Iliac vein stent

Abstract

The utility model provides an iliac vein stent, which belongs to the technical field of medical instruments and comprises an inferior vena cava stent and a general iliac vein stent. The iliac general vein stent is connected with the inferior vena cava stent through a first connecting piece; the first connecting piece is a degradable connecting piece, and the inferior vena cava stent is allowed to be removed after the degradable connecting piece is degraded. The inferior vena cava stent has the advantages that the inferior vena cava compression problem can be solved by adding the inferior vena cava stent, the problem that in the prior art, an iliac vein stent cannot interfere with inferior vena cava compression is solved, and meanwhile the problem that thrombus is formed due to the fact that the iliac vein stent enters the inferior vena cava for better anchoring is avoided; meanwhile, the iliac general vein stent and the inferior vena cava stent are connected through the degradable connecting piece, the inferior vena cava stent can be removed after the degradable connecting piece is degraded, and interference of the inferior vena cava stent on the vascular structure is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to an iliac vein stent. Background Art

[0002] Iliac vein compression syndrome (IVCS) is a vascular disease caused by anatomical abnormalities. The main cause is the continuous mechanical compression of the left common iliac vein by the right common iliac artery and the fifth lumbar vertebra. This compression and arterial pulsation can cause the venous intima to be stimulated and proliferate and fibrose, which in turn causes a series of clinical symptoms such as venous reflux obstruction, venous hypertension, and chronic venous insufficiency of the lower limbs.

[0003] Iliac vein stents are an effective treatment method widely used in the treatment of iliac vein compression syndrome. However, in actual applications, in order to ensure the stable anchoring of the stent, the proximal part of the stent is often placed 1-5 cm into the inferior vena cava. Although this operation enhances the stability of the stent to a certain extent, once the stent is displaced, it is easy to cause restenosis of the blood vessel, thereby aggravating the patient's symptoms; and the part of the stent that exceeds the inferior vena cava will also affect the hemodynamics of the opposite side and increase the risk of thrombosis, especially with the endothelialization of the stent, this hemodynamic impact may be further aggravated.

[0004] In addition, when the compression position involves the junction of the inferior vena cava and the common iliac vein, the existing iliac vein stents often cannot achieve effective expansion effect alone. The existing technology usually requires the placement of an additional inferior vena cava stent to expand the compressed blood vessel segment, which not only increases the complexity and time of the operation, but also increases the financial burden on the patient; and the inferior vena cava stent is usually formed in one piece with the iliac vein stent, which will interfere with the vascular structure of the iliac vein. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides an iliac vein stent.

[0006] The technical problem solved by the present invention can be achieved by adopting the following technical solutions:

[0007] An iliac vein stent, comprising:

[0008] Inferior vena cava stents and common iliac vein stents;

[0009] The common iliac vein stent is connected to the inferior vena cava stent via a first connector;

[0010] The first connector is a degradable connector, and the degradation of the degradable connector allows the inferior vena cava stent to be removed.

[0011] Preferably, the inferior vena cava stent is a cutting type stent or a braided type stent.

[0012] Preferably, the common iliac vein stent comprises a first stent and a second stent;

[0013] One end of the first bracket is connected to the second bracket, and the other end of the first bracket is connected to the inferior vena cava bracket through the first connector.

[0014] Preferably, the first stent is a cutting stent or a braided stent;

[0015] The second stent is a braided stent.

[0016] Preferably, when the first stent is a braided stent, the pitch of the first stent is smaller than the pitch of the second stent.

[0017] Preferably, when the first stent of the inferior vena cava stent or the common iliac vein stent is a cutting type stent;

[0018] The cutting type bracket is formed by integral cutting; or

[0019] The cutting type bracket includes at least two band sub-brackets, and the at least two band sub-brackets are connected by a coating connecting rod.

[0020] Preferably, the radial supporting force of the inferior vena cava stent is greater than the radial supporting force of the first stent;

[0021] The radial supporting force of the first bracket is greater than the radial supporting force of the second bracket.

[0022] Preferably, the first bracket and the second bracket are integrally formed; or

[0023] The first bracket and the second bracket are connected via a second connecting member.

[0024] Preferably, the first connector has an open-loop structure, and the open-loop structure of the first connector passes through the inferior vena cava stent and the common iliac vein stent respectively, and then the open-loop structure is closed.

