Anchoring type pancreatic stump anastomosis covered stent with cap-shaped buffer membrane structure

Abstract

The utility model discloses an anchoring type pancreatic stump anastomosis covered stent with a cap-shaped buffer membrane structure, which comprises a covered stent tube and a cap-shaped buffer membrane, and the cap-shaped buffer membrane is seamlessly combined with the covered stent tube. High-risk intestinal tract (stomach)-main pancreatic duct anastomosis is converted into a double anastomosis mode of low-risk cap-shaped buffer film-intestinal tract (stomach) anastomosis and high-risk intestinal tract (stomach)-main pancreatic duct anastomosis. Even if the intestinal tract (stomach) and the main pancreatic duct are anastomosed and cracked, as long as the membrane barrier between the buffer membrane and the intestinal tract (stomach) is not broken, pancreatin can still be kept in the covered stent to flow into the gastrointestinal tract, so that pancreatic fistula is completely eradicated.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to an anchored pancreatic stump anastomosis covered stent with a cap-shaped buffer membrane structure. Background Art

[0002] Anastomosis of the pancreatic stump after partial pancreatectomy has been a medical problem for a century. In medicine, the pancreatic stump anastomosis technique is most commonly used in pancreaticoduodenectomy, which is the most commonly used surgical method for injuries and tumors of the duodenum, lower bile duct, pancreatic head (including the pancreatic uncinate process) and duodenal ampulla; or anastomosis of the pancreatic stump after partial pancreatectomy.

[0003] So far, the anastomosis methods of the pancreatic stump can be divided into two types: first, pancreas-stomach anastomosis; second, pancreas-small intestine anastomosis. There are also two methods for pancreaticojejunal anastomosis: first, the binding anastomosis method; second, the pancreatic duct-mucosa end-to-side anastomosis of the pancreas-small intestine; and many improved methods have been derived on the basis of the above. However, no matter which anastomosis method is used, because the tissue morphology of the pancreas is completely different from that of the gastrointestinal tract, the probability of failure of pancreaticogastric or pancreaticojejunal anastomosis is very high. The rupture of the anastomosis means that pancreatic enzymes, even combined with small intestinal fluid and bile, pass through the anastomosis and enter the abdominal cavity, that is, pancreatic fistula occurs. According to our latest scientific research progress, it is found that the root cause of the failure of the pancreatic stump anastomosis comes from the high biological activity of the pancreatic parenchyma. After the unavoidable physical damage such as cutting and suturing of the pancreatic stump, or even chemical damage such as reflux pancreatitis, the pancreatic stump edema and inflammatory reaction occur, which leads to increased tension and rupture of the anastomosis. Therefore, to date, no pancreatic stump anastomosis method can guarantee that the anastomosis will not crack.

[0004] During the operation, doctors often choose a suitable support tube according to the diameter of the main pancreatic duct. However, so far, there is no widely used professional pancreatic stump anastomosis support tube. Most doctors will use local materials, such as infusion tubes, urinary catheters, etc. Individual customized support tubes and stents are just ordinary catheters that play a drainage role. There is no in-depth research and design from the mechanism of pancreatic fistula. The currently recognized factors for the failure of pancreaticojejunostomy are the diameter of the main pancreatic duct <3mm and the softness of the pancreatic parenchyma. However, all the current anastomosis methods will not adopt different methods due to different patient conditions. On the contrary, it is more recommended to choose an anastomosis method that the surgeon is familiar with, and a surgeon is usually only proficient in using one anastomosis method.

[0005] In short, anastomotic inflammation and edema are unavoidable, and people traditionally believe that anastomotic dehiscence means pancreatic fistula. According to current understanding, as long as the pancreatic stump is anastomosed, no matter which method is used, pancreatic fistula cannot be avoided. The patent application utilizes a specially designed anchored pancreatic stump anastomosis covered stent with a cap-like buffer membrane structure to block the connection between anastomotic dehiscence and pancreatic fistula - even if anastomotic dehiscence occurs, pancreatic fistula will not occur. Utility Model Content

[0006] In view of the deficiencies of the prior art, the utility model provides an anchored pancreatic stump anastomosis covered stent with a cap-shaped buffer membrane structure, which solves the problem of pancreatic fistula that cannot be avoided in the current pancreatic stump anastomosis surgery.

[0007] To achieve the above purpose, the utility model is implemented by the following technical scheme: An anchored pancreatic stump anastomosis covered stent with a cap-shaped buffer membrane structure, comprising: a covered stent tube 1 and a cap-shaped buffer membrane 2, wherein the cap-shaped buffer membrane 2 is seamlessly combined with the molded structure of the covered stent tube 1, and one end of the covered stent tube 1 is a fully covered covered end 3, and the other end is a bare stent end 4. The covered stent tube and the cap-shaped buffer membrane are seamlessly combined, and the inside is a pancreatic enzyme flow channel.

