JP2017127464A - Endoscope comprising magnetic sensor unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an endoscope comprising a magnetic sensor unit, which has excellent working efficiency and can maintain strength necessary as an endoscope, while achieving reduction of a diameter of an insertion part.SOLUTION: An endoscope comprises: an insertion part 11 comprising an observation optical system 30; and a magnetic sensor unit 40 comprising a magnetic sensor which is provided in the insertion part 11 along a longitudinal axis, and a cable 42 obtained by putting at least two conductors together. The magnetic sensor comprises a coil part 41 formed by winding a slender conductor wire into a coil-shape by multi layers, a first coil conductive part 44a which extends from a first end side of the longitudinal axis and connected to the first conductor of the cable 42, and a second coil conductive part 44b which extends from a second end side of the longitudinal axis and connected to the second conductor of the cable 42.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an endoscope including a magnetic sensor unit having a magnetic sensor at a distal end portion of an insertion portion.

  Endoscopes are widely used in the medical field or the industrial field in order to perform observation inside a living body, observation inside a structure, or the like. Such an endoscope includes a flexible and elongated insertion portion that is inserted from the outside toward the inside. The insertion portion includes a flexible and elongated flexible tube portion, a bending portion provided on the distal end side thereof, and a hard distal end portion.

  An observation window, an illumination window, and a treatment instrument opening are provided on the distal end surface of the distal end portion. The bending portion is configured to bend in, for example, two directions of up and down, or four directions of up and down, left and right. A user such as a doctor can appropriately operate a bending knob provided on an operation unit disposed on the proximal end side of the insertion unit to bend the bending unit to appropriately view the field of the observation optical system provided at the distal end. A wide range of observations can be made by changing the direction.

  Further, when the user inserts the insertion portion into the bent body cavity, the user performs a procedure for bending the bending portion provided in the insertion portion according to the bending in the body cavity, and a procedure for twisting the insertion portion and the operation portion. It is inserted toward However, the technique of smoothly inserting the insertion portion into the target cavity has been one of the techniques that require skill.

  Patent Document 1 discloses an endoscope position detection coil device that is used to detect the insertion shape and position of an endoscope using a magnetic field. According to the endoscope system including the coil device for detecting the endoscope position, the insertion position can be determined by knowing where the distal end position of the insertion portion is located in the body cavity or the current bending state of the insertion portion. Work becomes easy.

  In recent years, urological endoscopes that conduct observation, treatment, etc. by introducing the insertion portion into a bladder or a luminal organ such as a kidney through a thin lumen such as a ureter have been put into practical use. ing. The diameter of the insertion portion of the urological endoscope is slightly less than 3 to 5 mm, and is smaller than the insertion portion of a large intestine endoscope having a diameter of 12 mm, for example.

  The insertion part of the urological endoscope is inserted transurethrally and then inserted into a complicatedly branched luminal organ such as the kidney cup of the kidney. For this reason, in urological endoscopes, there is a need for an endoscope capable of knowing where in the body cavity the tip position is located in order to reliably guide the thin insertion portion to the target site. .

  On the other hand, the applicant of the present application disclosed in Japanese Patent Application No. 2015-015865, a magnetic sensor unit having a simpler configuration, a satisfactory bending operability, and a configuration capable of maintaining the required strength, and the magnetic sensor unit. The endoscope provided with this is disclosed.

  According to this endoscope, without increasing the diameter of the insertion portion itself, the magnetic sensor unit for detecting the position of the distal end portion of the insertion portion while maintaining good operability such as a bending operation and the necessary strength, It can be placed in the insert.

JP-A-10-75929

However, the first embodiment of the endoscope provided with the magnetic sensor unit disclosed by the applicant of the present application shows a magnetic sensor unit having a configuration in which a coil is arranged separately from the distal end side of the cable. The magnetic sensor unit of this configuration is suitable for realizing a reduction in diameter, but the strength is weak because the coil and the cable are arranged apart from each other, and the external force during assembly or the external force during insertion of the insertion portion Acts between the coil and the cable, there is a possibility that the conductive wires at both ends of the coil respectively joined to the two conductors of the cable may be cut.
On the other hand, the second embodiment shows a magnetic sensor unit having a configuration in which a coil is arranged in parallel along the outer insulation of a cable. In the magnetic sensor unit having this configuration, the coil is integrated with the side portion of the outer insulation of the cable, so that the anxiety with respect to the strength is eliminated, but the outer diameter is larger than that of the first embodiment.

