Support diameter adjusting device and TIPS support system

Abstract

The invention provides a stent diameter adjusting device and a TIPS stent system.The stent diameter adjusting device comprises a sealing bag conveying catheter and at least two sealing bags installed on the sealing bag conveying catheter, and the sealing bags are distributed in the axial direction of the sealing bag conveying catheter at intervals; a catheter inner cavity extending in the axial direction is formed in the sealing bag conveying catheter, a connecting opening is formed in one end of the sealing bag conveying catheter, and the connecting opening is communicated with the sealing bags and gaps between the adjacent sealing bags through the catheter inner cavity. According to the stent diameter adjusting device and the TIPS stent system, the diameter of the TIPS stent can be adjusted.

Description

Technical Field

[0001] The present invention relates to a medical device, and more particularly to a stent diameter adjusting device and a TIPS stent system. Background Art

[0002] Transjugular intrahepatic portosystemic shunt (TIPS) is one of the main methods for treating portal hypertension and its complications. Using interventional radiology techniques, a shunt is established between the right hepatic vein or the middle hepatic vein and the portal vein branch under digital subtraction angiography or ultrasound guidance, and a metal or covered stent is placed to shunt the portal vein blood flow, thereby reducing the portal vein pressure. TIPS has definite curative effects on esophageal and gastric variceal rupture bleeding, refractory ascites, refractory pleural effusion, hepatorenal syndrome, etc. caused by portal hypertension. The most ideal shunt is one that can provide an effect of sufficiently reducing the portal vein pressure, maintain the patency of the shunt, and at the same time avoid the risk of hepatic encephalopathy and acute liver failure due to excessive shunting of portal vein blood in patients, which affects the quality of life and long-term prognosis of patients.

[0003] The diameter of the TIPS stent plays a decisive role in changing the portal vein pressure. The larger the diameter of the TIPS shunt, the better the effect of reducing the portal vein pressure. However, a large amount of blood will bypass the liver, and the proportion of filtered blood is small, so that a large amount of unfiltered blood and toxic molecules enter the brain, and the incidence of hepatic encephalopathy will also be higher, resulting in hospitalization and reduced survival rate of patients.

[0004] Once the existing TIPS stent is deployed, balloon-expanded or inflated, the diameter of the TIPS stent cannot be reduced. When it is found that the diameter of the TIPS stent is too large and needs to be reduced, the diameter of the TIPS stent cannot be adjusted any more, resulting in a relatively high incidence of hepatic encephalopathy.

[0005] Therefore, it is necessary to provide a stent diameter adjusting device to reduce the diameter of medical stents such as TIPS stents after placement, so as to adjust the portal vein pressure and treat or avoid hepatic encephalopathy, etc. Summary of the Invention

[0006] The purpose of the present invention is to provide a stent diameter adjusting device and a TIPS stent system to solve the problem that the diameter of medical stents such as TIPS stents cannot be adjusted after implantation in the prior art.

[0007] On the one hand, the present invention provides a stent diameter adjustment device, including a sealed capsule delivery catheter and at least two sealed capsules mounted on the sealed capsule delivery catheter. The sealed capsules are spaced apart along the axial direction of the sealed capsule delivery catheter. An axially extending catheter lumen is provided in the sealed capsule delivery catheter. One end of the sealed capsule delivery catheter is provided with a connection port, and the connection port communicates with the sealed capsules and the sealed capsule voids respectively through the catheter lumen.

[0008] The stent diameter adjustment device involved in the present invention has the following beneficial effects:

[0009] During use, when it is necessary to reduce the diameter of a set part of a medical stent such as a TIPS stent, the present stent diameter adjustment device is placed into the medical stent until the void between the sealed capsules corresponds to the set part of the medical stent. Then, physiological saline or the like is perfused into the sealed capsules until the sealed capsules expand to the set state, so that the sealed capsules are in contact with the inner wall of the medical stent. At this time, a closed space is formed between the voids between adjacent sealed capsules and the inner wall of the medical stent. The blood at the closed space is sucked out of the body through the connection port communicating with the void between the sealed capsules by a suction device. The pressure at the closed space decreases, and the set part of the medical stent contracts inward under the action of the internal and external pressure difference, realizing the reduction of the diameter of the set part of the medical stent to meet the corresponding requirements. In addition, when it is necessary to increase the diameter of the set part of the medical stent, on the basis of forming the above-mentioned closed space, physiological saline is injected into the closed space through the connection port communicating with the void between the sealed capsules. The pressure at the closed space increases, and the set part of the medical stent expands outward under the action of the internal and external pressure difference, realizing the increase of the diameter of the set part of the medical stent.

[0010] Preferably, a first sealed capsule and a second sealed capsule are mounted on the sealed capsule delivery catheter. An axially extending first catheter lumen, second catheter lumen and third catheter lumen are provided in the sealed capsule delivery catheter. The connection port includes a first sealed capsule perfusion port, a second sealed capsule perfusion port and a pressure adjustment port. The first sealed capsule perfusion port communicates with the first sealed capsule through the first catheter lumen. The second sealed capsule perfusion port communicates with the second sealed capsule through the second catheter lumen. A pipe wall hole communicating with the sealed capsule void is provided on the side wall of the sealed capsule delivery catheter, and the pressure adjustment port communicates with the pipe wall hole through the third catheter lumen.

[0011] Preferably, a guide wire cavity is provided in the sealed capsule delivery catheter. The guide wire cavity extends along the axial direction of the sealed capsule delivery catheter. The guide wire cavity is used for threading a guide wire, so as to smoothly guide the sealed capsule delivery catheter and the first sealed capsule and the second sealed capsule into the set position in the medical stent by using the guide wire.

[0012] Preferably, a developer is provided on the sealing capsule delivery catheter, and at least one developer is a void position developer, which corresponds to the sealing capsule void along the length direction of the sealing capsule delivery catheter. During the process of inserting the stent diameter adjusting device of the present invention into a medical stent, based on the imaging function of the void position developer, the doctor can accurately understand the positions of the void position developer and the sealing capsule void in the medical stent, and thus can help the doctor accurately adjust the sealing capsule void to a position corresponding to the part of the medical stent where the diameter is to be adjusted.

[0013] Preferably, a developer is provided on the sealing capsule delivery catheter, and two developers are respectively a first capsule position developer and a second capsule position developer. The first capsule position developer and the second capsule position developer are spaced apart along the axial direction of the sealing capsule delivery catheter. Both the first sealing capsule and the second sealing capsule are located between the first capsule position developer and the second capsule position developer. The first capsule position developer and the second capsule position developer are respectively located on the distal side of the first sealing capsule and the proximal side of the second sealing capsule. During the process of inserting the stent diameter adjusting device of the present invention into a medical stent, based on the imaging functions of the first capsule position developer and the second capsule position developer, it can help the doctor more accurately understand the positions of the first sealing capsule and the second sealing capsule in the medical stent, and thus can help the doctor accurately adjust the first sealing capsule and the second sealing capsule to the set positions.

[0014] Preferably, the developer is in a ring shape and is sleeved on the sealing capsule delivery catheter. With this structural design and assembly form of the developer, it can effectively prevent the developer from falling off the sealing capsule delivery catheter.

[0015] Preferably, both the first sealing capsule and the second sealing capsule are balloon catheters. In this way, when the first sealing capsule and the second sealing capsule are inflated with physiological saline to the set state, both the first sealing capsule and the second sealing capsule can form a good sealing fit with the inner wall of the medical stent.

[0016] Preferably, both the first sealing capsule and the second sealing capsule are non-compliant balloon catheters or semi-compliant balloon catheters.

[0017] On the other hand, the present invention provides a TIPS stent system, including a TIPS stent, the TIPS stent includes a stent and a membrane, and the TIPS stent system further includes the stent diameter adjusting device.

[0018] The TIPS stent system of the present invention has the following beneficial effects:

[0019] Based on the stent diameter adjusting device, the present TIPS stent system can adjust the diameter of the TIPS stent, especially can reduce the diameter of the TIPS stent to meet the corresponding requirements.

