Bi-directional puncture sheath

Abstract

The invention discloses a puncture sheath with a bidirectional puncture function. The puncture sheath comprises a sheath canal assembly and a sheath core assembly; the sheath canal assembly comprises a sheath canal and a sheath canal accessory, a through sheath canal inner cavity is formed in the sheath canal, the sheath canal accessory is connected to the rear portion of the sheath canal, and the sheath core assembly is inserted into the sheath canal inner cavity from the sheath canal accessory and axially moves along the sheath canal inner cavity; the sheath core assembly comprises at least one bent sheath core assembly body, each bent sheath core assembly body comprises a linear sheath core pipe and a bent sheath core pipe with a shape memory function, the near end of the bent sheath core pipe is connected with the linear sheath core pipe, and the far end of the bent sheath core pipe is connected with a sheath core head; in a free state, the bent sheath core pipe bends toward the side of the linear sheath core pipe and is constrained in a straight state in the sheath canal inner cavity. The advancing direction of a guide wire can be controlled accurately, retrograde and prograde motion admission passage operations can be completed at the same puncture point, particularly in interventional therapy of bilateral lower limb artery lesions, secondary puncture is avoided in the same operation, the guide wire can be smoothly conveyed to lesion regions on the same side or the opposite sides, and interventional therapy of bilateral limbs at the same side is completed at the same time.

Description

technical field [0001] The invention belongs to the technical field of medical puncture sheaths, and relates to a puncture sheath, in particular to a bidirectional puncture sheath capable of retrograde puncture and antegrade puncture. The present invention can be used in the process of interventional treatment of bilateral lower extremity arterial lesions, and can smoothly deliver the guide wire to the puncture sheath of the ipsilateral and contralateral lesion areas without secondary puncture. Background technique [0002] The current relatively advanced method for the treatment of vascular stenosis and occlusive lesions is the use of minimally invasive interventional treatment, that is, percutaneous transluminal angioplasty (PTA) and stent placement for treatment. For example, there are two main puncture approaches for interventional therapy of lower extremity arterial occlusive disease: [0003] 1. If the lesion is located at the beginning or upper part of the superficia...

AI Technical Summary

Problems solved by technology

[0008] ②The unobstructed approach is to postpone the treatment of the lesion on the other side, which requires multiple interventional operations, increases surgical trauma and risks, and also wastes social medical data to a certain extent

[0009] ③Sometimes upper extremity arterial puncture is used to treat lower extremity arterial disease, but compared with femoral artery puncture, upper extremity arterial puncture has thinner blood vessels and is more difficult to puncture, or vasospasm or hematoma is prone to occur when the guide wire stimulates blood vessels repeatedly. Possibility of vascular injury, increasing the risk of upper extremity complications

[0011] 1. When the guide wire comes out of the window, the guide wire will point to the direction perpendicular to the catheter, that is, to the direction of the vessel wall. After the tip of the guide wire touches the vessel wall, it may advance in the retrograde direction or in the antegrade direction. Inability to control the direction of advance of the wire well, i.e. the wire does not advance exactly in the intended direction

[0012] 2. For interventional treatment of lower extremity arteries, a puncture sheath of 7F or smaller is generally used, and its inner diameter is about 2.33mm. And the guide wire has a certain supporting capacity, if the guide wire wants to continue to move forward, it needs a large thrust to complete it, and the operation is difficult

If the force used in the puncture process is large, the friction between the puncture catheter and the puncture blood vessel will increase, and the probability of complications such as bleeding, hematoma, and pseudoaneurysm in the puncture part will increase, and the damage to the human body will increase. At the same time, If a large instantaneous thrust is applied to the guide wire, the guide wire is likely to transmit force to the vessel wall, causing certain damage to the vessel wall

[0013] 3. The size or wall thickness of the puncture sheath increases due to the closure device or the curved channel on the sheath wall

[0015] 1. The balloon is a round sphere. When the tip of the guidewire catheter touches the balloon, the forward direction of the tip cannot be controlled, that is, it cannot be ensured that one pointing in the antegrade direction and the other pointing in the retrograde direction;

[0016] 2. The balloon and two guide wires are in the lumen of the sheath at the same time, which increases the size and hardness of the sheath and increases the damage to the patient

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