CN218979357U

CN218979357U - Plastic dilator for dilating arterial stent

Info

Publication number: CN218979357U
Application number: CN202221506817.2U
Authority: CN
Inventors: 庄晖; 王焱; 姜程文; 高泽明; 梁玉晨
Original assignee: Chenxing Nantong Medical Instrument Co ltd
Current assignee: Chenxing Nantong Medical Instrument Co ltd
Priority date: 2022-06-16
Filing date: 2022-06-16
Publication date: 2023-05-09
Anticipated expiration: 2032-06-16

Abstract

The utility model discloses a molding expander for expanding an arterial stent, which is provided with a conveying pipe; the expanding ball cage, the proximal end of which is fixedly connected with the distal end of the conveying pipe, is of a cage-shaped structure surrounded by expanding silk strips, and is provided with a plurality of holes on the surface; the central rod sequentially penetrates through the conveying pipe and the expansion ball cage, and the distal end of the central rod is fixedly connected with the distal end of the expansion ball cage; and the guide structure is fixed at the distal end of the central rod and is used for controlling the advancing direction of the central rod. According to the utility model, the arterial stent is expanded by the expansion ball cage with the leak holes, even if the expansion ball cage is pushed by high-pressure high-speed blood flow, the arterial stent can be continuously fixed in situ due to no resistance to the blood flow caused by the design of the leak hole structure; in addition, by the guide structure, the central rod can be bent towards a required preset direction to adapt to different directions of the bent blood vessel by controlling the stay wires of the distal stay wire group and/or the middle stay wire group.

Description

Plastic dilator for dilating arterial stent

Technical Field

The utility model belongs to the technical field of medical appliances, and particularly relates to a molding expander for expanding an arterial stent.

Background

Aortic aneurysms refer to abnormal expansion of the wall of the aorta, either locally or diffusely. Aortic aneurysms can stress surrounding organs causing symptoms, with neoplastic rupture being a major hazard. Aortic aneurysms often occur in the ascending aortic arch, the thoracic descending aorta, the thoracoabdominal aorta, and the abdominal aorta. Aortic aneurysms can be structurally classified into true aortic aneurysms, pseudo-aortic aneurysms, and dissected aortic aneurysms.

Aortic aneurysms cause increased pressure inside the blood vessel and thus develop progressive enlargement, with eventual rupture if developed over time, the larger the tumor mass, the greater the likelihood of rupture. Embolism is another complication. The aortic dissection is a dissection of the aortic dissection due to local rupture of the aortic intima and high pressure blood flow rushing into the vessel wall, resulting in a media tear (the dissection of the middle layer is usually at the 1/3 and outer 2/3 interface of the middle layer), dividing the complete aortic dissection wall structure into two parts, forming a dissection chamber in the dissection gap between the inner and outer walls of the dissection. For distinction from the aortic lumen, the dissection lumen is called the false lumen and the aortic lumen is called the true lumen.

At present, an intra-arterial cavity treatment operation has been developed at home and abroad, namely, a minimally invasive method is adopted, and an arterial graft stent, namely, an arterial stent or a vascular stent is implanted into a diseased artery by means of a vascular cavity so as to treat arterial diseases and improve blood supply, thereby achieving the treatment purpose. When in use, the arterial tectorial stent is axially compressed and then is loaded in the conveyor, and the arterial tectorial stent is conveyed to the diseased artery through the smaller femoral artery, iliac artery and brachial artery by the conveyor and then released, and the arterial disease part is isolated from blood flow due to the elastic force of the arterial tectorial stent which is automatically restored into a straight tube shape and is tightly attached to the inner wall of the aorta, so that the treatment purpose is achieved.

When the aortic stent graft is released in vivo, some wall-attached thrombi, plaques and twists, and some interlayer true cavities are not opened in time, so that the arterial stent graft and a blood vessel cannot be attached and cannot be unfolded. This method of intra-luminal pressure is now required to facilitate the attachment and deployment of the stent graft. A common approach is balloon inflation, typically a caliant balloon from Medtronic corporation, a coda balloon from cook corporation, which is a soft material, and is inflated by the infusion of saline. In aortic stent surgery, a temporary pacemaker is not usually used for rapid heart rate pacing to reduce blood pressure, so that the balloon is likely to shift due to high pressure and high speed blood flow in the aorta after balloon expansion, and the balloon can be seriously dragged to move backwards, twist and bend.

Disclosure of Invention

Aiming at the technical problems that the balloon in the prior art can shift and even lead the balloon to drag the stent to shift backwards, twist and bend, the utility model aims to provide a novel molding dilator for dilating an arterial stent.

