US 11,752,035 B2
Ultrasonic needles and transducer assemblies formed of non-metal materials or a combination of materials
Ala Moradian, St. Louis, MO (US); Brian D. McCary, Clayton, MO (US); Toh Seng Goh, Wildwood, MO (US); and Matthew J. Fitzgerald, St. Louis, MO (US)
Assigned to BAUSCH & LOMB INCORPORATED, Rochester, NY (US)
Filed by Bausch & Lomb Incorporated, Rochester, NY (US)
Filed on Jan. 26, 2021, as Appl. No. 17/158,562.
Application 17/158,562 is a continuation of application No. 14/690,791, filed on Apr. 20, 2015, granted, now 10,932,948.
Prior Publication US 2021/0145639 A1, May 20, 2021
Int. Cl. A61F 9/007 (2006.01)
CPC A61F 9/00745 (2013.01) 3 Claims
OG exemplary drawing
 
1. A phacoemulsification transducer assembly comprising:
a reflector;
a driver connected to the reflector, the driver having a known driver vibration frequency range;
a horn connected to the driver opposite the reflector;
a needle connected to the horn opposite the driver, the needle having a known free shaft length; and
wherein to maximize a desired stroke length of the needle for a minimal amount of power applied to the driver, a material forming the needle is chosen such that a speed of sound through the material results in a quarter-wavelength distance at the driver vibration frequency range substantially equal to the needle free shaft length.