CN112842644B - Stent delivery device and stent system - Google Patents

Abstract

The invention provides a stent conveying device and a stent system. The stent delivery device is for delivering a stent of a stent system. The bracket conveying device comprises a conveying assembly, a pre-buried guide wire and a locking assembly, wherein a conveying channel is arranged in the conveying assembly, and the pre-buried guide wire penetrates through the conveying channel; the locking assembly comprises a slideway piece, a fixing piece and an operating piece which are sequentially arranged from inside to outside; the slideway piece is communicated with the conveying channel, and the periphery of the slideway piece is provided with a thread passing part for the pre-buried guide wire to pass through; the fixing piece is provided with an elastically overhanging compression arm which is opposite to the wire passing part; the operating piece is movably sleeved on the fixing piece and can move between a locking position and an unlocking position, a pressing part is arranged in the operating piece in a protruding mode, and the pressing part presses or releases the pressing arm, so that the pressing arm presses or releases the embedded guide wire. The invention conveniently guides the branch guide wire to enter the branch vessel through the window on the bracket through the pre-buried guide wire, and the locking component controls the locking or releasing of the pre-buried guide wire, so that the structure is compact.

Description

Stent delivery device and stent system

Technical Field

The invention relates to the field of medical equipment, in particular to a stent conveying device and a stent system, wherein the stent system comprises a stent and the stent conveying device.

Background

Abdominal Aortic Aneurysm (AAA) is a common aortic disease, and epidemiological studies have shown that AAA has a 5% incidence in men, but increases to 10% in patients aged 80 and older, and that the risk of tumor rupture is higher than in other people. By 2020, the population of our country over 80 years old would be predicted to reach 3000 tens of thousands, and over 90 years old would be over 1200 tens of thousands, with more and more advanced AAA patients in the future requiring treatment.

The existing main modes for treating the abdominal aortic aneurysm comprise a traditional open operation and an abdominal aortic aneurysm intracavity repair operation, and the two modes have advantages. Since the first example of the report of the abdominal aortic endoluminal prosthesis (EVAR) was used for treating abdominal aortic aneurysms in the 90 th century, the abdominal aortic endoluminal prosthesis has been rapidly developed in the short 20 th year due to the advantages of small trauma, short operation and hospitalization time, rapid postoperative recovery, low incidence of perioperative mortality and complications, and the like.

The abdominal aortic aneurysm endovascular prosthesis has the greatest advantages of no need of thoracotomy and abdominal opening, no need of clamping to block blood vessels, no internal organ ischemia in the operation and less complications. However, the biggest limitation is that the visceral aorta is not covered, especially the superior mesenteric and renal arteries, and the luminal repair of abdominal aortic aneurysms involving the renal arteries remains a difficulty.

At present, a stent type blood vessel is implanted into a patient by adopting a window stent type blood vessel, namely, a main body stent is implanted into an abdominal aorta, a window structure is arranged on the main body stent, and a branch stent is arranged on the window structure to lead to the branch blood vessel. The stent-type blood vessel implanted for carrying out the endoluminal treatment on the abdominal aortic aneurysm relates to the reconstruction of four branch arterial blood vessels of the celiac trunk artery, superior mesenteric artery and left and right renal arteries.

In the prior art, after the main body stent is implanted into an arterial vessel, the main body stent is repeatedly implanted into the branch stent, before the branch stent is implanted, the branch guide wire is guided into the branch vessel through the windowing structure of the main body stent, and then the branch stent is guided into the branch vessel through the windowing structure of the main body stent by the branch guide wire, however, the guiding of the branch guide wire to the branch vessel is very difficult, because the branch guide wire needs to pass through the windowing structure of the main body stent to reach the branch vessel, the distal end of the branch guide wire is very difficult to align and pass through the windowing structure of the main body stent, and how to effectively reduce the difficulty of the branch guide wire reaching the branch vessel through the windowing structure is the problem that current medical staff and medical research staff must jointly solve.

Disclosure of Invention

The invention aims to provide a stent conveying device and a stent system, which reduce the difficulty of a branch guide wire reaching a branch vessel through a windowing structure of a main body stent.

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

according to one aspect of the invention, the invention provides a stent delivery device, comprising a delivery assembly, a pre-buried guide wire and a locking assembly; a conveying channel which axially penetrates through the far end and the near end is arranged in the conveying component; the embedded guide wire penetrates through the conveying channel, and the proximal end of the embedded guide wire penetrates out of the proximal end of the conveying channel; the locking component comprises a slideway component, a fixing component and an operating component; the slideway piece is connected to the proximal end of the conveying assembly and communicated with the conveying channel, and a wire passing part for the embedded guide wire to pass out of the slideway piece is arranged on the periphery of the slideway piece; the fixing piece is fixedly sleeved on the slideway piece, and is provided with an elastically overhanging compression arm which is radially opposite to the wire passing part; the operating piece is movably sleeved on the fixing piece and can move between a locking position and an unlocking position, and a pressing part is arranged in the operating piece in a protruding mode; when the operating piece is positioned at the locking position, the pressing part is propped against the pressing arm, so that the pressing arm presses the embedded guide wire at the wire passing part; when the operating member is positioned at the unlocking position, the pressing part is staggered with the pressing arm, and the pressing of the pressing arm is released.

In some embodiments, the operating member is rotatably sleeved on the fixed member to move between a locked position and an unlocked position.

In some embodiments, one of the fixing piece and the operating piece is provided with a limit groove extending along the circumferential direction, and the other is convexly provided with a limit piece; the limiting piece is adaptively accommodated in the limiting groove and moves along the limiting groove, so that the operating piece rotates between a locking position and an unlocking position.

In some embodiments, a locking block is convexly arranged in the limiting groove corresponding to the locking position, a matched locking groove is arranged on the limiting piece corresponding to the locking block, and the limiting piece has elasticity.

In some embodiments, the pre-buried guide wire has a plurality of wires; the slide way piece is provided with a plurality of wire passing parts at intervals along the circumferential direction, the fixing piece is provided with a plurality of pressing arms at intervals along the circumferential direction, and the operating piece is provided with a plurality of pressing parts at intervals along the circumferential direction; at least one embedded guide wire penetrates through each wire passing portion, and the pressing portions, the pressing arms and the wire passing portions are arranged in one-to-one correspondence.

