CN118178073B - Carotid artery stent system capable of being placed through radial artery - Google Patents

Abstract

The invention discloses a carotid artery stent system capable of being placed through a radial artery, which comprises a conveying component, a stent, a guide wire and a pushing guide wire component, wherein the conveying component comprises an outer tube, the pushing guide wire component is used for placing the stent into the carotid artery through the outer tube under the guidance of the guide wire, the outer tube is a composite braided tube, the composite braided tube comprises a first braided wire and a second braided wire, the winding directions of the first braided wire and the second braided wire are opposite, the first braided wire and the second braided wire are configured to be different in bending stress, and the carotid artery stent system capable of being placed through the radial artery is formed by braiding a soft tube in the prior art by two strands of braided wires with different directions and different sizes, so that the 5F braided tube can realize the strength and the flexibility of the 6F soft tube, and can smoothly pass through the bending of the subclavian artery when being placed through the radial artery.

Description

Carotid artery stent system capable of being placed through radial artery

Technical Field

The invention relates to the field of medical appliances, in particular to a carotid artery stent system capable of being placed through radial artery.

Background

The carotid artery stent system is mainly suitable for carotid artery lesions, the system is used for treating blood circulation disorder caused by carotid artery stenosis or occlusion, a blood vessel is expanded by placing a stent in the carotid artery, so that blood circulation is restored, the stent is usually required to have good radial supporting force and flexibility so as to adapt to morphological changes of the artery and ensure normal flow of blood, the stent is mainly divided into a woven structure and a laser cutting structure at present, the woven structure is mainly used for inaccurately releasing due to large shortening rate, therefore, the laser cutting structure is mainly used clinically, the method for implanting the stent in the prior art is that arterial puncture is carried out through femoral artery, after puncture is successful, arterial sheath tube is placed, guide wires and guide tubes are placed along the arterial sheath tube, the vascular stent is delivered into a lesion vascular part of a human body by a delivery assembly under the guide of the guide wires, then the vascular stent is restored to be fixed on the inner wall of the lesion vascular part under the pushing of the push of the guide wire assembly, and finally, the operation is completed according to the conventional methods.

If the authorized bulletin number is CN112107402A, the authorized bulletin date is 12/22 of 2020, and the patent application is entitled "an improved carotid stent implantation device", which comprises a sheath and an expandable balloon outside the sheath; the protective umbrella is characterized in that a protective umbrella which can displace along an inner channel of the sheath tube and is in a contracted state is arranged in the sheath tube, and a guide screw which can be placed in the sheath tube and is in sliding connection with the protective umbrella is arranged along the axis of the protective umbrella; a blood filtering device which can be combined and connected with the rear end of the sheath tube is arranged at the first end of the sheath tube, the other end of the blood filtering device is connected with a venous sheath, and the device is still led into the sheath tube in a mode of puncturing the inguinal femoral artery so as to ensure the minimally invasive nature of the operation; meanwhile, the blood filtering device is additionally arranged, so that retrograde blood is effectively led to the vein after being filtered, and the bleeding amount in the operation is reduced.

The disadvantages including the above patent are that, because the femoral artery is the big artery of the human body, the patient is unable to move through the puncture side leg of femoral artery postoperative, need be the bed for at least three days, theoretically, it is faster to get the rehabilitation and operation more convenient after radial artery implantation operation, but the size of carotid artery support is great, generally minimum needs to cooperate the outer tube of 6F as the conveyer pipe, and the conveyer pipe of 6F is too thick, radial artery implantation needs to pass through subclavian artery, and the bending angle is above 90 degrees, the bending difficulty that the conveyer pipe of 6F accomplishes this angle is too big, and the radial artery is finer than the femoral artery, need finer conveying system, so its root cause is that the wall thickness that the conveyer pipe of 6F in the prior art leads to in order to compromise toughness and hardness is too big.

Disclosure of Invention

The present invention is directed to a carotid artery stent system that can be placed through the radial artery to address the above-described deficiencies in the prior art.

In order to achieve the above object, the present invention provides the following technical solutions:

The carotid artery stent system capable of being placed in through radial artery comprises a conveying component, a support, a guide wire and a pushing guide wire component, wherein the conveying component comprises an outer tube, the pushing guide wire component is used for placing the support into the carotid artery through the outer tube under the guidance of the guide wire, the outer tube is a composite braided tube, the composite braided tube comprises a first braided wire and a second braided wire, the winding directions of the first braided wire and the second braided wire are opposite, and the first braided wire and the second braided wire are configured to be different in bending stress.

