Active bendable guide sheath tube

Abstract

The utility model discloses an active bendable guiding sheathing canal which comprises a sheathing canal body with the far end capable of deforming. A handle is arranged at the near end of the sheathing canal, four sets of pull wires are connected to the far end of the sheathing canal, the handle is provided with a bending control mechanism, and the bending control mechanism is connected with the sheathing canal in a universal rotating mode. One ends of the four sets of pull wires are connected with the four ends of the bending control mechanism respectively, and the other ends of the four sets of pull wires are connected with the far end of the sheathing canal to form a structure capable of pulling the far end of the sheathing canal to bend in at least four directions. The stone removing device has the advantages of being low in operation difficulty and capable of reducing damage and improving stone removing efficiency.

Description

Technical Field

[0001] This utility model relates to the field of medical sheath technology, and in particular to an active flexible guiding sheath. Background Technology

[0002] In the clinical treatment of urinary tract stones, the ureteral guiding sheath is an essential instrument. During surgical procedures, the ureteral guiding sheath dilates the ureter before inserting the endoscope and other instruments, creating a channel for continuous manipulation. It also protects the ureter during instrument exchanges, reducing the possibility of trauma. Furthermore, the sheath not only serves as an instrument channel but also as a pathway for the removal of fragmented stones. After lithotripsy, the fragments can be aspirated through the negative pressure interface of the guiding sheath, while simultaneously protecting delicate instruments and flexible endoscopes from damage, reducing costly repairs.

[0003] Due to the complex structure of the urinary tract, to minimize damage to the urinary tract during the insertion of the guiding sheath, clinical practice typically employs a flexible ureteroscope combined with a flexible guiding sheath and related lithotripsy equipment for stone removal. However, current flexible guiding sheaths often use distally passively bendable sheaths, whose bending direction and degree are not adjustable by the surgeon, making it difficult to access the lesion area, requiring a high level of skill from the surgeon, and easily leading to unsatisfactory suction results.

[0004] To address the aforementioned issues, existing technologies typically incorporate a bending control mechanism into the guide sheath. For instance, Chinese utility model patent application number CN202323310844.X discloses a ureteral guide sheath capable of large-angle bending. This guide sheath features a control handle on its sheath body, connected to the distal end of the sheath body via a pull line. This allows urologists to actively change the bending direction of the distal end of the sheath body by pulling the pull line, facilitating the distal end of the sheath's approach to the lesion area and effectively preventing damage to the urinary tract during insertion. However, the aforementioned ureteral guiding sheath only has two bending directions: the rotation of the turntable can only pull the distal end of the sheath upwards or downwards via two pull lines, thus limiting the bending direction. For stones located in special positions in the renal pelvis or calyces, there are situations where the sheath cannot reach these special positions, making it difficult to attract or remove the fragments. In particular, for special cases of calyx stenosis, the distal end of the sheath cannot pass through the calyx and remove the stones within it due to the limited bending direction. Although the bending direction of the distal end of the sheath can be further fine-tuned by rotating the entire ureteral guiding sheath, rotating the entire ureteral guiding sheath can easily damage the urinary tract and requires a high level of skill from the operator.

[0005] How to solve the above problems has become an urgent technical issue. Utility Model Content

[0006] The utility model discloses a purpose in to provide a kind of active bendable guide sheath, which has low operation difficulty, can reduce injury and improve the efficiency of stone removal.

[0007] To achieve the above object, the utility model adopts the following technical scheme:

[0008] The utility model provides a kind of active bendable guide sheath, including the sheath tube that the far end can be deformed;The proximal end of the sheath tube is provided with handle and the far end of the sheath tube is connected with four groups of pull lines, wherein, the handle is provided with bending control mechanism, the bending control mechanism is connected with the sheath tube universal rotation, one end of four groups of the pull line is connected with the four ends of bending control mechanism respectively and the other end of four groups of pull line is connected with the far end of the sheath tube and forms the structure that the far end of the sheath tube can be pulled to bend towards at least four directions.

