A temporary pacing catheter with barbs for securing electrodes

Abstract

This invention discloses a temporary pacing catheter with barbs for fixing electrodes, comprising a catheter body, an end electrode, and a ring electrode. The catheter body has a catheter lumen, and the end electrode is provided with a positioning element having a pre-fabricated hook-shaped structure and shape memory function. A sheath is provided over the catheter body, with a gap between the lumen of the sheath and the catheter body. The size of the gap at its distal end can be changed by axial movement of the sheath relative to the catheter body at a position corresponding to the distal end of the sheath lumen. This allows for the introduction of saline solution, which can then drain into the blood vessel from the distal end of the gap to achieve ultrasound positioning or to prevent blood from entering the gap from the distal end. A Luer connector is provided on the sheath, and a hemostatic valve is provided at the proximal end of the sheath, communicating with the lumen of the sheath. A sterile protective sleeve is provided between the hemostatic valve and the Luer connector. Compared with existing technologies, this invention prevents end electrode dislodgement, cardiac perforation, and patient infection, and enables ultrasound positioning monitoring.

Description

Technical Field

[0001] This invention relates to a medical device, and more particularly to a temporary pacing catheter with barbs for fixing electrodes for cardiac electrophysiological intervention. Background Technology

[0002] Temporary pacing catheters are core devices for the clinical treatment of severe bradycardia, cardiac arrest, and other critical conditions, as well as for perioperative cardiac protection during surgery. With the development of interventional treatment for structural heart disease, temporary cardiac pacing has also become an essential procedure in percutaneous aortic valve replacement surgery. Existing products generally suffer from electrode tip dislodgement, leading to unstable sensing or pacing function, and even causing fatal complications such as cardiac perforation and cardiac tamponade. Furthermore, patients must maintain a fixed position for extended periods during use, significantly reducing comfort and increasing the risk of pulmonary infection, pressure sores, and deep vein thrombosis in the lower extremities. Current temporary pacing catheters with fixed structures either have complex fixation designs or are prone to causing cardiac damage during use, making it difficult to simultaneously achieve both effectiveness and safety. Summary of the Invention

[0003] The purpose of this invention is to provide a temporary pacing catheter with barbs for fixing electrodes. The technical problem to be solved is to prevent the end electrode from dislodging and improve the safety of the operation. At the same time, it also solves the problem of keeping the sheath in a sterile state during withdrawal, avoiding patient infection, and enabling ultrasound positioning by injecting saline.

[0004] To solve the above problems, the present invention adopts the following technical solution: a temporary pacing catheter with barbs for fixing electrodes, comprising a catheter body, an end electrode disposed at the distal end of the catheter body, and a ring electrode disposed at the distal end of the catheter body. The catheter body has a catheter lumen, and the end electrode is provided with a positioning element. The positioning element has a pre-fabricated hook-shaped structure and shape memory function, which can deform under external force and return to its original shape after the external force is removed. A detachable sheath is disposed outside the catheter body and can move axially along the catheter body. There is a gap between the lumen of the sheath and the catheter body, at least the size of the gap at the distal end is such that at the position corresponding to the distal end of the sheath lumen and the catheter body, the gap can be passed through the sheath relative to the catheter body. The gap changes with the axial movement of the catheter body; when the distal end of the gap increases, normal saline can be introduced and discharged into the blood vessel from the distal end of the gap to achieve ultrasound positioning; when the distal end of the gap decreases, it can prevent blood from entering the gap from the distal end; the sheath is equipped with a Luer connector that can move along the axial direction of the sheath, and the proximal end of the sheath is equipped with a hemostatic valve with adjustable tightness. The hemostatic valve is connected to the lumen of the sheath, and a retractable sterile protective sleeve is provided between the hemostatic valve and the Luer connector. The proximal end of the sterile protective sleeve is connected to the proximal end of the hemostatic valve, and the distal end of the sterile protective sleeve is connected to the proximal end of the Luer connector. The hemostatic valve is also equipped with a bypass, which is connected to the lumen of the sheath for injecting normal saline.