[0008] Preferably, the cap-shaped buffer membrane 2 is provided with an anchoring ring 5 and a double-layer buffer membrane 6, the double-layer buffer membrane 6 includes a double-layer buffer membrane combining end 7 and a double-layer buffer membrane anchoring end 8, wherein the double-layer buffer membrane combining end 7 is seamlessly connected to the coated end 3 of the coated stent, and the double-layer buffer membrane anchoring end 8 is seamlessly connected to the anchoring ring 5 by integrated injection molding.

[0009] The utility model provides an anchored pancreatic stump anastomosis covered stent with a cap-shaped buffer membrane structure, which has the following beneficial effects:

[0010] 1: Select covered stents of different specifications (diameters) according to the diameter of the main pancreatic duct. The outer diameter of the selected covered stent after release is larger than the diameter of the corresponding main pancreatic duct. During the operation, it is placed in the main pancreatic duct and released. The outer membrane of the covered stent adheres to the inner wall of the main pancreatic duct to block the flow of pancreatic enzymes into the abdominal cavity through the gap. The inner cavity is the channel for the flow of pancreatic enzymes in the pancreatic stump; the cap-shaped buffer membrane is placed in the small intestine (stomach) cavity during the operation, and the anchoring ring is anchored to the inner side of the small intestine (stomach) wall by sutures. When the tension of the pancreaticojejunostomy (gastric) is high or even cracked, the membrane structure will buffer the tension of the anastomosis due to its own extensibility and will not crack. The membrane structure prevents pancreatic enzymes from flowing into the abdominal cavity from the pancreatic duct, and prevents pancreatic fistula after pancreaticojejunostomy.

[0011] This technology will select different diameters of anchored pancreatic stump anastomosis covered stents with cap-shaped buffer membrane structures according to the main pancreatic duct, and transform the high-risk intestinal (stomach)-main pancreatic duct anastomosis into a low-risk cap-shaped stretchable membrane-intestinal (stomach) anastomosis + high-risk intestinal (stomach)-main pancreatic duct anastomosis. Even if the intestinal (stomach)-main pancreatic duct anastomosis is broken, as long as the membrane barrier between the cap-shaped buffer membrane-intestinal (stomach) is not damaged, pancreatic enzymes will still maintain the flow of the main pancreatic duct-covered stent-gastrointestinal tract. In other words, even if the pancreaticojejunostomy in the traditional sense is broken, pancreatic fistula will not occur. In this way, the traditional logical relationship between pancreaticojejunostomy (stomach) anastomosis and pancreatic fistula is interrupted. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the pancreatic stump anastomosis covered stent with an anchored cap-shaped buffer membrane structure in a non-stretched state after release.

[0013] Figure 2 This is a schematic diagram of the pancreatic stump anastomosis covered stent with an anchored cap-shaped buffer membrane structure in a stretched state after release.

[0014] Figure 3 This is the state of the pancreatic stump anastomosis covered stent with an anchored cap-shaped buffer membrane structure after intraoperative placement.

[0015] Figure 4 The state after anastomotic dehiscence occurs in the pancreatic stump anastomosis covered stent with an anchored cap-shaped buffer membrane structure.

[0016] In the figure: 1. coated stent tube; 2. cap-shaped buffer membrane; 3. coated end of coated stent; 4. bare stent end of coated stent; 5. cap-shaped buffer membrane anchoring ring; 6. cap-shaped buffer membrane and double-layer buffer membrane; 7. double-layer buffer membrane combining end; 8. double-layer coated stent anchoring end. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] See also Figure 1-2The utility model provides a technical solution: an anchored pancreatic stump anastomosis covered stent with a cap-shaped buffer membrane structure, comprising: a covered stent tube 1 and a cap-shaped buffer membrane 2. One end of the covered stent tube 1 is a fully covered covered end 3, and the other end is a bare stent end 4; the cap-shaped buffer membrane 2 is provided with an anchor ring 5 and a double-layer buffer membrane 6, and the double-layer buffer membrane 6 includes a double-layer buffer membrane combination end 7 and a double-layer buffer membrane anchoring end 8, wherein the double-layer buffer membrane combination end 7 is seamlessly connected to the covered stent covered end 3, and the double-layer buffer membrane anchoring end 8 is seamlessly connected to the anchor ring 5 by integrated injection molding.