[0009] Further, the bending control mechanism includes a rotating frame and a push rod. The rotating frame is rotationally connected with the handle and located above and below the sheath tube. An operating hole is formed in the rotating frame. One end of the push rod is rotationally connected with the sheath tube and the other end of the push rod passes through the operating hole and extends out of the rotating frame. The proximal ends of two groups of the pull lines are connected with the upper and lower ends of the rotating frame, respectively. The proximal ends of the other two groups of the pull lines are connected with the left and right sides of the push rod, respectively.

[0010] Further, the push rod includes a rod body. The lower end of the rod body is connected with the sheath tube through a universal joint. The upper end of the rod body passes through the operating hole and is connected with a sliding block. The left and right sides of the rod body are provided with pull line fixing positions. The two groups of pull lines located on the left and right sides of the push rod are connected with the two pull line fixing positions, respectively.

[0011] Further, the universal joint includes a universal spherical recess and a universal ball head. One end of the universal spherical recess is fixedly connected with the rod body. The other end of the universal spherical recess is rotationally connected with the universal ball head. The end of the universal ball head away from the universal spherical recess is fixedly connected with the sheath tube through a ball rod.

[0012] Further, the rotating frame includes at least one rotating disc. The rotating disc is provided with an annular groove. The rotating disc is coaxially connected with the groove and rotationally connected with the handle through the groove. The upper and lower ends of the rotating disc are connected with pull line assembly positions. The two pull line assembly positions are located above and below the sheath tube, respectively. The two pull line assembly positions are connected with the pull lines located on the upper and lower sides of the sheath tube, respectively. The operating hole is formed in one of the pull line assembly positions. The rotating disc is provided with a through hole. The pull line fixing position is gap-fitted with the through hole.

[0013] Further, the sheath tube includes a working cavity formed along the length direction thereof. Four pull line cavities are uniformly distributed around the working cavity. The distal ends of the pull lines are connected with the distal end of the sheath tube through the pull line cavities.

[0014] Further, the sheath further comprises a main pipe section, one end of the main pipe section is connected with a soft section capable of being deformed, and the other end of the main pipe section is connected with a negative pressure interface pipe, wherein the main pipe section is in communication connection with the soft section, the negative pressure interface pipe is in communication connection with the working cavity and is fixedly connected with the push rod, the handle is sleeved outside one end of the main pipe section connected with the negative pressure interface pipe, and the distal end of the pull wire is fixedly connected with the distal end of the soft section.

[0015] Further, the negative pressure interface pipe comprises a negative pressure main channel and a negative pressure secondary channel, wherein the negative pressure main channel, the main pipe section and the soft section are sequentially in communication connection to form the working cavity, one end of the negative pressure secondary channel is in communication connection with the negative pressure main channel, the other end of the negative pressure secondary channel is provided with a negative pressure interface for connecting an external negative pressure pipeline, and a negative pressure control hole is formed in the negative pressure secondary channel.

[0016] Further, the handle comprises a shell, sheath holes and fixing holes are respectively formed in both ends of the shell, one end of the main pipe section and the negative pressure interface pipe adjacent to each other is respectively inserted into the shell through the sheath hole and the fixing hole for plug-in connection, an operation window is formed in the shell for the push rod to pass through, a convex ring is arranged in the shell, and the convex ring is rotatably sleeved with the concave groove.

[0017] Further, limit pieces are arranged on both sides of the sheath, one end of the limit piece is fixedly connected with the sheath, the other end of the limit piece is provided with a limit hole, and two groups of pull wires arranged on the left and right sides of the sheath are in sliding connection with the limit hole.

[0018] Due to the above structure, the present application has the following beneficial effects:

[0019] The handle is arranged on the sheath, the control bending mechanism is arranged on the handle, four ends of the control bending mechanism are connected with the distal end of the sheath through four groups of pull wires, the distal end of the sheath can be bent in at least four directions, the distal end of the sheath has multiple bending directions, the distal end of the sheath can be bent in at least four directions without rotating the sheath as a whole, the distal end of the sheath can more conveniently reach special positions and narrow areas in the renal pelvis or calices, the operation difficulty is effectively reduced, the harm to the urinary tract is reduced, and the stone removal efficiency is improved.

