JPWO2016117373A1 - Medical equipment and endoscope system - Google Patents

Abstract

The medical device according to the present invention is two circuits that are electrically insulated from each other, and has one circuit having a first reference potential and a second reference potential different from the first reference potential. A medical device that performs signal transmission with the other circuit having the attenuation unit that is provided on one circuit side and attenuates the amplitude of the received signal, while maintaining insulation between the one and the other circuit And a pulse transformer that transmits the signal attenuated by the attenuation unit from one circuit to the other circuit.

Description

  The present invention relates to a medical device that performs signal transmission between electrically insulated circuits.

  Conventionally, in the medical field, an endoscope system is used when observing an organ of a subject such as a patient. An endoscope system is provided with an imaging device, for example, provided with an imaging device at a distal end and having an insertion portion inserted into a subject and a proximal end side of the insertion portion via a cable. And a processing device that performs in-vivo image processing according to the imaging signal and displays the in-vivo image on a display unit or the like.

  An endoscope system is a circuit that transmits and receives signals between a patient circuit that is in contact with a subject and a patient circuit, and is grounded to ensure the safety of the operator. A secondary circuit that is a circuit that has been configured. Thus, in the endoscope system, the patient circuit and the secondary circuit are electrically insulated in order to ensure safety.

  As a technique for performing signal transmission between a patient circuit and a secondary circuit, a pulse transformer (isolator) is provided between the patient circuit and the secondary circuit, and the patient circuit and the secondary circuit are connected via the pulse transformer. An endoscope system that secures a transmission path is disclosed (see, for example, Patent Document 1).

JP 2007-167590 A

  When a pulse transformer is used for signal transmission between a patient circuit and a secondary circuit, a filter or the like has been used as an electromagnetic compatibility (EMC) countermeasure. However, when a filter is used, there is a problem that the amplitude of the signal transmitted by the pulse transformer is reduced and the waveform quality is lowered.

  This invention is made in view of the above, Comprising: It aims at providing the medical device which can maintain EMC and waveform quality, even when transmitting a signal using a pulse transformer.

  In order to solve the above-described problems and achieve the object, a medical device according to the present invention includes two circuits that are electrically insulated from each other, one circuit having a first reference potential, A medical device that performs signal transmission with another circuit having a second reference potential different from the first reference potential, and is provided on the one circuit side to attenuate the amplitude of the received signal And a pulse transformer that transmits the signal attenuated by the attenuation unit from the one circuit to the other circuit while maintaining insulation between the one circuit and the other circuit. .

  The medical device according to the present invention may further include an amplification unit that is provided on the other circuit side and that amplifies the amplitude of the signal that is attenuated by the attenuation unit transmitted by the pulse transformer. Features.

  In the medical device according to the present invention, the amplification factor of the amplitude of the amplification unit is a reciprocal of the attenuation factor of the amplitude of the attenuation unit.

  In the medical device according to the present invention as set forth in the invention described above, the pulse transformer transmits a differential signal.

  Further, the medical device according to the present invention is the medical device according to the above-mentioned invention, provided on the other circuit side and maintaining the insulation between the one and the other circuit, and the second attenuation unit that attenuates the amplitude of the received signal. And a second pulse transformer for transmitting the signal attenuated by the second attenuation unit from the other circuit to the one circuit.

  According to the present invention, there is an effect that EMC and waveform quality can be maintained even when a signal is transmitted using a pulse transformer.

FIG. 1 is a diagram illustrating a schematic configuration of an endoscope system according to the first embodiment of the present invention. FIG. 2 is a block diagram illustrating a schematic configuration of the endoscope system according to the first embodiment of the present invention. FIG. 3 is a block diagram illustrating a schematic configuration of the insulating transmission unit of the endoscope system according to the first embodiment of the present invention. FIG. 4 is a block diagram illustrating a configuration of a main part of the insulated transmission unit of the endoscope system according to the second embodiment of the present invention. FIG. 5 is a block diagram illustrating a configuration of a main part of the insulated transmission unit of the endoscope system according to the third embodiment of the present invention. FIG. 6 is a block diagram illustrating a schematic configuration of the insulating transmission unit of the endoscope system according to the fourth embodiment of the present invention.

