JP5544278B2 - Ultrasound endoscope puncture needle device - Google Patents

Description

  The present invention relates to a puncture needle device for an ultrasonic endoscope that is used by being inserted into an internal conduit of the ultrasonic endoscope.

In Patent Document 1, an ultrasonic probe provided at the distal end portion of the insertion portion, a base projecting from the operation portion, and a base formed inside the operation portion and the insertion portion extend toward the ultrasonic probe side, and its distal end Discloses an ultrasonic endoscope including an internal conduit that opens at the surface of the distal end portion of the insertion portion, and a puncture needle device that can be attached to and detached from the base.
This puncture needle device includes a cylindrical connecting portion that is a main body portion, a sheath that protrudes outside through an internal space of the cylindrical connecting portion, a puncture needle that is inserted in the sheath so as to be able to advance and retract, and a cylindrical connecting portion. And a slider that is slidable and supports one end of the puncture needle in a fixed state.
When using the puncture needle device, the distal end portion of the cylindrical connection portion is connected to the base in a fixed state. Then, the sheath (and the puncture needle) is inserted into the internal conduit of the ultrasonic endoscope through the inside of the base, and the distal end portion of the sheath (and the puncture needle) protrudes outside from the distal end opening of the internal conduit.
In this state, when the slider is slid toward the base with respect to the cylindrical connection portion, the distal end portion of the puncture needle protrudes from the distal end opening of the sheath and faces the ultrasonic probe. Since the outer surface of the tip of the puncture needle has minute irregularities for reflecting ultrasonic waves, when ultrasonic waves are transmitted from the ultrasonic probe, the ultrasonic waves are reflected by the minute irregularities and the ultrasonic probe Therefore, an ultrasonic image of the tip of the puncture needle is displayed on the monitor connected to the ultrasonic endoscope. Therefore, the surgeon can perform endoscopy while looking at the monitor while recognizing the position of the tip of the puncture needle.

Japanese Patent No. 3904299

In general, the axis of the ultrasonic endoscope excluding the tip of the inner pipe is parallel to the axis of the insertion part, but the axis of the inner pipe is inclined with respect to the axis of the insertion part. Therefore, the connecting portion between the tip portion of the internal conduit and the portion located immediately after the tip portion is bent. Accordingly, when the distal end portion of the sheath is projected outside from the distal end opening of the internal conduit, the vicinity of the distal end portion of the sheath is bent at the bent shape portion. Therefore, in this state, when the slider is slid toward the base with respect to the cylindrical connecting portion and the distal end portion of the puncture needle protrudes from the distal end opening of the sheath, the vicinity of the distal end portion of the puncture needle is also bent by the inner conduit and the sheath. In order to bend in accordance with the shape portion, a part of the outer peripheral surface of the distal end portion of the puncture needle is pressed against the peripheral edge portion of the distal end opening of the sheath.
However, since the fine irregularities are formed on the entire outer peripheral surface of the tip of the puncture needle, a large frictional resistance is generated between the minute irregularities and the sheath, and the puncture needle operation (slider operation) becomes unsmooth. There is a risk.

  The present invention provides a large friction between the puncture needle and the sheath when the puncture needle and the sheath having a micro unevenness on the outer peripheral surface are inserted through the inner conduit in which the vicinity of the distal end of the ultrasonic endoscope is bent. An object of the present invention is to provide an ultrasonic endoscope puncture needle device that can accurately recognize a puncture needle using ultrasonic waves without generating resistance.

