JP3904299B2 - Ultrasound puncture needle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ultrasonic puncture needle used for introduction into a body cavity through an insertion channel of an endoscope to perform suction biopsy, injection, or the like.
[0002]
[Prior art]
Conventionally, in order to examine and diagnose the affected part in the body cavity, deep organs such as the pancreas, liver, kidney and the like from the digestive tract wall of the stomach and duodenum using a puncture needle while observing the inside of the body cavity with an ultrasonic endoscope A method of collecting tissue or body fluid in a body cavity by puncturing with a puncture needle has been performed. In this method, the puncture needle is projected under the ultrasonic image by reflecting the ultrasonic wave at the puncture needle.
[0003]
By the way, in order to make the reflection of the ultrasonic wave in a puncture needle stronger, the thing of various structures is proposed to the following prior art. Japanese Utility Model Laid-Open No. 56-113510 discloses a technique in which a reflection mark of an ultrasonic beam is provided on an inner cylindrical needle, and Japanese Utility Model Laid-Open No. 63-109109 has a concave portion provided at a position from the tip of the inner needle. In addition, a device capable of effectively reflecting ultrasonic waves by a layer of air existing between the recessed portion and the outer needle having an inner diameter closely contacting the outer surface of the inner needle is disclosed.
[0004]
In addition, PCT / WO89 / 11250 discloses a surgical instrument having a rough outer surface, and EP 0,386,936 discloses an echo reflecting instrument in which a sphere is embedded in the outer surface or a dent is provided. It is disclosed.
[0005]
[Problems to be solved by the invention]
(Disadvantages of the prior art)
However, in the case of such a method using an ultrasonic endoscope, since the outer diameter of the puncture needle is less than 1 mm, the reflection of ultrasonic waves by the puncture needle is not sufficient (super The contrast property with respect to the sound wave is low), and a clear puncture needle image cannot be projected under the ultrasonic image, and safe and reliable puncture cannot be performed.
[0006]
In particular, Japanese Utility Model Laid-Open Nos. 56-113510 and 63-109109 have poor reflection and scattering of ultrasonic waves, and the position of the needle under the ultrasonic image is not clearly projected. Further, in PCT / WO89 / 11250 and EP0,386,936, as shown in FIG. 6 showing a cross-section of the puncture needle, the inclination of the dent 35 is gentle, so that the ultrasonic wave emitted from the ultrasonic transducer 36 is supersonic. The sound wave 37 was scattered too much and the reflection returning to the ultrasonic transducer 36 as an echo signal was weak, and the position of the needle was not clearly projected.
[0007]
(Object of invention)
The present invention has been made paying attention to the above-mentioned problems, and the object of the present invention is for ultrasonic waves that can be punctured safely and reliably by clearly displaying the position under an ultrasonic image. It is to provide a puncture needle.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the invention of claim 1 is directed to an ultrasonic puncture needle that is inserted into an insertion channel of an ultrasonic endoscope so as to freely advance and retract, and punctures a tissue in a body cavity with a needle body. The surface has a cylindrical protrusion that is a part of the surface of the needle body and an annular groove formed by cutting out the periphery of the cylindrical protrusion, and the groove is a cross section perpendicular to the axial direction of the needle body. The groove is defined by a linear ridge line that intersects an acute angle with respect to the ridge line corresponding to the side surface of the cylindrical protrusion .
The invention of claim 2 is the invention of claim 1, wherein a plurality of grooves are provided.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
<First Embodiment>
A first embodiment of the present invention will be described with reference to FIGS.
(Constitution)
FIG. 1 is a view showing a state where an ultrasonic puncture needle according to a first embodiment of the present invention is inserted through an insertion channel of an endoscope, FIG. 2 is a cross-sectional view of the puncture needle tip side, and FIG. 3 is a puncture needle proximal end 4 is a partial cross-sectional view of the puncture needle tip side, FIG. 5 is a cross-sectional view taken along the line AA of FIG. 4, and FIG.
[0010]
As shown in FIG. 1, the ultrasonic puncture needle 1 is used by being inserted through an insertion channel (not shown) of an endoscope 2. As shown in FIG. 2, the distal end side of the ultrasonic puncture needle 1 is inserted into a sheath 3 having a flexible wound coil 4 and is inserted into the sheath 3 so as to be able to advance and retract. The needle body 5 is formed of a thin stainless steel tube or the like and has a sharp tip shape 5 and a stylet 6 having a sharp tip shape that can be inserted into and removed from the needle body 5. The close-wound coil 4 constituting the sheath 3 has its end faces in close contact with each other without a gap, and the distal end portion of the sheath 3 is in close contact with the rear end portion of the tip member 7.
[0011]
On the other hand, as shown in FIG. 3, the proximal end side of the puncture needle 1 is constituted by an operation portion main body 10 made of a relatively thick hollow member, and the sheath 3 is inserted into the hole portion 11 provided on the distal end side of the operation portion main body 10. The base end of is fitted. A through hole 12 having a lumen is provided in the operation unit main body 10, and an O-ring 13 made of an elastic member is fixed to the inner peripheral surface of the base end side portion of the through hole 12. A groove-shaped fixing portion 14 is provided.
[0012]
