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Radial Expansible Retractor For Minimally Invasive Surgery

  • US 20080319268A1
  • Filed: 10/30/2006
  • Published: 12/25/2008
  • Est. Priority Date: 12/15/2005
  • Status: Active Grant
First Claim
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1. A radial expansible retractor for minimally invasive surgery for opening a channel in the brain and in any other soft tissue of a patient, by inserting part of the radial expansible retractor into the body of the patient, and by widening the channel at a continuous and gentle rate, the radial expansible retractor comprising:

  • (a) a grooved disc having a central perforation, a cylindrical surface at the circumference of said grooved disc, and at least three grooves wherein said grooved disc defines an imaginary orthogonal coordinate system having X, Y, and Z axis, wherein said Z axis substantially passes through the center of said central perforation of said grooved disc, and wherein said grooved disc substantially lays on an imaginary plane, perpendicularly to said Z axis, wherein each of said grooves have an continuous curved shape on a plane perpendicular to said Z axis, wherein each of said grooves has three dimensional geometrical shape and size;

    (b) a channeled disc disposed at a position relative to said grooved disc, having at least three channels, wherein said channeled disc substantially lays on an imaginary plane, perpendicularly to said Z axis, and wherein said Z axis substantially passes through the center of said central perforation of said channeled disc, wherein each of said channels has three dimensional geometrical shape and size, wherein each of said channels has a direction on a plane perpendicular to said Z axis, along a radial, wherein said radial starts at said Z axis, wherein said grooved disc can rotate at certain angle limits around said Z axis and thereby changing said position of said channeled disc relative to said grooved disc;

    (c) at least tree ribs defining a channel having a cross sectional size, wherein each of said ribs has a base, a leading edge, and a cross section shape, wherein each of said ribs is laid substantially in parallel to said Z axis; and

    (d) at least three carriers wherein each of said carriers is connected to said base of one of said ribs, so that each of said ribs is connected to one of said carriers, wherein each of said carriers has three dimensional geometrical shape and size, conforming to said geometrical shape and size of said channels, wherein each of said carriers includes;

    (i) a pin having three dimensional geometrical shape and size, conforming to said geometrical shape and size of said grooves, wherein each of said carriers is located inside one of said channels, and wherein each of said pins is located inside one of said grooves, so that a change of a relative position of said channeled disc relative to said grooved disc, which is expressed in a change of the angle between them on the plane perpendicular to said Z axis, causes a change of distance of each of said ribs from said Z axis, while said change of distance can be performed gently and continuously.

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