CN215135646U

CN215135646U - Support system

Info

Publication number: CN215135646U
Application number: CN202022858737.0U
Authority: CN
Inventors: 王金耀; 朱清; 段志邦; 张军利
Original assignee: Shanghai Minimally Invasive Heart Pulse Medical Technology Group Co Ltd
Current assignee: Shanghai Tuomai Medical Technology Co ltd
Priority date: 2020-12-02
Filing date: 2020-12-02
Publication date: 2021-12-14
Anticipated expiration: 2030-12-02

Abstract

The utility model provides a support system, including support piece, inner tube and outer tube, support piece's distal end and near-end are fixed mutually with inner tube and outer tube respectively, and the inner tube has the seal wire chamber, and the seal wire that passes the seal wire chamber can stretch out from support piece's distal end, and the outside of inner tube is located to outer tube activity ground cover, and when the relative outer tube of inner tube moved towards the first direction, support piece extended gradually at least in footpath, when the relative outer tube of inner tube moved towards the second direction, support piece at least upwards shrunk gradually, first direction and second opposite direction. The utility model discloses a braced system utilizes support piece to expand to laminating mutually with the blood vessel when suitable state, for the seal wire provides and supports steadily to avoid the seal wire to take place crooked because of the holding power is not enough, effectively ensure that the CTO pathological change is opened accurately to the seal wire.

Description

Support system

Technical Field

The utility model relates to the technical field of medical equipment, especially, relate to a braced system.

Background

Chronic Total Occlusion (CTO) lesions of lower limb arteries often cause severe ischemia of the lower limbs, even amputation or death, and seriously affect the quality of life of patients. Endoluminal treatment has become the preferred treatment for CTO lesions in the lower extremities, and common endoluminal interventional devices have balloons, stents, volume reduction devices, etc., but the use of these devices is closely related to whether a guide wire can pass through the CTO lesion, and if the guide wire cannot pass through the CTO lesion, further balloon or stent shaping cannot be performed. Thus, whether a guidewire can open a CTO lesion largely determines the success of the treatment.

However, the proximal fibrous cap of CTO lesion is often hard and tough, and requires a large supporting force for opening, but the existing supporting catheter has a weak supporting force, and the guide wire is often bent during opening, so that the CTO lesion cannot be opened.

SUMMERY OF THE UTILITY MODEL

Based on this, the utility model provides a braced system effectively solves the holding power weak and influences the technical problem that the effect of CTO pathological change was opened to the seal wire.

The utility model provides a pair of braced system, include:

a support having opposite distal and proximal ends;

an inner tube secured to the distal end of the support member, the inner tube having a guidewire lumen through which a guidewire can extend from the distal end of the support member;

the outer tube is fixed to the near end of the supporting piece, the outer tube is movably sleeved on the outer side of the inner tube, the length of the outer tube is smaller than that of the inner tube, the far end and the near end of the inner tube are exposed out of the outer tube, when the inner tube moves towards a first direction relative to the outer tube, the supporting piece is gradually expanded at least in the radial direction, when the inner tube moves towards a second direction relative to the outer tube, the supporting piece is gradually contracted at least in the radial direction, and the first direction is opposite to the second direction.

In one embodiment, the supporting member is a mesh structure, and when the supporting member is in a contracted state, the supporting member is attached to the outer wall of the inner tube, and when the supporting member is in an expanded state, a part of the structure of the supporting member is radially far away from the inner tube.

In one embodiment, when the supporting member is in an expanded state, the two ends of the supporting member are conical, and the middle part of the supporting member is in a spherical arc shape;

or, when the support is in the expanded state, the support is ellipsoidal.

In one embodiment, the proximal end and/or the distal end of the support member is provided with a developing ring made of an elastic material, and the developing ring can move radially with the support member when the support member is gradually expanded or gradually contracted.

In one embodiment, the inner tube is provided with a developing ring, when the supporting member is in an expanded state, the supporting member has an annular contour line farthest from the inner tube, and the developing ring is located on a plane where the annular contour line is located.

In one embodiment, the support member is cut from a nickel titanium tube or woven from nickel titanium wire.

