AU2021102675A4 - Tissue drainage stent - Google Patents

Abstract

The present application relates to the technical field of minimally invasive medical devices, in particular, to a tissue drainage stent. The tissue drainage stent comprises a drainage tube and a first flange provided at one end of the drainage tube, the first flange protrudes from the outer wall of the drainage tube, and the drainage tube is hollow to form a drainage channel; the end of the drainage tube corresponding to target tissue is provided with the first flange that can be expanded outward, the first flange comprises a plurality of first supporting wings that expand outward, the first supporting wings can support a wall surface of the target tissue to prevent the wall surface of the target tissue from blocking the connection part between the drainage tube and the target tissue due to contact during a drainage process, thereby ensuring the smoothness of inter-tissue drainage and improving the treatment effect; moreover, the plurality of first supporting wings jointly support the wall surface of the tissue so that the wall surface is evenly stressed, thereby reducing irritation to the tissue. 1/5 Drawings b2 1 4 3 FIG. 1

Description

1/5

Drawings

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FIG. 1

Tissue Drainage Stent

Cross-Reference to Related Application

The present disclosure claims priority of Chinese patent application with the filing number 201920766219.0 filed on May 24, 2019 with the Chinese Patent Office, and entitled "Tissue Drainage Stent", the contents of which are incorporated herein by reference in entirety.

Technical Field

The present disclosure relates to technical filed of minimally invasive medical instruments, in particular, to a tissue drainage stent.

Background Art

With the development of endoscopy and endoscopic ultrasonography, the technique of the metal stent placed under the endoscope for inter-tissue anastomotic drainage has been developed accordingly, such as pancreatic cyst drainage, gastrojejunostomy, gallstone removal and the like. At present, there are anastomotic drainage stents on the market, for example, when the stent is used for drainage of pancreatic pseudocyst, if the cyst body becomes smaller, the cyst wall surfaces will be close to each other, and the close cyst wall surface will cover the end portion of the stent, resulting in non-smooth follow-up drainage and hindering further drainage. Moreover, the tip of the end surface of stent will even stimulate the close cyst wall surface, excessive stimulation can cause persistent inflammation or bleeding on the close cyst wall surface.

Therefore, it is urgent to propose an anastomotic drainage stent with sufficient drainage effect and less tissue stimulation.

Summary

The present disclosure aims at providing a tissue drainage stent, so as to solve the technical problems of non-smooth drainage of the tissue drainage stent and great stimulation to wall surface of the tissue existing in the prior art to a certain extent.

The present disclosure provides a tissue drainage stent, comprising a drainage tube and a first flange arranged at one end of the drainage tube; the first flange comprises a plurality of first support wings; one end of the first support wing is connected with the drainage tube, and the other end extends in a direction away from the center line of the drainage tube; and the plurality of first support wings are arranged along the circumferential direction of the drainage tube. Further, the first support wing is of flat sheet shape or curly sheet shape.

Further, the number of the first support wing is three, three first support wings are arranged at equal intervals along the circumferential direction of the drainage tube, and three first support wings are arranged in a rotational symmetry manner with respect to the central line of the drainage tube.

Further, the corner of one end of the first support wing away from the drainage tube is in an arc-shaped transition.

Further, a second flange is arranged on one end of the drainage tube away from the first flange;

the second flange is in a continuous flanging curling structure or a bulging spherical structure along the circumferential direction of the drainage tube; or

the second flange comprises a plurality of second support wings; one end of the second support wing is connected with the drainage tube, and the other end extends in a direction away from the center line of the drainage tube; and the plurality of second support wings are arranged along the circumferential direction of the drainage tube.

Further, the second support wing is of flat sheet shape, curly sheet shape or convex spherical shape.

Further, the radial extension length of the first flange and the second flange along the drainage tube is 0.3-2 times the outer diameter of the drainage tube. Further, at least part of the first support wings and at least part of the second support wings are provided with X-ray developing parts.

Further, the second flange is provided with a recovery line.

Further, the drainage tube, the first flange and the second flange are in a filamentous braided structure, and are coated with a biological leak proof film.

