Multichannel Vestibular Prosthesis
Active In SP
Joined: Sep 2010
12-01-2011, 03:48 PM
Multichannel Vestibular Prosthesis.ppt (Size: 1.15 MB / Downloads: 67)
By Anu Jimmy
A device, which is being designed by JOHNS HOPKINS SCHOOL OF MEDICINE,BALTIMORE,USA.
A neuro-electronic prosthesis for sensing head rotation in 3D & delivers stimuli
1.pulse frequency modulated,
3.constant current stimuli.
upto eight electrodes & stimulates ampullary branches of vestibular nerve.
Head mounted, semi-implantable prosthesis
To restore AVOR:-gaze restoring mechanism
Anatomy of Inner Ear
3 Semi-circular canals(SCC):-fluid acts as inertial load for detection of component abt the axis perpendicular to its planes.
Utricle & Saccule- transduces translational acceleration
Fluid movement distorts CUPULA->shear stresses bending stereocilia->modulating neurotransmitter releases from hair cells->modulating firing rates of afferent nerves synapsing with hair cells.
6 SCC’s->3 pairs-RALP pair, LARP pair & HORIZONTAL pair
Causes of damage to vestibular sensation
Vestibular hair cells are injured due to
1. Ménière's disease
3.Surgical trauma during cochlear implantation
6 IMPORTANT Components
Current Source & switching
Intensity of pulse-charge withdrawn or injected the surrounding tissue
To control charge- we may control pulse current or duration or both.
Total injected current must be within the “safe stimulation range” for a given electrode.
Current should not exceeed the ratio of stimulator’s compliance voltage to electrode impedance.
|Possibly Related Threads...|
|Multichannel code lock system||seminar ideas||0||706||
18-06-2012, 04:21 PM
Last Post: seminar ideas
|Implementation of Multichannel Sensors for Remote Biomedical Measurements||smart paper boy||0||708||
29-07-2011, 10:34 AM
Last Post: smart paper boy
|Design of various demonstration modes excited by a prosthesis||project topics||0||458||
26-04-2011, 02:52 PM
Last Post: project topics
|The Coding of Sound by a Cochlear Prosthesis||seminar surveyer||0||485||
25-09-2010, 03:41 PM
Last Post: seminar surveyer
|Centrally Controlled Multichannel Token Display||seminar projects crazy||0||1,701||
14-08-2009, 03:38 PM
Last Post: seminar projects crazy