A vascular stent grasping device

Abstract

The utility model relates to the technical field of medical devices, and discloses a vascular stent grasping device, including an outer sheath, an inner sheath, an outer catheter and a guide wire, the outer surface of the distal end of the inner sheath is fixedly connected with a plurality of elastic metal wires, the outer surface of the elastic rope is fixedly connected with an umbrella-shaped net, an expansion balloon is arranged inside the inner sheath, the left and right outer surfaces of the inner sheath are located outside the expansion balloon and are fixedly connected with a first protrusion, the left and right outer surfaces of the inner sheath are located outside the elastic metal wire and are fixedly connected with a second protrusion, and the left and right inner surfaces of the outer sheath are fixedly connected with abutment blocks. In the vascular stent grasping device, the umbrella-shaped net expands in the blood vessel, cooperates with the expansion balloon, and then drives the umbrella-shaped net to be pulled out of the patient's body, and finally completes the grasping and fishing work of the intravascular stent, so that the residual stent can be grasped more stably without causing damage to the blood vessel.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a vascular stent grasping device. Background Art

[0002] Vascular stents are intelligent medical devices that, based on the formation of luminal balloon dilatation, insert internal stents into the diseased segment to support the narrowed and occluded segment of the blood vessel, reduce the elastic retraction and reshaping of the blood vessel, and maintain smooth blood flow in the lumen. Among them, some internal stents also have the function of preventing restenosis, and are mainly divided into coronary stents, cerebrovascular stents, renal artery stents, and aortic stents.

[0003] At present, during intravascular operations, when using stents in intravascular surgery, the stent may be left inside the blood vessel due to operational problems, causing vascular embolism or secondary thrombosis, threatening physical health and affecting treatment effects. Existing intravascular foreign body graspers are mostly made of stainless steel, which is a relatively hard material, resulting in poor operational control and easy damage to the blood vessel at the grasping location. Therefore, a vascular stent grasping device is proposed. Utility Model Content

[0004] In view of the deficiencies of the prior art, the utility model provides a vascular stent grasping device to solve the problems mentioned in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a vascular stent grasping device, comprising an outer sheath, an inner sheath, an outer catheter and a finger guide wire, the outer sheath is sleeved on the outside of the inner sheath, the outer surface of the distal end of the inner sheath is fixedly connected with a plurality of elastic metal wires, the outer surfaces of the plurality of elastic metal wires are fixedly connected with elastic ropes, the elastic ropes are annular, the outer surfaces of the elastic ropes are fixedly connected with umbrella-shaped nets, an expansion balloon is arranged inside the inner sheath, the left and right outer surfaces of the inner sheath are located outside the expansion balloon and are fixedly connected with a first protrusion, the left and right outer surfaces of the inner sheath are located outside the elastic metal wires and are fixedly connected with a second protrusion, and the left and right inner surfaces of the outer sheath are fixedly connected with abutment blocks.

[0006] Furthermore, the proximal outer surface of the expansion balloon is fixedly connected to an inflation tube, and the inflation tube extends to the outside of the inner sheath tube.

[0007] Furthermore, the inner sheath tube and the outer sheath tube are both divided into two sections, and a plurality of elastic strips are fixedly connected between the outer surfaces of the two sections of the inner sheath tube and between the outer surfaces of the two sections of the outer sheath tube, and through grooves are formed between the plurality of elastic strips.

[0008] Furthermore, the inner sheath is sleeved on the outer surface of the finger guide wire.

[0009] Furthermore, a hemostatic valve is arranged at the proximal end of the outer catheter, and the outer sheath, inner sheath, expansion balloon and finger guide wire are all movably arranged inside the outer catheter through the hemostatic valve.

[0010] Furthermore, the umbrella-shaped net is made of elastic fiber.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] 1. The vascular stent grasping device inflates the inside of the expansion balloon to expand the expansion balloon, and the expansion balloon squeezes the stent to make it close to the inner wall of the blood vessel, and cooperates with the outer sheath to shrink the elastic metal wire and shrink the umbrella-shaped net. Then the outer sheath, inner sheath, expansion balloon and guide wire are pulled out of the patient's body together, thereby driving the umbrella-shaped net to be pulled out of the patient's body, and finally completing the grasping and fishing work of the intravascular stent, so that the residual stent can be grasped more stably without causing damage to the blood vessel. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the front view structure of the utility model;

[0014] Figure 2 This is a schematic diagram of the partial cross-sectional structure of the distal end of the utility model;

[0015] Figure 3 This is a schematic diagram of the distal end of the inner sheath tube and its related structures of the utility model;

[0016] Figure 4 It is a schematic diagram of the local structure when the utility model is in use.

