CN210009187U - Venous blood vessel support and conveyer thereof - Google Patents

Abstract

A venous blood vessel support and its conveyor, the venous blood vessel support is made up of tubular proximal section, middle section and distal end section connected sequentially, the proximal section and distal end section are made of good metal supported tubular goods of biocompatibility, the middle section is the helical structure formed by waved wire of Z shape, both ends of the helical structure are connected with proximal end section and distal end section separately, and use the same material to make; the conveyor comprises an outer sheath, a conveying sheath, an inner sheath and a positioning guide wire, wherein a developing point is arranged at the top end of the positioning guide wire. The utility model has the advantages that: different segmental structures have different flexibilities, and the structure can well conform to various forms of blood vessels and realize better wall-adhering performance.

Description

Venous blood vessel support and conveyer thereof

Technical Field

The utility model relates to an endovascular prosthesis, in particular to a venous vessel stent which is placed in the iliac vein, the subclavian vein and the central venous vessel of a patient and is mainly used for treating patients with venous compression syndrome and venous thrombosis; the delivery device is used to deliver the venous stent into the vessel of interest.

Background

Venous diseases are common diseases in vascular surgery, particularly deep venous thrombosis and central venous stenosis or occlusion of dialysis patients, and if the two diseases are not treated in time, thrombus easily flows back to the heart, so that serious consequences such as limb swelling or pulmonary embolism are caused. The great reason for the formation of these two diseases is Iliac Vein Compression Syndrome (IVCS) and central vein stenosis and thrombosis, and the incidence rate of iliac vein compression syndrome is up to 20% -34%.

There has been no effective treatment of iliac vein compression. In recent years, with the development of technology, interventional procedures are used, and problems such as vein compression and stenosis are solved by interventional procedures using balloon expansion and stent implantation. The technology has the characteristics of small wound and good effect and is gradually accepted. The stent implantation has a long-term effect compared to balloon dilatation. However, due to the large difference of the anatomical morphology of the blood vessels of patients, few stents can be designed to adapt to the conditions of various cases.

At present, most of domestic vascular stents are designed for treating artery-related diseases, and although a few of vascular stents with proper sizes are applied to veins, the problems of secondary thrombus in the stents and the like also occur. At present, fewer brackets are designed aiming at the structural characteristics of veins in China. The internal self-expandable iliac vein support that can take out (utility model: 201520126120.6 is effective in preventing pulmonary embolism caused by deep venous thrombosis, after the treatment is completed, the stent can be taken out through the jugular vein or the femoral vein to avoid the complication caused by the long-term retention of the stent, the stent is actually a vein filter, because the formation of secondary thrombus in the stent can not be well prevented, the stent can only be implanted in a short period and can not provide long-term support for the iliac vein, and the stent can be taken out in a mode of secondary intervention operation, in addition, CN201610268333.1 discloses a blood vessel stent, a preparation method and application thereof, the support is a cutting support, the structure of the support is a closed-loop straight cylinder, the structure has poor flexibility, the support cannot well conform to the shape of a blood vessel, and the support is not beneficial to adapting to the case of iliac vein blood vessel bending.

None of these above-mentioned iliac vein stents are suitable for restoring the iliac vein blood flow state, increasing blood flow and conforming vessel morphology, and are prone to formation of secondary thrombi within the stent.

In addition, the existing vascular stent transporter comprises a control device, an outer sheath, a delivery sheath, an inner sheath and a guiding head, wherein the tubular outer sheath, the delivery sheath and the inner sheath are coaxially arranged from outside to inside, the front end of the conical guiding head is a small-diameter end, the rear end of the conical guiding head is connected to the proximal end of the inner sheath, and the guiding head is provided with a central hole with the same inner diameter as the inner sheath. When the conveyor is used, the position for releasing the stent is mainly close to the display marks at the two ends of the stent, the display marks are weak because no positioning mechanism is used for positioning, and in the operation process, once the positions of the outer sheath, the conveying sheath and the inner sheath slightly move slightly, the position for placing the stent can be deviated, and if the position of the stent is close to the front (close to the heart end), the front end (close to the heart end) of the stent can block the blood flow of the vein at the other side; if the stent is positioned backwards, the stent is deviated from the lesion part, and the due effect cannot be achieved.