The puncture needle device for an ultrasonic endoscope of the present invention is provided with a cylindrical connecting portion that is attachable to and detachable from a base provided in an ultrasonic endoscope having an ultrasonic probe at a distal end portion, and the cylindrical connecting portion. Further, a rotation restricting means for restricting the rotation of the cylindrical connecting portion around the axis when the cylindrical connecting portion is connected to the base, a part of the cylindrical connecting portion is located in the cylindrical connecting portion, and the tip is connected to the cylindrical connection. And a flexible sheath that enters the internal conduit of the ultrasonic endoscope when the cylindrical connecting portion is connected to the base, and the sheath is inserted into the sheath so as to be able to advance and retract. A cylindrical puncture needle that can be deformed along the shape of the puncture needle, a puncture needle that supports the puncture needle so as not to rotate about its axis, and the tip of the puncture needle protrudes from the tip of the sheath and faces the ultrasonic probe Relative axially between the position and the storage position where the tip is stored in the sheath. In the puncture needle device comprising a slider supported on the cylindrical connecting portion Id possible and said axis about a relative rotation, was formed on the outer peripheral surface of the puncture needle, and irregularity formation region having a fine unevenness, the An unevenness non-formation region formed on the outer peripheral surface that does not have the fine asperity, and the unevenness formation region is a region having a central angle of 180 ° centering on the axis of the puncture needle on the ultrasonic probe side. And the concavo-convex formation region is a region having a central angle of 180 ° centering on the axis of the puncture needle opposite to the ultrasonic probe .

According to the present invention, the sheath inserted into the internal conduit of the ultrasonic endoscope when the cylindrical connecting portion is connected to the base of the ultrasonic endoscope in a state where the rotation is restricted using the rotation restricting means. When the distal end portion of the puncture needle protrudes from the distal end of the puncture needle, the unevenness-unformed region on the outer peripheral surface of the distal end portion faces the ultrasonic probe.
In general, the axis of the ultrasound endoscope excluding the tip of the inner pipe is parallel to the axis of the insertion part, but the axis of the inner pipe is inclined with respect to the axis of the insertion part. And the connection part of the front-end | tip part of this internal pipe line and the part located just behind it is a bending shape. Therefore, when the distal end portion of the sheath is projected outward from the distal end opening of the internal conduit, the vicinity of the distal end of the sheath is bent at the bent shape portion, and in this state, the distal end portion of the puncture needle is projected from the distal end opening of the sheath. In this case, since the tip of the puncture needle bends in accordance with the bent portion of the inner conduit and the sheath, the unevenness formation region on the outer peripheral surface of the puncture needle often comes into pressure contact with the peripheral portion of the distal end opening of the sheath. .
However, since the unevenness-unformed region of the present invention does not have minute unevenness, a large frictional resistance is not generated between the puncture needle and the sheath, and the operator can smoothly operate the slider.
In addition, since the projections and depressions on the outer peripheral surface of the puncture needle are formed with minute protrusions for reflecting ultrasonic waves, the operator can accurately recognize the puncture needle.

