Patent ID: 7914482
Filing Date: 2011-03-29
Classification: A61F,A61M

Abstract:
1. A surgical aspiration system comprising: a surgical instrument that includes a distal tip; a vacuum pump a first fluid path coupled to the surgical instrument; a filter attached to the first fluid path; a flow restrictor coupled to the filter, the flow restrictor comprising an orifice defining a fixed orifice inner diameter in the range 0.005 to 0.025 inches and a fixed orifice length in the range 1 to 2 inches, the filter being disposed upstream of the flow restrictor; a second fluid path coupled to the vacuum pump, the second fluid path connected to the flow restrictor and disposed downstream of the flow restrictor, the second fluid path defining a path internal pressure; a pressure sensor capable of sensing the path internal pressure; a switch capable of interrupting operation of the vacuum pump in response to the output of the pressure sensor; a third fluid path coupled to the filter and connected to the second fluid path, bypassing the flow restrictor; and a discrete automated valve in the third fluid path that is responsive to an output of the pressure sensor and that obstructs flow in the third fluid path in response to the path internal pressure.