In one embodiment, the support system further comprises a handle and an adjustable bending device, the handle is used for controlling the relative movement of the inner tube and the outer tube, the adjustable bending device comprises a flexible traction member and an adjusting member, the inner tube is provided with a side cavity arranged at an interval with the guide wire cavity, the part of the inner tube close to the far end of the inner tube forms a bendable section, the flexible traction member is movably arranged in the side cavity in a penetrating mode and connected with the far end of the inner tube, and the adjusting member is arranged on the handle and used for drawing the far end of the inner tube through the flexible traction member so that the bendable section can be bent controllably.

In one embodiment, the connection point of the flexible traction member and the inner tube is positioned on the side of the side cavity far away from the guide wire cavity.

In one embodiment, the proximal end of the bendable section is fixed to the distal end of the support.

In one embodiment, the handle includes a locking mechanism, the outer tube is fixedly connected to the handle, the inner tube is movably disposed through the handle, the locking mechanism is used for locking or releasing the inner tube, when the locking mechanism locks the inner tube, the inner tube is axially or circumferentially limited to the outer tube, and when the locking mechanism releases the inner tube, the inner tube can axially or circumferentially move relative to the outer tube.

The utility model provides a support system, including support piece, inner tube and outer tube, support piece's distal end and near-end are fixed mutually with inner tube and outer tube respectively, the outside of inner tube is located to outer tube activity ground cover, when the relative outer tube of inner tube moves towards different directions, support piece is under the drive of inner tube and outer tube and shrink gradually or expand, alright so when CTO pathological change is opened to the seal wire, through expanding support piece to suitable state and laminating the vascular wall, stretch out support piece's distal end along the seal wire chamber of inner tube with the seal wire, support piece with the laminating of vascular wall can provide steadily for the seal wire and support, thereby avoid the seal wire to take place the bending because of the holding power is insufficient, effectively ensure that the seal wire accurately opens CTO pathological change.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, drawings of other embodiments can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of a support system according to one embodiment;

FIG. 2 is a schematic view of an embodiment of a stent in an expanded configuration;

FIG. 3 is a schematic view of an inner tubular structure of an embodiment of a support system;

FIG. 4 is a schematic view of an inner tubular structure of another embodiment of a support system;

FIG. 5 is a schematic view of a bendable section of a distal end of an inner tube being bend adjusted in one embodiment of a support system;

fig. 6 is a schematic view of a supporting member of the supporting system supporting a vessel wall near a lesion site according to an embodiment.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" 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," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

It should be noted that the terms "distal" and "proximal" are used as terms of orientation that are commonly used in the medical device art, wherein "distal" refers to the end that is distal from the operator during operation, and "proximal" refers to the end that is proximal to the operator during operation. Axial, meaning a direction parallel to the line connecting the center of the distal end and the center of the proximal end of the medical device; radial, means a direction perpendicular to the above-mentioned axial direction.

Referring to fig. 1, an embodiment of the present invention provides a support system, which includes a handle 1, an inner tube 2, an outer tube 3, and a support member 4.

Wherein the support member 4 has opposite distal and proximal ends, the inner tube 2 being fixed to the distal end of the support member 4, and the outer tube 3 being fixed to the proximal end of the support member 4. That is, the distal and proximal ends of the support 4 are fixed to the inner tube 2 and the outer tube 3, respectively, so that the state of the support 4 can be manipulated when the inner tube 2 and the outer tube 3 are relatively moved. The inner tube 2 has a guide wire lumen 21 (see fig. 3), and a guide wire passing through the guide wire lumen 21 can be protruded from the distal end of the support 4, so that the guide wire can be supported by the support 4 to stably open the CTO lesion.

The outer tube 3 is movably sleeved outside the inner tube 2, and the length of the outer tube 3 is smaller than that of the inner tube 2, so that the near end 2a and the far end 2b of the inner tube 2 are both exposed out of the outer tube 3, the inner tube 2 can be conveniently controlled to move relative to the outer tube 3, and the support member 4 is kept fixed between the inner tube 2 and the outer tube 3, so that the inner tube 2 and the outer tube 3 can move relative to each other, and the support member 4 can be acted on to adjust the state of the support member 4.

The inner tube 2 and the outer tube 3 can be made of nylon deformable materials, specifically single-layer tubes or composite woven mesh tubes.