In some embodiments, the plurality of pressing portions have first and second pressing portions having different circumferential extension lengths; the unlocking positions are multiple, and the first pressing part and the second pressing part release the pressing of the corresponding pressing arms at different unlocking positions.

In some embodiments, the first pressing portion and the second pressing portion have a spacing in an axial direction.

In some embodiments, at least two of the pressing portions release the pressing of the corresponding pressing arm at the same unlocking position.

In some embodiments, the hold-down arm is cantilevered toward a proximal end that is a free end opposite the press portion.

In some embodiments, the outer surface of the free end is provided with an external pressing block.

In some embodiments, the wire passing portion includes a wire passing hole passing radially therethrough and a wire passing groove recessed inward from an outer circumference of the slideway member; the wire passing groove is positioned at the proximal end of the wire passing hole and is communicated with the wire passing hole; the pressing arm is at least opposite to the wire passing groove and can press the embedded guide wire to the wire passing groove.

In some embodiments, the wire passing groove extends circumferentially to form a pressing groove; the pressing arm protrudes inwards to form an inner pressing block, and the pressing block is opposite to the pressing groove and is adaptive in shape.

In some embodiments, the depth of the wire chase tapers in a proximal direction.

In some embodiments, the fastener includes a body and a tail at a proximal end of the body, the tail having a peripheral dimension that is less than a peripheral dimension of the body; the tail part is provided with a slot penetrating through the proximal end, and the pressing arm is positioned in the slot; the operating piece is sleeved at the tail part.

In some embodiments, the fixing element is provided with first indication marks corresponding to the locking position and the unlocking position at intervals, the operating element is provided with second indication marks, and the second indication marks are opposite to the corresponding first indication marks when the operating element is located at the locking position and the unlocking position.

In some embodiments, the stent delivery device further comprises a semi-release guidewire and a release slider; the semi-release guide wire penetrates through the conveying channel, and the proximal end of the semi-release guide wire penetrates out of the proximal end of the conveying channel and is fixedly connected with the release sliding block; the release slider is connected to the proximal end of the locking assembly and is capable of moving axially relative to the locking assembly to drive the semi-release wire to move proximally.

In some embodiments, the slideway element extends proximally beyond the fixed element, and an axially extending slideway is provided on the slideway element; the release slider is sleeved on the slideway piece, a limit protruding part is protruding from the release slider, and the limit protruding part is accommodated in the chute.

In some embodiments, a stop is protruding within the chute near the distal end, the stop being capable of stopping proximal movement of the limit tab.

In some embodiments, the chute is divided by the blocking portion into a first section near the distal end and a second section near the proximal end, the first section having a groove depth that is less than the groove depth of the second section.

According to another aspect of the present invention, there is also provided a stent system comprising a stent and a stent delivery device as described above, the outer circumference of the stent being provided with a window through which the distal end of the pre-buried guide wire enters the interior of the stent.

According to the technical scheme, the invention has at least the following advantages and positive effects: in the stent conveying device, the conveying channel which is axially communicated with the conveying component can be communicated with the stent, and the pre-buried guide wire which is arranged on the conveying channel in a penetrating way can enter the inner side of the stent through the window arranged on the stent, so that the branch guide wire can be guided to reach the branch vessel through the window on the stent, and the difficulty of the branch guide wire to reach the branch vessel is reduced. The embedded guide wire is locked or released through the locking component. The locking assembly is characterized in that the pressing part is arranged on the operating part, and the relative position of the pressing part and the pressing arm is changed by utilizing the movement of the operating part relative to the fixing part, so that the movement of the pressing arm is controlled, and the embedded guide wire can be pressed on the wiring part of the slideway part or released. The locking component has simple structure, compact structure and convenient operation. Further, the pressing part, the pressing arm and the wiring part are matched to control the pressing and releasing of the embedded guide wires, the expansion of the quantity of the embedded guide wires is facilitated, namely, when the embedded guide wires are multiple, the quantity of the pressing part, the pressing arm and the wiring part can be adaptively increased, the main structures of the operating piece, the fixing piece and the slideway piece do not need to be changed, the occupied space is small in structure, the whole structure is compact, and the operation is more convenient.

Drawings

Fig. 1 is a schematic view of the structure of a stent in a stent system according to an embodiment of the present invention.

Fig. 2 is a rear view of fig. 1, with a portion of the distal structure omitted from fig. 2.

Fig. 3 is a schematic structural view of a stent delivery device in a stent system according to an embodiment of the present invention.

Fig. 4 is a partial enlarged view at a in fig. 3.

Fig. 5 is a B-B view of fig. 4.

Fig. 6 is a view of fig. 5C-C.

Fig. 7 is an exploded perspective view of fig. 3 at a, with portions of the structural members omitted.

Fig. 8 is an enlarged view of the upper run in fig. 7.

Fig. 9 and 10 are schematic views of the glidepath of fig. 7 from two different perspectives.

Fig. 11 and 12 are schematic views of the upper fixture of fig. 7 from two different perspectives.

Fig. 13-14 are schematic views of the operating member of fig. 7 from two different perspectives.

Fig. 15 is a schematic view of the upper operating member of fig. 13 from another perspective.

Fig. 16 is a schematic view of the internal structure of the release slider of fig. 7.

The reference numerals are explained as follows:

100. a bracket; 101. coating a film; 1011. a first window; 1012. a second window; 1013. a third window; 1014. a fourth window; 102. a support frame; 103. a connecting piece;

200. a stent delivery device;

2. a sheath assembly;

3. a transport assembly; 31. a control handle; 32. a conveying channel; 33. a push rod; 34. a push rod support;

4. Pre-burying a guide wire; 41. a first guidewire; 42. a second guidewire; 43. a third guidewire; 44. a fourth guidewire;

5. a locking assembly;

51. a slideway member; 5101. a slide way is arranged; 5102. a glidepath; 511. a wire passing portion; 5111. a wire through hole; 5112. wire passing grooves; 5113. a pressing groove; 512. a wiring hole; 513. a chute; 5131. a first section; 5132. a second section; 514. a blocking portion; 515. fitting the protruding blocks;

52. a fixing member; 5201. an upper fixing part; 5202. a lower fixing part; 521. a main body; 5211. a clamping groove; 5212. a first indicator; 522. tail part; 5221. slotting; 5222. a hold-down arm; 5223. pressing the block inwards; 5224. pressing the block outwards; 5225. a convex ring; 5226. a clamping groove; 5227. a limit groove; 5228. a locking block;

53. an operating member; 5301. an upper operation part; 5302. a lower operation part; 531. a flange; 532. a limiting piece; 533. a locking groove; 534. a pressing part; 5341. a first pressing portion; 5342. a second pressing portion;

6. releasing the slide block; 61. a limit protrusion; 62. and a wiring groove.

Detailed Description

Exemplary embodiments that embody features and advantages of the present invention will be described in detail in the following description. It will be understood that the invention is capable of various modifications in various embodiments, all without departing from the scope of the invention, and that the description and illustrations herein are intended to be by way of illustration only and not to be construed as limiting the invention.

The invention provides a stent conveying device and a stent system with the stent conveying device. The stent system further comprises a stent that is implanted into a human blood vessel through the stent delivery device. The bracket conveying device is used for an operator to operate.

For ease of description, the term "proximal" is defined herein as the end of the stent delivery device that is proximal to the operator and the end that is relatively distal to the operator during operation; for vascular implants (such as stents), the end closer to the heart is the proximal end and the end farther from the heart is the distal end, along the direction of blood flow. In addition, the stent delivery device and the stent are both substantially tubular or cylindrical in structure, and the axial direction of the tubular or cylindrical shape is defined as the axial direction, the direction perpendicular to the axial direction is the radial direction, and the direction surrounding the axial direction is the circumferential direction.

As shown in fig. 1, the stent 100 has a radially contractible and expandable tubular structure, and generally includes a tubular cover 101 and a support frame 102 for supporting the cover 101. The outer circumference of the stent 100 has a window (i.e., a fenestration structure) which is opened on the covering film 101 and communicates with the inside and the outside of the stent 100, and the window is used for combining with other branched stents (not shown). The stent 100 is used to reconstruct the aorta of a human blood vessel, while the branch stent is used to reconstruct the branch vessel from the aorta. Depending on the number of branch vessels to be reconstructed, different numbers of windows may be provided on the stent 100.

Illustratively, in the stent 100 shown in FIG. 1, the stent 100 has four windows, a first window 1011 and a second window 1012 closer to the proximal end, and a third window 1013 and a fourth window 1014 closer to the distal end, respectively. The first window 1011 and the second window 1012 are disposed adjacent to each other in the circumferential direction of the stent 100. The third window 1013 and the fourth window 1014 are opposite along the circumferential spacing of the stent 100 and have a circumferential spacing from the first window 1011 and the second window 1012. Referring to the view of fig. 1, the paper-facing side of the holder 100 is referred to as the "front side", so that the first window 1011 and the second window 1012 are substantially facing the front side, and the third window 1013 and the fourth window 1014 are separated on both sides.

Referring to fig. 2, in some preferred embodiments, a plurality of connectors 103 are disposed on the back of the support 100, and the connectors 103 are spaced apart along the axial and circumferential directions of the support 100. The connecting piece 103 is used for penetrating the semi-release guide wire, so that the back of the bracket 100 is contracted, and the front window is opened, namely, the bracket 100 is controlled to be in a semi-release state which is not fully expanded, at the moment, the diameter of the bracket 100 is smaller than the diameter of a blood vessel, the position of the bracket 100 is convenient to adjust, the positions of the windows correspond to the positions of the branch blood vessels, and the release accuracy of the bracket 100 is improved. These connectors 103 may be annular members such as coils, holes formed in the cover 101, or slots formed in the support frame 102.

According to the above illustrated construction, the stent 100 is suitable for reconstructing the abdominal aorta, the first window 1011 and the second window 1012 correspond to the superior mesenteric artery and the dry celiac artery, and the third window 1013 and the fourth window 1014 correspond to the left and right renal arteries, namely: after stent 100 is released, first window 1011 and second window 1012 combine two branch stents for implantation into superior mesenteric artery and trunk, and third window 1013 and fourth window 1014 combine branch stents for implantation into left and right renal arteries to establish a blood flow path from the aorta to the branch vessels.

It will be appreciated that in some embodiments, not shown, the number of windows may be increased or decreased as desired. In addition, the connector 103 on the back of the bracket 100 may be omitted.

Referring again to fig. 3-16, the construction of a stent delivery device 200 is described in detail below, wherein the stent delivery device 200 is adapted to deliver a stent 100 of the construction described above with respect to fig. 1 and 2.

Referring first to fig. 3 and 4, the stent delivery device 200 generally comprises a sheath assembly 2, a delivery assembly 3, a pre-buried guide wire 4, and a locking assembly 5. Wherein the sheath assembly 2 and the delivery assembly 3 cooperate to receive the stent 100 in a contracted state and to deliver the stent 100 to a human blood vessel and control the release of the stent 100. The distal end of the pre-buried guide wire 4 is used to pass from the outside of the stent 100 through a window in the stent 100 into the inside of the stent 100 to guide the branch guide wire to pass out of the window of the stent 100 from the inside of the stent 100. The locking assembly 5 is used for controlling the locking and releasing of the embedded guide wire 4. Further, in order to cooperate with the connector 103 on the back of the stent 100 to achieve a half-release of the stent 100, the stent delivery device 200 further comprises a half-release guide wire (not shown in the figures) and a release slider 6 for controlling the half-release guide wire.

Generally, the sheath tube assembly 2 includes an inner sheath core and an outer sheath tube axially movably fitted around the inner sheath core, and an axially penetrating transport gap is formed between the outer sheath tube and the inner sheath core, and the transport gap is capable of accommodating the stent 100 in a contracted state.

The delivery assembly 3 is sleeved on the proximal end of the sheath assembly 2, and the delivery assembly 3 is provided with a control handle 31 for controlling the action of the sheath assembly 2 to release the stent 100.

Referring to fig. 5 to 7, a delivery passage 32 extending axially through the distal and proximal ends is provided in the delivery assembly 3, and the delivery passage 32 communicates with the delivery gap of the sheath assembly 2.

The proximal end of the delivery assembly 3 is provided with a push rod 33 and a push rod support 34 for fixedly supporting the push rod 33. The push rod 33 is tubular and may have one or more axially extending lumens disposed therein which serve as part of the delivery channel 32 for the pre-buried guide wire 4 to pass through.

