JP5271798B2 - 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.

Patent Document 1 discloses an ultrasonic endoscope having a base protruding from an operation 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, and a puncture needle that is inserted into the sheath so as to be able to advance and retract. .
When using the puncture needle device, attach one end of a cylindrical forceps plug made of an elastic material such as rubber to the base using the elastic force, and connect the cylindrical connection of the puncture needle device to the other end of the forceps plug One end of each part is connected using the elastic force of the forceps plug. Then, the sheath (and the puncture needle) passes through the inside of the base and is inserted into the inner conduit of the ultrasonic endoscope, and the distal end portion of the sheath (and the puncture needle) is near the distal end of the insertion portion of the ultrasonic endoscope. Protruding outside.

JP 2005-137814 A

In order for the surgeon to accurately operate the puncture needle device connected to the ultrasonic endoscope, it is necessary to make the cylindrical connection portion immovable with respect to the base.
However, since the forceps plug of Patent Document 1 is made of an elastic material, when the puncture needle device is connected to the base of the ultrasonic endoscope via the forceps plug, the puncture needle device is connected to the base (ultrasonic endoscope). I'm wobbling.
Furthermore, the rotation of the puncture needle device around the axis with respect to the base is intended to be regulated using the puncture needle device and the frictional resistance between the base and the forceps plug. However, when a large rotational force is applied to the puncture needle device, the frictional force alone cannot resist this rotational force, and the puncture needle device rotates around the axis.

  An object of the present invention is to provide a puncture needle device for an ultrasonic endoscope that has a simple structure and can be connected to a base of an ultrasonic endoscope in a stationary state.

  A puncture needle device for an ultrasonic endoscope according to the present invention includes a cylindrical connecting portion that can insert a base including a non-circular collar projecting from an ultrasonic endoscope main body to a predetermined position in an internal space; A flexible sheath that is inserted into the internal conduit of the ultrasonic endoscope when the base is inserted into the internal space, and a puncture needle that is inserted in the sheath so as to be able to advance and retreat In a puncture needle device for an ultrasonic endoscope comprising: a connection end portion of the cylindrical connection portion with the base, which is formed so as to be aligned on a specific circumference, from a closed state aligned on the circumference A plurality of elastic opening / closing pieces that can be elastically deformed in an open state that moves from the closed state to the outer peripheral side, and the elastic opening / closing pieces that are formed in the elastic opening / closing piece allow the base to slide relative to the cylindrical connection portion when in the closed state And in the closed state with the base inserted to the predetermined position. When the base is inserted to the predetermined position, the flange portion is fitted and the closed portion is formed on the inner peripheral surface of each elastic opening and closing piece. A rotation-preventing groove that contacts the peripheral surface of the flange when in the state, an unlocking position that is supported on the outer peripheral surface of the elastic opening / closing piece, and that allows the elastic opening / closing piece to be deformed to the open state; And an annular lock member that can rotate and move to a lock position that holds the open / close piece in the closed state.

  When the elastic opening and closing piece is in the closed state with the base inserted into the predetermined position, the slide restricting portion comes into contact with the collar and moves toward the ultrasonic endoscope body side of the collar. The ultrasonic endoscope main body from the retaining portion that regulates the sliding of the body, and the flange that protrudes from the base when the elastic opening and closing piece is positioned in the closed state with the base inserted to the predetermined position An insertion restricting portion that contacts a flange located on the side and restricts further insertion of the base.

  Further, the slide restricting portion may be an inner surface of the detent groove that contacts both the front and back surfaces of the flange when the elastic opening and closing piece is in the closed state with the base inserted to the predetermined position. .

  An engagement protrusion is formed on one of the outer peripheral surface of the elastic opening and closing piece and the inner peripheral surface of the annular lock member, and the other is engaged with the engagement protrusion when the annular lock member moves to the lock position. It is preferable to form an engaging recess.

