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Home > Products > PZT Piezoelectric Elements > PZT Piezoelectric Hemisphere > High Frequency 7MHz Piezo Hemisphere OD19x7MHz

High Frequency 7MHz Piezo Hemisphere OD19x7MHz

High Frequency 7MHz Piezo Hemisphere OD19x7MHz

Basic Info

    Model No.: OD19*7MHz R 16.5 PZT-43

Product Description

Piezoelectric ceramic hemisphere

Electrode direction: thickness direction


Applications: High Intensity Focused Ultrasound, high power Ultrasonic Transducer


HIFU high intensity focused ultrasound (HIFU) is a new technique of ultrasound surgery developed in the 1940s. It uses ultrasound as energy source, uses its penetration and focusing mode to focus the ultrasound energy on the SMAS layer of human body, forms a high sound intensity area in SMAS, which can penetrate into 3.0mm-4.5mm subcutaneously and make the temperature of SMAS tissue reach 65 degrees C within 0.5-1 seconds. Upper (the strongest temperature of all non-invasive skin-tightening instruments) results in collagen recombination in SMAS tissues without damaging normal tissues outside the focal area, thus achieving the effect of fascial elevation.


Focused ultrasound system has good tissue penetration and localization. It can focus energy through surface tissue and target tissue at a specific depth to produce biological effects, which can make the pathological tissue recover quickly. The dosage of focused ultrasound therapy is easy to control and safe. After treatment, only local tissue has transient congestion and edema, and surface cells can remain intact, quick recovery.

Ultrasound focusing has good tissue penetration and energy storage. The host generates high-frequency electrical signals, which are converted into focused ultrasound by transducer. The ultrasound is transmitted to the lesion tissues by circulating water system, sound transmission membrane and contact coupling agent. Ultrasound can produce thermal effect, mechanical effect, cavitation effect and biochemical effect in biological tissues. Polaris uses these characteristics to act on pathological tissues to degenerate them, promote tissue reconstruction and improve microcirculation to achieve therapeutic purposes.



Material: PZT-43( hard PZT P-4D)


Technical data:

Dimensions: diameter 19mm, thickness according to frequency 7MHz, R 16.5

Thickness Frequency Ft: 7MHz ± 5%

Radial Frequency Fr: 113KHz ± 3KHz

Electromechanical coupling coefficient Kp: ≥ 0.58

Resonant impedance Zm: ≤ 7 Ω

Dielectric Loss tg δ: 0.5%

Static capacitance Cs: 14000pF± 12.5%



Test Condition: 25±3 °C 40~70% R.H.
fr, Zm, Kr => Radial mode vibration
Cs tanδ => LCR meter at 1KHz 1Vrms




YUHAI piezo material for HIFU ceramic parts:


Typical value of Piezoelectric ceramic materials performance
"Hard" PZT materials
Properties PZT-41 PZT-42 PZT-43 PZT-82
Dielectric Constant ɛTr3 1050 1250 1420 1100
Coupling factor KP 0.58 0.58 0.58 0.52
K31 0.32 0.33 0.34 0.3
K33 0.66 0.67 0.68 0.57
Kt 0.48 0.48 0.48 0.4
Piezoelectric coefficient d31 10-12m/v -106 -124 -138 -100
d33 10-12m/v 260 280 300 240
g31 10-3vm/n -11.4 -11.2 -11 -10.3
g33 10-3vm/n 28 25.3 24 25
Frequency coefficients Np 2280 2200 2160 2280
N1 1671 1613 1583 1671
N3 1950 1900 1875 1950
Nt 2250 2200 2200 2300
Elastic compliance coefficient Se11 10-12m2/n 11.8 12.7 13.2 11.6
Machanical quality factor Qm 1000 800 600 1200
Dielectric loss factor Tg δ % 0.3 0.4 0.5 0.3
Density ρ g/cm3 7.5 7.5 7.5 7.6
Curie Temperature Tc °C 320 320 320 310
Young's modulus YE11 <109N/m3 85 79 76 86
Poison Ratio 0.3 0.3 0.3 0.3

Piezo element HIFU



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Product Categories : PZT Piezoelectric Elements > PZT Piezoelectric Hemisphere

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