referring to fig1 and 2 , a camera 13 is mounted on an eyepiece section 12 of an endoscope 11 , and a connector 15 at the end of a universal cord 14 is connected to a light supply unit 16 . an electrosurgical device ( electric bistoury device ) 17 has an active electrode terminal 18 which is connected through a cord 19 to an electrosurgical instrument 20 . the electrosurgical instrument 20 is inserted through a forceps channel of the endoscope 11 and is provided at the tip with an active electrode 21 for clamping the tissue 22 . a patient electrode 23 is connected through a cord 24 to a patient electrode terminal 25 . a foot switch 26 is connected to the electrosurgical device 17 for on - off controlling the electrosurgical device 17 . as shown in fig2 the endoscope 11 is provided with an image guide 27 and a light guide 28 . in the camera 13 , a beam splitter 29 , a shutter 30 and a film 31 are provided in the mentioned order to face an eyepiece lens 12a of the eyepiece section 12 of the endoscope 11 . a light receiving element ( photodiode ) 32 is provided on one side of the beam splitter 29 . the photodiode 32 is connected to an automatic exposure calculating circuit 33 . the automatic exposure calculating circuit 33 is a usual exposure calculating circuit for calculating exposure according to the output of the photodiode 32 in response to the closure of a release switch 34 . the automatic exposure calculating circuit 33 has a release signal output terminal and a flash terminate signal output terminal . these terminals are connected through respective transmission lines 35 and 36 of the endoscope 11 to a light source circuit 37 of the light supply unit 16 . the light source circuit 37 is connected to an observation light source ( e . g . halogen lamp ) 38 and a photographing light source ( e . g . electronic flash lamp ) 39 for on - off controlling these lamps . the light paths of the lamps 38 and 39 with respect to the light guide 28 are switched by a usual switching system using a light path switching mirror 40 . the camera 13 is provided with a switch 41 which is interlocked to the release switch 34 . the switch 41 is connected through the transmission line 42 of the endoscope 11 , signal line 43 of the light supply unit 16 and cord 44 to an interval timer 45 of the electrosurgical device 17 . the output terminal of the timer 45 is connected to one of the input terminals of a nor gate 46 . the other input terminal of the nor gate 46 is connected through a resistor 47 to a power supply vcc and is also connected to a foot switch 26 . the output terminal of the nor gate 46 is connected to a trigger input terminal of a high frequency current generator 48 . in the above construction , when the switch 41 and foot switch 26 are &# 34 ; off &# 34 ;, the output of the timer 45 is at an l ( low ) level , and thus the input terminals of the nor gate 46 are respectively at h ( high ) and l levels so that the output of the nor gate 46 is at l level . when the output of the nor gate 46 is at the l level , the high frequency current generator 48 is inoperative . when the foot switch 26 is closed in this state , both the input terminals of the nor gate 46 come up with the l level , so that the nor gate 46 provides an h level signal . with the appearance of the h level signal from the nor gate 46 , the high frequency current generator 48 is triggered to provide high frequency current . this high frequency current is led through the cords 19 and 24 to the active electrode 21 and patient electrode 23 to burn the patient &# 39 ; s tissue 22 . when the release button 34a ( fig1 ) is depressed during this burning treatment for taking a picture of the patient &# 39 ; s tissue 22 , the release switch 34 and interlock switch 41 are closed . as a result , the automatic exposure calculating circuit 33 generates a release signal , which is fed through the transmission line 35 to the light source circuit 37 . also , the switch 41 provides an interrupt signal which is fed through the transmission line 42 , signal line 43 and cord 44 to the timer 45 of the electro - surgical device 17 . in response to the interrupt signal , the timer 45 supplies an h level signal to the nor gate 46 . as a result , the output of the nor gate 46 goes to the l level , whereupon the generation of the high frequency current from the high frequency current generator 48 is stopped . at this time , the light source circuit 37 starts a photographing operation in response to the release signal . in the photographing operation , the shutter 30 of the camera 13 is released and the light path switching mirror 40 is turned upright . the flash tube 39 is caused to emit flashlight at an instant when the shutter 30 is fully released . the flashlight from the flash tube 39 is transmitted through the light guide 28 to the patient &# 39 ; s tissue 22 to illuminate the tissue . when the reflected light from the tissue is incident through the image guide 27 to the beam splitter 32 , the photodiode 32 generates a photoelectric output corresponding to the reflected light received . with the photoelectric output supplied to the automatic exposure calculating circuit 33 , the exposure period calculation is started . when a proper exposure period is obtained , the automatic exposure calculating circuit 33 generates a flash terminate signal . this flash terminate signal is transmitted through the transmission line 36 to the light source circuit 37 . the light source circuit 37 stops the flashlight emission of the flash tube 39 in response to the flash terminate signal . subsequently , the camera shutter 30 is closed , and the light path switching mirror 40 is restored to the initial position . also , the release switch 34 and switch 41 are both opened at this time . this brings an end to one cycle of the photographing operation . the timer 45 of the electrosurgical device 17 provides the h level signal for a period required