CN118320267A

CN118320267A - Vascular intervention catheter

Info

Publication number: CN118320267A
Application number: CN202410752375.7A
Authority: CN
Inventors: 荆洪娟; 付平; 黄嘉平
Original assignee: Hangzhou Yike Medical Technology Co ltd
Current assignee: Hangzhou Yike Medical Technology Co ltd
Priority date: 2024-06-12
Filing date: 2024-06-12
Publication date: 2024-07-12
Anticipated expiration: 2044-06-12
Also published as: CN118320267B

Abstract

The invention discloses a vascular interventional catheter, which comprises a main catheter and an auxiliary catheter, wherein the auxiliary catheter is detachably connected with the main catheter and is allowed to switch between a connection state and a separation state, the auxiliary catheter is in the connection state in the process that the catheter is configured to be conveyed into a blood vessel, the proximal end of the auxiliary catheter is formed into a fixed end and is fixedly connected with the proximal end of the main catheter relatively, the distal end of the auxiliary catheter is formed into a free end and extends out of the distal end of the main catheter, the distal end of the auxiliary catheter automatically contracts towards the distal end of the main catheter after contacting the inner wall of the blood vessel to slide over the inner wall of the blood vessel so as to conform to the blood vessel, and the auxiliary catheter is restored to be in the original state after sliding over the inner wall of the blood vessel to release stress, so that the catheter quickly passes through the blood vessel, and after the catheter is configured to be conveyed into the blood vessel in place, the auxiliary catheter is switched to the separation state so as to be separated from the main catheter. The catheter of the invention can effectively pass through a tortuous vascular path, and simultaneously, the damage to the blood vessel is reduced to the greatest extent.

Description

Vascular intervention catheter

Technical Field

The invention relates to the technical field of medical instruments, in particular to a vascular interventional catheter.

Background

Vascular interventional catheters are an integral medical device in interventional procedures that are delivered into a blood vessel and accurately guided to a target site, opening a path for diagnostic or therapeutic procedures, such as delivering other devices or aspirating thrombi.

In order to facilitate the catheter to conform to the blood vessel and reach a far target position, chinese patent No. CN219307676U proposes a reducing catheter, in which the distal end of the catheter is configured as a reducing tube, so that the distal end of the catheter can adapt to the bending of the blood vessel. However, this reduced diameter configuration, while enhancing the ability to pass through complex blood vessels, also presents problems: the reduced distal lumen diameter may prevent smooth delivery of subsequent therapeutic devices or reduce thrombus aspiration efficiency and may cause injury to the delicate vessel inner wall due to the distal configuration.

Aiming at the technical challenges, the Chinese patent No. 109908453A adds a pushing tube on the basis of the original catheter, overcomes the pushing difficulty caused by vascular tortuosity by utilizing the distal auxiliary catheter of the pushing tube, and guides a guide wire into a guide wire channel through a guide wire inlet at the distal end of the pushing tube in advance, and then pushes the pushing tube into the catheter and stretches out of the distal end of the catheter so as to guide the catheter to smoothly pass through a tortuous vessel. Although this design both preserves the original form of the catheter and improves the passage performance of the catheter, direct hard contact of the distal end of the push tube with the vessel wall may still result in vessel damage, failing to completely eliminate the safety hazard in operation.

Disclosure of Invention

The invention aims to solve the technical problem that the prior art has the defects and provides a vascular interventional catheter.

According to the present invention, there is provided a vascular interventional catheter comprising a main catheter and a subsidiary catheter, the subsidiary catheter being detachably connected to the main catheter and being allowed to switch between a connected state and a disconnected state, the subsidiary catheter being in the connected state during the catheter being configured to be delivered into a blood vessel, the proximal end of the subsidiary catheter being formed as a fixed end and being fixedly connected relative to the proximal end of the main catheter, the distal end of the subsidiary catheter being formed as a free end and extending beyond the distal end of the main catheter, the distal end of the subsidiary catheter being self-retracted towards the distal end of the main catheter to slide over the inner wall of the blood vessel to conform to the blood vessel after contacting the inner wall of the blood vessel and returning to its original state after being slid over the inner wall of the blood vessel to release stress, so that the catheter is quickly passed through the blood vessel, the subsidiary catheter being switched to the disconnected state to be separated from the main catheter after being configured to be delivered into the blood vessel.

