Embolization microcatheter with detachable head end and method

Abstract

This invention relates to a detachable microcatheter and method for embolization, belonging to the technical field of surgical instruments for cerebrovascular malformations. The invention comprises an embolization microcatheter with an outer tube, an inner tube, and a weak occlusion as a catheter device for cerebrovascular malformation surgery. Fluid is injected into the bypass tube of the outer tube to break the weak occlusion, thereby achieving detachment of the embolization microcatheter. This avoids adhesion between the microcatheter and cerebral blood vessels, and allows for effective detachment of the microcatheter, with the detachment status monitored by a pressure pump. This improves the efficiency of cerebrovascular malformation surgery and reduces surgical costs.

Description

Technical Field

[0001] The invention relates to an embolization microcatheter with a detachable head end and a method thereof, belonging to the technical field of surgical instruments for cerebrovascular malformations. Background Art

[0002] Cerebral vascular malformations are congenital vascular abnormalities in the early embryonic stage. They can be divided into five categories according to their morphology, namely arteriovenous malformations, venous hemangiomas, varicose veins, telangiectasias, and cavernous hemangiomas. Among cerebral vascular malformations, arteriovenous malformations are the most common. Cerebral vascular malformations are also called cerebral hemangiomas and cerebral arteriovenous malformations.

[0003] At present, cerebrovascular malformation surgery is generally used to prevent rebleeding, relieve epilepsy, treat or improve neurological dysfunction. Embolization therapy, i.e. intravascular therapy, is now widely used. Embolization therapy is to inject plugs into the supply vessels of the diseased organs through arterial or intravenous catheters in a controlled manner, in order to achieve the purpose of controlling bleeding, treating tumors and vascular lesions, and eliminating the function of diseased organs; however, in actual surgery, since it is necessary to apply glue to the cerebrovascular malformation through a microcatheter, the glue will overflow from the distal end of the microcatheter and adhere to the cerebral blood vessel wall. Therefore, when withdrawing the catheter, it will be difficult to drag it due to the adhesion phenomenon. If the dragging force is too strong, it will cause the cerebrovascular bleeding again. At present, there are few technologies that can solve this problem.

[0004] CN209075813U shows a microcatheter with a detachable balloon at the tip. The scheme is to degrade the connection of the sleeve structure by injecting an adhesive that slowly degrades upon contact with dimethyl sulfoxide. However, the adhesive itself is toxic, and the dosage used is difficult to control and can easily cause secondary damage to cerebral blood vessels. At the same time, the scheme cannot achieve the effect of degradation and release. In actual operation, it is difficult to judge whether the release is successful. Incomplete degradation often leads to residual involvement at the connection, thus affecting the release of the microcatheter. Summary of the invention

[0005] In order to solve the above problems, in a first aspect, the present invention provides an embolization microcatheter with a detachable head end, which acts on the malformed part of the cerebral blood vessels, and the embolization microcatheter comprises:

[0006] An outer tube, one side of the proximal end of the outer tube is connected to a bypass tube, and the bypass tube is connected to a pressure pump;

[0007] An inner tube, the proximal end of the inner tube is connected to a syringe, the inner tube is embedded in the outer tube and a gap space is formed between the inner tube and the outer tube, and the gap space is connected to the bypass tube; a weak block is provided near the distal end of the gap space, the weak block can isolate the fluid exchange between the proximal and distal ends of the gap space in a natural state, and the weak block will rupture after receiving a target pressure and separate the outer tube and the inner tube at the proximal and distal ends of the weak block at the same time;

[0008] The outer tube and the inner tube are sealed and connected as a whole at the distal end port and the proximal end port respectively, so that the bypass tube and the gap space form a closed environment.

[0009] It should be understood that the distal end refers to the end away from the operator, and the proximal end refers to the end close to the operator; the outer tube and the inner tube are connected to form an integrated embolization microcatheter, rather than two separate and independent single tubes; when the weak blockage is destroyed, the embolization microcatheter will separate at the weak blockage, so that the inner tube and the outer tube will separate at the same time.

[0010] Furthermore, the angle between the bypass tube and the proximal inlet is an acute angle, which facilitates the injection of the fluid in the bypass tube toward the distal end of the gap space and prevents the fluid from flowing back into the proximal end of the gap space or the proximal end port of the outer tube.

[0011] In one embodiment of the present invention, the weak blocker is a membrane or sheet-like structure; the weak blocker has a protrusion toward the distal end, which is used for the fluid to impact the weak blocker more effectively, ensuring that the weak blocker can be broken when the target pressure is reached; preferably, the weak blocker is made of the same material as the outer tube and the inner tube, which facilitates the integrated production of the outer tube, inner tube and weak blocker.

[0012] In a second aspect, the present invention provides a method for releasing the embolic microcatheter from the malformed part of the cerebral blood vessel, the method comprising the following steps:

[0013] Step 1: Connect and install a syringe at the proximal end of the inner tube to manually push and apply glue;

[0014] Step 2: Connect and install a pressure pump at the proximal end of the bypass tube and check whether the weak blockage is leaking;

[0015] Step 3: Intake fluid into the bypass tube through a pressure pump so that the fluid fills the proximal end of the interstitial space;

[0016] Step 4: Pressurize the ingested fluid to the target pressure to rupture the weak blockage, and separate the outer tube and inner tube at the proximal and distal ends of the weak blockage at the same time, and then manually remove and release the outer tube and inner tube at the proximal end of the weak blockage.

[0017] In one embodiment of the present invention, whether the weak blockage is broken is detected by the dial of the pressure pump. If the pressure value displayed on the dial drops suddenly from the target pressure, it means that the weak blockage has been broken and can be released.

[0018] Furthermore, in step 4, the target pressure is set to 4Pa.

[0019] Beneficial effects of the present invention:

[0020] The present invention provides an embolization microcatheter with an outer tube, an inner tube and a weak blockage as a catheter instrument for cerebrovascular malformation surgery. The weak blockage is broken by injecting fluid into the bypass tube of the outer tube to achieve the release and separation of the embolization microcatheter. In this way, adhesion of the microcatheter to the cerebral blood vessels can be avoided. At the same time, the microcatheter can be effectively released and the release status can be observed through the instrument of the pressure pump, thereby improving the efficiency of cerebrovascular malformation surgery and reducing the cost of surgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure in one embodiment of the present invention (the weak block is in a natural state).

[0022] Figure 2 It is a schematic diagram of the overall structure in one embodiment of the present invention (the weak barrier is in a broken state).

[0023] In the figure, 1: outer tube, 2: inner tube, 3: weak blockage, 4: syringe, 5: pressure pump, 6: bypass tube, 7: gap space. DETAILED DESCRIPTION

[0024] Example 1

[0025] The present invention provides an embolization microcatheter with a detachable head end, which acts on the deformed part of cerebral blood vessels. The embolization microcatheter comprises:

[0026] An outer tube 1, one side of the proximal end of the outer tube 1 is connected to a bypass tube 6, and the bypass tube 6 is connected to a pressure pump 5;

[0027] An inner tube 2, the proximal end of the inner tube 2 is connected to a syringe 4, the inner tube 2 is embedded in the outer tube 1 and a gap space 7 is formed between the inner tube 2 and the outer tube 1, and the gap space 7 is connected to the bypass tube 6; a weak block 3 is provided near the distal end of the gap space 7, and the weak block 3 can isolate the fluid exchange between the proximal and distal ends of the gap space 7 in a natural state, and the weak block 3 will rupture after being subjected to a target pressure and separate the outer tube 1 and the inner tube 2 at the proximal and distal ends of the weak block 3 at the same time;

[0028] The outer tube 1 and the inner tube 2 are sealed and connected as a whole at the distal end port and the proximal end port respectively, so that the bypass tube 6 and the gap space 7 form a closed environment.

[0029] The outer tube 1 and the inner tube 2 are connected to form an integrated embolization microcatheter, rather than two separate single tubes; when the weak blockage 3 is destroyed, the embolization microcatheter will separate at the weak blockage 3, so that the inner tube 2 and the outer tube 1 will separate at the same time.

[0030] The angle between the bypass tube 6 and the proximal inlet is an acute angle, which facilitates the fluid in the bypass tube 6 to be injected toward the distal end of the gap space 7 and prevents it from flowing back into the proximal end of the gap space 7 or the proximal end port of the outer tube.

[0031] The weak blocker 3 is a membrane or sheet structure; the weak blocker 3 has a protrusion toward the distal end, which is used for the fluid to impact the weak blocker 3 more effectively, ensuring that the weak blocker 3 can be broken when the target pressure is reached; the weak blocker 3 is made of the same material as the outer tube 1 and the inner tube 2.

[0032] Example 2

[0033] The present invention provides a method for releasing the embolic microcatheter when it acts on the malformed part of the cerebral blood vessel, and the method comprises the following steps:

[0034] Step 1: Connect and install the syringe 4 at the proximal end of the inner tube 2 to manually push the glue;

[0035] Step 2: Install a pressure pump 5 at the proximal end of the bypass pipe 6, and use the dial of the pressure pump 5 to detect whether there is air leakage in the gap space, thereby checking whether the weak block 3 is leaking;

[0036] Step 3: The pressure pump 5 is used to draw fluid with initial pressure into the bypass tube 6, so that the fluid fills the proximal end of the interstitial space;

[0037] Step 4: pressurize the ingested fluid to the target pressure so that the weak blockage 3 ruptures (use the dial of the pressure pump 5 to detect whether the weak blockage 3 is ruptured. If the pressure value displayed on the dial drops sharply from the target pressure, it means that the weak blockage 3 has been ruptured and can be released). At the same time, the outer tube 1 and the inner tube 2 at the proximal and distal ends of the weak blockage 3 are separated at the same time, and then the outer tube 1 and the inner tube 2 at the proximal end of the weak blockage 3 are manually withdrawn to release it.

[0038] Furthermore, in step 4, the target pressure is set to 4Pa.

[0039] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Anyone familiar with this technology can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the definition of the claims.

Claims

1. An embolization microcatheter with a detachable tip, acting on the malformed part of the cerebral blood vessels, characterized in that: The embolization microcatheter comprises: An outer tube, one side of the proximal end of the outer tube is connected to a bypass tube, and the bypass tube is connected to a pressure pump; An inner tube, the proximal end of the inner tube is connected to a syringe, the inner tube is embedded in the outer tube and a gap space is formed between the inner tube and the outer tube, and the gap space is connected to the bypass tube; a weak block is provided near the distal end of the gap space, the weak block can isolate the fluid exchange between the proximal and distal ends of the gap space in a natural state, the weak block will rupture after receiving a target pressure and separate the outer tube and the inner tube at the proximal and distal ends of the weak block at the same time; the weak block is a membrane or sheet-like structure, and the weak block has a protrusion toward the distal end; the weak block is made of the same material as the outer tube and the inner tube; The outer tube and the inner tube are sealed and connected as a whole at the distal end port and the proximal end port respectively, so that the bypass tube and the gap space form a closed environment.

2. The embolization microcatheter with a detachable tip according to claim 1, characterized in that: The angle between the bypass tube and the proximal inlet of the outer tube is an acute angle.

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