The specific structure and the principle of the sheath assembly 2 and the delivery assembly 3 can be referred to in the related art, and will not be described herein.

The embedded guide wire 4 is penetrated in the conveying channel 32 of the conveying assembly 3, so that the distal end of the embedded guide wire 4 can enter the inner side of the bracket 100 from the outer side of the bracket 100 through a window on the bracket 100. The proximal end of the pre-buried guide wire 4 is threaded out of the push rod 33. In this embodiment, four pre-buried guide wires 4 are provided and respectively pass through each inner cavity of the push rod 33.

As shown in fig. 6 and 7, the four pre-buried guide wires 4 are divided into a first guide wire 41, a second guide wire 42, a third guide wire 43 and a fourth guide wire 44. After passing out of the push rod 33, the first and second guide wires 41, 42 extend side by side and are spaced apart from the third and fourth guide wires 43, 44, respectively. The first and second guide wires 41 and 42 correspond to the first and second windows 1011 and 1012 of the stent 100 in sequence, the third guide wire 43 corresponds to the third window 1013 of the stent 100, and the fourth guide wire 44 corresponds to the fourth window 1014 of the stent 100.

Referring to fig. 3 to 7, the locking assembly 5 is connected to the proximal end of the delivery assembly 3 and includes a slide member 51, a fixing member 52 and an operating member 53 which are sequentially sleeved from inside to outside. The slideway piece 51, the fixing piece 52 and the operating piece 53 are all tubular, the innermost slideway piece 51 is connected with the proximal end of the push rod supporting piece 34, and the inside of the slideway piece 51 is communicated with the conveying channel 32 for the penetration of the embedded guide wire 4.

Referring to fig. 5 and 6, the pre-buried guide wire 4 in the slideway member 51 extends proximally further out of the slideway member 51 and is clamped between the slideway member 51 and the fixing member 52, and the operation member 53 is operated by an operator to drive the fixing member 52 to compress or release the pre-buried guide wire 4.

In the present embodiment shown in fig. 7, the three structural members are formed of two parts, and the two parts may be connected and fixed by, for example, fastening, bonding, or the like. It will be appreciated that in other embodiments not shown, the three structural members may be formed separately in a tubular form, for example, by integral molding.

Referring to fig. 7 to 9, the slide member 51 is composed of an upper slide 5101 and a lower slide 5102 which can be fastened together, the cross sections of the upper slide 5101 and the lower slide 5102 are all approximately arc-shaped, and the circle center angles of the arc sections of the upper slide 5101 and the lower slide 5102 can be flexibly set according to practical situations.

Referring to fig. 8, three wire passing portions 511 are circumferentially spaced around the periphery of the upper slide 5101, and each wire passing portion 511 is configured to allow the pre-buried guide wire 4 to pass through the slide member 51 proximally. The circumferential intervals between two adjacent wire passing portions 511 may be the same or different, and the intervals may be set reasonably according to circumstances, preferably, the arrangement mode of the three wire passing portions 511 corresponds to the arrangement mode of four windows in the bracket 100 as much as possible, one wire passing portion 511 is arranged in the middle and is used for the first guide wire 41 and the second guide wire 42 to pass through together, and the other two wire passing portions 511 are respectively used for the third guide wire 43 and the fourth guide wire 44 to pass through at two sides of the row.

In some embodiments, the three wire passing portions 511 may also be listed on the upper slide 5101 and the lower slide 5102, for example, where two wire passing portions 511 are disposed on the upper slide 5101 and the other is disposed on the lower slide 5102. But for the whole of the chute member 51, the three wire passing portions 511 are arranged at intervals along the circumference of the chute member 51.

Each of the wire passing portions 511 extends a length in the axial direction of the upper run 5101. Specifically, the wire passing portion 511 includes a wire passing hole 5111 penetrating radially and a wire passing groove 5112 recessed inward from the outer circumference of the upper run 5101. The wire passing groove 5112 is located at the proximal end of the wire passing hole 5111 and communicates with the wire passing hole 5111. The wire passing holes 5111 provide a channel for the pre-buried wire 4 to pass out from the inside of the slide member 51, and the wire passing grooves 5112 provide a supporting function for the pre-buried wire 4.

Meanwhile, the wire passing groove 5112 is also used as a transition structure, so that the pre-buried guide wire 4 passes through the slide way piece 51 more gradually, the bending of the pre-buried guide wire 4 is reduced, and the axial movement of the pre-buried guide wire 4 is facilitated. Namely: when the embedded guide wire 4 passes through the slideway member 51, the radial dimension equivalent to the wall thickness of the slideway member 51 needs to be traversed, for the structure with the wire passing hole 5111 only, the embedded guide wire 4 directly contacts with the proximal end wall of the wire passing hole 5111 when moving axially, the bending and moving retardation problems of the embedded guide wire 4 are easily caused, and the process that the embedded guide wire 4 passes out from the inside of the slideway member 51 to the outside is elongated in the axial direction by arranging the wire passing groove 5112, so that the embedded guide wire 4 can smoothly pass out of the slideway member 51. On this basis, the depth of the wire passing groove 5112 is preferably gradually reduced in the proximal direction. The depth of the wire-passing groove 5112 may be reduced uniformly or non-uniformly.

In addition, the two side walls of the wire passing groove 5112 also play a role in guiding and limiting the axial movement of the embedded guide wire 4, and prevent the circumferential deflection of the embedded guide wire 4.

In the preferred embodiment, the wire passing groove 5112 is formed with a pressing groove 5113 extending circumferentially to both sides at a substantially middle region in the axial direction thereof, that is, the pressing groove 5113 is recessed through both side walls of the wire passing groove 5112. In the illustrated structure, the pressing groove 5113 has a substantially circular contour. In other embodiments, the pressing groove 5113 can take other shapes, such as oval, rectangular, etc.

Referring to fig. 9 again, two spaced routing holes 512 are provided on the periphery of the glidepath 5102, and the two routing holes 512 penetrate through the inner side and the outer side of the glidepath 5102 and extend obliquely from the distal end to the proximal end. The routing hole 512 allows the semi-releasable guidewire to pass through. Referring to fig. 10, the surface of the glidepath 5102 is further provided with an axially extending slide groove 513, the slide groove 513 extending through the proximal end of the glidepath 5102. The sliding groove 513 is internally provided with a blocking part 514 in a protruding way, and the sliding groove 513 is divided into a first section 5131 near the distal end and a second section 5132 near the proximal end, wherein the length of the first section 5131 is smaller than that of the second section 5132. The slide groove 513 is correspondingly provided for sliding engagement of the release slider 6, the specific engagement relationship will be described in detail below.

