US 12,251,583 B2
Cavitation based tissue removal device using focused ultrasound
Ki Joo Pahk, Seoul (KR); Jeong Min Heo, Seoul (KR); and Jun Hong Park, Seoul (KR)
Assigned to KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY, Seoul (KR)
Filed by KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY, Seoul (KR)
Filed on May 31, 2022, as Appl. No. 17/828,041.
Claims priority of application No. 10-2021-0072760 (KR), filed on Jun. 4, 2021.
Prior Publication US 2022/0387826 A1, Dec. 8, 2022
Int. Cl. A61N 7/02 (2006.01); A61B 8/00 (2006.01); A61B 8/08 (2006.01); A61N 7/00 (2006.01)
CPC A61N 7/02 (2013.01) [A61B 8/08 (2013.01); A61B 8/461 (2013.01); A61N 2007/0008 (2013.01); A61N 2007/0047 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A cavitation based tissue removal device using focused ultrasound, comprising:
a focused ultrasound output unit to output the focused ultrasound when a first mode or a second mode is selected;
a mode setting unit to set an output mode of the focused ultrasound; and
a control unit programmed to operate the focused ultrasound output unit in the first mode when the first mode is selected, and to operate the focused ultrasound output unit in the second mode when the second mode is selected,
wherein, in the first mode, the control unit controls the focused ultrasound output unit to remove a tissue in a local area using a vapor bubble formed by the focused ultrasound,
wherein, in the first mode, the control unit controls the focused ultrasound output unit such that the focused ultrasound forms scattered bubble clouds around the vapor bubble by a shock scattering effect,
wherein, in the second mode, the control unit controls the focused ultrasound output unit to remove a tissue in a narrower area than the first mode by automatically controlling the output characteristics of the focused ultrasound immediately after the vapor bubble is formed by the focused ultrasound, and
wherein, in the second mode, the control unit controls the focused ultrasound output unit such that the focused ultrasound only forms the vapor bubble in the tissue without forming the scattered bubble clouds by suppressing the shock scattering effect.
 
10. A cavitation based tissue removal device using focused ultrasound, comprising:
a focused ultrasound output unit to output the focused ultrasound;
a mode setting unit to set an output mode of the focused ultrasound; and
a control unit to control output characteristics of the focused ultrasound according to the set mode,
wherein the output mode is selected from:
a first mode for removing a tissue in a local area using a vapor bubble formed by the focused ultrasound; and
a second mode for removing a tissue in a narrower area than the first mode by controlling the output characteristics of the focused ultrasound immediately after the vapor bubble is formed by the focused ultrasound,
wherein in the first mode, the focused ultrasound is controlled to have a frequency of 0.1 to 30 MHz, a pulse length of 0.1 to 100 ms, and a pressure of a maximum positive pressure of 40 MPa or above and a maximum negative pressure of −10 MPa or below, and
wherein in the second mode, the focused ultrasound is outputted in a same pressure intensity condition as the first mode for a predetermined time, and immediately after the vapor bubble is formed, is controlled to have the pulse length of 1 to 100 ms and the pressure of the maximum positive pressure of 40 MPa or below and the maximum negative pressure of −10 MPa or above.
 
14. A cavitation based tissue removal device using focused ultrasound, comprising:
a focused ultrasound output unit to output the focused ultrasound;
a mode setting unit to set an output mode of the focused ultrasound; and
a control unit to control output characteristics of the focused ultrasound according to the set mode,
wherein the output mode is selected from:
a first mode for removing a tissue in a local area using a vapor bubble formed by the focused ultrasound; and
a second mode for removing a tissue in a narrower area than the first mode by controlling the output characteristics of the focused ultrasound immediately after the vapor bubble is formed by the focused ultrasound,
wherein the output mode further includes a third mode for tightening a skin without damaging the tissue by generating heating in a subcutaneous fat layer using the focused ultrasound of lower intensity and a longer pulse length than the first mode and the second mode.