An intraluminal opening device for vascular occlusive lesions

Abstract

The present invention discloses an intraluminal opening device for vascular occlusive lesions, comprising an inner catheter and an outer catheter, wherein a grinding device is inserted into the inner catheter, and an operating device connected to the grinding device and suitable for controlling the action of the grinding device is provided at the proximal end of the inner catheter; the outer catheter comprises a grinding cavity, a balloon cavity and a suction cavity, wherein the inner catheter is inserted into the grinding cavity and extends out of the distal end of the grinding cavity; the distal end of the outer catheter is provided with a suction port connected to the suction cavity, and the rear part of the suction port is provided with a balloon connected to the balloon cavity; the proximal end of the outer catheter is provided with a pressure valve interface connected to the balloon cavity and a suction interface connected to the suction cavity, and the suction interface is connected to the suction device through a catheter. The present invention can efficiently remove calcified plaques or thrombi that cause lumen occlusion in blood vessels, and can effectively prevent plaque or thrombus fragments from flowing to the distal end with blood, thereby avoiding distal embolism.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and in particular to an intracavitary opening device for vascular occlusive lesions. Background Art

[0002] Endovascular treatment refers to the use of special endovascular surgical instruments to puncture the body surface into the blood vessels and reach the location of vascular lesions to complete the corresponding surgical operations. At present, endovascular treatment has become the preferred treatment for most vascular diseases. Various types of endovascular treatment instruments accompanied by corresponding treatment methods can basically meet the needs of most endovascular surgeries. Its safety, minimally invasive and simple advantages are prompting it to gradually replace traditional open surgery.

[0003] However, the existing intracavitary treatment still has unavoidable disadvantages. The purpose of treating some vascular occlusive diseases faced in clinical work, such as arteriosclerotic occlusive disease or venous thrombosis, is to restore the occluded blood vessel lumen through surgery and then restore normal blood flow. The existing intracavitary treatment methods require first performing intracavitary opening - using the corresponding instruments to pass through the occlusive lesions, establish a treatment track in the proximal and distal true lumen (true lumen) of the lesion, and then proceed to the next step of lesion treatment, including balloon dilatation, thrombus aspiration, stent forming, etc. However, in actual surgical operations, the existing intracavitary treatment instruments are often unable to complete effective intracavitary opening because the lesions themselves are too tough - such as severely calcified atherosclerotic plaques or severely organized thrombi, which ultimately leads to treatment failure. Summary of the invention

[0004] The purpose of the present invention is to address the deficiencies of the prior art and to propose an intraluminal opening device for vascular occlusive lesions, which can effectively remove tough lesions (calcified plaques or organized thrombi) that block blood vessels when a true lumen track cannot be established, and can also effectively prevent plaque or thrombus fragments from flowing to the distal end with the blood, thereby avoiding distal embolism.

[0005] The technical solution to achieve the purpose of the present invention is:

[0006] An intracavitary opening device for vascular occlusive lesions comprises an inner catheter and an outer catheter, wherein a grinding device is inserted into the inner catheter, and an operating device connected to the grinding device and suitable for controlling the action of the grinding device is provided at the proximal end of the inner catheter; the outer catheter comprises a grinding cavity, a balloon cavity and a suction cavity, and the inner catheter is inserted into the grinding cavity and extends out of the distal end of the grinding cavity; a suction port connected to the suction cavity is provided at the distal end of the outer catheter, and a balloon connected to the balloon cavity is provided at the rear of the suction port; a pressure valve interface connected to the balloon cavity and a suction interface connected to the suction cavity are provided at the proximal end of the outer catheter, and the suction interface is connected to the suction device through a catheter.

[0007] Furthermore, the grinding device includes a rotating shaft and a grinding head fixed at the far end of the rotating shaft; the rotating shaft is outer-circuited with an insulating protective sheath.

