Automatically expandable bile duct stent for bile duct stricture

Abstract

The present invention provides an automatic dilatation type bile duct stent for bile duct stenosis. The bile duct stent is a single channel, including a head tube segment, a body tube segment and a tail tube segment. The head tube segment and the tail tube segment are in a straight line, a single pigtail or a sphere. The head tube segment is provided with an elliptical side hole I and a side wing I, and a first channel is provided therein. The tail tube segment is provided with an elliptical side hole II and a side wing II, and a third channel is provided therein. The body tube segment is provided with a second channel, and the outer wall is a concave tube wall. The concave tube wall is sequentially wrapped with a columnar water-absorbing material and a polyethylene balloon membrane from the inside to the outside. The water-absorbing material is connected to the second channel through a through hole provided on the concave tube wall. The water-absorbing material gradually expands after absorbing water in the bile through the through hole, and gradually fills the polyethylene balloon membrane to form a columnar balloon to dilate the narrow bile duct. The present invention is simple to implant, can automatically dilate the narrow bile duct, reduce the number of drainage tube replacements, shorten the course of disease, and has low manufacturing cost.

Description

Technical Field

[0001] The present invention relates to the field of minimally invasive medical technology and surgical instrument technology, and in particular to an automatic expandable bile duct stent for bile duct stenosis. Background Art

[0002] Biliary stenosis is a common and frequently occurring disease in my country, including inflammatory bile duct stenosis, malignant bile duct stenosis, traumatic bile duct stenosis and iatrogenic bile duct stenosis. Stenosis can lead to poor bile excretion, which in turn induces complications such as acute cholangitis, obstructive jaundice, and liver damage, with symptoms such as chills, fever, abdominal pain, and jaundice. In severe cases, it can even lead to shock. Long-term stenosis can lead to stone formation, which is an important disease that endangers human health. At present, the treatment options for bile duct stenosis include open hepatectomy, choledochojejunostomy; endoscopic bile duct stent placement, endoscopic balloon dilatation, endoscopic bile duct metal stent placement; percutaneous transhepatic bile duct puncture straight tube drainage, percutaneous transhepatic bile duct balloon dilatation, etc.

[0003] For high-risk patients such as the elderly, those with multiple underlying diseases, and those with cardiopulmonary dysfunction, the risk of radical surgery is relatively high, and the bile loss caused by PTCD is not easy for the body to recover, and the external drainage tube and balloon dilatation catheter carried are difficult to care for. Therefore, for bile duct stenosis, many hospitals currently use endoscopic ERCP to perform bile duct stent placement. The currently used bile duct stents include resin stents and metal stents. Among them, resin stents are thinner, and multiple resin stents need to be placed at the same time to reduce the recurrence rate of stenosis. However, it is difficult to place multiple resin stents through the narrow bile duct, and the resin stents that can be placed later are prone to displacement of the resin stents that were placed first; metal stents have a larger expansion diameter, and the recurrence rate of stenosis is lower than that of resin stents, but metal stents are generally used to treat extrahepatic bile duct stenosis, and the cost of metal stents is relatively high. Summary of the invention

[0004] According to the above-mentioned, the currently used bile duct stents include resin stents and metal stents, among which the resin stents are relatively thin, and multiple resin stents need to be placed at the same time to reduce the recurrence rate of stenosis, but it is difficult to place multiple resin stents through the stenotic bile duct, and the resin stents placed later can easily cause the displacement of the resin stents placed earlier; the metal stent has a larger expansion diameter, and the recurrence rate of stenosis is lower than that of the resin stent, but the metal stent is generally used for the treatment of extrahepatic bile duct stenosis, and the technical problem of the high cost of the metal stent is provided. An automatic expansion type bile duct stent for bile duct stenosis is provided. The present invention mainly utilizes the water-absorbing material on the concave tube wall to absorb water in the bile through the upper side holes of the tube wall and gradually expand, and the expanded water-absorbing material gradually fills the polyethylene film to form a cylindrical balloon to expand the stenotic bile duct.

[0005] The technical means adopted by the present invention are as follows:

[0006] A bile duct stent with automatic expansion for bile duct stenosis, wherein the bile duct stent is a single channel and comprises a head tube section, a body tube section and a tail tube section which are connected in sequence.

