Trocar
First Claim
Patent Images
1. A shielded obturator comprising:
- a. an obturator sheath having an inner lumen, a distal end and a proximate end;
b. a handle mounted to the proximate end of said obturator sheath;
c. a pointed blade on the distal end of the obturator sheath;
d. a shield slidably mounted relative to the obturator sheath and having a thickened end portion of diameter greater than the inner lumen of said sheath, an intermediate portion relatively narrower than said thickened end portion and a proximal portion; and
e. a biasing means tending to bias the shield into an extended protective position.
3 Assignments
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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 with an improved sheath mounting and 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 sheath and obturator handle and housing assembly may be fabricated as a single plastic piece.
107 Citations
20 Claims
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1. A shielded obturator comprising:
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a. an obturator sheath having an inner lumen, a distal end and a proximate end; b. a handle mounted to the proximate end of said obturator sheath; c. a pointed blade on the distal end of the obturator sheath; d. a shield slidably mounted relative to the obturator sheath and having a thickened end portion of diameter greater than the inner lumen of said sheath, an intermediate portion relatively narrower than said thickened end portion and a proximal portion; and e. a biasing means tending to bias the shield into an extended protective position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A shielded obturator comprising:
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(a) an obturator sheath having a distal end and a proximal end; (b) a handle on the proximate end of said obturator sheath; (c) a pointed blade on the distal end of the obturator sheath; (d) a shield slidably mounted relative to the obturator sheath and further comprising a forward segment which extends from the distal end of the obturator sheath and an interlocking rear segment which proceeds proximally and is biased in the distal direction. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A trocar comprising a cannula having a cannula tube with an interior lumen and an obturator having:
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(a) an obturator sheath having a distal and a proximate end; (b) a handle mounted to the proximate end of said obturator sheath; (c) a pointed blade at the distal end of the obturator sheath; (d) a shield slidably mounted relative to the obturator sheath; and (e) a biasing means tending to bias the shield distally into an extended protective position; Such that when the obturator is interfitting with the cannula, the distal end of the obturator sheath is entirely contained within the interior lumen of the cannula tube. - View Dependent Claims (18, 19, 20)
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Specification