A perfusion tube-free grooved VA-ECMO arterial cannula and implantation method

Abstract

The present application relates to the technical field of medical devices, in particular to a recess type VA-ECMO arterial cannula without perfusion tube and implantation method. The present application comprises a cannula body, the outer part of the cannula body is provided with a fixing mechanism, one end of the cannula body close to the fixing mechanism is provided with a liquid outlet mechanism, the outer part of the cannula body is provided with a gasbag port, the gasbag port inflates and deflates the fixing mechanism, one end of the cannula body away from the liquid outlet mechanism is provided with a liquid injection port, the inner part of the cannula body is provided with a through structure, one end of the cannula body is provided with a balloon placement site, the fixing mechanism comprises an annular fixing part, and the annular fixing part is arranged on the outer part of the cannula body. The problem that the conventional recess type VA-ECMO arterial cannula without perfusion tube is not integrated with a controllable opening and closing flow channel, so that after the cannula is implanted, the arterial trunk blood flow cannot realize natural perfusion to the distal limb, and it is difficult to guarantee the basic blood supply demand of the distal limb of the cannula.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a grooved VA-ECMO arterial cannula and insertion method that eliminates the need for infusion cannula placement. Background Technology

[0002] Venous-arterial extracorporeal membrane oxygenation (VA-ECMO), as a core technology of mechanical circulatory support, has become a key life-saving method for patients with acute circulatory failure such as cardiogenic shock and cardiac arrest. Its core principle is to establish extracorporeal circulation through arterial and venous cannulation, drain the patient's venous blood to the extracorporeal oxygenator to complete gas exchange, and then re-perfuse it back into the body through arterial cannulation, replacing part of the cardiopulmonary function and leaving valuable time for the patient's myocardial recovery and revascularization.

[0003] In the existing technology, the grooved VA-ECMO arterial cannula without perfusion cannula is not integrated with a flow channel that can be controlled to open and close. As a result, after the cannula is inserted, the main arterial blood flow cannot achieve natural perfusion to the distal limb, making it difficult to guarantee the basic blood supply needs of the distal limb. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing grooved VA-ECMO arterial cannulas that do not require perfusion cannula placement, which lack an integrated, controllable flow channel. This results in the inability of the main arterial blood flow to naturally perfuse the distal limbs after cannula placement, making it difficult to guarantee the basic blood supply needs of the distal limbs. Therefore, this invention proposes a grooved VA-ECMO arterial cannula that does not require perfusion cannula placement and its placement method.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a grooved VA-ECMO arterial cannula without perfusion cannula and an insertion method thereof, comprising a cannula body, a fixing mechanism on the outside of the cannula body, a fluid outlet mechanism at one end of the cannula body near the fixing mechanism, a balloon port on the outside of the cannula body, the balloon port being inflated and deflated to the fixing mechanism, an injection port at one end of the cannula body away from the fluid outlet mechanism, a through structure inside the cannula body, and a balloon placement area at one end of the cannula body.

[0006] Preferably, the fixing mechanism includes an annular fixing member, which is disposed outside the cannula body. A flow groove is formed on the outside of the annular fixing member. The cross-section of the flow groove is set as an arc structure. An opening and closing airbag is provided inside the flow groove. The flow groove is adapted to the inflation range of the opening and closing airbag. After the opening and closing airbag is inflated, it completely fits the flow groove.

[0007] Preferably, the fixing mechanism includes an annular assembly, which is disposed outside the cannula body. An arc-shaped groove is formed on the outside of the annular assembly, the cross-section of the arc-shaped groove is set as an arc structure, and an arc-shaped airbag is provided inside the arc-shaped groove.

[0008] Preferably, the fixing mechanism includes an annular mounting member, which is disposed outside the cannula body. A rectangular groove is formed on the outside of the annular mounting member, the cross-section of the rectangular groove is set as a rectangular structure, and a rectangular airbag is provided inside the rectangular groove.

