ES1285656U - 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.

Description

DESCRIPTION

Tissue drainage stent

TECHNICAL FIELD

The present description relates to the technical field of minimally invasive medical instruments, in particular, to a tissue drainage stent.

BACKGROUND OF THE TECHNIQUE

With the development of endoscopy and endoscopic ultrasonography, the technique of metal stent placed under the endoscope for intertissue anastomotic drainage has 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 a pancreatic pseudocyst, if the cyst body becomes smaller, the cyst wall surfaces will be close to each other and the nearby cyst wall surface will cover the terminal part of the stent, resulting in poor follow-up drainage and making further drainage difficult. In addition, the tip of the terminal surface of the stent will even stimulate the near surface of the cyst wall, excessive stimulation may cause persistent inflammation or bleeding in the near surface of the cyst wall.

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

SUMMARY

The present disclosure aims to provide a tissue drainage stent to solve the drainage technical problems not without problems of the tissue drainage stent and a great stimulation to the tissue wall surface 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 disposed 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 drain pipe and the other end extends in a direction away from the center line of the drain pipe; and the plurality of first support wings are arranged along the circumferential direction of the drain pipe.

Furthermore, the first supporting wing is in the form of a flat sheet or the form of a curled sheet.

Furthermore, the number of the first support wing is three, three first support wings are arranged at equal intervals along the circumferential direction of the drain pipe, and three first support wings are arranged rotationally symmetric with respect to to the center line of the drain pipe.

Also, the corner of one end of the first support wing away from the drain pipe is in an arc-shaped transition.

Furthermore, a second flange is provided at an end of the drain pipe remote from the first flange;

the second flange is in a continuous flange crimping structure or a bulging spherical structure along the circumferential direction of the drain pipe; or

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

In addition, the second supporting wing has a flat sheet shape, a curled sheet shape, or a convex spherical shape.

Also, the radial extension length of the first flange and the second flange along the drain pipe is 0.3-2 times the outer diameter of the drain pipe.

Furthermore, at least part of the first support wings and at least part of the second support wings are provided with X-ray developing parts.

In addition, the second flange is provided with a recovery line.

In addition, the drain tube, the first flange and the second flange are in a filamentary braided structure and are covered with a leak-proof biological film.

Compared with the prior art, the beneficial effects of the present disclosure are as follows.

The tissue drainage stent of the present description is configured to be placed in the body under an endoscope to perform anastomotic drainage between tissues, wherein the inner part of the drainage tube is hollow to form a drainage cavity, one end of which is communicates with the target tissue, and the other end communicates with the anastomotic tissue, to effect 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 procedure, the cyst wall surfaces may fit together and then block the communicating part between the drainage tube and the target tissue, which results in drainage not without problems between the tissues, therefore, in the present description, one end of the drainage tube corresponding to the target tissues is provided with the first outwardly expandable flange, and the The first flange comprises a plurality of outwardly expanded first support wings, which can support the wall surface of the target tissues, thus preventing the wall surfaces of the target tissue from engaging with each other and blocking the communicating part between the drainage tube and the target tissue during the drainage procedure, to ensure ease of drainage between tissues and enhance treatment effects; meanwhile, the plurality of first support wings support the wall surface of the tissue together, which can make the tension of the wall surface uniform and reduce the stimulation to the tissue.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the specific embodiments of the present description or technical solutions in the prior art, the attached drawings to be used for the description of the specific embodiments or the prior art, and apparently, the attached drawings in the The following description merely shows some embodiments of the present description, and still other drawings could be obtained by those skilled in the art in light of these accompanying drawings, without using any inventive effort.

Figure 1 is a schematic structural view of the tissue drainage stent provided in embodiments of the present disclosure;

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

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

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

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

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

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

Figure 10 is another top structural schematic view of the tissue draining stent provided in embodiments of the present disclosure;

Figure 11 is another top structural schematic view of the tissue draining stent provided in embodiments of the present disclosure;

Figure 12 is another side structural schematic view of the tissue drainage stent provided in embodiments of the present disclosure; Y

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

Reference signs in the attached drawings:

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

DETAILED DESCRIPTION OF ACHIEVEMENTS

The technical solutions of the present description will be clearly and fully described below in conjunction with the attached drawings, and obviously, the described embodiments are part of the embodiments of the present description, rather than all the embodiments.

