System and method for driving an ultrasonic handpiece as a function of the mechanical impedance of the handpiece
AssigneeStryker Corporation
InventorsAdam Downey, Matthew Owen
Life of this patent
Estimating the term…
Abstract
An ultrasonic surgical tool system for actuating a handpiece with a tip. The frequency of the drive signal applied to the handpiece drivers is a function of the equivalent of current through the mechanical components of the handpiece and tip and the frequency responsiveness of these components.
Claims18
A system for vibrating a tip of an ultrasonic instrument, the ultrasonic instrument having at least one driver to which an AC drive signal is applied to vibrate the tip and at least one memory device storing data indicative of a maximum equivalent of current that should be applied to mechanical components of the instrument, the system comprising:
- a control console for generating the AC drive signal that is applied to the at least one driver of the ultrasonic instrument;
- and
- a foot pedal connected to the control console,
- wherein the control console is configured to:
- read the maximum equivalent of current data from the at least one memory device of the ultrasonic instrument;
- responsive to the foot pedal being depressed, determine an extent of the depression of the foot pedal;
- calculate a target equivalent of current to be applied to the mechanical components of the instrument based on the read maximum equivalent of current data and the extent of the depression of the foot pedal;
- and
- set a characteristic of the AC drive signal based on the calculated target equivalent of current.
A method for regulating an AC drive signal sourced from a control console to an ultrasonic instrument to vibrate a tip of the ultrasonic instrument, the ultrasonic instrument having at least one driver to which an AC drive signal is applied to vibrate the tip and at least one memory device storing data indicative of a maximum equivalent of current that should be applied to mechanical components of the instrument, the control console being connected to a foot pedal, the method comprising:
- reading, by the control console, the maximum equivalent of current data from the at least one memory device of the ultrasonic instrument;
- determining, by the control console, a depression of the foot pedal and an extent of the depression;
- calculating, by the control console, a target equivalent of current to be applied to the mechanical components of the instrument based on the read maximum equivalent of current data and the extent of the depression of the foot pedal;
- and
- setting, by the control console, a characteristic of the AC drive signal based on the calculated target equivalent of current.
Dependencies are inferred from the claim text.