[0009] Preferably, the fixing mechanism includes an annular adapter, which is disposed outside the cannula body. A trapezoidal groove is formed on the outside of the annular adapter, the cross-section of the trapezoidal groove is set as a trapezoidal structure, and a trapezoidal airbag is provided inside the trapezoidal groove.

[0010] Preferably, the fixing mechanism includes an annular connector, which is disposed outside the cannula body. An elliptical groove is formed on the outside of the annular connector, the cross-section of the elliptical groove is set as an arc structure, and an elliptical airbag is provided inside the elliptical groove.

[0011] Preferably, the liquid dispensing mechanism includes a liquid dispensing head, which is disposed at one end of the insertion tube body, and the liquid dispensing head has a plurality of liquid dispensing holes on its exterior.

[0012] Preferably, the outside of the cannula body is provided with marking lines.

[0013] Preferably, the outside of the cannula body is provided with a bulging airbag.

[0014] A method for inserting a grooved VA-ECMO arterial cannula without the need for infusion cannula placement, the specific steps of which are as follows:

[0015] S1: Based on the patient's artery diameter and condition, select the appropriate cannula body model, insert the end of the cannula body equipped with the fluid dispensing mechanism into the artery, and advance it forward. By observing the marking lines on the cannula body, accurately deliver the fluid dispensing head and its side fluid dispensing hole to the target position, and ensure that the annular fixing section with the integrated fixing mechanism is completely located within the arterial lumen;

[0016] S2: After the cannula body is in place, before the opening and closing airbag of the fixation mechanism is inflated, the opening and closing airbag is deflated and stored in the flow groove of the annular fixation component, and the flow groove remains open. Arterial blood flow can partially flow naturally to the distal limb through this open flow groove, providing basic blood flow supply to the distal limb;

[0017] S3: After the cuff is fully inflated through the opening, the flow channel is completely sealed. The opening of the flow channel before the cuff is inflated temporarily maintains blood flow to the distal limb, thus protecting the distal limb. At the same time, the bulging cuff needs to be inflated to seal the puncture site and prevent bleeding.

[0018] In summary, the beneficial effects of the present invention are as follows:

[0019] In this invention, a fixing mechanism is used to expand or deflate the opening and closing airbag when the flow channel needs to be opened or closed, thereby opening or closing the flow channel. This fixing mechanism solves the problem that traditional non-perfusion catheter-free groove-type VA-ECMO arterial cannulas do not integrate a controllable opening and closing flow channel, which prevents the main arterial blood flow from naturally perfusing to the distal limb after cannulation, making it difficult to guarantee the basic blood supply needs of the distal limb. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0021] Figure 2 This is a schematic diagram of the fixed structure of the present invention;

[0022] Figure 3 This is a schematic diagram of the arc-shaped groove structure of the fixing structure of the present invention;

[0023] Figure 4 This is a schematic diagram of the rectangular groove structure of the fixed structure of the present invention;

[0024] Figure 5 This is a schematic diagram of the trapezoidal groove structure of the fixed structure of the present invention;

[0025] Figure 6 This is a schematic diagram of the elliptical groove structure of the fixed structure of the present invention;

[0026] Figure 7 This is a schematic diagram of the liquid outlet structure of the present invention.

[0027] Legend: 1. Cannula body; 2. Fixing mechanism; 201. Annular fixing component; 202. Opening and closing airbag; 203. Flow groove; 204. Annular assembly; 205. Arc-shaped airbag; 206. Arc-shaped groove; 207. Annular mounting component; 208. Rectangular airbag; 209. Rectangular groove; 210. Annular adapter; 211. Trapezoidal airbag; 212. Trapezoidal groove; 213. Annular connector; 214. Elliptical airbag; 215. Elliptical groove; 3. Liquid dispensing mechanism; 31. Liquid dispensing head; 32. Liquid dispensing hole; 4. Airbag inlet; 5. Injection port; 6. Bulbous airbag; 7. Marking line; 8. Balloon placement area. Detailed Implementation

