Two-way bending-adjustable vascular intervention catheter

Abstract

The utility model discloses a bidirectional bending-adjustable vascular intervention catheter which comprises a bending-adjustable catheter, a handle and two pull wires, an anchoring piece is fixed in the catheter wall of one end of the bending-adjustable catheter in a melting mode, and the other end of the bending-adjustable catheter is installed in the handle. One ends of the two pull wires are connected with the two sides of the anchoring part respectively, the other ends of the two pull wires penetrate into the handle through two channels formed in the bending adjusting guide pipe respectively, the pull wire structure is used for pulling the other ends of the two pull wires, the pull wire structure comprises a sliding block, a guide block, a rotary knob and a limiting structure, and the sliding block is connected with the guide block. The sliding block can be installed in the handle in a front-back sliding mode, the guide block is arranged on the rear side of the sliding block, and the other end of one pull wire is connected with one side of the sliding block. The catheter bending adjusting device is easy to operate and low in cost, the catheter bending adjusting angle can be controlled by rotating and twisting turns, accuracy is high, operation wound risks are reduced, and safety is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a bidirectionally adjustable vascular intervention catheter. Background Art

[0002] The vascular interventional bending catheter is a medical device widely used in the field of intervention. It is designed to perform precise operations in blood vessels, such as catheter positioning, angiography, balloon dilatation, stent implantation, etc. The existing bending catheter is generally composed of a catheter, a pull wire anchor, a pull wire and a handle. The pull wire anchor and the pull wire are pre-buried in the catheter. One end of the pull wire is connected to the pull wire anchor and the other end is connected to the handle. The handle provides tension. When the pull wire is pulled, the catheter will bend.

[0003] Existing types of bending catheters include electric, thermal effect and magnetic catheters, hydraulic chamber force-conducting catheters, and pre-shaped catheters. Electric, thermal effect and magnetic catheters achieve bending through motors, thermal deformation or magnetic force. They can provide precise control, but may increase the complexity and cost of the catheter, and may require additional equipment to operate. Hydraulic chamber force-conducting catheters use liquid pressure to achieve bending. Although they can provide strong force, there may be a risk of leakage, and the system as a whole may be more complex. Pre-shaped catheters need to be pre-shaped before surgery, cannot be bent during surgery, and require the catheter to have a certain wall thickness, which increases surgical trauma. Summary of the invention

[0004] In view of the above problems existing in the existing catheters, the present invention aims to provide a bidirectionally adjustable vascular intervention catheter which is simple to operate, highly safe, highly accurate and bidirectionally adjustable.

[0005] The specific technical solutions are as follows:

[0006] A bidirectionally adjustable vascular intervention catheter comprises a bending-adjusting catheter, a handle and two pull wires, wherein an anchor is melted and fixed in the tube wall of one end of the bending-adjusting catheter, and the other end is installed in the handle, one end of the two pull wires is respectively connected to the two sides of the anchor, and the other end is respectively passed through two channels provided in the bending-adjusting catheter to pass into the handle, and further comprises: a pull wire structure for pulling the other ends of the two pull wires, and the pull wire structure comprises:

[0007] A slider, the slider being slidably mounted in the handle;

[0008] A guide block, wherein the guide block is arranged at the rear side of the slider, wherein the other end of one of the pull wires is connected to one side of the slider, and the other side of the other pull wire moves through the other side of the slider and the guide block is connected to one side of the slider in sequence;

[0009] A knob, the knob is rotatably mounted on the handle and sleeved on the outside of the slider, and a linkage is provided between the knob and the slider, when the knob is rotated, the knob drives the slider to slide in the front-rear direction through the linkage to pull the two pull wires, and when the slider slides backward, the slider pulls the other end of one pull wire backward, the anchor is subjected to force to one side, and the other pull wire is passively stretched to make one end of the bending catheter bend to one side, and when the slider slides forward, the slider pulls the other end of the other pull wire forward, the anchor is subjected to force to the other side, and the one pull wire is passively stretched to make one end of the bending catheter bend to the other side;

[0010] A limiting structure is provided between the knob and the handle, and is used to limit the rotation of the knob.