  In both embodiments, the conductive wires at both ends of the coil are extended from one end of the coil and joined to the two conductors of the cable, respectively. For this reason, it is necessary to ensure the insulation between two conducting wires, and the work for ensuring the insulation is a troublesome work.

  The present invention has been made in view of the above circumstances, and is an endoscope provided with a magnetic sensor unit that is excellent in workability and can maintain a necessary strength as an endoscope while realizing a reduction in diameter of an insertion portion. The purpose is to provide.

  An endoscope including a magnetic sensor unit according to one aspect of the present invention includes an insertion portion having an observation optical system, a magnetic sensor disposed in the insertion portion along a longitudinal axis of the insertion portion, and at least two conductors A magnetic sensor unit including a cable in which a plurality of cables are bundled together, and the magnetic sensor of the magnetic sensor unit includes a coil portion obtained by winding a plurality of thin conductive wires in a coil shape, and a first end side of the longitudinal axis. A first coil conductive portion extending to the outside and connected to one conductor of the cable, and a second coil conductive portion extending to the outside from the second end side of the longitudinal axis and connected to the other conductor of the cable And having

  According to the present invention, it is possible to realize an endoscope including a magnetic sensor unit that is excellent in workability while realizing a reduction in the diameter of the insertion portion and can maintain a necessary strength as an endoscope.

External perspective view showing an external appearance of an endoscope provided with a magnetic sensor unit of the present invention The figure explaining the magnetic sensor unit provided in the front-end | tip part vicinity and front-end | tip part of the insertion part of an endoscope Diagram explaining magnetic sensor unit using coaxial cable Sectional view taken along line Y3B-Y3B in FIG. 3A The figure explaining the 1st coil electroconductive part and 2nd coil electroconductive part of a magnetic sensor comprised by winding a conducting wire in multiple layers around a core member The figure explaining the magnetic sensor unit with which the 1st coil electroconductive part, the coil part, and the 2nd coil electroconductive part were surrounded by the binding tool. Sectional view taken along line Y5B-Y5B in FIG. 5A The figure explaining the magnetic sensor unit whose core member which comprises a coil part is pipe shape Sectional view taken along line Y6B-Y6B in FIG. 6A Diagram explaining magnetic sensor unit using twisted pair cable Sectional view taken along line Y7B-Y7B in FIG. 7A

  The present invention will be described below with reference to the illustrated embodiments. Each drawing used in the following description is schematically shown. In order to show each component to the extent that it can be recognized on the drawing, the dimensional relationship and scale of each member are shown differently for each component. There may be. Therefore, the present invention is limited to the illustrated embodiments with respect to the number of components, the shape of the components, the size ratio of the components, the relative positional relationship of the components, and the like described in the drawings. It is not something.

A configuration of an endoscope including the magnetic sensor unit of the present embodiment will be described.
As shown in FIG. 1, an endoscope 10 having a magnetic sensor unit is a urological endoscope, and guides an insertion portion 11 into a luminal organ such as a kidney via a ureter, for example. A nephroscope that observes and treats internal organs.
The endoscope 10 mainly includes a thin insertion portion 11, an operation unit 12, and a universal cord 13.

  The insertion portion 11 includes a distal end portion 14 made of a hard member, a bending portion 15 configured to bend in the vertical direction, and a flexible tube portion 16 that is a flexible tube body from the distal end side. They are arranged in series.

  An operation portion 12 is provided on the proximal end side of the flexible tube portion 16. The flexible tube portion 16 is a tubular member having an elongated flexibility. Reference numeral 17 denotes a bend preventing portion having a predetermined elastic force. The bend preventing portion 17 is provided so as to cover the proximal end portion of the flexible tube portion 16, prevents buckling of the flexible tube portion 16, and prevents the flexible tube portion 16 from being connected to the distal end side of the operation portion 12. Maintains water tightness between.

  The universal cord 13 extends from the side of the operation unit 12. A light guide connector (not shown) is provided at the base end of the universal cord 13. An electric cable (not shown) extends from the side of the light guide connector. The light guide connector is connected to a light source device that is an external device, and an electrical connector (not shown) provided at the end of the electrical cable is electrically connected to a control unit that is an external device. It has become so.

  The operation unit 12 is provided with, for example, an L-shaped bending operation lever 18, a T-shaped tube attachment port 19, a remote switch 20, a suction port (not shown), and the like. The bending operation lever 18 is pivotally supported with respect to the operation unit 12. The bending operation lever 18 is an operation member for performing a bending operation on the bending portion 15.

