JPS646915U

JPS646915U -

Info

Publication number: JPS646915U
Application number: JP10096287U
Authority: JP
Priority date: 1987-07-02
Filing date: 1987-07-02
Publication date: 1989-01-17

Description

[Brief explanation of the drawing]

第１図は本考案による生検針の側面図、第２図
はその一部の拡大断面図、第３図は第２図の―
線断面図、第４図は内針の先端部側面図、第５
図は一部を截除した外針の先端部側面図、第６図
は従来例における外針と内針の各先端部側面図、
第７図Ａ乃至Ｅは本考案による作用説明図、第８
図は従来例による作用説明図である。１……外針、２……内針、５……外針先端、５
ａ……二又部で形成される凹入谷部、５ｂ……外
針の先端刃縁、６……内針の尖鋭先端部、７……
原形の円形断面部、８……内針の異径断面部、８
′……空隙、９……凹溝。 Fig. 1 is a side view of the biopsy needle according to the present invention, Fig. 2 is an enlarged sectional view of a part thereof, and Fig. 3 is the same as that shown in Fig. 2.
Line sectional view, Figure 4 is a side view of the tip of the inner needle, Figure 5 is a side view of the tip of the inner needle.
The figure is a side view of the distal end of the outer needle with a portion cut away, and FIG. 6 is a side view of the distal ends of the outer needle and inner needle in the conventional example.
7A to 7E are action explanatory diagrams according to the present invention;
The figure is an explanatory diagram of the operation according to a conventional example. 1... Outer needle, 2... Inner needle, 5... Outer needle tip, 5
a...Concave valley formed by the forked part, 5b...Tip edge of the outer needle, 6...Sharp tip of the inner needle, 7...
Original circular cross section, 8...Different diameter cross section of inner needle, 8
'...Gap, 9...Concave groove.

Claims

[Scope of utility model registration request]

It consists of a syringe equipped with an outer needle with a cutting edge formed at the tip, and a piston rod equipped with an inner needle with a sharp tip and a different diameter cross section from the bottom to the base. The piston rod is inserted into the syringe in a removable manner, and the piston rod is retracted with the outer needle inserted into the living tissue to be removed.The negative pressure inside the syringe is used to remove the living tissue. In this device, the tip of the outer needle is made into a forked shape, and the edge is formed into a blade edge that is cut inward from the outside of the tip. A biopsy needle comprising a groove formed on the outer periphery of the inner needle extending from the upper end of the gap between the needle and the inner wall of the outer needle to the base of the sharp tip.