The molding expander for expanding an arterial stent of the present utility model has:

a conveying pipe;

the proximal end of the expansion ball cage is fixedly connected with the distal end of the conveying pipe, the expansion ball cage is of a cage-shaped structure surrounded by expansion silk strips, and the surface of the expansion ball cage is provided with a plurality of leakage holes;

the central rod sequentially penetrates through the conveying pipe and the expansion ball cage, and the distal end of the central rod is fixedly connected with the distal end of the expansion ball cage.

Preferably, the expanded filaments and the expanded filaments or the expanded filaments themselves are orderly or unordered cross-connected to form the cage structure, and the cross-connected expanded filaments form a cavity, so that a plurality of leak holes are distributed on the surface of the expanded ball cage.

Preferably, the expanded filaments are one or more.

Preferably, the order means:

a distance of fixed interval is formed between two adjacent expanded yarns;

alternatively, two adjacent expanded yarns are crossed with each other.

Preferably, the order means:

the expanded yarn is provided with a plurality of first yarns and a plurality of second yarns, wherein the first yarns are arranged between two adjacent expanded yarns at a certain interval, the second yarns are arranged between two adjacent expanded yarns at a certain interval, and the first yarns and the second yarns are in cross connection to form the cage-shaped structure.

Preferably, the expanded yarn further has one or more third yarns, and the third yarns and the first yarns and the second yarns are orderly or unordered cross-connected to form the cage structure.

It is preferred that the first and second heat sinks,

the expansion silk is braided silk, and the main body of the expansion ball cage is braided into the cage-shaped structure by the braided silk;

the distal end of the expansion ball cage is a distal circular tube woven by weaving wires, at least one weaving wire of the main body of the expansion ball cage is integrally connected with the distal circular tube, and the distal circular tube is fixedly sleeved outside the distal end of the central rod;

the proximal end of the expansion ball cage is a proximal circular tube formed by braiding braided wires, at least one braided wire of the main body of the expansion ball cage is integrally connected with the proximal circular tube, and the proximal circular tube is fixedly sleeved outside the distal end of the conveying tube.

It is preferred that the first and second heat sinks,

the expansion thread is a tube thread with rebound energy, and the expansion ball cage is formed by cutting a straight tube with rebound energy into the tube thread along the axial direction by laser and performing heat setting into a cage-shaped structure. More preferably, the expansion ball cage is formed by spirally cutting a straight pipe with rebound performance into a pipe wire along the axial direction by laser and performing heat setting to form a cage-shaped structure.

Preferably, the expansion ball cage has:

the distal end fixing sleeve is sleeved outside the distal end circular tube, and the distal end circular tube fixing sleeve of the expansion ball cage is sleeved outside the distal end of the center rod;

the proximal end fixing sleeve is sleeved outside the proximal end circular tube, and the proximal end circular tube fixing sleeve of the expansion ball cage is wrapped outside the distal end of the conveying tube.

Preferably, the molding expander further has:

and a guide structure fixed at the distal end of the central rod for controlling the advancing direction of the central rod.

Preferably, the guide structure has:

a guide head secured within the distal end of the central rod;

the far-end stay wire group consists of a plurality of stay wires, the far-end stay wire group is arranged in the hollow of the central rod in a penetrating way, and the far ends of the plurality of stay wires of the far-end stay wire group are fixed on the far-end peripheral wall of the central rod and are uniformly distributed in the circumferential direction.

It is preferred that the first and second heat sinks,

the distal end of the central rod is provided with a guide ring, and the distal ends of a plurality of stay wires of the distal stay wire group are fixed on the peripheral wall of the guide ring and are uniformly distributed in the circumferential direction.

Preferably, the guide structure further has:

the middle section group of acting as go-between of a plurality of groups, every group middle section group of acting as go-between is acted as go-between by a plurality of groups respectively, a plurality of groups middle section group of acting as go-between all wears to establish inside the cavity of center pole, the distal end of different middle section groups of acting as go-between is fixed on the middle section perisporium of center pole along the even interval of axial, the distal end of a plurality of stay-between in the same middle section group of acting as go-between is in evenly distributed in the middle section perisporium circumferencial direction of center pole.

It is preferred that the first and second heat sinks,

the distal end of the expansion ball cage is a distal circular tube, and the distal circular tube is fixedly sleeved outside the distal end of the central rod;

the proximal end of the expansion ball cage is a proximal circular tube, and the distal end of the conveying pipe is fixedly sleeved with the proximal circular tube.

