CN112690872A - Thrombectomy support - Google Patents
Thrombectomy support Download PDFInfo
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- CN112690872A CN112690872A CN202011599239.7A CN202011599239A CN112690872A CN 112690872 A CN112690872 A CN 112690872A CN 202011599239 A CN202011599239 A CN 202011599239A CN 112690872 A CN112690872 A CN 112690872A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/22—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/22—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for
- A61B2017/22038—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for with a guide wire
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/22—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for
- A61B2017/22038—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for with a guide wire
- A61B2017/22045—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for with a guide wire fixed to the catheter; guiding tip
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/22—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for
- A61B2017/22094—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for for crossing total occlusions, i.e. piercing
Abstract
The invention discloses a thrombus removal support, and belongs to the technical field of medical instruments. The invention provides a thrombus taking support which comprises a guide wire, a mesh support main body and a protective umbrella, wherein the mesh support main body and the protective umbrella are sleeved on the guide wire; the setting of first wire makes the effectively cutting thrombus of mesh stent main part in the in-process of self-expanding for it is more smooth to get the thrombus process.
Description
Technical Field
The invention relates to a thrombus taking support, and belongs to the technical field of medical instruments.
Background
Acute stroke is the third leading cause of death today and is the leading cause of disability in adults, with ischemic stroke accounting for about 85% of acute stroke. Ischemic stroke is mainly caused by embolization of larger vessels (diameter >2mm), and the lethality of embolization of larger vessels is 53% -92%. It can be seen that ischemic stroke is a disease with high morbidity, disability rate and mortality.
At present, the methods which are proved to be effective in treating ischemic stroke by medicine mainly comprise medicinal thrombolysis and mechanical thrombus removal. The method mainly comprises the steps of placing the medicine at a pathological position by using a catheter and then releasing the medicine to form a high medicine concentration locally, wherein the rt-PA activates plasminogen to become plasmin-dissolving blood clots through plasminogen arginine-valine so as to achieve the purpose of thrombolysis. However, the actual thrombolysis rate of this method is low. The drug thrombolysis treatment rate of developed countries is only 4.1-6.3%, and the thrombolysis treatment rate of China is lower. Therefore, drug thrombolysis has not been able to fully meet clinical needs.
The mechanical thrombus removal is mainly realized by the steps of puncturing the femoral artery, enabling a thrombus removal device to reach a position of blood vessel occlusion through the blood vessel, then enabling the thrombus to pass through the occluded blood vessel, and removing the thrombus through the thrombus removal device or a thrombus removal catheter, so that the blood flow of the blood vessel is recovered, and the purpose of thrombus removal is achieved. Compared with the medicine thrombolysis, the mechanical thrombolysis obviously improves the blood vessel recanalization rate.
Mechanical thrombectomy stents can be divided into proximal thrombectomy stents (placed at the proximal end of the thrombus) and distal thrombectomy stents (placed at the distal end of the thrombus) depending on the placement location. The proximal thrombus-taking bracket mainly comprises a thrombus-taking suction catheter, and the distal thrombus-taking bracket mainly comprises a capturing thrombus-taking bracket and a rotary-cut thrombus-taking bracket. The catching and thrombus-taking support mainly comprises a guide wire and a self-expanding support sleeved on the guide wire, and in the thrombus-taking process, the self-expanding support can be embedded into thrombus during self-expansion so as to cut the thrombus, and thrombus fragments enter the inner cavity gap of the self-expanding support through meshes of the self-expanding support.
However, in order to prevent the thrombus from escaping, the existing thrombus capturing and extracting stent often means that the self-expanding stent is arranged densely, which greatly hinders the effective cutting of the thrombus, and thrombus fragments cut by the excessively dense self-expanding stent are often small and easily escape from meshes of the self-expanding stent.
Therefore, it is highly desirable to design a stent for capturing and removing thrombus, which can effectively prevent the thrombus from escaping, so as to overcome the defects of the existing stent for capturing and removing thrombus.
Disclosure of Invention
[ problem ] to
The invention aims to provide a capturing and thrombus-taking bracket which can effectively prevent thrombus from escaping.
