Delivery device and medical system

Abstract

The application provides a delivery device and a medical system. The delivery device comprises a handle, a stabilizing tube, a loading and releasing tube driving part; 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 to the inside of the handle, the loading and releasing tube comprises 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 part of the outer peripheral surface of the inner tube; the driving part is arranged on the handle and connected to the proximal end of the outer tube, and is used for driving the outer tube to generate axial movement relative to the inner tube and the stabilizing tube. When the stent is delivered and released by using the delivery device, the positioning accuracy of the stent can be improved, and the shape of the stent after being released is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a delivery device and a medical system. BACKGROUND

[0002] There are a variety of medical devices available on the market for intraluminal treatment of blood vessels. These devices include stents, volume reduction and thrombectomy, etc. Among them, the stent, as one of the methods for intraluminal treatment of blood vessels, has a very wide application. The stent needs to be delivered and released in the lesion area of the intraluminal blood vessel by a delivery device in the application process.

[0003] 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 shell 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 path by using a guide wire, and sets the inner tube on the guide wire so that the distal end of the delivery device can reach the lesion site along the guide wire, then positions the stent, and finally releases the stent by driving the inner tube and the outer tube to produce axial relative movement. During the release of the stent, the stability of the movement of the outer tube and / or the inner tube needs to be maintained to ensure that the stent can be accurately positioned when released, and to maintain a good shape after the stent is released. However, the existing delivery device often causes the inner tube or the outer tube to be straightened due to stress when driving the inner tube and / or the outer tube to move, which in turn causes inaccurate positioning of the stent, and the accumulation of the distal end of the stent, resulting in poor shape of the stent after release. SUMMARY

[0004] The purpose of the present application is to provide a delivery device and a medical system, which aims to improve the positioning accuracy during the release of the stent and to improve the shape of the stent after release.

[0005] To achieve the above-mentioned purpose, the present application provides a delivery device, comprising:

[0006] a handle;

[0007] a stabilizing tube connected to the distal end of the handle;

[0008] a loading and releasing tube, the proximal end of the loading and releasing tube extending to the inside of the handle through the stabilizing tube, the loading and releasing tube including an inner tube and an outer tube, the proximal end of the inner tube being connected to the handle, and the outer tube being sleeved on part of the outer peripheral surface of the inner tube; and

[0009] a driving part provided on the handle and connected to the proximal end of the outer tube, used to drive the axial movement of the outer tube relative to the inner tube and the stabilizing tube.

[0010] Optionally, the inner tube comprises a first loading section and an ejection portion arranged at the proximal side of the first loading section, the outer diameter of the ejection portion is larger than that of the first loading section; the outer tube comprises a second loading section and a non-loading section arranged at 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 arranged to at least partially coincide with the first loading section in the axial direction, so that a loading space is formed between the inner circumferential surface of the second loading section and the outer circumferential surface of the first loading section.

[0011] Optionally, the outer diameter of the second loading section is 116% to 117% of the outer diameter of the non-loading section; and / or, the outer diameter of the stabilizing tube is 100% to 110% of the outer diameter of the second loading section.

[0012] Optionally, the inner tube comprises an inner tube body and a top tube, the inner tube body comprises the first loading section, the top tube is sleeved on the inner tube body and arranged at the proximal side of the first loading section, so that the top tube constitutes the ejection portion; the proximal end of the inner tube body and the proximal end of the top tube are connected with the handle.

[0013] Optionally, the handle comprises a housing; the driving portion comprises a first roller, a second roller, a sliding portion and a pull wire, the first roller and the second roller are rotatably arranged on the housing, the sliding portion is movably arranged on the housing and connected with the outer tube, one end of the pull wire is connected with the sliding portion, and the other end of the pull wire passes around the second roller and is further wound on the first roller.

[0014] When the first roller rotates in a predetermined direction, the first roller applies a proximal-end-directed distal-end pulling force to the sliding portion through the pull wire, so as to drive the sliding portion to move on the housing in a distal-end-to-proximal-end direction, and further drive the outer tube to move in a distal-end-to-proximal-end direction.

[0015] Optionally, the second roller is arranged at the proximal side of the first roller, and the other end of the pull wire passes around the second roller and is folded back and wound on the first roller.

[0016] Optionally, the first roller is partially arranged inside the housing, and the second roller, the sliding portion and the pull wire are all arranged inside the housing; the delivery device further comprises a guide mechanism arranged in the housing and extending in a distal-end-to-proximal-end direction, and the sliding portion is arranged on the guide mechanism and used to move along the guide mechanism.

[0017] Optionally, the shell is further provided with a guide groove extending from the distal end to the proximal end, and the driving part further comprises a first operating part connected with the sliding part, the first operating part partially penetrating the guide groove and extending to the outside of the shell.

[0018] Optionally, the handle further comprises a stress dispersion tube connected to the distal end of the shell, the stress dispersion tube being sleeved on the proximal end of the stabilizing tube and being relatively stationary with the stabilizing tube; the delivery device further comprises a baffle and a guide rod, the baffle being arranged in the shell, the baffle being provided with a sliding groove extending from the distal end to the proximal end; the distal end of the guide rod is connected with the stress dispersion tube, and the proximal end of the guide rod is connected with the proximal end of the shell, the guide rod and the sliding groove constituting the guide mechanism; the sliding part comprises a first connecting hole, the sliding part being sleeved on the guide rod through the first connecting hole, and the sliding part being further partially arranged in the sliding groove.

[0019] Optionally, the baffle comprises a baffle body and two protrusions, the two protrusions both extending from the distal end to the proximal end, and the two protrusions being arranged in a spaced manner in a direction perpendicular to the guide rod, the space between the two protrusions constituting the sliding groove.

[0020] Optionally, a plurality of notches are formed on the protrusions in sequence from the distal end to the proximal end for disengaging the sliding part.