Preferably, the expansion ball cage has:

the proximal end fixing sleeve is sleeved outside the proximal end circular tube, and the proximal end circular tube fixing sleeve of the expansion ball cage is sleeved outside the distal end of the conveying tube through the proximal end fixing sleeve.

Preferably, the guide head has:

a cylindrical body end fixedly embedded in the distal end of the central rod;

the round table-shaped head end is integrally connected with the cylindrical body end, and the outer diameter of the proximal end face of the round table-shaped head end is consistent with the outer diameter of the conveying system and is used for guiding the advancing direction of the central rod and the conveying pipe.

Preferably, a plurality of through wire holes and wire buckles are evenly distributed on the annular wall of the guide ring at intervals, and the distal ends of a plurality of wires of the distal wire pulling group respectively penetrate through the wire holes and are fixedly connected with the wire buckles.

Another object of the present utility model is also to provide a molding dilator for dilating an arterial stent, having:

a conveying pipe;

the proximal end of the expansion ball cage is fixedly connected with the distal end of the conveying pipe;

a hollow soft central rod sequentially penetrating through the conveying pipe and the expansion ball cage, wherein the distal end of the central rod is fixedly connected with the distal end of the expansion ball cage;

Preferably, the guide structure has:

a guide head secured within the distal end of the central rod;

It is preferred that the first and second heat sinks,

Preferably, the guide structure further has:

It is preferred that the first and second heat sinks,

Preferably, the expansion ball cage has:

Preferably, the guide head has:

a cylindrical body end fixedly embedded in the distal end of the central rod;

and the round table-shaped head end is integrally connected with the cylindrical body end and is used for guiding the advancing directions of the central rod and the conveying pipe.

Compared with the prior art, the utility model has the beneficial effects that:

1) The plastic expander for expanding the arterial stent has the advantages that the arterial stent is expanded by adopting the expansion ball cage with certain toughness and elasticity, so that the arterial stent is attached to the inner wall of an aortic vessel. The leak holes are distributed on the expansion ball cage, even if the expansion ball cage is pushed by high-pressure high-speed blood flow, the high-pressure high-speed blood flow cannot be caused to be resistant due to the leak hole structural design, the arterial stent can be well fixed in situ continuously, and the phenomena of backward movement, distortion, and the like cannot occur.

2) The plastic stent for expanding the arterial stent is provided with the guide structure, and the distal section of the whole expansion ball cage, which is far away from the central axis, is used for controlling the central tube to better conform to the rugged vascular inner wall and attach to the vascular stent by controlling the stay wires of the distal stay wire group and/or the middle stay wire group, so that the vascular stent can attach to the vascular inner wall more according to the bending condition of the vascular inner wall, the central rod can be bent in a regulating way towards a required preset direction to adapt to different bending vascular directions, and meanwhile, the bending phenomenon caused by blood flow impact can be corrected.

3) The blood vessel inner wall has the scope of opening of thrombus support that irregular shapes such as thrombus, blood package exist, and the expansion main part can play the effect of opening well, separates this department through vascular support and blood simultaneously, in time appears the blood vessel inner wall damage, and the blood that has the protection of vascular support can normally circulate, can not cause the vascular rupture even danger of big hemorrhage.

Drawings

FIG. 1 is a schematic perspective view of a molding expander of the present utility model;

FIG. 2 is an enlarged partial schematic view of FIG. 1;

FIG. 3 is a schematic side view of a molding expander of the present utility model;

FIG. 4 is a schematic side view of an exemplary expanded ball cage of the utility model;

FIG. 5 is a schematic side view of the expanded ball cage of the example of FIG. 4 further expanded and supported;

FIG. 6 is a schematic perspective view of FIG. 5;

FIG. 7 is a schematic side view of another example expanded ball cage of the utility model;

FIG. 8 is a schematic side view of another exemplary expanded ball cage of the utility model;

FIG. 9 is a schematic side elevational view of FIG. 8;

FIG. 10 is a schematic view of the distal end of the plastic expander of the present utility model in perspective;

FIG. 11 is a schematic cross-sectional view of a molding expander of the present utility model;

fig. 12 is an enlarged schematic view of the distal end section of the plastic expander of the present utility model.

Detailed Description

Other advantages and effects of the present utility model will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present utility model with reference to specific examples. The utility model may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present utility model. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.