  A T-shaped tube (not shown) is attached to the T-shaped tube mounting port 19. The T-shaped tube is provided with a coupling cap portion that serves as a coupling portion with the T-tube mounting port 19, a treatment instrument insertion port provided with a forceps plug, and a tube cap portion connected with a water supply tube. Therefore, it is possible to feed water through the T-tube and introduce the treatment instrument into the organ.

  The suction port is provided on a surface (not shown) on the opposite side (also referred to as the back side) of the operation unit 12 provided with the bending operation lever 18. In addition to the remote switch described above, a remote switch is provided on the opposite surface of the operation unit 12. These remote switches are switches for stopping or recording an endoscope image displayed on the screen of a display device (not shown), recording, enlarging an image, switching illumination light, and the like.

The bending portion 15 is configured to bend in two directions up and down in accordance with the turning operation of the bending operation lever 18 of the operation portion 12. One end of a bending operation wire (not shown) is connected to the bending operation lever 18. The bending operation wire is inserted through the inside of the operation unit 12, the flexible tube unit 16 and the bending unit 15, and the other end portion of the distal bending piece constituting the bending unit 15 (see reference numeral 15 a in FIG. 2). It is connected to a predetermined part.
When the surgeon rotates the bending operation lever 18, the bending operation wire is pulled and loosened, and the bending portion 15 is bent upward or downward.

Note that the distal end surface of the distal end portion 14 of the insertion portion 11 is provided with an observation window (see reference numeral 34a in FIG. 2), an unillustrated illumination window, a treatment instrument opening, and the like. Further, a magnetic sensor unit (see reference numeral 40 in FIG. 2) described later is provided along the longitudinal axis of the insertion portion 11 inside the insertion portion 11. For example, a coaxial cable (see reference numeral 42 in FIG. 2) is extended from the magnetic sensor unit 40 as a cable. The coaxial cable 42 is inserted through the inside of the insertion portion 11, the inside of the operation portion 12, the inside of the universal cord 13, and the inside of the electric cable, and an end portion thereof is disposed in the electric connector.
As a result, the magnetic sensor unit and the control unit (not shown) of the control unit are electrically connected by connecting the electrical connector to the control unit.

  As shown in FIG. 2, the distal end hard member 14H constituting the distal end portion 14 is provided with an observation optical system through hole 14a and a magnetic sensor unit disposing portion 14b. An observation optical system 30 is disposed in the observation optical system through hole 14a, and a magnetic sensor unit 40 is disposed in the magnetic sensor unit disposition portion 14b. Reference numeral 15a denotes a tip bending piece, which is integrally fixed to the tip hard member 14H.

  Although illustration and description are omitted, the distal end rigid member 14H is provided with an illumination optical system through hole and a treatment instrument channel hole in parallel with the observation optical system through hole 14a. Further, inside the insertion portion 11, an illumination bundle that transmits illumination light to the illumination window, a treatment instrument channel tube that communicates the treatment instrument opening with the T-shaped tube attachment port 19 and the suction port, and the upper and lower bending operations A wire or the like is inserted.

  The observation optical system 30 shown in FIG. 2 is an image pickup apparatus 31 having an image pickup element 31a. The imaging device 31 includes an optical unit 32 that is an objective optical system and an element unit 33 that is an imaging optical system. The optical unit 32 includes, for example, an optical member such as a plurality of optical lenses 34, a plurality of diaphragms 35, and a spacing ring (not shown), and a lens frame made of, for example, stainless steel that fixes the optical lenses 34, the diaphragm 35, and the spacing ring. 36A. Reference numeral 34a denotes a front-end optical lens, which is an observation window, and is integrally fixed to the lens frame 36A by bonding or bonding.

  On the other hand, the element unit 33 includes an image pickup element 31a, an element frame 36B, a circuit board 37, and a signal cable 38. The image sensor 31a is a CCD, a CMOS, or the like. For example, a prism 39p, which is an optical member, is bonded and fixed to the light receiving surface 31s of the imaging element 31a with a transparent adhesive. Reference numerals 39a and 39b are cover lenses. The base end side surface of the first cover lens 39a is bonded and fixed to the front end side plane of the prism 39p with a transparent adhesive, and the base end side surface of the second cover lens 39b is transparently bonded to the front end side surface of the first cover lens 39a. It is bonded and fixed by the agent.

