CN218899436U - OCT imaging catheter - Google Patents

Abstract

The application belongs to the technical field of medical equipment, provides an OCT imaging catheter, include: an outer tube, an optical fiber and a spring tube; the guide wire is connected with the distal end of the outer tube; the optical fiber is arranged in the outer tube in a penetrating mode, wherein the optical fiber comprises a proximal end body section and a distal end body section which are connected, and the spring tube is arranged in the outer tube in a penetrating mode and is coated on the proximal end body section. According to the method, the spring tube is coated on the proximal end body section of the optical fiber, the distal end body section of the optical fiber is not coated with the spring tube, so that the outer diameter of the part of the outer tube corresponding to the distal end body section can be reduced, the diameter size of the distal end of the OCT imaging catheter can be greatly reduced, the trafficability of the OCT imaging catheter when the OCT imaging catheter shuttles in a blood vessel is improved, the OCT imaging catheter can smoothly pass through tiny and complex intracranial blood vessels, and normal use of the OCT imaging catheter in the intracranial blood vessels is effectively ensured.

Description

OCT imaging catheter

Technical Field

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

Background

OCT (Optical Coherence Tomography ) imaging, which uses modern computer image processing, integrates advanced optical technology with ultrasensitive detectors, is an emerging tomographic technique. Because the resolution of OCT imaging technology can reach 10um, the resolution is higher, the acquired image is clearer, and the condition of the target part can be completely and clearly observed, the OCT imaging catheter becomes an important tool for medical staff to observe the condition of the target part in the blood vessel.

The current OCT imaging catheter has larger size, so that the OCT imaging catheter has poor trafficability when shuttled in small and complex intracranial blood vessels, and the OCT imaging catheter is difficult to normally use in the intracranial blood vessels.

Disclosure of Invention

An object of the embodiments of the present application is to provide an OCT imaging catheter, so as to solve the technical problem that the OCT imaging catheter has a large diameter in the prior art, so that the OCT imaging catheter has poor trafficability in a small and complex intracranial blood vessel.

In order to achieve the above purpose, the technical scheme adopted in the application is as follows: there is provided an OCT imaging catheter comprising: an outer tube, an optical fiber and a spring tube; the optical fiber is arranged in the outer tube in a penetrating mode, wherein the optical fiber comprises a proximal end body section and a distal end body section which are connected, and the spring tube is arranged in the outer tube in a penetrating mode and is coated on the proximal end body section.

Optionally, the outer tube includes the first body, transition body and the second body that link to each other in proper order, the external diameter of second body is less than the external diameter of first body, transition body is followed first body towards the direction of second body is the tapering form, near-end body section with the spring pipe wears to establish in the first body, far-end body section wears to establish the transition body with in the second body.

Optionally, the OCT imaging catheter further comprises an imaging lens disposed on a distal end of the distal body segment.

Optionally, an inclined plane is arranged at the distal end of the distal end body section, a reflecting surface is arranged on the imaging lens, and the reflecting surface is attached to the inclined plane.

Optionally, the OCT imaging catheter further includes a light-transmissive sheath that is sleeved over the imaging lens and the distal end of the distal body segment.

Optionally, the OCT imaging catheter further includes a buffer, the buffer being connected to the imaging lens.

Optionally, the OCT imaging catheter further comprises a visualization member disposed on the distal end of the outer tube;

optionally, the OCT imaging catheter further comprises a guidewire connected to the distal end of the outer tube.

Optionally, the distal end of the guidewire is a curved structure.

Optionally, the outer tube is a light-transmitting flexible structure.

The beneficial effect of OCT imaging catheter that this application provided lies in: compared with the prior art, the spring tube is coated on the proximal end body section of the optical fiber, and the distal end body section of the optical fiber is not coated with the spring tube, so that the outer diameter of the part of the outer tube corresponding to the distal end body section can be reduced, the diameter size of the distal end of the OCT imaging catheter can be greatly reduced, the trafficability of the OCT imaging catheter when the OCT imaging catheter shuttles in a blood vessel can be improved, and the OCT imaging catheter can be effectively ensured to be normally used in an intracranial blood vessel.

