Covered stent conveyor and conveying method thereof

Abstract

The invention discloses a covered stent conveyor, which comprises a conveyor head, a catheter, an axle tube and a sheath, wherein the catheter, the axle tube and the sheath are sheathed in sequence from inside to outside; a ring cavity used for accommodating a covered stent is formed between the sheath and the axle tube; a support fixed head externally sheathed with the catheter is additionally arranged between the conveyor head and the axle tube; the support fixed head is a column body; the front end face of the support fixed head is provided with at least two positioning columns sheathed into a coil at the front end of the covered stent; the end face of the tail end of the conveyor head is provided with positioning holes which correspond to the positioning columns; the positioning holes and the positioning columns sheathed in the coil are in close fit; the rear end face of the support fixed head is connected with the front end of the axle tube; the sheath is removed to enable the rear end of the covered stent to be released first; and the conveyor head is pushed to enable the positioning holes to be separated from the positioning columns, so as to enable the front end of the covered stent to be released last. The invention also discloses a conveying method of the covered stent conveyor. According to the covered stent conveyor and the conveying method thereof disclosed by the invention, the reverse release of the covered stent can be realized; and the covered stent is fixed at a preoperative preset operation position, so that the achievement ratio of operation is greatly improved.

Description

technical field [0001] The invention relates to a medical device, in particular to a stent-graft delivery device and a delivery method of the stent-graft delivery device. Background technique [0002] The human thoracic aorta is divided into three parts: the ascending aorta, the aortic arch, and the descending aorta. It is an important vascular channel that connects the heart with the carotid artery, cerebral artery, and abdominal aorta for systemic blood shunting. The vascular channel of the thoracic aorta is relatively tortuous, and the vascular wall bears a large impact of blood pressure. The vascular wall is often damaged by atherosclerotic plaque, infection, cystic necrosis of the middle layer, and trauma, and thoracic aortic aneurysm is easily formed. Once the thoracic aortic aneurysm ruptures, a large amount of blood will be infused into the chest cavity, and the patient's circulating blood volume will be insufficient, resulting in ischemic shock or even death. [00...

AI Technical Summary

Problems solved by technology

[0007] The existing conveyor has the following defects: (1) the front end of the stent-graft is released first, and the stent-graft is prone to shift under the impact force of the blood flow, and is not fixed at the pre-operative predetermined operation position. The operation is declared a failure, and then the patient needs to undergo a thoracotomy for post-processing of the failed operation. During the treatment, the patient's intact blood vessels will be damaged, causing a greater physical burden on the patient than traditional operations; (2) easy In the event of stent release jamming, during the process of removing the sheath, the tail end of the covered stent will be stuck between the shaft tube and the sheath, causing the covered stent to be unable to be released smoothly, resulting in failure of the operation

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