Disclosure of Invention
The embodiment of the invention provides a stent conveying system, which aims to solve the problems that in the process of conveying a covered stent to a focus and placing the covered stent by a stent conveying system in the prior art, the releasing position accuracy of a quickly released conveying system is poor, the covered stent covers important branch blood vessels or internal leakage and stent displacement are easily caused, the risk that blood flow is blocked by the stent conveying system for a long time, the blood vessels or aneurysms are possibly ruptured, even hemorrhagic stroke and other serious life influence conditions are possibly caused due to overhigh cerebral arterial pressure, and the like.
In order to solve the technical problem, the embodiment of the invention discloses the following technical scheme:
the embodiment of the invention provides a stent conveying system, which comprises: the handle (16), the connecting device (23), the far-end outer tube (1), the safety lock (27) and the middle shaft (9) are sequentially connected, and the handle (16), the connecting device (23) and the far-end outer tube (1) are sequentially connected; wherein,
the middle shaft (9) is arranged in the far-end outer tube (1) and the connecting device (23) and penetrates through the handle (16), and the middle shaft (9) is used for fixedly supporting the covered stent;
the handle (16) comprises a fixed handle (17) and a rotating handle (18), the fixed handle (17) is sleeved at the front end of the rotating handle (18), the rotating handle (18) rotates relative to the fixed handle (17) and drives the connecting device (23) and the far-end outer tube (1) to move;
the safety lock (27) is connected with the fixed handle (17).
Optionally, a guide groove (19), a guide groove lock (21) and a sliding piece (20) are arranged in the fixed handle (17) and the rotating handle (18), wherein,
the sliding part (20) is sleeved in the guide groove (19), the outer side thread of the sliding part (20) is meshed with the inner side thread of the rotating handle (18), and the sliding part (20) moves axially along the guide groove (19);
the guide groove (19) is fixed in the handle (16) by the guide groove lock (21), and the guide groove lock (21) is used for fixing the guide groove (19).
Optionally, the sliding member (20) is flexibly connected or attached to one end of the connecting device (23), and the sliding member (20) moves axially along the guide groove (19) and drives the connecting device (23) and the distal outer tube (1) to move.
Optionally, the safety lock (27) comprises a strain relief sleeve (28) and a bolt (29), wherein,
the strain relief sleeve (28) is connected to the bolt (29);
the strain relief sleeve (28) is used for being clamped at the front end of the fixed handle (17), and the strain relief sleeve (28) is used for locking and preventing the connecting device (23) and the far-end outer tube (1) from axially moving relative to the fixed handle (17).
Optionally, the distal outer tube (1) comprises a marker ring (2), a tube body (3), a hemostatic valve seat (5), a side tube (6), a valve (7) and a connector (8), wherein,
a hollow tube cavity is arranged in the tube body (3), and the middle shaft (9) is placed in the tube cavity;
the index ring (2) is arranged at the front end of the tube body (3), the hemostasis valve seat (5) is arranged at the tail end of the tube body (3), and a hemostasis valve (4) is arranged in the hemostasis valve seat (5);
the hemostatic valve seat (5) is connected with the connecting piece (8), and the connecting piece (8) is connected with the connecting device (23);
the inner cavity of the hemostatic valve seat (5) is communicated with the valve (7) through the side pipe (6).
Optionally, two ends of the connecting device (23) are respectively connected with the connecting piece (8) of the distal outer tube (1) and a sliding piece (20) arranged in the handle (16); wherein,
the connecting device (23) is connected with a sliding piece (20) arranged in the handle (16) in a hanging or flexible way.
Optionally, the middle shaft (9) comprises a conical head (10), a thin-walled shaft (12), a support shaft (13) and a reinforcing shaft (14), and the conical head (10) is connected with the thin-walled shaft (12); wherein,
the guide wire cavity (15) penetrates through the thin-wall shaft (12), the supporting shaft (13) and the reinforcing shaft (14), a guide wire is placed in the guide wire cavity (15), and the guide wire penetrates through the middle shaft (9);
the thin-wall shaft (12) and the supporting shaft (13) are arranged in a tube cavity of the far-end outer tube (1), the conical head (10) extends out of the far-end outer tube (1), and the tail end of the conical head (10) is correspondingly arranged at the position of the mark ring (2) of the far-end outer tube (1).
Optionally, a cylindrical space is formed between the thin-walled shaft (12) of the middle shaft (9) and the inner wall of the lumen of the distal outer tube (1); wherein,
the cylindrical space is used for placing the covered stent, and the middle shaft (9) supports and fixes the covered stent.
Optionally, the conical head (10) is a flexible conical head.
Optionally, the middle shaft (9) further comprises a rear release device (11), wherein,
the rear release device (11) is arranged between the conical head (10) and the thin-walled shaft (12), and the rear release device (11) is provided with a control device at the tail end of the handle (16).
According to the technical scheme, the stent conveying system provided by the embodiment of the invention comprises a handle, a connecting device, a far-end outer tube and a middle shaft, wherein the handle, the connecting device and the far-end outer tube are sequentially connected, the middle shaft is arranged in the far-end outer tube, the connecting device and the handle, and the middle shaft is used for fixedly supporting the covered stent; the handle comprises a fixed handle and a rotating handle, the fixed handle is sleeved outside the rotating handle at the front end of the rotating handle, a guide groove and a sliding piece are arranged in the fixed handle and the rotating handle, the sliding piece is connected with the connecting device, the sliding piece is used for axially moving on the guide groove, and the connecting device and the far-end outer tube are driven to move backwards when the sliding piece moves backwards; according to the stent delivery system provided by the embodiment of the invention, in the process that the sliding piece is retreated on the guide groove through the handle, the outer tube at the far end is retreated in a blood vessel, so that the covered stent is released quickly.
Furthermore, in the process of conveying the covered stent by the stent conveying system, a doctor can preliminarily position the covered stent at a focus through a mark ring on the far-end outer tube and a mark (mark) position at the front end of the covered stent according to experience, then the rotating handle rotates to drive the far-end outer tube to move, so that the release speed of the covered stent is low, the release length of the stent can be accurately controlled, when 1-2 sections of covered stents are released, the rotation of the handle is suspended, at the moment, the mark (mark) indicating the start position of the covered stent at the front end is unfolded along with the covered stent, the position where the covered stent is placed can be more clearly indicated, the covered stent is not attached to the wall and does not block the aortic blood flow, and the adjustment of the position of the covered stent is not hindered; whether it is unanimous with the anticipated tectorial membrane initial position of setting for the support to place through observing the sign position, if it leans on before the sign, then slowly move whole conveying system to the target location backward, if it leans on the back then slowly forward pushes away whole conveying system to the target location to can realize tectorial membrane support's accurate positioning, after the support accurate positioning, pull the distal end outer tube backward, make tectorial membrane support quick release, avoid tectorial membrane support to block aorta blood flow for a long time, influence the operation effect or cause serious damage to the human body. Therefore, the covered stent is accurately released, the release speed of the covered stent is improved, the blocking time of the covered stent on the aortic blood flow is reduced as much as possible, the success of the operation is finally promoted, the postoperative effect is improved, and the covered stent can be quickly recovered, the displacement of the stent is reduced, the intervention of the operation is performed again and the like.
Further, in the stent delivery system provided by this embodiment, the safety lock is disposed at the handle, and when the safety lock is in a locked state, the connection device and the distal outer tube cannot axially move (i.e., cannot advance or retreat) relative to the handle, so as to avoid the conditions that the distal outer tube moves to release the stent graft, which causes product failure and the like, during transportation of the stent graft and during insertion of the stent delivery system into a blood vessel or preparation for surgery; and, this connecting device is affiliated to with the slider of handle and is connected or flexonics, makes the process that the distal end outer tube moved backward not rely on the removal or the position of slider to make after carrying out accurate location to the covered stent, the accessible moves the distal end outer tube backward and makes the covered stent release fast, reduces the jam to blood in the blood vessel among the covered stent release process, thereby improves the operation success rate, reduces the incidence of adverse event.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a schematic structural diagram of a stent delivery system according to an embodiment of the present invention is provided. Meanwhile, referring to fig. 2, a schematic structural diagram of another stent delivery system provided by the embodiment of the present invention, specifically, a partial structural diagram of the handle 16 of the stent delivery system, is shown.
