Auxiliary conveying device

Abstract

The invention provides an auxiliary conveying device which comprises a base, an inner pipe, an outer pipe and an adjusting assembly, and a communicating cavity penetrating through the base is formed in the base; the inner pipe penetrates through the communicating cavity; the outer pipe is arranged on the outer side of the inner pipe in a sleeving mode and comprises a far outer pipe fixed to the inner pipe, a near outer pipe fixed to the base and an expansion part arranged between the far outer pipe and the near outer pipe. The adjusting shaft sleeve is located at the near end of the base and rotates relative to the base, the adjusting block is in threaded connection with the adjusting shaft sleeve, and the inner pipe is fixed to the adjusting block. The inner tube is driven by the adjusting assembly to move in the axial direction, so that the expansion part is extruded by external force of the near outer tube or the far outer tube, the middle of the expansion part protrudes outwards in the radial direction, the outer diameter of the expansion part is increased, a gap between an external instrument and the outer tube is reduced, and the external instrument smoothly passes through a step of a blood vessel; and the outer diameter of the expansion part is recovered to an initial state, so that the trafficability of the expansion part is improved.

Description

Technical Field

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

[0002] Interventional treatment is the minimally invasive diagnosis and treatment of diseases by introducing puncture needles, special catheters, guidewires and other precision instruments into the body's blood vessels through percutaneous puncture under the guidance of medical imaging equipment. In particular, vascular intervention technology has replaced surgery as the preferred treatment for vascular diseases in some areas. Vascular intervention technology generally involves delivering external instruments to the occluded part of the blood vessel through an auxiliary catheter, where the external instruments include but are not limited to suction catheters and distal access catheters. Due to the tortuous sections of the blood vessels and the step effect of the blood vessels, the auxiliary catheter must reduce the gap between its distal inner diameter and the distal access catheter to overcome the step effect of the blood vessel.

[0003] Currently, the distal end of the Offset auxiliary catheter is designed with a variable diameter, which can overcome the above-mentioned step effect, but the Offset auxiliary catheter can only match external instruments of a specific size, and the enlarged diameter of the distal end of the Offset auxiliary catheter also affects its own passability.

[0004] In view of this, it is necessary to design a new auxiliary conveying device to solve one of the above problems. Summary of the invention

[0005] The present invention provides a new auxiliary conveying device to solve one of the above problems.

[0006] In order to achieve the above object, the technical solution provided by the present invention is as follows:

[0007] The present invention provides an auxiliary conveying device, the auxiliary conveying device comprising:

[0008] A base, provided with a communicating cavity penetrating the base;

[0009] an inner tube passing through the communicating cavity;

[0010] An outer tube sleeved on the outer side of the inner tube, the outer tube comprising a distal outer tube fixed to the inner tube, a proximal outer tube fixed to the base, and an expanded portion arranged between the proximal outer tube and the distal outer tube;

[0011] An adjustment assembly, the adjustment assembly comprising an adjustment sleeve disposed at the proximal end of the base and rotating relative to the base, and an adjustment block threadedly connected to the adjustment sleeve;

[0012] Wherein, the inner tube is fixed to the adjusting block.

[0013] Furthermore, a thread groove is provided on the inner wall of the adjusting sleeve, and a thread matching with the thread groove is provided on at least a portion of the outer peripheral wall of the adjusting block.

[0014] Furthermore, the adjustment assembly also includes a first stop structure for limiting axial movement of the adjustment sleeve.

[0015] Further, the first stop structure includes a first fixed shaft connected to the proximal end of the base and a first stop portion fixed to the proximal end of the first fixed shaft, the first fixed shaft is located inside the adjusting sleeve, and the first fixed shaft is provided with at least one first avoidance groove for the adjusting block to pass through, and the first avoidance groove extends axially along at least part of the first fixed shaft.

[0016] Furthermore, the proximal end of the base has a docking surface facing the distal end of the adjusting sleeve, a groove formed by being recessed from the docking surface toward the distal end, and a first limiting portion located in the groove, and a plug-in groove for accommodating at least a portion of the distal end of the first fixed shaft is formed between the outer wall of the first limiting portion and the inner wall of the groove, and the connecting cavity passes through the first limiting portion.

[0017] Furthermore, one of the proximal end of the base and the distal end of the adjusting sleeve is provided with a scale ruler along its circumference, and the other is provided with a positioning mark corresponding to the scale line.