[ solution ]
In order to solve the technical problem, the invention provides a thrombus removal support which comprises a guide wire, a mesh support main body and a protective umbrella, wherein the mesh support main body and the protective umbrella are sleeved on the guide wire; the net-shaped support main body is formed by spirally extending a plurality of first metal wires along the circumferential direction of the guide wire, the near end of the net-shaped support main body is a half-spindle-shaped closing-in, the far end of the net-shaped support main body is an opening, and the far ends of the first metal wires in the plurality of first metal wires are connected to form a first wing; the protective umbrella is in a conical shape, and the opening of the protective umbrella is opposite to the opening of the net-shaped support main body. The near-end is the one end that the thrombectomy support is close to the operator, the distal end is the one end that the thrombectomy support kept away from the operator.
In an embodiment of the present invention, the first wing may have a circular arc shape or a pointed shape.
In one embodiment of the present invention, the mesh stent body comprises a first group of metal wires, a second group of metal wires, a third group of metal wires and a fourth group of metal wires, each group of metal wires comprises at least two first metal wires, and the two first metal wires in the same group have opposite spiral directions.
In one embodiment of the present invention, the two first wires of the first group intersect twice and then the distal ends are connected to form a first wing, the two first wires of the third group opposite to the first group also intersect twice and then the distal ends are connected to form a first wing, and the two first wires of the second group and the fourth group adjacent to the first group respectively intersect four times and then the distal ends are connected to form a first wing.
In one embodiment of the present invention, a portion between the first intersection and the second intersection, a portion between the second intersection and the third intersection, a portion between the third intersection and the fourth intersection, and a portion after the fourth intersection of the two first wires of the second group are referred to as a first segment, a second segment, a third segment, and a fourth segment, respectively; a part between the first intersection and the second intersection, a part between the second intersection and the third intersection, a part between the third intersection and the fourth intersection, a part after the fourth intersection and a part after the third intersection are respectively called a fifth section, a sixth section, a seventh section and an eighth section; two second metal wires extend out of the third section in a spiral mode along the circumferential direction of the guide wire, and the spiral directions of the two second metal wires are opposite; two third metal wires extend out of the seventh section in a spiral mode along the circumferential direction of the guide wire, and the spiral directions of the two third metal wires are opposite; the two second metal wires on the third section are crossed once in the spiral process, the two third metal wires on the seventh section are also crossed once in the spiral process, and after the two second metal wires on the third section are crossed once, the two second metal wires on the third section are respectively connected with the far ends of the two third metal wires on the seventh section to form a second wing.
In an embodiment of the present invention, the second wing may have a circular arc shape or a pointed shape.
In an embodiment of the present invention, two second wires also extend from the fourth segment, and the two second wires also extend spirally along the circumferential direction of the guide wire and have opposite spiral directions; two third metal wires also extend out of the eighth section, and the two third metal wires also extend spirally along the circumferential direction of the guide wire and have opposite spiral directions; the two second metal wires on the fourth section are crossed once in the spiral process, the two third metal wires on the eighth section are also crossed once in the spiral process, and after the two second metal wires on the fourth section are crossed once, the two second metal wires on the fourth section are respectively connected with the far ends of the two third metal wires on the eighth section to form a third wing.
In an embodiment of the present invention, the third wing may have a circular arc shape or a spike shape.
In one embodiment of the invention, the first wires of the third group are arranged symmetrically to the first wires of the first group.
In one embodiment of the invention, the first wires of the fourth group are arranged symmetrically to the first wires of the second group.
In one embodiment of the invention, the second wire and the third wire are symmetrically arranged.
In one embodiment of the invention, an encryption mesh is provided on the first wing, the second wing and/or the third wing.
In one embodiment of the invention, the netting is woven from rubber cords.
In one embodiment of the present invention, the protective umbrella comprises umbrella ribs and an umbrella cover; the proximal ends of the ribs are connected to the distal end of the main body of the mesh support so that the umbrella can be unfolded while the distal end of the main body of the mesh support is expanded.
In one embodiment of the present invention, the rib is formed by a plurality of fourth wires extending spirally in a circumferential direction of the guide wire.
In one embodiment of the present invention, the rib is formed by four fourth wires spirally extending in the circumferential direction of the guide wire, and two adjacent fourth wires out of the four fourth wires are grouped into two groups, namely a fifth group and a sixth group, and the directions of the spiral directions of the two fourth wires in the same group are opposite.
