Conveying device and medical system

Abstract

The invention provides a conveying device and a medical system. The conveying device comprises a handle, a stabilizing tube and a loading and releasing tube machine driving part. The stabilizing tube is connected to the far end of the handle; the near end of the loading and releasing tube penetrates through the stabilizing tube and extends into the handle, the loading and releasing tube comprises an inner tube and an outer tube, and the near end of the inner tube is connected with the handle; the outer pipe sleeves a part of the outer peripheral surface of the inner pipe; the driving part is arranged on the handle, connected with the near end of the outer tube and used for driving the outer tube to generate axial movement relative to the inner tube and the stabilizing tube. When the conveying device is used for conveying and releasing the stent, the positioning accuracy of the stent can be improved, and the form of the released stent is improved.

Description

[0001] This application is a divisional application of the application with the application number 202210621920.X, the application date of June 1, 2022, and the invention title of "A Delivery Device and a Medical System". Technical Field

[0002] The present invention relates to the technical field of medical devices, and particularly relates to a delivery device and a medical system. Background Art

[0003] Currently, there are various medical devices available in the market for endovascular treatment. These devices include stents, volume reduction, and thrombectomy, etc. Among them, the stent, as one of the methods of endovascular treatment, has a very wide range of applications. During the application process of the stent, it needs to be delivered through a delivery device and released in the diseased area within the blood vessel.

[0004] The delivery device for the stent generally includes a handle assembly and a tube assembly. The tube assembly at least includes an inner tube and an outer tube. The stent is loaded between the inner tube and the outer tube. The handle assembly includes a housing suitable for holding and a driving part. The driving part is used to control the axial relative movement between the outer tube and the inner tube to release the stent. During the operation, the operator constructs a passage using a guide wire, sleeving the inner tube on the guide wire so that the distal end of the delivery device can reach the diseased site along the guide wire. Then, the stent is positioned, and finally, the driving part is manipulated to drive the axial relative movement between the inner tube and the outer tube to complete the release of the stent. During the stent release process, it is necessary to maintain the movement stability of the outer tube and / or the inner tube to ensure that the stent can be accurately positioned when released and maintain a good shape after the stent is released. However, when the existing delivery device drives the inner tube and / or the outer tube to move, it often causes the inner tube or the outer tube to be straightened due to the force, resulting in inaccurate stent positioning and the situation that the distal end of the stent accumulates, leading to a poor shape of the stent after release. Summary of the Invention

[0005] The purpose of the present invention is to provide a delivery device and a medical system, aiming to improve the positioning accuracy during the stent release process and improve the shape of the stent after release.

[0006] To achieve the above purpose, the present invention provides a delivery device, including:

[0007] A handle;

[0008] A stabilizing tube, connected to the distal end of the handle;

[0009] A loading and releasing tube, the proximal end of the loading and releasing tube passes through the stabilizing tube and extends into the interior of the handle. The loading and releasing tube includes an inner tube and an outer tube. The proximal end of the inner tube is connected to the handle, and the outer tube is sleeved on a part of the outer peripheral surface of the inner tube; and,

[0010] A driving part is arranged on the handle and connected to the proximal end of the outer tube, and is used to drive the outer tube to axially move relative to the inner tube and the stabilizing tube.

[0011] Optionally, the inner tube includes a first loading section and an ejecting part arranged on the proximal side of the first loading section, and the outer diameter of the ejecting part is larger than that of the first loading section; the outer tube includes a second loading section and a non-loading section arranged on the proximal side of the second loading section, the outer diameter of the second loading section is larger than that of the non-loading section, and the second loading section is used to axially coincide with the first loading section at least partially, so that a loading space is formed between the inner peripheral surface of the second loading section and the outer peripheral surface of the first loading section.

[0012] Optionally, the outer diameter of the second loading section is 116% - 117% of the outer diameter of the non-loading section; and / or, the outer diameter of the stabilizing tube is 100% - 110% of the outer diameter of the second loading section.

[0013] Optionally, the inner tube includes an inner tube body and a push tube, the inner tube body includes the first loading section, the push tube is sleeved on the inner tube body and located on the proximal side of the first loading section, so that the push tube constitutes the ejecting part; the proximal end of the inner tube body and the proximal end of the push tube are both connected to the handle.

[0014] Optionally, the handle includes a housing; the driving part includes a first roller, a second roller, a sliding part and a wire, the first roller and the second roller are rotatably arranged on the housing, the sliding part is movably arranged on the housing and connected to the outer tube, one end of the wire is connected to the sliding part, the other end of the wire bypasses the second roller and is also wound around the first roller;

[0015] When the first roller rotates in a predetermined direction, the first roller applies a pulling force from the distal end to the proximal end to the sliding part through the wire, so as to drive the sliding part to move on the housing in the direction from the distal end to the proximal end, and further drive the outer tube to move in the direction from the distal end to the proximal end.

[0016] Optionally, the second roller is located on the proximal side of the first roller, and the other end of the wire bypasses the second roller and is folded back and wound around the first roller.

[0017] Optionally, the first roller is partially arranged inside the housing, the second roller, the sliding part and the wire are all arranged inside the housing; the conveying device further includes a guiding mechanism, the guiding mechanism is arranged inside the housing and extends in the direction from the distal end to the proximal end, the sliding part is arranged on the guiding mechanism and is used to move along the guiding mechanism.

[0018] Optionally, a guiding groove extending from the distal end to the proximal end is further provided on the housing. The driving part further includes a first operating part which is connected to the sliding part and partially passes through the guiding groove and extends to the outside of the housing.

[0019] Optionally, the handle further includes a stress diffusion tube connected to the distal end of the housing. The stress diffusion tube is sleeved on the proximal end of the stabilizing tube and remains relatively stationary with respect to the stabilizing tube. The conveying device further includes a baffle and a guide rod. The baffle is arranged inside the housing, and a sliding groove extending from the distal end to the proximal end is provided on the baffle. The distal end of the guide rod is connected to the stress diffusion tube, and the proximal end of the guide rod is connected to the proximal end of the housing. The guide rod and the sliding groove constitute the guiding mechanism. The sliding part includes a first connection hole and is sleeved on the guide rod through the first connection hole, and the sliding part is also partially arranged in the sliding groove.

[0020] Optionally, the baffle includes a baffle body and convex ribs. The number of the convex ribs is two, and both convex ribs extend from the distal end to the proximal end. The two convex ribs are spaced apart in a direction perpendicular to the guide rod, and the space between the two convex ribs constitutes the sliding groove.

