JP6401004B2 - Endoscope cable module - Google Patents

Description

  The present invention relates to an endoscope cable module in which a plurality of shielded coaxial wires are integrally grounded.

  In recent years, industrial and medical endoscopes have been widely used. In particular, in a medical endoscope, an insertion portion is inserted deep inside the body, and it is possible to perform treatments such as observation of a lesioned portion and treatment as necessary. As this type of endoscope, for example, an electronic endoscope having an imaging device in which a solid-state imaging device such as a CCD or CMOS is built in at a distal end portion of an insertion portion is known.

  Generally, in such an electronic endoscope, a cable module for driving an imaging device or the like is inserted into the insertion portion. Such a cable module is composed of a composite signal cable in which a plurality of signal lines and the like are integrally covered with an outer cover, and among these various signal lines constituting the cable module, in particular, a drive signal and a video signal are transmitted. The signal line for this purpose is composed of a coaxial line for the purpose of reducing the influence of noise and the like. For example, as disclosed in Patent Document 1, the shield members (shield wires) of the plurality of coaxial wires (coaxial cables) are grouped together at the tip side of the cable module ((signal cable)). After that, they are integrally connected to the ground via a jumper wire, etc. Here, as a configuration for connecting the shield members of the coaxial cables together, conduction by soldering is widely used in general. Yes.

JP-A-10-33470

  However, in an endoscope, in order to reduce the diameter of the insertion portion and the like, an extremely thin coaxial line is adopted as the coaxial line constituting the cable module. Therefore, depending on the shape of the solder that conducts each shield member, the core wire of the coaxial line may be damaged, and the ground and the core wire may be short-circuited.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide an endoscope cable module capable of conducting between a plurality of coaxial wire shield members without damaging a core wire.

An endoscope cable module according to an aspect of the present invention includes a plurality of coaxial lines each covered by a shield member, a plurality of simple lines formed by a center conductor and an insulating coating covering the center conductor, and a hollow A pedestal that is formed in a state in which the shield members of the plurality of coaxial lines are in contact with an outer peripheral surface , and the plurality of simple lines are inserted into the inner peripheral side of the hollow portion ; A restraining member that has an elastic ring shape and sandwiches and bundles the plurality of shield members disposed on the pedestal between the pedestal and at least one of the pedestal or the restraining member Is constituted by a conductive member.
An endoscope cable module according to another aspect of the present invention includes a plurality of coaxial lines each covered with a shield member, and the shield members of the plurality of coaxial lines in contact with each other on an outer peripheral surface. A pedestal disposed; and a restraining member that forms an elastic ring shape and sandwiches and bundles the plurality of shield members disposed on the pedestal between the pedestal and the pedestal or the restraining member. At least one of them is formed of a conductive member, and the outer peripheral surface of the pedestal is formed of a tapered surface that expands toward the tip side.

  According to the cable module for an endoscope of the present invention, it is possible to conduct between a plurality of coaxial wire shield members without damaging the core wire.

The figure which shows the whole structure of an endoscope apparatus. Sectional drawing which shows the internal structure of the front-end | tip rigid part of an electronic endoscope Sectional drawing which shows the structure of an imaging device The perspective view which shows the principal part of a cable module Cross-sectional view of main parts along the longitudinal axis direction of the cable module Sectional view along line VI-VI in FIG. The perspective view which shows the principal part of a coaxial wire The perspective view which shows the principal part of a simple line Sectional drawing which shows the principal part of a cable module concerning a 1st modification along a longitudinal axis direction Sectional drawing which shows the principal part of a cable module concerning a 2nd modification along a longitudinal axis perpendicular direction Sectional drawing which shows the principal part of a cable module concerning a 3rd modification along a longitudinal axis direction

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The drawings relate to an embodiment of the present invention, FIG. 1 is a diagram showing the overall configuration of the endoscope apparatus, FIG. 2 is a cross-sectional view showing the internal configuration of the distal rigid portion of the electronic endoscope, and FIG. FIG. 4 is a perspective view showing the main part of the cable module, FIG. 5 is a cross-sectional view of the main part along the longitudinal axis direction of the cable module, and FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. FIG. 7 is a perspective view showing the main part of the coaxial line, and FIG. 8 is a perspective view showing the main part of the simple line.

