A VA-ECMO femoral artery cannula for providing lower limb blood perfusion

Abstract

This utility model relates to the field of medical devices and provides a VA-ECMO femoral artery cannula for providing lower limb blood perfusion. Addressing the problem of insufficient lower limb blood perfusion and complications caused by existing femoral artery cannulas inserted into the common femoral artery, this utility model includes a main cannula, a branch cannula, and a cuff occlusion mechanism. The branch cannula is connected to the side wall of the main cannula; the cuff occlusion mechanism is internally disposed within the branch cannula for occluding it. Specifically, the branch cannula is located on the distal side of the main cannula, or on the side wall near the connection end of the main cannula. During use, the main cannula is inserted into the patient's common femoral artery, and the branch cannula is inserted into the superficial femoral artery to ensure blood supply to the lower limbs. The cuff occlusion mechanism allows for easy closure of the branch cannula when it is not needed, avoiding unnecessary blood flow distribution; and compared to ordinary valves, the specially designed cuff occlusion mechanism has better applicability.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, and more particularly to a VA-ECMO femoral artery cannula for providing blood perfusion to the lower limbs. Background Technology

[0002] When using VA-ECMO (venous-arterial extracorporeal membrane oxygenation) technology for extracorporeal circulation therapy, blood is typically drawn from the patient's body through femoral artery cannulation, then undergoes gas exchange via an extracorporeal membrane oxygenation device, and finally the oxygenated blood is returned to the body. VA-ECMO is widely used for life support in critically ill patients, especially in cases of heart or lung failure.

[0003] However, during long-term VA-ECMO use, the insertion of the main cannula can compress the common femoral artery, leading to insufficient blood perfusion in the lower limbs. Insufficient blood supply to the lower limbs can trigger a series of complications, such as lower limb ischemia, necrosis, or other tissue damage, significantly impacting the patient's recovery and quality of life. Therefore, ensuring adequate lower limb blood perfusion has become a crucial technical challenge in VA-ECMO treatment.

[0004] Traditional VA-ECMO systems typically provide systemic circulatory support via the main cannula, while lower limb perfusion relies on the patient's natural blood flow or other assistive devices. Prolonged cardiopulmonary bypass can lead to inadequate lower limb perfusion, especially when the femoral artery cannula is positioned too close to or compresses the common femoral artery. Utility Model Content

[0005] The present invention aims to provide a VA-ECMO femoral artery cannula that provides blood perfusion to the lower limbs, which can solve the problem of insufficient blood perfusion to the lower limbs, and also has a mode adjustment function.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A VA-ECMO femoral artery cannula for providing lower limb blood perfusion includes a main cannula, a branch cannula, and a balloon occlusion mechanism. The main cannula is used for blood perfusion of the common femoral artery of the lower limb. The branch cannula is connected to one side of the main cannula and is used for insertion into the superficial femoral artery. The balloon occlusion mechanism is disposed throughout the branch cannula and is used to open or close the branch cannula. Specifically, the branch cannula is located on the distal side of the main cannula, or on the side wall near the connection end of the main cannula.

[0008] With this design, when using VA-ECMO technology, the main cannula for femoral artery cannulation is inserted into the patient's common femoral artery. Depending on the clinical situation, it is selected whether to use a branch cannula. When a branch cannula is not used, the balloon occlusion mechanism is activated to block the inlet of the branch cannula. When a branch cannula is needed, the balloon occlusion mechanism is not activated, and the branch cannula is inserted into the patient's superficial femoral artery.

[0009] The advantages of this design are at least as follows: First, for patients undergoing short-term VA-ECMO treatment and recovering well, only the main cannula for femoral artery cannulation needs to be inserted into the common femoral artery; branch cannulas are unnecessary, avoiding unnecessary wounds and potential sequelae. Second, for patients undergoing long-term VA-ECMO treatment or whose lower limb blood supply may be affected by compression from the main cannula, some patients may be at risk of insufficient lower limb blood perfusion during cardiopulmonary bypass. Therefore, branch cannulas are needed to ensure blood supply to the lower limbs and prevent complications such as lower limb ischemia and necrosis. The above usage examples are for reference only; actual use should be based on a comprehensive clinical assessment.

[0010] Secondly, the advantage of using an airbag sealing mechanism is that ordinary valves have more complex mechanical structures, and the materials used for sealing are generally harder or more expensive. The more complex the structure, the greater the impact on blood flow, specifically, the greater the risk of thrombosis. The hard materials of ordinary valves increase the risk of damaging the pipeline. By cleverly designing the airbag inside the channel, these problems can be avoided, and the cost is not high.

[0011] Furthermore, the main cannula has two connecting ports at the connection point with the branch cannula.