In the carotid artery stent system capable of being placed through radial artery, the radial dimension of the first braided wire is different from the radial dimension of the second braided wire so as to realize the difference of bending stress.

In the carotid artery stent system capable of being placed through radial artery, the first braided wire is a plurality of braided wires, and the second braided wire is a single-stranded braided wire.

In the carotid artery stent system capable of being placed through radial artery, the second braided wire is a plurality of braided wires, and the second braided wire is a single-stranded braided wire.

In the carotid artery stent system capable of being placed through radial artery, the thread pitch of the first braided wire is different from the thread pitch of the second braided wire so as to realize the bending stress difference.

In the carotid artery stent system capable of being placed through radial artery, the first braided wire and the second braided wire are flat.

According to the carotid artery stent system capable of being placed through radial artery, the inside of the outer tube is divided into the guide cavity and the pushing cavity by the diaphragm, the side wall of the outer tube is provided with the guide wire outlet, and the guide wire enters from the guide wire inlet in the distal direction of the pushing guide wire assembly and extends out from the guide wire outlet through the guide cavity.

The carotid artery stent system capable of being placed through radial artery comprises a plurality of segments, each segment is annular, each segment annular comprises a peak structure and a trough structure, and the peak structures of two adjacent segments are staggered.

The carotid artery stent system capable of being placed through radial artery comprises a support rod, wherein the size of the support rod in the circumferential direction of the stent is smaller than 0.1mm, and the size of the support rod in the radial direction of the stent is larger than 0.1mm.

The carotid artery stent system capable of being placed through radial artery, wherein the pushing guide wire assembly comprises an inner tube, the inner tube is arranged in the outer tube, the guide wire enters from a guide wire inlet of a soft head at the far end of the inner tube and penetrates out from the near end of the inner tube, and the near end of the inner tube is positioned in the guide cavity.

In the carotid artery stent system capable of being placed through radial artery, the pushing guide wire assembly comprises a linear section and a cylindrical section which are connected, part of the inner tube is sleeved in the cylindrical section, and the other part of the inner tube is arranged in parallel with the linear section.

In the carotid artery stent system capable of being placed through radial artery, the cylindrical section is provided with the fixing ring, and the fixing ring is used for abutting against the stent when releasing the stent.

The carotid artery stent system capable of being placed through radial artery, wherein the conveying component comprises an operating piece, the operating piece comprises a front handle and a rear handle, the outer tube is connected with the front handle, and the rear handle is connected with the pushing guide wire component.

In the technical scheme, the carotid artery stent system capable of being placed through the radial artery provided by the invention is characterized in that a soft tube in the prior art is replaced by a braided tube, the soft tube is formed by braiding two strands of braided wires with different directions and different thicknesses, the first braided wire is spirally wound in the same direction, the second braided wire is spirally wound in the opposite direction, and the 5F braided tube can achieve the strength and the flexibility of the 6F soft tube, so that the soft tube can smoothly pass through subclavian artery bending when placed through the radial artery.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments described in the present application, and it is also possible for one of ordinary skill in the art to make reference to these

The figures obtain other figures.

Fig. 1 is a schematic structural diagram of a bracket according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a conveying assembly according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view of the distal end of an outer tube according to an embodiment of the present invention;

FIG. 4 is a cross-sectional view of the distal end of an outer tube provided by another embodiment of the invention;

FIG. 5 is a schematic view of an outer tube according to another embodiment of the present invention;

FIG. 6 is a schematic view of a membrane according to another embodiment of the invention;

FIG. 7 is a schematic view of an outer tube according to another embodiment of the present invention;

Fig. 8 is a schematic view of a stent braiding wire according to another embodiment of the present invention.

Reference numerals illustrate:

1. a bracket; 2. a connecting rod; 3. a support rod; 4. a transport assembly; 5. a linear segment; 6. a guide wire; 7. a guidewire outlet; 8. a guide lumen; 9. a pushing cavity; 10. an inner tube; 11. a cylindrical section; 12. a front handle; 13. a rear handle; 14. an outer tube; 15. a diaphragm; 19. a soft head; 22. selecting a direction sleeve; 23. a fixing ring; 24. a first braided wire; 25. a second braided wire; 26. and (3) a film.