Further, the auxiliary guide tube comprises a fixing section, a deformation section and a guide section which are sequentially connected from the proximal end to the distal end, wherein the deformation section is used for deforming after the guide section contacts the inner wall of a blood vessel so as to allow the guide section to retract to the distal end of the main guide tube, and recovering the deformation after the guide section slides across the inner wall of the blood vessel so as to drive the guide section to recover.

Further, the deformation section is positioned in the main conduit and has toughness greater than that of the fixed section and the guide section.

Further, the guide section is partially located within the main conduit.

Further, the guide section comprises a cylindrical section and a conical section which are sequentially connected from the proximal end to the distal end, and the cylindrical section is partially positioned in the main catheter.

Further, the deformation section is of a spiral structure.

Further, the deformation section comprises a support tube and a helical blade arranged around the support tube, the helical blade is connected between the fixed section and the guide section, and the support tube at least extends to the guide section and is communicated with the inside of the guide section to form a guide wire cavity for a guide wire to pass through.

Further, the spiral blade is formed in a shape having both large ends and small middle.

Further, the proximal end of the support tube is arranged in a suspended manner and is spaced from the distal end of the fixed section, and the distal end of the support tube is fixedly connected with the proximal end of the guide section.

Further, the proximal end of the support tube is connected with the distal end of the fixed section, and the distal end of the support tube is fixedly connected with the proximal end of the guide section.

Compared with the prior art, the catheter is additionally provided with the auxiliary catheter on the basis of the main catheter, and the auxiliary catheter automatically and conformably contracts towards the main catheter at the moment of contacting with the inner wall of the blood vessel, so that the catheter can more smoothly slide through the tortuous area of the blood vessel, physical compression and potential damage to the fragile blood vessel wall are obviously reduced, and the catheter quickly returns to the original shape after the auxiliary catheter finishes the action of sliding through the inner wall of the blood vessel to release the stress generated by deformation, thereby ensuring the continuous and effective guiding performance of the catheter in the whole interventional treatment process. Therefore, the catheter of the present invention can effectively pass through a tortuous vascular path while minimizing damage to the blood vessel.

Drawings

The invention will be more fully understood and its attendant advantages and features will be more readily understood by reference to the following detailed description, taken in conjunction with the accompanying drawings.

Fig. 1 is a schematic overall structure of a first embodiment of the present invention.

FIG. 2 is a cross-sectional view taken at A-A in FIG. 1.

Fig. 3 is a schematic view of the structure of the auxiliary duct in fig. 1.

Fig. 4 is an enlarged view at B in fig. 3.

Fig. 5 is a schematic structural diagram of an auxiliary conduit in the second embodiment of the present invention.

Fig. 6 is a schematic structural diagram of an auxiliary conduit in a third embodiment of the present invention.

Fig. 7 is a schematic view of the partial structure of fig. 6.

In the accompanying drawings: 100 is a main conduit, 101 is a main conduit base, and 102 is a main conduit base; 200 is an auxiliary catheter, 201 is an auxiliary catheter seat, 202 is a fixed section, 203 is a deformation section, 2031 is a supporting tube, 2032 is a helical blade, 204 is a guiding section, 2041 is a cylindrical section, and 2042 is a conical section.

It should be noted that the drawings are for illustrating the invention and are not to be construed as limiting the invention. Note that the drawings representing structures may not be drawn to scale. Also, in the drawings, the same or similar elements are denoted by the same or similar reference numerals.

Detailed Description

In order that the invention may be more readily understood, a detailed description of the invention is provided below along with specific embodiments and accompanying figures.

The terms "proximal" and "distal" in the sense of the present invention should be understood as meaning, viewed from the direction of the attending physician, the term "proximal" referring to the end proximal to the attending physician, i.e. corresponding to the "left end" referred to with reference to the accompanying drawings, and the term "distal" referring to the end distal to the attending physician, i.e. corresponding to the "right end" referred to with reference to the accompanying drawings.