  Hereinafter, modes for carrying out the present invention (hereinafter referred to as “embodiments”) will be described. In the embodiment, as an example of a system including a medical device according to the present invention, a medical endoscope system that captures and displays an image in a subject such as a patient will be described. Moreover, this invention is not limited by this embodiment. Furthermore, in the description of the drawings, the same portions will be described with the same reference numerals.

(Embodiment 1)
FIG. 1 is a diagram illustrating a schematic configuration of an endoscope system according to the first embodiment of the present invention. FIG. 2 is a block diagram illustrating a schematic configuration of the endoscope system according to the first embodiment.

  An endoscope system 1 shown in FIGS. 1 and 2 includes an endoscope 2 that captures an in-vivo image of a subject by inserting a tip portion into the subject, and illumination light emitted from the tip of the endoscope 2. , A processing device 4 that performs predetermined signal processing on the image signal captured by the endoscope 2, and controls the overall operation of the endoscope system 1, and signals from the processing device 4 A display device 5 that displays an in-vivo image generated by the processing, and a recording device 6 that records data including various programs for operating the endoscope system 1, various parameters, and the like.

  The endoscope 2 includes an insertion portion 21 having an elongated shape having flexibility, an operation portion 22 that is connected to a proximal end side of the insertion portion 21 and receives input of various operation signals, and an insertion portion from the operation portion 22. And a universal cord 23 that includes various cables that extend in a direction different from the direction in which 21 extends and connect to the light source device 3 and the processing device 4.

  The insertion unit 21 receives a light and performs photoelectric conversion to generate a signal to generate a signal. The insertion unit 21 includes an image pickup element 244 in which pixels are arranged in a two-dimensional shape, and a bendable portion formed by a plurality of bending pieces. And a long flexible tube portion 26 connected to the proximal end side of the bending portion 25 and having flexibility.

  The distal end portion 24 is configured using a glass fiber or the like, and forms a light guide path for light emitted from the light source device 3. An illumination lens 242 provided at the distal end of the light guide 241. And an image sensor 244 that is provided at an image forming position of the optical system 243, receives light collected by the optical system 243, photoelectrically converts the light into an electrical signal, and performs predetermined signal processing.

  The optical system 243 is configured using one or a plurality of lenses, and has an optical zoom function for changing the angle of view and a focus function for changing the focus.

  The image sensor 244 photoelectrically converts light from the optical system 243 to generate an electrical signal (image signal). Specifically, in the imaging element 244, a plurality of pixels each having a photodiode that accumulates electric charge according to the amount of light, a capacitor that converts electric charge transferred from the photodiode into a voltage level, and the like are arranged in a matrix, A light receiving unit 244a in which each pixel photoelectrically converts light from the optical system 243 to generate an electric signal, and an electric signal generated by a pixel arbitrarily set as a reading target among a plurality of pixels of the light receiving unit 244a is sequentially read out And a reading unit 244b for outputting as an imaging signal. The image sensor 244 controls various operations of the distal end portion 24 in accordance with the drive signal received from the processing device 4. The image sensor 244 is realized by using, for example, a charge coupled device (CCD) image sensor or a complementary metal oxide semiconductor (CMOS) image sensor.

  The operation unit 22 includes a bending knob 221 that bends the bending unit 25 in the vertical direction and the left-right direction, and a treatment tool insertion unit 222 that inserts a treatment tool such as a biopsy forceps, an electric knife, and an inspection probe into the body cavity of the subject. In addition to the processing device 4 and the light source device 3, it has a plurality of switches 223 that are operation input units for inputting operation instruction signals of peripheral devices such as air supply means, water supply means, and screen display control. The treatment tool inserted from the treatment tool insertion portion 222 is exposed from the opening (not shown) via the treatment tool channel (not shown) of the distal end portion 24.

