ECMO femoral artery cannula for lower limb blood perfusion

Abstract

The invention discloses an ECMO femoral artery cannula for lower limb blood perfusion, comprising: a cannula body, one end of which is provided with a liquid outlet part and the other end of which is provided with a liquid inlet, the inside of which is set to be a through structure; the longitudinal ring air bag is arranged at the position, close to the liquid outlet part, of the cannula body, a channel penetrating through the longitudinal ring air bag is formed in the longitudinal ring air bag, after the size of the longitudinal ring air bag is expanded, the length direction of the channel in the longitudinal ring air bag is parallel to the axial direction of the longitudinal ring air bag, and the longitudinal ring air bag is used for making contact with the inner wall of a femoral artery blood vessel after being inflated. The device has the advantages that the overall structure is simple, femoral artery blood flow can maintain lower limb far-end perfusion through the longitudinal ring air bag through the channel formed in the longitudinal ring air bag, the intubation depth can be positioned through the longitudinal ring air bag, the influence of inconvenient operation of a complex intubation structure is completely avoided, meanwhile, the phenomena of blockage and damage are not prone to occurring, and the device is suitable for popularization and application. And the practical application effect is better.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to an ECMO femoral artery cannula for lower limb blood perfusion. Background Technology

[0002] Extracorporeal membrane oxygenation (ECMO), or simply membrane lung, is a new technology for rescuing critically ill patients. Essentially, ECMO is a modified artificial heart-lung machine, with its core components being the membrane lung and blood pump, which function as artificial lungs and an artificial heart, respectively. During ECMO operation, blood is drawn from a vein, passes through the membrane lung to absorb oxygen and expel carbon dioxide, and after gas exchange, the blood is either returned to a vein (VV-ECMO) or an artery (VA-ECMO) by the pump. The former is primarily used for external respiratory support, while the latter, because the blood pump can replace the heart's pumping function, can be used for both external respiratory and cardiac support.

[0003] Among them, VA-ECMO has been widely used in clinical practice due to its simple and convenient operation and ability to quickly initiate cardiopulmonary support. When performing VA-ECMO, the femoral artery is the first choice for adult VA-ECMO because it is located superficially and is easy to access. It can be directly inserted through percutaneous puncture or incision without affecting cardiopulmonary resuscitation.

[0004] The existing application number 202110095068.2, patent titled "VA-ECMO Femoral Artery Catheterization and Placement Method for Lower Limb Blood Perfusion," discloses that the cannula includes a cannula body and a puncture guide. The cannula body has an independent main lumen and a side lumen. The main lumen is a through structure, and a main lumen side hole is opened on the outer side of the front end of the main lumen. The side lumen wraps around the outer periphery of the rear end of the main lumen, and a side lumen side hole is opened on the outer side of the side lumen along the same front-rear straight line. The cannula body has an annular air bladder between the main lumen side hole and the side lumen side hole, and a bulging air bladder is provided on the rear end extension line of the side lumen side hole. Both the annular air bladder and the bulging air bladder are connected to air bladder ports for inflation and deflation. The disclosed VA-ECMO femoral artery cannulation and placement method for providing lower limb blood perfusion uses a two-cavity design. After prolonged use, the cannula is easily affected by different pressures, causing deformation inside the cavities and leading to overall cannula failure. In addition, the cannula has many structures, and during use, some structures are inevitably bumped or knocked, making the entire cannula unusable or displaced, resulting in poor performance. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an ECMO femoral artery cannula for lower limb blood perfusion.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: An ECMO femoral artery cannula for lower limb blood perfusion includes: The cannula body has a liquid outlet at one end and a liquid inlet at the other end, and the interior of the cannula body is configured as a through structure. The longitudinal ring balloon is located near the fluid outlet of the cannula body. The longitudinal ring balloon has a channel that runs through it. After the longitudinal ring balloon is inflated, the length of the channel is parallel to the axis of the longitudinal ring balloon. The longitudinal ring balloon is used to contact the inner wall of the femoral artery after inflation. An airbag inlet, which is connected to a longitudinal ring airbag, is used to inflate and deflate the longitudinal ring airbag.