[0021] Optionally, a plurality of notches arranged in sequence from the distal end to the proximal end are formed on the convex rib for disengaging from the sliding part.

[0022] Optionally, the handle includes a housing and a stress diffusion tube. The stress diffusion tube is connected to the distal end of the housing, sleeved on the outer peripheral surface of the proximal end of the stabilizing tube and remains relatively stationary with respect to the stabilizing tube. A second connection hole is provided on the stress diffusion tube, which extends axially through and includes a proximal hole section and a distal hole section connected axially. The inner diameter of the proximal hole section is larger than that of the distal hole section, and a first circumferential limiting member is further provided on the inner wall of the proximal hole section.

[0023] The stabilizing tube includes a stabilizing tube body and a stabilizing tube connecting piece arranged at the proximal end of the stabilizing tube body. A second circumferential limiting member is provided on the outer peripheral surface of the stabilizing tube body. The proximal end of the stabilizing tube body is inserted into the distal hole section of the second connection hole, and the stabilizing tube connecting piece is arranged in the proximal hole section of the second connection hole, and the second circumferential limiting member is connected in cooperation with the first circumferential limiting member.

[0024] Optionally, the conveying device further includes a one-way control mechanism for preventing the first roller from rotating in the reverse direction of the predetermined direction.

[0025] Optionally, the one-way control mechanism includes a check wheel and a pawl. The check wheel is disposed on the housing, located inside the housing, and remains relatively stationary with respect to the housing. The check wheel is provided with ratchet teeth. The pawl is connected to the first roller, and the pawl is used to selectively engage or disengage with the ratchet teeth. When the pawl engages with the ratchet teeth, it prevents the first roller from rotating in the reverse direction of the predetermined direction. When the pawl disengages from the ratchet teeth, it allows the first roller to rotate in the predetermined direction.

[0026] Optionally, the conveying device further includes a limiting portion, and the limiting portion selectively connects or disconnects from the sliding portion. When the limiting portion is connected to the sliding portion, the sliding portion remains relatively stationary with respect to the housing to prevent the driving portion from driving the outer tube to move relative to the inner tube and the stabilizing tube. When the sliding portion disconnects from the housing, it allows the sliding portion to slide on the housing to allow the driving portion to drive the outer tube to move relative to the inner tube and the stabilizing tube.

[0027] Optionally, the sliding portion is disposed inside the housing. The housing is provided with an avoidance groove, and the sliding portion is provided with a first card slot. The limiting portion includes a second operating portion and a clamping block connected to each other. The second operating portion is disposed outside the housing, and the clamping block is used to pass through the avoidance groove and insert into the first card slot.

[0028] Optionally, the sliding portion is provided with a fourth connection hole, and a third circumferential limiting member is provided on the hole wall of the fourth connection hole. Two second card slots are further provided on the outer wall of the sliding portion, and the two second card slots are symmetrically arranged in the circumferential direction of the fourth connection hole.

[0029] The outer tube includes an outer tube body and an outer tube connecting member disposed on the outer tube body. The outer tube connecting member includes a sleeve and a clamping claw. A fourth circumferential limiting member is provided on the outer circumferential surface of the sleeve, and the clamping claw is connected to the sleeve. The sleeve is inserted into the fourth connection hole, and the fourth circumferential limiting member is connected in cooperation with the third circumferential limiting member. One clamping claw is inserted into one of the second card slots.

[0030] To achieve the above object, the present invention further provides a medical system, including a medical implant and the conveying device as described in any one of the preceding items. The medical implant is used to be loaded between the inner tube and the outer tube.

[0031] Compared with the prior art, the conveying device and the medical system of the present invention have the following advantages:

[0032] The foregoing delivery device includes a handle, a stabilizing tube, a loading and releasing tube, and a driving part; wherein, the stabilizing tube is connected to the distal end of the handle; the proximal end of the loading and releasing tube passes through the stabilizing tube and extends into the interior of the handle, the loading and releasing tube includes an inner tube and an outer tube, the proximal end of the inner tube is connected to the handle; the outer tube is sleeved on a partial outer peripheral surface of the inner tube; the driving part is arranged on the handle and is connected to the proximal end of the outer tube for driving the outer tube to generate an axial movement relative to the inner tube and the stabilizing tube. A loading space is formed between a partial outer peripheral surface of the inner tube and a partial inner peripheral surface of the outer tube for loading a medical implant, so that the delivery device can be used to deliver and release the medical implant, and the medical implant is, for example, a stent, and the stent is loaded in the loading space. When the medical stent reaches the diseased position of the blood vessel, the driving part is used to drive the outer tube to move from the distal end to the proximal end relative to the inner tube and the stabilizing tube to achieve the purpose of releasing the stent. By arranging the stabilizing tube and using the stabilizing tube to provide a stable movement channel for the outer tube, the delivery device can prevent the outer tube from being straightened during the movement from the distal end to the proximal end, so that the outer tube can maintain good coaxiality with the blood vessel, and further avoid the situation that the inner tube is straightened together with the outer tube, resulting in the displacement of the stent during release or the accumulation of the distal end of the stent.

[0033] Further, the inner tube includes a first loading section and an ejecting part arranged on the proximal side of the first loading section, the outer diameter of the ejecting part is larger than the outer diameter of the first loading section, and the outer tube includes a second loading section and a non-loading section arranged on the proximal side of the second loading section, the outer diameter of the second loading section is larger than the outer diameter of the non-loading section, and the second loading section and the first loading section at least partially coincide axially so that a loading space is formed between the inner peripheral surface of the second loading section and the outer peripheral surface of the first loading section. With such a configuration, the outer diameter of the stabilizing tube can be equal to or slightly larger than the outer diameter of the second loading section of the outer tube, so that the outer diameter of the stabilizing tube will not be too large, which is beneficial to using a delivery sheath with a smaller radial dimension, such as a 6F delivery sheath, to construct the overall delivery channel, making it easier for the introduction part of the delivery device (that is, the part introduced into the patient's body, specifically including partial structures of the inner tube, partial structures of the outer tube, and at least partial structures of the stabilizing tube) to enter the patient's body. Description of the Drawings

[0034] The drawings are used to better understand the present invention and do not constitute an improper limitation to the present invention. Among them:

[0035] Figure 1 is a schematic structural diagram of the delivery device provided by the present invention according to an embodiment;

[0036] Figure 2 is a partial structural schematic diagram of a conveying device provided according to an embodiment of the present invention;

