Splenic artery blood flow restriction stent and use method

Abstract

The present invention specifically relates to the technical field of medical devices. Disclosed are a splenic artery blood flow restriction stent and a use method. The splenic artery blood flow restriction stent comprises a support stent (1) and a flow restriction stent (2); the support stent (1) is sleeved outside the flow restriction stent (2); two ends of the flow restriction stent (2) are fixedly connected to the inner side wall of the support stent (1); the flow restriction stent (2) is a covered stent; the flow restriction stent (2) comprises a contraction section (3) and an expansion section (4); the contraction section (3) is fixedly connected to and communicated with the expansion section (4); and splenic artery blood flow in the support stent (1) flows in from the contraction section (3) and flows out from the expansion section (4).

Description

A splenic artery blood flow restriction stent and its usage method Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a splenic artery blood flow restriction stent and its method of use. Background Technology

[0002] Hypersplenism is a serious complication of cirrhosis. Due to portal hypertension, the spleen becomes pathologically enlarged, leading to hypersplenism and a decrease in platelets and white blood cells. In some cases, the main treatment for hypersplenism is partial splenic artery embolization. This interventional procedure involves injecting an embolic agent into the spleen, causing partial ischemia and necrosis, thereby alleviating hypersplenism. However, even after partial splenic artery embolization, the spleen still receives sufficient blood perfusion, leading to regeneration of the remaining splenic tissue, which continues to destroy platelets and white blood cells, resulting in a recurrence of hypersplenism. Summary of the Invention

[0003] The purpose of this invention is to provide a splenic artery blood flow restriction stent and its usage method to solve the problems existing in the prior art, thereby reducing splenic blood flow perfusion after partial splenic artery embolization and reducing the recurrence of hypersplenism.

[0004] To achieve the above objectives, the present invention provides the following solution:

[0005] This invention provides a splenic artery blood flow restricting stent, comprising a supporting stent and a flow restricting stent. The supporting stent is sleeved outside the flow restricting stent, and both ends of the flow restricting stent are fixedly connected to the inner sidewall of the supporting stent. The flow restricting stent is a covered stent, and the flow restricting stent includes a constricting segment and a dilating segment. The constricting segment and the dilating segment are fixedly connected and communicate with each other. Splenic artery blood flow in the supporting stent flows in from the constricting segment and flows out from the dilating segment.

[0006] In one embodiment, the contraction section and the expansion section are integrally formed.

[0007] In one embodiment, the contraction section is tapered, and the axis of the contraction section coincides with the axis of the support bracket.

[0008] In one embodiment, the expansion section is tapered, and the axis of the expansion section coincides with the axis of the support bracket.

[0009] In one embodiment, the small end face of the expansion section and the small end face of the contraction section have the same area, and the ratio of the small end face area of ​​the contraction section to the cross-sectional area of ​​the support bracket is 1 / 10-2 / 3.

[0010] In one embodiment, the angle between the generatrix of the contraction section and its axis is 0-30°, and the angle between the generatrix of the expansion section and its axis is 45-60°.

[0011] In one embodiment, the support bracket is a film-coated bracket.

[0012] In one embodiment, the support bracket is a bare metal bracket.

[0013] The present invention also provides a method for using the splenic artery blood flow restricting stent, comprising the following steps:

[0014] Step 1: Place the balloon inside the front end of the splenic artery blood flow restriction stent, and then insert the balloon and the splenic artery blood flow restriction stent into the splenic artery trunk near the splenic hilum using DSA to determine their positions.

[0015] Step two: Inflate the airbag to open the constriction and expansion sections of the support stent and the flow-limiting stent, so that the support stent fits and supports the splenic artery. After completion, deflate the airbag and remove it.

[0016] The present invention achieves the following technical effects compared to the prior art:

[0017] This invention provides a splenic artery blood flow limiting stent and its usage method. The stent provides support and positioning within the splenic artery, while the flow-limiting stent, fixed within the stent, controls the blood flow within the stent. The flow-limiting stent includes a systolic segment and a dilatation segment. Splenic artery blood flows into the systolic segment and out through the dilatation segment. The systolic segment reduces the flow area, maintaining a certain level of splenic artery perfusion while reducing the blood flow, thus lowering the likelihood of splenic rupture after splenic artery embolization. After the blood flow is accelerated and depressurized by the systolic segment, the dilatation segment helps restore the blood flow to a relatively stable state, reducing turbulence and allowing the blood to flow out of the stent more smoothly. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 is a schematic diagram of the splenic artery blood flow restriction stent provided in one or more embodiments of the present invention;

[0020] Figure 2 is a schematic diagram of blood flow within a splenic artery blood flow restriction stent provided in one or more embodiments of the present invention.

[0021] In the diagram: 1-Support bracket; 2-Flow limiting bracket; 3-Contraction section; 4-Expansion section. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and 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.

[0023] The purpose of this invention is to provide a splenic artery blood flow restriction stent and its usage method to solve the problems existing in the prior art, thereby reducing splenic blood flow perfusion after partial splenic artery embolization and reducing the recurrence of hypersplenism.

[0024] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Example 1

[0026] As shown in Figures 1 and 2, this embodiment provides a splenic artery blood flow restricting stent, including a supporting stent 1 and a flow-restricting stent 2. The supporting stent 1 is sleeved on the flow-restricting stent 2, and both ends of the flow-restricting stent 2 are fixedly connected to the inner sidewall of the supporting stent 1. The flow-restricting stent 2 is a covered stent, which includes a constrictive segment 3 and a dilatation segment 4. The constrictive segment 3 and the dilatation segment 4 are fixedly connected and communicate with each other. Splenic artery blood flow in the supporting stent 1 flows into the constrictive segment 3 and flows out through the dilatation segment 4. The supporting stent 1 provides support and positioning within the splenic artery, and the flow-restricting stent 2, fixed within the supporting stent 1, controls the blood flow rate within the supporting stent 1. The flow-limiting stent 2 includes a systolic segment 3 and a dilatation segment 4. Splenic artery blood flow within the stent 1 flows in through the systolic segment 3 and out through the dilatation segment 4. The systolic segment 3 reduces the flow area of ​​blood flow, which maintains a certain level of splenic artery perfusion while reducing the amount of blood flow in the splenic artery, thereby reducing the possibility of splenic rupture after splenic artery embolization. After the blood flow passes through the systolic segment and the blood pressure is reduced, the dilatation segment helps to restore the blood flow to a relatively stable state, reducing the degree of blood flow turbulence and allowing the blood to flow more smoothly out of the stent 1 and into the spleen.

[0027] The splenic artery blood flow restriction stent provided in this embodiment has its constriction segment 3 and dilation segment 4 integrally molded, which is easy to manufacture and has better stability.

[0028] The splenic artery blood flow restricting stent provided in this embodiment has a constriction segment 3 that is tapered in shape, with the axis of the constriction segment 3 coinciding with the axis of the supporting stent 1, and an expansion segment 4 that is tapered in shape, with the axis of the expansion segment 4 coinciding with the axis of the supporting stent 1.

[0029] The splenic artery blood flow restricting stent provided in this embodiment has the same small end face area for the dilation segment 4 and the constriction segment 3. The ratio of the small end face area of ​​the constriction segment 3 to the cross-sectional area of ​​the supporting stent 1 is 1 / 3-2 / 3. The angle between the generatrix of the constriction segment 3 and its axis is 0-30°, while the angle between the generatrix of the dilation segment 4 and its axis is 45-60°. The ratio of the small end face area of ​​the constriction segment 3 to the cross-sectional area of ​​the supporting stent 1 is 1 / 10-2 / 3, which maintains a certain level of splenic artery perfusion and reduces the possibility of splenic rupture after splenic artery embolization. The larger angle between the generatrix of the dilation segment 4 and its axis allows blood flow to form eddies in the dilation segment 4, reducing the probability of arterial thrombosis and the chance of stent occlusion.

[0030] The splenic artery blood flow restriction stent provided in this embodiment is a covered stent or a bare metal stent. The supporting stent 1 mainly plays a positioning and support role in the splenic artery. A covered stent or a bare metal stent can be selected according to actual needs.

