A proximal end structure of a conveyor and a conveying system

Abstract

The present invention belongs to the technical field of medical devices. The present invention proposes a proximal structure of a conveyor and a conveying system, wherein the proximal structure of the conveyor includes a conveyor, a proximal part arranged at the proximal end of the conveyor, and a catheter connected to the proximal part, a proximal inner cavity is arranged in the proximal inner cavity, and the proximal end of the catheter is arranged in the proximal inner cavity, and the proximal end of the catheter is provided with a guide portion for guiding the guide wire to penetrate into the catheter. Through the above-mentioned technical features of the present invention, the conveyor has the function of replacing the guide wire twice, and the guide portion is provided so that the guide wire can pass through the proximal inner cavity smoothly, thereby completing the task of replacing the guide wire; secondly, it ensures that when the guide wire enters the catheter, the surface coating will not be scratched by the catheter port, and the guide wire head will not hit the gap between the catheter and the proximal inner cavity, and ensures that the guide wire can smoothly penetrate into the catheter.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and in particular relates to a proximal end structure of a conveyor and a conveying system. Background Art

[0002] In recent years, interventional treatment of cardiovascular diseases has become an important means of curing patients. Interventional treatment usually uses stents to treat or alleviate lesions in the human body.

[0003] Currently, intraluminal stent products on the market are mainly divided into two categories, namely vascular stents and non-vascular stents. This type of stent generally uses a compressible stent and compresses it into a hollow sheath. Through the puncture port of the human lumen or the opening of the human organ, the stent compressed in the catheter is delivered to the lesion site under the monitoring of digital images, and then the stent is released and expanded in a certain way. Relying on the radial support force of the stent itself and the contraction force of the human lumen itself, the stent is fixed in a specific position to achieve the purpose of treating or alleviating the disease.

[0004] During the stent implantation process, a delivery device is required to transport the stent. First, a guidewire is used to establish an implantation track, and then the delivery device sheath, which is pre-installed with the stent, is pushed to the lesion under the guidance of the guidewire.

[0005] In existing delivery devices, especially intra-iliac delivery devices, doctors need to replace the guide wire through the proximal part of the delivery device under special circumstances. Replacing the guide wire twice through the delivery device can reduce the operation time and blood loss.

[0006] However, the structure of the existing conveyor cannot meet this requirement. Therefore, it is necessary to optimize the inner cavity structure of the conveyor catheter and proximal part to solve the above problem. Summary of the Invention

[0007] The purpose of the present invention is to at least solve the problem of the inconvenience of replacing the catheter of the conveyor twice, so that the guide wire can be smoothly inserted into the catheter.

[0008] One aspect of the present invention proposes a proximal structure of a conveyor, comprising a proximal piece arranged at the proximal end of the conveyor and a catheter connected to the proximal piece, wherein a proximal inner cavity is provided in the proximal piece, the proximal end of the catheter is provided in the proximal inner cavity, and the proximal end of the catheter is provided with a guide portion for guiding a guide wire to penetrate into the catheter.

[0009] According to the proximal structure of the conveyor of the present invention, a guide portion is provided at the proximal end of the catheter, so that the conveyor has the function of replacing the guide wire twice. By providing the guide portion, the guide wire can smoothly pass through the proximal inner cavity, thereby completing the task of replacing the guide wire; secondly, it is ensured that when the guide wire enters the catheter, the surface coating will not be scratched by the catheter opening, and the guide wire head will not hit the gap between the catheter and the proximal inner cavity, thereby ensuring that the guide wire can smoothly penetrate the catheter.

[0010] In addition, the proximal end structure of the conveyor according to the present invention may also have the following additional technical features:

[0011] In some embodiments of the present invention, the guide portion includes a connecting end connected to the catheter and a guide cavity that is flared and used to accommodate a guide wire, and the cross-sectional area of ​​the guide cavity away from the catheter is larger than the cross-sectional area of ​​the guide cavity close to the catheter.

[0012] In some embodiments of the present invention, the connecting end is detachably connected to the proximal end of the catheter, and a guide extension tube is provided between the connecting end and the guide cavity.

[0013] In some embodiments of the present invention, a sealing ring is provided between the connecting end and the guide cavity, a slit is provided in the middle of the sealing ring for preventing liquid leakage and allowing a guide wire to pass through, and the guide portion further includes a puncture guide for expanding the sealing ring.

[0014] In some embodiments of the present invention, the proximal inner cavity passes through the proximal part, and the proximal inner cavity sequentially includes a mounting hole for accommodating the catheter, a guide hole for guiding the guide wire, and an external assembly hole for connecting an external element, and the guide part includes a guide cavity arranged at the proximal end of the catheter.

[0015] In some embodiments of the present invention, a step surface is provided at one end of the mounting hole connected to the guide hole, and a cross-sectional area of ​​the end of the guide hole connected to the mounting hole is smaller than a cross-sectional area of ​​the end of the guide hole connected to the external assembly hole.

[0016] In some embodiments of the present invention, an abutment portion is provided at the other end of the mounting hole away from the guide hole, a rebound component is provided between the abutment portion and the guide portion, and the rebound component is used to drive the guide portion to fit against the step surface.