It is a side view in the connection state of the ultrasonic endoscope of one Embodiment of this invention, and the puncture needle apparatus of the operation part shortest state. It is a perspective view of the puncture needle device extended from the operation part shortest state. It is a perspective view of a nozzle | cap | die. It is a front view of a nozzle | cap | die. It is a perspective view of a cylindrical connection part. It is a front view of a cylindrical connection part. It is sectional drawing which follows the VII-VII arrow line of FIG. FIG. 8 is a cross-sectional view when the lock member is located at a retaining position along the line VIII-VIII in FIG. 1. It is sectional drawing similar to FIG. 8 when a lock member is located in the insertion / removal permission position. It is sectional drawing when a lock member is located in a retaining position along the XX arrow line of FIG. It is sectional drawing similar to FIG. 10 when a lock member is located in the insertion / removal permission position. It is an enlarged side view which fractures | ruptures and shows a part of front-end | tip part of an ultrasonic endoscope. It is an enlarged view which abbreviate | omits and shows the insertion part of an ultrasonic endoscope when it sees to the XIII arrow line direction of FIG.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. In the following description, in the front-rear direction, the distal end side of the insertion portion 13 is defined as “front” and the operation portion 11 side is defined as “rear” for the ultrasonic endoscope 10, and the puncture needle device 30 is punctured. The distal end side of the needle 51 is “front”, and the stylet support cap 55 side is “rear”. First, the structure of the ultrasonic endoscope 10 to which the puncture needle device 30 can be attached and detached will be described.
The ultrasonic endoscope 10 includes an operation unit 11, an insertion unit 13 that extends forward from the operation unit 11 and includes an ultrasonic probe 12 at the tip, and a light guide that extends from the operation unit 11 to the opposite side of the insertion unit 13. A tube and an ultrasonic image transmission tube (both not shown), and a light guide connector and an ultrasonic image connector are provided at the ends of the light guide tube and the ultrasonic image transmission tube, respectively. The bending portion 14 in the vicinity of the distal end portion of the insertion portion 13 bends in the vertical direction according to the rotation operation of the bending operation lever 15 provided in the operation portion 11. A treatment tool insertion protrusion 16 is provided on the operation portion 11, and a base 17 having a substantially cylindrical shape and open at both ends is provided on the rear end surface of the treatment tool insertion protrusion 16. As shown in FIG. 3 and FIG. 4 etc., a pair of arcs in which both sides of the circle are symmetric with respect to the center point of the circle near the tip of the outer peripheral surface of the base 17 (the lengths of the two arcs are the same) A non-circular flange portion (rotation restricting means) 18 cut along the line is integrally projected. Further, an annular flange 19 having a circular shape in front view is provided on the outer peripheral surface of the base 17 so as to be shifted from the flange portion 18 in the axial direction. The annular flange (flange) 19 (and the surface on the flange 18 side) is orthogonal to the axis of the base 17. Furthermore, inside the operation unit 11 and the insertion unit 13, an internal tube is connected to the treatment tool opening 21 formed at one end connected to the base 17 and the other end positioned at the insertion unit 13 immediately after the ultrasonic probe 12. A path 20 (see FIG. 1) is provided. The portion excluding the front end portion 20a and the rear end portion of the internal conduit 20 extends in parallel with the axis of the insertion portion 13, but the portion near the front end portion 20a of the internal conduit 20 is bent as shown in FIG. The axis of the front end portion 20 a of the internal conduit 20 is inclined with respect to the axis of the insertion portion 13.
The ultrasonic imaging connector is connected to an ultrasonic diagnostic apparatus (not shown), the ultrasonic diagnostic apparatus is connected to a CRT monitor, and the ultrasonic probe 12 is covered with a rubber balloon (not shown). When the ultrasonic switch of the ultrasonic diagnostic apparatus is pressed, an ultrasonic wave is transmitted from the surface of the ultrasonic probe 12 toward the test part, and the ultrasonic probe 12 receives the ultrasonic wave reflected by the test part. An ultrasonic image transmission cable (not shown) for connecting the ultrasonic probe 12 and the ultrasonic image connector is provided inside the insertion unit 13, the operation unit 11, and the ultrasonic image transmission tube. The ultrasonic image received by 12 is electrically processed by the ultrasonic diagnostic apparatus and displayed on the CRT monitor.

Next, the structure of the puncture needle device 30 will be described.
The puncture needle device 30 has a substantially cylindrical tubular connecting portion 31 formed of a hard resin (PC (polycarbonate) or a resin material capable of EOG sterilization such as Noryl). A portion of the cylindrical connection portion 31 excluding the front portion is a slider support hole 32 having a circular cross section, and a female screw hole 33 communicating the slider support hole 32 and the external space is formed at the rear portion of the cylindrical connection portion 31. It is formed as a through hole. The front end portion of the slider support hole 32 communicates with an intermediate circular hole 34 having a smaller diameter and concentric with the slider support hole 32, and the front end portion of the cylindrical connection portion 31 has the same cross-sectional shape as the annular flange 19 of the base 17. A certain fall prevention recess 35 is provided. Between the intermediate circular hole 34 and the fall-preventing recess 35, the front shape is the same as that of the flange portion 18 of the base 17, and the non-circular hole (rotation) is smaller than the intermediate circular hole 34 and the fall-preventing recess 35. The restricting means 36 is formed so as to be concentric with the intermediate circular hole 34 and the fall-preventing recess 35. A bottom surface (rear surface) of the depression preventing recess 35 is an insertion restriction surface (insertion restriction portion) 37 that is a plane orthogonal to the axis of the cylindrical connection portion 31. A pair of through support holes 38 </ b> A and 38 </ b> B that are parallel to each other and pass through the cylindrical connection portion 31 in a direction orthogonal to the axis of the cylindrical connection portion 31 are formed in the front portion of the cylindrical connection portion 31.

