Drive shaft for acoustic imaging catheters and flexible catheter

Details Drive shaft for acoustic imaging catheters and flexible catheter Drive shaft for acoustic imaging catheters and flexible catheter

1993-10-29

1995-08-01

Manuel, George

Surgery

Truss

Pad

A61B 812

Patent

active

054372828

ABSTRACT:
A shaft is shown having inner and outer members in interfering contact along their length, at least one of which comprises a wire, at least a portion of which is superelastic, to achieve substantial mechanical fidelity and resistance to damage. An ultrasound imaging catheter has a hollow catheter shaft, an ultrasound transducer in the shaft, and a drive shaft that rotates the transducer. The shaft comprises at least one metal coil having characteristic elastic deformation under stress in the range of about 3% to 9%, while a restraint means prevents torsional deflection of the coil. A drive shaft having a coil surrounded by a tube, a coil bonded to an inner coaxial cable, and an inner and outer coil that interfere with one another are shown. A superelastic coil is formed by continuously winding a wire about a mandrel, heating a region of the wire to render it superelastic, and after cooling, removing it from the mandrel.

REFERENCES:
patent: 4817613 (1989-04-01), Jaraczewski et al.
patent: 4849032 (1989-07-01), Kawaguchi
patent: 4951677 (1990-08-01), Crowley et al.
patent: 5046948 (1991-09-01), Miura
patent: 5221269 (1993-06-01), Miller et al.
patent: 5228441 (1993-07-01), Lundquist
patent: 5348017 (1994-09-01), Thornton et al.
patent: 5368049 (1994-11-01), Raman et al.

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