CN112998920B - Conveyor and rack system - Google Patents

Abstract

The invention relates to a conveyor and a conveying system, wherein the conveyor comprises a conveying sheath pipe, the conveying sheath pipe comprises a polymer pipe and a reinforcing pipe arranged in the polymer pipe, the reinforcing pipe comprises a first pipe section and a second pipe section which are connected in the length direction of the reinforcing pipe, the first pipe section is positioned at the proximal end of the second pipe section, a first supporting structure formed by materials is arranged in the first pipe section, a second supporting structure formed by materials is arranged in the second pipe section, and the flexibility of the first supporting structure is smaller than that of the second supporting structure. The delivery device of the invention can prevent the delivery sheath from entering the branch vessel when the delivery sheath passes through the aortic arch.

Description

Conveyor and rack system

Technical Field

The invention relates to the field of interventional medical instruments, in particular to a conveyor and a bracket system.

Background

Vascular diseases, including vascular dissection and hemangiomas, have considerable demands on the tolerance of patients if the vascular disease is treated by surgery. The minimally invasive interventional operation treats vascular diseases and has the advantages of small trauma, low complication and mortality rate and the like. As a result, the treatment of vascular diseases by interventional procedures is gaining increasing acceptance by doctors and patients.

When a diseased site occurs in the ascending aorta, the treatment of vascular disease at that site by interventional procedures presents a significant challenge due to the special structure of the ascending aorta. Specifically, referring to fig. 1, the aortic vessel 10 includes a descending aorta 11, an aortic arch 12 and an ascending aorta 13, wherein the descending aorta 11 and the ascending aorta 13 can be regarded as substantially cylindrical vessels, the aortic arch 12 is located between the descending aorta 11 and the ascending aorta 13 to communicate the two vessels, the aortic arch 12 is substantially circular arc-shaped, and a large curved side (a large curved side refers to a side with a larger radius of curvature when the tubular structure is in a curved state) of the aortic arch 12 has three branched vessels 121 identical to a vessel lumen thereof. Referring to fig. 2, in the interventional operation, the delivery path of the instrument is the descending aorta 11, the aortic arch 12, and the ascending aorta 13 in this order. That is, the delivery path must be along the guidewire 15 through the curved aortic arch 12, and the sheath 14 of the delivery device generally needs to have a certain structural strength (i.e., the sheath 14 needs to maintain its straight cylindrical shape), thereby avoiding buckling of the sheath 14 and further avoiding blockage of the delivery channel of the sheath 14. Thus, the distal end of the sheath 14 (i.e., the end distal to the operator) remains straight while passing through the aortic arch 12, and movement of the distal end of the sheath 14 in the radial direction of the aortic arch 12 tends to cause the distal end of the delivery sheath 14 to puncture or pierce the vessel wall of the aortic arch 12, and as the distal end of the sheath 14 passes through the opening of the branch vessel 121, it tends to enter the branch vessel 121, thereby causing surgical failure.

Disclosure of Invention

Based on this, it is necessary to provide a delivery sheath to solve the problem that the delivery sheath in the prior art easily enters into the branch vessel when passing through the aortic arch.

The utility model provides a conveyer, includes the transportation sheath pipe, and the transportation sheath pipe includes the polymer pipe and locates the reinforcement pipe in the polymer pipe, and the reinforcement pipe is along its length direction including first pipe section and the second pipeline section that links to each other, and first pipeline section is located the proximal end of second pipeline section, includes first bearing structure in the first pipeline section, includes second bearing structure in the second pipeline section, and first bearing structure's flexibility is less than second bearing structure's flexibility.

In one embodiment, the second support structure comprises a large curved side support and a small curved side support connected in a loop, the large curved side support having a flexibility that is less than the flexibility of the small curved side support.

In one embodiment, the large curved side support and the small curved side support are provided with gaps, and the material density of the large curved side support is higher than that of the small curved side support.

