JP2017018571A - Endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an endoscope which does not require limitation of making a diameter of an insertion part thin, and which can suppress a high frequency which leaks from a treatment instrument channel from affecting a video signal of an image sensor.SOLUTION: An endoscope comprises on a tip end part of an insertion part, an image sensor 20 and a tip end part of a treatment instrument channel 14 extending along a longitudinal shaft of the insertion part. The image sensor 20 comprises plural terminals containing a video terminal 23a for outputting a video signal, and a distance La of the video terminal 23a is the longest, out of distances from a center C of the treatment instrument channel 14 to the respective terminals, the distances being distances in a plane S being vertical to the longitudinal shaft.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an endoscope including an image sensor at a distal end portion of an insertion portion to be inserted into a subject.

  A treatment instrument channel through which a treatment instrument is inserted is provided in the insertion portion of the endoscope, and in addition to observation using an image sensor provided at the distal end portion of the insertion section, the treatment instrument inserted through the treatment instrument channel In some cases, the observation site is treated.

  For example, a high-frequency treatment tool such as an electric knife may be used as the treatment tool. In the endoscope described in Patent Document 1, a shield piece is continuously provided on a circuit board to which an image sensor is connected, and a conductor exposed portion of an electric wire group connected to the circuit board is covered with the shield piece. It is suppressed that noise radiated from the treatment tool is mixed into the input / output of the image sensor.

JP 2011-212161 A

  Many members such as an image sensor, a treatment instrument channel, and a light guide for guiding illumination light for illuminating an observation site are incorporated in the distal end portion of the insertion portion.

  The diameter of the insertion part of the endoscope is required to be reduced, and the image sensor that occupies a relatively large space among the various members built in the distal end of the insertion part is very close to the treatment instrument channel. Will be arranged. For this reason, the input / output of the image sensor is easily affected by noise radiated from the high-frequency treatment instrument inserted into the treatment instrument channel. Then, when noise is mixed in the video signal output from the image sensor, there is a possibility that an appropriate observation and treatment may be hindered.

  The present invention has been made in view of the above-described circumstances, and can enhance resistance to noise radiated from a high-frequency treatment instrument inserted into a treatment instrument channel without restricting the diameter reduction of the insertion portion. The purpose is to provide an endoscope.

  An endoscope according to an aspect of the present invention includes an image sensor and a distal end portion of a treatment instrument channel extending along a longitudinal axis of the insertion portion at the distal end portion of the insertion portion, and the image sensor transmits a video signal. A plurality of terminals including a video terminal to be output, and the distance between the video terminals is a distance in a plane perpendicular to the longitudinal axis and a distance from the center of the treatment instrument channel for each terminal; The biggest.

  ADVANTAGE OF THE INVENTION According to this invention, the tolerance with respect to the noise radiated | emitted from the high frequency treatment tool inserted in the treatment tool channel can be strengthened, without restrict | sizing the diameter reduction of an insertion part.

It is a lineblock diagram of an example of an endoscope system for explaining an embodiment of the present invention. It is sectional drawing of an example of the insertion part front-end | tip part of the endoscope of FIG. FIG. 3 is a schematic diagram illustrating an example of a layout of terminals of an image sensor in the configuration example of the distal end portion of the insertion portion in FIG. 2. It is a schematic diagram which shows the other example of the layout of the terminal of the image sensor in the structural example of the insertion part front-end | tip part of FIG. It is a schematic diagram which shows the other example of the layout of the terminal of the image sensor in the structural example of the insertion part front-end | tip part of FIG. It is a schematic diagram which shows the other example of the layout of the terminal of the image sensor in the structural example of the insertion part front-end | tip part of FIG. It is a schematic diagram which shows the other example of the layout of the terminal of the image sensor in the structural example of the insertion part front-end | tip part of FIG. It is sectional drawing of the other example of the insertion part front-end | tip part of the endoscope of FIG. It is sectional drawing of the other example of the insertion part front-end | tip part of the endoscope of FIG. It is a schematic diagram which shows an example of the layout of the terminal of the image sensor in the structural example of the insertion part front-end | tip part of FIG.

  FIG. 1 shows an example of an endoscope system for explaining an embodiment of the present invention.

  The endoscope system 1 includes an endoscope 2, a light source unit 3, and a processor unit 4. The endoscope 2 includes an insertion portion 6 that is inserted into a subject, an operation portion 7 that is continuous with the insertion portion 6, and a universal cord 8 that extends from the operation portion 7. The bending portion 11 is connected to the distal end portion 10, and the flexible portion 12 connects the bending portion 11 and the operation portion 7.

