CN110755133A - Rotary cutting device - Google Patents

Abstract

The invention relates to the technical field of medical equipment, in particular to a rotary cutting device. The cutting assembly comprises a cutting assembly extending into a blood vessel and used for cutting, a driving device for driving the cutting assembly to act, and a protective sleeve arranged relative to the cutting assembly, wherein the head of the cutting assembly is located on the inner side of the protective sleeve relative to the extending direction of the blood vessel. The rotary cutting device has the advantage of not damaging the inner wall of the blood vessel in the rotary cutting treatment process.

Description

Rotary cutting device

Technical Field

The invention relates to the technical field of medical equipment, in particular to a rotary cutting device.

Background

Peripheral blood vessel thrombus occlusion is mainly caused by thrombus formation due to slow blood flow and change of blood viscosity, which are caused by blood vessel stenosis or occlusion caused by atherosclerosis, atrial thrombus shedding and the like. In recent years, the application of endovascular techniques in the treatment of arteriosclerotic occlusive diseases has tended to be widespread, and the development thereof has gone through major stages of percutaneous transluminal angioplasty, stenting, volume reduction techniques, and the like. In the case of old intravascular thrombi, atherectomy treatment of diseased vessel thrombi or plaques is generally required, and devices such as the prior patent document CN101795630B, atherectomy device, system and method, and CN103957825B, atherectomy device, system and method are used, but although the intravascular rotary atherectomy has the advantages of small wound, fast recovery, positive recent curative effect and the like, the drawbacks still exist. Due to the reasons of stenosis of a diseased blood vessel, complex position of thrombus lesion and the like, the inner wall of the blood vessel at the diseased part is easy to be damaged in the rotary cutting process of thrombus, even the inner wall of the blood vessel is penetrated, so that serious consequences are caused.

Disclosure of Invention

Therefore, the technical problem to be solved by the present invention is to overcome the defect that the atherectomy device in the prior art may damage the inner wall of the blood vessel, thereby providing an atherectomy device that does not damage the inner wall of the blood vessel during the atherectomy procedure.

In order to solve the problems, the rotary cutting device comprises a cutting assembly extending into a blood vessel for cutting, a driving device for driving the cutting assembly to act, and a protective sleeve arranged opposite to the cutting assembly, wherein the head of the cutting assembly is positioned at the inner side of the protective sleeve relative to the extending direction of the blood vessel.

The head of the protective sheath is 1 mm-2 mm longer than the cutting assembly in the direction of extension of the blood vessel.

The head of the protective sleeve is provided with a bending part bending towards the inner side of the protective sleeve.

The cross section of protective sheath is the arc, cutting assembly is located the curved inboard.

The protective sleeve is 1/3 circular in cross section.

The cutting assembly and the protective sleeve are fixedly arranged on the guide catheter, and the protective sleeve is located on the outer side of the cutting assembly.

A gap is provided between the protective sheath and the cutting assembly.

The gap is 1/4-1/2 of the cutting assembly height in the cross-sectional direction of the protective sheath.

The cutting assembly comprises a body fixedly connected with the guide catheter and an outer cutter head arranged at one end of the body far away from the guide catheter, and the outer cutter head can rotate around the axis of the body relative to the body.

The cutting assembly further comprises a conveying piece fixedly connected with the outer cutter head and driven to rotate by a driving device, a containing cavity for installing the conveying piece is formed in the body, one side, far away from the protective sleeve, of the body is provided with a strip hole extending in the length direction of the body and penetrating through the side wall of the containing cavity, and an inner cutter head is arranged on the hole wall of the strip hole.

The conveying member is a spiral conveying spring.

