CN116585084B

CN116585084B - Support conveying device

Info

Publication number: CN116585084B
Application number: CN202310870547.6A
Authority: CN
Inventors: 陈伊璐; 徐军; 彭大冬; 韩建超; 洪晓瑜; 山鹰
Original assignee: Shanghai Rongmai Medical Technology Co ltd; Sichuan Guoyi Medical Technology Co ltd
Current assignee: Shanghai Rongmai Medical Technology Co ltd
Priority date: 2023-07-17
Filing date: 2023-07-17
Publication date: 2023-09-15
Anticipated expiration: 2043-07-17
Also published as: CN116585084A

Abstract

The invention discloses a bracket conveying device, and relates to the technical field of medical appliances. The bracket conveying device comprises a shell, a conveying pipe, an operating wheel mechanism and a locking piece. The proximal end of the delivery tube is connected to the housing. The operating wheel mechanism is rotatably arranged on the shell. An operating wheel mechanism is coupled to the delivery tube and is configured to drive a stent within the delivery tube to release from a distal end of the delivery tube. The housing includes a first sub-portion and a second sub-portion connected to the first sub-portion. The first sub-portion is configured as a hand held structure. The locking piece is movably arranged on the second sub-part. Under the condition that the locking piece moves to the first position relative to the shell, the locking piece is in limit fit with the operation wheel mechanism, and the locking piece limits the operation wheel mechanism to rotate relative to the shell. In the case where the lock member is moved to the second position, the lock member is separated from the operating wheel mechanism. The scheme is beneficial to solving the problem that the release position of the bracket is inaccurate due to the fact that the bracket conveying device is easy to touch by mistake in the use process in the related art.

Description

Support conveying device

Technical Field

The invention relates to the technical field of medical equipment, in particular to a bracket conveying device.

Background

With aging population and changes in eating habits, the incidence of lower limb arteriosclerosis increases year by year, and serious patients even experience lower limb arteriosclerosis occlusion. Treatment with interventional therapy has become an important means of curing patients. The lower limb arterial stent implantation is one of the powerful weapons for treating arteriosclerosis of lower limb, and has been widely accepted because of its ability to effectively open blood vessels, relieve pain of lower limb, and ischemic symptoms such as difficulty in walking.

The basic method for the intervention stent treatment in the arterial cavity of the lower limb is as follows: the percutaneous puncture establishes a treatment path, the guide wire/catheter establishes a working track through a lesion, the balloon expands to open a lesion vessel, the delivery system sends the stent to the lesion site through a vessel channel established by the guide wire/catheter and releases the stent, and the delivery device is withdrawn from the body after the stent is released.

In the related art, a stent release position is inaccurate due to the fact that a stent is released easily due to false touch in the using process of the conveying system for the vascular stent.

Disclosure of Invention

The invention discloses a bracket conveying device, which aims to solve the problem that in the related art, the bracket conveying device is easy to cause inaccurate bracket release position due to false touch in the use process.

In order to solve the problems, the application adopts the following technical scheme:

in a first aspect, the present application provides a stent delivery device. The bracket conveying device comprises a shell, a conveying pipe, an operating wheel mechanism and a locking piece. The proximal end of the delivery tube is connected to the housing. The operating wheel mechanism is rotatably arranged on the shell. An operating wheel mechanism is coupled to the delivery tube and is configured to drive a stent within the delivery tube to release from a distal end of the delivery tube. The housing includes a first sub-portion and a second sub-portion connected to the first sub-portion. The first sub-portion is configured as a hand held structure. The locking piece is movably arranged on the second sub-part. Under the condition that the locking piece moves to the first position relative to the shell, the locking piece is in limit fit with the operation wheel mechanism, and the locking piece limits the operation wheel mechanism to rotate relative to the shell. In the case where the lock member is moved to the second position, the lock member is separated from the operating wheel mechanism.

The technical scheme adopted by the application can achieve the following beneficial effects:

the support conveying device is provided with the locking piece, and the locking piece can prevent the operation wheel mechanism from rotating, so that the support in the conveying pipe can be released by preventing the locking piece from mistakenly touching the operation wheel mechanism. Further, the locking mechanism is provided in a second sub-portion of the housing, i.e. the locking mechanism is provided in a non-gripping portion of the housing. In the process that an operator enters and/or moves out of the body cavity channel by holding the conveying pipe in the shell operation support system, the hand of the operator can be prevented from being in contact with the locking piece, and further misoperation is prevented from pushing the locking piece to move relative to the shell, and further misoperation is prevented from unlocking the locking piece. Therefore, the stent delivery device is beneficial to preventing misoperation from releasing the stent from the distal end of the delivery tube, and is further beneficial to improving the accuracy of the stent release position.

According to some alternative embodiments, the operating wheel mechanism comprises a thumbwheel. The thumbwheel is in rotary fit with the shell, and at least part of the thumbwheel protrudes out of the outer wall of the shell. The locking piece is arranged on one side of the shell opposite to one end of the thumbwheel in the axial direction.

According to some alternative embodiments, the second sub-portion is connected to one end of the first sub-portion. The locking piece can move relative to the second sub-part in a direction away from or close to the first sub-part. The operating wheel mechanism further comprises a locking wheel, the locking wheel and the thumbwheel are coaxially arranged, and the locking wheel is connected with the thumbwheel. The outer peripheral wall of the locking wheel is provided with a limit groove. And under the condition that the locking piece moves to the first position relative to the shell, at least part of the locking piece is clamped in the limit groove on one side of the locking wheel adjacent to the first sub-part.

According to some alternative embodiments, the locking member includes a limit portion, an operating portion, and a connecting portion. The limiting part is arranged in the shell. The operating part is arranged outside the shell. The shell is provided with an avoidance groove. The connecting part penetrates through the avoiding groove and is connected with the operating part and the limiting part. The connecting part can slide along the avoiding groove. The avoidance groove has a first damping section. The groove width of the first damping section gradually decreases in the direction from the first position to the second position. In the case that the locking member moves to the first position relative to the housing, at least part of the connecting portion is located in the first damping section, and the first damping section interferes with the movement of the locking member to the second position.

According to some alternative embodiments, the relief groove has a second damping section. The groove width of the second damping section gradually decreases in the direction from the first position to the second position. In the case that the locking member moves to the second position relative to the housing, at least part of the connecting portion is located in the second damping section, and the second damping section interferes with the movement of the locking member to the first position.

According to some alternative embodiments, the housing has a first damping portion. The locking piece is provided with a second damping part. When the locking piece moves to the first position relative to the shell, the first damping portion is abutted against the second damping portion, and the first damping portion and the second damping portion can increase resistance of the locking piece to move from the first position to the second position.

According to some alternative embodiments, the stent delivery device further comprises a traction wheel, a guide wheel, and a traction rope. The traction wheel and the guide wheel are arranged at intervals. The traction wheel is connected with the operation wheel mechanism, and the operation wheel mechanism can drive the traction wheel to rotate. The guide wheel is located on a side of the traction wheel remote from the distal end of the housing. The guide wheel is tangential with the conveying pipe. One end of the traction rope is connected with the conveying pipe. The traction rope bypasses the guide wheel along the periphery of the guide wheel, and the other end of the traction rope is connected with the traction wheel.