In one embodiment, the stiffening tube further comprises a keel coupled to the major and/or minor bend side supports, the keel having a flexibility less than that of the major bend side supports and the keel having a flexibility less than that of the minor bend side supports.

In one embodiment, the keel is provided with a plurality of hollowed-out holes along its length.

In one embodiment, the small-curve side support member includes, along a length direction thereof, a first section, a second section, and a third section connected to each other, a proximal end of the first section being connected to the first support structure, the second section being located between the first section and the third section, the third section being connected to a distal end of the second section, a flexibility of the first section being smaller than a flexibility of the second section, and a flexibility of the third section being smaller than a flexibility of the second section.

In one embodiment, the polymer tube includes an inner tube and an outer tube, the inner tube forms a delivery channel for delivering the sheath tube, the reinforcing tube is disposed outside the inner tube, and the outer tube encloses the reinforcing tube and the inner tube.

In one embodiment, the outer tube comprises a large-bend side outer tube and a small-bend side outer tube which are annularly connected, and the flexibility of the large-bend side outer tube is smaller than that of the small-bend side outer tube.

In one embodiment, the small-bend side outer wrapping pipe comprises a first outer pipe body, a second outer pipe body and a third outer pipe body, wherein the first outer pipe body, the second outer pipe body and the third outer pipe body are connected along the length direction of the small-bend side outer wrapping pipe, the first outer pipe body is radially overlapped with the first section, the second outer pipe body is radially overlapped with the second section, the third outer pipe body is radially overlapped with the third section, the flexibility of the first outer pipe body is smaller than that of the second outer pipe body, and the flexibility of the third outer pipe body is smaller than that of the second outer pipe body.

In one embodiment, a stent system comprises a vascular stent and the delivery sheath described above, the vascular stent being delivered to a desired location by a delivery device.

When the conveyor is used, the flexibility of the second supporting structure is larger than that of the first supporting structure (namely, the flexibility of the first supporting structure is smaller than that of the second supporting structure), and the distal end of the second supporting structure is positioned at the distal end of the first supporting structure, so that the tube body positioned at the distal end side of the first supporting part in the conveying sheath tube has better flexibility than the tube body positioned at the proximal end side of the first supporting part, the tube body of the portion can better adapt to the shape of a curved blood vessel such as an aorta, and when the distal end of the conveying sheath tube passes through the aortic arch, the tube body positioned at the distal end side of the first supporting part in the conveying sheath tube can conform to the curved shape of the aortic arch, the distal end part of the conveying sheath tube can be ensured to cross the opening of the branch blood vessel approximately along the extending direction parallel to the inner wall of the aortic arch, and the distal end of the conveying sheath tube body is prevented from entering the branch blood vessel due to overlarge hardness. The device can also avoid that the distal end of the delivery sheath tube is always kept in a straight line shape due to overlarge hardness of the distal end of the delivery sheath tube, and further avoid that the distal end of the delivery sheath tube punctures or punctures the vessel wall of the aortic arch along the radial direction of the aortic arch.

Drawings

FIG. 1 is a schematic diagram of an aortic vessel

Fig. 2 is a state diagram of a prior art delivery sheath passing through the aortic arch.

Fig. 3 is a schematic view showing the structure of a delivery sheath according to a first embodiment of the present invention.

Fig. 4 is a schematic structural view of a delivery sheath according to a second embodiment of the present invention.

Fig. 5 is a cross-sectional view of a delivery sheath in a second tube segment in a first embodiment of the invention.

Fig. 6 is a schematic structural view of a reinforcing pipe according to a first embodiment of the present invention.

Fig. 7 is a cross-sectional view of a large-curve side support and a small-curve side support in the first embodiment of the present invention.

Fig. 8 is a cross-sectional view of an outer tube in a first embodiment of the present invention.

Fig. 9 is a schematic view showing the structure of an outer tube in the first embodiment of the present invention.

Fig. 10 is a view showing a stent system passing through an aortic arch in accordance with the first embodiment of the present invention.