  The universal cord 23 includes at least a light guide 241 and a collective cable 245 in which one or a plurality of signal lines are collected. The collective cable 245 is a signal line for transmitting an image signal, a signal line for transmitting a drive signal for driving the image sensor 244, and endoscope-specific information regarding the endoscope 2 (image sensor 244). Including a signal line for transmitting and receiving unique information including.

  Next, the configuration of the light source device 3 will be described. The light source device 3 includes an illumination unit 31 and an illumination control unit 32. Under the control of the illumination control unit 32, the illumination unit 31 sequentially switches and emits illumination light with different exposure amounts to the subject (subject). The illumination unit 31 includes a light source 31a and a light source driver 31b.

  The light source 31a is configured using an LED light source that emits white light, one or a plurality of lenses, and the like, and emits light (illumination light) by driving the LED light source. The illumination light generated by the light source 31a is emitted from the tip of the tip portion 24 toward the subject via the light guide 241. The light source 31a is configured by using a red LED light source, a green LED light source, and a blue LED light source, and emits light from any one of the light sources, so that any wavelength of red light, green light, and blue light is emitted. Light having a band may be emitted as illumination light.

  The light source driver 31b causes the light source 31a to emit illumination light by supplying current to the light source 31a under the control of the illumination control unit 32.

  The illumination control unit 32 controls the amount of power supplied to the light source 31a and the drive timing of the light source 31a based on the control signal from the processing device 4.

  Next, the configuration of the processing device 4 will be described. The processing device 4 includes a first signal processing unit 41, an insulating transmission unit 42 (medical device), a second signal processing unit 43, an input unit 44, and a control unit 45. In the first embodiment, the processing device 4 includes a patient circuit 4a having a first signal processing unit 41, a second signal processing unit 43, an input unit 44, and a secondary circuit 4b having a control unit 45. It is comprised by the insulated transmission part 42 which performs signal transmission between the patient circuit 4a and the secondary circuit 4b, and the patient circuit 4a and the secondary circuit 4b are mutually insulated electrically. The patient circuit 4a is connected to a first reference potential point, and the secondary circuit 4b is connected to a second reference potential point different from the first reference potential point.

  The secondary circuit 4b is a circuit that is grounded by, for example, functional grounding for stably operating the circuit, protective grounding for ensuring the safety of the operator of the endoscope system 1, and the like. On the other hand, the patient circuit 4a is a circuit insulated from the secondary circuit 4b, and is a circuit grounded at a reference potential different from the reference potential of the secondary circuit 4b.

  The first signal processing unit 41 outputs a digitized imaging signal (pulse signal) to the insulating transmission unit 42 by performing noise removal and A / D conversion on the imaging signal output by the imaging element 244. Further, the first signal processing unit 41 receives a drive signal including control information data for imaging control transmitted from the control unit 45 via the insulating transmission unit 42, and sends the received drive signal to the image sensor 244. Output.

  The insulating transmission unit 42 performs signal transmission between the patient circuit 4a and the secondary circuit 4b. Specifically, the insulating transmission unit 42 performs the second signal processing on the imaging signal subjected to the signal processing by the first signal processing unit 41 while maintaining the insulation between the patient circuit 4a and the secondary circuit 4b. While transmitting to the part 43 side, the drive signal output from the 2nd signal processing part 43 is transmitted to the 1st signal processing part 41 side.

  The second signal processing unit 43 generates an image signal for display displayed on the display device 5 based on the imaging signal input from the first signal processing unit 41. The second signal processing unit 43 performs predetermined signal processing on the imaging signal to generate a display image signal including an in-vivo image. Here, as image processing, synchronization processing (for example, performed when an imaging signal is obtained using a color filter or the like), optical black subtraction processing, white balance adjustment processing, color matrix calculation processing, gamma correction processing, Examples include color reproduction processing, edge enhancement processing, and format conversion processing. The second signal processing unit 43 outputs the generated image signal to the display device 5.

  The input unit 44 receives input of various signals such as an operation instruction signal that instructs the operation of the endoscope system 1.

  The control unit 45 is configured by using a CPU or the like, and performs drive control of each component including the image sensor 244 and the light source device 3 and input / output control of information with respect to each component. The control unit 45 generates a drive signal with reference to control information data (for example, read timing) for imaging control recorded in the recording device 6, and includes the generated drive signal in the collective cable 245. And transmitted to the image sensor 244 via a predetermined signal line.

  Next, the display device 5 will be described. The display device 5 receives and displays the in-vivo image corresponding to the video signal generated by the processing device 4 via the video cable. The display device 5 is configured using a monitor such as liquid crystal or organic EL (Electro Luminescence).

  Next, the recording device 6 will be described. The recording device 6 is realized using a semiconductor memory such as a flash memory or a DRAM (Dynamic Random Access Memory). The recording device 6 records various programs for operating the endoscope system 1 and data including various parameters necessary for the operation of the endoscope system 1. The recording device 6 records the identification information of the processing device 4. Here, the identification information includes unique information (ID) of the processing device 4, model year, specification information, and the like.

  Next, transmission processing by the insulating transmission unit 42 of the endoscope system 1 will be described with reference to FIG. FIG. 3 is a block diagram illustrating a schematic configuration of the insulating transmission unit of the endoscope system according to the first embodiment. The insulating transmission unit 42 includes an imaging signal transmission unit 401, an attenuation unit 402, a first pulse transformer 403, an imaging signal reception unit 404, a drive signal transmission unit 411, a second pulse transformer 412, and a drive signal reception unit. 413.

  The imaging signal transmission unit 401 is provided on the patient circuit 4 a side, receives an imaging signal subjected to signal processing by the first signal processing unit 41, and transmits the received imaging signal to the attenuation unit 402.

  The attenuation unit 402 is provided on the patient circuit 4a side, and performs an attenuation process on the imaging signal transmitted from the imaging signal transmission unit 401. Specifically, the attenuation unit 402 performs an attenuation process for reducing the amplitude of the imaging signal, and outputs the imaging signal after the attenuation process to the first pulse transformer 403. For example, the attenuation unit 402 performs an attenuation process for reducing the amplitude by half with respect to the received imaging signal. In the first embodiment, it is assumed that the attenuation factor is 1/2 as described above. However, the attenuation factor can be arbitrarily set according to the transmission path, the path length, and the information included in the signal to be transmitted. It is.

  The first pulse transformer 403 is provided between the patient circuit 4 a and the secondary circuit 4 b, and outputs the imaging signal (pulse signal) attenuated by the attenuation unit 402 to the imaging signal reception unit 404. The first pulse transformer 403 includes a primary winding and a secondary winding on a magnetic core, transmits a pulse signal, and includes a patient circuit 4a and a secondary circuit 4b by the primary winding and the secondary winding. And is insulated.

  The imaging signal receiving unit 404 is provided on the secondary circuit 4 b side, receives the imaging signal output by the first pulse transformer 403, and transmits the received imaging signal to the second signal processing unit 43.

  The drive signal transmission unit 411 is provided on the secondary circuit 4 b side, receives a drive signal from the control unit 45, and transmits the received drive signal to the second pulse transformer 412.

  The second pulse transformer 412 is provided between the patient circuit 4a and the secondary circuit 4b, and outputs the drive signal (pulse signal) output from the drive signal transmission unit 411 to the drive signal reception unit 413. Similar to the first pulse transformer 403, the second pulse transformer 412 is formed by applying a primary winding and a secondary winding to a magnetic core, transmits a pulse signal, and uses a primary winding and a secondary winding. The patient circuit 4a and the secondary circuit 4b are insulated.