[0007] Preferably, the channel cross-section is set as an arc-shaped structure, the channel is opened on the outer wall of the longitudinal ring airbag, and the spacing between the openings of the channel is equal to the channel diameter.

[0008] Preferably, the channel cross-section is configured as an arc-shaped structure, the channel is opened on the outer wall of the longitudinal ring airbag, the spacing between the openings of the channel is smaller than the channel diameter, and the depth of the channel is greater than the channel radius.

[0009] Preferably, the channel is provided in multiple ways, and the multiple channels fully cover the cannula body at equal angles or partially cover the cannula body at equal angles.

[0010] Preferably, the channel cross-section is set as a circular structure, and the channel passes through the longitudinal ring airbag and connects both sides of the longitudinal ring airbag.

[0011] Preferably, the channel is provided in multiple ways, and the multiple channels fully cover the cannula body at equal angles or partially cover the cannula body at equal angles.

[0012] Preferably, the diameter of the cannula body gradually decreases from the inlet to the outlet, and the outlet has the smallest diameter relative to other parts of the cannula body.

[0013] Preferably, a first guide hole and a second guide hole are symmetrically provided on the side wall of the liquid outlet, the first guide hole facing the longitudinal ring airbag side and the second guide hole facing the side away from the longitudinal ring airbag.

[0014] Preferably, the end of the cannula body away from the outlet is connected to an inlet, and a bulging air bladder is provided at the middle of the outer wall of the cannula body. After the bulging air bladder expands, it restricts the position of the cannula body in the femoral artery.

[0015] Preferably, it also includes a marking line, which is disposed on the side wall of the cannula body and is on the same line as the bulging airbag.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: The invention has a simple overall structure. Through the channel set on the longitudinal ring balloon, the femoral artery blood flow can be maintained through the longitudinal ring balloon to maintain the perfusion of the distal lower limb, and the insertion depth can be positioned through the longitudinal ring balloon. This completely avoids the problem of inconvenient operation of complex insertion structures, and is also less likely to cause blockage or damage. The actual application effect is better. A single catheter placement can meet the blood perfusion needs of the lower limbs, effectively reducing the incidence of lower limb ischemia complications. It is also easy to operate, reducing surgical risks and complexity, as well as trauma to patients. Attached Figure Description

[0017] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts. Wherein: Figure 1 This is a schematic diagram of the structure of an ECMO femoral artery cannula for lower limb blood perfusion according to the present invention; Figure 2 This is a schematic diagram of the upper semi-circular arc-shaped channel of the full-coverage longitudinal ring airbag of the present invention; Figure 3 This is a schematic diagram of the deep arc-shaped channel on the full-coverage longitudinal ring airbag of the present invention; Figure 4 This is a schematic diagram of the deep arc-shaped channel on the semi-covered longitudinal ring airbag of the present invention; Figure 5 This is a schematic diagram of the deep arc-shaped channel on the semi-covered longitudinal ring airbag of the present invention; Figure 6 This is a schematic diagram of the upper semi-circular channel of the full-coverage longitudinal ring airbag of the present invention; Figure 7 This is a schematic diagram of the structure of the semi-circular channel on the upper part of the semi-covered longitudinal ring airbag of the present invention; Figure 8 This is a schematic diagram of the structure of the bulging airbag of the present invention located on the cannula body; Figure 9 This is a schematic diagram of the liquid outlet section of the present invention; Figure 10 This is a schematic diagram of the angle structure between the bulging airbag and the cannula body of the present invention; Figure 11 This is a schematic diagram of the structure when multiple bulging airbags are provided in this invention.

[0018] The diagram shows the following labels: 1. Intubation tube body; 2. Longitudinal ring airbag; 21. Channel; 201. Positioning line; 3. Liquid outlet; 31. First guide hole; 32. Second guide hole; 4. Airbag opening; 5. Liquid inlet; 6. Bulged airbag; 61. Side hole; 7. Marking line. Detailed Implementation

[0019] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention. Example

[0020] like Figure 1 As shown, an ECMO femoral artery cannula for lower limb blood perfusion includes: The cannula body 1 has a liquid outlet 3 at one end and a liquid inlet 5 at the other end. The interior of the cannula body 1 is configured as a through structure. The longitudinal ring airbag 2 is located near the liquid outlet 3 of the cannula body 1. The longitudinal ring airbag 2 has a channel 21 that runs through it. After the longitudinal ring airbag 2 is inflated, the length of the channel 21 is parallel to the axis of the longitudinal ring airbag 2. The longitudinal ring airbag 2 is used to contact the inner wall of the femoral artery after inflation. Airbag opening 4 is connected to longitudinal ring airbag 2 and is used to inflate and deflate longitudinal ring airbag 2.

