Pressure control systems
First Claim
1. An inflatable cuff system for a tracheal or endotracheal tube or the like, comprising:
- (a) an inflatable cuff,(b) an inflation passage communicating with said cuff by means of which the cuff may be inflated by an inflating medium,(c) a pressure releasing first valve and a pressure releasing second valve arranged in series with one another in the inflation passage for regulating the flow of inflating medium through the inflation passage,(d) said first and second valves being spaced from one another to provide a reservoir for inflating medium therebetween,(e) said first valve being located between said cuff and said reservoir and being set to open to permit inflating medium to escape from said cuff into said reservoir when the pressure in the cuff rises above a predetermined first pressure,(f) said second valve being located outwardly from said reservoir in relation to the cuff and being set to open to permit inflating medium to escape from said reservoir when the pressure in the reservoir rises above a predetermined second pressure which is greater than said first pressure whereby at least a portion of the inflating medium displaced from the cuff into the reservoir may be retained in the reservoir at a pressure up to said second pressure and may be returned to said cuff when the pressure in the cuff drops below the pressure in the reservoir.
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Accused Products
Abstract
A pneumatically controlled pressure relief valve and various systems incorporating a pneumatically controlled pressure relief valve. The valve has a flexible valve closure member which is expandable to close a through passage of the valve and includes a pressure chamber disposed externally of the valve passage and isolated from the through passage by the flexible valve closure member so that the valve may open and close in response to the differential between the pressure in the pressure chamber and the pressure in the through passage of the valve. An input passage opens into the pressure chamber for admitting air and a manually operable valve is provided for opening and closing the input passage to regulate the admission of air. The systems incorporating the valve include an inflatable cuff system for a tracheal or endotracheal tube, a positive end expiratory pressure system and a suction system incorporating a suction catheter.
84 Citations
4 Claims
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1. An inflatable cuff system for a tracheal or endotracheal tube or the like, comprising:
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(a) an inflatable cuff, (b) an inflation passage communicating with said cuff by means of which the cuff may be inflated by an inflating medium, (c) a pressure releasing first valve and a pressure releasing second valve arranged in series with one another in the inflation passage for regulating the flow of inflating medium through the inflation passage, (d) said first and second valves being spaced from one another to provide a reservoir for inflating medium therebetween, (e) said first valve being located between said cuff and said reservoir and being set to open to permit inflating medium to escape from said cuff into said reservoir when the pressure in the cuff rises above a predetermined first pressure, (f) said second valve being located outwardly from said reservoir in relation to the cuff and being set to open to permit inflating medium to escape from said reservoir when the pressure in the reservoir rises above a predetermined second pressure which is greater than said first pressure whereby at least a portion of the inflating medium displaced from the cuff into the reservoir may be retained in the reservoir at a pressure up to said second pressure and may be returned to said cuff when the pressure in the cuff drops below the pressure in the reservoir. - View Dependent Claims (2, 3, 4)
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Specification