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Doctoral Thesis
DOI
https://doi.org/10.11606/T.98.2018.tde-04102017-140345
Document
Author
Full name
Adriana Del Monaco De Maria
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2017
Supervisor
Committee
Andrade, Aron Jose Pazin de (President)
Abizaid, Alexandre Antonio Cunha
Bock, Eduardo Guy Perpétuo
Santos, Rosana Nunes dos
Title in Portuguese
Estudo do revestimento de modelos de stents coronários biorreabsorvíveis de PLLA com PLDLA/PLGA e ácido hialurônico
Keywords in Portuguese
Stents farmacológicos
Biopolímeros
Implantes absorvíeis
Materiais biocompatíveis
Abstract in Portuguese
A doença arterial coronariana vem sendo a maior causa de mortalidade no mundo, a angioplastia com implante de stent é uma estratégia importante nestes casos. Estudos apontam a biodegradabilidade, imobilização de antiproliferativos e moléculas bioativas nos stents, como características das futuras gerações destes dispositivos. Dentre estas, o ácido hialurônico contribui para a diminuição da agregação e proliferação de células entre as camadas da artéria e o dispositivo implantado. Foram desenvolvidos modelos de stents coronários biorreabsorvíveis de poli(-L-ácido láctico) (PLLA) com enxertia de ácido hialurônico (HA) em poli(-ácido lático co-ácido glicólico) (PLGA) e poli(L-D-ácido lático) (PLDLA). Os modelos foram caracterizados quanto suas propriedades térmicas, mecânicas e de superfície. O PLDLA e PLGA com enxertia de HA modificado com dihidrazida adípica (ADH) apresentaram características de superfície mais hidrofílicas, ideais para material de revestimento dos dispositivos. Desta forma, este trabalho possibilitou o desenvolvimento dos modelos físicos biorreabsorvíveis, com dimensões semelhantes aos stents coronários, feitos de PLLA, revestidos com PLGA e PLDLA com enxertia de HA e HAADH, e estáveis aos processos de esterilização por radiação ultravioleta e plasma de peróxido de hidrogênio.
Title in English
Study of bioresorbable coronary PLLA stents models coating with PLDLA/PLGA and hialurônic acid
Keywords in English
Absorbable Implants
Biocompatible Materials
Biopolymers
Drug-Eluting Stents
Abstract in English
Coronary artery disease has been world´s leading cause of death and angioplasty stent implantation is an important strategy in these cases. Studies indicate that the biodegradability, immobilization of antiproliferatives and bioactive molecules in stents are characteristics of future generations of these medical devices. Amongst them, hyaluronic acid (HA) contributes to the decrease of the aggregation and proliferation of cells between artery layers and implanted device. For this purpose, poly (L-lactic acid) (PLLA) bioresorbable coronary stents with HA grafting in poly (lactic acid-co-glycolic acid) (PLGA) and poly (LD- (PLDLA) were developed. The models were characterized as their thermal, mechanical and surface properties. PLDLA and PLGA with adipic dihydrazide (ADH) modified HA grafting presented more hydrophilic surface characteristics, ideal as coating material of this devices. This project allowed the development of bioresorbable physical models with similar dimensions to coronary stents, made of PLLA, coated with PLGA and PLDLA with hyaluronic acid grafting, stable to ultraviolet radiation and plasma sterilization with hydrogen peroxide processes.
 
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Publishing Date
2018-02-05
 
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