  When the annular lock member is located at the unlocked position on a part of the inner circumferential surface of the annular lock member, a gap is formed between the elastic lock piece and the elastic open / close piece. An inner side that allows deformation to the open state and restricts deformation of the elastic opening / closing piece to the open state by contacting the outer peripheral surface of the elastic opening / closing piece when the annular lock member is located at the lock position. Preferably a flange is formed.

According to the present invention, when the annular lock member is positioned at the unlocked position and the base is inserted to a predetermined position in the cylindrical connection portion while elastically deforming each elastic open / close piece to the open state, each elastic open / close piece is Since the elastic return to the closed state occurs, the elastic opening / closing pieces are held in the closed state when the annular lock member is rotated to the locked position. Then, the slide of the base is restricted by the slide restricting portion, and the relative rotation of the base is also restricted by the rotation preventing groove.
Since the puncture needle device can be fixed with respect to the base while having such a simple structure, the operator can accurately operate the puncture needle device connected to the ultrasonic endoscope.

  According to the second aspect of the present invention, the relative sliding of the base with respect to the cylindrical connecting portion can be restricted using the retaining portion and the insertion restricting portion, and the retaining portion and the insertion restricting portion are separated in the longitudinal direction of the tubular connecting portion. Therefore, the fall of the cylindrical connecting portion with respect to the base can be reliably regulated.

  If comprised like Claim 3, a relative slide with respect to the cylindrical connection part of a nozzle | cap | die can be controlled, without forming a flange in a nozzle | cap | die like Claim 2.

  According to the fourth aspect of the present invention, the annular lock member can be reliably held in the locked position, so that the connection state between the base and the cylindrical connection portion can be more reliably held.

  According to the fifth aspect of the present invention, it is possible to realize the holding of each elastic opening / closing piece in the closed state and the allowance of the elastic deformation to the open state without making the annular lock member complicated.

It is a side view in the connection state of the ultrasonic endoscope of one Embodiment of this invention, and the puncture needle apparatus in an 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 side view of a cylindrical connection part. It is the perspective view seen from the front of the cylindrical connection part in which each elastic opening-and-closing piece is an open state. It is the perspective view which looked at the cylindrical connection part cut | disconnected along the central axis from back. It is a front view of the cylindrical connection part in which each elastic opening / closing piece is in an open state. It is a rear view of a cylindrical connection part. It is sectional drawing when a cyclic | annular locking member is located in an unlocking position along the XX arrow line of FIG. It is sectional drawing which follows the XI-XI arrow line of FIG. It is sectional drawing similar to FIG. 11 when an annular lock member is located in a locked position. It is sectional drawing similar to FIG. 10 of a modification.

