CN116712111A - A kind of left bundle branch guide sheath - Google Patents

Abstract

The invention provides a left bundle branch guide sheath, which belongs to the field of medical appliances, and comprises a tearable sheath tube and a bending control member for controlling bending of the tearable sheath tube, wherein the tearable sheath tube comprises a tube body and a bending control ring embedded into the tube body; four through cavities which are axially communicated are formed in the circumferential direction of the pipe wall, wherein two through cavities which are arranged at intervals are a first group of through cavities, and the other two through cavities which are arranged at intervals are a second group of through cavities; the bending control component comprises a first group of bending control wires and a second group of bending control wires, and one ends of the bending control wires are connected with the bending control ring; the bending control system further comprises a first component capable of controlling the first group of bending control wires and a second component capable of controlling the second group of bending control wires; the first component and the second component can bend the pipe body towards the direction where the bending control wire is located by pulling the corresponding bending control wire. The left bundle branch guide sheath can guide the pacemaker electrode from the subclavian vein into the right atrium, through the tricuspid annulus and to the designated left bundle branch region.

Description

A kind of left bundle branch guide sheath

Technical field

The invention belongs to the technical field of medical devices, and specifically relates to a left bundle branch introducing sheath.

Background technique

In recent years, the incidence of cardiovascular disease in our country has been on the rise, with tens of millions of patients diagnosed every year, and a large number of patients with arrhythmias need to install pacemakers. Left bundle branch regional pacing (LBBaP) is a new and more attractive physiological pacing method that has emerged in recent years. It can quickly capture the special conduction system to achieve rapid stimulation of the left and right ventricles, thereby achieving the purpose of cardiac electrical-mechanical synchronization. .

Left bundle branch regional pacing: via intravenous approach, twist the wire deeply through the septum from the right ventricular septal surface to the left bundle branch area under the left ventricular septal surface, and capture the left bundle branch main trunk or left anterior and left posterior branches for pacing or the more distal left Purkinje fiber network, reaching across the block site and maintaining left ventricular electrical synchrony. That is to say, the electrical signal conduction sequence of the normal cardiac circuit is from the sinoatrial node - internodal bundle - atrioventricular node - His bundle - left and right bundle branches - Purkinje fiber cells. When the lesion is located lower, even in the His When it is below the bundle, we place the pacing position on the left bundle branch further below the lesion to perform pacing, crossing the lesion position to achieve the purpose of physiological pacing.

The Chinese patent with publication number CN213588354U is a left bundle branch pacing electrode delivery sheath, which provides a left bundle branch pacing electrode delivery sheath that can be well applied to patients with cardiac transposition and improves the quality of such patients. therapeutic effect. However, the sheath provided by this technical solution has a small bending range and is inconvenient during operation.

Therefore, it is necessary to provide a left bundle branch guide sheath to guide the pacemaker motor from the subclavian vein into the right side, through the tricuspid annulus and to the designated left bundle branch area.

Contents of the invention

In order to solve the above problems, the object of the present invention is to propose a tearable left bundle branch guiding sheath for left bundle branch regional pacing, which can guide the pacemaker electrode from the subclavian vein into the right atrium through three After the cusp annulus reaches the designated left bundle branch area.

In order to achieve the above object, the present invention provides the following technical solution, a left bundle branch guiding sheath, the left bundle branch guiding sheath includes a tearable sheath and a control device for controlling the bending of the tearable sheath. curved member,

The tearable sheath includes a tube body and a bending control ring embedded in the tube body; the tube wall of the tube body is provided with four axially penetrating cavities along the circumferential direction, two of which are spaced apart. is the first group of through-cavities, and the other two spaced through-cavities are the second group of through-cavities;

The bending control component includes a first set of bending control wires and a second set of bending control wires. The first set of bending control wires includes two bending control wires that are threaded through the first set of through-cavities in one-to-one correspondence. The second set of bending control wires includes two other bending control wires that are threaded through the second set of through-cavities in one-to-one correspondence; one end of the four bending control wires is connected to the bending control ring;

The bending control system also includes a first component capable of controlling the first set of bending control wires and a second component capable of controlling the second set of bending control wires; the first component and the second component can be controlled by pulling the corresponding control wires. The bending wire causes the pipe body to bend toward the direction of the bending control wire.

