Multi-stage duodenal papilla dilatation balloon catheter

Abstract

The present invention provides a multi-stage duodenal papilla expansion balloon catheter, comprising a balloon group, a catheter, an injection-molded connector and a connecting pipe joint; the balloon group comprises a first balloon, a second balloon and a third balloon; the catheter comprises a first drainage tube segment, a second drainage tube segment, a third drainage tube segment, a fourth drainage tube segment and a fifth drainage tube segment; a first channel is arranged in the first drainage tube segment; a second channel and a third channel are arranged in the second drainage tube segment; a fourth channel, a fifth channel and a sixth channel are arranged in the third drainage tube segment; a seventh channel, an eighth channel, a ninth channel and a tenth channel are arranged in the fourth drainage tube segment; the fifth drainage tube segment is an extension tube of the fourth drainage tube segment; the connecting pipe joint comprises a first connecting joint, a second connector, a third connector and a fourth connector; each channel in the fifth drainage tube segment is connected to a corresponding connector. The present invention can increase the effective expansion range of the nipple sphincter, avoid the occurrence of nipple tearing and bleeding, has low pressure requirements and is simple to operate.

Description

Technical Field

[0001] The present invention relates to the field of minimally invasive medical technology and surgical instrument technology, and in particular to a multi-stage duodenal papilla dilation balloon catheter, which is a duodenoscope minimally invasive surgical instrument used for dilating the duodenal papilla sphincter or biliary system stenosis diseases. Background Art

[0002] Common bile duct stones are a common and frequently occurring disease in my country. Stones blocking the common bile duct can induce complications such as acute cholangitis, obstructive jaundice, and acute biliary pancreatitis, with symptoms such as chills, fever, abdominal pain, and jaundice. In severe cases, it can even lead to shock. Long-term stone stimulation carries the risk of developing bile duct cancer, making it an important disease that endangers human health. Endoscopic retrograde cholangiopancreatography (ERCP) technology is widely used as a first-line method for the treatment of common bile duct stones due to its advantages of less trauma, faster recovery, and fewer contraindications.

[0003] Endoscopic retrograde balloon dilatation of the duodenal papilla is one of the conventional technical means of therapeutic ERCP. By mechanically dilating the duodenal sphincter, the papilla opening is temporarily enlarged to facilitate the placement of stone removal baskets, biliary stents and other instruments, while also facilitating the discharge of common bile duct stones, lithotripsy, bile sludge, bile, etc.

[0004] At present, the duodenal nipple balloon catheters used in clinical practice all adopt a single balloon design, which can be divided into two types according to the different expansion diameters. One type of balloon adopts a fixed diameter, and one type of balloon catheter can only expand the nipple to a fixed diameter. The other type of balloon adopts a variable diameter balloon, and the balloon expansion diameter can be increased by 2mm by increasing the balloon pressure. This type of balloon has high requirements on the material of the balloon membrane and has a high production cost. In addition, when a larger balloon is expanded, during the injection of contrast agent, the two ends of the balloon are filled first, and the middle of the balloon is squeezed into a concave shape by the nipple sphincter. As the balloon pressure increases, the concave balloon fills up quickly, which will cause the nipple sphincter to tear, and the tearing speed is fast, which is prone to nipple bleeding. Summary of the invention