According to some alternative embodiments, the traction sheave is coaxially disposed with the thumbwheel. The traction wheel and the guide wheel are positioned on the first side of the conveying pipe. At least part of the thumbwheel protrudes radially from the second side of the conveying pipe, and the first side of the conveying pipe and the second side of the conveying pipe are two opposite sides of the conveying pipe.

According to some alternative embodiments, the delivery tube comprises an outer tube, an ejector tube, and an inner tube. The ejection tube is sleeved on the inner tube. The outer pipe is sleeved on the top outlet pipe. The distal end of the outer tube and the distal end of the inner tube at least partially protrude from the ejector tube and form a stent-receiving cavity. The proximal end of the top outlet pipe is provided with a guide pipe section. The guide tube segment extends through the housing, and a proximal end of the guide tube segment is connected to a proximal end of the housing. The hauling cable is connected with the proximal end of the outer tube, and the hauling cable can pull the outer tube to slide along the ejector tube.

According to some alternative embodiments, the ejector tube further comprises an ejector head and a spring tube. The proximal end of the spring tube is connected to the guide tube section. The distal end of the spring tube is connected to the proximal end of the head. The outer diameter of the ejector head is adapted to the inner diameter of the outer tube. The head is slidable along the lumen of the outer tube. The external diameter of the spring tube is smaller than that of the ejection head, and an avoidance gap is formed between the spring tube and the inner wall of the outer tube.

According to some alternative embodiments, the spring tube is oriented along its proximal end toward its distal end. The pitch of the spring tube increases gradually.

According to some alternative embodiments, the spring tube comprises a plurality of sub-tube segments connected in sequence. Of the two sub-segments, the sub-segment adjacent the head has a pitch greater than the pitch of the sub-segment remote from the head.

Drawings

In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic illustration of a stent delivery device as disclosed in some alternative embodiments of the present application;

FIG. 2 is a cross-sectional view of a stent delivery device according to some alternative embodiments of the present application;

FIG. 3 is a schematic illustration of a first assembly of a latch member and a latch wheel as disclosed in some alternative embodiments of the present application;

FIG. 4 is a schematic illustration of a latch member in a first position relative to a housing as disclosed in some alternative embodiments;

FIG. 5 is a schematic illustration of some alternative embodiments of the disclosed locking member in a second position relative to the housing;

FIG. 6 is a schematic illustration of a second assembly of a latch member and a latch wheel as disclosed in some alternative embodiments of the present application;

FIG. 7 is a second schematic illustration of the latch member in a first position relative to the housing as disclosed in some alternative embodiments;

FIG. 8 is a second schematic illustration of the latch member in a second position relative to the housing as disclosed in some alternative embodiments;

FIG. 9 is a schematic illustration of the assembly of a latch with a housing in accordance with some alternative embodiments of the present application;

FIG. 10 is a schematic illustration of a latch member moving relative to a housing to a first damping segment as disclosed in some alternative embodiments of the present application;

FIG. 11 is a schematic illustration of a latch member moving relative to a housing to a second damping segment as disclosed in some alternative embodiments of the present application;

FIG. 12 is a schematic view of a latch according to some alternative embodiments of the present application moved to a first position relative to a housing, with a first damping portion abutting a second damping portion;

FIG. 13 is a schematic view of a latch according to some alternative embodiments of the present application moved to a second position relative to a housing, with a first damping portion abutting a second damping portion;

FIG. 14 is a second cross-sectional view of a stent delivery device according to some alternative embodiments of the present application;

FIG. 15 is an assembly view of an operating wheel mechanism and traction wheel as disclosed in some alternative embodiments of the present application;

FIG. 16 is a schematic illustration of the transmission in a stent delivery device as disclosed in some alternative embodiments of the present application;

FIG. 17 is a schematic illustration of a non-return wheel and non-return member as disclosed in some alternative embodiments of the present application;

FIG. 18 is a schematic illustration of a roof tube disclosed in some alternative embodiments of the present application;

FIG. 19 is a schematic view of a delivery tube as disclosed in some alternative embodiments of the application;

fig. 20 is a schematic view of a carrier mounted within a delivery tube as disclosed in some alternative embodiments of the present application.

Reference numerals illustrate:

10-a bracket; 100-a housing; 110-a first sub-section; 120-a second sub-section; 121-a receiving groove; 130-avoiding grooves; 131-a first damping section; 132-a second damping section; 140-a first damping portion; 150-a guide; 200-conveying pipes; 210-an outer tube; 220-ejecting the pipe; 221-guiding pipe section; 222-a top head; 223-spring tube; 224-skin; 230-an inner tube; 231-a positioning head; 240-a stent containment lumen; 300-operating a wheel mechanism; 310-thumbwheel; 320-locking wheel; 321-a limit groove; 330-a rotating shaft; 340-a non-return wheel; 400-locking piece; 410-a limit part; 420-an operation part; 430-a connection; 440-a second damping portion; 500-traction wheels; 510-Rong Xiancao; 600-guide wheels; 700-hauling rope; 800-backstop; 900-interface piece.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail below. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, based on the examples herein, which are within the scope of the application as defined by the claims, will be within the scope of the application as defined by the claims.

The terms first, second and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged, as appropriate, such that embodiments of the present application may be implemented in sequences other than those illustrated or described herein, and that the objects identified by "first," "second," etc. are generally of a type, and are not limited to the number of objects, such as the first object may be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.

In various embodiments of the present application, "proximal" and "distal" refer to stent delivery devices and their accessories in the use environment, relative to the user's proximal-distal position, wherein the end closer to the user is designated as the "proximal end" and the end farther from the user is designated as the "distal end".

In the related art, the locking structure of the stent delivery device is arranged in the region where the index finger of the handle is held, so that the locking structure is pressed by the index finger to lock or unlock the stent delivery device. The inventors have found that during use, the operator grasps the handle region and needs to manipulate the handle to bring the delivery conduit of the delivery system into the intra-body lumen. Because of the need to apply force through the handle portion during insertion of the delivery tube into the body. In order to be able to apply a better force, the operator easily increases the grip force of the grip handle and thus easily triggers the unlocking of the locking structure. In addition, in the process of inserting the conveying pipeline into the body, the thumb of the operator approaches and/or presses on the operation wheel, so that the operator can easily touch the operation wheel by mistake to rotate, further, the bracket is released by mistake, and the accuracy of bracket release is reduced.

The application provides a conveying system aiming at the technical problems. The conveying system comprises a shell, a locking piece, an operation wheel mechanism and a conveying pipe. The operating wheel mechanism is rotatably arranged in the shell. An operating wheel mechanism is coupled to the delivery tube and is configured to drive a stent within the delivery tube to release from a distal end of the delivery tube. Specifically, the operating wheel mechanism may be operated to rotate relative to the housing such that the operating wheel mechanism drives the stent within the delivery tube to release from the distal end of the delivery tube. The locking member is disposed in the housing in a non-gripping area. Wherein the non-gripping area is the area not covered by the operator's hand during insertion of the delivery system into the body. In this way, the delivery system can prevent false triggers from releasing the stent within the delivery tube. Therefore, the locking piece can be unlocked after the bracket is moved to the preset position, and the bracket in the conveying pipe is released by rotating the operating wheel mechanism relative to the shell, so that the accuracy of the releasing position of the bracket is ensured.

