CN115414166A - TIPS stent release retraction structures and methods - Google Patents

Abstract

Embodiments of the present invention provide a TIPS stent release retraction structure and method, which relate to the field of TIPS stents. It aims to improve the problem that the stent cannot be retracted after being released. The TIPS stent release retraction structure includes a stent, an outer layer of suture and an inner layer of suture; the outer layer of suture is wound and connected to the outside of the stent to compress the stent to its original state; the inner layer of suture is wound through the stent on the Pores, inner sutures are used to simultaneously relax during the release of the stent, or inner sutures are used to compress the stent from the deployed state to the initial state under tension. The release and withdrawal method of the TIPS stent is implemented by using the above-mentioned structure. When the outer suture is released, the stent will expand due to its self-expanding properties. If the release position of the stent needs to be adjusted during the operation, the released stent can be compressed to the initial state through the inner suture. If the position of the stent is adjusted accurately, The inner suture is then released and the stent is released again.

Description

TIPS stent release retraction structure and method

technical field

The invention relates to the field of TIPS stents, in particular to a TIPS stent release retraction structure and method.

Background technique

With the improvement of people's living standards and changes in lifestyle, the incidence of peripheral vascular diseases is increasing. If these diseases are not treated in time, they may cause blood vessel blockage and seriously endanger human life. At present, minimally invasive interventional surgery is mainly used. This type of method has the characteristics of less trauma to patients, high safety, and high effectiveness. It has been affirmed by doctors and patients and has become an important treatment method for peripheral vascular diseases. Especially in TIPS surgery, interventional therapy has become very common.

Interventional treatment refers to the implantation of internal stents in the vascular lesion segment. The implanted internal stents can support the stenosis and occlusion of blood vessels, reduce the elastic retraction and reshaping of blood vessels, maintain smooth blood flow in the lumen, and also have the effect of preventing restenosis. effect. "TIPS surgery mainly refers to the transjugular intrahepatic portosystemic stent shunt. Its principle is to use special interventional treatment equipment, under the guidance of X-ray fluoroscopy, through the jugular vein approach, to establish the liver located in the hepatic vein and portal vein. The artificial shunt channel between the main branches, and maintain its permanent patency with the metal internal stent. After reducing the portal hypertension, control and prevent the rupture and bleeding of the esophageal and gastric fundus veins, and promote the absorption of ascites. The main indication is portal hypertension Patients with esophageal-gastric varices rupture and bleeding caused by conservative treatment should adopt this treatment method.

During minimally invasive stent placement, the main tools are the stent and the supporting stent delivery system. Usually, the stent is a nickel-titanium tube laser-cut or nickel-titanium wire braided structure, and the covering material is ePTFE. The doctor judges the length and diameter of the stenotic segment of the blood vessel under imaging equipment, and selects a stent with appropriate specifications. The stent is preloaded into the stent delivery system, and placed at the distal end of the stenosis under image guidance. After the delivery system is retracted, the stent will self-expand after release and establish a portosystemic shunt to reduce portal pressure. The key to this operation is to be able to quickly and accurately select a suitable stent according to the surgical needs, and during the stent release process, the stent release device can be accurately positioned. The stent is released at a suitable position in the puncture channel, and the effect of reducing portal hypertension can be achieved after the stent is released. Otherwise, due to the wrong release position of the stent, the stent cannot reduce the high pressure or cause bile leakage, which will not achieve the expected surgical effect or even fail the operation or cause Hepatic encephalopathy and other complications.

Once the current stent product is released, it cannot be retracted again. If the doctor releases the stent at an inaccurate position during the operation, the second adjustment cannot be performed during the operation, and the effect of reducing the portal vein pressure cannot be achieved, which usually leads to surgery. s failure.

Contents of the invention

The purpose of the present invention includes, for example, to provide a TIPS stent release retraction structure, which can solve the problem that the stent cannot be retracted after release.

The object of the present invention also includes providing a TIPS stent release and withdrawal method, which can.

Embodiments of the present invention can be realized like this:

Embodiments of the present invention provide a TIPS stent release retraction structure, including a stent, outer sutures and inner sutures;

The outer suture is wound and connected to the outside of the stent to compress the stent to an initial state; the outer suture is used to release the stent from the initial state to the initial state in the released state. expanded state;

The inner layer of sutures is wound through the pores on the stent, and the inner layer of sutures is used for synchronous relaxation during the release process of the stent, or the inner layer of sutures is used for tensioning The stent is compressed from the expanded state to the initial state under the condition of the inner layer suture, or the inner suture is used to release the stent from the initial state to the expanded state in the released state.