[0017] In some embodiments of the present invention, a locking end cap is provided between the proximal member and the catheter, a sealing member is provided inside the locking end cap, and the sealing member is used to seal the gap between the proximal inner cavity and the catheter.

[0018] In some embodiments of the present invention, the proximal member is provided with an inner cavity extension portion at one end facing the conveyor, the locking end cap is provided at the front end of the inner cavity extension portion, and the sealing member is provided between the catheter and the inner cavity extension portion.

[0019] In some embodiments of the present invention, the proximal member is provided with an auxiliary wire threading assembly connected to the proximal inner cavity, and the auxiliary wire threading assembly includes a driving wheel rotatably connected to the proximal member and a driving member for driving the driving wheel to rotate.

[0020] In some embodiments of the present invention, the auxiliary wire threading assembly further comprises a pressure wheel rotatably connected to the proximal end member, and a gap for the guide wire to pass through is formed between the driving wheel and the pressure wheel.

[0021] Another aspect of the present invention further provides a delivery system, which includes a proximal structure of a delivery device as described above, wherein a sheath is provided at the front end of the delivery device, and the catheter is connected to the sheath through a connector body. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the overall structure of the conveyor in Example 1 of the present invention;

[0023] Figure 2 Schematic diagram of the proximal end structure of the conveyor in Example 1 of the present invention;

[0024] Figure 3 In the first embodiment of the present invention Figure 2 A magnified view of the structure at A;

[0025] Figure 4 Schematic diagram of the assembly structure of the catheter and the proximal inner cavity in Example 1 of the present invention;

[0026] Figure 5 Schematic diagram of the proximal end structure of the conveyor in the second embodiment of the present invention;

[0027] Figure 6 In the second embodiment of the present invention Figure 5 A magnified view of the structure at B;

[0028] Figure 7 This is a schematic diagram of the assembly structure of the catheter and the proximal inner cavity in the second embodiment of the present invention.

[0029] Figure 8 Schematic diagram of the proximal structure of the conveyor in embodiment 3 of the present invention.

[0030] Figure 9 Schematic diagram of the structure of the sealing ring in the third embodiment of the present invention;

[0031] Figure 10 Schematic diagram of the assembly structure of the guide portion and the proximal inner cavity in the third embodiment of the present invention;

[0032] Figure 11 Schematic diagram of the proximal end structure of the conveyor in the fourth embodiment of the present invention;

[0033] Figure 12 In the fourth embodiment of the present invention Figure 11 A magnified view of the structure at C;

[0034] Figure 13 Schematic diagram of the assembly structure of the catheter and the proximal inner cavity in the fourth embodiment of the present invention;

[0035] Figure 14 This is a structural diagram of a fourth embodiment of the present invention in which there is no installation gap between the conduit and the step surface;

[0036] Figure 15 This is a structural schematic diagram of a fourth embodiment of the present invention in which a mounting gap exists between the conduit and the step surface;

[0037] Figure 16 Schematic diagram of the assembly structure of the catheter and the proximal inner cavity in the fifth embodiment of the present invention;

[0038] Figure 17 Schematic diagram of the assembly structure of the auxiliary wire threading assembly and the proximal inner cavity in Example 6 of the present invention;

[0039] Figure 18 This is a schematic diagram of the internal structure of the proximal part in Example 6 of the present invention.

[0040] The reference numerals in the accompanying drawings represent the following:

[0041] 100, conveyor; 101, TIP head; 102, sheath; 103, lock key; 104, snap hook; 105, fixed push rod connector; 106, proximal end piece; 107, locking end cap; 108, catheter; 109, connector body; 110, connector gland; 111, outer shell; 112, protective cover;

[0042] 10. Guide wire; 11. Soft head; 20. Proximal inner cavity; 21. Mounting hole; 211. Step surface; 212. Abutment portion; 213. Resilient component; 22. Guide hole; 23. External assembly hole; 30. Guide portion; 31. Connecting end; 311. Snap-fit ​​groove; 32. Guide cavity; 33. Guide extension tube; 34. Conical guide port; 35. Puncture guide; 40. Seal; 401. Plug hole; 41. Sealing ring; 411. Slit; 42. Inner cavity extension; 50. Auxiliary wire threading assembly; 51. Driving wheel; 52. Pressure wheel; 53. Handwheel; 54. Locking assembly; 541. Fixed locking hole; 542. Pin. DETAILED DESCRIPTION

[0043] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0044] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0045] Although the terms first, second, third, etc. may be used herein to describe multiple elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms may only be used to distinguish one element, component, region, layer, or section from another region, layer, or section. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order.

[0046] For ease of description, spatially relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figures, such as "inside," "outside," "inside," "outside," "below," "below," "above," and the like. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures.

[0047] For ease of description, the following description uses the terms "front end" and "proximal end", where "proximal end" refers to the end close to the operator and "front end" refers to the end away from the operator. The phrase "axial direction" should be understood in this patent to mean the direction in which the interventional instrument is pushed in and out, and the direction perpendicular to the "axial direction" is defined as the "radial direction".

[0048] Example 1, a proximal structure of a conveyor, such as Figures 1 to 4 As shown, it includes a sheath tube 102 arranged at the front end of the conveyor 100, and a sheath core is arranged in the sheath tube 102. Since the sheath core is arranged in the sheath tube 102, it is not visible in the figure. A TIP head 101 is provided at the front end of the sheath core. A proximal end piece 106 is provided at the proximal end of the conveyor 100, and a driving mechanism is provided in the conveyor 100. The driving mechanism can drive the sheath tube 102 to move relative to the sheath core. The specific structure of the driving mechanism is not shown in the accompanying drawings. It should be noted that the driving mechanism is not the focus of protection of this application. Any transmission structure that can drive the sheath tube 102 to move can be applied to this application, such as a gear assembly, a pulley assembly, etc.

[0049] During the interventional surgery, when the stent is implanted through the conveyor 100, the stent is placed in the gap between the sheath core and the sheath tube 102. The doctor operates the conveyor 100 to move the sheath tube 102 to a predetermined position, and then operates the driving mechanism to withdraw the sheath tube 102 relative to the sheath core, so that the stent gradually unfolds. The stent is fixed in the predetermined position by relying on the radial support force of the stent itself and the contraction force of the human body's lumen itself.

[0050] During the interventional procedure, many emergencies may occur that require the replacement of the guide wire 10, for example, the stent implantation position is not ideal, or the guide wire 10 needs to be reinserted for multiple positioning when implanting a branch stent, or the doctor needs to replace the guide wire 10 under other special circumstances during the delivery of an intra-iliac stent, and so on.

[0051] When the guide wire 10 of the existing delivery device 100 needs to be replaced, the delivery device 100 is usually withdrawn from the human body lumen, the guide wire 10 is replaced outside the human body, and the delivery device 100 is reinserted into the human body lumen after the guide wire 10 is replaced. This method of replacing the guide wire 10 is time-consuming and labor-intensive, and increases the duration of the operation and the amount of blood loss.

[0052] In response to the above problems, the present application proposes a conveyor 100 structure that can quickly replace the guide wire 10, wherein a proximal inner cavity 20 is provided inside the proximal part 106, and the proximal inner cavity 20 penetrates the proximal part 106 along the axial direction of the proximal part 106, and a catheter 108 is provided inside the conveyor 100, one end of the catheter 108 is connected to the sheath 102, and the other end of the catheter 108 is connected to the proximal inner cavity 20.

[0053] If the guidewire 10 needs to be quickly replaced during an interventional procedure, the doctor can directly withdraw the guidewire 10 through the proximal lumen 20, since it is connected to the catheter 108. The doctor can then insert a new guidewire 10 into the catheter 108 through the proximal lumen 20. Therefore, the doctor does not need to remove the entire delivery device 100 from the human body's lumen before replacing the guidewire 10. Instead, the doctor can directly replace the guidewire 10 during the implantation process through the proximal lumen 106, saving surgical time and reducing blood loss.

[0054] During the implantation of the internal iliac stent, since the iliac artery and its branch vessels have curved parts, the head of the guide wire 10 needs to be bent to adapt to the shape of the blood vessel when the guide wire 10 establishes an implantation path.

[0055] In order to facilitate the bending of the head of the guide wire 10, a deformable soft head 11 is provided at the head of the guide wire 10, so as to facilitate the doctor to bend it into different shapes according to actual needs.

[0056] However, due to the inevitable gap between the catheter 108 and the proximal lumen 20, the curved soft tip 11 of the guidewire 10 cannot smoothly pass through the proximal lumen 20 and enter the catheter 108. In this case, the soft tip 11 is easily stuck in the gap between the catheter 108 and the proximal lumen 20, and the doctor needs to make multiple attempts to insert the guidewire 10 into the catheter 108. Moreover, even if the doctor successfully inserts the guidewire 10 into the catheter 108 after multiple attempts, the coating on the surface of the guidewire 10 is easily scratched due to the sharp opening of the catheter 108.

[0057] Therefore, if Figure 4 and Figure 5 As shown, a guide portion 30 is provided at the proximal end of the catheter 108 , and the guide portion 30 is used to guide the guide wire 10 into the catheter 108 , thereby eliminating the influence of the gap between the catheter 108 and the proximal inner cavity 20 on the guide wire 10 being inserted into the catheter 108 .

[0058] Specifically, in order to allow the guide wire 10 to smoothly pass through the proximal part 106 of the conveyor 100 and enter the catheter 108, first, the proximal part 106 of the conveyor 100 is optimized, and a proximal inner cavity 20 is set in the proximal part 106. The proximal inner cavity 20 penetrates the proximal part 106 in the axial direction, so that the guide wire 10 can directly enter the catheter 108 through the proximal part 106.

[0059] The proximal inner cavity 20 of the present application penetrates the proximal end member 106 so that the guide wire 10 can directly enter the catheter 108 via the proximal end member 106. The proximal inner cavity 20 includes, from the front end to the proximal end, a mounting hole 21 for accommodating the catheter 108, a guide hole 22, and an external assembly hole 23 for connecting external components. The mounting hole 21 and the external assembly hole 23 are connected through the guide hole 22. The guide hole 22 is used as a transition between the external assembly hole 23 and the mounting hole 21, so that the guide wire 10 can smoothly enter the mounting hole 21 after being inserted from the external assembly hole 23.

