A direct removal type bile and pancreatic drainage tube

Abstract

The present invention provides a direct removal type bile and pancreatic drainage tube. The present invention includes: a nasobiliary drainage tube and a pancreatic duct drainage tube, and also includes a traction tube and a traction line. The traction tube is connected to one end of the traction line. The traction line passes through the nasobiliary drainage tube and is connected to the tail end of the pancreatic duct drainage tube. After the bile and pancreatic drainage tube is placed in the human body, the head of the nasobiliary drainage tube extends into the right hepatic duct, and the bile drainage hole of the drainage part is close to the primary tube wall of the duodenum. The bile drainage hole includes a middle hole and triangular holes connected to the middle hole and arranged on the left and right sides of the middle hole. The nasobiliary drainage tube of the present invention can be used as a propeller to push the pancreatic duct drainage tube into the pancreatic duct. In the process of pulling out the nasobiliary drainage tube, when passing through the duodenal papilla, the tube walls on both sides of the bile drainage hole are close to each other to form a smaller loop, which is easier to pass through the duodenal papilla. When the nasobiliary drainage tube is taken out, the pancreatic drainage tube can be taken out at the same time by pulling the traction line.

Description

Technical Field

[0001] The invention relates to a drainage tube, in particular to a direct removal type bile and pancreatic fluid drainage tube. Background Art

[0002] Endoscopic retrograde cholangiopancreatography (ERCP) is currently an important measure for the treatment of hepatobiliary and pancreatic diseases, including common bile duct stones, bile duct injury, bile duct stenosis, and biliary complications after liver transplantation. Compared with traditional open surgery, this technology has the advantages of less trauma, higher safety factor, and faster recovery. Its direct observation can detect hepatobiliary and pancreatic diseases that cannot be found by conventional hepatobiliary spleen and pancreas CT, ultrasound, and magnetic resonance imaging, and treat them at the same time, such as duodenal papillitis, papillary stenosis, parapapillary diverticulum, duodenal papillae are too long, and bile and pancreatic junction abnormalities. However, there are complications such as acute cholangitis, acute pancreatitis, and delayed bleeding after ERCP.

[0003] Endoscopic nasobiliary drainage is a routine technique in ERCP operations and can be directly used to treat obstructive jaundice, acute suppurative cholangitis, bile leakage and other diseases. Postoperative retention of a nasobiliary drainage tube can fully drain bile, reduce bile duct pressure, and reduce the probability of postoperative pancreatitis and cholangitis. At the same time, the properties and outflow of bile can be observed. For acute suppurative cholangitis, delayed biliary bleeding, etc., sensitive antibiotics or hemostatics can be injected through the nasobiliary drainage tube, with significant clinical effects.

[0004] The nasobiliary drainage tubes currently in use include two types: single pigtail and loop-type. The single pigtail nasobiliary drainage tube has a good anti-displacement effect after the tip is looped, but it is generally used in patients with significantly dilated intrahepatic and extrahepatic bile ducts. If the intrahepatic and extrahepatic bile ducts are not dilated, not only can the tip of the nasobiliary drainage tube not be looped, but the arc-shaped tube formed can easily compress the bile duct wall and cause postoperative pain, bile duct ulcers, bleeding and other complications. The tip of the loop nasobiliary drainage tube is straight and the body has two 60° angles, which has a good anti-displacement effect. However, clinical application has found that the loop nasobiliary drainage tube has the following defects: ① The loop of the nasobiliary drainage tube is generally located at the pylorus, which makes it easy for the nasobiliary drainage tube to compress the duodenal pancreatic duct opening and induce acute pancreatitis; ② The tip of the loop nasobiliary drainage tube is straight, and it is difficult to insert the nasobiliary drainage tube directly with a guide wire into the bile duct, and replacing the papillomatomy cannula prolongs the operation time; ③ The common bile duct and the duodenum are at an acute angle, while the tip of the loop nasobiliary drainage tube is straight. When the drainage tube is pulled out, the straight head is easy to cause the common bile duct to become angled when passing through the duodenal papilla, and the tip of the drainage tube is easy to scratch the bile duct wall and duodenal papilla, leading to complications such as bleeding, acute cholangitis and pancreatitis.

[0005] Endoscopic pancreatic duct drainage is another routine technique for ERCP. Placement of a pancreatic duct drainage tube can be used to treat diseases such as acute pancreatitis and pancreatic abscess, and it also prevents post-ERCP pancreatitis.

[0006] The pancreatic duct drainage tubes used in clinical practice include straight tubes, single pigtail or double pigtail pancreatic duct drainage tubes, which have the following disadvantages: 1. Straight pancreatic duct drainage tubes are prone to internal displacement, and it is difficult to remove the displaced pancreatic duct stent; 2. Single pigtail pancreatic duct drainage tubes are prone to spontaneous dislocation, and early dislocation of the pancreatic duct drainage tube is prone to cause or aggravate pancreatitis; 3. Straight or single pigtail pancreatic duct drainage tubes that have not fallen off require secondary endoscopic removal, which increases the mental and physical pain of the patient.

[0007] In recent years, a variety of drainage tubes that can drain pancreatic juice and bile at the same time have appeared. The pancreatic duct drainage tube can be pulled out at the same time as the nasobiliary drainage tube, thereby avoiding complications such as acute pancreatitis, bleeding, intestinal perforation, and long obstruction caused by the displacement of the pancreatic duct drainage tube, and no secondary endoscopic operation is required to remove the pancreatic duct stent that has not fallen off. Invention patent number: ZL201510236031.1, invention name: loop-type bile and pancreatic juice drainage tube; invention patent number: ZL201510236020.3, invention name: water-bag-type bile and pancreatic juice drainage tube. The pancreatic duct drainage tubes in the above two inventions are both put on the nasobiliary drainage tube through a coil or a metal ring, and the pancreatic duct drainage tube is pulled out of the body at the same time by the loop-shaped nasobiliary drainage tube or the balloon pulling the coil or metal ring at the tail of the pancreatic duct drainage tube. However, after the invention is inserted into the designated tail, under the stimulation of nausea and vomiting of the patient, the connecting line or metal ring at the tail of the pancreatic duct drainage tube is easy to be displaced and dislocated with the nasobiliary drainage tube as the axis; in the process of pulling out of the body, the metal ring at the tail of the loop nasobiliary drainage tube, balloon or pancreatic duct drainage tube passes through the nostrils with great resistance and stimulation. Invention patent number: ZL201510237352.3, invention name: Y-type bile and pancreatic drainage tube with water bag; invention patent number: ZL201510236036.4, invention name: Y-type bile and pancreatic drainage tube. In the above invention, the pancreatic drainage tube is connected to the nasobiliary drainage tube, and the connection position of the pancreatic duct drainage tube and the nasobiliary drainage tube is fixed, which is difficult to apply to all patients. Secondly, in the process of removal, the pancreatic duct drainage tube and the nasobiliary drainage tube run in parallel, and the resistance and stimulation of passing through the nasal cavity are great. Invention patent number: ZL201510242219.7, patent name: integrated bile and pancreatic drainage tube; invention patent number: ZL201510238034.9, invention name: bile and pancreatic drainage tube. In the above invention, the pancreatic duct drainage tube is connected to the side wall of the nasobiliary drainage tube through a connecting line. The nasobiliary drainage tube can be used as a propeller of the pancreatic duct drainage tube to save materials. However, during the removal process, the pancreatic duct drainage tube and the nasobiliary drainage tube run in parallel, increasing the resistance through the nasal cavity, and the head end of the pancreatic duct drainage tube is easy to scratch the upper gastrointestinal mucosa, throat and nasal mucosa, and the side effects and discomfort caused are greater. Utility model patent number: ZL201821584866.1, utility model name: A nasobiliary and pancreatic internal and external drainage tube with a connecting wire. This utility model patent uses the connecting coil at the head end of the nasobiliary drainage tube to cover the tail end of the pancreatic duct drainage tube. The operation is relatively difficult, and the head end of the pancreatic duct drainage tube is easy to scratch the upper gastrointestinal mucosa, throat and nasal mucosa, and the side effects and discomfort caused are greater. Summary of the invention

[0008] In response to the above-mentioned technical problems, a direct-removal bile and pancreatic juice drainage tube is provided.

[0009] The technical means adopted by the present invention are as follows:

[0010] A direct removal type bile and pancreatic drainage tube, comprising: a nasobiliary drainage tube and a pancreatic duct drainage tube, and also comprising a traction tube and a traction line, wherein the traction tube is connected to one end of the traction line, and the traction line passes through the nasobiliary drainage tube and is connected to the tail end of the pancreatic duct drainage tube.

[0011] The nasobiliary drainage tube comprises a nasobiliary drainage tube head, a drainage part, a curved part and a lead-out part which are connected in sequence, and the drainage part comprises a plurality of bile drainage holes.

[0012] The pancreatic duct drainage tube comprises a pancreatic duct drainage tube head, a main drainage part and a tail part which are connected in sequence.

[0013] After the bile and pancreatic fluid drainage tube is inserted into the human body, the head of the nasobiliary drainage tube extends into the right hepatic duct, the bile drainage hole is close to the tube wall on one side of the duodenum, the bile drainage hole includes a middle hole and triangular holes connected to the middle hole and arranged on the left and right sides of the middle hole, the curved portion is provided with multiple groups of bending corners, each bending corner conforms to the corners of the duodenal papilla, pylorus, and greater curvature of the stomach, the lead-out portion extends out of the human body and is connected to the drainage bag; the head of the pancreatic duct drainage tube extends into the pancreatic duct, the main drainage portion is provided with a plurality of pancreatic fluid drainage holes, and the tail is provided with side wings for fixation.

[0014] Furthermore, the triangular hole is an isosceles triangle, the upper and lower parts of the middle hole are symmetrically arranged with the line connecting the vertices of the triangular holes on both sides as the axis, and the distance between the upper middle hole and the lower middle hole is the length of the base of the triangular hole.

[0015] When the bile and pancreatic drainage tube is placed in or removed from the human body, the distance between the upper middle hole and the lower middle hole gradually decreases when the bile drainage hole passes through the wall of one side of the duodenum. After entering the common hepatic duct, the distance between the upper middle hole and the lower middle hole gradually increases until it is restored.

[0016] Furthermore, the head of the nasobiliary drainage tube has an arc and is 1-2 cm long. The angle between the head of the nasobiliary drainage tube and the drainage part is 140-150°, and the drainage part is 11-13 cm long.

[0017] Furthermore, the head of the pancreatic duct drainage tube has a circular arc.

[0018] Furthermore, the curved portion includes a first pipe segment and a second pipe segment, the tail end of the drainage portion is connected to the first pipe segment, the first pipe segment is connected to the second pipe segment, the tail end of the second pipe segment is connected to the head end of the lead-out portion, the angle between the drainage portion and the first pipe segment is 40-60°, the first pipe segment is 5-7 cm long, the angle between the first pipe segment and the second pipe segment is 80-90°, the second pipe segment is 7-9 cm long, and the angle between the second pipe segment and the lead-out portion is 100-130°.

[0019] Furthermore, the lead-out portion is linear and 200-220 cm long.

[0020] Furthermore, the outer diameters of the nasobiliary drainage tube include 5, 7, 8.5, and 10 Fr, the corresponding inner diameters include 4, 5, 6.5, and 8 Fr, and the total length is 2.5-3 m.

[0021] Furthermore, the pancreatic duct drainage tube has an outer diameter of 5 or 7 Fr, an inner diameter of 4 or 5 Fr, and a length of 5 to 11 cm.

[0022] The present invention has the following advantages:

[0023] 1. The nasobiliary drainage tube of the present invention can be used as a propeller to push the pancreatic duct drainage tube into the pancreatic duct.

[0024] 2. The tip of the nasobiliary drainage tube of the present invention is arc-shaped, which makes it easy to enter the bile duct through the duodenal papilla and also easier to enter the right hepatic duct.

[0025] 3. The bile drainage hole in the present invention is in the shape of a left and right triangle with an upper and lower semicircle, and has a better drainage effect; at the same time, the bile drainage hole is located on the tube wall on one side near the duodenum. During the process of pulling out the nasobiliary drainage tube, when the nasobiliary drainage tube section with a side hole passes through the duodenal papilla, the tube walls on both sides of the side hole are close to each other, forming a smaller loop, which is easier to pass through the duodenal papilla, and has less stimulation to the bile duct wall and the duodenal papilla.

[0026] 4. The right hepatic duct, duodenal papilla, pylorus and greater curvature of the nasobiliary drainage tube of the present invention are angled, which conforms to the physical physiological shape and is in an inverted A shape. The drainage tube has less stimulation to tissues and has a stronger anti-displacement ability.

[0027] 5. After the pancreatic duct drainage tube and the nasobiliary drainage tube are placed at the designated positions, the two form an acute angle, and the traction line connected to the tail of the pancreatic duct drainage tube has a traction effect on the pancreatic duct stent, which can prevent the pancreatic duct stent from shifting.

[0028] 6. The traction tube connected to the tail of the traction line in the present invention can prevent the traction line from being pulled out of the nasobiliary drainage tube, and the traction line can also be tightened by pulling the traction tube.

[0029] 7. In the present invention, by tightening the traction line at the tail of the nasobiliary drainage tube during the removal process, the tail of the pancreatic duct drainage tube can be closely connected with the head of the nasobiliary drainage tube, without damaging the upper digestive tract, throat and nasal mucosa. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] 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.

[0031] Figure 1 This is a state diagram of the nasobiliary drainage tube of the present invention being placed in the right hepatic duct and the pancreatic duct drainage tube being placed in the pancreatic duct.

[0032] Figure 2 It is a schematic diagram of the specific structure of the nasobiliary drainage tube of the present invention.

[0033] Figure 3 It is a schematic diagram of the specific structure of the pancreatic duct drainage tube of the present invention.

[0034] Figure 4 This is a state diagram of the process of the bile and pancreatic juice drainage tube of the present invention being separated from the human body.

[0035] Figure 5 The process state of the bile and pancreatic juice drainage tube of the present invention being separated from the human body Figure 2 .

[0036] Figure 6 The process state of the bile and pancreatic juice drainage tube of the present invention being separated from the human body Figure 3 .

[0037] Figure 7 The process state of the bile and pancreatic juice drainage tube of the present invention being separated from the human body Figure 4 .

[0038] Figure 8 This is a schematic diagram of the structure of the bile drainage hole in the first state of the present invention.

[0039] Fig. 9 This is a schematic diagram of the structure of the bile drainage hole in the second state of the present invention.

[0040] In the figure: 1. nasobiliary drainage tube; 11. nasobiliary drainage tube head; 12. drainage part; 13. first tube segment; 14. second tube segment; 15. outlet; 16. bile drainage hole; 2. pancreatic duct drainage tube; 21. pancreatic duct drainage tube head; 22. main drainage part; 23. tail; 24. pancreatic juice drainage hole; 25. flank; 3. traction line; 4. right hepatic duct; 5. pancreatic duct. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution 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 part of the embodiments of the present invention, not all of the embodiments. 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.

[0042] like Figure 1 As shown, this embodiment discloses a direct removal type bile and pancreatic drainage tube, including Figure 2 The nasobiliary drainage tube 1 shown and Figure 3 The pancreatic duct drainage tube 2 shown in the figure also includes a traction tube and a traction wire 3. The traction tube is connected to one end of the traction wire 3. The traction tube is provided with a guide wire hole for a guide wire to pass through. The traction wire 3 passes through the nasobiliary drainage tube 1 and is connected to the tail end of the pancreatic duct drainage tube.

[0043] The nasobiliary drainage tube 1 comprises a nasobiliary drainage tube head 11, a drainage portion 12, a curved portion and a lead-out portion 15 which are connected in sequence. The drainage portion comprises a plurality of bile drainage holes 16.

[0044] The pancreatic duct drainage tube comprises a pancreatic duct drainage tube head 21, a main drainage part 22 and a tail part 23 which are connected in sequence.

[0045] After the bile and pancreatic drainage tube is inserted into the human body, the head of the nasobiliary drainage tube 1 extends into the right hepatic duct 4, and the bile drainage hole 16 is close to the wall of one side of the duodenum. The bile drainage hole 16 includes a middle hole and triangular holes connected to the middle hole and arranged on the left and right sides of the middle hole. In this embodiment, there are 5 to 7 bile drainage holes.

[0046] The curved portion is provided with a plurality of curved corners, each of which conforms to the corners of the duodenal papilla, the pylorus, and the greater curvature of the stomach. The lead-out portion 15 is extended out of the human body and connected to the drainage bag. The head of the pancreatic duct drainage tube extends into the pancreatic duct 5, and the main drainage portion 22 is provided with a plurality of pancreatic fluid drainage holes 24, which are circular holes or oblong holes. The tail is provided with side wings 25 for fixation. Both the nasobiliary drainage tube and the pancreatic duct drainage tube are single-channel tubes. The pancreatic duct drainage tube is L-shaped, and the tail of the pancreatic duct drainage tube is symmetrically tied with wires on the left and right, and the traction line is tied thereto.

