to an embodiment of the present disclosure;

FIG. 8 is a schematic diagram of an ultra-fine OCT imaging assembly according to an embodiment of the present disclosure;

FIG. 9 is a schematic diagram of an ultra-fine OCT imaging assembly according to an embodiment of the present disclosure;

FIG. 10 is an enlarged view at A of the OCT imaging assembly of FIG. 9;

fig. 11 is an enlarged view at B of the OCT imaging assembly shown in fig. 9.

The main reference numerals illustrate:

10. a microtube; 11. a light transmitting portion; 12. a first developing mark; 20. a spring tube; 21. a transparent window; 22. a second developing mark; 30. an optical fiber; 31. an inclined plane; 40. an imaging lens; 41. a reflective surface; 50. a light-transmitting sheath; 60. a buffer member; 70. an outer tube; 71. imaging the light transmission area; 80. a guide; 90. a third developing mark; 100. a fourth developing mark; 110. fifth developing marks; 120. a sixth developing mark; 130. a connecting seat; 140. a buffer tube; 150. a protective cover; 160. and (3) a sheath.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved by the present application more clear, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present application and simplify description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

The term "proximal" generally refers to the end of the corresponding assembly that is closer to the operator and "distal" refers to the end of the corresponding member that is farther from the operator.

Referring to fig. 1 to 7 together, an ultrafine OCT imaging catheter according to an embodiment of the present application will be described, wherein dashed lines in the respective figures are light beams, and directions indicated by arrows are propagation directions of the light beams.

Referring to fig. 1, an ultra-fine OCT imaging catheter includes a microcatheter 10 and an OCT imaging assembly. The OCT imaging component comprises a spring tube 20 and an optical fiber 30, wherein the spring tube 20 is coated on the optical fiber 30; after the guidewire is passed through the central lumen of the microcatheter 10 and the microcatheter 10 is guided to the first target site of the vessel, the guidewire is withdrawn, the OCT imaging assembly is advanced into the central lumen of the microcatheter 10 and the distal end of the optical fiber 30 is advanced to the second target site of the vessel.

Referring to fig. 4, the oct imaging assembly further includes an imaging lens 40, the imaging lens 40 being disposed on the distal end of the optical fiber 30.

When in use, a guide wire is firstly passed through the central cavity of the micro tube 10, after the distal end of the guide wire reaches a first target position of a blood vessel, the micro tube 10 is pushed to the first target position of the blood vessel along the guide wire, then the guide wire is pulled out, an OCT imaging component enters the central cavity of the micro tube 10 and is pushed towards the distal end direction of the micro tube 10, so that the distal end of the optical fiber 30 is pushed to a second target position of the blood vessel, then the micro tube 10 is flushed by using a flushing agent, and the spring tube 20 drives the optical fiber 30 and the imaging lens 40 to rotate and pull back, so that the imaging lens 40 performs complete scanning imaging on the second target position of the blood vessel.

Alternatively, the flushing agent may be a contrast medium, and the microtube 10 is flushed by the flushing agent, so as to facilitate scanning imaging by the imaging lens 40.

Compared with the prior art, when the superfine OCT imaging catheter provided by the application is used, the guide wire passes through the central cavity of the microtube 10, after the distal end of the guide wire reaches the first target position of a blood vessel, the microtube 10 is guided to the first target position of the blood vessel along the guide wire, then the guide wire is pulled out, the OCT imaging assembly enters the central cavity of the microtube 10, the distal end of the optical fiber is pushed to the second target position for scanning imaging, and the guide wire and the OCT imaging assembly are separated into the central cavity of the microtube 10 in sequence, so that the guide wire and the OCT imaging assembly can share the central cavity of the microtube 10, a space for the guide wire to pass through is not required to be reserved in the blood vessel, the space diameter required by the OCT imaging catheter in use is greatly reduced, and the OCT imaging catheter can be suitable for small and complex intracranial blood vessels.

