Drift diameter adjuster and drift diameter adjustable support system

Abstract

The invention discloses a drift diameter adjustor and a drift diameter adjustable support system, the drift diameter adjustor is suitable for a drift diameter adjustable support, and the drift diameter adjustor comprises a main body, a plurality of adjusting screws, a damping fixing piece and a fixing seat. The damping fixing part is connected to a supporting framework in the drift diameter adjustable support, the far end of the adjusting wire is connected to the supporting framework, and the near end of the adjusting wire extends into the adjusting wire channel in the body after passing through the damping fixing part and is connected with the adjusting wire connector after extending out. A disconnection node is arranged on the part, in the adjusting wire channel, of the adjusting wire; the adjusting screw connector is installed on the fixing base, and the adjusting screw connector rotates under the action of external force so that the adjusting screw can be disconnected at the disconnection node due to rotating torsion. When the driving fixing base drives the adjusting screw connector to move towards the near end under the action of external force, the adjusting screw is driven to overcome damping between the adjusting screw and the damping fixing piece to move towards the near end, the far end of the adjusting screw drives the supporting framework connected with the far end of the adjusting screw to move towards the damping fixing piece, and therefore the minimum drift diameter of the drift diameter adjustable support is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and in particular relates to a diameter regulator and a diameter-adjustable bracket system. Background Art

[0002] Portal hypertension is a group of symptoms caused by persistently high pressure in the portal vein. Most cases are caused by cirrhosis of the liver, but in a few cases it is secondary to obstruction of the main portal vein or hepatic veins and other unexplained conditions. The liver is the largest organ in the body, weighing about 1.4 kg and responsible for more than 500 functions. Most of the blood leaving the stomach and small intestine must pass through the liver. Cirrhosis occurs when normal liver tissue is damaged and replaced by scar tissue. Most of the blood that flows through the liver comes from the portal vein, and in a cirrhotic liver, scar tissue significantly slows the flow of blood from the portal vein through the liver. High portal pressure occurs when blood from the portal vein cannot flow back through the liver into the inferior vena cava. With less blood flowing through the liver, the blood now has to find a different way to get to the heart. The body diverts blood away from the liver by increasing blood flow through the blood vessels around the stomach and lower esophagus. This increased blood flow turns these blood vessels into swollen, twisted, and fragile veins called varicose veins. Varicose veins can rupture, causing bleeding that requires immediate medical attention.

[0003] At present, when treating patients with portal hypertension and gastric fundus bleeding caused by portal hypertension, transjugular intrahepatic puncture is often used to establish a pathway between the portal vein and the hepatic vein, implant a covered stent in the liver parenchyma, and establish a new blood flow channel to reduce portal hypertension. Transjugular intrahepatic portosystemic stent shunt (TIPS) has the characteristics of less trauma, fewer complications, and safety. It is an effective method for treating PHT, especially for patients with upper gastrointestinal bleeding caused by esophageal and gastric fundus varicose vein rupture, and its clinical efficacy has also been confirmed.

[0004] Currently, the best dedicated stent on the market is Gore's Viatorr stent. The diameter of the new generation of stents can be controlled at 8 and 10 mm (it can be controlled at 8 and 10 mm respectively through balloon expansion of different diameters), but it is still not suitable for all people. Too large a shunt flow can easily cause hepatic encephalopathy, and too small a shunt flow can easily cause rebleeding (the criterion for judging rebleeding is the portal vein pressure gradient, that is, the pressure difference at both ends of the stent). However, when the portal vein pressure gradient is ≦12 mmHg, the incidence of rebleeding decreases.

[0005] The existing stents and auxiliary devices for adjusting the diameter of the auxiliary stents can only expand the effective diameter of the stent during use, but cannot reduce the effective diameter. Due to the differences in the internal environment of different patients, there is no effective solution when it is determined that the effective diameter needs to be reduced. Currently, the only way is to re-place a new stent, and the new stent will expand to the required effective diameter according to the current demand for the diameter. Summary of the invention

[0006] In view of the above problems, the present invention provides a diameter regulator and a diameter adjustable bracket system.