The components of the embodiments of the present description, which are generally described and shown in the accompanying drawing in this invention, can 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 description, all other embodiments obtained by those skilled in the art, without making inventive efforts, fall within the scope of protection of the present description.

In the description of the present description, it should be noted that the orientation or positional relationships indicated by terms such as "center", "top", "bottom", "left", "right", "vertical", "horizontal", "internal" and "external" are based on the orientation or positional relationships as shown in the accompanying drawings, merely to facilitate the description of the present description and simplify the description, rather than to indicate or imply that the devices or elements related they have to be in the specific orientation, or configured or operated in a specific orientation, therefore they should not be construed as limitations to this description. Furthermore, the terms "first", "second" and "third" are merely for descriptive purposes, but should not be construed to indicate or imply relative importance.

In the description of the present description, it should be noted that, unless otherwise specified and definitely limited, the terms "mount", "link" and "connect" are to 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 linked directly or indirectly by an intermediate means. The connection can be the internal communication between two components. For those skilled in the art, the specific meaning of the above terms in the present description can be understood according to the specific situation.

According to some embodiments of the present description, the tissue drainage stent is described below with reference to Figure 1 - Figure 13.

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

Specifically, the tissue drainage stent of the embodiments of the present description is configured to be placed in the body under the endoscope to perform anastomotic drainage between tissues, wherein the inner part of the drainage tube 1 is hollow to form a drainage cavity, one end of which communicates with the target tissue, and the other end communicates with the anastomotic tissue, to effect drainage between the target tissue and the anastomotic tissue. Because the target tissue cyst cavity (such as pancreatic pseudocyst) decreases during the drainage procedure, the cyst wall surfaces may engage with each other and then block the communicating portion between the drainage tube 1 and the target tissue, resulting in drainage that is not without problems, therefore In the present description, one end of the drainage tube 1 corresponding to the target tissues is provided with the first outwardly expandable flange 2, and the first flange 2 comprises a plurality of outwardly expanded first support wings 201, which can support the wall surface of the target tissues, thus preventing the wall surfaces of the target tissue from colliding with each other and blocking the communication part between the drainage tube 1 and the target tissue during the drainage procedure, to ensure the ease of drainage between tissues, and improve the effects of treatment; meanwhile, the plurality of first support wings 201 support the tissue wall surface together, which can make the wall surface tension uniform and reduce the stimulation to the tissue.

Furthermore, to improve the stability of the support of the first flange 2 to the target tissue, as shown in figure 2 - figure 5, a plurality of first support wings 201 provided in the embodiment of the present description can be unfolded in the form of an umbrella , petal shape or wind turbine shape, to support the target tissue wall surface surrounding the outer circumference of the drainage tube 1, and thus ensure normal drainage. Preferably, as shown in Fig. 2 and Fig. 3, when a plurality of umbrella-shaped first support wings 201 can be deployed, the clinically required support force of the first flange 2 can be adjusted by adjusting the number of heads. of braid or the outer diameter size of the outermost edge of the umbrella end of the first support wing 201, to ensure the normal operation of the drain.

It should be noted that, in order to prevent the unfolded first support wing 201 from causing stimulation to the target tissue, the first support wing 201 in the embodiment of the present description has no sharp corners and can have a good bond with the tissue wall surface. target and will not stimulate the tissue wall surface to cause inflammation or bleeding. Furthermore, the first support wing 201 has some flexibility to reduce stimulation to the tissue wall surface.

Therefore, the tissue drainage stent of the present disclosure can achieve a durable drainage effect during intertissue drainage treatment and has less stimulation to tissues.

