Head-compliant microstrip split ring resonator for non-invasive healing monitoring after craniosynostosis-based surgery

• A soft and highly directive, proximity-coupled split-ring resonator fabricated with a liquid alloy, copper and polydimethylsiloxane (PDMS) is presented. The same was designed for sensing osteogenesis of calvarial bone. As dielectric properties of bone grafts in ossifying calvarial defects should change during the osteogenesis process, devices like this could monitor the gradual transformation of the defect into bone by differentiating changes in the dielectric properties as shifts in the resonance frequency. Computational Software Technology (CST) Microwave Studio (R)-based simulation results on computational head models were in good agreement with laboratory results on head phantom models, which also included the comparison with an in-vivo measurement on the human head. A discussion based on an inductive reasoning regarding dynamics' considerations is provided as well. Since the skin elasticity of newborn children is high, stretching and crumpling could be significant. In addition, due to typical head curvatures in newborn children, bending should not be a significant issue, and can provide higher energy focus in the defect area and improve conformability. The present concept could support the development of soft, cheap and portable follow-up monitoring systems to use in outpatient hospital and home care settings for post-operative monitoring of bone healing after reconstructive surgical procedures.

Ämnesord

MEDICIN OCH HÄLSOVETENSKAP  -- Klinisk medicin -- Ortopedi (hsv//swe)

MEDICAL AND HEALTH SCIENCES  -- Clinical Medicine -- Orthopaedics (hsv//eng)

TEKNIK OCH TEKNOLOGIER  -- Medicinteknik -- Medicinsk material- och protesteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Medical Engineering -- Medical Materials (hsv//eng)

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik -- Annan elektroteknik och elektronik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering -- Other Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)

Nyckelord

bone

phantoms

surgery

skin

elasticity

bending

biomechanics

paediatrics

split ring resonators

microstrip resonators

patient monitoring

liquid alloys

microwave resonators

biomedical equipment

bone grafts

calvarial defects

osteogenesis process

dielectric properties

resonance frequency

computational head models

head phantom models

human head

newborn children

defect area

monitoring systems

post-operative monitoring

bone healing

head-compliant microstrip split ring resonator

noninvasive healing monitoring

craniosynostosis-based surgery

soft proximity-coupled split-ring resonator

highly directive proximity-coupled split-ring resonator

copper

polydimethylsiloxane

liquid alloy

calvarial bone osteogenesis

computational software technology microwave studio-based simulation

head curvatures

skin elasticity

reconstructive surgical procedures

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