Stent diameter adjusting device and tips stent system

Abstract

This invention provides a stent diameter adjustment device and a TIPS stent system. The stent diameter adjustment device includes a sealing bladder delivery conduit and at least two sealing bladders mounted on the sealing bladder delivery conduit. The sealing bladders are spaced apart along the axial direction of the sealing bladder delivery conduit. The sealing bladder delivery conduit has an axially extending inner cavity, and one end of the sealing bladder delivery conduit has a connection port that communicates with the sealing bladders and the gaps between adjacent sealing bladders through the inner cavity of the conduit. This stent diameter adjustment device and TIPS stent system can adjust the diameter of the TIPS stent.

Description

Technical Field

[0001] This invention relates to a medical device, and more particularly to a stent diameter adjustment device and a TIPS stent system. Background Technology

[0002] Transjugular intrahepatic portalsystemic shunt (TIPS) is one of the main methods for treating portal hypertension and its complications. Using interventional radiology techniques, under the guidance of digital subtraction angiography or ultrasound, a shunt is created between the right hepatic vein or middle hepatic vein and a branch of the portal vein. A metal or covered stent is placed to divert portal venous blood flow, thereby reducing portal venous pressure. TIPS is effective for esophageal and gastric variceal bleeding, refractory ascites, refractory pleural effusion, and hepatorenal syndrome caused by portal hypertension. The ideal shunt should provide sufficient reduction in portal venous pressure, maintain patency, and avoid the risk of hepatic encephalopathy and acute liver failure due to excessive portal venous blood shunting, thus affecting the patient's quality of life and long-term prognosis.

[0003] The diameter of the TIPS stent plays a decisive role in altering portal vein pressure. The larger the diameter of the TIPS shunt, the better the effect of reducing portal pressure. However, this results in a large amount of blood bypassing the liver, with a smaller proportion of filtered blood. This allows a large amount of unfiltered blood and toxic molecules to enter the brain, increasing the incidence of hepatic encephalopathy, leading to hospitalization and reduced survival rates.

[0004] Once a TIPS stent is loosened or inflated by a balloon, its diameter cannot be reduced. When it is found that the TIPS stent diameter is too large and needs to be reduced, it is impossible to further reduce the diameter of the TIPS stent, resulting in a higher incidence of hepatic encephalopathy.

[0005] Therefore, there is a need to provide a stent diameter adjustment device that can reduce the diameter of medical stents such as TIPS stents after placement, thereby regulating portal vein pressure and treating or preventing hepatic encephalopathy. Summary of the Invention

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

[0007] On one hand, the present invention provides a support diameter adjustment device, including a sealing bladder delivery conduit and at least two sealing bladders installed on the sealing bladder delivery conduit. The sealing bladders are spaced apart along the axial direction of the sealing bladder delivery conduit. The sealing bladder delivery conduit has an axially extending conduit lumen. One end of the sealing bladder delivery conduit is provided with a connection port, which communicates with the sealing bladder and the gap of the sealing bladder through the conduit lumen.

[0008] The bracket diameter adjustment device of the present invention has the following beneficial effects:

[0009] In use, when it is necessary to reduce the diameter of the set part of a medical stent such as a TIPS stent, the stent diameter adjustment device is inserted into the medical stent until the gap between the sealing sacs corresponds to the set part of the medical stent. Saline solution is then injected into the sealing sacs until they expand to the set state, allowing them to adhere to the inner wall of the medical stent. At this point, a sealed space is formed between the gaps between adjacent sealing sacs and the inner wall of the medical stent. Blood in this sealed space is then aspirated through a connection port communicating with the gaps between the sealing sacs. The pressure in this sealed space decreases, causing the set part of the medical stent to contract inwards under the pressure difference, thus reducing the diameter of the set part to meet the required size. Conversely, when it is necessary to increase the diameter of the set part of the medical stent, after forming the aforementioned sealed space, saline solution is injected into the sealed space through the connection port communicating with the gaps between the sealing sacs. The pressure in this sealed space increases, causing the set part of the medical stent to expand outwards under the pressure difference, thus increasing the diameter of the set part.

