Shielded trocar and trocar shield
First Claim
Patent Images
1. A shielded obturator comprising:
- (a) an obturator having a distal end and a proximal end, the proximal end of said obturator forming a handle;
(b) a pointed blade on the distal end of the obturator, said pointed blade having a sharpened point at a distal end and sharpened lateral portions;
(c) a shield slidably mounted on the obturator and movable relative to the pointed blade between an extended protective position, a partially retracted semi-protective position covering the sharpened point of the pointed blade, while leaving at least a portion of the sharpened lateral portions exposed for cutting tissue and a retracted unprotected position; and
(d) biasing means tending to bias the shield into the extended protective position.
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Accused Products
Abstract
A trocar is formed from a cannula and an interfitting obturator for penetrating body cavity walls in laparoscopic and endoscopic surgery. The obturator is provided with an improved piercing tip having a pointed blade and an improved double locking blunt nosed shield design. Hydrophilic coatings or components are also employed on the shield and cannula to facilitate quicker shield action covering the pointed blade and ease of entry of the cannula tube through the body cavity wall. The improved shielded trocar is provided with an improved shield having a dolphin-nose shape at its distal end.
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Citations
22 Claims
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1. A shielded obturator comprising:
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(a) an obturator having a distal end and a proximal end, the proximal end of said obturator forming a handle; (b) a pointed blade on the distal end of the obturator, said pointed blade having a sharpened point at a distal end and sharpened lateral portions; (c) a shield slidably mounted on the obturator and movable relative to the pointed blade between an extended protective position, a partially retracted semi-protective position covering the sharpened point of the pointed blade, while leaving at least a portion of the sharpened lateral portions exposed for cutting tissue and a retracted unprotected position; and (d) biasing means tending to bias the shield into the extended protective position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A trocar comprising:
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(a) a cannula with a housing and a cannula tube, the canula tube having a lumen of sufficient diameter to receive an obturator; (b) a shielded obturator having a proximal end forming a handle and also having a distal end to which a pointed blade is mounted;
the pointed blade including a sharpened point and sharpened lateral portions, and said pointed blade being received within the lumen of the cannula tube;(c) a shield slidably mounted on the obturator and moveable relative to the pointed blade between an extended protective position, a partially extended semi-protective position covering the point while leaving at least a portion of the sharpened lateral portions exposed for cutting tissue and a retracted unprotected position; and (d) a biasing means tending to bias the shield into the extended protective position. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of using a trocar to penetrate a body wall comprising the steps of:
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i) providing a trocar having; (a) a cannula with a housing and a cannula tube containing a lumen of sufficient diameter to receive an obturator; (b) a shielded obturator having a proximal end forming a handle and also having a distal end to which a pointed blade is mounted;
the pointed blade including a sharpened point and sharpened lateral portions, and said pointed blade being received within the lumen of the cannula tube;(c) a shield slidably mounted on the obturator and moveable relative to the pointed blade between an extended protective position, a partially extended semi-protective position covering the point while leaving at least a portion of the sharpened lateral portions exposed for cutting tissue and a retracted unprotected position; and (d) a biasing means tending to bias the shield into said extended position at least partially covering the pointed blade; (e) a latch means having at least two locked positions in which the shield is locked in either the extended position or the partially extended semi-protective position, and having an actuated position which permits the shield to be forced into its retracted position; ii) actuating said latch means; iii) urging said cannula tube and pointed blade against the body wall to be penetrated, whereby said shield is pushed into said partially extended semi-protective position by the body wall to expose said pointed blade to penetrate the body wall and said latch means is biased to automatically resume a locking position upon return of the shield to either said partially extended semi-protective position or said extended protective position; iv) urging said cannula tube and pointed blade against the body wall until the sharpened tip penetrates the body wall and the shield locks in the partially extended semi-protective position; v) urging said cannula tube and pointed blade against the body wall until the pointed blade has completely penetrated the body wall and the shield locks in the extended protective position; vi) urging said cannula tube against the body wall until the lumen of the cannula tube communicates through the body wall.
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21. An obturator having:
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a proximal end forming a handle, and a distal end; a pointed blade at the distal end of the obturator; and a shield slidably mounted to the obturator and biased to slide toward the distal end of the obturator and thereby cover the pointed blade with a blade covering portion of said shield; wherein, said blade covering portion of the shield has a dolphin nose shape. - View Dependent Claims (22)
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Specification