CN216365444U

CN216365444U - A mounting system for passing through intrahepatic portosystemic reposition of redundant personnel of neck

Info

Publication number: CN216365444U
Application number: CN202121402551.2U
Authority: CN
Inventors: 徐如涛; 翟水亭
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-06-23
Filing date: 2021-06-23
Publication date: 2022-04-26
Anticipated expiration: 2031-06-23

Abstract

The utility model discloses a stent system for transcervical intrahepatic portosystemic shunt, which comprises a first covered stent and second covered stents arranged at two ends of the first covered stent, wherein films for covering the first covered stent and the second covered stent are respectively arranged on the first covered stent and the second covered stent, the first covered stent is made of extensible materials, guide pipes are respectively sleeved on the two second covered stents, the guide pipes are metal net pipes woven by nickel-titanium alloy, the end parts of the two guide pipes far away from the first covered stent respectively extend out of the second covered stent, and the stent system comprises a plurality of first covered stents with different diameters; the utility model simplifies the operation process of the combined stent, shortens the operation time, can be applied in a personalized way according to the specific situation of a patient, prevents the hepatic encephalopathy, and simultaneously can avoid the internal work loss of the stent caused by the stimulation of vascular endothelial hyperplasia or thrombosis due to the overhard near and far ends of the stent.

Description

A mounting system for passing through intrahepatic portosystemic reposition of redundant personnel of neck

Technical Field

The utility model relates to the field of medical equipment, in particular to a stent system for transcervical intrahepatic portosystemic shunt.

Background

Transjugular intrahepatic portosystemic shunt (abbreviated as TIPS or TIPSS by English acronym) is firstly reported by Rosch in 1969, Richter is clinically used for the first time in 1989, and after more than 30 years of development, the TIPS technology is mature, is widely applied to treatment of portal hypertension such as esophageal and gastric variceal bleeding, refractory ascites, Budd-Chiari syndrome and the like, prevention of fatal complications during waiting for donors before liver transplantation and the like, and achieves remarkable curative effect. At present, only the viator stent system (researched, developed and marketed in 2003) is approved to be applied to TIPS surgery at home and abroad, the viator stent cannot be widely applied in most cases at home due to the limitation of objective conditions, and the viator stent is replaced by a combination of a covered stent and a bare stent which are already marketed, and the application of the viator stent is generally determined by an operator according to experience. Whether the viator stent system or the combi stent system is specifically applied to TIPS, the following disadvantages and shortcomings currently exist:

(1) after the stent is implanted, the near end is usually in the hepatic vein or the inferior vena cava, and the stent (the tectorial membrane end of the VIATOR stent or the near end of the combined stent) is hard and is easy to repeatedly stimulate to cause hyperplasia of the intima of the hepatic vein and the inferior vena cava, so that the near end of the stent is narrow or blocked after a certain time, and the TIPS stent loses function (the loss of function for short) and can cause portal vein pressure to rise again to cause portal hypertension complications such as alimentary tract hemorrhage, hepatic chest/ascites, hepatorenal syndrome and the like);

(2) angulation of the proximal end of the stent with the hepatic vein or inferior vena cava (commonly known as "capping") causes unsmooth blood flow in the stent, thereby causing failure of the TIPS stent;

(3) the distal end of the combined stent extends into the portal vein or the left and right trunks thereof, and because the head end of the naked stent is generally hard and is easy to repeatedly rub and stimulate with the portal vein end to cause intimal hyperplasia or thrombosis, thereby causing stent failure, part of operators only apply one covered stent to perform TIPS (tip transplantation), and the phenomenon and the 'capping' phenomenon are almost inevitable;

(4) the TIPS stent systems applied in China at present are all self-expandable, the inner diameters of the stents are all non-adjustable, and the inner diameters of the stents are generally considered to be naturally expanded to the standard inner diameter of the stent after a certain time, so that the controllability is not provided, the TIPS stent systems cannot be applied individually to patients with different weights, heights and liver functions, and the hepatic encephalopathy is more easily caused;

(5) the prior combined stent system needs to exchange and send the stent for a plurality of times, thereby prolonging the operation time and increasing the potential operation risk. .

SUMMERY OF THE UTILITY MODEL

Aiming at the problems, the utility model provides a stent system for transcervical intrahepatic portosystemic shunt, which avoids the problem that the two ends of the stent are too hard to stimulate vascular endothelial hyperplasia or thrombosis to cause work loss in the stent and also solves the problem that the stent is not adjustable.

The technical scheme of the utility model is as follows:

a stent system for transcervical intrahepatic portosystemic shunt comprises a first covered stent and second covered stents arranged at two ends of the first covered stent, wherein films for covering the first covered stent and the second covered stent are respectively arranged on the first covered stent and the second covered stent, the first covered stent is made of extensible materials, guide tubes are respectively sleeved on the two second covered stents, the guide tubes are metal mesh tubes woven by nickel-titanium alloy, and the two guide tubes extend to the direction far away from the end parts of the corresponding first covered stents and respectively extend to the outside of the corresponding second covered stents;

the stent system includes a plurality of first stent-grafts of different diameters.

The working principle of the technical scheme is as follows:

the first tectorial membrane stent, the second tectorial membrane stent and the guide tube are compressed in the stent delivery sheath, the first tectorial membrane stent expands after being released, the guide tube is soft and can naturally conform to the shape of a blood vessel, and the function of guiding blood flow is achieved, wherein the diameter of the first tectorial membrane stent used by a patient can be confirmed according to a series of indexes such as the liver function, the height and the weight of the preoperative patient.

