CN116636900A

CN116636900A - Clamping device

Info

Publication number: CN116636900A
Application number: CN202310482700.8A
Authority: CN
Inventors: 张承; 姚锋
Original assignee: Hangzhou Anjisi Medical Science And Technology Co ltd
Current assignee: Hangzhou Anjisi Medical Science And Technology Co ltd
Priority date: 2022-04-29
Filing date: 2023-04-28
Publication date: 2023-08-25

Abstract

The embodiment of the specification provides a clamping device. The clamping device comprises: a clip portion including a receiving tube and a clip arm; the conveying part comprises a sheath tube and a mandrel moving in the sheath tube channel, a connecting end head is arranged at the distal end of the mandrel, the connecting end head is in releasable connection with the clamping arm, and the distal end of the sheath tube is in releasable connection with the storage tube; the storage tube is provided with a first connecting part, and the conveying part is provided with a second connecting part; when the connecting end head enters the far end of the second connecting part, the second connecting part expands outwards in the radial direction, the second connecting part is connected with the first connecting part, and the clip part is connected with the sheath tube; when the connecting end head exits from the distal end of the second connecting portion, the second connecting portion contracts radially inwards, the second connecting portion and the first connecting portion are released, and the clip portion and the sheath tube are separated.

Description

Clamping device

Cross reference

The present application claims priority from chinese patent application 202210465401.9 entitled "a gripping device" filed on 29 and 04 and 2022, the entire contents of which are incorporated herein by reference.

Technical Field

The present disclosure relates to the field of medical devices, and in particular, to a clamping device.

Background

At present, in minimally invasive surgery, a clamping device such as a hemostatic clamp and a ligature clamp is usually used under an endoscope, and the clamping device clamps human tissues so as to achieve the hemostatic and ligature effects. The clamping device comprises a clamp part and a conveying part, wherein the conveying part conveys the clamp part to the human tissue for operation, and the clamp part is required to be remained at the human tissue for hemostasis or ligation. However, in order to maintain the operation stability of the clip portion, the connection structure of the clip portion and the conveying portion is complicated, and there is a risk of being difficult to separate. Therefore, it is necessary to provide a gripping device which is stable in operation and in which the clip portion is easily disengaged from the conveying portion.

Disclosure of Invention

One of the embodiments of the present specification provides a clamping device, including: a clip portion including a receiving tube and a clip arm; the conveying part comprises a sheath tube and a mandrel moving in the sheath tube channel, a connecting end head is arranged at the distal end of the mandrel, the connecting end head is in releasable connection with the clamping arm, and the distal end of the sheath tube is in releasable connection with the storage tube; the storage tube is provided with a first connecting part, and the conveying part is provided with a second connecting part; when the connecting end head enters the far end of the second connecting part, the second connecting part expands outwards in the radial direction, the second connecting part is connected with the first connecting part, and the clip part is connected with the sheath tube; when the connecting end head exits from the distal end of the second connecting portion, the second connecting portion contracts radially inwards, the second connecting portion and the first connecting portion are released, and the clip portion and the sheath tube are separated.

In some embodiments, the second connection portion includes a connection structure and a securing portion, at least a portion of the second connection portion is disposed within the sheath, and at least another portion of the second connection portion extends beyond the distal end of the sheath.

In some embodiments, the outer diameter of the fixation portion is the same or substantially the same as the inner diameter of the proximal end of the receiving tube.

In some embodiments, the connection structure includes oppositely disposed snaps including a resilient arm and a stop tab disposed at a distal end of the resilient arm that extends radially outward.

In some embodiments, the first connection portion includes a limit recess disposed at the proximal end of the receiving tube for limit mating with the second connection portion.

In some embodiments, the limit projection extends into the limit recess when the connection tip enters the distal end of the second connection portion; when the connecting end head exits from the far end of the second connecting part, the limiting convex part is separated from the limiting concave part.

In some embodiments, the limiting recess is integrally formed with the receiving tube; or, spacing concave with accomodate the pipe and be split type structure, spacing concave is fixed accomodate the inside of pipe.

In some embodiments, the spacing between the distal ends of the resilient arms is less than the outer diameter of the connection tip, which is less than the inner diameter of the fixation section.

In some embodiments, the fixing portion includes a connection hole, and the position of the limit protrusion corresponds to the connection hole and is movable in a radial direction with respect to the connection hole.

In some embodiments, the side wall of the fixing portion is formed with a slot, the proximal end of the elastic arm is connected to the proximal end of the slot, and the distal end of the elastic arm extends obliquely inward with respect to the slot.

In some embodiments, the second connecting portion includes a positioning structure disposed at a proximal end of the second connecting portion, the positioning structure being disposed around a circumferential side of the connecting tip and limiting a radial degree of freedom of the connecting tip when the connecting tip enters the second connecting portion.

In some embodiments, the second connection portion includes a stop structure for forming a stop fit with the sheath to limit displacement of the second connection portion in the axial direction of the sheath.

In some embodiments, the stop structure includes a radially protruding stop or a circumferentially disposed boss.

In some embodiments, the receiving tube includes a locking portion and the clip arm includes a locking mating portion, the clip arm being relatively fixed with the receiving tube when the locking portion is mated with the locking mating portion.

In some embodiments, the locking portion comprises a spring, a distal end of the spring is connected to the receiving tube, and a proximal end of the spring extends into the receiving tube.

In some embodiments, the clip arm includes a first clip piece, a second clip piece, and a connecting pin, the first clip piece and the second clip piece are connected by the connecting pin, one end of the connecting pin forms the locking mating portion, or both ends of the connecting pin form the locking mating portion.

In some embodiments, a first bending part bending towards the second clamping piece is arranged at one end of the first clamping piece, which is close to the connecting pin, and a first hole is formed in the first bending part; the second clamping piece is provided with a second bending part which is bent towards the first clamping piece at one end close to the connecting pin, and the second bending part is provided with a second hole; at least a portion of the first aperture and the second aperture overlap.

In some embodiments, the mandrel includes a large diameter portion and a small diameter portion, the small diameter portion being fixedly connected to the connection head, the large diameter portion being fixedly connected to the small diameter portion, the large diameter portion having a diameter greater than a diameter of the small diameter portion.

At least part of the first hole and the second hole are overlapped and communicated to form a sleeve joint hole; the diameter of the large diameter part is larger than the inner diameter of the sleeve joint hole, and the diameter of the small diameter part is smaller than the inner diameter of the sleeve joint hole.

A second embodiment of the present disclosure provides a clamping device, including: a clip portion including a receiving tube and a clip arm; the conveying part comprises a sheath tube and a mandrel moving in the sheath tube channel, a connecting end head is arranged at the distal end of the mandrel, the connecting end head is in releasable connection with the clamping arm, and the distal end of the sheath tube is in releasable connection with the storage tube; the storage tube is provided with a first connecting part, and the conveying part is provided with a second connecting part; when the second connecting part enters the position of the first connecting part in the storage tube, the second connecting part expands outwards in a natural state, the second connecting part is connected with the first connecting part, and the clip part is connected with the conveying part; when the connecting end head is withdrawn from the storage tube from the far end to the near end, the second connecting part is driven to move towards the near end, the second connecting part and the first connecting part are released, and the clip part and the conveying part are separated.

In some embodiments, the receiving tube includes a abutment distal to the first connection portion, the abutment to limit displacement of the clip arm distally along an axis of the receiving tube.

In some embodiments, the second connecting portion is provided with a limiting piece, a proximal end of the limiting piece is connected with the second connecting portion, a distal end of the limiting piece extends into the second connecting portion, the connecting end is provided with an abutting portion, and when the connecting end is withdrawn from the storage tube from the distal end to the proximal end, the abutting portion and the limiting piece abut against and then drive the second connecting portion to move towards the proximal end.

In some embodiments, the second connecting portion includes a connecting structure and a fixing portion, a proximal end of the connecting structure is connected with the fixing portion, the connecting structure includes a buckle, and the buckle includes a resilient arm and a limiting protrusion disposed at a distal end of the resilient arm and extending radially outward.

In some embodiments, the outer side of the limit projection is disposed obliquely and the outer side is at least partially radially outward.

In some embodiments, the delivery portion further comprises an elastic member, the distal end of the sheath comprises a receiving section, the elastic member is disposed in the receiving section, the proximal end of the receiving section comprises a blocking portion, the proximal end of the elastic member abuts against the blocking portion, and the proximal end of the second connecting portion is disposed in the receiving section in a sleeved manner and abuts against the distal end of the elastic member.

In some embodiments, the elastic member has a first elastic force when the second connection portion is connected to the first connection portion, and has a second elastic force when the second connection portion and the first connection portion are released, the second elastic force being greater than the first elastic force.

In some embodiments, the sheath includes a stop table disposed inboard of the distal end of the sheath, the distal end of the stop table configured to abut the proximal end of the receiving tube.

In some embodiments, the inner diameter of the stop block is less than or equal to the inner diameter of the proximal end of the receiving tube, the proximal end of the stop block being provided with a bevel, the bevel increasing the distal end of the stop block from the distal to the proximal inner diameter.

In some embodiments, the proximal end of the stop block is provided with an annular groove, and the second connecting portion includes a boss that, after abutting the annular groove, limits movement of the second connecting portion toward the proximal end.

According to the clamping device in the embodiment, the first connecting part of the storage tube and the second connecting part of the conveying part can be detachably matched with each other, so that the clamp part is kept at the focus to stop bleeding or ligature conveniently. When the connecting end enters the far end of the second connecting part, the second connecting part expands outwards in the radial direction, and when the connecting end exits the far end of the second connecting part, the second connecting part contracts inwards in the radial direction, namely, the second connecting part can be operated through the entering and exiting of the connecting end, so that the second connecting part is matched with and separated from the first connecting part through the radial expansion and contraction, the operation is convenient and stable, the structure is simple, and the second connecting part is easy to separate from the first connecting part.

