Abstract:
PURPOSE: A polymer delivery system which controls and releases nitrogen monoxide is provided to stably supply nitrogen monoixde for a long time. CONSTITUTION: A delivery system for controlled-release of nitrogen monoxide is a polymer containing a main chain of organic polymers and a sub-chain which is connected to the main chain by covalent bond and has a diazenium diolate functional group. The polymer causes phase change from sol to gel in case of increasing temperature. The main chain is formed of ethylene glycol/propylene glycol copolymers. The sub-chain is formed of polyethylene imine, polypropylene imine, polypeptide, or chitosan polymers.
Abstract:
본 발명은 인 시튜( in situ ) 조직재생용 지능형 다공성 생분해 고분자 지지체 및 이의 제조방법에 관한 것으로, 구체적으로 세포분화능 및 세포친화성이 우수한 서로 다른 종류의 생리활성물질이 각각 고분자 지지체 내부에 포함되고 그의 표면에 결합되어 있는 인 시튜( in situ ) 조직재생용 지능형 다공성 생분해 고분자 지지체 및 이의 제조방법에 관한 것이다. 본 발명에 따른 다공성 생분해 고분자 지지체는 그의 표면뿐만 아니라 내부에 세포의 증식이나 분화를 유도할 수 있는 생리활성물질을 함유하고 있어 세포친화성, 생체적합성, 세포분화능 등이 우수하기 때문에 연골이나 뼈와 같은 근골격계 조직재생 시 고분자 지지체에 줄기세포를 체외 배양하여 세포/고분자 구조물 형태로 이식할 필요가 없이 바로 고분자 지지체와 줄기세포를 이식하여 생체 조직 내에서 줄기세포로부터 직접 근골격계의 인 시튜( in situ ) 조직재생을 유도할 수 있다는 장점을 갖는다. 따라서 본 발명에 따른 지능형 다공성 생분해 고분자 지지체는 줄기세포로부터 근골격계 조직을 조직공학적으로 재생하는데 유용할 뿐만 아니라 다른 조직이나 장기를 재생하는데도 효과적으로 확대 적용될 수 있다. 조직공학, 고분자 지지체, 비등성 혼합물, 지능형, 다공성, 생분해성, 생리활성물질, 성장인자
Abstract:
PURPOSE: Biomedical implants containing surface-modified metal particles and biodegradable polymers, the use of the same for suppressing inflammation, and a method for preparing the same are provided to improve the mechanical characteristic of the biodegradable polymers and to suppress the inflammation and cytotoxicity. CONSTITUTION: Biomedical implants contain surface-modified metal particles and biodegradable polymers. Acidic materials generated from the degradation of the biodegradable polymers are neutralized with basic metal particles to suppress inflammation. The basic metal particles are selected from a group including particles of a selected metal and particles of a selected metal compound. The metal is selected from a group including alkali metals and alkali earth metals. The metal compound is selected from a group including the hydroxide of alkali metals, the oxide of alkali metals, the hydroxide of alkali earth metal, and the oxide of alkali earth metal.
Abstract:
본 발명은 플라즈마-보조 화학기상증착법(Plasma-assisted chemical vapor deposition)을 이용한 나노 구조 패턴을 갖는 약물 방출용 스텐트의 제조방법 및 이로부터 제조된 약물 방출용 스텐트에 관한 것으로서, 플라즈마-보조 화학기상증착법을 통해 생분해성 고분자 표면을 나노 구조의 표면으로 개질함으로써 약물 방출용 스텐트를 제조하는 본 발명의 방법은 약물의 담지 능력을 향상시키고 약물의 방출 속도를 조절할 수 있어 약물 방출용 스텐트를 제조하는 데 유용하게 적용될 수 있다.
Abstract:
PURPOSE: A nano coating method of the surface of a drug releasing stent is provided to control the surface of a drug releasing stent in a nanometer scale. CONSTITUTION: A nano coating method of the surface of a drug releasing stent is constituted as follows. The surface of a stent is coated by spraying bio-degradable high molecule solvent containing biodegradable polymer on the surface of the stent by using an ultrasonic wave spray machine. The average drop size of the bio-degradable high molecule solvent is controlled in a size of 10-100 micrometers.
Abstract:
PURPOSE: A coating method for stents or biomedical implants by electrospray is provided to make uniform surface coating possible and to allow various functionalities. CONSTITUTION: A coating method for stents or biomedical implants by electrospray is constituted as follows. The method of coating of the stent using electrospray or the transplantation water comprises the next step. A coating solution is supplied to an injection nozzle by applying pressure to the coating solution or pushing the coating solution at a constant speed. The coating solution is electrically charged by applying high voltage from a high voltage applying device to a metal material coming into contact with the coating solution. The surface of stents or biomedical implants is coated by spraying the charged coating solution.
Abstract:
PURPOSE: A tissue compatible metallic biomaterial and a method for the preparation thereof are provided to improve tissue regeneration and tissue affinity. CONSTITUTION: A method for preparing a tissue compatible metallic biomaterial comprises: a step of introducing a hydroxy group(-OH) by oxidizing the surface of a metal material; a step of forming hydroxyapatite in the surface of the metal material by dipping the metal material in which the hydroxy group is introduced in a simulated body fluid solution; a step of forming nano particles containing bioactive substance or growth factors on the surface of the metal material in which hydroxyapatite is formed; a step of fixing nano particles containing bioactive substance or growth factors.
Abstract:
Provided is a method for preparing biodegradable dual pore polymer scaffolds for tissue engineering, wherein the prepared scaffold has high surface area and high porosity, and thus is effective in regenerating all biological tissues and organs. The method for preparing biodegradable dual pore polymer scaffolds for tissue engineering comprises the steps of: (1) preparing a polymer sample by leaving a polymer solution including biodegradable polymer, a fizzy mixture of carbonates and organic acids, and a solvent alone at a temperature of -196‹C to room temperature to evaporate solvent; and (2) putting the prepared polymer sample into an aqueous mixture solution of water and alcohol and expanding the sample to be dried. The polymer sample of the step (1) is obtained by dissolving the biodegradable polymer in a solvent/non-solvent mixture solution and then thereto adding the fizzy mixture to be homogeneously mixed, or dissolving the biodegradable polymer in organic solvent and then thereto adding the fizzy mixture in different sizes to be homogeneously mixed. In the solvent/non-solvent mixture solution, the solvent is an organic solvent in which the biodegradable polymer is soluble, and the non-solvent is a solvent in which the polymer is insoluble and which is miscible with only the organic solvent.
Abstract:
The invention relates to a photo-cured dental pit and fissure sealant composition for caries prevention: i) based on the multifunctional prepolymer mixture of 2,2-bis-(4-(2-hydroxy-3-methacryloyloxypropoxy)phenyl)propane ("Bis-GMA"), which has conventionally been used as dental pit and fissure sealant for caries prevention, and a multifunctional prepolymer formed by substituting hydrogen atoms in hydroxyl group with methacrylate groups in the Bis-GMA molecules; and ii) comprising a diluent, an inorganic filler, a photoinitiation system, and other additives. The dental pit and fissure sealant composition of the present invention is based on a multifunctional prepolymer mixture and has better physical and mechanical properties and biocompatibility than a conventional composition based on Bis-GMA only.
Abstract:
본 발명에는 하기 화학식 1로 표시되는 지환족 유도체 및 그의 제조 방법이 개시되어 있다.
-(M a ) x -(M b ) y -(M c ) u -(M d ) v -
식 중, M a 는 카르복시 또는 히드록시기를 함유한 노르보르넨 단량체로서 이고, M b 는 카르복시 또는 히드록시기를 함유한 디노르보르넨 단량체로서 이며, M c 는 전자 결핍성 단량체로서 이고, M d 는 (메트)아크릴산 에스테르 단량체로서 이며, R 1 및 R 2 는 서로 독립적으로 H 또는 산소 원자수 1 내지 4개를 갖는 이탈기, 예를 들면 H, COOH, CH 2 OH, COOC 2 H 5 , COOC(CH 3 ) 3 , 메틸 에스테르, 테트라히드로피라닐 에스테르, 테트라히드로푸라닐 에스테르, 1-에톡시에틸 에스테르 또는 t-부틸 카르보네이트이며, R 3 은 O, NH 또는 N-CH 2 CH 3 이고, R 4 는 H 또는 CH 3 이고, R 5 는 CH 3 , CH 2 CH 3 , CH 2 CH 2 CH 2 CH 3 또는 C(CH 3 ) 3 이며, x+y+u+v의 총 몰수를 기준으로, x는 0 내지 0.2, 바람직하게는 0.01 내지 0.1의 몰비를 갖는 값이고, y는 0.25 내지 0.5의 몰비를 갖는 값이며, u는 x+y이고, v는 0.1 내지 0.33의 몰비를 갖는 값이다. 이러한 지환족 유도체는 ArF 엑시머 레이저 영역에서의 투명성, 고해상도 및 고감도를 갖고, 기존의 노볼락 수지와 대등한 건식 엣칭 내성을 가지며, 기존의 알칼리 현상액을 적용할 수 있고, 특히 웨이퍼에 대한 접착성 및 현상성이 개선된다. 그러므로, 이러한 지환족 유도체를 사용하여 ArF 엑시머 레이저 가공용 고해상도 레지스트 재료를 제조할 수 있다.