Disclosure of Invention
In order to solve the technical problems, the invention provides the punctiform stent system, the punctiform stent and the punctiform stent conveying system which can effectively reduce the turbulence of blood and have high release accuracy of the punctiform stent.
In order to achieve the above object, the present invention provides the following solutions:
the present invention provides a punctiform stent system comprising: the elastic frame body is of an annular structure, a plurality of first peak structures are arranged at the first end Zhou Xiangji and the second end of the elastic frame body in the circumferential direction, and each first peak structure is tilted outwards along the radial direction of the elastic frame body; the conveying sleeve is characterized in that a limiting piece is arranged on the elastic frame body, a limiting groove is formed in the outer side wall of the conveying sleeve, the limiting piece is arranged in the limiting groove, the elastic frame body is axially positioned, and the limiting piece can be separated from the limiting groove along the radial direction of the conveying sleeve.
Preferably, the first end of the elastic frame body is opposite to the first end of the conveying sleeve, the first end of the elastic frame body is connected with the limiting piece through a connecting piece, the width of the limiting piece is larger than that of the connecting piece, a communicating groove used for accommodating the connecting piece is further formed in the outer side wall of the conveying sleeve, the first end of the communicating groove is communicated with the limiting groove, the second end of the communicating groove extends to the first end of the conveying sleeve, the width of the communicating groove is smaller than that of the limiting piece, and the connecting piece is arranged in the communicating groove.
Preferably, the number of the limiting pieces is multiple, and the limiting pieces are uniformly arranged along the circumferential direction of the elastic frame body.
Preferably, the elastic frame body comprises a connecting assembly and two annular frames with coincident axes, each annular frame circumferentially takes the shape of a wave, a plurality of first peak structures are formed at the first end circumferentially of each annular frame, a plurality of second peak structures are formed at the second end circumferentially of each annular frame, the second ends of the two annular frames are oppositely arranged, one of the second peak structures of the two annular frames corresponds to the second peak structures of the other annular frame one by one, the connecting assembly is arranged between the two annular frames, the connecting assembly comprises a plurality of connecting rings, and each connecting ring is arranged between the corresponding two second peak structures and is connected with the two second peak structures arranged at two sides of the connecting ring.
Preferably, the punctiform stent system further comprises a developing structure disposed inside the connecting ring.
Preferably, the raising angle of each first vertex structure is 0-80 degrees.
Preferably, a liquid injection groove is arranged on the outer side wall of the conveying sleeve along the length direction of the conveying sleeve.
Preferably, the conveying sleeve is provided with a glue injection hole communicated with the interior of the conveying sleeve.
Preferably, the whole outer diameter of the conveying sleeve, part of the outer diameter of the conveying sleeve is equal to the inner diameter of an outer tube of the conveying system, and the rest outer diameter is smaller than the inner diameter of the outer tube.
Preferably, the elastic frame body is made of shape memory alloy.
The invention also provides a punctiform bracket, which comprises an elastic bracket body, wherein the elastic bracket body is of an annular structure, a plurality of first peak structures are arranged at the second end of the first end Zhou Xiangji of the elastic bracket body in the circumferential direction, and each first peak structure is tilted outwards along the radial direction of the elastic bracket body; each first vertex structure is a passivation tip, the sizes of a plurality of passivation tips are not completely consistent, and the elastic frame body is provided with a limiting piece extending along the direction parallel to the axis of the elastic frame body.
The invention also provides a punctiform stent conveying system, which comprises a Tip head, an inner pipe, a plurality of conveying sleeves and an outer pipe; the far end of the inner tube is connected with a Tip head, and a plurality of conveying sleeves are arranged on the peripheral surface of the far end section of the inner tube at intervals; a liquid injection groove which axially penetrates through the conveying sleeve is formed in the outer side wall of the conveying sleeve, and a limiting groove is formed in the conveying sleeve; the wall of the far-end section of the outer tube is provided with a plurality of through holes, the near end of the outer tube is provided with a liquid injection port for injecting contrast agent, the inner tube and the outer tube are movably sleeved, and a fluid channel is axially arranged between the outer wall surface of the inner tube and the inner wall surface of the outer tube; the liquid injection port, the fluid channel, the liquid injection groove and the through hole are sequentially communicated.