Drawings

The present specification will be further elucidated by way of example embodiments, which will be described in detail by means of the accompanying drawings. The embodiments are not limiting, in which like numerals represent like structures, wherein:

FIG. 1 is an overall block diagram of a clamping device according to some embodiments of the present disclosure;

FIG. 2 is a cross-sectional view of a clip portion shown according to some embodiments of the present disclosure;

FIG. 3 is a cross-sectional view of a distal end of a delivery portion according to some embodiments of the present disclosure;

FIG. 4 is an overall block diagram of a second connection shown in accordance with some embodiments of the present description;

FIG. 5 is an axial cross-sectional view of a second connection shown according to some embodiments of the present disclosure;

FIG. 6 is an overall block diagram of a second connection portion according to other embodiments of the present disclosure;

FIG. 7 is an axial cross-sectional view of a second connection portion according to other embodiments of the present disclosure;

FIG. 8 is a schematic view of a delivery portion and clip portion according to some embodiments of the present disclosure;

FIG. 9 is an enlarged partial schematic view of a delivery portion and a clip portion according to some embodiments of the present disclosure;

FIG. 10 is a block diagram of a clip portion shown according to some embodiments of the present disclosure;

FIG. 11 is a cross-sectional view of a clip portion shown according to some embodiments of the present disclosure;

FIG. 12 is a schematic illustration of ligation shown in accordance with some embodiments of the present disclosure;

FIG. 13 is a schematic illustration of a ligation shown in accordance with some embodiments of the disclosure;

FIG. 14 is a schematic representation of a ligation shown in accordance with some embodiments of the disclosure;

FIG. 15 is a schematic view showing the overall structure of the conveying section and the clip section according to other embodiments of the present specification;

FIG. 16 is a schematic view of a second connection portion according to other embodiments of the present disclosure;

FIG. 17 is a schematic view of a receiving tube according to other embodiments of the present disclosure;

FIG. 18 is a cross-sectional view of the second connection portion shown in FIG. 16;

fig. 19 is a schematic structural view of a second connecting portion according to other embodiments of the present specification;

FIG. 20 is a schematic view of a second connection portion according to other embodiments of the present disclosure;

FIG. 21 is a schematic view showing a ligating state according to other embodiments of the present specification;

fig. 22 is a schematic structural view of a conveying section according to other embodiments of the present specification.

Wherein, the reference numerals are as follows: 10. a clamping device; 11. a clip portion; 12. a conveying section; 100. a storage tube; 110. a first connection portion; 120. limiting concave; 130. a locking part; 131. a spring plate; 140. a resisting part; 141. an elastic sheet; 142. a bending structure; 200. a clamp arm; 210. a first clip; 211. a first bending part; 212. a first hole; 220. a second clip; 221. a second bending part; 222. a second hole; 230. a connecting pin; 231. a locking mating part; 240. a socket hole; 250. an elastic ring; 300. a sheath; 310. an annular groove; 320. a receiving section; 330. a blocking portion; 340. a limiting table; 341. an inclined plane; 350. a cladding section; 400. a mandrel; 410. a connecting end; 411. an abutting portion; 420. a large diameter portion; 430. a small diameter portion; 440. an elastic member; 500. a second connecting portion; 510. a connection structure; 511. a positioning structure; 520. a fixing part; 521. a connection hole; 522. slotting; 530. a buckle; 531. an elastic arm; 532. a limit protrusion; 540. a boss; 541. a protrusion; 542. a connecting arm; 550. a limiting block; 560. avoidance holes; 570. a limiting piece; 580. a tie ring; 600. an end cap; 610. a cylindrical side wall; 620. a flange; 700. a handle; 800. a sliding part; 900. organization.

Detailed Description

In order to more clearly illustrate the technical solutions of the embodiments of the present specification, the drawings that are required to be used in the description of the embodiments will be briefly described below. It is apparent that the drawings in the following description are only some examples or embodiments of the present specification, and it is possible for those of ordinary skill in the art to apply the present specification to other similar situations according to the drawings without inventive effort. Unless otherwise apparent from the context of the language or otherwise specified, like reference numerals in the figures refer to like structures or operations.

It will be appreciated that "system," "apparatus," "unit" and/or "module" as used herein is one method for distinguishing between different components, elements, parts, portions or assemblies at different levels. However, if other words can achieve the same purpose, the words can be replaced by other expressions.

As used in this specification and the claims, the terms "a," "an," "the," and/or "the" are not specific to a singular, but may include a plurality, unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that the steps and elements are explicitly identified, and they do not constitute an exclusive list, as other steps or elements may be included in a method or apparatus.

The present embodiments provide a clamping device that may be used to perform a corresponding surgical procedure in minimally invasive surgery, such as hemostasis, ligation, and the like. In some embodiments, the gripping device may include a clip portion and a delivery portion. For example, the clip portion may be used to clamp human tissue to achieve hemostasis, ligation, and the delivery portion may be used to deliver the clip portion to a lesion in a patient and to leave the clip portion at the lesion to maintain hemostasis or ligation at the lesion. The clamp part and the conveying part of the clamping device in the embodiment of the specification are of a detachable structure, the clamp part can be used once, and the conveying part can be reused, so that the cost is saved.

Fig. 1 is an overall block diagram of a clamping device according to some embodiments of the present disclosure. FIG. 2 is a cross-sectional view of a clip portion shown according to some embodiments of the present disclosure; fig. 3 is a cross-sectional view of a distal end of a delivery portion according to some embodiments of the present disclosure.

As shown in fig. 1 to 3, the gripping device 10 may include a clip portion 11 and a conveying portion 12. The clip portion 11 may be a medical instrument that performs a clamping operation, such as a hemostatic clip, a ligating clip, or the like; the delivery unit 12 may be a medical device that delivers the clip unit 11 to a target area, which may be a lesion area, a test area, or the like.

In some embodiments, delivery portion 12 includes a handle 700, a sliding portion 800, a sheath 300, and a mandrel 400, mandrel 400 being disposed within the channel of sheath 300, the proximal end of mandrel 400 being coupled to sliding portion 800, the proximal end of sheath 300 being coupled to handle 700. The sliding portion 800 may slide over the handle 700, thereby moving the mandrel 400 proximally or distally within the sheath 300. In some embodiments, the handle 700, the sliding portion 800, and the mandrel 400 comprise the operating portion of the delivery portion 12. In some embodiments, sheath 300 and its interior space comprise the delivery tube of delivery portion 12.

In some embodiments, clip portion 11 includes a receiving tube 100 and a clip arm 200, the clip arm 200 being movable proximally or distally relative to the receiving tube 100. The distal end of the sheath 300 is releasably connected to the proximal end of the receiving tube 100 such that the clip portion 11 and the delivery portion 12 are connected or disconnected.

In some embodiments, the receiving tube 100 is provided with a first connection portion 110 and the delivery portion 12 is provided with a second connection portion 500. When it is desired to connect the clip portion 11 and the conveying portion 12, the second connection portion 500 may at least partially enter the storage tube 100 and be connected with the first connection portion 110 in the storage tube 100. In some embodiments, the distal end of the mandrel 400 is provided with a connection tip 410, wherein the connection tip 410 may connect the first connection portion 110 and the second connection portion 500 when entering the receiving tube 110 from the sheath 300, and wherein the connection tip 410 may disconnect the first connection portion 110 and the second connection portion 500 when exiting the receiving tube 110 from the sheath 300. Specifically, when the connecting tip 410 enters the distal end of the second connecting portion 500, the second connecting portion 500 expands radially outwards, so that the second connecting portion 500 and the first connecting portion 110 are connected, and the clip portion 11 and the delivery portion 12 are connected; when coupling tip 410 is withdrawn from the distal end of second coupling portion 500, second coupling portion 500 is contracted radially inward, second coupling portion 500 and first coupling portion 110 are released, and clip portion 11 and delivery portion 12 are separated.

It should be noted that, the "proximal end" and "distal end" referred to in the embodiments of the present disclosure may refer to directions along the length direction of the holding device 10 (because the clip portion 11 is to be sent into the human body to perform hemostasis or ligation by the delivery portion 12), or directions along which the holding device 10 enters the human body, where the direction toward the side where the operator is located is "proximal end" and the direction toward the side where the treatment is performed is "distal end"; in addition, "proximal" and "distal" should not be understood to mean only ends, but also at least portions of the segments in this orientation.

According to the clip device 10 in the above-described embodiment, the receiving tube 100 is detachably coupled with the delivery portion 12 by the first connecting portion 110 of the receiving tube 100 and the second connecting portion 500 of the delivery portion 12, so that the clip portion 11 is left at the lesion to maintain hemostasis or ligation. When the connection tip 410 enters the distal end of the second connection part 500, the second connection part 500 expands radially outwards, and when the connection tip 410 exits the distal end of the second connection part 500, the second connection part 500 contracts radially inwards, that is, the second connection part 500 can be operated by the entry and exit of the connection tip 410, so that the second connection part 500 is matched with and separated from the first connection part 110 by expanding and contracting radially, the operation is convenient and stable, the structure is simple, and the second connection part 500 is easy to separate from the first connection part 110.

As shown in fig. 3, the second connection part 500 includes a connection structure 510 and a fixing part 520, at least a portion of the second connection part 500 is disposed in the sheath 300, and at least another portion of the second connection part 500 protrudes from the distal end of the sheath 300. In some embodiments, at least a portion of the second connection 500 disposed within the sheath 300 may be part of the connection structure 510, or at least a portion of the second connection 500 disposed within the sheath 300 may be part of the fixation portion 520, or at least a portion of the second connection 500 disposed within the sheath 300 may also include both the connection structure 510 and a portion of the fixation portion 520. In some embodiments, a portion of the securing portion 520 is coupled to the sheath 300, another portion of the securing portion 520 extends distally from the sheath 300, and a portion of the securing portion 520 extending distally from the sheath 300 is capable of entering the receiving tube 100 and interfacing with the first coupling portion 110.

In some embodiments, the outer diameter of the securing portion 520 is the same or approximately the same as the inner diameter of the proximal end of the receiving tube 100 to facilitate insertion of the securing portion 520 into the interior of the proximal end of the receiving tube 100 for mating. The difference between the outer diameter of the fixing portion 520 and the inner diameter of the proximal end of the receiving tube 100 may be approximately equal to or in the range of 0 to 5%. In some embodiments, the outer diameter of the securing portion 520 is 0-0.5 mm, such as 0.1mm, 0.3mm, 0.4mm, 0.5mm, etc., less than the inner diameter of the proximal end of the receiving tube 100.

As shown in fig. 2, in some embodiments, the first connection portion 110 includes a limit recess 120 disposed at the proximal end of the receiving tube 100, the limit recess 120 being adapted to mate with the second connection portion 500. In some embodiments, the limiting recess 120 and the receiving tube 100 may be integrally formed. For example, the limit recess 120 may be a blind hole, a through hole, or a groove opened on a sidewall of the receiving tube 100. In some embodiments, a step protruding toward the central axis of the receiving tube 100 is provided on the inner wall of the receiving tube 100, and a limit recess 120 may be formed between the step and the inner wall of the receiving tube 100. In some embodiments, the limiting recess 120 and the receiving tube 100 are of a split structure, and the limiting recess 120 is fixed inside the receiving tube 100. For example, the limiting recess 120 may be a limiting ring or an annular groove, and is fixedly connected to the inner wall of the storage tube 100 by a clamping, bonding, or the like. Because the size of the storage tube 100 is smaller, the limiting recess 120 and the storage tube 100 are designed to be of a split structure, so that the processing difficulty can be reduced, the qualification rate of the processing of the storage tube 100 can be improved, and the production cost can be reduced.

In some embodiments, referring to fig. 3, the second connection portion includes a limit protrusion 532, and the limit protrusion 532 may extend into or withdraw from the limit recess 120, wherein the limit recess 120 corresponds in position to the limit protrusion 532 and is capable of limiting each other. In some embodiments, when coupling tip 410 is advanced into the distal end of second coupling portion 500, stop tab 532 extends into stop recess 120, allowing coupling between clip portion 11 and delivery portion 12. In some embodiments, when coupling tip 410 is withdrawn from the distal end of second coupling portion 500, stop tab 532 is separated from stop recess 120, at which point clip portion 11 and delivery portion 12 are separated from one another. The specific structure of the second connecting portion 500 and the specific process of connecting the clip portion 11 and the conveying portion 12 can be referred to as related description elsewhere in this specification (for example, fig. 4 to 9).

As shown in fig. 2, the storage tube 100 further includes a locking part 130, and the clip arm 200 includes a locking engagement part 231, and when the locking part 130 is engaged with the locking engagement part 231, the clip arm 200 may be relatively fixed with the storage tube 100 to maintain an operation position or an operation state of the clip arm 200, for example, to maintain the clip arm 200 in a clamped state.

It should be noted that, the locking matching portion 231 may be a separate structure on the clip arm 200 and fixedly connected with other structures on the clip arm 200 to complete the matching with the locking portion 130, so as to achieve the relative fixation of the clip arm 200 and the storage tube 100. Alternatively, the locking engagement portion 231 may be one structure of the clip arm 200, and may play other roles in the clip arm 200 in addition to achieving the relative fixation of the clip arm 200 and the storage tube 100, for example, the locking engagement portion 231 may be used to connect two clips of the clip arm 200.

In some embodiments, the locking portion 130 includes a spring 131, a distal end of the spring 131 is connected to the receiving tube 100, and a proximal end of the spring 131 extends into the receiving tube 100. In some embodiments, the receiving tube 100 is a one-piece tube, and the elastic sheet 131 may be disposed on the receiving tube 100. In some embodiments, the distal end of the elastic piece 131 is fixedly connected to the side wall of the receiving tube 100, and the proximal end of the elastic piece 131 extends into the channel of the receiving tube 100. It is understood that the passage of the receiving tube 100 is an inner space of the receiving tube 100. In some embodiments, the locking portion 130 may be integrally formed with the receiving tube 100. For example, the elastic pieces 131 may be laser-cut on the side wall of the receiving tube 100, which requires a certain elasticity of the material of the receiving tube 100. In some embodiments, the locking portion 130 and the receiving tube 100 may be designed separately, for example, a slot hole capable of accommodating the elastic piece 131 may be cut in a side wall of the receiving tube 100, and then a distal end of the elastic piece 131 is fixed at an edge of the slot hole by cementing, welding, and fastening, while a proximal end of the elastic piece 131 is in a free state, so that the elastic piece 131 can extend into a channel of the receiving tube 100.

In some embodiments, the receiving tube 100 includes an outer tube and an inner tube (not shown in the drawings), the outer tube is provided with a spring 131, the inner tube and the outer tube are each provided with a channel, the channels of the inner tube and the outer tube are communicated to form a channel of the receiving tube 100, the spring 131 extends at least partially into the channel of the receiving tube 100, and a portion of the spring 131 extending into the channel of the receiving tube 100 forms the locking portion 130. In some embodiments, both ends of the connection pin 230 (connection pin 230 will be described later) of the clip arm 200 constitute a locking engagement portion 231, and the elastic pieces 131 are two, corresponding to the two locking engagement portions 231, respectively, and the locking engagement portion 231 is used to lock the axial positional relationship of the clip arm 200 and the storage tube 100, preventing the clip arm 200 from moving from the distal end of the storage tube 100 to be opened. For more details regarding the clip arm 200, see fig. 10 and 11 and their associated description.

In some embodiments, the clip arm 200 may enter the channel of the storage tube 100 from the distal end of the storage tube 100, when the locking engagement portion 231 is located at the distal end of the locking portion 130, the clip arm 200 may move toward the proximal end of the storage tube 100, when the clip arm 200 moves from the distal end toward the proximal end, the clip arm 200 may be gradually closed under the pressing of the storage tube 100, when the clip arm 200 moves to the locking portion 130 or the vicinity of the locking portion 130, the locking engagement portion 231 presses the locking portion 130 outward, the elastic sheet 131 may deform, so that the locking portion 130 is moved outward away from the locking engagement portion 231, the locking engagement portion 231 moves to the proximal end of the locking portion 130 through the locking portion 130, at this time, the clip arm 200 is closed, the locking portion 130 is located at the distal end of the locking engagement portion 231, the locking portion 130 springs back, the locking portion 130 extends into the storage tube 100, the locking portion 130 is located on the path of the distal movement of the locking engagement portion 231, the distal movement of the locking engagement portion 231 is blocked, and thus the clip arm 200 is locked by the locking engagement portion 231 and the locking portion 130 is prevented from moving toward the distal end, and the clip arm 200 cannot be retracted to the distal end of the locking portion 130 and the clip arm 200 is prevented from being opened again, and the structure is simply closed. Wherein, the resilience of the elastic sheet 131 is as follows: the locking portion 130 can be avoided when the locking matching portion 231 is extruded, after the locking matching portion 231 passes over the locking portion 130, the elastic piece 131 can rebound to block the locking matching portion 231, the elastic piece 131 is not necessarily made of elastic materials, in fact, the elastic piece 131 can be made of any material, preferably, the material of the elastic piece 131 is the same as that of the storage tube 100, the elastic piece 131 is a part of the side wall of the storage tube 100 cut, the far end of the elastic piece 131 is connected with the side wall of the storage tube 100, and the near end of the elastic piece 131 stretches into a channel of the storage tube 100.

Fig. 4 is an overall structural view of the second connection part 500 according to some embodiments of the present description; FIG. 5 is an axial cross-sectional view of a second connection 500 shown in accordance with some embodiments of the present description; fig. 6 is an overall structural view of a second connection part 500 according to other embodiments of the present specification; FIG. 7 is an axial cross-sectional view of a second connection 500 according to other embodiments of the present disclosure; fig. 8 is a schematic structural view of the conveying portion 12 and the clip portion 11 shown in some embodiments of the present specification; fig. 9 is an enlarged partial schematic view of a delivery portion and a clip portion according to some embodiments of the present disclosure. The specific structures of the connection structure 510 and the fixing portion 520 of the second connection portion 500 are described below with reference to fig. 4 to 9.

In some embodiments, the connection structure 510 includes oppositely disposed snaps 530, the snaps 530 being capable of forming a positive fit with the storage tube 100. In some embodiments, catch 530 includes a resilient arm 531 and a radially outwardly extending stop tab 532 provided at a distal end of resilient arm 531. The proximal ends of the elastic arms 531 are fixed to the connection structure 510 or the fixing portion 520, and the distal ends extend obliquely inward with respect to the axial direction of the fixing portion 520, and the distal ends of the elastic arms 531 protrude from the distal end of the sheath 300. In some embodiments, the elastic arm 531 has elastic deformation capability, that is, the ability of the elastic arm 531 to deform when an external force is applied, and to return to its original shape when the external force is removed.

In some embodiments, second coupling portion 500 includes a positioning structure 511, where positioning structure 511 is disposed at a proximal end of second coupling portion 500, and positioning structure 511 is disposed around a circumference of coupling tip 410 and limits a radial degree of freedom of coupling tip when coupling tip 410 enters second coupling portion 500. In some embodiments, as shown in fig. 4 and 5, the positioning structure 511 may be a structure independent of the fixing portion 520, and the positioning structure 511 may be configured as a ring structure having an inner diameter equal to or substantially equal to an outer diameter of the connection terminal 410. In some embodiments, as shown in fig. 6 and 7, positioning structure 511 may be a portion of the proximal end of securing portion 520, securing portion 520 configured as a cylindrical structure that allows connection tip 410 to pass through, the inner diameter of the cylindrical structure being equal or substantially equal to the outer diameter of connection tip 410. Through setting up location structure, when connection end 410 gets into second connecting portion 500, location structure 511 can carry out spacingly to connection end 410's circumference, makes connection end 410 only have the degree of freedom along axial displacement, can improve connection end 410's stability of moving in second connecting portion 500 to also be favorable to connection end 410 to pass the stability of butt joint with arm lock 200 behind the second connecting portion.

In some embodiments, the connection structure 510 and the fixation portion 520 may be of a split design. As shown in fig. 4 and 5, the connection structure 510 includes opposite buckles 530, the buckles 530 may be disposed on the positioning structure 511 at intervals, the proximal ends of the elastic arms 531 are fixedly connected with the positioning structure 511, and the distal ends of the elastic arms 531 extend into the fixing portion 520 and can move radially relative to the fixing portion 520.

In some embodiments, the connection structure 510 and the fixation portion 520 may be of unitary design. As shown in fig. 6 and 7, the elastic arm 531 of the connection structure 510 may be formed on a side wall of the fixing portion 520, the proximal end of the elastic arm 531 being connected to the fixing portion 520, the distal end extending obliquely inward with respect to the axial direction of the fixing portion 520, and the other end being also movable in the radial direction with respect to the fixing portion 520.

