Patent ID: 8641417

Claim:
A system for sealing a rotating shaft of a motor in a handpiece subject to pressure applied in a first direction during a pressurization cycle of an autoclaving process and subject to pressure applied in a second opposite direction during a vacuum cycle of the autoclaving process, comprising: a rotating shaft coupled to a tool during a medical/dental procedure; a first spring seal positioned at a first location on the rotating shaft, the first spring seal being fixed to a housing of the motor, the first spring seal having a base at a closed end and a pair of sealing lips attached to the base at the closed end, the sealing lips being spaced apart at an open end, the open end of the first spring seal being directed toward a force applied during the pressurization cycle to cause the first spring seal to expand during the pressurization cycle of the autoclaving process to increase a sealing force provided by the first spring seal during the pressurization cycle a second spring seal positioned at a second location on the rotating shaft, the second spring seal being fixed to the housing of the motor, the second spring seal having a base at a closed end and a pair of sealing lips attached to the base at the closed end, the sealing lips being spaced apart at an open end, the open end of the second spring seal being directed toward a force applied during the vacuum cycle to cause the second spring seal to expand during the vacuum cycle of the autoclaving process to increase a sealing force provided by the second spring seal during the vacuum cycle, wherein the sealing lips of the open end of the first spring seal face in an opposing direction from the sealing lips of the open end of the second spring seal, wherein the first spring seal is spaced apart from the second spring seal; an excluder seal mounted on the shaft to block particles produced by the tool from reaching the first spring seal; and an interfacial seal disposed between the rotating shaft of the motor and an electrical connection of the motor to a cable or cable conductors.