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Guyon Sound

Curved, malleable urethral sound — named for Jean Casimir Félix Guyon (1831–1920, Paris), the founder of French urology.

Design​

  • Curved profile follows the natural path of the male urethra
  • Malleable shaft on some variants — can be bent to match individual anatomy
  • Graduated set in French sizes, typically 8–36 Fr

Key Uses​

  • Atraumatic urethral dilation and calibration
  • Instrument set for urethral reconstruction
  • Historically central to the French school's approach to urethral stricture management

History​

Jean Casimir Félix Guyon founded the chair of urology at the Hôpital Necker in Paris and is considered the father of French urology. His pupils carried the discipline across continental Europe. The Guyon sound is one of several instruments and eponyms (Guyon's canal, Guyon's sign) that preserve his name.

See also: Van Buren Sound, Haygrove Sound.