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https://www.readbyqxmd.com/read/28211911/three-dimensional-printing-of-calcium-sulfate-and-mesoporous-bioactive-glass-scaffolds-for-improving-bone-regeneration-in-vitro-and-in-vivo
#1
Xin Qi, Peng Pei, Min Zhu, Xiaoyu Du, Chen Xin, Shichang Zhao, Xiaolin Li, Yufang Zhu
In the clinic, bone defects resulting from infections, trauma, surgical resection and genetic malformations remain a significant challenge. In the field of bone tissue engineering, three-dimensional (3D) scaffolds are promising for the treatment of bone defects. In this study, calcium sulfate hydrate (CSH)/mesoporous bioactive glass (MBG) scaffolds were successfully fabricated using a 3D printing technique, which had a regular and uniform square macroporous structure, high porosity and excellent apatite mineralization ability...
February 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28210226/combination-of-collagen-based-scaffold-and-bioactive-factors-induces-adipose-derived-mesenchymal-stem-cells-chondrogenic-differentiation-in-vitro
#2
Giovanna Calabrese, Stefano Forte, Rosario Gulino, Francesco Cefalì, Elisa Figallo, Lucia Salvatorelli, Eugenia T Maniscalchi, Giuseppe Angelico, Rosalba Parenti, Massimo Gulisano, Lorenzo Memeo, Raffaella Giuffrida
Recently, multipotent mesenchymal stem cells (MSCs) have attracted much attention in the field of regenerative medicine due to their ability to give rise to different cell types, including chondrocytes. Damaged articular cartilage repair is one of the most challenging issues for regenerative medicine, due to the intrinsic limited capability of cartilage to heal because of its avascular nature. While surgical approaches like chondral autografts and allografts provide symptoms and function improvement only for a short period, MSC based stimulation therapies, like microfracture surgery or autologous matrix-induced chondrogenesis demonstrate to be more effective...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28207238/real-time-monitoring-of-post-surgical-and-post-traumatic-eye-injuries-using-multi-layered-electrical-biosensor-chip
#3
Muhammad Shuja Khan, Santosh K Misra, Aaron Schwartz-Duval, Enrique A Daza, Fatemeh Ostadhossein, Matthew Bowman, Akshay Jain, Gina Taylor, Deana McDonagh, Leanne T Labriola, Dipanjan Pan
Lack of current techniques for the early monitoring of bleb leaks and other post-traumatic or post-surgical ocular injury has posed an unmet clinical need for the development of new techniques. Present evaluation techniques use either subjective or non-quantitative approaches. At present, there are no FDA approved ocular devices that can directly measure ascorbic acid (AA) concentration levels for both tear film (TF) and aqueous humor (AH) at point-of-care (POC) level. Toward this aim, we present a novel point-of-care (POC) quantitative assay, called the Ocular Biosensor device, which can be used to evaluate the integrity of the anterior surface of the eye by measuring the concentration of AA in TF and AH...
February 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28199294/flow-induced-microvascular-network-formation-of-therapeutic-relevant-arteriovenous-av-loop-based-constructs-in-response-to-ionizing-radiation
#4
Volker J Schmidt, Jennifer M Covi, Christoph Koepple, Johannes G Hilgert, Elias Polykandriotis, Amir K Bigdeli, Luitpold V Distel, Raymund E Horch, Ulrich Kneser
BACKGROUND The arteriovenous (AV) loop model enables axial vascularization to gain a functional microcirculatory system in tissue engineering constructs in vivo. These constructs might replace surgical flaps for the treatment of complex wounds in the future. Today, free flaps are often exposed to high-dose radiation after defect coverage, according to guideline-oriented treatment plans. Vascular response of AV loop-based constructs has not been evaluated after radiation, although it is of particular importance...
