Catheter adjustment handle and ablation system

Abstract

This invention discloses a catheter adjustment handle, including a handle body with an internal cavity. An insertion port for inserting an ablation catheter is located at the distal end of the handle body, and an exit port for the inner tube of the ablation catheter to pass through. An adjustment mechanism is also provided on the handle body, which pushes the inner tube of the ablation catheter axially to adjust the diameter of the basket at the distal end of the ablation catheter. This invention also discloses an ablation system. Compared with the prior art, the adjustment mechanism on the handle body axially pushes the inner tube of the ablation catheter, thereby changing the diameter of the basket. This ensures that the basket does not deform unexpectedly after receiving external force, preventing the adjacent electrode arms of the basket from becoming too close due to deformation, thus avoiding the risk of arcing or short circuits. Furthermore, the adjustment mechanism allows for single-handed operation, eliminating the need for multiple operators.

Description

Technical Field

[0001] This invention relates to a medical device, and more particularly to a catheter adjustment handle and ablation system. Background Technology

[0002] Atrial fibrillation (AF) is a rapid heart rhythm disorder. Its incidence increases with age, reaching up to 10% in people over 75. During AF, the atrial rate reaches 300–600 beats per minute, and the heart rate is often rapid and irregular, sometimes reaching 100–160 beats per minute. This is not only much faster than a normal heartbeat but also completely irregular, and the atria lose their effective contractile function. The prevalence of AF is also closely related to coronary heart disease, hypertension, and heart failure.

[0003] In recent years, the number of catheter ablation procedures for atrial fibrillation has increased significantly. Catheter ablation involves inserting a thin ablation catheter into the heart chambers via a vein in the thigh, and after puncturing the interatrial septum, further inserting it into the left atrium. Inside the left atrium, the operator can release energy through an electrode at the catheter tip to ablate or isolate the tissue in the myocardium that contributes to atrial fibrillation (preventing it from connecting with other myocardial tissue).

[0004] During atrial fibrillation treatment, the surgeon inserts an ablation catheter through the interatrial septum into the left atrium to ablate the myocardium surrounding the pulmonary veins. Traditional procedures use a single-electrode ablation catheter for point-to-point ablation, which is inefficient and time-consuming. To address this issue, some companies have developed basket-shaped multi-arm, multi-electrode ablation catheters, enabling one-shot ablation of the pulmonary veins. These electrode arms are typically supported by a single shape-memory alloy wire / plate, making them prone to deformation and retraction into the catheter sheath, but also susceptible to unexpected deformation due to external forces. In particular, when two adjacent electrode arms are brought too close together due to external forces, the electrode spacing on the arms becomes too small, potentially leading to arcing or even short circuits. Summary of the Invention

[0005] The purpose of this invention is to provide a catheter adjustment handle and an ablation system. The technical problem to be solved is to address the issue that basket-shaped ablation catheters are easily deformed by external forces within the heart chamber, thereby improving surgical safety.

[0006] To solve the above problems, the present invention adopts the following technical solution: a catheter adjustment handle, including a handle body, characterized in that: the handle body has a cavity inside, a catheter insertion port for inserting an ablation catheter is provided at the distal end of the handle body so that the ablation catheter is fixed in the handle body, an outlet for the inner tube of the ablation catheter to pass through is provided on the handle body, and a diameter adjustment mechanism is provided on the handle body, the diameter adjustment mechanism pushes the inner tube of the ablation catheter to move axially so as to adjust the diameter of the basket at the distal end of the ablation catheter.

[0007] Furthermore, the diameter adjustment mechanism includes a first sliding member and a first limiting member. A first sliding groove is provided on the outer wall of the handle body along the axial direction of the handle body. The first limiting member is located in the cavity of the handle body. The connecting part of the first sliding member passes through the first sliding groove and extends into the cavity of the handle body and is connected and fixed to the first limiting member. A fixing groove for fixing the inner tube of the ablation catheter is provided on the first limiting member, so that the inner tube of the ablation catheter passes through the fixing groove and is fixed thereto, thereby realizing that pushing the first sliding member drives the first limiting member to drive the inner tube of the ablation catheter to move axially.

