Drainage device

Abstract

The drainage device comprises a supporting part and a main body used for shielding the inner wall of a left atrial appendage, the main body comprises a containing cavity with an opening facing the near-end side, and the supporting part is at least connected with or abuts against the near-end side of the main body and used for supporting the main body to be fixed to a preset position. Compared with the prior art, the cavity of the main body of the drainage device is used for replacing the inner cavity of the auricular appendage, so that blood which originally needs to pass through the rough inner wall surface of the auricular appendage, is reduced in flow velocity and is easy to generate thrombus passes through the cavity of the main body, and thrombus is avoided; and the problem that the volume of the left heart is increased possibly due to the fact that the left atrium pressure is increased when the inner cavity of the auricle is filled in an existing auricle plugging technology is also avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of interventional medical equipment, in particular to a drainage device. Background Art

[0002] The pectinate muscles on the inner wall of the atrial appendage are well developed and not smooth. For patients with atrial fibrillation, the blood flow inside the atrial appendage is significantly slowed down, which will cause blood stasis in the atrial appendage, thereby forming blood clots and causing stroke. Traditional surgery uses left atrial appendage occlusion to block the left atrial appendage, thereby preventing the blood clots in the atrial appendage from escaping into the brain. The left atrial appendage is a narrow, curved blind-end structure extending forward and downward along the anterior wall of the left atrium. It has active contraction and secretion functions, which are of great significance in relieving increased pressure in the left atrium and ensuring left ventricular filling. Blocking the left atrial appendage may cause increased left atrial pressure, which may lead to an increase in left heart volume, and ultimately lead to complications such as heart failure. Utility Model Content

[0003] Based on this, it is necessary to provide an improved drainage device to address the problem that the existing atrial appendage closure causes increased left atrial pressure, which may lead to an increase in left heart volume.

[0004] A drainage device comprises a support portion and a main body for shielding the inner wall of a left atrial appendage, wherein the main body comprises a cavity with an opening toward a proximal side, and the support portion at least connects to or abuts against a proximal side of the main body to support and fix the main body in a predetermined position.

[0005] In one embodiment, the main body includes a sac-shaped portion, and the inner surface of the proximal end of the sac-shaped portion is smooth.

[0006] In one embodiment, the sac-like portion includes an inner cavity, and liquid or gas can be injected into the inner cavity.

[0007] In one embodiment, the support portion is sleeved on the outside of the main body.

[0008] In one embodiment, an anchoring device is provided on the support portion, and the anchoring device includes an anchoring thorn structure with a pointed end.

[0009] In one embodiment, the support portion includes a support body, and the support body includes a rod obtained by cutting a metal alloy tube or a polymer tube and / or a braided structure made by braiding or winding braided wires.

[0010] In one embodiment, a coating is provided on the surface of the support portion.

[0011] In one embodiment, the inner surface of the main body and the inner surface of the support portion have a smooth transition or are coplanar.

[0012] In one embodiment, the axial length of one side of the support portion is greater than the length of the other side thereof.

[0013] In one embodiment, the support portion includes a first part and a second part that are connected, and in the release stage, the first part flips outward relative to the second part.

[0014] Compared with the prior art, the above-mentioned drainage device replaces the inner cavity of the atrial appendage with the cavity of the main body, allowing the blood flow that originally needs to pass through the rough inner wall surface of the atrial appendage and has a reduced flow rate and is prone to thrombosis to pass through the cavity of the main body as a substitute, thereby avoiding the formation of thrombosis and also avoiding the problem of increased left atrial pressure caused by filling the inner cavity of the atrial appendage in the prior atrial appendage occlusion technology, which may lead to an increase in the left heart volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the auricle position;

[0016] Figure 2 This is a schematic diagram of the working of the drainage device in one embodiment of the utility model;

[0017] Figure 3 This is a schematic diagram of the operation of a drainage device in another embodiment of the present invention. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0019] It should be noted that in the field of interventional medical devices, the end of a medical device implanted in a human or animal body that is closer to the operator is generally referred to as the "proximal end", and the end that is farther from the operator is referred to as the "distal end", and the "proximal end" and "distal end" of any component of the medical device are defined based on this principle. "Axial" generally refers to the length direction of the medical device when it is transported, and "radial" generally refers to the direction of the medical device perpendicular to its "axial direction", and the "axial" and "radial" of any component of the medical device are defined based on this principle. The "connection" mentioned in the embodiments includes the situation where two components are directly connected and indirectly connected with the help of other components.