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 an OCT imaging catheter according to an embodiment of the present disclosure;

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

FIG. 3 is a schematic diagram of a portion of an OCT imaging catheter according to an embodiment of the present disclosure;

fig. 4 is a schematic diagram of a portion of an OCT imaging catheter according to an embodiment of the present application.

The main reference numerals illustrate:

10. an outer tube; 11. a first tube body; 12. a transition pipe body; 13. a second tube body; 20. a guide wire; 30. an optical fiber; 31. a proximal body section; 32. a distal body segment; 33. an inclined plane; 40. a spring tube; 50. an imaging lens; 51. a reflective surface; 60. a light-transmitting sheath; 70. a buffer member; 80. and a developing member.

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 4 together, an OCT imaging catheter according to an embodiment of the present application will be described, where dashed lines in each figure are light beams, and directions indicated by arrows are propagation directions of the light beams.

Referring to fig. 1, an OCT imaging catheter, comprising: an outer tube 10, an optical fiber 30, and a spring tube 40; the optical fiber 30 is inserted into the outer tube 10, wherein the optical fiber 30 includes a proximal end body section 31 and a distal end body section 32 connected to each other, and the spring tube 40 is inserted into the outer tube 10 and is coated on the proximal end body section 31.

The OCT imaging catheter further includes an imaging lens 50, the imaging lens 50 being disposed on the distal end of the distal body segment 32.

Compared with the prior art, the OCT imaging catheter provided by the application has the advantages that the spring tube 40 is coated on the proximal end body section 31 of the optical fiber 30, and the spring tube 40 is not coated on the distal end body section 32 of the optical fiber 30, so that the outer diameter of the part of the outer tube 10 corresponding to the distal end body section 32 can be reduced, the diameter size of the distal end of the OCT imaging catheter can be greatly reduced, the passing performance of the OCT imaging catheter in the process of intravascular shuttling can be improved, the OCT imaging catheter can smoothly pass through tiny and complex intracranial vessels, normal use of the OCT imaging catheter in the intracranial vessels can be effectively ensured, and the spring tube 40 can drive the optical fiber 30 and the imaging lens 50 to rotate and pull back in the outer tube 10, so that complete scanning imaging can be carried out on a target area of the vessels.

In some embodiments of the present application, the OCT imaging catheter further includes a guidewire 20, the guidewire 20 being coupled to the distal end of the outer tube 10, the distal body segment 32 being closer to the guidewire 20 than the proximal body segment 31. And through connecting the guide wire 20 at the distal end of the outer tube 10, the guide wire 20 is used for guiding the OCT imaging catheter to enter the target area in the blood vessel from outside the body, and no additional guide wire 20 is needed, namely no additional guide wire is needed for guiding the OCT imaging catheter from outside the body into the blood vessel, so that a guide wire hole for the additional guide wire to pass through is not needed to be arranged at the distal end of the outer tube 10, the outer diameter of the distal end of the outer tube 10 can be reduced, the diameter of the OCT imaging catheter can be further reduced, and the trafficability of the OCT imaging catheter in the process of shuttling in the blood vessel can be further improved.

Specifically, in use, after the entire OCT imaging catheter has reached the proximal end of the target area within the vessel under the guidance of the guidewire 20 and support by the outer tube 10, the distal end of the guidewire 20 passes through the target area to the distal end of the target area.

It should be noted that, the OCT imaging catheter of the present application is applicable not only to intracranial blood vessels, but also to tiny and tortuous micro-blood vessels at other parts of the body, such as blood vessels at the periphery of limbs or eyes, and the application range of the OCT imaging catheter of the present application is wide.