The handle 1 is used for controlling the relative movement of the inner tube 2 and the outer tube 3. The support 4 gradually expands at least in a radial direction when the inner tube 2 moves in a first direction relative to the outer tube 3; the support members 4 are gradually contracted at least in a radial direction when the inner tube 2 is moved in a second direction with respect to the outer tube 3, the first direction being opposite to the second direction, that is, the support members 4 are changed to an expanded or contracted state when the inner tube 2 is moved in the opposite direction with respect to the outer tube 3.

Here, the first direction and the second direction may be a rotation direction of the inner tube 2 with respect to the outer tube 3, that is, a power source for expansion or contraction of the support 4 may be obtained by a relative rotation of the inner tube 2 and the outer tube 3. For example, in some embodiments, the support member 4 gradually expands in at least a radial direction when the inner tube 2 is rotated clockwise (first direction) relative to the outer tube 3; when the inner tube 2 is rotated counterclockwise (second direction) with respect to the outer tube 3, the support 4 is gradually contracted at least in the radial direction.

In other embodiments, the first direction and the second direction may be moving directions of the inner tube 2 relative to the outer tube 3 in an axial direction, for example, when the distal end of the inner tube 2 approaches (i.e., the first direction) the distal end of the outer tube 3, the support 4 is gradually expanded at least in a radial direction; when the distal end of the inner tube 2 is distant (i.e., in the second direction) with respect to the distal end of the outer tube 3, the support 4 is gradually contracted at least in the radial direction.

In this embodiment, since the proximal end and the distal end of the supporting member 4 are fixed to the inner tube 2 and the outer tube 3, the state of the supporting member 4 can be stably controlled to gradually expand or gradually contract during the relative movement of the inner tube 2 and the outer tube 3, so as to accurately and finely adjust the expanded state of the supporting member 4, and thus, the requirement for the attachment of the supporting member 4 to blood vessels of different diameters can be satisfied, and a good supporting effect can be obtained. When the laminating of support piece 4 and vascular wall, under the anchoring effect that the vascular wall provided, support piece 4 is comparatively stable and be difficult to the aversion to the back is worn out from support piece 4's distal end to the seal wire that penetrates in the seal wire chamber 21 of inner tube 2, the seal wire has the directionality of preferred under the stable support that support piece 4 provided, is difficult to appear owing to not being the crooked situation by better support, thereby has ensured effectively that the seal wire accurately gets into the CTO pathological change, improves the efficiency of opening the CTO pathological change.

It should be noted that the supporting member 4 is a structural member capable of expanding or contracting with the relative movement of the inner tube 2 and the outer tube 3, and has a variety of possible structural forms. For example, in some embodiments, the supporting member 4 is a net structure, and when the supporting member 4 is in a contracted state, the supporting member 4 is attached to the outer wall of the inner tube 2, so that the supporting member 4 and the inner tube 2 are thin as a whole and can easily move from the blood vessel to the CTO lesion. When the support member 4 is in the expansion state, the partial structure of the support member 4 is radially far away from the inner tube 2, so as to effectively increase the overall outer diameter, finally the support member 4 is attached to the wall of the blood vessel, the supporting force is increased by using the blood vessel wall, so that the guide wire penetrating into the guide wire cavity 21 can obtain stable support and is not easy to bend, and then the guide wire can powerfully and accurately enter the proximal end of the CTO lesion, so that the opening efficiency of the CTO lesion is improved.

The support member 4 is cut from a nickel titanium tube, or the support member 4 is woven from nickel titanium wire. The supporting member 4 has better deformability, so that the supporting member can be adjusted to a proper expansion state under the adjustment of the inner tube 2 and the outer tube 3, the fitting degree of the supporting member 4 and the vessel wall is improved, stable supporting performance is provided, and the vessel is not damaged by the excessive expansion of the supporting member 4.

