CN214713773U - Suction catheter - Google Patents

Abstract

The utility model relates to a suction catheter, this suction catheter includes: the connecting joint, the diffusion stress pipe and the pipe body. The diffusion stress tube is connected with the connecting joint, the tube body is connected with one end, far away from the connecting joint, of the diffusion stress tube, the tube body is provided with a tube cavity, and the inner wall of the tube cavity is provided with a one-way valve. According to the suction catheter of this application embodiment, through setting up one-way valve, because one-way valve can be closed state after the suction, can prevent that the thrombus from flowing back to the blood vessel in to can effectively solve the problem of operation in-process thrombus backward flow.

Description

Suction catheter

Technical Field

The utility model relates to the technical field of medical equipment, especially, relate to a suction catheter.

Background

This section provides background information related to the present disclosure only and is not necessarily prior art.

In the medical field, blood vessels of human bodies are often blocked due to existence of thrombus, so that local tissues are caused to be necrotized due to ischemia, the health of the human bodies is influenced, and even the life of the human bodies is threatened. Thrombus generally refers to a mass of material within a blood vessel, and the components of the thrombus are insoluble materials.

At present, the method for treating thrombus mainly comprises a medicinal antithrombotic treatment method and an artificial mechanical method for physically restoring the unobstructed blood vessel, but because the concentration of thrombolytic anticoagulant medicaments entering the blood vessel cannot be too high, otherwise, side effects and toxicity are generated on a human body, and simultaneously because the medicaments are metabolized and discharged in the human body, the concentration of the antithrombotic medicaments existing in the blood vessel is lower, and the antithrombotic treatment by the antithrombotic medicaments has the defects of slow action effect and the like, and the method cannot be used for rescuing acute thrombotic diseases such as acute myocardial infarction, cerebrovascular infarction, acute lower limb deep vein embolism and the like, and for the diseases, only a physical thrombus removal method can be adopted. Physical thrombectomy is commonly accomplished in the prior art using a thrombectomy catheter, which is delivered along the vessel to the site of the thrombus by direct application of negative pressure to withdraw the thrombus, allowing the vessel to reestablish hemodynamic activity.

There are many thrombus aspiration catheters on the market, and the technology of thrombus treatment is gradually mature, but in the actual operation, the phenomenon of thrombus backflow may occur, which causes certain difficulty and risk to the operation.

SUMMERY OF THE UTILITY MODEL

The utility model aims at least solving the problem of thrombus reflux in the operation process. The purpose is realized by the following technical scheme:

embodiments of the present application provide an aspiration catheter, comprising:

the connecting joint is connected with the power supply device,

a diffusion stress tube connected with the connection joint, an

The pipe body, the pipe body with the diffusion stress pipe is kept away from the one end of attach fitting is connected, the pipe body has the lumen, the lumen inner wall is provided with one-way lamella.

According to the suction catheter of this application embodiment, through setting up one-way valve, because one-way valve can be closed state after the suction, can prevent that the thrombus from flowing back to the blood vessel in to can effectively solve the problem of operation in-process thrombus backward flow.

In addition, according to the embodiment of the present invention, the following additional technical features may be provided:

in one embodiment, the one-way valve comprises at least two flaps, and the at least two flaps are arranged around the circumference of the inner wall of the lumen.

In one embodiment, the flaps are two, and an included angle between the extending direction of the flaps and the axial direction of the tube cavity is 20-35 °.

In one of them embodiment, the flap includes the stiff end and with the free end that the stiff end links to each other, the flap passes through the stiff end is fixed lumen inner wall, and two are adjacent the free end of flap at least partially overlaps.

In one embodiment, the thickness of the flap decreases from the fixed end to the free end.

In one embodiment, a developing point is disposed at a free end of each of the petals, and the developing points on two adjacent petals are overlapped with each other.

In one embodiment, the tube body comprises a proximal section and a distal section connected with the proximal section, the diffusive stress tube is connected with the proximal section, the hardness of the proximal section is greater than that of the distal section, and the one-way valve is arranged on the proximal section.

