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CN117137575B - Flaring suction catheter with bolt cutting function - Google Patents

Flaring suction catheter with bolt cutting function Download PDF

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Publication number
CN117137575B
CN117137575B CN202311145239.3A CN202311145239A CN117137575B CN 117137575 B CN117137575 B CN 117137575B CN 202311145239 A CN202311145239 A CN 202311145239A CN 117137575 B CN117137575 B CN 117137575B
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CN
China
Prior art keywords
thrombus
suction catheter
working head
flaring
balloon
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202311145239.3A
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Chinese (zh)
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CN117137575A (en
Inventor
李欣达
王震
朱宽
李志刚
王国辉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Xinwei Medical Technology Co ltd
Original Assignee
Shanghai Xinwei Medical Technology Co ltd
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Priority to CN202311145239.3A priority Critical patent/CN117137575B/en
Priority to PCT/CN2023/129634 priority patent/WO2024146238A1/en
Publication of CN117137575A publication Critical patent/CN117137575A/en
Application granted granted Critical
Publication of CN117137575B publication Critical patent/CN117137575B/en
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/22—Implements for squeezing-off ulcers or the like on inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; for invasive removal or destruction of calculus using mechanical vibrations; for removing obstructions in blood vessels, not otherwise provided for
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/32—Surgical cutting instruments
    • A61B17/3205—Excision instruments
    • A61B17/3207—Atherectomy devices working by cutting or abrading; Similar devices specially adapted for non-vascular obstructions
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/32—Surgical cutting instruments
    • A61B17/3205—Excision instruments
    • A61B17/3207—Atherectomy devices working by cutting or abrading; Similar devices specially adapted for non-vascular obstructions
    • A61B17/320725—Atherectomy devices working by cutting or abrading; Similar devices specially adapted for non-vascular obstructions with radially expandable cutting or abrading elements
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/32—Surgical cutting instruments
    • A61B17/3205—Excision instruments
    • A61B17/3207—Atherectomy devices working by cutting or abrading; Similar devices specially adapted for non-vascular obstructions
    • A61B17/320758—Atherectomy devices working by cutting or abrading; Similar devices specially adapted for non-vascular obstructions with a rotating cutting instrument, e.g. motor driven
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/84—Drainage tubes; Aspiration tips
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/84—Drainage tubes; Aspiration tips
    • A61M1/87—Details of the aspiration tip, not otherwise provided for
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00—Catheters; Hollow probes
    • A61M25/10—Balloon catheters
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00—Catheters; Hollow probes
    • A61M25/10—Balloon catheters
    • A61M25/1025—Connections between catheter tubes and inflation tubes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M29/00—Dilators with or without means for introducing media, e.g. remedies
    • A61M29/02—Dilators made of swellable material
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/22—Implements for squeezing-off ulcers or the like on inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; for invasive removal or destruction of calculus using mechanical vibrations; for removing obstructions in blood vessels, not otherwise provided for
    • A61B2017/22079—Implements for squeezing-off ulcers or the like on inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; for invasive removal or destruction of calculus using mechanical vibrations; for removing obstructions in blood vessels, not otherwise provided for with suction of debris
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/32—Surgical cutting instruments
    • A61B17/3205—Excision instruments
    • A61B17/3207—Atherectomy devices working by cutting or abrading; Similar devices specially adapted for non-vascular obstructions
    • A61B2017/320741—Atherectomy devices working by cutting or abrading; Similar devices specially adapted for non-vascular obstructions for stripping the intima or the internal plaque from a blood vessel, e.g. for endarterectomy
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/32—Surgical cutting instruments
    • A61B17/3205—Excision instruments
    • A61B17/3207—Atherectomy devices working by cutting or abrading; Similar devices specially adapted for non-vascular obstructions
    • A61B17/320758—Atherectomy devices working by cutting or abrading; Similar devices specially adapted for non-vascular obstructions with a rotating cutting instrument, e.g. motor driven
    • A61B2017/320775—Morcellators, impeller or propeller like means
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B2217/00—General characteristics of surgical instruments
    • A61B2217/002—Auxiliary appliance
    • A61B2217/005—Auxiliary appliance with suction drainage system

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Biomedical Technology (AREA)
  • Vascular Medicine (AREA)
  • Anesthesiology (AREA)
  • Hematology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Pulmonology (AREA)
  • Biophysics (AREA)
  • Child & Adolescent Psychology (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Surgical Instruments (AREA)
  • Media Introduction/Drainage Providing Device (AREA)

Abstract

The invention belongs to the technical field of medical appliances, and particularly relates to a flaring suction catheter with a thrombus cutting function, which comprises a suction catheter with a distal end having a flaring function and a thrombus cutter matched with the suction catheter for use, wherein an expandable working head is arranged at a distal end pipe orifice of the suction catheter, the working head is of a balloon auxiliary expansion type petal-shaped structure, the thrombus cutter is provided with a spiral cutting groove, and thrombus can be cut into strip thrombus with smaller size along the spiral cutting groove; the working head comprises a plurality of far-end separated nozzle petals and a balloon part arranged between two adjacent nozzle petals; the perimeter of the distal end of the balloon portion is greater than the perimeter of the proximal end of the balloon portion, such that the distal end of the working head expands into a horn shape after inflation of the balloon portion; the invention can cut the thrombus into the strip thrombus with smaller size along the spiral cutting groove, and the thrombus fragments generated by the thrombus breaking in the traditional mode are less.

Description

Flaring suction catheter with bolt cutting function
Technical Field
The invention belongs to the technical field of medical appliances, and particularly relates to a flaring suction catheter with a bolt cutting function.
Background
The interventional operation of thrombus is generally divided into two modes of stent thrombus taking and suction catheter. However, the corresponding apparatus with the support for thrombus breaking and thrombus taking is complex in operation, and can be normally used only by matching the thrombus taking/breaking support and the plugging net, and old and swollen thrombus is not easy to pass through the support bearing the plugging net or thrombus breaking easily occurs in the passing process. Conventional aspiration catheter systems include an aspiration catheter having a flaring function at the distal end and a thrombolytic element, and the expansion function of the aspiration catheter is achieved mostly by expansion of a braided structure; the aspiration catheter has the function of breaking thrombus, and if the diameter of the orifice is smaller than that of a blood vessel, the thrombus is easy to aspirate and is not completely aspirated. Moreover, current thrombus-breaking devices tend to break up the thrombus, causing micro-thrombus to flow into the vessel, causing secondary vessel thrombosis.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the flaring suction catheter with the thrombus cutting function, which does not need the matched instruments such as a plugging net and the like, is not easy to generate thrombus fragments and can be matched with blood vessels with different diameters better.
In order to achieve the above object, the present invention provides the following technical solutions:
the expandable suction catheter with the bolt cutting function comprises a suction catheter with a distal end having a flaring function and a bolt cutter matched with the suction catheter for use, wherein an expandable working head is arranged at the distal end pipe orifice of the suction catheter, the working head is of a balloon auxiliary expansion type petal-shaped structure, and the bolt cutter is provided with a spiral cutting groove;
the working head comprises a plurality of far-end separated nozzle petals and a balloon part arranged between two adjacent nozzle petals; the circumference of the distal end of the balloon part is larger than that of the proximal end of the balloon part, so that the distal end of the working head expands into a horn shape after the balloon part is filled, the diameter of the orifice of the distal end of the suction catheter is expanded, and the balloon part can be temporarily fixed on the inner wall of a blood vessel as a supporting point;
When the thrombus-sucking device is used, the thrombus is pushed while facing the spiral direction of the spiral cutting groove, the thrombus can be cut into a strip-shaped thrombus with smaller diameter along the spiral cutting groove, and compared with the thrombus fragments generated by the conventional thrombus breaking method, the thrombus after rotation is sucked into the suction catheter.
Further, the orifice valve is 3-6 pieces with equal size; the pipe orifice petals are equidistantly arranged along the circumferential direction of the working head, and the minimum interval of the central angles between the root parts of two adjacent pipe orifice petals is 15-120 degrees.
Further, when the working head is not filled in the circumferential direction of the suction catheter, the sum of the circumferential lengths of the distal ends of the balloon parts is 30% -50% of the circumference of the distal ends of the working head.
Further, a reserved seam is formed at the proximal end of the balloon portion up to the root of the orifice flap.
Further, the suction catheter wall comprises a supporting layer, a filling layer and a covering layer which are sequentially arranged from inside to outside; the supporting layer comprises a supporting inner layer, a supporting reinforcing layer and a supporting outer layer which are sequentially arranged from inside to outside; the support reinforcing layer is internally provided with a metal wire braiding or spring winding structure which is cut off to the proximal end of the orifice valve, and the filling layer is of a hollow structure and is arranged corresponding to the saccule part.