[0060] In this embodiment, the external assembly hole 23 is a Luer connector assembly hole.

[0061] In addition, a guide portion 30 is provided at the proximal end of the catheter 108. The guide portion 30 includes a connecting end 31 and a guide cavity 32. The connecting end 31 is used to connect to the catheter 108. The guide cavity 32 is flared and is used to accommodate the guide wire 10. The cross-sectional area of ​​the guide cavity 32 away from the catheter 108 is larger than the cross-sectional area of ​​the guide cavity 32 close to the catheter 108.

[0062] The expanded maximum outer diameter of the guide cavity 32 seamlessly fits with the inner wall of the proximal inner cavity 20. When the guide wire 10 is inserted into the catheter 108 along the proximal inner cavity 20, the guide wire 10 can slide smoothly into the catheter 108 along the inner wall of the guide cavity 32, thereby avoiding the head of the guide wire 10 being stuck in the gap between the catheter 108 and the proximal inner cavity 20 or the catheter 108 mouth scratching the coating on the surface of the guide wire 10.

[0063] In this embodiment, the connecting end portion 31 is integrally formed with the conduit 108. During the manufacturing process of the conduit 108, the conduit 108 is expanded to form the connecting end portion 31 and the expanded guide cavity 32.

[0064] In another embodiment, the proximal inner cavity 20 may further include a mounting hole 21 and an external assembly hole 23 , and the diameter of the mounting hole 21 is equal to the diameter of the external assembly hole 23 , so there is no need to set a guide hole 22 for transition.

[0065] In this embodiment, a sealing ring 41 is disposed between the connecting end 31 and the guide cavity 32. A slit 411 is provided in the middle of the sealing ring 41 to prevent fluid leakage and to allow the guidewire 10 to pass through. Since blood will flow from the catheter 108 through the proximal end of the catheter 100 when the guidewire 10 is transported through the delivery device 100, a bidirectionally pierceable sealing ring 41 is provided within the guide portion 30 to reduce the amount of bleeding. The guidewire 10 is inserted into the catheter 108 through the slit 411.

[0066] The proximal end piece 106 is provided with an inner cavity extension portion 42 for assembling the catheter 108 at one end thereof facing the conveyor 100 . The inner cavity extension portion 42 extends deep into the conveyor 100 . A locking end cap 107 is provided between the proximal end piece 106 and the catheter 108 . A sealing member 40 is provided in the locking end cap 107 .

[0067] The locking end cap 107 is mounted on the front end of the inner cavity extension 42. A central portion of the locking end cap 107 defines an insertion hole 401, through which the catheter 108 passes. The locking end cap 107 radially positions the catheter 108, preventing radial movement. A seal 40 is disposed between the catheter 108 and the inner cavity extension 42. The seal 40 is used to seal the gap between the proximal inner cavity 20 and the catheter 108, preventing blood leakage.

[0068] According to the proximal structure of the conveyor 100 of the present invention, by providing a guide portion 30 at the proximal end of the catheter 108, the conveyor 100 has the function of replacing the guide wire 10 twice. By providing the guide portion 30, the guide wire 10 can smoothly pass through the proximal inner cavity 20, thereby completing the task of replacing the guide wire 10; secondly, it is ensured that when the guide wire 10 enters the catheter 108, the surface coating will not be scratched by the catheter 108 opening, and the head of the guide wire 10 will not hit the gap between the catheter 108 and the proximal inner cavity 20, thereby ensuring that the guide wire 10 can smoothly penetrate the catheter 108.

[0069] Example 2: Example 2 of this application provides a proximal structure of a conveyor, please refer to Figure 5 and Figure 8 The similarities between Example 2 and Example 1 of the present application are not repeated here. The difference between Example 2 and Example 1 is that the guide portion 30 is a separate component, and the guide portion 30 is connected to the conduit 108 through the connecting end 31, and the connecting end 31 is fixedly connected to the conduit 108 by welding, bonding or clamping.

[0070] The inner side of the connecting end 31 is provided with a snap-fit ​​groove 311, which is snap-fitted to the proximal end of the catheter 108. The snap-fit ​​groove 311 and the catheter 108 can be tightly connected by interference fit, or can be reinforced and fixed by welding or bonding.

[0071] The engaging groove 311 serves as a positioning structure for the guide portion 30 and the conduit 108, thereby achieving higher precision during assembly of the guide portion 30 and the conduit 108. In other embodiments, when welding or bonding is employed, the engaging groove 311 may be omitted, and the guide portion 30 and the conduit 108 may be positioned directly using a machining jig to ensure machining accuracy.

[0072] In this embodiment, after the guide part 30 is engaged and positioned with the catheter 108 through the engaging groove 311, the guide part 30 and the catheter 108 are fixed together by laser welding, and the expanded maximum outer diameter of the guide cavity 32 is seamlessly fitted with the inner wall of the proximal inner cavity 20 without gaps and steps, so that the guide wire 10 can smoothly enter the catheter 108.