Disclosure of Invention

The utility model aims to provide a vein stent with a conveyor, which is used for solving the problems that the prior art is not suitable for recovering the venous blood flow state, increasing the blood flow volume and conforming the blood vessel shape and is easy to form secondary thrombus in the stent; and the problem that the rack conveyor cannot be accurately positioned.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a venous blood vessel support is characterized by comprising a tubular proximal section, a middle section and a tubular distal section which are connected in sequence, wherein the proximal section and the distal section are made of metal-supported tubes with good biocompatibility, the middle section is a spiral structure formed by Z-shaped wavy metal wires, and two ends of the spiral structure are respectively connected with the proximal section and the distal section and are made of the same material.

A venous blood vessel stent is characterized by being formed by butting tubular proximal sections and middle sections, wherein the middle section is a spiral structure formed by Z-shaped wavy metal wires and is made of metal with good biocompatibility.

A venous blood vessel stent is characterized by being formed by butting tubular middle sections and distal end sections, wherein the middle sections are helical structures formed by Z-shaped wavy metal wires and are made of metals with good biocompatibility.

A conveyor for a venous blood vessel stent comprises an operating device, an outer sheath, a conveying sheath, an inner sheath and a guiding head, wherein the tubular outer sheath, the conveying sheath and the inner sheath are coaxially arranged in sequence from outside to inside; is characterized in that at least three radial raised heads which are uniformly distributed along the circumference and used for restricting the proximal end of the venous stent are arranged at the position 5-10mm away from the rear end of the guide head outside the inner sheath; at least three positioning guide wires which are uniformly distributed along the circumference are arranged between the radial raised head and the guide head, the rear ends of the positioning guide wires are connected with the radial raised head or the inner sheath, the front ends of the positioning guide wires have elastic force bending towards the periphery, and the front ends of the positioning guide wires are provided with positioning round heads; the vein stent is arranged on the periphery of the inner sheath behind the rear end of the radial raised head, and when the vein stent is delivered, the proximal end of the outer sheath abuts against the rear end of the guide head, so that the vein stent and the positioning guide wire are bound in the outer sheath; the outer sheath, the delivery sheath and the sheath are respectively connected with corresponding ends of the operation device; the positioning round head is provided with a developing point capable of being under X-ray.

The utility model has the advantages that: the spiral Z-shaped wave structure of interlude, this structure can promote the compliance performance of support. When the support is in the crooked time, the big camber side of support is stretched, and the Z shape wave structure of support can play axial tension's effect this moment, provides axial resilience force, and the tensile opening angle grow of crest in the wave circle also makes the big camber side of support have more support to cover simultaneously, provides with good adherence performance. The proximal section is provided with a certain inclination angle, so that the proximal end of the proximal section is prevented from obstructing blood flow in the vena cava, and secondary thrombus is prevented from being formed to cause stenosis in the stent. Different segmental structures have different flexibilities, and the structure can well conform to various forms of blood vessels and realize better wall-adhering performance. The utility model discloses a conveyer has increased the location button head of location seal wire and front end, and the location button head relies on location seal wire elasticity can be with the nearly heart end accurate positioning of support, guarantees that the support anchoring can not stretch out in vena cava in branch vein and vena cava open position.

