Biopsy needle having three usage modes

A biopsy needle, comprising an upper cover, a base, an inner needle assembly, and an outer needle assembly, wherein the inner needle assembly comprises an inner needle holder and an inner needle fixedly installed on the inner needle holder, the outer needle assembly comprises an outer needle holder and an outer needle fixedly installed on the outer needle holder, the inner needle holder and the outer needle holder are respectively installed in the upper cover and the base that are combined with each other in a reciprocating sliding and elastic loading manner in a needle insertion direction, and the inner needle and the outer needle extend from front end in the needle insertion direction of the upper cover and the base, and the inner needle is inserted into the outer needle, characterized in that the biopsy needle further comprises a loading assembly, a first rear emission assembly, a second rear emission assembly, a first side emission assembly and a second side emission assembly, wherein:

• the loading assembly is slidably set on the upper cover back and forth in a direction parallel to the needle insertion direction, and a first loading matching structure is provided for the loading assembly and the outer needle holder respectively, by which the outer needle holder is driven to be elastically loaded in place when the loading assembly slides backward, and a second loading matching structure is provided for the loading assembly and the inner needle holder respectively, by which a cooperation is achieved after the outer needle holder is loaded in place to drive the inner needle holder to be elastically loaded in place with the loading assembly sliding backward;
• the first rear emission assembly and the second rear emission assembly are respectively installed at rear end in the needle insertion direction in the upper cover and the base combined with each other, and the first rear emission assembly has a first rear emission button which acts on the inner needle holder to release a loading state of the inner needle holder and emit the inner needle holder, and the second rear emission assembly has a second rear emission button which acts on the outer needle holder to release a loading state of the outer needle holder and emit the outer needle holder, and acts on the inner needle holder to release the loading state of the inner needle holder and emit the inner needle holder when the inner needle holder has not been emitted;
• and
• the first side emission assembly and the second side emission assembly are respectively installed on one side in the needle insertion direction in the upper cover and the base combined with each other, and the first side emission assembly has a first side emission button which acts on the inner needle holder to release the loading state of the inner needle holder and emit the inner needle holder, and the second side emission assembly has a second side emission button which acts on the outer needle holder to release the loading state of the outer needle holder and emit the outer needle holder, and acts on the inner needle holder to release the loading state of the inner needle holder and emit the inner needle holder when the inner needle holder has not been emitted.