Spleen artery blood flow limiting support

Abstract

The utility model discloses a splenic artery blood flow limiting support, and particularly relates to the technical field of medical instruments, the splenic artery blood flow limiting support comprises a supporting support and a flow limiting support, the supporting support is sleeved outside the flow limiting support, two ends of the flow limiting support are fixedly connected with the inner side wall of the supporting support, the flow limiting support is a covered stent, and 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 stent flows in from the contraction section and flows out from the expansion section. The splenic artery embolism postoperative spleen blood perfusion can be reduced, and the recurrence of splenic hyperfunction is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical instrument technical field, in particular to a kind of splenic artery blood flow restriction stents. BACKGROUND

[0002] Splenomegaly is the serious complication of cirrhosis, due to portal hypertension, splenic pathological hypertrophy, leading to splenomegaly, cause platelet, leukocyte decline. At present, the treatment means for splenomegaly is mainly partial splenic embolization. Intervention means is used, embolic agent is injected into spleen, so that partial spleen ischemic necrosis, so as to achieve the purpose of relieving splenomegaly. But after partial splenic embolization treatment, spleen still has sufficient blood perfusion, leading to postoperative remaining spleen tissue regeneration, continue to destroy platelet and leukocyte, so as to make splenomegaly recurrence. SUMMARY

[0003] The utility model aims at providing a kind of splenic artery blood flow restriction stents, to solve the problems existing in the prior art above, can reduce partial splenic embolization postoperative spleen blood perfusion, reduce the recurrence of splenomegaly.

[0004] To achieve the above object, the utility model provides the following scheme:

[0005] The utility model provides a kind of splenic artery blood flow restriction stents, including support stent and flow restriction stent, the support stent is set in the flow restriction stent outer, and the both ends of the flow restriction stent are fixedly connected with the inside wall of the support stent, the flow restriction stent is covered membrane stent, the flow restriction stent includes contraction section and expansion section, the contraction section is fixedly connected with the expansion section and is communicated, and the splenic artery blood flow in the support stent flows from the contraction section, and flows from the expansion section.

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

[0007] Preferably, the shape of the contraction section is conical, and the axis of the contraction section coincides with the axis of the support stent.

[0008] Preferably, the shape of the expansion section is conical, and the axis of the expansion section coincides with the axis of the support stent.

[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 stent is 1 / 10-2 / 3.

[0010] Preferably, 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°.

[0011] Preferably, the support stent is a covered stent.

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

[0013] The utility model discloses relative to prior art has obtained following technical effect:

[0014] The utility model provides a kind of splenic artery blood flow restriction stent, support stent is supported and positioned in splenic artery, and the flow of blood in support stent is controlled by flow restriction stent fixed in support stent.The flow restriction stent includes contraction section and expansion section, and the splenic artery blood flow in support stent flows from contraction section, and flows from expansion section, and contraction section reduces the flow area of blood flow, both maintain certain splenic artery perfusion, also reduce the flow of splenic artery blood flow, to reduce the possibility of spleen rupture after splenic artery embolization;Blood flow is accelerated after decompression by contraction part, and expansion part helps to make blood flow restore to relatively stable flow state, reduce the degree of blood flow disorder, let blood flow more smoothly out of support stent. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the following will briefly introduce the drawings needed to be used in the embodiments, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0016] Fig. 1 It is the structure schematic view of splenic artery blood flow restriction stent;

[0017] Fig. 2 It is the blood flow schematic view in splenic artery blood flow restriction stent.

[0018] In the drawing: 1-support stent;2-flow restriction stent;3-contraction section;4-expansion section. DETAILED DESCRIPTION

[0019] The technical scheme in the embodiments of the utility model will be clearly and completely described in the following by combining with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments.Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0020] The utility model discloses a kind of splenic artery blood flow restriction stent, to solve the problems existing in the prior art described above, can reduce part of spleen blood flow perfusion after splenic artery embolization, reduce the recurrence of hyperfunction of spleen.

[0021] 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 implementation methods.

[0022] Example 1

[0023] This embodiment provides a splenic artery blood flow limiting stent, such as Figs. 1-2 As shown, the device comprises a support stent 1 and a flow-limiting stent 2. The support stent 1 is sleeved over the flow-limiting stent 2, and both ends of the flow-limiting stent 2 are fixedly connected to the inner sidewall of the support stent 1. The flow-limiting stent 2 is a covered stent and comprises a contraction section 3 and an expansion section 4. The contraction section 3 and the expansion section 4 are fixedly connected and communicated. The splenic artery blood flow in the support stent 1 flows in from the contraction section 3 and out from the expansion section 4. The support stent 1 provides support and positioning within the splenic artery, and the flow-limiting stent 2 fixed within the support stent 1 is used to control the flow of blood within 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 into the contraction section 3 and flows out of 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 surgery; after the blood flow accelerates and reduces the pressure through the contraction section, 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.