[0011] As a further improvement and optimization of the present solution, the linkage comprises a spiral groove coaxially arranged on the inner wall of the knob and at least one protrusion arranged on the slider, the protrusion being slidably arranged in the spiral groove, and when the knob is rotated, the protrusion slides in the spiral groove to cause the slider to slide in the front-rear direction.

[0012] As a further improvement and optimization of the present solution, a limit sleeve is provided in the handle, the limit sleeve is coaxially sleeved in the knob, and at least one guide groove connected to the interior of the limit sleeve is provided on the limit sleeve along the front-to-back direction, the slider is movably arranged in the limit sleeve, and the protrusion passes through the guide groove and extends into the spiral slide groove, and forms a sliding fit with the guide groove along the front-to-back direction.

[0013] As a further improvement and optimization of this solution, the limiting structure includes:

[0014] A limiting sliding sleeve, the limiting sliding sleeve is arranged outside the limiting sleeve and is located on a side of the knob away from the guide block, the rear side of the limiting sliding sleeve has a latching tooth, and the front side of the knob is ringed with a rack;

[0015] At least one push button is connected to the outer wall of the limiting sleeve, and the handle is provided with a limiting groove. The push button extends through the limiting groove to the outside of the handle and forms a sliding fit with the limiting groove along the front-to-back direction. When the push button is pushed backward and the latch tooth is engaged with the rack, the knob is circumferentially limited. When the push button is pushed forward and the latch tooth is disengaged from the rack, the knob is released from the circumferential limit.

[0016] As a further improvement and optimization of the present solution, the handle is provided with at least one opening, the outside of the knob is provided with a rotating wheel, and at least a portion of the outer circumferential surface of the rotating wheel extends to the outside of the handle through the opening.

[0017] The slider has an upper through hole and a lower through hole, and the guide block has an upper through hole coaxial with the upper through hole and a lower through hole coaxial with the lower through hole. The other end of one of the pull wires is connected to the upper through hole, and the other end of the other pull wire passes through the lower through hole and the lower through hole in sequence, and passes through the side of the guide block away from the slider and is connected to the upper through hole through the upper through hole. As a further improvement and optimization of this solution, one side of the slider has a threaded hole that passes through the upper through hole, and a fixing screw is installed in the threaded hole to tighten the other ends of the two pull wires.

[0018] As a further improvement and optimization of the present solution, the two ends of the limit sleeve are respectively provided with at least one positioning column, the two sides of the handle are respectively provided with at least one positioning groove, and the two positioning columns are respectively positioned and matched with the two positioning grooves.

[0019] As a further improvement and optimization of this solution, the limiting sleeve also has a through groove penetrating the limiting sleeve, and the handle also has a fixing groove, and the guide block is positioned and installed in the through groove and the fixing groove.

[0020] As a further improvement and optimization of the present solution, the front end of the handle is provided with a stress diffusion sleeve, and the rear end of the handle is installed with a catheter base, one end of the catheter base is located inside the handle, and the other end extends to the outside of the handle, and a connecting hole is penetrated through the catheter base in the front-to-back direction, one end of the bending adjustment catheter passes through the stress diffusion sleeve, the slider, and the guide block in sequence and is connected to one end of the connecting hole, a sealing cover is installed on the external thread of the catheter base for sealing the other end of the connecting hole, and sealing silicone is also provided between the sealing cover and the catheter base.

[0021] Compared with the prior art, the above technical solution has the following positive effects:

[0022] (1) In the utility model, by turning the knob, the transmission member is used to convert the rotational torque of the knob into the forward and backward sliding power of the slider, and the slider is driven to slide forward or backward by the forward and reverse rotation of the twist. When the slider slides backward, the slider pulls the other end of a pull wire backward, the anchor member is subjected to force to one side, and the other pull wire is passively stretched, so that the anchor member bends one end of the bending catheter to one side. When the slider slides forward, the slider pulls the other end of the other pull wire forward, the anchor member is subjected to force to the other side, and the pull wire is passively stretched, so that one end of the bending catheter is bent to the other side, thereby realizing two-way bending of the bending catheter. Not only is the operation simple and the cost low, but the bending angle of the catheter can be controlled by the number of twisting circles, with high precision, reduced surgical trauma risk, and improved safety.