The technical scheme of the invention has the following advantages:

1. the rotary cutting device comprises a cutting assembly extending into a blood vessel and used for cutting, a driving device for driving the cutting assembly to act, and a protective sleeve arranged relative to the cutting assembly, wherein the head of the cutting assembly is positioned at the inner side of the protective sleeve relative to the extending direction of the blood vessel. The rotary cutting device has simple structure and easy operation; the rotary cutting device is easy to pass through blood vessels due to the arrangement of the protective sleeve, so that the advancing resistance is reduced; the thrombus suction efficiency is high, and the patency rate is high. In the process of thrombectomy, the protective sleeve can protect the inner wall of the blood vessel with less thrombus or plaque, and avoids trauma to the blood vessel at the pathological change position.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic structural view of a rotary cutting apparatus according to the present invention;

description of reference numerals:

1-protective sleeve; 2-a guide catheter; 3-inner cutter head; 4-external cutter head; 5-a conveying member; 6-long holes; 7-a bend; 8-body.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable 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 meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

The rotary-cut device of the present embodiment, as shown in fig. 1, includes a cutting assembly, a guidingcatheter 2, a driving device and a protectingsheath 1, the cutting assembly and the protectingsheath 1 are fixedly disposed at an end portion of the guidingcatheter 2 extending into a blood vessel, and a portion of the driving device is disposed in the guidingcatheter 2 and is in transmission connection with the cutting assembly to drive the cutting assembly to move.

The cutting assembly is used for cutting thrombus and the like in a blood vessel and comprises abody 8, anouter cutter head 4, aninner cutter head 3 and aconveying piece 5. One end of thebody 8 is fixedly connected with the end part of theguide catheter 2, a containing cavity is arranged in thebody 8, aconveying piece 5 which is connected with the driving device and driven by the driving device to rotate is arranged in the containing cavity, and the other end of theconveying piece 5 is fixedly connected with anouter cutter head 4. Theouter cutter head 4 is arranged at the other end of thebody 8 far away from theguide catheter 2, and theouter cutter head 4 can rotate around the axis of thebody 8 relative to thebody 8 and is connected with thebody 8 in a rotating way. In this embodiment, thebody 8 and theouter cutter head 4 are cylindrical.

One side of thebody 8, which is far away from theprotective sleeve 1, is provided with astrip hole 6 which extends along the length direction of thebody 8 and penetrates through the side wall of the accommodating cavity, aninner cutter head 3 is arranged on the hole wall of thestrip hole 6, and cut thrombus and the like can enter the accommodating cavity through thestrip hole 6 and are conveyed out of the body by a conveyingpiece 5. In this embodiment, the conveyingmember 5 is a spiral conveying spring.

One end of theprotective sleeve 1 is fixedly connected with the end part of theguide catheter 2, one side of the cutting component far away from theguide catheter 2 is a head part, namely the end part of the outer cutter head far away from theguide catheter 2, and the end part is positioned at the inner side of theprotective sleeve 1 relative to the extending direction of the blood vessel. In this embodiment, the head of theprotective sheath 1 remote from the guidingcatheter 2 is 1 mm-2 mm longer than the cutting assembly in the direction of extension of the blood vessel. This length makes the protective sheath easily through the blood vessel of bending section, reaches the anterior segment of thrombus, at the rotary cut thrombus in-process, protects one side vascular inner wall, prevents to pierce through the blood vessel and causes the hemorrhage. The head of theprotective sleeve 1 is provided with abending part 7 which is bent towards the inner side of theprotective sleeve 1, thebending part 7 is arranged, the rotary cutting device can conveniently advance, blood vessels cannot be accidentally injured in the advancing process, and the inner wall of the blood vessel at the pathological change position is protected.

In this embodiment, the cross-section of theprotective sheath 1 is 1/3 circular, that is, the cross-section is arc-shaped, and the cutting assembly is located inside the arc-shaped. Theprotective sleeve 1 is designed into 1/3 round shape, which not only protects the inner wall of the blood vessel without thrombus, but also makes the other side of the cutter head cut and removed at the thrombus. The material ofprotective sheath 1 is stainless steel or macromolecular material.

There is a gap between theprotective sheath 1 and the cutting assembly. The gap is 1/4-1/2 of the cutting assembly height in the cross-sectional direction of theprotective sheath 1. When the operation is carried out, the cutting assembly and theprotective sleeve 1 can be developed, the gap is arranged and is arranged relative to the height of the cutter head, so that theprotective sleeve 1 and the cutting assembly are convenient to develop and identify, and the operation in the operation process is convenient. Simultaneously, this clearance can prevent that thrombus etc. from pluggingprotective sheath 1 with cutting assembly leads to outer tool bit can not cut the thrombus.

In this embodiment, the connection position of theprotective sheath 1 and the guidingcatheter 2 is close to the outer ring of the guidingcatheter 2, so as to reduce the volume of the portion of the atherectomy device extending into the blood vessel.

