JP6204872B2 - Endoscope - Google Patents

Description

  The present invention relates to an endoscope having a treatment instrument insertion channel extending between an operation section and an in-vivo insertion section.

  By providing a treatment instrument insertion channel extending between the operation section and the body insertion section and introducing various treatment instruments into the body of the subject through the treatment instrument insertion channel, various diagnosis and treatment can be performed. An endoscope is known.

  The distal end side of the treatment instrument insertion channel communicates with a channel opening formed at the distal end portion of the body insertion portion, and the proximal end side of the treatment instrument insertion channel passes through the channel branching portion, and one of them is a treatment portion of the operation portion. It communicates with the instrument insertion port, and the other communicates with the suction conduit. The suction line is connected to a suction device so that the body fluid of the subject can be sucked and removed from the channel opening.

  Generally, a luer base (a base member) for mounting the treatment tool is attached to the treatment tool insertion port. As a representative treatment instrument attached to a luer base, a treatment instrument attachment for introducing a puncture needle of a puncture needle device for an ultrasonic endoscope is known. The attachment is screwed and fixed to the luer base by a double thread structure, and a puncture needle is introduced from the treatment instrument insertion port through the treatment instrument attachment.

Japanese Patent Publication No. 4-17649

  However, according to the diligent research of the present inventor, in the conventional endoscope, due to the screwing pressure (torque) repeatedly applied every time the treatment tool (treatment tool attachment) is attached to the luer base. The following technical problems were found to occur.

  That is, in the conventional endoscope, the metal luer base is supported by the resin collar member provided at the base end portion on the operation part side of the treatment instrument insertion channel, and the lure base D By fitting the cut fitting portion and the D-cut fitting hole (non-circular convex fitting portion and non-circular concave fitting hole) of the collar member to each other, the two members have a function of preventing rotation.

  However, as described above, the luer base having the D-cut fitting portion is made of metal, and the collar member having the D-cut fitting hole is made of resin, so that the treatment tool (treatment tool attachment) is attached to the luer base. Due to the screwing pressure (torque) repeatedly applied each time the collar is mounted, the D-cut fitting hole of the collar member is broken, and a problem occurs in which the luer base rotates relative to the collar member. More specifically, among the D-cut fitting holes of the collar member, the boundary edge portion between the curved surface portion and the flat surface portion (two boundary edge portions that face each other without being adjacent in the circumferential direction among the four boundary edge portions) ), The D-cut fitting hole is scraped off (digged in) starting from this boundary edge portion.

  The present invention has been made on the basis of the above problem awareness, and by disperse the screwing pressure (torque) repeatedly applied every time a treatment instrument (treatment instrument attachment) is attached to the base member, It is an object of the present invention to obtain an endoscope that can prevent the failure of the collar member to be supported and thus the base member from rotating relative to the collar member.

  The endoscope of the present invention includes a treatment instrument insertion channel extending between an operation section and an in-body insertion section; a resin-made color member provided at a proximal end portion of the treatment instrument insertion channel on the operation section side; and the resin A metal base member coaxially supported by the treatment instrument insertion channel on the collar member made of metal, and the metal base member and the resin collar member are fitted to each other in a non-circular convex fitting portion And the endoscope having a non-circular concave fitting hole, the non-circular convex fitting portion includes a circular convex cylindrical surface formed of a part of a cylindrical surface centering on an axis of the metal base member, The non-existing portion of the circular convex cylindrical surface has a plurality of detent protrusions protruding outward in the radial direction of the extended surface of the circular convex cylindrical surface (a virtual cylinder including the circular convex cylindrical surface). And the non-circular concave fitting holes are mutually corresponding to the circular convex cylindrical surface. A radially concave cylindrical surface that engages and an outer surface of the circular concave cylindrical surface that engages with each other in correspondence with the plurality of detent projections (a virtual cylinder including the circular concave cylindrical surface) in the radial direction And a plurality of non-rotating recesses protruding in the direction.

  It is preferable that the plurality of anti-rotation convex portions and the plurality of anti-rotation concave portions have a semi-cylindrical shape whose axis is parallel to the axis of the metal base member.

  It is preferable that the plurality of anti-rotation convex portions and the plurality of anti-rotation concave portions are formed rotationally symmetrical with respect to the axis of the metal base member.

  The plurality of detent projections are composed of a plurality of column pins made of a member different from the metal base member, and the plurality of column pins for fitting the plurality of column pins to the metal base member Support holes can be formed.