[0023] (2) In the present invention, after the bending angle of the bending catheter is adjusted, the knob can be circumferentially limited by a limiting structure to prevent the knob from rotating and affecting the accuracy of the surgical operation, thereby further improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic structural diagram of a bidirectionally adjustable vascular intervention catheter of the utility model;

[0025] Figure 2 It is a cross-sectional view of a bidirectionally adjustable vascular intervention catheter of the utility model;

[0026] Figure 3 This is a diagram showing the coordination of two pull wires and a bending-adjusting catheter of a bidirectionally adjustable vascular intervention catheter of the utility model;

[0027] Figure 4 It is an exploded schematic diagram of a bidirectionally adjustable vascular intervention catheter of the utility model;

[0028] Figure 5 It is a schematic diagram of the meshing of a rack and a latching tooth of a bidirectionally adjustable vascular intervention catheter of the utility model;

[0029] Figure 6 This is a diagram showing the coordination between two pull wires, a slider and a guide block of a bidirectionally adjustable vascular intervention catheter of the utility model;

[0030] In the accompanying drawings: 1. handle; 2. bending catheter; 3. knob; 4. stress diffusion sleeve; 5. sealing cover; 6. slider; 7. limit sleeve; 8. limit sleeve; 9. guide block; 10. catheter base; 20. pull wire; 11. positioning groove; 12. opening; 13. fixing groove; 21. anchor; 31. spiral slide groove; 32. rotating wheel; 33. rack; 61. protrusion; 62. upper through hole; 63. fixing screw; 64. lower through hole; 71. positioning column; 72. tail section; 73. head section; 721. guide groove; 722. through groove; 81. push button; 82. latch tooth; 91. upper through hole; 92. lower through hole; 101. connecting hole; 102. sealing silicone. DETAILED DESCRIPTION

[0031] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] In the description of the present invention, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, if the terms "first", "second", "third" appear, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Figure 1 This is a schematic diagram of the structure of a bidirectionally adjustable vascular intervention catheter of the utility model. Figure 2 This is a cross-sectional view of a bidirectionally adjustable vascular intervention catheter of the utility model. Figure 3 This is a diagram of the coordination of two pull wires and the bending-adjusting catheter of a bidirectionally adjustable vascular intervention catheter of the utility model. Figure 4This is an exploded schematic diagram of a bidirectionally adjustable vascular intervention catheter of the utility model. Figure 5 This is a schematic diagram of the meshing of a rack and a latching tooth of a bidirectionally adjustable vascular intervention catheter of the utility model. Figure 6 This is a diagram showing the coordination between two pull wires, a slider and a guide block of a bidirectionally adjustable vascular intervention catheter of the utility model, as shown in FIG. Figure 1-6 As shown, a preferred embodiment is shown.

[0035] A bidirectionally adjustable vascular intervention catheter comprises a bending catheter 2, a handle 1 and two pull wires 20, wherein an anchor 21 is melted and fixed in the tube wall of one end of the bending catheter 2, and the other end is installed in the handle 1, one end of the two pull wires 20 is respectively connected to the two sides of the anchor 21, and the other end is respectively passed through two channels provided in the bending catheter 2 to pass into the handle 1, and further comprises: a pull wire 20 structure for pulling the other end of the two pull wires 20, the pull wire 20 structure comprises a slider 6, a guide block 9, a knob 3 and a limiting structure, the slider 6 can be slidably installed in the handle 1 forward and backward, the guide block 9 is provided at the rear side of the slider 6, the other end of one pull wire 20 is connected to one side of the slider 6, and the other side of the other pull wire 20 moves in sequence through the other side of the slider 6, the guide block 9 and the slider 6 One side of the knob 3 is rotatably mounted on the handle 1 and is sleeved on the outside of the slider 6, and a linkage is provided between the knob 3 and the slider 6. When the knob 3 is rotated, the knob 3 drives the slider 6 to slide in the front-to-back direction through the linkage to pull the two pull wires 20, and when the slider 6 slides backward, the slider 6 pulls the other end of a pull wire 20 backward, and the anchor 21 is subjected to force to one side and passively stretches the other pull wire. The anchor 21 bends one end of the bending catheter 2 to one side. When the slider 6 slides forward, the slider 6 pulls the other end of the other pull wire 20 forward, and the anchor 21 is subjected to force to the other side and passively stretches a pull wire 20 to bend one end of the bending catheter 2 to the other side. A limiting structure is provided between the knob 3 and the handle 1 to limit the rotation of the knob 3.

