Aneurysm spring ring shearing device

Abstract

The utility model provides an aneurysm spring ring shearing device, and belongs to the technical field of aneurysm treatment instruments, the aneurysm spring ring shearing device comprises an outer catheter and an inner catheter arranged in the outer catheter in a penetrating mode, and a supporting bag is arranged on the outer side of the outer catheter; two opposite blade electrodes are rotationally arranged at the far end of the inner catheter, a flexible metal woven rod penetrates through the inner catheter, a positive wire and a negative wire are arranged in the flexible metal woven rod, and a gripper, a first flexible branch wire and a second flexible branch wire extend out of the far end of the flexible metal woven rod; the positive wire and the negative wire are respectively connected with the two blade electrodes through a first flexible branch wire and a second flexible branch wire; a push-pull handle is arranged at the near end of the flexible metal braided rod; and the handle is pushed and pulled to drive the gripper to grab the spring ring, and the spring ring is pulled back to the interior of the inner catheter. The first flexible branch line and the second flexible branch line are straightened to electrically close the two blades, the end of the spring ring is cut off under the action of shearing and electrolytic disengagement of the blade electrodes, and the cut spring ring is moved out along with the inner guide pipe.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of aneurysm treatment devices, and more particularly relates to an aneurysm spring coil shearing device. BACKGROUND

[0002] The spring coil is a common clinical instrument for treating aneurysm. During treatment, the spring coil needs to be physically delivered into the aneurysm of a patient for filling, so as to promote thrombosis, prevent aneurysm bleeding or cut off the tumor blood supply. After the spring coil is delivered into the aneurysm of the patient, the spring coil needs to be released.

[0003] In the actual treatment process, when the spring coil is delivered into the aneurysm, the spring coil may partially overflow the main body of the aneurysm, at which time the part of the spring coil exposed outside the aneurysm needs to be sheared off, and the sheared spring coil needs to be removed from the blood vessel. However, there is a lack of effective devices for shearing off and removing the part of the spring coil exposed outside the aneurysm in the prior art. SUMMARY

[0004] To solve the problems in the prior art, the application provides an aneurysm spring coil shearing device which can shear off the part of the spring coil exposed outside the aneurysm and remove the sheared part from the blood vessel.

[0005] To achieve the above object, the technical scheme of the application provides an aneurysm spring coil shearing device, which comprises an outer catheter and an inner catheter slidingly arranged in the inner part of the outer catheter, a support balloon is arranged on the outer side wall of the outer catheter, the support balloon has a fluid channel connected to the proximal end of the outer catheter; two opposite blade electrodes are rotationally arranged at the distal end of the inner catheter, the tips of the two blade electrodes can rotationally abut each other, a flexible metal braided rod is arranged in the inner part of the inner catheter, the inner part of the flexible metal braided rod has a positive electrode wire and a negative electrode wire, a grabber, a first flexible branch wire and a second flexible branch wire are extended from the distal end of the flexible metal braided rod, the distal end of the positive electrode wire is connected to one of the blade electrodes through the first flexible branch wire, the distal end of the negative electrode wire is connected to the other blade electrode through the second flexible branch wire, the proximal end of the flexible metal braided rod extends out of the tail end of the inner catheter and is provided with a push-pull handle, and the proximal ends of the positive electrode wire and the negative electrode wire are provided with plugs.

[0006] The flexible metal braid rod can transmit thrust, pull and torque, and the push-pull handle can drive the gripper to extend out of the distal end of the inner catheter to grab the end of the spring ring, and then pull the gripper with the spring ring end back to the inside of the distal end of the inner catheter. The plug is used to connect with the power supply. When the gripper drives the end of the spring ring into the inner catheter, the push-pull handle continues to pull the flexible metal braid rod, the first flexible branch and the second flexible branch are straightened and the two blade electrodes are electrically closed, the two blade electrodes clamp the spring ring and form a closed loop. The end of the spring ring is cut off under the action of shearing and electrolytic separation of the blade electrode. The cut spring ring remains in the inner catheter and is removed with the inner catheter. The part of the spring ring exposed outside the aneurysm is cut off and removed from the blood vessel.