[0073] Since the catheter 108 is a long tubular component and is usually made of metal, when the guide portion 30 is integrally formed with the catheter 108, although the proximal end of the catheter 108 can be formed into a flared guide portion 30 through secondary processing, the material requirements for the catheter 108 are high, the processing is difficult, and it is difficult to control the yield rate, so the processing cost is high.

[0074] In this embodiment, the proximal inner cavity 20 may further include a mounting hole 21 and an external assembly hole 23 , and the diameter of the mounting hole 21 is equal to the diameter of the external assembly hole 23 .

[0075] In summary, the guide portion 30 of this embodiment is a separate component, and the guide portion 30 is fixed to the conduit 108 by laser welding, so there is no need to perform secondary processing on the conduit 108. In addition, laser welding has low processing difficulty and low cost, and is suitable for mass production.

[0076] Example 3: Example 3 of the present application provides a proximal structure of a conveyor, such as Figures 8 to 10 As shown, the similarities between Example 3 of the present application and Example 1 are not repeated here. The difference between Example 3 and Example 1 is that the connecting end 31 is detachably connected to the proximal end of the catheter 108, and a guide extension tube 33 is provided between the connecting end 31 and the guide cavity 32.

[0077] In this embodiment, the guide portion 30 is used as a separate accessory. When the doctor needs to replace the guide wire 10, the guide portion 30 is inserted into the proximal lumen 20 through the external assembly hole 23 of the proximal member 106 and detachably connected to the proximal end of the catheter 108 via the connecting end 31 to temporarily assemble the guide wire 10. After the guide wire 10 is replaced, the guide portion 30 is removed from the proximal member 106.

[0078] Since the assembly depths of the catheter 108 of different conveyors 100 are different, in order to adapt to different models of conveyors 100, the present application adds a guide extension tube 33 between the connecting end 31 and the guide cavity 32, thereby increasing the overall length of the guide part 30 so that the guide part 30 can adapt to different models of conveyors 100.

[0079] The third embodiment also differs from the first embodiment in that a sealing ring 41 is disposed between the guide extension tube 33 and the guide cavity 32. Because the sealing ring 41 needs to meet both sealing requirements and bidirectional guidewire 10 passage, the thickness of the central region of the sealing ring 41 is smaller than that of the peripheral region. By reducing the thickness of the central region of the sealing ring 41, the frictional force of the guidewire 10 passing through the sealing ring 41 is reduced, making it easier for the guidewire 10 to pass through the sealing ring 41.

[0080] The slits 411 of the sealing ring 41 include a straight slit 411, a cross slit 411, and a 'M' slit 411. The present embodiment uses the cross slit 411, which ensures sealing performance and facilitates the insertion of the guide wire 10.

[0081] like Figure 10 As shown, the guide portion 30 further includes a puncture guide 35 for expanding the sealing ring 41 .

[0082] For implantation of the internal iliac stent, the guidewire 10 needs to be bent, so it is provided with a soft tip 11. Under normal circumstances, the soft tip 11 of the guidewire 10 enters the human body through the catheter 108. The proximal end of the guidewire 10 enters the conveyor 100 through the tip 101 of the conveyor 100 and then exits through the proximal end piece 106 of the conveyor 100. Once the guidewire 10 enters the proximal lumen 20 through the catheter 108, the proximal end of the guidewire 10 is hard and can be directly passed through the slit 411 in the middle of the sealing ring 41 to exit the proximal end piece 106, thus completing the withdrawal of the guidewire 10.

[0083] However, when the doctor needs to replace the guide wire 10 a second time, the soft tip 11 of the guide wire 10 has limited hardness and is difficult to pass smoothly through the sealing ring 41. Therefore, this embodiment provides a puncture guide 35 for expanding the sealing ring 41. The puncture guide 35 is a hollow tubular component. The diameter of the front end of the puncture guide 35 is smaller than the diameter of the proximal end of the puncture guide 35. The front end of the puncture guide 35 is provided with a tapered puncture head.

[0084] In this embodiment, the sealing ring 41 is expanded through the puncture introducer 35, and then the guidewire 10 is inserted into the puncture introducer 35. The guidewire 10 passes through the puncture introducer 35 and enters the proximal lumen 20. The guidewire 10 then enters the human body lumen via the catheter 108 and the tip 101, completing the secondary replacement of the guidewire 10. This method allows the doctor to complete the secondary replacement of the guidewire 10 through the proximal end 106 without removing the delivery device 100 from the human body lumen, effectively reducing bleeding.

[0085] Example 4: Example 4 of the present application provides a proximal structure of a conveyor, such as Figures 11 to 13As shown, the similarities between Example 4 and Example 1 of the present application are not repeated here. The difference between Example 4 and Example 1 is that the guide portion 30 includes a guide cavity 32 disposed at the proximal end of the catheter 108. In this embodiment, the guide cavity 32 is a tapered guide opening 34 integrally formed at the proximal end of the catheter 108, and the tapered guide opening 34 is formed by cutting. A stepped surface 211 is provided at the end where the mounting hole 21 connects to the guide hole 22. The cross-sectional area of ​​the end where the guide hole 22 connects to the mounting hole 21 is smaller than the cross-sectional area of ​​the end where the guide hole 22 connects to the external assembly hole 23.