As shown in fig. 1, the stent delivery system provided in the present embodiment includes: the handle 16, the connecting device 23, the far-end outer tube 1, the safety lock 27 and the middle shaft 9 are sequentially connected, the middle shaft 9 is arranged in the far-end outer tube 1 and the connecting device 23 and penetrates through the handle 16, and the middle shaft 9 is used for fixedly supporting the covered stent; the handle 16 comprises a fixed handle 17 and a rotating handle 18, the fixed handle 17 is sleeved outside the front end of the rotating handle 18, and the rotating handle 18 can rotate relative to the fixed handle 17 according to a specified direction, so that the connecting device 23 and the far-end outer tube 1 are driven to move; the safety lock 27 is connected to the stationary handle 17, thereby locking the connecting device 23 and the distal outer tube 1 and preventing the connecting device 23 and the distal outer tube 1 from moving axially relative to the stationary handle 17.
By adopting the stent delivery system provided by the embodiment, because the handle 16 is connected with the connecting device 23, and the connecting device 23 is connected with the distal end outer tube 1, the middle shaft 9 is arranged in the distal end outer tube 1, and the covered stent is placed between the middle shaft 9 and the distal end outer tube 1 and is fixedly supported by the middle shaft 9. The rotating handle 18 of the handle 16 is rotated to enable the rotating handle 18 and the sliding part 20 in the fixed handle 17 to be connected with the connecting device 23 in a hanging or flexible mode, and the sliding part 20 moves axially on the guide groove 19, so that the connecting device 23 connected with the handle 16 is driven to move axially, and the distal end outer tube 1 retreats in the blood vessel, and the covered stent is released.
Further, in the stent delivery system provided by this embodiment, the safety lock is disposed at the handle, and when the safety lock is in the locked state, the connection device and the distal outer tube cannot move axially (i.e., cannot advance or retreat) relative to the handle, so as to avoid situations such as product failure caused by the release of the stent graft due to the movement of the distal outer tube during transportation of the stent graft and during insertion of the stent delivery system into a blood vessel or preparation for surgery.
In the process of conveying the covered stent by the stent conveying system, a doctor can preliminarily position the covered stent at a focus through a mark ring on a far-end outer tube and a mark (mark) at the front end of the covered stent according to experience, then a rotary handle rotates to drive the far-end outer tube to move, so that the release speed of the covered stent is relatively low, the release length of the stent can be accurately controlled, when 1-2 sections of covered stents are released, the rotation of the handle is suspended, at the moment, the mark (mark) at the front end of the covered stent, which indicates the initial position of a covered stent, is unfolded along with the covered stent, the position where the covered stent is to be placed can be more clearly indicated, the covered stent is not attached to the wall and does not block aortic blood flow, and the adjustment of the position of the covered stent is not hindered; whether it is unanimous with the anticipated tectorial membrane initial position of setting for the support to place through observing the sign position, if it leans on before the sign, then slowly move whole conveying system to the target location backward, if it leans on the back then slowly forward pushes away whole conveying system to the target location to can realize tectorial membrane support's accurate positioning, after the support accurate positioning, pull the distal end outer tube backward, make tectorial membrane support quick release, avoid tectorial membrane support to block aorta blood flow for a long time, influence the operation effect or cause serious damage to the human body. Therefore, the covered stent is accurately released, the release speed of the covered stent is improved, the blocking time of the covered stent on the aortic blood flow is reduced as much as possible, the success of the operation is finally promoted, the postoperative effect is improved, and the covered stent can be quickly recovered, the displacement of the stent is reduced, the intervention of the operation is performed again and the like.
