Patent EP0057924A2 successfully refreshed from Google Patents.
EP0057924A2
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EP
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Digitally programmable cardiac synchronized high frequency jet ventilator control system
Assignee: Memorial Sloan Kettering Cancer Center
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Filing: 1982-02-06
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Granted: —
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Expires: 2002-02-06
Abstract
Abstract A jet ventilator control system produces a periodic pulse signal either asynchronous or synchronous with a patient's pulse rate and proportional in frequency to the number of jet ventilation pulses to be applied to the patient per unit time and is digitially programmable to adjust the delay and duty cycle of the pulse signal within the period defined by the produced pulse. The duration and duty cycle adjusted pulse signals effect the application of jet ventilation pulses corresponding thereto to the patient.
Inventors
- 👤 Saul Miodownik
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 15:54
CPC Classifications
A; A61; A61M; A61M16/00; A61M16/0096
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
90 words
A jet ventilator control system comprising: means (1, 2, 3, 4, 5 resp. 15, 18) for producing a periodic pulse signal proportional in frequency to the number of jet ventilation pulses to be applied to a patient per unit time; first digitally programmable means (1 0 , 22) for adjusting the duration of the pulse signal within the period defined by the pulse producing means; and control means (11, 23) receptive of the duration adjusted pulse signals for effecting the application of jet ventilation pulses corresponding thereto to a patient.
Claim 2
Dependent Claim
90 words
A jet ventilator control system comprising: means (1, 2, 3, 4, 5 resp. 15, 18) for producing a periodic pulse signal proportional in frequency to the number of jet ventilation pulses to be applied to a patient per unit time; first digitally programmable means (1 0 , 22) for adjusting the duration of the pulse signal within the period defined by the pulse producing means; and control means (11, 23) receptive of the duration adjusted pulse signals for effecting the application of jet ventilation pulses corresponding thereto to a patient.
Claim 3
Dependent Claim
82 words
The system according to claim 1, wherein the periodic pulse producing means comprises means (1) for producing pulses asynchronously with respect to the patient's pulse rate comprising means for producing a reference frequency signal, second digitally programmable means (2) for multiplying the frequency of the reference frequency signal by a selected integer to obtain a frequency proportional to the periodic pulse frequency and means (5) for dividing the multiplied reference frequency signal by a fixed constant to obtain said periodic pulse signal.
Claim 4
Dependent Claim
43 words
The system according to claim 2, wherein the means for producing a reference frequency includes means (1) receptive to the AC power line and the frequency multiplying comprises a phase locked loop (2) and a programmable counter (3) in the feedback loop thereof.
Claim 5
Dependent Claim
37 words
The system according to claim 3, further comprising third digitally programmable means (8) for delaying each periodic pulse signal by a selected amount within each defined period prior to being received by the control means (10, 11).
Claim 6
Dependent Claim
33 words
The system according to claim 4, wherein the first and third digitally programmable means (10, 8) comprises means receptive of the frequency multiplied reference signal for effecting the desired pulse duration and delay.
Claim 7
Dependent Claim
71 words
The system according to claim 1, wherein the periodic pulse producing means comprises means (15, 18) for producing pulses in synchronism with respect to the patient's pulse rate comprising means (18) receptive of the patient's EKG signal for detecting the QRS component signal thereof and means (18) receptive of the detected signal for producing the periodic pulse signals having a frequency which is proportional to the frequency of the detected signal.
Claim 8
Dependent Claim
65 words
The system according to claim 6, further comprising third digitally programmable means (20) for delaying each periodic pulse signal by a selected amount within each defined period prior to being received by the control means (23) wherein the first and third digitally programmable means (22, 20) comprises means for producing a predetermined number of equally spaced identical pulses during each period between successive detected signals.
Claim 9
Dependent Claim
85 words
The system according to claim 7, wherein the means for detecting the QRS component signal of a EKG signal comprises delta modulating means receptive of the EKG signal and having a predetermined step size and sampling rate such that the absolute value of product thereof is less than the maximum slope of the QRS component of the EKG signal and means for digitally sensing a slope overload state of the delta modulating means and for producing an output pulse indicating the overload state (figure 3).
Claim 10
Dependent Claim
20 words
The system according to claim 8, wherein the sensing means comprises a programmable counter (PGI) presettable to a desired count.
Claim 11
Dependent Claim
103 words
The system according to claim 1, wherein the periodic pulse producing means comprises means (1, 15) for producing pulses comprises means for producing pulses asynchronously with respect to the patient's pulse rate and synchronously with respect to the patient's pulse rate and mode selecting means (MS2, MS3) for outputting one of the asynchronous and synchronous pulses as the periodic pulse signal in response to the selection of an asynchronous or synchronous mode respectively and further comprising second digitally programmable means (CTR8, CTR9) for delaying each periodic pulse by a selected amount within each defined period prior to being received by the control means.
Claim 12
Dependent Claim
56 words
The system according to claim 10, wherein the means for producing the synchronous pulses includes means (15) receptive of the patient's EKG signal and further comprising means (30) responsive to the absence of a synchronous pulse over a preselected time when in the synchronous mode for effecting a changeover of the system to the asynchronous mode.
Claim 13
Dependent Claim
54 words
The system according to claim 10, further comprising means (24) for sensing the jet ventilation pulses and for producing a first pulse signal corresponding thereto and means (13) for digitally comparing the first pulses with the duration adjusted and delayed periodic pulse signals for producing an alarm signal in response to an unfavorable comparison.
Claim 14
Independent Claim
78 words
A device for detecting the QRS component of a EKG signal comprising: delta modulation means receptive of the EKG signal and having a predetermined step size and sampling rate such that the absolute value of the product thereof is less than the maximum slope of the QRS component of the EKG signal; and means for digitally sensing a slope overload state of the delta modulating means and for producing an output pulse indicating the overload state (figure 3).
Claim 15
Independent Claim
78 words
A device for detecting the QRS component of a EKG signal comprising: delta modulation means receptive of the EKG signal and having a predetermined step size and sampling rate such that the absolute value of the product thereof is less than the maximum slope of the QRS component of the EKG signal; and means for digitally sensing a slope overload state of the delta modulating means and for producing an output pulse indicating the overload state (figure 3).
Claim 16
Dependent Claim
20 words
The device according to claim 13, wherein the sensing means comprises a programmable counter (PGI) presettable to a desired count.
Claim 17
Dependent Claim
31 words
The system according to claim 6 or 10, further comprising means for digitally programmably effecting a constant propagation delay for the periodic pulse prior to the adjustment of the duration thereof.
References Cited (Backward Citations)
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