DD287650A5 - BIOPSIEKANUELE - Google Patents

Abstract

The invention relates to a biopsy cannula. According to the invention, the operative end of the cane is shaped in the form of at least one point, one leg of which is rectilinear or arcuate, and whose other leg spirals from the point to the point of intersection with the other leg in the cylinder jacket wall. Both legs are provided with an inwardly extending cut from auszen. The cutting edge is laid to the inner circumference of the canoe. With a plug-in stylet, the biopsy cannula forms a biopsy needle. On the one hand, the needle can be designed with such a small diameter that larger tissue lesions with subsequent haemantons can be avoided, but on the other hand histologically evaluable tissue samples can be taken without substantial cell destruction or traumatization of the tissue. (Fig. 1) {biopsy cannula; Top; Cutting edge; Schneidflaeche; Cut; Cylindrical shell wall; Stiletto}

Description

-2- 287 650 Explanation of the essence of the invention

The object of the invention is to propose a biopsy cannula with a bevel suitable for obtaining histologically acceptable tissue samples. According to the invention the object is achieved in that the effective end of the cannula in the form of at least; is designed a tip whose one. · Sch arc is rectilinear or arcuate and whose other leg spirally from the top to the intersection with the other leg in the cylinder jacket wall. Both legs are provided with an outwardly inwardly extending cut so that the cutting edge is laid to the inner circumference of the cannula, üie formed Schneidflächon close to the tangent of the inner edge of the cannula at an acute angle, preferably from 20 to 60 Grs d. The biopsy cannula according to the invention has a cylinder jacket wall which encloses an axial cavity. With a plug-in stylet, the biopsy cannula forms a biopsy needle. The stylet protrudes at the front end and is sharpened pyramid-like. The needle unit is inserted through the skin of the patient into the tissue region of interest, preferably under visual control. Then the stylet is removed and the cannula is connected to a syringe to achieve a slight negative pressure. With slight rotation, the cannula is then advanced, so that a thin tissue cylinder passes through the negative pressure or the feed into the cannula. It is possible to take histologically evaluable tissue samples without substantial cell disruption or traumatization of the biopsied tissue. All parenchymatous organs and their changes, soiide tumors and cysts, can be punctured. In case of a histological clarification, a targeted diagnosis and therapy is necessary. The patient is given the least amount of pain.

embodiment

The invention is explained in more detail below with reference to two examples. Show

1 and 3: the end of the biopsy needle according to the invention in side view and Fig. 2 and 4: the plan view in a section along the line A-A.

example 1

The effective cannula end is in the form of a tip 1. The two legs 3 of the recess 2 meet on the one hand in the top 1 and the other in the Zylindermantolwand 7 at the intersection 9. The one leg is 3 rectilinear, the other is spirally extending from the top 1. Both legs are with a from the outside provided inwardly extending cut, so that the cutting edge 4 is laid to the inner periphery of the edge. The formed snow surfaces 5 subtend an angle of .30 degrees to the tangent to the inner edge of the cannula 6. This creates a cutting «. The cannula has a cylinder jacket wall 7 which surrounds an axial cavity 8.

The biopsy cannula according to the invention together with a plug-in stylet forms a biopsy needle. The stylet protrudes at the front end of the cannula and is sharpened.

Example 2

The Ausi'ührungsform shown differs from the Ausführungsforri in Example 1, characterized in that it goradli .ige leg 3 is arcuate. The further form corresponds to that shown in Example 1.

Claims (2)

1. biopsy cannula, consisting of a cylinder jacket wall surrounding an axial cavity, characterized in that the effective end of the cannula is designed in the form of at least one tip, wherein in each case one leg is rectilinear or arcuate and the respective other leg spirally from the respective tip extends to the intersection with the other leg in the cylinder jacket wall and the ground edge of the edges runs from the outside to the inside, so that at least two cutting surfaces are formed, which form an acute angle to the tangent to the inner edge of the cannula. 2. biopsy cannula according to claim 1, characterized in that the cutting surfaces to the tangent to the inner edge of the cannula form an angle of preferably 20 ° to 60 °. For this 1 page drawings Field of application of the invention The invention relates to a biopsy cannula for obtaining histologically evaluable tissue samples from biological organs, the diameter of which is selected such that, on the one hand, larger tissue lesions are avoided and, on the other hand, destruction of the tissue cells obtained is largely ruled out. The biopsy cannula is preferably applied under visual control (ultrasound B-BiId), but can also be used for blind punctures. The cannula is hewn in its diameter and in its length so that a puncture can take place at any depth and on any organs. Characteristic of the known state of the art It is known to use for biopsy biopsy a biopsy needle, which looks from a biopsy cannula and a stylet. The stylet has a longer notch in the area of its front end, with the stiletto end being chamfered. The cannula also has a tapered end with a rounded edge. In a biopsy, the biopsy needle is inserted into or in the tissue to be biopsied. Then the notch is released by withdrawal of the cannula or advancement of the stylet so that tissue can penetrate into the approved probein notch from the side. By advancing the cannula, the tissue is cut off. Due to dor notch in the stylet, the total diameter of the needle and thus of the stylet must be relatively large and is in the range of 2mm. This leads to significant lesions in the biopsied tissue, hematoma and pain for the patient. In another biopsy needle, the Naael has a sharpened stylet and a biopsy needle with oblique cut surfaces corresponding to the shape of the stylet. This Chiba needle is for Menghini Suction Biopsy. After inserting the needle, the stylet is removed and tissue is sucked into the needle with a suction syringe. The needle can be made thin (diameter 1 mm), however, then more or less only accidentally whole cells are absorbed. The danger of cell destruction is relatively high. In another biopsy cannula, according to DE-OS3341117, the cannula at its front end effective an internal grinding, so that a cutting edge is formed, such that by grinding the inner wall of the needle, a cutting edge is laid far to the outer periphery and in that the inside edge of the cutting edge extends tangentially away from the inside surface of the cylinder jacket wall. As a result, a cutting edge is formed in the region of the outer periphery. The cutting edge limits the side recesses of the opposite boundary surface of the cylinder jacket wall, which can run parallel to the ground cutting edge. The cannula is inserted into the tissue with a sharpened stiletto, then the stylet is pulled, a suction syringe is placed on the cannula and a slight negative pressure is created. Upon rotation, the cannula is pushed slightly forward, so that tissue is cut out helically from the organ to be biopsied. Here, the cannula can be chosen low with their diameter, so that a low complication rate and patient nuisance is pushed. The case of the latter cannula cylindrical or only slightly oblique grinding difficult to penetrate and guide the needle, especially in hard, solid tissue, as well as the excision of a cylinder of such tissue, so that in these cases can not be recovered with sufficient certainty histologically useful material , As a further disadvantage, a certain traumatization of the tissue due to the nature of the bevel is not always avoidable. Object of the invention The aim of the invention is to take histologically evaluable tissue samples from biological organs using a suitable biopsy cannula, thereby avoiding larger tissue lesions and to largely exclude damage to the cells obtained, whereby the risk for the patient and his nuisance through the puncture procedure should be minimal Needles with a diameter of conventional fine needles or moderately thicker but flexible needles should be used.