[0008] Furthermore, the diameter adjustment mechanism also includes a second limiting member, which is fixed in the cavity of the handle body. The second limiting member is provided with a second sliding groove arranged along the axial direction of the handle body. The first limiting member is disposed in the second sliding groove and can move back and forth in the second sliding groove to guide the first limiting member.

[0009] Furthermore, a pressure plate is provided on one side of the fixed through groove on the first limiting member, and a pressure cover is provided on the pressure plate. The pressure cover is n-shaped and has a through groove. The pressure cover covers the first limiting member through the through groove and presses the pressure plate on the first limiting member. The two ends of the pressure cover are fixed on the second limiting member. The pressure plate is provided with an adjustment screw that cannot be removed, and the pressure cover is provided with an adjustment screw hole. The adjustment screw is threadedly connected to the adjustment screw hole, so that when the adjustment screw is turned, the pressure plate can move axially along the adjustment screw hole.

[0010] Furthermore, a fixing seat is provided in the cavity of the handle body, and the fixing seat is fixed in the handle body. The fixing seat has a fixing seat cavity. A first fixing seat through hole communicating with the fixing seat cavity is provided on the end of the fixing seat opposite to the catheter insertion port, so as to fix the outer tube of the ablation catheter in the first fixing seat through hole. A second fixing seat through hole communicating with the fixing seat cavity is provided on the proximal end face of the fixing seat, so as to allow the inner tube of the ablation catheter to pass through the fixing seat. A hemostatic valve is provided on the side of the fixing seat cavity located at the second fixing seat through hole.

[0011] Furthermore, the fixed base is also provided with a tubular side arm, which extends from a hole on the handle body to the handle body, and a three-way valve is connected to the side arm.

[0012] Furthermore, the handle body is also provided with a bending adjustment mechanism, which includes a rotary adjustment component and a second sliding component. The rotary adjustment component is rotatably fixed in the cavity of the handle body. A rotation window is provided on the outer wall of the handle body at the position of the rotary adjustment component to expose part of the rotary adjustment component. The outer wall of the second sliding component is provided with threads. The rotary adjustment component is provided with an adjustment component through hole for the second sliding component to pass through. The adjustment component through hole is a threaded hole to achieve threaded connection with the second sliding component. A second guide component is provided in the cavity of the handle body. An axially arranged guide groove is provided on the second sliding component. The second guide component is located in the guide groove. When the rotary adjustment component is rotated in the rotation window, it drives the second sliding component to move axially to pull the two pull wires of the ablation catheter, thereby adjusting the curvature of the distal end of the ablation catheter.

[0013] Furthermore, a first guide is provided in the cavity of the handle body. One end of the first guide is connected to the through-hole. The first guide has a first guide through-hole, which communicates with the through-hole, so that the inner tube extends out of the handle body from the through-hole through the first guide through-hole.

[0014] Furthermore, the handle body is also provided with a wire outlet, so that the electrode wire of the ablation catheter can be led out from the wire outlet and electrically connected to the electrical connector.

[0015] The present invention also discloses an ablation system, including an ablation catheter and the aforementioned catheter adjustment handle. The ablation catheter includes an outer tube, an inner tube coaxially arranged, and two pull wires. The inner tube is disposed in the outer tube and the two can move axially relative to each other. There is a through cavity between the inner tube and the outer tube. The outer tube is fixed in the cavity of the handle body. The inner tube is driven by a diameter adjustment mechanism to move axially in the outer tube, thereby adjusting the diameter of the basket located at the distal end of the ablation catheter.

[0016] Compared with the prior art, this invention uses an adjustment mechanism on the handle body to axially push the inner tube of the ablation catheter, thereby changing the diameter of the ablation catheter basket. This ensures that the basket will not deform unexpectedly after receiving external force, preventing the risk of arcing or short circuit caused by excessive proximity of two adjacent electrode arms due to deformation. At the same time, the adjustment mechanism enables single-handed operation, eliminating the need for multiple people to cooperate. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the external structure of the catheter adjustment handle of the present invention.

[0018] Figure 2 This is a schematic diagram of the internal structure of the catheter adjustment handle of the present invention.