In the field of interventional medical devices, "distal" is defined as the end of the procedure that is distal to the operator, and "proximal" is defined as the end of the procedure that is proximal to the operator.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the device can be mechanically connected, electrically connected and communicated; either directly, or indirectly, through intermediaries, may be in communication with each other, or may be in interaction with each other, unless explicitly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, "axial" generally refers to the axial direction of the distal end and the proximal end, but sometimes "axial" may also refer to the axial direction of the axially symmetric element itself. "radial" refers to a direction perpendicular to the "axial direction".

As shown in FIG. 1, the stent graft of the present utility model has a delivery tube 10, a central rod 20, a stent balloon 30, and a guide structure 40.

The delivery tube 10 is a long hollow tube made of PEBAX, PE, stainless steel, etc., and has a length of about 400mm to 800mm, an inner diameter of 1.5 to 4.0mm, and an outer diameter of 1.8 to 5.0mm.

The central rod 20 is also a long hollow hose made of PEBAX, PE, stainless steel, etc., and has a length of about 400mm to 800mm, an inner diameter of 0.5 to 1.5mm, and an outer diameter of 1.0 to 3.0. The central rod 20 is arranged in the hollow interior of the conveying pipe 10 in a penetrating way, a distal section of the central rod 20 can protrude out of a part of the conveying pipe 10, the central pipe 20 is coaxial with the conveying pipe 10, the inner diameter of the conveying pipe 10 is larger than the outer diameter of the central pipe 20, and the central rod and the conveying pipe can move relatively.

As shown in fig. 2 to 3, the expanded ball cage 30 is expanded to the most expanded state in a natural state, and is substantially spherical or similar to a sphere, or may be elliptical or similar to an ellipsoid, or other bulge shapes are possible. The material can be cobalt-chromium alloy, nickel-titanium material, and the length is about 10 to 50mm for the long axis and 5.0 to 20mm for the short axis. In the contracted state, the sheath may have any shape, for example, may be substantially elongated, and may be suitably accommodated in the sheath of the delivery system. The expanded ball cage 30 has a cage-like structure surrounded by expanded filaments 31. The cage structure can be a cage structure formed by orderly or unordered cross connection between the expanded yarn 31 and the expanded yarn 31, or can be a cage structure formed by orderly or unordered cross connection between one section and the other section in each section of the expanded yarn 31. The number of the expanded yarns 31 may be one or two or more. The ordered cross connection can be a distance between two adjacent expanded filaments 31 with a fixed distance, for example, as shown in fig. 4-6, a nickel-titanium tube with an outer diameter of 3-9 mm and a wall thickness of 0.1-0.15 mm is cut by laser, then is plugged into a mould, restrained by copper wires, formed by heat setting, formed into a strip shape, and then expanded into a spherical or ellipsoidal shape in the shape of a supported lantern; for example, as shown in fig. 7, two adjacent expanded yarns 31 may intersect with each other; as shown in fig. 8 to 9, the expanded yarn 31 itself may be spaced apart from the adjacent one by a predetermined distance; or alternatively, two adjacent segments may be crossed (not shown); for example, the expanded yarn may have a first yarn with a certain distance between two adjacent expanded yarns and a second yarn with a certain distance between two adjacent expanded yarns, and the first yarn and the second yarn are cross-connected to form a cage structure (not shown). In general, any cross-connect that may exhibit a certain regularity may be an ordered cross-connect of the present utility model. Of course, the cross-connect of the present example may also be a random cross-connect that cannot exhibit regularity, and the object of the present utility model may also be achieved. For the orderly cross connection, more orderly cross connection and unordered cross connection expanded yarns can be provided on the basis of the orderly connection, for example, the expanded yarn also has one or more third yarns, and the third yarns, the first yarns and the second yarns are orderly or unordered cross connected to form a cage structure. In the manufacturing process of the expansion ball cage 30, the nickel-titanium tube can be cut into a grid shape when being cut by laser, and a plurality of circles of nickel-titanium strips can be reserved in the radial direction of the grid shape, so that the supporting force of the expansion ball cage 30 main body of the whole plastic molding device is stronger.

Voids are left between the ordered or unordered cross-linked expanded filaments 31, thereby filling the surface of the expanded ball cage 30 with weep holes 32. After ordered or unordered cross-connection according to the utility model, the holes 32 may be elongated, diamond-shaped, square, rectangular, trapezoid, etc., and the size of the holes 32 is not limited. So long as these weep holes 32 provide a pathway for high pressure, high velocity blood to flow through.

