JP5467777B2 - Ultrasound endoscope puncture needle and manufacturing method thereof - Google Patents

Description

  The present invention relates to a puncture needle for an ultrasonic endoscope that is guided into a body cavity through a treatment instrument insertion channel of an ultrasonic endoscope and used for collection of a living tissue, injection of a drug solution, and the like, and a manufacturing method thereof.

  The tip of the needle tube of the puncture needle for an ultrasonic endoscope, which is guided into the body cavity through the treatment instrument insertion channel of the ultrasonic endoscope, is ultrasonicated by an ultrasonic probe placed at the tip of the ultrasonic endoscope. It protrudes into the sound wave scanning region and is observed as a reflected echo image of an ultrasonic wave together with a tomographic image of a living tissue.

  However, since the tip of the needle tube of the puncture needle for ultrasonic endoscope protruding into the body is a thin one having a diameter of less than 1 mm, for example, the reflected echo intensity of the ultrasonic wave is extremely small, and a clear ultrasonic image of the needle tube There are many cases where you cannot get.

  Therefore, by forming the outer peripheral surface near the tip of the needle tube into a rough surface with fine irregularities by sandblasting, the reflected echo intensity of the ultrasonic wave can be increased and a clear ultrasonic echo image of the needle tube can be obtained. There exists what was made like this (for example, patent document 1).

JP 5-123331 A

  When manufacturing the needle tube, a step of cutting the material pipe obliquely into a pointed state is required before or after the outer peripheral surface near the tip of the needle tube is formed into a rough surface with fine irregularities by sandblasting.

  However, there are many cases where burrs or the like remain in the most distal portion of the needle tube cut obliquely in this way. Therefore, conventionally, the entire needle tube has been washed after a so-called chemical polishing treatment in which the tip of the needle tube is finally immersed in a chemical solution such as a strong acid.

  However, when such a chemical polishing process is performed, the protruding portions of the fine irregularities formed on the surface of the needle tube by the sand blasting process are rounded as illustrated in FIG. As a result, the reflection intensity of the ultrasonic echo is reduced, and the clarity of the ultrasonic echo image of the needle tube is reduced.

  The present invention provides an ultrasonic endoscope that can produce a needle tube capable of obtaining a clear ultrasonic echo image without increasing the cost without smoothing unevenness formed by sandblasting on the outer peripheral surface of the needle tube. An object is to provide a puncture needle for a mirror and a method for manufacturing the same.

In order to achieve the above object, the puncture needle for an ultrasonic endoscope of the present invention includes a needle tube that is punctured into a living tissue, and an ultrasonic wave that is inserted into and removed from a treatment instrument insertion channel of the ultrasonic endoscope. In the puncture needle for an endoscope, the outer peripheral surface in the vicinity of the tip of the needle tube is a rough surface processed by subjecting a surface that has been previously subjected to chemical polishing or electrolytic polishing to sand blasting .

  It should be noted that the outer peripheral surface near the tip of the needle tube may leave the rough surface state formed by sandblasting as it is, and the needle tube may be inserted in the flexible sheath so as to be movable back and forth in the axial direction. .

The method for manufacturing a puncture needle for an ultrasonic endoscope of the present invention includes an ultrasonic endoscope that includes a needle tube that is punctured into a living tissue and is inserted into and removed from a treatment instrument insertion channel of the ultrasonic endoscope. in the manufacturing method of use needle, after cutting the tip of the material pipe of the needle tube diagonally from subjected to chemical polishing or electrolytic polishing to the tip portion of the needle tube, the outer peripheral surface near the tip of the needle tube above Sandblasting is performed on the portion subjected to the chemical polishing or the electrolytic polishing .

  When the outer peripheral surface near the tip of the needle tube is subjected to sandblasting, the tip cut portion of the needle tube is preferably covered with a protective mask so as not to be sandblasted.