[0020] The present application will become more apparent from the following description and accompanying drawings, which are used to explain the embodiments of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without any creative labor.

[0022] Figure 1 It is a whole structure schematic view of the present application;

[0023] Figure 2 It is a structure schematic view of the bending control mechanism of the present application;

[0024] Figure 3 It is a whole cross-sectional view of the present application;

[0025] Figure 4 It is a cross-sectional view of the handle of the present application;

[0026] Figure 5 It is a cross-sectional view of the bending control mechanism of the present application;

[0027] Figure 6 It is a cross-sectional view of the sheath of the present application. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without any creative labor are within the protection scope of the present application.

[0029] Please refer to Figures 1 to 6The utility model discloses an active bendable guide sheath, which comprises a sheath 1 capable of deforming at a distal end, a handle 2 is arranged at a proximal end of the sheath 1, and four groups of pull wires 3 are connected to the distal end of the sheath 1.

[0030] Preferably, the number of pull wires 3 in each group is one, and the four groups of pull wires 3 correspond to the four directions of up, down, left and right respectively.

[0031] In the utility model embodiment, the bending control mechanism comprises a rotating frame 4 and a push rod 5, the rotating frame 4 is rotationally connected to the handle 2, the upper and lower ends of the rotating frame 4 are located above and below the sheath 1 respectively, operation holes 6 are formed in the rotating frame 4, one end of the push rod 5 is rotationally connected to the sheath 1, the other end of the push rod 5 passes out of the rotating frame 4 through the operation holes 6, and the proximal ends of two groups of pull wires 3 are connected to the upper and lower ends of the rotating frame 4 respectively, and the proximal ends of the other two groups of pull wires 3 are connected to the left and right sides of the push rod 5 respectively. In actual use, the push rod 5 is pushed to deflect forward and backward, the outer wall of the push rod 5 abuts against the front or rear inner wall of the operation holes 6, the rotating frame 4 can be axially rotated forward or backward, and the distal end of the sheath 1 can be bent up and down through the pull wires 3; the push rod 5 is pushed to deflect left and right, the push rod 5 and the operation holes 6 are in sliding fit, and the distal end of the sheath 1 can be bent left and right through the pull wires 3; therefore, the distal end of the sheath 1 can be bent in at least four directions of up, down, left and right by only controlling the push rod 5 to deflect forward, backward, left and right with one hand.

[0032] Preferably, the operation hole site 6 is a strip-shaped hole, the length direction of the operation hole site 6 is perpendicular to the axis of the sheath tube 1, the length of the operation hole site 6 is greater than the cross-sectional length of the push rod 5, and the width of the operation hole site 6 is greater than or equal to the cross-sectional width of the push rod 5, so that the rotating frame 4 can be axially rotated when the push rod 5 is deflected forward and backward, and the rotating frame 4 will not be radially rotated when the push rod 5 is deflected left and right.

[0033] In the embodiment of the utility model, the push rod 5 includes a rod body 51, the lower end of the rod body 51 is connected with the sheath tube 1 through a universal joint 52, and the upper end of the rod body 51 is connected with a sliding block 53 outside the rotating frame 4 through the operation hole site 6, so that the sliding block 53 can drive the rod body 51 to rotate universally.

[0034] Preferably, the rod body 51 is matched with the front and rear inner walls of the operation hole site 6 with zero gap or small gap, so as to ensure that the rotating disc 41 can be circumferentially displaced through the rod body 51 when the sliding block 53 is moved forward and backward, and the rod body 51 is matched with the left and right inner walls of the operation hole site 6 with large gap, so as to ensure that the sliding block 53 can slide left and right along the operation hole site 6 without obstacles within a certain range, and the rod body 51 will not drive the rotating disc 41 to rotate or displace.