[0037] Figure 3 is a partial structural schematic diagram of a conveying device provided according to an embodiment of the present invention, Figure 3 which is different from the part shown in Figure 2 ;

[0038] Figure 4 is Figure 3 a cross-sectional view of the conveying device shown at A;

[0039] Figure 5 is a partial structural schematic diagram of a conveying device provided according to an embodiment of the present invention, in which a part of the housing is removed, and the connection manner between the inner tube and the housing is mainly shown;

[0040] Figure 6 is a partial structural schematic diagram of a conveying device provided according to an embodiment of the present invention, in which a part of the housing is removed, and the proximal part of the inner tube is mainly shown, and the proximal section of the push tube is shown by a dotted line;

[0041] Figure 7 is a partial structural schematic diagram of a conveying device provided according to an embodiment of the present invention, in which a part of the housing of the handle is removed;

[0042] Figure 8 is Figure 7 a B-B cross-sectional view of the conveying device shown;

[0043] Figure 9 is Figure 7 a C-C cross-sectional view of the conveying device shown;

[0044] Figure 10 is a partial structural schematic diagram of a conveying device provided according to an embodiment of the present invention, in which the stabilizing tube and the loading and releasing tube are not shown;

[0045] Figure 11 is a partial structural schematic diagram of a conveying device provided according to an embodiment of the present invention, in which a part of the housing is removed;

[0046] Figure 12 is a partial structural schematic diagram of a conveying device provided according to an embodiment of the present invention, in which the connection manner between the stabilizing tube and the stress diffusion tube is mainly shown;

[0047] Figure 13 is a partial structural schematic diagram of the handle of a conveying device provided according to an embodiment of the present invention, in which a part of the housing is removed, and the relationship between the second roller and the wire rope is mainly shown;

[0048] Figure 14FIG. 0 is a partial structural schematic diagram of a conveying device according to an embodiment of the present invention, mainly showing the connection manner between the outer tube and the sliding part in the figure;

[0049] Figure 15 FIG. 4 is a partial structural schematic diagram of a conveying device according to an embodiment of the present invention, showing the positional relationship among the limiting part, the housing, the baffle, the guide rod, the sliding part and the wire rope in the figure;

[0050] Figure 16 FIG. 8 is a structural schematic diagram of the handle of a conveying device according to an embodiment of the present invention. A part of the housing is removed in the figure, and the guide rod is completely shown;

[0051] Figure 17 FIG. 12 is a structural schematic diagram of the baffle of a conveying device according to an embodiment of the present invention;

[0052] Figure 18 FIG. 16 is a partial structural schematic diagram of a conveying device according to an embodiment of the present invention, mainly showing the one-way control mechanism in the figure;

[0053] Figure 19 FIG. 20 is a partial structural schematic diagram of a conveying device according to an embodiment of the present invention, showing the positional relationship between the limiting part and the baffle and the sliding part in the figure.

[0054] [Explanation of reference numerals is as follows]:

[0055] 1000 - Handle, 1100 - Housing, 1110 - Guide groove, 1120 - Avoidance groove, 1200 - Stress diffusion tube, 1210 - Second connection hole, 1211 - Proximal hole section, 1212 - Distal hole section, 1213 - First circumferential limiting member, 1220 - Third connection hole, 2000 - Stabilizing tube, 2100 - Stabilizing tube body, 2200 - Stabilizing tube connector, 2210 - Second circumferential limiting member, 3000 - Loading and releasing tube, 3100 - Inner tube, 3101 - First loading section, 3110 - Inner tube body, 3120 - Pushing tube, 3121 - Pushing head, 3122 - Proximal section, 3123 - Distal section, 3130 - Inner tube connector, 3200 - Outer tube, 3201 - Second loading section, 3202 - Non-loading section, 3210 - Outer tube body, 3220 - Outer tube connector, 3221 - Sleeve, 3222 - Claw, 4000 - Driving part, 4100 - First roller, 4200 - Second roller, 4300 - Sliding part, 4310 - Fourth connection hole, 4311 - Third circumferential limiting member, 3223 - Fourth circumferential limiting member, 4320 - Second clamping groove, 4330 - First wire threading hole, 4340 - Second wire threading hole, 4350 - First connection hole, 4360 - First clamping groove, 4400 - Pulling wire, 4500 - First operating part, 5100 - Guide rod, 5200 - Baffle, 5210 - Slide groove, 5220 - Baffle body, 5230 - Ridge, 5231 - Notch, 5240 - Blocking part, 6100 - Check wheel, 6110 - Ratchet teeth, 6200 - Pawl, 6300 - Central axis, 7000 - Limiting part, 7100 - Second operating part, 7200 - Clamping block, 8000 - Guide head;

[0056] 10 - Bracket. Detailed implementation mode

[0057] The following uses specific specific examples to illustrate the implementation mode of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through different specific implementation modes. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in this embodiment only illustrate the basic concept of the present invention in a schematic manner. Therefore, only the components related to the present invention are shown in the drawings, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and ratio of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0058] In addition, each of the embodiments described below has one or more technical features. However, this does not mean that the inventor must implement all the technical features in any one embodiment simultaneously, or can only separately implement some or all of the technical features in different embodiments. In other words, on the premise that implementation is possible, those skilled in the art can, according to the disclosure of the present invention and in view of design specifications or implementation requirements, selectively implement some or all of the technical features in any one embodiment, or selectively implement a combination of some or all of the technical features in multiple embodiments, thereby increasing the flexibility during the implementation of the present invention.

[0059] As used in this specification, the singular forms "a", "an", and "the" include plural referents, and the plural form "plural" includes more than two referents, unless the context clearly indicates otherwise. As used in this specification, the term "or" is generally used in the sense of including "and / or", unless the context clearly indicates otherwise, and the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] In addition, in this article, the terms "proximal end" and "distal end" are the relative orientations, relative positions, and directions of elements or actions relative to each other from the perspective of a doctor using the medical device. Although "proximal end" and "distal end" are not restrictive, generally, the "proximal end" refers to the end of the medical device that is close to the doctor during normal operation, and the "distal end" generally refers to the end that first enters the patient's body.

[0061] To make the objectives, advantages, and features of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. It should be noted that the drawings are all in very simplified forms and use non-precise scales, only for the purpose of facilitating and clearly assisting in explaining the objectives of the embodiments of the present invention. The same or similar reference numerals in the drawings represent the same or similar components.