According to the present invention, the outer peripheral surface near the tip is processed into a rough surface by sand blasting after chemical polishing or electrolytic polishing is performed in the vicinity of the tip of the needle tube, thereby forming on the outer peripheral surface of the needle tube by sand blasting. A needle tube capable of obtaining a clear ultrasonic echo image without smoothing the unevenness can be manufactured without increasing the cost.

It is a perspective view of the front-end | tip part of the puncture needle for ultrasonic endoscopes in the Example of this invention. It is a microscopic enlarged sectional view of the rough surface area of the puncture needle for an ultrasonic endoscope in an embodiment of the present invention. 1 is an overall configuration diagram of a puncture needle for an ultrasonic endoscope in an embodiment of the present invention. It is a microscopic expanded sectional view of the rough surface area | region of the conventional puncture needle for ultrasonic endoscopes.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 3 shows that the puncture needle 10 for an ultrasonic endoscope is inserted into a treatment instrument insertion channel 21 of a known ultrasonic endoscope 20, and the distal end portion of the puncture needle 10 for an ultrasonic endoscope is a treatment instrument insertion channel. The state which protruded from the front-end | tip part of 21 is shown. Reference numeral 23 denotes an ultrasonic probe arranged at the distal end of the insertion portion 22 of the ultrasonic endoscope 20.

  The puncture needle 10 for an ultrasonic endoscope has a configuration in which a flexible needle tube 12 is inserted and disposed in a flexible sheath 11 detachably inserted into a treatment instrument insertion channel 21 so as to advance and retreat in the axial direction. ing. As the needle tube 12, for example, a thin-walled stainless steel pipe or other metal pipe material can be used.

  Examples of the flexible sheath 11 include a flexible tube such as a tetrafluoroethylene resin tube and a PEEK (polyether ether ketone) resin tube, or a coil pipe in which a stainless steel wire is wound in a tubular shape with a certain diameter. Can be used.

  A cylindrical gripping portion 13 is connected to the base end of the flexible sheath 11, and a needle base 14 connected to the base end of the needle tube 12 protrudes outward from the base end portion of the gripping portion 13. . The needle tube 12 and the needle base 14 are slidable in the axial direction with respect to the flexible sheath 11 and the grip portion 13, and the flexible sheath 11 is operated by sliding the needle base 14 with respect to the grip portion 13. The tip of the needle tube 12 can be protruded from the tip 11a.

  Therefore, when inserting / removing the flexible sheath 11 into / from the treatment instrument insertion channel 21, the needle tube 12 is immersed in the distal end 11a of the flexible sheath 11, and as shown in FIG. When the distal end 11 a of the sheath 11 protrudes from the distal end of the treatment instrument insertion channel 21, the needle tube 12 is protruded from the distal end 11 a of the flexible sheath 11, the distal end of the needle tube 12 is punctured into the living tissue, and the needle base 14 is injected. A tube or the like can be connected to perform aspiration collection of a biological tissue, injection of a drug solution, or the like.

  The distal end portion of the needle tube 12 protruding in the ultrasonic scanning range 30 of the ultrasonic probe 23 is observed as a reflected echo image of ultrasonic waves together with a tomographic image of a living tissue, and is displayed on a monitor screen (not shown). The image is drawn.

  FIG. 1 is an enlarged view of the distal end portion of the needle tube 12 of such a puncture needle for an ultrasonic endoscope. The outer diameter (diameter) of the needle tube 12 is, for example, about 0.6 to 0.8 mm, and the wall thickness is, for example, about 0.1 mm.

  When the needle tube 12 is manufactured, first, the tip of a metal pipe material such as a stainless steel pipe material that is a material of the needle tube 12 is cut obliquely into a sharp and sharp state by machining. 12a is the tip cut portion.