  The distal end portion 10 is provided with an illumination optical system that emits illumination light for illuminating the observation site, and an image sensor and an imaging optical system that image the observation site. The bending portion 11 is configured to be able to bend in a direction orthogonal to the longitudinal axis of the insertion portion 6, and the bending operation of the bending portion 11 is operated by the operation portion 7. Further, the flexible portion 12 is configured to be relatively flexible so as to be deformable following the shape of the insertion path of the insertion portion 6.

  The operation unit 7 is provided with a button for operating the imaging operation of the image sensor at the tip 10 and a rotary knob for operating the bending operation of the bending unit 11. The operation unit 7 is provided with an insertion port 13 into which a treatment instrument such as an electric knife is inserted. The treatment unit is inserted into the insertion unit 6 from the insertion port 13 to the distal end portion 10. A treatment instrument channel 14 is provided.

  A connector 9 is provided at the end of the universal cord 8, and the endoscope 2 generates the illumination light emitted from the illumination optical system of the distal end portion 10 via the connector 9, and the distal end portion 10. It is connected to a processor unit 4 that processes a video signal acquired by the image sensor. The processor unit 4 processes the input video signal to generate video data of the observation site, and displays and records the generated video data on the monitor 5.

  A light guide and an electric wire group are provided inside the insertion portion 6, the operation portion 7, and the universal cord 8. Illumination light generated by the light source unit 3 via the light guide is guided to the illumination optical system of the tip 10, and signals and power are transmitted between the image sensor of the tip 10 and the processor unit 4 via the electric wire group. Is transmitted.

  FIG. 2 shows a configuration example of the distal end portion 10 of the insertion portion 6.

  An image sensor 20 such as a CCD (Charge Coupled Device) image sensor or a CMOS (Complementary Metal Oxide Semiconductor) image sensor, and an objective optical system 21 that forms a subject image on an image receiving surface 20a of the image sensor 20 are provided at the distal end portion 10. A lead-out port 22 for the treatment instrument channel 14 is provided. Although not shown, the distal end portion 10 is also provided with an illumination optical system that emits illumination light guided from the light source unit 3 through a light guide.

  The image receiving surface 20 a of the image sensor 20 is disposed substantially perpendicular to the longitudinal axis A of the insertion portion 6. The optical axis of the objective optical system 21 is substantially parallel to the longitudinal axis A of the insertion portion 6, and among the optical elements constituting the objective optical system 21, the objective optical element 21 a located closest to the subject is exposed on the end face of the distal end portion 10. doing.

  The treatment instrument channel 14 extends substantially parallel to the longitudinal axis A of the insertion portion 6 and is arranged in parallel with the image sensor 20 and the objective optical system 21, and the outlet 22 of the treatment instrument channel 14 is formed on the end surface of the distal end portion 10. It is open.

  The image sensor 20 has a plurality of terminals 23 including a video terminal for outputting a video signal. In the illustrated example, these terminals 23 are provided on a back surface 20b opposite to the image receiving surface 20a side of the image sensor 20. It has been. In addition, the arrangement | positioning location of the terminal 23 is not restricted to the back surface 20b, For example, you may provide in the side surface of the image sensor 20. FIG.

  One end of each conductor of the wire group 24 that connects the image sensor 20 and the processor unit 4 (see FIG. 1) is connected to the terminal 23 via the flexible circuit board 25 and the terminal 23. Examples of the connection method include ACF (Anisotropic Conductive Film) connection, NCF (Non Conductive Film) connection, and bump connection. Note that one end of each conductor of the wire group 24 may be directly connected to the terminal 23.

  FIG. 3 shows an example of the layout of the terminals 23 of the image sensor 20 at the distal end portion 10 of the insertion portion 6 of FIG.

  In the example shown in FIG. 3, as the terminal 23, a video terminal 23 a that outputs a video signal, a control terminal 23 b that receives a control signal that controls the operation of the image sensor 20, and an operating power of the image sensor 20 are input. A total of four terminals, a power supply terminal 23c and a ground terminal 23d, are provided, and the four video terminals 23a, the control terminal 23b, the power supply terminal 23c, and the ground terminal 23d are substantially rectangular images in plan view. Of the four sides of the back surface 20b of the sensor 20, the image sensor 20, the objective optical system 21, and the treatment instrument channel 14 are arranged side by side along one side extending in a direction substantially orthogonal to the direction in which the sensor 20 is arranged.

