Surgery – Instruments – Cutting – puncturing or piercing
Patent
1995-01-26
1997-04-29
Buiz, Michael Powell
Surgery
Instruments
Cutting, puncturing or piercing
604164, A61B 1734
Patent
active
056244592
ABSTRACT:
A surgical trocar has three integral single beveled blades having cutting edges which, when viewed head on, resemble a Y configuration. The distal end of each blade is formed with a leading cutting edge and a single trailing edge which define a single beveled face. The blades are arranged so that their leading edges converge to form a sharp point at the distal end of the trocar with the leading cutting edges extending proximally and radially from the point. The trocar is preferably extruded with three fins which are shifted relative to the longitudinal axis of the extrusion such that at most a first side of each fin lies along a ray from the longitudinal axis of the extrusion. Alternatively, both sides are shifted to one side of the longitudinal axis. The distal end of each fin is then ground to form a single bevel with at least a portion of the cutting edge of the beveled fin lying in a plane which includes the longitudinal axis of the extrusion and being angled proximally. The fins are preferably spaced at 120.degree. intervals from one another about the longitudinal axis of the extrusion. The extrusion is preferably stepped proximal of the cutting edges to form a descending step for stopping the distal movement of a spring biased safety shield. The fins may be ground using the same machine used to grind a pyramidal trocar tip and will result in cutting edges with half the angle of the cutting edges of the pyramidal tip.
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"New instruments for penetrating the abdominal wall. An engineering approach." by Hoskin, Manually Invasive Therapy, 1993 pp. 109-111.
Erwin Philip O.
Kortenbach Juergen A.
Buiz Michael Powell
Gordon David P.
Lewis William
Symbiosis Corporation
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