[0007] Optionally, the gripper is a memory alloy woven mesh, and the side of the gripper has an opening for accommodating the end of the spring ring. The push-pull handle drives the gripper to rotate and wrap the end of the spring ring through the flexible metal braid rod to grab the spring ring.

[0008] Optionally, the push-pull handle includes a fixed cylinder and an operating cylinder. The fixed cylinder is fixedly connected to the proximal end of the inner catheter, and the operating cylinder is threadedly screwed on the proximal end of the fixed cylinder. The flexible metal braid rod passes through the fixed cylinder and is fixedly connected to the operating cylinder. The plug is located on the proximal end side of the push-pull handle, and the positive and negative lines pass through the operating cylinder and are connected to the plug. Rotating the operating cylinder can drive the gripper to move out of the distal end of the inner catheter to rotate and wrap the end of the spring ring for grabbing. After grabbing, the gripper with the end of the spring ring is pulled back to the inside of the distal end of the inner catheter and the two blade electrodes are closed by reversing the rotation of the operating cylinder.

[0009] Optionally, the operating cylinder is provided with a support shaft extending into the fixed cylinder, and the proximal end of the flexible metal braid rod is arranged in the inside of the support shaft and fixedly connected to the support shaft. This arrangement can increase the connection length of the operating cylinder and the flexible metal braid rod, improve the connection strength, and more stably drive the flexible metal braid rod to move.

[0010] Optionally, the distal end of the flexible metal braid rod is provided with a tapered connector, the small-diameter end of the tapered connector is fixedly connected to the distal end of the flexible metal braid rod, and the large-diameter end of the tapered connector is fixedly connected to the proximal end of the gripper. During the process of pulling the gripper into the inside of the distal end of the inner catheter, the side wall of the tapered connector forms a guiding effect to avoid the proximal end of the gripper from being stuck in the distal end of the inner catheter.

[0011] Optionally, the root of each of the two blade electrodes is provided with an elastic insulating rubber pad, and the two blade electrodes are connected to the head end of the inner catheter through the elastic insulating rubber pads. When the flexible metal braid rod is pulled, the elastic insulating rubber pads make the two blade electrodes close through elastic deformation to form a closed loop.

[0012] Optionally, both blade electrodes are planar blades. When the two blade electrodes are closed, it is a line contact, which can have sufficient length to contact the spring ring, avoiding the misalignment with the position of the spring ring.

[0013] Optionally, the distal end of the inner catheter is provided with an insulating shield that shields both sides of the gap between the two blade electrodes. The cut spring ring is limited inside the inner catheter due to the shielding effect of the insulating shield, and will not overflow from the gap between the two blade electrodes into the blood vessel, ensuring that the cut spring ring can follow the inner catheter out.

[0014] The technical solution of the present application has the following beneficial effects over the prior art:

[0015] The outer catheter is used to be arranged in the access catheter. The access catheter is a surgical access arranged near the aneurysm, which can be intervened when the spring ring is disposed at the aneurysm. Through the fluid passage, physiological saline or gas can be input into the support balloon for support, fixing the position of the outer catheter and reducing the amount of bleeding. The inner catheter transports the blade electrode and the gripper to the spring ring to be cut. The push-pull handle can drive the gripper to extend out of the distal end of the inner catheter to grab the end of the spring ring, and pull the gripper with the end of the spring ring back to the inside of the distal end of the inner catheter. Under the influence of blood flow, the end of the spring ring will drift with the direction of the blood flow. Since the distal end of the flexible metal braided rod is flexible, when the gripper extends out of the distal end of the inner catheter, the gripper can drift with the direction of the blood flow to the end of the spring ring, facilitating the alignment between the spring ring and the gripper. When the gripper drives the end of the spring ring into the inner catheter, the push-pull handle continues to pull the flexible metal braided rod, the first flexible branch and the second flexible branch are straightened and the two blade electrodes are closed. The two blade electrodes clamp the spring ring and form a closed loop. The end of the spring ring is cut off under the action of the blade electrode cutting and electrolytic detachment. The cut spring ring remains inside the inner catheter and follows the inner catheter out. The device effectively realizes the function of cutting off the part of the spring ring exposed outside the aneurysm and removing the cut part from the blood vessel. The device can simultaneously realize the cutting and removal of the spring ring, without the need to replace the device during operation, and the operation is convenient. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0017] Figure 1 The overall structure of the aneurysm spring ring cutting device when the gripper extends out of the inner catheter;

[0018] Figure 2 As Figure 1 Partial enlarged view at A in the middle;

[0019] Figure 3 As a whole structure schematic diagram of aneurysm coil shearing device when the handle is inserted into the inner catheter;

[0020] Figure 4 As Figure 3 Partial enlarged view at B in the middle;

[0021] Figure 5 As a handle structure schematic diagram;

[0022] Figure 6 As an inner catheter distal end structure schematic diagram.