In one embodiment, the tube comprises an outer layer, an intermediate layer and an inner layer from outside to inside, and the outer layer of the proximal section has a hardness greater than that of the outer layer of the distal section.

In one embodiment, the intermediate layer of the proximal section is braided using metal wires, and the intermediate layer of the distal section is spiraled using metal wires.

In one embodiment, the one-way flap and the inner layer are integrally formed.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

fig. 1 is a schematic structural view of a suction catheter in a first embodiment of the present invention;

FIG. 2 is a schematic view of the body of the suction catheter shown in FIG. 1 with the one-way flap closed;

FIG. 3 is a schematic view of the body of the suction catheter shown in FIG. 1 with the one-way flap open;

FIG. 4 is a schematic view of a one-way flap;

fig. 5 is a schematic structural view of a suction catheter according to a second embodiment of the present invention.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

For convenience of description, spatially relative terms, such as "inner", "outer", "lower", "below", "upper", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" can include both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

It should be noted that in the present application, the end close to the operator is generally referred to as "proximal end", the end far from the operator is referred to as "distal end", and the "proximal end" and the "distal end" of any component of the aspiration catheter are defined according to this principle. "axial" generally refers to the length of the aspiration catheter as it is being delivered, and "radial" generally refers to the direction of the aspiration catheter perpendicular to its "axial" direction, and defines both "axial" and "radial" directions for any component of the aspiration catheter in accordance with this principle.

Referring to fig. 1, a suction catheter 10 according to a first embodiment of the present application includes a connection joint 11, a diffusive stress pipe 12, and a pipe body 13, wherein the diffusive stress pipe 12 is connected to the connection joint 11, and the pipe body 13 is connected to an end of the diffusive stress pipe 12 away from the connection joint 11. The diffusion stress tube 12 is a soft injection molding part with a conical shape, and is used for relieving or diffusing stress generated when the tube body 13 is bent, and avoiding the connection part of the tube body 13 and the connection joint 11 from being broken. The connection fitting 11 is intended for connection to a suction device (not shown).

Referring to fig. 2, the tube 13 has a lumen 14, and a one-way flap 15 is disposed on the inner wall of the lumen 14. When the suction device starts to work, the one-way flap 15 is in an open state under the action of negative pressure of the suction device, thrombus can pass through the one-way flap 15, when the suction device stops working, the one-way flap 15 is automatically closed under the action of blood backflow, and the thrombus is difficult to flow back to a blood vessel. Through setting up one-way flap 15, because one-way flap 15 can be the closed condition after the suction, can prevent that the thrombus from flowing back to the blood vessel to can effectively solve the problem of operation in-process thrombus backward flow.

In an embodiment, the tube body 13 includes a proximal section 131 and a distal section 132 connected to the proximal section 131, the diffusive stress tube 12 is connected to the proximal section 131, the hardness of the proximal section 131 is greater than that of the distal section 132, and the one-way flap 15 is disposed on the proximal section 131, so that the one-way flap 15 is more stable and less prone to deformation because the one-way flap 15 is disposed at a position with greater hardness, which is beneficial to exerting the function of the one-way flap 15. In one embodiment, the one-way flap 15 is positioned 0-100mm from the junction of the proximal segment 131 and the distal segment 132. In one embodiment, the proximal section 131 is 500-1400mm in length.