[0019] Figure 3 yes Figure 2 A cross-sectional view along the AA direction.

[0020] Figure 4 This is a schematic diagram of the internal three-dimensional structure of the catheter adjustment handle of the present invention. Figure 1 .

[0021] Figure 5 This is a schematic diagram of the internal three-dimensional structure of the catheter adjustment handle of the present invention. Figure 2 .

[0022] Figure 6 This is a schematic diagram of the internal structure of the handle body of the present invention.

[0023] Figure 7 This is a schematic diagram of the structure between the first sliding member and the first limiting member of the present invention.

[0024] Figure 8 This is a schematic diagram of the internal structure of the fixing base of the present invention.

[0025] Figure 9 This is a schematic diagram of the external structure of the catheter adjustment handle of the present invention, which has a bending mechanism.

[0026] Figure 10 This is a schematic diagram of the internal structure of the catheter adjustment handle of the present invention, which has a bending mechanism.

[0027] Figure 11 This is a schematic diagram of the structure between the second slider and the handle body of the present invention.

[0028] Figure 12 This is a schematic diagram of the structure of the pressure cap of the present invention. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0030] 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.

[0031] like Figure 1 and Figure 2 As shown, the present invention discloses a catheter adjustment handle, including a handle body 1, which is a cylindrical structure with a cavity inside. A catheter insertion port 2 for inserting an ablation catheter is provided at the distal end of the handle body 1 so that the ablation catheter is fixed in the handle body 1. An outlet port 3 for the inner tube of the ablation catheter to pass through is provided on the handle body 1. A diameter adjustment mechanism 4 is provided on the handle body 1. The diameter adjustment mechanism 4 pushes the inner tube or outer tube of the ablation catheter to move axially to adjust the diameter of the basket at the distal end of the ablation catheter.

[0032] like Figure 2 , Figure 3 , Figure 6 and Figure 7As shown, the diameter adjustment mechanism 4 includes a first sliding member 41 and a first limiting member 42. A first sliding groove 11 is provided on the outer wall of the handle body 1. The first sliding groove 11 penetrates the outer wall of the handle body 1 on this side and extends along the axial direction of the handle body 1. The first limiting member 42 is provided in the cavity of the handle body 1. The connecting part of the first sliding member 41 passes through the first sliding groove 11 and extends into the cavity of the handle body 1 and is connected and fixed to the first limiting member 42. In this invention, the thickness of the connecting part on the first sliding member 41 is adapted to the groove width of the first sliding groove 11. A fixing through groove 421 for fixing the inner tube of the ablation catheter is provided on the first limiting member 42 so that after the inner tube of the ablation catheter passes through the fixing through groove 421 and is fixed thereto, the inner tube of the ablation catheter can be moved axially by pushing the first sliding member 41 to drive the first limiting member 42.

[0033] In this invention, the fixed through groove 421 is not limited to a through groove, but can also be replaced by a through hole provided on the first limiting member 42.

[0034] like Figure 3 and Figure 7 As shown, a slot 427 is provided on one end of the first limiting member 42 opposite to the first sliding member 41, so that the first sliding member 41 is tightly inserted into the slot 427 of the first limiting member 42 after passing through the first sliding groove 11. Of course, the slot 427 can be a through groove 421 that passes through the first limiting member 42, so that the slot 427 communicates with the fixed through groove 421, thereby pressing the tube body of the ablation catheter located in the fixed through groove 421 through the connecting part on the first sliding member 41, thereby fixing the inner tube of the ablation catheter to the first limiting member 42.

[0035] like Figure 2 , Figure 3 , Figure 6 and Figure 7 As shown, the diameter adjustment mechanism 4 also includes a second limiting member 43, which is fixed in the cavity of the handle body 1. The second limiting member 43 is provided with a second sliding groove 431 arranged along the axial direction of the handle body 1. The first limiting member 42 is disposed in the second sliding groove 431 and can move back and forth in the second sliding groove 431 to guide the first limiting member 42. The width of the first limiting member 42 is adapted to the width of the groove of the second sliding groove 431, so that the first limiting member 42 can move back and forth in the second sliding groove 431.