[0021] Optionally, the handle comprises a shell and a stress dispersion tube, the stress dispersion tube being connected to the distal end of the shell and being sleeved on the proximal end of the stabilizing tube and being relatively stationary with the stabilizing tube; the stress dispersion tube is provided with a second connecting hole extending through in the axial direction, the second connecting hole comprising an axially connected proximal hole segment and a distal hole segment, the inner diameter of the proximal hole segment being larger than the inner diameter of the distal hole segment, and the inner wall of the proximal hole segment being further provided with a first circumferential limiting piece.

[0022] The stabilizing tube comprises a stabilizing tube body and a stabilizing tube connecting piece arranged at the proximal end of the stabilizing tube body, the outer peripheral surface of the stabilizing tube body being provided with a second circumferential limiting piece; the proximal end of the stabilizing tube body is inserted into the distal hole segment of the second connecting hole, the stabilizing tube connecting piece is arranged in the proximal hole segment of the second connecting hole, and the second circumferential limiting piece is connected with the first circumferential limiting piece.

[0023] Optionally, the delivery device further comprises a one-way control mechanism for preventing the first roller from rotating in the opposite direction of the predetermined direction.

[0024] Optionally, the one-way control mechanism comprises a check wheel and a pawl, the check wheel is arranged on the shell and located inside the shell, and remains relatively static with the shell, and the check wheel is provided with a ratchet; the pawl is connected with the first roller, and is used for selectively engaging or disengaging with the ratchet, when the pawl engages with the ratchet, the rotation of the first roller in the opposite direction of the predetermined direction is prevented, and when the pawl disengages with the ratchet, the rotation of the first roller in the predetermined direction is allowed.

[0025] Optionally, the conveying device further comprises a limiting part, the limiting part is selectively connected with or disconnected from the sliding part; when the limiting part is connected with the sliding part, the sliding part remains relatively static with the shell, so as 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 shell, the sliding part is allowed to slide on the shell, so as to allow the driving part to drive the outer tube to move relative to the inner tube and the stabilizing tube.

[0026] Optionally, the sliding part is arranged in the shell; the shell is provided with a avoiding slot, the sliding part is provided with a first clamping slot, the limiting part comprises a second operating part and a clamping block which are connected with each other, the second operating part is arranged outside the shell, and the clamping block is used for penetrating through the avoiding slot and inserting into the first clamping slot.

[0027] Optionally, the sliding part is provided with a fourth connecting hole, a third circumferential limiting part is arranged on the hole wall of the fourth connecting hole, and the outer wall of the sliding part is further provided with two second clamping slots which are symmetrically arranged in the circumferential direction of the fourth connecting hole;

[0028] The outer tube comprises an outer tube body and an outer tube connecting part arranged on the outer tube body, the outer tube connecting part comprises a sleeve and a clamping jaw, a fourth circumferential limiting part is arranged on the outer circumferential surface of the sleeve, and the clamping jaw is connected with the sleeve; the sleeve is inserted into the fourth connecting hole, the fourth circumferential limiting part is connected with the third circumferential limiting part in a matched mode, and one clamping jaw is inserted into one second clamping slot.

[0029] To achieve the above object, the application further provides a medical system, comprising a medical implant and the conveying device as any one of the preceding items; the medical implant is used for being loaded between the inner tube and the outer tube.

[0030] Compared with the prior art, the conveying device and the medical system have the following advantages:

[0031] The aforementioned delivery device comprises a handle, a stabilizing tube, a loading and releasing tube and a driving part; 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 to the inside of the handle, the loading and releasing tube comprises 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 the partial outer circumferential surface of the inner tube; the driving part is arranged on the handle and connected to the proximal end of the outer tube, for driving the outer tube to generate axial movement relative to the inner tube and the stabilizing tube. The partial outer circumferential surface of the inner tube and the partial inner circumferential surface of the outer tube are used to form a loading space for loading medical implants, so that the delivery device can be used to deliver and release medical implants, such as stents, which are loaded in the loading space. When the medical stent reaches the lesion position of the blood vessel, the outer tube is driven by the driving part 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. The delivery device provides a stable moving channel for the outer tube by arranging the stabilizing tube, which avoids the straightening of the outer tube during the movement from the distal end to the proximal end, so that the outer tube can maintain good coaxiality with the blood vessel, thereby avoiding the displacement of the stent caused by the straightening of the inner tube together with the outer tube during the release of the stent, or the accumulation of the distal end of the stent.

[0032] Further, the inner tube comprises a first loading section and an ejection part arranged on the proximal side of the first loading section, the outer diameter of the ejection part is greater than the outer diameter of the first loading section, and the outer tube comprises 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 greater than the outer diameter of the non-loading section, and the second loading section at least partially overlaps the first loading section in the axial direction to form the loading space between the inner circumferential surface of the second loading section and the outer circumferential surface of the first loading section. In this way, 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 is not too large, which is beneficial for using a smaller radial size delivery sheath, such as a 6F delivery sheath, to construct the overall delivery channel, so that the introduction part of the delivery device (i.e. the part introduced into the patient's body, including part of the structure of the inner tube, part of the structure of the outer tube and at least part of the structure of the stabilizing tube) can more easily enter the patient's body. BRIEF DESCRIPTION OF DRAWINGS

[0033] The accompanying drawings are used to better understand the present application and do not constitute an improper limitation on the present application. Among them:

[0034] Figure 1 is a structural schematic diagram of the delivery device provided by the present application according to an embodiment;

[0035] Figure 2 is a schematic view of a part of the delivery device according to an embodiment of the application;

[0036] Figure 3 is a schematic view of a part of the delivery device according to an embodiment of the application, Figure 3 and Figure 2 the site shown;