[0086] A stepped surface 211 is provided between the mounting hole 21 and the guide hole 22 in the proximal lumen 20. Stepped surface 211 is used to limit the axial displacement of the catheter 108. When the catheter 108 is inserted into the bottom of the mounting hole 21, the catheter 108 abuts against the stepped surface 211. The outer diameter of the catheter 108 is equal to the inner diameter of the mounting hole 21, or the gap between the catheter 108 and the mounting hole 21 is less than 1 mm.

[0087] Guide hole 22 and tapered guide opening 34 both serve as guides. The length of guide hole 22 is at least greater than that of external assembly hole 23. This greater length in this embodiment reduces the angle of inclination of the inner wall of guide hole 22, allowing guidewire 10 to pass more smoothly into proximal lumen 20. Furthermore, the tapered guide opening 34 at the conduit 108 eliminates steps and transitions in the conduit wall, preventing the conduit 108 from scratching the coating on the guidewire 10 surface.

[0088] like Figure 14 As shown, under normal circumstances, the catheter 108 is assembled to the bottom of the mounting hole 21. Since the catheter 108 is directly docked with the guide hole 22, the guide wire 10 can directly enter the catheter 108 through the guide hole 22, thereby completing the function of replacing the guide wire 10.

[0089] like Figure 15 As shown, due to length tolerances during the manufacture of catheter 108, catheter 108 may not fit into the bottom of mounting hole 21 during installation. In this situation, a gap exists between catheter 108 and the bottom of mounting hole 21. After passing through guide hole 22 of proximal member 106, guidewire 10 must still move a distance along the inner wall of mounting hole 21. Because catheter 108 utilizes a tapered guide opening 34, guidewire 10 can still smoothly pass through mounting hole 21 and into catheter 108, completing the function of replacing guidewire 10.

[0090] The application adopts the above technical solution, so that the conveyor 100 has the function of replacing the guide wire 10 twice. By setting the guide part 30, the gap between the catheter 108 and the proximal inner cavity 20 is eliminated, so that the guide wire 10 can smoothly pass through the proximal inner cavity 20 and complete the task of replacing the guide wire 10. Secondly, it ensures that when the guide wire 10 enters the catheter 108, the surface coating will not be scratched by the catheter 108 mouth, and the head of the guide wire 10 will not hit the gap between the catheter 108 and the proximal inner cavity 20, ensuring that the guide wire 10 can smoothly penetrate the catheter 108. In addition, by setting a sealing ring 41 in the guide part 30, it ensures that when the guide wire 10 enters and exits the conveyor 100, blood is prevented from flowing out of the catheter 108 through the proximal end of the conveyor 100. When the guide wire 10 is replaced for the second time, the amount of blood outflow is reduced, reducing the risk of surgery.

[0091] Example 5: Example 5 of the present application provides a proximal structure of a conveyor, such as Figure 16 As shown, the similarities between Example 5 and Example 4 of the present application are not repeated. The difference between Example 5 and Example 4 is that an abutment portion 212 is provided at the other end of the mounting hole 21 away from the guide hole 22, and a rebound component 213 is provided between the abutment portion 212 and the guide portion 30. The rebound component 213 is used to drive the guide portion 30 to fit onto the step surface 211.

[0092] In this embodiment, the abutment portion 212 is integrally formed with the inner wall of the mounting hole 21. The abutment portion 212 protrudes from the inner wall of the mounting hole 21 and forms an abutment surface for supporting the resilient member 213. The resilient member 213 is disposed in the cavity between the abutment portion 212 and the guide portion 30. The resilient member 213 can be any component with resilient properties, such as a spring, an elastic rubber pad, etc.

[0093] In this embodiment, a rebound component 213 is provided between the abutment portion 212 and the guide portion 30, and the elastic force of the rebound component 213 drives the guide portion 30 to fit against the step surface 211, thereby eliminating the gap between the guide portion 30 and the step surface 211 that may exist due to assembly tolerance, so that the guide wire 10 will not be stuck in the gap between the guide portion 30 and the step surface 211 when inserting, further facilitating the guide wire 10 to penetrate into the catheter 108.

[0094] Example 6: Example 6 of the present application provides a proximal structure of a conveyor, such as Figure 17 and Figure 18As shown, the similarities between Example 6 of the present application and Example 1 are no longer repeated. The difference between Example 6 and Example 1 is that an auxiliary wire threading assembly 50 is provided on the proximal part 106, and the auxiliary wire threading assembly 50 is connected to the interior of the proximal inner cavity 20. The auxiliary wire threading assembly 50 includes a driving wheel 51 rotatably connected to the proximal part 106, a pressure wheel 52 and a driving member for driving the driving wheel 51 to rotate, and a gap is formed between the driving wheel 51 and the pressure wheel 52 for the guide wire 10 to pass through.

[0095] The auxiliary wire threading assembly 50 is arranged on the proximal side relative to the catheter 108. The auxiliary wire threading assembly 50 includes a driving wheel 51 and at least one pressure wheel 52. The driving wheel 51 and the pressure wheel 52 are respectively rotatably connected to the interior of the proximal member 106. A gap is reserved between the driving wheel 51 and the pressure wheel 52 for the guide wire 10 to pass through. The pressure wheel 52 is a driven wheel. When the guide wire 10 passes through the proximal inner cavity 20, it first passes through the gap between the driving wheel 51 and the pressure wheel 52. The driving wheel 51 and the pressure wheel 52 clamp the guide wire 10 in the gap from two directions.