Because the expanded ball cage 30 of this example is formed by orderly and/or unordered cross connection of the expanded filaments 31, the expanded filaments 31 are made of a material with relatively large toughness and elasticity, and thus can be compressed to any shape with very small elasticity before being delivered to the aortic blood vessel in vivo, preferably to a cylindrical shape, then placed in a delivery system, and after being released at the target arterial blood vessel delivered to the human body, the expanded ball cage 30 can be controlled to expand to the highest expansion state within the internal range of entering the vascular stent due to the elastic toughness of the material, the control part operation and the like, and the better expansion state is spherical or elliptical-like.

The proximal end of the expansion ball cage 30 is a proximal circular tube 33, and at least one expansion strand 31 is fixedly connected, preferably integrally formed, with the proximal circular tube 33. The proximal circular tube 33 is fixedly sleeved outside the distal end of the delivery tube 10 so as to be fixedly connected with the delivery tube 10. The distal end of the expansion ball cage 30 is a distal circular tube 34, and at least one expansion strand 31 is fixedly connected with the distal circular tube 34, preferably integrally formed. An example is, for example, that the expanded filaments are braided filaments and that the body of expanded gabion 30 is braided in a cage-like structure; the distal end of the expansion ball cage 30 is a distal circular tube 34 woven by weaving wires, at least one weaving wire of the main body of the expansion ball cage 30 is integrally connected with the distal circular tube 34, and the distal circular tube 34 is fixedly sleeved outside the distal end of the central rod; the proximal end of the expansion ball cage 30 is also a proximal circular tube 33 formed by braiding wires, at least one braiding wire of the main body of the expansion ball cage 30 is integrally connected with the proximal circular tube 33, and the proximal circular tube 33 is fixedly sleeved outside the distal end of the conveying pipe. Another example is that the expanded yarn is a tube yarn with rebound resilience, and the expanded ball cage 30 is a straight tube with rebound resilience which is cut into tube yarns along the axial direction by laser and heat-set into a cage-like structure. The straight pipe with rebound property can be spirally cut into pipe wires along the axial direction by laser and heat-set into a cage-shaped structure. The distal barrel 34 is fixedly wrapped around the distal end of the central rod 20 for fixedly connecting to the distal end of the central rod 20. The expansion ball cage 30 has a distal end fixing sleeve 35 and a proximal end fixing sleeve 36, the distal end fixing sleeve 35 and the proximal end fixing sleeve 36 can be made of polymer materials such as PEBAX, if the proximal end circular tube 33 and the distal end circular tube 34 of the expansion ball cage 30 are woven by braiding wires, the circular tubes are provided with leakage holes, and the outer surface is sleeved with the distal end fixing sleeve 35 and the proximal end fixing sleeve 36 made of PEBAX, so that the proximal end circular tube 33 and the distal end circular tube 34 are fixed in a hot melt fixing mode. Specifically, the distal end fixing sleeve 35 is wrapped around the distal end circular tube 34, and the distal end circular tube 34 of the expansion ball cage 30 is fixedly wrapped around the distal end of the central rod 20 by the distal end fixing sleeve 35. Similarly, the proximal circular tube 33 is wrapped around the proximal circular tube 36, and the proximal circular tube 33 of the expansion ball cage 30 is fixedly wrapped around the distal end of the delivery tube 10 by the proximal fixed sleeve 36. That is, the proximal end of the expansion ball cage 30 is sleeved with the central rod 20, the delivery tube 10, the proximal round tube 33 of the expansion ball cage 30 and the proximal fixed sleeve 36 in sequence from inside to outside, and other adjacent two can be fixedly connected by hot melt bonding, gluing, welding and the like besides the movable sleeved mode adopted between the central rod 20 and the delivery tube 10. The distal end of the expansion ball cage 30 is provided with a cylindrical end 411 of the guide head 41, the central rod 20, the distal circular tube 34 of the expansion ball cage 30 and the distal fixing sleeve 35 in sequence from inside to outside, and the adjacent two can be fixedly connected by adopting a hot melt bonding, gluing, welding and the like.

As shown in fig. 10-12, a guide structure 40 is secured to the distal end of the central rod 20 for controlling the direction of advancement of the central rod 20. The guide structure has a guide head 41, a distal pull string set and a plurality of sets of intermediate pull string sets.