As shown in fig. 2, a guide groove 19 and a sliding member 20 are provided in the fixed handle 17 and the rotating handle 18, the sliding member 20 is connected to the connecting device 23, and the sliding member 20 is sleeved on the guide groove 19 and can move axially in the guide groove 19, so as to drive the connecting device 23 and the distal end outer tube 1 to move backwards; in order to ensure that the guide groove 19 arranged in the handle 16 is more stable, a guide groove lock 21 is arranged in the handle 16, the guide groove lock 21 is arranged at two ends of the handle 16 and used for clamping the guide groove 19, specifically, a groove arranged at the front end of the guide groove lock 21 is embedded with a protrusion arranged at the inner side of the front end of the fixed handle 17, so that the guide groove 19 cannot rotate along with the rotating handle 18; specifically, referring to fig. 2, two guide slots 19 are formed in the handle 16, the guide slots 19 penetrate through the fixed handle 17 and the rotating handle 18, and the guide slot locks 21 are fixed at two ends of the two guide slots 19; the sliding part 20 is sleeved on the two guide grooves 19, and the sliding part 20 can move along the guide grooves 19, so that the connecting device 23 connected with the sliding part and the far-end outer tube 1 are driven to move, and the covered stent is released quickly.
Referring to fig. 3, a schematic structural diagram of another stent delivery system provided in the embodiment of the present invention, specifically, a partial structural diagram of a safety lock 27 of the stent delivery system is provided.
It should be noted that in the stent delivery system provided in this embodiment, the rotating handle 18 is connected to the sliding member 20, for example, the inner side of the rotating handle 18 is connected to the sliding member 20 through a matching screw thread, the screw thread on the inner side of the rotating handle 18 is engaged with the screw thread on the sliding member 20, the groove provided on the front end of the guide groove lock 21 is embedded with the protrusion provided on the inner side of the front end of the fixed handle 17, the guide groove lock 21 is caught by the fixed handle 17, so that the guide groove 19 cannot rotate with the rotating handle 18, and during the rotation of the rotating handle 18 relative to the fixed handle 17, the sliding member 20 is axially moved in the handle 16 along the guide groove 19. However, the other connection or operation between the rotating handle 18 and the sliding member 20 is not limited to the embodiment of the present invention, and will not be further described herein.
As shown in the drawings, in the stent delivery system provided in this embodiment, before the stent graft delivered by the stent delivery system reaches the lesion, in order to ensure that the stent graft can be accurately released, the release position is not deviated, and the stent graft is not released in advance, the stent delivery system further includes a safety lock 27, specifically, the safety lock 27 is disposed at the front end of the handle 16, connected to the fixing handle 17, and the connecting device 23 is locked by the safety lock 27. The safety lock 27 comprises a strain release sleeve 28 and a bolt 29, the strain release sleeve 28 of the safety lock 27 is connected with the bolt 29, the strain release sleeve 28 is clamped in the fixed handle 17, and in the implementation process, when the safety lock 27 is in a locking state, namely the bolt 29 is in a tightening state, the strain release sleeve 28 is in extended clamping in the fixed handle 17, so that the connecting device 23 and the distal outer tube 1 cannot axially move (cannot advance or retreat) relative to the handle 16, and therefore the conditions that the stent graft is released in advance due to the movement of the distal outer tube 1 in the transportation process and the insertion process of a stent delivery system into a blood vessel or the preparation process of an operation, and the product is invalid and the like are avoided.
However, the structure of the safety lock 27 is not limited to the strain-adaptive sleeve 28 and the bolt 29 provided in this embodiment, and a V-shaped spring bolt or a fixing sleeve may be provided, so that the positions of the distal outer tube 1 and the handle 16 are relatively fixed when the safety lock 27 is in the locked state, thereby preventing the stent graft from being released prematurely during transportation, surgical preparation or insertion of the stent delivery system into the blood vessel.
