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Internal Pacemaker

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In the human heart, a natural pacemaker, known as the sinoatrial node, is located in the wall of the right atrium of the heart.1 This pacemaker is responsible for coordinating the rhythmic contraction of the heart by regulating electrical energy through the Purkinjes fibers in the heart (these fibers are analogous to conducting wires).

There are cases where the natural pacemaker in certain individuals doesn’t function properly and, as a result, leads to erratic and uncoordinated heartbeats. In order to rectify this medical professionals make use of an internal pacemaker, which is implanted surgically. Thus the purpose of this electronic device is to maintain the regular heartbeat when the natural mechanisms decompose.

The pacemaker can be …show more content…
V. Berkovits, Demand pacer, US Patent 3,528,428, September 1970)

The function of this device was to have a timing circuit that acted on cardiac activity. As a result the device would only generate an electric pulse when the heart did not beat according to respective parameters, for example when the heart contracts normally the capacitor is only slightly charged and when the heart skips a beat/contraction the capacitors are fully charged and quickly releases its stored electrical energy through the leads stimulating the heart.

This is achieved by connecting capacitor CC1 to the device leads (located in the heart) to sense a cardiac signal. When we analyse the timing control and output driver we see current pulse is transmitted through capacitor CC3 to transistor Q6. When the switch is closed (free running mode), transistor Q6 is in cut-off condition. However, in demand mode the switch is opened and as result the transistor Q6 is conducting, allowing capacitor CT to charge. The transistors Q7 and Q8 are closed during the charging of capacitor CT. When the circuit changes to demand mode the capacitor CT will discharge until fully discharged, hereafter transistor Q6 is turned off and directs the circuit into free

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