Compared with the prior art, the beneficial effects of the present disclosure are as follows. The tissue drainage stent of the present disclosure is configured to be placed into the body under endoscope for performing anastomotic drainage between tissues, wherein the inner portion of the drainage tube is hollow to form a drainage cavity, one end of which is communicated with the target tissue, and the other end is communicated with the anastomotic tissue, so as to conduct drainage between the target tissue and the anastomotic tissue. Because the cyst cavity of the target tissue (such as pancreatic pseudocyst) decreases during the drainage process, the wall surfaces of the cyst may fit together and then block the communicating portion between the drainage tube and the target tissue, resulting in non-smooth drainage between the tissues, therefore, in the present disclosure, one end of the drainage tube corresponding to the target tissues is provided with the first flange which can be expanded outwards, and the first flange comprises a plurality of first support wings expanded outwards, which can support the wall surface of the target tissues, thereby preventing the wall surfaces of target tissue from fitting together and blocking the communicating portion between the drainage tube and the target tissue during the drainage process, so as to ensure the smoothness of the drainage among tissues, and improve the effects of the treatment; meanwhile, the plurality of first support wings support the wall surface of the tissue jointly, which can make the stress of the wall surface even and reduce the stimulation to the tissue.

Brief Description of Drawings

In order to more clearly illustrate the specific embodiments of the present disclosure or technical solutions in the prior art, accompanying drawings which need to be used for description of the specific embodiments or the prior art will be introduced briefly below, and apparently, the accompanying drawings in the following description merely show some embodiments of the present disclosure, and those ordinarily skilled in the art still could obtain other drawings in light of these accompanying drawings, without using any inventive efforts.

FIG. 1 is a structural schematic view of tissue drainage stent provided in embodiments of the present disclosure; FIG. 2 is a structural schematic view of the first flange of tissue drainage stent provided in embodiments of the present disclosure;

FIG. 3 is another structural schematic view of the first flange of tissue drainage stent provided in embodiments of the present disclosure;

FIG. 4 is another structural schematic view of the first flange of tissue drainage stent provided in embodiments of the present disclosure;

FIG. 5 is another structural schematic view of the first flange of tissue drainage stent provided in embodiments of the present disclosure;

FIG. 6 is another structural schematic view of the first flange and the second flange of tissue drainage stent provided in embodiments of the present disclosure; FIG. 7 is another structural schematic view of the first flange and the second flange of tissue drainage stent provided in embodiments of the present disclosure; FIG. 8 is a top structural schematic view of a tissue drainage stent provided in FIG.6;

FIG. 9 is a top structural schematic view of a tissue drainage stent provided in FIG.7;

FIG. 10 is another top structural schematic view of tissue drainage stent provided in embodiments of the present disclosure;

FIG. 11 is another top structural schematic view of tissue drainage stent provided in embodiments of the present disclosure;

FIG. 12 is another side structural schematic view of tissue drainage stent provided in embodiments of the present disclosure; and

FIG. 13 is another structural schematic view of tissue drainage stent provided in embodiments of the present disclosure;

Reference signs in accompanying drawings:

1-drainage tube, 2-first flange, 201-first support wing, 3-second flange, 301 second support wing, 4, recovery line.

Detailed Description of Embodiments

The technical solutions of the present disclosure will be clearly and completely described below in combination with the accompanying drawings, and obviously, the embodiments described are part of the embodiments of the present disclosure, rather than all embodiments.

The components of the embodiments of the present disclosure, which are generally described and shown in the accompanying drawing herein, may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present disclosure provided in the accompanying drawings is not intended to limit the claimed scope of the present disclosure, but merely represents selected embodiments of the present disclosure.

Based on the embodiments of the present disclosure, all other embodiments obtained by those ordinarily skilled in the art, without making inventive effort, fall within the protection scope of the present disclosure.

In the description of the present disclosure, it should be noted orientation or positional relations indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", and "outer" are based on orientation or positional relations as shown in the accompanying drawings, merely for facilitating the description of the present disclosure and simplifying the description, rather than indicating or implying that related devices or elements have to be in the specific orientation, or configured or operated in a specific orientation, therefore, they should not be construed as limitations on the present disclosure. Besides, terms "first", "second" and "third" are merely for descriptive purpose, but should not be construed as indicating or implying relative importance.

In the description of the present disclosure, it should be noted that, unless otherwise definitely specified and limited, the terms "mount", "link" and "connect" should be understood in a broad sense. For example, they can be fixed connection, detachable connection or integrated connection; they can be mechanical connection or electrical connection; they can be directly attached or indirectly attached by intermediate medium. Connection can be the internal communication between two components. For those ordinarily skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific situation. According to some embodiments of the present disclosure, tissue drainage stent is described below referring to FIG. 1 -FIG.13.

