Evaluation of electrical impedance of Pt–Ir epimysial electrodes under implantation in muscles

Muñoz, Robert; Leija, L.; Álvarez, Jesús; Reyes, José L.; Flores, Joel; Hedz, Pablo-Ro.; Minor, A.; Sierra, Gerardo

doi:10.1016/s0924-4247(02)00199-1

Cited by 4 publications

(3 citation statements)

References 15 publications

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Section: Resultssupporting

confidence: 65%

“…This may have happened due to electrochemical corrosion or damage of the coating during surgery. Stopping of the fibrous capsule growth for a long implantation period (more than 200 days) was also shown earlier for PtIr wire electrodes by the impedance measuring [62]. In general, histological differences in the structure of FC samples of the Ti-alloy implants and those coated with noble metals may have been the result of two different engraftment processes.…”

Section: Average Thickness Of the Fibrous Capsulesupporting

confidence: 63%

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Noble Metals for Modern Implant Materials: MOCVD of Film Structures and Cytotoxical, Antibacterial, and Histological Studies

et al. 2021

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This work is aimed at developing the modification of the surface of medical implants with film materials based on noble metals in order to improve their biological characteristics. Gas-phase transportation methods were proposed to obtain such materials. To determine the effect of the material of the bottom layer of heterometallic structures, Ir, Pt, and PtIr coatings with a thickness of 1.4–1.5 μm were deposited by metal–organic chemical vapor deposition (MOCVD) on Ti6Al4V alloy discs. Two types of antibacterial components, namely, gold nanoparticles (AuNPs) and discontinuous Ag coatings, were deposited on the surface of these coatings. AuNPs (11–14 nm) were deposited by a pulsed MOCVD method, while Ag films (35–40 nm in thickness) were obtained by physical vapor deposition (PVD). The cytotoxic (24 h and 48 h, toward peripheral blood mononuclear cells (PBMCs)) and antibacterial (24 h) properties of monophase (Ag, Ir, Pt, and PtIr) and heterophase (Ag/Pt, Ag/Ir, Ag/PtIr, Au/Pt, Au/Ir, and Au/PtIr) film materials deposited on Ti-alloy samples were studied in vitro and compared with those of uncoated Ti-alloy samples. Studies of the cytokine production by PBMCs in response to incubation of the samples for 24 and 48 h and histological studies at 1 and 3 months after subcutaneous implantation in rats were also performed. Despite the comparable thickness of the fibrous capsule after 3 months, a faster completion of the active phase of encapsulation was observed for the coated implants compared to the Ti alloy analogs. For the Ag-containing samples, growth inhibition of S. epidermidis, S. aureus, Str. pyogenes, P. aeruginosa, and Ent. faecium was observed.

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Section: Resultssupporting

confidence: 65%

Section: Average Thickness Of the Fibrous Capsulesupporting

confidence: 63%

Noble Metals for Modern Implant Materials: MOCVD of Film Structures and Cytotoxical, Antibacterial, and Histological Studies

et al. 2021

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“…Usually, chronic recording using sEMG requires frequent calibrations to ensure recorded data consistency. The electrolyte and bio-fluid produced by perspiration accumulated under the recording sites will change the skin-electrode interface’s impedance, thus influencing the signal characteristics ( Muñoz et al, 2002 ; Hargrove et al, 2007 ). This variation might bring problems when decoding sEMG into MUAPTs.…”

Section: Bioelectrical Sensing Interfacesmentioning

confidence: 99%

Wearable super-resolution muscle–machine interfacing

et al. 2022

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Muscles are the actuators of all human actions, from daily work and life to communication and expression of emotions. Myography records the signals from muscle activities as an interface between machine hardware and human wetware, granting direct and natural control of our electronic peripherals. Regardless of the significant progression as of late, the conventional myographic sensors are still incapable of achieving the desired high-resolution and non-invasive recording. This paper presents a critical review of state-of-the-art wearable sensing technologies that measure deeper muscle activity with high spatial resolution, so-called super-resolution. This paper classifies these myographic sensors according to the different signal types (i.e., biomechanical, biochemical, and bioelectrical) they record during measuring muscle activity. By describing the characteristics and current developments with advantages and limitations of each myographic sensor, their capabilities are investigated as a super-resolution myography technique, including: (i) non-invasive and high-density designs of the sensing units and their vulnerability to interferences, (ii) limit-of-detection to register the activity of deep muscles. Finally, this paper concludes with new opportunities in this fast-growing super-resolution myography field and proposes promising future research directions. These advances will enable next-generation muscle-machine interfaces to meet the practical design needs in real-life for healthcare technologies, assistive/rehabilitation robotics, and human augmentation with extended reality.

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Development of an electronic equipment for the pre medical diagnose in the progress of diabetic foot disease

Gutierrez

Ramos-Becerril

Leija

et al. 2014

2014 International Conference on Control, Decision and Information Technologies (CoDIT)

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Evaluation of electrical impedance of Pt–Ir epimysial electrodes under implantation in muscles

Cited by 4 publications

References 15 publications

Noble Metals for Modern Implant Materials: MOCVD of Film Structures and Cytotoxical, Antibacterial, and Histological Studies

Noble Metals for Modern Implant Materials: MOCVD of Film Structures and Cytotoxical, Antibacterial, and Histological Studies

Wearable super-resolution muscle–machine interfacing

Development of an electronic equipment for the pre medical diagnose in the progress of diabetic foot disease

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