With reference to fig. 9 and 10, the proximal ends of the upper run 5101 and the lower run 5102 are provided with radially protruding engagement projections 515, respectively, which engagement projections 515 can be used to engage the securing member 52.

Referring to fig. 7, the fixing member 52 is divided into an upper fixing portion 5201 and a lower fixing portion 5202, and the structures of the upper fixing portion 5201 and the lower fixing portion 5202 are substantially the same, and the structure of the upper fixing portion 5201 illustrated in fig. 11 and 12 is mainly described below as a whole for the fixing member 52.

The mount 52 includes a main body 521 and a tail 522 at a proximal end of the main body 521. The outer peripheral dimension of the tail 522 is smaller than the outer peripheral dimension of the body 521, in the case where both the body 521 and the tail 522 are approximately circular, i.e., the outer diameter of the tail 522 is smaller than the outer diameter of the body 521.

The main body 521 has a larger axial length than the tail 522, the main body 521 can be sleeved and fixed on the proximal end of the delivery assembly 3, and the structure inside the main body 521 for matching with the delivery assembly 3 can be adjusted according to the external structure of the delivery assembly 3. The proximal end of the main body 521 is formed with a locking groove 5211, and the locking groove 5211 can be adapted to receive the mating protrusion 515 of the slide member 51, so that the main body 521 is sleeved on the slide member 51 for fixing.

The tail 522 has three slots 5221 extending through the proximal end, and a hold down arm 5222 is formed in each slot 5221 that is axially cantilevered and resilient. The hold-down arms 5222 are radially resiliently openable and closable under an external force. When the fixing member 52 is sleeved on the slideway member 51, the three pressing arms 5222 are respectively corresponding to the three wire passing portions 511 of the slideway member 51 one by one.

Wherein, the compressing arm 5222 has a space for the pre-buried guide wire 4 to axially move between the compressing arm 5222 and the wire passing part 511 in a free state; while the pressing arms 5222 press the embedded guide wire 4 to the wire passing portion 511 to lock the embedded guide wire 4 when receiving an inward radial force.

In this embodiment, three pressing arms 5222 are disposed at the tail 522 of the upper fixing portion 5201, and it is understood that the three pressing arms 5222 may be separated on the upper fixing portion 5201 and the lower fixing portion 5202, and only the pressing arms 5222 are required to correspond to the wire passing portion 511.

The hold down arms 5222 extend axially from the distal end to the proximal end, the proximal end of the hold down arms 5222 being free ends that are movable radially inward and outward when subjected to an external force based on the resiliency of the hold down arms 5222. The free end of the pressing arm 5222 is opposite to the wire passing groove 5112 of the wire passing portion 511, so that the pre-buried wire 4 can be pressed against the wire passing groove 5112.

Preferably, the hold down arms 5222 project inwardly from an inner hold down block 5223. In this embodiment, the inner pressing block 5223 has a cylindrical shape and a shape corresponding to the pressing groove 5113 of the wire passing portion 511. When the free ends of the pressing arms 5222 move radially inward, the inner pressing blocks 5223 move toward the pressing grooves 5113 to facilitate and accurately press-lock the pre-buried guide wire 4. In other embodiments, the inner push block 5223 can be omitted.

In addition, the outer surface of the free end of the pressing arm 5222 is also provided with an external pressing block 5224, so as to receive the pressing of the operating member 53.

In other embodiments, not shown, the hold-down arms 5222 can also take the form of cantilevered proximal ends that are fixed and distal ends that are free ends, as well as having the hold-down arms 5222 correspond to the wire passing portions 511 with the free ends opposite the wire passing slots 5112. In addition, the hold-down arms 5222 are not limited to extending in the axial direction, and may extend obliquely or circumferentially, for example, in other possible manners.

The three hold down arms 5222 can be the same length or can be different lengths. In this embodiment, one pressing arm 5222 in the middle has the largest length, and two pressing arms 5222 at both sides of the row have the same smaller length, and accordingly, an axial space is provided between the inner pressing block 5223 of the pressing arm 5222 in the middle and the inner pressing blocks 5223 of the other two pressing arms 5222.

In other possible ways, the hold-down arms 5222 can be made the same length, with the inner push blocks 5223 on different hold-down arms 5222 having axial spacing achieved by positioning the inner push blocks 5223 at different positions of the hold-down arms 5222. In other embodiments, the inner presser 5223 on the three presser arms 5222 can also be axially flush.

The tail 522 is provided with a projection 5225 circumferentially annular at a position close to the main body 521, and a locking groove 5226 is formed between the projection 5225 and the end surface of the main body 521. The convex ring 5225 is provided with a circumferentially extending limiting groove 5227, a central angle of the limiting groove 5227 can be set according to practical situations, and in this embodiment, the central angle of the limiting groove 5227 is 90 degrees, wherein one end of the limiting groove 5227 corresponds to a locking position, the middle of the limiting groove 5227 corresponds to a first unlocking position, and the other end of the limiting groove 5227 corresponds to a second unlocking position. That is, the first unlocking position is separated from the locking position and the second unlocking position by a central angle of 45 degrees. Corresponding to the locking position, the limiting groove 5227 is internally provided with a locking block 5228 in a protruding mode.

Referring to fig. 13 to 15, the proximal end of the operating member 53 protrudes inward to form a circumferential flange 531, and the flange 531 may be correspondingly engaged in the engagement groove 5226 of the tail 522 of the fixing member 52, so that the operating member 53 is rotatably sleeved on the tail 522 of the fixing member 52.

Adjacent to the flange 531, a limiting member 532 is disposed on an inner wall of the operating member 53, and the limiting member 532 is fittingly received in the limiting groove 5227 of the tail 522 and moves along the limiting groove 5227, so that the operating member 53 rotates between the locking position and the second unlocking position. In some variations, the positions of the stop 532 and the stop groove 5227 may be interchanged, i.e., the stop 532 may be provided on the tail 522 of the securing member 52 and the stop groove 5227 may be formed on the operating member 53.

