38 results about "Iliac veins" patented technology

The invention discloses a filter capable of recycling thrombi. The filter is placed at the postcava position between a renal vein and an iliac vein through an interventional method, and lower limb thrombi can be prevented from going upwards to enter the lungs to cause pulmonary embolism. The filter capable of recycling the thrombi is characterized in that the two-layer filter screen design is adopted, the two-layer filter screen design comprises a near-end screen, a far-end screen and supporting rods which are connected between the near-end screen and the far-end screen, and the supporting rods adopt the internal concave type design; the internal concave design comprises internal concave portions and near-end points and far-end points which are connected to the upper sides and the lower sides of the internal concave portions, the near-end points and the far-end points are attached to the inner wall of a blood vessel to play a role in supporting the blood vessel, anchor thorns are arranged on the near-end points to play a fixing role, and the filter is prevented from being displaced under scouring of blood. According to the filter capable of recycling the thrombi, the thrombus filtering effect is good, locating can be repeatedly performed, fixing is stable, and the implanting time can be prolonged.

A method of diagnosing an obstructive lesion in the iliac venous system. The method includes the steps of identifying the presence of chronic venous disease from clinical evaluation alone of a patient, and without any further evaluation, undertaking an IVUS procedure on the patient to identify any non-thrombotic or thrombotic iliac vein lesions.

The invention relates to an intravascular stent and a preparation method and application thereof. The intravascular stent comprises a positioning section and a supporting section, the positioning section comprises a plurality of first repeat single parts, the supporting section comprises at least two supporting units and at least one connection unit, each supporting unit comprises a plurality of second repeat single parts, the first repeat single parts are not as many as the second repeat single parts, and a plane formed by the front ends of the first repeat single parts are perpendicular to the axis of the intravascular stent. The intravascular stent is especially applicable to iliac veins, effective in iliac vein supporting, less in harms to vein walls and capable of effectively avoiding formation of secondary thrombi in the implanted intravascular stent. In addition, the intravascular stent is capable of well positioning in the iliac veins, release accuracy is improved, and convenience in operation is achieved. Furthermore, the intravascular stent is simple in structure, convenient to produce and low in cost, thereby having important practical significances and promising clinical application prospect.

A filter device for capturing thrombi in a body vessel of a patient is disclosed. The device comprises first and second portions, each comprising a wire formed into a zig-zag configuration. The configuration comprises a series of straight sections and a plurality of bends connected to the straight sections. The straight sections are joined by the bends, defining a first cell size of the first portion and a second cell size of the second portion. The filter device further comprises a filter portion connected to the first and second portions. The filter portion comprises the wire formed into a zig-zag configuration having a series of straight sections and a plurality of bends connected to the straight sections. The straight sections of the filter portion are joined by the bends of the filter portion, defining a filter cell size of the filter portion. The filter portion is configured to be disposed at the arc of the iliac veins at the opening of the inferior vena cava.

The invention provides a filtering device. The filtering device includes a net tubular support structure ad at least one internal filtering structure connected to the support structure; each internal filtering structure and the support structure at least partly overlap in the axial direction; each internal filtering structure includes a plurality of support rods; and first ends of all the support rods are connected together, and second ends of the all the support rods are connected to the support structure. Each internal filtering structure and the support structure at least partly overlap in the axial direction, and then the length of the filtering device is shortened in the axial direction, influence on dual side renal vein and iliac vein blood return due to a too long filtering structure can be avoided, and the efficiency of thrombus capturing can be improved; and meantime, the support structure is net tubular and adopts an appropriate specification, and provide strong support force for the internal filtering structures, and then eccentric tops of the internal filtering structure can be avoided, the accuracy of the filtering device can be improved after the filtering device is released, and the efficiency of thrombus capturing can be further improved.

