An endoscope includes an objective optical system, an illuminator having a light-emitting region and the illuminator disposed at a position different from the objective optical system, and a dome-shaped transparent cover transparent in a range of field of view and sealing the object side of the objective optical system and the illuminator. The following Conditional Expressions (1) and (2) are satisfied: 0.5<θ/ω<0.95 (1), (−0.13×LP+0.86×DR)<DL<0.95×DR (2).

A rear-viewing endoscope includes a rigid section having first and second ends, and a cavity situated between the first and second ends. The rigid section has a longitudinal length and defining a longitudinal axis (LAR). The endoscope further includes a flexible section having proximal and distal ends, where the proximal end is coupled to the second end of the rigid section; and an imaging unit having first and second ends and a cavity situated between the first and second ends, the second end of the imaging unit coupled to the distal end of the flexible section. An objective lens assembly of the endoscope includes a complementary multiband bandpass filter (CMBF) pair situated within the cavity of the imaging unit. The CMBF filter collimated image rays passing therethrough so as to output filtered image rays. A camera or detector receives the filtered image rays and forms corresponding video information for stereoscopic imaging.

In one aspect of the present disclosure, a device may include a shaft having a distal end, and a tip at the distal end of the shaft. The tip may include an opening defined by a surface of the tip. An instrument inserted through the shaft may extend distally out of the opening. The device also may include an elevator for engaging the instrument. The elevator may include a proximal end fixed relative to the surface of the tip, a proximal portion extending distally from the proximal end, and a distal portion extending distally from the proximal portion. A force exerted on the elevator bends the proximal portion to deflect the distal portion without bending of the distal portion.

An endoscope includes a shaft having a distal end, an optical imaging device at the distal end of the shaft for producing a real image of an object observed by means of the endoscope and at least one of an image transfer device for transmitting the real image and an image sensor for capturing the real image. The imaging device has curved light-refracting interfaces, which are tilted in relation to one another.

An optical unit includes: a fixing portion including a front frame portion that holds an object-side fixed lens group, a rear frame portion that holds an image-side fixed lens group or an image sensor, and a fixing portion main body formed by using a non-magnetic material; a moving portion that holds a moving lens group and that is arranged on an inner side of the fixing portion main body so as to be slidable with respect to the fixing portion main body; and a voice coil motor configured to move the moving portion along a direction of the optical axis relative to the fixing portion main body, and including a magnetic portion magnetized in a direction intersecting an optical axis of the object-side fixed lens group, and a coil located on an outer side of the fixing portion main body with respect to the magnetic portion.

The endoscopic device includes a main member having a front slot and a shaft member having a spiral strip selectively running through the slot. The spiral strip is connected to a rotational element whose front end is provided with an optical element. A camera support element is extended from the main member and a camera element is supported by the camera support element. By running the spiral strip through the slot to turn the rotational element and the optical element, a viewing direction of the camera element is altered by the optical element.

A borescope probe for inspecting a side wall of a cavity includes a primary mirror, a main refractive optical group, a stop, and a sensor plane. The primary mirror collects light rays diffused by a surface of the side wall of the cavity according to an inlet angle (α) and reflects the light rays towards the refractive optical group. The main refractive optical group is placed between the primary mirror and the sensor plane and is suitable to receive the light rays reflected by the primary mirror and focus them on the sensor plane.

This endoscope is provided with: a hard part that is provided at the distal end of a scope, is formed in a substantially cylindrical shape, and has a substantially circular distal end surface; and a plurality of cameras that are disposed on the left and right sides of the hard part to be located on both sides of a first virtual line perpendicular to the axis of the hard part on the distal end surface. The plurality of cameras include a first camera. The first camera is disposed so that the imaging axis is offset in the direction along the first virtual line from a second virtual line perpendicular to the axis and the first virtual line.

An endoscope includes a distal end frame disposed at a distal end of an insertion part; an image pickup unit disposed inside the insertion part; an illumination unit disposed inside the insertion part; and an illumination lens disposed on a side opposite to the illumination unit with the distal end frame interposed therebetween. The illumination lens is a plano-convex lens and disposed with a flat surface thereof facing the illumination unit. The illumination unit has an exit surface in which illumination light emerges, and the following Conditional Expression (1) is satisfied:

arcsin(n.sub.L×sin θ.sub.L/n.sub.W)≤arccos((ϕ/2)/R)  (1).

A method of visualizing a body cavity during a surgical procedure including positioning an elongated body of an angled endoscope in a first position within a body cavity of a patient, rotating the elongated body about a longitudinal axis in response to a command point, capturing a plurality of images with an image capture device positioned within the elongated body as the elongated body is rotated, and generating a panoramic view of the body cavity from the plurality of images. In the first position of the elongated body, a surgical site is within a field of view of the image capture device. The field of view of the image capture device capturing a first volume of the body cavity, including the surgical site, when the angled endoscope is in the first position.