CN108236533B

CN108236533B - Conveying system

Info

Publication number: CN108236533B
Application number: CN201611219962.1A
Authority: CN
Inventors: 张军强
Original assignee: Lifetech Scientific Shenzhen Co Ltd
Current assignee: Lifetech Scientific Shenzhen Co Ltd
Priority date: 2016-12-26
Filing date: 2016-12-26
Publication date: 2024-09-24
Anticipated expiration: 2036-12-26
Also published as: CN108236533A

Abstract

The invention discloses a conveying system of an implant, which comprises a sheath tube, a guide rod sleeved outside the sheath tube and a sliding handle connected with the proximal end of the sheath tube, wherein the guide rod is provided with a sliding groove extending along the axial direction of the guide rod and a tooth-shaped structure arranged on the outer peripheral surface of the guide rod. The sliding handle is connected with the proximal end of the sheath tube through a connecting piece arranged in the chute and can drive the sheath tube to axially slide in the guide rod. The locking device is connected with the sliding handle and comprises a guide rod sleeve, a tooth block and a locking piece. The guide rod sleeve is positioned in the sliding handle and coaxially sleeved outside the guide rod, and the tooth block is positioned in the sliding handle and is provided with a meshing part meshed with the tooth-shaped structure of the guide rod. The locking piece drives the engagement part to engage with or disengage from the tooth-shaped structure, thereby realizing the locking of the driving device or unlocking the driving device. The locking device can be matched with the bracket to carry out safe release, so that the bracket can be controlled step by step in the release process, and the defects of displacement and failure in bracket release caused by unstable operation in the bracket release process are avoided.

Description

Conveying system

Technical Field

The present invention relates to the field of cardiovascular medical devices, and more particularly to a delivery system for delivering vascular stents into the body.

Background

With the continuous development of interventional techniques, the advantages of using a stent graft for treating aortic aneurysms and aortic dissection diseases are highlighted. The stent graft is typically compressed into the space between the sheath and the sheath core tube of the stent delivery device prior to implantation in the human body. Before delivering the stent graft, the vessel is typically selectively punctured at the femoral or iliac artery site, a track is created with a guidewire, the stent graft is delivered to the lesion site with a delivery device, the sheath is pulled proximally until the stent graft is fully exposed to release the stent graft, and the delivery device is finally withdrawn from the body. As the covered stent has self-expansion property, once the restriction is lost due to the back-up of the sheath, the covered stent is released and opened to be clung to the wall of the aneurysm, thereby isolating blood flow from a lesion part, eliminating the impact of the blood flow on the lesion part and establishing a channel for normal blood circulation. The conveyor needs to ensure that the stent is released at a uniform speed and stably. The existing conveyor may have poor release position due to unstable operation during stent release, resulting in stent displacement or stent release failure.

In addition, when at least two stent-grafts are to be connected to each other to isolate a lesion, a first stent is implanted in a patient, and then a second stent is implanted, and the second stent is partially overlapped with the first stent. This means that when the second stent is implanted, if the second stent is not positioned accurately with respect to the release position of the first stent, the second stent is released, which easily results in that the two stents cannot be connected to each other or the overlapping portion is too short, which affects the therapeutic effect.

It is therefore desirable to provide a delivery system with a locking device to achieve gradual stent release or to achieve that after half stent release, the half released stent can be locked to hold the stent in the half released state, thereby avoiding too fast stent release or poor release position.

Disclosure of Invention

The invention aims to solve the technical problem of providing a conveying system with a release positioning locking function aiming at the defects of the prior art.

The technical scheme adopted for solving the technical problems is as follows: the utility model provides a construct a conveying system, includes sliding handle and handle, conveying system still include one end with the handle links to each other and the other end passes sliding handle's guide arm, locate in the guide arm and one end with sliding handle links to each other the other end and wears out the sheath pipe of handle, locate dead lever and sheath core pipe in the sheath pipe, the sheath core pipe with the distal end of dead lever links to each other, the guide arm has the spout that extends along its axial, the surface that the guide arm is located the spout both sides is equipped with a plurality of tooth structures that separate each other along the guide arm axial, conveying system still include with the locking device that sliding handle links to each other, locking device is used for control sliding handle follows the spout is relative the motion of handle, thereby control sheath pipe is relative the motion of sheath core pipe.

