Abstract: A therapy system includes a patient support apparatus and a pneumatic therapy device that is coupleable to the patient support apparatus. The therapy device may receive power and air flow from the patient support apparatus.

Abstract: An electronic system for detecting and tracking the resonant frequency of a photoacoustic cell is described. The system includes and makes use of inherent signal acquisition properties. The detection and tracking circuitry promotes acoustic oscillation at the cell resonant frequency while the amplitude of the acoustic oscillation is automatically controlled at a specific reference level. Under normal operation, a change in system oscillation amplitude with respect to the reference level is considered to be the result of additional acoustic excitation other than that provided by the electronic system. Changes in the oscillation amplitude, as compared to a reference level, produce an error signal which is directly related to the additional acoustic excitation. The system is particularly useful in measuring gaseous phase materials over a wide dynamic range of concentrations.

Abstract: A muzzle apparatus is arranged for mounting to a muzzle portion of an associated canine, wherein the muzzle apparatus contains an ultra sound receiver, as well as a scent saturated gauze member mounted about the muzzle apparatus to enhance excitement and activity in an associated dog such as utilized in racing. A modification of the invention includes further structure for securing a dog in a limited ambulatory manner.

Abstract: A hand held personal alarm incorporating a high intensity light and loud horn and further incorporating a plurality of switches that are located a distance apart that prevents their actuation by the digits of a single hand or by pressing the alarm against a single surface. The switches provide the only means of deactivating the alarm once activated. An alternative embodiment includes a timing circuit that prevents deactivation of the alarm for a set period after activation. Both schemes prevent easy deactivation of the alarm by an assailant, thereby providing more protection than with conventional hand held alarms.