Detailed Description

In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit or scope of the invention, which is therefore not limited to the specific embodiments disclosed below.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

For purposes of more clarity in describing the structure of the present invention, the terms "distal" and "proximal" are used as terms of orientation which are conventional in the art of interventional medical devices, wherein "distal" refers to the end of the procedure that is remote from the operator and "proximal" refers to the end of the procedure that is proximal to the operator.

The axial direction refers to a direction parallel to a connecting line of the distal center and the proximal center of the medical instrument; the radial direction refers to a direction perpendicular to the axial direction.

The present embodiment provides a conveyor 2 comprising a delivery sheath 20.

Referring to fig. 4, the delivery sheath 20 includes a polymer tube 21 and a reinforcement tube 31 disposed in the polymer tube 21. The delivery sheath 20 may also be a straight tube. Referring to fig. 5, in other embodiments, the distal tube of the delivery sheath 20 may be preformed to a set curved shape such that the shape of the delivery sheath 20 matches the shape of the aortic arch 12, and the delivery sheath 20 may be a straight tube that prevents the distal end of the delivery sheath 20 from sliding into the branch vessel 121.

The polymer tube 21 is formed with a delivery channel for delivering the sheath 20 through which the delivery device loads and releases the stent. The reinforcing tube 31 is arranged in the polymer tube 21, namely the reinforcing tube 31 is embedded in the tube wall of the polymer tube 21, so that radial strength and axial strength can be provided for the delivery sheath 20, the delivery sheath 20 is ensured to have good bending resistance, and the smoothness of a delivery channel is maintained, so that the vascular stent is loaded and released by the delivery device 2.

Referring to fig. 6, the reinforcement pipe 31 includes a first pipe section 310 and a second pipe section 320 connected to each other along a length thereof. It should be noted that the longitudinal direction of the reinforcement tube 31, i.e., the pushing direction of the delivery sheath 20.

Specifically, the first tube section 310 is located at the proximal end of the second tube section 320 (i.e., the second tube section 320 is located at the distal end of the first tube section 310), and the first tube section 310 includes a first support structure 311 formed of a material, where the material of the first support structure 311 may be an elastic material such as stainless steel, nitinol, or polymer fiber. The first support structure 311 may be a spiral structure or a mesh tube structure, wherein the mesh tube structure refers to a tubular body having at least one mesh. In this embodiment, the material of the first support structure 311 is stainless steel, and the first support structure 311 is a spiral structure, so the first support structure 311 can provide axial strength and radial strength, and the first support structure 311 has a certain elasticity, which can provide a certain flexibility for the delivery sheath 20, so that the delivery sheath 20 can conveniently pass through a curved vascular channel.

The second pipe section 320 includes a second supporting structure 321 formed of a material, and the material of the second supporting structure 321 may be an elastic material such as stainless steel, nickel-titanium alloy, and polymer fiber. The second support structure 321 may be a spiral structure or a mesh tube structure. In this embodiment, the material of the second support structure 321 is stainless steel, and the second support structure 321 is a spiral structure, so the second support structure 321 can provide axial strength and radial strength, and the first support structure 311 has a certain elasticity, which can provide a certain flexibility for the delivery sheath 20, so that the delivery sheath 20 can conveniently pass through a curved vascular channel.

The flexibility of the second support structure 321 is greater than the flexibility of the first support structure 311 (i.e., the flexibility of the first support structure 311 is less than the flexibility of the second support structure 321), and the distal end of the second support structure 321 that is located at the first support structure 311 allows the tube body of the delivery sheath 20 that is located at the second tube segment 320 to have better flexibility than the tube body that is located within the second tube segment 320, so that the portion of the tube body can better conform to the shape of the curved vessel such as the aortic arch 12. As the distal end of the delivery sheath 20 passes through the aortic arch 12, the tubular body of the delivery sheath 20 within the second tube segment 320 is capable of conforming to the curved shape of the aortic arch 12 such that the direction of extension of the tubular body of the delivery sheath 20 within the second tube segment 320 is parallel to the direction of extension of the inner wall of the aortic arch 12, ensuring that the distal end of the delivery sheath 20 is capable of traversing the opening of the branch vessel 121 generally in a direction parallel to the direction of extension of the inner wall of the aortic arch 12, avoiding entry of the distal end of the delivery sheath 20 into the branch vessel 121 due to excessive stiffness of the distal tubular body of the delivery sheath 20. Also, the distal end of the delivery sheath 20 may be prevented from puncturing or stabbing the vessel wall of the aortic arch 12 due to excessive stiffness of the distal end of the delivery sheath 20.

