Olympus Corporation

Keiichiro Nakajima

Mitsuru Namiki

Masashi Yamada

Hiroki Hibino

Takamitsu Sakamoto

Atsuyoshi Shimamoto

Mikihiko Terashima

Takehiro Miki

Yu Kondo

Yoko Okabe

Provided is an objective optical system including: a first spherical lens and a second spherical lens that are arrayed in this order from an object; and at least one of a first optical medium and a second optical medium, wherein the first optical medium is a solid or liquid disposed at an object side of the first spherical lens and is in close contact with a surface on the object side of the first spherical lens, over an entire optical path; and the second optical medium is a solid or liquid disposed at an opposite side of the second spherical lens from the object and is in close contact with a surface on the opposite side of the second spherical lens from the object, over the entire optical path.

Objective optical system

An optical-scanning-type observation probe is provided with: an imaging optical system that illumination light scanned by an optical scanner enters and that focuses the illumination light in the form of a spot, multiple times; a projection optical system that emits illumination light coming from a focus position focused by the imaging optical system, toward a subject in the form of a spot; and a light-receiver that is provided independently of the imaging optical system and the projection optical system and that receives reflected light of the illumination light, the reflected light coming from the subject, via a light path different from that of the imaging optical system and the projection optical system.

Optical-scanning-type observation probe and optical-scanning-type observation device

The disclosed technology is directed to a light detecting apparatus used in an image acquiring apparatus. The image acquiring apparatus comprises a light receiving element that outputs a current according to a light amount of incident light. A current-voltage conversion circuit converts the current output from the light receiving element to a voltage signal. The current-voltage conversion circuit includes an operational amplifier and feedback resistance, feedback capacitance, and at least one diode that are connected in parallel between an inverting terminal and an output terminal of the operational amplifier. The diode is connected to have a forward direction from the inverting terminal toward the output terminal, and following conditional expressions are satisfied, G=RB=1/(2&#x3c0;R(C+C/n)) and V&#x3e;n&#xd7;V&#x3e;G&#xd7;I.

Light detecting apparatus and image acquiring apparatus

The disclosed optical scanning endoscope apparatus includes a scanner that scans an object with illumination light from a light source, a light amount detector that detects a light amount of the illumination light from the light source, and a controller that controls output of the light source based on the light amount detected by the light amount detector. The controller controls the output of the light source based on an integral value of the light amount detected by the light amount detector during an immediately prior predetermined period.

Optical scanning endoscope apparatus with light amount detector

Provided is a scanning endoscope system including: an illumination-light emitting portion that is inserted into a body of a patient and that emits illumination light emitted from a light-source portion toward an imaging subject in the body in a spot-like manner; a light scanner that scans the illumination light on the imaging subject; and a light detector that is disposed at a body surface of the patient, and that detects reflected light coming from the scanning position in the imaging subject, at which the illumination light is scanned by the light scanner.

Scanning endoscope system

Provided is a cardiac-event processor () including a storing unit () that stores a time history of cardiac events, including heartbeats, in association with the presence/absence of nerve stimulation; a heart rate calculator () that calculates a heart rate for when each heartbeat is detected, on the basis of the time history of the cardiac events stored in the storing unit (); and a frequency data generator () that separately adds up frequencies of the heart rates calculated by the heart rate calculator () for the cases with and without the nerve stimulation.

Cardiac-event processor and heart treatment device

A nerve stimulation apparatus performs nerve stimulation of a required level while reducing the adverse effect on the heart and on the detection of a cardiac event. Provided is a nerve stimulation apparatus that includes a stimulation signal output unit that outputs a nerve stimulation signal; a cardiac event detector that detects a cardiac event; and a controller that controls the stimulation signal output unit so as to output a nerve stimulation signal having a smaller intensity in a non-refractory period than that in a cardiac refractory period that is obtained on the basis of the cardiac event detected by the cardiac event detector.

Nerve stimulation apparatus

Provided is a nerve stimulation apparatus that is capable of performing effective nerve stimulation depending on a therapeutic purpose without adversely affecting a heart. Further provided is a nerve stimulation apparatus including: a stimulation-pulse output unit that outputs a stimulation pulse; a cardiac-event detector that detects a cardiac event; and a controller that controls the stimulation-signal output unit so as to output, during a cardiac refractory period, the nerve stimulation signal having an intensity that corresponds to the heart rate obtained on the basis of the cardiac event detected by the cardiac-event detector.

Growing community of inventors

Tokyo, Japan

Keiichiro Nakajima