JP4578868B2 - Endoscopic puncture needle - Google Patents

Description

  The present invention relates to an endoscope puncture needle for collecting a living tissue by puncturing a target site through a transendoscope.

  In recent years, a long puncture needle has been guided to an observation site through a treatment instrument channel through which a treatment instrument such as a forceps is inserted using an ultrasonic tomogram as a guide while observing an ultrasonic tomogram with an ultrasonic endoscope. A technique for puncturing a diseased tissue, collecting a body tissue, and making a pathological confirmation diagnosis is performed.

A puncture needle for performing such a diagnosis is disclosed in Patent Document 1, for example. In this puncture needle, a stylet with a sharp tip is removably disposed in an elongated needle tube having a sharp tip, and the needle tube is observed while observing an ultrasonic image. When the target site is reached, the stylet is withdrawn from the suction cap, and a syringe or the like is connected to the suction cap to suck the tissue in the body cavity.
JP 2003-190179 A

  As disclosed in Patent Document 1, in the conventional puncture needle, the needle tube is punctured with the stylet stored in the needle tube until the needle tube reaches the target site, and the needle tube reaches the target site. The tissue can be aspirated and collected for the first time by completely pulling out the stylet. That is, when the stylet is in the needle tube, the suction passage in the needle tube cannot be secured. Therefore, it is necessary to fully pull out the stylet to secure the suction passage.

  For this reason, when aspirating the tissue into the needle tube, it is necessary to perform a troublesome operation such as mounting a syringe after securing a storage place for the stylet pulled out from the needle tube. Furthermore, when inspecting the collected tissue, the stylet once removed may be used again to push out the tissue in the needle tube, and must be stored with great care so that the stylet is not contaminated. was there.

  The present invention has been made in view of the above circumstances, and it is not necessary to completely pull out a stylet when puncturing a target site with a puncture needle into a target site, and it has excellent operability and handleability. It aims at providing the puncture needle for endoscopes.

To achieve the above object, endoscopic puncture needle that by the present invention comprises a sheath inserted retractably into the channel for treatment tool of an endoscope, is movably inserted into the sheath, the target region A hollow needle tube that is inserted into the needle tube so as to be able to advance and retreat, and is blocked so as to prevent the tissue from entering the inside from the tip opening of the needle tube. A closing member that can be ventilated when sucking and collecting the body, an operation part body that is detachably fixed to the channel inlet for the treatment instrument of the endoscope, and the needle tube that can be moved forward and backward with respect to the operation part body The slider includes: a slider to be held; and a connecting member that is provided at a rear end of the slider and pulls the closing member from the distal end opening of the needle tube toward the hand side.

  The puncture needle for an endoscope according to the present invention does not require the stylet to be completely pulled out when the puncture needle is punctured at the target site and the tissue is aspirated and collected, thereby improving operability and handling. .

  Embodiments of the present invention will be described below with reference to the drawings. 1 to 9 relate to a first embodiment of the present invention, FIG. 1 is an overall configuration diagram of an endoscope apparatus, FIG. 2 is an external view of an endoscope puncture needle, and FIGS. 3 and 4 are needle tubes. FIG. 5 is an explanatory diagram showing the configuration of the puncture needle for endoscope, FIG. 6 is an explanatory diagram showing the internal configuration of the operation unit, and FIG. 7 is a cross-sectional view showing the periphery of the fixing screw of the stopper unit. FIG. 8 is a detailed view of the stopper portion shown in the section AA in FIG. 6, and FIG. 9 is a detailed view of the slider base end portion shown in an enlarged view of the B portion in FIG.

  In the present embodiment, an endoscope apparatus 1 shown in FIG. 1 includes an ultrasonic transducer (for example, an ultrasonic transducer such as a convex type) 3 for transmitting and receiving ultrasonic waves at its distal end. The basic configuration includes an endoscope 2 and an ultrasonic observation device 15 that generates an ultrasonic image by driving and scanning the ultrasonic transducer 3, processing an echo signal, and the like. The ultrasonic endoscope 2 has an endoscope puncture needle (hereinafter simply referred to as “puncture needle”) for puncturing the observation site and collecting body tissue and fluid under observation of an ultrasonic image. 20 can be detachably mounted.

