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CN115414580B - Thrombus aspiration catheter - Google Patents

Thrombus aspiration catheter Download PDF

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Publication number
CN115414580B
CN115414580B CN202211381814.5A CN202211381814A CN115414580B CN 115414580 B CN115414580 B CN 115414580B CN 202211381814 A CN202211381814 A CN 202211381814A CN 115414580 B CN115414580 B CN 115414580B
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Prior art keywords
catheter
thrombus
cavity
layer
thrombus aspiration
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CN115414580A (en
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成立萍
赵振心
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Skynor Medical Technology Shanghai Co ltd
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Skynor Medical Technology Shanghai Co ltd
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    • 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
    • A61M25/1011—Multiple balloon catheters
    • 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
    • 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
    • A61M25/0043—Catheters; Hollow probes characterised by structural features
    • A61M25/0045—Catheters; Hollow probes characterised by structural features multi-layered, e.g. coated
    • 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
    • A61M25/0067—Catheters; Hollow probes characterised by the distal end, e.g. tips
    • A61M25/0082—Catheter tip comprising a tool
    • 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
    • A61M25/104—Balloon catheters used for angioplasty
    • 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
    • A61B2017/22001—Angioplasty, e.g. PCTA
    • 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
    • A61B2017/22051—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 an inflatable part, e.g. balloon, for positioning, blocking, or immobilisation
    • A61B2017/22054—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 an inflatable part, e.g. balloon, for positioning, blocking, or immobilisation with two balloons
    • 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
    • A61B2017/22051—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 an inflatable part, e.g. balloon, for positioning, blocking, or immobilisation
    • A61B2017/22055—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 an inflatable part, e.g. balloon, for positioning, blocking, or immobilisation with three or more balloons
    • 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
    • A61B2017/22051—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 an inflatable part, e.g. balloon, for positioning, blocking, or immobilisation
    • A61B2017/22065—Functions of balloons
    • A61B2017/22067—Blocking; Occlusion
    • 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
    • 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
    • A61M25/1011—Multiple balloon catheters
    • A61M2025/1013—Multiple balloon catheters with concentrically mounted balloons, e.g. being independently inflatable
    • 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
    • A61M2025/1043—Balloon catheters with special features or adapted for special applications
    • A61M2025/1052—Balloon catheters with special features or adapted for special applications for temporarily occluding a vessel for isolating a sector
    • 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
    • A61M2205/00—General characteristics of the apparatus
    • A61M2205/75—General characteristics of the apparatus with filters
    • A61M2205/7545—General characteristics of the apparatus with filters for solid matter, e.g. microaggregates

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
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  • Child & Adolescent Psychology (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Surgical Instruments (AREA)
  • Media Introduction/Drainage Providing Device (AREA)

Abstract

The invention provides a thrombus suction catheter, which comprises a catheter seat, a stress release tube, a catheter body, a developing mark, a balloon and a blood filter screen, wherein when thrombus suction is carried out, the thrombus suction catheter can be used for plugging blood vessels so as to prevent broken fine thrombus from flowing to the blood vessels with smaller far ends; has great significance for reducing complications and improving the suction effect of thrombus.