In an embodiment of the present invention, the locking device includes a guide rod sleeve disposed in the sliding handle and sleeved outside the guide rod, a tooth block connected to the guide rod sleeve, and a locking member connected to the tooth block; the tooth block is provided with an engagement part which is used for being engaged with the tooth-shaped structure of the guide rod, and the locking piece is used for controlling the engagement part to be engaged with or separated from the tooth-shaped structure so as to control the movement of the sliding handle along the sliding chute relative to the handle.

In an embodiment of the present invention, the guide rod sleeve is provided with a supporting portion, the tooth block is connected with the supporting portion, the tooth block includes a prying section located at one side of the supporting portion and a meshing section located at the other side of the supporting portion, the meshing section is located on the meshing section, the locking piece is connected with the prying section, and the tooth block can swing around the supporting portion under the driving of the locking piece.

In an embodiment of the present invention, a window for exposing the tooth-shaped structure is formed on the guide rod sleeve, and the engagement portion of the tooth block is engaged with the tooth-shaped structure through the window.

In one embodiment of the present invention, the support portion has an arc-shaped surface, and the dental block is provided with an arc-shaped groove that mates with the support portion.

In an embodiment of the invention, the support part is a hinge, and the dental block is hinged with the guide rod sleeve through the hinge.

In an embodiment of the present invention, at least one end of the guide rod sleeve is provided with a pair of limiting blocks, the pair of limiting blocks are disposed opposite to each other so as to form a limiting groove, and at least one of the end portions of the prying section and the engaging section is located in the limiting groove.

In an embodiment of the invention, the locking piece comprises a fixed column connected with the prying section and a button sleeved on the fixed column, and the button is exposed from the sliding handle.

In an embodiment of the invention, the locking device further comprises an elastic member.

In an embodiment of the invention, the elastic piece comprises a guide post arranged on the engagement section and a spring sleeved on the guide post, wherein one end of the spring is abutted with the inner wall of the sliding handle, and the other end of the spring is abutted with the engagement section.

In one embodiment of the invention, the resilient member includes a spring collar that restrains the engagement section and the guide rod together.

In an embodiment of the present invention, the engagement section is provided with a groove, and the elastic ring is disposed in the groove.

In an embodiment of the invention, the elastic member includes an elastic member sleeved on the fixing column and located inside the button, and the elastic member abuts against the button.

In an embodiment of the present invention, the guide rod sleeve is provided with an opening for accommodating the dental block, and the supporting part is located in the opening and connected with the guide rod sleeve.

In an embodiment of the present invention, the locking member includes a trigger sleeve sleeved on the outer circumference of the guide rod sleeve and axially slidable relative to the guide rod sleeve, and a trigger for driving the trigger sleeve to axially slide relative to the guide rod sleeve, and the trigger is exposed from the sliding handle.

In an embodiment of the invention, the locking device further comprises an elastic piece, wherein the elastic piece comprises a spring top sleeve fixed at the proximal end of the guide rod sleeve and a return spring sleeved on the guide rod sleeve, one end of the return spring is abutted with the trigger sleeve, and the other end of the return spring is abutted with the spring top sleeve.

In an embodiment of the present invention, a circle of limiting groove is provided at a proximal end of the guide rod sleeve, the spring top sleeve includes a main body and a supporting portion extending radially from the proximal end of the main body, a hook body is provided on the main body and hooked in the limiting groove, and the supporting portion is abutted with the other end of the return spring.

In one embodiment of the invention, the plurality of tooth structures are parallel to each other.

The conveying system is provided with the locking device, the locking device can be matched with the bracket to carry out safe release, the uniform speed and stability of the bracket in the release process are ensured, the bracket is controlled step by step in the release process, and the defects of displacement and failure of bracket release caused by unstable operation in the bracket release process are avoided.

Drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a cross-sectional view of a first embodiment of a delivery system for an implant according to the present invention;

FIG. 2 is an exploded view of a locking device in the delivery system of the implant shown in FIG. 1;

FIG. 3 is a top view of the guide bar bushing of the locking device shown in FIG. 2;

FIG. 4 is a cross-sectional view of the guide rod bushing A-A shown in FIG. 3;

FIG. 5 is a cross-sectional view of a dental block in a first embodiment of the delivery system of the implant of the present invention;

FIG. 6 is a schematic view of the delivery system of the implant of FIG. 1 in a released state;

FIG. 7 is a schematic view of the implant delivery system of FIG. 1 in a locked state;

FIG. 8 is a cross-sectional view of a second embodiment of a delivery system for an implant according to the present invention;

FIG. 9 is an exploded view of a locking device in the delivery system of the implant shown in FIG. 8;

FIG. 10 is a cross-sectional view of a dental block in the delivery system of the implant shown in FIG. 8;

FIG. 11 is a schematic view of the delivery system of the implant of FIG. 8 in a released state;

FIG. 12 is a schematic view of the implant delivery system of FIG. 8 in a locked state;

FIG. 13 is a schematic view of a third embodiment of a delivery system for an implant according to the present invention;

FIG. 14 is a cross-sectional view of the delivery system of the implant of FIG. 13;

FIG. 15 is an exploded view of a locking device in the delivery device of the implant shown in FIG. 13;

FIG. 16 is an enlarged view of portion A of FIG. 15;

FIG. 17 is a top view of the guide bar bushing of the locking device of FIG. 15;

FIG. 18 is a cross-sectional view of the guide bar bushing B-B of FIG. 17;

FIG. 19 is a cross-sectional view of a dental block in the delivery device of the implant shown in FIG. 13;

FIG. 20 is a schematic view of the delivery system of the implant of FIG. 13 in a released state;

fig. 21 is a schematic view of the implant delivery system of fig. 13 in a locked state.

Detailed Description

The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

In the field of interventional medicine, it is common to define a proximal end that is relatively close to the operator and a distal end that is relatively far from the operator.

First embodiment:

As shown in fig. 1, a delivery system includes a sheath tube 11, a fixed rod 12, a sheath tube 22, a guide rod 21, a sliding handle 23, a handle 13, and a locking device 30.

The fixing rod 12 passes through the handle 13. The proximal end of the sheath core tube 11 is connected with the distal end of the fixing rod 12, and the TIP head 4 is also fixed at the distal end of the sheath core tube 11. The outer diameter of the sheath core tube 11 is smaller than the outer diameter of the fixing rod 12. The sheath tube 22 is coaxially sleeved outside the sheath core tube 11 and the fixed rod 12. The sheath core tube 11, the fixing rod 12 and the TIP head 4 are used as channels for guide wires, and the guide wires pass through the sheath core tube 11 and the fixing rod 12, and then the sheath 22 can smoothly enter the blood vessel through the guiding of the guide wires. The sheath core tube 11 is connected to the distal end of the fixing rod 12, and the sheath core tube 11 is thinner than the fixing rod 12 so as to form a stepped portion at the distal end of the fixing rod 12. The handle 13 is a fixed part of the conveyor, and the handle 13 is of a cavity structure for a doctor to hold in the operation process

The guide rod 21 is a lumen structure with a distal end fixed inside the handle 13 and a proximal end penetrating from the sliding handle 23. As shown in fig. 2, the guide rod 21 is provided with a sliding groove 212 along the length direction thereof, and a plurality of tooth-shaped structures 211 which are spaced apart from each other and are arranged in parallel with each other are distributed on the outer circumferential surface, preferably, the length extending direction of the tooth-shaped structures 211 is perpendicular to the length extending direction of the sliding groove 212. The sliding handle 23 is connected to the proximal end of the sheath 22 by a connector 24 (shown in FIG. 1) disposed within the chute 212, and the distal end of the sheath 22 extends out of the handle 13. When the locking device 30 is pressed, the sliding handle 23 is pulled, the sheath tube 22 can be driven by the connecting piece 24 to move along the sliding groove relative to the handle 13, and after the locking device 30 is released, the sliding handle 23 is kept still on the guide rod 21, and the sheath tube 22 is kept in position relative to the fixed rod 12 and the sheath core tube 11. When the sheath tube 22 moves to the state that the distal end face is folded with the end face of the TIP head 4, the inner wall of the sheath tube 22 is matched with the sheath core tube 11 and the distal end face of the fixed rod 12 to form a cavity for accommodating the stent graft, and the stent graft is compressed in the cavity, wherein the step part formed by the distal end face of the fixed rod 12 and the sheath core tube 11 and the proximal end face of the TIP head 4 are used for abutting against the two ends of the stent graft 50. At this time, the grip 13 is in contact with the slide handle 23, and the length of the sheath tube 11 between the distal end face of the fixing rod 12 and the proximal end face of the tip head 4 is equal to the effective length of the stent graft. When the sheath tube 22 is retracted to be flush with the end face of the distal end of the fixed rod 12 under the control of the sliding handle 23, the covered stent 5 is released and opened due to the loss of the restraint of the sheath tube 22, and when the sheath tube 22 moves proximally to expose part of the covered stent, the covered stent is in a half-release state. Preferably, the maximum length of the sliding handle 23 that can move along the guide bar 21 relative to the handle 13 is equal to the effective length of the stent graft, whereby the physician can directly pull the sliding handle 23 to the non-movable position to release the stent graft during operation.

Referring to fig. 1 and 2, the locking device 30 includes a guide rod sleeve 31 sleeved outside the guide rod 21, a tooth block 32 connected to the guide rod sleeve 31, and a locking member 33 connected to the tooth block 32. Wherein the guide bar sleeve 31 and the tooth block 32 are located inside the sliding handle 23.

As shown in fig. 2 to 4, the guide bar cover 31 is a hollow tubular member having a window 312 for exposing the tooth-shaped structure 211 on the guide bar 21 and a support portion 311 provided near the edge of the window 312. The support portion 311 has an arcuate surface. In addition, a pair of limiting blocks 313 are respectively arranged at two ends of the guide rod sleeve 31, and any pair of limiting blocks 313 are arranged at intervals relatively, so that a limiting groove 314 is formed between the two limiting blocks.

As shown in fig. 2 and 5, the dental block 32 has an arc-shaped groove 322 that mates with the arc-shaped surface of the support portion 311, and an engagement portion 321 that engages with the tooth-shaped structure 211 on the guide bar 21. Thus, the tooth block 32 is divided into a prying section 323 on one side of the arcuate recess 322 and an engaging section 324 on the other side of the arcuate recess 322 with the arcuate recess 322 or the support portion 311 being defined. The ends of the prying section 323 and the engaging section 324 are both located within the limiting groove 314, thereby ensuring that the tooth block 32 is relatively fixed in the X and Y directions with respect to the guide bar sleeve 31. In view of this, there may be only one pair of stoppers on the guide bar cover 31, and the stoppers may be disposed at either end of the guide bar cover 31. The engagement section 324 is exposed from the window 312 of the guide rod sleeve 31, the engagement portion 321 is located on the engagement section 324, and the engagement portion 321 is clamped between two adjacent tooth-shaped structures 211 on the guide rod 21 through the window 312. The fixing post 331 of the locking member 33 is perpendicular to the surface of the prying section 323 and is connected to the prying section 323. By pressing the button 332, the prying section 323 can be driven to swing by taking the supporting part 311 as a fulcrum, so that the meshing part 321 is driven to be separated from the tooth-shaped structure 211 on the guide rod 21, the locking of the sliding handle 23 is released, once the button 332 is released, the prying section 323 returns to the initial position by taking the supporting part 311 as the center, and the meshing part 321 is clamped between the two adjacent tooth-shaped structures 211 again, so that the locking of the sliding handle 23 is realized. It will be appreciated that the support portion 311 serves to provide a fulcrum for the oscillation of the dental block 32, and therefore, the structure of the support portion 311 is not limited to that given in the present embodiment, as long as the dental block 32 can be oscillated about the support portion 311. For example, the support 311 may be a hinge to which the tooth block 32 is connected so as to be swingable around the hinge.