In one embodiment of the present invention, the two fourth wires of the fifth and sixth groups are joined at their proximal ends after crossing twice to form a joint.
In one embodiment of the invention, the fourth wire of the fifth group is arranged symmetrically to the fourth wire of the sixth group.
In one embodiment of the present invention, the connection point formed by connecting the two fourth wires of the fifth group is connected to the first wing formed by connecting the two first wires of the second group, and the connection point formed by connecting the two fourth wires of the sixth group is connected to the first wing formed by connecting the two first wires of the fourth group, so that the protective umbrella can be unfolded while the distal end of the mesh-shaped stent body is expanded.
In an embodiment of the present invention, the umbrella cover is provided with a plurality of first through holes.
In one embodiment of the present invention, the first through holes are honeycomb-shaped.
In one embodiment of the invention, the first through holes are uniformly arranged on the umbrella cover along the circumferential direction around the central line of the guide wire.
In one embodiment of the present invention, the protective umbrella further comprises an umbrella support sleeved on the guide wire; the umbrella support is in a horn shape with a large near end and a small far end, two ends of the umbrella support are open, and the near end opening of the umbrella support is opposite to the far end opening of the reticular support main body.
In one embodiment of the invention, the proximal end of the umbrella stay is fixed to the canopy.
In one embodiment of the invention, the umbrella support is provided with a plurality of second through holes; the second through hole is spindle-shaped, two ends of the second through hole point to two ends of the umbrella support respectively, and the far end of the second through hole extends to the opening of the far end of the umbrella support, so that the opening of the far end of the umbrella support can be opened or closed under the influence of blood flow or thrombus.
In one embodiment of the present invention, the number of the second through holes is twelve.
In one embodiment of the invention, the proximal end of the mesh stent body is connected with a proximal developing ring sleeved on the guide wire and is welded on the guide wire through the proximal developing ring; the far end of the umbrella support is connected with a far end developing ring sleeved on the guide wire, and the umbrella support and the far end developing ring are not welded on the guide wire.
In one embodiment of the invention, a portion of the wire segment of the guidewire is replaced with a blood flow channel; the blood flow channel is positioned in the mesh support main body and/or the protective umbrella, and is tubular, and a plurality of third through holes are formed in the tube body of the blood flow channel.
In one embodiment of the invention, a plurality of pairs of cut third through holes are uniformly distributed on the tube body of the blood flow channel along the axial direction; the two third through holes in the same pair are symmetrically arranged around the center line of the guide wire, and the adjacent two pairs of third through holes are arranged in a staggered manner.
In one embodiment of the invention, the distal end of the guidewire is provided with a coil.
In one embodiment of the present invention, the mesh stent body is laser cut from a stainless steel tube in a spindle shape.
In one embodiment of the present invention, the length of the mesh stent body is 3cm, and the radial width is 5 to 7 mm.
In one embodiment of the present invention, the umbrella rib is formed by laser cutting a stainless steel tube in a spindle shape.
In one embodiment of the present invention, the mesh stent body and the umbrella ribs are integrally laser-cut from one spindle-shaped stainless steel tube.
In one embodiment of the present invention, both ends of the cross section of the spindle-shaped stainless steel pipe are 120 ° to 135 °.
In one embodiment of the present invention, the umbrella cover is made of a polymer film.
In one embodiment of the present invention, the material of the umbrella stand is a polymer film.
In one embodiment of the present invention, the polymer film is polyurethane to which a developer is added.
In one embodiment of the invention, the canopy and the canopy stay are integral.
In one embodiment of the invention, said canopy is attached to the ribs by glue.
In one embodiment of the invention, the blood flow channel is laser cut from a stainless steel tube.
In one embodiment of the invention, the material of the spring ring is PtNi alloy.
[ advantageous effects ]
1. The invention provides a thrombus taking support which comprises a guide wire, a mesh support main body and a protective umbrella, wherein the mesh support main body and the protective umbrella are sleeved on the guide wire; the setting of first wire makes the effectively cutting thrombus of mesh stent main part in the in-process of self-expanding for it is more smooth to get the thrombus process.
Furthermore, the mesh-shaped support main body is formed by spirally extending eight first metal wires along the circumferential direction of the guide wire, wherein two adjacent first metal wires in the eight first metal wires are in one group, four groups are provided, namely a first group, a second group, a third group and a fourth group, the spiral directions of the two first metal wires in the same group are opposite, the two first metal wires in the first group are intersected twice, then the distal ends of the two first metal wires in the first group are connected to form a wing, the two first metal wires in the third group opposite to the first metal wires in the first group are also connected to form a wing after being intersected twice, and the distal ends of the two first metal wires in the second group and the fourth group adjacent to the third group are connected to form a wing after being intersected four times; in order to prevent thrombus from escaping, the conventional thrombus taking support is often arranged densely, so that effective cutting of thrombus is greatly hindered, thrombus fragments obtained by cutting the excessively dense self-expanding support are often very small and easily escape from meshes of the self-expanding support, and the density of a net-shaped support main body is moderate due to the arrangement of the first metal wire of the thrombus taking support, so that the thrombus can be effectively cut in the self-expanding process of the net-shaped support main body, and the excessively dense thrombus caused by cutting the existing net-shaped support main body can be avoided; when the stent passes through a tortuous blood vessel, the main body of the mesh stent is subjected to a great radial force and is further compressed due to the narrowness of the blood vessel, so that the thrombus taking of the main body of the mesh stent is greatly influenced.
Furthermore, four wings are additionally arranged on the first metal wires of the second group and the fourth group of the net-shaped bracket main body; the wings additionally arranged on the embolectomy stent ensure that the density of the net-shaped stent main body is moderate, so that the thrombus can be effectively cut in the self-expanding process of the net-shaped stent main body, and the cut thrombus caused by the excessive density of the net-shaped stent main body can be avoided; when the stent passes through a tortuous blood vessel, the main body of the mesh stent is subjected to a great radial force and is further compressed due to the narrowness of the blood vessel, so that the thrombus taking of the main body of the mesh stent is greatly influenced.
2. The invention provides a thrombus taking support, wherein a wing of the thrombus taking support is provided with a encryption net; the setting of the encryption net can effectively prevent the thrombus from escaping from the main body of the reticular stent.
Furthermore, the encryption net is woven by rubber ropes; the rubber texture net can not influence the expansion and contraction of the net-shaped stent main body and the cutting of thrombus.
3. The invention provides a bolt taking support which is provided with a protective umbrella; the arrangement of the protective umbrella can effectively prevent thrombus from escaping from the main body of the reticular bracket.
Furthermore, the unfolding and the closing of the protective umbrella are controlled by umbrella ribs connected with the main body of the net-shaped support, so that the protective umbrella can be unfolded and closed while the distal end of the main body of the net-shaped support expands and contracts; the protective umbrella is unfolded and closed, so that before thrombus is taken out, the protective umbrella can smoothly enter a blood vessel through the micro catheter in a closed form, and the protective umbrella can be immediately unfolded while thrombus is cut in the thrombus taking process, so that the thrombus escape prevention effect is achieved.
4. The invention provides a bolt taking support, wherein a protective umbrella of the bolt taking support is provided with an umbrella support; the trumpet-shaped umbrella support well provides a supporting function for the umbrella cover of the protective umbrella, and the umbrella cover of the protective umbrella is prevented from deforming or even being damaged under the action of blood flow or thrombus.
Furthermore, the umbrella support of the protective umbrella is of a self-locking structure; at the thrombectomy in-process, before the thrombus got into the umbrella, the umbrella propped can be opened under the effect of blood flow for the thrombus can get into the umbrella smoothly, and after the thrombus got into the umbrella, if blood flow backward flow or thrombus were back to that, the umbrella propped can automatic shutting, made the thrombus can not escape from the umbrella, had effectively guaranteed to get and has tied the success rate.
5. The invention provides a bolt taking support, wherein a protective umbrella of the bolt taking support uses a high polymer film as an umbrella cover and an umbrella support; the umbrella surface and the umbrella support of the polymer film obviously reduce the occupied ratio of the far-end metal of the embolectomy support, so that the far-end of the embolectomy support is softer without damaging blood vessels.
6. The invention provides a bolt taking support, which is characterized in that a first through hole is formed in an umbrella cover of a protective umbrella; the arrangement of the first through hole ensures that the blood flow in the blood vessel is kept smooth in the whole thrombus taking process, thereby ensuring the smooth thrombus taking.
Furthermore, first through-hole is cellular, and cellular first through-hole stability is extremely strong, has effectively avoided the umbrella face of protection umbrella to warp under the blood flow effect, even damages.
7. The invention provides a thrombus taking support which is provided with a blood flow channel; the blood flow channel ensures that the blood flow in the blood vessel is kept smooth in the whole thrombus taking process, thereby ensuring the smooth thrombus taking.
Drawings
FIG. 1: the invention discloses a perspective view of the overall structure of one embodiment of a thrombectomy stent.
FIG. 2: an overall structural elevation view of one embodiment of the thrombectomy stent of the present invention.
FIG. 3: a top view of the overall structure of one embodiment of the thrombectomy stent of the present invention.
FIG. 4: a perspective view of a portion of the structure of one embodiment of the embolectomy stent of the present invention.
FIG. 5: an embodiment of the thrombectomy stent of the present invention is in a partial structural elevation view.
FIG. 6: a partial structural plan view of one embodiment of the embolectomy stent of the present invention.
FIG. 7: the invention is a left side view of the overall structure of one embodiment of the mesh stent body of the embolic stent.
FIG. 8: the invention discloses a perspective view of the whole structure of one embodiment of a protective umbrella of a bolt taking bracket.
FIG. 9 is a left side elevational view of the overall construction of one embodiment of the umbrella stand of the present invention.
FIG. 10 is an elevation view of one embodiment of a guidewire for an embolectomy stent of the present invention.
In fig. 1-10, a guide wire 1, a mesh stent body 2, a protective umbrella 3, a first wire 4, a first wing 5, a first group 6, a second group 7, a third group 8, a fourth group 9, a first section 10, a second section 11, a third section 12, a fourth section 13, a second wire 14, a fifth section 15, a sixth section 16, a seventh section 17, an eighth section 18, a third wire 19, a mesh 20, a rib 21, an umbrella cover 22, a fourth wire 23, a fifth group 24, a sixth group 25, a connection point 26, a first through hole 27, an umbrella stand 28, a second through hole 29, a blood flow passage 30, a third through hole 31, a spring coil 32, a second wing 33, a third wing 34, a proximal development ring 35, and a distal development ring 36.
Detailed Description
The invention will be further elucidated with reference to the embodiments and the drawings.
Example 1: guide wire
Referring to fig. 1-10, the invention provides a thrombus removal stent, which comprises a guide wire 1, a mesh stent main body 2 and a protective umbrella 3, wherein the mesh stent main body is sleeved on the guide wire 1; the reticular stent main body 2 is formed by spirally extending a plurality of first metal wires 4 along the circumferential direction of the guide wire, the near ends of the first metal wires 4 are half-spindle-shaped closed ends, the far ends of the first metal wires 4 are openings, and the far ends of the first metal wires 4 are connected to form first wings 5; the protective umbrella 3 is conical, and the opening of the protective umbrella is opposite to the opening of the reticular stent main body 2. The near-end is the one end that the thrombectomy support is close to the operator, the distal end is the one end that the thrombectomy support kept away from the operator.
Preferably, the first wing 5 may have a circular arc shape or a pointed shape.
Preferably, the mesh stent body 2 comprises a first group of metal wires 6, a second group of metal wires 7, a third group of metal wires 8 and a fourth group of metal wires 9, each group of metal wires comprises at least two first metal wires 4, and the two first metal wires 4 in the same group have opposite spiral directions.
Preferably, the mesh stent body 2 comprises a first group of metal wires 6, a second group of metal wires 7, a third group of metal wires 8 and a fourth group of metal wires 9, each group of metal wires comprises two first metal wires 4, and the two first metal wires 4 in the same group have opposite spiral directions.
Preferably, the two first wires 4 of the first group 6 are intersected twice and then connected at the far end to form the first wing 5, the two first wires 4 of the opposite third group 8 are also connected at the far end after being intersected twice to form the first wing 5, and the two first wires 4 of the second group 7 and the fourth group 9 which are adjacent to the first wires are connected at the far end after being intersected four times respectively to form the first wing 5.