It should be noted that "flexibility" refers to the property of radial bending deformation after receiving a radial force, and the greater the magnitude of radial bending deformation, the greater the flexibility, and vice versa, the less the flexibility.

With continued reference to fig. 6, in this embodiment, the second support structure 321 includes a large curved side support 322, a small curved side support 323, and a keel 324, with the number of keels 324 being two. The proximal ends of the large curved side supports 322, the small curved side supports 323, and the proximal ends of the keels 324 are all radially flush (i.e., the proximal ends of the large curved side supports 322, the small curved side supports 323, and the proximal ends of the keels 324 lie in the same radial plane); the distal ends of the large curved side supports 322, the small curved side supports 323, and the distal ends of the keels 324 are all radially flush (i.e., the distal ends of the large curved side supports 322, the small curved side supports 323, and the distal ends of the keels 324 lie in the same radial plane).

The keel 324 is positioned between the large and small curved side supports 322 and 323 to space the large and small curved side supports 322 and 323, and the keel 324 is integrally connected with the large and small curved side supports 322 and 323. Specifically, the keel 324 is annularly connected to the large and small curved side supports 322, 323, and collectively forms the tubular configuration of the second support structure 321, with the large curved side support 322 being connected to the small curved side support 323 by the keel 324. The flexibility of the large-curve side support 322 is smaller than that of the small-curve side support 323. It should be noted that the large curved side supporting piece 322 and the small curved side supporting piece 323 are connected in a ring shape, so that a joint surface is formed at the joint of the large curved side supporting piece 322 and the small curved side supporting piece 323, the large curved side supporting piece 322 and the small curved side supporting piece 323 are connected at the joint surface, the second supporting structure 321 can be cut into a plurality of parts along the joint surface, and the parts can be mutually spliced to form a tube body of 360 degrees. For example, the round tube can be formed by connecting two identical semicircular tubes in a ring shape, and the ring connection can increase the corresponding central angle of the tube wall. The distinction between annular coupling is axial coupling, for example, two sections of round pipe are circumferentially coupled (i.e., axially coupled) to form a composite round pipe of longer axial length, which increases the axial length of the pipe wall.

When the delivery sheath 20 is bent and deformed in the passage of the aortic arch 12, resistance is generated in the deformation process, after the delivery sheath 20 is bent and deformed in the passage of the aortic arch 12, if the large curved side supporting piece 322 is aligned with the large curved side of the aortic arch 12, the small curved side supporting piece 323 is aligned with the small curved side of the aortic arch 12, at this time, the delivery sheath 20 is in the first bending state, and the first deformation resistance needs to be overcome in the process of changing the straight state of the delivery sheath 20 into the first bending state; after the delivery sheath 20 is bent and deformed in the passage of the aortic arch 12, if the small-curvature side support 323 is aligned with the large-curvature side of the aortic arch 12 and the large-curvature side support 322 is aligned with the small-curvature side of the aortic arch 12, the delivery sheath 20 is in the second bending state, and the second deformation resistance needs to be overcome during the transition of the delivery sheath 20 from the straight state to the second bending state.