Detailed Description

In order to make the technical scheme of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings.

In various embodiments of the present invention, "proximal" and "distal" are relative orientations, relative positions, directions of elements or actions relative to each other from the perspective of a physician using the medical device, although "proximal" and "distal" are not intended to be limiting, and "proximal" generally refers to the end of the medical device that is proximal to the physician during normal operation, and "distal" generally refers to the end that is distal to the physician that first enters the patient, in this implementation, the stent is annular in shape, as shown in fig. 8, a being in a circumferential direction, and b being in a radial direction.

Referring to fig. 1-8, the device comprises a conveying component 4, a bracket 1, a guide wire 6 and a pushing guide wire component, wherein the conveying component 4 comprises an outer tube 14, the pushing guide wire component is used for placing the bracket 1 into a carotid artery through the outer tube 14 under the guidance of the guide wire 6, the outer tube 14 is a composite braided tube, the composite braided tube comprises a first braided wire 24 and a second braided wire 25, the winding directions of the first braided wire 24 and the second braided wire 25 are opposite, and the first braided wire 24 and the second braided wire 25 are configured to be different in bending stress.

Specifically, the stent 1 is in a state of unblocking a coronary artery which is blocked or stenosed, the guide wire is used for providing a rail for a balloon, the stent 1, a catheter, and other instruments which subsequently enter a lesion vessel to the distal end of the vessel through the coronary artery stenosis or blocking part, the push wire assembly is mainly used for pushing the stent 1 to the lesion site, the stent 1, the push wire assembly and the guide wire 6 are all positioned in the outer tube 14, the guide wire 6 is penetrated in the outer tube 14 for guiding the outer tube 14 to enter the vessel of a human body, the push wire assembly is used for placing the stent 1 into the carotid artery through the outer tube 14, the delivery assembly 4 comprises an outer tube 14, more commonly, the outer tube 14 is adhered to a front handle 12 of an operating handle, preferably, the outer tube 14 is a composite braided tube, the composite braided tube comprises a first braided wire 24 and a second braided wire 25, the first braided wire 24 and the second braided wire 25 are preferably flat, the flat is smaller in size in the radial direction of the stent than in the circumferential direction, the winding directions of the first braided wire 24 and the second braided wire 25 are opposite, preferably, the first braided wire 24 is spirally wound in the same direction, the second braided wire 25 is spirally wound in the opposite direction, The radial dimensions of the first braided wire 24 are different from the radial dimensions of the second braided wire 25 to achieve the difference in bending stress, and the number of braided wires is the same as the radial dimensions (for example, the radial dimensions of two strands of first braided wires are larger than those of one strand of second braided wire), that is, there are two possibilities that the radial dimensions of the first braided wire 24 are larger than those of the second braided wire 25, that is, the number of strands 24 of the first braided wire is larger than that of the second braided wire 25, preferably, the first braided wire 24 is a plurality of strands of braided wires, the second braided wire 25 is a single strand of braided wire, and the second braided wire 25 is larger than that of the first braided wire 24, Preferably, the second braiding wire 25 is a multi-strand braiding wire, the first braiding wire 24 is a single-strand braiding wire, the pitch of the first braiding wire 24 is different from the pitch of the second braiding wire 25 to realize the difference of the bending stress, that is, two possibilities are that the pitch of the first braiding wire 24 is larger than the pitch of the second braiding wire 25, and the pitch of the second braiding wire 25 is larger than the pitch of the first braiding wire 24, so any combination of the above can ensure that the outer tube bends smoothly in a larger position such as aortic arch, preferably, the radial dimensions of the first braiding wire 24 and the second braiding wire 25 are the same, or the first braiding wire 24 and the second braiding wire 25 are both one strand, The first braiding wire 24 and the second braiding wire 25 have different screw pitches, so that the strength and the flexibility of the outer tube can be ensured, the existing radial delivery system in clinic is a unidirectional spiral coiled reed pipe for ensuring the flexibility, but the pipe can be used for a common catheter and a delivery sheath pipe for loading a bracket 1, the pipe is easy to bend, and the pushing property is also deficient to a certain extent, so that the composite braiding pipe structure of the invention ensures the flexibility of the outer tube at the far end side by the first braiding wire 24 in the same direction, and ensures the flexibility of the pipe without being influenced by the second braiding wire 25 in the opposite direction, and simultaneously ensures the pushing property and the supporting property.

