CN217186318U

CN217186318U - Thrombus taking device

Info

Publication number: CN217186318U
Application number: CN202220812517.0U
Authority: CN
Inventors: 孙海龙
Original assignee: Suzhou Hill Medical Technology Co ltd
Current assignee: Suzhou Hill Medical Technology Co ltd
Priority date: 2022-04-07
Filing date: 2022-04-07
Publication date: 2022-08-16
Anticipated expiration: 2032-04-07

Abstract

The utility model belongs to the technical field of medical instrument, concretely relates to thrombectomy device. It comprises a catheter, a spiral mechanism which can be led out from the inside of the catheter and advance, retreat and rotate in a blood vessel, a far-end protection mechanism arranged at the far end of the spiral mechanism, a near-end protection mechanism arranged at the far end of the catheter and a negative pressure mechanism communicated with the catheter. The utility model provides a technical scheme is through the screw mechanism that has certain intensity, can effectively collapse the more hard blockage in the blood vessel, through far and near protection mechanism, has effectively prevented the piece drift to other positions, forms the risk of new embolism, and it is external to shift out in the whole leading-in pipes of the material that will collapse that can more thoroughly be quick through negative pressure mechanism in addition.

Description

Bolt taking device

Technical Field

The utility model belongs to the technical field of medical instrument, concretely relates to get and tie device.

Background

The thrombus taking device is an instrument for removing obstructions in blood vessels, and generally removes the obstructions such as thrombus or plaque in the blood vessels by adopting dissolving, crushing, sucking, stent or basket and the like.

Current embolectomy devices generally include the following:

firstly, a recoverable support type: the recoverable stent is classified into a balloon type and a net cage type according to the stent structure. In which the balloon type is that after the catheter with the balloon is passed through the clot, the balloon is inflated, then the balloon and catheter are withdrawn, the clot is removed with the balloon, and the blood vessel resumes operation, such as that provided in chinese patent CN215778429U, which is a type of embolectomy device. The net-like cage type can be referred to Chinese patent CN107198554A, which is delivered to the clot site through a tube mesh stent, and is embedded in the clot after expansion so as to remove the clot.

Secondly, the suction formula: the aspiration catheter is brought into contact with the thrombus and then aspirated by negative pressure. For example, in chinese patent CN106037878A, clots dissociated in blood vessels are pumped out of the body by a negative pressure pump device.

The above-mentioned recoverable stent type or suction type cannot be applied to hard thrombus and can completely remove the defect of thrombus. Thrombus may also float to other vascular sites with the blood stream during thrombus removal resulting in re-thrombosis, which in severe cases may cause re-embolism or stroke.

SUMMERY OF THE UTILITY MODEL

The utility model provides a thrombectomy device for solve present thrombectomy device and can't be applicable to harder thrombus and thrombectomy in-process thrombus and collect incompletely, lead to its flow in other positions and cause the problem of new thrombus formation.

For convenience of explanation, the end close to the operator is defined as the near end, and the end far away from the operator is defined as the far end.

In order to solve the technical problem, the technical scheme of the utility model is that: the thrombus taking device comprises a catheter, a spiral mechanism which can be led out from the catheter to advance, retreat and rotate in a blood vessel, a far-end protection mechanism arranged at the far end of the spiral mechanism, a near-end protection mechanism arranged at the far end of the catheter and a negative pressure mechanism communicated with the catheter.

Optionally, the screw mechanism comprises a handle located outside the body, a flexible screw rod operated by the handle, and a helical blade disposed on a surface of the screw rod.

The spiral rod can be guided out of or withdrawn into the catheter through the control of the handle outside the body, in addition, the handle can enable the spiral rod to rotate in the blood vessel, and the spiral blade can effectively cut or decompose harder substances to be removed in the process, so that the substances can be conveniently removed.

Optionally, the distal end of the screw rod is provided with a guide frustum.

Optionally, the helical blade forms a single helix or a double helix structure on the surface of the screw rod, the helical blade is a single-layer helix or a multi-layer helix, and the helical blade has a uniform pitch or a variable pitch.