  It is preferable that the diameter portion of the plurality of cylindrical pin support holes is located inside the extended surface of the circular convex cylindrical surface.

  According to the endoscope of the present invention, the screwing pressure (torque) repeatedly applied every time the treatment tool (treatment tool attachment) is attached to the base member is dispersed, so that the collar member supporting the base member is destroyed. A problem that the base member rotates relative to the collar member can be prevented.

1 is a diagram illustrating an overall configuration of an ultrasonic endoscope according to a first embodiment of the present invention. It is a perspective view which expands and shows the treatment tool penetration part of a holding | grip operation part. It is a 1st perspective view which shows the state which assembled | attached the collar member to the treatment part insertion part of a holding | grip operation part. It is a 2nd perspective view which shows the state which assembled | attached the collar member to the treatment part insertion part of a holding | grip operation part. It is a perspective view which shows the state which assembled | attached the collar member and the lure base to the treatment part insertion part of a holding | grip operation part. It is a figure which expands and shows the fitting part of the non-circular convex fitting part of a lure mouthpiece, and the non-circular concave fitting hole of a collar member. It is a perspective view which shows the state which assembled | attached the collar member, the lure mouthpiece, and the retainer member to the treatment part insertion part of a holding | grip operation part. It is sectional drawing which follows the VIII-VIII line of FIG. It is a perspective view which shows the state before attaching a collar member, a luer base, and a retainer member to the treatment part insertion part of a holding | grip operation part. It is a perspective view which shows the state before making a some cylindrical pin and the some cylindrical pin support hole of a lure base fit. It is a perspective view which shows the state after making a some cylindrical pin and the some cylindrical pin support hole of a lure base fit. It is a perspective view corresponding to FIG. 10 and FIG. 11 which shows 2nd Embodiment of this invention.

(First embodiment)
With reference to FIGS. 1-11, the ultrasonic endoscope (endoscope) 10 by 1st Embodiment of this invention is demonstrated. In the front-rear direction of the ultrasonic endoscope 10 in the following description, the distal end side of the in-vivo insertion portion 30 is “front”, and the distal ends of the universal tube 40 and the ultrasonic image transmission tube 50 are “rearward”.

  As shown in FIG. 1, the ultrasonic endoscope 10 includes a grip operation unit (operation unit) 20 that an operator grips, and a flexible in-vivo insertion unit 30 that extends forward from the grip operation unit 20. The universal tube 40 and the ultrasonic image transmission tube 50 are branched from the grip operation unit 20 and extended backward. The in-body insertion portion 30 includes a distal end rigid portion 31, a bending portion 32, and a flexible tube portion 33 in order from the distal end side. A connector portion (not shown) is provided at the distal end portion of the universal tube 40, and this connector portion can be connected to an electronic endoscope processor (not shown). A connector portion (not shown) is provided at the distal end portion of the ultrasonic image transmission tube 50, and this connector portion can be connected to an ultrasonic diagnostic apparatus (not shown). Both the electronic endoscope processor and the ultrasonic diagnostic apparatus are connected to a monitor (not shown).

  The ultrasound endoscope 10 has a light guide fiber (not shown) built therein, and the light guide fiber is inserted into the body insertion portion 30 (the distal end rigid portion 31, the bending portion 32, the flexible tube portion 33), and the grip. The light guide sleeve (not shown) protrudes from the connector provided at the tip of the universal tube 40 through the operation unit 20 and the universal tube 40. When the connector portion provided at the distal end portion of the universal tube 40 is connected to the electronic endoscope processor, the light guide fiber is optically connected to a light source lamp (not shown) built in the electronic endoscope processor. Connected to. Then, the illumination light emitted from the light source lamp is guided through the light guide fiber, and is emitted with a predetermined light distribution by an illumination lens (not shown) provided on the front end surface of the distal end hard portion 31 of the body insertion portion 30. Is emitted in the direction.

  An objective lens (not shown) that captures subject light is provided on the front end surface of the distal end rigid portion 31 of the in-vivo insertion portion 30, and immediately after that, an image sensor (not shown) that acquires an image signal of the subject. Is provided. The image signal of the subject acquired by the image sensor is transmitted via a signal transmission cable (not shown) and output to an image processing unit (not shown) of the processor for electronic endoscope. The image processing unit performs predetermined image processing on the input image signal to obtain a captured image, which is displayed on a monitor and stored in an image memory (not shown).

  As shown in FIG. 1, an ultrasonic probe 55 having a ring shape in front view is attached to the distal end rigid portion 31 of the in-vivo insertion portion 30. The ultrasonic probe 55 is configured by, for example, integrating a ring-shaped backing material, a piezoelectric element, and an acoustic lens by overlapping in the radial direction. Ultrasonic diagnosis is performed by transmitting the ultrasonic image acquired by the ultrasonic probe 55 to the ultrasonic diagnostic apparatus via the ultrasonic image transmission tube 50.

  The grip operation unit 20 is provided with a bending operation lever 21, a suction button 22, and an air / water supply button 23. The bending operation lever 21 is a lever for bending the bending portion 32 of the body insertion portion 30 in the vertical and horizontal directions. The suction button 22 is a button for sucking and removing the body fluid of the subject from a channel opening (not shown) provided in the distal end hard portion 31 of the body insertion portion 30. The air / water supply button 23 is a button for supplying air / water to an objective lens or an illumination lens (not shown) provided on the distal end rigid portion 31 of the internal insertion portion 30.

  The ultrasonic endoscope 10 has a treatment instrument insertion channel 60 extending between the grasping operation unit 20 and the in-body insertion unit 30. The distal end side of the treatment instrument insertion channel 60 communicates with a channel opening (not shown) provided in the distal end rigid portion 31 of the body insertion portion 30. The proximal end side of the treatment instrument insertion channel 60 is connected to a treatment instrument insertion section 70 projecting from the grasping operation section 20 through the channel branch section 62 and the other is connected to a suction device (not shown). The suction pipe 64 communicates. By operating the suction button 22 to operate the suction device, the body fluid of the subject can be sucked and removed from the channel opening provided in the distal end rigid portion 31 of the body insertion portion 30.

  The treatment instrument insertion portion 70 projecting from the grasping operation portion 20 has a cylindrical shape for inserting a flexible puncture needle (not shown) into the treatment instrument insertion channel 60. The puncture needle inserted into the treatment instrument insertion channel 60 from the treatment instrument insertion section 70 is protruded outward from the distal end opening of the treatment instrument insertion channel 60 (the channel opening provided in the distal end rigid portion 31 of the body insertion section 30). be able to. FIG. 1 illustrates a state where the treatment instrument insertion portion 70 is covered with the cap member 72, and FIGS. 2 to 11 illustrate a state where the treatment instrument insertion portion 70 is not covered with the cap member 72.

  Hereinafter, with reference to FIGS. 2 to 11, the treatment instrument insertion portion 70 protruding from the grasping operation portion 20 will be described in detail.

  The treatment instrument insertion portion 70 is configured such that a collar member 80, a luer base (base member) 90, and a retainer member 100 are housed inside the cylindrical portion 74.

  The collar member 80 is provided at a proximal end portion (one proximal end portion) of the treatment instrument insertion channel 60 on the grasping operation portion 20 side, and is a tubular shape that is fitted into the tubular portion 74 of the treatment instrument insertion portion 70 with a minimum clearance. It consists of members. The color member 80 is made of, for example, a resin material such as modified PPO.

  The luer base 90 is supported on the collar member 80 coaxially with the treatment instrument insertion channel 60. The luer base 90 is formed of a cylindrical member for screwing and fixing a treatment instrument attachment (not shown) for introducing a puncture needle with a double thread structure. More specifically, a cylindrical protrusion (not shown) of the treatment instrument attachment is inserted into the cylindrical portion 90X of the luer base 90, and a double thread (not shown) of the treatment instrument attachment is a pair of flange parts of the luer base 90 By screwing into 90Y, the luer base 90 and the treatment instrument attachment (not shown) for introducing the puncture needle are screwed and fixed. The luer base 90 is made of a metal material such as stainless steel, for example.

  The retainer member 100 is formed of a cylindrical member for pressing and fixing the collar member 80 and the luer base 90 housed in the cylindrical portion 74 of the treatment instrument insertion portion 70. That is, a male screw portion 102 is formed on the outer peripheral surface of the retainer member 100, and a female screw portion 76 is formed on the inner peripheral surface of the cylindrical portion 74 of the treatment instrument communication portion 70. By screwing the portion 76, the collar member 80 and the luer base 90 housed in the cylindrical portion 74 of the treatment instrument insertion portion 70 can be pressed and fixed (FIGS. 2 and 9).

  The metal luer base 90 and the resin collar member 80 each have a non-circular convex fitting portion 91 and a non-circular concave fitting hole 81 that are fitted to each other.