In the present embodiment, the locking member 33 includes a fixing post 331 disposed on the prying section 323 of the tooth block 32 and a button 332 sleeved on the fixing post 331. The button 332 is exposed from the sliding handle 23 for convenient operation by the doctor. In addition, the locking device 30 further comprises an elastic member. In this embodiment, the elastic member is a spring 34 that binds the engagement section 324 and the guide rod 21 together. For better fixing the elastic ring 34, the engagement section 324 of the tooth block 32 is further provided with a groove 325 for accommodating the elastic ring 34. The elastic ring 34 is a component with a rebound function, and generates a radial binding force on the tooth block 32, so that the engagement portion 321 of the tooth block 32 is pressed to the guide rod 21 through the window 312 of the guide rod sleeve 31 and keeps an engaged state with the tooth-shaped structure 211 on the surface of the guide rod 21.

As shown in fig. 6, when the button 332 is pressed, and when the force of pressing the button 332 is greater than the radial binding force of the elastic ring 34 on the tooth block 32, the engaging portion 321 of the tooth block 32 is subjected to the force against the radial binding of the elastic ring 34, and the radial binding of the elastic ring 34 on the engaging portion 321 is released, so that the tooth-shaped structure 211 of the engaging portion 321 and the guide rod sleeve 21 is changed from the engaged state to the separated state, at this time, the force for restricting the relative sliding of the sliding handle 23 and the guide rod 21 disappears, and the sliding handle 23 can be pulled proximally or distally while the button 332 is pressed, so that the sheath tube 22 can be driven to slide in the axial direction, and the length of the sheath tube 11 exposing the sheath tube 22 is changed, namely, the length of the covered stent loaded in the sheath tube 22 is changed, so that the release of the covered stent 5 can be completed by pulling back the sliding handle 23 proximally.

As shown in fig. 7, when the button 332 is released, the radial force exerted by the button 332 on the prying section 323 of the tooth block 32 is removed, and the engaging portion 321 of the tooth block 32 is re-pressed into and brought into engagement with the tooth structure 211 of the surface of the guide bar 21 under the elastic restoring force of the elastic ring 34. After engagement, the sliding handle 23 is restrained from sliding in the axial direction of the guide rod 21, and the sheath tube 22 cannot be driven to axially slide. At this time, the half-released stent is locked, and the stent graft 5 cannot be released by operating the slide handle 23.

When the stent graft is conveyed and released by using the conveying system provided by the embodiment, once the half release position of the stent graft is found to be poor, the button 332 can be released at any time in the process of pulling the sliding handle 23 to be separated from the handle 13 to release the stent graft, the stent graft is kept in the half release state, and after the stent graft position is readjusted, the complete release of the stent graft is completed, so that the poor release position of the stent graft is avoided; in addition, the half-released stent can be locked after the half-released stent to keep the half-released stent, so that the over-quick release or poor release position of the stent is avoided.

Second embodiment:

As shown in fig. 8, a delivery system includes a sheath tube, a fixed rod, a sheath tube, a guide rod, a sliding handle, a grip, and a locking device 60. The functions and structures of the sheath core tube, the fixing rod, the sheath tube, the guide rod, the sliding handle and the handle are the same as those of the previous embodiment, so that the description of the embodiment is omitted.

As shown in fig. 9, the locking device 60 is connected to the sliding handle 53, and the locking device 60 includes a guide bar sleeve 61, a tooth block 62, a locking piece 63, and an elastic piece.

The guide bar sleeve 61 is constructed in the same manner as in the previous embodiment, a hollow tubular member having a window for exposing the tooth form 511 on the guide bar 51 and a support portion disposed near the edge of the window. The support part has an arc-shaped surface. In addition, two ends of the guide rod sleeve 61 are respectively provided with a pair of limiting blocks, and any pair of limiting blocks are arranged at intervals relatively to form a limiting groove.