The stopper 532 is provided with a matching locking groove 533 corresponding to the lock block 5228 so as to hold the operating member 53 in the locked position at the initial position. The stopper 532 has elasticity, or the whole of the operation member 53 has elasticity to make the stopper 532 elastically deformed, so that an operator can drive the stopper 532 to be unlocked from the locking groove 533 when turning the operation member 53 with force, thereby avoiding misoperation.

The inner wall of the operating member 53 is provided with three pressing portions 534 at intervals in the circumferential direction near the distal end, and these pressing portions 534 are each of a convex structure. For convenience of description, three pressing portions 534 are distinguished in terms of names, wherein one pressing portion 534 has a short length extending in the circumferential direction, and is referred to as a first pressing portion 5341. The two pressing portions 534 on both sides of the first pressing portion 5341 are separated from each other, and extend in the circumferential direction, and these pressing portions 534 are referred to as second pressing portions 5342. The first pressing portion 5341 and the second pressing portion 5342 have a space in the axial direction, and in this embodiment, the first pressing portion 5341 is closer to the proximal end than the second pressing portion 5342. The two second pressing portions 5342 are flush in the axial direction.

Referring to fig. 6, the three pressing portions 534 correspond to the three pressing arms 5222 of the fixing member 52 one by one, respectively. Similarly to the fixing member 52, the operating member 53 is formed by combining an upper operating portion 5301 and a lower operating portion 5302 having circular arc-shaped cross sections, and the three pressing portions 534 may be located in the same portion or may be separated from each other, and only need to correspond to the pressing arms 5222 respectively.

The correspondence between the pressing portion 534 and the pressing arm 5222 satisfies the following condition: when the operating member 53 is located at the locking position, the pressing portion 534 presses the corresponding pressing arm 5222, so that the pressing arm 5222 presses the embedded guide wire 4 at the wire passing portion 511 of the slideway member 51; when the operating member 53 is in the unlock position, the pressing portion 534 is displaced from the pressing arm 5222 to release the pressing of the corresponding pressing arm 5222.

In combination with the specific structure of the present embodiment, when the operating member 53 is located at the locking position, as shown in fig. 6, the first pressing portion 5341 correspondingly presses the pressing arms 5222 located in the middle on the fixing member 52, and the two second pressing portions 5342 respectively correspondingly press the pressing arms 5222 located on two sides on the fixing member 52, and accordingly, each pressing arm 5222 respectively presses the four pre-buried guide wires 4 at the corresponding wire passing portion 511. When the operating element 53 is located at the first unlock position, that is, when the operating element 53 is rotated 45 ° clockwise in the state shown in fig. 6, the first pressing portion 5341 is circumferentially offset from the corresponding pressing arm 5222 to release the pressing, and the pressing arm 5222 is located in a free state, so that the first guide wire 41 and the second guide wire 42, which are originally pressed, are released; at this time, since the second pressing portion 5342 has a large circumferential extension, the pressing of the corresponding pressing arm 5222 is still maintained, and the third and fourth guide wires 43 and 44 are still pressed. When the operating member 53 is located at the second unlock position, that is, when the operating member 53 is rotated clockwise by 90 ° in the state shown in fig. 6, the second pressing portion 5342 is circumferentially offset from the corresponding pressing arm 5222 to release the pressing, so that the two pressing arms 5222 are also located at the free state, and the third wire 43 and the fourth wire 44 are released.

In this embodiment, since the first pressing portion 5341 and the second pressing portion 5342 have an interval along the axial direction, the first pressing portion 5341 does not press against the non-corresponding pressing arm 5222 when the operating member 53 is in the second unlocked position, and unnecessary locking can be avoided.

According to the solution of the present embodiment, the first pressing portion 5341 and the second pressing portion 5342 release the pressing of the corresponding pressing arm 5222 at different unlocking positions, and the two second pressing portions 5342 release the pressing of the corresponding pressing arm 5222 at the same unlocking position.

In fact, according to the actual requirement, all the pressing portions 534 may be set to release the pressing of the corresponding pressing arms 5222 at the same unlocking position, or all the pressing portions 534 may be set to release the pressing of the corresponding pressing arms 5222 at different unlocking positions. Accordingly, the position and the extension length of each pressing portion 534 may be adaptively set.

Referring to fig. 4, the main body 521 is provided with first indication marks 5212 corresponding to the locking position, the first unlocking position and the second unlocking position, respectively. The first indication mark 5212 may be a pattern and/or text silk-screened on the surface of the main body 521, or a concave-convex structure provided on the surface of the main body 521 at a position different from other positions, etc. For example, referring to fig. 4, illustratively, the first indicator 5212 in the locked position is a "LOCK" letter and triangle pattern, the first indicator 5212 in the first unlocked position is a "1" letter and triangle pattern, and the first indicator 5212 in the second unlocked position is a "2" letter and triangle pattern.

Corresponding to the first indication mark 5212 provided on the main body 521 of the fixing member 52, a second indication mark is provided on the operating member 53, and when the operator is respectively located at the locking position, the first unlocking position and the second unlocking position, the second indication mark is respectively opposite to the corresponding first indication mark 5212, so that the current state of the operating member 53 can be indicated to the operator.

In some embodiments, not shown, the operating member 53 may also be axially slidably sleeved on the fixing member 52, and accordingly, the pressing portion 534 will press against or be offset from the pressing arm 5222, particularly the outer pressing block 5224 of the pressing arm 5222, by axial movement.

In the structure of the locking unit 5, the plurality of pressing portions 534 provided on the operating member 53 control the movement of the plurality of pressing arms 5222 of the fixing member 52 in one-to-one correspondence with each other, so that the plurality of pre-buried guide wires 4 can be pressed or released, respectively. The pressing or releasing of the embedded guide wires 4 can be controlled by only arranging one operation piece 53 on the bracket conveying device 200, so that the bracket conveying device 200 has simple structure and compact structure, and simultaneously, the operation of an operator is convenient. In particular, the pressing or releasing is realized by the rotation mode of the operation piece 53, the operation process of the operation piece 53 does not occupy extra space, and the structure is simpler as a whole.

In the above embodiment, the locking assembly 5 is described by taking a plurality of pre-buried guide wires 4 as an example, and in other possible embodiments, the structure of the locking assembly 5 is also applicable when the number of pre-buried guide wires 4 is one.