[0025] The advantages or beneficial effects of the technical solution of the utility model are:

[0026] The utility model can solve the problem of inferior vena cava compression by adding an inferior vena cava stent, solves the problem that the iliac vein stent in the existing technology cannot interfere with the inferior vena cava compression, and also avoids the problem that the iliac vein stent enters the inferior vena cava for better anchoring and causes thrombosis; at the same time, the common iliac vein stent is connected to the inferior vena cava stent by a degradable connector, and the inferior vena cava stent can be removed after the degradable connector is degraded, thereby avoiding the inferior vena cava stent from interfering with the vascular structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic structural diagram of an iliac vein stent in a preferred embodiment 1 of the present utility model;

[0028] Figure 2 This is a schematic structural diagram of a cutting type bracket in a preferred embodiment of the utility model;

[0029] Figure 3 This is a schematic structural diagram of a cutting type bracket in a preferred embodiment of the utility model;

[0030] Figure 4 This is a schematic structural diagram of a stent graft in a preferred embodiment of the utility model;

[0031] Figure 5 This is a schematic structural diagram of an iliac vein stent in a preferred embodiment 2 of the present utility model;

[0032] Figure 6 This is a schematic structural diagram of the iliac vein stent in the preferred embodiment 3 of the present utility model.

[0033] Description of reference numerals:

[0034] 100a, 100b, 100c, iliac vein stent; 10a, 10b, 10c, inferior vena cava stent; 20a, 20b, 20c, common iliac vein stent; 201a, 201b, 201c, first stent; 202a, 202b, 202c, second stent; 30, first connector;

[0035] 40. Cutting type bracket; 41a, 41b. Band sub-bracket; 42. Connecting rod. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0038] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0039] It should be noted that, for the sake of clarity, the present invention uses numbers and letters to distinguish the same components in different embodiments. For example, the iliac vein stent 100a, iliac vein stent 100b, and iliac vein stent 100c are used to distinguish iliac vein stents in different embodiments; similarly, the inferior vena cava stent, the common iliac vein stent, the first stent, and the second stent are also distinguished in a similar manner, which will not be repeated here.

[0040] Example 1

[0041] See also Figure 1 In a preferred embodiment of the present utility model, based on the above problems existing in the prior art, an iliac vein stent 100a is provided, comprising:

[0042] Inferior vena cava stent 10a and common iliac vein stent 20a;

[0043] The common iliac vein stent 20a is connected to the inferior vena cava stent 10a via a first connector 30;

[0044] The first connector 30 is a degradable connector, which allows the inferior vena cava stent 10a to be removed after degradation.

[0045] Specifically, considering that only the common iliac vein stent 20a is provided in the traditional iliac vein stent, the head end of the stent needs to be inserted into the inferior vena cava 1-5 cm for anchoring the stent. If the stent is displaced, it is easy to cause restenosis of the blood vessel. At the same time, exceeding the stent will affect the hemodynamics of the opposite side, thereby stimulating thrombosis. At the same time, when the compression position involves the junction of the inferior vena cava and the common iliac vein, the iliac vein stent alone cannot effectively expand the inferior vena cava. It may be necessary to place an additional inferior vena cava stent 10 to expand the compressed inferior vena cava. The inferior vena cava stent 10a will interfere with the vascular structure of the iliac vein.

[0046] Compared with the traditional iliac vein stent, the utility model adds the design of the inferior vena cava stent 10a to the iliac vein stent 100a, which can directly intervene in the compression of the inferior vena cava, effectively relieve or eliminate the compression of the inferior vena cava, thereby improving the patient's blood circulation and reducing related complications caused by the compression of the inferior vena cava. The inferior vena cava stent 10a is used to prop up the compressed inferior vena cava, avoiding the risk of thrombosis caused by the common iliac vein stent 20a entering the inferior vena cava in the prior art.

[0047] At the same time, the inferior vena cava stent 10a and the common iliac vein stent 20a adopt a split design, and the two are connected by a first connecting piece 30. Through the anchoring of the inferior vena cava stent 10a and the restraining effect of the first connecting piece 30, the position stability of the common iliac vein stent 20a is improved, the risk of displacement of the common iliac vein stent 20a is reduced, and the problem of vascular restenosis caused by stent displacement is further reduced.

