Drainage tube in pancreaticobiliary duct with selectable indwelling period

Abstract

The utility model discloses a pancreaticobiliary internal drainage tube with selectable indwelling periods, and belongs to the technical field of medical drainage tubes. The drainage tube comprises a drainage tube section and a drainage section which are connected into a whole, drainage holes are formed in the drainage tube section and the drainage section, and the drainage tube is characterized in that one end of the drainage tube section is a catheter section, the other end of the drainage tube section is a spiral or pigtail-shaped or D-shaped first fixing ring, and the drainage holes are formed in the first fixing ring; the drainage section is connected with the catheter section of the drainage tube section and is integrally S-shaped, and at least two S-shaped bent parts are arranged; a plurality of first inner supporting strips which are arranged in the length direction of the drainage tube section and protrude towards the inner side of the tube are arranged on the inner wall of the drainage tube section, and a plurality of first outer supporting strips which are arranged in the length direction of the drainage tube section and protrude towards the outer side of the tube are arranged on the outer wall of the drainage tube section. The guide wire can be prevented from entering the common bile duct / main pancreatic duct by mistake, the indwelling time is flexible and controllable, and catheter indwelling and automatic falling are facilitated.

Description

Technical Field

[0001] The utility model relates to a pancreaticobiliary drainage tube, in particular to a pancreaticobiliary drainage tube with a selectable retention period, which is mainly used for temporary pancreaticobiliary drainage under ERCP and belongs to the technical field of medical drainage tubes. Background Art

[0002] The current indwelling bile duct drainage tube / pancreatic duct drainage tube under ERCP is very easy to cause the guide wire to mistakenly enter the main pancreatic duct / common bile duct during catheterization due to the close distance between the main pancreatic duct and the common bile duct. Repeated insertion is likely to cause damage to the main pancreatic duct / common bile duct, and the existing indwelling bile duct drainage tube / pancreatic duct drainage tube lacks flexible controllability in the retention time; in addition, the inner and outer walls of the existing indwelling bile duct drainage tube / pancreatic duct drainage tube are both smooth surfaces, and the contact area between the drainage tube and the guide wire and the inner wall of the pancreatic duct / bile duct is large, which is not convenient for catheterization and may automatically fall off. Utility Model Content

[0003] In view of the above-mentioned defects existing in the prior art, the utility model provides a pancreaticobiliary drainage tube which can prevent the guide wire from mistakenly entering the common bile duct / main pancreatic duct, and has a flexible and controllable retention time and an optional retention period for easy catheterization.

[0004] The utility model is realized through the following technical scheme: a pancreaticobiliary drainage tube with an optional retention period, comprising a drainage tube section and a drainage section connected as one body, both of which are provided with drainage holes, and is characterized in that: one end of the drainage tube section is a catheter section, and the other end of the drainage tube section is a first fixing ring in a spiral shape, a pigtail shape or a D shape, and the first fixing ring is provided with drainage holes; the drainage section and the catheter section of the drainage tube section are connected and are overall S-shaped, and the S-shaped bending parts are at least two; the inner wall of the drainage tube section is provided with a plurality of first inner support strips arranged along the length direction thereof and protruding toward the inner side of the tube, and the outer wall of the drainage tube section is provided with a plurality of first outer support strips arranged along the length direction thereof and protruding toward the outer side of the tube.

[0005] In the utility model, during ERCP surgery, the drainage section and the catheter section of the drainage tube section in the utility model are placed in the common bile duct / main pancreatic duct through a pushing device, and the first fixing ring at one end of the drainage tube section is retained in the duodenum, so that the guide wire can be prevented from mistakenly entering the common bile duct / main pancreatic duct when passing through, and the drainage section and the catheter section of the drainage tube section located in the common bile duct / main pancreatic duct are in an S-shape as a whole, and the S-shaped curved part can form a support with the inner wall of the common bile duct / main pancreatic duct, and the generated support force and the formed friction force can maintain the drainage time in the common bile duct / main pancreatic duct. When the intestinal peristalsis and the chyme in the intestine push the first fixing ring retained in the duodenum, the drainage section in the common bile duct / main pancreatic duct can be driven to move downward, and then gradually fall off. The retention time is related to the size of the first fixing ring, the support force and friction force generated by the S-shaped bend and the inner wall of the common bile duct / main pancreatic duct. The larger the first fixing ring, the shorter the retention time. The greater the support force and friction force generated by the S-shaped bend and the inner wall of the common bile duct / main pancreatic duct, the longer the retention time. The first inner support strip provided on the inner wall of the drainage tube segment and the first outer support strip provided on the outer wall can reduce the contact area between the drainage tube segment and the guide wire and the inner wall of the common bile duct / main pancreatic duct, which is convenient for catheterization and automatic shedding of the drainage tube.

