A visualization instrument comprising a display device, a lens, a camera including an imaging sensor and outputting a digital image stream corresponding to a plurality of views obtained through the lens, and a self-contained energy source powering the display device and the camera, the visualization instrument further including: - an insertable portion insertable into a patient, the insertable portion having a distal cavity at a distal end thereof defined by an anterior wall, a posterior wall opposite the anterior wall, a medial wall, and a lateral wall opposite the medial wall, the distal cavity having a distal opening through which the plurality of views are obtained, the anterior wall extending from the medial wall to form, together with the medial wall, a guide pathway for inserting a tube into the patient, the medial wall and the anterior wall being non-resilient walls, the distal cavity and the guide pathway arranged laterally to each other to reduce the anterior/posterior height of the insertable portion; and - a handle portion having a proximal end and a distal end, the handle portion defining a cavity at its proximal end, the handle portion sized to be held by a hand of a user; characterized in that - the handle portion and the insertable portion are integrally formed as a single piece blade; and - the visualization instrument further includes a display support non-removably coupled to, and supporting the display device, the display support being detachably insertable into the cavity of the handle portion to detachably couple the display device to the insertable portion, wherein coupling the display device to the insertable portion electronically couples the camera to the display device to present images corresponding to the plurality of views with the display device. - an insertable portion insertable into a patient, the insertable portion having a distal cavity at a distal end thereof defined by an anterior wall, a posterior wall opposite the anterior wall, a medial wall, and a lateral wall opposite the medial wall, the distal cavity having a distal opening through which the plurality of views are obtained, the anterior wall extending from the medial wall to form, together with the medial wall, a guide pathway for inserting a tube into the patient, the medial wall and the anterior wall being non-resilient walls, the distal cavity and the guide pathway arranged laterally to each other to reduce the anterior/posterior height of the insertable portion; and - a handle portion having a proximal end and a distal end, the handle portion defining a cavity at its proximal end, the handle portion sized to be held by a hand of a user; - the handle portion and the insertable portion are integrally formed as a single piece blade; and - the visualization instrument further includes a display support non-removably coupled to, and supporting the display device, the display support being detachably insertable into the cavity of the handle portion to detachably couple the display device to the insertable portion, wherein coupling the display device to the insertable portion electronically couples the camera to the display device to present images corresponding to the plurality of views with the display device.