[0036] like Figure 6 and Figure 7 As shown, the second limiting member 43 is formed by a protrusion located on one side of the cavity wall of the first slide groove 11 in the cavity of the handle body 1. The first slide groove 11 is located in the second slide groove 431 and communicates with the second slide groove 431.

[0037] like Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the first limiting member 42 can fix the inner tube of the ablation catheter using the following structure: a pressure plate 422 is provided on one side of the first limiting member 42 located in the fixing groove 421, and a pressure cap 424 is provided on the pressure plate 422. The pressure cap 424 is n-shaped and includes two support arms 4241 and a connecting plate 4242. A through groove 426 is formed between the support arms 4241 and the connecting plate 4242. Figure 12 As shown, the pressure cap 424 covers the first limiting member 42 through the through groove 426 and presses the pressure plate 422 onto the first limiting member 42. The two support arms 4241 of the pressure cap 424 are fixed on the second limiting member 43. The pressure plate 422 is provided with a rotatable but non-removable adjusting screw 423. The end of the screw 423 is rotatably fixed on the pressure plate 422, that is, the screw 423 is rotatably engaged with the pressure plate 422, so that the adjusting screw 423 can be rotated but cannot be removed. The connecting plate 4242 is provided with an adjusting screw hole 425 for the adjusting screw 423 to pass through. The adjusting screw hole 425 and the through groove 426 are connected. When the pressure cap 424 covers the first limiting member 42, the adjusting screw 423 is threadedly connected to the adjusting screw hole 425 to restrict the pressure plate 422 in the pressure cap 424 and allow it to move axially along the adjusting screw hole 425.

[0038] When the pressure plate 424 is placed on the first limiting member 42, the distance between the connecting plate 4242 and the first limiting member 42 is greater than the thickness of the pressure plate 422. This allows the resistance of the first sliding member 41 to be adjusted by adjusting the clamping force between the pressure plate 422 and the first limiting member 42, so that the resistance is greater than the deformation force of the basket, thus limiting the deformation of the basket.

[0039] like Figure 7 and Figure 12 As shown, a pressure plate limiting groove 4243 adapted to the pressure plate 422 is provided on the end of the connecting plate 4242 opposite to the pressure plate 422 to prevent the pressure plate 422 from rotating during the rotation of the adjusting screw 423.

[0040] like Figure 3 and Figure 6 As shown, fixing posts 432 can also be provided on the two sides of the groove edge of the second limiting member 43, and fixing post holes 426 adapted to the fixing posts 432 are respectively provided on the support arm 4241 of the pressure cover 424 to achieve relative fixation of the pressure cover 424.

[0041] like Figure 1 As shown, a marking scale 13 is provided on the outer wall of the handle body 1 at the position of the first slide groove 11 to indicate the corresponding diameter of the basket of the ablation catheter. The distribution of the marking scale 13 can be as follows: Figure 1As shown, when the first slider 41 is located in the middle position of the first groove 11, the basket 104 is in the initial state corresponding to the middle value of the variable diameter. When the first slider 41 is slid toward the far end of the handle body 1, the diameter of the basket 104 gradually decreases. When the first slider 41 is slid toward the near end of the handle body 1, the diameter of the basket 104 gradually increases, thereby realizing the adjustment of the diameter of the basket.

[0042] like Figure 1 and Figure 2 As shown, the outlet 3 is located at the position of the handle body 1 near the diameter adjustment mechanism, and the guide tube insertion port 2 is coaxially arranged with the handle body 1.

[0043] like Figure 2 As shown, an arc-shaped first guide 5 is provided in the cavity of the handle body 1. One end of the first guide 5 is connected to the through-hole 3. The first guide 5 has a first guide through-hole 51, which communicates with the through-hole 3. In this invention, the first guide 5 can be a tubular structure or a groove set on the cavity wall of the handle body 1. The first guide 5 is provided to guide the inner tube 102 of the ablation catheter, preventing the inner tube 102 from folding during the pushing and pulling process. The other end of the first guide 5 can extend to be opposite to the fixed through-slot 421, thereby reducing the exposed part between the inner tube 102 and the distal end of the first guide 5 after passing through the first sliding member 41, so as to avoid the problem of the inner tube 102 folding and entanglement with the electrode wire 108 of the ablation catheter.

