CN114470370B

CN114470370B - Suction catheter

Info

Publication number: CN114470370B
Application number: CN202210340195.9A
Authority: CN
Inventors: 郑殿会; 常新洋; 朱权威; 尤子超; 李广师; 董永贺; 李飞; 杜庆庆; 刘颖
Original assignee: Beijing Huamai Taike Medical Instrument Co ltd
Current assignee: Beijing Huamai Taike Medical Instrument Co ltd
Priority date: 2022-04-02
Filing date: 2022-04-02
Publication date: 2022-07-05
Anticipated expiration: 2042-04-02
Also published as: CN114470370A

Abstract

The invention provides an aspiration catheter, which relates to the technical field of thrombus medical equipment, and the tip assembly provided by the invention comprises: a head end pipe fitting, an elastic device and an end cap; the elastic device is arranged on the head end pipe fitting and connected with the end cap; the elastomeric device has a tendency to cover the end cap over the head end fitting. According to the suction catheter provided by the invention, when the guide wire is used, the end cap is pushed to deviate from the head end pipe fitting; when the guide wire is not used, the elastic device drives the end cap to cover the head end pipe fitting, so that the end pipe orifice of the head end pipe fitting can be plugged, and the suction catheter can normally suck thrombus.

Description

Suction catheter

Technical Field

The invention relates to the technical field of thrombus medical equipment, in particular to an aspiration catheter.

Background

Mechanical thrombectomy can rapidly remove thrombi, improve clinical symptoms, reduce the use of urokinase, and increase the safety of treatment. The prior mechanical thrombus aspiration operation needs to be guided by a guide wire, so the end head of the aspiration catheter is provided with a pipe orifice. However, the guide wire occupies the inner space of the suction catheter, which in turn causes the suction space of the suction catheter to be reduced. When guide wire guidance is not required, the orifice of the aspiration catheter needs to be blocked, otherwise thrombus aspiration will be affected.

Disclosure of Invention

The invention aims to provide a suction catheter to solve the technical problem that a nozzle of a head end pipe fitting is not blocked under the condition that a guide wire is not used.

In a first aspect, the present invention provides a tip assembly comprising: a head end pipe fitting, an elastic device and an end cap;

the elastic device is arranged on the head end pipe fitting and connected with the end cap;

the elastic means has a tendency to engage the end cap to the head end fitting.

With reference to the first aspect, the present invention provides a first possible implementation manner of the first aspect, wherein the elastic device includes: the first connecting ring, the second connecting ring and the tension spring;

the first connecting ring is connected with the head end pipe fitting, the second connecting ring is connected with the end cap, and the tension spring is connected between the first connecting ring and the second connecting ring.

With reference to the first possible implementation manner of the first aspect, the present invention provides a second possible implementation manner of the first aspect, wherein the head end pipe fitting includes: an end tube body and an insert;

the insert is sleeved on the end pipe body, and a slot is formed between the end pipe body and the insert;

the extension spring is installed in the slot.

In a second aspect, the present invention provides an aspiration catheter comprising: a catheter assembly and the tip assembly of the first aspect, the tip fitting being mounted to an end of the catheter assembly.

In combination with the second aspect, the present invention provides a first possible implementation of the second aspect, wherein the catheter assembly comprises: the injection section comprises a catheter body and an injection section inner tube;

the injection section inner tube is arranged inside the catheter body, the head end pipe fitting is arranged at the end part of the catheter body, and a suction cavity is formed between the head end pipe fitting and the injection section inner tube.

In combination with the first possible implementation manner of the second aspect, the present invention provides a second possible implementation manner of the second aspect, wherein the side wall of the catheter body is provided with a suction hole, and the suction hole is communicated with the suction cavity.

With reference to the first possible implementation manner of the second aspect, the present invention provides a third possible implementation manner of the second aspect, wherein a first developing ring is installed inside the catheter body, and the first developing ring is located in the suction cavity.

