CN212213953U - Compliant stent - Google Patents

Abstract

The utility model provides a be applied to gentle and agreeable support of human natural chamber way, including front end portion and back end portion, and set up in front end portion with transition portion between the back end portion. The utility model discloses a support, including the preceding section portion, transition portion, back end portion, and the exogenic action of outer power, the preceding section portion the transition portion with any kind of emergence of back end portion restorable deformation's in-process, the lateral surface of preceding section portion the lateral surface of transition portion with the lateral surface of back end portion meets in order and forms continuous smooth curved surface, the medial surface of preceding section portion the medial surface of transition portion with the medial surface of back end portion meets in order and forms another continuous smooth curved surface, can prevent the phenomenon that the support arris is inside or outside perk in the good chamber way physiology is crooked in adaptation.

Description

Compliant stent

Technical Field

The utility model relates to the technical field of medical equipment, especially, relate to gentle and agreeable support.

Background

At present, stent technology has been widely applied to organs such as arterial blood vessels, venous blood vessels, ureters, esophagus, colon, duodenum or biliary tract. The existing stents can not be used alternatively, and factors such as physiological anatomical structures of blood vessels at various parts and the like must be considered, for example, for the vascular stent, compared with veins and arteries, the diameter of the blood vessel is smaller, the bending form is more complex, the structure of intravascular tissues is complex, and the requirements on the positioning, the supporting performance and the flexibility of the vascular stent are higher.

Chinese utility model patent publication No. CN207640533U discloses an aortic stent having a three-stage structure, which is configured to conform to and fit with the intima of the blood vessel by arranging flexible branch stents between the main stents at the head and tail ends as a transition. However, the difference between the structure of the branch stent and the structure of the main stent is too large, and the phenomenon that the stent edges tilt inwards or outwards easily occurs at the joint of the branch stent and the main stent in the bending process of the blood vessel stent, so that thrombus is easily formed, restenosis of the blood vessel is caused, and the treatment effect is seriously influenced.

Therefore, there is a need for a new type of compliant stent that avoids the above-mentioned problems of the prior art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a be applied to gentle and agreeable support of human natural chamber way to prevent the inward or outward perk phenomenon of support arris when well adaptation chamber way physiology is crooked.

In order to achieve the above object, the compliant stent of the present invention comprises a front section and a rear section, and a transition section disposed between the front section and the rear section, wherein the front section, the transition section, and the rear section all have resilience to allow restorable deformation under external force; in the process of any one of the front section part, the transition part and the rear section part undergoing the restorable deformation, the outer side surface of the front section part, the outer side surface of the transition part and the outer side surface of the rear section part are sequentially connected to form a continuous smooth curved surface, and the inner side surface of the front section part, the inner side surface of the transition part and the inner side surface of the rear section part are sequentially connected to form another continuous smooth curved surface.

The beneficial effects of gentle and agreeable support lie in: the utility model discloses a support, including the preceding section portion, transition portion, back end portion, and the exogenic action of outer power, the preceding section portion the transition portion with any kind of emergence of back end portion restorable deformation's in-process, the lateral surface of preceding section portion the lateral surface of transition portion with the lateral surface of back end portion meets in order and forms continuous smooth curved surface, the medial surface of preceding section portion the medial surface of transition portion with the medial surface of back end portion meets in order and forms another continuous smooth curved surface, can prevent the phenomenon that the support arris is inside or outside perk in the good chamber way physiology is crooked in adaptation.

Preferably, in the process of any one of the front section part, the transition part and the rear section part undergoing the recoverable deformation, a continuous relationship between curved surfaces formed by the side surfaces of the front section part and the transition part is curvature continuity, and a continuous relationship between curved surfaces formed by the side surfaces of the transition part and the rear section part is curvature continuity. The beneficial effects are that: the phenomenon that the edges of the bracket tilt inwards or outwards is prevented.

Further preferably, the transition portion includes an open-loop transition portion and a closed-loop transition portion that meet to respectively with the front section portion meet with the rear section portion, the motion trend of open-loop transition portion under the exogenic action with the motion trend of closed-loop transition portion under the exogenic action is different. The beneficial effects are that: the open loop transition portion with closed loop transition portion adjusts through opposite movement trend the degree of curvature of transition portion is thereby favorable to making anterior segment closed surface the closed curved surface of transition with the closed curved surface of back end forms continuous smooth curved surface.