[0006] Furthermore, there are two S-shaped bends, including a first bend and a second bend connected in sequence, the first bend is close to the first fixing ring, and the arc radius and arc length of the first bend are greater than the arc radius and arc length of the second bend.

[0007] Furthermore, there are three S-shaped bends, including a first bend, a second bend, and a third bend connected in sequence, the first bend is close to the first fixed ring, the arc radius and arc length of the first bend are greater than the arc radius and arc length of the second bend, and also greater than the arc radius and arc length of the third bend, and the arc length of the second bend is greater than the arc length of the third bend, and the central angle of the second bend is an obtuse angle.

[0008] Further: there are three S-shaped bends, including a first bend, a second bend, and a third bend connected in sequence, the first bend is close to the first fixed ring, the arc radius and arc length of the first bend are greater than the arc radius and arc length of the second bend, the arc radius and arc length of the second bend are greater than the arc radius and arc length of the third bend, and the central angle of the second bend and the central angle of the third bend are both obtuse angles.

[0009] Furthermore, in order to effectively reduce the contact area, the cross-sectional shapes of the first inner support bar and the first outer support bar are both semicircular arch shapes.

[0010] Furthermore, the inner wall of the drainage section is provided with a plurality of second inner support strips arranged along its length direction and protruding toward the inner side of the tube, and the outer side of the drainage section is provided with a plurality of second outer support strips arranged along its length direction and protruding toward the outer side of the tube, and drainage grooves are formed between adjacent second outer support strips, and a plurality of drainage holes communicating with the interior of the drainage section are provided at intervals at the bottom of the drainage grooves. The second inner support strips provided on the inner wall of the drainage section can reduce the contact area between the guide wire and the drainage tube, and facilitate smooth tube placement. The drainage groove provided on the outer side of the drainage section facilitates drainage, and even if the main channel opening is blocked, the liquid can enter the main channel through the drainage groove to complete the drainage.

[0011] Furthermore, the cross-section of the second outer support bar is T-shaped.

[0012] Furthermore, the end of the drainage section is provided with a second pigtail-shaped fixing ring integral therewith, and the radial dimension of the second fixing ring is smaller than the radial dimension of the first fixing ring at the end of the drainage tube section. The first fixing ring is used to achieve shedding, and the second fixing ring facilitates long-term retention.

[0013] Furthermore, the radial dimension of the first fixing ring is 8-22 mm.

[0014] Furthermore, to prevent liquid backflow, a one-way valve is connected to the end of the first fixing ring.

[0015] The beneficial effects of the utility model are as follows: the utility model can prevent the guide wire from mistakenly entering the common bile duct / main pancreatic duct during ERCP surgery, thereby preventing damage to the common bile duct / main pancreatic duct; the utility model provides a first fixing ring in a spiral shape, a pig tail shape, or a D shape at one end of the drainage tube segment, which can, on the one hand, push the first fixing ring through intestinal peristalsis and the chyme in the intestine, thereby driving the drainage segment in the common bile duct / main pancreatic duct to move downward, thereby causing the drainage tube to fall off; on the other hand, the first fixing ring can be used to control the retention time of the drainage tube The drainage section and the catheter section of the drainage tube section are connected and designed to be S-shaped as a whole. The support force and friction force generated by the S-shaped bending part and the inner wall of the common bile duct / main pancreatic duct can control the retention time of the drainage tube in the common bile duct / main pancreatic duct, so as to achieve short-term retention or medium- to long-term retention. The first inner support bar arranged on the inner wall of the drainage tube section and the first outer support bar arranged on the outer wall can reduce the contact area between the drainage tube section and the guide wire and the inner wall of the common bile duct / main pancreatic duct, so as to facilitate the placement of the tube and the automatic shedding of the drainage tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the pancreatic duct drainage tube in which the first fixing ring is spiral in Example 1;

[0017] Figure 2 is a schematic structural diagram of a bile duct drainage tube in which the first fixing ring is in the shape of a pigtail in Example 1;