Drawings

FIG. 1 is a schematic view of the overall structure of an embodiment of the three-section structural support of the present invention;

FIG. 2 is a schematic view of an axial expansion of one embodiment of the helical structure of the middle section of FIG. 1;

FIG. 3 is a partially axially expanded structural schematic view of another embodiment of the helical structure of the intermediate section of FIG. 1;

FIG. 4 is an enlarged view taken at A in FIG. 3;

fig. 5 is a schematic view of the above embodiment of the present invention in a bent state;

fig. 6 is a schematic diagram illustrating the shape change of the above embodiment of the present invention in a bending state;

fig. 7 is a schematic view of the installation position of the present invention;

FIG. 8 is a schematic view of the present invention adapted to the extremely curved blood vessel;

FIG. 9 is a schematic overall structure diagram of an embodiment of the two-stage structure of the present invention;

FIG. 10 is a schematic overall structure diagram of another embodiment of the two-stage structure of the present invention;

fig. 11 is a schematic view of the overall structure of the conveying device of the present invention;

FIG. 12 is a schematic view of the axial cross-sectional structure at A in FIG. 11 (the inner sheath is not in an extended state);

FIG. 13 is a schematic view of the structure of FIG. 12 (with the outer sheath moved to the left and still covering the stent) with the inner sheath extended and the positioning guidewire released;

FIG. 14 is a cross-sectional view B-B of FIG. 12;

FIG. 15 is a cross-sectional view C-C of FIG. 13;

FIG. 16 is a schematic view of the structure of FIG. 13 (with the sheath continuing to move to the left and the stent exposed);

FIG. 17 is a schematic view of the structure of FIG. 16 after release of the stent (with the outer sheath moved to the right and the positioning guidewire recoiled);

fig. 18 is a schematic view of the sectional structure of the positioning function of the positioning guide wire placed inside the adjacent part of the iliac vein and the inferior vena cava of the venous stent of the utility model.

Detailed Description

As shown in fig. 1-6, the present invention relates to a vein stent equipped with a delivery device, which is characterized in that the vein stent is composed of a proximal section 130, a middle section 140 and a distal section 150, which are connected in sequence, the proximal section 130 and the distal section 150 are made of a tube material supported by a biocompatible metal, the middle section 140 is a spiral structure formed by a Z-shaped wavy wire 214, and both ends of the spiral structure are connected with the proximal section 130 and the distal section 150, respectively, and are made of the same material. The combined length of the proximal section 130, the intermediate section 140, and the distal section 150 ranges from 5mm to 300 mm.

The ports 110 in the proximal section 130 are angled at an angle a =20-30 °.

The proximal section 130, the middle section 140 and the distal section 150 are generally conical in shape, and the taper of the conical section is matched with the blood vessel shape of the iliac vein adjacent to the inferior vena cava of the human body and the shape of the subclavian vein and the superior vena cava.

The corners of the Z-shaped wavy wire 214 are rounded.

The Z-shaped wavy wires 214 which are arranged at intervals of 1-3 circles of the spiral structure are connected with each other through a connecting rod 213; the maximum dimension of the cross section of the Z-shaped wavy metal wire 214 is 0.1-0.4 mm, and the maximum dimension of the cross section of the connecting rod 213 is 0.1-0.3 mm. The wave crest position 211 corresponds to the wave crest position 211 of the next periodic wave ring, and the middle is connected by a connecting rod 213.

The connecting rods 213 are connected to the corresponding peak positions 211 or the corresponding valley positions 212 between the adjacent zigzag wavy wires 214.

The helical configuration includes a single helix formed by one Z-shaped undulating wire 214, a double or loose helix formed by two Z-shaped undulating wires 214, and a triple helix formed by three Z-shaped undulating wires 214.

The spiral structure of the middle section 140 is shaped by a metal wire or carved by a metal tube; the average internal diameter of the stent is 1-6 mm.

The vascular stent is made of one or more of nickel-titanium alloy, cobalt-chromium alloy, stainless steel, titanium alloy, tantalum alloy, biodegradable metal, biodegradable polymer and magnesium alloy.

The surface of the stent is provided with a coating for reducing the release speed of nickel ions and improving the performance of the stent, and the coating comprises: titanium dioxide (TiO2), titanium nitride (TiN), titanium carbide (TiC, diamond-like carbon (DLC), boron (B), molybdenum (Mo), zirconium (Zr), and biomolecule groups.