The utility model simplifies the operation process of the combined stent, shortens the operation time, can be applied in a personalized way according to the specific situation of a patient, prevents the hepatic encephalopathy, and simultaneously can avoid the internal work loss of the stent caused by the stimulation of vascular endothelial hyperplasia or thrombosis due to the overhard near and far ends of the stent.

In a further aspect, the first stent graft and the second stent graft are both made of nitinol.

In a further aspect, the film is composed of an organic polymer.

In a further technical scheme, the lengths of the first covered stent and the second covered stent are both 10mm-20 mm.

The utility model has the beneficial effects that:

1. the operation process of the combined bracket is simplified, and the operation time is shortened;

2. the individual application is realized according to the height, the weight and the liver function condition of a patient, the hepatic encephalopathy after the operation can be avoided as much as possible by selecting the material with smaller diameter, if the shunting effect is not ideal, the material can be expanded to the diameter more meeting the requirements of the illness state in the second stage;

3. the guide tube is soft and can naturally conform to the shape of a blood vessel, thereby playing a role in guiding blood flow;

4. the guide tube can well guide blood flow to enter a hepatic vein or an inferior vena cava from a portal vein, and avoids the internal work loss of the stent caused by the fact that the two ends of the stent are too hard to stimulate vascular endothelial hyperplasia or thrombosis in the past;

5. the power loss after the TIPS stent is implanted is reduced, the probability of secondary intervention is reduced, and the requirements of health and economy are better met.

Drawings

FIG. 1 is a schematic diagram of the overall configuration of a stent system for transcervical intrahepatic portosystemic shunt according to an embodiment of the present invention;

FIG. 2 is a state diagram of a stent system for transcervical intrahepatic portosystemic shunt according to an embodiment of the present invention.

Description of reference numerals:

10. a first stent graft; 11. a second stent graft; 12. a guide tube; 13. a film.

Detailed Description

The embodiments of the present invention will be further described with reference to the accompanying drawings.

Example (b):

as shown in fig. 1-2, a stent system for transcervical intrahepatic portosystemic shunt, which can be understood from the composition as polymers of stents with different functions and different structures, thereby serving the overall efficacy of the stent, comprises a first stent graft 10 and second stent grafts 11 arranged at both ends of the first stent graft 10, wherein the second stent grafts 11 are strip-shaped and have lengths of 20mm, films 13 covering the first stent graft 10 and the second stent grafts 11 are respectively arranged on the first stent graft 10 and the second stent grafts 11, the first stent graft 10 is made of a metal (nickel-titanium alloy) with ductility, the two second stent grafts 11 and a guide tube 12 are connected with each other by fastening wavy metal rings, the guide tube 12 is a metal mesh tube woven from the nickel-titanium alloy, the end parts of the two guide tubes 12 far away from the first stent graft 10 respectively extend out of the second stent grafts 11, the skeletons of the first tectorial membrane stent 10 and the second tectorial membrane stent 11 are connected through the tectorial membrane stent;

the stent system comprises a plurality of first stent grafts 10 with different diameters, wherein the largest first stent graft 10 has an inner diameter of 8mm, and the final inner diameter of the stent graft after implantation in the body is determined by the selected diameter of the first stent graft 10, and the final shape is a coaxial hollow cylinder.

The working principle of the technical scheme is as follows:

the first stent graft 10, the second stent graft 11 and the guide tube 12 are compressed in the stent delivery sheath, the first stent graft 10 expands after release, and the guide tube 12 is flexible and can naturally conform to the shape of a blood vessel to play a role in guiding blood flow, wherein the diameter of the first stent graft 10 used by a patient can be confirmed according to a series of indexes such as the liver function, the height, the weight and the like of the patient before an operation.

In the embodiment, by adopting the technical scheme, the operation time is shortened, the stent system can be applied in a personalized manner according to the specific conditions of patients, the hepatic encephalopathy is prevented, and the condition that the stent loses work in the stent due to the fact that the near and far ends of the stent are too hard to stimulate vascular endothelial hyperplasia or thrombosis in the past can be avoided.

In another embodiment, the skeletons of the first stent graft 10 and the second stent graft 11 are made of nitinol.

In another embodiment, the membrane 13 is made of an organic polymer, which may be PTFE, polyurethane.

In another embodiment, the first stent graft and the second stent graft are each 10mm to 20mm in length.

The above-mentioned embodiments only express the specific embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.

Claims

1. A stent system for transcervical intrahepatic portosystemic shunt is characterized by comprising a first covered stent and second covered stents arranged at two ends of the first covered stent, wherein films covering the first covered stent and the second covered stent are respectively arranged on the first covered stent and the second covered stent, the first covered stent is made of an extensible material, guide tubes are respectively sleeved on the two second covered stents, the guide tubes are metal mesh tubes woven by nickel-titanium alloy, and the two guide tubes extend to the direction far away from the end parts of the corresponding first covered stents and respectively extend to the outside of the corresponding second covered stents;

2. The stent system for transcervical intrahepatic portosystemic shunt of claim 1, wherein the first and second stent-grafts are each comprised of nitinol.

3. The stent system for transcervical intrahepatic portosystemic shunt of claim 1, wherein said membrane is comprised of an organic polymer.

4. The stent system for transcervical intrahepatic portosystemic shunt of claim 1, wherein the first stent graft and the second stent graft are each 10mm to 20mm in length.