RU63209U1 - DEVICE FOR PUNCTIONAL BIOPOSY OF THE THYROID GLAND - Google Patents

Abstract

The utility model relates to medicine, to surgery, and can be used to obtain tissue material for morphological studies. We first proposed a puncture device, which is an injection needle, inside which is another injection needle with a mandrin. A smaller diameter needle fits snugly against the inside of the larger needle. There is a trapezoidal cutout on the lateral surface of the inner needle, giving it the appearance of a harpoon.

Description

The utility model relates to medicine, to surgery, and can be used to obtain tissue material for morphological studies.

Currently, to perform a fine-needle aspiration biopsy of thyroid tissue, syringe needles with a diameter of 25G to 18G are used [Schlumberger M.J. Fine-Needle Aspiration Biopsy of the Thyroid Gland // Eur. j. Endocrmol. - 2004 - Vol. 150, No. 2. - P.105-120]. These needles allow you to get material for cytological examination. Most domestic authors note the low accuracy of this method when using conventional syringe needles, which is associated with a small amount of the studied material and its destruction during aspiration.

To increase the accuracy of the study, trepanbiopsy is used, which allows obtaining material for histological examination. With this method of sampling the material, a modified Silverman needle is used (Copyright certificate N244853 of 07.14.72). The method allows you to accurately determine the type of nodular lesion of the thyroid gland, however, due to the large diameter of the outer needle (2 mm) it requires the use of anesthesia and is dangerous due to the risk of bleeding.

Closest to the proposed model is an injection needle with a diameter of 18G, which is used for fine-needle aspiration

biopsies are the vast majority of domestic authors. The disadvantages of this method of sampling the following. When a needle is inserted, all layers of tissue fall into its lumen up to the maximum depth of immersion. In this case, dense plugs may form in the lumen of the needle, which prevent the aspiration of deeper tissues. In addition, these tissues by their presence in the biopsy, as well as the aspiration process with the destruction of the tissue structure, reduce the accuracy of the cytological examination.

We first proposed a puncture device, which is an injection needle, inside which is another injection needle with a mandrin. A smaller diameter needle fits snugly against the inside of the larger needle. There is a trapezoidal cutout on the side surface of the inner needle, giving it the appearance of a harpoon.

The proposed device is presented in figure 1, where

1 - mandren

2 - inner needle

3 - outer needle.

When the device is assembled, the end surfaces of both needles and the mandrel form one plane.

In order to obtain material, the device in assembled form is supplied under ultrasound control to the thyroid gland node, which requires morphological examination. Mandrin (1) extends a distance greater than the diameter of the node, after which the inner needle (2) moves into the node. The latter moves in the site by translational and circular motions, after which it is removed through the outer needle (3), which remains hollow. In this case, the cutout in the inner

the needle captures the tissue of the node, which, after removing the needle, is pushed out of it with the help of a mandrel onto a glass slide for morphological examination. This procedure can be performed repeatedly without removing the outer needle, which allows tissue from various sites of the site to be taken from one puncture of the skin.

The proposed device allows to obtain tissue material from the required depth in sufficient quantities for cytological examination. Along with this, in 18% of cases using this device we were able to obtain material for histological examination. A multifocal biopsy increases the sensitivity of the method, but does not affect the morbidity, since biopsy samples are extracted through a single puncture with a sufficiently thin needle. Due to the lack of aspiration, the tissue structure is preserved.

Claims (1)

Device for puncture biopsy of the thyroid gland, containing an injection needle, characterized in that a second injection needle with a mandrin is located inside it, a trapezoidal opening is made on its lateral surface.