Abstract: A continuous spinal anesthesia administering apparatus is disclosed which comprises a polymeric microcatheter having an external diameter less than about 0.0130 inch (0.330 mm) with a reinforcing stylet therein. A method for administering anesthesia to a patient utilizing this apparatus is also disclosed, as is a catheter kit containing this apparatus.

Abstract: The under voltage lockout circuit disclosed herein is useful in a switching mode power supply of the type which, in operation, powers its own regulator circuitry. The lockout circuit operates to inhibit energization of the power supply, including its own regulator, until a voltage reference is established which can control the operation of a comparator which monitors the supply voltage available to the regulator circuitry.

Abstract: In the voltage controlled current source disclosed herein, temperature compensation is provided by offsetting base emitter voltage drops in a pair of bipolar transistors of complementary conductivity types. The control voltage is applied through a resistor to the emitter of a first transistor connected in common base mode. The base voltage of the first transistor is obtained from the emitter of a transistor of complementary conductivity type, the base of which is connected to a stable voltage source. The collector current of the first transistor is then applied to a current mirror to obtain an output current which is highly proportional to the control voltage.