In an embodiment of the present description, preferably, as shown in Fig. 2 - Fig. 11, the first support wing 201 is in the form of a flat sheet or a curled sheet.

When the first supporting wing 201 is in the form of a flat sheet, it extends along the radial direction of the drain pipe 1 and can be in the shape of an umbrella (as shown in Fig. 2 and Fig. 3), a petal shape (as shown in figure 4) or wind turbine shape (as shown in figure 5), etc. When the first support wing 201 is in the form of a curled sheet, the curling direction may be along the radial direction of the drain tube 1 (as shown in Fig. 6 and Fig. 7) or the peripheral direction of the tube drain 1 (not shown in the figure). Preferably, when the first support wing 201 is curled in the radial direction or peripheral direction of the drainage tube 1, its opening direction is toward the target tissue, whereby an inlet for tissue fluid circulation can be formed between the wing. first support wing 201 and the target tissue to facilitate drainage of tissue fluid; meanwhile, the unique open structure at the inlet end will not form a completely 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.

Furthermore, it should be noted that when the first flange 2 has an umbrella shape, a petal shape or a wind turbine shape, the first support wing 201 preferably has a flat sheet shape, and a plurality of first support wings 201 in the form of a flat sheet can be configured at intervals or stacked to present a complete support surface. When the first support wings 201 are in the form of a crimped sheet, the number of the first support wings 201 may be relatively small, preferably two or four.

In an embodiment of the present description, 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 direction circumference of the drain pipe 1, and three first supporting wings 201 are arranged rotationally symmetrically with respect to the center line of the drain pipe 1, showing a wind turbine-shaped structure. 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 least.

In an embodiment of the present description, preferably, as shown in Fig. 7, the corner of one end of the first support wing 201 away from the drain pipe 1 is in an arc-shaped transition.

In this embodiment, for the purpose of further enhancing the attachment between the first support wing 201 and the target tissue wall surface, and avoiding stimulation of the first support wing 201 to the target tissue wall surface, in the In this description, the corner of one end of the first support wing 201 away from the drain pipe 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. arc-shaped, without sharp corners or downturned edges, to avoid stimulating the wall surface of the target tissue. To a certain extent, it overcomes the defects of strong stimulation of the existing intertissue metal drainage stent to the tissue, which is easy to cause inflammation, bleeding or proliferation, etc.

In an embodiment of the present description, preferably, as shown in figure 1, figure 6, figure 7, figure 12 and figure 13, the end of the drain pipe 1 away from the first flange 2 is provided with a second flange 3;

The second flange 3 is in a continuous flange crimping structure or bulging spherical structure along the circumferential direction of the drain pipe 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 drain pipe 1 and the other end extends outward in a direction away from the center line of the drain pipe 1; and the plurality of second support wings 301 are arranged along the circumferential direction of the drain pipe 1.

In this embodiment, the end of the drainage tube 1 far 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 trouble-free outflow of the drained material; on the other hand, the anastomotic tissue can fix the entire drainage stent through the second flange 3, preventing the drainage stent from falling into the abdominal cavity.

As for the specific structure of the second flange 3, it may be a continuous flange crimping structure or a bulging spherical structure along the circumferential direction of the drain pipe 1, or it may also be shaped like a supporting wing. of the first flange 2, as long as it can support and drain the anastomotic tissue and secure the entire stent.

It is necessary to note that, as shown in Fig. 12, when the second flange 3 is a bulging spherical structure continuous along the circumferential direction of the drain pipe 1, it is in a mushroom cap-like structure, and the bulge wall thereof is smooth and protrudes from one end of the drain pipe 1, and the bulge wall thereof is also provided with an opening at a position corresponding to the opening end of the drain pipe 1 to form an inlet end .

In an embodiment of the present description, preferably, as shown in Fig. 1, Fig. 6, Fig. 7 and Fig. 13, the second support wing 301 has a flat sheet shape, a curled sheet shape or a convex spherical shape. .

