Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1992-06-25
1994-08-16
Rosenbaum, C. Fred
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
606185, A61M 5178
Patent
active
053383052
ABSTRACT:
A trocar for placement in the lumen of a cannula to facilitate inserting the cannula through the wall of a body cavity, the trocar comprising an obturator with a point for piercing the wall of the body cavity, and a protective sleeve mounted concentrically around the obturator. The obturator retracts proximally relative to the protective sleeve after the trocar point has penetrated through the wall of the body cavity. The protective sleeve is mounted for axial movement relative to the obturator, retracting proximally in response to drag from the wall of the body cavity as the trocar is advanced through the wall, and advancing distally after the cannula has penetrated through the wall, reducing the drag on the sleeve. The distal advancement of the sleeve triggers the retraction of the obturator.
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Barker John M.
Plyley Alan K.
Redmond Russell J.
Vidal Claude
Griswold Gary L.
Hohenshell Jeffrey J.
Kirn Walter N.
Mendez Manuel
Minnesota Mining and Manufacturing Company
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