The left bundle branch introduction sheath provided by the present invention also has the feature that the first component and the second component are one of a thread control component or a locking control component.

The left bundle branch introduction sheath provided by the present invention also has the feature that the thread control assembly includes a moving part fixedly connected with the bending control wire and a rotating part used to control the movement of the moving part,

The locking control assembly includes a bending control part fixedly connected to the bending control wire, a bending control knob for controlling the rotation of the bending control part, and a locking subassembly for limiting the position of the bending control part.

The left bundle branch introduction sheath provided by the present invention also has the following characteristics: the tube body includes a head end section, a bending control section and a main body section arranged in sequence,

The hardness of the head end section, the bending control section and the main body section increases in sequence,

The head end section is the distal end and the main body section is the proximal end. The proximal end of the main body section is provided with a gap that is convenient for tearing. The bending control ring is embedded in the distal inner wall of the bending control section. The electrode For the distal outer wall provided on the bending control section and the proximal end of the bending control ring,

The thickness of the head end section < the thickness of the bending control section, the thickness of the bending control section ≤ the thickness of the main body section,

The left bundle branch guiding sheath provided by the present invention also has the feature that an electrode pair for indicating the position of the tube body is provided on the outer wall of the tube or/and the four through-cavities are evenly arranged.

The left bundle branch introduction sheath provided by the present invention also has the feature that the rotating member is provided with a hollow cavity, and the two ends of the hollow cavity are respectively provided with a first internal thread and a second internal thread, and the third internal thread is provided with a hollow cavity. An internal thread and the second internal thread have the same pitch and opposite rotational directions,

The moving member includes a first slide block and a second slide block that can slide along an axis. The first slide block is provided with a first external thread that matches the first internal thread. The second slide block There is a second external thread matching the second internal thread, and/or

The rotating member includes a first cylinder that cooperates with the first slide block, a second cylinder that cooperates with the second slide block, and a cylinder for connecting the first cylinder and the second cylinder. barrel fixings,

The inner diameter of the first cylinder is adapted to the outer diameter of the first slider, and the inner diameter of the second cylinder is adapted to the outer diameter of the second slider.

The left bundle branch guiding sheath provided by the present invention also has the following characteristics: the first slider is provided with an eccentric hole, and the second slider is provided with a limiting rod corresponding to the eccentric hole, and / or

The number of the eccentric holes is two. The two eccentric holes are arranged symmetrically with respect to the axis and are located on the same diameter. The cross section of the eccentric hole is circular.

The left bundle branch introduction sheath provided by the present invention also has the feature that the first slider is closer to the tearable sheath relative to the second slider,

The first slider is provided with a first connection hole and a first through hole, and the second slider is provided with a second connection hole. The first connection hole is fixedly connected to the bending control wire and passes through the same group. Another bending control wire passing through the cavity passes through the first through hole and is fixedly connected to the second connection hole.

The left bundle branch introduction sheath provided by the present invention also has the following characteristics: the fixing member is a handwheel set outside the first cylinder and the second cylinder, and the inner wall of the handwheel It is connected with the outer wall of the first cylinder and the outer wall of the second cylinder through snaps, and the outer wall of the first cylinder and the outer wall of the second cylinder are both provided with position limits for position limiting. parts, the inner wall of the handwheel is provided with two slots for matching with the limiting parts, and/or

The handwheel is a spindle-shaped structure formed by two pieces of first shells connected by snaps. The outer surface of the handwheel is provided with an anti-slip structure. The two slots are respectively provided on the two pieces of first shells. on the inner wall of the body.

The left bundle branch guiding sheath provided by the present invention also has the feature that the left bundle branch guiding sheath further includes a tearing device.