Embodiment one: as shown in fig. 1 to 4, the vascular access catheter of the present embodiment includes a main catheter 100 and an auxiliary catheter 200, the auxiliary catheter 200 being detachably connected to the main catheter 100 and being allowed to switch between a connected state and a disconnected state. Essentially, the present embodiment adds the auxiliary catheter 200 on the basis of the conventional catheter, i.e., the main catheter 100, to allow the original form of the main catheter 100 to be maintained, and improves the passing performance of the entire catheter through the auxiliary catheter 200 while minimizing damage to the blood vessel.

The catheter of this embodiment is configured to be delivered into a blood vessel, the auxiliary catheter 200 is in a connection state, at this time, the auxiliary catheter 200 is sleeved in the main catheter 100, the proximal end of the auxiliary catheter 200 is formed as a fixed end and is relatively and fixedly connected with the proximal end of the main catheter 100, the distal end of the auxiliary catheter 200 is formed as a free end and extends out of the distal end of the main catheter 100, the distal end of the auxiliary catheter 200 is tapered, the distal end of the auxiliary catheter 200 automatically contracts toward the distal end of the main catheter 100 after contacting the inner wall of the blood vessel to slide over the inner wall of the blood vessel to conform to the blood vessel, and returns to the original state after sliding over the inner wall of the blood vessel to release stress, so that the catheter of this embodiment can quickly pass through the blood vessel. Since the auxiliary catheter 200 of the embodiment automatically and conformably contracts toward the main catheter 100 at the moment of contact with the inner wall of the blood vessel, the catheter can more smoothly slide through the tortuous region of the blood vessel, physical compression and potential damage to the wall of the fragile blood vessel are also remarkably reduced, and after the auxiliary catheter 200 finishes the action of sliding through the inner wall of the blood vessel and releases the stress generated by deformation, the auxiliary catheter quickly returns to the original shape, thereby ensuring the continuous and effective guiding performance of the catheter in the whole interventional treatment process.

After the catheter of the present embodiment is configured to be delivered to a vessel in place, the auxiliary catheter 200 is switched to a detached state to be detached from the main catheter 100 without affecting the subsequent interventional procedure. That is, the catheter 200 is timely detached after completing its mission of assisting in passing through the complex vascular path, avoiding unnecessary occupation or interference to the blood vessel in the subsequent treatment, thereby further reducing the burden and potential injury to the vascular wall. This separation strategy, in combination with the above-described automated compliant contractile function of the auxiliary catheter 200, together form a highly coordinated and highly protective interventional catheter system that not only improves the smoothness and accuracy of the surgical procedure, but also maximally protects the vascular health of the patient. Thus, the catheter of the present embodiment is capable of effectively passing through tortuous vascular pathways while minimizing damage to the blood vessels.

The main catheter 100 comprises a main catheter hub 101 and a main catheter segment 102 connected in sequence from the proximal end to the distal end. The auxiliary catheter 200 comprises an auxiliary catheter seat 201, a fixing section 202, a deformation section 203 and a guiding section 204 which are sequentially connected from the proximal end to the distal end, wherein a gap between the fixing section 202 and the main catheter seat 101 is smaller, and the fixing section 202 and the main catheter seat 101 can be relatively spliced and fixed, so that the relatively fixed connection between the proximal end of the auxiliary catheter 200 and the proximal end of the main catheter 100 is realized. When the auxiliary catheter 200 is in the connected state, the auxiliary catheter seat 201 is positioned in the proximal direction of the main catheter seat 101, the fixed section 202 is positioned in the main catheter seat 101 and the main catheter section 102 basically completely, the deformation section 203 is positioned in the main catheter section 102 and has higher toughness than the fixed section 202 and the guide section 204, the guide section 204 is positioned in the main catheter section 102 partially, and the guide section 204 extends out of the main catheter section 102 partially. Because the toughness of the deformation section 203 is greater than that of the fixing section 202 and the guiding section 204, when the guiding section 204 contacts the inner wall of the blood vessel, the deformation section 203 is deformed by the resistance of the inner wall of the blood vessel transmitted by the guiding section 204, namely, the deformation section 203 can effectively absorb and convert the resistance from the wall of the blood vessel, the deformation of the deformation section 203 can cause the guiding section 204 to retract, so that the deformation section can smoothly slide through the bent part of the blood vessel, the main catheter 100 can be caused to quickly pass through the blood vessel, the mechanism greatly reduces the friction and potential damage of the catheter and the wall of the blood vessel, and simultaneously, the advancing speed of the catheter is also accelerated. That is, the deformation section 203 deforms after the guide section 204 contacts the inner wall of the blood vessel to allow the guide section 204 to retract toward the distal end of the main catheter 100, i.e., the distal end of the main catheter section 102, and returns to the deformed state after the guide section 204 slides over the inner wall of the blood vessel to drive the guide section 204 to return to the original state, in preparation for the next detour through the blood vessel.