The following describes in detail the stent delivery device provided in the embodiment of the present application by means of specific embodiments and application scenarios thereof with reference to fig. 1 to 20.

The application provides a stent conveying device. By way of example, the stent delivery device may be used, but is not limited to, for delivering a vascular stent to a designated location within the body, for which the present embodiment is not limited to the particular type of stent delivered by the stent delivery device.

Referring to fig. 1 to 3, the stent delivery device includes a housing 100, a delivery tube 200, an operating wheel mechanism 300, and a locking member 400. Wherein the housing 100 is a basic structural member that may provide a mounting basis for other components. Alternatively, the housing 100 may be configured to accommodate the structure of an operator's hand to facilitate the operator's gripping of the housing 100.

Referring to fig. 1 to 3, a proximal end of the delivery tube 200 is connected to the housing 100. The operation wheel mechanism 300 is rotatably provided to the housing 100. In some alternative embodiments, as shown in fig. 3, the housing 100 has a mounting cavity. At least a portion of the operating wheel mechanism 300 is located within the mounting cavity. Illustratively, the operating wheel mechanism 300 also includes a rotating shaft 330. The operating wheel mechanism 300 is rotatably coupled to the housing 100 via a rotation shaft 330.

Referring to fig. 2 and 3, in some alternative embodiments, an operating wheel mechanism 300 is coupled to the delivery tube 200, and the operating wheel mechanism 300 is configured to drive the stent within the delivery tube 200 to release from the distal end of the delivery tube 200. Illustratively, the operating wheel mechanism 300 is drivingly coupled to the delivery tube 200 to drive the release of the stent within the delivery tube 200 from the distal end of the delivery tube 200 via the operating wheel mechanism 300. Illustratively, in the present embodiment, the operating wheel mechanism 300 may be, but is not limited to being, a rack and pinion connection transmission with the delivery tube 200.

Referring to fig. 1, the case 100 includes a first sub-portion 110 and a second sub-portion 120 connected to the first sub-portion 110. The first sub-portion 110 is configured as a palm gripping structure. Illustratively, the operator holds the first sub-portion 110 during the operator's manipulation of the delivery tube 200 into the body. Specifically, the first sub-portion 110 is configured to adapt to the structural features of the palm, so as to facilitate the operator to hold the first sub-portion 110, and improve the comfort of the operator to hold the first sub-portion 110.

In some alternative embodiments, the first sub-portion 110 has a recess that fits the palm to facilitate the fitting of the first sub-portion 110 to the palm, and to enhance the comfort of the operator holding the first sub-portion 110. Illustratively, the first sub-portion 110 has a groove that fits with a finger to improve the stability of the operator's grip on the housing 100.

Referring to fig. 1, the locking member 400 is movably disposed on the second sub-portion 120. In this way, the operator cannot touch the locking piece 400 when holding the housing 100 to operate the conveying pipe 200 and enter the body, so that the locking piece 400 is prevented from moving relative to the housing 100 due to the fact that the locking piece 400 is touched by mistake, and the locking piece 400 is prevented from being unlocked by mistake.

Illustratively, the latch 400 is switchable between a first position and a second position relative to the housing 100. Illustratively, in the case where the locking member 400 moves to the first position relative to the housing 100, the locking member 400 is in a positive engagement with the operating wheel mechanism 300, and the locking member 400 limits rotation of the operating wheel mechanism 300 relative to the housing 100. In the case where the lock 400 is moved to the second position, the lock 400 is separated from the operation wheel mechanism 300. Specifically, the locking member 400 is separated from the operating wheel mechanism 300, i.e., the limit fit between the locking member 400 and the operating wheel mechanism 300 is released. In this way, the operation wheel mechanism 300 can be locked or unlocked by moving the toggle lock 400 with respect to the housing 100.

In some alternative embodiments, the locking member 400 may be movable or rotatable relative to the housing 100 to effect that the locking member 400 may be switched between a first position and a second position relative to the housing 100. For this reason, the present embodiment does not limit the specific manner in which the locking member 400 moves relative to the housing 100.

Referring to fig. 4 and 5, in some alternative embodiments, the outer wall of the housing 100 is provided with a receiving groove 121. Illustratively, at least a portion of the locking member 400 is positioned within the receiving groove 121, and the locking member 400 is slidable within the receiving groove 121. In an alternative embodiment, the width of the locking member 400 is adapted to the width of the accommodating groove 121, so that the locking member 400 can be slidably matched with the groove wall of the accommodating groove 121, thereby improving the stability of the movement of the locking member 400 relative to the housing 100. The width direction of the locking member 400 is the direction shown by the y-axis in fig. 4 or 5. In addition, the sliding engagement of the locking member 400 with the groove wall of the receiving groove 121 is also beneficial for improving the compactness of the assembly of the locking member 400 with the housing 100, and for preventing external dust from entering the housing 100 from the locking member 400.

In some alternative embodiments, the latch 400 is flush with the outer wall of the housing 100. Alternatively, the locking member 400 is trapped in the outer wall of the housing 100. This is beneficial for preventing the latch 400 from being touched by mistake, and thus for preventing the latch 400 from being moved to the second position by being touched by mistake, and thus for avoiding the operation wheel mechanism 300 from being unlocked by mistake.

Referring to fig. 4 and 5, in some alternative embodiments, at least a portion of the locking member 400 is stopped against a first end of the receiving groove 121 in a length direction in the case that the locking member 400 is moved to the first position with respect to the housing 100. When the locking member 400 moves to the second position with respect to the housing 100, at least a portion of the locking member 400 is abutted against the second end of the accommodating groove 121 in the longitudinal direction. The length direction of the accommodating groove 121 may be the direction shown by the x-axis in fig. 4 or fig. 5.

In the above embodiment, the locking member 400 can be stopped by two ends of the accommodating groove 121 in the length direction, so that the locking member 400 can be accurately stopped at the first position or the second position. In addition, the locking piece 400 can be pushed against the end of the accommodating groove 121 to give a touch to an operator, so that the operator can accurately sense whether the locking piece 400 and the operating wheel mechanism 300 have moved to the first position or the second position.

Referring to fig. 2-4, the thumbwheel mechanism 300 includes a thumbwheel 310. The thumbwheel 310 is rotatably engaged with the housing 100, and at least a portion of the thumbwheel 310 protrudes from the outer wall of the housing 100 to rotate the thumbwheel 310 relative to the housing 100 by toggling the thumbwheel 310. In some alternative embodiments, the peripheral wall of the thumbwheel 310 has anti-slip grooves to increase friction between the thumbwheel 310 and the finger to facilitate rotation of the thumbwheel 310 relative to the housing 100.

Referring to fig. 2 and 3, the locking member 400 is provided at a side of the housing 100 opposite to one end of the thumbwheel 310 in the axial direction. In some alternative embodiments, the lock 400 is located on one side of the thumbwheel 310 in the axial direction. Illustratively, with the operator holding the housing 100, the first side of the housing 100 is in engagement with the palm of the hand. The locking member 400 is disposed on the second side of the housing 100. The second side of the housing 100 and the first side of the housing 100 are opposite sides of the housing 100.