[0007] The head tube section and the tail tube section are in a straight line, a single pigtail or a sphere. The tube wall of the head tube section is provided with an elliptical side hole I and a side wing I, and the tube wall of the tail tube section is provided with an elliptical side hole II and a side wing II;

[0008] The outer wall of the body tube section is a concave tube wall, and an elliptical side hole is provided on the tube wall. The concave tube wall is wrapped with a columnar water-absorbing material and a polyethylene balloon membrane in sequence from the inside to the outside, and the two ends of the polyethylene balloon membrane are fixed to the tube wall of the body tube section through positioning rings;

[0009] A first channel is provided in the head tube segment, and the first channel is connected to the bile duct through the side hole I. A second channel is provided in the body tube segment, and a third channel is provided in the tail tube segment, and the third channel is connected to the bile duct through the side hole II. The first channel, the second channel and the third channel are sequentially interconnected; the water-absorbing material is connected to the second channel through the through hole provided on the concave tube wall, and the water-absorbing material gradually expands after absorbing water in the bile through the through hole, and gradually fills the polyethylene balloon membrane to form a cylindrical balloon to dilate the narrow bile duct.

[0010] Furthermore, the water-absorbing material is water-absorbing fiber, water-absorbing cotton or water-absorbing resin.

[0011] Furthermore, the bile duct stent has a length of 5-12 cm, an inner diameter of 6.5 Fr, and an outer diameter of 8.5 Fr.

[0012] Furthermore, the outer diameter of the concave tube wall is 7.5Fr.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] 1. The bile duct stenosis automatic dilatation type bile duct stent provided by the present invention has the advantages of simple placement, automatic dilatation of the stricture bile duct, reduced number of drainage tube replacements, shortened course of disease, and low manufacturing cost.

[0015] 2. The bile duct stent for bile duct stricture automatically expands and is provided with a water-absorbing material. The water-absorbing material absorbs water in the bile through the side holes of the tube wall and expands, and then fills the polyethylene balloon, which has the function of automatically and slowly expanding the stricture.

[0016] 3. The automatic expandable bile duct stent for bile duct stenosis provided by the present invention sets different maximum expansion diameters by the density of the water-absorbing material, and is suitable for the treatment of stenosis in various locations and at different degrees.

[0017] In summary, the technical solution of the present invention can solve the problem that the bile duct stents used in the prior art include resin stents and metal stents, wherein the resin stents are relatively thin and multiple resin stents need to be inserted at the same time to reduce the recurrence rate of stenosis, but it is difficult to insert multiple resin stents through the stenotic bile duct, and the resin stents inserted later can easily cause the displacement of the resin stents inserted earlier; the metal stent has a larger expansion diameter, and the recurrence rate of stenosis is lower than that of the resin stent, but the metal stent is generally used for the treatment of extrahepatic bile duct stenosis, and the cost of the metal stent is relatively high.

[0018] Based on the above reasons, the present invention can be widely promoted in the fields of minimally invasive medical technology and surgical instruments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 It is a schematic diagram of the structure of the automatic expandable bile duct stent for bile duct stenosis of the present invention.

[0021] Figure 2 It is a schematic diagram of the filling of the polyethylene membrane in the automatic expandable bile duct stent for bile duct stenosis of the present invention.

[0022] In the figure: 1, head tube section; 11, side wing I; 2, body tube section; 21, water-absorbing material; 22, polyethylene balloon membrane; 3, tail tube section; 31, side wing II; 4, side hole II; 5, positioning ring. DETAILED DESCRIPTION

[0023] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0026] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, the numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0027] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0028] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0029] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0030] like Figure 1-2 As shown, the present invention provides an automatic dilatation type bile duct stent for bile duct stenosis, wherein the bile duct stent is a single channel, comprising a head tube segment 1, a body tube segment 2 and a tail tube segment 3 which are sequentially connected from top to bottom. The length of the bile duct stent is 5-12 cm, the inner diameter is 6.5 Fr, and the outer diameter is 8.5 Fr.