[0018] Figure 3 is a cross-sectional schematic diagram of a drainage tube segment provided with inner support bars and outer support bars in Example 1;

[0019] Figure 4 is a cross-sectional schematic diagram of the drainage section in Example 1 when the inner support bar and the outer support bar are provided;

[0020] Figure 5 It is a schematic diagram of the spiral first fixing ring in the utility model;

[0021] Figure 6 It is a schematic diagram of the first fixing ring in the shape of a pigtail in the utility model;

[0022] Figure 7 It is a schematic diagram of a D-shaped first fixing ring in the utility model;

[0023] Figure 8 is a schematic structural diagram of a drainage tube in which the first fixing ring is a spiral in Embodiment 2;

[0024] Fig. 9 is a schematic structural diagram of a drainage tube in which the first fixing ring is in the shape of a pigtail in Example 2;

[0025] Fig.10 is a schematic structural diagram of a drainage tube in which the first fixing ring is D-shaped in Example 2;

[0026] Fig.11 is a schematic structural diagram of the drainage tube in Example 3;

[0027] Fig.12 is a schematic structural diagram of the drainage tube in Example 4;

[0028] Fig.13 is a schematic structural diagram of the drainage tube in Example 5;

[0029] Fig.14 is a schematic diagram of a drainage tube in Example 6, in which a second fixing ring is provided at the upper part and a first spiral fixing ring is provided at the lower part;

[0030] Fig.15 It is a schematic diagram of a drainage tube in Example 6, in which a second fixing ring is provided on the upper part and a first fixing ring in the shape of a pigtail is provided on the lower part;

[0031] Fig.16 is a schematic diagram of a drainage tube in Example 6, in which a second fixing ring is provided on the upper part and a first fixing ring in a D shape is provided on the lower part;

[0032] Fig.17 It is a schematic diagram of the utility model being placed in the main pancreatic duct;

[0033] Fig.18It is a schematic diagram of the utility model being simultaneously indwelled in the main pancreatic duct and the common bile duct;

[0034] Fig.19 This is a schematic diagram of the guide wire and pusher used when the drainage tube is placed;

[0035] In the figure, 1, drainage tube segment, 2, drainage segment, 3, drainage hole, 4, common bile duct, 5, main pancreatic duct, 6, duodenum, 7, endoscope, 8, guide wire, 9, developing head, 10, pusher, 11, one-way valve;

[0036] 101, first bending portion, 102, second bending portion, 103, third bending portion;

[0037] 1-1, catheter section, 1-2, first fixing ring, 1-3, first inner support bar, 1-4, first outer support bar;

[0038] 2-1, second inner support bar, 2-2, second outer support bar, 2-3, drainage groove, 2-4, second fixing ring. DETAILED DESCRIPTION

[0039] The present invention is further described below by way of non-limiting embodiments and in conjunction with the accompanying drawings:

[0040] Example 1

[0041] As attached Figure 1-Figure 7 , Attachment Figure 17-Figure 19 As shown, a pancreatic and bile duct drainage tube with an optional retention period, the tube body can be made of silicone rubber or PU or PVC or PE, the inner wall is attached with a hydrophilic super-slip coating, and the tube body has a development function under X-ray. The pancreatic and bile duct drainage tube with an optional retention period includes a drainage tube segment 1 and a drainage tube segment 2 connected as one body, and a plurality of drainage holes 3 are provided on the drainage tube segment 1 and the drainage tube segment 2, wherein one end of the drainage tube segment 1 is a catheter segment 1-1, and the other end of the drainage tube segment 1 is a first fixing ring 1-2, and the first fixing ring 1-2 is provided with drainage holes 3. The shape of the first fixing ring 1-2 is spiral, as shown in the attached Figure 5 or the shape of the first fixing ring 1-2 is a pig tail shape, as shown in the attached Figure 6 or the shape of the first fixing ring 1-2 is D-shaped, as shown in the attached Figure 7As shown. The size of the first fixing ring 1-2 is 8-22mm. The drainage section 2 and the catheter section 1-1 of the drainage tube section 1 are connected and are S-shaped as a whole, and there are at least two S-shaped bending parts. The inner wall of the drainage tube section 1 is provided with a plurality of first inner support bars 1-3 arranged along its length direction and protruding to the inner side of the tube, and the outer wall of the drainage tube section 1 is provided with a plurality of first outer support bars 1-4 arranged along its length direction and protruding to the outer side of the tube, and the first inner support bars 1-3 and the first outer support bars 1-4 are both integrally formed with the drainage tube section 1. The provision of the first inner support bar 1-3 and the first outer support bar 1-4 can reduce the contact area between the drainage tube section 1 and the guide wire, the inner wall of the common bile duct / the inner wall of the main pancreatic duct, and facilitate the placement of the drainage tube and the automatic shedding of the drainage tube. In order to effectively reduce the contact area, it is preferred that the cross-sectional shapes of the first inner support bar 1-3 and the first outer support bar 1-4 are both semicircular arches.

