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Cardiac pacemaker, London, England, 1961-1962

1961-1962

Ventak™ implantable cardioverter defibrillator

1984-1992

Programmable A-V Pacemaker

circa 1990

Cardiac pacemaker by Joseph Lucas Ltd.

Explanted Micro-Minix™ ventricular demand pacemaker

1993

Ferranti QRS synchronous pacemaker

The Micra Transcatheter Pacing System is the world’s smallest pacemaker, minimizing the overall size into a device the size of a vitamin pill. As with traditional pacemakers, Micra treats a slow heart rate by delivering electrical signals to stimulate cardiac muscle and restore its rhythm. Unlike most pacemakers that are placed in a patient's chest with electrical leads running to the heart, this device is a leadless pacemaker because it's implanted directly into the heart. This allows Micra to eliminate the major sources of complications with traditional pacemakers, that being the electrical lead and implantable pulse generator. Since this device is completely self-contained within the heart, there is no bump under the skin and no chest scar. [from Medtronic]

The Micra Transcatheter Pacing System

2022-03-08
Pacemaker, Medtronic 5800 (first production)

Medtronic 5800 Pacemaker

1958
Pacemaker, external model, prototype made at Hammersmith, battery powered, without catheter, c.1958

Pacemaker, external model

Explanted Relay dual chamber demand pacemaker, with two leads, ends missing, senses and delivers pulses to both the atrium and ventricle, with sensor enabling response to variations in activity by wearer, by Intermedics SA, Switzerland, from St George's Hospital, Tooting, 1993.

Explanted Relay Dual Chamber Demand pacemaker

1993
Explanted Legend II™ single chamber demand pacemaker, with sensor enabling response to variations in activity by wearer, by Medtronic, Holland, from St George's Hospital, Tooting, 1993

Explanted Legend II™ single chamber demand pacemaker

1993
Explanted Trios single chamber demand pacemaker, by Biotronik, Germany, serial no. 37430629, fitted with bipolar lead with tined end for trapping in endocardial muscles, by Telectronics, from St George's Hospital, Tooting, 1991-3

Explanted Trios single chamber demand pacemaker

1991-1993