Description

Thrombus aspiration catheter
Technical Field
The invention belongs to the technical field of medical instruments, and particularly relates to a thrombus aspiration catheter for cardiovascular intervention.
Background
Thrombi are small patches formed by the surface of blood flow at a denuded or repaired site within a blood vessel of the cardiovascular system. In variable fluid dependence, thrombi are composed of insoluble fibrin, deposited platelets, accumulated leukocytes and entrapped erythrocytes. If the thrombus forms blockage in the blood vessel of the human body, the blood flow is interrupted, and the diseases such as myocardial infarction, cerebral apoplexy and the like which can endanger life are easily caused.
At present, thrombolytic therapy is still the mainstream treatment mode for ischemic stroke, and has certain limitations, mainly embodied in short treatment time window and low revascularization rate. The mechanical thrombus removal treatment mode has obvious advantages in treatment effect, and the currently common mechanical thrombus removal mode is direct negative pressure suction of a suction catheter to suck thrombus out of a blood vessel so as to reconstruct the blood vessel.
When the suction catheter performs thrombus suction, a large amount of blood can be sucked out, so that the physical burden of a patient is increased, allogenic blood needs to be continuously supplemented in an operation, and the operation risk is increased; and in the thrombus suction process, the thrombus can be inevitably broken or fall off, if the broken small thrombus is not treated in time, the small thrombus easily flows to a narrower blood vessel at the far end along with the blood, and unpredictable risks are caused to a patient.
Meanwhile, when thrombus is sucked in a tortuous blood vessel, the sucked blood flow has a recoil effect on the catheter body, if the catheter body is not effectively supported or fixed, the catheter is easy to swing back and forth during suction, the blood vessel is damaged, even the swing amplitude is too large to deviate from a target suction area, the operation difficulty is increased, and the operation time is prolonged.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and designs a thrombus aspiration catheter which can be used for plugging a blood vessel when thrombus aspiration is carried out so as to prevent broken fine thrombus from flowing to the blood vessel with a smaller far end, more importantly, the thrombus aspiration catheter can intercept blood flow through a cone structure and ensure that the blood flows back to the blood vessel through a one-way valve at the tail end of a backflow cavity after the fine thrombus is removed by a filter screen, so that a large amount of blood is prevented from being aspirated, the physical burden of a patient is reduced, and the operation risk is greatly reduced; has great significance for reducing complications and improving the suction effect of thrombus. Meanwhile, the blood filter screen with the cone structure is added, so that the stability of the product is greatly enhanced, and the mechanical displacement of the catheter caused by blood suction is avoided or slowed down.
In order to achieve the purpose, the technical scheme of the invention is to provide a thrombus aspiration catheter, which comprises a catheter holder, a stress release tube, a catheter body and a developing mark, wherein the catheter holder is connected with the catheter body through the stress release tube, the catheter body consists of 3 parts of an inner tube, an intermediate layer and an outer tube, and the intermediate layer consists of a metal wire; the method is characterized in that: the outer pipe is composed of an inner layer and an outer layer, and a liquid through cavity is formed between the inner layer and the outer layer of the outer pipe; the side wall of the outer layer far end of the outer pipe is provided with a liquid through hole, and the outer side of the liquid through hole is provided with a saccule; the inner pipe consists of an inner layer and an outer layer, and the inner layer of the inner pipe forms a suction cavity; the catheter seat is provided with a main channel and a side channel, the main channel is connected with the suction cavity, and the side channel is connected with the liquid through cavity; a backflow cavity is formed between the inner layer and the outer layer of the inner pipe; the inner layer of the backflow cavity is provided with a one-way valve with a filter screen, and the one-way valve only allows blood to flow to the backflow cavity; the tail end of the backflow cavity is radially provided with a backflow one-way valve, and the one-way valve only enables blood to flow from the tail end of the backflow cavity to the blood vessel; the suction cavity has a conical configuration with gradually increasing diameter from the catheter seat to the tail end of the catheter; the proximal end of the reflux cavity is closed.
Furthermore, the pore size of the check valve with the filter screen is 5-260 μm, preferably 50-170 μm.
Furthermore, the suction cavity comprises a puncture needle, so that thrombus can be well locked after the thrombus is sucked into the catheter, and the effectiveness of thrombus suction is improved.