[0062] Figure 1 The structural schematic diagram of the delivery device provided by the embodiment of the present invention is shown, Figure 2 and Figure 3 The schematic diagram of different regions of the delivery device is shown, Figure 4 is Figure 3 The enlarged schematic diagram at position A in Figures 1 to 4 As shown, the delivery device includes a handle 1000, a stabilizing tube 2000, a loading and releasing tube 3000, and a driving part 4000 (Figures 1 to 4 Not marked in, please refer to Figure 11 (as marked in). Among them, the stable tube 2000 is connected to the distal end of the handle 1000. The proximal end of the loading and releasing tube 3000 passes through the stable tube 2000 and extends into the interior of the handle 1000. The loading and releasing tube 3000 includes an inner tube 3100 and an outer tube 3200. The proximal end of the inner tube 3100 is connected to the handle 1000. The outer tube 3200 is sleeved on a part of the outer peripheral surface of the inner tube 3100. The driving part 4000 is arranged on the handle 1000 and is connected to the proximal end of the outer tube 3200. The driving part 4000 is used to drive the outer tube 3200 to generate an axial movement relative to the inner tube 3100 and the stable tube 2000.

[0063] Preferably, the inner tube 3100 includes a first loading section 3101 and an ejecting part (not marked in the figure). The ejecting part is arranged on the proximal side of the first loading section 3101, and the outer diameter of the ejecting part is larger than the outer diameter of the first loading section 3101. A part of the structure of the outer tube 3200 is axially coincident with the first loading section 3101, so as to form a loading space between the inner peripheral surface of the outer tube 3200 and the outer peripheral surface of the first loading section 3101.

[0064] The conveying device is used to load a medical implant and convey and release the medical implant at a diseased position in a blood vessel. The medical implant includes but is not limited to a stent 10 (such as Figure 2 shown). In this article, the medical implant is taken as the stent 10 as an example for illustration. In addition, in the embodiment of the present invention, the inner tube 3100 and the stable tube 2000 remain relatively stationary relative to the handle 1000 during use, and the outer tube 3200 can move axially relative to the handle 1000, so that the outer tube 3200 can move axially relative to the inner tube 3100 and the stable tube 2000. Therefore, the process of loading, conveying and releasing the stent 10 by using the conveying device is generally as follows: First, load the stent 10 into the loading space of the conveying device and make the proximal end of the stent 10 abut against the distal end of the ejecting part. Then, introduce the distal end of the conveying device into the blood vessel by a conventional method and make the stent 10 be at the diseased position. Finally, the operator controls the driving part 4000 to drive the outer tube 3200 to move relative to the inner tube 3100 in the direction from the distal end to the proximal end to achieve the purpose of releasing the stent 10.

[0065] During the process of releasing the stent 10, the outer tube 3200 is inserted into the stabilizing tube 2000 and moves along the inner cavity of the stabilizing tube 2000. Since the stabilizing tube 2000 does not move during this process, the stabilizing tube 2000 can maintain good coaxiality with the blood vessel. Thus, when the outer tube 3200 moves along the inner cavity of the stabilizing tube 2000, it can also maintain good coaxiality with the blood vessel, avoiding the outer tube 3200 being straightened and adhering to the wall, and also avoiding the situation where the outer tube 3200 squeezes the inner tube 3100 and causes the inner tube 3100 to be straightened. Those skilled in the art know that if the inner tube 3100 is straightened, the distal end of the inner tube 3100 and the distal end of the ejecting portion move in the proximal-to-distal direction, driving the stent 10 to move in the proximal-to-distal direction and deviate from the lesion position, and causing the distal end of the stent 10 to accumulate, which affects the shape of the stent 10 after release. In other words, in the embodiment of the present invention, by providing the stabilizing tube 2000, the positioning accuracy during the release of the stent 10 is improved, and the shape of the stent 10 after release is improved.

[0066] Preferably, the outer tube 3200 includes a second loading section 3201 and a non-loading section 3202 provided on the proximal side of the second loading section 3201. The outer diameter of the second loading section 3201 is greater than the outer diameter of the non-loading section 3202. The second loading section 3201 is used to at least partially coincide axially with the first loading section 3101, so that a loading space is formed between the inner peripheral surface of the second loading section 3201 and the outer peripheral surface of the first loading section 3101. When releasing the stent 10, the non-loading section 3202 moves along the stabilizing tube 2000. The advantage of such a setting is that the radial dimension of the stabilizing tube 2000 can be reduced, thereby reducing the radial dimension of the introduction part of the delivery device, so that the distal end of the delivery device can be introduced into the patient's body through a delivery sheath with a relatively small radial dimension, such as a 6F delivery sheath. Here, the introduction part refers to the part of the delivery device used to enter the patient's body, specifically including part of the structure of the inner tube 3100, part of the structure of the outer tube 3200, and at least part of the structure of the stabilizing tube 2000.

[0067] Optionally, the outer diameter of the second loading section 3201 is 116%-117% of the outer diameter of the non-loading section 3202. The outer diameter of the stabilizing tube 2000 is 100%-110% of the outer diameter of the second loading section 3201. Taking the 6F delivery sheath as an example, combined with the conventional outer diameter of the inner tube 3100 and the wall thickness of the outer tube 3200, it can be calculated that the outer diameter of the second loading section 3201 is 16.7% of the outer diameter of the non-loading section 3202.

[0068] Optionally, asFigures 2 to 4 As shown, the inner tube 3100 includes an inner tube body 3110 and a top tube 3120. The inner tube body 3110 includes the first loading section 3101. The top tube 3120 is sleeved on the inner tube body 3110 and is located on the proximal side of the first loading section 3101. That is, the top tube 3120 constitutes the ejection part. It can be understood that a top head 3121 with a cross-section gradually increasing in the direction from the proximal end to the distal end is preferably formed at the distal end of the top tube 3120. In addition, the proximal ends of the inner tube body 3110 and the top tube 3120 are both connected to the handle 1000.

[0069] Optionally, please continue to refer to Figure 1 and in combination with Figure 5 , the handle 1000 includes a housing 1100 which has an inner cavity. The proximal end of the inner tube 3100 extends into the inner cavity and is connected to the proximal end of the housing 1100. Specifically, the inner tube 3100 further includes an inner tube connector 3130. The inner tube connector 3130 is connected to the proximal end of the inner tube body 3110 and the proximal end of the top tube 3120, and the inner tube connector 3130 is connected to the proximal end of the housing 1100.