According to the carotid artery stent system capable of being placed through the radial artery, a soft tube in the prior art is replaced by a braided tube, the carotid artery stent system is formed by braiding two strands of braided wires with different directions and different thicknesses, the first braided wire is spirally wound in the same direction, the second braided wire is spirally wound in the opposite direction, and therefore the 5F braided tube can achieve the strength and the flexibility of the 6F soft tube, and accordingly the carotid artery can smoothly pass through subclavian artery bending when placed through the radial artery.

In another embodiment provided by the invention, the outer tube 14 comprises a first section and a second section, wherein the first section is a section positioned at the proximal end side, the second section is a section positioned at the distal end side, the inner space of the outer tube 14 is divided into a guide cavity 8 and a pushing cavity 9 in the second section by a diaphragm 15, a guide wire outlet 7 communicated with the guide cavity 8 is arranged on the side wall of the outer tube 14, namely the guide cavity 8, the guide wire 6 is positioned in the guide cavity 8 during operation, as the guide wire 6 is already sent into a blood vessel in advance and the majority of the guide wire is positioned in the blood vessel during operation, the outer tube 14 is loaded with the bracket 1 and the pushing guide wire assembly, one end of the guide wire 6 positioned outside the body is accessed from the distal end inlet of the soft head 6, then the outer tube 14 is pushed, the guide wire 6 enters the guide cavity 8 of the outer tube 14 and extends out from the guide wire outlet 7, finally, the outer tube 14 is normally pushed until the operation is completed at the lesion position, the guide wire 6 can guide the outer tube 14 into the blood vessel after passing through the guide wire inlet in the conveying component 4, after the guide wire 6 enters the guide wire inlet, the guide wire 6 can extend out of the guide wire outlet through the guide cavity 8, at the moment, one end of the guide wire 6 is positioned in the blood vessel of a human body, the other end is positioned outside the outer tube 14 and parallel to the conveying component 4, so that the conveying of the vascular stent 1 is not influenced, the guide wire 6 can guide the outer tube 14 into the blood vessel after passing through the guide wire inlet in the conveying component 4, after the guide wire 6 enters the guide wire inlet, the guide wire 6 can extend out of the guide wire outlet through the guide cavity 8, at the moment, one end of the guide wire 6 is positioned in the blood vessel of the human body, the other end is positioned outside the outer tube 14 and parallel to the conveying component 4, so as not to interfere with the delivery of the vascular stent 1.

In a further embodiment of the present invention, in order to reduce the overall size of the outer tube 14, the septum 15 is limited to the proximal end of the second section, so that the distal end of the second section can be completely loaded with the stent 1, thereby reducing the overall size of the outer tube 14, but this presents a new problem in that the guide wire 6 must be accurately inserted into the guide lumen 8 again after entering the outer tube 14, and in order to solve this problem, it is preferable that the push wire assembly further comprises an inner tube 10, the stent 1 is sleeved on the inner tube 10, the inner tube 10 is provided with a central lumen, the proximal end of the inner tube 14 is preloaded into the guide lumen 8 when the stent 1 and the outer tube 14 are loaded in vitro, so that the guide wire 6 is directly inserted from the distal end of the central lumen of the inner tube 10, is directly positioned in the guide lumen 8 when it is penetrated from the proximal end of the central lumen, and even directly penetrates the guide wire outlet 7, so that no separate guiding of the outer tube 14 of the guide wire 6 is required.

In a further embodiment of the present invention, the distal end of the inner tube 10 is provided with a soft head 19, the soft head 19 is of a cylindrical structure with elasticity, and the distal end is of a truncated cone shape or a frustum shape, which has the function of limiting the distal end of the stent 1 to prevent axial movement, and the soft head 19 can extend out of the outer tube 14 to protect the inner wall of the blood vessel. In this embodiment, the central lumen extends through the soft head 19 to facilitate entry of the guide wire 6.