[0042] In order to prevent infection caused by liquid backflow, a one-way valve 11 may be connected to the end of the first fixing ring 1-2 in the utility model.

[0043] In order to facilitate smooth catheterization and prevent the blockage of the drainage tube from affecting the operation, the utility model can also be provided with a plurality of second inner support strips 2-1 arranged along the length direction and protruding to the inner side of the tube on the inner wall of the drainage section 2, and a plurality of second outer support strips 2-2 arranged along the length direction and protruding to the outer side of the tube are provided on the outer side of the drainage section 2, and a drainage groove 2-3 is formed between adjacent second outer support strips 2-2, and a plurality of drainage holes communicating with the inside of the drainage section 2 are arranged at intervals at the bottom of the drainage groove 2-3. The second inner support strip 2-1 provided on the inner wall of the drainage section 2 can reduce the contact area between the guide wire and the drainage tube, and facilitate smooth catheterization. The function of the drainage groove 2-3 provided on the outer side of the drainage section 2 is to facilitate drainage. Even if the main channel opening is blocked, the liquid can enter the main channel through the drainage groove 2-3 to complete the drainage. Preferably, the cross-sectional shape of the second outer support strip 2-2 is T-shaped. To ensure the drainage effect, the number of the drainage grooves 2-3 can be three or more.

[0044] When the utility model is used for ERCP surgery, the drainage section 2 and the catheter section 1-1 of the drainage tube section 1 in the utility model are placed in the common bile duct 4 / main pancreatic duct 5 through the pusher 10, and the first fixing ring 1-2 at one end of the drainage tube section is retained in the duodenum 6, so that the guide wire 8 can be prevented from mistakenly entering the common bile duct / main pancreatic duct when passing through. Since the drainage section 2 and the catheter section 1-1 of the drainage tube section located in the common bile duct / main pancreatic duct are S-shaped as a whole, the S-shaped curved part can form a support with the inner wall of the common bile duct / main pancreatic duct, and the generated support force and the formed friction force can maintain its drainage time in the common bile duct / main pancreatic duct. When the intestinal peristalsis and the chyme in the intestine push the first fixing ring 1-2 retained in the duodenum, the drainage section 2 in the common bile duct / main pancreatic duct can be driven to move downward, and then gradually fall off. The retention time of the drainage tube is related to the size of the first fixing ring 1-2, the support force and friction force generated by the S-shaped curved part and the inner wall of the common bile duct / main pancreatic duct. The larger the size of the first fixing ring 1-2, the shorter the retention time. The greater the support force and friction force generated by the S-shaped curved part and the inner wall of the common bile duct / main pancreatic duct, the longer the retention time. Therefore, according to the required retention time, the size of the first fixing ring 1-2, the number of curved parts of the S-shaped curved part, the degree of curvature of the curved part, etc. can be set to obtain different retention times.

[0045] Usually, the first fixing ring 1-2 is a pigtail-shaped or spiral-shaped drainage tube suitable for main pancreatic duct indwelling, and the first fixing ring 1-2 is a pigtail-shaped or D-shaped drainage tube suitable for common bile duct indwelling.

[0046] The utility model can be placed in the common bile duct alone or in the main pancreatic duct alone, or in both the common bile duct and the main pancreatic duct. Fig.17 The diagram shows the schematic diagram of the placement in the main pancreatic duct. Fig.18 Shown is a schematic diagram of simultaneous placement in the common bile duct and main pancreatic duct.

[0047] The other parts of this embodiment are all prior art and will not be described in detail here.

[0048] Example 2

[0049] As attached Figure 8-Figure 10 As shown, this embodiment is basically the same as embodiment 1, except that: in this embodiment, there are two S-shaped bends formed by connecting the drainage segment 2 and the catheter segment 1-1 of the drainage tube segment 1, and the shapes and sizes of the two S-shaped bends are the same.

