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Flashcards in Evolution Deck (17):
1

Evolution of ICS

Implantable Cochlear Stimulators

1.0
1.2
CII Bionic Ear
HiRes 90K
HiRes 90K Advantage

2

ICS Components

Casing/Receiver package
Output circuits
Capacitors
Magnet
Custom Chip
Bi-Directional Telemetry
Electrode array

3

ICS Casing/Receiver Package

Properties of casing

Materials must be biocompatible (not harmful to the body)

Must be hermetically sealed to prevent internal electronic damage (from body fluids)

2 available materials: ceramic and titanium

4

ICS Casing

Ceramic vs. Titanium

Ceramic
Good transmission properties
Highly durable, but placement can pose increased risk to case fractures upon direct impact
More drilling required
Antennae and electronics housed within single unit

Titanium
Poor transmission- antenna outside of casing
Due to design change- less drilling required
Smaller in depth

5

ICS Casing

Which ICS are encased in ceramics?
Which ICS are encased in titanium?

Ceramic
1.0
1.2
CII

Titanium
HiRes 90K

6

All about output circuits

Current sources

Key feature of our system, allowing for significant flexibility in sound processing
- Allows the capability to stimulate sequentially, partially simultaneously, or fully simultaneously

7

Output circuits

AB vs. Competitors

C-1: 8 independent output circuits
CII and HiRes 90K: 16 independent output circuits

Cochlear: 1 output circuit (slower and only sequential patterns of stimulation)
Med-El: multiple output circuits (12) but their system employs low transmission rates which doesn't allow them to stimulate simultaneously

8

Capacitor and why we need them

Electrical component that holds charge.

Provide protection against leakage of harmful DC current which can damage neural tissue

Capacitor holds any excess charge (+ or -) to ensure that a balanced pulse is delivered to the nerve

Control current leakage and prevent current buildup

9

Capacitors

AB vs. Competitors

AB
C1 ICS has 8 capacitors
CII and HiRes90K have 16 capacitors

Cochlear
Use shorting mechanism

Med-El
Capacitors

10

Magnet location

On the center of the substrate (circuit board) with 1.0, 1.2, and CII
Embedded in silicone portion of HiRes 90K, allowing magnet to be removed for MRI application

11

Custom chip

Microchip located on substrate (circuit board)

Allows capability to sample and deliver incoming signal at fast stimulation rates

CII and HiRes 90K have internal memory: storing internally frees up bandwidth and can deliver more info to the system and increase power efficacy

12

Bi-Directional Telemetry

Capacity to send information in both directions

Monitors the communication between the internal and external hardware

Essential feature for audible alarms/LED, measuring impedances, and power management

Forward FTEL: 49 MHz
Send data and power to the implant

Back BTEL: 10.7 MHz
Info regarding status of implant
Allows system to continually monitor function
Impedance measurements

13

Electrode design

Spiral electrode

HiFicus electrode

Differ in:
Wiring of electrode contacts to the stimulus current sources
Location and shape of contacts
Curvature of electrode carrier

14

Electrode coupling

Monopolar vs. Bipolar

Electrodes stimulated in pairs with one active and one ground electrode

Monopolar
Stimulating/active electrode is intracochlear
Ground electrode extracochlear (I.e., case ground on 90K)
Able to recruit more nerve fibers to obtain adequate loudness levels with less current

Bipolar
Both stimulating/active electrode and ground electrode intracochlear
Stimulate more accurately
Recruits fewer nerve fibers which requires more current to obtain adequate loudness levels

15

Components of cochlear implant

Internal hardware
Implant
Electrode array

External hardware
Sound processor
Headpiece
Accessories

16

Sound processor evolution

Body worn
Clarion 1.0
Clarion 1.2
S-Series
Platinum Sound Processor

BTE
Platinum BTE
CII BTE
HiRes Auria
HiRes Harmony
Naída CI Q70

Freestyle
Neptune

Naída CI Q90

17

Sound processing evolution

CIS
CA
SAS
MPS
HiRes
Fidelity 120
ClearVoice
HiRes Optima