초록 ▼

Apparatus for monitoring respiration and heartbeat and for processing electrical signals representative thereof, including circuits for developing a phase-shifted and amplitude-offset respiration signal for comparison with an original respiration signal for compensating for signal drift, and circuit

Apparatus for monitoring respiration and heartbeat and for processing electrical signals representative thereof, including circuits for developing a phase-shifted and amplitude-offset respiration signal for comparison with an original respiration signal for compensating for signal drift, and circuits for logically combining signals representative of the presence of respiration and heartbeat for eliminating certain false indications which may occur when only heartbeat exists.

대표청구항 ▼

An apparatus for monitoring patient respiration and heartbeat, comprising (a) sensor means adapted for coupling to said patient for sensing composite electrical signals representative of said patient heartbeat and respiration; (b) oscillator means for generating a carrier frequency, coupled to said

An apparatus for monitoring patient respiration and heartbeat, comprising (a) sensor means adapted for coupling to said patient for sensing composite electrical signals representative of said patient heartbeat and respiration; (b) oscillator means for generating a carrier frequency, coupled to said sensor means; (c) detector means for receiving and detecting said heartbeat and respiration signals, coupled to said sensor means and said oscillator means; (d) heartbeat detection circuit, coupled to said detector means, said heartbeat detection circuit having means for developing a first single signal responsive to each detected heartbeat; including a first circuit for generating a detected heartbeat signal and for rectifying said signal, a second circuit for receiving said rectified signal and generating a time-decaying signal therefrom, said time-decaying signal having a greater time duration than said detected heartbeat signal, and a circuit means for receiving said time-decaying signal and generating an intergrated pulse signal therefrom, and a comparator circuit means for receiving said time-decaying signal and said integrated pulse signal and generating said first single signal when said time-decaying signal is greater than said integrated pulse signal; (e) respiration detection circuit, coupled to said detector means, said respiration detection circuit having means for developing a second single signal responsive to each detected respiration; including a first integrator circuit for developing a first integrated respiration signal and a second integrator circuit for developing a second integrated respiration signal time delayed relative to said first integrated respiration signal, and a circuit for receiving said first and second integrated respiration signals and for developing said second single signal when said first integrated respiration signal is greater than said second integrated respiration signal; and (f) heartbeat alarm circuit coupled to receive said first single signal responsive to each detected heartbeat, said heartbeat alarm circuit having means for presetting a minimum and maximum heartbeat rate and having means for developing a received heartbeat rate signal responsive to said first single signals, and having means for generating an alarm when said received heartbeat rate signal falls below said minimum or above said maximum preset heartbeat rate.