[0037] Figure 4 is a sectional view of the delivery device at A shown; Figure 3

[0038] Figure 5 is a schematic view of a part of the delivery device according to an embodiment of the application, with a part of the housing removed and mainly showing the connection of the inner tube to the housing;

[0039] Figure 6 is a schematic view of a part of the delivery device according to an embodiment of the application, with a part of the housing removed and mainly showing the proximal end portion of the inner tube, and with the proximal end section of the top tube shown in dashed lines;

[0040] Figure 7 is a schematic view of a part of the delivery device according to an embodiment of the application, with a part of the housing of the handle removed;

[0041] Figure 8 is a sectional view of the delivery device at B-B shown; Figure 7

[0042] Figure 9 is a sectional view of the delivery device at C-C shown; Figure 7

[0043] Figure 10 is a schematic view of a part of the delivery device according to an embodiment of the application, with the stabilizing tube and the loading release tube not shown;

[0044] Figure 11 is a schematic view of a part of the delivery device according to an embodiment of the application, with a part of the housing removed;

[0045] Figure 12 is a schematic view of a part of the delivery device according to an embodiment of the application, mainly showing the connection of the stabilizing tube to the stress dispersion tube;

[0046] Figure 13 is a schematic view of a part of the handle of the delivery device according to an embodiment of the application, with a part of the housing removed and mainly showing the relationship of the second roller to the pull wire;

[0047] Figure 14 ​​​Fig. 1 is a schematic view of a partial structure of a delivery device according to an embodiment of the present application, mainly showing the connection mode of an outer tube and a sliding part;

[0048] Figure 15 Fig. 2 is a schematic view of a partial structure of a delivery device according to an embodiment of the present application, showing the positional relationship of a limiting part, a shell, a baffle, a guide rod, a sliding part and a pull wire;

[0049] Figure 16 Fig. 3 is a schematic view of a handle of a delivery device according to an embodiment of the present application, a part of the shell being removed and the guide rod being fully shown;

[0050] Figure 17 Fig. 4 is a schematic view of a baffle of a delivery device according to an embodiment of the present application;

[0051] Figure 18 Fig. 5 is a schematic view of a partial structure of a delivery device according to an embodiment of the present application, mainly showing a one-way control mechanism;

[0052] Figure 19 Fig. 6 is a schematic view of a partial structure of a delivery device according to an embodiment of the present application, showing the positional relationship of a limiting part and a baffle, a sliding part.

[0053] [The following reference signs are used in the figures:]

[0054] 1000 - handle, 1100 - housing, 1110 - guide slot, 1120 - escape slot, 1200 - stress dispersion tube, 1210 - second connecting hole, 1211 - proximal hole segment, 1212 - distal hole segment, 1213 - first circumferential limiting member, 1220 - third connecting hole, 2000 - stabilizing tube, 2100 - stabilizing tube body, 2200 - stabilizing tube connecting member, 2210 - second circumferential limiting member, 3000 - loading and releasing tube, 3100 - inner tube, 3101 - first loading segment, 3110 - inner tube body, 3120 - top tube, 3121 - ejection head, 3122 - proximal segment, 3123 - distal segment, 3130 - inner tube connecting member, 3200 - outer tube, 3201 - second loading segment, 3202 - non-loading segment, 3210 - outer tube body, 3220 - outer tube connecting member, 3221 - sleeve, 3222 - clamping claw, 4000 - driving part, 4100 - first roller, 4200 - second roller, 4300 - sliding part, 4310 - fourth connecting hole, 4311 - third circumferential limiting member, 3223 - fourth circumferential limiting member, 4320 - second clamping slot, 4330 - first threading hole, 4340 - second threading hole, 4350 - first connecting hole, 4360 - first clamping slot, 4400 - pull wire, 4500 - first operating part, 5100 - guide rod, 5200 - baffle, 5210 - sliding slot, 5220 - baffle body, 5230 - protruding rib, 5231 - notch, 5240 - blocking part, 6100 - check wheel, 6110 - ratchet, 6200 - pawl, 6300 - central shaft, 7000 - limiting part, 7100 - second operating part, 7200 - clamping block, 8000 - guide head; 10 - support. DETAILED DESCRIPTION

[0055] The present application is herein described, by way of example only, with reference to embodiments thereof. It is contemplated that deviations in form can be made thereto without departing from the spirit of the application and that the scope of the application should be governed by the following claims and their legal equivalents.

[0056] In addition, each of the embodiments described below has one or more technical features, but this does not mean that all technical features in any embodiment must be implemented at the same time, or only one or more technical features in different embodiments can be implemented separately. In other words, under the premise of being possible, those skilled in the art can selectively implement some or all of the technical features in any embodiment, or selectively implement a combination of some or all of the technical features in multiple embodiments, according to the disclosure of the present application, and according to the design specifications or implementation needs, thereby increasing the flexibility of the implementation of the present application.

[0057] As used in this specification, the singular forms "a," "an" and "the" include plural referents unless the content clearly dictates otherwise. As used in this specification, the term "or" is generally employed in its sense of "and / or" unless the content clearly dictates otherwise, and the terms "mounting", "connected", "connecting" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection. It can be mechanical connection, or electrical connection. It can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements. Those skilled in the art can understand the specific meaning of the above terms in the present application according to the specific circumstances.

[0058] In addition, in this paper, the terms "proximal" and "distal" are the relative orientation, relative position, direction of elements or actions relative to each other from the perspective of the doctor using the medical device, although "proximal" and "distal" are not restrictive, but "proximal" generally refers to the end of the medical device close to the doctor during normal operation, and "distal" generally refers to the end first entering the patient's body.

[0059] In order to make the purpose, advantages and characteristics of the present application clearer, the present application will be further described in detail below in combination with the drawings. It should be noted that the drawings are very simplified and use non-precise proportions, only to facilitate and clearly assist the purpose of explaining the embodiments of the present application. The same or similar reference signs in the drawings represent the same or similar parts.

[0060] Figure 1 The structural schematic diagram of the delivery device provided by the embodiment of the present application 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 A in FIG. 1. As shown in Figures 1 to 4 , the delivery device includes a handle 1000, a stabilizing tube 2000, a loading and releasing tube 3000, and a driving part 4000Figures 1 to 4 See the description of Figure 11 The proximal end of the loading and releasing tube 3000 passes through the stabilizing tube 2000 and extends to the inside of the handle 1000. The loading and releasing tube 3000 comprises 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 part of the outer circumferential surface of the inner tube 3100. The driving part 4000 is arranged on the handle 1000 and connected to the proximal end of the outer tube 3200. The driving part 4000 is used to drive the outer tube 3200 to move axially relative to the inner tube 3100 and the stabilizing tube 2000.

[0061] Preferably, the inner tube 3100 comprises a first loading section 3101 and an ejection part (not shown in the figure), which is arranged at the proximal end side of the first loading section 3101 and has an outer diameter larger than that of the first loading section 3101. Part of the structure of the outer tube 3200 is used to coincide with the first loading section 3101 in the axial direction, so that a loading space is formed between the inner circumferential surface of the outer tube 3200 and the outer circumferential surface of the first loading section 3101.

[0062] The delivery device is used to load a medical implant and deliver and release the medical implant at a lesion site in a blood vessel. The medical implant includes but is not limited to a stent 10 (as shown in Figure 2 In addition, in the embodiment of the present application, the inner tube 3100 and the stabilizing tube 2000 remain relatively static 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 stabilizing tube 2000. Therefore, the process of loading, delivering and releasing the stent 10 by using the delivery device is roughly as follows: first, the stent 10 is loaded into the loading space of the delivery device, and the proximal end of the stent 10 abuts against the distal end of the ejection part. Then, the distal end of the delivery device is introduced into the blood vessel in a conventional manner, and the stent 10 is placed at the lesion site. Finally, the operator controls the driving part 4000 to drive the outer tube 3200 to move from the distal end to the proximal end relative to the inner tube 3100, so as to achieve the purpose of releasing the stent 10.

[0063] In the process of releasing the stent 10, the outer tube 3200 is arranged in the stabilizing tube 2000 and moves along the inner cavity of the stabilizing tube 2000. Since the stabilizing tube 2000 does not move in this process, the stabilizing tube 2000 can maintain good coaxiality with the blood vessel, so that the outer tube 3200 can also maintain good coaxiality with the blood vessel when moving along the inner cavity of the stabilizing tube 2000, avoiding the outer tube 3200 being straightened and adhering to the wall, and avoiding the situation that the inner tube 3100 is straightened due to the outer tube 3200 pressing the inner tube 3100. It is known to those skilled in the art that if the inner tube 3100 is straightened, the distal end of the inner tube 3100 and the distal end of the ejection portion move from the proximal end to the distal end, and drive the stent 10 to move from the proximal end to the distal end to deviate from the lesion position, and cause the distal end of the stent 10 to accumulate and affect the shape of the stent 10 after release. In other words, in the embodiment of the present application, the positioning accuracy of the stent 10 during release is improved, and the shape of the stent 10 after release is improved.

[0064] Preferably, the outer tube 3200 comprises a second loading section 3201 and a non-loading section 3202 arranged on the proximal side of the second loading section 3201, and 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 with the first loading section 3101 in the axial direction, so that the inner circumferential surface of the second loading section 3201 and the outer circumferential surface of the first loading section 3101 form the loading space. In the process of releasing the stent 10, the non-loading section 3202 moves along the stabilizing tube 2000. The advantage of such an arrangement is that the radial size of the stabilizing tube 2000 can be reduced, thereby reducing the radial size of the introduction portion 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 smaller radial size, for example, a 6F delivery sheath. Here, the introduction portion refers to the portion 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.

[0065] 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 delivery sheath as a 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, the outer diameter of the second loading section 3201 can be calculated as 16.7% of the outer diameter of the non-loading section 3202.

[0066] 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 located at the proximal end side of the first loading section 3101, that is, the top tube 3120 constitutes the ejection part. It can be understood that the distal end of the top tube 3120 is also preferably formed with an ejection head 3121 with a gradually increasing cross section in the proximal-to-distal direction, and the proximal end of the inner tube body 3110 and the proximal end of the top tube 3120 are both connected with the handle 1000.

[0067] Optionally, please continue to refer to Figure 1 and in combination with Figure 5 , the handle 1000 includes a housing 1100, the housing 1100 has an inner cavity, the proximal end of the inner tube 3100 extends to the inner cavity and is connected with 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 with 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 with the proximal end of the housing 1100.

[0068] Further, as Figures 6 to 9 shown, the top tube 3120 can include an axially connected proximal section 3122 and a distal section 3123, and preferably the rigidity 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 can be a steel tube, so that the proximal section 3122 has better rigidity in the housing 1100. In this way, the proximal section 3122 is connected with the inner tube connector 3130.

[0069] Please refer back 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, and is 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 12The stress dispersion tube 1200 is provided with a second connecting hole 1210 extending through the stress dispersion tube 1200 along the axial direction and including an axially connected proximal hole section 1211 and a distal hole section 1212, and the inner diameter of the proximal hole section 1211 is greater than that of the distal hole section 1212 so that the second connecting hole 1210 is a stepped hole. The stabilizing tube 2000 includes a stabilizing tube body 2100 and a stabilizing tube connecting piece 2200 arranged 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 connecting hole 1210, and the stabilizing tube connecting piece 2200 is inserted into the proximal hole section 1211 of the second connecting hole 1210, and the stabilizing tube connecting piece 2200 can be kept axially relatively stationary with the stress dispersion tube 1200 by the friction between the stabilizing tube connecting piece 2200 and the proximal hole section 1211. Preferably, the outer circumferential surface of the stabilizing tube connecting piece 2200 is further provided with a second circumferential limiting piece 2210, and the inner wall of the proximal hole section 1211 is further provided with a first circumferential limiting piece 1213, one of the second circumferential limiting piece 2210 and the first circumferential limiting piece 1213 is a protrusion, and the other is a groove, for example, the first circumferential limiting piece 1213 is a protrusion, and the second circumferential limiting piece 2210 is a groove, and the protrusion is inserted into the groove so that the stabilizing tube connecting piece 2200 and the stress dispersion tube 1200 are kept circumferentially relatively stationary. In this way, the stabilizing tube connecting piece 2200 and the stress dispersion tube 1200 are kept relatively stationary, and in turn, the stabilizing tube 2000 and the handle 1000 are kept relatively stationary. Those skilled in the art should know that in alternative embodiments, other ways can also be used to keep the stress dispersion tube 1200 and the stabilizing tube connecting piece 2200 relatively stationary, for example, by using adhesive to bond the stress dispersion tube 1200 and the stabilizing tube connecting piece 2200.

[0070] Please refer to Figure 1 , Figure 10 , Figure 11 and Figures 13 to 15The driving part 4000 comprises a first roller 4100, a second roller 4200, a sliding part 4300 and a pull wire 4400. The first roller 4100 is rotatably arranged on the shell 1100, and a part of the first roller 4100 is located in the inner cavity of the shell 1100, and the other part of the first roller 4100 extends outside the shell 1100. The second roller 4200 is rotatably arranged on the shell 1100 and located in the inner cavity of the shell 1100. The sliding part 4300 is movably arranged on the shell 1100 and located in the inner cavity of the shell 1100, and the sliding part 4300 is further connected with the proximal end of the outer tube 3200. The pull wire 4400 has opposite first and second ends, the first end is connected with the sliding part 4300, and the second end passes around the second roller 4200 and is further wound around the first roller 4100. When the first roller 4100 rotates in a predetermined direction, the first roller 4100 applies a pulling force to the sliding part 4300 in a direction from the distal end to the proximal end through the pull wire 4400, and drives the sliding part 4300 to move on the shell 1100 in a direction from the distal end to the proximal end, thereby driving the outer tube 3200 to move in a 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 (as shown in Figure 11 Fig. 1), and the second end of the pull wire 4400 is folded back after passing around the second roller 4200 and is then wound around the first roller 4100. By arranging the second roller 4200 to change the extension direction of the pull wire 4400, the frictional force in the process of driving the outer tube 3200 to move in a direction from the distal end to the proximal end is reduced, so that the external force required to release the stent 10 is reduced, facilitating operation. It should be understood that the pull 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 a direction from the distal end to the proximal end by the pull wire 4400.

[0071] Optionally, the outer surface of the second roller 4200 for contacting the pull wire 4400 has a friction coefficient less than 0.2. In some embodiments, the surface of the second roller 4200 for contacting the pull wire 4400 is ground to have a friction coefficient less than 0.2, or, in other embodiments, the second roller 4200 comprises a second roller body (not shown in the figure) and a lubricating layer (not shown in the figure) arranged on the second roller body, the lubricating layer is used to contact the pull wire 4400, and the material of the lubricating layer can be PTFE or other materials with low friction coefficient.

[0072] In addition, the sliding part 4300 can be connected with the outer tube 3200 in any suitable manner. Please refer to Figure 14 In an alternative implementation, the sliding part 4300 is provided with a fourth connecting hole 4310, which is a through hole. The outer wall of the sliding part 4300 is further provided with a second clamping groove 4320, which can be multiple, for example two. The two second clamping grooves 4320 are symmetrically arranged in the circumferential direction of the fourth connecting hole 4310. The outer tube 3200 comprises an outer tube body 3210 and an outer tube connecting piece 3220, wherein the outer tube body 3210 comprises the second loading section 3201 and the non-loading section 3202, and the outer tube connecting piece 3220 is arranged at the proximal end of the outer tube body 3210, specifically at the proximal end of the non-loading section 3202. The outer tube connecting piece 3220 comprises a sleeve 3221 and a clamping jaw 3222, the clamping jaw 3222 is connected with the sleeve 3221, and the clamping jaw 3222 is arranged correspondingly with the second clamping groove 4320, that is, when the number of the second clamping groove 4320 is two, the number of the clamping jaw 3222 is also two, and the two clamping jaws 3222 are symmetrically arranged in the circumferential direction of the sleeve 3221. The sleeve 3221 is sleeved on the outer tube body 3210 and remains relatively stationary with the outer tube body 3210 by any suitable means, for example, adhesive means. The sleeve 3221 is inserted into the fourth connecting hole 4310, and one clamping jaw 3222 is inserted into one second clamping groove 4320, so that the outer tube connecting piece 3220 and the sliding part 4300 remain axially relatively stationary. Further, the hole wall of the fourth connecting hole 4310 is provided with a third circumferential limiting piece 4311, and the outer circumferential surface of the sleeve 3221 is provided with a fourth circumferential limiting piece 3223, one of the third circumferential limiting piece 4311 and the fourth circumferential limiting piece 3223 is a groove, and the other is a protrusion, for example, the third circumferential limiting piece 4311 is a groove arranged on the hole wall of the fourth connecting hole 4310, and the fourth circumferential limiting piece 3223 is a protrusion arranged on the outer circumferential surface of the sleeve 3221, the protrusion is clamped into the groove, so that the outer tube connecting piece 3220 and the sliding part 4300 remain circumferentially relatively stationary.

[0073] The first end of the pull wire 4400 can be connected with the sliding part 4300 in any suitable manner. Please refer to Figure 14 and Figure 15The sliding part 4300 is provided with a first threading hole 4330 and a second threading hole 4340. The first threading hole 4330 has an open proximal end, and the first threading hole 4330 is parallel to the fourth connecting hole 4310 but not in communication with the fourth connecting hole 4310. The second threading hole 4340 is perpendicular to the first threading hole 4330 in terms of the axis, and the second threading hole 4340 is in communication with the first threading hole 4330. The first end of the pull wire 4400 passes through the first threading hole 4330 and the second threading hole 4340 in sequence, and the connection between the pull wire 4400 and the sliding part 4300 can be achieved by knotting, binding or other suitable means.

[0074] Further, the delivery device further comprises a guide mechanism (not labeled in the figure), which is arranged 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 arranged on the guide mechanism and is used to move along the guide mechanism.

[0075] Optionally, referring to Figures 14 to 16 The guide mechanism comprises a guide rod 5100, the distal end of the guide rod 5100 is connected with the stress dispersion tube 1200, and the proximal end of the guide rod 5100 is connected with the proximal end of the housing 1100. The sliding part 4300 is provided with a first connecting hole 4350, and the first connecting hole 4350 is parallel to the fourth connecting hole 4310 but not in communication with the fourth connecting hole 4310. The sliding part 4300 is sleeved on the guide rod 5100 through the first connecting hole 4350 and slides along the guide rod 5100. Here, as shown in Figure 12 The stress dispersion tube 1200 is further provided with a third connecting hole 1220, the third connecting hole 1220 extends in the axial direction and is isolated from the second connecting hole 1210, and the proximal end of the third connecting hole 1220 is an open end. The distal end of the guide rod 5100 is inserted into the third connecting hole 1220 to achieve the connection between the guide rod 5100 and the stress dispersion tube 1200.

[0076] Further, please continue to refer to Figure 15 and combine with Figure 17The conveying device further comprises a baffle 5200 arranged in the inner cavity of the shell 1100 and connected with the shell 1100. The baffle 5200 is provided with a sliding groove 5210 connected from the distal end to the proximal end. In this way, the sliding part 4300 is partially arranged in the sliding groove 5210, so that the sliding part 4300 also moves along the sliding groove 5210. That is, the sliding groove 5210 and the guide rod 5100 jointly constitute the guide mechanism. The advantage of this is that the sliding part 5300 is guided by the sliding groove 5210 and the guide rod 5100, which can avoid the circumferential swing of the sliding part 4300 during movement along the guide rod 5100.

[0077] Optionally, please continue to refer to Figure 17 The baffle 5200 comprises a baffle body 5220 provided with two convex edges 5230 extending in the direction from the distal end to the proximal end. The two convex edges 5230 are arranged in a spaced manner in the direction perpendicular to the guide rod 5100, and the space between the two convex edges 5230 constitutes the sliding groove 5210. Further, at least one of the convex edges 5230 is formed with a notch 5231 arranged in the direction from the distal end to the proximal end in sequence. Specifically, the convex edge 5230 always in contact with the sliding part 4300 is provided with the notch 5231, so as to reduce the contact area between the convex edge 5230 and the sliding part 4300, and further reduce the friction when the sliding part 4300 moves along the guide mechanism.

[0078] Further, please refer to Figure 1 and Figure 10 The shell 1100 is further provided with a guide groove 1110 extending in the direction from the distal end to the proximal end. The driving part 4000 further comprises a first operation part 4500 connected with the sliding part 4300, and the first operation part 4500 partially penetrates through the guide groove 1110 and extends to the outside of the shell 1100. In this way, the operator can directly apply a force in the direction from the distal end to the proximal end to the first operation part 4500 to push the sliding part 4300 to move in the direction from the distal end to the proximal end.

[0079] Further, please refer to Figure 6 , Figure 16 and Figure 18The conveying device further comprises a one-way control mechanism 6000, which is arranged to prevent the first roller 4100 from rotating in the opposite direction of the predetermined direction. That is, the first roller 4100 is arranged to rotate only in the predetermined direction by the one-way control mechanism 6000. Such an arrangement prevents the driving portion 4000 from driving the sliding portion 4300 to move in the proximal-to-distal direction by the rotation of the first roller 4100, and prevents the outer tube 3200 from moving in the proximal-to-distal direction by the rotation of the first roller 4100, and prevents the first roller 4100 from rotating in the opposite direction of the predetermined direction, which would cause the pull wire 4400 to slacken.

[0080] Optionally, the one-way control mechanism 6000 comprises a ratchet wheel 6100 and a pawl 6200. The ratchet wheel 6100 is arranged in the inner cavity of the housing 1100 and is kept relatively stationary with the housing 1100. The ratchet wheel 6100 can be connected to the housing 1100 by any suitable method, for example, the one-way control mechanism 6000 further comprises a central shaft 6300, which is fixedly connected to the housing 1100, and the ratchet wheel 6100 is fixedly sleeved on the central shaft 6300. The ratchet wheel 6100 is further provided with ratchet teeth 6110, which are inclined teeth. The pawl 6200 is connected to the first roller 4100 and 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, and 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, for example, the predetermined direction is counterclockwise and the opposite direction of the predetermined direction is clockwise, as shown in the orientation of Figure 18 When the first roller 4100 is forced to rotate 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 to rotate in the counterclockwise direction. Conversely, when the first roller 4100 is forced to rotate in the clockwise direction, the pawl 6200 slides along the tooth back of one ratchet tooth 6110 to the intersection of the adjacent two ratchet teeth 6110 and engages with the ratchet teeth 6110, so that the ratchet wheel 6100 prevents the pawl 6200 from moving, thereby preventing the first roller 4100 from continuing to rotate in the clockwise direction.

[0081] Further, as shown in Figure 1 ,Figure 10 , Figure 11 , Figure 15 and Figure 19 As shown, the conveying device further includes a limiting part 7000, which selectively connects to or disconnects 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, preventing 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, thereby allowing the driving part 4000 to drive the outer tube 3200 to move relative to the inner tube 3100 and the stabilizing tube 2000. Optionally, the housing 1100 is provided with a clearance groove 1120 (e.g., Figure 6 , Figure 7 , Figure 16 (as marked in the text). Figure 14 As shown, the sliding part 4300 is provided with a first slot 4360, which is used to align with the clearance slot 1120. The limiting part 7000 includes a second operating part 7100 and a locking block 7200 connected to each other. The second operating part 7100 is disposed outside the housing 1100, and the locking block 7200 is used to pass through the clearance slot 1120 and insert into the first slot 4360. That is, when the locking block 7200 passes through the clearance slot 1120 and inserts into the first slot 4360, the limiting part 7000 is connected to the sliding part 4300, and the locking block 7200 can prevent the sliding part 4300 from moving along the housing 1100 under the restriction of the housing 1100.

[0082] Optionally, the second operating part 7100 has a ring-shaped structure, which facilitates the operator to apply force to the second operating part 7100 and pull the limiting part 7000 out of the first slot 4360 and the clearance slot 1120 and detach it from the housing 1100, thereby releasing the connection between the limiting part 7000 and the sliding part 4300. Further, as Figure 17 As shown, the baffle 5200 further includes a stop portion 5240, which is disposed at the proximal end of the baffle body 5220 and is perpendicular to the baffle body 5220. The proximal end face of the stop portion 5240 is used to abut against the locking block 7200.

[0083] Based on the structure of the conveying device, the operation of the conveying device when releasing the support 10 is as follows:

[0084] The operator first applies force to the second operation part 7100 to pull the limiting part 7000 out of the shell 1100, thereby releasing the connection between the limiting part 7000 and the sliding part 4300.

[0085] Then, the first stage of release is performed, specifically, the operator applies force to the first roller 4100 to rotate the first roller 4100 in the predetermined direction, thereby pulling the sliding part 4300 in the distal-to-proximal direction through the pull wire 4400 to drive the outer tube 3200 in the distal-to-proximal direction through the sliding part 4300 until the outer tube 3200 reaches the predetermined position. Here, the outer surface of the shell 1100 can be provided with an identification mark, and when the first operation part 4500 reaches the identification mark, it can be determined that the outer tube 3200 reaches the predetermined position. Generally, when the outer tube 3200 reaches the predetermined position, the distal end of the stent 10 is positioned.

[0086] Finally, the second stage of release is performed, specifically, the operator applies force to the first operation part 4500 to directly push the sliding part 4300 in the distal-to-proximal direction through the first operation part 4500 until the stent 10 is completely released.

[0087] In the first stage, the first roller 4100 drives the outer tube 3200 in the distal-to-proximal direction through the pull wire 4400 and the sliding part 4300, which is more convenient for controlling the release speed, so that if the pose of the stent 10 is found to be poor during this process, the outer tube 3200 can be quickly stopped from being withdrawn (i.e., the movement of the outer tube 3200 in the distal-to-proximal direction is controlled), and the position of the entire delivery device is adjusted to adjust the pose of the stent 10. In the second stage, the sliding part 4300 is directly driven to move to withdraw the outer tube 3200 through the first operation part 7100, which can increase the withdrawal speed of the outer tube 3200 and thereby increase the release speed of the stent 10.

[0088] It should be noted that, in order to facilitate the assembly of the entire delivery device, the shell 1100 generally includes two sub-shells that are spliced together. In addition, the delivery device further includes a guide head 8000 connected to the distal end of the inner tube body 3110.

[0089] Further, the embodiments of the present application also provide a medical system, which 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.

[0090] While the application has been disclosed in connection with the preferred embodiments provided herein, it should be understood that many modifications, substitutions, and changes can be made by those skilled in the art without departing from the spirit or scope of the application. Accordingly, it is intended that all such alterations and variations be considered as within the spirit and scope of the application as defined by the following claims, if any, and their equivalents.

Claims

1. A delivery device characterized by, The application relates to a delivery device, comprising: a handle comprising a housing; a stabilizing tube connected to a distal end of the handle; a loading and releasing tube, a proximal end of which passes through the stabilizing tube and extends to the inside of the handle, the loading and releasing tube comprising an inner tube and an outer tube, the proximal end of the inner tube being connected to the handle, and the outer tube being sleeved on part of the outer circumferential surface of the inner tube; and a driving part comprising a first roller, a second roller, a sliding part and a pull wire, the first roller and the second roller being rotatably arranged on the housing, the sliding part being movably arranged on the housing and connected to the outer tube, one end of the pull wire being connected to the sliding part, and the other end of the pull wire passing through the second roller and being wound around the first roller; when the first roller rotates in a predetermined direction, the first roller applies a pulling force to the sliding part in a direction from the distal end to the proximal end through the pull wire, so as to drive the sliding part to move on the housing in a direction from the distal end to the proximal end, and further drive the outer tube to move in a direction from the distal end to the proximal end.

2. The delivery device of claim 1, wherein, The inner tube comprises a first loading section and an ejection part arranged on the proximal end side of the first loading section, and the outer diameter of the ejection part is larger than that of the first loading section; the outer tube comprises a second loading section and a non-loading section arranged on the proximal end 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 arranged to at least partially coincide with the first loading section in the axial direction, so that a loading space is formed between the inner circumferential surface of the second loading section and the outer circumferential surface of the first loading section.

