Surgery – Truss – Perineal
Patent
1975-09-26
1977-06-07
Howell, Kyle L.
Surgery
Truss
Perineal
128 205Z, 128 205Q, A61B 502
Patent
active
040276627
ABSTRACT:
A pneumatic regulator including a constant-volume reference chamber and associated pressure-sensitive inflation and deflation valves is provided to effect a precise linear depressurization of an inflatable cuff which has been applied to a patient and pressurized to a value higher than the patient's systolic pressure. Pulses obtained from an ultrasonic or other suitable detector sensitive to movements of the patient's arterial wall in synchronism with the blood flow surges as the cuff is depressurized below the patient's systolic pressure are integrated and then translated into variable-duration marking impulses. Such impulses are successively applied to the actuating input of a pen or other marker associated with an X-Y recording chart, the pen being linearly scanned along one chart axis at the constant depressurization rate of the cuff. During such scan, the pen records, on the chart, a linear pattern of marks each of which has a length corresponding to the duration of the marking impulse then applied to its actuating input. Facilities are also described for operating an alarm when the patient's systolic or diastolic pressure does not fall within a prescribed range and for accurately and rapidly distinguishing valid blood flow surges from artifacts during the cuff depressurization.
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Southwestern Inst. of Elect. & Electronic Engng. Conf. Record, Apr., 1968, pp. 17F1-17F5.
Howell Kyle L.
Milstein Medical Research Foundation, Inc.
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