The outer tube 10 is the outermost layer of the OCT imaging catheter and is used to protect the optical fiber 30, the spring tube 40, and the imaging lens 50. The outer tube 10 is of a light-transmitting flexible structure, the light transmittance is good, the outer tube 10 has good softness and elasticity, namely, the outer tube 10 is good in flexibility, and damage to the inner wall of a blood vessel when the OCT imaging catheter shuttles in the blood vessel is effectively avoided.

Alternatively, the outer tube 10 is made of block polyetheramidamine (PEBAX, which may also be referred to as nylon elastomer). Alternatively, the outer tube 10 may also be made of a block polyether amide, a low density polyethylene (Low density Polyethylene, LDPE)) and a high density polyethylene (High Density Polyethylene, HDPE), specifically, the outer layer of the outer tube 10 is a block polyether amide layer, the middle layer of the outer tube 10 is a low density polyethylene layer, and the inner layer of the outer tube 10 is a high density polyethylene layer.

The outer diameter of the outer tube 10 varies with the diameter of the member in the outer tube 10, and the outer diameter of the outer tube 10 varies in positive correlation with the diameter of the member in the outer tube 10. For example, when the proximal body segment 31 of the optical fiber 30 is coated with the spring tube 40 and the distal body segment 32 of the optical fiber 30 is exposed without coating the spring tube 40, the outer diameter of the portion of the outer tube 10 corresponding to the proximal body segment 31 is larger and the outer diameter of the portion of the outer tube 10 corresponding to the distal body segment 32 is smaller. It will be appreciated that since the distal body section 32 of the optical fiber 30 does not cover the spring tube 40, the outer diameter of the distal end of the outer tube 10 can be reduced, thereby reducing the diameter of the distal end of the OCT imaging catheter.

Specifically, referring to fig. 1, the outer tube 10 includes a first tube body 11, a transition tube body 12 and a second tube body 13, which are sequentially connected, the outer diameter of the second tube body 13 is smaller than that of the first tube body 11, the second tube body 13 is used for passing through a small and complex intracranial blood vessel, the transition tube body 12 tapers from the first tube body 11 towards the second tube body 13, the maximum outer diameter of the transition tube body 12 is smaller than or equal to that of the first tube body 11, and the minimum outer diameter of the transition tube body 12 is larger than or equal to that of the second tube body 13. Through setting up the transition body 12 that is the tapering form between first body 11 and second body 13, reduced the junction stress concentration between first body 11 and the second body 13, prevent that outer tube 10 warp, be favorable to guaranteeing the intensity of outer tube 10, guaranteed the concentricity of outer tube 10, optic fibre 30 and spring pipe 40 simultaneously, make OCT imaging catheter have better push performance, in addition, increased OCT imaging catheter's smoothness for OCT imaging catheter is easier to pass through tiny and complicated intracranial blood vessel.

Further, the outer diameter of the first pipe body 11 is 0.7mm-0.9mm, the outer diameter of the second pipe body 13 is 0.45mm-0.5mm, and the outer diameter of the transition pipe body 12 is 0.45mm-0.7mm. Alternatively, the outer diameter of the first tube 11 is 0.86mm and the outer diameter of the second tube 13 is 0.45mm.

Further, the length of the second tube body 13 is 200-250mm. Optionally, the length of the second tube 13 is 200mm, 210mm, 220mm, 230mm, 240mm or 250mm.

A guidewire 20 is coupled to the distal end of the second tube 13. The outer diameter of the guide wire 20 is much smaller than the outer diameter of the second tube body 13. Further, the length of the guide wire 20 is 80-100mm, and the outer diameter of the guide wire 20 is 0.3-0.4 mm. Alternatively, the guide wire 20 may have a length of 80mm, 90mm or 100mm, and the guide wire 20 may have a diameter of 0.36mm.

The guide wire 20 may be a braided structure or a spring, and of course, the guide wire 20 may be made of the same material as the outer tube 10.

Further, the distal end of the guide wire 20 is of a curved structure, which is beneficial to increasing the flexibility of the guide wire 20 and effectively preventing the guide wire 20 from damaging the inner wall of the blood vessel. Of course, the distal end of the guidewire 20 may also be J-shaped in configuration.

