Trends in sustainable chitosan-based hydrogel technology for circular biomedical engineering: A review.

Eco-friendly materials have emerged in biomedical engineering, driving major advances in chitosan-based hydrogels. These hydrogels offer a promising green alternative to conventional polymers due to their non-toxicity, biodegradability, biocompatibility, environmental friendliness, affordability, and easy accessibility. Known for their remarkable properties such as drug encapsulation, delivery capabilities, biosensing, functional scaffolding, and antimicrobial behavior, chitosan hydrogels are at the forefront of biomedical research. This paper explores the fabrication and modification methods of chitosan hydrogels for diverse applications, highlighting their role in advancing climate-neutral healthcare technologies. It reviews significant scientific advancements and trends chitosan hydrogels focusing on cancer diagnosis, drug delivery, and wound care. Additionally, it addresses current challenges and green synthesis practices that support a circular economy, enhancing biomedical sustainability. By providing an in-depth analysis of the latest evidence on climate-neutral management, this review aims to facilitate informed decision-making and foster the development of sustainable strategies leveraging chitosan hydrogel technology. The insights from this comprehensive examination are pivotal for steering future research and applications in sustainable biomedical solutions.

Engineering focusing on cancer.

While cancer research and care have benefited from revolutionary advances in the ability to manipulate and study living systems, the field is limited by a lack of synergy to leverage the power of engineering approaches. Cancer engineering is an emerging subfield of biomedical engineering that unifies engineering and cancer biology to better understand, diagnose, and treat cancer. We highlight cancer engineering's unique challenges, the importance of creating dedicated centers and departments that enable translational collaboration, and educational approaches to arm a new generation of scientists with engineering expertise and a fundamental understanding of cancer biology to transform clinical cancer care.

Engineering cancer's end: An interdisciplinary approach to confront the complexities of cancer.

Cancer engineering is an interdisciplinary approach that promises to confront the complexities of cancer and accelerate transformative discoveries by integrating innovative fields across engineering and the physical sciences with a focus on cancer. We offer a conceptual framework for the hallmarks of cancer engineering, integrating 12 fields: system dynamics; imaging, radiation, and spectroscopy; robotics and controls; solid mechanics; fluid mechanics; chemistry and nanomaterials; mathematics and simulation; cellular and protein engineering; kinetics and thermodynamics; materials science; manufacturing and biofabrication; and microsystems.

Implementing a challenge-based learning experience in a bioinstrumentation blended course.

BACKGROUND: Bioinstrumentation is essential to biomedical engineering (BME) undergraduate education and professional practice. Several strategies have been suggested to provide BME students with hands-on experiences throughout the curriculum, promoting their preparedness to pursue careers in industry and academia while increasing their learning and engagement. This paper describes the implementation of challenge-based learning (CBL) in an undergraduate bioinstrumentation blended course over the COVID-19 pandemic. METHODS: The CBL experience was implemented in a third-year bioinstrumentation course from the BME program at Tecnologico de Monterrey. Thirty-nine students enrolled in two sections formed fourteen teams that tackled blended learning activities, including online communication, lab experiments, and in-person CBL activities. Regarding the latter, students were challenged to design, prototype, and test a respiratory or cardiac gating device for radiotherapy. An institutional student opinion survey was used to assess the success of our CBL implementation. RESULTS: Student responses to the end-of-term survey showed that they strongly agreed that this course challenged them to learn new concepts and develop new skills. Furthermore, they rated the student-lecturer interaction very positively despite the blended format. Overall, students assessed their learning experience positively. However, implementing this CBL experience required a substantial time increase in planning, student tutoring, and constant communication between lecturers and the industry partner. CONCLUSION: This work provides an effective instance of CBL for BME education to improve students' learning experience despite decreased resource efficiency. Our claim is supported by the student's performance and the positive feedback from our industrial partner.

The use of supramolecular systems in biomedical applications for antimicrobial properties, biocompatibility, and drug delivery.