In one embodiment, the tube 13 includes an outer layer 133, an intermediate layer 134, and an inner layer 135 from the outside to the inside, and the outer layer 133 of the proximal section 131 has a hardness greater than the hardness of the outer layer 133 of the distal section 132. In one embodiment, the outer layer 133 is made of a polymer material, such as block polyether amide (PEBAX), nylon, Thermoplastic Polyurethane (TPU), polyolefin elastomer (POE), polypropylene (PP), Polyethylene (PE), and the like. The proximal section 131 and the distal section 133 of the outer layer 133 may be made of the same polymer or different polymers. The thickness of the proximal and distal sections 131, 132 of the outer layer 133 may be the same or different. In one embodiment, the distal section 132 of the outer layer 133 is made of a relatively thin and soft material to ensure accessibility of the distal section 132, and the proximal section 131 of the outer layer 133 is made of a relatively thick and hard material to ensure pushability of the proximal section 131. In one embodiment, the outer layer 133 has a wall thickness of 0.05-0.7mm and a hardness of 15-85D. In one embodiment, the distal section 132 of the outer layer 133 is formed of Thermoplastic Polyurethane (TPU) and has a durometer of 15D, and the proximal section 131 of the outer layer 133 is formed of nylon and has a durometer of 80D. To enhance the visualization of the aspiration catheter 10, in one embodiment, a visualization material, such as barium sulfate, iopamidol, iohexol, ioversol, etc., is added to the outer layer 133.

The intermediate layer 134 is made of a metal material, such as nickel titanium, stainless steel, etc. In one embodiment, the intermediate layer 134 of the proximal section 131 is braided using a wire, and the intermediate layer 134 of the distal section 132 is spiraled using a wire. In one embodiment, the intermediate layer 134 of the proximal section 131 is braided using 8-16 strands of wire, which may be round wire having a wire diameter of 0.001-0.005 inch or flat wire having a width of 0.001-0.005 inch and a thickness of 0.001-0.005 inch, with a braided PPI of 20-120. The intermediate layer 134 of the distal section 132 is formed by a helical nickel titanium wire having a pitch of 0.007 to 2mm, preferably 0.08 to 0.8 mm. The intermediate layer 134 of the distal section 132 may be formed as a constant pitch helix or may be formed as a variable pitch helix, e.g., with the pitch tapering from the distal end to the proximal end.

The inner layer 135 is made of a material having a relatively smooth surface, such as Polytetrafluoroethylene (PTFE), polyolefin elastomer (POE), Polyoxymethylene (POM), or the like. The one-way flap 15 is disposed on the inner layer 135. With continued reference to fig. 2, the one-way valve 15 includes at least two flaps 151, and the at least two flaps 151 are disposed around the circumference of the inner wall of the lumen 14. In one embodiment, flaps 151 include a fixed end 1511 and a free end 1512 connected to fixed end 1511, flaps 151 are fixed to the inner wall of lumen 14 by fixed end 1511, and free ends 1512 of two adjacent flaps 1511 at least partially overlap. Referring to fig. 2 and 3, when the aspiration device is activated, the free ends 1512 of the flaps 151 are separated from each other to open, and the thrombus can pass through. When the suction device stops working, the free ends 1512 of the flaps 151 abut against each other due to the backflow of blood, and assume a closed state, in which case the thrombus cannot pass. In one embodiment, the flaps 151 are two pieces, and the two flaps 151 are symmetrical. In a natural state, an included angle between the extending direction of the flaps 151 and the axial direction of the lumen 14 is 20 to 35 °, that is, an included angle formed by two flaps 151 is 40 to 70 °. When the suction device starts to work, the free ends of the flaps 151 move towards the inner wall of the tube cavity 14, and the extending direction of the flaps 151 and the axial direction of the tube cavity 14 form an included angle of 0-10 degrees. In one embodiment, the thickness of the flap 151 gradually decreases from the fixed end 1511 to the free end 1512, which facilitates smooth opening and closing of the one-way flap 15. In one embodiment, the thickness of fixed end 1511 is 0.001-0.01 inch and the thickness of free end 1512 is 0.0008-0.008 inch.

