Spleen artery blood flow limiting support and using method

Abstract

The invention discloses a spleen artery blood flow limiting stent and a using method, and particularly relates to the technical field of medical instruments.The spleen artery blood flow limiting stent comprises a supporting stent and a flow limiting stent, the supporting stent is arranged outside the flow limiting stent in a sleeving mode, the two ends of the flow limiting stent are fixedly connected with the inner side wall of the supporting stent, and the flow limiting stent is a covered stent; the flow limiting support comprises a contraction section and an expansion section, the contraction section and the expansion section are fixedly connected and communicated, and splenic artery blood flow in the supporting support flows in from the contraction section and flows out from the expansion section. According to the invention, spleen blood perfusion after partial spleen artery embolism operation can be reduced, and recurrence of splenic hyperfunction is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a splenic artery blood flow limiting stent and a use method thereof. Background Art

[0002] Hypersplenism is a serious complication of liver cirrhosis. Due to portal hypertension, the spleen is pathologically enlarged, leading to hypersplenism and a decrease in platelets and leukocytes. The current treatment for hypersplenism is mainly partial splenic artery embolization. Using interventional means, embolic agents are injected into the spleen to cause ischemia and necrosis of part of the spleen, thereby achieving the purpose of alleviating hypersplenism. However, after partial splenic artery embolization, the spleen still has sufficient blood perfusion, resulting in the regeneration of the remaining spleen tissue after surgery, which continues to destroy platelets and leukocytes, causing recurrence of hypersplenism. Summary of the invention

[0003] The purpose of the present invention is to provide a splenic artery blood flow limiting stent and a method of use to solve the problems existing in the above-mentioned prior art, which can reduce the spleen blood perfusion after partial splenic artery embolization and reduce the recurrence of hypersplenism.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides a splenic artery blood flow limiting stent, comprising a supporting stent and a flow limiting stent, wherein the supporting stent is sleeved outside the flow limiting stent, and the two ends of the flow limiting stent are fixedly connected to the inner wall of the supporting stent, the flow limiting stent is a coated stent, and the flow limiting stent comprises a contraction section and an expansion section, the contraction section is fixedly connected and communicated with the expansion section, and the splenic artery blood flow in the supporting stent flows into the contraction section and flows out of the expansion section.

[0006] Preferably, the contraction section and the expansion section are integrally formed.

[0007] Preferably, the contraction section is conical in shape, and the axis of the contraction section coincides with the axis of the supporting bracket.

[0008] Preferably, the expansion section is conical in shape, and the axis of the expansion section coincides with the axis of the supporting bracket.

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

[0010] Preferably, 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] Preferably, the supporting stent is a coated stent.

[0012] Preferably, the supporting stent is a bare metal stent.

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

[0014] Step 1, placing an airbag inside the front end of the splenic artery blood flow limiting stent, and then positioning the airbag and the splenic artery blood flow limiting stent into the main trunk of the splenic artery near the splenic hilum through DSA;

[0015] Step 2, by inflating the airbag, opening the contraction section and expansion section of the support stent and the flow-limiting stent, so that the support stent fits the splenic artery and supports it. After completion, the airbag is deflated and removed.

[0016] Compared with the prior art, the present invention has achieved the following technical effects:

[0017] The present invention provides a splenic artery blood flow limiting stent and a method of use. The support stent plays a supporting and positioning role in the splenic artery, and the flow limiting stent fixed in the support stent is used to control the flow of blood flow in the support stent. The flow limiting stent includes a contraction section and an expansion section. The splenic artery blood flow in the support stent flows in from the contraction section and flows out from the expansion section. The contraction section reduces the circulation area of ​​the blood flow, which not only maintains a certain splenic artery perfusion, but also reduces the flow of splenic artery blood flow, thereby reducing the possibility of spleen rupture after splenic artery embolization. After the blood flow passes through the contraction section to accelerate the decompression, the expansion section helps to restore the blood flow to a relatively stable flow state, reduce the degree of blood flow disorder, and allow the blood flow to flow out of the support stent more smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a schematic diagram of the structure of a splenic artery blood flow limiting stent;

[0020] Figure 2 Schematic diagram of blood flow in the splenic artery blood flow restriction stent.

[0021] In the figure: 1-support bracket; 2-current limiting bracket; 3-contraction section; 4-expansion section. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] The purpose of the present invention is to provide a splenic artery blood flow limiting stent and a method of use to solve the problems existing in the above-mentioned prior art, which can reduce the spleen blood perfusion after partial splenic artery embolization and reduce the recurrence of hypersplenism.

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Example 1

[0026] This embodiment provides a splenic artery blood flow limiting stent, such as Figure 1-2 As shown, it includes a support stent 1 and a flow-limiting stent 2. The support stent 1 is sleeved outside the flow-limiting stent 2, and the two ends of the flow-limiting stent 2 are fixedly connected to the inner wall of the support stent 1. The flow-limiting stent 2 is a coated stent. The flow-limiting stent 2 includes a contraction section 3 and an expansion section 4. The contraction section 3 is fixedly connected and communicated with the expansion section 4. The splenic artery blood flow in the support stent 1 flows in from the contraction section 3 and flows out from the expansion section 4. The support stent 1 plays a supporting and positioning role in the splenic artery, and the flow-limiting stent 2 fixed in the support stent 1 is used to control the flow of blood flow in the support stent 1. The flow-limiting stent 2 includes a contraction section 3 and an expansion section 4. The splenic artery blood flow in the support stent 1 flows in from the contraction section 3 and flows out from the expansion section 4. The contraction section 3 reduces the circulation area of ​​the blood flow, which not only maintains a certain splenic artery perfusion, but also reduces the flow rate of splenic artery blood flow, thereby reducing the possibility of spleen rupture after splenic artery embolization. After the blood flow passes through the contraction section to accelerate the reduction in pressure, the expansion section helps to restore the blood flow to a relatively stable flow state, reduce the degree of blood flow disorder, and allow the blood flow to flow out of the support stent 1 more smoothly and into the spleen.

[0027] It is further preferred in the implementation manner of this embodiment that the contraction section 3 and the expansion section 4 are integrally formed, which is easy to manufacture and has better firmness.

[0028] It is further preferred in the implementation of this embodiment that the shape of the contraction section 3 is conical, the axis of the contraction section 3 coincides with the axis of the support bracket 1, and the shape of the expansion section 4 is conical, and the axis of the expansion section 4 coincides with the axis of the support bracket 1.

[0029] It is further preferred in the implementation of this embodiment that the small end face of the expansion section 4 is the same as the small end face area of ​​the contraction section 3, the ratio of the small end face area of ​​the contraction section 3 to the cross-sectional area of ​​the support stent 1 is 1 / 3-2 / 3, 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°. The ratio of the small end face area of ​​the contraction section 3 to the cross-sectional area of ​​the support stent 1 is 1 / 10-2 / 3, which not only maintains a certain splenic artery perfusion, but also reduces the possibility of spleen rupture after splenic artery embolization; the angle between the generatrix of the expansion section 4 and its axis is large, and the blood flow can form a vortex in the expansion section 4, which reduces the probability of arterial thrombosis and the chance of stent blockage.

[0030] It is further preferred in the implementation manner of this embodiment that the support stent 1 is a coated stent or a bare metal stent. The support stent 1 mainly plays a positioning and supporting role in the splenic artery. The coated stent or the 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 limiting stent of Embodiment 1, comprising the following steps:

[0033] Step 1: Place the balloon inside the front end of the splenic artery blood flow limiting stent, and then position the balloon and the splenic artery blood flow limiting stent into the main trunk of the splenic artery near the splenic hilum through DSA;

[0034] Step 2, by inflating the airbag, the contraction section 3 and expansion section 4 of the support stent 1 and the flow-limiting stent 2 are opened, so that the support stent fits the splenic artery and supports it. After completion, the airbag is deflated and removed.

[0035] Among them, an ordinary airbag can be used. By inflating the airbag, first open the end of the support bracket 1 away from the spleen and the contraction section 3 of the flow limiting bracket 2, so that the end of the support bracket 1 away from the spleen is in contact with the splenic artery for support, and then deflate the airbag, pass the airbag through the small end face of the contraction section 3 into the expansion section 4 of the flow limiting bracket 2, and then inflate the airbag again, open the expansion section 4 of the flow limiting bracket 2 and the end of the support bracket 1 close to the spleen, so that the end of the support bracket 1 close to the spleen is in contact with the splenic artery for support, and after completion, deflate the airbag and take it out.

[0036] A double airbag can also be used, that is, the front airbag and the rear airbag are connected together, and the front airbag and the rear airbag are respectively controlled by two different air guide holes. The connection between the double 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 airbag. The contraction section 3 and the expansion section 4 can be opened separately by inflating different airbags, and then the support bracket 1 can be opened.

[0037] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A splenic artery blood flow limiting stent, characterized in that: It includes a supporting bracket and a flow-limiting bracket, wherein the supporting bracket is sleeved outside the flow-limiting bracket, and the two ends of the flow-limiting bracket are fixedly connected to the inner wall of the supporting bracket, the flow-limiting bracket is a coated bracket, and the flow-limiting bracket includes a contraction section and an expansion section, the contraction section is fixedly connected and communicated with the expansion section, and the splenic artery blood flow in the supporting bracket flows into the contraction section and flows out of the expansion section.

2. The splenic artery blood flow limiting stent according to claim 1, characterized in that: The contraction section and the expansion section are integrally formed.

3. The splenic artery blood flow limiting stent according to claim 1, characterized in that: The contraction section is conical in shape, and the axis of the contraction section coincides with the axis of the supporting bracket.

4. The splenic artery blood flow limiting stent according to claim 3, characterized in that: The expansion section is conical in shape, and the axis of the expansion section coincides with the axis of the supporting bracket.

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

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

7. The splenic artery blood flow limiting stent according to claim 1, characterized in that: The supporting stent is a coated stent.

8. The splenic artery blood flow limiting stent according to claim 1, characterized in that: The supporting stent is a bare metal stent.

9. A method for using the splenic artery blood flow limiting stent according to any one of claims 1 to 8, characterized in that: The steps include: Step 1, placing an airbag inside the splenic artery blood flow limiting stent, and then positioning the airbag and the splenic artery blood flow limiting stent into the main trunk of the splenic artery near the splenic hilum through DSA; Step 2, by inflating the airbag, opening the contraction section and expansion section of the support stent and the flow-limiting stent, so that the support stent fits the splenic artery and supports it. After completion, the airbag is deflated and removed.

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