Supramolecular chemistry is versatile for developing stimuli-responsive, dynamic and multifunctional structures. In the context of biomedical engineering applications, supramolecular assemblies are particularly useful as coatings for they can closely mimic the natural structure and organisation of the extracellular matrix (ECM), they can also fabricate other complex systems like drug delivery systems and bioinks. In the current context of growing medical device-associated complications and the developments in the controlled drug delivery and regenerative medicine fields, supramolecular assemblies are becoming an indispensable part of the biomedical engineering arsenal. This review covers the different supramolecular assemblies in different biomedical applications with a specific focus on antimicrobial coatings, coatings that enhance biocompatibility, surface modifications on implantable medical devices, systems that promote therapeutic efficiency in cancer therapy, and the development of bioinks. The introduced supramolecular systems include multilayer coating by polyelectrolytes, polymers incorporated with nanoparticles, coating simulation of ECM, and drug delivery systems. A perspective on the application of supramolecular systems is also included.

Navigating Breast Cancer Innovation in Uganda: Within and Without the Textbook.

The Center for Bioengineering Innovation and Design (CBID) at Johns Hopkins University (JHU) has established a comprehensive approach to addressing global health challenges. Central to CBID's modality on global health is a strategy that integrates education, research, and collaboration. Through its graduate program, CBID trains the next generation of health care innovators to address the specific needs of low- and middle-income countries (LMICs). Graduate student teams at CBID begin their year with a focus on a health care thematic area associated with a target country.

Innovations in bio-engineering and cell-based approaches to address immunological challenges in islet transplantation.

Human allogeneic pancreatic islet transplantation is a life-changing treatment for patients with severe Type 1 Diabetes (T1D) who suffer from hypoglycemia unawareness and high risk of severe hypoglycemia. However, intensive immunosuppression is required to prevent immune rejection of the graft, that may in turn lead to undesirable side effects such as toxicity to the islet cells, kidney toxicity, occurrence of opportunistic infections, and malignancies. The shortage of cadaveric human islet donors further limits islet transplantation as a treatment option for widespread adoption. Alternatively, porcine islets have been considered as another source of insulin-secreting cells for transplantation in T1D patients, though xeno-transplants raise concerns over the risk of endogenous retrovirus transmission and immunological incompatibility. As a result, technological advancements have been made to protect transplanted islets from immune rejection and inflammation, ideally in the absence of chronic immunosuppression, to improve the outcomes and accessibility of allogeneic islet cell replacement therapies. These include the use of microencapsulation or macroencapsulation devices designed to provide an immunoprotective environment using a cell-impermeable layer, preventing immune cell attack of the transplanted cells. Other up and coming advancements are based on the use of stem cells as the starting source material for generating islet cells 'on-demand'. These starting stem cell sources include human induced pluripotent stem cells (hiPSCs) that have been genetically engineered to avoid the host immune response, curated HLA-selected donor hiPSCs that can be matched with recipients within a given population, and multipotent stem cells with natural immune privilege properties. These strategies are developed to provide an immune-evasive cell resource for allogeneic cell therapy. This review will summarize the immunological challenges facing islet transplantation and highlight recent bio-engineering and cell-based approaches aimed at avoiding immune rejection, to improve the accessibility of islet cell therapy and enhance treatment outcomes. Better understanding of the different approaches and their limitations can guide future research endeavors towards developing more comprehensive and targeted strategies for creating a more tolerogenic microenvironment, and improve the effectiveness and sustainability of islet transplantation to benefit more patients.

Medical Microrobots.

Scientists around the world have long aimed to produce miniature robots that can be controlled inside the human body to aid doctors in identifying and treating diseases. Such microrobots hold the potential to access hard-to-reach areas of the body through the natural lumina. Wireless access has the potential to overcome drawbacks of systemic therapy, as well as to enable completely new minimally invasive procedures. The aim of this review is fourfold: first, to provide a collection of valuable anatomical and physiological information on the target working environments together with engineering tools for the design of medical microrobots; second, to provide a comprehensive updated survey of the technological state of the art in relevant classes of medical microrobots; third, to analyze currently available tracking and closed-loop control strategies compatible with the in-body environment; and fourth, to explore the challenges still in place, to steer and inspire future research.

Bioengineering of vascularized porcine flaps using perfusion-recellularization.

