Surgery – Truss – Perineal
Patent
1987-07-28
1988-12-13
Grieb, William H.
Surgery
Truss
Perineal
138120, A61B 100
Patent
active
047902949
ABSTRACT:
A steering section for an endoscope or borescope employs a plurality of steering cables that pass through peripheral bores of axially aligned flat washers. Pairs of beads are strung on the cables between the washers to define hinge points for the bending of the steering section. Each pair of beads include a spherical-nose ball bead and a countersunk socket bead. A through-passage in the ball bead has a relatively narrow nose portion with a small clearance with respect to the steering cable, and a tapered or countersunk portion that expands basewards and prevents the spacer bead from binding the cable. The axial bores in the washers are tapered out fore and aft from a relatively narrow waist portion so that the cable touches the washer only at a single point. Limiter beads of about half the thickness of the spacing between washers limit the bending of the steering section.
REFERENCES:
patent: 3190286 (1965-06-01), Stokes
patent: 3557780 (1971-01-01), Sato
patent: 3583393 (1971-06-01), Takahashi
patent: 3610231 (1971-10-01), Takahashi
patent: 3669098 (1972-06-01), Takahashi
patent: 3739770 (1973-06-01), Mori
patent: 3799151 (1974-03-01), Fukaumi et al.
patent: 4347837 (1982-09-01), Hosono
patent: 4700693 (1987-10-01), Lia et al.
Allred, III Jimmie B.
Bingham Richard
Grieb William H.
Welch Allyn Inc.
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