[0044] like Figure 2 As shown, the handle body 1 is also provided with a wire outlet 6, so that the electrode wire of the ablation catheter can be led out from the wire outlet 6 and electrically connected to the electrical connector 109; the wire outlet 6 is located on the proximal end face of the handle body 1.

[0045] like Figure 2 and Figure 8 As shown, a fixing seat 7 is provided in the cavity of the handle body 1. The fixing seat 7 is fixed in the handle body 1. The fixing seat 7 has a fixing seat cavity 71. A first fixing seat through hole 72 communicating with the fixing seat cavity 71 is provided on the end of the fixing seat 7 opposite to the catheter insertion port 2, so as to fix the outer tube of the ablation catheter in the first fixing seat through hole 72. A second fixing seat through hole 73 communicating with the fixing seat cavity 71 is provided on the proximal end face of the fixing seat 7, so as to allow the inner tube of the ablation catheter to pass through the fixing seat 7. A hemostatic valve 74 is provided on the side of the fixing seat cavity 71 located at the second fixing seat through hole 72 to prevent fluid leakage.

[0046] Since the existing ablation catheter 100 can also be used for liquid infusion, a tubular side arm 75 is also provided on the fixation seat 7. The side arm 75 extends from the hole on the handle body 1 to the outside of the handle body 1. A three-way valve 76 is connected to the side arm 75, and the side wall 75 communicates with the cavity 71 of the fixation seat.

[0047] like Figure 9 and Figure 10 As shown, based on the above structure, the handle body 1 is further provided with a bending mechanism 8. The bending mechanism 8 can be located near the diameter adjustment mechanism. The bending mechanism 8 includes a rotary adjustment member 81, a second sliding member 82, and a pulley 83. Both the rotary adjustment member 81 and the second sliding member 82 are cylindrical. The rotary adjustment member 81 is rotatably fixed in the cavity of the handle body 1. A rotation window 12 is provided on the outer wall of the handle body 1 at the position of the rotary adjustment member 81 to partially expose the rotary adjustment member 81. The outer wall of the second sliding member 82 is provided with threads, and the rotary adjustment member 81 is provided with a mechanism for the second sliding member to slide. The adjusting member 82 passes through the adjusting member through hole 811, which is a threaded hole to achieve threaded connection with the second sliding member 82. The pulley 83 is fixed to the cavity wall of the handle body 1 near the second sliding member 82 via a rotating shaft, so that one of the pull wires of the ablation catheter can be wrapped around the near end of the pulley 83 and fixed to the second sliding member 82, while the other pull wire is directly fixed to the second sliding member 82. When the adjusting member 81 is rotated in the rotating window 12, it drives the second sliding member 82 to move axially, so as to pull the two pull wires of the ablation catheter and adjust the curvature of the distal end of the ablation catheter.

[0048] like Figure 11 As shown, the rotating adjustment component 81 can be fixed by providing an annular groove 14 on the cavity wall of the handle body 1. The rotating adjustment component 81 is adapted to the annular groove 14 to limit the rotating adjustment component 81 to rotate axially within the annular groove 14. The outer diameter of the rotating adjustment component 81 is larger than the cavity diameter of the handle body 1. A guide groove 821 is provided on the second sliding component 82, which extends axially along the second sliding component 82. A second guide component 15 adapted to the guide groove 821 is provided on the cavity wall of the handle body 1 to restrict the second sliding component 82 to move axially only and not rotate, and to limit the range of axial movement of the second sliding component 82 to prevent excessive bending of the conduit.

[0049] like Figure 11 As shown, the second guide member 15 is a protruding post on the cavity wall of the handle body 1. There are two guide grooves 821, which are symmetrically arranged on opposite sides of the second sliding member 82. The second guide member 15 is also correspondingly arranged in the two guide grooves 821.

[0050] like Figure 11As shown, a second sliding member through hole 822 is provided on the second sliding member 82 along the axial direction of the second sliding member 82, and the second sliding member through hole 822 is for the pull rope and electrode wire 108 to pass through.

[0051] like Figure 1 , Figure 2 , Figure 3 , Figure 4 as well as Figure 8 As shown, the present invention also discloses an ablation system, including an ablation catheter 100. The ablation catheter 100 includes an outer tube 101, an inner tube 102 coaxially arranged, and two pull wires 103. The distal end of the ablation catheter 100 is also provided with a basket 104. The connection relationship between the basket 104, the outer tube 101, and the inner tube 102 is generally such that the distal end of the basket 104 is fixedly connected to the distal end of the inner tube 102, and the proximal end of the basket 104 is fixed to the distal end of the outer tube 101. The fixing method is prior art and will not be specifically described here. The inner tube 102 is disposed in the outer tube 101 and the two can move axially relative to each other. The lumen of the inner tube 102 can pass through a guide wire. A through cavity 105 is provided between the inner tube 102 and the outer tube 101 to inject liquid. The aforementioned catheter adjustment handle is provided at the proximal end of the ablation catheter 100.

[0052] In this invention, the outer tube 101 of the ablation catheter 100 is fixed and cannot move axially, while the outer tube 102 moves axially through a diameter adjustment mechanism, so that the diameter of the basket 104 can be adjusted.

[0053] The ablation system of the present invention can have the following combinations:

[0054] like Figure 4 As shown, when the catheter adjustment handle is only equipped with a diameter adjustment mechanism, the proximal end of the ablation catheter 100 can be inserted into the handle body 1 through the catheter insertion port 2, and the proximal end of the outer tube 101 can be fixed in the cavity of the handle body 1. The proximal end of the inner tube 102 can be passed through the fixing slot 421 and then extended out of the handle body 1 through the outlet 3. The electrode wire 108 of the ablation catheter is led out from the wire outlet 6 and electrically connected to the electrical connector 109 so as to realize the connection with the connector at the device end, complete the transmission of electrical signals, and realize the functions of ablation, mapping and other functions.

[0055] When a first guide member 5 is also provided in the handle body 1, such as Figure 4 As shown, after passing through the first limiting member 42, the proximal end of the inner tube 102 extends from the outlet 3 to the outside of the handle body 1 through the first guide member through hole 51 of the first guide member 5, so that when the first guide member 5 drives the inner tube 102 to move axially, the inner tube 102 can move more smoothly.

[0056] When further provided with a fixed base 7 and a side arm 75, such as Figure 8As shown, the proximal end of the outer tube 101 passes through the catheter insertion port 2 and is inserted into the cavity of the handle body 1, then fixed in the first fixing seat through hole 72. The inner tube 102 passes through the fixing seat 7, the fixing through groove 421, and the first guide through hole 51 in sequence, and then extends out of the handle body 1 from the insertion port 3. A Luer connector may be provided on the proximal end of the inner tube 102. When the inner tube 102 passes through the second fixing seat through hole 73 on the fixing seat 7, it also passes through the hemostatic valve 74.

[0057] Because there is a cavity between the outer tube 101 and the inner tube 102, after the outer tube 101 is fixed in the through hole 72 of the first fixing seat, the cavity communicates with the cavity 71 of the fixing seat. When liquid is input from the side arm 75, it can flow out from the distal end of the ablation catheter 100 through the cavity.

[0058] like Figure 8 As shown, the outer tube 101 in this invention can be composed of two layers of tube walls, or it can be composed of only one layer. When it is composed of two layers of tube walls, the proximal end of the inner tube wall in the outer tube 101 extends from the proximal end of the outer tube wall of the outer tube 101. The first fixing seat through hole 72 is set as a stepped hole, thereby fixing the two sides of the outer tube 101.

[0059] like Figure 9 and Figure 10 As shown, when the aforementioned catheter adjustment handle is further equipped with a bending mechanism 8, one of the two pull wires 103 on the inner tube 102 is set to be longer than the other pull wire. For ease of understanding, these two pull wires are named long pull wire 106 and short pull wire 107. The long pull wire is passed around from the proximal end of the pulley 83 and connected to the proximal end of the second sliding member 82. The short pull wire 107 can be directly connected to the proximal or distal end of the second sliding member 82. When the adjustment member 81 is rotated, the two pull wires are pulled during the axial movement of the second sliding member 82, thereby adjusting the bending direction and curvature of the distal end of the ablation catheter 100.

