Patent ID: 8628302
Filing Date: 2014-01-14
Classification: A61M,F01D,F04D

Abstract:
1. An impeller comprising: a first radially-inner shroud having a substantially planar shape and; a second radially-outer shroud having a truncated frustoconical shape, said radially-inner shroud having an outer diameter smaller than an inner diameter of said radially-outer shroud defined by a center opening; a plurality of vanes extending between the first radially-inner shroud and the second radially-outer shroud, each of said plurality of vanes including a first radially-extending edge in contact with the first radially-inner shroud and a second radially-extending edge including a radially-outer portion in contact with the second radially-outer shroud along an entire radial length of said second radially-outer shroud, wherein a relatively shorter radially-inner portion of the second radially-extending edge is not in contact with or adjacent the second radially-outer shroud and a relatively longer radially-outer portion of the first radially-extending edge is not in contact with or adjacent the first radially-inner shroud.