  Reference numeral 38 a is a signal line, and a plurality of signals 38 a are inserted into the signal cable 38. Each signal line 38 a is electrically connected to a contact portion (not shown) provided at a predetermined portion on the circuit board 37. Reference numeral 37 a denotes an electronic component that is mounted on the circuit board 37. On the circuit board 37, electronic components (not shown) are mounted in addition to the electronic components 37a.

On the other hand, the magnetic sensor unit 40 of the present embodiment is arranged along the longitudinal direction of the insertion portion 11 in the magnetic sensor unit arrangement portion 14b of the distal end hard member 14H.
The magnetic sensor unit 40 is mainly composed of a coil portion 41 and a coaxial cable 42. In FIG. 2, reference numeral 44a is a first coil conductive portion, reference numeral 44b is a second coil conductive portion, reference numeral 49 is a bundling tube, reference numeral 50 is an exterior tube, and reference numerals 51 and 52 are sealing resins. And will be described later.

  The coil part 41 is a main part of the magnetic sensor. As shown in FIGS. 3A, 3B, and 4, a core member 43 that is a solid and cylindrical metal rod having a predetermined diameter is used. And a conductive wire 44 that is a thin and long metal wire to be wound.

  The conducting wire 44 is very thin and is wound around the outer peripheral surface of the core member 43 in a plurality of layers in a coil shape. The first coil conductive portion 44 a is on one end side of the conductive wire 44, and the second coil conductive portion 44 b is on the other end side of the conductive wire 44.

  As shown in FIG. 4, the elongated conductive wire 44 is wound in a coil shape from the first end 43 a side which is one end of the core member 43 toward the second end 43 b side which is the other end along the outer peripheral surface. One winding part 41a is formed. Here, the conducting wire 44 extended in a predetermined length from the first end 43a side of the core member 43 toward the outside constitutes the first coil conductive portion 44a.

  The conducting wire 44 forming the first winding portion 41a along the outer peripheral surface of the core member 43 is folded back on the second end 43b side, and then the first end 43a along the outside of the first winding portion 41a. The second winding part 41b is laminated and formed in a coil shape toward the side.

  The conductive wire 44 is folded back leaving the exposed portion 44c of a predetermined distance L on the first end 43 side of the first winding portion 41a, and then the second end 43b side along the outside of the second winding portion 41b. The third winding portion 41c is laminated and formed in a coil shape toward the head. Thereafter, the conducting wire 44 is folded back at the second end 43b of the second winding portion 41b, wound in a coil shape toward the first end 43a along the outer side of the third winding portion 41c, and is fourth. After winding part 41d is laminated and folded at first end 43a of third winding part 41c, it is wound in a coil shape toward second end 43b along the outer side of fourth winding part 41d. As a result, the fifth winding portion 41e is laminated.

And the conducting wire 44 which formed this 5th winding part 41e is extended in the predetermined length toward the exterior from the 2nd end 43b side, and becomes the 2nd coil electroconductive part 44b.
In addition, in FIG. 4, although the conducting wire 44 is wound and the structure which laminates | stacks five winding parts is shown, the lamination | stacking number of winding parts is not limited to five layers, Even if it is more than that It may be less than that.

  The coaxial cable 42 is a flexible signal line and transmits an input / output signal of the coil unit 41. The coaxial cable 42 includes a first conductor 45 disposed along the central axis, a first insulator 46 surrounding the first conductor 45, and a first conductor sandwiching the first insulator 46. The second conductor 47 arranged side by side with the second conductor 47 and the second insulator 48 surrounding the second conductor 47 are collectively formed. The second insulator 48 is a skin insulator that is a skin of the coaxial cable 42.

  The coaxial cable 42 of the present embodiment is provided with a first wiring portion 45a, a coil mounting portion 46a, and a second wiring portion 47a. The first wiring portion 45a, the coil attachment portion 46a, and the second wiring portion 47a are arranged in the longitudinal direction in order from the cable tip 42a side of the coaxial cable 42.

  The first wiring portion 45a exposes the first conductor 45 by removing a predetermined amount of the first insulator 46, the second conductor 47, and the second insulator 48 of the coaxial cable 42 from the cable tip 42a. It is the made 1st conductor exposure part. The first coil conductive portion 44a of the coil portion 41 is disposed in the first wiring portion 45a.

