A blockage-proof-type negative pressure suction apparatus comprising a suction tube (1), a negative pressure source (2), and a tube core (3). A flow channel (11) is formed at the middle of the suction tube (1) along the length thereof. The two ends of the flow channel (11) are trumpet-shaped openings, and the small end thereof is connected to the negative pressure source (2). The tube core (3) is arranged within the flow channel (11) of the suction tube (1). The external contour of the tube core (3) is step-shaped. Another flow channel (31) is formed in the middle of the tube core (3). The top end of the other flow channel (31) is sealed, while the bottom end is configured as an opening for connection to the negative pressure source (2). The sidewall of the upper end of the tube core (3) has formed at least one liquid permeation hole (32) in communication with the other flow channel (31). The inner wall of the suction tube (1) or the outer wall of the tube core (3) is provided with a spiral protrusion. Utilization of the spiral protrusion allows a sucked object to rotate along the flow channels, and large chunks of tissue materials and blood clots are removed along the flow channel (11), while effusions can be divergently removed along the other flow channel (31) of the tube core (3).La présente invention concerne un appareil daspiration par pression négative de type anti-blocage comprenant un tube daspiration (1), une source de pression négative (2), et une âme de tube (3). Un canal découlement (11) est formé au milieu du tube daspiration (1) le long de sa longueur. Les deux extrémités du canal découlement (11) sont des ouvertures de la forme dune trompette, et sa petite extrémité est reliée à la source (2) de pression négative. Lâme de tube (3) est disposée à lintérieur du canal découlement (11) du tube daspiration (1). Le contour externe de lâme de tube (3) est de forme étagée. Un autre canal découlement (31) est formé au milieu de lâme de tube (3). Lextrémité su
