A surgically implantable biodegradable biliary stent

Abstract

The utility model relates to a kind of degradable biliary tract stents for surgery, including intestinal tract section pipe body, and the outer wall of one end of intestinal tract section pipe body is formed with barb outward;It further includes the biliary tract section pipe body of installation or injection molding at the opening of other end of intestinal tract section pipe body, and the outer wall of the end opening of biliary tract section pipe body is provided with several side holes;Biliary tract section pipe body is made of degradable material;Biliary tract section pipe body is made of X-ray perspective under visible material;The utility model divides the existing biliary tract stent into two parts fixed with each other, i. e. intestinal tract section pipe body and biliary tract section pipe body, and biliary tract section pipe body is made of degradable and X-ray perspective under visible material, while the length of intestinal tract section pipe body remaining in body is greatly reduced, can be automatically slipped without obstruction, so that patient does not need to arrange ERCP to remove biliary tract stent after biliary tract stent placement surgery, in turn greatly alleviate the pain of patient, while simplifying treatment procedure, reduce treatment cost.

Description

Technical Field

[0001] This utility model relates to a biodegradable biliary stent for surgical use. Background Technology

[0002] Common bile duct stones are a common and frequently occurring disease in my country. Most cases are accompanied by gallbladder stones and can cause acute and chronic cholangitis, systemic infection, liver damage, and biliary pancreatitis, which can be life-threatening in severe cases.

[0003] Treatment for common bile duct stones remains primarily surgical, with laparoscopic common bile duct exploration (LCBDE) being the most common surgical procedure. During the procedure, the common bile duct is first cut open, and a T-tube is used for external bile drainage to drain bile, prevent bile leakage, and prevent biliary stricture. However, patients need to undergo a second surgery 1-3 months post-surgery to remove the T-tube, making the procedure quite complex. Furthermore, the presence of the T-tube post-surgery causes physical pain and inconvenience, and increases treatment costs. In addition, significant bile loss can lead to water, electrolyte, and bile salt imbalances, resulting in indigestion. The longer the T-tube remains in place, the greater the risk of retrograde infection.

[0004] Therefore, in the current treatment of common bile duct stones, self-slipping plastic stents are gradually being used to replace "T" tubes. However, in order for the plastic stent to slip off automatically, it must be trimmed before implantation. However, trimming cannot guarantee that the plastic stent will definitely slip off automatically, and the probability of the plastic stent not slipping off automatically is still relatively high. Patients whose plastic stents do not slip off automatically still need to undergo endoscopic retrograde cholangiopancreatography (ERCP) to remove the plastic stent after surgery, which will still increase the patient's pain and treatment costs, and further improvements are needed. Utility Model Content

[0005] In view of the current state of the prior art, the technical problem to be solved by this utility model is to provide a biodegradable surgical stent that eliminates the need for ERCP to remove the biliary stent after biliary stent placement surgery, thus greatly reducing patient suffering, while simplifying the treatment process and reducing treatment costs.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is: a biodegradable biliary stent for surgical use, characterized in that: it includes an intestinal segment tube body, and barbs are formed on the outer wall of one end of the intestinal segment tube body outward; It also includes a bile duct segment tube installed or injection molded at the opening at the other end of the intestinal segment tube, wherein a number of side holes are provided on the outer wall at the end opening of the bile duct segment tube. The bile duct segment is made of biodegradable material; The bile duct segment is made of a material that is radiopaque under X-ray fluoroscopy.

[0007] Preferably, the degradation time of the bile duct segment is 1 to 2 months.

[0008] Preferably, a circumferentially arranged conical surface is formed on the outer wall of the end opening of the biliary segment.

[0009] Preferably, when the biliary segment tube is fixed, a sleeve is formed outward at the opening of the intestinal segment tube near the biliary segment tube, and the opening at the root of the biliary segment tube is fitted over the sleeve.

[0010] Preferably, the edge of the root opening of the bile duct segment tube is connected to the edge of the opening at one end of the intestinal segment tube to which the bile duct segment tube is fixed.

[0011] Preferably, the outer wall of the sleeve has a plurality of protrusions arranged along the sleeve axis and evenly distributed at equal angles along the circumferential direction. Correspondingly, the inner wall of the root opening of the bile duct segment is provided with the same number of slots evenly distributed at equal angles along the circumferential direction, and each protrusion is embedded in a corresponding slot.

[0012] Preferably, each of the protruding strips has a bevel formed at the outer corner of one end near the bile duct segment.

[0013] Compared with the prior art, the advantages of this utility model are as follows: This utility model divides the existing biliary stent into two mutually fixed parts, namely the intestinal segment tube and the biliary segment tube. The biliary segment tube is made of a biodegradable material that is visible under X-ray fluoroscopy, so that the biliary segment tube will degrade and disappear on its own within 1 to 2 months after the operation. At the same time, the length of the intestinal segment tube remaining in the body is greatly reduced, and it can automatically slip out without any obstruction. Therefore, patients do not need to have ERCP to remove the biliary stent after the biliary stent placement surgery, which greatly reduces the patient's pain. At the same time, it simplifies the treatment steps and reduces the treatment cost. Attached Figure Description

[0014] The above and other features, advantages, and aspects of the embodiments of this application will become more apparent when taken in conjunction with the accompanying drawings and the following detailed description; throughout the drawings, the same or similar reference numerals denote the same or similar elements; it should be understood that the drawings are schematic, and the originals and elements are not necessarily drawn to scale; in the drawings: Figure 1 This is an exploded structural diagram of the present invention. Detailed Implementation

[0015] Unless otherwise defined, the technical or scientific terms used in this utility model shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0016] To keep the following description of the embodiments of this utility model clear and concise, detailed descriptions of known functions and known components are omitted.

