Core-Lith Model 221

	Pheonix SSI Model 791
	Pheonix SSIR Model 792
	Pheonix -M Model 793
	Pheonix -AM Model 105/205
	Core-Lith Model
	Ventralith-I
	Core-Pace Model BT 01
	Parmanent Lead
	Temporary Lead
	Bipolar Lead - 7 F Lead

PRODUCTS

Core-Lith Model 221 Dual Chamber Pacemaker

Specifications

Core-Lith 221 is a bicameral, programmable pulse generator The pacemakers can be programmed with the range of values of the parameters that are detailed below.

Programmable Parameter Values

Pacing Modes	DDD, DDI, DOO, VDD, VVI, VVT, VOO, AAI, AAT, AOO, ODO.
Basic Pacing Rates	From 30 to 120 ppm
Maximum Rates	From 60 to 147 ppm.
Post Pacing AV Delays	From 63 to 281 ms, in steps of 15.625 ms.
Post Sensing AV Delays	From 53 to 272 ms, in steps of 15.625 ms. (3 values depending on rate).
Rates of Change of the Post Sensing AV Delay	From 60 to 147 ppm.
Blanking	From 21 to 68 ms, in steps of 15.625 ms.
Atrial and Ventricular Pulse Amplitudes	2.5, 5.0 Volts.
Atrial and Ventricular Pulse Widths	From 0.122 to 1.464 ms in steps of 0.122 ms.
Atrial and Ventricular Refractory Periods	From 195 to 430 ms, in steps of 15.625 ms.
Refractory Period Post Premature Ventricular Event	From 195 to 430 ms, in steps of 15.625 ms, or VA period
Atrial Sensitivities	0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0.
Ventricular Sensitivities	1.0, 1.8, 2.6, 3.4, 4.2, 5.0, 5.8, 6.6.
Upper Rate Behavior	Off, Wenckebach, 2:1 block.
Atrial Pacing Polarity	Unipolar - Bipolar
Ventricular Pacing Polarity	Unipolar - Bipolar.
Sensing Polarity	Unipolar - Bipolar.
Coupled Pacing Delay	OFF, 395 ms, 410 ms, 426 ms.
Hysteresis	0%, 5%, 10%, 15%, 20% (single chamber modes)

Physical Characteristics

The Core-Lith pacemakers are made with an hermetically sealed lithium-iodine battery

For better protection of the components from organic fluids, the electronic circuit and the battery are perfectly isolated into an hermetic titanium can.

The Core-Lith mass is 36 gr.

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.

Features

MAGNETIC RESPONSE	Asynchronous mode At BOL and OK: the period is 661ms 96 BPM. At ERI: the period is 750ms 85 BPM.
BATTERY CHEMISTRY	WG 8950
END-OF-SERVICE INDICATORS	Rate will go to 60 BPM irrespective of Programmed Value of Rate
ELECTIVE (ERI):	Battery remaining capacity between 4 and 8% of the total. When a magnet is applied the Magnet Rate will 85 BPM.
END OF LIFE (EOL):	Battery remaining capacity under 4% of the total. The Rate will be 60 BPM.
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 asynchronous mode.

Testing The Pacemaker

In order to test if the pacing output is enough to stimulate the heart, switch the working mode to an asynchronous one (using a magnet or the PCP+ programmer). Once the pacemaker mode has been changed, the stimuli can be detected using an electrocardiograph.

Tachycardia Treatment

Core-Lith Model 221 has two features for tachycardia treatment: the first one, temporary programming, consists in switching the pacemaker to an asynchronous mode at a special programmed rate. Usually a much higher rate than the basic one. The asynchronous pacing is maintained until the programmer head is put away from the pacemaker. In this moment, the pacemaker goes back to the original working mode. With the asynchronous stimulation at a high rate, the heart is stimulated in different moments of the cycle, helping to revert the tachycardia.

The second mechanism is enabled only when the pacemaker operates in VVI mode. It consists in sending coupled stimuli after the spontaneous QRS complexes, when the patient’s rate exceeds the programmed upper rate. The delay time is also programmable. This mechanism does not revert the tachycardia, but it decrements the rate of effective contractions.