Conveying device

Abstract

The invention relates to the technical field of medical instruments, and discloses a conveying device which comprises a handle and a sheathing canal which are connected, a bending adjusting assembly is arranged in a shell, one end of a bending adjusting wire is wound around a first traction wheel, and the other end of the bending adjusting wire is connected with the sheathing canal; the driving assembly is arranged outside the shell, and when a rotary knob of the driving assembly rotates, the driving assembly drives the first traction wheel to rotate; a ratchet wheel of the locking assembly is connected to the shell, a connecting groove is formed in the side, facing the ratchet wheel, of a rotary knob, the axis of the connecting groove is not collinear with the rotating axis of the rotary knob, a locking part stretches into the connecting groove, and an elastic piece is arranged between the locking part and the groove bottom of the connecting groove. A plurality of ratchet teeth are annularly arranged on the side wall of the ratchet, a ratchet groove is formed among the ratchet teeth, the end, away from the elastic piece, of the locking component is a locking end, the elastic piece can drive the locking component so that the locking end can be embedded in the ratchet groove, the side, close to one ratchet tooth, of the locking end is a guide face, and the side, close to the other ratchet tooth, of the locking end is a locking face.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a delivery device. Background Art

[0002] The mitral valve clip, also known as the mitral valve occluder, is a medical device specifically used for mitral valve clip surgery in cardiovascular medicine. During use, the clip is delivered to the heart through a delivery catheter via a human blood vessel. When the mitral valve clip is being delivered through the blood vessel, it is necessary to control the bending angle of the sheath tube so that the mitral valve clip can smoothly pass through the curved blood vessel. In the prior art, a knob is often used to adjust the bending angle of the sheath tube. When the knob is rotated to a preset position, the damping effect of an elastomer is utilized to achieve the locking effect of the knob. However, the elastomer has the following disadvantages: First, the locking components are mostly made of rubber or silicone products, and it is difficult to control their dimensions, resulting in a high defective rate; Second, in actual application, when the pulling force of the sheath tube is too large, it is prone to rebound; Third, the storage life of rubber products is relatively short, and they age severely.

[0003] Based on this, there is an urgent need for a delivery device to solve the above problems. Summary of the Invention

[0004] Based on the above, the object of the present invention is to provide a delivery device, which can greatly reduce the possibility of the sheath tube bending and rebounding, improve the bending adjustment accuracy of the sheath tube, and reduce the probability of material failure.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] Provide a delivery device, including a connected handle and a sheath tube. The sheath tube is provided with a bending adjustment wire. The handle includes:

[0007] A housing;

[0008] A bending adjustment assembly disposed in the housing. The bending adjustment assembly includes a first traction wheel. One end of the bending adjustment wire is wound around the first traction wheel, and the other end is connected to the sheath tube;

[0009] A driving assembly disposed outside the housing. The driving assembly includes a knob. When the knob rotates, the driving assembly drives the first traction wheel to rotate;

[0010] A locking assembly, which includes a ratchet wheel, a locking member, and an elastic member. The ratchet wheel is connected to the housing. A connecting groove is provided on the side of the knob facing the ratchet wheel. The axis of the connecting groove is not collinear with the rotation axis of the knob. The locking member extends into the connecting groove, and the elastic member is disposed between the locking member and the bottom of the connecting groove;

[0011] The side wall of the ratchet is provided with a plurality of ratchet teeth, and ratchet grooves are arranged between the plurality of ratchet teeth. One end of the locking member away from the elastic member is a locking end. The elastic member can drive the locking member so that the locking end is embedded in the ratchet groove. One side of the locking end close to one ratchet tooth is a guiding surface, and one side close to another ratchet tooth is a locking surface.

[0012] As a preferred technical solution of a conveying device, the handle further includes a bracket for connecting the sheath tube, and the bracket is provided with a second connection hole;

[0013] The driving assembly further includes a second transmission rod, a first gear, and a fixing pin. The knob is provided with a third connection hole located at the center of the knob. The second transmission rod passes through the central hole of the ratchet, and one end of the second transmission rod is stop-connected to the third connection hole, and the other end is stop-connected to one side of the first gear; One end of the fixing pin is rotatably connected to the other side of the first gear, and the other end is stop-connected to the second connection hole;

[0014] As a preferred technical solution of a conveying device, the bracket is provided with a first connection hole;

[0015] The bending adjustment assembly further includes a first transmission rod and a second gear. The first transmission rod is rotatably connected to the first connection hole. The first traction wheel is stop-connected to the first transmission rod. The second gear is stop-connected to the first transmission rod, and the second gear is meshed and connected to the first gear.