[0018] Furthermore, the enlarged portion includes at least one adjusting portion arranged along the axial direction of the outer tube, the proximal end of the adjusting portion is fixed to the distal end of the proximal outer tube, and the distal end of the adjusting portion is fixed to the proximal end of the distal outer tube.

[0019] Furthermore, the outer tube also includes developing rings respectively arranged at the proximal end and the distal end of the enlarged part.

[0020] Furthermore, the auxiliary conveying device also includes a bending adjustment wire for adjusting the curvature of the distal end of the inner tube, and a bending adjustment component fixed to the bending adjustment wire, the bending adjustment component includes a bending adjustment sleeve rotating relative to the base, and a bending adjustment block threadedly connected to the bending adjustment sleeve, the distal end of the bending adjustment wire is fixed to the distal end of the inner tube, and the proximal end of the bending adjustment wire is fixed to the bending adjustment block.

[0021] Furthermore, the bending adjustment assembly also includes a second stop structure for limiting the axial movement of the bending adjustment sleeve.

[0022] Compared with the prior art, the beneficial effect of the auxiliary delivery device of the present invention is that: the auxiliary delivery device of the present invention controls the inner tube to move toward the proximal end through an adjustment component, and the inner tube drives the distal outer tube to move toward the proximal end, so that the enlarged part is squeezed by the external force of the proximal outer tube and the distal outer tube, and the middle position of the enlarged part protrudes radially outward along the outer tube, increasing the outer diameter of the enlarged part to reduce the gap between the external device and the outer tube, so that the external device can smoothly pass through the step of the blood vessel. After passing through the step of the blood vessel, the outer diameter of the enlarged part is restored to the initial state to improve the passability of the outer tube itself; moreover, the outer diameter of the enlarged part can be adjusted to adapt to or match external devices with different inner diameter specifications, thereby improving the applicability of the auxiliary delivery device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of the enlarged portion of the auxiliary conveying device in an embodiment of the present invention in an initial state.

[0024] Figure 2 yes Figure 1 A schematic diagram of the three-dimensional structure of the expanded portion of the auxiliary conveying device in the expanded state.

[0025] Figure 3 It is a three-dimensional structural schematic diagram of the expansion portion of the auxiliary conveying device in another embodiment of the present invention in an expanded state.

[0026] Figure 4 It is a three-dimensional structural schematic diagram of the expansion portion of the auxiliary conveying device in another embodiment of the present invention in an expanded state.

[0027] Figure 5 yes Figure 4 Exploded view of the components of the auxiliary conveying device.

[0028] Figure 6 yes Figure 5 Schematic diagram of the three-dimensional structure of the middle base.

[0029] Figure 7 yes Figure 4 Cross-sectional view of the auxiliary conveying device along the AA direction.

[0030] Figure 8 yes Figure 4 Cross-sectional view of the auxiliary conveying device along direction BB.

[0031] Fig. 9 yes Figure 4 Schematic diagram of the three-dimensional structure of the inner tube in the bending state.

[0032] Among them, 10-inner tube, 11-inner layer, 12-reinforcement layer, 121-receiving groove, 13-outer layer, 20-outer tube, 21-near outer tube, 22-far outer tube, 23-expanded part, 231-adjusting part, 30-base, 31-connecting cavity, 32-joining surface, 33-groove, 34-first limiting part, 341-columnar part, 342-convex part, 35-scale ruler, 36-plug-in groove, 40-adjusting component, 41-adjusting sleeve, 411-threaded groove, 412-positioning mark, 42-adjusting block, 4 21-thread, 422-perforation, 43-first stop structure, 431-first fixed shaft, 4311-first avoidance groove, 432-first stop part, 4321-through hole, 50-bending wire, 60-bending assembly, 61-bending sleeve, 611-bending thread groove, 62-bending block, 621-bending thread, 63-second stop structure, 631-second fixed shaft, 6311-second avoidance groove, 632-second stop part, 633-second limiting part, 70-inner tube seat, 71-inner tube seat cavity. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present invention.

[0034] In various drawings of the present invention, for the convenience of illustration, some sizes of structures or parts are exaggerated relative to other structural parts, and therefore, they are only used to illustrate the basic structure of the subject matter of the present invention.

[0035] In this document, for the convenience of description, the end far away from the operator is defined as the distal end, and the end close to the operator is defined as the proximal end.