[0096] The driving member is disposed outside the proximal member 106. In this embodiment, the driving member is a handwheel 53 rotatably connected to the proximal member 106 and axially connected to the driving wheel 51, or another power source capable of driving the driving wheel 51. The doctor can rotate the handwheel 53 to drive the driving wheel 51, which then drives the guidewire 10 forward and backward through friction, thereby fine-tuning the position of the guidewire 10.

[0097] In this embodiment, the surfaces of the driving wheel 51 and the pressure wheel 52 have an elastic structure, or the driving wheel 51 and the pressure wheel 52 are made of an elastic material, such as rubber. Therefore, the contact surface between the driving wheel 51 and the pressure wheel 52 and the guide wire 10 is a soft connection, thereby protecting the guide wire 10 and preventing the guide wire 10 from being damaged by squeezing.

[0098] In addition, the width of the gap is less than or equal to the diameter of the guidewire 10. When the width of the gap is less than the diameter of the guidewire 10, the ratio of the width of the gap to the diameter of the guidewire 10 is greater than 0.9 and less than 1.

[0099] A locking assembly 54 is also provided between the handwheel 53 and the proximal member 106. This locking assembly 54 comprises a fixed locking hole 541 provided on the proximal member 106, several movable locking holes provided on the handwheel 53, and a latch 542 for sequentially inserting into the movable locking holes and the fixed locking hole 541. Due to the perspective of the accompanying drawings, the movable locking holes are not visible. The movable locking holes are evenly distributed circumferentially on the handwheel 53 and extend axially through the handwheel 53. Each movable locking hole is capable of being aligned with the fixed locking hole 541. In this embodiment, the handwheel 53 is provided with eight evenly distributed movable locking holes.

[0100] When the latch 542 is withdrawn from the locking hole 541, the driving wheel 51 and the handwheel 53 are in a free-rotating state. Therefore, the guidewire 10 can be actively moved and, by rotating the driving wheel 51 and the pressure wheel 52, pass through the proximal lumen 20 and then be inserted into the catheter 108. Alternatively, the handwheel 53 can drive the driving wheel 51 to rotate, thereby driving the guidewire 10 to move, allowing the guidewire 10 to pass through the proximal lumen 20 and then be inserted into the catheter 108.

[0101] When the latch 542 is inserted into the fixed locking hole 541 through the movable locking hole, the handwheel 53 cannot rotate relative to the proximal part 106, and the driving wheel 51 remains stationary relative to the proximal part 106. Due to the friction between the guide wire 10 and the driving wheel 51, the guide wire 10 cannot move relative to the proximal part 106, thereby achieving the positioning of the guide wire 10.

[0102] In other embodiments, the hand wheel 53 may be provided with a scale mark to display the distance the guide wire 10 moves when the hand wheel 53 is rotated, thereby providing convenience for the doctor to fine-tune the position of the guide wire 10.

[0103] As described above, this embodiment increases the function of the proximal part 106 by providing the auxiliary wire threading assembly 50 on the proximal part 106, achieves the purpose of fine-tuning the position of the guide wire 10, and achieves the purpose of positioning the guide wire 10 through the locking assembly 54.

[0104] The present application also provides a delivery system, specifically Figure 1 As shown, the delivery system includes a delivery device 100 and a guide wire 10. The delivery device 100 includes the proximal structure of the delivery device 100 as described above, a sheath tube 102 is provided at the front end of the delivery device 100, a sheath core (not shown in the figure) is provided in the sheath tube 102, a TIP head 101 is provided at the front end of the sheath core, and the guide wire 10 is inserted into the cavity in the sheath core.

[0105] The catheter 108 is connected to the sheath tube 102 via a connector body 109. The conveyor 100 is provided with a drive mechanism (not shown) for driving the sheath tube 102 relative to the sheath core. The drive mechanism includes a fixed push rod connector 105 fixedly connected to the catheter 108 and a pulley assembly (not shown). The conveyor 100 includes an outer shell 111, to which the fixed push rod connector 105 is slidably connected.

[0106] The proximal member 106 is mounted at the rear end of the outer housing 111, and the catheter 108 is inserted into the proximal member 106 through the locking end cap 107. A protective sleeve 112 is provided at the front end of the outer housing 111, through which the sheath 102 passes and into the outer housing 111. The catheter 108 is mounted within the outer housing 111, and the sheath 102 is fixedly connected to the connector body 109. The catheter 108 passes through the connector body 109 and is inserted into the sheath 102, communicating with the inner lumen of the sheath 102.

[0107] The outer shell 111 is provided with a chute (not shown) extending along the length of the conveyor 100. A connector gland 110 is provided on the connector body 109. One end of the connector gland 110 is fixed to the connector body 109, and the other end of the connector gland 110 is slidably connected to the chute. During operation, the sheath tube 102 is moved by pushing the connector gland 110.

