Directionally adjustable arterial cannula

Abstract

This invention discloses a direction-adjustable arterial cannula, comprising a main body and an adjusting portion located on the side of the main body. The main body includes a first end and a second end opposite to each other. The first end is conical and has an injection port for insertion into the femoral artery. The second end has a conduit interface for connecting to the circulatory conduit of an artificial lung. The adjusting portion includes a receiving portion and a guide portion. The receiving portion is connected to the side of the main body. A portion of the guide portion is housed within the receiving portion, and another portion extends from the side near the second end. When the guide portion is pulled towards the second end, it causes the receiving portion and the main body to move together, thereby adjusting the direction of the arterial cannula. This invention achieves alignment of blood flow direction with the cardiac ejection direction by changing the blood flow direction of the arterial cannula, reducing risks.

Description

Technical Field

[0001] This invention belongs to the field of medical devices, specifically relating to an arterial cannula with adjustable orientation. Background Technology

[0002] ECMO (Extracorporeal Membrane Oxygenation), commonly known as "artificial membrane lung" or "ECMO," is a medical emergency device. It is primarily used for critically ill patients with cardiopulmonary dysfunction, such as those experiencing acute cardiogenic shock, respiratory failure, or cardiac arrest. It is also playing a crucial role in the treatment of critically ill COVID-19 patients. Simply put, its function is to draw venous blood out of the body, oxygenate it, and then pump it back into the body. Depending on the blood return route, it is divided into VV-ECMO (venous-to-venous) and VA-ECMO (venous-to-arterial). VV-ECMO is suitable for patients with respiratory failure; it oxygenates venous blood and then returns it to the vein. Because in cases of respiratory failure, the heart function is not impaired, and only gas exchange is required. VV-ECMO is used for critically ill COVID-19 patients. Another type of VA-ECMO is used for patients with heart failure. Blood is drawn from a vein, undergoes gas exchange within the ECMO machine (removing carbon dioxide, adding oxygen), and then returned to the body's aorta, simultaneously replacing the functions of the heart and lungs. Currently, VA-ECMO cannulas are typically inserted into the femoral artery. The returned blood flows from bottom to top, while the heart pumps blood from top to bottom. This can lead to several issues: 1. The opposing blood flow can create turbulence, which can easily lead to thrombosis. 2. Retrograde perfusion increases the afterload of the left ventricle (LV). Increased LV afterload increases myocardial oxygen consumption, further deteriorating LV function and potentially preventing the aortic valve from opening. 3. Retrograde blood flow can cause distal lower limb ischemia, and persistent ischemia can lead to necrosis and even multiple organ failure. Therefore, a directional arterial cannula is needed to regulate blood flow. Summary of the Invention

[0003] This application provides an adjustable arterial cannula, including a main body and an adjustment part located on the side of the main body. The main body includes a first end and a second end opposite to each other. The first end is conical and has an injection hole. The first end is used for insertion into the femoral artery of a human body. The second end has a conduit interface for connecting to the circulatory conduit of an artificial lung. The adjustment part includes a receiving part and a guide part. The receiving part is connected to the side of the main body. A portion of the guide part is housed in the receiving part, and another portion extends out from the side near the second end. When the guide part is pulled toward the second end, the receiving part and the main body can move together to adjust the direction of the arterial cannula.

[0004] In some possible implementations, the receiving portion is integrally formed with the main body, the side of the receiving portion near the first end is a sealed structure for connecting one end of the guide portion, the side of the receiving portion near the second end has a guide opening, the guide portion extends from the guide opening to the outside of the receiving portion, when the guide portion is pulled with a first force, the arterial cannula bends at a first angle; when the guide portion is pulled with a second force until the guide portion disengages from the receiving portion, the arterial cannula bends at a second angle, wherein the second force is greater than the first force, and the second angle is greater than the first angle.

[0005] In some other possible implementations, the opposite ends of the main body portion are aligned with the opposite ends of the receiving portion.