[0007] The technical solution of the present invention is:

[0008] A diameter regulator is applicable to a diameter adjustable bracket, the diameter adjustable bracket comprises a support frame and a coating covered on the support frame, the diameter regulator comprises a main body, a plurality of adjustment wires, a damping fixing member and a fixing seat;

[0009] The damping fixing member is connected to the supporting frame, and the main body is provided with a plurality of adjusting wire channels, and the adjusting wire channels correspond to the adjusting wires one by one. The distal end of the adjusting wire is connected to the supporting frame, and the proximal end of the adjusting wire passes through the damping fixing member and extends into the corresponding adjusting wire channel and is connected to the adjusting wire connector after extending out; the plurality of adjusting wires are arranged along the circumference of the supporting frame;

[0010] The adjusting wire is provided with a disconnecting node on the portion inside the adjusting wire channel; the adjusting wire joint is installed on the fixing seat, and the adjusting wire joint can rotate relative to the fixing seat under the action of external force to drive the adjusting wire to twist, so that the adjusting wire is disconnected at the disconnecting node due to the rotational torque;

[0011] When the adjusting wire passes through the damping fixing part, there is damping between the adjusting wire and the damping fixing part to keep the relative positions of the two unchanged; when the fixing seat moves toward the proximal direction relative to the main body under the action of external force and all the adjusting wire joints respectively drive all the adjusting wires to overcome the corresponding damping and move toward the proximal direction, the distal end of the adjusting wire drives the supporting frame connected thereto to move toward the damping fixing part;

[0012] Wherein, when the distance between the connection point on the support frame with the damping fixing member and the connection point on the support frame with the distal end of the adjustment wire decreases, the minimum diameter of the adjustable diameter bracket decreases.

[0013] In a diameter adjuster provided in a preferred embodiment, the main body includes a base and a plurality of adjustment sleeves, the adjustment sleeves correspond one-to-one to the adjustment wires, and the proximal ends of the adjustment sleeves are connected to the base; a plurality of first through holes are provided on the base, the first through holes correspond one-to-one to the adjustment sleeves, and the first through holes are connected to the internal channels of the corresponding adjustment sleeves to form the adjustment wire channels.

[0014] In the diameter adjuster provided in a preferred embodiment, the distal end of the adjusting sleeve abuts against the proximal end of the damping fixing member.

[0015] In the diameter regulator provided in a preferred embodiment, an adjusting member is provided between the main body and the fixed seat, and the adjusting member is used to drive the fixed seat to move in the proximal direction relative to the main body under the action of an external force, so that the adjusting wire joint installed on the fixed seat drives the adjusting wire to overcome the damping and move in the proximal direction.

[0016] In the diameter regulator provided in a preferred embodiment, the adjusting member is sleeved on the main body and threadedly connected thereto, and the adjusting member can move in the proximal direction relative to the main body through the threaded connection;

[0017] The adjusting member is connected to the fixing seat, and the connection is configured to drive the fixing seat to move in the proximal direction relative to the main body when the adjusting member moves in the proximal direction relative to the main body.

[0018] In the diameter adjuster provided in a preferred embodiment, the adjusting member and the fixing seat are connected in such a manner that a proximal end of the adjusting member abuts against a distal end of the fixing seat.

[0019] In a diameter regulator provided in a preferred embodiment, a plurality of mounting grooves are provided on the proximal end surface of the fixing seat, respectively used to accommodate the adjusting wire joints; a second through hole corresponding to the mounting groove is provided on the fixing seat, and the proximal end of the second through hole is connected to the mounting groove from the groove bottom surface of the mounting groove, and the proximal end of the adjusting wire passes through the second through hole into the mounting groove after extending out of the adjusting wire channel, and is connected to the adjusting wire joint from the distal end of the adjusting wire joint;

[0020] There is friction between the outer wall of the adjusting wire joint and the inner wall of the mounting groove to prevent the adjusting wire joint from rotating. A connecting portion is provided on the proximal end face of the adjusting wire joint, and the connecting portion is used to connect with an external tool. The adjusting wire joint overcomes the friction force and rotates in the mounting groove under the action of the torque applied by the external tool.

[0021] In the diameter adjuster provided in a preferred embodiment, the damping fixing member is provided with a through hole for the adjusting wire to pass through, each adjusting wire passes through one through hole and the friction resistance between the adjusting wire and the side wall of the through hole forms the damping.

