Abstract: The present invention provides a method and apparatus for monitoring an infusion pump (10). The method and apparatus provides an encoder (101) which is used with a motor (65) of the infusion pump (10) and a monitoring method which effectively provides rotational directional information. The present invention utilizes a state transition of a first switch (111) indexed against a constant signal from a second switch (113) corresponding to the center of a flag (117) or sector (119).

Abstract: The present invention provides an estimate of the amount of time left on the battery by monitoring not only the voltage available from the battery, but also the amount of current flowing from the battery. It has been found that periodic sampling of the battery voltage and current drain enables accurate battery monitoring. The sampling technique alternates between sampling battery voltage and sampling current drain. An electric circuit is provided which enables the cost-effective sampling to occur. A method is then applied to the sampling signals by a microprocessor which determines the amount of time left under battery power. In a preferred embodiment, a graphic representation is provided of the amount of battery time left.

Abstract: A medical infusion pump (10) for delivering liquids to a patient includes an elastomeric pump chamber (140) contractable between a refill position and a discharge position. An inlet valve (122) is operatively associated with an elastomeric inlet (142) supplying liquid to the pump chamber (140). The inlet valve (122) is selectively positionable in an open position permitting and a closed position preventing flow of liquid between the inlet (142) and the pump chamber (142). An outlet valve (124) is operatively associated with an elastomeric outlet (144) which conveys liquid from the pump chamber (140). The outlet valve (124) is selectively positionable in an open position permitting and a closed position preventing flow of liquid between the outlet (144) and pump chamber (140). A pump motor (256) and associated plunger (120) contracts and expands the pump chamber (140) between the refill position and the discharge position.

Abstract: A port assembly for a container is provided. The port assembly includes an elongated tube extending from an end of a base, the tube defining a tubular bore for receiving a member for accessing the container. The tubular bore includes a membrane for separating the tubular bore into a first portion and second portion, the first portion being closer to the container than the second portion. A resealing injection site is mechanically locked within the second portion of the channel. A method for making the port assembly is also provided.

Abstract: A port and closure assembly is provided. The closure includes a sleeve member and the port a rib member. The sleeve member having an inner circumference that is less than the outer circumference of the rib. The port and closure cooperating to produce an audible signal when the closure is removed from the port.