[0016] As a preferred technical solution of a conveying device, the locking member includes a lever and a lever shaft. The lever is stop-connected to the lever shaft, and the locking end is arranged at one end of the lever away from the lever shaft;

[0017] The elastic member is a spring. The spring is sleeved on the lever shaft, and one end abuts against the bottom of the connection groove, and the other end abuts against the lever.

[0018] As a preferred technical solution of a conveying device, a through hole is provided at the bottom of the connection groove. One end of the lever shaft away from the lever is provided with a rotating portion. The rotating portion extends out of the through hole, and the rotating portion is provided with a driving arm extending radially.

[0019] As a preferred technical solution of a conveying device, a through clamping groove is provided on one side of the knob away from the ratchet. One end of the driving arm away from the rotating portion is provided with a clamping portion, and the clamping portion can be clamped in the clamping groove.

[0020] As a preferred technical solution of a conveying device, the locking assembly further includes a flexible pad. A stepped surface is provided on the side wall of the lever shaft, and the flexible pad is arranged between the stepped surface and the bottom of the connecting groove.

[0021] As a preferred technical solution of a conveying device, the bending adjustment assembly further includes a second traction wheel. The second traction wheel is connected to the first transmission rod in a stopping manner. Two bending adjustment wires are provided on the sheath tube, and the two bending adjustment wires are respectively wound around the first traction wheel and the second traction wheel. The winding directions of the bending adjustment wires on the first traction wheel and the second traction wheel are opposite.

[0022] As a preferred technical solution of a conveying device, the guiding surface is an arc surface, and the locking surface is a flat surface.

[0023] As a preferred technical solution of a conveying device, a plurality of auxiliary ribs and at least one indicating rib are provided on the side wall of the knob.

[0024] The beneficial effects of the present invention are as follows:

[0025] The present invention provides a conveying device. When in use, by rotating the knob, the driving assembly drives the first traction wheel to rotate. The first traction wheel tightens or relaxes the bending adjustment wire to realize the bending adjustment of the sheath tube. Among them, during the rotation of the knob, the knob drives the locking component to move together. The locking end of the locking component interferes with the ratchet teeth. Under the interference of the ratchet teeth, the guiding surface of the locking end can drive the locking component to disengage from the ratchet groove and compress the elastic member. When the locking end crosses the ratchet teeth, the elastic member drives the locking end to be embedded in the next ratchet groove. Among them, only the side provided with the guiding surface can cross the ratchet teeth, while the locking surface can prevent the knob from rotating in the reverse direction, realizing the one-way rotation in the first direction and realizing the limit of the knob. Compared with the locking method of the elastic body in the prior art, the locking assembly of the present invention greatly reduces the possibility of rebound, improves the rotation accuracy of the knob; the service life of the locking assembly is much higher than that of a general elastic body, reducing the probability of material failure. Moreover, the tooth number ratio of the ratchet teeth can be adjusted, the number of ratchet teeth can be increased, and the adjustment accuracy can be improved to realize precise adjustment. Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the content of the embodiments of the present invention and these drawings.

[0027] Figure 1 It is a schematic structural diagram of the conveying device provided by the specific embodiment of the present invention;

[0028] Figure 2 is an exploded view of the structure of the conveying device provided by the specific embodiment of the present invention;

[0029] Figure 3 is a partial structural cross-sectional view of the conveying device provided by the specific embodiment of the present invention;

[0030] Figure 4 is a cross-sectional view of the knob of the conveying device provided by the specific embodiment of the present invention;

[0031] Figure 5 is a front view of the lever provided by the specific embodiment of the present invention;

[0032] Figure 6 is a structural cross-sectional view of the bending adjustment assembly provided by the specific embodiment of the present invention.