Referring to fig. 4, a schematic structural diagram of another stent delivery system provided in the embodiment of the present invention, specifically, a schematic structural diagram of a distal outer tube 1 of the stent delivery system.
As shown in the figures, the distal outer tube 1 of the stent delivery system provided in this embodiment includes a marker ring 2, a tube body 3, a hemostatic valve seat 5, a valve 7, and a connector 8, where the tube body 3 is a hollow tube, and a hollow tube cavity is disposed in the tube body 3, and is used for placing a central shaft 9; the marker ring 2 is made of materials such as platinum, gold, platinum alloy, tungsten alloy or gold alloy, the marker ring 2 is arranged at the front end of the tube body 3 and used for developing under X rays, so that medical personnel can move the far-end outer tube 1 at the position of the stent delivery system displayed by the developing device from the outside to be used for the primary positioning of the stent graft by the stent delivery system; the hemostatic valve seat 5 is disposed at the end of the tube body 3, and the hemostatic valve seat 5 is connected to the connecting member 8, and the connecting member 8 is connected to the connecting device 23. Wherein, this hemostasis valve seat 5 embeds has hemostasis valve 4, prevents through this hemostasis valve 4 that blood from directly flowing out in the distal end outer tube 1 extracorporeally, and this hemostasis valve 4 that hemostasis valve seat 5 embeds has valve 7 through side pipe 6 intercommunication, and in the implementation, through this valve 7 be convenient for tectorial membrane support's exhaust, wash and pass through valve 7 and carry the medicine in the operation process.
It should be noted that a middle shaft 9 for supporting and fixing the covered stent is arranged in the tube body 3 of the distal outer tube 1, and the covered stent is fixed between the middle shaft 9 and the tube body 3 of the distal outer tube 1, so that the covered stent is kept in a compressed state through the distal outer tube 1, and the covered stent can be placed at a focus through minimally invasive intervention; moreover, the inner layer of the tube body 3 is made of high-density polyethylene, polytetrafluoroethylene or polyformaldehyde materials, the structure of the tube body 3 is reinforced by adopting a stainless steel wire mesh, a spring, a nylon mesh or a glass fiber mesh and the like, and the outer surface of the tube body 3 is treated by a hydrophilic coating, so that the blood vessel is protected from being damaged by the covered stent in the process that the covered stent enters the blood vessel by the far-end outer tube 1.
Referring to fig. 5, a schematic structural diagram of another stent delivery system according to an embodiment of the present invention, specifically, a partial structural diagram of the connection device 23 of the stent delivery system is provided.
As shown in the figures, two ends of the connecting device 23 are respectively connected to the distal outer tube 1 and the handle 16, wherein the connecting device 23 comprises a joint 24, a connecting tube 25 and a boss 26, and the joint 24 and the boss 26 are respectively arranged at two ends of the connecting tube 25; wherein, the connecting pipe 25 is connected with the connecting piece 8 arranged on the far-end outer pipe 1 through the joint 24, the connecting pipe 25 is connected with one end of the sliding piece 20 of the handle 16 through the boss 26, so that the connecting device 23 is respectively connected with the far-end outer pipe 1 and the handle 16, and then the rotating handle 18 rotates relative to the fixed handle 17 to drive the connecting device 23 and the far-end outer pipe 1 to move.
In the connecting device 23 provided in this embodiment, the boss 26 of the connecting device 23 is hung on one end of the sliding member 20 or flexibly connected with the sliding member 20, when the sliding member 20 moves backwards in the guiding groove 19, the sliding member 20 drives the whole connecting device 23 to move backwards, and the connecting device 23 enables the sliding member 20 to move backwards during the rotation of the handle 16 to drive the distal outer tube 1 to move backwards. The connection device 23 does not influence the direct backward movement of the far-end outer tube due to the hanging connection or the flexible connection between the boss 26 and the sliding piece 20, so that the far-end outer tube 1 is independently pulled to move backward after the precise positioning of the covered stent is realized, and the covered stent can be rapidly released at any time.