The construction of the dental block 62 is also the same as in the previous embodiment. As shown in fig. 10, the tooth block 62 is connected to a support portion on the guide bar sleeve 61, and has an arc-shaped recess 621 which is fitted to an arc-shaped surface of the support portion and an engagement portion 622 which is engaged with the tooth-shaped structure 511 on the guide bar 51. Thus, the tooth block 62 is bounded by the arcuate slot 621 or support portion and is divided into a prying section 623 on one side of the arcuate slot 621 and an engaging section 624 on the other side of the arcuate slot 621. The ends of the prying section 623 and the engaging section 624 are both located in the limit grooves of the guide bar sleeve 61, thereby ensuring that the tooth block 62 is relatively fixed in the X and Y directions with respect to the guide bar sleeve 61. In view of this, there may be only one pair of stoppers on the guide bar cover 61, and the stoppers may be disposed at either end of the guide bar cover 61. The engagement section 624 is exposed from the window of the guide rod 61, the engagement portion 622 is located on the engagement section 624, the locking piece 63 is connected with the prying section 623, and can swing with the supporting portion as a fulcrum under the driving of the locking piece 63, so that the engagement portion 622 is driven to engage with or disengage from the tooth-shaped structure 511 on the guide rod 61, and locking or unlocking of the driving device is achieved. It will be appreciated that the support portion serves to provide a fulcrum for the oscillation of the dental block 62 and therefore the structure of the support portion is not limited to that given in the present embodiment, as long as the dental block 62 can be oscillated about the support portion. For example, the support may be a hinge to which the tooth block 62 is connected so as to be pivotable about the hinge.

In the present embodiment, the locking member 63 includes a fixing post 631 disposed on the prying section 623 of the tooth block 62 and a button 632 sleeved on the fixing post 631. The button 632 is exposed from the sliding handle 63 for convenient operation by the doctor. In addition, the locking device 60 further includes an elastic member 64. Unlike the previous embodiment, in the present embodiment, the elastic member 64 includes a guide post 641 disposed on the engaging section 624 and a spring 642 sleeved on the guide post 641, one end of the spring 642 abuts against the inner wall of the sliding handle 63, and the other end abuts against the engaging section 624. Spring 642 has good compression resistance and resiliency. The spring 642 has a radial pressure to the engagement section 624 of the tooth block 62 in a normal state, so that the engagement portion 622 of the engagement section 624 is engaged with the tooth structure 511 of the guide rod 51 and maintains the engaged state under the radial pressure. In other possible embodiments, the elastic member may further include only a spring sleeved on the fixing post, where the spring is accommodated in an annular space formed by an inner wall surface of the button and an outer peripheral surface of the fixing post, and one end of the spring abuts against the button and the other end abuts against the prying section.

As shown in fig. 11, when the button 632 is pressed, and when the force of pressing the button 632 is greater than the radial pressure of the spring 642 on the tooth block 62, the engaging portion 622 of the tooth block 62 is subjected to the force against the radial constraint of the spring 642, and the radial constraint of the spring 642 on the engaging portion 622 of the tooth block 62 is released, so that the tooth structure 511 of the engaging portion 622 and the guide rod sleeve 51 is changed from the engaged state to the disengaged state, and when the two tooth structures are completely separated, the force for constraining the sliding of the sliding handle 53 and the guide rod 51 is eliminated, the sliding handle 53 can drive the sheath 52 to slide in the axial direction, and at this time, the whole conveying system is in the released or unlocked state. At this time, the slide handle may be operated to perform a release operation on the stent graft.

As shown in fig. 12, when the force pressing the button 632 is removed, the radial force of the button 632 on the prying section 623 of the tooth block 32 is removed, and the engaging portion 622 of the tooth block 62 is re-pressed into and engaged with the tooth structure 511 of the surface of the guide rod 51 by the elastic restoring force of the spring 642. After engagement, the sliding handle 53 is restrained from sliding along the axial direction of the guide rod 51, the conveying system is in a locking state, and the sliding handle 53 cannot drive the sheath 52 to axially slide. At this time, the stent graft cannot be released by operating the slide handle.