[0005] Furthermore, the positioning element includes at least three barbed arms, which are evenly distributed around the outer periphery of the end electrode. The barbs on the barbed arms are turned outward away from the axis of the catheter body and the openings face the proximal end of the catheter body.

[0006] Furthermore, the tip of the barbed arm is arc-shaped or outwardly flared.

[0007] Furthermore, the positioning component also includes a ring, with the barbed arm fixed on the ring and the ring fixed on the end electrode.

[0008] Furthermore, the surface of the end electrode is provided with a surface groove corresponding to the position of the barbed arm. After the barbed arm is deformed by external force, at least part of the structure of the barbed arm is accommodated in the surface groove.

[0009] Furthermore, the catheter body includes an equal-diameter section and a first variable-diameter section arranged sequentially from the proximal end to the distal end. The outer diameter of the first variable-diameter section is smaller than that of the equal-diameter section. A second variable-diameter section is provided at the distal end of the sheath lumen. The diameter of the second variable-diameter section is equal to the outer diameter of the equal-diameter section, which allows the distance between the second variable-diameter section and the catheter body to change when the sheath is pushed forward or retracted. When the sheath is pushed forward, the second variable-diameter section is located at the first variable-diameter section, increasing the gap between the second variable-diameter section and the catheter body at the corresponding position, so that physiological saline can flow out from the gap after being introduced, achieving ultrasound positioning. When the sheath is retracted, the second variable-diameter section is located at the equal-diameter section, decreasing the gap between the second variable-diameter section and the catheter body at the corresponding position, preventing blood from flowing into the gap between the sheath and the catheter body and forming a thrombus. The second variable-diameter section can also deform the barbed arm and retract it into the lumen of the sheath. The end electrode and the ring electrode are both located on the first variable-diameter section.

[0010] Furthermore, a tapered transition section is provided between the first variable diameter section and the catheter body.

[0011] Furthermore, the overall rigidity of the catheter body gradually decreases from the proximal end to the distal end.

[0012] Furthermore, a position mark is provided at the proximal end of the catheter body.

[0013] Compared with existing technologies, this invention features a pre-fabricated hook-shaped positioning element on the end electrode. After the sheath is inserted into the right ventricle and withdrawn, the positioning element returns to its pre-fabricated hook shape and hooks onto the myocardium, ensuring the end electrode is stably attached to the apex of the right ventricle and preventing dislocation. An axially sliding Luer connector is provided on the sheath, and a retractable sterile protective sleeve is placed between the proximal end of the sheath and the proximal end of the Luer connector. When the sheath is withdrawn, the portion of the sheath outside the proximal end of the Luer connector remains within the sterile protective sleeve, ensuring the sheath remains sterile upon re-entry and preventing patient infection. The catheter is inserted through the sheath via bypass injection of saline solution, and ultrasound positioning monitoring can determine the catheter's location, reducing the need for X-rays. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention.

[0015] Figure 2 This is a schematic diagram of the structure of the terminal electrode of the present invention.

[0016] Figure 3 This is a schematic diagram of the structure of the first type of pre-designed hook-shaped fastener of the present invention.

[0017] Figure 4 This is a schematic diagram of the structure of the second type of pre-set hook-shaped fastener of the present invention.

[0018] Figure 5 This is a schematic diagram of the structure of the distal end of the sheath of the present invention.

[0019] Figure 6 This is a schematic diagram of the structure when the sheath of the present invention is pushed forward.

[0020] Figure 7 This is a schematic diagram of the structure of the sheath of the present invention. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0022] In this invention, the distal end refers to the end furthest from the surgeon; the proximal end refers to the end closest to the surgeon.

[0023] like Figure 1 and Figure 2 As shown, the present invention discloses a temporary pacing catheter with barbs for fixing electrodes, comprising:

[0024] The catheter body 8 has a catheter lumen 81. From the distal end to the proximal end, there are a terminal electrode 1, a ring electrode 3, a connecting handle 9, and a tail wire 10. The terminal electrode 1 is in the shape of a plug and is sealed and fixed to the distal end of the catheter body 8. The ring electrode 3 is located at the distal end of the catheter body 8 and is 5-20 mm away from the terminal electrode.