[0070] Furthermore, as Figures 6 to 9 shown, the top tube 3120 may include a proximal section 3122 and a distal section 3123 connected axially. Preferably, the stiffness of the distal section 3123 is less than that of the proximal section 3122. For example, the distal section 3123 is a polymer tube so that the distal section 3123 is more easily bent to conform to the shape of the blood vessel, and the proximal section 3122 may be a steel tube so that the proximal section 3122 has better stiffness within the housing 1100. In this way, the proximal section 3122 is connected to the inner tube connector 3130.

[0071] Please return to refer to Figure 1 and in combination with Figure 10 and Figure 11 , the handle 1000 further includes a stress diffusion tube 1200. The stress diffusion tube 1200 is connected to the distal end of the housing 1100, sleeved on the outer peripheral surface of the proximal end of the stabilizing tube 2000, and remains relatively stationary with the stabilizing tube 2000. Please refer to Figure 12, a second connection hole 1210 is provided on the stress diffusion tube 1200. The second connection hole 1210 extends axially through the stress diffusion tube 1200 and includes a proximal hole section 1211 and a distal hole section 1212 that are axially connected. The inner diameter of the proximal hole section 1211 is larger than the inner diameter of the distal hole section 1212, so that the second connection hole 1210 is a stepped hole. The stabilizing tube 2000 includes a stabilizing tube body 2100 and a stabilizing tube connector 2200 provided at the proximal end of the stabilizing tube body 2100. The proximal end of the stabilizing tube body 2100 is inserted into the distal hole section 1212 of the second connection hole 1210, and the stabilizing tube connector 2200 is inserted into the proximal hole section 1211 of the second connection hole 1210. The stabilizing tube connector 2200 and the stress diffusion tube 1200 can be kept axially relatively stationary by the frictional force between the stabilizing tube connector 2200 and the proximal hole section 1211. Preferably, a second circumferential limiting member 2210 is further provided on the outer circumferential surface of the stabilizing tube connector 2200, and a first circumferential limiting member 1213 is further provided on the inner wall of the proximal hole section 1211. One of the second circumferential limiting member 2210 and the first circumferential limiting member 1213 is a protrusion, and the other is a groove. For example, the first circumferential limiting member 1213 is a protrusion, and the second circumferential limiting member 2210 is a groove. The protrusion is inserted into the groove so that the stabilizing tube connector 2200 and the stress diffusion tube 1200 are kept circumferentially relatively stationary. In this way, the stabilizing tube connector 2200 and the stress diffusion tube 1200 are kept relatively stationary, and further the stabilizing tube 2000 and the handle 1000 are kept relatively stationary. Those skilled in the art should know that in alternative embodiments, other methods can also be used to keep the stress diffusion tube 1200 and the stabilizing tube connector 2200 relatively stationary, such as bonding the stress diffusion tube 1200 and the stabilizing tube connector 2200 with an adhesive.

[0072] Please refer to again Figure 1 , Figure 10 , Figure 11 and Figures 13 to 15, the driving part 4000 includes a first roller 4100, a second roller 4200, a sliding part 4300 and a wire 4400. Among them, the first roller 4100 is rotatably arranged on the housing 1100, and a part of the first roller 4100 is located in the inner cavity of the housing 1100, and the other part of the first roller 4100 extends out of the housing 1100. The second roller 4200 is rotatably arranged on the housing 1100 and is located in the inner cavity of the housing 1100. The sliding part 4300 is movably arranged on the housing 1100 and is located in the inner cavity of the housing 1100, and the sliding part 4300 is also connected to the proximal end of the outer tube 3200. The wire 4400 has opposite first and second ends. The first end is connected to the sliding part 4300, and the second end bypasses the second roller 4200 and is also wound around the first roller 4100. When the first roller 4100 rotates in a predetermined direction, the first roller 4100 applies a pulling force from the distal end to the proximal end to the sliding part 4300 through the wire 4400, and drives the sliding part 4300 to move on the housing 1100 in the direction from the distal end to the proximal end, thereby driving the outer tube 3200 to move in the direction from the distal end to the proximal end, so as to achieve the purpose of releasing the stent 10. Optionally, the second roller 4200 is located on the proximal side of the first roller 4100 (such as Figure 11 shown), the second end of the wire 4400 is folded back after bypassing the second roller 4200, and then wound around the first roller 4100. By arranging the second roller 4200 to change the extension direction of the wire 4400, the friction force during the process of the driving part 4000 driving the outer tube 3200 to move in the direction from the distal end to the proximal end is reduced, so as to reduce the external force required for releasing the stent 10 and facilitate the operation. It should be understood that the wire 4400 should always be in a taut state, so that once the first roller 4100 rotates in the predetermined direction, the sliding part 4300 can be driven to move in the direction from the distal end to the proximal end through the wire 4400.

[0073] Optionally, the friction coefficient of the outer surface of the second roller 4200 for contacting the wire 4400 can be less than 0.2. In some embodiments, the surface of the second roller 4200 in contact with the wire 4400 is ground to a friction coefficient less than 0.2, or, in some other embodiments, the second roller 4200 includes a second roller body (not shown in the figure) and a lubricating layer (not shown in the figure) provided on the second roller body. The lubricating layer is used for contacting the wire 4400, and the material of the lubricating layer can be PTFE or other materials with a lower friction coefficient.

[0074] In addition, the sliding part 4300 can be connected to the outer tube 3200 in any suitable manner. Please refer to Figure 14 , in an alternative implementation, a fourth connection hole 4310 is provided on the sliding part 4300, and the fourth connection hole 4310 is a through hole. A second card slot 4320 is further provided on the outer wall of the sliding part 4300, and the number of the second card slots 4320 can be multiple, for example, two. The two second card slots 4320 are symmetrically arranged in the circumferential direction of the fourth connection hole 4310. The outer tube 3200 includes an outer tube body 3210 and an outer tube connector 3220, wherein the outer tube body 3210 includes the second loading section 3201 and the non-loading section 3202, and the outer tube connector 3220 is provided at the proximal end of the outer tube body 3210, specifically at the proximal end of the non-loading section 3202. The outer tube connector 3220 includes a sleeve 3221 and a claw 3222. The claw 3222 is connected to the sleeve 3221, and the claw 3222 is correspondingly arranged with the second card slot 4320, that is, when the number of the second card slots 4320 is two, the number of the claws 3222 is also two, and the two claws 3222 are symmetrically arranged in the circumferential direction of the sleeve 3221. The sleeve 3221 is sleeved on the outer tube body 3210 and is kept relatively stationary with the outer tube body 3210 by any suitable manner, such as gluing. The sleeve 3221 is inserted into the fourth connection hole 4310, and one claw 3222 is inserted into one second card slot 4320 so that the outer tube connector 3220 and the sliding part 4300 are kept axially relatively stationary. Further, a third circumferential limiting member 4311 is provided on the hole wall of the fourth connection hole 4310, and a fourth circumferential limiting member 3223 is provided on the outer peripheral surface of the sleeve 3221. One of the third circumferential limiting member 4311 and the fourth circumferential limiting member 3223 is a groove, and the other is a protrusion. For example, the third circumferential limiting member 4311 is a groove provided on the hole wall of the fourth connection hole 4310, and the fourth circumferential limiting member 3223 is a protrusion provided on the outer peripheral surface of the sleeve 3221. The protrusion is snapped into the groove so that the outer tube connector 3220 and the sliding part 4300 are kept circumferentially relatively stationary.

