SU1809758A3 - Trochar for puncture biopsy - Google Patents

Description

The invention relates to medical equipment, namely to instruments for sampling soft tissues, and can be used for research and diagnostic purposes.

The aim of the invention is to preserve the morphological structure of the sample by capturing a certain amount of material.

Figure 1 shows a trocar, a General view; figure 2 is the same, a longitudinal section in its original position; in Fig.3 - the position of the mandrel when pulling the inner needle from the original to the working position; figure 4 - the position of the working part of the mandrel at the time of extraction of material from the recess of the mandrel.

The trocar contains a hollow guide needle 1 with a holder 2 and ending with a sharpened oblique slice 3.

The needle holder has a groove 4 for fixing the parts of the trocar in the initial position (figure 2) and a groove 5 for installing the parts of the trocar in the working position (Fig.Z). Inside the guide needle, an internal hollow needle 6 with a handle 7. is installed. It has a fixing pin 8 for fixing the inner needle relative to the guide needle 1 in the initial and working positions, as well as a groove 9 for fixing the mandrel handle 10 in the initial position. The working part 11 of the inner needle 6 is made in the form of a harpoon, which allows you to cut a column of biopsy specimen without violating its morphological structure.

Inside the hollow inner needle 6 insert. flax mandrin 12 with a handle 10 having a pin 13 for fixing the mandrel in its original position. The working part of the mandrel 12 is made in the form of a harpoon, which cuts off the channel of the inner needle 6 with its slice to form a cavity 14 for accommodating biological material. Moreover, the size of the recess on the mandrel is fully consistent with the size of the working end of the needle (Fig.Z).

When preparing the trocar for operation, the needle 6 is inserted into the hollow guide needle 1 so that the pin 8 of the handle 7 fits into the groove 4 of the holder 2 of the needle 1 and the pin _g> 13 of the handle of the mandrel 10 fits fully into the groove 9 of the handle 7. B In this position, the slice of the mandrel 12 coincides with the slice of the hollow inner needle 6 and the slice 3 of the guide needle 1 (Fig. 2).

After the introduction of the trocar into the tissue to the proposed pathological focus using the handle 7, the pin 8 is removed from the groove 4 and rotate the inner 15 of the needle 6 relative to its longitudinal axis 180 degrees. The pin is inserted into the groove 5, securing the details of the trocar in a position that allows the sampling of the material. By pressing on the handle of the mandrel 10 20 and, accordingly, on the handle 7 of the inner needle 6, the latter is moved deeper into the tissues. As a result of immersion, the surrounding tissues fill the cavity 14 of the inner needle 6 and the mandrel 12. The material is grabbed by mutual movement of the needles towards each other (Fig. 2,4). In this case, the sharp edge of the oblique cut 3 of the needle 1 and the sharp edge of the hole of the inner needle 6 cut off the material located in the cavity 14.

The biopsy is completed by extraction of the trocar from the tissues. First, the needle 6 is removed, and then the guide needle 1. The biopsy material is removed from the cavity 14 using mandrel 12.

Example. Patient K., 12 years old, turned to the clinic 04/17/90 g with complaints of the presence of a tumor-like formation on the lateral surface of the neck on the left. From the anamnesis of the disease it was found that the neoplasm was first noticed on 08/03/89. The patient noted a slow growth of the tumor formation without any painful sensations. A child from the group of frequently ill children. For the first time, 20.03.90 g were contacted at the clinic; on 17.04.90, a diagnostic puncture of the neoplasm with the described trocar was performed. Based on the pathological and histological examination of biopsy No. 10481-82 of 04/27/90, the diagnosis was made: chronic hyperplastic lymphadenitis.

Claims (1)

Claim A puncture biopsy trocar comprising a guiding needle with a holder, an internal hollow needle with a hole in the side wall, mounted in the guide with the possibility of fixation, and a mandrin, characterized in that, in order to preserve the morphological structure of the sample by capturing a certain amount of material, the inner needle and the mandrins are made in the form of a harpoon, while the magnitude of the notch of the mandrel corresponds to the magnitude of the working end of the inner needle.