[0048] In addition, the first connector 30 is designed to be degradable. When the first connector 30 is degraded, the inferior vena cava stent 10a can be removed, thereby avoiding potential interference with the vascular structure caused by long-term indwelling of the inferior vena cava stent 10a, which is beneficial to the recovery and maintenance of the vascular structure.

[0049] Furthermore, after the first connector 30 is degraded, it can be determined whether to remove the inferior vena cava stent 10a from the body according to the compression condition of the inferior vena cava of the patient.

[0050] If the patient's inferior vena cava compression condition has been significantly improved and there is no risk of recurrence, the inferior vena cava stent 10a may be completely removed.

[0051] If the patient's inferior vena cava is still compressed or there is a risk of recurrence, the inferior vena cava stent 10a can be retained. At this time, although the first connector 30 has been degraded, the inferior vena cava stent 10a can still support the blood vessel by relying on its own radial support force.

[0052] Specifically, the degradable connector is made of degradable metal material. The degradable metal material includes but is not limited to one or more combinations of iron, magnesium, and zinc. The degradation products of absorbable metals or alloys are mainly iron, magnesium, and zinc ions, which are essential elements for the human body.

[0053] As a preferred embodiment, the inferior vena cava stent 10a is a cutting type stent 40 or a braided type stent.

[0054] Specifically, the cutting type stent 40 is obtained by integral cutting through laser cutting or mechanical cutting technology; or a plurality of repeated band sub-stents are cut from a tubular material, and then these band sub-stents are expanded and connected into a continuous stent structure.

[0055] Braided stents are made by weaving filaments into a tubular structure through braiding technology. Braided stents have high radial support and good flexibility, and can adapt to the bending and twisting of blood vessels.

[0056] As a preferred embodiment, the common iliac vein stent 20a includes a first stent 201a and a second stent 202a;

[0057] One end of the first bracket 201 a is connected to the second bracket 202 a , and the other end of the first bracket 201 a is connected to the inferior vena cava bracket 10 a via a first connector 30 .

[0058] Specifically, the iliac vein is divided into an inferior vena cava segment and a common iliac vein segment. The inferior vena cava stent 10a is located in the inferior vena cava segment; the common iliac vein stent 20a is located in the common iliac vein segment.

[0059] The common iliac vein segment is divided into a proximal end and a distal end. The first stent 201a is located at the proximal end of the common iliac vein; the second stent 202a is located at the distal end of the common iliac vein.

[0060] The proximal end of the common iliac vein refers to the end of the common iliac vein close to the inferior vena cava. The blood vessels at this end are usually compressed by the right common iliac artery and the fifth lumbar vertebra, resulting in obstruction of venous return. Therefore, it is necessary to design a first stent 201a with a larger radial support force to support this part of the blood vessels.

[0061] The distal end of the common iliac vein refers to the end of the common iliac vein away from the inferior vena cava. The blood vessels at this end are relatively less compressed, and the second stent 202a with a smaller radial support force is used to provide a certain support force to maintain the patency of the blood vessels.

[0062] As a preferred embodiment, the first stent 201a is a cutting stent 40 or a braided stent;

[0063] The second stent 202a is a braided stent.

[0064] Specifically, the diameter rigidity of the proximal end of the common iliac vein is strong, and therefore, the first stent 201a at the proximal end of the common iliac vein may be composed of a cutting type stent 40 or a braided type stent.

[0065] The second stent 202a at the distal end of the common iliac vein is composed of a braided stent and is softer.

[0066] As a preferred embodiment, wherein Figure 2 and Figure 3 As shown, when the first stent 201a of the inferior vena cava stent 10a or the common iliac vein stent 20a is a cutting type stent 40a;

[0067] The cutting type bracket 40a is formed by integral cutting.

[0068] As a preferred embodiment, wherein Figure 4 As shown, the cutting type bracket 40 includes at least two band sub-brackets 41a and 41b, and the at least two band sub-brackets 41a and 41b are connected by a coating connecting rod 42.

[0069] Furthermore, each band sub-bracket is cut and formed in one piece by laser cutting.

[0070] Specifically, the connecting rod 42 between at least two band sub-stents 41a and 41b is connected in the form of a coating. Compared with the integrally cut laser stent, the coated stent has better flexibility and can better adhere to the blood vessel.

