Pzt Material Piezo Ceramics Ring Piezoceramic Transducers for Ultrasonic Lithotripsy
Product Description
Pzt Material Piezo Ceramics Ring Piezoceramic Transducers for Ultrasonic Lithotripsy
1.Some Standard Size of Piezo Ring
Range Of piezo ceramic ring
External diameter: 5.0 - 100mm
Internal diameter :(2.0 - 35mm)
Thickness : (0.2 - 15mm)
Choice of metallisation (Silver, Nickel, Gold and others on request)
Wide choice of PZT formulations
2.Typical value of "Hard" PZT materials performance：
Hard" PZT materials |
|||||||
Properties |
PZT-41 |
PZT-42 |
PZT-43 |
PZT-82 |
PBaS-4 |
||
Dielectric Constant |
ɛTr3 |
1050 |
1250 |
1420 |
1100 |
1900 |
|
Coupling factor |
KP |
0.58 |
0.58 |
0.58 |
0.52 |
0.59 |
|
K31 |
0.32 |
0.33 |
0.34 |
0.3 |
0.34 |
||
K33 |
0.66 |
0.67 |
0.68 |
0.57 |
0.68 |
||
Kt |
0.48 |
0.48 |
0.48 |
0.4 |
0.49 |
||
Piezoelectric coefficient |
d31 |
10-12m/v |
-106 |
-124 |
-138 |
-100 |
-160 |
d33 |
10-12m/v |
260 |
280 |
300 |
240 |
380 |
|
g31 |
10-3vm/n |
-11.4 |
-11.2 |
-11 |
-10.3 |
-9.5 |
|
g33 |
10-3vm/n |
28 |
25.3 |
24 |
25 |
22.6 |
|
Frequency coefficients |
Np |
2280 |
2200 |
2160 |
2280 |
2200 |
|
N1 |
1671 |
1613 |
1583 |
1671 |
1613 |
||
N3 |
1950 |
1900 |
1875 |
1950 |
1850 |
||
Nt |
2250 |
2200 |
2200 |
2300 |
2200 |
||
Elastic compliance coefficient |
Se11 |
10-12m2/n |
11.8 |
12.7 |
13.2 |
11.6 |
13.2 |
Machanical quality factor |
Qm |
1000 |
800 |
600 |
1200 |
2200 |
|
Dielectric loss factor |
Tg δ |
% |
0.3 |
0.4 |
0.5 |
0.3 |
0.5 |
Density |
ρ |
g/cm3 |
7.5 |
7.5 |
7.5 |
7.6 |
7.5 |
Curie Temperature |
Tc |
°C |
320 |
320 |
320 |
310 |
310 |
Young's modulus |
YE11 |
<109N/m3 |
85 |
79 |
76 |
86 |
76 |
Poison Ratio |
0.3 |
0.3 |
0.3 |
0.3 |
0.33 |
3. STANDARD MECHANICAL TOLERANCES:
Outside Diameter ±0.150mm
Inside Diameter ±0.150mm
Thickness ±0.05mm
Flatness 0.002**/0.012mm MAX
Parallelism 0.007**/0.012mm MAX
Concentricity 0.2mm
4.Ultrasonic Lithotripsy Application:
The first practical application of ultrasound took place in France in 1916 when Chilowsky and Langevin patented the use of ultrasonic sonar for the underwater localization of submarines. Ultrasonic energy is produced when alternating electrical current is applied to plates on the opposing sides of a crystal. The resultant mechanical vibrations of the crystal propagate waves of energy at a constant frequency, as determined by the voltage applied to the plates and the nature of the crystal. Observations of the disruptive effects of the first sonar on marine life led to the elucidation of the mechanism by which the ultrasonic vibrations affect objects within their path. The high frequency energy waves of ultrasound alternately compress and pull on particles within the radiation field. In transmission media such as water, this results in cavitation. When these cavities rapidly collapse instantaneous pressure is produced with magnitude and force capable of destroying solid objects. Early attempts to fragment urinary and biliary stones by the direct application of ultrasound were unsuccessful due to the high electrical energy requirements and difficulties in conducting and focusing the ultrasonic energy. In the early 1970s the ultrasonic lithotrite was developed. Rather than relying on the direct application of ultrasound energy and the resultant cavitation to disintegrate stones, the ultrasonic lithotrite uses an ultrasound transducer to rapidly vibrate a hollow probe and longitudinally transmit mechanical energy to the surface of stone, causing fragmentation in the same manner a drill. The hollow USL probe facilitates simultaneous suction removal of stone fragments and constant flow irrigation aids in fragment removal and cools the USL probe to reduce the risk of thermal damage to adjacent tissues .
5.Application Image: