A catheter assembly, a medical delivery device, and a medical system

Abstract

This invention provides a catheter assembly, a medical delivery device, and a system. The catheter assembly includes an outer tube, an inner tube, and a connecting mechanism. The outer tube is fitted onto a portion of the outer surface of the inner tube and is axially movable relative to the inner tube. The proximal end of the outer tube is sealed to the outer surface of the inner tube via the connecting mechanism. The inner tube includes an inner tube body, and a first limiting portion is provided on the outer surface of the inner tube body. The outer diameter of the first limiting portion is larger than the outer diameter of the inner tube body, and the first limiting portion is disposed within the outer tube. The connecting mechanism includes a first connecting portion and a second connecting portion connected to each other. The first connecting portion is disposed at the proximal end of the outer tube. The second connecting portion is movably fitted onto the inner tube body and is located on the proximal side of the first limiting portion. The second connecting portion is also used to abut against the first limiting portion when the inner tube moves a predetermined distance relative to the outer tube in a distal-to-proximal direction, thereby preventing the inner tube from continuing to move in the distal-to-proximal direction and avoiding separation of the inner tube and outer tube or damage to the seal between them.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a catheter assembly, a medical delivery device, and a medical system. Background Technology

[0002] Aortic diseases, such as aortic dissection, are among the most deadly and difficult-to-treat vascular surgical diseases. Endovascular aortic repair (EVAR) using a endovascular stent graft is a minimally invasive interventional treatment method developed in recent years for high-risk thoracic or abdominal aortic dissections.

[0003] During EVAR surgery, a medical delivery system is used to deliver and release a covered stent to the lesion site. The delivery system includes a catheter assembly and a handle assembly. The catheter assembly comprises a nested inner and outer cannula and is used to load the covered stent. The handle assembly is located proximally to the catheter assembly and controls the axial relative movement of the inner and outer cannulas to release the covered stent. Specifically, during delivery, the covered stent is gripped on the inner cannula, and the outer cannula covers both the inner and outer cannulas. After delivering the covered stent to the lesion site, the handle assembly controls the movement of the outer cannula relative to the inner cannula from distal to proximal, releasing the covered stent. Then, the inner cannula is moved relative to the outer cannula from distal to proximal, retracting it into the outer cannula to prevent components on the inner cannula from snagging the stent or damaging the vessel. Finally, the entire catheter assembly is withdrawn.

[0004] The proximal end of the outer tube is sealed to the outer surface of the inner tube. When controlling the movement of the inner tube relative to the outer tube from distal to proximal, the distance of movement should be controlled to avoid excessive movement that could cause separation of the outer and inner tubes or damage the seal between their outer surfaces. Otherwise, it could lead to significant bleeding and increase surgical risks. Summary of the Invention

[0005] The purpose of this invention is to provide a catheter assembly, a medical delivery device, and a medical system, which aim to improve the safety and stability of surgery.

[0006] To achieve the above objectives, the present invention provides a catheter assembly including an outer tube, an inner tube, and a connecting mechanism. The outer tube is fitted onto a portion of the outer surface of the inner tube and is configured to be axially movable relative to the inner tube. The proximal end of the outer tube is sealed to the outer surface of the inner tube via the connecting mechanism.

[0007] The inner tube includes an inner tube body, and a first limiting part is provided on the outer surface of the inner tube body. The outer diameter of the first limiting part is larger than the outer diameter of the inner tube body, and the first limiting part is disposed in the cavity of the outer tube.

[0008] The connecting mechanism includes a first connecting part and a second connecting part; the first connecting part is disposed at the proximal end of the outer tube; the second connecting part is movably fitted onto the inner tube body and is located on the proximal side of the first limiting part, the second connecting part is connected to the first connecting part, and is also used to abut against the first limiting part when the inner tube moves a predetermined distance relative to the outer tube in the direction from the distal end to the proximal end.

[0009] Optionally, the first connecting portion has an inner hole, which is coaxially arranged with and communicates with the outer tube; the second connecting portion includes a second limiting portion, a sealing element, and a sealing cap arranged sequentially along the axial direction of the inner tube body; the second limiting portion is inserted into the inner hole and is located between the inner surface of the first connecting portion and the outer surface of the inner tube body; the inner diameter of the second limiting portion is smaller than the outer diameter of the first limiting portion, so that the distal end of the second limiting portion can abut against the first limiting portion; the sealing cap is connected to the first connecting portion and presses against the sealing connecting element.

[0010] Optionally, the inner diameter of the second limiting portion gradually increases from the distal end to the proximal end.

[0011] Optionally, the sealing element includes a sealing ring and a sealing gasket, the sealing ring being interference-fitted with the distal end of the inner tube body, and the sealing gasket being disposed on the proximal side of the sealing ring.

[0012] Optionally, the first connecting portion includes a connecting tube and an outer tube; the connecting tube is connected to the proximal end of the outer tube and has an inner hole, the axial length of which is equal to the axial length of the second limiting portion; the outer tube is fitted over the connecting tube; the sealing member further presses against the proximal end face of the connecting tube, the sealing cap is connected to the outer tube, and the conduit assembly is configured such that when the sealing cap is connected to the outer tube, the outer tube and the connecting tube remain axially stationary relative to each other.

[0013] Optionally, the inner surface of the outer sleeve is provided with a limiting groove; the outer surface of the connecting tube is provided with a limiting protrusion, the limiting protrusion is inserted into the limiting groove, and the connecting tube and the outer sleeve remain circumferentially stationary.

[0014] Optionally, the outer sleeve is provided with a snap-fit ​​groove, and the sealing cap is provided with a snap-fit ​​block, the snap-fit ​​block being connected to the snap-fit ​​groove.

[0015] Optionally, the inner tube body includes a first tube segment and a second tube segment, the second tube segment being disposed at the distal end of the first tube segment, and the first limiting portion being located on the distal outer surface of the first tube segment or the proximal outer surface of the second tube segment.

[0016] To achieve the above objectives, the present invention also provides a medical delivery device, including a handle and a catheter assembly as described in any of the preceding claims, the handle being disposed at the proximal end of the catheter assembly, the handle including a grip portion and a drive portion disposed on the grip portion, the drive portion being used to control the inner tube and the outer tube to move axially relative to each other.

[0017] To achieve the above objectives, the present invention also provides a medical system comprising a medical implant and a medical delivery device as described above, wherein the medical implant is loaded in the catheter assembly and the medical delivery device is used to deliver and release the medical implant to a target location in a target lumen.

[0018] Compared with the prior art, the catheter assembly, medical delivery device, and medical system of the present invention have the following advantages:

[0019] First, the aforementioned catheter assembly includes an outer tube, an inner tube, and a connecting mechanism. The outer tube is fitted onto a portion of the outer surface of the inner tube and is configured to move axially relative to the inner tube. The proximal end of the outer tube is sealed to the outer surface of the inner tube via the connecting mechanism. The inner tube includes an inner tube body, and a first limiting portion is provided on the outer surface of the inner tube body. The outer diameter of the first limiting portion is larger than the outer diameter of the inner tube body, and the first limiting portion is disposed within the lumen of the outer tube. The connecting mechanism includes a first connecting portion and a second connecting portion connected to each other. The first connecting portion is disposed at the proximal end of the outer tube, and the second connecting portion is movably fitted onto the inner tube body and located on the proximal side of the first limiting portion. It is also used to abut against the first limiting part when the inner tube moves a predetermined distance relative to the outer tube in a distal-to-proximal direction; the catheter assembly is applied to a medical delivery device for delivering a medical implant to a target position in a target lumen, and then releasing the medical implant by controlling the movement of the outer tube relative to the inner tube in a distal-to-proximal direction; after release, the inner tube is then controlled to move relative to the outer tube in a distal-to-proximal direction so that the distal end of the inner tube is retracted into the outer tube. During this process, when the first limiting part abuts against the second connecting part, it prevents the inner tube from continuing to move relative to the outer tube in a distal-to-proximal direction, thus avoiding the situation where the inner tube separates from the outer tube due to excessive movement.

[0020] Secondly, the first connecting portion has an inner hole, which is coaxially arranged with and communicates with the outer tube. The second connecting portion includes a second limiting portion, a sealing element, and a sealing cap arranged sequentially along the axial direction of the inner tube body. The second limiting portion is inserted into the inner hole and located between the first connecting portion and the inner tube body. The inner diameter of the second limiting portion is smaller than the outer diameter of the first limiting portion, so that the second limiting portion can abut against the first limiting portion. The sealing cap is connected to the first connecting portion and presses the sealing element against the proximal end face of the second limiting portion. In other words, by using the distal end of the second limiting portion to abut against the proximal end of the first limiting portion, excessive movement of the inner tube relative to the outer tube in the direction from the distal end to the proximal end is avoided, which could cause the sealing element to fold and lead to sealing failure. Moreover, the second limiting portion being located between the first connecting portion and the inner tube further improves the sealing effect. Attached Figure Description

[0021] The accompanying drawings are provided to better understand the invention and are not intended to unduly limit the scope of the invention. Wherein:

[0022] Figure 1 This is a schematic diagram of the structure of a medical delivery device according to an embodiment of the present invention, in which the outer tube is not assembled to the outside of the inner tube;

[0023] Figure 2 This is a partial structural schematic diagram of a medical delivery device provided according to an embodiment of the present invention;

[0024] Figure 3 This is a partial structural schematic diagram of the inner tube of a medical delivery device according to an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the structure of the outer tube and the first connecting part at the proximal end of the medical delivery device provided by the present invention according to an embodiment.

[0026] [The annotations in the attached figures are explained below]:

[0027] 10-Conveyor;

[0028] 100-Conduit assembly, 1000-Outer tube, 2000-Inner tube, 2100-Inner tube body, 2110-First tube segment, 2120-Second tube segment, 2200-First limiting part, 2201-Stepped surface, 3000-Connecting mechanism, 3100-First connecting part, 3101-First inner hole, 3110-Connecting tube, 3111-Limiting protrusion, 3112-Distal segment, 3113-Proximal segment, 3120-Outer tube, 3121-Connecting block, 3122-External thread, 3200-Second connecting part, 3210-Second limiting part, 3220-Seal, 3221-Sealing ring, 3222-Sealing gasket, 3230-Sealing cap, 3231-Snap-fit ​​block.

[0029] 200-Handle, 210-Grip, 220-Drive unit, 221-First drive unit, 222-Second drive unit;

[0030] 300-conical head. Detailed Implementation

[0031] The following specific examples illustrate the implementation 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 other different specific embodiments, and 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 illustrations provided in this embodiment are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show components related to the present invention and are not drawn according to the actual number, shape, and size of components in the actual implementation. In the actual implementation, the type, quantity, and proportion of each component can be arbitrarily changed, and the component layout may also be more complex.

[0032] Furthermore, while each embodiment described below possesses one or more technical features, this does not imply that users of the present invention must simultaneously implement all technical features in any embodiment, or can only separately implement some or all technical features in different embodiments. In other words, provided it is feasible, those skilled in the art can, based on the disclosure of the present invention and depending on design specifications or implementation requirements, selectively implement some or all technical features in any embodiment, or selectively implement a combination of some or all technical features in multiple embodiments, thereby increasing the flexibility in implementing the present invention.

[0033] As used herein, the singular forms “a,” “an,” and “the” include plural objects, and the plural form “a plurality” includes two or more objects, unless otherwise expressly indicated. As used herein, the term “or” is generally used to include the meaning of “and / or,” unless otherwise expressly indicated, and the terms “install,” “connect,” and “link” should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection. Connections can be mechanical or electrical. Connections can be direct or indirect through an intermediate medium, and can represent internal communication between two elements or an interaction between two elements. Those skilled in the art will understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0034] In this article, the terms “proximal” and “distal” refer to the relative orientation, position, and direction of the components or movements relative to each other from the perspective of the physician using the medical device. Although “proximal” and “distal” are not restrictive, “proximal” usually refers to the end of the medical device that is closer to the physician during normal operation, while “distal” usually refers to the end that first enters the patient’s body.

[0035] 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 a very simplified form and use non-precise proportions, and are only used to facilitate and clearly illustrate the objectives of the embodiments of the present invention. The same or similar reference numerals in the drawings represent the same or similar parts.

[0036] like Figure 1 As shown, this embodiment of the invention provides a medical delivery device 10, which includes a catheter assembly 100 and a handle 200. The catheter assembly 100 includes an outer tube 1000, an inner tube 2000, and a connecting mechanism 3000. Figure 1 Not shown in the image, please refer to the image. Figure 2 (As indicated). The outer tube 1000 is fitted onto at least a portion of the outer surface of the inner tube 2000, and the outer tube 1000 and the inner tube 2000 are configured to allow axial relative movement. The proximal end of the outer tube 2000 is also sealed to the outer surface of the inner tube 2000 via the connecting mechanism 3000. The handle 200 is connected to the proximal end of the conduit assembly 100 and includes a grip 210 and a drive 220 disposed on the grip 210. The drive 220 is used to control the axial relative movement of the outer tube 1000 and the inner tube 2000.

[0037] The medical delivery device 10 is used to deliver and release a medical implant to a target location within the patient's body. The medical implant includes, but is not limited to, medical stents, artificial heart valves, and embolization springs. Specifically, during delivery, the medical implant is held against the inner tube 2000 and encased by the outer tube 1000. Once the medical implant reaches the target location, the user controls the outer tube 1000 to move distally to proximally relative to the inner tube 2000 via the drive unit 220 to release the medical implant. After release, the user again controls the inner tube 2000 to move distally to proximally relative to the outer tube 1000 via the drive unit 220 to retract the distal end of the inner tube 2000 into the lumen of the outer tube 1000. Finally, the entire catheter assembly 100 is withdrawn from the body. Here, controlling the movement of the outer tube 1000 relative to the inner tube 2000 in the distal-to-proximal direction can include either keeping the inner tube 2000 stationary and moving the outer tube 1000 in the distal-to-proximal direction, or keeping the outer tube 1000 stationary and moving the inner tube 2000 in the proximal-to-distal direction. Controlling the movement of the inner tube 2000 relative to the outer tube 1000 in the distal-to-proximal direction can also include either keeping the inner tube 2000 stationary and moving the outer tube 1000 in the proximal-to-distal direction, or keeping the outer tube 1000 stationary and moving the inner tube 2000 in the distal-to-proximal direction. Hereafter, the movement of the inner tube 2000 relative to the outer tube 1000 in the distal-to-proximal direction will be referred to as retracting the inner tube 2000.

[0038] Those skilled in the art should know that during the retraction of the inner tube 2000, the retraction distance should be controlled to avoid excessive retraction causing the outer tube 1000 to separate from the inner tube 2000 at the distal end of the inner tube 2000 or causing seal failure, resulting in massive bleeding and increasing surgical risks.

[0039] In response to this, such as Figures 2 to 4As shown, in the medical delivery device 10 provided in this embodiment of the invention, the inner tube 2000 may include an inner tube body 2100, and a first limiting portion 2200 is provided on the outer surface of the inner tube body 2100. The outer diameter of the first limiting portion 2200 is larger than the outer diameter of the inner tube body 2100, and the first limiting portion 2200 is disposed in the lumen of the outer tube 1000. The connecting mechanism 3000 includes a first connecting portion 3100 and a second connecting portion 3200 connected to each other, wherein the first connecting portion 3100 is disposed at the proximal end of the outer tube 1000, and the second connecting portion 3200 is movably fitted onto the inner tube body 2100 and located on the proximal side of the first limiting portion 2200. During the retraction of the inner tube 2000, when the inner tube 2000 retracts a predetermined distance, the first limiting part 2200 abuts against the second connecting part 3200, thereby hindering the retraction of the inner tube 2000 and preventing it from continuing to retract. That is, through the cooperation of the second connecting part 3200 and the first limiting part 2200, the maximum distance the inner tube 2000 can move relative to the outer tube 1000 in the direction from the distal end to the proximal end is limited, preventing the inner tube 2000 from separating from the outer tube 1000 at the distal end of the inner tube 2000. It should be noted that the second connecting part 3200 is movably fitted onto the inner tube body 2100, meaning that the second connecting part 3200 can move axially relative to the inner tube 2000.

[0040] The first limiting portion 2200 can extend continuously around the circumference of the inner tube 2100, and a stepped surface 2201 is formed between the outer peripheral surface of the first limiting portion 2200 and the outer peripheral surface of the inner tube 2100. The stepped surface 2201 is used to abut against the second connecting portion 3200. Here, the stepped surface 2201 can be a plane or an arc surface (that is, the stepped surface is rounded when viewed from the axial section of the inner tube 2000).

[0041] Optionally, the inner tube 2100 may include a first tube segment 2110 and a second tube segment 2120, with the second tube segment 2200 connected to the distal end of the first tube segment 2110. Optionally, the first limiting portion 2200 is disposed on the distal outer surface of the first tube segment 2110. Here, the first limiting portion 2200 may be obtained by increasing the wall thickness of the distal portion of the first tube segment 2110. For example, the first tube segment 2110 has a uniform inner diameter over its entire axial length, but the distal portion of the first tube segment 2110 has a greater wall thickness, such that the outer surface of the distal portion of the first tube segment 2110 protrudes beyond the outer surface of its proximal portion to form the first limiting portion 2200. In this implementation, the proximal end face of the second tube segment 2120 may be connected to the distal end face of the first tube segment 2110, for example, the two being an integral structure.

[0042] Alternatively, the first limiting portion 2200 is disposed on the proximal outer surface of the second pipe segment 2220. Specifically, the inner tube 2000 further includes a connecting tube, the proximal end of which is sleeved on the distal outer peripheral surface of the first pipe segment 2210, and the outer diameter of the connecting tube is larger than the outer diameter of the first pipe segment 2210, so that the outer surface of the connecting tube protrudes from the outer surface of the first pipe segment 2210 to form the second limiting portion 2200. The connecting tube is preferably integrally formed with the first pipe segment 2210. The proximal end of the second pipe segment 2220 is inserted into the lumen of the connecting tube and abuts against the distal end face of the first pipe segment 2210, and the outer peripheral surface of the proximal portion of the second pipe segment 2220 is connected to the inner wall of the connecting tube, so that the second pipe segment 2220 is connected to the distal end of the first pipe segment 2210.

[0043] The first connecting portion 3100 has an inner hole, referred to herein as the first inner hole 3101. The first inner hole 3101 is coaxially arranged with the outer tube 1000 and communicates with the lumen of the outer tube 1000, such that a portion of the inner tube 2000 is located within the first inner hole 3101. The second connecting portion 3200 includes a second limiting portion 3210, a sealing element 3220, and a sealing cap 3230 sequentially arranged along the axial direction of the inner tube body 2100. The inner diameter of the second limiting portion 3210 is smaller than the outer diameter of the first limiting portion 2200, and the second limiting portion 3210 is inserted into the first inner hole 3101 so that the second limiting portion 3210 is located between the inner surface of the first connecting portion 3100 and the outer surface of the inner tube body 2100. The sealing cap 3230 is connected to the first connecting portion 3100, and the sealing element 3220 presses against the proximal end face of the second limiting portion 3210. The sealing element 3220 may include a sealing ring 3221 and a sealing gasket 3222. The sealing ring 3221 is interference-fitted with the inner tube body 2100, and the sealing gasket 3222 is disposed on the proximal side of the sealing ring. This structure, on the one hand, utilizes the distal end face of the second limiting portion 3210 to abut against the stepped surface 2201 to prevent the inner tube 2200 from further retracting, avoiding separation of the inner tube 2000 from the outer tube 1000, and also preventing the sealing element 3220 from folding due to excessive retraction of the inner tube 2200, thus preventing sealing failure. On the other hand, the second limiting portion 3210 also fills the space between the first connecting portion 3100 and the inner tube 2200, further improving the sealing effect.

[0044] Preferably, the outer diameter of the second limiting part 3210 gradually increases from the distal end to the proximal end, that is, the second limiting part 3210 is a tapered structure with a cross-section that gradually increases from the distal end to the proximal end, so as to facilitate the insertion of the second limiting part 3210 into the first inner hole 3101 during assembly.

[0045] More preferably, the first connecting part 3100 includes a connecting tube 3110 and an outer tube 3120. Please refer to the following for details. Figure 4The connecting pipe 3110 is connected to the proximal end of the outer pipe 1000. The connecting pipe 3110 includes an axially connected distal section 3112 and a proximal section 3112, the outer diameter of the distal section 3112 being smaller than the outer diameter of the proximal section 3112. The distal section 3112 of the connecting pipe 3110 is sleeved on the proximal outer circumferential surface of the outer pipe 1000, and the inner wall of the distal section 3112 is connected to the proximal outer circumferential surface of the outer pipe 1000, thereby forming the first inner hole 3101 within the inner cavity of the proximal portion 3113 of the connecting pipe 3110. Preferably, the axial length of the first inner hole 3101 is the same as the axial length of the second limiting part 3210. When the second limiting part 3210 is inserted into the first inner hole 3101, the distal end of the second limiting part 3210 abuts against the proximal end face of the outer tube 1000, and the proximal end face of the second limiting part 3210 is flush with the proximal end face of the connecting tube 3110. In this way, the sealing member 3220 can also press against the proximal end face of the connecting tube 3110.

[0046] The outer sleeve 3120 is fitted onto the outer surface of the connecting tube 3110 and connected to the sealing cap 3230. Optionally, a connecting block 3121 is provided on the proximal end face of the outer sleeve 3120, and a snap-fit ​​groove (not shown in the figure) is formed between the connecting block 3121 and the proximal end face of the outer sleeve 3120. A snap-fit ​​block 3231 is provided on the outer peripheral surface of the sealing cap 3230, and the snap-fit ​​block 3231 snaps into the snap-fit ​​groove.

[0047] It is understood that, at least when the sealing cap 3230 is connected to the outer sleeve 3120, the outer sleeve 3120 and the connecting pipe 3110 remain axially stationary. For example, in some implementations, the outer sleeve 3120 is fixedly connected to the outer surface of the connecting pipe 3110, such that the outer sleeve 3120 always remains axially stationary with respect to the connecting pipe 3110. In other embodiments, the outer sleeve 3120 is detachably fitted onto the outer surface of the connecting tube 3110. Specifically, the outer sleeve 3120 has a second inner hole (not shown in the figure) to accommodate the connecting tube 3110. The diameter of the second inner hole matches the outer diameter of the connecting tube 3110. That is, the second inner hole may include a distal section and a proximal section. The diameter of the distal section matches the outer diameter of the distal section 3112 of the connecting tube 3110, and the diameter of the proximal section matches the outer diameter of the proximal section 3113 of the connecting tube 3110. When the sealing cap 3230 is connected to the outer sleeve 3120, the junction of the distal section and the proximal section facilitates the proximal section 3113 of the connecting tube 3110 to abut against it, so that the outer sleeve 3120 and the connecting tube 3110 remain axially relatively stationary. In addition, the axial length of the proximal end hole segment can be less than the sum of the axial length of the proximal end segment 3113 and the thickness of the seal 3220. Thus, the proximal end of the seal 3220 can protrude from the proximal end face of the outer sleeve 3120. When the sealing cap 3230 is connected to the outer sleeve 3110, the sealing cap presses against the seal 3220.

[0048] The outer tube 3120 is also used to connect with the drive unit 220. Specifically, the drive unit 220 includes a first drive unit 221 and a second drive unit 222. The first drive unit 221 is used to connect with the outer tube 3120 and control the movement of the outer tube 1000 by controlling the movement of the outer tube 3120. The second drive unit 222 is used to connect with the inner tube 2000 and control the movement of the inner tube 2000.

[0049] Optionally, the outer sleeve 3120 and the connecting pipe 3110 remain relatively stationary in the circumferential direction. When the outer sleeve 3120 is directly fixed to the connecting pipe 3110, the outer sleeve 3120 and the connecting pipe 3110 naturally remain relatively stationary in the circumferential direction. When the outer sleeve 3120 is detachably sleeved on the outer surface of the connecting pipe 3110, a limiting groove (not shown in the figure) is provided on the inner surface of the outer sleeve 3120. The limiting groove is, for example, provided on the hole wall of the distal hole segment, and the proximal end of the limiting groove is open. A limiting protrusion 3111 is provided on the outer surface of the connecting pipe 3110. The proximal end of the limiting protrusion 3111 is connected to the distal end of the proximal segment 3113. The limiting protrusion 3111 is inserted into the limiting groove, so that the connecting pipe 3110 and the outer sleeve 3120 remain relatively stationary in the circumferential direction. An external thread 3122 is also provided on the outer surface of the outer sleeve 3120. The first drive unit 221 is a manual drive mechanism configured to rotate relative to the gripping part 210. The first drive unit 221 has an internal thread (not shown in the figure), which engages with the external thread 3122 on the outer sleeve 3120 for threaded transmission. When the first drive unit 221 rotates, it drives the outer sleeve 3120 and the connecting pipe 3110 to move axially relative to the inner tube 2000, thereby driving the outer tube 1000 to move axially relative to the inner tube 2000.

[0050] The second drive unit 222 and the inner tube 2000 can be connected in any suitable way according to the specific drive method, which will not be described here.

[0051] Optionally, the medical delivery device 10 further includes a conical head 300 connected to the distal end of the inner tube 2000.

[0052] Furthermore, this embodiment of the invention also provides a catheter assembly, which is the aforementioned catheter assembly 100.

[0053] Furthermore, embodiments of the present invention also provide a medical system comprising a medical implant and a medical delivery device 10 as described above, the medical implant being loaded in the catheter assembly 100, and the medical delivery device 10 being used to deliver and release the medical implant to a target location in a target lumen.

[0054] While the present invention has been disclosed above, it is not limited thereto. Those skilled in the art can make various modifications and variations to the present invention without departing from its spirit and scope. Therefore, if such modifications and variations fall within the scope of the claims and their equivalents, the present invention also intends to include such modifications and variations.

Claims

1. A catheter assembly, characterized in that, The device includes an outer tube, an inner tube, and a connecting mechanism. The outer tube is fitted onto a portion of the outer surface of the inner tube and is configured to move axially relative to the inner tube. The proximal end of the outer tube is sealed to the outer surface of the inner tube via the connecting mechanism. The inner tube includes an inner tube body, and a first limiting part is provided on the outer surface of the inner tube body. The outer diameter of the first limiting part is larger than the outer diameter of the inner tube body, and the first limiting part is disposed in the cavity of the outer tube. The connecting mechanism includes a first connecting part and a second connecting part; the first connecting part is disposed at the proximal end of the outer tube; the second connecting part is movably fitted onto the inner tube body and is located on the proximal side of the first limiting part. The second connecting part is connected to the first connecting part and is also used to abut against the first limiting part when the inner tube moves a predetermined distance relative to the outer tube in the direction from the distal end to the proximal end, and to prevent the inner tube from continuing to move relative to the outer tube in the direction from the distal end to the proximal end. The first connecting portion has an inner hole, which is coaxially arranged with and communicates with the outer tube; the second connecting portion includes a second limiting portion, a sealing element, and a sealing cap arranged sequentially along the axial direction of the inner tube body; the second limiting portion is inserted into the inner hole and is located between the inner surface of the first connecting portion and the outer surface of the inner tube body; the inner diameter of the second limiting portion is smaller than the outer diameter of the first limiting portion, so that the distal end of the second limiting portion can abut against the first limiting portion; the sealing cap is connected to the first connecting portion and presses against the sealing element.

2. The catheter assembly according to claim 1, characterized in that, The inner diameter of the second limiting part gradually increases from the distal end to the proximal end.

3. The catheter assembly according to claim 1, characterized in that, The sealing element includes a sealing ring and a sealing gasket. The sealing ring is interference-fitted with the distal end of the inner tube body, and the sealing gasket is disposed on the proximal side of the sealing ring.

4. The catheter assembly according to claim 1, characterized in that, The first connecting part includes a connecting tube and an outer tube; the connecting tube is connected to the proximal end of the outer tube and has the inner hole, the axial length of the inner hole being equal to the axial length of the second limiting part; the outer tube is fitted over the outside of the connecting tube; the sealing member also presses against the proximal end face of the connecting tube, the sealing cap is connected to the outer tube, and the conduit assembly is configured such that when the sealing cap is connected to the outer tube, the outer tube and the connecting tube remain axially stationary relative to each other.

5. The catheter assembly according to claim 4, characterized in that, The inner surface of the outer sleeve is provided with a limiting groove; the outer surface of the connecting tube is provided with a limiting protrusion. The limiting protrusion is inserted into the limiting groove, so that the connecting tube and the outer sleeve remain circumferentially stationary.

6. The catheter assembly according to claim 4, characterized in that, The outer tube is provided with a snap-fit ​​groove, and the sealing cover is provided with a snap-fit ​​block, which is connected to the snap-fit ​​groove.

7. The catheter assembly according to claim 1, characterized in that, The inner tube body includes a first tube segment and a second tube segment, the second tube segment being disposed at the distal end of the first tube segment, and the first limiting part being located on the distal outer surface of the first tube segment or the proximal outer surface of the second tube segment.

8. A medical delivery device, characterized in that, The device includes a handle and a catheter assembly as described in any one of claims 1-7, the handle being disposed at the proximal end of the catheter assembly, the handle including a grip portion and a drive portion disposed on the grip portion, the drive portion being used to control the inner tube and the outer tube to move axially relative to each other.

9. A medical system, characterized in that, The device includes a medical implant and a medical delivery device as described in claim 8, wherein the medical implant is loaded in the catheter assembly and the medical delivery device is used to deliver and release the medical implant to a target location in a target lumen.

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