The United States of America as Represented by the Department of Health

Elijah C Walker

Horace E Cascio

An apparatus for measuring the pressure-transmitting characteristics of a blood pressure cuff in terms of delivered cuff pressure. It consists of a somewhat flexible cylindrical supporting tube containing a non-compressible liquid, connected to a pressure transducer. The cuff is wrapped around the tube, and the remaining exposed area of the tube is covered by a rigid cylindrical tube to prevent bulging of the supporting tube when cuff pressure is applied thereto. The cuff is pressurized while simultaneously recording its pressure and the transducer detected pressure. The resulting X-Y curve is compared with one taken of the supporting tube alone.

Blood pressure cuff calibration system

A flow indicating attachment for a transparent rotameter column containing a visible float movable in accordance with the rate of fluid flow through the column consists of a reciprocating scanner moving parallel to the column in a flow rate range including the range of float movement and coupled to a potentiometer forming a synchronous analog scanning signal which is furnished to a recorder. The scanner has a photoelectric float-sensing assembly including a photocell connected in the analog scanning signal circuit. When the sensing assembly is shaded by the rotameter float, it produces an abrupt dip in the recorded analog scanning signal, thus providing a recorded indication of the float's position in the range covered by the track of the reciprocating scanner.

Scanning flow indicator for rotameters

A tranquilizer dart for injecting a tranquilizing liquid into an animal consists of a cylindrical chamber with a tapered forward end provided with a pointed hollow needle. A conical valve bears against an annular seat in the chamber and has a triggering pin extending through the needle and normally projecting forwardly beyond its point. Tranquilizer liquid is contained in the chamber between the valve and a front plunger. A rear plunger is provided in the rear end of the chamber, and rearward movement thereof is limited by an insertable stop pin. The rear plunger serves, on loading, to compress the air between itself and the front plunger. Responsive to impact, the triggering pin is pushed back, unseating the conical valve, and the compressed air forces the front plunger forward, thus injecting the liquid into the animal.

Growing community of inventors

Takoma Park, MD, United States of America

Elijah C Walker