[0005] According to the above proposal, the duodenal papilla balloon catheters currently in clinical use all adopt a single balloon design, which can be divided into two types according to the different expansion diameters. One type of balloon adopts a fixed diameter, and one type of balloon catheter can only expand the nipple to a fixed diameter. The other type of balloon adopts a variable diameter balloon, and the balloon expansion diameter can be increased by 2mm by increasing the balloon pressure. This type of balloon has high requirements on the material of the balloon membrane and has a high production cost. In addition, when a larger balloon is expanded, during the injection of contrast agent, the two ends of the balloon are filled first, and the middle of the balloon is squeezed into a concave shape due to the squeezing of the nipple sphincter. As the balloon pressure increases, the concave balloon fills up quickly, which can cause the nipple sphincter to tear, and the tearing speed is fast, which is prone to nipple bleeding. Technical problems, and a multi-stage duodenal papilla dilation balloon catheter is provided. The present invention mainly utilizes a multi-balloon design to increase the effective expansion range of the papillary sphincter; the balloons are fixed in an overlapping manner, and each balloon is gradually filled from the inside to the outside, which can achieve step-by-step expansion of the duodenal papillary sphincter and reduce the risk of rapid tearing and bleeding of the papillary sphincter; one side of the fifth drainage tube segment is designed with an arc-shaped bend, which conforms to the physiological angle of the duodenum and the common bile duct, facilitates uniform stress on the duodenal papillary sphincter, and can avoid excessive compression of the 12 o'clock position of the nipple by the balloon, thereby promoting the occurrence of nipple tearing and bleeding.

[0006] The technical means adopted by the present invention are as follows:

[0007] A multi-stage duodenal papilla dilatation balloon catheter comprises a balloon group, a catheter, an injection-molded connector connected to the catheter, and a connecting pipe joint, wherein the catheter is connected to the connecting pipe joint through the injection-molded connector;

[0008] The balloon group comprises a first balloon, a second balloon and a third balloon stacked in sequence, both ends of the first balloon, the second balloon and the third balloon are tapered, and the middle body is cylindrical; the length of the first balloon is smaller than the length of the second balloon, and the length of the second balloon is smaller than the length of the third balloon; the head ends of the first balloon, the second balloon and the third balloon are flush and are all fixed to the catheter by a first metal ring; the tail ends of the first balloon, the second balloon and the third balloon are fixed to the catheter by a second metal ring, a third metal ring and a fourth metal ring respectively;

[0009] The catheter comprises a first drainage tube segment, a second drainage tube segment, a third drainage tube segment, a fourth drainage tube segment and a fifth drainage tube segment which are connected in sequence;

[0010] The first drainage tube section is a single-channel tube, and is provided with a first channel therein for inserting a guide wire;

[0011] The second drainage tube segment is a double-channel tube, attached to the first balloon, and provided with a second channel and a third channel connected to the first channel. The head end of the second channel is a blind end, and is connected to the first balloon through a first side hole opened on the wall of the second drainage tube segment; the attached first balloon refers to the first balloon sleeved on the outer wall of the second drainage tube segment;

[0012] The third drainage tube segment is a three-channel tube, which is provided with a fourth channel, a fifth channel connected to the second channel, and a sixth channel connected to the third channel; the third drainage tube segment and the second drainage tube segment are jointly attached with the second balloon, the head end of the fourth channel is a blind end, and is connected with the second balloon through a second side hole opened on the tube wall of the third drainage tube segment; the third drainage tube segment and the second drainage tube segment are jointly attached with the second balloon means that the outer walls of the third drainage tube segment and the second drainage tube segment are jointly sleeved with the second balloon;

[0013] The fourth drainage tube segment is a four-channel tube, which is provided with a seventh channel, an eighth channel connected to the fourth channel, a ninth channel connected to the fifth channel, and a tenth channel connected to the sixth channel; the fourth drainage tube segment, the second drainage tube segment, and the third drainage tube segment are jointly attached with the third balloon, the head end of the seventh channel is a blind end, and is connected with the third balloon through a third side hole opened on the tube wall of the fourth drainage tube segment; the fourth drainage tube segment, the second drainage tube segment, and the third drainage tube segment are jointly attached with the third balloon, which means that the fourth drainage tube segment, the second drainage tube segment, and the third drainage tube segment are jointly sleeved on the outer walls;

[0014] The fifth drainage pipe section is an extension of the fourth drainage pipe section, and is a four-channel pipe, in which the seventh channel, the eighth channel, the ninth channel and the tenth channel are arranged; one side of the fifth drainage pipe section connected to the fourth drainage pipe section is curved, and the bending angle θ is 45°; the other side of the fifth drainage pipe section is connected to the injection molding connector; the angle between the fourth drainage pipe section and the bent straight pipe on the fifth drainage pipe section is 45°;

[0015] The connecting pipe joint includes a first connecting joint, a second connecting head, a third connecting head and a fourth connecting head, all of which are single-channel joints; the seventh channel, the eighth channel, the ninth channel and the tenth channel are respectively connected to the third connecting head, the second connecting head, the first connecting joint and the fourth connecting head.