In addition, microtubules have a variety of functions in the medical field. For example, the functions of a delivery guide wire, a suction plaque, a delivery stent and the like are indispensable in vascular interventional operations, so that the microtubule is delivered into a blood vessel by utilizing the microtubule to deliver an OCT imaging assembly, repeated withdrawal of the microtubule is not needed, and the complexity of operation is reduced.

Before use, the microtube 10 and the OCT imaging assembly are two separate and independent components, and when in use, after the distal end of the microtube 10 extends to the first target position of the blood vessel, the OCT imaging assembly reenters the microtube 10 and pushes the imaging lens 40 to the second target position of the blood vessel, where the second target position and the first target position may be the same position or two different positions, and the second target position is a target region of the intracranial blood vessel, that is, a lesion region.

Alternatively, the microtube 10 is made of polyethylene.

In one embodiment of the present application, the outer diameter of the microtube 10 is 0.15mm-0.25mm, and the diameter is smaller than the outer sleeve of the conventional OCT imaging catheter, and the trafficability and the flexibility are better, so that the outer sleeve of the conventional OCT imaging catheter is replaced by the microtube 10 to protect and convey the OCT imaging assembly, so that the overall diameter of the OCT imaging catheter is smaller, and the trafficability in the blood vessel is good.

In one embodiment of the present application, referring to fig. 1, the micro-tube 10 is in an opaque structure, and the imaging lens 40 is located outside the distal end of the micro-tube 10 when the distal end of the optical fiber 30 reaches the second target position. It can be understood that, since the micro tube 10 is in an opaque structure, the light reflected by the imaging lens 40 cannot pass through the micro tube 10 to act on the inner wall of the blood vessel, i.e. cannot be scanned for imaging, so that the imaging lens 40 is located outside the distal end of the micro tube 10 by extending the imaging lens 40 out of the distal end of the micro tube 10, so that the imaging lens 40 can reflect the light beam conducted by the optical fiber 30 onto the inner wall of the blood vessel, and can receive the light beam reflected by the inner wall of the blood vessel and return the light beam via the optical fiber 30 to realize scanning imaging. In this embodiment, the second target location is two different locations from the first target location, and the second target location is farther from the first target location, specifically the second target location is farther from the OCT imaging catheter proximal end than the first target location is from the OCT imaging catheter proximal end.

Further, with continued reference to fig. 1, a first visualization mark 12 is provided on the distal end of the microcatheter 10, the first visualization mark 12 being used to locate the position of the distal end of the microcatheter 10. A second developing mark 22 is provided on the distal end of the spring tube 20, and the second developing mark 22 is used to locate the position of the distal end of the spring tube 20 and thus the imaging lens 40. It will be appreciated that the external device recognizes the first and second visualization marks 12, 22 to obtain the distal end of the microcatheter 10 and the position of the imaging lens 40 for the medical staff to observe.

When the distal end of the optical fiber 30 reaches the second target position, the second developed mark 22 is spaced a predetermined distance from the first developed mark 12. It will be appreciated that the second target position is also a stop position for the OCT imaging assembly as it advances within the microcatheter 10, for example, in the advancement of the imaging lens 40 in the distal direction of the microcatheter 10, the second development marker 22 on the spring tube 20 gradually approaches the first development marker 12 on the distal end of the microcatheter 10, and when the second development marker 22 is at a predetermined distance from the first development marker 12, it indicates that the imaging lens 40 has reached the second target position, at which time the advancement of the imaging lens 40 is stopped.

Alternatively, the distance between the second developed mark 22 and the first developed mark 12 may be 0mm, i.e. the second developed mark 22 corresponds to the first developed mark 12, e.g. when the second developed mark 22 corresponds to the first developed mark 12, during pushing of the OCT imaging assembly towards the distal end of the microtube 10, it means that the distal end of the optical fiber 30 reaches the second target position, i.e. the imaging lens 40 reaches the second target position.