[0047] like Figure 8 As shown, the triangular hole is an isosceles triangle, the upper and lower parts of the middle hole are symmetrically arranged with the line connecting the vertices of the triangular holes on both sides as the axis, the distance between the upper middle hole and the lower middle hole is the length of the base of the triangular hole, and the upper middle hole and the lower middle hole are semicircular or major arc. Fig. 9As shown, when the bile drainage hole 16 passes through the wall of one side of the duodenum, the distance between the upper middle hole and the lower middle hole gradually decreases. After entering the common hepatic duct, the distance between the upper middle hole and the lower middle hole gradually increases until it is restored.

[0048] The head of the nasobiliary drainage tube has an arc shape and is 1-2 cm long. The angle between the head of the nasobiliary drainage tube and the drainage part is 140-150°, and the drainage part is 11-13 cm long.

[0049] The head of the pancreatic duct drainage tube has a circular arc.

[0050] The curved portion includes a first pipe segment 13 and a second pipe segment 14, the tail end of the drainage portion is connected to the first pipe segment 13, the first pipe segment 13 is connected to the second pipe segment 14, the tail end of the second pipe segment 14 is connected to the head end of the lead-out portion 15, the angle between the drainage portion and the first pipe segment 13 is 40-60°, the first pipe segment 13 is 5-7cm long, the angle between the first pipe segment 13 and the second pipe segment 14 is 80-90°, the second pipe segment 14 is 7-9cm long, the angle between the second pipe segment 14 and the lead-out portion 15 is 100-130°, and the drainage portion and the first pipe segment are different in color.

[0051] The lead-out portion 15 is linear and 200-220 cm long.

[0052] The outer diameters of the nasobiliary drainage tube 1 include 5, 7, 8.5, and 10 Fr, and the corresponding inner diameters include 4, 5, 6.5, and 8 Fr, with a total length of 2.5-3 m.

[0053] The pancreatic duct drainage tube has an outer diameter of 5 or 7 Fr, an inner diameter of 4 or 5 Fr, and a length of 5 to 11 cm, specifically 5, 7, 9, or 11 cm.

[0054] The specific usage method of this embodiment is as follows:

[0055] Step 0: Insert the duodenoscope orally to complete endoscopic sphincterotomy, dilation, stone removal, etc. Finally, after successful pancreatic duct cannulation using the sphincterotomy tool with a guide wire, leave the guide wire in the pancreatic duct and withdraw the sphincterotomy tool.

[0056] Step 1. Fix the drainage tube head end of the nasobiliary drainage tube 1, pull the pancreatic duct drainage tube outwards, so that the traction line 3 of the nasobiliary drainage tube 1 is exposed 7-10 cm long, and then put the pancreatic duct drainage tube, nasobiliary drainage tube 1, and traction head on the guide wire in sequence.

[0057] Use the nasobiliary drainage tube 1 to push the pancreatic duct drainage tube into the pancreatic duct. When the tail wing 25 of the pancreatic duct drainage tube is close to the papillary sphincter, fix the nasobiliary drainage tube 1 and pull back the guide wire. When the guide wire enters the nasobiliary drainage tube 1, the head end of the nasobiliary drainage tube 1 is separated from the tail of the pancreatic duct drainage tube.

[0058] Step 2, use the method of nasobiliary drainage tube 1 with a guide wire to intubate the bile duct drainage tube. After the intubation is successful, the tip of the nasobiliary drainage tube 1 is inserted into the right hepatic duct 4 under the guidance of the guide wire. At this time, the traction line 3 forms a bend at the tip of the nasobiliary drainage tube 1, fix the nasobiliary drainage tube 1 and withdraw the duodenoscope. After the wall of the nasobiliary drainage tube 1 flows out of the oral cavity, fix the nasobiliary drainage tube 1, pull the nasobiliary drainage tube 1 and the traction tube out of the duodenal forceps, pull the traction tube to tighten the connecting line, so that the traction line 3 in the duodenal cavity is straightened to maintain the traction effect of the traction line 3 on the pancreatic duct drainage tube, thereby reducing the probability of its displacement.

[0059] Step 3: Complete the oral-nose conversion of the nasobiliary drainage tube 1 by the guide wire method. Under the guidance of the guide wire, lead the traction tube and the tail of the nasobiliary drainage tube 1 out of the nasal cavity to fix the nasobiliary drainage tube 1, and connect the nasobiliary drainage tube 1 to the drainage bag through the connector.

