CN114652496A - Blood vessel stent, blood vessel stent system, method for transporting blood vessel stent, and method for recovering or adjusting position of blood vessel stent - Google Patents
Blood vessel stent, blood vessel stent system, method for transporting blood vessel stent, and method for recovering or adjusting position of blood vessel stent Download PDFInfo
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- CN114652496A CN114652496A CN202011528051.3A CN202011528051A CN114652496A CN 114652496 A CN114652496 A CN 114652496A CN 202011528051 A CN202011528051 A CN 202011528051A CN 114652496 A CN114652496 A CN 114652496A
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- stent
- balloon
- vascular stent
- blood vessel
- vascular
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- BSYNRYMUTXBXSQ-UHFFFAOYSA-N Aspirin Chemical compound CC(=O)OC1=CC=CC=C1C(O)=O BSYNRYMUTXBXSQ-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/86—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
- A61F2/90—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure
- A61F2/91—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/95—Instruments specially adapted for placement or removal of stents or stent-grafts
- A61F2/958—Inflatable balloons for placing stents or stent-grafts
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/95—Instruments specially adapted for placement or removal of stents or stent-grafts
- A61F2/962—Instruments specially adapted for placement or removal of stents or stent-grafts having an outer sleeve
- A61F2/966—Instruments specially adapted for placement or removal of stents or stent-grafts having an outer sleeve with relative longitudinal movement between outer sleeve and prosthesis, e.g. using a push rod
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/95—Instruments specially adapted for placement or removal of stents or stent-grafts
- A61F2/962—Instruments specially adapted for placement or removal of stents or stent-grafts having an outer sleeve
- A61F2/97—Instruments specially adapted for placement or removal of stents or stent-grafts having an outer sleeve the outer sleeve being splittable
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/95—Instruments specially adapted for placement or removal of stents or stent-grafts
- A61F2002/9528—Instruments specially adapted for placement or removal of stents or stent-grafts for retrieval of stents
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2210/00—Particular material properties of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2210/0014—Particular material properties of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof using shape memory or superelastic materials, e.g. nitinol
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2210/00—Particular material properties of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2210/0061—Particular material properties of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof swellable
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2210/00—Particular material properties of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2210/0066—Particular material properties of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof shrinkable
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2250/0058—Additional features; Implant or prostheses properties not otherwise provided for
- A61F2250/0096—Markers and sensors for detecting a position or changes of a position of an implant, e.g. RF sensors, ultrasound markers
- A61F2250/0098—Markers and sensors for detecting a position or changes of a position of an implant, e.g. RF sensors, ultrasound markers radio-opaque, e.g. radio-opaque markers
Landscapes
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Cardiology (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Transplantation (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Media Introduction/Drainage Providing Device (AREA)
- Prostheses (AREA)
Abstract
The invention provides a vascular stent, a vascular stent system, a method for delivering the vascular stent, and a method for recovering or adjusting the position of the vascular stent. The vascular stent is switchable between a compressed state and an expanded state in a first temperature range. Maintaining the compressed shape memory state in a second temperature range. When the blood vessel stent is recovered or adjusted, liquid and/or gas with a second temperature is introduced into the balloon so as to expand the balloon to be in contact with the blood vessel stent. The vascular stent is in a compressed state under the influence of temperature after contacting the saccule, partial liquid and/or gas are released to shrink the saccule, so that the vascular stent is compressed to a compressed state capable of being attached to the outer surface of the saccule, and the vascular stent moves synchronously along with the saccule to recover or adjust the vascular stent. Therefore, the invention realizes the recovery or position adjustment of the blood vessel stent by utilizing the state characteristics of the blood vessel stent at the first temperature and the second temperature, thereby relieving the complications caused by the unrecyclable or unadjustable blood vessel stent.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to a vascular stent, a vascular stent system, a vascular stent conveying method and a recovery or position adjustment method.
