Gall bladder stent

Abstract

The utility model provides a gall bladder stent which is characterized in that the gall bladder stent comprises a stent body, the stent body can contract in the radial direction so that the stent body can penetrate through a duodenal papilla opening to enter a gall bladder opening, and the stent can be expanded in the radial direction so that the stent body can expand a common bile duct and a gall bladder duct and enter the gall bladder opening; the outer diameter of the stent body is gradually reduced from the near end to the far end, and the section is circular. The gall bladder stent is placed into a body through a special conveyor, and the released gall bladder stent covers a gall bladder opening, a gall bladder tube and a common bile duct, so that a channel for surgical instruments to go in and out is formed in the stent body, instruments such as a biliary tract sub-endoscope can enter the gall bladder conveniently to carry out lithotripsy and lithotripsy, stones in the gall bladder are taken out, and the gall bladder does not need to be cut off.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a gallbladder stent. Background Art

[0002] Gallstones are a common type of cholelithiasis. Except for a small number of asymptomatic gallstones that can be followed up and observed, most gallstones require surgical treatment. The surgery for gallstones is cholecystectomy, which can be roughly divided into two types, one is open surgery, and the other is minimally invasive surgery, mainly laparoscopic surgery. During gallbladder surgery, the relationship between important structures such as the cystic duct, common bile duct, common hepatic duct, left and right hepatic ducts should be clearly identified, and then the gallbladder blood vessels should be severed, and then the cystic duct should be ligated and cut off, and finally the gallbladder should be removed from the gallbladder bed of the liver. Because the gallbladder is a very important digestive and immune organ in the human body, removing the gallbladder will bring many side effects, such as indigestion, diarrhea and bloating, bile reflux gastritis, common bile duct stone formation, and even increase the risk of colon cancer.

[0003] Therefore, there is a need to provide a gallbladder stent to alleviate the technical problem in related technologies that most gallbladder stones require surgical resection. Utility Model Content

[0004] The utility model aims to provide a gallbladder stent to alleviate the technical problem that most gallbladder stones in the related art need to be removed by surgical treatment.

[0005] According to one aspect of the utility model, a gallbladder stent includes a stent body, which can be radially contracted so that the stent body can pass through the duodenal papilla opening and enter the gallbladder opening, and the stent body can be radially expanded so that the stent body can expand the common bile duct and the cystic duct and enter the gallbladder opening; the outer diameter of the stent body gradually decreases from the proximal end to the distal end, and the cross-section is circular.

[0006] Preferably, the proximal outer diameter of the stent body is 8-10 mm, and the distal outer diameter of the stent body is 3-4 mm.

[0007] Preferably, the stent body is formed by braiding wires, the proximal braiding density of the stent body is 40-50 PPI, and the distal braiding density of the stent body is 20-25 PPI.

[0008] Preferably, the braided wire is nickel-titanium alloy.

[0009] Preferably, the braided wire has a diameter of 0.06-0.10 mm.

[0010] Preferably, development marks are respectively provided at the distal end and the proximal end of the stent body.

[0011] Preferably, a connecting coil is provided at the proximal end of the stent body.

[0012] Preferably, both ends of the bracket body are connected with openings, and the diameter of the openings gradually increases from the end connected to the bracket body to the end away from the bracket body.

[0013] Preferably, a support structure is provided at the distal end of the stent body.

[0014] The gallbladder stent of the utility model is inserted into the body through a special conveyor, and the released gallbladder stent covers the gallbladder opening, cystic duct and common bile duct, thereby forming a passage for surgical instruments to enter and exit inside the stent body, which is convenient for instruments such as choledochoscopes to enter the gallbladder for lithotripsy and remove stones in the gallbladder without removing the gallbladder. In addition, it can also be used for gallbladder polypectomy and gallbladder biopsy through the natural cavity. The passage formed by the gallbladder stent body also prevents larger stones in the gallbladder from being discharged and blocking the cystic duct or common bile duct. During in vitro lithotripsy or cholepancreatoscope laser lithotripsy, the inserted gallbladder stent can ensure the patency of the gallbladder opening, cystic duct and common bile duct. After lithotripsy, it can be inserted into the nasobiliary duct under the guidance of a guide wire through the passage of the gallbladder stent for flushing with liquid medicine and negative pressure to remove stones in the gallbladder. At the same time, the proximal end of the gallbladder stent body is located in the duodenal papillary sphincter. The gallbladder stent body has no effect on the duodenal papillary sphincter. The papillary sphincter can be automatically opened / closed according to human physiological needs. The gallbladder stent will not affect the bile gathering in the gallbladder. The gathered bile can further dilute the gallbladder stones. The connection coil at the proximal end of the gallbladder stent body can expose the outside of the papillary sphincter. After the gallbladder stones are removed, the gallbladder stent can be removed from the body through the connection coil at the proximal end of the gallbladder stent body with tools such as biopsy forceps or foreign body forceps. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the structure of the gallbladder stent. DETAILED DESCRIPTION

[0016] In order to facilitate the understanding of the present application, in order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application, and the preferred embodiments of the present application are given in the accompanying drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thoroughly understood. The present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0017] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In the description of the present application, the meaning of "several" is at least one, such as one, two, etc., unless otherwise clearly and specifically defined. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present application. The terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0018] In this article, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components.

[0019] For ease of description, in this specification, the end of the inner tube along its length, when in use, away from the operator is defined as the distal end, that is, the front end, and the end held by the operator is the proximal end, that is, the rear end.

[0020] The embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings of the specification.

