Remote-controlled stopcock and self-rinsing syringe used in cardiovascular studies.

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Abstract
A remote-controlled stopcock is activated by an electrical impulse which energizes one coil of a double-acting solenoid whose plunger is mechanically coupled to the key of a modified laboratory 3-way stopcock. The key of the stopcock is reversibly rotated by 90[degree] depending upon which coil is energized, so the communicating lumen through the stopcock has a "L" or "I" configuration. The automatic operation of this device placed near a trained unanesthetized dog does not disturb the animal during successive measurements of arterial blood pressure and cardiac output. A self-rinsing syringe was fabricated by extending a vinyl tube through the plunger. A stopcock is connected to the tubing emerging from the neck, which when closed, the syringe functions conventionally and when opened, the system can be rinsed. This system was devised so the infusion-withdrawal syringe, external densitometer, and connecting tubing are rinsed after blood is returned following the registration of an indicator-dilution curve to minimize the possibility of syringe jamming.

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