  As shown in FIG. 1, an endoscope apparatus 1 includes an electronic endoscope (hereinafter simply referred to as an endoscope) 2, a light source device 3, a video processor 4, and a monitor 5. ing.

  The endoscope 2 of the present embodiment includes an elongated insertion portion 11, an operation portion 12 that is connected to the proximal end side of the insertion portion 11, a universal cord 13 that extends from a side portion of the operation portion 12, It is configured with.

  The insertion portion 11 includes a distal end rigid portion 15 provided at the distal end, a bendable bending portion 16 provided on the proximal end side of the distal end rigid portion 15, and a length provided on the proximal end side of the bending portion 16. And a flexible tube 17 having flexibility with a scale. Here, the distal end rigid portion 15 has an imaging device to be described later. This imaging device is a CCD or CMOS that photoelectrically converts an optical image formed by an objective optical system disposed in the distal end rigid portion 15. Or the like.

  The operation unit 12 is provided with a bending operation lever (not shown). By rotating the bending operation lever, the endoscope 2 can bend the bending portion in four directions or two directions.

  In addition, a treatment instrument insertion port 18 for inserting a treatment instrument such as a biopsy forceps or a laser probe is provided on the side near the distal end of the operation unit 12. The endoscope 2 in which the treatment tool is inserted into the treatment tool insertion port 18 projects the distal end processing portion of the treatment tool through a treatment tool insertion channel, which will be described later, disposed inside, for example, one of the treatment tools. A biopsy or the like for collecting the buttock tissue can be performed with the biopsy forceps.

  The universal cord 13 has a light guide connector 13a at its end, and the endoscope 2 is detachably connected to the light source device 3 through the light guide connector 13a. A signal cable 14 extends from the side of the light guide connector 13a, and the endoscope 2 is detachably connected to the video processor 4 through an electrical connector 14a provided at the end of the signal cable 14. Is done. The video processor 4 can be connected to peripheral devices (not shown) such as a VTR deck, a video printer, and a video disk.

  The light source device 3 is a device for incorporating a halogen lamp or the like as a light source and supplying light from the halogen lamp or the like as illumination light to the endoscope 2.

  The video processor 4 is a device that supplies power to the above-described image sensor and receives a video signal photoelectrically converted from the image sensor. That is, the video processor 4 performs signal processing of a video signal imaged by the imaging device, control such as adjustment of gain of the imaging device, and output of a driving signal for driving.

  The monitor 5 is for receiving an image signal output from the connected video processor 4 and displaying an endoscopic image.

  Next, the configuration of the distal end rigid portion 15 of the endoscope 2 will be described below with reference to FIG.

  The distal end rigid portion 15 of the insertion portion 11 has a distal end member 21 to which the distal end cap 22 is fitted. A through hole 25 is formed in the tip member 21, and an imaging device 34 for capturing a subject image is inserted into the through hole 25.

  Further, a through hole 27 is formed in the distal end member 21, and the distal end side of the light guide 28 inserted into the insertion portion 11 is fixed to the through hole 27, and further transmitted by the light guide 28. An illumination optical system 29 that emits illumination light from the light source device 3 is provided. The light guide 28 is covered with a covering tube 100 and further covered with a protective tube 101, and the distal end side of the protective tube 101 is fixed with a thread 102.

  Thereby, the illumination light supplied from a lamp (not shown) provided in the light source device 3 shown in FIG. 1 is transmitted to the light guide connector 13a, the universal cord 13, the operation unit 12 of the endoscope 2, and the insertion unit. 11 is guided to the distal end rigid portion 15 through the above-described light guide 28 that is inserted through the inside. The illumination light transmitted to the distal end rigid portion 15 illuminates the subject from the distal end surface of the distal end rigid portion 15 via the illumination optical system 29.

