An ECMO arterial catheter that can change the direction of perfusion blood flow

Abstract

This invention relates to the field of medical device technology, specifically an ECMO arterial catheter capable of altering the direction of perfusion blood flow. The catheter comprises a tube body with openings at both ends. The right end of the tube body is a pre-flush section, the middle end is a buffer section, and the left end is a perfusion section. The perfusion section includes a central lumen and three side lumens. The central lumen is located in the middle of the inner part of the tube body, and three equally divided septa are located on the outer periphery of the central lumen, dividing the tube body into three side lumens. The inner wall of the left end of each side lumen is a blood flow redirection surface. This invention, by designing the arterial catheter lumen as a central lumen with forward blood flow and three side lumens with redirected blood flow, maximizes the alignment of the blood flow direction in the ECMO arterial catheter with the physiological direction, reduces the adverse effects of ECMO on left ventricular output and damage to the vascular endothelium, and improves hemodynamic stability and safety during VA-ECMO implementation.

Description

Technical Field

[0001] This invention relates to the field of medical supplies technology, and in particular to an ECMO arterial catheter capable of changing the direction of perfusion blood flow. Background Technology

[0002] ECMO (Extracorporeal Membrane Oxygenation) is a limited medical technology used for perioperative oxygenation and blood perfusion maintenance in patients with acute severe cardiopulmonary failure during cardiopulmonary surgery. In VA-ECMO, blood is drawn through a central venous catheter, fully oxygenated by the extracorporeal membrane oxygenator, and then pumped into the aorta via a central arterial catheter, partially replacing cardiopulmonary function. Because the central arterial catheter can typically be placed distally in the trunk, limbs, and cervicothoracic junction (e.g., femoral artery, axillary artery, common carotid artery), the perfusion blood flow direction in a traditional single-lumen arterial catheter is opposite to the physiological blood flow direction of the aorta.

[0003] The purpose of VA-ECMO technology is to establish an extracorporeal oxygenation and perfusion pathway to compensate for systemic hypotension and hypoperfusion caused by low cardiac output. However, traditional single-lumen arterial catheters impede left ventricular output, leading to further left ventricular failure; moreover, the restriction on left ventricular output worsens with increasing ECMO flow rates. Furthermore, the perfusion flow, contrary to physiological blood flow, causes severe hemodynamic disturbances within the aortic arch, including endothelial injury, glycocalyx loss, decreased blood flow velocity, insufficient distal perfusion pressure, erythrocyte destruction, coagulation factor depletion, and cytokine storms, among other adverse complications. Although improving ECMO maintenance techniques can partially reduce the incidence of these complications, no effective solution has yet been found. Therefore, the serious adverse complications associated with VA-ECMO technology limit its ability to improve patient outcomes. Summary of the Invention

[0004] The purpose of this invention is to provide an ECMO arterial catheter that can change the direction of perfusion blood flow. Through the central lumen and three lateral lumens, the perfusion blood can be divided into a central blood flow and three lateral blood flows. After the blood flow direction is changed by the blood flow diversion guide surface, the blood flows out from the blood flow diversion hole and enters the aorta, so that the direction of the lateral blood flow is consistent with the physiological blood flow direction of the aorta. This will effectively solve the various complications of traditional single-lumen arterial catheters.

[0005] The technical solution of the present invention:

[0006] An ECMO arterial catheter capable of changing the direction of perfusion blood flow includes a tube body with openings at both ends, wherein the right end of the tube body is a pre-flush section, the middle end is a buffer section, and the left end is a perfusion section.

[0007] The buffer section includes a central lumen and three side lumens. The central lumen is located at the middle of the inner end of the tube body. The outer periphery of the central lumen has three equally divided partitions, which divide the tube body into three side lumens. The inner wall of the left end of each side lumen is a blood flow diversion guide surface. The outer wall of the tube body is provided with a blood flow diversion hole that matches the guide surface.

[0008] The left end of the central lumen extends to the left end opening of the tube body.

[0009] Furthermore, the outer diameter of the tube gradually decreases from right to left, and the tube core has a conical tip.