[0033] The markings in the figure are as follows:

[0034] 1. Housing;

[0035] 2. Bracket; 21. Second connection hole;

[0036] 3. Sheath;

[0037] 4. Bending adjustment assembly; 41. First traction wheel; 42. First transmission rod; 421. Second stop hole; 43. Second gear; 44. Second traction wheel;

[0038] 5. Driving assembly; 51. Knob; 511. Connection groove; 512. Through hole; 513. Clamping groove; 514. Auxiliary rib; 515. Indicator rib; 516. Third connection hole; 52. Second transmission rod; 53. First gear; 54. Fixed pin;

[0039] 6. Locking assembly; 61. Ratchet; 611. Ratchet teeth; 612. Ratchet groove; 62. Locking member; 621. Lever; 6211. Guide surface; 6212. Locking surface; 622. Lever shaft; 6221. Rotating part; 63. Driving arm; 631. Clamping part; 64. Elastic member; 65. Flexible pad. Specific Embodiment

[0040] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that for the convenience of description, only parts related to the present invention are shown in the drawings, rather than all structures.

[0041] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0042] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over", and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath", and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0043] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "left", and "right" are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0044] As Figures 1 - 3 shown, this embodiment provides a delivery device, which can be used to deliver interventional or implantable bodies such as valve repair and valve replacement to blood vessels or cavities. The delivery device includes a handle and an adjustable bending sheath 3. The proximal end of the adjustable bending sheath 3 is connected to the handle. The sheath 3 includes a bending wire. One end of the bending wire is connected to the distal end of the sheath 3, and the other end is connected to the handle. The handle includes a housing 1, a bending adjustment assembly 4, a driving assembly 5, and a locking assembly 6.

[0045] Specifically, the bending adjustment assembly 4 is arranged inside the housing 1. The bending adjustment assembly 4 includes a first traction wheel 41. One end of the bending wire is wound around the first traction wheel 41, and the other end is connected to the sheath tube 3. The driving assembly 5 is arranged outside the housing 1. The driving assembly 5 includes a knob 51. When the knob 51 rotates, the driving assembly 5 drives the first traction wheel 41 to rotate. The locking assembly 6 includes a ratchet wheel 61, a locking member 62 and an elastic member 64. The ratchet wheel 61 is connected to the housing 1. A connecting groove 511 is arranged on one side of the knob 51 facing the ratchet wheel 61. The axis of the connecting groove 511 is not collinear with the rotation axis of the knob 51. The locking member 62 extends into the connecting groove 511, and an elastic member 64 is arranged between the locking member 62 and the bottom of the connecting groove 511. A plurality of ratchet teeth 611 are annularly arranged on the side wall of the ratchet wheel 61, and a ratchet groove 612 is arranged between the plurality of ratchet teeth 611. One end of the locking member 62 away from the elastic member 64 is the locking end. The elastic member 64 can drive the locking member 62 so that the locking end is embedded in the ratchet groove 612. One side of the locking end close to a ratchet tooth 611 is a guiding surface 6211, and one side close to another ratchet tooth 611 is a locking surface 6212.

[0046] During use, by rotating the knob 51, the driving assembly 5 drives the first traction wheel 41 to rotate. The first traction wheel 41 tightens or relaxes the bending wire to realize the bending adjustment of the sheath tube 3. Among them, during the rotation of the knob 51, the knob 51 drives the locking member 62 to move together. The locking end of the locking member 62 interferes with the ratchet teeth 611. Under the interference of the ratchet teeth 611, the guiding surface 6211 of the locking end can drive the locking member 62 to disengage from the ratchet groove 612 and compress the elastic member 64. When the locking end passes over the ratchet tooth 611, the elastic member 64 drives the locking end to be embedded in the next ratchet groove 612. Among them, only the side provided with the guiding surface 6211 can pass over the ratchet tooth 611, while the locking surface 6212 can prevent the knob 51 from rotating in the reverse direction, realizing one-way rotation in the first direction and realizing the limit of the knob 51. Compared with the locking method of the elastic body in the prior art, the locking assembly 6 of the present invention can greatly reduce the possibility of the sheath tube 3 bending and rebounding. The service life of the locking assembly 6 is much higher than that of a general elastic body, reducing the probability of material failure. Moreover, the tooth number ratio of the ratchet teeth 611 can be adjusted, the number of ratchet teeth 611 can be increased, and the adjustment accuracy can be improved to realize precise adjustment.