In some embodiments of the present application, the proximal end of the guidewire 20 is welded to the distal end of the second tube 13. In other embodiments of the present application, the proximal end of the guidewire 20 is bonded to the distal end of the second tube 13, in particular, the proximal end face of the guidewire 20 is bonded to the distal end face of the second tube 13 by UV glue. Further, the guide wire 20 is gradually expanded towards the direction close to the second tube body 13, and the distal end of the second tube body 13 is gradually reduced towards the direction close to the guide wire 20, so that the proximal end face of the guide wire 20 is in contact with the distal end face of the second tube body 13 in a larger area, and the guide wire is bonded, thereby being beneficial to improving the stability of bonding between the guide wire 20 and the distal end of the second tube body 13. In other embodiments of the present application, the guide wire 20 may be integrally formed with the outer tube 10 when the guide wire 20 is made of the same material as the outer tube 10. It will be appreciated that in making the outer tube 10, the distal end of the outer tube 10 is elongated and tapered to form the guidewire 20.

In some embodiments of the present application, the distal end of the second tube 13 and the distal end of the guide wire 20 are both in a closed structure, so that blood and vascular tissues are effectively prevented from entering the outer tube 10 and the guide wire 20, a flushing-free function is realized, and meanwhile, artifacts generated by the guide wire 20 are effectively avoided.

The proximal end section 31 of the optical fiber 30 is disposed through the first tube 11, and the distal end section 32 of the optical fiber 30 is disposed through the transition tube 12 and the second tube 13. The optical fiber 30 is used for transmitting a light beam, for example, the OCT imaging catheter enters a target area of an intracranial blood vessel, that is, a lesion area, and a laser beam emitted by a laser is transmitted through the optical fiber 30, and is emitted to the imaging lens 50 for reflection, then the light-transmitting outer tube 10 is emitted to the inner wall of the blood vessel, and the light beam reflected by the inner wall of the blood vessel is emitted to the imaging lens 50 through the outer tube 10, is reflected to the optical fiber 30, and finally is returned through the optical fiber 30, so as to realize scanning imaging.

In some embodiments of the present application, the distal body segment 32 is coated with a protective layer. Because the distal end body section 32 of the optical fiber 30 is not covered by the spring tube 40, i.e. the distal end body section 32 of the optical fiber 30 is not protected by the spring tube 40, the distal end body section 32 of the optical fiber 30 is easy to be damaged, so that the distal end body section 32 of the optical fiber 30 is well protected by coating the distal end body section 32 with a protective layer, and phenomena such as bending or breakage of the distal end body section 32 of the optical fiber 30 when the distal end body section 32 shuttles at a narrow part in a blood vessel are effectively prevented.

Further, the protective layer is transparent. Optionally, the material of the protective layer is transparent polyimide.

The spring tube 40 is movably arranged in the second tube body 13 in a penetrating way, and the inner wall of the spring tube 40 is fixedly connected with the distal end body section 32 of the optical fiber 30. The spring tube 40 can drive the optical fiber 30 to pull back along the axial direction of the outer tube 10, and can also rotate around the own axis relative to the outer tube 10. Specifically, since the inner wall of the blood vessel is circumferential and the target area has a certain length, the optical fiber 30 and the imaging lens 50 need to be rotated and pulled back to obtain a complete image of the target area. The optical fiber 30 and the imaging lens 50 are driven to be pulled back along the axial direction of the outer tube 10 by the spring tube 40, and a rotating torque force is provided for the optical fiber 30 and the imaging lens 50 to enable the optical fiber 30 and the imaging lens 50 to rotate, so that the imaging lens 50 can perform complete scanning imaging on a target area.

Further, the outer diameter of the spring tube 40 is 0.5mm-0.6mm. Alternatively, the outer diameter of the spring tube 40 is 0.5mm or 0.6mm.