The invention relates to the technical field of medical instruments for interventional operations and particularly discloses a self-expandable stent suitable for supporting of a narrow lumen and a preparation method and application thereof. The self-expandable stent adopts the supporting structure that a single-spiral segment and a double-spiral segment are simultaneously designed on a single stent, and connecting members having different structures are circumferentially designed in the single-spiral segment and the double-spiral segment, so that the stent has different flexibility and crushing resistance in the two segments. The technical problem can be solved that the performance of a stent in the prior art cannot fully satisfy iliac vein implantation, and the stent has higher safety andis especially suitable for the treatment of iliac vein stenosis.

An intravascular stent, preparation method and use thereof. The intravascular stent includes a positioning segment and a supporting segment. The positioning segment includes a plurality of first repeating elements. The supporting segment includes at least two supporting units and at least one connecting unit. The supporting unit includes a plurality of second repeating elements. The number of the first repeating elements differing from the number of the second repeating elements. A plane formed by front ends of the plurality of first repeating elements being vertical to or intersecting with the axis of the intravascular stent. The intravascular stent is usable for iliac vein, with good supporting effect for iliac vein and less damage to venous wall, and can effectively avoid forming in-stent secondary thrombosis after intravascular stent implantation. Moreover, the intravascular stent is positionable in the iliac vein to improve the accuracy of the release.

The invention belongs to the technical field of medical instruments, and particularly relates to a flexible iliac vein stent capable of being positioned accurately. The stent comprises a stent front section and a stent rear section. The stent front section and the stent rear section are made of metal materials, and the stent front section is a laser engraving tapered mesh tube structure, the length of the stent front section is a=4 cm, the surface where a front opening is formed of the stent front section is a sloped surface, the angle of inclination is 20 degrees <=gamma <=30degrees, the stent rear section is a woven mesh tube structure, the length of the stent rear section is 4 cm <=b <=20 cm, the rear end of the stent front section overlaps with the front end of the stent rear section,the overlapping length size is c=1 cm, and overlapping portions of the stent front section and the stent rear section are welded together. The stent can not only be accurately positioned and placed inthe opening of a common iliac vein without influence on the blood flow of a contralateral iliac vein, but also have good flexibility to reduce the occurrence of thrombus, and a long-term unobstructedstate of the stent is maintained.

The invention relates to a vascular stent, a method for preparing the same and application of the vascular stent. The vascular stent comprises a positioning zone and a supporting zone. The positioning zone comprises a plurality of first repeat monomers, the supporting zone comprises at least two supporting units and at least one connecting unit, each supporting unit comprises a plurality of second repeat monomers, the quantity of the first repeat monomers is different from that of the second repeat monomers, and the second repeat monomers in each of the supporting units positioned at the front end and the rear end of the supporting zone are connected with the second supporting monomers in the other corresponding adjacent supporting unit by a first connecting unit in a one-to-one correspondence manner to form closed-loop structures. The vascular stent, the method and the application have the advantages that the vascular stent is particularly applicable to iliac veins, and good iliac vein supporting effects can be realized by the vascular stent; venous walls rarely can be injured, and stent secondary thrombosis after the vascular stent is implanted can be effectively prevented; the vascular stent can be effectively positioned in the iliac veins and is easy and convenient to operate, and the release accuracy can be improved.

The invention relates to an intravascular stent and a preparation method and application thereof. The intravascular stent comprises a positioning section and a supporting section. The positioning section comprises a plurality of first repetition single bodies. The supporting section comprises at least two supporting units and at least one first connecting unit. The supporting units comprise a plurality of second repetition single bodies. The number of the first repetition single bodies is different from the number of the second repetition single bodies. A plane formed by the front end parts of the first repetition single bodies intersects with the axis of the intravascular stent. The intravascular stent is especially suitable for the iliac vein and good in supporting effect for the iliac vein, hurt to the vein wall is slight, and secondary thrombus formed in the stent after the intravascular stent is implanted can be effectively avoided. In addition, the intravascular stent can be positioned very well in the iliac vein, releasing accuracy is improved, and operation is easy and convenient. The intravascular stent is simple in structure, convenient to produce and low in cost and accordingly has important practical significance and good clinical application prospects.