In the above embodiment, the locking member 400 is located on the side wall of the housing 100, so that it is beneficial to prevent an operator from touching the locking member 400 during the process of inserting the delivery tube 200 into the body, so as to avoid that the locking member 400 is unlocked by mistake due to touching the locking member 400 by mistake. In addition, the locking member 400 is disposed at a side of the housing 100 away from the palm, so that the locking member 400 can be located at a gap between the end of the finger and the palm, which is beneficial to increase the convenience of operating the locking member 400.

In some alternative embodiments, the second sub-portion 120 is connected to one end of the first sub-portion 110 in the first direction. Illustratively, the first direction is a direction from a proximal end of the first sub-portion 110 to a distal end of the first sub-portion 110. Specifically, the first direction may be the opposite direction as shown by the x-axis in fig. 2. Illustratively, the second sub-portion 120 is disposed adjacent to the distal end of the first sub-portion 110. During operation of the delivery system by the operator, one side of the operator's thumb is adjacent the distal end of the first sub-portion 110 to facilitate insertion of the delivery tube 200 into the body by the operator's force applied by the housing 100.

Referring to fig. 4 and 5, in some alternative embodiments, the locking member 400 may be movable relative to the second sub-portion 120 in a direction away from or toward the first sub-portion 110. Illustratively, the latch 400 moves relative to the housing 100 in the extending direction of the housing 100. The extending direction of the housing 100 is the direction shown by the x-axis in fig. 4 and 5. This is beneficial for pushing the latch 400 relative to the housing 100 by thumb force.

Referring to fig. 1-3, in some alternative embodiments, during operation of the delivery tube 200 into the human body, a hand is held against the housing 100 and a thumb is engaged against the thumbwheel 310 to facilitate control of the direction of insertion and control of the amount of force pushing the delivery tube 200. After the delivery tube 200 is moved to the preset position, the thumb can be deflected toward the side of the housing 100 facing away from the palm, i.e., by deflecting the thumb so that the thumb can seat against the lock 400, and by pushing the lock 400 relative to the housing 100 by the thumb, the separation between the operating wheel mechanism 300 and the lock 400 can be achieved. The thumb is then deflected to bear against the thumbwheel 310 to facilitate rotation of the wheel mechanism 300 relative to the housing 100 by the thumb pulling to release the stent within the delivery tube 200.

Referring to fig. 2 and 3, the operating wheel mechanism 300 further includes a locking wheel 320. The locking wheel 320 is coaxially disposed with the thumbwheel 310, and the locking wheel 320 is coupled to the thumbwheel 310. Illustratively, the latch wheel 320 and the thumbwheel 310 may be coupled by a shaft 330 such that the latch wheel 320 and thumbwheel 310 rotate synchronously about the shaft 330. As some alternative embodiments, the latch wheel 320 and thumbwheel 310 may be coupled to a rotational limit of the shaft 330. Illustratively, the latch wheel 320 and the thumbwheel 310 are each fixedly coupled to the shaft 330 to limit the thumbwheel 310 from rotating about the shaft 330 by limiting the rotation of the latch wheel 320.

Referring to fig. 3, in some alternative embodiments, the outer peripheral wall of the locking wheel 320 has a limit groove 321. Illustratively, the latch wheel 320 has a plurality of limiting grooves 321 thereon. Alternatively, a plurality of limiting grooves 321 are provided at intervals along the outer circumferential wall of the locking wheel 320 so that the locking member 400 can be in limiting engagement with a plurality of positions of the locking wheel 320. Illustratively, the latch wheel 320 may be a gear.

Referring to fig. 3, in some alternative embodiments, with the latch 400 moved to the first position relative to the housing 100, at least a portion of the latch 400 snaps into the retaining groove 321 on the side of the latch wheel 320 remote from the first sub-portion 110. Illustratively, the latch 400 is located on a side of the latch wheel 320 remote from the first sub-portion 110. In an alternative embodiment, the locking member 400 moves radially relative to the housing 100 along the locking wheel 320 such that the locking member 400 is either away from or near the locking wheel 320.

Referring to fig. 4 and 5, during the operation of the stent delivery device by the operator to insert the delivery tube 200 into the body, the operator pushes the housing 100 along the proximal end of the housing 100 toward the distal end of the housing 100. After the delivery tube 200 reaches the preset position in the body, the thumb can be adjusted to lean against the locking piece 400, and the locking piece 400 is pushed to move away from the first sub-portion 110, so that the locking piece 400 is separated from the locking wheel 320, and the locking piece 400 is unlocked from the locking wheel 320.

Referring to fig. 6, in alternative embodiments, with the latch 400 moved to the first position relative to the housing 100, at least a portion of the latch 400 snaps into the retaining groove 321 on a side of the latch wheel 320 adjacent to the first sub-portion 110. Illustratively, the latch 400 is located on a side of the latch wheel 320 adjacent the first sub-portion 110. Alternatively, the locking member 400 moves radially with respect to the housing 100 along the locking wheel 320 such that the locking member 400 is spaced apart from or adjacent to the locking wheel 320.

Referring to fig. 7 and 8, during the operation of the stent delivery device by the operator to insert the delivery tube 200 into the body, the operator pushes the housing 100 along the proximal end of the housing 100 toward the distal end of the housing 100. In this way, even if the operator touches the locking piece 400 by mistake during insertion of the delivery tube 200 into the body, the generated force pushes the locking piece 400 in a direction approaching the locking wheel 320. I.e. in this case the locking member 400 is more firmly in a positive engagement with the locking wheel 320. Thus, this embodiment is useful for preventing the lock 400 from being erroneously unlocked from the operation wheel mechanism 300.

In some alternative embodiments, as shown in fig. 9, the locking member 400 includes a limiting portion 410, an operating portion 420, and a connecting portion 430. The limiting portion 410 is disposed in the housing 100. The operation portion 420 is disposed outside the housing 100, and illustratively, the operation portion 420 is disposed in the accommodating groove 121, and the width of the operation portion 420 is adapted to the width of the accommodating groove 121, so that the operation portion 420 can slide along the accommodating groove 121.

Referring to fig. 9, the housing 100 has a relief groove 130. Illustratively, the escape groove 130 penetrates a wall of the housing 100 to communicate an inner space of the housing 100 with an outer space of the housing 100. The connection part 430 penetrates the escape groove 130 and connects the operation part 420 and the limit part 410. The connection part 430 may slide along the escape groove 130.

In some alternative embodiments, the size of the operation part 420 and the limit part 410 in the groove width direction of the escape groove 130 is greater than the size of the connection part 430 in the groove width direction of the escape groove 130. In a further alternative embodiment, the dimension of the connection part 430 in the groove width direction of the escape groove 130 is adapted to the groove width of the escape groove 130 so that the connection part 430 can slide along the escape groove 130. In some alternative embodiments, the locking member 400 may be snap-fit into the relief groove 130 of the housing 100 to prevent the locking member 400 from being separated from the housing 100.

