Medical apparatus

摘要

Liquid is ejected in a pulse-like manner from a nozzle provided at the distal end of a liquid ejection pipe. When the liquid is ejected, moving speed of the nozzle is detected. A driving frequency of a piezoelectric element is increased when the moving speed increase. The driving frequency is reduced when the moving speed decreases. Consequently, it is possible to prevent the number of times the liquid is ejected per unit length from changing according to the moving speed of the nozzle. Therefore, it is possible to excise a biological tissue at stable excision depth.

主权项

1. A medical apparatus that ejects liquid from a nozzle provided at a distal end of a liquid ejection pipe, the medical apparatus comprising:
a pulsation generating unit configured to change a capacity of a liquid chamber connected to the liquid ejection pipe according to displacement of a piezoelectric element and generate pulsation in the liquid; a liquid supplying unit configured to supply the liquid to the liquid chamber; a moving-speed detecting unit configured to detect the moving speed of the nozzle with respect to a liquid ejection target which is external to the nozzle; and a pulsation-generation control unit which controls the pulsation and which is configured to increase a driving frequency of the piezoelectric element as the detected moving speed of the nozzle increases from a first detected moving speed to a second detected moving speed.