The utility model discloses a design the structure of developing the point at the both ends of tubulose support, this structure can get the effect of developing accurate positioning at the support implantation in-process, can be with the accurate implantation of the near-end of support iliac vein opening part. Meanwhile, the four developing points are arranged at the position of the near-end opening, so that the circumferential positioning of the support can be realized, and the accurate positioning of the support can be realized. The developing points are generally made of gold or platinum materials and coated on the surface of the relevant positions.

Fig. 2 is a schematic view of a spiral structure in a stent, the structure has a "Z" shaped wave structure commonly used in the field, and suitable rounded corner structures are arranged at the positions 211 and 212 of wave crests. The main characteristic of the structure is that the "Z" wave is not a combination of independent multiple wave circles, but a spiral structure, fig. 2 is a schematic view of an expanded structure, in which a1 and a2, b1 and b2, c1 and c2, d1 and d2, e1 and e2, f1 and f2, g1 and g2, and h1 and h2 are connection points, which are connected in sequence. Are combined into a tubular Z-shaped wave structure.

As shown in fig. 4, the stent wave turns are helical, rising by one pitch after one wave turn. The wave crest position 211 corresponds to the wave crest position 211 of the next periodic wave ring, and the middle is connected by a connecting rod 213. The width, the thickness or the diameter of the thin rod piece forming the wave ring structure can be preferably 0.1-0.4 mm. The connecting rod 213 has a rod width (or a thickness or a diameter of 0.1-0.3 mm preferably).

Referring to fig. 7 and 8, the above-described embodiment of the present invention is applied to an iliac vein 102 placed within the vicinity of the inferior vena cava 101 (at the intersection with another iliac vein 103). The stent 1 is placed into the iliac vein with the port 110 of the proximal section 130 of the stent placed at the junction 1012 of the iliac vein vessel 102 and the inferior vena cava. As shown in figure 8, when the iliac vein 102 is in the extreme configuration shown in the figure, the proximal end of the stent 1 (the bevel 110 is positioned at the intersection 1012 of the iliac vein 102 and the inferior vena cava, the stent is not easy to shift and fall after the proximal section 150 of the stent is anchored to the blood vessel, the middle section 140 of the stent has the bending configuration with good flexibility and adaptability to the blood vessel, and the stent can still be attached to the blood vessel wall under the condition that the blood vessel is bent.

The stent is placed in the iliac vein 102 in a blood vessel, wherein the iliac vein 102 has different bending angles in practice, and in order to adapt to the use under the slightly complex condition, the middle 140 of the stent is provided with a spiral structure with better flexibility, and the spiral structure can have larger bending and can adapt to various blood vessel shapes. The proximal end is provided with an anchoring section with stronger radial supporting force (the proximal end section 130 can be well anchored with the vessel wall after being implanted into the vessel, and stronger support force and anchoring force are provided for the stent.

The spiral structure of the middle section 140 of the present invention includes a single spiral, a double spiral, a triple spiral structure or a multiple spiral structure.

As shown in FIG. 5, when the stent is in a curved state, the proximal section 130 may remain straight and the more flexible intermediate section 140 may be in a curved state.

As shown in FIG. 6, the large curved side of the mid-section 140 of the stent is stretched in the direction of the arrow 10 as shown, with the gap u1 between the two nodes increasing, the angle u3 between the peaks increasing, and the loop height u2 decreasing. The crest can bear certain axial tension this moment, can disperse axial tension and axial length variation, reduces the support wave circle because the crooked problem of support and the great condition in interval between two sections wave circles that leads to, influences the good laminating of support and vascular wall. Conversely, when the stent is bent, the inner stent is compressed in the direction indicated by the arrow 10 in the figure, and the gap u1 between the two nodes of the wave ring is reduced, the included angle u3 between the wave crests is increased, and the wave ring height u2 is reduced. At the moment, the wave crest can bear certain axial pressure, the axial pressure and the axial length reduction can be dispersed, and the phenomenon that two sections of wave rings of the bracket are attached again due to the bending problem of the bracket is reduced, so that the wave crest of the bracket protrudes into the bracket.

