Intravascular scissor kit

Abstract

An endovascular scissor kit includes a scissor device; the scissor device includes a base, a sliding sleeve, a sheath, a first steel wire, and a scissor assembly; the sliding sleeve is slidably mounted on the sliding section of the base; the rear end of the sheath is fixedly connected to the sheath connecting section of the base, and the sheath has a first channel inside; the first steel wire is slidably installed in the first channel, its rear end extending outside the sheath and fixedly connected to the sliding sleeve, and its front end extending outside the sheath and connected to the scissor assembly; the first steel wire moves along the first channel of the sheath under the drive of the sliding sleeve, thereby driving the scissor assembly to open and close. This invention can cut and remove the end wire of an embolized coil extending into the normal vascular lumen during minimally invasive / interventional surgery, and is suitable for handling the above-mentioned situation during or after the implantation of an embolized coil.

Description

Technical Field

[0001] This utility model relates to interventional surgical medical devices, and in particular to an intravascular scissor kit. Background Technology

[0002] Embolization coils are embolization devices made of materials such as metal alloys or synthetic fibers. They are mainly used to fill the aneurysm cavity. They are loaded into a microcatheter and implanted into the blood vessel through interventional surgery. They gradually expand and fill the aneurysm cavity, promoting thrombus formation, thereby blocking blood flow within the aneurysm and reducing the risk of aneurysm rupture.

[0003] However, during or shortly after the implantation of embolization coils, the embolization coils may shift, causing the flexible filaments of the embolization coils to extend into the normal blood vessel lumen. The extended flexible filaments can induce thrombosis and affect the blood flow within the blood vessel.

[0004] The most direct solution to the above problem is to cut the flexible filaments inside the normal blood vessel lumen and pull them out of the body, but there are currently no corresponding surgical instruments to achieve the above functional requirements. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide an endovascular scissor kit that can cut and remove the end wires of embolization coils that extend into the normal blood vessel lumen during minimally invasive / interventional surgery. It is suitable for handling the above-mentioned situation during or after the implantation of embolization coils.

[0006] The technical solution of this utility model is: an intravascular scissor kit, including a scissor device; The scissor device includes a base, a sliding sleeve, a sheath, a first steel wire, and a scissor assembly. The base is a strip-shaped component with a sliding sleeve sliding section at its rear end and a sheath connecting section at its front end. The sliding sleeve is fitted onto the sliding sleeve sliding section of the base and moves linearly back and forth only along the sliding sleeve sliding section of the base. The rear end of the sheath is fixedly connected to the sheath connecting section of the base, and the front end of the sheath is a free end. The sheath has a first channel running through its front and rear ends. The first steel wire is slidably installed in the first channel of the sheath, with its rear end extending out of the sheath and fixedly connected to the sliding sleeve, and its front end extending out of the sheath and connected to the scissor assembly. Driven by the sliding sleeve, the first steel wire moves along the first channel of the sheath, thereby driving the scissor assembly to open and close.

[0007] A further technical solution of this utility model is: the sheath tube is provided with a second channel that penetrates its front end face and rear end side wall; The intravascular scissor kit also includes a capture device; The capturing device consists of a second steel wire and a collar fixedly connected to the front end of the second steel wire; the second steel wire is movably installed in the second channel of the sheath tube, and its rear end extends out of the sheath tube; when the collar is in the second channel of the sheath tube, it is constrained by the second channel of the sheath tube and deforms; when the collar extends out of the sheath tube, it recovers under its own elasticity.

[0008] A further technical solution of this utility model is: a side tube is installed at the second channel entrance of the sheath at the rear side wall, the front end of the side tube is connected to the second channel entrance of the rear side wall of the sheath, the rear end of the side tube is a free end and is provided with a flared mouth, and the inner hole of the side tube is connected to the second channel of the sheath; the front end of the capturing device enters the second channel of the sheath in sequence through the flared mouth of the side tube and the inner hole of the side tube.

[0009] A further technical solution of this utility model is as follows: the base is provided with two parallel guide columns in the sliding section of the sliding sleeve, and a hollow area is provided between the two guide columns; correspondingly, the sliding sleeve is provided with guide holes that penetrate its two end faces and cooperate with the guide columns, and the sliding sleeve is slidably installed on the two guide columns through the two guide holes; the rear end of the sheath extends into the hollow area; the rear end of the first steel wire is located in the hollow area and is fixedly connected to the end face of the sliding sleeve.

[0010] A further technical solution of this utility model is as follows: the scissor assembly includes a bearing, a rhomboid deformable frame, and shearing arms; two bearings are arranged opposite to each other and fixedly connected to the front end face of the sheath tube, and an installation area is provided between the two bearings; the rhomboid deformable frame is provided with hinge points A and B arranged opposite to each other, the entire rhomboid deformable frame is located in the installation area between the two bearings, hinge point A of the rhomboid deformable frame is hinged to the front end of the first steel wire extending into the installation area, and hinge point B of the rhomboid deformable frame is hinged to the end of the two bearings that is relatively far away from the sheath tube; two shearing arms are arranged in a cross shape and are respectively connected to hinge point B of the rhomboid deformable frame, each of the two shearing arms is provided with a blade on one side, the blades of the two shearing arms are arranged opposite to each other, and the two shearing arms open or close as the rhomboid deformable frame deforms.

[0011] A further technical solution of this utility model is: the two ends of the blade are straight lines, and the middle part is a concave arc; when the two shearing arms are closed, the two concave arcs face each other and close.

[0012] Compared with the prior art, this utility model has the following advantages: it can cut and remove the end wire of the embolization coil that extends into the normal blood vessel lumen under minimally invasive / interventional surgery, and is suitable for handling the above-mentioned situation during or after the implantation of embolization coils.

[0013] The present invention will be further described below with reference to the figures and embodiments. Attached Figure Description

[0014] Figure 1This is a schematic diagram of the structure of the present invention when the scissor assembly is open; Figure 2 This is a schematic diagram of the closed-type structure of the scissor assembly of this utility model; Figure 3 for Figure 1 Enlarged view of Part I; Figure 4 for Figure 2 Enlarged view of Part II; Figure 5 for Figure 3 AA section view; Figure 6 for Figure 1 BB section view; Figure 7 for Figure 4 CC section view; Figure 8 This is a state diagram when step 1 of the training method is completed; Figure 9 This is a state diagram showing the state when step 2 of the training method is completed; Figure 10 This is a state diagram when step 3 of the training method is completed; Figure 11 This is a state diagram showing the state when step 4 of the training method is completed. Figure 12 This is a state diagram showing the state when step 5 of the training method is completed. Figure 13 This is a state diagram for step 6 of the training method.

[0015] Legend: Base 11; Sliding section of the sliding sleeve 111; Sheath connecting section 112; Guide post 113; Hollowed-out area 114; Sliding sleeve 12; Sheath 13; First channel 131; Second channel 132; Side tube 133; Trumpet mouth 1331; First steel wire 14; Scissor assembly 15; Shaft seat 151; Rhomboid deformable frame 152; Hinge point A 1521; Hinge point B 1522; Shear arm 153; Concave arc 1531; Capturing device 2; Second steel wire 21; Loop 22; Guide wire 3; Aortic aneurysm 4; End wire 5. Detailed Implementation Example 1

[0016] like Figure 1-7 As shown, the intravascular scissor kit includes a scissor device and a capture device 2.

