CN116173372B

CN116173372B - Catheter assembly and imaging catheter

Info

Publication number: CN116173372B
Application number: CN202310459699.7A
Authority: CN
Inventors: 陈浚; 李学铭; 白晓淞
Original assignee: Innermedical Co ltd
Current assignee: Innermedical Co ltd
Priority date: 2023-04-26
Filing date: 2023-04-26
Publication date: 2023-08-01
Anticipated expiration: 2043-04-26
Also published as: CN116173372A

Abstract

The invention discloses a catheter assembly and an imaging catheter, wherein the catheter assembly comprises a catheter seat and an outer sheath tube, and a first pipeline and a second pipeline are arranged on the catheter seat; one end of the outer sheath tube is in butt joint with the catheter seat, and an imaging cavity is formed in the other end of the outer sheath tube in a hollow manner; the first cavity and the second cavity are arranged in the outer sheath tube along the axial direction; one end of the first cavity channel is communicated with the first pipeline, and the other end of the first cavity channel is communicated with the imaging cavity; one end of the second cavity is communicated with the second pipeline, and the other end of the second cavity is communicated with the imaging cavity. Through the design of first pipeline and second pipeline, keep the surface of sheath pipe intact, pour into and export contrast medium through first pipeline and second pipeline in the use, avoid the contrast medium to get into the blood vessel in, reduce the injury of contrast medium to the body that detects, and the surface of this pipe is complete, conveniently coats hydrophilic coating, simple process, and the coating is effectual, this modern design, convenient operation.

Description

Catheter assembly and imaging catheter

Technical Field

The invention relates to the technical field of medical instruments, in particular to a catheter assembly and an imaging catheter.

Background

With the increasing incidence of cardiovascular disease, intravascular imaging techniques are becoming increasingly popular in the clinic as a new diagnostic approach. The excellent performance of intravascular imaging techniques in vascular diagnosis makes them an indispensable medical tool in cardiovascular disease. The intravascular imaging technology is to intervene the catheter assembly in the blood vessel of the detected body to reach the focus position, and then collect data through the imaging module in the imaging inner core, so as to complete the exploration process. In the imaging process, in order to increase the image observation effect, a contrast agent needs to be injected before imaging so as to reduce interference and acquire a high-quality signal.

Currently, the existing catheter assembly needs to be injected with contrast medium in use, on one hand, the contrast medium can wash blood so as to reduce the interference of the blood on an imaging module and obtain a high-quality signal; on the other hand, the contrast agent is also a medium for imaging by the imaging module, and the imaging effect is good. Therefore, a liquid hole needs to be drilled at the front end of the outer catheter in the manufacturing process, and contrast agent can enter human blood through the liquid hole in use, but the contrast agent has adverse harm to human body, such as anaphylactic reaction, liver and kidney injury and the like; in addition, the imaging module of the catheter assembly is easier to contact with blood due to the existence of the liquid outlet hole, so that signal interference is caused, and the imaging effect and quality are affected; also makes the hydrophilic coating process complex and the flow complex.

Accordingly, the prior art is still in need of improvement and development.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, the present invention aims to provide a catheter assembly and an imaging catheter, which aims to solve the problems that in the prior art, when a contrast agent is injected into the catheter assembly, the catheter wall is required to be damaged, environmental pollution is easy to form, the hydrophilic coating on the surface is damaged, and the catheter is inconvenient to use.

The technical scheme of the invention is as follows:

a catheter assembly comprising a catheter hub and an outer sheath, the catheter hub having a first conduit and a second conduit disposed thereon; one end of the outer sheath tube is in butt joint with the catheter seat, and an imaging cavity is formed in the other end of the outer sheath tube in a hollow mode; the first cavity and the second cavity are arranged in the outer sheath tube along the axial direction; one end of the first cavity channel is communicated with the first pipeline, and the other end of the first cavity channel is communicated with the imaging cavity; one end of the second cavity is communicated with the second pipeline, and the other end of the second cavity is communicated with the imaging cavity.

The catheter assembly, wherein the first lumen is arranged along a central axis of the outer sheath; the second cavity is arranged outside the first cavity in a surrounding mode.

The catheter assembly is characterized in that at least two second cavities are arranged, and the at least two second cavities are arranged at intervals along the radial circumferential direction of the first cavity.

The catheter assembly is characterized in that the radial cross section of the second channels is semicircular, two second channels are arranged, and the two second channels are symmetrically arranged around the first channel.

The catheter assembly comprises a catheter seat, a first catheter body and a second catheter body, wherein the first catheter body and the second catheter body are symmetrically arranged on two sides of the catheter seat, and the catheter seat is in butt joint with the outer sheath; one end of the first pipeline is arranged in the first pipeline body; the other end of the first pipeline is arranged in the main body and is connected with the first cavity;

one end of the second pipeline is arranged in the second pipeline body; the other end of the second pipeline is arranged in the main body and is connected with the second cavity.

The diameter of the water inlet of the first pipeline is 0.25-1 mm; the diameter of the water outlet of the second pipeline is 0.25-1 mm; and/or the diameter of the radial cross section of the first cavity is 0.42-0.75 mm; the radial width of the second cavity is 0.025-0.08 mm.

The catheter assembly comprises a tip catheter, wherein the tip catheter is connected with the outer sheath tube, is arranged at one end of the outer sheath tube, which is away from the catheter seat, and is used for being connected with a guide wire.

The application also discloses an imaging catheter, which comprises a joint, an imaging inner core and the catheter assembly, wherein the catheter seat is sleeved on the joint, and a main pipeline is arranged on the catheter seat; the rear end of the imaging inner core is connected with the joint, and the front end of the imaging inner core extends into the imaging cavity along the main body pipeline and the first cavity.

The imaging catheter comprises a driving assembly, and the driving assembly is detachably spliced and matched with the catheter assembly.

The imaging catheter, wherein the imaging core comprises at least one of an ultrasound assembly and an optical assembly.

Compared with the prior art, the embodiment of the invention has the following advantages:

the catheter assembly disclosed by the invention is used in an imaging catheter, and contrast agent is injected into the imaging catheter, so that the image observation effect of a position to be detected can be improved in the imaging process. Specifically, the catheter seat is fixedly connected with the outer sheath tube in the manufacturing process, so that the first pipeline is in butt joint with the first cavity, and the second pipeline is in butt joint with the second cavity. Before the imaging work, the contrast agent is injected into the first pipeline, the contrast agent enters the first cavity channel through the first pipeline and then enters the imaging cavity, and along with the fact that the injected contrast agent fills the imaging cavity, the overflowed contrast agent enters the second cavity channel and even enters the second pipeline, so that when the contrast agent flows out from the outlet of the second pipeline, the contrast agent filled in the catheter can be judged, and continuous injection is not needed. It can be seen that the catheter assembly disclosed herein advantageously maintains adequate contrast in the imaging lumen and precisely controls the amount of contrast.

In addition, the catheter assembly disclosed herein, unlike conventional interventional catheters, does not require the injection of contrast medium through an opening in the outer tube, and thus the outer tube remains intact. The catheter assembly has good sealing performance, the internal structure can not contact with a detected body, no pollution is caused, the catheter assembly is convenient to recycle and reuse, and the cost is reduced; at the same time, the catheter assembly disclosed by the invention can prevent the contrast agent from entering into the blood vessel and avoid the damage of the contrast agent to the detected body.

In addition, the catheter assembly disclosed by the invention is convenient for injecting contrast agent, and the outer sheath tube is not required to be damaged, so that not only can the chip pollution caused by punching be avoided, but also the surface of the outer sheath tube can be kept complete, and the catheter assembly is convenient for entering and exiting a cavity in a detected body; the catheter assembly disclosed by the invention has the advantages of smooth and complete outer surface, convenience in subsequent hydrophilic coating process, simplified operation flow and good coating effect.

Drawings

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

FIG. 1 is a schematic view of a catheter assembly of the present invention;

FIG. 2 is a cross-sectional view taken along the AA' direction of FIG. 1;

FIG. 3 is a side view of a catheter hub of the present invention;

FIG. 4 is a schematic view of a portion of a catheter assembly of the present invention;

FIG. 5 is a schematic view of the structure of an imaging catheter of the present invention;

fig. 6 is a schematic view of a portion of an imaging catheter according to the present invention.

10, a catheter seat; 11. a main body; 12. a first tube body; 13. a second tube body; 20. an outer sheath; 21. an imaging cavity; 22. a first channel; 23. a second channel; 30. a tip catheter; 40. a joint; 50. and (3) imaging the kernel.

Detailed Description

In order to make the present invention better understood by those skilled in the art, the following description will make clear and complete descriptions of the technical solutions of the embodiments of the present invention with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Referring to fig. 1, 2 and 4, in one embodiment of the present application, a catheter assembly is disclosed, comprising a catheter hub 10 and an outer sheath 20, wherein the catheter hub 10 is provided with a first conduit and a second conduit; one end of the outer sheath 20 is in butt joint with the catheter seat 10, and an imaging cavity 21 is formed in the other end of the outer sheath in a hollow manner; and a first channel 22 and a second channel 23 are arranged in the outer sheath 20 along the axial direction; one end of the first cavity channel 22 is communicated with the first pipeline, and the other end is communicated with the imaging cavity 21; the second channel 23 has one end communicating with the second channel and the other end communicating with the imaging chamber 21.

The catheter assembly disclosed in this embodiment is used in an imaging catheter, and by injecting a contrast medium into the imaging catheter, the image viewing effect of the position to be detected can be increased during imaging. Specifically, the catheter base 10 and the outer sheath 20 are fixedly connected in the manufacturing process, so that the first pipeline is in butt joint with the first cavity channel 22, and the second pipeline is in butt joint with the second cavity channel 23. Before imaging, contrast agent is injected into the first pipeline, the contrast agent enters the first cavity channel 22 through the first pipeline and then enters the imaging cavity 21, and as the injected contrast agent fills the imaging cavity 21, overflowed contrast agent enters the second cavity channel 23 and even enters the second pipeline, so that when the contrast agent flows out from the outlet of the second pipeline is observed in the liquid injection process, the fact that the contrast agent is filled in the catheter can be judged, and continuous injection is not needed. It can be seen that the catheter assembly disclosed in this embodiment is advantageous for maintaining adequate contrast medium in the imaging lumen 21 and precisely controlling the amount of contrast medium used.

Specifically, unlike the conventional interventional catheter, the catheter assembly disclosed in this embodiment does not require the injection of contrast medium through the opening in the outer tube, so that the outer sheath 20 remains intact, and the inner cavity of the catheter assembly has good sealing performance, and the inner structure does not contact with the body to be detected, and is free from contamination, convenient for recycling, and beneficial to reducing cost. Meanwhile, the catheter assembly disclosed by the embodiment can prevent the contrast agent from entering the blood vessel and avoid the damage of the contrast agent to the detected body. For example, for some diabetics or allergic constitution patients, the imaging catheter manufactured by using the catheter assembly disclosed in the embodiment on the endoscope equipment is not suitable for being contacted with contrast agent, and the imaging catheter is less damaged when being intervened in the body, so that the influence on the health of the human body can be reduced, and the safety of the examination is convenient to improve.

Specifically, the catheter assembly in this embodiment is convenient for injecting the contrast agent, and does not need to destroy the outer sheath 20, so that not only can the debris pollution caused by perforation be avoided, but also the surface of the outer sheath 20 can be kept intact, and the lumen in the body to be detected can be conveniently accessed. In addition, the outer surface of the catheter assembly disclosed by the embodiment is smooth and complete, the subsequent process of coating the hydrophilic coating is convenient, the operation flow is simplified, and the coating effect is good.

Specifically, as one implementation of the present embodiment, the first lumen 22 is disclosed as being arranged along the central axis of the outer sheath 20; the second channel 23 is arranged around the outside of the first channel 22. The first channel 22 disclosed in this embodiment may be configured as a circular channel, disposed on the central axis of the outer sheath 20, extending in a straight direction, and the contrast agent may flow rapidly during injection to rapidly enter the imaging cavity 21. And the first cavity 22 is arranged at the center, the second cavity 23 is arranged at the periphery around the first cavity 22, and the inner space of the catheter is reasonably utilized, so that the contrast agent flows in the outer sheath 20 along the sequence of the first cavity 22, the imaging cavity 21 and the second cavity 23 in order, and the occurrence of blockage or backflow is reduced.

In actual use, the first channel 22 disclosed in this embodiment is further provided with an internal structure for imaging, so that the first channel 22 is disposed on the central axis of the outer sheath 20, which facilitates the rotation, bending, expansion and contraction of the internal structure, and increases flexibility of the catheter assembly during use.

In addition, the flow direction of the contrast agent in the first channel 22 faces the imaging cavity 21, so that the contrast agent also tends to push the internal structure to move toward the imaging cavity 21, which is beneficial to maintaining the stability of the internal structure during the injection process, and avoiding the occurrence of displacement of the internal structure caused by injection of the contrast agent.

Specifically, in another implementation manner of this embodiment, the second channel 23 may be configured as a channel with a circular arc-shaped cross section, and is disposed at the periphery of the first channel 22. The second channel 23 extends along the axial direction of the outer sheath 20 and is parallel to the first channel 22, and the flowing directions of the contrast agent in the first channel 22 and the second channel 23 are opposite in the injection process, but are along the axial direction of the outer sheath 20, so that the impact force generated by the contrast agent flowing in the injection process on the outer sheath 20 is small, and the situation that the outer sheath 20 is stressed to bend or twist is avoided.

Specifically, as another implementation manner of this embodiment, it is disclosed that at least two second channels 23 are provided, and at least two second channels 23 are disposed at intervals along the radial circumferential direction of the first channel 22. The second channel 23 disclosed in the present embodiment is provided around the first channel 22, and the channel space can be increased by increasing the cross-sectional area of the second channel 23, so that the contrast agent flow is facilitated, however, the side wall of the first channel 22 needs to be kept stable, and thus the second channel 23 cannot be provided as an annular channel.

In the embodiment, a plurality of second channels 23 are arranged around the periphery of the first channel 22, so that the periphery of the first channel 22 is connected with the outer wall of the outer sheath 20, and the stability is maintained; and increases the space inside the outer sheath 20, facilitating the exhaust and increasing the injection speed of the contrast agent. In particular, the number of second channels 23 may be set to two, three, four, five or more. In the manufacturing process, the operator can comprehensively consider factors such as difficulty of the manufacturing process and total liquid outlet efficiency of the second channels, and the number of the second channels 23 can be selected according to actual requirements.

As another implementation manner of this embodiment, as shown in fig. 2, it is disclosed that the radial cross-sectional shape of the second channels 23 is a semi-circular shape, and two second channels 23 are provided, and two second channels 23 are symmetrically disposed around the first channel 22. The second passages 23 disclosed in this embodiment are arranged in a semicircular shape, and the two second passages 23 are arranged symmetrically, so that the internal space of the outer sheath 20 is utilized as much as possible on the basis of keeping the first passages 22 stable, thereby facilitating rapid exhaust. Moreover, the primary channels 22 and the secondary channels 23 in the outer sheath 20 are arranged regularly, which is convenient for processing.

Specifically, in another implementation manner of this embodiment, the first and second conduits, the first channel 22 and the second channel 23 disclosed above may be exchanged, and the contrast medium is injected into the second channel 23 through the second conduit, and after the imaging cavity is filled with the contrast medium, the contrast medium flows from the first channel 22 to the first conduit until flowing out. That is, the catheter assembly disclosed in this embodiment may optionally select the first conduit or the second conduit for injecting the contrast agent, so that the catheter assembly is flexible to use, requires less positions of the catheter assembly, and is beneficial to being suitable for more use occasions.

As shown in fig. 3, as another implementation manner of this embodiment, the catheter seat 10 is disclosed to include a main body 11, and a first tube body 12 and a second tube body 13 symmetrically disposed at two sides of the main body 11, where the main body 11 is butted with the outer sheath 20; one end of the first pipe is arranged in the first pipe body 12; the other end of the first pipe is arranged in the main body 11 and is connected with the first cavity channel 22; one end of the second pipeline is arranged in the second pipe body 13; the other end of the first pipe is disposed in the main body 11 and connected to the second chamber 23.

Specifically, when the first pipe is a liquid injection pipe, the first pipe is disposed in the first pipe body 12, and an outlet of the first pipe is disposed in the main body 11, so that the first pipe is in conduction with the first cavity 22 in the outer sheath 20; the second pipe is disposed in the second pipe body 13, and an inlet of the second pipe is disposed in the main body 11 so that the second pipe is in communication with the second lumen 23 in the outer sheath 20. Similarly, when the first pipe is a liquid outlet pipe, the inlet of the first pipe is disposed in the main body 11, so that the first pipe is in communication with the first lumen 22 in the outer sheath 20; the second pipe is disposed in the second pipe body 13, and an outlet of the second pipe is disposed in the main body 11, so that the second pipe is in communication with the second lumen 23 in the outer sheath 20.