Furthermore, the proximal end of the puncture needle comprises an inverted conical support rod, and a plurality of inverted conical support rods can be arranged along the axial direction; furthermore, each 2~5 of the inverted conical support rods form a group.
Furthermore, the pipe materials of the inner pipe and the outer pipe are one or more of nylon, polyether block amide, polyurethane, polyolefin and polytetrafluoroethylene.
Furthermore, the metal wire of the middle layer is one or more of nickel-titanium alloy, nitinol, stainless steel, cobalt-chromium alloy and nickel-cobalt alloy.
Furthermore, the material of the filter screen on the inner tube is one or more of nickel-titanium alloy, stainless steel, nylon, cotton silk, silk and rayon.
Furthermore, the balloon is made of a compliant balloon; the saccule comprises at least 2 saccules which are continuously arranged; the balloon in the continuous arrangement has an effective length gradually decreasing from the proximal end to the distal end in the non-inflated state.
Further, the outer layer of the distal end of the catheter is coated with a hydrophilic coating.
Compared with the prior art, the invention has the following beneficial effects: when thrombus is sucked, the thrombus suction catheter can block blood vessels so as to prevent broken fine thrombus from flowing to the blood vessels with smaller far ends, more importantly, the thrombus suction catheter can intercept blood flow through a cone configuration and ensure that the blood flows back to the blood vessels after the fine thrombus is removed by a filter screen, so that a large amount of blood is prevented from being drawn out, the physical burden of a patient is reduced, and the operation risk is greatly reduced; has great significance for reducing complications and improving the suction effect of thrombus. Due to the blood filter screen with the cone configuration, the stability of the product is greatly enhanced, and the mechanical displacement effect of the blood flow suction on the catheter is avoided or slowed down. Meanwhile, the conical configuration of the blood filter screen gradually reduces the radial diameter from the far end to the near end in the thrombus suction process, so that blood can directly flow into the reflux cavity under the action of suction force, and thrombus is only sucked out of the body along the suction cavity under the action of the filter screen.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic view showing the construction of a thrombus aspiration catheter of the present invention.
FIG. 2 is a radial cross-sectional view of the thrombus aspiration catheter of the present invention.
FIG. 3 is a schematic view showing the structure of the inner tube of the thrombus aspiration catheter of the present invention.
FIG. 4 is a schematic view of the one-way valve at the end of the inner tube of the thrombectomy catheter of the present invention.
FIG. 5 is a schematic view showing the configuration of the inner tube including the puncture needle of the thrombus aspiration catheter of the present invention.
Fig. 6 is a schematic perspective view of the inner tube of the thrombus aspiration catheter of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In describing the embodiments of the present invention in detail, the drawings are not necessarily to scale, and the drawings are not intended to limit the invention.
Example 1
As shown in figures 1 and 2, the invention provides a thrombus aspiration catheter, which comprises a catheter holder 1, a stress release tube, a catheter body 2 and a developing mark 3, wherein the catheter holder is connected with the catheter body through the stress release tube, the catheter body consists of 3 parts of an inner tube 4, an intermediate layer 5 and an outer tube 6, and the intermediate layer consists of stainless steel wires; the side wall of the far end of the outer tube is provided with a liquid through hole 8; the balloon comprises 2 compliant balloons 9 which are arranged in series; and the effective length of the 2 balloons which are arranged in series is gradually reduced from the near end to the far end in the unfilled state; the sacculus is arranged at the outer side of the liquid through hole. When liquid is injected into the liquid through cavity 7 through the catheter seat, the saccule can block blood flow, so that tiny thrombus is prevented from flowing to the far end to cause blockage; meanwhile, 2 balloons which are arranged in series can play a further role in buffering, and can play a role in cutting off blood flow under the action of not damaging blood vessels.
As shown in figures 3, 4 and 5, the invention provides a thrombus suction catheter, wherein an inner tube consists of an inner layer and an outer layer, the inner layer of the inner tube forms a suction cavity 10, and a reflux cavity 11 is formed between the inner layer and the outer layer of the inner tube; the inner layer of the return cavity is provided with a one-way valve 12 with a filter screen, when thrombus is clinically sucked, blood directly acts with a cone shape 14 when the blood flow passes through the cone shape 14 with the radial diameter gradually reduced from the far end to the near end, and the one-way valve 12 only allows the blood to flow to the return cavity because the cone shape 14 is provided with the one-way valve 12 with the filter screen; then flows back to the blood vessel through a backflow one-way valve 13 at the tail end of the backflow cavity; the suction cavity can contain a puncture needle 16, thrombus can be well fixed on the puncture needle after being sucked, and meanwhile, in order to further lock the thrombus, an inverted conical support rod 17 can be arranged on the puncture needle 16, so that the thrombus can be prevented from falling off after being sucked. The proximal end 15 of the flashback chamber is sealed. The aperture of a filter screen of the backflow cavity one-way valve is 170 mu m; the filter screen is made of cotton silk.