In some embodiments, the connection structure 510 may include at least two snaps 530. For example, the connection structure 510 includes two, three, four, eight snaps 530, etc., which snaps 530 are spaced apart with respect to the circumferential direction of the fixing portion 520.

In some embodiments, the spacing between the distal ends of spring arms 531 is less than the outer diameter of connection tip 410 (connection tip 410 is shown in fig. 3), and the outer diameter of connection tip 410 is less than the inner diameter of fixation section 520. Since the distance between the distal ends of the elastic arms 531 is smaller than the outer diameter of the connection terminal 410, the connection terminal 410 can generate a radially outward pressing force on the elastic arms 531 after entering the second connection part 500, and at this time, the elastic arms 531 are radially outwardly expanded and deformed; when coupling tip 410 exits second coupling portion 500, elastomeric arm 531 is no longer compressed by coupling tip 410, and elastomeric arm 531 resiliently deforms and contracts radially inward to its original position and shape.

In some embodiments, the outer diameter of connection tip 410 is greater than the outer diameter of the proximal end of mandrel 400. In some embodiments, connection tip 410 may be integrally formed with mandrel 400, e.g., connection tip 410 may be fabricated at one end of mandrel 400. In some embodiments, connection tip 410 may be removably coupled to mandrel 400, e.g., connection tip 410 or mandrel 400 may be provided with a threaded bore in one axial direction and the other with external threads corresponding to the threaded bore, such that connection tip 410 and mandrel 400 may be removably coupled via threads.

In some embodiments, as shown in fig. 4 and 5, the sidewall of the fixing portion 520 includes a connection hole 521, and the position of the limit protrusion 532 corresponds to the connection hole 521 and can move in a radial direction with respect to the connection hole 521. In some embodiments, when the elastic arm 531 and the fixing portion 520 are designed as separate components, the limiting protrusion 532 is disposed in the connecting hole 521 in a radially movable manner, so that the elastic arm 531 can be connected to the fixing portion 520; in addition, the connection hole 521 can prevent the limit protrusion 532 from being deflected, so that the limit protrusion 532 can be accurately coupled with the first connection part 110 of the receiving tube 100 after being moved in a radial direction within a limited space range of the connection hole 521.

In some embodiments, the inner diameter of the connection hole 521 is greater than the outer diameter dimension of the limit bump 532, such that the limit bump 532 can protrude from the inside of the fixing portion 520 to the outside of the fixing portion 520 through the connection hole 521.

In some embodiments, as shown in fig. 6 and 7, the side wall of the fixing portion 520 is formed with a slot 522, and the slot 522 may be a slot formed by cutting the elastic arm 531 from the side wall of the fixing portion 520, and the slot 522 extends from the distal end of the fixing portion 520 to a position where the elastic arm 531 is connected to the fixing portion 520. In some embodiments, the proximal end of the resilient arm 531 is connected to the proximal end of the slot 522, and the distal end of the resilient arm 531 extends obliquely inward relative to the slot 522, the resilient arm 531 having a radially outward elastic deformability relative to the slot. In some embodiments, the width of the slot 522 in the circumferential direction may be slightly greater than the width of the resilient arm 531, such that the stop tab 532 at the distal end of the resilient arm 531 can extend from the interior of the securing portion 520 to the exterior of the securing portion 520.

In some embodiments, the second connection portion 500 includes a stop structure for forming a stop fit with the sheath 300 to limit displacement of the second connection portion 500 in the axial direction of the sheath 300, thereby securing the second connection portion 500 at the distal end of the sheath 300.

In some embodiments, as shown in fig. 4 and 5, the spacing structure includes circumferentially disposed bosses 540. For example, the boss 540 may be disposed at a distal end of the fixing portion 520 and annularly protrude from an outer surface of the fixing portion 520. The distal end of the sheath 300 is formed with an annular groove 310 (shown in fig. 8 and 9) that mates with the boss 540, and the boss 540 mates with the annular groove 310 to secure the second connector 500 to the distal end of the sheath 300.

In some embodiments, as shown in fig. 8-9, the clip device 10 further includes an end cap 600, the end cap 600 being disposed at the distal end of the sheath 300, the end cap 600 including a cylindrical sidewall 610 and a flange 620, the flange 620 extending radially inward relative to the distal end of the cylindrical sidewall 610. In some embodiments, the inner diameter of the cylindrical sidewall 610 is greater than the outer diameter of the distal end of the sheath 300, such that the cylindrical sidewall 610 may fit over the outer surface of the distal end of the sheath 300. The flange 620 has an inner diameter larger than an outer diameter of the fixing portion 520 so that the fixing portion 520 can be protruded out of the end cap 600 to be coupled with the receiving tube 100. In some embodiments, the inner surface of the cylindrical sidewall 610 may be formed with internal threads and the outer surface of the distal end of the sheath 300 may be formed with external threads, such that the end cap 600 is secured to the distal end of the sheath 300 by the mating of the internal and external threads. In some embodiments, an annular groove 310 is formed between the flange 620 of the end cap 600 and the end face of the distal end of the sheath 300 to receive the boss 540, i.e., the boss 540 of the securing portion 520 is disposed between the flange 620 of the end cap 600 and the end face of the distal end of the sheath 300.

In some embodiments, as shown in fig. 6 and 7, the stop structure includes a radially protruding stop 550. For example, the stopper 550 may be disposed at any position of the sidewall of the fixing portion 520 and protrude from the outer surface of the fixing portion 520. The inner wall of the sheath 300 is formed with a groove or a limiting hole adapted to the limiting block 550, and the limiting block 550 is coupled to the groove or the limiting hole, so that the second connecting portion 500 is fixed at the distal end of the sheath 300.

In some embodiments, the stopper 550 may be an elastic block, and the sidewall of the fixing portion 520 is formed with a relief hole 560 corresponding to the stopper 550. During the process of assembling the second connection part 500 to the distal end of the sheath 300, at least part of the fixing part 520 is inserted into the inside of the distal end of the sheath 300, at which time the stopper 550 is pressed by the inner wall of the sheath 300 and retracted into the escape hole 560, at which time the fixing part 520 can move along the inner wall of the sheath 300. When the stopper 550 moves to the position of the groove or the limiting hole in the sheath 300, the extrusion acting force of the inner wall of the sheath 300 on the stopper 550 disappears, and the stopper 550 pops up into the groove or the limiting hole under the action of elastic restoring force, so that a limiting fit is formed with the inner wall of the sheath 300.

In some embodiments, referring to fig. 4-9, the releasable connection of the clip portion 11 and the delivery portion 12 may be performed by an operating portion, which may include a handle 700, a sliding portion 800, a mandrel 400, and the like. In some embodiments, one end of the mandrel 400 may extend into or out of the receiving tube 100, the other end of the mandrel 400 may be connected to the sliding portion 800, and the end of the mandrel 400 connected to the sliding portion 800 may be the proximal end of the mandrel 400, and the end not connected to the sliding portion 800 may be the distal end of the mandrel 400. In some embodiments, the distal end of the mandrel 400 may include the connection tip 410, and when the distal end of the mandrel 400 is extended into the receiving tube 100 through the distal end of the second connection part 500, since the snap 530 has elasticity and the distance between the distal ends of the oppositely disposed elastic arms 531 is smaller than the outer diameter of the connection tip 410, the distal ends of the snap 530 may be forced by the pressing force of the connection tip 410 such that the elastic arms 531 expand radially outwardly and drive the limit protrusions 532 connected with the distal ends of the elastic arms 531 to extend into the limit recesses 120. When the distal end of the mandrel 400 exits the storage tube 100 through the distal end of the second connecting portion 500, the distal end of the buckle 530 is no longer pressed by the connecting end 410, and the elastic arm 531 returns to elastic deformation, so as to drive the limit protrusion 532 to exit from the limit recess 120. In some embodiments, the distal end of the mandrel 400 may not include the connecting tip 410, and the outer diameter of the mandrel 400 may be larger than the inner diameter of the limit projection 532, and after the mandrel 400 is inserted into the limit projection 532, the limit projection 532 may be directly pressed, so that the limit projection 532 is inserted into the limit recess 120.

Fig. 10 is a structural view of the clip portion 11 shown in some embodiments of the present specification; fig. 11 is a cross-sectional view of clip portion 11 according to some embodiments of the present description.

In some embodiments, the lock engagement 231 may be one structure in the clip arm 200. Specifically, the clip arm 200 includes a first clip piece 210, a second clip piece 220, and a connection pin 230, and the first clip piece 210 and the second clip piece 220 are pinned by the connection pin 230. In some embodiments, one end of the connection pin 230 constitutes a locking engagement 231.

In some embodiments, the clip arm 200 includes a first clip piece 210, a second clip piece 220, and a connection pin 230, where the first clip piece 210 and the second clip piece 220 are connected by the connection pin 230, and in this embodiment, both ends of the connection pin 230 form a locking engagement portion 231. The connection pin 230 functions to both connect the first clip 210 and the second clip 220 and lock the clip arm 200, and has a simple structure.

In some embodiments, the proximal end of the first clip 210 is provided with a first bending portion 211 bending toward the second clip 220, the first bending portion 211 is provided with a first hole 212, the proximal end of the second clip 220 is provided with a second bending portion 221 bending toward the first clip 210, and the second bending portion 221 is provided with a second hole 222. In some embodiments, the bending angle between the first bending portion 211 and the first clip 210 is 85 ° to 95 °, and the bending angle between the second bending portion 221 and the second clip 220 is 85 ° to 95 °. In some embodiments, the sum of the bending angles of the first bending portion 211 and the second bending portion 221 is 180 °. In some embodiments, at least a portion of the first bore 212 and the second bore 222 are in overlapping communication, and the portion of the first bore 212 and the second bore 222 in overlapping communication constitutes the socket bore 240. Wherein "at least partially" overlapping includes partially overlapping communication, fully overlapping communication, partially overlapping communication refers to the first aperture 212 and the second aperture 222 being slightly staggered without fully overlapping, fully overlapping communication refers to the first aperture 212 fully overlapping the second aperture 222 or the second aperture 222 fully overlapping the first aperture 212. Wherein overlapping is understood as two holes communicating with each other. After the first hole 212 and the second hole 222 are communicated, a portion where the first hole 212 and the second hole 222 are communicated constitutes a socket hole 240.

FIG. 12 is a schematic illustration of ligation shown in accordance with some embodiments of the present disclosure; FIG. 13 is a schematic illustration of a ligation shown in accordance with some embodiments of the disclosure; fig. 14 is a schematic illustration of a ligation shown according to some embodiments of the disclosure.

In some embodiments, to achieve connection of the operating portion to the clip arm 200, the mandrel 400 may be sleeved within the sleeve hole 240. Specifically, the mandrel 400 may include a large diameter portion 420 and a small diameter portion 430, and the diameter of the large diameter portion 420 of the mandrel 400 is larger than the inner diameter of the socket 240, and the diameter of the small diameter portion 430 is smaller than the inner diameter of the socket 240. In some embodiments, small diameter portion 430 is fixedly connected to the distal end of mandrel 400, and large diameter portion 420 is fixedly connected to small diameter portion 430. In some embodiments, the distal end of mandrel 400 is fixedly connected to connection tip 410, the distal end of connection tip 410 is fixedly connected to small diameter portion 430, and the distal end of small diameter portion 430 is fixedly connected to large diameter portion 420. In some embodiments, the large diameter portion 420 and the small diameter portion 430 of the mandrel 400 may be integrally formed, or the large diameter portion 420 of the mandrel 400 may be fixedly connected to the small diameter portion 430 by cementing, fastening, welding, or the like.

In some embodiments, before the operation portion and the clip arm 200 are connected, the fixing portion 520 extending from the sheath 300 first enters the receiving tube 100, and during the process of moving the connecting tip 410 from the sheath 300 to the receiving tube 100, the connecting tip 410 presses the connecting structure 510, so that the distal end of the elastic arm 531 of the connecting structure 510 expands, and the limit projection 532 connected to the distal end of the elastic arm 531 extends into the limit recess 120, so as to complete the connection between the clip portion 11 and the delivery portion 12. When the operator pushes the mandrel 400 distally to the clip arm 200, after the large diameter portion 420 passes through the first hole 212 and the second hole 222, the connection of the clip arm 200 and the operation portion may be completed so that the clip arm 200 is controlled by the operation portion to perform a designated operation, for example, a ligation operation or the like.

Specifically, when the large diameter portion 420 of the mandrel 400 enters the socket hole 240, since the diameter of the large diameter portion 420 is larger than the inner diameter of the socket hole 240, the socket hole 240 is pressed by the large diameter portion 420 to increase the inner diameter, and at this time, the elastic ring 250 is pressed to have elastic force, so that the large diameter portion 420 passes through, and after the large diameter portion 420 passes through, the first clamping piece 210 and the second clamping piece 220 are separated from each other by the elastic force of the elastic ring 250, so that the first hole 212 and the second hole 222 are staggered with each other, resulting in the inner diameter of the socket hole 240 being reduced, so that the large diameter portion 420 cannot move proximally through the socket hole 240 without being affected by external force.

The clamping process of the clamping device 10 in the embodiment of the present specification may be as shown in fig. 12 to 14.

As shown in fig. 12, the clip portion 11 is delivered to the lesion through the delivery portion 12, and the first clip 210 and the second clip 220 are opened to provide ligation preparation for grasping the human tissue 900.

As shown in fig. 13, when the mandrel 400 is pulled to move proximally, the clip 11 moves proximally, the first clip 210 and the second clip 220 are gradually closed to ligate, when the clip 11 moves to the locking portion 130 or the vicinity of the locking portion 130, the locking engagement portion 231 presses the locking portion 130 outwards, the elastic sheet 131 can deform to enable the locking portion 130 to avoid the locking engagement portion 231 radially outwards, the locking engagement portion 231 moves to the proximal end of the locking portion 130, at this time, the first clip 210 and the second clip 220 are closed, the locking portion 130 is located at the distal end of the locking engagement portion 231, when the locking engagement portion 231 passes over the locking portion 130, the locking portion 130 rebounds, the locking portion 130 stretches into the receiving tube 100, and the locking portion 130 is located on the path of the distal movement of the locking engagement portion 231, so that the locking engagement portion 231 is blocked from moving distally, and the clip 11 cannot move to the distal end of the receiving tube 100, the clip 11 is prevented from being reopened after being closed, and the ligature is ensured.

As shown in fig. 14, after ligation, the mandrel 400 is pulled to move proximally, the connecting end 410 is withdrawn from the channel of the receiving tube 100, the limiting protrusion 532 is not extruded by the connecting end 410, the limiting protrusion 532 returns to elastic deformation, and then the limiting recess 120 is withdrawn, so that the connection relationship between the sheath 300 and the receiving tube 100 is released; the large diameter portion 420 of the connecting terminal 410 is removed from the socket 240, and the connection between the mandrel 400 and the clip 11 is released. Thus, the connection between the delivery unit 12 and the clip unit 11 is released, and the delivery unit 12 can be removed, leaving the clip unit 11 in the ligature state.

Fig. 15 is a schematic structural view of a conveying portion and a clip portion according to other embodiments of the present specification.

As shown in fig. 15, in some embodiments, when the second connection part 500 enters the position of the first connection part 110 in the receiving tube 100, the second connection part 500 may be expanded outward in a natural state, the second connection part 500 is connected with the first connection part 110, and the clip part 11 is connected with the delivery part 12. The outward expansion of the second connection part 500 in the natural state (the state in which no deformation occurs) means that at least part of the structure on the second connection part 500 protrudes in the radial direction in the natural state. In some embodiments, when the second connecting portion 500 enters the position of the first connecting portion 110 in the receiving tube 100, the protruding portion may form a fit with the first connecting portion 110 (e.g., a structure with a groove) so as to connect the second connecting portion 500 and the first connecting portion 110. In some embodiments, when connecting tip 410 is withdrawn from storage tube 100 from the distal end to the proximal end, second connecting portion 500 may be moved proximally, so that the protruding portion of second connecting portion 500 may be compressed to retract, second connecting portion 500 and first connecting portion 110 may be released, and clip portion 11 and delivery portion 12 may be separated. For more details on the second connection 500, see fig. 16 and the description thereof.

According to the second connection part 500 in the above-described embodiment, the first connection part 110 and the second connection part 500 are detachably coupled such that the receiving tube 100 is detachably coupled with the delivery part 12, the receiving tube 100 may be separated from the delivery part 12 after the clip part 11 clamps the lesion, and the clip part 11 and the receiving tube 100 may be left at the lesion to maintain hemostasis or ligation. When the second connecting portion 500 enters the position of the first connecting portion 110 in the storage tube 100, the second connecting portion 500 expands outwards in a natural state, so that the storage tube 100 and the conveying portion 12 can be conveniently connected under the condition that no external force is provided. When the connecting end 410 is withdrawn from the storage tube 100 from the distal end to the proximal end, the second connecting portion 500 can be driven to retract inwards, so that the reliability of the storage tube 100 when being separated from the conveying portion 12 can be improved, and the situation of difficult separation can be avoided. By the entry and exit of the second connection part 500 into and from the receiving tube 100, the second connection part 500 is expanded into a natural state and contracted into a compressed state in the radial direction to couple and separate the first connection part 110, so that the operation is convenient and stable, the structure is simple, and the clip part 11 is easily separated from the conveying part 12.

FIG. 16 is a schematic view of a second connection portion according to other embodiments of the present disclosure; fig. 17 is a schematic view of a structure of a receiving tube according to other embodiments of the present specification.

In some embodiments, referring to fig. 16, the second connection portion 500 includes a connection structure 510 and a fixing portion 520, and a proximal end of the connection structure 510 is connected to the fixing portion 520. In some embodiments, the fixing portion 520 may be circular or cylindrical, and the connection structure 510 may be connected with the outer circumferential wall of the fixing portion 520. In some embodiments, the connection structure 510 expands radially outward in a natural state and is capable of contracting radially inward when compressed. Specifically, the connection structure 510 includes a buckle 530, where the buckle 530 includes a resilient arm 531 and a limiting protrusion 532 disposed at a distal end of the resilient arm 531 and extending radially outward.

In some embodiments, the proximal end of the spring arm 531 may be fixed to the fixing portion 520 with the distal end flush with the side of the fixing portion 520, and the stopper 532 is provided at the distal end of the spring arm 531 and extends radially outward to protrude from the outer side of the fixing portion 520. In some embodiments, the resilient arms 531 may also expand gradually outwardly from the proximal end to the distal end. In some embodiments, at least a portion (e.g., a portion near the distal end) of the resilient arm 531 and the stop tab 532 may each protrude radially outward from the outer side of the fixation portion 520 in the natural state.

When the second connecting portion 500 enters the receiving tube 100 where the first connecting portion 110 is located, the elastic arm 531 is elastic, and the limiting protrusion 532 protrudes outwards, so that the limiting protrusion 532 is pressed by the inner wall of the sheath 300, and when the distal end of the elastic arm 531 does not reach the limiting recess 532, the distal end of the elastic arm 531 maintains a contracted state. When the limiting protrusion 532 moves to the limiting recess 120, the limiting protrusion 532 is not pressed, the elastic arm 531 is opened due to its elasticity, and the natural state of being flush with the side surface of the fixing portion 520 is restored, and at this time, the limiting protrusion 532 is locked into the limiting recess 120, and the second connection portion 500 is connected with the first connection portion 110. When the second connection part 500 is withdrawn from the receiving tube 100, the limiting protrusion 532 is pressed by the limiting recess 120, so that the distal end of the elastic arm 531 is contracted inwards, and the second connection part 500 is separated from the first connection part 110.

In some embodiments, referring to fig. 17, the first connection portion 110 may include a limit recess 120 disposed at a proximal end of the receiving tube 100, the limit recess 120 for mating with the second connection portion 500. In some embodiments, the limiting recess 120 and the receiving tube 100 may be integrally formed. For example, the limit recess 120 may be a blind hole, a through hole, or a groove opened at the inner side of the sidewall of the receiving tube 100. In some embodiments, a step protruding toward the central axis of the receiving tube 100 is provided on the inner wall of the receiving tube 100, and a limit recess 120 may be formed between the step (e.g., the distal end surface of the step) and the inner wall of the receiving tube 100. In some embodiments, the limiting recess 120 and the receiving tube 100 are of a split structure, and the limiting recess 120 is fixed inside the receiving tube 100. For example, the limiting recess 120 may be a limiting ring or an annular groove, and is fixedly connected to the inner wall of the receiving tube 100 by welding, bonding, fastening, or the like. The stepped limit recess 120 can simplify the structure of the first connection part 110 and improve the stability of the second connection part 500 when connected with the first connection part 110.