[0047] In this embodiment, as Figure 5 shown, the guiding surface 6211 is an arc surface. When the knob 51 rotates, the arc surface can pass over the ratchet tooth 611. The locking surface 6212 is a plane so that the knob 51 cannot rotate in the reverse direction. In this embodiment, the connection method between the ratchet wheel 61 and the housing 1 can be processes such as screw connection, welding or riveting.

[0048] Furthermore, as Figure 2 and Figure 3As shown in the figure, the handle further includes a bracket 2 for connecting the sheath tube 3. The bracket 2 is provided with a second connection hole 21. The driving assembly 5 further includes a second transmission rod 52, a first gear 53, and a fixing pin 54. The knob 51 is provided with a third connection hole 516 located at the center of the knob 51, which is convenient for applying force to the knob 51 and improving the rotation accuracy of the knob 51. The second transmission rod 52 passes through the central hole of the ratchet wheel 61, reducing the occupied space of the locking assembly 6. One end of the second transmission rod 52 is stop-connected to the third connection hole 516, and the other end is stop-connected to one side of the first gear 53. The bracket 2 is provided with a second connection hole 21. One end of the fixing pin 54 is rotatably connected to the other side of the first gear 53, and the other end is stop-connected to the second connection hole 21. When the knob 51 rotates, the first gear 53 is driven to rotate by the second transmission rod 52.

[0049] Further, the bracket 2 is provided with a first connection hole. The bending adjustment assembly 4 further includes a first transmission rod 42 and a second gear 43. The first transmission rod 42 is rotatably connected to the first connection hole. The first traction wheel 41 is stop-connected to the first transmission rod 42. The second gear 43 is stop-connected to the first transmission rod 42, and the second gear 43 is meshed with the first gear 53. When the knob 51 rotates, the knob 51 drives the second transmission rod 52 to rotate, the second transmission rod 52 drives the first gear 53 to rotate, and the first gear 53 drives the second gear 43 to rotate, thereby driving the first transmission rod 42 to rotate.

[0050] In this embodiment, the fixing pin 54 can support the second transmission rod 52, the first gear 53, and the first gear 53. The two sides of the first gear 53 are respectively provided with a fourth connection hole and a fifth connection hole. The side walls at both ends of the second transmission rod 52 are provided with planes. The fourth connection hole and the third connection hole 516 respectively match the two ends of the second transmission rod 52. When the two ends of the second transmission rod 52 are respectively inserted into the fourth connection hole and the third connection hole 516, stop connection is achieved through the planes. The side wall of the first end of the fixing pin 54 is provided with a plane, and the second end is cylindrical. The shape of the second connection hole 21 matches the first end of the fixing pin 54. The first end of the fixing pin 54 is inserted into the second connection hole 21, and stop connection is achieved through the plane. The shape of the fifth connection hole matches the second end of the fixing pin 54. The second end of the fixing pin 54 is inserted into the fifth connection hole to achieve rotational connection.

[0051] In this embodiment, the locking component 62 includes a lever 621 and a lever shaft 622. The lever 621 is fixedly connected to the lever shaft 622, and the locking end is provided at one end of the lever 621 away from the lever shaft 622. The elastic member 64 is a spring. The spring is sleeved on the lever shaft 622, and one end abuts against the bottom of the connection groove 511, and the other end abuts against the lever 621, so that the spring can apply an elastic force to the lever 621. In this embodiment, a flat surface is provided on the side wall of one end of the lever shaft 622 close to the lever 621. The lever 621 is provided with a sixth connection hole. The shape of the sixth connection hole matches the shape of one end of the lever shaft 622 close to the lever 621. The lever shaft 622 is inserted into the sixth connection hole, and the fixed connection is achieved through the flat surface.

[0052] Preferably, as Figures 2 - 4 shown, a through hole 512 is provided at the bottom of the connection groove 511. A rotating portion 6221 is provided at one end of the lever shaft 622 away from the lever 621. The rotating portion 6221 extends out from the through hole 512, and a driving arm 63 extending in the radial direction is provided on the rotating portion 6221. An operator can operate the driving arm 63 to rotate around the rotating portion 6221, thereby driving the locking component 62 to rotate 180°, so that the knob 51 can perform one-way rotation in the second direction. The first direction is opposite to the second direction, realizing that the knob 51 can be adjusted bidirectionally, and further tightening or loosening the bending wire bidirectionally, so as to realize the bending of the sheath tube 3 in different directions.