Further, the filling fluid in the filling layer is air or contrast liquid.
Further, the bolt cutter comprises a bolt cutting shaft for being mounted on a guide wire and a spiral cutting blade fixed on the bolt cutting shaft, wherein the thread edge of the spiral cutting blade is used as a cutting edge, and the root of the spiral cutting blade is connected to the bolt cutting shaft in a sealing way to form a spiral cutting groove; the bolt cutter is made of flexible materials.
Further, the spiral cutting blade is shaped like an elliptical sphere/spindle, a mushroom head, a cone or a frustum.
Further, the bolt cutting shaft is fixedly provided with 1 spiral cutting blade, the pitch of the spiral cutting blade is 3-10 mm, and the number of turns is 3-6.
Further, when in use, the thrombus is pushed along the spiral direction of the thrombus cutter while facing the thrombus, the pushing speed of the thrombus cutter is 2 mm/s-5 mm/s, and the rotating speed is 0.1rad/s-2rad/s; in use, the helical cutting groove of the thrombolytic device is located outside the suction catheter, and the distance from the proximal end of the helical cutting groove to the distal orifice of the suction catheter cannot exceed 10mm.
The beneficial effects of the invention are as follows:
The invention does not need the matched devices such as a plugging net, etc., has more convenient use, low operation difficulty and easy operation;
the thrombus is cut by rotating the thrombus cutter while pushing, so that the thrombus cutting device is simple and quick, and the thrombus is cut into strip-shaped thrombus with smaller size along the spiral cutting groove, and the thrombus cutter is a cutting instrument and is not a thrombus breaking instrument, so that fewer thrombus fragments are generated compared with the thrombus breaking in the traditional mode;
the orifice of the suction catheter can be filled through the balloon part, so that the distal end of the working head can be expanded to different degrees, vessels with different diameters can be matched better, the suction surface is enlarged, and more thrombus can be collected.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. Wherein:
fig. 1 is a schematic view of the structure of a suction catheter according to an embodiment of the present invention when not expanded.
Fig. 2 is a schematic view of the structure of the suction catheter according to the embodiment of the present invention when it is expanded.
Fig. 3 is a schematic view of a distal end front view of a working head according to an embodiment of the present invention when the working head is not expanded.
Fig. 4 is a schematic view of a distal end front view of a working head according to an embodiment of the present invention when expanded.
Figure 5 is a schematic side cross-sectional view of an embodiment of the present invention with the working head unexpanded.
FIG. 6 is a side view partially schematic cross-sectional illustration of an embodiment of the invention with a working head expanded
Fig. 7 is a schematic structural view of a thrombolytic device according to an embodiment of the present invention.
Fig. 8 is a schematic view illustrating an operating state of the thrombolytic device according to an embodiment of the present invention.
Fig. 9 is a schematic structural view of a thrombolytic device according to another embodiment of the present invention.
Fig. 10 is a side view of the thrombolytic device of fig. 9 according to the present invention.
Fig. 11 is a schematic structural view of a thrombolytic device according to another embodiment of the present invention.
Fig. 12 is a side view of the thrombolytic device of fig. 11 according to the present invention.
In the figure, a 1-working head, a 11-orifice valve, a 12-balloon part, a 13-reserved seam, a 14-channel part, a 15-supporting layer, a 16-filling layer and a 17-covering layer; 2-a guide wire; 3-thrombolytic device.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the invention, fall within the scope of protection of the invention.
In the description of the present invention, the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. refer to the orientation or positional relationship based on that shown in the drawings, merely for convenience of description of the present invention and do not require that the present invention must be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. The terms "coupled" and "connected" as used herein are to be construed broadly and may be, for example, fixedly coupled or detachably coupled; either directly or indirectly through intermediate components, the specific meaning of the terms being understood by those of ordinary skill in the art as the case may be.