[0035] In the embodiment of the utility model, the universal joint 52 includes a universal spherical recess 521 and a universal ball head 522, one end of the universal spherical recess 521 is fixedly connected with the rod body 51, the other end of the universal spherical recess 521 is connected with the universal ball head 522 in universal rotation, and the end of the universal ball head 522 away from the universal spherical recess 521 is fixedly connected with the sheath tube 1 through a ball rod 523, so that the push rod 5 is connected with the sheath tube 1 in universal rotation.

[0036] Preferably, the universal spherical recess 521 on the rod body 51 is matched with the universal ball head 522 on the negative pressure interface pipe in zero gap or interference fit, so that the universal spherical recess 521 and the universal ball head 522 can rotate universally while generating a certain frictional resistance, preventing the rod body 51 and the rotating disc 41 from rotating non-planedly; the universal spherical recess 521 and the rod body 51 are integrally formed or welded or adhesively fixed, and the universal ball head 522 and the ball rod 523 and the sheath tube 1 are integrally formed or welded or adhesively fixed.

[0037] In the embodiment of the utility model, the rod body 51 is provided with a pull wire fixing site 54 on each side, and the two groups of pull wires 3 located on the left and right sides of the push rod 5 are connected with the two pull wire fixing sites 54, so that when a doctor controls the push rod 5 to be offset, the two groups of pull wires 3 located on the left and right sides of the push rod 5 can be pulled, and the distal end of the sheath tube 1 is controlled to bend left and right.

[0038] Preferably, the two pull wire fixing positions 54 are symmetrically arranged on both sides of the rod body 51; the sliding block 53, the rod body 51 and the pull wire fixing position 54 are integrally formed or welded or adhesively fixed, and the pull wire fixing position 54 is welded or adhesively or bindingly fixed with the pull wire 3; it can be understood that, in some optional embodiments, the two pull wire fixing positions 54 can also be fixedly arranged on both sides of the universal spherical recess 521.

[0039] In the embodiment of the utility model, the rotating frame 4 includes at least one rotating disc 41, the rotating disc 41 is provided with annular groove 42, the rotating disc 41 is coaxial with groove 42 and the rotating disc 41 is rotatably connected with handle 2 through groove 42, so that rotating frame 4 is installed on handle 2, and the degree of freedom of rotating frame 4 can be limited, so that rotating frame 4 can only rotate axially, and the upper and lower ends of rotating disc 41 are connected with pull wire assembly position 43, two pull wire assembly positions 43 are located above and below sheath tube 1 respectively, and two pull wire assembly positions 43 are connected with pull wire 3 located on the upper and lower sides of sheath tube 1 respectively, operating hole position 6 is arranged on one of pull wire assembly positions 43, and through hole 44 is arranged on rotating disc 41, and pull wire fixing position 54 is gap matched with through hole 44, so that pull wire fixing position 54 has sufficient movement space when push rod 5 is deflected.

[0040] Preferably, the distance between two pull wire assembly positions 43 and the axis of sheath tube 1 is equal; the rotating disc 41 and pull wire assembly position 43 are integrally formed or welded or adhesively fixed; pull wire assembly position 43 is welded or adhesively or bindingly fixed with pull wire 3.

[0041] In the embodiment of the utility model, the number of rotating disc 41 is one and is located on one side of sheath tube 1, and correspondingly, one end of pull wire assembly position 43 is connected with rotating disc 41, and one of pull wire fixing position 54 is gap matched with through hole 44.

[0042] In some optional embodiments, the number of rotating disc 41 can be two and symmetrically located on both sides of sheath tube 1, and correspondingly, two ends of pull wire assembly position 43 are respectively connected with rotating disc 41 on both sides, and two pull wire fixing positions 54 are respectively gap matched with through hole 44 on the same side.