Alternatively, the spring tube 40 may be 304 stainless steel or 306 stainless steel.

Optionally, the inner wall of the spring tube 40 is bonded to the optical fiber 30.

The distance between the imaging lens 50 and the distal end of the outer tube 10 is 8mm-10mm, so that the outer tube 10 is effectively prevented from touching the imaging lens 50, and the imaging lens 50 is effectively prevented from being damaged. Alternatively, the imaging lens 50 is spaced from the distal end of the outer tube 10 by a distance of 10mm.

In some embodiments of the present application, referring to fig. 2, a bevel 33 is disposed on a distal end of the distal end body section 32, a reflective surface 51 is disposed on the imaging lens 50, the reflective surface 51 is attached to the bevel 33, and the reflective surface 51 is used for performing total reflection on the light beam. Specifically, the light beam in the optical fiber 30 is reflected by the reflecting surface 51 of the imaging lens 50, and then is emitted to the inner wall of the blood vessel through the outer tube 10, and the light beam reflected by the inner wall of the blood vessel is emitted to the imaging lens 50 through the outer tube 10, and is returned by the optical fiber 30 after being totally reflected by the reflecting surface 51 of the imaging lens 50, thereby realizing scanning imaging.

Optionally, a bevel 33 on the distal end of the distal body section 32 is ground.

Optionally, the imaging lens 50 is a prism, a lens, or is made of polyethylene terephthalate (Polyethylene terephthalate, PET for short). In the present embodiment, the imaging lens 50 is made of polyethylene terephthalate, and is capable of totally reflecting the light beam.

It should be noted that, in other embodiments of the present application, the light reflecting layer may be directly coated on the inclined surface 33 of the optical fiber 30.

In some embodiments of the present application, referring to fig. 3, the oct imaging catheter further includes a light-transmitting sheath 60, where the light-transmitting sheath 60 is sleeved on the distal ends of the imaging lens 50 and the distal end body section 32, so as to protect the distal ends of the imaging lens 50 and the distal end body section 32, and further prevent the optical fiber 30 and the imaging lens 50 from being damaged.

Optionally, the inner wall of the light transmissive sheath 60 is bonded to the imaging lens 50 and the distal body section 32.

Optionally, the light-transmitting sheath 60 is made of a light-transmitting material.

In other embodiments of the present application, referring to fig. 4, the oct imaging catheter further includes a buffer member 70, where the buffer member 70 is connected to the imaging lens 50. After the OCT imaging catheter enters the intracranial blood vessel, due to the complex bending of the blood vessel, the spring tube 40 can make the imaging lens 50 collide with the outer tube 10 during turning, or the spring tube 40 can make the imaging lens 50 collide with the outer tube 10 during forward transition extension, so that the buffer member 70 can play a better role in buffering when the imaging lens 50 collides with the outer tube 10 by arranging the buffer member 70 at the front end of the imaging lens 50, thereby being beneficial to further preventing the distal ends of the imaging lens 50 and the distal end body section 32 from being damaged.

Alternatively, the buffer member 70 may be a spring or made of other materials having a buffer function.

In some embodiments of the present application, referring again to fig. 1, the oct imaging catheter further includes a developing member 80, where the developing member 80 is disposed on the distal end of the outer tube 10, that is, the developing member 80 is disposed on the distal end of the second tube body 13, and the developing member 80 is used to mark the distal end position of the outer tube 10, that is, the external device identifies the developing member 80 to obtain the distal end position of the outer tube 10, so as to facilitate the observation of the medical staff.

Further, the distance between the developing member 80 and the imaging lens 50 is 3mm to 5mm. Alternatively, the distance between the developing member 80 and the imaging lens 50 is 3mm.

