Medical covered stent

Abstract

The utility model relates to the technical field of interventional therapy medical instruments, in particular to a medical covered stent. Comprising a main stent body and a main film covering layer covering the surface of the main stent body, a forked film covering layer is connected to the side wall of the main film covering layer, and a forked stent body is embedded in the forked film covering layer; the main membrane covering layer and the forked membrane covering layer are both of a tubular structure made of a thin film material, and the main stent body and the forked stent body are both of a circular tubular net-shaped structure formed by weaving metal wires. The covered stent has a protection effect on the inner wall of the blood vessel of a diseased region, no metal wire is arranged at the joint of the main covered layer and the bifurcated covered layer, the covered stent can better adapt to the included angle between the branch artery blood vessel and the aorta blood vessel, adaptability is high, and the branch artery stent has good compliance to the branch artery blood vessel.

Description

Technical Field

[0001] This utility model relates to the field of interventional medical device technology, specifically to a medical covered stent. Background Technology

[0002] Vascular stents are typically implanted into the diseased segment of a blood vessel after balloon angioplasty. This supports the narrowed or occluded segment, reduces elastic recoil and remodeling, and maintains unobstructed blood flow. The stent body is usually a cylindrical mesh structure woven from tantalum wire, medical-grade stainless steel wire, or nickel-titanium alloy wire. Depending on the treatment needs, a thin film can be applied to the inner and outer surfaces of the stent body to form a covered stent. Covered stents are commonly used in interventional vascular procedures, structural heart disease, and respiratory applications. The covering material has sufficient biocompatibility; commonly used materials include PTFE (polytetrafluoroethylene), TPU (polyurethane), silicone polymers, and PET (polyester). As a variant of linear vascular stents, bifurcated stents are typically used for lesions at vascular bifurcation sites. For example, Chinese Patent 2011100390530 discloses a "Branched Aortic Stent Vascular System," with authorization announcement number CN102641164B. This stent includes one aortic stent vessel and three branch artery stent vessels. The aortic stent vessel has a recessed portion in its middle section, and the recessed portion has three side holes. The three branch artery stent vessels are respectively installed in the three side holes. This branched aortic stent vascular system can isolate aortic lesions involving the aortic arch and ascending aorta, can restore blood flow in the branch arteries, avoid custom-made stents, and can be mass-produced for use in emergency surgery. However, in this type of stent, the branch artery stents are directly connected to the sidewall of the aortic stent. The support force at the connection point is strong, but the compliance is insufficient, requiring a high level of skill in surgical operation. In particular, when there is an error between the tilt angle of the branch artery stent and the tilt angle of the branch artery vessel at the lesion site, the pressure exerted by the branch artery stent on the branch artery vessel wall will be uneven, with one side having higher pressure and the other side having lower pressure, affecting the surgical outcome. Utility Model Content

[0003] To overcome the shortcomings of existing technologies, this utility model provides a medical covered stent with strong adaptability and good compliance with branch artery vessels.

[0004] To achieve the above objectives, the present invention adopts the following technical solution;

[0005] The present invention discloses a medical covered stent, comprising a main stent body and a main covered layer covering the surface of the main stent body. A branched covered layer is connected to the side wall of the main covered layer, and a branched stent body is embedded in the branched covered layer. Both the main covered layer and the branched covered layer are tubular structures formed of thin film material, and both the main stent body and the branched stent body are circular tubular mesh structures woven from metal wires.

[0006] With this approach, the cladding layers on the main stent and the bifurcation stent provide a certain degree of protection to the vascular wall at the lesion site. There are no metal wires at the junction of the main cladding layer and the bifurcation cladding layer, which can better adapt to the angle between the branch artery and the aorta. It has strong adaptability and good compliance of the branch artery stent with the branch artery.

[0007] Preferably, the sidewall of the main coating layer is provided with a membrane side hole that communicates with the inner cavity of the branched coating layer, and the main support body is provided with a support side hole corresponding to the position of the membrane side hole; the inner end of the branched coating layer is connected to the membrane side hole, and there is a certain gap between the inner end of the branched support body and the membrane side hole.

[0008] This design improves the compliance of the branch artery stent with the branch artery by increasing the gap between the inner end of the bifurcation stent body and the side hole of the membrane layer, allowing for a greater range of angle changes between the bifurcation stent body and the main stent body.

[0009] Preferably, the diameter of the side hole of the support is larger than that of the side hole of the membrane layer.

[0010] With this solution, the main coating layer around the side holes of the membrane layer is more flexible, which can further improve the flexibility at the junction of the main coating layer and the bifurcation coating layer.

[0011] Preferably, the outer end of the bifurcated support body extends beyond the outer end face of the bifurcated coating layer.

[0012] This solution can be adapted to the needs of different lesion sites.

[0013] Preferably, the sidewall of the main coating layer is connected to two or more branched coating layers, and each branched coating layer is embedded with a branched support body.

[0014] This solution can accommodate the needs of multiple bifurcated blood vessels in the lesion site.

