Method for making prestressed column

Details Method for making prestressed column Method for making prestressed column

1991-01-18

1992-06-16

Eley, Timothy V.

Metal working

Method of mechanical manufacture

Assembling or joining

29448, 29450, 29508, 29517, B21D 3900, B23P 1100

Patent

active

051215365

ABSTRACT:
A catheter includes a spring having a plurality of convolutions disposed along a longitudinal axis, and a first modulus. A sheath overlying the spring engages the convolutions of the spring and imparts to the spring axial compressive stresses which increase the modulus of the spring. The catheter can be manufactured by inserting the spring into a tube of Hytrel.RTM. material, stretching the tube at a transition region which advances along thhe tube causing the tube to neck down onto the spring. The stretching develops internal stresses which are utimately imparted to the spring thereby increasing the modulus of the catheter.

REFERENCES:
patent: 2641302 (1953-06-01), Martin
patent: 2766806 (1954-08-01), Rothermel
patent: 2783819 (1957-03-01), Duff
patent: 2797730 (1957-07-01), Martin
patent: 3290196 (1966-12-01), Duff
patent: 3779846 (1973-12-01), Kleykamp
patent: 3811178 (1974-05-01), Tarnavsky et al.
patent: 3982982 (1976-09-01), Chudgar
patent: 4477147 (1984-10-01), Winter et al.

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