[0053] Further preferably, a through engaging groove 513 is provided on one side of the knob 51 away from the ratchet 61. A engaging portion 631 is provided at one end of the driving arm 63 away from the rotating portion 6221. The engaging portion 631 can be engaged in the engaging groove 513. When it is necessary to adjust the rotation direction of the knob 51, first disengage the engaging portion 631 from the engaging groove 513, then drive the locking component 62 to rotate 180°, and then engage the engaging portion 631 in the engaging groove 513. Since the engaging groove 513 extends in a single direction and the side wall of the engaging groove 513 is a flat surface, only when the locking component 62 rotates 180°, can the engaging portion 631 be engaged in the engaging groove 513. The engaging groove 513 can also provide positioning when the locking component 62 rotates. In this embodiment, the engaging portion 631 can be spherical.

[0054] In this embodiment, the locking assembly 6 further includes a flexible pad 65. A stepped surface is provided on the side wall of the lever shaft 622, and the flexible pad 65 is disposed between the stepped surface and the bottom of the connection groove 511. When adjusting the locking member 62, the operator drags and rotates the rotating portion 6221, the stepped surface compresses the flexible pad 65, and the engaging portion 631 moves away from the engaging groove 513, realizing that the engaging portion 631 disengages from the engaging groove 513. At this time, the locking member 62 is rotated. After the locking member 62 rotates 180°, the rotating portion 6221 is released, and the flexible pad 65 drives the locking member 62 to reset, and the engaging portion 631 is embedded in the engaging groove 513 again. In this embodiment, by providing the flexible pad 65, the locking member 62 can be driven to reset, and the locking member 62 can be prevented from directly contacting the bottom of the connection groove 511, reducing the wear between the connection groove 511 and the locking member 62 and improving the service life.

[0055] Preferably, as Figure 2 and Figure 6 shown, the bending adjustment assembly 4 further includes a second traction wheel 44. The second traction wheel 44 is stop-connected to the first transmission rod 42. Two bending adjustment wires are provided on the sheath 3, and the two bending adjustment wires are respectively wound around the first traction wheel 41 and the second traction wheel 44, and the winding directions of the bending adjustment wires on the first traction wheel 41 and the second traction wheel 44 are opposite. In this embodiment, by providing the first traction wheel 41 and the second traction wheel 44 to adjust the two bending adjustment wires, when the first traction wheel 41 and the second traction wheel 44 rotate in the same direction, the driving directions of the two bending adjustment wires are the same, improving the bending adjustment efficiency of the sheath 3. In this embodiment, the first traction wheel 41 and the second traction wheel 44 are located on both sides of the bracket 2, improving the structural stability of the bending adjustment assembly 4.

[0056] In this embodiment, first stop holes are provided on the side walls of the first traction wheel 41, the second gear 43 and the second traction wheel 44, and a plurality of second stop holes 421 corresponding to the plurality of first stop holes are provided on the side wall of the first transmission rod 42. Elastic pins are inserted into the first stop holes and the second stop holes 421, realizing that the first traction wheel 41, the second gear 43 and the second traction wheel 44 are all stop-connected to the first transmission rod 42. In other embodiments, interference fit or key connection can also be used to achieve stop connection.

[0057] Further, as Figure 2 shown, a plurality of auxiliary ribs 514 and at least one indicating rib 515 are provided on the side wall of the knob 51. Through the auxiliary ribs 514, it is convenient for the operator to rotate the knob 51; through the indicating rib 515, it is convenient for the operator to understand the rotation angle of the knob 51.