[0006] In some other possible implementations, when the receiving portion is located on one side of the main body, the taper of the arterial cannula on the side near the receiving portion is greater than the taper of the arterial cannula on the side near the main body.

[0007] In some other possible embodiments, a slot is provided on the side of the receiving portion near the guide opening. The slot is located on the inner wall of the receiving portion and communicates with the guide opening. The slot is located on the side of the receiving portion away from the main body. When the guide portion is pulled, the guide portion is partially received in the slot. The slot is used to limit the guide portion.

[0008] In some other possible embodiments, the receiving portion is disposed around the periphery of the main body, the guide portion is located between the main body and the receiving portion, and the guide portion can be pulled circumferentially along the receiving portion to drive the arterial cannula to adjust its direction.

[0009] In some other possible embodiments, the inner wall of the receiving portion is provided with a plurality of evenly extending locking positions, the plurality of locking positions being arranged circumferentially along the receiving portion, and the guide portion being located in different locking positions to adjust the arterial cannula to bend in different directions.

[0010] In some other possible implementations, there are multiple guide portions and multiple receiving portions. The multiple receiving portions are evenly distributed in a ring on the outer periphery of the main body, and the guide portions and the receiving portions are arranged in a one-to-one correspondence.

[0011] In some other possible embodiments, the inner wall of each of the receiving portions is provided with a first limiting groove and a second limiting groove. The first limiting groove and the second limiting groove extend from one end of the receiving portion to the other end, and the first limiting groove and the second limiting groove are disposed at two symmetrical positions of the receiving portion. When the guide portion corresponding to the receiving portion is located in the first limiting groove, the arterial cannula can be bent toward a first position by pulling the guide portion. When the guide portion corresponding to the receiving portion is located in the second limiting groove, the arterial cannula can be bent toward a second position by pulling the guide portion.

[0012] In some other possible implementations, the structural dimensions of the plurality of guide portions are consistent, and the structural dimensions of the plurality of receiving portions are consistent, and the arterial cannula has an axisymmetric structure.

[0013] This application provides an adjustable arterial cannula, comprising a main body and an adjusting portion located on the side of the main body. The main body includes a first end and a second end opposite to each other. The first end is conical and has an injection port for insertion into the femoral artery. The second end has a conical interface for connecting to the circulatory conduit of an artificial lung. The adjusting portion includes a receiving portion and a guiding portion. The receiving portion is connected to the side of the main body. A portion of the guiding portion is housed within the receiving portion, and another portion extends from the side near the second end. When the guiding portion is pulled towards the second end, it moves the receiving portion and the main body together to adjust the direction of the arterial cannula. This invention changes the blood flow direction of the arterial cannula, aligning the blood flow direction with the direction of cardiac ejection. This avoids turbulence caused by reverse blood flow and the blood ejected from the heart, thus preventing thrombosis and reducing the risk of aortic valve failure. It further improves lower limb ischemia. This cannula is characterized by its simple structure, ease of use, and high practicality. Attached Figure Description

[0014] To more clearly illustrate the structural features and effects of this application, a detailed description is provided below in conjunction with the accompanying drawings and specific embodiments. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of an arterial cannula in a straightened state according to an embodiment of this application;

[0016] Figure 2 This is a schematic diagram of an arterial cannula in a bent state according to one embodiment of this application;

[0017] Figure 3 yes Figure 1 A schematic diagram of the structure of the provided arterial cannula with a mesh structure in the receiving part;

[0018] Figure 4 This is a schematic diagram of the arterial cannula in a straightened state according to another embodiment of this application;

[0019] Figure 5 This is a schematic diagram of the structure of an arterial cannula setting slot provided in one embodiment of this application;

[0020] Figure 6 This is a schematic diagram of the structure of an arterial cannulation setting position provided in one embodiment of this application;

[0021] Figure 7 This is a schematic diagram of the structure of the arterial cannula setting limiting groove provided in one embodiment of this application. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort should fall within the scope of protection of this application.