[0010] Preferably, the sealing bladder delivery conduit is equipped with a first sealing bladder and a second sealing bladder. The sealing bladder delivery conduit has an axially extending first conduit lumen, a second conduit lumen, and a third conduit lumen. The connection port includes a first sealing bladder infusion port, a second sealing bladder infusion port, and a pressure regulating port. The first sealing bladder infusion port communicates with the first sealing bladder through the first conduit lumen, and the second sealing bladder infusion port communicates with the second sealing bladder through the second conduit lumen. The side wall of the sealing bladder delivery conduit is provided with a tube wall hole communicating with the gap of the sealing bladder, and the pressure regulating port communicates with the tube wall hole through the third conduit lumen.

[0011] Preferably, the sealing sac delivery catheter is provided with a guidewire cavity, which extends along the axial direction of the sealing sac delivery catheter. The guidewire cavity is used to insert a guidewire so that the sealing sac delivery catheter and the first and second sealing sacs can be smoothly guided into the medical stent at the designated position.

[0012] Preferably, the sealing sac delivery conduit is provided with a contrast agent, at least one of which is a gap position contrast agent, and the gap position contrast agent corresponds to the gap of the sealing sac along the length of the sealing sac delivery conduit. During the insertion of this stent diameter adjustment device into the medical stent, based on the contrast function of the gap position contrast agent, the doctor can accurately understand the position of the gap position contrast agent and the gap of the sealing sac within the medical stent, thereby helping the doctor accurately adjust the gap of the sealing sac to correspond to the position of the diameter to be adjusted on the medical stent.

[0013] Preferably, the sealing sac delivery conduit is provided with two imaging elements: a first sac position imaging element and a second sac position imaging element. These two elements are spaced apart along the axial direction of the sealing sac delivery conduit, with both the first and second sealing sacs located between them. The first and second sac position imaging elements are located at the distal end of the first sealing sac and the proximal end of the second sealing sac, respectively. During the insertion of this stent diameter adjustment device into the medical stent, the imaging function of the first and second sac position imaging elements helps the doctor more accurately understand the positions of the first and second sealing sacs within the medical stent, thereby enabling the doctor to accurately adjust the first and second sealing sacs to the set positions.

[0014] Preferably, the developing element is annular and is sleeved on the sealed bladder delivery conduit. This structural design and assembly of the developing element effectively prevents it from detaching from the sealed bladder delivery conduit.

[0015] Preferably, both the first and second sealing sacs are balloons. This ensures that when the first and second sealing sacs are inflated to a predetermined state by injecting saline solution, both sacs can form a good sealing fit with the inner wall of the medical stent.

[0016] Preferably, both the first sealing bladder and the second sealing bladder are non-compliant or semi-compliant balloons.

[0017] On the other hand, the present invention provides a TIPS stent system, including a TIPS stent, the TIPS stent including a support and a coating, and the TIPS stent system further including a stent diameter adjustment device.

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

[0019] This TIPS support system, based on a support diameter adjustment device, can adjust the diameter of the TIPS support, especially to reduce the diameter of the TIPS support to meet specific requirements.

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

[0021] Preferably, the membrane is made of polyethylene terephthalate, polytetrafluoroethylene, or expanded polytetrafluoroethylene. Membranes made of such materials exhibit excellent leak-proof properties. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the support diameter adjustment device when the developing element is removed in an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the support diameter adjustment device in an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the support diameter adjustment device in the TIPS support according to an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the structure of the stent diameter adjustment device in an embodiment of the present invention when the diameter of the covered stent section of the TIPS stent is reduced;

[0026] Figure 5 This is a schematic diagram of the TIPS support in its initial deployed state in an embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of the TIPS stent in the case of a reduced diameter stent section according to an embodiment of the present invention;

[0028] Figure 7 This is a schematic diagram of the structure of the support diameter adjustment device when the diameter of the TIPS support is increased in an embodiment of the present invention;

[0029] Figure 8 This is a schematic diagram of the TIPS stent in the case of an embodiment of the present invention with the diameter of the covered stent section increased.

