Double-cavity femoral vein cannula

Abstract

The utility model relates to the technical field of medical apparatus and instruments, and provides a double-cavity femoral vein cannula which comprises a body, a first channel, a second channel, a first cavity and a second cavity. The outer pipe is arranged at one end of the body, an outlet of the outer pipe is communicated with an inlet of the first channel, and a plurality of first drainage holes are formed in the pipe wall of the outer pipe in the axial direction of the outer pipe at intervals; one end of the inner tube is inserted into the outer tube and communicated with the inlet of the second channel, the other end of the inner tube extends out of the outer tube to form an exposed section, and a port of the exposed section forms a second drainage hole; and a gap for lower cavity venous blood to pass through is reserved between the outer wall of the inner tube and the inner wall of the outer tube. According to the double-cavity femoral vein cannula, due to the fact that the first drainage holes are formed in the whole outer tube in the length direction, the inner tube can be allowed to be adjusted within a certain range, and the inferior vena cava drainage effect can be taken into consideration while the superior vena cava drainage effect is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a double-lumen femoral vein cannula. Background Art

[0002] Femoral vein cannulation is essential for various minimally invasive surgeries, robotic surgeries, major vascular surgeries, and secondary surgeries. Traditional femoral vein cannulation is typically an imported cannula with a drainage hole at the front. During placement, the cannula is placed in the superior vena cava to drain the superior vena cava blood. A further drainage hole is located a certain distance from the front end to drain the blood returning from the inferior vena cava. However, for individuals with a relatively large weight but a relatively small stature, when comparing femoral vein cannulation with a corresponding weight, the inferior vena cava drainage hole is positioned downward when the superior vena cava drainage is ideal. This necessitates the "upward" femoral vein cannulation to ensure optimal drainage of the inferior vena cava, often affecting the already ideal drainage of the superior vena cava, making it difficult to achieve both. Utility Model Content

[0003] Therefore, the technical problem to be solved by the present invention is that it is difficult to simultaneously drain the superior vena cava and the inferior vena cava when the femoral vein cannula in the prior art is used in China, so a double-lumen femoral vein cannula is provided.

[0004] In order to solve the above technical problems, the technical solutions of the present utility model are as follows:

[0005] The utility model provides a double-lumen femoral vein cannula, comprising: a main body, wherein the main body is provided with a first channel and a second channel which are independent of each other; an outer tube, which is arranged at one end of the main body, wherein the outlet of the outer tube is connected with the inlet of the first channel, and a plurality of first drainage holes are arranged at intervals on the tube wall of the outer tube along the axial direction of the outer tube, and the outer tube is used to be placed in the inferior vena cava for drainage; an inner tube, wherein one end is inserted into the outer tube and is connected with the inlet of the second channel, and the other end extends from the outer tube to form an exposed section, wherein the port of the exposed section constitutes the second drainage hole, and the exposed section is used to be placed in the superior vena cava for drainage; a gap is left between the outer wall of the inner tube and the inner wall of the outer tube for the passage of inferior vena cava blood.

[0006] Furthermore, the inner tube and the outer tube are arranged concentrically.

[0007] Furthermore, the intervals between two adjacent first drainage holes along the axial direction of the outer tube are equal.

[0008] Furthermore, a plurality of the first drainage holes are arranged at equal intervals along the circumferential direction of the outer tube.

[0009] Furthermore, the inner diameter of the outer tube gradually decreases in a direction approaching the exposed section.

[0010] Furthermore, the inner diameter of the inner tube gradually decreases in a direction approaching the exposed section.

[0011] Furthermore, the length of the outer tube ranges from 8 cm to 12 cm.

[0012] Furthermore, the length of the exposed section ranges from 4 cm to 6 cm.

[0013] The technical solution of this utility model has the following advantages:

[0014] The double-lumen femoral vein cannula provided by the present invention is used by placing the outer tube into the inferior vena cava, and the inferior vena cava blood enters the gap between the outer tube and the inner tube through the first drainage hole, and finally enters the first channel. The inner tube is placed into the superior vena cava, and the superior vena cava blood enters the inner tube through the second drainage hole, and finally enters the second channel. Compared with the fixed distance between the front and rear drainage holes on the existing femoral vein cannula, since the first drainage holes are provided along the entire length of the outer tube, the inner tube can be allowed to be adjusted within a certain range and while ensuring the drainage effect of the superior vena cava, the drainage effect of the inferior vena cava can also be taken into account at the same time. Moreover, compared with the use of a single channel for drainage, since the superior vena cava blood and the inferior vena cava blood are drained through different channels, the drainage conditions of the superior vena cava and the inferior vena cava can be obtained more intuitively. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 Schematic diagram of a double-lumen femoral vein cannula in an embodiment of the present invention;

[0017] Figure 2 It is a schematic diagram of the enlarged local structure of the double-lumen femoral vein cannula in an embodiment of the present utility model.