The connecting device 23 in the stent delivery system of the present invention is not limited to the embodiment that the joint 24 and the boss 26 are provided at two ends of the connecting tube 25, and other connecting means such as a retractable sleeve, a connecting rod, a rope connection, etc. can be provided to connect with the distal outer tube 1 and the sliding member 20 in the handle 16, respectively, so as to realize that the rotating handle 18 of the handle 16 retreats with the distal outer tube 1 during the rotation process, thereby achieving the purpose of precisely positioning the stent graft, and meanwhile, the connecting device 23 and the sliding member 20 are connected by hanging or flexible connection, so that the distal outer tube 1 is directly pulled to move backwards without depending on the movement or position of the sliding member 20.
Referring to fig. 6, a schematic structural diagram of another stent delivery system provided in the embodiment of the present invention, specifically, a schematic structural diagram of a central shaft 9 of the stent delivery system.
As shown, the middle shaft 9 comprises a conical head 10, a thin-walled shaft 12, a supporting shaft 13 and a reinforcing shaft 14, wherein the conical head 10 is connected with the thin-walled shaft 12; the guide wire cavity 15 penetrates through the thin-wall shaft 12, the supporting shaft 13 and the reinforcing shaft 14, a guide wire is arranged in the guide wire cavity 15 and penetrates through the central shaft 9, so that the stent conveying system enters a blood vessel along the guide wire under the guidance of the guide wire through the guide wire cavity 15 and pushes the coated stent to a target position (namely a focus).
In the implementation process, the middle shaft 9 is arranged in the lumens of the distal end outer tube 1 and the connecting device 23 and penetrates through the handle 16, the thin-walled shaft 12 of the middle shaft 9 supports and fixes the covered stent, in the implementation process, the thin-walled shaft 12 and the supporting shaft 13 of the middle shaft 9 are both arranged in the lumen of the distal end outer tube 1, the conical head 10 extends out of the distal end outer tube 1, the tail end of the conical head 10 is correspondingly arranged at the position of the indicating ring 2 of the distal end outer tube 1, and the moving position of the conical head 10 is determined by the development result of the indicating ring 2; because the diameter of the thin-wall shaft 12 is smaller than the diameters of the supporting shaft 13 and the reinforcing shaft 14, after the thin-wall shaft 12 is arranged in the lumen of the far-end outer tube 1, a cylindrical space is formed between the thin-wall shaft 12 and the tube wall of the far-end outer tube 1, so that the compressed stent graft is sleeved on the thin-wall shaft 12 and arranged in the cylindrical space.
It should be noted that, in the stent delivery system provided in this embodiment, the tapered head 10 of the central shaft 9 is the tapered head 10 made of elastic plastic containing barium sulfate or bismuth trioxide, so that the flexible tapered head 10 is used as the flexible tapered head end of the stent delivery system entering the blood vessel, which is convenient for delivering and tracking the guide wire through the tortuous blood vessel anatomical structure and has a position guidance effect by developing under X-ray; the conical head 10 is matched with the front end of the far-end outer tube 1, and the conical head 10 plays a role in guiding and transition in the stent delivery system, so that the injury to blood vessels in the processes of puncture, intravascular delivery and withdrawal of the stent delivery system from the blood vessels is avoided as much as possible; the supporting shaft 13 is a single-cavity tube or a double-cavity tube made of flexible materials, and the supporting shaft 13 is used for reinforcing a wire guide cavity 15 of the thin-wall shaft 12 and improving the bending resistance of the stent conveying system; the reinforcing shaft 14 serves to reinforce the supporting strength of the supporting shaft 13. Moreover, the guide wire cavity 15 for arranging the guide wire can be arranged as a nickel titanium tube, a polyether ether ketone tube, a spring reinforced tube, a polyphenylene ether tube or a polyterephthalic acid tube, so that the guide wire cavity 15 penetrates through the whole central shaft 9, and the stent conveying system is convenient to enter a focus part along the guide wire guide and obtain enough support when the covered stent is released.