  The subject illuminated by the illumination light is imaged by the imaging device 34 provided in the distal end rigid portion 15, and an electrical signal (video signal) of the subject image obtained by this imaging is transmitted to the video processor 4. The video processor 4 can process the input electrical signal and convert it into a video signal, and then output the video signal to the monitor 5 to display an observation image on the screen of the monitor 5.

  The distal end member 21 has a through hole 104, and a treatment instrument insertion channel 103 including a connection pipe 105, a treatment instrument insertion tube 106, and the like is provided in the through hole 104. A thread 107 is wound around the distal end side of the treatment instrument insertion tube 106 so as to be connected and fixed to the connection pipe 105.

  Further, the distal end member 21 is covered with a tube-shaped curved rubber 23 on the outer peripheral side of the base end from the middle portion of the outer periphery that is not covered by the distal end cap 22. A thread 90 is wound around the outer peripheral portion of the curved rubber 23 and an adhesive 24 is applied thereto. Thereby, the tip member 21 and the curved rubber 23 are fixed.

  Next, a detailed configuration of the imaging device 34 incorporated in the endoscope 2 will be described below with reference to FIG.

  As shown in FIG. 3, the imaging device 34 includes an objective optical unit 32 having an objective lens group 31 as an objective optical system, and an imaging element package 33.

  The objective optical unit 32 includes an objective lens group 31 that is an objective optical system. The objective lens group 31 is configured so that an object image is formed on a light receiving portion 41 a of the image sensor 41 provided in the image sensor package 33. It is disposed at a predetermined position of the lens frame 32a. The imaging device 34 includes an imaging element frame 34a that is externally fitted and fixed to the proximal end side of the objective lens frame 32a. An image sensor package 33 is connected to the rear end side of the image sensor frame 34a. In addition, a reinforcing frame 218 is fitted and fixed to the rear end side of the image sensor frame 34a. An adhesive 204 is filled between the reinforcing frame 18 and the image pickup device package 33.

  In addition, the distal end side of the cable module 50 inserted into the insertion portion 11 is electrically connected to the imaging element package 33. The distal end side of the cable module 50 is sealed with an adhesive 204 after being connected to the imaging element package 33, and further covered with a heat shrinkable tube 36 that is externally fitted to the reinforcing frame 218. On the other hand, the base end side of the cable module 50 can be electrically connected to the video processor 4 via the operation unit 12, the universal cord 13, the signal cable 14, and the electrical connector 14a.

  As shown in FIGS. 4 and 6, the cable module 50 is formed of a plurality of coaxial lines 51 and a plurality of simple lines 52, PTFE (tetrafluoroethylene resin), and the like. Insulating tape 53 spirally wound around, a silver-plated copper alloy or the like, a general shield 54 disposed on the outer peripheral side of the insulating tape 53, a PFA (fluororesin) or the like, and a total shield 54, and an outer tube 55 disposed on the outer peripheral side of the outer peripheral portion 54. In the following description, the insulating tape 53, the general shield 54, and the outer tube 55 are appropriately collectively referred to as “the outer tube 55 and the like”.

  As the coaxial line 51 constituting the cable module 50 of the present embodiment, for example, a coaxial line for driving signal for transmitting a driving signal to the imaging element package 33 and an imaging element inside the outer tube 55 and the like A video signal coaxial line or the like for transmitting the video signal generated in the package 33 is inserted. For example, as shown in FIG. 7, the coaxial wires 51 include an inner conductor 51a in which a plurality of strands are twisted, and an inner insulating sheath 51b that covers the inner conductor 51a, and a core wire 51c. The outer conductor 51d is a shield member that covers the outer conductor, and the outer insulating coating 51e that covers the outer conductor 51d.

  In addition, as the simple line 52 constituting the cable module 50 of the present embodiment, for example, a drive signal circuit ground simple line, a video output circuit ground simple line, or the like is inserted into the outer tube 55 or the like. Yes. For example, as shown in FIG. 8, these simple lines 52 include a conductor 52a in which a plurality of strands are twisted together and an insulating coating 52b covering the conductor 52a.

  The distal ends of the coaxial lines 51 and the simple lines 52 are exposed from the outer tube 55 or the like.

