Prestressed column

Details Prestressed column Prestressed column

1992-04-20

1993-03-23

Yasko, John D.

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

29447, 138129, A61M 2500

Patent

active

051959917

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 the tube causing the tube to neck down onto the spring. The stretching develops internal stresses which are ultimately imparted to the spring thereby increasing the modulus of the catheter.

REFERENCES:
patent: 4990143 (1991-02-01), Sheridan
patent: 5037404 (1991-08-01), Gold et al.
patent: 5057092 (1991-10-01), Webster, Jr.
patent: 5069674 (1991-12-01), Fearnot et al.

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