Further preferably, the rigidity of the front section is greater than the rigidity of the rear section, and the rigidity of the open-loop transition is less than the rigidity of the closed-loop transition. The beneficial effects are that: the front section part with large rigidity is connected through the open-loop transition part with small rigidity, and the rear section part with small rigidity is connected through the closed-loop transition part with large rigidity, so that the bending degree of the front section part and the rear section part can be respectively adjusted, and the phenomenon that the support edge is inwards or outwards tilted is prevented.

Further preferably, the ring-opening transition portion, the terminal surface of the front section portion and the front end surface of the closed-loop transition portion form a plurality of front closed structures which are sequentially connected around the circumferential direction, the closed-loop transition portion is composed of a plurality of rear closed structures which are sequentially connected around the circumferential direction, and the front closed structures and the rear closed structures are connected to form a W shape.

Further preferably, in the planar deployment structure of the compliant stent, the front closure structure and the rear closure structure have the same structure.

Further preferably, the front end face of the closed-loop transition portion comprises a plurality of front-end transition protrusions, and the front-end transition protrusions are connected with the open-loop transition portion.

Preferably, the rear end face of the closed-loop transition section includes a plurality of rear end transition projections, and a part of the plurality of rear end transition projections is connected to the front end face of the rear section portion.

Further preferably, the open-loop transition portion comprises a plurality of front connecting bridges, and one end of each front connecting bridge is connected with each front-end transition protrusion in a one-to-one correspondence manner.

Further preferably, the end face of the front section includes a plurality of end protrusions, and each end protrusion is connected to the other end of each front connecting bridge in a one-to-one correspondence manner.

Preferably, the front section comprises a free opening end surface, the free opening end surface comprises a plurality of protrusions to form an opening inclined surface, and the opening inclined surface is inclined to the axis of the front section. The beneficial effects are that: the stent is beneficial to adapting to the physiological structure of the bifurcation of a natural orifice of a human body, and avoids the problem that the flow of blood on the opposite side is influenced due to the protrusion of the proximal end of the stent in the prior art, or the problem of natural orifice restenosis easily caused by the fact that the stent cannot effectively cover the lesion position and cannot provide reasonable radial supporting force due to the fact that the stent is too far away from the bifurcation.

Further preferably, in the planar unfolding structure of the front section, the connecting lines between the top ends of the protrusions form at least one linear contour line or at least one nonlinear contour line.

Further preferably, the non-linear contour line includes an arc contour line, and in the planar unfolding structure of the front section, the arc contour line is bent away from an axis of the front section.

Preferably, the image forming apparatus further includes a marking portion that is provided on at least one of the free opening end surface of the front stage portion and the free opening end surface of the rear stage portion and is caulked or filled with a developing metal.

Drawings

FIG. 1 is a schematic structural diagram of a vascular stent under the action of external force in the prior art;

FIG. 2 is an enlarged schematic view of portion A of FIG. 1;

FIG. 3 is a schematic view showing the combination of curved convex surfaces formed by points on the surface of each segment after the segments of another prior art stent are curved;

FIG. 4 is a schematic view of the structure of FIG. 3 in which the continuous relationship between the curved convex surfaces is formed in a state of continuous curvature;

FIG. 5 is a schematic structural view of a compliant support according to an embodiment of the present invention;

FIG. 6 is a schematic view of a flat-out configuration of the compliant stent shown in FIG. 5 taken along the A-A cutting direction;

FIG. 7 is an enlarged schematic view of the portion B shown in FIG. 6;

FIG. 8 is a schematic view of the closed loop transition shown in FIG. 6;

FIG. 9 is a schematic view of the intravascular stent shown in FIG. 1 in an operating state after being implanted into a human body;

FIG. 10 is a schematic view of the compliant stent shown in FIG. 5 in an operative position after insertion into a human body;

fig. 11 is a schematic structural view of another front section according to an embodiment of the present invention;

FIG. 12 is a schematic view of the front section of FIG. 11 in a flat, unfolded configuration along the A-A cutting direction.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the drawings of the present invention are combined to clearly and completely describe the technical solutions in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention. Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. As used herein, the word "comprising" and similar words are intended to mean that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items.