[0024] 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 convenient for manufacturing and has better firmness.

[0025] 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, the axis of the expansion section 4 coincides with the axis of the support bracket 1.

[0026] In the implementation of this embodiment, it is further preferred that the small end face of the expansion section 4 and the small end face of the contraction section 3 have the same area, 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, 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 / 3-2 / 3, which not only maintains a certain level of splenic artery perfusion but also reduces the possibility of spleen rupture after splenic artery embolization. The large angle between the generatrix of the expansion section 4 and its axis allows blood flow to form vortices in the expansion section 4, reducing the chance of arterial thrombosis and the chance of stent blockage.

[0027] Further preferably in the implementation of the embodiment, the support stent 1 is a covered stent or a bare metal stent, and the support stent 1 mainly plays a positioning and supporting role in the splenic artery, and the covered stent or the bare metal stent can be selected according to actual needs.

[0028] Embodiment 2

[0029] The embodiment provides a use method of the splenic artery blood flow restriction stent of embodiment 1, and the use method comprises the following steps:

[0030] Step one, place the balloon inside the front end of the splenic artery blood flow restriction stent, and then place the balloon and the splenic artery blood flow restriction stent into the splenic artery trunk close to the hilum of the spleen through DSA positioning;

[0031] Step two, open the support stent 1, the contraction section 3 and the expansion section 4 of the flow restriction stent 2 by inflating the balloon, so that the support stent is attached to the splenic artery for support, and the balloon is deflated after completion.

[0032] Among them, a common balloon can be used, the balloon is inflated first to open the end of the support stent 1 away from the spleen and the contraction section 3 of the flow restriction stent 2, so that the end of the support stent 1 away from the spleen is attached to the splenic artery for support, then the balloon is deflated, the balloon is passed into the expansion section 4 of the flow restriction stent 2 from the small end face of the contraction section 3, then the balloon is inflated again to open the expansion section 4 of the flow restriction stent 2 and the end of the support stent 1 close to the spleen, so that the end of the support stent 1 close to the spleen is attached to the splenic artery for support, and the balloon is deflated after completion. A double balloon can also be used, that is, the front end balloon and the rear end balloon are connected together, and the front end balloon and the rear end balloon are respectively controlled by two different air guide holes, the connection part of the double balloon is placed at the connection part of the contraction section 3 and the expansion section 4, the position of the balloon does not need to be moved, and the contraction section 3 and the expansion section 4 can be opened respectively by inflating the different balloons, and then the support stent 1 is opened.

[0033] The principle and implementation mode of the specific examples are described in the utility model, and the above embodiment is only used to help understand the method and core idea of the utility model; meanwhile, according to the idea of the utility model, the specific implementation mode and application range will be changed by the general technical personnel in the field. In conclusion, the content of the specification should not be understood as the limitation of the utility model.

Claims

1. A splenic artery blood flow restriction stent, characterized by: The support stent is sleeved outside the flow-limiting stent, and two ends of the flow-limiting stent are fixedly connected with inner side walls of the support stent, the flow-limiting stent is a covered stent, the flow-limiting stent comprises a contraction section and an expansion section, the contraction section is fixedly connected with and communicated with the expansion section, and the splenic artery blood flow in the support stent flows into the contraction section and flows out of the expansion section.

2. The splenic artery blood flow restriction stent of claim 1, wherein: The contraction section and the expansion section are integrally formed.

3. The splenic artery blood flow restriction stent of claim 1, wherein: The shape of the contraction section is conical, and the axis of the contraction section coincides with the axis of the support stent.

4. The splenic artery blood flow restriction stent of claim 3, wherein: The shape of the expansion section is conical, and the axis of the expansion section coincides with the axis of the support stent.

5. The splenic artery blood flow restriction stent of claim 4, wherein: The small end surface area of the expansion section is the same as the small end surface area of the contraction section, and the ratio of the small end surface area of the contraction section to the cross-sectional area of the support stent is 1 / 10-2 / 3.

6. The splenic artery blood flow restriction stent of claim 5, wherein: The included angle between the generatrix of the contraction section and the axis of the contraction section is 0-30 degrees, and the included angle between the generatrix of the expansion section and the axis of the expansion section is 45-60 degrees.

7. The splenic artery blood flow restriction stent of claim 1, wherein: The support stent is a covered stent.

8. The splenic artery blood flow restriction stent of claim 1, wherein: The support stent is a metal bare stent.

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