[0012] Furthermore, the cuff occlusion mechanism includes a strip-shaped cuff; one end of the strip-shaped cuff is connected to the tube wall between the two connecting ports, and the other end penetrates the side wall of the endotracheal cannula. Specifically, the shape of the endotracheal cannula and the angle at which the main endotracheal cannula is tilted, combined with the angle at which the strip-shaped cuff is connected to the main endotracheal cannula, aim to minimize the angle between the strip-shaped cuff and the direction of blood flow entering the endotracheal cannula, while ensuring a seal, thereby minimizing any impact on blood flow.

[0013] With this design, the endotracheal tube can be sealed by inflating the strip-shaped balloon. When not sealed, the strip-shaped balloon has a very low impact on blood flow, far lower than conventional valve structures.

[0014] In some embodiments, an auxiliary box is provided at the connection between the main cannula and the branch cannula;

[0015] The auxiliary box has an inflation port that connects to the strip-shaped airbag.

[0016] This design reduces the impact of inflation on the insertion tube and improves durability.

[0017] Preferably, both the main cannula and the branch cannula have an antibacterial coating on their outer walls. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0019] Figure 1 This is a schematic diagram of the VA-ECMO femoral artery cannula for providing lower limb blood perfusion according to the present invention.

[0020] Figure 2 This is a schematic diagram of the main insertion tube and the connecting port of this utility model;

[0021] Figure 3 This is a cross-sectional view of the airbag sealing mechanism of this utility model in its open state.

[0022] Figure 4 This is a cross-sectional view of the airbag sealing mechanism of this utility model in its closed state;

[0023] The components are: 1. Main intubation tube; 11. Connecting port; 12. Connecting end; 13. Insertion end; 2. Branch intubation tube; 3. Airbag sealing mechanism; 31. Strip airbag; 4. Auxiliary box; 41. Inflation port. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solution of this utility model, the technical solution of this utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0025] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "front end", "rear end", "inner side", "outer side", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0027] This embodiment provides a VA-ECMO femoral artery cannula for providing lower limb blood perfusion, such as... Figures 1 to 4 As shown, the device includes a main cannula 1, a branch cannula 2, and a cuff occlusion mechanism 3. The branch cannula 2 is connected to the side wall of the main cannula 1. The cuff occlusion mechanism 3 is disposed throughout the branch cannula 2 and is used to occlude the branch cannula 2. Specifically, the branch cannula 2 is located on the distal side of the main cannula 1. More specifically, the main cannula 1 includes a connecting end 12 and an insertion end 13, and the branch cannula 2 is located on the side wall near the connecting end 12 of the main cannula 1. During use, the main cannula 1 is inserted into the patient's common femoral artery, and the branch cannula 2 is inserted into the superficial femoral artery, providing an auxiliary channel for lower limb blood perfusion. The cuff occlusion mechanism 3 allows the branch cannula 2 to be easily closed when it is not needed, avoiding unnecessary blood flow distribution and ensuring that the blood flow provided by the main cannula 1 is not disturbed. When the branch cannula 2 is used, it is inserted to ensure blood supply to the lower limbs and avoid complications such as lower limb ischemia and necrosis. The blood flow path can be flexibly adjusted according to the patient's clinical needs to optimize blood perfusion. The above usage should be fully evaluated based on actual clinical practice.

[0028] Specifically, when only the main cannula 1 is used, the balloon occlusion mechanism 3 blocks the branch cannula 2. At this time, the main cannula 1 is used as the A tube in VA-ECMO technology and is inserted into the patient's common femoral artery. Since the insertion of the main cannula will reduce blood flow to the lower limb at the placement end, when it is clinically judged that the patient is likely to have complications such as lower limb ischemia and necrosis, the balloon occlusion mechanism 3 does not block the branch cannula 2. Instead, the main cannula 1 is inserted into the patient's common femoral artery and the branch cannula 2 is inserted into the patient's superficial femoral artery. In this way, the branch cannula 2 increases blood flow to the lower limb and effectively avoids complications caused by ischemia.

[0029] The advantages of the airbag occlusion mechanism 3 are that ordinary valves have more complex mechanical structures, and the materials used for sealing are generally harder or more expensive. The more complex the structure, the greater the impact on blood flow; specifically, the greater the risk of thrombosis. Furthermore, the hard materials in ordinary valves increase the risk of damage to the tubing. By cleverly designing the airbag within the channel, these problems can be avoided at a low cost. The design principle of the airbag occlusion mechanism 3 is to achieve the closure or opening of the interstitial cannula 2 through the inflation and deflation of the airbag, avoiding the mechanical complexity and material problems of traditional valve structures. The specially designed airbag-based occlusion mechanism 3 can avoid the risk of wear and tear on the tubing caused by hard materials and the risk of thrombosis, while providing a simple and effective method of blood flow control, and with lower production costs, it helps to reduce the cost of medical equipment.