  The video terminal 23 a is disposed at a position farthest from the treatment instrument channel 14. That is, the distance La of the video terminal 23a is the largest among the distances in the plane perpendicular to the longitudinal axis A of the insertion portion 6 and the distance from the center C of the treatment instrument channel 14 for each terminal. In the illustrated example, the video terminal 23a, the control terminal 23b, the power supply terminal 23c, and the ground terminal 23d are provided on the back surface 20b of the image sensor 20 that is disposed substantially orthogonal to the longitudinal axis A. The distance from the center C of the treatment instrument channel 14 of each terminal is within the plane S perpendicular to the longitudinal axis A common to the four terminals of the video terminal 23a, the control terminal 23b, the power supply terminal 23c, and the ground terminal 23d. Set by.

  By arranging the video terminal 23a at the position farthest from the treatment instrument channel 14, noise radiated from the high-frequency treatment instrument inserted into the treatment instrument channel 14 is mixed into the video signal output from the video terminal 23a. Therefore, it is possible to obtain a clear image required for performing appropriate observation and treatment. Further, the noise resistance of the endoscope 2 can be increased by the arrangement of the video terminal 23a without depending on the shield, which contributes to a reduction in the diameter of the insertion portion 6.

  The influence of noise is easily manifested in the video signal output from the video terminal 23a and proper control signal input to the control terminal 23b when performing appropriate observation and treatment. On the other hand, the operating power input to the power supply terminal 23c and the ground are difficult to be manifested.

  Therefore, the ground terminal 23d is arranged at a position closest to the treatment instrument channel 14 as shown in the example, that is, the distance Ld from the center C of the treatment instrument channel 14 to the ground terminal 23d in the plane S is minimized. Alternatively, it is preferable that the power terminal 23c is arranged at a position closest to the treatment instrument channel 14, that is, the distance Lc from the center C of the treatment instrument channel 14 to the power supply terminal 23c in the plane S is minimized. Thereby, the noise tolerance of the endoscope 2 can be further enhanced.

  FIG. 4 shows another example of the layout of the terminals 23 of the image sensor 20 at the distal end portion 10 of the insertion portion 6 of FIG.

  In the example illustrated in FIG. 4, as the terminal 23, a video terminal 23 a that outputs a video signal, a control terminal 23 b that receives a control signal that controls the operation of the image sensor 20, and an operating power of the image sensor 20 are input. A total of four terminals, a power supply terminal 23c and a ground terminal 23d, are provided, and the four video terminals 23a, the control terminal 23b, the power supply terminal 23c, and the ground terminal 23d are substantially rectangular images in plan view. Of the four sides of the back surface 20 b of the sensor 20, the image sensor 20 and the objective optical system 21 and the treatment instrument channel 14 are arranged side by side along one side extending in the arrangement direction.

  The video terminal 23 a is disposed at a position farthest from the treatment instrument channel 14. That is, the distance La of the video terminal 23a is the largest among the distances in the plane perpendicular to the longitudinal axis A of the insertion portion 6 and the distance from the center C of the treatment instrument channel 14 for each terminal. The distance of each terminal from the center C of the treatment instrument channel 14 is within a plane S perpendicular to the longitudinal axis A in common with the four terminals of the video terminal 23a, the control terminal 23b, the power supply terminal 23c, and the ground terminal 23d. Is set.

  By arranging the video terminal 23a at a position farthest from the treatment instrument channel 14, noise radiated from the high-frequency treatment instrument inserted into the treatment instrument channel 14 is transmitted from the video terminal 23a as in the example shown in FIG. Mixing in the output video signal can be suppressed, and a clear video required for performing appropriate observation and treatment can be obtained. In addition, the noise resistance of the endoscope 2 can be increased by the arrangement of the video terminal 23a without depending on the shield, which contributes to a reduction in the diameter of the insertion portion 6.

  Then, by reducing the distance Ld from the center C of the treatment instrument channel 14 to the ground terminal 23 d in the plane S or by disposing the power supply terminal 23 c closest to the treatment instrument channel 14, the endoscope 2. Noise resistance can be further increased.

  FIG. 5 shows another example of the layout of the terminals 23 of the image sensor 20 at the distal end portion 10 of the insertion portion 6 of FIG.