[0021] like Figure 1 As shown, the gallbladder stent for gallbladder stone removal provided by the utility model includes a stent body 200, the stent body 200 can be radially contracted so that the stent body 200 can pass through the duodenal papilla and enter the gallbladder opening, and the stent body 200 can be radially expanded so that the stent body 200 can expand the common bile duct and the cystic duct and enter the gallbladder opening; the outer diameter of the stent body 200 gradually decreases from the proximal end to the distal end, and the cross-section is circular, and a temporary channel is established between the gallbladder and the duodenal papilla. The length of the stent body 200 when expanded in an in vitro normal temperature environment ranges from 10cm to 12cm.

[0022] Specifically, the outer diameter of the proximal end of the stent body 200 is 8-10mm, and the outer diameter of the distal end of the stent body 200 is 3-4mm. The stent body 200 is woven by braided wire, the braiding density of the proximal end of the stent body 200 is 40-50PPI, and the braiding density of the distal end of the stent body 200 is 20-25PPI. Preferably, the stent body 200 can be woven by nickel-titanium alloy wire to form a stent body 200 of an integral structure, and the diameter of the braided wire is 0.06-0.10mm. The distal and proximal ends of the stent body 200 are respectively provided with developing marks, and the material of the developing marks is platinum-iridium alloy, gold or tantalum. A connecting coil 300 is provided at the proximal end of the stent body 200, and the connecting coil can expose the outside of the papillary sphincter. After the gallbladder stones are removed, the gallbladder stent can be removed from the body by using tools such as biopsy forceps or foreign body forceps through the connecting coil at the proximal end of the gallbladder stent body. Both ends of the stent body 200 are connected with openings 400, and the diameter of the openings 400 gradually increases from the end connected to the stent body 200 to the end away from the stent body 200. A support structure is provided at the distal end of the stent body 200 so that the distal end of the stent body 200 is fixed near the gallbladder opening, and the stent body 200 sequentially covers the cystic duct and the common bile duct, and keeps the gallbladder, the cystic duct and the common bile duct passages unobstructed.

[0023] The gallbladder stent provided by the utility model is placed in a special inserter, so that the inserter can pass through the common bile duct, cystic duct, spiral folds and gallbladder neck of the patient more smoothly, and enter the gallbladder opening, and then the stent body 200 is placed, and a temporary channel is established between the gallbladder and the duodenal papilla, so as to form a channel for surgical instruments to enter and exit inside the stent body 200, so as to facilitate the entry of instruments such as choledochoscopes into the gallbladder for lithotripsy and remove stones in the gallbladder without the need to remove the gallbladder. In addition, it can also be applied to gallbladder polypectomy and gallbladder biopsy through natural cavities. The channel formed by the gallbladder stent body also prevents the discharge of larger stones in the gallbladder and blocks the cystic duct or common bile duct. During in vitro lithotripsy or cholepancreatoscope laser lithotripsy, the inserted gallbladder stent can ensure the smooth flow of the gallbladder opening, cystic duct and common bile duct. After lithotripsy, it can be placed in the nasobiliary duct under the guidance of a guide wire through the channel of the gallbladder stent for liquid flushing and negative pressure to remove stones in the gallbladder. At the same time, the proximal end of the gallbladder stent body is located in the duodenal papillary sphincter. The gallbladder stent body has no effect on the duodenal papillary sphincter. The papillary sphincter can be automatically opened / closed according to human physiological needs. The gallbladder stent will not affect the bile gathering in the gallbladder. The gathered bile can further dilute the gallbladder stones. The connection coil at the proximal end of the gallbladder stent body can expose the outside of the papillary sphincter. After the gallbladder stones are removed, the gallbladder stent can be removed from the body through the connection coil at the proximal end of the gallbladder stent body with tools such as biopsy forceps or foreign body forceps.

[0024] It will be apparent to those skilled in the art that various modifications and variations may be made to the above exemplary embodiments of the present invention without departing from the spirit and scope of the present invention. Therefore, it is intended that the present invention covers modifications and variations of the present invention that fall within the scope of the appended claims and their equivalent technical solutions.

Claims

1. A gallbladder stent, characterized in that: The invention comprises a stent body (200), wherein the stent body (200) can be radially contracted so that the stent body (200) can pass through the duodenal papilla opening and enter the gallbladder opening, and the stent body (200) can be radially expanded so that the stent body (200) can expand the common bile duct and the cystic duct and enter the gallbladder opening; the outer diameter of the stent body (200) gradually decreases from the proximal end to the distal end, and the cross section is circular.

2. The gallbladder stent according to claim 1, characterized in that: The proximal outer diameter of the stent body (200) is 8-10 mm, and the distal outer diameter of the stent body (200) is 3-4 mm.

3. The gallbladder stent according to claim 1, characterized in that: The stent body (200) is formed by braiding braided wires, the proximal braiding density of the stent body (200) is 40-50 PPI, and the distal braiding density of the stent body (200) is 20-25 PPI.

4. The gallbladder stent according to claim 3, characterized in that: The braided wire is a nickel-titanium alloy.

5. The gallbladder stent according to claim 4, characterized in that: The braided wire has a diameter of 0.06-0.10 mm.

6. The gallbladder stent according to claim 1, characterized in that: The distal end and the proximal end of the stent body (200) are respectively provided with development marks.

7. The gallbladder stent according to claim 1, characterized in that: A connecting coil (300) is disposed at the proximal end of the stent body (200).

8. The gallbladder stent according to claim 1, characterized in that: Both ends of the bracket body (200) are connected to openings (400), and the diameter of the openings (400) gradually increases from the end connected to the bracket body (200) to the end away from the bracket body (200).

9. The gallbladder stent according to claim 1, characterized in that: A support structure is arranged at the distal end of the stent body (200).

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