Because the flexibility of the large curved side support 322 is smaller than that of the small curved side support 323, the first deformation resistance is smaller than the second deformation resistance, so that the delivery sheath 20 can be automatically switched to the first curved state rather than the second curved state when being deformed in the channel of the aortic arch 12, the large curved side support 322 is automatically aligned with the large curved side of the aortic arch 12, the small curved side support 323 is automatically aligned with the small curved side of the aortic arch 12, and when the branched vascular stent is delivered, the branch positioned on the large curved side of the vascular stent can be aligned with the branched vascular 121 positioned on the large curved side of the aortic arch 12, the implantation of the branched vascular stent can be facilitated, and the operation time can be saved.

Of course, in other embodiments, the keel 324 may be connected to only the major curved side supports 322, or only the minor curved side supports 323; the keel 324 is a separate structural component from the large and small curved side supports 322, 323 and is fixedly attached to each other by welding or other means.

Referring to fig. 7, in the present embodiment, the large-bend side supporting member 322 is a tube wall member, the tube wall member refers to a structural member having only a portion of the tube wall, and the tube wall is not provided with a complete tube wall in 360 ° in the circumferential direction, and the "structural member having only a portion of the tube wall" refers to a structure in which the tube wall of the tube wall member is discontinuous in 360 ° in the circumferential direction, that is, in any radial cross section of the tube wall member, the central angle corresponding to the cross section of the tube wall is smaller than 360 °. For example, cutting the tubular body along its central axis plane will form two tubular wall members, the two tubular walls constituting corresponding central angles of 180 °, cutting the tubular wall of the tubular body to form a cut surface, the cut surface corresponding to the circumferential ends (i.e. peripheral ends) of the tubular wall members.

In the present embodiment, the large-curve side support 322 is a pipe wall member formed by the second support structure 321 (the large-curve side support 322 is a pipe wall member formed by a spiral). In the circumferential direction of the reinforcement pipe 31, the large-bend side support 322 includes a circumferential end 322a; the small-curve side support 323 is a pipe wall member, the small-curve side support 323 is a pipe wall member formed by the second support structure 321 (the small-curve side support 323 is a pipe wall member formed by a spiral body), and the pitch of the small-curve side support 323 is larger than that of the large-curve side support 322. In the circumferential direction of the reinforcement pipe 31, the small-curve side support 323 includes a peripheral end 323a, and the peripheral end 323a of the small-curve side support 323 is correspondingly connected with the peripheral end 322a of the large-curve side support 322, that is, the small-curve side support 323 is annularly connected with the large-curve side support 322. The range of the central angle corresponding to the pipe wall of the large-curve side support 322 is [90 °,180 ° ], and the range of the central angle corresponding to the pipe wall of the small-curve side support 323 is [180 °,270 ° ], the flexibility of the flexible second support structure 321 can be increased, and the transfer sheath 20 can be switched to the first curved state more easily.

The large-curve side support 322 and the small-curve side support 323 have gaps, and the gaps can be spiral extending gaps or grid-shaped gaps. The material density of the large-curve side support 322 is greater than that of the small-curve side support 323, so that the flexibility of the small-curve side support 323 is greater than that of the large-curve side support 322. It should be noted that, for the structural member having a gap (for example, a mesh tube structure and a spiral body structure, in which the mesh tube structure has a mesh-like gap and the spiral body structure has a spiral extending gap), the test method is to spread and lay a test piece (for example, the large curved side support 322 or the small curved side support 323) in a plane, and make the tested material piece not overlap in a direction perpendicular to the plane, measure an area S1 surrounded by an outer contour of the test piece in the spread state, further measure a projected area S2 of the material of the test piece in the plane, and a ratio (S2/S1) of the projected area of the material of the test piece in the plane to the area surrounded by the outer contour is the density.