[0043] In the embodiment of the utility model, the sheath tube 1 includes working cavity 14 which is arranged along the length direction, four pull wire cavities 15 are uniformly distributed around the working cavity 14, and the distal end of each pull wire 3 is connected with the distal end of sheath tube 1 through each pull wire cavity 15.

[0044] Preferably, the working cavity 14 is coaxial with sheath tube 1 and penetrates sheath tube 1; the distal end of pull wire cavity 15 is a closed end and the inner diameter is greater than the outer diameter of pull wire 3, and the proximal end of pull wire cavity 15 penetrates the outer wall of sheath tube 1 to form an open end, and the open end is located in handle 2.

[0045] The sheath tube 1 further comprises a main pipe section 11, one end of the main pipe section 11 is connected with a soft section 12 capable of being deformed, and the other end of the main pipe section 11 is connected with a negative pressure interface pipe 13, wherein the main pipe section 11 is in communication connection with the soft section 12, the negative pressure interface pipe 13 is in communication with the working cavity 14, and the negative pressure interface pipe 13 is fixedly connected with the push rod 5, the handle 2 is sleeved outside one end of the main pipe section 11 and the negative pressure interface pipe 13, and the distal end of the pull wire 3 is fixedly connected with the distal end of the soft section 12, so that when the control bending mechanism pulls the pull wire 3 to slide along the pull wire cavity 15, the distal end of the soft section 12 can be bent, and the bending angle of the soft section 12 corresponding to each pull wire direction can reach 0-180°, and the opposite two-way bending angle can reach -180°-180°.

[0046] Preferably, the distal end of the pull wire cavity 15 extends to the distal end of the soft section 12, the proximal end of the pull wire cavity 15 extends to the proximal end of the main pipe section 11 and breaks the outer wall of the main pipe section 11 to extend out of the main pipe section 11; the main pipe section 11 is a hard straight pipe, the soft section 112 is made of TPU material or Pebax material or a combination of the two materials, and the main pipe section 11 and the soft section 12 are fixed by welding or adhesion.

[0047] In the embodiment of the utility model, the negative pressure interface pipe 13 comprises negative pressure main passage 131, negative pressure secondary passage 132, wherein, negative pressure main passage 131, main pipe section 11, soft section 12 are sequentially connected and form working cavity 14, one end of negative pressure secondary passage 132 is connected with negative pressure main passage 131 and the other end of negative pressure secondary passage 132 is provided with negative pressure interface 133 for connecting external negative pressure pipeline, and negative pressure control hole 134 is set up on negative pressure secondary passage 132, the area of negative pressure control hole 134 is changed by the way of finger pressing plugging or shielding, and the size of negative pressure suction force can be adjusted.

[0048] Preferably, the negative pressure main passage 131 and the negative pressure secondary passage 132 are integrally formed or welded or adhesively connected to form a tee pipe structure; the negative pressure main passage 131 is in plug-in communication with the main pipe section 11 and the two are fixed by interference fit.

[0049] In the embodiment of the utility model, the handle 2 comprises a shell 21, sheath tube holes 22 and fixing holes 23 are respectively formed in both ends of the shell 21, one end of the main pipe section 11 and the negative pressure interface pipe 13 adjacent to each other is respectively inserted into the shell 21 through the sheath tube hole 22 and the fixing hole 23 and is in plug-in connection, and an operation window 24 for the push rod 5 to pass through is formed in the shell 21, which facilitates the doctor's finger to control the push rod 5 to deflect forward and backward.

[0050] Preferably, the sliding block 53 is located above the operation window 24; the length direction of the operation window 203 is perpendicular to the axis of the sheath tube 1, the length of the operation window 203 is greater than the length of the operation hole 6, and the width of the operation window 203 is greater than or equal to the width of the operation hole 6, so that the push rod 5 has enough space to deflect forward, backward, left and right.

[0051] In the embodiment of the utility model, the shell 21 is internally provided with a convex ring 25, and the convex ring 25 is rotationally sleeved with the groove 42.

