Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 5531780 | Implantable stimulation lead having an advanceable therapeutic drug delivery system A pacing lead having a stylet introduced anti-inflammatory drug delivery element advanceable from the distal tip electrode. The element is preferably formed as a moldable biocompatible composite material. The element has a biocompatible matrix material wh... | 07/02/1996 |
| 5518001 | Cardiac device with patient-triggered storage of physiological sensor data A cardiac device that stores physiological sensor data from multiple sensors is provided. A patient may use a portable triggering device to cause the cardiac device to store the data when the patient experiences symptoms that appear to be due to an abnorm... | 05/21/1996 |
| 5514164 | DDD pacing response to atrial tachyucardia and retrograde conduction An implantable pacemaker operates in a DDD mode and reverts to a modified DDI mode in response to sensing atrial depolarization early in the pacing cycle. The modified DDI mode, when invoked, provides additional atrial kick by generating an atrial stimula... | 05/07/1996 |