[0036] like Figures 1 to 9 As shown, the auxiliary delivery device includes an inner tube 10, an outer tube 20, a base 30 and an adjustment assembly 40, which is used to deliver external instruments to the occluded part of the blood vessel, wherein the external instruments include but are not limited to a suction catheter or a distal access catheter, and during delivery, the suction catheter or the distal access catheter is located on the outer peripheral side of the outer tube 20.

[0037] The inner tube 10 is tubular and has an inner cavity for internal instruments to pass through, wherein the internal instruments include but are not limited to guide wire-shaped conveying components and the like.

[0038] The inner tube 10 includes an inner layer 11 , a reinforcement layer 12 sleeved on the outer side of the inner layer 11 , and an outer layer 13 sleeved on the outer side of the reinforcement layer 12 . The inner layer 11 , the reinforcement layer 12 , and the outer layer 13 are composited to form the inner tube 10 .

[0039] Specifically, the inner layer 11 is made of one or more of polytetrafluoroethylene (PTFE), polyethylene (PE), etc., so that the inner layer 11 has a relatively smooth surface.

[0040] The reinforcement layer 12 is made of stainless steel, tin-titanium, platinum, platinum-tungsten, or polyamide materials, so that the reinforcement layer 2 has a certain hardness and has a certain supporting effect on the inner layer 11 and the outer layer 13.

[0041] The reinforcing layer 12 is in the shape of a corrugated tube, a woven mesh, a spring-wound mesh, or a composite mesh of woven and spring-wound mesh, so that the inner tube 10 has the properties of compliance, elasticity, resistance to breakage, and resistance to twisting.

[0042] The outer layer 13 is made of one or more materials such as nylon, polyether block polyamide (Pebax) materials, polyurethane materials (TPU), etc. to protect the reinforcement layer 12 and the inner layer 11.

[0043] A developing ring (not shown) is disposed at the distal end of the inner tube 10 , and the position and state of the inner tube 10 after entering the blood vessel can be observed with the aid of the developing ring.

[0044] like Figures 1 to 4 As shown, the outer tube 20 is sleeved on the outside of the inner tube 10, and the inner diameter of the outer tube 20 is not less than the outer diameter of the inner tube 10, so that the inner tube 10 can move axially relative to the outer tube 20 along the inner tube 10, wherein the outer tube 20 includes a proximal outer tube 21 fixed to the base 30, a distal outer tube 22 fixed to the inner tube 10, and an enlarged portion 23 arranged between the proximal outer tube 21 and the distal outer tube 22. Preferably, the distal end of the distal outer tube 22 is fixed to the distal end of the inner tube 10.

[0045] The enlarged portion 23 includes at least one adjusting portion 231 arranged axially along the outer tube 20, the proximal end of the adjusting portion 231 is fixed to the distal end of the proximal outer tube 21, and the distal end of the adjusting portion 231 is fixed to the proximal end of the distal outer tube 22. When the adjusting portion 231 is squeezed by an external force, it will protrude outward along the radial direction of the outer tube 20, so that the outer diameter of the enlarged portion 23 is larger than the outer diameters of the proximal outer tube 21 and the distal outer tube 22. At this time, the enlarged portion 23 is in an enlarged state; after the external force is removed, the adjusting portion 231 will return to its initial state, and at this time, the outer diameter of the enlarged portion 23 is not larger than the outer diameters of the proximal outer tube 21 and the distal outer tube 22.

[0046] When there are a plurality of adjusting portions 231 , the plurality of adjusting portions 231 are evenly arranged along the circumference of the outer tube 20 .

[0047] Preferably, the enlarged portion 23, the proximal outer tube 21 and the distal outer tube 22 are integrally formed to ensure the structural strength of the outer tube 20 itself. Of course, the enlarged portion 23 can also be connected between the proximal outer tube 21 and the distal outer tube 22 by bonding or welding.

[0048] The outer tube 20 is a multi-layer structure or a single-layer structure. When the outer tube 20 is a multi-layer structure, the material of the outer tube 20 is the same as the material of the inner tube 10, and will not be repeated one by one; when the outer tube 20 is a single-layer structure, the outer tube 20 is made of one or more materials such as nylon, polyether block polyamide (Pebax) material, polyurethane material (TPU), etc.