[0052] Preferably, the shell 21 and the convex ring 25 are welded or adhesively fixed, and the axis of the convex ring 25 is perpendicular to the axis of the sheath tube 1, so that the rotating frame 4 can be installed in the handle 2, and the degree of freedom of the rotating frame 4 can be limited, so that the rotating frame 4 can only axially rotate and the axis thereof is perpendicular to the axis of the sheath tube 1.

[0053] In the embodiment of the utility model, the sheath tube 1 is provided with a limiting piece 7 on both sides, one end of the limiting piece 7 is fixedly connected with the sheath tube 1, the other end of the limiting piece 7 is provided with a limiting hole 8, two groups of pull wires 3 on the left and right sides of the sheath tube 1 are slidably matched with the limiting hole 8, and the proximal end of the pull wire 3 is connected with the pull wire fixing position 54 through the limiting hole 8.

[0054] Preferably, the height of the limiting hole 8 is consistent with the height of the proximal end of the pull wire cavity 15, and the distance between the two limiting holes 8 and the axis of the sheath tube 1 is equal, so that the bending control effect is better.

[0055] In use, the doctor holds the handle 2 and presses the sliding block 53 with the thumb, pushes the push rod 5 to deflect forward and backward, until the outer wall of the rod body 51 abuts against the front inner wall or the rear inner wall of the operation hole 6, the rotating frame 4 can be axially rotated forward or backward, and then the distal end of the soft section 12 is pulled to bend upward or downward through the two groups of pull wires 3 connected with the pull wire assembly position 43, or the push rod 5 is pushed to deflect left and right, the rod body 51 deflects left and right in the operation hole 6, the distal end of the soft section 12 is pulled to bend left and right through the two groups of pull wires 3 connected with the pull wire fixing position 54, so that the distal end of the sheath tube 1 is bent upward, downward, leftward and rightward by controlling the forward, backward, leftward and rightward deflection of the push rod 5, the distal end of the sheath tube 1 can reach a special position and a narrow area in the renal pelvis or calyx, the operation difficulty is effectively reduced, and the damage to the urinary tract is reduced and the stone clearing efficiency is improved.

[0056] The preferred embodiments of the present application are described above. It should be understood that the present application is not limited to the specific embodiments described above, wherein the devices and structures not described in detail should be understood as being implemented in the ordinary way in the art; any person skilled in the art, without departing from the scope of the technical scheme of the present application, can make many possible changes and modifications to the technical scheme of the present application by using the disclosed methods and technical contents, or modify equivalent embodiments, which does not affect the essential content of the present application. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, without departing from the content of the technical scheme of the present application, still belongs to the scope of protection of the technical scheme of the present application.