In some embodiments, when the supporting member 4 is in the expanded state, the two ends of the supporting member 4 are tapered, and the middle portion of the supporting member 4 is in the shape of a spherical arc. The two ends of the supporting piece 4 are conical, so that a good guiding effect can be achieved. For example, when the support member 4 is in a compressed or semi-expanded state relative to the inner tube 2, such a tapered end portion of the support member 4 does not puncture the vessel wall, and is relatively easy to move within the vessel so as to move quickly to the vicinity of the CTO lesion site. In this embodiment, because support piece 4 under the expansion state, its mid portion is the sphere arc to when support piece 4 and vascular wall laminated, have great binding face, promote the anchoring force between support piece 4 and the vascular wall, thereby for the seal wire provides the effect of supporting more steadily, simultaneously, because the mid portion is the sphere arc, thereby can not produce the edges and corners, with the reduction to the stab of vascular wall.

In other embodiments, when the support member 4 is in the expanded state, the support member 4 is ellipsoidal, so that the two ends of the support member 4 are contracted as a whole, and the middle part of the support member is bulged, so that when the support member 4 is attached to the blood vessel wall, the support member 4 can provide stable support for the guide wire, and the possibility of pricking the blood vessel wall can be reduced as much as possible.

In some embodiments, the support 4 is provided with a developing ring, the developing ring may be provided at a proximal end position of the support 4, or at a distal end position of the support 4, or both the proximal end and the distal end of the support 4 are provided with developing rings. The position of the developing ring on the support 4 is not limited herein, as long as the developing ring can perform a developing effect to determine the position of the support 4 in the blood vessel.

The developing ring is made of an elastic material, and then when the supporter 4 is gradually expanded or gradually contracted, the developing ring can move along with the supporter 4 without being damaged, so that the position of the supporter 4 can be accurately judged by the developing ring no matter what state the supporter 4 is.

In some embodiments, the inner tube 2 is provided with a developing ring, when the supporting element 4 is in an expanded state, the supporting element 4 has an annular contour line farthest from the inner tube 2, and the developing ring is located on a plane where the annular contour line is located, so that the position of the developing ring in the inner tube 2 corresponds to a position where the supporting element 4 is most likely to contact with a blood vessel wall in the expanded state, and before and after the supporting element 4 is expanded to be attached to the blood vessel wall, the contact position of the supporting element 4 and the blood vessel wall can be accurately judged through the developing ring, so as to timely adjust the position of the supporting element 4, and finally the supporting element 4 is expanded at a proper distance from a CTO lesion position, so that the situation that the supporting element 4 is too close to the CTO lesion position and the direction of the guide wire entering the CTO lesion position is relatively limited after the guide wire penetrates out from the distal end of the inner tube 2 is avoided, and meanwhile, the supporting element 4 is also prevented from being too far from the CTO lesion position, when the guide wire is used for opening the CTO pathological change part, the guide wire excessively penetrates out of the far end of the inner tube 2, so that the support effect of the support piece 4 on the guide wire is too small, the guide wire is bent due to no good support, the opening operation on the CTO pathological change position cannot be powerfully performed, and the opening efficiency of the CTO pathological change is seriously influenced.

In some embodiments, the handle 1 comprises a locking mechanism 5, the outer tube 3 is fixedly connected to the handle 1, the inner tube 2 is movably disposed through the handle 1, the locking mechanism 5 is used for locking or releasing the inner tube 2, and when the locking mechanism 5 locks the inner tube 2, the expansion degree of the support 4 is locked. Accordingly, when the locking mechanism 5 releases the locking action on the inner tube 2, the relative movement of the inner tube 2 and the outer tube 3 adjusts the degree of expansion of the support 4.

The locking mechanism 5 will be further described below by taking axial relative movement or circumferential relative rotation of the inner tube 2 with respect to the outer tube 3, respectively.

In the embodiment in which the first direction and the second direction are the rotational directions of the inner tube 2 relative to the outer tube 3, when the locking mechanism 5 locks the inner tube 2, the inner tube 2 is circumferentially restrained to the outer tube 3, and then the inner tube 2 cannot rotate relative to the outer tube 3, at which time the degree of expansion of the support member 4 is locked. When the locking mechanism 5 releases the inner tube 2, the inner tube 2 can be rotated circumferentially relative to the outer tube 3 to adjust the degree of expansion of the support 4.