The inner pipe is made of polytetrafluoroethylene; the outer pipe is made of polyether block amide and polyurethane. The outer layer of the far end of the catheter is coated with a polyvinylpyrrolidone hydrophilic coating.
Example 2
As shown in FIG. 1, the present invention provides a thrombus aspiration catheter comprising a catheter hub 1, a stress relief tube, a catheter body 2, and a visualization mark 3; as shown in fig. 2, the catheter holder is connected with the catheter body through the stress release tube, the catheter body is composed of an inner tube 4, a middle layer 5 and an outer tube 6, the inner cavity of the inner tube is a suction cavity 10, a liquid through cavity 7 is formed between the inner tube and the outer tube, the catheter holder is provided with a main channel and a side channel, the main channel is connected with the suction cavity, the side channel is connected with the liquid through cavity, when reagents such as contrast agents or physiological saline are poured into the side channel, the reagents enter the balloon through liquid through holes, the balloon can expand to block blood vessels, and the risk that thrombus escapes to a far-end blood vessel is prevented.
As shown in fig. 3 and 4, the inner lumen of the inner tube is provided with a one-way valve 12 containing a blood filter, the distal section of the filter is connected with the distal end of the catheter and contains a blood outflow one-way valve 13, and the blood filter is in a conical configuration 14 with the diameter gradually increasing from the proximal end to the distal end; the near-end of the filter screen is of a closed structure, and the filter screen is made of a mixture of nickel-titanium alloy and silk.
The aperture of the cone-shaped part of the one-way valve containing the filter screen is 200 μm, and as shown in fig. 6, the blood filter screen of the inner lumen of the inner tube containing the one-way valve is in a cone structure.
As shown in FIG. 5, the thrombus aspiration catheter contains a puncture needle 16, and can fix well the aspirated thrombus at the time of thrombus aspiration. Meanwhile, the proximal end of the puncture needle 16 comprises an inverted conical support rod 17, so that thrombus can be further embolized.
The inner tube of the thrombus aspiration catheter is made of polytetrafluoroethylene, and the outer tube of the thrombus aspiration catheter is made of nylon and polyether block amide; the middle material of the thrombus aspiration catheter is nickel-titanium alloy wire; the development mark is platinum-iridium alloy.
Furthermore, the balloon is made of a compliant balloon; the saccule comprises 3 saccules which are continuously arranged; the balloon in the continuous arrangement has an effective length gradually decreasing from the proximal end to the distal end in the non-inflated state.
Further, the outer layer of the distal end of the catheter is coated with a hyaluronic acid hydrophilic coating.
Example 3
As shown in fig. 1 and 2, the present invention provides a thrombus aspiration catheter comprising a catheter hub 1, a stress relief tube, a catheter body 2, and a visualization mark 3; the catheter seat is connected with a catheter body through a stress release pipe, the catheter body is composed of an inner pipe 4, an intermediate layer 5 and an outer pipe 6, the outer pipe is made of polyether block amide, the inner pipe is made of polytetrafluoroethylene, the intermediate layer is made of nickel-titanium alloy, and the developing mark is made of platinum-tungsten alloy; as shown in fig. 3, 4 and 5, the inner layer of the inner tube is a blood filter screen of a one-way valve, when thrombus is sucked, the thrombus enters a suction cavity, and the blood enters a return cavity after being filtered; the tail end of the backflow cavity is provided with a one-way valve for flowing out of the blood vessel, and the filtered blood entering the backflow cavity can flow to the blood vessel through the tail end one-way valve; simultaneously, the cavity of leading to between the ectonexine through the outer tube carries out being no less than 2 sacculus of continuous arrangement sufficient for the sacculus can be fine carries out the shutoff to the blood vessel, has avoided the escape of broken tiny thrombus to distal end blood vessel.
As shown in fig. 5, 3 inverted conical support rods are arranged in the thrombus suction catheter, so that the sucked thrombus can be locked, and the thrombus suction effectiveness can be ensured.
As shown in FIG. 6, the aperture of the blood filter screen is 150 μm, and the aperture of the brim of the blood filter screen is 70 μm.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.