  In the example illustrated in FIG. 5, the video terminals 23 a, the control terminals 23 b, the power supply terminals 23 c, and the ground terminals 23 d are arranged in a matrix of two rows and two columns along the four sides of the back surface 20 b of the image sensor 20. Compared to the example shown in FIGS. 3 and 4 in which the video terminal 23a, the control terminal 23b, the power supply terminal 23c, and the ground terminal 23d are arranged along one side of the back surface 20b, the size of each terminal can be increased. The terminal and the land of the flexible circuit board 25 or the conductor of the electric wire group 24 can be easily and reliably connected.

  Also in the example shown in FIG. 5, the video terminal 23 a is arranged at the position farthest from the treatment instrument channel 14, that is, the distance within the plane perpendicular to the longitudinal axis A of the insertion portion 6 and the treatment instrument channel for each terminal. Among the distances from the center C of 14, the distance La of the video terminal 23 a is maximized, thereby radiating from the high-frequency treatment instrument inserted into the treatment instrument channel 14 without restricting the diameter reduction of the insertion portion 6. It is possible to enhance resistance to noise.

  So far, the image sensor 20 has been described as being provided with a total of four terminals, that is, the video terminal 23a, the control terminal 23b, the power supply terminal 23c, and the ground terminal 23d, but the number of terminals is not limited to four. .

  In the example shown in FIG. 6, a fifth terminal is provided by adding a fifth terminal to the video terminal, the control terminal, the power supply terminal, and the ground terminal, and an external clock signal is input as the fifth terminal. An external clock terminal to be input or a reset terminal to which a reset signal is input can be exemplified. Although illustration is omitted, a total of six terminals can be provided by adding both an external clock terminal and a reset terminal.

  Furthermore, in the example shown in FIG. 7, the control terminals are input SCS (Serial Chip Select) terminal to which a chip select signal is input, SCK (Serial Clock) terminal to which a serial clock signal is input, and serial data is input. Subdivided into SI (Serial Data Input) terminals, a total of eight terminals are provided, including a video terminal, a power supply terminal, a ground terminal, an external clock terminal, and a reset terminal.

  6 and 7, the video terminal 23a is disposed at the position farthest from the treatment instrument channel 14, that is, the distance within the plane perpendicular to the longitudinal axis A of the insertion portion 6 is the terminal. Among the distances from the center C of the treatment instrument channel 14, the distance La of the video terminal 23 a is maximized so that the insertion portion 6 is inserted into the treatment instrument channel 14 without restricting the diameter reduction. Resistance to noise radiated from the high-frequency treatment tool can be enhanced.

  Note that the video signal can be transmitted by being superimposed with various signals such as a control signal, an external clock signal, and a reset signal, and a total of three terminals including a signal terminal for inputting and outputting the superimposed signal including the video signal, a power terminal, and a ground terminal. It can also be a single terminal. In this case, the signal terminal for inputting and outputting the superimposed signal including the video signal may be arranged at the position farthest from the treatment instrument channel 14.

  Further, as shown in FIG. 8, the image receiving surface 20 a and the opposite back surface 20 b of the image sensor 20 may be arranged obliquely with respect to the longitudinal axis A of the insertion portion 6. In this case, the plane perpendicular to the longitudinal axis A on which the distance from the center of the treatment instrument channel 14 of each terminal is set is different for each terminal.

  In the example shown in FIG. 8, the video terminal 23a and the control terminal 23b are provided along the upper side opposite to the treatment instrument channel 14 side of the back surface 20b, and the power terminal 23c and the ground terminal 23d are the treatment instrument channel 14 side of the back surface 20b. The distance La of the video terminal 23a and the distance Lb of the control terminal 23b are set in a plane S1 that includes the video terminal 23a and the control terminal 23b and is perpendicular to the longitudinal axis A. The distance Lc of 23c and the distance Ld of the ground terminal 23d are set in a plane S2 including the power supply terminal 23c and the ground terminal 23d and perpendicular to the longitudinal axis A.

  FIG. 9 shows another configuration example of the distal end portion 10 of the insertion portion 6, and FIG. 10 shows an example of the layout of the terminals 23 of the image sensor 20 in the distal end portion 10 of the insertion portion 6 in FIG.

  In the example shown in FIGS. 9 and 10, the image receiving surface 20 a of the image sensor 20 is substantially parallel to the longitudinal axis A of the insertion portion 6 and substantially parallel to the direction in which the objective optical system 21 and the treatment instrument channel 14 are arranged. A prism 26 is disposed between the objective optical system 21 and the image sensor 20. The light incident on the prism 26 from the objective optical system 21 is reflected by the reflecting surface 27 of the prism 26 and enters the image receiving surface 20 a of the image sensor 20.