[0008] Furthermore, it also includes a mesh protection sleeve which is arranged at the rear end of the balloon and fixed on the outer catheter and is in a contracted or expanded state.

[0009] Furthermore, the mesh protection sleeve is in a funnel shape in an expanded state, and the outer diameter of the front end of the mesh protection sleeve after expansion is the same as the outer diameter of the balloon after expansion.

[0010] Furthermore, the operating device includes an operating handle and a motor, the interior of the operating handle is provided with a through hole that runs through the front and back and connects to the inner conduit; the operating handle is also provided with an annular boss; the motor is electrically connected to the grinding head and controls the rotation of the grinding head.

[0011] Furthermore, the motor is provided with a foot switch.

[0012] Furthermore, the front end of the grinding head is chamfered in an arc shape.

[0013] Furthermore, the maximum outer diameter of the grinding head is smaller than the inner diameter of the inner conduit.

[0014] By adopting the above technical solution, the present invention has the following beneficial effects:

[0015] The present invention can grind calcified plaques or organized thrombi by arranging a grinding device in the inner catheter, and the suction device timely absorbs the ground thrombus fragments through the suction port; at the same time, a balloon is provided on the outer catheter, and before grinding the lesion, the balloon is first expanded so that the outer wall of the balloon is closely attached to the inner wall of the blood vessel, thereby temporarily blocking the blood flow and preventing the fragments formed after the lesion grinding from flowing with the blood to cause distal embolism.

[0016] The rear end of the balloon of the present invention is provided with a mesh protection sleeve fixed on the outer catheter. When the balloon expands, the mesh protection sleeve opens with the balloon expansion to block the solid components exceeding the mesh diameter that accidentally fall out of the blood, preventing them from entering the blood vessel cavity with a smaller diameter at the distal end with the blood flow and causing acute embolism.

[0017] The mesh protective sleeve of the present invention is funnel-shaped after opening, and only the outer diameter of the front end is the same as the outer diameter of the balloon, so as to avoid the outer wall of the mesh protective sleeve contacting the blood vessel wall and causing the blood vessel wall to bear excessive pressure, thereby reducing the risk of damage to the blood vessel wall.

[0018] The operating handle of the present invention is provided with an annular boss, which is convenient for holding the operating handle to realize manual pushing and moving of the grinding device. At the same time, a motor is provided to control the rotation of the grinding head to facilitate grinding of lesions. At the same time, the operating handle is provided with a through hole to facilitate the insertion of a guide wire.

[0019] The motor of the present invention is provided with a foot switch, which is convenient for the operator to control the start and stop of the motor during surgery.

[0020] The front end of the grinding head of the present invention is chamfered in an arc shape to avoid scratching the blood vessel wall.

[0021] The maximum outer diameter of the grinding head of the present invention is smaller than the inner diameter of the inner catheter, and the grinding head can be retracted into the inner cavity of the inner catheter, so that the device can be smoothly moved forward to the lesion site in the blood vessel, protecting the grinding head while avoiding damage to the blood vessel wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings, wherein:

[0023] Figure 1 It is a structural schematic diagram of the present invention;

[0024] Figure 2 It is a schematic diagram of the structure after the balloon of the present invention is expanded.

[0025] The reference numerals in the accompanying drawings are:

[0026] Inner catheter 1, outer catheter 2, grinding device 3, rotating shaft 3-1, grinding head 3-2, insulating protective sheath 3-3, operating device 4, operating handle 4-1, motor 4-2, through hole 4-3, annular boss 4-4, foot switch 4-5, suction port 5, balloon 6, mesh protective sleeve 7, pressure valve interface 8, suction interface 9, suction device 10. DETAILED DESCRIPTION

[0027] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0028] (Example 1)

