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Allan E Marble

Roderick W Landymore

Donald Wesley Church

Leslie T Russell

A novel double-balloon septal defect occlusion catheter which is used in conjunction with a unique surgical procedure to temporarily close septal perforations, particularly spontaneous ventricular septal perforations following acute myocardial infarction, without the need for open heart surgery, thus permitting the patient's condition to stabilize and permitting elective surgical closure of the defect at a later date.

Method for effecting closure of a perforation in the septum of the heart

Self-contained, micro-electronic heart monitor for mounting on or near the heart during surgery, to monitor the electrical activity of the heart during cardioplegic arrest by picking up and amplifying electrical signals from the heart and displaying an output when the signal exceeds a threshold level.

Encapsulated microelectronic heart monitor

The circuit comprises an elapsed time indicating meter and a silicon-controlled rectifier, used to supply power to the meter, connected in series across the circuit's first and third terminals. Additionally, the circuit includes a small resistor connected between the second and third input terminals, that is, connected in series with the a.c. device. This small resistor receives the current through the a.c. device and the voltage across the small resistor is indicative of the operational state of the a.c. device. A variable potentiometer is connected full scale across the small resistor and the variable voltage is amplified by a common-base transistor. This amplified voltage is both rectified and filtered, serving as the SCR's gate terminal input for triggering the SCR. The potentiometer is adjustable to allow the SCR to trigger in either one of two conditions. The potentiometer can be adjusted so that the SCR triggers at all times during which the motor is turned on, or the potentiometer can be adjusted so that the SCR turns on only when the device, such as a motor, is operated under load. The latter condition allows the elapsed time indicating meter to record the cumulative time during which the device is actually performing work.

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Halifax, Canada

Allan E Marble