Medical pulse analyzing apparatus

Claim 2

In a medical arterial pulse analyzer, a pulse rate indicator comprising: photoelectric means for sensing the arterial pulse and for generating an electrical signal in response thereto; a buffer circuit coupled to said photoelectric means adapted to isolate said photoelectric means from subsequent circuitry; an amplifier circuit connected to said buffer circuit and having a pair of transistors coupled in a collector-to-base relationship for receiving and increasing the gain of said generated electrical signals; a driver circuit operably connected to said amplifier including an CR adapted to be gated ON by said increaSed gain electrical signals introduced from said amplifier so that said SCR functions in a pulse active mode of operation; an acoustical reproducing means operably coupled to said driver circuit for receiving operating current therefrom during the time said SCR is gated ON for producing an audible sound at each arterial pulsation; a pulse shaper connected to said driver circuit and adapted to process said electrical signals therefrom to provide pulse signals of uniform amplitude and duration; a low pass filter coupled to said pulse shaper adapted to receive said pulse signals and remove the AC component of said pulse signals employing a DC voltage which is directly proportional to the rate of received pulse signals from said pulse shaper; meter circuitry coupled to said low pass filter including a differential amplifier including a pair of matched field effect transistors having high input impedance and a meter movement coupled to said transistors in the circuit adapted to deflect across a scale for visually displaying the arterial pulse rate; and a pulse monitor comprising: a diode, a variable gain control resistance and a second meter connected in series relationship; and said diode operably coupled to said amplifier so that said second meter will deflect in response to the presence of each of said generated signals to indicate stroke/volume.

Claim 3

In a medical arterial pulse analyzer, a pulse rate indicator comprising: photoelectric means for sensing the arterial pulse and for generating an electrical signal in response thereto; a buffer circuit coupled to said photoelectric means adapted to isolate said photoelectric means from subsequent circuitry; an amplifier circuit connected to said buffer circuit and having a pair of transistors coupled in a collector-to-base relationship for receiving and increasing the gain of said generated electrical signals; a driver circuit operably connected to said amplifier including an SCR adapted to be gated ON by said increased gain electrical signals introduced from said amplifier so that said SCR functions in a pulse active mode of operation; an acoustical reproducing means operably coupled to said driver circuit for receiving operating current therefrom during the time said SCR is gated ON for producing an audible sound at each arterial pulsation; a pulse shaper connected to said driver circuit and adapted to process said electrical signals therefrom to provide pulse signals of uniform amplitude and duration; a low pass filter coupled to said pulse shaper adapted to receive said pulse signals and remove the AC component of said pulse signals employing a DC voltage which is directly proportional to the rate of received pulse signals from said pulse shaper; meter circuitry coupled to said low pass filter including a differential amplifier including a pair of matched field effect transistors having high input impedance and a meter movement coupled to said transistors in the circuit adapted to deflect across a scale for visually displaying the arterial pulse rate; and systolic blood pressure measuring and displaying means comprising: an including cuff; a transducer connected to said cuff for providing an electrical signal equivalent to the pressure of said cuff; a meter circuit; a gating means coupled in series relationship between said transducer and said meter circuit; a capacitor connected in parallel relationship to said transistors between said gating means and said meter circuit; and a bistable circuit interconnected between said gating means and said pulse shaper for controlling the operation of said gating means.

Claim 4

In a medical arterial pulse analyzer, a pulse rate indicator comprising: photoelectric means for sensing the arterial pulse and for generating an electrical signal in response thereto; a buffer circuit coupled to said photoelectric means adapted to isolate said photoelectric means from subsequent circuitry; an amplifier circuit connected to said buffer circuit and having a pair of transistors coupled in a collector-to-base relationship for receiving and increasing the gain of said generated electrical signals; a driver circuit operably connected to said amplifier including an SCR adapted to be gated ON by said increased gain electrical signals introduced from said amplifier so that said SCR functions in a pulse active mode of operation; an acoustical reproducing means operably coupled to said driver circuit for receiving operating current therefrom during the time said SCR is gated ON for producing an audible sound at each arterial pulsation; a pulse shaper connected to said driver circuit and adapted to process said electrical signals therefrom to provide pulse signals of uniform amplitude and duration; a low pass filter coupled to said pulse shaper adapted to receive said pulse signals and remove the AC component of said pulse signals employing a DC voltage which is directly proportional to the rate of received pulse signals from said pulse shaper; meter circuitry coupled to said low pass filter including a differential amplifier including a pair of matched field effect transistors having high input impedance and a meter movement coupled to said transistors in the circuit adapted to deflect across a scale for visually displaying the arterial pulse rate; and systolic blood pressure measuring and displaying means comprising: an including cuff; a transducer connected to said cuff for providing an electrical signal equivalent to the pressure of said cuff; a meter circuit; a gating means coupled in series relationship between said transducer and said meter circuit; a capacitor connected in parallel relationship to said transistors between said gating means and said meter circuit; and a bistable circuit interconnected between said gating means and said pulse shaper for controlling the operation of said gating means.

Claim 5

The invention as defined in claim 2 including: switch means interconnected between said capacitor and said first mentioned meter circuitry for coupling the discharge of said capacitor thereto so that said first mentioned meter circuitry may be employed to selectively visually dIsplay both pulse rate and systolic blood pressure; and connection means disposed between said switch means and said filter.