[0030] Numbering on the map:

[0031] 100. Sealed bladder delivery catheter; 101. Guide wire hole; 200. First catheter inner lumen; 201. First sealed bladder; 202. First sealed bladder infusion port; 204. First bladder position imaging element; 300. Third catheter inner lumen; 301. Tube wall hole; 302. Pressure regulating port; 304. Gap position imaging element; 400. Second catheter inner lumen; 401. Second sealed bladder; 402. Second sealed bladder infusion port; 404. Second bladder position imaging element; 500. TIPS support; 501. Covered support section; 502. Support; 503. Cover; 600. Gap between sealed bladders. Detailed Implementation

[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 clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art. The terms "comprising" and similar expressions used herein mean that the element or object preceding the word covers the element or object listed after the word and its equivalents, but does not exclude other elements or objects.

[0033] In the embodiments of this application, "distal end" refers to the end away from the operator during the surgical procedure, and "proximal end" refers to the end closer to the operator during the surgical procedure.

[0034] like Figure 1 As shown, this embodiment provides a stent diameter adjustment device, including a sealing bladder delivery conduit 100 and at least two sealing bladders installed on the sealing bladder delivery conduit 100. The sealing bladders are spaced apart along the axial direction of the sealing bladder delivery conduit 100. The sealing bladder delivery conduit 100 has an axially extending conduit lumen. The proximal end of the sealing bladder delivery conduit 100 is provided with a connection port, which communicates with the sealing bladders and the gaps 600 between adjacent sealing bladders through the conduit lumen.

[0035] In one embodiment, two sealing bladders are provided, including a first sealing bladder 201 installed on the sealing bladder delivery conduit 100 and a second sealing bladder 401 installed on the sealing bladder delivery conduit 100. The first sealing bladder 201 and the second sealing bladder 401 are distributed at intervals along the axial direction of the sealing bladder delivery conduit 100. The sealing bladder delivery conduit 100 is provided with a first conduit lumen 200, a second conduit lumen 400, and a third conduit lumen 300. The first conduit lumen 200, the second conduit lumen 400, and the third conduit lumen 300 extend along the axial direction of the sealing bladder delivery conduit 100. The sealing bladder delivery conduit 100 has a connection port located at its proximal end, including a first sealing bladder infusion port 202, a second sealing bladder infusion port 402, and a pressure regulating port 302. The first sealing bladder infusion port 202 communicates with the first sealing bladder 201 through the inner cavity 200 of the first conduit, and the second sealing bladder infusion port 402 communicates with the second sealing bladder 401 through the inner cavity 400 of the second conduit. The side wall of the sealing bladder delivery conduit 100 has a wall hole 301 communicating with the sealing bladder gap 600, and the pressure regulating port 302 communicates with the wall hole 301 through the inner cavity 300 of the third conduit. It is worth noting that the axial direction of the sealing bladder delivery conduit 100 refers to its length direction.

[0036] In use, when it is necessary to reduce the diameter of the set part of the TIPS stent 500, the stent diameter adjustment device is placed into the TIPS stent 500 until the gap 600 between the sealing bladders corresponds to the set part of the TIPS stent 500. Physiological saline solution is then infused into the first sealing bladder infusion port 202. The saline solution is injected into the first sealing bladder 201 through the inner lumen 200 of the first catheter until the first sealing bladder 201 expands to the set state, at which point the first sealing bladder 201 is tightly fitted to the inner wall of the TIPS stent 500. Similarly, physiological saline solution is infused into the second sealing bladder infusion port 402. The saline solution is injected into the second sealing bladder 401 through the inner lumen 400 of the second catheter until the second sealing bladder 401 expands to the set state, at which point the second sealing bladder 401 is tightly fitted to the inner wall of the TIPS stent 500. A sealed space is formed between the first sealing bladder 201, the second sealing bladder 401, and the inner wall of the TIPS stent 500. Figure 1 and Figure 3 As shown, the sealed space includes a gap 600 between the first sealing sac 201 and the second sealing sac 401. By using a suction device to aspirate through the pressure regulating port 302, blood in the sealed space is drawn out through the tube wall hole 301 and the inner lumen 300 of the third catheter. The pressure in the sealed space decreases, and the setting part of the TIPS stent 500 contracts inward under the pressure difference, thus reducing the diameter of the setting part of the TIPS stent 500. Figure 4 and Figure 6 As shown, this meets the corresponding requirements. Additionally, when it is necessary to increase the diameter of the setting portion of the TIPS stent 500, based on the aforementioned sealed space, saline solution is infused into the pressure regulating port 302. The saline solution can be injected into the sealed space through the inner lumen 300 of the third catheter and the tube wall hole 301. The pressure in the sealed space increases, and the setting portion of the TIPS stent 500 expands outward under the action of the internal and external pressure difference, thereby increasing the diameter of the setting portion of the TIPS stent 500. Figure 7 and Figure 8 As shown.