The invention will be described in detail below with reference to the drawings in connection with embodiments. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
As shown in fig. 1 to 10, a flaring suction catheter with a thrombus cutting function comprises a suction catheter with a flaring function at the far end and a thrombus cutter 3 matched with the suction catheter for use, wherein an expandable working head 1 is arranged at the far end orifice of the suction catheter, the working head 1 is of a balloon auxiliary expansion type petal-shaped structure, the thrombus cutter 3 is provided with a spiral cutting groove, and thrombus can be cut into strip-shaped thrombus with smaller size along the spiral cutting groove;
the thrombus cutter 3 has good flexibility, but is hard relative to thrombus, so that the shape of a spiral cutting groove can be kept during working, and meanwhile, the vascular wall is not scratched, and the suction catheter wall is not scratched; the bolt cutter 3 can be made of nickel titanium metal or hard polymer materials such as nylon, TPU and the like; the bolt cutter 3 comprises a bolt cutting shaft for being mounted on the guide wire 2 and a spiral cutting blade fixed on the bolt cutting shaft, wherein the thread edge of the spiral cutting blade is used as a cutting edge, the root of the spiral cutting blade is connected to the bolt cutting shaft in a sealing way to form a spiral cutting groove, and the distal end, the proximal end and the peripheral surface of the spiral cutting groove are all open; the bolt cutting shaft can be barrel-shaped, and is sleeved at the far end of the guide wire 2 and then fixed by using adhesive; the bolt cutting shaft can also be in a rod shape, and the bolt cutting shaft is directly welded at the distal end of the guide wire 2;
The working head 1 comprises a plurality of nozzle petals 11 with separated distal ends and a balloon part 12 arranged between two adjacent nozzle petals 11; the circumference of the distal end of the balloon portion 12 is greater than the circumference of the proximal end of the balloon portion 12, so that the distal end of the working head 1 expands into a horn shape after the balloon portion 12 is inflated; the balloon part 12 in fig. 1,3 and 5 is in a full state, and the balloon part 12 in fig. 2,4, 6 and 8 drives the working head 1 to open, so that the diameter of the distal pipe orifice of the suction catheter is expanded;
The balloon portion 12 has two arrangement modes, the first arrangement mode is shown in fig. 1 to 6, the cross-sectional area of the distal end of the balloon portion 12 is larger than the cross-sectional area of the proximal end of the balloon portion 12, the balloon portion 12 is approximately triangular or isosceles trapezoid when seen from the outer side surface of the balloon portion 12, and the shape of the interval reserved between two adjacent orifice flaps 11 is adapted to the shape of the balloon portion 12; in the unfilled state, the balloon portion 12 is in a flattened state; the elasticity of the outer side wall of the balloon part 12 is larger than that of the inner side wall of the balloon part 12; after filling, the inner side wall and the outer side wall of the balloon portion 12 extend circumferentially, so that the tail end of the orifice valve 11 expands, the outer side wall of the balloon portion 12 bulges outwards, and the bulged outer surface of the balloon portion 12 protrudes out of the circumcircle of the orifice valve 11, so that the balloon portion 12 can be temporarily fixed on the inner wall of a blood vessel as a supporting point;
The second arrangement mode of the balloon portion 12 is that the balloon portion 12 is still approximately triangular or isosceles trapezoid, and the space reserved between two adjacent nozzle petals 11 is bar-shaped, for example, may be rectangular; in the unfilled state, the distal end of the balloon portion 12 is accommodated in a pleated state in the space between the two orifice plates; the outer side wall of the balloon portion 12 has elasticity greater than that of the inner side wall of the balloon portion 12, or the balloon portion 12 has no elasticity, but the surface area of the outer side wall of the balloon portion 12 is greater than that of the inner side wall of the balloon portion 12; after filling, the balloon portion 12 bulges, the folded portion stretches out, the tail end of the orifice flap 11 expands, the outer side wall of the balloon portion 12 bulges outwards, and the bulged outer surface of the balloon portion 12 protrudes out of the circumcircle of the orifice flap 11, so that the balloon portion 12 can be temporarily fixed on the inner wall of the blood vessel as a supporting point.
As shown in fig. 1 to 6, the nozzle petals 11 are 3 to 6 equal in size; the pipe orifice petals 11 are equidistantly arranged along the circumferential direction of the working head 1, and the minimum interval of the central angles between the root parts of two adjacent pipe orifice petals 11 is 15-120 degrees; along the circumference of the suction catheter, when the working head 1 is not filled, the sum of the circumferential lengths of the distal ends of the balloon parts 12 is 30% -50% of the circumference of the distal end of the working head 1.
As shown in fig. 1 to 6, a reserved slit 13 is formed at the proximal end of the balloon portion 12 up to the root of the orifice flap 11, and the purpose of the reserved slit 13 is to ease the opening angle of the catheter flap, so as to ease the radial force applied to the catheter flap at the position where the reserved slit and the balloon portion 12 are bordered when the working head expands, and avoid the catheter flap from generating folds or breaks in filling; the reserved space between two adjacent orifice flaps 11 is the space where the reserved seam 13 and the balloon portion 12 are located.