[0049] Two developing rings (not shown) are provided at intervals on the outer tube 20 . The two developing rings are respectively located at the proximal end and the distal end of the enlarged portion 23 , so that the operator can observe the position and state of the enlarged portion 23 .

[0050] The auxiliary conveying device of the present invention adjusts the outer diameter of the enlarged portion 23 through the cooperation between the base 30 and the adjustment assembly 40 .

[0051] Specifically, Figures 5 to 7 As shown, the base 30 is provided with a connecting cavity 31 which passes through the base 30 . In this embodiment, the connecting cavity 31 passes through the base 30 along the axial direction of the inner tube 10 , the inner tube 10 passes through the connecting cavity 31 , and the distal end of the inner tube 10 exceeds the base 30 .

[0052] Preferably, the inner diameter of the distal end of the connecting cavity 31 is smaller than the inner diameter of its proximal end, and the inner diameter of the distal end of the connecting cavity 31 matches the outer diameter of the proximal outer tube 21, so as to facilitate the fixing of the proximal outer tube 21 at the distal end of the base 30 and ensure that the base 30 and the outer tube 20 are coaxially arranged; at the same time, the design that the inner diameter of the proximal end of the connecting cavity 31 is larger than the inner diameter of the distal end facilitates the operation of the inner tube 10 passing through the connecting cavity 31.

[0053] like Figure 5 and Figure 7 As shown, the adjustment assembly 40 includes an adjustment sleeve 41 located at the proximal end of the base 30 and radially rotating relative to the base 30, and an adjustment block 42 threadedly connected to the adjustment sleeve 41, and the adjustment block 42 is fixed to the inner tube 10. When the adjustment sleeve 41 is rotated, the adjustment block 42 moves axially along the adjustment sleeve 41, and the adjustment block 42 drives the inner tube 10 to move axially along the inner tube 10.

[0054] The outer diameter of the adjusting sleeve 41 is the same as the outer diameter of the base 30 , and the outer surface of the adjusting sleeve 41 and the outer surface of the base 30 are on the same plane, so that the appearance of the auxiliary conveying device is neat.

[0055] The inner wall of the adjusting sleeve 41 is provided with a thread groove 411 , and at least a portion of the outer peripheral wall of the adjusting block 42 is provided with a thread 421 matched with the thread groove 411 .

[0056] The thread 421 is arranged on two opposite sides of the adjustment block 42, preferably located at the two end sides of the adjustment block 42 arranged in the length direction or extension direction, reducing the contact area between the adjustment block 42 and the adjustment sleeve 41, and improving the smoothness of the rotation of the adjustment sleeve 41. At the same time, the force between the adjustment block 42 and the adjustment sleeve 41 is balanced, increasing the structural strength of the adjustment assembly 40.

[0057] The adjusting block 42 is fixed to the inner tube 10 by bonding or welding. Preferably, the adjusting block 42 is provided with a through hole 422 for the inner tube 10 to pass through, the inner tube 10 passes through the through hole 422 and is fixed to the adjusting block 42, and the inner tube 10 is coaxially arranged with the adjusting sleeve 41.

[0058] When the adjusting block 42 drives the inner tube 10 to move toward the proximal end, the distal outer tube 22 moves toward the proximal end along with the inner tube 10, and the enlarged portion 23 is squeezed by the external force of the proximal outer tube 21 and the distal outer tube 22. The middle position of the enlarged portion 23 bulges radially outward along the outer tube 20, that is, the outer diameter of the enlarged portion 23 becomes larger. At this time, the enlarged portion 23 is in an enlarged state.

[0059] When the enlarged portion 23 is in the enlarged state, the adjusting sleeve 41 is rotated in the opposite direction relative to the base 30, the adjusting block 42 drives the inner tube 10 to move toward the distal end, and the distal outer tube 22 moves toward the distal end with the inner tube 10, the proximal outer tube 21 and the distal outer tube 22 reduce the squeezing of the enlarged portion 23, the radial outward protrusion amplitude of the enlarged portion 23 along the outer tube 20 is reduced, and the outer diameter of the enlarged portion 23 is reduced; the adjusting sleeve 41 is continued to be rotated in the opposite direction, the adjusting block 42 drives the inner tube 10 to continue to move toward the distal end, and the distal outer tube 22 continues to move toward the distal end with the inner tube 10, until the proximal outer tube 21 and the distal outer tube 22 release the squeezing of the enlarged portion 23, and the outer diameter of the enlarged portion 23 is reduced to be not greater than the outer diameter of the outer tube 20, at which time, the enlarged portion 23 returns to its initial state.