The stent is placed in an iliac vein vessel 102 in a blood vessel, wherein the iliac vein 102 and the inguinal ligament have different bending and supporting force requirements, and two-section type structural stents with different flexibility and supporting force are designed to adapt to the use under the slightly complicated condition as shown in fig. 9 and 10. Fig. 9 is composed of a tubular proximal section 130 and a middle section 140, which are butted together, wherein the proximal section 130 is provided as an anchoring section with stronger radial supporting force to adapt to the anatomical features of the iliac vein compression site. Fig. 10 is comprised of a tubular intermediate section 140 and a distal section 150 in abutting engagement, the distal section 150 being configured as an anchor section with increased radial support to accommodate the anatomical features of the groin section. The intermediate section 140 in fig. 9 and 10 is the same as the three-section structure embodiment described above.

Because the blood in the venous blood vessel flows at a slower speed than the arterial blood vessel, the stent in the venous blood vessel needs to have more capability of resisting thrombosis, and in order to reduce the release of nickel element harmful to human body in nickel-titanium alloy, the stent can be preferably added with a surface coating (with or without coating), wherein the surface coating is titanium dioxide (TiO2), titanium nitride (TiN), titanium carbide (TiC diamond-like carbon film (DLC), boron (B), molybdenum (Mo), zirconium (Zr), biomolecular groups and the like.

Referring to fig. 11-18, the present invention relates to a conveyor for venous stents, which comprises an outer sheath 2, a conveying sheath 3, an inner sheath 4 and a guiding head 8, wherein the tubular outer sheath 2, conveying sheath 3 and inner sheath 4 are coaxially arranged from outside to inside in sequence, the front end of the conical guiding head 8 is a small diameter end, the rear end of the conical guiding head is connected to the proximal end of the inner sheath 4, and the guiding head 8 is provided with a central hole having the same inner diameter as the inner sheath 4. The above structure is prior art. Is characterized in that at least three radial raised heads 7 which are uniformly distributed along the circumference and used for restricting the proximal end of the venous stent 1 are arranged at the position 5-10mm away from the rear end of the guide head 8 outside the inner sheath 4; at least three positioning guide wires 5 which are uniformly distributed along the circumference are arranged between the radial raised head 7 and the guide head 8, the rear end of each positioning guide wire 5 is connected with the radial raised head 7 or the inner sheath 4, the front end of each positioning guide wire 5 has elastic force bending towards the periphery, the front end of each positioning guide wire 5 is provided with a positioning round head 51, each positioning guide wire 5 has elasticity and radian, and the positioning round heads 51 at the top ends of the positioning guide wires have developing points under X-rays made of materials such as platinum and the like; the vein stent 1 is arranged on the periphery of the inner sheath 4 behind the rear end of the radial raised head 7, when the vein stent 1 is delivered, the proximal end of the outer sheath 2 is abutted against the rear end of the guide head 8, and the vein stent 1 and the positioning guide wire 5 are restrained in the outer sheath 2; the outer sheath 2, the delivery sheath 3 and the sheath 4 are respectively connected with the corresponding ends of the operation device.

The operation device may be any of the prior art, and an embodiment thereof is shown in fig. 11, which includes: the sheath comprises a conveying sheath handle 8, a locking knob 9 and a sheath handle 10, wherein the front end of the sheath handle 10 is connected with the far end of the sheath 2; the distal end of the delivery sheath 3 passes through the outer sheath handle 10 and is connected with the front end of the delivery sheath handle 8, and the axial line of the delivery sheath handle 8 is provided with an axial hole for passing a guide wire; a locking knob 9 for locking the delivery sheath 3 is arranged at the rear end of the sheath handle 10; the sheath handle 10 is provided with a port 11 for injecting a cleaning liquid.