[0075] The first end of the wire 4400 can be connected to the sliding part 4300 in any suitable manner. Please refer to the figure Figure 14 and Figure 15, a first threading hole 4330 and a second threading hole 4340 are provided on the sliding part 4300. The proximal end of the first threading hole 4330 is an open end, and the first threading hole 4330 is parallel to but not communicated with the fourth connection hole 4310. The axis of the second threading hole 4340 is perpendicular to the axis of the first threading hole 4330, and the second threading hole 4340 is communicated with the first threading hole 4330. The first end of the pulling wire 4400 sequentially passes through the first threading hole 4330 and the second threading hole 4340, and the pulling wire 4400 can be connected to the sliding part 4300 by knotting or binding or any other suitable means.

[0076] Further, the conveying device further includes a guiding mechanism (not marked in the figure), and the guiding mechanism is disposed in the inner cavity of the housing 1100 and extends in the direction from the distal end to the proximal end. The sliding part 4300 is disposed on the guiding mechanism and is used to move along the guiding mechanism.

[0077] Optionally, please refer to Figures 14 to 16 , the guiding mechanism includes a guide rod 5100. The distal end of the guide rod 5100 is connected to the stress diffusion tube 1200, and the proximal end of the guide rod 5100 is connected to the proximal end of the housing 1100. A first connection hole 4350 is provided on the sliding part 4300, and the first connection hole 4350 is parallel to but not communicated with the fourth connection hole 4310. The sliding part 4300 is sleeved on the guide rod 5100 through the first connection hole 4350 and slides along the guide rod 5100. Here, as Figure 12 shown, a third connection hole 1220 is further provided on the stress diffusion tube 1200. The third connection hole 1220 extends axially and is isolated from the second connection hole 1210. The proximal end of the third connection hole 1220 is an open end. The distal end of the guide rod 5100 is inserted into the third connection hole 1220 to realize the connection between the guide rod 5100 and the stress diffusion tube 1200.

[0078] Further, please continue to refer to Figure 15 and in combination with Figure 17, the conveying device further includes a baffle 5200, which is disposed in the inner cavity of the housing 1100 and connected to the housing 1100. A chute 5210 is provided on the baffle 5200 and extends from the distal end to the proximal end. In this way, a part of the sliding part 4300 is disposed in the chute 5210, so that the sliding part 4300 also moves along the chute 5210. That is to say, the chute 5210 and the guide rod 5100 together constitute the guiding mechanism. The advantage of this is that by jointly guiding the sliding part 5300 through the chute 5210 and the guide rod 5100, the circumferential swing of the sliding part 4300 along the guide rod 5100 during the movement can be avoided.

[0079] Optionally, please continue to refer to Figure 17 , the baffle 5200 includes a baffle body 5220, and two ridges 5230 are provided on the baffle body 5220 and extend from the distal end to the proximal end. The two ridges 5230 are arranged at intervals in a direction perpendicular to the guide rod 5100, and the space between the two ridges 5230 constitutes the chute 5210. Further, at least one of the ridges 5230 is formed with notches 5231 arranged in sequence from the distal end to the proximal end. Specifically, the ridge 5230 that is always in contact with the sliding part 4300 is provided with the notches 5231 to reduce the contact area between the ridge 5230 and the sliding part 4300, thereby reducing the friction when the sliding part 4300 moves along the guiding mechanism.

[0080] Further, please refer to Figure 1 and Figure 10 , a guide groove 1110 is further provided on the housing 1100 and extends from the distal end to the proximal end. The driving part 4000 further includes a first operating part 4500, which is connected to the sliding part 4300, and a part of the first operating part 4500 passes through the guide groove 1110 and extends to the outside of the housing 1100. In this way, the operator can directly apply a force from the distal end to the proximal end to the first operating part 4500 to push the sliding part 4300 to move in the direction from the distal end to the proximal end.

[0081] Further, please refer to Figure 6 , Figure 16 and Figure 18, the conveying device further includes a one-way control mechanism 6000, and the purpose of setting the one-way control mechanism 6000 is to prevent the first roller 4100 from rotating in the opposite direction of the predetermined direction. That is, by providing the one-way control mechanism 6000, the first roller 4100 can only rotate in the predetermined direction. Such a configuration enables the driving part 4000 not to drive the sliding part 4300 to move in the proximal-to-distal direction through the rotation of the first roller 4100, nor to drive the outer tube 3200 to move in the proximal-to-distal direction through the rotation of the first roller 4100, and also avoids the slack of the wire 4400 caused by the first roller 4100 rotating in the opposite direction of the predetermined direction.

