Pump assembly with bearing and seal-free reusable impeller for fragile and aggressive fluids

A pump for transferring fluids especially fragile and aggressive fluids such as human blood and comprising a housing having inner and outer peripheral surfaces with a sealed annular wall of uniform thickness therebetween, and with said inner peripheral surface defining a pumping chamber with a central axis, a rotor disposed within said pumping chamber, inlet port means arranged in polar relationship to said pumping chamber and coaxially with said pumping chamber during operational rotation of said rotor, an outlet port means arranged transversely and generally medially of said inlet port means, said rotor having a dual conical configuration converging toward opposed polar regions and having an axis of rotation extending between said polar regions and arranged coaxially with the axis of said pumping chamber, magnetic driven means arranged on said rotor at radially spaced locations generally medially along said axis of rotation, electromagnetic drive means coupled to a source of energy and arranged to deliver rotational driving energy to said rotor through said magnetic driven means, said pump being further characterized in that:

• (a) the housing forming said pumping chamber having a central portion of regular cylindrical configuration and with opposed conical end cap portions, said central portion comprising first and second cylindrical segments having mating end walls and being attachably coupled together at a uniform annular bonding seam formed as a continuum along said mating end walls of each of said first and second uniform annular segments, the arrangement being such that said bonding seam may be broken to separate said first and second cylindrical segments so as to permit cleaning, sterilization, and introduction of said rotor for sealed recycling into a fresh annular housing.