Optical waveguide sheath
The illumination system is a cannula comprising a transparent or semi-transparent material capable of carrying light from the proximal end of the cannula to the distal end of the cannula, thereby illuminating a surgical field. The surgical field is thus illuminated through components that do not occupy space that may otherwise be used for optics and or surgical tools. The illumination source may be optically coupled with the cannula at any appropriate location. The cannula comprises a sterilizable polymer which functions as a waveguide. A waveguide is a material medium that confines and guides light. When in use, the light source connected to the hub provides light which may be guided to the distal end of the cannula or any other suitable location. Thus, the sheath provides structure-guided illumination resulting in the illumination of the surgical site.
1. A surgical illumination system comprising:
an illumination source; and
a single generally cylindrical non-fiber optic light waveguide formed of homogeneous material having a distal end, a proximal end, an open bore extending therebetween, a plurality of optical structures adjacent the distal end, and an illumination conduit for conducting light from the illumination source toward the proximal end of the waveguide; and
a light coupling adapter having an elongate body with a proximal end, a distal end, an access channel extending therebetween, and an access port open to the access channel and disposed on a side of the elongate body,
wherein the access channel is coupled to the open bore, and
wherein the access port and the access channel are sized to receive one or more instruments, and
wherein the light coupling adapter conducts light from the illumination source to the illumination conduit of the cylindrical non-fiber optic light waveguide, and
wherein the bore is sized to receive the one or more instruments, and the waveguide conducts the light from the proximal end to the distal end thereof by total internal reflection, and
wherein the plurality of optical structures extract the light from the waveguide and direct the light toward a surgical field.
2. The surgical illumination system of claim 1 , wherein the light coupling adapter comprises a bent tubular waveguide, wherein the elongate body of the light coupling adapter is bent.
3. The surgical illumination system of claim 1 , wherein the plurality of optical structures direct a portion of the conducted light into the bore.
4. The surgical illumination system of claim 1 , wherein the plurality of optical structures comprises a plurality of facets configured to direct light in a selected direction.
5. The surgical illumination system of claim 1 , wherein the plurality of optical structures are distributed over a periphery of the distal end of the non-fiber optic light waveguide such that at least two optical structures are laterally adjacent one another.
6. The surgical illumination system of claim 1 , wherein the single generally cylindrical non-fiber optic light waveguide is uncoated.