[0020] The technical solution of the present utility model will be further described in detail below in conjunction with specific embodiments.

[0021] Reference Figure 1 , Figure 1Schematic diagram of the structure of the left atrial appendage. The blood flow direction moves from the atrial appendage 10 toward the mitral valve 20. When the blood enters the atrial appendage 10, the inner wall of the atrial appendage 10 includes a plurality of pectinate muscles 11, resulting in a slower blood flow rate on the surface of the pectinate muscles 11, that is, blood stagnates in the atrial appendage, which is prone to thrombus formation. Figure 2 The utility model provides a drainage device 100, which includes a main body 110 and a support portion 120. At least a portion of the main body 110 is located at the distal end of the proximal side of the support portion 120, and the distal side of the main body 110 is attached to or close to the inner wall of the auricle. The main body 110 is used to shield the inner surface of the auricle 10, and the support portion 120 is connected to or abutted against at least the proximal side of the main body 110, and is used to support the main body 110 to fix it in a predetermined position.

[0022] In this embodiment, the main body 110 includes a sac-like portion, which surrounds a cavity with an opening toward the auricle, and the inner surface of the proximal end of the sac-like portion is smooth, so as to reduce or avoid blood stasis when blood flows in and out of the sac-like portion. It should be noted that smooth here does not refer to smoothness in an absolute sense, but includes the surface state of smooth surfaces without protrusions, corners, etc. In another embodiment, the inner surface of the cavity (sac-like portion) of the main body 110 is smooth, so as to ensure that blood flow will not stagnate during the entire flow stage. When the blood flows into the auricle and flows along the proximal surface of the main body 110, the risk of thrombosis is low because it will not encounter uneven structures such as pectinate muscles. In this embodiment, the main body 110 is made of polymer materials, such as TPU, silicone, etc. When the main body 110 is attached to or close to the inner wall of the auricle, the support part 120 is fixed to the opening position of the auricle. On the one hand, it prevents the main body 110 from falling off from the auricle, and on the other hand, it maintains the shape of the main body 110 implanted in the auricle. Since the main body 110 in this embodiment includes a saccular part, the support part 120 in this embodiment also serves to maintain the opening of the saccular part.

[0023] Furthermore, the support portion 120 is located outside the body 110, that is, the proximal inner surface of the body 110 extends and covers the support portion 120 circumferentially. In other words, the inner surface of the body 110 completely covers the contact position between the support portion 120 and the body 110 circumferentially.

[0024] In another embodiment, the proximal end of the support portion 120 is located at the proximal end of the main body 110 , and the inner surface of the main body 110 and the inner surface of the support portion 120 smoothly transition or are coplanar.

[0025] In another embodiment, the sac-like portion of the main body 110 is a double-layer structure including an inner cavity, and the inner cavity is filled with liquid or gas, so that the main body 110 has adaptability and can better adhere to the inner wall of the auricle.

[0026] In another embodiment, the support portion 120 includes a plurality of connecting rods to form a shape support for the main body 110 at the atrial appendage opening position.

[0027] In another embodiment, the support portion 120 includes a mesh structure formed by weaving, which not only serves as a shape support for the main body 110 at the atrial appendage opening position, but also has high flexibility and can adapt to the expansion and relaxation of the atrial appendage.

[0028] In another embodiment, the support portion 120 includes a support body and a coating covering the surface of the support body. The purpose of the support body is to support the overall shape of the drainage device 100, and the coating is to isolate the stent and blood flow to ensure the normal flow of blood, thereby avoiding the skeleton structure of the support body from being contaminated by blood and preventing blood from contacting the support body to form thrombus.

[0029] The support body may be a rod obtained by cutting a metal alloy tube or a polymer tube, or may be a braided structure made by braiding or winding braided wires.

[0030] In another embodiment, along the axial direction, the axial length of one side of the support portion 120 is greater than that of the other side, and the longer side is arranged on the blood outflow side or the blood inflow side of the atrial appendage opening to improve the blood flow on the outflow side or the blood inflow side. It should be noted that this is a design combined with the direction of intracardiac blood flow and is only applicable to the structure corresponding to this embodiment.