As shown in fig. 16, in some embodiments, the second connection portion 500 may be provided with a limiting piece 570, where a proximal end of the limiting piece 570 is connected to the second connection portion 500, a distal end of the limiting piece 570 extends into the second connection portion 500, and the connection terminal 410 may be provided with an abutment portion 411, where when the connection terminal 410 is withdrawn from the storage tube 100 from the distal end to the proximal end, the abutment portion 411 abuts against the limiting piece 570, and drives the second connection portion 500 to move proximally.

According to the second connecting portion 500 and the connecting end 410 in the above embodiment, the limiting piece 570 can be abutted with the abutting portion 411, after the clamp portion 11 clamps the lesion, the mandrel 400 is pulled to move further to the proximal end, the connecting end 410 at the tail end of the mandrel 40 can drive the second connecting portion 500 to move to the proximal end, and gradually pull the second connecting portion 500 out of the storage tube 100, so that the conveying portion 12 is separated from the storage tube 100, the clamp portion 11 is left in the patient, and the structure is simple, so that an operator can separate the conveying portion 12 from the storage tube 100 conveniently.

In some embodiments, the limiting plate 570 may be integrally formed with the second connection part 500, for example, the shape of the limiting plate 570 may be cut out on the side wall of the second connection part 500, and the distal end of the limiting plate 570 is bent into the second connection part 500 without separating the proximal end of the limiting plate 570 from the second connection part 500. In some embodiments, the limiting plate 570 may be designed separately from the second connection part 500, for example, a groove for receiving the limiting plate 570 may be formed in a sidewall of the second connection part 500, and then a proximal end of the limiting plate 570 may be fixed to the proximal end of the groove by means of bonding, welding or fastening, and a distal end of the limiting plate 570 may freely extend into the second connection part 500 or retract into the groove.

In some embodiments, abutment 411 may be a portion of connection tip 410, for example, abutment 411 may be a shoulder on the circumferential side of connection tip 410 with the end face of the shoulder facing the proximal end of connection tip 410 and abutting stop tab 570. In some embodiments, abutment 411 may also be designed separately from coupling tip 410, coupled to coupling tip 410 by welding, bonding, and fasteners, for example, abutment 411 may be a collar disposed on the peripheral side of coupling tip 410 with one end face of the collar facing the proximal end of coupling tip 410.

In some embodiments, two limiting sheets 570 may be symmetrically disposed in the second connection part 500, and a distance between distal ends of the two limiting sheets 570 is smaller than an outer diameter of the abutting part 411, so that the limiting sheets 570 can abut against the abutting part 411. In some embodiments, the outer diameter of the abutment 411 is smaller than the inner diameter of the second connection portion 500, so that the connection tip 410 can smoothly pass through the inside of the second connection portion 500. In some embodiments, the number of the limiting plates 570 may be plural, for example, three, four, five, etc., which the present embodiments do not limit.

Fig. 18 is a cross-sectional view of the second connection portion shown in fig. 16.

In some embodiments, as shown in fig. 18, the outer side of the stop tab 532 is disposed obliquely, with the outer side at least partially radially outward. In some embodiments, the angle α between the stop tab 532 and the spring arm 531 may be greater than 90 °. When the second connection portion 500 moves from the distal end to the proximal end, the obliquely arranged outer side surface abuts against the limit recess 120, so that the limit recess 120 applies a force perpendicular to the outer side surface, and the sum of the proximally-directed tensile forces applied to the second connection portion 500 is radially inward, so that the limit protrusion 532 is contracted inward. The outer side surface of the obliquely arranged limiting projection 532 can facilitate the elastic arm 531 to retract into the second connecting part 500, and the operator can conveniently separate the clip part 11 from the conveying part 12. It will be appreciated that, when the elastic capability of the elastic arm 531 is better, the included angle α may be smaller than 90 °, and the limiting protrusion 532 may also retract inwardly, and when the included angle α is smaller than 90 °, the connection stability between the second connection portion 500 and the first connection portion 110 in a natural state may be further improved. In some embodiments, in order to further ensure the connection stability between the second connection portion 500 and the first connection portion 110 in the natural state, the range of the angle α should not be too large. In some embodiments, angle α may range from 45 to 135. In order to further improve the connection stability between the second connection part 500 and the first connection part 110 in the natural state, the angle α may have a value ranging from 60 ° to 85 °. To further facilitate the separation of the second connection 500 from the first connection 110, the angle α may have a value ranging from 85 ° to 120 °. In some embodiments, the angle α may be 85 ° for both connection stability and ease of separation.

Fig. 19 is a schematic structural view of a second connecting portion according to other embodiments of the present specification.

As shown in fig. 19, in some embodiments, a stopper 570 may be provided at a proximal end of the fixing portion 520, a distal end of the stopper 570 being connected to the fixing portion 520, and a proximal end of the stopper 570 extending inward of the second connecting portion.

In some embodiments, the number of the limiting tabs 470 may be four, and the proximal ends of the four limiting tabs 470 enclose a channel having an inner diameter smaller than the outer diameter of the abutment 411, so that the limiting tab 570 can abut against the abutment 411. In some embodiments, the number of the limiting sheets 570 may be plural, for example, two, three, five, etc., which the present embodiments do not limit.

Fig. 20 is a schematic structural view of a second connecting portion according to other embodiments of the present specification.

As shown in fig. 20, in some embodiments, the limiting plate 570 may be staggered with respect to the boss 540 and the catch 530, and the proximal end of the limiting plate 570, the proximal end of the boss 540, and the proximal end of the catch 530 are all connected to the distal end of the fixing portion 520. In some embodiments, the distal end of the stopper piece 570 may extend inward of the second connection part 500, for example, the thickness of the distal inner side of the stopper piece 570 may be greater than the thickness of the inner wall of the second connection part 500, or the distal end of the stopper piece 570 may be bent inward of the second connection part 500.

In some embodiments, where the resilient arms 531 extend outwardly in a natural state, the second connection 500 may further include a cinch ring 580, the cinch ring 580 being disposed within the annular recess 310 and the second connection 500 being disposed within the cinch ring 580. When the second connection portion 500 moves proximally and withdraws from the proximal end of the receiving tube 100, since the tie ring 580 is caught in the annular groove 310, the tie ring 580 moves distally with respect to the second connection portion 500, and the tie ring 580 can force the elastic arm 531 to gradually contract, so that the limit projection 532 is withdrawn from the limit recess 120, thereby releasing the connection between the first connection portion 110 and the second connection portion 500.

In some embodiments, the limiting sheet 570 is not easily deformed relative to the fixing portion 520, or the limiting sheet 570 may be rigidly connected to the fixing portion 520, so that the limiting sheet 470 does not expand outwards, and the limiting sheet 570 and the abutting portion 411 can abut more stably.

Fig. 21 is a schematic view showing a ligating state according to other embodiments of the present specification.

As shown in fig. 21, in some embodiments, the receiving tube 100 may include a resisting portion 140, where the resisting portion 140 is located at a distal end of the first connecting portion 110, and the resisting portion 140 is configured to limit the displacement of the clip arm 200 toward the proximal end along the axial direction of the receiving tube 100.

In some embodiments, the proximal end of the abutment 140 may be connected to the receiving tube 100, with the distal end of the abutment 140 extending into the interior of the receiving tube 100. In some embodiments, the abutment 140 may be integrally formed with the receiving tube 100, for example, by cutting the shape of the abutment 140 on the sidewall of the receiving tube 100, and bending the distal end of the abutment 140 into the receiving tube 100 without separating the proximal end of the abutment 140 from the receiving tube 100. In some embodiments, the retaining portion 140 may be designed separately from the receiving tube 100, for example, a groove may be formed in the sidewall of the receiving tube 100 to receive the retaining portion 140, and then the proximal end of the retaining portion 140 may be fixed to the proximal end of the groove by bonding, welding or fastening, and the distal end of the retaining portion 140 may freely extend into the receiving tube 100 or retract into the groove.

In some embodiments, the resisting portion 140 may include two elastic pieces 141 symmetrically disposed within the receiving tube 100, and a distance between distal ends of the two elastic pieces 141 is smaller than a maximum width of the first bending portion 211 or the second bending portion 221.

In the process of clamping the clip portion 11, an operator can pull the mandrel 400 proximally, the connecting end 410 on the mandrel 400 can drive the clip arm 200 to move proximally into the storage tube 100, the first clip piece 210 and the second clip piece 220 are gradually closed and folded, the clip arm 200 is retracted into the storage tube 100, the proximal end (i.e. the first bending portion 211 or the second bending portion 221) of the clip arm 200 abuts against the distal end of the elastic piece 141 after passing through the locking portion 130, the clip arm 200 is prevented from moving proximally, the connecting end 410 continues to move proximally, the large-diameter portion 420 is separated from the socket hole 240, and the connecting end 410 and the clip arm 200 are separated.

The abutment 140 can also provide feedback information (e.g., resistance feedback) to the operator after the clamp arm 200 moves into abutment with the abutment 140 so that the operator knows the position of the clamp arm 200. When it is desired to release the connection between clip portion 11 and delivery portion 12, the operator may continue to pull mandrel 400 proximally after receiving the feedback information to disengage connecting tip 410 from clip arm 200. After the connecting end 410 is separated from the clip arm 200, the connecting end 410 continues to move proximally, and when the abutting portion 411 on the connecting end 410 abuts against the limiting piece 570, the connecting end 410 can drive the second connecting portion 500 to move proximally, so as to drive the second connecting portion 500 to withdraw from the storage tube 100, and the clip portion 11 is separated from the conveying portion 12.

