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Surgical obturator

  • US 8,105,348 B2
  • Filed: 06/03/2009
  • Issued: 01/31/2012
  • Est. Priority Date: 12/14/2006
  • Status: Expired due to Fees
First Claim
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1. Surgical obturator for piercing a body wall, comprising:

  • a tubular housing,a blade carrier displaceable in the tubular housing in a longitudinal direction between an advanced cutting position and a retracted protected position,a blade with a cutting edge held on the blade carrier, the cutting edge being guided in a correspondingly extending guide of the tubular housing,a protective cap engaging over the blade and being displaceable in the tubular housing in the longitudinal direction between an advanced rest position in which the blade is completely covered in the protected position and a retracted work position, the protective cap having a slit through which the cutting edge of the blade passes and, in the work position of the protective cap, the blade projects through the slit, anda retracting device arranged in the tubular housing and displacing the blade from the cutting position to the protected position, the retracting device being activatable by displacement of the protective cap from the work position to the rest position, the retracting device comprising a switching element which fixes the blade in the cutting position and, upon activation, releases the blade for displacement to the rest position, the switching element being mounted in the tubular housing so as to be freely rotatable about a longitudinal axis of the tubular housing and immovable in the longitudinal direction, and the switching element being rotatable, upon displacement of at least one of the blade carrier and the protective cap in the longitudinal direction, by means of a cam guide which is operative between the switching element, on the one hand, and at least one of the blade carrier and the protective cap, on the other hand;

    wherein;

    the switching element is a sleeve which concentrically surrounds the blade carrier;

    the cam guide operative between the switching element and the blade carrier is formed by cam tracks and cams adapted to abut thereon, the cams and the cam tracks being arranged on an outer side of the blade carrier and on an inner wall of the switching element, respectively; and

    a first cam, upon displacement of the blade carrier from the protected position in the longitudinal direction towards the cutting position, slides along a first section of a corresponding cam track that extends at an incline to the direction of displacement of the blade carrier and thereby rotates the switching element from an initial position in a first direction, and a second cam enters into abutment with a second section of the corresponding cam track extending in an opposite direction at an incline to the direction of displacement of the blade carrier once the first cam has moved past the first section of the cam track, so that the switching element is rotated in an opposite second direction into a blocking position in which, upon subsequent retraction of the blade carrier from an end position located in front of the cutting position, a portion of the blade carrier strikes a portion of the switching element and thereby prevents any further retraction of the blade carrier.

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