[0028] Example

[0029] Reference Figure 1 and Figure 2 As shown, the present invention provides a technical solution: a grooved VA-ECMO arterial cannula without perfusion cannula placement and its insertion method, comprising a cannula body 1, a fixing mechanism 2 on the outside of the cannula body 1, a fluid outlet mechanism 3 at one end of the cannula body 1 near the fixing mechanism 2, a balloon port 4 on the outside of the cannula body 1 for inflating and deflating the fixing mechanism 2, an injection port 5 at one end of the cannula body 1 away from the fluid outlet mechanism 3, a through structure inside the cannula body 1, and a balloon placement area 8 at one end of the cannula body 1. The fixing mechanism 2 includes an annular fixing member 201, which is disposed outside the cannula body 1. A flow groove 203 is formed on the outside of the annular fixing member 201, the cross-section of the flow groove 203 is an arc structure, and an opening and closing balloon 202 is provided inside the flow groove 203. The flow groove 203 is adapted to the inflation range of the opening and closing balloon 202, and the opening and closing balloon 202 completely fits the flow groove 203 after inflation.

[0030] The opening and closing airbag 202 expands only in the direction of the flow channel 203. After inflation, it can completely seal the flow channel 203, achieving precise closure of the flow channel. After deflation, it can not block the flow channel 203, ensuring the natural perfusion of arterial blood to the distal limbs. At the same time, it avoids the opening and closing airbag 202 from bulging and damaging blood vessels. It has high sealing reliability and smooth opening and closing switching.

[0031] Reference Figure 3 As shown, the fixing mechanism 2 includes an annular assembly 204, which is disposed outside the cannula body 1. An arc-shaped groove 206 is provided on the outside of the annular assembly 204. The cross-section of the arc-shaped groove 206 is set as an arc structure, and an arc-shaped airbag 205 is provided inside the arc-shaped groove 206.

[0032] The arc-shaped groove 206 is adapted to the shape of the arc-shaped airbag 205. The arc-shaped airbag 205 expands only into the arc-shaped groove 206. After inflation, it fits tightly and is sealed without gaps, which not only ensures the basic blood supply to the distal limb, but also avoids the arc-shaped airbag 205 from squeezing the blood vessels. At the same time, the arc-shaped structure adapts to the inner wall of the blood vessels, reducing the risk of blood vessel damage.

[0033] Reference Figure 4 As shown, the fixing mechanism 2 includes an annular mounting member 207, which is disposed outside the cannula body 1. A rectangular groove 209 is provided on the outside of the annular mounting member 207. The cross-section of the rectangular groove 209 is set as a rectangular structure, and a rectangular airbag 208 is provided inside the rectangular groove 209.

[0034] The rectangular groove 209 has a regular structure and fits the rectangular airbag 208 very well. The rectangular airbag 208 expands only into the rectangular groove 209. After inflation, the force is even and the sealing area is large, which can effectively prevent blood leakage and ensure the reliability of channel closure. The rectangular structure is easy to process and manufacture. The rectangular airbag 208 does not shift after expansion. The rectangular groove 209 can provide a stable blood flow channel, reduce blood flow resistance, and ensure sufficient blood supply to the distal limbs.

[0035] Reference Figure 5 As shown, the fixing mechanism 2 includes an annular adapter 210, which is disposed outside the cannula body 1. A trapezoidal groove 212 is provided on the outside of the annular adapter 210. The cross-section of the trapezoidal groove 212 is set as a trapezoidal structure, and a trapezoidal airbag 211 is provided inside the trapezoidal groove 212.

[0036] The trapezoidal groove 212 serves as a guide, directing the trapezoidal airbag 211 to expand precisely towards the groove, preventing the airbag 211 from shifting. Simultaneously, the inclined surface of the trapezoidal structure enhances the fit and sealing between the airbag 211 and the trapezoidal groove 212, preventing the airbag 211 from falling off after inflation. The larger end of the trapezoidal groove 212 faces the inner wall of the blood vessel, increasing the blood flow area, reducing blood flow resistance, ensuring the efficiency of blood supply to the distal limbs, and not affecting the smooth flow of blood within the blood vessels.

