CN115349916A - A netted thrombectomy device that is used for lower limbs artery to thrombectomy - Google Patents

Abstract

The application discloses a reticular thrombus removal device for removing thrombus from lower limb artery, which is characterized by comprising a protective umbrella component, a thrombus removal component, a conveying catheter and a thrombus receiving catheter; the protective umbrella assembly comprises a reticular protective umbrella and a first guide wire connected with the reticular protective umbrella; the thrombus taking assembly comprises a thrombus taking device and a second guide wire connected with the thrombus taking device, and the thrombus taking device is a conical metal net; a round hole for the first guide wire to pass through is arranged at the side of the embolectomy device; the conveying catheter is used for accommodating or releasing the protective umbrella assembly and the thrombus taking assembly, and the thrombus accommodating catheter is sleeved outside the conveying catheter and used for accommodating thrombus taken by the thrombus taking assembly. The thrombus receiving catheter is conveyed to the proximal end of the embolism section, and after the conveying catheter conveys the reticular protective umbrella and the thrombus taking device to the embolism section, the second guide wire connected with the thrombus taking device is withdrawn, and the thrombus is pulled back into the thrombus receiving catheter. The application can be used for lower limb arterial embolism patients who cannot apply the conventional treatment method or have poor curative effect after applying the conventional treatment method, and can improve the prognosis of the patients and improve the limb protection rate.

Description

A netted thrombectomy device for lower limbs artery thrombectomy

Technical Field

The application relates to a reticular thrombus removal device for removing thrombus from lower limb artery, and relates to the technical field of medical instruments.

Background

Arterial embolism refers to thrombus or atheromatous plaque attached to the inner or proximal arterial wall of a heart chamber, which is washed to the distal end of an artery by blood flow, so that the lumen of the distal artery is embolized, and acute ischemia occurs to distal organs, limbs and tissues supplied by the artery. Of all peripheral arteries, the lower limb artery is the most common site for embolization. Traditional methods of treatment of arterial embolism in the lower extremities include the following: (1) cutting a Fogarty catheter to remove the thrombus from the lower limb artery; (2) eliminating thrombus in the cavity. The disadvantages of these two conventional approaches include:

1. cutting a Fogarty catheter to remove thrombus from the lower limb artery: firstly, the thrombus-taking device can only be used for the thrombus part positioned in main and lower limb arteries (iliac artery, femoral artery and popliteal artery), when the thrombus is positioned in three branch arteries below knee, the thrombus-taking catheter cannot be accurately controlled to enter a certain specific artery to be taken out, and therefore the thrombus cannot be completely taken out; second, arteriotomy often requires the patient to receive general anesthesia, which is difficult to perform for some patients with poor foundation conditions who cannot tolerate general anesthesia, and open surgery is more traumatic for the patient; finally, this method is not effective if the patient is simultaneously associated with lower extremity arteriosclerotic diseases.

2. Clearing thrombus in the cavity: although this method is less traumatic than the incision and embolectomy, the thrombectomy device mostly removes the thrombi by physical rotary cutting/scouring, in order to avoid/reduce the damage to the artery wall, the action range of the thrombectomy device is often a certain distance away from the artery wall, thereby resulting in incomplete thrombi removal and even causing new distal embolism participating in the displacement of the embolus; second, the effectiveness of the thrombectomy device is often less than optimal for the head of the thrombus (i.e., white thrombus).

Because the lower limb arterial embolism is acute ischemia, the ischemia degree of the affected limb is heavy, the progression is fast, and the prognosis is poor. Therefore, if the curative effect is poor, the amputation and even death of the patient are often caused.

Disclosure of Invention

The application aims to provide a thrombus extraction device which can extract thrombus in a lower limb artery through a minimally invasive method, and avoid unrelieved ischemia or new distal artery embolism caused by incomplete thrombus extraction.

In order to solve the technical problem, the technical scheme of the application provides a reticular thrombus removal device for removing thrombus from lower limb artery, which is characterized by comprising a protective umbrella component, a thrombus removal component, a conveying catheter and a thrombus receiving catheter; the protective umbrella assembly comprises a reticular protective umbrella and a first guide wire connected with the reticular protective umbrella; the thrombus taking assembly comprises a thrombus taking device and a second guide wire connected with the thrombus taking device, and the thrombus taking device is a conical metal net; a round hole for a first guide wire to pass through is formed in the side of the embolectomy device; the conveying catheter is used for accommodating or releasing the protective umbrella assembly and the thrombus taking assembly, and the thrombus accommodating catheter is sleeved outside the conveying catheter and used for accommodating a thrombus taken by the thrombus taking assembly.