A guide head 41 is secured within the distal end of the central rod 20. The guide head 41 has a cylindrical body end 411 fixedly embedded inside the distal end of the central rod 20. The guide head 41 further has a truncated cone-shaped head end 412 integrally connected to the cylindrical body 411, and the outer diameter of the proximal end surface of the truncated cone-shaped head end 412 is identical to the outer diameter of a sheath of a delivery system (the sheath of the delivery system is not shown) so as to be coupled with the sheath of the delivery system during delivery, such that the central shaft 20 and the expansion ball cage 30 are sealed within the sheath of the delivery system. The guide head 41 serves to guide the advancing direction of the center rod 20 and the conveying pipe 10.

The distal wire set, which consists of a number of wires 42, for example 4 wires as shown, is threaded through the hollow interior of the central rod 20. The distal end of the central rod 20 is provided with a guide ring 22, and a plurality of through wire holes 221 and wire buckles 222, for example, 4 wire holes 221 and 4 wire buckles 222 are evenly distributed on the annular wall of the guide ring 22 at intervals, and a certain included angle formed by the adjacent 2 wire holes 221 and the axle center in the circumferential direction is formed, so that the uniform distribution is shown on the circumference of the annular wall. The distal ends of the plurality of pull wires 42 of the distal pull wire set respectively pass through the wire holes 221 and are fixedly connected with the wire buckle 222. Thus, the 4 wires 42 of the distal wire set also exhibit an even distribution in the circumferential direction.

In another example, not shown, each of the middle section stay wire groups is also composed of a plurality of other stay wires, the plurality of middle section stay wire groups are all arranged in the hollow of the central rod in a penetrating manner, the distal ends of the middle section stay wire groups of different groups are fixed on the middle section peripheral wall of the central rod at uniform intervals along the axial direction, and the distal ends of the plurality of stay wires in the same middle section stay wire group are uniformly distributed in the circumferential direction of the middle section peripheral wall of the central rod.

The working principle of the molding expander for expanding arterial stents of the present utility model is such,

before delivery, the distal end of the central rod 20 of the present utility model is pulled out of the distal end of the delivery tube 10 by a distance such that the expansion balloon 30 fixedly connected between the distal ends of the central rod 20 and the delivery tube 10 is stretched to a minimum state, i.e., an unexpanded expanded state, the central rod 20, the delivery tube 10 and the expansion balloon 30 are all threaded into the sheath of the delivery system, and the delivery system delivers the whole to the target site of the arterial vessel, which has been previously delivered with the arterial stent not fully expanded. When the molding expander is pushed out of the distal end of the sheath of the delivery system, the expansion ball cage 30 between the distal end of the central rod 20 and the distal end of the delivery tube 10 can expand and dilate to the most bulging degree due to the self material properties as it is not constrained by the sheath. Then the central rod 20 is pulled back by the operating handle, the expansion ball cage 30 is compressed in the axial direction, the axial length is shortened, the vertical and axial diameters are extruded to be longer, and the arterial stent graft with the peripheral not fully expanded can be further pushed away in the process that the middle diameter is pushed to the longest extent, so that the arterial stent graft can be completely adhered to and unfolded from an arterial vessel. The relative movement of the central rod 20 and the delivery tube 10 adjusts the degree of deformation expansion of the expansion ball cage 30, thereby adjusting the maximum inside diameter of the shaper body, which serves to adequately conform the aortic stent to the aortic wall.

And since the stent graft of the present utility model is provided with the guide structure 40, the center rod 20 can be bent in a desired predetermined direction to adapt to different directions of bending blood vessels (or to adjust the center rod 20 bent by the impact of blood flow) by controlling the pull wires of the distal and middle pull wire sets.

The specific embodiments described herein are offered by way of example only to illustrate the spirit of the utility model. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the utility model or exceeding the scope of the utility model as defined in the accompanying claims.

Claims

1. A molding dilator for dilating an arterial stent, comprising:

a conveying pipe;

2. A stent graft as defined in claim 1 wherein said guide structure has:

a guide head secured within the distal end of the central rod;

3. A stent graft as defined in claim 2, wherein

4. A stent graft as defined in claim 2 wherein said guiding structure further comprises:

5. A stent graft as defined in claim 2, wherein

6. A molding expander for expanding arterial stents as claimed in claim 5, wherein the expansion ball cage has:

7. A molding dilator for dilating an arterial stent as defined in claim 6, wherein said guide head has:

a cylindrical body end fixedly embedded in the distal end of the central rod;

8. A molding expander for expanding an arterial stent as claimed in claim 3, wherein a plurality of wire holes and wire buckles are evenly distributed on the annular wall of the guide ring at intervals, and distal ends of a plurality of wires of the distal stay wire group respectively penetrate through the wire holes and are fixedly connected with the wire buckles.