Respiratory ventilation apparatus
First Claim
1. In a respiratory ventilation apparatus having a ventilator and a primary means for producing a pressure or volume supported breath cycle alternatingly providing a patient breathing pathway with a relatively high positive ventilation pressure and a relatively low positive ventilation pressure, the improvement comprising:
- means for detecting heart beats in a plurality of cardiac cycles of said patient;
secondary means for producing said relatively low positive ventilation pressure in said patient breathing pathway commencing at a variable moment following a detected heart beat for a variable time interval during selected cardiac cycles; and
means for determining said variable moment including means for determining a period of time between selected sequential heart beats of said patient, and means for multiplying a preselected multiplier value by said period of time between said selected sequential heart beats, said preselected multiplier value approximately corresponding to a computed fraction of said period of time between heart beats.
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Abstract
A gating system is provided for controlling a ventilator means, which, in turn, generates a positive pressure breath. The systems including a sensing means for sensing sequential heart beats of a patient, together with a computing means, which is connected to the sensing means, for computing a period between the sequential heart beats. In addition to the above, a valve means is connected electrically to the computing means and pneumatically to the ventilator means for controlling the ventilator means, with the valve means being positioned to cease positive pressure breaths in response to the computer period.
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Citations
26 Claims
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1. In a respiratory ventilation apparatus having a ventilator and a primary means for producing a pressure or volume supported breath cycle alternatingly providing a patient breathing pathway with a relatively high positive ventilation pressure and a relatively low positive ventilation pressure, the improvement comprising:
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means for detecting heart beats in a plurality of cardiac cycles of said patient; secondary means for producing said relatively low positive ventilation pressure in said patient breathing pathway commencing at a variable moment following a detected heart beat for a variable time interval during selected cardiac cycles; and means for determining said variable moment including means for determining a period of time between selected sequential heart beats of said patient, and means for multiplying a preselected multiplier value by said period of time between said selected sequential heart beats, said preselected multiplier value approximately corresponding to a computed fraction of said period of time between heart beats. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A respiratory ventilation apparatus, comprising:
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a ventilator having means for producing a pressure or volume supported breath cycle alternatingly providing a patient breathing pathway with a relatively high positive ventilation pressure and a relatively low positive ventilation pressure; means for detecting heart beats of said patient; control means for generating a control signal for a predetermined period of time commencing at a variable moment following selected patient heart beats, said control means including means for determining said variable moment including means for determining a period of time between sequential heart beats of said patient, and means for multiplying a computed multiplier value by said period of time between sequential heart beats to thereby generated a value representing said variable moment; control value means connected to said patient breathing pathway having an open position in which said control valve induces said relatively low pressure in said breathing pathway; and means for opening said control valve means connected to said control means and responsive to said control signal. - View Dependent Claims (14, 15)
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16. In a respiratory ventilation apparatus having a ventilator and a primary means for producing a pressure or volume supported breath cycle alternatingly providing a patient breathing pathway with a relatively high positive ventilation pressure and a relatively low positive ventilation pressure, the improvement comprising:
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means for detecting heart beats in a plurality of cardiac cycles of said patient, including means for generating an electrical heart beat signal in response to said heart beat, and amplifying means for squaring said electrical heart beat signal; secondary means for producing said relatively low positive ventilation pressure in said patient breathing pathway commencing at a variable moment following a detected heart beat for a variable time interval during selected cardiac cycles; and means for determining said variable moment. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification