CN116585595A

CN116585595A - Contrast catheter

Info

Publication number: CN116585595A
Application number: CN202310639724.XA
Authority: CN
Inventors: 请求不公布姓名
Original assignee: Beijing Wansi Medical Equipment Co ltd
Current assignee: Beijing Wansi Medical Equipment Co ltd
Priority date: 2023-05-31
Filing date: 2023-05-31
Publication date: 2023-08-15

Abstract

The invention relates to the field of medical instruments and discloses a radiography catheter. The contrast catheter comprises a conveying pipe and a guide head with a closed outer surface, a conveying channel is arranged in the conveying pipe, a liquid outlet communicated with the conveying channel is formed in the periphery of the end part of the conveying pipe, the guide head is arranged at one end of the conveying pipe, which is provided with the liquid outlet, and the guide head is configured to drive the conveying pipe to pass through a blood vessel. The contrast catheter provided by the invention can drive the delivery pipe to pass through the blood vessel through the guide head, so that the guide head can be conveniently operated in place, namely the delivery pipe can be conveniently operated in place, thus not only can the accurate over-selection and the safe in-place actions of different blood vessel branches be realized, but also the in-place high-efficiency operation can be realized, simultaneously, the operation of repeatedly withdrawing the guide wire and repeatedly switching the Y valve in the operation is omitted, the labor intensity of medical staff is greatly reduced, the operation efficiency is improved, and the risks of surgical infection and complications are further reduced.

Description

Contrast catheter

Technical Field

The invention relates to the field of medical instruments, in particular to a radiography catheter.

Background

Minimally invasive vascular interventional procedures are widely used as a treatment means for vascular diseases which are commonly used at the present stage. However, in the existing angiographic procedure, the doctor often needs to guide the catheter in place through the guide wire, withdraw the guide wire out of the body after the catheter is in place, and close the Y valve after withdrawing the guide wire out of the body. And after one angiography is completed, the Y valve needs to be opened again, the guide wire is threaded into the catheter, the catheter is guided to the other vascular branch, and after the guide wire is guided in place, the guide wire needs to be withdrawn out of the body again. This is repeated. One operation often requires repeated operations of withdrawing the guide wire and opening and closing the Y valve, which not only affects the convenience of the operation, but also increases the risk of surgical infection and complications.

Disclosure of Invention

In order to solve the above technical problems or at least partially solve the above technical problems, the present invention provides a radiography catheter.

The present invention provides a contrast catheter comprising:

the conveying pipe is internally provided with a conveying channel, and the periphery of the end part of the conveying pipe is provided with a liquid outlet communicated with the conveying channel;

the guide head with the closed outer surface is arranged at one end of the conveying pipe, which is provided with the liquid outlet, and the guide head is configured to guide the conveying pipe to pass through the blood vessel.

Optionally, the hardness of the introducer is less than the hardness of the delivery tube.

Optionally, the guide head comprises a support section connected with the conveying pipe and a guide section arranged at the end part of the support section, wherein the hardness of the guide section is smaller than that of the support section.

Optionally, the support section comprises a first guide wire and a support structure wound on the first guide wire, the guide section comprises a second guide wire, and the first guide wire and the second guide wire are integrally formed.

Optionally, the conveying pipe comprises a conveying section and a liquid outlet section connected with one end of the conveying section, the conveying channel is formed in the conveying section and the liquid outlet section, and the liquid outlet is formed in the peripheral wall of the liquid outlet section.

Optionally, the hardness of the out-feed section is less than the hardness of the delivery section.

Optionally, the liquid outlet section and the conveying section are integrally formed.

Optionally, the radial dimension of the guiding head is smaller than the radial dimension of the conveying section, the liquid outlet section is a conical pipe, and the diameter of the liquid outlet section gradually decreases along the direction of the conveying section towards the guiding head.

Optionally, the connection parts of the liquid outlet section, the conveying section and the guide head are respectively smooth curved surfaces.

Optionally, the liquid outlet is a plurality of, and a plurality of the liquid outlet is followed the circumference direction of conveyer pipe evenly sets up.

Optionally, the liquid outlet is a liquid outlet channel, and the liquid outlet direction of the liquid outlet channel is parallel to the liquid delivery direction of the delivery pipe.

Optionally, the seeker is of solid construction.

Compared with the prior art, the technical scheme provided by the embodiment of the invention has the following advantages:

when the contrast catheter provided by the invention is used, the guide head can drive the conveying pipe to pass through the blood vessel, so that the conveying pipe is driven to move to the target position, then, the contrast agent is introduced through the conveying channel of the conveying pipe and is discharged to the target position through the liquid outlet at the end part of the conveying pipe, and the contrast operation can be performed at the target position. In addition, the optimized radiography catheter does not need to be provided with a guide wire structure, so that the use of consumable materials is further reduced, the operation cost of a patient is reduced, and meanwhile, through the integrated design, the operation of repeatedly withdrawing the guide wire and repeatedly opening and closing the Y valve in an operation is omitted, the labor intensity of medical staff is greatly reduced, the operation efficiency is improved, and the risks of surgical infection and complications are further reduced.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.

FIG. 1 is a schematic view of a contrast catheter according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of a catheter according to an embodiment of the present invention;

FIG. 3 is a schematic view of the liquid outlet direction of the liquid outlet according to the embodiment of the present invention;

FIG. 4 is a schematic cross-sectional view of a liquid outlet direction of a liquid outlet according to an embodiment of the present invention;

fig. 5 is a cross-sectional view of an arrangement of the liquid outlet section according to an embodiment of the present invention.

Description of the reference numerals

1. A delivery tube; 11. a conveying section; 12. a liquid outlet section; 13. a liquid outlet; 14. a conveying channel; 2. a guide head; 21. a support section; 21a, a first guide wire; 21b, spring coils; 22. a guide section; 22a, a second guide wire.

Detailed Description

In order that the above objects, features and advantages of the invention will be more clearly understood, a further description of the invention will be made. The embodiments of the present invention and the features in the embodiments may be combined with each other without collision.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced otherwise than as described herein; it is apparent that the embodiments in the specification are only some embodiments of the present invention, but not all embodiments.

As shown in fig. 1 and 2, an imaging catheter according to an embodiment of the present invention includes a delivery tube 1 and a seeker 2 with an outer surface closed.

The inside of the conveying pipe 1 is provided with a conveying channel 14, the conveying channel 14 can be used for flowing liquid such as contrast agent, and the periphery of the end part of the conveying pipe 1 is provided with a liquid outlet 13 communicated with the conveying channel 14, so that the liquid such as contrast agent can flow out through the liquid outlet 13. Correspondingly, one end of the conveying channel 14 far away from the liquid outlet 13 is provided with a liquid inlet communicated with the conveying channel 14, so that liquid such as contrast agent can flow into the conveying channel 14 through the liquid inlet, and flow out of the liquid outlet 13 after being conveyed by the conveying channel 14, so as to enter a target position, and corresponding contrast operation is realized. The seeker 2 with the closed outer surface is arranged at one end of the conveying pipe 1, which is provided with the liquid outlet 13, wherein the connection mode of the seeker 2 and the conveying pipe 1 is not limited, and the connection strength requirement is only required to be ensured. The seeker 2 is configured to guide the delivery tube 1 to pass through the blood vessel, wherein the configuration mode of the seeker 2 is not limited, and only needs to ensure that the seeker 2 can drive the delivery tube 1 to pass through the blood vessel.

When the contrast catheter provided by the invention is used, the guide head 2 can drive the conveying pipe 1 to pass through a blood vessel, so as to drive the conveying pipe 1 to move to a target position, then, a contrast agent is introduced through the conveying channel 14 of the conveying pipe 1 and is discharged to the target position through the liquid outlet 13 at the end part of the conveying pipe, and the contrast operation can be performed at the target position. In addition, the optimized radiography catheter does not need to be provided with a guide wire structure, so that the use of consumable materials is further reduced, the operation cost of a patient is reduced, and meanwhile, through the integrated design, the operation of repeatedly withdrawing the guide wire and repeatedly opening and closing the Y valve in an operation is omitted, the labor intensity of medical staff is greatly reduced, the operation efficiency is improved, and the risks of surgical infection and complications are further reduced.

The hardness of the seeker 2 of the present application is less than that of the delivery tube 1, i.e. the head end of the contrast catheter (seeker 2) is of flexible construction. Under this kind of design mode, the relatively less seeker 2 of hardness of radiography pipe is preferential with the blood vessel contact to avoid radiography pipe to harm the vascular wall, realized that this radiography pipe head end is walked in the blood vessel, guaranteed the security that this radiography pipe was advanced, simultaneously, conveyer pipe 1 can support and push seeker 2 to walk in the blood vessel along the direction of guidance of seeker 2 under the guide effect of seeker 2, so that radiography pipe can remove the assigned position.

The sealing of the outer surface of the guide head 2 can realize the function of guiding the conveying pipe 1 to pass through the blood vessel. Preferably, the introducer 2 is flexible so that it does not easily puncture the vessel wall as it passes intravascularly. In addition, the outer surface of the seeker 2 is arranged smoothly, which is more beneficial for the seeker to pass through the blood vessel.

In some embodiments, the seeker 2 is a closed hollow structure, and the seeker 2 is arranged to be a hollow structure, so that the seeker 2 has certain flexibility and does not damage the vessel wall of a human body. In one embodiment, the hollow portion of the seeker 2 is located at the head of the seeker 2, the hollow portion of the seeker 2 not communicating with the delivery channel 14 in the delivery tube. In another embodiment, the hollow portion of the seeker 2 is in communication with the delivery channel, and at this time, the stiffness of the seeker 2 should meet the requirement of being able to drive the delivery tube 1 to pass through the blood vessel, and at the same time, the seeker 2 should be able to rotate along with the delivery tube 1, so that the contrast catheter can perform linear delivery and rotational delivery. Under this kind of design mode, liquid such as contrast agent can flow to the seeker 2 through transfer passage 14 in the transportation process, liquid such as contrast agent is full of the seeker 2 after, and rethread liquid outlet 13 flows out to the assigned position, and wherein, hollow seeker 2 can play the cushioning effect for the flow of contrast agent, avoids liquid such as contrast agent to directly flow out liquid outlet 13 through transfer passage 14, and then avoids the too fast velocity of flow of liquid such as contrast agent that flows out through liquid outlet 13, appears that liquid such as contrast agent is strikeed the phenomenon emergence to the blood vessel.

In other embodiments, the seeker 2 is of a solid structure, and the design mode can increase the convenience of processing the seeker 2, ensure the structural strength of the seeker 2, and increase the torsion control property of the seeker 2, so that the front end seeker 2 can rotate along with the conveying pipe 1 when the conveying pipe 1 is rotated in the rotary conveying process of the contrast pipe, avoid the phenomenon that the seeker 2 and the conveying pipe 1 rotate relatively, and ensure the conveying accuracy of the contrast pipe. In addition, in this design, the liquid such as the contrast agent does not enter the guide head 2, so that the liquid such as the contrast agent directly flows out from the liquid outlet 13 at the end of the conveying pipe 1, the contrast efficiency is increased, and the phenomenon of wasting the liquid such as the contrast agent is avoided. Furthermore, the seeker 2 is of a solid structure, so that the manufacturing is convenient.

The hardness of the part, which is away from the conveying pipe 1, of the guide head 2 is smaller than that of the part, which is close to the conveying pipe 1, of the guide head 2, so that the guide head 2 can pass through a blood vessel to drive the conveying pipe 1 to pass through the blood vessel, and the phenomenon that the guide head 2 is blocked and folded in the blood vessel is avoided. In addition, the design mode enables the hardness of the part of the seeker 2 which is preferentially contacted with the blood vessel to be smaller, and reduces or avoids the damage of the seeker 2 to the blood vessel, so that the seeker 2 can safely pass through the blood vessel. In this embodiment, the seeker 2 is relatively soft, has flexibility, facilitates guiding at the front end, and simultaneously, the part of the seeker 2 close to the conveying pipe 1 is harder than the part of the seeker 2 away from the conveying pipe 1, so that the head of the seeker 2 can be supported, the seeker 2 can move forward in the blood vessel with a certain supporting force, the seeker 2 is ensured to move relatively vertically (in a direction parallel to the blood vessel) in the blood vessel, the controllability of the seeker 2 is enhanced, and the super-selection and guiding of the blood vessel are facilitated.

In some embodiments, the seeker 2 gradually decreases in hardness in a direction away from the delivery tube 1 such that the seeker 2 gradually softens in hardness. This kind of design mode makes the seeker 2 take precedence and the part of vessel contact softest, and then avoids seeker 2 and vessel contact back, causes the damage to the vessel to, the rigidity of seeker 2 orientation conveyer pipe 1's direction increases gradually, realizes flexible transition, and makes the great part of seeker 2 can prop up whole seeker 2, and the seeker 2 of being convenient for drives conveyer pipe 1 and walks in the vessel.

The gradual hardness change of the seeker 2 can be realized by changing the diameter of the seeker 2, namely, the diameter of the seeker 2 is relatively larger at the position with larger hardness, and the diameter of the seeker 2 is relatively reduced at the position with smaller hardness. That is, the seeker 2 may be tapered in diameter to achieve a taper in stiffness.

Or, a supporting structure is arranged on the periphery of the seeker 2, wherein the supporting structure can be a guide wire, the supporting structure is relatively dense at the position with higher hardness requirement of the seeker 2, and the supporting structure is relatively loose at the position with lower hardness requirement of the seeker 2, so that the hardness of each position of the seeker 2 is different. That is, the seeker 2 can achieve the gradation in hardness by the degree of density of the support structures arranged at the outer periphery thereof.

It can be seen that the manner of hardness gradation of the seeker 2 is not limited as long as the hardness gradation effect can be achieved.

In other embodiments, as shown in fig. 1, 2 and 4, the guide head 2 includes a support section 21 connected to the delivery tube 1 and a guide section 22 disposed at an end of the support section 21, where the guide section 22 has a hardness less than that of the support section 21, and the support section 21 can support the guide section 22, so as to ensure that the guide section 22 relatively vertically (parallel to the blood vessel) passes through the blood vessel, thereby enhancing the controllability of the guide head 2 and facilitating the over-selection and guidance of the blood vessel.

The design mode enables the seeker 2 to be arranged in a segmented mode, and the seeker 2 of different segments has different hardness. The guiding section 22, which is preferentially contacted with the blood vessel, has low hardness, good softness and low plasticity, and aims to be used as a head end of the blood vessel which is firstly contacted, ensure that the vessel wall is not damaged to avoid damage to the blood vessel, and enable the flexible guiding section 22 to pass through the blood vessel so as to realize safe progressive and rotation of the guiding section 22 in the unknown blood vessel, select different blood vessel branches and ensure that the guiding head 2 can drive the conveying pipe 1 to move to a target position. The support section 21 is made of hard materials, so that the support of the guide section 22 can be effectively realized, and the super-selection and the guide of blood vessels are facilitated.

As a possible implementation manner, a supporting structure is arranged at a position, close to the conveying pipe 1, of the periphery of the seeker 2, and no supporting structure is arranged at a position, far away from the conveying pipe 1, of the seeker 2, so that the part, far away from the conveying pipe 1, of the seeker 2 is relatively soft, the part, close to the conveying pipe 1, of the seeker 2 is relatively hard, a supporting effect can be achieved on the head of the seeker 2, and the head of the seeker 2 is kept upright, so that the seeker is beneficial to pass through a blood vessel. Specifically, as shown in connection with fig. 2 and 4, the support section 21 includes a first guide wire 21a and a support structure wound around the first guide wire 21a to increase the stiffness of the first guide wire 21a by the support structure, and the guide section 22 includes a second guide wire 22a. Specifically, one end of the first guide wire 21a is connected to the delivery tube 1, and the other end of the first guide wire 21a is connected to the second guide wire 22a, wherein the connection mode of the first guide wire 21a and the delivery tube 1 and the connection mode of the first guide wire 21a and the second guide wire 22a are not limited, and only the connection strength needs to be ensured.

Preferably, the first guide wire 21a and the second guide wire 22a of the present application are integrally formed to increase the convenience of manufacturing the seeker 2, and at the same time, the structural strength of the seeker 2 can be increased, the problem of separation of the connection positions of the first guide wire 21a and the second guide wire 22a due to the split design is avoided, and the safety of use is ensured. In this design, after the first guide wire 21a, the second guide wire 22a and the guide head 2 are machined, a support structure is provided on the outer periphery of the first guide wire 21 a.

In addition, under this kind of design mode, the material of first guide wire 21a is the same with second guide wire 22a to increase the intensity of first guide wire 21a through bearing structure, and then make first guide wire 21a play the supporting effect to second guide wire 22a, be convenient for whole seeker 2 to walk in the blood vessel. The material used for the guide head 2 includes, but is not limited to, a material with good flexibility such as silicone, teflon, etc., for example, the first guide wire 21a and the second guide wire 22a may be made of a material such as silicone, etc. It will be appreciated that the outer circumference of the first guide wire 21a and the second guide wire 22a may also each be provided with a support structure, wherein the hardness of the support structure of the outer circumference of the second guide wire 22a should be smaller than the hardness of the support structure of the outer circumference of the first guide wire 21a, thereby enabling the design requirement that the hardness of the guide section 22 is smaller than the hardness of the support section 21.

In other embodiments, the first guide wire 21a and the second guide wire 22a may be separate structures, and in this design manner, the first guide wire 21a and the second guide wire 22a may be manufactured separately, then a support structure is disposed on the outer periphery of the first guide wire 21a, and finally the first guide wire 21a and the second guide wire 22a with the support structure are connected. The connection mode between the first guide wire 21a and the second guide wire 22a may be bonding, welding, braiding or connecting through a buckle, and the like, so that the connection mode between the first guide wire 21a and the second guide wire 22a is not limited, and only needs to meet the connection strength requirement. Wherein, the buckle can adopt the form of pin and box to increase the convenience of first guide wire 21a and second guide wire 22a dismouting, it can be understood that the joint strength between pin and box should satisfy the user demand of seeker 2, avoids first guide wire 21a and second guide wire 22a to break away from in the use.

The support structure of the present application may be a spring coil 21b provided at the outer circumference of the first guide wire 21a, the spring coil 21b being formed by winding a wire with a proper hardness around the outer circumference of the first guide wire 21 a. Further preferably, the spring ring 21b may be made of stainless steel or titanium-nickel alloy, etc., to ensure that the spring ring 21b provides sufficient rigidity to the support section 21, while ensuring safe use of the spring ring 21 b.

Wherein the spring ring 21b may be directly disposed at the outer circumference of the first guide wire 21a to increase the convenience of the installation of the spring ring 21 b. In this design, the spring ring 21b may be formed by winding a spring wire around the outer periphery of the first guide wire 21a, so as to increase the adhesion effect between the spring ring 21b and the first guide wire 21a, and avoid the phenomenon of relative movement between the spring ring 21b and the first guide wire 21 a. Of course, after the spring ring 21b is prepared, the finished spring ring 21b may be sleeved on the outer periphery of the first guide wire 21a, so as to increase the convenience of installation. Alternatively, the spring ring 21b may be installed in the manufacturing mold of the first guide wire 21a during the manufacturing process of the first guide wire 21a, so that the spring ring 21b is inserted into the first guide wire 21a, thereby increasing the positioning accuracy and the installation firmness of the spring ring 21 b.

It can be seen that the setting position and setting manner of the spring ring 21b are not limited, and only the hardness requirement of the first guide wire 21a needs to be met.

It will be appreciated that the support structure may be other structures disposed on the outer periphery of the first guide wire 21a, as long as it is ensured that the support structure is capable of increasing the strength requirements of the first guide wire 21 a.

As another possible embodiment, the supporting section 21 and the guiding section 22 of the seeker 2 are made of the same material, and in this case, the diameter of the supporting section 21 is larger than that of the guiding section 22, so that the hardness of the supporting section 21 is larger than that of the guiding section 22. Under this kind of design mode, the material of first guide wire 21a is the same with second guide wire 22a, increases the convenience of seeker 2 manufacturing, and first guide wire 21a and second guide wire 22a can integrated into one piece, and the uniformity is good, convenient manufacturing. In addition, the connection position of the first guide wire 21a and the second guide wire 22a should be smoothly transited, so that flexible contact between the connection position of the first guide wire 21a and the second guide wire 22a and the inner wall of the blood vessel is ensured, and damage to the inner wall of the blood vessel is avoided.

As another possible embodiment, the supporting section 21 and the guiding section 22 of the seeker 2 are made of different materials, specifically, the guiding section 22 is made of a flexible material, and the supporting section 21 is made of a hard material, so that the hardness of the supporting section 21 is greater than that of the guiding section 22, and the seeker 2 can safely pass through a blood vessel, and meanwhile, damage to the blood vessel is avoided or reduced. Under this kind of design mode, because the material of support section 21 is different with guide section 22, at this moment, accessible establishment or through structure assembly such as buckle between support section 21 and the guide section 22 to satisfy the joint strength demand. Wherein, the buckle can adopt the form of pin and box to increase the convenience of support section 21 and guide section 22 dismouting, it can be understood that the joint strength between pin and box should satisfy the user demand of seeker 2, avoids support section 21 and guide section 22 to break away from in the use.

It can be seen that the different hardness implementations of the support section 21 and the guide section 22 of the present application are not limited, and only need to meet the hardness and strength requirements.

As shown in fig. 1 and 2, the end of the guiding section 22 is provided with a guiding surface, and the guiding surface can protect the blood vessel and avoid damaging the blood vessel. Specifically, the guiding surface is an arc surface of the guiding section 22, which smoothly transitions with the outer peripheral surface of the end of the guiding section 22 away from the supporting section 21, so that the end of the guiding section 22 away from the supporting section 21 is arc-shaped. The design mode enables the surface of the seeker 2, which is preferentially contacted with the blood vessel, to be the cambered surface, so that the seeker 2 can walk in the blood without damaging the wall of the blood vessel, and the cambered surface is convenient for guiding after the seeker 2 contacts with the bent position of the blood vessel, so that the seeker 2 can drive the conveying pipe 11 to pass in the blood vessel.

In some embodiments, as shown in connection with fig. 1, 2 and 4, the guiding section 22 extends along an arc-shaped path, i.e. the guiding section 22 is in the shape of a hook, and the free end of the guiding section 22 deviates from the supporting section 21 by a certain angle, for example, the included angle between the line connecting the two ends of the guiding section 22 and the axis of the supporting section 21 is greater than or equal to 30 degrees, for example, the included angle between the line connecting the two ends of the guiding section 22 and the axis of the supporting section 21 is 30 °, 35 °, 40 °, 45 °, 50 °, 55 °, 60 °, 65 °, 70 °, so that the guiding head 2 can perform the selection of different blood vessels at the bifurcation of the blood vessels.

In particular, during the endovascular navigation of the introducer 2, when navigating in a relatively straight vessel, the guide section 22 is deformable under the constraints of the vessel by virtue of its flexible material, so that the curved guide section 22 is able to navigate in the relatively straight vessel. When encountering the vascular branch, accessible rotates conveyer pipe 1, and then drives the seeker 2 through conveyer pipe 1 and rotate, and then makes the tip of the bending of guide section 22 towards the target vascular branch, carries out the progressive motion of conveyer pipe 1 again, and then makes guide section 22 can enter into the target vascular branch, increases the convenience of operation.

In other embodiments, the guiding section 22 extends along an arc-shaped path, and one end of the guiding section 22 far away from the supporting section 21 is bent, or a plurality of bending points are provided on the guiding section 22, so that the extending path of the guiding section 22 is not regular arc-shaped, and the guiding section 22 can adapt to the use requirements of different scenes.

It can be seen that the extension of the guide section 22 of the present application is not limited, and can be designed according to the actual use requirement and use situation.

The outlet 13 may be provided at any suitable location of the delivery tube 1, for example, the outlet 13 may be provided at a location of the delivery tube 1 close to the guide head.

As shown in fig. 1 to 4, the delivery pipe 1 includes a delivery section 11 and a liquid outlet section 12 connected to one end of the delivery section 11, a delivery passage 14 is formed in the delivery section 11 and the liquid outlet section 12, the liquid outlet section 12 connects the delivery section 11 and the introducer 2 (specifically, may be a support section 21 of the introducer 2), and a liquid outlet 13 is provided on a peripheral wall of the liquid outlet section 12. In this design, the liquid such as contrast agent flows into the conveying passage 14 inside the conveying section 11 and the liquid outlet section 12 through the liquid inlet, and flows out to the designated position through the liquid outlet 13 on the peripheral wall of the liquid outlet section 12. The liquid outlet 13 is arranged at the rear end of the guide head 2 and at the front end of the conveying pipe 1, so that the guide head 2 can drive the conveying pipe 1 to pass in a blood vessel, and then the liquid outlet 13 can reach a target position under the guide of the guide head 2.

In other embodiments, the liquid outlet 13 may be provided at the top of the conveying section 11, i.e. at a location of the conveying section 11 near the liquid outlet section 12.

In addition, the low-pressure perfusion physiological saline is connected to the liquid inlet of the delivery tube 1, and when the contrast catheter is fed in the blood vessel, the flowing physiological saline flows along the axial direction of the delivery tube 1 so as to ensure that the blood does not flow into or flows into the contrast catheter in a small amount during the feeding process of the contrast catheter.

In some embodiments, the hardness of the conveying section 11 and the liquid outlet section 12 are the same, at this time, the conveying section 11 and the liquid outlet section 12 may be made of the same material, and the liquid outlet section 12 and the conveying section 11 may be integrally formed, so as to increase the convenience and structural strength of the manufacturing of the conveying pipe 1, avoid the separation of the conveying pipe 1 at the connection position of the liquid outlet section 12 and the conveying section 11, and ensure the use safety. In this design, the whole conveying pipe 1 plays a supporting role.

In the present application, the hardness of the seeker 2 is smaller than that of the transfer tube 1, meaning that the overall hardness of the seeker 2 is smaller than that of the transfer tube 1, and when the seeker 2 includes the support section 21 and the guide section 22 and the transfer tube 1 includes the transfer section 11 and the liquid outlet section 12, the hardness of the hardest part of the seeker 2 is still smaller than that of the softest part of the transfer tube 1.

In other embodiments, the hardness of the outfeed section 12 is less than the hardness of the delivery section 11. The hardness of the liquid outlet section 12 is greater than that of the guide head, so that under the design mode, the hardness of the supporting section 21 is between that of the conveying section 11 and that of the guide head 2, so that the hardness of each position of the contrast catheter meets the design requirement, the guide head 2 can conveniently and better drive the conveying pipe 1 to pass through the blood vessel, and simultaneously, the torsion control requirement of the contrast catheter is met, so that the whole contrast catheter can synchronously move or synchronously rotate. At this time, the material of the liquid outlet section 12 may be the same as or different from the material of the conveying section 11.

When the material of the liquid outlet section 12 is the same as that of the conveying section 11, a reinforcing structure, such as a spring wire, can be arranged on the periphery of the conveying section 11 to increase the hardness of the conveying section 11, so as to meet the design requirement that the hardness of the liquid outlet section 12 is smaller than that of the conveying section 11. Under this kind of design mode, go out liquid section 12 and carry section 11 can integrated into one piece to increase convenience and the structural strength that conveyer pipe 1 was made, avoid conveyer pipe 1 to go out liquid section 12 and carry section 11 junction separation, ensure the security of using.

Wherein the spring wire may be directly disposed at the outer circumference of the conveying section 11 to increase the convenience of spring wire installation. Under this kind of design mode, the spring silk can be formed by the mode of spring silk winding at the periphery of carrying section 11 to increase the laminating effect of spring silk and carrying section 11, avoid appearing the phenomenon of relative movement between spring silk and the carrying section 11. Of course, after the spring wire is prepared, the finished spring wire can be sleeved on the periphery of the conveying section 11, so that the convenience of installation is improved. Or, the spring wire can be installed in the manufacturing die of the conveying section 11 in the manufacturing process of the conveying section 11, so that the spring wire is penetrated in the conveying section 11, and the positioning accuracy and the installation firmness of the spring wire are improved.

It can be understood that the liquid outlet section 12 and the conveying section 11 may be designed separately, i.e. the liquid outlet section 12 and the conveying section 11 are processed separately, and then the processed liquid outlet section 12 and conveying section 11 are connected together by adopting structures such as bonding, welding, braiding or fastening. Wherein, the buckle can adopt the form of pin thread and box to increase the convenience of play liquid section 12 and transport section 11 dismouting, it can be understood that the joint strength between pin thread and the box should satisfy the user demand of conveyer pipe 1, avoids play liquid section 12 and transport section 11 to break away from in the use.

When the material of the liquid outlet section 12 is different from the material of the conveying section 11, the material hardness of the liquid outlet section 12 should be less than the material hardness of the conveying section 11, at this time, the liquid outlet section 12 and the conveying section 11 can be made separately, and then the separately made conveying section 11 and the liquid outlet section 12 are connected together, wherein the liquid outlet section 12 and the conveying section 11 can be connected in a braiding, assembling and other modes so as to meet the requirement of the connection strength.

As a possible implementation manner, the hardness of the conveying section 11 is greater than that of the liquid outlet section 12, the hardness of the liquid outlet section 12 is greater than that of the supporting section 21, and the hardness of the supporting section 21 is greater than that of the guiding section 22, so that the conveying catheter is in a decreasing form along the conveying section 11 towards the guiding section 22, namely, the hardness is gradually softened along the direction from the conveying section 11 towards the guiding section 22, and further, the torsion force of the conveying section 11 can be transmitted to the guiding section 22 through the liquid outlet section 12 and the supporting section 21 in the rotating progressive process of the radiography catheter, so that kinking of the guide head 2 in the rotating progressive process of the radiography catheter is avoided, the torsion control of the radiography catheter is increased, and the rotating progressive requirement of the radiography catheter is met.

The radial dimension of the introducer head 2 of the application is smaller than the radial dimension of the delivery tube 1 so that the diameter of the introducer head 2 that preferentially contacts the blood vessel is smaller than the diameter of the delivery tube 1, facilitating the introducer head 2 to guide the delivery tube 1 through the blood vessel. The diameter of the delivery tube 1 is larger than that of the guide head 2, and the delivery tube 1 can accommodate more contrast medium, so that a large amount of contrast medium can be conveniently injected into a blood vessel through the delivery channel 14 in the delivery tube 1.

As a possible implementation manner, the radial dimension of the seeker 2 is smaller than the radial dimension of the conveying section 11, the liquid outlet section 12 is a conical tube, so that the seeker 11 and the conveying section 11 are conveniently connected, the liquid outlet section 12 is a conical tube, the conical surface has enough surface area, the liquid outlet is conveniently arranged on the liquid outlet section 12, the diameter of the liquid outlet section 12 along the conveying section 11 towards the direction of the seeker 2 is gradually reduced, so that the diameter of one end of the liquid outlet section 12 connected with the seeker 2 is smaller than the diameter of one end of the liquid outlet section 12 connected with the conveying tube 1, the diameter of the seeker 2 which is preferentially contacted with a blood vessel is the same as the diameter of one end of the liquid outlet section 12 connected with the seeker 2, so that the whole of the radiography catheter is in a head-tail large structure, and the seeker 2 is ensured to drive the conveying tube 1 to pass in the blood vessel. The conical tube is arranged in such a way that more liquid outlets 13 can be arranged, so that a large amount of liquid such as contrast agent can flow out to meet the contrast requirement.

As shown in connection with fig. 2 and 5, in some embodiments, the section of the tapping section 12 may be trapezoidal in shape to provide a transition for the transport of the delivery pipe 1 through the tapping section 12. In addition, in other embodiments, the cross-section of the liquid outlet section 12 may be waist-shaped, so that the liquid outlet section 12 adopts an arc transition manner, and the smoothness of the guide head 2 passing through the blood vessel is increased. It can be seen that the arrangement of the liquid outlet section 12 is not limited, and it is only necessary to ensure that the diameter of the liquid outlet section 12 gradually decreases along the conveying section 11 toward the guide head 2.

Further optimally, the joints of the liquid outlet section 12, the conveying section 11 and the guide head 2 are respectively connected by smooth curved surfaces. The design mode enables the installation position of the liquid outlet 13 to be designed in a smooth curve, so that the connection part of the liquid outlet section 12, the conveying section 11 and the guide head 2 is in smooth contact with the wall of the blood vessel, the influence of the connection position of the liquid outlet section 12 and the conveying pipe 1 on the blood vessel is reduced or avoided, and the blood vessel can be effectively protected from being damaged.

In another embodiment, the delivery tube 1 and the seeker 2 of the present application are integrally formed, and at this time, the materials of the delivery tube 1 and the seeker 2 may be the same, so as to increase the convenience of manufacturing the contrast catheter, and at the same time, ensure the connection strength of the delivery tube 1 and the seeker 2, avoid the separation of the connection position of the delivery tube 1 and the seeker 2, and ensure the use safety of the contrast catheter.

At this time, in order to achieve the difference in hardness, reinforcing structures may be provided at the outer circumferences of the transfer tube 1 and the seeker 2 to change the structural hardness of the transfer tube 1 and the seeker 2 by the reinforcing structures. For example, the reinforcing structure may be a reinforcing coil, that is, a reinforcing coil is disposed at the outer periphery of the delivery tube 1 and the guide head 2, and the reinforcing coil is relatively dense at a position where the hardness requirement is high, and the reinforcing coil is relatively loose at a position where the hardness requirement is low, so as to realize different hardness at each position of the contrast catheter, that is, the contrast catheter may realize gradual hardness change by the dense degree of the reinforcing coil disposed at the outer periphery thereof. Preferably, the reinforcing coil may be formed in such a manner that the spring wire is wound around the outer circumferences of the delivery tube 1 and the guide head 2, so as to enhance the control of the density of the coil.

In other embodiments, reinforcing coils of different hardness may be provided at different locations on the outer circumference of the delivery tube 1 and the introducer head 2 to meet the different hardness requirements at each location of the contrast catheter by providing reinforcing coils of different hardness.

The plurality of liquid outlets 13 are uniformly arranged along the circumferential direction of the conveying pipe 1, and the plurality of liquid outlets 13 realize smooth passing of high-speed and large-capacity contrast agents, increase contrast development effect and facilitate a large amount of contrast agents to flow out of the contrast guide pipe rapidly. And the plurality of liquid outlets 13 are uniformly arranged, so that liquid can be uniformly discharged in the circumferential direction of the conveying pipe 1. Referring to fig. 1 to 5, a plurality of liquid outlets 13 are disposed on the liquid outlet section 12, and the liquid outlets 13 are disposed on the outer periphery of the liquid outlet section 12 in such a design manner, so that the orientation of the liquid outlets 13 is convenient to set. Furthermore, a plurality of liquid outlets 13 may also be provided at the periphery of the delivery pipe 1 at a position close to the liquid outlet section 12; or the liquid outlet section 12 and the periphery of the conveying pipe 1 are respectively provided with a plurality of liquid outlets 13, and the design can be carried out according to specific requirements. It can be seen that the arrangement mode of the liquid outlet 13 is not limited, and the arrangement position of the liquid outlet 13 can meet the contrast requirement as long as the conveying pipe 1 is ensured to move in place.

As shown in fig. 3, the liquid outlet direction of the liquid outlet 13 is configured to be consistent with the flowing direction of blood in blood vessels (see the direction of arrow), so as to reduce the impact on the blood vessels after the contrast agent flows out, effectively protect the blood vessels from being damaged, realize the smooth passing of high-speed and large-capacity contrast agent, and increase the contrast developing effect. It will be appreciated that the outlet direction of the outlet 13 may also be at a small angle to the direction of blood flow.

In some embodiments, as shown in fig. 3, the number of the liquid outlets 13 is plural, the plurality of liquid outlets 13 are arranged at intervals along the circumferential direction of the liquid outlet section 12, and the extending direction of the axes of the plurality of liquid outlets 13 is parallel to the extending direction of the conveying pipe 1 (the extending direction of the conveying section 11 and the extending direction of the liquid outlet section 12), so that the flowing direction of the liquid such as the contrast agent is consistent with the flowing direction of the blood, thereby realizing safe contrast of a large amount of contrast agent, and not affecting the contrast result.

In other embodiments, the liquid outlets 13 are divided into multiple groups (or multiple layers), the multiple groups of liquid outlet 13 are arranged at intervals along the extending direction of the liquid outlet section 12, each group of liquid outlet 13 comprises multiple liquid outlets 13, and the multiple liquid outlets 13 are arranged at intervals along the circumferential direction of the liquid outlet section 12.

As shown in fig. 3, the liquid outlet 13 of the present application is a liquid outlet channel, that is, the liquid outlet 13 has a certain depth (or thickness, as shown in fig. 3), and the liquid outlet direction of the liquid outlet channel is parallel to the liquid delivery direction of the delivery tube 1. The infusion direction of the delivery tube 1 (or the extending direction of the delivery tube 1) is parallel to the blood flowing direction, and the liquid outlet direction of the liquid outlet channel is the extending direction of the liquid outlet channel. When the liquid such as the contrast agent can flow to the liquid outlet 13 along the extending direction of the liquid outlet channel, the liquid outlet channel guides the outflow of the liquid such as the contrast agent, and the contrast agent is caused to flow out in a direction coincident with the depth direction of the liquid outlet channel, that is, the blood flow. On one hand, the embodiment can realize that the flowing direction of the liquid such as the contrast agent is consistent with the blood flow direction, and is convenient for large-dose ejection of the liquid such as the contrast agent; on the other hand, the liquid such as the contrast agent is not perpendicular to the blood vessel wall, so that the impact on the blood vessel wall is avoided, and the blood vessel wall is not easily damaged.

As a possible implementation manner, specifically, since the liquid outlet section 12 is a conical tube, the liquid outlet direction of the liquid outlet 13 is consistent with the conveying direction of the conveying tube (that is, the conveying direction of the conveying section 11), that is, the depth direction of the liquid outlet 13 (liquid outlet direction) is not perpendicular to the conical surface of the conical tube, so that the depth of the liquid outlet 13 forms a certain angle with the wall thickness direction of the liquid outlet section 12, so that the depth of the liquid outlet 13 is greater than the wall thickness of the liquid outlet section 12, and when the wall thickness of the liquid outlet section 12 is thicker, the depth of the liquid outlet 13 is deeper, and the guiding effect on the liquid such as the contrast agent is stronger.

Further, when the liquid outlet section 12 is a conical tube, the taper of the conical tube is smaller than 30 °, that is, the conical tube tends to be flat, so that when the liquid outlet section 12 is provided with the liquid outlet 13, the liquid outlet direction of the liquid outlet 13 can be more easily aligned with the conveying direction of the conveying tube 1.

In other embodiments of the present invention, the depth direction (liquid outlet direction) of the liquid outlet 13 may be perpendicular to the conical surface of the conical tube.

As a possible embodiment, the delivery pipe 1 includes a delivery section 11 and a liquid outlet section 12 connected to one end of the delivery section 11, at this time, the liquid outlet channels are uniformly provided on the peripheral wall of the liquid outlet section 12 along the circumferential direction of the liquid outlet section 12, and one end of the liquid outlet channels communicates with the delivery channel 14 so that the liquid such as the contrast agent in the delivery channel 14 can flow out through the liquid outlet channels. The extending direction of the liquid outlet channel is consistent with the extending direction of the conveying section 11, so that the liquid such as the contrast agent in the liquid outlet channel 14 can flow out through the liquid outlet channel, and the flowing direction of the liquid such as the contrast agent flowing out through the liquid outlet channel is consistent with the flowing direction of the blood in the blood vessel.

In this embodiment, the guiding section 22 may be made of silica gel, teflon, etc. with excellent flexibility, and the supporting section 21 may be made of a combination of nonmetallic filler and metallic support, such as a stainless steel thread coil wrapped around the inner liner of the silica gel tube. The liquid outlet section 21 can be a composite material braided fabric or a single composite material integrally formed material, and has the characteristics of good toughness and strong torsion control.

Preferably, the conveying section 11 and the discharge section 12 are integrally formed. Preferably, the support section 21 and the guide section 22 are integrally formed. More preferably, the conveying section 11, the liquid outlet section 12, the supporting section 21 and the guiding section 22 are integrally formed, so that the integrity of the radiography catheter can be improved, the integrity is good when the radiography catheter performs linear and rotary motion in a blood vessel, and the guiding head can sensitively follow the conveying section 11 to perform corresponding motion when the tail part of the conveying section 11 is driven to act. Specifically, the four may be integrally connected to each other by coating the outer circumferences of the conveying section 11, the liquid outlet section 12, the supporting section 21, and the guiding section 22, or may be integrally connected to each other by other suitable means.

Furthermore, the outer wall surface of the contrast catheter is coated with a first hydrophilic coating; and/or the inner wall surface of the contrast catheter is coated with a second hydrophilic coating. I.e. only the outer wall surface of the contrast catheter is coated with a first hydrophilic coating; or only the inner wall surface of the radiography conduit is coated with a second hydrophilic coating; or a first hydrophilic coating is coated on the outer wall surface of the contrast catheter, while a second hydrophilic coating is coated on the inner wall surface of the contrast catheter. The design mode realizes the consistency of the inner surface and the outer surface of the contrast catheter on the one hand, the friction coefficient of the contrast catheter in the blood vessel can be greatly reduced, the push performance of the contrast catheter is stronger, and on the other hand, the liquid such as contrast agent and the like can flow in the conveying channel 14 more smoothly. In addition, the first hydrophilic coating and the second hydrophilic coating can enable the overall structure of the contrast catheter to be more compact, and the torsion control performance of the contrast catheter is enhanced.

It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The foregoing is only a specific embodiment of the invention to enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown and described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A contrast catheter, comprising:

a conveying channel (14) is arranged in the conveying pipe (1), and a liquid outlet (13) communicated with the conveying channel (14) is arranged on the periphery of the end part of the conveying pipe (1);

the guide head (2) with a closed outer surface is arranged at one end of the conveying pipe (1) provided with the liquid outlet (13), and the guide head (2) is configured to guide the conveying pipe (1) to pass through a blood vessel.

2. The contrast catheter of claim 1, wherein the hardness of the introducer (2) is less than the hardness of the delivery tube (1).

3. The contrast catheter according to claim 1, characterized in that the introducer (2) comprises a support section (21) connected to the delivery tube (1) and a guide section (22) arranged at the end of the support section (21), the guide section (22) having a hardness smaller than the hardness of the support section (21).

4. A catheter as claimed in claim 3, wherein the support section (21) comprises a first guide wire (21 a) and a support structure wound around the first guide wire (21 a), the guide section (22) comprising a second guide wire (22 a), the first guide wire (21 a) and the second guide wire (22 a) being integrally formed.

5. The contrast catheter according to claim 1, wherein the delivery tube (1) comprises a delivery section (11) and a discharge section (12) connected to one end of the delivery section (11), the delivery channel (14) being formed in the delivery section (11) and the discharge section (12), the discharge opening (13) being provided on a peripheral wall of the discharge section (12).

6. The contrast catheter of claim 5, wherein the exit section (12) has a hardness less than the delivery section (11); and/or

The liquid outlet section (12) and the conveying section (11) are integrally formed.

7. The contrast catheter of claim 5, wherein the radial dimension of the introducer (2) is smaller than the radial dimension of the delivery segment (11), the exit segment (12) is a conical tube, and the exit segment (12) gradually decreases in diameter along the delivery segment (11) toward the introducer (2);

the connection parts of the liquid outlet section (12) and the conveying section (11) and the guide head (2) are respectively in smooth curved surface connection.

8. The catheter according to any of claims 1-7, wherein the plurality of liquid outlets (13) is provided in a plurality, the plurality of liquid outlets (13) being evenly arranged along the circumferential direction of the delivery tube (1).

9. The catheter according to any of claims 1-7, wherein the outlet (13) is an outlet channel, the outlet direction of which is parallel to the infusion direction of the delivery tube (1).

10. The contrast catheter of any of claims 1-7, wherein the introducer (2) is of solid construction.