applications myograph blood pressure measurement contractile force of cardiac muscles walking / gait...
TRANSCRIPT
Applications
• Myograph• Blood pressure measurement• Contractile force of cardiac muscles• Walking / Gait analysis• Catheter – type transducers– Blood pressure
Myograph
• Force of contracting muscles attached strain gauge change in resistance Wheatstone bridge change in voltage
• Strain gauge resistance myograph
Contractile force of cardiac muscles
• Strain Gauge reistance myograph on excised papillary muscle
• Strain Gauge Arch sutured to wall of left / right ventricle
• In situ means of continuous recording of force developed by cardiac muscle
• Encapsulated version of S.G permanently implanted on animals
Cardiac strain gauge
• Can measure prestress of cardiac muscles• To investigate diastolic loading (preload)• To study the effect of increased stretch to
increase the force of contraction (Sterling’s law of heart)
Walking / Gait analysis• Miniature strain gauges bonded directly on the
bones• To measure strain in the bone during walking• Requirements– Careful preparation of bone surface – Special adhesives and coverings– Water proof the lead and S.G– Careful dressing of leads
• Leads brought to skin surface through surgically prepared tunnel