In the embodiment in which the first direction and the second direction are the moving directions of the inner tube 2 relative to the outer tube 3 in the axial direction, when the locking mechanism 5 locks the inner tube 2, the inner tube 2 is axially restrained to the outer tube 3, and then the inner tube 3 cannot move axially relative to the outer tube 3, at which time the degree of expansion of the support member 4 is locked. When the locking mechanism 5 releases the inner tube 2, the inner tube 2 can move axially relative to the outer tube 3 to adjust the degree of expansion of the support 4.

It should be noted that in some embodiments, the locking mechanism 5 is also used to regulate the movement of the outer tube 3 relative to the inner tube 2. For example, as shown in fig. 1 and fig. 2, the locking mechanism 5 is slidably connected to the base 11 of the handle 1, the outer tube 3 is movably disposed through the base 11 of the handle 1, and the proximal end of the outer tube 3 is connected to the locking mechanism 5, so that when the locking mechanism 5 is in a state of releasing the locking of the inner tube 2, the outer tube 3 can slide axially relative to the inner tube 2 by operating the locking mechanism 5 to slide relative to the base 11 of the handle 1, thereby changing the relative position of the inner tube 2 and the outer tube 3, and then controlling the expansion or contraction of the support member 4.

For example, as shown in fig. 1 and 2, when the locking mechanism 5 pushes the outer tube 3 to move towards the distal end of the inner tube 2 relative to the inner tube 2, and the distal end of the inner tube 2 approaches (i.e., in the first direction) relative to the distal end of the outer tube 3, the support member 4 gradually expands at least in the radial direction. Accordingly, when the locking mechanism 5 pushes the outer tube 3 to move towards the proximal end of the inner tube 2 relative to the inner tube 2, at which time the distal end of the inner tube 2 moves away (i.e., the second direction) relative to the distal end of the outer tube 3, the support member 4 gradually expands at least in the radial direction.

The proximal end 2a of the inner tube 2 may be provided with a catheter hub 8 so that a guidewire may be advanced through the catheter hub 8 and into the guidewire lumen 21 of the inner tube 2.

In some embodiments, as shown in connection with fig. 5, the support system comprises an adjustable bending device 6, the adjustable bending device 6 comprising an adjustment member 61 and a flexible traction member 7. The inner tube 2 has a side lumen 22 (shown in fig. 3) spaced from the guidewire lumen 21. As shown in connection with fig. 4, the side lumen 22 may be an annular lumen surrounding the guidewire lumen 21. The side lumen 22 may also be located alongside the guidewire lumen 21. The positions of the side lumen 22 and the guidewire lumen 21 are not limited as long as they do not interfere with each other in function.

As shown in fig. 1 and 2 in combination, a portion of the inner tube 2 near the distal end 2b thereof forms a bendable section 9. The flexible pulling member 7 is movably disposed through the side cavity 22 and connected to the distal end 2b of the inner tube 2. The adjustment member 61 is provided to the handle 1 and serves to pull the distal end 2b of the inner tube 2 by means of the flexible pulling member 7. Referring to fig. 5 and 6, the bendable section 9 is controllably bent under the traction of the flexible traction member 7, so that the micro-channel 10a in the vaso-occlusive segment 10 can be quickly found. Thus, the guide wire can enter the micro-channel 10a under the guidance of the bendable section 9 of the inner tube 2, and when the guide wire is pushed, the guide wire can obtain extra support at the micro-channel 10a, so that the guide wire can open the CTO lesion more powerfully and quickly, thereby saving the operation time and reducing the time of contacting radioactive rays for doctors and patients.

In the embodiment, the bending degree and the bending direction of the bendable section 9 are controllable under the traction of the flexible traction piece 7, so that the adoption of the adjustable bending device 6 can meet the searching requirement of the support system on the micro-channel 10a in different types of CTO lesion opening operation, effectively improve the application range of the support system and reduce the instrument cost.

In some embodiments, the adjusting member 61 has a self-locking property, specifically, when the adjusting member 61 releases the manipulation force on the adjusting member 61 after the bending state of the bendable section 9 is adjusted by the flexible traction member 7, the adjusting member 61 can keep the bendable section 9 in the bending state by the flexible traction member 7, and then the bending state of the bendable section 9 can be kept without the operator continuing to manipulate the adjusting member 61, so that the operator can concentrate on manipulating the guide wire to perform the opening operation on the CTO lesion along the inner tube 2.