In a further embodiment of the present invention, the pushing guide wire assembly includes a linear section 5 and a cylindrical section 11 connected, the linear section 5 is a strip-shaped solid structure, the cylindrical section 11 is a cylindrical structure with a central through cavity, the linear section 5 and the cylindrical section 11 are directly connected, and the inner tube 10 passes through the central through cavity of the cylindrical section 11, to be precise, a part of the inner tube 10 is sleeved in the cylindrical section 11, and another part of the inner tube 10 is arranged in parallel with the linear section 5, in this embodiment, the cylindrical section 11 is sleeved with the inner tube 10 and directly abuts against the proximal end of the bracket 1, so that uniform circumferential pressure on the proximal end of the bracket 1 can be realized.

In a further embodiment of the present invention, the cylindrical section 11 of the push wire assembly is provided with a fixing ring 23, the fixing ring 23 includes a conical section and a cylindrical section, the cylindrical section is connected to the inner wall of the cylindrical section 11, the cylindrical section is further provided with a developing mark for assisting positioning, the radial dimension of the conical section is larger than the radial dimension of the cylindrical section 11, preferably, the fixing ring 23 is welded to the cylindrical section 11 of the push wire assembly, the top end of the conical Duan Yuan end abuts against the bracket 1, and the side wall of the conical section abuts against the cylindrical section 11, so that when the bracket 1 is released, pushing the bracket 1 by the end face of the fixing ring 23 rather than relying on the annular end face of the cylindrical section 11 is ensured, pushing is more reliable, preventing the bracket 1 from sliding, and the distal end of the inner tube 10 and the fixing ring 23 are provided with developing marks, which are not in favor of the prior art.

In another embodiment provided by the invention, the support 1 comprises a plurality of segments, preferably, the length of each segment is smaller than 3mm, the gap between two adjacent segments is smaller than 0.5mm, the support 1 comprises a support rod 3, the size of the support rod 3 in the circumferential direction of the support 1 is smaller than 0.1mm, the size of the support rod 3 in the radial direction of the support is larger than 0.1mm, the segments are connected through connecting rods 2, namely, the connecting rods 2 are arranged at intervals, preferably, the connecting rods 2 are in a bending structure, the connecting rods 2 in the bending structure can increase compliance and are suitable for tortuous vessels, and simultaneously, in order to minimize the contact surface between the support 1 and the vessels, each segment is in a ring shape, the ring shape of each segment comprises a crest structure and a trough structure, the peak structures of two adjacent segments are staggered, the offset distance between the peak structure of the next segment and the peak structure of the last segment is not more than the central axis of the peak structure of the last segment, the segments comprise a straight segment and a curve transition segment, wherein the straight segment is a horizontal segment, the curve transition segment is an inclined segment, that is, the slope of the curve transition segment can be changed, if the slope of the curve transition segment is larger, the radial opening of the support 1 is larger, so that the support 1 can provide larger radial opening force when the support 1 is opened, and meanwhile, the straight segment close to the peak structure is convenient for the support 1 to be loaded in a lying manner.

In still another embodiment of the present invention, the stent 1 may be further covered with a film, as shown in fig. 6, preferably, the film 26 is made of a polymer material, so as to prevent plaque or emboli from falling off from the meshes of the stent 1, the film 26 further includes an opening structure, the opening structure of the film 26 may be a diamond mesh opening, a continuous ring opening or a pair opening, and the stent 1 is further provided with a rivet developing ring, so as to increase the developability of the stent 1, and the stent 1 is straight, or tapered (reducing).

In yet another embodiment of the present invention, the delivery assembly 4 includes an operating member, the operating member includes a front handle 12 and a rear handle 13, the outer tube 14 is connected to the front handle 12, the rear handle 13 is connected to the push wire assembly, and the front handle 12 can drive the outer tube 14 to retract relative to the inner tube 10, so that the inner tube 10 extends out of the outer tube 14, thereby releasing the stent 1. The outer tube 14 distal end possesses the development ring, and the development ring of operator's accessible outer tube distal end and solid fixed ring department development ring, and support 1 is located in the middle of both, simultaneously to toper support 1, for distinguishing toper support 1 big footpath end and path end, the middle part of inner tube support 1 loading area can set up the development and load, developing device just can distinguish the transition zone at support 1 big footpath and path end when support 1 is compression state.