[0029] See Figure 1 to Figure 2 The intracavitary opening device for vascular occlusive lesions of this embodiment includes an inner catheter 1 and an outer catheter 2. A grinding device 3 is inserted into the inner catheter 2, and the grinding device 3 includes a rotating shaft 3-1 and a grinding head 3-2 fixed at the distal end of the rotating shaft 3-1. The rotating shaft 3-1 is also covered with an insulating protective sheath 3-3 made of rubber material. The maximum outer diameter of the grinding head 3-2 is smaller than the inner diameter of the inner catheter 1 and the front end of the grinding head 3-2 is chamfered in an arc, so that the grinding head 3-2 can be retracted into the inner cavity of the inner catheter 1, so that the device can be smoothly moved forward to the lesion in the blood vessel, and the grinding head 3-2 can be protected while avoiding damage to the blood vessel wall.

[0030] The proximal end of the inner catheter 3 is provided with an operating device 4 connected to the grinding device 3, which is used to control the movement of the grinding head 3-2. The operating device 4 includes an operating handle 4-1 and a motor 4-2. The inside of the operating handle 4-1 is provided with a through hole 4-3 that runs through the front and back and connects to the inner catheter 1, which is convenient for inserting a guide wire. The operating handle 4-1 is also provided with an annular boss 4-4, which is convenient for holding the operating handle 4-1 and controlling the forward and backward movement of the grinding head 3-2 by manually pushing the operating handle. The motor 4-2 is electrically connected to the grinding head 3-2 and controls the grinding head 3-2 to rotate. The motor 4-2 is provided with a foot switch 4-5, which is convenient for the operator to control the start and stop of the motor during surgery.

[0031] The outer catheter 2 includes a grinding chamber, a balloon chamber and a suction chamber, and the inner catheter 1 is inserted into the grinding chamber and extends out of the distal end of the grinding chamber. The distal end of the outer catheter 2 is provided with a suction port 5 connected to the suction chamber, and the rear part of the suction port 5 is provided with a balloon 6 connected to the balloon chamber. The balloon 6 is coated with a platinum-iridium alloy radiopaque marker coating from the distal end to the proximal end, and is made of Pebax7033 and Vestamid L2101F. The balloon 6 is wrapped on the outside of the outer catheter 2 in a vacuum state, and the two ends of the balloon are close to the middle of the balloon 2 cm, and the two ends of the balloon 6 are respectively fixed with a hoop-shaped nickel-titanium alloy material. The rear end of the balloon 6 is provided with a mesh protective sleeve 7 fixed on the outer catheter 2 in a contracted or expanded state, the proximal end of the mesh protective sleeve 7 is fixedly connected to the outer catheter 2, and the distal end is fixedly connected to the balloon 6 through an elastic ring. The mesh protective sleeve 7 adopts a spandex woven mesh structure, and the mesh diameter is less than 110 microns. The mesh protective sleeve 7 opens as the balloon 6 expands, and the mesh protective sleeve 7 is funnel-shaped in the expanded state. At this time, the outer diameter of the front end of the mesh protective sleeve 7 is the same as the outer diameter of the balloon 6, which prevents the outer wall of the mesh protective sleeve from contacting the blood vessel wall and causing the blood vessel wall to be subjected to excessive pressure, thereby reducing the risk of damage to the blood vessel wall.

[0032] The proximal end of the outer catheter 2 is provided with a pressure valve interface 8 connected to the balloon cavity and a suction interface 9 connected to the suction cavity. The suction interface 8 is connected to a suction device 10 through a catheter.

[0033] The working principle of this embodiment:

[0034] When in use, the device follows the guide wire to the lesion by running the guide wire in the through hole 4-3 of the operating handle 4-1 of this embodiment, and firstly connects an external filling device, such as a pressure pump, through the pressure valve interface 8 to expand the balloon 6. At this time, the balloon expands the blood vessel to the blood vessel wall, and closes the pressure valve to keep the balloon 6 filled, playing the role of fixing the device and blocking the blood flow. At the same time, the mesh protection sleeve 7 connected to the balloon 6 expands with the expansion of the balloon 6 to form a funnel shape, blocking the solid components that accidentally fall out of the blood and exceed the mesh diameter, and preventing them from entering the distal blood vessel cavity with a smaller diameter with the blood flow to cause acute embolism.