As shown in fig. 5 to 6, the suction catheter wall comprises a supporting layer 15, a filling layer 16 and a covering layer 17 which are sequentially arranged from inside to outside; the supporting layer 15 comprises a supporting inner layer, a supporting reinforcing layer and a supporting outer layer which are sequentially arranged from inside to outside; the supporting inner layer and the supporting outer layer are both made of high polymer materials, and the supporting layer 15 at the pipe orifice 11-shaped structure is not provided with a metal wire reinforcing layer and is made of high polymer materials only; a metal wire braiding or spring winding structure which is cut off to the proximal end of the orifice valve 11 is arranged in the support reinforcing layer; the filling layer 16 is of a hollow structure, can be filled with fluid, is used for filling the balloon part 12 between the orifice petals 11 at the orifice, and enables the petal-shaped structure to be opened through filling of the balloon part 12; the filling layer 16 is not arranged in the layer structure of the orifice flap 11, the filling layer 16 comprises a channel part 14 and a working part corresponding to the balloon part 12, the channel part 14 is communicated with the working part, and the filled fluid in the balloon part 12 enters and exits the suction catheter through the channel part 14; the filling fluid in the filling layer 16 is air or contrast medium, and may be filled with other fluids safe to the human body in the prior art, such as physiological saline.
The bolt cutter 3 is a cutting tool loaded in front of the guide wire 2, and the shape of the bolt cutter 3 is an elliptic sphere/spindle shape or a mushroom head shape, a cone shape or a frustum shape; as shown in fig. 7 and 8, the middle of the elliptical sphere/spindle-type bolt cutter 3 is bigger and smaller at two ends; the mushroom head-shaped, cone-shaped or frustum-shaped bolt cutter 3 is large at one end and small at one end, fig. 9 and 10 are schematic structural views of the mushroom head-shaped bolt cutter 3, and fig. 11 and 12 are schematic structural views of the cone-shaped bolt cutter 3; however, the shape of the bolt cutter 3 is such that it has a larger diameter at least at one position, so that the diameter of the maximum diameter of the bolt cutter 3 is about 90% of the minimum diameter of the working head 1, ensuring that the bolt cutter 3 can move in the suction catheter, while the bolt cutter 3 has the largest possible size; the screw cutting device is characterized in that 1 screw cutting blade is fixed on the screw cutting shaft, the edge of the screw cutting blade is a cutting edge and is used for cutting thrombus, the screw pitch of the screw cutting blade is 3-10 mm, the number of turns is 3-6, the 1 screw cutting blade forms a continuous screw cutting groove, the screw cutting blade is rotated and pushed along the screw direction when in use while facing the thrombus, if the thrombus is not broken in the cutting process, the thrombus can be cut into a strip thrombus with smaller diameter along the screw cutting groove, if the thrombus is broken in the cutting process, the broken thrombus is a plurality of long-strip thrombus, and compared with the thrombus fragments generated by the conventional method, the broken thrombus is less.
When the invention is used, the invention also needs to be matched with a guide wire 2 driving device for rotating and pushing the guide wire 2 and a negative pressure suction pump; in use, the thrombus cutter 3 is sent to a thrombus deposition position through a suction catheter, a negative pressure suction pump connected with the suction catheter is turned on, and the orifice of the suction catheter is expanded to match the diameter of a blood vessel; advancing while rotating along the spiral direction of the thrombus cutter 3, wherein the advancing speed of the thrombus cutter 3 is 2 mm/s-5 mm/s, and the rotating speed is 0.1rad/s-2rad/s; in use, the spiral cutting groove of the thrombolysis device 3 is positioned outside the suction catheter, the distance from the proximal end of the spiral cutting groove to the distal end orifice of the suction catheter cannot exceed 10mm, thrombus can be cut into a whole by the spiral cutter head of the thrombolysis device 3 but the strip thrombus with smaller diameter is captured by the thrombus collecting structure, and then the thrombus is withdrawn from the human body along with the suction catheter;
the flaring catheter of the invention can also be matched with products such as a thrombus taking bracket and the like, but the operation difficulty can be improved; the thrombolytic device 3 can also be used with other large-caliber aspiration catheters, but may cause insufficient collection of thrombus debris.