In yet another embodiment provided by the present invention, the distal end of the outer tube 14 is provided with a direction-selecting sleeve 22, preferably, the direction-selecting sleeve 22 is a truncated cone with a through hole, in this embodiment, the soft head 19 is arranged to be in a normal arc-shaped rather than a straight line configuration, when the soft head 19 is sleeved into the direction-selecting sleeve 22, the end of the soft head 19 is forced to be in a straight line configuration under the limit of the direction-selecting sleeve 22, in the implantation operation of the stent 1, a blood vessel at the shoulder blade of a human body has a bend of more than 90 degrees, the whole delivery system is easy to cause the injury of the blood vessel and the drop of thrombus through the position, in this embodiment, the outer tube 14 and the direction-selecting sleeve 22 can be pulled back at the position, so that the soft head 19 returns to a natural arc shape and is adjusted to adapt to the large arc of the blood vessel to facilitate the passage, and the inner tube 10 can be pulled back through the region so as to restore the straight line of the soft head 19. The arrangement of the direction-selecting sleeve 22 has other advantages, namely, firstly, the direction-selecting sleeve 22 can reduce the damage of the distal end to the vessel wall when the outer tube 14 advances in the vessel, secondly, the distal end of the direction-selecting sleeve 22 can be arranged to be in an elastic telescopic structure, namely, the direction-selecting sleeve 22 can be elastically attached to the sleeve joint 19 and the distal end of the support 1, and when the support 1 extends out of the outer tube 14, the direction-selecting sleeve 22 and the fixing ring 23 respectively realize the limit of the two ends of the support 1, so that the stable and accurate control in the release process of the support 1 is realized.

In yet another embodiment provided by the present invention, the inner tube 10, push guidewire assembly, septum 15, outer tube 14 and soft head 19 are sized as follows: in the in-vitro assembly state, when the sleeve 22 is selected to be sleeved with a majority of the soft head 19 so that the soft head is in a straight line shape, the proximal end of the inner tube 10 can extend out of the guide wire outlet 7, and at the moment, the distal end of the diaphragm 15 can be abutted against the proximal end of the cylindrical section of the pushing guide wire assembly, so that when the inner tube 10 extends out of the guide wire outlet 7 for a certain length by naked eyes, the inner tube 10 can be judged to be assembled because the diaphragm 15 is abutted against the cylindrical section and cannot be pulled continuously. Alternatively, a mark may be provided on the inner tube 10, and the mark may be seen at the guide wire outlet 7 to determine that the assembly is in place.

Further, the inner tube 10 is sized to: when the flexible head 19 is bent after the selective sleeve 22 moves, the proximal end of the inner tube 10 still extends out of the guide wire outlet 7, which has the advantage that, during operation, when the inner tube 10 extends out of the guide wire outlet 7 for a certain length, the bending direction of the flexible head 19 may not be consistent with the bending direction of the blood vessel after the selective sleeve 22 moves, in the above embodiment, the operator needs to rotate the guide wire 6 to change the direction of the flexible head 19 so as to enter the bent blood vessel, but in the prior art, the distal end of the guide wire 6 is not necessarily precisely 30 degrees when the guide wire 6 rotates at the proximal end, that is, the rotation angle of the flexible head 19 cannot be precisely controlled, but in the embodiment, when the inner tube 10 extends out of the guide wire outlet 7 for a certain length, the inner tube 10 extends out of the guide wire outlet 7, the outer tube and the inner tube 10 can synchronously rotate, so that the operator rotates the outer tube can drive the flexible head 19 to rotate so as to enter the bent blood vessel, the precise rotation angle adjustment is realized, and the two ends of the guide wire 6 are directly adapted to the flexible head 19, at the moment, and the two ends of the flexible head 19 can be completely rotated, so that the two ends of the inner tube 10 and the flexible head 19 can be completely recovered, and the two ends of the flexible head 19 can be directly stretched out of the inner tube 19.

In a preferred embodiment, the soft head 19 may be divided into three sections from distal to proximal: when the first straight line section, the arc section and the second straight line section are not influenced by external force, namely under the natural state, only the arc section is in a natural arc shape, the function of the arrangement is that the first straight line section is positioned at the outer side of the first straight line section which is in a straight line shape naturally when the first straight line section is assembled, and when a blood vessel is bent, the first straight line section is separated from the arc section by the axial relative movement of the first straight line section and the arc section which is only sleeved on the second straight line section when the blood vessel is bent, so that the bending of the first straight line section and the arc section relative to the second straight line section can be realized.