[0022] A diameter-adjustable bracket system, comprising a diameter-adjustable bracket and a diameter adjuster as described in any one of the above;

[0023] The adjustable diameter bracket comprises a support frame and a coating covered on the support frame, the support frame has an adjustment section along its axial direction, the adjustment section comprises a plurality of support rings and a plurality of support members, the plurality of support rings are arranged side by side and spaced along the axial direction of the support frame, the support members extend along the axial direction of the support frame and are sequentially connected to the support rings, and the plurality of support members are arranged along the circumference of the support frame;

[0024] The damping fixing member is connected to the proximal end of the supporting member or / and the supporting ring located at the most proximal end, and the distal end of the adjusting wire is connected to the distal end of the supporting member or / and the supporting ring located at the most distal end;

[0025] When the distance between the connection point between the support frame and the damping fixing member and the connection point with the distal end of the adjustment wire decreases, the support member deforms inwardly to reduce the minimum diameter of the adjustable diameter bracket in the corresponding area of ​​the adjustment section.

[0026] Due to the adoption of the above technical solution, the present invention has the following advantages and positive effects compared with the prior art:

[0027] The diameter regulator and diameter adjustable bracket system provided by the present invention, the distal end of the regulating wire and the support frame, by driving the fixed seat to move to pull the regulating wire to move in the proximal direction, can make the connection between the distal end of the regulating wire on the support frame close to the connection with the damping fixing part, so that the minimum diameter of the diameter adjustable bracket is reduced. After the adjustment is completed, the regulating wire is twisted by rotating the regulating wire joint, and then the regulating wire is broken at the disconnection node; after the regulating wire is broken, the part relatively located at the distal end remains on the diameter adjustable bracket, and at the same time, due to the existence of damping between the damping fixing part, the diameter adjustable bracket will remain in the status quo, while the part relatively located at the proximal end is separated from the diameter adjustable bracket, and this part is withdrawn together with other structures of the diameter regulator (excluding the damping fixing part). BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the following detailed description of the preferred embodiment.The drawings are only for the purpose of illustrating the preferred embodiments and are not to be construed as limiting the invention.

[0029] Figure 1 This is a schematic diagram of the structure of a diameter-adjustable bracket in Example 2;

[0030] Figure 2 and Figure 3 This is a schematic diagram of the principle of reducing the diameter of a diameter-adjustable bracket in Example 2;

[0031] Figure 4 This is a schematic diagram of the structure of a diameter-adjustable bracket in Example 3;

[0032] Figure 5 This is a schematic diagram of the principle of reducing the diameter of a diameter-adjustable bracket in Example 3;

[0033] Figure 6 This is a schematic structural diagram of a diameter-adjustable bracket system in Example 1;

[0034] Figure 7 It is a structural schematic diagram of a disconnect node on an adjustment wire.

[0035] Description of reference numerals:

[0036] 1: Support member; 2: Support ring; 3: Coating; 4: Adjustment wire; 5: Damping fixing unit; 6: Turning point; 7: Base; 8: Adjustment sleeve; 9: Disconnection node; 10: Adjustment member; 11: Adjustment wire joint; 12: Fixing seat; 14: Fixing point; D1: Diameter. DETAILED DESCRIPTION

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0038] In order to simplify the drawings, only the parts related to the present invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0039] Example 1

[0040] See also Figures 1 to 7This embodiment provides a diameter regulator, which is an auxiliary device for adjusting the effective diameter of a stent. The diameter regulator provided in this embodiment is suitable for a diameter-adjustable stent, which includes a support frame and a coating 3 covering the support frame.

[0041] The diameter regulator includes a main body, a plurality of adjustment wires 4, a damping fixture and a fixing seat 12. The main body is provided with a plurality of adjustment wire channels, which correspond to the adjustment wires 4 one by one. The damping fixture is connected to the support frame, the distal end of the adjustment wire 4 (the distal end refers to the end away from the operator in the conveying direction of the diameter adjustable bracket during surgery, and the proximal end refers to the end close to the operator in the conveying direction of the diameter adjustable bracket during surgery) is connected to the support frame, and the proximal end of the adjustment wire 4 extends into the corresponding adjustment wire channel after passing through the damping fixture and connects to the adjustment wire connector 11 after extending. A plurality of adjustment wires 4 are arranged along the circumference of the support frame.

[0042] A disconnect node 9 is provided on the portion of the adjusting wire 4 in the adjusting wire channel. The adjusting wire joint 11 is mounted on the fixing seat 12. The adjusting wire joint 11 can rotate relative to the fixing seat 12 under the action of an external force to drive the adjusting wire 4 to twist, so that the adjusting wire 4 is disconnected at the disconnect node 9 due to the rotational torque. In this way, when the diameter adjustment of the diameter-adjustable bracket is completed, the adjusting wire 4 can be disconnected by rotating the adjusting wire joint 11, and then the portion of the adjusting wire 4 relatively close to the proximal end is withdrawn together with the other parts of the diameter adjuster (excluding the damping fixing member).

[0043] When the adjusting wire 4 passes through the damping fixing part, there is damping between it and the damping fixing part to keep the relative positions of the two unchanged. In this way, after the diameter adjustment of the adjustable diameter bracket is completed and the adjusting wire 4 is disconnected at the disconnection node 9, the relative position between the adjusting wire 4 and the damping fixing part on the adjustable diameter bracket remains unchanged, and the adjustable diameter bracket can maintain the status quo.

[0044] When the fixing seat 12 moves toward the proximal direction relative to the main body under the action of external force, so that all the adjusting wire joints 11 respectively drive all the adjusting wires 4 to overcome the corresponding damping and move toward the proximal direction, the distal end of the adjusting wire 4 drives the supporting frame connected thereto to move toward the damping fixing part, and when the distance between the connection part with the damping fixing part and the connection part with the distal end of the adjusting wire 4 on the supporting frame decreases, the minimum diameter of the diameter-adjustable bracket decreases. Therefore, by using the diameter adjuster provided in this embodiment, the effective diameter of the diameter-adjustable bracket can be reduced.

[0045] The diameter regulator of this embodiment is further described below:

[0046] The distal end of the adjusting wire 4 is fixedly connected to the supporting frame, and specifically, welding connection or the like can be adopted. The damping fixing member is fixedly connected to the supporting frame, and specifically, welding connection or the like can also be adopted. A plurality of through holes are provided on the damping fixing member, and the through holes correspond to the adjusting wire 4 one by one. The adjusting wire 4 can be arranged along the longitudinal structure of the supporting frame. When the adjusting wire 4 extends toward the proximal direction along the longitudinal structure of the supporting frame, when passing through the damping fixing member, the damping fixing member is provided with a corresponding through hole at this position, and the adjusting wire 4 passes through the damping fixing member by piercing the through hole. The friction resistance between the adjusting wire 4 and the side wall of the through hole forms the above-mentioned damping, and the existence of the damping makes it possible for the adjusting wire 4 to slide in the through hole only when the force pulling the adjusting wire 4 is greater than a certain value, so that after the effective diameter of the diameter adjustable bracket is adjusted by the diameter regulator and the adjusting wire 4 is disconnected at the disconnection node 9, the diameter adjustable bracket can maintain the status quo and will not return to the state before the diameter regulator is adjusted.

[0047] The disconnection node 9 of the adjusting wire 4 is set to be resistant to stretching but not to rotational torque. Therefore, the adjusting wire 4 will not be disconnected at the disconnection node 9 when subjected to tension, but it is easy to be disconnected when subjected to torsion. As for how to achieve that the disconnection node 9 of the adjusting wire 4 is resistant to stretching but not to rotational torque, there are many ways to achieve this through the coordination of materials, structures, etc., such as Figure 7 As shown in the figure, a notch is set in the middle of the knot, etc., which is not limited here.

[0048] The main body includes a base 7 and a plurality of adjustment sleeves 8, the adjustment sleeves 8 correspond to the adjustment wires 4 one by one, and the proximal end of the adjustment sleeves 8 is connected to the base 7. A plurality of first through holes are provided on the base 7, the first through holes correspond to the adjustment sleeves 8 one by one, and the first through holes are connected to the internal channels of the corresponding adjustment sleeves 8 to form an adjustment wire channel. Further, the distal end of the adjustment sleeve 8 can abut against the proximal end of the damping fixture, so that when the adjustment wire 4 is pulled to move toward the proximal direction by moving the fixing seat 12, the adjustment sleeve 8 can give the damping fixture an abutment force to keep the position of the damping fixture unchanged (of course, the damping fixture is connected to the supporting frame, and even without the abutment of the adjustment sleeve 8, it can remain motionless or move only slightly).

[0049] An adjusting member 10 is provided between the base 7 and the fixed seat 12. The adjusting member 10 is used to drive the fixed seat 12 to move in the proximal direction relative to the main body under the action of an external force, so that the adjusting wire connector 11 installed on the fixed seat 12 drives the adjusting wire 4 to overcome the damping and move in the proximal direction. Specifically, the adjusting member 10 is sleeved on the base 7 and threadedly connected thereto. When the adjusting member 10 rotates on the base 7 through the threaded connection with the base 7, the adjusting wire 4 can move in the proximal direction relative to the base 7; and the adjusting member 10 is connected to the fixed seat 12, and the connection method is configured to drive the fixed seat 12 to move in the proximal direction relative to the base 7 when the adjusting member 10 moves in the proximal direction relative to the base 7. In this embodiment, the connection method of the adjusting member 10 and the fixed seat 12 is: the proximal end of the adjusting member 10 abuts against the distal end of the fixed seat 12; of course, other connection methods can also be used in other embodiments, such as connection through bearings.

[0050] A plurality of mounting grooves are provided on the proximal end surface of the fixing seat 12, which are respectively used to accommodate the adjusting wire joint 11, that is, the mounting grooves correspond to the adjusting wire joint 11 one by one. A second through hole corresponding to the mounting groove is provided on the fixing seat 12, and the proximal end of the second through hole is connected to the mounting groove from the bottom surface of the groove of the mounting groove. The proximal end of the adjusting wire 4 passes through the second through hole into the mounting groove after extending out of the adjusting wire channel, and is connected to the adjusting wire joint 11 from the distal end of the adjusting wire joint 11. There is a friction force between the outer side wall of the adjusting wire joint 11 and the inner side wall of the mounting groove to prevent the adjusting wire joint 11 from rotating. A connecting portion is provided on the proximal end surface of the adjusting wire joint 11, and the connecting portion is used to connect with an external tool. The adjusting wire joint 11 rotates in the mounting groove by overcoming the friction force under the action of the torque applied by the external tool. The specific structure of the connection part is designed according to the specific shape of the external tool to be used during the design. For example, when the diameter adjuster is designed to drive the adjusting wire connector 11 to rotate by a star-shaped hexagonal screwdriver, the connection part can be a groove that matches the shape of the blade of the star-shaped hexagonal screwdriver and is arranged on the proximal end surface of the adjusting wire connector 11. The existence of the friction between the outer wall of the adjusting wire connector 11 and the inner wall of the installation groove to prevent the adjusting wire connector 11 from rotating can effectively prevent misoperation.

[0051] Example 2

[0052] See also Figures 1 to 3 , Figure 5 and Figure 6 This embodiment provides a diameter-adjustable bracket system, including a diameter-adjustable bracket and the diameter adjuster described in Example 1, and the diameter adjuster is used to adjust the effective diameter of the adjustable bracket.

[0053] The diameter-adjustable bracket includes a support frame and a coating 3 covered on the support frame. The support frame has an adjustment section along its axial direction. The adjustment section includes a plurality of support rings 2 and a plurality of support members 1. The plurality of support rings 2 are arranged side by side and spaced apart along the axial direction of the support frame. The support members 1 extend along the axial direction of the support frame and are connected to the support rings 2 in sequence. The plurality of support members 1 are arranged along the circumference of the support frame.

[0054] The damping fixture is connected to the proximal end of the support member 1 or / and the support ring 2 at the nearest end, and the distal end of the adjustment wire 4 is connected to the distal end of the support member 1 or / and the support ring 2 at the farthest end. When the distance between the connection point with the damping fixture and the connection point with the distal end of the adjustment wire 4 on the support frame decreases, that is, the axial length of the adjustment section decreases, in order to reduce the axial length of the adjustment section, the support member 1 will deform inwardly, and the inward deformation of the support member 1 will reduce the diameter D1 of the deformation point, thereby reducing the minimum diameter of the corresponding area of ​​the adjustment section, and further reducing the effective diameter of the diameter-adjustable bracket.

[0055] Specifically, the entire support frame can be formed by laser cutting on the same piece of material, wherein one section of the entire support frame along the axial direction is used as the adjustment section. It should be noted that the adjustment section needs to be the middle part of the support frame and cannot be at the end of the support frame, and in the entire support frame, only the structure in the adjustment section is called the support ring 2 and the support member 1. That is, even if there is a structure similar to the support ring 2 in the part outside the adjustment section on the support frame, only the structure in the adjustment section is called the support ring 2, and the support ring 2 located at the proximal and distal ends refers to the structure at the two ends of the adjustment section; even if the support member 1 extends out of the adjustment section area to both ends, only the part in the adjustment section is called the support member 1, and the proximal and distal ends of the support member 1 refer to the proximal and distal ends of the part of the component containing the support member 1 in the adjustment section. Among them, although the support ring 2 is called a "ring", it is only used to indicate that it is closed in the circumferential direction of the support frame, and it does not mean that it must be in the shape of a circular ring.

[0056] The adjusting wire 4 is preferably arranged along the longitudinal structure of the supporting frame. In the adjusting section, the longitudinal structure of the supporting frame is the supporting member 1, so the adjusting wire 4 is preferably arranged along the supporting member 1 in the adjusting section, and the distal end of the adjusting wire 4 is connected to the supporting member 1. In this embodiment, each adjusting wire 4 corresponds to a supporting member 1, and the distal end of the adjusting wire 4 is connected to the corresponding supporting member 1, and the connection method can be welding connection or the like.

[0057] The support member 1 is made of elastic material and has elasticity. When the portion of the adjustment section connected to the distal end of the adjustment wire 4 approaches the portion connected to the damping fixing member, the support member 1 is driven to arch inward.

[0058] Specifically, Figure 2 and Figure 3 As shown, the support member 1 corresponding to the adjustment wire 4 has a plurality of deformation sections and a plurality of non-deformation sections, and the deformation sections and the non-deformation sections are arranged at intervals. The support member 1 corresponding to the adjustment wire 4 has an internal channel, and in the non-deformation section area, the adjustment wire 4 is located in the internal channel of the support member 1; in the deformation section area, the adjustment wire 4 is located outside the support member 1. The support member 1 is provided with a conversion through hole connecting the internal channel and the outside at the junction of the deformation section and the non-deformation section, and the conversion through hole is used for the adjustment wire 4 to pass through, so that the adjustment wire 4 can enter the internal channel of the support member 1 from the outside, or the adjustment wire 4 can leave the internal channel of the support member 1. When the part of the adjustment section connected to the distal end of the adjustment wire 4 approaches the part connected to the damping fixing member, the deformation section of the support member 1 arches inward. Preferably, each support member 1 has a deformation section and a non-deformation section, and the junction of the deformation section and the non-deformation section is located at the connection between the support member 1 and the support ring 2; in the support member 1 without the corresponding adjustment wire 4, the junction of the deformation section and the non-deformation section may not be provided with a conversion through hole.

[0059] like Figure 3 As shown, from the far end of the adjusting wire 4 and the fixed point 13 on the support 1, the length of L9 is certain (that is, the length of the adjusting wire 4 from the connection between it and the support 1 to the proximal direction is constant). When L1 changes, for example, when L1 becomes larger (pulling the adjusting wire 4 to the proximal direction), the sum of L2+L3+...+L7 will definitely become smaller. Among them, L2, L3, and L4 are the internal passages through which the adjusting wire 4 passes through the support 1 (that is, the non-deformation section), so the force required to change L2, L3, and L4 is the force required to flatten the material, which is tentatively designated as F1 here. The force required to change L5, L6, and L7 (corresponding to the deformation section) is the force required to bend and arch the material, which is tentatively designated as F2 here. F1 is much larger than F2. According to the principle of "whoever is weaker changes first", when L1 becomes larger, changes will occur in L5, L6, and L7. L5, L6, and L7 become smaller, and the deformation section of the support 1 arches. For the other support members 1 that do not correspond to the adjusting wires 4 , due to the effect of the support ring 2 , the deformation sections of the support members 1 will also arch inwards accordingly.

[0060] The damping fixing member may include a plurality of damping fixing units 5, and the damping fixing units 5 correspond to the adjusting wires 4 one by one, and a through hole is arranged on each damping fixing unit 5 for passing the corresponding adjusting wires 4. The damping fixing units 5 correspond to the adjusting wires 4 one by one, and the support member 1 also corresponds to the adjusting wires 4 one by one, and the damping fixing units 5 are connected to the support member 1 corresponding to the corresponding adjusting wires 4. The distal end of the adjusting wire 4 is connected to the corresponding support member 1, and the adjusting wire 4 is arranged along the support member 1. When the adjusting wire 4 extends in the proximal direction, it passes through the through hole on the corresponding damping fixing unit 5, and then extends into the corresponding adjusting wire channel. Of course, in other embodiments, the damping fixing member may also adopt other structures, for example, it may be an annular structure similar to the support ring 2, on which a plurality of through holes are arranged according to the position of the adjusting wire 4.

[0061] Preferably, the distal ends of all adjusting wires 4 and the connection points of each support member 1 on the adjusting section are located in the same plane, and the plane is perpendicular to the axis of the adjusting section. The connection points of all damping fixing units 5 and each support member 1 on the adjusting section are located in the same plane, and the axis of the plane adjusting section is perpendicular.

[0062] The coating 3 is arranged inside the supporting frame, and both ends of the coating 3 extend out of the adjusting section and are woven together with the longitudinal structure of the area outside the adjusting section.

[0063] Example 3

[0064] See also Figures 4 to 6 This embodiment provides a diameter-adjustable stent system based on the embodiment 2. The difference between this embodiment and the embodiment 2 is that the diameter-adjustable stent is different, and the specific difference is that when the part of the adjustment section connected to the distal end of the adjustment wire 4 approaches the part connected to the damping fixing member, the way in which the support member 1 deforms inward is different. That is, the specific design of the support member 1 is different from that in the embodiment 2.

[0065] In this embodiment, the support member 1 has a plurality of turning points 6 arranged at intervals along its extension direction. When the portion of the adjustment section connected to the distal end of the adjustment wire 4 approaches the portion connected to the damping fixing member, the support member 1 deforms inwardly through the turning point 6. Specifically, the support member 1 has a first section, a second section and a third section along its extension direction, and the second section is located between the first section and the third section. On the support member 1 corresponding to the adjustment wire 4, the adjustment wire 4 is passed through the internal channel of the first section and the third section; on the corresponding area of ​​the second section, the adjustment wire 4 is located outside the support member 1. The support member 1 portion of the second section is divided into a plurality of rod units connected in sequence, and the rod units are rotationally connected by a rotating shaft, and the rod units at the head and tail ends are rotationally connected to the first section and the third section respectively by a rotating shaft. The turning point 6 on the above-mentioned support member 1 is the rotating shaft.

[0066] When the adjustment wire 4 is pulled to move in the proximal direction, the length of the support member 1 in the axial direction of the support frame is forced to decrease. At this time, there are two main ways to force the length of the support member 1 in the axial direction of the support frame to be forced to decrease, namely: ① flattening the first section and the third section of the support member 1, and ② rotating the rod unit in the second section of the support member 1. Compared with the force required to flatten the first section and the third section of the support member 1, the force required for the rod unit to overcome the friction force at the rotating shaft to rotate the rod unit is much smaller. Therefore, when the part of the adjustment section connected to the distal end of the adjustment wire 4 approaches the part connected to the damping fixing member, that is, when the adjustment wire 4 is pulled to move in the proximal direction, the rod units in the support member 1 will rotate, causing the support member 1 to deform inward.

[0067] Specifically, the turning point 6 on the support member 1 , that is, the rotation axis, can be set at the connection with the support ring 2 .

[0068] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they still fall within the protection scope of the present invention.

Claims

1. A diameter regulator, characterized in that: Applicable to a diameter-adjustable bracket, the diameter-adjustable bracket comprises a support frame and a coating covered on the support frame, and the diameter adjuster comprises a main body, a plurality of adjustment wires, a damping fixing member and a fixing seat; The damping fixing member is connected to the supporting frame, and the main body is provided with a plurality of adjusting wire channels, and the adjusting wire channels correspond to the adjusting wires one by one. The distal end of the adjusting wire is connected to the supporting frame, and the proximal end of the adjusting wire passes through the damping fixing member and extends into the corresponding adjusting wire channel and is connected to the adjusting wire connector after extending out; the plurality of adjusting wires are arranged along the circumference of the supporting frame; The adjusting wire is provided with a disconnecting node on the portion inside the adjusting wire channel; the adjusting wire joint is installed on the fixing seat, and the adjusting wire joint can rotate relative to the fixing seat under the action of external force to drive the adjusting wire to twist, so that the adjusting wire is disconnected at the disconnecting node due to the rotational torque; When the adjusting wire passes through the damping fixing part, there is damping between the adjusting wire and the damping fixing part so as to keep the relative positions of the two unchanged; When the fixing seat moves toward the proximal direction relative to the main body under the action of external force and all the adjusting wire joints respectively drive all the adjusting wires to overcome the corresponding damping and move toward the proximal direction, the distal end of the adjusting wire drives the supporting frame connected thereto to move toward the damping fixing member; Wherein, when the distance between the connection point on the support frame with the damping fixing member and the connection point on the support frame with the distal end of the adjustment wire decreases, the minimum diameter of the adjustable diameter bracket decreases.

2. The diameter regulator according to claim 1, characterized in that: The main body includes a base and a plurality of adjustment sleeves, the adjustment sleeves correspond one-to-one to the adjustment wires, and the proximal ends of the adjustment sleeves are connected to the base; the base is provided with a plurality of first through holes, the first through holes correspond one-to-one to the adjustment sleeves, and the first through holes are connected to the internal channels of the corresponding adjustment sleeves to form the adjustment wire channels.

3. The diameter regulator according to claim 2, characterized in that: The distal end of the adjusting sleeve abuts against the proximal end of the damping fixing member.

4. The diameter regulator according to claim 1, characterized in that: An adjusting member is provided between the main body and the fixing seat, and the adjusting member is used to drive the fixing seat to move in the proximal direction relative to the main body under the action of external force, so that the adjusting wire joint installed on the fixing seat drives the adjusting wire to overcome the damping and move in the proximal direction.

5. The diameter regulator according to claim 4, characterized in that: The adjusting member is sleeved on the main body and threadedly connected thereto, and the adjusting member can be moved toward the proximal direction relative to the main body through the threaded connection; The adjusting member is connected to the fixing seat, and the connection is configured to drive the fixing seat to move in the proximal direction relative to the main body when the adjusting member moves in the proximal direction relative to the main body.

6. The diameter regulator according to claim 5, characterized in that: The adjusting member and the fixing seat are connected in such a manner that the proximal end of the adjusting member abuts against the distal end of the fixing seat.

7. The diameter regulator according to claim 1, characterized in that: A plurality of mounting grooves are provided on the proximal end surface of the fixing seat, respectively used to accommodate the adjusting wire joints; a second through hole corresponding to the mounting groove is provided on the fixing seat, and the proximal end of the second through hole is connected to the mounting groove from the groove bottom surface of the mounting groove, and the proximal end of the adjusting wire passes through the second through hole into the mounting groove after extending out of the adjusting wire channel, and is connected to the adjusting wire joint from the distal end of the adjusting wire joint; There is friction between the outer wall of the adjusting wire joint and the inner wall of the mounting groove to prevent the adjusting wire joint from rotating. A connecting portion is provided on the proximal end face of the adjusting wire joint, and the connecting portion is used to connect with an external tool. The adjusting wire joint overcomes the friction force and rotates in the mounting groove under the action of the torque applied by the external tool.

8. The diameter regulator according to claim 1, characterized in that: The damping fixing member is provided with a through hole for the adjusting wire to pass through, each adjusting wire passes through one through hole, and the friction resistance between the adjusting wire and the side wall of the through hole forms the damping.

9. A diameter adjustable bracket system, characterized in that: It comprises a diameter-adjustable bracket and a diameter adjuster as claimed in any one of claims 1 to 8; The adjustable diameter bracket comprises a support frame and a coating covered on the support frame, the support frame has an adjustment section along its axial direction, the adjustment section comprises a plurality of support rings and a plurality of support members, the plurality of support rings are arranged side by side and spaced along the axial direction of the support frame, the support members extend along the axial direction of the support frame and are sequentially connected to the support rings, and the plurality of support members are arranged along the circumference of the support frame; The damping fixing member is connected to the proximal end of the supporting member or / and the supporting ring located at the most proximal end, and the distal end of the adjusting wire is connected to the distal end of the supporting member or / and the supporting ring located at the most distal end; When the distance between the connection point between the support frame and the damping fixing member and the connection point with the distal end of the adjustment wire decreases, the support member deforms inwardly to reduce the minimum diameter of the adjustable diameter bracket in the corresponding area of ​​the adjustment section.

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