In some embodiments, the abutment 140 may also be one or more steps or protrusions provided on the inner wall of the receiving tube 100. For example, there may be two protrusions provided on the inner wall of the receiving tube, the interval between the two protrusions being smaller than the maximum width of the first bending portion 211 or the second bending portion 221, or there may be an annular step provided on the inner wall of the receiving tube 100, the inner diameter of which is smaller than the maximum width of the first bending portion 211 or the second bending portion 221. The abutment 140 may be of other forms, and the embodiment is not limited thereto, as long as the displacement of the clip arm 200 toward the proximal end in the axial direction of the receiving tube 100 can be restricted.

By providing the abutment 140 on the storage tube 100, when the proximal end of the clip arm 200 abuts against the distal end of the abutment 140, the abutment 140 can limit the clip arm 200 from moving proximally in the axial direction, so as to facilitate separation of the clip arm 200 and the connection terminal 410, and simultaneously provide force feedback to an operator, so that the operator can determine the position of the current clip arm 200 by operating the hand feeling, and learn to pull the mandrel 400 proximally again, so as to separate the clip arm 200 and the connection terminal 410.

In some embodiments, the outer diameter of abutment 411 is less than the minimum distance between the distal ends of abutments 140, preventing abutment 411 from catching on abutments 140 when connection tip 410 is moved proximally from the distal end of storage tube 100. In some embodiments, the inner diameter of the second connection 500 may also be equal to the minimum distance between the distal ends of the abutments 140.

In some embodiments, the abutment 140 may include a bending structure 142, a distal end of the bending structure 142 is connected with a distal end of the elastic piece 141, and a proximal end of the bending structure 142 extends inward of the abutment 140, further reducing a space between the abutments 140. The bending structure 142 and the elastic piece 141 may form an "L" structure, when the connecting terminal 410 moves from the distal end to the proximal end of the receiving tube 100, the bending structure 142 can contact the abutting portion 411 before the elastic piece 141, and the abutting portion 411 presses the bending structure 142 radially outwards, so as to prevent the abutting portion 411 from being blocked on the blocking portion 140. In some embodiments, the bent structure 142 may also be provided with relief slots for the passage of the connecting end 140.

As shown in fig. 22, in some embodiments, the delivery portion 12 may further include an elastic member 440, the distal end of the sheath 300 includes a receiving section 320, the elastic member 440 is disposed in the receiving section 320, the proximal end of the receiving section 320 includes a blocking portion 330, the proximal end of the elastic member 440 abuts against the blocking portion 330, and the proximal end of the second connecting portion 500 is disposed in the receiving section 320 and abuts against the distal end of the elastic member 440. In some embodiments, the elastic member 440 may be a spring that is sleeved on the mandrel 400. In some embodiments, the outer diameter of the elastic member 440 may be greater than the inner diameter of the second connection part 500 such that the second connection part 500 can abut against the distal end of the elastic member 440.

In some embodiments, the elastic member 440 may have a first elastic force when the second connection portion 500 is connected with the first connection portion 110. When the second connection part 500 and the first connection part 110 are released, the elastic member 440 may have a second elastic force, and the second elastic force may be greater than the first elastic force.

When the clip portion 11 and the conveying portion 12 are connected, the second connecting portion 500 is connected to the first connecting portion 110, and the elastic member 440 is in a natural state or a compressed state at this time, having a first elastic force. When the mandrel 400 is pulled proximally and the connecting tip 410 moves proximally, when the abutting portion 411 abuts against the limiting piece 570, the pulling connecting tip 410 can drive the second connecting portion 500 to move proximally continuously, the second connecting portion 500 is withdrawn from the storage tube 100 and the sheath 300 is withdrawn, the proximal end of the second connecting portion 500 presses the elastic member 440, so that the elastic member 440 is in a compressed state, the elastic member 440 has a second elastic force, the second elastic force is larger than the first elastic force, and the clip portion 11 is separated from the conveying portion 12. When the other clip part 11 is mounted, the clip part 11 to be mounted is abutted against the distal end of the conveying part 12, the mandrel 400 is released, the elastic member 440 ejects the second connecting part 500 distally due to its own elasticity, and the second connecting part 500 enters the receiving tube 100 of the second clip part 11. It can be understood that, when the second connection portion 500 is connected to the first connection portion 110 and the elastic member 440 is in a natural state, the first elastic force is 0.

Referring to fig. 22, in some embodiments, the sheath 300 may include a stop 340, the stop 340 being disposed inward of the distal end of the sheath 300, the distal end of the stop 340 being configured to abut the proximal end of the receiving tube 100.

In some embodiments, the stop 340 may be integrally formed with the sheath 300, for example, the stop 340 may be an annular step disposed inboard of the distal end of the sheath 300, and the distal end of the annular step may abut the proximal end of the receiving tube 100. In some embodiments, the stop block 340 may be configured separately from the sheath 300, and the stop block 340 and the sheath 300 may be connected by welding, adhesive, or fasteners. When the stop 340 abuts against the proximal end of the storage tube 100, the second connection portion 500 may enter or withdraw from the storage tube 100 through the connection between the stop 340 and the storage tube 100.

In some embodiments, the distal end of the stop block 340 may have a coating section 350, the coating section 350 having an inner diameter that is greater than the inner diameter of the stop block 340. When the receiving tube 100 is connected to the sheath 300, the coating section 350 can limit the radial displacement of the receiving tube 100, thereby improving the connection stability.

In some embodiments, the inner diameter of the stop 340 may be less than or equal to the inner diameter of the proximal end of the receiving tube 100. In order to keep the second connection part 500 smooth when moving from the proximal end to the distal end, the limiting stand having the same or smaller inner diameter can prevent the limiting protrusion 532 of the second connection part 500 from being caught at the junction of the limiting stand 340 and the receiving tube 100, and at the same time, when the second connection part 500 moves from the distal end to the proximal end, since the outer side of the limiting protrusion 532 is an inclined surface, even if the inner diameter of the limiting stand 340 is smaller than the inner diameter of the proximal end of the receiving tube 100, the second connection part 500 can be contracted inwards, so that the second connection part 500 smoothly passes through the junction of the limiting stand 340 and the receiving tube 100.

In some embodiments, the proximal end of the stop block 340 may be provided with a ramp 341, the ramp 341 at least partially facing the proximal end, the ramp 341 increasing the distal end of the stop block 340 from the distal to proximal inner diameter. When the distal end of the second limiting portion 500 abuts against the inclined plane 341, the distal end of the buckle 530 of the second limiting portion 500 can be gradually contracted when the second limiting portion 500 moves from the proximal end to the distal end, and the buckle of the second limiting portion is changed from a natural state to a contracted state, so that the second limiting portion is prevented from being clamped at the limiting table 340.

In some embodiments, the clamping device 10 further includes an end cap 600, the end cap 600 is a hollow structure, and the limiting platform 340 may be disposed on the end cap 600. The end cover 600 can be located the distal end of sheath 300, and limit table 340 can be with end cover 600 integrated into one piece, and the proximal end of end cover 600 and the distal end threaded connection of sheath 300, limit table 340 locate the inboard of end cover 600 distal end, and the distal end of limit table 340 can with accomodate the proximal end butt of pipe 100.

In some embodiments, the proximal end of the stop block 340 may be provided with an annular groove 310. In some embodiments, an annular groove 310 is formed between the inner wall of end cap 600 and the end face of the distal end of sheath 300 to receive boss 540.

In some embodiments, the second connection 500 includes a boss 540 that limits proximal movement of the second connection 500 after abutment of the boss 540 with the annular groove 310.

Referring to fig. 19, in some embodiments, a boss 540 may be provided at the distal end of the fixation portion 520. When the second connection part 500 moves proximally, the catch 530 withdraws from the receiving tube 100 and enters the annular groove 310, the end surface of the proximal end of the boss 540 abuts the end surface of the distal end of the annular groove 310, limiting the movement of the second connection part 500 proximally.

Referring to fig. 20, in some embodiments, boss 540 may include a protrusion 541 and a connecting arm 542. The proximal end of the connection arm 542 is connected to the proximal end of the fixing portion 520, and the distal end of the connection arm 542 is provided with a projection 541. When the second connection portion 500 moves distally and enters the proximal end of the receiving tube 100, the protrusion 541 may pass through the section of the sheath 300 having different inner diameters, and the radially outer side of the protrusion 541 may be pressed by the sheath 300 to deflect the connection arm 542 inwardly, so as to avoid the protrusion 541 from being blocked by other structures in the sheath 300. When the second connection 500 is moved proximally, the axially proximal face of the projection 541 may abut the distal face of the cinch ring 580 as the catch 530 is withdrawn from the receiving tube 100 and enters the annular recess 310, thereby preventing further proximal movement of the second connection 500.

Possible benefits of embodiments of the present description include, but are not limited to: (1) The clamping device is used for detachably matching the storage tube with the conveying part through the first connecting part of the storage tube and the second connecting part of the conveying part, so that the clamp part is conveniently kept at the focus to stop bleeding or ligate; (2) The second connecting part is operated through the connecting end of the mandrel, so that the second connecting part is matched and separated from the first connecting part through radial expansion and contraction, the operation is convenient and stable, the structure is simple, and the second connecting part is easy to separate from the first connecting part; (3) The locking matching part is used for locking the axial position relation of the clamping arm and the storage tube, so that the clamping arm is prevented from moving from the distal end of the storage tube to open; (4) The connecting pin not only plays a role in connecting the first clamping piece and the second clamping piece, but also plays a role in locking the clamping arm, and has a simple structure; (5) The second connecting part is driven to move towards the proximal end through the connecting end head, so that the originally expanded second connecting part is contracted, and the separation operation of the conveying part and the clip part is more reliable. It should be noted that, the advantages that may be generated by different embodiments may be different, and in different embodiments, the advantages that may be generated may be any one or a combination of several of the above, or any other possible advantages that may be obtained.

While the basic concepts have been described above, it will be apparent to those skilled in the art that the foregoing detailed disclosure is by way of example only and is not intended to be limiting. Although not explicitly described herein, various modifications, improvements, and adaptations to the present disclosure may occur to one skilled in the art. Such modifications, improvements, and modifications are intended to be suggested within this specification, and therefore, such modifications, improvements, and modifications are intended to be included within the spirit and scope of the exemplary embodiments of the present invention.

Meanwhile, the specification uses specific words to describe the embodiments of the specification. Reference to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic is associated with at least one embodiment of the present description. Thus, it should be emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various positions in this specification are not necessarily referring to the same embodiment. Furthermore, certain features, structures, or characteristics of one or more embodiments of the present description may be combined as suitable.