[0037] Meanwhile, this embodiment provides a TIPS support system, such as Figure 3 As shown, including the TIPS bracket 500, such as Figure 5 As shown, the TIPS support 500 includes a support 502 and a film 503, and the TIPS support system also includes the support diameter adjustment device.

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

[0039] In addition, in this embodiment, after adjusting the diameter of the designated portion of the TIPS stent 500 to the set size, the saline solution in the first sealed sac 201 is aspirated through the first sealed sac infusion port 202 using an aspiration device, causing the first sealed sac 201 to contract. Similarly, the saline solution in the second sealed sac 401 is aspirated through the second sealed sac infusion port 402 using the aspiration device, causing the second sealed sac 401 to contract. Thus, the first sealed sac 201 and the second sealed sac 401 are withdrawn from the TIPS stent 500 through the sealed sac delivery catheter 100. A shunt channel is formed within the TIPS stent 500, thereby allowing adjustment of the shunt channel size and consequently, regulation of portal vein pressure.

[0040] like Figure 1 As shown, in this embodiment, the sealing bladder delivery conduit 100 has an axially penetrating guidewire cavity (not shown) and a guidewire hole 101 formed at its distal end. The guidewire cavity and guidewire hole 101 are used to insert a guidewire, allowing the guidewire to smoothly guide the sealing bladder delivery conduit 100, the first sealing bladder 201, and the second sealing bladder 401 into the predetermined position within the TIPS stent 500. In this embodiment, the end of the sealing bladder delivery conduit 100 with the guidewire hole 101 is the distal end, and the position of the first sealing bladder 201 on the sealing bladder delivery conduit 100 is further away than that of the second sealing bladder 401. During the insertion of the stent diameter adjustment device into the TIPS stent 500, guided by the guidewire, the distal end of the sealing bladder delivery conduit 100 first enters the TIPS stent 500, subsequently driving the first sealing bladder 201 and the second sealing bladder 401 into the TIPS stent 500 in sequence, until the first sealing bladder 201 and the second sealing bladder 401 move to the predetermined position within the TIPS stent 500.

[0041] In this embodiment, the sealing bladder delivery conduit 100 is equipped with a imaging element, such as... Figure 2 As shown, there is one developing element, namely the gap position developing element 304, which corresponds to the gap 600 of the sealing bladder along the axial direction of the sealing bladder delivery conduit 100. In this embodiment, there are also two developing elements on the sealing bladder delivery conduit 100, such as... Figure 2As shown, the two imaging elements are a first bladder position imaging element 204 and a second bladder position imaging element 404, which are distributed at intervals along the axial direction of the sealed bladder delivery conduit 100. Both the first sealed bladder 201 and the second sealed bladder 401 are located between the first bladder position imaging elements 204 and 404. Specifically, the first bladder position imaging element 204 is located on the distal side of the first sealed bladder 201, the second bladder position imaging element 404 is located on the proximal side of the second sealed bladder 401, and the gap position imaging element 304 is located on the distal side of the tube wall hole 301. Furthermore, the first bladder position imaging element 204 is located further away from the second bladder position imaging element 404 on the sealed bladder delivery conduit 100. During the insertion of the stent diameter adjustment device into the TIPS stent 500, the imaging function of the three imaging elements helps the doctor more accurately understand the positions of the first sealing sac 201, the second sealing sac 401, the sealing sac gap 600, and the tube wall hole 301 within the TIPS stent 500. This, in turn, helps the doctor accurately adjust the first sealing sac 201 and the second sealing sac 401 to the set position. Furthermore, in this embodiment, the imaging element is annular and is fitted onto the sealing sac delivery conduit 100. This structural design and assembly method effectively prevents the imaging element from detaching from the sealing sac delivery conduit 100.