The invention discloses iliac vein lateral forceps for a urinary and proctology department. The iliac vein lateral forceps comprise a bent head, a lateral plate, a first forceps handle, a second forceps handle and solid aluminum alloy flexible pipes, wherein a first finger ring is arranged at one end of the first forceps handle, a first forceps head is arranged at the other end of the first forceps handle, the first forceps handle and the first forceps head are fixedly connected through the solid aluminum alloy flexible pipe, a lateral plate is further arranged on one side of the first forcepshandle and one side of the first forceps head, a second finger ring is arranged at one end of the second forceps handle, and a second forceps head is arranged at the other end of the second forceps handle. According to the iliac vein lateral forceps disclosed by the invention, the forceps heads and the forceps handles are connected through the solid aluminum alloy flexible pipes; furthermore, thelateral plate is arranged on the sides of the forceps heads and the sides of the forceps handles, and the two ends of the lateral plate are respectively in rotary connection with the forceps heads and the forceps handles through pin shafts; thus, the use of the lateral forceps has certain strength, and angle adjustment among the forceps handles and the forceps heads is not affected. Therefore, the iliac vein lateral forceps disclosed by the invention is suitable for operations at different positions and has the advantage of more simpleness and more convenience in use.

Apparatus and methods are provided for treating patients exhibiting symptoms of hypertension, isolated systolic hypertension, heart failure with preserved ejection fraction, May-Thuner Syndrome or dyspnea by diagnosing and reducing narrowing of a patient's iliac vein caused by extrinsic localized compression using a stent having circumferential differential radial stiffness and delivery catheter for aligning and deploying such stents.

The invention discloses a blood vessel dilation stent, and belongs to the technical field of blood vessel dilation stents. The blood vessel dilation stent is composed of a mesh cylinder and a supporting part, wherein the mesh cylinder is composed of a vena cava mesh cylinder and an iliac vein mesh cylinder which are mutually connected, the supporting part is arranged at one end of the vena cava mesh cylinder, the other end of the vena cava mesh cylinder is connected with the iliac vein mesh cylinder, the outer diameter of the vena cava mesh cylinder is larger than the inner diameter of vena cava by 0.1-8 mm, the outer diameter of the iliac vein mesh cylinder is larger than the inner diameter of each iliac vein by 0.1-8 mm, the vena cava mesh cylinder and the iliac vein mesh cylinder are placed in the vena cava and the iliac vein on one side respectively, a blood opening is formed in the joint of the vena cava mesh cylinder and the iliac vein mesh cylinder, and the blood opening communicates with the iliac vein on the other side. The mesh cylinder is composed of the vena cava mesh cylinder and the iliac vein mesh cylinder which are mutually connected, and due to the fact that the vena cava is not liable to move, the vena cava mesh cylinder and the supporting part are placed in the vena cava for fixation so that displacement, caused by human motion, of the blood vessel stent canbe prevented, effects of the blood vessel stent can be maintained for a long time, and the service life of the blood vessel stent is prolonged.

A filter device for capturing thrombi in a body vessel of a patient is disclosed. The device comprises first and second portions, each comprising a wire forming a zig-zag configuration. The configuration comprises a series of straight sections and a plurality of bends connected to the straight sections. The straight sections are joined by the bends, defining a first cell size and a second cell size. The filter device further comprises a filter portion connected to the first and second portions. The filter portion comprises the wire forming a zig-zag configuration having a series of straight sections and a plurality of bends connected to the straight sections. The straight sections of the filter portion are joined by the bends of the filter portion, defining a filter cell size. The filter portion is disposed at the arc of the iliac veins at opening of the inferior vena cava.

The invention provides an iliac vein stent and belongs to the technical field of medical instruments. The iliac vein stent is of an annular structure; the iliac vein stent sequentially comprises a first supporting region, a second supporting region and a third supporting region in the axial direction, which are adjacently arranged; the second supporting region is suitable for being supported at the lesion position of the iliac vein; and the supporting force of the first supporting region and the supporting force of the third supporting region are both smaller than the supporting force of the second supporting region. According to the iliac vein stent disclosed by the invention, large compression cannot be caused to iliac vein vascular endothelial tissues, damage of the stent to vascular endothelial cells can be reduced, and finally, the aims of reducing restenosis, deep vein thrombosis and other complications after stent implantation and improving the clinical treatment effect are fulfilled.