In combination with the first possible embodiment of the second aspect, the present invention provides a fourth possible embodiment of the second aspect, wherein the inner tube of the injection segment is provided with an annular groove;

and the side wall of the conduit body is provided with a jet hole communicated with the annular groove.

With reference to the fourth possible implementation manner of the second aspect, the present invention provides a fifth possible implementation manner of the second aspect, wherein the injection segment inner tube is provided with a liquid injection groove adapted to the liquid injection tube, and the liquid injection groove is communicated with the annular groove.

In combination with the first possible implementation manner of the second aspect, the present invention provides a sixth possible implementation manner of the second aspect, wherein a second developing ring is mounted on the injection segment inner tube.

The embodiment of the invention has the following beneficial effects: the elastic device is arranged on the head end pipe fitting and connected with the end cap, the end cap tends to cover the head end pipe fitting through the elastic device, and when the guide wire is used, the end cap is pushed to deviate from the head end pipe fitting; when the guide wire is not used, the elastic device drives the end cap to cover the head end pipe fitting, so that the end pipe orifice of the head end pipe fitting can be plugged.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is an exploded view of a head assembly provided by an embodiment of the present invention;

FIG. 2 is a cross-sectional view of a tip assembly provided in accordance with an embodiment of the present invention;

FIG. 3 is a right side view of an insert for a header assembly according to an embodiment of the present invention;

FIG. 4 is a cross-sectional view of an aspiration catheter provided in accordance with an embodiment of the present invention;

FIG. 5 is a schematic view of an aspiration catheter provided in accordance with an embodiment of the present invention;

FIG. 6 is a schematic view of an inner tube of an injection section of an aspiration catheter provided in accordance with an embodiment of the present invention;

fig. 7 is a schematic view of a tip assembly pushed open by a guidewire according to an embodiment of the present invention.

Icon: 001-head end pipe fitting; 101-a slot; 011-end tube body; 012-an insert; 002-elastic devices; 021-first connecting ring; 022-a second connection ring; 023-tension spring; 003-end cap; 004-a catheter assembly; 401-suction lumen; 402-an annular groove; 403-liquid injection groove; 041-catheter body; 411-suction hole; 412-an injection hole; 042-injection section inner tube; 421-a first tube portion; 422-a second tube portion; 423-third pipe section; 005-first developing ring; 006-liquid injection pipe; 007-second developing ring; 008-guide wire.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "physical quantity" in the formula, unless otherwise noted, is understood to mean a basic quantity of a basic unit of international system of units, or a derived quantity derived from a basic quantity by a mathematical operation such as multiplication, division, differentiation, or integration.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1, 2 and 7, an embodiment of the present invention provides a head assembly, including: a head end tube 001, an elastic device 002 and an end cap 003; the elastic device 002 is arranged on the head end pipe fitting 001, and the elastic device 002 is connected with the end cap 003; the elastomeric element 002 has a tendency to cover the end cap 003 against the head tube 001.

When the guide wire 008 is used to guide the head-end tube 001 to move along the blood vessel, the guide wire 008 is inserted into the head-end tube 001, and the pushing end cap 003 is deviated from the head-end tube 001, so that the guide wire 008 can pass through the head-end tube 001. When withdrawing from the seal wire 008, the elasticity of elastic component 002 acts on end cap 003 along the axial of head end pipe fitting 001 to make the tight lid of end cap 003 close in the tip of head end pipe fitting 001, at this moment, the seal wire 008 no longer occupies thrombus suction space, and, end cap 003 has blockked head end pipe fitting 001, can avoid the body fluid to enter into thrombus suction space through head end pipe fitting 001.

In another embodiment, the elastic device 002 and the end cap 003 can be an integral structure with resilient performance, so as to form a resilient rubber end cap, and the rubber end cap covers the end of the head pipe 001 in a natural state; when the guide wire 008 pushes against the rubber end cap, the rubber end cap deforms and opens so that the guide wire can extend from the head end tube 001; when the guide wire 008 is withdrawn, the rubber end cap is restored to a covering state under the elastic action of the connecting part.