The proximal end portion of the needle body 5 is connected to the slider 15, and the needle body 5 can be moved forward and backward in the longitudinal direction of the operation section main body 10 by manually operating the slider 15. On the outer peripheral surface of the slider 15, a concave portion 16 and a concave portion 17, each of which is a circular groove, are formed so as to be selectively fitted to the O-ring 13. The front recess 16 is formed at a position where the needle body 5 is housed in the sheath 3 by fittingly engaging with the O-ring 13 when the slider 15 is pulled toward the hand side. Yes.
The rear concave portion 17 is formed at a position where the needle body 5 is engaged with the O-ring 13 in a state where the needle body 5 protrudes most from the sheath 3. That is, the stopper means for restricting the maximum protrusion amount of the needle body 5 is formed by these configurations.
[0013]
A hollow hole 20 communicating with the inside of the needle body 5 is formed inside the slider 15, and a connection port 21 whose inner surface is tapered is formed at the base end portion of the slider 15. The tapered connection port 21 is detachably connected to a tapered convex portion 23 provided on the knob 22, and the convex portion 23 is connected to the base end portion of the stylet 6. That is, the stylet 6 is inserted into the hollow hole 20 and the needle body 5 integrally with the knob 22. In addition, a syringe barrel (not shown) can be connected to the connection port 21.
[0014]
By the way, although the needle body 5 is reflected under the ultrasonic image by reflecting the ultrasonic wave, in the present invention, in order to clearly project the needle body 5, the surface of the needle body 5 as shown in FIG. A large number of annular grooves 30 are provided. The annular groove 30 is formed by cutting out the periphery of the needle 5 while leaving a cylindrical protrusion 31 that is a part of the surface of the needle body 5, and the cross-sectional shape becomes an acute angle as shown in FIG. ing. Since the cross-sectional shape of the annular groove 30 is an acute angle, the ultrasonic wave 33 emitted from the ultrasonic transducer 32 is more likely to return to the ultrasonic transducer 32 as an echo signal, compared to the dent 35 as shown in FIG. Thus, the groove 30 portion of the needle body 5 is clearly projected under the ultrasonic image.
[0015]
(Function)
In order to collect tissue in the body cavity using the puncture needle 1 configured in this way, first, the puncture needle 1 is not shown in the endoscope 2 in a state where the needle body 5 is pulled into the sheath 3. The distal end is protruded into the body cavity through the insertion channel. Then, when the tip of the sheath 3 is brought close to the target site, the slider 15 is manually operated and pushed. At this time, the protruding length of the needle body 5 becomes a certain amount by fitting the O-ring 13 into the recess 17 on the rear side of the slider 15.
[0016]
At this time, since a large number of annular grooves 30 are provided on the surface of the needle body 5, the portion of the grooves 30 of the needle body 5 is clearly projected under the ultrasonic image. Therefore, it is possible to puncture safely and reliably until the target site is reached while confirming the position of the tip of the needle body 5. When the needle body 5 reaches the target position, the stylet 6 is pulled out together with the knob 22, and then a syringe barrel (not shown) is connected to the connection port 21 to suck the tissue in the body cavity. By this suction, the tissue in the body cavity enters the needle body 5, and biopsy of the deep tissue site is achieved.
[0017]
(effect)
As described above, according to the present embodiment, since a large number of annular grooves 30 having a sharp cross-sectional shape are provided on the surface of the needle body 5, the ultrasonic waves 33 emitted from the ultrasonic transducer 32 are used. Is easily returned to the ultrasonic transducer 33 as an echo signal, and the needle body 5 is clearly projected under the ultrasonic image, and safe and reliable puncture can be performed.
[0018]
<Additional notes>
1. In an ultrasonic puncture needle that is inserted into an insertion channel of an ultrasonic endoscope so as to be able to advance and retract, and punctures a tissue in a body cavity with a needle body,
An ultrasonic puncture needle, wherein a plurality of annular grooves are provided on the surface of the needle body.
[0019]
2. The ultrasonic puncture needle according to Additional Item 1, wherein the annular groove is formed by leaving a part of the surface of the needle body and notching the periphery thereof.
[0020]
3. The ultrasonic puncture needle, wherein the annular groove has a sharp cross-sectional shape.
[0021]
【The invention's effect】
As described above, according to the present invention, since a large number of annular grooves 30 having a sharp cross-sectional shape are provided on the surface of the needle body 5, the needle body 5 is clearly projected under the ultrasonic image, Safe and reliable puncture can be performed.
[Brief description of the drawings]
FIG. 1 is a diagram showing a state in which an ultrasonic puncture needle according to a first embodiment of the present invention is inserted through an insertion channel of an endoscope. FIG. 2 is a cross-sectional view of a puncture needle tip side. Cross-sectional view of the end side [FIG. 4] Partial cross-sectional view of the puncture needle tip side [FIG. 5] AA cross-sectional view of FIG. 4 [FIG.
DESCRIPTION OF SYMBOLS 1 Endoscopic puncture needle 5 Needle body 30 Toroidal groove 31 Projection part 32 Ultrasonic transducer 33 Ultrasonic wave

Claims (2)

In an ultrasonic puncture needle that is inserted into an insertion channel of an ultrasonic endoscope so as to be able to advance and retreat, and punctures tissue in a body cavity with a needle body, a cylindrical shape that is a part of the surface of the needle body is formed on the surface of the needle body And an annular groove formed by cutting out the periphery of the protrusion, and the groove has a ridge corresponding to the side surface of the cylindrical protrusion in a cross section orthogonal to the axial direction of the needle body. On the other hand, the ultrasonic puncture needle is a groove defined by a linear ridge line intersecting an acute angle .   The ultrasonic puncture needle according to claim 1, wherein a plurality of the annular grooves are provided.

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