As shown in FIG. 1 -FIG. 11, an embodiment of the present disclosure provides a tissue drainage stent, including a drainage tube 1 and a first flange 2 arranged at one end of the drainage tube 1, with the first flange 2 protruding from the outer wall of the drainage tube 1. The first flange 2 includes a plurality of first support wings 201; one end of first support wing 201 is connected with the drainage tube 1, the other end extends outwards in a direction away from the center line of the drainage tube 1; and the plurality of first support wings 201 are arranged in the circumferential direction of the drainage tube 1, that is, the plurality of first support wings 201 can be expanded outwards to be in an open structure and to form a support surface to support the target tissue.

Specifically, the tissue drainage stent of the embodiments of the present disclosure is configured to be placed into the body under endoscope for performing anastomotic drainage between tissues, wherein the inner portion of the drainage tube 1 is hollow to form a drainage cavity, one end of which is communicated with the target tissue, and the other end is communicated with the anastomotic tissue, so as to conduct drainage between the target tissue and the anastomotic tissue. Because the cyst cavity of the target tissue (such as pancreatic pseudocyst) decreases during the drainage process, the wall surfaces of the cyst may fit together and then block the communicating portion between the drainage tube 1 and the target tissue, resulting in non-smooth drainage, therefore, in the present disclosure, one end of the drainage tube 1 corresponding to the target tissues is provided with the first flange 2 which can be expanded outwards, and the first flange 2 comprises a plurality of first support wings 201 expanded outwards, which can support the wall surface of the target tissues, thereby preventing the wall surfaces of target tissue from fitting together and blocking the communicating portion between the drainage tube 1 and the target tissue during the drainage process, so as to ensure the smoothness of the drainage among tissues, and improve the effects of the treatment; meanwhile, the plurality of first support wings 201 support the wall surface of the tissue jointly, which can make the stress of the wall surface even and reduce the stimulation to the tissue.

In addition, in order to improve the stability of the support of the first flange 2 to the target tissue, as shown in FIG. 2 - FIG. 5, a plurality of first support wings 201 provided in the embodiment of the present disclosure can be unfolded in umbrella shape, petal shape or wind wheel shape, so as to support the wall surface of the target tissue by surrounding the outer circumference of the drainage tube 1, and thus ensure the normal drainage. Preferably, as shown in FIG. 2 and FIG. 3, when a plurality of first support wings 201 can be unfolded in umbrella shape, the supporting force of the first flange 2 required clinically can be adjusted by adjusting the number of braiding heads or the outside diameter size of the outermost edge of the umbrella end of the first support wing 201, so as to ensure the normal operation of drainage. It should be noted that, in order to avoid the unfolded first support wing 201 from causing stimulation to the target tissue, the first support wing 201 in the embodiment of the present disclosure has no sharp corners, and can have good attachment with the wall surface of the target tissue, and will not stimulate the tissue wall surface to cause inflammation or bleeding. In addition, the first support wing 201 has certain flexibility to reduce the stimulation to wall surface of the tissue.

Therefore, the tissue drainage stent of the present disclosure can achieve a long-lasting drainage effect during the treatment of drainage between tissues, and has less stimulation to tissues.

In an embodiment of the present disclosure, preferably, as shown in FIG. 2 - FIG. 11, first support wing 201 is of flat sheet shape or curly sheet shape.

When the first support wing 201 is of flat sheet shape, it extends along radial direction of the drainage tube 1, and can be of an umbrella shape (as shown in FIG. 2 and FIG. 3), petal shape (as shown in FIG. 4), or wind wheel shape (as shown in FIG. 5), etc. When first support wing 201 is of curly sheet shape, the curling direction can be along the radial direction of the drainage tube 1 (as shown in FIG. 6 and FIG. 7) or the peripheral direction of the drainage tube 1 (not shown in the figure). Preferably, when first support wing 201 curls in the radial direction or peripheral direction of the drainage tube 1, its opening direction is toward the target tissue, so an inlet for tissue fluid circulation can be formed between the first support wing 201 and the target tissue to facilitate the drainage of tissue fluid; meanwhile, the unique open structure at the inlet end will not form a fully closed cavity when the drainage tissue (such as pancreatic cyst) shrinks, and has the function of guiding the liquid to flow into the drainage tube.