Referring again to fig. 5 and 16, the release slide 6 is located at the proximal end of the locking assembly 5, wherein the slide member 51 extends proximally beyond the securing member 52 and the operating member 53, and the release slide 6 is sleeved over the slide member 51 at the proximal ends of the securing member 52 and the operating member 53.

The release slide 6 can likewise be formed by a two-part snap-fit, wherein fig. 16 shows the internal structure of one part of this. The inner wall of the release slide 6 is provided with a limit protrusion 61 in a protruding manner, the limit protrusion 61 is matched with a sliding groove 513 on the slide member 51, and the limit protrusion 61 is accommodated in the sliding groove 513 and can move along the sliding groove 513, so that the release slide 6 is limited to move only in the axial direction. The length of the first segment 5131 of the sliding groove 513 is equal to the axial length of the limit projection 61, and the blocking portion 514 can stop the limit projection 61 from moving proximally, that is, in an initial state, the blocking portion 514 stops the limit projection 61 in the first segment 5131. When the release slider 6 needs to be moved, the operator pulls the release slider 6 to make the limit protrusion 61 pass over the blocking portion 514, so that the limit protrusion 61 can enter the second segment 5132, thereby avoiding misoperation. In some embodiments, the groove depth of the first segment 5131 is shallower than the groove depth of the second segment 5132, such that the bottom wall of the first segment 5131 abuts against the limiting protrusion 61, thereby avoiding the release slider 6 from being excessively loosened around the slide member 51 in the initial state.

An axially extending wire groove 62 is also provided in the release slider 6, the wire groove 62 being adapted to receive a semi-release wire. The semi-release guide wire penetrates from the wiring hole 512 of the glide slope 5102 of the slideway element 51, then enters the wiring groove 62, extends along the wiring groove 62, is fixed with the release slide block 6, and can be driven to move proximally by axially moving the release slide block 6 proximally relative to the slideway element 51.

The distal end of the semi-release guidewire is used to attach a connector 103 on the back of the stent 100, and during release of the stent 100, the semi-release guidewire constrains the diameter of the portion of the stent 100, allowing for semi-release of the stent 100. The connection of the semi-release wire to the connector 103 may be made by way of reference to the prior art. After the semi-release wire is pulled by the release slider 6 to release the connection with the connector 103, the stent 100 can be completely released.

From the above description, the method of using the stent system of the present embodiment is generally as follows, wherein the method of using the pre-buried guide wire 4 is mainly described.

1. In the initial state, the operating element 53 is in the locking position, and the second indicator mark on the operating element 53 points to the first indicator mark 5212 indicating the locking position, namely "LOCK" in the drawing, at this time, all the pre-buried guide wires 4 are pressed and cannot move axially. The limit projection 61 of the release slider 6 is stopped by the stopper 514 of the slide member 51 and the half release guide wire is locked.

2. The stent 100 is delivered to the human vascular abdominal aorta by the stent delivery device 200, and the stent 100 is released from the sheath assembly 2 by control of the delivery assembly 3. At this time, it is preferable to maintain the locked state of the semi-releasing wire, that is, the semi-releasing wire is connected to the connector 103 at the back of the stent 100 to bind the back of the stent 100, and the stent 100 is in the semi-releasing state. The windows of the stent 100 are opened, and the positions of the stent 100 are optionally adjusted, so that the four windows of the stent 100 correspond to the positions of the four branch vessels respectively. In some cases, the release slider 6 may also be pulled proximally to move the semi-release wire proximally to release the connection with the connector 103 of the stent 100 and fully release the stent 100.

3. The operator rotates the operating element 53 to point the second indicator on the operating element 53 to the first indicator 5212 indicating the first unlocked position, i.e., the "1" shown in the drawing, and at this time, the operating element 53 is in the first unlocked position, the first pressing portion 5341 releases the pressing of the corresponding pressing arm 5222, and the first guide wire 41 and the second guide wire 42 are released. The operator pushes the proximal ends of the first and second guide wires 41, 42 such that the distal ends of the first guide wire 41 enter the interior of the stent 100 from the first window 1011, the distal ends of the second guide wire 42 enter the interior of the stent 100 from the second window 1012, and the distal ends of the first and second guide wires 41, 42 extend from the distal ends of the stent 100. At this time, the third guide wire 43 and the fourth guide wire 44 remain locked.

4. The two branch guide wires are guided through the first window 1011 and the second window 1012 along the first guide wire 41 and the second guide wire 42, respectively, and enter the superior mesenteric artery and the celiac dry artery, respectively, i.e., the passages of the superior mesenteric artery and the celiac dry artery are established, and then the first guide wire 41 and the second guide wire 42 are taken out from the proximal end.

5. Pulling the release slide 6 proximally moves the semi-release wire proximally to release the connection with the connector 103 of the stent 100 and fully release the stent 100. And respectively releasing the branch stents which are correspondingly implanted into the superior mesenteric artery and the celiac artery along the two branch guide wires. If the stent 100 has been completely released before, the branched stent is released directly.

6. The operating element 53 is rotated to direct the second indication mark on the operating element 53 to the first indication mark 5212 indicating the second unlock position, i.e., "2" as shown, and at this time, the operating element 53 is in the second unlock position, the two second pressing portions 5342 release the pressing force on the corresponding pressing arms 5222, and the third guide wire 43 and the fourth guide wire 44 are released. The operator pushes the proximal ends of the third guide wire 43 and the fourth guide wire 44 such that the distal end of the third guide wire 43 enters the interior of the stent 100 from the third window 1013, the distal end of the fourth guide wire 44 enters the interior of the stent 100 from the fourth window 1014, and the distal ends of the third guide wire 43 and the fourth guide wire 44 extend from the distal end of the stent 100. At this point, the first and second guide wires 41, 42 have been removed and are not in the stent delivery device 200.

7. The other two branch guidewires are guided through the third window 1013 and the fourth window 1014 along the third guidewire 43 and the fourth guidewire 44, respectively, and into the left and right renal arteries, respectively, i.e. the channels of the left and right renal arteries are established, and then the third guidewire 43 and the fourth guidewire 44 are withdrawn proximally.

8. And respectively releasing the branch stents which are correspondingly implanted into the left and right renal arteries along the two branch guide wires.