When the conveyer of the utility model is used (taking the part of the vein stent 1 which is arranged in the iliac vein 102 and adjacent to the inferior vena cava 101 as an example as shown in fig. 18), the conveying process is as follows:

1. delivering the venous vessel stent 1 to a predetermined position of the venous vessel: the conveyor initially takes the venous stent 1 to be conveyed between the outer sheath 2 and the inner sheath 4 (see fig. 12), the two ends of the venous stent 1 are positioned between the rear end of the radial raised head 7 and the proximal end of the conveying sheath 3, and the whole body shown in fig. 12 is conveyed to the blood vessel to be supported along the guide wire 9 inserted into the blood vessel in advance (the guide wire 9 penetrates into the hole of the inner sheath 4 of the conveyor of the invention) (as shown in fig. 18).

2. Releasing the positioning guide wire 5: then the outer sheath 2 is withdrawn for the first time (to the position shown in fig. 13) through the operating device, the positioning guide wires 5 are released, the positioning round heads 51 (developing points) at the front ends of the positioning guide wires 5 are bent outwards and abut against the inner wall (shown in fig. 18) of the other iliac vein vessel 103 adjacent to the iliac vein vessel 102, the positioning round heads 51 (developing points) at the top ends of the positioning guide wires 5 can be attached to the blood vessel opening to play a role in positioning the blood vessel opening, and the three developing points can form a plane to display the position of the blood vessel opening.

The inner sheath 4 can be withdrawn slightly, the positioning guide wire 5 is close to the vessel wall, the venous blood vessel support 1 is pushed forwards through the delivery sheath 3 (at the moment, the locking knob 9 needs to be loosened, the delivery sheath 3 can move in the outer sheath handle 10, and the locking knob 9 is tightened after adjustment), so that the accurate positioning of the venous blood vessel support 1 is ensured.

3. Release of venous stent 1: next, the outer sheath 2 is withdrawn for the second time so that the proximal end thereof is at the same position as the proximal end of the delivery sheath 3 (to the position shown in fig. 16), and the venous stent 1 is self-expandable, and is expanded and fixed to the inner wall of the blood vessel after the restraint of the outer sheath 2 is released.

4. Binding and positioning guide wire 5: the sheath 2 is advanced until the positioning guidewire 5 is captured within the sheath 2 (as shown in figure 17), ready for complete withdrawal of the conveyor.

5. Withdrawing the conveyor and guidewire: the outer sheath 2, the delivery sheath 3, the inner sheath 4 and the positioning guidewire 5 are then withdrawn together from the vessel.

Claims (15)

1. A venous blood vessel support is characterized by comprising a tubular proximal section (130), a middle section (140) and a tubular distal section (150) which are connected in sequence, wherein the proximal section (130) and the distal section (150) are made of metal-supported tubes with good biocompatibility, the middle section (140) is a spiral structure formed by Z-shaped wavy metal wires (214), and two ends of the spiral structure are respectively connected with the proximal section (130) and the distal section (150) and are made of the same material.

2. The venous vessel stent according to claim 1, characterized in that the port at the proximal section (130) is an inclined plane inclined at an angle a =10-80 °.

3. The venous stent of claim 1, wherein the proximal section (130), the intermediate section (140) and the distal section (150) are generally conical in shape, with a taper conforming to the vessel shape of the iliac or subclavian vein of the body adjacent to the vena cava, and a taper in the range of 6-35mm in major diameter and 2-25mm in minor diameter.

4. The venous stent of claim 1, wherein the corners of the zigzag-shaped undulating wire (214) are rounded.

5. The venous stent according to claim 1, characterized in that the zigzag-shaped wavy wires (214) of the helical structure are connected with each other by a connecting rod (213) between every 1-3 weeks apart; the maximum dimension of the cross section of the Z-shaped wavy metal wire (214) is 0.1-0.6 mm, and the maximum dimension of the cross section of the connecting rod (213) is 0.1-0.5 mm; the wave crest position (211) corresponds to the wave crest position (211) of the next periodic wave ring, and the middle is connected by a connecting rod (213).

6. The venous vessel stent according to claim 5, characterized in that the connecting rods (213) are connected at corresponding peak positions (211) or corresponding valley positions (212) between adjacent zigzag-shaped wavy wires (214).