Third embodiment:

As shown in fig. 13 and 14, a delivery system includes a sheath core tube 71, a fixing rod 72, and a handle 73. The mutual positional relationship and the connection relationship of the sheath core tube 71, the fixing rod 72 and the handle 73, and the structure of the three are the same as those described in the first embodiment.

As shown in fig. 14, the delivery system further includes a sheath 82, a guide rod 81 and a sliding handle 83 coaxially sleeved outside the fixed rod 72 in this order from inside to outside. The structure and function of the sheath 82, the guide rod 81 and the sliding handle 83 are the same as those of the first embodiment. Referring to fig. 13 and 15, the locking device 90 is connected to the sliding handle 83, and includes a guide rod sleeve 91, a tooth block 92 and a locking member 93.

As shown in fig. 17 and 18, a guide bar sleeve 91 is coaxially provided outside the guide bar 81 and inside the slide handle 83. The guide bar sleeve 91 is a hollow tubular member having an opening 912 for receiving the dental block 92 and a support portion 911 positioned within the opening 912 and coupled to the guide bar sleeve 91. The support portion 911 has an arcuate surface. In addition, a pair of limiting blocks 913 are respectively disposed at one end of the guide rod sleeve 91, and the two limiting blocks 913 are disposed opposite to each other at intervals to form a limiting slot 914.

As shown in fig. 19, the tooth block 92 is connected to the supporting portion 911 on the guide bar sleeve 91, and has an arc-shaped groove 922 which mates with the arc-shaped surface of the supporting portion 911 and an engagement portion 921 which engages with the tooth-shaped structure 811 on the guide bar 81. Thus, the tooth block 92 is divided into a prying section 924 on one side of the arcuate groove 922 and a mating section 923 on the other side of the arcuate groove 922, bounded by the arcuate groove 922 or the support portion 911. The end of the engagement section 923 is located within the limit groove 914 to ensure that the tooth block 92 is relatively fixed in the X and Y directions relative to the guide bar sleeve 91.

Referring to fig. 15, in the present embodiment, the locking member 93 includes a trigger sleeve 931 which is fitted around the outer periphery of the guide rod sleeve 91 and is axially slidable with respect to the guide rod sleeve 91, and a trigger 932 for driving the trigger sleeve 931 to axially slide. The trigger 932 is exposed from the sliding handle 83 for convenient manipulation by the physician. In addition, the locking device 90 further includes an elastic member. In this embodiment, the resilient member includes a spring top sleeve 95 secured to the proximal end of the guide sleeve 91 and a return spring 94 disposed over the guide sleeve 91. The spring top 95 includes a main body 951 and an abutment 952 extending radially from an outer periphery of the main body 951. The proximal end of the guide rod sleeve 91 is provided with a circle of limit groove 915, as shown in fig. 16, the inner surface of the main body 951 is provided with a circle of hook 953 hooked in the limit groove 915, one end of the return spring 94 is abutted with the trigger sleeve 931, and the other end is abutted with the abutting portion 952.

As shown in fig. 20, when the trigger 932 is slid, the trigger 932 drives the trigger sleeve 931 to slide axially, the trigger sleeve 931 drives the engagement portion 921 of the tooth block 92 and the tooth structure 811 of the guide rod 81 to move as a rocker from the engaged state to the disengaged state, the resistance generated by the engagement of the tooth block 92 and the guide rod 81 due to the tooth structure disappears, and the restraining force for restraining the sliding of the sliding handle 83 and the guide rod 81 disappears. By the axial sliding of the sliding handle 83, the sheath 82 is driven to slide along the axial direction, the support release positioning locking function is unlocked, and the support can be released continuously.

As shown in fig. 21, when the sliding of the trigger 932 is stopped and the force acting on the trigger 932 is removed, the trigger 932 and the trigger sleeve 931 perform a reverse return movement by the elastic restoring force of the return spring 94, and the trigger sleeve 931 drives the tooth block 92 and the guide bar sleeve 91 to perform a toothed structure to move from a separated state to a rocker in an engaged state. When the two tooth-shaped structures are engaged with each other, the sliding trend of the sliding handle 83 in the axial direction along the guide rod 81 is restrained, the conveying system is in a locking state, the sheath 82 cannot slide axially, and the stent releasing process is stopped.