[0021] The cannula body 1, the outlet 3, and the inlet 5 are designed as a single unit. The longitudinal ring balloon 2 is mounted on the cannula body 1. When the longitudinal ring balloon 2 is not inflated, its volume shrinks and it adheres to the cannula body 1, thus not affecting the insertion of the cannula body 1 into the femoral artery. When the longitudinal ring balloon 2 is inflated, its volume expands, and the outermost wall of the expanded longitudinal ring balloon 2 adheres to the femoral artery. An outlet channel 21 is formed on the expanded longitudinal ring balloon 2, which always connects the blood vessels on both sides of the longitudinal ring balloon 2. Blood delivered to the femoral artery through the cannula body 1 will flow back to the cannula body 1 in the opposite direction through the outlet channel 21, thus avoiding blockage of the femoral artery. This overall structure is simple, and in practical applications, there are no excessive structures, and no collisions between the various structures, which makes the overall structure of the cannula body 1 more stable and improves the practical application effect.

[0022] Specifically, the balloon port 4 on the intubation body 1 is connected to the artificial heart-lung machine. The artificial heart-lung machine delivers blood, which enters the intubation body 1 and is then delivered to the femoral artery. The blood in the femoral artery slowly flows into the femoral artery of the lower limb through the channel 21 on the longitudinal ring balloon 2.

[0023] like Figure 2As shown, the cross-section of channel 21 is set as an arc-shaped structure. Channel 21 is opened on the outer wall of the longitudinal ring airbag 2, and the spacing between the openings of channel 21 is equal to the diameter of channel 21.

[0024] The channel 21 on the longitudinal ring airbag 2 is provided with an arc-shaped structure that is recessed into the longitudinal ring airbag 2. This allows the channel 21 to remain connected as the overall volume of the longitudinal ring airbag 2 expands. The spacing between the openings of the channel 21 is equal to the diameter of the channel 21, which can prevent the femoral artery from completely blocking the channel.

[0025] like Figure 3 As shown, the cross-section of channel 21 is set as an arc-shaped structure. Channel 21 is opened on the outer wall of the longitudinal ring airbag 2. The spacing between the openings of channel 21 is smaller than the diameter of channel 21, and the depth of channel 21 is greater than the radius of channel 21.

[0026] Specifically, when the longitudinal ring airbag 2 is squeezed by the femoral artery, the longitudinal ring airbag 2 deforms, causing the parts on both sides of the channel 21 to deform toward the middle of the channel 21. The maximum degree of deformation is such that the protrusions at both ends of the channel 21 come into contact. This contact method can always keep the channel 21 connected, completely avoiding blockage and ensuring that blood always flows.

[0027] like Figure 4-5 As shown, multiple channels 21 are provided, and multiple channels 21 fully cover the cannula body 1 or partially cover the cannula body 1 at equal angles.

[0028] Among them, the multiple channels 21 fully cover the cannula body 1 at all angles, which allows blood to flow at all angles of the longitudinal ring airbag 2, resulting in better overall flow. The multiple channels 21 partially cover the cannula body 1 at equal angles, which allows blood to flow only on one side of the longitudinal ring airbag 2, while blood can flow on the other side. This method allows the longitudinal ring airbag 2 to be made smaller, thus creating a smaller longitudinal ring airbag 2 suitable for various environments.

[0029] like Figure 6-7 As shown, the cross-section of channel 21 is set as a circular structure, and channel 21 passes through the longitudinal ring airbag 2 and connects the two sides of the longitudinal ring airbag 2.

[0030] Multiple channels 21 are provided, and multiple channels 21 can fully cover the cannula body 1 or partially cover the cannula body 1 at equal angles.

