Liquid cooled, powered surgical handpiece

A powered micro-cutting instrument assembly comprising:

• a micro-cutting instrument;
• and
• a handpiece configured to be selectively coupled to the micro-cutting instrument, the handpiece comprising:
• a sleeve defining a handling region and forming an inlet port and an outlet port proximal the handling region,
• a motor enclosure maintained within the sleeve, the motor enclosure defining an intermediate section,
• an internal passage formed entirely between the sleeve and the motor enclosure, wherein the inlet port and the outlet port are fluidly connected to the internal passage, and
• a motor maintained within the motor enclosure, the motor being configured to provide mechanical power to the micro-cutting instrument,
• wherein the internal passage and the motor are similarly located along the intermediate section;
• and
• a cooling fluid circulated through the internal passage from the inlet port to the outlet port;
• wherein such circulation reduces the heat transfer from the motor to the sleeve.

A method of cooling a powered surgical handpiece configured for use with a micro-cutting instrument, the method comprising:

• providing the handpiece comprising:
• a housing forming an internal passage entirely between a sleeve and a motor enclosure, wherein the sleeve forms an inlet port and an outlet port, each port being fluidly connected to the internal passage, and
• a motor maintained within the motor enclosure, wherein the motor and the internal passage are similarly located along the motor enclosure;
• and
• providing a fluid source;
• fluidly connecting the fluid source to the inlet port;
• providing a retention reservoir configured to collect a cooling fluid;
• fluidly connecting the outlet port to the retention reservoir;
• coupling the handpiece to a surgical micro-cutting instrument;
• operating the micro-cutting instrument in a surgical area by powering the handpiece;
• operating the fluid source to continuously circulate cooling fluid through the inlet port directly to the internal passage and subsequently through the outlet port to the retention reservoir while not discharging fluid to the surgical area, wherein heat generated by the motor is transferred through the motor enclosure to the cooling fluid to reduce heat transfer to the sleeve.