[0016] Furthermore, the outer diameter of the catheter is 7 to 8.5 Fr; and the total length of the catheter is 180 cm.

[0017] Furthermore, the diameter of the first channel is 1 mm.

[0018] Furthermore, the diameters of the second channel, the fourth channel and the seventh channel respectively connected to the balloons are equal, which are all 0.3 mm.

[0019] Further, the length of the first balloon is 3 cm, the length of the second balloon is 3.5 cm, and the length of the third balloon is 4 cm;

[0020] The expanded diameters of the first balloon, the second balloon and the third balloon are 6 mm, 8 mm and 10 mm, or 10 mm, 12 mm and 14 mm, or 14 mm, 16 mm and 18 mm, or 18 mm, 20 mm and 22 mm, respectively.

[0021] The blind end mentioned above refers to the L-shaped head end of the water injection and gas injection channel, which is connected to the balloon cavity through a side hole opened on the catheter wall.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] 1. The multi-stage duodenal papilla dilatation balloon catheter provided by the present invention adopts a multi-balloon design to increase the effective dilatation range of the papilla sphincter.

[0024] 2. The multi-stage duodenal papilla dilatation balloon catheter provided by the present invention has balloons fixed in an intussusceptible manner, and each balloon is gradually filled from the inside to the outside, which can achieve step-by-step expansion of the duodenal papilla sphincter and reduce the risk of rapid tearing and bleeding of the papilla sphincter.

[0025] 3. The multi-stage duodenal papilla dilatation balloon catheter provided by the present invention has an arc-shaped bend on one side of the fifth drainage tube segment, and the balloon segment drainage tube segment and the bent straight tube on the extended segment fifth drainage tube segment form an angle of 45°, which conforms to the physiological angle of the duodenum and the common bile duct, facilitates uniform stress on the duodenal papilla sphincter, and avoids excessive compression of the balloon on the 12 o'clock area of ​​the papilla, which promotes the occurrence of papilla tearing and bleeding.

[0026] 4. The multi-stage duodenal papilla dilatation balloon catheter provided by the present invention has each balloon with a fixed diameter, and can reach the dilated diameter under relatively low pressure, has low pressure requirements, is simple to operate, and has low manufacturing costs.

[0027] In summary, the application of the technical solution of the present invention can solve the problem that the duodenal nipple balloon catheters used in clinical applications in the prior art all adopt a single balloon design, which can be divided into two types according to the different expansion diameters, one of which adopts a fixed diameter balloon, and one type of balloon catheter can only expand the nipple to a fixed diameter, and the other balloon adopts a variable diameter balloon, and the balloon expansion diameter can be increased by 2mm by increasing the balloon pressure. This type of balloon has high requirements on the material of the balloon membrane and has a high production cost; in addition, when a larger balloon is expanded, during the injection of contrast agent, the two ends of the balloon are filled first, and the middle of the balloon is squeezed into a concave shape by the nipple sphincter. As the balloon pressure increases, the concave balloon fills up quickly, which will cause the nipple sphincter to tear, and the tearing speed is fast, and the nipple bleeding problem is prone to occur.

[0028] Based on the above reasons, the present invention can be widely promoted in the fields of minimally invasive medical technology and surgical instruments. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] 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.

[0030] Figure 1 It is a schematic diagram of the structure of a multi-stage duodenal papilla dilatation balloon catheter in a specific embodiment of the present invention.

[0031] Figure 2 for Figure 1 Middle AA section view.

[0032] Figure 3 for Figure 1 Middle BB cross-section.

[0033] Figure 4 for Figure 1 Middle CC section.

[0034] Figure 5 It is a schematic diagram of a multi-stage duodenal papilla dilatation balloon catheter in a working state (first balloon is filled) in a specific embodiment of the present invention.