  A first slider 40, which is a cylindrical member made of a hard resin (PC or the like), is slidable and relative to the slider support hole 32 of the cylindrical connection portion 31 from its rear end opening. Inserted as non-rotatable. The first slider 40 is open at both front and rear ends, and its outer diameter is substantially the same as the diameter of the slider support hole 32. A first stopper member 41 made of hard resin, which is a cylindrical member having a diameter larger than that of the slider support hole 32, is fixed to the rear end portion of the first slider 40. Accordingly, the first slider 40 has a maximum push-out position (protrusion position) where the first stopper member 41 abuts the rear end surface of the cylindrical connection portion 31 and a maximum pull-out in which further rearward movement is restricted by a stopper (not shown). The front end surface (inner end surface) of the bolt of the first fixing screw member 43 that is slidable with respect to the cylindrical connecting portion 31 between the position (storage position) and inserted (screwed) into the slider support hole 32. The position of the first slider 40 relative to the cylindrical connection portion 31 can be fixed by being pressed against the outer peripheral surface of the first slider 40. On the inner surface of the first stopper member 41, a rear end portion of a sheath 44 made of a flexible material such as resin and having both ends opened is fixed concentrically with the first slider 40. The front portion of the sheath 44 protrudes forward of the cylindrical connection portion 31 through the slider support hole 32, the intermediate circular hole 34, the non-circular hole 36, and the fall prevention concave portion 35. Therefore, the protrusion amount of the sheath 44 with respect to the cylindrical connection portion 31 can be adjusted by changing the slide position of the first slider 40 and the first stopper member 41 with respect to the cylindrical connection portion 31.

A second slider 45, which is a cylindrical member made of a hard resin (PC or the like) having a diameter smaller than the inner diameter of the first slider 40, is slidably inserted into the internal space of the first slider 40. The front and rear ends of the second slider 45 are open, and a rear end fixing member 46 made of hard resin (PC (polycarbonate), Noryl, etc.) is fixed to the rear end of the second slider 45. The rear end fixing member 46 is a cylindrical member whose rear portion is smaller in diameter than the front portion, and a male screw is formed on the outer peripheral surface of the rear portion of the rear end fixing member 46. Further, a second stopper member 48 made of hard resin (PC or the like) that can slide with respect to the second slider 45 is slidably mounted on the outer peripheral surface of the second slider 45. The second stopper member 48 is formed with a female screw hole (not shown) penetrating the second stopper member 48 in the radial direction. The second fixed screw member similar to the first fixed screw member 43 is formed in the female screw hole. 49 is inserted (screwed). Therefore, the sliding position of the second stopper member 48 with respect to the second slider 45 can be fixed by pressing the front end surface (inner end surface) of the bolt of the second fixing screw member 49 against the outer peripheral surface of the second slider 45. The second slider 45 and the rear end fixing member 46 are configured so that the second stopper member 48 comes into contact with the rear end surface of the first stopper member 41, and the first slider 40 and the second slider 45 of the second slider 45 by the stopper (not shown). The first slider 40 and the first stopper member 41 are slidable between the maximum pull-out position where further rearward movement with respect to the one stopper member 41 is restricted. Further, the pushing position can be adjusted by adjusting the sliding position of the second stopper member 48 with respect to the second slider 45. A rear end portion of a cylindrical puncture needle 51 made of a hollow metal material having flexibility and having an open rear end is fixed concentrically on the inner surface of the rear end fixing member 46. An opening 52 is formed at the front end. Further, as shown in FIGS. 12 and 13, fine irregularities for reflecting ultrasonic waves emitted from the ultrasonic probe 12 are formed on the outer peripheral surface of the front end portion of the puncture needle 51 by using sandblast or the like. is there. The minute irregularities are not formed on the entire outer peripheral surface of the front end portion, but when the puncture needle 51 is viewed from the front (opening 52 side) along the axis of the puncture needle 51, the first fixing screw member 43 side. Is formed only in the concavo-convex formation region 53, which is a semicircular region (region having a central angle of 180 ° centered on the axis), and the remaining region of the outer peripheral surface in the vicinity of the front end is formed with fine undulations. It is the uneven | corrugated non-formation area | region 54 which is not made. Since the puncture needle 51 is slidably inserted into the sheath 44, the front end portion of the puncture needle 51 is moved by changing the slide position of the second slider 45 (rear end fixing member 46) relative to the first slider 40. It can be made to appear and disappear from the front end opening of the sheath 44.
Further, a female screw formed on the inner peripheral surface of a stylet support cap 55 which is a cylindrical member made of hard resin (for example, POM) is detachably screwed onto the male screw at the rear portion of the rear end fixing member 46. is there. The stylet support cap 55 has a rear end of a stylet 56, which is a flexible member, fixed thereto. The stylet 56 is inserted from the rear end opening of the puncture needle 51 into the inner space of the puncture needle 51 so as to be relatively movable. It is.

