CN215875107U - Drug-coating stent capable of being withdrawn - Google Patents
Drug-coating stent capable of being withdrawn Download PDFInfo
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- CN215875107U CN215875107U CN202122114161.1U CN202122114161U CN215875107U CN 215875107 U CN215875107 U CN 215875107U CN 202122114161 U CN202122114161 U CN 202122114161U CN 215875107 U CN215875107 U CN 215875107U
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Abstract
The utility model provides a drug coating stent capable of being withdrawn, which belongs to the technical field of medical instruments and comprises: the inner tube and the outer tube are sleeved on the inner tube in a sliding manner, and the near ends of the inner tube and the outer tube are connected with pushing devices; the distal end of the inner tube has a tip; the surface of the self-expansion type bracket is provided with a drug coating; the self-expansion type bracket is sleeved on the inner pipe; the self-expansion type stent is accommodated in a furled state in the outer tube, the self-expansion type stent is separated from the limit of the outer tube, self-expands to an expanded state which adheres to the wall of a blood vessel and expands target lesion, and the pushing device drives the inner tube and the outer tube to mutually slide so that the self-expansion type stent is switched between the furled state and the expanded state. The drug-coated stent capable of being withdrawn provided by the utility model is not remained in vivo, and meanwhile, the mode can not block blood flow, can also control the administration time, and is simple and convenient in the whole operation process and easy to operate.
Description
Technical Field
The utility model relates to the technical field of medical instruments, in particular to a stent with a drug coating capable of being withdrawn.
Background
At present, the intracavity interventional therapy becomes the first choice treatment means of lower limb arteriosclerosis obliterans, and more medicine-carrying apparatuses are reported to be applied to the treatment of the lower limb arteriosclerosis obliterans in recent years, such as medicine eluting stents, medicine coating balloons and the like. Compared with the traditional balloon forming operation and a metal bare stent, the drug eluting stent and the drug coating balloon can effectively improve the smooth rate of target lesion.
Wherein, the drug eluting stent can be permanently remained in the body when in use, and the physiological load of the artery of the lower limb is complex, the fracture rate of the stent is high, the secondary intracavity intervention operation is difficult, and the choice is small. Although the number of implanted stents can be reduced by the drug-coated balloon, the drug-coated balloon has large dosage and low drug utilization rate, and the drug-coated balloon needs to block blood flow when being expanded for administration, so that the adherence time and the drug absorption rate of the drug-coated balloon are limited.
SUMMERY OF THE UTILITY MODEL
Therefore, the utility model aims to solve the technical problems that the drug eluting stent in the prior art is easy to break in vivo, the drug coating balloon has large dosage and low drug utilization rate, and the drug coating balloon needs to block blood flow during expansion administration, so that the adherence time and the drug absorption rate of the drug coating balloon are limited, thereby providing the recoverable drug coating stent.
To solve the above technical problems, the present invention provides a drug-coating-retrievable stent, comprising:
the inner tube and the outer tube are sleeved on the inner tube in a sliding manner, and the near ends of the inner tube and the outer tube are connected with pushing devices;
the distal end of the inner tube has a tip, and the distal end of the outer tube is suitable for being arranged in contact with the tip;
the surface of the self-expansion type stent is provided with a drug coating, and one end of the self-expansion type stent close to the near end of the inner tube is fixedly connected to the inner tube and is positioned at the far end of the inner tube;
the self-expansion type bracket is sleeved on the inner pipe;
the self-expansion type stent is accommodated in a furled state in the outer tube, and the self-expansion type stent is separated from the limit of the outer tube, self-expands to an expanded state which adheres to the wall of a blood vessel and expands to target lesion, and the pushing device drives the inner tube and the outer tube to mutually slide so that the self-expansion type stent is switched between the furled state and the expanded state.
Optionally, the pushing device includes:
the first pipe seat is connected with the near end of the inner pipe;
and the second pipe seat is connected with the outer pipe, and the inner pipe penetrates through the second pipe seat and is arranged in the outer pipe in a penetrating manner.
Optionally, the self-expandable stent is a NiTi shape memory alloy.
Optionally, the self-expanding stent is a tubular cutting stent.
Optionally, the self-expanding stent is a tubular braided stent.
Optionally, the self-expansion type stent further comprises a fixed seat fixedly connected to the distal end of the inner tube, and the end of the self-expansion type stent is fixedly mounted on the fixed seat.
Optionally, the device further comprises a flushing port arranged on the second pipe seat, and the flushing port is communicated with the outer pipe.
Optionally, the self-expandable stent further comprises a development mark, which is arranged on the inner tube and is positioned at the end part of the self-expandable stent.
Optionally, the visualization marker has two, one at an end of the self-expanding stent near the distal end of the inner tube;
the other is located at an end position of the self-expanding stent near the proximal end of the inner tube.
The technical scheme of the utility model has the following advantages:
1. the retractable drug-coated stent provided by the utility model has the advantages that the outer tube is slidably sleeved on the inner tube, the self-expansion stent is fixedly connected to the inner tube, the drug coating is arranged on the self-expansion stent, the self-expansion stent is in a furled state before the drug-coated stent reaches a lesion position, and the far end of the outer tube is in contact with the tip end of the inner tube; when the drug-coated stent reaches the lesion position, the pushing device is controlled to enable the inner tube and the outer tube to slide mutually, in the process that the outer tube slides relative to the inner tube, the outer tube gradually releases the self-expansion stent, the self-expansion stent is switched from a folded state to an expanded state, the self-expansion stent is separated from the limit of the outer tube, and the self-expansion stent automatically expands to be attached to the vascular wall and expand a target lesion, so that the drug is released; after the drug is released, the inner tube is drawn out in the process that the inner tube slides relative to the outer tube, the position of the outer tube is kept unchanged, the end part of the self-expansion type support is fixedly connected to the inner tube, the self-expansion type support is driven to move together in the process that the inner tube is drawn out, the self-expansion type support is folded into the outer tube again when meeting the end part of the outer tube, the outer tube enters a folded state, the inner tube is continuously drawn out, and the outer tube is driven to move together under the action of the tip. The drug-coated stent can not be retained in vivo, and meanwhile, the mode can not block blood flow, can also control the administration time, and has simple and convenient whole operation process and easy operation.
2. The retractable drug-coated stent provided by the utility model comprises a pushing device and a pushing device, wherein the pushing device comprises a first tube seat and a second tube seat, the first tube seat is connected with the near end of an inner tube, the second tube seat is connected with the near end of an outer tube, and the inner tube and the outer tube can slide mutually by controlling the first tube seat and the second tube seat.
3. The retractable drug-coated stent provided by the utility model is characterized in that the second tube seat is provided with a flushing port, the flushing port is communicated with the outer tube, and physiological saline can be injected through the flushing port to remove air.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural view of a stent coated with a retractable drug according to the present embodiment of the utility model;
FIG. 2 is a schematic structural view of a first embodiment of a self-expanding stent in a stent with a drug coating for withdrawal provided by the present invention;
fig. 3 is a schematic structural view of a second embodiment of a self-expandable stent in a stent with a drug coating capable of being withdrawn provided by the present invention.
Description of reference numerals:
1. a tip; 2. a self-expanding stent; 3. an outer tube; 4. flushing the opening; 5. an inner tube; 6. a fixed seat; 7. a first stem; 8. a second stem.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The present embodiment provides a specific embodiment of the retractable drug-coated stent, as shown in fig. 1, the pushing device comprises a first tube seat 7 and a second tube seat 8, the first tube seat 7 is connected with the proximal end of the inner tube 5, the second tube seat 8 is connected with the proximal end of the outer tube 3, the inner tube 5 penetrates through the second tube seat 8 and is arranged in the outer tube 3, and the mutual sliding between the inner tube 5 and the outer tube 3 can be realized by controlling the first tube seat 7 and the second tube seat 8 through the pushing device.
In the embodiment, the proximal end of the inner tube 5 is connected to the first tube seat 7, and the distal end is provided with the tip 1; the outer tube 3 of the outer tube 3 is sleeved on the inner tube 5 in a sliding mode, the near end of the outer tube 3 is connected to the second tube seat 8, and the end portion of the far end can be arranged in contact with the tip 1. The self-expansion type stent 2 is fixedly connected to the far end of the inner tube 5, one end, close to the near end of the inner tube 5, of the self-expansion type stent 2 is fixedly connected to the inner tube 5, a drug coating is arranged on the self-expansion type stent 2, the self-expansion type stent 2 is in a furled state before the drug coating stent reaches a lesion position, the far end of the outer tube 3 is arranged in a contact mode with the tip 1 on the inner tube 5, and the self-expansion type stent 2 is furled in the outer tube 3; when the drug-coated stent reaches the lesion position, the position of the inner tube 5 is kept unchanged, the second tube holder 8 is controlled, the outer tube 3 is pulled outwards, the outer tube 3 slides relative to the inner tube 5, the outer tube 3 gradually releases the self-expanding stent 2 until the self-expanding stent 2 is completely released, the self-expanding stent 2 is switched from the folded state to the expanded state, the self-expanding stent 2 is separated from the limit of the outer tube 3 at the moment, and self-expands to be attached to the vascular wall and expand the target lesion, and the drug is released; after the drug is released, the position of the outer tube 3 is kept unchanged, the first tube seat 7 is controlled, the inner tube 5 is pulled outwards, in the process that the inner tube 5 slides relative to the outer tube 3, the inner tube is fixedly connected to the inner tube 5 due to the end part of the self-expansion type support 2, the self-expansion type support 2 is driven to move together in the process that the inner tube 5 is pulled out, when the self-expansion type support 2 meets the end part of the outer tube 3, the self-expansion type support is folded into the outer tube 3 again and enters a folded state until the tip 1 is in contact with the end part of the outer tube 3, the inner tube 5 is continuously pulled out, the outer tube 3 is driven to move together under the action of the tip 1, and the drug administration process to the target lesion position is completed. The drug-coated stent is not retained in vivo, and meanwhile, the self-expandable stent 2 can not block blood flow in an expanded state, so that long-time administration can be performed, the drug absorption rate is improved, and the elastic contraction of blood vessels is reduced. The stent is not retained in the body, so that the occurrence of easy fracture of the stent retained in the body is avoided; meanwhile, the stent is positioned in the outer tube 3 in the conveying and withdrawing processes, so that the drug loss in the conveying and withdrawing processes is avoided.
In this embodiment, the second tube holder 8 is provided with a flushing port 4, the flushing port 4 is communicated with the outer tube 3, and the flushing port 4 can inject physiological saline to remove air.
As shown in fig. 2, the far end of the inner tube 5 is provided with a fixed seat 6, the left end of the self-expansion type support 2 is fixedly connected to the fixed seat 6, the self-expansion type support 2 is made of NiTi shape memory alloy, and a tubular cutting support is adopted.
As an alternative embodiment, the self-expanding stent 2 may also be a tubular braided stent, as shown in fig. 3.
In this embodiment, two development markers are provided at the distal end of the inner tube 5, and are located at positions on both sides of the drug-coated portion of the self-expandable stent 2, and an operator can observe the positions of the drug-coated stent in the blood vessel through the development markers.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are intended to be within the scope of the utility model.
Claims (9)
1. A retrievable drug-coated stent, comprising:
the inner tube (5) and the outer tube (3) are sleeved on the inner tube (5) in a sliding mode, and the near ends of the inner tube (5) and the outer tube (3) are connected with pushing devices;
the distal end of the inner tube (5) is provided with a tip (1), and the distal end of the outer tube (3) is suitable for being arranged in contact with the tip (1);
the surface of the self-expansion type stent (2) is provided with a drug coating, and one end, close to the near end of the inner tube (5), of the self-expansion type stent (2) is fixedly connected to the inner tube (5) and is positioned at the far end of the inner tube (5);
the self-expansion type bracket (2) is sleeved on the inner pipe (5);
from inflation formula support (2) have accomodate in the folded state in outer tube (3), from inflation formula support (2) still have and break away from outer tube (3) restriction expands by oneself to adhere to the wall of a blood vessel and expand to the expansion state of target pathological change, pusher drive when inner tube (5) and outer tube (3) slide each other, make from inflation formula support (2) switch between folded state and expansion state.
2. The retractable drug-coated stent of claim 1, wherein the pushing means comprises:
the first pipe seat (7) is connected with the near end of the inner pipe (5);
and the second pipe seat (8) is connected with the outer pipe (3), and the inner pipe (5) penetrates through the second pipe seat (8) and is arranged in the outer pipe (3) in a penetrating manner.
3. The retractable drug coated stent of claim 1 wherein the self-expandable stent (2) is a NiTi shape memory alloy.
4. The retractable drug-coated stent of claim 1 wherein the self-expandable stent (2) is a tubular cut stent.
5. The retractable drug-coated stent of claim 1 wherein the self-expandable stent (2) is a tubular braided stent.
6. The stent with a drug coating capable of being withdrawn according to claim 1, further comprising a fixing base (6) fixedly connected to the distal end of the inner tube (5), wherein the end of the self-expandable stent (2) is fixedly mounted on the fixing base (6).
7. The drug-coated stent of claim 2, further comprising a flushing port (4) disposed on the second tube seat (8), the flushing port (4) being in communication with the outer tube (3).
8. The retractable drug-coated stent of claim 1 further comprising visualization markers disposed on the inner tube (5) and at the ends of the self-expanding stent (2).
9. The retractable drug-coated stent of claim 8 wherein the visualization marker has two, one at the end of the self-expanding stent (2) near the distal end of the inner tube (5);
the other one is located at the end position of the self-expanding stent (2) near the proximal end of the inner tube (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122114161.1U CN215875107U (en) | 2021-09-02 | 2021-09-02 | Drug-coating stent capable of being withdrawn |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122114161.1U CN215875107U (en) | 2021-09-02 | 2021-09-02 | Drug-coating stent capable of being withdrawn |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215875107U true CN215875107U (en) | 2022-02-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122114161.1U Active CN215875107U (en) | 2021-09-02 | 2021-09-02 | Drug-coating stent capable of being withdrawn |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215875107U (en) |
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2021
- 2021-09-02 CN CN202122114161.1U patent/CN215875107U/en active Active
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