  The drive signal receiving unit 413 is provided on the patient circuit 4 a side, receives the drive signal output by the second pulse transformer 412, and transmits the received drive signal to the first signal processing unit 41.

  In the insulating transmission unit 42, when the imaging signal generated by the imaging device 244 is received from the first signal processing unit 41, the attenuation unit 402 performs an attenuation process to reduce the amplitude, and the first pulse transformer 403 and the patient circuit 4 a are secondary. While maintaining insulation from the circuit 4b, the attenuated imaging signal is transmitted from the patient circuit 4a side to the secondary circuit 4b side. In consideration of the waveform quality such as the S / N ratio, the signal amplitude proportional to the radiation noise is lowered to suppress the radiation noise, and the insulation is maintained while maintaining the waveform quality such as the S / N ratio. Signal transmission between circuits can be performed.

  According to the first embodiment described above, in the isolated transmission unit 42, the attenuation unit 402 performs an attenuation process for reducing the amplitude of the received imaging signal, and then the patient circuit 4a is connected to the patient circuit 4a by the first pulse transformer 403. Since the attenuated imaging signal is transmitted from the patient circuit 4a side to the secondary circuit 4b side while maintaining insulation from the secondary circuit 4b, the signal is transmitted using the pulse transformer (first pulse transformer 403). Even when transmitting, EMC and waveform quality can be maintained.

(Embodiment 2)
Next, a second embodiment of the present invention will be described. FIG. 4 is a block diagram illustrating a configuration of a main part of the insulating transmission unit of the endoscope system according to the second embodiment. In addition, the same code | symbol is attached | subjected and demonstrated to the structure same as the structure mentioned above. In the first embodiment described above, the imaging signal before being input to the first pulse transformer 403 is attenuated, and the imaging signal receiving unit 404 receives the attenuated imaging signal. However, in the second embodiment, An amplification unit 405 is provided in front of the imaging signal receiving unit 404 to amplify (restore) the attenuated imaging signal.

  The insulated transmission unit 42 according to the second embodiment includes the above-described imaging signal transmission unit 401, attenuation unit 402, first pulse transformer 403, imaging signal reception unit 404, drive signal transmission unit 411, second pulse transformer 412, and driving. A signal receiving unit 413 and an amplifying unit 405 are provided. In FIG. 4, only the configuration on the imaging signal transmission side is illustrated.

  The amplifying unit 405 is provided between the first pulse transformer 403 and the imaging signal receiving unit 404, receives the attenuated imaging signal output from the first pulse transformer 403, and performs a predetermined amplification process. The imaging signal after the amplification processing is output to the imaging signal receiving unit 404. Specifically, when the amplifying unit 405 receives an imaging signal whose amplitude has been reduced to half by the attenuating unit 402, the amplifying unit 405 amplifies the imaging signal by a factor of 2 to restore the imaging signal having the amplitude before attenuation.

  Thereby, the imaging signal receiving unit 404 receives the imaging signal having the amplitude before attenuation, and the restored imaging signal is used in the signal processing of the second signal processing unit 43 thereafter.

  According to the second embodiment described above, after the attenuation unit 402 performs attenuation processing for reducing the amplitude of the received imaging signal, the first pulse transformer 403 isolates the patient circuit 4a from the secondary circuit 4b. The attenuation-processed imaging signal is transmitted from the patient circuit 4a side to the secondary circuit 4b side, and the amplifying unit 405 provided on the secondary circuit 4b side amplifies (restores) the attenuated imaging signal. Thus, even when a signal is transmitted using a pulse transformer (first pulse transformer 403), EMC and waveform quality can be maintained.