[0017] like Figure 1 As shown, a biodegradable biliary stent for surgical use includes an intestinal segment tube 1, with barbs 11 formed outwardly on the outer wall of one end of the intestinal segment tube 1. It also includes a bile duct segment 2 installed or injection molded at the opening at the other end of the intestinal segment 1, and a number of side holes 21 are provided on the outer wall at the end opening of the bile duct segment 2. Biliary segment 2 is made of biodegradable material; The bile duct segment 2 is made of a material that can be visualized under X-ray fluoroscopy.

[0018] The degradation time of bile duct segment 2 is 1 to 2 months.

[0019] The outer wall of the end opening of the bile duct segment 2 has a circumferentially arranged conical surface 22 to facilitate insertion into the patient's bile duct.

[0020] When the bile duct segment tube 2 is installed, a sleeve 12 is formed outward at the opening of the intestinal segment tube 1 near the bile duct segment tube 2, and the opening at the root of the bile duct segment tube 2 is fitted onto the sleeve 12.

[0021] The edge of the root opening of the bile duct segment 2 is connected to the edge of the opening at one end of the intestinal segment 1 where the bile duct segment 2 is fixed.

[0022] The outer wall of the sleeve 12 has a number of protrusions 13 that are arranged axially along the sleeve 12 and evenly distributed at equal angles along the circumference. Correspondingly, the inner wall of the root opening of the bile duct segment tube 2 has the same number of slots 23 that are evenly distributed at equal angles along the circumference. Each protrusion 13 is embedded in a corresponding slot 23 to prevent the bile duct segment tube 2 from detaching from the intestinal segment tube 1 and to prevent the bile duct segment tube 2 from rotating relative to the intestinal segment tube 1.

[0023] Each protrusion 13 has a bevel 14 formed at the outer corner of one end near the bile duct segment 2 so that the protrusion 13 can be accurately and quickly embedded into the slot 23.

[0024] Working principle: When ERCP is used to remove stones from the common bile duct, the patient's common bile duct is first cut open, and then the end of the bile duct segment 2 is inserted into the common bile duct using the conical surface 22. Then, the end of the intestinal segment 1 that is not fixed to the bile duct segment 2 is inserted into the patient's intestine, and then suturing can be performed. The barb 11 extends into the intestine and is fastened to the outside of the common bile duct connection, which can prevent the intestinal segment 1 and the bile segment 2 from shifting. The side hole 21 allows bile to enter and exit.

[0025] Because the bile duct segment 2 is made of a biodegradable material that is visible under X-ray fluoroscopy, it will be decomposed and disappear by the body's tissue fluid within 1 to 2 months after the operation, leaving only the intestinal segment 1 located in the intestine. If the bile duct segment 2 is not found when the area is irradiated with X-ray medical fluoroscopy equipment, it indicates that the bile duct segment 2 has been completely degraded. Subsequently, the intestinal segment 1 can be removed with the help of other minimally invasive tools such as gastroscopy and colonoscopy, without the need for further surgery. The barb 11 facilitates the automatic slippage of the bile duct stent.

[0026] This invention divides the existing biliary stent into two mutually fixed parts: an intestinal segment tube 1 and a biliary segment tube 2. The biliary segment tube 2 is made of a biodegradable material that is radiopaque under X-ray fluoroscopy, allowing it to degrade and disappear spontaneously within 1-2 months post-surgery. Simultaneously, the length of the remaining intestinal segment tube 1 is significantly reduced, allowing for unimpeded automatic detachment. This eliminates the need for ERCP to remove the biliary stent after placement surgery, greatly reducing patient discomfort, simplifying treatment procedures, and lowering costs.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A biodegradable biliary stent for surgical use, characterized in that: It includes an intestinal segment tube, with barbs forming outwards on the outer wall of one end of the intestinal segment tube; It also includes a bile duct segment tube installed or injection molded at the opening at the other end of the intestinal segment tube, wherein a number of side holes are provided on the outer wall at the end opening of the bile duct segment tube. The bile duct segment is made of biodegradable material; The bile duct segment is made of a material that is radiopaque under X-ray fluoroscopy.

2. The biodegradable biliary stent for surgical use according to claim 1, characterized in that, The degradation time of the bile duct segment is 1 to 2 months.

3. The biodegradable biliary stent for surgical use according to claim 1, characterized in that, A circumferentially arranged conical surface is formed on the outer wall of the end opening of the biliary segment.

4. The biodegradable biliary stent for surgical use according to claim 1, characterized in that, When the biliary segment tube is installed, a sleeve is formed outward at the opening of the intestinal segment tube near the biliary segment tube, and the opening at the root of the biliary segment tube is fitted over the sleeve.

5. A biodegradable surgical stent according to claim 4, characterized in that, The edge of the root opening of the bile duct segment connects with the edge of the opening at one end of the intestinal segment where the bile duct segment is fixed.

6. A biodegradable biliary stent for surgical use according to claim 4, characterized in that, The outer wall of the sleeve has several protrusions that are arranged along the sleeve axis and evenly distributed at equal angles along the circumference. Correspondingly, the inner wall of the root opening of the bile duct segment is provided with the same number of slots that are evenly distributed at equal angles along the circumference. Each protrusion is embedded in a corresponding slot.

7. A biodegradable surgical stent according to claim 6, characterized in that, Each of the aforementioned protrusions has a bevel formed at the outer corner of one end near the bile duct segment.

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