Hemodialysis channel thrombectomy device

Abstract

The invention provides a hemodialysis channel thrombectomy device. The device comprises a thrombectomy stent and a conveying assembly; the thrombectomy stent comprises N stent units, and each stent unit is a net-shaped stent which is large in the middle, gradually reduced towards two ends and closed at the two ends. the conveying assembly comprises an outer sheath tube, a pushing tube, an inner tube, a guide head and a suction catheter; a proximal end of the thrombectomy stent is connected with a distal end of the pushing tube, the inner tube penetrates through the pushing tube and the thrombectomy stent, a distal end of the inner tube, a distal end of the thrombectomy stent and a proximal end of the guide head are connected, and the inner tube can axially move relative to the pushing tube to adjust an axial length of the thrombectomy stent; the pushing tube can axially move relative to the outer sheath tube, the outer sheath tube is used for containing the thrombectomy stent in a compressed state, and the thrombectomy stent can be released to an expansion state by controlling the outer sheath tube to axially move towards the near end relative to the pushing tube; the outer sheath tube is arranged in the suction catheter in a penetrating mode and can pull the thrombectomy stent back into the suction catheter when the thrombectomy stent is in an expansion state, and therefore a thrombectomy effect is improved.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a thrombus removal device for hemodialysis access. Background technique [0002] A stable dialysis access is the lifeline for hemodialysis patients with end-stage renal disease, and thrombosis secondary to stenosis of autogenous arteriovenous fistula (Arteriovenous Fistula, AVG) and artificial vascular arteriovenous fistula (Arteriovenous Graft, AVG) is the most common hemodialysis vascular access Complications seriously affect the efficiency of hemodialysis. A large number of uremia patients have decreased blood flow due to narrow access, and secondary AVF intimal hyperplasia with thrombosis. If surgical intervention is not performed in time, the dialysis access needs to be rebuilt, which may be life-threatening. At present, the treatment options for AVF stenosis with acute thrombosis are endovascular thrombus removal or surgical thrombectomy. If the flow rate after thro...

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Problems solved by technology

[0003] The inventors found that the traditional Forgarty thrombus removal catheter can be used for recanalization of simple acute thrombus, but when it is applied to complex outflow tracts, the thrombus removal is not complete, so it is not suitable for all patients, especially long-term hemodialysis patients often accompanied by multiple Tumor-like expansion at the end of the vein, a large number of mural thrombus in the tumor cavity, but the existing Forgarty hemodialysis access thrombus removal device cannot fully remove thrombus in multiple AVF tumor cavities, and there are often a large number of residual thrombus or mural thrombus after thrombus removal, Vascular injury caused by repeated pulling and pulling may cause short-term recurrence of thrombus. Once it occurs, only incision and thrombectomy and open surgery can be used to reconstruct the hemodialysis access, which greatly increases the trauma and risk of the patient.

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