  In the second embodiment described above, when an imaging signal whose amplitude has been reduced by half is received by the attenuation unit 402, it has been described as being amplified twice and restored to the imaging signal having the amplitude before attenuation. In addition to multiplying the reciprocal of the attenuation factor as an amplification factor, the amplitude may be amplified by multiplying by an arbitrary coefficient (amplification factor) other than double.

(Embodiment 3)
Next, a third embodiment of the present invention will be described. FIG. 5 is a block diagram illustrating a configuration of a main part of the insulated transmission unit of the endoscope system according to the third embodiment. In addition, the same code | symbol is attached | subjected and demonstrated to the structure same as the structure mentioned above. In the first and second embodiments described above, transmission of a single-end signal in which one signal is transmitted through one signal line has been described as an example. In the third embodiment, two signal lines (differential signals) are transmitted. A differential transmission method in which one signal is transmitted using a wire). As this differential transmission method, for example, an LVDS (Low voltage differential signaling) method is applicable.

  The insulated transmission unit 42 according to the third embodiment includes the drive signal transmission unit 411, the second pulse transformer 412, the drive signal reception unit 413, the imaging signal transmission unit 401a, the attenuation unit 402a, and the first pulse transformer. 403a, an imaging signal reception unit 404a, and an amplification unit 405a. In FIG. 5, only the configuration on the imaging signal transmission side is illustrated.

  The imaging signal transmission unit 401a is provided on the patient circuit 4a side, receives the imaging signal subjected to signal processing by the first signal processing unit 41, and transmits the received imaging signal to the attenuation unit 402a. In the third embodiment, the imaging signal that has been subjected to signal processing by the first signal processing unit 41 is a single-ended signal, and the imaging signal transmission unit 401a converts the single-ended signal to a voltage between differential signal lines. It converts into the differential signal inverted into positive (+) and negative (-, phase inversion), and outputs the converted differential signal as an imaging signal.

  The attenuation unit 402a is provided on the patient circuit 4a side, and performs an attenuation process on the imaging signal (differential signal) transmitted from the imaging signal transmission unit 401a. Specifically, the attenuation unit 402a performs an attenuation process for reducing the amplitude of the image signal of each signal line, and outputs the image signal after the attenuation process to the first pulse transformer 403a. For example, the attenuation unit 402a performs an attenuation process for reducing the amplitude by half with respect to the imaging signal of each signal line.

  The first pulse transformer 403a is provided between the patient circuit 4a and the secondary circuit 4b, and outputs the imaging signal (pulse signal) attenuated by the attenuation unit 402a to the imaging signal reception unit 404a. Similar to the first pulse transformer 403, the first pulse transformer 403a is formed by applying a primary winding and a secondary winding to the magnetic core, and transmits a pulse signal, and by the primary winding and the secondary winding. The patient circuit 4a and the secondary circuit 4b are insulated.

  The amplifying unit 405a is provided on the secondary circuit 4b side, receives the image signal after attenuation output from the first pulse transformer 403a, performs a predetermined amplification process, and then receives the image signal after the amplification process. The image is output to the imaging signal receiving unit 404a. Specifically, when receiving the imaging signal of each signal line whose amplitude has been halved by the attenuating unit 402a, the amplifying unit 405a amplifies the signal twice and restores it to the imaging signal having the amplitude before attenuation.

  The imaging signal receiving unit 404 a is provided on the secondary circuit 4 b side, receives the imaging signal restored by the amplification unit 405 a, and transmits the received imaging signal to the second signal processing unit 43.

  On the patient circuit side of the insulated transmission unit 42, when the imaging signal generated by the imaging element 244 is received from the first signal processing unit 41, the imaging signal transmission unit 401a converts the single-ended signal into a differential signal, and the attenuation unit 402a Attenuation processing is performed to reduce the amplitude, and the first imaging transformer 403a transmits the attenuated imaging signal from the patient circuit 4a side to the secondary circuit 4b side while maintaining insulation between the patient circuit 4a and the secondary circuit 4b. To do. Further, on the secondary circuit side of the insulated transmission unit 42, the amplification unit 405a amplifies each of them twice to restore the imaging signal having the amplitude before attenuation, and the imaging signal reception unit 404a captures the imaging having the amplitude before attenuation. The signal is received, and the recovered image signal is used in the signal processing of the second signal processing unit 43 thereafter.