[0031] Specifically, the channel 21 prepared in this way can completely avoid the phenomenon of channel 21 blockage. The overall volume of the longitudinal ring airbag 2 is large, which can be used by users with large femoral arteries. The cannula body 1 with multiple channels 21 at equal angles provides full coverage and can be used to maximize its applicability to users with femoral artery vessels larger than their own, while the cannula body 1 with multiple channels 21 at equal angles provides partial coverage and can be used to users with moderate femoral artery vessels.

[0032] The diameter of the cannula body 1 gradually decreases from the inlet 5 to the outlet 3, and the outlet 3 has the smallest diameter relative to other parts of the cannula body 1.

[0033] like Figure 8 As shown in the diagram, the diameter of the cannula body 1 on the left side of the longitudinal ring balloon 2 is larger than the diameter of the cannula body 1 on the right side of the longitudinal ring balloon 2. This allows the femoral artery space at the fluid outlet 3 to be larger than the femoral artery space on the left side of the longitudinal ring balloon 2. This allows blood from the right side of the femoral artery to pass more smoothly through the channel 21 on the longitudinal ring balloon 2, further preventing the femoral artery from blocking the channel 21 on the longitudinal ring balloon 2, resulting in better practical application effects.

[0034] like Figure 9 As shown, a first guide hole 31 and a second guide hole 32 are symmetrically provided on the side wall of the liquid outlet section 3. The first guide hole 31 faces the longitudinal ring airbag 2, and the second guide hole 32 faces the side away from the longitudinal ring airbag 2.

[0035] Specifically, through the structure of the first guide hole 31 and the second guide hole 32, a portion of the blood discharged from the liquid outlet 3 can be directed towards... Figure 8 The airflow is directed to the left, thus passing quickly through the channel 21 on the longitudinal ring airbag 2.

[0036] A bulging airbag 6 is provided at the middle of the outer wall of the cannula body 1. After the bulging airbag 6 expands, it restricts the position of the cannula body 1 in the femoral artery, thereby restricting the position of the cannula body 1 as a whole and preventing the cannula body 1 from shifting position. Furthermore, the bulging airbag 6 can be configured as one or two. When it is configured as one, it also includes a marking line 7. The marking line 7 is set on the side wall of the cannula body 1. The marking line 7 and the bulging airbag 6 are on the same line, which can serve as a marking function, so that the user can quickly locate the cannula body 1 during use.

[0037] like Figure 11 As shown, when there are two of them, they are symmetrically arranged on the cannula body 1, and the two bulging airbags 6 do not exceed half the height of the cannula body 1 at the position of the bulging airbag 6. In addition, the marking line 7 is set on the opposite side of the symmetrical center line of the two bulging airbags 6, which can serve as a marking function, so that the user can quickly locate the cannula body 1 during use.

[0038] In addition, the bulge airbag 6 can be configured as follows: Figure 10As shown, when the bulging airbag 6 is fully inflated, the side wall of the bulging airbag 6 on the side in contact with the blood vessel wall forms an acute angle with the cannula body 1, while the side wall of the bulging airbag 6 on the side not in contact with the blood vessel wall forms an obtuse angle with the cannula body 1. This shape setting makes the position of the cannula body 1 more stable. When the cannula body 1 is inserted into the femoral artery, the two bulging balloons 6 will abut against the blood vessel wall, forming a side hole 61 between the two bulging balloons 6, which allows blood to flow from the side hole 61 between the two bulging balloons 6 to the inlet 5.

[0039] like Figure 4 , Figure 5 and Figure 7 As shown, when the channel 21 on the longitudinal ring airbag 2 covers half of the longitudinal ring airbag 2, a positioning line 201 is provided on the other half of the longitudinal ring airbag 2 that is not covered. The positioning line 201 is located at the corresponding position of the marking line 7, which can further assist in the positioning of the entire device quickly.

[0040] The inner wall of the cannula body 1 is coated with a heparin coating, which can retain anticoagulant activity and reduce the activation of the coagulation mechanism.