The OCT imaging catheter of the present application has at least the following beneficial effects:

1. by coating the spring tube 40 on the proximal end body section 31 of the optical fiber 30, and not coating the spring tube 40 on the distal end body section 32 of the optical fiber 30, the outer diameter of the portion of the outer tube 10 corresponding to the distal end body section 32 can be reduced, so that the diameter of the distal end of the OCT imaging catheter can be reduced, the passing performance of the OCT imaging catheter in the process of shuttling in blood vessels can be improved, the OCT imaging catheter can smoothly pass through tiny and complex intracranial blood vessels, and normal use of the OCT imaging catheter in the intracranial blood vessels can be effectively ensured.

2. By connecting the guide wire 20 to the distal end of the outer tube 10, the guide wire 20 is used for guiding the OCT imaging catheter to enter the target area in the blood vessel from outside the body, and no additional guide wire 20 is needed to guide the OCT imaging catheter from outside the body into the blood vessel, so that a guide wire hole for the additional guide wire 20 to pass through is not needed to be formed at the distal end of the outer tube 10, the space occupied by the guide wire hole of the outer tube 10 is omitted, the outer diameter of the distal end of the outer tube 10 is reduced, the diameter of the distal end of the OCT imaging catheter is further reduced, the passing performance of the OCT imaging catheter during shuttling in the blood vessel is further improved, and the flexibility of the OCT imaging catheter is also improved.

3. By coating the distal body segment 32 with the protective layer, the distal body segment 32 of the optical fiber 30 is well protected, and the phenomena of bending or breaking and the like of the distal body segment 32 of the optical fiber 30 when the distal body segment 32 shuttles at the narrow part in the blood vessel are effectively prevented.

4. The distal ends of the imaging lens 50 and the distal end body section 32 can be better protected by sleeving the light-transmitting sheath 60 on the distal ends of the imaging lens 50 and the distal end body section 32, or connecting the light-transmitting sheath 60 with the imaging lens 50 through the buffer member 70, or sleeving the light-transmitting sheath 60 on the distal ends of the imaging lens 50 and the distal end body section 32, and connecting the buffer member 70 with the light-transmitting sheath 60.

The foregoing description of the preferred embodiment of the present utility model is not intended to limit the utility model to the particular form disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the utility model.

Claims (10)

1. An OCT imaging catheter, comprising: an outer tube, an optical fiber and a spring tube; the optical fiber is arranged in the outer tube in a penetrating mode, wherein the optical fiber comprises a proximal end body section and a distal end body section which are connected, and the spring tube is arranged in the outer tube in a penetrating mode and is coated on the proximal end body section.

2. The OCT imaging catheter of claim 1, wherein: the outer tube comprises a first tube body, a transition tube body and a second tube body which are sequentially connected, the outer diameter of the second tube body is smaller than that of the first tube body, the transition tube body is gradually reduced from the first tube body to the direction of the second tube body, the proximal end body section and the spring tube are penetrated in the first tube body, and the distal end body section is penetrated in the transition tube body and the second tube body.

3. The OCT imaging catheter of claim 1, wherein: the imaging lens is arranged on the far end of the far end body section.

4. The OCT imaging catheter of claim 3, wherein: the imaging lens is characterized in that an inclined plane is arranged at the far end of the far end body section, a reflecting surface is arranged on the imaging lens, and the reflecting surface is attached to the inclined plane.

5. The OCT imaging catheter of claim 3, wherein: the imaging lens further comprises a light-transmitting sheath, and the light-transmitting sheath is sleeved on the imaging lens and the far end of the far-end body section.

6. The OCT imaging catheter of claim 3, wherein: the imaging lens further comprises a buffer piece, and the buffer piece is connected with the imaging lens.

7. The OCT imaging catheter of any one of claims 1-3, wherein: further comprising a developing member disposed on the distal end of the outer tube.

8. The OCT imaging catheter of any one of claims 1-3, further comprising a guidewire coupled to the distal end of the outer tube.

9. The OCT imaging catheter of claim 8, wherein: the distal end of the guide wire is of a bending structure.

10. The OCT imaging catheter of any one of claims 1-4, wherein: the outer tube is of a light-transmitting flexible structure.

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