Piezoelectric device and circuitry

Abstract

The present disclosure provides a device having a circuit. The circuit includes at least one boost converter receiving power from an energy source, a square wave driver in series with the boost converter, an inductor in series with the square wave driver for converting a square wave to a sinusoidal wave, and a piezoelectric transducer in series with the inductor, the piezoelectric transducer connectable to a load. The device further includes a phase-locked loop coupled to the circuit to determine a resonance frequency of the piezoelectric transducer when the piezoelectric transducer is connected to the load.

What is claimed is: 
     
         1 . A cordless ultrasonic dental device, the device comprising:
 a housing to contain internal components of the device;   a direct current electrical power source contained within the housing;   a printed circuit board assembly located proximate to a midline of the device housing that controls the device;   an ultrasonic piezoelectric transducer located distally on the device and contained within the housing that mechanically mates to an exterior treatment tip;   a fluid source; and   a pump in fluid communication with the fluid source and the treatment tip;   wherein the printed circuit board assembly determines a loaded resonant frequency of the ultrasonic piezoelectric transducer and treatment tip through circuit elements;   wherein mechanical ultrasonic vibrations from the ultrasonic piezoelectric transducer are transferred to a treatment site via the treatment tip.   
     
     
         2 . The cordless ultrasonic dental device of  claim 1 , wherein the pump is selected from the group consisting of: an elastomeric infusion pump and a piezoelectric pump, wherein the pump is capable of producing flow rates between 0.01 and 20.0 mL per minute through the treatment tip. 
     
     
         3 . The cordless ultrasonic dental device of  claim 1 , wherein the ultrasonic piezoelectric transducer is between 40 and 60 mm in length and has a loaded resonance frequency between 25 and 50 kHz. 
     
     
         4 . The cordless ultrasonic dental device of  claim 1 , wherein the electrical power source is selected from a DC battery, a supercapacitor, a rechargeable battery, a lithium ion battery, and combinations of the same. 
     
     
         5 . The cordless ultrasonic dental device of  claim 1 , wherein the printed circuit board assembly first determines the loaded resonant frequency of the ultrasonic piezoelectric transducer and the treatment tip via a phase-lock loop in a feedback loop by identifying where an impedance is a local minimum and a phase is zero; and drives the ultrasonic piezoelectric transducer and the treatment tip at the resonant frequency via an AC voltage signal of 100 to 800 V. 
     
     
         6 . The cordless ultrasonic dental device of  claim 1 , further comprising at least one button for device operation. 
     
     
         7 . The cordless ultrasonic dental device of  claim 1 , wherein the printed circuit board assembly is capable of delivering different voltages to the ultrasonic piezoelectric transducer at the loaded resonant frequency thereby causing the ultrasonic piezoelectric transducer to ultrasonically vibrate at different amplitudes depending on the applied voltage. 
     
     
         8 . The cordless ultrasonic dental device of  claim 1 , further comprising a first controller for controlling device power levels and a second controller for controlling fluid delivery levels, wherein the first controller controls an applied voltage to the ultrasonic piezoelectric transducer and the second controller controls a fluid delivery flow rate to the treatment tip. 
     
     
         9 . The cordless ultrasonic dental device of  claim 1 , further comprising a button for controlling device power levels, wherein an input from the button results in a different voltage being supplied to the ultrasonic piezoelectric transducer at the loaded resonant frequency by the printed circuit board assembly thereby causing the ultrasonic piezoelectric transducer to ultrasonically vibrate at different amplitudes. 
     
     
         10 . The cordless ultrasonic dental device of  claim 1 , further comprising a button for controlling fluid delivery levels, wherein an input from the button results in the printed circuit board assembly operating the pump to modify an amount of fluid delivery to the treatment site via the treatment tip. 
     
     
         11 . The cordless ultrasonic dental device of  claim 1 , further comprising a first controller for controlling device power levels and a second controller for controlling fluid delivery levels, wherein a first input from the first controller results in a different voltage being supplied to the ultrasonic piezoelectric transducer at the loaded resonant frequency by the printed circuit board assembly thereby causing the ultrasonic piezoelectric transducer to ultrasonically vibrate at different amplitudes, and wherein a second input from the second controller results in the printed circuit board assembly operating the pump to modify an amount of fluid delivery to the treatment site via the treatment tip. 
     
     
         12 . The cordless ultrasonic dental device of  claim 1 , further comprising a wireless unit that communicates with the device and controls a power setting and a fluid flow rate of the device. 
     
     
         13 . The cordless ultrasonic dental device of  claim 1 , wherein the ultrasonic piezoelectric transducer includes a pre-bent horn. 
     
     
         14 . The cordless ultrasonic dental device of  claim 1 , wherein the ultrasonic piezoelectric transducer includes a pre-bent horn having a bend between about 50 degrees and about 90 degrees. 
     
     
         15 . The cordless ultrasonic dental device of  claim 1 , wherein the treatment tip is made from stainless steel, aluminum, titanium, plastic composites, or a combination thereof. 
     
     
         16 . The cordless ultrasonic dental device of  claim 1 , wherein the treatment tip is mechanically mated to a horn of the ultrasonic piezoelectric transducer via threads or quick connect means. 
     
     
         17 . The cordless ultrasonic dental device of  claim 1 , wherein the treatment tip is titanium or stainless steel and mechanically mates to the ultrasonic piezoelectric transducer via threads. 
     
     
         18 . The cordless ultrasonic dental device of  claim 1 , wherein the cordless ultrasonic dental device is used during hygiene, periodontic, endodontic, surgical, or restorative procedures. 
     
     
         19 . The cordless ultrasonic dental device of  claim 1 , wherein the printed circuit board assembly comprises:
 at least one boost converter receiving power from the direct current electrical power source;   a square wave driver connected in series with the at least one boost converter;   an inductor connected in series with the square wave driver for converting a square wave to a sinusoidal wave; and,   a phase-locked loop coupled to the printed circuit board assembly for determining the loaded resonant frequency of the ultrasonic piezoelectric transducer when the ultrasonic piezoelectric transducer is connected to the treatment tip;   wherein the inductor is connected in series with the ultrasonic piezoelectric transducer.   
     
     
         20 . The cordless ultrasonic dental device of  claim 1 , wherein the fluid source is selected from the group consisting of: a remote fluid source, an external fluid line, a syringe, or a filled fluid container.