Beneficial effects:

The left bundle branch guiding sheath provided by the present invention is provided with a through cavity in the wall of the sheath tube. A control bending wire is built into the through cavity. When the control bending wire is pulled at the proximal end, the distal end will bend in the direction of the through cavity. Generally, the sheath will include a bending control section with lower hardness and a main body section with higher hardness. When the bending control wire is pulled, due to the low hardness of the bending control section, it will bend first, thereby achieving controlled bending. The distance that the bending control wire can pull is basically designed to be the pulling distance required by the bending control section to complete the control bending. Therefore, during this process, the main section will not bend. This structure can guide the pacemaker electrode from the subclavian vein into the right atrium, pass through the tricuspid annulus and reach the designated left bundle branch area.

Description of the drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present disclosure and are not relevant to the present disclosure. Those skilled in the art can also obtain other drawings based on these drawings without exerting creative efforts.

Figure 1 is a schematic structural diagram of a left bundle branch introducing sheath provided by an embodiment of the present invention;

Figure 2 is an assembly structural diagram of the slider structure and thread pair in the embodiment of the present invention;

Figure 3 is a schematic diagram of the assembly structure diagram provided in Figure 2 from another angle;

Figure 4 is a cross-sectional view of the bending control assembly in the embodiment of the present invention;

Figure 5 is a cross-sectional view of the internal structure of the handwheel in the embodiment of the present invention;

Figure 6 is a schematic structural diagram of a tearer in an embodiment of the present invention;

Figure 7 is a right view of the left bundle branch introducing sheath provided by the embodiment of the present invention;

Figure 8 is a left side view of the left bundle branch introducing sheath provided by the embodiment of the present invention;

Figure 9 is a schematic structural diagram of a bending control component provided by an embodiment of the present invention;

Figure 10 is a schematic structural diagram of a locking member provided by an embodiment of the present invention;

Figure 11 is a schematic structural diagram of a second housing provided by an embodiment of the present invention.

Among them, 1: first slider; 2: second slider; 3: first cylinder; 4: second cylinder; 5: fixing piece; 6: handwheel; 7: bending control knob; 8: gap; 9: Electrode pair; 10: First side branch; 11: Second side branch; 12: First counterbore; 13: Bending control piece; 14: Locking piece; 15: Locking screw; 16: Limiting ring; 17: Locking knob; 18: Circular cone structure; 19: Cylindrical structure; 20: Hexagonal prism structure; 21: Hexagonal hole; 22: Arc channel.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and examples. However, it should be noted that these embodiments do not limit the invention. Those of ordinary skill in the art can make functional, method, or structural changes based on these embodiments. Effective transformation or substitution shall fall within the protection scope of the present invention.

In the description of the embodiments of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right" The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing this document. The invention and simplified description do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on the invention.

Furthermore, the terms “first”, “second”, “third”, etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Thus, features defined by "first," "second," etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise stated, the meaning of "plurality" is two or more.

The terms "installation", "connection" and "connection" 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. Connected, it can also be connected indirectly through an intermediary, or it can be an internal connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the creation of the present invention can be understood through specific situations.

As shown in Figures 1-8, an embodiment of the present invention provides a left bundle branch guiding sheath. The left bundle branch guiding sheath includes a tearable sheath and a bend control device for controlling the bending of the tearable sheath. The tearable sheath includes a tube body and a bending control ring embedded in the tube body; the bending control component includes a bending control wire assembly that is passed through the tube body, and a control wire assembly for controlling the bending of the bending control wire assembly. Bending system, the tearable sheath tube includes a tube body and a bending control ring embedded in the tube body, wherein the tube body includes a central through cavity for use with other instruments, such as guide wires and guide sheaths, etc., The pipe wall of the pipe body is provided with four axially penetrating through cavities along the circumferential direction, so that bending can be achieved in any direction during bending control. The four through cavities are respectively designated A, B, C and D, two of which are A, B, C and D. The two spaced through cavities are the first group of through cavities, and the other two spaced through cavities are the second group of through cavities. The first group of through cavities are A and C, and the second group of through cavities include B and D.

