Device and process for breath-supporting respiration
First Claim
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1. A device for breath-supporting respiration, the device comprising:
- a breathing gas source;
an expiration valve;
an inspiration line from said breathing gas source to a patient;
an expiration line from the patient to said expiration valve;
a feed means for feeding breathing gas, which is arranged downstream of said breathing gas source and can be actuated;
a flow sensor for sensing flow in said expiration line, and for supplying a measured breathing gas flow value dVem/dt;
a pressure sensor for determining a breathing gas pressure measured value pvm on the incoming flow side of said expiration valve;
a first control for acting on said expiration valve for setting an expiration valve closing pressure pv based on said measured breathing gas flow value dVem/dt and said breathing gas pressure measured value pvm and according to a presetting of a pressure set point;
a second control forming a control loop and acting on said feed means as a final control element, said second control setting a gas flow, not equal to zero, with said feed means for determining the expiration valve closing pressure pv, said setting of the gas flow being based on a presetting of a set point for a pre-inspiratory inspiratory gas flow dVemin/dt, not equal to zero, and said breathing gas measured flow value dVem/dt as the actual value; and
a control means for generating breathing support by acting on said feed means to provide a breathing support inspiration flow higher than said setting of the gas flow when the pre-inspiratory gas flow dVisoll/dt necessary for maintaining the closing pressure pv exceeds a preset threshold value.
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Abstract
A respirator for breath-supporting respiration has improved sensitivity of triggering breathing support. A pre-inspiratory inspiratory gas flow is set, which flows off via the expiration valve (9). The closing pressure pv of the expiration valve is measured with a pressure sensor (11) in the process. The gas flow is increased in case of an inspiratory effort of the patient to the extent that the closing pressure pv of the expiration valve (9) is restored. Breath support is generated when the difference between the preset gas flow and the gas flow that is needed to maintain the closing pressure pv at a constant level exceeds a predetermined threshold value.
39 Citations
9 Claims
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1. A device for breath-supporting respiration, the device comprising:
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a breathing gas source; an expiration valve; an inspiration line from said breathing gas source to a patient; an expiration line from the patient to said expiration valve; a feed means for feeding breathing gas, which is arranged downstream of said breathing gas source and can be actuated; a flow sensor for sensing flow in said expiration line, and for supplying a measured breathing gas flow value dVem/dt; a pressure sensor for determining a breathing gas pressure measured value pvm on the incoming flow side of said expiration valve; a first control for acting on said expiration valve for setting an expiration valve closing pressure pv based on said measured breathing gas flow value dVem/dt and said breathing gas pressure measured value pvm and according to a presetting of a pressure set point; a second control forming a control loop and acting on said feed means as a final control element, said second control setting a gas flow, not equal to zero, with said feed means for determining the expiration valve closing pressure pv, said setting of the gas flow being based on a presetting of a set point for a pre-inspiratory inspiratory gas flow dVemin/dt, not equal to zero, and said breathing gas measured flow value dVem/dt as the actual value; and a control means for generating breathing support by acting on said feed means to provide a breathing support inspiration flow higher than said setting of the gas flow when the pre-inspiratory gas flow dVisoll/dt necessary for maintaining the closing pressure pv exceeds a preset threshold value. - View Dependent Claims (2, 3)
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4. A process for controlling a respirator, the process comprising:
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providing a breathing gas source; providing an expiration valve; providing an inspiration line from the breathing gas source to a patient; providing an expiration line from the patient to the expiration valve; providing a feed means arranged downstream of the breathing gas source with the feed means being actuatable; providing a flow sensor sensing flow in the expiration line and for supplying a measured breathing gas flow value dVem/dt; providing a pressure sensor sensing pressure on the incoming flow side of the expiration valve; setting of a pre-inspiratory gas flow, not equal to zero and corresponding to a presetting of a set point, dVemin/dt; allowing the flow to flow off via the expiration valve at a preset closing pressure pv; measuring the closing pressure pv as a measured pressure valve pvm with the pressure sensor; increasing the pre-inspiratory gas flow with the feed means when the measured pressure value pvm drops because of an inspiration effort on the part of the patient until the preset closing pressure pv is restored; and generating breath support with a control means acting on said feed means to provide a breathing support inspiration flow higher than said setting of the gas flow and said pre-inspiratory gas flow when the pre-inspiratory gas flow dVisoll/dt necessary to maintain the closing pressure pv exceeds a preset threshold value. - View Dependent Claims (5, 6)
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7. A device for breath-supporting respiration, the device comprising:
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a breathing gas source; an expiration valve; an inspiration line from said breathing gas source to a patient; an expiration line from the patient to said expiration valve; a feed means for feeding breathing gas, which is arranged downstream of said breathing gas source and can be actuated; a flow sensor for sensing flow in said expiration line, and for supplying a measured breathing gas flow value dVem/dt; a pressure sensor for determining a breathing gas pressure measured value pvm on the incoming flow side of said expiration valve; a first control forming a first control signal for acting on said expiration valve for setting an expiration valve closing pressure pv based on a difference between a presetting of a pressure set point pv soll and a closing pressure based on said measured breathing gas flow value dVem/dt and said breathing gas pressure measured value pvm; a second control forming a second control signal dVisoll/dt for a minimum expiratory flow based on a difference between a set point for a pre-inspiratory gas flow dVemin/dt, not equal to zero, and said measured actual breathing gas flow value dVem/dt, said second control signal dVisoll/dt acting on said feed means for setting a gas flow for determining the expiration valve closing pressure pv; and means for generating a trigger signal for acting on said feed means to provide a breathing support inspiration flow when said second control signal dVisoll/dt for maintaining the closing pressure pv exceeds a preset threshold value. - View Dependent Claims (8, 9)
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Specification