In this embodiment, the first tube body 12 and the second tube body 13 are disposed, and not only the first tube is disposed on the catheter holder 10, but also the second tube is disposed on the catheter holder 10, so that the outlet of the second lumen 23 is connected to one end of the catheter holder 10, i.e. the fixed section of the outer sheath 20, so that the free end of the outer sheath 20 is kept closed, and the surface is complete, thereby facilitating insertion into the body to be detected. The first pipe body 12 and the second pipe body 13 are symmetrically arranged, so that balance of the catheter seat 10 is kept, and liquid injection operation is facilitated; in other embodiments, the first tube 12 and the second tube 13 may be disposed asymmetrically.

Specifically, as another implementation of the present example, it is disclosed that the outer surface of the outer sheath 20 is coated with a hydrophilic coating. Since frictional damage is easily generated during mechanical intervention in the body of the subject, a hydrophilic coating, such as hydrogel, is coated on the outer surface of the outer sheath 20. The sheath tube 20 disclosed in this embodiment has good sealing property and complete surface, and can more smoothly stretch and retract in the cavity of the body to be detected after being coated with the hydrophilic coating, so that the sheath tube can be conveniently and smoothly placed in a position to be detected.

In particular, hydrophilic coatings have hydrophilic properties, and from a physical point of view the chemical interaction between the coating and water forms a gel material that exhibits an extremely low coefficient of friction. In general, these chemical and physical characteristics characterize a wettable, lubricious material suitable for specific biological interactions, and are applied to the surface of the interventional instrument to facilitate penetration of the instrument through the natural lumen, avoiding possible puncture and frictional damage.

Specifically, as another implementation mode of the embodiment, a diameter of the water inlet of the first pipeline is 0.25-1 mm; the diameter of the water outlet of the second pipeline is 0.25-1 mm; and/or the diameter of the radial cross section of the first channel 22 is 0.42-0.75 mm; the radial width of the second channel 23 is 0.025-0.08 mm. The catheter assembly disclosed in this embodiment is used by injecting contrast medium into the imaging lumen 21, and if the injection of contrast medium is too fast, the internal deformation of the outer sheath 20 is easily caused; and too slow injection of contrast agent can affect the injection speed and reduce the working efficiency. Therefore, by controlling the diameter of the water inlet of the first pipe and the diameter of the water outlet of the second pipe, or controlling the radial cross-section area of the first channel 22 and the radial width of the second channel 23, the speed of injecting the contrast agent is controlled, and the problem of overlarge pressure generated in the first channel 22 or the second channel 23 is avoided while the injection efficiency is maintained.

Specifically, in this embodiment, the diameter of the water inlet of the first pipe is 0.5 mm, the diameter of the water outlet of the second pipe is 0.5 mm, the speed of injecting the contrast agent can be kept high during the injection process, and the air in the inner cavity of the outer sheath 20 can be rapidly discharged from the second pipe.

Specifically, in actual use, the first channel 22 is further provided with internal structures, such as an imaging device, an electrical device, an ultrasonic device, and the like. The diameter of the conventional internal structure is 0.4-0.7 mm, and the diameter of the radial cross section of the first channel 22 is set to be 0.42-0.75 mm in this embodiment, so that a sufficient gap is left between the internal structure and the side wall of the first channel 22, which can reduce friction during assembly and use, and also can leave a sufficient space for injecting contrast medium into the imaging cavity 21.

In addition, when the inner structure with the diameter of 0.7 mm is adopted, and the diameter of the radial cross section of the first cavity channel 22 is set to be 0.75 mm, the transverse width of the space where the contrast agent reserved in the first cavity channel 22 flows is about 0.05 mm, and correspondingly, the radial width of the second cavity channel 23 can be set to be 0.05 mm, so that the flow velocity of the contrast agent in the first cavity channel 22 and the second cavity channel 23 can be kept to be consistent, the pressure in the first cavity channel 22 and the second cavity channel 23 can be kept to be more uniform, and the situation that the local stress concentration on the sheath tube 20 is caused to rupture or twist can be avoided.

Specifically, as another implementation of the present embodiment, the outer sheath 20 is disclosed as being adhesively connected to the catheter hub 10. The outer sheath 20 disclosed in this embodiment is adhered to the catheter base 10, and is fixedly connected, and compared with the mechanical connection mode, no connection gap is formed after the adhesive is adopted for adhering, so that the first pipeline and the first cavity channel 22 are conducted to form a complete liquid inlet channel, the second pipeline and the second cavity channel 23 are conducted to form a complete liquid outlet channel, and both channels have no gap, thereby avoiding the liquid leakage problem.