In some embodiments, the four through-cavities are evenly arranged, that is, A, B, C, and D are evenly arranged. In some embodiments, A, B, C, and D are all arranged adjacent to the central through-cavity, and the through-cavity The greater the distance from the outer wall, the less likely it is for the bending control wire to come out of the outer wall during the bending control process.

In some embodiments, the bending control component includes a first set of bending control wires and a second set of bending control wires, and the first set of bending control wires includes two sets of bending control wires that pass through the first set of through-cavities in a one-to-one correspondence. Root control bending wires, the second set of bending control wires include another two bending control wires passing through the second set of through-cavities in one-to-one correspondence; one end of the four bending control wires are connected to the bending control ring connect;

The four control bending wires include the first control bending wire, the second control bending wire, the third control bending wire and the fourth control bending wire. The first control bending wire is passed through the through cavity A, and the second control bending wire is passed through the through cavity A. The through-cavity B, the third control-bending wire penetrates through the through-cavity C, and the fourth control-bending wire passes through the through-cavity D.

In some embodiments, the bending control system further includes a first component capable of controlling a first set of bending control wires and a second component capable of controlling a second set of bending control wires; the first component and the second component The pipe body can be bent toward the direction of the bending control wire by pulling the corresponding bending control wire.

In some embodiments, the first component is a thread control component, the second component is a locking control component, the bending control system includes a thread control component and a locking control component, and the thread control component is used to control the penetration of the first group of through-cavities. The two control bending wires (the first control bending wire and the third control bending wire), the locking control assembly is used to control the second set of two control bending wires (the second control bending wire and the fourth control bending wire) passing through the cavity. Control wire bending).

In some embodiments, both the first component and the second component are locking control components, and the first component is used to control two control bending wires (the first control bending wire and the third control bending wire) that are passed through the first group of the cavity. bending wire), the second component is used to control the second set of two bending control wires (the second control bending wire and the fourth control bending wire) that are passed through the cavity.

In some embodiments, both the first component and the second component are thread control components, and the first component is used to control the two bending control wires (the first bending control wire and the third bending control wire) that run through the first group of the cavity. wire), the second component is used to control the second set of two bending control wires (the second control bending wire and the fourth control bending wire) that are passed through the cavity.

In some embodiments, the thread control assembly includes a moving member fixedly connected to the bending control wire and a rotating member used to control the movement of the moving member, and the locking control assembly includes a bending control member fixedly connected to the bending control wire. The bending control knob controls the rotation of the bending control part and the locking subassembly is used to limit the bending control part.

In the above embodiment, the bending control wire is built into the through cavity. When the bending control wire is pulled at the proximal end, the distal end will bend in the direction of the through cavity. Generally, the sheath will include a bending control section with lower hardness and a main body section with higher hardness. When the bending control wire is pulled, due to the low hardness of the bending control section, it will bend first, thereby achieving controlled bending. The distance that the bending control wire can pull is basically designed to be the pulling distance required by the bending control section to complete the control bending. Therefore, during this process, the main section will not bend. This structure can guide the pacemaker electrode from the subclavian vein into the right atrium, pass through the tricuspid annulus and reach the designated left bundle branch area.

In some embodiments, the pipe body includes a head end section, a bending control section and a main body section arranged in sequence. The hardness of the head end section, the bending control section and the main body section increases in sequence. The head end section If the segment is the distal end and the main body segment is the proximal end, the proximal end of the main body segment is provided with a gap 8 for easy tearing, and the bending control ring is embedded in the inner wall of the distal end of the bending control segment.

In the above embodiment, the soft head end section can make it easier for the sheath tube to pass through the blood vessel without damaging the blood vessel; the harder main body section can provide sufficient strength during the process of the sheath tube entering the blood vessel and during the bending control process. The hardness of the bending control section is smaller than the hardness of the main body section, so that during the bending control process of the sheath, when the bending control section bends due to force, the main body section can still support the bending control section.

In some embodiments, the thickness of the head end section is < the thickness of the bending control section, so as to achieve lower hardness of the head end section. The thickness of the bending control section is ≤ the thickness of the main body section to ensure the strength of the main body section and achieve torsion transmission (ie, torque transmission) and push and pull out of the sheath.