According to the above description, in the present invention, the stent delivery device 200 is used for delivering the stent 100 with a window, and the pre-buried guide wire 4 disposed in the stent delivery device 200 can enter the inner side of the stent 100 through the window on the stent 100, so as to guide the branch guide wire to reach the branch vessel, and reduce the difficulty of the branch guide wire reaching the branch vessel. In the stent conveying device 200, the locking component 5 controls the locking and releasing of the embedded guide wires 4, so that the device is particularly suitable for the stent 100 with a plurality of windows, and more branch stents can be connected by adopting the stent 100 with a plurality of windows, thereby reducing the occurrence of internal leakage and having more positive significance clinically.

While the invention has been described with reference to several exemplary embodiments, it is to be understood that the terminology used is intended to be in the nature of words of description and of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.

Claims (19)

1. A stent delivery device, comprising:

a delivery assembly having a delivery passage axially therethrough;

the embedded guide wire is arranged in the conveying channel in a penetrating way, and the proximal end of the embedded guide wire penetrates out of the proximal end of the conveying channel; a kind of electronic device with high-pressure air-conditioning system

A locking assembly comprising:

the slideway piece is connected to the proximal end of the conveying assembly and communicated with the conveying channel, and a wire passing part for the embedded guide wire to pass out of the slideway piece is arranged on the periphery of the slideway piece;

the fixing piece is fixedly sleeved on the slideway piece, and is provided with an elastically overhanging compression arm which is radially opposite to the wire passing part; a kind of electronic device with high-pressure air-conditioning system

The operating piece is movably sleeved on the fixing piece and can move between a locking position and an unlocking position, and a pressing part is arranged in the operating piece in a protruding mode; when the operating piece is positioned at the locking position, the pressing part is propped against the pressing arm, so that the pressing arm presses the embedded guide wire at the wire passing part; when the operating piece is positioned at the unlocking position, the pressing part is staggered with the pressing arm, so that the pressing of the pressing arm is released; the embedded guide wires are provided with a plurality of guide wires; the slide way piece is provided with a plurality of wire passing parts at intervals along the circumferential direction, the fixing piece is provided with a plurality of pressing arms at intervals along the circumferential direction, and the operating piece is provided with a plurality of pressing parts at intervals along the circumferential direction;

The operation piece is rotationally sleeved on the fixing piece and moves between a locking position and an unlocking position, and the operation piece is rotated to control the compressing or releasing of the embedded guide wires.

2. The stent delivery apparatus according to claim 1, wherein one of the fixing member and the operating member is provided with a circumferentially extending limit groove, and the other is provided with a limit member in a protruding manner; the limiting piece is adaptively accommodated in the limiting groove and moves along the limiting groove, so that the operating piece rotates between a locking position and an unlocking position.

3. The stent delivery device according to claim 2, wherein a locking block is provided in the limiting groove corresponding to the locking position, a matching locking groove is provided on the limiting member corresponding to the locking block, and the limiting member has elasticity.

4. The stent delivery device of claim 1, wherein at least one pre-buried guide wire is threaded into each wire passing portion, and the pressing portion, the pressing arm and the wire passing portion are arranged in one-to-one correspondence.

5. The stent delivery device of claim 4, wherein the plurality of pressing portions have first and second pressing portions having different circumferential extension lengths; the unlocking positions are multiple, and the first pressing part and the second pressing part release the pressing of the corresponding pressing arms at different unlocking positions.

6. The stent delivery device of claim 5, wherein the first pressing portion and the second pressing portion are axially spaced apart.

7. The stent delivery device of claim 4, wherein at least two of the plurality of pressing portions release the pressing of the corresponding pressing arm in the same unlocking position.

8. The stent delivery device of claim 1, wherein the compression arm is cantilevered toward a proximal end that is a free end opposite the compression portion.

9. The stent delivery device of claim 8, wherein the outer surface of the free end is provided with an external pressing block.

10. The stent delivery device of claim 1, wherein the wire passing portion comprises a wire passing hole passing radially therethrough and a wire passing groove recessed inwardly from an outer circumference of the chute member; the wire passing groove is positioned at the proximal end of the wire passing hole and is communicated with the wire passing hole; the pressing arm is at least opposite to the wire passing groove and can press the embedded guide wire to the wire passing groove.

11. The stent delivery device of claim 10, wherein the wire passing slot extends circumferentially to form a pressing slot; the pressing arm protrudes inwards to form an inner pressing block, and the pressing block is opposite to the pressing groove and is adaptive in shape.

12. The stent delivery device of claim 10, wherein the depth of the wire-passing groove tapers in a proximal direction.

13. The stent delivery device of any one of claims 1-12, wherein the anchor comprises a body and a tail at a proximal end of the body, the tail having a peripheral dimension that is less than a peripheral dimension of the body; the tail part is provided with a slot penetrating through the proximal end, and the pressing arm is positioned in the slot; the operating piece is sleeved at the tail part.

14. The stent delivery device of any one of claims 1-12, wherein the securing member is provided with first spaced apart indicators corresponding to the locked and unlocked positions, and wherein the operating member is provided with a second indicator that is opposite the corresponding first indicator when the operating member is in the locked and unlocked positions, respectively.

15. The stent delivery device of any one of claims 1-12, further comprising a semi-release guidewire and a release slider; the semi-release guide wire penetrates through the conveying channel, and the proximal end of the semi-release guide wire penetrates out of the proximal end of the conveying channel and is fixedly connected with the release sliding block; the release slider is connected to the proximal end of the locking assembly and is capable of moving axially relative to the locking assembly to drive the semi-release wire to move proximally.

16. The stent delivery device of claim 15, wherein the ramp member extends proximally beyond the securing member, the ramp member having an axially extending chute; the release slider is sleeved on the slideway piece, a limit protruding part is protruding from the release slider, and the limit protruding part is accommodated in the chute.

17. The stent delivery device of claim 16, wherein a stop is protruding into the chute near the distal end, the stop being capable of stopping proximal movement of the stop tab.

18. The stent delivery device of claim 17, wherein the chute is divided by the blocking portion into a first section near the distal end and a second section near the proximal end, the first section having a lesser groove depth than the second section.

19. A stent system comprising a stent and a stent delivery device as claimed in any one of claims 1 to 18, wherein a window is provided in the periphery of the stent, the distal end of the pre-buried guide wire passing through the window into the interior of the stent.