  The coil mounting portion 46a removes a predetermined amount of the second conductor 47 and the second insulator 48 provided on the base end side of the first wiring portion 45a from the base end of the first wiring portion 45a. This is a first insulator exposing portion where the first insulator 46 is exposed. The coil portion 41 is disposed over the entire length of the coil attachment portion 46a.

  The second wiring portion 47a removes the second insulator 48 provided on the base end side of the coil mounting portion 46a from the base end of the coil mounting portion 46a in a predetermined amount to expose the second conductor 47. The second conductor exposed portion. The second coil conductive portion 44b of the coil portion 41 is disposed in the second wiring portion 47a.

  The first coil conductive portion 44a of the coil portion 41 disposed in the first wiring portion 45a and the second coil conductive portion 44b of the coil portion 41 disposed in the second wiring portion 47a are respectively made of conductive adhesive, solder, or the like. The connection is fixed by.

  On the other hand, the coil portion 41 disposed on the outer side portion of the coil attachment portion 46a is integrally fixed to the outer portion of the coil attachment portion 46a by a binding tube 49 that is an annular heat-shrinkable tube that is a binding tool. .

In this configuration, the outer tube 50, which is a pipe-shaped heat-shrinkable tube, may be enclosed on the distal end side as shown in FIGS. 3A and 3B for reinforcing the distal end side of the coaxial cable 42 provided with the coil portion 41. Then, the gap between the outer tube 50 and the first conductor 45 constituting the first wiring portion 45a is filled with the first sealing resin 51, and the second conductor constituting the outer tube 50 and the second wiring portion 47a. A second sealing resin 52 is filled in a gap between the first sealing resin 52 and the second sealing resin 52. The sealing resins 51 and 52 are insulating adhesives.
Thus, by filling the gaps with the sealing resins 51 and 52, the first coil conductive portion 44a and the second coil conductive portion 44b are prevented from being disconnected, and the conductive portions 44a and 44b and the wiring portion 45a. , 47a are protected.

The magnetic sensor unit 40 configured in this manner generates magnetism in the vicinity of the coil portion 41 by passing a current through the conducting wire 44 using the control unit. By detecting the generated magnetism with a detection device (not shown), the position in the vicinity of the distal end portion of the insertion portion 11 can be detected. That is, even when the insertion portion 11 is introduced into a body cavity, for example, the position near the distal end portion of the insertion portion 11 can be detected as described above.
On the contrary, the magnetic sensor unit 40 may be used as the receiving side to detect magnetism generated from a device (not shown) to detect the position near the distal end of the insertion portion 11.

  According to the magnetic sensor unit 40 of the present embodiment, the coil portion 41 is disposed along the coil attachment portion 46a where the first insulator 46 of the coaxial cable 42 is exposed. As a result, the outer shape can be reduced as compared with the configuration in which the coil portion 41 is disposed along the second insulator 48 of the coaxial cable 42. As a result, the diameter of the insertion portion 11 can be reduced.

Further, according to the magnetic sensor unit 40 of the present embodiment, the first wiring portion 45a is provided on the distal end side of the coil attachment portion 46a of the coaxial cable 42, and the second wiring portion 47a is provided on the proximal end side of the coil attachment portion 46a. Provided. On the other hand, the coil portion 41 includes a first coil conductive portion 44a extending from the first end 43a side of the core member 43 and a second coil conductive portion 44b extending from the second end 43b side.
As a result, the handling work when connecting the conductive portions 44a and 44b to the corresponding wiring portions 45a and 47a is facilitated, and reliable insulation and strong connection and fixation can be realized.

  In addition, after the coil portion 41 is arranged along the coil attachment portion 46a of the coaxial cable 42, the coil portion 41 is connected to the first insulator 46 of the coaxial cable 42 by a bundling tube 49 as shown in FIGS. 3A and 3B. As a result of being fixed integrally, it is possible to realize a strong connection and a further improvement in strength resistance.

  Instead of the bundling tube 49, the coil portion 41 may be integrally fixed to the first insulator 46 of the coaxial cable 42 using an adhesive as a bundling tool.

Moreover, in the structure which winds the conducting wire 44 on the outer peripheral surface of the core member 43 which comprises the coil part 41, and provides the winding part of several layers, the exposed part of the distance L to the 1st end 43a side of the 1st winding part 41a 44c is provided. As a result, even if an operation error occurs during the operation of connecting the first coil conductive portion 44a to the first wiring portion 45a, a new first is obtained by removing the lead wire 44 of the exposed portion 44c from the core member 43. The correction work can be performed by causing the coil conductive portion 44a to appear.
As for the second coil conductive portion 44b, if an operation error occurs during the operation of connecting the conductive portion 44b to the second wiring portion 47a, a new first wire is released by unraveling the lead wire 44 provided on the outermost periphery. The two-coil conductive portion 44b appears and correction work can be performed.
As a result, the workability can be further improved.