February 15, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28196661/pediatric-medical-device-development-by-surgeons-via-capstone-engineering-design-programs
#5
Bryan S Sack, Rodolfo A Elizondo, Gene O Huang, Nicolette Janzen, Jimmy Espinoza, Magdalena Sanz-Cortes, Jennifer E Dietrich, Julie Hakim, Eric Richardson, Maria Oden, John Hanks, Balakrishna Haridas, James F Hury, Chester J Koh
BACKGROUND: There is a need for pediatric medical devices that accommodate the unique physiology and anatomy of pediatric patients that is increasingly receiving more attention. However, there is limited literature on the programs within children's hospitals and academia that can support pediatric device development. We describe our experience with pediatric device design utilizing collaborations between a children's hospital and two engineering schools. METHODS: Utilizing the academic year as a timeline, unmet pediatric device needs were identified by surgical faculty and matched with an engineering mentor and a team of students within the Capstone Engineering Design programs at two universities...
February 6, 2017: Journal of Pediatric Surgery
https://www.readbyqxmd.com/read/28190507/best-practices-in-early-phase-medical-device-development-engineering-prototyping-and-the-beginnings-of-a-quality-management-system
#6
Kristy Fearis, Aidan Petrie
Kristy Fearis is the founder and president of KPConsulting. She has held various positions in the medical device and research industry. She has led programs for medical industry leaders Medtronic, Edward Lifesciences, and Kimberly-Clark Healthcare to develop and commercialize Class II and III devices. Although a true quality management systems specialist at heart, Kristy has a passion for effectively and efficiently applying quality systems principles to early stage development to maximize benefit while minimizing impact on resources and time to market...
March 2017: Surgery
https://www.readbyqxmd.com/read/28188486/validation-of-a-method-for-retroperitoneal-tumor-segmentation
#7
Cristina Suárez-Mejías, José A Pérez-Carrasco, Carmen Serrano, José L López-Guerra, Tomás Gómez-Cía, Carlos L Parra-Calderón, Begoña Acha
PURPOSE: In 2005, an application for surgical planning called AYRA[Formula: see text] was designed and validated by different surgeons and engineers at the Virgen del Rocío University Hospital, Seville (Spain). However, the segmentation methods included in AYRA and in other surgical planning applications are not able to segment accurately tumors that appear in soft tissue. The aims of this paper are to offer an exhaustive validation of an accurate semiautomatic segmentation tool to delimitate retroperitoneal tumors from CT images and to aid physicians in planning both radiotherapy doses and surgery...
February 10, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28183437/cardiac-3d-printing-and-its-future-directions
#8
REVIEW
Marija Vukicevic, Bobak Mosadegh, James K Min, Stephen H Little
Three-dimensional (3D) printing is at the crossroads of printer and materials engineering, noninvasive diagnostic imaging, computer-aided design, and structural heart intervention. Cardiovascular applications of this technology development include the use of patient-specific 3D models for medical teaching, exploration of valve and vessel function, surgical and catheter-based procedural planning, and early work in designing and refining the latest innovations in percutaneous structural devices. In this review, we discuss the methods and materials being used for 3D printing today...
February 2017: JACC. Cardiovascular Imaging
https://www.readbyqxmd.com/read/28178606/breast-reconstruction-post-mastectomy-let-s-google-it-accessibility-readability-and-quality-of-online-information
#9
Noel P Lynch, Bronagh Lang, Sophia Angelov, Sarah A McGarrigle, Terence J Boyle, Dhafir Al-Azawi, Elizabeth M Connolly
INTRODUCTION: This study evaluated the readability, accessibility and quality of information pertaining to breast reconstruction post mastectomy on the Internet in the English language. METHODS: Using the Google(©) search engine the keywords "Breast reconstruction post mastectomy" were searched for. We analyzed the top 75 sites. The Flesch Reading Ease Score and Gunning Fog Index were calculated to assess readability. Web site quality was assessed objectively using the University of Michigan Consumer Health Web site Evaluation Checklist...
February 5, 2017: Breast: Official Journal of the European Society of Mastology
https://www.readbyqxmd.com/read/28174390/-surgical-regeneration-therapy-using-myoblast-sheets-for-severe-heart-failure
#10
Yoshiki Sawa
Heart failure is a life-threatening disorder worldwide, and the current end-stage therapies for severe heart failure are replacement therapies such as ventricular-assist devices and heart transplantation. Although these therapies have been reported to be useful, there are many issues in terms of the durability, complications, limited donors, adverse effect of continuous administration of immunosuppressive agents, and high costs involved. Recently, regenerative therapy based on genetic, cellular, or tissue engineering techniques has gained attention as a new therapy to overcome the challenges encountered in transplantation medicine...