  In the exposed region from the outer tube 55 or the like, the insulating coating 51e of the coaxial line 51 is removed, and the outer conductor 51d is exposed to the outside by the removal of the insulating coating 51e. Further, a core wire 51c protrudes from the exposed outer conductor 51d on the tip side. The inner insulating coating 51b is removed at the leading end side of the protruding core wire 51c, and the inner conductor 51a is exposed to the outside by the removal of the inner insulating coating 51b. The inner conductor 51a exposed from the inner insulating coating 51b is connected to a land (not shown) provided in the image sensor package 33 or the like by soldering or the like.

  Further, in the exposed region from the outer tube 55 or the like, the insulating coating 52b on the tip side of the simple line 52 is removed, and the conductor 52a is exposed to the outside by the removal of the insulating coating 52b. The conductor 52a exposed from the insulating coating 52b is connected to a land or the like (not shown) provided in the image sensor package 33 or the like by soldering or the like.

  Further, as shown in FIGS. 4 to 6, in a region exposed from the outer tube 55 or the like, a pedestal capable of contacting the outer conductor 51d is located at a position corresponding to the outer conductor 51d exposed from each coaxial line 51. 60 and a restraining member 61 that is externally mounted on the pedestal 60 are provided.

  The pedestal 60 of the present embodiment is configured by, for example, a metal ring-shaped member having conductivity, and an outer peripheral surface thereof is set as a contact surface 60a with each external conductor 51d. And each coaxial line 51 is arrange | positioned by the outer peripheral side of this base 60, and each simple line 52 is penetrated by the inner peripheral side.

  Moreover, the restraining member 61 of this embodiment is comprised by the ring-shaped member made from the conductive rubber which has elasticity, for example. The restraining member 61 is externally mounted on the pedestal 60 from the outside of each coaxial line 51, whereby the outer conductor 51 d of each coaxial line 51 is sandwiched and bundled between the pedestal 60. By this restraining member 61, each outer conductor 51d is elastically pressed against the contact surface 60a of the pedestal 60 and is electrically connected to each other. That is, the outer conductor 51d of each coaxial line 51 is electrically connected to each other via the conductive base 60 and the restraining member 61.

  Here, for example, as shown in FIGS. 4 and 5, between the pedestal 60 and the restraining member 61, the other end side of the jumper wire 63 whose one end side is connected to a ground portion (not shown) such as the image pickup device package 33 is arranged. It is installed. Thereby, each outer conductor 51 d is connected to the jumper wire 63 via the pedestal 60 and the restraining member 61, and is grounded via this jumper wire 63.

  The pedestal 60 and the restraining member 61 are sealed with the adhesive 20 integrally with the distal end side of the cable module 50, and the conduction state between the external conductors 51d is maintained by this sealing.

  According to such an embodiment, the pedestal 60 made of a conductor disposed in a state in which the outer conductor 51d that is a shield member of the plurality of coaxial lines 51 is in contact with the outer peripheral surface, and the conductor having elasticity And a ring-shaped restraining member 61 that sandwiches and bundles a plurality of external conductors 51d disposed on the pedestal 60 between the coaxial wires without damaging the core wire 51c. The 51 outer conductors 51d can be made conductive.

  That is, the outer conductor 51d of the plurality of coaxial wires 51 is sandwiched and bundled between the outer peripheral surface (abutment surface 60a) of the pedestal 60 by an elastic ring-shaped restraining member 61, thereby causing factors such as damage to the core wire 51c. Thus, it is possible to achieve conduction between the external conductors 51d without using solder or the like. In this case, conduction between the external conductors 51d can be accurately realized by elastically wrapping and bundling the external conductors 51d by the restraining member 61.

  Here, for example, as shown in FIG. 9, the contact surface 60 a set on the outer peripheral surface of the pedestal 60 can be configured by a tapered surface that expands toward the distal end side. With this configuration, the core wire 51c of each coaxial line 51 can be guided so as to extend obliquely outward in the radial direction of the cable module 50, and each coaxial line 51 is soldered to a land or the like of the image pickup device package 33. It is possible to improve the workability when performing.

