A left atrial pigtail catheter for ECMO with head-end protection function

Abstract

The present invention relates to the field of medical device technology, and more particularly to a left atrial pigtail catheter for ECMO with a head-end protection function. The catheter comprises a catheter, a dilator inserted within the catheter, a guidewire inserted within the dilator, a flow guide portion at the proximal end of the catheter, and a support portion embedded in the catheter sidewall. The present invention can effectively prevent complications such as left ventricular bulge and pulmonary edema, and reduce the risk of accidents such as atrial perforation.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to an ECMO left atrial pigtail catheter with a head end protection function. Background Art

[0002] Extracorporeal membrane oxygenation (ECMO) is primarily used clinically to support cardiac and / or respiratory insufficiency and is a key technology for saving patients' lives and prolonging survival. ECMO operates by draining venous blood from the patient, then oxygenating and removing carbon dioxide externally through a device. The blood, having undergone gas exchange, is then pumped back into the patient. Depending on the mode of operation, it is categorized as either VA ECMO (venous drainage with arterial return) or VV ECMO (venous drainage and infusion). VA ECMO is often used clinically for cardiopulmonary support in the treatment of circulatory failure, such as cardiogenic shock. While venous drainage via the right atrium or superior and inferior vena cava reduces right ventricular preload, retrograde perfusion from central or peripheral arteries may increase left ventricular afterload, thereby increasing left ventricular ejection resistance, leading to left ventricular dilation and elevated left atrial pressure. This can easily lead to left cardiac thrombosis and pulmonary edema, compromising left ventricular function recovery. To address these complications, ECMO combined with additional treatments such as IABP, surgical atrial septostomy, and Impella can reduce elevated left ventricular pressure. However, this comes with the complexity of secondary left ventricular decompression surgery, increased difficulty, and increased cost. Therefore, a left atrial pigtail catheter with tip protection for ECMO is urgently needed. Summary of the Invention

[0003] The purpose of the present invention is to provide a left atrial pigtail catheter for ECMO with a head end protection function to solve the above problems, effectively prevent complications such as left ventricular bulge and pulmonary edema, and reduce the occurrence of accidents such as atrial perforation.

[0004] To achieve the above-mentioned objectives, the present invention provides the following solution: a left atrial pigtail catheter for ECMO with a head end protection function, comprising a catheter, a dilator passing through the catheter, a guide wire passing through the dilator, a guide portion provided at the proximal end of the catheter, and a support portion embedded in the side wall of the catheter.

[0005] Preferably, the catheter is a flexible tube, and the proximal end of the catheter is a pigtail structure.

[0006] Preferably, the guide portion includes a plurality of guide holes provided at the proximal end of the catheter, and the guide holes penetrate through the side wall of the catheter.

[0007] Preferably, the support portion includes a metal wire, the metal wire is a spiral structure, and the metal wire is embedded in the side wall of the catheter.

[0008] Preferably, the expander is made of a hard material, the interior of the expander is hollow, and the proximal end of the expander is arranged beyond the proximal end of the catheter.

[0009] Preferably, the unfolded length of the pigtail structure is 5-15 cm.

[0010] Preferably, the guide wire is made of stainless steel.

[0011] The present invention has the following technical effects: a dilator is inserted into the interior of a catheter, and then a guidewire is inserted into the interior of the dilator. The three simultaneously enter human tissue, enter the patient's vena cava through the atrial septum, and enter the atrium, directly draining venous blood. The structure of the present application has the effect of reducing left cardiac system pressure, reducing ventricular expansion, reducing tissue damage such as atrial perforation, and preventing complications such as thrombosis caused by blood stasis. It is simple to operate, has excellent blood drainage effect, and is suitable for clinical application. The present invention can achieve left cardiac pressure relief, prevent complications such as left cardiac dilatation, left ventricular expansion, and pulmonary edema, while having a high safety factor and avoiding atrial perforation. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0013] Figure 1 It is a schematic diagram of the structure of the present invention;

[0014] Figure 2 For the present invention Figure 1 A partial enlarged view of the middle part;

[0015] Figure 3 This is a schematic diagram of the proximal end structure of the catheter and dilator of the present invention;

[0016] Figure 4 This is a structural diagram of embodiment 2 of the present invention;

[0017] Figure 5 For the present invention Figure 4 A partial enlarged view of point B in the middle;

[0018] Among them, 1. guide wire; 2. catheter; 3. metal wire; 4. diversion hole; 5. expander; 6. snap-in piece; 7. snap-in groove. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Example 1

[0022] Reference Figure 1-3 This embodiment provides a left atrial pigtail catheter for ECMO with a head end protection function, including a catheter 2, a dilator 5 is inserted into the catheter 2, a guide wire 1 is inserted into the dilator 5, a guide portion is provided at the proximal end of the catheter 2, and a support portion is embedded in the side wall of the catheter 2.

[0023] Insert the dilator 5 into the interior of the catheter 2, and then insert the guide wire 1 into the dilator 5. The three enter the human tissue at the same time, enter from the patient's heart vena cava, pass through the atrial septum and enter the atrium, and directly draw out the venous blood. The dilator 5 is used to increase the supporting force, which is convenient for the catheter 2 to be inserted into the patient's body. The structure of the present application has the effect of reducing the pressure of the left heart system, reducing ventricular expansion, reducing atrial perforation and other tissue damage, and preventing complications such as thrombosis caused by blood stasis. It is easy to operate, has a good blood drainage effect, and is suitable for clinical application.