Compared with the prior art, the invention has the following technical effects:
1. the dot stent system provided by the invention comprises: the elastic frame body is of an annular structure, a plurality of first peak structures are arranged at the first end Zhou Xiangji and the second end of the elastic frame body in the circumferential direction, and the first peak structures tilt outwards in the radial direction of the elastic frame body. In the specific use process, the first vertex structures of all perk can be inserted into the plaque inside, so that the end part of the punctiform stent is hidden in the inner wall of the blood vessel. Compared with the offset of the end part of the punctiform stent to the middle part of the blood vessel, the blood turbulence is effectively lightened by hiding the end part of the punctiform stent. In addition, the first vertex structure is inserted into the plaque, the stability of the point-shaped support is better, and the point-shaped support is not easy to shift in the use process.
2. The punctiform support system provided by the invention further comprises a conveying sleeve, wherein the elastic support body is provided with a limiting piece, the outer side wall of the conveying sleeve is provided with a limiting groove, the limiting piece is arranged in the limiting groove so as to axially position the elastic support body, and the limiting piece can be separated from the limiting groove along the radial direction of the conveying sleeve.
The conveying system comprises an inner pipe and an outer pipe, the outer pipe is sleeved outside the inner pipe, when the conveying system is in a conveying state, the elastic frame body and the conveying sleeve are arranged between the inner pipe and the outer pipe and are sleeved on the inner pipe, the elastic frame body is compressed, and the conveying sleeve is fixedly connected with the inner pipe. When the guide wire guides the inner tube to move, the elastic frame body, the conveying sleeve and the outer tube move synchronously along with the inner tube when the inner tube moves to the pathological change position, the outer tube is retracted, and after the elastic frame body and the outer tube are completely staggered, the elastic frame body automatically expands due to the fact that the constraint of the outer tube is lost, and positioning is achieved. After the positioning is finished, the inner tube and the conveying sleeve are guided by the guide wire to withdraw from the inside of the blood vessel, and the whole conveying process can be finished. Through set up the locating part at the first end of elastic support body and set up on the delivery sleeve with locating part matched with spacing recess, after removing the outer tube, spacing recess has restricted the locating part along the axis direction motion of blood vessel for the locating part can only radially expand. Therefore, the situation that the punctiform stent moves along the axis direction of the blood vessel in the release process is effectively avoided, and the release accuracy of the punctiform stent is improved.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Example 1
Referring to fig. 1 to 12, the dot stent system according to the present embodiment includes: the elastic frame body 1 is of an annular structure, a plurality of first peak structures 101 are arranged at the second end circumference of the first end Zhou Xiangji of the elastic frame body 1, and each first peak structure 101 is tilted outwards along the radial direction of the elastic frame body 1; the conveying sleeve 2 is provided with a limiting piece 4 on the elastic frame body 1, the outer side wall of the conveying sleeve 2 is provided with a limiting groove 201, the limiting piece 4 is arranged in the limiting groove 201 to axially position the elastic frame body 1, and the limiting piece 4 can be separated from the limiting groove 201 along the radial direction of the conveying sleeve 2.
Compared with the existing punctiform stent, the elastic stent body 1 provided by the embodiment can effectively reduce the turbulence of blood. In addition, in the concrete use, the conveying sleeve 2 is fixed on a conveying system, and the limiting piece 4 is arranged on the elastic frame body 1, and the limiting groove 201 matched with the limiting piece 4 is arranged on the conveying sleeve 2, so that when the elastic frame body 1 is conveyed in place, the limiting groove 201 can limit the limiting piece 4 to move along the axis direction of a blood vessel, and the elastic frame body 1 can only expand along the radial in-situ direction of the blood vessel, so that the release accuracy of the elastic frame body 1 is effectively provided.