[0050] The other parts of this embodiment are the same as those of Embodiment 1 and will not be described again.

[0051] Example 3

[0052] As attached Fig.11As shown, this embodiment is basically the same as embodiment 1, except that: in this embodiment, there are two S-shaped bends connecting the drainage segment 2 and the catheter segment 1-1 of the drainage tube segment 1, including a first bend 101 and a second bend 102 connected in sequence, the first bend 101 is close to the first fixing ring 1-2, and the arc radius and arc length of the first bend 101 are greater than the arc radius and arc length of the second bend 102. The first bend 101 and the second bend 102 can respectively form two supporting points with the inner wall of the common bile duct / main pancreatic duct. Since the arc radius and arc length of the first bend 101 are greater than the arc radius and arc length of the second bend 102, the supporting force and friction force generated by the first bend 101 and the inner wall of the common bile duct / main pancreatic duct are greater than the supporting force and friction force generated by the second bend 102 and the inner wall of the common bile duct / main pancreatic duct, and the time for the drainage tube to fall off is prolonged. At the same time, because the larger first bend 101 is close to the first fixing ring 1-2, when the first bend 101 falls off, the smaller second bend 102 will fall off faster due to insufficient supporting force.

[0053] The other parts of this embodiment are the same as those of Embodiment 1 and will not be described again.

[0054] Example 4

[0055] As attached Fig.12 As shown, this embodiment is basically the same as embodiment 1, except that: in this embodiment, there are three S-shaped bends formed by connecting the drainage section 2 and the catheter section 1-1 of the drainage tube section 1, including a first bend 101, a second bend 102, and a third bend 103 connected in sequence, the first bend 101 is close to the first fixing ring 1-2, the arc radius and arc length of the first bend 101 are both greater than the arc radius and arc length of the second bend 102, and also greater than the arc radius and arc length of the third bend 103, and the arc length of the second bend 102 is greater than the arc length of the third bend 103, and the central angle of the second bend 102 is an obtuse angle. The three bends can form three support points with the inner wall of the common bile duct / main pancreatic duct respectively, among which the protrusion range of the second bend 102 is larger than that of the third bend, and the central angle is an obtuse angle, so that a greater supporting force can be obtained in the common bile duct / main pancreatic duct, and because the second bend 102 is farther away from the first fixing ring 1-2, a longer disengagement time can be obtained.

[0056] The other parts of this embodiment are the same as those of Embodiment 1 and will not be described again.

[0057] Example 5

[0058] As attached Fig.13As shown, this embodiment is basically the same as embodiment 1, except that: in this embodiment, there are three S-shaped bends connecting the drainage section 2 and the catheter section 1-1 of the drainage tube section 1, including a first bend 101, a second bend 102, and a third bend 103 connected in sequence, the first bend 101 is close to the first fixing ring 1-2, the arc radius and arc length of the first bend 101 are greater than the arc radius and arc length of the second bend 102, the arc radius and arc length of the second bend 102 are greater than the arc radius and arc length of the third bend 103, and the center angle of the second bend 102 and the center angle of the third bend 103 are both obtuse angles. The three bends can respectively form three support points with the inner wall of the common bile duct / main pancreatic duct, among which the protruding range of the second bend 102 is larger than that of the third bend, and a greater supporting force can be obtained in the common bile duct / main pancreatic duct. Moreover, since the second bend 102 is farther away from the first fixing ring 1-2, a longer falling-off time can be obtained. The third bend 103 also plays a certain supporting effect, adding a support point, thereby obtaining a longer retention time.

[0059] The other parts of this embodiment are the same as those of Embodiment 1 and will not be described again.

[0060] Example 6

[0061] As attached Figure 14-16 As shown, this embodiment is basically the same as the embodiment 1, except that: in this embodiment, a second fixing ring 2-4 in the shape of a pigtail is provided at the end of the drainage section 2, and the radial dimension of the second fixing ring 2-4 is smaller than the radial dimension of the first fixing ring 1-2 at the end of the drainage tube section. Fig.14 The figure shows a schematic diagram of a drainage tube with a second fixing ring 2-4 at the upper part and a spiral first fixing ring 1-2 at the lower part; Fig.15 It is a schematic diagram of a drainage tube with a second fixing ring 2-4 on the upper part and a first fixing ring 1-2 in the shape of a pigtail on the lower part; Fig.16 It is a schematic diagram of a drainage tube with a second fixing ring 2-4 at the upper part and a D-shaped first fixing ring 1-2 at the lower part.