[0020] Preferably, the stent is a non-self-expanding stent made of stainless steel, cobalt-chromium alloy, or nickel-titanium alloy to ensure that the stent has high strength.

[0021] Preferably, the material of the membrane is polyethylene terephthalate, polytetrafluoroethylene, or expanded polytetrafluoroethylene. The membrane with such a material has excellent anti-leakage performance. Brief Description of the Drawings

[0022] Figure 1 It is a schematic structural diagram of the stent diameter adjusting device in the embodiment of the present invention when the imaging member is removed;

[0023] Figure 2 It is a schematic structural diagram of the stent diameter adjusting device in the embodiment of the present invention;

[0024] Figure 3 It is a schematic structural diagram of the stent diameter adjusting device in the TIPS stent in the embodiment of the present invention;

[0025] Figure 4 It is a schematic structural diagram of the stent diameter adjusting device in the embodiment of the present invention when reducing the diameter of the membrane-covered stent section of the TIPS stent;

[0026] Figure 5 It is a schematic structural diagram of the TIPS stent in the initial deployment state in the embodiment of the present invention;

[0027] Figure 6 It is a schematic structural diagram of the TIPS stent in the state where the diameter of the membrane-covered stent section is reduced in the embodiment of the present invention;

[0028] Figure 7 It is a schematic structural diagram of the stent diameter adjusting device in the embodiment of the present invention when increasing the diameter of the TIPS stent;

[0029] Figure 8 It is a schematic structural diagram of the TIPS stent in the state where the diameter of the membrane-covered stent section is increased in the embodiment of the present invention.

[0030] Reference numerals in the drawings:

[0031] 100, sealing balloon delivery catheter; 101, guide wire hole; 200, first catheter lumen; 201, first sealing balloon; 202, first sealing balloon perfusion port; 204, first balloon position imaging member; 300, third catheter lumen; 301, wall hole; 302, pressure adjustment port; 304, void position imaging member; 400, second catheter lumen; 401, second sealing balloon; 402, second sealing balloon perfusion port; 404, second balloon position imaging member; 500, TIPS stent; 501, membrane-covered stent section; 502, stent; 503, membrane; 600, gap between the sealing balloons. Detailed Description of the Embodiments

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely below. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meanings as understood by those of ordinary skill in the art to which the present invention pertains. The words such as "including" used herein mean that the elements or items appearing before this word cover the elements or items listed after this word and their equivalents, without excluding other elements or items.

[0033] In the embodiments of the present application, "distal end" refers to the end far from the operator during surgical operation, and "proximal end" refers to the end close to the operator during surgical operation.

[0034] As Figure 1 shown, this embodiment provides a stent diameter adjusting device, which includes a sealed balloon delivery catheter 100 and at least two sealed balloons installed on the sealed balloon delivery catheter 100. The sealed balloons are distributed at intervals along the axial direction of the sealed balloon delivery catheter 100. A catheter inner cavity extending axially is provided in the sealed balloon delivery catheter 100. A connection port is provided at the proximal end of the sealed balloon delivery catheter 100, and the connection port communicates with the sealed balloons and the gap 600 between adjacent sealed balloons through the catheter inner cavity respectively.

[0035] In one embodiment, there are 2 sealed balloons, including a first sealed balloon 201 installed on the sealed balloon delivery catheter 100 and a second sealed balloon 401 installed on the sealed balloon delivery catheter 100. The first sealed balloon 201 and the second sealed balloon 401 are distributed at intervals along the axial direction of the sealed balloon delivery catheter 100. A first catheter inner cavity 200, a second catheter inner cavity 400, and a third catheter inner cavity 300 are provided in the sealed balloon delivery catheter 100. The first catheter inner cavity 200, the second catheter inner cavity 400, and the third catheter inner cavity 300 extend along the axial direction of the sealed balloon delivery catheter 100. The connection port provided at the proximal end of the sealed balloon delivery catheter 100 includes a first sealed balloon perfusion port 202, a second sealed balloon perfusion port 402, and a pressure adjustment port 302. The first sealed balloon perfusion port 202 communicates with the first sealed balloon 201 through the first catheter inner cavity 200. The second sealed balloon perfusion port 402 communicates with the second sealed balloon 401 through the second catheter inner cavity 400. A tube wall hole 301 communicating with the sealed balloon gap 600 is provided on the side wall of the sealed balloon delivery catheter 100, and the pressure adjustment port 302 communicates with the tube wall hole 301 through the third catheter inner cavity 300. It should be noted that the axial direction of the sealed balloon delivery catheter 100 refers to the length direction of the sealed balloon delivery catheter 100.