In some alternative embodiments, the thickness of the stopper 410 gradually decreases along an end of the stopper 410 away from the center of the locking wheel 320 toward an end of the stopper 410 near the center of the locking wheel 320. This is beneficial for the insertion of the stop portion 410 into the stop slot 321. In some alternative embodiments, stop 410 is provided with a guide surface adjacent one end near the center of latch wheel 320. In this way, in the case that an end of the limiting part 410 adjacent to the center near the locking wheel 320 is not aligned with the middle of the limiting groove 321, the guiding surface may be used to interact with the groove wall of the limiting groove 321, so that the limiting part 410 is embedded into the limiting groove 321, so as to ensure that the locking part 410 may be locked with the locking wheel 320 by embedding into the limiting groove 321. Illustratively, the stop 410 has an arcuate guide surface adjacent an end near the center of the latch wheel 320.

In some alternative embodiments, the width of limiting groove 321 gradually decreases in the direction of the notch of limiting groove 321 toward the bottom of limiting groove 321. In some further alternative embodiments, the groove width of the limiting groove 321 is adapted to the thickness of the limiting portion 410. In some alternative embodiments, when the locking member 400 moves to the first position relative to the housing 100, two sidewalls of the limiting portion 410 in the thickness direction are respectively abutted against the groove walls of the limiting groove 321, so as to improve the stability of the locking wheel 320 after the locking wheel 320 is in limiting fit with the locking member 400.

In some alternative embodiments, as shown in fig. 9, the inner wall of the housing 100 is provided with a guide 150. Illustratively, the guide 150 has a guide surface. At least a portion of the locking member 400 abuts against the guide surface of the guide portion 150, and the locking member 400 is switchable between a first position and a second position along the guide surface of the guide portion 150 relative to the housing 100. The guide portion 150 can provide support for the locking member 400, and is further beneficial to transferring the force transmitted from the locking wheel 320 to the locking member 400 to the housing 100, so as to reduce the bending stress of the locking member 400, and achieve the purpose of protecting the locking member 400.

In some alternative embodiments, two guides 150 are provided spaced apart from the inner wall of the housing 100. The two guide portions 150 respectively abut against two sides of the limiting portion 410, so as to respectively provide support for two sides of the limiting portion 410, thereby improving the reliability of assembling the locking member 400 and the housing 100. Illustratively, the guide 150 may be a protrusion protruding from the inner wall of the housing 100.

Referring to fig. 10 and 11, the avoidance groove 130 has a first damping segment 131, and the first damping segment 131 is beneficial to increasing the resistance of the locking member 400 to the movement of the locking member 400 relative to the housing 100 during the movement of the locking member 400 from the first position to the second position, thereby being beneficial to keeping the locking member 400 in a limited engagement with the operating wheel mechanism 300.

In some alternative embodiments, the direction is along the first position to the second position. The groove width of the first damping segment 131 gradually decreases. In the case that the locking member 400 moves to the first position with respect to the housing 100, at least part of the connection part 430 is located at the first damping segment 131, and the first damping segment 131 interferes with the movement of the locking member 400 to the second position. Illustratively, during movement of the locking member 400 from the first position to the second position relative to the housing 100, the frictional resistance between the connecting portion 430 and the first damping segment 131 increases gradually, thereby helping to hinder movement of the interference locking member 400 from the first position to the second position relative to the housing 100.

Referring to fig. 10 and 11, in some further alternative embodiments, the thickness of the connection portion 430 in the width direction of the escape groove 130 is gradually reduced in the direction from the first position to the second position. The direction along the first position to the second position may be the opposite direction to the direction shown by the x-axis in fig. 10 and 11.

In the above embodiment, the avoiding groove 130 can increase the resistance of the locking member 400 moving from the first position to the second position by providing the first damping section 131, so as to be beneficial to maintaining the locking state between the locking member 400 and the operation wheel mechanism 300, and further to prevent the locking state from being unpredictably released between the locking member 400 and the operation wheel mechanism 300, and avoid the erroneous release of the stent in the delivery tube 200. Wherein the locked state, i.e., the state in which the locking member 400 is in the first position relative to the housing 100, is in positive engagement with the operating wheel mechanism 300.

According to some alternative embodiments, referring to fig. 10 and 11, the relief groove 130 has a second damping segment 132. Illustratively, the second damper segment 132 communicates with the first damper segment 131. Illustratively, the second damper segment 132 is beneficial for increasing resistance to movement of the latch 400 relative to the housing 100 during movement of the latch 400 from the second position to the first position, thereby helping to maintain the latch 400 in a disengaged condition from the operating wheel mechanism 300.

In some alternative embodiments, the groove width of the second damping segment 132 gradually decreases in the direction from the first position to the second position. In the case that the locking member 400 moves to the second position with respect to the housing 100, at least part of the connection portion 430 is located at the second damping section 132, and the second damping section 132 interferes with the movement of the locking member 400 to the first position.

According to some alternative examples, the junction of the second damping segment 132 and the first damping segment 131 forms a stepped structure. With the locking member 400 in the second position, an end of the connecting portion 430 adjacent to the first damping segment 131 at least partially abuts against the step structure to prevent the locking member 400 from moving toward the first position relative to the housing 100.

In the above embodiment, the avoidance groove 130 can increase the resistance of the locking member 400 moving from the second position to the first position by providing the second damping section 132, which is beneficial to keeping the locking member 400 and the operation wheel mechanism 300 in an unlocked state, and is beneficial to preventing the locking member 400 and the operation wheel mechanism 300 from being in an unpredictably locked state, and avoiding the false locking of the operation wheel mechanism 300 during the releasing of the stent in the conveying pipe 200, so as to ensure the smoothness during the releasing of the stent, and is beneficial to improving the accuracy of the stent position.

Referring to fig. 10 to 13, in some alternative embodiments, the housing 100 has a first damping portion 140. The locking member 400 has a second damping portion 440. When the locking member 400 moves to the first position relative to the housing 100, the first damping portion 140 abuts against the second damping portion 440, and the first damping portion 140 and the second damping portion 440 can increase the resistance of the locking member 400 moving from the first position to the second position. Illustratively, one of the first and second damping portions 140 and 440 may be a convex structure, and the other may be a groove or convex structure adapted thereto.

Referring to fig. 10, the first damping portion 140 and the second damping portion 440 are both of a convex structure. In some alternative embodiments, the first damping portion 140 is a protrusion disposed on a wall of the relief groove 130. The second damping portion 440 is a protrusion provided at a sidewall of the connection portion 430. When the locking member 400 moves to the first position with respect to the housing 100, the second damping portion 440 abuts against a side of the first damping portion 140 away from the second position, so that the resistance to the movement of the locking member 400 from the first position to the second position is increased by the abutting of the first damping portion 140 and the second damping portion 440.

In some alternative embodiments, the first damping portion 140 abuts the second damping portion 440 when the locking member 400 moves to the second position relative to the housing 100, and the first damping portion 140 and the second damping portion 440 may increase the resistance of the locking member 400 to move from the second position to the first position. In this way, the second damper portion 440 can abut against the first damper portion 140 on the housing 100 to prevent the lock member 400 and the operation wheel mechanism 300 from being unpredictably unlocked, thereby avoiding erroneous release of the rack in the delivery tube 200.