[0035] Figure 6 It is a schematic diagram of a multi-stage duodenal papilla dilatation balloon catheter in a working state (the first balloon and the second balloon are inflated) in a specific embodiment of the present invention.

[0036] Figure 7It is a schematic diagram of a multi-stage duodenal papilla dilatation balloon catheter in a working state in a specific embodiment of the present invention (the first balloon, the second balloon and the third balloon are filled).

[0037] In the figure: 1, first drainage tube segment; 2, second drainage tube segment; 3, third drainage tube segment; 4, fourth drainage tube segment; 5, fifth drainage tube segment; 6, injection molding connector; 7, connecting pipe joint; 8, first balloon; 9, syringe or pressure pump; 10, second balloon; 11, third balloon;

[0038] 21. Second channel; 22. Third channel;

[0039] 31, fourth channel; 32, fifth channel; 33, sixth channel;

[0040] 41, seventh channel; 42, eighth channel; 43, ninth channel; 44, tenth channel;

[0041] 71. First connecting joint; 72. Second connecting joint; 73. Third connecting joint; 74. Fourth connecting joint. DETAILED DESCRIPTION

[0042] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0043] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions 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 only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. 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.

[0044] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0045] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, the numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0046] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0047] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0048] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0049] like Figure 1-7As shown, the present invention provides a multi-stage duodenal papilla dilatation balloon catheter, comprising a balloon group, a catheter, an injection molded connector 6 connected to the catheter, and a connecting pipe joint 7, wherein the catheter is connected to the connecting pipe joint 7 via the injection molded connector 6;

[0050] The balloon group comprises a first balloon 8, a second balloon 10 and a third balloon 11 which are stacked in sequence, the two ends of the first balloon 8, the second balloon 10 and the third balloon 11 are all tapered, and the middle body is cylindrical; the length of the first balloon 8 is shorter than the length of the second balloon 10, and the length of the second balloon 10 is shorter than the length of the third balloon 11; the head ends of the first balloon 8, the second balloon 10 and the third balloon 11 are flush and are all fixed to the catheter by a first metal ring; the tail ends of the first balloon 8, the second balloon 10 and the third balloon 11 are fixed to the catheter by a second metal ring, a third metal ring and a fourth metal ring respectively;

[0051] The catheter comprises a first drainage tube segment 1, a second drainage tube segment 2, a third drainage tube segment 3, a fourth drainage tube segment 4 and a fifth drainage tube segment 5 which are connected in sequence;

[0052] The first drainage tube section 1 is a single-channel tube, and is provided with a first channel therein for inserting a guide wire;

[0053] The second drainage tube section 2 is a double-channel tube, attached with the first balloon 8, and provided with a second channel 21 and a third channel 22 connected with the first channel. The head end of the second channel 21 is a blind end, and is connected with the first balloon 8 through a first side hole opened on the wall of the second drainage tube section 2; the attached first balloon 8 refers to the first balloon 8 sleeved on the outer wall of the second drainage tube section 2;

[0054] The third drainage tube segment 3 is a three-channel tube, which is provided with a fourth channel 31, a fifth channel 32 connected to the second channel 21, and a sixth channel 33 connected to the third channel 22; the third drainage tube segment 3 and the second drainage tube segment 2 are attached with the second balloon 10, the head end of the fourth channel 31 is a blind end, and is connected to the second balloon 10 through a second side hole opened on the tube wall of the third drainage tube segment 3;

[0055] The fourth drainage tube segment 4 is a four-channel tube, which is provided with a seventh channel 41, an eighth channel 42 connected to the fourth channel 31, a ninth channel 43 connected to the fifth channel 32, and a tenth channel 44 connected to the sixth channel 33; the fourth drainage tube segment 4, the second drainage tube segment 2, and the third drainage tube segment 3 are jointly attached with the third balloon 11, the head end of the seventh channel 41 is a blind end, and is connected to the third balloon 11 through a third side hole opened on the tube wall of the fourth drainage tube segment 4;