In summary, through the locking device on the sliding handle, the sliding handle can stop at any time in the stent release process, so that the gradual release of the stent is realized, the release position of the stent can be locked in the gradual release process, the stable and controllable stent release process is realized, and the defects of displacement and stent release failure caused by unstable operation are overcome.

The embodiments of the present invention are not limited thereto, and any modification and variation of the present invention, according to the technical knowledge and common means in the art, without departing from the basic idea of the present invention, is within the scope of the present invention.

Claims

1. The conveying system comprises a sliding handle, a guide rod, a sheath tube, a fixed rod and a sheath core tube, wherein one end of the guide rod is connected with the handle, the other end of the guide rod penetrates through the sliding handle, the sheath tube is arranged in the guide rod, one end of the guide rod is connected with the sliding handle, the other end of the guide rod penetrates out of the handle, the fixed rod is arranged in the sheath tube, the sheath core tube is connected with the distal end of the fixed rod, the conveying system is characterized in that the guide rod is provided with a sliding groove extending along the axial direction of the guide rod, a plurality of tooth-shaped structures which are axially separated from each other along the guide rod are arranged on the outer surfaces of the two sides of the guide rod, and the conveying system further comprises a locking device connected with the sliding handle, and the locking device is used for controlling the sliding handle to move along the sliding groove relative to the handle so as to control the sheath tube to move relative to the sheath core tube;

The locking device comprises a guide rod sleeve, a tooth block and a locking piece, wherein the guide rod sleeve is arranged in the sliding handle and sleeved outside the guide rod, the tooth block is connected with the guide rod sleeve, and the locking piece is connected with the tooth block; the tooth block is provided with an engagement part which is used for being engaged with the tooth-shaped structure of the guide rod, and the locking piece is used for controlling the engagement part to be engaged with or separated from the tooth-shaped structure so as to control the movement of the sliding handle along the sliding chute relative to the handle;

The guide rod sleeve is provided with a supporting part, the tooth block is connected with the supporting part, the tooth block comprises a prying section positioned at one side of the supporting part and a meshing section positioned at the other side of the supporting part, the meshing section is positioned on the meshing section, the locking piece is connected with the prying section, and the tooth block can swing around the supporting part under the drive of the locking piece;

The guide rod sleeve is provided with a window for exposing the tooth-shaped structure, the meshing part of the tooth block is meshed with the tooth-shaped structure through the window, the prying section is positioned outside the window, and when the locking piece is pressed, at least the distal end side of the prying section can be abutted to the outer surface of the guide rod sleeve.

2. The delivery system of claim 1, wherein the distal end of the fixation rod forms a stepped portion.

3. The delivery system of claim 1, wherein the support has an arcuate surface and the dental block is provided with an arcuate recess that mates with the support.

4. The delivery system of claim 1, wherein the support is a hinge, and the dental block is hinged to the guide bar housing by the hinge.

5. The conveyor system of claim 1, wherein at least one end of the guide sleeve has a pair of stop blocks disposed opposite each other to form a stop slot, and wherein at least one of the ends of the prying section and the engaging section is disposed within the stop slot.

6. The delivery system of any of claims 1-5, wherein the locking member comprises a fixed post connected to the prying section and a button disposed over the fixed post, the button being exposed from the sliding handle.

7. The delivery system of claim 6, wherein the locking device further comprises a resilient member.

8. The delivery system of claim 7, wherein the elastic member comprises a guide post provided on the engagement section and a spring sleeved on the guide post, and wherein one end of the spring abuts against the inner wall of the sliding handle and the engagement section.

9. The delivery system of claim 7, wherein the resilient member comprises a spring collar that restrains the engagement section and the guide rod together.

10. The delivery system of claim 9, wherein the engagement section has a recess therein, and wherein the spring ring is disposed within the recess.

11. The delivery system of claim 7, wherein the elastic member comprises an elastic member sleeved on the fixed post and positioned inside the button, the elastic member abutting the button.

12. The conveyor system of claim 1, wherein the plurality of tooth structures are parallel to one another.