[0031] Example 2

[0032] This embodiment provides a method for using the splenic artery blood flow restriction stent of Embodiment 1, including the following steps:

[0033] Step 1: Place the balloon inside the front end of the splenic artery blood flow restriction stent, and then insert the balloon and the splenic artery blood flow restriction stent into the splenic artery trunk near the splenic hilum under DSA positioning.

[0034] Step 2: Inflate the balloon to open the constriction section 3 and expansion section 4 of the support stent 1 and the flow-limiting stent 2, so that the support stent can fit and support the splenic artery. After completion, deflate the balloon and remove it.

[0035] One approach is to use a standard balloon. By inflating the balloon, the end of the stent 1 furthest from the spleen and the constriction section 3 of the flow-limiting stent 2 are opened, allowing the end of the stent 1 furthest from the spleen to be attached to and supported by the splenic artery. Then, the balloon is deflated, and the balloon is passed through the small end face of the constriction section 3 into the expansion section 4 of the flow-limiting stent 2. The balloon is then inflated again, opening the expansion section 4 of the flow-limiting stent 2 and the end of the stent 1 closest to the spleen, allowing the end of the stent 1 closest to the spleen to be attached to and supported by the splenic artery. After completion, the balloon is deflated and removed.

[0036] Alternatively, a dual-airbag configuration can be used, where the front airbag and the rear airbag are connected together, and the front airbag and the rear airbag are controlled by two different air vents. The connection point of the dual airbags is located at the connection between the contraction section 3 and the expansion section 4. There is no need to move the position of the airbags. Simply inflating the different airbags will open the contraction section 3 and the expansion section 4 respectively, thereby opening the support bracket 1.

[0037] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A splenic artery blood flow restricting stent, characterized in that, include: The stent (1) and the flow-limiting stent (2) are provided. The stent (1) is sleeved on the outside of the flow-limiting stent (2), and the two ends of the flow-limiting stent (2) are fixedly connected to the inner sidewall of the stent (1). The flow-limiting stent (2) is a covered stent. The flow-limiting stent (2) includes a constriction section (3) and an expansion section (4). The constriction section (3) and the expansion section (4) are fixedly connected and communicate with each other. The splenic artery blood flow in the stent (1) flows in from the constriction section (3) and flows out from the expansion section (4).

2. The splenic artery blood flow restricting stent according to claim 1, characterized in that, The contraction section (3) and the expansion section (4) are integrally formed.

3. The splenic artery blood flow restricting stent according to claim 1, characterized in that, The contraction section (3) is tapered, and the axis of the contraction section (3) coincides with the axis of the support bracket (1).

4. The splenic artery blood flow restricting stent according to claim 3, characterized in that, The expansion section (4) is tapered, and the axis of the expansion section (4) coincides with the axis of the support bracket (1).

5. The splenic artery blood flow restricting stent according to claim 4, characterized in that, The small end face of the expansion section (4) and the small end face of the contraction section (3) have the same area, and the ratio of the small end face area of ​​the contraction section (3) to the cross-sectional area of ​​the support bracket (1) is 1 / 10-2 / 3.

6. The splenic artery blood flow restricting stent according to claim 5, characterized in that, The angle between the generatrix of the contraction section (3) and its axis is 0-30°, and the angle between the generatrix of the expansion section (4) and its axis is 45-60°.

7. The splenic artery blood flow restricting stent according to claim 1, characterized in that, The support bracket (1) is a film-coated bracket.

8. The splenic artery blood flow restricting stent according to claim 1, characterized in that, The support bracket (1) is a bare metal bracket.

9. A method of using the splenic artery blood flow restricting stent according to any one of claims 1-8, characterized in that, Includes the following steps: Step 1: Place the balloon inside the splenic artery blood flow restriction stent, and then position the balloon and the splenic artery blood flow restriction stent into the main trunk of the splenic artery near the splenic hilum using DSA. Step 2: Inflate the airbag to open the constriction section (3) and expansion section (4) of the support stent (1) and the flow-limiting stent (2), so that the support stent (1) fits and supports the splenic artery. After completion, deflate the airbag and remove it.

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