Claims (10)

1. A thrombus aspiration catheter comprises a catheter seat (1), a stress release tube, a catheter body (2) and a development mark (3), wherein the catheter seat is connected with the catheter body through the stress release tube, the catheter body consists of 3 parts of an inner tube (4), an intermediate layer (5) and an outer tube (6), and the intermediate layer consists of metal wires; the method is characterized in that: the outer pipe is composed of an inner layer and an outer layer, and a liquid through cavity (7) is formed between the inner layer and the outer layer of the outer pipe; the side wall of the outer layer far end of the outer pipe is provided with a liquid through hole (8), and the outer side of the liquid through hole is provided with a saccule (9); the inner pipe consists of an inner layer and an outer layer, and the inner layer of the inner pipe forms a suction cavity (10); the catheter seat is provided with a main channel and a side channel, the main channel is connected with the suction cavity, and the side channel is connected with the liquid through cavity; a reflux cavity (11) is formed between the inner layer and the outer layer of the inner pipe; the inner layer of the return cavity is provided with a one-way valve (12) with a filter screen, and the one-way valve only allows blood to flow to the return cavity; the tail end of the backflow cavity is radially provided with a backflow one-way valve (13), and the one-way valve only enables blood to flow from the tail end of the backflow cavity to the blood vessel; said aspiration lumen has a conical configuration (14) of increasing diameter from the catheter hub to the catheter tip; the proximal end (15) of the flashback chamber is sealed.
2. A thrombus aspiration catheter according to claim 1, wherein: the aperture of the check valve with the filter screen is 5-260 mu m.
3. A thrombus aspiration catheter according to claim 1, wherein: the aspiration lumen contains a puncture needle (16).
4. A thrombus aspiration catheter according to claim 3, wherein: the proximal end of the puncture needle comprises an inverted conical support rod (17).
5. A thrombus aspiration catheter according to claim 1, wherein: the inner pipe and the outer pipe are made of one or more of nylon, polyether block amide, polyurethane, polyolefin and polytetrafluoroethylene.
6. A thrombus aspiration catheter according to claim 1, wherein: the metal wire of the middle layer is one or more of nickel-titanium alloy, nitinol, stainless steel, cobalt-chromium alloy and nickel-cobalt alloy.
7. A thrombus aspiration catheter according to claim 1, wherein: the balloon is made of a compliant balloon.
8. A thrombus aspiration catheter according to claim 7, wherein: the sacculus comprises not less than 2 sacculus that arrange in succession.
9. A thrombus aspiration catheter according to claim 8, wherein: the balloon arranged in series gradually decreases in effective length from the proximal end to the distal end in the unfilled state.
10. A thrombus aspiration catheter according to claim 1, wherein: the outer layer of the far end of the catheter is coated with a hydrophilic coating.
CN202211381814.5A 2022-11-07 2022-11-07 Thrombus aspiration catheter Active CN115414580B (en)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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