[0035] Push the operating handle 4-1 to push the grinding head 3-2 out of the sheath of the inner catheter 1. Then, step on the foot switch 4-5 to start the grinding head 3-2 to rotate and slowly grind the occlusive lesions blocking the blood vessels, especially some hard plaques with severe calcification. At the same time, turn on the suction device 10, repeatedly inject physiological saline or medicine through the suction port 5 and perform suction to suck out the ground lesions. In this way, the blocked blood vessels can be opened continuously.

[0036] In this embodiment, a grinding head 3-2 is arranged at the distal end of the inner catheter 1, so that occlusive lesions in the blood vessels can be ground, and the suction device 10 absorbs the ground lesion fragments in time through the suction port 5; at the same time, a balloon 6 is arranged on the outer catheter 2. Before the lesion is ground, the balloon 6 is first expanded so that the outer wall of the balloon 6 is closely attached to the inner wall of the blood vessel, thereby temporarily blocking the blood flow and preventing the ground lesion fragments from flowing with the blood and causing distal embolism.

[0037] (Example 2)

[0038] The structure of this embodiment is basically the same as that of the embodiment, except that the material of the mesh protective sleeve 7 is nickel-titanium alloy, which has better blood vessel support, and adopts a tightly woven mesh elastic structure. The braided strips are not connected to each other and can undergo elastic expansion and deformation.

[0039] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An intraluminal opening device for vascular occlusive lesions, characterized in that: The invention comprises an inner catheter (1) and an outer catheter (2), wherein a grinding device (3) is inserted into the inner catheter (1), and an operating device (4) connected to the grinding device (3) and suitable for controlling the operation of the grinding device (3) is provided at the proximal end of the inner catheter (1); the outer catheter (2) comprises a grinding chamber, a balloon chamber and a suction chamber, and the inner catheter (1) is inserted into the grinding chamber and extends out of the distal end of the grinding chamber; the distal end of the outer catheter (2) is provided with a suction port (5) connected to the suction chamber, and the rear part of the suction port (5) is provided with a balloon (6) connected to the balloon chamber; the rear end of the balloon (6) is provided with a mesh protective sleeve (7) fixed on the outer catheter (2) in a contracted or expanded state; the proximal end of the outer catheter (2) is provided with a pressure valve interface (8) connected to the balloon chamber and a suction interface (9) connected to the suction chamber, and the suction interface (9) is connected to the suction device (10) through a catheter; The grinding device comprises a rotating shaft (3-1) and a grinding head (3-2) fixedly arranged at the distal end of the rotating shaft (3-1); the rotating shaft (3-1) is provided with an insulating protective sheath (3-3) on its outer cover, and the maximum outer diameter of the grinding head (3-2) is smaller than the inner diameter of the inner catheter (1); The operating device (4) comprises an operating handle (4-1) and a motor (4-2); a through hole (4-3) penetrating the front and rear and communicating with the inner conduit (1) is provided inside the operating handle (4-1); an annular boss (4-4) is also provided on the operating handle (4-1); and the motor (4-2) is electrically connected to the grinding head (3-2) and controls the rotation of the grinding head (3-2).

2. The intraluminal opening device for vascular occlusive lesions according to claim 1, characterized in that: The mesh protective sleeve (7) is in a funnel shape in an expanded state, and the outer diameter of the front end of the mesh protective sleeve (7) after expansion is the same as the outer diameter of the balloon (6) after expansion.

3. The intraluminal opening device for vascular occlusive lesions according to claim 1, characterized in that: The motor (4-2) is provided with a foot switch (4-5).

4. The intraluminal opening device for vascular occlusive lesions according to claim 1, characterized in that: The front end of the grinding head (3-2) is chamfered in an arc shape.

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