[0036] In use, when it is necessary to reduce the diameter of the set part of the TIPS stent 500, the stent diameter adjusting device of the present invention is placed into the TIPS stent 500 until the gap 600 between the sealing sacs corresponds to the set part of the TIPS stent 500. Then, physiological saline or the like is infused into the first sealing sac infusion port 202, and the physiological saline can be injected into the first sealing sac 201 through the inner cavity 200 of the first catheter until the first sealing sac 201 expands to the set state, and at this time, the first sealing sac 201 is in close contact with the inner wall of the TIPS stent 500; physiological saline or the like is infused into the second sealing sac infusion port 402, and the physiological saline can be injected into the second sealing sac 401 through the inner cavity 400 of the second catheter until the second sealing sac 401 expands to the set state. At this time, the second sealing sac 401 is in close contact with the inner wall of the TIPS stent 500, and a closed space is formed among the first sealing sac 201, the second sealing sac 401, and the inner wall of the TIPS stent 500. As Figure 1 and Figure 3 shown, this closed space includes the pore between the first sealing sac 201 and the second sealing sac 401, that is, the gap 600 between the sealing sacs. The pressure regulating port 302 is aspirated by an aspiration device, and the blood at the closed space will be aspirated out of the body through the tube wall holes 301 and the inner cavity 300 of the third catheter. The pressure at the closed space decreases, and the set part of the TIPS stent 500 contracts inward under the action of the internal and external pressure difference, realizing the reduction of the diameter of the set part of the TIPS stent 500. As Figure 4 and Figure 6 shown, to meet the corresponding requirements. In addition, when it is necessary to increase the diameter of the set part of the TIPS stent 500, on the basis of forming the above-mentioned closed space, physiological saline or the like is infused into the pressure regulating port 302, and the physiological saline can be injected into the closed space through the inner cavity 300 of the third catheter and the tube wall holes 301. The pressure at the closed space increases, and the set part of the TIPS stent 500 expands outward under the action of the internal and external pressure difference, realizing the increase of the diameter of the set part of the TIPS stent 500. As Figure 7 and Figure 8 shown.

[0037] Meanwhile, the present embodiment provides a TIPS stent system, as Figure 3 shown, including the TIPS stent 500, as Figure 5 shown. The TIPS stent 500 includes a stent 502 and a membrane 503. The TIPS stent system further includes the stent diameter adjusting device.

[0038] This TIPS stent system, based on the stent diameter adjusting device, can adjust the diameter of the TIPS stent 500, especially can reduce the diameter of the TIPS stent 500 to meet the corresponding requirements.

[0039] In addition, after adjusting the diameter of the set part of the TIPS stent 500 to the set size in this embodiment, the physiological saline in the first sealing capsule 201 is aspirated out through the first sealing capsule perfusion port 202 by means of an aspiration device, and the first sealing capsule 201 is in a contracted state; and the physiological saline in the second sealing capsule 401 is aspirated out through the second sealing capsule perfusion port 402 by the aspiration device, and the second sealing capsule 401 is in a contracted state, so that the first sealing capsule 201 and the second sealing capsule 401 are withdrawn from the TIPS stent 500 through the sealing capsule delivery catheter 100. A shunt channel is formed in the TIPS stent 500. In this way, the adjustment of the size of the shunt channel is realized, and further the adjustment of the portal vein pressure is realized.

