Portable infusion apparatus
First Claim
1. In an apparatus for continuous infusion of a liquid from an injection syringe having a plunger, a spring driven mechanism for advancing the syringe piston and a mechanical clockwork for controlling the piston advance, the improvement comprising a piston drive mechanism actuated by a first spring and wheel transmission and a clockwork control operated by a second spring and wheel transmission.
1 Assignment
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Accused Products
Abstract
Disclosed is a portable continuous infusion apparatus for administering an injectable liquid to a patient. The apparatus expells the contents of a syringe on a time controlled basis. It employs two separate springs, with one spring used to power a clockwork and another spring to power a gear rack to advance the syringe plunger or piston. Opening and shutting the apparatus cover automatically winds both springs simultaneously. A safety prevents closing the cover unless the springs are wound. Advancement of the gear rack is adjustable by a control which acts on an escapement lever which regulates an escape wheel. The control moves the escapement lever axially so it can engage a different number of wings on the escape wheel, thereby regulating the incremental advance of the gear rack acting on the syringe plunger.
272 Citations
17 Claims
- 1. In an apparatus for continuous infusion of a liquid from an injection syringe having a plunger, a spring driven mechanism for advancing the syringe piston and a mechanical clockwork for controlling the piston advance, the improvement comprising a piston drive mechanism actuated by a first spring and wheel transmission and a clockwork control operated by a second spring and wheel transmission.
Specification