[0037] Reference Figure 6 As shown, the fixing mechanism 2 includes an annular connector 213, which is disposed outside the cannula body 1. An elliptical groove 215 is provided on the outside of the annular connector 213. The cross-section of the elliptical groove 215 is set as an arc structure. An elliptical airbag 214 is provided inside the elliptical groove 215.

[0038] Among them, the elliptical groove 215 combines the smoothness of the arc structure and the stability of the rectangular structure, adapts to the flow direction of arterial blood flow, and reduces blood flow eddies. The elliptical airbag 214 is precisely adapted to the elliptical groove 215, and expands only in the direction of the elliptical groove 215. After inflation, it is tightly sealed, and after deflation, it does not obstruct the blood flow channel.

[0039] Reference Figure 7 As shown, the liquid dispensing mechanism 3 includes a liquid dispensing head 31, which is located at one end of the insertion tube body 1. Several liquid dispensing holes 32 are opened on the outside of the liquid dispensing head 31.

[0040] Among them, several outlet holes 32 are evenly distributed, which can make oxygenated blood evenly reinfused into the arterial system.

[0041] Reference Figure 1 As shown, the outside of the cannula body 1 is marked with a marking line 7.

[0042] Among them, the marking line 7 can accurately indicate the insertion depth of the cannula body 1, improving the convenience and accuracy of cannulation operation.

[0043] Reference Figure 1 As shown, the external part of the cannula body 1 is provided with a bulging airbag 6.

[0044] Among them, the bulging airbag 6 can help fix the position of the cannula body 1, prevent the cannula body 1 from shifting in the blood vessel, and further improve the safety and reliability of the cannula body 1.

[0045] Working principle: Using the fixing mechanism 2, when it is necessary to open or close the flow channel 203, first select the appropriate cannula body 1 model according to the patient's artery diameter and condition. Insert the end of the cannula body 1 equipped with the fluid dispensing mechanism 3 into the artery and advance it forward. By observing the marking line 7 on the cannula body 1, accurately deliver the fluid dispensing head 31 and its side fluid dispensing hole 32 to the target position, ensuring that the annular fixing member 201 is completely located within the arterial lumen. After the cannula body 1 is in place, before the opening / closing balloon 202 is inflated, the opening / closing balloon 202 is deflated and stored within the flow channel 203 of the annular fixing member 201. The flow channel 203 remains open, allowing arterial blood flow to partially pass through this open channel. The channel 203 flows naturally to the distal limb, providing basic blood flow. After the balloon 202 is inflated through the balloon port 4, the channel 203 is completely closed. The opening of the channel 203 before the balloon 202 is inflated is used to temporarily maintain blood flow to the distal limb, thus protecting the distal limb. At the same time, the bulging balloon 6 needs to be inflated to seal the puncture point and prevent bleeding. Through the fixation mechanism, the problem of traditional groove-type VA-ECMO arterial cannulas without perfusion cannulas not integrating a controllable opening and closing flow channel is solved. This makes it difficult to ensure the basic blood supply needs of the distal limb after cannulation because the main arterial blood flow cannot be naturally perfused to the distal limb.

[0046] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 mechanical connection or an electrical 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 will understand the specific meaning of the above terms in this invention based on the specific circumstances.

Claims

1. A grooved VA-ECMO arterial cannula that eliminates the need for perfusion cannulation, comprising a cannula body (1), characterized in that: The external part of the cannula body (1) is provided with a fixing mechanism (2), the end of the cannula body (1) near the fixing mechanism (2) is provided with a liquid outlet mechanism (3), the external part of the cannula body (1) is provided with an air bladder port (4), the air bladder port (4) inflates and deflates the fixing mechanism (2), the end of the cannula body (1) away from the liquid outlet mechanism (3) is provided with an injection port (5), the internal part of the cannula body (1) is configured as a through structure, and one end of the cannula body (1) is provided with a balloon placement area (8).