[0023] Please refer to the following: Figure 1 and Figure 2This application provides an adjustable arterial cannula 1, including a main body 10 and an adjustment part 20 located on the side of the main body 10. The main body 10 includes a first end 101 and a second end 102 opposite to each other. The first end 101 is conical and has an injection hole 101a. The first end 101 is used to insert into the femoral artery of the human body. The second end 102 has a pipe interface 102a for connecting to the circulatory pipe of an artificial lung. The adjustment part 20 includes a receiving part 210 and a guide part 220. The receiving part 210 is connected to the side of the main body 10. A portion of the guide part 220 is housed in the receiving part 210, and another portion extends out from the side near the second end 102. When the guide part 220 is pulled toward the second end 102, the receiving part 210 and the main body 10 can be moved together to adjust the direction of the arterial cannula 1.

[0024] The guide portion 220 can be a thin steel wire. One end of the guide portion 220 is connected to the receiving portion 210 near the first end 101, and the other end of the guide portion 220 extends from the receiving portion 210 near the second end 102. The extended portion of the guide portion 220 has a force-applying portion 221, which is used to apply force to the guide portion 220 to pull the arterial cannula 1 towards a preset direction. When the user holds the force-applying portion 221 and pulls the guide portion 220 towards the side near the second end 102, the receiving portion 210 and the main body 10 can bend together in the preset direction, thereby changing the direction of blood flow.

[0025] The receiving portion 210 has a one-way opening structure, meaning that the receiving portion 210 is open only near the second end 102, and the other end is closed. The receiving portion 210 is inserted into the guide portion 220 from the open end, ensuring that the main body 10 remains straight under the support of the guide portion 220 when the arterial cannula 1 is inserted into the femoral artery, facilitating its entry. One end of the main body 10 is a flexible, pointed beveled end, allowing the curved pointed beveled end to automatically bend back after the main body 10 has entered the designated position in the femoral artery, thus changing the direction of blood flow. The conduit interface 102a, the main body 10, the flexible pointed beveled end, and the receiving portion 210 are made of medical-grade polyvinyl chloride plastic. The guide portion 220 is made of stainless steel with a polytetrafluoroethylene coating.

[0026] The directional adjustable arterial cannula 1 provided in this application embodiment includes a main body 10 and an adjustment part 20 located on the side of the main body 10. The main body 10 includes a first end 101 and a second end 102 opposite to each other. The first end 101 is conical and has an injection hole 101a for insertion into the femoral artery of the human body. The second end 102 has a conduit interface 102a for connecting to the circulatory conduit of an artificial lung. The adjustment part 20 includes a receiving part 210 and a guide part 220. The receiving part 210 is connected to the side of the main body 10. A portion of the guide part 220 is housed within the receiving part 210, and another portion extends out from the side near the second end 102. When the guide part 220 is pulled towards the second end 102, the receiving part 210 and the main body 10 can move together to adjust the direction of the arterial cannula 1. This invention changes the blood flow direction of the arterial cannula 1 to make the blood flow direction consistent with the direction of cardiac ejection, avoiding the formation of turbulence between the reverse blood flow and the blood ejected by the heart, thus reducing the risk of aortic valve failure to open and further improving lower limb ischemia. The cannula has the characteristics of simple structure, convenient use and strong practicality.

[0027] Please continue reading. Figure 3 In some embodiments, the inner wall of the receiving portion 210 is embedded with a mesh structure W, the mesh of which is quadrilateral and has a certain degree of elasticity. The guide portion 220 is housed within the mesh structure W. The mesh structure W provides a certain supporting force to the receiving portion 210, allowing it to maintain a certain degree of rigidity, thereby giving the arterial cannula 1 a certain degree of rigidity, which facilitates insertion into the femoral artery. On the other hand, when the guide portion 220 is pulled, the mesh structure W, the receiving portion 210, and the main body 10 can bend together in a certain direction, thereby changing the direction of blood flow. The mesh structure W can play a good stabilizing role in this process, preventing the arterial cannula 1 from bending uncontrollably.