[0017] The scissor device includes a base 11, a sliding sleeve 12, a sheath 13, a first steel wire 14, and a scissor assembly 15. The base 11 is a strip-shaped component with a sliding sleeve sliding section 111 at its rear end and a sheath connecting section 112 at its front end. The sliding sleeve 12 is slidably fitted onto the sliding sleeve sliding section 111 of the base 11, and moves linearly back and forth only on the sliding sleeve sliding section 111 of the base 11. The rear end of the sheath 13 is fixedly connected to the sheath connecting section 112 of the base 11, and the front end of the sheath 13 is a free end. The sheath 13 has a first channel 131 running through both its front and rear ends. The sheath 13 also has a second channel 132 running through its front end face and rear end sidewall, with an outlet and an inlet on the front end face and rear end sidewall of the sheath 13, respectively. The first steel wire 14 is slidably installed inside the first channel 131 of the sheath tube 13, with its rear end extending outside the sheath tube 13 and fixedly connected to the sliding sleeve 12, and its front end extending outside the sheath tube 13 and connected to the scissor assembly. Driven by the sliding sleeve 12, the first steel wire 14 moves along the first channel 131 (inside) of the sheath tube 13, thereby driving the scissor assembly to open and close.

[0018] The capturing device 2 consists of a second steel wire 21 and a collar 22 fixedly connected to the front end of the second steel wire 21. Both the second steel wire 21 and the collar 22 are made of flexible and elastic material. The second steel wire 21 is movably installed in the second channel 132 of the sheath tube 13, with its rear end extending outside the sheath tube 13. When the collar 22 is inside the second channel 132 of the sheath tube 13, it is constrained by the second channel 132 of the sheath tube 13 and becomes strip-shaped. When the collar 22 extends outside the sheath tube 13, it expands and returns to an elliptical shape under its own elasticity.

[0019] Preferably, the sheath 13 is made of a flexible and bendable material.

[0020] Preferably, a side tube 133 is installed at the inlet of the second channel 132 on the rear side wall of the sheath 13. The front end of the side tube 133 is connected to the inlet of the second channel 132 on the rear side wall of the sheath 13. The rear end of the side tube 133 is a free end and has a flared end 1331. The inner hole of the side tube 133 communicates with the second channel 132 of the sheath 13. The front end (the collar 22) of the capturing device 2 enters the second channel 132 of the sheath 13 sequentially through the flared end 1331 and the inner hole of the side tube 133. The side tube 133 and the flared end 1331 are designed to facilitate the insertion of the capturing device 2 into the second channel 132 of the sheath 13.

[0021] Preferably, the base 11 has two parallel guide posts 113 in the sliding section 111 of the sliding sleeve, and a hollow area 114 is provided between the two guide posts 113. Correspondingly, the sliding sleeve 12 has guide holes that penetrate its two end faces and cooperate with the guide posts 113. The sliding sleeve 12 is slidably mounted on the two guide posts 113 through the two guide holes. The rear end of the sheath tube 13 extends into the hollow area 114. The rear end of the first steel wire 14 is located in the hollow area 114 and is fixedly connected to the end face of the sliding sleeve 12. This specifically defines the sliding fit structure between the sliding sleeve 12 and the base 11. Based on this structure, the sliding sleeve 12 can only reciprocate linearly within a fixed section on the base 11 and cannot rotate relative to the base 11, thus meeting the corresponding functional requirements.

[0022] Preferably, the shear assembly 15 includes a bearing 151, a rhomboid deformable frame 152, and a shear arm 153. The two bearings 151 are arranged opposite to each other and fixedly connected to the front end face of the sheath tube 13, and an installation area is provided between the two bearings 151. The rhomboid deformable frame 152 is provided with hinge points A1521 and B1522 arranged opposite to each other. The entire rhomboid deformable frame 152 is located in the installation area between the two bearing seats 151. Hinge point A1521 of the rhomboid deformable frame 152 is hinged to the front end of the first steel wire 14 extending into the installation area. Hinge point B1522 of the rhomboid deformable frame 152 is hinged to the end of the two bearing seats 151 that is relatively far away from the sheath tube 13. Two shear arms 153 are arranged in a cross shape and are respectively connected to hinge point B1522 of the rhomboid deformable frame 152. Each of the two shear arms 153 is provided with a blade on one side. The blades of the two shear arms 153 are arranged opposite to each other. The two shear arms 153 open or close as the rhomboid deformable frame 153 deforms. This section specifically defines the connection structure between the scissor assembly 15 and the first steel wire 14. Based on this structure, when the first steel wire 14 moves telescopically in the first channel 131 of the base 11, the front end of the first steel wire 14 pulls the rhomboid deformable frame 152 to deform, thereby causing the two shearing arms 153 to open or close.