In addition, it should be noted that when first flange 2 is of an umbrella shape, petal shape or wind wheel shape, the first support wing 201 is preferably of a flat sheet shape, and a plurality of first support wings 201 in flat sheet shape can be setup at intervals or stacked to present a complete support surface. When the first support wings 201 are of curly sheet shape, the number of first support wings 201 can be relatively small, preferably two or four.

In an embodiment of the present disclosure, preferably, as shown in FIG. 4, the number of first support wings 201 is three, three first support wings 201 are arranged at equal intervals along the circumferential direction of the drainage tube 1, and three first support wings 201 are arranged in a rotational symmetry manner with respect to the central line of the drainage tube 1, showing a structure in wind wheel shape. Three first support wings 201 arranged at equal intervals can support the wall surface of the target tissue effectively, and achieve the optimal support effect when the number of support wings is the least.

In an embodiment of the present disclosure, preferably, as shown in FIG. 7, the corner of one end of first support wing 201 away from the drainage tube 1 is in an arc-shaped transition.

In this embodiment, with the purpose of further improving the attachment between the first support wing 201 and the wall surface of the target tissue, and avoiding the stimulation of the first support wing 201 to the wall surface of the target tissue, in the present disclosure, the corner of one end of first support wing 201 away from the drainage tube 1 is provided in an arc-shaped transition, that is, the unfolded edge of the first support wing 201 is in an arc shaped transition, without sharp corners or seamed edges, so as to avoid stimulating the wall surface of the target tissue. To a certain extent, it overcomes the defects of strong stimulation of the existing inter-tissue metal drainage stent to tissue, which is easy to cause inflammation, bleeding or proliferation, etc.

In an embodiment of the present disclosure, preferably, as shown in FIG. 1, FIG. 6, FIG. 7, FIG.12 and FIG.13, the end of the drainage tube 1 away from the first flange 2 is provided with a second flange 3;

The second flange 3 is in a continuous flanging curling structure or bulging spherical structure along the circumferential direction of the drainage tube 1 (as shown in FIG. 12); or,

the second flange 3 comprises a plurality of second support wings 301; one end of the second support wing 301 is connected with the drainage tube 1, and the other end extends outward in a direction away from the center line of the drainage tube 1; and the plurality of second support wings 301 are arranged along the circumferential direction of the drainage tube 1.

In this embodiment, the end of the drainage tube 1 away from the first flange 2, that is, the end close to the anastomotic tissue, is provided with a second flange 3 protruding outwards, and the second flange 3 supports and is fixed with the anastomotic tissue. On the one hand, the second flange 3 can support the wall surface of the anastomotic tissue, prevent the anastomotic tissue from blocking the drainage cavity, and further ensure the smooth outflow of the drained material; on the other hand, the anastomotic tissue can fix the whole drainage stent through the second flange 3, prevent the drainage stent from falling into the abdominal cavity.

As for the specific structure of the second flange 3, it can be a continuous flanging curling structure or bulging spherical structure along the circumferential direction of the drainage tube 1, or it can also be in the form as a support wing of the first flange 2, as long as it can support and drain the anastomotic tissue and fix the whole stent.

It is necessary to note that, as shown in FIG. 12, when the second flange 3 is a continuous bulging spherical structure along the circumferential direction of the drainage tube 1, it is in a structure similar to the mushroom umbrella, and the bulging wall thereof is smooth and protrudes out of one end of the drainage tube 1, and the bulging wall thereof is also provided with an opening at a position corresponding to the opening end of the drainage tube 1 to form an inlet end.

In an embodiment of the present disclosure, preferably, as shown in FIG.1, FIG.6, FIG.7, and FIG.13, the second support wing 301 is of flat sheet shape, curly sheet shape or convex spherical shape.

In this embodiment, when the second flange 3 is in the form of an outward expanding support wing, the specific structure of the second support wing 301 can be of a flat sheet shape (as shown in FIG. 1) or a curly sheet shape (as shown in FIG. 6 and FIG. 7), or a convex spherical shape expanding outward (as shown in FIG. 13). When second support wing 301 is of flat sheet shape, or curly sheet shape, its structure and arrangement principle are the same as those of the first support wing 201, so it will not be repeated here. In addition, the second support wing 301 can also be of convex spherical shape expanding outwards, because the end of the anastomotic tissue does not need too large support area, as long as it is ensured that the second flange 3 can support the wall surface of the anastomotic tissue, avoid plugging the drainage cavity, meanwhile, and can fix the stent; and the support wing in convex spherical shape has better surface smoothness and is not easy to cause stimulation to the tissue.

