Abstract: The present disclosure discloses a high precision channel flow measurement device and method based on a principle of multi-point head loss. A flow velocity of a designated position is acquired by using a flow measurement tube; the flow measurement tube is moved in a vertical direction through a convex sliding block and a motion guide pillar to measure the flow velocity at different measurement points on a measurement line; an overall flow measurement part is integrally ascended, that is, the motion guide pillar leaves a water body, in combination with a load bearing telescopic lifting frame; the overall flow measurement part integrally moves left and right in a longitudinal direction through a telescopic guide rod to reach a set position; the overall flow measurement part is integrally descended through the load bearing telescopic lifting frame, that is, the motion guide pillar enters the water body to acquire the flow velocity.

Abstract: Disclosed are a thrombectomy device and a thrombectomy system, where the thrombectomy device includes a thrombectomy net, a pushing tube, and a thrombectomy tube, where the thrombectomy tube is provided with a tube cavity, the thrombectomy net has a radial contraction state and a radial expansion state, and a proximal end of the thrombectomy net is fixedly connected to a distal end of the pushing tube. The thrombectomy device further includes an action tube provided with a first action block and a second action block. A distal end of the thrombectomy net is sleeved on the action tube and slides within a limited range of distance between the first action block and the second action block. When relative displacement against the pushing tube occurs, the thrombectomy net is driven to radially contract or expand. Therefore, the contraction and expansion of the thrombectomy net of the present disclosure are controllable.

Abstract: Disclosed is a thrombectomy device with segmented design, and the device includes a thrombectomy net and a push rod fixedly connected with a proximal end of the thrombectomy net, where the thrombectomy net is a tubular hollow self-expanding net capable of automatically expanding radially, which is contracted after being compressed radially, and expands radially after a constraint of radial compression is released. The thrombectomy net includes a slope section, a thrombectomy section, and a gathering section which are sequentially connected from the proximal end to a distal end, where the thrombectomy section includes at least two thrombectomy subsections which are sequentially connected from the proximal end to the distal end and are relatively independent, and two adjacent thrombectomy subsections are locally connected, so that the two adjacent thrombectomy subsections are relatively independent during radial expansion.