Fig. 1 is a schematic structural view of a vascular stent under an external force according to the prior art, and fig. 2 is an enlarged structural view of a portion a shown in fig. 1.

Referring to fig. 1 and 2, the stent 1 is composed of a rigid portion 11 and a flexible portion 12 which are connected in series. Since the rigid part 11 needs to provide sufficient radial support force, the flexible part 12 is primarily responsible for providing good adherence performance, and the rigidity of the rigid part 11 needs to be greater than that of the flexible part 12. However, when any one of the rigid portion 11 and the flexible portion 12 is deformed by an external force, the degree of deformation of the rigid portion 11 is smaller than that of the flexible portion 12, and a significant dent is likely to be generated in the flexible portion 12 in the vicinity of the joint between the rigid portion 11 and the flexible portion 12, and a ridge phenomenon toward the inside of the stent 1 as shown in fig. 2 is likely to be generated. Such a ridge appears to adhere to blood more readily than other surfaces without ridges, thereby increasing the incidence of thrombosis and causing restenosis of the vessel, severely affecting the therapeutic effect.

In addition, some prior art vascular stents, such as the vascular stent disclosed in CN207640533U, have a multi-stage structure to improve flexibility. However, the multi-segment combination also means that the adjacent segments are more prone to have protrusions. For convenience of description and understanding, the following description will be made by combining the first curved convex surface, the second curved convex surface and the third curved convex surface formed by the points on the surfaces of the respective portions after the rigid portion, the intermediate portion and the flexible portion, which are sequentially connected in the prior art, are curved.

It should be noted that the first curved convex surface, the second curved convex surface, and the third curved convex surface are all virtual continuous surfaces.

Fig. 3 is a schematic view showing the combination of curved convex surfaces formed by points on the surface of each section after each section of another vessel stent of the prior art is bent. Fig. 4 is a schematic structural view illustrating a continuous relationship between curved convex surfaces of fig. 3, in which curvature is continuous.

In the prior art, due to the fact that the connecting structure among the rigid part, the middle part and the flexible part which are connected in sequence is not properly designed, the edge protrusion phenomenon is easy to occur at the joint of each part in the bending process of the blood vessel support.

Specifically, referring to fig. 3, the curved surfaces of the first curved convex surface 14, the third curved convex surface 15, and the second curved convex surface 16 connecting the first curved convex surface 14 and the third curved convex surface 15 are smooth continuous curved surfaces, but a first ridge 17 appears at the junction of the first curved convex surface 14 and the second curved convex surface 16, and a second ridge 18 appears at the junction of the second curved convex surface 16 and the third curved convex surface 15. In this case, the surface continuity relationship between the three curved surfaces is point continuity.

More specifically, the meaning of the point continuum is: the end points of the joints of two adjacent geometric structures coincide, but the tangential direction and curvature of the joints are not identical, so that the first and second protrusions 17 and 18 shown in fig. 3 are represented.

In order to avoid the first ridge 17 and the second ridge 18 shown in fig. 3, referring to fig. 4, it is necessary that the curved surface formed by the first curved convex surface 14 and the second curved convex surface 16 is a continuous smooth curved surface, and the curved surface formed by the second curved convex surface 16 and the third curved convex surface 15 is a continuous smooth curved surface, that is, the continuous relationship of the curved surfaces between the three curved surfaces is curvature continuity.

More specifically, the curvature continuity means: the end points of the connecting positions of the two adjacent geometric structures are coincident and have the same tangential direction, and the curvature of each connecting point is also the same.

In order to solve the problems existing in the prior art, the embodiment of the utility model provides a be applied to gentle and agreeable support of human natural orifice way.

Specifically, the natural orifice of the human body includes any one of blood vessels, digestive tract, urinary tract and reproductive tract.

Fig. 5 is a schematic structural view of a compliant stent according to some embodiments of the present invention. FIG. 6 is a schematic view of a flat-out configuration of the compliant stent shown in FIG. 5 taken along the A-A cutting direction. Fig. 7 is an enlarged structural view of a portion B shown in fig. 6.