According to some alternative embodiments, referring to fig. 12 and 13, two sets of second damping portions 440 are provided on the locking member 400. At least one set of first damping portions 140 is provided on the housing 100. Referring to fig. 12, in the case where the locking member 400 moves to the first position with respect to the housing 100, one set of second damping portions 440 in the locking member 400 abuts against one side of the first damping portion 140 on the housing 100, which is away from the second position. In the case that the locking member 400 moves to the second position relative to the housing 100, the other set of second damping portions 440 in the locking member 400 abuts against one side of the first damping portions 140 on the housing 100, which is far from the first position. This allows the locking member 400 to be maintained in the first and second positions with respect to the housing 100 by the first and second damping portions 140 and 440, thereby facilitating the locking member 400 to be maintained in the locked or unlocked state with the operating wheel mechanism 300 for accurate release of the stent within the delivery tube 200.

In some alternative embodiments, the thickness of the connection part 430 in the width direction of the escape groove 130 is uniform along the direction of the first position toward the second position, and the locking member 400 and the housing 100 may be maintained in the first position or the second position by the first damping part 140 and the second damping part 440, thereby facilitating the maintenance of the locking state or the unlocking state between the locking member 400 and the operating wheel mechanism 300. Wherein, the locking piece 400 and the operation wheel mechanism 300 are kept in a locking state, namely, the locking piece 400 and the operation wheel mechanism 300 rotate to limit. The locking member 400 is maintained in an unlocked state with the operation wheel mechanism 300, i.e., the locking member 400 is separated from the operation wheel mechanism 300 so that the operation wheel mechanism 300 can rotate relative to the housing 100.

Referring to fig. 14 and 16, according to some alternative embodiments, the stent delivery device further includes a traction wheel 500, a guide wheel 600, and a traction rope 700. The traction wheel 500 is spaced apart from the guide wheel 600. For example, the traction wheel 500 and the guide wheel 600 may be spaced apart along the extension direction of the delivery tube 200. Alternatively, the direction of extension of the delivery tube 200 may be the direction shown by the x-axis in fig. 14. Illustratively, traction wheel 500 is more proximal to the distal end of housing 100 than guide wheel 600.

Referring to fig. 15, in some alternative embodiments, traction wheel 500 is coupled to steering wheel mechanism 300, and steering wheel mechanism 300 may rotate traction wheel 500. For example, the traction wheel 500 may be disposed on the rotation shaft 330. Illustratively, the traction wheel 500 is in rotational limit engagement with the shaft 330 such that the traction wheel 500 may rotate with the shaft 330. For example, traction wheel 500 may be fixedly coupled directly to thumbwheel 310 to rotate traction wheel 500 via thumbwheel 310. Referring to fig. 15, in some alternative embodiments, traction wheel 500 may be integral with operating wheel mechanism 300.

Referring to fig. 14, the guide wheel 600 is positioned on the side of the traction wheel 500 remote from the distal end of the housing 100, the guide wheel 600 being tangential to the delivery tube 200. In some alternative embodiments, the proximal end of delivery tube 200 extends through housing 100 in the direction of extension of housing 100. The extending direction of the housing 100 may be, for example, the direction shown by the x-axis in fig. 14. Illustratively, the proximal end of delivery tube 200 is tangential to guide wheel 600. One end of the pull-cord 700 is connected to the delivery tube 200. The traction rope 700 guides the wheel 600 along the outer Zhou Raoguo of the guide wheel 600, and the other end of the traction rope 700 is connected to the traction wheel 500.

In some alternative embodiments, the peripheral walls of traction wheel 500 and guide wheel 600 are each provided with a wire-receiving slot 510. Illustratively, traction rope 700 is wrapped around traction wheel 500 and/or guide wheel 600 along wire-receiving channel 510. In some alternative embodiments, at least a portion of the delivery tube 200 is positioned within the wire receiving groove 510 of the traction wheel 500 and/or the guide wheel 600, thereby advantageously ensuring that the traction rope 700 pulls the delivery tube 200 in the extension direction of the delivery tube 200, and also advantageously reducing the force pulling the delivery tube 200 and improving the accuracy of the stent release position by guiding the movement of the delivery tube 200 with the wire receiving groove 510.

Illustratively, during delivery of the stent into the body, at least a portion of the pull cord 700 may be wrapped around the traction wheel 500 by rotating the traction wheel 500, thereby pulling the delivery tube 200 so that the stent within the delivery tube 200 may be released from the distal end of the delivery tube 200.

In the stent delivery device provided in the above embodiment, the extending direction of the traction rope 700 can be changed by using the guide wheel 600, so that the space of the housing 100 can be fully utilized, and the movement stroke of the release stent can be reduced.

Referring to fig. 17, in some alternative embodiments, the stent delivery device further comprises a backstop 800. Optionally, the backstop 800 is disposed on the housing 100. The operating wheel mechanism 300 also includes a non-return wheel 340. The non-return wheel 340 is connected to the thumbwheel 310 such that the thumbwheel 310 can rotate the non-return wheel 340. In some alternative embodiments, the outer circumference of the non-return wheel 340 is provided with non-return grooves. For example, the backstop groove may be in positive engagement with the backstop 800 such that the backstop 800 may resist rotation of the backstop wheel 340. Specifically, in the process of operating the thumbwheel 310 to rotate to drive the delivery tube 200 to release the stent 10, the thumbwheel 310 can drive the non-return wheel 340 to rotate towards the first time needle direction. The check 800 may prevent the check wheel 340 from rotating in the second clockwise direction. The second hour hand is opposite to the first hour hand.

Illustratively, the ratchet wheel 340 may be, but is not limited to being, a ratchet wheel. The ratchet wheel 340 may form a ratchet mechanism with the ratchet 800.

Referring to fig. 15, as a further alternative embodiment, the ratchet wheel 340 and the locking wheel 320 are located on axially opposite sides of the thumbwheel 310, respectively. Alternatively, the ratchet wheel 340, the locking wheel 320 and the thumbwheel 310 are coaxially disposed, and the thumbwheel 310 has a diameter greater than the ratchet wheel 340 and the locking wheel 320. In this way, the check member 800 and the locking wheel 320 can be separated by the thumbwheel 310, so that the interference between the check member 800 and the check wheel 340 is avoided, and the stability of the stent delivery device is improved.

According to some alternative embodiments, referring to fig. 15, traction wheel 500 is disposed coaxially with thumbwheel 310. Illustratively, the traction sheave 500 is fixedly disposed on the rotating shaft 330. Referring to fig. 14, traction wheel 500 and guide wheel 600 are located on a first side of delivery tube 200. The thumbwheel 310 radially protrudes at least partially from the second side of the delivery tube 200. The first side of the delivery tube 200 and the second side of the delivery tube 200 are radially opposite sides of the delivery tube 200. Illustratively, the portion of the thumbwheel 310 on the second radial side of the delivery tube 200 protrudes from the housing 100 to facilitate rotation of the thumbwheel 310. In some alternative embodiments, the direction of the linear velocity of the portion of the thumbwheel 310 protruding from the housing 100 is the second direction during release of the stent 10 within the delivery tube 200. Wherein the second direction is a direction toward the proximal end of the housing 100. Illustratively, the second direction is the direction shown by the x-axis in fig. 14.