The orifice of the suction catheter can be inflated by the balloon part 12 in different degrees, so that the distal end of the working head 1 can be expanded in different degrees, the suction catheter can be matched with blood vessels better, the suction surface is enlarged, and more thrombus can be collected; the invention is a cutting instrument, not a thrombus breaking instrument, and fewer thrombus fragments are generated compared with thrombus breaking; the invention has the advantages of few matched devices, more convenient use, low operation difficulty and easy operation.
It is to be understood that the above description is intended to be illustrative, and that the embodiments of the present application are not limited thereto. The foregoing description of the preferred embodiments of the application is not intended to limit the application to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the application as defined by the appended claims.

Claims (9)

1.A flaring suction catheter with a thrombolysis function, comprising a suction catheter with a flaring function at the far end and a thrombolysis device (3) matched with the suction catheter for use, which is characterized in that: the distal end pipe orifice of the suction catheter is provided with an expandable working head (1), the working head (1) is of a balloon auxiliary expansion type petal-shaped structure, and the thrombus cutter (3) is provided with a spiral cutting groove which can cut thrombus into strip thrombus with smaller size; the bolt cutter (3) comprises a bolt cutting shaft for being mounted on a guide wire (2) and a spiral cutting blade fixed on the bolt cutting shaft, wherein the thread edge of the spiral cutting blade is used as a cutting edge, and the root of the spiral cutting blade is connected to the bolt cutting shaft in a sealing way to form a continuous spiral cutting groove, and the far end, the near end and the peripheral surface of the spiral cutting groove are all open; the bolt cutter (3) is made of flexible materials; when in use, the thrombus is pushed while rotating along the spiral direction, and the thrombus is cut into one or a plurality of strip-shaped thrombus with smaller diameter along the spiral cutting groove;
The working head (1) comprises a plurality of far-end separated nozzle petals (11) and a balloon part (12) arranged between two adjacent nozzle petals (11); the circumference of the distal end of the balloon portion (12) is greater than the circumference of the proximal end of the balloon portion (12) so that the distal end of the working head (1) expands into a horn shape after inflation of the balloon portion (12).
2. The flaring aspiration catheter with thrombolytic function of claim 1, wherein: the pipe orifice valve (11) is 3-6 pieces with equal size; the pipe orifice flaps (11) are equidistantly arranged along the circumferential direction of the working head (1), and the minimum interval of the central angles between the root parts of two adjacent pipe orifice flaps (11) is 15-120 degrees.
3. The flaring aspiration catheter with thrombolytic function of claim 1, wherein: along the circumferential direction of the suction catheter, when the working head (1) is not filled, the sum of the circumferential lengths of the distal ends of the balloon parts (12) is 30% -50% of the circumference of the distal ends of the working head (1).
4. A flaring aspiration catheter with thrombolytic function according to claim 3, characterized in that: the proximal end of the balloon part (12) is provided with a reserved slit (13) reaching the root of the orifice flap (11).
5. The flaring aspiration catheter with thrombolytic function of claim 1, wherein: the suction catheter wall comprises a supporting layer (15), a filling layer (16) and a covering layer (17) which are sequentially arranged from inside to outside; the supporting layer (15) comprises a supporting inner layer, a supporting reinforcing layer and a supporting outer layer which are sequentially arranged from inside to outside; the support reinforcing layer is internally provided with a metal wire braiding or spring winding structure which is cut off to the proximal end of the orifice valve (11), and the filling layer (16) is of a hollow structure and is arranged corresponding to the balloon part (12).
6. The flared suction catheter with thrombolysis function of claim 5, wherein: the filling fluid in the filling layer (16) is air or contrast fluid.
7. The flaring aspiration catheter with thrombolytic function of claim 1, wherein: the shape of the spiral cutting blade is integrally elliptic sphere/spindle type, mushroom head type, cone type or frustum type.
8. The flaring aspiration catheter with thrombolytic function of claim 1, wherein: the pitch of the spiral cutting blade is 3-10 mm, and the number of turns is 3-6.
9. The flaring aspiration catheter with thrombolytic function of claim 1, wherein: the advancing speed of the bolt cutter (3) is 2 mm/s-5 mm/s, and the rotating speed is 0.1rad/s-2rad/s; in use, the helical cutting groove of the thrombolytic device (3) is located outside the suction catheter, and the distance from the proximal end of the helical cutting groove to the distal orifice of the suction catheter cannot exceed 10mm.
CN202311145239.3A 2023-09-06 2023-09-06 Flaring suction catheter with bolt cutting function Active CN117137575B (en)

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