Optionally, the distance between the second developing mark 22 and the imaging lens 40 is greater than or equal to 3mm.

In another embodiment of the present application, referring to fig. 2, the distal end of the micro tube 10 has a light transmitting portion 11, and when the distal end of the optical fiber 30 reaches the second target position, the imaging lens 40 is located in the micro tube 10 and is disposed corresponding to the light transmitting portion 11. Since the micro tube 10 has the light transmitting portion 11 capable of transmitting light, when the imaging lens 40 corresponds to the light transmitting portion 11, the imaging lens 40 can scan and image the inner wall of the blood vessel through the light transmitting portion 11 in the micro tube 10.

It should be noted that, when the length of the light-transmitting portion 11 is greater than or equal to the length of the blood vessel target area and the spring tube 20 drives the imaging lens 40 to rotate and pull back in the micro tube 10 through the optical fiber 30, the imaging lens 40 can perform complete scanning imaging on the blood vessel target area through the light-transmitting portion 11.

Alternatively, since the distance by which the OCT imaging assembly is pulled back is 80mm or more, that is, the scanned blood vessel segment is 80mm or more, the length of the light transmitting portion 11 is 80mm or more.

Further, a first developing mark 12 is provided on the distal end of the micro tube 10, a second developing mark 22 is provided on the distal end of the spring tube 20, and when the distal end of the optical fiber 30 reaches the second target position, a predetermined distance is provided between the second developing mark 22 and the first developing mark 12, and the imaging lens 40 is located between the second developing mark 22 and the first developing mark 12.

Alternatively, the first developed indicia 12 may be spaced 3mm-5mm from the distal end face of the microcatheter 10 when the distal end of the optical fiber 30 reaches the second target location.

Alternatively, the second developing mark 22 is spaced from the first developing mark 12 by 80mm or more when the imaging lens 40 reaches the second target position.

In use, the OCT imaging assembly is movably disposed in the central cavity of the microcatheter 10, and is capable of being pulled back in the axial direction of the microcatheter 10, and is also capable of rotating about its own axis relative to the microcatheter 10. Specifically, since the inner wall of the blood vessel is circumferential and the target area has a certain length, the imaging lens 40 needs to be rotated and pulled back to obtain a complete image of the target area.

Further, the inner wall of the spring tube 20 is connected to the optical fiber 30. Optionally, the inner wall of the spring tube 20 is bonded to the optical fiber 30.

In this embodiment, the spring tube 20 is integrally formed, and the overall outer diameter of the spring tube 20 is kept uniform, that is, the spring tube 20 is a straight tube with a constant outer diameter.

Further, the length of the spring tube 20 is 1m to 1.6m, the outer diameter of the spring tube 20 is 0.45mm to 0.7mm, and the inner diameter of the spring tube 20 is 0.15mm to 0.3mm. Alternatively, the length of the spring tube 20 is 1.6m, the outer diameter of the spring tube 20 is 0.45mm, and the inner diameter of the spring tube 20 is 0.18mm.

The spring tube 20 is made of an opaque material. Alternatively, the spring tube 20 may be 304 stainless steel or 306 stainless steel.

In one embodiment of the present application, imaging lens 40 is located outside the distal end of spring tube 20. Specifically, the spring tube 20 wraps the optical fiber 30 from the proximal end of the optical fiber 30 to the distal end of the optical fiber 30, but does not exceed the imaging lens 40, i.e. the imaging lens 40 is located outside the distal end of the spring tube 20, so that the imaging lens 40 can scan and image the target area of the blood vessel better.

In another embodiment of the present application, to protect the imaging lens 40 to reduce the damage rate of the imaging lens 40, the imaging lens 40 is located inside the spring tube 20. Specifically, the distal end of the spring tube 20 extends to the distal end of the imaging lens 40 and exceeds the imaging lens 40, i.e. the spring tube 20 covers the imaging lens 40 to protect the imaging lens 40, so as to effectively avoid damage to the imaging lens 40.

