Surgery – Truss – Perineal
Patent
1975-06-20
1976-08-10
Howell, Kyle L.
Surgery
Truss
Perineal
128 205R, 128DIG9, 128348, 267180, A61M 2500
Patent
active
039735567
ABSTRACT:
A coil spring guide, for use in connection with the insertion of a catheter into the vessels of a body, that has a coil spring, and a wire core extending within the coil spring and having a distal end welded to the distal end of the coil spring. The coil spring is made from metal wire that in a straightened condition is circular in transverse cross section throughout its length, and that after being coiled, to have adjacent helics abut against one another. Thereafter the radially outer circumferential portion of the coil is ground away to provide a helical radially outer spring coil surface (chordal surface) that is of a substantially constant radius throughout the axial length of the coiled wire and has a helix width of a chord parallel to the central longitudinal axis of the coil spring that is subtended by about a 10.degree.-140.degree. angle of two radii of the coil spring wire. Advantageously, prior to carrying out a material removal step on the coil spring to provide the helical chordal surface, the surface of the coil spring radially outwardly of the coil helics in abutting relationship is coated with a plastic material and the plastic coating is removed during the material removal except for any part of the coating that does not extend further radially outward of the coil spring central axis than the chordal surface; or alternately the coil spring may be coated with the plastic coating after the material removal step to provide a coating covering the helical chordal surface.
REFERENCES:
patent: 2118631 (1938-05-01), Wappler
patent: 2622448 (1952-12-01), Lorig
patent: 3452742 (1969-07-01), Muller
patent: 3521620 (1970-07-01), Cook
patent: 3528406 (1970-09-01), Jeckel et al.
patent: 3547103 (1970-12-01), Cook
patent: 3727902 (1973-04-01), Burckhardt et al.
patent: 3841308 (1974-10-01), Tate
Fleischhacker John J.
Fleischhacker, Jr. Joseph F.
Howell Kyle L.
Lake Region Manufacturing Company, Inc.
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