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 71 is “front”, and the stylet support cap 75 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 FIGS. 3 and 4 and the like, in the vicinity of the distal end portion of the outer peripheral surface of the base 17, a pair of circular arcs (two A non-circular shaped flange portion 18 cut out along the same arc length) projects integrally. Further, an annular flange 19 having a circular shape in front view and having a larger diameter than the longitudinal dimension (diameter) of the flange portion 18 is provided on the outer peripheral surface of the base 17 so as to be displaced 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. Of the configuration described above, the part excluding the cap 17 is the “ultrasonic endoscope main body” in the claims.
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). As shown in FIG. 7, a portion of the cylindrical connection portion 31 excluding the front portion is a slider support hole 32 having a circular cross section, and the slider connection hole 32 and the external space are provided at the rear portion of the cylindrical connection portion 31. A female screw hole 33 that communicates is formed as a through hole. An intermediate circular hole 34 having a smaller diameter and concentricity than the slider support hole 32, which is located in front of the slider support hole 32, is formed in the internal space of the cylindrical connection portion 31.
As shown in the figure, the front end portion of the cylindrical connecting portion 31 has a smaller diameter than the rear portion thereof, and the portion is connected to the slits 35 at intervals of 90 ° in the circumferential direction and to the base end portion of each slit 35. An auxiliary hole 36 is formed. In the portion of the cylindrical connecting portion 31, four elastic opening / closing pieces 37 and 38 that are separated from each other by the slits 35 and the deformation assisting holes 36 are circumferentially centered on the central axis of the cylindrical connecting portion 31. It is formed side by side. Each of the elastic opening / closing pieces 37 and 38 has an arc shape in cross section, and the arrangement interval between the pair of elastic opening / closing pieces 37 and the pair of elastic opening / closing pieces 38 is 180 °. Each elastic opening and closing piece 37, 38 is in a closed state shown in FIGS. 5, 7, and 9 to 12 in a free state, and is in an open state (see FIGS. 6 and 8) by elastically deforming to the outer peripheral side.
The front end portion of each elastic opening and closing piece 37, 38 is an arc-shaped slide restricting portion 39 that protrudes to the inner peripheral side compared to the rear portion, and the front portion of the inner peripheral surface of the slide restricting portion 39 is an inclined surface 39a. It has become. When the elastic opening and closing pieces 37 and 38 are in the closed state, the inner diameter of the substantially circular hole formed by the inner peripheral surface of each slide restricting portion 39 is based on the longitudinal dimension (diameter) of the flange portion 18 of the base 17. short. An anti-rotation groove 40 located immediately after the slide restricting portion 39 is recessed in the inner peripheral surface of each elastic opening and closing piece 37, 38. When the elastic opening / closing pieces 37 and 38 are in the closed state, the front shape of the groove formed by the rotation-preventing grooves 40 of the elastic opening / closing pieces 37 and 38 is substantially the same as that of the flange 18 as a whole. Further, the front end face of each elastic opening and closing piece 37, 38 constitutes an insertion restricting portion 41, and the bottom face (front surface) of each detent groove 40 constitutes a retaining portion 42.
A locking groove 43 extending in the circumferential direction is recessed in one circumferential end of the outer peripheral surface of the pair of elastic opening and closing pieces 37, and the bottom surface of the locking groove 43 (the cylindrical connection portion 31 in front view). A hemispherical engagement protrusion 44 is provided on the inner peripheral surface of the cylindrical surface centering on the central axis. On the other hand, a locking groove 46 having the same depth as that of the locking groove 43 (the inner peripheral surface has the same curvature as that of the locking groove 43) is located at the same longitudinal position as the locking groove 43 on the outer peripheral surface of the pair of elastic opening and closing pieces 38. A cylindrical surface) and a non-contact groove 47 deeper than the locking groove 46 are formed as grooves extending in the circumferential direction.

An annular lock member 50 made of a hard resin (resin material capable of EOG sterilization such as PC (polycarbonate) or Noryl) is mounted on the outer peripheral side of each elastic opening and closing piece 37, 38. As shown in the drawing, the annular lock member 50 has a cylindrical shape, and the rear end portion of the inner peripheral surface thereof serves as a rotation contact portion 51 that rotatably contacts the rear end portions of the outer peripheral surfaces of the elastic opening / closing pieces 37 and 38. Yes.
Furthermore, the locking groove 43, the locking groove 46, and the non-contact groove 47 on the inner peripheral surface of the annular locking member 50 are positioned in the same longitudinal direction as the locking groove 43, the locking groove 46, and the non-contact groove 47. A pair of inward flanges 52 that fit in a rotatable manner protrude in the circumferential direction at intervals of 180 °. The inner peripheral surfaces of the pair of inner flanges 52 are cylindrical surfaces having the same curvature as the bottom surfaces (inner peripheral surfaces) of the locking groove 43 and the locking groove 46, and the bottom surface has the same shape as the engaging protrusion 44. A joint recess 53 is provided.
In the annular lock member 50, the inner flange 52 is positioned inside the non-contact groove 47 of the elastic opening / closing piece 38, and a gap is formed between the inner peripheral surface of the inner flange 52 and the bottom surface (inner peripheral surface) of the non-contact groove 47. 11 and the inner flange 52 are positioned inside the locking groove 46 and the locking groove 43, and the inner peripheral surface of the inner flange 52 is the locking groove 43 and the locking groove. It rotates with respect to the cylindrical connection part 31 between the lock position (position of FIG. 12) which contacts the bottom face (inner peripheral surface) of the groove | channel 46, and the engagement recessed part 53 fits with the engagement protrusion 44. Is possible. When the annular lock member 50 is located at the unlock position, one end surface in the circumferential direction of the pair of inner flanges 52 contacts the side surface of the elastic opening / closing piece 37 as shown in FIG. Cannot be rotated from the unlocked position in the opposite direction to the locked position, and when the annular lock member 50 is located at the locked position, the other end face in the circumferential direction of the pair of inner flanges 52 is not shown in FIG. Since it contacts the circumferential end surface of the locking groove 43 (inner flange 52), the annular lock member 50 cannot rotate in the opposite direction from the unlock position to the unlock position.