[0060] In this embodiment, the adjusting sleeve 41 is rotated clockwise relative to the base 30 to change the expansion portion 23 from the initial state to the expansion state, which facilitates the outer tube 20 and the external instrument to pass through the step of the blood vessel. After the outer tube 20 and the external instrument have passed through the step of the blood vessel, the adjusting sleeve 41 is rotated counterclockwise to restore the expansion portion 23 from the expansion state to the initial state.

[0061] In a specific embodiment, when the external instrument specification matched with the auxiliary delivery device is 6F, the outer diameter range of the enlarged portion 23 is 0.058 inches to 0.068 inches; when the external instrument size is 7F, the outer diameter range of the enlarged portion 23 is 0.07 inches to 0.086 inches; when the external instrument size is 8F, the outer diameter range of the enlarged portion 23 is 0.07 inches to 0.095 inches, wherein F is a tube diameter constant, for example, 6F means an outer diameter circumference of 6 mm.

[0062] As a preferred embodiment of the present invention, Figure 5 and Figure 7 As shown, the adjustment assembly 40 further includes a first stop structure 43 for limiting the axial movement of the adjustment sleeve 41 to prevent the adjustment sleeve 41 from falling off from the proximal end of the base 30 .

[0063] The first stop structure 43 includes a first fixed shaft 431 connected to the proximal end of the base 30 and a first stop portion 432 fixed to the proximal end of the first fixed shaft 431. The first fixed shaft 431 is located inside the adjusting sleeve 41 and is coaxially arranged with the adjusting sleeve 41. The adjusting sleeve 41 is restricted between the base 30 and the first stop portion 432. At this time, the adjusting sleeve 41 abuts against the proximal end of the base 30 to prevent the adjusting sleeve 41 from falling off from the proximal end of the base 30.

[0064] It is understandable that the first fixed shaft 431 can be arranged in close contact with the inner wall of the adjusting sleeve 41 , or can be arranged at a distance from the inner wall of the adjusting sleeve 41 .

[0065] In this embodiment, the first fixed shaft 431 is plugged and fixed to the base 30. Specifically, Figure 6 As shown, the proximal end of the base 30 has a docking surface 32 facing the adjusting sleeve 41, a groove 33 formed by being recessed from the docking surface 32 to the distal end, and a first limiting portion 34 located in the groove 33, and a plug-in groove 36 for accommodating at least a portion of the distal end of the first fixed shaft 431 is formed between the outer wall of the first limiting portion 34 and the inner wall of the groove 33, and the connecting cavity 31 passes through the first limiting portion 34.

[0066] When the adjustment assembly 40 is installed on the base 30, the distal end of the first fixed shaft 431 is located in the insertion groove 36, and at least a portion of the first limiting portion 34 is located in the inner cavity of the first fixed shaft 431. The first fixed shaft 431 and the base 30 are plugged and fixed to each other, which can effectively prevent the first fixed shaft 431 from falling off the base 30.

[0067] At least one first avoidance groove 4311 for the adjustment block 42 to pass through is disposed on the first fixed shaft 431 . The first avoidance groove 4311 extends axially along at least a portion of the first fixed shaft 431 to guide the movement of the adjustment block 42 .

[0068] When threads 421 are provided on both opposite sides of the adjustment block 42, two first avoidance grooves 4311 are provided, and the two first avoidance grooves 4311 are relatively arranged on both sides of the radial direction of the first fixed axis 431, and the width of the first avoidance groove 4311 is equal to the thickness of the adjustment block 42 along the width direction of the first avoidance groove 4311, so as to prevent the adjustment block 42 from shaking during the movement, so as to improve the overall structural strength of the auxiliary conveying device.

[0069] In this embodiment, Figure 5 and Figure 6 As shown, the first limiting portion 34 includes a columnar portion 341 and a convex portion 342, and the convex portion 342 corresponds to the position of the first avoidance groove 4311. When the first fixed shaft 431 is located in the plug-in groove 36, the columnar portion 341 is located in the inner cavity of the first fixed shaft 431, and the convex portion 342 is plugged into the first avoidance groove 4311, further improving the bonding strength between the first fixed shaft 431 and the base 30.