[0028] Furthermore, the mesh size of the mesh structure W on the side of the receiving portion 210 adjacent to the main body 10 is larger than the mesh size of the mesh structure W on the side of the receiving portion 210 away from the main body 10. That is, from the direction close to the main body 10 towards the direction away from the main body 10, the mesh size of the mesh structure W in the receiving portion 210 gradually decreases. This is because when the adjusting portion 20 is bent, the bending radius of the mesh structure W on the side close to the main body 10 is larger, while the bending radius of the mesh structure W on the side away from the main body 10 is smaller. This design makes it easier for the adjusting portion 20 as a whole to bend in the preset direction. In addition, it also allows the arterial cannula 1 to better maintain a certain degree of rigidity.

[0029] Please continue reading. Figure 4 The receiving portion 210 is integrally formed with the main body portion 10. The side of the receiving portion 210 near the first end 101 is a sealed structure for connecting one end of the guide portion 220. The side of the receiving portion 210 near the second end 102 has a guide opening 211. The guide portion 220 extends from the guide opening 211 to the outside of the receiving portion 210. When the guide portion 220 is pulled with a first force, the arterial cannula 1 bends at a first angle. When the guide portion 220 is pulled with a second force until the guide portion 220 disengages from the receiving portion 210, the arterial cannula 1 bends at a second angle. The second force is greater than the first force, and the second angle is greater than the first angle.

[0030] Specifically, one end of the receiving portion 210 is closed and used to connect to one end of the guide portion 220. The other end of the receiving portion 210 is a guide opening 211, and the other end of the guide portion 220 extends from the guide opening 211 of the receiving portion 210. When the user pulls the guide portion 220 towards the outside of the guide opening 211, it can cause the receiving portion 210 and the main body 10 to bend together in a preset direction. When the pulling force of the guide portion 220 is increased, the guide portion 220 can disengage from the receiving portion 210, so that the receiving portion 210 and the main body 10 are stably in a bent state, thereby changing the direction of blood flow.

[0031] The two opposite ends of the main body 10 are aligned with the two opposite ends of the receiving portion 210. The axial direction of the main body 10 is consistent with the axial direction of the receiving portion 210, which helps to maintain the overall strength of the two and the synchronous consistency during bending.

[0032] When the receiving portion 210 is located on one side of the main body 10, the taper of the arterial cannula 1 on the side closer to the receiving portion 210 is greater than the taper of the arterial cannula 1 on the side closer to the main body 10. The greater the taper of the arterial cannula 1, the stronger its flexibility, meaning it is easier to bend. When the taper on the side closer to the receiving portion 210 is greater than the taper on the side closer to the main body 10, it is easier for it to bend towards the receiving portion 210 under the pull of the guide portion 220. In other words, applying a small force to the guide portion 220 is sufficient to bend the receiving portion 210 and the main body 10 together in a predetermined direction, achieving a labor-saving effect.

[0033] Please continue reading. Figure 5The receiving portion 210 has a slot K1 on the side near the guide opening 211. The slot K1 is located on the inner wall of the receiving portion 210 and communicates with the guide opening 211. The slot K1 is located on the side of the receiving portion 210 away from the main body portion 10. When the guide portion 220 is pulled, the guide portion 220 is partially received in the slot K1. The slot K1 is used to limit the guide portion 220.

[0034] Specifically, the slot K1 extends from one end of the receiving portion 210 to the opposite end of the receiving portion 210. The slot K1 is used to limit the guide portion 220. When the guide portion 220 is pulled, the guide portion 220 slides within the slot K1, ensuring that the pulling force is always in one direction. Furthermore, the slot K1 is located on the side of the receiving portion 210 away from the main body 10. By pulling the guide portion 220, the main body 10 can bend towards the receiving portion 210, thereby allowing for directional adjustment of the blood flow direction.