While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that modifications may be made to the described embodiments in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive of the scope of the invention, which is defined by the appended claims.

Claims (9)

1. A carotid artery stent system capable of being placed through radial artery, comprising a conveying component, a stent, a guide wire and a pushing guide wire component, wherein the conveying component comprises an outer tube, the pushing guide wire component is used for placing the stent into the carotid artery through the outer tube under the guidance of the guide wire, the carotid artery stent system is characterized in that the outer tube is a composite braided tube, the composite braided tube comprises a first braided wire and a second braided wire, the winding directions of the first braided wire and the second braided wire are opposite, the first braided wire and the second braided wire are configured to have different bending stresses, the inside of the outer tube is divided into a guide cavity and a pushing cavity by a diaphragm, a guide wire outlet is arranged on the side wall of the outer tube, the guide wire enters from a guide wire inlet in the distal direction of the pushing guide wire component and extends from the guide wire outlet through the guide cavity, the stent comprises a strut, the size of the strut in the circumferential direction of the stent is smaller than 0.1mm, the size of the strut in the radial direction of the stent is larger than 0.1mm, the push wire guide assembly comprises an inner tube, the inner tube is arranged in the outer tube, the distal end of the inner tube is provided with a soft head, a guide wire enters from a wire inlet of the soft head at the distal end of the inner tube and passes out from the proximal end of the inner tube, the proximal end of the inner tube is positioned in a guide cavity, the push wire guide assembly comprises a linear section and a cylindrical section which are connected, a part of the inner tube is sleeved in the cylindrical section, the other part of the inner tube is arranged in parallel with the linear section, the outer tube comprises a first section and a second section, the first section is positioned at the proximal end side, the second section is positioned at the distal end side, after the guide wire enters the guide wire inlet during operation, the guide wire can stretch out from the guide wire outlet through the guide cavity, at the moment, one end of the guide wire is positioned in a human body blood vessel, the other end of the guide wire is positioned outside the outer tube and is parallel to the conveying component, the diaphragm is limited to the proximal end of the second section, the distal end of the second section can be completely loaded with the support, namely the guide wire must accurately enter the guide cavity again after entering the outer tube, the support is sleeved on the inner tube, the inner tube is provided with a central cavity, the proximal end of the inner tube is preloaded into the guide cavity when the support and the outer tube are loaded in vitro, the guide wire directly enters from the distal end of the central cavity of the inner tube, the guide wire directly penetrates out from the proximal end of the central cavity and is directly positioned in the guide cavity, the distal end of the outer tube is provided with a selective sleeve, in an in-vitro assembly state, the selective sleeve is sleeved with a large part of a soft head so that the proximal end of the inner tube can stretch out from the guide wire outlet, and at the moment, the distal end of the diaphragm can be abutted on the proximal end of the tubular section of the push wire component, when the inner tube stretches out from the guide wire outlet, the inner tube can not be judged to be continuously pulled to the assembly position due to the fact that the diaphragm can not be continuously pulled to the abutting.

2. The radial implantable carotid artery stent system of claim 1, wherein a radial dimension of the first braided wire is different from a radial dimension of the second braided wire to achieve the difference in bending stress.

3. The radial implantable carotid artery stent system of claim 2, wherein the first braided wire is a multi-strand braided wire and the second braided wire is a single-strand braided wire.

4. The radial implantable carotid artery stent system of claim 2, wherein the second braided wire is a multi-strand braided wire and the first braided wire is a single-strand braided wire.

5. The radial implantable carotid artery stent system of claim 1, wherein a pitch of the first braided wire is different from a pitch of the second braided wire to achieve the different bending stress.

6. The radial implantable carotid artery stent system of claim 1, wherein the first braided wire and the second braided wire are flattened.

7. The radial implantable carotid artery stent system of claim 1, wherein the stent comprises a plurality of segments, each of the segments being annular, each of the annular segments comprising a peak structure and a trough structure, the peak structures of adjacent two of the segments being staggered.

8. A radial implantable carotid artery stent system according to claim 1, wherein a retaining ring is provided on the tubular section for bearing against the stent when the stent is released.

9. The radial implantable carotid artery stent system of claim 1, wherein the delivery assembly comprises an operator comprising a front handle and a rear handle, the outer tube coupled to the front handle, the rear handle coupled to the push guidewire assembly.