In the above embodiment, the rotation centers of the traction wheel 500 and the guide wheel 600 and the parts of the thumbwheel 310 protruding from the housing 100 are respectively located at two opposite sides of the conveying pipe 200, which is beneficial to reducing the volume of the housing 100, and is beneficial to enabling the parts of the thumbwheel 310 protruding from the housing 100 to be flush with the first sub-part 110 held by the hand, so that the thumbs of the operator can apply force to rotate the thumbwheel 310, and further is beneficial to reducing the difficulty of releasing the bracket 10.

In some further alternative embodiments, the direction of the linear velocity of the portion of the thumbwheel 310 protruding from the housing 100 is the second direction during the release of the stent 10 in the delivery tube 200, so as to ensure that the direction of movement of the delivery tube 200 is consistent with the direction of the linear velocity of the portion of the thumbwheel 310 protruding from the housing 100, both along the extending direction of the delivery tube 200 toward the proximal end of the delivery tube 200, thereby facilitating the user to operate the release of the stent in the delivery tube 200. In addition, the traction rope 700 can be arranged along the inner wall of the inner cavity of the shell 100, so that a sufficient avoiding space can be formed for the middle part of the shell 100, and other parts can be conveniently installed. Illustratively, it may be beneficial to deploy the ratchets 800 and/or the latches 400, etc. within the housing 100 to avoid interference of the pull-cord 700 with other components within the housing 100.

In some alternative embodiments, traction wheel 500 is disposed between non-return wheel 340 and thumbwheel 310. Illustratively, one axial end of the traction wheel 500 is attached to one axial end of the thumbwheel 310 to reduce the distance between the traction wheel 500 and the thumbwheel 310, thereby reducing the torque received by the rotating shaft 330 and improving the stability of the assembly of the operating wheel mechanism 300 and the housing 100.

According to some alternative embodiments, referring to fig. 19 and 20, delivery tube 200 includes an outer tube 210, an ejector tube 220, and an inner tube 230. The top outlet pipe 220 is sleeved on the inner pipe 230. Outer tube 210 is sleeved on top tube 220. The distal end of outer tube 210 and the distal end of inner tube 230 at least partially protrude beyond top tube 220 and form a stent-receiving cavity 240. Illustratively, the stent 10 is mounted within the stent-receiving chamber 240.

Referring to fig. 14, 16 and 18, the proximal end of the top outlet tube 220 is provided with a guide tube segment 221. Guide tube segment 221 extends through housing 100, and a proximal end of guide tube segment 221 is connected to a proximal end of housing 100. Illustratively, pull-cord 700 is coupled to the proximal end of outer tube 210, and pull-cord 700 may pull outer tube 210 to slide along ejector tube 220.

In some alternative embodiments, the proximal end of the housing 100 is provided with an interface 900. Optionally, the proximal end of guide tube segment 221 is fixedly attached to interface 900. In this way, outer tube 210 may be guided by guide tube segment 221, thereby advantageously reducing the resistance of pull cable 700 to pull outer tube 210 relative to ejector tube 220, thereby reducing the difficulty of releasing stent 10.

In some alternative embodiments, inner tube 230 further includes a tube body and a spacing head 231, illustratively, spacing head 231 is disposed at the distal end of the tube body. Referring to fig. 19, the diameter of the spacing head 231 gradually decreases along the proximal end of the spacing head 231 toward the distal end of the spacing head 231. In a further alternative embodiment, the proximal end of the spacing head 231 has a diameter greater than the diameter of the tube such that the spacing head 231 forms a spacing step at the junction with the tube. Referring to fig. 20, the distal end of the stent 10 abuts against the portion of the proximal section of the stopper 231 protruding from the outer circumferential wall of the tube body.

In the above embodiment, the limiting head 231 can prevent the stent 10 from moving out of the stent accommodating cavity 240, avoid the erroneous release of the stent, and improve the accuracy of the stent release position.

Referring to fig. 18 and 19, ejector tube 220 further includes an ejector head 222 and a spring tube 223. The proximal end of spring tube 223 is connected to guide tube segment 221. The distal end of spring tube 223 is connected to the proximal end of ejector head 222. The spring tube 223 may be used to not only provide support for the release of the stent 10 from the distal end of the outer tube 210, but also to provide support for the inner tube 230 to prevent collapse of the inner tube 230. In addition, the spring tube 223 has better bending properties to enable the delivery tube 200 to better accommodate the path of the body lumen, thereby advantageously improving the smoothness of the delivery tube 200 entering the lumen.

In some alternative embodiments, referring to fig. 19, the outer diameter of ejector head 222 is adapted to the inner diameter of outer tube 210, and ejector head 222 is slidable along the lumen of outer tube 210. Illustratively, the width of the gap formed between the outer peripheral wall of the head 222 and the inner peripheral wall of the outer tube 210 is smaller than the thickness of the stent 10 in the radial direction of the outer tube 210. In some alternative embodiments, the peripheral wall of the top head 222 may be a sliding fit with the inner wall of the inner tube 230. In this way, the distal end face of head 222 may abut the proximal end of stent 10, thereby facilitating the movement of stent 10 relative to outer tube 210 by head 222.

In some alternative embodiments, referring to fig. 18 and 19, the outer diameter of spring tube 223 is smaller than the outer diameter of ejector head 222, and a relief gap is formed between spring tube 223 and the inner wall of outer tube 210.

The above-described embodiments are beneficial for reducing frictional resistance between outer tube 210 and spring tube 223, and thus for reducing resistance to proximal movement of outer tube 210 relative to ejector tube 220 toward ejector tube 220, to reduce the difficulty of releasing stent 10 from the distal end of delivery tube 200.

In some alternative embodiments, top exit tube 220 also includes a skin 224. Illustratively, the skin 224 is wrapped around the outer peripheral wall of the spring tube 223. Optionally, a back-off gap exists between the outer perimeter wall of skin 224 and the inner perimeter wall of outer tube 210.

The above-described embodiments are beneficial for further reducing the frictional forces between outer tube 210 and ejector tube 220, and thus for reducing drag during release of stent 10.

In some alternative embodiments, the pitch of the spring tube 223 increases gradually along the proximal end of the spring tube 223 toward the distal end of the spring tube 223. The inventors have found that in implementing the stent delivery device provided by the present application, the axial force applied to the spring tube 223 is gradually reduced along the proximal end of the spring tube 223 toward the distal end of the spring tube 223 during release of the stent 10. In the above embodiment, the pitch of the spring tube 223 is gradually increased along the proximal end of the spring tube 223 toward the distal end of the spring tube 223, so that the bending performance of the delivery tube 200 can be improved in the process of ensuring that the spring tube 223 provides the axial supporting force, so that the delivery tube 200 can better adapt to the path of the internal cavity, thereby being beneficial to improving the smoothness of the delivery tube 200 entering the cavity and reducing the damage to the inner wall of the internal cavity.

In alternative embodiments, spring tube 223 includes a plurality of sub-tube segments connected in series, with the sub-tube segment adjacent to head 222 having a greater pitch than the sub-tube segment distal from head 222. In this way, the bending performance of the delivery tube 200 can be improved in the process of ensuring the axial supporting force provided by the spring tube 223, so that the delivery tube 200 can be better adapted to the path of the internal cavity, thereby being beneficial to improving the smoothness of the delivery tube 200 entering the cavity and reducing the damage to the inner wall of the internal cavity.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of the present application is not limited to performing the functions in the order shown or discussed, but may also include performing the functions in a substantially simultaneous manner or in an opposite order depending on the functions involved, e.g., the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application.