[0035] Please continue reading. Figure 6 The receiving portion 210 is arranged around the periphery of the main body portion 10, and the guide portion 220 is located between the main body portion 10 and the receiving portion 210. The guide portion 220 can be pulled along the periphery of the receiving portion 210 to drive the arterial cannula 1 to adjust its direction.

[0036] Specifically, the arterial cannula 1 has a double-layered nested structure. The main body 10 is located inside the receiving portion 210, which surrounds the periphery of the main body 10. The guide portion 220 connects the main body 10 and the receiving portion 210. In one embodiment, since the guide portion 220 is located between the main body 10 and the receiving portion 210, by pulling the guide portion 220 in any direction, the entire main body 10 and the receiving portion 210 can be bent in any direction, improving the flexibility of the arterial cannula 1 in directional adjustment.

[0037] In another embodiment, the inner wall of the receiving portion 210 is provided with a plurality of evenly extending locking positions K2, which are arranged circumferentially along the receiving portion 210. The guide portion 220 can be located in different locking positions K2 to adjust the bending of the arterial cannula 1 in different directions. Specifically, the number of locking positions K2 can be 2, 4, 6, 8, etc. By placing the guide portion 220 in different locking positions K2, the main body 10 and the receiving portion 210 can be pulled in different directions to bend towards a preset direction, thereby predictively adjusting the bending direction of the arterial cannula 1 and flexibly adjusting the blood flow direction.

[0038] Please continue reading. Figure 7The guide portions 220 and the receiving portions 210 are multiple in number. The multiple receiving portions 210 are evenly distributed in a ring on the outer periphery of the main body 10, and the guide portions 220 and the receiving portions 210 are arranged in a one-to-one correspondence. Specifically, by pulling the pre-arranged guide portions 220 at different positions, the main body 10 and the receiving portions 210 can bend together in a preset direction, improving the accuracy of guiding the arterial cannula 1.

[0039] Each of the receiving portions 210 has a first limiting groove K3 and a second limiting groove K4 on its inner wall. The first limiting groove K3 and the second limiting groove K4 extend from one end of the receiving portion 210 to the other end, and the first limiting groove K3 and the second limiting groove K4 are located at two symmetrical positions of the receiving portion 210. When the guide portion 220 corresponding to the receiving portion 210 is located in the first limiting groove K3, the arterial cannula 1 can be bent toward a first position by pulling the guide portion 220. When the guide portion 220 corresponding to the receiving portion 210 is located in the second limiting groove K4, the arterial cannula 1 can be bent toward a second position by pulling the guide portion 220.

[0040] Specifically, the first limiting groove K3 and the second limiting groove K4 extend in parallel directions. By setting the guide part 220 to be located in different limiting grooves, the main body part 10 and the receiving part 210 bend in different directions as a whole, thereby adjusting the blood flow direction.

[0041] The structural dimensions of the multiple guide portions 220 are consistent, and the structural dimensions of the multiple receiving portions 210 are consistent, and the arterial cannula 1 has an axisymmetric structure. This axisymmetric arrangement allows the arterial cannula 1 to be subjected to more uniform force under the tension of the guide portions 220, reducing the occurrence of internal force concentration problems and helping to more accurately control the curvature of the arterial cannula 1.

