Surgery – Instruments
Patent
1994-04-25
1995-06-13
Aschenbrenner, Peter A.
Surgery
Instruments
604 22, A61B 1700
Patent
active
054237971
ABSTRACT:
An acoustic catheter reduces transmission losses and unwanted heating of the transmission member by driving the catheter a rotary motor. The catheter includes an elongated body and a shaft extending longitudinally therethrough. The shaft is adapted for coupling to a rotary motor. A rotary-to-axial motion converter is coupled to the shaft at distal end of the catheter, for converting rotary shaft motion into axial acoustic motion. In one embodiment, the rotary-to-axial motion converter includes a swash plate driven by the shaft. The swash plate defines a surface which, at an angularly fixed reference point, moves axially in response to the rotary motion of the swash plate. A follower bears on the swash plate, for moving axially in response to axial motion of the follower. The follower includes a projection bearing on the swash plate and a spring urging the follower toward the swash plate. In one embodiment, the swash plate has a sinusoidal surface, while another embodiment has notches cut into the surface. The follower generates acoustic energy within a fluid medium, and may have a concave fluid coupling surface. To aspirate the material removed from arterial walls, one or more lumens extend through the catheter. In a particular embodiment of the invention, the rotary shaft is hollow, in order to allow a guide wire to pass therethrough.
REFERENCES:
patent: 3433226 (1969-03-01), Boyd
patent: 5156143 (1992-10-01), Bocquet et al.
patent: 5211646 (1993-05-01), Alperovich et al.
patent: 5243992 (1993-09-01), Uflacker et al.
patent: 5305731 (1994-04-01), Bucholtz
patent: 5326342 (1994-07-01), Pflueger et al.
Adrian Sorin
Hayes Richard C.
Lewin Peter A.
Siegler Sorin
Walinsky Paul
Aschenbrenner Peter A.
Medelex, Inc.
Meise William H.
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