Acoustic catheter with reduced friction drive

Details Acoustic catheter with reduced friction drive Acoustic catheter with reduced friction drive

1996-05-23

1997-01-14

Buiz, Michael Powell

Surgery

Instruments

Cutting, puncturing or piercing

606171, 606178, 606 1, A61B 1732

Patent

active

055934153

ABSTRACT:
An acoustic catheter (10) has a shaft (18) driven by a rotary motor (60). The shaft drives a rotary-to-axial motion converter (30) near the distal end (14) of the catheter. The converter (30) includes a rotary driver (42) with a wavy or sinusoidal bearing surface (36) facing a similarly wavy face (38) of a follower element (44). As the rotary driver (42) rotates, the follower (44) moves axially with a reciprocating motion. High rotational speeds are required to achieve high acoustic frequencies. The high speeds and high acceleration rate of the follower result in frictional forces which cause undesired heating. The heating effects are reduced by a magnetic bearing arrangement associated with the mating bearing surfaces of the rotary driver and follower, which tends to keep them slightly separated, and thereby reduce friction. Other embodiments use magnets to restore the follower to its proximal position following each excursion, and use magnetic thrust bearings for the rotary driver.

REFERENCES:
patent: 5057119 (1991-10-01), Clark et al.
patent: 5211646 (1993-05-01), Alperovich et al.
patent: 5423797 (1995-06-01), Adrian et al.

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