[0024] In a further optimized solution, catheter 2 is a flexible tube with a pigtail-shaped proximal end. Catheter 2 can be made of polyurethane. When unstressed, the proximal end of catheter 2 maintains a pigtail-shaped structure, providing elasticity and allowing the proximal end of catheter 2 to be straightened. Once the entire device has entered the patient's heart, dilator 5 and guidewire 1 are withdrawn, freeing catheter 2 from support by dilator 5. The proximal end of catheter 2 returns to its pigtail-shaped structure, preventing it from puncturing heart tissue.

[0025] In a further optimized solution, the diversion portion includes a plurality of diversion holes 4 provided at the proximal end of the catheter 2. The diversion holes 4 penetrate the side wall of the catheter 2. Blood in the heart enters the catheter 2 through the diversion holes 4 and the opening at the proximal end of the catheter 2, and the diversion holes 4 serve to accelerate blood drainage.

[0026] In a further optimized solution, the support portion includes a metal wire 3 having a spiral structure and embedded in the side wall of the catheter 2. The metal wire 3 can support the catheter 2 and prevent the catheter 2 from being flattened.

[0027] In a further optimized solution, the dilator 5 is made of a hard material, is hollow inside, and has a proximal end extending beyond the proximal end of the catheter 2. The proximal end of the dilator 5 is a sharpened structure to facilitate puncturing the atrial septum.

[0028] After further optimization, the unfolded length of the pigtail structure is 5-15 cm.

[0029] To further optimize the solution, the guide wire 1 is made of stainless steel.

[0030] The working process of this embodiment is as follows: the dilator 5 is inserted into the interior of the catheter 2, and then the guide wire 1 is inserted into the interior of the dilator 5. The three enter the human tissue at the same time, entering from the patient's heart vena cava, and the tip is placed through the dilator 5 through the atrial septum and into the atrium. Then the dilator 5 and the guide wire 1 are pulled out, and the catheter 2 is no longer supported by the dilator 5. The proximal end of the catheter 2 returns to a pigtail structure to prevent the proximal end of the catheter 2 from piercing the heart tissue, and the venous blood is directly drawn out through the diversion hole 4 and the opening of the proximal end of the catheter 2.

[0031] Example 2

[0032] Reference Figure 4-5 The only difference between this embodiment and Example 1 is that several clips 6 are fixedly attached to the outer wall of the dilator 5, and several clip grooves 7 are defined on the inner wall of the catheter 2. The clips 6 match the shape of the clip grooves 7 and are arranged at an angle, with the clips 6 facing the proximal end of the dilator 5. During insertion of the dilator 5 and the catheter 2 into the human body, there is a risk of misalignment between the dilator 5 and the catheter 2, causing the dilator 5 to extend too far beyond the end of the catheter 2, making it difficult to control the distance the catheter 2 enters the heart chamber. By inserting the clips 6 of this embodiment into the clip grooves 7, the dilator 5 and the catheter 2 are prevented from sliding relative to each other during insertion. Furthermore, when the dilator 5 is withdrawn from the catheter 2, the catheter 2 does not restrict its movement.

[0033] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0034] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A left atrial pigtail catheter for ECMO with a tip protection function, characterized by: The invention comprises a catheter (2), wherein a dilator (5) is inserted into the catheter (2), a guide wire (1) is inserted into the dilator (5), a guide portion is provided at the proximal end of the catheter (2), and a support portion is embedded in the side wall of the catheter (2); The catheter (2) is a flexible tube, and the proximal end of the catheter (2) is a pigtail structure; The pigtail structure has an unfolded length of 5-15 cm; The outer wall of the expander (5) is fixedly connected with a plurality of clamping pieces (6), and the inner wall of the catheter (2) is provided with a plurality of clamping grooves (7). The clamping pieces (6) match the shapes of the clamping grooves (7). The clamping pieces (6) and the clamping grooves (7) are arranged obliquely. The clamping piece (6) faces the proximal end of the expander (5) and is inserted into the clamping groove (7) through the clamping piece (6), so as to prevent the expander (5) and the catheter (2) from sliding relative to each other during the process of entering the human body. At the same time, when the expander (5) is withdrawn from the catheter (2), the catheter (2) will not restrict the movement of the expander (5); The flow guide portion comprises a plurality of flow guide holes (4) provided at the proximal end of the conduit (2), wherein the flow guide holes (4) penetrate the side wall of the conduit (2); The support portion comprises a metal wire (3), the metal wire (3) is a spiral structure, and the metal wire (3) is embedded in the side wall of the catheter (2); The expander (5) is made of a hard material, the interior of the expander (5) is hollow, and the proximal end of the expander (5) is arranged beyond the proximal end of the catheter (2); The guide wire (1) is made of stainless steel; The expander (5) is inserted into the interior of the catheter (2), and then the guide wire (1) is inserted into the interior of the expander (5). The three are simultaneously transported into human tissue, enter the patient's heart vena cava, pass through the atrial septum through the tip of the expander (5) and enter the atrium. Then the expander (5) and the guide wire (1) are withdrawn, and the catheter (2) is no longer supported by the expander (5). The proximal end of the catheter (2) returns to a pigtail structure, thereby preventing the proximal end of the catheter from puncturing the heart tissue, and directly leading out venous blood through the diversion hole (4) and the opening of the proximal end of the catheter (2).

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