Claims

1. An actively bendable introducer sheath comprising a distal end deformable sheath (1); characterized in that: The proximal end of the sheath (1) is provided with a handle (2) and the distal end of the sheath (1) is connected with four groups of pull wires (3), wherein the handle (2) is provided with a bending control mechanism, the bending control mechanism is connected with the sheath (1) in a universal manner, one end of the four groups of pull wires (3) is connected with four ends of the bending control mechanism respectively and the other end of the four groups of pull wires (3) is connected with the distal end of the sheath (1) to form a structure capable of pulling the distal end of the sheath (1) to bend in at least four directions; The bending control mechanism comprises a rotating frame (4) and a push rod (5), the rotating frame (4) is connected with the handle (2) in a rotating manner, the upper and lower ends of the rotating frame (4) are located above and below the sheath (1) respectively, an operation hole (6) is formed in the rotating frame (4), one end of the push rod (5) is connected with the sheath (1) in a universal manner and the other end of the push rod (5) passes out of the rotating frame (4) through the operation hole (6), and the proximal ends of two groups of the pull wires (3) are connected with the upper and lower ends of the rotating frame (4) respectively, and the proximal ends of the remaining two groups of the pull wires (3) are connected with the left and right sides of the push rod (5) respectively. The push rod (5) comprises a rod body (51), the lower end of the rod body (51) is connected with the sheath (1) through a universal joint (52) and the upper end of the rod body (51) passes out of the rotating frame (4) through the operation hole (6) and is connected with a sliding block (53), and the two sides of the rod body (51) are provided with pull wire fixing positions (54), and the two groups of pull wires (3) located on the left and right sides of the push rod (5) are connected with the two pull wire fixing positions (54) respectively. The universal joint (52) comprises a universal spherical recess (521) and a universal ball head (522), one end of the universal spherical recess (521) is fixedly connected with the rod body (51) and the other end of the universal spherical recess (521) is connected with the universal ball head (522) in a universal manner, and the end of the universal ball head (522) away from the universal spherical recess (521) is fixedly connected with the sheath (1) through a ball rod (523). The rotating frame (4) comprises at least one rotating disc (41), the rotating disc (41) is provided with an annular recess (42), the rotating disc (41) is coaxial with the recess (42) and is connected with the handle (2) in a rotating manner through the recess (42), the upper and lower ends of the rotating disc (41) are connected with pull wire assembly positions (43), the two pull wire assembly positions (43) are located above and below the sheath (1) respectively and are connected with the pull wires (3) located on the upper and lower sides of the sheath (1) respectively, the operation hole (6) is formed in one of the pull wire assembly positions (43), and the rotating disc (41) is provided with a through hole (44), and the pull wire fixing position (54) is matched with the through hole (44) in a clearance fit.

2. An actively bendable introducer sheath according to claim 1, wherein: The sheath (1) comprises a working cavity (14) formed along the length direction thereof, four pull wire cavities (15) are uniformly distributed around the working cavity (14) at equal intervals, and the distal end of each pull wire (3) is connected with the distal end of the sheath (1) through each pull wire cavity (15).

3. An actively bendable introducer sheath according to claim 2, wherein: The sheath (1) further comprises a main pipe section (11), one end of the main pipe section (11) is connected with a soft section (12) capable of being deformed, and the other end of the main pipe section (11) is connected with a negative pressure interface pipe (13), wherein the main pipe section (11) is in communication connection with the soft section (12), the negative pressure interface pipe (13) is in communication connection with the working cavity (14) and is fixedly connected with the push rod (5), the handle (2) is sleeved outside one end of the main pipe section (11) and the negative pressure interface pipe (13), and the distal end of the pull wire (3) is fixedly connected with the distal end of the soft section (12).

4. An actively bendable introducer sheath according to claim 3, wherein: The negative pressure interface pipe (13) comprises a negative pressure main channel (131) and a negative pressure secondary channel (132), wherein the negative pressure main channel (131), the main pipe section (11) and the soft section (12) are sequentially connected in communication to form the working cavity (14), one end of the negative pressure secondary channel (132) is in communication connection with the negative pressure main channel (131), the other end of the negative pressure secondary channel (132) is provided with a negative pressure interface (133) for connecting an external negative pressure pipeline, and a negative pressure control hole (134) is formed in the negative pressure secondary channel (132).

5. An actively bendable introducer sheath according to claim 3 or 4, wherein: The handle (2) comprises a shell (21), two ends of the shell (21) are respectively provided with a sheath hole (22) and a fixing hole (23), one end of the main pipe section (11) and the negative pressure interface pipe (13) adjacent to each other respectively extend into the shell (21) through the sheath hole (22) and the fixing hole (23) for plug-in connection, an operation window (24) is formed in the shell (21) for the push rod (5) to pass through, a convex ring (25) is arranged in the shell (21), and the convex ring (25) is rotatably sleeved with the recess (42).

6. An actively bendable introducer sheath according to claim 1, wherein: Two limiters (7) are arranged on both sides of the sheath (1), one end of the limiter (7) is fixedly connected with the sheath (1), the other end of the limiter (7) is provided with a limiting hole (8), and two groups of pull wires (3) arranged on the left and right sides of the sheath (1) are in sliding connection with the limiting hole (8).

Images