A hard resin locking member 60 is provided in the through-supporting hole 38A and the through-supporting hole 38B of the cylindrical connecting portion 31.
The lock member 60 is a rod-like member inserted into the through support hole 38A and the through support hole 38B, and connects a pair of slide members 61 made of a metal material such as brass or SUS and one end of each slide member 61 to each other. A knob 66 made of hard resin (for example, PC) and a knob 68 made of hard resin (for example, PC) for connecting the other ends of the slide member 61 to each other.
As shown in FIGS. 8 and 9, the pair of slide members 61 includes a stopper portion 62 having the same cross-sectional shape as the through-supporting holes 38A and 38B, and a passage allowing portion having a smaller (thin) cross-sectional shape than the through-supporting holes 38A and 38B. 63, an engaging projection 64 having a width narrower than that of the stopper 62 is provided at the tip of the stopper 62, and the tip of the passage allowance 63 is narrower than the passage allowance 63. An engaging protrusion 65 having a width is provided to protrude. The knob 66 has a pair of attachment holes 67 into which the engaging protrusion 64 can be detachably fitted, and the knob 68 has a pair of attachments to which the engagement protrusion 65 can be detachably fitted. A hole 69 is formed.
In order to attach the lock member 60 to the cylindrical connection portion 31, the pair of passage allowance portions 63 and the engagement protrusions 65 are fitted in a state where the pair of engagement protrusions 64 are respectively fitted in the attachment holes 67 of the knob 66. Are inserted into the through support hole 38A and the through support hole 38B, respectively. And after making each engagement protrusion 65 protrude the outer side of penetration support hole 38A, 38B, the attachment hole 69 of the knob | pick part 68 is fitted to each engagement protrusion 65. As shown in FIG. Thus, since the lock member 60 has a simple structure including the slide member 61, the knob 66, and the knob 68, the number of parts is small and the assembling work is easy. It can also be easily separated by the reverse procedure of assembly.

