Abstract:
A mats with the coated nano-fiber and a manufacturing method thereof are provided to control the alignment angle of the coated nano-fiber by changing the rotation speed of a collector. High voltage is applied to a cylindrical nozzle block(2) with a double tube shape. A portion of a sidewall of the cylindrical nozzle block is incised and opened. A mat(6) is the two-dimensional fiber member such as the woven cloth, texture and knitted goods, membrane and the like and supplied continuously from a supply roller(5). When performing the electric spinning, the cylindrical nozzle block and a rotation cylindrical collector are used simultaneously. The cylindrical nozzle block is moved upwardly and downwardly so that the nano fiber is uniformly coated on the mat.
Abstract:
Disclosed is a functional operative needle holder. The disclosed operative needle holder includes: a grip knob which a user is to grip and has a circular bar shape; an outer and an inner grip plate which are installed not to rotate around the front end of the grip knob and between which the gap can be widened or narrowed to hold or release an operative suture needle; a push handle which is installed on the grip knob, is connected to the inner grip plate, and narrows down the gap between the outer and the inner grip plate by push operation of the user; an outer and an inner moving plate which are installed at the front end of the grip knob to be rotatable and between which the gap can be widened or narrowed to hold or release the operative suture needle; a moving handle which is installed on the grip knob, is connected to the outer and the inner moving plate, and controls the gap between the outer and the inner moving plate by rotation operation of the user; and a moving knob which is installed on the grip knob, is connected to the outer and the inner moving plate, and rotates the outer and the inner moving plate by rotation operation of an operator.
Abstract:
본 발명에 따른 나노섬유의 제조방법은 원통상 형태 및 원추형 형태 중에서 선택된 1종의 형태를 구비하고 내부 표면에 홈 및 돌기 중에서 선택된 1종의 형상물이 형성되어 있는 방사튜브내로 고분자 용액 및 고분자 용융체 중에서 선택된 1종으로 이루어진 방사용액을 공급한 다음, 상기 방사튜브를 3,000rpm 이상으로 회전시켜 원심력으로 상기 방사용액을 나노섬유 형태로 방사함과 동시에 상기 방사튜브 외부에 설치된 기체분사용 튜브를 통해 기체를 방사튜브 보다 높은 상부 위치에 설치된 컬렉터 방향으로 분사하여, 방사된 나노섬유를 상기 컬렉터 상에 집적하는 것을 특징으로 한다. 본 발명은 정전기력 없이 순수한 원심력만을 이용하여 높은 전단력으로 고분자 용융체의 점도를 고분자의 분해 없이도 낮출 수 있기 때문에 고분자 용액은 물론 고분자 용융체으로부터도 나노섬유를 높은 생산성(토출량)으로 제조할 수 있다. 또한 본 발명은 종래의 방사 노즐을 사용하지 않기 때문에 노즐교체나 노즐청소 등의 번거로운 작업을 생략할 수 있고, 컬렉터 등에 고전압을 인가하지 않아도 되기 때문에 작업 위험성도 피할 수 있고, 드롭발생 현상도 효과적으로 방지할 수 있다.
Abstract:
The present invention relates to a method for manufacturing water insoluble chitosan / polyvinyl alcohol hybrid nanofibers, comprising : manufacturing a chitosan-containing acetic acid aqueous solution by adding chitosan into an acetic acid aqueous solution having less than 60 wt% of acetic acid content and then irradiating radiation to the chitosan-containing acetic acid aqueous solution; manufacturing an aqueous solution for electric radiation by adding polyvinyl alcohol and a cross linking agent into the manufactured chitosan-containing acetic acid aqueous solution; and manufacturing water insoluble chitosan / polyvinyl alcohol hybrid nanofibers by manufacturing chitosan / polyvinyl alcohol hybrid nanofibers by performing electric radiation to the aqueous solution for electric radiation and then performing a heat-treatment to it. The present invention can easily dissolve chitosan with a minimum amount of an organic solvent using radiation, and thereby, produce effects of preventing environmental pollution and energy waste, reducing waste water treatment costs, and further enhancing biocompatibility. In addition, the present invention can omit the process of separately sterilizing the water insoluble chitosan / polyvinyl alcohol hybrid nanofibers manufactured due to disinfection effects produced by radiation irradiation. Thereby, the hybrid nanofibers manufactured by the method of the present invention has excellent biocompatibility, and therefore, is useful as medical material.