In addition, the TIPS stent release retraction structure provided by the embodiments of the present invention may also have the following additional technical features:

Optionally, the outer sutures are sewn on the stent along the length direction of the stent; the outer sutures are used to be broken sequentially under the tension of the stent.

Optionally, the outer sutures are sutured in a rice bag style.

Optionally, the material of the outer suture is polypropylene or polyester; the thickness of the outer suture is in the range of 0.5-1.5mm.

Optionally, the stent includes a first row of pores and a second row of pores opposite in position and arranged along the length direction of the stent; the inner suture is used to cross through the first row of pores and the A second row of apertures to compress the stent under tension.

Optionally, the bracket includes a first end and a second end opposite to each other;

The inner suture includes a first suture segment and a second suture segment connected to each other; the first suture segment crosses through the first row along the direction from the first end to the second end pores and the second row of pores; the second suture segment crosses through the first row of pores and the second row of pores along the direction from the second end to the first end; the first row of pores A suture segment intersects with the second suture segment.

Optionally, the first row of pores includes a plurality of first pores arranged at intervals along the length direction of the stent, and the second row of pores includes a plurality of second pores arranged at intervals along the length direction of the stent. Pores; the plurality of first pores are set in one-to-one correspondence with the plurality of second pores.

Optionally, the material of the inner suture is polypropylene or polyester, and the thickness of the inner suture is 2-2.5 mm.

Optionally, the inner suture is provided with a retraction part and a release part, the retraction part is used to operate to tighten the inner suture, and the release part is used to operate the inner suture to release.

The embodiment of the present invention also provides a method for releasing and withdrawing the TIPS stent. The TIPS stent release and retraction structure is adopted to implement, and the TIPS stent release and retraction method includes the following steps:

delivering the stent to the lesion site;

releasing the outer layer of sutures to allow release of the stent;

If the release position of the stent deviates from the lesion position, then tighten the inner suture to move the stent after it is compressed to the initial state, and release the inner suture after moving in place, so as to The stent is released.

The beneficial effects of the TIPS stent release retraction structure and method of the embodiment of the present invention include, for example:

TIPS stent release retraction structure, including stent, outer suture and inner suture; the outer suture is wound and connected to the outside of the stent to compress the stent to its original state; the outer suture is used to release the stent in the released state , so that the stent is released from the initial state to the deployed state; the inner suture is wound through the pores on the stent, and the inner suture is used for synchronous relaxation during the release of the stent, or the inner suture is used for pulling The stent is compressed from the expanded state to the initial state under tight conditions, or the inner suture is used to release the stent from the initial state to the expanded state under the released state.

When the outer suture is released, the stent is unfolded, and the stent is gradually released; when the outer suture is released, the inner suture is in a relaxed mesh state. If the release position of the stent needs to be adjusted during the operation, the inner suture can be adjusted through the inner suture. The suture is retracted to the bracket again: the inner suture is tightened, and the bracket in the released state can be compressed to the initial state. If the position of the bracket is adjusted accurately at this time, the inner suture is released and the bracket is released again. If the release position of the stent is incorrect or the expected effect of the operation is not achieved, the device can quickly adjust the position of the released stent, and proceed to the next operation, effectively improving the success rate of the operation.

The stent release and withdrawal method is implemented by using the TIPS stent release and withdrawal structure to improve the problem that the stent cannot be withdrawn after release.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and thus It should be regarded as a limitation on the scope, and those skilled in the art can also obtain other related drawings based on these drawings without creative work.

FIG. 1 is a schematic structural view of a delivery device delivering a TIPS stent release retraction structure provided by an embodiment of the present invention;

Fig. 2 is a schematic structural view of the stent and the inner suture provided by the embodiment of the present invention;

Fig. 3 is the first suture mode of the outer layer suture provided by the embodiment of the present invention;

Fig. 4 is the second suture mode of the outer layer suture provided by the embodiment of the present invention;

5 is a schematic diagram of the inner layer suture in a relaxed state when the stent is released according to the embodiment of the present invention;

Fig. 6 is a schematic diagram of an inner suture compression stent provided by an embodiment of the present invention;

Fig. 7 is a block diagram of the steps of the stent release and withdrawal method provided by the embodiment of the present invention.

Icons: 10-TIPS stent release retraction structure; 100-stent; 110-pore; 111-first end; 112-second end; 200-outer suture; 300-inner suture; 310-first suture Line segment; 320-second suture segment; 400-delivery device; 410-retraction; 420-release.

detailed description

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 It is a part of embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

It should be noted that like numerals and letters denote similar items in the following figures, therefore, once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of the present invention, it should be noted that if the orientation or positional relationship indicated by the terms "upper", "lower", "inner" and "outer" appear, it is based on the orientation or positional relationship shown in the drawings, or It is the orientation or positional relationship that the invention product is usually placed in use, and it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation , and therefore cannot be construed as a limitation of the present invention.

In addition, terms such as "first" and "second" are used only for distinguishing descriptions, and should not be understood as indicating or implying relative importance.

It should be noted that, in the case of no conflict, the features in the embodiments of the present invention may be combined with each other.

The TIPS stent release retraction structure 10 provided in this embodiment will be described in detail below with reference to FIGS. 1 to 7 .

Please refer to FIG. 1 to FIG. 7 , an embodiment of the present invention provides a TIPS stent release retraction structure 10, including a stent 100, an outer suture 200 and an inner suture 300; the outer suture 200 is wound and connected to the stent 100 to compress the stent 100 to its initial state; the outer suture 200 is used to release the stent 100 from the initial state to the deployed state in the released state; the inner suture 300 is wound through the stent 100 pore 110, the inner layer suture 300 is used to simultaneously relax during the release process of the stent 100, or the inner layer suture 300 is used to compress the stent 100 from the expanded state to the initial state under tension, or the inner layer The suture 300 is used to release the stent 100 from the initial state to the deployed state in the released state.

The "initial state" of the stent 100 is the state in which the stent 100 is compressed, and the "expanded state" of the stent 100 is the state in which the stent 100 is released. The TIPS stent release retraction structure 10 is delivered to the lesion site through the delivery device 400 . The first release is achieved by the outer suture 200, the first compression is achieved by the inner suture 300, and the second release is achieved.

Outer sutures 200 are provided on the outside of the stent 100 , and inner sutures 300 are provided on the inside of the stent 100 . The outer layer of suture 200 is wound on the outside of the stent 100 , and the inner layer of suture 300 is composed of intertwined coils, passed through the pores 110 of the stent 100 , and sewed on the inner surface of the stent 100 .

The outer suture 200 has two states, the first state is wrapped around the outside of the stent 100, and is used to compress the stent 100 to be delivered into the body; the second state is the released state, the stent 100 can be released and expanded, wherein, the outer The released state of the layer suture 200 includes a relaxed state or a state of being disconnected from the stent 100 . The inner layer suture 300 has three states. In the first state, as shown in FIG. In the state where the suture 200 is released; in the second state, as shown in FIG. The release of the compressed stent 100, the release of the inner suture 300 includes a relaxed state, which does not interfere with the release of the stent 100, or a disconnected state, which is separated from the stent 100, so that the stent 100 can be released.

Specifically, when the outer suture 200 is released, the stent 100 expands due to the self-expanding properties of the material. At this time, the state of the stent 100 is shown in FIG. Release: the inner suture 300 is sewn on the inner surface of the stent 100. When the outer suture 200 is released, the inner suture 300 is in a relaxed mesh state as shown in FIG. 2 . If the release position of the stent 100 needs to be adjusted during the operation, the retracted stent 100 can be compressed again through the inner suture 300 at this time; once the inner suture 300 is tightened, the stent 100 in the released state can be compressed to the initial state, and the compressed status. Then adjust the position of the stent 100. If the position of the stent 100 is adjusted accurately at this time, the inner suture 300 is tightened for the second time. At this time, the inner suture 300 is disconnected, and the stent 100 is released again. That is to say, the tensioning of the compression stent 100 by the inner suture 300 and the release of the stent 100 are realized by tightening the inner suture 300 .

During the operation, if the release position of the stent 100 is not correct or does not achieve the expected effect of the operation, the device can quickly retract the released stent 100, adjust the position, and release it again to continue the next operation, effectively improving the success of the operation Rate.

The device is used for the release and withdrawal of the stent graft 100, especially for the release and withdrawal of the stent graft 100 for TIPS operation.

The retraction method of the device can be a pulling type or a twisting and twisting method. That is, the release and tension of the inner layer suture 300 and the outer layer suture 200 can be pulled or twisted.

Referring to FIG. 3 and FIG. 4 , in this embodiment, the outer suture 200 is sewn on the stent 100 along the length direction of the stent 100 ; During the release and deployment of the stent 100 , the tension of the stent 100 acts on the outer sutures 200 , so that the outer sutures 200 are sequentially broken, and the release of the stent 100 is completed.

Referring to FIG. 3 , in this embodiment, the outer suture 200 is sutured in a rice bag style. Referring to FIG. 4 , in other embodiments, the stitching method shown in FIG. 4 is adopted. As long as the bracket 100 can be fully compressed.