Further, the distal end of the spring tube 20 exceeds the imaging lens 40 by 3mm-5mm, which is convenient for better protection of the imaging lens 40. Optionally, the distal end of the spring tube 20 extends 3mm, 4mm or 5mm beyond the imaging lens 40.

Further, referring to fig. 3, a transparent window 21 is provided on the distal end of the spring tube 20, and an imaging lens 40 is disposed corresponding to the transparent window 21. Specifically, since the spring tube 20 is made of a light-impermeable material, in order to enable the imaging lens 40 in the spring tube 20 to scan and image a target area of a blood vessel, a transparent window 21 is provided at the distal end of the spring tube 20, so that a light beam emitted through the imaging lens 40 can act on the inner wall of the blood vessel through the transparent window 21 to scan and image the blood vessel.

When forming the transparent window 21, a window is first opened on the spring tube 20, and the window is sealed with a light-transmitting material to form the transparent window 21. Further, the length of the transparent window 21 is 0.8mm-1mm, the width of the transparent window 21 is 0.3mm-0.4mm, and the distance between the transparent window 21 and the distal end of the spring tube 20 is 0.4mm-0.5mm. Alternatively, the transparent window 21 has a length of 1mm, the transparent window 21 has a width of 0.3mm, and the transparent window 21 is spaced from the distal end face of the spring tube 20 by 0.5mm.

In one embodiment of the present application, referring to fig. 4, a bevel 31 is disposed on a distal end of the optical fiber 30, a reflective surface 41 is disposed on the imaging lens 40, the reflective surface 41 is attached to the bevel 31, and the reflective surface 41 is used for performing total reflection on the light beam. Illustratively, the light beam is a laser beam, the OCT imaging catheter enters a target area of an intracranial blood vessel, that is, a lesion area, the laser beam emitted by the laser is transmitted through the optical fiber 30, the light beam in the optical fiber 30 is reflected by the reflecting surface 41 of the imaging lens 40 and then exits onto the inner wall of the blood vessel, the light beam reflected by the inner wall of the blood vessel is emitted to the imaging lens 40, and is totally reflected by the reflecting surface 41 of the imaging lens 40 and then returned through the optical fiber 30, thereby realizing scanning imaging.

It should be noted that, when the imaging lens 40 is located in the spring tube 20 and the transparent window 21 is provided on the distal end of the spring tube 20, the light reflecting surface 41 of the imaging lens 40 faces the transparent window 21.

Optionally, a chamfer 31 on the distal end of the optical fiber 30 is ground.

Alternatively, the imaging lens 40 may be made of polyethylene terephthalate (Polyethylene terephthalate, abbreviated as PET) to better fully reflect the light beam. Of course, the reflecting mirror may be a prism or a lens having a light reflecting function.

In some embodiments of the present application, referring to fig. 5, the oct imaging assembly further includes a light-transmitting sheath 50, where the light-transmitting sheath 50 is sleeved on the distal ends of the imaging lens 40 and the optical fiber 30, so as to protect the distal ends of the imaging lens 40 and the optical fiber 30, and further prevent the optical fiber 30 and the imaging lens 40 from being damaged.

Further, the inner wall of the light-transmitting sheath 50 is bonded to the imaging lens 40 and the distal end of the optical fiber 30.

Optionally, the light-transmitting sheath 50 is made of transparent glue or other light-transmitting material.

In other embodiments of the present application, referring to fig. 6, the oct imaging assembly further includes a buffer 60, where the buffer 60 is connected to the imaging lens 40 when the imaging lens 40 is located outside the distal end of the spring tube 20; when the imaging lens 40 is positioned within the spring tube 20, the bumper 60 is attached to the distal end of the imaging lens 40 or spring tube 20, as shown in FIG. 7.