Moreover, in the stent delivery system provided in this embodiment, the guide wire for delivering drugs and performing the operation is sequentially passed through the guide wire lumen 15 provided in the reinforcing shaft 14, the supporting shaft 13 and the thin-walled shaft 12 and is extended through the tapered end 10 of the central shaft 9, thereby performing drug delivery, resection and the like on the lesion. The conical head 10 in the central shaft 9 provides smooth transition of the stent graft carried by the stent delivery system into the blood vessel, reduces damage to the blood vessel in the process of delivering the stent delivery system to a lesion, and guides the stent graft to be released at the lesion.
Referring to fig. 7, a partial structural schematic view of a central shaft 9 of the stent delivery system according to the embodiment of the present invention is provided, and referring to fig. 8, a structural schematic view of a rear release device 11 of the stent delivery system according to the embodiment of the present invention is provided.
As shown in the figure, when the middle shaft 9 supports the fixed covered stent and needs to be released afterwards, the middle shaft 9 is provided with a back release device 11, the back release device 11 is arranged between the conical head 10 and the thin-wall shaft 12, the back release device 11 is provided with a control device at the tail end of the handle 16, and the control device controls and pulls the back release device 11 to act, so that the covered stent is released afterwards, and the back release function is provided for the covered stent.
In the stent delivery system provided in this embodiment, the rear release device 11 includes a receiver 30, a guide 31, a fixing ring 32, a stopper 33, a fixing pin 34, a release pull wire 35, a pull wire sleeve 36 and a pull wire fixing device 22, the conical head 10 is connected to the receiver 30, holes for the fixing pin 34 to pass through are provided on the receiver 30 and the guide 31, the guide 31 and the stopper 33 are provided on the thin-walled shaft 12, the fixing ring 32 is provided between the guide 31 and the stopper 33, the fixing pin 34 is fixed on the fixing ring 32 and is inserted into the holes provided on the receiver 30 and the guide 31, cavities which are mutually communicated are respectively provided in the support shaft 13 and the reinforcement shaft 14 of the center shaft 9, and the pull wire sleeve 36 is provided in the cavity; the release wire 35 has one end connected to the fixing ring 32 and the other end passing through the wire sleeve 36 of the middle shaft 9 and connected to the wire fixing device 22 provided outside, and the wire fixing device 22 is connected to the handle 16.
When the stent graft which needs to be released later is loaded, the fixing pin 34 is inserted into the receiver 30, the top end of the stent graft is fixed between the receiver 30 and the guider 31, after the stent graft is released for the first time, the front end of the fixing pin 34 is retracted into the guider 31 through the releasing pull wire 35 connected with the pull wire fixing device 22 by pulling the releasing pull wire 35, the top end of the stent graft is released, and therefore the stent graft is released later.
It should be noted that the rear release device 11 may determine whether to be disposed in the central shaft 9 according to the structure of the stent graft, if the stent graft does not need to be released afterwards, the rear release device 11 does not need to be disposed in the central shaft 9, otherwise, the rear release device 11 is disposed to provide the rear release function of the stent graft; of course, the structure of the rear release device 11 is not limited to the present embodiment.