[0010] Furthermore, it also includes a die, which includes a main stem, a base plate at the left end of the main stem, a central guide core for filling the central cavity at the middle of the left side surface of the base plate, and three side guide cores for filling the three side cavities in a ring around the left side surface of the base plate outside the central guide core.

[0011] Furthermore, the pre-punching section has a chuck, the main body has a chuck claw that cooperates with the chuck, and the right end of the main body has a hand handle.

[0012] Furthermore, the hand handle, main body, base plate, and central guide core all have channels for the guide wire to pass through.

[0013] Furthermore, the pre-punching section has a side hole, and a sealing cap is detachably threaded onto the side hole.

[0014] The beneficial effects of this invention are:

[0015] This invention designs the arterial catheter lumen as a central lumen with forward blood flow and three lateral lumen with reversed blood flow, thereby maximizing the alignment of the blood flow direction in the ECMO arterial catheter with the physiological direction, reducing the adverse effects of ECMO on left ventricular output and damage to the vascular endothelium, and improving the hemodynamic stability and safety during VA-ECMO implementation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the tube body;

[0018] Figure 3 This is a diagram of the internal structure of the tube.

[0019] Figure 4 This is a cross-sectional view of the buffer section;

[0020] Figure 5 This is a schematic diagram of the structure of the blood flow diversion guide surface;

[0021] Figure 6 This is a schematic diagram of the die structure;

[0022] Figure 7 This is a structural diagram of the central guide core and the side guide cores;

[0023] Figure 8 This is an exploded view of the central guide core and the side guide cores;

[0024] Figure 9 This is a schematic diagram of the sealing screw cap structure. Detailed Implementation

[0025] The invention will now be further described with reference to the accompanying drawings.

[0026] like Figures 1-9 As shown, the present invention provides a first embodiment of an ECMO arterial catheter capable of changing the direction of perfusion blood flow, comprising a tube body 1 with openings at both ends, wherein the right end of the tube body 1 is a pre-flush section 3, the middle end is a buffer section 4, and the left end is a perfusion section 7.

[0027] The buffer section 4 includes a central lumen 41 and three side lumens 42. The central lumen 41 is located at the middle of the inner end of the tube body 1. The outer periphery of the central lumen 41 has three equally divided partitions 43, which divide the tube body 1 into three side lumens 42. The inner wall of the left end of each side lumen 42 is a blood flow diversion guide surface 44. A blood flow diversion hole 45 that matches the guide surface is provided on the outer wall of the tube body 1.

[0028] The left end of the central lumen 41 extends to the left end opening of the tube body 1.

[0029] After the cannula 1 is inserted into the artery, its right end is exposed. It is then connected to the ECMO tubing for blood perfusion. During perfusion, the blood enters the buffer section 4 from the pre-filling section and is divided into a central blood flow and three lateral blood flows. The central blood flow enters the central lumen 41, and the three lateral blood flows enter the three lateral lumen 42. The central blood flow enters the blood vessel through the opening at the left end of the cannula 1, and the direction of the central blood flow is opposite to the direction of blood flow in the blood vessel. After the lateral blood flow enters the lateral lumen 42, its direction is changed by the blood flow diversion guide surface 44, and it flows out through the blood flow diversion hole 45 into the aorta. At this time, because the blood flow diversion guide surface 44 changes the direction of the lateral blood flow, the direction of the lateral blood flow is consistent with the physiological blood flow direction of the aorta, thereby reducing the adverse effects of VA-ECMO on left ventricular output and damage to the vascular endothelium.

[0030] Based on the first embodiment, this invention provides a second embodiment of an ECMO arterial catheter capable of altering the direction of perfusion blood flow. The outer diameter of the catheter body 1 gradually decreases from right to left, and the internal lumens also decrease accordingly. This allows the catheter body 1 to be smoothly inserted into the artery.

