Piezoelectric system for ultrasonic thermotherapy and electrotherapy

Patent metadata

Field	Value
Publication number	US-10953246-B2
Application number	US-201715817952-A
Country	US
Kind code	B2
Filing date	Nov 20, 2017
Priority date	Aug 30, 2017
Publication date	Mar 23, 2021
Grant date	Mar 23, 2021

Abstract

A piezoelectric system for ultrasonic thermotherapy and electrotherapy comprises a first piezoelectric element, a proof mass, a second piezoelectric element and an output unit. The proof mass is disposed between the first piezoelectric element and the second piezoelectric element. The first piezoelectric element is powered by a power source to generate oscillation, which is transferred by the proof mass to the second piezoelectric element so as to cause the second piezoelectric element to move and generate power. The output unit comprises a connecting surface and a tip surface. The output unit is electronically connected with the second piezoelectric element, wherein the connecting surface is connected with the first piezoelectric element and the tip surface is formed in a tapered shape. The oscillation from the first piezoelectric element and the power generated by the second piezoelectric element are output through the tip surface.

First claim

What is claimed is:

1. A piezoelectric system for ultrasonic thermotherapy and electrotherapy applied on a working surface, comprising:
a first piezoelectric element powered by a power source to generate an oscillation;
a second piezoelectric element;
a proof mass disposed between the first piezoelectric element and the second piezoelectric element, the proof mass being provided for transferring the oscillation to the second piezoelectric element so as to cause the second piezoelectric element to generate power; and
an output unit comprising a connecting surface, a hollow tube body and a tip surface, the first piezoelectric element being disposed between the output unit and the proof mass, the output unit being electrically connected with the second piezoelectric element, the tip surface being disposed within a hollow portion of the hollow tube body,
wherein the connecting surface is connected with the first piezoelectric element and the tip surface is formed in a tapered shape such that the oscillation from the first piezoelectric element and the electrical power generated by the second piezoelectric element are output through the tip surface, and
wherein the tip surface is a positive output terminal of the power source and an end surface of the hollow tube body is a negative output terminal of the power source and both the tip surface and the end surface are adapted to touch the working surface.

2. The piezoelectric system for ultrasonic thermotherapy and electrotherapy as claimed in claim 1 , wherein the hollow tube body comprises a slant cut surface located at the end surface.

3. The piezoelectric system for ultrasonic thermotherapy and electrotherapy as claimed in claim 1 , comprising a drive controller electrically connected with the first piezoelectric element to drive the first piezoelectric element at a plurality of resonant frequencies.

4. The piezoelectric system for ultrasonic thermotherapy and electrotherapy as claimed in claim 3 , wherein the plurality of resonant frequencies is the resonant frequencies of the first piezoelectric element and the second piezoelectric element coupling with each other.

5. The piezoelectric system for ultrasonic thermotherapy and electrotherapy as claimed in claim 3 , comprising a microprocessor electrically connected with the first piezoelectric element, wherein the microprocessor uses frequency hopping technology to control square waves of the plurality set of resonant frequencies to output periodically hopped frequencies, thereby providing a Frequency Modulation (FM) effect.

6. The piezoelectric system for ultrasonic thermotherapy and electrotherapy as claimed in claim 1 , wherein the proof mass comprises a first end surface and a second end surface relative to the first end surface, the first end surface comprises a diameter R 1 , the second end surface comprises a diameter R 2 , and the proof mass comprises a first length L 1 , which is obtained by the following formula:

L
1

=

c

2
⁢
f

⁡

[

1
+

(

ln
⁢

⁢
N

π

)

2

]

1
2

,

where c is a longitudinal acoustic velocity, f is an operating frequency of the piezoelectric system for ultrasonic thermotherapy and electrotherapy, and

N
=

R
1

R
2

,

where N is a diameter ratio of the first end surface to the second end surface.

7. The piezoelectric system for ultrasonic thermotherapy and electrotherapy as claimed in claim 6 , wherein the connecting surface comprises a diameter R 3 , the tip surface comprises a diameter R 4 , and the output unit comprises a second length L 2 , wherein the second length L 2 is obtained by the following formula:

L
2

=

c

2
⁢
f

⁡

[

1
+

(

ln
⁢

⁢
N

π

)

2

]

1
2

,

where c is a longitudinal acoustic velocity, f is the operating frequency of the piezoelectric system for ultrasonic thermotherapy and electrotherapy, and

N
=

R
3

R
4

,

where N is a diameter ratio of the connecting surface to the tip surface.

8. The piezoelectric system for ultrasonic thermotherapy and electrotherapy as claimed in claim 1 , wherein the connecting surface comprises a diameter R 3 , the tip surface comprises a diameter R 4 , and the output unit comprises a second length L 2 , wherein the second length L 2 is obtained by the following formula:

Assignees

• Univ Chung Yuan Christian

Inventors

• Ting Yung
• Lin Sheuan-Perng
• Yu Chih-Hsuan

Classifications

• B06B1/023 Primary

  and stepped in amplitude, e.g. square wave, 2-level signal · CPC title

• A61H39/007

  Stimulation by mechanical vibrations, e.g. ultrasonic · CPC title

• A61H39/002

  Using electric currents (electrotherapy A61N1/32) · CPC title

• A61N2007/0026

  Stimulation of nerve tissue · CPC title

• A61H39/08

  Devices for applying needles to such points, i.e. for acupuncture {; Acupuncture needles or accessories therefor} · CPC title