January 2017: Kyobu Geka. the Japanese Journal of Thoracic Surgery
https://www.readbyqxmd.com/read/28170430/efficient-decellularization-for-tissue-engineering-of-the-tendon-bone-interface-with-preservation-of-biomechanics
#11
Kai Xu, Lara A Kuntz, Peter Foehr, Katharina Kuempel, Alexandra Wagner, Jutta Tuebel, Constantin V Deimling, Rainer H Burgkart
Interfaces between tendon/ligament and bone ("entheses") are highly specialized tissues that allow for stress transfer between mechanically dissimilar materials. Entheses show very low regenerative capacity resulting in high incidences of failure after surgical repair. Tissue engineering is a promising approach to recover functionality of entheses. Here, we established a protocol to decellularize porcine entheses as scaffolds for enthesis tissue engineering. Chemical detergents as well as physical treatments were investigated with regard to their efficiency to decellularize 2 mm thick porcine Achilles tendon entheses...
2017: PloS One
https://www.readbyqxmd.com/read/28170219/on-demand-dissolution-of-chemically-cross-linked-hydrogels
#12
Marlena D Konieczynska, Mark W Grinstaff
The formation and subsequent on-demand dissolution of chemically cross-linked hydrogels is of keen interest to chemists, engineers, and clinicians. In this Account, we summarize our recent advances in the area of dissolvable chemically cross-linked hydrogels and provide a comparative discussion of other recent hydrogel systems. Using biocompatible macromonomers, we developed a library of cross-linked dendritic hydrogels that possess favorable properties, including biocompatibility, tissue adhesion, and swelling...
February 7, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28162053/cell-and-growth-factor-loaded-keratin-hydrogels-for-treatment-of-volumetric-muscle-loss-vml-in-a-mouse-model
#13
Hannah B Baker, Juliana A Passipieri, Mevan Siriwardane, Mary Ellenburg, Manasi Vadhavkar, Christopher R Bergman, Justin M Saul, Seth Tomblyn, Luke Burnett, George Joseph Christ
Wounds to the head, neck and extremities have been estimated to account for ~84% of reported combat injuries to military personnel. Volumetric muscle loss (VML), defined as skeletal muscle injuries in which tissue loss results in permanent functional impairment, are common among these injuries. The present standard of care entails the use of muscle flap transfers, which suffer from the need for additional surgery when using autografts or the risk of rejection when cadaveric grafts are used. Tissue engineering (TE) strategies for skeletal muscle repair have been investigated as a means to overcome current therapeutic limitations...
February 4, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/28159720/biphasic-calcium-phosphate-ceramics-for-bone-reconstruction-a-review-of-biological-response
#14
REVIEW
J M Bouler, P Pilet, O Gauthier, E Verron
: Autologous bone graft is considered as the gold standard in bone reconstructive surgery. However, the quantity of bone available is limited and the harvesting procedure requires a second surgical site resulting in severe complications. Due to these limits, scientists and clinicians have considered alternatives to autologous bone graft. Calcium phosphates (CaPs) biomaterials including biphasic calcium phoshate (BCP) ceramics have proven efficacy in numerous clinical indications. Their specific physico-chemical properties (HA/TCP ratio, dual porosity and subsequent interconnected architecture) control (regulate/condition) the progressive resorption and the bone substitution process...
January 31, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28155051/a-review-on-animal-models-and-treatments-for-the-reconstruction-of-achilles-and-flexor-tendons
#15
Marta Bottagisio, Arianna B Lovati
Tendon is a connective tissue mainly composed of collagen fibers with peculiar mechanical properties essential to functional movements. The increasing incidence of tendon traumatic injuries and ruptures-associated or not with the loss of tissue-falls on the growing interest in the field of tissue engineering and regenerative medicine. The use of animal models is mandatory to deepen the knowledge of the tendon healing response to severe damages or acute transections. Thus, the selection of preclinical models is crucial to ensure a successful translation of effective and safe innovative treatments to the clinical practice...
