Smoothened coil spring wire guide
US3973556A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 20, 1975 |
| Grant date | Aug 10, 1976 |
| Priority date | — |
| Expiry date | Jun 20, 1995 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2025/09091
- WIPO fieldMedical technology
- WIPO sectorInstruments
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 …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.