A surgical instrument, comprising: (a) an instrument body; (b) a guide shaft distally projecting from the instrument body along a central axis, including: (i) a guide sidewall surrounding the central axis, (ii) a guide lumen defined by the guide sidewall, and (iii) a clearance opening radially extending through the guide sidewall in communication with the guide lumen; and (c) an endoscope, including: (i) an elongate body at least partially positioned within the guide lumen, and (ii) a distal head extending from the elongate body proximate to the clearance opening, wherein the distal head is configured to deflect relative to the elongate body from a first position to a second position, wherein the distal head of the endoscope includes a camera; and (d) a second surgical tool slidably positioned within the guide lumen, the second surgical tool having an enlarged distal portion and a narrowed proximal portion, wherein the distal head in the first position is positioned within the guide lumen along the central axis, wherein the distal head in the second position is deflected from the central axis and extends at least partially through the clearance opening thereby vacating at least a portion of the guide lumen for introducing the second surgical tool through the guide lumen, wherein the enlarged portion is configured to urge the distal head of the endoscope toward the second position upon longitudinal alignment therewith, and wherein the narrowed portion is configured concurrently be positioned alongside the distal head of the endoscope in the first position upon longitudinal alignment therewith. (a) an instrument body; (b) a guide shaft distally projecting from the instrument body along a central axis, including: (i) a guide sidewall surrounding the central axis, (ii) a guide lumen defined by the guide sidewall, and (iii) a clearance opening radially extending through the guide sidewall in communication with the guide lumen; and (i) a guide sidewall surrounding the central axis, (ii) a guide lumen defined by the guide sidewall, and (iii) a clearance opening radially extending through the guide sidewall in communication with the guide lumen; and (c) an endoscope, including: (i) an elongate body at least partially positioned within the guide lumen, and (ii) a distal head extending from the elongate body proximate to the clearance opening, wherein the distal head is configured to deflect relative to the elongate body from a first position to a second position, wherein the distal head of the endoscope includes a camera; and (i) an elongate body at least partially positioned within the guide lumen, and (ii) a distal head extending from the elongate body proximate to the clearance opening, wherein the distal head is configured to deflect relative to the elongate body from a first position to a second position, wherein the distal head of the endoscope includes a camera; and (d) a second surgical tool slidably positioned within the guide lumen, the second surgical tool having an enlarged distal portion and a narrowed proximal portion, wherein the distal head in the first position is positioned within the guide lumen along the central axis, wherein the distal head in the second position is deflected from the central axis and extends at least partially through the clearance opening thereby vacating at least a portion of the guide lumen for introducing the second surgical tool through the guide lumen, wherein the enlarged portion is configured to urge the distal head of the endoscope toward the second position upon longitudinal alignment therewith, and wherein the narrowed portion is configured concurrently be positioned alongside the distal head of the endoscope in the first position upon longitudinal alignment therewith. wherein the distal head in the first position is positioned within the guide lumen along the central axis, wherein the distal head in the second position is deflected from the central axis and extends at least partially through the clearance opening thereby vacating at least a portion of the guide lumen for introducing the second surgical tool through the guide lumen, wherein the enlarged portion is configured to urge the distal head of the endoscope toward the second position upon longitudinal alignment therewith, and wherein the narrowed portion is configured concurrently be positioned alongside the distal head of the endoscope in the first position upon longitudinal alignment therewith.