  For example, as shown in FIG. 10, a plurality of partial arc-shaped guide grooves 60 b extending in the axial direction of the cable module 50 are provided on the contact surface 60 a set on the outer peripheral surface of the pedestal 60. It is also possible to bring each outer conductor 51d into contact with the contact surface 60a along 60b. By configuring in this way, a plurality of coaxial lines 51 formed with extremely small diameters can be individually routed without crossing between the pedestal 60 and the restraining member 61, and external to the pedestal 60. The conductor 51d can be accurately electrically connected.

  Further, for example, as shown in FIG. 11, the pedestal 60 is made of a material such as a metal material having high resistance to laser light, and the outer peripheral surface on the pedestal 60 is set as a work area A for the laser strip. Is also possible. The base 60 is made of a material highly resistant to laser light, the coaxial line 51 is disposed on the outer peripheral side of the base 60, and the simple line 52 is disposed on the inner peripheral side of the base 60, thereby insulating the simple line 52. Only the insulating coating 51e of the coaxial line 51 can be accurately removed using a laser strip or the like without damaging the coating 52b or the like.

  In addition, this invention is not limited to each embodiment described above, A various deformation | transformation and change are possible, and they are also in the technical scope of this invention. For example, it is needless to say that the configurations shown in the above-described embodiment and each modification may be combined as appropriate.

  Further, in each of the above-described embodiments, the configuration in which the pedestal 60 and the restraining member 61 are made conductive has been described. However, the present invention is not limited to this. At least one of them can be made conductive.

  In the above-described embodiment, an example of the cable module that is electrically connected to the imaging device 34 of the endoscope has been described. However, the present invention is not limited to this, and for example, an ultrasonic endoscope It is also possible to apply the present invention to a cable module or the like that is electrically connected to the ultrasonic transducer.

DESCRIPTION OF SYMBOLS 1 ... Endoscope apparatus 2 ... Endoscope 3 ... Light source apparatus 4 ... Video processor 5 ... Monitor 11 ... Insertion part 12 ... Operation part 13 ... Universal cord 13a ... Light guide connector 14 ... Signal cable 14a ... Electric connector 15 ... Tip Rigid part 16 ... bending part 17 ... flexible tube 18 ... treatment instrument insertion port 33 ... imaging element package 34 ... imaging device 34a ... imaging element frame 36 ... heat shrinkable tube 41 ... imaging element 41a ... light receiving part 50 ... cable module 51 ... Coaxial wire 51a ... Inner conductor 51b ... Inner insulation coating 51c ... Core wire 51d ... Outer conductor 51e ... Outer insulation coating 52 ... Simple wire 52a ... Conductor 52b ... Insulation coating 53 ... Insulation tape 54 ... General shield 55 ... Outer tube 60 ... Base 60a ... Abutment surface 60b ... Guide 61 ... restraining member 63 ... jumper wire

Claims (4)

A plurality of coaxial lines each covered by a shield member;
A plurality of simple lines formed by a central conductor and an insulating coating covering the central conductor;
A pedestal that forms a hollow portion, is disposed in a state where the shield members of the plurality of coaxial lines are in contact with an outer peripheral surface , and the plurality of simple lines are inserted into the inner peripheral side of the hollow portion When,
A ring member having elasticity, and a restraining member that sandwiches and bundles the plurality of shield members disposed on the pedestal with the pedestal, and
An endoscope cable module, wherein at least one of the pedestal and the restraining member is formed of a conductive member. A plurality of coaxial lines each covered by a shield member;
A pedestal disposed in a state in which the shield members of the plurality of coaxial wires are in contact with an outer peripheral surface;
A ring member having elasticity, and a restraining member that sandwiches and bundles the plurality of shield members disposed on the pedestal with the pedestal, and
At least one of the pedestal or the restraining member is constituted by a conductive member,
The outer peripheral surface of the said base is comprised by the taper surface which expands toward the front end side.
An endoscope cable module characterized by the above . The cable module of the endoscope according to claim 1 or 2 , wherein an outer peripheral surface of the pedestal has a guide groove for individually routing the coaxial lines. The endoscope cable module according to claim 1 , wherein the pedestal is made of a material highly resistant to laser light.

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