[0058] Note that the above is only a preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments only. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A conveying device, characterized in that, it includes a connected handle and a sheath tube (3), the sheath tube (3) is provided with a bending adjustment wire, and the handle includes: a housing (1); a bending adjustment assembly (4) arranged inside the housing (1), the bending adjustment assembly (4) includes a first traction wheel (41), one end of the bending adjustment wire is wound around the first traction wheel (41), and the other end is connected to the sheath tube (3); a driving assembly (5) arranged outside the housing (1), the driving assembly (5) includes a knob (51), when the knob (51) rotates, the driving assembly (5) drives the first traction wheel (41) to rotate; a locking assembly (6), which includes a ratchet wheel (61), a locking member (62) and an elastic member (64), the ratchet wheel (61) is connected to the housing (1), a connecting groove (511) is arranged on one side of the knob (51) facing the ratchet wheel (61), the axis of the connecting groove (511) is not collinear with the rotation axis of the knob (51), the locking member (62) extends into the connecting groove (511), and the elastic member (64) is arranged between the locking member (62) and the bottom of the connecting groove (511); a plurality of ratchet teeth (611) are annularly arranged on the side wall of the ratchet wheel (61), a ratchet groove (612) is arranged between the plurality of ratchet teeth (611), the end of the locking member (62) away from the elastic member (64) is a locking end, the elastic member (64) can drive the locking member (62) so that the locking end is embedded in the ratchet groove (612), one side of the locking end close to one ratchet tooth (611) is a guiding surface (6211), and the side close to another ratchet tooth (611) is a locking surface (6212).

2. The conveying device according to claim 1, characterized in that, the handle further includes a bracket (2), the bracket (2) is used to connect the sheath tube (3), and the bracket (2) is provided with a second connection hole (21); the driving assembly (5) further includes a second transmission rod (52), a first gear (53), and a fixing pin (54), the knob (51) is provided with a third connection hole (516), the third connection hole (516) is located at the center of the knob (51), the second transmission rod (52) passes through the central hole of the ratchet wheel (61), and one end of the second transmission rod (52) is stop-connected to the third connection hole (516), and the other end is stop-connected to one side of the first gear (53); one end of the fixing pin (54) is rotatably connected to the other side of the first gear (53), and the other end is stop-connected to the second connection hole (21).

3. The conveying device according to claim 2, characterized in that, the bracket (2) is provided with a first connection hole; The bending adjustment assembly (4) further includes a first transmission rod (42) and a second gear (43). The first transmission rod (42) is rotatably connected to the first connection hole, and the first traction wheel (41) is fixedly connected to the first transmission rod (42); the second gear (43) is fixedly connected to the first transmission rod (42), and the second gear (43) is meshed with the first gear (53).

4. The conveying device according to claim 1, wherein, the locking member (62) includes a lever (621) and a lever shaft (622). The lever (621) is fixedly connected to the lever shaft (622), and the locking end is arranged at one end of the lever (621) away from the lever shaft (622); the elastic member (64) is a spring. The spring is sleeved on the lever shaft (622), and one end abuts against the bottom of the connection groove (511), and the other end abuts against the lever (621).

5. The conveying device according to claim 4, wherein, a through hole (512) is arranged at the bottom of the connection groove (511). A rotating part (6221) is arranged at one end of the lever shaft (622) away from the lever (621). The rotating part (6221) extends out of the through hole (512), and a driving arm (63) extending radially is arranged on the rotating part (6221).

6. The conveying device according to claim 5, wherein, a through engaging groove (513) is arranged on one side of the knob (51) away from the ratchet wheel (61). A engaging part (631) is arranged at one end of the driving arm (63) away from the rotating part (6221), and the engaging part (631) can be engaged in the engaging groove (513).

7. The conveying device according to claim 4, wherein, the locking assembly (6) further includes a flexible pad (65). A stepped surface is arranged on the side wall of the lever shaft (622), and the flexible pad (65) is arranged between the stepped surface and the bottom of the connection groove (511).

8. The conveying device according to claim 3, wherein, the bending adjustment assembly (4) further includes a second traction wheel (44). The second traction wheel (44) is fixedly connected to the first transmission rod (42). Two bending wires are arranged on the sheath tube (3), and the two bending wires are respectively wound around the first traction wheel (41) and the second traction wheel (44), and the winding directions of the bending wires on the first traction wheel (41) and the second traction wheel (44) are opposite.

9. The conveying device according to claim 1, wherein, the guiding surface (6211) is an arc surface, and the locking surface (6212) is a plane.

10. The conveying device according to claim 1, wherein, a plurality of auxiliary ribs (514) and at least one indicating rib (515) are arranged on the side wall of the knob (51).

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