When only the intensity of two test pieces needs to be compared, and a specific value of the intensity does not need to be measured, the following method can be adopted:

if the two test pieces are spiral bodies, the screw pitches of the two test pieces can be compared, the screw pitches are large, the density degree is small, and the screw pitches are small, and the density degree is large; if the two test pieces are in a grid structure, the size and the number of the mesh holes of the two test pieces can be compared to judge the relation of the density degree of the two test pieces, and the density degree of the mesh holes is small when the mesh holes are large, and the density degree of the mesh holes is large when the mesh holes are small. In this embodiment, the pitch of the small curved side supporting member 323 is larger than that of the large curved side supporting member 322, so that the flexibility of the small curved side supporting member 323 is larger than that of the large curved side supporting member 322, and the first deformation resistance can be further reduced, which is beneficial for the automatic switching of the delivery sheath 20 to the first curved state in the aortic arch 12.

Referring to fig. 6 again, the small curved side support 323 includes, along its length, a first section 3231, a second section 3232 and a third section 3233, where the proximal end of the first section 3231 is connected to the first support structure 311, the second section 3232 is located between the first section 3231 and the third section 3233, the third section 3233 is connected to the distal end of the second section 3232, the flexibility of the first section 3231 is smaller than that of the second section 3232, the flexibility of the third section 3233 is smaller than that of the second section 3232, so that the flexibility of the second section 3232 is better than that of the first section 3231 and the third section 3233, the curvature of the second section 3232 is larger than that of the first section 3231 and the curvature of the third section 3233, so that the distal end of the second section 3232 is tilted in a direction close to the central axis of the blood vessel, and further so that the distal end of the second section 3232 is prevented from bending away from the inner wall of the sheath tube 12 and further away from the inner wall of the aortic arch tube 20 at the distal end of the sheath tube, thereby preventing the distal end of the second section 3232 from entering the inner wall of the aortic arch tube 20.

Specifically, the degree of tightness K1 of the material of the small-curve side support 323 in the first section 3231, the degree of tightness K2 of the material of the small-curve side support 323 in the second section 3232, and the degree of tightness K3 of the material of the small-curve side support 323 in the third section 3233. The material of the small-curve side support 323 is denser in the first section 3231 than in the second section 3232, i.e., K1 > K2, so that the flexibility of the small-curve side support 323 in the first section 3231 is smaller than in the second section 3232. The material of the small-curve side support 323 is denser in the second section 3232 than in the third section 3233, K2 < K3, so that the flexibility of the small-curve side support 323 in the second section 3232 is greater than in the third section 3233.

Specifically, the pitch of the spiral of the small-bend side support 323 is smaller in the first section 3231 than in the second section 3232, so that the material of the small-bend side support 323 is denser in the first section 3231 than in the second section 3232, and further so that the flexibility of the small-bend side support 323 in the first section 3231 is smaller than in the second section 3232. The pitch of the spiral of the small-curve side support 323 in the second section 3232 is smaller than that in the third section 3233, and the material of the small-curve side support 323 in the second section 3232 is denser than that in the third section 3233, so that the flexibility of the small-curve side support 323 in the second section 3232 is greater than that in the third section 3233.

The keel 324 is a continuous structural element along its length, with the keel 324 being less flexible than the large curved side supports 322 and the keel 324 being less flexible than the small curved side supports 323 so that the keel 324 provides axial support strength against buckling of the delivery sheath 20.

The keel 324 is provided with a plurality of hollowed-out holes (not shown) along its length, the maximum width of which is smaller than the width of the keel 324, that is, the hollowed-out holes do not partition the keel 324 in the width direction, so that the radial deformability of the keel 324 can be increased without reducing the axial supporting strength of the keel 324, thereby improving the radial deformability of the delivery sheath 20 (i.e. improving the flexibility of the delivery sheath 20). Thereby avoiding too little flexibility of the delivery sheath 20 to enter the branch vessel 121 as the delivery sheath 20 passes through the aortic arch 12.

The polymer tube 21 includes an inner tube 22 and an outer tube 23 connected in a ring shape.

The inner tube 22 is a lubricating layer, and the material thereof may be PTFE (polytetrafluoroethylene), and the inner tube 22 forms a transport passage, the reinforcing tube 31 is provided on the outer side of the inner tube 22, and the outer tube covers the reinforcing tube 31 and the inner tube 22.