[0025] The terminal electrode 1 is provided with a positioning element 2, which has a pre-made hook-shaped structure with shape memory function. It can be deformed under external force and returns to its original shape after the external force is removed. A safety wire 112 and a lead wire 113 are welded to the proximal end of the terminal electrode 1. The lead wire 113 passes through the catheter lumen 81 of the catheter body 8 and the connecting handle 9 and is electrically connected to the tail wire 10. The welding of the lead wire 113 and the tail wire 10 is located inside the connecting handle 9. The lead wire 113 is used to transmit pacing signals. The proximal end of the safety wire 112 is connected and fixed to the distal lumen wall of the catheter lumen 81 by welding. The safety wire 112 is used to prevent the terminal electrode 1 from falling off.

[0026] The sheath 4 is detachably fitted over the catheter body 8, with a gap between the sheath 4 and the catheter lumen 81 (meaning the outer diameter of the sheath 4 is larger than the diameter of the catheter lumen 81). The sheath 4 is equipped with a Luer connector 5 that can move axially along the sheath 4. The Luer connector 5 is used to connect to a hemostatic valve at the proximal end of an external push-pull sheath, thus connecting the sheath 4 to the external push-pull sheath. The type of Luer connector 5 is selected based on the type of the external push-pull sheath. For example, if the type of the external sheath is 7F, then the Luer connector 5 is compatible with the hemostatic valve used for that type. The sheath 4 has an adjustable hemostatic valve 7 at its proximal end, which is connected to the lumen of the sheath 4. A retractable sterile protective sleeve 6 is provided between the hemostatic valve 7 and the Luer connector 5. The sterile protective sleeve 6 is fitted onto the body of the sheath 4. The proximal end of the sterile protective sleeve 6 is sealed to the proximal end of the hemostatic valve 7, and the distal end of the sterile protective sleeve 6 is sealed to the proximal end of the Luer connector 5. The connection can be sealed and fixed by adhesive bonding. A bypass is also provided on the hemostatic valve 7, which is connected to the lumen of the sheath 4 for injecting physiological saline.

[0027] In this invention, such as Figure 1 As shown, the bypass consists of a flexible tube 12 and a two-way valve 11. The distal end of the flexible tube 12 is connected to the lumen of the sheath 4, and the proximal end of the flexible tube 12 is connected to one end of the valve port of the two-way valve 11. The two-way valve 11 is used to connect a syringe.

[0028] like Figure 3 As shown, the positioning element 2 includes at least three barbed arms 21, which are evenly distributed around the outer periphery of the end electrode 1. The barbs on the barbed arms 21 are turned outwards away from the axis of the catheter body 8 and the openings face the proximal end of the catheter body 8. Preferably, there are four barbed arms 21. In this invention, the barbed arms 21 have two structures. The first type is as follows: Figure 3 As shown, the tip 23 of the barbed arm 21 is an outwardly flared rounded head, and the second type is as follows: Figure 4 The arc shape shown.

[0029] The barbed arm 21 with the above two structures can effectively protect the myocardium and will not scratch the myocardial wall.

[0030] like Figure 3 and Figure 4 As shown, the positioning component 2 also includes a ring 22, the barb arm 21 is fixed on the ring 22, and the ring 22 is fixed on the end electrode 1.

[0031] like Figure 2 As shown, the end electrode 1 is cylindrical in shape, with a protrusion 101 at its proximal end. The protrusion 101 of the end electrode 1 is embedded into the distal end of the catheter body 8 using a thermal fusion process. The surface of the end electrode has surface grooves 111, the same number as the barbs 21, for retrieval of the barbs during surgery. A safety line 112 and a wire 113 are welded to the proximal end of the end electrode. In this invention, the end electrode has a diameter of 1.3–2.4 mm and a length of 1–4 mm. The end electrode 1 is made of platinum-iridium alloy, stainless steel, or gold. The safety line 112 is fixed to the distal end of the catheter lumen 81 of the catheter body 8 to prevent the end electrode 1 from falling off. The safety line 112 is a stainless steel rope. The wire 113 is a copper wire with a diameter of 0.01–0.2 mm.