Large volume soft tissue defects greatly impact patient quality of life and function while suitable repair options remain a challenge in reconstructive surgery. Engineered flaps could represent a clinically translatable option that may circumvent issues related to donor site morbidity and tissue availability. Herein, we describe the regeneration of vascularized porcine flaps, specifically of the omentum and tensor fascia lata (TFL) flaps, using a tissue engineering perfusion-decellularization and recellularization approach. Flaps were decellularized using a low concentration sodium dodecyl sulfate (SDS) detergent perfusion to generate an acellular scaffold with retained extracellular matrix (ECM) components while removing underlying cellular and nuclear contents. A perfusion-recellularization strategy allowed for seeding of acellular flaps with a co-culture of human umbilical vein endothelial cell (HUVEC) and mesenchymal stromal cells (MSC) onto the decellularized omentum and TFL flaps. Our recellularization technique demonstrated evidence of intravascular cell attachment, as well as markers of endothelial and mesenchymal phenotype. Altogether, our findings support the potential of using bioengineered porcine flaps as a novel, clinically-translatable strategy for future application in reconstructive surgery.

Recent advances in peptide-based bioactive hydrogels for nerve repair and regeneration: from material design to fabrication, functional tailoring and applications.

The injury of both central and peripheral nervous systems can result in neurological disorders and severe nervous diseases, which has been one of the challenges in the medical field. The use of peptide-based hydrogels for nerve repair and regeneration (NRR) provides a promising way for treating these problems, but the effects of the functions of peptide hydrogels on the NRR efficiency have been not understood clearly. In this review, we present recent advances in the material design, matrix fabrication, functional tailoring, and NRR applications of three types of peptide-based hydrogels, including pure peptide hydrogels, other component-functionalized peptide hydrogels, and peptide-modified polymer hydrogels. The case studies on the utilization of various peptide-based hydrogels for NRR are introduced and analyzed, in which the effects and mechanisms of the functions of hydrogels on NRR are illustrated specifically. In addition, the fabrication of medical NRR scaffolds and devices for pre-clinical application is demonstrated. Finally, we provide potential directions on the development of this promising topic. This comprehensive review could be valuable for readers to know the design and synthesis strategies of bioactive peptide hydrogels, as well as their functional tailoring, in order to promote their practical applications in tissue engineering, biomedical engineering, and materials science.

Current Advances in Photodynamic Therapy (PDT) and the Future Potential of PDT-Combinatorial Cancer Therapies.

Photodynamic therapy (PDT) is a two-stage treatment that implies the use of light energy, oxygen, and light-activated compounds (photosensitizers) to elicit cancerous and precancerous cell death after light activation (phototoxicity). The biophysical, bioengineering aspects and its combinations with other strategies are highlighted in this review, both conceptually and as they are currently applied clinically. We further explore the recent advancements of PDT with the use of nanotechnology, including quantum dots as innovative photosensitizers or energy donors as well as the combination of PDT with radiotherapy and immunotherapy as future promising cancer treatments. Finally, we emphasize the potential significance of organoids as physiologically relevant models for PDT.

Las normas técnicas para la formación en ingeniería biomédica, tecnología y administración en salud / Technical standards for the training in biomedical engineering, health technology and health management

Introducción: Los documentos normativos establecen el estado del arte relacionado con determinado campo del conocimiento. Existe una gran cantidad de normas relacionadas con los servicios de salud y su gestión, cuya aplicación es relevante en este sector. Objetivo: Exponer la importancia de las normas técnicas en la formación de los profesionales en ingeniería biomédica, tecnología y administración en salud. Desarrollo: Diferentes aspectos relacionados con el desempeño y las funciones de los profesionales en ingeniería biomédica, tecnología de la salud y administración en salud están recogidos en normas técnicas internacionales y en otras de carácter nacional, que resultan pertinentes y de gran utilidad para su formación en el nivel de grado y el posgrado. Conclusiones: Las profesiones abordadas requieren emplear los documentos normativos relacionados con sus funciones para contribuir con la calidad de los servicios de salud; de ahí la pertinencia de su incorporación en los planes de estudio de estas carreras(AU)

