Optical bulb for surgical instrument port

1. An apparatus comprising:

a housing having a surface for a user to hold the apparatus;

a shaft that extends from the housing, the shaft including a port body having first and second channels;

an optical bulb disposed at a distal end of the shaft, the optical bulb comprising:

a first body having a substantially hemispherical distal side;

a second body extending from a proximal side of the first body, the second body including a mechanical connection point disposed at or near a proximal side of the second body;

an instrument channel extending from the proximal side of the second body to the substantially hemispherical distal side of the first body, the instrument channel aligned with the first channel in the port body; and

an imaging channel that extends from an aperture defined in the proximal side of the second body, the imaging channel

terminating at a distal end of the imaging channel between the proximal and substantially hemispherical distal sides of the first body,

defining a continuous enclosed space from the aperture defined in the proximal side of the second body to the distal end of the imaging channel, and

aligned with the second channel in the port body, wherein the distal end of the imaging channel is substantially hemispherical,

wherein the first body is configured and arranged to provide a substantially uniform image path within a field of view of a camera disposed in the imaging channel, and

wherein the substantially hemispherical distal end of the imaging channel has a negative power that increases the field of view of the camera.

2. The apparatus of claim 1 , wherein the substantially hemispherical distal end of the imaging channel is configured to refract light passing out of the imaging channel towards the instrument channel.

3. The apparatus of claim 2 , wherein the substantially hemispherical distal end of the imaging channel eliminates a total internal reflection of light at a wall of the instrument channel.

4. The apparatus of claim 3 , wherein a light source for the camera is located outside of the imaging channel.

5. The apparatus of claim 4 , wherein the light source is disposed in a counterbore of the imaging channel.

6. The apparatus of claim 4 , wherein the light source is integrated with the camera.

7. The apparatus of claim 4 , wherein the location of the light source and an inner cross-sectional diameter of the imaging channel are selected to reduce a reflection of light within the imaging channel, the light emitted by the light source.

8. The apparatus of claim 7 , wherein the inner cross-sectional diameter is about 2.5 mm.

9. The apparatus of claim 7 , wherein the light emitted by the light source is substantially uniform distally from the first body within the field of view of the camera.

10. The apparatus of claim 4 , wherein the light source comprises a plurality of light-emitting elements, each light-emitting element disposed along a common virtual circle, wherein the camera is disposed at a center of the common virtual circle.

11. The apparatus of claim 10 , wherein the light-emitting elements comprise light emitting diodes.

12. The apparatus of claim 1 , wherein the first and second bodies comprise a same material.

13. The apparatus of claim 12 , wherein the same material comprises an acrylic thermoplastic.

14. The apparatus of claim 1 , wherein the mechanical connection point comprises a flange.