[0023] Preferably, the two ends of the blade are straight lines, and the middle part is a concave arc 1531. When the two shearing arms 153 are closed, the concave arcs 1531 on the two shearing arms 153 face each other and close. Based on this structure, the positioning and anti-slip of the target being sheared are achieved, effectively preventing the target being sheared from sliding out of the shearing area (i.e., the V-shaped area formed when the two shearing arms 153 are open) when the two shearing arms 153 are closed.

[0024] A training method for cutting and removing flexible filaments from embolized coils is based on the aforementioned endovascular scissor kit. The training object is a simulated human body model. The simulated human body model is made of repairable material, with simulated skin on the outside and a thoracic cavity and an abdominal cavity inside. The thoracic cavity and abdominal cavity contain corresponding organs and simulated blood vessels, respectively. The simulated blood vessels are filled with a colored liquid and have the property of being visualized under DSA. The simulated blood vessels include the thoracic aorta and the abdominal aorta. A simulated aortic aneurysm is located on the thoracic aorta or the abdominal aorta. The aortic aneurysm is filled with embolized coils and a curing colloid. The curing colloid is used to simulate a coagulated thrombus. The embolized coil is embedded in the curing colloid, with only one end filament exposed and extending into the thoracic aorta or the abdominal aorta.

[0025] like Figure 8-13 As shown, the training method is as follows: 1. Puncture the femoral artery and insert guidewire 3. Push guidewire 3 deep into the blood vessel until the tip of guidewire 3 reaches the aortic aneurysm 4 and the rear end of guidewire 3 extends outside the human model. Pass the outlet of the second channel 132 of sheath 13 (located on the front end face of sheath 13) through the rear end of guidewire 3. Push sheath 13 deep into the blood vessel along the path defined by guidewire 3 until the tip of sheath 13 reaches 1-4 cm from the distal end of aortic aneurysm 4 and the rear end of sheath 13 and base 11 both extend outside the human model.

[0026] 2. Pull the guide wire 3 out from the second channel 132 of the sheath tube 13, then insert the collar 22 of the capture device 2 into the flared mouth 1331 of the side tube 133 and push it forward. The collar 22 of the capture device 2 passes through the inner hole of the side tube 133, the inlet of the second channel 132 (located on the rear side wall of the sheath tube 13), the second channel 132 and the outlet of the second channel 132 in sequence, and extends to the outside of the front end of the sheath tube 13. The rear end of the capture device 2 extends out of the human body model.

[0027] 3. Continue to push the capture device 2, and adjust the posture and position of the collar 22 by rotating the second steel wire 21 and / or the base 11, so that the collar 22 covers the end wire 5 of the plug spring coil.

[0028] 4. Perform three operations simultaneously: I. Push the sheath 13 again to move the scissor assembly 15 toward the end filament 5; II. Move the sliding sleeve 12 to slide on the sliding section 111 of the base 11, thereby pushing the first steel wire 14 toward the scissor assembly 15. The first steel wire 14 drives the rhomboid deformation frame 152 to deform, thereby causing the two shear arms 153 to change from closed to open; III. Ensure that the end filament 5 does not come out of the collar 22, rotate the base 11 to adjust the scissor assembly to a suitable shearing angle. The length of the remaining end filament 5 is different under different shearing angles. Specifically, the length of the remaining end filament 5 after the shearing operation should be within 2mm.

[0029] 5. Move the sliding sleeve 12 on the sliding section 111 of the base 11. The first steel wire 14 drives the rhomboid deformation frame 152 to deform, which in turn drives the two shear arms 153 to change from open to closed, thereby cutting the end wire 5 located between the two concave arcs 1531 of the two shear arms 153.