In this embodiment, the material of the outer suture 200 is polypropylene or polyester; the thickness of the outer suture 200 ranges from 0.5-1.5 mm. It should be noted that the material of the outer suture 200 of the device includes, but is not limited to, high molecular polymers such as polypropylene and polyester.

Referring to FIG. 2 , in this embodiment, the stent 100 includes a first row of pores 110 and a second row of pores 110 that are oppositely positioned along the length direction of the stent 100 ; And a second row of holes 110 to compress the stent 100 under tension.

By compressing the stent 100 along opposite sides of the stent 100 , the diameter of the stent 100 can be quickly smaller than that of the blood vessel, so that the stent 100 can be moved quickly until the position of the stent 100 is adjusted correctly. The method of using the first row of holes 110 and the second row of holes 110 is effective and easy to operate.

Referring to FIG. 2 , in this embodiment, the stent 100 includes a first end 111 and a second end 112 opposite to each other; the inner suture 300 includes a first suture section 310 and a second suture section 320 connected to each other; The suture segment 310 crosses through the first row of pores 110 and the second row of pores 110 along the direction from the first end 111 to the second end 112; the second suture segment 320 crosses along the direction from the second end 112 to the first end 111 Through the first row of holes 110 and the second row of holes 110 ; the first suture segment 310 and the second suture segment 320 are intersected.

The inner suture 300 may include a first suture segment 310 , or a second suture segment 320 , or a first suture segment 310 and a second suture segment 320 . Both can compress the stent 100 to separate from the blood vessel in a tensioned state, so as to facilitate the adjustment of the position of the stent 100 .

Referring to FIG. 2 , in this embodiment, the first row of holes 110 includes a plurality of first holes 110 arranged at intervals along the length direction of the stent 100 , and the second row of holes 110 includes a plurality of holes arranged at intervals along the length direction of the stent 100 . The second aperture 110; the plurality of first apertures 110 and the plurality of second apertures 110 are set in one-to-one correspondence.

Referring to FIG. 2 , a plurality of first pores 110 and a plurality of second pores 110 are set in one-to-one correspondence, so that the first suture segment 310 and the second suture segment 320 are wound symmetrically, so that the stent 100 can be uniformly compressed and wound simultaneously. The way is simple, effective and simple.

In this embodiment, the material of the inner suture 300 is polypropylene or polyester, and the thickness of the inner suture 300 is 2-2.5 mm. It should be noted that the material of the inner suture 300 in this device includes, but is not limited to, high molecular polymers such as polypropylene and polyester.

In this embodiment, the inner suture 300 is provided with a retraction portion 410 and a release portion 420 , the retraction portion 410 is used to tighten the inner suture 300 , and the release portion 420 is used to operate the inner suture 300 to release.

The retraction part 410 and the release part 420 can be regarded as two marking points, which are used to locate the position where the inner layer suture 300 is pulled twice, so as to realize the retraction and release function of the stent 100 . Specifically, when the retraction part 410 is pulled, the inner suture 300 is tightened, and the compression stent 100 is tightened through the inner suture 300 . Pulling the release part 420 will break the inner suture 300 , and the stent 100 will be released without the restraint of the inner suture 300 .

According to a TIPS stent release retraction structure 10 provided in this embodiment, the working principle of the TIPS stent release retraction structure 10 is: the outer suture 200 is wound and sutured on the outside of the stent 100, and the inner suture 300 is entangled with each other. The coils are wound and sewn on the inner surface of the stent 100 . The inner layer suture 300 is coated with two marking points, which are the first and second release indicating positions respectively. The outer suture 200 is sutured on the outer surface of the stent 100. When the outer suture 200 is released, the stent 100 expands due to the self-expanding property of the material. At this time, the state of the stent 100 is shown in FIG. 2 . The specific suture method of the outer suture 200 is as shown in FIG. 3 or FIG. 4 . When the force is applied, the outer sutures 200 are broken continuously, and the stent 100 is gradually released. The inner suture 300 is composed of intertwined coils, and is sutured on the inner surface of the stent 100. When the outer suture is released, the inner suture is in a relaxed mesh state as shown in Figure 2. If the stent 100 is released during the operation An adjustment is required, at which point the stent 100 can be withdrawn again through the inner suture 300 . The inner layer suture 300 is tightened for the first time, and the stent 100 in the released state can be compressed to the original unreleased state according to the number of tightened turns or the position of the retracted part 410 , as shown in FIG. 2 . If the position of the stent 100 is adjusted correctly at this time, the inner suture 300 is tightened for the second time. According to the number of tightened turns or the position of the release part 420, the inner suture 300 is disconnected at this time, and the stent 100 is released again.