Introduction: Normative documents establish the state of the art related to a certain field of knowledge. There is a large number of standards related to health services and their management, whose application is relevant in this sector. Objective: To show the importance of technical standards in the training of professionals from the fields of biomedical engineering, health technology and health management. Development: Different aspects related to the performance and functions of professionals from the fields of biomedical engineering, health technology and health management are gathered in international and other national technical standards, relevant and useful for their training at the undergraduate and postgraduate levels. Conclusions: The addressed professions require the use of normative documents related to their functions in order to contribute to the quality of health services, hence the relevance of their incorporation into the curriculums of these major(AU)

Las normas técnicas para la formación en ingeniería biomédica, tecnología y administración en salud / Technical standards for the training in biomedical engineering, health technology and health management

Introducción: Los documentos normativos establecen el estado del arte relacionado con determinado campo del conocimiento. Existe una gran cantidad de normas relacionadas con los servicios de salud y su gestión, cuya aplicación es relevante en este sector. Objetivo: Exponer la importancia de las normas técnicas en la formación de los profesionales en ingeniería biomédica, tecnología y administración en salud. Desarrollo: Diferentes aspectos relacionados con el desempeño y las funciones de los profesionales en ingeniería biomédica, tecnología de la salud y administración en salud están recogidos en normas técnicas internacionales y en otras de carácter nacional, que resultan pertinentes y de gran utilidad para su formación en el nivel de grado y el posgrado. Conclusiones: Las profesiones abordadas requieren emplear los documentos normativos relacionados con sus funciones para contribuir con la calidad de los servicios de salud; de ahí la pertinencia de su incorporación en los planes de estudio de estas carreras(AU)

Introduction: Normative documents establish the state of the art related to a certain field of knowledge. There is a large number of standards related to health services and their management, whose application is relevant in this sector. Objective: To show the importance of technical standards in the training of professionals from the fields of biomedical engineering, health technology and health management. Development: Different aspects related to the performance and functions of professionals from the fields of biomedical engineering, health technology and health management are gathered in international and other national technical standards, relevant and useful for their training at the undergraduate and postgraduate levels. Conclusions: The addressed professions require the use of normative documents related to their functions in order to contribute to the quality of health services, hence the relevance of their incorporation into the curriculums of these major(AU)

Calidad de las imágenes, la lectura y el servicio de mamografía en cuatro centros de imagenología de Manizales, Colombia / Image quality, reading, and mammography service in four diagnostic imaging centers in Manizales, Colombia

Resumen | Introducción. La calidad de la mamografía está directamente relacionada con la capacidad para detectar anormalidades y, por ello, es necesario el control de calidad en los centros de imágenes diagnósticas. Objetivo. Evaluar la calidad de la imagen, la lectura y el servicio de mamografía de algunos centros de imágenes diagnósticas en Manizales, Colombia. Materiales y métodos. Cuatro centros participaron de forma voluntaria y bajo acuerdos de confidencialidad en el estudio. De las 520 mujeres atendidas en ellos, a 318 se les hicieron mamografías. A partir de una inspección visual del servicio, se evaluaron la infraestructura, la tecnología y el personal de la unidad. Un radiólogo experto en lectura e interpretación clínica de imágenes mamarias evaluó la calidad de la imagen y la de su lectura. El análisis estadístico se hizo utilizando un anova y determinando el índice kappa y el porcentaje de desacuerdo. Resultados. Se encontró falta de calidad de las imágenes obtenidas, principalmente, por presencia de artificios en el 75 % de ellas, e identificación y rotulación deficientes; además, en la toma de la proyección oblicua medio-lateral, se encontró falta de visualización del ángulo inframamario. El grado de concordancia en el reporte BI-RADS fue bajo en los cuatro centros, con diferencias importantes en el informe y la descripción de los hallazgos. Conclusión. Los centros de imágenes diagnósticas evaluados están habilitados para el funcionamiento, pero se encontraron deficiencias importantes en la calidad de las imágenes y en su lectura, lo que pone de manifiesto la necesidad de establecer estándares de calidad y mejorar los aspectos que se puedan mejorar.