Background
Cerebrovascular stenosis is an important cause and risk factor for ischemic cerebrovascular diseases. Cerebrovascular stenosis reduces the blood flow through the brain vessels and the brain cells die due to ischemia. The treatment method of the cerebral artery stenosis comprises three methods of medicament treatment, surgical operation treatment and vascular stent treatment. If the lumen stenosis is less than 50%, we can take medication, mainly probucol (P), aspirin (A), and statin (S), which is abbreviated as PAS therapy. If the vessel is narrowed by more than 50 percent of the vessel diameter, carotid intimal stripping operation or a vessel stent is placed in the narrowed vessel to enlarge the vessel cavity, thereby achieving the treatment purpose. The endovascular stent therapy has wide application, and compared with carotid intimal denudation surgery, the stent therapy has the main advantages of small wound on patients and capability of treating multiple stenosis lesions at the same time, so that the stent is particularly suitable for patients who cannot tolerate or refuse surgery, have recurrent vascular stenosis after surgery, multiple vascular stenosis and can not reach the stenosis part surgery.
Stents are generally unrecoverable and unretractable after placement, easily leading to complications. In this regard, patients often need to take antiplatelet drugs for a lifetime, and trauma often results in non-constant blood flow and other injuries to the patient. In addition, ischemic complications such as late luminal loss, intimal hyperplasia, etc. may also occur in some patients.
Therefore, there is a need for a vascular stent capable of retrieval or position adjustment to solve the above problems.
Disclosure of Invention
The invention aims to provide a vascular stent, a vascular stent system, a vascular stent conveying method and a recovery or position adjustment method, so as to solve the problem of how to realize the recovery and position adjustment of the vascular stent.
In order to solve the technical problem, the invention provides a blood vessel support which is of a tubular structure and is switched between a compression state and an expansion state in a first temperature range; in a second temperature range, the vascular stent maintains a compressed shape memory state, and a maximum temperature of the first temperature range is less than a minimum temperature of the second temperature range.
Optionally, in the blood vessel stent, the first temperature range is less than 40 ℃.
Optionally, in the blood vessel stent, the second temperature range is greater than or equal to 40 ℃.
Optionally, in the vascular stent, a material of the vascular stent includes nitinol.
Optionally, in the vascular stent, the vascular stent is in a net structure and is formed by cutting a tube or weaving a metal wire.
Optionally, in the blood vessel stent, a plurality of first visualization markers are arranged on the blood vessel stent, and the first visualization markers are visible under X-rays.
Optionally, in the blood vessel stent, the first visualization mark is a metal wire or a metal tube, and is fixed at a preset position on the blood vessel stent.
Optionally, in the blood vessel stent, a material of the first imaging marker includes at least one of platinum, gold, and silver.
Based on the same inventive concept, the present invention also provides a vascular stent system, comprising: the balloon conveyor comprises a balloon and an outer tube connected with the balloon; and
the blood vessel support is sleeved on the outer surface of the saccule.
Optionally, in the vessel stent system, the balloon has two opposite ends, and both ends are connected with the outer tube, so that the balloon is communicated with the outer tube.
Optionally, in the vessel stent system, the balloon conveyor further comprises an inner tube, and the inner tube is arranged through the outer tube and the balloon.
Optionally, in the vessel stent system, the balloon conveyor further comprises a plurality of second visualization markers; the second developing mark is fixedly arranged on the inner tube and is positioned in the saccule.
Optionally, in the blood vessel stent system, the second visualization mark is a wire or a metal tube, and the material includes: at least one of platinum, gold and silver.
Optionally, in the vessel stent system, the balloon has two states of contraction and expansion.
Based on the same inventive concept, the invention also provides a method for conveying the vascular stent, which comprises the following steps:
within a first temperature range, the intravascular stent is in a compressed state and is sleeved on the outer surface of the balloon;
synchronously moving the vascular stent and the balloon to a target position;
introducing liquid and/or gas in the first temperature range into the outer tube to expand the balloon and drive the vascular stent to expand to a preset expansion state;
releasing a portion of the liquid and/or the gas in the outer tube to deflate the balloon and detach from the vascular stent.
Optionally, in the method for delivering the blood vessel stent, after the blood vessel stent is separated from the balloon, the balloon conveyor is withdrawn.
Optionally, in the method for delivering the blood vessel stent, the liquid is a contrast medium or saline.
Based on the same inventive concept, the invention also provides a method for recovering or adjusting the position of the blood vessel stent, which comprises the following steps:
conveying the saccule to the position of the blood vessel bracket and penetrating the saccule into the blood vessel bracket;
passing a liquid and/or gas at a second temperature range into the outer tube to inflate the balloon into contact with the vascular stent;
releasing a portion of the liquid and/or the gas in the outer tube to deflate the balloon, thereby compressing the stent-graft to a compressed state capable of adhering to an outer surface of the balloon;
and moving the balloon to enable the vascular stent to move synchronously with the balloon.
Optionally, in the method for retrieving or adjusting the position of the blood vessel stent, the liquid is a contrast medium or saline.
In summary, the present invention provides a vascular stent, a vascular stent system, a method for delivering the vascular stent, and a method for recovering or adjusting the position of the vascular stent. The stent is a tubular structure and is switched between a compressed state and an expanded state in a first temperature range. In a second temperature range, the vascular stent maintains a compressed shape memory state, and a maximum temperature of the first temperature range is less than a minimum temperature of the second temperature range. The intravascular stent realizes conveying, recovery or position adjustment under the matching use of the balloon conveyor. When the intravascular stent is conveyed, the intravascular stent in a compressed state is firstly placed on the outer surface of the balloon at a first temperature. Then, the balloon and the vascular stent are delivered to a target position. And secondly, introducing liquid and/or gas to expand the saccule so as to drive the vascular stent to expand. And when the vascular stent is expanded to a preset expansion state, releasing partial liquid and/or gas to enable the saccule to shrink and separate from the vascular stent, so that the vascular stent is conveyed.
When the blood vessel stent is recovered or adjusted, the saccule is firstly conveyed into the blood vessel stent, and then liquid and/or gas with a second temperature is introduced into the saccule so that the saccule is expanded to be in contact with the blood vessel stent. The intravascular stent is in a compressed state under the influence of temperature after contacting the balloon, and then part of the liquid and/or gas is released to shrink the balloon, so that the intravascular stent is compressed to a compressed state which can be attached to the outer surface of the balloon. And finally, moving the balloon to enable the vascular stent to synchronously move along with the balloon so as to realize the recovery or position adjustment of the vascular stent. Therefore, the invention utilizes the state characteristics of the blood vessel stent at the first temperature and the second temperature to realize the recovery or position adjustment of the blood vessel stent, thereby being capable of relieving the complications caused by the irrecoverable or unadjustable implanted blood vessel stent.
Drawings
FIG. 1 is a schematic structural view of a vascular stent in accordance with an embodiment of the present invention;
FIG. 2 is a schematic diagram of a balloon transporter in accordance with an embodiment of the invention;
FIG. 3 is a schematic structural diagram of the connection of the blood vessel stent and the balloon conveyor of the embodiment of the invention;
in the figure:
10-a vascular stent; 101-a wire; 102-a first developed mark;
20-a balloon transporter; 201-balloon; 202-outer tube; 203-an inner tube; 204-second development mark.
Detailed Description
To further clarify the objects, advantages and features of the present invention, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. It is to be noted that the drawings are in simplified form and are not to scale, but are provided for the purpose of facilitating and clearly illustrating embodiments of the present invention. Further, the structures illustrated in the drawings are often part of actual structures. In particular, the drawings may have different emphasis points and may sometimes be scaled differently. It should be further understood that the terms "first," "second," "third," and the like in the description are used for distinguishing between various components, elements, steps, and the like, and are not intended to imply a logical or sequential relationship between various components, elements, steps, or the like, unless otherwise indicated or indicated.
To solve the above technical problem, the present embodiment provides a blood vessel stent 10, referring to fig. 1, the blood vessel stent 10 is a tubular structure and is switched between a compressed state and an expanded state in a first temperature range. The stent maintains a compressed shape memory state over a second temperature range. And the maximum temperature of the first temperature range is less than the minimum temperature of the second temperature range. Specifically, the range of the first temperature includes: less than 40 degrees celsius. For example, the human body has normal axillary temperature (36 to 37.3 degrees celsius) and below. At the first temperature, the stent 10 is in a martensitic state, in which the stent 10 can be switched between a compressed state and an expanded state by an external force. The second temperature range includes: greater than or equal to 40 degrees celsius. Optionally, the stent 10 is in an austenitic state at between 40 degrees celsius and 45 degrees celsius, in which state the stent 10 maintains a compressed shape memory state.
Further, the material of the blood vessel stent 10 includes nitinol. The intravascular stent 10 is of a net structure and is formed by cutting a pipe or weaving a metal wire 101. The stent 10 shown in fig. 1 is a mesh structure woven by metal wires 101, and optionally, is woven by at least one metal wire 101, and the formed mesh is rhombic, rectangular or hexagonal, etc. In addition, the vascular stent 10 with a net structure can be obtained by means of laser cutting of a metal pipe.
A plurality of first visualization markers 102 are further disposed on the blood vessel stent 10, and the first visualization markers 102 are visible under X-rays, so that a doctor can conveniently determine the position of the blood vessel stent 10 during an operation. Optionally, the first development mark 102 is a metal wire or a metal tube, and the material of the first development mark includes a non-transmissive metal material or a non-transmissive polymer material, such as platinum, gold, or silver. When the first visualization mark 102 is a metal wire, it can be fixed on the blood vessel stent 10 in a winding manner, and when the first visualization mark 102 is a metal tube, it can be fixed on the blood vessel stent 10 in an adhesion or welding manner. The positions of the first visualization markers 102 can be arranged at both ends of the blood vessel stent 10, or at the middle part of the blood vessel stent, or at other preset positions. The first visualization marks 102 shown in fig. 1 are 4, and each of the first visualization marks 2 is disposed at both ends of the stent 10. Optionally, the number of the first development marks 102 is 6, 8, 10, 12, or 16, and the like, and the number of the first development marks 102 is not limited in this embodiment, and may be set as needed.
Based on the same inventive concept, the present embodiment further provides a stent system, please refer to fig. 2-3, the stent system includes: a balloon conveyor 20 and the vascular stent 10. As shown in fig. 2, the balloon transporter 20 includes a balloon 201, an inner tube 203, and an outer tube 202. The balloon 201 has a cavity and the balloon 201 has two states, deflated and inflated. I.e. the balloon 201 can be deflated or inflated by external forces. The balloon 201 has two opposite end portions and a middle portion, the two end portions are hermetically connected with the middle portion, and are in a tapered structure, that is, the diameters of the two end portions are smaller than that of the middle portion. The balloon 201 is made of medical polymer material, such as polyamide polymer material, modified polyamide polymer material or polymer composite material.
The outer tube 202 is a hollow tubular structure. The outer tube 202 is fixedly connected with two ends of the balloon 201, and the specific connection mode can be selected as follows: thermal welding or laser welding, etc. The outer tube 202 and the balloon 201 are communicated with each other, and a first interface (not shown) is further connected to a proximal end portion of the outer tube 202, through which gas and/or liquid can be introduced or released into the outer tube 202 and the balloon 201, so that the balloon 201 contracts or expands under the action of the gas and/or liquid. The inner tube 203 is also a hollow tubular structure, and the inner tube 203 can be inserted through the outer tube 202 and the balloon 201. A second port (not shown) is connected to the proximal end of the inner tube 203, and is used for passing a guide wire (not shown). In the operation of implanting the blood vessel stent 10, the physician can firstly thread one end of the guide wire into the vascular lesion of the patient, and then thread the other end of the guide wire into the port of the inner tube 203 close to the balloon 201 side, and thread out from the second port. The physician can push the balloon 201 along the guide wire to the vascular lesion to facilitate the delivery or movement of the stent 10.
The intravascular stent 10 can be sleeved on the outer surface of the balloon 201. The intravascular stent 10 can generate interaction force with the balloon 201 in a contracted state and is attached to the outer surface of the balloon 201. And the outer surface of the balloon 201 has certain roughness, so that the intravascular stent 10 can be ensured not to displace from the outer surface of the balloon 201 in the conveying process under the blocking of friction force.
Further, the balloon 201 transporter 20 further comprises a plurality of second visualization marks 204. The second visualization mark 204 is fixedly disposed on the inner tube 203 and is located inside the balloon 201. Referring to fig. 3, the setting position of the second development mark 204 corresponds to the setting position of the first development mark 102. That is, when the first visualization mark 102 is disposed at a predetermined position such as at the two ends or the middle of the blood vessel stent 10, the second visualization mark 204 is disposed at a position where the first visualization mark 102 is projected on the inner tube 203 in the balloon 201 when the blood vessel stent 10 is located on the balloon 201. The purpose is to determine the position relationship between the stent 10 and the balloon 201 by determining whether the first visualization mark 102 and the second visualization mark 204 are aligned in the direction perpendicular to the inner tube 203 when the stent 10 is implanted or recovered. When the first visualization mark 102 and the second visualization mark 204 are aligned in the direction perpendicular to the inner tube 203, it can be determined that the blood vessel stent 10 entirely covers the outer surface of the balloon 201, and then the movement, the recovery or the implantation can be performed. If not, the position between the intravascular stent 10 and the balloon 201 needs to be further adjusted to avoid the problems of falling off and the like in the implantation or recovery process, increase the complexity of the operation or cause the failure of the operation. The second development mark 204 is made of the same material and has the same shape as the first development mark 102. Optionally, the second developing mark 204 is a metal wire or a metal tube, and the material includes: platinum, gold or silver. The second development mark 204 is fixed to the inner tube 203 by heat welding or laser welding, or the like.
Based on the same inventive concept, the present embodiment further provides a method for delivering a blood vessel stent 10, referring to fig. 1 to 3, the method for delivering a blood vessel stent 10 includes:
the method comprises the following steps: at a first temperature, the vessel stent 10 is in a compressed state and is sleeved on the outer surface of the balloon 201.
Specifically, since the vessel stent 10 can be compressed or expanded by the external force at the first temperature, the vessel stent 10 can be disposed on the outer surface of the balloon 201 in a pressing and holding manner, so that the vessel stent 10 is attached to the outer surface of the balloon 201, and the vessel stent 10 and the balloon 201 can move synchronously. Meanwhile, it is necessary to ensure that the first development mark 102 and the second development mark are aligned in a direction perpendicular to the inner tube 203.
Step two: the vessel stent 10 and the balloon 201 are synchronously moved to the target position.
Optionally, the balloon conveyor 20 is pushed to enable the vessel stent 10 to move to the lesion of the vessel synchronously under the support of the balloon 201.
Step three: liquid and/or gas with a first temperature is introduced into the outer tube 202 to expand the balloon 201 and drive the blood vessel stent 10 to expand to a preset expansion state.
Wherein the liquid is optionally a contrast agent or saline. Preferably, a contrast agent is introduced to facilitate a clear understanding of the expansion of the stent 10. The balloon 201 can be gradually expanded due to the introduction of the liquid and/or the gas, and at the first temperature, the blood vessel stent 10 can be expanded along with the expansion of the balloon 201, so that the blood vessel stent 10 can be opened at a lesion to expand a blood vessel. When the preset expansion state is reached, the liquid and/or gas can be stopped from being introduced, so that the balloon 201 drives the vascular stent 10 to continue to expand to avoid injury to the blood vessel.
Step four: releasing part of the liquid and/or the gas in the outer tube 202 to make the balloon 201 shrink and detach from the blood vessel stent 10.
When a preset inflation state is reached, the liquid and/or the gas can be gradually released, so that the balloon 201 is gradually contracted. Since the vessel stent 10 changes its shape under the action of the external force at the first temperature, when the balloon 201 is contracted, no external force is applied to the vessel stent 10, the vessel stent 10 maintains the expanded state, and the balloon 201 is separated from the vessel stent 10. After detachment, the balloon conveyor 20 may be withdrawn, i.e., implantation of the stent 10 is completed.
Based on the same inventive concept, the present embodiment further provides a method for retrieving or adjusting the position of the blood vessel stent 10, please continue to refer to fig. 1-3, the method for retrieving or adjusting the position of the blood vessel stent 10 includes:
the method comprises the following steps: the balloon 201 is conveyed to the position of the blood vessel stent 10 and is arranged in the blood vessel stent 10 in a penetrating way.
The balloon 201 is pushed so that the second visualization mark 204 is aligned with the first visualization mark 102 on the stent 10 in a direction perpendicular to the inner tube 203. The purpose is to ensure that the contact surface area of the blood vessel stent 10 and the balloon 201 is maximized in the process of recovering, and to avoid the blood vessel stent 10 from separating from the balloon 201.
Step two: the liquid and/or the gas with the second temperature is introduced into the outer tube 202, so that the balloon 201 is expanded to be in contact with the blood vessel stent 10.
Because the blood vessel stent 10 is compressed at the second temperature and is convenient to be fixed on the balloon 201, the balloon 201 is expanded by introducing the liquid and/or the gas with the second temperature until the balloon 201 is contacted with the blood vessel stent 10, and the blood vessel stent 10 is deformed and starts to shrink after contacting the balloon 201 with the second temperature.
Step three: releasing part of the liquid and/or the gas in the outer tube 202 to shrink the balloon 201, so that the vascular stent 10 is compressed to a compressed state capable of being attached to the outer surface of the balloon 201.
At the same time when the vascular stent 10 starts to shrink, part of the liquid and/or the gas in the outer tube 202 is released. Upon release, the balloon 201 begins to contract to ensure that the balloon 201 also contracts simultaneously with the contraction of the vessel, without damaging the vessel stent 10. When the vessel stent 10 is in a compressed state and does not continue to shrink, the release of the liquid or the gas is stopped, so that the vessel stent 10 can be fixedly attached to the balloon 201 and does not slide with each other.
Step four: and moving the balloon 201 to enable the blood vessel stent 10 to move synchronously with the balloon 201.
After the blood vessel stent 10 is attached to the outer surface of the balloon 201 in a compressed state, the blood vessel stent 10 can move synchronously with the balloon 201, so that the blood vessel stent 10 can be recovered, or the position of the blood vessel stent 10 can be adjusted.
In summary, in the vessel stent, the vessel stent system, the method for delivering the vessel stent, and the method for retrieving or adjusting the position of the vessel stent provided in the present embodiment, the vessel stent 10 is switched between the compressed state and the expanded state in the first temperature range. The vascular stent 10 maintains a compressed shape memory state during the second temperature range. Therefore, in the present embodiment, by using the state characteristics of the vascular stent 10 at the first temperature and the second temperature, 100% recovery or position adjustment of the vascular stent 10 can be achieved, so that complications caused by irrecoverability or non-adjustability of the implanted vascular stent 10 can be alleviated.
It should be understood, however, that the intention is not to limit the invention to the particular embodiments described. It will be apparent to those skilled in the art from this disclosure that many changes and modifications can be made, or equivalents modified, in the embodiments of the invention without departing from the scope of the invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the protection scope of the technical solution of the present invention, unless the content of the technical solution of the present invention is departed from.
Claims (19)
1. A vascular stent, characterized in that the stent is a tubular structure and is switched between a compressed state and an expanded state in a first temperature range; in a second temperature range, the vascular stent maintains a compressed shape memory state, and a maximum temperature of the first temperature range is less than a minimum temperature of the second temperature range.
2. The vascular stent of claim 1, wherein the first temperature range is less than 40 degrees celsius.
3. The vascular stent of claim 1, wherein the second temperature range is greater than or equal to 40 degrees celsius.
4. The stent of claim 1, wherein the material of the stent comprises nitinol.
5. The stent according to claim 1, wherein the stent has a net structure, and is cut from a tube material or woven from a metal wire.
6. The vascular stent of claim 1, wherein a plurality of first visualization markers are disposed on the vascular stent, the first visualization markers being visible under X-rays.
7. The vascular stent of claim 6, wherein the first visualization marker is a wire or a metal tube that is fixed at a predetermined position on the vascular stent.
8. The stent according to claim 6, wherein the material of the first visualization marker comprises at least one of platinum, gold and silver.
9. A vascular stent system, comprising: a balloon transporter and a vascular stent as in any one of claims 1-8; wherein,
the balloon conveyor comprises a balloon and an outer tube connected with the balloon; and
the blood vessel support is sleeved on the outer surface of the saccule.
10. The vascular stent system of claim 9, wherein the balloon has opposite ends, both of which are connected to the outer tube such that the balloon is in communication with the outer tube.
11. The vascular stent system of claim 9, wherein the balloon conveyor further comprises an inner tube disposed through the outer tube and the balloon.
12. The vascular stent system of claim 11, wherein the balloon transporter further comprises a plurality of second visualization markers; the second developing mark is fixedly arranged on the inner tube and is positioned in the saccule.
13. The stent system of claim 12, wherein the second visualization marker is a wire or a tube and the material comprises: at least one of platinum, gold and silver.
14. The vascular stent system of claim 9, wherein the balloon has two states, a deflated state and an inflated state.
15. A method for delivering a stent-graft, which is carried out using the stent-graft system according to any one of claims 9 to 14, the method comprising:
in a first temperature range, the vascular stent is in a compressed state and is sleeved on the outer surface of the balloon;
synchronously moving the vascular stent and the balloon to a target position;
introducing liquid and/or gas in the first temperature range into the outer tube to expand the balloon and drive the vascular stent to expand to a preset expansion state;
releasing a portion of the liquid and/or the gas in the outer tube to deflate the balloon and disengage from the vascular stent.
16. The method of claim 15, wherein the balloon transporter is withdrawn after the stent is detached from the balloon.
17. The method of claim 15, wherein the liquid is a contrast agent or saline.
18. A method for retrieving or adjusting the position of a stent, which is carried out using the stent system according to any one of claims 9 to 14, the method comprising:
conveying the saccule to the position of the vascular stent and penetrating the saccule into the vascular stent;
passing a liquid and/or gas at a second temperature range into the outer tube to inflate the balloon into contact with the vascular stent;
releasing a portion of the liquid and/or the gas in the outer tube to deflate the balloon, thereby compressing the stent to a compressed state capable of adhering to an outer surface of the balloon;
and moving the balloon to enable the vascular stent to move synchronously with the balloon.
19. The method for recovering or adjusting the position of a vascular stent of claim 18, wherein the liquid is a contrast medium or saline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011528051.3A CN114652496A (en) | 2020-12-22 | 2020-12-22 | Blood vessel stent, blood vessel stent system, method for transporting blood vessel stent, and method for recovering or adjusting position of blood vessel stent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011528051.3A CN114652496A (en) | 2020-12-22 | 2020-12-22 | Blood vessel stent, blood vessel stent system, method for transporting blood vessel stent, and method for recovering or adjusting position of blood vessel stent |
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| Publication Number | Publication Date |
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| CN114652496A true CN114652496A (en) | 2022-06-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011528051.3A Pending CN114652496A (en) | 2020-12-22 | 2020-12-22 | Blood vessel stent, blood vessel stent system, method for transporting blood vessel stent, and method for recovering or adjusting position of blood vessel stent |
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| Country | Link |
|---|---|
| CN (1) | CN114652496A (en) |
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2020
- 2020-12-22 CN CN202011528051.3A patent/CN114652496A/en active Pending
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