The outer layer tube 23 has good biocompatibility, and the material can be polymer materials such as elastic nylon, polyethylene or thermoplastic polyurethane.

Referring to fig. 8, the outer tube 23 includes a large-bend side outer tube 231 and a small-bend side outer tube 232, where the large-bend side outer tube 231 and the small-bend side outer tube 232 are annularly connected to form a tubular configuration of the outer tube 23 (the tubular configuration refers to a closed annular structure in a radial section of the large-bend side outer tube), and the flexibility of the large-bend side outer tube 231 is smaller than that of the small-bend side outer tube 232, so that the first bending resistance can be reduced, and the delivery sheath 20 can be switched to the first bending state more easily.

Referring to fig. 9, the small-bend side outer tube 322 includes a first outer tube 3221, a second outer tube 3222 and a third outer tube 3223, the first outer tube 3221, the second outer tube 3222 and the third outer tube 3223 are connected along the length direction of the small-bend side outer tube, the first outer tube 3221 is radially overlapped with the first section 3231, the second outer tube 3222 is radially overlapped with the second section 3232, the third outer tube 3223 is radially overlapped with the third section 3233, the flexibility of the first outer tube 3221 is smaller than the flexibility of the second outer tube 3222, the flexibility of the third outer tube 3223 is smaller than the flexibility of the second outer tube 3222, so that the flexibility of the second outer tube 3222 is better than that of the first outer tube 3221 and the third outer tube 3223, the curvature of the second outer tube 3222 is larger than that of the first outer tube 3221 and the curvature of the third outer tube 3223 when the distal end of the delivery sheath 20 is bent, the distal end of the delivery sheath 20 is more beneficial to automatically switching the distal end of the second outer tube 3222 to the delivery sheath 20 to the side of the delivery sheath 20 in a state of the small-bend side portion near the distal end of the delivery tube 121.

The difference in hardness between the first outer tube 3221 and the second outer tube 3222 is only less than 5D, so that the delivery sheath 20 is curved in a rounded shape at the connection between the first outer tube 3221 and the second outer tube 3222 when the delivery sheath 20 is curved, and bending of the delivery sheath 20 at the connection between the first outer tube 3221 and the second outer tube 3222 can be avoided, and push resistance of the delivery sheath 20 in passing through a curved blood vessel (e.g., aortic arch 12) can be reduced. The hardness difference between the second outer tube 3222 and the third outer tube 3223 is only less than 5D, when the delivery sheath 20 is bent and deformed, the delivery sheath 20 is bent in a rounded corner at the connection position between the second outer tube 3222 and the third outer tube 3223, so that bending of the delivery sheath 20 at the connection position between the second outer tube 3222 and the third outer tube 3223 can be avoided, and push resistance of the delivery sheath 20 when passing through a bent blood vessel (such as an aortic arch 12) can be reduced.

An embodiment of the present invention also provides a stent system comprising a vascular stent (not shown) and the delivery sheath 20 described above, the vascular stent being delivered to a desired location through the delivery sheath 20.

Referring to fig. 10, the following description is given to the use of the vascular stent system for treating the vascular disease of the ascending aorta 11:

the first step: puncture and establish a delivery path. Specifically, a small incision is made next to the femoral artery near the groin, and the guidewire 15 is first delivered to the ascending aorta 11 and immobilized.

And a second step of: and (5) conveying the support. Specifically, the proximal end of the guide wire 15 is threaded into the lumen of the guide wire 15 from the distal end of the delivery sheath 20, the delivery sheath 20 can be guided along the guide wire 15 to be sequentially delivered from the femoral artery, the abdominal aorta, the descending aorta 13 and the aortic arch 12 to the ascending aorta 11, when the delivery sheath 20 passes through the aortic arch 12, the delivery sheath 20 can be automatically switched to a first bending state, the distal end of the delivery sheath 20 automatically tilts and keeps a distance from the inner wall of the aortic arch 12, and further the distal end of the delivery sheath 20 is prevented from sliding into the branch vessel 121, and meanwhile, the distal end of the delivery sheath 20 can be prevented from sliding to stab the inner wall of the aortic arch 12. As will be appreciated by those skilled in the art, the stent is loaded into the delivery channel of the delivery sheath 20 prior to delivery of the stent, and the delivery device includes a guidewire 15 lumen disposed coaxially with the delivery channel.