[0070] Preferably, the outer diameter of the first fixed shaft 431 is not less than the outer diameter of the columnar portion 341, and the outer diameter of the first fixed shaft 431 is not greater than the inner diameter of the adjusting sleeve 41. When the adjusting assembly 40 is installed on the base 30, the first fixed shaft 431 is fixedly connected to the first limiting portion 34 to prevent the first stop structure 43 from rotating during the rotation of the adjusting sleeve 41.

[0071] Further, the first stopper 432 is fixed to the proximal end of the first fixed shaft 431, and at least part of the distal end of the first stopper 432 abuts against the proximal end of the adjusting sleeve 41, the outer diameter of the first stopper 432 is the same as the outer diameter of the adjusting sleeve 41, and the outer surface of the first stopper 432 and the outer surface of the adjusting sleeve 41 are on the same plane, so that the auxiliary conveying device has a relatively simple appearance. In this embodiment, the first stopper 432 is cylindrical.

[0072] In this embodiment, a through hole 4321 penetrating along the axial direction for the inner tube 10 to pass through is provided on the first stopper 432 , and the through hole 4321 is located in the middle of the first stopper 432 .

[0073] Of course, the first stop structure 43 may also be other structures arranged on the inner side or the outer side of the adjusting sleeve 41. When the adjusting sleeve 41 rotates relative to the base 30, as long as the first stop structure 43 can prevent the adjusting sleeve 41 from falling off the base 30, it is within the protection scope of the present invention.

[0074] As another preferred embodiment of the present invention, Figure 3 , Figure 4 and Fig. 9 As shown, one of the proximal end of the base 30 and the distal end of the adjustment component 40 is provided with a scale ruler 35 extending along its circumference, and a plurality of scale lines are provided on the scale ruler 35; the other is provided with a positioning mark 412 corresponding to the scale ruler 35. During the rotation of the adjustment component 40 relative to the base 30, the rotation amplitude of the adjustment component 40 can be accurately controlled, the moving distance of the adjustment block 42 can be controlled, and then the precise size of the outer diameter of the expansion portion 23 can be accurately controlled, so that the auxiliary conveying device can match external instruments with a variety of different inner diameter specifications.

[0075] Preferably, the scale ruler 35 is arranged at the proximal end of the base 30, and the positioning mark 412 is arranged on the outer side of the distal end of the adjusting sleeve 41. In this embodiment, the scale ruler 35 is a scale groove recessed downward from the surface of the base 30. At the same time, this embodiment does not limit the specific shape of the positioning mark 412.

[0076] When the initial position of the scale 35 is aligned with the positioning mark 412, the outer tube 20 is in an initial state relative to the inner tube 10, and at this time, the expanded portion 23 is also in an initial state.

[0077] It is understandable that the precise adjustment of the specific size of the outer diameter of the expanded portion 23 depends not only on the rotation amplitude of the adjusting sleeve 41 relative to the base 30 , but also on the design parameters of the thread 421 and the length of the adjusting portion 231 .

[0078] The auxiliary delivery device further comprises an inner tube seat 70 connected to the proximal end of the inner tube 10, the inner tube seat 70 is relatively located at the proximal end of the base 30, and is used to assist the internal instrument to enter the inner tube 10. The inner tube seat 70 has an inner tube seat cavity 71 connected to the inner cavity of the inner tube 10, and the inner tube seat cavity 71 is coaxially arranged with the inner cavity of the inner tube 10.

[0079] Based on any of the above embodiments, Figures 4 to 9As shown, the auxiliary conveying device also includes a bending adjustment wire 50 for adjusting the curvature of the distal end of the inner tube 10, and a bending adjustment component 60 fixed to the bending adjustment wire 50, wherein the distal end of the bending adjustment wire 50 is fixed to the distal end of the inner tube 10, and the proximal end of the bending adjustment wire 50 passes through the base 30 and is fixed on the bending adjustment component 60. In this embodiment, the bending adjustment component 60 is located on the side of the base 30, and the bending adjustment wire 50 passes through the side wall of the base 30 and is fixed to the bending adjustment component 60.

[0080] In this embodiment, at least a portion of the tube wall of the reinforcement layer 12 of the inner tube 10 is provided with a receiving groove 121 extending along the axial direction. The receiving groove 121 is used to receive the bending adjustment wire 50 and allow the bending adjustment wire 50 to move in the receiving groove 121 .