The embodiment of the present invention provides a "plane unfolding structure", taking fig. 5 as an example, specifically indicates that the side wall of the front section 21 is cut along the cutting direction a-a, and then is unfolded in the structure formed on the same plane without folds according to the actual shape and size of each unit area plane.

Referring to FIGS. 5 and 6, the compliant stent 2 includes a front stage 21 and a rear stage 23, and a transition 22 disposed between the front stage 21 and the rear stage 23. The front section 21 is formed by connecting a plurality of front section closed loop structures 211 in sequence to provide sufficient radial supporting force.

In the embodiment of the present invention, the front section 21, the transition section 22 and the rear section 23 all have resilience to be deformed in a restorable manner under the action of external force.

Rebound elasticity refer to the external force that leads to object deformation and remove the back, the ability of its original shape of recovery that the object has.

Specifically, the front-end closed-loop structure 211 is a diamond shape. In some embodiments of the present invention, each side length of the front-section closed-loop structure 211 is 2-7 mm, so that after the front-section portion 21 is deformed under the action of external force, the curved surface formed by the outer side surface and the curved surface formed by the inner side surface are continuous smooth curved surfaces.

Referring to fig. 6 and 7, the rear section 23 is formed by sequentially connecting a plurality of wavy structures 231 in the direction of the axis 24, and adjacent wavy structures 231 are connected by a rear connecting bridge 31.

Taking the wave structure 231 as an example, the wave structure 231 is formed by sequentially connecting a plurality of V-shaped structures (not marked in the figure) around the circumferential direction to have a plurality of wave crests and a plurality of wave troughs, and two wave trough structures are spaced between adjacent connecting rods among the connecting rods connecting the wave structure 231, so as to endow the rear section portion 23 with good adherence performance.

Furthermore, the side length of the V-shaped structure (not shown in the figures) is 2-3 mm, the vertical distance between adjacent wave structures is 0.8-1 mm, the rear connecting bridge 31 is inclined to the axis, and an acute angle formed between the rear connecting bridge and the axis 24 is 60-80 degrees, so that after the rear section part 23 deforms under the action of external force, a curved surface formed by the outer side surface and a curved surface formed by the inner side surface are both continuous smooth curved surfaces.

In some embodiments of the present invention, the axis 24 is the central axis of the compliant support 2.

In order to make the transition closed curved surface formed on the outer surface of the transition portion 22 after the transition portion is deformed by an external force be a continuous smooth curved surface, referring to fig. 5 and 6, the transition portion 22 includes an open-loop transition portion (not shown) composed of a plurality of front connecting bridges 221 and a closed-loop transition portion (not shown) composed of a plurality of rear closing structures 223.

In some embodiments, the rigidity of the front section 21 is greater than the rigidity of the rear section 23, the rigidity of the open-loop transition portion is less than the rigidity of the closed-loop transition portion, and is relative to the front section 21, the rigidity of the open-loop transition portion is less, the front section 21 is greater, and is relative to the rear section 23, the rigidity of the closed-loop transition portion is greater, the rigidity of the closed-loop transition portion is less, the rear section 23 can be adjusted respectively, the front section 21 and the bending degree of the rear section 23 are adjusted, and therefore the phenomenon that the support rib is tilted inwards or outwards is prevented.

The utility model discloses in some embodiments, the motion trend of ring-opening transition portion under the exogenic action with the motion trend of closed loop transition portion under the exogenic action is different, thereby is favorable to the front segment portion the transition portion with any one kind of emergence of back segment portion restorable deformation's in-process, the curved surface that the side of front segment portion formed with curved surface continuous relation between the curved surface that the side of transition portion formed is continuous for the camber, the curved surface that the side of transition portion formed with curved surface continuous relation between the curved surface that the side of back segment portion formed is continuous for the camber.

In some embodiments of the present invention, the movement trend of the open-loop transition portion under the external force is opposite to the movement trend of the closed-loop transition portion under the external force.