for the aforementioned one cycle of photographing operation . the timer 45 of the electrosurgical device 17 provides the h level signal for a period required for the aforementioned one cycle of photographing operation , for instance 250 msec ., and changes the output to the l level at the instant of the end of the photographing operation . when the output of the timer 45 is changed to the l level , the high frequency current generator 48 again produces the high frequency current to resume the burning treatment . when the foot switch 26 is opened after the end of the burning treatment of the patient &# 39 ; s tissue 22 , the output of the nor gate 46 is changed to the l level , whereupon the high frequency current generator 48 stops the generation of high frequency current . it is to be understood that when the photographing operation is started while the patient &# 39 ; s tissue is being treated by the electrosurgical device , i . e ., while the high frequency current is being generated , the generation of the high frequency current is interrupted only during the photographing operation , so that it is possible to obtain proper photographing without the photographing signal such as the release signal being influenced by any noise component of high frequency current . the period of interruption of the electrosurgical device is about 250 msec ., i . e ., about 0 . 25 sec ., which is considerably short compared to one output cycle period of the electrosurgical device , i . e ., about 5 sec ., so that the aforementioned interruption of the electrosurgical operation has no substantial adverse effect upon the operation . the switch 41 in the above embodiment may be served by the release switch 34 as well , or it may be served by an x contact of the camera 13 , an fp contact or other synchro - contacts . further , the switch 41 may be replaced with a flash start signal from the light source circuit 37 . further , the timer 45 , nor gate 46 and resistor 47 may be provided in the foot switch 26 or light supply circuit 16 . further , as the signal for interrupting the operation of the electrosurgical device a light signal or a supersonic signal may be used , and as the signal line an optical fiber or a supersonic wave guide medium may be used . now , a different embodiment will be described with reference to fig3 . in this embodiment , an adapter 50 is mounted between connector 15 and light supply circuit 16 . the adapter 50 includes a flip - flop 51 , with the set terminal s0 thereof connected to release signal transmission line 35 and the reset terminal r0 connected to flash terminate signal transmission line 36 . the output terminal q of the flip - flop 51 is connected to a first input terminal of a nor gate 52 . a second input terminal of the nor gate 52 is connected to the foot switch 26 and is also connected through a resistor 53 to a power supply vcc . in this embodiment , while the electrosurgical device 17 is in operation caused with the closure of the foot switch 26 , but the first and second input terminals of the nor gate 52 are held at the l level , and the output of the nor gate 52 is at the h level . when the release switch 34 is closed in this state , the automatic exposure calculating circuit 33 and light source circuit 37 are rendered operative , whereby an l level pulse signal is transmitted through the release signal transmission line 35 to the light source circuit 37 to render the photographing light source operative . the pulse signal is also supplied to the set terminal s0 of the flip - flop 51 , and the output of the flip - flop 51 is changed to the h level as shown in the time chart of fig4 . in response to this h level signal the output of the nor gate 52 is changed to the l level , whereupon the operation of the electrosurgical device 17 is stopped . when the exposure in the photographing operation is completed , the l level pulse signal , i . e ., flash terminate signal , is transmitted through the signal line 36 to the light source circuit 37 , and it is also supplied to the reset terminal r0 of the flip - flop 51 . as a result , the output of the flip - flop 51 is changed to the l level to change the output of the nor gate 52 to the l level . thus , the electrosurgical device 17 is driven again . with the above embodiment , which incorporates the adapter 50 , the aim of the invention can be achieved without modifying the endoscope , camera , light source unit or foot switch . the adapter may be provided in the camera , light source unit or endoscope . further , the release signal and flash terminate signal may be replaced with a multiplex signal , or the signal lines may be replaced with a common line . further , it is possible to transmit an encoded signal . as has been described in the foregoing , according to the invention the operation of the electrosurgical operation is interrupted at least during the period of the photographing operation , so that satisfactory photographing can be obtained without the photographing signal being influenced by any noise component generated from the electrosurgical device . further , where a single lens reflex is used as the camera , the endoscopic observation is impossible during photographing , but since the electrosurgical device is held inoperative during this photographing period , the photographing can be safely carried out even though the endoscopic observation cannot be made . while the above embodiment have concerned with electrosurgical devices , the invention is also applicable to other medical electronic devices where noise component is generated such as laser surgical devices and supersonic devices .
an endoscope and an electrosurgical device are assembled such that when endoscopic operation is started during electrosurgical operation conducted with the output of the electrosurgical device , the output of the electrosurgical device is interrupted until the photographing is ended .