[0056] The fifth drainage pipe section 5 is an extension of the fourth drainage pipe section 4, and is a four-channel pipe, in which the seventh channel 41, the eighth channel 42, the ninth channel 43 and the tenth channel 44 are arranged; the side of the fifth drainage pipe section 5 connected to the fourth drainage pipe section 4 is curved, and the bending angle θ is 45°; the other side of the fifth drainage pipe section 5 is connected to the injection molding connector 6; the angle between the fourth drainage pipe section 4 and the bent straight pipe on the fifth drainage pipe section 5 is 45°;

[0057] The connecting pipe joint 7 includes a first connecting joint 71, a second connecting head 72, a third connecting head 73 and a fourth connecting head 74, all of which are single-channel joints; the seventh channel 41, the eighth channel 42, the ninth channel 43 and the tenth channel 44 are respectively connected to the third connecting head 73, the second connecting head 72, the first connecting joint 71 and the fourth connecting head 74. Among them, the injection connector 6 has four channels; the seventh channel 41, the eighth channel 42, the ninth channel 43 and the tenth channel 44 respectively pass through the right ends of the four channels of the injection connector 6, and are directly connected to the third connector 73, the second connector 72, the first connector 71 and the fourth connector 74; or, the seventh channel 41, the eighth channel 42, the ninth channel 43 and the tenth channel 44 are respectively connected to the four channels of the injection connector 6, and the right ends of the four channels of the injection connector 6 are respectively connected to the third connector 73, the second connector 72, the first connector 71 and the fourth connector 74, at this time, the seventh channel 41, the eighth channel 42, the ninth channel 43 and the tenth channel 44 are indirectly connected to the third connector 73, the second connector 72, the first connector 71 and the fourth connector 74 through the four channels of the injection connector 6. The injection connector 6 is a polyethylene molded structure, and there are four channels in the fifth drainage tube section 5 of the catheter, which can be divided into a single separate catheter through the injection connector 6.

[0058] The outer diameter of the catheter is 7 to 8.5 Fr; the total length of the catheter is 180 cm, that is, the length of the entire catheter from the first drainage tube segment 1 to the fifth drainage tube segment 5 is 180 cm.

[0059] The diameter of the first channel is 1 mm.

[0060] The diameters of the second channel 21 , the fourth channel 31 and the seventh channel 41 respectively connected to the balloons are equal, which are all 0.3 mm.

[0061] The length of the first balloon 8 is 3 cm, the length of the second balloon 10 is 3.5 cm, and the length of the third balloon 11 is 4 cm; the expansion diameters of the first balloon 8, the second balloon 10 and the third balloon 11 are 6 mm, 8 mm and 10 mm, or 10 mm, 12 mm and 14 mm, or 14 mm, 16 mm and 18 mm, or 18 mm, 20 mm and 22 mm respectively.

[0062] The common bile duct is cannulated and the papillary sphincter is incised, and a guide wire is placed in the common bile duct. When in use, the guide wire is inserted through the first channel of the present invention, and the guide wire is led out through the fourth connector 74. Under guidance, the guide wire is inserted into the duodenal papilla through the duodenoscope forceps channel, and contrast agents are injected through the first connector, the second connector 72, and the third connector 73 in sequence, and the first balloon 8, the second balloon 10, and the third balloon 11 are filled in sequence to expand the duodenal papilla sphincter step by step. The scheme of the present invention for stepwise expansion of the duodenal papilla can increase the range of expansion of the duodenal papilla sphincter, reduce the incidence of papillary tearing and bleeding, and have low production costs.

