Other

Hpk Inc.

Sun Ho Choe

Sang Heon Lee

Kap Seung Yang

Chang Hyun Cho

Chang Se Woo

Chang Ha Lim

Young June Kim

Hong Min Kim

Kyung Ae Oh

Eun Ji Kim

Deog Nam Park

Provided is a method of producing a carbon fiber, the method including: a) adding an acrylonitrile-based polymer solution to a solution containing a glycol-based compound having a boiling point of 180 to 210&#xb0; C. to precipitate an acrylonitrile-based polymer; b) melt spinning the acrylonitrile-based polymer to obtain a spun fiber; and c) performing stabilization and carbonization on the spun fiber to obtain a carbon fiber.

Method of producing carbon fiber

According to an embodiment, a cordless ultrasonic surgery instrument comprises an end effector directly contacting a tissue for incision or suture of the tissue, a handpiece including at least one or more piezoelectric elements to transfer vibration energy to the end effector, a hand instrument including a controller controlling an operation of the end effector and controlling to increase power from a power source device, a shaft assembly coupled with the end effector, rotated by receiving the vibration energy from the handpiece, converting part of vibration energy according to the vibration into electrical energy, and collecting the electrical energy, and a battery supplying power to the handpiece to allow the handpiece to transfer the vibration energy to the end effector, the battery charged with the electrical energy transmitted from the shaft assembly.

Cordless ultrasonic surgery instrument capable of energy harvesting

Growing community of inventors

Jeollabuk-do, South Korea

Sun Ho Choe