  The non-circular convex fitting portion 91 includes a circular convex cylindrical surface 92 formed of a part of a cylindrical surface centering on the axis O (FIG. 6) of the luer base 90 and a non-existing portion of the circular convex cylindrical surface 92. There are six detent projections 93 protruding outward in the radial direction of the extended surface of the circular convex cylindrical surface 92 (virtual cylinder including the circular convex cylindrical surface 92). The six detent projections 93 have a semi-cylindrical shape whose axis is parallel to the axis of the luer base 90. In this embodiment, the six anti-rotation projections 93 are grouped in groups of three, are equally spaced within the halved area of the luer base 90, and between the groups is greater than the spacing between the groups. It is formed in rotational symmetry with respect to the axis O of the luer base 90 so that the interval is formed.

  As shown in FIGS. 10 and 11, the six detent projections 93 are formed of six cylindrical pins 94 made of a member different from the luer base 90 (preferably made of the same metal material as the luer base 90). Thus, six column pin support holes 95 into which the six column pins 94 are fitted are formed in the luer base 90. By fitting the six cylindrical pins 94 into the six cylindrical pin support holes 95 and bonding them together, the six detent projections 93 are formed. In this way, by forming the six non-rotating projections 93 using the six cylindrical pins 94 made of different members from the luer base 90, additional processing (post-processing) of the cylindrical pin support holes is made on the conventional luer base. 6), and the six non-rotating convex portions 93 can be easily formed.

  It is preferable that the diameter of the six cylindrical pin support holes 95 is located inside the extended surface of the circular convex cylindrical surface 92 (virtual cylinder including the circular convex cylindrical surface 92). This reliably prevents the six cylindrical pins 94 from falling out of the six cylindrical pin support holes 95 in the radial direction after the six cylindrical pins 94 are fitted into the six cylindrical pin support holes 95 respectively. Can do.

  The non-circular concave fitting hole 81 corresponds to the circular concave cylindrical surface 82 corresponding to the circular convex cylindrical surface 92 and the six non-rotating convex portions 93 (six cylindrical pins 94). There are six detent recesses 83 protruding outward in the radial direction of the extended surface of the circular concave cylindrical surface 82 (virtual cylinder including the circular concave cylindrical surface 82) that engages with the lever. The six anti-rotation recesses 83 have a semi-cylindrical shape whose axis is parallel to the axis of the luer base 90. The six detent recesses 83 are formed to be rotationally symmetric with respect to the axis of the luer base 90.

  When the ultrasonic endoscope 10 configured as described above is used to perform an inspection using the ultrasonic endoscope puncture needle, the ultrasonic endoscope 10 is positioned in the vicinity of the inspection target site in the body of the subject. The treatment tool attachment (not shown) for introducing the puncture needle is screwed and fixed to the luer base 90 with a double thread structure. That is, the treatment instrument attachment is inserted into the cylindrical portion 90X of the luer base 90, and a double thread (not shown) of the treatment instrument attachment is screwed into the pair of flange portions 90Y of the luer base 90, thereby Screw in and fix the treatment tool attachment for introducing the puncture needle. Then, the puncture needle is inserted into the treatment instrument insertion channel 60 from the treatment instrument insertion portion 70 via the treatment instrument attachment, and the distal end opening of the treatment instrument insertion channel 60 (the channel opening provided in the distal end rigid portion 31 of the body insertion portion 30). ) To the outside and puncture the site to be observed in the body of the subject to collect the tissue.

  Attention is now paid to the screwing pressure (torque) applied when the treatment instrument attachment is screwed and fixed to the luer base 90 by the double thread structure. This screwing pressure (torque) is generated around the six rotation prevention projections 93 (six cylindrical pins 94) of the non-circular convex fitting portion 91 of the luer base 90 and the six non-circular concave fitting holes 81 of the collar member 80. Since it is dispersed at the fitting portions (six locations) with the stop recess 83, the collar member 80 supporting the luer base 90 can be destroyed, and the malfunction of the luer base 90 rotating relative to the collar member 80 can be prevented. . This effect can be obtained even more significantly by forming the six anti-rotation convex portions 93 and the six anti-rotation concave portions 83 in a semi-cylindrical shape whose axis is parallel to the axis of the luer base 90. Incidentally, the fitting part of the circular convex cylindrical surface 92 and the circular concave cylindrical hole 82 is loosely fitted with a larger clearance than the fitting part of the anti-rotation convex part 93 (column pin 94) and the anti-rotation concave part 83. For this reason, the screwing pressure (torque) applied to the luer base 90 is not distributed.