March 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28149624/an-engineering-perspective-on-3d-printed-personalized-scaffolds-for-tracheal-suspension-technique
#16
COMMENT
Jia An, Chee Kai Chua
3D printing is a large family of many distinct technologies covering a wide range of topics. From an engineering point of view, there should be considerations for selection of design, material, and process when using 3D printing for surgical technique innovation such as personalized scaffolds. Moreover, cost should also be considered if there are equally effective alternatives to the innovation. Furthermore, engineering considerations and options should be clearly communicated and readily available to surgeons for advancement in future...
December 2016: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28149571/surgical-technique-establishing-a-pre-clinical-large-animal-model-to-test-aortic-valve-leaflet-substitute
#17
Martin Schweiger, Walter Knirsch, Niko Cesarovic, Bernard Krüger, Martin Schmiady, Thomas Frauenfelder, Laura Frese, Hitendu Dave, Simon Philipp Hoerstrup, Michael Hübler
To overcome current limitations of valve substitutes and tissue substitutes the technology of tissue engineering (TE) continues to offer new perspectives in congenital cardiac surgery. We report our experiences and results implanting a decellularized TE patch in nine sheep in orthotropic position as aortic valve leaflet substitute. Establishing the animal model, feasibility, cardiopulmonary bypass issues and operative technique are highlighted.
December 2016: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28148846/tumor-homing-cytotoxic-human-induced-neural-stem-cells-for-cancer-therapy
#18
Juli R Bagó, Onyi Okolie, Raluca Dumitru, Matthew G Ewend, Joel S Parker, Ryan Vander Werff, T Michael Underhill, Ralf S Schmid, C Ryan Miller, Shawn D Hingtgen
Engineered neural stem cells (NSCs) are a promising approach to treating glioblastoma (GBM). The ideal NSC drug carrier for clinical use should be easily isolated and autologous to avoid immune rejection. We transdifferentiated (TD) human fibroblasts into tumor-homing early-stage induced NSCs (h-iNSC(TE)), engineered them to express optical reporters and different therapeutic gene products, and assessed the tumor-homing migration and therapeutic efficacy of cytotoxic h-iNSC(TE) in patient-derived GBM models of surgical and nonsurgical disease...
February 1, 2017: Science Translational Medicine
https://www.readbyqxmd.com/read/28142354/the-use-of-three-dimensional-printing-technology-in-orthopaedic-surgery
#19
Tak Man Wong, Jimmy Jin, Tak Wing Lau, Christian Fang, Chun Hoi Yan, Kelvin Yeung, Michael To, Frankie Leung
Three-dimensional (3-D) printing or additive manufacturing, an advanced technology that 3-D physical models are created, has been wildly applied in medical industries, including cardiothoracic surgery, cranio-maxillo-facial surgery and orthopaedic surgery. The physical models made by 3-D printing technology give surgeons a realistic impression of complex structures, allowing surgical planning and simulation before operations. In orthopaedic surgery, this technique is mainly applied in surgical planning especially revision and reconstructive surgeries, making patient-specific instruments or implants, and bone tissue engineering...
January 2017: Journal of Orthopaedic Surgery
https://www.readbyqxmd.com/read/28139532/cartilage-tissue-engineering-role-of-mesenchymal-stem-cells-along-with-growth-factors-scaffolds
#20
REVIEW
M B Gugjoo, G T Sharma, H P Aithal, P Kinjavdekar
Articular cartilage injury poses a major challenge for both the patient and orthopaedician. Articular cartilage defects once formed do not regenerate spontaneously, rather replaced by fibrocartilage which is weaker in mechanical competence than the normal hyaline cartilage. Mesenchymal stem cells (MSCs) along with different growth factors and scaffolds are currently incorporated in tissue engineering to overcome the deficiencies associated with currently available surgical methods and to facilitate cartilage healing...
September 2016: Indian Journal of Medical Research
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