As shown in fig. 2, the conventional conveying system for conveying a punctiform stent comprises an inner tube 5 and an outer tube 6, wherein the outer tube 6 is sleeved outside the inner tube 5, when the conveying system is in a conveying state, the elastic frame body 1 and the conveying sleeve 2 are arranged between the inner tube 5 and the outer tube 6 and are sleeved on the inner tube 5, the elastic frame body 1 is compressed, the conveying sleeve 2 is fixedly connected with the inner tube 5, a guide wire guides the inner tube 5 to move, the inner tube 5 moves, the elastic frame body 1, the conveying sleeve 2 and the outer tube 6 synchronously move along with the inner tube 5 when the inner tube 5 moves, when the outer tube 6 is retracted, and when the elastic frame body 1 and the outer tube 6 are completely staggered, the elastic frame body 1 automatically expands due to the loss of the constraint of the outer tube 6, so as to realize positioning. After the positioning is finished, the inner tube 5 and the delivery sleeve 2 are guided by the guide wire to withdraw from the inside of the blood vessel, and the whole delivery process can be finished. In addition, in a specific use process, a plurality of the dot-shaped stent systems provided in this embodiment are generally provided along the axial direction of the inner tube 5.
In some embodiments, the first end of the elastic frame body 1 is opposite to the first end of the conveying sleeve 2, the first end of the elastic frame body 1 is connected with the limiting piece 4 through the connecting piece 3, the width of the limiting piece 4 is larger than that of the connecting piece 3, the outer side wall of the conveying sleeve 2 is further provided with a communicating groove 202 for accommodating the connecting piece 3, the first end of the communicating groove 202 is communicated with the limiting groove 201, the second end of the communicating groove 202 extends to the first end of the conveying sleeve 2, the width of the communicating groove 202 is smaller than that of the limiting piece 4, and the connecting piece 3 is arranged in the communicating groove 202.
In some embodiments, as shown in fig. 8 to 10, the limiting integral part formed by the connecting piece 3 and the limiting piece 4 is extended along the axial direction, and has a limited length value L (axial constant diameter section). It can be appreciated that the limiting integral piece is arranged parallel to the axial direction of the elastic frame body 1, so as to inhibit the stress abrupt change when the low limiting piece 4 is separated from the limiting groove 201 along the radial direction of the conveying sleeve 2; when the elastic frame body 1 is released, the limiting integral piece is connected with the stay bar unit 105 (slender) on the elastic frame body 1 to form a strip-like long rod, when the first end of the annular frame 102 connected with the limiting piece 4 is circumferentially separated from the constraint of the outer tube 6, the limiting piece 4 is in the constraint state of the outer tube 6, so that the unbound part (the connecting piece 3-stay bar unit 105) of the strip-like long rod (the limiting piece 4-connecting piece 3-stay bar unit 105) is subjected to bending deformation, and when the limiting piece 4 is radially separated from the limiting groove 201, jump/oscillation occurs due to the release of constraint, and the jump/oscillation remarkably influences the release accuracy of the elastic frame body 1 and deviates from the expected position.
In some embodiments, the stay units 105 directly connected to the connecting member 3 or the stopper 4 are arranged such that the distance between each point in the axial direction and the axis of the elastic frame body 1 is a constant value (axial constant diameter).
In some embodiments, in particular, the limiting member 4 is a limiting block and the connecting member 3 is a connecting block. Further, the shape of the limit groove 201 matches the shape of the limit piece 4, and the shape of the communication groove 202 matches the shape of the connecting piece 3.
In some embodiments, the stop 4 is preferably one of a sheet or a sphere.
In some embodiments, in order to further improve the release accuracy, the number of the stoppers 4 is plural, and the plural stoppers 4 are uniformly arranged along the circumferential direction of the elastic frame body 1. Specifically, in this embodiment, the number of the limiting member 4, the connecting member 3, the limiting groove 201, and the communicating groove 202 is two. It should be noted that, the limiting members 4 are in one-to-one correspondence with the connecting members 3, the connecting members 3 are in one-to-one correspondence with the communicating grooves 202, and the limiting members 4 are in one-to-one correspondence with the limiting grooves 201.
In some embodiments, as shown in fig. 3, the elastic frame body 1 includes a connection assembly and two annular frames 102 with coincident axes, each annular frame 102 is in a wave shape in the circumferential direction, a first end of each annular frame 102 is formed with a plurality of first vertex structures 101 in the circumferential direction, a second end of each annular frame 102 is formed with a plurality of second vertex structures 103 in the circumferential direction, the second ends of the two annular frames 102 are oppositely arranged, the second vertex structures 103 of one annular frame 102 of the two annular frames 102 are in one-to-one correspondence with the second vertex structures 103 of the other annular frame 102, the connection assembly is arranged between the two annular frames 102, the connection assembly includes a plurality of connection rings 104, and each connection ring 104 is arranged between the corresponding two second vertex structures 103 and is connected with the two second vertex structures 103 arranged at two sides thereof. It should be noted that, the number of the first vertex structures 101 and the number of the second vertex structures 103 are equal, the number of the connection rings 104 may be equal to the number of the first vertex structures 101 and the second vertex structures 103, or may be smaller than the number of the first vertex structures 101 and the second vertex structures 103, as long as two ring frames 102 can be connected together, the specific number of the connection rings 104 depends on the actual situation, in this embodiment, the number of the connection rings 104 is one half of the number of the first vertex structures 101, and the plurality of connection rings 104 are uniformly arranged along the circumferential direction of the inner pipe 5 of the conveying system.
Further, two connectors 3 are connected to the two first vertex structures 101, respectively.
In some embodiments, as shown in fig. 8-12, the first apex structures are all tilted radially outward of the resilient frame body; each first vertex structure is a passivation tip, and the sizes of a plurality of passivation tips are not completely consistent. It can be appreciated that the first vertex structure 101 with different passivation tips can reduce the damage of the circumferential edge of the first end of the annular frame 102 to the inner membrane of the blood vessel wall on the premise that the elastic frame body 1 is anchored with the blood vessel wall after being released in the cavity of the target blood vessel segment, so as to inhibit the restenosis problem of the blood vessel walls at the two ends of the elastic frame body 1; when the elastic frame body 1 is subjected to the radial and axial pulse action of blood flow in the blood vessel cavity, the passivated tip can prevent the occurrence of penetration of the blood vessel wall due to sharp points.
Further, the two passivation tips are respectively a first passivation tip 106 and a second passivation tip 107, and the radius of the circumference of the first passivation tip 106 is different from the radius of the circumference of the second passivation tip 107. It can be appreciated that the first passivation tip 106 and the second passivation tip 107 are respectively arranged on circumferences with different radiuses, so that the elastic frame body 1 not only maintains good anchoring effect with the vessel wall, but also reduces the stimulation of the circumferential edge of the first end of the elastic frame body 1 to the inner membrane of the vessel wall under the environment of radial and axial pulse action of blood flow in the vessel cavity; the arrangement of different circumferential radii creates radial damping to inhibit the occurrence of blood turbulence.
Further, the circumference of the first blunt tip 106 is not coplanar with the circumference of the second blunt tip 107. It will be appreciated that the circumferentially arranged first and second blunt tips 106, 107 are arranged in an axially staggered distribution to prevent the two circumferential edges of the elastic frame body 1 from concentrating too much on the vessel wall.
Further, the radius of the arc of the first blunt tip 106 is smaller than the radius of the second blunt tip 107.
Further, the first passivation tip 106 and the second passivation tip 107 are spherical or elliptic paraboloids or arc-shaped surfaces.
In some embodiments, the punctiform stent system further comprises a development structure disposed inside the connecting ring 104, the development structure being connected to the connecting ring 104. In this embodiment, the developing structure is made of developing material and embedded in the connecting ring 104, so as to connect the developing structure and the connecting ring 104.
In some embodiments, as shown in fig. 4, the lift angle of each first vertex structure 101 is 0-80 degrees. Correspondingly, the raising angle of each second vertex structure 103 is also 0-80 degrees. The specific tilting angle is determined according to the actual situation, so long as the first vertex structure 101 and the second vertex structure 103 can be inserted into the inner wall of the blood vessel, and the tilting angle of the second top end is preferably consistent with the tilting angle of the first vertex structure 101.
In some embodiments, as shown in fig. 10, the annular shelf 102 of the elastic shelf body 1 includes a shelf constant diameter section 108 and a shelf variable diameter section 109 in the axial direction; the strut units 105 connected between the first and second apex structures 101 and 103 are divided into stent constant diameter segments 108 and stent variable diameter segments 109; one end of the variable-diameter section stay bar unit 105, which is tilted outwards along the radial direction of the elastic frame body 1, is connected with the first vertex structure 101, and the other end is connected with the constant-diameter section stay bar unit 105; the free ends of the constant diameter section strut elements 105 are connected to the second apex structure 103. The length ratio of the bracket constant diameter section 108 to the bracket variable diameter section 109 is 0.1 to 3. It can be understood that the annular frame 102 is subjected to the distribution treatment of the equal-diameter section and the variable-diameter section in the axial direction, which is beneficial to reducing the turbulence of blood, guaranteeing the anchoring performance of the elastic frame body 1 in the blood vessel cavity and preventing the elastic frame body 1 from being displaced away from the original target blood vessel section due to the blood flow pulse effect after implantation; the proper length ratio of the constant diameter section and the variable diameter section can enable the radial stress of the vascular wall at the edges of the two ends of the elastic frame body 1 to be in an expected range, and reduce the occurrence of restenosis of the target blood vessel.
Before the point-like stent is delivered to the blood vessel of the human body by using the delivery system, the gas inside the delivery system needs to be exhausted in advance, normal saline is injected into the delivery system in a common exhaust mode, the gas is driven out from the interior of the delivery system by using the normal saline, and in order to conveniently inject the normal saline between the inner tube 5 and the outer tube 6 of the delivery system, as shown in fig. 5, a liquid injection groove 203 is arranged on the outer side wall of the delivery sleeve 2 along the length direction of the delivery sleeve 2. In addition, through setting up annotating the cistern 203 on the conveying cover 2, the area of contact of conveying cover 2 and conveying system outer tube 6 reduces, and the frictional force between conveying cover 2 and the conveying system outer tube 6 reduces for conveying system outer tube 6 withdraws more conveniently.
In some embodiments, the number of the liquid injection grooves 203 is two, and the two liquid injection grooves 203 are symmetrically disposed on two opposite sides of the conveying sleeve 2. The number of the liquid injection grooves 203 is not limited to two, and the liquid injection grooves 203 are not limited to two, but are symmetrically disposed on two opposite sides of the conveying sleeve 2, and the number and the specific arrangement of the liquid injection grooves 203 are merely illustrative and may be determined according to actual needs.
In some embodiments, the delivery sheath 2 is provided with glue injection holes that communicate with the interior of the delivery sheath 2. In the concrete use, after the conveying sleeve 2 is sleeved on the inner pipe 5 of the conveying system, glue is injected between the conveying sleeve 2 and the inner pipe 5 through the glue injection holes, and the conveying sleeve 2 is adhered and fixed on the inner pipe 5 through the glue.
In some embodiments, the entire outer diameter of the delivery sheath 2, with a portion of the outer diameter equal to the inner diameter of the outer tube 6 of the delivery system, and the remaining outer diameter (the outer diameter of the entire outer diameter excluding the portion of the remaining outer diameter equal to the inner diameter of the outer tube 6) is less than the inner diameter of the outer tube 6. By making the outer diameter of the portion of the delivery sheath 2 equal to the inner diameter of the outer tube 6 of the delivery system, the contact area of the delivery sheath 2 with the delivery system is small and the friction between the delivery sheath 2 and the outer tube 6 of the delivery system is small. As shown in fig. 5, in this embodiment, specifically, the outer side wall of the conveying sleeve 2 includes an equal-diameter section 205 and a variable-diameter section 204, the variable-diameter section 204 is tapered, the large head end of the variable-diameter section 204 is connected with one end of the equal-diameter section 205, and the diameter of the large head end of the variable-diameter end and the diameter of the equal-diameter section 205 are equal to the inner diameter of the outer tube 6.
In some embodiments, the resilient frame body 1 is made of a shape memory alloy. It should be noted that the elastic frame body 1 is not limited to being made of a shape memory alloy, but is exemplified herein, and may be made of other materials having elasticity and capable of self-expanding.
Example two
The embodiment provides a punctiform stent, as shown in fig. 8-12, the punctiform stent comprises an elastic stent body 1, the elastic stent body 1 is in an annular structure, a plurality of first peak structures 101 are arranged at the second end circumference of a first end Zhou Xiangji of the elastic stent body 1, and each first peak structure 101 is tilted outwards along the radial direction of the elastic stent body 1; each first vertex structure 101 is a passivation tip, the sizes of the passivation tips are not completely consistent, and the elastic frame body 1 is provided with a limiting piece 4 extending along the direction parallel to the axis of the elastic frame body 1. It can be appreciated that the first vertex structure 101 with different passivation tips can reduce the damage of the circumferential edge of the first end of the annular frame 102 to the inner membrane of the blood vessel wall on the premise that the elastic frame body 1 is anchored with the blood vessel wall after being released in the cavity of the target blood vessel segment, so as to inhibit the restenosis problem of the blood vessel walls at the two ends of the elastic frame body 1; when the elastic frame body 1 is subjected to the radial and axial pulse action of blood flow in the blood vessel cavity, the passivated tip can prevent the occurrence of penetration of the blood vessel wall due to sharp points.
Further, the two passivation tips are respectively a first passivation tip 106 and a second passivation tip 107, and the radius of the circumference of the first passivation tip 106 is different from the radius of the circumference of the second passivation tip 107. It can be appreciated that the first passivation tip 106 and the second passivation tip 107 are respectively arranged on circumferences with different radiuses, so that the elastic frame body 1 not only maintains good anchoring effect with the vessel wall, but also reduces the stimulation of the circumferential edge of the first end of the elastic frame body 1 to the inner membrane of the vessel wall under the environment of radial and axial pulse action of blood flow in the vessel cavity; the arrangement of different circumferential radii creates radial damping to inhibit the occurrence of blood turbulence.
Further, the circumference of the first blunt tip 106 is not coplanar with the circumference of the second blunt tip 107. It will be appreciated that the circumferentially arranged first and second blunt tips 106, 107 are arranged in an axially staggered distribution to prevent the two circumferential edges of the elastic frame body 1 from concentrating too much on the vessel wall.
Further, the radius of the arc of the first blunt tip 106 is smaller than the radius of the second blunt tip 107.
Further, the first passivation tip 106 and the second passivation tip 107 are spherical or elliptic paraboloids or arc-shaped surfaces.
Example III
The embodiment provides a punctiform stent conveying system, which is matched with the embodiment for use, as shown in fig. 13-20, and comprises a Tip head 501, an inner pipe 5, a plurality of conveying sleeves 2, an outer pipe 6 and a plurality of conveying sleeves; the distal end of the inner tube 5 is connected with a Tip head 501, and a plurality of conveying sleeves 2 are arranged on the peripheral surface of the distal end section of the inner tube 5 at intervals; the outer side wall of the conveying sleeve 2 is provided with a liquid injection groove 203 which axially penetrates through the conveying sleeve, and the conveying sleeve 2 is provided with a limit groove 201; the wall of the far-end section of the outer tube is provided with a plurality of through-channels 602, the near end of the outer tube 6 is provided with a liquid injection port for injecting contrast agent, the inner tube 5 and the outer tube 6 are movably sleeved, and a fluid channel 9 is axially arranged between the outer wall surface of the inner tube 5 and the inner wall surface of the outer tube 6; the liquid inlet, the fluid passage 9, the liquid inlet tank 203 and the through-hole 602 are communicated in this order.
The delivery system provided in this embodiment is designed to deliver the punctiform stent while also having the capability of delivering a contrast agent, so as to facilitate a doctor to precisely understand the deployment condition of the punctiform stent in the vascular lumen of the patient without interrupting the stent release operation.
Specifically, in the conveying state, a plurality of elastic frame bodies 1 are coaxially pressed and held on the outer wall surface of the distal end section 51 of the inner tube at intervals by the conveying sleeve 2, and are sleeved and accommodated in the tube cavity by the outer tube 6; pushing the distal end section of the tube assembly loaded with a plurality of elastic frames 1 to the target vessel section through a channel established by the minimally invasive surgery; when the single elastic frame body 1 is deployed, the inner tube 5 is fixed, after the position of the inner tube 5 relative to the target vessel section is unchanged, the outer tube 6 is retracted until the radial constraint of the outer tube 6 on the single elastic frame body 1 is released; when a doctor or an operator needs to accurately observe whether the deployment of the current elastic frame body 1 is as expected through perspective and developing means, contrast agent is injected through a pipeline branch interface of the pipe fitting 601, and the contrast agent enters the target blood vessel cavity through the fluid channel 9, the through hole 602 and the liquid injection groove 203 to enhance the development of the released posture of the current elastic frame body 1.
Further, a tube 601 is disposed at the liquid injection port, and contrast medium is injected into the liquid injection port through the tube 601.
Further, as shown in fig. 16, among the plurality of through-channels 602 of the distal end section wall of the outer tube 6, there are inclined through-channels 603 which are partially at an acute angle or an obtuse angle to the distal direction. It will be appreciated that the provision of the inclined through-channels 603 is to remedy the disadvantage of the vertical through-channels being insufficiently provided with contrast agent in the region of the inclined side; when contrast agent is deployed, the tube assembly is often prevented from being positioned relative to the target vessel segment, so that the vertical through-channel and the liquid injection groove 203 have an included angle blind zone, which makes rapid injection of the deployed contrast agent impossible.
Further, the flow rate of the through-hole 602 or the liquid injection groove 203 is adjusted by adjusting the rotation angle of the outer tube 6 relative to the inner tube 5.
Further, as shown in fig. 17 to 18, the outer wall surface of the inner tube 5 is provided with a diversion trench 10 recessed toward the axial center; to increase the cross-sectional fluid delivery of the fluid channel 9 and to shorten the deployment time of the contrast agent.
Further, the inner wall surface of the outer tube 6 is provided with a diversion trench 10 recessed toward the outer wall surface; to increase the cross-sectional fluid delivery of the fluid channel 9 and to shorten the deployment time of the contrast agent.
Further, as shown in fig. 19 to 20, the outer tube 6 is provided to have a second tube section R2 having an inner diameter larger than the first tube section R1, and the outer diameters of the first tube section and the second tube section are equal; to increase the cross-sectional fluid delivery of the fluid channel 9 and to shorten the deployment time of the contrast agent.
In this specification, the punctiform stent system in the first embodiment includes the punctiform stent in the second embodiment and the conveying jacket in the punctiform stent conveying system in the third embodiment, and therefore, the punctiform stent in the second embodiment and the punctiform stent in the punctiform stent system in the first embodiment should be identical, belong to the same structure, and the conveying jacket in the third embodiment and the conveying jacket in the punctiform stent system in the first embodiment should be identical, belong to the same structure.
In the present specification, the term "punctate stent" refers to a short peripheral vascular stent implant having an overall axial length of not more than 2cm and a diameter of not more than 1.5 cm.
The principles and embodiments of the present invention have been described in this specification with reference to specific examples, the description of which is only for the purpose of aiding in understanding the method of the present invention and its core ideas; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.