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

4. The delivery device of claim 2, wherein, The inner tube comprises an inner tube body and a top tube, the inner tube body comprises the first loading section, the top tube is sleeved on the inner tube body and located on the proximal end side of the first loading section, so that the top tube constitutes the ejection part; the proximal end of the inner tube body and the proximal end of the top tube are connected to the handle.

5. The delivery device of claim 1, wherein, The second roller is located on the proximal end side of the first roller, and the other end of the pull wire passes through the second roller and is folded back and wound around the first roller.

6. The delivery device of claim 1, wherein, The first roller is partially arranged in the inside of the housing, and the second roller, the sliding part and the pull wire are all arranged in the inside of the housing; the delivery device further comprises a guide mechanism arranged in the housing and extending in a direction from the distal end to the proximal end, and the sliding part is arranged on the guide mechanism and used for moving along the guide mechanism.

7. The delivery device of claim 6, wherein, The housing is further provided with a guide groove extending in a direction from the distal end to the proximal end, and the driving part further comprises a first operation part connected to the sliding part, the first operation part partially passing through the guide groove and extending to the outside of the housing.

8. The delivery device of claim 6, wherein, The handle further comprises a stress dispersion tube connected to the distal end of the shell; the stress dispersion tube is sleeved on the outer circumferential surface of the proximal end of the stabilizing tube and remains relatively static with the stabilizing tube; the conveying device further comprises a baffle and a guide rod, the baffle is arranged in the shell, and the baffle is provided with a sliding groove extending from the distal end to the proximal end; the distal end of the guide rod is connected with the stress dispersion tube, and the proximal end of the guide rod is connected with the proximal end of the shell; the guide rod and the sliding groove constitute the guide mechanism; the sliding part comprises a first connecting hole, the sliding part is sleeved on the guide rod through the first connecting hole, and the sliding part is further partially arranged in the sliding groove.

9. The delivery device of claim 8, wherein, The baffle comprises a baffle body and two ribs, the two ribs extend from the distal end to the proximal end, and the two ribs are arranged in a spaced manner in a direction perpendicular to the guide rod, and the space between the two ribs constitutes the sliding groove.

10. The delivery device of claim 9, wherein, A plurality of notches are formed on the rib in contact with the sliding part and arranged in sequence from the distal end to the proximal end.

11. The delivery device of any of claims 1-4, wherein, The handle comprises a shell and a stress dispersion tube, the stress dispersion tube is connected to the distal end of the shell, and is sleeved on the outer circumferential surface of the proximal end of the stabilizing tube and remains relatively static with the stabilizing tube; the stress dispersion tube is provided with a second connecting hole, the second connecting hole extends through in the axial direction, and comprises an axially connected proximal hole section and a distal hole section, the inner diameter of the proximal hole section is greater than that of the distal hole section, and a first circumferential limiting piece is further arranged on the inner wall of the proximal hole section; The stabilizing tube comprises a stabilizing tube body and a stabilizing tube connecting piece arranged at the proximal end of the stabilizing tube body, and a second circumferential limiting piece is arranged on the outer circumferential surface of the stabilizing tube body; the proximal end of the stabilizing tube body is inserted into the distal hole section of the second connecting hole, the stabilizing tube connecting piece is arranged in the proximal hole section of the second connecting hole, and the second circumferential limiting piece is connected with the first circumferential limiting piece.

12. The delivery device of claim 1, wherein, The conveying device further comprises a one-way control mechanism for preventing the first roller from rotating in the opposite direction of the predetermined direction.

13. The delivery device of claim 12, wherein, The one-way control mechanism comprises a check wheel and a pawl, the check wheel is arranged on the shell and located in the interior of the shell, and remains relatively static with the shell, and the check wheel is provided with a ratchet tooth; the pawl is connected with the first roller, and the pawl is used for selectively engaging or disengaging with the ratchet tooth; when the pawl engages with the ratchet tooth, the rotation of the first roller in the opposite direction of the predetermined direction is prevented; when the pawl disengages from the ratchet tooth, the rotation of the first roller in the predetermined direction is allowed.

14. The delivery device of claim 1, wherein, The delivery device further comprises a limiting part selectively connected with or disconnected from the sliding part; when the limiting part is connected with the sliding part, the sliding part keeps relatively static with the shell to prevent the driving part from driving the outer tube to move relative to the inner tube and the stabilizing tube; when the sliding part is disconnected from the shell, the sliding part is allowed to slide on the shell to allow the driving part to drive the outer tube to move relative to the inner tube and the stabilizing tube.

15. The delivery device of claim 14, wherein, The sliding part is arranged in the shell; the shell is provided with an avoiding slot, the sliding part is provided with a first clamping slot, the limiting part comprises a second operating part and a clamping block connected with each other, the second operating part is arranged outside the shell, and the clamping block is used to pass through the avoiding slot and insert into the first clamping slot.

16. The delivery device of claim 1, wherein, The sliding part is provided with a fourth connecting hole, and a third circumferential limiting piece is arranged on a hole wall of the fourth connecting hole; and a second clamping slot is further arranged on an outer wall of the sliding part. The outer tube comprises an outer tube body and an outer tube connecting piece arranged on the outer tube body; the outer tube connecting piece comprises a sleeve and a clamping jaw; a fourth circumferential limiting piece is arranged on an outer peripheral surface of the sleeve; and the clamping jaw is connected with the sleeve; the sleeve is inserted into the fourth connecting hole, and the fourth circumferential limiting piece is connected with the third circumferential limiting piece in a matched mode; and one clamping jaw is inserted into one second clamping slot.

17. A medical system, characterized by The delivery device comprises a medical implant and a delivery device as claimed in any one of claims 1-16; and the medical implant is arranged between the inner tube and the outer tube. The delivery device comprises a medical implant and a delivery device as claimed in any one of claims 1-16; and the medical implant is arranged between the inner tube and the outer tube.

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