[0042] like Figure 3 As shown, in this embodiment, both the first sealing bladder 201 and the second sealing bladder 401 are balloons. Thus, when the first sealing bladder 201 and the second sealing bladder 401 are inflated to a set state by injecting physiological saline, both can form a good sealing fit with the inner wall of the TIPS stent 500. Furthermore, in this embodiment, both the first sealing bladder 201 and the second sealing bladder 401 are non-compliant or semi-compliant balloons.

[0043] In this embodiment, the support can be made of various materials, including stainless steel, cobalt-chromium alloy, or nickel-titanium alloy. The coating material is polyethylene terephthalate (PET), polytetrafluoroethylene (PTFE), or expanded polytetrafluoroethylene (ePTFE). Coatings made of these materials offer excellent leak-proof properties.

[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 external force. The diameter of the covered stent segment 501 of the TIPS stent 500 is adjusted using a stent diameter adjustment device, so that the current diameter of the covered stent segment 501 is greater than or less than the initial deployed diameter of the covered stent segment 501. This adjustment can be performed multiple times until the diameter of the TIPS stent 500 reaches its limit. The covered stent segment 501 is the designated location of the aforementioned TIPS stent 500.

[0045] In addition, in this embodiment, when the diameter of the TIPS stent 500 is increased, physiological saline can be injected into the pressure regulating port 302 using a syringe to increase the diameter of the TIPS stent 500; when the diameter of the TIPS stent 500 is decreased, a suction pump can be used to aspirate the pressure regulating port 302 to extract blood from the sealed space.

[0046] In this embodiment, the pressure difference required to reduce the diameter of the TIPS stent 500 is greater than that required under normal physiological conditions (e.g., the maximum blood pressure of a human body) to ensure that the TIPS stent 500 with a reduced diameter can maintain the adjusted diameter under physiological pressure.

[0047] In this embodiment, the stent diameter adjustment device can adjust the diameter of the TIPS stent 500, thereby regulating the flow and pressure of blood flowing through the TIPS stent 500, improving shunt flow, adjusting portal vein pressure, improving treatment quality, and reducing the incidence of complications. Specifically, by reducing the diameter of the TIPS stent 500, the cross-sectional area of ​​the shunt can be reduced, decreasing blood flow within the stent and increasing blood flow through the liver, thereby improving hepatic encephalopathy. When the diameter of the TIPS stent 500 is increased, as long as the liver tissue does not cause the TIPS stent 500 to collapse, the TIPS stent 500 will remain in its expanded shape without being damaged.

[0048] In other embodiments, if the initial expansion diameter of the TIPS stent 500 cannot meet the flow 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, further expansion can also be performed by selecting another balloon device.

[0049] In this embodiment, if necessary, the diameter of multiple positions in the TIPS bracket 500 can be adjusted by moving the bracket diameter adjustment device within the TIPS bracket 500, thereby adjusting the overall diameter of the TIPS bracket 500 and consequently adjusting the pressure difference or flow rate on the entire TIPS bracket 500.

[0050] In this embodiment, the maximum balloon diameter or aspiration pressure is selected so that the diameter of the covered stent segment 501 is within the range defined by the maximum and minimum limits. The minimum diameter can be 10% to 30% of the initial deployed diameter. For example, the initial deployed 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 smaller; if the shunt effect of the TIPS stent 500 is not ideal, it can be expanded to 12 mm, etc. Multiple diameter adjustments can be performed as needed to set an appropriate diameter. In other embodiments, the maximum balloon diameter and aspiration pressure can be selected so that the diameter of the covered stent segment 501 is within the range defined by the maximum and minimum limits.

