| 摘要 |
An endoscope (10) is provided at its distal end (11a) with two fixed field lens assemblies (18, 19), one (19) facing generally forward and the other (18) lateral, also with an adjustable control (42, 142, 142 min ) allowing the practitioner to switch, at will between the illuminated surgical or diagnostic site as viewed by one field lens or the other, without removing the endoscope from the patient. |