[0019] Different specifications of the covered stent tube 1 are selected according to the diameter of the main pancreatic duct. The outer diameter of the covered stent tube 1 of the selected stent needs to be larger than the diameter of the main pancreatic duct. The covered stent tube 1 is in a compressed state before being inserted into the main pancreatic duct, and is placed in the main pancreatic duct and released during the operation. Because the outer diameter of the covered stent tube 1 needs to be larger than the diameter of the main pancreatic duct, the outer surface of the covered stent tube 1 is tightly combined with the inner wall of the main pancreatic duct, preventing pancreatic enzymes from the pancreatic stump from flowing into the abdominal cavity through the gap between the two. At the same time, the friction between the covered stent tube 1 and the inner wall of the main pancreatic duct prevents the covered stent tube 1 and the main pancreatic duct from relative displacement.

[0020] The cap-shaped buffer membrane 2 is placed in the small intestine (stomach) cavity during the operation, and the anchor ring 5 of the buffer membrane is anchored to the inner side of the small intestine (stomach) cavity by suture; the suturing method is multi-point suturing, closing the gap between the anchor ring 5 and the small intestine (stomach) wall to prevent pancreatic enzymes from flowing into the abdominal cavity from the gap; the double-layer buffer membrane 6 of the cap-shaped buffer membrane is an elastic material and is very easy to stretch; when the pancreaticojejunostomy (gastric) anastomosis is edematous and cracked, because the coated stent tube 1 has been fixed in the main pancreatic duct, and the cap-shaped buffer membrane 2 has also been anchored on the inner wall of the small intestine (stomach) cavity with the help of the anchor ring 5, the only thing that can be deformed by force is the cap-shaped buffer membrane 3 because of its own extensible characteristics, which buffers the tension of the anastomosis and will not crack, and there is still a membrane structure to prevent pancreatic enzymes from flowing into the abdominal cavity from the pancreatic duct, and prevent pancreatic fistula after pancreaticojejunostomy. The inner cavity of the coated stent tube 1 and the inner cavity of the cap-shaped buffer membrane 2 are the channels for pancreatic enzymes to circulate in the pancreatic stump.

[0021] By those skilled in the art, the components in this case are connected and assembled in sequence. The specific connection and operation sequence should refer to the following working principle. The detailed connection means are well-known technologies in the field. The following mainly introduces the working principle and process.

[0022] Example: By Figure 1-3As shown, when in use, after the pancreatic stump and the small intestine (stomach) anastomosis surface are prepared, one end of the covered stent of the pancreatic stump anastomosis stent with a cap-shaped buffer membrane structure in a gripped state is placed in the main pancreatic duct and then released; a small incision (about 5 mm) is made in the small intestine (stomach) and then the cap-shaped buffer membrane is placed in the small intestine (stomach) cavity, and the anchor ring 5 is sutured and anchored to the inner wall of the small intestine (stomach) by sutures at multiple points (solid line in the figure), and this suture is the inner layer suture; then, the main pancreatic duct of the pancreas is anastomosed with the small intestine (stomach) wall at multiple points (dashed line in the figure), and the suture here is the outer layer suture. The outer layer suture here is the traditional main pancreatic duct-small intestine (stomach) anastomosis, which is very fragile. When the pancreaticojejunostomy (gastric) anastomosis swells and cracks, because the coated stent tube 1 has been fixed in the main pancreatic duct, and the cap-shaped buffer membrane 2 has also been anchored on the inner wall of the small intestine (stomach) cavity with the help of the anchoring ring 5, the only part that can be deformed by the force is the cap-shaped buffer membrane 3, which has its own extensible characteristics and buffers the tension of the anastomosis without cracking. The membrane structure still prevents pancreatic enzymes from flowing into the abdominal cavity from the pancreatic duct, thereby preventing pancreatic fistula from occurring after pancreaticojejunostomy.

[0023] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions. The sentence "includes an element defined by ... does not exclude the existence of other identical elements in the process, method, article or device including the element".

[0024] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An anchored pancreatic stump anastomosis covered stent with a cap-shaped buffer membrane structure, characterized in that: include: A coated stent tube (1) and a cap-shaped buffer membrane (2), wherein the cap-shaped buffer membrane (2) is seamlessly combined with the molded structure of the coated stent tube (1), and one end of the coated stent tube (1) is a fully coated coated end (3), and the other end is a bare stent end (4); The cap-shaped buffer membrane (2) is provided with an anchoring ring (5) and a double-layer buffer membrane (6), the double-layer buffer membrane (6) comprises a double-layer buffer membrane combining end (7) and a double-layer buffer membrane anchoring end (8), the double-layer buffer membrane combining end (7) is seamlessly connected to the coated end (3) of the coated stent, and the double-layer buffer membrane anchoring end (8) is seamlessly connected to the anchoring ring (5) by integral injection molding.

Images