[0032] In this invention, the barbed arm 21 is prefabricated as follows: Figure 3 and Figure 4 The hook-shaped structure has shape memory function, and the barbed arm 21 in its natural state is like... Figure 3 and Figure 4 As shown, in a dispersed state, pushing the sheath 4 deforms the dispersed barbed arms 21, causing them to retract into the groove 111 on the surface of the end electrode. Together with the sheath 4, they enter the heart through a larger pushing sheath. Once the device enters the heart, the sheath 4 is retracted, and the barbs return to their dispersed state. By adjusting the position of the tip of the catheter body, the barbed arms 21 hook onto the myocardium, thus fixing the end electrode 1. The positioning element 2 is made of a shape memory alloy, such as a nickel-titanium alloy, or a shape memory polymer.

[0033] In this invention, the barbed arm 21 can be entirely accommodated in the surface groove 111.

[0034] The barbed arm 21 and the ring 22 can be integrally formed. Alternatively, they can be processed separately and then fixed together by welding to reduce processing costs.

[0035] like Figure 1As shown, the annular ring electrode 3 on the surface of the catheter body 8 is used for bipolar pacing with the terminal electrode 1. The distance between the ring electrode 3 and the terminal electrode 1 is 5mm-20mm. The inner diameter of the ring electrode 3 is 1.4-2.5mm, and the ring electrode 3 can be nested on the catheter body 8. The outer diameter of the ring electrode 3 is 1.45-2.55mm, and the width is 0.5-4mm. The wire connected to the inner side of the ring electrode 3 passes through the catheter lumen 81 of the catheter body 8 and is welded to the tail wire 10. The weld point is then fixed inside the connecting handle 9. The ring electrode 3 is made of platinum-iridium alloy, stainless steel, or gold. The wire on the ring electrode 3 is made of copper wire with a diameter of 0.01-0.2mm.

[0036] like Figure 5 and Figure 6 As shown, a position mark 82 is provided at the proximal end of the catheter body 8 to determine the relative position of the distal end of the sheath 4 and the positioning element 2. During the operation, the proximal end of the catheter body 8 is connected to the handle 9 outside the body. The length difference between the sheath 4 and the catheter body 8 is 50-200mm. The position mark 82 is set at the position corresponding to the distal end of the sheath 4 retracting the barbed arm 21 after the proximal end of the catheter body 8 has retracted. In this way, the position mark 82 is always outside the body. When the sheath 4 is pushed, when the position mark 82 appears at the proximal end of the sheath 4, the distal end of the sheath 4 has just retracted the barbed arm 21.

[0037] The gap between the lumen of the sheath 4 and the catheter body 8, at least at the distal end of the gap, can be changed by axial movement of the sheath 4 relative to the catheter body 8 at the position corresponding to the distal end of the lumen of the sheath 4. When the distal end of the gap increases, physiological saline can be introduced and discharged from the distal end of the gap into the blood vessel to achieve ultrasound positioning; when the distal end of the gap decreases, it can prevent blood from entering the gap from the distal end. The above implementation can be specifically achieved by the following structure:

[0038] like Figure 5 and Figure 6As shown, the catheter body 8 includes an equal diameter section 85 and a first variable diameter section 83 disposed at the distal end of the equal diameter section 85. The proximal end of the equal diameter section 85 is connected and fixed to the connecting handle 9. The outer diameter of the first variable diameter section 83 is smaller than the outer diameter of the equal diameter section 85. The end electrode 1 and the ring electrode 3 are both disposed on the first variable diameter section 83, and the position mark 82 is disposed on the proximal end of the equal diameter section 85. A second variable diameter section 41 with a diameter equal to the outer diameter of the equal diameter section 85 is provided at the distal end of the sheath 4 lumen, so that the wall thickness of the second variable diameter section 41 is greater than the wall thickness of the rest of the sheath 4. This allows the distance between the second variable diameter section 41 and the catheter body 8 to change when the sheath 4 is pushed forward or retracted. When the sheath 4 is pushed forward, the second variable diameter section 41 is located at the first variable diameter section 83, which increases the gap between the second variable diameter section 41 and the catheter body 8 at the corresponding position (i.e., the distal end of the gap is increased), so that after the introduction of saline, the saline can flow out from the distal end of the gap and into the blood vessel, achieving ultrasound positioning. When the sheath is retracted, the second variable diameter section 41 is located at the equal diameter section 85, and the gap between the second variable diameter section 41 and the catheter body 8 at the corresponding position is decreased (i.e., the distal end of the gap is decreased), to prevent blood from flowing into the gap from the distal end and forming a thrombus. The second variable diameter section 41 can also deform the barbed arm 21 and retract it into the lumen of the sheath 4.

[0039] The length (in the axial direction) of the second variable-diameter section 41 of the sheath 4 is 5-10 mm, and the outer diameter of the remaining portion is larger than the inner diameter of the second variable-diameter section 41 and is set at the same diameter. When the sheath 4 is in the initial position / retracted, the gap between the second variable-diameter section 41 and the equal-diameter section 85 is minimal (close to 0), which can effectively prevent blood from entering the gap between the catheter body and the sheath 4 and forming a thrombus. When the sheath 4 is pushed forward so that the second variable-diameter section 41 is at the position of the first variable-diameter section 41, the gap between the first variable-diameter section 83 and the second variable-diameter section 41 increases, which can form a space for the introduction of saline. This design ensures that when saline is injected, enough saline can enter the heart through the gap between the lumen of the sheath 4 and the catheter body 8, which is convenient for ultrasound to clearly identify and accurately locate the tip position. In addition, the second variable-diameter section 41 has a wall thickness greater than the wall thickness of the rest of the sheath 4, so it has sufficient support and can easily retract the barbed arm 21.

[0040] The first variable diameter section 83 can be connected and fixed to the equal diameter section 85 by gluing or welding to form a complete catheter body 8, or it can be integrally molded using the same material. A tapered transition section 84 is also provided between the first variable diameter section 83 and the equal diameter section 85 to ensure a smooth transition between the two sections.

[0041] In this invention, the overall hardness of the catheter body 8 gradually decreases from proximal to distal, with the first variable-diameter section 83 having the lowest hardness and the proximal end of the constant-diameter section 85 having the highest hardness. This multi-hardness segment design, with a softer distal end, adapts to the complex anatomy of the heart, protects the myocardium, stabilizes electrode contact, and prevents perforation / valve damage. The proximal end of the catheter body 8 has the highest hardness, facilitating manipulation. In this invention, hardness can be achieved by changing the wall thickness of the catheter body 8, or by using multiple segments with different hardnesses connected together by welding or bonding. Alternatively, wire mesh reinforcement can be incorporated into the proximal end of the catheter body 8. Hardness can also be achieved through material blending.

[0042] like Figure 7 As shown, an adjustable hemostatic valve 7 is provided at the proximal end of the sheath 4. When the positioning member 2 is retracted, the hemostatic valve 7 is adjusted to a looser state for easy pushing. After the catheter body 8 enters the heart, the hemostatic valve 7 is locked to prevent blood from flowing out. A two-way valve 11 is provided on the side of the hemostatic valve 7, which is connected to the lumen of the sheath 4 through a flexible tube 12. When the present invention enters the heart, the syringe is connected to the two-way valve 11 to inject physiological saline. The physiological saline passes through the gap between the flexible tube 12, the sheath 4 and the catheter body 8, and enters the heart from the distal end of the sheath 4 to generate air bubbles. By ultrasound monitoring, the position of the distal end of the catheter body can be determined, thereby reducing the use of X-rays.

[0043] In this invention, the hemostatic valve 7 can be an existing press-type adjustable hemostatic valve (press-type Y-shaped hemostatic valve) or a knob-type adjustable hemostatic valve. By pressing or turning the knob, the size of the through hole on the hemostatic valve can be changed so that the hemostatic valve 7 can be relatively fixed on the catheter body 8 to stop bleeding.