In some embodiments, the connection point of the flexible pulling element 7 and the inner tube 2 is located on the side of the side cavity 22 away from the guidewire cavity 21, so that a side-biased pulling and pressing effect can be formed, the bending direction of the bendable section 9 is more consistent, good bending performance can be provided, and simultaneously, stable support can be provided for the guidewire, so that the guidewire accurately enters the micro-channel 10a at the position of the proximal end of the CTO lesion under the guidance of the bendable section 9 of the inner tube 2.

It should be noted that, in practical operation, the bending direction of the bendable section 9 in the blood vessel can be adjusted in coordination with the circumferential rotation of the inner tube 2 in the blood vessel, so that the micro-channel 10a can be searched from multiple angles and the requirement of the guide wire to enter the micro-channel 10a can be met.

In this embodiment, as shown in fig. 3, a perforation 22a is formed on a side wall of the side cavity 22 on a side away from the guidewire cavity 21, so that the flexible pulling member 7 enters the side cavity 22 from the perforation 22a after entering the handle 1 from the adjusting member 61, and finally the distal end of the flexible pulling member 7 can move to the distal end 2b of the inner tube 2 along the side cavity 22 and be fixedly connected with the distal end 2b of the inner tube 2.

In some embodiments, the proximal end of the bendable section 9 is fixed to the distal end of the support member 4, i.e., the bendable section 9 is located outside of the support member 4, so that the bendable section 9 can be in a stable position relative to the blood vessel under the supporting force provided by the support member 4. The bendable section 9 can be controllably bent without being constrained by the support 4 to guide the guide wire accurately into the micro-channel 10 a.

In some embodiments, the flexible pulling member 7 may be a steel wire with better tensile properties, so as to pull the distal end 2b of the inner tube 2, and to make the bendable section 9 at the distal end 2b of the inner tube 2 bend stably.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A support system, comprising:

a support having opposite distal and proximal ends;

2. The support system of claim 1, wherein the support member is a mesh structure, and wherein the support member is configured to engage the outer wall of the inner tube when the support member is in the contracted configuration and to be partially radially spaced from the inner tube when the support member is in the expanded configuration.

3. The support system of claim 2, wherein when the brace member is in the expanded state, the two ends of the brace member are tapered and the middle portion of the brace member is spherically curved;

or, when the support is in the expanded state, the support is ellipsoidal.

4. The support system according to claim 1, wherein the proximal end and/or the distal end of the support member is provided with a developer ring, the developer ring being made of an elastic material, the developer ring being radially movable with the support member when the support member is gradually expanded or gradually contracted.

5. The support system of claim 1, wherein the inner tube has a developer ring, and when the support member is in the expanded state, the support member has an annular contour that is furthest from the inner tube, and the developer ring is located on a plane of the annular contour.

6. The support system of claim 1, wherein the support member is cut from a nickel titanium tube or woven from nickel titanium wire.

7. The support system according to claim 1, further comprising a handle and an adjustable bending device, wherein the handle is used for controlling the relative movement of the inner tube and the outer tube, the adjustable bending device comprises a flexible pulling member and an adjusting member, the inner tube is provided with a side cavity arranged at a distance from the guide wire cavity, the part of the inner tube near the distal end of the inner tube forms a bendable section, the flexible pulling member is movably arranged in the side cavity in a penetrating way and is connected with the distal end of the inner tube, and the adjusting member is arranged on the handle and is used for pulling the distal end of the inner tube through the flexible pulling member so as to controllably bend the bendable section.

8. The support system of claim 7, wherein the connection of the flexible pull member to the inner tube is located on a side of the side lumen distal to the guidewire lumen.

9. The support system of claim 7, wherein a proximal end of the bendable section is secured to a distal end of the support member.

10. The support system according to any one of claims 7-9, wherein the handle comprises a locking mechanism, the outer tube is fixedly connected to the handle, the inner tube is movably disposed through the handle, the locking mechanism is configured to lock or release the inner tube, the inner tube is axially or circumferentially restrained to the outer tube when the locking mechanism locks the inner tube, and the inner tube is capable of moving axially or circumferentially relative to the outer tube when the locking mechanism releases the inner tube.