Abstract: A pacer for cardiac pacing and condition monitoring wherein the electrical characteristics of the pacer are altered upon a temporary or permanent change in monitored conditions, such as loss of capture or failure to sense. The monitor acts to provide both increased stimulus to recover capture and to provide warning pulses indicating loss of capture or failure to sense, which are sufficiently discernible upon an electrocardiogram to enable later diagnosis, even after self-correction. After diagnosis, the monitor can be reset to its original condition by means of an external control, such as a magnet. The unit may be surgically implanted or employed externally.

Abstract: A high speed microfilm searching system is disclosed. The system optically displays frames of the microfilm. A frame or column of microfilm is made up of a sensor mark, pages of information and an index code. The index code is a meaningful alphanumeric or numeric key that accompanies each page or column. If it is alphabetic it varies in strict alphabetic sequence. If the components of the key are numeric they vary in an increasing or decreasing order. Microfilm projecting means mounted in the filmpath between feed and take-up reels clearly display on a viewing screen a page of information when the microfilm is stationary in accordance with existing technology. The high speed search system is new technology. A strobe lamp displays indexes of the moving microfilm on a screen. Each of the frames having an index of digital form and also has an optically detectable marker.

Abstract: A self-powered dart system is disclosed which comprises a self-powered dart and a launcher for launching the dart. The self-powered dart consists of a stretchable elongated body, such as a rubber tube, having a weighted head at one end and a launching connection at the other end. The launcher consists of a handle having a pivotable launching post mounted in a bent top portion of the handle. The self-powered dart is connected to the launching post, for example by positioning the post in the end opening of the rubber tube dart body. The head is drawn backwards (like the tail of an arrow in archery) with the launching post in a vertical position to temporarily engage the dart tail so as to permit stretching of the dart body. When the head is released it snaps across the top of the handle, changing from pointing backwards to pointing forwards, rotating the launching post to the horizontal position to permit the release of the dart body without imparting undesirable side forces.

Abstract: Described is method and apparatus for transmission of electrocardiography (EKG) signal wave trains from a patient's location via common carrier wire lines, such as telephone lines, to a central diagnostic office. The EKG signals consist of a composite train of Pacemaker potentials (artifacts) derived from an implanted Pacemaker, and of potentials derived from the heart itself. At the central, the EKG signals are pen-recorded, but additionally a train of Pacemaker artifacts only, is formed and from it is determined the Pacemaker frequency as an indication of remaining Pacemaker battery life. The central is provided with additional equipment, such as an arrhythmia analyzer which prepares an interval histogram from the patient's EKG signal. The histogram serves as an indication of "loss of capture" of the patient's heartbeat by the Pacemaker and such loss of capture is confirmed by the absence of correlation between the Pacemaker artifact and the "QRS complex" portion of the patient's EKG.