(Second Embodiment)
With reference to FIG. 12, an ultrasonic endoscope (endoscope) 10 according to a second embodiment of the present invention will be described. In the second embodiment, the six detent projections 93 are not formed by using the six cylindrical pins 94 made of different members from the luer base 90 as in the first embodiment. A circular convex cylindrical surface 92 and six detent projections 93 are integrally formed. As a result, the luer base 90 can be easily mass-produced at a low cost.

  In the first embodiment and the second embodiment described above, the case where six anti-rotation convex portions 93 are formed on the luer base 90 has been described as an example, but the number of anti-rotation convex portions is not limited thereto. Various design changes are possible. For example, an aspect in which 2 to 5 or 7 or more detent projections are formed on the luer base 90 is also possible.

  In the first embodiment and the second embodiment described above, the case where the six anti-rotation protrusions 93 are formed rotationally symmetrically with respect to the axis of the luer base 90 has been described as an example, but the anti-rotation protrusion is not necessarily rotated. There is no need to arrange them symmetrically, and various design changes are possible.

  In the first embodiment and the second embodiment described above, the case where the six anti-rotation convex portions 93 and the six anti-rotation concave portions 83 are formed in a semi-cylindrical shape whose axis is parallel to the axis of the luer base 90 is illustrated. Although explained, the shape of the rotation prevention convex part and the rotation prevention recessed part is not limited to this. That is, the shape of the non-rotating convex portion and the non-rotating concave portion supports the luer base 90 by dispersing the screwing pressure (torque) repeatedly applied every time the treatment instrument (treatment instrument attachment) is attached to the luer base 90. As long as the failure of the collar member 80 to be performed and the failure of the luer base 90 to rotate relative to the collar member 80 can be prevented, an appropriate design change is possible. For example, the hemispherical projection can be a non-rotating convex portion.

10 Ultrasound endoscope (endoscope)
20 Grasping operation part (operation part)
21 Bending operation lever 22 Suction button 23 Air / water feeding button 30 Internal body insertion portion 31 Tip rigid portion 32 Bending portion 33 Flexible tube portion 40 Universal tube 50 Ultrasound image transmission tube 55 Ultrasound probe 60 Treatment instrument insertion channel 62 Channel branch Part 64 Suction conduit 70 Treatment instrument insertion part 72 Cap member 74 Tubular part 76 Female thread part 80 Resin collar member 81 Non-circular concave fitting hole 82 Circular concave cylindrical surface 83 Non-rotating concave part 90 Metal luer base ( (Base material)
90X Cylindrical part 90Y A pair of flange parts 91 Non-circular convex fitting part 92 Circular convex cylindrical surface 93 Anti-rotation convex part 94 Cylindrical pin 95 Cylindrical pin support hole 100 Retainer member 102 Male thread part

Claims (5)

A treatment instrument insertion channel extending between the operation section and the body insertion section;
A resin collar member provided at a base end portion of the treatment instrument insertion channel on the operation portion side; and a metal cap member supported on the resin collar member coaxially with the treatment instrument insertion channel; Prepared,
In the endoscope, the metal base member and the resin collar member each have a non-circular convex fitting portion and a non-circular concave fitting hole that are fitted to each other.
The non-circular convex fitting portion includes a circular convex cylindrical surface formed of a part of a cylindrical surface centering on an axis of the metal base member, and a circular convex cylinder in a non-existing portion of the circular convex cylindrical surface. A plurality of anti-rotation protrusions protruding outward in the radial direction of the extended surface of the shaped surface; and the non-circular concave fitting holes are circular concaves that engage with each other corresponding to the circular convex cylindrical surface. Having a cylindrical surface and a plurality of anti-rotation recesses projecting radially outward from the extended surface of the circular concave cylindrical surface that engage with each other corresponding to the plurality of anti-rotation projections;
Endoscope characterized by. The endoscope according to claim 1, wherein
The endoscope in which the plurality of anti-rotation projections and the plurality of anti-rotation recesses have a semi-cylindrical shape whose axis is parallel to the axis of the metal base member. The endoscope according to claim 1 or 2,
The endoscope in which the plurality of anti-rotation projections and the plurality of anti-rotation recesses are rotationally symmetric with respect to the axis of the metal base member. The endoscope according to claim 2 or 3,
The plurality of non-rotating convex portions are composed of a plurality of column pins made of a member different from the metal base member, and the plurality of column pins for fitting the plurality of column pins to the metal base member. An endoscope in which a support hole is formed. The endoscope according to claim 4, wherein
The endoscope in which the diameter portion of each of the plurality of cylindrical pin support holes is located inside the extended surface of the circular convex cylindrical surface.

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