Patent ID: 7660616

Claim:
An implantable multi-wavelength oximetry sensor, comprising: an implantable sensor housing defining a window through which light can pass; a first light source, within said sensor housing, to transmit light having a first wavelength; a second light source, within said sensor housing, to transmit light having a second wavelength; and a plurality of prisms within said sensor housing, each prism including a plurality of surfaces; a dichroic surface formed on a first surface of one of said prisms; wherein said dichroic surface reflects light of the first wavelength and passes light of the second wavelength; wherein said first light source is mounted to a second surface of a first one of said prisms directly, or with a first lens therebetween such that said first light source is mounted to one side of said first lens and another side of said first lens is mounted to the second surface of said first one of said prisms; wherein said second light source is mounted to a second surface of a second one of said prisms directly, or with a second lens therebetween such that said second light source is mounted to one side of said second lens and another side of said second lens is mounted to the second surface of said second one of said prisms; and wherein said dichroic surface is angled relative to said first light source and said second light source such that light of the first wavelength transmitted by said first light source is reflected to travel in generally a same direction as light of the second wavelength transmitted by said second light source that passes through said dichroic surface; and wherein said surface on which said dichroic surface is formed is different than both said surface to which said first light source is mounted and said surface to which said second light source is mounted.