[0015] The beneficial effects of this invention are that the covered stent has a protective effect on the inner wall of the blood vessel at the lesion site, and there are no metal wires at the junction of the main covered layer and the bifurcation covered layer, which can better adapt to the angle between the branch artery and the aorta, and has strong adaptability and good compliance of the branch artery stent to the branch artery. Attached Figure Description

[0016] Figure 1 This is a cross-sectional structural diagram of one embodiment of the present invention.

[0017] Figure 2 This is a cross-sectional structural diagram of another embodiment of the present invention.

[0018] Figure 3 This is a cross-sectional structural diagram of another embodiment of the present invention. Detailed Implementation

[0019] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.

[0020] like Figure 1 As shown, the medical covered stent of this utility model includes a main stent body 1 and a main covering layer 2 covering the surface of the main stent body 1. The main stent body 1 is a cylindrical tube made of tantalum, medical stainless steel, or nickel-titanium alloy wire mesh. The main covering layer 2 is a thin film made of polytetrafluoroethylene, polyurethane, silicone polymer, polyester, or other materials, applied to the inner or outer wall of the cylindrical tube by an impregnation method. A branched covering layer 3 is connected to the side wall of the main covering layer 2, and a branched stent body 4 is embedded in the branched covering layer 3. Both the main covering layer 2 and the branched covering layer 3 are tubular structures formed of thin film materials, and both the main stent body 1 and the branched stent body 4 are cylindrical tubular mesh structures made of woven metal wires. There can be only one branched support body 4 and one branched coating layer 3, or two or more branched supports can be set on the same main support. That is, two or more branched coating layers are connected on the side wall of the main coating layer 2, and each branched coating layer is embedded with a branched support body.

[0021] Taking the thoracic aortic stent as an example, during use, the main stent body 1 is positioned at the lesion site of the thoracic aorta, and the bifurcation stent body 4 is positioned in the branch artery. Since both the main stent body 1 and the bifurcation stent body 4 have a covering layer, they can provide comprehensive protection for the lesion site of the thoracic aorta and the branch artery, as well as the inner wall of the vessel at the junction of the two.

[0022] The main cover layer 2 has a membrane side hole 5 on its side wall, which communicates with the inner cavity of the bifurcation cover layer 3. The main stent body 1 has a stent side hole 6 corresponding to the position of the membrane side hole 5. Both the membrane side hole 5 and the stent side hole 6 are circular holes that fit into the inner cavity of the bifurcation stent body 4, which can avoid the obstruction of blood flow by the metal wire. The inner end of the bifurcation cover layer 3 is connected to the membrane side hole 5, and there is a certain gap between the inner end of the bifurcation stent body 4 and the membrane side hole 5. In this way, the bifurcation stent body 4 and the main stent body 1 are not directly connected, but are connected together through the bifurcation cover layer 3 in the gap between the inner end of the bifurcation stent body 4 and the membrane side hole 5. Usually, the material of the bifurcation cover layer has good conformability and can adapt well to the angle change of the blood vessel bifurcation site, so that both the bifurcation stent body 4 and the main stent body 1 can fit well against the inner wall of the blood vessel.

[0023] In addition, such as Figure 2 As shown, as a further improvement of this utility model, the diameter of the support side hole 6 is larger than that of the membrane side hole 5. At this time, there are no metal wires in the annular area of ​​the main coating layer 2 between the support side hole 6 and the membrane side hole 5, resulting in better flexibility and conformability.

[0024] Depending on the need to protect the vascular lining at the lesion site, the bifurcation stent body 4 can be completely embedded in the bifurcation covering layer 3, or it can be partially embedded, such as... Figure 3 As shown, the outer end of the bifurcated support body 4 extends beyond the outer end face of the bifurcated coating layer 3. Of course, as a further improvement of this utility model, both ends of the main support body 1 can be completely embedded in the main coating layer 2, or one or both ends can extend beyond the end face of the main coating layer 2.

[0025] Contents not described in detail in this specification are prior art known to those skilled in the art. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A medical covered stent, comprising a main stent body (1) and a main covering layer (2) covering the surface of the main stent body (1), characterized in that, The main coating layer (2) is connected to a branched coating layer (3) on its sidewall, and a branched support body (4) is embedded in the branched coating layer (3); the main coating layer (2) and the branched coating layer (3) are both tubular structures formed of thin film material, and the main support body (1) and the branched support body (4) are both circular tube mesh structures woven from metal wire.

2. The medical covered stent according to claim 1, characterized in that, The main coating layer (2) has a membrane side hole (5) on its side wall that connects to the inner cavity of the bifurcated coating layer (3). The main support body (1) has a support side hole (6) corresponding to the position of the membrane side hole (5). The inner end of the bifurcated coating layer (3) is connected to the membrane side hole (5). There is a certain gap between the inner end of the bifurcated support body (4) and the membrane side hole (5).

3. The medical covered stent according to claim 2, characterized in that, The diameter of the side hole (6) of the support is larger than that of the side hole (5) of the membrane layer.

4. A medical covered stent according to claim 2 or 3, characterized in that, The outer end of the bifurcation support body (4) extends out of the outer end face of the bifurcation coating layer (3).

5. A medical covered stent according to any one of claims 1-3, characterized in that, The main coating layer (2) has two or more branched coating layers connected to its sidewall, and each branched coating layer is embedded with a branched support body.

Images