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US 5,849,017 AGranted
Moulded plastic obstetric forceps
AssigneeThe University of Western Ontario Stevenson-Lawson Building
InventorsJ. Lawrence Reynolds, Paul M. Kurowski
Life of this patent
Estimating the term…
Abstract
Obstetric forceps have a pair of elongated members, each having a blade at one end, a handle at an opposite end and a shank connecting the blade and handle. The members pivotally engage each other at a pivot point intermediate their ends and freely moveable when so engaged. The blades and shanks of each of the members are resiliently constructed to exert a traction force within a preset margin of safety and to slip when the preset margin of safety is exceeded.
Claims8
Obstetric forceps comprising:
- a pair of elongate members, each of which has a blade at one end, a handle at an opposite end and a shank connecting said blade and handle, said members pivotally engaging each other at a pivot point intermediate their ends, each said blade having a blade tip distal said handle and said members being sized and constructed of a resilient material such that resilient deflection of the blade tip relative to the pivot point occurs when a pressure load is applied to said blades as they are closed on a head of a baby, said deflection being in the range of from about 0.3 mm/N to about 0.9 mm/N to allow the blades to slip off said head of a baby during traction thereof if said pressure load exceeds a preset margin of safety.
Dependencies are inferred from the claim text.