Preferably, a portion between the first intersection and the second intersection, a portion between the second intersection and the third intersection, a portion between the third intersection and the fourth intersection, and a portion after the fourth intersection of the two first wires 4 of the second group 7 are referred to as a first segment 10, a second segment 11, a third segment 12, and a fourth segment 13, respectively; the portions between the first and second intersections, the portions between the second and third intersections, the portions between the third and fourth intersections, and the portions after the fourth intersection of the two first wires 4 of the fourth group 9 are referred to as a fifth section 15, a sixth section 16, a seventh section 17, and an eighth section 18, respectively; two second metal wires 14 extend out of the third section 12, and the two second metal wires 14 extend spirally along the circumferential direction of the guide wire and have opposite spiral directions; two third metal wires 19 extend out of the seventh section 17, and the two third metal wires 19 extend spirally along the circumferential direction of the guide wire and have opposite spiral directions; the two second wires 14 of the third segment 12 are crossed once in the spiral process, the two third wires 19 of the seventh segment 17 are also crossed once in the spiral process, and after the two second wires 14 of the third segment 12 are respectively connected with the distal ends of the two third wires 19 of the seventh segment 17 to form a second wing 33.
Preferably, the second wing 33 may have a circular arc shape or a pointed shape.
Preferably, two second wires 14 also extend out of the fourth segment 13, and the two second wires 14 also extend spirally along the circumferential direction of the guide wire and have opposite spiral directions; two third wires 19 also extend out of the eighth segment 18, and the two third wires 19 also extend spirally along the circumferential direction of the guide wire and have opposite spiral directions; the two second wires 14 of the fourth segment 13 intersect once during the spiral process, the two third wires 19 of the eighth segment 18 intersect once during the spiral process, and after the intersection, the two second wires 14 of the fourth segment 13 are respectively connected with the distal ends of the two third wires 19 of the eighth segment 18 to form a third wing 34.
Preferably, the third wing 34 may have a circular arc shape or a pointed shape.
Preferably, the first wires 4 of the third group 8 are arranged symmetrically to the first wires 4 of the first group 6.
Preferably, the first wires 4 of the fourth group 9 are arranged symmetrically to the first wires 4 of the second group 7.
Preferably, the second wire 14 and the third wire 19 are symmetrically disposed.
Preferably, the first wing 5, the second wing 33 and/or the third wing 34 are provided with an encryption net 20.
Preferably, the net 20 is woven from rubber rope.
Preferably, the protective umbrella 3 comprises umbrella ribs 21 and an umbrella cover 22; the proximal ends of the ribs 21 are connected to the distal end of the stent main body 2 so that the umbrella 3 can be deployed while the distal end of the stent main body 2 is expanded.
Preferably, the umbrella rib 21 is formed by spirally extending a plurality of fourth wires 23 along the circumferential direction of the guide wire.
Preferably, the rib 21 is formed by four fourth wires 23 extending spirally in the circumferential direction of the guide wire, and two adjacent fourth wires 23 of the four fourth wires 23 are grouped into two groups, namely a fifth group 24 and a sixth group 25, and the directions of the spiral directions of the two fourth wires 23 positioned in the same group are opposite.
Preferably, the two fourth wires 23 of the fifth and sixth sets 24, 25 meet each other proximally after crossing twice to form a junction 26.
Preferably, the fourth wire 23 of the fifth group 24 is arranged symmetrically to the fourth wire 23 of the sixth group 25.
Preferably, the connection point 26 formed by the connection of the two fourth wires 23 of the fifth group 24 is connected to the first wing 5 formed by the connection of the two first wires 4 of the second group 7, and the connection point 26 formed by the connection of the two fourth wires 23 of the sixth group 25 is connected to the first wing 5 formed by the connection of the two first wires 4 of the fourth group 9, so that the protective umbrella 3 can be unfolded while the distal end of the mesh-type stent body 2 is expanded.
Preferably, the umbrella cover 22 is provided with a plurality of first through holes 27.
Preferably, the first through holes 27 have a honeycomb shape.
