United States Surgical Corporation

C. R. Bard, Inc.

Audivox Corporation

Donald L Johanson

Thomas S Chan

James G Skakoon

Raymond J Bonthron

A small, light weight, battery operated, fixed speed syringe infusion pump is capable of being IV pole mounted. A disposable syringe is secured in a snap-in holder and the syringe plunger is moved by a pusher. The pusher is advanced to the syringe plunger by squeezing a finger tab. This simultaneously decouples the pusher from the internal drive and opens the antisiphon catch to allow quick and easy set-up. To initiate flow, a switch is moved to the 'on' position. The pusher is moved by the engagement of a nut on a threaded lead screw. The lead screw is rotated, through appropriate gearing, by a direct current motor. A force sensing system is included as part of the syringe holder and is used to detect end of syringe and occlusion. Visual indicators and audio alarms for infusion and warning and to sense condition of the batteries are provided.

Battery operated miniature syringe infusion pump

Hearing aid

An in-the-ear hearing aid in which a complete functional instrument is contained within a modular housing of standardized configuration and which is attachable to a custom ear mold for a particular user's ear. The modular housing is anthropometrically configured and is readily attached to and removed from the ear mold for repair and replacement.

Modular in-the-ear hearing aid

A hearing aid in which the sound reception characteristics are selectable by a user to provide a non-directional or directional reception, as desired. The hearing aid houses a differential transducer having two sound receiving ports communicating with front and rear sound receiving apertures through a network of sound conducting paths. Acoustic switching means are employed to selectably direct sound energy to the transducer through the sound conducting paths, which have equal acoustical impedance in either operating mode, and electric switching means may be associated with the acoustic switching means for adjusting the circuit gain to maintain substantially equal gain for both modes of operation. Frequency characteristics of the hearing aid response in both modes are matched so that switching from one mode to another does not materially alter the quality of sound received from the front of a user.

Growing community of inventors

Wayland, MA, United States of America

Donald L Johanson