[0082] Optionally, the one-way control mechanism 6000 includes a check wheel 6100 and a pawl 6200. The check wheel 6100 is provided on the housing 1100 and is located in the inner cavity of the housing 1100, and the check wheel 6100 also remains relatively stationary with respect to the housing 1100. The check wheel 6100 can be connected to the housing 1100 by any suitable method. For example, the one-way control mechanism 6000 further includes a central shaft 6300, the central shaft 6300 is fixedly connected to the housing 1100, and the check wheel 6100 is fixedly sleeved on the central shaft 6300. The check wheel 6100 is also provided with ratchet teeth 6110, and the ratchet teeth 6110 are helical teeth. The pawl 6200 is connected to the first roller 4100, and the pawl 6200 selectively engages or disengages with the ratchet teeth 6110. When the pawl 6200 engages with the ratchet teeth 6110, it prevents the first roller 4100 from rotating in the opposite direction of the predetermined direction. When the pawl 6200 disengages from the ratchet teeth 6110, it allows the first roller 4100 to rotate in the predetermined direction. In this embodiment, please take Figure 18 the orientation shown as an example, the predetermined direction is the counterclockwise direction, and the opposite direction of the predetermined direction is the clockwise direction. When the first roller 4100 is stressed and rotates in the counterclockwise direction, the pawl 6200 always slides along the tooth back of the ratchet teeth 6110, and the ratchet teeth 6110 do not hinder the movement of the pawl 6200, thereby allowing the first roller 4100 to continue rotating in the counterclockwise direction. On the contrary, when the first roller 4100 is stressed and rotates in the clockwise direction, the pawl 6200 slides along the tooth back of one ratchet tooth 6110 to the intersection of two adjacent ratchet teeth 6110 and engages with the ratchet teeth 6110. In this way, the check wheel 6100 prevents the movement of the pawl 6200, and further prevents the first roller 4100 from continuing to rotate in the clockwise direction.

[0083] Further, as Figure 1 ,Figure 10 , Figure 11 , Figure 15 and Figure 19 As shown, the conveying device further includes a limiting part 7000, and the limiting part 7000 is selectively connected or disconnected from the sliding part 4300. When the limiting part 7000 is connected to the sliding part 4300, the sliding part 7000 remains relatively stationary with respect to the housing 1100 to prevent the driving part 4000 from driving the outer tube 3200 to move relative to the inner tube 3100 and the stabilizing tube 2000. When the sliding part 4300 is disconnected from the housing 1100, the sliding part 4300 is allowed to slide on the housing 1100, and then the driving part 4000 is allowed to drive the outer tube 3200 to move relative to the inner tube 3100 and the stabilizing tube 2000. Optionally, an avoidance groove 1120 is provided on the housing 1100 (such as Figure 6 , Figure 7 , Figure 16 marked). As Figure 14 shown, a first clamping groove 4360 is provided on the sliding part 4300, and the first clamping groove 4360 is used to align with the avoidance groove 1120. The limiting part 7000 includes a second operating part 7100 and a clamping block 7200 that are connected to each other. The second operating part 7100 is arranged outside the housing 1100, and the clamping block 7200 is used to pass through the avoidance groove 1120 and insert into the first clamping groove 4360. That is to say, when the clamping block 7200 passes through the avoidance groove 1120 and inserts into the first clamping groove 4360, the limiting part 7000 is connected to the sliding part 4300, and the clamping block 7200 can prevent the sliding part 4300 from moving along the housing 1100 under the restriction of the housing 1100.

[0084] Optionally, the second operating part 7100 is of a ring structure, which is convenient for the operator to apply a force to the second operating part 7100 and pull out the limiting part 7000 from the first clamping groove 4360 and the avoidance groove 1120 and disengage from the housing 1100 to release the connection between the limiting part 7000 and the sliding part 4300. Further, as Figure 17 shown, the baffle 5200 further includes a blocking part 5240. The blocking part 5240 is arranged at the proximal end of the baffle body 5220, and the blocking part 5240 is perpendicular to the baffle body 5220. The proximal end face of the blocking part 5240 is used to abut against the clamping block 7200.

[0085] Based on the structure of the conveying device, the operation of the conveying device when releasing the stent 10 is as follows:

[0086] The operator first applies a force to the second operation part 7100 to pull out the limiting part 7000 from the housing 1100, releasing the connection between the limiting part 7000 and the sliding part 4300.

[0087] After that, the first-stage release is performed. Specifically, the operator applies a force to the first roller 4100 to cause the first roller 4100 to rotate along the predetermined direction. Then, the sliding part 4300 is pulled by the wire 4400 to move in the direction from the distal end to the proximal end, so as to drive the outer tube 3200 to move in the direction from the distal end to the proximal end through the sliding part 4300 until the outer tube 3200 reaches the predetermined position. Here, identification marks may be provided on the outer surface of the housing 1100. When the first operation part 4500 reaches the identification marks, it can be determined that the outer tube 3200 reaches the predetermined position. Usually, when the outer tube 3200 reaches the predetermined position, the distal end of the stent 10 is positioned.

[0088] Finally, the second-stage release is performed. Specifically, the operator applies a force to the first operation part 4500 to directly push the sliding part 4300 to move in the direction from the distal end to the proximal end through the first operation part 4500 until the stent 10 is completely released.

[0089] In the first stage, the first roller 4100 is used to drive the outer tube 3200 to move in the direction from the distal end to the proximal end through the wire 4400 and the sliding part 4300, which is more convenient for controlling the release speed. So that if it is found that the pose of the stent 10 is not good during this process, the outer tube 3200 can be quickly stopped from retracting (that is, controlling the outer tube 3200 to move in the direction from the distal end to the proximal end), and the orientation of the entire delivery device can be readjusted to adjust the pose of the stent 10. In the second stage, the sliding part 4300 is directly driven by the first operation part 7100 to move to retract the outer tube 3200, which can increase the retraction speed of the outer tube 3200, and then increase the release speed of the stent 10.

[0090] It should be noted that for the convenience of assembling the entire delivery device, the housing 1100 usually includes two sub-housings that are spliced together. In addition, the delivery device further includes a guide head 8000, and the guide head 8000 is connected to the distal end of the inner tube body 3110.

[0091] Furthermore, an embodiment of the present invention further provides a medical system. The medical system includes the medical implant and the delivery device. The medical implant includes but is not limited to the stent 10, and the medical implant is used to be loaded between the inner tube 3100 and the outer tube 3200.

[0092] Although the present invention is disclosed as above, it is not limited thereto. Those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims

1. A conveying device, characterized in that, Comprising: A handle, including a housing; A stabilizing tube, connected to the distal end of the handle; A loading and releasing tube, whose proximal end passes through the stabilizing tube and extends into the interior of the handle. The loading and releasing tube includes an inner tube and an outer tube. The inner tube includes an inner tube body and a top tube. The proximal ends of the inner tube body and the top tube are both connected to the handle. The inner tube body includes a first loading section. The top tube is sleeved on the inner tube body and is located on the proximal side of the first loading section. The top tube includes an axially connected proximal section and a distal section, and the stiffness of the distal section is less than that of the proximal section. The outer tube is sleeved on a part of the outer peripheral surface of the inner tube; and, A driving part, including a first roller, a second roller, a sliding part, and a wire. The first roller and the second roller are rotatably arranged on the housing. The sliding part is movably arranged on the housing and is connected to the outer tube. One end of the wire is connected to the sliding part, and the other end of the wire bypasses the second roller and is also wound around the first roller. When the first roller rotates in a predetermined direction, the first roller applies a pulling force from the distal end to the proximal end to the sliding part through the wire, so as to drive the sliding part to move on the housing in the direction from the distal end to the proximal end, and further drive the outer tube to move in the direction from the distal end to the proximal end.

