MEDICAL APPARATUS FOR MEASUREMENT OR ANALYSIS OF BLOOD PRESSURE WAVE FORMS; NAMELY, AN INVASIVE INSTRUMENT AND UNIT COMPRISED OF A COMPUTER MONITOR USED TO OBTAIN BLOOD PRESSURE WAVE DATA BY MEANS OF AN INDWELLING CATHETER, A TRANSDUCER-AMPLIFIER AND ANALOG-DIGITAL CONVERTER BOARD PRODUCING READABLE MEDIA DATA FOR ANALYSIS OF BLOOD PRESSURE IN CLINICAL RESEARCH; ALSO AN INSTRUMENT AND UNIT COMPRISED OF A COMPUTER, ELECTRONIC DISPLAY AND CONNECTION TO DIAGNOSTIC PATIENT MONITORS IN HOSPITAL IN...