[0031] The head tube section 1 and the tail tube section 3 are in a straight line, a single pigtail or a sphere. The tube wall of the head tube section 1 is provided with an elliptical side hole I and a side wing I11, and the tube wall of the tail tube section 3 is provided with an elliptical side hole II4 and a side wing II31. The side wing is a section of arc-shaped tube wall. When the side wing is formed, a side hole is left on the tube wall, which can drain bile and reduce the probability of head end blockage. The head side wing I11 can prevent the stent from falling off, and the tail side wing II31 can prevent the stent from shifting inside.

[0032] The outer wall of the body tube section 2 is a concave tube wall, and an elliptical side hole is provided on the tube wall (bile enters the tube cavity through the side hole, so as to drain the bile), and the columnar water-absorbing material 21 and the polyethylene balloon membrane 22 are wrapped on the concave tube wall from the inside to the outside, and the two ends of the polyethylene balloon membrane 22 are fixed to the tube wall of the body tube section 2 by positioning rings 5. The outer diameter of the concave tube wall is 7.5Fr.

[0033] The head tube section 1 is provided with a first channel, which is connected to the bile duct through the side hole I, the body tube section 2 is provided with a second channel, the tail tube section 3 is provided with a third channel, which is connected to the bile duct through the side hole II4, and the first channel, the second channel and the third channel are sequentially connected to each other; the water-absorbing material 21 is connected to the second channel through the through hole opened on the concave tube wall, and the water-absorbing material 21 gradually expands after absorbing water in the bile through the through hole, and gradually fills the polyethylene balloon membrane 22 to form a cylindrical balloon dilatation stenosis. Wherein, the water-absorbing material 21 is water-absorbing fiber, water-absorbing cotton or water-absorbing resin, etc.

[0034] After the duodenoscope is inserted orally and the bile duct cannulation is successful, the guide wire is inserted into the intrahepatic bile duct. Under the guidance of the guide wire, the bile duct stent and the pusher of the present invention are successively inserted, the bile duct stent is inserted into the narrow bile duct using the pusher, the guide wire is withdrawn to release the bile duct stent, and finally the pusher is withdrawn to complete the insertion of the bile duct stent. The water-absorbing material 21 on the concave tube wall of the bile duct stent of the present invention absorbs water in the bile through the side holes of the tube wall and gradually expands, and the expanded water-absorbing material 21 gradually fills the polyethylene balloon to form a cylindrical balloon, gradually expanding the narrow bile duct. The present invention is simple to insert, can automatically expand the narrow bile duct, reduce the number of drainage tube replacements, shorten the course of the disease, and has a low manufacturing cost.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention 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 solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An automatic expandable bile duct stent for bile duct stenosis, characterized in that: The bile duct stent is a single channel, comprising a head tube section (1), a body tube section (2) and a tail tube section (3) which are connected in sequence. The head tube section (1) and the tail tube section (3) are in a straight line, a single pigtail or a spherical shape. The tube wall of the head tube section (1) is provided with an elliptical side hole I and a side wing I (11), and the tube wall of the tail tube section (3) is provided with an elliptical side hole II (4) and a side wing II (31); The outer wall of the body tube section (2) is a concave tube wall, and an elliptical side hole is provided on the tube wall. The concave tube wall is wrapped with a columnar water-absorbing material (21) and a polyethylene balloon membrane (22) in sequence from the inside to the outside, and the two ends of the polyethylene balloon membrane (22) are fixed to the tube wall of the body tube section (2) by means of a positioning ring (5); The head tube section (1) is provided with a first channel, the first channel is connected to the bile duct through the side hole I, the body tube section (2) is provided with a second channel, the tail tube section (3) is provided with a third channel, the third channel is connected to the bile duct through the side hole II (4), and the first channel, the second channel and the third channel are sequentially connected to each other; the water-absorbing material (21) is connected to the second channel through the through hole formed on the concave tube wall, the water-absorbing material (21) absorbs water in the bile through the through hole and gradually expands, and gradually fills the polyethylene balloon membrane (22) to form a cylindrical balloon to dilate the narrow bile duct; The water-absorbing material (21) is water-absorbing fiber, water-absorbing cotton or water-absorbing resin; The bile duct stent has a length of 5-12 cm, an inner diameter of 6.5 Fr, and an outer diameter of 8.5 Fr.

2. The automatic expandable bile duct stent for bile duct stenosis according to claim 1, characterized in that: The outer diameter of the concave tube wall is 7.5Fr.

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