[0017] In the figure: 1, outer sheath; 2, inner sheath; 3, outer catheter; 4, elastic metal wire; 5, elastic rope; 6, umbrella-shaped net; 7, expansion balloon; 8, inflation tube; 9, finger guide wire; 10, elastic strip; 11, hemostatic valve; 12, first protrusion; 13, second protrusion. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] Please refer to Figure 1-Figure 4The utility model provides a technical solution: a vascular stent grasping device, comprising an outer sheath tube 1, an inner sheath tube 2, an outer catheter 3 and a finger guide wire 9, the outer sheath tube 1 is sleeved on the outside of the inner sheath tube 2, a plurality of elastic metal wires 4 are fixedly connected to the outer surface of the distal end of the inner sheath tube 2, an elastic rope 5 is fixedly connected to the outer surface of the plurality of elastic metal wires 4, the elastic rope 5 is annular, and an umbrella-shaped net 6 is fixedly connected to the outer surface of the elastic rope 5, an expansion balloon 7 is arranged inside the inner sheath tube 2, and the outer surfaces of the left and right sides of the inner sheath tube 2 are located outside the expansion balloon 7 and are fixedly connected to the first protrusion 12, the inner sheath tube The left and right outer surfaces of 2 are located outside the elastic metal wire 4 and are fixedly connected with second protrusions 13, and the left and right inner surfaces of the outer sheath 1 are fixedly connected with abutment blocks. In this embodiment, the stenosis position and degree are first determined by angiography technology, and the device of suitable specifications and models is selected according to the recommended size. Before the finger guide wire 9 enters the distal end of the coronary blood vessel, the outer catheter 3 is first inserted into the coronary blood vessel, and then the finger guide wire 9 is extended into the distal end of the diseased coronary blood vessel, and then the inner sales tube is sleeved on the finger guide wire 9, and the gap between the elastic metal wire 4 and the umbrella-shaped net 6 is sleeved on the finger guide wire 9. The inner sheath tube 2 and the outer sheath tube 1 are made to enter the distal end of the intravascular stent, and at this time, the elastic metal wire 4 and the umbrella-shaped net 6 are moved to the distal end of the intravascular stent. When the elastic metal wire 4 and the umbrella-shaped net 6 move to the distal end of the intravascular stent, the outer sheath tube 1 is retracted outwards, so that the abutment block in the outer sheath tube 1 moves. When the abutment block moves to a position corresponding to the first protrusion 12, the through grooves on the surfaces of the outer sheath tube 1 and the inner sheath tube 2 correspond to each other. As the outer sheath tube 1 is retracted, the elastic metal wire 4 is slowly freed from the restraint of the outer sheath tube 1 and is gradually released and unfolded, which drives the elastic rope 5 until the elastic rope 5 is completely Occupies the inner diameter of the distal blood vessel, and then allows the expansion balloon 7 to enter the inner sheath 2. After the expansion balloon 7 moves to the through groove, it pushes the outer sheath 1 and the inner sheath 2, so that the expansion balloon 7 enters the vascular stent, and then the expansion balloon 7 expands, squeezes the stent in the blood vessel to make it close to the blood vessel, and then the outer sheath 1, the inner sheath 2, the expansion balloon 7 and the guiding wire 9 are pulled out of the patient's body together, thereby driving the umbrella-shaped net 6 to be pulled out of the patient's body, and finally completing the capture and fishing work of the intravascular stent, so that the residual stent can be captured more stably without causing damage to the blood vessel.

[0020] The proximal outer surface of the expansion balloon 7 is fixedly connected to an inflation tube 8, which extends to the outside of the inner sheath tube 2. In this embodiment, air is injected into the inflation tube 8 through a syringe to expand the expansion balloon 7, thereby squeezing the stent in the blood vessel to make it close to the blood vessel.

[0021] The inner sheath tube 2 and the outer sheath tube 1 are both divided into two sections, and a plurality of elastic strips 10 are fixedly connected between the outer surfaces of the two sections of the inner sheath tube 2 and the outer surfaces of the two sections of the outer sheath tube 1, and a through groove is formed between the plurality of elastic strips 10. In the present embodiment, after the expansion balloon 7 moves to the through groove, the outer sheath tube 1 and the inner sheath tube 2 are pushed, so that the expansion balloon 7 enters the vascular stent, and then the inflation tube 8 is inflated through a syringe, so that the expansion balloon 7 expands, and the elastic strip 10 undergoes corresponding deformation, and the stent in the blood vessel is squeezed from the through groove to make it close to the blood vessel.

[0022] The inner sheath 2 is sleeved on the outer surface of the finger guide wire 9. In this embodiment, after the finger guide wire 9 enters the blood vessel, the inner sheath 2 is sleeved on the finger guide wire 9, and the gap between the elastic metal wire 4 and the umbrella-shaped net 6 is sleeved on the finger guide wire 9.

[0023] A hemostatic valve 11 is provided at the proximal end of the outer catheter 3, and the outer sheath 1, the inner sheath 2, the dilatation balloon 7 and the finger guide wire 9 are all movably arranged inside the outer catheter 3 through the hemostatic valve 11. In the present embodiment, before the finger guide wire 9 enters the distal end of the coronary vessel, the outer catheter 3 is first inserted into the coronary vessel, and its distal end is connected to the blood vessel of the remaining stent, so that the outer sheath 1, the inner sheath 2, the dilatation balloon 7 and the finger guide wire 9 can smoothly enter and exit the channel of the outer catheter 3.