[0062] In the drainage tube of this embodiment, the first fixing ring 1-2 is used to achieve the shedding of the drainage tube, and the second fixing ring 2-4 is used to achieve long-term retention.

Claims

1. A pancreaticobiliary drainage tube with a selectable indwelling period, comprising a drainage tube section (1) and a drainage section (2) connected as one body, wherein both the drainage tube section (1) and the drainage section (2) are provided with drainage holes, wherein: One end of the drainage tube segment (1) is a catheter segment, and the other end of the drainage tube segment (1) is a first fixing ring (1-2) in a spiral shape, a pigtail shape, or a D-shape, and a drainage hole is provided on the first fixing ring (1-2); the drainage segment (2) and the catheter segment of the drainage tube segment (1) are connected and are overall S-shaped, and the S-shaped bending parts are at least two; the inner wall of the drainage tube segment (1) is provided with a plurality of first inner support bars (1-3) arranged along the length direction thereof and protruding toward the inner side of the tube, and the outer wall of the drainage tube segment (1) is provided with a plurality of first outer support bars (1-4) arranged along the length direction thereof and protruding toward the outer side of the tube.

2. The pancreaticobiliary drainage tube with selectable indwelling period according to claim 1, characterized in that: There are two S-shaped curved parts, including a first curved part and a second curved part connected in sequence, wherein the first curved part is close to the first fixing ring, and the arc radius and arc length of the first curved part are greater than the arc radius and arc length of the second curved part.

3. The pancreaticobiliary drainage tube with selectable indwelling period according to claim 1, characterized in that: There are three S-shaped bends, including a first bend, a second bend, and a third bend connected in sequence. The first bend is close to the first fixing ring. The arc radius and arc length of the first bend are greater than the arc radius and arc length of the second bend, and also greater than the arc radius and arc length of the third bend. The arc length of the second bend is greater than the arc length of the third bend, and the central angle of the second bend is an obtuse angle.

4. The pancreaticobiliary drainage tube with selectable indwelling period according to claim 1, characterized in that: There are three S-shaped bends, including a first bend, a second bend, and a third bend connected in sequence, the first bend is close to the first fixed ring, the arc radius and arc length of the first bend are greater than the arc radius and arc length of the second bend, the arc radius and arc length of the second bend are greater than the arc radius and arc length of the third bend, and the central angle of the second bend and the central angle of the third bend are both obtuse angles.

5. The pancreaticobiliary drainage tube with selectable indwelling period according to claim 1, 2, 3 or 4, characterized in that: The cross-sectional shapes of the first inner support bar (1-3) and the first outer support bar (1-4) are both semicircular arch shapes.

6. The pancreaticobiliary drainage tube with selectable indwelling period according to claim 1, 2, 3 or 4, characterized in that: The inner wall of the drainage section (2) is provided with a plurality of second inner support bars (2-1) arranged along its length direction and protruding toward the inner side of the tube, and the outer side of the drainage section (2) is provided with a plurality of second outer support bars (2-2) arranged along its length direction and protruding toward the outer side of the tube, and drainage grooves (2-3) are formed between adjacent second outer support bars (2-2), and a plurality of drainage holes communicating with the interior of the drainage section (2) are arranged at intervals at the bottom of the drainage grooves (2-3).

7. The pancreaticobiliary drainage tube with selectable indwelling period according to claim 6, characterized in that: The cross-section of the second outer support bar (2-2) is T-shaped.

8. The pancreaticobiliary drainage tube with selectable indwelling period according to claim 6, characterized in that: The end of the drainage section (2) is provided with a second fixing ring (2-4) in the shape of a pigtail which is integrated therewith, and the radial dimension of the second fixing ring (2-4) is smaller than the radial dimension of the first fixing ring (1-2) at the end of the drainage tube section.

9. The pancreaticobiliary drainage tube with selectable indwelling period according to claim 6, characterized in that: The radial dimension of the first fixing ring (1-2) is 8-22 mm.

10. The pancreaticobiliary drainage tube with selectable indwelling period according to claim 6, characterized in that: The end of the first fixing ring (1-2) is connected to a one-way valve (11).

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