Heat-activated drug delivery system and thermal actuators therefor
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United States of America Patent
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Nov 23, 1993
Issued Date -
N/A
app pub date -
Apr 2, 1992
filing date -
Jan 10, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A thermal actuator, also known as a heat capacitance motor, derives its energy from the physical expansion of paraffin wax as it changes from solid to liquid when heated within an enclosure such as a cylinder. This energy is converted into mechanical force which causes translation of a piston slidably mounted within the cylinder, thus creating hydrostatic pressure which is converted to work. The thermal actuator may be utilized in various drug delivery systems in which the hydrostatic pressure created by the actuator is used expel the contents of a syringe.
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