JPH1176254A - Puncture needle for ultrasonic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To project the position of a needle clearly under an ultrasonic image and to perform puncture safely and reliably by providing multiple annular grooves on the surface of the body of the needle. SOLUTION: Multiple annular grooves 30 are provided on the surface of the body 5 of an ultrasonic puncture needle 1 so that the body 5 may be projected clearly. The annular grooves 30 leave cylindrical protrusions 31 on the surface of the needle body 5, and their cross sections are formed acutely by notching the surroundings. Thus the acute angle cross sections make echo signals of ultrasonic waves 33 from an ultrasonic vibrator 32 return to the ultrasonic vibrator 32 easily. Therefore, the grooves 30 of the needle body 5 are projected clearly under an ultrasonic image, making it possible to carry out puncture safely and reliably.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic puncture needle which is introduced into a body cavity through an insertion channel of an endoscope and used for performing a suction biopsy, an injection, or the like.

[0002]

2. Description of the Related Art Conventionally, in order to inspect and diagnose a diseased part in a body cavity, a puncture needle is used to observe the inside of the body cavity with a puncture needle while observing the inside of the body cavity with the use of a puncture needle. 2. Description of the Related Art A method of puncturing a deep organ such as a kidney with a puncture needle to collect a tissue or a body fluid in a body cavity has been performed. in this way,
When the ultrasonic waves are reflected by the puncture needle, the puncture needle is projected under the ultrasonic image.

[0003] Incidentally, in order to further enhance the reflection of ultrasonic waves from the puncture needle, various structures having the following prior arts have been proposed. 56-135510
Japanese Patent Application Laid-Open No. 63-109109 discloses an inner cylinder needle provided with a reflection mark of an ultrasonic beam. In Japanese Utility Model Laid-Open Publication No. 63-109109, a concave notch is provided at a position from the tip of the inner needle. It is disclosed that an ultrasonic wave can be effectively reflected by a layer of air existing between an inner needle and an outer needle having an inner diameter which is in close contact with the outer surface of the inner needle.

In PCT / WO89 / 11250,
A surgical instrument having a roughened outer surface is disclosed.
P0, 386, 936 discloses an echo-reflecting device in which a sphere is embedded in the outer surface or a dent is provided.

[0005]

[Problems to be solved by the invention]

(Defects 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 the ultrasonic wave by the puncture needle is not sufficient. However, the image of the puncture needle could not be clearly displayed under the ultrasonic image, and safe and reliable puncture could not be performed.

[0006] In particular, in Japanese Utility Model Laid-Open No. 56-135510 and Japanese Utility Model Laid-Open No. 63-109109, the reflection and scattering of ultrasonic waves are so weak that the position of the needle on the ultrasonic image is not clearly displayed. Was. In the case of PCT / WO89 / 11250 and EP0,386,936, as shown in FIG. 6 showing the cross section of the puncture needle, the dent 35 has a gentle inclination, so that the ultrasonic wave emitted from the ultrasonic transducer 36 is used. The sound wave 37 was scattered too much and the reflection returning to the ultrasonic transducer 36 as an echo signal was weak, so that the position of the needle was not clearly displayed.

(Object of the Invention) The present invention has been made in view of the above-mentioned problem, and an object of the present invention is to provide a safe and reliable puncture by clearly displaying its position under an ultrasonic image. It is an object of the present invention to provide an ultrasonic puncture needle capable of performing the above.

[0008]

According to the present invention, there is provided an ultrasonic puncture needle which is inserted into an insertion channel of an ultrasonic endoscope so as to be able to advance and retreat, and punctures a tissue in a body cavity with a needle. , Wherein a plurality of annular grooves are provided on the surface of the needle body. With such a configuration, it is possible to provide an ultrasonic puncture needle that can perform safe and secure puncture by being clearly projected.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION

<First Embodiment> A first embodiment of the present invention will be described with reference to FIGS. (Configuration) FIG. 1 is a view 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 the distal end side of the puncture needle, and FIG. FIG. 4 is a partial sectional view of the distal end side of the puncture needle, FIG. 5 is a sectional view taken along line AA of FIG. 4, and FIG.

As shown in FIG. 1, the ultrasonic puncture needle 1 comprises:
It is used by being inserted into an insertion channel (not shown) of the endoscope 2. As shown in FIG. 2, a distal end side of the ultrasonic puncture needle 1 has a sheath 3 made of a tightly wound coil 4 having flexibility.
The needle 5 is inserted into the sheath 3 so as to be able to advance and retreat, and has a sharp tip made of a flexible thin stainless steel tube or the like, and the needle 5 is insertable into and removable from the needle 5. It is constituted by a stylet 6 having a sharp shape. Sheath 3
The end faces of the tightly wound coil 4 are closely contacted with no gap, and the distal end of the sheath 3 is in close contact with the rear end of the tip member 7.

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 a hole 11 provided at the distal end side of the operation portion main body 10 is provided. The base end portion of the sheath 3 is fitted to the first end. A through-hole 12 having a lumen is provided inside the operation unit main body 10, and an O-ring 13 made of an elastic member is fixed to an inner peripheral surface of a base end portion of the through-hole 12. A groove-shaped fixing portion 14 is provided.

The proximal end of the needle body 5 is connected to a slider 15, and by manually operating the slider 15,
The needle body 5 can be moved forward and backward in the longitudinal direction of the operation section main body 10. An O-ring 13 is provided on the outer peripheral surface of the slider 15.
Recesses 16 each comprising a circumferential groove, which selectively fits with
And the recess 17 are formed apart from each other in the front and rear directions. And
The front concave portion 16 engages with the O-ring 13 when the slider 15 is pulled toward the hand side, and connects the needle body 5 to the sheath 3.
It is formed at a position where it can be housed inside. The rear concave portion 17 is formed at a position where the needle body 5 protrudes most from the sheath 3 to engage with the O-ring 13. That is, with these configurations, stopper means for regulating the maximum protrusion amount of the needle body 5 is formed.

A hollow hole 20 communicating with the inside of the needle body 5 is formed inside the slider 15.
A connection port 21 having an inner surface tapered is formed at the base end portion of No. 5. The tapered connection port 21 is detachably connected to a tapered projection 23 provided on a knob 22.
The convex portion 23 is connected to the base end 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. An unillustrated syringe or the like can be connected to the connection port 21.

By the way, the needle 5 is projected under the ultrasonic image by reflecting the ultrasonic wave. In the present invention, in order to clearly project the needle 5, as shown in FIG. 5, a number of annular grooves 30 are provided on the surface. The annular groove 30 has a cylindrical projection 31 which is a part of the surface of the needle body 5 and is notched around the periphery thereof.
The shape of the cross section is an acute angle as shown in FIG. Since the cross-sectional shape of the annular groove 30 is an acute angle, the ultrasonic wave 33 emitted from the ultrasonic vibrator 32 is more likely to return to the ultrasonic vibrator 32 as an echo signal than the dent 35 as shown in FIG. Thus, the portion of the groove 30 of the needle body 5 is clearly projected under the ultrasonic image.

(Operation) In order to collect a body cavity or the like using the puncture needle 1 configured as described above, first, the puncture needle 1 is pulled inside the sheath 3 while the needle body 5 is pulled into the sheath 3. The endoscope 2 is inserted through an insertion channel (not shown) of the endoscope 2 so that the distal end side protrudes into the body cavity. Then, when the distal end of the sheath 3 approaches a target portion, the slider 15 is manually operated and pushed. At this time, the O-ring 13 is fitted into the concave portion 17 at the rear of the slider 15, so that the protruding length of the needle body 5 becomes constant.

At this time, the annular groove 3 is formed on the surface of the needle body 5.
Since a large number of zeros are provided, the portion of the groove 30 of the needle body 5 is clearly displayed under the ultrasonic image. Therefore, it is possible to perform puncture safely and reliably until reaching the target site while checking the position of the distal end of the needle body 5. When the needle body 5 reaches the target position, the stylet 6
Then, a syringe (not shown) or the like is connected to the connection port 21 to suck the tissue in the body cavity. By this suction, tissue in the body cavity enters the needle body 5, and a biopsy of a deep tissue site is achieved.

(Effects) 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 emitted ultrasonic wave 33 easily returns to the ultrasonic vibrator 33 as an echo signal, and the needle body 5 is clearly displayed under the ultrasonic image, so that safe and reliable puncturing can be performed.

<Supplementary items> An ultrasonic puncture needle which is inserted into an insertion channel of an ultrasonic endoscope so as to be able to advance and retreat freely and punctures tissue in a body cavity with a needle, wherein a plurality of annular grooves are provided on the surface of the needle. Ultrasonic puncture needle.

2. The ultrasonic puncture needle according to claim 1, wherein the annular groove is formed by leaving a part of the surface of the needle body and notching the periphery thereof.

3. The puncture needle for ultrasonic waves, wherein the annular groove has an acute cross section.

[0021]

As described above, according to the present invention, a large number of annular grooves 3 having a sharp cross section are formed on the surface of the needle body 5.
Since 0 is provided, the needle body 5 is clearly projected under the ultrasonic image, and puncture can be performed safely and reliably.

[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 has been inserted into an insertion channel of an endoscope.

FIG. 2 is a sectional view of the tip side of a puncture needle.

FIG. 3 is a sectional view of the proximal end side of the puncture needle.

FIG. 4 is a partial cross-sectional view of the tip side of the puncture needle.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 is a diagram showing a conventional technique.

[Explanation of symbols]

 Reference Signs List 1 puncture needle for endoscope 5 needle body 30 annular groove 31 protruding part 32 ultrasonic transducer 33 ultrasonic

Claims (1)

[Claims] 1. An ultrasonic puncture needle which is inserted into an insertion channel of an ultrasonic endoscope so as to be able to advance and retreat, and punctures a tissue in a body cavity with a needle, wherein a plurality of annular grooves are provided on the surface of the needle. An ultrasonic puncture needle provided.