[0040] As Figure 1 shown, in this embodiment, the sealing capsule delivery catheter 100 is provided with an axially penetrating guide wire cavity (not shown) and a guide wire hole 101 is formed at the distal end. The guide wire cavity and the guide wire hole 101 are used for threading a guide wire, so as to be able to use the guide wire to guide the sealing capsule delivery catheter 100 and the first sealing capsule 201 and the second sealing capsule 401 to smoothly enter the set position in the TIPS stent 500. In this embodiment, the end of the sealing capsule delivery catheter 100 provided with the guide wire hole 101 is the distal end, and the position of the first sealing capsule 201 on the sealing capsule delivery catheter 100 is farther than that of the second sealing capsule 401. During the process of inserting the stent diameter adjusting device into the TIPS stent 500, under the guidance of the guide wire, the distal end of the sealing capsule delivery catheter 100 first enters the TIPS stent 500, and drives the first sealing capsule 201 and the second sealing capsule 401 thereon to enter the TIPS stent 500 in sequence until the first sealing capsule 201 and the second sealing capsule 401 move to the set position in the TIPS stent 500.

[0041] In this embodiment, a visualization member is provided on the sealing capsule delivery catheter 100. As Figure 2 shown, there is a visualization member for void position, which is the void position visualization member 304. The void position visualization member 304 corresponds to the sealing capsule void 600 along the axial direction of the sealing capsule delivery catheter 100. At the same time, in this embodiment, there are also two visualization members on the sealing capsule delivery catheter 100. As Figure 2As shown, the two developing members are respectively the first bladder position developing member 204 and the second bladder position developing member 404. The first bladder position developing member 204 and the second bladder position developing member 404 are axially spaced along the sealed bladder delivery catheter 100, and both the first sealed bladder 201 and the second sealed bladder 401 are located between the first bladder position developing member 204 and the second bladder position developing member 404. Specifically, the first bladder position developing member 204 is located on the distal side of the first sealed bladder 201, the second bladder position developing member 404 is located on the proximal side of the second sealed bladder 401, the void position developing member 304 is located on the distal side of the tube wall hole 301, and the position of the first bladder position developing member 204 on the sealed bladder delivery catheter 100 is farther than that of the second bladder position developing member 404. During the process of inserting the stent diameter adjusting device of the present invention into the TIPS stent 500, based on the imaging functions of the three developing members, it can help the doctor more accurately understand the positions of the first sealed bladder 201, the second sealed bladder 401, the sealed bladder void 600 and the tube wall hole 301 in the TIPS stent 500, and further help the doctor accurately adjust the first sealed bladder 201 and the second sealed bladder 401 to the set positions. In addition, in this embodiment, the developing member is annular, and the developing member is sleeved on the sealed bladder delivery catheter 100. This kind of structural design and assembly form of the developing member can effectively prevent the developing member from falling off the sealed bladder delivery catheter 100.

[0042] As Figure 3 shown, in this embodiment, both the first sealed bladder 201 and the second sealed bladder 401 are balloons. In this way, when the first sealed bladder 201 and the second sealed bladder 401 are inflated with normal saline to the set state, both the first sealed bladder 201 and the second sealed bladder 401 can form a good sealing fit relationship with the inner wall of the TIPS stent 500. And in this embodiment, both the first sealed bladder 201 and the second sealed bladder 401 are non-compliant balloons or semi-compliant balloons.

[0043] In this embodiment, the stent can be made of a variety of materials. The stent can be made of stainless steel, cobalt-chromium alloy, or nickel-titanium alloy. And the material of the film is polyethylene terephthalate (abbreviation PET), polytetrafluoroethylene (abbreviation PTFE), or expanded polytetrafluoroethylene (abbreviation ePTFE). The film with this kind of material has excellent anti-leakage performance.