  According to the third embodiment described above, after the attenuation unit 402a performs attenuation processing to reduce the amplitude of the received imaging signal (differential signal), the first pulse transformer 403a and the patient circuit 4a are connected to the secondary signal. Since the attenuated imaging signal is transmitted from the patient circuit 4a side to the secondary circuit 4b side while maintaining insulation from the circuit 4b, the signal is transmitted using the pulse transformer (first pulse transformer 403a). Even when doing so, EMC and waveform quality can be maintained. Further, according to the above-described third embodiment, the amplifying unit 405a provided on the secondary circuit 4b side amplifies (restores) the attenuated imaging signal, so that the EMC and the waveform quality are more appropriate. And can be adapted to a signal transmission method (for example, LVDS method) in which a signal amplitude value is defined.

  Further, according to the third embodiment described above, by performing signal transmission with the voltage between the differential signal lines being positive (+) and negative (−, phase inversion), respectively, even if noise is mixed in each line. Since it can be canceled, it is more resistant to noise than a single-ended signal, and data can be transmitted at high speed.

  In the above-described third embodiment, the imaging signal transmission unit 401a converts the signal into a differential signal. However, at least the signal transmitted by the first pulse transformer 403a may be a differential signal, and the attenuation unit. It may be converted into a differential signal in 402a.

(Embodiment 4)
Next, a fourth embodiment of the present invention will be described. FIG. 6 is a block diagram illustrating a schematic configuration of the insulating transmission unit of the endoscope system according to the fourth embodiment. In addition, the same code | symbol is attached | subjected and demonstrated to the structure same as the structure mentioned above. In the first to third embodiments described above, the signal attenuation process or the attenuation process and the amplification process are performed in the imaging signal transmission path. However, in the fourth embodiment, the drive signal transmission path is used. Also performs attenuation processing and amplification processing.

  The insulated transmission unit 42a according to the fourth embodiment includes the above-described imaging signal transmission unit 401, attenuation unit 402, first pulse transformer 403, imaging signal reception unit 404, amplification unit 405, drive signal transmission unit 411, and second pulse. A transformer 412 and a drive signal receiving unit 413, an attenuation unit 414, and an amplification unit 415 are provided.

  The attenuating unit 414 is provided on the secondary circuit 4b side, and performs an attenuation process on the drive signal transmitted from the drive signal transmitting unit 411. Specifically, the attenuation unit 414 performs an attenuation process for reducing the amplitude of the drive signal, and outputs the image signal after the attenuation process to the second pulse transformer 412. For example, the attenuating unit 414 performs an attenuation process for reducing the amplitude by half with respect to the received drive signal.

  The amplification unit 415 is provided on the patient circuit 4a side, receives the drive signal after the attenuation process output from the second pulse transformer 412, performs a predetermined amplification process, and then drives the drive signal after the amplification process The signal is output to the signal receiving unit 413. Specifically, when the amplifying unit 415 receives the drive signal whose amplitude has been reduced by half by the attenuating unit 414, the amplifying unit 415 amplifies the drive signal by a factor of 2 to restore the drive signal having the amplitude before attenuation.

  Thereby, the drive signal receiving unit 413 receives the drive signal having the amplitude before attenuation, and the restored drive signal is used in the signal processing of the first signal processing unit 41 thereafter.