  And in the area | region arrange | positioned on the outer side of the prism 26 in the surface of the image sensor 20 provided with the image receiving surface 20a, as shown in FIG. 10, as shown in FIG. 10, a video terminal 23a, a control terminal 23b, A total of four terminals, that is, a power terminal 23c and a ground terminal 23d, are provided. These four video terminals 23a, a control terminal 23b, a power terminal 23c, and a ground terminal 23d are connected to the image sensor 20 and the objective optical system. 21 and the treatment instrument channel 14 are arranged side by side in the arrangement direction.

  The video terminal 23 a is disposed at a position farthest from the treatment instrument channel 14. That is, the distance La of the video terminal 23a is the largest among the distances in the plane perpendicular to the longitudinal axis A of the insertion portion 6 and the distance from the center C of the treatment instrument channel 14 for each terminal. Thereby, similarly to the example shown in FIG. 3, it is possible to suppress the noise radiated from the high-frequency treatment instrument inserted into the treatment instrument channel 14 from being mixed into the video signal output from the video terminal 23a, and to perform appropriate observation. In addition, a clear image required for performing the treatment can be obtained. In addition, the noise resistance of the endoscope 2 can be increased by the arrangement of the video terminal 23a without depending on the shield, which contributes to a reduction in the diameter of the insertion portion 6.

  In the example shown in FIGS. 9 and 10, one end of each conductor of the wire group 24 is directly connected to the terminal 23. However, as in the example shown in FIG. May be connected to the terminal 23 via the flexible circuit board 25.

  As described above, the endoscope disclosed in the present specification includes the image sensor and the distal end portion of the treatment instrument channel extending along the longitudinal axis of the insertion portion at the distal end portion of the insertion portion. The sensor has a plurality of terminals including a video terminal for outputting a video signal, and is a distance in a plane perpendicular to the longitudinal axis and a distance from the center of the treatment instrument channel for each of the terminals, The distance between the video terminals is the largest.

  The disclosed endoscope includes a power supply terminal to which operating power of the image sensor is supplied, and the distance between the power supply terminals is the smallest.

  The disclosed endoscope includes a ground terminal in the terminal, and the distance between the ground terminals is the shortest.

  In the disclosed endoscope, the terminal is provided on the back surface opposite to the image receiving surface side of the image sensor.

  In the disclosed endoscope, the number of the terminals is four.

  In the disclosed endoscope, the terminals are arranged in a matrix of two rows and two columns along the four sides of the back surface.

DESCRIPTION OF SYMBOLS 1 Endoscope system 2 Endoscope 3 Light source unit 4 Processor unit 5 Monitor 6 Insertion part 7 Operation part 8 Universal cord 9 Connector 10 Tip part 11 Bending part 12 Flexible part 13 Insertion port 14 Treatment tool channel 20 Image sensor 20a Image receiving surface 20b Back surface 21 Objective optical system 21a Objective optical element 22 Lead-out port 23 Terminal 23a Video terminal 23b Control terminal 23c Power supply terminal 23d Ground terminal 24 Wire group 25 Flexible circuit board 26 Prism 27 Reflective surface A Longitudinal axis C Center La Distance Lb Distance Lc Distance Ld Distance S Surface S1 Surface S2 Surface

Claims (6)

An image sensor;
A distal end portion of the treatment instrument channel extending along the longitudinal axis of the insertion portion;
At the distal end of the insertion part,
The image sensor has a plurality of terminals including a video terminal for outputting a video signal;
An endoscope in which the distance of the video terminal is the longest in the plane perpendicular to the longitudinal axis and the distance from the center of the treatment instrument channel for each terminal. The endoscope according to claim 1, wherein
A power supply terminal to which operating power of the image sensor is supplied is included in the terminal,
An endoscope in which the distance between the power terminals is the smallest. The endoscope according to claim 1, wherein
A ground terminal is included in the terminal,
An endoscope having the smallest distance between the ground terminals. The endoscope according to any one of claims 1 to 3,
The said terminal is an endoscope provided in the back surface on the opposite side to the image receiving surface side of the said image sensor. The endoscope according to claim 4, wherein
An endoscope having four terminals. The endoscope according to claim 5, wherein
An endoscope in which the terminals are arranged in a matrix of two rows and two columns along the four sides of the back surface.

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