2. The conveying device according to claim 1, characterized in that, The outer tube includes a second loading section and a non-loading section arranged on the proximal side of the second loading section. The outer diameter of the second loading section is larger than that of the non-loading section, and the second loading section is used to at least partially coincide axially with the first loading section, so as to form a loading space between the inner peripheral surface of the second loading section and the outer peripheral surface of the first loading section.

3. The conveying device according to claim 2, wherein, The outer diameter of the second loading section is 116% - 117% of the outer diameter of the non-loading section; and / or, the outer diameter of the stabilizing tube is 100% - 110% of the outer diameter of the second loading section.

4. The conveying device according to claim 1, wherein The second roller is located on the proximal side of the first roller, and the other end of the wire bypasses the second roller and is folded back and wound around the first roller.

5. The conveying device according to claim 1, characterized in that, The first roller is partially arranged inside the housing. The second roller, the sliding part, and the wire are all arranged inside the housing. The conveying device further includes a guiding mechanism. The guiding mechanism is arranged inside the housing and extends in the direction from the distal end to the proximal end. The sliding part is arranged on the guiding mechanism and is used to move along the guiding mechanism.

6. The conveying device according to claim 5, wherein, A guiding groove extending in the direction from the distal end to the proximal end is further provided on the housing. The driving part further includes a first operating part. The first operating part is connected to the sliding part, and the first operating part partially passes through the guiding groove and extends to the outside of the housing.

7. The conveying device according to claim 5, characterized in that, The handle further includes a stress diffusion tube, which is connected to the distal end of the housing; the stress diffusion tube is sleeved on the outer peripheral surface of the proximal end of the stabilizing tube and remains relatively stationary with respect to the stabilizing tube; the conveying device further includes a baffle and a guide rod, the baffle is disposed inside the housing, and a chute extending from the distal end to the proximal end is provided on the baffle; the distal end of the guide rod is connected to the stress diffusion tube, the proximal end of the guide rod is connected to the proximal end of the housing, and the guide rod and the chute constitute the guiding mechanism; the sliding portion includes a first connection hole, the sliding portion is sleeved on the guide rod through the first connection hole, and the sliding portion is also partially disposed in the chute.

8. The conveying device according to claim 7, characterized in that, The baffle includes a baffle body and convex ribs, the number of the convex ribs is two, both convex ribs extend in the direction from the distal end to the proximal end, the two convex ribs are spaced apart in a direction perpendicular to the guide rod, and the space between the two convex ribs constitutes the chute.

9. The conveying device according to claim 8, characterized in that, A plurality of notches arranged in sequence in the direction from the distal end to the proximal end are formed on the convex rib in contact with the sliding portion.

10. The conveying device according to any one of claims 1-3, characterized in that, The handle includes a housing and a stress diffusion tube, the stress diffusion tube is connected to the distal end of the housing, and is sleeved on the outer peripheral surface of the proximal end of the stabilizing tube and remains relatively stationary with respect to the stabilizing tube; a second connection hole is provided on the stress diffusion tube, the second connection hole extends axially through, and includes a proximal hole section and a distal hole section connected axially, the inner diameter of the proximal hole section is larger than that of the distal hole section, and a first circumferential limiting member is further provided on the inner wall of the proximal hole section. The stabilizing tube includes a stabilizing tube body and a stabilizing tube connecting member provided at the proximal end of the stabilizing tube body; a second circumferential limiting member is provided on the outer peripheral surface of the stabilizing tube body; the proximal end of the stabilizing tube body is inserted into the distal hole section of the second connection hole, the stabilizing tube connecting member is disposed in the proximal hole section of the second connection hole, and the second circumferential limiting member is in mating connection with the first circumferential limiting member.

11. The conveying device according to claim 1, characterized in that, The conveying device further includes a one-way control mechanism for preventing the first roller from rotating in the opposite direction of the predetermined direction.

12. The conveying device according to claim 11, characterized in that, The one-way control mechanism includes a check wheel and a pawl, the check wheel is disposed on the housing and is located inside the housing and remains relatively stationary with respect to the housing, and ratchet teeth are provided on the check wheel; the pawl is connected to the first roller, and the pawl is used to selectively engage or disengage with the ratchet teeth. When the pawl engages with the ratchet teeth, it prevents the first roller from rotating in the opposite direction of the predetermined direction. When the pawl disengages from the ratchet teeth, it allows the first roller to rotate in the predetermined direction.

13. The conveying device according to claim 1, characterized in that, The conveying device further includes a limiting part, which is selectively connected to or disconnected from the sliding part; when the limiting part is connected to the sliding part, the sliding part remains relatively stationary with respect to the housing to prevent the driving part from driving the outer tube to move relative to the inner tube and the stabilizing tube, and when the sliding part is disconnected from the housing, the sliding part is allowed to slide on the housing to allow the driving part to drive the outer tube to move relative to the inner tube and the stabilizing tube.

14. The conveying device according to claim 13, characterized in that, The sliding part is arranged inside the housing; an avoidance groove is provided on the housing, a first clamping groove is provided on the sliding part, the limiting part includes a second operating part and a clamping block connected to each other, the second operating part is arranged outside the housing, and the clamping block is used to pass through the avoidance groove and insert into the first clamping groove.

15. The conveying device according to claim 1, characterized in that, A fourth connection hole is provided on the sliding part, a third circumferential limiting part is provided on the hole wall of the fourth connection hole, and a second clamping groove is further provided on the outer wall of the sliding part; The outer tube includes an outer tube body and an outer tube connecting piece arranged on the outer tube body. The outer tube connecting piece includes a sleeve and a claw. A fourth circumferential limiting part is provided on the outer peripheral surface of the sleeve, and the claw is connected to the sleeve; the sleeve is inserted into the fourth connection hole, and the fourth circumferential limiting part is connected in cooperation with the third circumferential limiting part, and one claw is inserted into one second clamping groove.

16. A medical system, characterized in that, It includes a medical implant and the conveying device according to any one of claims 1-15; the medical implant is used to be loaded between the inner tube and the outer tube.

Images