In some embodiments, the outer wall of the tube is also provided with an electrode pair 9 for indicating the position of the tube body. The electrode pair 9 is provided on the distal outer wall of the bending control section and the proximal end of the bending control ring. The electrode pair 9 can be bonded to the outer wall of the distal end for intraluminal visualization to provide a precise position for the sheath during use. There may be multiple electrode pairs 9. When there are multiple electrode pairs 9, the transmission direction of the electrical signal can be determined by the electrical signals mapped between the electrode pairs.

In some embodiments, the rotating member is provided with a hollow cavity, and first internal threads and second internal threads are respectively provided at both ends of the hollow cavity. The first internal thread and the second internal thread have the same pitch and the same rotation. To the opposite,

The moving member includes a first slide block 1 and a second slide block 2 that can slide along an axis. The first slide block 1 is provided with a first external thread that matches the first internal thread. The second slide block 2 is provided with a second external thread matching the second internal thread. The first slider 1 and the second slider 2 are coaxially arranged and eccentrically limited. Due to the two pairs of internal and external threads and the eccentric limit, the first slider 1 and the second slider 2 can only slide along the axis and cannot rotate along the axis. When the rotating member is rotated, the first slider 1 and the second slider 2 The sliders 2 move closer to or farther away from each other.

In some embodiments, the rotating member includes a first cylinder 3 that cooperates with the first slider 1, a second cylinder 4 that cooperates with the second slider 2, and a cylinder for connecting the first cylinder 3 and The fixing part 5 of the second cylinder 4, the inner diameter of the first cylinder 3 matches the outer diameter of the first slider 1, the inner diameter of the second cylinder 4 matches the outer diameter of the second slider 1 2 to match the outer diameter.

In some embodiments, the fixing member 5 is a connecting rod, one end of which is fixedly connected to the first cylinder 3 , and the other end is fixedly connected to the second cylinder 4 .

In some embodiments, the fixing member 5 is a handwheel 6 set outside the first cylinder 3 and the second cylinder 4. The inner wall of the handwheel 6 and the outer wall of the first cylinder 3 and The outer walls of the second cylinder 4 are connected by snaps. The outer walls of the first cylinder 3 and the outer walls of the second cylinder 4 are both provided with limiters for position limiting. The handwheel 6 The inner wall is provided with two slots for matching the limiting parts. The cooperation between the slot and the limiting member can drive the rotating member to rotate by rotating the handwheel, thereby causing the moving member to generate linear displacement in the axial direction.

In some embodiments, the handwheel 6 is a spindle-shaped structure formed by snap-connecting two first shells. The outer surface of the handwheel 6 is provided with an anti-skid structure. The anti-skid structure can be anti-skid textures or concave. The grooves are used to increase friction when holding the device, and the two slots are respectively provided on the inner walls of the two first shells.

In some embodiments, the first slider 1 is provided with an eccentric hole, and the second slider 2 is provided with a limiting rod corresponding to the eccentric hole.

In some embodiments, the number of the eccentric holes is two, the two eccentric holes are arranged symmetrically with respect to the axis and are located on the same diameter, and the cross section of the eccentric hole is circular. The cross-section of the eccentric hole can be any shape such as circular, elliptical, or triangular, or even follow the shape. The cross-section of the limiting rod matches the cross-section of the eccentric hole. A circular cross-section reduces relative friction.

In some embodiments, the first slider 1 is close to the sheath relative to the second slider 2, and the first set of bending control wires includes a first bending control wire and a third bending control wire,

The first slider 1 is provided with a first connection hole and a first through hole, the second slider is provided with a second connection hole, and the first bending control wire is fixedly connected to the first connection hole. , the third bending control wire passes through the first through hole and is fixedly connected to the second connection hole.

In some embodiments, the left bundle branch introducing sheath further includes a tearer. The tearing device can also be a knife such as a scalpel.