[0041] The insertion method of the cannula body 1 of the present invention is as follows: Guided by the puncture guide, the cannula body 1 is inserted into the femoral artery with the front end of the cannula body 1 facing the proximal end of the femoral artery. The longitudinal ring balloon 2 and the fluid outlet 3 are located inside the femoral artery. The longitudinal ring balloon 2 is inflated through the balloon port 4. The inflated longitudinal ring balloon 2 can help position the cannula body 1 (the specific position can be observed under ultrasound after inflation for easy position confirmation. If it is not suitable, it can be inflated and deflated to adjust the position of the cannula body 1). The inflated longitudinal ring balloon 2 is in contact with the inner wall of the femoral artery. At the same time, the channel 21 remains connected to ensure that the blood infused into the femoral artery through the cannula body 1 can flow smoothly to the distal end of the lower limb. After the catheter is inserted, the puncture guide can be withdrawn and connected to the tubing for blood perfusion.

[0042] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. An ECMO femoral artery cannula for lower limb blood perfusion, characterized in that, include: The cannula body (1) has a liquid outlet (3) at one end and a liquid inlet (5) at the other end. The cannula body (1) has a through structure inside. The longitudinal ring airbag (2) is located near the liquid outlet (3) of the cannula body (1). The longitudinal ring airbag (2) has a channel (21) that runs through it. After the longitudinal ring airbag (2) is inflated, the length direction of the channel (21) is parallel to the axis of the longitudinal ring airbag (2). The longitudinal ring airbag (2) is used to contact the inner wall of the femoral artery after inflation. The airbag opening (4) is connected to the longitudinal ring airbag (2), and the airbag opening (4) is used to inflate and deflate the longitudinal ring airbag (2).

2. The ECMO femoral artery cannula for lower limb blood perfusion according to claim 1, characterized in that: The cross section of the channel (21) is set as an arc structure. The channel (21) is opened on the outer wall of the longitudinal ring airbag (2). The spacing between the openings of the channel (21) is equal to the diameter of the channel (21).

3. The ECMO femoral artery cannula for lower limb blood perfusion according to claim 1, characterized in that: The cross section of the channel (21) is set as an arc structure. The channel (21) is opened on the outer wall of the longitudinal ring airbag (2). The spacing between the openings of the channel (21) is smaller than the diameter of the channel (21). The depth of the channel (21) is greater than the radius of the channel (21).

4. An ECMO femoral artery cannula for lower limb blood perfusion according to claim 2 or 3, characterized in that: The channel (21) is provided in multiple ways, and the multiple channels (21) fully cover the cannula body (1) or partially cover the cannula body (1) at equal angles.

5. The ECMO femoral artery cannula for lower limb blood perfusion according to claim 1, characterized in that: The cross-section of the channel (21) is set as a circular structure, and the channel (21) passes through the longitudinal ring airbag (2) and connects the two sides of the longitudinal ring airbag (2).

6. The ECMO femoral artery cannula for lower limb blood perfusion according to claim 5, characterized in that: The channel (21) is provided in multiple ways, and the multiple channels (21) fully cover the cannula body (1) or partially cover the cannula body (1) at equal angles.

7. The ECMO femoral artery cannula for lower limb blood perfusion according to claim 1, characterized in that: The diameter of the cannula body (1) gradually decreases from the inlet (5) to the outlet (3), and the outlet (3) has the smallest diameter relative to other parts of the cannula body (1).

8. The ECMO femoral artery cannula for lower limb blood perfusion according to claim 7, characterized in that: The liquid outlet (3) has a first guide hole (31) and a second guide hole (32) symmetrically opened on the side wall. The first guide hole (31) faces the longitudinal ring airbag (2) and the second guide hole (32) faces away from the longitudinal ring airbag (2).

9. The ECMO femoral artery cannula for lower limb blood perfusion according to claim 8, characterized in that: The cannula body (1) is connected to an inlet (5) at one end away from the outlet (3). A bulging airbag (6) is provided at the middle of the outer wall of the cannula body (1). After the bulging airbag (6) expands, it restricts the position of the cannula body (1) in the femoral artery.

10. An ECMO femoral artery cannula for lower limb blood perfusion according to claim 6, characterized in that: It also includes a marking line (7), which is set on the side wall of the cannula body (1), and the marking line (7) is on the same line as the bulging airbag (6).

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