After the OCT imaging catheter enters the intracranial blood vessel, due to the complex bending of the blood vessel, the spring tube 20 can make the imaging lens 40 collide with the micro tube 10 during turning, or the spring tube 20 can make the imaging lens 40 collide with the inner wall of the blood vessel during forward transition extension, so that the distal ends of the imaging lens 40 and the optical fiber 30 can be better protected by arranging the buffer member 60 at the front end of the imaging lens 40, which is beneficial to further preventing the distal ends of the imaging lens 40 and the optical fiber 30 from being damaged.

Further, the length of the buffer 60 is about 3mm.

Alternatively, the buffer 60 may be a spring or made of other materials with buffer function. When the bumper 60 is connected to the distal end of the spring tube 20, the bumper 60 can also be part of the spring tube 20 by extending the spring tube 20 forward to form the bumper 60 with a bumper function.

In one embodiment of the present application, referring to fig. 8, the oct imaging assembly further includes an outer tube 70, the spring tube 20 and the optical fiber 30 are disposed through the outer tube 70, and the imaging lens 40 is disposed in the outer tube 70, as shown in fig. 10.

Specifically, the distal end of the outer tube 70 is of a closed structure, so that when the OCT imaging assembly enters the central cavity of the microtube 10 or the blood vessel, blood in the blood vessel cannot enter the outer tube 70, and thus the spring tube 20, the optical fiber 30 and the imaging lens 40 are isolated from blood in the blood vessel by the outer tube 70, so that the spring tube 20, the optical fiber 30 and the imaging lens 40 are protected, and the blood is effectively prevented from interfering with the scanning imaging effect of the OCT imaging assembly on the target area of the blood vessel.

Optionally, the outer tube 70 has an imaging transparent region 71, and the imaging lens 40 is located in the imaging transparent region 71, so that the imaging lens 40 can scan the inner wall of the blood vessel through the imaging transparent region 71 in the outer tube 70.

It should be noted that, when the length L1 of the imaging transparent region 71 is greater than or equal to the length of the blood vessel target region, and the spring tube 20 drives the imaging lens 40 to rotate and pull back in the outer tube 70 through the optical fiber 30, the imaging lens 40 can perform complete scanning imaging on the blood vessel target region through the imaging transparent region 71.

Further, L1 is 95mm-105mm, alternatively L1 may be 95mm, 100mm or 101mm, etc.

In one embodiment of the present application, the OCT imaging assembly further includes a guide 80, the proximal end of the guide 80 being connected to the distal end of the outer tube 70. The guide 80 is used to guide the shuttle of the outer tube 70 to the microcatheter 10 for rapid and accurate guidance of the imaging lens 40 to the vascular target area.

The length L2 of the guide 80 is 12mm-18mm, alternatively L2 may be 12mm, 15mm, 18mm, etc.

The effective length L3 of the OCT imaging assembly is the sum of the length of the outer tube 70 and the length of the guide 80, L3 is 1800mm-1900mm, alternatively L3 can be 1800mm, 1850mm, 1900mm, etc.

In one embodiment of the present application, the proximal end of the guide 80 is provided with a third developing mark 90, the distal end of the guide 80 is provided with a fourth developing mark 100, the third developing mark 90 is used for positioning the proximal end of the guide 80, and the fourth developing mark 100 is used for positioning the distal end of the guide 80, so that when the guide 80 shuttles in the microtube 10 or the blood vessel, external equipment can acquire the position of the guide 80 by identifying the third developing mark 90 and the fourth developing mark 100, and the medical staff can observe the position conveniently.

The spring tube 20 is further provided with a fifth developing mark 110, and the fifth developing mark 110 is used for positioning the pull-back position of the spring tube 20. Further, the distance L4 between the fifth developing mark 110 and the second developing mark 22 is 37mm to 63mm, and optionally, the distance L4 between the fifth developing mark 110 and the second developing mark 22 is 40mm or 60mm, etc.