Abstract | Introduction: Mammography quality is directly related to the ability to detect an abnormality and, therefore, quality control is necessary for diagnostic imaging centers. Objective: To evaluate image quality, reading, and mammography service in some diagnostic imaging centers in Manizales, Colombia. Materials and methods: Four diagnostic imaging centers participated voluntarily in the study under confidentiality agreements. Out of 520 women attending the centers, 318 had a mammography. The infrastructure, technology, and human resources of each unit were evaluated based on visual inspections. A radiologist expert in reading and clinical interpretation of mammary images evaluated the quality of the image and the reading. We made the statistical analysis using anova, the kappa index, and the percentage of disagreement. Results: We found images of diminished quality mainly due to the presence of artifacts in 75 % of those evaluated, as well as non-compliance with identification criteria and image labeling. There were difficulties in taking the lateral median oblique projection given the absence of the inframammary. The level of agreement in the BI-RADS reporting was low in the four centers with important differences in the report and description of findings. Conclusion: The city's diagnostic centers under evaluation are authorized for their operation. However, there are important deficiencies in image quality and reading, which highlights the need to seek quality standards starting from those aspects that can be improved upon.

Avaliação de indicadores de desempenho da área de engenharia clínica: uma proposta para um hospital público universitário / Evaluation of clinical engineering performance indicators: a proposal for a university public hospita

RESUMO Objetivo: Propor um conjunto de indicadores de desempenho para o Departamento de Engenharia Clínica (EC) de um hospital público universitário. Metodologia: Após pesquisa bibliográfica dos indicadores da área de engenharia clínica citados na literatura, foi elaborado um questionário aplicado a gestores de hospitais de alta complexidade, docentes e especialistas para avaliar a pertinência, credibilidade do resultado, esforço de apuração, simplicidade de interpretação e de algoritmo de cálculo dos indicadores. Resultados:Foram propostos 14 indicadores para o departamento de EC: percentual de conclusão do programa de manutenção preventiva, tempo médio de atendimento, tempo médio de paralisação de máquina, número de reparos repetidos, percentual do total de ordens de serviço concluídas, número de ordens de serviço por área, percentual de reparos realizados externamente, percentual de reparos realizados por erro do usuário, custo de manutenção versus custo de aquisição, custo total de manutenção, satisfação do funcionário, treinamento da equipe técnica, satisfação do cliente e treinamento de usuários. Conclusões: Numa instituição pública de grande porte e nível terciário, a escolha dos indicadores para compor um painel para a gestão do Departamento de EC, bem como a apuração dos resultados deve ser ponderada, tendo em vista que, instituições governamentais sofrem impactos diretos quanto à disponibilidade de verba e entraves burocráticos que, muitas vezes, geram impasses difíceis de serem solucionados. É importante que exista um trabalho de conscientização dos funcionários quanto ao seu papel nos resultados dos indicadores e na busca das metas estabelecidas pela organização, pois, somente esse conjunto vai permitir uma gestão de sucesso (AU)

Objective: To propose a set of performance indicators for the Clinical Engineering Department (CE) of a public university hospital. Methodology: After a bibliographic search of clinical engineering indicators cited in the literature, a questionnaire was applied to hospital managers of high complexity, professors and specialists to evaluate the relevance, credibility of the result, calculation effort, sim-plicity of interpretation and calculation algorithm of indicators. Results: 14 indicators were proposed to the CE Department: percentage of completion of the preventive maintenance program, average service time, average machine downtime, number of repeated repairs, percentage of total work or-ders completed, number of service orders by area, percentage of repairs performed externally, per-centage of repairs performed by user error, maintenance cost versus cost of acquisition, total cost of maintenance, employee satisfaction, technical team training, customer satisfaction and user training. Conclusions: In a large public institution and tertiary level, the choice of the indicators to compose a panel of indicators for the management of the CE Department, as well as the calculation of the results, should be considered, since State institutions suffer direct impacts on the availability of funds and bu-reaucratic obstacles that often generate impasses that are difficult to solve. It is important that there is a work of awareness of the employees about their role in the results of the indicators and the search of the goals established by the organization since only this set will allow successful management (AU)