  Further, the distal end side portion of the coaxial cable 42 provided with the coil portion 41 is arranged in the distal end side hard portion constituted by the distal end rigid member 14H and the distal end bending piece 15a. As a result, the bending external force applied during the bending operation or the like is only applied to the flexible and flexible coaxial cable 42, and the external force is applied to the connecting portion between the first coil conductive portion 44a and the first wiring portion 45a. In addition, the connecting portion between the second coil conductive portion 44b and the second wiring portion 47a is not applied. As a result, it is possible to realize a high-strength magnetic sensor unit 40 with excellent bending resistance by avoiding the influence of external force.

Here, another configuration example of the magnetic sensor unit will be described with reference to FIGS. 5A and 5B and FIGS. 6A and 6B.
Another configuration example of the magnetic sensor unit will be described with reference to FIGS. 5A and 5B.
5A and 5B includes a bundling outer tube 53 instead of the bundling tube 49 and the outer tube 50 that the magnetic sensor unit 40 has. The bundling outer tube 53 is a bundling tool that combines the bundling tube 49 and the outer tube 50 and is a heat-shrinkable tube. The bundling outer tube 53 integrally fixes the coil portion 41 to the outer side of the coil mounting portion 46a similarly to the bundling tube 49 described above, and the coaxial cable 42 provided with the coil portion 41 similarly to the outer tube 50 described above. Enclose the tip side of.

And like embodiment mentioned above, while filling sealing resin 51 and 52 into a clearance gap, while preventing the 1st coil conductive part 44a and the 2nd coil conductive part 44b from being disconnected, the conductive parts 44a and 44b and The connection part with the wiring parts 45a and 47a is protected.
According to this configuration, the overlapping of the bundling tube 49 and the outer tube 50 as shown in FIG. 3B is eliminated, and the maximum outer shape of the magnetic sensor unit 40A is made smaller than the maximum outer shape of the magnetic sensor unit 40 described above. Can do. As a result, the insertion portion 11 can be further reduced in diameter.

  In addition, the coil part 41 is attached to the coil without using the bundling tube 49, the outer tube 50, and the bundling outer tube 53 shown in the embodiment of FIGS. 3A and 3B described above and the embodiment of FIGS. 5A and 5B. The structure which apply | coats an adhesive agent to the outer side part of the part 46a, and fixes integrally may be sufficient.

Another configuration example of the magnetic sensor unit will be described with reference to FIGS. 6A and 6B.
The magnetic sensor unit 40B shown in FIGS. 6A and 6B includes a pipe-shaped core member 43P instead of the core member 43 that the magnetic sensor units 40 and 40A have.
The pipe-shaped core member 43P is a metal circular pipe having a cylindrical shape and a circular through hole 43h that is a central through hole. The inner diameter of the circular through hole 43h is larger than the outer diameter of the first insulator 46, and the coil attachment portion 46a can be inserted and disposed in the circular through hole 43h. The coil attachment portion 46a disposed in the circular through hole 43h is integrally fixed to the pipe-shaped core member 43P by adhesion.
And in this embodiment, the conducting wire 44 is wound around the outer peripheral surface side of the pipe-shaped core member 43P, for example, five layers of winding parts are laminated.

Reference numeral 54 denotes an exterior tube, which surrounds the coaxial cable 42 and the distal end side of the coil portion 41 and serves as a binding tool. Further, as in the above-described embodiment, the sealing resins 51 and 52 are filled in the gap to prevent the first coil conductive portion 44a and the second coil conductive portion 44b from being disconnected, and the conductive portions 44a and 44b The connection part with the wiring parts 45a and 47a is protected.
Other configurations and operations are the same as those of the above-described embodiment, and the same members are denoted by the same reference numerals and description thereof is omitted.

  According to this configuration, the first insulator 46 of the coaxial cable 42 is disposed in the circular through hole 43h of the pipe-shaped core member 43P, so that the coil portion 41 is arranged in parallel with the coil attachment portion 46a of the coaxial cable 42. Compared to the configuration in which the tie is fixed later, the workability is further improved, and reliable insulation and strong connection and fixation can be easily realized, and further improvement in strength resistance can be realized.