  The ultrasonic endoscope 2 has an elongated flexible insertion portion 4 to be inserted into a body cavity. The ultrasonic endoscope 2 includes an ultrasonic transducer 3 on the distal end side of the insertion portion 4 and is operated on the rear end side. A part 5 and an eyepiece part 6 are provided. A universal cord 7 is extended from the side of the operation unit 5, and an ultrasonic connector 8 connected to the ultrasonic observation device 15 is provided at the end of the universal cord 7. A light source cable 9 is branched from the middle portion of the universal cord 7, and an endoscope connector 10 connected to a light source device (not shown) is provided at the end of the light source cable 9.

  In addition, at the distal end side of the operation section 5 of the ultrasonic endoscope 2, an inlet cap 11 for a treatment instrument channel for inserting a treatment instrument such as a forceps is provided. The puncture needle 20 is detachably screwed and fixed to the inlet base 11 of the treatment instrument channel, and protrudes into the ultrasonic scanning plane of the ultrasonic transducer 3 as described below. By puncturing the target site with the needle tube 22 thus made, body tissue or body fluid can be collected.

  As shown in FIG. 2, the puncture needle 20 includes a sheath 21 to be inserted into a treatment instrument channel of an endoscope, an operation unit 30 serving also as a gripping portion disposed at a proximal end portion of the sheath 21, and the operation An elongated and pipe-shaped needle tube 22 that is inserted and disposed in the sheath 21 through the portion 30 so as to freely advance and retract is mainly configured. The needle tube 22 is formed of, for example, a stainless steel pipe and has a sharp end.

  In this embodiment, the puncture needle 20 is configured as a disposable type, and the sheath 21 is formed of a resin member such as polyethersulfone or Teflon (registered trademark) that can reduce the cost. Polyethersulfone and Teflon (registered trademark) are properly used depending on the application.

  In addition, a plurality of annular grooves 23,..., 23, which are annular grooves, are provided on the surface of the needle tube 22 at a predetermined position at the tip, for example, in a staggered arrangement. The annular grooves 23,..., 23 reflect a large number of reflected echoes of the ultrasonic waves emitted from the ultrasonic transducer 3 by the ultrasonic transducer 3, thereby allowing the tip portion of the needle tube 22 provided with the circular grooves to be formed. The ultrasonic image is clearly depicted on the observation image, and the positional relationship and distance between the needle tube 22 and the target site can be measured with high accuracy.

  As shown in FIGS. 3 and 4, in the needle tube 22, instead of a conventional stylet, an axial wire 24 extending from a rear end (a connecting member 41 described later) of the operation unit 30, and the axial wire 24. A closing member 26 comprising a ventilation member 25 which is fixed to the tip of the gas and has air permeability is disposed. The shaft wire 24 is formed with a diameter sufficiently smaller than the inner diameter of the needle tube 22 in order to secure an intake passage in the needle tube 22. The ventilation member 25 is formed to have an outer diameter substantially equal to the inner diameter of the needle tube 22 or an outer diameter slightly larger than the inner diameter of the needle tube 22 and having elasticity in at least the radial direction of the needle tube 22. It is formed so that ventilation between the intake passage 27 formed between the shaft wire 24 and the outside of the needle tube 22 is possible.

  As the ventilation member 25, for example, a brush member 25A as shown in FIG. 3 or a sponge-like porous member 25B as shown in FIG. 4 can be adopted. The brush member 25A is formed by twisting a stranded wire or a single wire of bristle formed of polyamide (nylon) or the like into the tip portion of the shaft wire 24 to form a cylindrical shape. Are formed of an open cell body in which bubbles existing in each other are connected to each other, and is formed of thermoplastic polyurethane, latex, or the like.

  Such a closing member 26 closes the distal end opening of the needle tube 22 by the ventilation member 25 disposed in the distal end opening of the needle tube 22 and prevents the body tissue from entering the interior, By pulling toward the hand side, it is possible to secure a space for the ventilation member 25 to retreat from the tip of the needle tube 22 to suck and collect body tissue. Therefore, since it is not necessary to completely pull out the body tissue from the operation unit 30 when aspirating and collecting body tissue, there is no complication in handling and good operability can be obtained.

