A bladed disc for masking a moving disc of a jet engine, including blades, each blade including a pressure-side wall and a suction-side wall that meet at a leading-edge and at a trailing edge, and wherein each blade has a pressure-side wall and a suction-side wall each including a concave zone and a convex zone that are at a distance from the leading-edge and from the trailing edge and are spaced apart from one another, these concave zones and these convex zones each extending over the majority of the height of the blade, the concave zone of the pressure-side wall is opposite the convex zone of the suction-side wall, the concave zone of the suction-side wall is opposite the convex zone of the pressure-side wall.

Mechanical circulatory supports configured to operate in series with the native heart are disclosed. In an embodiment, an intravascular propeller is installed into the descending aorta and anchored within via an expandable anchoring mechanism. The propeller and anchoring mechanism may be foldable so as to be percutaneously deliverable to the aorta. The propeller may have foldable blades. The blades may be magnetic and may be driven by a concentric electromagnetic stator circumferentially outside the magnetic blades. The stator may be intravascular or may be configured to be installed around the outer circumference of the blood vessel. The support may create a pressure rise between about 20-50 mmHg, and maintain a flow rate of about 5 L/min. The support may have one or more pairs of contra-rotating propellers to modulate the tangential velocity of the blood flow. The support may have static pre-swirlers and or de-swirlers. The support may be optimized to replicate naturally occurring vortex formation within the descending aorta.

A screw system including a plurality of segmented blades. Each blade segment of the plurality of blade segments including a mounting portion and a vane portion. The mounting portion, having a helical length, for removably attaching the blade segment. The vane portion extending from the mounting portion along the helical length thereof. The vane portion having a front surface that is not parallel to a back surface from the mounting portion to a tip of the blade segment, along the helical length.

A non-occluding intravascular pump comprises a shroud providing an inlet for incoming blood flow and an outlet for outgoing blood flow, wherein the shroud is a cylindrical housing; an impeller positioned within shroud, wherein a central axis of the shroud and impeller are shared; a motor coupled to the impeller, wherein the motor rotates the impeller to causes blood to be drawn through the inlet and output to the outlet, and the motor is centrally disposed and shares the central axis with the shroud and the impeller; and a plurality of pillars coupling the motor to the shroud, wherein the pillars secure the shroud in close proximity to the impeller. Various design features of the pump may be optimized to reduce hemolysis, such as, but not limited to, inlet length, impeller design, pillar angle, and outlet design.

A heat dissipation fan including a hub and a plurality of fan assemblies are provided. The fan assemblies are disposed around the hub, and each of the fan assemblies includes at least two blades. A runner is formed between the at least two blades. A width of the runner gradually reduces along a rotating axis of the hub.

An apparatus for cleaning nets underwater formed from a propeller housing with a centrally disposed axis with a plurality of blades extending therefrom. An outer perimeter ring secured to an outer tip of each blade with a plurality of knuckles secured to the outer perimeter ring. Each knuckle including a curved surface constructed and arranged to be forcefully presented to the aquaculture net upon rotation of said blades for removal of growth by impact and shaking of the aquaculture net. An elastomeric hub prevents spike loads.

The invention relates to an impeller (1) for an implantable, vascular support system (2), at least comprising: —an impeller body (3) having a first longitudinal portion (4) and a second longitudinal portion (5); —at least one blade (6) formed in the first longitudinal portion (4) and designed to axially convey a fluid by means of a rotational movement; —at least one magnet (7) provided and encapsulated in the second longitudinal portion (5).

A turbo-molecular pump comprises multiple stages of rotor blades and multiple stages of stator blades. When m is a positive real number equal to or less than a total number of stages of the rotor blades and greater than one and K is a natural number which is not a multiple of m in a case where m is a natural number and is a natural number in a case where m is not the natural number, the multiple stages of the rotor blades include a rotor blade at an inter-blade angle α1, and a rotor blade of which reference position is phase-shifted from a reference position of the rotor blade at the inter-blade angle α1 by an angle α1.Math.K/m.

A ceiling fan and a fan set are provided. The fan set includes an upper fixed plate, a lower fixed plate, and a plurality of fan blades. The upper fixed plate has a plurality of first through holes that are in a ring-shaped arrangement, and the lower fixed plate has a plurality of second through holes that are in a ring-shaped arrangement. The quantity of the second through holes is equal to the quantity of the first through holes, and the positions of the second through holes respectively correspond to the positions of the first through hole. Each of the fan blades has an assembly portion, a blade portion, and three fasteners. The fasteners pass through the first through holes and the second through holes such that each of the fan blades is fastened between the upper fixed plate and the lower fixed plate.

A pump assembly can pump fluid with a single moving part, where the single moving part is free floating, inline within a sealed fluid path. The pump includes a stator core having a cylindrical shape with an opening through it. The stator includes electromagnetic coils arranged around a lateral surface of the stator core extending away from the center of the stator core. The pump assembly includes an impeller to spin within the cylindrical opening of the stator in response to selective charging of the electromagnetic coils. The impeller includes a cylindrical body having blades that align with the electromagnetic coils to create a magnetic flux path between selected coils through the impeller in response to selective charging of the electromagnetic coils.