  In addition, the outer diameter of the pipe-shaped core member 43P having the circular through hole 43h in which the first insulator 46 can be disposed is smaller than the width when the coil portion 41 is arranged in parallel with the coil mounting portion 46a. By forming, the outer shape of the magnetic sensor unit 40B can be made smaller than that of the magnetic sensor unit 40A. As a result, the insertion portion 11 can be further reduced in diameter.

  In this embodiment, the structure using the pipe-shaped core member 43P which has the circular through-hole 43h in which the coil attachment part 46a can be inserted-positioned instead of the core member 43 was shown. However, the coil portion 44 is formed as a hollow coil having a through-hole without providing the core members 43 and 43P, and the coil mounting portion 46a is disposed in the through-hole to obtain the same operation and effect as the above-described embodiment. You may do it.

  In the embodiment described above, the magnetic sensor units 40, 40 </ b> A, 40 </ b> B are configured to include the coaxial cable 42. However, the cable is not limited to the coaxial cable 42 and may be the twisted pair cable 60 shown in FIGS. 7A and 7B.

  The twisted pair cable 60 includes a first electric cable 61, a second electric cable 62, and an insulating coating 63. A first electric cable 61 and a second electric cable 62 are inserted into the insulating coating 63 in a twisted state.

  The first electric cable 61 includes a first conductor 61a and an insulating tube 61b through which the first conductor 61a is inserted. On the other hand, the second electric cable 62 includes a second conductor 62a and an insulating tube 62b through which the second conductor 62a is inserted. The insulating coating 63 is an insulating sheath.

  In the present embodiment, a predetermined amount is removed from the distal end which is one end side of the insulating sheath 63. As a result, the two electric cables 61 and 62 are exposed from the removal end 63a of the insulating sheath 63, respectively.

  The exposure amount of the first electric cable 61 and the exposure amount of the second electric cable 62 are different. Specifically, the length of the first electric cable 61 is such that the tip of the first electric cable 61 is positioned in the vicinity of the first coil conductive portion 44a of the coil portion 41, and the tip of the second electric cable 62 is positioned in the vicinity of the second coil conductive portion 44b. (Exposure amount) is set.

  The first electric cable 61 is provided with a first conductor 61a serving as a first wiring portion, and the second electric cable 62 is provided with a second conductor 62a serving as a second wiring portion. Yes. A part of the distal end side of the insulating tube 61 b of the first electric cable 61 is a coil attachment portion 64.

  The first conductor 61a is exposed by removing a predetermined amount of the distal end side of the insulating tube 61b, and the second conductor 62a is exposed by removing a predetermined amount of the distal end side of the insulating tube 62b. The exposed first conductor 61a is connected to the first coil conductive portion 44a of the coil portion 41, and the exposed second conductor 62a is connected to the second coil conductive portion 44b of the coil portion 41.

And when the coil part 41 is the core member 43, the coil part 41 is arrange | positioned over the full length in the coil attachment part 64, and when the coil part 41 is the pipe-shaped core member 43P or a hollow coil, illustration is carried out. Although omitted, the coil attachment portion 64 is disposed in the through hole.
Other configurations are the same as those of the above-described embodiment, and the same members are denoted by the same reference numerals and description thereof is omitted. According to this configuration, the same operations and effects as those of the above-described embodiment can be obtained.

  In addition, although the endoscope provided with the magnetic sensor unit to which the present invention is applied has been described by taking a nephroscope as an example, the form of the endoscope to which the present invention can be applied is limited to this. Rather, for example, if the endoscope has a configuration including the bending portion 15 and the flexible tube portion 16 and the insertion portion 11 configured to have flexibility, other applications and other forms are possible. Even if it is a thing, this invention is applicable similarly.

  The present invention is not limited to the above-described embodiments, and various modifications and applications can be implemented without departing from the spirit of the invention.

  The present invention can be applied not only to endoscopes in the medical field but also to endoscopes in the industrial field.