Next, a procedure for attaching and detaching the puncture needle device 30 to the base 17 and a procedure for using the puncture needle device 30 will be described.
In order to connect the puncture needle device 30 separated from the ultrasonic endoscope 10 to the base 17 of the ultrasonic endoscope 10, first, the knob portion 68 is pressed against the cylindrical connection portion 31 toward the knob portion 66. By doing so, the lock member 60 is moved to the insertion / removal allowable position shown in FIGS. Next, the cylindrical connection part 31 is positioned coaxially with the base 17 and the direction of the non-circular hole 36 of the cylindrical connection part 31 is the same as that of the flange part 18 of the base 17, and then the cylindrical connection part 31 falls down. The prevention recess 35 is brought close to the base 17, and the collapse prevention recess 35 is put on the flange 18 of the base 17. As shown in FIG. 9, the distance between the pair of passage allowing portions 63 is longer than the dimensions of the non-circular hole 36 and the flange portion 18 in the same direction. Accordingly, if the cylindrical connecting portion 31 is further moved closer to the base 17 side and the base 17 is inserted to a predetermined position in the cylindrical connecting portion 31, the collar portion 18 passes through the pair of passage allowing portions 63 and is connected to the cylindrical connection. It fits into the non-circular hole 36 of the portion 31 and the peripheral surface of the annular flange 19 comes into surface contact with the annular surface which is the inner peripheral surface of the depression preventing recess 35 and the surface on the flange 18 side of the annular flange 19 is inserted. Surface contact with the regulation surface 37 (see FIGS. 9 and 11). In this state, when the knob 66 is pressed toward the knob 68 with respect to the cylindrical connecting portion 31 and moved to the retaining position shown in FIG. 8, the pair of stoppers 62 are located on the annular flange 19 side of the flange 18. Contact the surface (see FIGS. 8 and 10).
In such a state, the escape direction (movement toward the stylet support cap 55 side) of the cylindrical connection portion 31 with respect to the base 17 is regulated by the contact between the pair of stopper portions 62 and the base 17, and the cylindrical connection portion 31. Is inserted into the base 17 (the movement of the sheath 44 and the puncture needle 51 toward the distal end side) is regulated by the contact of the annular flange 19 and the insertion regulating surface 37, so that the axial direction of the cylindrical connecting portion 31 with respect to the base 17 Movement to is completely prevented. Further, since the flange 18 and the non-circular hole 36 having the same shape and the non-circular shape are fitted to each other, the rotation of the cylindrical connecting portion 31 around the base 17 with respect to the base 17 is completely prevented. In addition, the annular flange 19 and the insertion restricting surface 37 formed on the base 17 so as to be offset from the collar portion 18 are in surface contact with each other, and the peripheral surface of the annular flange 19 faces the inner peripheral surface of the depression preventing recess 35. Since it contacts, the fall of the cylindrical connection part 31 with respect to the base 17 is completely prevented.

When the puncture needle device 30 is fixed to the base 17 (ultrasound endoscope 10) in this manner, the front end of the sheath 44 passes through the inside of the internal conduit 20 as shown in FIGS. Since it protrudes to the outside of the opening for treatment 21, the vicinity of the front end of the sheath 44 is bent at the bent portion near the front end of the internal conduit 20, and the front end of the sheath 44 is opened substantially parallel to the front end 20a. 21 protrudes from the outside. In this state, when the first slider 40 is slid toward the maximum push-in position with respect to the cylindrical connecting portion 31, the puncture needle 51 slides forward with respect to the sheath 44. Therefore, as shown in FIG. The front end portion projects outward from the front end opening of the sheath 44. Since the puncture needle 51 can be deformed according to the shape of the sheath 44, the puncture needle 51 bends according to the shape of the bent portion when passing through the bent portion of the sheath 44. Therefore, the front end portion of the puncture needle 51 is substantially parallel to the front end portion of the sheath 44, and the unevenness forming region 54 at the front end portion of the puncture needle 51 is a portion on the ultrasonic probe 12 side of the front end opening of the sheath 44 (FIG. 12, FIG. 13 (the portion indicated by point A). However, since the minute unevenness is not formed in the unevenness forming region 54, a large frictional resistance is not generated between the puncture needle 51 and the sheath 44, and the operator can perform the first slider 40 (and the puncture needle 51). Can be operated smoothly.
On the other hand, since the ultrasonic wave emitted from the ultrasonic probe 12 is reflected by the concave / convex formation region 53 of the puncture needle 51 and received by the ultrasonic probe 12, an ultrasonic image of the front end portion of the puncture needle 51 is displayed on the CRT monitor. Is clearly displayed. In addition, since the concavo-convex formation region 53 is formed in a semicircular region on the outer peripheral surface of the puncture needle 51 (region having a central angle of 180 ° opposite to the ultrasonic probe 12 centering on the axis of the puncture needle 51), the CRT The shape of the entire width of the front end portion of the puncture needle 51 is displayed on the monitor. In this way, the operator can accurately recognize the position and shape of the front end portion of the puncture needle 51 by looking at the CRT monitor, so that endoscopy can be performed accurately.