[0044] In this embodiment, the TIPS stent 500 is specifically a balloon-expandable TIPS covered stent, a non-self-expanding stent. In this embodiment, the TIPS stent 500 can undergo permanent plastic deformation under an external force. The diameter of the covered stent section 501 of the TIPS stent 500 is adjusted by using the stent diameter adjusting device, so that the current diameter of the covered stent section 501 is greater than or less than the initial deployed diameter of the covered stent section 501, and multiple adjustments can be made until the diameter of the TIPS stent 500 reaches the limit. The covered stent section 501 is the set part of the above-mentioned TIPS stent 500.

[0045] In addition, when increasing the diameter of the TIPS stent 500 in this embodiment, normal saline can be specifically injected into the pressure adjustment port 302 by using a syringe to increase the diameter of the TIPS stent 500; when decreasing the diameter of the TIPS stent 500, the pressure adjustment port 302 can be specifically aspirated by using a suction pump to extract the blood at the sealed space.

[0046] The pressure difference required to reduce the diameter of the TIPS stent 500 in this embodiment is greater than normal physiological conditions (for example, the maximum blood pressure of the human body) to ensure that the TIPS stent 500 after diameter reduction can maintain the adjusted diameter under physiological condition pressure.

[0047] The stent diameter adjustment device in this embodiment can adjust the diameter of the TIPS stent 500, thereby adjusting the flow rate and pressure of the blood flowing through the TIPS stent 500, improving the shunt channel flow rate, adjusting the portal vein pressure, improving the treatment quality, and reducing the complication rate. Specifically, by reducing the diameter of the TIPS stent 500, the cross-sectional area of the shunt channel can be reduced, the blood flow in the stent can be decreased, and the blood flow through the liver can be increased, thereby improving hepatic encephalopathy. After the diameter of the TIPS stent 500 is increased, as long as the hepatic tissue does not cause the TIPS stent 500 to collapse, the TIPS stent 500 will remain in the expanded shape without being damaged.

[0048] In other embodiments, if the initial deployment diameter of the TIPS stent 500 cannot meet the flow rate requirements of the shunt channel and it is necessary to further expand the diameter of the TIPS stent 500 to increase the flow rate and reduce the pressure, another balloon device can also be selected for further expansion.

[0049] In this embodiment, if necessary, the position of the stent diameter adjustment device in the TIPS stent 500 can be moved to adjust the diameters of multiple positions in the TIPS stent 500 respectively to adjust the overall diameter of the TIPS stent 500, and further adjust the pressure difference or flow rate across the entire TIPS stent 500.

[0050] In this embodiment, the maximum balloon diameter or aspiration pressure is selected such that the diameter of the covered stent section 501 is within the range formed by the maximum limit value and the minimum limit value, and the minimum diameter can be 10% - 30% of the initial deployment diameter. For example, if the initial deployment diameter of the TIPS stent 500 is 8 mm or 10 mm, if the diameter of the TIPS stent 500 is too large, it can be reduced to 6 mm or less; if the shunt effect of the TIPS stent 500 is not ideal, it can be expanded to 12 mm, etc. The diameter adjustment operation can be repeated as needed to set an appropriate diameter. In other embodiments, the maximum balloon diameter and aspiration pressure can be selected such that the diameter of the covered stent section 501 is within the range formed by the maximum limit value and the minimum limit value.

[0051] By using the TIPS stent system in this embodiment, doctors can adjust the size of the shunt channel by adjusting the diameter of the TIPS stent 500, and flexibly and conveniently adjust the pressure difference or flow rate on the entire stent graft, thereby adjusting the pressure of the portal vein. Specifically, reducing the flow rate of the shunt channel increases the blood flow through the liver, and after filtration by the liver, the incidence of hepatic encephalopathy is reduced; or more significantly increasing the flow rate of the shunt channel reduces the portal vein pressure and improves or enhances the treatment effect of TIPS. In addition, based on the actual needs of the patient, this measurement and adjustment can be performed at the initial implantation or at any other time after the operation.