  A first slider 60 that is a cylindrical member made of hard resin (PC or the like) is slidably inserted into the slider support hole 32 of the cylindrical connection portion 31 from the rear end opening of the cylindrical connection portion 31. The front and rear ends of the first slider 60 are open, and the outer diameter thereof is substantially the same as the diameter of the slider support hole 32 and is larger than the intermediate circular hole 34. A hard resin first stopper member 61, 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 60. Therefore, the first slider 60 is between the maximum pushing position where the first stopper member 61 abuts the rear end surface of the cylindrical connecting portion 31 and the maximum drawing position where further backward movement is restricted by a stopper (not shown). Can be slid with respect to the cylindrical connection portion 31, and the front end surface (inner end surface) of the bolt of the first fixing screw member 63 inserted (screwed) into the female screw hole 33 is pressed against the outer peripheral surface of the first slider 60. By doing so, the position of the first slider 60 relative to the cylindrical connecting portion 31 can be fixed. On the inner surface of the first stopper member 61, a rear end portion of a sheath 64 made of a flexible material such as resin and having both ends opened is fixed concentrically with the first slider 60. The front part of the sheath 64 protrudes forward of the cylindrical connection part 31 through the slider support hole 32, the intermediate circular hole 34, and the inner peripheral surfaces of the elastic opening / closing pieces 37 and 38. Therefore, the protrusion amount of the sheath 64 with respect to the cylindrical connection portion 31 can be adjusted by changing the slide position of the first slider 60 and the first stopper member 61 with respect to the cylindrical connection portion 31.

A second slider 65 that 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 60 is slidably inserted into the internal space of the first slider 60. The front and rear ends of the second slider 65 are open, and a rear end fixing member 66 made of hard resin (PC (polycarbonate), Noryl, etc.) is fixed to the rear end of the second slider 65. The rear end fixing member 66 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 66. Further, a second stopper member 68 made of hard resin (PC or the like) that can slide with respect to the second slider 65 is slidably mounted on the outer peripheral surface of the second slider 65. The second stopper member 68 has a female screw hole (not shown) penetrating the second stopper member 68 in the radial direction. The second fixed screw member similar to the first fixing screw member 63 is formed in the female screw hole. 69 is inserted (screwed). Accordingly, the sliding position of the second stopper member 68 with respect to the second slider 65 can be fixed by pressing the front end surface (inner end surface) of the bolt of the second fixing screw member 69 against the outer peripheral surface of the second slider 65. The second slider 65 and the rear end fixing member 66 are configured so that the second stopper member 68 is in contact with the rear end surface of the first stopper member 61 and a stopper (not shown), and the first slider 60 and the second end fixing member 66 of the second slider 65 are omitted. The first slider 60 and the first stopper member 61 can slide with respect to the maximum pull-out position where further rearward movement with respect to the one stopper member 61 is restricted. Furthermore, the pushing position can be adjusted by adjusting the sliding position of the second stopper member 68 with respect to the second slider 65.
On the inner surface of the rear end fixing member 66, a rear end portion of a puncture needle 71 made of a flexible metal material and having an open rear end is fixed concentrically. The front portion of the puncture needle 71 protrudes forward of the sheath 64 through the inside of the sheath 64, and an opening 72 is formed in the vicinity of the front end portion. Therefore, by changing the slide position of the second slider 65 (rear end fixing member 66) relative to the first slider 60, the amount of protrusion of the front end portion of the puncture needle 71 with respect to the sheath 64 changes.
Furthermore, a female screw made of hard resin (for example, an inner peripheral surface of a stylet support cap 75 which is a cylindrical member such as POM is detachably screwed to the male screw at the rear portion of the rear end fixing member 66. The rear end of the stylet 76, which is a flexible member, is fixed to the stylet support cap 75, and the stylet 76 is inserted from the rear end opening of the puncture needle 71 so as to be movable relative to the inner space of the puncture needle 71. It is.

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 annular lock member 50 of the puncture needle device 30 is rotated to the unlock position. .
Next, the cylindrical connecting portion 31 is positioned coaxially with the base 17 and the direction of the entire groove formed by the four detent grooves 40 of the cylindrical connecting portion 31 is the same as that of the flange portion 18 of the base 17 Then, the elastic opening and closing pieces 37 and 38 are brought close to the base 17, and the flange portion 18 is inserted into the hole formed by the inner peripheral surface of each elastic opening and closing piece 37 and 38. Then, the flange portion 18 whose longitudinal dimension is longer than the diameter of the hole formed by the inner peripheral surfaces of the elastic opening and closing pieces 37 and 38 comes into contact with the inclined surfaces 39a of the elastic opening and closing pieces 37 and 38, and each inclined surface 39a is connected to the outer peripheral side. Press on. As a result, the elastic opening / closing pieces 37 and 38 that are spaced inward from the inner peripheral surface of the annular lock member 50 (and the inner peripheral surface of the inner flange 52) are elastically deformed to the outer peripheral side to be in an open state. (Refer to FIGS. 6 and 8), the flange portion 18 passes through the holes formed by the inner peripheral surfaces of the elastic opening and closing pieces 37 and 38, and is fitted into each rotation prevention groove 40 (the position of the base 17 at this time is patented) “Predetermined position” in the claims). Then, the pressing force from the flange portion 18 to each inclined surface 39a disappears, so that each elastic opening and closing piece 37, 38 is elastically restored to the closed state, and the retaining portion 42 of the detent groove 40 as shown in FIGS. Comes into contact with one surface of the flange portion 18, and the insertion restricting portion 41 of the elastic opening / closing pieces 37 and 38 comes into contact with one surface of the annular flange 19.
Thereafter, when the annular lock member 50 is rotated to the locked position, the inner peripheral surfaces of the pair of inner flanges 52 are connected to the bottom surfaces (inner peripheral surfaces) of the locking grooves 43 of the elastic opening / closing pieces 37 and the respective members as shown in FIG. Since it contacts the bottom surface (inner peripheral surface) of the locking groove 46 of the elastic opening / closing piece 38, the deformation of the elastic opening / closing pieces 37, 38 to the open state is restricted (held in the closed state). Further, since the pair of engaging protrusions 44 engage with the corresponding engaging recesses 53, the annular lock member 50 does not rotate to the unlock position side unless the annular lock member 50 is intentionally rotated.

  In such a state, the escape direction (movement toward the stylet support cap 75 side) of the cylindrical connection portion 31 with respect to the base 17 is regulated by the retaining portion 42 and the flange portion 18 of the rotation prevention groove 40, and the cylindrical connection portion. Since the insertion direction of 31 to the base 17 (the movement of the sheath 64 and the puncture needle 71 toward the distal end side) is regulated by the insertion regulating part 41 and the annular flange 19 of the elastic opening and closing pieces 37, 38, Movement in the axial direction relative to the base 17 is completely prevented. Further, the flange portion 18 having substantially the same shape and a non-circular shape are fitted to each other and the groove formed by each rotation prevention groove 40 is fitted to each other, and the inner peripheral surface of each rotation prevention groove 40 is the outer peripheral surface of the flange portion 18. Because of the surface contact, the rotation of the cylindrical connecting portion 31 around the axis 17 with respect to the base 17 is completely prevented. In addition, since the flange portion 18 and the annular flange 19 that are different from each other in the longitudinal direction of the base 17 come into contact with the retaining portion 42 and the insertion restricting portion 41, the cylindrical connection portion 31 is completely prevented from falling over the base 17. The

Thus, since the puncture needle device 30 is completely immobile with respect to the base 17 (ultrasound endoscope 10), the surgeon connects to the ultrasound endoscope 10 while viewing the image displayed on the CRT monitor. The puncture needle device 30 can be operated accurately. That is, the first stopper member 61 and the rear end fixing member 66 are slid, or the stylet 76 is moved forward and backward with respect to the puncture needle 71 by releasing the screwing with respect to the rear end fixing member 66 of the stylet support cap 75. The sheath 64, the puncture needle 71, and the stylet 76 can be accurately operated.
When the treatment by 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 annular lock member 50 is first rotated to the unlock position, and each elastic opening and closing piece 37 is rotated. , 38 are open and elastically deformable. In this state, when the cylindrical connecting portion 31 is moved to the stylet support cap 75 side along the axis, the flange portion 18 of the base 17 presses the elastic opening and closing pieces 37 and 38 to the outer peripheral side so as to be in the open state. However, since the holes formed by the inner peripheral surfaces of the elastic opening and closing pieces 37 and 38 are passed forward, the removal work of the cylindrical connecting portion 31 from the base 17 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 front shape of the groove formed by the flange portion 18 formed in the base 17 and each rotation-preventing groove 40 may not be the above shape as long as it is non-circular. Alternatively, the annular flange 19 may be a non-annular projecting member that projects from the outer periphery of the base 17 without being annular.
Furthermore, the number of the slits 35 and the deformation assisting holes 36 (the number of elastic opening / closing pieces 37 and 38) formed in the cylindrical connecting portion 31 is not limited as long as it is two or more. Further, when the cylindrical connecting portion 31 is made of a material that is easily elastically deformed, the deformation assisting hole 36 may be omitted.
Furthermore, the engagement protrusion 44 may be formed on the annular lock member 50 side, and the engagement recess 53 may be formed on the elastic opening / closing pieces 37 and 38 side.

Moreover, it is also possible to implement in a modified example as shown in FIG.
In this modification, both front and rear surfaces of a rotation prevention groove 80 (slide restriction portion; the front shape is the same as the rotation prevention groove 40) formed in each elastic opening and closing piece 37, 38 are closed, and the rear surface of the rotation prevention groove 80 is restricted from insertion. The part 81 and the front face are a retaining part 82. And when the collar part 18 of the nozzle | cap | die 17 fits in each rotation prevention groove | channel 80, both the front and back both surfaces of the collar part 18 are pinched | interposed (contacted) by the insertion control part 81 and the retaining part 82 of each rotation prevention groove | channel 80. As shown in the figure, even if the insertion restricting portion 41 of each elastic opening and closing piece 37, 38 is separated from the annular flange 19, the movement of the cylindrical connecting portion 31 in the axial direction with respect to the base 17 is completely prevented (rotation is also possible). Prevented). Furthermore, since one surface of the flange portion 18 contacts the insertion restricting portion 81 and the other surface of the flange portion 18 contacts the retaining portion 82, the cylindrical connection portion 31 is prevented from falling with respect to the base 17. In addition, in order to prevent the cylindrical connection part 31 from moving in the axial direction relative to the base 17 and falling down more reliably, when the cylindrical connection part 31 is connected to the base 17, The insertion restricting portion 41 may be brought into contact with the annular flange 19.

DESCRIPTION OF SYMBOLS 10 Ultrasonic endoscope 11 Operation part 12 Ultrasonic probe 13 Insertion part 14 Bending part 15 Bending operation lever 16 Protrusion part 17 for insertion of treatment tool A base 18 A collar part 19 Annular flange (flange)
20 Internal conduit 21 Treatment instrument opening 30 Puncture needle device 31 Cylindrical connecting part 32 Slider support hole 33 Female screw hole 34 Intermediate circular hole 35 Slit 36 Deformation auxiliary hole 37 38 Elastic opening / closing piece 39 Slide restricting part 39a Inclined surface 40 Anti-rotation Groove 41 Insertion restricting portion 42 Stopping portion 43 Locking groove 44 Engaging projection 46 Locking groove 47 Non-contact groove 50 Annular lock member 51 Rotating contact portion 52 Inner flange 53 Engaging recess 60 First slider 61 First stopper member 63 First fixing screw member 64 Sheath 65 Second slider 66 Rear end fixing member 68 Second stopper member 69 Second fixing screw member 71 Puncture needle 72 Opening 75 Stylet support cap 76 Stylet 80 Anti-rotation groove (slide restricting portion)
81 Insertion restriction part 82 Stopping part

Claims (5)

A cylindrical connection part that can be inserted into a predetermined position in the internal space with a base having a non-circular collar projecting from the ultrasonic endoscope body,
A flexible sheath that, when inserted into the internal space, passes through the inside of the base and is inserted into the internal conduit of the ultrasonic endoscope;
A puncture needle inserted into the sheath so as to be able to advance and retract;
In a puncture needle device for an ultrasonic endoscope comprising:
Elastically deformable from a closed state aligned on the circumference to an open state that moves from the closed state to the outer peripheral side, formed so as to be aligned on a specific circumference at the end of the cylindrical connection portion connected to the base. A plurality of elastic opening and closing pieces,
When the base is formed in the elastic opening and closing piece and in the open state, the base is allowed to slide relative to the cylindrical connection portion, and when the base is inserted to the predetermined position and is located in the closed state. A slide restricting portion for restricting relative sliding of the base;
The flange formed on the inner peripheral surface of each elastic opening and closing piece is engaged with the collar when the base is inserted to the predetermined position and is in contact with the circumferential surface of the collar when in the closed state. A stop groove,
An annular lock supported on the outer peripheral surface of the elastic opening / closing piece and capable of rotating and moving between an unlocking position allowing the elastic opening / closing piece to be deformed to the open state and a lock position holding the elastic opening / closing piece in the closed state. Members,
A puncture needle device for an ultrasonic endoscope, comprising: The puncture needle device for an ultrasonic endoscope according to claim 1,
The slide restricting part is
When the elastic opening / closing piece is in the closed state with the base inserted to the predetermined position, the stopper that contacts the flange and restricts the sliding of the flange to the ultrasonic endoscope body side. And
When the elastic opening / closing piece is positioned in the closed state with the base inserted to the predetermined position, the flange comes into contact with the flange located on the ultrasonic endoscope body side from the flange projecting from the base. An insertion restricting portion for restricting further insertion of the base;
A puncture needle device for an ultrasonic endoscope comprising: The puncture needle device for an ultrasonic endoscope according to claim 1,
The slide restricting part is
A puncture needle device for an ultrasonic endoscope, which is the inner surface of the anti-rotation groove, which comes into contact with both front and back surfaces of the collar when the elastic opening / closing piece is in the closed state with the base inserted to the predetermined position . The puncture needle device for an ultrasonic endoscope according to any one of claims 1 to 3,
An engagement protrusion is formed on one of the outer peripheral surface of the elastic opening and closing piece and the inner peripheral surface of the annular lock member, and the other is engaged with the engagement protrusion when the annular lock member moves to the lock position. A puncture needle device for an ultrasonic endoscope in which an engaging recess is formed. The puncture needle device for an ultrasonic endoscope according to any one of claims 1 to 4,
When the annular lock member is located at the unlocked position on a part of the inner circumferential surface of the annular lock member, a gap is formed between the elastic lock piece and the elastic open / close piece. An inner side that allows deformation to the open state and restricts deformation of the elastic opening / closing piece to the open state by contacting the outer peripheral surface of the elastic opening / closing piece when the annular lock member is located at the lock position. A puncture needle device for an ultrasonic endoscope in which a flange is formed.

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