Specifically, referring to fig. 5 and 6, a plurality of the front connecting bridges 221 are parallel to each other, one end of each front connecting bridge 221 is connected to the end surface of the front section 21, and the other end is connected to the front end surface of the closed loop transition portion (not shown).

More specifically, the front end face of the front section 21 is formed by sequentially connecting a plurality of front section closed loop structures 211 around the circumferential direction, the plurality of front section closed loop structures 211 have a plurality of terminal protrusions 212 facing the rear section 23, one end of each front connecting bridge 221 is connected to one terminal protrusion 212, and all the terminal protrusions 212 are connected to the front connecting bridge 221.

Fig. 8 is a schematic view of the closed loop transition shown in fig. 6.

Referring to fig. 6 and 8, the closed loop transition portion (not shown) is formed by connecting a plurality of the rear closing structures 223 in sequence, the front end surface is formed with a plurality of front end transition protrusions 41, and the rear end surface is formed with a plurality of rear end transition protrusions 42.

Specifically, the front end transition protrusions 41 are connected to the open-loop transition portion.

More specifically, referring to fig. 6 and 8, the other end of each front connecting bridge 221 is connected to one front end transition protrusion 41, so that the front closing structures 222 sequentially connected in the circumferential direction are formed by the end faces of the open-loop transition portion, the front section portion 21 and the front end face of the closed-loop transition portion.

Specifically, a part of the rear end transition projections 42 is connected to the front end surface of the rear section portion 23.

More specifically, referring to fig. 6, 7 and 8, a portion of the rear end transition protrusions 42 is connected to the front end surface of the rear section portion 23 through the rear connecting bridges 31, the rear end transition protrusions 42 form a rear transition wave structure 44, and the rear transition wave structure 44 and the wave structure 231 have the same structure. The connection manner between the rear end transition protrusions 42, the rear connection bridges 31 and the wave structures 231 is the same as the connection manner between the adjacent wave structures 231, which is not described herein again.

More specifically, referring to fig. 6 and 8, a partial structure of the front closure structure 222 and a partial structure of the rear closure structure 223 are overlapped to form a front transition wave structure 43 having the same structure as the wave structure 231.

More specifically, referring to fig. 6 and 8, the connection structure 45 between the front transition wave structure 43 and the rear transition wave structure 44 has the same structure as the front connection bridge 221.

In some embodiments, the extension line of the connection structure 45 and the acute angle that the axis 24 pressed from both sides with the extension line of the front connection bridge 221 with the acute angle that the axis 24 pressed from both sides is the same, just the extension line orientation of the connection structure 45 the terminal surface of the front section part 21 extends, the extension line orientation of the front connection bridge 221 the preceding terminal surface of the rear section part 23 extends.

In some embodiments, the front closure structure 222 and the rear closure structure 223 meet to form a W-shape.

More specifically, in the planar expanded configuration of the compliant stent 2, the front closure structure 222 and the rear closure structure 223 have the same structure.

Fig. 9 is a schematic view of another prior art vascular stent in an operative state after being implanted into a human body.

Referring to fig. 9, a first blood vessel 51, a second blood vessel 52 and a third blood vessel 53 in a human body meet to form a blood vessel branching structure, and when a lesion exists at a position of the blood vessel branching structure close to the first blood vessel 51, a plain blood vessel stent 54 needs to be inserted into the first blood vessel 51 and reach the blood vessel branching structure. Since the front end 541 of the stent 54 is perpendicular to the stent axis (not shown), in order to place the stent 54 in a vessel bifurcation structure and generate sufficient supporting force to keep the position of the stent relative to the first blood vessel 51 unchanged, the front end 541 needs to extend out of the intersection of the first blood vessel 51 and the second blood vessel 52, but this placement method can easily significantly affect the blood flow of the second blood vessel 52 and the third blood vessel 53. If the flat-mouth stent 54 is placed in the first blood vessel 51 and the front end surface 541 is far away from the bifurcation structure of the blood vessel, the lesion cannot be completely covered, and the problem of restenosis of the blood vessel is easily caused due to insufficient proximal supporting force of the flat-mouth stent 54.

To solve the above problem, referring to fig. 5 and 6, the free opening end surface of the front section 21 includes a plurality of protrusions 25 to form an opening slope 213 inclined to the axis 24.