[0044] For example, patent number 201510258854.4, invention titled "A Hemostatic Valve and Opening Adjustment Mechanism Disclosed in an Adjustable Valve Catheter Sheath", or the push-type hemostatic valve disclosed in the Shunmei Medical Push-Click model in the prior art, or the push-type hemostatic valve (Y-type connection valve) of Shenzhen Yixinda Medical New Technology Co., Ltd. model SCW-HV-2.

[0045] Of course, the distal end of the sheath 4 can also be prefabricated into a curved shape that fits the structure of the heart, making it easy to reach the target location.

[0046] like Figure 7As shown, the retractable sterile protective sleeve 6 is provided on the sheath 4. When the present invention is inserted into the heart, the Luer connector 5 is connected to the hemostatic valve of the external push sheath. When the sheath 4 is withdrawn, since the Luer connector 5 and the sheath 4 are slidably connected, the main body of the sheath 4 is always inside the retractable sterile protective sleeve 6, which can ensure sterility during the withdrawal of the sheath 4 from the body. When the sheath 4 re-enters the body, it can prevent the patient from being infected.

[0047] In this invention, the connecting handle 9 can be a cylinder or cuboid with a tapered distal end. The connecting handle 9 consists of two interconnected outer shells. The wires of the end electrode 1 and the ring electrode 3 are connected to the tail wire 10 by welding. The welding point is located inside the connecting handle 9 and fixed with glue. The upper and lower covers are then ultrasonically welded. The operator can hold the connecting handle to operate the catheter. The tail wire 10 of this invention is pin-shaped and can be adapted to conventional external pacemakers currently on the market.

[0048] The method of using this invention is as follows: Adjust the hemostatic valve 7 to a looser state. After the distal end of the pre-shaped sheath is bent, push the sheath 4 to the position mark 82 of the catheter body 8. After the barbed arm 21 is retracted into the groove 111 on the surface of the end electrode 1, lock the hemostatic valve 7. Through the femoral vein / subclavian vein approach, the catheter of this invention is delivered to the right ventricle. Connect the Luer connector 5 to the proximal hemostatic valve of the 7F sheath or a larger sheath. After connecting the syringe and the two-way valve 11, inject normal saline. The normal saline passes through the gap between the tubing 12, the sheath 4 and the catheter body 8, and enters the heart from the distal end of the sheath 4 to generate microbubbles. By monitoring with ultrasound and electrocardiogram, determine the position of the distal end of the catheter body. When the distal end reaches the apex of the right ventricle, adjust the hemostatic valve 7 to a looser state, retract the sheath 4, allowing the barbed arm 21 to naturally open, and lock the hemostatic valve 7. Continuously adjust the position of the distal end of the catheter body so that the barbed arm 21 hooks onto the myocardium, and the terminal electrode 1 is stably attached to the apex of the right ventricle. Connect the tail wire 10 to the external pacemaker, adjust the pacemaker parameters, and perform stable pacing of the heart. After pacing, release the hemostatic valve 7, push the sheath 4 to the position mark 82, retract the barbed arm 21, and withdraw the entire device from the body.

[0049] The present invention solves the problems of easy displacement of the catheter body and poor fixation effect through the above structure, avoids damage to the myocardium, and improves the safety of the operation.