In the stent delivery system provided in this embodiment, the implementation process of the stent delivery system is as follows:
firstly, according to the above embodiment, the middle shaft 9 is arranged in the distal outer tube 1, and the covered stent is placed in the hollow space between the thin-walled shaft 12 of the middle shaft 9 and the inner wall of the hollow lumen of the distal outer tube 1; the connecting piece 8 of the distal outer tube 1 is connected with the joint 24 of the connecting device 23, the boss 26 of the connecting device 23 is hung on or flexibly connected with the sliding piece 20 of the handle 16, and before the distal outer tube is inserted into a blood vessel, the connecting device 23 is locked relative to the handle 16 by tightening the bolt 29 on the safety lock 27 to ensure that the strain relief sleeve 28 is clamped in the handle 16, so that the connecting device 23 and the distal outer tube 1 are prevented from axially moving relative to the handle 16;
secondly, inserting the distal outer tube 1 and the middle shaft 9 into a blood vessel, displaying the position of the distal outer tube 1 entering the blood vessel through the indicating ring 2, loosening the bolt 29 of the safety lock 27 when reaching a focus, rotating the rotating handle 18 relative to the fixed handle 17 in a set direction, so that the sliding piece 20 moves backwards in the guide groove 19 along the axial direction of the guide groove 19, and driving the connecting device 23 and the distal outer tube 1 to slowly retreat in the blood vessel by the sliding piece 20, thereby releasing the covered stent;
then, the rotating handle 18 is rotated to drive the distal end outer tube 1 to move, so that the releasing speed of the covered stent is relatively low, the releasing length of the covered stent can be accurately controlled, when 1 to 2 sections of covered stents are released, the rotation of the handle 16 is suspended, at the moment, the indication mark (mark) of the front end of the covered stent for indicating the initial position of the covered stent is unfolded along with the covered stent, the position where the covered stent is to be placed can be more clearly indicated, and the covered stent is not attached to the wall and does not block the aortic blood flow, so that the adjustment of the position of the covered stent is not hindered; whether it is unanimous with the anticipated tectorial membrane initial position that places of settlement tectorial membrane support through observing the sign position, if it leans on before the sign, then slowly move whole conveying system to the target location backward, if it leans on the back then slowly forward pushes away whole conveying system to the target location, thereby can realize tectorial membrane support's accurate positioning, after the support accurate positioning, pull back distal end outer tube 1, make tectorial membrane support quick release, avoid tectorial membrane support to block aortic blood flow for a long time, influence the operation effect or cause serious damage to the human body.
The stent delivery system provided by the embodiment comprises a distal outer tube 1, a middle shaft 9 arranged in the distal outer tube 1, a handle 16 for enabling the covered stent to be accurately positioned at a lesion, and a connecting device 23 for connecting the distal outer tube 1 and the handle 16; the tectorial membrane stent is fixedly supported by the middle shaft 9, the flexible conical head 10 of the middle shaft 9 guides the middle shaft 9 and the far-end outer tube 1 to pass through a blood vessel and convey the tectorial membrane stent to a focus, the far-end outer tube 1 can retreat at the focus by rotating the rotating handle 18, and the position of the stent conveying system is adjusted according to the marking position of the tectorial membrane stent under X-ray development, so that the stent conveying system accurately positions the tectorial membrane stent. After the covered stent is accurately positioned, the far-end outer tube 1 is pulled backwards, so that the covered stent is released quickly, and the situation that the covered stent blocks aortic blood flow for a long time to influence the operation effect or cause serious damage to a human body is avoided.
Further, the stent conveying system provided by the embodiment has a simple structure, and compared with the conveying system in the prior art, the production cost is effectively reduced. Moreover, a covered stent is arranged between the tube body 3 of the far-end outer tube 1 of the stent delivery system and the thin-wall shaft 12 of the middle shaft 9, so that the size of the tube body 3 is reduced, and the operation difficulty in the process of the stent delivery system is effectively reduced. The connecting device 23 is locked by the safety lock 27, the relative sliding between the distal end outer tube 1 and the connecting device 23 in the process of inserting into a blood vessel, preparation for operation and transportation is avoided, so that the covered stent is released in advance, and the connection device 23 is connected with the sliding piece 20 in a hanging or flexible manner, so that the covered stent can be released quickly after being accurately positioned, and the release speed of the covered stent is effectively improved. Thereby effectively reducing the time for blocking the blood vessel, reducing the trauma to the blood vessel and avoiding the injury to the human body caused by the blockage of the blood vessel.
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 an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.