[0031] In another embodiment, an anchoring device is provided on the support portion 120, and the anchoring device includes an anchoring barb structure with a pointed end, and the orientation of the anchoring barb is preferably inclined to extend outward toward the proximal end.

[0032] In another embodiment, referring to Figure 3 The utility model provides a drainage device 200, which includes an improved support portion 130, and the support portion 130 includes a first part 1301 and a second part 1302 that are connected, wherein a distal end of the first part 1301 abuts against the edge of the atrial appendage opening, and a distal end of the second part 1302 abuts against the inner wall of the atrial appendage. In terms of structure, the second part 1302 and the main body 110 have a smooth transition, and the first part 1301 is flipped relative to the second part 1302 and the main body. The first part 1301 also plays a role in guiding blood flow into the main body 100 and guiding blood flow out. This arrangement avoids the occurrence of wrinkles at the atrial appendage opening, which causes slow blood flow and the formation of thrombus.

[0033] That is to say, for the support portion 130, the first portion 1301 can be flipped outward relative to the second portion 1302. Specifically, during the release process, the first portion 1301 gradually flips outward relative to the second portion 1302 and finally fits to the edge of the atrial appendage opening. In another embodiment, the first portion 1301 is not a symmetrical structure, but one side is longer and the other side is shorter or even zero, and the longer side is arranged at the blood outflow side or the blood inflow side of the atrial appendage opening to improve the blood flow on the outflow side or the inflow side.

[0034] In another embodiment, the supporting portion 130 may include only the first portion or only the second portion.

[0035] In other embodiments, the first part 1301 of the support portion 130 includes a first support body, and the second part 1302 of the support portion 130 includes a second support body, the first support body includes a rod obtained by cutting a metal alloy tube or a polymer tube, and the second support body includes a woven structure made by weaving or winding braided wires; or, the first support body includes a woven structure made by weaving or winding braided wires, and the second support body includes a rod obtained by cutting a metal alloy tube or a polymer tube; or, the first support body and the second support body both include a rod obtained by cutting a metal alloy tube or a polymer tube; or, the first support body and the second support body both include a woven structure made by weaving or winding braided wires.

[0036] In another embodiment, the fixing portion is a metal bracket structure, a woven mesh structure, etc., and the material is a metal material, such as nickel titanium wire, etc.

[0037] It should be noted that the embodiments of the present utility model will not significantly reduce the overall size of the interior of the left atrium, that is, the original left atrial appendage cavity is retained as much as possible. In addition, the technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the various technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0038] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A drainage device, characterized in that: It comprises a supporting part and a main body for shielding the inner wall of the left atrial appendage, wherein the main body comprises a cavity with an opening toward the proximal side, and the supporting part is at least connected to or abuts against the proximal side of the main body for supporting the main body to be fixed at a predetermined position.

2. The drainage device according to claim 1, characterized in that: The main body comprises a sac-shaped portion, and the inner surface of the proximal end of the sac-shaped portion is smooth.

3. The drainage device according to claim 2, characterized in that: The bladder portion includes an inner cavity into which liquid or gas can be injected.

4. The drainage device according to claim 1, characterized in that: The support portion is sleeved on the outer side of the main body.

5. The drainage device according to claim 4, characterized in that: An anchoring device is arranged on the supporting part, and the anchoring device comprises an anchoring thorn structure with a pointed end.

6. The drainage device according to claim 1, characterized in that: The support portion comprises a support body, and the support body comprises a rod obtained by cutting a metal alloy tube or a polymer tube and / or a braided structure made by braiding or winding braided wires.

7. The drainage device according to claim 1, characterized in that: A coating is provided on the surface of the support portion.

8. The drainage device according to claim 1, characterized in that: The inner surface of the main body and the inner surface of the support portion are smoothly transitioned or coplanar.

9. The drainage device according to claim 1, characterized in that: Along the axial direction, the axial length of one side of the support portion is greater than the length of the other side opposite thereto.

10. The drainage device according to claim 1, characterized in that: The support portion includes a first portion and a second portion that are connected, and in a release stage, the first portion is flipped outward relative to the second portion.

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