[0063] 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 multi-stage duodenal papilla dilatation balloon catheter, characterized in that: It comprises a balloon assembly, a catheter, an injection-molded connector (6) connected to the catheter, and a connecting pipe joint (7), wherein the catheter is connected to the connecting pipe joint (7) via the injection-molded connector (6); The balloon group comprises a first balloon (8), a second balloon (10) and a third balloon (11) which are stacked in sequence, the two ends of the first balloon (8), the second balloon (10) and the third balloon (11) are conical, and the middle body is cylindrical; the length of the first balloon (8) is shorter than the length of the second balloon (10), and the length of the second balloon (10) is shorter than the length of the third balloon (11); the head ends of the first balloon (8), the second balloon (10) and the third balloon (11) are flush and are all fixed to the catheter by a first metal ring; the tail ends of the first balloon (8), the second balloon (10) and the third balloon (11) are fixed to the catheter by a second metal ring, a third metal ring and a fourth metal ring respectively; The catheter comprises a first drainage tube segment (1), a second drainage tube segment (2), a third drainage tube segment (3), a fourth drainage tube segment (4) and a fifth drainage tube segment (5) which are connected in sequence; The first drainage tube section (1) is a single-channel tube, provided with a first channel therein for inserting a guide wire; The second drainage tube section (2) is a double-channel tube, attached to the first balloon (8), and provided with a second channel (21) and a third channel (22) connected to the first channel; the head end of the second channel (21) is a blind end, and is connected to the first balloon (8) via a first side hole opened on the tube wall of the second drainage tube section (2); The third drainage tube section (3) is a three-channel tube, provided with a fourth channel (31), a fifth channel (32) connected to the second channel (21), and a sixth channel (33) connected to the third channel (22); the third drainage tube section (3) and the second drainage tube section (2) are jointly attached to the second balloon (10), the head end of the fourth channel (31) is a blind end, and is connected to the second balloon (10) through a second side hole opened on the tube wall of the third drainage tube section (3); The fourth drainage tube segment (4) is a four-channel tube, provided with a seventh channel (41), an eighth channel (42) connected to the fourth channel (31), a ninth channel (43) connected to the fifth channel (32), and a tenth channel (44) connected to the sixth channel (33); the fourth drainage tube segment (4) is attached to the third balloon (11) together with the second drainage tube segment (2) and the third drainage tube segment (3); the head end of the seventh channel (41) is a blind end, and is connected to the third balloon (11) through a third side hole opened on the tube wall of the fourth drainage tube segment (4); The fifth drainage pipe section (5) is an extension tube of the fourth drainage pipe section (4), and is a four-channel tube, in which the seventh channel (41), the eighth channel (42), the ninth channel (43) and the tenth channel (44) are arranged; the side of the fifth drainage pipe section (5) connected to the fourth drainage pipe section (4) is curved, and the bending angle θ is 45°; the other side of the fifth drainage pipe section (5) is connected to the injection molded connector (6), and the injection molded connector (6) is a polyethylene molded structure; the angle between the fourth drainage pipe section (4) and the bent straight pipe of the fifth drainage pipe section (5) is 45°; The connecting pipe joint (7) comprises a first connecting joint (71), a second connecting head (72), a third connecting head (73) and a fourth connecting head (74), all of which are single-channel joints; the seventh channel (41), the eighth channel (42), the ninth channel (43) and the tenth channel (44) are respectively connected to the third connecting head (73), the second connecting head (72), the first connecting joint (71) and the fourth connecting head (74).

2. The multi-stage duodenal papilla dilatation balloon catheter according to claim 1, characterized in that: The outer diameter of the catheter is 7 to 8.5 Fr; the total length of the catheter is 180 cm.

3. The multi-stage duodenal papilla dilatation balloon catheter according to claim 1 or 2, characterized in that: The diameter of the first channel is 1 mm.

4. The multi-stage duodenal papilla dilatation balloon catheter according to claim 1 or 2, characterized in that: The diameters of the second channel (21), the fourth channel (31) and the seventh channel (41) respectively connected to the balloons are equal, and are all 0.3 mm.

5. The multi-stage duodenal papilla dilatation balloon catheter according to claim 4, characterized in that: The length of the first balloon (8) is 3 cm, the length of the second balloon (10) is 3.5 cm, and the length of the third balloon (11) is 4 cm; The expanded diameters of the first balloon (8), the second balloon (10) and the third balloon (11) are 6 mm, 8 mm and 10 mm, or 10 mm, 12 mm and 14 mm, or 14 mm, 16 mm and 18 mm, or 18 mm, 20 mm and 22 mm respectively.

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