[0051] Using the TIPS stent system in this embodiment, physicians can adjust the shunt size by adjusting the diameter of the TIPS stent 500, flexibly and conveniently adjusting the pressure differential or flow rate across the entire stent graft, thereby regulating portal vein pressure. Specifically, reducing shunt flow increases blood flow through the liver, reducing the incidence of hepatic encephalopathy after filtration; or more significantly increases shunt flow, lowering portal vein pressure and improving or enhancing the therapeutic effect of TIPS. Furthermore, based on the patient's actual needs, this measurement and adjustment can be performed either at the initial implantation or at any other time post-surgery.

[0052] It is worth noting that the number of sealing sacs in the above embodiments is not limited to two; it can be three or more. When there are three sealing sacs, two sealed spaces are formed between the sealing sacs and the inner wall of the TIPS stent 500. Blood can be aspirated from these sealed spaces to reduce the diameter of the designated area of ​​the TIPS stent 500, or saline solution can be injected into these sealed spaces to increase the diameter of the designated area of ​​the TIPS stent 500. This can regulate portal vein pressure and treat or prevent hepatic encephalopathy, etc. When the number of sealing sacs changes, the number and position of the imaging elements change accordingly, which will not be elaborated here.

[0053] Furthermore, this embodiment specifically uses the TIPS stent 500 as an example to explain the working principle of the stent diameter adjustment device. Specifically, in this embodiment, the medical stent is the TIPS stent 500; in other embodiments, the medical stent can be any type of medical stent other than the TIPS stent 500. Based on the above design, this stent diameter adjustment device not only adjusts the diameter of the TIPS stent 500 but also adjusts the diameter of other types of medical stents.

[0054] While embodiments of the present invention have been described in detail above, it will be apparent 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 fall within the scope and spirit of the invention as set forth in the claims. Furthermore, the invention described herein may have other embodiments and can be implemented or carried out in various ways.

Claims

1. A stent diameter adjustment device, characterized by, The device includes a sealing bladder delivery conduit, at least a first sealing bladder and a second sealing bladder mounted on the sealing bladder delivery conduit. The sealing bladders are spaced apart along the axial direction of the sealing bladder delivery conduit. The sealing bladder delivery conduit has an axially extending first conduit lumen, a second conduit lumen, and a third conduit lumen. One end of the sealing bladder delivery conduit is provided with a connection port, which includes a first sealing bladder infusion port, a second sealing bladder infusion port, and a pressure regulating port. The first sealing bladder infusion port communicates with the first sealing bladder through the first conduit lumen, and the second sealing bladder infusion port communicates with the second sealing bladder through the second conduit lumen. The side wall of the sealing bladder delivery conduit has a tube wall hole communicating with the gap of the sealing bladder, and the pressure regulating port communicates with the tube wall hole through the third conduit lumen. A suction device is used to suction through the pressure regulating port to adjust the pressure of the sealing bladder gap, thereby adjusting the support diameter. The sealing bladder delivery conduit is provided with a developing element, at least one of which is a gap position developing element, which corresponds to the gap between the sealing bladders along the axial direction of the sealing bladder delivery conduit.

2. The stent diameter adjustment device of claim 1, wherein, The sealed bladder delivery conduit has an axially penetrating guide wire cavity for inserting the guide wire.

3. The stent diameter adjustment device of claim 2, wherein, The sealing bladder delivery conduit is equipped with imaging elements, including two imaging elements: a first bladder position imaging element and a second bladder position imaging element, located at the distal end of the first sealing bladder and the proximal end of the second sealing bladder, respectively.

4. The stent diameter adjusting device according to claim 1 or 3, wherein The developing element is ring-shaped and is sleeved on the sealed bladder delivery conduit.

5. The device of claim 1, wherein the device is configured to adjust the diameter of the stent by a distance of about 0.1 mm to about 2.0 mm. Both the first and second sealing bladders are balloons.

6. A TIPS stent system comprising a TIPS stent, the TIPS stent comprising a stent and a covering, characterized in that, The TIPS support system also includes the support diameter adjustment device as described in any one of claims 1 to 5.

7. The TIPS stent system of claim 6, wherein, The support is a non-self-expanding support, made of stainless steel, cobalt-chromium alloy, or nickel-titanium alloy.

8. The TIPS stent system of claim 6, wherein, The coating material is polyethylene terephthalate, polytetrafluoroethylene, or expanded polytetrafluoroethylene.

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