Title:
ULTRASOUND TREATMENT TOOL
Document Type and Number:
WIPO Patent Application WO/2020/174532
Kind Code:
A1
Abstract:
This ultrasound treatment tool comprises: a piezoelectric element that has a cylindrical shape having therein a cavity filled with a liquid that propagates ultrasound, and in which the polarization direction is the thickness direction connecting an inner peripheral surface to an outer peripheral surface; and an outer cylinder that retains the piezoelectric element with a gas layer provided on the outer peripheral surface side of the piezoelectric element. The piezoelectric element respiration-oscillation resonant frequency may be equivalent to the resonant frequency in the radial direction of the liquid in the cavity. The ratio of the length of the piezoelectric element in the lengthwise direction in relation to the inner diameter of the piezoelectric element may be 3.5 or greater.
Inventors:
ITO HIROSHI (JP)
UMEMURA SHINICHIRO (JP)
YOSHIZAWA SHIN (JP)
UMEMURA SHINICHIRO (JP)
YOSHIZAWA SHIN (JP)
Application Number:
PCT/JP2019/007064
Publication Date:
September 03, 2020
Filing Date:
February 25, 2019
Export Citation:
Assignee:
OLYMPUS CORP (JP)
International Classes:
A61B17/22; A61N7/00
Foreign References:
| JPH06217989A | 1994-08-09 | |||
| JPS5220412B2 | 1977-06-03 |
Attorney, Agent or Firm:
MATSUNUMA Yasushi et al. (JP)
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