Negative pressure gun loop ligature apparatus capable of achieving lateral aspiration

The invention provides a negative pressure gun loop ligature apparatus capable of achieving lateral aspiration. The negative pressure gun loop ligature apparatus comprises a piston sleeve assembly, anL-shaped aspiration head assembly, a rubber ring and a stirring rod assembly; the piston sleeve assembly is used for generating relative negative pressure, the L-shaped aspiration head assembly is communicated with the piston sleeve assembly to aspirate a tissue focus, the rubber ring sleeves the L-shaped aspiration head assembly and is used for conducting loop ligature on the tissue focus, and the stirring rod assembly is used for making the rubber ring separated from the L-shaped aspiration head assembly; the L-shaped aspiration head assembly comprises a gas-introduction straight tube whichis parallel to the axis of the piston sleeve assembly and a bend which is communicated with the gas-introduction straight tube and used for accommodating the tissue focus. The portion, on an excitation straight rod, of the ru