When the rotary-cut device is used, when the cutting assembly extends into a blood vessel, under X-ray radiography, the positions of the cutting assembly and theprotective sleeve 1 can be seen due to the developing effect, after theprotective sleeve 1 is moved to a thrombus or plaque, theprotective sleeve 1 faces the blood vessel wall with less thrombus or less plaque through rotation, the cutting device faces the blood vessel wall with thick thrombus or plaque, then the driving device is started to carry out rotary-cut on the thrombus or plaque through the conveyingpiece 5 and theexternal cutter head 4, and meanwhile, theinternal cutter head 3 also carries out cutting. Theinner cutter head 3 and theouter cutter head 4 form shearing force, so that thrombus or plaque can be efficiently removed in a rotating mode, and if the thrombus is too large or fibrous tissues clamp the catheter head, the thrombus or plaque can be removed through reverse rotation. In the cutting process, the circular arc-shapedprotective sleeve 1 outside theouter cutter head 4 can protect the inner wall of a blood vessel, the cutting assembly is prevented from rotating in the rotary thrombectomy, the injury is caused on one side of the blood vessel without thrombus or with small thrombus, and then the cut scraps are sent out of the body along the conveyingpiece 5, so that the blockage of the tiny blood vessel at the far end can be avoided. The rotary cutting device is safe and effective, has small operation wound, quick postoperative recovery, less bleeding and high unobstructed rate.

The rotary cutting device has simple structure and easy operation; the device is suitable for blood vessels with the diameter of more than 3mm, and the device can easily pass through the blood vessels, so that the advancing resistance is reduced; the thrombus suction efficiency is high, and the patency rate is high. In the process of thrombectomy, theprotective sleeve 1 can protect the inner wall of the blood vessel with less thrombus or plaque, and avoids trauma to the blood vessel at the pathological change position.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims (11)

1. A rotary cutting device comprises a cutting assembly extending into a blood vessel and used for cutting, and a driving device used for driving the cutting assembly to act, and is characterized by further comprising a protective sleeve (1) arranged opposite to the cutting assembly, wherein the head of the cutting assembly is located on the inner side of the protective sleeve (1) relative to the extending direction of the blood vessel.

2. Rotational atherectomy device according to claim 1, wherein the head of the protective sheath (1) is 1 mm-2 mm longer than the cutting assembly in the direction of extension of the blood vessel.

3. Rotational atherectomy device according to claim 1 or 2, wherein the protective sheath (1) is provided with a curved section (7) at the head section, which is curved towards the inside of the protective sheath (1).

4. Rotational atherectomy device according to any of claims 1-3, wherein the protective sheath (1) has an arc-shaped cross-section, and the cutting assembly is located inside the arc.

5. Rotational atherectomy device according to claim 4, wherein the protective sheath (1) has a circular cross-section of 1/3.

6. Rotational atherectomy device according to any of claims 1-5, wherein the cutting assembly and the protective sheath (1) are fixedly mounted on a guiding catheter (2), the protective sheath (1) being located outside the cutting assembly.

7. An rotational atherectomy device according to claim 6, wherein a gap is provided between the protective sheath (1) and the cutting assembly.

8. Rotational atherectomy device according to claim 7, wherein the gap is 1/4-1/2 of the cutting assembly height in the cross-sectional direction of the protective sheath (1).

9. A rotary cutting apparatus according to any one of claims 1-8, wherein the cutting assembly comprises a body (8) fixedly connected to the guide catheter (2), and an outer cutter (4) disposed at an end of the body (8) remote from the guide catheter (2), the outer cutter (4) being rotatable relative to the body (8) about an axis of the body (8).

10. A rotary cutting device according to claim 9, wherein the cutting assembly further comprises a conveying member (5) fixedly connected to the outer cutter head (4) and driven by a driving device to rotate, a cavity for mounting the conveying member (5) is provided in the body (8), a long hole (6) extending along a length direction of the body (8) and penetrating through a side wall of the cavity is provided on one side of the body (8) away from the protective sheath (1), and an inner cutter head (3) is provided on a wall of the long hole (6).

11. A rotational atherectomy device according to claim 10, wherein the delivery member (5) is a coil delivery spring.

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