[0081] It can be understood that, since the reinforcing layer 12 is a braided structure, when the bending adjustment wire 50 is located in the reinforcing layer 12 , the thickness of the reinforcing layer 12 around the bending adjustment wire 50 is deformed and increased.

[0082] Preferably, the bending adjustment wire 50 is in the shape of a guide wire, and the bending adjustment wire 50 is made of one or a composite of platinum-iridium alloy and platinum-tungsten alloy.

[0083] The bending adjustment wire 50 may be provided with one wire to adjust the inner tube 10 to bend in one direction. When the inner tube 10 needs to pass through tortuous sections in different directions, the auxiliary delivery catheter may be appropriately rotated circumferentially during the operation so that the bending direction of the inner tube 10 matches the tortuous direction of the blood vessel.

[0084] Of course, the bending adjustment wires 50 may also be provided in plurality, and the inner tube 10 may be bent in different directions according to the direction of the blood vessel tortuosity. Taking the case where two bending adjustment wires 50 are provided as an example, two bending adjustment components 60 are also provided accordingly, and the bending adjustment components 60 are arranged in one-to-one correspondence with the bending adjustment wires 50. A suitable bending adjustment component 60 is selected according to the direction of the blood vessel tortuosity, and then the bending adjustment wire 50 corresponding to the above-mentioned bending adjustment wire 60 is adjusted.

[0085] Furthermore, if Figure 5 and Figure 7As shown, the bending adjustment assembly 60 includes a bending adjustment sleeve 61 that rotates relative to the base 30, and a bending adjustment block 62 that is threadedly connected to the bending adjustment sleeve 61. The inner cavity of the adjusting sleeve 61 is connected to the receiving groove 121. The proximal end of the bending adjustment wire 50 passes through at least a part of the side wall of the base 30, enters the adjusting sleeve 61, and is fixed on the bending adjustment block 62. When the auxiliary delivery device delivers the internal device through the tortuous section of the blood vessel, the bending adjustment assembly 60 adjusts the bending adjustment wire 50 to move toward the proximal end. After the distal end of the inner tube 10 is subjected to an external force in the proximal direction, a part of the distal end of the inner tube 10 is bent laterally, so that the inner tube 10 and the internal device can smoothly pass through the tortuous section of the blood vessel, thereby improving the passability of the delivery auxiliary device.

[0086] The bending adjustment sleeve 61 is provided with a bending adjustment thread groove 611, and at least part of the outer peripheral wall of the bending adjustment block 62 is provided with a bending adjustment thread 621 that cooperates with the bending adjustment thread groove 611. The bending adjustment sleeve 61 and the above-mentioned adjustment sleeve 41 have the same structure, and the specific structure of the bending adjustment block 62 is the same as that of the above-mentioned adjustment block 42, which will not be described one by one.

[0087] The bending adjustment assembly 60 also includes a second stop structure 63 for limiting the axial movement of the bending adjustment sleeve 61. The second stop structure 63 includes a second fixed shaft 631 fixed to the side of the base 30 and a second stop portion 632 located at the far end of the second fixed shaft 631. The bending adjustment sleeve 61 is sleeved on the outside of the second fixed shaft 631. The second fixed shaft 631 is provided with at least one second avoidance groove 6311. The second avoidance groove 6311 extends along the axial direction of at least part of the second fixed shaft 631. The bending adjustment block 62 passes through the second avoidance groove 6311 and is threadedly connected to the bending adjustment sleeve 61.

[0088] The second stop portion 632 is provided with a fixing groove (not shown) for fixing the second fixed shaft 631 at one end away from the base 30, so as to fix the second stop portion 632 on the second fixed shaft 631. At the same time, at least part of the distal end of the second stop portion 632 abuts against at least part of the proximal end of the bending adjustment sleeve 61.

[0089] The outer diameter of the second stopper 632 is the same as the outer diameter of the bending adjustment sleeve 61 , so that the appearance of the bending adjustment assembly 60 is neat.

[0090] In this embodiment, the length of the second fixed shaft 631 is greater than the length of the bending adjustment sleeve 61, and a second limiting portion 633 is also provided on the second fixed shaft 631. The bending adjustment sleeve 61 is limited between the second stop portion 632 and the second limiting portion 633, and the second avoidance groove 6311 is located on the side of the second limiting portion 633 away from the base 30.