[0071] As a preferred embodiment, the radial support force of the inferior vena cava stent 10a is greater than the radial support force of the first stent 201a;

[0072] The radial supporting force of the first bracket 201a is greater than the radial supporting force of the second bracket 202a.

[0073] Specifically, the radial support force of each segment of the stent meets the following conditions: inferior vena cava segment>proximal common iliac vein>distal common iliac vein.

[0074] As a preferred embodiment, the first bracket 201a and the second bracket 202a are integrally formed.

[0075] Furthermore, the first bracket 201a and the second bracket 202a can be connected together in a non-ring manner. The distal end of the first bracket 201a directly passes through the proximal end of the second bracket 202a for connection.

[0076] As a preferred embodiment, the first bracket 201a and the second bracket 202a are connected via a second connecting member (not shown in the figure).

[0077] Further, the second connecting member can be a single ring. As an example and not a limitation, the distal end of the first bracket 201a has a ring, which passes through the proximal end of the second bracket 202a and is closed and connected. Alternatively, the proximal end of the second bracket 202a has a ring, which passes through the distal end of the first bracket 201a and is closed and connected.

[0078] The second connecting member can also be a double ring. As an example but not limitation, the distal end of the first bracket 201a has a first ring, the proximal end of the second bracket 202a has a second ring, one of the first ring or the second ring is an open ring, and the other is a closed ring, and the open ring passes through the closed ring and is closed and connected.

[0079] Furthermore, the second connecting member may be provided as only one or more than one. It should be noted that the number of the second connecting members may be provided according to actual needs, and the present invention does not limit this.

[0080] As a preferred embodiment, the first connector 30 has an open-loop structure, and the open-loop structure of the first connector 30 passes through the inferior vena cava stent 10a and the common iliac vein stent 20a respectively, and then the open-loop structure is closed.

[0081] Specifically, the open-loop structure of the first connecting member 30 can be closed by welding or gluing.

[0082] Furthermore, the first connecting member 30 may be implemented by a hinge mechanism.

[0083] Furthermore, the first connecting member 30 may be implemented with no ring, a single ring, or a double ring.

[0084] Furthermore, the first connecting member 30 may be provided as only one or more. It should be noted that the number of the first connecting member 30 may be provided according to actual needs, and the present invention does not limit this.

[0085] Furthermore, the iliac vein stent 100a of the present invention has a self-expansion function. It is made of memory alloy material and, through heat treatment, allows the iliac vein stent 100a to quickly return to a preset shape after being freed from constraints, thereby achieving a self-expansion effect. This self-expansion property enables the stent to quickly adapt to the shape of the blood vessel or lumen in the in vivo environment, providing a stable support effect.

[0086] Specifically, in a preset configuration, the radial width (ie, diameter) of the inferior vena cava stent 10a is greater than the radial width of the common iliac vein stent 20a.

[0087] Furthermore, the iliac vein stent 100a is sleeved on the periphery of the balloon (not shown in the figure);

[0088] After the balloon is pressurized, the iliac vein stent 100a is in an expanded state.

[0089] Specifically, the iliac vein stent 100a of the present invention may also have a balloon expansion function. Through the pressurization of the external balloon, the stent may expand in a controllable manner to adapt to blood vessels or lumens of different diameters.

[0090] During the balloon expansion process, the metal material of the stent can be evenly stressed, ensuring that the shape after expansion is stable and uniform, avoiding damage to surrounding tissues.

[0091] Furthermore, the inferior vena cava stent 10a is in a post-release form, so that the inferior vena cava stent 10a is positioned more accurately, and the stent is deployed more fully and in closer contact with the blood vessel wall.

[0092] Example 2

[0093] like Figure 5 The structure of the iliac vein stent 100b shown is not much different from that of the iliac vein stent 100a. In the common iliac vein stent 20b, the first stent 201b also adopts a cutting type stent, and the second stent 202b adopts a braided type stent; the main difference is that the inferior vena cava stent 10b adopts a braided type stent.

[0094] Example 3

[0095] like Figure 6 The structure of the iliac vein stent 100c shown is not much different from that of the iliac vein stent 100a. In the common iliac vein stent 20c, the second stent 202c also adopts a braided stent; the main difference is that the inferior vena cava stent 10c and the first stent 201c both adopt braided stents.