  When the treatment with the puncture needle device 30 is completed, or when it is desired to insert a treatment tool different from the puncture needle device 30 into the base 17, the knob portion 68 is first pressed toward the knob portion 66 side with respect to the cylindrical connection portion 31. By doing so, the lock member 60 is moved to the insertion / removal allowable position shown in FIGS. Then, as described above, the pair of stopper portions 62 moves laterally from the surface of the flange portion 18 on the annular flange 19 side, and the flange portion 18 of the base 17 can pass between the pair of passage permission portions 63. Accordingly, when the cylindrical connecting portion 31 is moved along the axis toward the stylet support cap 55 side, the flange portion 18 of the base 17 escapes from the non-circular hole 36. Removal work is completed.

As mentioned above, although this invention was demonstrated based on the said embodiment, this invention can be implemented, giving various changes.
For example, the configuration (rotation restricting means) for fixing the puncture needle device 30 with respect to the base 17 in a state where the rotation is restricted may not be the one in the above embodiment, and for example, the tip of the cylindrical connecting portion 31 and the base 17 may be threaded grooves formed on each other.
Further, the fine unevenness of the unevenness forming region 53 may be formed by a manufacturing method other than sandblasting.

DESCRIPTION OF SYMBOLS 10 Ultrasound endoscope 11 Operation part 12 Ultrasound probe 13 Insertion part 14 Bending part 15 Bending operation lever 16 Protrusion part 17 for insertion of treatment tools Cap 18 Butt part (rotation restricting means)
19 Annular flange (flange)
20 Internal pipe line 20a Front end 21 Treatment tool opening 30 Puncture needle device 31 Cylindrical connecting portion 32 Slider support hole 33 Female screw hole 34 Intermediate circular hole 35 Fall prevention recess 36 Non-circular hole (rotation restricting means)
37 Insertion restriction surface (insertion restriction part)
38A 38B Through support hole 40 First slider 41 First stopper member 43 First fixing screw member 44 Sheath 45 Second slider 46 Rear end fixing member 48 Second stopper member 49 Second fixing screw member 51 Puncture needle 52 Opening 53 Concavity and convexity formation Area 54 Concavity and convexity non-formation area 55 Stylet support cap 56 Stylet 60 Lock member 61 Slide member 62 Stopper part 63 Passing allowance part 64 65 Engagement protrusion part 66 68 Knob part 67 69 Mounting hole

Claims (1)

A cylindrical connecting part detachable with respect to a base provided in an ultrasonic endoscope provided with an ultrasonic probe at a tip part;
A rotation restricting means for restricting the rotation of the cylindrical connecting portion around the axis when the cylindrical connecting portion is connected to the base;
Flexibility in which a part is located in the cylindrical connecting portion, the tip protrudes from the cylindrical connecting portion, and enters the internal conduit of the ultrasonic endoscope when the cylindrical connecting portion is connected to the base. A sheath having
A cylindrical puncture needle that is deformably inserted along the shape of the sheath, inserted in the sheath so as to be able to advance and retract;
The puncture needle is supported so as not to rotate around its axis, and the tip of the puncture needle protrudes from the tip of the sheath, and faces between the protruding position and the storage position where the tip is stored in the sheath. A slider that is supported by the cylindrical connecting portion so as to be relatively slidable in the axial direction and not rotatable relative to the axial line;
In a puncture needle device comprising:
An unevenness forming region having minute unevenness formed on the outer peripheral surface of the puncture needle,
An irregularity non-formation region that does not have the minute irregularities formed on the outer peripheral surface ;
Provided,
The unevenness non-formation region is a region having a central angle of 180 ° centering on the axis of the puncture needle on the ultrasonic probe side,
The puncture needle device for an ultrasonic endoscope , wherein the concavo-convex formation region is a region having a central angle of 180 ° around the axis of the puncture needle opposite to the ultrasonic probe .

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