Vacuum sense control for phaco pulse shaping

A - Human Necessities – 61 – F

Patent

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Details

A61F 9/007 (2006.01)

Patent

CA 2659613

A method and apparatus for precisely controlling particle movement relative to a phacoemulsification needle tip is provided. The design monitors actual vacuum present and calculates a pulse shape amplitude waveform proportional to the amount of measured vacuum. An increase in vacuum indicates that the handpiece/needle is becoming occluded by a large particle. The present design determines whether additional power is required to bump or move a large particle away from the needle tip. The present design may employ a control loop that senses and continuously monitors vacuum. The design may dynamically vary the amount of ultrasonic energy delivered to the surgical area in response to the observed actual vacuum, and can actively vary the amount of power delivered to the surgical area based on the size of the particle and the resultant vacuum realized.

La présente invention concerne un procédé et un appareil pour commander de manière précise le mouvement de particules par rapport à une pointe d'aiguille de phaco-émulsification. Le modèle assure la surveillance de vide présent et calcule un guide d'onde d'amplitude de forme d'impulsion proportionnelle à la quantité de vide mesurée. Un accroissement de vide indique que la pièce à main/l'aiguille est obstruée par une grande particule. Le modèle selon l'invention détermine si l'énergie supplémentaire est nécessaire à la collision ou le déplacement d'une grande particule en éloignement de la pointe de l'aiguille. Le modèle selon l'invention peut utiliser une boucle de commande qui détecte et surveille en continu le vide. Le modèle peut faire varier de manière dynamique la quantité d'énergie ultrasonore émise vers la zone chirurgicale en réponse au vide réel observé, et peut activement faire varier la quantité d'énergie émise vers la zone chirurgicale en fonction de la taille de la particule et le vide ainsi obtenu.

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