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The NEVA™ System is an device to measure and record penile erectile events nocturnally.

The UroMetrics NEVA system consists of three disposable electrodes sets, a portable battery powered recorder, a host interface, cables and a computer program. Two of the three electrode sets are placed on the penis so that one electrode set is on the glans terminating just proximal to the glans, one set is at the base of the penis terminating a fixed distance from the base of the penis. The third electrode is attached to the patient's hip. The wires from the electrodes terminate in a phone connector which plugs into the portable NEVA recorder. The electrodes and the recorder are used by the patient to monitor nocturnal tumescence for up to three nights. The host interface and the computer program are used to prepare (initialize) the recorder for use and to download the data from the recorder for display and analysis on a physician's computer. The NEVA system indicates penile tumescence by monitoring changes in volume, length and area. Due to a variety of factors (patient position, etc.) the size of the penis can change its shape. An increase in length, by itself, may not indicate tumescence. Tumescence is generally indicated by an increase in volume, length and area. This is the primary reason the NEVA system displays volume, length and area throughout the test. Impedance values which are used to determine penile volume, length and area are continuously recorded at one second intervals. The one second time base and the change in volume data allow a physician to determine the fill rate once periods of tumescence are identified. The NEVA system determines changes in volume by measuring the impedance within the penis. A low powered alternating current is sent from the electrode on the glans to the ground electrode on the hip. The remaining electrodes are used to measure the impedance. The electrode set at the base of the penis includes electrodes which are separated by a fixed distance. As the cross-sectional area of the blood volume in the penis increases, there is a decrease in measured impedance in the base electrode set. These impedance changes are then converted to a volume reading by the host computer. With an increase in distance between the base electrode and the electrode posterior to the glans (penis length) there is an increase in the impedance between these electrodes. This change in impedance is converted to a length reading. To begin a test, the NEVA recorder is plugged into a computer through the host interface to a host computer running the NEVA software. The computer and software will recognize the recorder and will display a menu which allows the physician to download previously recorded data or initialize the recorder for a new test. To begin a new test, the physician enters the patient's name and other information and initializes the recorder. All previous data are cleared and the patient information is saved to the recorder. The NEVA software allows the physician the option of real time measurements while connected to the computer. This capability is useful to demonstrate the proper placement of the electrodes and to check for proper operation. Once the NEVA recorder is initialized and the patient is instructed in its use, the recorder and electrodes are sent home with the patient. The electrodes are designed for single use so a separate set of electrodes is needed for each night (sleep period) of the test. The NEVA recorder is normally in standby mode until the electrodes are placed on the patient and the connector is plugged into the recorder. When the connector is removed the recorder returns to the standby mode. Patients should be instructed to plug in the electrodes at the beginning of the test and unplug the electrodes at the end of the test. The recorder can store data for a maximum of 36 hours, typically three sleep periods. At the end of the test period, the NEVA recorder is plugged into a computer through the host interface to a host computer running the NEVA software. The computer and software will recognize the recorder and will display a menu which allows the physician to download the data. The data are then downloaded to the computer and stored on the computer's hard drive. The impedance data are converted to volume, length and crosssectional area plots which are displayed graphically on the computer screen. The software incorporates a number of features which facilitate the analysis and interpretation of the data by the physician.

Measurement of penile cavernosal artery velocities. Not intended for fetal use. Diagnostic ultrasound imaging or fluid flow analysis of the human body as follows: Peripheral Vascular (PWD)

The UroMetrics Knoll/MIDUS System is an office based Doppler ultrasound system designed to measure blood velocity in the penile cavernosal arteries. The system consists of a portable or desktop IBM compatible personal computer containing a proprietary circuit board and transducers. Blood velocity is determined by detecting the Doppler shifts of an 8 MHz ultrasound signal. Proprietary software converts this data into a useable waveform display, which is shown on the computer video display.