The deformed segment 203 is a helical structure, and the deformed segment 203 includes a support tube 2031 and helical blades 2032 disposed about the support tube 2031. The helical blade 2032 is designed to have a uniform pitch and uniform outer diameter, and the uniform design ensures stability and controllability in the deformation process, and meanwhile, the helical blade 2032 is connected between the fixed section 202 and the guide section 204, namely, the proximal end of the helical blade 2032 is fixedly connected with the distal end of the fixed section 202, and the distal end of the helical blade 2032 is fixedly connected with the proximal end of the guide section 204, so that the helical blade 2032 has stronger deformation performance so as to adapt to various complex trends in the blood vessel. The proximal end of the support tube 2031 is suspended and spaced from the distal end of the fixed section 202, and the distal end of the support tube 2031 is fixedly connected to the proximal end of the guide section 204 and communicates with the interior of the guide section 204 to form a guidewire lumen for the passage of a guidewire. The support tube 2031 of the embodiment extends only to the guide section 204, that is, only supports the portion of the spiral blade 2032 near the distal end direction, so that the purpose of the arrangement is that on one hand, the guide wire can smoothly penetrate to the auxiliary catheter seat 201 from the guide section 204 by means of the support tube 2031, so that the guide wire operation is more convenient, on the other hand, the rigid support is improved for the portion of the deformation section 203 near the guide section 204, the reaction force of the inner wall of the blood vessel to the guide section 204 is effectively transmitted, the guide section 204 is prevented from being excessively retracted to the distal end of the main catheter section 102 due to excessive deformation of the deformation section 203, and the damage to the inner wall of the blood vessel possibly caused by the distal end of the main catheter 100, that is, the distal end of the main catheter section 102, is effectively prevented, and the safety and the effectiveness of the interventional operation are ensured.

The guiding section 204 comprises a cylindrical section 2041 and a conical section 2042 which are sequentially connected from the proximal end to the distal end, the outer diameters of the cylindrical section 2041, the deformation section 203 and the fixing section 202 are the same, the manufacture is convenient, and the cylindrical section 2041 is partially positioned in the main catheter 100, namely, the cylindrical section 2041 is partially positioned outside the main catheter 100. In particular, for the conical section 2042, the portion of the cylindrical section 2041 exposed outside the main conduit 100 is a key point for guiding the conical section 2042 to retract smoothly or extend timely when necessary, and the conical section 2042 can flexibly adjust the position by relying on the outer portion of the cylindrical section 2041 as a fulcrum when passing through a narrow or tortuous vascular region during vascular intervention.

Embodiment two: unlike the first embodiment, in connection with the structure of the deformation section 203 shown in fig. 5, the support tube 2031 of the deformation section 203 of the embodiment further extends to the fixed section 202 to support all the spiral blades 2032, that is, the proximal end of the support tube 2031 is connected to the distal end of the fixed section 202, the distal end of the support tube 2031 is fixedly connected to the proximal end of the guide section 204, and the support tube 2031 is communicated with the fixed section 202 and the inside of the guide section 204 to form a continuous guide wire cavity, thereby ensuring the unobstructed passage of the guide wire from the guide section 204 to the auxiliary guide tube seat 201. The structure is relatively easy to manufacture, and the deformed segment 203 can be formed by cutting a spiral groove on a tubular structure.

Other structures of this embodiment are identical to those of the embodiment, and are not described herein.