[0096] As a preferred embodiment, when the first stent 201c is a braided stent, the pitch of the first stent 201c is smaller than the pitch of the second stent 202c.

[0097] Specifically, the pitch of a braided stent refers to the vertical distance between two adjacent spiral coils or braided wires in the stent.

[0098] The size of the pitch directly affects the flexibility, radial support force and uniformity of the stent covering the vessel wall. A smaller pitch can increase the radial support force of the stent and make it fit the vessel wall better, but it may reduce the flexibility of the stent and increase the difficulty of implantation.

[0099] On the contrary, a larger pitch can improve the flexibility of the stent, making it easier to pass through curved blood vessels, but it may reduce the radial support force and affect the stability of the stent and the coverage of the blood vessel wall.

[0100] In the iliac vein stent 100c of this embodiment, when the common iliac vein stent 20c is composed of a braided stent, the pitch of the first stent 201c at the proximal end is smaller than the pitch of the second stent 202c at the distal end.

[0101] It should be noted that the pitch of the braided stent can be determined according to specific clinical needs and vascular anatomical structure, and the present invention does not limit this.

[0102] In addition to the three embodiments shown above, in the iliac vein stent, the inferior vena cava stent may be a cutting type stent, the first stent may be a braided type stent, and the second stent may be a braided type stent.

[0103] Furthermore, the stents of the inferior vena cava segment, the proximal end of the common iliac vein segment and the distal end of the common iliac vein segment can be combined in the following four ways: cutting type + cutting type + braiding type (see Figure 1 ), cutting type + braiding type + braiding type (not shown in the figure), braiding type + cutting type + braiding type (see Figure 2 ), braided type + braided type + braided type (see Figure 3 ).

[0104] The advantages or beneficial effects of adopting the above technical solution are: the utility model can solve the problem of inferior vena cava compression by adding an inferior vena cava stent, and solves the problem that the iliac vein stent in the existing technology cannot interfere with the inferior vena cava compression, and also avoids the problem that the iliac vein stent enters the inferior vena cava for better anchoring and causes thrombosis; at the same time, the common iliac vein stent is connected to the inferior vena cava stent by a degradable connector, and the inferior vena cava stent can be removed after the degradable connector is degraded, thereby avoiding the inferior vena cava stent from interfering with the vascular structure.

[0105] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the contents of this specification and illustrations should be included in the protection scope of the present invention.

Claims

1. An iliac vein stent, characterized in that: include: Inferior vena cava stents and common iliac vein stents; The common iliac vein stent is connected to the inferior vena cava stent via a first connector; The first connector is a degradable connector, and the degradation of the degradable connector allows the inferior vena cava stent to be removed.

2. The iliac vein stent according to claim 1, characterized in that: The inferior vena cava stent is a cutting type stent or a braided type stent.

3. The iliac vein stent according to claim 1, characterized in that: The common iliac vein stent comprises a first stent and a second stent; One end of the first bracket is connected to the second bracket, and the other end of the first bracket is connected to the inferior vena cava bracket through the first connector.

4. The iliac vein stent according to claim 3, characterized in that: The first stent is a cutting stent or a braided stent; The second stent is a braided stent.

5. The iliac vein stent according to claim 4, characterized in that: When the first stent is a braided stent, the pitch of the first stent is smaller than the pitch of the second stent.

6. The iliac vein stent according to claim 2 or 4, characterized in that: When the first stent of the inferior vena cava stent or the common iliac vein stent is a cutting type stent; The cutting type bracket is formed by integral cutting; or The cutting type bracket includes at least two band sub-brackets, and the at least two band sub-brackets are connected by a coating connecting rod.

7. The iliac vein stent according to claim 3, characterized in that: The radial supporting force of the inferior vena cava stent is greater than the radial supporting force of the first stent; The radial supporting force of the first bracket is greater than the radial supporting force of the second bracket.

8. The iliac vein stent according to claim 3, characterized in that: The first bracket and the second bracket are integrally formed; or The first bracket and the second bracket are connected via a second connecting member.

9. The iliac vein stent according to claim 1, characterized in that: The first connector has an open-loop structure, and the open-loop structure of the first connector passes through the inferior vena cava stent and the common iliac vein stent respectively, and then the open-loop structure is closed.

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