US 12,472,766 B2
Surgical ink, production method for said ink, and surgical pen using said ink
Yutaka Maruoka, Tokyo (JP); Toshihisa Toyokuni, Hyogo (JP); Mori Yokoyama, Hyogo (JP); Kei Oomoto, Tokyo (JP); and Go Aradono, Miyazaki (JP)
Assigned to JAPAN INSTITUTE FOR HEALTH SECURITY, Tokyo (JP); and YASUI CO., LTD., Miyazaki (JP)
Appl. No. 18/834,792
Filed by National Center for Global Health and Medicine, Tokyo (JP); and YASUI Co., Ltd., Miyazaki (JP)
PCT Filed Feb. 17, 2023, PCT No. PCT/JP2023/005806
§ 371(c)(1), (2) Date Jul. 31, 2024,
PCT Pub. No. WO2023/157953, PCT Pub. Date Aug. 24, 2023.
Claims priority of application No. 2022-023504 (JP), filed on Feb. 18, 2022.
Prior Publication US 2025/0108654 A1, Apr. 3, 2025
Int. Cl. B43K 8/02 (2006.01); C09D 11/16 (2014.01)
CPC B43K 8/026 (2013.01) [C09D 11/16 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A surgical pen having radiation resistance, comprising:
a cylindrical shaft body portion having a storage part for a surgical ink; and
a pen tip portion for discharging the ink at a distal end of the shaft body portion,
wherein the pen tip portion is made of a synthetic resin, and has a bending strength of 1.0 N or more after irradiation with γ-rays of 25 kGy to 70 kGy,
the surgical ink comprises an activated carbon powder and a water-soluble organic solvent,
the surgical ink comprises
60 to 80 parts by weight of a dispersion liquid containing 8 to 10 wt % of the activated carbon powder, 5 to 7 wt % of a water-soluble polymer, 0.01 to 1.00 wt % of sodium hydroxide, and water as a residue; and
5 to 25 parts by weight of the water-soluble organic solvent, and
the surgical ink has a pH of 4 to 11, an average particle diameter of 150 to 310 nm, and a viscosity of 2.0 to 8.0 mPa·s after irradiation with γ-rays of 25 kGy to 70 kGy.