In the embodiment of the present invention, the elastic device 002 includes: a first connection ring 021, a second connection ring 022, and a tension spring 023; the first connection ring 021 is connected with the head end pipe 001, and the second connection ring 022 is connected with the end cap 003, and the extension spring 023 is connected between first connection ring 021 and second connection ring 022.

Specifically, the first connection ring 021, the second connection ring 022, and the tension spring 023 may be formed in an integrated structure, or the tension spring 023 may be welded between the first connection ring 021 and the second connection ring 022. In the naturally contracted state of the tension spring 023, the first connecting ring 021 is coaxial with the second connecting ring 022, so that the end cap 003 is opposite to the head end pipe 001.

As shown in fig. 1, 2 and 3, the head end fitting 001 includes: the end pipe body 011 and the insert 012; the insert 012 is sleeved on the end pipe body 011, and a slot 101 is formed between the end pipe body 011 and the insert 012; a tension spring 023 is mounted in the slot 101.

Specifically, the slot 101 is disposed on an inner wall of the insert 012, or the slot 101 is disposed on an outer side wall of the end pipe body 011. Moreover, the slot 101 extends along the axial direction of the end pipe body 011, the insert 012 is tightly sleeved on the end pipe body 011, and the tension spring 023 is located in the slot 101, so that the elastic device 002 can be compactly installed on the head end pipe 001.

In addition, a plurality of the slots 101 can be arranged, and the slots 101 are arranged at intervals along the circumferential direction of the end pipe body 011; a plurality of tension springs 023 are connected between the first connecting ring 021 and the second connecting ring 022, the plurality of tension springs 023 are arranged at intervals along the circumferential direction, and the plurality of tension springs 023 are installed in the plurality of slots 101 in a one-to-one correspondence.

As shown in fig. 1, 4 and 7, an embodiment of the present invention provides an aspiration catheter, including: catheter assembly 004 and the tip assembly provided in the above embodiments, tip tubing 001 is mounted to the end of catheter assembly 004.

The suction catheter provided by the embodiment of the invention has the technical effect of the tip assembly, and when the guide wire 008 is used, the guide wire 008 can be ensured to pass through the catheter assembly 004 and the head end pipe fitting 001 so as to guide the suction catheter to an affected part; when the guide wire 008 is withdrawn, the elastic device 002 drives the end cap 003 to cover the head end pipe 001, so that body fluid is prevented from entering the catheter assembly 004 from the head end pipe 001 in the thrombus suction process. The head end pipe 001 is arranged at the end part of the catheter assembly 004, so that the guide wire 008 can be withdrawn when thrombus is sucked, the guide wire 008 no longer occupies the thrombus sucking space, and the thrombus capacity of the catheter assembly 004 is increased.

As shown in fig. 4, 5 and 7, in an embodiment of the present invention, a catheter assembly 004 includes: a catheter body 041 and an injection section inner tube 042; the injection section inner tube 042 is installed inside the catheter body 041, the head end pipe 001 is installed at the end part of the catheter body 041, and a suction cavity 401 is formed between the head end pipe 001 and the injection section inner tube 042. After withdrawal of the guidewire 008, the tip assembly closes off the end of the catheter body 041. The side wall of the catheter body 041 is provided with a suction hole 411, and the suction hole 411 communicates with the suction lumen 401. When aspirating thrombus, the thrombus may be aspirated into the aspiration lumen 401 through the aspiration holes 411.

In addition, a plurality of suction holes 411 are provided, and the plurality of suction holes 411 are arranged at intervals in the circumferential direction of the catheter body 041, so that it is possible to ensure that thrombus enters the suction lumen 401 smoothly.

As shown in fig. 4, a first developing ring 005 is installed inside the catheter body 041, the first developing ring 005 is located inside the suction lumen 401, and a second developing ring 007 is installed on the injection section inner tube 042. The first developing ring 005 and the second developing ring 007 are formed into mark rings by spraying radiopaque coatings, and the positions of injection and thrombus suction can be clearly confirmed under an X-ray machine.