A TIPS stent release retraction structure 10 provided in this embodiment has at least the following advantages:

If the release position of the stent 100 is incorrect or does not achieve the desired effect of the operation, the device can quickly retract the released stent 100, adjust the position, and release it again to continue the next operation, effectively improving the success rate of the operation.

The embodiment of the present invention also provides a method for releasing and withdrawing the TIPS stent. Implemented by using the TIPS stent release and withdrawal structure 10, the TIPS stent release and withdrawal method includes the following steps: step S1, transporting the stent 100 to the lesion site; step S2, releasing the outer suture 200, so that the stent 100 is released; step S3, If the release position of the stent 100 deviates from the lesion position, the inner suture 300 is tightened to compress the stent 100 to the initial state and then move, and the inner suture 300 is released after moving in place to release the stent 100 . Improve the problem that the stent 100 cannot be retracted after it is released.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. All should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (10)

1. A TIPS stent release retrieval structure, comprising:

a stent (100), an outer layer suture (200) and an inner layer suture (300);

the outer layer suture (200) is wound and connected at the outer part of the stent (100) so as to compress the stent (100) to an initial state; the outer layer suture (200) is used for releasing the stent (100) from the initial state to a spreading state under a releasing state;

the inner layer suture (300) is wound through the pores (110) on the stent (100), the inner layer suture (300) is used for synchronously loosening during the releasing process of the stent (100), or the inner layer suture (300) is used for compressing the stent (100) from the expanding state to the initial state under the condition of tensioning, or the inner layer suture (300) is used for releasing the stent (100) from the initial state to the expanding state under the condition of releasing.

2. The TIPS stent release retrieval structure of claim 1, wherein:

the outer layer suture (200) is sewed on the bracket (100) along the length direction of the bracket (100); the outer layer suture (200) is used for being broken in sequence under the tension of the bracket (100).

3. A TIPS stent release retraction structure according to claim 2, wherein:

the outer layer suture (200) adopts a rice bag type suture mode.

4. The TIPS stent release retrieval structure of claim 3, wherein:

the outer layer suture (200) is made of polypropylene or terylene; the thickness range of the outer layer suture (200) is 0.5-1.5mm.

5. A TIPS stent release retraction structure according to any of claims 1-4, wherein:

the bracket (100) comprises a first row of pores (110) and a second row of pores (110) which are opposite in position and arranged along the length direction of the bracket (100); the inner layer suture (300) is adapted to cross through the first row of apertures (110) and the second row of apertures (110) to compress the stent (100) under tension.

6. A TIPS stent release retraction structure according to claim 5, wherein:

the bracket (100) comprises a first end (111) and a second end (112) which are opposite in position;

the inner layer suture (300) comprises a first suture section (310) and a second suture section (320) which are connected with each other; the first suture segment (310) crosses through the first row of apertures (110) and the second row of apertures (110) in a direction from the first end (111) to the second end (112); the second suture segment (320) crossing the first row of apertures (110) and the second row of apertures (110) in a direction from the second end (112) to the first end (111); the first suture section (310) is arranged to intersect the second suture section (320).

7. A TIPS stent release retraction structure according to claim 6, wherein:

the first row of pores (110) comprises a plurality of first pores (110) which are sequentially arranged at intervals along the length direction of the support (100), and the second row of pores (110) comprises a plurality of second pores (110) which are sequentially arranged at intervals along the length direction of the support (100); the plurality of first apertures (110) and the plurality of second apertures (110) are arranged in a one-to-one correspondence.

8. The TIPS stent release retrieval structure of claim 7, wherein:

the inner layer suture (300) is made of polypropylene or terylene, and the thickness of the inner layer suture (300) is 2-2.5mm.

9. A TIPS stent release retraction structure according to any of claims 1-4, wherein:

the inner layer suture (300) is provided with a withdrawing part (410) and a releasing part (420), wherein the withdrawing part (410) is used for operating and tensioning the inner layer suture (300), and the releasing part (420) is used for operating and releasing the inner layer suture (300).

10. A TIPS stent release retrieval method implemented using the TIPS stent release retrieval structure of any one of claims 1 to 9, wherein the TIPS stent release retrieval method comprises the steps of:

delivering the stent (100) to a lesion site;

releasing the outer layer suture (200) to release the stent (100);

if the release position of the stent (100) deviates from the lesion position, the inner layer suture (300) is tensioned to compress the stent (100) to the initial state and then moved, and the inner layer suture (300) is released after moving to the position, so that the stent (100) is released.

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