Plaster structures for iontophoresis are disclosed for the administration of drugs through skin and mucous membranes. The devices provide for the stable retention and storage of a predetermined amount of a physiologically active agents until the device is applied to a patient. The devices include an electrically conductive medicinal substance storing layer which contains physiologically active agents, and a non-permeable backing layer which covers the medicinal substance storing layer. An electrode passes through the backing layer where it makes contact with the medicinal substance storing layer. On the opposite side of the storing layer a non-permeable protective layer is provided which a has a portion adapted to be removed to allow access to the medicinal substance storing layer. This protective layer supports the medicinal substance layer and, on the opposite side, is provided with an adhesive agent layer. The adhesive agent is protected by a laminate layer. The device is designed so that when the laminate layer is removed to expose the adhesive agent, a potion of the protective layer is also removed allowing the medicinal substance storing layer to be brought into contacted with skin or a mucous membrane.

A toy stethoscope including a flexible yoke with earpieces on the outer ends of the arms thereof, flexible tubes respectively extending along the arms from the earpieces to one end of a cylinder having a reciprocable plunger therein to produce sounds simulating natural heartbeats, another tube connected at one end to the other end of the cylinder and the other end of the tube being connected to a bellows element adapted to be manually operated to compress and release one end of the same to successively produce air pressure and suction operable upon the plunger to effect the sounds simulating natural heartbeats.

An improved acoustic earpiece of the type used to transmit sound mechanically from a sound source to the ear drum of a listener is disclosed herein. The acoustic earpiece includes a tube and a resilient element surrounding one end thereof comprising an open cell resilient foam with a slow compression recovery rate and a fully compressed diameter of less than the diameter of the human ear canal.

A precordial monitor including a head that has a chamber for capturing sound from a patient's body. The head has an acoustic probe for detecting the sound captured in the chamber and a temperature sensor for measuring the skin temperature of the patient.