[0023] Figure legend: 100, access catheter; 200, coil; 1, outer catheter; 101, support balloon; 102, fluid channel; 2, inner catheter; 201, insulation barrier; 3, blade electrode; 4, flexible metal braid rod; 5, handle; 501, opening; 6, first flexible branch line; 7, second flexible branch line; 8, push-pull handle; 801, fixed cylinder; 802, operating cylinder; 803, support shaft; 9, plug; 10, conical connector; 11, elastic insulation rubber pad. DETAILED DESCRIPTION

[0024] In order to make the technical problems, technical solutions and beneficial effects of the present application more clearly understood, the present application will be further described in detail below in conjunction with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0025] Embodiment:

[0026] The present embodiment provides an aneurysm coil shearing device. In the present embodiment, the distal end refers to the end pointing towards the aneurysm, and the proximal end refers to the end pointing away from the aneurysm.

[0027] Based on Figures 1 to 4 As shown, the aneurysm coil shearing device includes an outer catheter 1 and an inner catheter 2 slidingly arranged inside the outer catheter 1. The outer side wall of the outer catheter 1 is provided with a support balloon 101, and the support balloon 101 has a fluid channel 102 communicating with the proximal end of the outer catheter 1. The outer catheter 1 is arranged in an access catheter 100. The access catheter 100 is a catheter used to establish an external access to the aneurysm position during the operation, and has been established during the previous operation of placing the coil 200. After the outer catheter 1 is inserted into the access catheter 100, the support balloon 101 can be inflated against the inner wall of the access catheter 100 by injecting normal saline or inflating, so as to ensure the stability of the outer catheter 1, and at the same time to block the access catheter 100 and reduce the amount of bleeding.

[0028] On the basis of the above structure, the distal end of the inner catheter 2 is rotatably provided with two opposite blade electrodes 3, the tips of the two blade electrodes 3 can be rotatably abutted with each other to form a loop. A flexible metal braid 4 is arranged inside the inner catheter 2. The flexible metal braid 4 has a positive line and a negative line (not shown in the figure) inside, the distal end of the flexible metal braid 4 extends out a handle 5, a first flexible branch line 6 and a second flexible branch line 7, the distal end of the positive line is connected with one of the blade electrodes 3 through the first flexible branch line 6, the distal end of the negative line is connected with the other blade electrode 3 through the second flexible branch line 7, the proximal end of the flexible metal braid 4 extends out of the tail end of the inner catheter 2 and is provided with a push-pull handle 8, and the proximal ends of the positive line and the negative line are provided with a plug 9.

[0029] The plug 9 is used to be connected with a power supply, and the flexible metal braid 4 can transmit thrust, tension and torque. By pushing the flexible metal braid 4 through the push-pull handle 8, the handle 5 can be extended out of the distal end of the inner catheter 2 to grab the end of the spring ring 200, at this time, the first flexible branch line 6 and the second flexible branch line 7 are in a relaxed state. Under the influence of blood flow, the end of the spring ring 200 will drift with the direction of the blood flow. Since the distal end of the flexible metal braid 4 is flexible, when the handle 5 is extended out of the distal end of the inner catheter 2, the handle 5 can drift with the direction of the blood flow to the end of the spring ring 200 to realize the alignment between the end of the spring ring 200 and the handle 5, and the handle 5 grabs the end of the spring ring 200. Then, the flexible metal braid 4 is pulled into the inner catheter 2 through the push-pull handle 8, so that the handle 5 enters the inner catheter 2, and the end of the spring ring 200 also enters the inner catheter 2. At this time, the flexible metal braid 4 is continuously pulled through the push-pull handle 8, the first flexible branch line 6 and the second flexible branch line 7 are straightened and the two blade electrodes 3 are closed, the two blade electrodes 3 clamp the spring ring 200 and form a closed loop. The end of the spring ring 200 is cut off under the action of the shearing and electrolytic separation of the blade electrodes 3, and at this time the power supply is turned off. Since the distal end of the inner catheter 2 is closed by the two closed blade electrodes 3, the cut spring ring 200 is limited in the inner catheter 2, and by pulling the inner catheter 2 out of the outer catheter 1, the cut spring ring 200 can be removed from the human body. The device can simultaneously realize the cutting and removing operations of the spring ring 200, and does not need to replace the device during the operation, which is convenient to operate.