[0060] like Figure 10 As shown, the second sliding member 82 may also be provided with a sliding member through hole 821, through which the electrode wire 108 passes.

[0061] When not in use, the first sliding member 41 of the diameter adjustment mechanism 4 is located in the middle position of the first slide groove 11 (neutral state), the inner tube is in a straight state (i.e., no bending occurs), and the rotating adjustment member 81 of the bending adjustment mechanism 8 is in the neutral state, and both pull lines are in a relaxed state.

[0062] During operation, when the first sliding member 41 is pushed towards the distal end of the handle body 1, it causes the inner tube 102 to move axially towards the distal end of the handle body 1, reducing the diameter of the basket 103 and enabling the basket 103 to contract. When the first sliding member 41 is pulled back towards the proximal end of the handle body 1, it causes the inner tube 102 to move axially towards the proximal end of the handle body 1, increasing the diameter of the basket 103 and enabling the basket 103 to expand. The contents of the ablation catheter 100 (through the side tube 21) are then directed to the cavity 105 of the ablation catheter 100. Figure 8 Liquid is injected into the ablation catheter 100 (as shown), allowing the liquid to flow out from the distal end of the ablation catheter 100.

[0063] When it is necessary to adjust the curvature and direction of the distal end of the ablation catheter, rotate the rotary adjustment member 81 clockwise to move the second sliding member 82 axially toward the proximal end of the handle body 1, and bend the distal end of the ablation catheter 100 toward the side of the short pulling line 107 by pulling the short pulling line 107; or rotate the rotary adjustment member 81 counterclockwise to move the second sliding member 82 axially toward the distal end of the handle body 1, and bend the distal end of the ablation catheter 100 toward the side of the long pulling line 106 by pulling the long pulling line 106.

[0064] In this invention, the outer tube 101 and / or inner tube 102 of the ablation catheter 100 may be made to gradually decrease in hardness from the proximal end to the distal end of the ablation catheter in order to achieve torsion of the ablation catheter 100.

[0065] A Y-type hemostatic valve can be installed on the Luer connector to prevent air from entering the inner tube 102.

[0066] This invention allows the operator to easily adjust the diameter of the basket and the bend of the ablation catheter with one hand, enabling the operator to complete the operation independently and greatly reducing the manpower burden on the surgical site.

Claims

1. A catheter adjustment handle, comprising a handle body (1), characterized in that: The handle body (1) has an internal cavity. A catheter insertion port (2) for inserting an ablation catheter is provided at the distal end of the handle body (1) to fix the ablation catheter within the handle body (1). An outlet port (3) is provided on the handle body (1) for the inner tube of the ablation catheter to pass through. A Luer connector is provided at the proximal end of the inner tube. An adjustment mechanism (4) is provided on the handle body (1). The adjustment mechanism (4) pushes the inner or outer tube of the ablation catheter to move axially, thereby adjusting the direction of the basket at the distal end of the ablation catheter. The diameter is adjusted by means of a first sliding member (41), a first limiting member (42), and a second limiting member (43). A first groove (11) is provided on the outer wall of the handle body (1) along the axial direction of the handle body (1). The first limiting member (42) is located in the cavity of the handle body (1). The connecting part of the first sliding member (41) passes through the first groove (11) and extends into the cavity of the handle body (1) and is connected and fixed to the first limiting member (42). The component (42) is provided with a fixing groove (421) for fixing the inner tube of the ablation catheter, so that the inner tube of the ablation catheter passes through the fixing groove (421) and is fixed thereto, so that the first sliding component (41) drives the first limiting component (42) to drive the inner tube of the ablation catheter to move axially; the second limiting component (43) is fixed in the cavity of the handle body (1), and the second limiting component (43) is provided with a second sliding groove (431) arranged along the axial direction of the handle body (1), and the first limiting component (42) is fixed in the cavity of the handle body (1). The first limiting member (41) is set in the second slide groove (431) and can move back and forth in the second slide groove (431) to guide the first limiting member (42); the first limiting member (42) is provided with a pressure plate (422) on one side of the fixed through groove (421), and a pressure cover (424) is provided on the pressure plate (422). When the pressure cover (424) is placed on the first limiting member (42), the resistance of the first sliding member (41) is adjusted by adjusting the clamping force between the pressure plate (422) and the first limiting member (42).