[0031] It also includes a filling-type core 5 that matches the tube body 1. The core 5 includes a main stem 51. The left end of the main stem 51 has a base plate 52. The middle of the left side surface of the base plate 52 has a central guide core 53 for filling the central cavity 41. The left side surface of the base plate 52, located outside the central guide core 53, has three side guide cores 54 for filling the three side cavities 42. The left end of the central guide core 53 extends beyond the tube body 1 and gradually tapers forward to a conical tip.

[0032] Insert the core 5 into the tube body 1, so that the part 2 of the core 5 extending beyond the tube body 1 protrudes from the left end opening of the tube body 1 and is integrally formed with the tube body 1 to form a vascular stoma dilator; so that the central guide core 53 fills the central lumen 41 and the side guide core 54 fills the side lumen 42, preventing blood from spraying out from the side lumen 42 during the catheter placement process.

[0033] Based on the second embodiment, this invention provides a third embodiment of an ECMO arterial catheter capable of changing the direction of perfusion blood flow. The pre-flush section 3 has a chuck 31, and the main trunk 51 has claws 55 that cooperate with the chuck 31. Under normal circumstances, the claws 55 are tilted towards the main trunk 51. During the insertion of the core 5 into the catheter body 1, the claws 55 are pulled away from the main trunk 51, causing deformation. After the core 5 is inserted into the catheter body 1, the claws 55 are released, and due to a reset action, they return to their original position towards the main trunk 51, locking onto the chuck 31 and preventing separation of the core 5 from the catheter body 1 during insertion.

[0034] The right end of the main trunk 51 has a handle 56 for easy handling by medical staff.

[0035] Based on the third embodiment, the present invention provides a fourth embodiment of an ECMO arterial catheter that can change the direction of perfusion blood flow. The hand handle 56, main trunk 51, base plate 52, and central guide core 53 all have channels 57 for the guide wire 6 to pass through. The guide wire 6 is an ultra-slippery loach guide wire 6.

[0036] The guidewire 6 can play a guiding role during the insertion of the cannula 1 into the artery.

[0037] Based on any of the above embodiments, the present invention provides a fifth embodiment of an ECMO arterial catheter capable of changing the direction of perfusion blood flow, wherein the pre-filling section 3 has a side hole 32 for pre-filling, venting, and collateral shunt.

[0038] A sealing cap 33 is detachably threaded onto the side hole 32, which allows the side hole 32 to be opened and closed.

[0039] The above description is only a preferred embodiment of the present invention and should not be construed as a limitation of this application. All equivalent changes and modifications made in accordance with the scope of the patent application of the present invention should be covered by the present invention.

Claims

1. An ECMO arterial catheter capable of altering the direction of perfusion blood flow, comprising a tube body with openings at both ends, characterized in that, The right end of the tube is a pre-flushing section, the middle end is a buffer section, and the left end is a perfusion section. The buffer section includes a central lumen and three side lumens. The central lumen is located in the middle of the inner part of the tube. The outer periphery of the central lumen has three equally divided partitions, which divide the tube into three side lumens. The inner wall of the left end of each side lumen is a blood flow diversion guide surface. The outer wall of the tube has blood flow diversion holes that cooperate with the guide surface. The left end of the central lumen extends to the left end opening of the tube. The outer diameter of the tube gradually decreases from right to left; It also includes a die with a conical tip. The die includes a main stem, a base plate at the left end of the main stem, a central guide for filling the central cavity at the middle of the left side surface of the base plate, and three side guides for filling the three side cavities in a ring around the left side surface of the base plate outside the central guide.

2. The ECMO arterial catheter capable of changing the direction of perfusion blood flow according to claim 1, characterized in that, The pre-punching section has a chuck, and the main body has chuck claws that cooperate with the chuck; the right end of the main body has a hand handle.

3. An ECMO arterial catheter capable of changing the direction of perfusion blood flow according to claim 2, characterized in that, The hand handle, main body, base plate, and central guide all have channels for the guidewire to pass through.

4. An ECMO arterial catheter capable of changing the direction of perfusion blood flow according to claim 1, characterized in that, The pre-punching section has a side hole; a sealing cap is detachably threaded onto the side hole.

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