Embodiment III: unlike the second embodiment, the helical blade 2032 of the embodiment has a shape with large ends and small middle, as shown in fig. 6 and 7, so that the deformed section 203 as a whole also has a similar shape with large ends and small middle. In this way, by changing the cross-sectional shape of the helical blade 2032, when the deformation section 203 is subjected to the resistance of the inner wall of the blood vessel, the deformation section 203 can generate the compliant deformation in the middle position of the deformation section 203 more intensively, but not uniformly distributed in the whole deformation area, so as to effectively control the retraction range of the guide section 204, and even if the bending or the large resistance is encountered in the blood vessel, the guide section 204 can be ensured not to be retracted to the far end of the main catheter 100, namely the far end of the main catheter section 102 excessively, thereby avoiding the potential damage to the inner wall of the blood vessel.

Other structures of this embodiment are the same as those of the second embodiment, and will not be described here again.

It will be appreciated that although the invention has been described above in terms of preferred embodiments, the above embodiments are not intended to limit the invention. Many possible variations and modifications of the disclosed technology can be made by anyone skilled in the art without departing from the scope of the technology, or the technology can be modified to be equivalent. Therefore, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A vascular interventional catheter comprising a main catheter (100) and a secondary catheter (200), the secondary catheter (200) being detachably connected to the main catheter (100) and being allowed to switch between a connected state and a disconnected state, the secondary catheter (200) being in the connected state during delivery of the catheter into a vessel, the proximal end of the secondary catheter (200) being formed as a fixed end and being fixedly connected relative to the proximal end of the main catheter (100), the distal end of the secondary catheter (200) being formed as a free end and extending beyond the distal end of the main catheter (100), the distal end of the secondary catheter (200) being adapted to slide over the distal end of the main catheter (100) against the vessel wall after contacting the vessel wall and to recover after being slid over the vessel wall to relieve stress such that the catheter passes rapidly through the vessel, the secondary catheter (200) switching to the disconnected state to be separated from the main catheter (100) after the catheter is configured to be delivered into place in the vessel.

2. The vessel interventional catheter according to claim 1, wherein the auxiliary catheter (200) comprises a fixed section (202), a deformation section (203) and a guiding section (204) connected in sequence from the proximal end to the distal end, the deformation section (203) being adapted to deform after the guiding section (204) contacts the inner wall of the vessel to allow the guiding section (204) to retract towards the distal end of the main catheter (100), and to resume the deformation after the guiding section (204) slides over the inner wall of the vessel to drive the guiding section (204) to return to its original shape.

3. The vascular interventional catheter according to claim 2, wherein the deformation section (203) is located within the main catheter (100) and has a larger toughness than the fixation section (202), the guiding section (204).

4. The vascular interventional catheter according to claim 2, wherein the guiding section (204) is partially located within the main catheter (100).

5. The vascular interventional catheter according to claim 4, wherein the guiding section (204) comprises a cylindrical section (2041) and a conical section (2042) connected in sequence from the proximal end to the distal end, the cylindrical section (2041) being partly located within the main catheter (100).

6. Vessel intervention catheter according to claim 2, wherein the deformation section (203) is of a helical structure.

7. The vascular interventional catheter according to claim 6, wherein the deformation section (203) comprises a support tube (2031) and a helical blade (2032) arranged around the support tube (2031), the helical blade (2032) being connected between the fixed section (202) and the guide section (204), the support tube (2031) extending at least to the guide section (204) and communicating with the interior of the guide section (204) to form a guidewire lumen for passage of a guidewire.

8. The vascular interventional catheter according to claim 7, wherein the spiral blade (2032) is formed in a shape with both large ends and small middle.

9. The vascular interventional catheter of claim 7, wherein the support tube (2031) is suspended at a distance from the distal end of the fixed section (202), and wherein the distal end of the support tube (2031) is fixedly connected to the proximal end of the guide section (204).

10. The vascular interventional catheter of claim 7, wherein the proximal end of the support tube (2031) is connected to the distal end of the fixed section (204), and the distal end of the support tube (2031) is fixedly connected to the proximal end of the guide section (204).