[0052] It should be noted that the number of the above-mentioned sealing capsules is not limited to 2, and can be 3 or more. When there are 3 sealing capsules, 2 closed spaces are formed between the sealing capsules and the inner wall of the TIPS stent 500. The blood at the closed spaces can be aspirated respectively to reduce the diameter of the set part of the TIPS stent 500, or physiological saline can be injected into the closed spaces respectively to increase the diameter of the set part of the TIPS stent 500, so as to adjust the pressure of the portal vein and treat or avoid hepatic encephalopathy, etc. When the number of the sealing capsules changes, at this time, the number and position of the imaging parts change accordingly, which will not be elaborated here.

[0053] In addition, this embodiment specifically takes the TIPS stent 500 as an example to illustrate the working principle of the stent diameter adjustment device as above, that is, the medical stent in this embodiment is specifically the TIPS stent 500; in other embodiments, the medical stent can also be a medical stent other than the TIPS stent 500. Based on the above design, this stent diameter adjustment device can not only adjust the diameter of the TIPS stent 500, but also adjust the diameter of other types of medical stents.

[0054] Although the embodiments of the present invention have been described in detail above, it will be obvious to those skilled in the art that various modifications and variations can be made to these embodiments. However, it should be understood that such modifications and variations are all within the scope and spirit of the present invention as described in the claims. Moreover, the present invention described herein can have other embodiments and can be implemented or realized in various ways.

Claims

1. A stent diameter adjusting device, characterized in that, it includes a sealed capsule delivery catheter and at least two sealed capsules installed on the sealed capsule delivery catheter. The sealed capsules are spaced apart along the axial direction of the sealed capsule delivery catheter. An axially extending catheter inner cavity is provided in the sealed capsule delivery catheter. One end of the sealed capsule delivery catheter is provided with a connection port, and the connection port communicates with the sealed capsules and the gaps between adjacent sealed capsules respectively through the catheter inner cavity.

2. The stent diameter adjusting device according to claim 1, characterized in that, a first sealed capsule and a second sealed capsule are installed on the sealed capsule delivery catheter. An axially extending first catheter inner cavity, a second catheter inner cavity and a third catheter inner cavity are provided in the sealed capsule delivery catheter. The connection port includes a first sealed capsule perfusion port, a second sealed capsule perfusion port and a pressure adjustment port. The first sealed capsule perfusion port communicates with the first sealed capsule through the first catheter inner cavity. The second sealed capsule perfusion port communicates with the second sealed capsule through the second catheter inner cavity. A pipe wall hole communicating with the sealed capsule gap is provided on the side wall of the sealed capsule delivery catheter, and the pressure adjustment port communicates with the pipe wall hole through the third catheter inner cavity.

3. The stent diameter adjusting device according to claim 1, characterized in that, an axially penetrating guide wire cavity is provided in the sealed capsule delivery catheter for threading a guide wire.

4. The stent diameter adjusting device according to claim 1, characterized in that, a developing member is provided on the sealed capsule delivery catheter. At least one developing member is a gap position developing member, and the gap position developing member corresponds to the gap between the sealed capsules along the axial direction of the sealed capsule delivery catheter.

5. The stent diameter adjusting device according to claim 2, characterized in that, a developing member is provided on the sealed capsule delivery catheter. Two developing members are a first capsule position developing member and a second capsule position developing member, which are respectively located on the distal side of the first sealed capsule and the proximal side of the second sealed capsule.

6. The stent diameter adjusting device according to claim 4 or 5, characterized in that, the developing member is annular, and the developing member is sleeved on the sealed capsule delivery catheter.

7. The stent diameter adjusting device according to claim 1, characterized in that, both the first sealed capsule and the second sealed capsule are balloon catheters.

8. A TIPS stent system, including a TIPS stent, and the TIPS stent includes a stent and a film, characterized in that, the TIPS stent system further includes the stent diameter adjusting device according to any one of claims 1 to 7.

9. The TIPS stent system according to claim 8, characterized in that, the stent is a non-self-expanding stent, made of stainless steel, cobalt-chromium alloy, or nickel-titanium alloy.

10. The TIPS stent system according to claim 8, characterized in that, the material of the film is polyethylene terephthalate, polytetrafluoroethylene, or expanded polytetrafluoroethylene.

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