Importance

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Abstract

A combination comprising a syringe, an adaptor, a check valve, and associated connectors for an intravenous infuser for patient-controlled analgesia. The infuser comprises a cradle adapted to receive an annular or disc-shaped element fitting into the cradle and a switch adapted to disable the infuser unless such an element is fitted into the cradle. The syringe comprises a vial, a plunger arranged within the vial for relative movement of the plunger and the vial, a tubular needle extending through an axial hole of the plunger, and a flange mounted around the needle and spaced from the plunger but too small to fit into the cradle. An adaptor having an outer rim adapted to fit over the flange and into the cradle and a check valve mounted operatively in the adaptor are connected by tubular connectors to the flange. The check valve allows an infusible liquid to flow from a chamber within the vial, through the tubular needle, and through the check valve, but not oppositely.

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First Claim