  Next, the configuration of the puncture needle 20 will be specifically described with reference to FIGS. FIG. 5 shows a state in which the distal end portion of the needle tube 22 is disposed in the sheath 21.

  As shown in FIGS. 5 and 6, the operation section 30 is provided with an operation section main body 31 formed of a resin member to which the base end portion of the sheath 21 is fixed, and slidable with respect to the operation section main body 31. The slider 32 is mainly composed of a resin member and a stopper 33 that can set the sliding distance of the slider 32 with respect to the operation unit main body 31 to a desired value according to the measurement result. The stopper 33 includes a stopper member 33a that is slidably disposed with respect to the operation portion main body 31, and a fixing screw 33b that is screwed to the stopper member 33a to fix the stopper member 33a at a desired position. For example, the stopper member 33a is formed of a resin material, and the fixing screw 33b is formed of a metal material.

  The operation portion main body 31 has a long and narrow pipe shape in which a flange portion 31a is formed at the proximal end portion, and a resin connection portion 34 to which the proximal end portion of the sheath 21 is fixed is bonded and fixed to the distal end portion. . On the distal end side of the connecting portion 34, a double thread (internal thread) 34a that is connected and fixed to the inlet base 11 of the treatment instrument channel of the ultrasonic endoscope 2 is formed. A recess 34b is formed in which the tip of the part main body 31 is fitted. The sheath 21 is fixed to a boss portion 34c provided at the connection portion 34.

  As shown in FIGS. 6 and 7, an O-ring 36 that holds a guide pipe 35 described later is disposed in the circumferential recess on the inner peripheral surface of the flange portion 31 a. In addition, a notch step portion 31b having a flat portion with which the tip surface of the fixing screw 33b abuts is formed at a predetermined position on the outer peripheral surface on the tip side of the flange portion 31a. When the product is shipped, the distal end surface of the fixing screw 33b is brought into contact with the flat surface portion of the notch step portion 31b with a predetermined torque. Placed in. In this arrangement state, the distal end portion of the needle tube 22 is arranged in the sheath 21. Even if the slider 32 is moved to the tip side due to the influence of some external force, the side portion of the fixing screw 33b comes into contact with the rising portion of the notch step portion 31b and the movement of the slider 32 to the tip side is stopped. . In the contact state, naturally, the tip of the needle tube 22 does not protrude from the tip of the sheath 21.

  As shown in FIG. 8, a sliding groove 31 c is formed at a predetermined position on the outer peripheral surface of the operation section main body 31 and serves as a guide groove when the stopper member 33 a is slid in the longitudinal direction. Further, as shown in FIG. 4, a plurality of scales 31 d,..., 31 d are provided on the outer peripheral surface of the operation unit main body 31 as a guide when setting the arrangement position of the stopper member 33 a. These scales 31d are formed at predetermined intervals by, for example, laser marking.

  The stopper member 33a is formed with a convex portion 33c that is engaged with the sliding groove 31c. As a result, the stopper member 33a slides in the longitudinal direction with respect to the operation portion main body 31. Then, the sliding distance of the slider 32 is set by sliding the stopper member 33a to the position shown in FIG. 5 and screwing the fixing screw 33b to fix the stopper member 33a.

  As shown in FIGS. 5 to 7, the slider 32 is formed in a stepped pipe shape in which a narrow diameter portion 32a is formed at the base end portion. A plurality of recesses 32b are formed at predetermined positions on the outer peripheral surface of the slider 32 in consideration of gripping properties. A slide arrangement member 37 for slidably arranging the slider 32 with respect to the operation unit main body 31 is bonded and fixed to the tip of the slider 32.

  On the other hand, as shown in FIGS. 6 and 9, the narrow diameter portion 32 a on the proximal end side of the slider 32 has a proximal end portion of the needle tube 22 and a base of a guide pipe 35 whose distal end portion is held by an O-ring 36. An end portion is integrally fixed, and a resin suction cap member 38 communicating with the inside of the needle tube 22 is erected in a direction substantially orthogonal to the slider 32 behind the proximal end portion of the needle tube 22. Further, a resin connecting member 39 is fixed coaxially with the slider 32 at the rear end of the portion where the suction base member 38 of the small diameter portion 32 a is erected. Note that the suction cap member 38 and the connection member 39 may be formed integrally with the slider 32.