[0018] Description of reference numerals:

[0019] 1. Main body; 2. Outer tube; 3. Inner tube; 4. Exposed section; 5. First drainage hole; 6. Second drainage hole. DETAILED DESCRIPTION

[0020] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0021] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0023] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0024] like Figure 1 、 Figure 2As shown, this embodiment provides a double-lumen femoral venous cannula, comprising: a body 1 having a first channel and a second channel independently formed therein. For example, the body 1 may be a double-layered cannula, wherein the space between the inner and outer cannulae serves as the first channel, and the space within the inner cannula serves as the second channel; an outer tube 2 which may be bonded to one end of the body 1, wherein the outlet of the outer tube 2 communicates with the inlet of the first channel, and a plurality of first drainage holes 5 are provided on the wall of the outer tube 2 at intervals along the axial direction of the outer tube 2, and the outer tube 2 is configured to be placed in the inferior vena cava for drainage; an inner tube 3 having one end inserted into the outer tube 2 and bonded to the body 1, wherein the connection between the inner tube 3 and the outer tube 2 is sealed, wherein one end of the inner tube 3 inserted into the outer tube 2 communicates with the inlet of the second channel, and the other end extends from the outer tube 2 to form an exposed section 4, wherein the end of the exposed section 4 constitutes a second drainage hole 6, and the exposed section 4 is configured to be placed in the superior vena cava for drainage; a gap is left between the outer wall of the inner tube 3 and the inner wall of the outer tube 2 for the passage of blood from the inferior vena cava.

[0025] The dual-lumen femoral venous cannula provided in this embodiment is used by placing the outer tube 2 into the inferior vena cava, with the ends of the outer tube 2 sealed, so that the inferior vena cava blood enters the gap between the outer tube 2 and the inner tube 3 through the first drainage hole 5 on the side wall of the outer tube 2, and ultimately enters the first channel. The inner tube 3 is then placed into the superior vena cava, and the superior vena cava blood enters the inner tube 3 through the second drainage hole 6, and ultimately enters the second channel. Compared to conventional femoral venous cannulas with a fixed distance between the front and rear drainage holes, this arrangement allows the inner tube 3 to be adjusted within a certain range, and while ensuring the superior vena cava drainage effect, the inferior vena cava drainage effect can also be taken into account. Moreover, compared to single-channel drainage, since the superior vena cava blood and the inferior vena cava blood are drained through different channels, the drainage conditions of the superior vena cava and the inferior vena cava can be more intuitively obtained.

[0026] The inner tube 3 can be arranged concentrically with the outer tube 2, and the gap between the inner tube 3 and the outer tube 2 is uniform in the entire circumferential direction, thereby ensuring the stability of the blood flow in the inferior vena cava.

[0027] The intervals between two adjacent first drainage holes 5 in the axial direction of the outer tube 2 can be equal. Multiple first drainage holes 5 are evenly spaced along the circumferential direction of the outer tube 2. This arrangement allows for drainage of the inferior vena cava blood in any direction along the entire circumference of the outer tube 2, thereby improving reliability.

[0028] The inner diameter of the outer tube 2 gradually decreases as it approaches the exposed section 4; the inner diameter of the inner tube 3 gradually decreases as it approaches the exposed section 4. For example, both the outer tube 2 and the inner tube 3 can be tapered tubes with gradually decreasing inner diameters to reduce resistance during implantation.

[0029] The length of the outer tube 2 can range from 8 cm to 12 cm. For example, based on the physical characteristics of Chinese people, the outer tube 2 can be divided into three lengths: the first length is 8 cm, the second length is 10 cm, and the third length is 12 cm. This configuration can accommodate different populations.

[0030] The length of the exposed section 4 ranges from 4 cm to 6 cm. For example, based on the physical characteristics of Chinese people, the length of the exposed section 4 can be divided into three specifications: the first specification has a length of 4 cm, the second specification has a length of 5 cm, and the third specification has a length of 6 cm. This arrangement can accommodate different groups of people.

[0031] The first drainage hole 5 may be a circular hole, an elliptical hole, a square hole, etc., and the second drainage hole 6 may be a circular hole, an elliptical hole, a square hole, etc.

[0032] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A double-lumen femoral vein cannula, characterized in that: include: A body (1), wherein the body (1) has a first channel and a second channel that are independent of each other; An outer tube (2) is provided at one end of the body (1), the outlet of the outer tube (2) is connected to the inlet of the first channel, and a plurality of first drainage holes (5) are provided on the wall of the outer tube (2) at intervals along the axial direction of the outer tube (2). The outer tube (2) is used to be placed in the inferior vena cava for drainage; An inner tube (3) has one end inserted into the outer tube (2) and connected to the entrance of the second channel, and the other end extends from the outer tube (2) to form an exposed section (4), the port of the exposed section (4) forming a second drainage hole (6), and the exposed section (4) is used to be placed in the superior vena cava for drainage; a gap is left between the outer wall of the inner tube (3) and the inner wall of the outer tube (2) for the inferior vena cava blood to pass through.

2. The double-lumen femoral vein cannula according to claim 1, characterized in that: The inner tube (3) and the outer tube (2) are arranged concentrically.

3. The double-lumen femoral vein cannula according to claim 1, characterized in that: The intervals between two adjacent first drainage holes (5) along the axial direction of the outer tube (2) are equal.

4. The double-lumen femoral vein cannula according to claim 1, characterized in that: A plurality of first drainage holes (5) are arranged at equal intervals along the circumferential direction of the outer tube (2).

5. The double-lumen femoral vein cannula according to claim 1, characterized in that: The inner diameter of the outer tube (2) gradually decreases in a direction approaching the exposed section (4).

6. The double-lumen femoral vein cannula according to claim 1, characterized in that: The inner diameter of the inner tube (3) gradually decreases in a direction approaching the exposed section (4).

7. The double-lumen femoral vein cannula according to claim 1, characterized in that: The length of the outer tube (2) ranges from 8 cm to 12 cm.

8. The double-lumen femoral vein cannula according to claim 1, characterized in that: The length of the exposed section (4) ranges from 4 cm to 6 cm.

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