In some embodiments, as shown in Figure 9, the locking control assembly includes a bending control knob 7, a bending control piece 13, a locking screw 15, a locking piece 14, a limiting ring 16, a locking knob 17 and a second shell. body.

The bending control knob 7 is provided with a protrusion in the circumferential direction, and the bending control member 13 is provided with a groove that matches the protrusion in the circumferential direction, and the protrusion and the groove are connected through a fit (which can be an interference fit or an interference fit). Glue), the bending control knob 7 and the bending control part 13 are fixedly connected, and the bending control part 13 can rotate as the bending control knob 7 rotates.

The bending control part 13 is provided with two centrally symmetrical connection holes for fixed connection with the second control bending wire and the fourth control bending wire in a one-to-one correspondence; the bending control part 13 is provided with a center hole, and one end of the center hole is provided with It is a first counterbore 12 with a tapering diameter (from the outer surface to the center position), and the other end is a second counterbore (built-in locking member 14) with a tapering diameter (from the outer surface to the center position);

As shown in Figure 10, the locking member 14 includes an integrally formed truncated cone structure 18, a cylindrical structure 19 and a hexagonal prism structure 20. The cylindrical structure 19 and the hexagonal prism structure 20 are provided with threaded counterbores, and the truncated cone structure 18 is provided with a cylindrical countersunk hole. , the diameter of the cylindrical counterbore is smaller than the diameter of the threaded counterbore, forming a limiting step; 1) the truncated cone structure 18 is used to clamp the first counterbore 12 of the bending control part 13, and the truncated cone structure 18 is arranged symmetrically along the circumferential center There are multiple openings (for example, 2-6) to reduce stress; 2) The cylindrical structure 19 is slidably sleeved in the second counterbore of the bending control part 13; 3) The hexagonal prism structure 20 is matched and sleeved in the second shell The hexagonal holes 21 on the body cooperate to prevent the locking member 14 from rotating around the axis;

After the screw section of the locking screw 15 is inserted into the central hexagonal hole of the limit ring, it is matched with the threaded counterbore of the locking member 14, and the displacement on the axis is limited by the positioning step; the locking screw 15 The nut is fixedly connected to the center hole of the locking knob 17 (such as snapping or bonding);

The center of the limit ring is provided with a hexagonal hole that is adapted to the hexagonal prism structure 20. One end surface is provided with a bump that is adapted to the arc-shaped hole 22 provided on the second housing. A circumferential boss that matches the circumferential flange of the tightening knob 17;

The locking knob 17 is provided with a central hole that can be adapted to the nut of the locking screw 15, and a circumferential flange that can be adapted to the circumferential boss of the limiting ring 16;

As shown in Figure 11, the center of one end surface of the second housing is provided with a circular hole that can match the wall of the first counterbore 12 of the bending control member 13, and the center of the other end surface is provided with a circular hole that matches the hexagonal prism structure 20. The matching hexagonal holes 21 are used to limit the matching arc-shaped holes 22 of the protrusions.

In some embodiments, the left bundle branch introducing sheath also includes a first side branch 10 and a second side branch 11. The first side branch 10 is a water pipeline for injecting liquids such as physiological saline or contrast media; the second side branch 10 is a water pipeline. The side branch 11 is an electric wire, connecting the head end electronics.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range. The above are only preferred embodiments of the present invention. It should be noted that those of ordinary skill in the art can also make several improvements and modifications without departing from the technical principles of the present invention. These improvements and modifications It should also be regarded as the protection scope of the present invention.

Claims (10)

1. A left bundle branch guide sheath is characterized in that the left bundle branch guide sheath comprises a tearable sheath tube and a bending control member for controlling the bending of the tearable sheath tube,

the tearable sheath tube comprises a tube body and a bending control ring embedded in the tube body; four through cavities which are axially communicated are formed in the wall of the pipe body along the circumferential direction, wherein two through cavities which are arranged at intervals are a first group of through cavities, and the other two through cavities which are arranged at intervals are a second group of through cavities;

the bending control component comprises a first group of bending control wires and a second group of bending control wires, wherein the first group of bending control wires comprise two bending control wires which are correspondingly penetrated in the first group of through cavities one by one, and the second group of bending control wires comprise other two bending control wires which are correspondingly penetrated in the second group of through cavities one by one; one end of each of the four bending control wires is connected with the bending control ring;

the bending control system further comprises a first component capable of controlling the first group of bending control wires and a second component capable of controlling the second group of bending control wires; the first component and the second component can bend the pipe body towards the direction where the bending control wire is located by pulling the corresponding bending control wire.