  Next, the tip portion of the needle tube 12 including the entire tip cut portion 12a is subjected to a chemical polishing process in which it is immersed in a strongly acidic chemical solution such as a sulfuric acid solution, so that burrs generated during machining of the tip cut portion 12a are removed. Dissolve and remove. Note that an electrolytic polishing process or the like may be performed instead of the chemical polishing process.

  Then, after the chemical polishing treatment is finished, the outer peripheral surface of the region near the tip of the needle tube 12 is subjected to sandblasting to form the surface of the needle tube 12 into a rough surface with fine irregularities. 12b is the rough surface area.

  Since the sandblasting method for the needle tube 12 is known from JP-A-5-123331 and the like, detailed description thereof is omitted, but the diameter of the beads used for the sandblasting process is, for example, about 0.1 to 0.2 mm.

  When the sandblasting process is performed, the tip cut portion 12a of the needle tube 12 is covered with a protective mask (not shown) so that the tip cut portion 12a is not sandblasted. By doing so, the sharpness of the tip cut portion 12a does not deteriorate. As the protective mask, for example, a silicon tube or the like can be used.

  When the sandblasting process is completed, the protective mask is removed, and then the needle tube 12 is ultrasonically cleaned with isopropyl alcohol or the like that does not dissolve, thereby completing the processing step of the tip portion of the needle tube 12.

  In the rough surface region 12b formed on the outer peripheral surface near the tip of the needle tube 12 in this way, the rough surface state composed of fine irregularities formed by sandblasting is completely smoothed as shown in FIG. 2, for example. It is left as it is. As a result, the function of increasing the reflected echo intensity of the ultrasonic wave is sufficiently exerted, and a clear ultrasonic echo image of the needle tube 12 can be obtained.

  In addition, since the sharpness of the tip cut portion 12a is not adversely affected, and a new processing step for manufacturing the needle tube 12 is not required as compared with the prior art, a highly functional needle tube 12 can be obtained without any cost increase.

  In addition, this invention is not limited to the said Example, For example, although the needle tube 12 may be a single pipe, it formed by superimposing several pipe materials from which a diameter differs in more than double. It can be a thing.

DESCRIPTION OF SYMBOLS 10 Ultrasound endoscope puncture needle 11 Flexible sheath 12 Needle tube 12a Tip cut part 12b Rough surface area 20 Ultrasound endoscope 21 Treatment instrument insertion channel 23 Ultrasound probe

Claims (5)

In a puncture needle for an ultrasonic endoscope that includes a needle tube that is punctured into a biological tissue and is inserted into and removed from a treatment instrument insertion channel of the ultrasonic endoscope,
Puncture for an ultrasonic endoscope characterized in that the outer peripheral surface near the tip of the needle tube is a rough surface processed by subjecting a surface that has been previously subjected to chemical polishing or electrolytic polishing to sand blasting needle.   The puncture needle for an ultrasonic endoscope according to claim 1, wherein the outer peripheral surface in the vicinity of the tip of the needle tube is left in a rough state formed by sandblasting.   The puncture needle for an ultrasonic endoscope according to claim 1 or 2, wherein the needle tube is inserted and disposed in the flexible sheath so as to be movable forward and backward in the axial direction. In a method of manufacturing a puncture needle for an ultrasonic endoscope that includes a needle tube that is punctured into a living tissue and is inserted into and removed from a treatment instrument insertion channel of the ultrasonic endoscope.
After cutting the leading end of the material pipe of the needle tube diagonally from subjected to chemical polishing or electrolytic polishing to the tip portion of the needle tube, the chemical polishing treatment or the electrolytic polishing of the outer circumferential surface near the tip of the needle tube A method for producing a puncture needle for an ultrasonic endoscope, characterized in that a sandblast treatment is performed on the site subjected to the treatment. The puncture needle for an ultrasonic endoscope according to claim 4, wherein when the outer peripheral surface near the tip of the needle tube is subjected to sandblasting, the tip cut portion of the needle tube is covered with a protective mask so as not to be sandblasted. Production method.

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