[0030] Furthermore, the main intubation cannula 1 is provided with two connecting ports 11 at the connection point with the branch intubation cannula 2. The provision of two connecting ports 11 makes the function of the airbag sealing mechanism 3 more reliable, ensures more flexible closure and opening of the inlet of the branch intubation cannula 2, avoids possible seal failure, and further enhances the stability and safety of the intubation system.

[0031] Furthermore, the airbag occlusion mechanism 3 includes a strip-shaped airbag 31; one end of the strip-shaped airbag 31 is connected to the tube wall between the two connecting ports 11, and the other end passes through the side wall of the endotracheal cannula 2. Specifically, the shape of the endotracheal cannula 2 and the angle at which the inclined main endotracheal cannula 1 is set, in conjunction with the angle at which the strip-shaped airbag 31 is connected to the main endotracheal cannula 1, aim to minimize the angle between the strip-shaped airbag 31 and the direction of blood flow entering the endotracheal cannula 2, while ensuring a seal, so as to avoid affecting blood flow as much as possible.

[0032] It is very convenient to use; simply inflating or deflating the airbag 31 is enough to switch between single and double intubation modes.

[0033] By precisely controlling the position and angle of the airbag 31 during inflation, excessive angles between it and the blood flow direction are avoided, reducing the airbag 31's resistance to blood flow and disturbance to blood flow. Simultaneously, it effectively seals the branch channels when inflated. Compared to traditional valve designs, the airbag structure is simpler, its impact on blood flow during inflation is minimal, and its influence on blood flow when deflated is almost negligible, far lower than that of conventional valve structures.

[0034] In some embodiments, an auxiliary box 4 is provided at the connection between the main cannula 1 and the branch cannula 2; the auxiliary box 4 is provided with an inflation port 41, which connects to the strip-shaped airbag 31. The auxiliary box 4 provides an independent space for inflating the airbag 31, making the inflation operation more convenient, reducing the impact on the branch cannula 2 body, and improving the stability and durability of the system. The design of the auxiliary box 4 makes the inflation and deflation operations more precise, and also helps to extend the service life of the airbag sealing mechanism 3.

[0035] Preferably, both the main cannula 1 and the branch cannula 2 have an antibacterial coating on their outer walls.

[0036] The application of an antimicrobial coating effectively reduces bacterial growth on the cannula surface, lowering the risk of infection and thus improving the safety of the device in clinical use. The antimicrobial coating also helps improve the overall system's biocompatibility and extends the device's lifespan in clinical environments.

[0037] Specific application examples:

[0038] When using VA-ECMO (venous-arterial extracorporeal membrane oxygenation) technology for extended periods, the insertion of the main cannula 1 can compress the common femoral artery, potentially leading to insufficient blood perfusion in the lower limbs and causing ischemic complications. Therefore, in clinical practice, a branch cannula 2 is needed to ensure blood supply to the lower limbs and prevent ischemic necrosis. In this case, the VA-ECMO femoral artery cannula of this invention, which provides blood perfusion to the lower limbs, can be used. The method of use is very simple, as follows:

[0039] 1. Single cannula: When clinical judgment determines that only the main cannula 1 is needed, inflate the strip balloon 31 and insert the main cannula 1 into the common femoral artery according to the standard procedure.

[0040] 2. Double cannulation: When clinical judgment indicates that double cannulation is required, there is no need to inflate the strip balloon 31. Simply insert the main cannula 1 into the common femoral artery and the branch cannula 2 into the superficial femoral artery according to the standard procedure.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A VA-ECMO femoral artery cannula for providing lower limb blood perfusion, comprising a main cannula (1) for lower limb common femoral artery blood perfusion, characterized in that, Also includes: A branch cannula (2), connected to one side of the main cannula (1), is used to insert into the superficial femoral artery; An airbag sealing mechanism is disposed through the intubation tube (2) and is used to open or close the intubation tube (2).

2. The VA-ECMO femoral artery cannula for providing lower limb blood perfusion according to claim 1, characterized in that, The main intubation tube (1) has two connecting ports (11) at the connection with the branch intubation tube (2).

3. The VA-ECMO femoral artery cannula for providing lower limb blood perfusion according to claim 2, characterized in that, The airbag sealing mechanism includes a strip-shaped airbag (31). One end of the strip-shaped airbag (31) is connected to the tube wall between the two connecting ports (11), and the other end passes through the side wall of the branch tube (2).

4. The VA-ECMO femoral artery cannula for providing lower limb blood perfusion according to claim 3, characterized in that, An auxiliary box (4) is provided at the connection between the main intubation tube (1) and the branch intubation tube (2); The auxiliary box (4) is provided with an inflation port (41), which is connected to the strip-shaped airbag (31).

5. The VA-ECMO femoral artery cannula for providing lower limb blood perfusion according to claim 1, characterized in that, Both the main cannula (1) and the branch cannula (2) have an antibacterial coating on their outer walls.

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