[0030] Among them, based on Figures 1 to 5As shown, the gripper 5 is a memory alloy woven mesh. The gripper 5 is in a curled state when inside the inner catheter 2. When the gripper 5 moves out of the distal end of the inner catheter 2 to grab the spring ring 200, the gripper 5 is unfolded. After unfolding, the gripper 5 has an opening 501 on the side to accommodate the end of the spring ring 200. The push-pull handle 8 drives the gripper 5 to rotate through the flexible metal woven rod 4, so that the end of the spring ring 200 is aligned and enters the opening 501. Then, the push-pull handle 8 drives the gripper 5 to rotate through the flexible metal woven rod 4, so that the end of the spring ring 200 is wrapped and grabbed. After grabbing the spring ring 200, the gripper 5 is squeezed into the distal end of the inner catheter 2 under the pulling action of the flexible metal woven rod 4, and the end of the spring ring 200 is also brought into the distal end of the inner catheter 2.

[0031] Based on Figure 1 and Figure 3 As shown, the push-pull handle 8 includes a fixed cylinder 801 and an operating cylinder 802. The fixed cylinder 801 is fixedly connected to the proximal end of the inner catheter 2, and the operating cylinder 802 is threadedly screwed onto the proximal end of the fixed cylinder 801. The flexible metal woven rod 4 passes through the fixed cylinder 801 and is fixedly connected to the operating cylinder 802. The plug 9 is located on the proximal end side of the push-pull handle 8, and the positive and negative lines pass out of the operating cylinder 802 and are connected to the plug 9. During operation, the operating cylinder 802 is rotated and axially moved relative to the fixed cylinder 801 by rotating the operating cylinder 802, so as to push the gripper 5 out of the distal end of the inner catheter 2 through the flexible metal woven rod 4 to rotate and wrap the end of the spring ring 200 for grabbing, and then the gripper 5 with the end of the spring ring 200 is pulled back to the distal end of the inner catheter 2 by reversing the rotation of the operating cylinder 802 to close the two blade electrodes 3. Alternatively, there is a second operation mode. The operating cylinder 802 is rotated and axially moved relative to the fixed cylinder 801 by rotating the operating cylinder 802, so that the gripper 5 is brought out of the distal end of the inner catheter 2 by the flexible metal woven rod 4. The inner catheter 2 is rotated by rotating the fixed cylinder 801 and the operating cylinder 802 at the same time, so as to rotate the gripper 5 and wrap the spring ring 200 for grabbing. Then the gripper 5 with the end of the spring ring 200 is pulled back to the distal end of the inner catheter 2 by reversing the rotation of the operating cylinder 802 to close the two blade electrodes 3.

[0032] Preferably, the axis of the operating cylinder 802 is provided with a support shaft 803 extending into the fixed cylinder 801, and the proximal end of the flexible metal woven rod 4 is arranged inside the support shaft 803 and fixedly connected to the support shaft 803. This arrangement can increase the connection length of the operating cylinder 802 and the flexible metal woven rod 4, improve the connection strength, and more stably drive the flexible metal woven rod 4 to move.

[0033] Preferably, based on Figure 2 and Figure 4As shown in the drawings, the distal end of the flexible metal braid rod 4 is provided with a tapered connector 10, the small-diameter end of which is fixedly connected with the distal end of the flexible metal braid rod 4, and the large-diameter end of which is fixedly connected with the proximal end of the gripper 5. During the process of pulling the gripper 5 into the inside of the distal end of the inner catheter 2, the side wall of the tapered connector 10 forms a guiding effect to avoid the proximal end of the gripper 5 from being stuck with the distal end of the inner catheter 2.