[0036] In this embodiment, by rotating the knob 3, the transmission member is used to convert the rotational torque of the knob 3 into the forward and backward sliding power of the slider 6, and the slider 6 is driven to slide forward or backward through the forward and reverse rotation of the twisting. When the slider 6 slides backward, the slider 6 pulls the other end of a pull wire 20 backward, the anchor 21 is subjected to force to one side, and the other pull wire is passively stretched. The anchor 21 bends one end of the bending catheter 2 to one side. When the slider 6 slides forward, the slider 6 pulls the other end of the other pull wire 20 forward, the anchor 21 is subjected to force to the other side, and the pull wire 20 is passively stretched to bend one end of the bending catheter 2 to the other side, thereby realizing two-way bending of the bending catheter 2. It is not only simple to operate and low in cost, but also the bending angle of the catheter can be controlled by the number of twisting circles, with high precision, reduced surgical trauma risk, and improved safety.

[0037] In this embodiment, after the bending angle of the bending catheter 2 is adjusted, the knob 3 can be circumferentially limited by a limiting structure to prevent the knob 3 from rotating on its own, thereby affecting the accuracy of the surgical operation and further improving safety.

[0038] Furthermore, as a preferred embodiment, the linkage includes a spiral groove 31 coaxially arranged on the inner wall of the knob 3 and at least one protrusion 61 arranged on the slider 6, and the protrusion 61 is slidably arranged in the spiral groove 31. When the knob 3 is rotated, the protrusion 61 slides in the spiral groove 31 to make the slider 6 slide in the front and rear directions.

[0039] Further, as a preferred embodiment, the handle 1 has a limit sleeve 7, the limit sleeve 7 is coaxially sleeved in the knob 3, and the limit sleeve 7 is provided with at least one guide groove 721 connected to the inside of the limit sleeve 7 along the front-to-back direction, the slider 6 is movably arranged in the limit sleeve 7, and the protrusion 61 passes through the guide groove 721 and extends into the spiral slide groove 31, and forms a sliding fit with the guide groove 721 along the front-to-back direction.

[0040] Further, as a preferred embodiment, the limiting structure includes a limiting sleeve 8 and at least one push button 81. The limiting sleeve 8 is slidingly arranged on the outside of the limiting sleeve 7 and is located on the side of the knob 3 away from the guide block 9. The rear side of the limiting sleeve 8 has a latch tooth 82, and the front side ring of the knob 3 is provided with a rack 33. The push button 81 is connected to the outer wall of the limiting sleeve 8, and the handle 1 has a limiting groove. The push button 81 extends through the limiting groove to the outside of the handle 1 and forms a sliding fit with the limiting groove along the front and rear directions. When the push button 81 is pushed backward and the latch tooth 82 is engaged with the rack 33, the knob 3 is circumferentially limited. When the push button 81 is pushed forward and the latch tooth 82 is disengaged from the rack 33, the knob 3 is released from the circumferential limit.

[0041] Furthermore, as a preferred embodiment, in order to facilitate the rotation of the knob 3 , the handle 1 has at least one opening 12 , the outside of the knob 3 has a rotating wheel 32 , and at least a portion of the outer circumference of the rotating wheel 32 extends to the outside of the handle 1 through the opening 12 .

