Method for detecting transverse mode vibrations in an ultrasonic hand piece/blade
First Claim
1. A method for detecting transverse vibrations in an ultrasonic hand piece/blade, comprising:
- applying a drive signal to the hand piece/blade using an ultrasonic generator;
monitoring a change over time of the drive signal;
measuring a level of an output signal from a filter;
comparing the output signal to a predetermined level; and
if the output signal exceeds the predetermined level, displaying a message on a liquid crystal display of the generator.
2 Assignments
0 Petitions
Accused Products
Abstract
A method for detecting transverse mode vibrations in an ultrasonic hand piece/blade for determining the existence of unwanted vibration in the hand piece/blade. A tracking filter centered at the drive frequency of the generator, is used to monitor the drive frequency of the ultrasonic generator and attenuate the drive signal when it exceeds a predetermined level. The tracking filter has a wide pass band. Alternatively, a tracking filter having a pass band which is divided into several regions is used to avoid other longitudinal resonances, such as a resonance at a second harmonic, or other spectral features that would otherwise detract from the tracking accuracy of the filter.
8 Citations
22 Claims
-
1. A method for detecting transverse vibrations in an ultrasonic hand piece/blade, comprising:
-
applying a drive signal to the hand piece/blade using an ultrasonic generator;
monitoring a change over time of the drive signal;
measuring a level of an output signal from a filter;
comparing the output signal to a predetermined level; and
if the output signal exceeds the predetermined level, displaying a message on a liquid crystal display of the generator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
-
-
12. A method for detecting transverse vibrations in an ultrasonic hand piece/blade, comprising:
-
applying a drive signal to the hand piece/blade using an ultrasonic generator;
monitoring a change with respect to load of a rms value of an output signal from a filter;
comparing the change with respect to load of the rms value output from the filter to a predetermined level; and
displaying a message on a display, if the rms value exceeds the predetermined level.
-
Specification