Optionally, the outer edge of the helical blade has a flat edge or a toothed edge.

Optionally, the helical rod is braided, coiled, serpentine or a multi-layer composite structure.

The screw rod can be a flexible part which is made of metal or high polymer material with ultrahigh flexibility and has flexibility and rigidity.

Optionally, the distal protection mechanism is in the shape of an umbrella, and includes an umbrella handle connected to the screw mechanism, a collapsible frame located at a distal end of the umbrella handle, and a mesh surface disposed on the frame.

Optionally, the proximal protection mechanism is an annular expandable mesh, an inner ring of the expandable mesh is fixed to the screw mechanism, an outer ring of the expandable mesh is fixed to the inner wall of the catheter, and the expandable mesh is received in a gap space between the catheter and the screw mechanism when contracted and located at the distal end of the catheter when expanded.

When the spiral mechanism is positioned in the catheter, the expandable net is in a contracted state and positioned in the gap space, and after the spiral mechanism is led out of the blood vessel, the expandable net is separated from the restraint of the catheter, and after being expanded, the expandable net is attached to the inner wall of the blood vessel, so that the blood vessel between the expandable net and the blood vessel is separated from other parts together with the far-end protection mechanism, and the blockage generated between the expandable net and the far-end protection mechanism is prevented from drifting out.

The utility model provides a technical scheme is through the screw mechanism that has certain intensity, can effectively collapse the more hard blockage in the blood vessel, through far and near protection mechanism, has effectively prevented the piece drift to other positions, forms the risk of new embolism, and it is external to shift out in the whole leading-in pipes of the material that will collapse that can more thoroughly be quick through negative pressure mechanism in addition.

Drawings

FIG. 1 is a schematic structural view of an embodiment of the thrombus removal device of the present invention;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is an enlarged view of portion B of FIG. 1;

fig. 4 is a schematic view of the annular expandable net according to the present invention in a deployed state.

Shown in the figure:

10-catheter, 20-screw mechanism, 21-screw rod, 22-screw blade, 23-guide frustum, 30-far-end protection mechanism, 31-umbrella handle, 32-framework, 33-net surface, 40-near-end protection mechanism, 41-inner ring and 42-outer ring.

Detailed Description

For ease of understanding, the embolectomy device is described below in conjunction with examples, which are intended to illustrate the present invention and are not intended to limit the scope of the invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations and positional relationships based on the orientation and positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "connected" are to be interpreted broadly, and may be, for example, a fixed connection, a detachable connection or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1, the embolectomy device comprises a catheter 10, a screw mechanism 20 which can be led out from the catheter 10 and can advance, retreat and rotate in a blood vessel, a distal end protection mechanism 30 arranged at the distal end of the screw mechanism 20, a proximal end protection mechanism 40 arranged at the distal end of the catheter 10 and a negative pressure mechanism (not shown) communicated with the catheter 10.

As shown in fig. 2, the screw mechanism 20 includes a handle (not shown) located outside the body, a flexible screw rod 21 operated by the handle, and a screw blade 22 provided on the surface of the screw rod 21, and a guide frustum 23 is provided at the distal end of the screw rod 21. The helical blade 22 may be a single helix or a double helix on the surface of the screw rod 21, and in this embodiment, the helical blade 22 may be a single-layer helix or a multi-layer helix, and in this embodiment, the helical blade is a single-layer helix, and the helical blade is a constant pitch or a variable pitch, and in this embodiment, the helical blade is set at a constant pitch, and the outer edge of the helical blade 22 has a flat edge or a tooth edge, and in this embodiment, the flat edge is provided.

As shown in fig. 3, the distal protection mechanism 30 has an umbrella shape, and includes an umbrella handle 31 connected to the screw rod 21, a collapsible frame 32 located at a distal end of the umbrella handle 31, and a net surface 33 provided on the frame 32. The umbrella-shaped distal protection mechanism 30 is in a thin tube state when being retracted, and when being released from an external protection structure thereof, the leakage net is supported by the memory shape of the framework 32 and is attached to the inner wall of a blood vessel or other lumens to form prepositive protection. The skeleton is made of shape memory material, and can be made by multi-strand weaving, winding or pipe cutting. The net surface can be a net fabric with micropores woven by high polymers or metals, and also can be a film with micropores obtained by punching a high polymer film.