[0042] Furthermore, as a preferred embodiment, in order to improve the stability of the movement routes of the two pull wires 20 and increase the precise control of the bending angle of the bending tube 2, the slider 6 has an upper through hole 62 and a lower through hole 64, and the guide block 9 has an upper through hole 91 coaxial with the upper through hole 61 and a lower through hole 92 coaxial with the lower through hole 64. The other end of one pull wire 20 is connected to the upper through hole 62, and the other end of the other pull wire 20 passes through the lower through hole 64 and the lower through hole 92 in turn, and passes through the upper through hole 91 on the side of the guide block 9 away from the slider 6 to be connected to the upper through hole 62.

[0043] Furthermore, as a preferred embodiment, one side of the slider 6 has a threaded hole penetrating the upper through hole 62 , and a fixing screw 63 is installed in the threaded hole for tightening the other ends of the two pull wires 20 to facilitate the connection of the other ends of the two pull wires 20 .

[0044] Furthermore, as a preferred embodiment, the two ends of the limit sleeve 7 are respectively provided with at least one positioning column 71, and the two sides in the handle 1 are respectively provided with at least one positioning groove 11, and the two positioning columns 71 are respectively positioned and matched with the two positioning grooves 11, which not only makes it convenient to disassemble and assemble the limit sleeve 7, but also utilizes the limit sleeve 7 to be precisely positioned in the handle 1, effectively preventing the limit sleeve 7 from being displaced and affecting the precise angle of the bending adjustment catheter 2 pulled by the pull wire 20.

[0045] Furthermore, as a preferred embodiment, the limiting sleeve 7 also has a through groove 722 penetrating the limiting sleeve 7, and the handle 1 also has a fixing groove 13. The guide block 9 is positioned and installed in the through groove 722 and the fixing groove 13, further improving the installation stability of the slider 6.

[0046] Preferably, the limiting sleeve 7 includes a first section 73 and a tail section 72 which are connected to each other, and the first section 73 and the tail section 72 are connected by a snap-fit ​​structure, and the through groove 722 and the guide groove 721 are both provided on the tail section 72 .

[0047] Further, as a preferred embodiment, the front end of the handle 1 has a stress diffusion sleeve 4, and the rear end of the handle 1 is installed with a catheter base 10, one end of the catheter base 10 is located inside the handle 1, and the other end extends to the outside of the handle 1, and a connecting hole 101 is penetrated through the catheter base 10 in the front-to-back direction, one end of the bending catheter 2 passes through the stress diffusion sleeve 4, the slider 6, and the guide block 9 in sequence and is connected to one end of the connecting hole 101, and a sealing cover 5 is installed on the external thread of the catheter base 10 for sealing the other end of the connecting hole 101, and a sealing silicone 102 is also provided between the sealing cover 5 and the catheter base 10.

[0048] The above description is only a preferred embodiment of the present invention, and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A bidirectionally adjustable vascular intervention catheter, comprising a bending-adjusting catheter, a handle and two pull wires, wherein an anchor is melted and fixed in the tube wall of one end of the bending-adjusting catheter, and the other end is installed in the handle, one end of the two pull wires is respectively connected to the two sides of the anchor, and the other end is respectively passed through two channels provided in the bending-adjusting catheter to the handle, characterized in that: Also includes: A pull wire structure, used to pull the other ends of the two pull wires, the pull wire structure comprising: A slider, the slider being slidably mounted in the handle; A guide block, wherein the guide block is arranged at the rear side of the slider, wherein the other end of one of the pull wires is connected to one side of the slider, and the other side of the other pull wire moves through the other side of the slider and the guide block is connected to one side of the slider in sequence; A knob, the knob is rotatably mounted on the handle and sleeved on the outside of the slider, and a linkage is provided between the knob and the slider, when the knob is rotated, the knob drives the slider to slide in the front-rear direction through the linkage to pull the two pull wires, and when the slider slides backward, the slider pulls the other end of one pull wire backward, the anchor is subjected to force to one side, and the other pull wire is passively stretched to make one end of the bending catheter bend to one side, and when the slider slides forward, the slider pulls the other end of the other pull wire forward, the anchor is subjected to force to the other side, and the one pull wire is passively stretched to make one end of the bending catheter bend to the other side; A limiting structure is provided between the knob and the handle, and is used to limit the rotation of the knob.