  According to the fourth embodiment described above, in addition to the effects of the second embodiment described above, the second pulse transformer 412 and the patient circuit 4a are connected to the patient circuit 4a after the attenuation unit 414 performs the attenuation process on the drive signal. Since the attenuated drive signal is transmitted from the secondary circuit 4b side to the patient circuit 4a side while maintaining insulation from the secondary circuit 4b, the pulse transformer (the first pulse transformer 403 and the second pulse transformer 412) is transmitted. ) Can be used to maintain EMC and waveform quality. Further, according to the fourth embodiment described above, the amplifying unit 415 provided on the patient circuit 4a side amplifies (restores) the attenuated drive signal. Can be maintained.

  In the fourth embodiment described above, the imaging signal and / or the drive signal may be transmitted by a differential transmission method as in the third embodiment described above.

  Further, in the third and fourth embodiments described above, it has been described that the attenuated signal is amplified (or restored). However, as in the first embodiment described above, only the attenuation process may be performed. Good.

  In the first to fourth embodiments, the first signal processing unit 41 and the insulated transmission unit 42 have been described as being provided in the processing device 4. However, these processing blocks are included in the endoscope 2 (for example, the operation unit). 22 or a connector portion connected to the processing device 4 of the universal cord 23). Furthermore, only the first signal processing unit 41 may be provided in the endoscope 2 (for example, a connector portion connected to the processing unit 4 of the operation unit 22 or the universal cord 23).

  In the first to fourth embodiments described above, the light source device 3 has been described as being separate from the processing device 4. However, the light source device 3 and the processing device 4 are integrated, for example, the processing device 4. The illumination unit 31 and the illumination control unit 32 may be provided on the secondary circuit 4b side.

  In the above-described first to fourth embodiments, the device connected to the processing device 4 is not limited to the endoscope 2 including the image pickup device 244 at the distal end of the insertion unit 21, for example, an optical scope or a fiberscope. It may be a camera head equipped with an image sensor that is mounted on the eyepiece of the optical endoscope and picks up an optical image formed by the optical endoscope.

  As described above, the medical device according to the present invention is useful for maintaining EMC and waveform quality even when a signal is transmitted using a pulse transformer.

DESCRIPTION OF SYMBOLS 1 Endoscope system 2 Endoscope 3 Light source device 4 Processing apparatus 5 Display apparatus 6 Recording apparatus 21 Insertion part 22 Operation part 23 Universal code 24 Tip part 25 Bending part 26 Flexible pipe part 31 Illumination part 32 Illumination control part 41 1st One signal processing unit 42 Insulated transmission unit 43 Second signal processing unit 44 Input unit 45 Control unit 401, 401a Imaging signal transmitting unit 402, 402a, 414 Attenuating unit 403, 403a First pulse transformer 404, 404a Imaging signal receiving unit 405 405a, 415 Amplifier 411 Drive signal transmitter 412 Second pulse transformer 413 Drive signal receiver

Claims (5)

Two circuits that are electrically isolated from each other between one circuit having a first reference potential and the other circuit having a second reference potential different from the first reference potential. A medical device for signal transmission,
An attenuator provided on the one circuit side for attenuating the amplitude of the received signal;
A pulse transformer for transmitting the signal attenuated by the attenuation unit from the one circuit to the other circuit while maintaining insulation between the one and the other circuit;
A medical device characterized by comprising:   The medical device according to claim 1, further comprising: an amplifying unit that is provided on the other circuit side and amplifies the amplitude of the signal that is attenuated by the attenuating unit transmitted by the pulse transformer.   The medical device according to claim 2, wherein the amplification factor of the amplitude of the amplification unit is a reciprocal of the attenuation factor of the amplitude of the attenuation unit.   The medical device according to claim 1, wherein the pulse transformer transmits a differential signal. A second attenuator provided on the other circuit side for attenuating the amplitude of the received signal;
A second pulse transformer that transmits the signal attenuated by the second attenuation unit from the other circuit to the one circuit while maintaining insulation between the one and the other circuit;
The medical device according to claim 1, further comprising:

Images