Referring to fig. 11, a sixth visualization mark 120 is provided on the outer tube 70, the sixth visualization mark 120 being used to locate the entry site of the OCT imaging catheter into the blood vessel.

Further, referring to fig. 9, in the region from the position of the sixth developing mark 120 to the distal end of the guide 80, the outer tube 70 and the outer surface of the guide 80 are coated with a hydrophilic coating, and the length L5 of the hydrophilic coating is 1450mm to 1550mm, alternatively, L5 may be 1450mm, 1500mm, 1550mm, or the like.

Referring to fig. 10, the distance L6 from the imaging lens 40 to the distal end of the guide 80 is 17mm-23mm, alternatively L6 may be 17mm, 20mm, 23mm, or the like.

In one embodiment of the present application, referring to fig. 9, the oct imaging assembly further includes a connecting seat 130, a buffer tube 140, a protecting cover 150, and a sheath 160, wherein a distal end of the connecting seat 130 is connected to a proximal end of the outer tube 70 through the buffer tube 140, a mouth is disposed at a proximal end of the connecting seat 130, the protecting cover 150 is plugged at the mouth, and the sheath 160 is wrapped around the connecting seat 130. The OCT imaging component is connected with the catheter connecting device, and the catheter connecting device drives the OCT imaging component to rotate and pull back, so that intracranial blood vessel imaging is facilitated.

Optionally, the buffer tube 140 is made of a high polymer material, such as Polyolefin (PO), and the like, and the buffer tube 140 is approximately cone-shaped and hollow, so that the buffer tube 140 can effectively release the stress at the proximal end of the outer tube 70 and effectively prevent the outer tube 70 from bending.

The foregoing description of the preferred embodiments of the present application is not intended to be limiting, but is intended to cover any and all modifications, equivalents, and alternatives falling within the spirit and principles of the present application.

Claims

1. An ultra-fine OCT imaging catheter, comprising:

2. The ultra-fine OCT imaging catheter of claim 1, wherein: the OCT imaging assembly further includes an imaging lens disposed on a distal end of the optical fiber.

3. The ultra-fine OCT imaging catheter of claim 2, wherein: the microtube is of an opaque structure, and the imaging lens is located outside the distal end of the microtube when the distal end of the optical fiber reaches a second target position.

4. The ultra-fine OCT imaging catheter of claim 2, wherein: the microtube is provided with a light transmission part, and when the distal end of the optical fiber reaches a second target position, the imaging lens is positioned in the microtube and is arranged corresponding to the light transmission part.

5. The ultra-fine OCT imaging catheter of claim 2, wherein: the imaging lens is positioned outside the distal end of the spring tube; or, the imaging lens is positioned in the spring tube.

6. The ultra-fine OCT imaging catheter of claim 5, wherein: the OCT imaging assembly further includes a buffer, the buffer being connected to the imaging lens when the imaging lens is positioned outside the distal end of the spring tube; when the imaging lens is positioned in the spring tube, the buffer is connected with the distal end of the imaging lens or the spring tube.

7. The ultra-fine OCT imaging catheter of claim 2, wherein: the OCT imaging component further comprises an outer tube, the spring tube and the optical fiber penetrate through the outer tube, and the imaging lens is arranged in the outer tube.

8. The ultra-fine OCT imaging catheter of claim 7, wherein: the OCT imaging assembly further includes a guide having a proximal end coupled to a distal end of the outer tube.

9. The ultra-fine OCT imaging catheter of claim 8, wherein: a third development mark is provided on the proximal end of the guide and a fourth development mark is provided on the distal end of the guide.

10. The ultra-fine OCT imaging catheter of claim 1, wherein: the OCT imaging component further comprises a connecting seat, a buffer tube, a protective cover and a sheath, wherein the proximal end of the connecting seat is provided with a mouth, the protective cover is plugged in the mouth, and the sheath is wrapped outside the connecting seat.