2. The bidirectionally adjustable vascular intervention catheter according to claim 1, characterized in that: The linkage comprises a spiral groove coaxially arranged on the inner wall of the knob and at least one protrusion arranged on the slider, wherein the protrusion is slidably arranged in the spiral groove, and when the knob is rotated, the protrusion slides in the spiral groove to make the slider slide in the front-rear direction.

3. The bidirectionally adjustable vascular intervention catheter according to claim 2, characterized in that: The handle is provided with a limit sleeve, which is coaxially sleeved in the knob, and the limit sleeve is provided with at least one guide groove connected with the interior of the limit sleeve along the front-to-back direction. The slider is movably arranged in the limit sleeve, and the protrusion passes through the guide groove and extends into the spiral slide groove, and forms a sliding fit with the guide groove along the front-to-back direction.

4. The bidirectionally adjustable vascular intervention catheter according to claim 3, characterized in that: The limiting structure comprises: A limiting sliding sleeve, the limiting sliding sleeve is arranged outside the limiting sleeve and is located on a side of the knob away from the guide block, the rear side of the limiting sliding sleeve has a latching tooth, and the front side of the knob is ringed with a rack; At least one push button is connected to the outer wall of the limiting sleeve, and the handle is provided with a limiting groove. The push button extends through the limiting groove to the outside of the handle and forms a sliding fit with the limiting groove along the front-to-back direction. When the push button is pushed backward and the latch tooth is engaged with the rack, the knob is circumferentially limited. When the push button is pushed forward and the latch tooth is disengaged from the rack, the knob is released from the circumferential limit.

5. The bidirectionally adjustable vascular intervention catheter according to claim 1, characterized in that: The handle is provided with at least one opening, the outside of the knob is provided with a rotating wheel, and at least a part of the outer circumferential surface of the rotating wheel extends to the outside of the handle through the opening.

6. The bidirectionally adjustable vascular intervention catheter according to claim 1, characterized in that: The slider is provided with an upper through hole and a lower through hole, the guide block is provided with an upper through hole coaxial with the upper through hole and a lower through hole coaxial with the lower through hole, the other end of one pull wire is connected to the upper through hole, the other end of the other pull wire passes through the lower through hole and the lower through hole in sequence, and passes through the side of the guide block away from the slider and is connected to the upper through hole through the upper through hole.

7. The bidirectionally adjustable vascular intervention catheter according to claim 6, characterized in that: One side of the sliding block is provided with a threaded hole penetrating the upper through hole, and a fixing screw is installed in the threaded hole for pressing the other ends of the two pulling wires.

8. The bidirectionally adjustable vascular intervention catheter according to claim 3, characterized in that: Both ends of the limiting sleeve are respectively provided with at least one positioning column, and both sides of the handle are respectively provided with at least one positioning groove, and the two positioning columns are respectively positioned and matched with the two positioning grooves.

9. The bidirectionally adjustable vascular intervention catheter according to claim 8, characterized in that: The limiting sleeve is also provided with a through slot which penetrates the limiting sleeve, and the handle is also provided with a fixing slot, and the guide block is positioned and installed in the through slot and the fixing slot.

10. The bidirectionally adjustable vascular intervention catheter according to claim 1, characterized in that: The front end of the handle is provided with a stress diffusion sleeve, and the rear end of the handle is provided with a catheter base, one end of the catheter base is located inside the handle, and the other end extends to the outside of the handle, and a connecting hole is penetrated through the catheter base in the front-to-back direction, one end of the bending adjustment catheter passes through the stress diffusion sleeve, the slider, and the guide block in sequence and is connected to one end of the connecting hole, a sealing cover is installed on the external thread of the catheter base for sealing the other end of the connecting hole, and sealing silicone is also provided between the sealing cover and the catheter base.

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