2. The grooved VA-ECMO arterial cannula without perfusion cannulation according to claim 1, characterized in that: The fixing mechanism (2) includes an annular fixing member (201), which is disposed outside the cannula body (1). A flow groove (203) is provided on the outside of the annular fixing member (201). The cross-section of the flow groove (203) is set as an arc structure. An opening and closing airbag (202) is provided inside the flow groove (203). The flow groove (203) is adapted to the inflation range of the opening and closing airbag (202). After the opening and closing airbag (202) is inflated, it completely fits the flow groove (203).

3. The grooved VA-ECMO arterial cannula without perfusion cannulation according to claim 2, characterized in that: The fixing mechanism (2) includes an annular fitting (204), which is disposed outside the cannula body (1). An arc groove (206) is provided on the outside of the annular fitting (204), and the cross section of the arc groove (206) is set as an arc structure. An arc airbag (205) is provided inside the arc groove (206).

4. The grooved VA-ECMO arterial cannula without perfusion cannulation according to claim 2, characterized in that: The fixing mechanism (2) includes an annular mounting component (207), which is disposed outside the cannula body (1). A rectangular groove (209) is provided on the outside of the annular mounting component (207), and the cross-section of the rectangular groove (209) is set as a rectangular structure. A rectangular airbag (208) is provided inside the rectangular groove (209).

5. A grooved VA-ECMO arterial cannula without perfusion cannulation according to claim 2, characterized in that: The fixing mechanism (2) includes an annular adapter (210), which is disposed outside the cannula body (1). A trapezoidal groove (212) is provided on the outside of the annular adapter (210). The cross section of the trapezoidal groove (212) is set as a trapezoidal structure. A trapezoidal airbag (211) is provided inside the trapezoidal groove (212).

6. The grooved VA-ECMO arterial cannula without perfusion cannulation according to claim 2, characterized in that: The fixing mechanism (2) includes an annular connector (213), which is disposed outside the cannula body (1). An elliptical groove (215) is provided on the outside of the annular connector (213). The cross section of the elliptical groove (215) is set as an arc structure. An elliptical airbag (214) is provided inside the elliptical groove (215).

7. The grooved VA-ECMO arterial cannula without perfusion cannula according to claim 1, characterized in that: The liquid outlet mechanism (3) includes a liquid outlet head (31), which is located at one end of the insertion tube body (1), and a plurality of liquid outlet holes (32) are provided on the outside of the liquid outlet head (31).

8. The grooved VA-ECMO arterial cannula without perfusion cannulation according to claim 7, characterized in that: The cannula body (1) is provided with a marking line (7) on its exterior.

9. A grooved VA-ECMO arterial cannula without perfusion cannulation according to claim 8, characterized in that: The cannula body (1) is provided with a bulging airbag (6) on its outside.

10. A method for inserting a grooved VA-ECMO arterial cannula without the need for infusion cannula placement, characterized in that: The specific steps are as follows: S1: Select the appropriate model of the cannula body (1) according to the diameter of the patient's artery and condition. Insert the end of the cannula body (1) with the liquid outlet mechanism (3) into the artery and push it forward. By observing the marking line (7) on the cannula body (1), accurately deliver the liquid outlet head (31) and its side liquid outlet hole (32) to the target position, and ensure that the annular fixing part (201) section with the fixing mechanism (2) is completely located in the arterial lumen. S2: After the cannula body (1) is in place, before the opening and closing airbag (202) of the fixation mechanism (2) is inflated, the opening and closing airbag (202) is deflated and stored in the flow groove (203) of the annular fixation member (201). The flow groove (203) remains open, and arterial blood flow can partially flow naturally to the distal limb through this open flow groove (203) to provide basic blood flow supply to the distal limb. S3: After the opening and closing airbag (202) is fully expanded through the airbag opening (4), the channel of the flow groove (203) is completely closed. The opening of the flow groove (203) before the opening and closing airbag (202) is inflated is used to temporarily maintain the blood flow to the distal limb and protect the distal limb. At the same time, the bulging airbag (6) needs to be inflated to block the puncture point and prevent bleeding.

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