[0108] The outer shell 111 is provided with a snap 104 and a locking key 103. A snap (not shown) is provided on the connector body 109. One end of the snap 104 is fixedly connected to the outer shell 111, and the other end of the snap 104 is engaged with the snap. The locking key 103 is slidably connected to the outer shell 111 and is used to drive the snap to engage or disengage with the snap 104. When the snap engages with the snap 104, the connector body 109 is fixed relative to the outer shell 111. When the snap is disengaged from the snap 104, the connector body 109 can move relative to the outer shell 111.

[0109] When implanting a stent, the guidewire 10 is first inserted into the human lumen, an entry path is established through the guidewire 10, and then the sheath 102 is moved along the entry path established by the guidewire 10 to a predetermined position, with the stent positioned between the sheath core and the sheath 102. When the stent is delivered to the predetermined position along with the sheath 102, the doctor unlocks the connector body 109 with the lock key 103, and then pushes the connector gland 110 to withdraw the sheath 102. The stent between the sheath 102 and the sheath core gradually expands at the predetermined position as the sheath 102 withdraws. The stent is fixed at the predetermined position by the radial support force of the stent itself and the contraction force of the human lumen itself.

[0110] In summary, the conveying system of the present application has the function of quickly replacing the guide wire 10 by setting the proximal part 106 at the proximal end of the conveyor 100, which meets the doctor's need to replace the guide wire 10 under special circumstances and reduces the operation time and bleeding.

[0111] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A proximal end structure of a conveyor, comprising a proximal end member disposed at the proximal end of the conveyor and a catheter connected to the proximal end member, characterized in that: A proximal inner cavity is provided in the proximal end piece, the proximal end of the catheter is provided in the proximal inner cavity, and the proximal end of the catheter is provided with a guide part for guiding the guide wire to penetrate into the catheter; the guide part includes a connecting end connected to the catheter and a flared guide cavity for accommodating the guide wire, the cross-sectional area of ​​the guide cavity away from the catheter is larger than the cross-sectional area of ​​the guide cavity close to the catheter; the connecting end is detachably connected to the proximal end of the catheter, and a guide extension tube is provided between the connecting end and the guide cavity, so that the guide part is used as a separate accessory, and temporary replacement of the guide wire is achieved through temporary assembly of the connecting end and the proximal end of the catheter that is detachable; a sealing ring is provided between the connecting end and the guide cavity, and a slit is provided in the middle of the sealing ring for preventing liquid leakage and for allowing the guide wire to pass through, and the guide part also includes a puncture guide for expanding the sealing ring.

2. A proximal end structure of a conveyor, comprising a proximal end member disposed at the proximal end of the conveyor and a catheter connected to the proximal end member, characterized in that: A proximal inner cavity is provided in the proximal end piece, the proximal end of the catheter is provided in the proximal inner cavity, and the proximal end portion of the catheter is provided with a guide portion for guiding the guide wire to penetrate into the catheter; the proximal inner cavity runs through the proximal end piece, and the proximal inner cavity sequentially includes a mounting hole for accommodating the catheter, a guide hole for guiding the guide wire and an external assembly hole for connecting an external element, and the guide portion includes a guide cavity provided at the proximal end of the catheter; the guide wire can directly enter the catheter through the guide hole, thereby completing the temporary replacement of the guide wire; the end of the mounting hole connected to the guide hole is provided with a step surface, and the cross-sectional area of ​​the end of the guide hole connected to the mounting hole is smaller than the cross-sectional area of ​​the end of the guide hole connected to the external assembly hole; the other end of the mounting hole away from the guide hole is provided with an abutment portion, and a rebound component is provided between the abutment portion and the guide portion, and the rebound component is used to drive the guide portion to fit the step surface.

3. The proximal end structure of the conveyor according to claim 2, characterized in that: The guide portion includes a tapered guide opening, and the length of the guide hole is greater than the length of the external assembly hole.

4. The proximal end structure of the conveyor according to claim 1 or 2, characterized in that: A locking end cap is provided between the proximal end member and the catheter, and a sealing member is provided inside the locking end cap. The sealing member is used to seal the gap between the proximal end inner cavity and the catheter.

5. The proximal end structure of the conveyor according to claim 4, characterized in that: An inner cavity extension portion is provided at one end of the proximal part facing the conveyor, the locking end cap is provided at the front end of the inner cavity extension portion, and the sealing member is provided between the catheter and the inner cavity extension portion.

6. The proximal end structure of the conveyor according to claim 1 or 2, characterized in that: The proximal part is provided with an auxiliary wire threading assembly connected to the proximal inner cavity. The auxiliary wire threading assembly includes a driving wheel rotatably connected to the proximal part and a driving member for driving the driving wheel to rotate.

7. The proximal end structure of the conveyor according to claim 6, characterized in that: The auxiliary wire threading assembly further comprises a pressure wheel rotatably connected to the proximal end member, and a gap for the guide wire to pass through is formed between the driving wheel and the pressure wheel.

8. A conveying system, characterized in that: It comprises the proximal end structure of the conveyor according to any one of claims 1 to 7, wherein the front end of the conveyor is provided with a sheath, and the catheter is connected to the sheath through a joint body.

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