  A shaft wire 24 connected to the ventilation member 25 is inserted into the connection member 39, and a sealing member 40 for maintaining airtightness is interposed between the outer periphery of the shaft wire 24 and the inner peripheral surface of the connection member 39. Has been. The end of the shaft wire 24 protruding from the seal member 40 is fixed to a connecting member 41 detachably attached to the connecting member 39, and the connecting member 41 can pull the ventilation member 25 toward the hand side.

  The puncture needle 20 configured as described above is sterilized and sterilized after assembling the constituent members and stored in a sterilization bag (not shown). In this stored state, since the stopper 33 is disposed at the notch step portion 31b which is the initial position, it is possible to prevent the distal end of the needle tube 22 from protruding from the distal end of the sheath 21 and causing a problem in the sterilization bag.

  Next, how to use the puncture needle 20 will be described. First, the puncture needle 20 accommodated in the sterilization bag is taken out. Then, the sheath 21 is inserted into the treatment instrument channel of the ultrasonic endoscope 2. Then, an ultrasonic image of the distal end portion of the sheath 21 is clearly depicted on the ultrasonic observation image displaying the target site. Here, the positional relationship between the distal end of the sheath 21 and the target site is set, and then the distance between the distal end of the sheath 21 and the target site is measured.

  Next, the fixing screw 33b is loosened, and the stopper member 33a is slid on the operation portion main body 31 with reference to the scale 31d so as to correspond to the measured distance. When the stopper member 33a is moved to a predetermined position, the fixing screw 33b is fastened. . Thereafter, the operator grasps the slider 32 and quickly moves the slider 32 toward the stopper 33. This ensures that the tip of the needle tube 22 is punctured into the target site.

  When it is confirmed that the needle tube 22 has reached the target site, the shaft wire 24 is pulled together with the connecting member 41 to move the ventilation member 25 connected to the shaft wire 24 by a predetermined amount. As a result, a space for taking in body tissue inside the tip of the needle tube 22 is secured. Thereafter, a syringe or the like (not shown) is connected to the suction cap member 38 to suck the body tissue. By this suction, the body tissue enters the needle tube 22 and the tissue is collected.

  When inspecting the tissue collected in the needle tube 22, a positive pressure is applied to the needle tube 22 by a syringe or the like to push out the tissue. Further, although depending on the rigidity of the shaft wire 24, the tissue in the needle tube 22 can be pushed out by moving the ventilation member 25 to the distal end side of the needle tube 22 via the connecting member 41. After the inspection is completed, the puncture needle 20 is discarded.

  As described above, when the tissue is aspirated / collected into the needle tube 22, the tissue can be aspirated / collected by simply pulling the ventilation member 25 at the distal end of the needle tube 22 toward the proximal side. Therefore, it is possible to eliminate the trouble of completely pulling out the conventional stylet and paying attention to the storage location and storage state, and it is possible to improve the operability and handling and shorten the inspection time. .

  Next, a second embodiment of the present invention will be described. 10 to 11 relate to a second embodiment of the present invention, FIG. 10 is an explanatory view showing a distal end portion of a needle tube, and FIG. 11 is an enlarged view of a main portion of a slider base end portion.

  In the first embodiment described above, instead of the conventional stylet, a closing member 26 made up of the shaft wire 24 and the ventilation member 25 is disposed in the needle tube 22, and the closing member 26 is pulled into the proximal side by a predetermined amount. In the second embodiment, a hollow stylet 50 is provided in the needle tube 22 as shown in FIG. 10, and the hollow style is obtained. The tissue at the observation site is aspirated and collected inside the let 50. Hereinafter, the different parts of the configuration from the first embodiment are mainly described.

  As shown in FIG. 10, the stylet 50 includes a pipe-shaped stylet body 51 and a tip member 52 formed in the same manner as the tip shape of a conventional stylet. A tip member 52 is fixed to the end, and is configured to seal the tip opening of the stylet body 51. The tip member 52 is appropriately set in accordance with the purpose of use, such as a shape matching the blade surface shape of the needle tube 22, a shape having a sharp tip, etc., in addition to a substantially hemispherical tip shape as shown in FIG. .

  A notch 51a is provided on the rear outer peripheral surface of the portion of the stylet main body 51 where the distal end member 52 is fixed, over a predetermined length in the axial direction, and the notch 51a is exposed from the needle tube 22. This secures a suction line for taking the body tissue into the stylet body 51. In order to suck tissue into the stylet body 51 through this suction pipe, the configuration of the base end portion of the slider 32 is changed with respect to the first embodiment in this embodiment.

  That is, as shown in FIG. 11, a connection member 53 in which the shape of the connection member 39 of the first form is changed is fixed to the small diameter portion 32 a of the slider 32, and the needle tube 22 is connected to the distal end portion of the connection member 53. The base end portion and the base end portion of the guide pipe 35 are integrally fixed. The stylet body 51 in the needle tube 22 is inserted through the connection member 53 via a seal member 54 that keeps the space between the outer periphery of the stylet body 51 and the inner peripheral surface of the connection member 53, and protrudes from the connection member 53. Has been.

  The end of the stylet body 51 protruding from the connecting member 53 is fixed to a connecting member 55 that is detachably attached to the connecting member 53, and opens into a suction base 55 a formed integrally with the connecting member 55. ing. A syringe or the like is connected to the suction base portion 55a during suction biopsy. Other configurations are the same as those of the first embodiment.

  In the above configuration, when the needle tube 22 is punctured into the target site and the tissue is sucked and collected, the stylet 50 is pushed out from the needle tube 22 via the connecting member 55 (the needle tube 22 is retracted with respect to the stylet 50). As shown in FIG. 10, by exposing the notch 51 a of the stylet body 51 from the needle tube 22, tissue can be sucked and collected into the stylet body 51.

  Therefore, unlike the conventional case, it is possible to eliminate the trouble of completely pulling out the stylet when aspirating and collecting the tissue and paying attention to the storage location and storage state. Thus, the inspection time can be shortened by improving the property and the handling property.

  In this case, as shown by a broken line in FIG. 10, a burr 51b may be provided at the tip of the notch 51a. By providing the burr 51b, when the stylet 50 is drawn into the needle tube 22 after the suction is completed, the surrounding cells can be scraped, and the tissue can be collected more effectively.

  Next, a third embodiment of the present invention will be described. 12 to 13 relate to a third embodiment of the present invention, FIG. 12 is an explanatory view showing the distal end portion of the needle tube, and FIG. 13 is an enlarged view of a main portion of the slider base end portion.

  The third embodiment uses the blocking member 26 and the hollow stylet 50 by providing a check valve that can be opened only in the suction direction at the distal end opening of the needle tube, in contrast to the first and second embodiments described above. Without sucking the tissue at the observation site inside the needle tube.

  As shown in FIG. 12, the needle tube 60 of the third embodiment is provided with an opening 60b having a diameter smaller than the inner diameter of the hollow pipe-shaped needle tube main body 60a on the blade surface at the tip, and an opening on the back side of the opening 60b. A valve seat is formed on the periphery. Further, a thin plate-like valve body 61 that is in close contact with and separated from the valve seat is provided, and one end of the valve body 61 is fixed to the pin 62.

  Depending on the opening shape of the opening 60b, the valve body 61 is formed in an oval shape, a circular shape, a rectangular shape or the like according to the opening shape, and the pin 62 fixed to one end side is connected to the upper back surface of the opening portion 60b. By supporting in the direction orthogonal to the longitudinal axis of the needle tube 60 on the side, a plate valve having the pin 62 as a rotation fulcrum is configured. Then, by introducing a positive pressure into the needle tube 60, the valve element 61 is pressed against and closely adhered to the valve seat against the force in the valve opening direction that acts when puncturing the living tissue, thereby maintaining the valve open state. By introducing a suction negative pressure into the needle tube 60, the valve element 61 is caused to function as a check valve that opens away from the valve seat.

  In this case, positive pressure is not used to hold the valve body 61 in a closed state, and, for example, elasticity is provided between the valve body 61 and the inner wall surface of the needle tube 60 as shown by a broken line in the figure. An elastic member 63 such as a thin plate may be interposed, and the valve body 61 may be pressed against the valve seat on the rear surface side periphery of the opening 60b by the elastic force of the elastic member 63 to close the valve. The elastic member 63 only needs to be fixed to one of the valve body 61 and the inner wall surface of the needle tube 60, and the valve body 61 itself is formed of an elastic member so as to have the function of the elastic member 63. Also good. In order to open the valve body 61 that is closed by being pressed by the valve seat by the elastic force, a wire 64 is fixed to the end of the valve body 61, and the wire 64 is pulled to the proximal side to open the valve body 61. Can be made.

  In general, the above needle tube 60 is formed separately from the needle tube main body 60a only in the portion where the check valve is provided. In FIG. 12, the check valve is an example of a plate valve having the pin 62 as a rotation fulcrum. However, the check valve may be a reed valve type check valve formed of an elastic thin plate material. Similarly, the valve check valve can be closed by a positive pressure introduced into the needle tube 60 and opened by a negative pressure.

  The configuration of the base end portion of the slider 32 is the configuration described in the first embodiment (see FIG. 9) and the configuration described in the second embodiment (see FIG. 11) when the valve body 61 is opened and closed by negative pressure and positive pressure. ) Can be adopted, but basically, as shown in FIG. 13, the stylet main body 51 and the connecting member 55 are eliminated from the configuration of the slider base end portion of the second form. It can be simplified. That is, the base end portion of the needle tube 60 and the base end portion of the guide pipe 35 are integrally fixed to the connection member 53 fixed to the small diameter portion 32 a of the slider 32. Other configurations are the same as those of the first and second embodiments.

  At the time of aspiration biopsy, a syringe or the like is connected to the connection member 53 and positive pressure is applied to the needle tube 60 to maintain the valve body 61 in a closed state, and it is confirmed that the needle tube 60 has reached the target site. At this time, by applying suction with a syringe as it is, as shown in FIG. 12, the valve body 61 at the tip of the needle tube 60 is opened and the tissue can be sucked and collected.

  When the valve body 61 is maintained in a closed state by elastic force and is forced to open by pulling the wire 64, the configuration of the base end portion of the slider 32 is basically the diagram of the first embodiment. The configuration can be the same as the configuration of 9. That is, the shaft wire 24 in the first embodiment corresponds to the wire 64, and the ventilation member 25 corresponds to the valve body 61. Therefore, the operation when aspirating and collecting tissue in the needle tube 60 may be the same as that in the first embodiment, and the valve connected to the wire 64 by pulling the wire 64 together with the connecting member 41 to the proximal side. The body 61 is opened, and the body tissue can be sucked by the syringe connected to the suction cap member 38.

  In the 3rd form, the stylet or the member similar to the stylet is abolished, and the operability and the handleability can be improved and the inspection time can be shortened like the 1st and 2nd forms described above. In addition, since the tip of the needle tube is sealed with a valve until the needle tube reaches the target site, unnecessary tissue other than the target site can be prevented from being mixed, which improves the inspection accuracy. Can contribute.

  Next, a fourth embodiment of the present invention will be described. FIGS. 14 and 15 are explanatory views showing the distal end portion of the needle tube according to the fourth embodiment of the present invention.

  In the fourth embodiment, the opening at the tip of the needle tube is configured to be openable and closable as in the third embodiment, and the body tissue is sucked and collected inside the needle tube. In the fourth embodiment, a check valve at the tip of the needle tube is used. Instead, the tip of the needle tube is sealed with a sealing member that can be opened during biopsy suction.

  That is, as illustrated in FIG. 14, the distal end opening of the needle tube 22 is sealed by adhering or welding a film-like thin film 70 as a sealing member to the distal edge surface of the needle tube 22. In this case, the third embodiment of the needle tube 60 provided with a valve body 61 that opens and closes by pressure at the tip is replaced with a needle tube 22 whose tip is sealed with a thin film 70.