In addition, when the conveyor of the present embodiment is used for conveying a branched vascular stent, the conveying sheath 20 is automatically switched to the first bending state in the aortic arch 12, so that the side of the vascular stent with the branch is automatically aligned and positioned with the side of the aortic arch 12 with the branched blood vessel 121, thereby saving the operation time.

And a third step of: releasing the stent. After the stent is delivered to the desired location, the stent is released from the delivery sheath 20 to isolate the diseased site of the ascending aorta 11.

Fourth step: the guidewire 15 and the delivery device are withdrawn. The delivery device is withdrawn from the body and the guidewire 15 is then withdrawn from the body.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims (8)

1. The conveyer comprises a conveying sheath pipe, wherein the conveying sheath pipe comprises a polymer pipe and a reinforcing pipe arranged in the polymer pipe, and is characterized in that the reinforcing pipe comprises a first pipe section and a second pipe section which are connected along the length direction of the reinforcing pipe, the first pipe section is positioned at the proximal end of the second pipe section, a first supporting structure is arranged in the first pipe section, a second supporting structure is arranged in the second pipe section, the distal end of the first supporting structure is connected with the second supporting structure, and the flexibility of the first supporting structure is smaller than that of the second supporting structure;

the second supporting structure comprises a large-bending side supporting piece and a small-bending side supporting piece which are connected in an annular mode, the large-bending side supporting piece and the small-bending side supporting piece are pipe wall components formed by a spiral body, the screw pitch of the small-bending side supporting piece is larger than that of the large-bending side supporting piece, gaps are formed in the large-bending side supporting piece and the small-bending side supporting piece, the density of materials of the large-bending side supporting piece is larger than that of materials of the small-bending side supporting piece, and the flexibility of the large-bending side supporting piece is smaller than that of the small-bending side supporting piece.

2. The conveyor of claim 1, wherein the stiffening tube further comprises a keel coupled to the major flex side support and/or the minor flex side support, the keel having a flexibility less than that of the major flex side support, the keel having a flexibility less than that of the minor flex side support.

3. The conveyor of claim 2, wherein said keel has a plurality of hollowed-out holes along its length.

4. The conveyor of claim 1, wherein the small curve side support comprises, along its length, a first section, a second section, and a third section connected together, the first section being connected at a proximal end to the first support structure, the second section being located between the first section and the third section, the third section being connected at a distal end to the second section, the first section being less flexible than the second section, the third section being less flexible than the second section.

5. The conveyor of claim 4, wherein the polymeric tube comprises an inner tube and an outer tube, the inner tube forming a delivery channel for the delivery sheath, the reinforcing tube being disposed outside of the inner tube, the outer tube encasing the reinforcing tube and the inner tube.

6. The conveyor of claim 5, wherein the outer tube comprises a large curve side outer tube and a small curve side outer tube connected in a loop, the large curve side outer tube having a flexibility less than the small curve side outer tube.

7. The conveyor of claim 6, wherein the small-bend side outer wrap tube comprises a first outer tube, a second outer tube, and a third outer tube, the first outer tube, the second outer tube, and the third outer tube are connected along a length direction of the small-bend side outer wrap tube, the first outer tube radially overlaps the first section, the second outer tube radially overlaps the second section, the third outer tube radially overlaps the third section, the first outer tube has a flexibility less than the second outer tube, and the third outer tube has a flexibility less than the second outer tube.

8. A stent system comprising a vascular stent and a delivery sheath according to any one of claims 1 to 7, the vascular stent being delivered to a desired location by the delivery device.