The invention provides a liensinine rectal administration suppository and a preparation method and a purpose thereof. The liensinine rectal administration suppository comprises liensinine, a fat-soluble suppository matrix and a surface active agent. The invention also provides the purpose of the liensinine suppository for preparing an anti-arrhythmia or anti-hypertension drug. The liensinine rectal administration suppository provided by the invention has the advantages that the low bioavailability caused by poor oral absorbing of the liensinine and severe first-pass effect of liver is avoided; the drug passes through inferior rectal veins and anus veins, bypasses the liver via internal iliac veins, enters inferior vena cava, and then enters large circulation, so as to realize the anti-arrhythmia or anti-hypertension function.

The present disclosure relates to an intravascular stent, preparation method and use thereof, and the intravascular stent comprises a positioning segment and a supporting segment, the positioning segment comprising a plurality of first repeating elements, the supporting segment comprising at least two supporting units and at least one connecting unit, the supporting unit comprising a plurality of second repeating elements, the number of the first repeating elements differing from the number of the second repeating elements, a plane formed by front ends of the plurality of first repeating elements being vertical to or intersecting with the axis of the intravascular stent. The intravascular stent of the present disclosure is particularly suitable for iliac vein, with good supporting effect for iliac vein and less damage to venous wall, and can effectively avoid forming in-stent secondary thrombosis after intravascular stent implantation. Moreover, the intravascular stent of the present disclosure can be well positioned in the iliac vein to improve the accuracy of the release, and it is simple for operation. The vascular stent of the present disclosure has the advantages of simple structure, convenient production and low cost, and thereby has important practical significance and good prospect in clinical application.

The invention relates to the technical field of medical instruments for interventional operations and particularly discloses a self-expandable stent suitable for supporting of a narrow lumen and a preparation method and application thereof. The self-expandable stent adopts the supporting structure that a single-spiral segment and a double-spiral segment are simultaneously designed on a single stent, and connecting members having different structures are circumferentially designed in the single-spiral segment and the double-spiral segment, so that the stent has different flexibility and crushing resistance in the two segments. The technical problem can be solved that the performance of a stent in the prior art cannot fully satisfy iliac vein implantation, and the stent has higher safety andis especially suitable for the treatment of iliac vein stenosis.

A method for creating a rat testis transplantation model includes cutting off the blood vessels of left testis including the left arteria spermatica, left vena spermatica, and the abdominal aorta andleft iliac vein, ligating the far end of left iliac vein, sleeving Cuff tubes to another three broken ends, annular ligation, embedding them in incised abdominal aorta and left iliac vein of receptorrat, and removing both testes of receptor rat. Its advantages are simple operation, high successful rate, and high reliability.

The invention discloses a split-type iliac vein stent and a placement method thereof.The split-type iliac vein stent comprises a lesion vein far-end section and a lesion vein near-end section which are located in a lesion vein and connected with each other and a lesion vein opposite-side section located in another iliac total vein, a connecting part is arranged at one end of the lesion vein far-end section, a first developing point is arranged on the connecting part, and a second developing point is arranged at the other end of the lesion vein near-end section; the lesion vein far-end section is connected with one end of the lesion vein opposite-side section through the connecting part, the lesion vein opposite-side section and the lesion vein far-end section form an inverted V shape at the convergence position of the two iliac total veins, and the lesion vein and the opposite side of the lesion vein are connected in a separated mode, so that the lesion vein and the opposite side of the lesion vein can be connected in the blood flowing direction. The stent is split at the intersection of the left and right iliac general veins to form a V-shaped structure, so that the stent is matched with the special form of the convergence position of the left and right iliac general veins to avoid displacement, the stent cannot enter the inferior vena cava, and the mode is convenient for medical staff to position and place and easy to operate.