[0024] The material of the umbrella-shaped net 6 is elastic fiber. In this embodiment, the fiber is made of a polymer compound with stable quality, good coverage, strength and wear resistance, and the fiber has high elasticity, so that the umbrella-shaped net 6 can be contracted and expanded.

[0025] Working principle: When the utility model is used, the stenosis position and degree are first determined with the help of angiography technology, and the device of suitable specifications and models is selected according to the recommended size. Before the finger guide wire 9 enters the distal end of the coronary blood vessel, the outer catheter 3 is first inserted into the coronary blood vessel, and then the finger guide wire 9 is extended into the distal end of the diseased coronary blood vessel, and then the inner pin is sleeved on the finger guide wire 9, and the gap between the elastic metal wire 4 and the umbrella-shaped net 6 is sleeved on the finger guide wire 9, so that the inner sheath tube 2 and the outer sheath tube 1 enter the distal end of the intravascular stent. At this time, the elastic metal wire 4 and the umbrella-shaped net 6 are moved to the distal end of the intravascular stent. When the elastic metal wire 4 and the umbrella-shaped net 6 move to the distal end of the intravascular stent, the outer sheath tube 1 is retracted outwards, so that the abutment block in the outer sheath tube 1 moves. When the abutment block moves to the position corresponding to the first protrusion 12, the through grooves on the surfaces of the outer sheath tube 1 and the inner sheath tube 2 correspond to each other. As the outer sheath The retraction of tube 1 causes the elastic metal wire 4 to be slowly freed from the restraint of the outer sheath tube 1 and gradually released and unfolded, which drives the elastic rope 5 until the elastic rope 5 completely occupies the inner diameter of the distal blood vessel, and then causes the expansion balloon 7 to enter the inner sheath tube 2. After the expansion balloon 7 moves to the through groove, it pushes the outer sheath tube 1 and the inner sheath tube 2, so that the expansion balloon 7 enters the blood vessel stent, and then the inflation tube 8 is inflated with air through a syringe, so that the expansion balloon 7 expands to a certain extent, and causes the elastic strip 10 to undergo corresponding deformation, and squeezes the stent in the blood vessel from the through groove to make it close to the inner wall of the blood vessel, and then the outer sheath tube 1, the inner sheath tube 2, the expansion balloon 7 and the guiding wire 9 are pulled out of the patient's body together, thereby driving the umbrella-shaped net 6 to pull the intravascular stent out of the patient's body, and finally completing the capture and fishing work of the intravascular stent, so that the residual stent can be captured more stably without causing damage to the blood vessel.

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A vascular stent grasping device, comprising an outer sheath (1), an inner sheath (2), an outer catheter (3) and a finger guide wire (9), characterized in that: The outer sheath tube (1) is sleeved on the outside of the inner sheath tube (2); the outer surface of the distal end of the inner sheath tube (2) is fixedly connected to a plurality of elastic metal wires (4); the outer surfaces of the plurality of elastic metal wires (4) are fixedly connected to elastic ropes (5); the elastic ropes (5) are ring-shaped; the outer surfaces of the elastic ropes (5) are fixedly connected to an umbrella-shaped net (6); an expansion balloon (7) is arranged inside the inner sheath tube (2); the outer surfaces of the left and right sides of the inner sheath tube (2) are located outside the expansion balloon (7) and are fixedly connected to a first protrusion (12); the outer surfaces of the left and right sides of the inner sheath tube (2) are located outside the elastic metal wires (4) and are fixedly connected to a second protrusion (13); and the inner surfaces of the left and right sides of the outer sheath tube (1) are fixedly connected to abutment blocks.

2. A vascular stent grasping device according to claim 1, characterized in that: The proximal outer surface of the expansion balloon (7) is fixedly connected to an inflation tube (8), and the inflation tube (8) extends to the outside of the inner sheath tube (2).

3. A vascular stent grasping device according to claim 1, characterized in that: The inner sheath tube (2) and the outer sheath tube (1) are both divided into two sections, and a plurality of elastic strips (10) are fixedly connected between the outer surfaces of the two sections of the inner sheath tube (2) and between the outer surfaces of the two sections of the outer sheath tube (1), and through grooves are formed between the plurality of elastic strips (10).

4. A vascular stent grasping device according to claim 1, characterized in that: The inner sheath tube (2) is sleeved on the outer surface of the finger guide wire (9).

5. The vascular stent grasping device according to claim 1, characterized in that: The proximal end of the outer catheter (3) is provided with a hemostatic valve (11), and the outer sheath (1), the inner sheath (2), the dilatation balloon (7) and the finger guide wire (9) are all movably arranged inside the outer catheter (3) through the hemostatic valve (11).

6. A vascular stent grasping device according to claim 1, characterized in that: The material of the umbrella-shaped net (6) is elastic fiber.

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