Preferably, the first through holes 27 are uniformly arranged on the umbrella cover 22 along the circumferential direction around the central line of the guide wire 1.
Preferably, the protective umbrella 3 further comprises an umbrella support 28 sleeved on the guide wire 1; the umbrella support 28 is in a horn shape with a large near end and a small far end, two ends of the umbrella support 28 are open, and the near end opening of the umbrella support 28 is opposite to the far end opening of the reticular stent main body 2.
Preferably, the proximal end of said umbrella strut 28 is fixed to canopy 22.
Preferably, a plurality of second through holes 29 are formed in the umbrella support 28; the second through hole 29 is shaped like a spindle, two ends of which point to two ends of the umbrella stand 28, respectively, and a distal end of which extends to a distal opening of the umbrella stand 28, so that the distal opening of the umbrella stand 28 can be opened or closed under the influence of blood flow or thrombus.
Preferably, the number of the second through holes 29 is twelve.
Preferably, the proximal end of the mesh stent body 2 is connected with a proximal developing ring 35 sleeved on the guide wire 1, and is welded on the guide wire 1 through the proximal developing ring 35; the far end of the umbrella support 28 is connected with a far-end developing ring 36 sleeved on the guide wire 1, and the umbrella support 28 and the far-end developing ring 36 are not welded on the guide wire 1.
Preferably, part of the silk segment of the guide wire 1 is replaced by a blood flow channel 30; the blood flow channel 30 is located inside the mesh stent main body 2 and/or the protective umbrella 3, and the blood flow channel 30 is tubular, and a plurality of third through holes 31 are arranged on the tube body of the blood flow channel.
Preferably, a plurality of pairs of cut third through holes 31 are uniformly distributed on the tube body of the blood flow channel 30 along the axial direction; the two third through holes 31 of the same pair are symmetrically arranged about the central line of the guide wire 1, and the adjacent two pairs of third through holes 31 are arranged in a staggered manner.
Preferably, the distal end of the guide wire 1 is provided with a coil spring 32.
Preferably, the mesh stent body 2 is formed by laser cutting a stainless steel tube in a spindle shape.
Preferably, the length of the mesh-shaped stent body 2 is 3cm, and the radial width is 5-7 mm.
Preferably, the rib 21 is formed by laser cutting a stainless steel tube in a spindle shape.
Preferably, the mesh stent body 2 and the ribs 21 are integrally laser-cut from a single stainless steel tube in a spindle shape.
Preferably, both ends of the cross section of the spindle-shaped stainless steel pipe are 120 ° to 135 °.
Preferably, the material of the umbrella cover 22 is a polymer film.
Preferably, the material of the umbrella support 28 is a polymer film.
Preferably, the polymer film is polyurethane to which a developer is added.
Preferably, canopy 22 and struts 28 are integral.
Preferably, said canopy 22 is attached to the ribs 21 by means of glue.
Preferably, the blood flow channel 30 is laser cut from a stainless steel tube.
Preferably, the spring ring 32 is made of PtNi alloy.
Example 2: embolectomy method
The thrombectomy stent of example 1 was used, with the following specific steps:
when taking thrombus, an operator uses a micro catheter to convey the mesh stent main body 2 of the thrombus taking stent to the position of the thrombus; the microcatheter is retracted, in the process, the mesh stent main body 2 realizes self-expansion, the expanded mesh stent main body 2 can be embedded into thrombus, so as to cut thrombus, thrombus fragments enter the cavity gap of the reticular stent main body 2 through the meshes of the reticular stent main body 2, because the density of the thrombus taking support 3 is moderate, thrombus fragments can not be excessively crushed, and the thrombus fragments can not float to a far-end blood vessel along with blood flow due to the arrangement of the protective umbrella and the encryption net, thereby playing the role of preventing thrombus from escaping, simultaneously, the umbrella support of the protective umbrella is of a self-locking structure, after the thrombus enters the protective umbrella, if the blood flows back or the thrombus moves back, the umbrella support can be automatically locked, thereby playing the role of preventing the thrombus from escaping, in addition, the blood flow channel and the second through hole are arranged, so that the blood flow in the whole thrombus removal process is not blocked, and the smooth operation of the whole thrombus removal process is ensured. The operator moves the thrombus taking support out of the body and completes thrombus taking.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. The thrombus taking support is characterized by comprising a guide wire, a reticular support main body and a protective umbrella, wherein the reticular support main body is sleeved on the guide wire; the net-shaped support main body is formed by spirally extending a plurality of first metal wires along the circumferential direction of the guide wire, the near end of the net-shaped support main body is a half-spindle-shaped closing-in, the far end of the net-shaped support main body is an opening, and the far ends of the first metal wires in the plurality of first metal wires are connected to form a first wing; the protective umbrella is in a conical shape, and the opening of the protective umbrella is opposite to the opening of the net-shaped support main body.
2. The embolectomy support of claim 1, wherein the first wing may be rounded or spiked.
3. The embolectomy stent of claim 1 or 2 wherein the mesh stent body comprises a first set of wires, a second set of wires, a third set of wires, and a fourth set of wires, each set of wires comprising at least two first wires, the two first wires in the same set having opposite helical directions.
4. The embolectomy stent of claim 3 wherein a first group of two first wires meet twice before the distal ends meet to form a first wing, an opposing third group of two first wires also meet twice after the distal ends meet to form a first wing, and adjacent second and fourth groups of two first wires meet four times after the distal ends meet to form a first wing.
5. The embolectomy stent of claim 3 or 4, wherein the portion of the second set of two first wires between the first and second intersections, the second and third intersections, the third and fourth intersections, and the portion after the fourth intersection are referred to as the first segment, the second segment, the third segment, and the fourth segment, respectively; a part between the first intersection and the second intersection, a part between the second intersection and the third intersection, a part between the third intersection and the fourth intersection, a part after the fourth intersection and a part after the third intersection are respectively called a fifth section, a sixth section, a seventh section and an eighth section; two second metal wires extend out of the third section in a spiral mode along the circumferential direction of the guide wire, and the spiral directions of the two second metal wires are opposite; two third metal wires extend out of the seventh section in a spiral mode along the circumferential direction of the guide wire, and the spiral directions of the two third metal wires are opposite; the two second metal wires on the third section are crossed once in the spiral process, the two third metal wires on the seventh section are also crossed once in the spiral process, and after the two second metal wires on the third section are crossed once, the two second metal wires on the third section are respectively connected with the far ends of the two third metal wires on the seventh section to form a second wing.
6. The embolectomy stent of claim 5 wherein two second wires also extend from the fourth segment, and the two second wires also extend helically in the circumferential direction of the guidewire and are oppositely helical; two third metal wires also extend out of the eighth section, and the two third metal wires also extend spirally along the circumferential direction of the guide wire and have opposite spiral directions; the two second metal wires on the fourth section are crossed once in the spiral process, the two third metal wires on the eighth section are also crossed once in the spiral process, and after the two second metal wires on the fourth section are crossed once, the two second metal wires on the fourth section are respectively connected with the far ends of the two third metal wires on the eighth section to form a third wing.
7. The embolectomy stent of any of claims 1-6 wherein the first wing, second wing and/or third wing are provided with a netting.
8. A embolectomy support according to any of claims 1-7, wherein the umbrella comprises ribs and a canopy; the proximal ends of the ribs are connected to the distal end of the main body of the mesh support so that the umbrella can be unfolded while the distal end of the main body of the mesh support is expanded.
9. The embolectomy support of claim 8, wherein the umbrella cover is provided with a plurality of first through holes.
10. The thrombectomy stent of any one of claims 1-9, wherein a portion of the wire segment of the guidewire is replaced with a blood flow channel; the blood flow channel is positioned in the main body of the reticular stent and/or the protective umbrella, and is tubular, and a plurality of second through holes are arranged on the tube body of the blood flow channel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011599239.7A CN112690872B (en) | 2020-12-29 | 2020-12-29 | Thrombectomy support |
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| CN202011599239.7A CN112690872B (en) | 2020-12-29 | 2020-12-29 | Thrombectomy support |
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| CN112690872B CN112690872B (en) | 2022-05-31 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114305590A (en) * | 2022-03-16 | 2022-04-12 | 北京华脉泰科医疗器械股份有限公司 | Far-end protector |
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| CN112690872B (en) | 2022-05-31 |
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