FIG. 10 is a schematic view of the compliant stent shown in FIG. 5 in an operative position after insertion into a human body.

Referring to fig. 5 and 10, when the flexible stent 2 is inserted into the first blood vessel 51 and reaches the blood vessel bifurcation structure, the opening slope 213 is inclined to the axis 24, so that the flexible stent 2 can be easily placed at the bifurcation of the blood vessel bifurcation structure to adapt to the physiological structure of the blood vessel bifurcation structure, and simultaneously, the influence of the structure extending out of the intersection of the first blood vessel 51 and the second blood vessel 52 on the blood flow is minimized, the diseased position can be effectively covered, and the problem of blood vessel restenosis caused by insufficient proximal support force is avoided.

In some embodiments of the present invention, the acute angle between the opening inclined plane 213 and the axis 24 is 20-80 degrees.

In some embodiments of the present invention, in the plane unfolding structure of the front section 21, the line between the tops of the protrusions 25 forms at least one linear contour line or at least one non-linear contour line.

Referring to fig. 6, in the planar expanded structure of the front section 21, the adjacent linear contour lines are a first linear contour line 261 and a second linear contour line 262, respectively. The first and second linear contour lines 261, 262 intersect the axis 24 and are both oblique to the axis 24. The first and second linear contour lines 261, 262 are mirror images of each other with respect to the axis 24.

The utility model discloses some embodiments, first linear contour line 261 with in the second linear contour line 262 arbitrary one with the acute angle alpha that axis 24 pressed from both sides is 20-80 degrees to more accord with the anatomical form of blood vessel bifurcation department, satisfy the best blood vessel and cover the effect, furthest reduces the influence that the structure that stretches out the blood vessel junction caused to blood flow, and avoids the blood vessel restenosis problem because the near-end holding power is not enough to cause.

If the included acute angle α is too large, in order to facilitate the in vivo placement without displacement, the flexible stent 2 must be placed like the plain vascular stent 54 shown in fig. 9, so that the front section 21 can extend out of the junction of the first blood vessel 51 and the second blood vessel 52 more easily, thereby affecting the blood flow on the opposite side and causing unnecessary injury to the human body in the process of being placed into the human body; if the included angle of the acute angle alpha is too small, the front end of the flexible stent 2 is too sharp, so that sufficient radial supporting force cannot be generated, and the problem of blood vessel restenosis is easily caused.

In some embodiments, the acute angle between the first linear contour line 261 and the second linear contour line 262 and the axis 24 is any one of 30 degrees, 40 degrees, 50 degrees, 60 degrees and 70 degrees.

The utility model discloses in some embodiments, the non-linear contour line includes the arc contour line, in the plane expansion structure of front end portion, the arc contour line is kept away from the axis of front end portion is crooked.

The utility model discloses in some embodiments, the paraxial end of arc outline line is formed the tangent line of arc outline line with pass through contained angle between the perpendicular line that the paraxial end formed is 0-70 degrees, the perpendicular line perpendicular to the axis of front segment portion 21, the paraxial end does the arc outline line is close to the one end of front segment portion 21 axis.

Fig. 11 is a schematic structural view of another front section according to an embodiment of the present invention. FIG. 12 is a schematic view of the front section of FIG. 11 in a flat, unfolded configuration along the A-A cutting direction.

Referring to fig. 11 and 12, in the planar unfolding structure of the front section shown in fig. 11, the connecting lines between the top ends of the protrusions 25 form a first arc-shaped contour line 81 and a second arc-shaped contour line 82 which are adjacent to each other, and both the first arc-shaped contour line 81 and the second arc-shaped contour line 82 are bent away from the axis 24 and meet at the same meeting point 83. The junction 83 is the proximal end of the first arcuate contour 81 and the proximal end of the second arcuate contour 82.

Specifically, the first arcuate contour 81 and the second arcuate contour 82 are mirror images of each other with respect to the axis 24. Taking the first arc-shaped contour line 81 as an example, a tangent formed at the proximal end of the first arc-shaped contour line 81 is a first tangent 84, and a perpendicular line passing through the intersection 83 to the axis 24 is a first perpendicular line 85.

