ENDOSCOPE SYSTEM

1 . An endoscope system comprising:

a light source device that outputs signal light that penetrates tissue within a living body;

a narrow medical instrument that is inserted into a blood vessel and whose distal end has an emission window from which the signal light supplied from the light source device is emitted;

an endoscope that is inserted into the living body and has an imager, which obtains an optical image by acquiring an image of the living body, and a detector, which detects the signal light emitted from the emission window; and

an image processor that generates a composite image by combining the optical image obtained by the imager with a marker that indicates a position of the signal light detected by the detector.

2 . The endoscope system according to claim 1 ,

wherein the light source device outputs near-infrared light or infrared light as the signal light.

3 . The endoscope system according to claim 1 ,

wherein the light source device outputs visible light with a color different from a color of the living body as the signal light.

4 . The endoscope system according to claim 1 ,

wherein the imager obtains the optical image when the signal light is emitted from the emission window and the optical image when the signal light is not emitted from the emission window, and

wherein the image processor generates the marker that indicates a region where a difference between the two optical images obtained by the imager is larger than or equal to a predetermined threshold value.

5 . The endoscope system according to claim 4 ,

wherein the endoscope includes an illuminator that radiates illumination light onto the living body, and

wherein the imager obtains the two optical images in a state where the living body is not irradiated with the illumination light by the illuminator.

6 . The endoscope system according to claim 1 ,

wherein the medical instrument includes a light-guiding member that is disposed therein in a longitudinal direction and whose distal end has the emission window.

7 . The endoscope system according to claim 1 ,

wherein the medical instrument further has a plurality of the emission windows longitudinally arranged in a side surface of the medical instrument.

8 . The endoscope system according to claim 1 ,

wherein the medical instrument further has a plurality of the emission windows circumferentially arranged in a side surface of the medical instrument.

9 . The endoscope system according to claim 6 ,

wherein the medical instrument has light-transmitting sections, which are capable of transmitting the signal light, at multiple positions in the longitudinal direction, and

wherein the light-guiding member is provided in a movable manner in the longitudinal direction of the medical instrument.

10 . The endoscope system according to claim 1 ,

wherein the detector and the imager include a common imaging element that acquires an image of light from the living body.

11 . The endoscope system according to claim 1 , further comprising:

an electrocardiographic signal detector that detects an electrocardiographic signal of the living body,

wherein the detector and the imager respectively perform detection of the signal light and acquisition of the optical image with the same phase of a cycle of the electrocardiographic signal detected by the electrocardiographic signal detector.

12 . The endoscope system according to claim 1 , further comprising:

a notifying unit that provides a notification of an increase in intensity of the signal light detected by the detector.

13 . The endoscope system according to claim 1 ,

wherein the medical instrument is a guide wire, a catheter, or an angioscope.