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Power-assisted liposuction instrument and cannula assembly therefor

  • US 5,643,198 A
  • Filed: 09/16/1994
  • Issued: 07/01/1997
  • Est. Priority Date: 12/14/1990
  • Status: Expired due to Term
First Claim
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1. A powered liposuction device comprising:

  • (A) a hand-holdable housing having a longitudinal extent, a cylindrically-shaped cannula cavity extending along a substantial portion of said longitudinal extent, and a reciprocation means reciprocatable within said hand-holdable housing and being operated associated within an actuation means; and

    (B) a cannula assembly operably connectable to said hand-holdable housing, and including;

    (1) a hollow inner cannula having a distal end, and proximal end, and at least one inner suction aperture about said inner cannula distal end, said inner cannula proximal end further including an outlet port and a continuous passageway communicating said inner suction aperture with said outlet port, said inner cannula having an inner cannula base portion extending from said inner cannula proximal end and being releasably connectable to said hand-holding housing;

    (2) a hollow outer cannula having a distal end, a proximal end, and at least one outer elongated suction aperture disposed about said outer cannula distal end, said outer cannula having an outer cannula base extending from said outer cannula proximal end and having a cylindrically shaped portion being releasibly received within said cylindrically-shaped cannula cavity, and said cylindrically-shaped portion having a notch means for releasibly engaging said actuation means, and said hollow inner cannula being disposed within at least a portion of said hollow outer cannula so as to enable sliding movement between said hollow outer and inner cannulas while permitting aspiration through said outer and inner suction apertures, along said continuous passageway and out of said outlet port,(3) alignment means, operably associated with said hollow inner cannula, for aligning said hollow inner and outer cannulas so that said inner suction aperture is in registration with at least a portion of said outer elongated suction aperture as said hollow inner and outer cannulas are caused to undergo said sliding movement, and(4) said hollow inner cannula being operably associated with said actuation means, and said hollow outer cannula being supportable in an essentially stationary position with respect to said hand-holdable housing so that said actuation means can effectuate relative sliding movement between said hollow inner and outer cannulas when said reciprocation means reciprocates, and that the location of said aspiration is periodically displaceable a distance equal to a substantial portion of the longitudinal extent of said hand-holding housing.

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