Claims

1. A stent delivery device is characterized by comprising a shell (100), a delivery pipe (200), an operating wheel mechanism (300) and a locking piece (400),

the proximal end of the delivery tube (200) is connected with the housing (100), the operation wheel mechanism (300) is rotatably arranged on the housing (100), the operation wheel mechanism (300) is connected with the delivery tube (200), and the operation wheel mechanism (300) is configured to drive the stent in the delivery tube (200) to release from the distal end of the delivery tube (200);

the shell (100) comprises a first sub-part (110) and a second sub-part (120) connected with the first sub-part (110), the first sub-part (110) is configured into a hand holding structure, the locking piece (400) is movably arranged on the second sub-part (120), the locking piece (400) is in limit fit with the operation wheel mechanism (300) under the condition that the locking piece (400) moves to a first position relative to the shell (100), and the locking piece (400) limits the operation wheel mechanism (300) to rotate relative to the shell (100); -in case the locking member (400) is moved to a second position, the locking member (400) is separated from the operating wheel mechanism (300);

The locking piece (400) comprises a limiting part (410), an operating part (420) and a connecting part (430), wherein the limiting part (410) is arranged in the shell (100), the operating part (420) is arranged outside the shell (100), the shell (100) is provided with an avoidance groove (130), the connecting part (430) penetrates through the avoidance groove (130) and is connected with the operating part (420) and the limiting part (410), the connecting part (430) can slide along the avoidance groove (130),

the avoidance groove (130) is provided with a first damping section (131), at least part of the connecting part (430) is positioned on the first damping section (131) when the locking piece (400) moves to the first position relative to the shell (100), and the first damping section (131) interferes with the locking piece (400) to move to the second position;

the avoidance groove (130) has a second damping section (132), wherein at least part of the connecting part (430) is positioned at the second damping section (132) when the locking piece (400) moves to the second position relative to the shell (100), and the second damping section (132) interferes with the movement of the locking piece (400) to the first position.

2. The stent delivery device according to claim 1, wherein the operating wheel mechanism (300) includes a thumbwheel (310), the thumbwheel (310) is in running fit with the housing (100), and at least part of the thumbwheel (310) protrudes from an outer wall of the housing (100), and the locking member (400) is provided on a side of the housing (100) opposite to one end of the thumbwheel (310) in an axial direction.

3. The stent delivery device according to claim 2, wherein the second sub-section (120) is connected to one end of the first sub-section (110), and the locking member (400) is movable relative to the second sub-section (120) in a direction away from or toward the first sub-section (110); the operating wheel mechanism (300) further comprises a locking wheel (320), the locking wheel (320) and the thumbwheel (310) are coaxially arranged, the locking wheel (320) is connected with the thumbwheel (310), the peripheral wall of the locking wheel (320) is provided with a limiting groove (321),

at least part of the locking piece (400) is clamped in the limiting groove (321) on one side, adjacent to the first sub-part (110), of the locking wheel (320) under the condition that the locking piece (400) moves to a first position relative to the shell (100), or at least part of the locking piece (400) is clamped in the limiting groove (321) on one side, away from the first sub-part (110), of the locking wheel (320) under the condition that the locking piece (400) moves to the first position relative to the shell (100).

4. The stent delivery device of claim 1, wherein the first damping segment (131) has a progressively decreasing slot width in the direction of the first position toward the second position; and/or the avoidance groove (130) is provided with a second damping section (132), and the groove width of the second damping section (132) is gradually reduced along the direction from the first position to the second position.

5. The stent delivery device according to any one of claims 1 to 4, wherein the housing (100) has a first damping portion (140), the locking member (400) has a second damping portion (440),

the first damping portion (140) abuts against the second damping portion (440) when the locking member (400) moves to the first position relative to the housing (100), and the first damping portion (140) and the second damping portion (440) can increase resistance to movement of the locking member (400) from the first position to the second position, and/or the first damping portion (140) abuts against the second damping portion (440) when the locking member (400) moves to the second position relative to the housing (100), and the first damping portion (140) and the second damping portion (440) can increase resistance to movement of the locking member (400) from the second position to the first position.

6. A stent delivery device according to claim 2 or 3, further comprising a traction wheel (500), a guide wheel (600) and a traction rope (700), wherein the traction wheel (500) is arranged at intervals with the guide wheel (600), the traction wheel (500) is connected with the operation wheel mechanism (300), the operation wheel mechanism (300) can drive the traction wheel (500) to rotate, the guide wheel (600) is positioned at one side of the traction wheel (500) far away from the distal end of the shell (100), the guide wheel (600) is tangent with the delivery pipe (200), one end of the traction rope (700) is connected with the delivery pipe (200), the traction rope (700) bypasses the guide wheel (600) along the periphery of the guide wheel (600), and the other end of the traction rope (700) is connected with the traction wheel (500).

7. The stent delivery device of claim 6, wherein the traction wheel (500) is disposed coaxially with the thumbwheel (310), the traction wheel (500) and the guide wheel (600) are disposed on a first side of the delivery tube (200), at least a portion of the thumbwheel (310) radially protrudes from a second side of the delivery tube (200), and the first side of the delivery tube (200) and the second side of the delivery tube (200) are radially opposite sides of the delivery tube (200).

8. The stent delivery device of claim 7, wherein the delivery tube (200) comprises an outer tube (210), an ejector tube (220) and an inner tube (230), the ejector tube (220) is sleeved on the inner tube (230), the outer tube (210) is sleeved on the ejector tube (220), the distal end of the outer tube (210) and the distal end of the inner tube (230) protrude at least partially out of the ejector tube (220) and form a stent-receiving chamber,

the proximal end of the ejector tube (220) is provided with a guide tube section (221), the guide tube section (221) penetrates through the shell (100), and the proximal end of the guide tube section (221) is connected with the proximal end of the shell (100); the pull cord (700) is connected to the proximal end of the outer tube (210), and the pull cord (700) can pull the outer tube (210) to slide along the ejector tube (220).

9. The stent delivery device of claim 8, wherein the ejector tube (220) further comprises an ejector head (222) and a spring tube (223), a proximal end of the spring tube (223) being connected to the guide tube section (221), a distal end of the spring tube (223) being connected to a proximal end of the ejector head (222),

The outer diameter of the ejector head (222) is adapted to the inner diameter of the outer tube (210), the ejector head (222) is slidable along the lumen of the outer tube (210),

the outer diameter of the spring tube (223) is smaller than the outer diameter of the ejection head (222), and an avoidance gap is formed between the spring tube (223) and the inner wall of the outer tube (210).

10. The stent delivery device of claim 9, wherein the pitch of the spring tube (223) increases gradually along the proximal end of the spring tube (223) toward the distal end of the spring tube (223), or,

the spring tube (223) comprises a plurality of sub-tube sections which are connected in sequence, and the pitch of the sub-tube sections adjacent to the ejection head (222) is larger than that of the sub-tube sections far away from the ejection head (222) in two sub-tube sections.