A method of determination of a cause of hemorrhoids in a subject includes a determination of the presence of hemorrhoids in the subject by visual inspection, and by one or more of a non-invasive medical imaging procedure and / or an intra-vascular visualization procedure, determining if there is an obstruction or occlusion in an iliac vein of the subject, and if so, determining that the hemorrhoids were caused by such obstruction or occlusion. If the obstruction or occlusion are determined to be the cause of the hemorrhoids, a procedure for compressing the obstruction or occlusion in the iliac vein of the subject, such as by angioplasty or stenting, is performed. After an appropriate time period, changes to the hemorrhoids in the subject are determined by a subsequent visual inspection.

The invention discloses iliac vein side wall forceps for the urology anorectal surgical department. The forceps comprise a cylindrical head, wherein one end of the cylindrical head is coaxially connected with a hemispherical mounting seat, the other end of the cylindrical head is coaxially connected with a supporting rod, and the diameter of the hemispherical mounting seat is equal to that of thecylindrical head; the diameter of the cylindrical head is larger than that of the supporting rod, so that the section between the cylindrical head and the supporting rod is stepped; second mounting grooves which are symmetrically arranged and reach deep into the surface of the supporting rod are formed in the hemispherical mounting seat, fourth mounting grooves which are symmetrically arranged andreach deep into the surface of the supporting rod are formed in the cylindrical head, and the fourth mounting grooves correspond to and communicate with the second mounting grooves respectively; anda connecting seat is rotationally mounted in each second mounting groove by a rotating shaft. During use, a handle can be held by hand, a drive motor can be controlled to rotate forward and backward to control opening and closing of the forceps, time and effort are saved, and usage is convenient.

A dual balloon catheter having two independently inflatable balloons that provides complete or intermittent synchronous occlusion of blood vessels (such as the contralateral iliac veins, for example) via the balloons, which can be used for the purpose of decreasing the pressure in the inferior vena cava, which results in decongestion of the kidneys, liver / splanchnic compartment, lymphatic system, and the heart.

The invention relates to the technical field of an implantable medical device, and especially relates to a bracket with an oblique marker and its application, a system and a method for adjusting the oblique direction of the bracket thereof. A special marker combination is arranged at an oblique mouth of the bracket, the oblique direction of the bracket can be quickly and accurately determined by asurgeon through a two-dimensional projection plane image of the marker combination, the time for adjusting the oblique direction of the bracket can be shortened for the surgeon, and the difficulty ofadjustment is reduced. The bracket of the present invention can be used as the self-expanding bracket for the position of the iliac vein lesion, and form the bracket system with a catheter having a directional marker for indicating the oblique direction of the bracket.

Apparatus and methods are provided for treating patients exhibiting symptoms of hypertension, isolated systolic hypertension, heart failure with preserved ejection fraction, May-Thuner Syndrome or dyspnea by diagnosing and reducing narrowing of a patient's iliac vein caused by extrinsic localized compression using a stent having circumferential differential radial stiffness and delivery catheter for aligning and deploying such stents.

The invention relates to the technical field of medical apparatuses, in particular to an iliac vein stent. The iliac vein stent comprises a proximal end part, an intermediate part and a distal end part, which are sequentially connected, wherein the proximal end part and the distal end part are degradable stents, and the intermediate part is a permanent stent. According to the iliac vein stent disclosed by the invention, the proximal end part and the distal end part are the degradable stents and can be completely absorbed or degraded within 6 weeks, and residues are not generated; after the distal end part is absorbed, intrinsic elasticity and bending of blood vessels can be recovered; besides, after the proximal end part in inferior caval veins is absorbed, influence on blood flow of the inferior caval veins and contralateral iliac veins is reduced; the intermediate part is the permanent stent, an intima can spread to cover the intermediate part, so that the shorter the stent is, the shorter the time allowing intima to completely cover the stent is, and the intermediate part of the stent can be stably entrapped under the intima without shifting or coming off; and besides, the intima is smooth, so that the risk of forming thrombosis can be reduced, and the treatment time for resisting coagulation and platelets is correspondingly shortened to 6 weeks.