Direct readout real time physiological parameter analog computer

• US 4,112,491 A
• Filed: 07/05/1977
• Issued: 09/05/1978
• Est. Priority Date: 07/05/1977
• Status: Expired due to Term

• Current Assignee: LIFT Biosciences, Ltd.
• Original Assignee: LIFT Biosciences, Ltd.
• Inventors: Bugay, Al
• Primary Examiner(s): Morrison, Malcolm A.
• Assistant Examiner(s): Krass, Errol A.
• Application Number:
  US05/812,752
• Time in Patent Office: 427 Days
• Field of Search: 364/415-417, 364/800, 364/807, 364/510, 364/571, 128/2.05 R, 128/2.05 C, 128/2.05 F, 128/2.1 R, 73/194 R, 235/92 FL
• US Class Current: 600/502
• CPC Class Codes: A61B 5/026 Measuring blood flow A61B3/1233, A61B3/1241 take precedence

Abstract

A medical electronic diagnostic device particularly suitable for determining and displaying segmental pulsatile flow of a patient. Means are provided for stabilization of a calibrated segmental volume time curve relative to a baseline, so as to eliminate the effect of patient movement during testing, as well as miscellaneous electrical noise. The disclosed device is capable, in addition to displaying a pulse volume curve, of measuring and recording the pulsatile component of the total blood flow.

Claims

1. An improved physiological parameter analog computer for displaying components of measured pulsatile flow comprising:

first means receiving a pulsatile wave form signal representing said flow;

second frequency selection amplifier means passing frequency components of said signal above a predetermined frequency level;

third means stabilizing signals received from said second means relative to a known baseline reference voltage;

fourth means detecting each pulsatile impluse wave form from said third means and producing a single output pulse therefrom;

fifth means providing a measured time interval;

sixth means performing a voltage summation time derivative measurement during said time interval;

seventh counter/means counting the number of pulsatile impulses occurring during said measured time interval; and

eighth means multiplying the output of said seventh means by the output of said sixth means; and

ninth means displaying the output of said eighth means.

2. A computer as set forth in claim 1, further comprising tenth means for selectively multiplying said pulsatile flow wave form signal by one of several electrical constants for obtaining scale factor correction.

3. A computer as set forth in claim 1 wherein said third means comprises a cutoff filter passing signal components above 0.3Hz.