In one embodiment, the free end 1512 of each flap 151 is provided with a development point 1513, and the development points 1513 of two adjacent flaps 151 coincide with each other. In the natural state, the development points 1513 are overlapped, and when the one-way flap 15 is opened, the development points 1513 are separated from each other, and at this time, two development points 1513 can be clearly seen. By providing a visualization point 1513 on the free end 1512 of 151, it may be helpful to observe the position and state of the one-way flap 15. The development sites 1513 may be circular, triangular, square, or other irregular shapes. Area of developing point 1513Should not be too large, the area of the single developing point 1513 is not more than 20mm²Preferably, the area of the single development point 1513 is 0.25-3mm². In one embodiment, the development sites 1513 may be affixed to the flaps 151 by adhesive, crimping, heat staking, or the like. In one embodiment, the development sites 1513 are made of platinum-iridium alloy, each development site 1513 has the same shape and size, and has a surface area of 1mm²The development point 1513 is fixed to the flap 151 by adhesion. For example, dissolving polypropylene (PP) particles into a xylene solution, preparing a solution with a certain concentration (preferably 10% -40%), placing the development spots 1513 into the solution until the surface is sufficiently wetted, taking out the development spots 1513, placing the development spots on the flaps 151, and volatilizing the solution.

In one embodiment, the one-way flap 15 is a unitary structure with the inner layer 135. Referring also to fig. 4, the one-way flap 15 may be a separate structure. The one-way flap 15 is made of silica gel and is formed by injection molding of liquid silica gel. The one-way flap 15 is fixed on the proximal section 131 by means of adhesion and is 0-100mm away from the joint of the proximal section 131 and the distal section 132. During the manufacturing process, the one-way flap 15 is adhered to the proximal section 131 of the inner layer 135, and then the proximal section 131 and the distal section 132 of the inner layer 135 are adhered together with medical glue.

Referring to fig. 5, a suction catheter 10a of the second embodiment of the present application has substantially the same structure as the suction catheter 10 of the first embodiment, except that: the one-way flap 15a includes three flaps 151a, and the three flaps 151a are circumferentially and uniformly arranged around the inner layer 135 a. In one embodiment, adjacent flaps 151a are tangentially arranged such that the gap formed by three flaps 151a is small. When the suction device starts to work, the one-way flap 15a is in an open state, thrombus can pass through the one-way flap 15a, and when the suction device stops working, the one-way flap 15a is closed, and thrombus cannot pass through the one-way flap 15 a. In one embodiment, the flap 151a is made of silicone, Polytetrafluoroethylene (PTFE), polyolefin elastomer (POE), or the like. In one embodiment, flaps 151a and inner layer 135a are injection molded.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. An aspiration catheter, comprising:

the connecting joint is connected with the power supply device,

a diffusion stress tube connected with the connection joint, an

The pipe body, the pipe body with the diffusion stress pipe is kept away from the one end of attach fitting is connected, the pipe body has the lumen, the lumen inner wall is provided with one-way lamella.

2. The aspiration catheter of claim 1, wherein the one-way valve comprises at least two flaps disposed circumferentially around the inner wall of the lumen.

3. The aspiration catheter of claim 2, wherein the flaps are two, and an included angle between the extending direction of the flaps and the axial direction of the lumen is 20 ° to 35 °.

4. The suction catheter of claim 2, wherein the flaps include a fixed end and a free end connected to the fixed end, the flaps being fixed to the inner lumen wall by the fixed end, the free ends of two adjacent flaps at least partially overlapping.

5. The suction catheter of claim 4, wherein the flap tapers in thickness from the fixed end to the free end.

6. The suction catheter as claimed in claim 4, wherein each of said petals has a development point at a free end thereof, said development points of two adjacent petals being coincident with each other.

7. The aspiration catheter of claim 1, wherein the tube body includes a proximal section and a distal section connected to the proximal section, the diffusive stress tube is connected to the proximal section, the proximal section has a stiffness greater than a stiffness of the distal section, and the one-way flap is disposed on the proximal section.

8. The aspiration catheter of claim 7, wherein the tube comprises an outer layer, an intermediate layer, and an inner layer from outside to inside, the outer layer of the proximal segment having a hardness greater than the hardness of the outer layer of the distal segment.

9. The aspiration catheter of claim 8, wherein the intermediate layer of the proximal section is braided using wire and the intermediate layer of the distal section is spiraled using wire.

10. The suction catheter of claim 8, wherein the one-way flap is of unitary construction with the inner layer.

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