As shown in FIG. 4, the proximal protection mechanism 40 is an annular expandable mesh, the inner ring 41 of which is fixed to the shaft 21 and the outer ring 42 of which is fixed to the inner wall of the catheter 10, and which is received in the interstitial space between the catheter and the helical mechanism when contracted and at the distal end of the catheter when expanded, as shown in FIG. 2.

The negative pressure mechanism is disposed in a conventional manner in the art, and generally includes a three-way valve disposed at the proximal end of the handle, a luer connector disposed on the three-way valve, the luer connector being connected to the inner cavity of the catheter 10, and a vacuum device, which may be a syringe or a vacuum pump. The negative pressure mechanism can suck the blockage in the closed area into the catheter and then move the blockage out of the body.

The spiral rod 21 is made of metal or high polymer materials, has ultrahigh flexibility, can be woven or wound by metal or high polymer materials, can also be a flexible snake bone structure cut by metal or high polymer materials, can also be a high polymer and metal material multilayer composite conduit, and the spiral blade 22 is made of metal or high polymer materials and can be integrally formed with the spiral rod 21.

It should be pointed out that the technical proposal provided by the utility model is not only suitable for the thrombus removal of cardiovascular and cerebrovascular arteries and veins, but also suitable for the thrombus removal of tumor embolism, and simultaneously can be used for the removal of calculi.

Get the working process brief of tying the device as follows:

the catheter enters into the body, when the catheter is about to reach the embolism, the position of the catheter is unchanged, the spiral mechanism continues to advance along the catheter to penetrate through the embolism to reach the rear end of the embolism, the released far-end protection mechanism and the released near-end protection mechanism limit the embolism objects between the far-end protection mechanism and the released near-end protection mechanism, the spiral rod is rotated at the moment, the spiral blades break up the embolism objects, the crushed substances are sucked into the catheter through the negative pressure mechanism, finally, the far-end protection mechanism, the spiral mechanism and the near-end protection mechanism withdraw into the catheter, meanwhile, the residual embolism objects are further guided into the catheter in the process of withdrawing the far-end protection mechanism, and finally, the residual embolism objects are moved out of the body along with the catheter.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: it is to be understood that modifications may be made to the above-described arrangements in the embodiments or equivalents may be substituted for some or all of the features thereof without departing from the scope of the present invention.

Claims

1. The thrombus taking device is characterized by comprising a catheter, a spiral mechanism which can be led out from the inside of the catheter and can advance, retreat and rotate in a blood vessel, a far-end protection mechanism arranged at the far end of the spiral mechanism, a near-end protection mechanism arranged at the far end of the catheter and a negative pressure mechanism communicated with the catheter.

2. The embolectomy device of claim 1, wherein the screw mechanism comprises a handle located outside the body, a flexible screw rod operated by the handle, and a helical blade disposed on a surface of the screw rod.

3. The embolectomy device of claim 2, wherein the distal end of the helical shaft is provided with a guide cone.

4. The embolectomy device of claim 2, wherein the helical blade forms a single helix or a double helix structure on the surface of the screw rod, the helical blade is a single-layer helix or a multi-layer helix, and the helical blade has a constant pitch or a variable pitch.

5. The embolectomy device of claim 2, wherein the outer edge of the helical blade has a flat edge or a toothed edge.

6. The embolectomy device of claim 1, wherein the distal protection mechanism is in the form of an umbrella comprising a shaft connected to a screw mechanism, a collapsible frame at the distal end of the shaft, and a mesh surface disposed on the frame.

7. The embolectomy device of claim 1, wherein the proximal protection mechanism is an annular expandable mesh, an inner ring of the expandable mesh is fixed to the screw mechanism, an outer ring of the expandable mesh is fixed to the inner wall of the catheter, and the expandable mesh is received in a gap space between the catheter and the screw mechanism when contracted and is located at the distal end of the catheter when expanded.