  The thin film 70 has a strength that is not damaged by a pressing force when the needle tube 22 is punctured into a living tissue, and is formed so as to be broken when a negative pressure is applied to the inside of the needle tube 22. That is, when the distal end of the needle tube 22 reaches the target site, suction is applied to the inside of the needle tube 22 by a syringe or the like connected to the connection member 53, whereby the thin film 70 is broken and a biopsy is possible.

  Further, as illustrated in FIG. 15, the tip blade surface portion of the needle tube 22 is filled with a sealing member 71 made of a material that dissolves in the living body, for example, a saccharide material without adversely affecting the living body. Anyway. The filling amount of the sealing member 71 is set as appropriate so that the opening is secured during suction in consideration of the depth of the target site and the biopsy time.

  In the fourth embodiment, as with the previous embodiments, not only can the operability and handling be improved to shorten the inspection time, but also the tip of the needle tube is completely sealed, It is possible to more reliably prevent unnecessary tissues other than the target site from being mixed, thereby contributing to improvement in inspection accuracy.

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

FIG. 1 is an overall configuration diagram of an endoscope apparatus according to a first embodiment of the present invention. Same as above, external view of puncture needle for endoscope Same as above, explanatory view showing the tip of the needle tube Same as above, explanatory view showing the tip of the needle tube The same as above, Explanatory drawing which shows the structure of the puncture needle for endoscopes Same as above, explanatory diagram showing the internal configuration of the operation unit Same as above, cross-sectional view around the fixing screw of the stopper Same as above, detailed view of the stopper section shown in the section AA in FIG. Same as above, detailed view of slider base end portion shown in B section enlargement in FIG. Explanatory drawing which shows the front-end | tip part of a needle tube concerning 2nd Embodiment of this invention. Same as above, enlarged view of the main part of the slider base end Explanatory drawing which shows the front-end | tip part of a needle tube concerning 3rd Embodiment of this invention. Same as above, enlarged view of the main part of the slider base end Explanatory drawing which concerns on 4th Embodiment of this invention and shows the front-end | tip part of a needle tube. Same as above, explanatory view showing the tip of the needle tube

Explanation of symbols

2 Ultrasound endoscope 20 Puncture needle 21 Sheath 22 Needle tube 24 Axial wire 25 Venting member 25A Brush member 25B Porous member 26 Closure member 31 Operation part main body 32 Slider 41 Connecting member 50 Stylet 51a Notch part 53 Connecting member 55 Connection Member 60 Needle tube 61 Valve body 70 Thin film 71 Sealing member
Agent Patent Attorney Susumu Ito

Claims (4)

A sheath that is inserted into a treatment instrument channel of an endoscope so as to freely advance and retract;
A hollow needle tube that is inserted into the sheath so as to freely advance and retreat, is punctured at a target site, and sucks and collects tissue.
An occlusion member that is inserted into the needle tube so as to be able to advance and retreat , obstructs the tissue from entering from the tip opening of the needle tube, and allows ventilation when aspirating and collecting the tissue ;
An operation unit main body detachably fixed to a treatment instrument channel inlet of the endoscope;
A slider for holding the needle tube movably forward and backward with respect to the operation unit main body;
A connecting member provided at the rear end of the slider, and for pulling the closing member from the distal end opening of the needle tube toward the proximal side;
A puncture needle for an endoscope, comprising: The closing member, and composed of a shaft wire that will be fixed to the coupling member, is fixed to the distal end of the shaft wire and vent member having air permeability,
The shaft wire is formed to have a diameter smaller than the inner diameter of the needle tube, thereby allowing ventilation between the suction passage formed between the inner diameter side of the needle tube and the shaft wire and the outside of the needle tube. The puncture needle for an endoscope according to claim 1, wherein the puncture needle is an endoscope.   The puncture needle for an endoscope according to claim 2, wherein the ventilation member is constituted by a brush member formed by twisting brush hairs at a distal end portion of the shaft wire.   The puncture needle for an endoscope according to claim 2, wherein the ventilation member is a porous member made of an open cell provided at a distal end portion of the shaft wire.

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