7. The venous stent of claim 1, wherein the helical structure comprises a single helix formed by one Z-shaped undulating wire (214), a double or loose helix formed by two Z-shaped undulating wires (214), and a triple helix formed by three Z-shaped undulating wires (214).

8. Venous vessel support according to claim 1, characterized in that the helical structure of the intermediate section (140) is shaped from a wire or carved from a metal tube; the stent has an average inner diameter of 1 to 25mm, and the inner diameters of the proximal section (130) and the distal section (150) are 1 to 30 mm.

9. The venous stent of claim 1, wherein the material of the stent is one or more of nickel-titanium alloy, cobalt-chromium alloy, stainless steel, titanium alloy, tantalum alloy, biodegradable metal, biodegradable polymer and magnesium alloy; the combined length of the proximal section (130), the intermediate section (140) and the distal section (150) ranges from 1mm to 300 mm.

10. The venous stent of claim 1, wherein a coating layer for reducing the release rate of nickel ions and improving the stent performance is provided on the stent surface, the coating layer comprising: titanium dioxide, titanium nitride, titanium carbide, diamond-like films, boron, molybdenum, zirconium, and biomolecule groups.

11. The venous stent according to claim 1, characterized in that visualization points are provided on the vessel wall at both ends of the venous stent.

12. A venous blood vessel support is characterized by being formed by butt joint of a tubular proximal section (130) and a middle section (140), wherein the middle section (140) is a spiral structure formed by Z-shaped wavy wires (214) and is made of metal with good biocompatibility.

13. A venous blood vessel support is characterized by being formed by butt joint of a tubular middle section (140) and a tubular distal end section (150), wherein the middle section (140) is a spiral structure formed by Z-shaped wavy metal wires (214) and is made of metal with good biocompatibility.

14. A conveyor of venous stents according to any of the claims 1, 12 and 13, comprising a manipulator device, an outer sheath (2), a delivery sheath (3), an inner sheath (4) and a guiding head (8), wherein the tubular outer sheath (2), the delivery sheath (3) and the inner sheath (4) are coaxially arranged from outside to inside, the front end of the conical guiding head (8) is a small-diameter end, the rear end of the conical guiding head is connected with the proximal end of the inner sheath (4), and the guiding head (8) is provided with a central hole with the same inner diameter as the inner sheath (4); is characterized in that at least three radial raised heads (7) which are uniformly distributed along the circumference and used for restricting the heart-near end of the venous stent (1) are arranged at the position 5-10mm away from the rear end of the guide head (8) outside the inner sheath (4); at least three positioning guide wires (5) which are uniformly distributed along the circumference are arranged between the radial raised head (7) and the guide head (8), the rear end of each positioning guide wire (5) is connected with the radial raised head (7) or the inner sheath (4), the front end of each positioning guide wire (5) has elastic force bending towards the periphery, and the front end of each positioning guide wire (5) is provided with a positioning round head (51); the vein stent (1) is arranged on the periphery of the inner sheath (4) behind the rear end of the radial raised head (7), and when the vein stent (1) is delivered, the proximal end of the outer sheath (2) is abutted against the rear end of the guide head (8), so that the vein stent (1) and the positioning guide wire (5) are bound in the outer sheath (2); the outer sheath (2), the conveying sheath (3) and the sheath (4) are respectively connected with the corresponding ends of the operating station device; the positioning round head (51) is provided with a developing point capable of being under X-ray.

15. A carrier for a venous stent as claimed in claim 14, wherein the operating means comprises: the sheath comprises a conveying sheath handle (8), a locking knob (9) and a sheath handle (10), wherein the front end of the sheath handle (10) is connected with the far end of the sheath (2); the distal end of the delivery sheath (3) passes through the outer sheath handle (10) and is connected with the front end of the delivery sheath handle (8), and an axial hole for passing a guide wire is formed in the axial line of the delivery sheath handle (8); the rear end of the sheath handle (10) is provided with a locking knob (9) for locking the delivery sheath (3); the sheath handle (10) is provided with an interface (11) for injecting a cleaning liquid.

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