Claims

1. A temporary pacing catheter with barbs for fixing electrodes, comprising a catheter body (8), an end electrode (1) disposed at the distal end of the catheter body (8), and a ring electrode (3) disposed at the distal end of the catheter body (8), characterized in that: The catheter body (8) has a catheter lumen (81), and a positioning element (2) is provided on the end electrode (1). The positioning element (2) has a prefabricated hook-shaped structure and shape memory function, which can be deformed under external force and return to its original shape after the external force is removed. A detachable sheath (4) is provided on the catheter body (8) and can move along the axial direction of the catheter body (8). There is a gap between the lumen of the sheath (4) and the catheter body (8). At least the size of the distal end of the gap can be changed by the axial movement of the sheath (4) relative to the catheter body (8) at the position corresponding to the distal end of the lumen of the sheath (4) and the catheter body (8). When the distal end of the gap increases, physiological saline can be introduced and discharged from the distal end of the gap. It enters the blood vessel to achieve ultrasound positioning; when the distal end of the gap decreases, it can prevent blood from entering the gap from the distal end of the gap; the sheath (4) is provided with a Luer connector (5) that can move along the axial direction of the sheath (4); the proximal end of the sheath (4) is provided with a hemostatic valve (7) with adjustable tightness; the hemostatic valve (7) is connected to the lumen of the sheath (4); a retractable sterile protective sleeve (6) is provided between the hemostatic valve (7) and the Luer connector (5); the proximal end of the sterile protective sleeve (6) is connected to the proximal end of the hemostatic valve (7); the distal end of the sterile protective sleeve (6) is connected to the proximal end of the Luer connector (5); the hemostatic valve (7) is also provided with a bypass, which is connected to the lumen of the sheath (4) for injecting physiological saline.

2. The temporary pacing catheter with barbs for fixing electrodes according to claim 1, characterized in that: The positioning element (2) includes at least three barbed arms (21), which are evenly distributed around the outer periphery of the end electrode (1). The barbs on the barbed arms (21) are turned outward away from the axis of the catheter body (8) and the openings face the proximal end of the catheter body (8).

3. The temporary pacing catheter with barbs for fixing electrodes according to claim 2, characterized in that: The tip of the barbed arm (21) is arc-shaped or outwardly flared.

4. The temporary pacing catheter with barbs for fixing electrodes according to claim 3, characterized in that: The positioning component (2) also includes a ring (22), a barbed arm (21) is fixed on the ring (22), and the ring (22) is fixed on the end electrode (1).

5. The temporary pacing catheter with barbs for fixing electrodes according to any one of claims 2-4, characterized in that: The surface of the end electrode (1) is provided with a surface groove (111) corresponding to the position of the barbed arm (21). After the barbed arm (21) is deformed by external force, at least part of the structure of the barbed arm (21) is accommodated in the surface groove (111).

6. The temporary pacing catheter with barbs for fixing electrodes according to claim 1, characterized in that: The catheter body (8) includes an equal diameter section (85) and a first variable diameter section (83) arranged sequentially from proximal to distal. The outer diameter of the first variable diameter section (83) is smaller than that of the equal diameter section (85). A second variable diameter section (41) is provided at the distal end of the sheath (4). The diameter of the second variable diameter section (41) is equal to the outer diameter of the equal diameter section (85), so that the distance between the second variable diameter section (41) and the catheter body (8) can be changed when the sheath (4) is pushed forward or retracted. When the sheath (4) is pushed forward, the second variable diameter section (41) is located at the first variable diameter section (83), so that the distance between the second variable diameter section (41) and the catheter body (8) can be changed. 1) The gap between the sheath and the catheter body (8) at the corresponding position is increased so that the saline solution can flow out from the gap after being introduced, thus achieving ultrasound positioning; when the sheath is retracted, the second variable diameter section (41) is located at the equal diameter section (85), and the gap between the second variable diameter section (41) and the catheter body (8) at the corresponding position is reduced to prevent blood from flowing into the gap between the sheath (4) and the catheter body (8) to form a thrombus; the second variable diameter section (41) can also deform the barbed arm (21) and retract it into the lumen of the sheath (4), and the end electrode (1) and the ring electrode (3) are both set on the first variable diameter section (83).

7. The temporary pacemaker catheter with barbs for fixing electrodes according to claim 6, characterized in that: A tapered transition section (84) is provided between the first variable diameter section (83) and the catheter body (8).

8. The temporary pacing catheter with barbs for fixing electrodes according to claim 1, 6, or 7, characterized in that: The overall hardness of the catheter body (8) gradually decreases from the proximal end to the distal end.

9. The temporary pacing catheter with barbs for fixing electrodes according to claim 8, characterized in that: The proximal end of the catheter body (8) is provided with a position mark (82).

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