Preferably, the front section of the first guide wire is a soft section, the rear section of the first guide wire is a rigid section, and the reticular protective umbrella is fixedly arranged at the position, close to the soft section, of the rigid section.

Preferably, the edge of the reticular protective umbrella is provided with a plurality of metal wires connected with the first guide wire.

Preferably, the diameter of the mesh near the tip end of the tapered metal net is smaller than that near the open end, and the diameter of the mesh gradually increases from the tip end to the open end.

Preferably, the round holes are provided with two ends which are respectively positioned at the tip end and the opening end of the embolectomy device.

Preferably, the diameters of the first guide wire and the second guide wire are 0.014inch; the inner diameter of the conveying conduit is 0.035inch; the nanocatheter outer diameter 7F.

The application can be used for patients with lower limb arterial embolism, which can not apply conventional treatment methods or has poor curative effect after applying the conventional treatment methods, and has the advantages of improving the prognosis of the patients and improving the limb protection rate. The application fills in the blank of the thrombus removal device in the field of lower limb artery, does not need general anesthesia during operation, and provides a new choice for patients who cannot use the traditional method or have poor curative effect after using the traditional method.

Drawings

FIG. 1 is a schematic view of the protective umbrella assembly provided in the embodiments;

FIG. 2 is a schematic structural view of a thrombectomy assembly and a delivery catheter provided in the embodiment;

fig. 3 is a schematic structural diagram of a thrombus-receiving catheter provided in the embodiment.

Detailed Description

In order to make the present application more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.

Examples

The embodiment provides a reticular thrombus removal device for removing thrombus from lower limb artery, which comprises: the device comprises a protective umbrella component 1, a bolt taking component 2, a conveying conduit 3 and a bolt receiving conduit 4;

referring to fig. 1, the protective umbrella assembly 1 comprises a first guide wire 11 and a mesh protective umbrella 12, the first guide wire 11 is made of nickel-titanium alloy and can be developed in the whole process under X-ray, the model is 0.014inch, the front section of the first guide wire 11 is set to be a soft section 11-1 (2 cm), the tail section of the first guide wire 11 is set to be a rigid section 11-2 (258 cm), the total length is 260cm, the mesh protective umbrella 12 is fixed at the position of the rigid section 11-2 close to the soft section 11-1 (12 cm away from the head end of the front section of the first guide wire 11), three metal wires are connected between the edge of the mesh protective umbrella 12 and the first guide wire 11, the mesh protective umbrella 12 is conveniently driven to shrink when the mesh protective umbrella 12 is recovered, and the mesh diameter of the mesh protective umbrella 12 is between 80 and 210 μm;

referring to fig. 2, the embolectomy component 2 comprises a second guide wire 21 and an embolectomy device 22, the embolectomy device 22 is a conical metal net arranged at the front end of the second guide wire 21 and is made of nickel-titanium alloy, the diameter of a mesh hole of the conical metal net close to the tip is small, the diameter of a mesh hole close to the open end is large, namely the diameter of the mesh hole is gradually increased from the tip to the open end, the mesh hole is circular, has self-expansion performance based on metal elasticity, and is quickly released, the open end of the conical metal net can be expanded to the maximum diameter and is slowly released, the mesh hole to be released is gradually released after being relatively shaped, and the diameter of the open end of the conical metal net can be adjusted; the second guide wire 21 is connected with the embolectomy device 22 and is used for withdrawing the embolectomy device 22; a round hole 22-1 for the first guide wire 11 to pass through is arranged at the side of the embolectomy device 22, and specifically, the round hole 22-1 can be respectively arranged at the tip end and the opening end of the embolectomy device 22;

the conveying conduit 3 is used for accommodating and releasing the protective umbrella assembly 1 and the bolt taking assembly 2, after the protective umbrella assembly 1 and the bolt taking assembly 2 are conveyed to the embolism section, the protective umbrella assembly 1 and the bolt taking assembly 2 can be released by retracting the conveying conduit 3, and the caliber of the opening end of the bolt taking device 22 can be adjusted through the retracting range; specifically, the inner diameter of the conveying conduit 3 is 0.035inch, and the head end is provided with a developing section 31 which can be developed under X-ray for observing the conveying position;

referring to fig. 3, the thrombus-receiving catheter 4 contains the delivery catheter 3, the protection umbrella assembly 1 and the thrombus-taking assembly 2, and after the delivery catheter 3 is withdrawn, the thrombus taken by the thrombus-taking assembly 2 is contained, specifically, the outer diameter 7F of the thrombus-receiving catheter 4.

When the patient is used, taking a left lower limb arterial embolism patient as an example, the patient is placed in an operating room and then takes a supine position, after a disinfection and tissue spreading, the patient punctures the right femoral artery and turns the mountain to the left side, and the left popliteal artery embolism shadow can be seen through radiography. And (3) placing a 7F turning sheath from the right puncture point to the left femoral artery, and conveying the embolism containing catheter 4 to the proximal end of the embolism section. The tail end of a first guide wire 11 connected with a reticular protective umbrella 12 penetrates through a round hole 22-1 at the side of a thrombus taking device 22, the protective umbrella component 1 and the thrombus taking component 2 are sent into a 0.035inch conveying catheter 3 together, the front section soft section 11-1 of the first guide wire 11 is used for rotating to select the direction, after the distal end of the popliteal artery is selected, the conveying catheter 3 is matched with the first guide wire 11 to advance step by step, after the reticular protective umbrella 12 and the thrombus taking device 22 are confirmed to pass through a thrombus section under direct X-ray vision, the conveying catheter 3 is withdrawn, and at the moment, the reticular protective umbrella 12 and the thrombus taking device 22 are both expanded under the X-ray vision. The second guidewire 21, now attached to the embolectomy device 22, may be withdrawn, drawing the thrombus back into the embolectomy catheter 4.

The remaining thrombus can be identified by imaging again, and if there is any remaining thrombus, the thrombus remover 22 can be accommodated in the 0.035inch delivery catheter 3 again to repeat the above steps. When no obvious thrombus residue is observed or only the residual thrombus in the reticular protective umbrella is observed in the radiography, the 0.014inch first guide wire 11 connected with the reticular protective umbrella 12 is withdrawn and enters the thrombus containing catheter 4. Finally, after imaging, the operation is finished without residual thrombus.

Claims (6)

1. A reticular thrombus removal device for removing thrombus from lower limb artery is characterized by comprising a protective umbrella component (1), a thrombus removal component (2), a conveying catheter (3) and a thrombus receiving catheter (4); the protective umbrella assembly (1) comprises a reticular protective umbrella (12) and a first guide wire (11) connected with the reticular protective umbrella (12); the thrombus removal assembly (2) comprises a thrombus removal device (22) and a second guide wire (21) connected with the thrombus removal device (22), and the thrombus removal device (22) is a conical metal net; a round hole (22-1) for a first guide wire (11) to pass through is arranged at the side of the embolectomy device (22); the conveying catheter (3) is used for accommodating or releasing the protective umbrella assembly (1) and the thrombus taking assembly (2), and the thrombus taking catheter (4) is sleeved outside the conveying catheter (3) and used for accommodating thrombus taken by the thrombus taking assembly (2).

2. The mesh-type embolectomy device for lower limb artery embolectomy according to claim 1, wherein the front section of the first guide wire (11) is a soft section, the rear section of the first guide wire is a rigid section, and the mesh-type protective umbrella (12) is fixedly arranged at a position, close to the soft section (11-1), of the rigid section (11-2).

3. The reticulated plug removal device for removing a plug from an artery of a lower limb of claim 2, wherein the reticulated umbrella (12) is provided at the edge thereof with a plurality of wires connected to the first guide wire (11).

4. The mesh-type embolectomy device of claim 1, wherein the diameter of the mesh near the tip of the tapered metal mesh is smaller than the diameter of the mesh near the open end, and the diameter of the mesh gradually increases from the tip to the open end.

5. The mesh-like embolectomy device for lower extremity arterial embolectomy of claim 4, wherein the circular hole (22-1) is provided with two, respectively at the tip and the open end of the embolectomy device (22).

6. The mesh-type embolectomy device for lower limb arterial embolectomy of claim 1, wherein the diameter of the first guide wire (11) and the diameter of the second guide wire (21) are 0.014inch; the inner diameter of the conveying conduit (3) is 0.035inch; the outer diameter 7F of the suppository containing conduit (4).

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