US 12,447,335 B2
Hand piece for skin treatment apparatus
Yong Seok Park, Seoul (KR); and Suji Lee, Seongnam-si (KR)
Assigned to VIOL CO., LTD., Seongnam-si (KR)
Appl. No. 18/713,270
Filed by VIOL CO., LTD., Seongnam-si (KR)
PCT Filed Jun. 27, 2023, PCT No. PCT/KR2023/008978
§ 371(c)(1), (2) Date May 24, 2024,
PCT Pub. No. WO2024/005519, PCT Pub. Date Jan. 4, 2024.
Claims priority of application No. 10-2022-0080906 (KR), filed on Jun. 30, 2022.
Prior Publication US 2025/0121183 A1, Apr. 17, 2025
Int. Cl. A61N 1/08 (2006.01); A61N 1/20 (2006.01); A61N 1/40 (2006.01); A61N 7/00 (2006.01)
CPC A61N 1/08 (2013.01) [A61N 1/205 (2013.01); A61N 1/40 (2013.01); A61N 7/00 (2013.01); A61N 2007/0034 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A hand piece for a skin treatment apparatus, the hand piece comprising:
a hand piece body capable of being operated by a user hand;
a skin treatment unit connected to an end of the hand piece body, and treating a user skin;
a pressure sensing unit installed on the skin treatment unit, and sensing a pressure between the skin and the skin treatment unit; and
a pressure display unit emitting light in a plurality of colors corresponding to respective ranges of on a pressure value measured by the pressure sensing unit,
wherein the pressure sensing unit includes a plurality of elastic assemblies change in length in response to the pressure at which the skin treatment unit presses on the skin,
wherein the elastic assembly includes
an upper elastic body adjacent to the skin treatment unit,
a lower elastic body adjacent to the hand piece body, and
an intermediate elastic body disposed between the upper elastic body and the lower elastic body, and
wherein an elastic modulus of the intermediate elastic body is within a predetermined pressure reference range,
an elastic modulus of the upper elastic body is below the predetermined pressure reference range, and
an elastic modulus of the lower elastic body is above the predetermined pressure reference range.