Embolectomy apparatus for intravascular embolectomy and application of embolectomy apparatus

Abstract

The invention relates to an embolectomy apparatus for intravascular embolectomy and an application of the embolectomy apparatus. The embolectomy apparatus comprises a stent portion, a tectorial membrane portion, a proximal portion, a push-pull rod and a micro catheter. The stent portion is of a meshed structure, and the stent, under a release state, is expanded as a hollow tubular structure; many holes are formed in the far end of the tectorial membrane, so as to facilitate passing of a blood flow; the proximal portion is of a triangular or elliptic meshed opening structure with the end connected to the push-pull rod; and by virtue of the micro catheter, the embolectomy apparatus for the intravascular embolectomy is transported. With the application of the tectorial membrane stent-type embolectomy apparatus provided by the invention, acute thrombosis formed in minute blood vessels, in particular in cerebral blood vessels, can be removed conveniently; the embolectomy apparatus can prevent the prolapse of the thrombosis from meshes of the stent and protect openings of branch vessels from getting blocked; and in addition, damage to the inner walls of the blood vessels caused by steel strips of the stent. The embolectomy apparatus provided by the invention is simple, convenient and safe to operate and is convenient for popularization; and the embolectomy apparatus is applicable to broad ordinary people at salaried class.

Description

technical field [0001] The invention belongs to the field of medical devices, and in particular relates to a thrombus remover for intravascular thrombus removal and an application thereof. Background technique [0002] Acute ischemic cerebral infarction is the damage of nerve tissue caused by ischemic necrosis of local brain tissue due to sudden blockage of cerebral artery blood flow. 70%-80% of patients with severe symptoms requiring arteriography can see emboli or thrombus obstruction, and larger artery obstruction can cause 53%-92% of patients to die. Arterial recanalization is the key to the treatment of acute ischemic cerebral infarction. Currently, there are two conventional methods for the treatment of acute ischemic cerebral infarction: interventional thrombolysis and mechanical thrombectomy. Intravascular thrombolysis is to inject a thrombolytic agent into the vicinity of the thrombus blocking the artery through the catheter, and form a high concentration of throm...

AI Technical Summary

Problems solved by technology

Mechanical thrombectomy can be divided into laser ablation, thrombectomy with a trap, and thrombus removal with a thrombus trap. These methods can remove the thrombus more completely, but they will cause too much damage to the vessel wall and cause various complications.

Laser thrombolysis converts laser energy into sound energy through an optical fiber, and generates microbubbles at the end of the microcatheter and near the thrombus to ablate the thrombus to achieve the effect of recanalizing blood vessels; however, the operation is difficult, and the laser energy is too low to be ineffective. Excessive energy can damage blood vessels and cause many complications

The method of thrombectomy with the grab device is simple and causes little damage to the vessel wall, but it often fails to catch the blood clot

Thrombectomy with the thrombus-catching net is also simple, but the thrombus-catching net is too large to be used in intracranial blood vessels

Chinese invention patent 201410717947.4 discloses an adjustable thrombectomy device for intracranial blood vessels. Although the thrombectomy device is adjustable, its proximal end is tapered, and the thrombus cannot be well inserted into the thrombus retriever, and its structure is complicated. Complicated and expensive to make

Chinese invention patent 201210148897.3 discloses a thrombectomy device for intracranial blood vessels. The inner side of the mesh bar of this device is provided with some inwardly convex structures, and the proximal opening is almost consistent with the lumen of the blood vessel after opening, which is inconvenient to retract. No further adjustments even if the retriever is placed improperly

In addition, when the thrombus retriever with exposed mesh strips captures the thrombus and pulls it out, the thrombus is easily exposed through the gap between the mesh strips, and when the thrombus retriever is pulled back, the exposed thrombus part is easy to rub against the vessel wall Detachment and blockage of small blood vessel openings on the tube wall can lead to brain tissue death, cerebral infarction, and hemiplegia in patients. This is a problem often found in clinical thrombectomy practice

Furthermore, the exposed stent mesh will cause damage to the vascular endothelium and intima during the pushing and pulling process of the thrombus retriever, further inducing thrombosis

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