Bi- ventricular programmable pulse generator
The pacemakers can be programmed with the range of values of the parameters that are detailed in Table 1.
Besides the information concerning the programmable parameters, it is also possible to obtain telemetry data about identification, battery status, statistics and marker pulses (see Table 2).
The BI-VENT pacemakers are made with an hermetically sealed lithium-iodine battery (WG 8950 battery with an initial voltage of 2.8 V and a capacity of 1.58 Ah). Runs for 6.3 years at70 ppm for Atrium – 2.5V, 0.4ms, Right ventricle – 5 v , 0.4 ms & Left ventricle – 5 v, 0.4 ms for the channels 100% pacing.
For better protection of the components from organic fluids, the electronic circuit and the battery are perfectly isolated into an hermetic titanium can.
The BI- VENT size is 51 x 47 x 8,0 mm and its mass is 37 gm.
The connectors are made of stainless steel 316. The leads are fixed using screws that are adjusted with an Allen hex key. This key is included in the pacemaker blister.
In the next section, the features of the CHARAK DDD are described. In table 3, a list of these features is shown.
|MAGNETIC RESPONSE||Asynchronic mode
At BOL and OK: The period is 665 ms.
At ERI: The period is 705 ms.
AT EOL : The period is 1041 ms
|BATTERY CHEMISTRY||Lithium-Iodine WG 8950.
Initial voltage: 2.8 V.
Capacity: 1.58 Ah.
|ELECTIVE (ERI):||Battery remaining capacity between 4 and 8% of the total.
When a magnet is applied, the period is incremented in 40 ms.
|END OF LIFE (EOL):||Battery remaining capacity under 4% of the total.
When a magnet is applied, the period is incremented in 335 ms.
|PROTECTIONS||When the pacemaker senses events with a rate exceeding 11 Hz:
a) if the programmed mode is DDD, DDI, or VDD, in presence of ventricular interference, it switches to VOO mode; in presence of Atrial interference, it switches to VVI mode.
b) if it is in a single chamber mode, it switches to an asynchronic mode.