PROBLEM TO BE SOLVED: To provide a technique for a medical liquid injection device.SOLUTION: A medical liquid injection device comprises: a liquid injection scalpel that injects liquid； an ultrasonic scalpel that generates ultrasonic waves； an interior body that houses the liquid injection scalpel and the ultrasonic scalpel and includes a first opening part from which a tip part of the liquid injection scalpel or a tip part of the ultrasonic scalpel can be protruded； an exterior body that houses the interior body and includes a second opening part at a position corresponding to the first opening part； a suction path that consists of a space formed between the interior body and the exterior case； and an operation part that is arranged in the exterior body and selectively protrudes the tip part of the liquid injection scalpel or the tip part of the ultrasonic scalpel from the first opening part.【課題】医療用液体噴射装置に関する技術を提供する。【解決手段】医療用液体噴射装置であって、液体を噴射する液体噴射メスと、超音波を発生する超音波メスと、液体噴射メスと超音波メスとを収容し、液体噴射メスの先端部または超音波メスの先端部を突出可能な第１の開口部を有する内装体と、内装体を収容し、第１の開口部に対応した位置に第２の開口部を有する外装体と、内装体と外装体との間に形成される空隙からなる吸引経路と、外装体に配置され、液体噴射メスの先端部または超音波メスの先端部を選択的に第１の開口部から突出させるための操作部とを備える。【選択図】図３
