Adjustable vascular stent

Abstract

The invention relates to an adjustable blood vessel stent, belonging to the technical field of devices for providing openings or preventing collapse of human tubular structures, comprising a stent body and a support adjuster arranged in the stent body, wherein the support adjuster comprises a support ring supported on the inner wall of the stent body, a driving rod radially arranged on the inner wall of the support ring, an expansion cylinder arranged at the end of the driving rod, an extrusion cylinder coaxially arranged in the expansion cylinder and a driving shaft coaxially arranged in the extrusion cylinder, wherein the driving shaft is connected to the extrusion cylinder through a threaded pair, a permanent magnet is arranged at one end of the driving shaft, and a fixed seat is arranged at the other end, the expansion cylinder is a thin-walled cylinder, and the extrusion cylinder is a conical cylinder, wherein the permanent magnet can rotate under the action of an external magnetic force, driving the driving shaft to rotate, thereby driving the conical cylinder to move horizontally to extrude the expansion cylinder, thereby causing the expansion cylinder to expand outward, thereby causing the driving shaft to extend radially, driving the inner diameter of the support ring to expand, and expanding the stent body.

Description

Technical Field

[0001] The present invention relates to the technical field of devices for providing openings or preventing collapse of human tubular structures, and in particular to a vascular stent capable of adjusting its expansion level in vitro to improve its adaptability. Background Art

[0002] An internal stent is placed in the lesion segment to support the narrowed and occluded blood vessel, reduce the elastic retraction and reshaping of the blood vessel, and maintain smooth blood flow in the lumen. Vascular stents can be divided into two types according to the way they are deployed in the blood vessel: self-expanding type and balloon-expandable type. The former, such as Z-shaped stents and mesh-shaped stents, can expand themselves in the blood vessel. The latter is inelastic and relies on the balloon to expand to a certain diameter value and adhere to the blood vessel. Regardless of the self-expanding type or the balloon type, it can only be in a certain fixed state, and its size cannot be adjusted. After being installed or after being used for a period of time, due to certain special circumstances, its expansion level cannot reach the ideal state, resulting in insufficient blood supply and causing accidents, and the stent needs to be replaced, resulting in serious economic consequences.

[0003] Therefore, proposing a vascular stent that can adjust the size is a technical problem that technicians in this field urgently need to solve. Summary of the invention

[0004] In view of this, an object of the present invention is to provide an adjustable vascular stent, which can adjust the stent opening by applying a driving force externally, so as to achieve a predetermined blood flow level, so as to solve the problem that the existing stent cannot adjust the blood flow level and there is an insufficient safety risk or the stent needs to be replaced, thereby increasing the treatment cost.

[0005] The present invention is achieved through the following technical solutions:

[0006] An adjustable vascular stent includes a stent body and a support adjuster arranged in the stent body, the support adjuster includes a support ring supported on the inner wall of the stent body, a drive rod radially arranged on the inner wall of the support ring, an expansion cylinder arranged at the end of the drive rod, an extrusion cylinder coaxially arranged in the expansion cylinder and a drive shaft coaxially arranged in the extrusion cylinder, the drive shaft is connected to the extrusion cylinder through a threaded pair, one end of the drive shaft is provided with a permanent magnet, and the other end is provided with a fixed seat, the expansion cylinder is a thin-walled cylinder, and the extrusion cylinder is a conical cylinder, the permanent magnet can rotate under the action of external magnetic force, driving the drive shaft to rotate, the fixed seat is arranged in a rotating space, the drive shaft is inserted into the rotating space to realize rotational freedom, driving the conical cylinder to move horizontally to extrude the expansion cylinder, thereby causing the expansion cylinder to expand outward, and then the drive shaft extends radially, driving the inner diameter of the support ring to expand, and expanding the stent body.

[0007] Furthermore, a plurality of limiting pins arranged along the axial direction are provided in the radial direction of the conical tube, and a sliding groove for the axial movement of the limiting pins is provided in the thin-walled tube.

[0008] Furthermore, a connecting block is provided between the fixing seat and the thin-walled tube.

[0009] Furthermore, three driving rods are arranged along the circumference of the support ring, and expansion bearing plates are arranged on the contact surfaces between the three driving rods and the support ring. The expansion bearing plates are arc-shaped plates that match the shape of the support ring.

[0010] Furthermore, the support ring includes a tube body and a strip body, the tube body and the strip body are both made of elastic material, and the tail of the strip body can be inserted into the tube body to form a circular ring shape.

[0011] Furthermore, a damping film is provided on the surface of the elongated body to prevent the elongated body from exiting the tube body and to keep the supporting ring in a circular shape.

[0012] Furthermore, the thin-walled tube is made of elastic material, and a plurality of long holes arranged along the axial direction are provided on the surface.

[0013] Furthermore, the opening directions of any two adjacent elongated holes among the plurality of elongated holes are opposite.

[0014] Furthermore, a flow sensor and a signal transmitter are provided at the front end of the fixing seat. The flow sensor is used to measure the blood flow per unit time, and the signal transmitter is used to wirelessly transmit the blood flow signal.

[0015] The beneficial effects of the present invention are:

[0016] The permanent magnet of the present invention rotates under the action of external magnetic force, driving the driving shaft to rotate, and under the action of the thread width, driving the conical tube to move horizontally, squeezing the expansion tube, causing the expansion tube to expand outward, and then pushing the driving shaft to extend radially, driving the inner diameter of the support ring to expand, and finally realizing the expansion adjustment of the bracket body.

[0017] The present invention can be operated in vitro, reducing the time and treatment costs of interventional surgery, and also reducing the patient's treatment pain level. It fundamentally realizes the arbitrary adjustment of stent expansion, so that the blood flow level is always in a stable state, bringing convenience to the patient's rapid recovery.

[0018] The present invention can also detect blood flow in real time and transmit the detection data in real time, which is convenient for real-time monitoring and adjustment by external medical staff, so that the patient's stent blood flow can be controlled at a stable level, further improving the accuracy of adjustment and the reliability and safety of the stent used by the patient. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention;

[0020] Figure 2It is a front view of the present invention;

[0021] Figure 3 It is a left side view of the present invention;

[0022] Figure 4 It is a schematic diagram of the structure of the support regulator;

[0023] Figure 5 is a cross-sectional view of a support regulator;

[0024] Figure 6 It is a structural schematic diagram of the expansion tube;

[0025] Figure 7 This is the state diagram after the support ring is opened;

[0026] Figure 8 Schematic diagram of the support ring working state.

[0027] Description of reference numerals:

[0028] 1- bracket body; 2- support adjuster; 3- support ring; 4- driving rod; 5- expansion cylinder; 6- extrusion cylinder; 7- driving shaft; 8- permanent magnet; 9- fixed seat; 10- rotating space; 11- limiting pin; 12- sliding groove; 13- connecting block; 14- expansion load-bearing plate; 15- tube body; 16- long strip body; 17- long strip hole; 18- flow sensor; 19- signal transmitter; 20- damping membrane. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0032] In the above description of the present invention, it should be noted that the terms "one side", "the other side", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0033] In addition, the term "same" does not mean that the parts must be absolutely the same, but slight differences are allowed. The term "vertical" only means that the positional relationship between the parts is more vertical than "parallel", and does not mean that the structure must be completely vertical, but can be slightly tilted.

[0034] like Figures 1 to 8 As shown, an adjustable vascular stent includes a stent body 1 and a support adjuster 2, the support adjuster is arranged in the stent body for adjusting the expansion of the stent body, the support adjuster of this embodiment includes a support ring 3 supported on the inner wall of the stent body, a driving rod 4 radially arranged on the inner wall of the support ring, an expansion cylinder 5 arranged at the end of the driving rod, an extrusion cylinder 6 coaxially arranged in the expansion cylinder and a driving shaft 7 coaxially arranged in the extrusion cylinder, the driving shaft and the extrusion cylinder are connected through a threaded pair, a permanent magnet 8 is arranged at one end of the driving shaft, and a fixed seat 9 is arranged at the other end, the expansion cylinder is a thin-walled cylinder, and the extrusion cylinder is a conical cylinder, the permanent magnet can rotate under the action of external magnetic force, driving the driving shaft to rotate, the fixed seat is arranged in a rotating space 10, the driving shaft is inserted into the rotating space to realize the rotational freedom, driving the conical cylinder to move horizontally to extrude the expansion cylinder, thereby causing the expansion cylinder to expand outward, and then the driving shaft extends radially, driving the inner diameter of the support ring to expand, and expanding the stent body.

[0035] In this embodiment, a plurality of axially arranged limiting pins 11 are provided in the radial direction of the conical tube, and a sliding groove 12 is provided for axial movement of the limiting pins. When the conical tube moves horizontally, the limiting pins move along the sliding groove, thereby realizing axial movement and extruding the thin tube.

[0036] In this embodiment, a connecting block 13 is provided between the fixed seat and the thin-walled tube, so that the thin-walled tube and the fixed seat form a whole, and the two have the same movement. Due to the limitation of the sliding groove, the relative freedom between the thin-walled tube and the tapered tube is also limited, so that the thin-walled tube and the fixed seat have the function of axial movement to achieve expansion.

[0037] In this embodiment, three driving rods are arranged along the circumference of the support ring, and the contact surfaces of the three driving rods and the support ring are provided with expansion bearing pieces 14, which are arc-shaped pieces matching the shape of the support ring. The arc-shaped piece has a certain length, and when the force acting on the driving rod acts on the arc-shaped piece, an expansion force can be formed on the support ring in the area at the same time, which is a surface force rather than a collective force, so that the load is more uniform and the pulling effect is better.

[0038] In this embodiment, the support ring includes a tube body 15 and a strip body 16. Both the tube body and the strip body are made of elastic materials such as spring steel, beryllium bronze, etc., and the tail of the strip body can be inserted into the tube body to form a ring shape.

[0039] Furthermore, in order to prevent the elongated body from withdrawing from the tube body under the action of elastic force, a damping membrane 20 is provided on the surface of the elongated body in this embodiment, such as a membrane made of rubber, silicone, etc., which has great deformation ability and can prevent the elongated body from withdrawing from the tube body, so that the support ring can maintain a circular state.

[0040] In this embodiment, it is also necessary to ensure that the resistance is not greater than the driving force brought by the support adjuster, so as to ensure that the long strip can easily exit the tube under the action of the driving force.

[0041] In this embodiment, the thin-walled tube is also made of elastic materials such as spring steel, beryllium bronze, etc., and a plurality of long holes 17 arranged along the axial direction are provided on the surface so that it can expand under the action of radial force. The opening directions of any two adjacent long holes in the plurality of long holes are opposite, so that the expansion resistance at both ends or any position of the thin-walled tube is consistent, thereby ensuring the expansion level.

[0042] In this embodiment, a flow sensor 18 and a signal transmitter 19 are provided at the front end of the fixing seat. The flow sensor is used to measure the blood flow per unit time, and the signal transmitter can be a processing chip with a Bluetooth module for wirelessly transmitting the blood flow signal to an external terminal.

[0043] When in use, the present invention can be placed at the lesion site under the guidance of ultrasound through interventional surgery. After completion, the blood flow in the stent can be checked through an external terminal and compared with the original situation. If no obvious improvement is found, an external magnetic field, an alternating magnetic field, and the NS poles can be continuously changed to cause the permanent magnet to rotate, thereby driving the support regulator to work and achieve adjustment of the stent body. At the same time, after a period of use, if the flow rate is found to have dropped significantly, the permanent magnet can be started again to adjust to the predetermined value.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. An adjustable vascular stent, comprising a stent body, characterized in that: The support adjuster is also provided in the support body, and the support adjuster includes a support ring supported on the inner wall of the support body, a driving rod radially provided on the inner wall of the support ring, an expansion cylinder provided at the end of the driving rod, an extrusion cylinder coaxially provided in the expansion cylinder, and a driving shaft coaxially provided in the extrusion cylinder, wherein the driving shaft is connected to the extrusion cylinder by a threaded pair, a permanent magnet is provided at one end of the driving shaft, and a fixed seat is provided at the other end, the expansion cylinder is a thin-walled cylinder, and the extrusion cylinder is a conical cylinder, the permanent magnet can rotate under the action of external magnetic force, and drives the driving shaft to rotate, the fixed seat is provided in a rotating space, and the driving shaft is inserted into the rotating space to realize the rotational freedom, and drives the conical cylinder to move horizontally to extrude the expansion cylinder, thereby causing the expansion cylinder to expand outward, and then the driving rod is radially extended, driving the inner diameter of the support ring to expand, and expanding the support body.

2. The adjustable vascular stent according to claim 1, characterized in that: The conical tube is provided with a plurality of limit pins arranged along the axial direction in the radial direction, and the thin-walled tube is provided with a sliding groove for the axial movement of the limit pins.

3. The adjustable vascular stent according to claim 1, characterized in that: A connecting block is arranged between the fixing seat and the thin-walled tube.

4. The adjustable vascular stent according to claim 1, characterized in that: Three driving rods are arranged along the circumference of the support ring, and expansion bearing sheets are arranged on the contact surfaces between the three driving rods and the support ring. The expansion bearing sheets are arc-shaped sheets that match the shape of the support ring.

5. The adjustable vascular stent according to claim 1, characterized in that: The support ring includes a tube body and a strip body, both of which are made of elastic material, and the tail of the strip body can be inserted into the tube body to form a circular ring shape.

6. The adjustable vascular stent according to claim 5, characterized in that: A damping film is arranged on the surface of the elongated body so as to prevent the elongated body from exiting the tube body and keep the supporting ring in a circular shape.

7. The adjustable vascular stent according to any one of claims 1 to 6, characterized in that: The thin-walled tube is made of elastic material and has a plurality of long holes arranged along the axial direction on the surface.

8. The adjustable vascular stent according to claim 7, characterized in that: The opening directions of any two adjacent long strip holes among the plurality of long strip holes are opposite.

9. The adjustable vascular stent according to any one of claims 1 to 6, characterized in that: A flow sensor and a signal transmitter are arranged at the front end of the fixing seat. The flow sensor is used to measure the blood flow per unit time, and the signal transmitter is used to wirelessly transmit the blood flow signal.

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