JPH0238726Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a puncture needle used for organ puncture under ultrasonic ecography control.

(Conventional technology) Ultrasonic diagnostic equipment is a technology developed in Japan, but with subsequent advances in medical electronics and the computer processing technology that underpins it, the image resolution of ultrasound diagnostic equipment has improved markedly. There is something. This advancement in the image resolution of ultrasound diagnostic equipment has had a major impact on the traditional organ puncture method for diagnosis and treatment, changing from the conventional blind puncture method to ultrasonic ecography management. This led to a major development in organ stabbing, leading to real-time stabbing under the hood. However, the needles that are often used for organ puncture under ultrasonic ecography control have a very thin outer diameter of around 0.7 mm, and the wavelength of the ultrasound used in medical ultrasound diagnostic equipment is not suitable for organ puncture. Because the diameter is equal to the outer diameter of the needle used in the ultrasound system, contrast performance is low, and if the sensitivity of the ultrasonic diagnostic equipment itself is increased too much to capture the needle on the screen, images of important organs will be impaired. For this reason,
Clinicians have been eagerly awaiting the development of a puncturing needle with high ultrasound contrast, specifically for organ puncturing under the supervision of ultrasound ecography.

Under these circumstances, attempts to develop a needle with high contrast performance for ultrasound were first made because a needle that has been used repeatedly over a long period of time and has scratches on its outer surface is more sensitive than a new needle that is being used for the first time. The study was started based on the knowledge of a clinician who noticed the phenomenon of high contrast enhancement for sound waves.

In other words, some clinicians who noticed this phenomenon decided to use a third
An attempt was made to intentionally scratch the needle on multiple sides, as shown in the figure. However, although this method achieved higher contrast performance, there was a risk of breakage during use, and cancer cells could adhere to the wound formed on the outer surface of the needle when puncturing a cancerous lesion, causing the needle to become damaged. There is a risk of dispersing cancer cells to other organs when the needle is removed from the body, and although it is effective in accurately reaching the target site, the needle's high contrast performance after reaching the target site is However, it has the disadvantage that it actually interferes with the image diagnosis of organs.

In order to overcome these drawbacks, attempts have been made to scratch the outer surface of the inner needle of the needle. However, the outer diameter of the inner needle was small, only around 0.4 mm, so almost no improvement in contrast was observed. The main reason for this is that the purpose of scratching the outer surface of the needle is based on the principle that the scratches reflect ultrasound waves, but if the scratches are equivalent to the wavelength of ultrasound, the wavelength This is because a scratch on the inner needle, which has only about half the diameter of the inner needle, cannot reflect light effectively. Furthermore, due to the difference in diameter, it is impossible to make a wound of the same depth on the inner needle as on the outer needle.

(Problems to be solved by the present invention) For this reason, the present invention has been developed to provide a highly contrast-enhancing transducer for ultrasound during organ puncture under ultrasonic ecography control, which does not have the above-mentioned drawbacks. The purpose is to obtain a needle.

(Means for Solving the Problems) The pricking needle according to the present invention consists of an inner needle having a notch at its tip, and an outer needle having an inner diameter that is in close contact with the outer diameter of the inner needle. The high contrast performance of this device is due to the air layer that exists between the notch formed at the tip of the inner needle and the outer needle whose inner diameter is in close contact with the outer surface of the inner needle, which effectively transmits ultrasound waves. Obtained by reflecting the The reason why the inner needle and outer needle must be in tight contact is because, as a characteristic of organs such as the kidney and bladder, pressure exists within the organ, and body fluids and blood can enter the body through the gap between the outer needle canal and the inner needle. This is to prevent the contrast from flowing into the cutout of the needle and causing the contrast to be degraded and lost. Therefore, the inner and outer needles do not need to be in close contact at all locations, but
It must be in close contact at least near the tip. By forming one or more cutouts in the inner needle in the axial direction of the needle tube with a length longer than the outer diameter of the outer needle, the reflective area and volume are larger than in the method of scratching the outer surface of the outer needle. Therefore, high contrast performance can be obtained.

〔Example〕

Figure 1 shows an embodiment of the present invention, approximately 20 cm
It consists of an outer needle 1 made of steel and an inner needle 2 fitted into the outer needle 1, the bases of which are fixed to synthetic resin needle bases 3 and 4, respectively. The outer diameter of each needle is around 0.7mm for the former and 0.4mm for the latter.

FIG. 2 is an enlarged cross-sectional view of the distal end portion of the needle, and the cut ends of both needles coincide to form the same slope, and the outer circumference of the inner needle 2 that follows this slope is in close contact with the inner wall of the outer needle 1. 5 is approximately 4 mm to 18 mm from the tip of inner needle 2
This is a concave notch provided between mm and is formed by cutting and removing the needle wall of this part of the inner needle from the circumferential surface to the axis.

In the case of the above embodiment, the concave notch 5 is formed with a length of 14 mm in the axial direction of the needle tube, but this length may be increased or decreased to some extent. Furthermore, the appropriate depth of resection is one-third or more of the thickness of the needle. If the amount is too low, the contrast effect will be reduced, which is not preferable.
Further, the number of notches is not limited to one, and a plurality of notches may be provided at intervals.

(Effect) When an organ is punctured using this needle under ultrasonic ecography control, the position of the tip of the needle can be clearly seen due to the presence of the recessed part, making the intended diagnosis or treatment easier. I can do it.

(Effects of the Invention) Since the present invention is configured as described above, all of the above-mentioned drawbacks are eliminated. That is, since the outer needle has no scratches, there is no risk of breakage during use or the risk of spreading cancer cells. Furthermore, since the inner needle is removed after the needle reaches the target site, the contrast properties of the needle are lost at that point, and this does not interfere with diagnosis or treatment.

[Brief explanation of the drawing]

Fig. 1 is a side view showing the whole of the pricking needle according to the present invention, Fig. 2 is an enlarged sectional view of the tip portion, and Fig. 3 is a side view of a part of the pricking needle for explaining the prior art. . 1...Outer needle, 2...Inner needle, 5...Concave cutout.

Claims (1)

[Scope of Claim for Utility Model Registration] A pricking needle consisting of an outer needle 1 made of steel and an inner needle 2 that is closely inscribed and inserted into the outer needle 1 at least at the outer circumferential sliding surface near the tip, the outer circumferential sliding surface of the inner needle A recessed notch 5 having a length equal to or longer than the outer diameter of the outer needle is provided at a location near the tip behind the contact surface position.
is provided in the axial direction of the needle, whereby an air layer is formed between the inner needle and the outer needle at the position of the recessed notch.