In some embodiments of the present invention, referring to fig. 11, the included angle γ between the first tangent line 84 and the first perpendicular line 85 is 0-70 degrees.

In some embodiments, referring to fig. 5 and 6, the compliant support 2 further includes a mark portion 27, the mark portion 27 is disposed on at least one of the free opening end surface of the front section portion 21 and the free opening end surface of the rear section portion 23 to be riveted or filled with a developing metal.

Although the embodiments of the present invention have been described in detail hereinabove, it is apparent to those skilled in the art that various modifications and variations can be made to these embodiments. However, it is to be understood that such modifications and variations are within the scope and spirit of the present invention as set forth in the appended claims. Moreover, the invention as described herein is capable of other embodiments and of being practiced or of being carried out in various ways.

Claims (14)

1. The utility model provides a gentle and agreeable support, is applied to human natural chamber and says, includes front end portion and back end portion, and set up in front end portion with transition portion between the back end portion, its characterized in that:

the front section part, the transition part and the rear section part are all resilient so as to be subjected to restorable deformation under the action of external force;

in the process of any one of the front section part, the transition part and the rear section part undergoing the restorable deformation, the outer side surface of the front section part, the outer side surface of the transition part and the outer side surface of the rear section part are sequentially connected to form a continuous smooth curved surface, and the inner side surface of the front section part, the inner side surface of the transition part and the inner side surface of the rear section part are sequentially connected to form another continuous smooth curved surface.

2. The compliant stent of claim 1 wherein during the recoverable deformation of any of the front section, the transition section, and the back section, the continuity of curvature between the curved surface formed by the side of the front section and the curved surface formed by the side of the transition section is continuity of curvature, and the continuity of curvature between the curved surface formed by the side of the transition section and the curved surface formed by the side of the back section is continuity of curvature.

3. The compliant stent of claim 2 wherein the transition portion comprises an open loop transition portion and a closed loop transition portion that meet to meet the front segment portion and the back segment portion, respectively, the open loop transition portion having a different tendency to move under an external force than the closed loop transition portion.

4. The compliant stent of claim 3 wherein the stiffness of the leading section is greater than the stiffness of the trailing section and the open loop transition is less than the stiffness of the closed loop transition.

5. The compliant stent of claim 3 wherein the open loop transition, the distal end surface of the front section, and the front end surface of the closed loop transition form a plurality of front closed structures that are sequentially connected in a circumferential direction, the closed loop transition is composed of a plurality of rear closed structures that are sequentially connected in a circumferential direction, and the front closed structures and the rear closed structures are connected to form a W-shape.

6. The compliant stent of claim 5 wherein the front and back closure structures have the same structure in the planar expanded configuration of the compliant stent.

7. The compliant stent of claim 5 wherein the front face of the closed loop transition comprises a plurality of front end transition projections, each of the plurality of front end transition projections connecting to the open loop transition.

8. The compliant stent of claim 7 wherein the back end surface of the closed loop transition section comprises a plurality of back end transition projections, a portion of the plurality of back end transition projections interfacing with the front end surface of the back section portion.

9. The compliant stent of claim 8 wherein the open loop transition comprises a plurality of front connecting bridges, one end of each front connecting bridge being connected to each front end transition protrusion in a one-to-one correspondence.

10. The compliant stent of claim 9 wherein the distal end face of the front section comprises a plurality of distal protrusions, each of the distal protrusions being connected to the other end of each of the front connecting bridges in a one-to-one correspondence.

11. The compliant stent of claim 1 wherein the front section includes a free open end surface comprising a plurality of protrusions to form an open ramp that is oblique to the axis of the front section.

12. The compliant stent of claim 11 wherein the planar expansile structure of the anterior segment wherein the connecting lines between the plurality of convex apices form at least one linear contour or at least one non-linear contour.

13. The compliant stent of claim 12 wherein the non-linear contour comprises an arcuate contour that curves away from the axis of the anterior segment in the planar expanded configuration of the anterior segment.

14. The compliant stent of claim 1 further comprising a marker disposed on at least one of the open end face of the front section and the open end face of the back section and riveted or filled with a developed metal.

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