[0091] To summarize, the auxiliary delivery device of the present invention controls the inner tube 10 to move proximally through the adjustment component 40, and the inner tube 10 drives the distal outer tube 22 to move proximally, and the enlarged portion 23 is squeezed by the external force of the proximal outer tube 21 and the distal outer tube 22, and the middle position of the enlarged portion 23 protrudes outward along the radial direction of the outer tube 20, thereby increasing the outer diameter of the enlarged portion 23 to reduce the gap between the external device outside the auxiliary delivery device and the outer tube 20, so that the external device can pass through the step of the blood vessel smoothly. After passing through the step of the blood vessel, the enlarged portion 23 is restored to its initial state to improve the passability of the outer tube 20 itself; moreover, the outer diameter of the enlarged portion 23 can be adjusted to adapt to or match external devices with different inner diameter specifications, thereby improving the applicability of the auxiliary delivery device.

[0092] It should be understood that although the present specification is described according to embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0093] The series of detailed descriptions listed above are only specific descriptions of feasible embodiments of the present invention and are not intended to limit the protection scope of the present invention. All equivalent embodiments or changes that do not deviate from the technical spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. An auxiliary conveying device, characterized in that: include: A base, provided with a communicating cavity penetrating the base; an inner tube passing through the communicating cavity; An outer tube sleeved on the outer side of the inner tube, the outer tube comprising a distal outer tube fixed to the inner tube, a proximal outer tube fixed to the base, and an expanded portion arranged between the proximal outer tube and the distal outer tube; An adjustment assembly, the adjustment assembly comprising an adjustment sleeve located at the proximal end of the base and rotating relative to the base, and an adjustment block threadedly connected to the adjustment sleeve; Wherein, the inner tube is fixed to the adjusting block.

2. The auxiliary conveying device according to claim 1, characterized in that: The inner wall of the adjusting sleeve is provided with a thread groove, and at least part of the outer peripheral wall of the adjusting block is provided with a thread matching with the thread groove.

3. The auxiliary conveying device according to claim 2, characterized in that: The adjustment assembly also includes a first stop structure for limiting the axial movement of the adjustment sleeve.

4. The auxiliary conveying device according to claim 3, characterized in that: The first stop structure includes a first fixed shaft connected to the proximal end of the base and a first stop portion fixed to the proximal end of the first fixed shaft, the first fixed shaft is located inside the adjusting sleeve, the first fixed shaft is provided with at least one first avoidance groove for the adjusting block to pass through, and the first avoidance groove extends along the axial direction of at least part of the first fixed shaft.

5. The auxiliary conveying device according to claim 4, characterized in that: The proximal end of the base has a docking surface facing the distal end of the adjusting sleeve, a groove formed by being recessed from the docking surface toward the distal end, and a first limiting portion located in the groove, an inserting groove for accommodating at least a portion of the distal end of the first fixed shaft is formed between the outer wall of the first limiting portion and the inner wall of the groove, and the connecting cavity passes through the first limiting portion.

6. The auxiliary conveying device according to claim 2, characterized in that: One of the proximal end of the base and the distal end of the adjusting sleeve is provided with a scale along its circumference, and the other is provided with a positioning mark corresponding to the scale.

7. The auxiliary conveying device according to claim 1, characterized in that: The enlarged portion includes at least one adjusting portion arranged along the axial direction of the outer tube, the proximal end of the adjusting portion is fixed to the distal end of the proximal outer tube, and the distal end of the adjusting portion is fixed to the proximal end of the distal outer tube.

8. The auxiliary conveying device according to claim 1, characterized in that: The outer tube also includes developing rings respectively arranged at the proximal end and the distal end of the enlarged part.

9. The auxiliary conveying device according to any one of claims 1 to 8, characterized in that: The auxiliary conveying device also includes a bending adjustment wire for adjusting the curvature of the distal end of the inner tube, and a bending adjustment assembly fixed to the bending adjustment wire. The bending adjustment assembly includes a bending adjustment sleeve that rotates relative to the base and a bending adjustment block threadedly connected to the bending adjustment sleeve. The distal end of the bending adjustment wire is fixed to the distal end of the inner tube, and the proximal end of the bending adjustment wire is fixed to the bending adjustment block.

10. The auxiliary conveying device according to claim 9, characterized in that: The bending adjustment assembly also includes a second stop structure for limiting the axial movement of the bending adjustment sleeve.

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