2. The catheter adjustment handle according to claim 1, characterized in that: The pressure cap (424) is n-shaped and has a through groove (426). The pressure cap (424) covers the first limiting member (42) through the through groove (426) and presses the pressure plate (422) on the first limiting member (42). The two ends of the pressure cap (424) are fixed on the second limiting member (43). The pressure plate (422) is provided with an adjustment screw (423) that cannot be removed. The pressure cap (424) is provided with an adjustment screw hole (425). The adjustment screw (423) is threadedly connected to the adjustment screw hole (425) so that when the adjustment screw (423) is turned, the pressure plate (422) can move along the axial direction of the adjustment screw hole (425).

3. The catheter adjustment handle according to claim 2, characterized in that: The handle body (1) has a fixing seat (7) in its cavity. The fixing seat (7) is fixed in the handle body (1). The fixing seat (7) has a fixing seat cavity (71). A first fixing seat through hole (72) communicating with the fixing seat cavity (71) is provided on the end of the fixing seat (7) opposite to the catheter insertion port (2) so as to fix the outer tube of the ablation catheter in the first fixing seat through hole (72). A second fixing seat through hole (73) communicating with the fixing seat cavity (71) is provided on the proximal end face of the fixing seat (7) so as to allow the inner tube of the ablation catheter to pass through the fixing seat (7). A hemostatic valve (74) is provided on the side of the fixing seat cavity (71) located at the second fixing seat through hole (72).

4. The catheter adjustment handle according to claim 3, characterized in that: The fixed base (7) is also provided with a tubular side arm (75), which extends from the hole on the handle body (1) to the outside of the handle body (1), and a three-way valve (76) is connected on the side arm (75).

5. The catheter adjustment handle according to any one of claims 1-4, characterized in that: The handle body (1) is also provided with a bending mechanism (8), which includes a rotary adjustment member (81) and a second sliding member (82). The rotary adjustment member (81) is rotatably fixed in the cavity of the handle body (1). A rotating window (12) is provided on the outer wall of the handle body (1) at the position of the rotary adjustment member (81) to expose part of the rotary adjustment member (81). The outer wall of the second sliding member (82) is provided with threads, and the rotary adjustment member (81) is provided with an adjustment member through which the second sliding member (82) passes. The through hole (811) and the through hole (811) of the adjustment component are threaded holes to achieve threaded connection with the second sliding component (82). A second guide component (15) is provided in the cavity of the handle body (1). An axially arranged guide groove (821) is provided on the second sliding component (82). The second guide component (15) is located in the guide groove (821). When the rotating adjustment component (81) is rotated in the rotating window (12), the second sliding component (82) is driven to move axially to pull the two pull wires of the ablation catheter to adjust the curvature of the distal end of the ablation catheter.

6. The catheter adjustment handle according to claim 5, characterized in that: The handle body (1) has a first guide (5) in its cavity. One end of the first guide (5) is connected to the outlet (3). The first guide (5) has a first guide through hole (51) which is connected to the outlet (3) so that the inner tube extends out of the handle body (1) through the outlet (3) via the first guide through hole (51).

7. The catheter adjustment handle according to claim 6, characterized in that: The handle body (1) is also provided with a wire outlet (6) so that the electrode wire of the ablation catheter can be led out from the wire outlet (6) and electrically connected to the electrical connector.

8. An ablation system comprising an ablation catheter (100), characterized in that: It also includes a catheter adjustment handle as described in any one of claims 1-7. The ablation catheter (100) includes an outer tube (101), an inner tube (102) coaxially arranged, and two pull wires (103). The inner tube (102) is located in the outer tube (101) and the two can move axially relative to each other. There is a through cavity between the inner tube (102) and the outer tube (101). The outer tube (101) is fixed in the cavity of the handle body (1). The inner tube (102) is driven by the diameter adjustment mechanism to move axially in the outer tube (101), thereby adjusting the diameter of the basket located at the distal end of the ablation catheter (100).

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