Likewise, it should be noted that in order to simplify the presentation disclosed in this specification, and thereby aid in understanding one or more embodiments, various features are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of the preceding description of the embodiments of the present specification. This method of disclosure, however, is not intended to imply that more features than are presented in the claims are required for the present description. Indeed, less than all of the features of a single embodiment disclosed above.

In some embodiments, numbers describing the components, number of attributes are used, it being understood that such numbers being used in the description of embodiments are modified in some examples by the modifier "about," approximately, "or" substantially. Unless otherwise indicated, "about," "approximately," or "substantially" indicate that the number allows for a 20% variation. Accordingly, in some embodiments, numerical parameters set forth in the specification and claims are approximations that may vary depending upon the desired properties sought to be obtained by the individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and employ a method for preserving the general number of digits. Although the numerical ranges and parameters set forth herein are approximations that may be employed in some embodiments to confirm the breadth of the range, in particular embodiments, the setting of such numerical values is as precise as possible.

Finally, it should be understood that the embodiments described in this specification are merely illustrative of the principles of the embodiments of this specification. Other variations are possible within the scope of this description. Thus, by way of example, and not limitation, alternative configurations of embodiments of the present specification may be considered as consistent with the teachings of the present specification. Accordingly, the embodiments of the present specification are not limited to only the embodiments explicitly described and depicted in the present specification.

Claims

1. A clamping device, comprising:

a clip part (11), wherein the clip part (11) comprises a storage tube (100) and a clip arm (200);

a delivery part (12), wherein the delivery part (12) comprises a sheath tube (300) and a mandrel (400) moving in a channel of the sheath tube (300), a connecting end head (410) is arranged at the distal end of the mandrel (400), the connecting end head (410) is in releasable connection with the clamping arm (200), and the distal end of the sheath tube (300) is in releasable connection with the containing tube (100);

the storage tube (100) is provided with a first connecting part (110), and the conveying part (12) is provided with a second connecting part (500);

when the connecting end head (410) enters the far end of the second connecting part (500), the second connecting part (500) expands outwards in the radial direction, the second connecting part (500) is connected with the first connecting part (110), and the clip part (11) is connected with the sheath tube (300); when the connecting tip (410) exits from the distal end of the second connecting portion (500), the second connecting portion (500) is contracted radially inward, the second connecting portion (500) and the first connecting portion (110) are released, and the clip portion (11) and the sheath tube (300) are separated.

2. The clamping device according to claim 1, wherein the second connection portion (500) comprises a connection structure (510) and a fixation portion (520), at least part of the second connection portion (500) being arranged within the sheath (300), at least another part of the second connection portion (500) protruding from the distal end of the sheath (300).

3. Clamping device according to claim 2, characterized in that the outer diameter of the fixing portion (520) is the same or substantially the same as the inner diameter of the proximal end of the receiving tube (100).

4. Clamping device according to claim 2, wherein the connection structure (510) comprises oppositely arranged catches (530), the catches (530) comprising resilient arms (531) and radially outwardly extending stop ledges (532) provided at distal ends of the resilient arms (531).

5. The clamping device according to claim 4, wherein the first connection portion (110) comprises a limit recess (120) arranged at the proximal end of the receiving tube (100), the limit recess (120) being adapted to mate with the limit projection.

6. The clamping device of claim 5, wherein the limit projection (532) extends into the limit recess (120) when the connection tip (410) enters the distal end of the second connection portion (500); when the connecting end head (410) exits from the distal end of the second connecting part (500), the limit convex (532) is separated from the limit concave (120).

7. The clamping device of claim 5, wherein the limiting recess is integrally formed with the receiving tube; or, spacing concave with accomodate the pipe and be split type structure, spacing concave is fixed accomodate the inside of pipe.

8. The clamping device as recited in claim 4, characterised in that a distance between distal ends of said resilient arms (531) is smaller than an outer diameter of said connection terminal (410), said connection terminal (410) having an outer diameter smaller than an inner diameter of said fixing portion (520).

9. Clamping device according to claim 4, characterized in that the fixing portion (520) comprises a connection hole (521), the position of the limit projection (532) corresponding to the connection hole and being movable in radial direction with respect to the connection hole.

10. Clamping device according to claim 4, characterized in that the side wall of the fixation portion is formed with a slot (522), the proximal end of the resilient arm being connected to the proximal end of the slot, the distal end of the resilient arm extending obliquely inwards with respect to the slot (522).

11. Clamping device according to claim 2, characterized in that the second connection part comprises a positioning structure arranged at the proximal end of the second connection part, the positioning structure being arranged around the circumference of the connection tip and limiting the radial freedom of the connection tip when the connection tip (410) enters the second connection part (500).

12. The clamping device according to claim 1, wherein the second connection portion (500) comprises a limiting structure for forming a limiting fit with the sheath (300) for limiting displacement of the second connection portion (500) in an axial direction of the sheath (300).

13. Clamping device according to claim 12, characterized in that the limit structure comprises a radially protruding limit block (550) or a circumferentially arranged boss (540).

14. The clamping device according to claim 1, wherein the receiving tube (100) comprises a locking portion (130), the clamping arm (200) comprises a locking mating portion (231), and the clamping arm (200) is relatively fixed with the receiving tube (100) when the locking portion (130) is mated with the locking mating portion (231).

15. Clamping device according to claim 14, wherein the locking portion (130) comprises a spring (131), the distal end of the spring (131) being connected to the receiving tube (100), the proximal end of the spring (131) extending into the receiving tube (100).

16. The clamping device according to claim 14, characterized in that the clamping arm (200) comprises a first clamping piece (210), a second clamping piece (220) and a connecting pin (230), the first clamping piece (210) and the second clamping piece (220) are connected through the connecting pin (230), one end of the connecting pin (230) forms the locking mating part (231), or both ends of the connecting pin (230) form the locking mating part (231).

17. The clamping device according to claim 16, wherein a first bending portion (211) bending towards the second clamping piece (220) is arranged at one end of the first clamping piece (210) close to the connecting pin (230), and a first hole (212) is arranged at the first bending portion (211); a second bending part (221) bending towards the first clamping piece (210) is arranged at one end, close to the connecting pin (230), of the second clamping piece (220), and a second hole (222) is formed in the second bending part (221); at least a portion of the first aperture (212) and the second aperture (222) overlap.

18. The clamping device of claim 17, wherein the mandrel (400) comprises a large diameter portion (420) and a small diameter portion (430), the small diameter portion (430) being fixedly connected to the connection tip (410), the large diameter portion (420) being fixedly connected to the small diameter portion (430), the large diameter portion (420) having a diameter greater than the small diameter portion (430);

at least part of the first hole (212) and the second hole (222) are overlapped and communicated to form a sleeving hole (240); the diameter of the large diameter part (420) is larger than the inner diameter of the sleeve joint hole (240), and the diameter of the small diameter part (430) is smaller than the inner diameter of the sleeve joint hole (240).

19. A clamping device, comprising:

When the second connecting part (500) enters the position of the first connecting part (110) in the storage tube (100), the second connecting part (500) expands outwards in a natural state, the second connecting part (500) is connected with the first connecting part (110), and the clip part (11) is connected with the conveying part (12); when the connecting end head (410) is withdrawn from the storage tube (100) from the distal end to the proximal end, the second connecting portion (500) is driven to move towards the proximal end, the second connecting portion (500) and the first connecting portion (110) are released, and the clip portion (11) and the conveying portion (12) are separated.

20. The clamping device of claim 19, wherein the receiving tube (100) comprises a abutment (140), the abutment (140) being located distally of the first connection portion (110), the abutment (140) being adapted to limit displacement of the clamping arm (200) distally in an axial direction of the receiving tube (100).

21. The clamping device as claimed in claim 19, wherein the second connecting portion (500) is provided with a limiting piece (570), a proximal end of the limiting piece (570) is connected with the second connecting portion (500), a distal end of the limiting piece (570) extends into the second connecting portion (500), the connecting end (410) is provided with an abutting portion (411), and when the connecting end (410) is withdrawn from the receiving tube (100) from the distal end to the proximal end, the abutting portion (411) and the limiting piece (570) abut and then drive the second connecting portion (500) to move proximally.

22. The clamping device of claim 21, wherein the second connection portion (500) comprises a connection structure (510) and a fixation portion (520), the proximal end of the connection structure (510) being connected to the fixation portion (520), the connection structure (510) comprising a clasp (530), the clasp (530) comprising a resilient arm (531) and a stop tab (532) provided at the distal end of the resilient arm (531) extending radially outwards.

23. Clamping device according to claim 22, characterized in that the outer side of the limit projection (532) is arranged obliquely and the outer side is at least partly radially outwards.

24. The clamping device of claim 19, wherein the delivery portion (12) further comprises an elastic member (440), the distal end of the sheath (300) comprises a receiving section (320), the elastic member (440) is disposed within the receiving section (320), the proximal end of the receiving section (320) comprises a blocking portion (330), the proximal end of the elastic member (440) abuts the blocking portion (330), and the proximal end of the second connecting portion (500) is disposed within the receiving section (320) and abuts the distal end of the elastic member (440).

25. The clamping device according to claim 24, characterized in that the elastic member (440) has a first elastic force when the second connection part (500) is connected with the first connection part (110), and the elastic member (440) has a second elastic force when the second connection part (500) and the first connection part (110) are released, the second elastic force being larger than the first elastic force.

26. The clamping device according to claim 19, wherein the sheath (300) comprises a stop (340), the stop (340) being provided inside the distal end of the sheath (300), the distal end of the stop (340) being adapted to abut the proximal end of the receiving tube (100).

27. The clamping device according to claim 26, wherein the inner diameter of the stop table (340) is smaller than or equal to the inner diameter of the proximal end of the receiving tube (100), the proximal end of the stop table (340) being provided as a bevel (341), the bevel (341) increasing the distal end of the stop table (340) from the distal to the proximal inner diameter.

28. The clamping device as recited in claim 27, characterised in that the proximal end of the stop (340) is provided with an annular groove (310), the second connection (500) comprising a boss (540), the boss (540) limiting the proximal movement of the second connection (500) after abutment with the annular groove (310).