[0042] The directional adjustable arterial cannula 1 provided in this application embodiment includes a main body 10 and an adjustment part 20 located on the side of the main body 10. The main body 10 includes a first end 101 and a second end 102 opposite to each other. The first end 101 is conical and has an injection hole 101a for insertion into the femoral artery of the human body. The second end 102 has a conduit interface 102a for connecting to the circulatory conduit of an artificial lung. The adjustment part 20 includes a receiving part 210 and a guide part 220. The receiving part 210 is connected to the side of the main body 10. A portion of the guide part 220 is housed within the receiving part 210, and another portion extends out from the side near the second end 102. When the guide part 220 is pulled towards the second end 102, the receiving part 210 and the main body 10 can move together to adjust the direction of the arterial cannula 1. This invention changes the blood flow direction of the arterial cannula 1 to make the blood flow direction consistent with the direction of cardiac ejection, avoiding the formation of turbulence between the reverse blood flow and the blood ejected by the heart, thus reducing the risk of aortic valve failure to open and further improving lower limb ischemia. The cannula has the characteristics of simple structure, convenient use and strong practicality.

[0043] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A direction-adjustable arterial cannula, comprising a main body and an adjustment portion located on the side of the main body, characterized in that: The main body includes a first end and a second end opposite to each other. The first end is conical and has an injection hole for inserting into the femoral artery of the human body. The second end has a conduit interface for connecting to the circulatory conduit of an artificial lung. The adjustment part includes a receiving part and a guide part. The receiving part is connected to the side of the main body. A portion of the guide part is housed in the receiving part, and another portion extends out from the side near the second end. When the guide part is pulled toward the second end, it can drive the receiving part and the main body to move together to adjust the direction of the arterial cannula. The receiving part is inserted into the guide part from the open end, so that when the arterial cannula is inserted into the femoral artery, the main body is straight under the support of the guide part; One end of the main body is a flexible pointed bevel end, so that after the main body enters the designated position of the femoral artery, the guide part can be pulled out from the receiving part, and the curved pointed bevel end can automatically bend back.

2. The arterial cannula of claim 1, wherein, The receiving portion is integrally formed with the main body. The side of the receiving portion near the first end is a sealed structure for connecting one end of the guide portion. The side of the receiving portion near the second end has a guide opening. The guide portion extends from the guide opening to the outside of the receiving portion. When the guide portion is pulled with a first force, the arterial cannula bends at a first angle. When the guide portion is pulled with a second force until the guide portion disengages from the receiving portion, the arterial cannula bends at a second angle. The second force is greater than the first force, and the second angle is greater than the first angle.

3. The arterial cannulation as described in claim 2, characterized in that, The two opposite ends of the main body are aligned with the two opposite ends of the receiving part.

4. The arterial cannula of claim 2, wherein the distal end of the cannula is tapered to a point. When the receiving portion is located on one side of the main body, the taper of the arterial cannula on the side closer to the receiving portion is greater than the taper of the arterial cannula on the side closer to the main body.

5. The arterial cannula of claim 2, wherein, The receiving part has a slot on the side near the guide opening. The slot is located on the inner wall of the receiving part and communicates with the guide opening. The slot is located on the side of the receiving part away from the main body. When the guide part is pulled, the guide part is partially received in the slot. The slot is used to limit the guide part.

6. The arterial cannula of claim 2, wherein, There are multiple guide portions and multiple receiving portions. The multiple receiving portions are evenly distributed in a ring on the outer periphery of the main body. The guide portions and the receiving portions are arranged in a one-to-one correspondence.

7. The arterial cannula of claim 6, wherein, Each of the receiving portions has a first limiting groove and a second limiting groove on its inner wall. The first limiting groove and the second limiting groove extend from one end of the receiving portion to the other end, and the first limiting groove and the second limiting groove are located at two symmetrical positions of the receiving portion. When the guide portion corresponding to the receiving portion is located in the first limiting groove, the arterial cannula can be bent toward a first position by pulling the guide portion. When the guide portion corresponding to the receiving portion is located in the second limiting groove, the arterial cannula can be bent toward a second position by pulling the guide portion.

8. The arterial cannula of claim 6, wherein, The structure size of the plurality of guiding portions is consistent, and the structure size of the plurality of accommodating portions is consistent, and the arterial cannula is an axisymmetric structure.

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