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

In an embodiment of the present description, preferably, as shown in the figure. 12 and figure 13, to ensure that the first flange 2 and the second flange 3 have a certain support area to support the corresponding tissue and prevent the tissue from blocking the drainage cavity and hindering drainage, in the embodiment of the present description, the radial extension length of the first flange 2 and the second flange 3 along the drain pipe 1 is set as 0.3-2 times the outer diameter of the drain pipe 1, that is, the outer diameter D1 of the first flange 2 and the external diameter D2 of the second flange 3 are, respectively, more than 1.3 times the external diameter D of the drain pipe 1, and preferably the external 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, 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 description, preferably, in order to understand the supporting positioning situation of the internal drainage stent during X-ray imaging, the embodiment of the present description is provided with X-ray developing parts in at least part of the first support wings 201 and at least part of the second support wings 301. Also, preferably, an X-ray developing part may be correspondingly disposed 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 the X-ray developing parts may be tantalum.

In an embodiment of the present description, preferably, as shown in figure 1, figure 12 and figure 13, to facilitate the removal of the drainage stent at the end of drainage, the embodiment of the present description is provided with a line from retrieval 4 on the second flange 3, and the drainage stent is removed by pulling the retrieval line 4. Preferably, the retrieval line 4 is arranged on the edge of the second flange 3.

In addition, the material of the 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 description, preferably, the drain tube 1, the first flange 2 and the second flange 3 are all of a filamentary braided structure, specifically manufactured by weaving memory alloy wires. In addition, the drainage tube 1, the first flange 2 and the second flange 3 are covered with a biological leak-proof film, in order to prevent the leakage of material drained from the stent mesh, effectively inhibit the proliferation of the tissue wall in the stent mesh in contact with it, and prevent the growth of granulation.

Preferably, the leak-proof biofilm material may be PTFE, PET or silica gel and other polymeric materials with good biological properties, which will not cause biological toxicity and can facilitate subsequent recovery of the stent.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present description, not to limit it; although the present description has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solution recorded in the aforementioned 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 outside the scope of the technical solutions of the embodiments of the present description.

Claims (10)

1. A tissue drainage stent, comprising a drainage tube and a first flange disposed 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 have one end connected with the drain pipe and the other end extends in a direction away from a center line of the drain pipe; and the plurality of first support wings are arranged along a circumferential direction of the drain pipe. The tissue draining stent according to claim 1, wherein each of the first support wings has a flat sheet shape or a crimped sheet shape. 3. The tissue drainage stent according to claim 1, wherein three first support wings are provided, the first three support wings are disposed at equal intervals along the circumferential direction of the drainage tube, and the first three support wings are arranged rotationally symmetrical with respect to the center line of the drain pipe. 4. The tissue drainage stent according to claim 1, wherein a corner of an end of a first support wing away from the drainage tube is in an arc-shaped transition. 5. The tissue drainage stent according to any of claims 1-4, wherein a second flange is disposed at an end of the drainage tube remote from the first flange, wherein the second flange is in a crimp structure of continuous flange or a bulging spherical structure along the circumferential direction of the drain pipe; or the second flange comprises a plurality of second support wings, wherein each of the second support wings has one end connected to the drain tube and the other end extends in a direction away from the center line of the drain tube. sewer system; and the plurality of second support wings are arranged along the circumferential direction of the drain pipe. The tissue draining stent according to claim 5, wherein each of the second support wings has a flat sheet shape, a curled sheet shape, or a convex spherical shape. 7. The tissue drainage stent according to claim 5, wherein a radial extension length of the first flange and the second flange along the drainage tube is 0.3-2 times an external diameter of the drainage tube. The tissue draining stent according to claim 5, wherein at least part of the first support wings and at least part of the second support wings are provided with X-ray relief portions. 9. The tissue drainage stent according to claim 5, wherein the second flange is provided with a retrieval line. 10. The tissue drainage stent of claim 5, wherein the drainage tube, the first flange and the second flange are all of a filamentary braided structure and are all coated with a leak-proof biological film.