In actual manufacturing, the embodiment can adopt shadowless glue (UV glue) for bonding, and the shadowless glue has the advantages of good bonding effect on plastics and various materials, accurate positioning, difficult cracking, difficult degumming, good flexibility and the like, so that the outer sheath 20 is firmly connected with the catheter base 10.

As another implementation of this embodiment, as shown in fig. 1, the catheter assembly is disclosed to include a tip catheter 30, where the tip catheter 30 is connected to the outer sheath, and is disposed at an end of the outer sheath facing away from the catheter hub, and is used for connecting a guide wire. In this embodiment, the tip catheter 30 is disposed at the front end of the outer sheath 20, and the guide wire lumen is disposed on the tip catheter 30 for passing through the guide wire, so that the advancing direction of the catheter assembly is controllable. When in use, an operator controls the bending direction of the front end of the catheter assembly from the rear end, so that the direction can be continuously adjusted in the detected body, and the detected body can move along the natural cavity, thereby reducing collision.

As shown in fig. 5 and 6, as another embodiment of the present application, an imaging catheter is disclosed, which includes a joint 40, an imaging core 50, and a catheter assembly as described in any one of the above, the catheter base 10 is sleeved on the joint 40, and a main body pipe is disposed on the catheter base 10, and is in communication with the first pipe; the rear end of the imaging core 50 is connected to the joint 40, and the front end of the imaging core 50 extends into the imaging cavity 21 along the main body duct and the first cavity duct 22.

Specifically, the joint 40 disclosed in the present embodiment is provided on a control device, and imaging information is sent to the imaging core 50 provided on the joint 40 by the control device, and movement of the imaging core 50 is controlled. The joint 40 and the outer sheath 20 can be connected and fixed in a welding, inserting, screwing and other modes, so that the stability of the use process is kept.

Specifically, the catheter seat 10 disclosed in this embodiment is configured as a tee structure, and may be directly sleeved on the joint 40, or may be fixed on the joint 40 by interference fit, adhesion, welding, or the like, so as to maintain stability.

In particular, as another implementation of the present embodiment, it is disclosed that the imaging core 50 includes at least one of an ultrasound assembly and an optical assembly. The catheter assembly disclosed in this embodiment may be assembled into an ultrasound assembly, such as a combination structure employing a spring tube end to secure an ultrasound transducer, and acquiring tomographic images of the location to be detected by transmitting and receiving ultrasound signals for probing. The optical assembly may also be assembled, for example by probing the location to be inspected with an optical fiber-optic propagating optical signal. In the case of satisfying the above two usage scenarios, the imaging core 50 disclosed in the present embodiment may be set as a dual-mode imaging core 50, that is, an ultrasound component and an optical component are set at the same time, so as to obtain a more complete imaging effect with better image quality.

Specifically, as one implementation of the present embodiment, the imaging catheter is disclosed as including a drive assembly that is removably insertable into engagement with the catheter assembly. The driving assembly disclosed in the embodiment comprises a control mode of mechanical transmission by adopting a driving motor, a driving motor and the like, and can be controlled manually by an operator or automatically by adopting an intelligent terminal, so that the catheter assembly can flexibly move in a natural cavity channel with complex bending in a detected body.

In particular, in the medical field, the catheter assembly to be placed in the human body is often disposable, so that the catheter assembly needs to be frequently replaced in the use process, and cross infection among different human bodies is avoided. The catheter assembly and the driving assembly in the embodiment can be detachably connected, in particular, a quick-release button can be arranged on the connector 40, and the detachable matching is realized quickly through the output structure of the connector 40 and the driving assembly, so that the effect of saving the time for replacing the catheter assembly is achieved; in addition, the type of the catheter assembly is convenient and flexible to select, so that the catheter assembly can adapt to various use environments.

In summary, the present application discloses a catheter assembly, which includes a catheter hub 10 and an outer sheath 20, where a first pipe and a second pipe are disposed on the catheter hub 10; one end of the outer sheath 20 is in butt joint with the catheter seat 10, and an imaging cavity 21 is formed in the other end of the outer sheath in a hollow manner; and a first channel 22 and a second channel 23 are arranged in the outer sheath 20 along the axial direction; one end of the first cavity channel 22 is communicated with the first pipeline, and the other end is communicated with the imaging cavity 21; the second channel 23 has one end communicating with the second channel and the other end communicating with the imaging chamber 21.

The catheter assembly disclosed in this embodiment is used in an imaging catheter, and by injecting a contrast medium into the imaging catheter, the image viewing effect of the position to be detected can be increased during imaging. Specifically, the catheter base 10 and the outer sheath 20 are fixedly connected in the manufacturing process, so that the first pipeline is in butt joint with the first cavity channel 22, and the second pipeline is in butt joint with the second cavity channel 23.

Before imaging, contrast agent is injected into the first pipeline, the contrast agent enters the first cavity channel 22 through the first pipeline and then enters the imaging cavity 21, and as the injected contrast agent fills the imaging cavity 21, overflowed contrast agent enters the second cavity channel 23 and even enters the second pipeline, so that when the contrast agent flows out from the outlet of the second pipeline is observed in the liquid injection process, the fact that the contrast agent is filled in the catheter can be judged, and continuous injection is not needed. It can be seen that the catheter assembly disclosed in this embodiment is advantageous for maintaining adequate contrast medium in the imaging lumen 21 and precisely controlling the amount of contrast medium used.

Specifically, unlike the conventional interventional catheter, the catheter assembly disclosed in this embodiment does not require the injection of contrast medium through the opening in the outer tube, so that the outer sheath 20 remains intact, and the inner cavity of the catheter assembly has good sealing performance, and the inner structure does not contact with the body to be detected, and is free from contamination, convenient for recycling, and beneficial to reducing cost. Meanwhile, the catheter assembly disclosed by the embodiment can prevent the contrast agent from entering the blood vessel and avoid the damage of the contrast agent to the detected body.

It should be noted that, without conflict, the embodiments and features of the embodiments in the present application may be combined with each other.

It should be noted that the present invention is described with reference to the specific structure and working principle of the present invention by taking the catheter assembly as an example, but the application of the present invention is not limited to the catheter assembly, and may be applied to the production and use of other similar workpieces.

It is to be understood that the invention is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the invention is limited only by the appended claims.

The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims

1. An imaging catheter for intravascular imaging, comprising:

a joint;

the guide tube seat is arranged on the joint and is provided with a main body pipeline, a first pipeline and a second pipeline;

an outer sheath tube, one end of which is in butt joint with the catheter seat, and the other end of which is hollow and is provided with an imaging cavity; the first cavity and the second cavity are arranged in the outer sheath tube along the axial direction; one end of the first cavity channel is communicated with the first pipeline, and the other end of the first cavity channel is communicated with the imaging cavity; one end of the second cavity channel is communicated with the second pipeline, and the other end of the second cavity channel is communicated with the imaging cavity;

an imaging core, one end of which is connected with the joint, and the other end of which extends into the imaging cavity along the main body pipeline and the first cavity;

the first cavity is a circular channel and is arranged along the central axis of the outer sheath; the second cavity is arranged outside the first cavity in a surrounding manner;

the second channels are arranged at least two, and the at least two second channels are arranged at intervals along the radial circumferential direction of the first channel;

the radial cross section of the second cavity is semicircular, two second cavities are symmetrically arranged around the first cavity;

the diameter of the imaging inner core is 0.4-0.7 mm; the diameter of the radial cross section of the first cavity is 0.42-0.75 mm; the radial width of the second cavity is 0.025-0.08 mm.

2. The imaging catheter for intravascular imaging according to claim 1, wherein the catheter hub comprises a main body, and a first tube and a second tube symmetrically disposed on both sides of the main body, the main body interfacing with the outer sheath;

one end of the first pipeline is arranged in the first pipeline body; the other end of the first pipeline is arranged in the main body and is connected with the first cavity;

3. The imaging catheter for intravascular imaging according to claim 1, wherein the water inlet of the first tube has a diameter of 0.25-1 millimeter; the diameter of the water outlet of the second pipeline is 0.25-1 mm.

4. The imaging catheter for intravascular imaging according to claim 1, wherein the imaging catheter comprises a tip catheter, the tip catheter being connected to the outer sheath, disposed at an end of the outer sheath facing away from the catheter hub, for connection to a guide wire.

5. An imaging catheter for intravascular imaging according to claim 1, wherein the imaging catheter includes a drive assembly that removably mates with the hub.

6. The imaging catheter for intravascular imaging according to claim 1, wherein the imaging core comprises at least one of an ultrasound assembly and an optical assembly.