EP0347015A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Medical ventilator system
Assignee: Bird Products Corp
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Filing: 1985-07-01
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Granted: —
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Expires: 2005-07-01
Abstract
Abstract A volume ventilator (10) has a ballon valve type (180, 182) exhalation valve for permitting release of gases to the ambient during exhalation period or when there is excess proximal pressure in the ventilator system. The instantaneous proximal pressure in the ventilator system is sent to a microcomputer controller (38). The pressure in the ballon (180), which is the pilot pressure of the exhalation valve (164), is regulated through a jet venturi type pressure controller (80) by a ball valve (204). The ball valve is controlled by a stepper motor (216) in response to the difference between the instantaneously sensed proximal pressure, and the pilot pressure required to be present in the ballon in accordance with an algorithm, or preselected pilot pressure-versus-time function. Accurate servo control of the flow of respiratory gas to the patient is accomplished by a flow control subsystem (86) which incorporates a flow control valve (90) controlled by a second stepper motor (108).
Inventors
- 👤 Douglas F. Devries
- 👤 Arie Cohen
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 18:24
CPC Classifications
A; A61; A61M; A61M16/00; A61M16/021; A61M16/022; A61M16/024; A61M16/20; A61M16/201; A61M16/202; A61M16/203; A61M16/204; A61M16/205; A61M16/206; A61M16/208; A61M16/209; A61M16/08; A61M16/0816; A61M16/0833; A61M16/10; A61M16/105; A61M16/106; A61M16/107; A61M16/0003; A61M2016/0015; A61M2016/0018; A61M2016/0021; A61M2016/003; A61M2016/0033; A61M2016/0039
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
273 words
A ventilator system for providing artificial ventilation to a patient, the system comprising a pessure regulated source (44) of respiratory gas, conduit means to be coupled to the patient flow control means (88) for controlling the flow of the respiratory gas to the conduit means in accordance with a predetermined flow rate-versus-time function; means (18) for measuring the flow rate of the respiratory gas downstream of the flow control means (88) and for generating a first electric signal indicative of said flow rate; exhalation valve means (164) for controlling the discharge from the conduit means of the respiratory gas and the exhaled gas from the patient; pressure control means (80) operatively connected with the exhalation valve means (164) for controlling the exhalation valve means (164) to maintain the pressure in the conduit means in accordance with a predetermined pressure-versus-time function; and computer means (38) for receiving the first electric signal, for providing the predetermined pressure-versus-time function, for comparing the value required by the predetermined flow rate-versus-time function with the instantaneous flow rate as indicated by the first electric signal, and for generating and sending a control signal to the flow control means (88) to regulate the flow control means, characterised in that the flow control means comprises an adjustable valve having an orifice (94), a valve body (90) cooperating with the orifice (94), a cam follower (102) engaging the valve body (90)n a stepper motor (108) having a rotary shaft (106), and an asymmetric cam (104) mounted on the rotary shaft (106) to coact with the cam follower (102), the stepper motor (108) being controlled by control signal to control the flow rate.
Claim 2
Dependent Claim
273 words
A ventilator system for providing artificial ventilation to a patient, the system comprising a pessure regulated source (44) of respiratory gas, conduit means to be coupled to the patient flow control means (88) for controlling the flow of the respiratory gas to the conduit means in accordance with a predetermined flow rate-versus-time function; means (18) for measuring the flow rate of the respiratory gas downstream of the flow control means (88) and for generating a first electric signal indicative of said flow rate; exhalation valve means (164) for controlling the discharge from the conduit means of the respiratory gas and the exhaled gas from the patient; pressure control means (80) operatively connected with the exhalation valve means (164) for controlling the exhalation valve means (164) to maintain the pressure in the conduit means in accordance with a predetermined pressure-versus-time function; and computer means (38) for receiving the first electric signal, for providing the predetermined pressure-versus-time function, for comparing the value required by the predetermined flow rate-versus-time function with the instantaneous flow rate as indicated by the first electric signal, and for generating and sending a control signal to the flow control means (88) to regulate the flow control means, characterised in that the flow control means comprises an adjustable valve having an orifice (94), a valve body (90) cooperating with the orifice (94), a cam follower (102) engaging the valve body (90)n a stepper motor (108) having a rotary shaft (106), and an asymmetric cam (104) mounted on the rotary shaft (106) to coact with the cam follower (102), the stepper motor (108) being controlled by control signal to control the flow rate.
Claim 3
Dependent Claim
44 words
A system according to Claim 1 characterised by optical means (112) for sensing the position of the shaft (106) of the stepper motor (108), for generating an electric signal corresponding to said position and for sending said electric signal to the computer means (38).
Claim 4
Dependent Claim
78 words
A system according to Claim 1 or to Claim 2 characterised in that the valve body (90) has a first extreme position relative to the orifice (94) corresponding to maximum flow rate of the respiratory gas, and a second extreme position corresponding to a minimum flow rate of the respiratory gas, the rotary shaft (106) having two corresponding extreme positions, and wherein the optical sensing means (112) are adapted for sensing the two extreme positions of the shaft.
Claim 5
Dependent Claim
57 words
A system according to Claim 3 characterised in that the optical sensing means (112) includes an optically opaque element (222) which rotates together with the shaft means (224, 226) for generating and detecting two light beams, each of the two light beams being interrupted by said optically opaque element in each respective extreme position of the shaft.
Claim 6
Dependent Claim
60 words
A system according to Claim 4 characterised in that the computer means (38) is adapted to sensing the first and second extreme positions of the valve body from the signals sent by the optical means (112), and wherein the control signal to be sent to the stepper motor (108) is generated relative to said extreme positions of the shaft (106).
Claim 7
Independent Claim
45 words
A system according to any one of Claims 1 to 5 characterised by means (116) disposed between the flow control means (88) and the flow rate sensing and transducing means (118), for substantially eliminating sonic noise and turbulence in the flow of the respiratory gases.
References Cited (Backward Citations)
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