[0030] 6. Pull the capture device 2 out of the human body model. The collar 22 of the capture device 2 carries the cut end filament 5, which enters the second channel 132 through the outlet of the second channel 132, and then passes through the inlet of the second channel 132, the inner hole of the side tube 133 and the flared mouth 1331 of the side tube 133 in sequence, and is discharged to the outside of the human body model.

[0031] 7. Remove the sheath 13 and close the wound.

Claims

1. A kit for an intraluminal vascular scissors, characterized by: Includes scissor-like devices; The scissor device includes a base, a sliding sleeve, a sheath, a first steel wire, and a scissor assembly. The base is a strip-shaped component with a sliding sleeve sliding section at its rear end and a sheath connecting section at its front end. The sliding sleeve is fitted onto the sliding sleeve sliding section of the base and moves linearly back and forth only along the sliding sleeve sliding section of the base. The rear end of the sheath is fixedly connected to the sheath connecting section of the base, and the front end of the sheath is a free end. The sheath has a first channel running through its front and rear ends. The first steel wire is slidably installed in the first channel of the sheath, with its rear end extending out of the sheath and fixedly connected to the sliding sleeve, and its front end extending out of the sheath and connected to the scissor assembly. Driven by the sliding sleeve, the first steel wire moves along the first channel of the sheath, thereby driving the scissor assembly to open and close.

2. The vascular endosseal scissors kit of claim 1 wherein: The sheath has a second channel inside that runs through its front end face and rear end sidewall; The intravascular scissor kit also includes a capture device; The capturing device consists of a second steel wire and a collar fixedly connected to the front end of the second steel wire; the second steel wire is movably installed in the second channel of the sheath tube, and its rear end extends out of the sheath tube; when the collar is in the second channel of the sheath tube, it is constrained by the second channel of the sheath tube and deforms; when the collar extends out of the sheath tube, it recovers under its own elasticity.

3. The vascular endosseal scissors kit of claim 2 wherein: A side tube is installed at the second channel entrance on the rear side wall of the sheath. The front end of the side tube is connected to the second channel entrance on the rear side wall of the sheath. The rear end of the side tube is a free end and is provided with a flared mouth. The inner hole of the side tube is connected to the second channel of the sheath. The front end of the capturing device enters the second channel of the sheath in sequence through the flared mouth of the side tube and the inner hole of the side tube.

4. The vascular endosseal scissors kit of claim 3 wherein: The base has two parallel guide posts in the sliding section of the sleeve, and a hollow area is provided between the two guide posts; correspondingly, the sleeve has guide holes that pass through its two end faces and cooperate with the guide posts. The sleeve is slidably installed on the two guide posts through the two guide holes; the rear end of the sheath extends into the hollow area; the rear end of the first steel wire is located in the hollow area and is fixedly connected to the end face of the sleeve.

5. The vascular endosseal scissors kit of claim 4 wherein: The scissor assembly includes a bearing, a rhomboid deformable frame, and shear arms. Two bearings are arranged opposite each other and fixedly connected to the front end face of the sheath tube, with an installation area between the two bearings. The rhomboid deformable frame has hinge points A and B arranged opposite each other. The entire rhomboid deformable frame is located within the installation area between the two bearings. Hinge point A of the rhomboid deformable frame is hinged to the front end of the first steel wire extending into the installation area, and hinge point B of the rhomboid deformable frame is hinged to the end of the two bearings that is relatively far away from the sheath tube. Two shear arms are arranged in a cross pattern and are respectively connected to hinge points B of the rhomboid deformable frame. Each of the two shear arms has a blade on one side, and the blades of the two shear arms are arranged opposite each other. The two shear arms open or close as the rhomboid deformable frame deforms.

6. The vascular endosseal scissors kit of claim 5 wherein: The blade has straight ends and a concave arc in the middle; when the two shearing arms are closed, the two concave arcs face each other and close.

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