In an embodiment of the present disclosure, preferably, as shown in FIG.12 and FIG. 13, in order to ensure that first flange 2 and second flange 3 have a certain supporting area to support the corresponding tissue and prevent the tissue from blocking the drainage cavity and hindering the drainage, in the embodiment of the present disclosure, the radial extension length of the first flange 2 and the second flange 3 along the drainage tube 1 is set as 0.3-2 times outer diameter of the drainage tube 1, that is, the outer diameter D1 of first flange 2 and the outer diameter D2 of second flange 3 are respectively more than 1.3 times the outer diameter D of the drainage tube 1, and preferably the outer diameters of the first flange 2 and the second flange 3 are respectively less than 3 times the outer diameter D of the drainage tube 1, so as to ensure that the overall size of the drainage stent is within a reasonable range and to ensure more adequate drainage of tissue fluid. In an embodiment of the present disclosure, preferably, in order to understand the support positioning situation of the internal drainage stent during X-ray imaging detection, the embodiment of the present disclosure is provided with an X-ray developing parts on at least part of the first support wings 201 and at least part of the second support wings 301. Further preferably, an X-ray developing parts can be correspondingly arranged on each first support wing 201 of the first flange 2 and each second support wing 301 of the second flange 3. The material of X-ray developing parts can be tantalum.

In an embodiment of the present disclosure, preferably, as shown in FIG. 1, FIG. 12 and FIG. 13, in order to facilitate the removal of the drainage stent at the end of drainage, the embodiment of the present disclosure is provided with a recovery line 4 on the second flange 3, and the drainage stent is removed by pulling the recovery line 4. Preferably, the recovery line 4 is arranged at the edge of the second flange 3. In addition, the material of recovery line 4 can be high molecular polymer or metal wire with good biocompatibility and not easy to be corroded by body fluid.

In an embodiment of the present disclosure, preferably, the drainage tube 1, the first flange 2 and the second flange 3 are all in a filamentous braided structure, specifically made by weaving memory alloy wires. Moreover, the drainage tube 1, the first flange 2 and the second flange 3 are all coated with a biological leak proof film, so as to prevent the leakage of drained material from the stent mesh, effectively inhibit the proliferation of tissue wall into the stent mesh contacted with it, and prevent the growth of granulation.

Preferably, the material of the biological leak proof film can be PTFE, PET or silica gel and other polymer materials with good biological properties, which will not cause biological toxicity and can facilitate the later recovery of the stent.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present disclosure, not to limit it; although the present disclosure has been described in detail with reference to the above-mentioned embodiments, those skilled in the art should understand that they can still modify the technical solution recorded in the above mentioned embodiments, or equivalently replace some or all of the technical features; and these modifications or substitutions do not make the essence of the corresponding technical solutions out of the scope of the technical solutions of the embodiments of the present disclosure.

Claims (5)

1. What is claimed is: 1. A tissue drainage stent, comprising a drainage tube and a first flange arranged at one end of the drainage tube, wherein the first flange comprises a plurality of first support wings, wherein each of the first support wings has one end connected with the drainage tube, and the other end extending in a direction away from a center line of the drainage tube; and the plurality of first support wings are arranged along a circumferential direction of the drainage tube.
2. 2. The tissue drainage stent according to claim 1, wherein each of the first support wings is of a flat sheet shape or curly sheet shape.
3. 3. The tissue drainage stent according to claim 1, wherein three first support wings are provided, the three first support wings are arranged at equal intervals along the circumferential direction of the drainage tube, and the three first support wings are arranged in a rotational symmetry manner with respect to the central line of the drainage tube.
4. 4. The tissue drainage stent according to claim 1, wherein a corner of one end of a first support wing away from the drainage tube is in an arc-shaped transition.
5. 5. The tissue drainage stent according to any one of claims 1-4, wherein a second flange is arranged on one end of the drainage tube away from the first flange, wherein the second flange is in a continuous flanging curling structure or a bulging spherical structure along the circumferential direction of the drainage tube; or the second flange comprises a plurality of second support wings, wherein each of the second support wings has one end connected with the drainage tube, and the other end extending in a direction away from the center line of the drainage tube; and the plurality of second support wings are arranged along the circumferential direction of the drainage tube.