Further, the inner tube 042 of the injection section is provided with an annular groove 402; the side wall of the conduit body 041 is provided with injection holes 412 communicating with the annular groove 402.

Specifically, the second developing ring 007 is coated on the circumferential surface of the annular groove 402, the liquid injected into the annular groove 402 can be injected through the injection holes 412 to disperse the thrombus, and the position of the injection segment can be confirmed by detecting the position of the second developing ring 007 under the X-ray.

As shown in fig. 4, 5 and 6, the injection section inner tube 042 is provided with a liquid injection groove 403 matched with the liquid injection tube 006, and the liquid injection groove 403 is communicated with the annular groove 402.

Specifically, the injection section inner tube 042 comprises: first pipe portion 421, second pipe portion 422, and third pipe portion 423, second pipe portion 422 being connected between first pipe portion 421 and third pipe portion 423, and second pipe portion 422 having a diameter smaller than that of first pipe portion 421, first pipe portion 421 and third pipe portion 423 having diameters approximately equal to each other, so that annular groove 402 may be formed around second pipe portion 422. The liquid injection groove 403 is axially arranged on the circumferential surfaces of the first pipe part 421 and the second pipe part 422, the liquid injection pipe 006 is inserted into the liquid injection groove 403, the liquid injection pipe 006 is welded with the injection section inner pipe 042, physiological saline can be injected into the annular groove 402 through the liquid injection pipe 006, the physiological saline in the annular groove 402 is injected to thrombus through the plurality of injection holes 412, and therefore the thrombus can be dispersed so that the thrombus can be sucked into the suction cavity 401.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An aspiration catheter, comprising: a catheter assembly (004) and a tip assembly;

the catheter assembly (004) comprises a catheter body (041), and a suction hole (411) is formed in the side wall of the catheter body (041);

the tip assembly includes: a head end pipe (001), an elastic device (002) and an end cap (003), wherein the head end pipe (001) is arranged at the end part of the catheter body (041);

the elastic device (002) is mounted on the head end pipe (001), and the elastic device (002) is connected with the end cap (003);

the elastic means (002) has a tendency to fit the end cap (003) to the head end fitting (001).

2. The aspiration catheter of claim 1, wherein the elastic means (002) comprises: a first connection ring (021), a second connection ring (022), and a tension spring (023);

first connecting ring (021) with head end pipe fitting (001) is connected, second connecting ring (022) with end cap (003) are connected, extension spring (023) is connected first connecting ring (021) with between second connecting ring (022).

3. The suction catheter as claimed in claim 2, wherein the head end tubing (001) comprises: the pipe end comprises an end pipe body (011) and an insert (012);

the insert (012) is sleeved on the end pipe body (011), and a slot (101) is formed between the end pipe body (011) and the insert (012);

the tension spring (023) is installed in the slot (101).

4. The aspiration catheter of claim 1, wherein the catheter assembly (004) comprises: an injection section inner tube (042);

the injection section inner tube (042) is installed inside the catheter body (041), a suction cavity (401) is formed between the head end pipe (001) and the injection section inner tube (042), and the suction hole (411) is communicated with the suction cavity (401).

5. The aspiration catheter of claim 4, wherein the catheter body (041) has a first developer ring (005) mounted inside, the first developer ring (005) being located inside the aspiration lumen (401).

6. The aspiration catheter of claim 4, wherein the injection section inner tube (042) is provided with an annular groove (402);

the side wall of the conduit body (041) is provided with an injection hole (412) communicated with the annular groove (402).

7. The suction catheter as claimed in claim 6, characterized in that the injection segment inner tube (042) is provided with an injection groove (403) adapted to the injection tube (006), the injection groove (403) communicating with the annular groove (402).

8. The aspiration catheter of claim 4, wherein the inner jet section tube (042) has a second visualization ring (007) mounted thereon.