[0060] Step 4: When the present invention needs to be dismantled, before taking out the nasobiliary drainage tube 1, remove the drainage bag first, perform angiography on the nasobiliary drainage tube 1, and after confirming that there are no bile duct stones remaining, Figures 4 to 7 As shown, pull the nasobiliary drainage tube 1, drag the tail of the nasobiliary drainage tube 1 from the bile duct to the duodenum, fix the nasobiliary drainage tube 1, pull the traction tube, tighten the traction line 3, make the tail of the pancreatic duct drainage tube close to the head end of the nasobiliary drainage tube 1, and finally pull the nasobiliary drainage tube 1 to pull the nasobiliary drainage tube 1 and the pancreatic duct drainage tube out through the nostrils.

[0061] 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. A direct removal type bile and pancreatic drainage tube, including a nasobiliary drainage tube and a pancreatic duct drainage tube, characterized in that: It also includes a traction tube and a traction line, wherein the traction tube is connected to one end of the traction line, and the traction line passes through the nasobiliary drainage tube and is connected to the tail end of the pancreatic duct drainage tube. The nasobiliary drainage tube comprises a nasobiliary drainage tube head, a drainage part, a curved part and a lead-out part which are connected in sequence, and the drainage part comprises a plurality of bile drainage holes. The pancreatic duct drainage tube comprises a pancreatic duct drainage tube head, a main drainage part and a tail part which are connected in sequence. After the bile and pancreatic fluid drainage tube is inserted into the human body, the head of the nasobiliary drainage tube extends into the right hepatic duct, the bile drainage hole is close to the tube wall on one side of the duodenum, the bile drainage hole includes a middle hole and triangular holes connected to the middle hole and arranged on the left and right sides of the middle hole, the curved portion is provided with multiple groups of bending corners, each bending corner conforms to the corners of the duodenal papilla, pylorus, and greater curvature of the stomach, the lead-out portion extends out of the human body and is connected to the drainage bag; the head of the pancreatic duct drainage tube extends into the pancreatic duct, the main drainage portion is provided with a plurality of pancreatic fluid drainage holes, and the tail is provided with side wings for fixation; the head of the nasobiliary drainage tube has an arc; the head of the pancreatic duct drainage tube has an arc.

2. The direct removal type bile and pancreatic drainage tube according to claim 1, characterized in that: The triangular hole is an isosceles triangle. The upper and lower parts of the middle hole are symmetrically arranged with the line connecting the vertices of the triangular holes on both sides as the axis. The distance between the upper middle hole and the lower middle hole is the length of the base of the triangular hole. When the bile and pancreatic drainage tube is placed in or removed from the human body, the distance between the upper middle hole and the lower middle hole gradually decreases when the bile drainage hole passes through the wall of one side of the duodenum. After entering the common hepatic duct, the distance between the upper middle hole and the lower middle hole gradually increases until it is restored.

3. The direct removal type bile and pancreatic drainage tube according to claim 1, characterized in that: The arc of the head of the nasobiliary drainage tube is 1-2 cm long, the angle between the head of the nasobiliary drainage tube and the drainage part is 140-150°, and the drainage part is 11-13 cm long.

4. The direct removal type bile and pancreatic drainage tube according to claim 1, characterized in that: The curved portion includes a first pipe segment and a second pipe segment, the tail end of the drainage portion is connected to the first pipe segment, the first pipe segment is connected to the second pipe segment, the tail end of the second pipe segment is connected to the head end of the lead-out portion, the angle between the drainage portion and the first pipe segment is 40-60°, the first pipe segment is 5-7cm long, the angle between the first pipe segment and the second pipe segment is 80-90°, the second pipe segment is 7-9cm long, and the angle between the second pipe segment and the lead-out portion is 100-130°.

5. The direct removal type bile and pancreatic drainage tube according to claim 1, characterized in that: The lead-out portion is linear and 200-220 cm long.

6. The direct removal type bile and pancreatic drainage tube according to claim 1, characterized in that: The outer diameters of the nasobiliary drainage tubes include 5, 7, 8.5, and 10 Fr, and the corresponding inner diameters include 4, 5, 6.5, and 8 Fr, with a total length of 2.5-3 m.

7. The direct removal type bile and pancreatic drainage tube according to claim 1, characterized in that: The outer diameter of the pancreatic duct drainage tube includes 5 and 7Fr, the inner diameter includes 4 and 5Fr, and the length is 5 to 11cm.

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