[0034] Further, based on Figure 2 , Figure 4 and Figure 6 As shown in the drawings, the root of each of the two blade electrodes 3 is provided with an elastic insulating rubber pad 11 which can be made of elastic rubber. The two blade electrodes 3 are connected with the head end of the inner catheter 2 through the elastic insulating rubber pads 11. When the flexible metal braid rod 4 is pulled, the elastic insulating rubber pads 11 make the two blade electrodes 3 close through elastic deformation, forming a closed loop.

[0035] Preferably, based on Figure 6 As shown in the drawings, the two blade electrodes 3 are both planar blades. When the two blade electrodes 3 are closed, they are in line contact, which can have sufficient length to contact the spring ring 200, avoiding misalignment with the position of the spring ring 200. At the same time, the distal end of the inner catheter 2 is provided with an insulating shielding part 201 which shields both sides of the gap between the two blade electrodes 3. The cut spring ring 200 is limited inside the inner catheter 2 due to the shielding effect of the insulating shielding part 201, and will not overflow from the gap between the two blade electrodes 3 to the outside, ensuring that the cut spring ring 200 can follow the inner catheter 2 to move out.

[0036] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An aneurysm coil shearing device, comprising an outer catheter and an inner catheter slidingly arranged inside the outer catheter, an outer sidewall of the outer catheter is provided with a support balloon, the support balloon has a fluid channel communicated to a proximal end of the outer catheter; characterized in that a distal end of the inner catheter is rotatably provided with two opposite blade electrodes, tip ends of the two blade electrodes are rotatably abuttable with each other, an inside of the inner catheter is provided with a flexible metal braid, an inside of the flexible metal braid has a positive wire and a negative wire, a distal end of the flexible metal braid extends out with a handle, a first flexible branch wire and a second flexible branch wire, a distal end of the positive wire is connected with one of the blade electrodes through the first flexible branch wire, a distal end of the negative wire is connected with the other blade electrode through the second flexible branch wire, a proximal end of the flexible metal braid extends out of a tail end of the inner catheter and is installed with a push-pull handle, proximal ends of the positive wire and the negative wire are provided with a plug; the handle can drive the flexible metal braid to extend out of the distal end of the inner catheter to grab an end of a coil, and the handle with the grabbed end of the coil is pulled back to the inside of the distal end of the inner catheter.

2. The aneurysm spring clip shearing device of claim 1, wherein: the handle is a memory alloy braided net, a side of the handle has an opening for accommodating the end of the coil, the push-pull handle is operated to drive the handle to rotate and wrap the end of the coil through the flexible metal braid.

3. The aneurysm spring clip shearing device of claim 2, wherein: the push-pull handle comprises a fixed cylinder and an operating cylinder, the fixed cylinder is fixedly connected with the proximal end of the inner catheter, the operating cylinder is threadedly screwed on an outside of the proximal end of the fixed cylinder, the flexible metal braid passes through the fixed cylinder and is fixedly connected with the operating cylinder, the plug is located on a proximal end side of the push-pull handle, and the positive wire and the negative wire pass out of the operating cylinder and are connected to the plug.

4. The aneurysm spring clip shearing device of claim 3, wherein: an axis of the operating cylinder is provided with a support shaft extending into the fixed cylinder, a proximal end of the flexible metal braid passes through an inside of the support shaft and is fixedly connected with the support shaft.

5. The aneurysm spring clip shearing device of claim 1 wherein: a distal end of the flexible metal braid is provided with a tapered connector, a small-diameter end of the tapered connector is fixedly connected with the distal end of the flexible metal braid, and a large-diameter end of the tapered connector is fixedly connected with a proximal end of the handle.

6. An aneurysm spring clip shearing device according to any one of claims 1-5, wherein: a root of each of the two blade electrodes is installed with an elastic rubber pad, and each of the two blade electrodes is connected with the distal end of the inner catheter through the elastic rubber pad.

7. An aneurysm spring clip shearing device according to any one of claims 1-5, wherein: each of the two blade electrodes is a planar blade.

8. The aneurysm spring clip shearing device of claim 7, wherein: the distal end of the inner catheter is provided with an insulating shielding part shielding both sides of a gap between the two blade electrodes.

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