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US 4,729,378 AGranted
Apparatus for ascertaining the pressure in a plenum chamber
AssigneeInterzeag AG
InventorJean Trittenbass
Life of this patent
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AssigneeInterzeag AG
InventorJean Trittenbass
Estimating the term…
A tonometer which is used to measure the tension of eyeballs has a first testing device with a first outwardly bulging deformable wall which can be pressed against the eyeball (either directly or by way of the eyelid) and a second flexible wall which is deformable by the flexible or rigid wall member of a second testing device. The housing of the first testing device is filled with a gaseous or liquid fluid whose pressure is monitored by one or more gauges or risers, and a further instrument is provided on or in the second testing device to indicate the position of the wall member. The scale of the further instrument is calibrated in units of pressure in such a way that the tension of the eyeball can be read directly off the scale when the gauges or risers indicate that the deforming work upon one of the flexible walls is the same as that upon the other flexible wall.
Apparatus for ascertaining the pressure in a plenum chamber which has a flexible portion, such as a tonometer for measuring the tension of an eyeball, comprising a first testing device including a housing having an internal space and comprising first and second mobile walls having outer sides and inner sides, said device further including means provided in said internal space for yieldably biasing the inner sides of said walls to counteract forces which are applied to said outer sides including a force which is applied to the outer side of said first wall when said first wall is pressured against the flexible portion of a plenum chamber, and said first device also including means for indication the magnitude of forces which act upon the inner sides of said walls;
Apparatus for ascertaining the pressure in a plenum chamber which has a flexible portion, such as a tonometer for measuring the tension of an eyeball, comprising a first testing device including a housing having an internal space and comprising first and second mobile walls having outer sides and inner sides, said device further including means provided in said internal space for yieldably biasing the inner sides of said walls to counteract forces which are applied to said outer sides including a force which is applied to the outer side of said first wall when said first wall is pressed against the flexible portion of a plenum chamber, and said biasing means comprising a mechanical spring;
Apparatus for ascertaining the pressure in a plenum chamber which has a flexible portion, such as a tonometer for measuring the tension of an eyeball, comprising a first testing device including a housing having an internal space and comprising first and second mobile walls having outer sides and inner sides, said device further including means provided in said internal space for yieldably biasing the inner sides of said walls to counteract forces which are applied to said outer sides including a force which is applied to the outer side of said first wall when said first wall is pressed against the flexible portion of a plenum chamber, and said biasing means comprising of a fluid-operated spring;
Apparatus for ascertaining the pressure in a plenum chamber which has a flexible portion, such as a tonometer for measuring the tension of an eyeball, comprising a first testing device including a housing having a internal space and comprising first and second mobile walls having outer sides and inner sides, said device further including means provided in said internal space for yieldably biasing the inner sides of said walls to counteract forces which are applied to said outer sides including a force which is applied to the outer side of said first wall when said first wall is pressed against the flexible portion of a plenum chamber;
Apparatus for ascertaining the pressure in a plenum chamber which has a flexible portion, such as a tonometer for measuring the tension of an eyeball, comprising a first testing device including a housing having an internal space and comprising first and second mobile walls having outer sides and inner sides, said device further including means provided in said internal space for yieldably biasing the inner sides of said walls to counteract forces which are applied to said outer sides including a force which is applied to the outer side of said first wall when said first wall is pressed against the flexible portion of a plenum chamber;
Apparatus for ascertaining the pressure in a plenum chamber which has a flexible portion, such as a tonometer for measuring the tension of an eyeball, comprising a first testing device including a housing having an internal space and comprising first and second mobile walls having outer sides and inner sides, said device further including means provided in said internal space for yieldably biasing the inner sides of said walls to counteract forces which are applied to said outer sides including a force which is applied to the outer side of said first wall when said first wall is pressed against the flexible portion of a plenum chamber, and said internal space having a first fluid-filled part adjacent to the inner side of said first wall and a second fluid-filled part adjacent to the inner side of said second wall, said first device also comprising means for indicating the magnitude of forces acting upon the inner sides of said walls including first and second risers communciating with said first and second parts, respectively;
Apparatus for ascertaining the pressure in a plenum chamber which has a flexible portion, such as a tonometer for measuring the tension of an eyeball, comprising a first testing device including a housing having an internal space and comprising first and second mobile walls having outer sides and inner sides, said device further including means provided in said internal space for yieldably biasing the inner sides of said walls to counteract forces which are applied to said outer sides including a force which is applied to the outer side of said first wall when said first wall is pressed against the flexible portion of a plenum chamber, and said biasing means comprising a spring which bears against the inner sides of said walls, said first device also comprising means for indicating the bias of said spring;
Apparatus for ascertaining the pressure in plenum chamber which has a flexible portion, such as a tonometer for measuring the tension of an eyeball, comprising a first testing device including a housing having an internal space and comprising first and second mobile walls having outer sides and inner sides, said device further including means provided in said internal space for yieldably biasing the inner sides of said walls to counteract forces which are applied to said outer sides including a force which is applied to the outer side of said first wall when said first wall is pressed against the flexible portion of a plenum chamber;
Dependencies are inferred from the claim text.