DESCRIPTION OF SYMBOLS 10 ... Endoscope 11 ... Insertion part 12 ... Operation part 13 ... Universal cord 14 ... Tip part 14H ... Tip hard member 14a ... Through-hole for observation optical systems
14b: Magnetic sensor unit arrangement portion 15: Bending portion 15a ... Tip bending piece 16 ... Flexible tube portion 17 ... Bending portion 18 ... Bending operation lever 19 ... T-shaped tube mounting port 20 ... Remote switch 30 ... Observation optical system 31 Image pickup device 31a Image pickup element 31s Light receiving surface 32 Optical unit 33 Element unit 34 Optical lens 36A Lens frame 36B Element frame 37 Circuit board 37a Electronic component 38 Signal cable 38a Signal line 39a 1 cover lens 39b ... second cover lens 39p ... prism
40, 40A, 40B ... Magnetic sensor unit 41, 41B ... Coil portion 42 ... Coaxial cable 42a ... Cable tip 43 ... Core member 43a ... First end 43b ... Second end 43P ... Pipe-like core member 43h ... Circular through-hole 44 ... Conductor 44a ... first coil conductive portion 44b ... second coil conductive portion 44c ... exposed portion 45 ... first conductor 45a ... first wiring portion 46 ... first insulator 46a ... coil mounting portion 47 ... second conductor 47a ... 2nd wiring part 48 ... 2nd insulator 49 ... Bundling tube 50 ... Exterior tube 51 ... 1st sealing resin 52 ... 2nd sealing resin 53 ... Bundling exterior tube 54 ... Exterior tube

Claims (10)

An insertion portion having an observation optical system, and a magnetic sensor unit including a cable in which at least two conductors are bundled together and a magnetic sensor disposed along the longitudinal axis of the insertion portion in the insertion portion,
The magnetic sensor of the magnetic sensor unit is:
A coil portion obtained by winding a plurality of thin conductive wires in a coil shape;
A first coil conductive portion extending to the outside from the first end side of the longitudinal axis and connected to one conductor of the cable;
An endoscope including a magnetic sensor unit, comprising: a second coil conductive portion extending outward from a second end side of the longitudinal axis and connected to the other conductor of the cable. The cable is
A first conductor disposed along the central axis, a first insulator surrounding the first conductor, and a second conductor arranged in parallel to the first conductor with the first insulator interposed therebetween A coaxial cable having a second conductor and a second insulator surrounding the second conductor,
A first wiring portion constituted by exposing the first conductor to which the first coil conductive portion is connected in order from the one end side to the one end side of the coaxial cable, the first coil portion being disposed. A coil mounting portion constituted by exposing an insulator and a second wiring portion constituted by exposing the second conductor to which the second coil conductive portion is connected are arranged in the longitudinal direction. An endoscope comprising the magnetic sensor unit according to claim 1. The first wiring portion removes the second insulator, the second conductor, and the second insulator, and exposes a predetermined amount of the first conductor to the distal end side of the coaxial cable. Provided,
The coil mounting portion exposes a predetermined amount on the proximal end side of the first wiring portion by removing the second insulator and the second conductor closer to the proximal end side than the first wiring portion. Provided,
The second wiring part is provided by removing the second insulator on the base end side of the coil mounting part and exposing a predetermined amount on the base end side of the coil mounting part. An endoscope comprising the magnetic sensor unit according to claim 2. The cable is a twisted pair cable having two electric cables each having an insulating tube and a conductor inserted into the insulating tube, and an insulating coating that covers the two electric cables in a twisted state. Because
Removing the insulating coating on one end of the twisted pair cable to expose the two electric cables having different lengths;
A first wiring portion in which the insulating tube is removed to expose one conductor is provided on the distal end side of the first electric cable having a large exposure amount, and the distal end side of the second electric cable having a smaller exposure amount than the first electric cable. The endoscope provided with the magnetic sensor unit according to claim 1, further comprising: a second wiring portion in which the other conductor is exposed by removing the insulating tube.   The endoscope having a magnetic sensor unit according to claim 3, wherein the coil portion is integrally fixed to the coil attachment portion by a binding tool.   The endoscope having a magnetic sensor unit according to claim 5, wherein the binding tool surrounds the first coil conductive portion and the second coil conductive portion in addition to the coil portion.   The endoscope having the magnetic sensor unit according to claim 2, wherein the coil portion is formed by winding the conductive wire around the core member in a plurality of layers in a coil shape. The core member is a circular pipe having a circular through hole or a hollow coil,
The endoscope having a magnetic sensor unit according to claim 2, wherein the coil attachment portion is inserted and disposed in a circular through hole of the core member.   The endoscope having a magnetic sensor unit according to claim 8, wherein, in addition to the coil portion, the first coil conductive portion and the second coil conductive portion are surrounded by a binding tool.   The endoscope provided with the magnetic sensor unit according to claim 5, wherein the binding tool is a heat-shrinkable tube.

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