2. The left bundle branch guide sheath according to claim 1, wherein the first and second components are one of a thread control component or a locking control component.

3. The left bundle branch guide sheath according to claim 2, wherein the thread control assembly comprises a moving member fixedly connected with the bending control wire and a rotating member for controlling the movement of the moving member,

the locking control assembly comprises a bending control piece fixedly connected with the bending control wire, a bending control knob for controlling the bending control piece to rotate and a locking sub-assembly for limiting the bending control piece.

4. The left bundle branch guide sheath according to claim 1, wherein the tube body comprises a head end section, a bending control section and a main body section which are sequentially arranged,

the hardness of the head end section, the bending control section and the main body section is increased in turn,

the head end section is a distal end, the main body section is a proximal end, the proximal end of the main body section is provided with a notch which is convenient to tear, the bending control ring is embedded into the distal end inner wall of the bending control section, the electrode pair is arranged on the distal end outer wall of the bending control section and the proximal end of the bending control ring,

the thickness of the head end section is smaller than that of the bending control section, and the thickness of the bending control section is smaller than or equal to that of the main body section.

5. The left bundle branch guide sheath according to claim 1, wherein the outer wall of the tube body is further provided with an electrode pair for indicating the position of the tube body or/and the four through cavities are uniformly arranged.

6. The left bundle branch guide sheath according to claim 3, wherein the rotating member is provided with a hollow cavity, two ends of the hollow cavity are respectively provided with a first internal thread and a second internal thread, the first internal thread and the second internal thread have the same pitch and opposite rotation directions,

the moving part comprises a first sliding block and a second sliding block which can slide along the axle center, wherein the first sliding block is provided with a first external thread matched with the first internal thread, the second sliding block is provided with a second external thread matched with the second internal thread, and/or

The rotating member comprises a first cylinder matched with the first sliding block, a second cylinder matched with the second sliding block and a fixing member used for connecting the first cylinder and the second cylinder,

the inner diameter of the first cylinder is matched with the outer diameter of the first sliding block, and the inner diameter of the second cylinder is matched with the outer diameter of the second sliding block.

7. The left bundle branch guide sheath according to claim 6, wherein the first slide block is provided with an eccentric hole, the second slide block is provided with a limit rod corresponding to the eccentric hole, and/or

The number of the eccentric holes is two, the two eccentric holes are symmetrically arranged relative to the axis and positioned on the same diameter, and the cross section of each eccentric hole is circular.

8. The left bundle branch guide sheath according to claim 6, wherein the first slider is close to the tearable sheath with respect to the second slider,

the first slider is provided with a first connecting hole and a first through hole, the second slider is provided with a second connecting hole, the first connecting hole is fixedly connected with a bending control wire, and another bending control wire penetrating through the same group of through cavities penetrates through the first through hole and the second connecting hole.

9. The left bundle branch guide sheath according to claim 6, wherein the fixing member is a hand wheel sleeved outside the first cylinder and the second cylinder, the inner wall of the hand wheel is connected with the outer wall of the first cylinder and the outer wall of the second cylinder through buckles, the outer wall of the first cylinder and the outer wall of the second cylinder are respectively provided with a limiting member for limiting, the inner wall of the hand wheel is provided with two clamping grooves matched with the limiting members, and/or

The hand wheel is of a spindle type structure formed by connecting two first shells through a buckle, an anti-slip structure is arranged on the outer surface of the hand wheel, and two clamping grooves are respectively formed in the inner walls of the two first shells.

10. The left bundle branch guide sheath according to claim 1, further comprising a tear-away device.