Surgical hair clippers and vacuum apparatuses including sensing and feedback devices

A vacuum apparatus for collecting cut hair comprising:

• a housing;
• a motor located in the housing;
• a fan operatively connected to the motor for producing a negative pressure within a filter assembly;
• the filter assembly comprising a filter housing and a filter located in the filter housing, the filter configured to move away from an end of the filter housing and increase a storage volume for cut hair within the filter housing;
• a first position sensor located in the filter housing that is configured to detect the filter;
• a second position sensor located in the filter housing that is configured to detect the filter, wherein the first position sensor is positioned closer to the end of the filter housing than the second position sensor;
• a third position sensor located in the filter housing that is configured to detect the filter, wherein the first position sensor and the second position sensor are positioned closer to the end of the filter housing than the third position sensor;
• and
• a processor that receives signals from the first position sensor, the second position sensor and the third position sensor when each of the first position sensor, the second position sensor and the third position sensor detects presence of the filter and the processor uses logic saved in a memory to instruct the motor to increase or decrease speed of the motor based on which of the first position sensor, the second position sensor and the third position sensor provides the signal.